Source/JavaScriptCore/runtime/CommonSlowPaths.h - external/github.com/WebKit/webkit - Git at Google

 /*
  * Copyright (C) 2011-2017 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.
  */

 #pragma once

 #include "CodeBlock.h"
 #include "CodeSpecializationKind.h"
 #include "DirectArguments.h"
 #include "ExceptionHelpers.h"
 #include "FunctionCodeBlock.h"
 #include "ScopedArguments.h"
 #include "SlowPathReturnType.h"
 #include "StackAlignment.h"
 #include "VMInlines.h"
 #include <wtf/StdLibExtras.h>

 namespace JSC {

 // The purpose of this namespace is to include slow paths that are shared
 // between the interpreter and baseline JIT. They are written to be agnostic
 // with respect to the slow-path calling convention, but they do rely on the
 // JS code being executed more-or-less directly from bytecode (so the call
 // frame layout is unmodified, making it potentially awkward to use these
 // from any optimizing JIT, like the DFG).

 namespace CommonSlowPaths {

 ALWAYS_INLINE int numberOfExtraSlots(int argumentCountIncludingThis)
 {
     int frameSize = argumentCountIncludingThis + CallFrame::headerSizeInRegisters;
     int alignedFrameSize = WTF::roundUpToMultipleOf(stackAlignmentRegisters(), frameSize);
     return alignedFrameSize - frameSize;
 }

 ALWAYS_INLINE int numberOfStackPaddingSlots(CodeBlock* codeBlock, int argumentCountIncludingThis)
 {
     if (argumentCountIncludingThis >= codeBlock->numParameters())
         return 0;
     int alignedFrameSize = WTF::roundUpToMultipleOf(stackAlignmentRegisters(), argumentCountIncludingThis + CallFrame::headerSizeInRegisters);
     int alignedFrameSizeForParameters = WTF::roundUpToMultipleOf(stackAlignmentRegisters(), codeBlock->numParameters() + CallFrame::headerSizeInRegisters);
     return alignedFrameSizeForParameters - alignedFrameSize;
 }

 ALWAYS_INLINE int numberOfStackPaddingSlotsWithExtraSlots(CodeBlock* codeBlock, int argumentCountIncludingThis)
 {
     if (argumentCountIncludingThis >= codeBlock->numParameters())
         return 0;
     return numberOfStackPaddingSlots(codeBlock, argumentCountIncludingThis) + numberOfExtraSlots(argumentCountIncludingThis);
 }

 ALWAYS_INLINE int arityCheckFor(ExecState* exec, VM& vm, CodeSpecializationKind kind)
 {
     JSFunction* callee = jsCast<JSFunction*>(exec->jsCallee());
     ASSERT(!callee->isHostFunction());
     CodeBlock* newCodeBlock = callee->jsExecutable()->codeBlockFor(kind);
     ASSERT(exec->argumentCountIncludingThis() < static_cast<unsigned>(newCodeBlock->numParameters()));
     int padding = numberOfStackPaddingSlotsWithExtraSlots(newCodeBlock, exec->argumentCountIncludingThis());

     Register* newStack = exec->registers() - WTF::roundUpToMultipleOf(stackAlignmentRegisters(), padding);

     if (UNLIKELY(!vm.ensureStackCapacityFor(newStack)))
         return -1;
     return padding;
 }

 inline bool opIn(ExecState* exec, JSValue baseVal, JSValue propName, ArrayProfile* arrayProfile = nullptr)
 {
     VM& vm = exec->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);
     if (!baseVal.isObject()) {
         throwException(exec, scope, createInvalidInParameterError(exec, baseVal));
         return false;
     }

     JSObject* baseObj = asObject(baseVal);
     if (arrayProfile)
         arrayProfile->observeStructure(baseObj->structure(vm));

     uint32_t i;
     if (propName.getUInt32(i)) {
         scope.release();
         return baseObj->hasProperty(exec, i);
     }

     auto property = propName.toPropertyKey(exec);
     RETURN_IF_EXCEPTION(scope, false);
     scope.release();
     return baseObj->hasProperty(exec, property);
 }

 inline void tryCachePutToScopeGlobal(
     ExecState* exec, CodeBlock* codeBlock, Instruction* pc, JSObject* scope,
     GetPutInfo getPutInfo, PutPropertySlot& slot, const Identifier& ident)
 {
     // Covers implicit globals. Since they don't exist until they first execute, we didn't know how to cache them at compile time.
     ResolveType resolveType = getPutInfo.resolveType();
     if (resolveType != GlobalProperty && resolveType != GlobalPropertyWithVarInjectionChecks
         && resolveType != UnresolvedProperty && resolveType != UnresolvedPropertyWithVarInjectionChecks)
         return;

     if (resolveType == UnresolvedProperty || resolveType == UnresolvedPropertyWithVarInjectionChecks) {
         if (scope->isGlobalObject()) {
             ResolveType newResolveType = resolveType == UnresolvedProperty ? GlobalProperty : GlobalPropertyWithVarInjectionChecks;
             resolveType = newResolveType;
             getPutInfo = GetPutInfo(getPutInfo.resolveMode(), newResolveType, getPutInfo.initializationMode());
             ConcurrentJSLocker locker(codeBlock->m_lock);
             pc[4].u.operand = getPutInfo.operand();
         } else if (scope->isGlobalLexicalEnvironment()) {
             JSGlobalLexicalEnvironment* globalLexicalEnvironment = jsCast<JSGlobalLexicalEnvironment*>(scope);
             ResolveType newResolveType = resolveType == UnresolvedProperty ? GlobalLexicalVar : GlobalLexicalVarWithVarInjectionChecks;
             pc[4].u.operand = GetPutInfo(getPutInfo.resolveMode(), newResolveType, getPutInfo.initializationMode()).operand();
             SymbolTableEntry entry = globalLexicalEnvironment->symbolTable()->get(ident.impl());
             ASSERT(!entry.isNull());
             ConcurrentJSLocker locker(codeBlock->m_lock);
             pc[5].u.watchpointSet = entry.watchpointSet();
             pc[6].u.pointer = static_cast<void*>(globalLexicalEnvironment->variableAt(entry.scopeOffset()).slot());
         }
     }

     if (resolveType == GlobalProperty || resolveType == GlobalPropertyWithVarInjectionChecks) {
         JSGlobalObject* globalObject = codeBlock->globalObject();
         ASSERT(globalObject == scope || globalObject->varInjectionWatchpoint()->hasBeenInvalidated());
         if (!slot.isCacheablePut()
             || slot.base() != scope
             || scope != globalObject
             || !scope->structure()->propertyAccessesAreCacheable())
             return;

         if (slot.type() == PutPropertySlot::NewProperty) {
             // Don't cache if we've done a transition. We want to detect the first replace so that we
             // can invalidate the watchpoint.
             return;
         }

         VM& vm = exec->vm();
         scope->structure()->didCachePropertyReplacement(vm, slot.cachedOffset());

         ConcurrentJSLocker locker(codeBlock->m_lock);
         pc[5].u.structure.set(vm, codeBlock, scope->structure());
         pc[6].u.operand = slot.cachedOffset();
     }
 }

 inline void tryCacheGetFromScopeGlobal(
     ExecState* exec, VM& vm, Instruction* pc, JSObject* scope, PropertySlot& slot, const Identifier& ident)
 {
     GetPutInfo getPutInfo(pc[4].u.operand);
     ResolveType resolveType = getPutInfo.resolveType();

     if (resolveType == UnresolvedProperty || resolveType == UnresolvedPropertyWithVarInjectionChecks) {
         if (scope->isGlobalObject()) {
             ResolveType newResolveType = resolveType == UnresolvedProperty ? GlobalProperty : GlobalPropertyWithVarInjectionChecks;
             resolveType = newResolveType; // Allow below caching mechanism to kick in.
             ConcurrentJSLocker locker(exec->codeBlock()->m_lock);
             pc[4].u.operand = GetPutInfo(getPutInfo.resolveMode(), newResolveType, getPutInfo.initializationMode()).operand();
         } else if (scope->isGlobalLexicalEnvironment()) {
             JSGlobalLexicalEnvironment* globalLexicalEnvironment = jsCast<JSGlobalLexicalEnvironment*>(scope);
             ResolveType newResolveType = resolveType == UnresolvedProperty ? GlobalLexicalVar : GlobalLexicalVarWithVarInjectionChecks;
             SymbolTableEntry entry = globalLexicalEnvironment->symbolTable()->get(ident.impl());
             ASSERT(!entry.isNull());
             ConcurrentJSLocker locker(exec->codeBlock()->m_lock);
             pc[4].u.operand = GetPutInfo(getPutInfo.resolveMode(), newResolveType, getPutInfo.initializationMode()).operand();
             pc[5].u.watchpointSet = entry.watchpointSet();
             pc[6].u.pointer = static_cast<void*>(globalLexicalEnvironment->variableAt(entry.scopeOffset()).slot());
         }
     }

     // Covers implicit globals. Since they don't exist until they first execute, we didn't know how to cache them at compile time.
     if (resolveType == GlobalProperty || resolveType == GlobalPropertyWithVarInjectionChecks) {
         CodeBlock* codeBlock = exec->codeBlock();
         JSGlobalObject* globalObject = codeBlock->globalObject();
         ASSERT(scope == globalObject || globalObject->varInjectionWatchpoint()->hasBeenInvalidated());
         if (slot.isCacheableValue() && slot.slotBase() == scope && scope == globalObject && scope->structure()->propertyAccessesAreCacheable()) {
             Structure* structure = scope->structure(vm);
             {
                 ConcurrentJSLocker locker(codeBlock->m_lock);
                 pc[5].u.structure.set(vm, codeBlock, structure);
                 pc[6].u.operand = slot.cachedOffset();
             }
             structure->startWatchingPropertyForReplacements(vm, slot.cachedOffset());
         }
     }
 }

 inline bool canAccessArgumentIndexQuickly(JSObject& object, uint32_t index)
 {
     switch (object.structure()->typeInfo().type()) {
     case DirectArgumentsType: {
         DirectArguments* directArguments = jsCast<DirectArguments*>(&object);
         if (directArguments->isMappedArgumentInDFG(index))
             return true;
         break;
     }
     case ScopedArgumentsType: {
         ScopedArguments* scopedArguments = jsCast<ScopedArguments*>(&object);
         if (scopedArguments->isMappedArgumentInDFG(index))
             return true;
         break;
     }
     default:
         break;
     }
     return false;
 }

 } // namespace CommonSlowPaths

 class ExecState;
 struct Instruction;

 #define SLOW_PATH

 #define SLOW_PATH_DECL(name) \
 extern "C" SlowPathReturnType SLOW_PATH name(ExecState* exec, Instruction* pc)

 #define SLOW_PATH_HIDDEN_DECL(name) \
 SLOW_PATH_DECL(name) WTF_INTERNAL

 SLOW_PATH_HIDDEN_DECL(slow_path_call_arityCheck);
 SLOW_PATH_HIDDEN_DECL(slow_path_construct_arityCheck);
 SLOW_PATH_HIDDEN_DECL(slow_path_create_direct_arguments);
 SLOW_PATH_HIDDEN_DECL(slow_path_create_scoped_arguments);
 SLOW_PATH_HIDDEN_DECL(slow_path_create_cloned_arguments);
 SLOW_PATH_HIDDEN_DECL(slow_path_create_this);
 SLOW_PATH_HIDDEN_DECL(slow_path_enter);
 SLOW_PATH_HIDDEN_DECL(slow_path_get_callee);
 SLOW_PATH_HIDDEN_DECL(slow_path_to_this);
 SLOW_PATH_HIDDEN_DECL(slow_path_throw_tdz_error);
 SLOW_PATH_HIDDEN_DECL(slow_path_check_tdz);
 SLOW_PATH_HIDDEN_DECL(slow_path_throw_strict_mode_readonly_property_write_error);
 SLOW_PATH_HIDDEN_DECL(slow_path_not);
 SLOW_PATH_HIDDEN_DECL(slow_path_eq);
 SLOW_PATH_HIDDEN_DECL(slow_path_neq);
 SLOW_PATH_HIDDEN_DECL(slow_path_stricteq);
 SLOW_PATH_HIDDEN_DECL(slow_path_nstricteq);
 SLOW_PATH_HIDDEN_DECL(slow_path_less);
 SLOW_PATH_HIDDEN_DECL(slow_path_lesseq);
 SLOW_PATH_HIDDEN_DECL(slow_path_greater);
 SLOW_PATH_HIDDEN_DECL(slow_path_greatereq);
 SLOW_PATH_HIDDEN_DECL(slow_path_inc);
 SLOW_PATH_HIDDEN_DECL(slow_path_dec);
 SLOW_PATH_HIDDEN_DECL(slow_path_to_number);
 SLOW_PATH_HIDDEN_DECL(slow_path_to_string);
 SLOW_PATH_HIDDEN_DECL(slow_path_to_object);
 SLOW_PATH_HIDDEN_DECL(slow_path_negate);
 SLOW_PATH_HIDDEN_DECL(slow_path_add);
 SLOW_PATH_HIDDEN_DECL(slow_path_mul);
 SLOW_PATH_HIDDEN_DECL(slow_path_sub);
 SLOW_PATH_HIDDEN_DECL(slow_path_div);
 SLOW_PATH_HIDDEN_DECL(slow_path_mod);
 SLOW_PATH_HIDDEN_DECL(slow_path_pow);
 SLOW_PATH_HIDDEN_DECL(slow_path_lshift);
 SLOW_PATH_HIDDEN_DECL(slow_path_rshift);
 SLOW_PATH_HIDDEN_DECL(slow_path_urshift);
 SLOW_PATH_HIDDEN_DECL(slow_path_unsigned);
 SLOW_PATH_HIDDEN_DECL(slow_path_bitand);
 SLOW_PATH_HIDDEN_DECL(slow_path_bitor);
 SLOW_PATH_HIDDEN_DECL(slow_path_bitxor);
 SLOW_PATH_HIDDEN_DECL(slow_path_typeof);
 SLOW_PATH_HIDDEN_DECL(slow_path_is_object);
 SLOW_PATH_HIDDEN_DECL(slow_path_is_object_or_null);
 SLOW_PATH_HIDDEN_DECL(slow_path_is_function);
 SLOW_PATH_HIDDEN_DECL(slow_path_in);
 SLOW_PATH_HIDDEN_DECL(slow_path_del_by_val);
 SLOW_PATH_HIDDEN_DECL(slow_path_strcat);
 SLOW_PATH_HIDDEN_DECL(slow_path_to_primitive);
 SLOW_PATH_HIDDEN_DECL(slow_path_get_enumerable_length);
 SLOW_PATH_HIDDEN_DECL(slow_path_has_generic_property);
 SLOW_PATH_HIDDEN_DECL(slow_path_has_structure_property);
 SLOW_PATH_HIDDEN_DECL(slow_path_has_indexed_property);
 SLOW_PATH_HIDDEN_DECL(slow_path_get_direct_pname);
 SLOW_PATH_HIDDEN_DECL(slow_path_get_property_enumerator);
 SLOW_PATH_HIDDEN_DECL(slow_path_next_structure_enumerator_pname);
 SLOW_PATH_HIDDEN_DECL(slow_path_next_generic_enumerator_pname);
 SLOW_PATH_HIDDEN_DECL(slow_path_to_index_string);
 SLOW_PATH_HIDDEN_DECL(slow_path_profile_type_clear_log);
 SLOW_PATH_HIDDEN_DECL(slow_path_unreachable);
 SLOW_PATH_HIDDEN_DECL(slow_path_create_lexical_environment);
 SLOW_PATH_HIDDEN_DECL(slow_path_push_with_scope);
 SLOW_PATH_HIDDEN_DECL(slow_path_resolve_scope);
 SLOW_PATH_HIDDEN_DECL(slow_path_is_var_scope);
 SLOW_PATH_HIDDEN_DECL(slow_path_resolve_scope_for_hoisting_func_decl_in_eval);
 SLOW_PATH_HIDDEN_DECL(slow_path_create_rest);
 SLOW_PATH_HIDDEN_DECL(slow_path_get_by_id_with_this);
 SLOW_PATH_HIDDEN_DECL(slow_path_get_by_val_with_this);
 SLOW_PATH_HIDDEN_DECL(slow_path_put_by_id_with_this);
 SLOW_PATH_HIDDEN_DECL(slow_path_put_by_val_with_this);
 SLOW_PATH_HIDDEN_DECL(slow_path_define_data_property);
 SLOW_PATH_HIDDEN_DECL(slow_path_define_accessor_property);
 SLOW_PATH_HIDDEN_DECL(slow_path_throw_static_error);
 SLOW_PATH_HIDDEN_DECL(slow_path_new_array_with_spread);
 SLOW_PATH_HIDDEN_DECL(slow_path_new_array_buffer);
 SLOW_PATH_HIDDEN_DECL(slow_path_spread);

 using SlowPathFunction = SlowPathReturnType(SLOW_PATH *)(ExecState*, Instruction*);

 } // namespace JSC
	/*
	* Copyright (C) 2011-2017 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.
	*/

	#pragma once

	#include "CodeBlock.h"
	#include "CodeSpecializationKind.h"
	#include "DirectArguments.h"
	#include "ExceptionHelpers.h"
	#include "FunctionCodeBlock.h"
	#include "ScopedArguments.h"
	#include "SlowPathReturnType.h"
	#include "StackAlignment.h"
	#include "VMInlines.h"
	#include <wtf/StdLibExtras.h>

	namespace JSC {

	// The purpose of this namespace is to include slow paths that are shared
	// between the interpreter and baseline JIT. They are written to be agnostic
	// with respect to the slow-path calling convention, but they do rely on the
	// JS code being executed more-or-less directly from bytecode (so the call
	// frame layout is unmodified, making it potentially awkward to use these
	// from any optimizing JIT, like the DFG).

	namespace CommonSlowPaths {

	ALWAYS_INLINE int numberOfExtraSlots(int argumentCountIncludingThis)
	{
	int frameSize = argumentCountIncludingThis + CallFrame::headerSizeInRegisters;
	int alignedFrameSize = WTF::roundUpToMultipleOf(stackAlignmentRegisters(), frameSize);
	return alignedFrameSize - frameSize;
	}

	ALWAYS_INLINE int numberOfStackPaddingSlots(CodeBlock* codeBlock, int argumentCountIncludingThis)
	{
	if (argumentCountIncludingThis >= codeBlock->numParameters())
	return 0;
	int alignedFrameSize = WTF::roundUpToMultipleOf(stackAlignmentRegisters(), argumentCountIncludingThis + CallFrame::headerSizeInRegisters);
	int alignedFrameSizeForParameters = WTF::roundUpToMultipleOf(stackAlignmentRegisters(), codeBlock->numParameters() + CallFrame::headerSizeInRegisters);
	return alignedFrameSizeForParameters - alignedFrameSize;
	}

	ALWAYS_INLINE int numberOfStackPaddingSlotsWithExtraSlots(CodeBlock* codeBlock, int argumentCountIncludingThis)
	{
	if (argumentCountIncludingThis >= codeBlock->numParameters())
	return 0;
	return numberOfStackPaddingSlots(codeBlock, argumentCountIncludingThis) + numberOfExtraSlots(argumentCountIncludingThis);
	}

	ALWAYS_INLINE int arityCheckFor(ExecState* exec, VM& vm, CodeSpecializationKind kind)
	{
	JSFunction* callee = jsCast<JSFunction*>(exec->jsCallee());
	ASSERT(!callee->isHostFunction());
	CodeBlock* newCodeBlock = callee->jsExecutable()->codeBlockFor(kind);
	ASSERT(exec->argumentCountIncludingThis() < static_cast<unsigned>(newCodeBlock->numParameters()));
	int padding = numberOfStackPaddingSlotsWithExtraSlots(newCodeBlock, exec->argumentCountIncludingThis());

	Register* newStack = exec->registers() - WTF::roundUpToMultipleOf(stackAlignmentRegisters(), padding);

	if (UNLIKELY(!vm.ensureStackCapacityFor(newStack)))
	return -1;
	return padding;
	}

	inline bool opIn(ExecState* exec, JSValue baseVal, JSValue propName, ArrayProfile* arrayProfile = nullptr)
	{
	VM& vm = exec->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);
	if (!baseVal.isObject()) {
	throwException(exec, scope, createInvalidInParameterError(exec, baseVal));
	return false;
	}

	JSObject* baseObj = asObject(baseVal);
	if (arrayProfile)
	arrayProfile->observeStructure(baseObj->structure(vm));

	uint32_t i;
	if (propName.getUInt32(i)) {
	scope.release();
	return baseObj->hasProperty(exec, i);
	}

	auto property = propName.toPropertyKey(exec);
	RETURN_IF_EXCEPTION(scope, false);
	scope.release();
	return baseObj->hasProperty(exec, property);
	}

	inline void tryCachePutToScopeGlobal(
	ExecState* exec, CodeBlock* codeBlock, Instruction* pc, JSObject* scope,
	GetPutInfo getPutInfo, PutPropertySlot& slot, const Identifier& ident)
	{
	// Covers implicit globals. Since they don't exist until they first execute, we didn't know how to cache them at compile time.
	ResolveType resolveType = getPutInfo.resolveType();
	if (resolveType != GlobalProperty && resolveType != GlobalPropertyWithVarInjectionChecks
	&& resolveType != UnresolvedProperty && resolveType != UnresolvedPropertyWithVarInjectionChecks)
	return;

	if (resolveType == UnresolvedProperty \|\| resolveType == UnresolvedPropertyWithVarInjectionChecks) {
	if (scope->isGlobalObject()) {
	ResolveType newResolveType = resolveType == UnresolvedProperty ? GlobalProperty : GlobalPropertyWithVarInjectionChecks;
	resolveType = newResolveType;
	getPutInfo = GetPutInfo(getPutInfo.resolveMode(), newResolveType, getPutInfo.initializationMode());
	ConcurrentJSLocker locker(codeBlock->m_lock);
	pc[4].u.operand = getPutInfo.operand();
	} else if (scope->isGlobalLexicalEnvironment()) {
	JSGlobalLexicalEnvironment* globalLexicalEnvironment = jsCast<JSGlobalLexicalEnvironment*>(scope);
	ResolveType newResolveType = resolveType == UnresolvedProperty ? GlobalLexicalVar : GlobalLexicalVarWithVarInjectionChecks;
	pc[4].u.operand = GetPutInfo(getPutInfo.resolveMode(), newResolveType, getPutInfo.initializationMode()).operand();
	SymbolTableEntry entry = globalLexicalEnvironment->symbolTable()->get(ident.impl());
	ASSERT(!entry.isNull());
	ConcurrentJSLocker locker(codeBlock->m_lock);
	pc[5].u.watchpointSet = entry.watchpointSet();
	pc[6].u.pointer = static_cast<void*>(globalLexicalEnvironment->variableAt(entry.scopeOffset()).slot());
	}
	}

	if (resolveType == GlobalProperty \|\| resolveType == GlobalPropertyWithVarInjectionChecks) {
	JSGlobalObject* globalObject = codeBlock->globalObject();
	ASSERT(globalObject == scope \|\| globalObject->varInjectionWatchpoint()->hasBeenInvalidated());
	if (!slot.isCacheablePut()
	\|\| slot.base() != scope
	\|\| scope != globalObject
	\|\| !scope->structure()->propertyAccessesAreCacheable())
	return;

	if (slot.type() == PutPropertySlot::NewProperty) {
	// Don't cache if we've done a transition. We want to detect the first replace so that we
	// can invalidate the watchpoint.
	return;
	}

	VM& vm = exec->vm();
	scope->structure()->didCachePropertyReplacement(vm, slot.cachedOffset());

	ConcurrentJSLocker locker(codeBlock->m_lock);
	pc[5].u.structure.set(vm, codeBlock, scope->structure());
	pc[6].u.operand = slot.cachedOffset();
	}
	}

	inline void tryCacheGetFromScopeGlobal(
	ExecState* exec, VM& vm, Instruction* pc, JSObject* scope, PropertySlot& slot, const Identifier& ident)
	{
	GetPutInfo getPutInfo(pc[4].u.operand);
	ResolveType resolveType = getPutInfo.resolveType();

	if (resolveType == UnresolvedProperty \|\| resolveType == UnresolvedPropertyWithVarInjectionChecks) {
	if (scope->isGlobalObject()) {
	ResolveType newResolveType = resolveType == UnresolvedProperty ? GlobalProperty : GlobalPropertyWithVarInjectionChecks;
	resolveType = newResolveType; // Allow below caching mechanism to kick in.
	ConcurrentJSLocker locker(exec->codeBlock()->m_lock);
	pc[4].u.operand = GetPutInfo(getPutInfo.resolveMode(), newResolveType, getPutInfo.initializationMode()).operand();
	} else if (scope->isGlobalLexicalEnvironment()) {
	JSGlobalLexicalEnvironment* globalLexicalEnvironment = jsCast<JSGlobalLexicalEnvironment*>(scope);
	ResolveType newResolveType = resolveType == UnresolvedProperty ? GlobalLexicalVar : GlobalLexicalVarWithVarInjectionChecks;
	SymbolTableEntry entry = globalLexicalEnvironment->symbolTable()->get(ident.impl());
	ASSERT(!entry.isNull());
	ConcurrentJSLocker locker(exec->codeBlock()->m_lock);
	pc[4].u.operand = GetPutInfo(getPutInfo.resolveMode(), newResolveType, getPutInfo.initializationMode()).operand();
	pc[5].u.watchpointSet = entry.watchpointSet();
	pc[6].u.pointer = static_cast<void*>(globalLexicalEnvironment->variableAt(entry.scopeOffset()).slot());
	}
	}

	// Covers implicit globals. Since they don't exist until they first execute, we didn't know how to cache them at compile time.
	if (resolveType == GlobalProperty \|\| resolveType == GlobalPropertyWithVarInjectionChecks) {
	CodeBlock* codeBlock = exec->codeBlock();
	JSGlobalObject* globalObject = codeBlock->globalObject();
	ASSERT(scope == globalObject \|\| globalObject->varInjectionWatchpoint()->hasBeenInvalidated());
	if (slot.isCacheableValue() && slot.slotBase() == scope && scope == globalObject && scope->structure()->propertyAccessesAreCacheable()) {
	Structure* structure = scope->structure(vm);
	{
	ConcurrentJSLocker locker(codeBlock->m_lock);
	pc[5].u.structure.set(vm, codeBlock, structure);
	pc[6].u.operand = slot.cachedOffset();
	}
	structure->startWatchingPropertyForReplacements(vm, slot.cachedOffset());
	}
	}
	}

	inline bool canAccessArgumentIndexQuickly(JSObject& object, uint32_t index)
	{
	switch (object.structure()->typeInfo().type()) {
	case DirectArgumentsType: {
	DirectArguments* directArguments = jsCast<DirectArguments*>(&object);
	if (directArguments->isMappedArgumentInDFG(index))
	return true;
	break;
	}
	case ScopedArgumentsType: {
	ScopedArguments* scopedArguments = jsCast<ScopedArguments*>(&object);
	if (scopedArguments->isMappedArgumentInDFG(index))
	return true;
	break;
	}
	default:
	break;
	}
	return false;
	}

	} // namespace CommonSlowPaths

	class ExecState;
	struct Instruction;

	#define SLOW_PATH

	#define SLOW_PATH_DECL(name) \
	extern "C" SlowPathReturnType SLOW_PATH name(ExecState* exec, Instruction* pc)

	#define SLOW_PATH_HIDDEN_DECL(name) \
	SLOW_PATH_DECL(name) WTF_INTERNAL

	SLOW_PATH_HIDDEN_DECL(slow_path_call_arityCheck);
	SLOW_PATH_HIDDEN_DECL(slow_path_construct_arityCheck);
	SLOW_PATH_HIDDEN_DECL(slow_path_create_direct_arguments);
	SLOW_PATH_HIDDEN_DECL(slow_path_create_scoped_arguments);
	SLOW_PATH_HIDDEN_DECL(slow_path_create_cloned_arguments);
	SLOW_PATH_HIDDEN_DECL(slow_path_create_this);
	SLOW_PATH_HIDDEN_DECL(slow_path_enter);
	SLOW_PATH_HIDDEN_DECL(slow_path_get_callee);
	SLOW_PATH_HIDDEN_DECL(slow_path_to_this);
	SLOW_PATH_HIDDEN_DECL(slow_path_throw_tdz_error);
	SLOW_PATH_HIDDEN_DECL(slow_path_check_tdz);
	SLOW_PATH_HIDDEN_DECL(slow_path_throw_strict_mode_readonly_property_write_error);
	SLOW_PATH_HIDDEN_DECL(slow_path_not);
	SLOW_PATH_HIDDEN_DECL(slow_path_eq);
	SLOW_PATH_HIDDEN_DECL(slow_path_neq);
	SLOW_PATH_HIDDEN_DECL(slow_path_stricteq);
	SLOW_PATH_HIDDEN_DECL(slow_path_nstricteq);
	SLOW_PATH_HIDDEN_DECL(slow_path_less);
	SLOW_PATH_HIDDEN_DECL(slow_path_lesseq);
	SLOW_PATH_HIDDEN_DECL(slow_path_greater);
	SLOW_PATH_HIDDEN_DECL(slow_path_greatereq);
	SLOW_PATH_HIDDEN_DECL(slow_path_inc);
	SLOW_PATH_HIDDEN_DECL(slow_path_dec);
	SLOW_PATH_HIDDEN_DECL(slow_path_to_number);
	SLOW_PATH_HIDDEN_DECL(slow_path_to_string);
	SLOW_PATH_HIDDEN_DECL(slow_path_to_object);
	SLOW_PATH_HIDDEN_DECL(slow_path_negate);
	SLOW_PATH_HIDDEN_DECL(slow_path_add);
	SLOW_PATH_HIDDEN_DECL(slow_path_mul);
	SLOW_PATH_HIDDEN_DECL(slow_path_sub);
	SLOW_PATH_HIDDEN_DECL(slow_path_div);
	SLOW_PATH_HIDDEN_DECL(slow_path_mod);
	SLOW_PATH_HIDDEN_DECL(slow_path_pow);
	SLOW_PATH_HIDDEN_DECL(slow_path_lshift);
	SLOW_PATH_HIDDEN_DECL(slow_path_rshift);
	SLOW_PATH_HIDDEN_DECL(slow_path_urshift);
	SLOW_PATH_HIDDEN_DECL(slow_path_unsigned);
	SLOW_PATH_HIDDEN_DECL(slow_path_bitand);
	SLOW_PATH_HIDDEN_DECL(slow_path_bitor);
	SLOW_PATH_HIDDEN_DECL(slow_path_bitxor);
	SLOW_PATH_HIDDEN_DECL(slow_path_typeof);
	SLOW_PATH_HIDDEN_DECL(slow_path_is_object);
	SLOW_PATH_HIDDEN_DECL(slow_path_is_object_or_null);
	SLOW_PATH_HIDDEN_DECL(slow_path_is_function);
	SLOW_PATH_HIDDEN_DECL(slow_path_in);
	SLOW_PATH_HIDDEN_DECL(slow_path_del_by_val);
	SLOW_PATH_HIDDEN_DECL(slow_path_strcat);
	SLOW_PATH_HIDDEN_DECL(slow_path_to_primitive);
	SLOW_PATH_HIDDEN_DECL(slow_path_get_enumerable_length);
	SLOW_PATH_HIDDEN_DECL(slow_path_has_generic_property);
	SLOW_PATH_HIDDEN_DECL(slow_path_has_structure_property);
	SLOW_PATH_HIDDEN_DECL(slow_path_has_indexed_property);
	SLOW_PATH_HIDDEN_DECL(slow_path_get_direct_pname);
	SLOW_PATH_HIDDEN_DECL(slow_path_get_property_enumerator);
	SLOW_PATH_HIDDEN_DECL(slow_path_next_structure_enumerator_pname);
	SLOW_PATH_HIDDEN_DECL(slow_path_next_generic_enumerator_pname);
	SLOW_PATH_HIDDEN_DECL(slow_path_to_index_string);
	SLOW_PATH_HIDDEN_DECL(slow_path_profile_type_clear_log);
	SLOW_PATH_HIDDEN_DECL(slow_path_unreachable);
	SLOW_PATH_HIDDEN_DECL(slow_path_create_lexical_environment);
	SLOW_PATH_HIDDEN_DECL(slow_path_push_with_scope);
	SLOW_PATH_HIDDEN_DECL(slow_path_resolve_scope);
	SLOW_PATH_HIDDEN_DECL(slow_path_is_var_scope);
	SLOW_PATH_HIDDEN_DECL(slow_path_resolve_scope_for_hoisting_func_decl_in_eval);
	SLOW_PATH_HIDDEN_DECL(slow_path_create_rest);
	SLOW_PATH_HIDDEN_DECL(slow_path_get_by_id_with_this);
	SLOW_PATH_HIDDEN_DECL(slow_path_get_by_val_with_this);
	SLOW_PATH_HIDDEN_DECL(slow_path_put_by_id_with_this);
	SLOW_PATH_HIDDEN_DECL(slow_path_put_by_val_with_this);
	SLOW_PATH_HIDDEN_DECL(slow_path_define_data_property);
	SLOW_PATH_HIDDEN_DECL(slow_path_define_accessor_property);
	SLOW_PATH_HIDDEN_DECL(slow_path_throw_static_error);
	SLOW_PATH_HIDDEN_DECL(slow_path_new_array_with_spread);
	SLOW_PATH_HIDDEN_DECL(slow_path_new_array_buffer);
	SLOW_PATH_HIDDEN_DECL(slow_path_spread);

	using SlowPathFunction = SlowPathReturnType(SLOW_PATH )(ExecState, Instruction*);

	} // namespace JSC