Google Git
Sign in
chromium / external / github.com / WebKit / webkit / 52911fd26d6c1648630014510f00f355e3e83c13 / . / Source / JavaScriptCore / dfg / DFGSpeculativeJIT.cpp
blob: afa97cea3059e0dac4e1bb025446cd6c734f9f2b [file] [log] [blame]
/*
* Copyright (C) 2011, 2012, 2013, 2014 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "DFGSpeculativeJIT.h"
#if ENABLE(DFG_JIT)
#include "Arguments.h"
#include "DFGAbstractInterpreterInlines.h"
#include "DFGArrayifySlowPathGenerator.h"
#include "DFGBinarySwitch.h"
#include "DFGCallArrayAllocatorSlowPathGenerator.h"
#include "DFGSaneStringGetByValSlowPathGenerator.h"
#include "DFGSlowPathGenerator.h"
#include "LinkBuffer.h"
#include "JSCInlines.h"
#include "ScratchRegisterAllocator.h"
#include "WriteBarrierBuffer.h"
#include <wtf/MathExtras.h>
namespace JSC { namespace DFG {
SpeculativeJIT::SpeculativeJIT(JITCompiler& jit)
: m_compileOkay(true)
, m_jit(jit)
, m_currentNode(0)
, m_lastGeneratedNode(LastNodeType)
, m_indexInBlock(0)
, m_generationInfo(m_jit.graph().frameRegisterCount())
, m_state(m_jit.graph())
, m_interpreter(m_jit.graph(), m_state)
, m_stream(&jit.jitCode()->variableEventStream)
, m_minifiedGraph(&jit.jitCode()->minifiedDFG)
, m_isCheckingArgumentTypes(false)
{
}
SpeculativeJIT::~SpeculativeJIT()
{
}
void SpeculativeJIT::emitAllocateJSArray(GPRReg resultGPR, Structure* structure, GPRReg storageGPR, unsigned numElements)
{
ASSERT(hasUndecided(structure->indexingType()) || hasInt32(structure->indexingType()) || hasDouble(structure->indexingType()) || hasContiguous(structure->indexingType()));
GPRTemporary scratch(this);
GPRTemporary scratch2(this);
GPRReg scratchGPR = scratch.gpr();
GPRReg scratch2GPR = scratch2.gpr();
unsigned vectorLength = std::max(BASE_VECTOR_LEN, numElements);
JITCompiler::JumpList slowCases;
slowCases.append(
emitAllocateBasicStorage(TrustedImm32(vectorLength * sizeof(JSValue) + sizeof(IndexingHeader)), storageGPR));
m_jit.subPtr(TrustedImm32(vectorLength * sizeof(JSValue)), storageGPR);
emitAllocateJSObject<JSArray>(resultGPR, TrustedImmPtr(structure), storageGPR, scratchGPR, scratch2GPR, slowCases);
m_jit.store32(TrustedImm32(numElements), MacroAssembler::Address(storageGPR, Butterfly::offsetOfPublicLength()));
m_jit.store32(TrustedImm32(vectorLength), MacroAssembler::Address(storageGPR, Butterfly::offsetOfVectorLength()));
if (hasDouble(structure->indexingType()) && numElements < vectorLength) {
#if USE(JSVALUE64)
m_jit.move(TrustedImm64(bitwise_cast<int64_t>(PNaN)), scratchGPR);
for (unsigned i = numElements; i < vectorLength; ++i)
m_jit.store64(scratchGPR, MacroAssembler::Address(storageGPR, sizeof(double) * i));
#else
EncodedValueDescriptor value;
value.asInt64 = JSValue::encode(JSValue(JSValue::EncodeAsDouble, PNaN));
for (unsigned i = numElements; i < vectorLength; ++i) {
m_jit.store32(TrustedImm32(value.asBits.tag), MacroAssembler::Address(storageGPR, sizeof(double) * i + OBJECT_OFFSETOF(JSValue, u.asBits.tag)));
m_jit.store32(TrustedImm32(value.asBits.payload), MacroAssembler::Address(storageGPR, sizeof(double) * i + OBJECT_OFFSETOF(JSValue, u.asBits.payload)));
}
#endif
}
// I want a slow path that also loads out the storage pointer, and that's
// what this custom CallArrayAllocatorSlowPathGenerator gives me. It's a lot
// of work for a very small piece of functionality. :-/
addSlowPathGenerator(adoptPtr(
new CallArrayAllocatorSlowPathGenerator(
slowCases, this, operationNewArrayWithSize, resultGPR, storageGPR,
structure, numElements)));
}
void SpeculativeJIT::emitAllocateArguments(GPRReg resultGPR, GPRReg scratchGPR1, GPRReg scratchGPR2, MacroAssembler::JumpList& slowPath)
{
Structure* structure = m_jit.graph().globalObjectFor(m_currentNode->origin.semantic)->argumentsStructure();
emitAllocateDestructibleObject<Arguments>(resultGPR, structure, scratchGPR1, scratchGPR2, slowPath);
m_jit.storePtr(TrustedImmPtr(0), MacroAssembler::Address(resultGPR, Arguments::offsetOfActivation()));
m_jit.load32(JITCompiler::payloadFor(JSStack::ArgumentCount), scratchGPR1);
m_jit.sub32(TrustedImm32(1), scratchGPR1);
m_jit.store32(scratchGPR1, MacroAssembler::Address(resultGPR, Arguments::offsetOfNumArguments()));
m_jit.store32(TrustedImm32(0), MacroAssembler::Address(resultGPR, Arguments::offsetOfOverrodeLength()));
if (m_jit.isStrictModeFor(m_currentNode->origin.semantic))
m_jit.store8(TrustedImm32(1), MacroAssembler::Address(resultGPR, Arguments::offsetOfIsStrictMode()));
m_jit.storePtr(GPRInfo::callFrameRegister, MacroAssembler::Address(resultGPR, Arguments::offsetOfRegisters()));
m_jit.storePtr(TrustedImmPtr(0), MacroAssembler::Address(resultGPR, Arguments::offsetOfRegisterArray()));
m_jit.storePtr(TrustedImmPtr(0), MacroAssembler::Address(resultGPR, Arguments::offsetOfSlowArgumentData()));
m_jit.loadPtr(JITCompiler::addressFor(JSStack::Callee), scratchGPR1);
m_jit.storePtr(scratchGPR1, MacroAssembler::Address(resultGPR, Arguments::offsetOfCallee()));
}
void SpeculativeJIT::speculationCheck(ExitKind kind, JSValueSource jsValueSource, Node* node, MacroAssembler::Jump jumpToFail)
{
if (!m_compileOkay)
return;
ASSERT(m_isCheckingArgumentTypes || m_canExit);
m_jit.appendExitInfo(jumpToFail);
m_jit.jitCode()->appendOSRExit(OSRExit(kind, jsValueSource, m_jit.graph().methodOfGettingAValueProfileFor(node), this, m_stream->size()));
}
void SpeculativeJIT::speculationCheck(ExitKind kind, JSValueSource jsValueSource, Node* node, const MacroAssembler::JumpList& jumpsToFail)
{
if (!m_compileOkay)
return;
ASSERT(m_isCheckingArgumentTypes || m_canExit);
m_jit.appendExitInfo(jumpsToFail);
m_jit.jitCode()->appendOSRExit(OSRExit(kind, jsValueSource, m_jit.graph().methodOfGettingAValueProfileFor(node), this, m_stream->size()));
}
OSRExitJumpPlaceholder SpeculativeJIT::speculationCheck(ExitKind kind, JSValueSource jsValueSource, Node* node)
{
if (!m_compileOkay)
return OSRExitJumpPlaceholder();
ASSERT(m_isCheckingArgumentTypes || m_canExit);
unsigned index = m_jit.jitCode()->osrExit.size();
m_jit.appendExitInfo();
m_jit.jitCode()->appendOSRExit(OSRExit(kind, jsValueSource, m_jit.graph().methodOfGettingAValueProfileFor(node), this, m_stream->size()));
return OSRExitJumpPlaceholder(index);
}
OSRExitJumpPlaceholder SpeculativeJIT::speculationCheck(ExitKind kind, JSValueSource jsValueSource, Edge nodeUse)
{
ASSERT(m_isCheckingArgumentTypes || m_canExit);
return speculationCheck(kind, jsValueSource, nodeUse.node());
}
void SpeculativeJIT::speculationCheck(ExitKind kind, JSValueSource jsValueSource, Edge nodeUse, MacroAssembler::Jump jumpToFail)
{
ASSERT(m_isCheckingArgumentTypes || m_canExit);
speculationCheck(kind, jsValueSource, nodeUse.node(), jumpToFail);
}
void SpeculativeJIT::speculationCheck(ExitKind kind, JSValueSource jsValueSource, Edge nodeUse, const MacroAssembler::JumpList& jumpsToFail)
{
ASSERT(m_isCheckingArgumentTypes || m_canExit);
speculationCheck(kind, jsValueSource, nodeUse.node(), jumpsToFail);
}
void SpeculativeJIT::speculationCheck(ExitKind kind, JSValueSource jsValueSource, Node* node, MacroAssembler::Jump jumpToFail, const SpeculationRecovery& recovery)
{
if (!m_compileOkay)
return;
ASSERT(m_isCheckingArgumentTypes || m_canExit);
unsigned recoveryIndex = m_jit.jitCode()->appendSpeculationRecovery(recovery);
m_jit.appendExitInfo(jumpToFail);
m_jit.jitCode()->appendOSRExit(OSRExit(kind, jsValueSource, m_jit.graph().methodOfGettingAValueProfileFor(node), this, m_stream->size(), recoveryIndex));
}
void SpeculativeJIT::speculationCheck(ExitKind kind, JSValueSource jsValueSource, Edge nodeUse, MacroAssembler::Jump jumpToFail, const SpeculationRecovery& recovery)
{
ASSERT(m_isCheckingArgumentTypes || m_canExit);
speculationCheck(kind, jsValueSource, nodeUse.node(), jumpToFail, recovery);
}
void SpeculativeJIT::emitInvalidationPoint(Node* node)
{
if (!m_compileOkay)
return;
ASSERT(m_canExit);
OSRExitCompilationInfo& info = m_jit.appendExitInfo(JITCompiler::JumpList());
m_jit.jitCode()->appendOSRExit(OSRExit(
UncountableInvalidation, JSValueSource(),
m_jit.graph().methodOfGettingAValueProfileFor(node),
this, m_stream->size()));
info.m_replacementSource = m_jit.watchpointLabel();
ASSERT(info.m_replacementSource.isSet());
noResult(node);
}
void SpeculativeJIT::terminateSpeculativeExecution(ExitKind kind, JSValueRegs jsValueRegs, Node* node)
{
ASSERT(m_isCheckingArgumentTypes || m_canExit);
if (!m_compileOkay)
return;
speculationCheck(kind, jsValueRegs, node, m_jit.jump());
m_compileOkay = false;
}
void SpeculativeJIT::terminateSpeculativeExecution(ExitKind kind, JSValueRegs jsValueRegs, Edge nodeUse)
{
ASSERT(m_isCheckingArgumentTypes || m_canExit);
terminateSpeculativeExecution(kind, jsValueRegs, nodeUse.node());
}
void SpeculativeJIT::typeCheck(JSValueSource source, Edge edge, SpeculatedType typesPassedThrough, MacroAssembler::Jump jumpToFail)
{
ASSERT(needsTypeCheck(edge, typesPassedThrough));
m_interpreter.filter(edge, typesPassedThrough);
speculationCheck(BadType, source, edge.node(), jumpToFail);
}
RegisterSet SpeculativeJIT::usedRegisters()
{
RegisterSet result;
for (unsigned i = GPRInfo::numberOfRegisters; i--;) {
GPRReg gpr = GPRInfo::toRegister(i);
if (m_gprs.isInUse(gpr))
result.set(gpr);
}
for (unsigned i = FPRInfo::numberOfRegisters; i--;) {
FPRReg fpr = FPRInfo::toRegister(i);
if (m_fprs.isInUse(fpr))
result.set(fpr);
}
result.merge(RegisterSet::specialRegisters());
return result;
}
void SpeculativeJIT::addSlowPathGenerator(PassOwnPtr<SlowPathGenerator> slowPathGenerator)
{
m_slowPathGenerators.append(slowPathGenerator);
}
void SpeculativeJIT::runSlowPathGenerators()
{
for (unsigned i = 0; i < m_slowPathGenerators.size(); ++i)
m_slowPathGenerators[i]->generate(this);
}
// On Windows we need to wrap fmod; on other platforms we can call it directly.
// On ARMv7 we assert that all function pointers have to low bit set (point to thumb code).
#if CALLING_CONVENTION_IS_STDCALL || CPU(ARM_THUMB2)
static double JIT_OPERATION fmodAsDFGOperation(double x, double y)
{
return fmod(x, y);
}
#else
#define fmodAsDFGOperation fmod
#endif
void SpeculativeJIT::clearGenerationInfo()
{
for (unsigned i = 0; i < m_generationInfo.size(); ++i)
m_generationInfo[i] = GenerationInfo();
m_gprs = RegisterBank<GPRInfo>();
m_fprs = RegisterBank<FPRInfo>();
}
SilentRegisterSavePlan SpeculativeJIT::silentSavePlanForGPR(VirtualRegister spillMe, GPRReg source)
{
GenerationInfo& info = generationInfoFromVirtualRegister(spillMe);
Node* node = info.node();
DataFormat registerFormat = info.registerFormat();
ASSERT(registerFormat != DataFormatNone);
ASSERT(registerFormat != DataFormatDouble);
SilentSpillAction spillAction;
SilentFillAction fillAction;
if (!info.needsSpill())
spillAction = DoNothingForSpill;
else {
#if USE(JSVALUE64)
ASSERT(info.gpr() == source);
if (registerFormat == DataFormatInt32)
spillAction = Store32Payload;
else if (registerFormat == DataFormatCell || registerFormat == DataFormatStorage)
spillAction = StorePtr;
else if (registerFormat == DataFormatInt52 || registerFormat == DataFormatStrictInt52)
spillAction = Store64;
else {
ASSERT(registerFormat & DataFormatJS);
spillAction = Store64;
}
#elif USE(JSVALUE32_64)
if (registerFormat & DataFormatJS) {
ASSERT(info.tagGPR() == source || info.payloadGPR() == source);
spillAction = source == info.tagGPR() ? Store32Tag : Store32Payload;
} else {
ASSERT(info.gpr() == source);
spillAction = Store32Payload;
}
#endif
}
if (registerFormat == DataFormatInt32) {
ASSERT(info.gpr() == source);
ASSERT(isJSInt32(info.registerFormat()));
if (node->hasConstant()) {
ASSERT(isInt32Constant(node));
fillAction = SetInt32Constant;
} else
fillAction = Load32Payload;
} else if (registerFormat == DataFormatBoolean) {
#if USE(JSVALUE64)
RELEASE_ASSERT_NOT_REACHED();
fillAction = DoNothingForFill;
#elif USE(JSVALUE32_64)
ASSERT(info.gpr() == source);
if (node->hasConstant()) {
ASSERT(isBooleanConstant(node));
fillAction = SetBooleanConstant;
} else
fillAction = Load32Payload;
#endif
} else if (registerFormat == DataFormatCell) {
ASSERT(info.gpr() == source);
if (node->hasConstant()) {
JSValue value = valueOfJSConstant(node);
ASSERT_UNUSED(value, value.isCell());
fillAction = SetCellConstant;
} else {
#if USE(JSVALUE64)
fillAction = LoadPtr;
#else
fillAction = Load32Payload;
#endif
}
} else if (registerFormat == DataFormatStorage) {
ASSERT(info.gpr() == source);
fillAction = LoadPtr;
} else if (registerFormat == DataFormatInt52) {
if (node->hasConstant())
fillAction = SetInt52Constant;
else if (info.spillFormat() == DataFormatInt52)
fillAction = Load64;
else if (info.spillFormat() == DataFormatStrictInt52)
fillAction = Load64ShiftInt52Left;
else if (info.spillFormat() == DataFormatNone)
fillAction = Load64;
else {
RELEASE_ASSERT_NOT_REACHED();
fillAction = Load64; // Make GCC happy.
}
} else if (registerFormat == DataFormatStrictInt52) {
if (node->hasConstant())
fillAction = SetStrictInt52Constant;
else if (info.spillFormat() == DataFormatInt52)
fillAction = Load64ShiftInt52Right;
else if (info.spillFormat() == DataFormatStrictInt52)
fillAction = Load64;
else if (info.spillFormat() == DataFormatNone)
fillAction = Load64;
else {
RELEASE_ASSERT_NOT_REACHED();
fillAction = Load64; // Make GCC happy.
}
} else {
ASSERT(registerFormat & DataFormatJS);
#if USE(JSVALUE64)
ASSERT(info.gpr() == source);
if (node->hasConstant()) {
if (valueOfJSConstant(node).isCell())
fillAction = SetTrustedJSConstant;
fillAction = SetJSConstant;
} else if (info.spillFormat() == DataFormatInt32) {
ASSERT(registerFormat == DataFormatJSInt32);
fillAction = Load32PayloadBoxInt;
} else
fillAction = Load64;
#else
ASSERT(info.tagGPR() == source || info.payloadGPR() == source);
if (node->hasConstant())
fillAction = info.tagGPR() == source ? SetJSConstantTag : SetJSConstantPayload;
else if (info.payloadGPR() == source)
fillAction = Load32Payload;
else { // Fill the Tag
switch (info.spillFormat()) {
case DataFormatInt32:
ASSERT(registerFormat == DataFormatJSInt32);
fillAction = SetInt32Tag;
break;
case DataFormatCell:
ASSERT(registerFormat == DataFormatJSCell);
fillAction = SetCellTag;
break;
case DataFormatBoolean:
ASSERT(registerFormat == DataFormatJSBoolean);
fillAction = SetBooleanTag;
break;
default:
fillAction = Load32Tag;
break;
}
}
#endif
}
return SilentRegisterSavePlan(spillAction, fillAction, node, source);
}
SilentRegisterSavePlan SpeculativeJIT::silentSavePlanForFPR(VirtualRegister spillMe, FPRReg source)
{
GenerationInfo& info = generationInfoFromVirtualRegister(spillMe);
Node* node = info.node();
ASSERT(info.registerFormat() == DataFormatDouble);
SilentSpillAction spillAction;
SilentFillAction fillAction;
if (!info.needsSpill())
spillAction = DoNothingForSpill;
else {
ASSERT(!node->hasConstant());
ASSERT(info.spillFormat() == DataFormatNone);
ASSERT(info.fpr() == source);
spillAction = StoreDouble;
}
#if USE(JSVALUE64)
if (node->hasConstant()) {
ASSERT(isNumberConstant(node));
fillAction = SetDoubleConstant;
} else {
ASSERT(info.spillFormat() == DataFormatNone || info.spillFormat() == DataFormatDouble);
fillAction = LoadDouble;
}
#elif USE(JSVALUE32_64)
ASSERT(info.registerFormat() == DataFormatDouble);
if (node->hasConstant()) {
ASSERT(isNumberConstant(node));
fillAction = SetDoubleConstant;
} else
fillAction = LoadDouble;
#endif
return SilentRegisterSavePlan(spillAction, fillAction, node, source);
}
void SpeculativeJIT::silentSpill(const SilentRegisterSavePlan& plan)
{
switch (plan.spillAction()) {
case DoNothingForSpill:
break;
case Store32Tag:
m_jit.store32(plan.gpr(), JITCompiler::tagFor(plan.node()->virtualRegister()));
break;
case Store32Payload:
m_jit.store32(plan.gpr(), JITCompiler::payloadFor(plan.node()->virtualRegister()));
break;
case StorePtr:
m_jit.storePtr(plan.gpr(), JITCompiler::addressFor(plan.node()->virtualRegister()));
break;
#if USE(JSVALUE64)
case Store64:
m_jit.store64(plan.gpr(), JITCompiler::addressFor(plan.node()->virtualRegister()));
break;
#endif
case StoreDouble:
m_jit.storeDouble(plan.fpr(), JITCompiler::addressFor(plan.node()->virtualRegister()));
break;
default:
RELEASE_ASSERT_NOT_REACHED();
}
}
void SpeculativeJIT::silentFill(const SilentRegisterSavePlan& plan, GPRReg canTrample)
{
#if USE(JSVALUE32_64)
UNUSED_PARAM(canTrample);
#endif
switch (plan.fillAction()) {
case DoNothingForFill:
break;
case SetInt32Constant:
m_jit.move(Imm32(valueOfInt32Constant(plan.node())), plan.gpr());
break;
#if USE(JSVALUE64)
case SetInt52Constant:
m_jit.move(Imm64(valueOfJSConstant(plan.node()).asMachineInt() << JSValue::int52ShiftAmount), plan.gpr());
break;
case SetStrictInt52Constant:
m_jit.move(Imm64(valueOfJSConstant(plan.node()).asMachineInt()), plan.gpr());
break;
#endif // USE(JSVALUE64)
case SetBooleanConstant:
m_jit.move(TrustedImm32(valueOfBooleanConstant(plan.node())), plan.gpr());
break;
case SetCellConstant:
m_jit.move(TrustedImmPtr(valueOfJSConstant(plan.node()).asCell()), plan.gpr());
break;
#if USE(JSVALUE64)
case SetTrustedJSConstant:
m_jit.move(valueOfJSConstantAsImm64(plan.node()).asTrustedImm64(), plan.gpr());
break;
case SetJSConstant:
m_jit.move(valueOfJSConstantAsImm64(plan.node()), plan.gpr());
break;
case SetDoubleConstant:
m_jit.move(Imm64(reinterpretDoubleToInt64(valueOfNumberConstant(plan.node()))), canTrample);
m_jit.move64ToDouble(canTrample, plan.fpr());
break;
case Load32PayloadBoxInt:
m_jit.load32(JITCompiler::payloadFor(plan.node()->virtualRegister()), plan.gpr());
m_jit.or64(GPRInfo::tagTypeNumberRegister, plan.gpr());
break;
case Load32PayloadConvertToInt52:
m_jit.load32(JITCompiler::payloadFor(plan.node()->virtualRegister()), plan.gpr());
m_jit.signExtend32ToPtr(plan.gpr(), plan.gpr());
m_jit.lshift64(TrustedImm32(JSValue::int52ShiftAmount), plan.gpr());
break;
case Load32PayloadSignExtend:
m_jit.load32(JITCompiler::payloadFor(plan.node()->virtualRegister()), plan.gpr());
m_jit.signExtend32ToPtr(plan.gpr(), plan.gpr());
break;
#else
case SetJSConstantTag:
m_jit.move(Imm32(valueOfJSConstant(plan.node()).tag()), plan.gpr());
break;
case SetJSConstantPayload:
m_jit.move(Imm32(valueOfJSConstant(plan.node()).payload()), plan.gpr());
break;
case SetInt32Tag:
m_jit.move(TrustedImm32(JSValue::Int32Tag), plan.gpr());
break;
case SetCellTag:
m_jit.move(TrustedImm32(JSValue::CellTag), plan.gpr());
break;
case SetBooleanTag:
m_jit.move(TrustedImm32(JSValue::BooleanTag), plan.gpr());
break;
case SetDoubleConstant:
m_jit.loadDouble(TrustedImmPtr(addressOfDoubleConstant(plan.node())), plan.fpr());
break;
#endif
case Load32Tag:
m_jit.load32(JITCompiler::tagFor(plan.node()->virtualRegister()), plan.gpr());
break;
case Load32Payload:
m_jit.load32(JITCompiler::payloadFor(plan.node()->virtualRegister()), plan.gpr());
break;
case LoadPtr:
m_jit.loadPtr(JITCompiler::addressFor(plan.node()->virtualRegister()), plan.gpr());
break;
#if USE(JSVALUE64)
case Load64:
m_jit.load64(JITCompiler::addressFor(plan.node()->virtualRegister()), plan.gpr());
break;
case Load64ShiftInt52Right:
m_jit.load64(JITCompiler::addressFor(plan.node()->virtualRegister()), plan.gpr());
m_jit.rshift64(TrustedImm32(JSValue::int52ShiftAmount), plan.gpr());
break;
case Load64ShiftInt52Left:
m_jit.load64(JITCompiler::addressFor(plan.node()->virtualRegister()), plan.gpr());
m_jit.lshift64(TrustedImm32(JSValue::int52ShiftAmount), plan.gpr());
break;
#endif
case LoadDouble:
m_jit.loadDouble(JITCompiler::addressFor(plan.node()->virtualRegister()), plan.fpr());
break;
default:
RELEASE_ASSERT_NOT_REACHED();
}
}
JITCompiler::Jump SpeculativeJIT::jumpSlowForUnwantedArrayMode(GPRReg tempGPR, ArrayMode arrayMode, IndexingType shape)
{
switch (arrayMode.arrayClass()) {
case Array::OriginalArray: {
CRASH();
JITCompiler::Jump result; // I already know that VC++ takes unkindly to the expression "return Jump()", so I'm doing it this way in anticipation of someone eventually using VC++ to compile the DFG.
return result;
}
case Array::Array:
m_jit.and32(TrustedImm32(IsArray | IndexingShapeMask), tempGPR);
return m_jit.branch32(
MacroAssembler::NotEqual, tempGPR, TrustedImm32(IsArray | shape));
case Array::NonArray:
case Array::OriginalNonArray:
m_jit.and32(TrustedImm32(IsArray | IndexingShapeMask), tempGPR);
return m_jit.branch32(
MacroAssembler::NotEqual, tempGPR, TrustedImm32(shape));
case Array::PossiblyArray:
m_jit.and32(TrustedImm32(IndexingShapeMask), tempGPR);
return m_jit.branch32(MacroAssembler::NotEqual, tempGPR, TrustedImm32(shape));
}
RELEASE_ASSERT_NOT_REACHED();
return JITCompiler::Jump();
}
JITCompiler::JumpList SpeculativeJIT::jumpSlowForUnwantedArrayMode(GPRReg tempGPR, ArrayMode arrayMode)
{
JITCompiler::JumpList result;
switch (arrayMode.type()) {
case Array::Int32:
return jumpSlowForUnwantedArrayMode(tempGPR, arrayMode, Int32Shape);
case Array::Double:
return jumpSlowForUnwantedArrayMode(tempGPR, arrayMode, DoubleShape);
case Array::Contiguous:
return jumpSlowForUnwantedArrayMode(tempGPR, arrayMode, ContiguousShape);
case Array::ArrayStorage:
case Array::SlowPutArrayStorage: {
ASSERT(!arrayMode.isJSArrayWithOriginalStructure());
if (arrayMode.isJSArray()) {
if (arrayMode.isSlowPut()) {
result.append(
m_jit.branchTest32(
MacroAssembler::Zero, tempGPR, MacroAssembler::TrustedImm32(IsArray)));
m_jit.and32(TrustedImm32(IndexingShapeMask), tempGPR);
m_jit.sub32(TrustedImm32(ArrayStorageShape), tempGPR);
result.append(
m_jit.branch32(
MacroAssembler::Above, tempGPR,
TrustedImm32(SlowPutArrayStorageShape - ArrayStorageShape)));
break;
}
m_jit.and32(TrustedImm32(IsArray | IndexingShapeMask), tempGPR);
result.append(
m_jit.branch32(MacroAssembler::NotEqual, tempGPR, TrustedImm32(IsArray | ArrayStorageShape)));
break;
}
m_jit.and32(TrustedImm32(IndexingShapeMask), tempGPR);
if (arrayMode.isSlowPut()) {
m_jit.sub32(TrustedImm32(ArrayStorageShape), tempGPR);
result.append(
m_jit.branch32(
MacroAssembler::Above, tempGPR,
TrustedImm32(SlowPutArrayStorageShape - ArrayStorageShape)));
break;
}
result.append(
m_jit.branch32(MacroAssembler::NotEqual, tempGPR, TrustedImm32(ArrayStorageShape)));
break;
}
default:
CRASH();
break;
}
return result;
}
void SpeculativeJIT::checkArray(Node* node)
{
ASSERT(node->arrayMode().isSpecific());
ASSERT(!node->arrayMode().doesConversion());
SpeculateCellOperand base(this, node->child1());
GPRReg baseReg = base.gpr();
if (node->arrayMode().alreadyChecked(m_jit.graph(), node, m_state.forNode(node->child1()))) {
noResult(m_currentNode);
return;
}
const ClassInfo* expectedClassInfo = 0;
switch (node->arrayMode().type()) {
case Array::String:
RELEASE_ASSERT_NOT_REACHED(); // Should have been a Phantom(String:)
break;
case Array::Int32:
case Array::Double:
case Array::Contiguous:
case Array::ArrayStorage:
case Array::SlowPutArrayStorage: {
GPRTemporary temp(this);
GPRReg tempGPR = temp.gpr();
m_jit.load8(MacroAssembler::Address(baseReg, JSCell::indexingTypeOffset()), tempGPR);
speculationCheck(
BadIndexingType, JSValueSource::unboxedCell(baseReg), 0,
jumpSlowForUnwantedArrayMode(tempGPR, node->arrayMode()));
noResult(m_currentNode);
return;
}
case Array::Arguments:
speculationCheck(BadType, JSValueSource::unboxedCell(baseReg), node,
m_jit.branch8(
MacroAssembler::NotEqual,
MacroAssembler::Address(baseReg, JSCell::typeInfoTypeOffset()),
MacroAssembler::TrustedImm32(ArgumentsType)));
noResult(m_currentNode);
return;
default:
speculationCheck(BadType, JSValueSource::unboxedCell(baseReg), node,
m_jit.branch8(
MacroAssembler::NotEqual,
MacroAssembler::Address(baseReg, JSCell::typeInfoTypeOffset()),
MacroAssembler::TrustedImm32(typeForTypedArrayType(node->arrayMode().typedArrayType()))));
noResult(m_currentNode);
return;
}
RELEASE_ASSERT(expectedClassInfo);
GPRTemporary temp(this);
GPRTemporary temp2(this);
m_jit.emitLoadStructure(baseReg, temp.gpr(), temp2.gpr());
speculationCheck(
BadType, JSValueSource::unboxedCell(baseReg), node,
m_jit.branchPtr(
MacroAssembler::NotEqual,
MacroAssembler::Address(temp.gpr(), Structure::classInfoOffset()),
MacroAssembler::TrustedImmPtr(expectedClassInfo)));
noResult(m_currentNode);
}
void SpeculativeJIT::arrayify(Node* node, GPRReg baseReg, GPRReg propertyReg)
{
ASSERT(node->arrayMode().doesConversion());
GPRTemporary temp(this);
GPRTemporary structure;
GPRReg tempGPR = temp.gpr();
GPRReg structureGPR = InvalidGPRReg;
if (node->op() != ArrayifyToStructure) {
GPRTemporary realStructure(this);
structure.adopt(realStructure);
structureGPR = structure.gpr();
}
// We can skip all that comes next if we already have array storage.
MacroAssembler::JumpList slowPath;
if (node->op() == ArrayifyToStructure) {
slowPath.append(m_jit.branchWeakStructure(
JITCompiler::NotEqual,
JITCompiler::Address(baseReg, JSCell::structureIDOffset()),
node->structure()));
} else {
m_jit.load8(
MacroAssembler::Address(baseReg, JSCell::indexingTypeOffset()), tempGPR);
slowPath.append(jumpSlowForUnwantedArrayMode(tempGPR, node->arrayMode()));
}
addSlowPathGenerator(adoptPtr(new ArrayifySlowPathGenerator(
slowPath, this, node, baseReg, propertyReg, tempGPR, structureGPR)));
noResult(m_currentNode);
}
void SpeculativeJIT::arrayify(Node* node)
{
ASSERT(node->arrayMode().isSpecific());
SpeculateCellOperand base(this, node->child1());
if (!node->child2()) {
arrayify(node, base.gpr(), InvalidGPRReg);
return;
}
SpeculateInt32Operand property(this, node->child2());
arrayify(node, base.gpr(), property.gpr());
}
GPRReg SpeculativeJIT::fillStorage(Edge edge)
{
VirtualRegister virtualRegister = edge->virtualRegister();
GenerationInfo& info = generationInfoFromVirtualRegister(virtualRegister);
switch (info.registerFormat()) {
case DataFormatNone: {
if (info.spillFormat() == DataFormatStorage) {
GPRReg gpr = allocate();
m_gprs.retain(gpr, virtualRegister, SpillOrderSpilled);
m_jit.loadPtr(JITCompiler::addressFor(virtualRegister), gpr);
info.fillStorage(*m_stream, gpr);
return gpr;
}
// Must be a cell; fill it as a cell and then return the pointer.
return fillSpeculateCell(edge);
}
case DataFormatStorage: {
GPRReg gpr = info.gpr();
m_gprs.lock(gpr);
return gpr;
}
default:
return fillSpeculateCell(edge);
}
}
void SpeculativeJIT::useChildren(Node* node)
{
if (node->flags() & NodeHasVarArgs) {
for (unsigned childIdx = node->firstChild(); childIdx < node->firstChild() + node->numChildren(); childIdx++) {
if (!!m_jit.graph().m_varArgChildren[childIdx])
use(m_jit.graph().m_varArgChildren[childIdx]);
}
} else {
Edge child1 = node->child1();
if (!child1) {
ASSERT(!node->child2() && !node->child3());
return;
}
use(child1);
Edge child2 = node->child2();
if (!child2) {
ASSERT(!node->child3());
return;
}
use(child2);
Edge child3 = node->child3();
if (!child3)
return;
use(child3);
}
}
void SpeculativeJIT::compileIn(Node* node)
{
SpeculateCellOperand base(this, node->child2());
GPRReg baseGPR = base.gpr();
if (isConstant(node->child1().node())) {
JSString* string =
jsDynamicCast<JSString*>(valueOfJSConstant(node->child1().node()));
if (string && string->tryGetValueImpl()
&& string->tryGetValueImpl()->isAtomic()) {
StructureStubInfo* stubInfo = m_jit.codeBlock()->addStubInfo();
GPRTemporary result(this);
GPRReg resultGPR = result.gpr();
use(node->child1());
MacroAssembler::PatchableJump jump = m_jit.patchableJump();
MacroAssembler::Label done = m_jit.label();
OwnPtr<SlowPathGenerator> slowPath = slowPathCall(
jump.m_jump, this, operationInOptimize,
JSValueRegs::payloadOnly(resultGPR), stubInfo, baseGPR,
string->tryGetValueImpl());
stubInfo->codeOrigin = node->origin.semantic;
stubInfo->patch.baseGPR = static_cast<int8_t>(baseGPR);
stubInfo->patch.valueGPR = static_cast<int8_t>(resultGPR);
stubInfo->patch.usedRegisters = usedRegisters();
stubInfo->patch.spillMode = NeedToSpill;
m_jit.addIn(InRecord(jump, done, slowPath.get(), stubInfo));
addSlowPathGenerator(slowPath.release());
base.use();
blessedBooleanResult(resultGPR, node, UseChildrenCalledExplicitly);
return;
}
}
JSValueOperand key(this, node->child1());
JSValueRegs regs = key.jsValueRegs();
GPRResult result(this);
GPRReg resultGPR = result.gpr();
base.use();
key.use();
flushRegisters();
callOperation(
operationGenericIn, extractResult(JSValueRegs::payloadOnly(resultGPR)),
baseGPR, regs);
blessedBooleanResult(resultGPR, node, UseChildrenCalledExplicitly);
}
bool SpeculativeJIT::nonSpeculativeCompare(Node* node, MacroAssembler::RelationalCondition cond, S_JITOperation_EJJ helperFunction)
{
unsigned branchIndexInBlock = detectPeepHoleBranch();
if (branchIndexInBlock != UINT_MAX) {
Node* branchNode = m_block->at(branchIndexInBlock);
ASSERT(node->adjustedRefCount() == 1);
nonSpeculativePeepholeBranch(node, branchNode, cond, helperFunction);
m_indexInBlock = branchIndexInBlock;
m_currentNode = branchNode;
return true;
}
nonSpeculativeNonPeepholeCompare(node, cond, helperFunction);
return false;
}
bool SpeculativeJIT::nonSpeculativeStrictEq(Node* node, bool invert)
{
unsigned branchIndexInBlock = detectPeepHoleBranch();
if (branchIndexInBlock != UINT_MAX) {
Node* branchNode = m_block->at(branchIndexInBlock);
ASSERT(node->adjustedRefCount() == 1);
nonSpeculativePeepholeStrictEq(node, branchNode, invert);
m_indexInBlock = branchIndexInBlock;
m_currentNode = branchNode;
return true;
}
nonSpeculativeNonPeepholeStrictEq(node, invert);
return false;
}
static const char* dataFormatString(DataFormat format)
{
// These values correspond to the DataFormat enum.
const char* strings[] = {
"[ ]",
"[ i]",
"[ d]",
"[ c]",
"Err!",
"Err!",
"Err!",
"Err!",
"[J ]",
"[Ji]",
"[Jd]",
"[Jc]",
"Err!",
"Err!",
"Err!",
"Err!",
};
return strings[format];
}
void SpeculativeJIT::dump(const char* label)
{
if (label)
dataLogF("<%s>\n", label);
dataLogF(" gprs:\n");
m_gprs.dump();
dataLogF(" fprs:\n");
m_fprs.dump();
dataLogF(" VirtualRegisters:\n");
for (unsigned i = 0; i < m_generationInfo.size(); ++i) {
GenerationInfo& info = m_generationInfo[i];
if (info.alive())
dataLogF(" % 3d:%s%s", i, dataFormatString(info.registerFormat()), dataFormatString(info.spillFormat()));
else
dataLogF(" % 3d:[__][__]", i);
if (info.registerFormat() == DataFormatDouble)
dataLogF(":fpr%d\n", info.fpr());
else if (info.registerFormat() != DataFormatNone
#if USE(JSVALUE32_64)
&& !(info.registerFormat() & DataFormatJS)
#endif
) {
ASSERT(info.gpr() != InvalidGPRReg);
dataLogF(":%s\n", GPRInfo::debugName(info.gpr()));
} else
dataLogF("\n");
}
if (label)
dataLogF("</%s>\n", label);
}
GPRTemporary::GPRTemporary()
: m_jit(0)
, m_gpr(InvalidGPRReg)
{
}
GPRTemporary::GPRTemporary(SpeculativeJIT* jit)
: m_jit(jit)
, m_gpr(InvalidGPRReg)
{
m_gpr = m_jit->allocate();
}
GPRTemporary::GPRTemporary(SpeculativeJIT* jit, GPRReg specific)
: m_jit(jit)
, m_gpr(InvalidGPRReg)
{
m_gpr = m_jit->allocate(specific);
}
#if USE(JSVALUE32_64)
GPRTemporary::GPRTemporary(
SpeculativeJIT* jit, ReuseTag, JSValueOperand& op1, WhichValueWord which)
: m_jit(jit)
, m_gpr(InvalidGPRReg)
{
if (!op1.isDouble() && m_jit->canReuse(op1.node()))
m_gpr = m_jit->reuse(op1.gpr(which));
else
m_gpr = m_jit->allocate();
}
#endif // USE(JSVALUE32_64)
JSValueRegsTemporary::JSValueRegsTemporary() { }
JSValueRegsTemporary::JSValueRegsTemporary(SpeculativeJIT* jit)
#if USE(JSVALUE64)
: m_gpr(jit)
#else
: m_payloadGPR(jit)
, m_tagGPR(jit)
#endif
{
}
JSValueRegsTemporary::~JSValueRegsTemporary() { }
JSValueRegs JSValueRegsTemporary::regs()
{
#if USE(JSVALUE64)
return JSValueRegs(m_gpr.gpr());
#else
return JSValueRegs(m_tagGPR.gpr(), m_payloadGPR.gpr());
#endif
}
void GPRTemporary::adopt(GPRTemporary& other)
{
ASSERT(!m_jit);
ASSERT(m_gpr == InvalidGPRReg);
ASSERT(other.m_jit);
ASSERT(other.m_gpr != InvalidGPRReg);
m_jit = other.m_jit;
m_gpr = other.m_gpr;
other.m_jit = 0;
other.m_gpr = InvalidGPRReg;
}
FPRTemporary::FPRTemporary(SpeculativeJIT* jit)
: m_jit(jit)
, m_fpr(InvalidFPRReg)
{
m_fpr = m_jit->fprAllocate();
}
FPRTemporary::FPRTemporary(SpeculativeJIT* jit, SpeculateDoubleOperand& op1)
: m_jit(jit)
, m_fpr(InvalidFPRReg)
{
if (m_jit->canReuse(op1.node()))
m_fpr = m_jit->reuse(op1.fpr());
else
m_fpr = m_jit->fprAllocate();
}
FPRTemporary::FPRTemporary(SpeculativeJIT* jit, SpeculateDoubleOperand& op1, SpeculateDoubleOperand& op2)
: m_jit(jit)
, m_fpr(InvalidFPRReg)
{
if (m_jit->canReuse(op1.node()))
m_fpr = m_jit->reuse(op1.fpr());
else if (m_jit->canReuse(op2.node()))
m_fpr = m_jit->reuse(op2.fpr());
else
m_fpr = m_jit->fprAllocate();
}
#if USE(JSVALUE32_64)
FPRTemporary::FPRTemporary(SpeculativeJIT* jit, JSValueOperand& op1)
: m_jit(jit)
, m_fpr(InvalidFPRReg)
{
if (op1.isDouble() && m_jit->canReuse(op1.node()))
m_fpr = m_jit->reuse(op1.fpr());
else
m_fpr = m_jit->fprAllocate();
}
#endif
void SpeculativeJIT::compilePeepHoleDoubleBranch(Node* node, Node* branchNode, JITCompiler::DoubleCondition condition)
{
BasicBlock* taken = branchNode->branchData()->taken.block;
BasicBlock* notTaken = branchNode->branchData()->notTaken.block;
SpeculateDoubleOperand op1(this, node->child1());
SpeculateDoubleOperand op2(this, node->child2());
branchDouble(condition, op1.fpr(), op2.fpr(), taken);
jump(notTaken);
}
void SpeculativeJIT::compilePeepHoleObjectEquality(Node* node, Node* branchNode)
{
BasicBlock* taken = branchNode->branchData()->taken.block;
BasicBlock* notTaken = branchNode->branchData()->notTaken.block;
MacroAssembler::RelationalCondition condition = MacroAssembler::Equal;
if (taken == nextBlock()) {
condition = MacroAssembler::NotEqual;
BasicBlock* tmp = taken;
taken = notTaken;
notTaken = tmp;
}
SpeculateCellOperand op1(this, node->child1());
SpeculateCellOperand op2(this, node->child2());
GPRReg op1GPR = op1.gpr();
GPRReg op2GPR = op2.gpr();
if (masqueradesAsUndefinedWatchpointIsStillValid()) {
if (m_state.forNode(node->child1()).m_type & ~SpecObject) {
speculationCheck(
BadType, JSValueSource::unboxedCell(op1GPR), node->child1(),
m_jit.branchStructurePtr(
MacroAssembler::Equal,
MacroAssembler::Address(op1GPR, JSCell::structureIDOffset()),
m_jit.vm()->stringStructure.get()));
}
if (m_state.forNode(node->child2()).m_type & ~SpecObject) {
speculationCheck(
BadType, JSValueSource::unboxedCell(op2GPR), node->child2(),
m_jit.branchStructurePtr(
MacroAssembler::Equal,
MacroAssembler::Address(op2GPR, JSCell::structureIDOffset()),
m_jit.vm()->stringStructure.get()));
}
} else {
GPRTemporary structure(this);
GPRTemporary temp(this);
GPRReg structureGPR = structure.gpr();
m_jit.emitLoadStructure(op1GPR, structureGPR, temp.gpr());
if (m_state.forNode(node->child1()).m_type & ~SpecObject) {
speculationCheck(
BadType, JSValueSource::unboxedCell(op1GPR), node->child1(),
m_jit.branchPtr(
MacroAssembler::Equal,
structureGPR,
MacroAssembler::TrustedImmPtr(m_jit.vm()->stringStructure.get())));
}
speculationCheck(BadType, JSValueSource::unboxedCell(op1GPR), node->child1(),
m_jit.branchTest8(
MacroAssembler::NonZero,
MacroAssembler::Address(op1GPR, JSCell::typeInfoFlagsOffset()),
MacroAssembler::TrustedImm32(MasqueradesAsUndefined)));
m_jit.emitLoadStructure(op2GPR, structureGPR, temp.gpr());
if (m_state.forNode(node->child2()).m_type & ~SpecObject) {
speculationCheck(
BadType, JSValueSource::unboxedCell(op2GPR), node->child2(),
m_jit.branchPtr(
MacroAssembler::Equal,
structureGPR,
MacroAssembler::TrustedImmPtr(m_jit.vm()->stringStructure.get())));
}
speculationCheck(BadType, JSValueSource::unboxedCell(op2GPR), node->child2(),
m_jit.branchTest8(
MacroAssembler::NonZero,
MacroAssembler::Address(op2GPR, JSCell::typeInfoFlagsOffset()),
MacroAssembler::TrustedImm32(MasqueradesAsUndefined)));
}
branchPtr(condition, op1GPR, op2GPR, taken);
jump(notTaken);
}
void SpeculativeJIT::compilePeepHoleBooleanBranch(Node* node, Node* branchNode, JITCompiler::RelationalCondition condition)
{
BasicBlock* taken = branchNode->branchData()->taken.block;
BasicBlock* notTaken = branchNode->branchData()->notTaken.block;
// The branch instruction will branch to the taken block.
// If taken is next, switch taken with notTaken & invert the branch condition so we can fall through.
if (taken == nextBlock()) {
condition = JITCompiler::invert(condition);
BasicBlock* tmp = taken;
taken = notTaken;
notTaken = tmp;
}
if (isBooleanConstant(node->child1().node())) {
bool imm = valueOfBooleanConstant(node->child1().node());
SpeculateBooleanOperand op2(this, node->child2());
branch32(condition, JITCompiler::Imm32(static_cast<int32_t>(JSValue::encode(jsBoolean(imm)))), op2.gpr(), taken);
} else if (isBooleanConstant(node->child2().node())) {
SpeculateBooleanOperand op1(this, node->child1());
bool imm = valueOfBooleanConstant(node->child2().node());
branch32(condition, op1.gpr(), JITCompiler::Imm32(static_cast<int32_t>(JSValue::encode(jsBoolean(imm)))), taken);
} else {
SpeculateBooleanOperand op1(this, node->child1());
SpeculateBooleanOperand op2(this, node->child2());
branch32(condition, op1.gpr(), op2.gpr(), taken);
}
jump(notTaken);
}
void SpeculativeJIT::compilePeepHoleInt32Branch(Node* node, Node* branchNode, JITCompiler::RelationalCondition condition)
{
BasicBlock* taken = branchNode->branchData()->taken.block;
BasicBlock* notTaken = branchNode->branchData()->notTaken.block;
// The branch instruction will branch to the taken block.
// If taken is next, switch taken with notTaken & invert the branch condition so we can fall through.
if (taken == nextBlock()) {
condition = JITCompiler::invert(condition);
BasicBlock* tmp = taken;
taken = notTaken;
notTaken = tmp;
}
if (isInt32Constant(node->child1().node())) {
int32_t imm = valueOfInt32Constant(node->child1().node());
SpeculateInt32Operand op2(this, node->child2());
branch32(condition, JITCompiler::Imm32(imm), op2.gpr(), taken);
} else if (isInt32Constant(node->child2().node())) {
SpeculateInt32Operand op1(this, node->child1());
int32_t imm = valueOfInt32Constant(node->child2().node());
branch32(condition, op1.gpr(), JITCompiler::Imm32(imm), taken);
} else {
SpeculateInt32Operand op1(this, node->child1());
SpeculateInt32Operand op2(this, node->child2());
branch32(condition, op1.gpr(), op2.gpr(), taken);
}
jump(notTaken);
}
// Returns true if the compare is fused with a subsequent branch.
bool SpeculativeJIT::compilePeepHoleBranch(Node* node, MacroAssembler::RelationalCondition condition, MacroAssembler::DoubleCondition doubleCondition, S_JITOperation_EJJ operation)
{
// Fused compare & branch.
unsigned branchIndexInBlock = detectPeepHoleBranch();
if (branchIndexInBlock != UINT_MAX) {
Node* branchNode = m_block->at(branchIndexInBlock);
// detectPeepHoleBranch currently only permits the branch to be the very next node,
// so can be no intervening nodes to also reference the compare.
ASSERT(node->adjustedRefCount() == 1);
if (node->isBinaryUseKind(Int32Use))
compilePeepHoleInt32Branch(node, branchNode, condition);
#if USE(JSVALUE64)
else if (node->isBinaryUseKind(Int52RepUse))
compilePeepHoleInt52Branch(node, branchNode, condition);
#endif // USE(JSVALUE64)
else if (node->isBinaryUseKind(DoubleRepUse))
compilePeepHoleDoubleBranch(node, branchNode, doubleCondition);
else if (node->op() == CompareEq) {
if (node->isBinaryUseKind(StringUse) || node->isBinaryUseKind(StringIdentUse)) {
// Use non-peephole comparison, for now.
return false;
}
if (node->isBinaryUseKind(BooleanUse))
compilePeepHoleBooleanBranch(node, branchNode, condition);
else if (node->isBinaryUseKind(ObjectUse))
compilePeepHoleObjectEquality(node, branchNode);
else if (node->isBinaryUseKind(ObjectUse, ObjectOrOtherUse))
compilePeepHoleObjectToObjectOrOtherEquality(node->child1(), node->child2(), branchNode);
else if (node->isBinaryUseKind(ObjectOrOtherUse, ObjectUse))
compilePeepHoleObjectToObjectOrOtherEquality(node->child2(), node->child1(), branchNode);
else {
nonSpeculativePeepholeBranch(node, branchNode, condition, operation);
return true;
}
} else {
nonSpeculativePeepholeBranch(node, branchNode, condition, operation);
return true;
}
use(node->child1());
use(node->child2());
m_indexInBlock = branchIndexInBlock;
m_currentNode = branchNode;
return true;
}
return false;
}
void SpeculativeJIT::noticeOSRBirth(Node* node)
{
if (!node->hasVirtualRegister())
return;
VirtualRegister virtualRegister = node->virtualRegister();
GenerationInfo& info = generationInfoFromVirtualRegister(virtualRegister);
info.noticeOSRBirth(*m_stream, node, virtualRegister);
}
void SpeculativeJIT::compileMovHint(Node* node)
{
ASSERT(node->containsMovHint() && node->op() != ZombieHint);
Node* child = node->child1().node();
noticeOSRBirth(child);
m_stream->appendAndLog(VariableEvent::movHint(MinifiedID(child), node->unlinkedLocal()));
}
void SpeculativeJIT::bail(AbortReason reason)
{
m_compileOkay = true;
m_jit.abortWithReason(reason, m_lastGeneratedNode);
clearGenerationInfo();
}
void SpeculativeJIT::compileCurrentBlock()
{
ASSERT(m_compileOkay);
if (!m_block)
return;
ASSERT(m_block->isReachable);
m_jit.blockHeads()[m_block->index] = m_jit.label();
if (!m_block->cfaHasVisited) {
// Don't generate code for basic blocks that are unreachable according to CFA.
// But to be sure that nobody has generated a jump to this block, drop in a
// breakpoint here.
m_jit.abortWithReason(DFGUnreachableBasicBlock);
return;
}
m_stream->appendAndLog(VariableEvent::reset());
m_jit.jitAssertHasValidCallFrame();
m_jit.jitAssertTagsInPlace();
m_jit.jitAssertArgumentCountSane();
m_state.reset();
m_state.beginBasicBlock(m_block);
for (size_t i = m_block->variablesAtHead.size(); i--;) {
int operand = m_block->variablesAtHead.operandForIndex(i);
Node* node = m_block->variablesAtHead[i];
if (!node)
continue; // No need to record dead SetLocal's.
VariableAccessData* variable = node->variableAccessData();
DataFormat format;
if (!node->refCount())
continue; // No need to record dead SetLocal's.
format = dataFormatFor(variable->flushFormat());
m_stream->appendAndLog(
VariableEvent::setLocal(
VirtualRegister(operand),
variable->machineLocal(),
format));
}
m_codeOriginForExitTarget = CodeOrigin();
m_codeOriginForExitProfile = CodeOrigin();
for (m_indexInBlock = 0; m_indexInBlock < m_block->size(); ++m_indexInBlock) {
m_currentNode = m_block->at(m_indexInBlock);
// We may have hit a contradiction that the CFA was aware of but that the JIT
// didn't cause directly.
if (!m_state.isValid()) {
bail(DFGBailedAtTopOfBlock);
return;
}
m_canExit = m_currentNode->canExit();
bool shouldExecuteEffects = m_interpreter.startExecuting(m_currentNode);
m_jit.setForNode(m_currentNode);
m_codeOriginForExitTarget = m_currentNode->origin.forExit;
m_codeOriginForExitProfile = m_currentNode->origin.semantic;
m_lastGeneratedNode = m_currentNode->op();
if (!m_currentNode->shouldGenerate()) {
switch (m_currentNode->op()) {
case JSConstant:
m_minifiedGraph->append(MinifiedNode::fromNode(m_currentNode));
break;
case WeakJSConstant:
m_jit.addWeakReference(m_currentNode->weakConstant());
m_minifiedGraph->append(MinifiedNode::fromNode(m_currentNode));
break;
case SetLocal:
RELEASE_ASSERT_NOT_REACHED();
break;
case MovHint:
compileMovHint(m_currentNode);
break;
case ZombieHint: {
recordSetLocal(m_currentNode->unlinkedLocal(), VirtualRegister(), DataFormatDead);
break;
}
default:
if (belongsInMinifiedGraph(m_currentNode->op()))
m_minifiedGraph->append(MinifiedNode::fromNode(m_currentNode));
break;
}
} else {
if (verboseCompilationEnabled()) {
dataLogF(
"SpeculativeJIT generating Node @%d (bc#%u) at JIT offset 0x%x",
(int)m_currentNode->index(),
m_currentNode->origin.semantic.bytecodeIndex, m_jit.debugOffset());
dataLog("\n");
}
compile(m_currentNode);
#if ENABLE(DFG_REGISTER_ALLOCATION_VALIDATION)
m_jit.clearRegisterAllocationOffsets();
#endif
if (!m_compileOkay) {
bail(DFGBailedAtEndOfNode);
return;
}
if (belongsInMinifiedGraph(m_currentNode->op())) {
m_minifiedGraph->append(MinifiedNode::fromNode(m_currentNode));
noticeOSRBirth(m_currentNode);
}
}
// Make sure that the abstract state is rematerialized for the next node.
if (shouldExecuteEffects)
m_interpreter.executeEffects(m_indexInBlock);
}
// Perform the most basic verification that children have been used correctly.
if (!ASSERT_DISABLED) {
for (unsigned index = 0; index < m_generationInfo.size(); ++index) {
GenerationInfo& info = m_generationInfo[index];
RELEASE_ASSERT(!info.alive());
}
}
}
// If we are making type predictions about our arguments then
// we need to check that they are correct on function entry.
void SpeculativeJIT::checkArgumentTypes()
{
ASSERT(!m_currentNode);
m_isCheckingArgumentTypes = true;
m_codeOriginForExitTarget = CodeOrigin(0);
m_codeOriginForExitProfile = CodeOrigin(0);
for (int i = 0; i < m_jit.codeBlock()->numParameters(); ++i) {
Node* node = m_jit.graph().m_arguments[i];
if (!node) {
// The argument is dead. We don't do any checks for such arguments.
continue;
}
ASSERT(node->op() == SetArgument);
ASSERT(node->shouldGenerate());
VariableAccessData* variableAccessData = node->variableAccessData();
FlushFormat format = variableAccessData->flushFormat();
if (format == FlushedJSValue)
continue;
VirtualRegister virtualRegister = variableAccessData->local();
JSValueSource valueSource = JSValueSource(JITCompiler::addressFor(virtualRegister));
#if USE(JSVALUE64)
switch (format) {
case FlushedInt32: {
speculationCheck(BadType, valueSource, node, m_jit.branch64(MacroAssembler::Below, JITCompiler::addressFor(virtualRegister), GPRInfo::tagTypeNumberRegister));
break;
}
case FlushedBoolean: {
GPRTemporary temp(this);
m_jit.load64(JITCompiler::addressFor(virtualRegister), temp.gpr());
m_jit.xor64(TrustedImm32(static_cast<int32_t>(ValueFalse)), temp.gpr());
speculationCheck(BadType, valueSource, node, m_jit.branchTest64(MacroAssembler::NonZero, temp.gpr(), TrustedImm32(static_cast<int32_t>(~1))));
break;
}
case FlushedCell: {
speculationCheck(BadType, valueSource, node, m_jit.branchTest64(MacroAssembler::NonZero, JITCompiler::addressFor(virtualRegister), GPRInfo::tagMaskRegister));
break;
}
default:
RELEASE_ASSERT_NOT_REACHED();
break;
}
#else
switch (format) {
case FlushedInt32: {
speculationCheck(BadType, valueSource, node, m_jit.branch32(MacroAssembler::NotEqual, JITCompiler::tagFor(virtualRegister), TrustedImm32(JSValue::Int32Tag)));
break;
}
case FlushedBoolean: {
speculationCheck(BadType, valueSource, node, m_jit.branch32(MacroAssembler::NotEqual, JITCompiler::tagFor(virtualRegister), TrustedImm32(JSValue::BooleanTag)));
break;
}
case FlushedCell: {
speculationCheck(BadType, valueSource, node, m_jit.branch32(MacroAssembler::NotEqual, JITCompiler::tagFor(virtualRegister), TrustedImm32(JSValue::CellTag)));
break;
}
default:
RELEASE_ASSERT_NOT_REACHED();
break;
}
#endif
}
m_isCheckingArgumentTypes = false;
}
bool SpeculativeJIT::compile()
{
checkArgumentTypes();
ASSERT(!m_currentNode);
for (BlockIndex blockIndex = 0; blockIndex < m_jit.graph().numBlocks(); ++blockIndex) {
m_jit.setForBlockIndex(blockIndex);
m_block = m_jit.graph().block(blockIndex);
compileCurrentBlock();
}
linkBranches();
return true;
}
void SpeculativeJIT::createOSREntries()
{
for (BlockIndex blockIndex = 0; blockIndex < m_jit.graph().numBlocks(); ++blockIndex) {
BasicBlock* block = m_jit.graph().block(blockIndex);
if (!block)
continue;
if (!block->isOSRTarget)
continue;
// Currently we don't have OSR entry trampolines. We could add them
// here if need be.
m_osrEntryHeads.append(m_jit.blockHeads()[blockIndex]);
}
}
void SpeculativeJIT::linkOSREntries(LinkBuffer& linkBuffer)
{
unsigned osrEntryIndex = 0;
for (BlockIndex blockIndex = 0; blockIndex < m_jit.graph().numBlocks(); ++blockIndex) {
BasicBlock* block = m_jit.graph().block(blockIndex);
if (!block)
continue;
if (!block->isOSRTarget)
continue;
m_jit.noticeOSREntry(*block, m_osrEntryHeads[osrEntryIndex++], linkBuffer);
}
ASSERT(osrEntryIndex == m_osrEntryHeads.size());
}
void SpeculativeJIT::compileDoublePutByVal(Node* node, SpeculateCellOperand& base, SpeculateStrictInt32Operand& property)
{
Edge child3 = m_jit.graph().varArgChild(node, 2);
Edge child4 = m_jit.graph().varArgChild(node, 3);
ArrayMode arrayMode = node->arrayMode();
GPRReg baseReg = base.gpr();
GPRReg propertyReg = property.gpr();
SpeculateDoubleOperand value(this, child3);
FPRReg valueReg = value.fpr();
DFG_TYPE_CHECK(
JSValueRegs(), child3, SpecFullRealNumber,
m_jit.branchDouble(
MacroAssembler::DoubleNotEqualOrUnordered, valueReg, valueReg));
if (!m_compileOkay)
return;
StorageOperand storage(this, child4);
GPRReg storageReg = storage.gpr();
if (node->op() == PutByValAlias) {
// Store the value to the array.
GPRReg propertyReg = property.gpr();
FPRReg valueReg = value.fpr();
m_jit.storeDouble(valueReg, MacroAssembler::BaseIndex(storageReg, propertyReg, MacroAssembler::TimesEight));
noResult(m_currentNode);
return;
}
GPRTemporary temporary;
GPRReg temporaryReg = temporaryRegisterForPutByVal(temporary, node);
MacroAssembler::Jump slowCase;
if (arrayMode.isInBounds()) {
speculationCheck(
OutOfBounds, JSValueRegs(), 0,
m_jit.branch32(MacroAssembler::AboveOrEqual, propertyReg, MacroAssembler::Address(storageReg, Butterfly::offsetOfPublicLength())));
} else {
MacroAssembler::Jump inBounds = m_jit.branch32(MacroAssembler::Below, propertyReg, MacroAssembler::Address(storageReg, Butterfly::offsetOfPublicLength()));
slowCase = m_jit.branch32(MacroAssembler::AboveOrEqual, propertyReg, MacroAssembler::Address(storageReg, Butterfly::offsetOfVectorLength()));
if (!arrayMode.isOutOfBounds())
speculationCheck(OutOfBounds, JSValueRegs(), 0, slowCase);
m_jit.add32(TrustedImm32(1), propertyReg, temporaryReg);
m_jit.store32(temporaryReg, MacroAssembler::Address(storageReg, Butterfly::offsetOfPublicLength()));
inBounds.link(&m_jit);
}
m_jit.storeDouble(valueReg, MacroAssembler::BaseIndex(storageReg, propertyReg, MacroAssembler::TimesEight));
base.use();
property.use();
value.use();
storage.use();
if (arrayMode.isOutOfBounds()) {
addSlowPathGenerator(
slowPathCall(
slowCase, this,
m_jit.codeBlock()->isStrictMode() ? operationPutDoubleByValBeyondArrayBoundsStrict : operationPutDoubleByValBeyondArrayBoundsNonStrict,
NoResult, baseReg, propertyReg, valueReg));
}
noResult(m_currentNode, UseChildrenCalledExplicitly);
}
void SpeculativeJIT::compileGetCharCodeAt(Node* node)
{
SpeculateCellOperand string(this, node->child1());
SpeculateStrictInt32Operand index(this, node->child2());
StorageOperand storage(this, node->child3());
GPRReg stringReg = string.gpr();
GPRReg indexReg = index.gpr();
GPRReg storageReg = storage.gpr();
ASSERT(speculationChecked(m_state.forNode(node->child1()).m_type, SpecString));
// unsigned comparison so we can filter out negative indices and indices that are too large
speculationCheck(Uncountable, JSValueRegs(), 0, m_jit.branch32(MacroAssembler::AboveOrEqual, indexReg, MacroAssembler::Address(stringReg, JSString::offsetOfLength())));
GPRTemporary scratch(this);
GPRReg scratchReg = scratch.gpr();
m_jit.loadPtr(MacroAssembler::Address(stringReg, JSString::offsetOfValue()), scratchReg);
// Load the character into scratchReg
JITCompiler::Jump is16Bit = m_jit.branchTest32(MacroAssembler::Zero, MacroAssembler::Address(scratchReg, StringImpl::flagsOffset()), TrustedImm32(StringImpl::flagIs8Bit()));
m_jit.load8(MacroAssembler::BaseIndex(storageReg, indexReg, MacroAssembler::TimesOne, 0), scratchReg);
JITCompiler::Jump cont8Bit = m_jit.jump();
is16Bit.link(&m_jit);
m_jit.load16(MacroAssembler::BaseIndex(storageReg, indexReg, MacroAssembler::TimesTwo, 0), scratchReg);
cont8Bit.link(&m_jit);
int32Result(scratchReg, m_currentNode);
}
void SpeculativeJIT::compileGetByValOnString(Node* node)
{
SpeculateCellOperand base(this, node->child1());
SpeculateStrictInt32Operand property(this, node->child2());
StorageOperand storage(this, node->child3());
GPRReg baseReg = base.gpr();
GPRReg propertyReg = property.gpr();
GPRReg storageReg = storage.gpr();
GPRTemporary scratch(this);
GPRReg scratchReg = scratch.gpr();
#if USE(JSVALUE32_64)
GPRTemporary resultTag;
GPRReg resultTagReg = InvalidGPRReg;
if (node->arrayMode().isOutOfBounds()) {
GPRTemporary realResultTag(this);
resultTag.adopt(realResultTag);
resultTagReg = resultTag.gpr();
}
#endif
ASSERT(ArrayMode(Array::String).alreadyChecked(m_jit.graph(), node, m_state.forNode(node->child1())));
// unsigned comparison so we can filter out negative indices and indices that are too large
JITCompiler::Jump outOfBounds = m_jit.branch32(
MacroAssembler::AboveOrEqual, propertyReg,
MacroAssembler::Address(baseReg, JSString::offsetOfLength()));
if (node->arrayMode().isInBounds())
speculationCheck(OutOfBounds, JSValueRegs(), 0, outOfBounds);
m_jit.loadPtr(MacroAssembler::Address(baseReg, JSString::offsetOfValue()), scratchReg);
// Load the character into scratchReg
JITCompiler::Jump is16Bit = m_jit.branchTest32(MacroAssembler::Zero, MacroAssembler::Address(scratchReg, StringImpl::flagsOffset()), TrustedImm32(StringImpl::flagIs8Bit()));
m_jit.load8(MacroAssembler::BaseIndex(storageReg, propertyReg, MacroAssembler::TimesOne, 0), scratchReg);
JITCompiler::Jump cont8Bit = m_jit.jump();
is16Bit.link(&m_jit);
m_jit.load16(MacroAssembler::BaseIndex(storageReg, propertyReg, MacroAssembler::TimesTwo, 0), scratchReg);
JITCompiler::Jump bigCharacter =
m_jit.branch32(MacroAssembler::AboveOrEqual, scratchReg, TrustedImm32(0x100));
// 8 bit string values don't need the isASCII check.
cont8Bit.link(&m_jit);
m_jit.lshift32(MacroAssembler::TrustedImm32(sizeof(void*) == 4 ? 2 : 3), scratchReg);
m_jit.addPtr(MacroAssembler::TrustedImmPtr(m_jit.vm()->smallStrings.singleCharacterStrings()), scratchReg);
m_jit.loadPtr(scratchReg, scratchReg);
addSlowPathGenerator(
slowPathCall(
bigCharacter, this, operationSingleCharacterString, scratchReg, scratchReg));
if (node->arrayMode().isOutOfBounds()) {
#if USE(JSVALUE32_64)
m_jit.move(TrustedImm32(JSValue::CellTag), resultTagReg);
#endif
JSGlobalObject* globalObject = m_jit.globalObjectFor(node->origin.semantic);
if (globalObject->stringPrototypeChainIsSane()) {
#if USE(JSVALUE64)
addSlowPathGenerator(adoptPtr(new SaneStringGetByValSlowPathGenerator(
outOfBounds, this, JSValueRegs(scratchReg), baseReg, propertyReg)));
#else
addSlowPathGenerator(adoptPtr(new SaneStringGetByValSlowPathGenerator(
outOfBounds, this, JSValueRegs(resultTagReg, scratchReg),
baseReg, propertyReg)));
#endif
} else {
#if USE(JSVALUE64)
addSlowPathGenerator(
slowPathCall(
outOfBounds, this, operationGetByValStringInt,
scratchReg, baseReg, propertyReg));
#else
addSlowPathGenerator(
slowPathCall(
outOfBounds, this, operationGetByValStringInt,
resultTagReg, scratchReg, baseReg, propertyReg));
#endif
}
#if USE(JSVALUE64)
jsValueResult(scratchReg, m_currentNode);
#else
jsValueResult(resultTagReg, scratchReg, m_currentNode);
#endif
} else
cellResult(scratchReg, m_currentNode);
}
void SpeculativeJIT::compileFromCharCode(Node* node)
{
SpeculateStrictInt32Operand property(this, node->child1());
GPRReg propertyReg = property.gpr();
GPRTemporary smallStrings(this);
GPRTemporary scratch(this);
GPRReg scratchReg = scratch.gpr();
GPRReg smallStringsReg = smallStrings.gpr();
JITCompiler::JumpList slowCases;
slowCases.append(m_jit.branch32(MacroAssembler::AboveOrEqual, propertyReg, TrustedImm32(0xff)));
m_jit.move(MacroAssembler::TrustedImmPtr(m_jit.vm()->smallStrings.singleCharacterStrings()), smallStringsReg);
m_jit.loadPtr(MacroAssembler::BaseIndex(smallStringsReg, propertyReg, MacroAssembler::ScalePtr, 0), scratchReg);
slowCases.append(m_jit.branchTest32(MacroAssembler::Zero, scratchReg));
addSlowPathGenerator(slowPathCall(slowCases, this, operationStringFromCharCode, scratchReg, propertyReg));
cellResult(scratchReg, m_currentNode);
}
GeneratedOperandType SpeculativeJIT::checkGeneratedTypeForToInt32(Node* node)
{
VirtualRegister virtualRegister = node->virtualRegister();
GenerationInfo& info = generationInfoFromVirtualRegister(virtualRegister);
switch (info.registerFormat()) {
case DataFormatStorage:
RELEASE_ASSERT_NOT_REACHED();
case DataFormatBoolean:
case DataFormatCell:
terminateSpeculativeExecution(Uncountable, JSValueRegs(), 0);
return GeneratedOperandTypeUnknown;
case DataFormatNone:
case DataFormatJSCell:
case DataFormatJS:
case DataFormatJSBoolean:
case DataFormatJSDouble:
return GeneratedOperandJSValue;
case DataFormatJSInt32:
case DataFormatInt32:
return GeneratedOperandInteger;
default:
RELEASE_ASSERT_NOT_REACHED();
return GeneratedOperandTypeUnknown;
}
}
void SpeculativeJIT::compileValueToInt32(Node* node)
{
switch (node->child1().useKind()) {
#if USE(JSVALUE64)
case Int52RepUse: {
SpeculateStrictInt52Operand op1(this, node->child1());
GPRTemporary result(this, Reuse, op1);
GPRReg op1GPR = op1.gpr();
GPRReg resultGPR = result.gpr();
m_jit.zeroExtend32ToPtr(op1GPR, resultGPR);
int32Result(resultGPR, node, DataFormatInt32);
return;
}
#endif // USE(JSVALUE64)
case DoubleRepUse: {
GPRTemporary result(this);
SpeculateDoubleOperand op1(this, node->child1());
FPRReg fpr = op1.fpr();
GPRReg gpr = result.gpr();
JITCompiler::Jump notTruncatedToInteger = m_jit.branchTruncateDoubleToInt32(fpr, gpr, JITCompiler::BranchIfTruncateFailed);
addSlowPathGenerator(slowPathCall(notTruncatedToInteger, this, toInt32, gpr, fpr));
int32Result(gpr, node);
return;
}
case NumberUse:
case NotCellUse: {
switch (checkGeneratedTypeForToInt32(node->child1().node())) {
case GeneratedOperandInteger: {
SpeculateInt32Operand op1(this, node->child1(), ManualOperandSpeculation);
GPRTemporary result(this, Reuse, op1);
m_jit.move(op1.gpr(), result.gpr());
int32Result(result.gpr(), node, op1.format());
return;
}
case GeneratedOperandJSValue: {
GPRTemporary result(this);
#if USE(JSVALUE64)
JSValueOperand op1(this, node->child1(), ManualOperandSpeculation);
GPRReg gpr = op1.gpr();
GPRReg resultGpr = result.gpr();
FPRTemporary tempFpr(this);
FPRReg fpr = tempFpr.fpr();
JITCompiler::Jump isInteger = m_jit.branch64(MacroAssembler::AboveOrEqual, gpr, GPRInfo::tagTypeNumberRegister);
JITCompiler::JumpList converted;
if (node->child1().useKind() == NumberUse) {
DFG_TYPE_CHECK(
JSValueRegs(gpr), node->child1(), SpecBytecodeNumber,
m_jit.branchTest64(
MacroAssembler::Zero, gpr, GPRInfo::tagTypeNumberRegister));
} else {
JITCompiler::Jump isNumber = m_jit.branchTest64(MacroAssembler::NonZero, gpr, GPRInfo::tagTypeNumberRegister);
DFG_TYPE_CHECK(
JSValueRegs(gpr), node->child1(), ~SpecCell, branchIsCell(JSValueRegs(gpr)));
// It's not a cell: so true turns into 1 and all else turns into 0.
m_jit.compare64(JITCompiler::Equal, gpr, TrustedImm32(ValueTrue), resultGpr);
converted.append(m_jit.jump());
isNumber.link(&m_jit);
}
// First, if we get here we have a double encoded as a JSValue
m_jit.move(gpr, resultGpr);
unboxDouble(resultGpr, fpr);
silentSpillAllRegisters(resultGpr);
callOperation(toInt32, resultGpr, fpr);
silentFillAllRegisters(resultGpr);
converted.append(m_jit.jump());
isInteger.link(&m_jit);
m_jit.zeroExtend32ToPtr(gpr, resultGpr);
converted.link(&m_jit);
#else
Node* childNode = node->child1().node();
VirtualRegister virtualRegister = childNode->virtualRegister();
GenerationInfo& info = generationInfoFromVirtualRegister(virtualRegister);
JSValueOperand op1(this, node->child1(), ManualOperandSpeculation);
GPRReg payloadGPR = op1.payloadGPR();
GPRReg resultGpr = result.gpr();
JITCompiler::JumpList converted;
if (info.registerFormat() == DataFormatJSInt32)
m_jit.move(payloadGPR, resultGpr);
else {
GPRReg tagGPR = op1.tagGPR();
FPRTemporary tempFpr(this);
FPRReg fpr = tempFpr.fpr();
FPRTemporary scratch(this);
JITCompiler::Jump isInteger = m_jit.branch32(MacroAssembler::Equal, tagGPR, TrustedImm32(JSValue::Int32Tag));
if (node->child1().useKind() == NumberUse) {
DFG_TYPE_CHECK(
op1.jsValueRegs(), node->child1(), SpecBytecodeNumber,
m_jit.branch32(
MacroAssembler::AboveOrEqual, tagGPR,
TrustedImm32(JSValue::LowestTag)));
} else {
JITCompiler::Jump isNumber = m_jit.branch32(MacroAssembler::Below, tagGPR, TrustedImm32(JSValue::LowestTag));
DFG_TYPE_CHECK(
op1.jsValueRegs(), node->child1(), ~SpecCell,
branchIsCell(op1.jsValueRegs()));
// It's not a cell: so true turns into 1 and all else turns into 0.
JITCompiler::Jump isBoolean = m_jit.branch32(JITCompiler::Equal, tagGPR, TrustedImm32(JSValue::BooleanTag));
m_jit.move(TrustedImm32(0), resultGpr);
converted.append(m_jit.jump());
isBoolean.link(&m_jit);
m_jit.move(payloadGPR, resultGpr);
converted.append(m_jit.jump());
isNumber.link(&m_jit);
}
unboxDouble(tagGPR, payloadGPR, fpr, scratch.fpr());
silentSpillAllRegisters(resultGpr);
callOperation(toInt32, resultGpr, fpr);
silentFillAllRegisters(resultGpr);
converted.append(m_jit.jump());
isInteger.link(&m_jit);
m_jit.move(payloadGPR, resultGpr);
converted.link(&m_jit);
}
#endif
int32Result(resultGpr, node);
return;
}
case GeneratedOperandTypeUnknown:
RELEASE_ASSERT(!m_compileOkay);
return;
}
RELEASE_ASSERT_NOT_REACHED();
return;
}
default:
ASSERT(!m_compileOkay);
return;
}
}
void SpeculativeJIT::compileUInt32ToNumber(Node* node)
{
if (doesOverflow(node->arithMode())) {
// We know that this sometimes produces doubles. So produce a double every
// time. This at least allows subsequent code to not have weird conditionals.
SpeculateInt32Operand op1(this, node->child1());
FPRTemporary result(this);
GPRReg inputGPR = op1.gpr();
FPRReg outputFPR = result.fpr();
m_jit.convertInt32ToDouble(inputGPR, outputFPR);
JITCompiler::Jump positive = m_jit.branch32(MacroAssembler::GreaterThanOrEqual, inputGPR, TrustedImm32(0));
m_jit.addDouble(JITCompiler::AbsoluteAddress(&AssemblyHelpers::twoToThe32), outputFPR);
positive.link(&m_jit);
doubleResult(outputFPR, node);
return;
}
RELEASE_ASSERT(node->arithMode() == Arith::CheckOverflow);
SpeculateInt32Operand op1(this, node->child1());
GPRTemporary result(this);
m_jit.move(op1.gpr(), result.gpr());
speculationCheck(Overflow, JSValueRegs(), 0, m_jit.branch32(MacroAssembler::LessThan, result.gpr(), TrustedImm32(0)));
int32Result(result.gpr(), node, op1.format());
}
void SpeculativeJIT::compileDoubleAsInt32(Node* node)
{
SpeculateDoubleOperand op1(this, node->child1());
FPRTemporary scratch(this);
GPRTemporary result(this);
FPRReg valueFPR = op1.fpr();
FPRReg scratchFPR = scratch.fpr();
GPRReg resultGPR = result.gpr();
JITCompiler::JumpList failureCases;
RELEASE_ASSERT(shouldCheckOverflow(node->arithMode()));
m_jit.branchConvertDoubleToInt32(
valueFPR, resultGPR, failureCases, scratchFPR,
shouldCheckNegativeZero(node->arithMode()));
speculationCheck(Overflow, JSValueRegs(), 0, failureCases);
int32Result(resultGPR, node);
}
void SpeculativeJIT::compileDoubleRep(Node* node)
{
switch (node->child1().useKind()) {
case NumberUse: {
ASSERT(!isNumberConstant(node->child1().node())); // This should have been constant folded.
if (isInt32Speculation(m_state.forNode(node->child1()).m_type)) {
SpeculateInt32Operand op1(this, node->child1(), ManualOperandSpeculation);
FPRTemporary result(this);
m_jit.convertInt32ToDouble(op1.gpr(), result.fpr());
doubleResult(result.fpr(), node);
return;
}
JSValueOperand op1(this, node->child1(), ManualOperandSpeculation);
FPRTemporary result(this);
#if USE(JSVALUE64)
GPRTemporary temp(this);
GPRReg op1GPR = op1.gpr();
GPRReg tempGPR = temp.gpr();
FPRReg resultFPR = result.fpr();
JITCompiler::Jump isInteger = m_jit.branch64(
MacroAssembler::AboveOrEqual, op1GPR, GPRInfo::tagTypeNumberRegister);
if (needsTypeCheck(node->child1(), SpecBytecodeNumber)) {
typeCheck(
JSValueRegs(op1GPR), node->child1(), SpecBytecodeNumber,
m_jit.branchTest64(MacroAssembler::Zero, op1GPR, GPRInfo::tagTypeNumberRegister));
}
m_jit.move(op1GPR, tempGPR);
unboxDouble(tempGPR, resultFPR);
JITCompiler::Jump done = m_jit.jump();
isInteger.link(&m_jit);
m_jit.convertInt32ToDouble(op1GPR, resultFPR);
done.link(&m_jit);
#else // USE(JSVALUE64) -> this is the 32_64 case
FPRTemporary temp(this);
GPRReg op1TagGPR = op1.tagGPR();
GPRReg op1PayloadGPR = op1.payloadGPR();
FPRReg tempFPR = temp.fpr();
FPRReg resultFPR = result.fpr();
JITCompiler::Jump isInteger = m_jit.branch32(
MacroAssembler::Equal, op1TagGPR, TrustedImm32(JSValue::Int32Tag));
if (needsTypeCheck(node->child1(), SpecBytecodeNumber)) {
typeCheck(
JSValueRegs(op1TagGPR, op1PayloadGPR), node->child1(), SpecBytecodeNumber,
m_jit.branch32(MacroAssembler::AboveOrEqual, op1TagGPR, TrustedImm32(JSValue::LowestTag)));
}
unboxDouble(op1TagGPR, op1PayloadGPR, resultFPR, tempFPR);
JITCompiler::Jump done = m_jit.jump();
isInteger.link(&m_jit);
m_jit.convertInt32ToDouble(op1PayloadGPR, resultFPR);
done.link(&m_jit);
#endif // USE(JSVALUE64)
doubleResult(resultFPR, node);
return;
}
#if USE(JSVALUE64)
case Int52RepUse: {
SpeculateStrictInt52Operand value(this, node->child1());
FPRTemporary result(this);
GPRReg valueGPR = value.gpr();
FPRReg resultFPR = result.fpr();
m_jit.convertInt64ToDouble(valueGPR, resultFPR);
doubleResult(resultFPR, node);
return;
}
#endif // USE(JSVALUE64)
default:
RELEASE_ASSERT_NOT_REACHED();
return;
}
}
void SpeculativeJIT::compileValueRep(Node* node)
{
switch (node->child1().useKind()) {
case DoubleRepUse: {
SpeculateDoubleOperand value(this, node->child1());
JSValueRegsTemporary result(this);
FPRReg valueFPR = value.fpr();
JSValueRegs resultRegs = result.regs();
// It's very tempting to in-place filter the value to indicate that it's not impure NaN
// anymore. Unfortunately, this would be unsound. If it's a GetLocal or if the value was
// subject to a prior SetLocal, filtering the value would imply that the corresponding
// local was purified.
if (needsTypeCheck(node->child1(), ~SpecDoubleImpureNaN))
m_jit.purifyNaN(valueFPR);
#if CPU(X86)
// boxDouble() on X86 clobbers the source, so we need to copy.
// FIXME: Don't do that! https://bugs.webkit.org/show_bug.cgi?id=131690
FPRTemporary temp(this);
m_jit.moveDouble(valueFPR, temp.fpr());
valueFPR = temp.fpr();
#endif
boxDouble(valueFPR, resultRegs);
jsValueResult(resultRegs, node);
return;
}
#if USE(JSVALUE64)
case Int52RepUse: {
SpeculateStrictInt52Operand value(this, node->child1());
GPRTemporary result(this);
GPRReg valueGPR = value.gpr();
GPRReg resultGPR = result.gpr();
boxInt52(valueGPR, resultGPR, DataFormatStrictInt52);
jsValueResult(resultGPR, node);
return;
}
#endif // USE(JSVALUE64)
default:
RELEASE_ASSERT_NOT_REACHED();
return;
}
}
static double clampDoubleToByte(double d)
{
d += 0.5;
if (!(d > 0))
d = 0;
else if (d > 255)
d = 255;
return d;
}
static void compileClampIntegerToByte(JITCompiler& jit, GPRReg result)
{
MacroAssembler::Jump inBounds = jit.branch32(MacroAssembler::BelowOrEqual, result, JITCompiler::TrustedImm32(0xff));
MacroAssembler::Jump tooBig = jit.branch32(MacroAssembler::GreaterThan, result, JITCompiler::TrustedImm32(0xff));
jit.xorPtr(result, result);
MacroAssembler::Jump clamped = jit.jump();
tooBig.link(&jit);
jit.move(JITCompiler::TrustedImm32(255), result);
clamped.link(&jit);
inBounds.link(&jit);
}
static void compileClampDoubleToByte(JITCompiler& jit, GPRReg result, FPRReg source, FPRReg scratch)
{
// Unordered compare so we pick up NaN
static const double zero = 0;
static const double byteMax = 255;
static const double half = 0.5;
jit.loadDouble(MacroAssembler::TrustedImmPtr(&zero), scratch);
MacroAssembler::Jump tooSmall = jit.branchDouble(MacroAssembler::DoubleLessThanOrEqualOrUnordered, source, scratch);
jit.loadDouble(MacroAssembler::TrustedImmPtr(&byteMax), scratch);
MacroAssembler::Jump tooBig = jit.branchDouble(MacroAssembler::DoubleGreaterThan, source, scratch);
jit.loadDouble(MacroAssembler::TrustedImmPtr(&half), scratch);
// FIXME: This should probably just use a floating point round!
// https://bugs.webkit.org/show_bug.cgi?id=72054
jit.addDouble(source, scratch);
jit.truncateDoubleToInt32(scratch, result);
MacroAssembler::Jump truncatedInt = jit.jump();
tooSmall.link(&jit);
jit.xorPtr(result, result);
MacroAssembler::Jump zeroed = jit.jump();
tooBig.link(&jit);
jit.move(JITCompiler::TrustedImm32(255), result);
truncatedInt.link(&jit);
zeroed.link(&jit);
}
JITCompiler::Jump SpeculativeJIT::jumpForTypedArrayOutOfBounds(Node* node, GPRReg baseGPR, GPRReg indexGPR)
{
if (node->op() == PutByValAlias)
return JITCompiler::Jump();
if (JSArrayBufferView* view = m_jit.graph().tryGetFoldableViewForChild1(node)) {
uint32_t length = view->length();
Node* indexNode = m_jit.graph().child(node, 1).node();
if (m_jit.graph().isInt32Constant(indexNode) && static_cast<uint32_t>(m_jit.graph().valueOfInt32Constant(indexNode)) < length)
return JITCompiler::Jump();
return m_jit.branch32(
MacroAssembler::AboveOrEqual, indexGPR, MacroAssembler::Imm32(length));
}
return m_jit.branch32(
MacroAssembler::AboveOrEqual, indexGPR,
MacroAssembler::Address(baseGPR, JSArrayBufferView::offsetOfLength()));
}
void SpeculativeJIT::emitTypedArrayBoundsCheck(Node* node, GPRReg baseGPR, GPRReg indexGPR)
{
JITCompiler::Jump jump = jumpForTypedArrayOutOfBounds(node, baseGPR, indexGPR);
if (!jump.isSet())
return;
speculationCheck(OutOfBounds, JSValueRegs(), 0, jump);
}
void SpeculativeJIT::compileGetByValOnIntTypedArray(Node* node, TypedArrayType type)
{
ASSERT(isInt(type));
SpeculateCellOperand base(this, node->child1());
SpeculateStrictInt32Operand property(this, node->child2());
StorageOperand storage(this, node->child3());
GPRReg baseReg = base.gpr();
GPRReg propertyReg = property.gpr();
GPRReg storageReg = storage.gpr();
GPRTemporary result(this);
GPRReg resultReg = result.gpr();
ASSERT(node->arrayMode().alreadyChecked(m_jit.graph(), node, m_state.forNode(node->child1())));
emitTypedArrayBoundsCheck(node, baseReg, propertyReg);
switch (elementSize(type)) {
case 1:
if (isSigned(type))
m_jit.load8Signed(MacroAssembler::BaseIndex(storageReg, propertyReg, MacroAssembler::TimesOne), resultReg);
else
m_jit.load8(MacroAssembler::BaseIndex(storageReg, propertyReg, MacroAssembler::TimesOne), resultReg);
break;
case 2:
if (isSigned(type))
m_jit.load16Signed(MacroAssembler::BaseIndex(storageReg, propertyReg, MacroAssembler::TimesTwo), resultReg);
else
m_jit.load16(MacroAssembler::BaseIndex(storageReg, propertyReg, MacroAssembler::TimesTwo), resultReg);
break;
case 4:
m_jit.load32(MacroAssembler::BaseIndex(storageReg, propertyReg, MacroAssembler::TimesFour), resultReg);
break;
default:
CRASH();
}
if (elementSize(type) < 4 || isSigned(type)) {
int32Result(resultReg, node);
return;
}
ASSERT(elementSize(type) == 4 && !isSigned(type));
if (node->shouldSpeculateInt32()) {
speculationCheck(Overflow, JSValueRegs(), 0, m_jit.branch32(MacroAssembler::LessThan, resultReg, TrustedImm32(0)));
int32Result(resultReg, node);
return;
}
#if USE(JSVALUE64)
if (node->shouldSpeculateMachineInt()) {
m_jit.zeroExtend32ToPtr(resultReg, resultReg);
strictInt52Result(resultReg, node);
return;
}
#endif
FPRTemporary fresult(this);
m_jit.convertInt32ToDouble(resultReg, fresult.fpr());
JITCompiler::Jump positive = m_jit.branch32(MacroAssembler::GreaterThanOrEqual, resultReg, TrustedImm32(0));
m_jit.addDouble(JITCompiler::AbsoluteAddress(&AssemblyHelpers::twoToThe32), fresult.fpr());
positive.link(&m_jit);
doubleResult(fresult.fpr(), node);
}
void SpeculativeJIT::compilePutByValForIntTypedArray(GPRReg base, GPRReg property, Node* node, TypedArrayType type)
{
ASSERT(isInt(type));
StorageOperand storage(this, m_jit.graph().varArgChild(node, 3));
GPRReg storageReg = storage.gpr();
Edge valueUse = m_jit.graph().varArgChild(node, 2);
GPRTemporary value;
GPRReg valueGPR = InvalidGPRReg;
if (valueUse->isConstant()) {
JSValue jsValue = valueOfJSConstant(valueUse.node());
if (!jsValue.isNumber()) {
terminateSpeculativeExecution(Uncountable, JSValueRegs(), 0);
noResult(node);
return;
}
double d = jsValue.asNumber();
if (isClamped(type)) {
ASSERT(elementSize(type) == 1);
d = clampDoubleToByte(d);
}
GPRTemporary scratch(this);
GPRReg scratchReg = scratch.gpr();
m_jit.move(Imm32(toInt32(d)), scratchReg);
value.adopt(scratch);
valueGPR = scratchReg;
} else {
switch (valueUse.useKind()) {
case Int32Use: {
SpeculateInt32Operand valueOp(this, valueUse);
GPRTemporary scratch(this);
GPRReg scratchReg = scratch.gpr();
m_jit.move(valueOp.gpr(), scratchReg);
if (isClamped(type)) {
ASSERT(elementSize(type) == 1);
compileClampIntegerToByte(m_jit, scratchReg);
}
value.adopt(scratch);
valueGPR = scratchReg;
break;
}
#if USE(JSVALUE64)
case Int52RepUse: {
SpeculateStrictInt52Operand valueOp(this, valueUse);
GPRTemporary scratch(this);
GPRReg scratchReg = scratch.gpr();
m_jit.move(valueOp.gpr(), scratchReg);
if (isClamped(type)) {
ASSERT(elementSize(type) == 1);
MacroAssembler::Jump inBounds = m_jit.branch64(
MacroAssembler::BelowOrEqual, scratchReg, JITCompiler::TrustedImm64(0xff));
MacroAssembler::Jump tooBig = m_jit.branch64(
MacroAssembler::GreaterThan, scratchReg, JITCompiler::TrustedImm64(0xff));
m_jit.move(TrustedImm32(0), scratchReg);
MacroAssembler::Jump clamped = m_jit.jump();
tooBig.link(&m_jit);
m_jit.move(JITCompiler::TrustedImm32(255), scratchReg);
clamped.link(&m_jit);
inBounds.link(&m_jit);
}
value.adopt(scratch);
valueGPR = scratchReg;
break;
}
#endif // USE(JSVALUE64)
case DoubleRepUse: {
if (isClamped(type)) {
ASSERT(elementSize(type) == 1);
SpeculateDoubleOperand valueOp(this, valueUse);
GPRTemporary result(this);
FPRTemporary floatScratch(this);
FPRReg fpr = valueOp.fpr();
GPRReg gpr = result.gpr();
compileClampDoubleToByte(m_jit, gpr, fpr, floatScratch.fpr());
value.adopt(result);
valueGPR = gpr;
} else {
SpeculateDoubleOperand valueOp(this, valueUse);
GPRTemporary result(this);
FPRReg fpr = valueOp.fpr();
GPRReg gpr = result.gpr();
MacroAssembler::Jump notNaN = m_jit.branchDouble(MacroAssembler::DoubleEqual, fpr, fpr);
m_jit.xorPtr(gpr, gpr);
MacroAssembler::Jump fixed = m_jit.jump();
notNaN.link(&m_jit);
MacroAssembler::Jump failed = m_jit.branchTruncateDoubleToInt32(
fpr, gpr, MacroAssembler::BranchIfTruncateFailed);
addSlowPathGenerator(slowPathCall(failed, this, toInt32, gpr, fpr));
fixed.link(&m_jit);
value.adopt(result);
valueGPR = gpr;
}
break;
}
default:
RELEASE_ASSERT_NOT_REACHED();
break;
}
}
ASSERT_UNUSED(valueGPR, valueGPR != property);
ASSERT(valueGPR != base);
ASSERT(valueGPR != storageReg);
MacroAssembler::Jump outOfBounds = jumpForTypedArrayOutOfBounds(node, base, property);
if (node->arrayMode().isInBounds() && outOfBounds.isSet()) {
speculationCheck(OutOfBounds, JSValueSource(), 0, outOfBounds);
outOfBounds = MacroAssembler::Jump();
}
switch (elementSize(type)) {
case 1:
m_jit.store8(value.gpr(), MacroAssembler::BaseIndex(storageReg, property, MacroAssembler::TimesOne));
break;
case 2:
m_jit.store16(value.gpr(), MacroAssembler::BaseIndex(storageReg, property, MacroAssembler::TimesTwo));
break;
case 4:
m_jit.store32(value.gpr(), MacroAssembler::BaseIndex(storageReg, property, MacroAssembler::TimesFour));
break;
default:
CRASH();
}
if (outOfBounds.isSet())
outOfBounds.link(&m_jit);
noResult(node);
}
void SpeculativeJIT::compileGetByValOnFloatTypedArray(Node* node, TypedArrayType type)
{
ASSERT(isFloat(type));
SpeculateCellOperand base(this, node->child1());
SpeculateStrictInt32Operand property(this, node->child2());
StorageOperand storage(this, node->child3());
GPRReg baseReg = base.gpr();
GPRReg propertyReg = property.gpr();
GPRReg storageReg = storage.gpr();
ASSERT(node->arrayMode().alreadyChecked(m_jit.graph(), node, m_state.forNode(node->child1())));
FPRTemporary result(this);
FPRReg resultReg = result.fpr();
emitTypedArrayBoundsCheck(node, baseReg, propertyReg);
switch (elementSize(type)) {
case 4:
m_jit.loadFloat(MacroAssembler::BaseIndex(storageReg, propertyReg, MacroAssembler::TimesFour), resultReg);
m_jit.convertFloatToDouble(resultReg, resultReg);
break;
case 8: {
m_jit.loadDouble(MacroAssembler::BaseIndex(storageReg, propertyReg, MacroAssembler::TimesEight), resultReg);
break;
}
default:
RELEASE_ASSERT_NOT_REACHED();
}
doubleResult(resultReg, node);
}
void SpeculativeJIT::compilePutByValForFloatTypedArray(GPRReg base, GPRReg property, Node* node, TypedArrayType type)
{
ASSERT(isFloat(type));
StorageOperand storage(this, m_jit.graph().varArgChild(node, 3));
GPRReg storageReg = storage.gpr();
Edge baseUse = m_jit.graph().varArgChild(node, 0);
Edge valueUse = m_jit.graph().varArgChild(node, 2);
SpeculateDoubleOperand valueOp(this, valueUse);
FPRTemporary scratch(this);
FPRReg valueFPR = valueOp.fpr();
FPRReg scratchFPR = scratch.fpr();
ASSERT_UNUSED(baseUse, node->arrayMode().alreadyChecked(m_jit.graph(), node, m_state.forNode(baseUse)));
MacroAssembler::Jump outOfBounds = jumpForTypedArrayOutOfBounds(node, base, property);
if (node->arrayMode().isInBounds() && outOfBounds.isSet()) {
speculationCheck(OutOfBounds, JSValueSource(), 0, outOfBounds);
outOfBounds = MacroAssembler::Jump();
}
switch (elementSize(type)) {
case 4: {
m_jit.moveDouble(valueFPR, scratchFPR);
m_jit.convertDoubleToFloat(valueFPR, scratchFPR);
m_jit.storeFloat(scratchFPR, MacroAssembler::BaseIndex(storageReg, property, MacroAssembler::TimesFour));
break;
}
case 8:
m_jit.storeDouble(valueFPR, MacroAssembler::BaseIndex(storageReg, property, MacroAssembler::TimesEight));
break;
default:
RELEASE_ASSERT_NOT_REACHED();
}
if (outOfBounds.isSet())
outOfBounds.link(&m_jit);
noResult(node);
}
void SpeculativeJIT::compileInstanceOfForObject(Node*, GPRReg valueReg, GPRReg prototypeReg, GPRReg scratchReg, GPRReg scratch2Reg)
{
// Check that prototype is an object.
speculationCheck(BadType, JSValueRegs(), 0, m_jit.branchIfCellNotObject(prototypeReg));
// Initialize scratchReg with the value being checked.
m_jit.move(valueReg, scratchReg);
// Walk up the prototype chain of the value (in scratchReg), comparing to prototypeReg.
MacroAssembler::Label loop(&m_jit);
m_jit.emitLoadStructure(scratchReg, scratchReg, scratch2Reg);
m_jit.loadPtr(MacroAssembler::Address(scratchReg, Structure::prototypeOffset() + CellPayloadOffset), scratchReg);
MacroAssembler::Jump isInstance = m_jit.branchPtr(MacroAssembler::Equal, scratchReg, prototypeReg);
#if USE(JSVALUE64)
branchIsCell(JSValueRegs(scratchReg)).linkTo(loop, &m_jit);
#else
m_jit.branchTestPtr(MacroAssembler::NonZero, scratchReg).linkTo(loop, &m_jit);
#endif
// No match - result is false.
#if USE(JSVALUE64)
m_jit.move(MacroAssembler::TrustedImm64(JSValue::encode(jsBoolean(false))), scratchReg);
#else
m_jit.move(MacroAssembler::TrustedImm32(0), scratchReg);
#endif
MacroAssembler::Jump putResult = m_jit.jump();
isInstance.link(&m_jit);
#if USE(JSVALUE64)
m_jit.move(MacroAssembler::TrustedImm64(JSValue::encode(jsBoolean(true))), scratchReg);
#else
m_jit.move(MacroAssembler::TrustedImm32(1), scratchReg);
#endif
putResult.link(&m_jit);
}
void SpeculativeJIT::compileInstanceOf(Node* node)
{
if (node->child1().useKind() == UntypedUse) {
// It might not be a cell. Speculate less aggressively.
// Or: it might only be used once (i.e. by us), so we get zero benefit
// from speculating any more aggressively than we absolutely need to.
JSValueOperand value(this, node->child1());
SpeculateCellOperand prototype(this, node->child2());
GPRTemporary scratch(this);
GPRTemporary scratch2(this);
GPRReg prototypeReg = prototype.gpr();
GPRReg scratchReg = scratch.gpr();
GPRReg scratch2Reg = scratch2.gpr();
MacroAssembler::Jump isCell = branchIsCell(value.jsValueRegs());
GPRReg valueReg = value.jsValueRegs().payloadGPR();
moveFalseTo(scratchReg);
MacroAssembler::Jump done = m_jit.jump();
isCell.link(&m_jit);
compileInstanceOfForObject(node, valueReg, prototypeReg, scratchReg, scratch2Reg);
done.link(&m_jit);
blessedBooleanResult(scratchReg, node);
return;
}
SpeculateCellOperand value(this, node->child1());
SpeculateCellOperand prototype(this, node->child2());
GPRTemporary scratch(this);
GPRTemporary scratch2(this);
GPRReg valueReg = value.gpr();
GPRReg prototypeReg = prototype.gpr();
GPRReg scratchReg = scratch.gpr();
GPRReg scratch2Reg = scratch2.gpr();
compileInstanceOfForObject(node, valueReg, prototypeReg, scratchReg, scratch2Reg);
blessedBooleanResult(scratchReg, node);
}
void SpeculativeJIT::compileAdd(Node* node)
{
switch (node->binaryUseKind()) {
case Int32Use: {
ASSERT(!shouldCheckNegativeZero(node->arithMode()));
if (isInt32Constant(node->child1().node())) {
int32_t imm1 = valueOfInt32Constant(node->child1().node());
SpeculateInt32Operand op2(this, node->child2());
GPRTemporary result(this);
if (!shouldCheckOverflow(node->arithMode())) {
m_jit.move(op2.gpr(), result.gpr());
m_jit.add32(Imm32(imm1), result.gpr());
} else
speculationCheck(Overflow, JSValueRegs(), 0, m_jit.branchAdd32(MacroAssembler::Overflow, op2.gpr(), Imm32(imm1), result.gpr()));
int32Result(result.gpr(), node);
return;
}
if (isInt32Constant(node->child2().node())) {
SpeculateInt32Operand op1(this, node->child1());
int32_t imm2 = valueOfInt32Constant(node->child2().node());
GPRTemporary result(this);
if (!shouldCheckOverflow(node->arithMode())) {
m_jit.move(op1.gpr(), result.gpr());
m_jit.add32(Imm32(imm2), result.gpr());
} else
speculationCheck(Overflow, JSValueRegs(), 0, m_jit.branchAdd32(MacroAssembler::Overflow, op1.gpr(), Imm32(imm2), result.gpr()));
int32Result(result.gpr(), node);
return;
}
SpeculateInt32Operand op1(this, node->child1());
SpeculateInt32Operand op2(this, node->child2());
GPRTemporary result(this, Reuse, op1, op2);
GPRReg gpr1 = op1.gpr();
GPRReg gpr2 = op2.gpr();
GPRReg gprResult = result.gpr();
if (!shouldCheckOverflow(node->arithMode())) {
if (gpr1 == gprResult)
m_jit.add32(gpr2, gprResult);
else {
m_jit.move(gpr2, gprResult);
m_jit.add32(gpr1, gprResult);
}
} else {
MacroAssembler::Jump check = m_jit.branchAdd32(MacroAssembler::Overflow, gpr1, gpr2, gprResult);
if (gpr1 == gprResult)
speculationCheck(Overflow, JSValueRegs(), 0, check, SpeculationRecovery(SpeculativeAdd, gprResult, gpr2));
else if (gpr2 == gprResult)
speculationCheck(Overflow, JSValueRegs(), 0, check, SpeculationRecovery(SpeculativeAdd, gprResult, gpr1));
else
speculationCheck(Overflow, JSValueRegs(), 0, check);
}
int32Result(gprResult, node);
return;
}
#if USE(JSVALUE64)
case Int52RepUse: {
ASSERT(shouldCheckOverflow(node->arithMode()));
ASSERT(!shouldCheckNegativeZero(node->arithMode()));
// Will we need an overflow check? If we can prove that neither input can be
// Int52 then the overflow check will not be necessary.
if (!m_state.forNode(node->child1()).couldBeType(SpecInt52)
&& !m_state.forNode(node->child2()).couldBeType(SpecInt52)) {
SpeculateWhicheverInt52Operand op1(this, node->child1());
SpeculateWhicheverInt52Operand op2(this, node->child2(), op1);
GPRTemporary result(this, Reuse, op1);
m_jit.move(op1.gpr(), result.gpr());
m_jit.add64(op2.gpr(), result.gpr());
int52Result(result.gpr(), node, op1.format());
return;
}
SpeculateInt52Operand op1(this, node->child1());
SpeculateInt52Operand op2(this, node->child2());
GPRTemporary result(this);
m_jit.move(op1.gpr(), result.gpr());
speculationCheck(
Int52Overflow, JSValueRegs(), 0,
m_jit.branchAdd64(MacroAssembler::Overflow, op2.gpr(), result.gpr()));
int52Result(result.gpr(), node);
return;
}
#endif // USE(JSVALUE64)
case DoubleRepUse: {
SpeculateDoubleOperand op1(this, node->child1());
SpeculateDoubleOperand op2(this, node->child2());
FPRTemporary result(this, op1, op2);
FPRReg reg1 = op1.fpr();
FPRReg reg2 = op2.fpr();
m_jit.addDouble(reg1, reg2, result.fpr());
doubleResult(result.fpr(), node);
return;
}
default:
RELEASE_ASSERT_NOT_REACHED();
break;
}
}
void SpeculativeJIT::compileMakeRope(Node* node)
{
ASSERT(node->child1().useKind() == KnownStringUse);
ASSERT(node->child2().useKind() == KnownStringUse);
ASSERT(!node->child3() || node->child3().useKind() == KnownStringUse);
SpeculateCellOperand op1(this, node->child1());
SpeculateCellOperand op2(this, node->child2());
SpeculateCellOperand op3(this, node->child3());
GPRTemporary result(this);
GPRTemporary allocator(this);
GPRTemporary scratch(this);
GPRReg opGPRs[3];
unsigned numOpGPRs;
opGPRs[0] = op1.gpr();
opGPRs[1] = op2.gpr();
if (node->child3()) {
opGPRs[2] = op3.gpr();
numOpGPRs = 3;
} else {
opGPRs[2] = InvalidGPRReg;
numOpGPRs = 2;
}
GPRReg resultGPR = result.gpr();
GPRReg allocatorGPR = allocator.gpr();
GPRReg scratchGPR = scratch.gpr();
JITCompiler::JumpList slowPath;
MarkedAllocator& markedAllocator = m_jit.vm()->heap.allocatorForObjectWithImmortalStructureDestructor(sizeof(JSRopeString));
m_jit.move(TrustedImmPtr(&markedAllocator), allocatorGPR);
emitAllocateJSCell(resultGPR, allocatorGPR, TrustedImmPtr(m_jit.vm()->stringStructure.get()), scratchGPR, slowPath);
m_jit.storePtr(TrustedImmPtr(0), JITCompiler::Address(resultGPR, JSString::offsetOfValue()));
for (unsigned i = 0; i < numOpGPRs; ++i)
m_jit.storePtr(opGPRs[i], JITCompiler::Address(resultGPR, JSRopeString::offsetOfFibers() + sizeof(WriteBarrier<JSString>) * i));
for (unsigned i = numOpGPRs; i < JSRopeString::s_maxInternalRopeLength; ++i)
m_jit.storePtr(TrustedImmPtr(0), JITCompiler::Address(resultGPR, JSRopeString::offsetOfFibers() + sizeof(WriteBarrier<JSString>) * i));
m_jit.load32(JITCompiler::Address(opGPRs[0], JSString::offsetOfFlags()), scratchGPR);
m_jit.load32(JITCompiler::Address(opGPRs[0], JSString::offsetOfLength()), allocatorGPR);
if (!ASSERT_DISABLED) {
JITCompiler::Jump ok = m_jit.branch32(
JITCompiler::GreaterThanOrEqual, allocatorGPR, TrustedImm32(0));
m_jit.abortWithReason(DFGNegativeStringLength);
ok.link(&m_jit);
}
for (unsigned i = 1; i < numOpGPRs; ++i) {
m_jit.and32(JITCompiler::Address(opGPRs[i], JSString::offsetOfFlags()), scratchGPR);
speculationCheck(
Uncountable, JSValueSource(), nullptr,
m_jit.branchAdd32(
JITCompiler::Overflow,
JITCompiler::Address(opGPRs[i], JSString::offsetOfLength()), allocatorGPR));
}
m_jit.and32(JITCompiler::TrustedImm32(JSString::Is8Bit), scratchGPR);
m_jit.store32(scratchGPR, JITCompiler::Address(resultGPR, JSString::offsetOfFlags()));
if (!ASSERT_DISABLED) {
JITCompiler::Jump ok = m_jit.branch32(
JITCompiler::GreaterThanOrEqual, allocatorGPR, TrustedImm32(0));
m_jit.abortWithReason(DFGNegativeStringLength);
ok.link(&m_jit);
}
m_jit.store32(allocatorGPR, JITCompiler::Address(resultGPR, JSString::offsetOfLength()));
switch (numOpGPRs) {
case 2:
addSlowPathGenerator(slowPathCall(
slowPath, this, operationMakeRope2, resultGPR, opGPRs[0], opGPRs[1]));
break;
case 3:
addSlowPathGenerator(slowPathCall(
slowPath, this, operationMakeRope3, resultGPR, opGPRs[0], opGPRs[1], opGPRs[2]));
break;
default:
RELEASE_ASSERT_NOT_REACHED();
break;
}
cellResult(resultGPR, node);
}
void SpeculativeJIT::compileArithSub(Node* node)
{
switch (node->binaryUseKind()) {
case Int32Use: {
ASSERT(!shouldCheckNegativeZero(node->arithMode()));
if (isNumberConstant(node->child2().node())) {
SpeculateInt32Operand op1(this, node->child1());
int32_t imm2 = valueOfInt32Constant(node->child2().node());
GPRTemporary result(this);
if (!shouldCheckOverflow(node->arithMode())) {
m_jit.move(op1.gpr(), result.gpr());
m_jit.sub32(Imm32(imm2), result.gpr());
} else {
GPRTemporary scratch(this);
speculationCheck(Overflow, JSValueRegs(), 0, m_jit.branchSub32(MacroAssembler::Overflow, op1.gpr(), Imm32(imm2), result.gpr(), scratch.gpr()));
}
int32Result(result.gpr(), node);
return;
}
if (isNumberConstant(node->child1().node())) {
int32_t imm1 = valueOfInt32Constant(node->child1().node());
SpeculateInt32Operand op2(this, node->child2());
GPRTemporary result(this);
m_jit.move(Imm32(imm1), result.gpr());
if (!shouldCheckOverflow(node->arithMode()))
m_jit.sub32(op2.gpr(), result.gpr());
else
speculationCheck(Overflow, JSValueRegs(), 0, m_jit.branchSub32(MacroAssembler::Overflow, op2.gpr(), result.gpr()));
int32Result(result.gpr(), node);
return;
}
SpeculateInt32Operand op1(this, node->child1());
SpeculateInt32Operand op2(this, node->child2());
GPRTemporary result(this);
if (!shouldCheckOverflow(node->arithMode())) {
m_jit.move(op1.gpr(), result.gpr());
m_jit.sub32(op2.gpr(), result.gpr());
} else
speculationCheck(Overflow, JSValueRegs(), 0, m_jit.branchSub32(MacroAssembler::Overflow, op1.gpr(), op2.gpr(), result.gpr()));
int32Result(result.gpr(), node);
return;
}
#if USE(JSVALUE64)
case Int52RepUse: {
ASSERT(shouldCheckOverflow(node->arithMode()));
ASSERT(!shouldCheckNegativeZero(node->arithMode()));
// Will we need an overflow check? If we can prove that neither input can be
// Int52 then the overflow check will not be necessary.
if (!m_state.forNode(node->child1()).couldBeType(SpecInt52)
&& !m_state.forNode(node->child2()).couldBeType(SpecInt52)) {
SpeculateWhicheverInt52Operand op1(this, node->child1());
SpeculateWhicheverInt52Operand op2(this, node->child2(), op1);
GPRTemporary result(this, Reuse, op1);
m_jit.move(op1.gpr(), result.gpr());
m_jit.sub64(op2.gpr(), result.gpr());
int52Result(result.gpr(), node, op1.format());
return;
}
SpeculateInt52Operand op1(this, node->child1());
SpeculateInt52Operand op2(this, node->child2());
GPRTemporary result(this);
m_jit.move(op1.gpr(), result.gpr());
speculationCheck(
Int52Overflow, JSValueRegs(), 0,
m_jit.branchSub64(MacroAssembler::Overflow, op2.gpr(), result.gpr()));
int52Result(result.gpr(), node);
return;
}
#endif // USE(JSVALUE64)
case DoubleRepUse: {
SpeculateDoubleOperand op1(this, node->child1());
SpeculateDoubleOperand op2(this, node->child2());
FPRTemporary result(this, op1);
FPRReg reg1 = op1.fpr();
FPRReg reg2 = op2.fpr();
m_jit.subDouble(reg1, reg2, result.fpr());
doubleResult(result.fpr(), node);
return;
}
default:
RELEASE_ASSERT_NOT_REACHED();
return;
}
}
void SpeculativeJIT::compileArithNegate(Node* node)
{
switch (node->child1().useKind()) {
case Int32Use: {
SpeculateInt32Operand op1(this, node->child1());
GPRTemporary result(this);
m_jit.move(op1.gpr(), result.gpr());
// Note: there is no notion of being not used as a number, but someone
// caring about negative zero.
if (!shouldCheckOverflow(node->arithMode()))
m_jit.neg32(result.gpr());
else if (!shouldCheckNegativeZero(node->arithMode()))
speculationCheck(Overflow, JSValueRegs(), 0, m_jit.branchNeg32(MacroAssembler::Overflow, result.gpr()));
else {
speculationCheck(Overflow, JSValueRegs(), 0, m_jit.branchTest32(MacroAssembler::Zero, result.gpr(), TrustedImm32(0x7fffffff)));
m_jit.neg32(result.gpr());
}
int32Result(result.gpr(), node);
return;
}
#if USE(JSVALUE64)
case Int52RepUse: {
ASSERT(shouldCheckOverflow(node->arithMode()));
if (!m_state.forNode(node->child1()).couldBeType(SpecInt52)) {
SpeculateWhicheverInt52Operand op1(this, node->child1());
GPRTemporary result(this);
GPRReg op1GPR = op1.gpr();
GPRReg resultGPR = result.gpr();
m_jit.move(op1GPR, resultGPR);
m_jit.neg64(resultGPR);
if (shouldCheckNegativeZero(node->arithMode())) {
speculationCheck(
NegativeZero, JSValueRegs(), 0,
m_jit.branchTest64(MacroAssembler::Zero, resultGPR));
}
int52Result(resultGPR, node, op1.format());
return;
}
SpeculateInt52Operand op1(this, node->child1());
GPRTemporary result(this);
GPRReg op1GPR = op1.gpr();
GPRReg resultGPR = result.gpr();
m_jit.move(op1GPR, resultGPR);
speculationCheck(
Int52Overflow, JSValueRegs(), 0,
m_jit.branchNeg64(MacroAssembler::Overflow, resultGPR));
if (shouldCheckNegativeZero(node->arithMode())) {
speculationCheck(
NegativeZero, JSValueRegs(), 0,
m_jit.branchTest64(MacroAssembler::Zero, resultGPR));
}
int52Result(resultGPR, node);
return;
}
#endif // USE(JSVALUE64)
case DoubleRepUse: {
SpeculateDoubleOperand op1(this, node->child1());
FPRTemporary result(this);
m_jit.negateDouble(op1.fpr(), result.fpr());
doubleResult(result.fpr(), node);
return;
}
default:
RELEASE_ASSERT_NOT_REACHED();
return;
}
}
void SpeculativeJIT::compileArithMul(Node* node)
{
switch (node->binaryUseKind()) {
case Int32Use: {
SpeculateInt32Operand op1(this, node->child1());
SpeculateInt32Operand op2(this, node->child2());
GPRTemporary result(this);
GPRReg reg1 = op1.gpr();
GPRReg reg2 = op2.gpr();
// We can perform truncated multiplications if we get to this point, because if the
// fixup phase could not prove that it would be safe, it would have turned us into
// a double multiplication.
if (!shouldCheckOverflow(node->arithMode())) {
m_jit.move(reg1, result.gpr());
m_jit.mul32(reg2, result.gpr());
} else {
speculationCheck(
Overflow, JSValueRegs(), 0,
m_jit.branchMul32(MacroAssembler::Overflow, reg1, reg2, result.gpr()));
}
// Check for negative zero, if the users of this node care about such things.
if (shouldCheckNegativeZero(node->arithMode())) {
MacroAssembler::Jump resultNonZero = m_jit.branchTest32(MacroAssembler::NonZero, result.gpr());
speculationCheck(NegativeZero, JSValueRegs(), 0, m_jit.branch32(MacroAssembler::LessThan, reg1, TrustedImm32(0)));
speculationCheck(NegativeZero, JSValueRegs(), 0, m_jit.branch32(MacroAssembler::LessThan, reg2, TrustedImm32(0)));
resultNonZero.link(&m_jit);
}
int32Result(result.gpr(), node);
return;
}
#if USE(JSVALUE64)
case Int52RepUse: {
ASSERT(shouldCheckOverflow(node->arithMode()));
// This is super clever. We want to do an int52 multiplication and check the
// int52 overflow bit. There is no direct hardware support for this, but we do
// have the ability to do an int64 multiplication and check the int64 overflow
// bit. We leverage that. Consider that a, b are int52 numbers inside int64
// registers, with the high 12 bits being sign-extended. We can do:
//
// (a * (b << 12))
//
// This will give us a left-shifted int52 (value is in high 52 bits, low 16
// bits are zero) plus the int52 overflow bit. I.e. whether this 64-bit
// multiplication overflows is identical to whether the 'a * b' 52-bit
// multiplication overflows.
//
// In our nomenclature, this is:
//
// strictInt52(a) * int52(b) => int52
//
// That is "strictInt52" means unshifted and "int52" means left-shifted by 16
// bits.
//
// We don't care which of op1 or op2 serves as the left-shifted operand, so
// we just do whatever is more convenient for op1 and have op2 do the
// opposite. This ensures that we do at most one shift.
SpeculateWhicheverInt52Operand op1(this, node->child1());
SpeculateWhicheverInt52Operand op2(this, node->child2(), OppositeShift, op1);
GPRTemporary result(this);
GPRReg op1GPR = op1.gpr();
GPRReg op2GPR = op2.gpr();
GPRReg resultGPR = result.gpr();
m_jit.move(op1GPR, resultGPR);
speculationCheck(
Int52Overflow, JSValueRegs(), 0,
m_jit.branchMul64(MacroAssembler::Overflow, op2GPR, resultGPR));
if (shouldCheckNegativeZero(node->arithMode())) {
MacroAssembler::Jump resultNonZero = m_jit.branchTest64(
MacroAssembler::NonZero, resultGPR);
speculationCheck(
NegativeZero, JSValueRegs(), 0,
m_jit.branch64(MacroAssembler::LessThan, op1GPR, TrustedImm64(0)));
speculationCheck(
NegativeZero, JSValueRegs(), 0,
m_jit.branch64(MacroAssembler::LessThan, op2GPR, TrustedImm64(0)));
resultNonZero.link(&m_jit);
}
int52Result(resultGPR, node);
return;
}
#endif // USE(JSVALUE64)
case DoubleRepUse: {
SpeculateDoubleOperand op1(this, node->child1());
SpeculateDoubleOperand op2(this, node->child2());
FPRTemporary result(this, op1, op2);
FPRReg reg1 = op1.fpr();
FPRReg reg2 = op2.fpr();
m_jit.mulDouble(reg1, reg2, result.fpr());
doubleResult(result.fpr(), node);
return;
}
default:
RELEASE_ASSERT_NOT_REACHED();
return;
}
}
void SpeculativeJIT::compileArithDiv(Node* node)
{
switch (node->binaryUseKind()) {
case Int32Use: {
#if CPU(X86) || CPU(X86_64)
SpeculateInt32Operand op1(this, node->child1());
SpeculateInt32Operand op2(this, node->child2());
GPRTemporary eax(this, X86Registers::eax);
GPRTemporary edx(this, X86Registers::edx);
GPRReg op1GPR = op1.gpr();
GPRReg op2GPR = op2.gpr();
GPRReg op2TempGPR;
GPRReg temp;
if (op2GPR == X86Registers::eax || op2GPR == X86Registers::edx) {
op2TempGPR = allocate();
temp = op2TempGPR;
} else {
op2TempGPR = InvalidGPRReg;
if (op1GPR == X86Registers::eax)
temp = X86Registers::edx;
else
temp = X86Registers::eax;
}
ASSERT(temp != op1GPR);
ASSERT(temp != op2GPR);
m_jit.add32(JITCompiler::TrustedImm32(1), op2GPR, temp);
JITCompiler::Jump safeDenominator = m_jit.branch32(JITCompiler::Above, temp, JITCompiler::TrustedImm32(1));
JITCompiler::JumpList done;
if (shouldCheckOverflow(node->arithMode())) {
speculationCheck(Overflow, JSValueRegs(), 0, m_jit.branchTest32(JITCompiler::Zero, op2GPR));
speculationCheck(Overflow, JSValueRegs(), 0, m_jit.branch32(JITCompiler::Equal, op1GPR, TrustedImm32(-2147483647-1)));
} else {
// This is the case where we convert the result to an int after we're done, and we
// already know that the denominator is either -1 or 0. So, if the denominator is
// zero, then the result should be zero. If the denominator is not zero (i.e. it's
// -1) and the numerator is -2^31 then the result should be -2^31. Otherwise we
// are happy to fall through to a normal division, since we're just dividing
// something by negative 1.
JITCompiler::Jump notZero = m_jit.branchTest32(JITCompiler::NonZero, op2GPR);
m_jit.move(TrustedImm32(0), eax.gpr());
done.append(m_jit.jump());
notZero.link(&m_jit);
JITCompiler::Jump notNeg2ToThe31 =
m_jit.branch32(JITCompiler::NotEqual, op1GPR, TrustedImm32(-2147483647-1));
m_jit.zeroExtend32ToPtr(op1GPR, eax.gpr());
done.append(m_jit.jump());
notNeg2ToThe31.link(&m_jit);
}
safeDenominator.link(&m_jit);
// If the user cares about negative zero, then speculate that we're not about
// to produce negative zero.
if (shouldCheckNegativeZero(node->arithMode())) {
MacroAssembler::Jump numeratorNonZero = m_jit.branchTest32(MacroAssembler::NonZero, op1GPR);
speculationCheck(NegativeZero, JSValueRegs(), 0, m_jit.branch32(MacroAssembler::LessThan, op2GPR, TrustedImm32(0)));
numeratorNonZero.link(&m_jit);
}
if (op2TempGPR != InvalidGPRReg) {
m_jit.move(op2GPR, op2TempGPR);
op2GPR = op2TempGPR;
}
m_jit.move(op1GPR, eax.gpr());
m_jit.assembler().cdq();
m_jit.assembler().idivl_r(op2GPR);
if (op2TempGPR != InvalidGPRReg)
unlock(op2TempGPR);
// Check that there was no remainder. If there had been, then we'd be obligated to
// produce a double result instead.
if (shouldCheckOverflow(node->arithMode()))
speculationCheck(Overflow, JSValueRegs(), 0, m_jit.branchTest32(JITCompiler::NonZero, edx.gpr()));
done.link(&m_jit);
int32Result(eax.gpr(), node);
#elif CPU(APPLE_ARMV7S) || CPU(ARM64)
SpeculateInt32Operand op1(this, node->child1());
SpeculateInt32Operand op2(this, node->child2());
GPRReg op1GPR = op1.gpr();
GPRReg op2GPR = op2.gpr();
GPRTemporary quotient(this);
GPRTemporary multiplyAnswer(this);
// If the user cares about negative zero, then speculate that we're not about
// to produce negative zero.
if (shouldCheckNegativeZero(node->arithMode())) {
MacroAssembler::Jump numeratorNonZero = m_jit.branchTest32(MacroAssembler::NonZero, op1GPR);
speculationCheck(NegativeZero, JSValueRegs(), 0, m_jit.branch32(MacroAssembler::LessThan, op2GPR, TrustedImm32(0)));
numeratorNonZero.link(&m_jit);
}
m_jit.assembler().sdiv<32>(quotient.gpr(), op1GPR, op2GPR);
// Check that there was no remainder. If there had been, then we'd be obligated to
// produce a double result instead.
if (shouldCheckOverflow(node->arithMode())) {
speculationCheck(Overflow, JSValueRegs(), 0, m_jit.branchMul32(JITCompiler::Overflow, quotient.gpr(), op2GPR, multiplyAnswer.gpr()));
speculationCheck(Overflow, JSValueRegs(), 0, m_jit.branch32(JITCompiler::NotEqual, multiplyAnswer.gpr(), op1GPR));
}
int32Result(quotient.gpr(), node);
#else
RELEASE_ASSERT_NOT_REACHED();
#endif
break;
}
case DoubleRepUse: {
SpeculateDoubleOperand op1(this, node->child1());
SpeculateDoubleOperand op2(this, node->child2());
FPRTemporary result(this, op1);
FPRReg reg1 = op1.fpr();
FPRReg reg2 = op2.fpr();
m_jit.divDouble(reg1, reg2, result.fpr());
doubleResult(result.fpr(), node);
break;
}
default:
RELEASE_ASSERT_NOT_REACHED();
break;
}
}
void SpeculativeJIT::compileArithMod(Node* node)
{
switch (node->binaryUseKind()) {
case Int32Use: {
// In the fast path, the dividend value could be the final result
// (in case of |dividend| < |divisor|), so we speculate it as strict int32.
SpeculateStrictInt32Operand op1(this, node->child1());
if (isInt32Constant(node->child2().node())) {
int32_t divisor = valueOfInt32Constant(node->child2().node());
if (divisor > 1 && hasOneBitSet(divisor)) {
unsigned logarithm = WTF::fastLog2(divisor);
GPRReg dividendGPR = op1.gpr();
GPRTemporary result(this);
GPRReg resultGPR = result.gpr();
// This is what LLVM generates. It's pretty crazy. Here's my
// attempt at understanding it.
// First, compute either divisor - 1, or 0, depending on whether
// the dividend is negative:
//
// If dividend < 0: resultGPR = divisor - 1
// If dividend >= 0: resultGPR = 0
m_jit.move(dividendGPR, resultGPR);
m_jit.rshift32(TrustedImm32(31), resultGPR);
m_jit.urshift32(TrustedImm32(32 - logarithm), resultGPR);
// Add in the dividend, so that:
//
// If dividend < 0: resultGPR = dividend + divisor - 1
// If dividend >= 0: resultGPR = dividend
m_jit.add32(dividendGPR, resultGPR);
// Mask so as to only get the *high* bits. This rounds down
// (towards negative infinity) resultGPR to the nearest multiple
// of divisor, so that:
//
// If dividend < 0: resultGPR = floor((dividend + divisor - 1) / divisor)
// If dividend >= 0: resultGPR = floor(dividend / divisor)
//
// Note that this can be simplified to:
//
// If dividend < 0: resultGPR = ceil(dividend / divisor)
// If dividend >= 0: resultGPR = floor(dividend / divisor)
//
// Note that if the dividend is negative, resultGPR will also be negative.
// Regardless of the sign of dividend, resultGPR will be rounded towards
// zero, because of how things are conditionalized.
m_jit.and32(TrustedImm32(-divisor), resultGPR);
// Subtract resultGPR from dividendGPR, which yields the remainder:
//
// resultGPR = dividendGPR - resultGPR
m_jit.neg32(resultGPR);
m_jit.add32(dividendGPR, resultGPR);
if (shouldCheckNegativeZero(node->arithMode())) {
// Check that we're not about to create negative zero.
JITCompiler::Jump numeratorPositive = m_jit.branch32(JITCompiler::GreaterThanOrEqual, dividendGPR, TrustedImm32(0));
speculationCheck(NegativeZero, JSValueRegs(), 0, m_jit.branchTest32(JITCompiler::Zero, resultGPR));
numeratorPositive.link(&m_jit);
}
int32Result(resultGPR, node);
return;
}
}
#if CPU(X86) || CPU(X86_64)
if (isInt32Constant(node->child2().node())) {
int32_t divisor = valueOfInt32Constant(node->child2().node());
if (divisor && divisor != -1) {
GPRReg op1Gpr = op1.gpr();
GPRTemporary eax(this, X86Registers::eax);
GPRTemporary edx(this, X86Registers::edx);
GPRTemporary scratch(this);
GPRReg scratchGPR = scratch.gpr();
GPRReg op1SaveGPR;
if (op1Gpr == X86Registers::eax || op1Gpr == X86Registers::edx) {
op1SaveGPR = allocate();
ASSERT(op1Gpr != op1SaveGPR);
m_jit.move(op1Gpr, op1SaveGPR);
} else
op1SaveGPR = op1Gpr;
ASSERT(op1SaveGPR != X86Registers::eax);
ASSERT(op1SaveGPR != X86Registers::edx);
m_jit.move(op1Gpr, eax.gpr());
m_jit.move(TrustedImm32(divisor), scratchGPR);
m_jit.assembler().cdq();
m_jit.assembler().idivl_r(scratchGPR);
if (shouldCheckNegativeZero(node->arithMode())) {
JITCompiler::Jump numeratorPositive = m_jit.branch32(JITCompiler::GreaterThanOrEqual, op1SaveGPR, TrustedImm32(0));
speculationCheck(Overflow, JSValueRegs(), 0, m_jit.branchTest32(JITCompiler::Zero, edx.gpr()));
numeratorPositive.link(&m_jit);
}
if (op1SaveGPR != op1Gpr)
unlock(op1SaveGPR);
int32Result(edx.gpr(), node);
return;
}
}
#endif
SpeculateInt32Operand op2(this, node->child2());
#if CPU(X86) || CPU(X86_64)
GPRTemporary eax(this, X86Registers::eax);
GPRTemporary edx(this, X86Registers::edx);
GPRReg op1GPR = op1.gpr();
GPRReg op2GPR = op2.gpr();
GPRReg op2TempGPR;
GPRReg temp;
GPRReg op1SaveGPR;
if (op2GPR == X86Registers::eax || op2GPR == X86Registers::edx) {
op2TempGPR = allocate();
temp = op2TempGPR;
} else {
op2TempGPR = InvalidGPRReg;
if (op1GPR == X86Registers::eax)
temp = X86Registers::edx;
else
temp = X86Registers::eax;
}
if (op1GPR == X86Registers::eax || op1GPR == X86Registers::edx) {
op1SaveGPR = allocate();
ASSERT(op1GPR != op1SaveGPR);
m_jit.move(op1GPR, op1SaveGPR);
} else
op1SaveGPR = op1GPR;
ASSERT(temp != op1GPR);
ASSERT(temp != op2GPR);
ASSERT(op1SaveGPR != X86Registers::eax);
ASSERT(op1SaveGPR != X86Registers::edx);
m_jit.add32(JITCompiler::TrustedImm32(1), op2GPR, temp);
JITCompiler::Jump safeDenominator = m_jit.branch32(JITCompiler::Above, temp, JITCompiler::TrustedImm32(1));
JITCompiler::JumpList done;
// FIXME: -2^31 / -1 will actually yield negative zero, so we could have a
// separate case for that. But it probably doesn't matter so much.
if (shouldCheckOverflow(node->arithMode())) {
speculationCheck(Overflow, JSValueRegs(), 0, m_jit.branchTest32(JITCompiler::Zero, op2GPR));
speculationCheck(Overflow, JSValueRegs(), 0, m_jit.branch32(JITCompiler::Equal, op1GPR, TrustedImm32(-2147483647-1)));
} else {
// This is the case where we convert the result to an int after we're done, and we
// already know that the denominator is either -1 or 0. So, if the denominator is
// zero, then the result should be zero. If the denominator is not zero (i.e. it's
// -1) and the numerator is -2^31 then the result should be 0. Otherwise we are
// happy to fall through to a normal division, since we're just dividing something
// by negative 1.
JITCompiler::Jump notZero = m_jit.branchTest32(JITCompiler::NonZero, op2GPR);
m_jit.move(TrustedImm32(0), edx.gpr());
done.append(m_jit.jump());
notZero.link(&m_jit);
JITCompiler::Jump notNeg2ToThe31 =
m_jit.branch32(JITCompiler::NotEqual, op1GPR, TrustedImm32(-2147483647-1));
m_jit.move(TrustedImm32(0), edx.gpr());
done.append(m_jit.jump());
notNeg2ToThe31.link(&m_jit);
}
safeDenominator.link(&m_jit);
if (op2TempGPR != InvalidGPRReg) {
m_jit.move(op2GPR, op2TempGPR);
op2GPR = op2TempGPR;
}
m_jit.move(op1GPR, eax.gpr());
m_jit.assembler().cdq();
m_jit.assembler().idivl_r(op2GPR);
if (op2TempGPR != InvalidGPRReg)
unlock(op2TempGPR);
// Check that we're not about to create negative zero.
if (shouldCheckNegativeZero(node->arithMode())) {
JITCompiler::Jump numeratorPositive = m_jit.branch32(JITCompiler::GreaterThanOrEqual, op1SaveGPR, TrustedImm32(0));
speculationCheck(Overflow, JSValueRegs(), 0, m_jit.branchTest32(JITCompiler::Zero, edx.gpr()));
numeratorPositive.link(&m_jit);
}
if (op1SaveGPR != op1GPR)
unlock(op1SaveGPR);
done.link(&m_jit);
int32Result(edx.gpr(), node);
#elif CPU(ARM64) || CPU(APPLE_ARMV7S)
GPRTemporary temp(this);
GPRTemporary quotientThenRemainder(this);
GPRTemporary multiplyAnswer(this);
GPRReg dividendGPR = op1.gpr();
GPRReg divisorGPR = op2.gpr();
GPRReg quotientThenRemainderGPR = quotientThenRemainder.gpr();
GPRReg multiplyAnswerGPR = multiplyAnswer.gpr();
JITCompiler::JumpList done;
if (shouldCheckOverflow(node->arithMode()))
speculationCheck(Overflow, JSValueRegs(), 0, m_jit.branchTest32(JITCompiler::Zero, divisorGPR));
else {
JITCompiler::Jump denominatorNotZero = m_jit.branchTest32(JITCompiler::NonZero, divisorGPR);
m_jit.move(divisorGPR, quotientThenRemainderGPR);
done.append(m_jit.jump());
denominatorNotZero.link(&m_jit);
}
m_jit.assembler().sdiv<32>(quotientThenRemainderGPR, dividendGPR, divisorGPR);
// FIXME: It seems like there are cases where we don't need this? What if we have
// arithMode() == Arith::Unchecked?
// https://bugs.webkit.org/show_bug.cgi?id=126444
speculationCheck(Overflow, JSValueRegs(), 0, m_jit.branchMul32(JITCompiler::Overflow, quotientThenRemainderGPR, divisorGPR, multiplyAnswerGPR));
#if CPU(APPLE_ARMV7S)
m_jit.assembler().sub(quotientThenRemainderGPR, dividendGPR, multiplyAnswerGPR);
#else
m_jit.assembler().sub<32>(quotientThenRemainderGPR, dividendGPR, multiplyAnswerGPR);
#endif
// If the user cares about negative zero, then speculate that we're not about
// to produce negative zero.
if (shouldCheckNegativeZero(node->arithMode())) {
// Check that we're not about to create negative zero.
JITCompiler::Jump numeratorPositive = m_jit.branch32(JITCompiler::GreaterThanOrEqual, dividendGPR, TrustedImm32(0));
speculationCheck(Overflow, JSValueRegs(), 0, m_jit.branchTest32(JITCompiler::Zero, quotientThenRemainderGPR));
numeratorPositive.link(&m_jit);
}
done.link(&m_jit);
int32Result(quotientThenRemainderGPR, node);
#else // not architecture that can do integer division
RELEASE_ASSERT_NOT_REACHED();
#endif
return;
}
case DoubleRepUse: {
SpeculateDoubleOperand op1(this, node->child1());
SpeculateDoubleOperand op2(this, node->child2());
FPRReg op1FPR = op1.fpr();
FPRReg op2FPR = op2.fpr();
flushRegisters();
FPRResult result(this);
callOperation(fmodAsDFGOperation, result.fpr(), op1FPR, op2FPR);
doubleResult(result.fpr(), node);
return;
}
default:
RELEASE_ASSERT_NOT_REACHED();
return;
}
}
// Returns true if the compare is fused with a subsequent branch.
bool SpeculativeJIT::compare(Node* node, MacroAssembler::RelationalCondition condition, MacroAssembler::DoubleCondition doubleCondition, S_JITOperation_EJJ operation)
{
if (compilePeepHoleBranch(node, condition, doubleCondition, operation))
return true;
if (node->isBinaryUseKind(Int32Use)) {
compileInt32Compare(node, condition);
return false;
}
#if USE(JSVALUE64)
if (node->isBinaryUseKind(Int52RepUse)) {
compileInt52Compare(node, condition);
return false;
}
#endif // USE(JSVALUE64)
if (node->isBinaryUseKind(DoubleRepUse)) {
compileDoubleCompare(node, doubleCondition);
return false;
}
if (node->op() == CompareEq) {
if (node->isBinaryUseKind(StringUse)) {
compileStringEquality(node);
return false;
}
if (node->isBinaryUseKind(BooleanUse)) {
compileBooleanCompare(node, condition);
return false;
}
if (node->isBinaryUseKind(StringIdentUse)) {
compileStringIdentEquality(node);
return false;
}
if (node->isBinaryUseKind(ObjectUse)) {
compileObjectEquality(node);
return false;
}
if (node->isBinaryUseKind(ObjectUse, ObjectOrOtherUse)) {
compileObjectToObjectOrOtherEquality(node->child1(), node->child2());
return false;
}
if (node->isBinaryUseKind(ObjectOrOtherUse, ObjectUse)) {
compileObjectToObjectOrOtherEquality(node->child2(), node->child1());
return false;
}
}
nonSpeculativeNonPeepholeCompare(node, condition, operation);
return false;
}
bool SpeculativeJIT::compileStrictEq(Node* node)
{
if (node->isBinaryUseKind(BooleanUse)) {
unsigned branchIndexInBlock = detectPeepHoleBranch();
if (branchIndexInBlock != UINT_MAX) {
Node* branchNode = m_block->at(branchIndexInBlock);
compilePeepHoleBooleanBranch(node, branchNode, MacroAssembler::Equal);
use(node->child1());
use(node->child2());
m_indexInBlock = branchIndexInBlock;
m_currentNode = branchNode;
return true;
}
compileBooleanCompare(node, MacroAssembler::Equal);
return false;
}
if (node->isBinaryUseKind(Int32Use)) {
unsigned branchIndexInBlock = detectPeepHoleBranch();
if (branchIndexInBlock != UINT_MAX) {
Node* branchNode = m_block->at(branchIndexInBlock);
compilePeepHoleInt32Branch(node, branchNode, MacroAssembler::Equal);
use(node->child1());
use(node->child2());
m_indexInBlock = branchIndexInBlock;
m_currentNode = branchNode;
return true;
}
compileInt32Compare(node, MacroAssembler::Equal);
return false;
}
#if USE(JSVALUE64)
if (node->isBinaryUseKind(Int52RepUse)) {
unsigned branchIndexInBlock = detectPeepHoleBranch();
if (branchIndexInBlock != UINT_MAX) {
Node* branchNode = m_block->at(branchIndexInBlock);
compilePeepHoleInt52Branch(node, branchNode, MacroAssembler::Equal);
use(node->child1());
use(node->child2());
m_indexInBlock = branchIndexInBlock;
m_currentNode = branchNode;
return true;
}
compileInt52Compare(node, MacroAssembler::Equal);
return false;
}
#endif // USE(JSVALUE64)
if (node->isBinaryUseKind(DoubleRepUse)) {
unsigned branchIndexInBlock = detectPeepHoleBranch();
if (branchIndexInBlock != UINT_MAX) {
Node* branchNode = m_block->at(branchIndexInBlock);
compilePeepHoleDoubleBranch(node, branchNode, MacroAssembler::DoubleEqual);
use(node->child1());
use(node->child2());
m_indexInBlock = branchIndexInBlock;
m_currentNode = branchNode;
return true;
}
compileDoubleCompare(node, MacroAssembler::DoubleEqual);
return false;
}
if (node->isBinaryUseKind(StringUse)) {
compileStringEquality(node);
return false;
}
if (node->isBinaryUseKind(StringIdentUse)) {
compileStringIdentEquality(node);
return false;
}
if (node->isBinaryUseKind(ObjectUse)) {
unsigned branchIndexInBlock = detectPeepHoleBranch();
if (branchIndexInBlock != UINT_MAX) {
Node* branchNode = m_block->at(branchIndexInBlock);
compilePeepHoleObjectEquality(node, branchNode);
use(node->child1());
use(node->child2());
m_indexInBlock = branchIndexInBlock;
m_currentNode = branchNode;
return true;
}
compileObjectEquality(node);
return false;
}
if (node->isBinaryUseKind(MiscUse, UntypedUse)
|| node->isBinaryUseKind(UntypedUse, MiscUse)) {
compileMiscStrictEq(node);
return false;
}
if (node->isBinaryUseKind(StringIdentUse, NotStringVarUse)) {
compileStringIdentToNotStringVarEquality(node, node->child1(), node->child2());
return false;
}
if (node->isBinaryUseKind(NotStringVarUse, StringIdentUse)) {
compileStringIdentToNotStringVarEquality(node, node->child2(), node->child1());
return false;
}
if (node->isBinaryUseKind(StringUse, UntypedUse)) {
compileStringToUntypedEquality(node, node->child1(), node->child2());
return false;
}
if (node->isBinaryUseKind(UntypedUse, StringUse)) {
compileStringToUntypedEquality(node, node->child2(), node->child1());
return false;
}
RELEASE_ASSERT(node->isBinaryUseKind(UntypedUse));
return nonSpeculativeStrictEq(node);
}
void SpeculativeJIT::compileBooleanCompare(Node* node, MacroAssembler::RelationalCondition condition)
{
SpeculateBooleanOperand op1(this, node->child1());
SpeculateBooleanOperand op2(this, node->child2());
GPRTemporary result(this);
m_jit.compare32(condition, op1.gpr(), op2.gpr(), result.gpr());
unblessedBooleanResult(result.gpr(), node);
}
void SpeculativeJIT::compileStringEquality(
Node* node, GPRReg leftGPR, GPRReg rightGPR, GPRReg lengthGPR, GPRReg leftTempGPR,
GPRReg rightTempGPR, GPRReg leftTemp2GPR, GPRReg rightTemp2GPR,
JITCompiler::JumpList fastTrue, JITCompiler::JumpList fastFalse)
{
JITCompiler::JumpList trueCase;
JITCompiler::JumpList falseCase;
JITCompiler::JumpList slowCase;
trueCase.append(fastTrue);
falseCase.append(fastFalse);
m_jit.load32(MacroAssembler::Address(leftGPR, JSString::offsetOfLength()), lengthGPR);
falseCase.append(m_jit.branch32(
MacroAssembler::NotEqual,
MacroAssembler::Address(rightGPR, JSString::offsetOfLength()),
lengthGPR));
trueCase.append(m_jit.branchTest32(MacroAssembler::Zero, lengthGPR));
m_jit.loadPtr(MacroAssembler::Address(leftGPR, JSString::offsetOfValue()), leftTempGPR);
m_jit.loadPtr(MacroAssembler::Address(rightGPR, JSString::offsetOfValue()), rightTempGPR);
slowCase.append(m_jit.branchTestPtr(MacroAssembler::Zero, leftTempGPR));
slowCase.append(m_jit.branchTestPtr(MacroAssembler::Zero, rightTempGPR));
slowCase.append(m_jit.branchTest32(
MacroAssembler::Zero,
MacroAssembler::Address(leftTempGPR, StringImpl::flagsOffset()),
TrustedImm32(StringImpl::flagIs8Bit())));
slowCase.append(m_jit.branchTest32(
MacroAssembler::Zero,
MacroAssembler::Address(rightTempGPR, StringImpl::flagsOffset()),
TrustedImm32(StringImpl::flagIs8Bit())));
m_jit.loadPtr(MacroAssembler::Address(leftTempGPR, StringImpl::dataOffset()), leftTempGPR);
m_jit.loadPtr(MacroAssembler::Address(rightTempGPR, StringImpl::dataOffset()), rightTempGPR);
MacroAssembler::Label loop = m_jit.label();
m_jit.sub32(TrustedImm32(1), lengthGPR);
// This isn't going to generate the best code on x86. But that's OK, it's still better
// than not inlining.
m_jit.load8(MacroAssembler::BaseIndex(leftTempGPR, lengthGPR, MacroAssembler::TimesOne), leftTemp2GPR);
m_jit.load8(MacroAssembler::BaseIndex(rightTempGPR, lengthGPR, MacroAssembler::TimesOne), rightTemp2GPR);
falseCase.append(m_jit.branch32(MacroAssembler::NotEqual, leftTemp2GPR, rightTemp2GPR));
m_jit.branchTest32(MacroAssembler::NonZero, lengthGPR).linkTo(loop, &m_jit);
trueCase.link(&m_jit);
moveTrueTo(leftTempGPR);
JITCompiler::Jump done = m_jit.jump();
falseCase.link(&m_jit);
moveFalseTo(leftTempGPR);
done.link(&m_jit);
addSlowPathGenerator(
slowPathCall(
slowCase, this, operationCompareStringEq, leftTempGPR, leftGPR, rightGPR));
blessedBooleanResult(leftTempGPR, node);
}
void SpeculativeJIT::compileStringEquality(Node* node)
{
SpeculateCellOperand left(this, node->child1());
SpeculateCellOperand right(this, node->child2());
GPRTemporary length(this);
GPRTemporary leftTemp(this);
GPRTemporary rightTemp(this);
GPRTemporary leftTemp2(this, Reuse, left);
GPRTemporary rightTemp2(this, Reuse, right);
GPRReg leftGPR = left.gpr();
GPRReg rightGPR = right.gpr();
GPRReg lengthGPR = length.gpr();
GPRReg leftTempGPR = leftTemp.gpr();
GPRReg rightTempGPR = rightTemp.gpr();
GPRReg leftTemp2GPR = leftTemp2.gpr();
GPRReg rightTemp2GPR = rightTemp2.gpr();
speculateString(node->child1(), leftGPR);
// It's safe to branch around the type check below, since proving that the values are
// equal does indeed prove that the right value is a string.
JITCompiler::Jump fastTrue = m_jit.branchPtr(MacroAssembler::Equal, leftGPR, rightGPR);
speculateString(node->child2(), rightGPR);
compileStringEquality(
node, leftGPR, rightGPR, lengthGPR, leftTempGPR, rightTempGPR, leftTemp2GPR,
rightTemp2GPR, fastTrue, JITCompiler::Jump());
}
void SpeculativeJIT::compileStringToUntypedEquality(Node* node, Edge stringEdge, Edge untypedEdge)
{
SpeculateCellOperand left(this, stringEdge);
JSValueOperand right(this, untypedEdge, ManualOperandSpeculation);
GPRTemporary length(this);
GPRTemporary leftTemp(this);
GPRTemporary rightTemp(this);
GPRTemporary leftTemp2(this, Reuse, left);
GPRTemporary rightTemp2(this);
GPRReg leftGPR = left.gpr();
JSValueRegs rightRegs = right.jsValueRegs();
GPRReg lengthGPR = length.gpr();
GPRReg leftTempGPR = leftTemp.gpr();
GPRReg rightTempGPR = rightTemp.gpr();
GPRReg leftTemp2GPR = leftTemp2.gpr();
GPRReg rightTemp2GPR = rightTemp2.gpr();
speculateString(stringEdge, leftGPR);
JITCompiler::JumpList fastTrue;
JITCompiler::JumpList fastFalse;
fastFalse.append(branchNotCell(rightRegs));
// It's safe to branch around the type check below, since proving that the values are
// equal does indeed prove that the right value is a string.
fastTrue.append(m_jit.branchPtr(
MacroAssembler::Equal, leftGPR, rightRegs.payloadGPR()));
fastFalse.append(m_jit.branchStructurePtr(
MacroAssembler::NotEqual,
MacroAssembler::Address(rightRegs.payloadGPR(), JSCell::structureIDOffset()),
m_jit.vm()->stringStructure.get()));
compileStringEquality(
node, leftGPR, rightRegs.payloadGPR(), lengthGPR, leftTempGPR, rightTempGPR, leftTemp2GPR,
rightTemp2GPR, fastTrue, fastFalse);
}
void SpeculativeJIT::compileStringIdentEquality(Node* node)
{
SpeculateCellOperand left(this, node->child1());
SpeculateCellOperand right(this, node->child2());
GPRTemporary leftTemp(this);
GPRTemporary rightTemp(this);
GPRReg leftGPR = left.gpr();
GPRReg rightGPR = right.gpr();
GPRReg leftTempGPR = leftTemp.gpr();
GPRReg rightTempGPR = rightTemp.gpr();
speculateString(node->child1(), leftGPR);
speculateString(node->child2(), rightGPR);
speculateStringIdentAndLoadStorage(node->child1(), leftGPR, leftTempGPR);
speculateStringIdentAndLoadStorage(node->child2(), rightGPR, rightTempGPR);
m_jit.comparePtr(MacroAssembler::Equal, leftTempGPR, rightTempGPR, leftTempGPR);
unblessedBooleanResult(leftTempGPR, node);
}
void SpeculativeJIT::compileStringIdentToNotStringVarEquality(
Node* node, Edge stringEdge, Edge notStringVarEdge)
{
SpeculateCellOperand left(this, stringEdge);
JSValueOperand right(this, notStringVarEdge, ManualOperandSpeculation);
GPRTemporary leftTemp(this);
GPRTemporary rightTemp(this);
GPRReg leftTempGPR = leftTemp.gpr();
GPRReg rightTempGPR = rightTemp.gpr();
GPRReg leftGPR = left.gpr();
JSValueRegs rightRegs = right.jsValueRegs();
speculateString(stringEdge, leftGPR);
speculateStringIdentAndLoadStorage(stringEdge, leftGPR, leftTempGPR);
moveFalseTo(rightTempGPR);
JITCompiler::JumpList notString;
notString.append(branchNotCell(rightRegs));
notString.append(m_jit.branchStructurePtr(
MacroAssembler::NotEqual,
MacroAssembler::Address(rightRegs.payloadGPR(), JSCell::structureIDOffset()),
m_jit.vm()->stringStructure.get()));
speculateStringIdentAndLoadStorage(notStringVarEdge, rightRegs.payloadGPR(), rightTempGPR);
m_jit.comparePtr(MacroAssembler::Equal, leftTempGPR, rightTempGPR, rightTempGPR);
notString.link(&m_jit);
unblessedBooleanResult(rightTempGPR, node);
}
void SpeculativeJIT::compileStringZeroLength(Node* node)
{
SpeculateCellOperand str(this, node->child1());
GPRReg strGPR = str.gpr();
// Make sure that this is a string.
speculateString(node->child1(), strGPR);
GPRTemporary eq(this);
GPRReg eqGPR = eq.gpr();
// Fetch the length field from the string object.
m_jit.test32(MacroAssembler::Zero, MacroAssembler::Address(strGPR, JSString::offsetOfLength()), MacroAssembler::TrustedImm32(-1), eqGPR);
unblessedBooleanResult(eqGPR, node);
}
void SpeculativeJIT::compileConstantStoragePointer(Node* node)
{
GPRTemporary storage(this);
GPRReg storageGPR = storage.gpr();
m_jit.move(TrustedImmPtr(node->storagePointer()), storageGPR);
storageResult(storageGPR, node);
}
void SpeculativeJIT::compileGetIndexedPropertyStorage(Node* node)
{
SpeculateCellOperand base(this, node->child1());
GPRReg baseReg = base.gpr();
GPRTemporary storage(this);
GPRReg storageReg = storage.gpr();
switch (node->arrayMode().type()) {
case Array::String:
m_jit.loadPtr(MacroAssembler::Address(baseReg, JSString::offsetOfValue()), storageReg);
addSlowPathGenerator(
slowPathCall(
m_jit.branchTest32(MacroAssembler::Zero, storageReg),
this, operationResolveRope, storageReg, baseReg));
m_jit.loadPtr(MacroAssembler::Address(storageReg, StringImpl::dataOffset()), storageReg);
break;
default:
ASSERT(isTypedView(node->arrayMode().typedArrayType()));
m_jit.loadPtr(
MacroAssembler::Address(baseReg, JSArrayBufferView::offsetOfVector()),
storageReg);
break;
}
storageResult(storageReg, node);
}
void SpeculativeJIT::compileGetTypedArrayByteOffset(Node* node)
{
SpeculateCellOperand base(this, node->child1());
GPRTemporary vector(this);
GPRTemporary data(this);
GPRReg baseGPR = base.gpr();
GPRReg vectorGPR = vector.gpr();
GPRReg dataGPR = data.gpr();
JITCompiler::Jump emptyByteOffset = m_jit.branch32(
MacroAssembler::NotEqual,
MacroAssembler::Address(baseGPR, JSArrayBufferView::offsetOfMode()),
TrustedImm32(WastefulTypedArray));
m_jit.loadPtr(MacroAssembler::Address(baseGPR, JSObject::butterflyOffset()), dataGPR);
m_jit.loadPtr(MacroAssembler::Address(baseGPR, JSArrayBufferView::offsetOfVector()), vectorGPR);
m_jit.loadPtr(MacroAssembler::Address(dataGPR, Butterfly::offsetOfArrayBuffer()), dataGPR);
m_jit.loadPtr(MacroAssembler::Address(dataGPR, ArrayBuffer::offsetOfData()), dataGPR);
m_jit.subPtr(dataGPR, vectorGPR);
JITCompiler::Jump done = m_jit.jump();
emptyByteOffset.link(&m_jit);
m_jit.move(TrustedImmPtr(0), vectorGPR);
done.link(&m_jit);
int32Result(vectorGPR, node);
}
void SpeculativeJIT::compileGetByValOnArguments(Node* node)
{
SpeculateCellOperand base(this, node->child1());
SpeculateStrictInt32Operand property(this, node->child2());
GPRTemporary result(this);
#if USE(JSVALUE32_64)
GPRTemporary resultTag(this);
#endif
GPRTemporary scratch(this);
GPRReg baseReg = base.gpr();
GPRReg propertyReg = property.gpr();
GPRReg resultReg = result.gpr();
#if USE(JSVALUE32_64)
GPRReg resultTagReg = resultTag.gpr();
#endif
GPRReg scratchReg = scratch.gpr();
if (!m_compileOkay)
return;
ASSERT(ArrayMode(Array::Arguments).alreadyChecked(m_jit.graph(), node, m_state.forNode(node->child1())));
// Two really lame checks.
speculationCheck(
Uncountable, JSValueSource(), 0,
m_jit.branch32(
MacroAssembler::AboveOrEqual, propertyReg,
MacroAssembler::Address(baseReg, Arguments::offsetOfNumArguments())));
speculationCheck(
Uncountable, JSValueSource(), 0,
m_jit.branchTestPtr(
MacroAssembler::NonZero,
MacroAssembler::Address(
baseReg, Arguments::offsetOfSlowArgumentData())));
m_jit.move(propertyReg, resultReg);
m_jit.signExtend32ToPtr(resultReg, resultReg);
m_jit.loadPtr(
MacroAssembler::Address(baseReg, Arguments::offsetOfRegisters()),
scratchReg);
#if USE(JSVALUE32_64)
m_jit.load32(
MacroAssembler::BaseIndex(
scratchReg, resultReg, MacroAssembler::TimesEight,
CallFrame::thisArgumentOffset() * sizeof(Register) + sizeof(Register) +
OBJECT_OFFSETOF(JSValue, u.asBits.tag)),
resultTagReg);
m_jit.load32(
MacroAssembler::BaseIndex(
scratchReg, resultReg, MacroAssembler::TimesEight,
CallFrame::thisArgumentOffset() * sizeof(Register) + sizeof(Register) +
OBJECT_OFFSETOF(JSValue, u.asBits.payload)),
resultReg);
jsValueResult(resultTagReg, resultReg, node);
#else
m_jit.load64(
MacroAssembler::BaseIndex(
scratchReg, resultReg, MacroAssembler::TimesEight,
CallFrame::thisArgumentOffset() * sizeof(Register) + sizeof(Register)),
resultReg);
jsValueResult(resultReg, node);
#endif
}
void SpeculativeJIT::compileGetArgumentsLength(Node* node)
{
SpeculateCellOperand base(this, node->child1());
GPRTemporary result(this, Reuse, base);
GPRReg baseReg = base.gpr();
GPRReg resultReg = result.gpr();
if (!m_compileOkay)
return;
ASSERT(ArrayMode(Array::Arguments).alreadyChecked(m_jit.graph(), node, m_state.forNode(node->child1())));
speculationCheck(
Uncountable, JSValueSource(), 0,
m_jit.branchTest8(
MacroAssembler::NonZero,
MacroAssembler::Address(baseReg, Arguments::offsetOfOverrodeLength())));
m_jit.load32(
MacroAssembler::Address(baseReg, Arguments::offsetOfNumArguments()),
resultReg);
int32Result(resultReg, node);
}
void SpeculativeJIT::compileGetArrayLength(Node* node)
{
switch (node->arrayMode().type()) {
case Array::Int32:
case Array::Double:
case Array::Contiguous: {
StorageOperand storage(this, node->child2());
GPRTemporary result(this, Reuse, storage);
GPRReg storageReg = storage.gpr();
GPRReg resultReg = result.gpr();
m_jit.load32(MacroAssembler::Address(storageReg, Butterfly::offsetOfPublicLength()), resultReg);
int32Result(resultReg, node);
break;
}
case Array::ArrayStorage:
case Array::SlowPutArrayStorage: {
StorageOperand storage(this, node->child2());
GPRTemporary result(this, Reuse, storage);
GPRReg storageReg = storage.gpr();
GPRReg resultReg = result.gpr();
m_jit.load32(MacroAssembler::Address(storageReg, Butterfly::offsetOfPublicLength()), resultReg);
speculationCheck(Uncountable, JSValueRegs(), 0, m_jit.branch32(MacroAssembler::LessThan, resultReg, MacroAssembler::TrustedImm32(0)));
int32Result(resultReg, node);
break;
}
case Array::String: {
SpeculateCellOperand base(this, node->child1());
GPRTemporary result(this, Reuse, base);
GPRReg baseGPR = base.gpr();
GPRReg resultGPR = result.gpr();
m_jit.load32(MacroAssembler::Address(baseGPR, JSString::offsetOfLength()), resultGPR);
int32Result(resultGPR, node);
break;
}
case Array::Arguments: {
compileGetArgumentsLength(node);
break;
}
default: {
ASSERT(isTypedView(node->arrayMode().typedArrayType()));
SpeculateCellOperand base(this, node->child1());
GPRTemporary result(this, Reuse, base);
GPRReg baseGPR = base.gpr();
GPRReg resultGPR = result.gpr();
m_jit.load32(MacroAssembler::Address(baseGPR, JSArrayBufferView::offsetOfLength()), resultGPR);
int32Result(resultGPR, node);
break;
} }
}
void SpeculativeJIT::compileNewFunctionNoCheck(Node* node)
{
GPRResult result(this);
GPRReg resultGPR = result.gpr();
flushRegisters();
callOperation(
operationNewFunctionNoCheck, resultGPR, m_jit.codeBlock()->functionDecl(node->functionDeclIndex()));
cellResult(resultGPR, node);
}
void SpeculativeJIT::compileNewFunctionExpression(Node* node)
{
GPRResult result(this);
GPRReg resultGPR = result.gpr();
flushRegisters();
callOperation(
operationNewFunctionNoCheck,
resultGPR,
m_jit.codeBlock()->functionExpr(node->functionExprIndex()));
cellResult(resultGPR, node);
}
bool SpeculativeJIT::compileRegExpExec(Node* node)
{
unsigned branchIndexInBlock = detectPeepHoleBranch();
if (branchIndexInBlock == UINT_MAX)
return false;
Node* branchNode = m_block->at(branchIndexInBlock);
ASSERT(node->adjustedRefCount() == 1);
BasicBlock* taken = branchNode->branchData()->taken.block;
BasicBlock* notTaken = branchNode->branchData()->notTaken.block;
bool invert = false;
if (taken == nextBlock()) {
invert = true;
BasicBlock* tmp = taken;
taken = notTaken;
notTaken = tmp;
}
SpeculateCellOperand base(this, node->child1());
SpeculateCellOperand argument(this, node->child2());
GPRReg baseGPR = base.gpr();
GPRReg argumentGPR = argument.gpr();
flushRegisters();
GPRResult result(this);
callOperation(operationRegExpTest, result.gpr(), baseGPR, argumentGPR);
branchTest32(invert ? JITCompiler::Zero : JITCompiler::NonZero, result.gpr(), taken);
jump(notTaken);
use(node->child1());
use(node->child2());
m_indexInBlock = branchIndexInBlock;
m_currentNode = branchNode;
return true;
}
void SpeculativeJIT::compileAllocatePropertyStorage(Node* node)
{
if (node->structureTransitionData().previousStructure->couldHaveIndexingHeader()) {
SpeculateCellOperand base(this, node->child1());
GPRReg baseGPR = base.gpr();
flushRegisters();
GPRResult result(this);
callOperation(operationReallocateButterflyToHavePropertyStorageWithInitialCapacity, result.gpr(), baseGPR);
storageResult(result.gpr(), node);
return;
}
SpeculateCellOperand base(this, node->child1());
GPRTemporary scratch1(this);
GPRReg baseGPR = base.gpr();
GPRReg scratchGPR1 = scratch1.gpr();
ASSERT(!node->structureTransitionData().previousStructure->outOfLineCapacity());
ASSERT(initialOutOfLineCapacity == node->structureTransitionData().newStructure->outOfLineCapacity());
JITCompiler::Jump slowPath =
emitAllocateBasicStorage(
TrustedImm32(initialOutOfLineCapacity * sizeof(JSValue)), scratchGPR1);
m_jit.addPtr(JITCompiler::TrustedImm32(sizeof(IndexingHeader)), scratchGPR1);
addSlowPathGenerator(
slowPathCall(slowPath, this, operationAllocatePropertyStorageWithInitialCapacity, scratchGPR1));
m_jit.storePtr(scratchGPR1, JITCompiler::Address(baseGPR, JSObject::butterflyOffset()));
storageResult(scratchGPR1, node);
}
void SpeculativeJIT::compileReallocatePropertyStorage(Node* node)
{
size_t oldSize = node->structureTransitionData().previousStructure->outOfLineCapacity() * sizeof(JSValue);
size_t newSize = oldSize * outOfLineGrowthFactor;
ASSERT(newSize == node->structureTransitionData().newStructure->outOfLineCapacity() * sizeof(JSValue));
if (node->structureTransitionData().previousStructure->couldHaveIndexingHeader()) {
SpeculateCellOperand base(this, node->child1());
GPRReg baseGPR = base.gpr();
flushRegisters();
GPRResult result(this);
callOperation(operationReallocateButterflyToGrowPropertyStorage, result.gpr(), baseGPR, newSize / sizeof(JSValue));
storageResult(result.gpr(), node);
return;
}
SpeculateCellOperand base(this, node->child1());
StorageOperand oldStorage(this, node->child2());
GPRTemporary scratch1(this);
GPRTemporary scratch2(this);
GPRReg baseGPR = base.gpr();
GPRReg oldStorageGPR = oldStorage.gpr();
GPRReg scratchGPR1 = scratch1.gpr();
GPRReg scratchGPR2 = scratch2.gpr();
JITCompiler::Jump slowPath =
emitAllocateBasicStorage(TrustedImm32(newSize), scratchGPR1);
m_jit.addPtr(JITCompiler::TrustedImm32(sizeof(IndexingHeader)), scratchGPR1);
addSlowPathGenerator(
slowPathCall(slowPath, this, operationAllocatePropertyStorage, scratchGPR1, newSize / sizeof(JSValue)));
// We have scratchGPR1 = new storage, scratchGPR2 = scratch
for (ptrdiff_t offset = 0; offset < static_cast<ptrdiff_t>(oldSize); offset += sizeof(void*)) {
m_jit.loadPtr(JITCompiler::Address(oldStorageGPR, -(offset + sizeof(JSValue) + sizeof(void*))), scratchGPR2);
m_jit.storePtr(scratchGPR2, JITCompiler::Address(scratchGPR1, -(offset + sizeof(JSValue) + sizeof(void*))));
}
m_jit.storePtr(scratchGPR1, JITCompiler::Address(baseGPR, JSObject::butterflyOffset()));
storageResult(scratchGPR1, node);
}
GPRReg SpeculativeJIT::temporaryRegisterForPutByVal(GPRTemporary& temporary, ArrayMode arrayMode)
{
if (!putByValWillNeedExtraRegister(arrayMode))
return InvalidGPRReg;
GPRTemporary realTemporary(this);
temporary.adopt(realTemporary);
return temporary.gpr();
}
void SpeculativeJIT::compileToStringOnCell(Node* node)
{
SpeculateCellOperand op1(this, node->child1());
GPRReg op1GPR = op1.gpr();
switch (node->child1().useKind()) {
case StringObjectUse: {
GPRTemporary result(this);
GPRReg resultGPR = result.gpr();
speculateStringObject(node->child1(), op1GPR);
m_interpreter.filter(node->child1(), SpecStringObject);
m_jit.loadPtr(JITCompiler::Address(op1GPR, JSWrapperObject::internalValueCellOffset()), resultGPR);
cellResult(resultGPR, node);
break;
}
case StringOrStringObjectUse: {
GPRTemporary result(this);
GPRReg resultGPR = result.gpr();
m_jit.load32(JITCompiler::Address(op1GPR, JSCell::structureIDOffset()), resultGPR);
JITCompiler::Jump isString = m_jit.branchStructurePtr(
JITCompiler::Equal,
resultGPR,
m_jit.vm()->stringStructure.get());
speculateStringObjectForStructure(node->child1(), resultGPR);
m_jit.loadPtr(JITCompiler::Address(op1GPR, JSWrapperObject::internalValueCellOffset()), resultGPR);
JITCompiler::Jump done = m_jit.jump();
isString.link(&m_jit);
m_jit.move(op1GPR, resultGPR);
done.link(&m_jit);
m_interpreter.filter(node->child1(), SpecString | SpecStringObject);
cellResult(resultGPR, node);
break;
}
case CellUse: {
GPRResult result(this);
GPRReg resultGPR = result.gpr();
// We flush registers instead of silent spill/fill because in this mode we
// believe that most likely the input is not a string, and we need to take
// slow path.
flushRegisters();
JITCompiler::Jump done;
if (node->child1()->prediction() & SpecString) {
JITCompiler::Jump needCall = m_jit.branchStructurePtr(
JITCompiler::NotEqual,
JITCompiler::Address(op1GPR, JSCell::structureIDOffset()),
m_jit.vm()->stringStructure.get());
m_jit.move(op1GPR, resultGPR);
done = m_jit.jump();
needCall.link(&m_jit);
}
callOperation(operationToStringOnCell, resultGPR, op1GPR);
if (done.isSet())
done.link(&m_jit);
cellResult(resultGPR, node);
break;
}
default:
RELEASE_ASSERT_NOT_REACHED();
}
}
void SpeculativeJIT::compileNewStringObject(Node* node)
{
SpeculateCellOperand operand(this, node->child1());
GPRTemporary result(this);
GPRTemporary scratch1(this);
GPRTemporary scratch2(this);
GPRReg operandGPR = operand.gpr();
GPRReg resultGPR = result.gpr();
GPRReg scratch1GPR = scratch1.gpr();
GPRReg scratch2GPR = scratch2.gpr();
JITCompiler::JumpList slowPath;
emitAllocateJSObject<StringObject>(
resultGPR, TrustedImmPtr(node->structure()), TrustedImmPtr(0), scratch1GPR, scratch2GPR,
slowPath);
m_jit.storePtr(
TrustedImmPtr(StringObject::info()),
JITCompiler::Address(resultGPR, JSDestructibleObject::classInfoOffset()));
#if USE(JSVALUE64)
m_jit.store64(
operandGPR, JITCompiler::Address(resultGPR, JSWrapperObject::internalValueOffset()));
#else
m_jit.store32(
TrustedImm32(JSValue::CellTag),
JITCompiler::Address(resultGPR, JSWrapperObject::internalValueOffset() + OBJECT_OFFSETOF(JSValue, u.asBits.tag)));
m_jit.store32(
operandGPR,
JITCompiler::Address(resultGPR, JSWrapperObject::internalValueOffset() + OBJECT_OFFSETOF(JSValue, u.asBits.payload)));
#endif
addSlowPathGenerator(slowPathCall(
slowPath, this, operationNewStringObject, resultGPR, operandGPR, node->structure()));
cellResult(resultGPR, node);
}
void SpeculativeJIT::compileNewTypedArray(Node* node)
{
JSGlobalObject* globalObject = m_jit.graph().globalObjectFor(node->origin.semantic);
TypedArrayType type = node->typedArrayType();
Structure* structure = globalObject->typedArrayStructure(type);
SpeculateInt32Operand size(this, node->child1());
GPRReg sizeGPR = size.gpr();
GPRTemporary result(this);
GPRTemporary storage(this);
GPRTemporary scratch(this);
GPRTemporary scratch2(this);
GPRReg resultGPR = result.gpr();
GPRReg storageGPR = storage.gpr();
GPRReg scratchGPR = scratch.gpr();
GPRReg scratchGPR2 = scratch2.gpr();
JITCompiler::JumpList slowCases;
slowCases.append(m_jit.branch32(
MacroAssembler::Above, sizeGPR, TrustedImm32(JSArrayBufferView::fastSizeLimit)));
slowCases.append(m_jit.branchTest32(MacroAssembler::Zero, sizeGPR));
m_jit.move(sizeGPR, scratchGPR);
m_jit.lshift32(TrustedImm32(logElementSize(type)), scratchGPR);
if (elementSize(type) < 8) {
m_jit.add32(TrustedImm32(7), scratchGPR);
m_jit.and32(TrustedImm32(~7), scratchGPR);
}
slowCases.append(
emitAllocateBasicStorage(scratchGPR, storageGPR));
m_jit.subPtr(scratchGPR, storageGPR);
emitAllocateJSObject<JSArrayBufferView>(
resultGPR, TrustedImmPtr(structure), TrustedImmPtr(0), scratchGPR, scratchGPR2,
slowCases);
m_jit.storePtr(
storageGPR,
MacroAssembler::Address(resultGPR, JSArrayBufferView::offsetOfVector()));
m_jit.store32(
sizeGPR,
MacroAssembler::Address(resultGPR, JSArrayBufferView::offsetOfLength()));
m_jit.store32(
TrustedImm32(FastTypedArray),
MacroAssembler::Address(resultGPR, JSArrayBufferView::offsetOfMode()));
#if USE(JSVALUE32_64)
MacroAssembler::Jump done = m_jit.branchTest32(MacroAssembler::Zero, sizeGPR);
m_jit.move(sizeGPR, scratchGPR);
if (elementSize(type) != 4) {
if (elementSize(type) > 4)
m_jit.lshift32(TrustedImm32(logElementSize(type) - 2), scratchGPR);
else {
if (elementSize(type) > 1)
m_jit.lshift32(TrustedImm32(logElementSize(type)), scratchGPR);
m_jit.add32(TrustedImm32(3), scratchGPR);
m_jit.urshift32(TrustedImm32(2), scratchGPR);
}
}
MacroAssembler::Label loop = m_jit.label();
m_jit.sub32(TrustedImm32(1), scratchGPR);
m_jit.store32(
TrustedImm32(0),
MacroAssembler::BaseIndex(storageGPR, scratchGPR, MacroAssembler::TimesFour));
m_jit.branchTest32(MacroAssembler::NonZero, scratchGPR).linkTo(loop, &m_jit);
done.link(&m_jit);
#endif // USE(JSVALUE32_64)
addSlowPathGenerator(slowPathCall(
slowCases, this, operationNewTypedArrayWithSizeForType(type),
resultGPR, structure, sizeGPR));
cellResult(resultGPR, node);
}
void SpeculativeJIT::speculateInt32(Edge edge)
{
if (!needsTypeCheck(edge, SpecInt32))
return;
(SpeculateInt32Operand(this, edge)).gpr();
}
void SpeculativeJIT::speculateNumber(Edge edge)
{
if (!needsTypeCheck(edge, SpecBytecodeNumber))
return;
JSValueOperand value(this, edge, ManualOperandSpeculation);
#if USE(JSVALUE64)
GPRReg gpr = value.gpr();
typeCheck(
JSValueRegs(gpr), edge, SpecBytecodeNumber,
m_jit.branchTest64(MacroAssembler::Zero, gpr, GPRInfo::tagTypeNumberRegister));
#else
GPRReg tagGPR = value.tagGPR();
DFG_TYPE_CHECK(
value.jsValueRegs(), edge, ~SpecInt32,
m_jit.branch32(MacroAssembler::Equal, tagGPR, TrustedImm32(JSValue::Int32Tag)));
DFG_TYPE_CHECK(
value.jsValueRegs(), edge, SpecBytecodeNumber,
m_jit.branch32(MacroAssembler::AboveOrEqual, tagGPR, TrustedImm32(JSValue::LowestTag)));
#endif
}
void SpeculativeJIT::speculateDoubleReal(Edge edge)
{
if (!needsTypeCheck(edge, SpecDoubleReal))
return;
SpeculateDoubleOperand operand(this, edge);
FPRReg fpr = operand.fpr();
typeCheck(
JSValueRegs(), edge, SpecDoubleReal,
m_jit.branchDouble(
MacroAssembler::DoubleNotEqualOrUnordered, fpr, fpr));
}
void SpeculativeJIT::speculateBoolean(Edge edge)
{
if (!needsTypeCheck(edge, SpecBoolean))
return;
(SpeculateBooleanOperand(this, edge)).gpr();
}
void SpeculativeJIT::speculateCell(Edge edge)
{
if (!needsTypeCheck(edge, SpecCell))
return;
(SpeculateCellOperand(this, edge)).gpr();
}
void SpeculativeJIT::speculateObject(Edge edge)
{
if (!needsTypeCheck(edge, SpecObject))
return;
SpeculateCellOperand operand(this, edge);
GPRReg gpr = operand.gpr();
DFG_TYPE_CHECK(
JSValueSource::unboxedCell(gpr), edge, SpecObject, m_jit.branchStructurePtr(
MacroAssembler::Equal,
MacroAssembler::Address(gpr, JSCell::structureIDOffset()),
m_jit.vm()->stringStructure.get()));
}
void SpeculativeJIT::speculateFinalObject(Edge edge)
{
if (!needsTypeCheck(edge, SpecFinalObject))
return;
SpeculateCellOperand operand(this, edge);
GPRReg gpr = operand.gpr();
DFG_TYPE_CHECK(
JSValueSource::unboxedCell(gpr), edge, SpecFinalObject, m_jit.branch8(
MacroAssembler::NotEqual,
MacroAssembler::Address(gpr, JSCell::typeInfoTypeOffset()),
TrustedImm32(FinalObjectType)));
}
void SpeculativeJIT::speculateObjectOrOther(Edge edge)
{
if (!needsTypeCheck(edge, SpecObject | SpecOther))
return;
JSValueOperand operand(this, edge, ManualOperandSpeculation);
GPRTemporary temp(this);
GPRReg tempGPR = temp.gpr();
MacroAssembler::Jump notCell = branchNotCell(operand.jsValueRegs());
GPRReg gpr = operand.jsValueRegs().payloadGPR();
DFG_TYPE_CHECK(
operand.jsValueRegs(), edge, (~SpecCell) | SpecObject, m_jit.branchStructurePtr(
MacroAssembler::Equal,
MacroAssembler::Address(gpr, JSCell::structureIDOffset()),
m_jit.vm()->stringStructure.get()));
MacroAssembler::Jump done = m_jit.jump();
notCell.link(&m_jit);
if (needsTypeCheck(edge, SpecCell | SpecOther)) {
typeCheck(
operand.jsValueRegs(), edge, SpecCell | SpecOther,
branchNotOther(operand.jsValueRegs(), tempGPR));
}
done.link(&m_jit);
}
void SpeculativeJIT::speculateString(Edge edge, GPRReg cell)
{
DFG_TYPE_CHECK(
JSValueSource::unboxedCell(cell), edge, SpecString | ~SpecCell,
m_jit.branchStructurePtr(
MacroAssembler::NotEqual,
MacroAssembler::Address(cell, JSCell::structureIDOffset()),
m_jit.vm()->stringStructure.get()));
}
void SpeculativeJIT::speculateStringIdentAndLoadStorage(Edge edge, GPRReg string, GPRReg storage)
{
m_jit.loadPtr(MacroAssembler::Address(string, JSString::offsetOfValue()), storage);
if (!needsTypeCheck(edge, SpecStringIdent | ~SpecString))
return;
speculationCheck(
BadType, JSValueSource::unboxedCell(string), edge,
m_jit.branchTestPtr(MacroAssembler::Zero, storage));
speculationCheck(
BadType, JSValueSource::unboxedCell(string), edge, m_jit.branchTest32(
MacroAssembler::Zero,
MacroAssembler::Address(storage, StringImpl::flagsOffset()),
MacroAssembler::TrustedImm32(StringImpl::flagIsAtomic())));
m_interpreter.filter(edge, SpecStringIdent | ~SpecString);
}
void SpeculativeJIT::speculateStringIdent(Edge edge, GPRReg string)
{
if (!needsTypeCheck(edge, SpecStringIdent))
return;
GPRTemporary temp(this);
speculateStringIdentAndLoadStorage(edge, string, temp.gpr());
}
void SpeculativeJIT::speculateStringIdent(Edge edge)
{
if (!needsTypeCheck(edge, SpecStringIdent))
return;
SpeculateCellOperand operand(this, edge);
GPRReg gpr = operand.gpr();
speculateString(edge, gpr);
speculateStringIdent(edge, gpr);
}
void SpeculativeJIT::speculateString(Edge edge)
{
if (!needsTypeCheck(edge, SpecString))
return;
SpeculateCellOperand operand(this, edge);
speculateString(edge, operand.gpr());
}
void SpeculativeJIT::speculateStringObject(Edge edge, GPRReg gpr)
{
speculateStringObjectForStructure(edge, JITCompiler::Address(gpr, JSCell::structureIDOffset()));
}
void SpeculativeJIT::speculateStringObject(Edge edge)
{
if (!needsTypeCheck(edge, SpecStringObject))
return;
SpeculateCellOperand operand(this, edge);
GPRReg gpr = operand.gpr();
if (!needsTypeCheck(edge, SpecStringObject))
return;
speculateStringObject(edge, gpr);
m_interpreter.filter(edge, SpecStringObject);
}
void SpeculativeJIT::speculateStringOrStringObject(Edge edge)
{
if (!needsTypeCheck(edge, SpecString | SpecStringObject))
return;
SpeculateCellOperand operand(this, edge);
GPRReg gpr = operand.gpr();
if (!needsTypeCheck(edge, SpecString | SpecStringObject))
return;
GPRTemporary structureID(this);
GPRReg structureIDGPR = structureID.gpr();
m_jit.load32(JITCompiler::Address(gpr, JSCell::structureIDOffset()), structureIDGPR);
JITCompiler::Jump isString = m_jit.branchStructurePtr(
JITCompiler::Equal,
structureIDGPR,
m_jit.vm()->stringStructure.get());
speculateStringObjectForStructure(edge, structureIDGPR);
isString.link(&m_jit);
m_interpreter.filter(edge, SpecString | SpecStringObject);
}
void SpeculativeJIT::speculateNotStringVar(Edge edge)
{
JSValueOperand operand(this, edge, ManualOperandSpeculation);
GPRTemporary temp(this);
GPRReg tempGPR = temp.gpr();
JITCompiler::Jump notCell = branchNotCell(operand.jsValueRegs());
GPRReg cell = operand.jsValueRegs().payloadGPR();
JITCompiler::Jump notString = m_jit.branchStructurePtr(
MacroAssembler::NotEqual,
MacroAssembler::Address(cell, JSCell::structureIDOffset()),
m_jit.vm()->stringStructure.get());
speculateStringIdentAndLoadStorage(edge, cell, tempGPR);
notString.link(&m_jit);
notCell.link(&m_jit);
}
void SpeculativeJIT::speculateNotCell(Edge edge)
{
if (!needsTypeCheck(edge, ~SpecCell))
return;
JSValueOperand operand(this, edge, ManualOperandSpeculation);
typeCheck(operand.jsValueRegs(), edge, ~SpecCell, branchIsCell(operand.jsValueRegs()));
}
void SpeculativeJIT::speculateOther(Edge edge)
{
if (!needsTypeCheck(edge, SpecOther))
return;
JSValueOperand operand(this, edge, ManualOperandSpeculation);
GPRTemporary temp(this);
GPRReg tempGPR = temp.gpr();
typeCheck(
operand.jsValueRegs(), edge, SpecOther,
branchNotOther(operand.jsValueRegs(), tempGPR));
}
void SpeculativeJIT::speculateMisc(Edge edge, JSValueRegs regs)
{
#if USE(JSVALUE64)
DFG_TYPE_CHECK(
regs, edge, SpecMisc,
m_jit.branch64(MacroAssembler::Above, regs.gpr(), MacroAssembler::TrustedImm64(TagBitTypeOther | TagBitBool | TagBitUndefined)));
#else
DFG_TYPE_CHECK(
regs, edge, ~SpecInt32,
m_jit.branch32(MacroAssembler::Equal, regs.tagGPR(), MacroAssembler::TrustedImm32(JSValue::Int32Tag)));
DFG_TYPE_CHECK(
regs, edge, SpecMisc,
m_jit.branch32(MacroAssembler::Below, regs.tagGPR(), MacroAssembler::TrustedImm32(JSValue::UndefinedTag)));
#endif
}
void SpeculativeJIT::speculateMisc(Edge edge)
{
if (!needsTypeCheck(edge, SpecMisc))
return;
JSValueOperand operand(this, edge, ManualOperandSpeculation);
speculateMisc(edge, operand.jsValueRegs());
}
void SpeculativeJIT::speculate(Node*, Edge edge)
{
switch (edge.useKind()) {
case UntypedUse:
break;
case KnownInt32Use:
ASSERT(!needsTypeCheck(edge, SpecInt32));
break;
case DoubleRepUse:
ASSERT(!needsTypeCheck(edge, SpecFullDouble));
break;
case Int52RepUse:
ASSERT(!needsTypeCheck(edge, SpecMachineInt));
break;
case KnownCellUse:
ASSERT(!needsTypeCheck(edge, SpecCell));
break;
case KnownStringUse:
ASSERT(!needsTypeCheck(edge, SpecString));
break;
case Int32Use:
speculateInt32(edge);
break;
case NumberUse:
speculateNumber(edge);
break;
case DoubleRepRealUse:
speculateDoubleReal(edge);
break;
#if USE(JSVALUE64)
case MachineIntUse:
speculateMachineInt(edge);
break;
case DoubleRepMachineIntUse:
speculateDoubleRepMachineInt(edge);
break;
#endif
case BooleanUse:
speculateBoolean(edge);
break;
case CellUse:
speculateCell(edge);
break;
case ObjectUse:
speculateObject(edge);
break;
case FinalObjectUse:
speculateFinalObject(edge);
break;
case ObjectOrOtherUse:
speculateObjectOrOther(edge);
break;
case StringIdentUse:
speculateStringIdent(edge);
break;
case StringUse:
speculateString(edge);
break;
case StringObjectUse:
speculateStringObject(edge);
break;
case StringOrStringObjectUse:
speculateStringOrStringObject(edge);
break;
case NotStringVarUse:
speculateNotStringVar(edge);
break;
case NotCellUse:
speculateNotCell(edge);
break;
case OtherUse:
speculateOther(edge);
break;
case MiscUse:
speculateMisc(edge);
break;
default:
RELEASE_ASSERT_NOT_REACHED();
break;
}
}
void SpeculativeJIT::emitSwitchIntJump(
SwitchData* data, GPRReg value, GPRReg scratch)
{
SimpleJumpTable& table = m_jit.codeBlock()->switchJumpTable(data->switchTableIndex);
table.ensureCTITable();
m_jit.sub32(Imm32(table.min), value);
addBranch(
m_jit.branch32(JITCompiler::AboveOrEqual, value, Imm32(table.ctiOffsets.size())),
data->fallThrough.block);
m_jit.move(TrustedImmPtr(table.ctiOffsets.begin()), scratch);
m_jit.loadPtr(JITCompiler::BaseIndex(scratch, value, JITCompiler::timesPtr()), scratch);
m_jit.jump(scratch);
data->didUseJumpTable = true;
}
void SpeculativeJIT::emitSwitchImm(Node* node, SwitchData* data)
{
switch (node->child1().useKind()) {
case Int32Use: {
SpeculateInt32Operand value(this, node->child1());
GPRTemporary temp(this);
emitSwitchIntJump(data, value.gpr(), temp.gpr());
noResult(node);
break;
}
case UntypedUse: {
JSValueOperand value(this, node->child1());
GPRTemporary temp(this);
JSValueRegs valueRegs = value.jsValueRegs();
GPRReg scratch = temp.gpr();
value.use();
#if USE(JSVALUE64)
JITCompiler::Jump notInt = m_jit.branch64(
JITCompiler::Below, valueRegs.gpr(), GPRInfo::tagTypeNumberRegister);
emitSwitchIntJump(data, valueRegs.gpr(), scratch);
notInt.link(&m_jit);
addBranch(
m_jit.branchTest64(
JITCompiler::Zero, valueRegs.gpr(), GPRInfo::tagTypeNumberRegister),
data->fallThrough.block);
silentSpillAllRegisters(scratch);
callOperation(operationFindSwitchImmTargetForDouble, scratch, valueRegs.gpr(), data->switchTableIndex);
silentFillAllRegisters(scratch);
m_jit.jump(scratch);
#else
JITCompiler::Jump notInt = m_jit.branch32(
JITCompiler::NotEqual, valueRegs.tagGPR(), TrustedImm32(JSValue::Int32Tag));
emitSwitchIntJump(data, valueRegs.payloadGPR(), scratch);
notInt.link(&m_jit);
addBranch(
m_jit.branch32(
JITCompiler::AboveOrEqual, valueRegs.tagGPR(),
TrustedImm32(JSValue::LowestTag)),
data->fallThrough.block);
silentSpillAllRegisters(scratch);
callOperation(operationFindSwitchImmTargetForDouble, scratch, valueRegs, data->switchTableIndex);
silentFillAllRegisters(scratch);
m_jit.jump(scratch);
#endif
noResult(node, UseChildrenCalledExplicitly);
break;
}
default:
RELEASE_ASSERT_NOT_REACHED();
break;
}
}
void SpeculativeJIT::emitSwitchCharStringJump(
SwitchData* data, GPRReg value, GPRReg scratch)
{
addBranch(
m_jit.branch32(
MacroAssembler::NotEqual,
MacroAssembler::Address(value, JSString::offsetOfLength()),
TrustedImm32(1)),
data->fallThrough.block);
m_jit.loadPtr(MacroAssembler::Address(value, JSString::offsetOfValue()), scratch);
addSlowPathGenerator(
slowPathCall(
m_jit.branchTestPtr(MacroAssembler::Zero, scratch),
this, operationResolveRope, scratch, value));
m_jit.loadPtr(MacroAssembler::Address(scratch, StringImpl::dataOffset()), value);
JITCompiler::Jump is8Bit = m_jit.branchTest32(
MacroAssembler::NonZero,
MacroAssembler::Address(scratch, StringImpl::flagsOffset()),
TrustedImm32(StringImpl::flagIs8Bit()));
m_jit.load16(MacroAssembler::Address(value), scratch);
JITCompiler::Jump ready = m_jit.jump();
is8Bit.link(&m_jit);
m_jit.load8(MacroAssembler::Address(value), scratch);
ready.link(&m_jit);
emitSwitchIntJump(data, scratch, value);
}
void SpeculativeJIT::emitSwitchChar(Node* node, SwitchData* data)
{
switch (node->child1().useKind()) {
case StringUse: {
SpeculateCellOperand op1(this, node->child1());
GPRTemporary temp(this);
GPRReg op1GPR = op1.gpr();
GPRReg tempGPR = temp.gpr();
op1.use();
speculateString(node->child1(), op1GPR);
emitSwitchCharStringJump(data, op1GPR, tempGPR);
noResult(node, UseChildrenCalledExplicitly);
break;
}
case UntypedUse: {
JSValueOperand op1(this, node->child1());
GPRTemporary temp(this);
JSValueRegs op1Regs = op1.jsValueRegs();
GPRReg tempGPR = temp.gpr();
op1.use();
addBranch(branchNotCell(op1Regs), data->fallThrough.block);
addBranch(
m_jit.branchStructurePtr(
MacroAssembler::NotEqual,
MacroAssembler::Address(op1Regs.payloadGPR(), JSCell::structureIDOffset()),
m_jit.vm()->stringStructure.get()),
data->fallThrough.block);
emitSwitchCharStringJump(data, op1Regs.payloadGPR(), tempGPR);
noResult(node, UseChildrenCalledExplicitly);
break;
}
default:
RELEASE_ASSERT_NOT_REACHED();
break;
}
}
bool SpeculativeJIT::StringSwitchCase::operator<(
const SpeculativeJIT::StringSwitchCase& other) const
{
unsigned minLength = std::min(string->length(), other.string->length());
for (unsigned i = 0; i < minLength; ++i) {
if (string->at(i) == other.string->at(i))
continue;
return string->at(i) < other.string->at(i);
}
return string->length() < other.string->length();
}
namespace {
struct CharacterCase {
bool operator<(const CharacterCase& other) const
{
return character < other.character;
}
LChar character;
unsigned begin;
unsigned end;
};
} // anonymous namespace
void SpeculativeJIT::emitBinarySwitchStringRecurse(
SwitchData* data, const Vector<SpeculativeJIT::StringSwitchCase>& cases,
unsigned numChecked, unsigned begin, unsigned end, GPRReg buffer, GPRReg length,
GPRReg temp, unsigned alreadyCheckedLength, bool checkedExactLength)
{
static const bool verbose = false;
if (verbose) {
dataLog("We're down to the following cases, alreadyCheckedLength = ", alreadyCheckedLength, ":\n");
for (unsigned i = begin; i < end; ++i) {
dataLog(" ", cases[i].string, "\n");
}
}
if (begin == end) {
jump(data->fallThrough.block, ForceJump);
return;
}
unsigned minLength = cases[begin].string->length();
unsigned commonChars = minLength;
bool allLengthsEqual = true;
for (unsigned i = begin + 1; i < end; ++i) {
unsigned myCommonChars = numChecked;
for (unsigned j = numChecked;
j < std::min(cases[begin].string->length(), cases[i].string->length());
++j) {
if (cases[begin].string->at(j) != cases[i].string->at(j)) {
if (verbose)
dataLog("string(", cases[i].string, ")[", j, "] != string(", cases[begin].string, ")[", j, "]\n");
break;
}
myCommonChars++;
}
commonChars = std::min(commonChars, myCommonChars);
if (minLength != cases[i].string->length())
allLengthsEqual = false;
minLength = std::min(minLength, cases[i].string->length());
}
if (checkedExactLength) {
RELEASE_ASSERT(alreadyCheckedLength == minLength);
RELEASE_ASSERT(allLengthsEqual);
}
RELEASE_ASSERT(minLength >= commonChars);
if (verbose)
dataLog("length = ", minLength, ", commonChars = ", commonChars, ", allLengthsEqual = ", allLengthsEqual, "\n");
if (!allLengthsEqual && alreadyCheckedLength < minLength)
branch32(MacroAssembler::Below, length, Imm32(minLength), data->fallThrough.block);
if (allLengthsEqual && (alreadyCheckedLength < minLength || !checkedExactLength))
branch32(MacroAssembler::NotEqual, length, Imm32(minLength), data->fallThrough.block);
for (unsigned i = numChecked; i < commonChars; ++i) {
branch8(
MacroAssembler::NotEqual, MacroAssembler::Address(buffer, i),
TrustedImm32(cases[begin].string->at(i)), data->fallThrough.block);
}
if (minLength == commonChars) {
// This is the case where one of the cases is a prefix of all of the other cases.
// We've already checked that the input string is a prefix of all of the cases,
// so we just check length to jump to that case.
if (!ASSERT_DISABLED) {
ASSERT(cases[begin].string->length() == commonChars);
for (unsigned i = begin + 1; i < end; ++i)
ASSERT(cases[i].string->length() > commonChars);
}
if (allLengthsEqual) {
RELEASE_ASSERT(end == begin + 1);
jump(cases[begin].target, ForceJump);
return;
}
branch32(MacroAssembler::Equal, length, Imm32(commonChars), cases[begin].target);
// We've checked if the length is >= minLength, and then we checked if the
// length is == commonChars. We get to this point if it is >= minLength but not
// == commonChars. Hence we know that it now must be > minLength, i.e., that
// it's >= minLength + 1.
emitBinarySwitchStringRecurse(
data, cases, commonChars, begin + 1, end, buffer, length, temp, minLength + 1, false);
return;
}
// At this point we know that the string is longer than commonChars, and we've only
// verified commonChars. Use a binary switch on the next unchecked character, i.e.
// string[commonChars].
RELEASE_ASSERT(end >= begin + 2);
m_jit.load8(MacroAssembler::Address(buffer, commonChars), temp);
Vector<CharacterCase> characterCases;
CharacterCase currentCase;
currentCase.character = cases[begin].string->at(commonChars);
currentCase.begin = begin;
currentCase.end = begin + 1;
for (unsigned i = begin + 1; i < end; ++i) {
if (cases[i].string->at(commonChars) != currentCase.character) {
if (verbose)
dataLog("string(", cases[i].string, ")[", commonChars, "] != string(", cases[begin].string, ")[", commonChars, "]\n");
currentCase.end = i;
characterCases.append(currentCase);
currentCase.character = cases[i].string->at(commonChars);
currentCase.begin = i;
currentCase.end = i + 1;
} else
currentCase.end = i + 1;
}
characterCases.append(currentCase);
Vector<int64_t> characterCaseValues;
for (unsigned i = 0; i < characterCases.size(); ++i)
characterCaseValues.append(characterCases[i].character);
BinarySwitch binarySwitch(temp, characterCaseValues, BinarySwitch::Int32);
while (binarySwitch.advance(m_jit)) {
const CharacterCase& myCase = characterCases[binarySwitch.caseIndex()];
emitBinarySwitchStringRecurse(
data, cases, commonChars + 1, myCase.begin, myCase.end, buffer, length,
temp, minLength, allLengthsEqual);
}
addBranch(binarySwitch.fallThrough(), data->fallThrough.block);
}
void SpeculativeJIT::emitSwitchStringOnString(SwitchData* data, GPRReg string)
{
data->didUseJumpTable = true;
bool canDoBinarySwitch = true;
unsigned totalLength = 0;
for (unsigned i = data->cases.size(); i--;) {
StringImpl* string = data->cases[i].value.stringImpl();
if (!string->is8Bit()) {
canDoBinarySwitch = false;
break;
}
if (string->length() > Options::maximumBinaryStringSwitchCaseLength()) {
canDoBinarySwitch = false;
break;
}
totalLength += string->length();
}
if (!canDoBinarySwitch || totalLength > Options::maximumBinaryStringSwitchTotalLength()) {
flushRegisters();
callOperation(
operationSwitchString, string, data->switchTableIndex, string);
m_jit.jump(string);
return;
}
GPRTemporary length(this);
GPRTemporary temp(this);
GPRReg lengthGPR = length.gpr();
GPRReg tempGPR = temp.gpr();
m_jit.load32(MacroAssembler::Address(string, JSString::offsetOfLength()), lengthGPR);
m_jit.loadPtr(MacroAssembler::Address(string, JSString::offsetOfValue()), tempGPR);
MacroAssembler::JumpList slowCases;
slowCases.append(m_jit.branchTestPtr(MacroAssembler::Zero, tempGPR));
slowCases.append(m_jit.branchTest32(
MacroAssembler::Zero,
MacroAssembler::Address(tempGPR, StringImpl::flagsOffset()),
TrustedImm32(StringImpl::flagIs8Bit())));
m_jit.loadPtr(MacroAssembler::Address(tempGPR, StringImpl::dataOffset()), string);
Vector<StringSwitchCase> cases;
for (unsigned i = 0; i < data->cases.size(); ++i) {
cases.append(
StringSwitchCase(data->cases[i].value.stringImpl(), data->cases[i].target.block));
}
std::sort(cases.begin(), cases.end());
emitBinarySwitchStringRecurse(
data, cases, 0, 0, cases.size(), string, lengthGPR, tempGPR, 0, false);
slowCases.link(&m_jit);
silentSpillAllRegisters(string);
callOperation(operationSwitchString, string, data->switchTableIndex, string);
silentFillAllRegisters(string);
m_jit.jump(string);
}
void SpeculativeJIT::emitSwitchString(Node* node, SwitchData* data)
{
switch (node->child1().useKind()) {
case StringIdentUse: {
SpeculateCellOperand op1(this, node->child1());
GPRTemporary temp(this);
GPRReg op1GPR = op1.gpr();
GPRReg tempGPR = temp.gpr();
speculateString(node->child1(), op1GPR);
speculateStringIdentAndLoadStorage(node->child1(), op1GPR, tempGPR);
Vector<int64_t> identifierCaseValues;
for (unsigned i = 0; i < data->cases.size(); ++i) {
identifierCaseValues.append(
static_cast<int64_t>(bitwise_cast<intptr_t>(data->cases[i].value.stringImpl())));
}
BinarySwitch binarySwitch(tempGPR, identifierCaseValues, BinarySwitch::IntPtr);
while (binarySwitch.advance(m_jit))
jump(data->cases[binarySwitch.caseIndex()].target.block, ForceJump);
addBranch(binarySwitch.fallThrough(), data->fallThrough.block);
noResult(node);
break;
}
case StringUse: {
SpeculateCellOperand op1(this, node->child1());
GPRReg op1GPR = op1.gpr();
op1.use();
speculateString(node->child1(), op1GPR);
emitSwitchStringOnString(data, op1GPR);
noResult(node, UseChildrenCalledExplicitly);
break;
}
case UntypedUse: {
JSValueOperand op1(this, node->child1());
JSValueRegs op1Regs = op1.jsValueRegs();
op1.use();
addBranch(branchNotCell(op1Regs), data->fallThrough.block);
addBranch(
m_jit.branchStructurePtr(
MacroAssembler::NotEqual,
MacroAssembler::Address(op1Regs.payloadGPR(), JSCell::structureIDOffset()),
m_jit.vm()->stringStructure.get()),
data->fallThrough.block);
emitSwitchStringOnString(data, op1Regs.payloadGPR());
noResult(node, UseChildrenCalledExplicitly);
break;
}
default:
RELEASE_ASSERT_NOT_REACHED();
break;
}
}
void SpeculativeJIT::emitSwitch(Node* node)
{
SwitchData* data = node->switchData();
switch (data->kind) {
case SwitchImm: {
emitSwitchImm(node, data);
return;
}
case SwitchChar: {
emitSwitchChar(node, data);
return;
}
case SwitchString: {
emitSwitchString(node, data);
return;
} }
RELEASE_ASSERT_NOT_REACHED();
}
void SpeculativeJIT::addBranch(const MacroAssembler::JumpList& jump, BasicBlock* destination)
{
for (unsigned i = jump.jumps().size(); i--;)
addBranch(jump.jumps()[i], destination);
}
void SpeculativeJIT::linkBranches()
{
for (size_t i = 0; i < m_branches.size(); ++i) {
BranchRecord& branch = m_branches[i];
branch.jump.linkTo(m_jit.blockHeads()[branch.destination->index], &m_jit);
}
}
#if ENABLE(GGC)
void SpeculativeJIT::compileStoreBarrier(Node* node)
{
switch (node->op()) {
case StoreBarrier: {
SpeculateCellOperand base(this, node->child1());
GPRTemporary scratch1(this);
GPRTemporary scratch2(this);
writeBarrier(base.gpr(), scratch1.gpr(), scratch2.gpr());
break;
}
case StoreBarrierWithNullCheck: {
JSValueOperand base(this, node->child1());
GPRTemporary scratch1(this);
GPRTemporary scratch2(this);
#if USE(JSVALUE64)
JITCompiler::Jump isNull = m_jit.branchTest64(JITCompiler::Zero, base.gpr());
writeBarrier(base.gpr(), scratch1.gpr(), scratch2.gpr());
#else
JITCompiler::Jump isNull = m_jit.branch32(JITCompiler::Equal, base.tagGPR(), TrustedImm32(JSValue::EmptyValueTag));
writeBarrier(base.payloadGPR(), scratch1.gpr(), scratch2.gpr());
#endif
isNull.link(&m_jit);
break;
}
default:
RELEASE_ASSERT_NOT_REACHED();
break;
}
noResult(node);
}
void SpeculativeJIT::storeToWriteBarrierBuffer(GPRReg cell, GPRReg scratch1, GPRReg scratch2)
{
ASSERT(scratch1 != scratch2);
WriteBarrierBuffer* writeBarrierBuffer = &m_jit.vm()->heap.m_writeBarrierBuffer;
m_jit.move(TrustedImmPtr(writeBarrierBuffer), scratch1);
m_jit.load32(MacroAssembler::Address(scratch1, WriteBarrierBuffer::currentIndexOffset()), scratch2);
JITCompiler::Jump needToFlush = m_jit.branch32(MacroAssembler::AboveOrEqual, scratch2, MacroAssembler::Address(scratch1, WriteBarrierBuffer::capacityOffset()));
m_jit.add32(TrustedImm32(1), scratch2);
m_jit.store32(scratch2, MacroAssembler::Address(scratch1, WriteBarrierBuffer::currentIndexOffset()));
m_jit.loadPtr(MacroAssembler::Address(scratch1, WriteBarrierBuffer::bufferOffset()), scratch1);
// We use an offset of -sizeof(void*) because we already added 1 to scratch2.
m_jit.storePtr(cell, MacroAssembler::BaseIndex(scratch1, scratch2, MacroAssembler::ScalePtr, static_cast<int32_t>(-sizeof(void*))));
JITCompiler::Jump done = m_jit.jump();
needToFlush.link(&m_jit);
silentSpillAllRegisters(InvalidGPRReg);
callOperation(operationFlushWriteBarrierBuffer, cell);
silentFillAllRegisters(InvalidGPRReg);
done.link(&m_jit);
}
void SpeculativeJIT::storeToWriteBarrierBuffer(JSCell* cell, GPRReg scratch1, GPRReg scratch2)
{
ASSERT(scratch1 != scratch2);
WriteBarrierBuffer* writeBarrierBuffer = &m_jit.vm()->heap.m_writeBarrierBuffer;
m_jit.move(TrustedImmPtr(writeBarrierBuffer), scratch1);
m_jit.load32(MacroAssembler::Address(scratch1, WriteBarrierBuffer::currentIndexOffset()), scratch2);
JITCompiler::Jump needToFlush = m_jit.branch32(MacroAssembler::AboveOrEqual, scratch2, MacroAssembler::Address(scratch1, WriteBarrierBuffer::capacityOffset()));
m_jit.add32(TrustedImm32(1), scratch2);
m_jit.store32(scratch2, MacroAssembler::Address(scratch1, WriteBarrierBuffer::currentIndexOffset()));
m_jit.loadPtr(MacroAssembler::Address(scratch1, WriteBarrierBuffer::bufferOffset()), scratch1);
// We use an offset of -sizeof(void*) because we already added 1 to scratch2.
m_jit.storePtr(TrustedImmPtr(cell), MacroAssembler::BaseIndex(scratch1, scratch2, MacroAssembler::ScalePtr, static_cast<int32_t>(-sizeof(void*))));
JITCompiler::Jump done = m_jit.jump();
needToFlush.link(&m_jit);
// Call C slow path
silentSpillAllRegisters(InvalidGPRReg);
callOperation(operationFlushWriteBarrierBuffer, cell);
silentFillAllRegisters(InvalidGPRReg);
done.link(&m_jit);
}
void SpeculativeJIT::writeBarrier(GPRReg ownerGPR, JSCell* value, GPRReg scratch1, GPRReg scratch2)
{
if (Heap::isMarked(value))
return;
JITCompiler::Jump ownerIsRememberedOrInEden = m_jit.jumpIfIsRememberedOrInEden(ownerGPR);
storeToWriteBarrierBuffer(ownerGPR, scratch1, scratch2);
ownerIsRememberedOrInEden.link(&m_jit);
}
void SpeculativeJIT::writeBarrier(GPRReg ownerGPR, GPRReg scratch1, GPRReg scratch2)
{
JITCompiler::Jump ownerIsRememberedOrInEden = m_jit.jumpIfIsRememberedOrInEden(ownerGPR);
storeToWriteBarrierBuffer(ownerGPR, scratch1, scratch2);
ownerIsRememberedOrInEden.link(&m_jit);
}
#else
void SpeculativeJIT::compileStoreBarrier(Node* node)
{
DFG_NODE_DO_TO_CHILDREN(m_jit.graph(), node, speculate);
noResult(node);
}
#endif // ENABLE(GGC)
} } // namespace JSC::DFG
#endif