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CodeBlock.cpp
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/*
* Copyright (C) 2008-2024 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 "BytecodeLivenessAnalysisInlines.h"
#include "BytecodeOperandsForCheckpoint.h"
#include "BytecodeStructs.h"
#include "CodeBlockInlines.h"
#include "CodeBlockSet.h"
#include "ControlFlowProfiler.h"
#include "DFGCapabilities.h"
#include "DFGCommon.h"
#include "DFGJITCode.h"
#include "EvalCodeBlock.h"
#include "FullCodeOrigin.h"
#include "FunctionCodeBlock.h"
#include "FunctionExecutableDump.h"
#include "GetPutInfo.h"
#include "InlineCallFrame.h"
#include "Instruction.h"
#include "InstructionStream.h"
#include "IsoCellSetInlines.h"
#include "JIT.h"
#include "JITMathIC.h"
#include "JITWorklist.h"
#include "JSCInlines.h"
#include "JSCJSValue.h"
#include "JSLexicalEnvironment.h"
#include "JSModuleEnvironment.h"
#include "JSSet.h"
#include "JSString.h"
#include "JSTemplateObjectDescriptor.h"
#include "LLIntData.h"
#include "LLIntEntrypoint.h"
#include "LLIntExceptions.h"
#include "LLIntPrototypeLoadAdaptiveStructureWatchpoint.h"
#include "MetadataTable.h"
#include "ModuleProgramCodeBlock.h"
#include "ObjectAllocationProfileInlines.h"
#include "PCToCodeOriginMap.h"
#include "ProfilerDatabase.h"
#include "ProgramCodeBlock.h"
#include "ReduceWhitespace.h"
#include "SlotVisitorInlines.h"
#include "StackVisitor.h"
#include "StructureStubInfo.h"
#include "TypeLocationCache.h"
#include "TypeProfiler.h"
#include "VMInlines.h"
#include <wtf/Forward.h>
#include <wtf/SimpleStats.h>
#include <wtf/StringPrintStream.h>
#include <wtf/text/UniquedStringImpl.h>
#if ENABLE(ASSEMBLER)
#include "RegisterAtOffsetList.h"
#endif
#if ENABLE(FTL_JIT)
#include "FTLJITCode.h"
#endif
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
namespace JSC {
DEFINE_ALLOCATOR_WITH_HEAP_IDENTIFIER(CodeBlockRareData);
const ClassInfo CodeBlock::s_info = {
"CodeBlock"_s, nullptr, nullptr, nullptr,
CREATE_METHOD_TABLE(CodeBlock)
};
CString CodeBlock::inferredName() const
{
switch (codeType()) {
case GlobalCode:
return "<global>"_span;
case EvalCode:
return "<eval>"_span;
case FunctionCode:
return jsCast<FunctionExecutable*>(ownerExecutable())->ecmaName().utf8();
case ModuleCode:
return "<module>"_span;
default:
CRASH();
return ""_span;
}
}
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(ownerExecutable()->source(), specializationKind());
}
return m_hash;
}
CString CodeBlock::sourceCodeForTools() const
{
if (codeType() != FunctionCode)
return ownerExecutable()->source().toUTF8();
FunctionExecutable* executable = jsCast<FunctionExecutable*>(ownerExecutable());
return executable->source().provider()->getRange(
executable->functionStart(),
executable->parametersStartOffset() + executable->source().length()).utf8();
}
CString CodeBlock::sourceCodeOnOneLine() const
{
return reduceWhitespace(sourceCodeForTools());
}
CString CodeBlock::hashAsStringIfPossible() const
{
if (hasHash() || isSafeToComputeHash())
return toCString(hash());
return "<no-hash>"_s;
}
void CodeBlock::dumpAssumingJITType(PrintStream& out, 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(", ", instructionsSize());
if (this->jitType() == JITType::BaselineJIT && m_shouldAlwaysBeInlined)
out.print(" (ShouldAlwaysBeInlined)");
if (ownerExecutable()->neverInline())
out.print(" (NeverInline)");
if (ownerExecutable()->neverOptimize())
out.print(" (NeverOptimize)");
else if (ownerExecutable()->neverFTLOptimize())
out.print(" (NeverFTLOptimize)");
if (ownerExecutable()->didTryToEnterInLoop())
out.print(" (DidTryToEnterInLoop)");
if (ownerExecutable()->isInStrictContext())
out.print(" (StrictMode)");
if (m_didFailJITCompilation)
out.print(" (JITFail)");
if (this->jitType() == JITType::BaselineJIT && m_didFailFTLCompilation)
out.print(" (FTLFail)");
if (this->jitType() == JITType::BaselineJIT && m_hasBeenCompiledWithFTL)
out.print(" (HadFTLReplacement)");
out.print("]");
}
void CodeBlock::dump(PrintStream& out) const
{
dumpAssumingJITType(out, jitType());
}
void CodeBlock::dumpSimpleName(PrintStream& out) const
{
out.print(inferredName(), "#", hashAsStringIfPossible());
}
void CodeBlock::dumpSource()
{
dumpSource(WTF::dataFile());
}
void CodeBlock::dumpSource(PrintStream& out)
{
ScriptExecutable* executable = ownerExecutable();
if (executable->isFunctionExecutable()) {
auto functionExecutable = static_cast<FunctionExecutable*>(executable);
StringView source = functionExecutable->source().provider()->getRange(
functionExecutable->parametersStartOffset(),
functionExecutable->functionEnd() + 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)
{
ICStatusMap statusMap;
getICStatusMap(statusMap);
BytecodeGraph graph(this, this->instructions());
CodeBlockBytecodeDumper<CodeBlock>::dumpGraph(this, instructions(), graph, out, statusMap);
}
void CodeBlock::dumpBytecode(PrintStream& out, const JSInstructionStream::Ref& it, const ICStatusMap& statusMap)
{
BytecodeDumper<CodeBlock>::dumpBytecode(this, out, it, statusMap);
}
void CodeBlock::dumpBytecode(PrintStream& out, unsigned bytecodeOffset, const ICStatusMap& statusMap)
{
const auto it = instructions().at(bytecodeOffset);
dumpBytecode(out, it, statusMap);
}
namespace {
class PutToScopeFireDetail final : public FireDetail {
public:
PutToScopeFireDetail(CodeBlock* codeBlock, const Identifier& ident)
: m_codeBlock(codeBlock)
, m_ident(ident)
{
}
void dump(PrintStream& out) const final
{
out.print("Linking put_to_scope in ", FunctionExecutableDump(jsCast<FunctionExecutable*>(m_codeBlock->ownerExecutable())), " for ", m_ident);
}
private:
CodeBlock* const 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_shouldAlwaysBeInlined(true)
#if ENABLE(JIT)
, m_capabilityLevelState(DFG::CapabilityLevelNotSet)
#endif
, m_didFailJITCompilation(false)
, m_didFailFTLCompilation(false)
, m_hasBeenCompiledWithFTL(false)
, m_isJettisoned(false)
, m_numCalleeLocals(other.m_numCalleeLocals)
, m_numVars(other.m_numVars)
, m_numberOfArgumentsToSkip(other.m_numberOfArgumentsToSkip)
, m_couldBeTainted(other.m_couldBeTainted)
, m_hasDebuggerStatement(false)
, m_steppingMode(SteppingModeDisabled)
, m_numBreakpoints(0)
, m_bytecodeCost(other.m_bytecodeCost)
, m_scopeRegister(other.m_scopeRegister)
, m_hash(other.m_hash)
, m_unlinkedCode(other.vm(), this, other.m_unlinkedCode.get())
, m_ownerExecutable(other.vm(), this, other.m_ownerExecutable.get())
, m_vm(other.m_vm)
, m_instructionsRawPointer(other.m_instructionsRawPointer)
, m_metadata(other.m_metadata)
, m_constantRegisters(other.m_constantRegisters)
, m_functionDecls(other.m_functionDecls)
, m_functionExprs(other.m_functionExprs)
, m_creationTime(ApproximateTime::now())
#if ASSERT_ENABLED
, m_magic(CODEBLOCK_MAGIC)
#endif
{
ASSERT(heap()->isDeferred());
ASSERT(m_scopeRegister.isLocal());
ASSERT(source().provider());
constexpr bool allocateArgumentValueProfiles = false;
setNumParameters(other.numParameters(), allocateArgumentValueProfiles);
ASSERT(m_couldBeTainted == (taintednessToTriState(source().provider()->sourceTaintedOrigin()) != TriState::False));
vm.heap.codeBlockSet().add(this);
}
void CodeBlock::finishCreation(VM& vm, CopyParsedBlockTag, CodeBlock& other)
{
Base::finishCreation(vm);
if (other.m_rareData) {
createRareDataIfNecessary();
m_rareData->m_exceptionHandlers = other.m_rareData->m_exceptionHandlers;
}
}
CodeBlock::CodeBlock(VM& vm, Structure* structure, ScriptExecutable* ownerExecutable, UnlinkedCodeBlock* unlinkedCodeBlock, JSScope* scope)
: JSCell(vm, structure)
, m_globalObject(scope->globalObject(), WriteBarrierEarlyInit)
, m_shouldAlwaysBeInlined(true)
#if ENABLE(JIT)
, m_capabilityLevelState(DFG::CapabilityLevelNotSet)
#endif
, m_didFailJITCompilation(false)
, m_didFailFTLCompilation(false)
, m_hasBeenCompiledWithFTL(false)
, m_isJettisoned(false)
, m_numCalleeLocals(unlinkedCodeBlock->numCalleeLocals())
, m_numVars(unlinkedCodeBlock->numVars())
, m_hasDebuggerStatement(false)
, m_steppingMode(SteppingModeDisabled)
, m_numBreakpoints(0)
, m_scopeRegister(unlinkedCodeBlock->scopeRegister())
, m_unlinkedCode(unlinkedCodeBlock, WriteBarrierEarlyInit)
, m_ownerExecutable(ownerExecutable, WriteBarrierEarlyInit)
, m_vm(&vm)
, m_instructionsRawPointer(unlinkedCodeBlock->instructions().rawPointer())
, m_metadata(unlinkedCodeBlock->metadata().link())
, m_creationTime(ApproximateTime::now())
#if ASSERT_ENABLED
, m_magic(CODEBLOCK_MAGIC)
#endif
{
ASSERT(heap()->isDeferred());
ASSERT(m_scopeRegister.isLocal());
ASSERT(source().provider());
constexpr bool allocateArgumentValueProfiles = true;
setNumParameters(unlinkedCodeBlock->numParameters(), allocateArgumentValueProfiles);
m_couldBeTainted = source().provider()->couldBeTainted();
vm.heap.codeBlockSet().add(this);
}
// The main purpose of this function is to generate linked bytecode from unlinked bytecode. The process
// of linking is taking an abstract representation of bytecode and tying it to a GlobalObject and scope
// chain. For example, this process allows us to cache the depth of lexical environment reads that reach
// outside of this CodeBlock's compilation unit. It also allows us to generate particular constants that
// we can't generate during unlinked bytecode generation. This process is not allowed to generate control
// flow or introduce new locals. The reason for this is we rely on liveness analysis to be the same for
// all the CodeBlocks of an UnlinkedCodeBlock. We rely on this fact by caching the liveness analysis
// inside UnlinkedCodeBlock. Also, Baseline JIT code is shared between all CodeBlocks of an UnlinkedCodeBlock,
// so the bytecode must remain the same between CodeBlocks sharing an UnlinkedCodeBlock.
bool CodeBlock::finishCreation(VM& vm, ScriptExecutable* ownerExecutable, UnlinkedCodeBlock* unlinkedCodeBlock,
JSScope* scope)
{
Base::finishCreation(vm);
ASSERT(vm.heap.isDeferred());
auto throwScope = DECLARE_THROW_SCOPE(vm);
if (m_unlinkedCode->wasCompiledWithTypeProfilerOpcodes() || m_unlinkedCode->wasCompiledWithControlFlowProfilerOpcodes())
vm.functionHasExecutedCache()->removeUnexecutedRange(ownerExecutable->sourceID(), ownerExecutable->typeProfilingStartOffset(), ownerExecutable->typeProfilingEndOffset());
ScriptExecutable* topLevelExecutable = ownerExecutable->topLevelExecutable();
// We wait to initialize template objects until the end of finishCreation beecause it can
// throw. We rely on linking to put the CodeBlock into a coherent state, so we can't throw
// until we're all done linking.
Vector<unsigned> templateObjectIndices = setConstantRegisters(unlinkedCodeBlock->constantRegisters(), unlinkedCodeBlock->constantsSourceCodeRepresentation());
// 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*>(unlinkedCodeBlock)) {
SymbolTable* clonedSymbolTable = jsCast<ModuleProgramExecutable*>(ownerExecutable)->moduleEnvironmentSymbolTable();
if (m_unlinkedCode->wasCompiledWithTypeProfilerOpcodes()) {
ConcurrentJSLocker locker(clonedSymbolTable->m_lock);
clonedSymbolTable->prepareForTypeProfiling(locker);
}
replaceConstant(VirtualRegister(unlinkedModuleProgramCodeBlock->moduleEnvironmentSymbolTableConstantRegisterOffset()), clonedSymbolTable);
}
bool shouldUpdateFunctionHasExecutedCache = m_unlinkedCode->wasCompiledWithTypeProfilerOpcodes() || m_unlinkedCode->wasCompiledWithControlFlowProfilerOpcodes();
m_functionDecls = FixedVector<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->unlinkedFunctionStart(), unlinkedExecutable->unlinkedFunctionEnd());
m_functionDecls[i].set(vm, this, unlinkedExecutable->link(vm, topLevelExecutable, ownerExecutable->source(), std::nullopt, NoIntrinsic, ownerExecutable->isInsideOrdinaryFunction()));
}
m_functionExprs = FixedVector<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->unlinkedFunctionStart(), unlinkedExecutable->unlinkedFunctionEnd());
m_functionExprs[i].set(vm, this, unlinkedExecutable->link(vm, topLevelExecutable, ownerExecutable->source(), std::nullopt, NoIntrinsic, ownerExecutable->isInsideOrdinaryFunction()));
}
if (unlinkedCodeBlock->numberOfExceptionHandlers()) {
createRareDataIfNecessary();
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)
auto& instruction = *instructions().at(unlinkedHandler.target).ptr();
handler.initialize(unlinkedHandler, CodeLocationLabel<ExceptionHandlerPtrTag>(LLInt::handleCatch(instruction.width()).code()));
#else
handler.initialize(unlinkedHandler);
#endif
}
}
}
// Bookkeep the strongly referenced module environments.
UncheckedKeyHashSet<JSModuleEnvironment*> stronglyReferencedModuleEnvironments;
auto link_objectAllocationProfile = [&](const auto& /*instruction*/, auto bytecode, auto& metadata) {
metadata.m_objectAllocationProfile.initializeProfile(vm, m_globalObject.get(), this, m_globalObject->objectPrototype(), bytecode.m_inlineCapacity);
};
auto link_arrayAllocationProfile = [&](const auto& /*instruction*/, auto bytecode, auto& metadata) {
metadata.m_arrayAllocationProfile.initializeIndexingMode(bytecode.m_recommendedIndexingType);
};
auto link_callLinkInfo = [&](const auto& instruction, auto bytecode, auto& metadata) {
metadata.m_callLinkInfo.initialize(vm, this, CallLinkInfo::callTypeFor(decltype(bytecode)::opcodeID), CodeOrigin { instruction.index() });
};
#define LINK_FIELD(__field) \
WTF_LAZY_JOIN(link_, __field)(instruction, bytecode, metadata);
#define INITIALIZE_METADATA(__op) \
auto bytecode = instruction->as<__op>(); \
auto& metadata = bytecode.metadata(this); \
new (&metadata) __op::Metadata { bytecode }; \
#define LINK_IMPL(...) \
INITIALIZE_METADATA(WTF_LAZY_FIRST(__VA_ARGS__)) \
WTF_LAZY_HAS_REST(__VA_ARGS__)({ \
WTF_LAZY_FOR_EACH_TERM(LINK_FIELD, WTF_LAZY_REST_(__VA_ARGS__)) \
}) \
#define CASE(__op) case __op::opcodeID
#define LINK(...) \
CASE(WTF_LAZY_FIRST(__VA_ARGS__)): { \
LINK_IMPL(__VA_ARGS__) \
break; \
}
const auto& instructionStream = instructions();
for (const auto& instruction : instructionStream) {
OpcodeID opcodeID = instruction->opcodeID();
static_assert(OpcodeIDWidthBySize<JSOpcodeTraits, OpcodeSize::Wide32>::opcodeIDSize == 1);
m_bytecodeCost += opcodeLengths[opcodeID] + 1;
switch (opcodeID) {
LINK(OpGetByVal)
LINK(OpGetPrivateName)
LINK(OpTryGetById)
LINK(OpGetByIdDirect)
LINK(OpGetByValWithThis)
LINK(OpToThis)
LINK(OpGetById)
LINK(OpGetLength)
LINK(OpEnumeratorNext)
LINK(OpEnumeratorInByVal)
LINK(OpEnumeratorHasOwnProperty)
LINK(OpEnumeratorGetByVal)
LINK(OpInByVal)
LINK(OpPutByVal)
LINK(OpPutByValDirect)
LINK(OpEnumeratorPutByVal)
LINK(OpPutPrivateName)
LINK(OpSetPrivateBrand)
LINK(OpCheckPrivateBrand)
LINK(OpNewArray)
LINK(OpNewArrayWithSize)
LINK(OpNewArrayBuffer, arrayAllocationProfile)
LINK(OpNewObject, objectAllocationProfile)
LINK(OpPutById)
LINK(OpCreateThis)
LINK(OpCreatePromise)
LINK(OpCreateGenerator)
LINK(OpJneqPtr)
LINK(OpCatch)
LINK(OpProfileControlFlow)
LINK(OpCall, callLinkInfo)
LINK(OpTailCall, callLinkInfo)
LINK(OpCallDirectEval, callLinkInfo)
LINK(OpConstruct, callLinkInfo)
LINK(OpSuperConstruct, callLinkInfo)
LINK(OpIteratorOpen, callLinkInfo)
LINK(OpIteratorNext, callLinkInfo)
LINK(OpCallVarargs, callLinkInfo)
LINK(OpTailCallVarargs, callLinkInfo)
LINK(OpTailCallForwardArguments, callLinkInfo)
LINK(OpConstructVarargs, callLinkInfo)
LINK(OpSuperConstructVarargs, callLinkInfo)
LINK(OpCallIgnoreResult, callLinkInfo)
case op_new_array_with_species: {
INITIALIZE_METADATA(OpNewArrayWithSpecies)
break;
}
case op_resolve_scope: {
INITIALIZE_METADATA(OpResolveScope)
const Identifier& ident = identifier(bytecode.m_var);
RELEASE_ASSERT(bytecode.m_resolveType != ResolvedClosureVar);
ResolveOp op = JSScope::abstractResolve(m_globalObject.get(), bytecode.m_localScopeDepth, scope, ident, Get, bytecode.m_resolveType, InitializationMode::NotInitialization);
metadata.m_resolveType = op.type;
metadata.m_localScopeDepth = 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(ConcurrentJSLocker(m_lock), op.lexicalEnvironment);
metadata.m_lexicalEnvironment.set(vm, this, op.lexicalEnvironment);
} else
metadata.m_symbolTable.set(vm, this, op.lexicalEnvironment->symbolTable());
} else if (JSScope* constantScope = JSScope::constantScopeForCodeBlock(op.type, this)) {
metadata.m_constantScope.set(vm, this, constantScope);
if (op.type == GlobalProperty || op.type == GlobalPropertyWithVarInjectionChecks)
metadata.m_globalLexicalBindingEpoch = m_globalObject->globalLexicalBindingEpoch();
} else
metadata.m_globalObject.clear();
break;
}
case op_get_from_scope: {
INITIALIZE_METADATA(OpGetFromScope)
metadata.m_watchpointSet = nullptr;
ASSERT(!isInitialization(bytecode.m_getPutInfo.initializationMode()));
if (bytecode.m_getPutInfo.resolveType() == ResolvedClosureVar) {
metadata.m_getPutInfo = GetPutInfo(bytecode.m_getPutInfo.resolveMode(), ClosureVar, bytecode.m_getPutInfo.initializationMode(), bytecode.m_getPutInfo.ecmaMode());
break;
}
const Identifier& ident = identifier(bytecode.m_var);
ResolveOp op = JSScope::abstractResolve(m_globalObject.get(), bytecode.m_localScopeDepth, scope, ident, Get, bytecode.m_getPutInfo.resolveType(), InitializationMode::NotInitialization);
metadata.m_getPutInfo = GetPutInfo(bytecode.m_getPutInfo.resolveMode(), op.type, bytecode.m_getPutInfo.initializationMode(), bytecode.m_getPutInfo.ecmaMode());
if (op.type == ModuleVar)
metadata.m_getPutInfo = GetPutInfo(bytecode.m_getPutInfo.resolveMode(), ClosureVar, bytecode.m_getPutInfo.initializationMode(), bytecode.m_getPutInfo.ecmaMode());
if (op.type == GlobalVar || op.type == GlobalVarWithVarInjectionChecks || op.type == GlobalLexicalVar || op.type == GlobalLexicalVarWithVarInjectionChecks)
metadata.m_watchpointSet = op.watchpointSet;
else if (op.structure)
metadata.m_structure.set(vm, this, op.structure);
metadata.m_operand = op.operand;
break;
}
case op_put_to_scope: {
INITIALIZE_METADATA(OpPutToScope)
if (bytecode.m_getPutInfo.resolveType() == ResolvedClosureVar) {
// Only do watching if the property we're putting to is not anonymous.
if (bytecode.m_var != UINT_MAX) {
SymbolTable* symbolTable = jsCast<SymbolTable*>(getConstant(bytecode.m_symbolTableOrScopeDepth.symbolTable()));
const Identifier& ident = identifier(bytecode.m_var);
ConcurrentJSLocker locker(symbolTable->m_lock);
auto iter = symbolTable->find(locker, ident.impl());
ASSERT(iter != symbolTable->end(locker));
if (bytecode.m_getPutInfo.initializationMode() == InitializationMode::ScopedArgumentInitialization) {
ASSERT(bytecode.m_value.isArgument());
unsigned argumentIndex = bytecode.m_value.toArgument() - 1;
symbolTable->prepareToWatchScopedArgument(iter->value, argumentIndex);
} else
iter->value.prepareToWatch();
metadata.m_watchpointSet = iter->value.watchpointSet();
} else
metadata.m_watchpointSet = nullptr;
break;
}
const Identifier& ident = identifier(bytecode.m_var);
metadata.m_watchpointSet = nullptr;
ResolveOp op = JSScope::abstractResolve(m_globalObject.get(), bytecode.m_symbolTableOrScopeDepth.scopeDepth(), scope, ident, Put, bytecode.m_getPutInfo.resolveType(), bytecode.m_getPutInfo.initializationMode());
metadata.m_getPutInfo = GetPutInfo(bytecode.m_getPutInfo.resolveMode(), op.type, bytecode.m_getPutInfo.initializationMode(), bytecode.m_getPutInfo.ecmaMode());
if (op.type == GlobalVar || op.type == GlobalVarWithVarInjectionChecks || op.type == GlobalLexicalVar || op.type == GlobalLexicalVarWithVarInjectionChecks)
metadata.m_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)
metadata.m_structure.set(vm, this, op.structure);
metadata.m_operand = op.operand;
break;
}
case op_profile_type: {
RELEASE_ASSERT(m_unlinkedCode->wasCompiledWithTypeProfilerOpcodes());
INITIALIZE_METADATA(OpProfileType)
size_t instructionOffset = instruction.offset() + instruction->size() - 1;
unsigned divotStart, divotEnd;
GlobalVariableID globalVariableID = 0;
RefPtr<TypeSet> globalTypeSet;
bool shouldAnalyze = m_unlinkedCode->typeProfilerExpressionInfoForBytecodeOffset(instructionOffset, divotStart, divotEnd);
SymbolTable* symbolTable = nullptr;
switch (bytecode.m_flag) {
case ProfileTypeBytecodeClosureVar: {
const Identifier& ident = identifier(bytecode.m_identifier);
unsigned localScopeDepth = bytecode.m_symbolTableOrScopeDepth.scopeDepth();
// 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.get(), localScopeDepth, scope, ident, Get, bytecode.m_resolveType, 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: {
SymbolTable* symbolTable = jsCast<SymbolTable*>(getConstant(bytecode.m_symbolTableOrScopeDepth.symbolTable()));
const Identifier& ident = identifier(bytecode.m_identifier);
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 (bytecode.m_flag == ProfileTypeBytecodeFunctionReturnStatement)
location->m_divotForFunctionOffsetIfReturnStatement = ownerExecutable->typeProfilingStartOffset();
if (shouldAnalyze && isNewLocation)
vm.typeProfiler()->insertNewLocation(location);
metadata.m_typeLocation = location;
break;
}
case op_debug: {
if (instruction->as<OpDebug>().m_debugHookType == DidReachDebuggerStatement)
m_hasDebuggerStatement = true;
break;
}
case op_create_rest: {
int numberOfArgumentsToSkip = instruction->as<OpCreateRest>().m_numParametersToSkip;
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;
}
}
#undef CASE
#undef INITIALIZE_METADATA
#undef LINK_FIELD
#undef LINK
if (m_unlinkedCode->wasCompiledWithControlFlowProfilerOpcodes())
insertBasicBlockBoundariesForControlFlowProfiler();
// If the concurrent thread will want the code block's hash, then compute it here
// synchronously.
if (Options::alwaysComputeHash())
hash();
if (Options::dumpGeneratedBytecodes())
dumpBytecode();
if (m_metadata)
vm.heap.reportExtraMemoryAllocated(this, m_metadata->sizeInBytesForGC());
initializeTemplateObjects(topLevelExecutable, templateObjectIndices);
RETURN_IF_EXCEPTION(throwScope, false);
return true;
}
#if ENABLE(JIT)
void CodeBlock::setupWithUnlinkedBaselineCode(Ref<BaselineJITCode> jitCode)
{
setJITCode(jitCode.copyRef());
{
const auto& jitCodeMap = this->jitCodeMap();
for (size_t i = 0; i < numberOfExceptionHandlers(); ++i) {
HandlerInfo& handler = exceptionHandler(i);
// FIXME: <rdar://problem/39433318>.
handler.nativeCode = jitCodeMap.find(BytecodeIndex(handler.target)).retagged<ExceptionHandlerPtrTag>();
}
}
{
ASSERT(!m_jitData);
auto baselineJITData = BaselineJITData::create(jitCode->m_unlinkedStubInfos.size(), jitCode->m_constantPool.size(), this);
for (unsigned index = 0; index < jitCode->m_unlinkedStubInfos.size(); ++index) {
BaselineUnlinkedStructureStubInfo& unlinkedStubInfo = jitCode->m_unlinkedStubInfos[index];
auto& stubInfo = baselineJITData->stubInfo(index);
stubInfo.initializeFromUnlinkedStructureStubInfo(vm(), this, unlinkedStubInfo);
}
for (size_t i = 0; i < jitCode->m_constantPool.size(); ++i) {
auto entry = jitCode->m_constantPool.at(i);
switch (entry.type()) {
case JITConstantPool::Type::FunctionDecl: {
unsigned index = std::bit_cast<uintptr_t>(entry.pointer());
baselineJITData->trailingSpan()[i] = functionDecl(index);
break;
}
case JITConstantPool::Type::FunctionExpr: {
unsigned index = std::bit_cast<uintptr_t>(entry.pointer());
baselineJITData->trailingSpan()[i] = functionExpr(index);
break;
}
}
}
setBaselineJITData(WTFMove(baselineJITData));
// Set optimization thresholds only after instructions is initialized and JITData 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).
// And the data is stored in JITData.
optimizeAfterWarmUp();
}
switch (codeType()) {
case GlobalCode:
case ModuleCode:
case EvalCode:
m_shouldAlwaysBeInlined = false;
break;
case FunctionCode:
// We could have already set it to false because we detected an uninlineable call.
// Don't override that observation.
m_shouldAlwaysBeInlined &= canInline(capabilityLevel()) && DFG::mightInlineFunction(JITType::FTLJIT, this);
break;
}
if (jitCode->m_isShareable && !unlinkedCodeBlock()->m_unlinkedBaselineCode && Options::useBaselineJITCodeSharing())
unlinkedCodeBlock()->m_unlinkedBaselineCode = WTFMove(jitCode);
}
#endif // ENABLE(JIT)
CodeBlock::~CodeBlock()
{
VM& vm = *m_vm;
if (JITCode::isBaselineCode(jitType())) {
if (m_metadata) {
m_metadata->forEach<OpCatch>([&](auto& metadata) {
if (metadata.m_buffer)
ValueProfileAndVirtualRegisterBuffer::destroy(std::exchange(metadata.m_buffer, nullptr));
});
}
}
#if ENABLE(DFG_JIT)
// The JITCode (and its corresponding DFG::CommonData) may outlive the CodeBlock by
// a short amount of time after the CodeBlock is destructed. For example, the
// Interpreter::execute methods will ref JITCode before invoking it. This can
// result in the JITCode having a non-zero refCount when its owner CodeBlock is
// destructed.
//
// Hence, we cannot rely on DFG::CommonData destruction to clear these now invalid
// watchpoints in a timely manner. We'll ensure they are cleared here eagerly.
//
// We only need to do this for a DFG/FTL CodeBlock because only these will have a
// DFG:CommonData. Hence, the LLInt and Baseline will not have any of these watchpoints.
//
// Note also that the LLIntPrototypeLoadAdaptiveStructureWatchpoint is also related
// to the CodeBlock. However, its lifecycle is tied directly to the CodeBlock, and
// will be automatically cleared when the CodeBlock destructs.
if (JSC::JITCode::isOptimizingJIT(jitType()))
jitCode()->dfgCommon()->clearWatchpoints();
#endif
if (UNLIKELY(vm.m_perBytecodeProfiler))
vm.m_perBytecodeProfiler->notifyDestruction(this);
if (LIKELY(!vm.heap.isShuttingDown())) {
// FIXME: This check should really not be necessary, see https://webkit.org/b/272787
ASSERT(!m_metadata || m_metadata->unlinkedMetadata());
if (m_metadata && !m_metadata->isDestroyed()) {
auto unlinkedMetadata = m_metadata->unlinkedMetadata();
if (unlinkedMetadata->didOptimize() == TriState::Indeterminate)
unlinkedMetadata->setDidOptimize(TriState::False);
}
}
#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.
unlinkOrUpgradeIncomingCalls(vm, nullptr);
// 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)
forEachStructureStubInfo([&](StructureStubInfo& stubInfo) {
stubInfo.aboutToDie();
stubInfo.deref();
return IterationStatus::Continue;
});
if (JSC::JITCode::isOptimizingJIT(jitType())) {
#if ENABLE(DFG_JIT)
if (auto* jitData = dfgJITData()) {
m_jitData = nullptr;
delete jitData;
}
#endif
} else {
if (auto* jitData = baselineJITData()) {
m_jitData = nullptr;
delete jitData;
}
}
#endif // ENABLE(JIT)
}
bool CodeBlock::isConstantOwnedByUnlinkedCodeBlock(VirtualRegister reg) const
{
// This needs to correspond to what we do inside setConstantRegisters.
switch (unlinkedCodeBlock()->constantSourceCodeRepresentation(reg)) {
case SourceCodeRepresentation::Integer:
case SourceCodeRepresentation::Double:
return true;
case SourceCodeRepresentation::Other: {
JSValue value = unlinkedCodeBlock()->getConstant(reg);
if (!value || !value.isCell())
return true;
JSCell* cell = value.asCell();
if (cell->inherits<SymbolTable>() || cell->inherits<JSTemplateObjectDescriptor>())
return false;
return true;
}
case SourceCodeRepresentation::LinkTimeConstant:
return false;
default:
RELEASE_ASSERT_NOT_REACHED();
}
}
Vector<unsigned> CodeBlock::setConstantRegisters(const FixedVector<WriteBarrier<Unknown>>& constants, const FixedVector<SourceCodeRepresentation>& constantsSourceCodeRepresentation)
{
VM& vm = *m_vm;
JSGlobalObject* globalObject = m_globalObject.get();
Vector<unsigned> templateObjectIndices;
ASSERT(constants.size() == constantsSourceCodeRepresentation.size());
size_t count = constants.size();
{
ConcurrentJSLocker locker(m_lock);
m_constantRegisters.resizeToFit(count);
}
for (size_t i = 0; i < count; i++) {
JSValue constant = constants[i].get();
SourceCodeRepresentation representation = constantsSourceCodeRepresentation[i];
switch (representation) {
case SourceCodeRepresentation::LinkTimeConstant:
constant = globalObject->linkTimeConstant(static_cast<LinkTimeConstant>(constant.asInt32AsAnyInt()));
ASSERT(constant.isCell()); // Unlinked Baseline JIT requires this.
break;
case SourceCodeRepresentation::Other:
case SourceCodeRepresentation::Integer:
case SourceCodeRepresentation::Double:
if (!constant.isEmpty()) {
if (constant.isCell()) {
JSCell* cell = constant.asCell();
if (SymbolTable* symbolTable = jsDynamicCast<SymbolTable*>(cell)) {
if (m_unlinkedCode->wasCompiledWithTypeProfilerOpcodes()) {
ConcurrentJSLocker locker(symbolTable->m_lock);
symbolTable->prepareForTypeProfiling(locker);
}
SymbolTable* clone = symbolTable->cloneScopePart(vm);
if (wasCompiledWithDebuggingOpcodes())
clone->setRareDataCodeBlock(this);
constant = clone;
} else if (jsDynamicCast<JSTemplateObjectDescriptor*>(cell))
templateObjectIndices.append(i);
}
}
break;
}
m_constantRegisters[i].set(vm, this, constant);
}
return templateObjectIndices;
}
void CodeBlock::initializeTemplateObjects(ScriptExecutable* topLevelExecutable, const Vector<unsigned>& templateObjectIndices)
{
auto scope = DECLARE_THROW_SCOPE(vm());
for (unsigned i : templateObjectIndices) {
auto* descriptor = jsCast<JSTemplateObjectDescriptor*>(m_constantRegisters[i].get());
auto* templateObject = topLevelExecutable->createTemplateObject(globalObject(), descriptor);
RETURN_IF_EXCEPTION(scope, void());
m_constantRegisters[i].set(vm(), this, templateObject);
}
}
void CodeBlock::setAlternative(VM& vm, CodeBlock* alternative)
{
RELEASE_ASSERT(alternative);
RELEASE_ASSERT(alternative->jitCode());
ASSERT(JITCode::isBaselineCode(alternative->jitType()) || alternative->jitType() == JITType::None);
m_alternative.set(vm, this, alternative);
}