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/*
* Copyright (C) 2009-2018 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 "ExecutableToCodeBlockEdge.h"
#include "ScriptExecutable.h"
#include "SourceCode.h"
#include <wtf/Box.h>
#include <wtf/Markable.h>
namespace JSC {
struct FunctionOverrideInfo;
class FunctionExecutable final : public ScriptExecutable {
friend class JIT;
friend class LLIntOffsetsExtractor;
public:
typedef ScriptExecutable Base;
static const unsigned StructureFlags = Base::StructureFlags | StructureIsImmortal;
template<typename CellType, SubspaceAccess>
static IsoSubspace* subspaceFor(VM& vm)
{
return &vm.functionExecutableSpace.space;
}
static FunctionExecutable* create(VM& vm, ScriptExecutable* topLevelExecutable, const SourceCode& source, UnlinkedFunctionExecutable* unlinkedExecutable, Intrinsic intrinsic)
{
FunctionExecutable* executable = new (NotNull, allocateCell<FunctionExecutable>(vm.heap)) FunctionExecutable(vm, source, unlinkedExecutable, intrinsic);
executable->finishCreation(vm, topLevelExecutable);
return executable;
}
static FunctionExecutable* fromGlobalCode(
const Identifier& name, ExecState&, const SourceCode&,
JSObject*& exception, int overrideLineNumber, Optional<int> functionConstructorParametersEndPosition);
static void destroy(JSCell*);
UnlinkedFunctionExecutable* unlinkedExecutable() const
{
return m_unlinkedExecutable.get();
}
// Returns either call or construct bytecode. This can be appropriate
// for answering questions that that don't vary between call and construct --
// for example, argumentsRegister().
FunctionCodeBlock* eitherCodeBlock()
{
ExecutableToCodeBlockEdge* edge;
if (m_codeBlockForCall)
edge = m_codeBlockForCall.get();
else
edge = m_codeBlockForConstruct.get();
return bitwise_cast<FunctionCodeBlock*>(ExecutableToCodeBlockEdge::unwrap(edge));
}
bool isGeneratedForCall() const
{
return !!m_codeBlockForCall;
}
FunctionCodeBlock* codeBlockForCall()
{
return bitwise_cast<FunctionCodeBlock*>(ExecutableToCodeBlockEdge::unwrap(m_codeBlockForCall.get()));
}
bool isGeneratedForConstruct() const
{
return !!m_codeBlockForConstruct;
}
FunctionCodeBlock* codeBlockForConstruct()
{
return bitwise_cast<FunctionCodeBlock*>(ExecutableToCodeBlockEdge::unwrap(m_codeBlockForConstruct.get()));
}
bool isGeneratedFor(CodeSpecializationKind kind)
{
if (kind == CodeForCall)
return isGeneratedForCall();
ASSERT(kind == CodeForConstruct);
return isGeneratedForConstruct();
}
FunctionCodeBlock* codeBlockFor(CodeSpecializationKind kind)
{
if (kind == CodeForCall)
return codeBlockForCall();
ASSERT(kind == CodeForConstruct);
return codeBlockForConstruct();
}
FunctionCodeBlock* baselineCodeBlockFor(CodeSpecializationKind);
FunctionCodeBlock* profiledCodeBlockFor(CodeSpecializationKind kind)
{
return baselineCodeBlockFor(kind);
}
RefPtr<TypeSet> returnStatementTypeSet()
{
RareData& rareData = ensureRareData();
if (!rareData.m_returnStatementTypeSet)
rareData.m_returnStatementTypeSet = TypeSet::create();
return rareData.m_returnStatementTypeSet;
}
FunctionMode functionMode() { return m_unlinkedExecutable->functionMode(); }
bool isBuiltinFunction() const { return m_unlinkedExecutable->isBuiltinFunction(); }
ConstructAbility constructAbility() const { return m_unlinkedExecutable->constructAbility(); }
bool isClass() const { return m_unlinkedExecutable->isClass(); }
bool isArrowFunction() const { return parseMode() == SourceParseMode::ArrowFunctionMode; }
bool isGetter() const { return parseMode() == SourceParseMode::GetterMode; }
bool isSetter() const { return parseMode() == SourceParseMode::SetterMode; }
bool isGenerator() const { return isGeneratorParseMode(parseMode()); }
bool isAsyncGenerator() const { return isAsyncGeneratorParseMode(parseMode()); }
bool isMethod() const { return parseMode() == SourceParseMode::MethodMode; }
bool hasCallerAndArgumentsProperties() const
{
// Per https://tc39.github.io/ecma262/#sec-forbidden-extensions, only sloppy-mode non-builtin functions in old-style (pre-ES6) syntactic forms can contain
// "caller" and "arguments".
return !isStrictMode() && parseMode() == SourceParseMode::NormalFunctionMode && !isClassConstructorFunction();
}
bool hasPrototypeProperty() const
{
return SourceParseModeSet(
SourceParseMode::NormalFunctionMode,
SourceParseMode::GeneratorBodyMode,
SourceParseMode::GeneratorWrapperFunctionMode,
SourceParseMode::GeneratorWrapperMethodMode,
SourceParseMode::AsyncGeneratorWrapperFunctionMode,
SourceParseMode::AsyncGeneratorWrapperMethodMode,
SourceParseMode::AsyncGeneratorBodyMode
).contains(parseMode()) || isClass();
}
DerivedContextType derivedContextType() const { return m_unlinkedExecutable->derivedContextType(); }
bool isClassConstructorFunction() const { return m_unlinkedExecutable->isClassConstructorFunction(); }
const Identifier& name() { return m_unlinkedExecutable->name(); }
const Identifier& ecmaName() { return m_unlinkedExecutable->ecmaName(); }
unsigned parameterCount() const { return m_unlinkedExecutable->parameterCount(); } // Excluding 'this'!
SourceParseMode parseMode() const { return m_unlinkedExecutable->parseMode(); }
JSParserScriptMode scriptMode() const { return m_unlinkedExecutable->scriptMode(); }
SourceCode classSource() const { return m_unlinkedExecutable->classSource(); }
static void visitChildren(JSCell*, SlotVisitor&);
static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue proto)
{
return Structure::create(vm, globalObject, proto, TypeInfo(FunctionExecutableType, StructureFlags), info());
}
void setOverrideLineNumber(int overrideLineNumber)
{
if (overrideLineNumber == -1) {
if (UNLIKELY(m_rareData))
m_rareData->m_overrideLineNumber = WTF::nullopt;
return;
}
ensureRareData().m_overrideLineNumber = overrideLineNumber;
}
Optional<int> overrideLineNumber() const
{
if (UNLIKELY(m_rareData))
return m_rareData->m_overrideLineNumber;
return WTF::nullopt;
}
int lineCount() const
{
if (UNLIKELY(m_rareData))
return m_rareData->m_lineCount;
return m_unlinkedExecutable->lineCount();
}
int endColumn() const
{
if (UNLIKELY(m_rareData))
return m_rareData->m_endColumn;
return m_unlinkedExecutable->linkedEndColumn(m_source.startColumn().oneBasedInt());
}
int firstLine() const
{
return source().firstLine().oneBasedInt();
}
int lastLine() const
{
return firstLine() + lineCount();
}
unsigned typeProfilingStartOffset(VM&) const
{
return typeProfilingStartOffset();
}
unsigned typeProfilingStartOffset() const
{
if (UNLIKELY(m_rareData))
return m_rareData->m_typeProfilingStartOffset;
return m_unlinkedExecutable->typeProfilingStartOffset();
}
unsigned typeProfilingEndOffset(VM&) const
{
return typeProfilingEndOffset();
}
unsigned typeProfilingEndOffset() const
{
if (UNLIKELY(m_rareData))
return m_rareData->m_typeProfilingEndOffset;
return m_unlinkedExecutable->typeProfilingEndOffset();
}
unsigned parametersStartOffset() const
{
if (UNLIKELY(m_rareData))
return m_rareData->m_parametersStartOffset;
return m_unlinkedExecutable->parametersStartOffset();
}
void overrideInfo(const FunctionOverrideInfo&);
DECLARE_INFO;
InferredValue* singletonFunction()
{
if (VM::canUseJIT())
return m_singletonFunction.get();
return nullptr;
}
void notifyCreation(VM& vm, JSValue value, const char* reason)
{
if (VM::canUseJIT()) {
singletonFunction()->notifyWrite(vm, value, reason);
return;
}
switch (m_singletonFunctionState) {
case ClearWatchpoint:
m_singletonFunctionState = IsWatched;
return;
case IsWatched:
m_singletonFunctionState = IsInvalidated;
return;
case IsInvalidated:
return;
}
}
bool singletonFunctionHasBeenInvalidated()
{
if (VM::canUseJIT())
return singletonFunction()->hasBeenInvalidated();
return m_singletonFunctionState == IsInvalidated;
}
// Cached poly proto structure for the result of constructing this executable.
Structure* cachedPolyProtoStructure()
{
if (UNLIKELY(m_rareData))
return m_rareData->m_cachedPolyProtoStructure.get();
return nullptr;
}
void setCachedPolyProtoStructure(VM& vm, Structure* structure)
{
ensureRareData().m_cachedPolyProtoStructure.set(vm, this, structure);
}
InlineWatchpointSet& ensurePolyProtoWatchpoint()
{
if (!m_polyProtoWatchpoint)
m_polyProtoWatchpoint = Box<InlineWatchpointSet>::create(IsWatched);
return *m_polyProtoWatchpoint;
}
Box<InlineWatchpointSet> sharedPolyProtoWatchpoint() const { return m_polyProtoWatchpoint; }
ScriptExecutable* topLevelExecutable() const { return m_topLevelExecutable.get(); }
TemplateObjectMap& ensureTemplateObjectMap(VM&);
private:
friend class ExecutableBase;
FunctionExecutable(VM&, const SourceCode&, UnlinkedFunctionExecutable*, Intrinsic);
void finishCreation(VM&, ScriptExecutable* topLevelExecutable);
friend class ScriptExecutable;
struct RareData {
WTF_MAKE_STRUCT_FAST_ALLOCATED;
RefPtr<TypeSet> m_returnStatementTypeSet;
unsigned m_lineCount;
unsigned m_endColumn;
Markable<int, IntegralMarkableTraits<int, -1>> m_overrideLineNumber;
unsigned m_parametersStartOffset { 0 };
unsigned m_typeProfilingStartOffset { UINT_MAX };
unsigned m_typeProfilingEndOffset { UINT_MAX };
std::unique_ptr<TemplateObjectMap> m_templateObjectMap;
WriteBarrier<Structure> m_cachedPolyProtoStructure;
};
RareData& ensureRareData()
{
if (LIKELY(m_rareData))
return *m_rareData;
return ensureRareDataSlow();
}
RareData& ensureRareDataSlow();
// FIXME: We can merge rareData pointer and top-level executable pointer. First time, setting parent.
// If RareData is required, materialize RareData, swap it, and store top-level executable pointer inside RareData.
// https://bugs.webkit.org/show_bug.cgi?id=197625
std::unique_ptr<RareData> m_rareData;
WriteBarrier<ScriptExecutable> m_topLevelExecutable;
WriteBarrier<UnlinkedFunctionExecutable> m_unlinkedExecutable;
WriteBarrier<ExecutableToCodeBlockEdge> m_codeBlockForCall;
WriteBarrier<ExecutableToCodeBlockEdge> m_codeBlockForConstruct;
union {
WriteBarrier<InferredValue> m_singletonFunction;
WatchpointState m_singletonFunctionState;
};
Box<InlineWatchpointSet> m_polyProtoWatchpoint;
};
} // namespace JSC