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CodeBlock.cpp
3131 lines (2700 loc) · 116 KB
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CodeBlock.cpp
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/*
* Copyright (C) 2008-2017 Apple Inc. All rights reserved.
* Copyright (C) 2008 Cameron Zwarich <cwzwarich@uwaterloo.ca>
*
* 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.
* 3. Neither the name of Apple Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 OR ITS 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 "CodeBlock.h"
#include "ArithProfile.h"
#include "BasicBlockLocation.h"
#include "BytecodeDumper.h"
#include "BytecodeGenerator.h"
#include "BytecodeLivenessAnalysis.h"
#include "BytecodeUseDef.h"
#include "CallLinkStatus.h"
#include "CodeBlockSet.h"
#include "DFGCapabilities.h"
#include "DFGCommon.h"
#include "DFGDriver.h"
#include "DFGJITCode.h"
#include "DFGWorklist.h"
#include "Debugger.h"
#include "EvalCodeBlock.h"
#include "FullCodeOrigin.h"
#include "FunctionCodeBlock.h"
#include "FunctionExecutableDump.h"
#include "GetPutInfo.h"
#include "InlineCallFrame.h"
#include "InterpreterInlines.h"
#include "JIT.h"
#include "JITMathIC.h"
#include "JSCInlines.h"
#include "JSCJSValue.h"
#include "JSFunction.h"
#include "JSLexicalEnvironment.h"
#include "JSModuleEnvironment.h"
#include "JSSet.h"
#include "JSString.h"
#include "JSTemplateRegistryKey.h"
#include "LLIntData.h"
#include "LLIntEntrypoint.h"
#include "LLIntPrototypeLoadAdaptiveStructureWatchpoint.h"
#include "LowLevelInterpreter.h"
#include "ModuleProgramCodeBlock.h"
#include "PCToCodeOriginMap.h"
#include "PolymorphicAccess.h"
#include "ProfilerDatabase.h"
#include "ProgramCodeBlock.h"
#include "ReduceWhitespace.h"
#include "Repatch.h"
#include "SlotVisitorInlines.h"
#include "StackVisitor.h"
#include "StructureStubInfo.h"
#include "TypeLocationCache.h"
#include "TypeProfiler.h"
#include "UnlinkedInstructionStream.h"
#include "VMInlines.h"
#include <wtf/BagToHashMap.h>
#include <wtf/CommaPrinter.h>
#include <wtf/SimpleStats.h>
#include <wtf/StringExtras.h>
#include <wtf/StringPrintStream.h>
#include <wtf/text/UniquedStringImpl.h>
#if ENABLE(JIT)
#include "RegisterAtOffsetList.h"
#endif
#if ENABLE(DFG_JIT)
#include "DFGOperations.h"
#endif
#if ENABLE(FTL_JIT)
#include "FTLJITCode.h"
#endif
namespace JSC {
const ClassInfo CodeBlock::s_info = {
"CodeBlock", nullptr, nullptr, nullptr,
CREATE_METHOD_TABLE(CodeBlock)
};
CString CodeBlock::inferredName() const
{
switch (codeType()) {
case GlobalCode:
return "<global>";
case EvalCode:
return "<eval>";
case FunctionCode:
return jsCast<FunctionExecutable*>(ownerExecutable())->inferredName().utf8();
case ModuleCode:
return "<module>";
default:
CRASH();
return CString("", 0);
}
}
bool CodeBlock::hasHash() const
{
return !!m_hash;
}
bool CodeBlock::isSafeToComputeHash() const
{
return !isCompilationThread();
}
CodeBlockHash CodeBlock::hash() const
{
if (!m_hash) {
RELEASE_ASSERT(isSafeToComputeHash());
m_hash = CodeBlockHash(ownerScriptExecutable()->source(), specializationKind());
}
return m_hash;
}
CString CodeBlock::sourceCodeForTools() const
{
if (codeType() != FunctionCode)
return ownerScriptExecutable()->source().toUTF8();
SourceProvider* provider = source();
FunctionExecutable* executable = jsCast<FunctionExecutable*>(ownerExecutable());
UnlinkedFunctionExecutable* unlinked = executable->unlinkedExecutable();
unsigned unlinkedStartOffset = unlinked->startOffset();
unsigned linkedStartOffset = executable->source().startOffset();
int delta = linkedStartOffset - unlinkedStartOffset;
unsigned rangeStart = delta + unlinked->unlinkedFunctionNameStart();
unsigned rangeEnd = delta + unlinked->startOffset() + unlinked->sourceLength();
return toCString(
"function ",
provider->source().substring(rangeStart, rangeEnd - rangeStart).utf8());
}
CString CodeBlock::sourceCodeOnOneLine() const
{
return reduceWhitespace(sourceCodeForTools());
}
CString CodeBlock::hashAsStringIfPossible() const
{
if (hasHash() || isSafeToComputeHash())
return toCString(hash());
return "<no-hash>";
}
void CodeBlock::dumpAssumingJITType(PrintStream& out, JITCode::JITType jitType) const
{
out.print(inferredName(), "#", hashAsStringIfPossible());
out.print(":[", RawPointer(this), "->");
if (!!m_alternative)
out.print(RawPointer(alternative()), "->");
out.print(RawPointer(ownerExecutable()), ", ", jitType, codeType());
if (codeType() == FunctionCode)
out.print(specializationKind());
out.print(", ", instructionCount());
if (this->jitType() == JITCode::BaselineJIT && m_shouldAlwaysBeInlined)
out.print(" (ShouldAlwaysBeInlined)");
if (ownerScriptExecutable()->neverInline())
out.print(" (NeverInline)");
if (ownerScriptExecutable()->neverOptimize())
out.print(" (NeverOptimize)");
else if (ownerScriptExecutable()->neverFTLOptimize())
out.print(" (NeverFTLOptimize)");
if (ownerScriptExecutable()->didTryToEnterInLoop())
out.print(" (DidTryToEnterInLoop)");
if (ownerScriptExecutable()->isStrictMode())
out.print(" (StrictMode)");
if (m_didFailJITCompilation)
out.print(" (JITFail)");
if (this->jitType() == JITCode::BaselineJIT && m_didFailFTLCompilation)
out.print(" (FTLFail)");
if (this->jitType() == JITCode::BaselineJIT && m_hasBeenCompiledWithFTL)
out.print(" (HadFTLReplacement)");
out.print("]");
}
void CodeBlock::dump(PrintStream& out) const
{
dumpAssumingJITType(out, jitType());
}
void CodeBlock::dumpSource()
{
dumpSource(WTF::dataFile());
}
void CodeBlock::dumpSource(PrintStream& out)
{
ScriptExecutable* executable = ownerScriptExecutable();
if (executable->isFunctionExecutable()) {
FunctionExecutable* functionExecutable = reinterpret_cast<FunctionExecutable*>(executable);
StringView source = functionExecutable->source().provider()->getRange(
functionExecutable->parametersStartOffset(),
functionExecutable->typeProfilingEndOffset() + 1); // Type profiling end offset is the character before the '}'.
out.print("function ", inferredName(), source);
return;
}
out.print(executable->source().view());
}
void CodeBlock::dumpBytecode()
{
dumpBytecode(WTF::dataFile());
}
void CodeBlock::dumpBytecode(PrintStream& out)
{
StubInfoMap stubInfos;
CallLinkInfoMap callLinkInfos;
getStubInfoMap(stubInfos);
getCallLinkInfoMap(callLinkInfos);
BytecodeDumper<CodeBlock>::dumpBlock(this, instructions(), out, stubInfos, callLinkInfos);
}
void CodeBlock::dumpBytecode(PrintStream& out, const Instruction* begin, const Instruction*& it, const StubInfoMap& stubInfos, const CallLinkInfoMap& callLinkInfos)
{
BytecodeDumper<CodeBlock>::dumpBytecode(this, out, begin, it, stubInfos, callLinkInfos);
}
void CodeBlock::dumpBytecode(
PrintStream& out, unsigned bytecodeOffset,
const StubInfoMap& stubInfos, const CallLinkInfoMap& callLinkInfos)
{
const Instruction* it = instructions().begin() + bytecodeOffset;
dumpBytecode(out, instructions().begin(), it, stubInfos, callLinkInfos);
}
#define FOR_EACH_MEMBER_VECTOR(macro) \
macro(instructions) \
macro(callLinkInfos) \
macro(linkedCallerList) \
macro(identifiers) \
macro(functionExpressions) \
macro(constantRegisters)
template<typename T>
static size_t sizeInBytes(const Vector<T>& vector)
{
return vector.capacity() * sizeof(T);
}
namespace {
class PutToScopeFireDetail : public FireDetail {
public:
PutToScopeFireDetail(CodeBlock* codeBlock, const Identifier& ident)
: m_codeBlock(codeBlock)
, m_ident(ident)
{
}
void dump(PrintStream& out) const override
{
out.print("Linking put_to_scope in ", FunctionExecutableDump(jsCast<FunctionExecutable*>(m_codeBlock->ownerExecutable())), " for ", m_ident);
}
private:
CodeBlock* m_codeBlock;
const Identifier& m_ident;
};
} // anonymous namespace
CodeBlock::CodeBlock(VM* vm, Structure* structure, CopyParsedBlockTag, CodeBlock& other)
: JSCell(*vm, structure)
, m_globalObject(other.m_globalObject)
, m_numCalleeLocals(other.m_numCalleeLocals)
, m_numVars(other.m_numVars)
, m_shouldAlwaysBeInlined(true)
#if ENABLE(JIT)
, m_capabilityLevelState(DFG::CapabilityLevelNotSet)
#endif
, m_didFailJITCompilation(false)
, m_didFailFTLCompilation(false)
, m_hasBeenCompiledWithFTL(false)
, m_isConstructor(other.m_isConstructor)
, m_isStrictMode(other.m_isStrictMode)
, m_codeType(other.m_codeType)
, m_unlinkedCode(*other.m_vm, this, other.m_unlinkedCode.get())
, m_numberOfArgumentsToSkip(other.m_numberOfArgumentsToSkip)
, m_hasDebuggerStatement(false)
, m_steppingMode(SteppingModeDisabled)
, m_numBreakpoints(0)
, m_ownerExecutable(*other.m_vm, this, other.m_ownerExecutable.get())
, m_vm(other.m_vm)
, m_instructions(other.m_instructions)
, m_thisRegister(other.m_thisRegister)
, m_scopeRegister(other.m_scopeRegister)
, m_hash(other.m_hash)
, m_source(other.m_source)
, m_sourceOffset(other.m_sourceOffset)
, m_firstLineColumnOffset(other.m_firstLineColumnOffset)
, m_constantRegisters(other.m_constantRegisters)
, m_constantsSourceCodeRepresentation(other.m_constantsSourceCodeRepresentation)
, m_functionDecls(other.m_functionDecls)
, m_functionExprs(other.m_functionExprs)
, m_osrExitCounter(0)
, m_optimizationDelayCounter(0)
, m_reoptimizationRetryCounter(0)
, m_creationTime(std::chrono::steady_clock::now())
{
m_visitWeaklyHasBeenCalled = false;
ASSERT(heap()->isDeferred());
ASSERT(m_scopeRegister.isLocal());
setNumParameters(other.numParameters());
}
void CodeBlock::finishCreation(VM& vm, CopyParsedBlockTag, CodeBlock& other)
{
Base::finishCreation(vm);
optimizeAfterWarmUp();
jitAfterWarmUp();
if (other.m_rareData) {
createRareDataIfNecessary();
m_rareData->m_exceptionHandlers = other.m_rareData->m_exceptionHandlers;
m_rareData->m_constantBuffers = other.m_rareData->m_constantBuffers;
m_rareData->m_switchJumpTables = other.m_rareData->m_switchJumpTables;
m_rareData->m_stringSwitchJumpTables = other.m_rareData->m_stringSwitchJumpTables;
}
heap()->m_codeBlocks->add(this);
}
CodeBlock::CodeBlock(VM* vm, Structure* structure, ScriptExecutable* ownerExecutable, UnlinkedCodeBlock* unlinkedCodeBlock,
JSScope* scope, RefPtr<SourceProvider>&& sourceProvider, unsigned sourceOffset, unsigned firstLineColumnOffset)
: JSCell(*vm, structure)
, m_globalObject(scope->globalObject()->vm(), this, scope->globalObject())
, m_numCalleeLocals(unlinkedCodeBlock->m_numCalleeLocals)
, m_numVars(unlinkedCodeBlock->m_numVars)
, m_shouldAlwaysBeInlined(true)
#if ENABLE(JIT)
, m_capabilityLevelState(DFG::CapabilityLevelNotSet)
#endif
, m_didFailJITCompilation(false)
, m_didFailFTLCompilation(false)
, m_hasBeenCompiledWithFTL(false)
, m_isConstructor(unlinkedCodeBlock->isConstructor())
, m_isStrictMode(unlinkedCodeBlock->isStrictMode())
, m_codeType(unlinkedCodeBlock->codeType())
, m_unlinkedCode(m_globalObject->vm(), this, unlinkedCodeBlock)
, m_hasDebuggerStatement(false)
, m_steppingMode(SteppingModeDisabled)
, m_numBreakpoints(0)
, m_ownerExecutable(m_globalObject->vm(), this, ownerExecutable)
, m_vm(unlinkedCodeBlock->vm())
, m_thisRegister(unlinkedCodeBlock->thisRegister())
, m_scopeRegister(unlinkedCodeBlock->scopeRegister())
, m_source(WTFMove(sourceProvider))
, m_sourceOffset(sourceOffset)
, m_firstLineColumnOffset(firstLineColumnOffset)
, m_osrExitCounter(0)
, m_optimizationDelayCounter(0)
, m_reoptimizationRetryCounter(0)
, m_creationTime(std::chrono::steady_clock::now())
{
m_visitWeaklyHasBeenCalled = false;
ASSERT(heap()->isDeferred());
ASSERT(m_scopeRegister.isLocal());
ASSERT(m_source);
setNumParameters(unlinkedCodeBlock->numParameters());
}
bool CodeBlock::finishCreation(VM& vm, ScriptExecutable* ownerExecutable, UnlinkedCodeBlock* unlinkedCodeBlock,
JSScope* scope)
{
Base::finishCreation(vm);
auto throwScope = DECLARE_THROW_SCOPE(vm);
if (vm.typeProfiler() || vm.controlFlowProfiler())
vm.functionHasExecutedCache()->removeUnexecutedRange(ownerExecutable->sourceID(), ownerExecutable->typeProfilingStartOffset(), ownerExecutable->typeProfilingEndOffset());
setConstantRegisters(unlinkedCodeBlock->constantRegisters(), unlinkedCodeBlock->constantsSourceCodeRepresentation());
RETURN_IF_EXCEPTION(throwScope, false);
setConstantIdentifierSetRegisters(vm, unlinkedCodeBlock->constantIdentifierSets());
RETURN_IF_EXCEPTION(throwScope, false);
if (unlinkedCodeBlock->usesGlobalObject())
m_constantRegisters[unlinkedCodeBlock->globalObjectRegister().toConstantIndex()].set(*m_vm, this, m_globalObject.get());
for (unsigned i = 0; i < LinkTimeConstantCount; i++) {
LinkTimeConstant type = static_cast<LinkTimeConstant>(i);
if (unsigned registerIndex = unlinkedCodeBlock->registerIndexForLinkTimeConstant(type))
m_constantRegisters[registerIndex].set(*m_vm, this, m_globalObject->jsCellForLinkTimeConstant(type));
}
// We already have the cloned symbol table for the module environment since we need to instantiate
// the module environments before linking the code block. We replace the stored symbol table with the already cloned one.
if (UnlinkedModuleProgramCodeBlock* unlinkedModuleProgramCodeBlock = jsDynamicCast<UnlinkedModuleProgramCodeBlock*>(vm, unlinkedCodeBlock)) {
SymbolTable* clonedSymbolTable = jsCast<ModuleProgramExecutable*>(ownerExecutable)->moduleEnvironmentSymbolTable();
if (m_vm->typeProfiler()) {
ConcurrentJSLocker locker(clonedSymbolTable->m_lock);
clonedSymbolTable->prepareForTypeProfiling(locker);
}
replaceConstant(unlinkedModuleProgramCodeBlock->moduleEnvironmentSymbolTableConstantRegisterOffset(), clonedSymbolTable);
}
bool shouldUpdateFunctionHasExecutedCache = vm.typeProfiler() || vm.controlFlowProfiler();
m_functionDecls = RefCountedArray<WriteBarrier<FunctionExecutable>>(unlinkedCodeBlock->numberOfFunctionDecls());
for (size_t count = unlinkedCodeBlock->numberOfFunctionDecls(), i = 0; i < count; ++i) {
UnlinkedFunctionExecutable* unlinkedExecutable = unlinkedCodeBlock->functionDecl(i);
if (shouldUpdateFunctionHasExecutedCache)
vm.functionHasExecutedCache()->insertUnexecutedRange(ownerExecutable->sourceID(), unlinkedExecutable->typeProfilingStartOffset(), unlinkedExecutable->typeProfilingEndOffset());
m_functionDecls[i].set(*m_vm, this, unlinkedExecutable->link(*m_vm, ownerExecutable->source()));
}
m_functionExprs = RefCountedArray<WriteBarrier<FunctionExecutable>>(unlinkedCodeBlock->numberOfFunctionExprs());
for (size_t count = unlinkedCodeBlock->numberOfFunctionExprs(), i = 0; i < count; ++i) {
UnlinkedFunctionExecutable* unlinkedExecutable = unlinkedCodeBlock->functionExpr(i);
if (shouldUpdateFunctionHasExecutedCache)
vm.functionHasExecutedCache()->insertUnexecutedRange(ownerExecutable->sourceID(), unlinkedExecutable->typeProfilingStartOffset(), unlinkedExecutable->typeProfilingEndOffset());
m_functionExprs[i].set(*m_vm, this, unlinkedExecutable->link(*m_vm, ownerExecutable->source()));
}
if (unlinkedCodeBlock->hasRareData()) {
createRareDataIfNecessary();
if (size_t count = unlinkedCodeBlock->constantBufferCount()) {
m_rareData->m_constantBuffers.grow(count);
for (size_t i = 0; i < count; i++) {
const UnlinkedCodeBlock::ConstantBuffer& buffer = unlinkedCodeBlock->constantBuffer(i);
m_rareData->m_constantBuffers[i] = buffer;
}
}
if (size_t count = unlinkedCodeBlock->numberOfExceptionHandlers()) {
m_rareData->m_exceptionHandlers.resizeToFit(count);
for (size_t i = 0; i < count; i++) {
const UnlinkedHandlerInfo& unlinkedHandler = unlinkedCodeBlock->exceptionHandler(i);
HandlerInfo& handler = m_rareData->m_exceptionHandlers[i];
#if ENABLE(JIT)
handler.initialize(unlinkedHandler, CodeLocationLabel(MacroAssemblerCodePtr::createFromExecutableAddress(LLInt::getCodePtr(op_catch))));
#else
handler.initialize(unlinkedHandler);
#endif
}
}
if (size_t count = unlinkedCodeBlock->numberOfStringSwitchJumpTables()) {
m_rareData->m_stringSwitchJumpTables.grow(count);
for (size_t i = 0; i < count; i++) {
UnlinkedStringJumpTable::StringOffsetTable::iterator ptr = unlinkedCodeBlock->stringSwitchJumpTable(i).offsetTable.begin();
UnlinkedStringJumpTable::StringOffsetTable::iterator end = unlinkedCodeBlock->stringSwitchJumpTable(i).offsetTable.end();
for (; ptr != end; ++ptr) {
OffsetLocation offset;
offset.branchOffset = ptr->value.branchOffset;
m_rareData->m_stringSwitchJumpTables[i].offsetTable.add(ptr->key, offset);
}
}
}
if (size_t count = unlinkedCodeBlock->numberOfSwitchJumpTables()) {
m_rareData->m_switchJumpTables.grow(count);
for (size_t i = 0; i < count; i++) {
UnlinkedSimpleJumpTable& sourceTable = unlinkedCodeBlock->switchJumpTable(i);
SimpleJumpTable& destTable = m_rareData->m_switchJumpTables[i];
destTable.branchOffsets = sourceTable.branchOffsets;
destTable.min = sourceTable.min;
}
}
}
// Allocate metadata buffers for the bytecode
if (size_t size = unlinkedCodeBlock->numberOfLLintCallLinkInfos())
m_llintCallLinkInfos = RefCountedArray<LLIntCallLinkInfo>(size);
if (size_t size = unlinkedCodeBlock->numberOfArrayProfiles())
m_arrayProfiles.grow(size);
if (size_t size = unlinkedCodeBlock->numberOfArrayAllocationProfiles())
m_arrayAllocationProfiles = RefCountedArray<ArrayAllocationProfile>(size);
if (size_t size = unlinkedCodeBlock->numberOfValueProfiles())
m_valueProfiles = RefCountedArray<ValueProfile>(size);
if (size_t size = unlinkedCodeBlock->numberOfObjectAllocationProfiles())
m_objectAllocationProfiles = RefCountedArray<ObjectAllocationProfile>(size);
#if ENABLE(JIT)
setCalleeSaveRegisters(RegisterSet::llintBaselineCalleeSaveRegisters());
#endif
// Copy and translate the UnlinkedInstructions
unsigned instructionCount = unlinkedCodeBlock->instructions().count();
UnlinkedInstructionStream::Reader instructionReader(unlinkedCodeBlock->instructions());
// Bookkeep the strongly referenced module environments.
HashSet<JSModuleEnvironment*> stronglyReferencedModuleEnvironments;
RefCountedArray<Instruction> instructions(instructionCount);
unsigned valueProfileCount = 0;
auto linkValueProfile = [&](unsigned bytecodeOffset, unsigned opLength) {
unsigned valueProfileIndex = valueProfileCount++;
ValueProfile* profile = &m_valueProfiles[valueProfileIndex];
ASSERT(profile->m_bytecodeOffset == -1);
profile->m_bytecodeOffset = bytecodeOffset;
instructions[bytecodeOffset + opLength - 1] = profile;
};
for (unsigned i = 0; !instructionReader.atEnd(); ) {
const UnlinkedInstruction* pc = instructionReader.next();
unsigned opLength = opcodeLength(pc[0].u.opcode);
instructions[i] = Interpreter::getOpcode(pc[0].u.opcode);
for (size_t j = 1; j < opLength; ++j) {
if (sizeof(int32_t) != sizeof(intptr_t))
instructions[i + j].u.pointer = 0;
instructions[i + j].u.operand = pc[j].u.operand;
}
switch (pc[0].u.opcode) {
case op_has_indexed_property: {
int arrayProfileIndex = pc[opLength - 1].u.operand;
m_arrayProfiles[arrayProfileIndex] = ArrayProfile(i);
instructions[i + opLength - 1] = &m_arrayProfiles[arrayProfileIndex];
break;
}
case op_call_varargs:
case op_tail_call_varargs:
case op_tail_call_forward_arguments:
case op_construct_varargs:
case op_get_by_val: {
int arrayProfileIndex = pc[opLength - 2].u.operand;
m_arrayProfiles[arrayProfileIndex] = ArrayProfile(i);
instructions[i + opLength - 2] = &m_arrayProfiles[arrayProfileIndex];
FALLTHROUGH;
}
case op_get_direct_pname:
case op_get_by_id:
case op_get_by_id_with_this:
case op_try_get_by_id:
case op_get_by_val_with_this:
case op_get_from_arguments:
case op_to_number:
case op_get_argument: {
linkValueProfile(i, opLength);
break;
}
case op_in:
case op_put_by_val:
case op_put_by_val_direct: {
int arrayProfileIndex = pc[opLength - 1].u.operand;
m_arrayProfiles[arrayProfileIndex] = ArrayProfile(i);
instructions[i + opLength - 1] = &m_arrayProfiles[arrayProfileIndex];
break;
}
case op_new_array:
case op_new_array_buffer:
case op_new_array_with_size: {
int arrayAllocationProfileIndex = pc[opLength - 1].u.operand;
instructions[i + opLength - 1] = &m_arrayAllocationProfiles[arrayAllocationProfileIndex];
break;
}
case op_new_object: {
int objectAllocationProfileIndex = pc[opLength - 1].u.operand;
ObjectAllocationProfile* objectAllocationProfile = &m_objectAllocationProfiles[objectAllocationProfileIndex];
int inferredInlineCapacity = pc[opLength - 2].u.operand;
instructions[i + opLength - 1] = objectAllocationProfile;
objectAllocationProfile->initialize(vm,
m_globalObject.get(), this, m_globalObject->objectPrototype(), inferredInlineCapacity);
break;
}
case op_call:
case op_tail_call:
case op_call_eval: {
linkValueProfile(i, opLength);
int arrayProfileIndex = pc[opLength - 2].u.operand;
m_arrayProfiles[arrayProfileIndex] = ArrayProfile(i);
instructions[i + opLength - 2] = &m_arrayProfiles[arrayProfileIndex];
instructions[i + 5] = &m_llintCallLinkInfos[pc[5].u.operand];
break;
}
case op_construct: {
instructions[i + 5] = &m_llintCallLinkInfos[pc[5].u.operand];
linkValueProfile(i, opLength);
break;
}
case op_get_array_length:
CRASH();
case op_resolve_scope: {
const Identifier& ident = identifier(pc[3].u.operand);
ResolveType type = static_cast<ResolveType>(pc[4].u.operand);
RELEASE_ASSERT(type != LocalClosureVar);
int localScopeDepth = pc[5].u.operand;
ResolveOp op = JSScope::abstractResolve(m_globalObject->globalExec(), localScopeDepth, scope, ident, Get, type, InitializationMode::NotInitialization);
instructions[i + 4].u.operand = op.type;
instructions[i + 5].u.operand = op.depth;
if (op.lexicalEnvironment) {
if (op.type == ModuleVar) {
// Keep the linked module environment strongly referenced.
if (stronglyReferencedModuleEnvironments.add(jsCast<JSModuleEnvironment*>(op.lexicalEnvironment)).isNewEntry)
addConstant(op.lexicalEnvironment);
instructions[i + 6].u.jsCell.set(vm, this, op.lexicalEnvironment);
} else
instructions[i + 6].u.symbolTable.set(vm, this, op.lexicalEnvironment->symbolTable());
} else if (JSScope* constantScope = JSScope::constantScopeForCodeBlock(op.type, this))
instructions[i + 6].u.jsCell.set(vm, this, constantScope);
else
instructions[i + 6].u.pointer = nullptr;
break;
}
case op_get_from_scope: {
linkValueProfile(i, opLength);
// get_from_scope dst, scope, id, GetPutInfo, Structure, Operand
int localScopeDepth = pc[5].u.operand;
instructions[i + 5].u.pointer = nullptr;
GetPutInfo getPutInfo = GetPutInfo(pc[4].u.operand);
ASSERT(!isInitialization(getPutInfo.initializationMode()));
if (getPutInfo.resolveType() == LocalClosureVar) {
instructions[i + 4] = GetPutInfo(getPutInfo.resolveMode(), ClosureVar, getPutInfo.initializationMode()).operand();
break;
}
const Identifier& ident = identifier(pc[3].u.operand);
ResolveOp op = JSScope::abstractResolve(m_globalObject->globalExec(), localScopeDepth, scope, ident, Get, getPutInfo.resolveType(), InitializationMode::NotInitialization);
instructions[i + 4].u.operand = GetPutInfo(getPutInfo.resolveMode(), op.type, getPutInfo.initializationMode()).operand();
if (op.type == ModuleVar)
instructions[i + 4].u.operand = GetPutInfo(getPutInfo.resolveMode(), ClosureVar, getPutInfo.initializationMode()).operand();
if (op.type == GlobalVar || op.type == GlobalVarWithVarInjectionChecks || op.type == GlobalLexicalVar || op.type == GlobalLexicalVarWithVarInjectionChecks)
instructions[i + 5].u.watchpointSet = op.watchpointSet;
else if (op.structure)
instructions[i + 5].u.structure.set(vm, this, op.structure);
instructions[i + 6].u.pointer = reinterpret_cast<void*>(op.operand);
break;
}
case op_put_to_scope: {
// put_to_scope scope, id, value, GetPutInfo, Structure, Operand
GetPutInfo getPutInfo = GetPutInfo(pc[4].u.operand);
if (getPutInfo.resolveType() == LocalClosureVar) {
// Only do watching if the property we're putting to is not anonymous.
if (static_cast<unsigned>(pc[2].u.operand) != UINT_MAX) {
int symbolTableIndex = pc[5].u.operand;
SymbolTable* symbolTable = jsCast<SymbolTable*>(getConstant(symbolTableIndex));
const Identifier& ident = identifier(pc[2].u.operand);
ConcurrentJSLocker locker(symbolTable->m_lock);
auto iter = symbolTable->find(locker, ident.impl());
ASSERT(iter != symbolTable->end(locker));
iter->value.prepareToWatch();
instructions[i + 5].u.watchpointSet = iter->value.watchpointSet();
} else
instructions[i + 5].u.watchpointSet = nullptr;
break;
}
const Identifier& ident = identifier(pc[2].u.operand);
int localScopeDepth = pc[5].u.operand;
instructions[i + 5].u.pointer = nullptr;
ResolveOp op = JSScope::abstractResolve(m_globalObject->globalExec(), localScopeDepth, scope, ident, Put, getPutInfo.resolveType(), getPutInfo.initializationMode());
instructions[i + 4].u.operand = GetPutInfo(getPutInfo.resolveMode(), op.type, getPutInfo.initializationMode()).operand();
if (op.type == GlobalVar || op.type == GlobalVarWithVarInjectionChecks || op.type == GlobalLexicalVar || op.type == GlobalLexicalVarWithVarInjectionChecks)
instructions[i + 5].u.watchpointSet = op.watchpointSet;
else if (op.type == ClosureVar || op.type == ClosureVarWithVarInjectionChecks) {
if (op.watchpointSet)
op.watchpointSet->invalidate(vm, PutToScopeFireDetail(this, ident));
} else if (op.structure)
instructions[i + 5].u.structure.set(vm, this, op.structure);
instructions[i + 6].u.pointer = reinterpret_cast<void*>(op.operand);
break;
}
case op_profile_type: {
RELEASE_ASSERT(vm.typeProfiler());
// The format of this instruction is: op_profile_type regToProfile, TypeLocation*, flag, identifier?, resolveType?
size_t instructionOffset = i + opLength - 1;
unsigned divotStart, divotEnd;
GlobalVariableID globalVariableID = 0;
RefPtr<TypeSet> globalTypeSet;
bool shouldAnalyze = m_unlinkedCode->typeProfilerExpressionInfoForBytecodeOffset(instructionOffset, divotStart, divotEnd);
VirtualRegister profileRegister(pc[1].u.operand);
ProfileTypeBytecodeFlag flag = static_cast<ProfileTypeBytecodeFlag>(pc[3].u.operand);
SymbolTable* symbolTable = nullptr;
switch (flag) {
case ProfileTypeBytecodeClosureVar: {
const Identifier& ident = identifier(pc[4].u.operand);
int localScopeDepth = pc[2].u.operand;
ResolveType type = static_cast<ResolveType>(pc[5].u.operand);
// Even though type profiling may be profiling either a Get or a Put, we can always claim a Get because
// we're abstractly "read"ing from a JSScope.
ResolveOp op = JSScope::abstractResolve(m_globalObject->globalExec(), localScopeDepth, scope, ident, Get, type, InitializationMode::NotInitialization);
if (op.type == ClosureVar || op.type == ModuleVar)
symbolTable = op.lexicalEnvironment->symbolTable();
else if (op.type == GlobalVar)
symbolTable = m_globalObject.get()->symbolTable();
UniquedStringImpl* impl = (op.type == ModuleVar) ? op.importedName.get() : ident.impl();
if (symbolTable) {
ConcurrentJSLocker locker(symbolTable->m_lock);
// If our parent scope was created while profiling was disabled, it will not have prepared for profiling yet.
symbolTable->prepareForTypeProfiling(locker);
globalVariableID = symbolTable->uniqueIDForVariable(locker, impl, vm);
globalTypeSet = symbolTable->globalTypeSetForVariable(locker, impl, vm);
} else
globalVariableID = TypeProfilerNoGlobalIDExists;
break;
}
case ProfileTypeBytecodeLocallyResolved: {
int symbolTableIndex = pc[2].u.operand;
SymbolTable* symbolTable = jsCast<SymbolTable*>(getConstant(symbolTableIndex));
const Identifier& ident = identifier(pc[4].u.operand);
ConcurrentJSLocker locker(symbolTable->m_lock);
// If our parent scope was created while profiling was disabled, it will not have prepared for profiling yet.
globalVariableID = symbolTable->uniqueIDForVariable(locker, ident.impl(), vm);
globalTypeSet = symbolTable->globalTypeSetForVariable(locker, ident.impl(), vm);
break;
}
case ProfileTypeBytecodeDoesNotHaveGlobalID:
case ProfileTypeBytecodeFunctionArgument: {
globalVariableID = TypeProfilerNoGlobalIDExists;
break;
}
case ProfileTypeBytecodeFunctionReturnStatement: {
RELEASE_ASSERT(ownerExecutable->isFunctionExecutable());
globalTypeSet = jsCast<FunctionExecutable*>(ownerExecutable)->returnStatementTypeSet();
globalVariableID = TypeProfilerReturnStatement;
if (!shouldAnalyze) {
// Because a return statement can be added implicitly to return undefined at the end of a function,
// and these nodes don't emit expression ranges because they aren't in the actual source text of
// the user's program, give the type profiler some range to identify these return statements.
// Currently, the text offset that is used as identification is "f" in the function keyword
// and is stored on TypeLocation's m_divotForFunctionOffsetIfReturnStatement member variable.
divotStart = divotEnd = ownerExecutable->typeProfilingStartOffset();
shouldAnalyze = true;
}
break;
}
}
std::pair<TypeLocation*, bool> locationPair = vm.typeProfiler()->typeLocationCache()->getTypeLocation(globalVariableID,
ownerExecutable->sourceID(), divotStart, divotEnd, WTFMove(globalTypeSet), &vm);
TypeLocation* location = locationPair.first;
bool isNewLocation = locationPair.second;
if (flag == ProfileTypeBytecodeFunctionReturnStatement)
location->m_divotForFunctionOffsetIfReturnStatement = ownerExecutable->typeProfilingStartOffset();
if (shouldAnalyze && isNewLocation)
vm.typeProfiler()->insertNewLocation(location);
instructions[i + 2].u.location = location;
break;
}
case op_debug: {
if (pc[1].u.unsignedValue == DidReachBreakpoint)
m_hasDebuggerStatement = true;
break;
}
case op_create_rest: {
int numberOfArgumentsToSkip = instructions[i + 3].u.operand;
ASSERT_UNUSED(numberOfArgumentsToSkip, numberOfArgumentsToSkip >= 0);
// This is used when rematerializing the rest parameter during OSR exit in the FTL JIT.");
m_numberOfArgumentsToSkip = numberOfArgumentsToSkip;
break;
}
default:
break;
}
i += opLength;
}
if (vm.controlFlowProfiler())
insertBasicBlockBoundariesForControlFlowProfiler(instructions);
m_instructions = WTFMove(instructions);
// Set optimization thresholds only after m_instructions is initialized, since these
// rely on the instruction count (and are in theory permitted to also inspect the
// instruction stream to more accurate assess the cost of tier-up).
optimizeAfterWarmUp();
jitAfterWarmUp();
// If the concurrent thread will want the code block's hash, then compute it here
// synchronously.
if (Options::alwaysComputeHash())
hash();
if (Options::dumpGeneratedBytecodes())
dumpBytecode();
heap()->m_codeBlocks->add(this);
heap()->reportExtraMemoryAllocated(m_instructions.size() * sizeof(Instruction));
return true;
}
CodeBlock::~CodeBlock()
{
if (UNLIKELY(m_vm->m_perBytecodeProfiler))
m_vm->m_perBytecodeProfiler->notifyDestruction(this);
if (unlinkedCodeBlock()->didOptimize() == MixedTriState)
unlinkedCodeBlock()->setDidOptimize(FalseTriState);
#if ENABLE(VERBOSE_VALUE_PROFILE)
dumpValueProfiles();
#endif
// We may be destroyed before any CodeBlocks that refer to us are destroyed.
// Consider that two CodeBlocks become unreachable at the same time. There
// is no guarantee about the order in which the CodeBlocks are destroyed.
// So, if we don't remove incoming calls, and get destroyed before the
// CodeBlock(s) that have calls into us, then the CallLinkInfo vector's
// destructor will try to remove nodes from our (no longer valid) linked list.
unlinkIncomingCalls();
// Note that our outgoing calls will be removed from other CodeBlocks'
// m_incomingCalls linked lists through the execution of the ~CallLinkInfo
// destructors.
#if ENABLE(JIT)
for (Bag<StructureStubInfo>::iterator iter = m_stubInfos.begin(); !!iter; ++iter) {
StructureStubInfo* stub = *iter;
stub->aboutToDie();
stub->deref();
}
#endif // ENABLE(JIT)
}
void CodeBlock::setConstantIdentifierSetRegisters(VM& vm, const Vector<ConstantIndentifierSetEntry>& constants)
{
auto scope = DECLARE_THROW_SCOPE(vm);
JSGlobalObject* globalObject = m_globalObject.get();
ExecState* exec = globalObject->globalExec();
for (const auto& entry : constants) {
const IdentifierSet& set = entry.first;
Structure* setStructure = globalObject->setStructure();
RETURN_IF_EXCEPTION(scope, void());
JSSet* jsSet = JSSet::create(exec, vm, setStructure, set.size());
RETURN_IF_EXCEPTION(scope, void());
for (auto setEntry : set) {
JSString* jsString = jsOwnedString(&vm, setEntry.get());
jsSet->add(exec, jsString);
RETURN_IF_EXCEPTION(scope, void());
}
m_constantRegisters[entry.second].set(vm, this, jsSet);
}
}
void CodeBlock::setConstantRegisters(const Vector<WriteBarrier<Unknown>>& constants, const Vector<SourceCodeRepresentation>& constantsSourceCodeRepresentation)
{
auto scope = DECLARE_THROW_SCOPE(*m_vm);
JSGlobalObject* globalObject = m_globalObject.get();
ExecState* exec = globalObject->globalExec();
ASSERT(constants.size() == constantsSourceCodeRepresentation.size());
size_t count = constants.size();
m_constantRegisters.resizeToFit(count);
bool hasTypeProfiler = !!m_vm->typeProfiler();
for (size_t i = 0; i < count; i++) {
JSValue constant = constants[i].get();
if (!constant.isEmpty()) {
if (SymbolTable* symbolTable = jsDynamicCast<SymbolTable*>(*m_vm, constant)) {
if (hasTypeProfiler) {
ConcurrentJSLocker locker(symbolTable->m_lock);
symbolTable->prepareForTypeProfiling(locker);
}
SymbolTable* clone = symbolTable->cloneScopePart(*m_vm);
if (wasCompiledWithDebuggingOpcodes())
clone->setRareDataCodeBlock(this);
constant = clone;
} else if (isTemplateRegistryKey(*m_vm, constant)) {
auto* templateObject = globalObject->templateRegistry().getTemplateObject(exec, jsCast<JSTemplateRegistryKey*>(constant));
RETURN_IF_EXCEPTION(scope, void());
constant = templateObject;
}
}
m_constantRegisters[i].set(*m_vm, this, constant);
}
m_constantsSourceCodeRepresentation = constantsSourceCodeRepresentation;
}
void CodeBlock::setAlternative(VM& vm, CodeBlock* alternative)
{
m_alternative.set(vm, this, alternative);
}
void CodeBlock::setNumParameters(int newValue)
{
m_numParameters = newValue;
m_argumentValueProfiles = RefCountedArray<ValueProfile>(newValue);
}
CodeBlock* CodeBlock::specialOSREntryBlockOrNull()
{
#if ENABLE(FTL_JIT)
if (jitType() != JITCode::DFGJIT)
return 0;
DFG::JITCode* jitCode = m_jitCode->dfg();
return jitCode->osrEntryBlock();
#else // ENABLE(FTL_JIT)
return 0;
#endif // ENABLE(FTL_JIT)
}
void CodeBlock::visitWeakly(SlotVisitor& visitor)
{
ConcurrentJSLocker locker(m_lock);
if (m_visitWeaklyHasBeenCalled)
return;
m_visitWeaklyHasBeenCalled = true;
if (Heap::isMarkedConcurrently(this))
return;
if (shouldVisitStrongly(locker)) {
visitor.appendUnbarriered(this);
return;
}
// There are two things that may use unconditional finalizers: inline cache clearing
// and jettisoning. The probability of us wanting to do at least one of those things
// is probably quite close to 1. So we add one no matter what and when it runs, it
// figures out whether it has any work to do.
visitor.addUnconditionalFinalizer(&m_unconditionalFinalizer);
if (!JITCode::isOptimizingJIT(jitType()))
return;
// If we jettison ourselves we'll install our alternative, so make sure that it
// survives GC even if we don't.
visitor.append(m_alternative);
// There are two things that we use weak reference harvesters for: DFG fixpoint for
// jettisoning, and trying to find structures that would be live based on some
// inline cache. So it makes sense to register them regardless.
visitor.addWeakReferenceHarvester(&m_weakReferenceHarvester);
#if ENABLE(DFG_JIT)
// We get here if we're live in the sense that our owner executable is live,
// but we're not yet live for sure in another sense: we may yet decide that this
// code block should be jettisoned based on its outgoing weak references being
// stale. Set a flag to indicate that we're still assuming that we're dead, and
// perform one round of determining if we're live. The GC may determine, based on
// either us marking additional objects, or by other objects being marked for
// other reasons, that this iteration should run again; it will notify us of this
// decision by calling harvestWeakReferences().