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/*
* Copyright (C) 2012-2019 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 "BytecodeConventions.h"
#include "CodeType.h"
#include "DFGExitProfile.h"
#include "ExpressionRangeInfo.h"
#include "HandlerInfo.h"
#include "Identifier.h"
#include "InstructionStream.h"
#include "JSCast.h"
#include "LockDuringMarking.h"
#include "Opcode.h"
#include "ParserModes.h"
#include "RegExp.h"
#include "SpecialPointer.h"
#include "UnlinkedFunctionExecutable.h"
#include "UnlinkedMetadataTable.h"
#include "VirtualRegister.h"
#include <algorithm>
#include <wtf/BitVector.h>
#include <wtf/HashSet.h>
#include <wtf/TriState.h>
#include <wtf/Vector.h>
#include <wtf/text/UniquedStringImpl.h>
namespace JSC {
class BytecodeGenerator;
class BytecodeLivenessAnalysis;
class BytecodeRewriter;
class CodeBlock;
class Debugger;
class FunctionExecutable;
class ParserError;
class ScriptExecutable;
class SourceCode;
class SourceProvider;
class UnlinkedCodeBlock;
class UnlinkedFunctionCodeBlock;
class UnlinkedFunctionExecutable;
struct ExecutableInfo;
template<typename CodeBlockType>
class CachedCodeBlock;
typedef unsigned UnlinkedValueProfile;
typedef unsigned UnlinkedArrayProfile;
typedef unsigned UnlinkedArrayAllocationProfile;
typedef unsigned UnlinkedObjectAllocationProfile;
typedef unsigned UnlinkedLLIntCallLinkInfo;
using ConstantIdentifierSetEntry = std::pair<IdentifierSet, unsigned>;
struct UnlinkedStringJumpTable {
struct OffsetLocation {
int32_t branchOffset;
};
typedef HashMap<RefPtr<StringImpl>, OffsetLocation> StringOffsetTable;
StringOffsetTable offsetTable;
inline int32_t offsetForValue(StringImpl* value, int32_t defaultOffset)
{
StringOffsetTable::const_iterator end = offsetTable.end();
StringOffsetTable::const_iterator loc = offsetTable.find(value);
if (loc == end)
return defaultOffset;
return loc->value.branchOffset;
}
};
struct UnlinkedSimpleJumpTable {
Vector<int32_t> branchOffsets;
int32_t min;
int32_t offsetForValue(int32_t value, int32_t defaultOffset);
void add(int32_t key, int32_t offset)
{
if (!branchOffsets[key])
branchOffsets[key] = offset;
}
};
class UnlinkedCodeBlock : public JSCell {
public:
typedef JSCell Base;
static constexpr unsigned StructureFlags = Base::StructureFlags;
static constexpr bool needsDestruction = true;
enum { CallFunction, ApplyFunction };
bool isConstructor() const { return m_isConstructor; }
bool isStrictMode() const { return m_isStrictMode; }
bool usesEval() const { return m_usesEval; }
SourceParseMode parseMode() const { return m_parseMode; }
bool isArrowFunction() const { return isArrowFunctionParseMode(parseMode()); }
DerivedContextType derivedContextType() const { return static_cast<DerivedContextType>(m_derivedContextType); }
EvalContextType evalContextType() const { return static_cast<EvalContextType>(m_evalContextType); }
bool isArrowFunctionContext() const { return m_isArrowFunctionContext; }
bool isClassContext() const { return m_isClassContext; }
bool hasTailCalls() const { return m_hasTailCalls; }
void setHasTailCalls() { m_hasTailCalls = true; }
bool allowDirectEvalCache() const { return !(m_features & NoEvalCacheFeature); }
void addExpressionInfo(unsigned instructionOffset, int divot,
int startOffset, int endOffset, unsigned line, unsigned column);
void addTypeProfilerExpressionInfo(unsigned instructionOffset, unsigned startDivot, unsigned endDivot);
bool hasExpressionInfo() { return m_expressionInfo.size(); }
const Vector<ExpressionRangeInfo>& expressionInfo() { return m_expressionInfo; }
// Special registers
void setThisRegister(VirtualRegister thisRegister) { m_thisRegister = thisRegister; }
void setScopeRegister(VirtualRegister scopeRegister) { m_scopeRegister = scopeRegister; }
// Parameter information
void setNumParameters(int newValue) { m_numParameters = newValue; }
void addParameter() { m_numParameters++; }
unsigned numParameters() const { return m_numParameters; }
// Constant Pools
size_t numberOfIdentifiers() const { return m_identifiers.size(); }
void addIdentifier(const Identifier& i) { return m_identifiers.append(i); }
const Identifier& identifier(int index) const { return m_identifiers[index]; }
const Vector<Identifier>& identifiers() const { return m_identifiers; }
BitVector& bitVector(size_t i) { ASSERT(m_rareData); return m_rareData->m_bitVectors[i]; }
unsigned addBitVector(BitVector&& bitVector)
{
createRareDataIfNecessary();
m_rareData->m_bitVectors.append(WTFMove(bitVector));
return m_rareData->m_bitVectors.size() - 1;
}
void addSetConstant(IdentifierSet& set)
{
createRareDataIfNecessary();
VM& vm = this->vm();
auto locker = lockDuringMarking(vm.heap, cellLock());
unsigned result = m_constantRegisters.size();
m_constantRegisters.append(WriteBarrier<Unknown>());
m_constantsSourceCodeRepresentation.append(SourceCodeRepresentation::Other);
m_rareData->m_constantIdentifierSets.append(ConstantIdentifierSetEntry(set, result));
}
unsigned addConstant(JSValue v, SourceCodeRepresentation sourceCodeRepresentation = SourceCodeRepresentation::Other)
{
VM& vm = this->vm();
auto locker = lockDuringMarking(vm.heap, cellLock());
unsigned result = m_constantRegisters.size();
m_constantRegisters.append(WriteBarrier<Unknown>());
m_constantRegisters.last().set(vm, this, v);
m_constantsSourceCodeRepresentation.append(sourceCodeRepresentation);
return result;
}
unsigned addConstant(LinkTimeConstant type)
{
VM& vm = this->vm();
auto locker = lockDuringMarking(vm.heap, cellLock());
unsigned result = m_constantRegisters.size();
ASSERT(result);
unsigned index = static_cast<unsigned>(type);
ASSERT(index < LinkTimeConstantCount);
m_linkTimeConstants[index] = result;
m_constantRegisters.append(WriteBarrier<Unknown>());
m_constantsSourceCodeRepresentation.append(SourceCodeRepresentation::Other);
return result;
}
unsigned registerIndexForLinkTimeConstant(LinkTimeConstant type)
{
unsigned index = static_cast<unsigned>(type);
ASSERT(index < LinkTimeConstantCount);
return m_linkTimeConstants[index];
}
const Vector<WriteBarrier<Unknown>>& constantRegisters() { return m_constantRegisters; }
const WriteBarrier<Unknown>& constantRegister(int index) const { return m_constantRegisters[index - FirstConstantRegisterIndex]; }
ALWAYS_INLINE bool isConstantRegisterIndex(int index) const { return index >= FirstConstantRegisterIndex; }
ALWAYS_INLINE JSValue getConstant(int index) const { return m_constantRegisters[index - FirstConstantRegisterIndex].get(); }
const Vector<SourceCodeRepresentation>& constantsSourceCodeRepresentation() { return m_constantsSourceCodeRepresentation; }
unsigned numberOfConstantIdentifierSets() const { return m_rareData ? m_rareData->m_constantIdentifierSets.size() : 0; }
const Vector<ConstantIdentifierSetEntry>& constantIdentifierSets() { ASSERT(m_rareData); return m_rareData->m_constantIdentifierSets; }
// Jumps
size_t numberOfJumpTargets() const { return m_jumpTargets.size(); }
void addJumpTarget(unsigned jumpTarget) { m_jumpTargets.append(jumpTarget); }
unsigned jumpTarget(int index) const { return m_jumpTargets[index]; }
unsigned lastJumpTarget() const { return m_jumpTargets.last(); }
UnlinkedHandlerInfo* handlerForBytecodeOffset(unsigned bytecodeOffset, RequiredHandler = RequiredHandler::AnyHandler);
UnlinkedHandlerInfo* handlerForIndex(unsigned, RequiredHandler = RequiredHandler::AnyHandler);
bool isBuiltinFunction() const { return m_isBuiltinFunction; }
ConstructorKind constructorKind() const { return static_cast<ConstructorKind>(m_constructorKind); }
SuperBinding superBinding() const { return static_cast<SuperBinding>(m_superBinding); }
JSParserScriptMode scriptMode() const { return static_cast<JSParserScriptMode>(m_scriptMode); }
void shrinkToFit();
void setInstructions(std::unique_ptr<InstructionStream>);
const InstructionStream& instructions() const;
int numCalleeLocals() const { return m_numCalleeLocals; }
int numVars() const { return m_numVars; }
// Jump Tables
size_t numberOfSwitchJumpTables() const { return m_rareData ? m_rareData->m_switchJumpTables.size() : 0; }
UnlinkedSimpleJumpTable& addSwitchJumpTable() { createRareDataIfNecessary(); m_rareData->m_switchJumpTables.append(UnlinkedSimpleJumpTable()); return m_rareData->m_switchJumpTables.last(); }
UnlinkedSimpleJumpTable& switchJumpTable(int tableIndex) { ASSERT(m_rareData); return m_rareData->m_switchJumpTables[tableIndex]; }
size_t numberOfStringSwitchJumpTables() const { return m_rareData ? m_rareData->m_stringSwitchJumpTables.size() : 0; }
UnlinkedStringJumpTable& addStringSwitchJumpTable() { createRareDataIfNecessary(); m_rareData->m_stringSwitchJumpTables.append(UnlinkedStringJumpTable()); return m_rareData->m_stringSwitchJumpTables.last(); }
UnlinkedStringJumpTable& stringSwitchJumpTable(int tableIndex) { ASSERT(m_rareData); return m_rareData->m_stringSwitchJumpTables[tableIndex]; }
unsigned addFunctionDecl(UnlinkedFunctionExecutable* n)
{
VM& vm = this->vm();
auto locker = lockDuringMarking(vm.heap, cellLock());
unsigned size = m_functionDecls.size();
m_functionDecls.append(WriteBarrier<UnlinkedFunctionExecutable>());
m_functionDecls.last().set(vm, this, n);
return size;
}
UnlinkedFunctionExecutable* functionDecl(int index) { return m_functionDecls[index].get(); }
size_t numberOfFunctionDecls() { return m_functionDecls.size(); }
unsigned addFunctionExpr(UnlinkedFunctionExecutable* n)
{
VM& vm = this->vm();
auto locker = lockDuringMarking(vm.heap, cellLock());
unsigned size = m_functionExprs.size();
m_functionExprs.append(WriteBarrier<UnlinkedFunctionExecutable>());
m_functionExprs.last().set(vm, this, n);
return size;
}
UnlinkedFunctionExecutable* functionExpr(int index) { return m_functionExprs[index].get(); }
size_t numberOfFunctionExprs() { return m_functionExprs.size(); }
// Exception handling support
size_t numberOfExceptionHandlers() const { return m_rareData ? m_rareData->m_exceptionHandlers.size() : 0; }
void addExceptionHandler(const UnlinkedHandlerInfo& handler) { createRareDataIfNecessary(); return m_rareData->m_exceptionHandlers.append(handler); }
UnlinkedHandlerInfo& exceptionHandler(int index) { ASSERT(m_rareData); return m_rareData->m_exceptionHandlers[index]; }
CodeType codeType() const { return static_cast<CodeType>(m_codeType); }
VirtualRegister thisRegister() const { return m_thisRegister; }
VirtualRegister scopeRegister() const { return m_scopeRegister; }
bool hasRareData() const { return m_rareData.get(); }
int lineNumberForBytecodeOffset(unsigned bytecodeOffset);
void expressionRangeForBytecodeOffset(unsigned bytecodeOffset, int& divot,
int& startOffset, int& endOffset, unsigned& line, unsigned& column) const;
bool typeProfilerExpressionInfoForBytecodeOffset(unsigned bytecodeOffset, unsigned& startDivot, unsigned& endDivot);
void recordParse(CodeFeatures features, bool hasCapturedVariables, unsigned lineCount, unsigned endColumn)
{
m_features = features;
m_hasCapturedVariables = hasCapturedVariables;
m_lineCount = lineCount;
// For the UnlinkedCodeBlock, startColumn is always 0.
m_endColumn = endColumn;
}
const String& sourceURLDirective() const { return m_sourceURLDirective; }
const String& sourceMappingURLDirective() const { return m_sourceMappingURLDirective; }
void setSourceURLDirective(const String& sourceURL) { m_sourceURLDirective = sourceURL; }
void setSourceMappingURLDirective(const String& sourceMappingURL) { m_sourceMappingURLDirective = sourceMappingURL; }
CodeFeatures codeFeatures() const { return m_features; }
bool hasCapturedVariables() const { return m_hasCapturedVariables; }
unsigned lineCount() const { return m_lineCount; }
ALWAYS_INLINE unsigned startColumn() const { return 0; }
unsigned endColumn() const { return m_endColumn; }
void addOpProfileControlFlowBytecodeOffset(InstructionStream::Offset offset)
{
createRareDataIfNecessary();
m_rareData->m_opProfileControlFlowBytecodeOffsets.append(offset);
}
const Vector<InstructionStream::Offset>& opProfileControlFlowBytecodeOffsets() const
{
ASSERT(m_rareData);
return m_rareData->m_opProfileControlFlowBytecodeOffsets;
}
bool hasOpProfileControlFlowBytecodeOffsets() const
{
return m_rareData && !m_rareData->m_opProfileControlFlowBytecodeOffsets.isEmpty();
}
void dumpExpressionRangeInfo(); // For debugging purpose only.
bool wasCompiledWithDebuggingOpcodes() const { return m_codeGenerationMode.contains(CodeGenerationMode::Debugger); }
bool wasCompiledWithTypeProfilerOpcodes() const { return m_codeGenerationMode.contains(CodeGenerationMode::TypeProfiler); }
bool wasCompiledWithControlFlowProfilerOpcodes() const { return m_codeGenerationMode.contains(CodeGenerationMode::ControlFlowProfiler); }
OptionSet<CodeGenerationMode> codeGenerationMode() const { return m_codeGenerationMode; }
TriState didOptimize() const { return static_cast<TriState>(m_didOptimize); }
void setDidOptimize(TriState didOptimize) { m_didOptimize = static_cast<unsigned>(didOptimize); }
static constexpr unsigned maxAge = 7;
unsigned age() const { return m_age; }
void resetAge() { m_age = 0; }
void dump(PrintStream&) const;
BytecodeLivenessAnalysis& livenessAnalysis(CodeBlock* codeBlock)
{
if (m_liveness)
return *m_liveness;
return livenessAnalysisSlow(codeBlock);
}
#if ENABLE(DFG_JIT)
bool hasExitSite(const ConcurrentJSLocker& locker, const DFG::FrequentExitSite& site) const
{
return m_exitProfile.hasExitSite(locker, site);
}
bool hasExitSite(const DFG::FrequentExitSite& site)
{
ConcurrentJSLocker locker(m_lock);
return hasExitSite(locker, site);
}
DFG::ExitProfile& exitProfile() { return m_exitProfile; }
#endif
UnlinkedMetadataTable& metadata() { return m_metadata.get(); }
size_t metadataSizeInBytes()
{
return m_metadata->sizeInBytes();
}
protected:
UnlinkedCodeBlock(VM&, Structure*, CodeType, const ExecutableInfo&, OptionSet<CodeGenerationMode>);
template<typename CodeBlockType>
UnlinkedCodeBlock(Decoder&, Structure*, const CachedCodeBlock<CodeBlockType>&);
~UnlinkedCodeBlock();
void finishCreation(VM& vm)
{
Base::finishCreation(vm);
}
private:
friend class BytecodeRewriter;
friend class BytecodeGenerator;
template<typename CodeBlockType>
friend class CachedCodeBlock;
void applyModification(BytecodeRewriter&, InstructionStreamWriter&);
void createRareDataIfNecessary()
{
if (!m_rareData) {
auto locker = lockDuringMarking(*heap(), cellLock());
m_rareData = makeUnique<RareData>();
}
}
void getLineAndColumn(const ExpressionRangeInfo&, unsigned& line, unsigned& column) const;
BytecodeLivenessAnalysis& livenessAnalysisSlow(CodeBlock*);
VirtualRegister m_thisRegister;
VirtualRegister m_scopeRegister;
std::array<unsigned, LinkTimeConstantCount> m_linkTimeConstants;
unsigned m_usesEval : 1;
unsigned m_isStrictMode : 1;
unsigned m_isConstructor : 1;
unsigned m_hasCapturedVariables : 1;
unsigned m_isBuiltinFunction : 1;
unsigned m_superBinding : 1;
unsigned m_scriptMode: 1;
unsigned m_isArrowFunctionContext : 1;
unsigned m_isClassContext : 1;
unsigned m_hasTailCalls : 1;
unsigned m_constructorKind : 2;
unsigned m_derivedContextType : 2;
unsigned m_evalContextType : 2;
unsigned m_codeType : 2;
unsigned m_didOptimize : 2;
unsigned m_age : 3;
static_assert(((1U << 3) - 1) >= maxAge);
public:
ConcurrentJSLock m_lock;
private:
CodeFeatures m_features { 0 };
SourceParseMode m_parseMode;
OptionSet<CodeGenerationMode> m_codeGenerationMode;
unsigned m_lineCount { 0 };
unsigned m_endColumn { UINT_MAX };
int m_numVars { 0 };
int m_numCalleeLocals { 0 };
int m_numParameters { 0 };
String m_sourceURLDirective;
String m_sourceMappingURLDirective;
Vector<InstructionStream::Offset> m_jumpTargets;
Ref<UnlinkedMetadataTable> m_metadata;
std::unique_ptr<InstructionStream> m_instructions;
std::unique_ptr<BytecodeLivenessAnalysis> m_liveness;
#if ENABLE(DFG_JIT)
DFG::ExitProfile m_exitProfile;
#endif
// Constant Pools
Vector<Identifier> m_identifiers;
Vector<WriteBarrier<Unknown>> m_constantRegisters;
Vector<SourceCodeRepresentation> m_constantsSourceCodeRepresentation;
typedef Vector<WriteBarrier<UnlinkedFunctionExecutable>> FunctionExpressionVector;
FunctionExpressionVector m_functionDecls;
FunctionExpressionVector m_functionExprs;
public:
struct RareData {
WTF_MAKE_STRUCT_FAST_ALLOCATED;
Vector<UnlinkedHandlerInfo> m_exceptionHandlers;
// Jump Tables
Vector<UnlinkedSimpleJumpTable> m_switchJumpTables;
Vector<UnlinkedStringJumpTable> m_stringSwitchJumpTables;
Vector<ExpressionRangeInfo::FatPosition> m_expressionInfoFatPositions;
struct TypeProfilerExpressionRange {
unsigned m_startDivot;
unsigned m_endDivot;
};
HashMap<unsigned, TypeProfilerExpressionRange> m_typeProfilerInfoMap;
Vector<InstructionStream::Offset> m_opProfileControlFlowBytecodeOffsets;
Vector<BitVector> m_bitVectors;
Vector<ConstantIdentifierSetEntry> m_constantIdentifierSets;
};
void addOutOfLineJumpTarget(InstructionStream::Offset, int target);
int outOfLineJumpOffset(InstructionStream::Offset);
int outOfLineJumpOffset(const InstructionStream::Ref& instruction)
{
return outOfLineJumpOffset(instruction.offset());
}
private:
using OutOfLineJumpTargets = HashMap<InstructionStream::Offset, int>;
OutOfLineJumpTargets replaceOutOfLineJumpTargets()
{
OutOfLineJumpTargets newJumpTargets;
std::swap(m_outOfLineJumpTargets, newJumpTargets);
return newJumpTargets;
}
OutOfLineJumpTargets m_outOfLineJumpTargets;
std::unique_ptr<RareData> m_rareData;
Vector<ExpressionRangeInfo> m_expressionInfo;
protected:
static void visitChildren(JSCell*, SlotVisitor&);
static size_t estimatedSize(JSCell*, VM&);
public:
DECLARE_INFO;
};
}