Source/JavaScriptCore/ftl/FTLOperations.cpp - external/github.com/WebKit/webkit - Git at Google

 /*
  * Copyright (C) 2014, 2015 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 "FTLOperations.h"

 #if ENABLE(FTL_JIT)

 #include "ClonedArguments.h"
 #include "DirectArguments.h"
 #include "JSCInlines.h"
 #include "JSLexicalEnvironment.h"

 namespace JSC { namespace FTL {

 using namespace JSC::DFG;

 extern "C" JSCell* JIT_OPERATION operationNewObjectWithButterfly(ExecState* exec, Structure* structure)
 {
     VM& vm = exec->vm();
     NativeCallFrameTracer tracer(&vm, exec);

     Butterfly* butterfly = Butterfly::create(
         vm, nullptr, 0, structure->outOfLineCapacity(), false, IndexingHeader(), 0);

     return JSFinalObject::create(exec, structure, butterfly);
 }

 extern "C" JSCell* JIT_OPERATION operationMaterializeObjectInOSR(
     ExecState* exec, ExitTimeObjectMaterialization* materialization, EncodedJSValue* values)
 {
     VM& vm = exec->vm();
     CodeBlock* codeBlock = exec->codeBlock();

     // We cannot GC. We've got pointers in evil places.
     DeferGCForAWhile deferGC(vm.heap);

     switch (materialization->type()) {
     case PhantomNewObject: {
         // First figure out what the structure is.
         Structure* structure = nullptr;
         for (unsigned i = materialization->properties().size(); i--;) {
             const ExitPropertyValue& property = materialization->properties()[i];
             if (property.location() != PromotedLocationDescriptor(StructurePLoc))
                 continue;

             structure = jsCast<Structure*>(JSValue::decode(values[i]));
             break;
         }
         RELEASE_ASSERT(structure);

         // Let's create that object!
         JSFinalObject* result = JSFinalObject::create(vm, structure);

         // Now figure out what the heck to populate the object with. Use getPropertiesConcurrently()
         // because that happens to be lower-level and more convenient. It doesn't change the
         // materialization of the property table. We want to have minimal visible effects on the
         // system. Also, don't mind that this is O(n^2). It doesn't matter. We only get here from OSR
         // exit.
         for (PropertyMapEntry entry : structure->getPropertiesConcurrently()) {
             for (unsigned i = materialization->properties().size(); i--;) {
                 const ExitPropertyValue& property = materialization->properties()[i];
                 if (property.location().kind() != NamedPropertyPLoc)
                     continue;
                 if (codeBlock->identifier(property.location().info()).impl() != entry.key)
                     continue;

                 result->putDirect(vm, entry.offset, JSValue::decode(values[i]));
             }
         }

         return result;
     }

     case PhantomNewFunction: {
         // Figure out what the executable and activation are
         FunctionExecutable* executable = nullptr;
         JSScope* activation = nullptr;
         for (unsigned i = materialization->properties().size(); i--;) {
             const ExitPropertyValue& property = materialization->properties()[i];
             if (property.location() == PromotedLocationDescriptor(FunctionExecutablePLoc))
                 executable = jsCast<FunctionExecutable*>(JSValue::decode(values[i]));
             if (property.location() == PromotedLocationDescriptor(FunctionActivationPLoc))
                 activation = jsCast<JSScope*>(JSValue::decode(values[i]));
         }
         RELEASE_ASSERT(executable && activation);

         JSFunction* result = JSFunction::createWithInvalidatedReallocationWatchpoint(vm, executable, activation);

         return result;
     }

     case PhantomCreateActivation: {
         // Figure out where the scope is
         JSScope* scope = nullptr;
         SymbolTable* table = nullptr;
         for (unsigned i = materialization->properties().size(); i--;) {
             const ExitPropertyValue& property = materialization->properties()[i];
             if (property.location() == PromotedLocationDescriptor(ActivationScopePLoc))
                 scope = jsCast<JSScope*>(JSValue::decode(values[i]));
             else if (property.location() == PromotedLocationDescriptor(ActivationSymbolTablePLoc))
                 table = jsCast<SymbolTable*>(JSValue::decode(values[i]));
         }
         RELEASE_ASSERT(scope);
         RELEASE_ASSERT(table);

         CodeBlock* codeBlock = baselineCodeBlockForOriginAndBaselineCodeBlock(
             materialization->origin(), exec->codeBlock());
         Structure* structure = codeBlock->globalObject()->activationStructure();

         JSLexicalEnvironment* result = JSLexicalEnvironment::create(vm, structure, scope, table);

         RELEASE_ASSERT(materialization->properties().size() - 2 == table->scopeSize());
         // Figure out what to populate the activation with
         for (unsigned i = materialization->properties().size(); i--;) {
             const ExitPropertyValue& property = materialization->properties()[i];
             if (property.location().kind() != ClosureVarPLoc)
                 continue;

             result->variableAt(ScopeOffset(property.location().info())).set(exec->vm(), result, JSValue::decode(values[i]));
         }

         if (validationEnabled()) {
             // Validate to make sure every slot in the scope has one value.
             ConcurrentJITLocker locker(table->m_lock);
             for (auto iter = table->begin(locker), end = table->end(locker); iter != end; ++iter) {
                 bool found = false;
                 for (unsigned i = materialization->properties().size(); i--;) {
                     const ExitPropertyValue& property = materialization->properties()[i];
                     if (property.location().kind() != ClosureVarPLoc)
                         continue;
                     if (ScopeOffset(property.location().info()) == iter->value.scopeOffset()) {
                         found = true;
                         break;
                     }
                 }
                 ASSERT_UNUSED(found, found);
             }
             unsigned numberOfClosureVarPloc = 0;
             for (unsigned i = materialization->properties().size(); i--;) {
                 const ExitPropertyValue& property = materialization->properties()[i];
                 if (property.location().kind() == ClosureVarPLoc)
                     numberOfClosureVarPloc++;
             }
             ASSERT(numberOfClosureVarPloc == table->scopeSize());
         }

         return result;
     }

     case PhantomDirectArguments:
     case PhantomClonedArguments: {
         if (!materialization->origin().inlineCallFrame) {
             switch (materialization->type()) {
             case PhantomDirectArguments:
                 return DirectArguments::createByCopying(exec);
             case PhantomClonedArguments:
                 return ClonedArguments::createWithMachineFrame(exec, exec, ArgumentsMode::Cloned);
             default:
                 RELEASE_ASSERT_NOT_REACHED();
                 return nullptr;
             }
         }

         // First figure out the argument count. If there isn't one then we represent the machine frame.
         unsigned argumentCount = 0;
         if (materialization->origin().inlineCallFrame->isVarargs()) {
             for (unsigned i = materialization->properties().size(); i--;) {
                 const ExitPropertyValue& property = materialization->properties()[i];
                 if (property.location() != PromotedLocationDescriptor(ArgumentCountPLoc))
                     continue;

                 argumentCount = JSValue::decode(values[i]).asUInt32();
                 RELEASE_ASSERT(argumentCount);
                 break;
             }
             RELEASE_ASSERT(argumentCount);
         } else
             argumentCount = materialization->origin().inlineCallFrame->arguments.size();

         JSFunction* callee = nullptr;
         if (materialization->origin().inlineCallFrame->isClosureCall) {
             for (unsigned i = materialization->properties().size(); i--;) {
                 const ExitPropertyValue& property = materialization->properties()[i];
                 if (property.location() != PromotedLocationDescriptor(ArgumentsCalleePLoc))
                     continue;

                 callee = jsCast<JSFunction*>(JSValue::decode(values[i]));
                 break;
             }
         } else
             callee = materialization->origin().inlineCallFrame->calleeConstant();
         RELEASE_ASSERT(callee);

         CodeBlock* codeBlock = baselineCodeBlockForOriginAndBaselineCodeBlock(
             materialization->origin(), exec->codeBlock());

         // We have an inline frame and we have all of the data we need to recreate it.
         switch (materialization->type()) {
         case PhantomDirectArguments: {
             unsigned length = argumentCount - 1;
             unsigned capacity = std::max(length, static_cast<unsigned>(codeBlock->numParameters() - 1));
             DirectArguments* result = DirectArguments::create(
                 vm, codeBlock->globalObject()->directArgumentsStructure(), length, capacity);
             result->callee().set(vm, result, callee);
             for (unsigned i = materialization->properties().size(); i--;) {
                 const ExitPropertyValue& property = materialization->properties()[i];
                 if (property.location().kind() != ArgumentPLoc)
                     continue;

                 unsigned index = property.location().info();
                 if (index >= capacity)
                     continue;

                 // We don't want to use setIndexQuickly(), since that's only for the passed-in
                 // arguments but sometimes the number of named arguments is greater. For
                 // example:
                 //
                 // function foo(a, b, c) { ... }
                 // foo();
                 //
                 // setIndexQuickly() would fail for indices 0, 1, 2 - but we need to recover
                 // those here.
                 result->argument(DirectArgumentsOffset(index)).set(
                     vm, result, JSValue::decode(values[i]));
             }
             return result;
         }
         case PhantomClonedArguments: {
             unsigned length = argumentCount - 1;
             ClonedArguments* result = ClonedArguments::createEmpty(
                 vm, codeBlock->globalObject()->outOfBandArgumentsStructure(), callee);

             for (unsigned i = materialization->properties().size(); i--;) {
                 const ExitPropertyValue& property = materialization->properties()[i];
                 if (property.location().kind() != ArgumentPLoc)
                     continue;

                 unsigned index = property.location().info();
                 if (index >= length)
                     continue;
                 result->putDirectIndex(exec, index, JSValue::decode(values[i]));
             }

             result->putDirect(vm, vm.propertyNames->length, jsNumber(length));
             return result;
         }
         default:
             RELEASE_ASSERT_NOT_REACHED();
             return nullptr;
         }
     }

     default:
         RELEASE_ASSERT_NOT_REACHED();
         return nullptr;
     }
 }

 } } // namespace JSC::FTL

 #endif // ENABLE(FTL_JIT)
	/*
	* Copyright (C) 2014, 2015 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 "FTLOperations.h"

	#if ENABLE(FTL_JIT)

	#include "ClonedArguments.h"
	#include "DirectArguments.h"
	#include "JSCInlines.h"
	#include "JSLexicalEnvironment.h"

	namespace JSC { namespace FTL {

	using namespace JSC::DFG;

	extern "C" JSCell* JIT_OPERATION operationNewObjectWithButterfly(ExecState* exec, Structure* structure)
	{
	VM& vm = exec->vm();
	NativeCallFrameTracer tracer(&vm, exec);

	Butterfly* butterfly = Butterfly::create(
	vm, nullptr, 0, structure->outOfLineCapacity(), false, IndexingHeader(), 0);

	return JSFinalObject::create(exec, structure, butterfly);
	}

	extern "C" JSCell* JIT_OPERATION operationMaterializeObjectInOSR(
	ExecState* exec, ExitTimeObjectMaterialization* materialization, EncodedJSValue* values)
	{
	VM& vm = exec->vm();
	CodeBlock* codeBlock = exec->codeBlock();

	// We cannot GC. We've got pointers in evil places.
	DeferGCForAWhile deferGC(vm.heap);

	switch (materialization->type()) {
	case PhantomNewObject: {
	// First figure out what the structure is.
	Structure* structure = nullptr;
	for (unsigned i = materialization->properties().size(); i--;) {
	const ExitPropertyValue& property = materialization->properties()[i];
	if (property.location() != PromotedLocationDescriptor(StructurePLoc))
	continue;

	structure = jsCast<Structure*>(JSValue::decode(values[i]));
	break;
	}
	RELEASE_ASSERT(structure);

	// Let's create that object!
	JSFinalObject* result = JSFinalObject::create(vm, structure);

	// Now figure out what the heck to populate the object with. Use getPropertiesConcurrently()
	// because that happens to be lower-level and more convenient. It doesn't change the
	// materialization of the property table. We want to have minimal visible effects on the
	// system. Also, don't mind that this is O(n^2). It doesn't matter. We only get here from OSR
	// exit.
	for (PropertyMapEntry entry : structure->getPropertiesConcurrently()) {
	for (unsigned i = materialization->properties().size(); i--;) {
	const ExitPropertyValue& property = materialization->properties()[i];
	if (property.location().kind() != NamedPropertyPLoc)
	continue;
	if (codeBlock->identifier(property.location().info()).impl() != entry.key)
	continue;

	result->putDirect(vm, entry.offset, JSValue::decode(values[i]));
	}
	}

	return result;
	}

	case PhantomNewFunction: {
	// Figure out what the executable and activation are
	FunctionExecutable* executable = nullptr;
	JSScope* activation = nullptr;
	for (unsigned i = materialization->properties().size(); i--;) {
	const ExitPropertyValue& property = materialization->properties()[i];
	if (property.location() == PromotedLocationDescriptor(FunctionExecutablePLoc))
	executable = jsCast<FunctionExecutable*>(JSValue::decode(values[i]));
	if (property.location() == PromotedLocationDescriptor(FunctionActivationPLoc))
	activation = jsCast<JSScope*>(JSValue::decode(values[i]));
	}
	RELEASE_ASSERT(executable && activation);

	JSFunction* result = JSFunction::createWithInvalidatedReallocationWatchpoint(vm, executable, activation);

	return result;
	}

	case PhantomCreateActivation: {
	// Figure out where the scope is
	JSScope* scope = nullptr;
	SymbolTable* table = nullptr;
	for (unsigned i = materialization->properties().size(); i--;) {
	const ExitPropertyValue& property = materialization->properties()[i];
	if (property.location() == PromotedLocationDescriptor(ActivationScopePLoc))
	scope = jsCast<JSScope*>(JSValue::decode(values[i]));
	else if (property.location() == PromotedLocationDescriptor(ActivationSymbolTablePLoc))
	table = jsCast<SymbolTable*>(JSValue::decode(values[i]));
	}
	RELEASE_ASSERT(scope);
	RELEASE_ASSERT(table);

	CodeBlock* codeBlock = baselineCodeBlockForOriginAndBaselineCodeBlock(
	materialization->origin(), exec->codeBlock());
	Structure* structure = codeBlock->globalObject()->activationStructure();

	JSLexicalEnvironment* result = JSLexicalEnvironment::create(vm, structure, scope, table);

	RELEASE_ASSERT(materialization->properties().size() - 2 == table->scopeSize());
	// Figure out what to populate the activation with
	for (unsigned i = materialization->properties().size(); i--;) {
	const ExitPropertyValue& property = materialization->properties()[i];
	if (property.location().kind() != ClosureVarPLoc)
	continue;

	result->variableAt(ScopeOffset(property.location().info())).set(exec->vm(), result, JSValue::decode(values[i]));
	}

	if (validationEnabled()) {
	// Validate to make sure every slot in the scope has one value.
	ConcurrentJITLocker locker(table->m_lock);
	for (auto iter = table->begin(locker), end = table->end(locker); iter != end; ++iter) {
	bool found = false;
	for (unsigned i = materialization->properties().size(); i--;) {
	const ExitPropertyValue& property = materialization->properties()[i];
	if (property.location().kind() != ClosureVarPLoc)
	continue;
	if (ScopeOffset(property.location().info()) == iter->value.scopeOffset()) {
	found = true;
	break;
	}
	}
	ASSERT_UNUSED(found, found);
	}
	unsigned numberOfClosureVarPloc = 0;
	for (unsigned i = materialization->properties().size(); i--;) {
	const ExitPropertyValue& property = materialization->properties()[i];
	if (property.location().kind() == ClosureVarPLoc)
	numberOfClosureVarPloc++;
	}
	ASSERT(numberOfClosureVarPloc == table->scopeSize());
	}

	return result;
	}

	case PhantomDirectArguments:
	case PhantomClonedArguments: {
	if (!materialization->origin().inlineCallFrame) {
	switch (materialization->type()) {
	case PhantomDirectArguments:
	return DirectArguments::createByCopying(exec);
	case PhantomClonedArguments:
	return ClonedArguments::createWithMachineFrame(exec, exec, ArgumentsMode::Cloned);
	default:
	RELEASE_ASSERT_NOT_REACHED();
	return nullptr;
	}
	}

	// First figure out the argument count. If there isn't one then we represent the machine frame.
	unsigned argumentCount = 0;
	if (materialization->origin().inlineCallFrame->isVarargs()) {
	for (unsigned i = materialization->properties().size(); i--;) {
	const ExitPropertyValue& property = materialization->properties()[i];
	if (property.location() != PromotedLocationDescriptor(ArgumentCountPLoc))
	continue;

	argumentCount = JSValue::decode(values[i]).asUInt32();
	RELEASE_ASSERT(argumentCount);
	break;
	}
	RELEASE_ASSERT(argumentCount);
	} else
	argumentCount = materialization->origin().inlineCallFrame->arguments.size();

	JSFunction* callee = nullptr;
	if (materialization->origin().inlineCallFrame->isClosureCall) {
	for (unsigned i = materialization->properties().size(); i--;) {
	const ExitPropertyValue& property = materialization->properties()[i];
	if (property.location() != PromotedLocationDescriptor(ArgumentsCalleePLoc))
	continue;

	callee = jsCast<JSFunction*>(JSValue::decode(values[i]));
	break;
	}
	} else
	callee = materialization->origin().inlineCallFrame->calleeConstant();
	RELEASE_ASSERT(callee);

	CodeBlock* codeBlock = baselineCodeBlockForOriginAndBaselineCodeBlock(
	materialization->origin(), exec->codeBlock());

	// We have an inline frame and we have all of the data we need to recreate it.
	switch (materialization->type()) {
	case PhantomDirectArguments: {
	unsigned length = argumentCount - 1;
	unsigned capacity = std::max(length, static_cast<unsigned>(codeBlock->numParameters() - 1));
	DirectArguments* result = DirectArguments::create(
	vm, codeBlock->globalObject()->directArgumentsStructure(), length, capacity);
	result->callee().set(vm, result, callee);
	for (unsigned i = materialization->properties().size(); i--;) {
	const ExitPropertyValue& property = materialization->properties()[i];
	if (property.location().kind() != ArgumentPLoc)
	continue;

	unsigned index = property.location().info();
	if (index >= capacity)
	continue;

	// We don't want to use setIndexQuickly(), since that's only for the passed-in
	// arguments but sometimes the number of named arguments is greater. For
	// example:
	//
	// function foo(a, b, c) { ... }
	// foo();
	//
	// setIndexQuickly() would fail for indices 0, 1, 2 - but we need to recover
	// those here.
	result->argument(DirectArgumentsOffset(index)).set(
	vm, result, JSValue::decode(values[i]));
	}
	return result;
	}
	case PhantomClonedArguments: {
	unsigned length = argumentCount - 1;
	ClonedArguments* result = ClonedArguments::createEmpty(
	vm, codeBlock->globalObject()->outOfBandArgumentsStructure(), callee);

	for (unsigned i = materialization->properties().size(); i--;) {
	const ExitPropertyValue& property = materialization->properties()[i];
	if (property.location().kind() != ArgumentPLoc)
	continue;

	unsigned index = property.location().info();
	if (index >= length)
	continue;
	result->putDirectIndex(exec, index, JSValue::decode(values[i]));
	}

	result->putDirect(vm, vm.propertyNames->length, jsNumber(length));
	return result;
	}
	default:
	RELEASE_ASSERT_NOT_REACHED();
	return nullptr;
	}
	}

	default:
	RELEASE_ASSERT_NOT_REACHED();
	return nullptr;
	}
	}

	} } // namespace JSC::FTL

	#endif // ENABLE(FTL_JIT)