| //------------------------------------------------------------------------------------------------------- |
| // Copyright (C) Microsoft. All rights reserved. |
| // Licensed under the MIT license. See LICENSE.txt file in the project root for full license information. |
| //------------------------------------------------------------------------------------------------------- |
| #include "RuntimeByteCodePch.h" |
| #include "FormalsUtil.h" |
| #include "Language/AsmJs.h" |
| |
| void EmitReference(ParseNode *pnode, ByteCodeGenerator *byteCodeGenerator, FuncInfo *funcInfo); |
| void EmitAssignment(ParseNode *asgnNode, ParseNode *lhs, Js::RegSlot rhsLocation, ByteCodeGenerator *byteCodeGenerator, FuncInfo *funcInfo); |
| void EmitLoad(ParseNode *rhs, ByteCodeGenerator *byteCodeGenerator, FuncInfo *funcInfo); |
| void EmitCall(ParseNode* pnode, Js::RegSlot rhsLocation, ByteCodeGenerator* byteCodeGenerator, FuncInfo* funcInfo, BOOL fReturnValue, BOOL fEvaluateComponents, BOOL fHasNewTarget, Js::RegSlot overrideThisLocation = Js::Constants::NoRegister); |
| void EmitSuperFieldPatch(FuncInfo* funcInfo, ParseNode* pnode, ByteCodeGenerator* byteCodeGenerator); |
| |
| void EmitUseBeforeDeclaration(Symbol *sym, ByteCodeGenerator *byteCodeGenerator, FuncInfo *funcInfo); |
| void EmitUseBeforeDeclarationRuntimeError(ByteCodeGenerator *byteCodeGenerator, Js::RegSlot location); |
| void VisitClearTmpRegs(ParseNode * pnode, ByteCodeGenerator * byteCodeGenerator, FuncInfo * funcInfo); |
| |
| bool CallTargetIsArray(ParseNode *pnode) |
| { |
| return pnode->nop == knopName && pnode->sxPid.PropertyIdFromNameNode() == Js::PropertyIds::Array; |
| } |
| |
| #define STARTSTATEMENET_IFTOPLEVEL(isTopLevel, pnode) \ |
| if ((isTopLevel)) \ |
| { \ |
| byteCodeGenerator->StartStatement(pnode); \ |
| } |
| |
| #define ENDSTATEMENET_IFTOPLEVEL(isTopLevel, pnode) \ |
| if ((isTopLevel)) \ |
| { \ |
| byteCodeGenerator->EndStatement(pnode); \ |
| } |
| |
| BOOL MayHaveSideEffectOnNode(ParseNode *pnode, ParseNode *pnodeSE) |
| { |
| // Try to determine whether pnodeSE may kill the named var represented by pnode. |
| |
| if (pnode->nop == knopComputedName) |
| { |
| pnode = pnode->sxUni.pnode1; |
| } |
| |
| if (pnode->nop != knopName) |
| { |
| // Only investigating named vars here. |
| return false; |
| } |
| |
| uint fnop = ParseNode::Grfnop(pnodeSE->nop); |
| if (fnop & fnopLeaf) |
| { |
| // pnodeSE is a leaf and can't kill anything. |
| return false; |
| } |
| |
| if (fnop & fnopAsg) |
| { |
| // pnodeSE is an assignment (=, ++, +=, etc.) |
| // Trying to examine the LHS of pnodeSE caused small perf regressions, |
| // maybe because of code layout or some other subtle effect. |
| return true; |
| } |
| |
| if (fnop & fnopUni) |
| { |
| // pnodeSE is a unary op, so recurse to the source (if present - e.g., [] may have no opnd). |
| if (pnodeSE->nop == knopTempRef) |
| { |
| return false; |
| } |
| else |
| { |
| return pnodeSE->sxUni.pnode1 && MayHaveSideEffectOnNode(pnode, pnodeSE->sxUni.pnode1); |
| } |
| } |
| else if (fnop & fnopBin) |
| { |
| // pnodeSE is a binary (or ternary) op, so recurse to the sources (if present). |
| if (pnodeSE->nop == knopQmark) |
| { |
| return MayHaveSideEffectOnNode(pnode, pnodeSE->sxTri.pnode1) || |
| MayHaveSideEffectOnNode(pnode, pnodeSE->sxTri.pnode2) || |
| MayHaveSideEffectOnNode(pnode, pnodeSE->sxTri.pnode3); |
| } |
| else if (pnodeSE->nop == knopCall || pnodeSE->nop == knopNew) |
| { |
| return MayHaveSideEffectOnNode(pnode, pnodeSE->sxCall.pnodeTarget) || |
| (pnodeSE->sxCall.pnodeArgs && MayHaveSideEffectOnNode(pnode, pnodeSE->sxCall.pnodeArgs)); |
| } |
| else |
| { |
| return MayHaveSideEffectOnNode(pnode, pnodeSE->sxBin.pnode1) || |
| (pnodeSE->sxBin.pnode2 && MayHaveSideEffectOnNode(pnode, pnodeSE->sxBin.pnode2)); |
| } |
| } |
| else if (pnodeSE->nop == knopList) |
| { |
| return true; |
| } |
| |
| return false; |
| } |
| |
| bool IsCallOfConstants(ParseNode *pnode); |
| bool BlockHasOwnScope(ParseNode* pnodeBlock, ByteCodeGenerator *byteCodeGenerator); |
| bool CreateNativeArrays(ByteCodeGenerator *byteCodeGenerator, FuncInfo *funcInfo); |
| |
| bool IsArguments(ParseNode *pnode) |
| { |
| for (;;) |
| { |
| switch (pnode->nop) |
| { |
| case knopName: |
| return pnode->sxPid.sym && pnode->sxPid.sym->GetIsArguments(); |
| |
| case knopCall: |
| case knopNew: |
| if (IsArguments(pnode->sxCall.pnodeTarget)) |
| { |
| return true; |
| } |
| |
| if (pnode->sxCall.pnodeArgs) |
| { |
| ParseNode *pnodeArg = pnode->sxCall.pnodeArgs; |
| while (pnodeArg->nop == knopList) |
| { |
| if (IsArguments(pnodeArg->sxBin.pnode1)) |
| return true; |
| |
| pnodeArg = pnodeArg->sxBin.pnode2; |
| } |
| |
| pnode = pnodeArg; |
| break; |
| } |
| |
| return false; |
| |
| case knopArray: |
| if (pnode->sxArrLit.arrayOfNumbers || pnode->sxArrLit.count == 0) |
| { |
| return false; |
| } |
| |
| pnode = pnode->sxUni.pnode1; |
| break; |
| |
| case knopQmark: |
| if (IsArguments(pnode->sxTri.pnode1) || IsArguments(pnode->sxTri.pnode2)) |
| { |
| return true; |
| } |
| |
| pnode = pnode->sxTri.pnode3; |
| break; |
| |
| // |
| // Cases where we don't check for "arguments" yet. |
| // Assume that they might have it. Disable the optimization is such scenarios |
| // |
| case knopList: |
| case knopObject: |
| case knopVarDecl: |
| case knopConstDecl: |
| case knopLetDecl: |
| case knopFncDecl: |
| case knopClassDecl: |
| case knopFor: |
| case knopIf: |
| case knopDoWhile: |
| case knopWhile: |
| case knopForIn: |
| case knopForOf: |
| case knopReturn: |
| case knopBlock: |
| case knopBreak: |
| case knopContinue: |
| case knopLabel: |
| case knopTypeof: |
| case knopThrow: |
| case knopWith: |
| case knopFinally: |
| case knopTry: |
| case knopTryCatch: |
| case knopTryFinally: |
| case knopArrayPattern: |
| case knopObjectPattern: |
| case knopParamPattern: |
| return true; |
| |
| default: |
| { |
| uint flags = ParseNode::Grfnop(pnode->nop); |
| if (flags&fnopUni) |
| { |
| Assert(pnode->sxUni.pnode1); |
| |
| pnode = pnode->sxUni.pnode1; |
| break; |
| } |
| else if (flags&fnopBin) |
| { |
| Assert(pnode->sxBin.pnode1 && pnode->sxBin.pnode2); |
| |
| if (IsArguments(pnode->sxBin.pnode1)) |
| { |
| return true; |
| } |
| |
| pnode = pnode->sxBin.pnode2; |
| break; |
| } |
| |
| return false; |
| } |
| |
| } |
| } |
| } |
| |
| bool ApplyEnclosesArgs(ParseNode* fncDecl, ByteCodeGenerator* byteCodeGenerator); |
| void Emit(ParseNode *pnode, ByteCodeGenerator *byteCodeGenerator, FuncInfo *funcInfo, BOOL fReturnValue, bool isConstructorCall = false, ParseNode *bindPnode = nullptr, bool isTopLevel = false); |
| void EmitComputedFunctionNameVar(ParseNode *nameNode, ParseNode *exprNode, ByteCodeGenerator *byteCodeGenerator); |
| void EmitBinaryOpnds(ParseNode *pnode1, ParseNode *pnode2, ByteCodeGenerator *byteCodeGenerator, FuncInfo *funcInfo); |
| bool IsExpressionStatement(ParseNode* stmt, const Js::ScriptContext *const scriptContext); |
| void EmitInvoke(Js::RegSlot location, Js::RegSlot callObjLocation, Js::PropertyId propertyId, ByteCodeGenerator* byteCodeGenerator, FuncInfo* funcInfo); |
| void EmitInvoke(Js::RegSlot location, Js::RegSlot callObjLocation, Js::PropertyId propertyId, ByteCodeGenerator* byteCodeGenerator, FuncInfo* funcInfo, Js::RegSlot arg1Location); |
| |
| static const Js::OpCode nopToOp[knopLim] = |
| { |
| #define OP(x) Br##x##_A |
| #define PTNODE(nop,sn,pc,nk,grfnop,json) Js::OpCode::pc, |
| #include "ptlist.h" |
| }; |
| static const Js::OpCode nopToCMOp[knopLim] = |
| { |
| #define OP(x) Cm##x##_A |
| #define PTNODE(nop,sn,pc,nk,grfnop,json) Js::OpCode::pc, |
| #include "ptlist.h" |
| }; |
| |
| Js::OpCode ByteCodeGenerator::ToChkUndeclOp(Js::OpCode op) const |
| { |
| switch(op) |
| { |
| case Js::OpCode::StLocalSlot: |
| return Js::OpCode::StLocalSlotChkUndecl; |
| |
| case Js::OpCode::StInnerSlot: |
| return Js::OpCode::StInnerSlotChkUndecl; |
| |
| case Js::OpCode::StEnvSlot: |
| return Js::OpCode::StEnvSlotChkUndecl; |
| |
| case Js::OpCode::StObjSlot: |
| return Js::OpCode::StObjSlotChkUndecl; |
| |
| case Js::OpCode::StLocalObjSlot: |
| return Js::OpCode::StLocalObjSlotChkUndecl; |
| |
| case Js::OpCode::StInnerObjSlot: |
| return Js::OpCode::StInnerObjSlotChkUndecl; |
| |
| case Js::OpCode::StEnvObjSlot: |
| return Js::OpCode::StEnvObjSlotChkUndecl; |
| |
| default: |
| AssertMsg(false, "Unknown opcode for chk undecl mapping"); |
| return Js::OpCode::InvalidOpCode; |
| } |
| } |
| |
| // Tracks a register slot let/const property for the passed in debugger block/catch scope. |
| // debuggerScope - The scope to add the variable to. |
| // symbol - The symbol that represents the register property. |
| // funcInfo - The function info used to store the property into the tracked debugger register slot list. |
| // flags - The flags to assign to the property. |
| // isFunctionDeclaration - Whether or not the register is a function declaration, which requires that its byte code offset be updated immediately. |
| void ByteCodeGenerator::TrackRegisterPropertyForDebugger( |
| Js::DebuggerScope *debuggerScope, |
| Symbol *symbol, |
| FuncInfo *funcInfo, |
| Js::DebuggerScopePropertyFlags flags /*= Js::DebuggerScopePropertyFlags_None*/, |
| bool isFunctionDeclaration /*= false*/) |
| { |
| Assert(debuggerScope); |
| Assert(symbol); |
| Assert(funcInfo); |
| |
| Js::RegSlot location = symbol->GetLocation(); |
| |
| Js::DebuggerScope *correctDebuggerScope = debuggerScope; |
| if (debuggerScope->scopeType != Js::DiagExtraScopesType::DiagBlockScopeDirect && debuggerScope->scopeType != Js::DiagExtraScopesType::DiagCatchScopeDirect) |
| { |
| // We have to get the appropriate scope and add property over there. |
| // Make sure the scope is created whether we're in debug mode or not, because we |
| // need the empty scopes present during reparsing for debug mode. |
| correctDebuggerScope = debuggerScope->GetSiblingScope(location, Writer()->GetFunctionWrite()); |
| } |
| |
| if (this->ShouldTrackDebuggerMetadata() && !symbol->GetIsTrackedForDebugger()) |
| { |
| // Only track the property if we're in debug mode since it's only needed by the debugger. |
| Js::PropertyId propertyId = symbol->EnsurePosition(this); |
| |
| this->Writer()->AddPropertyToDebuggerScope( |
| correctDebuggerScope, |
| location, |
| propertyId, |
| /*shouldConsumeRegister*/ true, |
| flags, |
| isFunctionDeclaration); |
| |
| Js::FunctionBody *byteCodeFunction = funcInfo->GetParsedFunctionBody(); |
| byteCodeFunction->InsertSymbolToRegSlotList(location, propertyId, funcInfo->varRegsCount); |
| |
| symbol->SetIsTrackedForDebugger(true); |
| } |
| } |
| |
| void ByteCodeGenerator::TrackActivationObjectPropertyForDebugger( |
| Js::DebuggerScope *debuggerScope, |
| Symbol *symbol, |
| Js::DebuggerScopePropertyFlags flags /*= Js::DebuggerScopePropertyFlags_None*/, |
| bool isFunctionDeclaration /*= false*/) |
| { |
| Assert(debuggerScope); |
| Assert(symbol); |
| |
| // Only need to track activation object properties in debug mode. |
| if (ShouldTrackDebuggerMetadata() && !symbol->GetIsTrackedForDebugger()) |
| { |
| Js::RegSlot location = symbol->GetLocation(); |
| Js::PropertyId propertyId = symbol->EnsurePosition(this); |
| |
| this->Writer()->AddPropertyToDebuggerScope( |
| debuggerScope, |
| location, |
| propertyId, |
| /*shouldConsumeRegister*/ false, |
| flags, |
| isFunctionDeclaration); |
| |
| symbol->SetIsTrackedForDebugger(true); |
| } |
| } |
| |
| void ByteCodeGenerator::TrackSlotArrayPropertyForDebugger( |
| Js::DebuggerScope *debuggerScope, |
| Symbol* symbol, |
| Js::PropertyId propertyId, |
| Js::DebuggerScopePropertyFlags flags /*= Js::DebuggerScopePropertyFlags_None*/, |
| bool isFunctionDeclaration /*= false*/) |
| { |
| // Note: Slot array properties are tracked even in non-debug mode in order to support slot array serialization |
| // of let/const variables between non-debug and debug mode (for example, when a slot array var escapes and is retrieved |
| // after a debugger attach or for WWA apps). They are also needed for heap enumeration. |
| Assert(debuggerScope); |
| Assert(symbol); |
| |
| if (!symbol->GetIsTrackedForDebugger()) |
| { |
| Js::RegSlot location = symbol->GetScopeSlot(); |
| Assert(location != Js::Constants::NoRegister); |
| Assert(propertyId != Js::Constants::NoProperty); |
| |
| this->Writer()->AddPropertyToDebuggerScope( |
| debuggerScope, |
| location, |
| propertyId, |
| /*shouldConsumeRegister*/ false, |
| flags, |
| isFunctionDeclaration); |
| |
| symbol->SetIsTrackedForDebugger(true); |
| } |
| } |
| |
| // Tracks a function declaration inside a block scope for the debugger metadata's current scope (let binding). |
| void ByteCodeGenerator::TrackFunctionDeclarationPropertyForDebugger(Symbol *functionDeclarationSymbol, FuncInfo *funcInfoParent) |
| { |
| Assert(functionDeclarationSymbol); |
| Assert(funcInfoParent); |
| AssertMsg(functionDeclarationSymbol->GetIsBlockVar(), "We should only track inner function let bindings for the debugger."); |
| |
| // Note: we don't have to check symbol->GetIsTrackedForDebugger, as we are not doing actual work here, |
| // which is done in other Track* functions that we call. |
| |
| if (functionDeclarationSymbol->IsInSlot(funcInfoParent)) |
| { |
| if (functionDeclarationSymbol->GetScope()->GetIsObject()) |
| { |
| this->TrackActivationObjectPropertyForDebugger( |
| this->Writer()->GetCurrentDebuggerScope(), |
| functionDeclarationSymbol, |
| Js::DebuggerScopePropertyFlags_None, |
| true /*isFunctionDeclaration*/); |
| } |
| else |
| { |
| // Make sure the property has a slot. This will bump up the size of the slot array if necessary. |
| // Note that slot array inner function bindings are tracked even in non-debug mode in order |
| // to keep the lifetime of the closure binding that could escape around for heap enumeration. |
| functionDeclarationSymbol->EnsureScopeSlot(funcInfoParent); |
| functionDeclarationSymbol->EnsurePosition(this); |
| this->TrackSlotArrayPropertyForDebugger( |
| this->Writer()->GetCurrentDebuggerScope(), |
| functionDeclarationSymbol, |
| functionDeclarationSymbol->GetPosition(), |
| Js::DebuggerScopePropertyFlags_None, |
| true /*isFunctionDeclaration*/); |
| } |
| } |
| else |
| { |
| this->TrackRegisterPropertyForDebugger( |
| this->Writer()->GetCurrentDebuggerScope(), |
| functionDeclarationSymbol, |
| funcInfoParent, |
| Js::DebuggerScopePropertyFlags_None, |
| true /*isFunctionDeclaration*/); |
| } |
| } |
| |
| // Updates the byte code offset of the property with the passed in location and ID. |
| // Used to track let/const variables that are in the dead zone debugger side. |
| // location - The activation object, scope slot index, or register location for the property. |
| // propertyId - The ID of the property to update. |
| // shouldConsumeRegister - Whether or not the a register should be consumed (used for reg slot locations). |
| void ByteCodeGenerator::UpdateDebuggerPropertyInitializationOffset(Js::RegSlot location, Js::PropertyId propertyId, bool shouldConsumeRegister) |
| { |
| Assert(this->Writer()); |
| Js::DebuggerScope* currentDebuggerScope = this->Writer()->GetCurrentDebuggerScope(); |
| Assert(currentDebuggerScope); |
| if (currentDebuggerScope != nullptr) |
| { |
| this->Writer()->UpdateDebuggerPropertyInitializationOffset( |
| currentDebuggerScope, |
| location, |
| propertyId, |
| shouldConsumeRegister); |
| } |
| } |
| |
| void ByteCodeGenerator::LoadHeapArguments(FuncInfo *funcInfo) |
| { |
| if (funcInfo->GetHasCachedScope()) |
| { |
| this->LoadCachedHeapArguments(funcInfo); |
| } |
| else |
| { |
| this->LoadUncachedHeapArguments(funcInfo); |
| } |
| } |
| |
| void GetFormalArgsArray(ByteCodeGenerator *byteCodeGenerator, FuncInfo * funcInfo, Js::PropertyIdArray *propIds) |
| { |
| Assert(funcInfo); |
| Assert(propIds); |
| Assert(byteCodeGenerator); |
| |
| bool hadDuplicates = false; |
| Js::ArgSlot i = 0; |
| |
| auto processArg = [&](ParseNode *pnode) |
| { |
| if (pnode->IsVarLetOrConst()) |
| { |
| Assert(i < propIds->count); |
| Symbol *sym = pnode->sxVar.sym; |
| Assert(sym); |
| Js::PropertyId symPos = sym->EnsurePosition(byteCodeGenerator); |
| |
| // |
| // Check if the function has any same name parameters |
| // For the same name param, only the last one will be passed the correct propertyid |
| // For remaining dup param names, pass Constants::NoProperty |
| // |
| for (Js::ArgSlot j = 0; j < i; j++) |
| { |
| if (propIds->elements[j] == symPos) |
| { |
| // Found a dup parameter name |
| propIds->elements[j] = Js::Constants::NoProperty; |
| hadDuplicates = true; |
| break; |
| } |
| } |
| propIds->elements[i] = symPos; |
| } |
| else |
| { |
| propIds->elements[i] = Js::Constants::NoProperty; |
| } |
| ++i; |
| }; |
| MapFormals(funcInfo->root, processArg); |
| |
| propIds->hadDuplicates = hadDuplicates; |
| } |
| |
| void ByteCodeGenerator::LoadUncachedHeapArguments(FuncInfo *funcInfo) |
| { |
| Assert(funcInfo->GetHasHeapArguments()); |
| |
| Scope *scope = funcInfo->GetBodyScope(); |
| Assert(scope); |
| Symbol *argSym = funcInfo->GetArgumentsSymbol(); |
| Assert(argSym && argSym->GetIsArguments()); |
| Js::RegSlot argumentsLoc = argSym->GetLocation(); |
| Js::RegSlot propIdsLoc = funcInfo->nullConstantRegister; |
| |
| Js::OpCode opcode = !funcInfo->root->sxFnc.HasNonSimpleParameterList() ? Js::OpCode::LdHeapArguments : Js::OpCode::LdLetHeapArguments; |
| bool hasRest = funcInfo->root->sxFnc.pnodeRest != nullptr; |
| uint count = funcInfo->inArgsCount + (hasRest ? 1 : 0) - 1; |
| if (count == 0) |
| { |
| // If no formals to function (only "this"), then no need to create the scope object. |
| // Leave both the arguments location and the propertyIds location as null. |
| Assert(funcInfo->root->sxFnc.pnodeParams == nullptr && !hasRest); |
| } |
| else if (!NeedScopeObjectForArguments(funcInfo, funcInfo->root)) |
| { |
| // We may not need a scope object for arguments, e.g. strict mode with no eval. |
| } |
| else if (funcInfo->frameObjRegister != Js::Constants::NoRegister) |
| { |
| // Pass the frame object and ID array to the runtime, and put the resulting Arguments object |
| // at the expected location. |
| propIdsLoc = argumentsLoc; |
| |
| Js::PropertyIdArray *propIds = AnewPlus(GetAllocator(), count * sizeof(Js::PropertyId), Js::PropertyIdArray, count); |
| |
| GetFormalArgsArray(this, funcInfo, propIds); |
| |
| // Generate the opcode with propIds |
| Writer()->Auxiliary( |
| Js::OpCode::LdPropIds, |
| propIdsLoc, |
| propIds, |
| sizeof(Js::PropertyIdArray) + count * sizeof(Js::PropertyId), |
| count); |
| |
| AdeletePlus(GetAllocator(), count * sizeof(Js::PropertyId), propIds); |
| } |
| |
| this->m_writer.Reg2(opcode, argumentsLoc, propIdsLoc); |
| EmitLocalPropInit(argSym->GetLocation(), argSym, funcInfo); |
| } |
| |
| void ByteCodeGenerator::LoadCachedHeapArguments(FuncInfo *funcInfo) |
| { |
| Assert(funcInfo->GetHasHeapArguments()); |
| |
| Scope *scope = funcInfo->GetBodyScope(); |
| Assert(scope); |
| Symbol *argSym = funcInfo->GetArgumentsSymbol(); |
| Assert(argSym && argSym->GetIsArguments()); |
| Js::RegSlot argumentsLoc = argSym->GetLocation(); |
| |
| Js::OpCode op = !funcInfo->root->sxFnc.HasNonSimpleParameterList() ? Js::OpCode::LdHeapArgsCached : Js::OpCode::LdLetHeapArgsCached; |
| |
| this->m_writer.Reg1(op, argumentsLoc); |
| EmitLocalPropInit(argumentsLoc, argSym, funcInfo); |
| } |
| |
| Js::JavascriptArray* ByteCodeGenerator::BuildArrayFromStringList(ParseNode* stringNodeList, uint arrayLength, Js::ScriptContext* scriptContext) |
| { |
| Assert(stringNodeList); |
| |
| uint index = 0; |
| Js::Var str; |
| IdentPtr pid; |
| Js::JavascriptArray* pArr = scriptContext->GetLibrary()->CreateArray(arrayLength); |
| |
| while (stringNodeList->nop == knopList) |
| { |
| Assert(stringNodeList->sxBin.pnode1->nop == knopStr); |
| |
| pid = stringNodeList->sxBin.pnode1->sxPid.pid; |
| str = Js::JavascriptString::NewCopyBuffer(pid->Psz(), pid->Cch(), scriptContext); |
| pArr->SetItemWithAttributes(index, str, PropertyEnumerable); |
| |
| stringNodeList = stringNodeList->sxBin.pnode2; |
| index++; |
| } |
| |
| Assert(stringNodeList->nop == knopStr); |
| |
| pid = stringNodeList->sxPid.pid; |
| str = Js::JavascriptString::NewCopyBuffer(pid->Psz(), pid->Cch(), scriptContext); |
| pArr->SetItemWithAttributes(index, str, PropertyEnumerable); |
| |
| return pArr; |
| } |
| |
| // For now, this just assigns field ids for the current script. |
| // Later, we will combine this information with the global field id map. |
| // This temporary code will not work if a global member is accessed both with and without a LHS. |
| void ByteCodeGenerator::AssignPropertyIds(Js::ParseableFunctionInfo* functionInfo) |
| { |
| globalScope->ForEachSymbol([this, functionInfo](Symbol * sym) |
| { |
| this->AssignPropertyId(sym, functionInfo); |
| }); |
| } |
| |
| void ByteCodeGenerator::InitBlockScopedContent(ParseNode *pnodeBlock, Js::DebuggerScope* debuggerScope, FuncInfo *funcInfo) |
| { |
| Assert(pnodeBlock->nop == knopBlock); |
| |
| auto genBlockInit = [this, debuggerScope, funcInfo](ParseNode *pnode) |
| { |
| // Only check if the scope is valid when let/const vars are in the scope. If there are no let/const vars, |
| // the debugger scope will not be created. |
| AssertMsg(debuggerScope, "Missing a case of scope tracking in BeginEmitBlock."); |
| |
| FuncInfo *funcInfo = this->TopFuncInfo(); |
| Symbol *sym = pnode->sxVar.sym; |
| Scope *scope = sym->GetScope(); |
| |
| if (sym->GetIsGlobal()) |
| { |
| Js::PropertyId propertyId = sym->EnsurePosition(this); |
| if (this->flags & fscrEval) |
| { |
| AssertMsg(this->IsConsoleScopeEval(), "Let/Consts cannot be in global scope outside of console eval"); |
| Js::OpCode op = (sym->GetDecl()->nop == knopConstDecl) ? Js::OpCode::InitUndeclConsoleConstFld : Js::OpCode::InitUndeclConsoleLetFld; |
| this->m_writer.ElementScopedU(op, funcInfo->FindOrAddReferencedPropertyId(propertyId)); |
| } |
| else if (!sym->GetIsModuleExportStorage()) |
| { |
| Js::OpCode op = (sym->GetDecl()->nop == knopConstDecl) ? |
| Js::OpCode::InitUndeclRootConstFld : Js::OpCode::InitUndeclRootLetFld; |
| this->m_writer.ElementRootU(op, funcInfo->FindOrAddReferencedPropertyId(propertyId)); |
| } |
| } |
| else if (sym->IsInSlot(funcInfo) || (scope->GetIsObject() && sym->NeedsSlotAlloc(funcInfo))) |
| { |
| if (scope->GetIsObject()) |
| { |
| Js::RegSlot scopeLocation = scope->GetLocation(); |
| Js::PropertyId propertyId = sym->EnsurePosition(this); |
| |
| if (scopeLocation != Js::Constants::NoRegister && scopeLocation == funcInfo->frameObjRegister) |
| { |
| uint cacheId = funcInfo->FindOrAddInlineCacheId(scopeLocation, propertyId, false, true); |
| |
| Js::OpCode op = (sym->GetDecl()->nop == knopConstDecl) ? |
| Js::OpCode::InitUndeclLocalConstFld : Js::OpCode::InitUndeclLocalLetFld; |
| |
| this->m_writer.ElementP(op, ByteCodeGenerator::ReturnRegister, cacheId); |
| } |
| else |
| { |
| uint cacheId = funcInfo->FindOrAddInlineCacheId(funcInfo->InnerScopeToRegSlot(scope), propertyId, false, true); |
| |
| Js::OpCode op = (sym->GetDecl()->nop == knopConstDecl) ? |
| Js::OpCode::InitUndeclConstFld : Js::OpCode::InitUndeclLetFld; |
| |
| this->m_writer.ElementPIndexed(op, ByteCodeGenerator::ReturnRegister, scope->GetInnerScopeIndex(), cacheId); |
| } |
| |
| TrackActivationObjectPropertyForDebugger(debuggerScope, sym, pnode->nop == knopConstDecl ? Js::DebuggerScopePropertyFlags_Const : Js::DebuggerScopePropertyFlags_None); |
| } |
| else |
| { |
| Js::RegSlot tmpReg = funcInfo->AcquireTmpRegister(); |
| this->m_writer.Reg1(Js::OpCode::InitUndecl, tmpReg); |
| this->EmitLocalPropInit(tmpReg, sym, funcInfo); |
| funcInfo->ReleaseTmpRegister(tmpReg); |
| |
| // Slot array properties are tracked in non-debug mode as well because they need to stay |
| // around for heap enumeration and escaping during attach/detach. |
| TrackSlotArrayPropertyForDebugger(debuggerScope, sym, sym->EnsurePosition(this), pnode->nop == knopConstDecl ? Js::DebuggerScopePropertyFlags_Const : Js::DebuggerScopePropertyFlags_None); |
| } |
| } |
| else |
| { |
| if (sym->GetDecl()->sxVar.isSwitchStmtDecl) |
| { |
| // let/const declared in a switch is the only case of a variable that must be checked for |
| // use-before-declaration dynamically within its own function. |
| this->m_writer.Reg1(Js::OpCode::InitUndecl, sym->GetLocation()); |
| } |
| // Syms that begin in register may be delay-captured. In debugger mode, such syms |
| // will live only in slots, so tell the debugger to find them there. |
| if (sym->NeedsSlotAlloc(funcInfo)) |
| { |
| TrackSlotArrayPropertyForDebugger(debuggerScope, sym, sym->EnsurePosition(this), pnode->nop == knopConstDecl ? Js::DebuggerScopePropertyFlags_Const : Js::DebuggerScopePropertyFlags_None); |
| } |
| else |
| { |
| TrackRegisterPropertyForDebugger(debuggerScope, sym, funcInfo, pnode->nop == knopConstDecl ? Js::DebuggerScopePropertyFlags_Const : Js::DebuggerScopePropertyFlags_None); |
| } |
| } |
| }; |
| |
| IterateBlockScopedVariables(pnodeBlock, genBlockInit); |
| } |
| |
| // Records the start of a debugger scope if the passed in node has any let/const variables (or is not a block node). |
| // If it has no let/const variables, nullptr will be returned as no scope will be created. |
| Js::DebuggerScope* ByteCodeGenerator::RecordStartScopeObject(ParseNode *pnodeBlock, Js::DiagExtraScopesType scopeType, Js::RegSlot scopeLocation /*= Js::Constants::NoRegister*/, int* index /*= nullptr*/) |
| { |
| Assert(pnodeBlock); |
| if (pnodeBlock->nop == knopBlock && !pnodeBlock->sxBlock.HasBlockScopedContent()) |
| { |
| // In order to reduce allocations now that we track debugger scopes in non-debug mode, |
| // don't add a block to the chain if it has no let/const variables at all. |
| return nullptr; |
| } |
| |
| return this->Writer()->RecordStartScopeObject(scopeType, scopeLocation, index); |
| } |
| |
| // Records the end of the current scope, but only if the current block has block scoped content. |
| // Otherwise, a scope would not have been added (see ByteCodeGenerator::RecordStartScopeObject()). |
| void ByteCodeGenerator::RecordEndScopeObject(ParseNode *pnodeBlock) |
| { |
| Assert(pnodeBlock); |
| if (pnodeBlock->nop == knopBlock && !pnodeBlock->sxBlock.HasBlockScopedContent()) |
| { |
| return; |
| } |
| |
| this->Writer()->RecordEndScopeObject(); |
| } |
| |
| void BeginEmitBlock(ParseNode *pnodeBlock, ByteCodeGenerator *byteCodeGenerator, FuncInfo *funcInfo) |
| { |
| Js::DebuggerScope* debuggerScope = nullptr; |
| |
| if (BlockHasOwnScope(pnodeBlock, byteCodeGenerator)) |
| { |
| Scope *scope = pnodeBlock->sxBlock.scope; |
| byteCodeGenerator->PushScope(scope); |
| |
| Js::RegSlot scopeLocation = scope->GetLocation(); |
| if (scope->GetMustInstantiate()) |
| { |
| Assert(scopeLocation == Js::Constants::NoRegister); |
| scopeLocation = funcInfo->FirstInnerScopeReg() + scope->GetInnerScopeIndex(); |
| |
| if (scope->GetIsObject()) |
| { |
| debuggerScope = byteCodeGenerator->RecordStartScopeObject(pnodeBlock, Js::DiagExtraScopesType::DiagBlockScopeInObject, scopeLocation); |
| |
| byteCodeGenerator->Writer()->Unsigned1(Js::OpCode::NewBlockScope, scope->GetInnerScopeIndex()); |
| } |
| else |
| { |
| int scopeIndex = Js::DebuggerScope::InvalidScopeIndex; |
| debuggerScope = byteCodeGenerator->RecordStartScopeObject(pnodeBlock, Js::DiagExtraScopesType::DiagBlockScopeInSlot, scopeLocation, &scopeIndex); |
| |
| // TODO: Handle heap enumeration |
| int scopeSlotCount = scope->GetScopeSlotCount(); |
| byteCodeGenerator->Writer()->Num3(Js::OpCode::NewInnerScopeSlots, scope->GetInnerScopeIndex(), scopeSlotCount + Js::ScopeSlots::FirstSlotIndex, scopeIndex); |
| } |
| } |
| else |
| { |
| // In the direct register access case, there is no block scope emitted but we can still track |
| // the start and end offset of the block. The location registers for let/const variables will still be |
| // captured along with this range in InitBlockScopedContent(). |
| debuggerScope = byteCodeGenerator->RecordStartScopeObject(pnodeBlock, Js::DiagExtraScopesType::DiagBlockScopeDirect); |
| } |
| |
| bool const isGlobalEvalBlockScope = scope->IsGlobalEvalBlockScope(); |
| Js::RegSlot frameDisplayLoc = Js::Constants::NoRegister; |
| Js::RegSlot tmpInnerEnvReg = Js::Constants::NoRegister; |
| ParseNodePtr pnodeScope; |
| for (pnodeScope = pnodeBlock->sxBlock.pnodeScopes; pnodeScope;) |
| { |
| switch (pnodeScope->nop) |
| { |
| case knopFncDecl: |
| if (pnodeScope->sxFnc.IsDeclaration()) |
| { |
| // The frameDisplayLoc register's lifetime has to be controlled by this function. We can't let |
| // it be released by DefineOneFunction, because further iterations of this loop can allocate |
| // temps, and we can't let frameDisplayLoc be re-purposed until this loop completes. |
| // So we'll supply a temp that we allocate and release here. |
| if (frameDisplayLoc == Js::Constants::NoRegister) |
| { |
| if (funcInfo->frameDisplayRegister != Js::Constants::NoRegister) |
| { |
| frameDisplayLoc = funcInfo->frameDisplayRegister; |
| } |
| else |
| { |
| frameDisplayLoc = funcInfo->GetEnvRegister(); |
| } |
| tmpInnerEnvReg = funcInfo->AcquireTmpRegister(); |
| frameDisplayLoc = byteCodeGenerator->PrependLocalScopes(frameDisplayLoc, tmpInnerEnvReg, funcInfo); |
| } |
| byteCodeGenerator->DefineOneFunction(pnodeScope, funcInfo, true, frameDisplayLoc); |
| } |
| |
| // If this is the global eval block scope, the function is actually assigned to the global |
| // so we don't need to keep the registers. |
| if (isGlobalEvalBlockScope) |
| { |
| funcInfo->ReleaseLoc(pnodeScope); |
| pnodeScope->location = Js::Constants::NoRegister; |
| } |
| pnodeScope = pnodeScope->sxFnc.pnodeNext; |
| break; |
| |
| case knopBlock: |
| pnodeScope = pnodeScope->sxBlock.pnodeNext; |
| break; |
| |
| case knopCatch: |
| pnodeScope = pnodeScope->sxCatch.pnodeNext; |
| break; |
| |
| case knopWith: |
| pnodeScope = pnodeScope->sxWith.pnodeNext; |
| break; |
| } |
| } |
| |
| if (tmpInnerEnvReg != Js::Constants::NoRegister) |
| { |
| funcInfo->ReleaseTmpRegister(tmpInnerEnvReg); |
| } |
| |
| if (pnodeBlock->sxBlock.scope->IsGlobalEvalBlockScope() && funcInfo->thisScopeSlot != Js::Constants::NoRegister) |
| { |
| Scope* scope = funcInfo->GetGlobalEvalBlockScope(); |
| byteCodeGenerator->EmitInitCapturedThis(funcInfo, scope); |
| } |
| } |
| else |
| { |
| Scope *scope = pnodeBlock->sxBlock.scope; |
| if (scope) |
| { |
| if (scope->GetMustInstantiate()) |
| { |
| debuggerScope = byteCodeGenerator->RecordStartScopeObject(pnodeBlock, Js::DiagExtraScopesType::DiagBlockScopeInObject); |
| } |
| else |
| { |
| debuggerScope = byteCodeGenerator->RecordStartScopeObject(pnodeBlock, Js::DiagExtraScopesType::DiagBlockScopeDirect); |
| } |
| } |
| else |
| { |
| debuggerScope = byteCodeGenerator->RecordStartScopeObject(pnodeBlock, Js::DiagExtraScopesType::DiagBlockScopeInSlot); |
| } |
| } |
| |
| byteCodeGenerator->InitBlockScopedContent(pnodeBlock, debuggerScope, funcInfo); |
| } |
| |
| void EndEmitBlock(ParseNode *pnodeBlock, ByteCodeGenerator *byteCodeGenerator, FuncInfo *funcInfo) |
| { |
| if (BlockHasOwnScope(pnodeBlock, byteCodeGenerator)) |
| { |
| Scope *scope = pnodeBlock->sxBlock.scope; |
| Assert(scope); |
| Assert(scope == byteCodeGenerator->GetCurrentScope()); |
| byteCodeGenerator->PopScope(); |
| } |
| |
| byteCodeGenerator->RecordEndScopeObject(pnodeBlock); |
| } |
| |
| void CloneEmitBlock(ParseNode *pnodeBlock, ByteCodeGenerator *byteCodeGenerator, FuncInfo *funcInfo) |
| { |
| if (BlockHasOwnScope(pnodeBlock, byteCodeGenerator)) |
| { |
| // Only let variables have observable behavior when there are per iteration |
| // bindings. const variables do not since they are immutable. Therefore, |
| // (and the spec agrees), only create new scope clones if the loop variable |
| // is a let declaration. |
| bool isConst = false; |
| pnodeBlock->sxBlock.scope->ForEachSymbolUntil([&isConst](Symbol * const sym) { |
| // Exploit the fact that a for loop sxBlock can only have let and const |
| // declarations, and can only have one or the other, regardless of how |
| // many syms there might be. Thus only check the first sym. |
| isConst = sym->GetDecl()->nop == knopConstDecl; |
| return true; |
| }); |
| |
| if (!isConst) |
| { |
| Scope *scope = pnodeBlock->sxBlock.scope; |
| Assert(scope == byteCodeGenerator->GetCurrentScope()); |
| |
| if (scope->GetMustInstantiate()) |
| { |
| Js::OpCode op = scope->GetIsObject() ? Js::OpCode::CloneBlockScope : Js::OpCode::CloneInnerScopeSlots; |
| |
| byteCodeGenerator->Writer()->Unsigned1(op, scope->GetInnerScopeIndex()); |
| } |
| } |
| } |
| } |
| |
| void EmitBlock(ParseNode *pnodeBlock, ByteCodeGenerator *byteCodeGenerator, FuncInfo *funcInfo, BOOL fReturnValue) |
| { |
| Assert(pnodeBlock->nop == knopBlock); |
| ParseNode *pnode = pnodeBlock->sxBlock.pnodeStmt; |
| if (pnode == nullptr) |
| { |
| return; |
| } |
| |
| BeginEmitBlock(pnodeBlock, byteCodeGenerator, funcInfo); |
| |
| ParseNode *pnodeLastValStmt = pnodeBlock->sxBlock.pnodeLastValStmt; |
| |
| while (pnode->nop == knopList) |
| { |
| ParseNode* stmt = pnode->sxBin.pnode1; |
| if (stmt == pnodeLastValStmt) |
| { |
| // This is the last guaranteed return value, so any potential return values have to be |
| // copied to the return register from this point forward. |
| pnodeLastValStmt = nullptr; |
| } |
| byteCodeGenerator->EmitTopLevelStatement(stmt, funcInfo, fReturnValue && (pnodeLastValStmt == nullptr)); |
| pnode = pnode->sxBin.pnode2; |
| } |
| |
| if (pnode == pnodeLastValStmt) |
| { |
| pnodeLastValStmt = nullptr; |
| } |
| byteCodeGenerator->EmitTopLevelStatement(pnode, funcInfo, fReturnValue && (pnodeLastValStmt == nullptr)); |
| |
| EndEmitBlock(pnodeBlock, byteCodeGenerator, funcInfo); |
| } |
| |
| void ClearTmpRegs(ParseNode* pnode, ByteCodeGenerator* byteCodeGenerator, FuncInfo* emitFunc) |
| { |
| if (emitFunc->IsTmpReg(pnode->location)) |
| { |
| pnode->location = Js::Constants::NoRegister; |
| } |
| } |
| |
| void ByteCodeGenerator::EmitTopLevelStatement(ParseNode *stmt, FuncInfo *funcInfo, BOOL fReturnValue) |
| { |
| if (stmt->nop == knopFncDecl && stmt->sxFnc.IsDeclaration()) |
| { |
| // Function declarations (not function-declaration RHS's) are already fully processed. |
| // Skip them here so the temp registers don't get messed up. |
| return; |
| } |
| |
| if (stmt->nop == knopName || stmt->nop == knopDot) |
| { |
| // Generating span for top level names are mostly useful in debugging mode, because user can debug it even though no side-effect expected. |
| // But the name can have runtime error, e.g., foo.bar; // where foo is not defined. |
| // At this time we need to throw proper line number and offset. so recording on all modes will be useful. |
| StartStatement(stmt); |
| Writer()->Empty(Js::OpCode::Nop); |
| EndStatement(stmt); |
| } |
| |
| Emit(stmt, this, funcInfo, fReturnValue, false/*isConstructorCall*/, nullptr/*bindPnode*/, true/*isTopLevel*/); |
| if (funcInfo->IsTmpReg(stmt->location)) |
| { |
| if (!stmt->isUsed && !fReturnValue) |
| { |
| m_writer.Reg1(Js::OpCode::Unused, stmt->location); |
| } |
| funcInfo->ReleaseLoc(stmt); |
| } |
| } |
| |
| // ByteCodeGenerator::DefineFunctions |
| // |
| // Emit byte code for scope-wide function definitions before any calls in the scope, regardless of lexical |
| // order. Note that stores to the closure array are not emitted until we see the knopFncDecl in the tree |
| // to make sure that sources of the stores have been defined. |
| void ByteCodeGenerator::DefineFunctions(FuncInfo *funcInfoParent) |
| { |
| // DefineCachedFunctions doesn't depend on whether the user vars are declared or not, so |
| // we'll just overload this variable to mean that the functions getting called again and we don't need to do anything |
| if (funcInfoParent->GetHasCachedScope()) |
| { |
| this->DefineCachedFunctions(funcInfoParent); |
| } |
| else |
| { |
| this->DefineUncachedFunctions(funcInfoParent); |
| } |
| } |
| |
| // Iterate over all child functions in a function's parameter and body scopes. |
| template<typename Fn> |
| void MapContainerScopeFunctions(ParseNode* pnodeScope, Fn fn) |
| { |
| auto mapFncDeclsInScopeList = [&](ParseNode *pnodeHead) |
| { |
| for (ParseNode *pnode = pnodeHead; pnode != nullptr;) |
| { |
| switch (pnode->nop) |
| { |
| case knopFncDecl: |
| fn(pnode); |
| pnode = pnode->sxFnc.pnodeNext; |
| break; |
| |
| case knopBlock: |
| pnode = pnode->sxBlock.pnodeNext; |
| break; |
| |
| case knopCatch: |
| pnode = pnode->sxCatch.pnodeNext; |
| break; |
| |
| case knopWith: |
| pnode = pnode->sxWith.pnodeNext; |
| break; |
| |
| default: |
| AssertMsg(false, "Unexpected opcode in tree of scopes"); |
| return; |
| } |
| } |
| }; |
| pnodeScope->sxFnc.MapContainerScopes(mapFncDeclsInScopeList); |
| } |
| |
| void ByteCodeGenerator::DefineCachedFunctions(FuncInfo *funcInfoParent) |
| { |
| ParseNode *pnodeParent = funcInfoParent->root; |
| uint slotCount = 0; |
| |
| auto countFncSlots = [&](ParseNode *pnodeFnc) |
| { |
| if (pnodeFnc->sxFnc.GetFuncSymbol() != nullptr && pnodeFnc->sxFnc.IsDeclaration()) |
| { |
| slotCount++; |
| } |
| }; |
| MapContainerScopeFunctions(pnodeParent, countFncSlots); |
| |
| if (slotCount == 0) |
| { |
| return; |
| } |
| |
| size_t extraBytesActual = AllocSizeMath::Mul(slotCount, sizeof(Js::FuncInfoEntry)); |
| // Reg2Aux takes int for byteCount so we need to convert to int. OOM if we can't because it would truncate data. |
| if (extraBytesActual > INT_MAX) |
| { |
| Js::Throw::OutOfMemory(); |
| } |
| int extraBytes = (int)extraBytesActual; |
| |
| Js::FuncInfoArray *info = AnewPlus(alloc, extraBytes, Js::FuncInfoArray, slotCount); |
| |
| slotCount = 0; |
| |
| auto fillEntries = [&](ParseNode *pnodeFnc) |
| { |
| Symbol *sym = pnodeFnc->sxFnc.GetFuncSymbol(); |
| if (sym != nullptr && (pnodeFnc->sxFnc.IsDeclaration())) |
| { |
| AssertMsg(!pnodeFnc->sxFnc.IsGenerator(), "Generator functions are not supported by InitCachedFuncs but since they always escape they should disable function caching"); |
| Js::FuncInfoEntry *entry = &info->elements[slotCount]; |
| entry->nestedIndex = pnodeFnc->sxFnc.nestedIndex; |
| entry->scopeSlot = sym->GetScopeSlot(); |
| slotCount++; |
| } |
| }; |
| MapContainerScopeFunctions(pnodeParent, fillEntries); |
| |
| m_writer.AuxNoReg(Js::OpCode::InitCachedFuncs, |
| info, |
| sizeof(Js::FuncInfoArray) + extraBytes, |
| sizeof(Js::FuncInfoArray) + extraBytes); |
| |
| slotCount = 0; |
| auto defineOrGetCachedFunc = [&](ParseNode *pnodeFnc) |
| { |
| Symbol *sym = pnodeFnc->sxFnc.GetFuncSymbol(); |
| if (pnodeFnc->sxFnc.IsDeclaration()) |
| { |
| // Do we need to define the function here (i.e., is it not one of our cached locals)? |
| // Only happens if the sym is null (e.g., function x.y(){}). |
| if (sym == nullptr) |
| { |
| this->DefineOneFunction(pnodeFnc, funcInfoParent); |
| } |
| else if (!sym->IsInSlot(funcInfoParent) && sym->GetLocation() != Js::Constants::NoRegister) |
| { |
| // If it was defined by InitCachedFuncs, do we need to put it in a register rather than a slot? |
| m_writer.Reg1Unsigned1(Js::OpCode::GetCachedFunc, sym->GetLocation(), slotCount); |
| } |
| // The "x = function() {...}" case is being generated on the fly, during emission, |
| // so the caller expects to be able to release this register. |
| funcInfoParent->ReleaseLoc(pnodeFnc); |
| pnodeFnc->location = Js::Constants::NoRegister; |
| slotCount++; |
| } |
| }; |
| MapContainerScopeFunctions(pnodeParent, defineOrGetCachedFunc); |
| |
| AdeletePlus(alloc, extraBytes, info); |
| } |
| |
| void ByteCodeGenerator::DefineUncachedFunctions(FuncInfo *funcInfoParent) |
| { |
| ParseNode *pnodeParent = funcInfoParent->root; |
| auto defineCheck = [&](ParseNode *pnodeFnc) |
| { |
| Assert(pnodeFnc->nop == knopFncDecl); |
| |
| // |
| // Don't define the function upfront in following cases |
| // 1. x = function() {...}; |
| // Don't define the function for all modes. |
| // Such a function can only be accessed via the LHS, so we define it at the assignment point |
| // rather than the scope entry to save a register (and possibly save the whole definition). |
| // |
| // 2. x = function f() {...}; |
| // f is not visible in the enclosing scope. |
| // Such function expressions should be emitted only at the assignment point, as can be used only |
| // after the assignment. Might save register. |
| // |
| |
| if (pnodeFnc->sxFnc.IsDeclaration()) |
| { |
| this->DefineOneFunction(pnodeFnc, funcInfoParent); |
| // The "x = function() {...}" case is being generated on the fly, during emission, |
| // so the caller expects to be able to release this register. |
| funcInfoParent->ReleaseLoc(pnodeFnc); |
| pnodeFnc->location = Js::Constants::NoRegister; |
| } |
| }; |
| MapContainerScopeFunctions(pnodeParent, defineCheck); |
| } |
| |
| void EmitAssignmentToFuncName(ParseNode *pnodeFnc, ByteCodeGenerator *byteCodeGenerator, FuncInfo *funcInfoParent) |
| { |
| // Assign the location holding the func object reference to the given name. |
| Symbol *sym = pnodeFnc->sxFnc.pnodeName->sxVar.sym; |
| |
| if (sym != nullptr && !sym->GetFuncExpr()) |
| { |
| if (sym->GetIsModuleExportStorage()) |
| { |
| byteCodeGenerator->EmitPropStore(pnodeFnc->location, sym, nullptr, funcInfoParent); |
| } |
| else if (sym->GetIsGlobal()) |
| { |
| Js::PropertyId propertyId = sym->GetPosition(); |
| byteCodeGenerator->EmitGlobalFncDeclInit(pnodeFnc->location, propertyId, funcInfoParent); |
| if (byteCodeGenerator->GetFlags() & fscrEval && !funcInfoParent->GetIsStrictMode()) |
| { |
| byteCodeGenerator->EmitPropStore(pnodeFnc->location, sym, nullptr, funcInfoParent); |
| } |
| } |
| else |
| { |
| if (sym->NeedsSlotAlloc(funcInfoParent)) |
| { |
| if (!sym->GetHasNonCommittedReference() || |
| (funcInfoParent->GetParsedFunctionBody()->DoStackNestedFunc())) |
| { |
| // No point in trying to optimize if there are no references before we have to commit to slot. |
| // And not safe to delay putting a stack function in the slot, since we may miss boxing. |
| sym->SetIsCommittedToSlot(); |
| } |
| } |
| |
| if (sym->GetScope()->GetFunc() != byteCodeGenerator->TopFuncInfo()) |
| { |
| byteCodeGenerator->EmitPropStore(pnodeFnc->location, sym, nullptr, funcInfoParent); |
| } |
| else |
| { |
| byteCodeGenerator->EmitLocalPropInit(pnodeFnc->location, sym, funcInfoParent); |
| } |
| |
| Symbol * fncScopeSym = sym->GetFuncScopeVarSym(); |
| |
| if (fncScopeSym) |
| { |
| if (fncScopeSym->GetIsGlobal() && byteCodeGenerator->GetFlags() & fscrEval) |
| { |
| Js::PropertyId propertyId = fncScopeSym->GetPosition(); |
| byteCodeGenerator->EmitGlobalFncDeclInit(pnodeFnc->location, propertyId, funcInfoParent); |
| } |
| else |
| { |
| byteCodeGenerator->EmitPropStore(pnodeFnc->location, fncScopeSym, nullptr, funcInfoParent, false, false, /* isFncDeclVar */true); |
| } |
| } |
| } |
| } |
| } |
| |
| Js::RegSlot ByteCodeGenerator::DefineOneFunction(ParseNode *pnodeFnc, FuncInfo *funcInfoParent, bool generateAssignment, Js::RegSlot regEnv, Js::RegSlot frameDisplayTemp) |
| { |
| Assert(pnodeFnc->nop == knopFncDecl); |
| |
| funcInfoParent->AcquireLoc(pnodeFnc); |
| |
| if (regEnv == Js::Constants::NoRegister) |
| { |
| // If the child needs a closure, find a heap-allocated frame to pass to it. |
| if (frameDisplayTemp != Js::Constants::NoRegister) |
| { |
| // We allocated a temp to hold a local frame display value. Use that. |
| // It's likely that the FD is on the stack, and we used the temp to load it back. |
| regEnv = frameDisplayTemp; |
| } |
| else if (funcInfoParent->frameDisplayRegister != Js::Constants::NoRegister) |
| { |
| // This function has built a frame display, so pass it down. |
| regEnv = funcInfoParent->frameDisplayRegister; |
| } |
| else |
| { |
| // This function has no captured locals but inherits a closure environment, so pass it down. |
| regEnv = funcInfoParent->GetEnvRegister(); |
| } |
| |
| regEnv = this->PrependLocalScopes(regEnv, Js::Constants::NoRegister, funcInfoParent); |
| } |
| |
| // AssertMsg(funcInfo->nonLocalSymbols == 0 || regEnv != funcInfoParent->nullConstantRegister, |
| // "We need a closure for the nested function"); |
| |
| // If we are in a parameter scope and it is not merged with body scope then we have to create the child function as an inner function |
| if (regEnv == funcInfoParent->frameDisplayRegister || regEnv == funcInfoParent->GetEnvRegister()) |
| { |
| m_writer.NewFunction(pnodeFnc->location, pnodeFnc->sxFnc.nestedIndex, pnodeFnc->sxFnc.IsGenerator()); |
| } |
| else |
| { |
| m_writer.NewInnerFunction(pnodeFnc->location, pnodeFnc->sxFnc.nestedIndex, regEnv, pnodeFnc->sxFnc.IsGenerator()); |
| } |
| |
| if (funcInfoParent->IsGlobalFunction() && (this->flags & fscrEval)) |
| { |
| // A function declared at global scope in eval is untrackable, |
| // so make sure the caller's cached scope is invalidated. |
| this->funcEscapes = true; |
| } |
| else |
| { |
| if (pnodeFnc->sxFnc.IsDeclaration()) |
| { |
| Symbol * funcSymbol = pnodeFnc->sxFnc.GetFuncSymbol(); |
| if (funcSymbol) |
| { |
| // In the case where a let/const declaration is the same symbol name |
| // as the function declaration (shadowing case), the let/const var and |
| // the function declaration symbol are the same and share the same flags |
| // (particularly, sym->GetIsBlockVar() for this code path). |
| // |
| // For example: |
| // let a = 0; // <-- sym->GetIsBlockVar() = true |
| // function b(){} // <-- sym2->GetIsBlockVar() = false |
| // |
| // let x = 0; // <-- sym3->GetIsBlockVar() = true |
| // function x(){} // <-- sym3->GetIsBlockVar() = true |
| // |
| // In order to tell if the function is actually part |
| // of a block scope, we compare against the function scope here. |
| // Note that having a function with the same name as a let/const declaration |
| // is a redeclaration error, but we're pushing the fix for this out since it's |
| // a bit involved. |
| Assert(funcInfoParent->GetBodyScope() != nullptr && funcSymbol->GetScope() != nullptr); |
| bool isFunctionDeclarationInBlock = funcSymbol->GetIsBlockVar(); |
| |
| // Track all vars/lets/consts register slot function declarations. |
| if (ShouldTrackDebuggerMetadata() |
| // If this is a let binding function declaration at global level, we want to |
| // be sure to track the register location as well. |
| && !(funcInfoParent->IsGlobalFunction() && !isFunctionDeclarationInBlock)) |
| { |
| if (!funcSymbol->IsInSlot(funcInfoParent)) |
| { |
| funcInfoParent->byteCodeFunction->GetFunctionBody()->InsertSymbolToRegSlotList(funcSymbol->GetName(), pnodeFnc->location, funcInfoParent->varRegsCount); |
| } |
| } |
| |
| if (isFunctionDeclarationInBlock) |
| { |
| // We only track inner let bindings for the debugger side. |
| this->TrackFunctionDeclarationPropertyForDebugger(funcSymbol, funcInfoParent); |
| } |
| } |
| } |
| } |
| |
| if (pnodeFnc->sxFnc.IsDefaultModuleExport()) |
| { |
| this->EmitAssignmentToDefaultModuleExport(pnodeFnc, funcInfoParent); |
| } |
| |
| if (pnodeFnc->sxFnc.pnodeName == nullptr || !generateAssignment) |
| { |
| return regEnv; |
| } |
| |
| EmitAssignmentToFuncName(pnodeFnc, this, funcInfoParent); |
| |
| return regEnv; |
| } |
| |
| void ByteCodeGenerator::DefineUserVars(FuncInfo *funcInfo) |
| { |
| // Initialize scope-wide variables on entry to the scope. TODO: optimize by detecting uses that are always reached |
| // by an existing initialization. |
| |
| BOOL fGlobal = funcInfo->IsGlobalFunction(); |
| ParseNode *pnode; |
| Js::FunctionBody *byteCodeFunction = funcInfo->GetParsedFunctionBody(); |
| // Global declarations need a temp register to hold the init value, but the node shouldn't get a register. |
| // Just assign one on the fly and re-use it for all initializations. |
| Js::RegSlot tmpReg = fGlobal ? funcInfo->AcquireTmpRegister() : Js::Constants::NoRegister; |
| |
| for (pnode = funcInfo->root->sxFnc.pnodeVars; pnode; pnode = pnode->sxVar.pnodeNext) |
| { |
| Symbol* sym = pnode->sxVar.sym; |
| |
| if (sym != nullptr && !(pnode->sxVar.isBlockScopeFncDeclVar && sym->GetIsBlockVar())) |
| { |
| if (sym->GetIsCatch() || (pnode->nop == knopVarDecl && sym->GetIsBlockVar())) |
| { |
| // The init node was bound to the catch object, because it's inside a catch and has the |
| // same name as the catch object. But we want to define a user var at function scope, |
| // so find the right symbol. (We'll still assign the RHS value to the catch object symbol.) |
| // This also applies to a var declaration in the same scope as a let declaration. |
| #if DBG |
| if (!sym->GetIsCatch()) |
| { |
| // Assert that catch cannot be at function scope and let and var at function scope is redeclaration error. |
| Assert(funcInfo->bodyScope != sym->GetScope()); |
| } |
| #endif |
| sym = funcInfo->bodyScope->FindLocalSymbol(sym->GetName()); |
| Assert(sym && !sym->GetIsCatch() && !sym->GetIsBlockVar()); |
| } |
| |
| if (sym->GetSymbolType() == STVariable) |
| { |
| if (fGlobal) |
| { |
| Js::PropertyId propertyId = sym->EnsurePosition(this); |
| // We do need to initialize some globals to avoid JS errors on loading undefined variables. |
| // But we first need to make sure we're not trashing built-ins. |
| |
| if (this->flags & fscrEval) |
| { |
| if (funcInfo->byteCodeFunction->GetIsStrictMode()) |
| { |
| // Check/Init the property of the frame object |
| this->m_writer.ElementRootU(Js::OpCode::LdLocalElemUndef, |
| funcInfo->FindOrAddReferencedPropertyId(propertyId)); |
| } |
| else |
| { |
| // The check and the init involve the first element in the scope chain. |
| this->m_writer.ElementScopedU( |
| Js::OpCode::LdElemUndefScoped, funcInfo->FindOrAddReferencedPropertyId(propertyId)); |
| } |
| } |
| else if (sym->GetIsModuleExportStorage()) |
| { |
| Js::RegSlot reg = funcInfo->AcquireTmpRegister(); |
| this->m_writer.Reg1(Js::OpCode::LdUndef, reg); |
| EmitModuleExportAccess(sym, Js::OpCode::StModuleSlot, reg, funcInfo); |
| funcInfo->ReleaseTmpRegister(reg); |
| } |
| else |
| { |
| this->m_writer.ElementU(Js::OpCode::LdElemUndef, ByteCodeGenerator::RootObjectRegister, |
| funcInfo->FindOrAddReferencedPropertyId(propertyId)); |
| } |
| } |
| else if (!sym->GetIsArguments()) |
| { |
| if (sym->NeedsSlotAlloc(funcInfo)) |
| { |
| if (!sym->GetHasNonCommittedReference() || |
| (sym->GetHasFuncAssignment() && funcInfo->GetParsedFunctionBody()->DoStackNestedFunc())) |
| { |
| // No point in trying to optimize if there are no references before we have to commit to slot. |
| // And not safe to delay putting a stack function in the slot, since we may miss boxing. |
| sym->SetIsCommittedToSlot(); |
| } |
| } |
| |
| if ((!sym->GetHasInit() && !sym->IsInSlot(funcInfo)) || |
| (funcInfo->bodyScope->GetIsObject() && !funcInfo->GetHasCachedScope())) |
| { |
| // If the current symbol is the duplicate arguments symbol created in the body for split |
| // scope then load undef only if the arguments symbol is used in the body. |
| if (!funcInfo->IsInnerArgumentsSymbol(sym) || funcInfo->GetHasArguments()) |
| { |
| Js::RegSlot reg = sym->GetLocation(); |
| if (reg == Js::Constants::NoRegister) |
| { |
| Assert(sym->IsInSlot(funcInfo)); |
| reg = funcInfo->AcquireTmpRegister(); |
| } |
| this->m_writer.Reg1(Js::OpCode::LdUndef, reg); |
| this->EmitLocalPropInit(reg, sym, funcInfo); |
| |
| if (ShouldTrackDebuggerMetadata() && !sym->GetHasInit() && !sym->IsInSlot(funcInfo)) |
| { |
| byteCodeFunction->InsertSymbolToRegSlotList(sym->GetName(), reg, funcInfo->varRegsCount); |
| } |
| |
| funcInfo->ReleaseTmpRegister(reg); |
| } |
| } |
| } |
| else if (ShouldTrackDebuggerMetadata()) |
| { |
| if (!sym->GetHasInit() && !sym->IsInSlot(funcInfo)) |
| { |
| Js::RegSlot reg = sym->GetLocation(); |
| if (reg != Js::Constants::NoRegister) |
| { |
| byteCodeFunction->InsertSymbolToRegSlotList(sym->GetName(), reg, funcInfo->varRegsCount); |
| } |
| } |
| } |
| sym->SetHasInit(TRUE); |
| } |
| } |
| |
| } |
| if (tmpReg != Js::Constants::NoRegister) |
| { |
| funcInfo->ReleaseTmpRegister(tmpReg); |
| } |
| |
| for (int i = 0; i < funcInfo->nonUserNonTempRegistersToInitialize.Count(); ++i) |
| { |
| m_writer.Reg1(Js::OpCode::LdUndef, funcInfo->nonUserNonTempRegistersToInitialize.Item(i)); |
| } |
| } |
| |
| void ByteCodeGenerator::InitBlockScopedNonTemps(ParseNode *pnode, FuncInfo *funcInfo) |
| { |
| // Initialize all non-temp register variables on entry to the enclosing func - in particular, |
| // those with lifetimes that begin after the start of user code and may not be initialized normally. |
| // This protects us from, for instance, trying to restore garbage on bailout. |
| // It was originally done in debugger mode only, but we do it always to avoid issues with boxing |
| // garbage on exit from jitted loop bodies. |
| while (pnode) |
| { |
| switch (pnode->nop) |
| { |
| case knopFncDecl: |
| { |
| // If this is a block-scoped function, initialize it. |
| ParseNode *pnodeName = pnode->sxFnc.pnodeName; |
| if (!pnode->sxFnc.IsMethod() && pnodeName && pnodeName->nop == knopVarDecl) |
| { |
| Symbol *sym = pnodeName->sxVar.sym; |
| Assert(sym); |
| if (sym->GetLocation() != Js::Constants::NoRegister && |
| sym->GetScope()->IsBlockScope(funcInfo) && |
| sym->GetScope()->GetFunc() == funcInfo) |
| { |
| this->m_writer.Reg1(Js::OpCode::LdUndef, sym->GetLocation()); |
| } |
| } |
| |
| // No need to recurse to the nested scopes, as they belong to a nested function. |
| pnode = pnode->sxFnc.pnodeNext; |
| break; |
| } |
| |
| case knopBlock: |
| { |
| Scope *scope = pnode->sxBlock.scope; |
| if (scope) |
| { |
| if (scope->IsBlockScope(funcInfo)) |
| { |
| Js::RegSlot scopeLoc = scope->GetLocation(); |
| if (scopeLoc != Js::Constants::NoRegister && !funcInfo->IsTmpReg(scopeLoc)) |
| { |
| this->m_writer.Reg1(Js::OpCode::LdUndef, scopeLoc); |
| } |
| } |
| auto fnInit = [this, funcInfo](ParseNode *pnode) |
| { |
| Symbol *sym = pnode->sxVar.sym; |
| if (!sym->IsInSlot(funcInfo) && !sym->GetIsGlobal()) |
| { |
| this->m_writer.Reg1(Js::OpCode::InitUndecl, pnode->sxVar.sym->GetLocation()); |
| } |
| }; |
| IterateBlockScopedVariables(pnode, fnInit); |
| } |
| InitBlockScopedNonTemps(pnode->sxBlock.pnodeScopes, funcInfo); |
| pnode = pnode->sxBlock.pnodeNext; |
| break; |
| } |
| case knopCatch: |
| InitBlockScopedNonTemps(pnode->sxCatch.pnodeScopes, funcInfo); |
| pnode = pnode->sxCatch.pnodeNext; |
| break; |
| |
| case knopWith: |
| { |
| Js::RegSlot withLoc = pnode->location; |
| AssertMsg(withLoc != Js::Constants::NoRegister && !funcInfo->IsTmpReg(withLoc), |
| "We should put with objects at known stack locations in debug mode"); |
| this->m_writer.Reg1(Js::OpCode::LdUndef, withLoc); |
| InitBlockScopedNonTemps(pnode->sxWith.pnodeScopes, funcInfo); |
| pnode = pnode->sxWith.pnodeNext; |
| break; |
| } |
| |
| default: |
| Assert(false); |
| return; |
| } |
| } |
| } |
| |
| void ByteCodeGenerator::EmitScopeObjectInit(FuncInfo *funcInfo) |
| { |
| Assert(!funcInfo->byteCodeFunction->GetFunctionBody()->DoStackNestedFunc()); |
| |
| if (!funcInfo->GetHasCachedScope() /* || forcing scope/inner func caching */) |
| { |
| return; |
| } |
| |
| uint slotCount = funcInfo->bodyScope->GetScopeSlotCount(); |
| uint cachedFuncCount = 0; |
| Js::PropertyId firstFuncSlot = Js::Constants::NoProperty; |
| Js::PropertyId firstVarSlot = Js::Constants::NoProperty; |
| uint extraAlloc = (slotCount + Js::ActivationObjectEx::ExtraSlotCount()) * sizeof(Js::PropertyId); |
| |
| // Create and fill the array of local property ID's. |
| // They all have slots assigned to them already (if they need them): see StartEmitFunction. |
| |
| Js::PropertyIdArray *propIds = AnewPlus(alloc, extraAlloc, Js::PropertyIdArray, slotCount); |
| |
| ParseNode *pnodeFnc = funcInfo->root; |
| ParseNode *pnode; |
| Symbol *sym; |
| |
| if (funcInfo->GetFuncExprNameReference() && pnodeFnc->sxFnc.GetFuncSymbol()->GetScope() == funcInfo->GetBodyScope()) |
| { |
| Symbol::SaveToPropIdArray(pnodeFnc->sxFnc.GetFuncSymbol(), propIds, this); |
| } |
| |
| if (funcInfo->GetHasArguments()) |
| { |
| // Because the arguments object can access all instances of same-named formals ("function(x,x){...}"), |
| // be sure we initialize any duplicate appearances of a formal parameter to "NoProperty". |
| Js::PropertyId slot = 0; |
| auto initArg = [&](ParseNode *pnode) |
| { |
| if (pnode->IsVarLetOrConst()) |
| { |
| Symbol *sym = pnode->sxVar.sym; |
| Assert(sym); |
| if (sym->GetScopeSlot() == slot) |
| { |
| // This is the last appearance of the formal, so record the ID. |
| Symbol::SaveToPropIdArray(sym, propIds, this); |
| } |
| else |
| { |
| // This is an earlier duplicate appearance of the formal, so use NoProperty as a placeholder |
| // since this slot can't be accessed by name. |
| Assert(sym->GetScopeSlot() != Js::Constants::NoProperty && sym->GetScopeSlot() > slot); |
| propIds->elements[slot] = Js::Constants::NoProperty; |
| } |
| } |
| else |
| { |
| // This is for patterns |
| propIds->elements[slot] = Js::Constants::NoProperty; |
| } |
| slot++; |
| }; |
| MapFormalsWithoutRest(pnodeFnc, initArg); |
| |
| // If the rest is in the slot - we need to keep that slot. |
| if (pnodeFnc->sxFnc.pnodeRest != nullptr && pnodeFnc->sxFnc.pnodeRest->sxVar.sym->IsInSlot(funcInfo)) |
| { |
| Symbol::SaveToPropIdArray(pnodeFnc->sxFnc.pnodeRest->sxVar.sym, propIds, this); |
| } |
| } |
| else |
| { |
| MapFormals(pnodeFnc, [&](ParseNode *pnode) |
| { |
| if (pnode->IsVarLetOrConst()) |
| { |
| Symbol::SaveToPropIdArray(pnode->sxVar.sym, propIds, this); |
| } |
| }); |
| } |
| |
| auto saveFunctionVarsToPropIdArray = [&](ParseNode *pnodeFunction) |
| { |
| if (pnodeFunction->sxFnc.IsDeclaration()) |
| { |
| ParseNode *pnodeName = pnodeFunction->sxFnc.pnodeName; |
| if (pnodeName != nullptr) |
| { |
| while (pnodeName->nop == knopList) |
| { |
| if (pnodeName->sxBin.pnode1->nop == knopVarDecl) |
| { |
| sym = pnodeName->sxBin.pnode1->sxVar.sym; |
| if (sym) |
| { |
| Symbol::SaveToPropIdArray(sym, propIds, this, &firstFuncSlot); |
| } |
| } |
| pnodeName = pnodeName->sxBin.pnode2; |
| } |
| if (pnodeName->nop == knopVarDecl) |
| { |
| sym = pnodeName->sxVar.sym; |
| if (sym) |
| { |
| Symbol::SaveToPropIdArray(sym, propIds, this, &firstFuncSlot); |
| cachedFuncCount++; |
| } |
| } |
| } |
| } |
| }; |
| MapContainerScopeFunctions(pnodeFnc, saveFunctionVarsToPropIdArray); |
| |
| for (pnode = pnodeFnc->sxFnc.pnodeVars; pnode; pnode = pnode->sxVar.pnodeNext) |
| { |
| sym = pnode->sxVar.sym; |
| if (!(pnode->sxVar.isBlockScopeFncDeclVar && sym->GetIsBlockVar())) |
| { |
| if (sym->GetIsCatch() || (pnode->nop == knopVarDecl && sym->GetIsBlockVar())) |
| { |
| sym = funcInfo->bodyScope->FindLocalSymbol(sym->GetName()); |
| } |
| Symbol::SaveToPropIdArray(sym, propIds, this, &firstVarSlot); |
| } |
| } |
| |
| ParseNode *pnodeBlock = pnodeFnc->sxFnc.pnodeScopes; |
| for (pnode = pnodeBlock->sxBlock.pnodeLexVars; pnode; pnode = pnode->sxVar.pnodeNext) |
| { |
| sym = pnode->sxVar.sym; |
| Symbol::SaveToPropIdArray(sym, propIds, this, &firstVarSlot); |
| } |
| |
| pnodeBlock = pnodeFnc->sxFnc.pnodeBodyScope; |
| for (pnode = pnodeBlock->sxBlock.pnodeLexVars; pnode; pnode = pnode->sxVar.pnodeNext) |
| { |
| sym = pnode->sxVar.sym; |
| Symbol::SaveToPropIdArray(sym, propIds, this, &firstVarSlot); |
| } |
| |
| if (funcInfo->thisScopeSlot != Js::Constants::NoRegister) |
| { |
| propIds->elements[funcInfo->thisScopeSlot] = Js::PropertyIds::_lexicalThisSlotSymbol; |
| } |
| if (funcInfo->newTargetScopeSlot != Js::Constants::NoRegister) |
| { |
| propIds->elements[funcInfo->newTargetScopeSlot] = Js::PropertyIds::_lexicalNewTargetSymbol; |
| } |
| if (funcInfo->superScopeSlot != Js::Constants::NoRegister) |
| { |
| propIds->elements[funcInfo->superScopeSlot] = Js::PropertyIds::_superReferenceSymbol; |
| } |
| if (funcInfo->superCtorScopeSlot != Js::Constants::NoRegister) |
| { |
| propIds->elements[funcInfo->superCtorScopeSlot] = Js::PropertyIds::_superCtorReferenceSymbol; |
| } |
| |
| // Write the first func slot and first var slot into the auxiliary data |
| Js::PropertyId *slots = propIds->elements + slotCount; |
| slots[0] = cachedFuncCount; |
| slots[1] = firstFuncSlot; |
| slots[2] = firstVarSlot; |
| slots[3] = funcInfo->GetParsedFunctionBody()->NewObjectLiteral(); |
| |
| propIds->hasNonSimpleParams = funcInfo->root->sxFnc.HasNonSimpleParameterList(); |
| funcInfo->localPropIdOffset = m_writer.InsertAuxiliaryData(propIds, sizeof(Js::PropertyIdArray) + extraAlloc); |
| Assert(funcInfo->localPropIdOffset == 0); |
| funcInfo->GetParsedFunctionBody()->SetHasCachedScopePropIds(true); |
| |
| AdeletePlus(alloc, extraAlloc, propIds); |
| } |
| |
| void ByteCodeGenerator::SetClosureRegisters(FuncInfo* funcInfo, Js::FunctionBody* byteCodeFunction) |
| { |
| if (funcInfo->frameDisplayRegister != Js::Constants::NoRegister) |
| { |
| byteCodeFunction->MapAndSetLocalFrameDisplayRegister(funcInfo->frameDisplayRegister); |
| } |
| |
| if (funcInfo->frameObjRegister != Js::Constants::NoRegister) |
| { |
| byteCodeFunction->MapAndSetLocalClosureRegister(funcInfo->frameObjRegister); |
| byteCodeFunction->SetHasScopeObject(true); |
| } |
| else if (funcInfo->frameSlotsRegister != Js::Constants::NoRegister) |
| { |
| byteCodeFunction->MapAndSetLocalClosureRegister(funcInfo->frameSlotsRegister); |
| } |
| |
| if (funcInfo->paramSlotsRegister != Js::Constants::NoRegister) |
| { |
| byteCodeFunction->MapAndSetParamClosureRegister(funcInfo->paramSlotsRegister); |
| } |
| } |
| |
| void ByteCodeGenerator::FinalizeRegisters(FuncInfo * funcInfo, Js::FunctionBody * byteCodeFunction) |
| { |
| if (byteCodeFunction->IsGenerator()) |
| { |
| // EmitYield uses 'false' to create the IteratorResult object |
| funcInfo->AssignFalseConstRegister(); |
| } |
| |
| if (funcInfo->NeedEnvRegister()) |
| { |
| bool constReg = !funcInfo->GetIsTopLevelEventHandler() && funcInfo->IsGlobalFunction() && !(this->flags & fscrEval); |
| funcInfo->AssignEnvRegister(constReg); |
| } |
| |
| // Set the function body's constant count before emitting anything so that the byte code writer |
| // can distinguish constants from variables. |
| byteCodeFunction->CheckAndSetConstantCount(funcInfo->constRegsCount); |
| |
| this->SetClosureRegisters(funcInfo, byteCodeFunction); |
| |
| if (this->IsInDebugMode()) |
| { |
| // Give permanent registers to the inner scopes in debug mode. |
| uint innerScopeCount = funcInfo->InnerScopeCount(); |
| byteCodeFunction->SetInnerScopeCount(innerScopeCount); |
| if (innerScopeCount) |
| { |
| funcInfo->SetFirstInnerScopeReg(funcInfo->NextVarRegister()); |
| for (uint i = 1; i < innerScopeCount; i++) |
| { |
| funcInfo->NextVarRegister(); |
| } |
| } |
| } |
| |
| // NOTE: The FB expects the yield reg to be the final non-temp. |
| if (byteCodeFunction->IsGenerator()) |
| { |
| funcInfo->AssignYieldRegister(); |
| } |
| |
| Js::RegSlot firstTmpReg = funcInfo->varRegsCount; |
| funcInfo->SetFirstTmpReg(firstTmpReg); |
| byteCodeFunction->SetFirstTmpReg(funcInfo->RegCount()); |
| } |
| |
| void ByteCodeGenerator::InitScopeSlotArray(FuncInfo * funcInfo) |
| { |
| // Record slots info for ScopeSlots/ScopeObject. |
| uint scopeSlotCount = funcInfo->bodyScope->GetScopeSlotCount(); |
| Assert(funcInfo->paramScope == nullptr || funcInfo->paramScope->GetScopeSlotCount() == 0 || !funcInfo->paramScope->GetCanMergeWithBodyScope()); |
| uint scopeSlotCountForParamScope = funcInfo->paramScope != nullptr ? funcInfo->paramScope->GetScopeSlotCount() : 0; |
| |
| if (scopeSlotCount == 0 && scopeSlotCountForParamScope == 0) |
| { |
| return; |
| } |
| |
| Js::FunctionBody *byteCodeFunction = funcInfo->GetParsedFunctionBody(); |
| if (scopeSlotCount > 0 || scopeSlotCountForParamScope > 0) |
| { |
| byteCodeFunction->SetScopeSlotArraySizes(scopeSlotCount, scopeSlotCountForParamScope); |
| } |
| |
| // TODO: Need to add property ids for the case when scopeSlotCountForParamSCope is non-zero |
| if (scopeSlotCount) |
| { |
| Js::PropertyId *propertyIdsForScopeSlotArray = RecyclerNewArrayLeafZ(scriptContext->GetRecycler(), Js::PropertyId, scopeSlotCount); |
| byteCodeFunction->SetPropertyIdsForScopeSlotArray(propertyIdsForScopeSlotArray, scopeSlotCount, scopeSlotCountForParamScope); |
| AssertMsg(!byteCodeFunction->IsReparsed() || byteCodeFunction->m_wasEverAsmjsMode || byteCodeFunction->scopeSlotArraySize == scopeSlotCount, |
| "The slot array size is different between debug and non-debug mode"); |
| #if DEBUG |
| for (UINT i = 0; i < scopeSlotCount; i++) |
| { |
| propertyIdsForScopeSlotArray[i] = Js::Constants::NoProperty; |
| } |
| #endif |
| auto setPropertyIdForScopeSlotArray = |
| [scopeSlotCount, propertyIdsForScopeSlotArray] |
| (Js::PropertyId slot, Js::PropertyId propId) |
| { |
| if (slot < 0 || (uint)slot >= scopeSlotCount) |
| { |
| Js::Throw::FatalInternalError(); |
| } |
| propertyIdsForScopeSlotArray[slot] = propId; |
| }; |
| |
| auto setPropIdsForScopeSlotArray = [funcInfo, setPropertyIdForScopeSlotArray](Symbol *const sym) |
| { |
| if (sym->NeedsSlotAlloc(funcInfo)) |
| { |
| if (funcInfo->IsInnerArgumentsSymbol(sym) && !funcInfo->GetHasArguments()) |
| { |
| // In split scope case we have a duplicate symbol for arguments in the body (innerArgumentsSymbol). |
| // But if arguments is not referenced in the body we don't have to allocate scope slot for it. |
| // If we allocate one, then the debugger will assume that the arguments symbol is there and skip creating the fake one. |
| } |
| else |
| { |
| // All properties should get correct propertyId here. |
| Assert(sym->HasScopeSlot()); // We can't allocate scope slot now. Any symbol needing scope slot must have allocated it before this point. |
| setPropertyIdForScopeSlotArray(sym->GetScopeSlot(), sym->EnsurePosition(funcInfo)); |
| } |
| } |
| }; |
| |
| funcInfo->GetBodyScope()->ForEachSymbol(setPropIdsForScopeSlotArray); |
| |
| if (funcInfo->thisScopeSlot != Js::Constants::NoRegister) |
| { |
| setPropertyIdForScopeSlotArray(funcInfo->thisScopeSlot, Js::PropertyIds::_lexicalThisSlotSymbol); |
| } |
| |
| if (funcInfo->newTargetScopeSlot != Js::Constants::NoRegister) |
| { |
| setPropertyIdForScopeSlotArray(funcInfo->newTargetScopeSlot, Js::PropertyIds::_lexicalNewTargetSymbol); |
| } |
| |
| if (funcInfo->superScopeSlot != Js::Constants::NoRegister) |
| { |
| setPropertyIdForScopeSlotArray(funcInfo->superScopeSlot, Js::PropertyIds::_superReferenceSymbol); |
| } |
| |
| if (funcInfo->superCtorScopeSlot != Js::Constants::NoRegister) |
| { |
| setPropertyIdForScopeSlotArray(funcInfo->superCtorScopeSlot, Js::PropertyIds::_superCtorReferenceSymbol); |
| } |
| |
| #if DEBUG |
| for (UINT i = 0; i < scopeSlotCount; i++) |
| { |
| Assert(propertyIdsForScopeSlotArray[i] != Js::Constants::NoProperty |
| || funcInfo->frameObjRegister != Js::Constants::NoRegister); // ScopeObject may have unassigned entries, e.g. for same-named parameters |
| } |
| #endif |
| } |
| } |
| |
| // temporarily load all constants and special registers in a single block |
| void ByteCodeGenerator::LoadAllConstants(FuncInfo *funcInfo) |
| { |
| Symbol *sym; |
| |
| Js::FunctionBody *byteCodeFunction = funcInfo->GetParsedFunctionBody(); |
| byteCodeFunction->CreateConstantTable(); |
| |
| if (funcInfo->nullConstantRegister != Js::Constants::NoRegister) |
| { |
| byteCodeFunction->RecordNullObject(byteCodeFunction->MapRegSlot(funcInfo->nullConstantRegister)); |
| } |
| |
| if (funcInfo->undefinedConstantRegister != Js::Constants::NoRegister) |
| { |
| byteCodeFunction->RecordUndefinedObject(byteCodeFunction->MapRegSlot(funcInfo->undefinedConstantRegister)); |
| } |
| |
| if (funcInfo->trueConstantRegister != Js::Constants::NoRegister) |
| { |
| byteCodeFunction->RecordTrueObject(byteCodeFunction->MapRegSlot(funcInfo->trueConstantRegister)); |
| } |
| |
| if (funcInfo->falseConstantRegister != Js::Constants::NoRegister) |
| { |
| byteCodeFunction->RecordFalseObject(byteCodeFunction->MapRegSlot(funcInfo->falseConstantRegister)); |
| } |
| |
| if (funcInfo->frameObjRegister != Js::Constants::NoRegister) |
| { |
| m_writer.RecordObjectRegister(funcInfo->frameObjRegister); |
| if (!funcInfo->GetApplyEnclosesArgs()) |
| { |
| this->EmitScopeObjectInit(funcInfo); |
| } |
| |
| #if DBG |
| uint count = 0; |
| funcInfo->GetBodyScope()->ForEachSymbol([&](Symbol *const sym) |
| { |
| if (sym->NeedsSlotAlloc(funcInfo)) |
| { |
| // All properties should get correct propertyId here. |
| count++; |
| } |
| }); |
| |
| if (funcInfo->GetParamScope() != nullptr) |
| { |
| funcInfo->GetParamScope()->ForEachSymbol([&](Symbol *const sym) |
| { |
| if (sym->NeedsSlotAlloc(funcInfo)) |
| { |
| // All properties should get correct propertyId here. |
| count++; |
| } |
| }); |
| } |
| |
| // A reparse should result in the same size of the activation object. |
| // Exclude functions which were created from the ByteCodeCache. |
| AssertMsg(!byteCodeFunction->IsReparsed() || byteCodeFunction->HasGeneratedFromByteCodeCache() || |
| byteCodeFunction->scopeObjectSize == count || byteCodeFunction->m_wasEverAsmjsMode, |
| "The activation object size is different between debug and non-debug mode"); |
| byteCodeFunction->scopeObjectSize = count; |
| #endif |
| } |
| else if (funcInfo->frameSlotsRegister != Js::Constants::NoRegister) |
| { |
| int scopeSlotCount = funcInfo->bodyScope->GetScopeSlotCount(); |
| int paramSlotCount = funcInfo->paramScope->GetScopeSlotCount(); |
| if (scopeSlotCount == 0 && paramSlotCount == 0) |
| { |
| AssertMsg(funcInfo->frameDisplayRegister != Js::Constants::NoRegister, "Why do we need scope slots?"); |
| m_writer.Reg1(Js::OpCode::LdC_A_Null, funcInfo->frameSlotsRegister); |
| } |
| } |
| |
| if (funcInfo->funcExprScope && funcInfo->funcExprScope->GetIsObject()) |
| { |
| byteCodeFunction->MapAndSetFuncExprScopeRegister(funcInfo->funcExprScope->GetLocation()); |
| byteCodeFunction->SetEnvDepth((uint16)-1); |
| } |
| |
| bool thisLoadedFromParams = false; |
| |
| if (funcInfo->NeedEnvRegister()) |
| { |
| byteCodeFunction->MapAndSetEnvRegister(funcInfo->GetEnvRegister()); |
| if (funcInfo->GetIsTopLevelEventHandler()) |
| { |
| byteCodeFunction->MapAndSetThisRegisterForEventHandler(funcInfo->thisPointerRegister); |
| // The environment is the namespace hierarchy starting with "this". |
| Assert(!funcInfo->RegIsConst(funcInfo->GetEnvRegister())); |
| thisLoadedFromParams = true; |
| this->InvalidateCachedOuterScopes(funcInfo); |
| } |
| else if (funcInfo->IsGlobalFunction() && !(this->flags & fscrEval)) |
| { |
| Assert(funcInfo->RegIsConst(funcInfo->GetEnvRegister())); |
| |
| if (funcInfo->GetIsStrictMode()) |
| { |
| byteCodeFunction->RecordStrictNullDisplayConstant(byteCodeFunction->MapRegSlot(funcInfo->GetEnvRegister())); |
| } |
| else |
| { |
| byteCodeFunction->RecordNullDisplayConstant(byteCodeFunction->MapRegSlot(funcInfo->GetEnvRegister())); |
| } |
| } |
| else |
| { |
| // environment may be required to load "this" |
| Assert(!funcInfo->RegIsConst(funcInfo->GetEnvRegister())); |
| this->InvalidateCachedOuterScopes(funcInfo); |
| } |
| } |
| |
| if (funcInfo->frameDisplayRegister != Js::Constants::NoRegister) |
| { |
| m_writer.RecordFrameDisplayRegister(funcInfo->frameDisplayRegister); |
| } |
| |
| // new.target may be used to construct the 'this' register so make sure to load it first |
| if (funcInfo->newTargetRegister != Js::Constants::NoRegister) |
| { |
| this->LoadNewTargetObject(funcInfo); |
| } |
| |
| if (funcInfo->thisPointerRegister != Js::Constants::NoRegister) |
| { |
| this->LoadThisObject(funcInfo, thisLoadedFromParams); |
| } |
| |
| this->RecordAllIntConstants(funcInfo); |
| this->RecordAllStrConstants(funcInfo); |
| this->RecordAllStringTemplateCallsiteConstants(funcInfo); |
| |
| funcInfo->doubleConstantToRegister.Map([byteCodeFunction](double d, Js::RegSlot location) |
| { |
| byteCodeFunction->RecordFloatConstant(byteCodeFunction->MapRegSlot(location), d); |
| }); |
| |
| if (funcInfo->GetHasArguments()) |
| { |
| sym = funcInfo->GetArgumentsSymbol(); |
| Assert(sym); |
| Assert(funcInfo->GetHasHeapArguments()); |
| |
| if (funcInfo->GetCallsEval() || (!funcInfo->GetApplyEnclosesArgs())) |
| { |
| this->LoadHeapArguments(funcInfo); |
| } |
| |
| } |
| else if (!funcInfo->IsGlobalFunction() && !IsInNonDebugMode()) |
| { |
| uint count = funcInfo->inArgsCount + (funcInfo->root->sxFnc.pnodeRest != nullptr ? 1 : 0) - 1; |
| if (count != 0) |
| { |
| Js::PropertyIdArray *propIds = RecyclerNewPlus(scriptContext->GetRecycler(), count * sizeof(Js::PropertyId), Js::PropertyIdArray, count); |
| |
| GetFormalArgsArray(this, funcInfo, propIds); |
| byteCodeFunction->SetPropertyIdsOfFormals(propIds); |
| } |
| } |
| |
| // |
| // If the function is a function expression with a name, |
| // load the function object at runtime to its activation object. |
| // |
| sym = funcInfo->root->sxFnc.GetFuncSymbol(); |
| bool funcExprWithName = !funcInfo->IsGlobalFunction() && sym && sym->GetFuncExpr(); |
| |
| if (funcExprWithName) |
| { |
| if (funcInfo->GetFuncExprNameReference() || |
| (funcInfo->funcExprScope && funcInfo->funcExprScope->GetIsObject())) |
| { |
| // |
| // x = function f(...) { ... } |
| // A named function expression's name (Symbol:f) belongs to the enclosing scope. |
| // Thus there are no uses of 'f' within the scope of the function (as references to 'f' |
| // are looked up in the closure). So, we can't use f's register as it is from the enclosing |
| // scope's register namespace. So use a tmp register. |
| // In ES5 mode though 'f' is *not* a part of the enclosing scope. So we always assign 'f' a register |
| // from it's register namespace, which LdFuncExpr can use. |
| // |
| Js::RegSlot ldFuncExprDst = sym->GetLocation(); |
| this->m_writer.Reg1(Js::OpCode::LdFuncExpr, ldFuncExprDst); |
| |
| if (sym->IsInSlot(funcInfo)) |
| { |
| Assert(!this->TopFuncInfo()->GetParsedFunctionBody()->DoStackNestedFunc()); |
| Js::RegSlot scopeLocation; |
| AnalysisAssert(funcInfo->funcExprScope); |
| |
| if (funcInfo->funcExprScope->GetIsObject()) |
| { |
| scopeLocation = funcInfo->funcExprScope->GetLocation(); |
| this->m_writer.Property(Js::OpCode::StFuncExpr, sym->GetLocation(), scopeLocation, |
| funcInfo->FindOrAddReferencedPropertyId(sym->GetPosition())); |
| } |
| else |
| { |
| this->m_writer.ElementU(Js::OpCode::StLocalFuncExpr, sym->GetLocation(), |
| funcInfo->FindOrAddReferencedPropertyId(sym->GetPosition())); |
| } |
| } |
| else if (ShouldTrackDebuggerMetadata()) |
| { |
| funcInfo->byteCodeFunction->GetFunctionBody()->InsertSymbolToRegSlotList(sym->GetName(), sym->GetLocation(), funcInfo->varRegsCount); |
| } |
| } |
| } |
| } |
| |
| void ByteCodeGenerator::InvalidateCachedOuterScopes(FuncInfo *funcInfo) |
| { |
| Assert(funcInfo->GetEnvRegister() != Js::Constants::NoRegister); |
| |
| // Walk the scope stack, from funcInfo outward, looking for scopes that have been cached. |
| |
| Scope *scope = funcInfo->GetBodyScope()->GetEnclosingScope(); |
| uint32 envIndex = 0; |
| |
| while (scope && scope->GetFunc() == funcInfo) |
| { |
| // Skip over FuncExpr Scope and parameter scope for current funcInfo to get to the first enclosing scope of the outer function. |
| scope = scope->GetEnclosingScope(); |
| } |
| |
| for (; scope; scope = scope->GetEnclosingScope()) |
| { |
| FuncInfo *func = scope->GetFunc(); |
| if (scope == func->GetBodyScope()) |
| { |
| if (func->Escapes() && func->GetHasCachedScope()) |
| { |
| Assert(scope->GetIsObject()); |
| this->m_writer.Unsigned1(Js::OpCode::InvalCachedScope, envIndex); |
| } |
| } |
| if (scope->GetMustInstantiate()) |
| { |
| envIndex++; |
| } |
| } |
| } |
| |
| void ByteCodeGenerator::LoadThisObject(FuncInfo *funcInfo, bool thisLoadedFromParams) |
| { |
| if (this->scriptContext->GetConfig()->IsES6ClassAndExtendsEnabled() && funcInfo->IsClassConstructor()) |
| { |
| // Derived class constructors initialize 'this' to be Undecl |
| // - we'll check this value during a super call and during 'this' access |
| // Base class constructors initialize 'this' to a new object using new.target |
| if (funcInfo->IsBaseClassConstructor()) |
| { |
| EmitBaseClassConstructorThisObject(funcInfo); |
| } |
| else |
| { |
| this->m_writer.Reg1(Js::OpCode::InitUndecl, funcInfo->thisPointerRegister); |
| } |
| } |
| else if (!funcInfo->IsGlobalFunction() || (this->flags & fscrEval)) |
| { |
| // |
| // thisLoadedFromParams would be true for the event Handler case, |
| // "this" would have been loaded from parameters to put in the environment |
| // |
| if (!thisLoadedFromParams && !funcInfo->IsLambda()) |
| { |
| m_writer.ArgIn0(funcInfo->thisPointerRegister); |
| } |
| if (!(this->flags & fscrEval) || !funcInfo->IsGlobalFunction()) |
| { |
| // we don't want to emit 'this' for eval, because 'this' value in eval is equal to 'this' value of caller |
| // and does not depend on "use strict" inside of eval. |
| // so we pass 'this' directly in GlobalObject::EntryEval() |
| EmitThis(funcInfo, funcInfo->thisPointerRegister); |
| } |
| } |
| else |
| { |
| Assert(funcInfo->IsGlobalFunction()); |
| Js::RegSlot root = funcInfo->nullConstantRegister; |
| EmitThis(funcInfo, root); |
| } |
| } |
| |
| void ByteCodeGenerator::LoadNewTargetObject(FuncInfo *funcInfo) |
| { |
| if (funcInfo->IsClassConstructor()) |
| { |
| Assert(!funcInfo->IsLambda()); |
| |
| m_writer.ArgIn0(funcInfo->newTargetRegister); |
| } |
| else if (funcInfo->IsLambda() && !(this->flags & fscrEval)) |
| { |
| Scope *scope; |
| Js::PropertyId envIndex = -1; |
| GetEnclosingNonLambdaScope(funcInfo, scope, envIndex); |
| |
| if (scope->GetFunc()->IsGlobalFunction()) |
| { |
| m_writer.Reg1(Js::OpCode::LdUndef, funcInfo->newTargetRegister); |
| } |
| else |
| { |
| Js::PropertyId slot = scope->GetFunc()->newTargetScopeSlot; |
| EmitInternalScopedSlotLoad(funcInfo, scope, envIndex, slot, funcInfo->newTargetRegister); |
| } |
| } |
| else if (this->flags & fscrEval) |
| { |
| Js::RegSlot scopeLocation; |
| |
| if (funcInfo->byteCodeFunction->GetIsStrictMode() && funcInfo->IsGlobalFunction()) |
| { |
| scopeLocation = funcInfo->frameDisplayRegister; |
| } |
| else if (funcInfo->NeedEnvRegister()) |
| { |
| scopeLocation = funcInfo->GetEnvRegister(); |
| } |
| else |
| { |
| // If this eval doesn't have environment register or frame display register, we didn't capture anything from a class constructor. |
| m_writer.Reg1(Js::OpCode::LdNewTarget, funcInfo->newTargetRegister); |
| return; |
| } |
| |
| uint cacheId = funcInfo->FindOrAddInlineCacheId(scopeLocation, Js::PropertyIds::_lexicalNewTargetSymbol, false, false); |
| this->m_writer.ElementP(Js::OpCode::ScopedLdFld, funcInfo->newTargetRegister, cacheId); |
| } |
| else if (funcInfo->IsGlobalFunction()) |
| { |
| m_writer.Reg1(Js::OpCode::LdUndef, funcInfo->newTargetRegister); |
| } |
| else |
| { |
| m_writer.Reg1(Js::OpCode::LdNewTarget, funcInfo->newTargetRegister); |
| } |
| } |
| |
| void ByteCodeGenerator::EmitScopeSlotLoadThis(FuncInfo *funcInfo, Js::RegSlot regLoc, bool chkUndecl) |
| { |
| FuncInfo* nonLambdaFunc = funcInfo; |
| if (funcInfo->IsLambda()) |
| { |
| nonLambdaFunc = FindEnclosingNonLambda(); |
| } |
| |
| if (nonLambdaFunc->IsClassConstructor() && !nonLambdaFunc->IsBaseClassConstructor()) |
| { |
| // If we are in a derived class constructor and we have a scope slot for 'this', |
| // we need to load 'this' from the scope slot. This is to support the case where |
| // the call to initialize 'this' via super() is inside a lambda since the lambda |
| // can't assign to the 'this' register of the parent constructor. |
| if (nonLambdaFunc->thisScopeSlot != Js::Constants::NoRegister) |
| { |
| Js::PropertyId slot = nonLambdaFunc->thisScopeSlot; |
| |
| EmitInternalScopedSlotLoad(funcInfo, slot, regLoc, chkUndecl); |
| } |
| else if (funcInfo->thisPointerRegister != Js::Constants::NoRegister && chkUndecl) |
| { |
| this->m_writer.Reg1(Js::OpCode::ChkUndecl, funcInfo->thisPointerRegister); |
| } |
| else if (chkUndecl) |
| { |
| // If we don't have a scope slot for 'this' we know that super could not have |
| // been called inside a lambda so we can check to see if we called |
| // super and assigned to the this register already. If not, this should trigger |
| // a ReferenceError. |
| EmitUseBeforeDeclarationRuntimeError(this, Js::Constants::NoRegister); |
| } |
| } |
| else if (this->flags & fscrEval && (funcInfo->IsGlobalFunction() || (funcInfo->IsLambda() && nonLambdaFunc->IsGlobalFunction())) |
| && funcInfo->GetBodyScope()->GetIsObject()) |
| { |
| Js::RegSlot scopeLocation; |
| |
| if (funcInfo->byteCodeFunction->GetIsStrictMode() && funcInfo->IsGlobalFunction()) |
| { |
| scopeLocation = funcInfo->frameDisplayRegister; |
| } |
| else if (funcInfo->NeedEnvRegister()) |
| { |
| scopeLocation = funcInfo->GetEnvRegister(); |
| } |
| else |
| { |
| // If this eval doesn't have environment register or frame display register, we didn't capture anything from a class constructor |
| return; |
| } |
| |
| // CONSIDER [tawoll] - Should we add a ByteCodeGenerator flag (fscrEvalWithClassConstructorParent) and avoid doing this runtime check? |
| Js::ByteCodeLabel skipLabel = this->Writer()->DefineLabel(); |
| this->Writer()->BrReg1(Js::OpCode::BrNotUndecl_A, skipLabel, funcInfo->thisPointerRegister); |
| |
| uint cacheId = funcInfo->FindOrAddInlineCacheId(scopeLocation, Js::PropertyIds::_lexicalThisSlotSymbol, false, false); |
| this->m_writer.ElementP(Js::OpCode::ScopedLdFld, funcInfo->thisPointerRegister, cacheId); |
| if (chkUndecl) |
| { |
| this->m_writer.Reg1(Js::OpCode::ChkUndecl, funcInfo->thisPointerRegister); |
| } |
| |
| this->Writer()->MarkLabel(skipLabel); |
| } |
| } |
| |
| void ByteCodeGenerator::EmitScopeSlotStoreThis(FuncInfo *funcInfo, Js::RegSlot regLoc, bool chkUndecl) |
| { |
| if (this->flags & fscrEval && (funcInfo->IsGlobalFunction() || (funcInfo->IsLambda() && FindEnclosingNonLambda()->IsGlobalFunction()))) |
| { |
| Js::RegSlot scopeLocation; |
| |
| if (funcInfo->byteCodeFunction->GetIsStrictMode() && funcInfo->IsGlobalFunction()) |
| { |
| scopeLocation = funcInfo->frameDisplayRegister; |
| } |
| else |
| { |
| scopeLocation = funcInfo->GetEnvRegister(); |
| } |
| |
| uint cacheId = funcInfo->FindOrAddInlineCacheId(scopeLocation, Js::PropertyIds::_lexicalThisSlotSymbol, false, true); |
| this->m_writer.ElementP(GetScopedStFldOpCode(funcInfo->byteCodeFunction->GetIsStrictMode()), funcInfo->thisPointerRegister, cacheId); |
| } |
| else if (regLoc != Js::Constants::NoRegister) |
| { |
| EmitInternalScopedSlotStore(funcInfo, regLoc, funcInfo->thisPointerRegister); |
| } |
| } |
| |
| void ByteCodeGenerator::EmitSuperCall(FuncInfo* funcInfo, ParseNode* pnode, BOOL fReturnValue) |
| { |
| Assert(pnode->sxCall.pnodeTarget->nop == knopSuper); |
| |
| FuncInfo* nonLambdaFunc = funcInfo; |
| |
| if (funcInfo->IsLambda()) |
| { |
| nonLambdaFunc = this->FindEnclosingNonLambda(); |
| } |
| |
| if (nonLambdaFunc->IsBaseClassConstructor()) |
| { |
| // super() is not allowed in base class constructors. If we detect this, emit a ReferenceError and skip making the call. |
| this->Writer()->W1(Js::OpCode::RuntimeReferenceError, SCODE_CODE(JSERR_ClassSuperInBaseClass)); |
| return; |
| } |
| else |
| { |
| EmitSuperFieldPatch(funcInfo, pnode, this); |
| pnode->isUsed = true; |
| } |
| |
| // We already know pnode->sxCall.pnodeTarget->nop is super but we can't use the super register in case |
| // this is an eval and we will load super dynamically from the scope using ScopedLdSuper. |
| // That means we'll have to rely on the location of the call target to be sure. |
| // We have to make sure to allocate the location for the node now, before we try to branch on it. |
| Emit(pnode->sxCall.pnodeTarget, this, funcInfo, false, /*isConstructorCall*/ true); // reuse isConstructorCall ("new super()" is illegal) |
| |
| // |
| // if (super is class constructor) { |
| // _this = new.target; |
| // } else { |
| // _this = NewScObjFull(new.target); |
| // } |
| // |
| // temp = super.call(_this, new.target); // CallFlag_New | CallFlag_NewTarget | CallFlag_ExtraArg |
| // if (temp is object) { |
| // _this = temp; |
| // } |
| // |
| // if (UndeclBlockVar === this) { |
| // this = _this; |
| // } else { |
| // throw ReferenceError; |
| // } |
| // |
| funcInfo->AcquireLoc(pnode); |
| Js::RegSlot thisForSuperCall = funcInfo->AcquireTmpRegister(); |
| Js::ByteCodeLabel useNewTargetForThisLabel = this->Writer()->DefineLabel(); |
| Js::ByteCodeLabel makeCallLabel = this->Writer()->DefineLabel(); |
| Js::ByteCodeLabel useSuperCallResultLabel = this->Writer()->DefineLabel(); |
| Js::ByteCodeLabel doneLabel = this->Writer()->DefineLabel(); |
| |
| this->Writer()->BrReg1(Js::OpCode::BrOnClassConstructor, useNewTargetForThisLabel, pnode->sxCall.pnodeTarget->location); |
| |
| this->Writer()->Reg2(Js::OpCode::NewScObjectNoCtorFull, thisForSuperCall, funcInfo->newTargetRegister); |
| this->Writer()->Br(Js::OpCode::Br, makeCallLabel); |
| |
| this->Writer()->MarkLabel(useNewTargetForThisLabel); |
| this->Writer()->Reg2(Js::OpCode::Ld_A, thisForSuperCall, funcInfo->newTargetRegister); |
| |
| this->Writer()->MarkLabel(makeCallLabel); |
| EmitCall(pnode, Js::Constants::NoRegister, this, funcInfo, fReturnValue, /*fEvaluateComponents*/ true, /*fHasNewTarget*/ true, thisForSuperCall); |
| |
| // We have to use another temp for the this value before assigning to this register. |
| // This is because IRBuilder does not expect us to use the value of a temp after potentially assigning to that same temp. |
| // Ex: |
| // _this = new.target; |
| // temp = super.call(_this); |
| // if (temp is object) { |
| // _this = temp; // creates a new sym for _this as it was previously used |
| // } |
| // this = _this; // tries to loads a value from the old sym (which is dead) |
| Js::RegSlot valueForThis = funcInfo->AcquireTmpRegister(); |
| |
| this->Writer()->BrReg1(Js::OpCode::BrOnObject_A, useSuperCallResultLabel, pnode->location); |
| this->Writer()->Reg2(Js::OpCode::Ld_A, valueForThis, thisForSuperCall); |
| this->Writer()->Br(Js::OpCode::Br, doneLabel); |
| this->Writer()->MarkLabel(useSuperCallResultLabel); |
| this->Writer()->Reg2(Js::OpCode::Ld_A, valueForThis, pnode->location); |
| this->Writer()->MarkLabel(doneLabel); |
| |
| // The call is done and we know what we will bind to 'this' so let's check to see if 'this' is already decl. |
| // We may need to load 'this' from the scope slot. |
| EmitScopeSlotLoadThis(funcInfo, funcInfo->thisPointerRegister, false); |
| |
| Js::ByteCodeLabel skipLabel = this->Writer()->DefineLabel(); |
| Js::RegSlot tmpUndeclReg = funcInfo->AcquireTmpRegister(); |
| this->Writer()->Reg1(Js::OpCode::InitUndecl, tmpUndeclReg); |
| this->Writer()->BrReg2(Js::OpCode::BrSrEq_A, skipLabel, funcInfo->thisPointerRegister, tmpUndeclReg); |
| funcInfo->ReleaseTmpRegister(tmpUndeclReg); |
| |
| this->Writer()->W1(Js::OpCode::RuntimeReferenceError, SCODE_CODE(JSERR_ClassThisAlreadyAssigned)); |
| this->Writer()->MarkLabel(skipLabel); |
| |
| this->Writer()->Reg2(Js::OpCode::StrictLdThis, funcInfo->thisPointerRegister, valueForThis); |
| funcInfo->ReleaseTmpRegister(valueForThis); |
| funcInfo->ReleaseTmpRegister(thisForSuperCall); |
| |
| // We already assigned the result of super() to the 'this' register but we need to store it in the scope slot, too. If there is one. |
| this->EmitScopeSlotStoreThis(funcInfo, nonLambdaFunc->thisScopeSlot); |
| } |
| |
| void ByteCodeGenerator::EmitClassConstructorEndCode(FuncInfo *funcInfo) |
| { |
| if (funcInfo->thisPointerRegister != Js::Constants::NoRegister) |
| { |
| // We need to try and load 'this' from the scope slot, if there is one. |
| EmitScopeSlotLoadThis(funcInfo, funcInfo->thisPointerRegister); |
| this->Writer()->Reg2(Js::OpCode::Ld_A, ByteCodeGenerator::ReturnRegister, funcInfo->thisPointerRegister); |
| } |
| else |
| { |
| // This is the case where we don't have any references to this or super in the constructor or any nested lambda functions. |
| // We know 'this' must be undecl so let's just emit the ReferenceError as part of the fallthrough. |
| EmitUseBeforeDeclarationRuntimeError(this, ByteCodeGenerator::ReturnRegister); |
| } |
| } |
| |
| void ByteCodeGenerator::EmitBaseClassConstructorThisObject(FuncInfo *funcInfo) |
| { |
| this->Writer()->Reg2(Js::OpCode::NewScObjectNoCtorFull, funcInfo->thisPointerRegister, funcInfo->newTargetRegister); |
| } |
| |
| void ByteCodeGenerator::EmitInternalScopedSlotLoad(FuncInfo *funcInfo, Js::RegSlot slot, Js::RegSlot symbolRegister, bool chkUndecl) |
| { |
| Scope* scope = nullptr; |
| |
| if (funcInfo->IsLambda()) |
| { |
| Js::PropertyId envIndex = -1; |
| GetEnclosingNonLambdaScope(funcInfo, scope, envIndex); |
| |
| EmitInternalScopedSlotLoad(funcInfo, scope, envIndex, slot, symbolRegister, chkUndecl); |
| } |
| else |
| { |
| scope = funcInfo->GetBodyScope(); |
| |
| EmitInternalScopedSlotLoad(funcInfo, scope, -1, slot, symbolRegister, chkUndecl); |
| } |
| } |
| |
| void ByteCodeGenerator::EmitInternalScopedSlotLoad(FuncInfo *funcInfo, Scope *scope, Js::PropertyId envIndex, Js::RegSlot slot, Js::RegSlot symbolRegister, bool chkUndecl) |
| { |
| Assert(slot != Js::Constants::NoProperty); |
| Js::ProfileId profileId = funcInfo->FindOrAddSlotProfileId(scope, symbolRegister); |
| Js::OpCode opcode; |
| |
| Js::RegSlot scopeLocation = scope->GetLocation(); |
| opcode = this->GetLdSlotOp(scope, envIndex, scopeLocation, funcInfo); |
| slot += (scope->GetIsObject() ? 0 : Js::ScopeSlots::FirstSlotIndex); |
| |
| if (envIndex != -1) |
| { |
| this->m_writer.SlotI2(opcode, symbolRegister, envIndex + Js::FrameDisplay::GetOffsetOfScopes()/sizeof(Js::Var), slot, profileId); |
| } |
| else if (scopeLocation != Js::Constants::NoRegister && |
| (scopeLocation == funcInfo->frameSlotsRegister || scopeLocation == funcInfo->frameObjRegister)) |
| { |
| this->m_writer.SlotI1(opcode, symbolRegister, slot, profileId); |
| } |
| else |
| { |
| this->m_writer.Slot(opcode, symbolRegister, scopeLocation, slot, profileId); |
| } |
| |
| if (chkUndecl) |
| { |
| this->m_writer.Reg1(Js::OpCode::ChkUndecl, symbolRegister); |
| } |
| } |
| |
| void ByteCodeGenerator::EmitInternalScopedSlotStore(FuncInfo *funcInfo, Js::RegSlot slot, Js::RegSlot symbolRegister) |
| { |
| Assert(slot != Js::Constants::NoProperty); |
| |
| Scope* scope = nullptr; |
| Js::OpCode opcode; |
| |
| Js::PropertyId envIndex = -1; |
| if (funcInfo->IsLambda()) |
| { |
| GetEnclosingNonLambdaScope(funcInfo, scope, envIndex); |
| } |
| else |
| { |
| scope = funcInfo->GetBodyScope(); |
| } |
| |
| Js::RegSlot scopeLocation = scope->GetLocation(); |
| opcode = this->GetStSlotOp(scope, envIndex, scopeLocation, false, funcInfo); |
| slot += (scope->GetIsObject() ? 0 : Js::ScopeSlots::FirstSlotIndex); |
| |
| if (envIndex != -1) |
| { |
| this->m_writer.SlotI2(opcode, symbolRegister, envIndex + Js::FrameDisplay::GetOffsetOfScopes()/sizeof(Js::Var), slot); |
| } |
| else if (scopeLocation != Js::Constants::NoRegister && |
| (scopeLocation == funcInfo->frameSlotsRegister || scopeLocation == funcInfo->frameObjRegister)) |
| { |
| this->m_writer.SlotI1(opcode, symbolRegister, slot); |
| } |
| else if (scope->GetIsObject()) |
| { |
| this->m_writer.Slot(opcode, symbolRegister, scopeLocation, slot); |
| } |
| else |
| { |
| this->m_writer.SlotI2(opcode, symbolRegister, scope->GetInnerScopeIndex(), slot); |
| } |
| } |
| |
| void ByteCodeGenerator::EmitInternalScopeObjInit(FuncInfo *funcInfo, Scope *scope, Js::RegSlot valueLocation, Js::PropertyId propertyId) |
| { |
| Js::RegSlot scopeLocation = scope->GetLocation(); |
| Js::OpCode opcode = this->GetInitFldOp(scope, scopeLocation, funcInfo); |
| if (scopeLocation != Js::Constants::NoRegister && scopeLocation == funcInfo->frameObjRegister) |
| { |
| uint cacheId = funcInfo->FindOrAddInlineCacheId(scopeLocation, propertyId, false, true); |
| this->m_writer.ElementP(opcode, valueLocation, cacheId); |
| } |
| else if (scope->HasInnerScopeIndex()) |
| { |
| uint cacheId = funcInfo->FindOrAddInlineCacheId(funcInfo->InnerScopeToRegSlot(scope), propertyId, false, true); |
| this->m_writer.ElementPIndexed(opcode, valueLocation, scope->GetInnerScopeIndex(), cacheId); |
| } |
| else |
| { |
| uint cacheId = funcInfo->FindOrAddInlineCacheId(scopeLocation, propertyId, false, true); |
| this->m_writer.PatchableProperty(opcode, valueLocation, scopeLocation, cacheId); |
| } |
| } |
| |
| void ByteCodeGenerator::GetEnclosingNonLambdaScope(FuncInfo *funcInfo, Scope * &scope, Js::PropertyId &envIndex) |
| { |
| Assert(funcInfo->IsLambda()); |
| envIndex = -1; |
| for (scope = GetCurrentScope(); scope; scope = scope->GetEnclosingScope()) |
| { |
| if (scope->GetMustInstantiate() && scope->GetFunc() != funcInfo) |
| { |
| envIndex++; |
| } |
| if (((scope == scope->GetFunc()->GetBodyScope() || scope == scope->GetFunc()->GetParamScope()) && !scope->GetFunc()->IsLambda()) || scope->IsGlobalEvalBlockScope()) |
| { |
| break; |
| } |
| } |
| } |
| |
| void ByteCodeGenerator::EmitThis(FuncInfo *funcInfo, Js::RegSlot fromRegister) |
| { |
| if (funcInfo->IsLambda()) |
| { |
| Scope *scope; |
| Js::PropertyId envIndex = -1; |
| GetEnclosingNonLambdaScope(funcInfo, scope, envIndex); |
| FuncInfo* parent = scope->GetFunc(); |
| |
| if (parent->IsGlobalFunction()) |
| { |
| if (this->flags & fscrEval) |
| { |
| scope = parent->GetGlobalEvalBlockScope(); |
| Js::PropertyId slot = parent->thisScopeSlot; |
| EmitInternalScopedSlotLoad(funcInfo, scope, envIndex, slot, funcInfo->thisPointerRegister, false); |
| } |
| else |
| { |
| // Always load global object via LdThis of null to get the possibly protected via secureHostObject global object. |
| this->m_writer.Reg2Int1(Js::OpCode::LdThis, funcInfo->thisPointerRegister, funcInfo->nullConstantRegister, this->GetModuleID()); |
| } |
| } |
| else if (!parent->IsClassConstructor() || parent->IsBaseClassConstructor()) |
| { |
| // In a lambda inside a derived class constructor, 'this' should be loaded from the scope slot whenever 'this' is accessed. |
| // It's safe to load 'this' into the register for base class constructors because there is no complex assignment to 'this' |
| // via super call chain. |
| Js::PropertyId slot = parent->thisScopeSlot; |
| EmitInternalScopedSlotLoad(funcInfo, scope, envIndex, slot, funcInfo->thisPointerRegister, false); |
| } |
| } |
| else if (funcInfo->byteCodeFunction->GetIsStrictMode() && (!funcInfo->IsGlobalFunction() || this->flags & fscrEval)) |
| { |
| m_writer.Reg2(Js::OpCode::StrictLdThis, funcInfo->thisPointerRegister, fromRegister); |
| } |
| else |
| { |
| m_writer.Reg2Int1(Js::OpCode::LdThis, funcInfo->thisPointerRegister, fromRegister, this->GetModuleID()); |
| } |
| } |
| |
| void ByteCodeGenerator::EmitLoadFormalIntoRegister(ParseNode *pnodeFormal, Js::RegSlot pos, FuncInfo *funcInfo) |
| { |
| if (pnodeFormal->IsVarLetOrConst()) |
| { |
| // Get the param from its argument position into its assigned register. |
| // The position should match the location, otherwise, it has been shadowed by parameter with the same name |
| Symbol *formal = pnodeFormal->sxVar.sym; |
| if (formal->GetLocation() + 1 == pos) |
| { |
| // Transfer to the frame object, etc., if necessary. |
| this->EmitLocalPropInit(formal->GetLocation(), formal, funcInfo); |
| } |
| |
| if (ShouldTrackDebuggerMetadata() && !formal->IsInSlot(funcInfo)) |
| { |
| Assert(!formal->GetHasInit()); |
| funcInfo->GetParsedFunctionBody()->InsertSymbolToRegSlotList(formal->GetName(), formal->GetLocation(), funcInfo->varRegsCount); |
| } |
| } |
| } |
| |
| void ByteCodeGenerator::HomeArguments(FuncInfo *funcInfo) |
| { |
| // Transfer formal parameters to their home locations on the local frame. |
| if (funcInfo->GetHasArguments()) |
| { |
| if (funcInfo->root->sxFnc.pnodeRest != nullptr) |
| { |
| // Since we don't have to iterate over arguments here, we'll trust the location to be correct. |
| EmitLoadFormalIntoRegister(funcInfo->root->sxFnc.pnodeRest, funcInfo->root->sxFnc.pnodeRest->sxVar.sym->GetLocation() + 1, funcInfo); |
| } |
| |
| // The arguments object creation helper does this work for us. |
| return; |
| } |
| |
| Js::ArgSlot pos = 1; |
| auto loadFormal = [&](ParseNode *pnodeFormal) |
| { |
| EmitLoadFormalIntoRegister(pnodeFormal, pos, funcInfo); |
| pos++; |
| }; |
| MapFormals(funcInfo->root, loadFormal); |
| } |
| |
| void ByteCodeGenerator::DefineLabels(FuncInfo *funcInfo) |
| { |
| funcInfo->singleExit = m_writer.DefineLabel(); |
| SList<ParseNode *>::Iterator iter(&funcInfo->targetStatements); |
| while (iter.Next()) |
| { |
| ParseNode * node = iter.Data(); |
| node->sxStmt.breakLabel = m_writer.DefineLabel(); |
| node->sxStmt.continueLabel = m_writer.DefineLabel(); |
| node->emitLabels = true; |
| } |
| } |
| |
| void ByteCodeGenerator::EmitGlobalBody(FuncInfo *funcInfo) |
| { |
| // Emit global code (global scope or eval), fixing up the return register with the implicit |
| // return value. |
| ParseNode *pnode = funcInfo->root->sxFnc.pnodeBody; |
| ParseNode *pnodeLastVal = funcInfo->root->sxProg.pnodeLastValStmt; |
| if (pnodeLastVal == nullptr) |
| { |
| // We're not guaranteed to compute any values, so fix up the return register at the top |
| // in case. |
| this->m_writer.Reg1(Js::OpCode::LdUndef, ReturnRegister); |
| } |
| |
| while (pnode->nop == knopList) |
| { |
| ParseNode *stmt = pnode->sxBin.pnode1; |
| if (stmt == pnodeLastVal) |
| { |
| pnodeLastVal = nullptr; |
| } |
| if (pnodeLastVal == nullptr && (this->flags & fscrReturnExpression)) |
| { |
| EmitTopLevelStatement(stmt, funcInfo, true); |
| } |
| else |
| { |
| // Haven't hit the post-dominating return value yet, |
| // so don't bother with the return register. |
| EmitTopLevelStatement(stmt, funcInfo, false); |
| } |
| pnode = pnode->sxBin.pnode2; |
| } |
| EmitTopLevelStatement(pnode, funcInfo, false); |
| } |
| |
| void ByteCodeGenerator::EmitFunctionBody(FuncInfo *funcInfo) |
| { |
| // Emit a function body. Only explicit returns and the implicit "undef" at the bottom |
| // get copied to the return register. |
| ParseNode *pnodeBody = funcInfo->root->sxFnc.pnodeBody; |
| ParseNode *pnode = pnodeBody; |
| while (pnode->nop == knopList) |
| { |
| ParseNode *stmt = pnode->sxBin.pnode1; |
| if (stmt->CapturesSyms()) |
| { |
| CapturedSymMap *map = funcInfo->EnsureCapturedSymMap(); |
| SList<Symbol*> *list = map->Item(stmt); |
| FOREACH_SLIST_ENTRY(Symbol*, sym, list) |
| { |
| if (!sym->GetIsCommittedToSlot()) |
| { |
| Assert(sym->GetLocation() != Js::Constants::NoProperty); |
| sym->SetIsCommittedToSlot(); |
| ParseNode *decl = sym->GetDecl(); |
| Assert(decl); |
| if (PHASE_TRACE(Js::DelayCapturePhase, funcInfo->byteCodeFunction)) |
| { |
| Output::Print(_u("--- DelayCapture: Committed symbol '%s' to slot.\n"), sym->GetName()); |
| Output::Flush(); |
| } |
| // REVIEW[ianhall]: HACK to work around this causing an error due to sym not yet being initialized |
| // what is this doing? Why are we assigning sym to itself? |
| bool old = sym->GetNeedDeclaration(); |
| sym->SetNeedDeclaration(false); |
| this->EmitPropStore(sym->GetLocation(), sym, sym->GetPid(), funcInfo, decl->nop == knopLetDecl, decl->nop == knopConstDecl); |
| sym->SetNeedDeclaration(old); |
| } |
| } |
| NEXT_SLIST_ENTRY; |
| } |
| EmitTopLevelStatement(stmt, funcInfo, false); |
| pnode = pnode->sxBin.pnode2; |
| } |
| Assert(!pnode->CapturesSyms()); |
| EmitTopLevelStatement(pnode, funcInfo, false); |
| } |
| |
| void ByteCodeGenerator::EmitProgram(ParseNode *pnodeProg) |
| { |
| // Indicate that the binding phase is over. |
| this->isBinding = false; |
| this->trackEnvDepth = true; |
| AssignPropertyIds(pnodeProg->sxFnc.funcInfo->byteCodeFunction); |
| |
| long initSize = this->maxAstSize / AstBytecodeRatioEstimate; |
| |
| // Use the temp allocator in bytecode write temp buffer. |
| m_writer.InitData(this->alloc, initSize); |
| |
| #ifdef LOG_BYTECODE_AST_RATIO |
| // log the max Ast size |
| Output::Print(_u("Max Ast size: %d"), initSize); |
| #endif |
| |
| Assert(pnodeProg && pnodeProg->nop == knopProg); |
| |
| if (this->parentScopeInfo) |
| { |
| // Scope stack is already set up the way we want it, so don't visit the global scope. |
| // Start emitting with the nested scope (i.e., the deferred function). |
| this->EmitScopeList(pnodeProg->sxProg.pnodeScopes); |
| } |
| else |
| { |
| this->EmitScopeList(pnodeProg); |
| } |
| } |
| |
| void ByteCodeGenerator::EmitInitCapturedThis(FuncInfo* funcInfo, Scope* scope) |
| { |
| if (scope->GetIsObject()) |
| { |
| // Ensure space for the this slot |
| this->EmitInternalScopeObjInit(funcInfo, scope, funcInfo->thisPointerRegister, Js::PropertyIds::_lexicalThisSlotSymbol); |
| } |
| else |
| { |
| this->EmitInternalScopedSlotStore(funcInfo, funcInfo->thisScopeSlot, funcInfo->thisPointerRegister); |
| } |
| } |
| |
| void ByteCodeGenerator::EmitInitCapturedNewTarget(FuncInfo* funcInfo, Scope* scope) |
| { |
| if (scope->GetIsObject()) |
| { |
| // Ensure space for the new.target slot |
| this->EmitInternalScopeObjInit(funcInfo, scope, funcInfo->newTargetRegister, Js::PropertyIds::_lexicalNewTargetSymbol); |
| } |
| else |
| { |
| this->EmitInternalScopedSlotStore(funcInfo, funcInfo->newTargetScopeSlot, funcInfo->newTargetRegister); |
| } |
| } |
| |
| void EmitDestructuredObject(ParseNode *lhs, Js::RegSlot rhsLocation, ByteCodeGenerator *byteCodeGenerator, FuncInfo *funcInfo); |
| void EmitDestructuredValueOrInitializer(ParseNodePtr lhsElementNode, Js::RegSlot rhsLocation, ParseNodePtr initializer, ByteCodeGenerator *byteCodeGenerator, FuncInfo *funcInfo); |
| |
| void ByteCodeGenerator::PopulateFormalsScope(uint beginOffset, FuncInfo *funcInfo, ParseNode *pnode) |
| { |
| Js::DebuggerScope *debuggerScope = nullptr; |
| auto processArg = [&](ParseNode *pnodeArg) { |
| if (pnodeArg->IsVarLetOrConst()) |
| { |
| if (debuggerScope == nullptr) |
| { |
| debuggerScope = RecordStartScopeObject(pnode, funcInfo->paramScope && funcInfo->paramScope->GetIsObject() ? Js::DiagParamScopeInObject : Js::DiagParamScope); |
| debuggerScope->SetBegin(beginOffset); |
| } |
| |
| debuggerScope->AddProperty(pnodeArg->sxVar.sym->GetLocation(), pnodeArg->sxVar.sym->EnsurePosition(funcInfo), Js::DebuggerScopePropertyFlags_None); |
| } |
| }; |
| |
| MapFormals(pnode, processArg); |
| MapFormalsFromPattern(pnode, processArg); |
| |
| if (debuggerScope != nullptr) |
| { |
| RecordEndScopeObject(pnode); |
| } |
| } |
| |
| void ByteCodeGenerator::EmitDefaultArgs(FuncInfo *funcInfo, ParseNode *pnode) |
| { |
| uint beginOffset = m_writer.GetCurrentOffset(); |
| |
| auto emitDefaultArg = [&](ParseNode *pnodeArg) |
| { |
| if (pnodeArg->nop == knopParamPattern) |
| { |
| this->StartStatement(pnodeArg); |
| |
| Assert(pnodeArg->sxParamPattern.location != Js::Constants::NoRegister); |
| ParseNodePtr pnode1 = pnodeArg->sxParamPattern.pnode1; |
| |
| if (pnode1->IsPattern()) |
| { |
| EmitAssignment(nullptr, pnode1, pnodeArg->sxParamPattern.location, this, funcInfo); |
| } |
| else |
| { |
| Assert(pnode1->nop == knopAsg); |
| Assert(pnode1->sxBin.pnode1->IsPattern()); |
| EmitDestructuredValueOrInitializer(pnode1->sxBin.pnode1, pnodeArg->sxParamPattern.location, pnode1->sxBin.pnode2, this, funcInfo); |
| } |
| this->EndStatement(pnodeArg); |
| return; |
| } |
| else if (pnodeArg->IsVarLetOrConst()) |
| { |
| Js::RegSlot location = pnodeArg->sxVar.sym->GetLocation(); |
| |
| if (pnodeArg->sxVar.pnodeInit == nullptr) |
| { |
| // Since the formal hasn't been initialized in LdLetHeapArguments, we'll initialize it here. |
| pnodeArg->sxVar.sym->SetNeedDeclaration(false); |
| EmitPropStore(location, pnodeArg->sxVar.sym, pnodeArg->sxVar.pid, funcInfo, true); |
| |
| return; |
| } |
| |
| // Load the default argument if we got undefined, skip RHS evaluation otherwise. |
| Js::ByteCodeLabel noDefaultLabel = this->m_writer.DefineLabel(); |
| Js::ByteCodeLabel endLabel = this->m_writer.DefineLabel(); |
| this->StartStatement(pnodeArg); |
| // Let us use strict not equal to differentiate between null and undefined |
| m_writer.BrReg2(Js::OpCode::BrSrNeq_A, noDefaultLabel, location, funcInfo->undefinedConstantRegister); |
| |
| Emit(pnodeArg->sxVar.pnodeInit, this, funcInfo, false); |
| pnodeArg->sxVar.sym->SetNeedDeclaration(false); // After emit to prevent foo(a = a) |
| |
| if (funcInfo->GetHasArguments() && pnodeArg->sxVar.sym->IsInSlot(funcInfo)) |
| { |
| EmitPropStore(pnodeArg->sxVar.pnodeInit->location, pnodeArg->sxVar.sym, pnodeArg->sxVar.pid, funcInfo, true); |
| |
| m_writer.Br(endLabel); |
| } |
| else |
| { |
| EmitAssignment(nullptr, pnodeArg, pnodeArg->sxVar.pnodeInit->location, this, funcInfo); |
| } |
| |
| funcInfo->ReleaseLoc(pnodeArg->sxVar.pnodeInit); |
| |
| m_writer.MarkLabel(noDefaultLabel); |
| |
| if (funcInfo->GetHasArguments() && pnodeArg->sxVar.sym->IsInSlot(funcInfo)) |
| { |
| EmitPropStore(location, pnodeArg->sxVar.sym, pnodeArg->sxVar.pid, funcInfo, true); |
| |
| m_writer.MarkLabel(endLabel); |
| } |
| |
| this->EndStatement(pnodeArg); |
| } |
| }; |
| |
| // If the function is async, we wrap the default arguments in a try catch and reject a Promise in case of error. |
| if (pnode->sxFnc.IsAsync()) |
| { |
| uint cacheId; |
| Js::ByteCodeLabel catchLabel = m_writer.DefineLabel(); |
| Js::ByteCodeLabel doneLabel = m_writer.DefineLabel(); |
| Js::RegSlot catchArgLocation = funcInfo->AcquireTmpRegister(); |
| Js::RegSlot promiseLocation = funcInfo->AcquireTmpRegister(); |
| Js::RegSlot rejectLocation = funcInfo->AcquireTmpRegister(); |
| |
| // try |
| m_writer.RecordCrossFrameEntryExitRecord(/* isEnterBlock = */ true); |
| m_writer.Br(Js::OpCode::TryCatch, catchLabel); |
| |
| // Rest cannot have a default argument, so we ignore it. |
| MapFormalsWithoutRest(pnode, emitDefaultArg); |
| |
| m_writer.RecordCrossFrameEntryExitRecord(/* isEnterBlock = */ false); |
| m_writer.Empty(Js::OpCode::Leave); |
| m_writer.Br(doneLabel); |
| |
| // catch |
| m_writer.MarkLabel(catchLabel); |
| m_writer.Reg1(Js::OpCode::Catch, catchArgLocation); |
| |
| m_writer.RecordCrossFrameEntryExitRecord(/* isEnterBlock = */ true); |
| m_writer.Empty(Js::OpCode::Nop); |
| |
| // return Promise.reject(error); |
| cacheId = funcInfo->FindOrAddRootObjectInlineCacheId(Js::PropertyIds::Promise, false, false); |
| m_writer.PatchableRootProperty(Js::OpCode::LdRootFld, promiseLocation, cacheId, false, false); |
| |
| EmitInvoke(rejectLocation, promiseLocation, Js::PropertyIds::reject, this, funcInfo, catchArgLocation); |
| |
| m_writer.Reg2(Js::OpCode::Ld_A, ByteCodeGenerator::ReturnRegister, rejectLocation); |
| |
| m_writer.RecordCrossFrameEntryExitRecord(/* isEnterBlock = */ false); |
| m_writer.Empty(Js::OpCode::Leave); |
| m_writer.Br(funcInfo->singleExit); |
| m_writer.Empty(Js::OpCode::Leave); |
| |
| m_writer.MarkLabel(doneLabel); |
| |
| this->SetHasTry(true); |
| |
| funcInfo->ReleaseTmpRegister(rejectLocation); |
| funcInfo->ReleaseTmpRegister(promiseLocation); |
| funcInfo->ReleaseTmpRegister(catchArgLocation); |
| } |
| else |
| { |
| // Rest cannot have a default argument, so we ignore it. |
| MapFormalsWithoutRest(pnode, emitDefaultArg); |
| } |
| |
| if (m_writer.GetCurrentOffset() > beginOffset) |
| { |
| PopulateFormalsScope(beginOffset, funcInfo, pnode); |
| } |
| } |
| |
| void ByteCodeGenerator::EmitOneFunction(ParseNode *pnode) |
| { |
| Assert(pnode && (pnode->nop == knopProg || pnode->nop == knopFncDecl)); |
| FuncInfo *funcInfo = pnode->sxFnc.funcInfo; |
| Assert(funcInfo != nullptr); |
| |
| if (funcInfo->IsFakeGlobalFunction(this->flags)) |
| { |
| return; |
| } |
| |
| Js::ParseableFunctionInfo* deferParseFunction = funcInfo->byteCodeFunction; |
| deferParseFunction->SetGrfscr(deferParseFunction->GetGrfscr() | (this->flags & ~fscrDeferredFncExpression)); |
| deferParseFunction->SetSourceInfo(this->GetCurrentSourceIndex(), |
| funcInfo->root, |
| !!(this->flags & fscrEvalCode), |
| ((this->flags & fscrDynamicCode) && !(this->flags & fscrEvalCode))); |
| |
| deferParseFunction->SetInParamsCount(funcInfo->inArgsCount); |
| if (pnode->sxFnc.HasDefaultArguments()) |
| { |
| deferParseFunction->SetReportedInParamsCount(pnode->sxFnc.firstDefaultArg + 1); |
| } |
| else |
| { |
| deferParseFunction->SetReportedInParamsCount(funcInfo->inArgsCount); |
| } |
| |
| if (funcInfo->root->sxFnc.pnodeBody == nullptr) |
| { |
| if (!PHASE_OFF1(Js::SkipNestedDeferredPhase)) |
| { |
| deferParseFunction->BuildDeferredStubs(funcInfo->root); |
| } |
| return; |
| } |
| |
| Js::FunctionBody* byteCodeFunction = funcInfo->GetParsedFunctionBody(); |
| // We've now done a full parse of this function, so we no longer need to remember the extents |
| // and attributes of the top-level nested functions. (The above code has run for all of those, |
| // so they have pointers to the stub sub-trees they need.) |
| byteCodeFunction->SetDeferredStubs(nullptr); |
| |
| try |
| { |
| // Bug : 301517 |
| // In the debug mode the hasOnlyThis optimization needs to be disabled, since user can break in this function |
| // and do operation on 'this' and its property, which may not be defined yet. |
| if (funcInfo->root->sxFnc.HasOnlyThisStmts() && !IsInDebugMode()) |
| { |
| byteCodeFunction->SetHasOnlyThisStmts(true); |
| } |
| |
| if (byteCodeFunction->IsInlineApplyDisabled() || this->scriptContext->GetConfig()->IsNoNative()) |
| { |
| if ((pnode->nop == knopFncDecl) && (funcInfo->GetHasHeapArguments()) && (!funcInfo->GetCallsEval()) && ApplyEnclosesArgs(pnode, this)) |
| { |
| bool applyEnclosesArgs = true; |
| for (ParseNode* pnodeVar = funcInfo->root->sxFnc.pnodeVars; pnodeVar; pnodeVar = pnodeVar->sxVar.pnodeNext) |
| { |
| Symbol* sym = pnodeVar->sxVar.sym; |
| if (sym->GetSymbolType() == STVariable && !sym->GetIsArguments()) |
| { |
| applyEnclosesArgs = false; |
| break; |
| } |
| } |
| auto constAndLetCheck = [](ParseNode *pnodeBlock, bool *applyEnclosesArgs) |
| { |
| if (*applyEnclosesArgs) |
| { |
| for (auto lexvar = pnodeBlock->sxBlock.pnodeLexVars; lexvar; lexvar = lexvar->sxVar.pnodeNext) |
| { |
| Symbol* sym = lexvar->sxVar.sym; |
| if (sym->GetSymbolType() == STVariable && !sym->GetIsArguments()) |
| { |
| *applyEnclosesArgs = false; |
| break; |
| } |
| } |
| } |
| }; |
| constAndLetCheck(funcInfo->root->sxFnc.pnodeScopes, &applyEnclosesArgs); |
| constAndLetCheck(funcInfo->root->sxFnc.pnodeBodyScope, &applyEnclosesArgs); |
| funcInfo->SetApplyEnclosesArgs(applyEnclosesArgs); |
| } |
| } |
| |
| if (!funcInfo->IsGlobalFunction()) |
| { |
| if (CanStackNestedFunc(funcInfo, true)) |
| { |
| #if DBG |
| byteCodeFunction->SetCanDoStackNestedFunc(); |
| #endif |
| if (funcInfo->root->sxFnc.astSize <= PnFnc::MaxStackClosureAST) |
| { |
| byteCodeFunction->SetStackNestedFunc(true); |
| } |
| } |
| } |
| |
| InitScopeSlotArray(funcInfo); |
| FinalizeRegisters(funcInfo, byteCodeFunction); |
| DebugOnly(Js::RegSlot firstTmpReg = funcInfo->varRegsCount); |
| |
| // Reserve temp registers for the inner scopes. We prefer temps because the JIT will then renumber them |
| // and see different lifetimes. (Note that debug mode requires permanent registers. See FinalizeRegisters.) |
| uint innerScopeCount = funcInfo->InnerScopeCount(); |
| if (!this->IsInDebugMode()) |
| { |
| byteCodeFunction->SetInnerScopeCount(innerScopeCount); |
| if (innerScopeCount) |
| { |
| funcInfo->SetFirstInnerScopeReg(funcInfo->AcquireTmpRegister()); |
| for (uint i = 1; i < innerScopeCount; i++) |
| { |
| funcInfo->AcquireTmpRegister(); |
| } |
| } |
| } |
| |
| funcInfo->inlineCacheMap = Anew(alloc, FuncInfo::InlineCacheMap, |
| alloc, |
| funcInfo->RegCount() // Pass the actual register count. // TODO: Check if we can reduce this count |
| ); |
| funcInfo->rootObjectLoadInlineCacheMap = Anew(alloc, FuncInfo::RootObjectInlineCacheIdMap, |
| alloc, |
| 10); |
| funcInfo->rootObjectLoadMethodInlineCacheMap = Anew(alloc, FuncInfo::RootObjectInlineCacheIdMap, |
| alloc, |
| 10); |
| funcInfo->rootObjectStoreInlineCacheMap = Anew(alloc, FuncInfo::RootObjectInlineCacheIdMap, |
| alloc, |
| 10); |
| funcInfo->referencedPropertyIdToMapIndex = Anew(alloc, FuncInfo::RootObjectInlineCacheIdMap, |
| alloc, |
| 10); |
| |
| byteCodeFunction->AllocateLiteralRegexArray(); |
| m_callSiteId = 0; |
| m_writer.Begin(this, byteCodeFunction, alloc, this->DoJitLoopBodies(funcInfo), funcInfo->hasLoop); |
| this->PushFuncInfo(_u("EmitOneFunction"), funcInfo); |
| |
| this->inPrologue = true; |
| |
| // Class constructors do not have a [[call]] slot but we don't implement a generic way to express this. |
| // What we do is emit a check for the new flag here. If we don't have CallFlags_New set, the opcode will throw. |
| // We need to do this before emitting 'this' since the base class constructor will try to construct a new object. |
| if (funcInfo->IsClassConstructor()) |
| { |
| m_writer.Empty(Js::OpCode::ChkNewCallFlag); |
| } |
| |
| // For now, emit all constant loads at top of function (should instead put in closest dominator of uses). |
| LoadAllConstants(funcInfo); |
| Scope* paramScope = funcInfo->GetParamScope(); |
| if (!pnode->sxFnc.HasNonSimpleParameterList() || paramScope->GetCanMergeWithBodyScope()) |
| { |
| HomeArguments(funcInfo); |
| } |
| |
| if (funcInfo->root->sxFnc.pnodeRest != nullptr) |
| { |
| byteCodeFunction->SetHasRestParameter(); |
| } |
| |
| if (funcInfo->thisScopeSlot != Js::Constants::NoRegister && !(funcInfo->IsLambda() || (funcInfo->IsGlobalFunction() && this->flags & fscrEval))) |
| { |
| EmitInitCapturedThis(funcInfo, funcInfo->bodyScope); |
| } |
| |
| // Any function with a super reference or an eval call inside a class method needs to load super, |
| if ((funcInfo->HasSuperReference() || (funcInfo->GetCallsEval() && funcInfo->root->sxFnc.IsClassMember())) |
| // unless we are already inside the 'global' scope inside an eval (in which case 'ScopedLdSuper' is emitted at every 'super' reference). |
| && !((GetFlags() & fscrEval) && funcInfo->IsGlobalFunction())) |
| { |
| if (funcInfo->IsLambda()) |
| { |
| Scope *scope; |
| Js::PropertyId envIndex = -1; |
| GetEnclosingNonLambdaScope(funcInfo, scope, envIndex); |
| |
| FuncInfo* parent = scope->GetFunc(); |
| |
| if (!parent->IsGlobalFunction()) |
| { |
| // lambda in non-global scope (eval and non-eval) |
| EmitInternalScopedSlotLoad(funcInfo, scope, envIndex, parent->superScopeSlot, funcInfo->superRegister); |
| if (funcInfo->superCtorRegister != Js::Constants::NoRegister) |
| { |
| EmitInternalScopedSlotLoad(funcInfo, scope, envIndex, parent->superCtorScopeSlot, funcInfo->superCtorRegister); |
| } |
| } |
| else if (!(GetFlags() & fscrEval)) |
| { |
| // lambda in non-eval global scope |
| m_writer.Reg1(Js::OpCode::LdUndef, funcInfo->superRegister); |
| } |
| // lambda in eval global scope: ScopedLdSuper will handle error throwing |
| } |
| else |
| { |
| m_writer.Reg1(Js::OpCode::LdSuper, funcInfo->superRegister); |
| |
| if (funcInfo->superCtorRegister != Js::Constants::NoRegister) // super() is allowed only in derived class constructors |
| { |
| m_writer.Reg1(Js::OpCode::LdSuperCtor, funcInfo->superCtorRegister); |
| } |
| |
| if (!funcInfo->IsGlobalFunction()) |
| { |
| if (funcInfo->bodyScope->GetIsObject() && funcInfo->bodyScope->GetLocation() != Js::Constants::NoRegister) |
| { |
| // Stash the super reference in case something inside the eval or lambda references it. |
| uint cacheId = funcInfo->FindOrAddInlineCacheId(funcInfo->bodyScope->GetLocation(), Js::PropertyIds::_superReferenceSymbol, false, true); |
| m_writer.ElementP(Js::OpCode::InitLocalFld, funcInfo->superRegister, cacheId); |
| if (funcInfo->superCtorRegister != Js::Constants::NoRegister) |
| { |
| cacheId = funcInfo->FindOrAddInlineCacheId(funcInfo->bodyScope->GetLocation(), Js::PropertyIds::_superCtorReferenceSymbol, false, true); |
| m_writer.ElementP(Js::OpCode::InitLocalFld, funcInfo->superCtorRegister, cacheId); |
| } |
| } |
| else if (funcInfo->superScopeSlot == Js::Constants::NoProperty || funcInfo->superCtorScopeSlot == Js::Constants::NoProperty) |
| { |
| // While the diag locals walker will pick up super from scoped slots or an activation object, |
| // it will not pick it up when it is only in a register. |
| byteCodeFunction->InsertSymbolToRegSlotList(funcInfo->superRegister, Js::PropertyIds::_superReferenceSymbol, funcInfo->varRegsCount); |
| if (funcInfo->superCtorRegister != Js::Constants::NoRegister) |
| { |
| byteCodeFunction->InsertSymbolToRegSlotList(funcInfo->superCtorRegister, Js::PropertyIds::_superCtorReferenceSymbol, funcInfo->varRegsCount); |
| } |
| } |
| } |
| } |
| } |
| |
| if (funcInfo->newTargetScopeSlot != Js::Constants::NoRegister && !funcInfo->IsGlobalFunction()) |
| { |
| EmitInitCapturedNewTarget(funcInfo, funcInfo->bodyScope); |
| } |
| |
| // We don't want to load super if we are already in an eval. ScopedLdSuper will take care of loading super in that case. |
| if (!(GetFlags() & fscrEval) && !funcInfo->bodyScope->GetIsObject()) |
| { |
| if (funcInfo->superScopeSlot != Js::Constants::NoRegister) |
| { |
| this->EmitInternalScopedSlotStore(funcInfo, funcInfo->superScopeSlot, funcInfo->superRegister); |
| } |
| |
| if (funcInfo->superCtorScopeSlot != Js::Constants::NoRegister) |
| { |
| this->EmitInternalScopedSlotStore(funcInfo, funcInfo->superCtorScopeSlot, funcInfo->superCtorRegister); |
| } |
| } |
| |
| if (byteCodeFunction->DoStackNestedFunc()) |
| { |
| uint nestedCount = byteCodeFunction->GetNestedCount(); |
| for (uint i = 0; i < nestedCount; i++) |
| { |
| Js::FunctionProxy * nested = byteCodeFunction->GetNestedFunc(i); |
| if (nested->IsFunctionBody()) |
| { |
| nested->GetFunctionBody()->SetStackNestedFuncParent(byteCodeFunction); |
| } |
| } |
| } |
| |
| if (funcInfo->IsGlobalFunction()) |
| { |
| EnsureNoRedeclarations(pnode->sxFnc.pnodeScopes, funcInfo); |
| } |
| |
| ::BeginEmitBlock(pnode->sxFnc.pnodeScopes, this, funcInfo); |
| |
| DefineLabels(funcInfo); |
| |
| if (pnode->sxFnc.HasNonSimpleParameterList()) |
| { |
| this->InitBlockScopedNonTemps(funcInfo->root->sxFnc.pnodeScopes, funcInfo); |
| |
| Scope* bodyScope = funcInfo->GetBodyScope(); |
| if (!paramScope->GetCanMergeWithBodyScope()) |
| { |
| byteCodeFunction->SetParamAndBodyScopeNotMerged(); |
| |
| HomeArguments(funcInfo); |
| |
| // Pop the body scope before emitting the default args |
| PopScope(); |
| Assert(this->GetCurrentScope() == paramScope); |
| |
| funcInfo->SetCurrentChildScope(paramScope); |
| } |
| |
| EmitDefaultArgs(funcInfo, pnode); |
| |
| if (!paramScope->GetCanMergeWithBodyScope()) |
| { |
| Assert(this->GetCurrentScope() == paramScope); |
| // Push the body scope |
| PushScope(bodyScope); |
| |
| funcInfo->SetCurrentChildScope(bodyScope); |
| |
| // Mark the beginning of the body scope so that new scope slots can be created. |
| this->Writer()->Empty(Js::OpCode::BeginBodyScope); |
| } |
| } |
| |
| // Emit all scope-wide function definitions before emitting function bodies |
| // so that calls may reference functions they precede lexically. |
| // Note, global eval scope is a fake local scope and is handled as if it were |
| // a lexical block instead of a true global scope, so do not define the functions |
| // here. They will be defined during BeginEmitBlock. |
| if (!(funcInfo->IsGlobalFunction() && this->IsEvalWithNoParentScopeInfo())) |
| { |
| // This only handles function declarations, which param scope cannot have any. |
| DefineFunctions(funcInfo); |
| } |
| |
| InitSpecialScopeSlots(funcInfo); |
| |
| DefineUserVars(funcInfo); |
| |
| if (pnode->sxFnc.HasNonSimpleParameterList()) |
| { |
| this->InitBlockScopedNonTemps(funcInfo->root->sxFnc.pnodeBodyScope, funcInfo); |
| } |
| else |
| { |
| this->InitBlockScopedNonTemps(funcInfo->root->sxFnc.pnodeScopes, funcInfo); |
| } |
| |
| if (!pnode->sxFnc.HasNonSimpleParameterList() && funcInfo->GetHasArguments() && !NeedScopeObjectForArguments(funcInfo, pnode)) |
| { |
| // If we didn't create a scope object and didn't have default args, we still need to transfer the formals to their slots. |
| MapFormalsWithoutRest(pnode, [&](ParseNode *pnodeArg) { EmitPropStore(pnodeArg->sxVar.sym->GetLocation(), pnodeArg->sxVar.sym, pnodeArg->sxVar.pid, funcInfo); }); |
| } |
| |
| // Rest needs to trigger use before declaration until all default args have been processed. |
| if (pnode->sxFnc.pnodeRest != nullptr) |
| { |
| pnode->sxFnc.pnodeRest->sxVar.sym->SetNeedDeclaration(false); |
| } |
| |
| if (paramScope && !paramScope->GetCanMergeWithBodyScope()) |
| { |
| // Emit bytecode to copy the initial values from param names to their corresponding body bindings. |
| // We have to do this after the rest param is marked as false for need declaration. |
| paramScope->ForEachSymbol([&](Symbol* param) { |
| Symbol* varSym = funcInfo->GetBodyScope()->FindLocalSymbol(param->GetName()); |
| Assert(varSym || pnode->sxFnc.pnodeName->sxVar.sym == param); |
| Assert(param->GetIsArguments() || param->IsInSlot(funcInfo)); |
| if (param->GetIsArguments() && !funcInfo->GetHasArguments()) |
| { |
| // Do not copy the arguments to the body if it is not used |
| } |
| else if (varSym && varSym->GetSymbolType() == STVariable && (varSym->IsInSlot(funcInfo) || varSym->GetLocation() != Js::Constants::NoRegister)) |
| { |
| // Simulating EmitPropLoad here. We can't directly call the method as we have to use the param scope specifically. |
| // Walking the scope chain is not possible at this time. |
| Js::RegSlot tempReg = funcInfo->AcquireTmpRegister(); |
| Js::PropertyId slot = param->EnsureScopeSlot(funcInfo); |
| Js::ProfileId profileId = funcInfo->FindOrAddSlotProfileId(paramScope, slot); |
| Js::OpCode op = paramScope->GetIsObject() ? Js::OpCode::LdParamObjSlot : Js::OpCode::LdParamSlot; |
| slot = slot + (paramScope->GetIsObject() ? 0 : Js::ScopeSlots::FirstSlotIndex); |
| |
| this->m_writer.SlotI1(op, tempReg, slot, profileId); |
| |
| if (ShouldTrackDebuggerMetadata() && !varSym->GetIsArguments() && !varSym->IsInSlot(funcInfo)) |
| { |
| byteCodeFunction->InsertSymbolToRegSlotList(varSym->GetName(), varSym->GetLocation(), funcInfo->varRegsCount); |
| } |
| |
| this->EmitPropStore(tempReg, varSym, varSym->GetPid(), funcInfo); |
| funcInfo->ReleaseTmpRegister(tempReg); |
| } |
| }); |
| |
| // In split scope as the body has a separate closure we have to copy the value of this and other special slots |
| // from param scope to the body scope |
| auto copySpecialSymbolsToBody = [this, funcInfo, paramScope] (Js::PropertyId src, Js::PropertyId dest) |
| { |
| if (dest != Js::Constants::NoProperty) |
| { |
| Js::RegSlot tempReg = funcInfo->AcquireTmpRegister(); |
| Js::PropertyId slot = src; |
| Js::ProfileId profileId = funcInfo->FindOrAddSlotProfileId(paramScope, slot); |
| Js::OpCode op = paramScope->GetIsObject() ? Js::OpCode::LdParamObjSlot : Js::OpCode::LdParamSlot; |
| slot = slot + (paramScope->GetIsObject() ? 0 : Js::ScopeSlots::FirstSlotIndex); |
| |
| this->m_writer.SlotI1(op, tempReg, slot, profileId); |
| |
| op = funcInfo->bodyScope->GetIsObject() ? Js::OpCode::StLocalObjSlot : Js::OpCode::StLocalSlot; |
| slot = dest + (funcInfo->bodyScope->GetIsObject() ? 0 : Js::ScopeSlots::FirstSlotIndex); |
| this->m_writer.SlotI1(op, tempReg, slot); |
| funcInfo->ReleaseTmpRegister(tempReg); |
| } |
| }; |
| copySpecialSymbolsToBody(funcInfo->innerThisScopeSlot, funcInfo->thisScopeSlot); |
| copySpecialSymbolsToBody(funcInfo->innerSuperScopeSlot, funcInfo->superScopeSlot); |
| copySpecialSymbolsToBody(funcInfo->innerSuperCtorScopeSlot, funcInfo->superCtorScopeSlot); |
| copySpecialSymbolsToBody(funcInfo->innerNewTargetScopeSlot, funcInfo->newTargetScopeSlot); |
| } |
| |
| if (pnode->sxFnc.pnodeBodyScope != nullptr) |
| { |
| ::BeginEmitBlock(pnode->sxFnc.pnodeBodyScope, this, funcInfo); |
| } |
| |
| this->inPrologue = false; |
| |
| if (funcInfo->IsGlobalFunction()) |
| { |
| EmitGlobalBody(funcInfo); |
| } |
| else |
| { |
| EmitFunctionBody(funcInfo); |
| } |
| |
| if (pnode->sxFnc.pnodeBodyScope != nullptr) |
| { |
| ::EndEmitBlock(pnode->sxFnc.pnodeBodyScope, this, funcInfo); |
| } |
| ::EndEmitBlock(pnode->sxFnc.pnodeScopes, this, funcInfo); |
| |
| if (!this->IsInDebugMode()) |
| { |
| // Release the temp registers that we reserved for inner scopes above. |
| if (innerScopeCount) |
| { |
| Js::RegSlot tmpReg = funcInfo->FirstInnerScopeReg() + innerScopeCount - 1; |
| for (uint i = 0; i < innerScopeCount; i++) |
| { |
| funcInfo->ReleaseTmpRegister(tmpReg); |
| tmpReg--; |
| } |
| } |
| } |
| |
| Assert(funcInfo->firstTmpReg == firstTmpReg); |
| Assert(funcInfo->curTmpReg == firstTmpReg); |
| Assert(byteCodeFunction->GetFirstTmpReg() == firstTmpReg + byteCodeFunction->GetConstantCount()); |
| |
| byteCodeFunction->CheckAndSetVarCount(funcInfo->varRegsCount); |
| byteCodeFunction->CheckAndSetOutParamMaxDepth(funcInfo->outArgsMaxDepth); |
| |
| // Do a uint32 add just to verify that we haven't overflowed the reg slot type. |
| UInt32Math::Add(funcInfo->varRegsCount, funcInfo->constRegsCount); |
| |
| #if DBG_DUMP |
| if (PHASE_STATS1(Js::ByteCodePhase)) |
| { |
| Output::Print(_u(" BCode: %-10d, Aux: %-10d, AuxC: %-10d Total: %-10d, %s\n"), |
| m_writer.ByteCodeDataSize(), |
| m_writer.AuxiliaryDataSize(), |
| m_writer.AuxiliaryContextDataSize(), |
| m_writer.ByteCodeDataSize() + m_writer.AuxiliaryDataSize() + m_writer.AuxiliaryContextDataSize(), |
| funcInfo->name); |
| |
| this->scriptContext->byteCodeDataSize += m_writer.ByteCodeDataSize(); |
| this->scriptContext->byteCodeAuxiliaryDataSize += m_writer.AuxiliaryDataSize(); |
| this->scriptContext->byteCodeAuxiliaryContextDataSize += m_writer.AuxiliaryContextDataSize(); |
| } |
| #endif |
| |
| this->MapCacheIdsToPropertyIds(funcInfo); |
| this->MapReferencedPropertyIds(funcInfo); |
| |
| Assert(this->TopFuncInfo() == funcInfo); |
| PopFuncInfo(_u("EmitOneFunction")); |
| m_writer.SetCallSiteCount(m_callSiteId); |
| #ifdef LOG_BYTECODE_AST_RATIO |
| m_writer.End(funcInfo->root->sxFnc.astSize, this->maxAstSize); |
| #else |
| m_writer.End(); |
| #endif |
| } |
| catch (...) |
| { |
| // Failed to generate byte-code for this function body (likely OOM or stack overflow). Notify the function body so that |
| // it can revert intermediate state changes that may have taken place during byte code generation before the failure. |
| byteCodeFunction->ResetByteCodeGenState(); |
| m_writer.Reset(); |
| throw; |
| } |
| |
| #ifdef PERF_HINT |
| if (PHASE_TRACE1(Js::PerfHintPhase) && !byteCodeFunction->GetIsGlobalFunc()) |
| { |
| if (byteCodeFunction->GetHasTry()) |
| { |
| WritePerfHint(PerfHints::HasTryBlock_Verbose, byteCodeFunction); |
| } |
| |
| if (funcInfo->GetCallsEval()) |
| { |
| WritePerfHint(PerfHints::CallsEval_Verbose, byteCodeFunction); |
| } |
| else if (funcInfo->GetChildCallsEval()) |
| { |
| WritePerfHint(PerfHints::ChildCallsEval, byteCodeFunction); |
| } |
| } |
| #endif |
| |
| |
| byteCodeFunction->SetInitialDefaultEntryPoint(); |
| |
| #ifdef ENABLE_DEBUG_CONFIG_OPTIONS |
| if (byteCodeFunction->IsInDebugMode() != scriptContext->IsScriptContextInDebugMode()) // debug mode mismatch |
| { |
| if (m_utf8SourceInfo->GetIsLibraryCode()) |
| { |
| Assert(!byteCodeFunction->IsInDebugMode()); // Library script byteCode is never in debug mode |
| } |
| else |
| { |
| Js::Throw::FatalInternalError(); |
| } |
| } |
| #endif |
| |
| #if DBG_DUMP |
| if (PHASE_DUMP(Js::ByteCodePhase, funcInfo->byteCodeFunction) && Js::Configuration::Global.flags.Verbose) |
| { |
| pnode->Dump(); |
| } |
| if (this->Trace() || PHASE_DUMP(Js::ByteCodePhase, funcInfo->byteCodeFunction)) |
| { |
| Js::ByteCodeDumper::Dump(byteCodeFunction); |
| } |
| if (PHASE_DUMP(Js::DebuggerScopePhase, funcInfo->byteCodeFunction)) |
| { |
| byteCodeFunction->DumpScopes(); |
| } |
| #endif |
| #if ENABLE_NATIVE_CODEGEN |
| if ((!PHASE_OFF(Js::BackEndPhase, funcInfo->byteCodeFunction)) |
| && !this->forceNoNative |
| && !this->scriptContext->GetConfig()->IsNoNative()) |
| { |
| GenerateFunction(this->scriptContext->GetNativeCodeGenerator(), byteCodeFunction); |
| } |
| #endif |
| } |
| |
| void ByteCodeGenerator::MapCacheIdsToPropertyIds(FuncInfo *funcInfo) |
| { |
| Js::FunctionBody *functionBody = funcInfo->GetParsedFunctionBody(); |
| uint rootObjectLoadInlineCacheStart = funcInfo->GetInlineCacheCount(); |
| uint rootObjectLoadMethodInlineCacheStart = rootObjectLoadInlineCacheStart + funcInfo->GetRootObjectLoadInlineCacheCount(); |
| uint rootObjectStoreInlineCacheStart = rootObjectLoadMethodInlineCacheStart + funcInfo->GetRootObjectLoadMethodInlineCacheCount(); |
| uint totalFieldAccessInlineCacheCount = rootObjectStoreInlineCacheStart + funcInfo->GetRootObjectStoreInlineCacheCount(); |
| |
| functionBody->CreateCacheIdToPropertyIdMap(rootObjectLoadInlineCacheStart, rootObjectLoadMethodInlineCacheStart, |
| rootObjectStoreInlineCacheStart, totalFieldAccessInlineCacheCount, funcInfo->GetIsInstInlineCacheCount()); |
| |
| if (totalFieldAccessInlineCacheCount == 0) |
| { |
| return; |
| } |
| |
| funcInfo->inlineCacheMap->Map([functionBody](Js::RegSlot regSlot, FuncInfo::InlineCacheIdMap *inlineCacheIdMap) |
| { |
| inlineCacheIdMap->Map([functionBody](Js::PropertyId propertyId, FuncInfo::InlineCacheList* inlineCacheList) |
| { |
| if (inlineCacheList) |
| { |
| inlineCacheList->Iterate([functionBody, propertyId](InlineCacheUnit cacheUnit) |
| { |
| CompileAssert(offsetof(InlineCacheUnit, cacheId) == offsetof(InlineCacheUnit, loadCacheId)); |
| if (cacheUnit.loadCacheId != -1) |
| { |
| functionBody->SetPropertyIdForCacheId(cacheUnit.loadCacheId, propertyId); |
| } |
| if (cacheUnit.loadMethodCacheId != -1) |
| { |
| functionBody->SetPropertyIdForCacheId(cacheUnit.loadMethodCacheId, propertyId); |
| } |
| if (cacheUnit.storeCacheId != -1) |
| { |
| functionBody->SetPropertyIdForCacheId(cacheUnit.storeCacheId, propertyId); |
| } |
| }); |
| } |
| }); |
| }); |
| |
| funcInfo->rootObjectLoadInlineCacheMap->Map([functionBody, rootObjectLoadInlineCacheStart](Js::PropertyId propertyId, uint cacheId) |
| { |
| functionBody->SetPropertyIdForCacheId(cacheId + rootObjectLoadInlineCacheStart, propertyId); |
| }); |
| funcInfo->rootObjectLoadMethodInlineCacheMap->Map([functionBody, rootObjectLoadMethodInlineCacheStart](Js::PropertyId propertyId, uint cacheId) |
| { |
| functionBody->SetPropertyIdForCacheId(cacheId + rootObjectLoadMethodInlineCacheStart, propertyId); |
| }); |
| funcInfo->rootObjectStoreInlineCacheMap->Map([functionBody, rootObjectStoreInlineCacheStart](Js::PropertyId propertyId, uint cacheId) |
| { |
| functionBody->SetPropertyIdForCacheId(cacheId + rootObjectStoreInlineCacheStart, propertyId); |
| }); |
| |
| SListBase<uint>::Iterator valueOfIter(&funcInfo->valueOfStoreCacheIds); |
| while (valueOfIter.Next()) |
| { |
| functionBody->SetPropertyIdForCacheId(valueOfIter.Data(), Js::PropertyIds::valueOf); |
| } |
| |
| SListBase<uint>::Iterator toStringIter(&funcInfo->toStringStoreCacheIds); |
| while (toStringIter.Next()) |
| { |
| functionBody->SetPropertyIdForCacheId(toStringIter.Data(), Js::PropertyIds::toString); |
| } |
| |
| #if DBG |
| functionBody->VerifyCacheIdToPropertyIdMap(); |
| #endif |
| } |
| |
| void ByteCodeGenerator::MapReferencedPropertyIds(FuncInfo * funcInfo) |
| { |
| Js::FunctionBody *functionBody = funcInfo->GetParsedFunctionBody(); |
| uint referencedPropertyIdCount = funcInfo->GetReferencedPropertyIdCount(); |
| functionBody->CreateReferencedPropertyIdMap(referencedPropertyIdCount); |
| |
| funcInfo->referencedPropertyIdToMapIndex->Map([functionBody](Js::PropertyId propertyId, uint mapIndex) |
| { |
| functionBody->SetReferencedPropertyIdWithMapIndex(mapIndex, propertyId); |
| }); |
| |
| #if DBG |
| functionBody->VerifyReferencedPropertyIdMap(); |
| #endif |
| } |
| |
| void ByteCodeGenerator::EmitScopeList(ParseNode *pnode, ParseNode *breakOnBodyScopeNode) |
| { |
| while (pnode) |
| { |
| switch (pnode->nop) |
| { |
| case knopFncDecl: |
| #ifndef TEMP_DISABLE_ASMJS |
| if (pnode->sxFnc.GetAsmjsMode()) |
| { |
| Js::ExclusiveContext context(this, GetScriptContext()); |
| if (Js::AsmJSCompiler::Compile(&context, pnode, pnode->sxFnc.pnodeParams)) |
| { |
| pnode = pnode->sxFnc.pnodeNext; |
| break; |
| } |
| else if (CONFIG_FLAG(AsmJsStopOnError)) |
| { |
| exit(JSERR_AsmJsCompileError); |
| } |
| else if (!(flags & fscrDeferFncParse)) |
| { |
| // If deferral is not allowed, throw and reparse everything with asm.js disabled. |
| throw Js::AsmJsParseException(); |
| } |
| } |
| #endif |
| // FALLTHROUGH |
| case knopProg: |
| if (pnode->sxFnc.funcInfo) |
| { |
| this->StartEmitFunction(pnode); |
| |
| Scope* paramScope = pnode->sxFnc.funcInfo->GetParamScope(); |
| |
| // Persist outer func scope info if nested func is deferred |
| if (CONFIG_FLAG(DeferNested)) |
| { |
| FuncInfo* parentFunc = TopFuncInfo(); |
| Js::ScopeInfo::SaveScopeInfoForDeferParse(this, parentFunc, pnode->sxFnc.funcInfo); |
| PushFuncInfo(_u("StartEmitFunction"), pnode->sxFnc.funcInfo); |
| } |
| |
| if (paramScope && !paramScope->GetCanMergeWithBodyScope()) |
| { |
| // Before emitting the body scoped functions let us switch the special scope slot to use the body ones |
| pnode->sxFnc.funcInfo->UseInnerSpecialScopeSlots(); |
| this->EmitScopeList(pnode->sxFnc.pnodeBodyScope->sxBlock.pnodeScopes); |
| } |
| else |
| { |
| this->EmitScopeList(pnode->sxFnc.pnodeScopes); |
| } |
| |
| this->EmitOneFunction(pnode); |
| this->EndEmitFunction(pnode); |
| } |
| pnode = pnode->sxFnc.pnodeNext; |
| break; |
| |
| case knopBlock: |
| this->StartEmitBlock(pnode); |
| this->EmitScopeList(pnode->sxBlock.pnodeScopes); |
| this->EndEmitBlock(pnode); |
| pnode = pnode->sxBlock.pnodeNext; |
| break; |
| |
| case knopCatch: |
| this->StartEmitCatch(pnode); |
| this->EmitScopeList(pnode->sxCatch.pnodeScopes); |
| this->EndEmitCatch(pnode); |
| pnode = pnode->sxCatch.pnodeNext; |
| break; |
| |
| case knopWith: |
| this->StartEmitWith(pnode); |
| this->EmitScopeList(pnode->sxWith.pnodeScopes); |
| this->EndEmitWith(pnode); |
| pnode = pnode->sxWith.pnodeNext; |
| break; |
| |
| default: |
| AssertMsg(false, "Unexpected opcode in tree of scopes"); |
| break; |
| } |
| |
| if (breakOnBodyScopeNode != nullptr && breakOnBodyScopeNode == pnode) |
| { |
| break; |
| } |
| } |
| } |
| |
| void EnsureFncDeclScopeSlot(ParseNode *pnodeFnc, FuncInfo *funcInfo) |
| { |
| if (pnodeFnc->sxFnc.pnodeName) |
| { |
| Assert(pnodeFnc->sxFnc.pnodeName->nop == knopVarDecl); |
| Symbol *sym = pnodeFnc->sxFnc.pnodeName->sxVar.sym; |
| // If this function is shadowing the arguments symbol in body then skip it. |
| // We will allocate scope slot for the arguments symbol during EmitLocalPropInit. |
| if (sym && !sym->GetIsArguments()) |
| { |
| sym->EnsureScopeSlot(funcInfo); |
| } |
| } |
| } |
| |
| // Similar to EnsureFncScopeSlot visitor function, but verifies that a slot is needed before assigning it. |
| void CheckFncDeclScopeSlot(ParseNode *pnodeFnc, FuncInfo *funcInfo) |
| { |
| if (pnodeFnc->sxFnc.pnodeName && pnodeFnc->sxFnc.pnodeName->nop == knopVarDecl) |
| { |
| Assert(pnodeFnc->sxFnc.pnodeName->nop == knopVarDecl); |
| Symbol *sym = pnodeFnc->sxFnc.pnodeName->sxVar.sym; |
| if (sym && sym->NeedsSlotAlloc(funcInfo)) |
| { |
| sym->EnsureScopeSlot(funcInfo); |
| } |
| } |
| } |
| |
| void ByteCodeGenerator::EnsureSpecialScopeSlots(FuncInfo* funcInfo, Scope* scope) |
| { |
| if (scope->GetIsObject()) |
| { |
| if (funcInfo->isThisLexicallyCaptured) |
| { |
| funcInfo->EnsureThisScopeSlot(); |
| } |
| |
| if (((!funcInfo->IsLambda() && funcInfo->GetCallsEval()) |
| || funcInfo->isSuperLexicallyCaptured)) |
| { |
| if (funcInfo->superRegister != Js::Constants::NoRegister) |
| { |
| funcInfo->EnsureSuperScopeSlot(); |
| } |
| |
| if (funcInfo->superCtorRegister != Js::Constants::NoRegister) |
| { |
| funcInfo->EnsureSuperCtorScopeSlot(); |
| } |
| } |
| |
| if (funcInfo->isNewTargetLexicallyCaptured) |
| { |
| funcInfo->EnsureNewTargetScopeSlot(); |
| } |
| } |
| else |
| { |
| // Don't rely on the Emit() pass to assign scope slots where needed, because peeps/shortcuts |
| // may cause some expressions not to be emitted. Assign the slots we need before we start |
| // emitting the prolog. |
| // TODO: Investigate moving detection of non-local references to Emit() so we don't assign |
| // slots to symbols that are never referenced in emitted code. |
| |
| if (funcInfo->isThisLexicallyCaptured) |
| { |
| funcInfo->EnsureThisScopeSlot(); |
| } |
| |
| if (funcInfo->isSuperLexicallyCaptured) |
| { |
| funcInfo->EnsureSuperScopeSlot(); |
| } |
| |
| if (funcInfo->isSuperCtorLexicallyCaptured) |
| { |
| funcInfo->EnsureSuperCtorScopeSlot(); |
| } |
| |
| if (funcInfo->isNewTargetLexicallyCaptured) |
| { |
| funcInfo->EnsureNewTargetScopeSlot(); |
| } |
| } |
| } |
| |
| void ByteCodeGenerator::InitSpecialScopeSlots(FuncInfo* funcInfo) |
| { |
| if (funcInfo->bodyScope->GetIsObject()) |
| { |
| // In split scope make sure to do init fld for the duplicate special scope slots |
| if (funcInfo->innerThisScopeSlot != Js::Constants::NoProperty) |
| { |
| uint cacheId = funcInfo->FindOrAddInlineCacheId(funcInfo->bodyScope->GetLocation(), Js::PropertyIds::_lexicalThisSlotSymbol, false, true); |
| m_writer.ElementP(Js::OpCode::InitLocalFld, funcInfo->thisPointerRegister, cacheId); |
| } |
| if (funcInfo->innerSuperScopeSlot != Js::Constants::NoProperty) |
| { |
| uint cacheId = funcInfo->FindOrAddInlineCacheId(funcInfo->bodyScope->GetLocation(), Js::PropertyIds::_superReferenceSymbol, false, true); |
| m_writer.ElementP(Js::OpCode::InitLocalFld, funcInfo->superRegister, cacheId); |
| } |
| if (funcInfo->innerSuperCtorScopeSlot != Js::Constants::NoProperty) |
| { |
| uint cacheId = funcInfo->FindOrAddInlineCacheId(funcInfo->bodyScope->GetLocation(), Js::PropertyIds::_superCtorReferenceSymbol, false, true); |
| m_writer.ElementP(Js::OpCode::InitLocalFld, funcInfo->superCtorRegister, cacheId); |
| } |
| if (funcInfo->innerNewTargetScopeSlot != Js::Constants::NoProperty) |
| { |
| uint cacheId = funcInfo->FindOrAddInlineCacheId(funcInfo->bodyScope->GetLocation(), Js::PropertyIds::_lexicalNewTargetSymbol, false, true); |
| m_writer.ElementP(Js::OpCode::InitLocalFld, funcInfo->newTargetRegister, cacheId); |
| } |
| } |
| } |
| |
| void ByteCodeGenerator::StartEmitFunction(ParseNode *pnodeFnc) |
| { |
| Assert(pnodeFnc->nop == knopFncDecl || pnodeFnc->nop == knopProg); |
| |
| FuncInfo *funcInfo = pnodeFnc->sxFnc.funcInfo; |
| |
| if (funcInfo->byteCodeFunction->IsFunctionParsed() && |
| !(flags & (fscrEval | fscrImplicitThis | fscrImplicitParents))) |
| { |
| // Only set the environment depth if it's truly known (i.e., not in eval or event handler). |
| funcInfo->GetParsedFunctionBody()->SetEnvDepth(this->envDepth); |
| } |
| |
| if (funcInfo->GetCallsEval()) |
| { |
| funcInfo->byteCodeFunction->SetDontInline(true); |
| } |
| |
| Scope * const funcExprScope = funcInfo->funcExprScope; |
| if (funcExprScope) |
| { |
| if (funcInfo->GetCallsEval()) |
| { |
| Assert(funcExprScope->GetIsObject()); |
| } |
| |
| if (funcExprScope->GetIsObject()) |
| { |
| funcExprScope->SetCapturesAll(true); |
| funcExprScope->SetMustInstantiate(true); |
| PushScope(funcExprScope); |
| } |
| else |
| { |
| Symbol *sym = funcInfo->root->sxFnc.GetFuncSymbol(); |
| if (funcInfo->paramScope->GetCanMergeWithBodyScope()) |
| { |
| funcInfo->bodyScope->AddSymbol(sym); |
| } |
| else |
| { |
| funcInfo->paramScope->AddSymbol(sym); |
| } |
| } |
| } |
| |
| Scope * const bodyScope = funcInfo->GetBodyScope(); |
| Scope * const paramScope = funcInfo->GetParamScope(); |
| |
| if (pnodeFnc->nop != knopProg) |
| { |
| if (!bodyScope->GetIsObject() && NeedObjectAsFunctionScope(funcInfo, pnodeFnc)) |
| { |
| Assert(bodyScope->GetIsObject()); |
| } |
| |
| if (bodyScope->GetIsObject()) |
| { |
| bodyScope->SetLocation(funcInfo->frameObjRegister); |
| } |
| else |
| { |
| bodyScope->SetLocation(funcInfo->frameSlotsRegister); |
| } |
| |
| if (!paramScope->GetCanMergeWithBodyScope()) |
| { |
| if (paramScope->GetIsObject()) |
| { |
| paramScope->SetLocation(funcInfo->frameObjRegister); |
| } |
| else |
| { |
| paramScope->SetLocation(funcInfo->frameSlotsRegister); |
| } |
| } |
| |
| if (bodyScope->GetIsObject()) |
| { |
| // Win8 908700: Disable under F12 debugger because there are too many cached scopes holding onto locals. |
| funcInfo->SetHasCachedScope( |
| !PHASE_OFF(Js::CachedScopePhase, funcInfo->byteCodeFunction) && |
| !funcInfo->Escapes() && |
| funcInfo->frameObjRegister != Js::Constants::NoRegister && |
| !ApplyEnclosesArgs(pnodeFnc, this) && |
| (PHASE_FORCE(Js::CachedScopePhase, funcInfo->byteCodeFunction) || !IsInDebugMode())); |
| |
| if (funcInfo->GetHasCachedScope()) |
| { |
| Assert(funcInfo->funcObjRegister == Js::Constants::NoRegister); |
| Symbol *funcSym = funcInfo->root->sxFnc.GetFuncSymbol(); |
| if (funcSym && funcSym->GetFuncExpr()) |
| { |
| if (funcSym->GetLocation() == Js::Constants::NoRegister) |
| { |
| funcInfo->funcObjRegister = funcInfo->NextVarRegister(); |
| } |
| else |
| { |
| funcInfo->funcObjRegister = funcSym->GetLocation(); |
| } |
| } |
| else |
| { |
| funcInfo->funcObjRegister = funcInfo->NextVarRegister(); |
| } |
| Assert(funcInfo->funcObjRegister != Js::Constants::NoRegister); |
| } |
| |
| ParseNode *pnode; |
| Symbol *sym; |
| |
| // Turns on capturesAll temporarily if func has deferred child, so that the following EnsureScopeSlot |
| // will allocate scope slots no matter if symbol hasNonLocalRefence or not. |
| Js::ScopeInfo::AutoCapturesAllScope autoCapturesAllScope(bodyScope, funcInfo->HasDeferredChild()); |
| |
| if (funcInfo->GetHasArguments()) |
| { |
| // Process function's formal parameters |
| MapFormals(pnodeFnc, [&](ParseNode *pnode) |
| { |
| if (pnode->IsVarLetOrConst()) |
| { |
| pnode->sxVar.sym->EnsureScopeSlot(funcInfo); |
| } |
| }); |
| |
| MapFormalsFromPattern(pnodeFnc, [&](ParseNode *pnode) { pnode->sxVar.sym->EnsureScopeSlot(funcInfo); }); |
| |
| // Only allocate scope slot for "arguments" when really necessary. "hasDeferredChild" |
| // doesn't require scope slot for "arguments" because inner functions can't access |
| // outer function's arguments directly. |
| sym = funcInfo->GetArgumentsSymbol(); |
| Assert(sym); |
| if (sym->GetHasNonLocalReference() || autoCapturesAllScope.OldCapturesAll()) |
| { |
| sym->EnsureScopeSlot(funcInfo); |
| } |
| } |
| |
| sym = funcInfo->root->sxFnc.GetFuncSymbol(); |
| |
| if (sym && sym->NeedsSlotAlloc(funcInfo)) |
| { |
| if (funcInfo->funcExprScope && funcInfo->funcExprScope->GetIsObject()) |
| { |
| sym->SetScopeSlot(0); |
| } |
| else if (funcInfo->GetFuncExprNameReference()) |
| { |
| sym->EnsureScopeSlot(funcInfo); |
| } |
| } |
| |
| if (!funcInfo->GetHasArguments()) |
| { |
| Symbol *formal; |
| Js::ArgSlot pos = 1; |
| auto moveArgToReg = [&](ParseNode *pnode) |
| { |
| if (pnode->IsVarLetOrConst()) |
| { |
| formal = pnode->sxVar.sym; |
| // Get the param from its argument position into its assigned register. |
| // The position should match the location; otherwise, it has been shadowed by parameter with the same name. |
| if (formal->GetLocation() + 1 == pos) |
| { |
| pnode->sxVar.sym->EnsureScopeSlot(funcInfo); |
| } |
| } |
| pos++; |
| }; |
| MapFormals(pnodeFnc, moveArgToReg); |
| MapFormalsFromPattern(pnodeFnc, [&](ParseNode *pnode) { pnode->sxVar.sym->EnsureScopeSlot(funcInfo); }); |
| } |
| |
| this->EnsureSpecialScopeSlots(funcInfo, bodyScope); |
| |
| auto ensureFncDeclScopeSlots = [&](ParseNode *pnodeScope) |
| { |
| for (pnode = pnodeScope; pnode;) |
| { |
| switch (pnode->nop) |
| { |
| case knopFncDecl: |
| if (pnode->sxFnc.IsDeclaration()) |
| { |
| EnsureFncDeclScopeSlot(pnode, funcInfo); |
| } |
| pnode = pnode->sxFnc.pnodeNext; |
| break; |
| case knopBlock: |
| pnode = pnode->sxBlock.pnodeNext; |
| break; |
| case knopCatch: |
| pnode = pnode->sxCatch.pnodeNext; |
| break; |
| case knopWith: |
| pnode = pnode->sxWith.pnodeNext; |
| break; |
| } |
| } |
| }; |
| pnodeFnc->sxFnc.MapContainerScopes(ensureFncDeclScopeSlots); |
| |
| for (pnode = pnodeFnc->sxFnc.pnodeVars; pnode; pnode = pnode->sxVar.pnodeNext) |
| { |
| sym = pnode->sxVar.sym; |
| if (!(pnode->sxVar.isBlockScopeFncDeclVar && sym->GetIsBlockVar())) |
| { |
| if (sym->GetIsCatch() || (pnode->nop == knopVarDecl && sym->GetIsBlockVar())) |
| { |
| sym = funcInfo->bodyScope->FindLocalSymbol(sym->GetName()); |
| } |
| if (sym->GetSymbolType() == STVariable && !sym->GetIsArguments() |
| && (!funcInfo->IsInnerArgumentsSymbol(sym) || funcInfo->GetHasArguments())) |
| { |
| sym->EnsureScopeSlot(funcInfo); |
| } |
| } |
| } |
| |
| if (pnodeFnc->sxFnc.pnodeBody) |
| { |
| Assert(pnodeFnc->sxFnc.pnodeScopes->nop == knopBlock); |
| this->EnsureLetConstScopeSlots(pnodeFnc->sxFnc.pnodeBodyScope, funcInfo); |
| } |
| } |
| else |
| { |
| ParseNode *pnode; |
| Symbol *sym; |
| |
| this->EnsureSpecialScopeSlots(funcInfo, bodyScope); |
| |
| pnodeFnc->sxFnc.MapContainerScopes([&](ParseNode *pnodeScope) { this->EnsureFncScopeSlots(pnodeScope, funcInfo); }); |
| |
| for (pnode = pnodeFnc->sxFnc.pnodeVars; pnode; pnode = pnode->sxVar.pnodeNext) |
| { |
| sym = pnode->sxVar.sym; |
| if (!(pnode->sxVar.isBlockScopeFncDeclVar && sym->GetIsBlockVar())) |
| { |
| if (sym->GetIsCatch() || (pnode->nop == knopVarDecl && sym->GetIsBlockVar())) |
| { |
| sym = funcInfo->bodyScope->FindLocalSymbol(sym->GetName()); |
| } |
| if (sym->GetSymbolType() == STVariable && sym->NeedsSlotAlloc(funcInfo) && !sym->GetIsArguments() |
| && (!funcInfo->IsInnerArgumentsSymbol(sym) || funcInfo->GetHasArguments())) |
| { |
| sym->EnsureScopeSlot(funcInfo); |
| } |
| } |
| } |
| |
| auto ensureScopeSlot = [&](ParseNode *pnode) |
| { |
| if (pnode->IsVarLetOrConst()) |
| { |
| sym = pnode->sxVar.sym; |
| if (sym->GetSymbolType() == STFormal && sym->NeedsSlotAlloc(funcInfo)) |
| { |
| sym->EnsureScopeSlot(funcInfo); |
| } |
| } |
| }; |
| // Process function's formal parameters |
| MapFormals(pnodeFnc, ensureScopeSlot); |
| MapFormalsFromPattern(pnodeFnc, ensureScopeSlot); |
| |
| if (!paramScope->GetCanMergeWithBodyScope()) |
| { |
| sym = funcInfo->GetArgumentsSymbol(); |
| if (sym && funcInfo->GetHasArguments()) |
| { |
| // There is no eval so the arguments may be captured in a lambda. In split scope case |
| // we have to make sure the param arguments is also put in a slot. |
| sym->EnsureScopeSlot(funcInfo); |
| } |
| } |
| |
| if (pnodeFnc->sxFnc.pnodeBody) |
| { |
| this->EnsureLetConstScopeSlots(pnodeFnc->sxFnc.pnodeScopes, funcInfo); |
| this->EnsureLetConstScopeSlots(pnodeFnc->sxFnc.pnodeBodyScope, funcInfo); |
| } |
| } |
| |
| if (!paramScope->GetCanMergeWithBodyScope() && bodyScope->GetScopeSlotCount() == 0 && !bodyScope->GetHasOwnLocalInClosure()) |
| { |
| // When we have split scope the body scope may be wrongly marked as must instantiate even though the capture occurred |
| // in param scope. This check is to make sure if no capture occurs in body scope make in not must instantiate. |
| bodyScope->SetMustInstantiate(false); |
| } |
| else |
| { |
| bodyScope->SetMustInstantiate(funcInfo->frameObjRegister != Js::Constants::NoRegister || funcInfo->frameSlotsRegister != Js::Constants::NoRegister); |
| } |
| paramScope->SetMustInstantiate(!paramScope->GetCanMergeWithBodyScope()); |
| } |
| else |
| { |
| bool newScopeForEval = (funcInfo->byteCodeFunction->GetIsStrictMode() && (this->GetFlags() & fscrEval)); |
| |
| if (newScopeForEval) |
| { |
| Assert(bodyScope->GetIsObject()); |
| } |
| } |
| |
| if (paramScope && !paramScope->GetCanMergeWithBodyScope()) |
| { |
| ParseNodePtr paramBlock = pnodeFnc->sxFnc.pnodeScopes; |
| Assert(paramBlock->nop == knopBlock && paramBlock->sxBlock.blockType == Parameter); |
| |
| PushScope(paramScope); |
| |
| // While emitting the functions we have to stop when we see the body scope block. |
| // Otherwise functions defined in the body scope will not be able to get the right references. |
| this->EmitScopeList(paramBlock->sxBlock.pnodeScopes, pnodeFnc->sxFnc.pnodeBodyScope); |
| Assert(this->GetCurrentScope() == paramScope); |
| } |
| |
| PushScope(bodyScope); |
| } |
| |
| void ByteCodeGenerator::EmitModuleExportAccess(Symbol* sym, Js::OpCode opcode, Js::RegSlot location, FuncInfo* funcInfo) |
| { |
| if (EnsureSymbolModuleSlots(sym, funcInfo)) |
| { |
| this->Writer()->SlotI2(opcode, location, sym->GetModuleIndex(), sym->GetScopeSlot()); |
| } |
| else |
| { |
| this->Writer()->W1(Js::OpCode::RuntimeReferenceError, SCODE_CODE(ERRInvalidExportName)); |
| |
| if (opcode == Js::OpCode::LdModuleSlot) |
| { |
| this->Writer()->Reg1(Js::OpCode::LdUndef, location); |
| } |
| } |
| } |
| |
| bool ByteCodeGenerator::EnsureSymbolModuleSlots(Symbol* sym, FuncInfo* funcInfo) |
| { |
| Assert(sym->GetIsModuleExportStorage()); |
| |
| if (sym->GetModuleIndex() != Js::Constants::NoProperty && sym->GetScopeSlot() != Js::Constants::NoProperty) |
| { |
| return true; |
| } |
| |
| Js::JavascriptLibrary* library = this->GetScriptContext()->GetLibrary(); |
| library->EnsureModuleRecordList(); |
| uint moduleIndex = this->GetModuleID(); |
| uint moduleSlotIndex; |
| Js::SourceTextModuleRecord* moduleRecord = library->GetModuleRecord(moduleIndex); |
| |
| if (sym->GetIsModuleImport()) |
| { |
| Js::PropertyId localImportNameId = sym->EnsurePosition(funcInfo); |
| Js::ModuleNameRecord* moduleNameRecord = nullptr; |
| if (!moduleRecord->ResolveImport(localImportNameId, &moduleNameRecord)) |
| { |
| return false; |
| } |
| |
| AnalysisAssert(moduleNameRecord != nullptr); |
| Assert(moduleNameRecord->module->IsSourceTextModuleRecord()); |
| Js::SourceTextModuleRecord* resolvedModuleRecord = (Js::SourceTextModuleRecord*)moduleNameRecord->module; |
| |
| moduleIndex = resolvedModuleRecord->GetModuleId(); |
| moduleSlotIndex = resolvedModuleRecord->GetLocalExportSlotIndexByLocalName(moduleNameRecord->bindingName); |
| } |
| else |
| { |
| Js::PropertyId exportNameId = sym->EnsurePosition(funcInfo); |
| moduleSlotIndex = moduleRecord->GetLocalExportSlotIndexByLocalName(exportNameId); |
| } |
| |
| sym->SetModuleIndex(moduleIndex); |
| sym->SetScopeSlot(moduleSlotIndex); |
| |
| return true; |
| } |
| |
| void ByteCodeGenerator::EmitAssignmentToDefaultModuleExport(ParseNode* pnode, FuncInfo* funcInfo) |
| { |
| // We are assigning pnode to the default export of the current module. |
| uint moduleIndex = this->GetModuleID(); |
| |
| Js::JavascriptLibrary* library = this->GetScriptContext()->GetLibrary(); |
| library->EnsureModuleRecordList(); |
| Js::SourceTextModuleRecord* moduleRecord = library->GetModuleRecord(moduleIndex); |
| uint moduleSlotIndex = moduleRecord->GetLocalExportSlotIndexByExportName(Js::PropertyIds::default_); |
| |
| this->Writer()->SlotI2(Js::OpCode::StModuleSlot, pnode->location, moduleIndex, moduleSlotIndex); |
| } |
| |
| void ByteCodeGenerator::EnsureLetConstScopeSlots(ParseNode *pnodeBlock, FuncInfo *funcInfo) |
| { |
| bool hasNonLocalReference = pnodeBlock->sxBlock.GetCallsEval() || pnodeBlock->sxBlock.GetChildCallsEval(); |
| auto ensureLetConstSlots = ([this, pnodeBlock, funcInfo, hasNonLocalReference](ParseNode *pnode) |
| { |
| Symbol *sym = pnode->sxVar.sym; |
| sym->EnsureScopeSlot(funcInfo); |
| if (hasNonLocalReference) |
| { |
| sym->SetHasNonLocalReference(true, this); |
| } |
| }); |
| IterateBlockScopedVariables(pnodeBlock, ensureLetConstSlots); |
| } |
| |
| void ByteCodeGenerator::EnsureFncScopeSlots(ParseNode *pnode, FuncInfo *funcInfo) |
| { |
| while (pnode) |
| { |
| switch (pnode->nop) |
| { |
| case knopFncDecl: |
| if (pnode->sxFnc.IsDeclaration()) |
| { |
| CheckFncDeclScopeSlot(pnode, funcInfo); |
| } |
| pnode = pnode->sxFnc.pnodeNext; |
| break; |
| case knopBlock: |
| pnode = pnode->sxBlock.pnodeNext; |
| break; |
| case knopCatch: |
| pnode = pnode->sxCatch.pnodeNext; |
| break; |
| case knopWith: |
| pnode = pnode->sxWith.pnodeNext; |
| break; |
| } |
| } |
| } |
| |
| void ByteCodeGenerator::EndEmitFunction(ParseNode *pnodeFnc) |
| { |
| Assert(pnodeFnc->nop == knopFncDecl || pnodeFnc->nop == knopProg); |
| Assert(pnodeFnc->nop == knopFncDecl && currentScope->GetEnclosingScope() != nullptr || pnodeFnc->nop == knopProg); |
| |
| PopScope(); // function body |
| |
| FuncInfo *funcInfo = pnodeFnc->sxFnc.funcInfo; |
| |
| Scope* paramScope = funcInfo->paramScope; |
| if (paramScope && !paramScope->GetCanMergeWithBodyScope()) |
| { |
| Assert(this->GetCurrentScope() == paramScope); |
| PopScope(); // Pop the param scope |
| } |
| |
| Scope *scope = funcInfo->funcExprScope; |
| if (scope && scope->GetMustInstantiate()) |
| { |
| Assert(currentScope == scope); |
| PopScope(); |
| } |
| |
| if (CONFIG_FLAG(DeferNested)) |
| { |
| Assert(funcInfo == this->TopFuncInfo()); |
| PopFuncInfo(_u("EndEmitFunction")); |
| } |
| } |
| |
| void ByteCodeGenerator::StartEmitCatch(ParseNode *pnodeCatch) |
| { |
| Assert(pnodeCatch->nop == knopCatch); |
| |
| Scope *scope = pnodeCatch->sxCatch.scope; |
| FuncInfo *funcInfo = scope->GetFunc(); |
| |
| // Catch scope is a dynamic object if it can be passed to a scoped lookup helper (i.e., eval is present or we're in an event handler). |
| if (funcInfo->GetCallsEval() || funcInfo->GetChildCallsEval() || (this->flags & (fscrEval | fscrImplicitThis | fscrImplicitParents))) |
| { |
| scope->SetIsObject(); |
| } |
| |
| if (pnodeCatch->sxCatch.pnodeParam->nop == knopParamPattern) |
| { |
| scope->SetCapturesAll(funcInfo->GetCallsEval() || funcInfo->GetChildCallsEval()); |
| scope->SetMustInstantiate(scope->Count() > 0 && (scope->GetMustInstantiate() || scope->GetCapturesAll() || funcInfo->IsGlobalFunction())); |
| |
| Parser::MapBindIdentifier(pnodeCatch->sxCatch.pnodeParam->sxParamPattern.pnode1, [&](ParseNodePtr item) |
| { |
| Symbol *sym = item->sxVar.sym; |
| if (funcInfo->IsGlobalFunction()) |
| { |
| sym->SetIsGlobalCatch(true); |
| } |
| |
| Assert(sym->GetScopeSlot() == Js::Constants::NoProperty); |
| if (sym->NeedsSlotAlloc(funcInfo)) |
| { |
| sym->EnsureScopeSlot(funcInfo); |
| } |
| }); |
| |
| // In the case of pattern we will always going to push the scope. |
| PushScope(scope); |
| } |
| else |
| { |
| Symbol *sym = pnodeCatch->sxCatch.pnodeParam->sxPid.sym; |
| |
| // Catch object is stored in the catch scope if there may be an ambiguous lookup or a var declaration that hides it. |
| scope->SetCapturesAll(funcInfo->GetCallsEval() || funcInfo->GetChildCallsEval() || sym->GetHasNonLocalReference()); |
| scope->SetMustInstantiate(scope->GetCapturesAll() || funcInfo->IsGlobalFunction() || currentScope != funcInfo->GetBodyScope()); |
| |
| if (funcInfo->IsGlobalFunction()) |
| { |
| sym->SetIsGlobalCatch(true); |
| } |
| |
| if (scope->GetMustInstantiate()) |
| { |
| // Since there is only one symbol we are pushing to slot. |
| // Also in order to make IsInSlot to return true - forcing the sym-has-non-local-reference. |
| sym->SetHasNonLocalReference(true, this); |
| sym->EnsureScopeSlot(funcInfo); |
| |
| PushScope(scope); |
| } |
| else |
| { |
| // Add it to the parent function's scope and treat it like any other local. |
| // We can only do this if we don't need to get the symbol from a slot, though, because adding it to the |
| // parent's scope object on entry to the catch could re-size the slot array. |
| funcInfo->bodyScope->AddSymbol(sym); |
| } |
| } |
| } |
| |
| void ByteCodeGenerator::EndEmitCatch(ParseNode *pnodeCatch) |
| { |
| Assert(pnodeCatch->nop == knopCatch); |
| if (pnodeCatch->sxCatch.scope->GetMustInstantiate() || pnodeCatch->sxCatch.pnodeParam->nop == knopParamPattern) |
| { |
| Assert(currentScope == pnodeCatch->sxCatch.scope); |
| PopScope(); |
| } |
| } |
| |
| void ByteCodeGenerator::StartEmitBlock(ParseNode *pnodeBlock) |
| { |
| if (!BlockHasOwnScope(pnodeBlock, this)) |
| { |
| return; |
| } |
| |
| Assert(pnodeBlock->nop == knopBlock); |
| |
| PushBlock(pnodeBlock); |
| |
| Scope *scope = pnodeBlock->sxBlock.scope; |
| if (pnodeBlock->sxBlock.GetCallsEval() || pnodeBlock->sxBlock.GetChildCallsEval() || (this->flags & (fscrEval | fscrImplicitThis | fscrImplicitParents))) |
| { |
| Assert(scope->GetIsObject()); |
| } |
| |
| // TODO: Consider nested deferred parsing. |
| if (scope->GetMustInstantiate()) |
| { |
| FuncInfo *funcInfo = scope->GetFunc(); |
| if (scope->IsGlobalEvalBlockScope() && funcInfo->isThisLexicallyCaptured) |
| { |
| funcInfo->EnsureThisScopeSlot(); |
| } |
| this->EnsureFncScopeSlots(pnodeBlock->sxBlock.pnodeScopes, funcInfo); |
| this->EnsureLetConstScopeSlots(pnodeBlock, funcInfo); |
| PushScope(scope); |
| } |
| } |
| |
| void ByteCodeGenerator::EndEmitBlock(ParseNode *pnodeBlock) |
| { |
| if (!BlockHasOwnScope(pnodeBlock, this)) |
| { |
| return; |
| } |
| |
| Assert(pnodeBlock->nop == knopBlock); |
| |
| Scope *scope = pnodeBlock->sxBlock.scope; |
| if (scope && scope->GetMustInstantiate()) |
| { |
| Assert(currentScope == pnodeBlock->sxBlock.scope); |
| PopScope(); |
| } |
| |
| PopBlock(); |
| } |
| |
| void ByteCodeGenerator::StartEmitWith(ParseNode *pnodeWith) |
| { |
| Assert(pnodeWith->nop == knopWith); |
| |
| Scope *scope = pnodeWith->sxWith.scope; |
| |
| Assert(scope->GetIsObject()); |
| |
| PushScope(scope); |
| } |
| |
| void ByteCodeGenerator::EndEmitWith(ParseNode *pnodeWith) |
| { |
| Assert(pnodeWith->nop == knopWith); |
| Assert(currentScope == pnodeWith->sxWith.scope); |
| |
| PopScope(); |
| } |
| |
| Js::RegSlot ByteCodeGenerator::PrependLocalScopes(Js::RegSlot evalEnv, Js::RegSlot tempLoc, FuncInfo *funcInfo) |
| { |
| Scope *currScope = this->currentScope; |
| Scope *funcScope = funcInfo->GetCurrentChildScope() ? funcInfo->GetCurrentChildScope() : funcInfo->GetBodyScope(); |
| |
| if (currScope == funcScope) |
| { |
| return evalEnv; |
| } |
| |
| bool acquireTempLoc = tempLoc == Js::Constants::NoRegister; |
| if (acquireTempLoc) |
| { |
| tempLoc = funcInfo->AcquireTmpRegister(); |
| } |
| |
| // The with/catch objects must be prepended to the environment we pass to eval() or to a func declared inside with, |
| // but the list must first be reversed so that innermost scopes appear first in the list. |
| while (currScope != funcScope) |
| { |
| Scope *innerScope; |
| for (innerScope = currScope; innerScope->GetEnclosingScope() != funcScope; innerScope = innerScope->GetEnclosingScope()) |
| ; |
| if (innerScope->GetMustInstantiate()) |
| { |
| if (!innerScope->HasInnerScopeIndex()) |
| { |
| if (evalEnv == funcInfo->GetEnvRegister() || evalEnv == funcInfo->frameDisplayRegister) |
| { |
| this->m_writer.Reg2(Js::OpCode::LdInnerFrameDisplayNoParent, tempLoc, innerScope->GetLocation()); |
| } |
| else |
| { |
| this->m_writer.Reg3(Js::OpCode::LdInnerFrameDisplay, tempLoc, innerScope->GetLocation(), evalEnv); |
| } |
| } |
| else |
| { |
| if (evalEnv == funcInfo->GetEnvRegister() || evalEnv == funcInfo->frameDisplayRegister) |
| { |
| this->m_writer.Reg1Unsigned1(Js::OpCode::LdIndexedFrameDisplayNoParent, tempLoc, innerScope->GetInnerScopeIndex()); |
| } |
| else |
| { |
| this->m_writer.Reg2Int1(Js::OpCode::LdIndexedFrameDisplay, tempLoc, evalEnv, innerScope->GetInnerScopeIndex()); |
| } |
| } |
| evalEnv = tempLoc; |
| } |
| funcScope = innerScope; |
| } |
| |
| if (acquireTempLoc) |
| { |
| funcInfo->ReleaseTmpRegister(tempLoc); |
| } |
| return evalEnv; |
| } |
| |
| void ByteCodeGenerator::EmitLoadInstance(Symbol *sym, IdentPtr pid, Js::RegSlot *pThisLocation, Js::RegSlot *pInstLocation, FuncInfo *funcInfo) |
| { |
| Js::ByteCodeLabel doneLabel = 0; |
| bool fLabelDefined = false; |
| Js::RegSlot scopeLocation = Js::Constants::NoRegister; |
| Js::RegSlot thisLocation = *pThisLocation; |
| Js::RegSlot instLocation = *pInstLocation; |
| Js::PropertyId envIndex = -1; |
| Scope *scope = nullptr; |
| Scope *symScope = sym ? sym->GetScope() : this->globalScope; |
| Assert(symScope); |
| |
| for (;;) |
| { |
| scope = this->FindScopeForSym(symScope, scope, &envIndex, funcInfo); |
| if (scope == this->globalScope) |
| { |
| break; |
| } |
| |
| if (scope != symScope) |
| { |
| // We're not sure where the function is (eval/with/etc). |
| // So we're going to need registers to hold the instance where we (dynamically) find |
| // the function, and possibly to hold the "this" pointer we will pass to it. |
| // Assign them here so that they can't overlap with the scopeLocation assigned below. |
| // Otherwise we wind up with temp lifetime confusion in the IRBuilder. (Win8 281689) |
| if (instLocation == Js::Constants::NoRegister) |
| { |
| instLocation = funcInfo->AcquireTmpRegister(); |
| // The "this" pointer will not be the same as the instance, so give it its own register. |
| thisLocation = funcInfo->AcquireTmpRegister(); |
| } |
| } |
| |
| if (envIndex == -1) |
| { |
| Assert(funcInfo == scope->GetFunc()); |
| scopeLocation = scope->GetLocation(); |
| } |
| |
| if (scope == symScope) |
| { |
| break; |
| } |
| |
| // Found a scope to which the property may have been added. |
| Assert(scope && scope->GetIsDynamic()); |
| |
| if (!fLabelDefined) |
| { |
| fLabelDefined = true; |
| doneLabel = this->m_writer.DefineLabel(); |
| } |
| |
| Js::ByteCodeLabel nextLabel = this->m_writer.DefineLabel(); |
| Js::PropertyId propertyId = sym ? sym->EnsurePosition(this) : pid->GetPropertyId(); |
| |
| bool unwrapWithObj = scope->GetScopeType() == ScopeType_With && scriptContext->GetConfig()->IsES6UnscopablesEnabled(); |
| if (envIndex != -1) |
| { |
| this->m_writer.BrEnvProperty( |
| Js::OpCode::BrOnNoEnvProperty, nextLabel, |
| funcInfo->FindOrAddReferencedPropertyId(propertyId), |
| envIndex + Js::FrameDisplay::GetOffsetOfScopes()/sizeof(Js::Var)); |
| |
| Js::RegSlot tmpReg = funcInfo->AcquireTmpRegister(); |
| |
| this->m_writer.SlotI1(Js::OpCode::LdEnvObj, tmpReg, |
| envIndex + Js::FrameDisplay::GetOffsetOfScopes()/sizeof(Js::Var)); |
| |
| Js::OpCode op = unwrapWithObj ? Js::OpCode::UnwrapWithObj : Js::OpCode::Ld_A; |
| |
| this->m_writer.Reg2(op, instLocation, tmpReg); |
| if (thisLocation != Js::Constants::NoRegister) |
| { |
| this->m_writer.Reg2(op, thisLocation, tmpReg); |
| } |
| |
| funcInfo->ReleaseTmpRegister(tmpReg); |
| } |
| else if (scopeLocation != Js::Constants::NoRegister && scopeLocation == funcInfo->frameObjRegister) |
| { |
| this->m_writer.BrLocalProperty(Js::OpCode::BrOnNoLocalProperty, nextLabel, |
| funcInfo->FindOrAddReferencedPropertyId(propertyId)); |
| |
| Assert(!unwrapWithObj); |
| this->m_writer.Reg1(Js::OpCode::LdLocalObj, instLocation); |
| if (thisLocation != Js::Constants::NoRegister) |
| { |
| this->m_writer.Reg1(Js::OpCode::LdLocalObj, thisLocation); |
| } |
| } |
| else |
| { |
| this->m_writer.BrProperty(Js::OpCode::BrOnNoProperty, nextLabel, scopeLocation, |
| funcInfo->FindOrAddReferencedPropertyId(propertyId)); |
| |
| Js::OpCode op = unwrapWithObj ? Js::OpCode::UnwrapWithObj : Js::OpCode::Ld_A; |
| this->m_writer.Reg2(op, instLocation, scopeLocation); |
| if (thisLocation != Js::Constants::NoRegister) |
| { |
| this->m_writer.Reg2(op, thisLocation, scopeLocation); |
| } |
| } |
| |
| this->m_writer.Br(doneLabel); |
| this->m_writer.MarkLabel(nextLabel); |
| } |
| |
| if (sym != nullptr && sym->GetIsModuleExportStorage()) |
| { |
| instLocation = Js::Constants::NoRegister; |
| } |
| else if (sym == nullptr || sym->GetIsGlobal()) |
| { |
| if (this->flags & (fscrEval | fscrImplicitThis | fscrImplicitParents)) |
| { |
| // Load of a symbol with unknown scope from within eval. |
| // Get it from the closure environment. |
| if (instLocation == Js::Constants::NoRegister) |
| { |
| instLocation = funcInfo->AcquireTmpRegister(); |
| } |
| |
| // TODO: It should be possible to avoid this double call to ScopedLdInst by having it return both |
| // results at once. The reason for the uncertainty here is that we don't know whether the callee |
| // belongs to a "with" object. If it does, we have to pass the "with" object as "this"; in all other |
| // cases, we pass "undefined". For now, there are apparently no significant performance issues. |
| Js::PropertyId propertyId = sym ? sym->EnsurePosition(this) : pid->GetPropertyId(); |
| |
| if (thisLocation == Js::Constants::NoRegister) |
| { |
| thisLocation = funcInfo->AcquireTmpRegister(); |
| } |
| this->m_writer.ScopedProperty2(Js::OpCode::ScopedLdInst, instLocation, |
| funcInfo->FindOrAddReferencedPropertyId(propertyId), thisLocation); |
| } |
| else |
| { |
| if (instLocation == Js::Constants::NoRegister) |
| { |
| instLocation = ByteCodeGenerator::RootObjectRegister; |
| } |
| else |
| { |
| this->m_writer.Reg2(Js::OpCode::Ld_A, instLocation, ByteCodeGenerator::RootObjectRegister); |
| } |
| |
| if (thisLocation == Js::Constants::NoRegister) |
| { |
| thisLocation = funcInfo->undefinedConstantRegister; |
| } |
| else |
| { |
| this->m_writer.Reg2(Js::OpCode::Ld_A, thisLocation, funcInfo->undefinedConstantRegister); |
| } |
| } |
| } |
| else if (instLocation != Js::Constants::NoRegister) |
| { |
| if (envIndex != -1) |
| { |
| this->m_writer.SlotI1(Js::OpCode::LdEnvObj, instLocation, |
| envIndex + Js::FrameDisplay::GetOffsetOfScopes()/sizeof(Js::Var)); |
| } |
| else if (scope->HasInnerScopeIndex()) |
| { |
| this->m_writer.Reg1Unsigned1(Js::OpCode::LdInnerScope, instLocation, scope->GetInnerScopeIndex()); |
| } |
| else if (symScope != funcInfo->GetBodyScope()) |
| { |
| this->m_writer.Reg2(Js::OpCode::Ld_A, instLocation, scopeLocation); |
| } |
| else |
| { |
| Assert(funcInfo->frameObjRegister != Js::Constants::NoRegister); |
| this->m_writer.Reg1(Js::OpCode::LdLocalObj, instLocation); |
| } |
| |
| if (thisLocation != Js::Constants::NoRegister) |
| { |
| this->m_writer.Reg2(Js::OpCode::Ld_A, thisLocation, funcInfo->undefinedConstantRegister); |
| } |
| else |
| { |
| thisLocation = funcInfo->undefinedConstantRegister; |
| } |
| } |
| |
| *pThisLocation = thisLocation; |
| *pInstLocation = instLocation; |
| |
| if (fLabelDefined) |
| { |
| this->m_writer.MarkLabel(doneLabel); |
| } |
| } |
| |
| void ByteCodeGenerator::EmitGlobalFncDeclInit(Js::RegSlot rhsLocation, Js::PropertyId propertyId, FuncInfo * funcInfo) |
| { |
| // Note: declared variables and assignments in the global function go to the root object directly. |
| if (this->flags & fscrEval) |
| { |
| // Func decl's always get their init values before any use, so we don't pre-initialize the property to undef. |
| // That means that we have to use ScopedInitFld so that we initialize the property on the right instance |
| // even if the instance doesn't have the property yet (i.e., collapse the init-to-undef and the store |
| // into one operation). See WOOB 1121763 and 1120973. |
| this->m_writer.ScopedProperty(Js::OpCode::ScopedInitFunc, rhsLocation, |
| funcInfo->FindOrAddReferencedPropertyId(propertyId)); |
| } |
| else |
| { |
| this->EmitPatchableRootProperty(Js::OpCode::InitRootFld, rhsLocation, propertyId, false, true, funcInfo); |
| } |
| } |
| |
| void |
| ByteCodeGenerator::EmitPatchableRootProperty(Js::OpCode opcode, |
| Js::RegSlot regSlot, Js::PropertyId propertyId, bool isLoadMethod, bool isStore, FuncInfo * funcInfo) |
| { |
| uint cacheId = funcInfo->FindOrAddRootObjectInlineCacheId(propertyId, isLoadMethod, isStore); |
| this->m_writer.PatchableRootProperty(opcode, regSlot, cacheId, isLoadMethod, isStore); |
| } |
| |
| void ByteCodeGenerator::EmitLocalPropInit(Js::RegSlot rhsLocation, Symbol *sym, FuncInfo *funcInfo) |
| { |
| Scope *scope = sym->GetScope(); |
| |
| // Check consistency of sym->IsInSlot. |
| Assert(sym->NeedsSlotAlloc(funcInfo) || sym->GetScopeSlot() == Js::Constants::NoProperty); |
| |
| // Arrived at the scope in which the property was defined. |
| if (sym->NeedsSlotAlloc(funcInfo)) |
| { |
| // The property is in memory rather than register. We'll have to load it from the slots. |
| if (scope->GetIsObject()) |
| { |
| Assert(!this->TopFuncInfo()->GetParsedFunctionBody()->DoStackNestedFunc()); |
| Js::PropertyId propertyId = sym->EnsurePosition(this); |
| Js::RegSlot objReg; |
| if (scope->HasInnerScopeIndex()) |
| { |
| objReg = funcInfo->InnerScopeToRegSlot(scope); |
| } |
| else |
| { |
| objReg = scope->GetLocation(); |
| } |
| uint cacheId = funcInfo->FindOrAddInlineCacheId(objReg, propertyId, false, true); |
| Js::OpCode op = this->GetInitFldOp(scope, objReg, funcInfo, sym->GetIsNonSimpleParameter()); |
| if (objReg != Js::Constants::NoRegister && objReg == funcInfo->frameObjRegister) |
| { |
| this->m_writer.ElementP(op, rhsLocation, cacheId); |
| } |
| else if (scope->HasInnerScopeIndex()) |
| { |
| this->m_writer.ElementPIndexed(op, rhsLocation, scope->GetInnerScopeIndex(), cacheId); |
| } |
| else |
| { |
| this->m_writer.PatchableProperty(op, rhsLocation, scope->GetLocation(), cacheId); |
| } |
| } |
| else |
| { |
| // Make sure the property has a slot. This will bump up the size of the slot array if necessary. |
| Js::PropertyId slot = sym->EnsureScopeSlot(funcInfo); |
| Js::RegSlot slotReg = scope->GetCanMerge() ? funcInfo->frameSlotsRegister : scope->GetLocation(); |
| // Now store the property to its slot. |
| Js::OpCode op = this->GetStSlotOp(scope, -1, slotReg, false, funcInfo); |
| |
| if (slotReg != Js::Constants::NoRegister && slotReg == funcInfo->frameSlotsRegister) |
| { |
| this->m_writer.SlotI1(op, rhsLocation, slot + Js::ScopeSlots::FirstSlotIndex); |
| } |
| else |
| { |
| this->m_writer.SlotI2(op, rhsLocation, scope->GetInnerScopeIndex(), slot + Js::ScopeSlots::FirstSlotIndex); |
| } |
| } |
| } |
| if (sym->GetLocation() != Js::Constants::NoRegister && rhsLocation != sym->GetLocation()) |
| { |
| this->m_writer.Reg2(Js::OpCode::Ld_A, sym->GetLocation(), rhsLocation); |
| } |
| } |
| |
| Js::OpCode |
| ByteCodeGenerator::GetStSlotOp(Scope *scope, int envIndex, Js::RegSlot scopeLocation, bool chkBlockVar, FuncInfo *funcInfo) |
| { |
| Js::OpCode op; |
| |
| if (envIndex != -1) |
| { |
| if (scope->GetIsObject()) |
| { |
| op = Js::OpCode::StEnvObjSlot; |
| } |
| else |
| { |
| op = Js::OpCode::StEnvSlot; |
| } |
| } |
| else if (scopeLocation != Js::Constants::NoRegister && |
| scopeLocation == funcInfo->frameSlotsRegister) |
| { |
| op = Js::OpCode::StLocalSlot; |
| } |
| else if (scopeLocation != Js::Constants::NoRegister && |
| scopeLocation == funcInfo->frameObjRegister) |
| { |
| op = Js::OpCode::StLocalObjSlot; |
| } |
| else |
| { |
| Assert(scope->HasInnerScopeIndex()); |
| if (scope->GetIsObject()) |
| { |
| op = Js::OpCode::StInnerObjSlot; |
| } |
| else |
| { |
| op = Js::OpCode::StInnerSlot; |
| } |
| } |
| |
| if (chkBlockVar) |
| { |
| op = this->ToChkUndeclOp(op); |
| } |
| |
| return op; |
| } |
| |
| Js::OpCode |
| ByteCodeGenerator::GetInitFldOp(Scope *scope, Js::RegSlot scopeLocation, FuncInfo *funcInfo, bool letDecl) |
| { |
| Js::OpCode op; |
| |
| if (scopeLocation != Js::Constants::NoRegister && |
| scopeLocation == funcInfo->frameObjRegister) |
| { |
| op = letDecl ? Js::OpCode::InitLocalLetFld : Js::OpCode::InitLocalFld; |
| } |
| else if (scope->HasInnerScopeIndex()) |
| { |
| op = letDecl ? Js::OpCode::InitInnerLetFld : Js::OpCode::InitInnerFld; |
| } |
| else |
| { |
| op = letDecl ? Js::OpCode::InitLetFld : Js::OpCode::InitFld; |
| } |
| |
| return op; |
| } |
| |
| void ByteCodeGenerator::EmitPropStore(Js::RegSlot rhsLocation, Symbol *sym, IdentPtr pid, FuncInfo *funcInfo, bool isLetDecl, bool isConstDecl, bool isFncDeclVar) |
| { |
| Js::ByteCodeLabel doneLabel = 0; |
| bool fLabelDefined = false; |
| Js::PropertyId envIndex = -1; |
| Scope *symScope = sym == nullptr || sym->GetIsGlobal() ? this->globalScope : sym->GetScope(); |
| Assert(symScope); |
| // isFncDeclVar denotes that the symbol being stored to here is the var |
| // binding of a function declaration and we know we want to store directly |
| // to it, skipping over any dynamic scopes that may lie in between. |
| Scope *scope = nullptr; |
| Js::RegSlot scopeLocation = Js::Constants::NoRegister; |
| bool scopeAcquired = false; |
| Js::OpCode op; |
| |
| if (sym && sym->GetIsModuleExportStorage()) |
| { |
| if (!isConstDecl && sym->GetDecl() && sym->GetDecl()->nop == knopConstDecl) |
| { |
| this->m_writer.W1(Js::OpCode::RuntimeTypeError, SCODE_CODE(ERRAssignmentToConst)); |
| } |
| |
| EmitModuleExportAccess(sym, Js::OpCode::StModuleSlot, rhsLocation, funcInfo); |
| return; |
| } |
| |
| if (isFncDeclVar) |
| { |
| // async functions allow for the fncDeclVar to be in the body or parameter scope |
| // of the parent function, so we need to calculate envIndex in lieu of the while |
| // loop below. |
| do |
| { |
| scope = this->FindScopeForSym(symScope, scope, &envIndex, funcInfo); |
| } while (scope != symScope); |
| Assert(scope == symScope); |
| scopeLocation = scope->GetLocation(); |
| } |
| |
| while (!isFncDeclVar) |
| { |
| scope = this->FindScopeForSym(symScope, scope, &envIndex, funcInfo); |
| if (scope == this->globalScope) |
| { |
| break; |
| } |
| if (envIndex == -1) |
| { |
| Assert(funcInfo == scope->GetFunc()); |
| scopeLocation = scope->GetLocation(); |
| } |
| |
| if (scope == symScope) |
| { |
| break; |
| } |
| |
| // Found a scope to which the property may have been added. |
| Assert(scope && scope->GetIsDynamic()); |
| |
| if (!fLabelDefined) |
| { |
| fLabelDefined = true; |
| doneLabel = this->m_writer.DefineLabel(); |
| } |
| Js::ByteCodeLabel nextLabel = this->m_writer.DefineLabel(); |
| Js::PropertyId propertyId = sym ? sym->EnsurePosition(this) : pid->GetPropertyId(); |
| |
| Js::RegSlot unwrappedScopeLocation = scopeLocation; |
| bool unwrapWithObj = scope->GetScopeType() == ScopeType_With && scriptContext->GetConfig()->IsES6UnscopablesEnabled(); |
| if (envIndex != -1) |
| { |
| this->m_writer.BrEnvProperty( |
| Js::OpCode::BrOnNoEnvProperty, |
| nextLabel, |
| funcInfo->FindOrAddReferencedPropertyId(propertyId), |
| envIndex + Js::FrameDisplay::GetOffsetOfScopes()/sizeof(Js::Var)); |
| |
| Js::RegSlot instLocation = funcInfo->AcquireTmpRegister(); |
| |
| this->m_writer.SlotI1( |
| Js::OpCode::LdEnvObj, |
| instLocation, |
| envIndex + Js::FrameDisplay::GetOffsetOfScopes()/sizeof(Js::Var)); |
| |
| if (unwrapWithObj) |
| { |
| this->m_writer.Reg2(Js::OpCode::UnwrapWithObj, instLocation, instLocation); |
| } |
| |
| this->m_writer.PatchableProperty( |
| Js::OpCode::StFld, |
| rhsLocation, |
| instLocation, |
| funcInfo->FindOrAddInlineCacheId(instLocation, propertyId, false, true)); |
| |
| funcInfo->ReleaseTmpRegister(instLocation); |
| } |
| else if (scopeLocation != Js::Constants::NoRegister && scopeLocation == funcInfo->frameObjRegister) |
| { |
| this->m_writer.BrLocalProperty(Js::OpCode::BrOnNoLocalProperty, nextLabel, |
| funcInfo->FindOrAddReferencedPropertyId(propertyId)); |
| |
| Assert(!unwrapWithObj); |
| this->m_writer.ElementP(Js::OpCode::StLocalFld, rhsLocation, |
| funcInfo->FindOrAddInlineCacheId(scopeLocation, propertyId, false, true)); |
| } |
| else |
| { |
| this->m_writer.BrProperty(Js::OpCode::BrOnNoProperty, nextLabel, scopeLocation, |
| funcInfo->FindOrAddReferencedPropertyId(propertyId)); |
| |
| if (unwrapWithObj) |
| { |
| unwrappedScopeLocation = funcInfo->AcquireTmpRegister(); |
| this->m_writer.Reg2(Js::OpCode::UnwrapWithObj, unwrappedScopeLocation, scopeLocation); |
| scopeLocation = unwrappedScopeLocation; |
| } |
| |
| uint cacheId = funcInfo->FindOrAddInlineCacheId(scopeLocation, propertyId, false, true); |
| this->m_writer.PatchableProperty(Js::OpCode::StFld, rhsLocation, scopeLocation, cacheId); |
| |
| if (unwrapWithObj) |
| { |
| funcInfo->ReleaseTmpRegister(unwrappedScopeLocation); |
| } |
| } |
| |
| this->m_writer.Br(doneLabel); |
| this->m_writer.MarkLabel(nextLabel); |
| } |
| |
| // Arrived at the scope in which the property was defined. |
| if (sym && sym->GetNeedDeclaration() && scope->GetFunc() == funcInfo) |
| { |
| EmitUseBeforeDeclarationRuntimeError(this, Js::Constants::NoRegister); |
| // Intentionally continue on to do normal EmitPropStore behavior so |
| // that the bytecode ends up well-formed for the backend. This is |
| // in contrast to EmitPropLoad and EmitPropTypeof where they both |
| // tell EmitUseBeforeDeclarationRuntimeError to emit a LdUndef in place |
| // of their load and then they skip emitting their own bytecode. |
| // Potayto potahto. |
| } |
| |
| if (sym == nullptr || sym->GetIsGlobal()) |
| { |
| Js::PropertyId propertyId = sym ? sym->EnsurePosition(this) : pid->GetPropertyId(); |
| if (this->flags & fscrEval) |
| { |
| if (funcInfo->byteCodeFunction->GetIsStrictMode() && funcInfo->IsGlobalFunction()) |
| { |
| uint cacheId = funcInfo->FindOrAddInlineCacheId(funcInfo->frameDisplayRegister, propertyId, false, true); |
| this->m_writer.ElementP(GetScopedStFldOpCode(funcInfo), rhsLocation, cacheId); |
| } |
| else |
| { |
| uint cacheId = funcInfo->FindOrAddInlineCacheId(funcInfo->GetEnvRegister(), propertyId, false, true); |
| bool isConsoleScopeLetConst = this->IsConsoleScopeEval() && (isLetDecl || isConstDecl); |
| // In "eval", store to a symbol with unknown scope goes through the closure environment. |
| this->m_writer.ElementP(GetScopedStFldOpCode(funcInfo, isConsoleScopeLetConst), rhsLocation, cacheId); |
| } |
| } |
| else if (this->flags & (fscrImplicitThis | fscrImplicitParents)) |
| { |
| uint cacheId = funcInfo->FindOrAddInlineCacheId(funcInfo->GetEnvRegister(), propertyId, false, true); |
| |
| // In "eval", store to a symbol with unknown scope goes through the closure environment. |
| this->m_writer.ElementP(GetScopedStFldOpCode(funcInfo), rhsLocation, cacheId); |
| } |
| else |
| { |
| this->EmitPatchableRootProperty(GetStFldOpCode(funcInfo, true, isLetDecl, isConstDecl, false), rhsLocation, propertyId, false, true, funcInfo); |
| } |
| } |
| else if (sym->GetFuncExpr()) |
| { |
| // Store to function expr variable. |
| |
| // strict mode: we need to throw type error |
| if (funcInfo->byteCodeFunction->GetIsStrictMode()) |
| { |
| // Note that in this case the sym's location belongs to the parent function, so we can't use it. |
| // It doesn't matter which register we use, as long as it's valid for this function. |
| this->m_writer.W1(Js::OpCode::RuntimeTypeError, SCODE_CODE(JSERR_CantAssignToReadOnly)); |
| } |
| } |
| else if (sym->IsInSlot(funcInfo) || envIndex != -1) |
| { |
| if (!isConstDecl && sym->GetDecl() && sym->GetDecl()->nop == knopConstDecl) |
| { |
| // This is a case where const reassignment can't be proven statically (e.g., eval, with) so |
| // we have to catch it at runtime. |
| this->m_writer.W1( |
| Js::OpCode::RuntimeTypeError, SCODE_CODE(ERRAssignmentToConst)); |
| } |
| // Make sure the property has a slot. This will bump up the size of the slot array if necessary. |
| Js::PropertyId slot = sym->EnsureScopeSlot(funcInfo); |
| bool chkBlockVar = !isLetDecl && !isConstDecl && NeedCheckBlockVar(sym, scope, funcInfo); |
| |
| // The property is in memory rather than register. We'll have to load it from the slots. |
| op = this->GetStSlotOp(scope, envIndex, scopeLocation, chkBlockVar, funcInfo); |
| |
| if (envIndex != -1) |
| { |
| this->m_writer.SlotI2(op, rhsLocation, |
| envIndex + Js::FrameDisplay::GetOffsetOfScopes()/sizeof(Js::Var), |
| slot + (sym->GetScope()->GetIsObject()? 0 : Js::ScopeSlots::FirstSlotIndex)); |
| } |
| else if (scopeLocation != Js::Constants::NoRegister && |
| (scopeLocation == funcInfo->frameSlotsRegister || scopeLocation == funcInfo->frameObjRegister)) |
| { |
| this->m_writer.SlotI1(op, rhsLocation, |
| slot + (sym->GetScope()->GetIsObject()? 0 : Js::ScopeSlots::FirstSlotIndex)); |
| } |
| else |
| { |
| Assert(scope->HasInnerScopeIndex()); |
| this->m_writer.SlotI2(op, rhsLocation, scope->GetInnerScopeIndex(), |
| slot + (sym->GetScope()->GetIsObject()? 0 : Js::ScopeSlots::FirstSlotIndex)); |
| } |
| |
| if (this->ShouldTrackDebuggerMetadata() && (isLetDecl || isConstDecl)) |
| { |
| Js::PropertyId location = scope->GetIsObject() ? sym->GetLocation() : slot; |
| this->UpdateDebuggerPropertyInitializationOffset(location, sym->GetPosition(), false); |
| } |
| } |
| else if (isConstDecl) |
| { |
| this->m_writer.Reg2(Js::OpCode::InitConst, sym->GetLocation(), rhsLocation); |
| |
| if (this->ShouldTrackDebuggerMetadata()) |
| { |
| this->UpdateDebuggerPropertyInitializationOffset(sym->GetLocation(), sym->GetPosition()); |
| } |
| } |
| else |
| { |
| if (!isConstDecl && sym->GetDecl() && sym->GetDecl()->nop == knopConstDecl) |
| { |
| // This is a case where const reassignment can't be proven statically (e.g., eval, with) so |
| // we have to catch it at runtime. |
| this->m_writer.W1(Js::OpCode::RuntimeTypeError, SCODE_CODE(ERRAssignmentToConst)); |
| } |
| if (rhsLocation != sym->GetLocation()) |
| { |
| this->m_writer.Reg2(Js::OpCode::Ld_A, sym->GetLocation(), rhsLocation); |
| |
| if (this->ShouldTrackDebuggerMetadata() && isLetDecl) |
| { |
| this->UpdateDebuggerPropertyInitializationOffset(sym->GetLocation(), sym->GetPosition()); |
| } |
| } |
| } |
| if (fLabelDefined) |
| { |
| this->m_writer.MarkLabel(doneLabel); |
| } |
| |
| if (scopeAcquired) |
| { |
| funcInfo->ReleaseTmpRegister(scopeLocation); |
| } |
| } |
| |
| Js::OpCode |
| ByteCodeGenerator::GetLdSlotOp(Scope *scope, int envIndex, Js::RegSlot scopeLocation, FuncInfo *funcInfo) |
| { |
| Js::OpCode op; |
| |
| if (envIndex != -1) |
| { |
| if (scope->GetIsObject()) |
| { |
| op = Js::OpCode::LdEnvObjSlot; |
| } |
| else |
| { |
| op = Js::OpCode::LdEnvSlot; |
| } |
| } |
| else if (scopeLocation != Js::Constants::NoRegister && |
| scopeLocation == funcInfo->frameSlotsRegister) |
| { |
| op = Js::OpCode::LdLocalSlot; |
| } |
| else if (scopeLocation != Js::Constants::NoRegister && |
| scopeLocation == funcInfo->frameObjRegister) |
| { |
| op = Js::OpCode::LdLocalObjSlot; |
| } |
| else if (scope->HasInnerScopeIndex()) |
| { |
| if (scope->GetIsObject()) |
| { |
| op = Js::OpCode::LdInnerObjSlot; |
| } |
| else |
| { |
| op = Js::OpCode::LdInnerSlot; |
| } |
| } |
| else |
| { |
| Assert(scope->GetIsObject()); |
| op = Js::OpCode::LdObjSlot; |
| } |
| |
| return op; |
| } |
| |
| void ByteCodeGenerator::EmitPropLoad(Js::RegSlot lhsLocation, Symbol *sym, IdentPtr pid, FuncInfo *funcInfo) |
| { |
| // If sym belongs to a parent frame, get it from the closure environment. |
| // If it belongs to this func, but there's a non-local reference, get it from the heap-allocated frame. |
| // (TODO: optimize this by getting the sym from its normal location if there are no non-local defs.) |
| // Otherwise, just copy the value to the lhsLocation. |
| |
| Js::ByteCodeLabel doneLabel = 0; |
| bool fLabelDefined = false; |
| Js::RegSlot scopeLocation = Js::Constants::NoRegister; |
| Js::PropertyId envIndex = -1; |
| Scope *scope = nullptr; |
| Scope *symScope = sym ? sym->GetScope() : this->globalScope; |
| Assert(symScope); |
| |
| if (sym && sym->GetIsModuleExportStorage()) |
| { |
| EmitModuleExportAccess(sym, Js::OpCode::LdModuleSlot, lhsLocation, funcInfo); |
| return; |
| } |
| |
| for (;;) |
| { |
| scope = this->FindScopeForSym(symScope, scope, &envIndex, funcInfo); |
| if (scope == this->globalScope) |
| { |
| break; |
| } |
| |
| scopeLocation = scope->GetLocation(); |
| |
| if (scope == symScope) |
| { |
| break; |
| } |
| |
| // Found a scope to which the property may have been added. |
| Assert(scope && scope->GetIsDynamic()); |
| |
| if (!fLabelDefined) |
| { |
| fLabelDefined = true; |
| doneLabel = this->m_writer.DefineLabel(); |
| } |
| |
| Js::ByteCodeLabel nextLabel = this->m_writer.DefineLabel(); |
| Js::PropertyId propertyId = sym ? sym->EnsurePosition(this) : pid->GetPropertyId(); |
| |
| Js::RegSlot unwrappedScopeLocation = Js::Constants::NoRegister; |
| bool unwrapWithObj = scope->GetScopeType() == ScopeType_With && scriptContext->GetConfig()->IsES6UnscopablesEnabled(); |
| if (envIndex != -1) |
| { |
| this->m_writer.BrEnvProperty( |
| Js::OpCode::BrOnNoEnvProperty, |
| nextLabel, |
| funcInfo->FindOrAddReferencedPropertyId(propertyId), |
| envIndex + Js::FrameDisplay::GetOffsetOfScopes()/sizeof(Js::Var)); |
| |
| Js::RegSlot instLocation = funcInfo->AcquireTmpRegister(); |
| |
| this->m_writer.SlotI1( |
| Js::OpCode::LdEnvObj, |
| instLocation, |
| envIndex + Js::FrameDisplay::GetOffsetOfScopes()/sizeof(Js::Var)); |
| |
| if (unwrapWithObj) |
| { |
| this->m_writer.Reg2(Js::OpCode::UnwrapWithObj, instLocation, instLocation); |
| } |
| |
| this->m_writer.PatchableProperty( |
| Js::OpCode::LdFld, |
| lhsLocation, |
| instLocation, |
| funcInfo->FindOrAddInlineCacheId(instLocation, propertyId, false, false)); |
| |
| funcInfo->ReleaseTmpRegister(instLocation); |
| } |
| else if (scopeLocation != Js::Constants::NoRegister && scopeLocation == funcInfo->frameObjRegister) |
| { |
| this->m_writer.BrLocalProperty(Js::OpCode::BrOnNoLocalProperty, nextLabel, |
| funcInfo->FindOrAddReferencedPropertyId(propertyId)); |
| |
| Assert(!unwrapWithObj); |
| this->m_writer.ElementP(Js::OpCode::LdLocalFld, lhsLocation, |
| funcInfo->FindOrAddInlineCacheId(scopeLocation, propertyId, false, false)); |
| } |
| else |
| { |
| this->m_writer.BrProperty(Js::OpCode::BrOnNoProperty, nextLabel, scopeLocation, |
| funcInfo->FindOrAddReferencedPropertyId(propertyId)); |
| |
| if (unwrapWithObj) |
| { |
| unwrappedScopeLocation = funcInfo->AcquireTmpRegister(); |
| this->m_writer.Reg2(Js::OpCode::UnwrapWithObj, unwrappedScopeLocation, scopeLocation); |
| scopeLocation = unwrappedScopeLocation; |
| } |
| |
| uint cacheId = funcInfo->FindOrAddInlineCacheId(scopeLocation, propertyId, false, false); |
| this->m_writer.PatchableProperty(Js::OpCode::LdFld, lhsLocation, scopeLocation, cacheId); |
| |
| if (unwrapWithObj) |
| { |
| funcInfo->ReleaseTmpRegister(unwrappedScopeLocation); |
| } |
| } |
| |
| this->m_writer.Br(doneLabel); |
| this->m_writer.MarkLabel(nextLabel); |
| } |
| |
| // Arrived at the scope in which the property was defined. |
| if (sym && sym->GetNeedDeclaration() && scope->GetFunc() == funcInfo) |
| { |
| // Ensure this symbol has a slot if it needs one. |
| if (sym->IsInSlot(funcInfo)) |
| { |
| Js::PropertyId slot = sym->EnsureScopeSlot(funcInfo); |
| funcInfo->FindOrAddSlotProfileId(scope, slot); |
| } |
| |
| EmitUseBeforeDeclarationRuntimeError(this, lhsLocation); |
| } |
| else if (sym == nullptr || sym->GetIsGlobal()) |
| { |
| Js::PropertyId propertyId = sym ? sym->EnsurePosition(this) : pid->GetPropertyId(); |
| if (this->flags & fscrEval) |
| { |
| if (funcInfo->byteCodeFunction->GetIsStrictMode() && funcInfo->IsGlobalFunction()) |
| { |
| uint cacheId = funcInfo->FindOrAddInlineCacheId(funcInfo->frameDisplayRegister, propertyId, false, false); |
| this->m_writer.ElementP(Js::OpCode::ScopedLdFld, lhsLocation, cacheId); |
| } |
| else |
| { |
| uint cacheId = funcInfo->FindOrAddInlineCacheId(funcInfo->GetEnvRegister(), propertyId, false, false); |
| |
| // Load of a symbol with unknown scope from within eval |
| // Get it from the closure environment. |
| this->m_writer.ElementP(Js::OpCode::ScopedLdFld, lhsLocation, cacheId); |
| } |
| } |
| else if (this->flags & (fscrImplicitThis | fscrImplicitParents)) |
| { |
| uint cacheId = funcInfo->FindOrAddInlineCacheId(funcInfo->GetEnvRegister(), propertyId, false, false); |
| |
| // Load of a symbol with unknown scope from within eval or event handler. |
| // Get it from the closure environment. |
| this->m_writer.ElementP(Js::OpCode::ScopedLdFld, lhsLocation, cacheId); |
| } |
| else |
| { |
| // Special case non-writable built-ins |
| // TODO: support non-writable global property in general by detecting what attribute the property have current? |
| // But can't be done if we are byte code serialized, because the attribute might be different for use fields |
| // next time we run. May want to catch that in the JIT. |
| Js::OpCode opcode = Js::OpCode::LdRootFld; |
| |
| // These properties are non-writable |
| switch (propertyId) |
| { |
| case Js::PropertyIds::NaN: |
| opcode = Js::OpCode::LdNaN; |
| break; |
| case Js::PropertyIds::Infinity: |
| opcode = Js::OpCode::LdInfinity; |
| break; |
| case Js::PropertyIds::undefined: |
| opcode = Js::OpCode::LdUndef; |
| break; |
| } |
| |
| if (opcode == Js::OpCode::LdRootFld) |
| { |
| this->EmitPatchableRootProperty(Js::OpCode::LdRootFld, lhsLocation, propertyId, false, false, funcInfo); |
| } |
| else |
| { |
| this->Writer()->Reg1(opcode, lhsLocation); |
| } |
| } |
| } |
| else if (sym->IsInSlot(funcInfo) || envIndex != -1) |
| { |
| // Make sure the property has a slot. This will bump up the size of the slot array if necessary. |
| Js::PropertyId slot = sym->EnsureScopeSlot(funcInfo); |
| Js::ProfileId profileId = funcInfo->FindOrAddSlotProfileId(scope, slot); |
| bool chkBlockVar = NeedCheckBlockVar(sym, scope, funcInfo); |
| Js::OpCode op; |
| |
| // Now get the property from its slot. |
| op = this->GetLdSlotOp(scope, envIndex, scopeLocation, funcInfo); |
| slot = slot + (sym->GetScope()->GetIsObject() ? 0 : Js::ScopeSlots::FirstSlotIndex); |
| |
| if (envIndex != -1) |
| { |
| this->m_writer.SlotI2(op, lhsLocation, envIndex + Js::FrameDisplay::GetOffsetOfScopes()/sizeof(Js::Var), slot, profileId); |
| } |
| else if (scopeLocation != Js::Constants::NoRegister && |
| (scopeLocation == funcInfo->frameSlotsRegister || scopeLocation == funcInfo->frameObjRegister)) |
| { |
| this->m_writer.SlotI1(op, lhsLocation, slot, profileId); |
| } |
| else if (scope->HasInnerScopeIndex()) |
| { |
| this->m_writer.SlotI2(op, lhsLocation, scope->GetInnerScopeIndex(), slot, profileId); |
| } |
| else |
| { |
| Assert(scope->GetIsObject()); |
| this->m_writer.Slot(op, lhsLocation, scopeLocation, slot, profileId); |
| } |
| |
| if (chkBlockVar) |
| { |
| this->m_writer.Reg1(Js::OpCode::ChkUndecl, lhsLocation); |
| } |
| } |
| else |
| { |
| if (lhsLocation != sym->GetLocation()) |
| { |
| this->m_writer.Reg2(Js::OpCode::Ld_A, lhsLocation, sym->GetLocation()); |
| } |
| if (sym->GetIsBlockVar() && ((sym->GetDecl()->nop == knopLetDecl || sym->GetDecl()->nop == knopConstDecl) && sym->GetDecl()->sxVar.isSwitchStmtDecl)) |
| { |
| this->m_writer.Reg1(Js::OpCode::ChkUndecl, lhsLocation); |
| } |
| } |
| |
| if (fLabelDefined) |
| { |
| this->m_writer.MarkLabel(doneLabel); |
| } |
| } |
| |
| bool ByteCodeGenerator::NeedCheckBlockVar(Symbol* sym, Scope* scope, FuncInfo* funcInfo) const |
| { |
| bool tdz = sym->GetIsBlockVar() |
| && (scope->GetFunc() != funcInfo || ((sym->GetDecl()->nop == knopLetDecl || sym->GetDecl()->nop == knopConstDecl) && sym->GetDecl()->sxVar.isSwitchStmtDecl)); |
| |
| return tdz || sym->GetIsNonSimpleParameter(); |
| } |
| |
| void ByteCodeGenerator::EmitPropDelete(Js::RegSlot lhsLocation, Symbol *sym, IdentPtr pid, FuncInfo *funcInfo) |
| { |
| // If sym belongs to a parent frame, delete it from the closure environment. |
| // If it belongs to this func, but there's a non-local reference, get it from the heap-allocated frame. |
| // (TODO: optimize this by getting the sym from its normal location if there are no non-local defs.) |
| // Otherwise, just return false. |
| |
| Js::ByteCodeLabel doneLabel = 0; |
| bool fLabelDefined = false; |
| Js::RegSlot scopeLocation = Js::Constants::NoRegister; |
| Js::PropertyId envIndex = -1; |
| Scope *scope = nullptr; |
| Scope *symScope = sym ? sym->GetScope() : this->globalScope; |
| Assert(symScope); |
| |
| for (;;) |
| { |
| scope = this->FindScopeForSym(symScope, scope, &envIndex, funcInfo); |
| if (scope == this->globalScope) |
| { |
| scopeLocation = ByteCodeGenerator::RootObjectRegister; |
| } |
| else if (envIndex == -1) |
| { |
| Assert(funcInfo == scope->GetFunc()); |
| scopeLocation = scope->GetLocation(); |
| } |
| |
| if (scope == symScope) |
| { |
| break; |
| } |
| |
| // Found a scope to which the property may have been added. |
| Assert(scope && scope->GetIsDynamic()); |
| |
| if (!fLabelDefined) |
| { |
| fLabelDefined = true; |
| doneLabel = this->m_writer.DefineLabel(); |
| } |
| |
| Js::ByteCodeLabel nextLabel = this->m_writer.DefineLabel(); |
| Js::PropertyId propertyId = sym ? sym->EnsurePosition(this) : pid->GetPropertyId(); |
| bool unwrapWithObj = scope->GetScopeType() == ScopeType_With && scriptContext->GetConfig()->IsES6UnscopablesEnabled(); |
| if (envIndex != -1) |
| { |
| this->m_writer.BrEnvProperty( |
| Js::OpCode::BrOnNoEnvProperty, |
| nextLabel, |
| funcInfo->FindOrAddReferencedPropertyId(propertyId), |
| envIndex + Js::FrameDisplay::GetOffsetOfScopes()/sizeof(Js::Var)); |
| |
| Js::RegSlot instLocation = funcInfo->AcquireTmpRegister(); |
| |
| this->m_writer.SlotI1( |
| Js::OpCode::LdEnvObj, |
| instLocation, |
| envIndex + Js::FrameDisplay::GetOffsetOfScopes()/sizeof(Js::Var)); |
| |
| if (unwrapWithObj) |
| { |
| this->m_writer.Reg2(Js::OpCode::UnwrapWithObj, instLocation, instLocation); |
| } |
| |
| this->m_writer.Property(Js::OpCode::DeleteFld, lhsLocation, instLocation, |
| funcInfo->FindOrAddReferencedPropertyId(propertyId)); |
| |
| funcInfo->ReleaseTmpRegister(instLocation); |
| } |
| else if (scopeLocation != Js::Constants::NoRegister && scopeLocation == funcInfo->frameObjRegister) |
| { |
| this->m_writer.BrLocalProperty(Js::OpCode::BrOnNoLocalProperty, nextLabel, |
| funcInfo->FindOrAddReferencedPropertyId(propertyId)); |
| |
| Assert(!unwrapWithObj); |
| this->m_writer.ElementU(Js::OpCode::DeleteLocalFld, lhsLocation, |
| funcInfo->FindOrAddReferencedPropertyId(propertyId)); |
| } |
| else |
| { |
| this->m_writer.BrProperty(Js::OpCode::BrOnNoProperty, nextLabel, scopeLocation, |
| funcInfo->FindOrAddReferencedPropertyId(propertyId)); |
| |
| Js::RegSlot unwrappedScopeLocation = Js::Constants::NoRegister; |
| if (unwrapWithObj) |
| { |
| unwrappedScopeLocation = funcInfo->AcquireTmpRegister(); |
| this->m_writer.Reg2(Js::OpCode::UnwrapWithObj, unwrappedScopeLocation, scopeLocation); |
| scopeLocation = unwrappedScopeLocation; |
| } |
| |
| this->m_writer.Property(Js::OpCode::DeleteFld, lhsLocation, scopeLocation, |
| funcInfo->FindOrAddReferencedPropertyId(propertyId)); |
| |
| if (unwrapWithObj) |
| { |
| funcInfo->ReleaseTmpRegister(unwrappedScopeLocation); |
| } |
| } |
| |
| this->m_writer.Br(doneLabel); |
| this->m_writer.MarkLabel(nextLabel); |
| } |
| |
| // Arrived at the scope in which the property was defined. |
| if (sym == nullptr || sym->GetIsGlobal()) |
| { |
| Js::PropertyId propertyId = sym ? sym->EnsurePosition(this) : pid->GetPropertyId(); |
| if (this->flags & (fscrEval | fscrImplicitThis | fscrImplicitParents)) |
| { |
| this->m_writer.ScopedProperty(Js::OpCode::ScopedDeleteFld, lhsLocation, |
| funcInfo->FindOrAddReferencedPropertyId(propertyId)); |
| } |
| else |
| { |
| this->m_writer.Property(Js::OpCode::DeleteRootFld, lhsLocation, ByteCodeGenerator::RootObjectRegister, |
| funcInfo->FindOrAddReferencedPropertyId(propertyId)); |
| } |
| } |
| else |
| { |
| // The delete will look like a non-local reference, so make sure a slot is reserved. |
| sym->EnsureScopeSlot(funcInfo); |
| this->m_writer.Reg1(Js::OpCode::LdFalse, lhsLocation); |
| } |
| |
| if (fLabelDefined) |
| { |
| this->m_writer.MarkLabel(doneLabel); |
| } |
| } |
| |
| void ByteCodeGenerator::EmitTypeOfFld(FuncInfo * funcInfo, Js::PropertyId propertyId, Js::RegSlot value, Js::RegSlot instance, Js::OpCode ldFldOp) |
| { |
| |
| uint cacheId; |
| Js::RegSlot tmpReg = funcInfo->AcquireTmpRegister(); |
| switch (ldFldOp) |
| { |
| case Js::OpCode::LdRootFldForTypeOf: |
| cacheId = funcInfo->FindOrAddRootObjectInlineCacheId(propertyId, false, false); |
| this->Writer()->PatchableRootProperty(ldFldOp, tmpReg, cacheId, false, false); |
| break; |
| |
| case Js::OpCode::LdLocalFld: |
| case Js::OpCode::ScopedLdFldForTypeOf: |
| cacheId = funcInfo->FindOrAddInlineCacheId(instance, propertyId, false, false); |
| this->Writer()->ElementP(ldFldOp, tmpReg, cacheId); |
| break; |
| |
| default: |
| cacheId = funcInfo->FindOrAddInlineCacheId(instance, propertyId, false, false); |
| this->Writer()->PatchableProperty(ldFldOp, tmpReg, instance, cacheId); |
| break; |
| } |
| |
| this->Writer()->Reg2(Js::OpCode::Typeof, value, tmpReg); |
| funcInfo->ReleaseTmpRegister(tmpReg); |
| } |
| |
| void ByteCodeGenerator::EmitPropTypeof(Js::RegSlot lhsLocation, Symbol *sym, IdentPtr pid, FuncInfo *funcInfo) |
| { |
| // If sym belongs to a parent frame, delete it from the closure environment. |
| // If it belongs to this func, but there's a non-local reference, get it from the heap-allocated frame. |
| // (TODO: optimize this by getting the sym from its normal location if there are no non-local defs.) |
| // Otherwise, just return false |
| |
| Js::ByteCodeLabel doneLabel = 0; |
| bool fLabelDefined = false; |
| Js::RegSlot scopeLocation = Js::Constants::NoRegister; |
| Js::PropertyId envIndex = -1; |
| Scope *scope = nullptr; |
| Scope *symScope = sym ? sym->GetScope() : this->globalScope; |
| Assert(symScope); |
| |
| if (sym && sym->GetIsModuleExportStorage()) |
| { |
| Js::RegSlot tmpLocation = funcInfo->AcquireTmpRegister(); |
| EmitModuleExportAccess(sym, Js::OpCode::LdModuleSlot, tmpLocation, funcInfo); |
| this->m_writer.Reg2(Js::OpCode::Typeof, lhsLocation, tmpLocation); |
| funcInfo->ReleaseTmpRegister(tmpLocation); |
| return; |
| } |
| |
| for (;;) |
| { |
| scope = this->FindScopeForSym(symScope, scope, &envIndex, funcInfo); |
| if (scope == this->globalScope) |
| { |
| scopeLocation = ByteCodeGenerator::RootObjectRegister; |
| } |
| else if (envIndex == -1) |
| { |
| Assert(funcInfo == scope->GetFunc()); |
| scopeLocation = scope->GetLocation(); |
| } |
| |
| if (scope == symScope) |
| { |
| break; |
| } |
| |
| // Found a scope to which the property may have been added. |
| Assert(scope && scope->GetIsDynamic()); |
| |
| if (!fLabelDefined) |
| { |
| fLabelDefined = true; |
| doneLabel = this->m_writer.DefineLabel(); |
| } |
| |
| Js::ByteCodeLabel nextLabel = this->m_writer.DefineLabel(); |
| Js::PropertyId propertyId = sym ? sym->EnsurePosition(this) : pid->GetPropertyId(); |
| |
| bool unwrapWithObj = scope->GetScopeType() == ScopeType_With && scriptContext->GetConfig()->IsES6UnscopablesEnabled(); |
| if (envIndex != -1) |
| { |
| this->m_writer.BrEnvProperty(Js::OpCode::BrOnNoEnvProperty, nextLabel, |
| funcInfo->FindOrAddReferencedPropertyId(propertyId), |
| envIndex + Js::FrameDisplay::GetOffsetOfScopes()/sizeof(Js::Var)); |
| |
| Js::RegSlot instLocation = funcInfo->AcquireTmpRegister(); |
| |
| this->m_writer.SlotI1(Js::OpCode::LdEnvObj, |
| instLocation, |
| envIndex + Js::FrameDisplay::GetOffsetOfScopes()/sizeof(Js::Var)); |
| |
| if (unwrapWithObj) |
| { |
| this->m_writer.Reg2(Js::OpCode::UnwrapWithObj, instLocation, instLocation); |
| } |
| |
| this->EmitTypeOfFld(funcInfo, propertyId, lhsLocation, instLocation, Js::OpCode::LdFldForTypeOf); |
| |
| funcInfo->ReleaseTmpRegister(instLocation); |
| } |
| else if (scopeLocation != Js::Constants::NoRegister && scopeLocation == funcInfo->frameObjRegister) |
| { |
| this->m_writer.BrLocalProperty(Js::OpCode::BrOnNoLocalProperty, nextLabel, |
| funcInfo->FindOrAddReferencedPropertyId(propertyId)); |
| |
| Assert(!unwrapWithObj); |
| this->EmitTypeOfFld(funcInfo, propertyId, lhsLocation, scopeLocation, Js::OpCode::LdLocalFld); |
| } |
| else |
| { |
| this->m_writer.BrProperty(Js::OpCode::BrOnNoProperty, nextLabel, scopeLocation, |
| funcInfo->FindOrAddReferencedPropertyId(propertyId)); |
| |
| Js::RegSlot unwrappedScopeLocation = Js::Constants::NoRegister; |
| if (unwrapWithObj) |
| { |
| unwrappedScopeLocation = funcInfo->AcquireTmpRegister(); |
| this->m_writer.Reg2(Js::OpCode::UnwrapWithObj, unwrappedScopeLocation, scopeLocation); |
| scopeLocation = unwrappedScopeLocation; |
| } |
| |
| this->EmitTypeOfFld(funcInfo, propertyId, lhsLocation, scopeLocation, Js::OpCode::LdFldForTypeOf); |
| |
| if (unwrapWithObj) |
| { |
| funcInfo->ReleaseTmpRegister(unwrappedScopeLocation); |
| } |
| } |
| |
| this->m_writer.Br(doneLabel); |
| this->m_writer.MarkLabel(nextLabel); |
| } |
| |
| // Arrived at the scope in which the property was defined. |
| if (sym && sym->GetNeedDeclaration() && scope->GetFunc() == funcInfo) |
| { |
| // Ensure this symbol has a slot if it needs one. |
| if (sym->IsInSlot(funcInfo)) |
| { |
| Js::PropertyId slot = sym->EnsureScopeSlot(funcInfo); |
| funcInfo->FindOrAddSlotProfileId(scope, slot); |
| } |
| |
| EmitUseBeforeDeclarationRuntimeError(this, lhsLocation); |
| } |
| else if (sym == nullptr || sym->GetIsGlobal()) |
| { |
| Js::PropertyId propertyId = sym ? sym->EnsurePosition(this) : pid->GetPropertyId(); |
| if (this->flags & fscrEval) |
| { |
| if (funcInfo->byteCodeFunction->GetIsStrictMode() && funcInfo->IsGlobalFunction()) |
| { |
| this->EmitTypeOfFld(funcInfo, propertyId, lhsLocation, funcInfo->frameDisplayRegister, Js::OpCode::ScopedLdFldForTypeOf); |
| } |
| else |
| { |
| this->EmitTypeOfFld(funcInfo, propertyId, lhsLocation, funcInfo->GetEnvRegister(), Js::OpCode::ScopedLdFldForTypeOf); |
| } |
| } |
| else if (this->flags & (fscrImplicitThis | fscrImplicitParents)) |
| { |
| this->EmitTypeOfFld(funcInfo, propertyId, lhsLocation, funcInfo->GetEnvRegister(), Js::OpCode::ScopedLdFldForTypeOf); |
| } |
| else |
| { |
| this->EmitTypeOfFld(funcInfo, propertyId, lhsLocation, ByteCodeGenerator::RootObjectRegister, Js::OpCode::LdRootFldForTypeOf); |
| } |
| } |
| else if (sym->IsInSlot(funcInfo) || envIndex != -1) |
| { |
| // Make sure the property has a slot. This will bump up the size of the slot array if necessary. |
| Js::PropertyId slot = sym->EnsureScopeSlot(funcInfo); |
| Js::ProfileId profileId = funcInfo->FindOrAddSlotProfileId(scope, slot); |
| Js::RegSlot tmpLocation = funcInfo->AcquireTmpRegister(); |
| bool chkBlockVar = NeedCheckBlockVar(sym, scope, funcInfo); |
| Js::OpCode op; |
| |
| op = this->GetLdSlotOp(scope, envIndex, scopeLocation, funcInfo); |
| slot = slot + (sym->GetScope()->GetIsObject() ? 0 : Js::ScopeSlots::FirstSlotIndex); |
| |
| if (envIndex != -1) |
| { |
| this->m_writer.SlotI2(op, tmpLocation, envIndex + Js::FrameDisplay::GetOffsetOfScopes()/sizeof(Js::Var), slot, profileId); |
| } |
| else if (scopeLocation != Js::Constants::NoRegister && |
| (scopeLocation == funcInfo->frameSlotsRegister || scopeLocation == funcInfo->frameObjRegister)) |
| { |
| this->m_writer.SlotI1(op, tmpLocation, slot, profileId); |
| } |
| else if (scope->HasInnerScopeIndex()) |
| { |
| this->m_writer.SlotI2(op, tmpLocation, scope->GetInnerScopeIndex(), slot, profileId); |
| } |
| else |
| { |
| Assert(scope->GetIsObject()); |
| this->m_writer.Slot(op, tmpLocation, scopeLocation, slot, profileId); |
| } |
| |
| if (chkBlockVar) |
| { |
| this->m_writer.Reg1(Js::OpCode::ChkUndecl, tmpLocation); |
| } |
| |
| this->m_writer.Reg2(Js::OpCode::Typeof, lhsLocation, tmpLocation); |
| funcInfo->ReleaseTmpRegister(tmpLocation); |
| } |
| else |
| { |
| this->m_writer.Reg2(Js::OpCode::Typeof, lhsLocation, sym->GetLocation()); |
| } |
| |
| if (fLabelDefined) |
| { |
| this->m_writer.MarkLabel(doneLabel); |
| } |
| } |
| |
| void ByteCodeGenerator::EnsureNoRedeclarations(ParseNode *pnodeBlock, FuncInfo *funcInfo) |
| { |
| // Emit dynamic runtime checks for variable re-declarations. Only necessary for global functions (script or eval). |
| // In eval only var declarations can cause redeclaration, and only in non-strict mode, because let/const variables |
| // remain local to the eval code. |
| |
| Assert(pnodeBlock->nop == knopBlock); |
| Assert(pnodeBlock->sxBlock.blockType == PnodeBlockType::Global || pnodeBlock->sxBlock.scope->GetScopeType() == ScopeType_GlobalEvalBlock); |
| |
| if (!(this->flags & fscrEvalCode)) |
| { |
| IterateBlockScopedVariables(pnodeBlock, [this](ParseNode *pnode) |
| { |
| FuncInfo *funcInfo = this->TopFuncInfo(); |
| Symbol *sym = pnode->sxVar.sym; |
| |
| Assert(sym->GetIsGlobal()); |
| |
| Js::PropertyId propertyId = sym->EnsurePosition(this); |
| |
| this->m_writer.ElementRootU(Js::OpCode::EnsureNoRootFld, funcInfo->FindOrAddReferencedPropertyId(propertyId)); |
| }); |
| } |
| |
| for (ParseNode *pnode = funcInfo->root->sxFnc.pnodeVars; pnode; pnode = pnode->sxVar.pnodeNext) |
| { |
| Symbol* sym = pnode->sxVar.sym; |
| |
| if (sym == nullptr || pnode->sxVar.isBlockScopeFncDeclVar) |
| continue; |
| |
| if (sym->GetIsCatch() || (pnode->nop == knopVarDecl && sym->GetIsBlockVar())) |
| { |
| // The init node was bound to the catch object, because it's inside a catch and has the |
| // same name as the catch object. But we want to define a user var at function scope, |
| // so find the right symbol. (We'll still assign the RHS value to the catch object symbol.) |
| // This also applies to a var declaration in the same scope as a let declaration. |
| |
| // Assert that catch cannot be at function scope and let and var at function scope is redeclaration error. |
| Assert(sym->GetIsCatch() || funcInfo->bodyScope != sym->GetScope()); |
| sym = funcInfo->bodyScope->FindLocalSymbol(sym->GetName()); |
| Assert(sym && !sym->GetIsCatch() && !sym->GetIsBlockVar()); |
| } |
| |
| Assert(sym->GetIsGlobal()); |
| |
| if (sym->GetSymbolType() == STVariable) |
| { |
| Js::PropertyId propertyId = sym->EnsurePosition(this); |
| |
| if (this->flags & fscrEval) |
| { |
| if (!funcInfo->byteCodeFunction->GetIsStrictMode()) |
| { |
| this->m_writer.ScopedProperty(Js::OpCode::ScopedEnsureNoRedeclFld, ByteCodeGenerator::RootObjectRegister, |
| funcInfo->FindOrAddReferencedPropertyId(propertyId)); |
| } |
| } |
| else |
| { |
| this->m_writer.ElementRootU(Js::OpCode::EnsureNoRootRedeclFld, funcInfo->FindOrAddReferencedPropertyId(propertyId)); |
| } |
| } |
| } |
| } |
| |
| void ByteCodeGenerator::RecordAllIntConstants(FuncInfo * funcInfo) |
| { |
| Js::FunctionBody *byteCodeFunction = this->TopFuncInfo()->GetParsedFunctionBody(); |
| funcInfo->constantToRegister.Map([byteCodeFunction](unsigned int val, Js::RegSlot location) |
| { |
| byteCodeFunction->RecordIntConstant(byteCodeFunction->MapRegSlot(location), val); |
| }); |
| } |
| |
| void ByteCodeGenerator::RecordAllStrConstants(FuncInfo * funcInfo) |
| { |
| Js::FunctionBody *byteCodeFunction = this->TopFuncInfo()->GetParsedFunctionBody(); |
| funcInfo->stringToRegister.Map([byteCodeFunction](IdentPtr pid, Js::RegSlot location) |
| { |
| byteCodeFunction->RecordStrConstant(byteCodeFunction->MapRegSlot(location), pid->Psz(), pid->Cch()); |
| }); |
| } |
| |
| void ByteCodeGenerator::RecordAllStringTemplateCallsiteConstants(FuncInfo* funcInfo) |
| { |
| Js::FunctionBody *byteCodeFunction = this->TopFuncInfo()->GetParsedFunctionBody(); |
| funcInfo->stringTemplateCallsiteRegisterMap.Map([byteCodeFunction](ParseNodePtr pnode, Js::RegSlot location) |
| { |
| Js::ScriptContext* scriptContext = byteCodeFunction->GetScriptContext(); |
| Js::JavascriptLibrary* library = scriptContext->GetLibrary(); |
| Js::RecyclableObject* callsiteObject = library->TryGetStringTemplateCallsiteObject(pnode); |
| |
| if (callsiteObject == nullptr) |
| { |
| Js::RecyclableObject* rawArray = ByteCodeGenerator::BuildArrayFromStringList(pnode->sxStrTemplate.pnodeStringRawLiterals, pnode->sxStrTemplate.countStringLiterals, scriptContext); |
| rawArray->Freeze(); |
| |
| callsiteObject = ByteCodeGenerator::BuildArrayFromStringList(pnode->sxStrTemplate.pnodeStringLiterals, pnode->sxStrTemplate.countStringLiterals, scriptContext); |
| callsiteObject->SetPropertyWithAttributes(Js::PropertyIds::raw, rawArray, PropertyNone, nullptr); |
| callsiteObject->Freeze(); |
| |
| library->AddStringTemplateCallsiteObject(callsiteObject); |
| } |
| |
| byteCodeFunction->RecordConstant(byteCodeFunction->MapRegSlot(location), callsiteObject); |
| }); |
| } |
| |
| bool IsApplyArgs(ParseNode* callNode) |
| { |
| ParseNode* target = callNode->sxCall.pnodeTarget; |
| ParseNode* args = callNode->sxCall.pnodeArgs; |
| if ((target != nullptr) && (target->nop == knopDot)) |
| { |
| ParseNode* lhsNode = target->sxBin.pnode1; |
| if ((lhsNode != nullptr) && ((lhsNode->nop == knopDot) || (lhsNode->nop == knopName)) && !IsArguments(lhsNode)) |
| { |
| ParseNode* nameNode = target->sxBin.pnode2; |
| if (nameNode != nullptr) |
| { |
| bool nameIsApply = nameNode->sxPid.PropertyIdFromNameNode() == Js::PropertyIds::apply; |
| if (nameIsApply && args != nullptr && args->nop == knopList) |
| { |
| ParseNode* arg1 = args->sxBin.pnode1; |
| ParseNode* arg2 = args->sxBin.pnode2; |
| if ((arg1 != nullptr) && (arg1->nop == knopThis) && (arg2 != nullptr) && (arg2->nop == knopName) && (arg2->sxPid.sym != nullptr)) |
| { |
| return arg2->sxPid.sym->GetIsArguments(); |
| } |
| } |
| } |
| } |
| } |
| return false; |
| } |
| |
| void PostCheckApplyEnclosesArgs(ParseNode* pnode, ByteCodeGenerator* byteCodeGenerator, ApplyCheck* applyCheck) |
| { |
| if ((pnode == nullptr) || (!applyCheck->matches)) |
| { |
| return; |
| } |
| |
| if (pnode->nop == knopCall) |
| { |
| if ((!pnode->isUsed) && IsApplyArgs(pnode)) |
| { |
| if (!applyCheck->insideApplyCall) |
| { |
| applyCheck->matches = false; |
| } |
| applyCheck->insideApplyCall = false; |
| } |
| } |
| } |
| |
| void CheckApplyEnclosesArgs(ParseNode* pnode, ByteCodeGenerator* byteCodeGenerator, ApplyCheck* applyCheck) |
| { |
| if ((pnode == nullptr) || (!applyCheck->matches)) |
| { |
| return; |
| } |
| |
| switch (pnode->nop) |
| { |
| case knopName: |
| { |
| Symbol* sym = pnode->sxPid.sym; |
| if (sym != nullptr) |
| { |
| if (sym->GetIsArguments()) |
| { |
| if (!applyCheck->insideApplyCall) |
| { |
| applyCheck->matches = false; |
| } |
| } |
| } |
| break; |
| } |
| |
| case knopCall: |
| if ((!pnode->isUsed) && IsApplyArgs(pnode)) |
| { |
| // no nested apply calls |
| if (applyCheck->insideApplyCall) |
| { |
| applyCheck->matches = false; |
| } |
| else |
| { |
| applyCheck->insideApplyCall = true; |
| applyCheck->sawApply = true; |
| pnode->sxCall.isApplyCall = true; |
| } |
| } |
| break; |
| } |
| } |
| |
| unsigned int CountArguments(ParseNode *pnode, BOOL *pSideEffect = nullptr) |
| { |
| // If the caller passed us a pSideEffect, it wants to know whether there are potential |
| // side-effects in the argument list. We need to know this so that the call target |
| // operands can be preserved if necessary. |
| // For now, treat any non-leaf op as a potential side-effect. This causes no detectable slowdowns, |
| // but we can be more precise if we need to be. |
| if (pSideEffect) |
| { |
| *pSideEffect = FALSE; |
| } |
| |
| unsigned int argCount = 1; |
| if (pnode != nullptr) |
| { |
| while (pnode->nop == knopList) |
| { |
| argCount++; |
| if (pSideEffect && !(ParseNode::Grfnop(pnode->sxBin.pnode1->nop) & fnopLeaf)) |
| { |
| *pSideEffect = TRUE; |
| } |
| pnode = pnode->sxBin.pnode2; |
| } |
| argCount++; |
| if (pSideEffect && !(ParseNode::Grfnop(pnode->nop) & fnopLeaf)) |
| { |
| *pSideEffect = TRUE; |
| } |
| } |
| |
| return argCount; |
| } |
| |
| void SaveOpndValue(ParseNode *pnode, FuncInfo *funcInfo) |
| { |
| // Save a local name to a register other than its home location. |
| // This guards against side-effects in cases like x.foo(x = bar()). |
| Symbol *sym = nullptr; |
| if (pnode->nop == knopName) |
| { |
| sym = pnode->sxPid.sym; |
| } |
| else if (pnode->nop == knopComputedName) |
| { |
| ParseNode *pnode1 = pnode->sxUni.pnode1; |
| if (pnode1->nop == knopName) |
| { |
| sym = pnode1->sxPid.sym; |
| } |
| } |
| |
| if (sym == nullptr) |
| { |
| return; |
| } |
| |
| // If the target is a local being kept in its home location, |
| // protect the target's value in the event the home location is overwritten. |
| if (pnode->location != Js::Constants::NoRegister && |
| sym->GetScope()->GetFunc() == funcInfo && |
| pnode->location == sym->GetLocation()) |
| { |
| pnode->location = funcInfo->AcquireTmpRegister(); |
| } |
| } |
| |
| void ByteCodeGenerator::StartStatement(ParseNode* node) |
| { |
| Assert(TopFuncInfo() != nullptr); |
| m_writer.StartStatement(node, TopFuncInfo()->curTmpReg - TopFuncInfo()->firstTmpReg); |
| } |
| |
| void ByteCodeGenerator::EndStatement(ParseNode* node) |
| { |
| m_writer.EndStatement(node); |
| } |
| |
| void ByteCodeGenerator::StartSubexpression(ParseNode* node) |
| { |
| Assert(TopFuncInfo() != nullptr); |
| m_writer.StartSubexpression(node); |
| } |
| |
| void ByteCodeGenerator::EndSubexpression(ParseNode* node) |
| { |
| m_writer.EndSubexpression(node); |
| } |
| |
| void EmitReference(ParseNode *pnode, ByteCodeGenerator *byteCodeGenerator, FuncInfo *funcInfo) |
| { |
| // Generate code for the LHS of an assignment. |
| switch (pnode->nop) |
| { |
| case knopDot: |
| Emit(pnode->sxBin.pnode1, byteCodeGenerator, funcInfo, false); |
| break; |
| |
| case knopIndex: |
| Emit(pnode->sxBin.pnode1, byteCodeGenerator, funcInfo, false); |
| Emit(pnode->sxBin.pnode2, byteCodeGenerator, funcInfo, false); |
| break; |
| |
| case knopName: |
| break; |
| |
| case knopArrayPattern: |
| case knopObjectPattern: |
| break; |
| |
| case knopCall: |
| case knopNew: |
| // Emit the operands of a call that will be used as a LHS. |
| // These have to be emitted before the RHS, but they have to persist until |
| // the end of the expression. |
| // Emit the call target operands first. |
| switch (pnode->sxCall.pnodeTarget->nop) |
| { |
| case knopDot: |
| case knopIndex: |
| funcInfo->AcquireLoc(pnode->sxCall.pnodeTarget); |
| EmitReference(pnode->sxCall.pnodeTarget, byteCodeGenerator, funcInfo); |
| break; |
| |
| case knopName: |
| { |
| Symbol *sym = pnode->sxCall.pnodeTarget->sxPid.sym; |
| if (!sym || sym->GetLocation() == Js::Constants::NoRegister) |
| { |
| funcInfo->AcquireLoc(pnode->sxCall.pnodeTarget); |
| } |
| if (sym && (sym->IsInSlot(funcInfo) || sym->GetScope()->GetFunc() != funcInfo)) |
| { |
| // Can't get the value from the assigned register, so load it here. |
| EmitLoad(pnode->sxCall.pnodeTarget, byteCodeGenerator, funcInfo); |
| } |
| else |
| { |
| // EmitLoad will check for needsDeclaration and emit the Use Before Declaration error |
| // bytecode op as necessary, but EmitReference does not check this (by design). So we |
| // must manually check here. |
| EmitUseBeforeDeclaration(pnode->sxCall.pnodeTarget->sxPid.sym, byteCodeGenerator, funcInfo); |
| EmitReference(pnode->sxCall.pnodeTarget, byteCodeGenerator, funcInfo); |
| } |
| break; |
| } |
| default: |
| EmitLoad(pnode->sxCall.pnodeTarget, byteCodeGenerator, funcInfo); |
| break; |
| } |
| |
| // Now the arg list. We evaluate everything now and emit the ArgOut's later. |
| if (pnode->sxCall.pnodeArgs) |
| { |
| ParseNode *pnodeArg = pnode->sxCall.pnodeArgs; |
| while (pnodeArg->nop == knopList) |
| { |
| Emit(pnodeArg->sxBin.pnode1, byteCodeGenerator, funcInfo, false); |
| pnodeArg = pnodeArg->sxBin.pnode2; |
| } |
| Emit(pnodeArg, byteCodeGenerator, funcInfo, false); |
| } |
| break; |
| |
| default: |
| Emit(pnode, byteCodeGenerator, funcInfo, false); |
| break; |
| } |
| } |
| |
| void EmitGetIterator(Js::RegSlot iteratorLocation, Js::RegSlot iterableLocation, ByteCodeGenerator* byteCodeGenerator, FuncInfo* funcInfo); |
| void EmitIteratorNext(Js::RegSlot itemLocation, Js::RegSlot iteratorLocation, Js::RegSlot nextInputLocation, ByteCodeGenerator* byteCodeGenerator, FuncInfo* funcInfo); |
| void EmitIteratorComplete(Js::RegSlot doneLocation, Js::RegSlot iteratorResultLocation, ByteCodeGenerator* byteCodeGenerator, FuncInfo* funcInfo); |
| void EmitIteratorValue(Js::RegSlot valueLocation, Js::RegSlot iteratorResultLocation, ByteCodeGenerator* byteCodeGenerator, FuncInfo* funcInfo); |
| |
| void EmitDestructuredElement(ParseNode *elem, Js::RegSlot sourceLocation, ByteCodeGenerator* byteCodeGenerator, FuncInfo *funcInfo) |
| { |
| switch (elem->nop) |
| { |
| case knopVarDecl: |
| case knopLetDecl: |
| case knopConstDecl: |
| // We manually need to set NeedDeclaration since the node won't be visited. |
| elem->sxVar.sym->SetNeedDeclaration(false); |
| break; |
| |
| default: |
| EmitReference(elem, byteCodeGenerator, funcInfo); |
| } |
| |
| EmitAssignment(nullptr, elem, sourceLocation, byteCodeGenerator, funcInfo); |
| funcInfo->ReleaseReference(elem); |
| } |
| |
| void EmitDestructuredRestArray(ParseNode *elem, Js::RegSlot iteratorLocation, ByteCodeGenerator *byteCodeGenerator, FuncInfo *funcInfo) |
| { |
| Js::RegSlot restArrayLocation = funcInfo->AcquireTmpRegister(); |
| byteCodeGenerator->Writer()->Reg1Unsigned1( |
| Js::OpCode::NewScArray, |
| restArrayLocation, |
| ByteCodeGenerator::DefaultArraySize); |
| |
| // BytecodeGen can't convey to IRBuilder that some of the temporaries used here are live. When we |
| // have a rest parameter, a counter is used in a loop for the array index, but there is no way to |
| // convey this is live on the back edge. |
| // As a workaround, we have a persistent var reg that is used for the loop counter |
| Js::RegSlot counterLocation = elem->location; |
| // TODO[ianhall]: Is calling EnregisterConstant() during Emit phase allowed? |
| Js::RegSlot zeroConstantReg = byteCodeGenerator->EnregisterConstant(0); |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::Ld_A, counterLocation, zeroConstantReg); |
| |
| // loopTop: |
| Js::ByteCodeLabel loopTop = byteCodeGenerator->Writer()->DefineLabel(); |
| byteCodeGenerator->Writer()->MarkLabel(loopTop); |
| |
| Js::RegSlot itemLocation = funcInfo->AcquireTmpRegister(); |
| |
| EmitIteratorNext(itemLocation, iteratorLocation, Js::Constants::NoRegister, byteCodeGenerator, funcInfo); |
| |
| Js::RegSlot doneLocation = funcInfo->AcquireTmpRegister(); |
| EmitIteratorComplete(doneLocation, itemLocation, byteCodeGenerator, funcInfo); |
| |
| Js::ByteCodeLabel iteratorDone = byteCodeGenerator->Writer()->DefineLabel(); |
| byteCodeGenerator->Writer()->BrReg1(Js::OpCode::BrTrue_A, iteratorDone, doneLocation); |
| |
| Js::RegSlot valueLocation = funcInfo->AcquireTmpRegister(); |
| EmitIteratorValue(valueLocation, itemLocation, byteCodeGenerator, funcInfo); |
| |
| byteCodeGenerator->Writer()->Element( |
| ByteCodeGenerator::GetStElemIOpCode(funcInfo), |
| valueLocation, restArrayLocation, counterLocation); |
| funcInfo->ReleaseTmpRegister(valueLocation); |
| funcInfo->ReleaseTmpRegister(doneLocation); |
| funcInfo->ReleaseTmpRegister(itemLocation); |
| |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::Incr_A, counterLocation, counterLocation); |
| byteCodeGenerator->Writer()->Br(loopTop); |
| |
| // iteratorDone: |
| byteCodeGenerator->Writer()->MarkLabel(iteratorDone); |
| |
| ParseNode *restElem = elem->sxUni.pnode1; |
| EmitDestructuredElement(restElem, restArrayLocation, byteCodeGenerator, funcInfo); |
| |
| funcInfo->ReleaseTmpRegister(restArrayLocation); |
| } |
| |
| /* |
| EmitDestructuredArray(lhsArray, rhs): |
| iterator = rhs[@@iterator] |
| |
| if lhsArray empty |
| return |
| |
| for each element in lhsArray except rest |
| value = iterator.next() |
| if element is a nested destructured array |
| EmitDestructuredArray(element, value) |
| else |
| if value is undefined and there is an initializer |
| evaluate initializer |
| evaluate element reference |
| element = initializer |
| else |
| element = value |
| |
| if lhsArray has a rest element |
| rest = [] |
| while iterator is not done |
| value = iterator.next() |
| rest.append(value) |
| */ |
| void EmitDestructuredArray( |
| ParseNode *lhs, |
| Js::RegSlot rhsLocation, |
| ByteCodeGenerator *byteCodeGenerator, |
| FuncInfo *funcInfo) |
| { |
| byteCodeGenerator->StartStatement(lhs); |
| Js::RegSlot iteratorLocation = funcInfo->AcquireTmpRegister(); |
| |
| EmitGetIterator(iteratorLocation, rhsLocation, byteCodeGenerator, funcInfo); |
| |
| Assert(lhs->nop == knopArrayPattern); |
| ParseNode *list = lhs->sxArrLit.pnode1; |
| |
| if (list == nullptr) |
| { |
| // No elements to bind or assign. |
| funcInfo->ReleaseTmpRegister(iteratorLocation); |
| return; |
| } |
| |
| ParseNode *elem = nullptr; |
| while (list != nullptr) |
| { |
| ParseNode *init = nullptr; |
| |
| if (list->nop == knopList) |
| { |
| elem = list->sxBin.pnode1; |
| } |
| else |
| { |
| elem = list; |
| } |
| |
| if (elem->nop == knopEllipsis |
| || (elem->nop == knopEmpty && list->nop == knopEmpty)) |
| { |
| // Rest and last empty slot do not require any more processing. |
| break; |
| } |
| |
| switch (elem->nop) |
| { |
| case knopAsg: |
| // An assignment node will always have an initializer |
| init = elem->sxBin.pnode2; |
| elem = elem->sxBin.pnode1; |
| break; |
| |
| case knopVarDecl: |
| case knopLetDecl: |
| case knopConstDecl: |
| init = elem->sxVar.pnodeInit; |
| break; |
| |
| default: |
| break; |
| } |
| |
| |
| byteCodeGenerator->StartStatement(elem); |
| |
| Js::RegSlot itemLocation = funcInfo->AcquireTmpRegister(); |
| |
| EmitIteratorNext(itemLocation, iteratorLocation, Js::Constants::NoRegister, byteCodeGenerator, funcInfo); |
| |
| if (elem->nop == knopEmpty) |
| { |
| // Missing elements only require a next call. |
| funcInfo->ReleaseTmpRegister(itemLocation); |
| if (list->nop == knopList) |
| { |
| list = list->sxBin.pnode2; |
| continue; |
| } |
| else |
| { |
| break; |
| } |
| } |
| |
| Js::RegSlot doneLocation = funcInfo->AcquireTmpRegister(); |
| EmitIteratorComplete(doneLocation, itemLocation, byteCodeGenerator, funcInfo); |
| |
| // If the iterator hasn't completed, skip assigning undefined. |
| Js::ByteCodeLabel iteratorAlreadyDone = byteCodeGenerator->Writer()->DefineLabel(); |
| byteCodeGenerator->Writer()->BrReg1(Js::OpCode::BrTrue_A, iteratorAlreadyDone, doneLocation); |
| funcInfo->ReleaseTmpRegister(doneLocation); |
| |
| // We're not done with the iterator, so assign the .next() value. |
| Js::RegSlot valueLocation = funcInfo->AcquireTmpRegister(); |
| EmitIteratorValue(valueLocation, itemLocation, byteCodeGenerator, funcInfo); |
| Js::ByteCodeLabel beforeDefaultAssign = byteCodeGenerator->Writer()->DefineLabel(); |
| byteCodeGenerator->Writer()->Br(beforeDefaultAssign); |
| |
| // iteratorAlreadyDone: |
| byteCodeGenerator->Writer()->MarkLabel(iteratorAlreadyDone); |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::Ld_A, valueLocation, funcInfo->undefinedConstantRegister); |
| |
| // beforeDefaultAssign: |
| byteCodeGenerator->Writer()->MarkLabel(beforeDefaultAssign); |
| |
| if (elem->IsPattern()) |
| { |
| // If we get an undefined value and have an initializer, use it in place of undefined. |
| if (init != nullptr) |
| { |
| /* |
| the IR builder uses two symbols for a temp register in the if else path |
| R9 <- R3 |
| if (...) |
| R9 <- R2 |
| R10 = R9.<property> // error -> IR creates a new lifetime for the if path, and the direct path dest is not referenced |
| hence we have to create a new temp |
| |
| TEMP REG USED TO FIX THIS PRODUCES THIS |
| R9 <- R3 |
| if (BrEq_A R9, R3) |
| R10 <- R2 : |
| else |
| R10 <- R9 : skipdefault |
| ... = R10[@@iterator] : loadIter |
| */ |
| |
| // Temp Register |
| Js::RegSlot valueLocationTmp = funcInfo->AcquireTmpRegister(); |
| byteCodeGenerator->StartStatement(init); |
| |
| Js::ByteCodeLabel skipDefault = byteCodeGenerator->Writer()->DefineLabel(); |
| Js::ByteCodeLabel loadIter = byteCodeGenerator->Writer()->DefineLabel(); |
| |
| // check value is undefined |
| byteCodeGenerator->Writer()->BrReg2(Js::OpCode::BrSrNeq_A, skipDefault, valueLocation, funcInfo->undefinedConstantRegister); |
| |
| // Evaluate the default expression and assign it. |
| Emit(init, byteCodeGenerator, funcInfo, false); |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::Ld_A, valueLocationTmp, init->location); |
| funcInfo->ReleaseLoc(init); |
| |
| // jmp to loadIter |
| byteCodeGenerator->Writer()->Br(loadIter); |
| |
| // skipDefault: |
| byteCodeGenerator->Writer()->MarkLabel(skipDefault); |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::Ld_A, valueLocationTmp, valueLocation); |
| |
| // loadIter: |
| // @@iterator |
| byteCodeGenerator->Writer()->MarkLabel(loadIter); |
| byteCodeGenerator->EndStatement(init); |
| |
| if (elem->nop == knopObjectPattern) |
| { |
| EmitDestructuredObject(elem, valueLocationTmp, byteCodeGenerator, funcInfo); |
| } |
| else |
| { |
| // Recursively emit a destructured array using the current .next() as the RHS. |
| EmitDestructuredArray(elem, valueLocationTmp, byteCodeGenerator, funcInfo); |
| } |
| |
| funcInfo->ReleaseTmpRegister(valueLocationTmp); |
| } |
| else |
| { |
| if (elem->nop == knopObjectPattern) |
| { |
| EmitDestructuredObject(elem, valueLocation, byteCodeGenerator, funcInfo); |
| } |
| else |
| { |
| // Recursively emit a destructured array using the current .next() as the RHS. |
| EmitDestructuredArray(elem, valueLocation, byteCodeGenerator, funcInfo); |
| } |
| } |
| } |
| else |
| { |
| EmitDestructuredValueOrInitializer(elem, valueLocation, init, byteCodeGenerator, funcInfo); |
| } |
| |
| funcInfo->ReleaseTmpRegister(valueLocation); |
| funcInfo->ReleaseTmpRegister(itemLocation); |
| |
| byteCodeGenerator->EndStatement(elem); |
| |
| if (list->nop == knopList) |
| { |
| list = list->sxBin.pnode2; |
| } |
| else |
| { |
| break; |
| } |
| } |
| |
| // If we saw a rest element, emit the rest array. |
| if (elem != nullptr && elem->nop == knopEllipsis) |
| { |
| EmitDestructuredRestArray(elem, iteratorLocation, byteCodeGenerator, funcInfo); |
| } |
| funcInfo->ReleaseTmpRegister(iteratorLocation); |
| |
| byteCodeGenerator->EndStatement(lhs); |
| } |
| |
| void EmitNameInvoke(Js::RegSlot lhsLocation, |
| Js::RegSlot objectLocation, |
| ParseNodePtr nameNode, |
| ByteCodeGenerator* byteCodeGenerator, |
| FuncInfo* funcInfo) |
| { |
| Assert(nameNode != nullptr); |
| if (nameNode->nop == knopComputedName) |
| { |
| ParseNodePtr pnode1 = nameNode->sxUni.pnode1; |
| Emit(pnode1, byteCodeGenerator, funcInfo, false/*isConstructorCall*/); |
| |
| byteCodeGenerator->Writer()->Element(Js::OpCode::LdElemI_A, lhsLocation, objectLocation, pnode1->location); |
| funcInfo->ReleaseLoc(pnode1); |
| } |
| else |
| { |
| Assert(nameNode->nop == knopName || nameNode->nop == knopStr); |
| Symbol *sym = nameNode->sxPid.sym; |
| Js::PropertyId propertyId = sym ? sym->EnsurePosition(byteCodeGenerator) : nameNode->sxPid.pid->GetPropertyId(); |
| |
| uint cacheId = funcInfo->FindOrAddInlineCacheId(objectLocation, propertyId, false/*isLoadMethod*/, false/*isStore*/); |
| byteCodeGenerator->Writer()->PatchableProperty(Js::OpCode::LdFld, lhsLocation, objectLocation, cacheId); |
| } |
| } |
| |
| void EmitDestructuredValueOrInitializer(ParseNodePtr lhsElementNode, |
| Js::RegSlot rhsLocation, |
| ParseNodePtr initializer, |
| ByteCodeGenerator *byteCodeGenerator, |
| FuncInfo *funcInfo) |
| { |
| // If we have initializer we need to see if the destructured value is undefined or not - if it is undefined we need to assign initializer |
| |
| Js::ByteCodeLabel useDefault = -1; |
| Js::ByteCodeLabel end = -1; |
| Js::RegSlot rhsLocationTmp = rhsLocation; |
| |
| if (initializer != nullptr) |
| { |
| rhsLocationTmp = funcInfo->AcquireTmpRegister(); |
| |
| useDefault = byteCodeGenerator->Writer()->DefineLabel(); |
| end = byteCodeGenerator->Writer()->DefineLabel(); |
| |
| byteCodeGenerator->Writer()->BrReg2(Js::OpCode::BrSrEq_A, useDefault, rhsLocation, funcInfo->undefinedConstantRegister); |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::Ld_A, rhsLocationTmp, rhsLocation); |
| |
| byteCodeGenerator->Writer()->Br(end); |
| byteCodeGenerator->Writer()->MarkLabel(useDefault); |
| |
| Emit(initializer, byteCodeGenerator, funcInfo, false/*isConstructorCall*/); |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::Ld_A, rhsLocationTmp, initializer->location); |
| funcInfo->ReleaseLoc(initializer); |
| |
| byteCodeGenerator->Writer()->MarkLabel(end); |
| } |
| |
| if (lhsElementNode->nop == knopArrayPattern) |
| { |
| EmitDestructuredArray(lhsElementNode, rhsLocationTmp, byteCodeGenerator, funcInfo); |
| } |
| else if (lhsElementNode->nop == knopObjectPattern) |
| { |
| EmitDestructuredObject(lhsElementNode, rhsLocationTmp, byteCodeGenerator, funcInfo); |
| } |
| else |
| { |
| EmitDestructuredElement(lhsElementNode, rhsLocationTmp, byteCodeGenerator, funcInfo); |
| } |
| |
| if (initializer != nullptr) |
| { |
| funcInfo->ReleaseTmpRegister(rhsLocationTmp); |
| } |
| } |
| |
| void EmitDestructuredObjectMember(ParseNodePtr memberNode, |
| Js::RegSlot rhsLocation, |
| ByteCodeGenerator *byteCodeGenerator, |
| FuncInfo *funcInfo) |
| { |
| Assert(memberNode->nop == knopObjectPatternMember); |
| |
| Js::RegSlot nameLocation = funcInfo->AcquireTmpRegister(); |
| EmitNameInvoke(nameLocation, rhsLocation, memberNode->sxBin.pnode1, byteCodeGenerator, funcInfo); |
| |
| // Imagine we are transforming |
| // {x:x1} = {} to x1 = {}.x (here x1 is the second node of the member but that is our lhsnode) |
| |
| ParseNodePtr lhsElementNode = memberNode->sxBin.pnode2; |
| ParseNodePtr init = nullptr; |
| if (lhsElementNode->IsVarLetOrConst()) |
| { |
| init = lhsElementNode->sxVar.pnodeInit; |
| } |
| else if (lhsElementNode->nop == knopAsg) |
| { |
| init = lhsElementNode->sxBin.pnode2; |
| lhsElementNode = lhsElementNode->sxBin.pnode1; |
| } |
| |
| EmitDestructuredValueOrInitializer(lhsElementNode, nameLocation, init, byteCodeGenerator, funcInfo); |
| |
| funcInfo->ReleaseTmpRegister(nameLocation); |
| } |
| |
| void EmitDestructuredObject(ParseNode *lhs, |
| Js::RegSlot rhsLocationOrig, |
| ByteCodeGenerator *byteCodeGenerator, |
| FuncInfo *funcInfo) |
| { |
| Assert(lhs->nop == knopObjectPattern); |
| ParseNodePtr pnode1 = lhs->sxUni.pnode1; |
| |
| byteCodeGenerator->StartStatement(lhs); |
| |
| Js::ByteCodeLabel skipThrow = byteCodeGenerator->Writer()->DefineLabel(); |
| Js::RegSlot rhsLocation = funcInfo->AcquireTmpRegister(); |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::Ld_A, rhsLocation, rhsLocationOrig); |
| byteCodeGenerator->Writer()->BrReg2(Js::OpCode::BrNeq_A, skipThrow, rhsLocation, funcInfo->undefinedConstantRegister); |
| byteCodeGenerator->Writer()->W1(Js::OpCode::RuntimeTypeError, SCODE_CODE(JSERR_ObjectCoercible)); |
| byteCodeGenerator->Writer()->MarkLabel(skipThrow); |
| |
| if (pnode1 != nullptr) |
| { |
| Assert(pnode1->nop == knopList || pnode1->nop == knopObjectPatternMember); |
| |
| ParseNodePtr current = pnode1; |
| while (current->nop == knopList) |
| { |
| ParseNodePtr memberNode = current->sxBin.pnode1; |
| EmitDestructuredObjectMember(memberNode, rhsLocation, byteCodeGenerator, funcInfo); |
| current = current->sxBin.pnode2; |
| } |
| EmitDestructuredObjectMember(current, rhsLocation, byteCodeGenerator, funcInfo); |
| } |
| |
| funcInfo->ReleaseTmpRegister(rhsLocation); |
| byteCodeGenerator->EndStatement(lhs); |
| } |
| |
| void EmitAssignment( |
| ParseNode *asgnNode, |
| ParseNode *lhs, |
| Js::RegSlot rhsLocation, |
| ByteCodeGenerator *byteCodeGenerator, |
| FuncInfo *funcInfo) |
| { |
| switch (lhs->nop) |
| { |
| // assignment to a local or global variable |
| case knopVarDecl: |
| case knopLetDecl: |
| case knopConstDecl: |
| { |
| Symbol *sym = lhs->sxVar.sym; |
| Assert(sym != nullptr); |
| byteCodeGenerator->EmitPropStore(rhsLocation, sym, nullptr, funcInfo, lhs->nop == knopLetDecl, lhs->nop == knopConstDecl); |
| break; |
| } |
| |
| case knopName: |
| { |
| byteCodeGenerator->EmitPropStore(rhsLocation, lhs->sxPid.sym, lhs->sxPid.pid, funcInfo); |
| break; |
| } |
| |
| // x.y = |
| case knopDot: |
| { |
| // PutValue(x, "y", rhs) |
| Js::PropertyId propertyId = lhs->sxBin.pnode2->sxPid.PropertyIdFromNameNode(); |
| |
| uint cacheId = funcInfo->FindOrAddInlineCacheId(lhs->sxBin.pnode1->location, propertyId, false, true); |
| if (lhs->sxBin.pnode1->nop == knopSuper) |
| { |
| byteCodeGenerator->Writer()->PatchablePropertyWithThisPtr(Js::OpCode::StSuperFld, rhsLocation, lhs->sxBin.pnode1->location, funcInfo->thisPointerRegister, cacheId); |
| } |
| else |
| { |
| byteCodeGenerator->Writer()->PatchableProperty( |
| ByteCodeGenerator::GetStFldOpCode(funcInfo, false, false, false, false), rhsLocation, lhs->sxBin.pnode1->location, cacheId); |
| } |
| |
| break; |
| } |
| |
| case knopIndex: |
| { |
| byteCodeGenerator->Writer()->Element( |
| ByteCodeGenerator::GetStElemIOpCode(funcInfo), |
| rhsLocation, lhs->sxBin.pnode1->location, lhs->sxBin.pnode2->location); |
| break; |
| } |
| |
| case knopObjectPattern: |
| { |
| Assert(byteCodeGenerator->IsES6DestructuringEnabled()); |
| // Copy the rhs value to be the result of the assignment if needed. |
| if (asgnNode != nullptr) |
| { |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::Ld_A, asgnNode->location, rhsLocation); |
| } |
| return EmitDestructuredObject(lhs, rhsLocation, byteCodeGenerator, funcInfo); |
| } |
| |
| case knopArrayPattern: |
| { |
| Assert(byteCodeGenerator->IsES6DestructuringEnabled()); |
| // Copy the rhs value to be the result of the assignment if needed. |
| if (asgnNode != nullptr) |
| { |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::Ld_A, asgnNode->location, rhsLocation); |
| } |
| return EmitDestructuredArray(lhs, rhsLocation, byteCodeGenerator, funcInfo); |
| } |
| |
| case knopArray: |
| case knopObject: |
| // Assignment to array/object can get through to byte code gen when the parser fails to convert destructuring |
| // assignment to pattern (because of structural mismatch between LHS & RHS?). Revisit when we nail |
| // down early vs. runtime errors for destructuring. |
| byteCodeGenerator->Writer()->W1(Js::OpCode::RuntimeReferenceError, SCODE_CODE(JSERR_CantAssignTo)); |
| break; |
| |
| default: |
| Assert(!PHASE_ON1(Js::EarlyReferenceErrorsPhase)); |
| byteCodeGenerator->Writer()->W1(Js::OpCode::RuntimeReferenceError, SCODE_CODE(JSERR_CantAssignTo)); |
| break; |
| } |
| |
| if (asgnNode != nullptr) |
| { |
| // We leave it up to the caller to pass this node only if the assignment expression is used. |
| if (asgnNode->location != rhsLocation) |
| { |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::Ld_A, asgnNode->location, rhsLocation); |
| } |
| } |
| } |
| |
| void EmitLoad( |
| ParseNode *lhs, |
| ByteCodeGenerator *byteCodeGenerator, |
| FuncInfo *funcInfo) |
| { |
| // Emit the instructions to load the value into the LHS location. Do not assign/free any temps |
| // in the process. |
| // We usually get here as part of an op-equiv expression: x.y += z; |
| // In such a case, x has to be emitted first, then the value of x.y loaded (by this function), then z emitted. |
| switch (lhs->nop) |
| { |
| |
| // load of a local or global variable |
| case knopName: |
| { |
| funcInfo->AcquireLoc(lhs); |
| byteCodeGenerator->EmitPropLoad(lhs->location, lhs->sxPid.sym, lhs->sxPid.pid, funcInfo); |
| break; |
| } |
| |
| // = x.y |
| case knopDot: |
| { |
| // get field id for "y" |
| Js::PropertyId propertyId = lhs->sxBin.pnode2->sxPid.PropertyIdFromNameNode(); |
| funcInfo->AcquireLoc(lhs); |
| EmitReference(lhs, byteCodeGenerator, funcInfo); |
| uint cacheId = funcInfo->FindOrAddInlineCacheId(lhs->sxBin.pnode1->location, propertyId, false, false); |
| byteCodeGenerator->Writer()->PatchableProperty(Js::OpCode::LdFld, lhs->location, lhs->sxBin.pnode1->location, cacheId); |
| break; |
| } |
| |
| case knopIndex: |
| funcInfo->AcquireLoc(lhs); |
| EmitReference(lhs, byteCodeGenerator, funcInfo); |
| byteCodeGenerator->Writer()->Element( |
| Js::OpCode::LdElemI_A, lhs->location, lhs->sxBin.pnode1->location, lhs->sxBin.pnode2->location); |
| break; |
| |
| // f(x) += |
| case knopCall: |
| funcInfo->AcquireLoc(lhs); |
| EmitReference(lhs, byteCodeGenerator, funcInfo); |
| EmitCall(lhs, /*rhs=*/ Js::Constants::NoRegister, byteCodeGenerator, funcInfo, /*fReturnValue=*/ false, /*fEvaluateComponents=*/ false, /*fHasNewTarget=*/ false); |
| break; |
| |
| default: |
| funcInfo->AcquireLoc(lhs); |
| Emit(lhs, byteCodeGenerator, funcInfo, false); |
| break; |
| } |
| } |
| |
| void EmitList(ParseNode *pnode, ByteCodeGenerator *byteCodeGenerator, FuncInfo *funcInfo) |
| { |
| if (pnode != nullptr) |
| { |
| while (pnode->nop == knopList) |
| { |
| byteCodeGenerator->EmitTopLevelStatement(pnode->sxBin.pnode1, funcInfo, false); |
| pnode = pnode->sxBin.pnode2; |
| } |
| byteCodeGenerator->EmitTopLevelStatement(pnode, funcInfo, false); |
| } |
| } |
| |
| void EmitSpreadArgToListBytecodeInstr(ByteCodeGenerator *byteCodeGenerator, FuncInfo *funcInfo, Js::RegSlot argLoc, Js::ProfileId callSiteId, Js::ArgSlot &argIndex) |
| { |
| Js::RegSlot regVal = funcInfo->AcquireTmpRegister(); |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::LdCustomSpreadIteratorList, regVal, argLoc); |
| byteCodeGenerator->Writer()->ArgOut<true>(++argIndex, regVal, callSiteId); |
| funcInfo->ReleaseTmpRegister(regVal); |
| } |
| |
| size_t EmitArgs( |
| ParseNode *pnode, |
| BOOL fAssignRegs, |
| ByteCodeGenerator *byteCodeGenerator, |
| FuncInfo *funcInfo, |
| Js::ProfileId callSiteId, |
| Js::AuxArray<uint32> *spreadIndices = nullptr |
| ) |
| { |
| Js::ArgSlot argIndex = 0; |
| Js::ArgSlot spreadIndex = 0; |
| |
| if (pnode != nullptr) |
| { |
| while (pnode->nop == knopList) |
| { |
| // If this is a put, the arguments have already been evaluated (see EmitReference). |
| // We just need to emit the ArgOut instructions. |
| if (fAssignRegs) |
| { |
| Emit(pnode->sxBin.pnode1, byteCodeGenerator, funcInfo, false); |
| } |
| |
| if (pnode->sxBin.pnode1->nop == knopEllipsis) |
| { |
| Assert(spreadIndices != nullptr); |
| spreadIndices->elements[spreadIndex++] = argIndex + 1; // account for 'this' |
| EmitSpreadArgToListBytecodeInstr(byteCodeGenerator, funcInfo, pnode->sxBin.pnode1->location, callSiteId, argIndex); |
| } |
| else |
| { |
| byteCodeGenerator->Writer()->ArgOut<true>(++argIndex, pnode->sxBin.pnode1->location, callSiteId); |
| } |
| if (fAssignRegs) |
| { |
| funcInfo->ReleaseLoc(pnode->sxBin.pnode1); |
| } |
| |
| pnode = pnode->sxBin.pnode2; |
| } |
| |
| // If this is a put, the call target has already been evaluated (see EmitReference). |
| if (fAssignRegs) |
| { |
| Emit(pnode, byteCodeGenerator, funcInfo, false); |
| } |
| |
| if (pnode->nop == knopEllipsis) |
| { |
| Assert(spreadIndices != nullptr); |
| spreadIndices->elements[spreadIndex++] = argIndex + 1; // account for 'this' |
| EmitSpreadArgToListBytecodeInstr(byteCodeGenerator, funcInfo, pnode->location, callSiteId, argIndex); |
| } |
| else |
| { |
| byteCodeGenerator->Writer()->ArgOut<true>(++argIndex, pnode->location, callSiteId); |
| } |
| |
| if (fAssignRegs) |
| { |
| funcInfo->ReleaseLoc(pnode); |
| } |
| } |
| |
| return argIndex; |
| } |
| |
| void EmitArgListStart( |
| Js::RegSlot thisLocation, |
| ByteCodeGenerator *byteCodeGenerator, |
| FuncInfo *funcInfo, |
| Js::ProfileId callSiteId) |
| { |
| if (thisLocation != Js::Constants::NoRegister) |
| { |
| // Emit the "this" object. |
| byteCodeGenerator->Writer()->ArgOut<true>(0, thisLocation, callSiteId); |
| } |
| } |
| |
| Js::ArgSlot EmitArgListEnd( |
| ParseNode *pnode, |
| Js::RegSlot rhsLocation, |
| Js::RegSlot thisLocation, |
| Js::RegSlot evalLocation, |
| Js::RegSlot newTargetLocation, |
| ByteCodeGenerator *byteCodeGenerator, |
| FuncInfo *funcInfo, |
| size_t argIndex, |
| Js::ProfileId callSiteId) |
| { |
| BOOL fEvalInModule = false; |
| BOOL fIsPut = (rhsLocation != Js::Constants::NoRegister); |
| BOOL fIsEval = (evalLocation != Js::Constants::NoRegister); |
| BOOL fHasNewTarget = (newTargetLocation != Js::Constants::NoRegister); |
| |
| Js::ArgSlot argSlotIndex = (Js::ArgSlot) argIndex; |
| static const Js::ArgSlot maxExtraArgSlot = 4; // max(extraEvalArg, extraArg), where extraEvalArg==2 (moduleRoot,env), extraArg==4 (this, eval, evalInModule, newTarget) |
| |
| // check for integer overflow with margin for increments below to calculate argument count |
| if ((size_t)argSlotIndex != argIndex || argSlotIndex + maxExtraArgSlot < argSlotIndex) |
| { |
| Js::Throw::OutOfMemory(); |
| } |
| |
| Js::ArgSlot evalIndex; |
| |
| if (fIsPut) |
| { |
| // Emit the assigned value as an additional operand. Note that the value has already been evaluated. |
| // We just need to emit the ArgOut instruction. |
| argSlotIndex++; |
| byteCodeGenerator->Writer()->ArgOut<true>(argSlotIndex, rhsLocation, callSiteId); |
| } |
| |
| if (fIsEval && argSlotIndex > 0) |
| { |
| Assert(!fHasNewTarget); |
| |
| // Pass the frame display as an extra argument to "eval". |
| // Do this only if eval is called with some args |
| Js::RegSlot evalEnv; |
| if (funcInfo->IsGlobalFunction() && !(funcInfo->GetIsStrictMode() && byteCodeGenerator->GetFlags() & fscrEval)) |
| { |
| // Use current environment as the environment for the function being called when: |
| // - this is the root global function (not an eval's global function) |
| // - this is an eval's global function that is not in strict mode (see else block) |
| evalEnv = funcInfo->GetEnvRegister(); |
| } |
| else |
| { |
| // Use the frame display as the environment for the function being called when: |
| // - this is not a global function and thus it will have its own scope |
| // - this is an eval's global function that is in strict mode, since in strict mode the eval's global function |
| // has its own scope |
| evalEnv = funcInfo->frameDisplayRegister; |
| } |
| |
| evalEnv = byteCodeGenerator->PrependLocalScopes(evalEnv, evalLocation, funcInfo); |
| |
| Js::ModuleID moduleID = byteCodeGenerator->GetModuleID(); |
| if (moduleID != kmodGlobal) |
| { |
| // Pass both the module root and the environment. |
| fEvalInModule = true; |
| byteCodeGenerator->Writer()->ArgOut<true>(argSlotIndex + 1, ByteCodeGenerator::RootObjectRegister, callSiteId); |
| evalIndex = argSlotIndex + 2; |
| } |
| else |
| { |
| // Just pass the environment. |
| evalIndex = argSlotIndex + 1; |
| } |
| |
| if (evalEnv == funcInfo->GetEnvRegister() || evalEnv == funcInfo->frameDisplayRegister) |
| { |
| byteCodeGenerator->Writer()->ArgOutEnv(evalIndex); |
| } |
| else |
| { |
| byteCodeGenerator->Writer()->ArgOut<false>(evalIndex, evalEnv, callSiteId); |
| } |
| } |
| |
| if (fHasNewTarget) |
| { |
| Assert(!fIsEval); |
| |
| byteCodeGenerator->Writer()->ArgOut<true>(argSlotIndex + 1, newTargetLocation, callSiteId); |
| } |
| |
| Js::ArgSlot argIntCount = argSlotIndex + 1 + (Js::ArgSlot)fIsEval + (Js::ArgSlot)fEvalInModule + (Js::ArgSlot)fHasNewTarget; |
| |
| // eval and no args passed, return 1 as argument count |
| if (fIsEval && pnode == nullptr) |
| { |
| return 1; |
| } |
| |
| return argIntCount; |
| } |
| |
| Js::ArgSlot EmitArgList( |
| ParseNode *pnode, |
| Js::RegSlot rhsLocation, |
| Js::RegSlot thisLocation, |
| Js::RegSlot newTargetLocation, |
| BOOL fIsEval, |
| BOOL fAssignRegs, |
| ByteCodeGenerator *byteCodeGenerator, |
| FuncInfo *funcInfo, |
| Js::ProfileId callSiteId, |
| uint16 spreadArgCount = 0, |
| Js::AuxArray<uint32> **spreadIndices = nullptr) |
| { |
| // This function emits the arguments for a call. |
| // ArgOut's with uses immediately following defs. |
| |
| EmitArgListStart(thisLocation, byteCodeGenerator, funcInfo, callSiteId); |
| |
| Js::RegSlot evalLocation = Js::Constants::NoRegister; |
| |
| // |
| // If Emitting arguments for eval and assigning registers, get a tmpLocation for eval. |
| // This would be used while generating frameDisplay in EmitArgListEnd. |
| // |
| if (fIsEval) |
| { |
| evalLocation = funcInfo->AcquireTmpRegister(); |
| } |
| |
| if (spreadArgCount > 0) |
| { |
| const size_t extraAlloc = spreadArgCount * sizeof(uint32); |
| Assert(spreadIndices != nullptr); |
| *spreadIndices = AnewPlus(byteCodeGenerator->GetAllocator(), extraAlloc, Js::AuxArray<uint32>, spreadArgCount); |
| } |
| |
| size_t argIndex = EmitArgs(pnode, fAssignRegs, byteCodeGenerator, funcInfo, callSiteId, spreadIndices == nullptr ? nullptr : *spreadIndices); |
| |
| Js::ArgSlot argumentsCount = EmitArgListEnd(pnode, rhsLocation, thisLocation, evalLocation, newTargetLocation, byteCodeGenerator, funcInfo, argIndex, callSiteId); |
| |
| if (fIsEval) |
| { |
| funcInfo->ReleaseTmpRegister(evalLocation); |
| } |
| |
| return argumentsCount; |
| } |
| |
| void EmitConstantArgsToVarArray(ByteCodeGenerator *byteCodeGenerator, __out_ecount(argCount) Js::Var *vars, ParseNode *args, uint argCount) |
| { |
| uint index = 0; |
| while (args->nop == knopList && index < argCount) |
| { |
| if (args->sxBin.pnode1->nop == knopInt) |
| { |
| int value = args->sxBin.pnode1->sxInt.lw; |
| vars[index++] = Js::TaggedInt::ToVarUnchecked(value); |
| } |
| else if (args->sxBin.pnode1->nop == knopFlt) |
| { |
| Js::Var number = Js::JavascriptNumber::New(args->sxBin.pnode1->sxFlt.dbl, byteCodeGenerator->GetScriptContext()); |
| #if ! FLOATVAR |
| byteCodeGenerator->GetScriptContext()->BindReference(number); |
| #endif |
| vars[index++] = number; |
| } |
| else |
| { |
| AnalysisAssert(false); |
| } |
| args = args->sxBin.pnode2; |
| } |
| |
| if (index == argCount) |
| { |
| Assert(false); |
| Js::Throw::InternalError(); |
| return; |
| } |
| |
| if (args->nop == knopInt) |
| { |
| int value = args->sxInt.lw; |
| vars[index++] = Js::TaggedInt::ToVarUnchecked(value); |
| } |
| else if (args->nop == knopFlt) |
| { |
| Js::Var number = Js::JavascriptNumber::New(args->sxFlt.dbl, byteCodeGenerator->GetScriptContext()); |
| #if ! FLOATVAR |
| byteCodeGenerator->GetScriptContext()->BindReference(number); |
| #endif |
| vars[index++] = number; |
| } |
| else |
| { |
| AnalysisAssert(false); |
| } |
| } |
| |
| void EmitConstantArgsToIntArray(ByteCodeGenerator *byteCodeGenerator, __out_ecount(argCount) int32 *vars, ParseNode *args, uint argCount) |
| { |
| uint index = 0; |
| while (args->nop == knopList && index < argCount) |
| { |
| Assert(args->sxBin.pnode1->nop == knopInt); |
| vars[index++] = args->sxBin.pnode1->sxInt.lw; |
| args = args->sxBin.pnode2; |
| } |
| |
| if (index == argCount) |
| { |
| Assert(false); |
| Js::Throw::InternalError(); |
| return; |
| } |
| |
| Assert(args->nop == knopInt); |
| vars[index++] = args->sxInt.lw; |
| |
| Assert(index == argCount); |
| } |
| |
| void EmitConstantArgsToFltArray(ByteCodeGenerator *byteCodeGenerator, __out_ecount(argCount) double *vars, ParseNode *args, uint argCount) |
| { |
| uint index = 0; |
| while (args->nop == knopList && index < argCount) |
| { |
| OpCode nop = args->sxBin.pnode1->nop; |
| if (nop == knopInt) |
| { |
| vars[index++] = (double)args->sxBin.pnode1->sxInt.lw; |
| } |
| else |
| { |
| Assert(nop == knopFlt); |
| vars[index++] = args->sxBin.pnode1->sxFlt.dbl; |
| } |
| args = args->sxBin.pnode2; |
| } |
| |
| if (index == argCount) |
| { |
| Assert(false); |
| Js::Throw::InternalError(); |
| return; |
| } |
| |
| if (args->nop == knopInt) |
| { |
| vars[index++] = (double)args->sxInt.lw; |
| } |
| else |
| { |
| Assert(args->nop == knopFlt); |
| vars[index++] = args->sxFlt.dbl; |
| } |
| |
| Assert(index == argCount); |
| } |
| |
| // |
| // Called when we have new Ctr(constant, constant...) |
| // |
| Js::ArgSlot EmitNewObjectOfConstants( |
| ParseNode *pnode, |
| ByteCodeGenerator *byteCodeGenerator, |
| FuncInfo *funcInfo, |
| unsigned int argCount) |
| { |
| EmitArgListStart(Js::Constants::NoRegister, byteCodeGenerator, funcInfo, Js::Constants::NoProfileId); |
| |
| // Create the vars array |
| Js::VarArrayVarCount *vars = AnewPlus(byteCodeGenerator->GetAllocator(), (argCount - 1) * sizeof(Js::Var), Js::VarArrayVarCount, Js::TaggedInt::ToVarUnchecked(argCount - 1)); |
| |
| // Emit all constants to the vars array |
| EmitConstantArgsToVarArray(byteCodeGenerator, vars->elements, pnode->sxCall.pnodeArgs, argCount - 1); |
| |
| // Finish the arg list |
| Js::ArgSlot actualArgCount = EmitArgListEnd( |
| pnode->sxCall.pnodeArgs, |
| Js::Constants::NoRegister, |
| Js::Constants::NoRegister, |
| Js::Constants::NoRegister, |
| Js::Constants::NoRegister, |
| byteCodeGenerator, |
| funcInfo, |
| argCount - 1, |
| Js::Constants::NoProfileId); |
| |
| // Make sure the cacheId to regSlot map in the ByteCodeWriter is left in a consistent state after writing NewScObject_A |
| byteCodeGenerator->Writer()->RemoveEntryForRegSlotFromCacheIdMap(pnode->sxCall.pnodeTarget->location); |
| |
| // Generate the opcode with vars |
| byteCodeGenerator->Writer()->AuxiliaryContext( |
| Js::OpCode::NewScObject_A, |
| funcInfo->AcquireLoc(pnode), |
| vars, |
| sizeof(Js::VarArray) + (argCount - 1) * sizeof(Js::Var), |
| pnode->sxCall.pnodeTarget->location); |
| |
| AdeletePlus(byteCodeGenerator->GetAllocator(), (argCount - 1) * sizeof(Js::VarArrayVarCount), vars); |
| |
| return actualArgCount; |
| } |
| |
| void EmitMethodFld(bool isRoot, bool isScoped, Js::RegSlot location, Js::RegSlot callObjLocation, Js::PropertyId propertyId, ByteCodeGenerator *byteCodeGenerator, FuncInfo *funcInfo, bool registerCacheIdForCall = true) |
| { |
| Js::OpCode opcode; |
| if (!isRoot) |
| { |
| if (callObjLocation == funcInfo->frameObjRegister) |
| { |
| opcode = Js::OpCode::LdLocalMethodFld; |
| } |
| else |
| { |
| opcode = Js::OpCode::LdMethodFld; |
| } |
| } |
| else if (isScoped) |
| { |
| opcode = Js::OpCode::ScopedLdMethodFld; |
| } |
| else |
| { |
| opcode = Js::OpCode::LdRootMethodFld; |
| } |
| |
| if (isScoped || !isRoot) |
| { |
| Assert(isScoped || !isRoot || callObjLocation == ByteCodeGenerator::RootObjectRegister); |
| uint cacheId = funcInfo->FindOrAddInlineCacheId(callObjLocation, propertyId, true, false); |
| if (callObjLocation == funcInfo->frameObjRegister) |
| { |
| byteCodeGenerator->Writer()->ElementP(opcode, location, cacheId, false /*isCtor*/, registerCacheIdForCall); |
| } |
| else |
| { |
| byteCodeGenerator->Writer()->PatchableProperty(opcode, location, callObjLocation, cacheId, false /*isCtor*/, registerCacheIdForCall); |
| } |
| } |
| else |
| { |
| uint cacheId = funcInfo->FindOrAddRootObjectInlineCacheId(propertyId, true, false); |
| byteCodeGenerator->Writer()->PatchableRootProperty(opcode, location, cacheId, true, false, registerCacheIdForCall); |
| } |
| } |
| |
| void EmitMethodFld(ParseNode *pnode, Js::RegSlot callObjLocation, Js::PropertyId propertyId, ByteCodeGenerator *byteCodeGenerator, FuncInfo *funcInfo, bool registerCacheIdForCall = true) |
| { |
| // Load a call target of the form x.y(). (Call target may be a plain knopName if we're getting it from |
| // the global object, etc.) |
| bool isRoot = pnode->nop == knopName && (pnode->sxPid.sym == nullptr || pnode->sxPid.sym->GetIsGlobal()); |
| bool isScoped = (byteCodeGenerator->GetFlags() & fscrEval) != 0 || |
| (isRoot && callObjLocation != ByteCodeGenerator::RootObjectRegister); |
| |
| EmitMethodFld(isRoot, isScoped, pnode->location, callObjLocation, propertyId, byteCodeGenerator, funcInfo, registerCacheIdForCall); |
| } |
| |
| // lhs.apply(this, arguments); |
| void EmitApplyCall(ParseNode* pnode, Js::RegSlot rhsLocation, ByteCodeGenerator* byteCodeGenerator, FuncInfo* funcInfo, BOOL fReturnValue) |
| { |
| ParseNode* applyNode = pnode->sxCall.pnodeTarget; |
| ParseNode* thisNode = pnode->sxCall.pnodeArgs->sxBin.pnode1; |
| Assert(applyNode->nop == knopDot); |
| |
| ParseNode* funcNode = applyNode->sxBin.pnode1; |
| Js::ByteCodeLabel slowPath = byteCodeGenerator->Writer()->DefineLabel(); |
| Js::ByteCodeLabel afterSlowPath = byteCodeGenerator->Writer()->DefineLabel(); |
| Js::ByteCodeLabel argsAlreadyCreated = byteCodeGenerator->Writer()->DefineLabel(); |
| |
| Assert(applyNode->nop == knopDot); |
| |
| Emit(funcNode, byteCodeGenerator, funcInfo, false); |
| |
| funcInfo->AcquireLoc(applyNode); |
| Js::PropertyId propertyId = applyNode->sxBin.pnode2->sxPid.PropertyIdFromNameNode(); |
| |
| // As we won't be emitting a call instruction for apply, no need to register the cacheId for apply |
| // load to be associated with the call. This is also required, as in the absence of a corresponding |
| // call for apply, we won't remove the entry for "apply" cacheId from |
| // ByteCodeWriter::callRegToLdFldCacheIndexMap, which is contrary to our assumption that we would |
| // have removed an entry from a map upon seeing its corresponding call. |
| EmitMethodFld(applyNode, funcNode->location, propertyId, byteCodeGenerator, funcInfo, false /*registerCacheIdForCall*/); |
| |
| Symbol *argSym = funcInfo->GetArgumentsSymbol(); |
| Assert(argSym && argSym->GetIsArguments()); |
| Js::RegSlot argumentsLoc = argSym->GetLocation(); |
| |
| byteCodeGenerator->Writer()->Reg1(Js::OpCode::LdArgumentsFromFrame, argumentsLoc); |
| byteCodeGenerator->Writer()->BrReg1(Js::OpCode::BrNotNull_A, argsAlreadyCreated, argumentsLoc); |
| |
| // If apply is overridden, bail to slow path. |
| byteCodeGenerator->Writer()->BrReg1(Js::OpCode::BrFncNeqApply, slowPath, applyNode->location); |
| |
| // Note: acquire and release a temp register for this stack arg pointer instead of trying to stash it |
| // in funcInfo->stackArgReg. Otherwise, we'll needlessly load and store it in jitted loop bodies and |
| // may crash if we try to unbox it on the store. |
| Js::RegSlot stackArgReg = funcInfo->AcquireTmpRegister(); |
| byteCodeGenerator->Writer()->Reg1(Js::OpCode::LdStackArgPtr, stackArgReg); |
| |
| Js::RegSlot argCountLocation = funcInfo->AcquireTmpRegister(); |
| |
| byteCodeGenerator->Writer()->Reg1(Js::OpCode::LdArgCnt, argCountLocation); |
| byteCodeGenerator->Writer()->Reg5(Js::OpCode::ApplyArgs, funcNode->location, funcNode->location, thisNode->location, stackArgReg, argCountLocation); |
| |
| funcInfo->ReleaseTmpRegister(argCountLocation); |
| funcInfo->ReleaseTmpRegister(stackArgReg); |
| funcInfo->ReleaseLoc(applyNode); |
| funcInfo->ReleaseLoc(funcNode); |
| |
| // Clear these nodes as they are going to be used to re-generate the slow path. |
| VisitClearTmpRegs(applyNode, byteCodeGenerator, funcInfo); |
| VisitClearTmpRegs(funcNode, byteCodeGenerator, funcInfo); |
| |
| byteCodeGenerator->Writer()->Br(afterSlowPath); |
| |
| // slow path |
| byteCodeGenerator->Writer()->MarkLabel(slowPath); |
| if (funcInfo->frameObjRegister != Js::Constants::NoRegister) |
| { |
| byteCodeGenerator->EmitScopeObjectInit(funcInfo); |
| } |
| byteCodeGenerator->LoadHeapArguments(funcInfo); |
| |
| byteCodeGenerator->Writer()->MarkLabel(argsAlreadyCreated); |
| EmitCall(pnode, rhsLocation, byteCodeGenerator, funcInfo, fReturnValue, /*fEvaluateComponents*/true, /*fHasNewTarget*/false); |
| byteCodeGenerator->Writer()->MarkLabel(afterSlowPath); |
| } |
| |
| void EmitMethodElem(ParseNode *pnode, Js::RegSlot callObjLocation, Js::RegSlot indexLocation, ByteCodeGenerator *byteCodeGenerator) |
| { |
| // Load a call target of the form x[y](). |
| byteCodeGenerator->Writer()->Element(Js::OpCode::LdMethodElem, pnode->location, callObjLocation, indexLocation); |
| } |
| |
| void EmitCallTargetNoEvalComponents( |
| ParseNode *pnodeTarget, |
| BOOL fSideEffectArgs, |
| Js::RegSlot *thisLocation, |
| Js::RegSlot *callObjLocation, |
| ByteCodeGenerator *byteCodeGenerator, |
| FuncInfo *funcInfo) |
| { |
| // We first get a reference to the call target, then evaluate the arguments, then |
| // evaluate the call target. |
| |
| // - emit reference to target |
| // - copy instance to scratch reg if necessary. |
| // - assign this |
| // - assign instance for dynamic/global name |
| // - emit args |
| // - do call (CallFld/Elem/I) |
| |
| switch (pnodeTarget->nop) |
| { |
| case knopDot: |
| *thisLocation = pnodeTarget->sxBin.pnode1->location; |
| *callObjLocation = pnodeTarget->sxBin.pnode1->location; |
| break; |
| |
| case knopIndex: |
| *thisLocation = pnodeTarget->sxBin.pnode1->location; |
| *callObjLocation = pnodeTarget->sxBin.pnode1->location; |
| break; |
| |
| case knopName: |
| // If the call target is a name, do some extra work to get its instance and the "this" pointer. |
| byteCodeGenerator->EmitLoadInstance(pnodeTarget->sxPid.sym, pnodeTarget->sxPid.pid, thisLocation, callObjLocation, funcInfo); |
| if (*thisLocation == Js::Constants::NoRegister) |
| { |
| *thisLocation = funcInfo->undefinedConstantRegister; |
| } |
| |
| break; |
| |
| default: |
| *thisLocation = funcInfo->undefinedConstantRegister; |
| break; |
| } |
| } |
| |
| void EmitSuperMethodBegin( |
| ParseNode *pnodeTarget, |
| ByteCodeGenerator *byteCodeGenerator, |
| FuncInfo *funcInfo) |
| { |
| FuncInfo *parentFuncInfo = funcInfo; |
| if (parentFuncInfo->IsLambda()) |
| { |
| parentFuncInfo = byteCodeGenerator->FindEnclosingNonLambda(); |
| } |
| |
| if (pnodeTarget->sxBin.pnode1->nop == knopSuper && parentFuncInfo->IsClassConstructor() && !parentFuncInfo->IsBaseClassConstructor()) |
| { |
| byteCodeGenerator->EmitScopeSlotLoadThis(funcInfo, funcInfo->thisPointerRegister, /*chkUndecl*/ true); |
| } |
| } |
| |
| void EmitCallTarget( |
| ParseNode *pnodeTarget, |
| BOOL fSideEffectArgs, |
| Js::RegSlot *thisLocation, |
| Js::RegSlot *callObjLocation, |
| ByteCodeGenerator *byteCodeGenerator, |
| FuncInfo *funcInfo) |
| { |
| // - emit target |
| // - assign this |
| // - emit args |
| // - do call |
| |
| // The call target is fully evaluated before the argument list. Note that we're not handling |
| // put-call cases here currently, as such cases only apply to host objects |
| // and are very unlikely to behave differently depending on the order of evaluation. |
| |
| switch (pnodeTarget->nop) |
| { |
| case knopDot: |
| { |
| funcInfo->AcquireLoc(pnodeTarget); |
| // Assign the call target operand(s), putting them into expression temps if necessary to protect |
| // them from side-effects. |
| if (fSideEffectArgs) |
| { |
| // Though we're done with target evaluation after this point, still protect opnd1 from |
| // arg side-effects as it's the "this" pointer. |
| SaveOpndValue(pnodeTarget->sxBin.pnode1, funcInfo); |
| } |
| |
| if ((pnodeTarget->sxBin.pnode2->nop == knopName) && ((pnodeTarget->sxBin.pnode2->sxPid.PropertyIdFromNameNode() == Js::PropertyIds::apply) || (pnodeTarget->sxBin.pnode2->sxPid.PropertyIdFromNameNode() == Js::PropertyIds::call))) |
| { |
| pnodeTarget->sxBin.pnode1->SetIsCallApplyTargetLoad(); |
| } |
| |
| Emit(pnodeTarget->sxBin.pnode1, byteCodeGenerator, funcInfo, false); |
| Js::PropertyId propertyId = pnodeTarget->sxBin.pnode2->sxPid.PropertyIdFromNameNode(); |
| Js::RegSlot callObjLocation = pnodeTarget->sxBin.pnode1->location; |
| Js::RegSlot protoLocation = callObjLocation; |
| EmitSuperMethodBegin(pnodeTarget, byteCodeGenerator, funcInfo); |
| EmitMethodFld(pnodeTarget, protoLocation, propertyId, byteCodeGenerator, funcInfo); |
| |
| // Function calls on the 'super' object should maintain current 'this' pointer |
| *thisLocation = (pnodeTarget->sxBin.pnode1->nop == knopSuper) ? funcInfo->thisPointerRegister : pnodeTarget->sxBin.pnode1->location; |
| break; |
| } |
| |
| case knopIndex: |
| { |
| funcInfo->AcquireLoc(pnodeTarget); |
| // Assign the call target operand(s), putting them into expression temps if necessary to protect |
| // them from side-effects. |
| if (fSideEffectArgs || !(ParseNode::Grfnop(pnodeTarget->sxBin.pnode2->nop) & fnopLeaf)) |
| { |
| // Though we're done with target evaluation after this point, still protect opnd1 from |
| // arg or opnd2 side-effects as it's the "this" pointer. |
| SaveOpndValue(pnodeTarget->sxBin.pnode1, funcInfo); |
| } |
| Emit(pnodeTarget->sxBin.pnode1, byteCodeGenerator, funcInfo, false); |
| Emit(pnodeTarget->sxBin.pnode2, byteCodeGenerator, funcInfo, false); |
| |
| Js::RegSlot indexLocation = pnodeTarget->sxBin.pnode2->location; |
| Js::RegSlot callObjLocation = pnodeTarget->sxBin.pnode1->location; |
| Js::RegSlot protoLocation = callObjLocation; |
| EmitSuperMethodBegin(pnodeTarget, byteCodeGenerator, funcInfo); |
| EmitMethodElem(pnodeTarget, protoLocation, indexLocation, byteCodeGenerator); |
| |
| funcInfo->ReleaseLoc(pnodeTarget->sxBin.pnode2); // don't release indexLocation until after we use it. |
| |
| // Function calls on the 'super' object should maintain current 'this' pointer |
| *thisLocation = (pnodeTarget->sxBin.pnode1->nop == knopSuper) ? funcInfo->thisPointerRegister : pnodeTarget->sxBin.pnode1->location; |
| break; |
| } |
| |
| case knopClassDecl: |
| { |
| Emit(pnodeTarget, byteCodeGenerator, funcInfo, false); |
| // We won't always have an assigned this register (e.g. class expression calls.) We need undefined in this case. |
| *thisLocation = funcInfo->thisPointerRegister == Js::Constants::NoRegister ? funcInfo->undefinedConstantRegister : funcInfo->thisPointerRegister; |
| break; |
| } |
| |
| case knopSuper: |
| { |
| Emit(pnodeTarget, byteCodeGenerator, funcInfo, false, /*isConstructorCall*/ true); // reuse isConstructorCall ("new super()" is illegal) |
| |
| // Super calls should always use the new.target register unless we don't have one. |
| // That could happen if we have an eval('super()') outside of a class constructor. |
| if (funcInfo->newTargetRegister != Js::Constants::NoRegister) |
| { |
| *thisLocation = funcInfo->newTargetRegister; |
| } |
| else |
| { |
| *thisLocation = funcInfo->thisPointerRegister; |
| } |
| break; |
| } |
| |
| case knopName: |
| { |
| funcInfo->AcquireLoc(pnodeTarget); |
| // Assign the call target operand(s), putting them into expression temps if necessary to protect |
| // them from side-effects. |
| if (fSideEffectArgs) |
| { |
| SaveOpndValue(pnodeTarget, funcInfo); |
| } |
| byteCodeGenerator->EmitLoadInstance(pnodeTarget->sxPid.sym, pnodeTarget->sxPid.pid, thisLocation, callObjLocation, funcInfo); |
| if (*callObjLocation != Js::Constants::NoRegister) |
| { |
| // Load the call target as a property of the instance. |
| Js::PropertyId propertyId = pnodeTarget->sxPid.PropertyIdFromNameNode(); |
| EmitMethodFld(pnodeTarget, *callObjLocation, propertyId, byteCodeGenerator, funcInfo); |
| break; |
| } |
| |
| // FALL THROUGH to evaluate call target. |
| } |
| |
| default: |
| // Assign the call target operand(s), putting them into expression temps if necessary to protect |
| // them from side-effects. |
| Emit(pnodeTarget, byteCodeGenerator, funcInfo, false); |
| *thisLocation = funcInfo->undefinedConstantRegister; |
| break; |
| } |
| |
| // "This" pointer should have been assigned by the above. |
| Assert(*thisLocation != Js::Constants::NoRegister); |
| } |
| |
| void EmitCallI( |
| ParseNode *pnode, |
| BOOL fEvaluateComponents, |
| BOOL fIsPut, |
| BOOL fIsEval, |
| BOOL fHasNewTarget, |
| uint32 actualArgCount, |
| ByteCodeGenerator *byteCodeGenerator, |
| FuncInfo *funcInfo, |
| Js::ProfileId callSiteId, |
| Js::AuxArray<uint32> *spreadIndices = nullptr) |
| { |
| // Emit a call where the target is in a register, because it's either a local name or an expression we've |
| // already evaluated. |
| |
| ParseNode *pnodeTarget = pnode->sxBin.pnode1; |
| Js::OpCode op; |
| Js::CallFlags callFlags = Js::CallFlags::CallFlags_None; |
| uint spreadExtraAlloc = 0; |
| |
| Js::ArgSlot actualArgSlotCount = (Js::ArgSlot) actualArgCount; |
| |
| // check for integer overflow |
| if ((size_t)actualArgSlotCount != actualArgCount) |
| { |
| Js::Throw::OutOfMemory(); |
| } |
| |
| if (fIsPut) |
| { |
| if (pnode->sxCall.spreadArgCount > 0) |
| { |
| // TODO(tcare): We are disallowing spread with CallIPut for the moment. See DEVDIV2: 876387 |
| // When CallIPut is migrated to the CallIExtended layout, this can be removed. |
| byteCodeGenerator->Writer()->W1(Js::OpCode::RuntimeReferenceError, SCODE_CODE(JSERR_CantAsgCall)); |
| } |
| // Grab a tmp register for the call result. |
| Js::RegSlot tmpReg = funcInfo->AcquireTmpRegister(); |
| byteCodeGenerator->Writer()->CallI(Js::OpCode::CallIFlags, tmpReg, pnodeTarget->location, actualArgSlotCount, callSiteId, Js::CallFlags::CallFlags_NewTarget); |
| funcInfo->ReleaseTmpRegister(tmpReg); |
| } |
| else |
| { |
| if (fEvaluateComponents) |
| { |
| // Release the call target operands we assigned above. If we didn't assign them here, |
| // we'll need them later, so we can't re-use them for the result of the call. |
| funcInfo->ReleaseLoc(pnodeTarget); |
| } |
| // Grab a register for the call result. |
| if (pnode->isUsed) |
| { |
| funcInfo->AcquireLoc(pnode); |
| } |
| |
| if (fIsEval) |
| { |
| op = Js::OpCode::CallIExtendedFlags; |
| callFlags = Js::CallFlags::CallFlags_ExtraArg; |
| } |
| else |
| { |
| bool isSuperCall = pnodeTarget->nop == knopSuper; |
| |
| if (isSuperCall) |
| { |
| callFlags = Js::CallFlags_New; |
| } |
| if (fHasNewTarget) |
| { |
| callFlags = (Js::CallFlags) (callFlags | Js::CallFlags::CallFlags_ExtraArg | Js::CallFlags::CallFlags_NewTarget); |
| } |
| |
| if (pnode->sxCall.spreadArgCount > 0) |
| { |
| op = (isSuperCall || fHasNewTarget) ? Js::OpCode::CallIExtendedFlags : Js::OpCode::CallIExtended; |
| } |
| else |
| { |
| op = (isSuperCall || fHasNewTarget) ? Js::OpCode::CallIFlags : Js::OpCode::CallI; |
| } |
| } |
| |
| if (op == Js::OpCode::CallI || op == Js::OpCode::CallIFlags) |
| { |
| byteCodeGenerator->Writer()->CallI(op, pnode->location, pnodeTarget->location, actualArgSlotCount, callSiteId, callFlags); |
| } |
| else |
| { |
| uint spreadIndicesSize = 0; |
| Js::CallIExtendedOptions options = Js::CallIExtended_None; |
| |
| if (pnode->sxCall.spreadArgCount > 0) |
| { |
| Assert(spreadIndices != nullptr); |
| spreadExtraAlloc = spreadIndices->count * sizeof(uint32); |
| spreadIndicesSize = sizeof(*spreadIndices) + spreadExtraAlloc; |
| options = Js::CallIExtended_SpreadArgs; |
| } |
| |
| byteCodeGenerator->Writer()->CallIExtended(op, pnode->location, pnodeTarget->location, actualArgSlotCount, options, spreadIndices, spreadIndicesSize, callSiteId, callFlags); |
| } |
| |
| if (pnode->sxCall.spreadArgCount > 0) |
| { |
| Assert(spreadExtraAlloc != 0); |
| AdeletePlus(byteCodeGenerator->GetAllocator(), spreadExtraAlloc, spreadIndices); |
| } |
| } |
| } |
| |
| void EmitCallInstrNoEvalComponents( |
| ParseNode *pnode, |
| BOOL fIsPut, |
| BOOL fIsEval, |
| Js::RegSlot thisLocation, |
| Js::RegSlot callObjLocation, |
| uint32 actualArgCount, |
| ByteCodeGenerator *byteCodeGenerator, |
| FuncInfo *funcInfo, |
| Js::ProfileId callSiteId, |
| Js::AuxArray<uint32> *spreadIndices = nullptr) |
| { |
| // Emit the call instruction. The call target is a reference at this point, and we evaluate |
| // it as part of doing the actual call. |
| // Note that we don't handle the (fEvaluateComponents == TRUE) case in this function. |
| // (This function is only called on the !fEvaluateComponents branch in EmitCall.) |
| |
| ParseNode *pnodeTarget = pnode->sxBin.pnode1; |
| |
| switch (pnodeTarget->nop) |
| { |
| case knopDot: |
| { |
| Assert(pnodeTarget->sxBin.pnode2->nop == knopName); |
| Js::PropertyId propertyId = pnodeTarget->sxBin.pnode2->sxPid.PropertyIdFromNameNode(); |
| |
| EmitMethodFld(pnodeTarget, callObjLocation, propertyId, byteCodeGenerator, funcInfo); |
| EmitCallI(pnode, /*fEvaluateComponents*/ FALSE, fIsPut, fIsEval, /*fHasNewTarget*/ FALSE, actualArgCount, byteCodeGenerator, funcInfo, callSiteId, spreadIndices); |
| } |
| break; |
| |
| case knopIndex: |
| { |
| EmitMethodElem(pnodeTarget, pnodeTarget->sxBin.pnode1->location, pnodeTarget->sxBin.pnode2->location, byteCodeGenerator); |
| EmitCallI(pnode, /*fEvaluateComponents*/ FALSE, fIsPut, fIsEval, /*fHasNewTarget*/ FALSE, actualArgCount, byteCodeGenerator, funcInfo, callSiteId, spreadIndices); |
| } |
| break; |
| |
| case knopName: |
| { |
| if (callObjLocation != Js::Constants::NoRegister) |
| { |
| // We still have to get the property from its instance, so emit CallFld. |
| if (thisLocation != callObjLocation) |
| { |
| funcInfo->ReleaseTmpRegister(thisLocation); |
| } |
| funcInfo->ReleaseTmpRegister(callObjLocation); |
| |
| Js::PropertyId propertyId = pnodeTarget->sxPid.PropertyIdFromNameNode(); |
| EmitMethodFld(pnodeTarget, callObjLocation, propertyId, byteCodeGenerator, funcInfo); |
| EmitCallI(pnode, /*fEvaluateComponents*/ FALSE, fIsPut, fIsEval, /*fHasNewTarget*/ FALSE, actualArgCount, byteCodeGenerator, funcInfo, callSiteId, spreadIndices); |
| break; |
| } |
| } |
| // FALL THROUGH |
| |
| default: |
| EmitCallI(pnode, /*fEvaluateComponents*/ FALSE, fIsPut, fIsEval, /*fHasNewTarget*/ FALSE, actualArgCount, byteCodeGenerator, funcInfo, callSiteId, spreadIndices); |
| break; |
| } |
| } |
| |
| void EmitCallInstr( |
| ParseNode *pnode, |
| BOOL fIsPut, |
| BOOL fIsEval, |
| BOOL fHasNewTarget, |
| Js::RegSlot thisLocation, |
| Js::RegSlot callObjLocation, |
| uint32 actualArgCount, |
| ByteCodeGenerator *byteCodeGenerator, |
| FuncInfo *funcInfo, |
| Js::ProfileId callSiteId, |
| Js::AuxArray<uint32> *spreadIndices = nullptr) |
| { |
| // Emit a call instruction. The call target has been fully evaluated already, so we always |
| // emit a CallI through the register that holds the target value. |
| // Note that we don't handle !fEvaluateComponents cases at this point. |
| // (This function is only called on the fEvaluateComponents branch in EmitCall.) |
| |
| if (thisLocation != Js::Constants::NoRegister) |
| { |
| funcInfo->ReleaseTmpRegister(thisLocation); |
| } |
| |
| if (callObjLocation != Js::Constants::NoRegister && |
| callObjLocation != thisLocation) |
| { |
| funcInfo->ReleaseTmpRegister(callObjLocation); |
| } |
| |
| EmitCallI(pnode, /*fEvaluateComponents*/ TRUE, fIsPut, fIsEval, fHasNewTarget, actualArgCount, byteCodeGenerator, funcInfo, callSiteId, spreadIndices); |
| } |
| |
| void EmitCall( |
| ParseNode* pnode, |
| Js::RegSlot rhsLocation, |
| ByteCodeGenerator* byteCodeGenerator, |
| FuncInfo* funcInfo, |
| BOOL fReturnValue, |
| BOOL fEvaluateComponents, |
| BOOL fHasNewTarget, |
| Js::RegSlot overrideThisLocation) |
| { |
| BOOL fIsPut = (rhsLocation != Js::Constants::NoRegister); |
| // If the call returns a float, we'll note this in the byte code. |
| Js::RegSlot thisLocation = Js::Constants::NoRegister; |
| Js::RegSlot callObjLocation = Js::Constants::NoRegister; |
| Js::RegSlot newTargetLocation = Js::Constants::NoRegister; |
| BOOL fSideEffectArgs = FALSE; |
| ParseNode *pnodeTarget = pnode->sxCall.pnodeTarget; |
| ParseNode *pnodeArgs = pnode->sxCall.pnodeArgs; |
| uint16 spreadArgCount = pnode->sxCall.spreadArgCount; |
| |
| unsigned int argCount = CountArguments(pnode->sxCall.pnodeArgs, &fSideEffectArgs) + (unsigned int)fIsPut; |
| |
| BOOL fIsEval = !fIsPut && pnode->sxCall.isEvalCall; |
| |
| if (fIsEval) |
| { |
| Assert(!fHasNewTarget); |
| |
| // |
| // "eval" takes the closure environment as an extra argument |
| // Pass the closure env only if some argument is passed |
| // For just eval(), don't pass the closure environment |
| // |
| if (argCount > 1) |
| { |
| // Check the module ID as well. If it's not the global (default) module, |
| // we need to pass the root to eval so it can do the right global lookups. |
| // (Passing the module root is the least disruptive way to get the module ID |
| // to the helper, given the current set of byte codes. Once we have a full set |
| // of byte code ops taking immediate opnds, passing the ID is more intuitive.) |
| Js::ModuleID moduleID = byteCodeGenerator->GetModuleID(); |
| if (moduleID == kmodGlobal) |
| { |
| argCount++; |
| } |
| else |
| { |
| // Module ID must be passed |
| argCount += 2; |
| } |
| } |
| } |
| |
| if (fHasNewTarget) |
| { |
| Assert(!fIsEval); |
| |
| // When we need to pass new.target explicitly, it is passed as an extra argument. |
| // This is similar to how eval passes an extra argument for the frame display and is |
| // used to support cases where we need to pass both 'this' and new.target as part of |
| // a function call. |
| // OpCode::LdNewTarget knows how to look at the call flags and fetch this argument. |
| argCount++; |
| newTargetLocation = funcInfo->newTargetRegister; |
| |
| Assert(newTargetLocation != Js::Constants::NoRegister); |
| } |
| |
| Js::ArgSlot argSlotCount = (Js::ArgSlot)argCount; |
| |
| if (argCount != (unsigned int)argSlotCount) |
| { |
| Js::Throw::OutOfMemory(); |
| } |
| |
| if (fReturnValue) |
| { |
| pnode->isUsed = true; |
| } |
| |
| // |
| // Set up the call. |
| // |
| |
| if (!fEvaluateComponents) |
| { |
| EmitCallTargetNoEvalComponents(pnodeTarget, fSideEffectArgs, &thisLocation, &callObjLocation, byteCodeGenerator, funcInfo); |
| } |
| else |
| { |
| EmitCallTarget(pnodeTarget, fSideEffectArgs, &thisLocation, &callObjLocation, byteCodeGenerator, funcInfo); |
| } |
| |
| bool releaseThisLocation = true; |
| // If we are strictly overriding the this location, ignore what the call target set this location to. |
| if (overrideThisLocation != Js::Constants::NoRegister) |
| { |
| thisLocation = overrideThisLocation; |
| releaseThisLocation = false; |
| } |
| |
| // Evaluate the arguments (nothing mode-specific here). |
| // Start call, allocate out param space |
| funcInfo->StartRecordingOutArgs(argSlotCount); |
| |
| Js::ProfileId callSiteId = byteCodeGenerator->GetNextCallSiteId(Js::OpCode::CallI); |
| |
| byteCodeGenerator->Writer()->StartCall(Js::OpCode::StartCall, argSlotCount); |
| Js::AuxArray<uint32> *spreadIndices; |
| Js::ArgSlot actualArgCount = EmitArgList(pnodeArgs, rhsLocation, thisLocation, newTargetLocation, fIsEval, fEvaluateComponents, byteCodeGenerator, funcInfo, callSiteId, spreadArgCount, &spreadIndices); |
| Assert(argSlotCount == actualArgCount); |
| |
| if (!fEvaluateComponents) |
| { |
| EmitCallInstrNoEvalComponents(pnode, fIsPut, fIsEval, thisLocation, callObjLocation, actualArgCount, byteCodeGenerator, funcInfo, callSiteId, spreadIndices); |
| } |
| else |
| { |
| EmitCallInstr(pnode, fIsPut, fIsEval, fHasNewTarget, releaseThisLocation ? thisLocation : Js::Constants::NoRegister, callObjLocation, actualArgCount, byteCodeGenerator, funcInfo, callSiteId, spreadIndices); |
| } |
| |
| // End call, pop param space |
| funcInfo->EndRecordingOutArgs(argSlotCount); |
| } |
| |
| void EmitInvoke( |
| Js::RegSlot location, |
| Js::RegSlot callObjLocation, |
| Js::PropertyId propertyId, |
| ByteCodeGenerator* byteCodeGenerator, |
| FuncInfo* funcInfo) |
| { |
| EmitMethodFld(false, false, location, callObjLocation, propertyId, byteCodeGenerator, funcInfo); |
| |
| funcInfo->StartRecordingOutArgs(1); |
| |
| Js::ProfileId callSiteId = byteCodeGenerator->GetNextCallSiteId(Js::OpCode::CallI); |
| |
| byteCodeGenerator->Writer()->StartCall(Js::OpCode::StartCall, 1); |
| EmitArgListStart(callObjLocation, byteCodeGenerator, funcInfo, callSiteId); |
| |
| byteCodeGenerator->Writer()->CallI(Js::OpCode::CallI, location, location, 1, callSiteId); |
| } |
| |
| void EmitInvoke( |
| Js::RegSlot location, |
| Js::RegSlot callObjLocation, |
| Js::PropertyId propertyId, |
| ByteCodeGenerator* byteCodeGenerator, |
| FuncInfo* funcInfo, |
| Js::RegSlot arg1Location) |
| { |
| EmitMethodFld(false, false, location, callObjLocation, propertyId, byteCodeGenerator, funcInfo); |
| |
| funcInfo->StartRecordingOutArgs(2); |
| |
| Js::ProfileId callSiteId = byteCodeGenerator->GetNextCallSiteId(Js::OpCode::CallI); |
| |
| byteCodeGenerator->Writer()->StartCall(Js::OpCode::StartCall, 2); |
| EmitArgListStart(callObjLocation, byteCodeGenerator, funcInfo, callSiteId); |
| byteCodeGenerator->Writer()->ArgOut<true>(1, arg1Location, callSiteId); |
| |
| byteCodeGenerator->Writer()->CallI(Js::OpCode::CallI, location, location, 2, callSiteId); |
| } |
| |
| void EmitComputedFunctionNameVar(ParseNode *nameNode, ParseNode *exprNode, ByteCodeGenerator *byteCodeGenerator) |
| { |
| AssertMsg(exprNode != nullptr, "callers of this function should pass in a valid expression Node"); |
| |
| if (nameNode == nullptr) |
| { |
| return; |
| } |
| |
| if ((exprNode->nop == knopFncDecl && (exprNode->sxFnc.pnodeName == nullptr || exprNode->sxFnc.pnodeName->nop != knopVarDecl))) |
| { |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::SetComputedNameVar, exprNode->location, nameNode->location); |
| } |
| } |
| |
| void EmitMemberNode(ParseNode *memberNode, Js::RegSlot objectLocation, ByteCodeGenerator *byteCodeGenerator, FuncInfo *funcInfo, ParseNode* parentNode, bool useStore, bool* isObjectEmpty = nullptr) |
| { |
| ParseNode *nameNode = memberNode->sxBin.pnode1; |
| ParseNode *exprNode = memberNode->sxBin.pnode2; |
| |
| bool isFncDecl = exprNode->nop == knopFncDecl; |
| bool isClassMember = isFncDecl && exprNode->sxFnc.IsClassMember(); |
| |
| // Moved SetComputedNameVar before LdFld of prototype because loading the prototype undefers the function TypeHandler |
| // which makes this bytecode too late to influence the function.name. |
| if (nameNode->nop == knopComputedName) |
| { |
| // Computed property name |
| // Transparently pass the name expr |
| // The Emit will replace this with a temp register if necessary to preserve the value. |
| nameNode->location = nameNode->sxUni.pnode1->location; |
| EmitBinaryOpnds(nameNode, exprNode, byteCodeGenerator, funcInfo); |
| if (isFncDecl && !exprNode->sxFnc.IsClassConstructor()) |
| { |
| EmitComputedFunctionNameVar(nameNode, exprNode, byteCodeGenerator); |
| } |
| } |
| |
| // Classes allocates a RegSlot as part of Instance Methods EmitClassInitializers, |
| // but if we don't have any members then we don't need to load the prototype. |
| Assert(isClassMember == (isObjectEmpty != nullptr)); |
| if (isClassMember && *isObjectEmpty) |
| { |
| *isObjectEmpty = false; |
| int cacheId = funcInfo->FindOrAddInlineCacheId(parentNode->location, Js::PropertyIds::prototype, false, false); |
| byteCodeGenerator->Writer()->PatchableProperty(Js::OpCode::LdFld, objectLocation, parentNode->location, cacheId); |
| } |
| |
| if (nameNode->nop == knopComputedName) |
| { |
| Assert(memberNode->nop == knopGetMember || memberNode->nop == knopSetMember || memberNode->nop == knopMember); |
| |
| Js::OpCode setOp = memberNode->nop == knopGetMember ? |
| (isClassMember ? Js::OpCode::InitClassMemberGetComputedName : Js::OpCode::InitGetElemI) : |
| memberNode->nop == knopSetMember ? |
| (isClassMember ? Js::OpCode::InitClassMemberSetComputedName : Js::OpCode::InitSetElemI) : |
| (isClassMember ? Js::OpCode::InitClassMemberComputedName : Js::OpCode::InitComputedProperty); |
| |
| byteCodeGenerator->Writer()->Element(setOp, exprNode->location, objectLocation, nameNode->location, true); |
| |
| // Class and object members need a reference back to the class. |
| if (isFncDecl) |
| { |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::SetHomeObj, exprNode->location, objectLocation); |
| } |
| |
| funcInfo->ReleaseLoc(exprNode); |
| funcInfo->ReleaseLoc(nameNode); |
| |
| return; |
| } |
| |
| Js::OpCode stFldOpCode = (Js::OpCode)0; |
| if (useStore) |
| { |
| stFldOpCode = ByteCodeGenerator::GetStFldOpCode(funcInfo, false, false, false, isClassMember); |
| } |
| |
| Emit(exprNode, byteCodeGenerator, funcInfo, false); |
| Js::PropertyId propertyId = nameNode->sxPid.PropertyIdFromNameNode(); |
| |
| if (Js::PropertyIds::name == propertyId |
| && exprNode->nop == knopFncDecl |
| && exprNode->sxFnc.IsStaticMember() |
| && parentNode != nullptr && parentNode->nop == knopClassDecl |
| && parentNode->sxClass.pnodeConstructor != nullptr) |
| { |
| Js::ParseableFunctionInfo* nameFunc = parentNode->sxClass.pnodeConstructor->sxFnc.funcInfo->byteCodeFunction->GetParseableFunctionInfo(); |
| nameFunc->SetIsStaticNameFunction(true); |
| } |
| |
| if (memberNode->nop == knopMember || memberNode->nop == knopMemberShort) |
| { |
| // The internal prototype should be set only if the production is of the form PropertyDefinition : PropertyName : AssignmentExpression |
| if (propertyId == Js::PropertyIds::__proto__ && memberNode->nop != knopMemberShort && (exprNode->nop != knopFncDecl || !exprNode->sxFnc.IsMethod())) |
| { |
| byteCodeGenerator->Writer()->Property(Js::OpCode::InitProto, exprNode->location, objectLocation, |
| funcInfo->FindOrAddReferencedPropertyId(propertyId)); |
| } |
| else |
| { |
| uint cacheId = funcInfo->FindOrAddInlineCacheId(objectLocation, propertyId, false, true); |
| Js::OpCode patchablePropertyOpCode; |
| |
| if (useStore) |
| { |
| patchablePropertyOpCode = stFldOpCode; |
| } |
| else if (isClassMember) |
| { |
| patchablePropertyOpCode = Js::OpCode::InitClassMember; |
| } |
| else |
| { |
| patchablePropertyOpCode = Js::OpCode::InitFld; |
| } |
| |
| byteCodeGenerator->Writer()->PatchableProperty(patchablePropertyOpCode, exprNode->location, objectLocation, cacheId); |
| } |
| } |
| else |
| { |
| Assert(memberNode->nop == knopGetMember || memberNode->nop == knopSetMember); |
| |
| Js::OpCode setOp = memberNode->nop == knopGetMember ? |
| (isClassMember ? Js::OpCode::InitClassMemberGet : Js::OpCode::InitGetFld) : |
| (isClassMember ? Js::OpCode::InitClassMemberSet : Js::OpCode::InitSetFld); |
| |
| byteCodeGenerator->Writer()->Property(setOp, exprNode->location, objectLocation, funcInfo->FindOrAddReferencedPropertyId(propertyId)); |
| } |
| |
| // Class and object members need a reference back to the class. |
| if (isFncDecl) |
| { |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::SetHomeObj, exprNode->location, objectLocation); |
| } |
| |
| funcInfo->ReleaseLoc(exprNode); |
| |
| if (propertyId == Js::PropertyIds::valueOf) |
| { |
| byteCodeGenerator->GetScriptContext()->optimizationOverrides.SetSideEffects(Js::SideEffects_ValueOf); |
| } |
| else if (propertyId == Js::PropertyIds::toString) |
| { |
| byteCodeGenerator->GetScriptContext()->optimizationOverrides.SetSideEffects(Js::SideEffects_ToString); |
| } |
| } |
| |
| void EmitClassInitializers(ParseNode *memberList, Js::RegSlot objectLocation, ByteCodeGenerator *byteCodeGenerator, FuncInfo *funcInfo, ParseNode* parentNode, bool isObjectEmpty) |
| { |
| if (memberList != nullptr) |
| { |
| while (memberList->nop == knopList) |
| { |
| ParseNode *memberNode = memberList->sxBin.pnode1; |
| EmitMemberNode(memberNode, objectLocation, byteCodeGenerator, funcInfo, parentNode, /*useStore*/ false, &isObjectEmpty); |
| memberList = memberList->sxBin.pnode2; |
| } |
| EmitMemberNode(memberList, objectLocation, byteCodeGenerator, funcInfo, parentNode, /*useStore*/ false, &isObjectEmpty); |
| } |
| } |
| |
| void EmitObjectInitializers(ParseNode *memberList, Js::RegSlot objectLocation, ByteCodeGenerator *byteCodeGenerator, FuncInfo *funcInfo) |
| { |
| ParseNode *pmemberList = memberList; |
| unsigned int argCount = 0; |
| uint32 value; |
| Js::PropertyId propertyId; |
| |
| // |
| // 1. Add all non-int property ids to a dictionary propertyIds with value true |
| // 2. Get the count of propertyIds |
| // 3. Create a propertyId array of size count |
| // 4. Put the propIds in the auxiliary area |
| // 5. Get the objectLiteralCacheId |
| // 6. Generate propId inits with values |
| // |
| |
| // Handle propertyId collision |
| typedef JsUtil::BaseHashSet<Js::PropertyId, ArenaAllocator, PowerOf2SizePolicy> PropertyIdSet; |
| PropertyIdSet* propertyIds = Anew(byteCodeGenerator->GetAllocator(), PropertyIdSet, byteCodeGenerator->GetAllocator(), 17); |
| |
| bool hasComputedName = false; |
| if (memberList != nullptr) |
| { |
| while (memberList->nop == knopList) |
| { |
| if (memberList->sxBin.pnode1->sxBin.pnode1->nop == knopComputedName) |
| { |
| hasComputedName = true; |
| break; |
| } |
| |
| propertyId = memberList->sxBin.pnode1->sxBin.pnode1->sxPid.PropertyIdFromNameNode(); |
| if (!byteCodeGenerator->GetScriptContext()->IsNumericPropertyId(propertyId, &value)) |
| { |
| propertyIds->Item(propertyId); |
| } |
| |
| memberList = memberList->sxBin.pnode2; |
| } |
| |
| if (memberList->sxBin.pnode1->nop != knopComputedName && !hasComputedName) |
| { |
| propertyId = memberList->sxBin.pnode1->sxPid.PropertyIdFromNameNode(); |
| if (!byteCodeGenerator->GetScriptContext()->IsNumericPropertyId(propertyId, &value)) |
| { |
| propertyIds->Item(propertyId); |
| } |
| } |
| } |
| |
| argCount = propertyIds->Count(); |
| |
| memberList = pmemberList; |
| if ((memberList == nullptr) || (argCount == 0)) |
| { |
| // Empty literal or numeric property only object literal |
| byteCodeGenerator->Writer()->Reg1(Js::OpCode::NewScObjectSimple, objectLocation); |
| } |
| else |
| { |
| Js::PropertyIdArray *propIds = AnewPlus(byteCodeGenerator->GetAllocator(), argCount * sizeof(Js::PropertyId), Js::PropertyIdArray, argCount); |
| |
| if (propertyIds->ContainsKey(Js::PropertyIds::__proto__)) |
| { |
| // Always record whether the initializer contains __proto__ no matter if current environment has it enabled |
| // or not, in case the bytecode is later run with __proto__ enabled. |
| propIds->has__proto__ = true; |
| } |
| |
| unsigned int argIndex = 0; |
| while (memberList->nop == knopList) |
| { |
| if (memberList->sxBin.pnode1->sxBin.pnode1->nop == knopComputedName) |
| { |
| break; |
| } |
| propertyId = memberList->sxBin.pnode1->sxBin.pnode1->sxPid.PropertyIdFromNameNode(); |
| if (!byteCodeGenerator->GetScriptContext()->IsNumericPropertyId(propertyId, &value) && propertyIds->Remove(propertyId)) |
| { |
| propIds->elements[argIndex] = propertyId; |
| argIndex++; |
| } |
| memberList = memberList->sxBin.pnode2; |
| } |
| |
| if (memberList->sxBin.pnode1->nop != knopComputedName && !hasComputedName) |
| { |
| propertyId = memberList->sxBin.pnode1->sxPid.PropertyIdFromNameNode(); |
| if (!byteCodeGenerator->GetScriptContext()->IsNumericPropertyId(propertyId, &value) && propertyIds->Remove(propertyId)) |
| { |
| propIds->elements[argIndex] = propertyId; |
| argIndex++; |
| } |
| } |
| |
| uint32 literalObjectId = funcInfo->GetParsedFunctionBody()->NewObjectLiteral(); |
| |
| // Generate the opcode with propIds and cacheId |
| byteCodeGenerator->Writer()->Auxiliary(Js::OpCode::NewScObjectLiteral, objectLocation, propIds, sizeof(Js::PropertyIdArray) + argCount * sizeof(Js::PropertyId), literalObjectId); |
| |
| Adelete(byteCodeGenerator->GetAllocator(), propertyIds); |
| |
| AdeletePlus(byteCodeGenerator->GetAllocator(), argCount * sizeof(Js::PropertyId), propIds); |
| } |
| |
| memberList = pmemberList; |
| |
| bool useStore = false; |
| // Generate the actual assignment to those properties |
| if (memberList != nullptr) |
| { |
| while (memberList->nop == knopList) |
| { |
| ParseNode *memberNode = memberList->sxBin.pnode1; |
| |
| if (memberNode->sxBin.pnode1->nop == knopComputedName) |
| { |
| useStore = true; |
| } |
| |
| byteCodeGenerator->StartSubexpression(memberNode); |
| EmitMemberNode(memberNode, objectLocation, byteCodeGenerator, funcInfo, nullptr, useStore); |
| byteCodeGenerator->EndSubexpression(memberNode); |
| memberList = memberList->sxBin.pnode2; |
| } |
| |
| byteCodeGenerator->StartSubexpression(memberList); |
| EmitMemberNode(memberList, objectLocation, byteCodeGenerator, funcInfo, nullptr, useStore); |
| byteCodeGenerator->EndSubexpression(memberList); |
| } |
| } |
| |
| void EmitStringTemplate(ParseNode *pnode, ByteCodeGenerator *byteCodeGenerator, FuncInfo *funcInfo) |
| { |
| Assert(pnode->sxStrTemplate.pnodeStringLiterals); |
| |
| // For a tagged string template, we will create the callsite constant object as part of the FunctionBody constants table. |
| // We only need to emit code for non-tagged string templates here. |
| if (!pnode->sxStrTemplate.isTaggedTemplate) |
| { |
| // If we have no substitutions and this is not a tagged template, we can emit just the single cooked string. |
| if (pnode->sxStrTemplate.pnodeSubstitutionExpressions == nullptr) |
| { |
| Assert(pnode->sxStrTemplate.pnodeStringLiterals->nop != knopList); |
| |
| funcInfo->AcquireLoc(pnode); |
| Emit(pnode->sxStrTemplate.pnodeStringLiterals, byteCodeGenerator, funcInfo, false); |
| |
| Assert(pnode->location != pnode->sxStrTemplate.pnodeStringLiterals->location); |
| |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::Ld_A, pnode->location, pnode->sxStrTemplate.pnodeStringLiterals->location); |
| funcInfo->ReleaseLoc(pnode->sxStrTemplate.pnodeStringLiterals); |
| } |
| else |
| { |
| // If we have substitutions but no tag function, we can skip the callSite object construction (and also ignore raw strings). |
| funcInfo->AcquireLoc(pnode); |
| |
| // First string must be a list node since we have substitutions. |
| AssertMsg(pnode->sxStrTemplate.pnodeStringLiterals->nop == knopList, "First string in the list must be a knopList node."); |
| |
| ParseNode* stringNodeList = pnode->sxStrTemplate.pnodeStringLiterals; |
| |
| // Emit the first string and load that into the pnode location. |
| Emit(stringNodeList->sxBin.pnode1, byteCodeGenerator, funcInfo, false); |
| |
| Assert(pnode->location != stringNodeList->sxBin.pnode1->location); |
| |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::Ld_A, pnode->location, stringNodeList->sxBin.pnode1->location); |
| funcInfo->ReleaseLoc(stringNodeList->sxBin.pnode1); |
| |
| ParseNode* expressionNodeList = pnode->sxStrTemplate.pnodeSubstitutionExpressions; |
| ParseNode* stringNode; |
| ParseNode* expressionNode; |
| |
| // Now append the substitution expressions and remaining string constants via normal add operator |
| // We will always have one more string constant than substitution expression |
| // `strcon1 ${expr1} strcon2 ${expr2} strcon3` = strcon1 + expr1 + strcon2 + expr2 + strcon3 |
| // |
| // strcon1 --- step 1 (above) |
| // expr1 \__ step 2 |
| // strcon2 / |
| // expr2 \__ step 3 |
| // strcon3 / |
| while (stringNodeList->nop == knopList) |
| { |
| // If the current head of the expression list is a list, fetch the node and walk the list. |
| if (expressionNodeList->nop == knopList) |
| { |
| expressionNode = expressionNodeList->sxBin.pnode1; |
| expressionNodeList = expressionNodeList->sxBin.pnode2; |
| } |
| else |
| { |
| // This is the last element of the expression list. |
| expressionNode = expressionNodeList; |
| } |
| |
| // Emit the expression and append it to the string we're building. |
| Emit(expressionNode, byteCodeGenerator, funcInfo, false); |
| |
| Js::RegSlot toStringLocation = funcInfo->AcquireTmpRegister(); |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::Conv_Str, toStringLocation, expressionNode->location); |
| byteCodeGenerator->Writer()->Reg3(Js::OpCode::Add_A, pnode->location, pnode->location, toStringLocation); |
| funcInfo->ReleaseTmpRegister(toStringLocation); |
| funcInfo->ReleaseLoc(expressionNode); |
| |
| // Move to the next string in the list - we already got ahead of the expressions in the first string literal above. |
| stringNodeList = stringNodeList->sxBin.pnode2; |
| |
| // If the current head of the string literal list is also a list node, need to fetch the actual string literal node. |
| if (stringNodeList->nop == knopList) |
| { |
| stringNode = stringNodeList->sxBin.pnode1; |
| } |
| else |
| { |
| // This is the last element of the string literal list. |
| stringNode = stringNodeList; |
| } |
| |
| // Emit the string node following the previous expression and append it to the string. |
| // This is either just some string in the list or it is the last string. |
| Emit(stringNode, byteCodeGenerator, funcInfo, false); |
| byteCodeGenerator->Writer()->Reg3(Js::OpCode::Add_A, pnode->location, pnode->location, stringNode->location); |
| funcInfo->ReleaseLoc(stringNode); |
| } |
| } |
| } |
| } |
| |
| void SetNewArrayElements(ParseNode *pnode, Js::RegSlot arrayLocation, ByteCodeGenerator *byteCodeGenerator, FuncInfo *funcInfo) |
| { |
| ParseNode *args = pnode->sxUni.pnode1; |
| uint argCount = pnode->sxArrLit.count; |
| uint spreadCount = pnode->sxArrLit.spreadCount; |
| bool nativeArrays = CreateNativeArrays(byteCodeGenerator, funcInfo); |
| |
| bool arrayIntOpt = nativeArrays && pnode->sxArrLit.arrayOfInts; |
| if (arrayIntOpt) |
| { |
| int extraAlloc = argCount * sizeof(int32); |
| Js::AuxArray<int> *ints = AnewPlus(byteCodeGenerator->GetAllocator(), extraAlloc, Js::AuxArray<int32>, argCount); |
| EmitConstantArgsToIntArray(byteCodeGenerator, ints->elements, args, argCount); |
| Assert(!pnode->sxArrLit.hasMissingValues); |
| byteCodeGenerator->Writer()->Auxiliary( |
| Js::OpCode::NewScIntArray, |
| pnode->location, |
| ints, |
| sizeof(Js::AuxArray<int>) + extraAlloc, |
| argCount); |
| AdeletePlus(byteCodeGenerator->GetAllocator(), extraAlloc, ints); |
| return; |
| } |
| |
| bool arrayNumOpt = nativeArrays && pnode->sxArrLit.arrayOfNumbers; |
| if (arrayNumOpt) |
| { |
| int extraAlloc = argCount * sizeof(double); |
| Js::AuxArray<double> *doubles = AnewPlus(byteCodeGenerator->GetAllocator(), extraAlloc, Js::AuxArray<double>, argCount); |
| EmitConstantArgsToFltArray(byteCodeGenerator, doubles->elements, args, argCount); |
| Assert(!pnode->sxArrLit.hasMissingValues); |
| byteCodeGenerator->Writer()->Auxiliary( |
| Js::OpCode::NewScFltArray, |
| pnode->location, |
| doubles, |
| sizeof(Js::AuxArray<double>) + extraAlloc, |
| argCount); |
| AdeletePlus(byteCodeGenerator->GetAllocator(), extraAlloc, doubles); |
| return; |
| } |
| |
| bool arrayLitOpt = pnode->sxArrLit.arrayOfTaggedInts && pnode->sxArrLit.count > 1; |
| Assert(!arrayLitOpt || !nativeArrays); |
| |
| Js::RegSlot spreadArrLoc = arrayLocation; |
| Js::AuxArray<uint32> *spreadIndices = nullptr; |
| const uint extraAlloc = spreadCount * sizeof(uint32); |
| if (pnode->sxArrLit.spreadCount > 0) |
| { |
| arrayLocation = funcInfo->AcquireTmpRegister(); |
| spreadIndices = AnewPlus(byteCodeGenerator->GetAllocator(), extraAlloc, Js::AuxArray<uint32>, spreadCount); |
| } |
| |
| byteCodeGenerator->Writer()->Reg1Unsigned1( |
| pnode->sxArrLit.hasMissingValues ? Js::OpCode::NewScArrayWithMissingValues : Js::OpCode::NewScArray, |
| arrayLocation, |
| argCount); |
| |
| if (args != nullptr) |
| { |
| Js::OpCode opcode; |
| Js::RegSlot arrLoc; |
| if (argCount == 1 && !byteCodeGenerator->Writer()->DoProfileNewScArrayOp(Js::OpCode::NewScArray)) |
| { |
| opcode = Js::OpCode::StArrItemC_CI4; |
| arrLoc = arrayLocation; |
| } |
| else if (arrayLitOpt) |
| { |
| opcode = Js::OpCode::StArrSegItem_A; |
| arrLoc = funcInfo->AcquireTmpRegister(); |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::LdArrHead, arrLoc, arrayLocation); |
| } |
| else if (Js::JavascriptArray::HasInlineHeadSegment(argCount)) |
| { |
| // The head segment will be allocated inline as an interior pointer. To keep the array alive, the set operation |
| // should be done relative to the array header to keep it alive (instead of the array segment). |
| opcode = Js::OpCode::StArrInlineItem_CI4; |
| arrLoc = arrayLocation; |
| } |
| else if (argCount <= Js::JavascriptArray::MaxInitialDenseLength) |
| { |
| opcode = Js::OpCode::StArrSegItem_CI4; |
| arrLoc = funcInfo->AcquireTmpRegister(); |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::LdArrHead, arrLoc, arrayLocation); |
| } |
| else |
| { |
| opcode = Js::OpCode::StArrItemI_CI4; |
| arrLoc = arrayLocation; |
| } |
| |
| if (arrayLitOpt) |
| { |
| Js::VarArray *vars = AnewPlus(byteCodeGenerator->GetAllocator(), argCount * sizeof(Js::Var), Js::VarArray, argCount); |
| |
| EmitConstantArgsToVarArray(byteCodeGenerator, vars->elements, args, argCount); |
| |
| // Generate the opcode with vars |
| byteCodeGenerator->Writer()->Auxiliary(Js::OpCode::StArrSegItem_A, arrLoc, vars, sizeof(Js::VarArray) + argCount * sizeof(Js::Var), argCount); |
| |
| AdeletePlus(byteCodeGenerator->GetAllocator(), argCount * sizeof(Js::Var), vars); |
| } |
| else |
| { |
| uint i = 0; |
| unsigned spreadIndex = 0; |
| Js::RegSlot rhsLocation; |
| while (args->nop == knopList) |
| { |
| if (args->sxBin.pnode1->nop != knopEmpty) |
| { |
| Emit(args->sxBin.pnode1, byteCodeGenerator, funcInfo, false); |
| rhsLocation = args->sxBin.pnode1->location; |
| Js::RegSlot regVal = rhsLocation; |
| if (args->sxBin.pnode1->nop == knopEllipsis) |
| { |
| AnalysisAssert(spreadIndices); |
| regVal = funcInfo->AcquireTmpRegister(); |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::LdCustomSpreadIteratorList, regVal, rhsLocation); |
| spreadIndices->elements[spreadIndex++] = i; |
| } |
| |
| byteCodeGenerator->Writer()->ElementUnsigned1(opcode, regVal, arrLoc, i); |
| |
| if (args->sxBin.pnode1->nop == knopEllipsis) |
| { |
| funcInfo->ReleaseTmpRegister(regVal); |
| } |
| |
| funcInfo->ReleaseLoc(args->sxBin.pnode1); |
| } |
| |
| args = args->sxBin.pnode2; |
| i++; |
| } |
| |
| if (args->nop != knopEmpty) |
| { |
| Emit(args, byteCodeGenerator, funcInfo, false); |
| rhsLocation = args->location; |
| Js::RegSlot regVal = rhsLocation; |
| if (args->nop == knopEllipsis) |
| { |
| regVal = funcInfo->AcquireTmpRegister(); |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::LdCustomSpreadIteratorList, regVal, rhsLocation); |
| AnalysisAssert(spreadIndices); |
| spreadIndices->elements[spreadIndex] = i; |
| } |
| |
| byteCodeGenerator->Writer()->ElementUnsigned1(opcode, regVal, arrLoc, i); |
| |
| if (args->nop == knopEllipsis) |
| { |
| funcInfo->ReleaseTmpRegister(regVal); |
| } |
| |
| funcInfo->ReleaseLoc(args); |
| i++; |
| } |
| Assert(i <= argCount); |
| } |
| |
| if (arrLoc != arrayLocation) |
| { |
| funcInfo->ReleaseTmpRegister(arrLoc); |
| } |
| } |
| |
| if (pnode->sxArrLit.spreadCount > 0) |
| { |
| byteCodeGenerator->Writer()->Reg2Aux(Js::OpCode::SpreadArrayLiteral, spreadArrLoc, arrayLocation, spreadIndices, sizeof(Js::AuxArray<uint32>) + extraAlloc, extraAlloc); |
| AdeletePlus(byteCodeGenerator->GetAllocator(), extraAlloc, spreadIndices); |
| funcInfo->ReleaseTmpRegister(arrayLocation); |
| } |
| } |
| |
| // FIX: TODO: mixed-mode expressions (arithmetic expressions mixed with boolean expressions); current solution |
| // will not short-circuit in some cases and is not complete (for example: var i=(x==y)) |
| // This uses Aho and Ullman style double-branch generation (p. 494 ASU); we will need to peephole optimize or replace |
| // with special case for single-branch style. |
| void EmitBooleanExpression(ParseNode *expr, Js::ByteCodeLabel trueLabel, Js::ByteCodeLabel falseLabel, ByteCodeGenerator *byteCodeGenerator, |
| FuncInfo *funcInfo) |
| { |
| switch (expr->nop) |
| { |
| |
| case knopLogOr: |
| { |
| byteCodeGenerator->StartStatement(expr); |
| Js::ByteCodeLabel leftFalse = byteCodeGenerator->Writer()->DefineLabel(); |
| EmitBooleanExpression(expr->sxBin.pnode1, trueLabel, leftFalse, byteCodeGenerator, funcInfo); |
| funcInfo->ReleaseLoc(expr->sxBin.pnode1); |
| byteCodeGenerator->Writer()->MarkLabel(leftFalse); |
| EmitBooleanExpression(expr->sxBin.pnode2, trueLabel, falseLabel, byteCodeGenerator, funcInfo); |
| funcInfo->ReleaseLoc(expr->sxBin.pnode2); |
| byteCodeGenerator->EndStatement(expr); |
| break; |
| } |
| |
| case knopLogAnd: |
| { |
| byteCodeGenerator->StartStatement(expr); |
| Js::ByteCodeLabel leftTrue = byteCodeGenerator->Writer()->DefineLabel(); |
| EmitBooleanExpression(expr->sxBin.pnode1, leftTrue, falseLabel, byteCodeGenerator, funcInfo); |
| funcInfo->ReleaseLoc(expr->sxBin.pnode1); |
| byteCodeGenerator->Writer()->MarkLabel(leftTrue); |
| EmitBooleanExpression(expr->sxBin.pnode2, trueLabel, falseLabel, byteCodeGenerator, funcInfo); |
| funcInfo->ReleaseLoc(expr->sxBin.pnode2); |
| byteCodeGenerator->EndStatement(expr); |
| break; |
| } |
| |
| case knopLogNot: |
| byteCodeGenerator->StartStatement(expr); |
| EmitBooleanExpression(expr->sxUni.pnode1, falseLabel, trueLabel, byteCodeGenerator, funcInfo); |
| funcInfo->ReleaseLoc(expr->sxUni.pnode1); |
| byteCodeGenerator->EndStatement(expr); |
| break; |
| |
| case knopEq: |
| case knopEqv: |
| case knopNEqv: |
| case knopNe: |
| case knopLt: |
| case knopLe: |
| case knopGe: |
| case knopGt: |
| byteCodeGenerator->StartStatement(expr); |
| EmitBinaryOpnds(expr->sxBin.pnode1, expr->sxBin.pnode2, byteCodeGenerator, funcInfo); |
| funcInfo->ReleaseLoc(expr->sxBin.pnode2); |
| funcInfo->ReleaseLoc(expr->sxBin.pnode1); |
| byteCodeGenerator->Writer()->BrReg2(nopToOp[expr->nop], trueLabel, expr->sxBin.pnode1->location, |
| expr->sxBin.pnode2->location); |
| byteCodeGenerator->Writer()->Br(falseLabel); |
| byteCodeGenerator->EndStatement(expr); |
| break; |
| case knopTrue: |
| byteCodeGenerator->StartStatement(expr); |
| byteCodeGenerator->Writer()->Br(trueLabel); |
| byteCodeGenerator->EndStatement(expr); |
| break; |
| case knopFalse: |
| byteCodeGenerator->StartStatement(expr); |
| byteCodeGenerator->Writer()->Br(falseLabel); |
| byteCodeGenerator->EndStatement(expr); |
| break; |
| default: |
| // Note: we usually release the temp assigned to a node after we Emit it. |
| // But in this case, EmitBooleanExpression is just a wrapper around a normal Emit call, |
| // and the caller of EmitBooleanExpression expects to be able to release this register. |
| |
| // For diagnostics purposes, register the name and dot to the statement list. |
| if (expr->nop == knopName || expr->nop == knopDot) |
| { |
| byteCodeGenerator->StartStatement(expr); |
| Emit(expr, byteCodeGenerator, funcInfo, false); |
| byteCodeGenerator->Writer()->BrReg1(Js::OpCode::BrTrue_A, trueLabel, expr->location); |
| byteCodeGenerator->Writer()->Br(falseLabel); |
| byteCodeGenerator->EndStatement(expr); |
| } |
| else |
| { |
| Emit(expr, byteCodeGenerator, funcInfo, false); |
| byteCodeGenerator->Writer()->BrReg1(Js::OpCode::BrTrue_A, trueLabel, expr->location); |
| byteCodeGenerator->Writer()->Br(falseLabel); |
| } |
| break; |
| } |
| } |
| |
| // used by while and for loops |
| void EmitLoop( |
| ParseNode *loopNode, |
| ParseNode *cond, |
| ParseNode *body, |
| ParseNode *incr, |
| ByteCodeGenerator *byteCodeGenerator, |
| FuncInfo *funcInfo, |
| BOOL fReturnValue, |
| BOOL doWhile = FALSE, |
| ParseNode *forLoopBlock = nullptr) |
| { |
| // Need to increment loop count whether we are going to profile or not for HasLoop() |
| |
| Js::ByteCodeLabel loopEntrance = byteCodeGenerator->Writer()->DefineLabel(); |
| Js::ByteCodeLabel continuePastLoop = byteCodeGenerator->Writer()->DefineLabel(); |
| |
| uint loopId = byteCodeGenerator->Writer()->EnterLoop(loopEntrance); |
| loopNode->sxLoop.loopId = loopId; |
| |
| if (doWhile) |
| { |
| Emit(body, byteCodeGenerator, funcInfo, fReturnValue); |
| funcInfo->ReleaseLoc(body); |
| if (loopNode->emitLabels) |
| { |
| byteCodeGenerator->Writer()->MarkLabel(loopNode->sxStmt.continueLabel); |
| } |
| if (!ByteCodeGenerator::IsFalse(cond) || |
| byteCodeGenerator->IsInDebugMode()) |
| { |
| EmitBooleanExpression(cond, loopEntrance, continuePastLoop, byteCodeGenerator, funcInfo); |
| } |
| funcInfo->ReleaseLoc(cond); |
| } |
| else |
| { |
| if (cond) |
| { |
| if (!(cond->nop == knopInt && |
| cond->sxInt.lw != 0)) |
| { |
| Js::ByteCodeLabel trueLabel = byteCodeGenerator->Writer()->DefineLabel(); |
| EmitBooleanExpression(cond, trueLabel, continuePastLoop, byteCodeGenerator, funcInfo); |
| byteCodeGenerator->Writer()->MarkLabel(trueLabel); |
| } |
| funcInfo->ReleaseLoc(cond); |
| } |
| Emit(body, byteCodeGenerator, funcInfo, fReturnValue); |
| funcInfo->ReleaseLoc(body); |
| |
| if (byteCodeGenerator->IsES6ForLoopSemanticsEnabled() && |
| forLoopBlock != nullptr) |
| { |
| CloneEmitBlock(forLoopBlock, byteCodeGenerator, funcInfo); |
| } |
| |
| if (loopNode->emitLabels) |
| { |
| byteCodeGenerator->Writer()->MarkLabel(loopNode->sxStmt.continueLabel); |
| } |
| |
| if (incr != nullptr) |
| { |
| Emit(incr, byteCodeGenerator, funcInfo, false); |
| funcInfo->ReleaseLoc(incr); |
| } |
| |
| byteCodeGenerator->Writer()->Br(loopEntrance); |
| } |
| |
| byteCodeGenerator->Writer()->MarkLabel(continuePastLoop); |
| if (loopNode->emitLabels) |
| { |
| byteCodeGenerator->Writer()->MarkLabel(loopNode->sxStmt.breakLabel); |
| } |
| |
| byteCodeGenerator->Writer()->ExitLoop(loopId); |
| } |
| |
| void ByteCodeGenerator::EmitInvertedLoop(ParseNode* outerLoop, ParseNode* invertedLoop, FuncInfo* funcInfo) |
| { |
| Js::ByteCodeLabel invertedLoopLabel = this->m_writer.DefineLabel(); |
| Js::ByteCodeLabel afterInvertedLoop = this->m_writer.DefineLabel(); |
| |
| // emit branch around original |
| Emit(outerLoop->sxFor.pnodeInit, this, funcInfo, false); |
| funcInfo->ReleaseLoc(outerLoop->sxFor.pnodeInit); |
| this->m_writer.BrS(Js::OpCode::BrNotHasSideEffects, invertedLoopLabel, Js::SideEffects_Any); |
| |
| // emit original |
| EmitLoop(outerLoop, outerLoop->sxFor.pnodeCond, outerLoop->sxFor.pnodeBody, |
| outerLoop->sxFor.pnodeIncr, this, funcInfo, false); |
| |
| // clear temporary registers since inverted loop may share nodes with |
| // emitted original loop |
| VisitClearTmpRegs(outerLoop, this, funcInfo); |
| |
| // emit branch around inverted |
| this->m_writer.Br(afterInvertedLoop); |
| this->m_writer.MarkLabel(invertedLoopLabel); |
| |
| // Emit a zero trip test for the original outer-loop |
| Js::ByteCodeLabel zeroTrip = this->m_writer.DefineLabel(); |
| ParseNode* testNode = this->GetParser()->CopyPnode(outerLoop->sxFor.pnodeCond); |
| EmitBooleanExpression(testNode, zeroTrip, afterInvertedLoop, this, funcInfo); |
| this->m_writer.MarkLabel(zeroTrip); |
| funcInfo->ReleaseLoc(testNode); |
| |
| // emit inverted |
| Emit(invertedLoop->sxFor.pnodeInit, this, funcInfo, false); |
| funcInfo->ReleaseLoc(invertedLoop->sxFor.pnodeInit); |
| EmitLoop(invertedLoop, invertedLoop->sxFor.pnodeCond, invertedLoop->sxFor.pnodeBody, |
| invertedLoop->sxFor.pnodeIncr, this, funcInfo, false); |
| this->m_writer.MarkLabel(afterInvertedLoop); |
| } |
| |
| void EmitGetIterator(Js::RegSlot iteratorLocation, Js::RegSlot iterableLocation, ByteCodeGenerator* byteCodeGenerator, FuncInfo* funcInfo) |
| { |
| // get iterator object from the iterable |
| EmitInvoke(iteratorLocation, iterableLocation, Js::PropertyIds::_symbolIterator, byteCodeGenerator, funcInfo); |
| |
| // throw TypeError if the result is not an object |
| Js::ByteCodeLabel skipThrow = byteCodeGenerator->Writer()->DefineLabel(); |
| byteCodeGenerator->Writer()->BrReg1(Js::OpCode::BrOnObject_A, skipThrow, iteratorLocation); |
| byteCodeGenerator->Writer()->W1(Js::OpCode::RuntimeTypeError, SCODE_CODE(JSERR_NeedObject)); |
| byteCodeGenerator->Writer()->MarkLabel(skipThrow); |
| } |
| |
| void EmitIteratorNext(Js::RegSlot itemLocation, Js::RegSlot iteratorLocation, Js::RegSlot nextInputLocation, ByteCodeGenerator* byteCodeGenerator, FuncInfo* funcInfo) |
| { |
| // invoke next() on the iterator |
| if (nextInputLocation == Js::Constants::NoRegister) |
| { |
| EmitInvoke(itemLocation, iteratorLocation, Js::PropertyIds::next, byteCodeGenerator, funcInfo); |
| } |
| else |
| { |
| EmitInvoke(itemLocation, iteratorLocation, Js::PropertyIds::next, byteCodeGenerator, funcInfo, nextInputLocation); |
| } |
| |
| // throw TypeError if the result is not an object |
| Js::ByteCodeLabel skipThrow = byteCodeGenerator->Writer()->DefineLabel(); |
| byteCodeGenerator->Writer()->BrReg1(Js::OpCode::BrOnObject_A, skipThrow, itemLocation); |
| byteCodeGenerator->Writer()->W1(Js::OpCode::RuntimeTypeError, SCODE_CODE(JSERR_NeedObject)); |
| byteCodeGenerator->Writer()->MarkLabel(skipThrow); |
| } |
| |
| void EmitIteratorComplete(Js::RegSlot doneLocation, Js::RegSlot iteratorResultLocation, ByteCodeGenerator* byteCodeGenerator, FuncInfo* funcInfo) |
| { |
| // get the iterator result's "done" property |
| uint cacheId = funcInfo->FindOrAddInlineCacheId(iteratorResultLocation, Js::PropertyIds::done, false, false); |
| byteCodeGenerator->Writer()->PatchableProperty(Js::OpCode::LdFld, doneLocation, iteratorResultLocation, cacheId); |
| |
| // Do not need to do ToBoolean explicitly with current uses of EmitIteratorComplete since BrTrue_A does this. |
| // Add a ToBoolean controlled by template flag if needed for new uses later on. |
| } |
| |
| void EmitIteratorValue(Js::RegSlot valueLocation, Js::RegSlot iteratorResultLocation, ByteCodeGenerator* byteCodeGenerator, FuncInfo* funcInfo) |
| { |
| // get the iterator result's "value" property |
| uint cacheId = funcInfo->FindOrAddInlineCacheId(iteratorResultLocation, Js::PropertyIds::value, false, false); |
| byteCodeGenerator->Writer()->PatchableProperty(Js::OpCode::LdFld, valueLocation, iteratorResultLocation, cacheId); |
| } |
| |
| void EmitForInOrForOf(ParseNode *loopNode, ByteCodeGenerator *byteCodeGenerator, FuncInfo *funcInfo, BOOL fReturnValue) |
| { |
| bool isForIn = (loopNode->nop == knopForIn); |
| Assert(isForIn || loopNode->nop == knopForOf); |
| |
| BeginEmitBlock(loopNode->sxForInOrForOf.pnodeBlock, byteCodeGenerator, funcInfo); |
| |
| byteCodeGenerator->StartStatement(loopNode); |
| funcInfo->AcquireLoc(loopNode); |
| |
| // Record the branch bytecode offset. |
| // This is used for "ignore exception" and "set next stmt" scenarios. See ProbeContainer::GetNextUserStatementOffsetForAdvance: |
| // If there is a branch recorded between current offset and next stmt offset, we'll use offset of the branch recorded, |
| // otherwise use offset of next stmt. |
| // The idea here is that when we bail out after ignore exception, we need to bail out to the beginning of the ForIn, |
| // but currently ForIn stmt starts at the condition part, which is needed for correct handling of break point on ForIn |
| // (break every time on the loop back edge) and correct display of current statement under debugger. |
| // See WinBlue 231880 for details. |
| byteCodeGenerator->Writer()->RecordStatementAdjustment(Js::FunctionBody::SAT_All); |
| if (byteCodeGenerator->IsES6ForLoopSemanticsEnabled() && |
| loopNode->sxForInOrForOf.pnodeBlock->sxBlock.HasBlockScopedContent()) |
| { |
| byteCodeGenerator->Writer()->RecordForInOrOfCollectionScope(); |
| } |
| Js::ByteCodeLabel loopEntrance = byteCodeGenerator->Writer()->DefineLabel(); |
| Js::ByteCodeLabel continuePastLoop = byteCodeGenerator->Writer()->DefineLabel(); |
| Js::ByteCodeLabel skipPastLoop = byteCodeGenerator->Writer()->DefineLabel(); |
| |
| if (loopNode->sxForInOrForOf.pnodeLval->nop == knopVarDecl) |
| { |
| EmitReference(loopNode->sxForInOrForOf.pnodeLval, byteCodeGenerator, funcInfo); |
| } |
| |
| Emit(loopNode->sxForInOrForOf.pnodeObj, byteCodeGenerator, funcInfo, false); // evaluate collection expression |
| funcInfo->ReleaseLoc(loopNode->sxForInOrForOf.pnodeObj); |
| |
| if (byteCodeGenerator->IsES6ForLoopSemanticsEnabled()) |
| { |
| EndEmitBlock(loopNode->sxForInOrForOf.pnodeBlock, byteCodeGenerator, funcInfo); |
| if (loopNode->sxForInOrForOf.pnodeBlock->sxBlock.scope != nullptr) |
| { |
| loopNode->sxForInOrForOf.pnodeBlock->sxBlock.scope->ForEachSymbol([](Symbol *sym) { |
| sym->SetIsTrackedForDebugger(false); |
| }); |
| } |
| } |
| |
| // Grab registers for the enumerator and for the current enumerated item. |
| // The enumerator register will be released after this call returns. |
| loopNode->sxForInOrForOf.itemLocation = funcInfo->AcquireTmpRegister(); |
| |
| if (isForIn) |
| { |
| // get enumerator from the collection |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::GetForInEnumerator, loopNode->location, loopNode->sxForInOrForOf.pnodeObj->location); |
| } |
| else |
| { |
| // We want call profile information on the @@iterator call, so instead of adding a GetForOfIterator bytecode op |
| // to do all the following work in a helper do it explicitly in bytecode so that the @@iterator call is exposed |
| // to the profiler and JIT. |
| |
| // If collection is null or undefined, don't enter the loop. |
| byteCodeGenerator->Writer()->BrReg2(Js::OpCode::BrSrEq_A, skipPastLoop, loopNode->sxForInOrForOf.pnodeObj->location, funcInfo->nullConstantRegister); |
| byteCodeGenerator->Writer()->BrReg2(Js::OpCode::BrSrEq_A, skipPastLoop, loopNode->sxForInOrForOf.pnodeObj->location, funcInfo->undefinedConstantRegister); |
| |
| // do a ToObject on the collection |
| Js::RegSlot tmpObj = funcInfo->AcquireTmpRegister(); |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::Conv_Obj, tmpObj, loopNode->sxForInOrForOf.pnodeObj->location); |
| |
| EmitGetIterator(loopNode->location, tmpObj, byteCodeGenerator, funcInfo); |
| funcInfo->ReleaseTmpRegister(tmpObj); |
| } |
| byteCodeGenerator->EndStatement(loopNode); |
| |
| // Need to increment loop count whether we are going into profile or not for HasLoop() |
| uint loopId = byteCodeGenerator->Writer()->EnterLoop(loopEntrance); |
| loopNode->sxForInOrForOf.loopId = loopId; |
| |
| byteCodeGenerator->StartStatement(loopNode->sxForInOrForOf.pnodeLval); |
| |
| if (isForIn) |
| { |
| // branch past loop when GetCurrentAndMoveNext returns nullptr |
| byteCodeGenerator->Writer()->BrReg2(Js::OpCode::BrOnEmpty, continuePastLoop, loopNode->sxForInOrForOf.itemLocation, loopNode->location); |
| } |
| else |
| { |
| EmitIteratorNext(loopNode->sxForInOrForOf.itemLocation, loopNode->location, Js::Constants::NoRegister, byteCodeGenerator, funcInfo); |
| |
| Js::RegSlot doneLocation = funcInfo->AcquireTmpRegister(); |
| EmitIteratorComplete(doneLocation, loopNode->sxForInOrForOf.itemLocation, byteCodeGenerator, funcInfo); |
| |
| // branch past loop if the result's done property is truthy |
| byteCodeGenerator->Writer()->BrReg1(Js::OpCode::BrTrue_A, continuePastLoop, doneLocation); |
| funcInfo->ReleaseTmpRegister(doneLocation); |
| |
| // otherwise put result's value property in itemLocation |
| EmitIteratorValue(loopNode->sxForInOrForOf.itemLocation, loopNode->sxForInOrForOf.itemLocation, byteCodeGenerator, funcInfo); |
| } |
| |
| if (loopNode->sxForInOrForOf.pnodeLval->nop != knopVarDecl && |
| loopNode->sxForInOrForOf.pnodeLval->nop != knopLetDecl && |
| loopNode->sxForInOrForOf.pnodeLval->nop != knopConstDecl) |
| { |
| EmitReference(loopNode->sxForInOrForOf.pnodeLval, byteCodeGenerator, funcInfo); |
| } |
| else |
| { |
| Symbol * sym = loopNode->sxForInOrForOf.pnodeLval->sxVar.sym; |
| sym->SetNeedDeclaration(false); |
| } |
| |
| if (byteCodeGenerator->IsES6ForLoopSemanticsEnabled()) |
| { |
| BeginEmitBlock(loopNode->sxForInOrForOf.pnodeBlock, byteCodeGenerator, funcInfo); |
| } |
| |
| EmitAssignment(nullptr, loopNode->sxForInOrForOf.pnodeLval, loopNode->sxForInOrForOf.itemLocation, byteCodeGenerator, funcInfo); |
| |
| byteCodeGenerator->EndStatement(loopNode->sxForInOrForOf.pnodeLval); |
| |
| funcInfo->ReleaseReference(loopNode->sxForInOrForOf.pnodeLval); |
| |
| Emit(loopNode->sxForInOrForOf.pnodeBody, byteCodeGenerator, funcInfo, fReturnValue); |
| funcInfo->ReleaseLoc(loopNode->sxForInOrForOf.pnodeBody); |
| |
| if (byteCodeGenerator->IsES6ForLoopSemanticsEnabled()) |
| { |
| EndEmitBlock(loopNode->sxForInOrForOf.pnodeBlock, byteCodeGenerator, funcInfo); |
| } |
| |
| funcInfo->ReleaseTmpRegister(loopNode->sxForInOrForOf.itemLocation); |
| if (loopNode->emitLabels) |
| { |
| byteCodeGenerator->Writer()->MarkLabel(loopNode->sxForInOrForOf.continueLabel); |
| } |
| byteCodeGenerator->Writer()->Br(loopEntrance); |
| byteCodeGenerator->Writer()->MarkLabel(continuePastLoop); |
| if (loopNode->emitLabels) |
| { |
| byteCodeGenerator->Writer()->MarkLabel(loopNode->sxForInOrForOf.breakLabel); |
| } |
| byteCodeGenerator->Writer()->ExitLoop(loopId); |
| |
| if (isForIn) |
| { |
| byteCodeGenerator->Writer()->Reg1(Js::OpCode::ReleaseForInEnumerator, loopNode->location); |
| } |
| else |
| { |
| byteCodeGenerator->Writer()->MarkLabel(skipPastLoop); |
| } |
| |
| if (!byteCodeGenerator->IsES6ForLoopSemanticsEnabled()) |
| { |
| EndEmitBlock(loopNode->sxForInOrForOf.pnodeBlock, byteCodeGenerator, funcInfo); |
| } |
| } |
| |
| void EmitArrayLiteral(ParseNode *pnode, ByteCodeGenerator *byteCodeGenerator, FuncInfo *funcInfo) |
| { |
| funcInfo->AcquireLoc(pnode); |
| ParseNode *args = pnode->sxUni.pnode1; |
| if (args == nullptr) |
| { |
| byteCodeGenerator->Writer()->Reg1Unsigned1( |
| pnode->sxArrLit.hasMissingValues ? Js::OpCode::NewScArrayWithMissingValues : Js::OpCode::NewScArray, |
| pnode->location, |
| ByteCodeGenerator::DefaultArraySize); |
| } |
| else |
| { |
| SetNewArrayElements(pnode, pnode->location, byteCodeGenerator, funcInfo); |
| } |
| } |
| |
| void EmitJumpCleanup(ParseNode *pnode, ParseNode *pnodeTarget, ByteCodeGenerator *byteCodeGenerator, FuncInfo * funcInfo) |
| { |
| for (; pnode != pnodeTarget; pnode = pnode->sxStmt.pnodeOuter) |
| { |
| switch (pnode->nop) |
| { |
| case knopTry: |
| case knopCatch: |
| case knopFinally: |
| // We insert OpCode::Leave when there is a 'return' inside try/catch/finally. |
| // This is for flow control and does not participate in identifying boundaries of try/catch blocks, |
| // thus we shouldn't call RecordCrossFrameEntryExitRecord() here. |
| byteCodeGenerator->Writer()->Empty(Js::OpCode::Leave); |
| break; |
| |
| #if ENABLE_PROFILE_INFO |
| case knopWhile: |
| case knopDoWhile: |
| case knopFor: |
| case knopForIn: |
| case knopForOf: |
| if (Js::DynamicProfileInfo::EnableImplicitCallFlags(funcInfo->GetParsedFunctionBody())) |
| { |
| byteCodeGenerator->Writer()->Unsigned1(Js::OpCode::ProfiledLoopEnd, pnode->sxLoop.loopId); |
| } |
| #endif |
| } |
| } |
| } |
| |
| void EmitBinaryOpnds(ParseNode *pnode1, ParseNode *pnode2, ByteCodeGenerator *byteCodeGenerator, FuncInfo *funcInfo) |
| { |
| // If opnd2 can overwrite opnd1, make sure the value of opnd1 is stashed away. |
| if (MayHaveSideEffectOnNode(pnode1, pnode2)) |
| { |
| SaveOpndValue(pnode1, funcInfo); |
| } |
| |
| Emit(pnode1, byteCodeGenerator, funcInfo, false); |
| |
| if (pnode1->nop == knopComputedName && pnode2->nop == knopClassDecl && |
| (pnode2->sxClass.pnodeConstructor == nullptr || pnode2->sxClass.pnodeConstructor->nop != knopVarDecl)) |
| { |
| Emit(pnode2, byteCodeGenerator, funcInfo, false, false, pnode1); |
| } |
| else |
| { |
| Emit(pnode2, byteCodeGenerator, funcInfo, false); |
| } |
| } |
| |
| void EmitBinaryReference(ParseNode *pnode1, ParseNode *pnode2, ByteCodeGenerator *byteCodeGenerator, FuncInfo *funcInfo, BOOL fLoadLhs) |
| { |
| // Make sure that the RHS of an assignment doesn't kill the opnd's of the expression on the LHS. |
| switch (pnode1->nop) |
| { |
| case knopName: |
| if (fLoadLhs && MayHaveSideEffectOnNode(pnode1, pnode2)) |
| { |
| // Given x op y, y may kill x, so stash x. |
| // Note that this only matters if we're loading x prior to the op. |
| SaveOpndValue(pnode1, funcInfo); |
| } |
| break; |
| case knopDot: |
| if (fLoadLhs) |
| { |
| // We're loading the value of the LHS before the RHS, so make sure the LHS gets a register first. |
| funcInfo->AcquireLoc(pnode1); |
| } |
| if (MayHaveSideEffectOnNode(pnode1->sxBin.pnode1, pnode2)) |
| { |
| // Given x.y op z, z may kill x, so stash x away. |
| SaveOpndValue(pnode1->sxBin.pnode1, funcInfo); |
| } |
| break; |
| case knopIndex: |
| if (fLoadLhs) |
| { |
| // We're loading the value of the LHS before the RHS, so make sure the LHS gets a register first. |
| funcInfo->AcquireLoc(pnode1); |
| } |
| if (MayHaveSideEffectOnNode(pnode1->sxBin.pnode1, pnode2) || |
| MayHaveSideEffectOnNode(pnode1->sxBin.pnode1, pnode1->sxBin.pnode2)) |
| { |
| // Given x[y] op z, y or z may kill x, so stash x away. |
| SaveOpndValue(pnode1->sxBin.pnode1, funcInfo); |
| } |
| if (MayHaveSideEffectOnNode(pnode1->sxBin.pnode2, pnode2)) |
| { |
| // Given x[y] op z, z may kill y, so stash y away. |
| // But make sure that x gets a register before y. |
| funcInfo->AcquireLoc(pnode1->sxBin.pnode1); |
| SaveOpndValue(pnode1->sxBin.pnode2, funcInfo); |
| } |
| break; |
| } |
| |
| if (fLoadLhs) |
| { |
| // Emit code to load the value of the LHS. |
| EmitLoad(pnode1, byteCodeGenerator, funcInfo); |
| } |
| else |
| { |
| // Emit code to evaluate the LHS opnds, but don't load the LHS's value. |
| EmitReference(pnode1, byteCodeGenerator, funcInfo); |
| } |
| |
| // Evaluate the RHS. |
| Emit(pnode2, byteCodeGenerator, funcInfo, false); |
| } |
| |
| void EmitUseBeforeDeclarationRuntimeError(ByteCodeGenerator * byteCodeGenerator, Js::RegSlot location) |
| { |
| byteCodeGenerator->Writer()->W1(Js::OpCode::RuntimeReferenceError, SCODE_CODE(JSERR_UseBeforeDeclaration)); |
| |
| if (location != Js::Constants::NoRegister) |
| { |
| // Optionally load something into register in order to do not confuse IRBuilder. This value will never be used. |
| byteCodeGenerator->Writer()->Reg1(Js::OpCode::LdUndef, location); |
| } |
| } |
| |
| void EmitUseBeforeDeclaration(Symbol *sym, ByteCodeGenerator *byteCodeGenerator, FuncInfo *funcInfo) |
| { |
| // Don't emit static use-before-declaration error in a closure or dynamic scope case. We detect such cases with dynamic checks, |
| // if necessary. |
| if (sym != nullptr && |
| !sym->GetIsModuleExportStorage() && |
| sym->GetNeedDeclaration() && |
| byteCodeGenerator->GetCurrentScope()->HasStaticPathToAncestor(sym->GetScope()) && |
| sym->GetScope()->GetFunc() == funcInfo) |
| { |
| EmitUseBeforeDeclarationRuntimeError(byteCodeGenerator, Js::Constants::NoRegister); |
| } |
| } |
| |
| void EmitBinary(Js::OpCode opcode, ParseNode *pnode, ByteCodeGenerator *byteCodeGenerator, FuncInfo *funcInfo) |
| { |
| byteCodeGenerator->StartStatement(pnode); |
| EmitBinaryOpnds(pnode->sxBin.pnode1, pnode->sxBin.pnode2, byteCodeGenerator, funcInfo); |
| funcInfo->ReleaseLoc(pnode->sxBin.pnode2); |
| funcInfo->ReleaseLoc(pnode->sxBin.pnode1); |
| funcInfo->AcquireLoc(pnode); |
| byteCodeGenerator->Writer()->Reg3(opcode, |
| pnode->location, |
| pnode->sxBin.pnode1->location, |
| pnode->sxBin.pnode2->location); |
| byteCodeGenerator->EndStatement(pnode); |
| } |
| |
| bool CollectConcat(ParseNode *pnodeAdd, DListCounted<ParseNode *, ArenaAllocator>& concatOpnds, ArenaAllocator *arenaAllocator) |
| { |
| Assert(pnodeAdd->nop == knopAdd); |
| Assert(pnodeAdd->CanFlattenConcatExpr()); |
| |
| bool doConcatString = false; |
| DList<ParseNode*, ArenaAllocator> pnodeStack(arenaAllocator); |
| pnodeStack.Prepend(pnodeAdd->sxBin.pnode2); |
| ParseNode * pnode = pnodeAdd->sxBin.pnode1; |
| while (true) |
| { |
| if (!pnode->CanFlattenConcatExpr()) |
| { |
| concatOpnds.Append(pnode); |
| } |
| else if (pnode->nop == knopStr) |
| { |
| concatOpnds.Append(pnode); |
| |
| // Detect if there are any string larger then the append size limit. |
| // If there are, we can do concat; otherwise, still use add so we will not lose the AddLeftDead opportunities. |
| doConcatString = doConcatString || !Js::CompoundString::ShouldAppendChars(pnode->sxPid.pid->Cch()); |
| } |
| else |
| { |
| Assert(pnode->nop == knopAdd); |
| pnodeStack.Prepend(pnode->sxBin.pnode2); |
| pnode = pnode->sxBin.pnode1; |
| continue; |
| } |
| |
| if (pnodeStack.Empty()) |
| { |
| break; |
| } |
| |
| pnode = pnodeStack.Head(); |
| pnodeStack.RemoveHead(); |
| } |
| |
| return doConcatString; |
| } |
| |
| void EmitConcat3(ParseNode *pnode, ParseNode *pnode1, ParseNode *pnode2, ParseNode *pnode3, ByteCodeGenerator *byteCodeGenerator, FuncInfo *funcInfo) |
| { |
| byteCodeGenerator->StartStatement(pnode); |
| if (MayHaveSideEffectOnNode(pnode1, pnode2) || MayHaveSideEffectOnNode(pnode1, pnode3)) |
| { |
| SaveOpndValue(pnode1, funcInfo); |
| } |
| |
| if (MayHaveSideEffectOnNode(pnode2, pnode3)) |
| { |
| SaveOpndValue(pnode2, funcInfo); |
| } |
| |
| Emit(pnode1, byteCodeGenerator, funcInfo, false); |
| Emit(pnode2, byteCodeGenerator, funcInfo, false); |
| Emit(pnode3, byteCodeGenerator, funcInfo, false); |
| funcInfo->ReleaseLoc(pnode3); |
| funcInfo->ReleaseLoc(pnode2); |
| funcInfo->ReleaseLoc(pnode1); |
| funcInfo->AcquireLoc(pnode); |
| byteCodeGenerator->Writer()->Reg4(Js::OpCode::Concat3, |
| pnode->location, |
| pnode1->location, |
| pnode2->location, |
| pnode3->location); |
| byteCodeGenerator->EndStatement(pnode); |
| } |
| |
| void EmitNewConcatStrMulti(ParseNode *pnode, uint8 count, ParseNode *pnode1, ParseNode *pnode2, ByteCodeGenerator *byteCodeGenerator, FuncInfo *funcInfo) |
| { |
| EmitBinaryOpnds(pnode1, pnode2, byteCodeGenerator, funcInfo); |
| funcInfo->ReleaseLoc(pnode2); |
| funcInfo->ReleaseLoc(pnode1); |
| funcInfo->AcquireLoc(pnode); |
| byteCodeGenerator->Writer()->Reg3B1(Js::OpCode::NewConcatStrMulti, |
| pnode->location, |
| pnode1->location, |
| pnode2->location, |
| count); |
| } |
| |
| void EmitAdd(ParseNode *pnode, ByteCodeGenerator *byteCodeGenerator, FuncInfo *funcInfo) |
| { |
| Assert(pnode->nop == knopAdd); |
| |
| if (pnode->CanFlattenConcatExpr()) |
| { |
| // We should only have a string concat if the feature is on. |
| Assert(!PHASE_OFF1(Js::ByteCodeConcatExprOptPhase)); |
| DListCounted<ParseNode*, ArenaAllocator> concatOpnds(byteCodeGenerator->GetAllocator()); |
| bool doConcatString = CollectConcat(pnode, concatOpnds, byteCodeGenerator->GetAllocator()); |
| if (doConcatString) |
| { |
| uint concatCount = concatOpnds.Count(); |
| Assert(concatCount >= 2); |
| |
| // Don't do concatN if the number is too high |
| // CONSIDER: although we could have done multiple ConcatNs |
| if (concatCount > 2 && concatCount <= UINT8_MAX) |
| { |
| #if DBG |
| char16 debugStringBuffer[MAX_FUNCTION_BODY_DEBUG_STRING_SIZE]; |
| #endif |
| ParseNode * pnode1 = concatOpnds.Head(); |
| concatOpnds.RemoveHead(); |
| ParseNode * pnode2 = concatOpnds.Head(); |
| concatOpnds.RemoveHead(); |
| if (concatCount == 3) |
| { |
| OUTPUT_TRACE_DEBUGONLY(Js::ByteCodeConcatExprOptPhase, _u("%s(%s) offset:#%d : Concat3\n"), |
| funcInfo->GetParsedFunctionBody()->GetDisplayName(), |
| funcInfo->GetParsedFunctionBody()->GetDebugNumberSet(debugStringBuffer), |
| byteCodeGenerator->Writer()->ByteCodeDataSize()); |
| EmitConcat3(pnode, pnode1, pnode2, concatOpnds.Head(), byteCodeGenerator, funcInfo); |
| return; |
| } |
| |
| OUTPUT_TRACE_DEBUGONLY(Js::ByteCodeConcatExprOptPhase, _u("%s(%s) offset:#%d: ConcatMulti %d\n"), |
| funcInfo->GetParsedFunctionBody()->GetDisplayName(), |
| funcInfo->GetParsedFunctionBody()->GetDebugNumberSet(debugStringBuffer), |
| byteCodeGenerator->Writer()->ByteCodeDataSize(), concatCount); |
| byteCodeGenerator->StartStatement(pnode); |
| funcInfo->AcquireLoc(pnode); |
| |
| // CONSIDER: this may cause the backend not able CSE repeating pattern within the concat. |
| EmitNewConcatStrMulti(pnode, (uint8)concatCount, pnode1, pnode2, byteCodeGenerator, funcInfo); |
| |
| uint i = 2; |
| do |
| { |
| ParseNode * currNode = concatOpnds.Head(); |
| concatOpnds.RemoveHead(); |
| ParseNode * currNode2 = concatOpnds.Head(); |
| concatOpnds.RemoveHead(); |
| |
| EmitBinaryOpnds(currNode, currNode2, byteCodeGenerator, funcInfo); |
| funcInfo->ReleaseLoc(currNode2); |
| funcInfo->ReleaseLoc(currNode); |
| byteCodeGenerator->Writer()->Reg3B1( |
| Js::OpCode::SetConcatStrMultiItem2, pnode->location, currNode->location, currNode2->location, (uint8)i); |
| i += 2; |
| } |
| while (concatOpnds.Count() > 1); |
| |
| if (!concatOpnds.Empty()) |
| { |
| ParseNode * currNode = concatOpnds.Head(); |
| Emit(currNode, byteCodeGenerator, funcInfo, false); |
| funcInfo->ReleaseLoc(currNode); |
| byteCodeGenerator->Writer()->Reg2B1( |
| Js::OpCode::SetConcatStrMultiItem, pnode->location, currNode->location, (uint8)i); |
| i++; |
| } |
| |
| Assert(concatCount == i); |
| byteCodeGenerator->EndStatement(pnode); |
| return; |
| } |
| } |
| |
| // Since we collected all the node already, let's just emit them instead of doing it recursively. |
| byteCodeGenerator->StartStatement(pnode); |
| ParseNode * currNode = concatOpnds.Head(); |
| concatOpnds.RemoveHead(); |
| ParseNode * currNode2 = concatOpnds.Head(); |
| concatOpnds.RemoveHead(); |
| |
| EmitBinaryOpnds(currNode, currNode2, byteCodeGenerator, funcInfo); |
| funcInfo->ReleaseLoc(currNode2); |
| funcInfo->ReleaseLoc(currNode); |
| Js::RegSlot dstReg = funcInfo->AcquireLoc(pnode); |
| byteCodeGenerator->Writer()->Reg3( |
| Js::OpCode::Add_A, dstReg, currNode->location, currNode2->location); |
| while (!concatOpnds.Empty()) |
| { |
| currNode = concatOpnds.Head(); |
| concatOpnds.RemoveHead(); |
| Emit(currNode, byteCodeGenerator, funcInfo, false); |
| funcInfo->ReleaseLoc(currNode); |
| byteCodeGenerator->Writer()->Reg3( |
| Js::OpCode::Add_A, dstReg, dstReg, currNode->location); |
| } |
| byteCodeGenerator->EndStatement(pnode); |
| } |
| else |
| { |
| EmitBinary(Js::OpCode::Add_A, pnode, byteCodeGenerator, funcInfo); |
| } |
| } |
| |
| void EmitSuperFieldPatch(FuncInfo* funcInfo, ParseNode* pnode, ByteCodeGenerator* byteCodeGenerator) |
| { |
| ParseNodePtr propFuncNode = funcInfo->root; |
| |
| if (byteCodeGenerator->GetFlags() & fscrEval) |
| { |
| // If we are inside an eval, ScopedLdSuper will take care of the patch. |
| return; |
| } |
| |
| if (funcInfo->IsLambda()) |
| { |
| FuncInfo *parent = byteCodeGenerator->FindEnclosingNonLambda(); |
| propFuncNode = parent->root; |
| } |
| |
| // No need to emit a LdFld for the constructor. |
| if (propFuncNode->sxFnc.IsClassConstructor()) |
| { |
| return; |
| } |
| |
| if (!propFuncNode->sxFnc.IsClassMember() || propFuncNode->sxFnc.pid == nullptr) |
| { |
| // Non-methods will fail lookup. |
| return; |
| } |
| if (propFuncNode->sxFnc.pid->GetPropertyId() == Js::Constants::NoProperty) |
| { |
| byteCodeGenerator->AssignPropertyId(propFuncNode->sxFnc.pid); |
| } |
| |
| // Load the current method's property ID from super instead of using super directly. |
| Js::RegSlot superLoc = funcInfo->superRegister; |
| pnode->sxCall.pnodeTarget->location = Js::Constants::NoRegister; |
| Js::RegSlot superPropLoc = funcInfo->AcquireLoc(pnode->sxCall.pnodeTarget); |
| Js::PropertyId propertyId = propFuncNode->sxFnc.pid->GetPropertyId(); |
| uint cacheId = funcInfo->FindOrAddInlineCacheId(superLoc, propertyId, true, false); |
| byteCodeGenerator->Writer()->PatchableProperty(Js::OpCode::LdMethodFld, superPropLoc, superLoc, cacheId); |
| |
| propFuncNode->sxFnc.pnodeName = nullptr; |
| } |
| |
| struct ByteCodeGenerator::TryScopeRecord : public JsUtil::DoublyLinkedListElement<TryScopeRecord> |
| { |
| Js::OpCode op; |
| Js::ByteCodeLabel label; |
| Js::RegSlot reg1; |
| Js::RegSlot reg2; |
| |
| TryScopeRecord(Js::OpCode op, Js::ByteCodeLabel label) : op(op), label(label), reg1(Js::Constants::NoRegister), reg2(Js::Constants::NoRegister) { } |
| TryScopeRecord(Js::OpCode op, Js::ByteCodeLabel label, Js::RegSlot r1, Js::RegSlot r2) : op(op), label(label), reg1(r1), reg2(r2) { } |
| }; |
| |
| void ByteCodeGenerator::EmitLeaveOpCodesBeforeYield() |
| { |
| for (TryScopeRecord* node = this->tryScopeRecordsList.Tail(); node != nullptr; node = node->Previous()) |
| { |
| switch (node->op) |
| { |
| case Js::OpCode::TryFinallyWithYield: |
| this->Writer()->Empty(Js::OpCode::LeaveNull); |
| break; |
| case Js::OpCode::TryCatch: |
| case Js::OpCode::ResumeFinally: |
| case Js::OpCode::ResumeCatch: |
| this->Writer()->Empty(Js::OpCode::Leave); |
| break; |
| default: |
| AssertMsg(false, "Unexpected OpCode before Yield in the Try-Catch-Finally cache for generator!"); |
| break; |
| } |
| } |
| } |
| |
| void ByteCodeGenerator::EmitTryBlockHeadersAfterYield() |
| { |
| for (TryScopeRecord* node = this->tryScopeRecordsList.Head(); node != nullptr; node = node->Next()) |
| { |
| switch (node->op) |
| { |
| case Js::OpCode::TryCatch: |
| this->Writer()->Br(node->op, node->label); |
| break; |
| case Js::OpCode::TryFinallyWithYield: |
| case Js::OpCode::ResumeFinally: |
| this->Writer()->BrReg2(node->op, node->label, node->reg1, node->reg2); |
| break; |
| case Js::OpCode::ResumeCatch: |
| this->Writer()->Empty(node->op); |
| break; |
| default: |
| AssertMsg(false, "Unexpected OpCode after yield in the Try-Catch-Finally cache for generator!"); |
| break; |
| } |
| } |
| } |
| |
| void EmitYield(Js::RegSlot inputLocation, Js::RegSlot resultLocation, ByteCodeGenerator* byteCodeGenerator, FuncInfo* funcInfo, |
| Js::RegSlot yieldStarIterator = Js::Constants::NoRegister) |
| { |
| // If the bytecode emitted by this function is part of 'yield*', inputLocation is the object |
| // returned by the iterable's next/return/throw method. Otherwise, it is the yielded value. |
| if (yieldStarIterator == Js::Constants::NoRegister) |
| { |
| byteCodeGenerator->Writer()->Reg1(Js::OpCode::NewScObjectSimple, funcInfo->yieldRegister); |
| |
| uint cacheId = funcInfo->FindOrAddInlineCacheId(funcInfo->yieldRegister, Js::PropertyIds::value, false, true); |
| byteCodeGenerator->Writer()->PatchableProperty(Js::OpCode::StFld, inputLocation, funcInfo->yieldRegister, cacheId); |
| |
| cacheId = funcInfo->FindOrAddInlineCacheId(funcInfo->yieldRegister, Js::PropertyIds::done, false, true); |
| byteCodeGenerator->Writer()->PatchableProperty(Js::OpCode::StFld, funcInfo->falseConstantRegister, funcInfo->yieldRegister, cacheId); |
| } |
| else |
| { |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::Ld_A, funcInfo->yieldRegister, inputLocation); |
| } |
| |
| byteCodeGenerator->EmitLeaveOpCodesBeforeYield(); |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::Yield, funcInfo->yieldRegister, funcInfo->yieldRegister); |
| byteCodeGenerator->EmitTryBlockHeadersAfterYield(); |
| |
| if (yieldStarIterator == Js::Constants::NoRegister) |
| { |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::ResumeYield, resultLocation, funcInfo->yieldRegister); |
| } |
| else |
| { |
| byteCodeGenerator->Writer()->Reg3(Js::OpCode::ResumeYieldStar, resultLocation, funcInfo->yieldRegister, yieldStarIterator); |
| } |
| } |
| |
| void EmitYieldStar(ParseNode* yieldStarNode, ByteCodeGenerator* byteCodeGenerator, FuncInfo* funcInfo) |
| { |
| funcInfo->AcquireLoc(yieldStarNode); |
| |
| Js::ByteCodeLabel loopEntrance = byteCodeGenerator->Writer()->DefineLabel(); |
| Js::ByteCodeLabel continuePastLoop = byteCodeGenerator->Writer()->DefineLabel(); |
| |
| Js::RegSlot iteratorLocation = funcInfo->AcquireTmpRegister(); |
| |
| // Evaluate operand |
| Emit(yieldStarNode->sxUni.pnode1, byteCodeGenerator, funcInfo, false); |
| funcInfo->ReleaseLoc(yieldStarNode->sxUni.pnode1); |
| |
| EmitGetIterator(iteratorLocation, yieldStarNode->sxUni.pnode1->location, byteCodeGenerator, funcInfo); |
| |
| // Call the iterator's next() |
| EmitIteratorNext(yieldStarNode->location, iteratorLocation, funcInfo->undefinedConstantRegister, byteCodeGenerator, funcInfo); |
| |
| uint loopId = byteCodeGenerator->Writer()->EnterLoop(loopEntrance); |
| // since a yield* doesn't have a user defined body, we cannot return from this loop |
| // which means we don't need to support EmitJumpCleanup() and there do not need to |
| // remember the loopId like the loop statements do. |
| |
| Js::RegSlot doneLocation = funcInfo->AcquireTmpRegister(); |
| EmitIteratorComplete(doneLocation, yieldStarNode->location, byteCodeGenerator, funcInfo); |
| |
| // branch past the loop if the done property is truthy |
| byteCodeGenerator->Writer()->BrReg1(Js::OpCode::BrTrue_A, continuePastLoop, doneLocation); |
| funcInfo->ReleaseTmpRegister(doneLocation); |
| |
| EmitYield(yieldStarNode->location, yieldStarNode->location, byteCodeGenerator, funcInfo, iteratorLocation); |
| |
| funcInfo->ReleaseTmpRegister(iteratorLocation); |
| |
| byteCodeGenerator->Writer()->Br(loopEntrance); |
| byteCodeGenerator->Writer()->MarkLabel(continuePastLoop); |
| byteCodeGenerator->Writer()->ExitLoop(loopId); |
| |
| // Put the iterator result's value in yieldStarNode->location. |
| // It will be used as the result value of the yield* operator expression. |
| EmitIteratorValue(yieldStarNode->location, yieldStarNode->location, byteCodeGenerator, funcInfo); |
| } |
| |
| void TrackIntConstantsOnGlobalUserObject(ByteCodeGenerator *byteCodeGenerator, bool isSymGlobalAndSingleAssignment, Js::PropertyId propertyId) |
| { |
| if (isSymGlobalAndSingleAssignment) |
| { |
| byteCodeGenerator->GetScriptContext()->TrackIntConstPropertyOnGlobalUserObject(propertyId); |
| } |
| } |
| |
| void TrackIntConstantsOnGlobalObject(ByteCodeGenerator *byteCodeGenerator, bool isSymGlobalAndSingleAssignment, Js::PropertyId propertyId) |
| { |
| if (isSymGlobalAndSingleAssignment) |
| { |
| byteCodeGenerator->GetScriptContext()->TrackIntConstPropertyOnGlobalObject(propertyId); |
| } |
| } |
| |
| void TrackIntConstantsOnGlobalObject(ByteCodeGenerator *byteCodeGenerator, Symbol *sym) |
| { |
| if (sym && sym->GetIsGlobal() && sym->IsAssignedOnce()) |
| { |
| Js::PropertyId propertyId = sym->EnsurePosition(byteCodeGenerator); |
| byteCodeGenerator->GetScriptContext()->TrackIntConstPropertyOnGlobalObject(propertyId); |
| } |
| } |
| |
| void TrackMemberNodesInObjectForIntConstants(ByteCodeGenerator *byteCodeGenerator, ParseNodePtr objNode) |
| { |
| Assert(objNode->nop == knopObject); |
| Assert(ParseNode::Grfnop(objNode->nop) & fnopUni); |
| |
| ParseNodePtr memberList = objNode->sxUni.pnode1; |
| |
| while (memberList != nullptr) |
| { |
| ParseNodePtr memberNode = memberList->nop == knopList ? memberList->sxBin.pnode1 : memberList; |
| ParseNodePtr memberNameNode = memberNode->sxBin.pnode1; |
| ParseNodePtr memberValNode = memberNode->sxBin.pnode2; |
| |
| if (memberNameNode->nop != knopComputedName && memberValNode->nop == knopInt) |
| { |
| Js::PropertyId propertyId = memberNameNode->sxPid.PropertyIdFromNameNode(); |
| TrackIntConstantsOnGlobalUserObject(byteCodeGenerator, true, propertyId); |
| } |
| |
| memberList = memberList->nop == knopList ? memberList->sxBin.pnode2 : nullptr; |
| } |
| } |
| |
| void TrackGlobalIntAssignmentsForknopDotProps(ParseNodePtr knopDotNode, ByteCodeGenerator * byteCodeGenerator) |
| { |
| Assert(knopDotNode->nop == knopDot); |
| |
| ParseNodePtr objectNode = knopDotNode->sxBin.pnode1; |
| ParseNodePtr propertyNode = knopDotNode->sxBin.pnode2; |
| bool isSymGlobalAndSingleAssignment = false; |
| |
| if (objectNode->nop == knopName) |
| { |
| Symbol * sym = objectNode->sxVar.sym; |
| isSymGlobalAndSingleAssignment = sym && sym->GetIsGlobal() && sym->IsAssignedOnce() && propertyNode->sxPid.pid->IsSingleAssignment(); |
| Js::PropertyId propertyId = propertyNode->sxPid.PropertyIdFromNameNode(); |
| TrackIntConstantsOnGlobalUserObject(byteCodeGenerator, isSymGlobalAndSingleAssignment, propertyId); |
| } |
| else if (objectNode->nop == knopThis) |
| { |
| // Assume knopThis always refer to GlobalObject |
| // Cases like "this.a = " |
| isSymGlobalAndSingleAssignment = propertyNode->sxPid.pid->IsSingleAssignment(); |
| Js::PropertyId propertyId = propertyNode->sxPid.PropertyIdFromNameNode(); |
| TrackIntConstantsOnGlobalObject(byteCodeGenerator, isSymGlobalAndSingleAssignment, propertyId); |
| } |
| } |
| |
| void TrackGlobalIntAssignments(ParseNodePtr pnode, ByteCodeGenerator * byteCodeGenerator) |
| { |
| // Track the Global Int Constant properties' assignments here. |
| uint nodeType = ParseNode::Grfnop(pnode->nop); |
| if (nodeType & fnopAsg) |
| { |
| if (nodeType & fnopBin) |
| { |
| ParseNodePtr lhs = pnode->sxBin.pnode1; |
| ParseNodePtr rhs = pnode->sxBin.pnode2; |
| |
| Assert(lhs && rhs); |
| |
| // Don't track other than integers and objects with member nodes. |
| if (rhs->nop == knopObject && (ParseNode::Grfnop(rhs->nop) & fnopUni)) |
| { |
| TrackMemberNodesInObjectForIntConstants(byteCodeGenerator, rhs); |
| } |
| else if (rhs->nop != knopInt && |
| ((rhs->nop != knopLsh && rhs->nop != knopRsh) || (rhs->sxBin.pnode1->nop != knopInt || rhs->sxBin.pnode2->nop != knopInt))) |
| { |
| return; |
| } |
| |
| if (lhs->nop == knopName) |
| { |
| // Handle "a = <Integer>" cases here |
| Symbol * sym = lhs->sxVar.sym; |
| TrackIntConstantsOnGlobalObject(byteCodeGenerator, sym); |
| } |
| else if (lhs->nop == knopDot && lhs->sxBin.pnode2->nop == knopName) |
| { |
| // Cases like "obj.a = <Integer>" |
| TrackGlobalIntAssignmentsForknopDotProps(lhs, byteCodeGenerator); |
| } |
| } |
| else if (nodeType & fnopUni) |
| { |
| ParseNodePtr lhs = pnode->sxUni.pnode1; |
| |
| if (lhs->nop == knopName) |
| { |
| // Cases like "a++" |
| Symbol * sym = lhs->sxVar.sym; |
| TrackIntConstantsOnGlobalObject(byteCodeGenerator, sym); |
| } |
| else if (lhs->nop == knopDot && lhs->sxBin.pnode2->nop == knopName) |
| { |
| // Cases like "obj.a++" |
| TrackGlobalIntAssignmentsForknopDotProps(lhs, byteCodeGenerator); |
| } |
| } |
| } |
| } |
| |
| void Emit(ParseNode *pnode, ByteCodeGenerator *byteCodeGenerator, FuncInfo *funcInfo, BOOL fReturnValue, bool isConstructorCall, ParseNode * bindPnode, bool isTopLevel) |
| { |
| if (pnode == nullptr) |
| { |
| return; |
| } |
| |
| ThreadContext::ProbeCurrentStackNoDispose(Js::Constants::MinStackByteCodeVisitor, byteCodeGenerator->GetScriptContext()); |
| |
| TrackGlobalIntAssignments(pnode, byteCodeGenerator); |
| |
| // printNop(pnode->nop); |
| switch (pnode->nop) |
| { |
| case knopList: |
| EmitList(pnode, byteCodeGenerator, funcInfo); |
| break; |
| case knopInt: |
| // currently, these are loaded at the top |
| break; |
| // PTNODE(knopFlt , "flt const" ,None ,Flt ,fnopLeaf|fnopConst) |
| case knopFlt: |
| // currently, these are loaded at the top |
| break; |
| // PTNODE(knopStr , "str const" ,None ,Pid ,fnopLeaf|fnopConst) |
| case knopStr: |
| // TODO: protocol for combining string constants |
| break; |
| // PTNODE(knopRegExp , "reg expr" ,None ,Pid ,fnopLeaf|fnopConst) |
| case knopRegExp: |
| funcInfo->GetParsedFunctionBody()->SetLiteralRegex(pnode->sxPid.regexPatternIndex, pnode->sxPid.regexPattern); |
| byteCodeGenerator->Writer()->Reg1Unsigned1(Js::OpCode::NewRegEx, funcInfo->AcquireLoc(pnode), pnode->sxPid.regexPatternIndex); |
| break; // PTNODE(knopThis , "this" ,None ,None ,fnopLeaf) |
| case knopThis: |
| // enregistered |
| // Try to load 'this' from a scope slot if we are in a derived class constructor with scope slots. Otherwise, this is a nop. |
| byteCodeGenerator->EmitScopeSlotLoadThis(funcInfo, funcInfo->thisPointerRegister); |
| break; |
| // PTNODE(knopNewTarget , "new.target" ,None , None , fnopLeaf) |
| case knopNewTarget: |
| break; |
| // PTNODE(knopSuper , "super" ,None , None , fnopLeaf) |
| case knopSuper: |
| if (!funcInfo->IsClassMember()) |
| { |
| FuncInfo* nonLambdaFunc = funcInfo; |
| if (funcInfo->IsLambda()) |
| { |
| nonLambdaFunc = byteCodeGenerator->FindEnclosingNonLambda(); |
| } |
| |
| if (nonLambdaFunc->IsGlobalFunction()) |
| { |
| if ((byteCodeGenerator->GetFlags() & fscrEval)) |
| { |
| byteCodeGenerator->Writer()->Reg1(isConstructorCall ? Js::OpCode::ScopedLdSuperCtor : Js::OpCode::ScopedLdSuper, funcInfo->AcquireLoc(pnode)); |
| } |
| else |
| { |
| byteCodeGenerator->Writer()->W1(Js::OpCode::RuntimeReferenceError, SCODE_CODE(JSERR_BadSuperReference)); |
| } |
| } |
| else |
| { |
| Js::ByteCodeLabel errLabel = byteCodeGenerator->Writer()->DefineLabel(); |
| Js::ByteCodeLabel skipLabel = byteCodeGenerator->Writer()->DefineLabel(); |
| byteCodeGenerator->Writer()->BrReg2(Js::OpCode::BrEq_A, errLabel, funcInfo->superRegister, funcInfo->undefinedConstantRegister); |
| byteCodeGenerator->Writer()->Br(Js::OpCode::Br, skipLabel); |
| byteCodeGenerator->Writer()->MarkLabel(errLabel); |
| byteCodeGenerator->Writer()->W1(Js::OpCode::RuntimeReferenceError, SCODE_CODE(JSERR_BadSuperReference)); |
| byteCodeGenerator->Writer()->MarkLabel(skipLabel); |
| } |
| } |
| break; |
| // PTNODE(knopNull , "null" ,Null ,None ,fnopLeaf) |
| case knopNull: |
| // enregistered |
| break; |
| // PTNODE(knopFalse , "false" ,False ,None ,fnopLeaf) |
| case knopFalse: |
| // enregistered |
| break; |
| // PTNODE(knopTrue , "true" ,True ,None ,fnopLeaf) |
| case knopTrue: |
| // enregistered |
| break; |
| // PTNODE(knopEmpty , "empty" ,Empty ,None ,fnopLeaf) |
| case knopEmpty: |
| break; |
| // Unary operators. |
| // PTNODE(knopNot , "~" ,BitNot ,Uni ,fnopUni) |
| case knopNot: |
| STARTSTATEMENET_IFTOPLEVEL(isTopLevel, pnode); |
| Emit(pnode->sxUni.pnode1, byteCodeGenerator, funcInfo, false); |
| funcInfo->ReleaseLoc(pnode->sxUni.pnode1); |
| byteCodeGenerator->Writer()->Reg2( |
| Js::OpCode::Not_A, funcInfo->AcquireLoc(pnode), pnode->sxUni.pnode1->location); |
| ENDSTATEMENET_IFTOPLEVEL(isTopLevel, pnode); |
| break; |
| // PTNODE(knopNeg , "unary -" ,Neg ,Uni ,fnopUni) |
| case knopNeg: |
| STARTSTATEMENET_IFTOPLEVEL(isTopLevel, pnode); |
| Emit(pnode->sxUni.pnode1, byteCodeGenerator, funcInfo, false); |
| funcInfo->ReleaseLoc(pnode->sxUni.pnode1); |
| funcInfo->AcquireLoc(pnode); |
| byteCodeGenerator->Writer()->Reg2( |
| Js::OpCode::Neg_A, pnode->location, pnode->sxUni.pnode1->location); |
| ENDSTATEMENET_IFTOPLEVEL(isTopLevel, pnode); |
| break; |
| // PTNODE(knopPos , "unary +" ,Pos ,Uni ,fnopUni) |
| case knopPos: |
| STARTSTATEMENET_IFTOPLEVEL(isTopLevel, pnode); |
| Emit(pnode->sxUni.pnode1, byteCodeGenerator, funcInfo, false); |
| funcInfo->ReleaseLoc(pnode->sxUni.pnode1); |
| byteCodeGenerator->Writer()->Reg2( |
| Js::OpCode::Conv_Num, funcInfo->AcquireLoc(pnode), pnode->sxUni.pnode1->location); |
| ENDSTATEMENET_IFTOPLEVEL(isTopLevel, pnode); |
| break; |
| // PTNODE(knopLogNot , "!" ,LogNot ,Uni ,fnopUni) |
| case knopLogNot: |
| { |
| STARTSTATEMENET_IFTOPLEVEL(isTopLevel, pnode); |
| Js::ByteCodeLabel doneLabel = byteCodeGenerator->Writer()->DefineLabel(); |
| // For boolean expressions that compute a result, we have to burn a register for the result |
| // so that the back end can identify it cheaply as a single temp lifetime. Revisit this if we do |
| // full-on renaming in the back end. |
| funcInfo->AcquireLoc(pnode); |
| if (pnode->sxUni.pnode1->nop == knopInt) |
| { |
| long value = pnode->sxUni.pnode1->sxInt.lw; |
| Js::OpCode op = value ? Js::OpCode::LdFalse : Js::OpCode::LdTrue; |
| byteCodeGenerator->Writer()->Reg1(op, pnode->location); |
| } |
| else |
| { |
| Emit(pnode->sxUni.pnode1, byteCodeGenerator, funcInfo, false); |
| byteCodeGenerator->Writer()->Reg1(Js::OpCode::LdFalse, pnode->location); |
| byteCodeGenerator->Writer()->BrReg1(Js::OpCode::BrTrue_A, doneLabel, pnode->sxUni.pnode1->location); |
| byteCodeGenerator->Writer()->Reg1(Js::OpCode::LdTrue, pnode->location); |
| byteCodeGenerator->Writer()->MarkLabel(doneLabel); |
| } |
| funcInfo->ReleaseLoc(pnode->sxUni.pnode1); |
| ENDSTATEMENET_IFTOPLEVEL(isTopLevel, pnode); |
| break; |
| } |
| // PTNODE(knopEllipsis , "..." ,Spread ,Uni , fnopUni) |
| case knopEllipsis: |
| { |
| Emit(pnode->sxUni.pnode1, byteCodeGenerator, funcInfo, false); |
| // Transparently pass the location of the array. |
| pnode->location = pnode->sxUni.pnode1->location; |
| break; |
| } |
| // PTNODE(knopIncPost , "post++" ,Inc ,Uni ,fnopUni|fnopAsg) |
| case knopIncPost: |
| case knopDecPost: |
| // FALL THROUGH to the faster pre-inc/dec case if the result of the expression is not needed. |
| if (pnode->isUsed || fReturnValue) |
| { |
| byteCodeGenerator->StartStatement(pnode); |
| Js::OpCode op = Js::OpCode::Add_A; |
| if (pnode->nop == knopDecPost) |
| { |
| op = Js::OpCode::Sub_A; |
| } |
| // Grab a register for the expression result. |
| funcInfo->AcquireLoc(pnode); |
| |
| // Load the initial value, convert it (this is the expression result), and increment it. |
| EmitLoad(pnode->sxUni.pnode1, byteCodeGenerator, funcInfo); |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::Conv_Num, pnode->location, pnode->sxUni.pnode1->location); |
| |
| Js::RegSlot incDecResult = pnode->sxUni.pnode1->location; |
| if (funcInfo->RegIsConst(incDecResult)) |
| { |
| // Avoid letting the add/sub overwrite a constant reg, as this may actually change the |
| // contents of the constant table. |
| incDecResult = funcInfo->AcquireTmpRegister(); |
| } |
| |
| Js::RegSlot oneReg = funcInfo->constantToRegister.LookupWithKey(1, Js::Constants::NoRegister); |
| Assert(oneReg != Js::Constants::NoRegister); |
| byteCodeGenerator->Writer()->Reg3(op, incDecResult, pnode->location, oneReg); |
| |
| // Store the incremented value. |
| EmitAssignment(nullptr, pnode->sxUni.pnode1, incDecResult, byteCodeGenerator, funcInfo); |
| |
| // Release the incremented value and the l-value. |
| if (incDecResult != pnode->sxUni.pnode1->location) |
| { |
| funcInfo->ReleaseTmpRegister(incDecResult); |
| } |
| funcInfo->ReleaseLoad(pnode->sxUni.pnode1); |
| byteCodeGenerator->EndStatement(pnode); |
| |
| break; |
| } |
| else |
| { |
| pnode->nop = (pnode->nop == knopIncPost) ? knopIncPre : knopDecPre; |
| } |
| // FALL THROUGH to the fast pre-inc/dec case if the result of the expression is not needed. |
| |
| // PTNODE(knopIncPre , "++ pre" ,Inc ,Uni ,fnopUni|fnopAsg) |
| case knopIncPre: |
| case knopDecPre: |
| { |
| byteCodeGenerator->StartStatement(pnode); |
| Js::OpCode op = Js::OpCode::Incr_A; |
| if (pnode->nop == knopDecPre) |
| { |
| op = Js::OpCode::Decr_A; |
| } |
| |
| // Assign a register for the result only if the result is used or the operand can't be assigned to |
| // (i.e., is a constant). |
| if (pnode->isUsed || fReturnValue) |
| { |
| funcInfo->AcquireLoc(pnode); |
| |
| // Load the initial value and increment it (this is the expression result). |
| EmitLoad(pnode->sxUni.pnode1, byteCodeGenerator, funcInfo); |
| byteCodeGenerator->Writer()->Reg2(op, pnode->location, pnode->sxUni.pnode1->location); |
| |
| // Store the incremented value and release the l-value. |
| EmitAssignment(nullptr, pnode->sxUni.pnode1, pnode->location, byteCodeGenerator, funcInfo); |
| funcInfo->ReleaseLoad(pnode->sxUni.pnode1); |
| } |
| else |
| { |
| // Load the initial value and increment it (this is the expression result). |
| EmitLoad(pnode->sxUni.pnode1, byteCodeGenerator, funcInfo); |
| |
| Js::RegSlot incDecResult = pnode->sxUni.pnode1->location; |
| if (funcInfo->RegIsConst(incDecResult)) |
| { |
| // Avoid letting the add/sub overwrite a constant reg, as this may actually change the |
| // contents of the constant table. |
| incDecResult = funcInfo->AcquireTmpRegister(); |
| } |
| |
| byteCodeGenerator->Writer()->Reg2(op, incDecResult, pnode->sxUni.pnode1->location); |
| |
| // Store the incremented value and release the l-value. |
| EmitAssignment(nullptr, pnode->sxUni.pnode1, incDecResult, byteCodeGenerator, funcInfo); |
| if (incDecResult != pnode->sxUni.pnode1->location) |
| { |
| funcInfo->ReleaseTmpRegister(incDecResult); |
| } |
| funcInfo->ReleaseLoad(pnode->sxUni.pnode1); |
| } |
| |
| byteCodeGenerator->EndStatement(pnode); |
| break; |
| } |
| // PTNODE(knopTypeof , "typeof" ,None ,Uni ,fnopUni) |
| case knopTypeof: |
| { |
| STARTSTATEMENET_IFTOPLEVEL(isTopLevel, pnode); |
| ParseNode* pnodeOpnd = pnode->sxUni.pnode1; |
| switch (pnodeOpnd->nop) |
| { |
| case knopDot: |
| { |
| Emit(pnodeOpnd->sxBin.pnode1, byteCodeGenerator, funcInfo, false); |
| Js::PropertyId propertyId = pnodeOpnd->sxBin.pnode2->sxPid.PropertyIdFromNameNode(); |
| Assert(pnodeOpnd->sxBin.pnode2->nop == knopName); |
| funcInfo->ReleaseLoc(pnodeOpnd->sxBin.pnode1); |
| funcInfo->AcquireLoc(pnode); |
| |
| byteCodeGenerator->EmitTypeOfFld(funcInfo, propertyId, pnode->location, pnodeOpnd->sxBin.pnode1->location, Js::OpCode::LdFldForTypeOf); |
| break; |
| } |
| |
| case knopIndex: |
| { |
| EmitBinaryOpnds(pnodeOpnd->sxBin.pnode1, pnodeOpnd->sxBin.pnode2, byteCodeGenerator, funcInfo); |
| funcInfo->ReleaseLoc(pnodeOpnd->sxBin.pnode2); |
| funcInfo->ReleaseLoc(pnodeOpnd->sxBin.pnode1); |
| funcInfo->AcquireLoc(pnode); |
| byteCodeGenerator->Writer()->Element(Js::OpCode::TypeofElem, pnode->location, pnodeOpnd->sxBin.pnode1->location, pnodeOpnd->sxBin.pnode2->location); |
| break; |
| } |
| case knopName: |
| { |
| funcInfo->AcquireLoc(pnode); |
| byteCodeGenerator->EmitPropTypeof(pnode->location, pnodeOpnd->sxPid.sym, pnodeOpnd->sxPid.pid, funcInfo); |
| break; |
| } |
| |
| default: |
| Emit(pnodeOpnd, byteCodeGenerator, funcInfo, false); |
| funcInfo->ReleaseLoc(pnodeOpnd); |
| byteCodeGenerator->Writer()->Reg2( |
| Js::OpCode::Typeof, funcInfo->AcquireLoc(pnode), pnodeOpnd->location); |
| break; |
| } |
| ENDSTATEMENET_IFTOPLEVEL(isTopLevel, pnode); |
| break; |
| } |
| // PTNODE(knopVoid , "void" ,Void ,Uni ,fnopUni) |
| case knopVoid: |
| Emit(pnode->sxUni.pnode1, byteCodeGenerator, funcInfo, false); |
| funcInfo->ReleaseLoc(pnode->sxUni.pnode1); |
| byteCodeGenerator->Writer()->Reg1(Js::OpCode::LdUndef, funcInfo->AcquireLoc(pnode)); |
| break; |
| // PTNODE(knopArray , "arr cnst" ,None ,Uni ,fnopUni) |
| case knopArray: |
| STARTSTATEMENET_IFTOPLEVEL(isTopLevel, pnode); |
| EmitArrayLiteral(pnode, byteCodeGenerator, funcInfo); |
| ENDSTATEMENET_IFTOPLEVEL(isTopLevel, pnode); |
| break; |
| // PTNODE(knopObject , "obj cnst" ,None ,Uni ,fnopUni) |
| case knopObject: |
| STARTSTATEMENET_IFTOPLEVEL(isTopLevel, pnode); |
| funcInfo->AcquireLoc(pnode); |
| EmitObjectInitializers(pnode->sxUni.pnode1, pnode->location, byteCodeGenerator, funcInfo); |
| ENDSTATEMENET_IFTOPLEVEL(isTopLevel, pnode); |
| break; |
| // PTNODE(knopComputedName, "[name]" ,None ,Uni ,fnopUni) |
| case knopComputedName: |
| Emit(pnode->sxUni.pnode1, byteCodeGenerator, funcInfo, false); |
| if (pnode->location == Js::Constants::NoRegister) |
| { |
| // The name is some expression with no home location. We can just re-use the register. |
| pnode->location = pnode->sxUni.pnode1->location; |
| } |
| else if (pnode->location != pnode->sxUni.pnode1->location) |
| { |
| // The name had to be protected from side-effects of the RHS. |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::Ld_A, pnode->location, pnode->sxUni.pnode1->location); |
| } |
| break; |
| // Binary and Ternary Operators |
| case knopAdd: |
| EmitAdd(pnode, byteCodeGenerator, funcInfo); |
| break; |
| case knopSub: |
| case knopMul: |
| case knopExpo: |
| case knopDiv: |
| case knopMod: |
| case knopOr: |
| case knopXor: |
| case knopAnd: |
| case knopLsh: |
| case knopRsh: |
| case knopRs2: |
| case knopIn: |
| EmitBinary(nopToOp[pnode->nop], pnode, byteCodeGenerator, funcInfo); |
| break; |
| case knopInstOf: |
| { |
| STARTSTATEMENET_IFTOPLEVEL(isTopLevel, pnode); |
| EmitBinaryOpnds(pnode->sxBin.pnode1, pnode->sxBin.pnode2, byteCodeGenerator, funcInfo); |
| funcInfo->ReleaseLoc(pnode->sxBin.pnode2); |
| funcInfo->ReleaseLoc(pnode->sxBin.pnode1); |
| funcInfo->AcquireLoc(pnode); |
| uint cacheId = funcInfo->NewIsInstInlineCache(); |
| byteCodeGenerator->Writer()->Reg3C(nopToOp[pnode->nop], pnode->location, pnode->sxBin.pnode1->location, |
| pnode->sxBin.pnode2->location, cacheId); |
| ENDSTATEMENET_IFTOPLEVEL(isTopLevel, pnode); |
| } |
| break; |
| case knopEq: |
| case knopEqv: |
| case knopNEqv: |
| case knopNe: |
| case knopLt: |
| case knopLe: |
| case knopGe: |
| case knopGt: |
| STARTSTATEMENET_IFTOPLEVEL(isTopLevel, pnode); |
| EmitBinaryOpnds(pnode->sxBin.pnode1, pnode->sxBin.pnode2, byteCodeGenerator, funcInfo); |
| funcInfo->ReleaseLoc(pnode->sxBin.pnode2); |
| funcInfo->ReleaseLoc(pnode->sxBin.pnode1); |
| funcInfo->AcquireLoc(pnode); |
| byteCodeGenerator->Writer()->Reg3(nopToCMOp[pnode->nop], pnode->location, pnode->sxBin.pnode1->location, |
| pnode->sxBin.pnode2->location); |
| ENDSTATEMENET_IFTOPLEVEL(isTopLevel, pnode); |
| break; |
| case knopNew: |
| { |
| Js::ArgSlot argCount = pnode->sxCall.argCount; |
| argCount++; // include "this" |
| |
| BOOL fSideEffectArgs = FALSE; |
| unsigned int tmpCount = CountArguments(pnode->sxCall.pnodeArgs, &fSideEffectArgs); |
| Assert(argCount == tmpCount); |
| |
| if (argCount != (Js::ArgSlot)argCount) |
| { |
| Js::Throw::OutOfMemory(); |
| } |
| |
| byteCodeGenerator->StartStatement(pnode); |
| |
| // Start call, allocate out param space |
| funcInfo->StartRecordingOutArgs(argCount); |
| |
| // Assign the call target operand(s), putting them into expression temps if necessary to protect |
| // them from side-effects. |
| if (fSideEffectArgs) |
| { |
| SaveOpndValue(pnode->sxCall.pnodeTarget, funcInfo); |
| } |
| |
| if (pnode->sxCall.pnodeTarget->nop == knopSuper) |
| { |
| EmitSuperFieldPatch(funcInfo, pnode, byteCodeGenerator); |
| } |
| |
| Emit(pnode->sxCall.pnodeTarget, byteCodeGenerator, funcInfo, false, true); |
| |
| if (pnode->sxCall.pnodeArgs == nullptr) |
| { |
| funcInfo->ReleaseLoc(pnode->sxCall.pnodeTarget); |
| Js::OpCode op = (CreateNativeArrays(byteCodeGenerator, funcInfo) |
| && CallTargetIsArray(pnode->sxCall.pnodeTarget)) |
| ? Js::OpCode::NewScObjArray : Js::OpCode::NewScObject; |
| Assert(argCount == 1); |
| |
| Js::ProfileId callSiteId = byteCodeGenerator->GetNextCallSiteId(op); |
| byteCodeGenerator->Writer()->StartCall(Js::OpCode::StartCall, argCount); |
| byteCodeGenerator->Writer()->CallI(op, funcInfo->AcquireLoc(pnode), |
| pnode->sxCall.pnodeTarget->location, argCount, callSiteId); |
| } |
| else |
| { |
| byteCodeGenerator->Writer()->StartCall(Js::OpCode::StartCall, argCount); |
| uint32 actualArgCount = 0; |
| |
| if (IsCallOfConstants(pnode)) |
| { |
| funcInfo->ReleaseLoc(pnode->sxCall.pnodeTarget); |
| actualArgCount = EmitNewObjectOfConstants(pnode, byteCodeGenerator, funcInfo, argCount); |
| } |
| else |
| { |
| Js::OpCode op; |
| if ((CreateNativeArrays(byteCodeGenerator, funcInfo) && CallTargetIsArray(pnode->sxCall.pnodeTarget))) |
| { |
| op = pnode->sxCall.spreadArgCount > 0 ? Js::OpCode::NewScObjArraySpread : Js::OpCode::NewScObjArray; |
| } |
| else |
| { |
| op = pnode->sxCall.spreadArgCount > 0 ? Js::OpCode::NewScObjectSpread : Js::OpCode::NewScObject; |
| } |
| |
| Js::ProfileId callSiteId = byteCodeGenerator->GetNextCallSiteId(op); |
| |
| |
| Js::AuxArray<uint32> *spreadIndices = nullptr; |
| actualArgCount = EmitArgList(pnode->sxCall.pnodeArgs, Js::Constants::NoRegister, Js::Constants::NoRegister, Js::Constants::NoRegister, |
| false, true, byteCodeGenerator, funcInfo, callSiteId, pnode->sxCall.spreadArgCount, &spreadIndices); |
| funcInfo->ReleaseLoc(pnode->sxCall.pnodeTarget); |
| |
| |
| if (pnode->sxCall.spreadArgCount > 0) |
| { |
| Assert(spreadIndices != nullptr); |
| uint spreadExtraAlloc = spreadIndices->count * sizeof(uint32); |
| uint spreadIndicesSize = sizeof(*spreadIndices) + spreadExtraAlloc; |
| byteCodeGenerator->Writer()->CallIExtended(op, funcInfo->AcquireLoc(pnode), pnode->sxCall.pnodeTarget->location, |
| (uint16)actualArgCount, Js::CallIExtended_SpreadArgs, |
| spreadIndices, spreadIndicesSize, callSiteId); |
| } |
| else |
| { |
| byteCodeGenerator->Writer()->CallI(op, funcInfo->AcquireLoc(pnode), pnode->sxCall.pnodeTarget->location, |
| (uint16)actualArgCount, callSiteId); |
| } |
| } |
| |
| Assert(argCount == actualArgCount); |
| } |
| |
| // End call, pop param space |
| funcInfo->EndRecordingOutArgs(argCount); |
| |
| byteCodeGenerator->EndStatement(pnode); |
| break; |
| } |
| case knopDelete: |
| { |
| ParseNode *pexpr = pnode->sxUni.pnode1; |
| byteCodeGenerator->StartStatement(pnode); |
| switch (pexpr->nop) |
| { |
| case knopName: |
| { |
| funcInfo->AcquireLoc(pnode); |
| byteCodeGenerator->EmitPropDelete(pnode->location, pexpr->sxPid.sym, pexpr->sxPid.pid, funcInfo); |
| break; |
| } |
| case knopDot: |
| { |
| Emit(pexpr->sxBin.pnode1, byteCodeGenerator, funcInfo, false); |
| Js::PropertyId propertyId = pexpr->sxBin.pnode2->sxPid.PropertyIdFromNameNode(); |
| funcInfo->ReleaseLoc(pexpr->sxBin.pnode1); |
| funcInfo->AcquireLoc(pnode); |
| byteCodeGenerator->Writer()->Property(Js::OpCode::DeleteFld, pnode->location, pexpr->sxBin.pnode1->location, |
| funcInfo->FindOrAddReferencedPropertyId(propertyId)); |
| break; |
| } |
| case knopIndex: |
| { |
| EmitBinaryOpnds(pexpr->sxBin.pnode1, pexpr->sxBin.pnode2, byteCodeGenerator, funcInfo); |
| funcInfo->ReleaseLoc(pexpr->sxBin.pnode2); |
| funcInfo->ReleaseLoc(pexpr->sxBin.pnode1); |
| funcInfo->AcquireLoc(pnode); |
| byteCodeGenerator->Writer()->Element(Js::OpCode::DeleteElemI_A, pnode->location, pexpr->sxBin.pnode1->location, pexpr->sxBin.pnode2->location); |
| break; |
| } |
| case knopThis: |
| { |
| funcInfo->AcquireLoc(pnode); |
| byteCodeGenerator->Writer()->Reg1(Js::OpCode::LdTrue, pnode->location); |
| break; |
| } |
| default: |
| { |
| Emit(pexpr, byteCodeGenerator, funcInfo, false); |
| funcInfo->ReleaseLoc(pexpr); |
| byteCodeGenerator->Writer()->Reg2( |
| Js::OpCode::Delete_A, funcInfo->AcquireLoc(pnode), pexpr->location); |
| break; |
| } |
| } |
| byteCodeGenerator->EndStatement(pnode); |
| break; |
| } |
| case knopCall: |
| { |
| byteCodeGenerator->StartStatement(pnode); |
| |
| if (pnode->sxCall.pnodeTarget->nop == knopSuper) |
| { |
| byteCodeGenerator->EmitSuperCall(funcInfo, pnode, fReturnValue); |
| } |
| else |
| { |
| if (pnode->sxCall.isApplyCall && funcInfo->GetApplyEnclosesArgs()) |
| { |
| // TODO[ianhall]: Can we remove the ApplyCall bytecode gen time optimization? |
| EmitApplyCall(pnode, Js::Constants::NoRegister, byteCodeGenerator, funcInfo, fReturnValue); |
| } |
| else |
| { |
| EmitCall(pnode, Js::Constants::NoRegister, byteCodeGenerator, funcInfo, fReturnValue, /*fEvaluateComponents*/ true, /*fHasNewTarget*/ false); |
| } |
| } |
| |
| byteCodeGenerator->EndStatement(pnode); |
| break; |
| } |
| case knopIndex: |
| { |
| STARTSTATEMENET_IFTOPLEVEL(isTopLevel, pnode); |
| EmitBinaryOpnds(pnode->sxBin.pnode1, pnode->sxBin.pnode2, byteCodeGenerator, funcInfo); |
| funcInfo->ReleaseLoc(pnode->sxBin.pnode2); |
| funcInfo->ReleaseLoc(pnode->sxBin.pnode1); |
| funcInfo->AcquireLoc(pnode); |
| |
| Js::RegSlot callObjLocation = pnode->sxBin.pnode1->location; |
| Js::RegSlot protoLocation = callObjLocation; |
| EmitSuperMethodBegin(pnode, byteCodeGenerator, funcInfo); |
| byteCodeGenerator->Writer()->Element( |
| Js::OpCode::LdElemI_A, pnode->location, protoLocation, pnode->sxBin.pnode2->location); |
| ENDSTATEMENET_IFTOPLEVEL(isTopLevel, pnode); |
| break; |
| } |
| // this is MemberExpression as rvalue |
| case knopDot: |
| { |
| Emit(pnode->sxBin.pnode1, byteCodeGenerator, funcInfo, false); |
| funcInfo->ReleaseLoc(pnode->sxBin.pnode1); |
| funcInfo->AcquireLoc(pnode); |
| Js::PropertyId propertyId = pnode->sxBin.pnode2->sxPid.PropertyIdFromNameNode(); |
| |
| Js::RegSlot callObjLocation = pnode->sxBin.pnode1->location; |
| Js::RegSlot protoLocation = callObjLocation; |
| EmitSuperMethodBegin(pnode, byteCodeGenerator, funcInfo); |
| |
| if (propertyId == Js::PropertyIds::length) |
| { |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::LdLen_A, pnode->location, protoLocation); |
| } |
| else |
| { |
| uint cacheId = funcInfo->FindOrAddInlineCacheId(callObjLocation, propertyId, false, false); |
| if (pnode->IsCallApplyTargetLoad()) |
| { |
| byteCodeGenerator->Writer()->PatchableProperty(Js::OpCode::LdFldForCallApplyTarget, pnode->location, protoLocation, cacheId); |
| } |
| else |
| { |
| if (pnode->sxBin.pnode1->nop == knopSuper) |
| { |
| byteCodeGenerator->Writer()->PatchablePropertyWithThisPtr(Js::OpCode::LdSuperFld, pnode->location, protoLocation, funcInfo->thisPointerRegister, cacheId, isConstructorCall); |
| } |
| else |
| { |
| byteCodeGenerator->Writer()->PatchableProperty(Js::OpCode::LdFld, pnode->location, callObjLocation, cacheId, isConstructorCall); |
| } |
| } |
| } |
| |
| break; |
| } |
| |
| // PTNODE(knopAsg , "=" ,None ,Bin ,fnopBin|fnopAsg) |
| case knopAsg: |
| { |
| ParseNode *lhs = pnode->sxBin.pnode1; |
| ParseNode *rhs = pnode->sxBin.pnode2; |
| byteCodeGenerator->StartStatement(pnode); |
| if (pnode->isUsed || fReturnValue) |
| { |
| // If the assignment result is used, grab a register to hold it and pass it to EmitAssignment, |
| // which will copy the assigned value there. |
| funcInfo->AcquireLoc(pnode); |
| EmitBinaryReference(lhs, rhs, byteCodeGenerator, funcInfo, false); |
| EmitAssignment(pnode, lhs, rhs->location, byteCodeGenerator, funcInfo); |
| } |
| else |
| { |
| EmitBinaryReference(lhs, rhs, byteCodeGenerator, funcInfo, false); |
| EmitAssignment(nullptr, lhs, rhs->location, byteCodeGenerator, funcInfo); |
| } |
| funcInfo->ReleaseLoc(rhs); |
| if (!(byteCodeGenerator->IsES6DestructuringEnabled() && (lhs->IsPattern()))) |
| { |
| funcInfo->ReleaseReference(lhs); |
| } |
| byteCodeGenerator->EndStatement(pnode); |
| break; |
| } |
| |
| case knopName: |
| funcInfo->AcquireLoc(pnode); |
| byteCodeGenerator->EmitPropLoad(pnode->location, pnode->sxPid.sym, pnode->sxPid.pid, funcInfo); |
| break; |
| |
| case knopComma: |
| { |
| STARTSTATEMENET_IFTOPLEVEL(isTopLevel, pnode); |
| // The parser marks binary opnd pnodes as used, but value of the first opnd of a comma is not used. |
| // Easier to correct this here than to check every binary op in the parser. |
| ParseNode *pnode1 = pnode->sxBin.pnode1; |
| pnode1->isUsed = false; |
| if (pnode1->nop == knopComma) |
| { |
| // Spot fix for giant comma expressions that send us into OOS if we use a simple recursive |
| // algorithm. Instead of recursing on comma LHS's, iterate over them, pushing the RHS's onto |
| // a stack. (This suggests a model for removing recursion from Emit altogether...) |
| ArenaAllocator *alloc = byteCodeGenerator->GetAllocator(); |
| SList<ParseNode *> rhsStack(alloc); |
| do |
| { |
| rhsStack.Push(pnode1->sxBin.pnode2); |
| pnode1 = pnode1->sxBin.pnode1; |
| pnode1->isUsed = false; |
| } |
| while (pnode1->nop == knopComma); |
| |
| Emit(pnode1, byteCodeGenerator, funcInfo, false); |
| if (funcInfo->IsTmpReg(pnode1->location)) |
| { |
| byteCodeGenerator->Writer()->Reg1(Js::OpCode::Unused, pnode1->location); |
| } |
| |
| while (!rhsStack.Empty()) |
| { |
| ParseNode *pnodeRhs = rhsStack.Pop(); |
| pnodeRhs->isUsed = false; |
| Emit(pnodeRhs, byteCodeGenerator, funcInfo, false); |
| if (funcInfo->IsTmpReg(pnodeRhs->location)) |
| { |
| byteCodeGenerator->Writer()->Reg1(Js::OpCode::Unused, pnodeRhs->location); |
| } |
| funcInfo->ReleaseLoc(pnodeRhs); |
| } |
| } |
| else |
| { |
| Emit(pnode1, byteCodeGenerator, funcInfo, false); |
| if (funcInfo->IsTmpReg(pnode1->location)) |
| { |
| byteCodeGenerator->Writer()->Reg1(Js::OpCode::Unused, pnode1->location); |
| } |
| } |
| funcInfo->ReleaseLoc(pnode1); |
| |
| pnode->sxBin.pnode2->isUsed = pnode->isUsed || fReturnValue; |
| Emit(pnode->sxBin.pnode2, byteCodeGenerator, funcInfo, false); |
| funcInfo->ReleaseLoc(pnode->sxBin.pnode2); |
| funcInfo->AcquireLoc(pnode); |
| if (pnode->sxBin.pnode2->isUsed && pnode->location != pnode->sxBin.pnode2->location) |
| { |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::Ld_A, pnode->location, pnode->sxBin.pnode2->location); |
| } |
| ENDSTATEMENET_IFTOPLEVEL(isTopLevel, pnode); |
| } |
| break; |
| |
| // The binary logical ops && and || resolve to the value of the left-hand expression if its |
| // boolean value short-circuits the operation, and to the value of the right-hand expression |
| // otherwise. (In other words, the "truth" of the right-hand expression is never tested.) |
| // PTNODE(knopLogOr , "||" ,None ,Bin ,fnopBin) |
| case knopLogOr: |
| { |
| STARTSTATEMENET_IFTOPLEVEL(isTopLevel, pnode); |
| Js::ByteCodeLabel doneLabel = byteCodeGenerator->Writer()->DefineLabel(); |
| // For boolean expressions that compute a result, we have to burn a register for the result |
| // so that the back end can identify it cheaply as a single temp lifetime. Revisit this if we do |
| // full-on renaming in the back end. |
| funcInfo->AcquireLoc(pnode); |
| |
| Emit(pnode->sxBin.pnode1, byteCodeGenerator, funcInfo, false); |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::Ld_A, pnode->location, pnode->sxBin.pnode1->location); |
| byteCodeGenerator->Writer()->BrReg1(Js::OpCode::BrTrue_A, doneLabel, pnode->sxBin.pnode1->location); |
| funcInfo->ReleaseLoc(pnode->sxBin.pnode1); |
| |
| Emit(pnode->sxBin.pnode2, byteCodeGenerator, funcInfo, false); |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::Ld_A, pnode->location, pnode->sxBin.pnode2->location); |
| funcInfo->ReleaseLoc(pnode->sxBin.pnode2); |
| byteCodeGenerator->Writer()->MarkLabel(doneLabel); |
| ENDSTATEMENET_IFTOPLEVEL(isTopLevel, pnode); |
| break; |
| } |
| // PTNODE(knopLogAnd , "&&" ,None ,Bin ,fnopBin) |
| case knopLogAnd: |
| { |
| STARTSTATEMENET_IFTOPLEVEL(isTopLevel, pnode); |
| Js::ByteCodeLabel doneLabel = byteCodeGenerator->Writer()->DefineLabel(); |
| // For boolean expressions that compute a result, we have to burn a register for the result |
| // so that the back end can identify it cheaply as a single temp lifetime. Revisit this if we do |
| // full-on renaming in the back end. |
| funcInfo->AcquireLoc(pnode); |
| |
| Emit(pnode->sxBin.pnode1, byteCodeGenerator, funcInfo, false); |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::Ld_A, pnode->location, pnode->sxBin.pnode1->location); |
| byteCodeGenerator->Writer()->BrReg1(Js::OpCode::BrFalse_A, doneLabel, pnode->sxBin.pnode1->location); |
| funcInfo->ReleaseLoc(pnode->sxBin.pnode1); |
| |
| Emit(pnode->sxBin.pnode2, byteCodeGenerator, funcInfo, false); |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::Ld_A, pnode->location, pnode->sxBin.pnode2->location); |
| funcInfo->ReleaseLoc(pnode->sxBin.pnode2); |
| byteCodeGenerator->Writer()->MarkLabel(doneLabel); |
| ENDSTATEMENET_IFTOPLEVEL(isTopLevel, pnode); |
| break; |
| } |
| // PTNODE(knopQmark , "?" ,None ,Tri ,fnopBin) |
| case knopQmark: |
| { |
| Js::ByteCodeLabel trueLabel = byteCodeGenerator->Writer()->DefineLabel(); |
| Js::ByteCodeLabel falseLabel = byteCodeGenerator->Writer()->DefineLabel(); |
| Js::ByteCodeLabel skipLabel = byteCodeGenerator->Writer()->DefineLabel(); |
| EmitBooleanExpression(pnode->sxTri.pnode1, trueLabel, falseLabel, byteCodeGenerator, funcInfo); |
| byteCodeGenerator->Writer()->MarkLabel(trueLabel); |
| funcInfo->ReleaseLoc(pnode->sxTri.pnode1); |
| |
| // For boolean expressions that compute a result, we have to burn a register for the result |
| // so that the back end can identify it cheaply as a single temp lifetime. Revisit this if we do |
| // full-on renaming in the back end. |
| funcInfo->AcquireLoc(pnode); |
| |
| Emit(pnode->sxTri.pnode2, byteCodeGenerator, funcInfo, false); |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::Ld_A, pnode->location, pnode->sxTri.pnode2->location); |
| funcInfo->ReleaseLoc(pnode->sxTri.pnode2); |
| |
| // Record the branch bytecode offset |
| byteCodeGenerator->Writer()->RecordStatementAdjustment(Js::FunctionBody::SAT_FromCurrentToNext); |
| |
| byteCodeGenerator->Writer()->Br(skipLabel); |
| |
| byteCodeGenerator->Writer()->MarkLabel(falseLabel); |
| Emit(pnode->sxTri.pnode3, byteCodeGenerator, funcInfo, false); |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::Ld_A, pnode->location, pnode->sxTri.pnode3->location); |
| funcInfo->ReleaseLoc(pnode->sxTri.pnode3); |
| |
| byteCodeGenerator->Writer()->MarkLabel(skipLabel); |
| |
| break; |
| } |
| |
| case knopAsgAdd: |
| case knopAsgSub: |
| case knopAsgMul: |
| case knopAsgDiv: |
| case knopAsgExpo: |
| case knopAsgMod: |
| case knopAsgAnd: |
| case knopAsgXor: |
| case knopAsgOr: |
| case knopAsgLsh: |
| case knopAsgRsh: |
| case knopAsgRs2: |
| byteCodeGenerator->StartStatement(pnode); |
| // Assign a register for the result only if the result is used or the LHS can't be assigned to |
| // (i.e., is a constant). |
| if (pnode->isUsed || fReturnValue || funcInfo->RegIsConst(pnode->sxBin.pnode1->location)) |
| { |
| // If the assign-op result is used, grab a register to hold it. |
| funcInfo->AcquireLoc(pnode); |
| |
| // Grab a register for the initial value and load it. |
| EmitBinaryReference(pnode->sxBin.pnode1, pnode->sxBin.pnode2, byteCodeGenerator, funcInfo, true); |
| funcInfo->ReleaseLoc(pnode->sxBin.pnode2); |
| // Do the arithmetic, store the result, and release the l-value. |
| byteCodeGenerator->Writer()->Reg3(nopToOp[pnode->nop], pnode->location, pnode->sxBin.pnode1->location, |
| pnode->sxBin.pnode2->location); |
| |
| EmitAssignment(pnode, pnode->sxBin.pnode1, pnode->location, byteCodeGenerator, funcInfo); |
| } |
| else |
| { |
| // Grab a register for the initial value and load it. |
| EmitBinaryReference(pnode->sxBin.pnode1, pnode->sxBin.pnode2, byteCodeGenerator, funcInfo, true); |
| funcInfo->ReleaseLoc(pnode->sxBin.pnode2); |
| // Do the arithmetic, store the result, and release the l-value. |
| byteCodeGenerator->Writer()->Reg3(nopToOp[pnode->nop], pnode->sxBin.pnode1->location, pnode->sxBin.pnode1->location, |
| pnode->sxBin.pnode2->location); |
| EmitAssignment(nullptr, pnode->sxBin.pnode1, pnode->sxBin.pnode1->location, byteCodeGenerator, funcInfo); |
| } |
| funcInfo->ReleaseLoad(pnode->sxBin.pnode1); |
| |
| byteCodeGenerator->EndStatement(pnode); |
| break; |
| |
| // General nodes. |
| // PTNODE(knopTempRef , "temp ref" ,None ,Uni ,fnopUni) |
| case knopTempRef: |
| // TODO: check whether mov is necessary |
| funcInfo->AcquireLoc(pnode); |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::Ld_A, pnode->location, pnode->sxUni.pnode1->location); |
| break; |
| // PTNODE(knopTemp , "temp" ,None ,None ,fnopLeaf) |
| case knopTemp: |
| // Emit initialization code |
| if (pnode->sxVar.pnodeInit != nullptr) |
| { |
| byteCodeGenerator->StartStatement(pnode); |
| Emit(pnode->sxVar.pnodeInit, byteCodeGenerator, funcInfo, false); |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::Ld_A, pnode->location, pnode->sxVar.pnodeInit->location); |
| funcInfo->ReleaseLoc(pnode->sxVar.pnodeInit); |
| byteCodeGenerator->EndStatement(pnode); |
| } |
| break; |
| // PTNODE(knopVarDecl , "varDcl" ,None ,Var ,fnopNone) |
| case knopVarDecl: |
| case knopConstDecl: |
| case knopLetDecl: |
| { |
| // Emit initialization code |
| ParseNodePtr initNode = pnode->sxVar.pnodeInit; |
| AssertMsg(pnode->nop != knopConstDecl || initNode != nullptr, "knopConstDecl expected to have an initializer"); |
| |
| if (initNode != nullptr || pnode->nop == knopLetDecl) |
| { |
| Symbol *sym = pnode->sxVar.sym; |
| Js::RegSlot rhsLocation; |
| |
| byteCodeGenerator->StartStatement(pnode); |
| |
| if (initNode != nullptr) |
| { |
| Emit(initNode, byteCodeGenerator, funcInfo, false); |
| rhsLocation = initNode->location; |
| |
| if (initNode->nop == knopObject) |
| { |
| TrackMemberNodesInObjectForIntConstants(byteCodeGenerator, initNode); |
| } |
| else if (initNode->nop == knopInt) |
| { |
| TrackIntConstantsOnGlobalObject(byteCodeGenerator, sym); |
| } |
| } |
| else |
| { |
| Assert(pnode->nop == knopLetDecl); |
| rhsLocation = funcInfo->AcquireTmpRegister(); |
| byteCodeGenerator->Writer()->Reg1(Js::OpCode::LdUndef, rhsLocation); |
| } |
| |
| if (pnode->nop != knopVarDecl) |
| { |
| Assert(sym->GetDecl() == pnode); |
| sym->SetNeedDeclaration(false); |
| } |
| |
| EmitAssignment(nullptr, pnode, rhsLocation, byteCodeGenerator, funcInfo); |
| funcInfo->ReleaseTmpRegister(rhsLocation); |
| |
| byteCodeGenerator->EndStatement(pnode); |
| } |
| break; |
| } |
| // PTNODE(knopFncDecl , "fncDcl" ,None ,Fnc ,fnopLeaf) |
| case knopFncDecl: |
| // The "function declarations" were emitted in DefineFunctions() |
| if (!pnode->sxFnc.IsDeclaration()) |
| { |
| byteCodeGenerator->DefineOneFunction(pnode, funcInfo, false); |
| } |
| break; |
| // PTNODE(knopClassDecl, "class" ,None ,None ,fnopLeaf) |
| case knopClassDecl: |
| { |
| funcInfo->AcquireLoc(pnode); |
| |
| // Extends |
| if (pnode->sxClass.pnodeExtends) |
| { |
| // We can't do StartStatement/EndStatement for pnodeExtends here because the load locations may differ between |
| // defer and nondefer parse modes. |
| Emit(pnode->sxClass.pnodeExtends, byteCodeGenerator, funcInfo, false); |
| } |
| |
| Assert(pnode->sxClass.pnodeConstructor); |
| pnode->sxClass.pnodeConstructor->location = pnode->location; |
| |
| BeginEmitBlock(pnode->sxClass.pnodeBlock, byteCodeGenerator, funcInfo); |
| |
| // Constructor |
| Emit(pnode->sxClass.pnodeConstructor, byteCodeGenerator, funcInfo, false); |
| EmitComputedFunctionNameVar(bindPnode, pnode->sxClass.pnodeConstructor, byteCodeGenerator); |
| if (pnode->sxClass.pnodeExtends) |
| { |
| byteCodeGenerator->StartStatement(pnode->sxClass.pnodeExtends); |
| byteCodeGenerator->Writer()->InitClass(pnode->location, pnode->sxClass.pnodeExtends->location); |
| byteCodeGenerator->EndStatement(pnode->sxClass.pnodeExtends); |
| } |
| else |
| { |
| byteCodeGenerator->Writer()->InitClass(pnode->location); |
| } |
| |
| Js::RegSlot protoLoc = funcInfo->AcquireTmpRegister(); //register set if we have Instance Methods |
| int cacheId = funcInfo->FindOrAddInlineCacheId(pnode->location, Js::PropertyIds::prototype, false, false); |
| byteCodeGenerator->Writer()->PatchableProperty(Js::OpCode::LdFld, protoLoc, pnode->location, cacheId); |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::SetHomeObj, pnode->location, protoLoc); |
| |
| // Static Methods |
| EmitClassInitializers(pnode->sxClass.pnodeStaticMembers, pnode->location, byteCodeGenerator, funcInfo, pnode, /*isObjectEmpty*/ false); |
| |
| // Instance Methods |
| EmitClassInitializers(pnode->sxClass.pnodeMembers, protoLoc, byteCodeGenerator, funcInfo, pnode, /*isObjectEmpty*/ true); |
| funcInfo->ReleaseTmpRegister(protoLoc); |
| |
| // Emit name binding. |
| if (pnode->sxClass.pnodeName) |
| { |
| Symbol * sym = pnode->sxClass.pnodeName->sxVar.sym; |
| sym->SetNeedDeclaration(false); |
| byteCodeGenerator->EmitPropStore(pnode->location, sym, nullptr, funcInfo, false, true); |
| } |
| |
| EndEmitBlock(pnode->sxClass.pnodeBlock, byteCodeGenerator, funcInfo); |
| |
| if (pnode->sxClass.pnodeExtends) |
| { |
| funcInfo->ReleaseLoc(pnode->sxClass.pnodeExtends); |
| } |
| |
| if (pnode->sxClass.pnodeDeclName) |
| { |
| Symbol * sym = pnode->sxClass.pnodeDeclName->sxVar.sym; |
| sym->SetNeedDeclaration(false); |
| byteCodeGenerator->EmitPropStore(pnode->location, sym, nullptr, funcInfo, true, false); |
| } |
| |
| if (pnode->sxClass.IsDefaultModuleExport()) |
| { |
| byteCodeGenerator->EmitAssignmentToDefaultModuleExport(pnode, funcInfo); |
| } |
| |
| break; |
| } |
| case knopStrTemplate: |
| STARTSTATEMENET_IFTOPLEVEL(isTopLevel, pnode); |
| EmitStringTemplate(pnode, byteCodeGenerator, funcInfo); |
| ENDSTATEMENET_IFTOPLEVEL(isTopLevel, pnode); |
| break; |
| case knopEndCode: |
| byteCodeGenerator->Writer()->RecordStatementAdjustment(Js::FunctionBody::SAT_All); |
| |
| // load undefined for the fallthrough case: |
| if (!funcInfo->IsGlobalFunction()) |
| { |
| if (funcInfo->IsClassConstructor()) |
| { |
| // For class constructors, we need to explicitly load 'this' into the return register. |
| byteCodeGenerator->EmitClassConstructorEndCode(funcInfo); |
| } |
| else |
| { |
| // In the global function, implicit return values are copied to the return register, and if |
| // necessary the return register is initialized at the top. Don't clobber the value here. |
| byteCodeGenerator->Writer()->Reg1(Js::OpCode::LdUndef, ByteCodeGenerator::ReturnRegister); |
| } |
| } |
| |
| // Label for non-fall-through return |
| byteCodeGenerator->Writer()->MarkLabel(funcInfo->singleExit); |
| |
| if (funcInfo->GetHasCachedScope()) |
| { |
| byteCodeGenerator->Writer()->AuxNoReg( |
| Js::OpCode::CommitScope, |
| funcInfo->localPropIdOffset, |
| sizeof(Js::PropertyIdArray) + ((funcInfo->GetBodyScope()->GetScopeSlotCount() + 3) * sizeof(Js::PropertyId))); |
| } |
| byteCodeGenerator->StartStatement(pnode); |
| byteCodeGenerator->Writer()->Empty(Js::OpCode::Ret); |
| byteCodeGenerator->EndStatement(pnode); |
| break; |
| // PTNODE(knopDebugger , "debugger" ,None ,None ,fnopNone) |
| case knopDebugger: |
| byteCodeGenerator->StartStatement(pnode); |
| byteCodeGenerator->Writer()->Empty(Js::OpCode::Break); |
| byteCodeGenerator->EndStatement(pnode); |
| break; |
| // PTNODE(knopFor , "for" ,None ,For ,fnopBreak|fnopContinue) |
| case knopFor: |
| if (pnode->sxFor.pnodeInverted != nullptr) |
| { |
| byteCodeGenerator->EmitInvertedLoop(pnode, pnode->sxFor.pnodeInverted, funcInfo); |
| } |
| else |
| { |
| BeginEmitBlock(pnode->sxFor.pnodeBlock, byteCodeGenerator, funcInfo); |
| Emit(pnode->sxFor.pnodeInit, byteCodeGenerator, funcInfo, false); |
| funcInfo->ReleaseLoc(pnode->sxFor.pnodeInit); |
| if (byteCodeGenerator->IsES6ForLoopSemanticsEnabled()) |
| { |
| CloneEmitBlock(pnode->sxFor.pnodeBlock, byteCodeGenerator, funcInfo); |
| } |
| EmitLoop(pnode, |
| pnode->sxFor.pnodeCond, |
| pnode->sxFor.pnodeBody, |
| pnode->sxFor.pnodeIncr, |
| byteCodeGenerator, |
| funcInfo, |
| fReturnValue, |
| FALSE, |
| pnode->sxFor.pnodeBlock); |
| EndEmitBlock(pnode->sxFor.pnodeBlock, byteCodeGenerator, funcInfo); |
| } |
| break; |
| // PTNODE(knopIf , "if" ,None ,If ,fnopNone) |
| case knopIf: |
| { |
| byteCodeGenerator->StartStatement(pnode); |
| |
| Js::ByteCodeLabel trueLabel = byteCodeGenerator->Writer()->DefineLabel(); |
| Js::ByteCodeLabel falseLabel = byteCodeGenerator->Writer()->DefineLabel(); |
| EmitBooleanExpression(pnode->sxIf.pnodeCond, trueLabel, falseLabel, byteCodeGenerator, funcInfo); |
| funcInfo->ReleaseLoc(pnode->sxIf.pnodeCond); |
| |
| byteCodeGenerator->EndStatement(pnode); |
| |
| byteCodeGenerator->Writer()->MarkLabel(trueLabel); |
| Emit(pnode->sxIf.pnodeTrue, byteCodeGenerator, funcInfo, fReturnValue); |
| funcInfo->ReleaseLoc(pnode->sxIf.pnodeTrue); |
| if (pnode->sxIf.pnodeFalse != nullptr) |
| { |
| // has else clause |
| Js::ByteCodeLabel skipLabel = byteCodeGenerator->Writer()->DefineLabel(); |
| |
| // Record the branch bytecode offset |
| byteCodeGenerator->Writer()->RecordStatementAdjustment(Js::FunctionBody::SAT_FromCurrentToNext); |
| |
| // then clause skips else clause |
| byteCodeGenerator->Writer()->Br(skipLabel); |
| // generate code for else clause |
| byteCodeGenerator->Writer()->MarkLabel(falseLabel); |
| Emit(pnode->sxIf.pnodeFalse, byteCodeGenerator, funcInfo, fReturnValue); |
| funcInfo->ReleaseLoc(pnode->sxIf.pnodeFalse); |
| byteCodeGenerator->Writer()->MarkLabel(skipLabel); |
| } |
| else |
| { |
| byteCodeGenerator->Writer()->MarkLabel(falseLabel); |
| } |
| |
| if (pnode->emitLabels) |
| { |
| byteCodeGenerator->Writer()->MarkLabel(pnode->sxStmt.breakLabel); |
| } |
| break; |
| } |
| case knopWhile: |
| EmitLoop(pnode, |
| pnode->sxWhile.pnodeCond, |
| pnode->sxWhile.pnodeBody, |
| nullptr, |
| byteCodeGenerator, |
| funcInfo, |
| fReturnValue); |
| break; |
| // PTNODE(knopDoWhile , "do-while" ,None ,While,fnopBreak|fnopContinue) |
| case knopDoWhile: |
| EmitLoop(pnode, |
| pnode->sxWhile.pnodeCond, |
| pnode->sxWhile.pnodeBody, |
| nullptr, |
| byteCodeGenerator, |
| funcInfo, |
| fReturnValue, |
| true); |
| break; |
| // PTNODE(knopForIn , "for in" ,None ,ForIn,fnopBreak|fnopContinue|fnopCleanup) |
| case knopForIn: |
| EmitForInOrForOf(pnode, byteCodeGenerator, funcInfo, fReturnValue); |
| break; |
| case knopForOf: |
| EmitForInOrForOf(pnode, byteCodeGenerator, funcInfo, fReturnValue); |
| break; |
| // PTNODE(knopReturn , "return" ,None ,Uni ,fnopNone) |
| case knopReturn: |
| byteCodeGenerator->StartStatement(pnode); |
| if (pnode->sxReturn.pnodeExpr != nullptr) |
| { |
| if (pnode->sxReturn.pnodeExpr->location == Js::Constants::NoRegister) |
| { |
| // No need to burn a register for the return value. If we need a temp, use R0 directly. |
| pnode->sxReturn.pnodeExpr->location = ByteCodeGenerator::ReturnRegister; |
| } |
| Emit(pnode->sxReturn.pnodeExpr, byteCodeGenerator, funcInfo, fReturnValue); |
| if (pnode->sxReturn.pnodeExpr->location != ByteCodeGenerator::ReturnRegister) |
| { |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::Ld_A, ByteCodeGenerator::ReturnRegister, pnode->sxReturn.pnodeExpr->location); |
| } |
| funcInfo->GetParsedFunctionBody()->SetHasNoExplicitReturnValue(false); |
| } |
| else |
| { |
| byteCodeGenerator->Writer()->Reg1(Js::OpCode::LdUndef, ByteCodeGenerator::ReturnRegister); |
| } |
| if (funcInfo->IsClassConstructor()) |
| { |
| // return expr; // becomes like below: |
| // |
| // if (IsObject(expr)) { |
| // return expr; |
| // } else if (IsBaseClassConstructor) { |
| // return this; |
| // } else if (!IsUndefined(expr)) { |
| // throw TypeError; |
| // } |
| |
| Js::ByteCodeLabel returnExprLabel = byteCodeGenerator->Writer()->DefineLabel(); |
| byteCodeGenerator->Writer()->BrReg1(Js::OpCode::BrOnObject_A, returnExprLabel, ByteCodeGenerator::ReturnRegister); |
| |
| if (funcInfo->IsBaseClassConstructor()) |
| { |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::Ld_A, ByteCodeGenerator::ReturnRegister, funcInfo->thisPointerRegister); |
| } |
| else |
| { |
| Js::ByteCodeLabel returnThisLabel = byteCodeGenerator->Writer()->DefineLabel(); |
| byteCodeGenerator->Writer()->BrReg2(Js::OpCode::BrSrEq_A, returnThisLabel, ByteCodeGenerator::ReturnRegister, funcInfo->undefinedConstantRegister); |
| byteCodeGenerator->Writer()->W1(Js::OpCode::RuntimeTypeError, SCODE_CODE(JSERR_ClassDerivedConstructorInvalidReturnType)); |
| byteCodeGenerator->Writer()->MarkLabel(returnThisLabel); |
| byteCodeGenerator->EmitClassConstructorEndCode(funcInfo); |
| } |
| |
| byteCodeGenerator->Writer()->MarkLabel(returnExprLabel); |
| } |
| if (pnode->sxStmt.grfnop & fnopCleanup) |
| { |
| EmitJumpCleanup(pnode, nullptr, byteCodeGenerator, funcInfo); |
| } |
| |
| byteCodeGenerator->Writer()->Br(funcInfo->singleExit); |
| byteCodeGenerator->EndStatement(pnode); |
| break; |
| case knopLabel: |
| break; |
| // PTNODE(knopBlock , "{}" ,None ,Block,fnopNone) |
| case knopBlock: |
| if (pnode->sxBlock.pnodeStmt != nullptr) |
| { |
| EmitBlock(pnode, byteCodeGenerator, funcInfo, fReturnValue); |
| if (pnode->emitLabels) |
| { |
| byteCodeGenerator->Writer()->MarkLabel(pnode->sxStmt.breakLabel); |
| } |
| } |
| break; |
| // PTNODE(knopWith , "with" ,None ,With ,fnopCleanup) |
| case knopWith: |
| { |
| Assert(pnode->sxWith.pnodeObj != nullptr); |
| byteCodeGenerator->StartStatement(pnode); |
| // Copy the with object to a temp register (the location assigned to pnode) so that if the with object |
| // is overwritten in the body, the lookups are not affected. |
| funcInfo->AcquireLoc(pnode); |
| Emit(pnode->sxWith.pnodeObj, byteCodeGenerator, funcInfo, false); |
| |
| Js::RegSlot regVal = (byteCodeGenerator->GetScriptContext()->GetConfig()->IsES6UnscopablesEnabled()) ? funcInfo->AcquireTmpRegister() : pnode->location; |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::Conv_Obj, regVal, pnode->sxWith.pnodeObj->location); |
| if (byteCodeGenerator->GetScriptContext()->GetConfig()->IsES6UnscopablesEnabled()) |
| { |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::NewWithObject, pnode->location, regVal); |
| } |
| byteCodeGenerator->EndStatement(pnode); |
| |
| #ifdef PERF_HINT |
| if (PHASE_TRACE1(Js::PerfHintPhase)) |
| { |
| WritePerfHint(PerfHints::HasWithBlock, funcInfo->byteCodeFunction->GetFunctionBody(), byteCodeGenerator->Writer()->GetCurrentOffset() - 1); |
| } |
| #endif |
| if (pnode->sxWith.pnodeBody != nullptr) |
| { |
| Scope *scope = pnode->sxWith.scope; |
| scope->SetLocation(pnode->location); |
| byteCodeGenerator->PushScope(scope); |
| |
| Js::DebuggerScope *debuggerScope = byteCodeGenerator->RecordStartScopeObject(pnode, Js::DiagExtraScopesType::DiagWithScope, regVal); |
| |
| if (byteCodeGenerator->ShouldTrackDebuggerMetadata()) |
| { |
| byteCodeGenerator->Writer()->AddPropertyToDebuggerScope(debuggerScope, regVal, Js::Constants::NoProperty, /*shouldConsumeRegister*/ true, Js::DebuggerScopePropertyFlags_WithObject); |
| } |
| |
| Emit(pnode->sxWith.pnodeBody, byteCodeGenerator, funcInfo, fReturnValue); |
| funcInfo->ReleaseLoc(pnode->sxWith.pnodeBody); |
| byteCodeGenerator->PopScope(); |
| |
| byteCodeGenerator->RecordEndScopeObject(pnode); |
| } |
| if (pnode->emitLabels) |
| { |
| byteCodeGenerator->Writer()->MarkLabel(pnode->sxStmt.breakLabel); |
| } |
| if (byteCodeGenerator->GetScriptContext()->GetConfig()->IsES6UnscopablesEnabled()) |
| { |
| funcInfo->ReleaseTmpRegister(regVal); |
| } |
| funcInfo->ReleaseLoc(pnode->sxWith.pnodeObj); |
| break; |
| } |
| // PTNODE(knopBreak , "break" ,None ,Jump ,fnopNone) |
| case knopBreak: |
| Assert(pnode->sxJump.pnodeTarget->emitLabels); |
| byteCodeGenerator->StartStatement(pnode); |
| if (pnode->sxStmt.grfnop & fnopCleanup) |
| { |
| EmitJumpCleanup(pnode, pnode->sxJump.pnodeTarget, byteCodeGenerator, funcInfo); |
| } |
| byteCodeGenerator->Writer()->Br(pnode->sxJump.pnodeTarget->sxStmt.breakLabel); |
| if (pnode->emitLabels) |
| { |
| byteCodeGenerator->Writer()->MarkLabel(pnode->sxStmt.breakLabel); |
| } |
| byteCodeGenerator->EndStatement(pnode); |
| break; |
| case knopContinue: |
| Assert(pnode->sxJump.pnodeTarget->emitLabels); |
| byteCodeGenerator->StartStatement(pnode); |
| if (pnode->sxStmt.grfnop & fnopCleanup) |
| { |
| EmitJumpCleanup(pnode, pnode->sxJump.pnodeTarget, byteCodeGenerator, funcInfo); |
| } |
| byteCodeGenerator->Writer()->Br(pnode->sxJump.pnodeTarget->sxStmt.continueLabel); |
| byteCodeGenerator->EndStatement(pnode); |
| break; |
| // PTNODE(knopContinue , "continue" ,None ,Jump ,fnopNone) |
| case knopSwitch: |
| { |
| BOOL fHasDefault = false; |
| Assert(pnode->sxSwitch.pnodeVal != nullptr); |
| byteCodeGenerator->StartStatement(pnode); |
| Emit(pnode->sxSwitch.pnodeVal, byteCodeGenerator, funcInfo, false); |
| |
| Js::RegSlot regVal = funcInfo->AcquireTmpRegister(); |
| |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::BeginSwitch, regVal, pnode->sxSwitch.pnodeVal->location); |
| |
| BeginEmitBlock(pnode->sxSwitch.pnodeBlock, byteCodeGenerator, funcInfo); |
| |
| byteCodeGenerator->EndStatement(pnode); |
| |
| // TODO: if all cases are compile-time constants, emit a switch statement in the byte |
| // code so the BE can optimize it. |
| |
| ParseNode *pnodeCase; |
| for (pnodeCase = pnode->sxSwitch.pnodeCases; pnodeCase; pnodeCase = pnodeCase->sxCase.pnodeNext) |
| { |
| // Jump to the first case body if this one doesn't match. Make sure any side-effects of the case |
| // expression take place regardless. |
| pnodeCase->sxCase.labelCase = byteCodeGenerator->Writer()->DefineLabel(); |
| if (pnodeCase == pnode->sxSwitch.pnodeDefault) |
| { |
| fHasDefault = true; |
| continue; |
| } |
| Emit(pnodeCase->sxCase.pnodeExpr, byteCodeGenerator, funcInfo, false); |
| byteCodeGenerator->Writer()->BrReg2( |
| Js::OpCode::Case, pnodeCase->sxCase.labelCase, regVal, pnodeCase->sxCase.pnodeExpr->location); |
| funcInfo->ReleaseLoc(pnodeCase->sxCase.pnodeExpr); |
| } |
| |
| // No explicit case value matches. Jump to the default arm (if any) or break out altogether. |
| if (fHasDefault) |
| { |
| byteCodeGenerator->Writer()->Br(Js::OpCode::EndSwitch, pnode->sxSwitch.pnodeDefault->sxCase.labelCase); |
| } |
| else |
| { |
| if (!pnode->emitLabels) |
| { |
| pnode->sxStmt.breakLabel = byteCodeGenerator->Writer()->DefineLabel(); |
| } |
| byteCodeGenerator->Writer()->Br(Js::OpCode::EndSwitch, pnode->sxStmt.breakLabel); |
| } |
| // Now emit the case arms to which we jump on matching a case value. |
| for (pnodeCase = pnode->sxSwitch.pnodeCases; pnodeCase; pnodeCase = pnodeCase->sxCase.pnodeNext) |
| { |
| byteCodeGenerator->Writer()->MarkLabel(pnodeCase->sxCase.labelCase); |
| Emit(pnodeCase->sxCase.pnodeBody, byteCodeGenerator, funcInfo, fReturnValue); |
| funcInfo->ReleaseLoc(pnodeCase->sxCase.pnodeBody); |
| } |
| |
| EndEmitBlock(pnode->sxSwitch.pnodeBlock, byteCodeGenerator, funcInfo); |
| funcInfo->ReleaseTmpRegister(regVal); |
| funcInfo->ReleaseLoc(pnode->sxSwitch.pnodeVal); |
| |
| if (!fHasDefault || pnode->emitLabels) |
| { |
| byteCodeGenerator->Writer()->MarkLabel(pnode->sxStmt.breakLabel); |
| } |
| break; |
| } |
| |
| case knopTryCatch: |
| { |
| Js::ByteCodeLabel catchLabel = (Js::ByteCodeLabel) - 1; |
| |
| ParseNode *pnodeTry = pnode->sxTryCatch.pnodeTry; |
| Assert(pnodeTry); |
| ParseNode *pnodeCatch = pnode->sxTryCatch.pnodeCatch; |
| Assert(pnodeCatch); |
| |
| catchLabel = byteCodeGenerator->Writer()->DefineLabel(); |
| |
| // Note: try uses OpCode::Leave which causes a return to parent interpreter thunk, |
| // same for catch block. Thus record cross interpreter frame entry/exit records for them. |
| byteCodeGenerator->Writer()->RecordCrossFrameEntryExitRecord(/* isEnterBlock = */ true); |
| |
| byteCodeGenerator->Writer()->Br(Js::OpCode::TryCatch, catchLabel); |
| |
| ByteCodeGenerator::TryScopeRecord tryRecForTry(Js::OpCode::TryCatch, catchLabel); |
| if (funcInfo->byteCodeFunction->IsGenerator()) |
| { |
| byteCodeGenerator->tryScopeRecordsList.LinkToEnd(&tryRecForTry); |
| } |
| |
| Emit(pnodeTry->sxTry.pnodeBody, byteCodeGenerator, funcInfo, fReturnValue); |
| funcInfo->ReleaseLoc(pnodeTry->sxTry.pnodeBody); |
| |
| if (funcInfo->byteCodeFunction->IsGenerator()) |
| { |
| byteCodeGenerator->tryScopeRecordsList.UnlinkFromEnd(); |
| } |
| |
| byteCodeGenerator->Writer()->RecordCrossFrameEntryExitRecord(/* isEnterBlock = */ false); |
| |
| byteCodeGenerator->Writer()->Empty(Js::OpCode::Leave); |
| byteCodeGenerator->Writer()->Br(pnode->sxStmt.breakLabel); |
| byteCodeGenerator->Writer()->MarkLabel(catchLabel); |
| Assert(pnodeCatch->sxCatch.pnodeParam); |
| ParseNode *pnodeObj = pnodeCatch->sxCatch.pnodeParam; |
| Js::RegSlot location; |
| |
| bool acquiredTempLocation = false; |
| |
| Js::DebuggerScope *debuggerScope = nullptr; |
| Js::DebuggerScopePropertyFlags debuggerPropertyFlags = Js::DebuggerScopePropertyFlags_CatchObject; |
| |
| bool isPattern = pnodeObj->nop == knopParamPattern; |
| |
| if (isPattern) |
| { |
| location = pnodeObj->sxParamPattern.location; |
| } |
| else |
| { |
| location = pnodeObj->sxPid.sym->GetLocation(); |
| } |
| |
| if (location == Js::Constants::NoRegister) |
| { |
| location = funcInfo->AcquireLoc(pnodeObj); |
| acquiredTempLocation = true; |
| } |
| byteCodeGenerator->Writer()->Reg1(Js::OpCode::Catch, location); |
| |
| Scope *scope = pnodeCatch->sxCatch.scope; |
| |
| if (isPattern || scope->GetMustInstantiate()) |
| { |
| byteCodeGenerator->PushScope(scope); |
| } |
| |
| if (scope->GetMustInstantiate()) |
| { |
| Assert(scope->GetLocation() == Js::Constants::NoRegister); |
| if (scope->GetIsObject()) |
| { |
| debuggerScope = byteCodeGenerator->RecordStartScopeObject(pnode, Js::DiagCatchScopeInObject, funcInfo->InnerScopeToRegSlot(scope)); |
| byteCodeGenerator->Writer()->Unsigned1(Js::OpCode::NewPseudoScope, scope->GetInnerScopeIndex()); |
| } |
| else |
| { |
| |
| int index = Js::DebuggerScope::InvalidScopeIndex; |
| debuggerScope = byteCodeGenerator->RecordStartScopeObject(pnode, Js::DiagCatchScopeInSlot, funcInfo->InnerScopeToRegSlot(scope), &index); |
| |
| byteCodeGenerator->Writer()->Num3(Js::OpCode::NewInnerScopeSlots, scope->GetInnerScopeIndex(), scope->GetScopeSlotCount() + Js::ScopeSlots::FirstSlotIndex, index); |
| } |
| } |
| else |
| { |
| debuggerScope = byteCodeGenerator->RecordStartScopeObject(pnode, Js::DiagCatchScopeDirect, location); |
| } |
| |
| auto ParamTrackAndInitialization = [&](Symbol *sym, bool initializeParam, Js::RegSlot location) |
| { |
| if (sym->IsInSlot(funcInfo)) |
| { |
| Assert(scope->GetMustInstantiate()); |
| if (scope->GetIsObject()) |
| { |
| Js::OpCode op = (sym->GetDecl()->nop == knopLetDecl) ? Js::OpCode::InitUndeclLetFld : |
| byteCodeGenerator->GetInitFldOp(scope, scope->GetLocation(), funcInfo, false); |
| |
| Js::PropertyId propertyId = sym->EnsurePosition(byteCodeGenerator); |
| uint cacheId = funcInfo->FindOrAddInlineCacheId(funcInfo->InnerScopeToRegSlot(scope), propertyId, false, true); |
| byteCodeGenerator->Writer()->ElementPIndexed(op, location, scope->GetInnerScopeIndex(), cacheId); |
| |
| byteCodeGenerator->TrackActivationObjectPropertyForDebugger(debuggerScope, sym, debuggerPropertyFlags); |
| } |
| else |
| { |
| byteCodeGenerator->TrackSlotArrayPropertyForDebugger(debuggerScope, sym, sym->EnsurePosition(byteCodeGenerator), debuggerPropertyFlags); |
| if (initializeParam) |
| { |
| byteCodeGenerator->EmitLocalPropInit(location, sym, funcInfo); |
| } |
| else |
| { |
| Js::RegSlot tmpReg = funcInfo->AcquireTmpRegister(); |
| byteCodeGenerator->Writer()->Reg1(Js::OpCode::InitUndecl, tmpReg); |
| byteCodeGenerator->EmitLocalPropInit(tmpReg, sym, funcInfo); |
| funcInfo->ReleaseTmpRegister(tmpReg); |
| } |
| } |
| } |
| else |
| { |
| byteCodeGenerator->TrackRegisterPropertyForDebugger(debuggerScope, sym, funcInfo, debuggerPropertyFlags); |
| if (initializeParam) |
| { |
| byteCodeGenerator->EmitLocalPropInit(location, sym, funcInfo); |
| } |
| else |
| { |
| byteCodeGenerator->Writer()->Reg1(Js::OpCode::InitUndecl, location); |
| } |
| } |
| }; |
| |
| if (isPattern) |
| { |
| Parser::MapBindIdentifier(pnodeObj->sxParamPattern.pnode1, [&](ParseNodePtr item) |
| { |
| ParamTrackAndInitialization(item->sxVar.sym, false /*initializeParam*/, item->sxVar.sym->GetLocation()); |
| }); |
| byteCodeGenerator->Writer()->RecordCrossFrameEntryExitRecord(true); |
| |
| // Now emitting bytecode for destructuring pattern |
| byteCodeGenerator->StartStatement(pnodeCatch); |
| ParseNodePtr pnode1 = pnodeObj->sxParamPattern.pnode1; |
| Assert(pnode1->IsPattern()); |
| EmitAssignment(nullptr, pnode1, location, byteCodeGenerator, funcInfo); |
| byteCodeGenerator->EndStatement(pnodeCatch); |
| } |
| else |
| { |
| ParamTrackAndInitialization(pnodeObj->sxPid.sym, true /*initializeParam*/, location); |
| if (scope->GetMustInstantiate()) |
| { |
| pnodeObj->sxPid.sym->SetIsGlobalCatch(true); |
| } |
| byteCodeGenerator->Writer()->RecordCrossFrameEntryExitRecord(true); |
| |
| // Allow a debugger to stop on the 'catch (e)' |
| byteCodeGenerator->StartStatement(pnodeCatch); |
| byteCodeGenerator->Writer()->Empty(Js::OpCode::Nop); |
| byteCodeGenerator->EndStatement(pnodeCatch); |
| } |
| |
| ByteCodeGenerator::TryScopeRecord tryRecForCatch(Js::OpCode::ResumeCatch, catchLabel); |
| if (funcInfo->byteCodeFunction->IsGenerator()) |
| { |
| byteCodeGenerator->tryScopeRecordsList.LinkToEnd(&tryRecForCatch); |
| } |
| |
| Emit(pnodeCatch->sxCatch.pnodeBody, byteCodeGenerator, funcInfo, fReturnValue); |
| |
| if (funcInfo->byteCodeFunction->IsGenerator()) |
| { |
| byteCodeGenerator->tryScopeRecordsList.UnlinkFromEnd(); |
| } |
| |
| if (scope->GetMustInstantiate() || isPattern) |
| { |
| byteCodeGenerator->PopScope(); |
| } |
| |
| byteCodeGenerator->RecordEndScopeObject(pnode); |
| |
| funcInfo->ReleaseLoc(pnodeCatch->sxCatch.pnodeBody); |
| |
| if (acquiredTempLocation) |
| { |
| funcInfo->ReleaseLoc(pnodeObj); |
| } |
| |
| byteCodeGenerator->Writer()->RecordCrossFrameEntryExitRecord(false); |
| |
| byteCodeGenerator->Writer()->Empty(Js::OpCode::Leave); |
| byteCodeGenerator->Writer()->MarkLabel(pnode->sxStmt.breakLabel); |
| break; |
| } |
| |
| case knopTryFinally: |
| { |
| Js::ByteCodeLabel finallyLabel = (Js::ByteCodeLabel) - 1; |
| |
| ParseNode *pnodeTry = pnode->sxTryFinally.pnodeTry; |
| Assert(pnodeTry); |
| ParseNode *pnodeFinally = pnode->sxTryFinally.pnodeFinally; |
| Assert(pnodeFinally); |
| |
| // If we yield from the finally block after an exception, we have to store the exception object for the future next call. |
| // When we yield from the Try-Finally the offset to the end of the Try block is needed for the branch instruction. |
| Js::RegSlot regException = Js::Constants::NoRegister; |
| Js::RegSlot regOffset = Js::Constants::NoRegister; |
| |
| finallyLabel = byteCodeGenerator->Writer()->DefineLabel(); |
| byteCodeGenerator->Writer()->RecordCrossFrameEntryExitRecord(true); |
| |
| // [CONSIDER][aneeshd] Ideally the TryFinallyWithYield opcode needs to be used only if there is a yield expression. |
| // For now, if the function is generator we are using the TryFinallyWithYield. |
| ByteCodeGenerator::TryScopeRecord tryRecForTry(Js::OpCode::TryFinallyWithYield, finallyLabel); |
| if (funcInfo->byteCodeFunction->IsGenerator()) |
| { |
| regException = funcInfo->AcquireTmpRegister(); |
| regOffset = funcInfo->AcquireTmpRegister(); |
| byteCodeGenerator->Writer()->BrReg2(Js::OpCode::TryFinallyWithYield, finallyLabel, regException, regOffset); |
| tryRecForTry.reg1 = regException; |
| tryRecForTry.reg2 = regOffset; |
| byteCodeGenerator->tryScopeRecordsList.LinkToEnd(&tryRecForTry); |
| } |
| else |
| { |
| byteCodeGenerator->Writer()->Br(Js::OpCode::TryFinally, finallyLabel); |
| } |
| |
| Emit(pnodeTry->sxTry.pnodeBody, byteCodeGenerator, funcInfo, fReturnValue); |
| funcInfo->ReleaseLoc(pnodeTry->sxTry.pnodeBody); |
| |
| if (funcInfo->byteCodeFunction->IsGenerator()) |
| { |
| byteCodeGenerator->tryScopeRecordsList.UnlinkFromEnd(); |
| } |
| |
| byteCodeGenerator->Writer()->Empty(Js::OpCode::Leave); |
| byteCodeGenerator->Writer()->RecordCrossFrameEntryExitRecord(false); |
| |
| // Note: although we don't use OpCode::Leave for finally block, |
| // OpCode::LeaveNull causes a return to parent interpreter thunk. |
| // This has to be on offset prior to offset of 1st statement of finally. |
| byteCodeGenerator->Writer()->RecordCrossFrameEntryExitRecord(true); |
| |
| byteCodeGenerator->Writer()->Br(pnode->sxStmt.breakLabel); |
| byteCodeGenerator->Writer()->MarkLabel(finallyLabel); |
| |
| ByteCodeGenerator::TryScopeRecord tryRecForFinally(Js::OpCode::ResumeFinally, finallyLabel, regException, regOffset); |
| if (funcInfo->byteCodeFunction->IsGenerator()) |
| { |
| byteCodeGenerator->tryScopeRecordsList.LinkToEnd(&tryRecForFinally); |
| } |
| |
| Emit(pnodeFinally->sxFinally.pnodeBody, byteCodeGenerator, funcInfo, fReturnValue); |
| funcInfo->ReleaseLoc(pnodeFinally->sxFinally.pnodeBody); |
| |
| if (funcInfo->byteCodeFunction->IsGenerator()) |
| { |
| byteCodeGenerator->tryScopeRecordsList.UnlinkFromEnd(); |
| funcInfo->ReleaseTmpRegister(regOffset); |
| funcInfo->ReleaseTmpRegister(regException); |
| } |
| |
| byteCodeGenerator->Writer()->RecordCrossFrameEntryExitRecord(false); |
| |
| byteCodeGenerator->Writer()->Empty(Js::OpCode::LeaveNull); |
| |
| byteCodeGenerator->Writer()->MarkLabel(pnode->sxStmt.breakLabel); |
| break; |
| } |
| case knopThrow: |
| byteCodeGenerator->StartStatement(pnode); |
| Emit(pnode->sxUni.pnode1, byteCodeGenerator, funcInfo, false); |
| byteCodeGenerator->Writer()->Reg1(Js::OpCode::Throw, pnode->sxUni.pnode1->location); |
| funcInfo->ReleaseLoc(pnode->sxUni.pnode1); |
| byteCodeGenerator->EndStatement(pnode); |
| break; |
| case knopYieldLeaf: |
| byteCodeGenerator->StartStatement(pnode); |
| funcInfo->AcquireLoc(pnode); |
| EmitYield(funcInfo->undefinedConstantRegister, pnode->location, byteCodeGenerator, funcInfo); |
| byteCodeGenerator->EndStatement(pnode); |
| break; |
| case knopAwait: |
| case knopYield: |
| byteCodeGenerator->StartStatement(pnode); |
| funcInfo->AcquireLoc(pnode); |
| Emit(pnode->sxUni.pnode1, byteCodeGenerator, funcInfo, false); |
| EmitYield(pnode->sxUni.pnode1->location, pnode->location, byteCodeGenerator, funcInfo); |
| funcInfo->ReleaseLoc(pnode->sxUni.pnode1); |
| byteCodeGenerator->EndStatement(pnode); |
| break; |
| case knopYieldStar: |
| byteCodeGenerator->StartStatement(pnode); |
| EmitYieldStar(pnode, byteCodeGenerator, funcInfo); |
| byteCodeGenerator->EndStatement(pnode); |
| break; |
| case knopAsyncSpawn: |
| EmitBinary(Js::OpCode::AsyncSpawn, pnode, byteCodeGenerator, funcInfo); |
| break; |
| case knopExportDefault: |
| Emit(pnode->sxExportDefault.pnodeExpr, byteCodeGenerator, funcInfo, false); |
| byteCodeGenerator->EmitAssignmentToDefaultModuleExport(pnode->sxExportDefault.pnodeExpr, funcInfo); |
| funcInfo->ReleaseLoc(pnode->sxExportDefault.pnodeExpr); |
| pnode = pnode->sxExportDefault.pnodeExpr; |
| break; |
| default: |
| AssertMsg(0, "emit unhandled pnode op"); |
| break; |
| } |
| |
| if (fReturnValue && IsExpressionStatement(pnode, byteCodeGenerator->GetScriptContext())) |
| { |
| // If this statement may produce the global function's return value, copy its result to the return register. |
| // fReturnValue implies global function, which implies that "return" is a parse error. |
| Assert(funcInfo->IsGlobalFunction()); |
| Assert(pnode->nop != knopReturn); |
| byteCodeGenerator->Writer()->Reg2(Js::OpCode::Ld_A, ByteCodeGenerator::ReturnRegister, pnode->location); |
| } |
| } |