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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.
*/
#include "config.h"
#include "CodeCache.h"
#include "BytecodeGenerator.h"
#include "IndirectEvalExecutable.h"
namespace JSC {
void CodeCacheMap::pruneSlowCase()
{
m_minCapacity = std::max(m_size - m_sizeAtLastPrune, static_cast<int64_t>(0));
m_sizeAtLastPrune = m_size;
m_timeAtLastPrune = MonotonicTime::now();
if (m_capacity < m_minCapacity)
m_capacity = m_minCapacity;
while (m_size > m_capacity || !canPruneQuickly()) {
MapType::iterator it = m_map.begin();
writeCodeBlock(it->value.cell->vm(), it->key, it->value);
m_size -= it->key.length();
m_map.remove(it);
}
}
static void generateUnlinkedCodeBlockForFunctions(VM& vm, UnlinkedCodeBlock* unlinkedCodeBlock, const SourceCode& parentSource, OptionSet<CodeGenerationMode> codeGenerationMode, ParserError& error)
{
auto generate = [&](UnlinkedFunctionExecutable* unlinkedExecutable, CodeSpecializationKind constructorKind) {
if (constructorKind == CodeForConstruct && SourceParseModeSet(SourceParseMode::AsyncArrowFunctionMode, SourceParseMode::AsyncMethodMode, SourceParseMode::AsyncFunctionMode).contains(unlinkedExecutable->parseMode()))
return;
SourceCode source = unlinkedExecutable->linkedSourceCode(parentSource);
UnlinkedFunctionCodeBlock* unlinkedFunctionCodeBlock = unlinkedExecutable->unlinkedCodeBlockFor(vm, source, constructorKind, codeGenerationMode, error, unlinkedExecutable->parseMode());
if (unlinkedFunctionCodeBlock)
generateUnlinkedCodeBlockForFunctions(vm, unlinkedFunctionCodeBlock, source, codeGenerationMode, error);
};
// FIXME: We should also generate CodeBlocks for CodeForConstruct
// https://bugs.webkit.org/show_bug.cgi?id=193823
for (unsigned i = 0; i < unlinkedCodeBlock->numberOfFunctionDecls(); i++)
generate(unlinkedCodeBlock->functionDecl(i), CodeForCall);
for (unsigned i = 0; i < unlinkedCodeBlock->numberOfFunctionExprs(); i++)
generate(unlinkedCodeBlock->functionExpr(i), CodeForCall);
}
template <class UnlinkedCodeBlockType, class ExecutableType = ScriptExecutable>
UnlinkedCodeBlockType* generateUnlinkedCodeBlockImpl(VM& vm, const SourceCode& source, JSParserStrictMode strictMode, JSParserScriptMode scriptMode, OptionSet<CodeGenerationMode> codeGenerationMode, ParserError& error, EvalContextType evalContextType, DerivedContextType derivedContextType, bool isArrowFunctionContext, const TDZEnvironment* variablesUnderTDZ = nullptr, const VariableEnvironment* parentScopePrivateNames = nullptr, ExecutableType* executable = nullptr)
{
typedef typename CacheTypes<UnlinkedCodeBlockType>::RootNode RootNode;
bool isInsideOrdinaryFunction = executable && executable->isInsideOrdinaryFunction();
std::unique_ptr<RootNode> rootNode = parse<RootNode>(
vm, source, Identifier(), JSParserBuiltinMode::NotBuiltin, strictMode, scriptMode, CacheTypes<UnlinkedCodeBlockType>::parseMode, SuperBinding::NotNeeded, error, nullptr, ConstructorKind::None, derivedContextType, evalContextType, nullptr, parentScopePrivateNames, nullptr, isInsideOrdinaryFunction);
if (!rootNode)
return nullptr;
unsigned lineCount = rootNode->lastLine() - rootNode->firstLine();
unsigned startColumn = rootNode->startColumn() + 1;
bool endColumnIsOnStartLine = !lineCount;
unsigned unlinkedEndColumn = rootNode->endColumn();
unsigned endColumn = unlinkedEndColumn + (endColumnIsOnStartLine ? startColumn : 1);
unsigned arrowContextFeature = isArrowFunctionContext ? ArrowFunctionContextFeature : 0;
if (executable)
executable->recordParse(rootNode->features() | arrowContextFeature, rootNode->hasCapturedVariables(), rootNode->lastLine(), endColumn);
bool usesEval = rootNode->features() & EvalFeature;
ECMAMode ecmaMode = rootNode->features() & StrictModeFeature ? ECMAMode::strict() : ECMAMode::sloppy();
NeedsClassFieldInitializer needsClassFieldInitializer = NeedsClassFieldInitializer::No;
if constexpr (std::is_same_v<ExecutableType, DirectEvalExecutable>)
needsClassFieldInitializer = executable->needsClassFieldInitializer();
ExecutableInfo executableInfo(usesEval, false, false, ConstructorKind::None, scriptMode, SuperBinding::NotNeeded, CacheTypes<UnlinkedCodeBlockType>::parseMode, derivedContextType, needsClassFieldInitializer, isArrowFunctionContext, false, evalContextType);
UnlinkedCodeBlockType* unlinkedCodeBlock = UnlinkedCodeBlockType::create(vm, executableInfo, codeGenerationMode);
unlinkedCodeBlock->recordParse(rootNode->features(), rootNode->hasCapturedVariables(), lineCount, unlinkedEndColumn);
if (!source.provider()->sourceURLDirective().isNull())
unlinkedCodeBlock->setSourceURLDirective(source.provider()->sourceURLDirective());
if (!source.provider()->sourceMappingURLDirective().isNull())
unlinkedCodeBlock->setSourceMappingURLDirective(source.provider()->sourceMappingURLDirective());
Vector<CompactTDZEnvironmentMap::Handle> parentVariablesUnderTDZ;
if (variablesUnderTDZ)
parentVariablesUnderTDZ.append(vm.m_compactVariableMap->get(*variablesUnderTDZ));
error = BytecodeGenerator::generate(vm, rootNode.get(), source, unlinkedCodeBlock, codeGenerationMode, parentVariablesUnderTDZ, ecmaMode);
if (error.isValid())
return nullptr;
return unlinkedCodeBlock;
}
template <class UnlinkedCodeBlockType, class ExecutableType>
UnlinkedCodeBlockType* generateUnlinkedCodeBlock(VM& vm, ExecutableType* executable, const SourceCode& source, JSParserStrictMode strictMode, JSParserScriptMode scriptMode, OptionSet<CodeGenerationMode> codeGenerationMode, ParserError& error, EvalContextType evalContextType, const TDZEnvironment* variablesUnderTDZ = nullptr, const VariableEnvironment* parentScopePrivateNames = nullptr)
{
return generateUnlinkedCodeBlockImpl<UnlinkedCodeBlockType, ExecutableType>(vm, source, strictMode, scriptMode, codeGenerationMode, error, evalContextType, executable->derivedContextType(), executable->isArrowFunctionContext(), variablesUnderTDZ, parentScopePrivateNames, executable);
}
UnlinkedEvalCodeBlock* generateUnlinkedCodeBlockForDirectEval(VM& vm, DirectEvalExecutable* executable, const SourceCode& source, JSParserStrictMode strictMode, JSParserScriptMode scriptMode, OptionSet<CodeGenerationMode> codeGenerationMode, ParserError& error, EvalContextType evalContextType, const TDZEnvironment* variablesUnderTDZ, const VariableEnvironment* parentScopePrivateNames)
{
return generateUnlinkedCodeBlock<UnlinkedEvalCodeBlock>(vm, executable, source, strictMode, scriptMode, codeGenerationMode, error, evalContextType, variablesUnderTDZ, parentScopePrivateNames);
}
template <class UnlinkedCodeBlockType>
std::enable_if_t<!std::is_same<UnlinkedCodeBlockType, UnlinkedEvalCodeBlock>::value, UnlinkedCodeBlockType*>
recursivelyGenerateUnlinkedCodeBlock(VM& vm, const SourceCode& source, JSParserStrictMode strictMode, JSParserScriptMode scriptMode, OptionSet<CodeGenerationMode> codeGenerationMode, ParserError& error, EvalContextType evalContextType)
{
bool isArrowFunctionContext = false;
UnlinkedCodeBlockType* unlinkedCodeBlock = generateUnlinkedCodeBlockImpl<UnlinkedCodeBlockType>(vm, source, strictMode, scriptMode, codeGenerationMode, error, evalContextType, DerivedContextType::None, isArrowFunctionContext);
if (!unlinkedCodeBlock)
return nullptr;
generateUnlinkedCodeBlockForFunctions(vm, unlinkedCodeBlock, source, codeGenerationMode, error);
return unlinkedCodeBlock;
}
UnlinkedProgramCodeBlock* recursivelyGenerateUnlinkedCodeBlockForProgram(VM& vm, const SourceCode& source, JSParserStrictMode strictMode, JSParserScriptMode scriptMode, OptionSet<CodeGenerationMode> codeGenerationMode, ParserError& error, EvalContextType evalContextType)
{
return recursivelyGenerateUnlinkedCodeBlock<UnlinkedProgramCodeBlock>(vm, source, strictMode, scriptMode, codeGenerationMode, error, evalContextType);
}
UnlinkedModuleProgramCodeBlock* recursivelyGenerateUnlinkedCodeBlockForModuleProgram(VM& vm, const SourceCode& source, JSParserStrictMode strictMode, JSParserScriptMode scriptMode, OptionSet<CodeGenerationMode> codeGenerationMode, ParserError& error, EvalContextType evalContextType)
{
return recursivelyGenerateUnlinkedCodeBlock<UnlinkedModuleProgramCodeBlock>(vm, source, strictMode, scriptMode, codeGenerationMode, error, evalContextType);
}
template <class UnlinkedCodeBlockType, class ExecutableType>
UnlinkedCodeBlockType* CodeCache::getUnlinkedGlobalCodeBlock(VM& vm, ExecutableType* executable, const SourceCode& source, JSParserStrictMode strictMode, JSParserScriptMode scriptMode, OptionSet<CodeGenerationMode> codeGenerationMode, ParserError& error, EvalContextType evalContextType)
{
DerivedContextType derivedContextType = executable->derivedContextType();
bool isArrowFunctionContext = executable->isArrowFunctionContext();
SourceCodeKey key(
source, String(), CacheTypes<UnlinkedCodeBlockType>::codeType, strictMode, scriptMode,
derivedContextType, evalContextType, isArrowFunctionContext, codeGenerationMode,
WTF::nullopt);
UnlinkedCodeBlockType* unlinkedCodeBlock = m_sourceCode.findCacheAndUpdateAge<UnlinkedCodeBlockType>(vm, key);
if (unlinkedCodeBlock && Options::useCodeCache()) {
unsigned lineCount = unlinkedCodeBlock->lineCount();
unsigned startColumn = unlinkedCodeBlock->startColumn() + source.startColumn().oneBasedInt();
bool endColumnIsOnStartLine = !lineCount;
unsigned endColumn = unlinkedCodeBlock->endColumn() + (endColumnIsOnStartLine ? startColumn : 1);
executable->recordParse(unlinkedCodeBlock->codeFeatures(), unlinkedCodeBlock->hasCapturedVariables(), source.firstLine().oneBasedInt() + lineCount, endColumn);
if (unlinkedCodeBlock->sourceURLDirective())
source.provider()->setSourceURLDirective(unlinkedCodeBlock->sourceURLDirective());
if (unlinkedCodeBlock->sourceMappingURLDirective())
source.provider()->setSourceMappingURLDirective(unlinkedCodeBlock->sourceMappingURLDirective());
return unlinkedCodeBlock;
}
unlinkedCodeBlock = generateUnlinkedCodeBlock<UnlinkedCodeBlockType, ExecutableType>(vm, executable, source, strictMode, scriptMode, codeGenerationMode, error, evalContextType);
if (unlinkedCodeBlock && Options::useCodeCache()) {
m_sourceCode.addCache(key, SourceCodeValue(vm, unlinkedCodeBlock, m_sourceCode.age()));
key.source().provider().cacheBytecode([&] {
return encodeCodeBlock(vm, key, unlinkedCodeBlock);
});
}
return unlinkedCodeBlock;
}
UnlinkedProgramCodeBlock* CodeCache::getUnlinkedProgramCodeBlock(VM& vm, ProgramExecutable* executable, const SourceCode& source, JSParserStrictMode strictMode, OptionSet<CodeGenerationMode> codeGenerationMode, ParserError& error)
{
return getUnlinkedGlobalCodeBlock<UnlinkedProgramCodeBlock>(vm, executable, source, strictMode, JSParserScriptMode::Classic, codeGenerationMode, error, EvalContextType::None);
}
UnlinkedEvalCodeBlock* CodeCache::getUnlinkedEvalCodeBlock(VM& vm, IndirectEvalExecutable* executable, const SourceCode& source, JSParserStrictMode strictMode, OptionSet<CodeGenerationMode> codeGenerationMode, ParserError& error, EvalContextType evalContextType)
{
return getUnlinkedGlobalCodeBlock<UnlinkedEvalCodeBlock>(vm, executable, source, strictMode, JSParserScriptMode::Classic, codeGenerationMode, error, evalContextType);
}
UnlinkedModuleProgramCodeBlock* CodeCache::getUnlinkedModuleProgramCodeBlock(VM& vm, ModuleProgramExecutable* executable, const SourceCode& source, OptionSet<CodeGenerationMode> codeGenerationMode, ParserError& error)
{
return getUnlinkedGlobalCodeBlock<UnlinkedModuleProgramCodeBlock>(vm, executable, source, JSParserStrictMode::Strict, JSParserScriptMode::Module, codeGenerationMode, error, EvalContextType::None);
}
UnlinkedFunctionExecutable* CodeCache::getUnlinkedGlobalFunctionExecutable(VM& vm, const Identifier& name, const SourceCode& source, OptionSet<CodeGenerationMode> codeGenerationMode, Optional<int> functionConstructorParametersEndPosition, ParserError& error)
{
bool isArrowFunctionContext = false;
SourceCodeKey key(
source, name.string(), SourceCodeType::FunctionType,
JSParserStrictMode::NotStrict,
JSParserScriptMode::Classic,
DerivedContextType::None,
EvalContextType::None,
isArrowFunctionContext,
codeGenerationMode,
functionConstructorParametersEndPosition);
UnlinkedFunctionExecutable* executable = m_sourceCode.findCacheAndUpdateAge<UnlinkedFunctionExecutable>(vm, key);
if (executable && Options::useCodeCache()) {
if (!executable->sourceURLDirective().isNull())
source.provider()->setSourceURLDirective(executable->sourceURLDirective());
if (!executable->sourceMappingURLDirective().isNull())
source.provider()->setSourceMappingURLDirective(executable->sourceMappingURLDirective());
return executable;
}
JSTextPosition positionBeforeLastNewline;
std::unique_ptr<ProgramNode> program = parseFunctionForFunctionConstructor(vm, source, error, &positionBeforeLastNewline, functionConstructorParametersEndPosition);
if (!program) {
RELEASE_ASSERT(error.isValid());
return nullptr;
}
// This function assumes an input string that would result in a single function declaration.
StatementNode* funcDecl = program->singleStatement();
if (UNLIKELY(!funcDecl)) {
JSToken token;
error = ParserError(ParserError::SyntaxError, ParserError::SyntaxErrorIrrecoverable, token, "Parser error", -1);
return nullptr;
}
ASSERT(funcDecl->isFuncDeclNode());
FunctionMetadataNode* metadata = static_cast<FuncDeclNode*>(funcDecl)->metadata();
ASSERT(metadata);
if (!metadata)
return nullptr;
metadata->overrideName(name);
metadata->setEndPosition(positionBeforeLastNewline);
// The Function constructor only has access to global variables, so no variables will be under TDZ unless they're
// in the global lexical environment, which we always TDZ check accesses from.
ConstructAbility constructAbility = constructAbilityForParseMode(metadata->parseMode());
UnlinkedFunctionExecutable* functionExecutable = UnlinkedFunctionExecutable::create(vm, source, metadata, UnlinkedNormalFunction, constructAbility, JSParserScriptMode::Classic, WTF::nullopt, DerivedContextType::None, NeedsClassFieldInitializer::No);
if (!source.provider()->sourceURLDirective().isNull())
functionExecutable->setSourceURLDirective(source.provider()->sourceURLDirective());
if (!source.provider()->sourceMappingURLDirective().isNull())
functionExecutable->setSourceMappingURLDirective(source.provider()->sourceMappingURLDirective());
if (Options::useCodeCache())
m_sourceCode.addCache(key, SourceCodeValue(vm, functionExecutable, m_sourceCode.age()));
return functionExecutable;
}
void CodeCache::updateCache(const UnlinkedFunctionExecutable* executable, const SourceCode& parentSource, CodeSpecializationKind kind, const UnlinkedFunctionCodeBlock* codeBlock)
{
parentSource.provider()->updateCache(executable, parentSource, kind, codeBlock);
}
void CodeCache::write(VM& vm)
{
for (auto& it : m_sourceCode)
writeCodeBlock(vm, it.key, it.value);
}
void writeCodeBlock(VM& vm, const SourceCodeKey& key, const SourceCodeValue& value)
{
UnlinkedCodeBlock* codeBlock = jsDynamicCast<UnlinkedCodeBlock*>(vm, value.cell.get());
if (!codeBlock)
return;
key.source().provider().commitCachedBytecode();
}
static SourceCodeKey sourceCodeKeyForSerializedBytecode(VM&, const SourceCode& sourceCode, SourceCodeType codeType, JSParserStrictMode strictMode, JSParserScriptMode scriptMode, OptionSet<CodeGenerationMode> codeGenerationMode)
{
return SourceCodeKey(
sourceCode, String(), codeType, strictMode, scriptMode,
DerivedContextType::None, EvalContextType::None, false, codeGenerationMode,
WTF::nullopt);
}
SourceCodeKey sourceCodeKeyForSerializedProgram(VM& vm, const SourceCode& sourceCode)
{
JSParserStrictMode strictMode = JSParserStrictMode::NotStrict;
JSParserScriptMode scriptMode = JSParserScriptMode::Classic;
return sourceCodeKeyForSerializedBytecode(vm, sourceCode, SourceCodeType::ProgramType, strictMode, scriptMode, { });
}
SourceCodeKey sourceCodeKeyForSerializedModule(VM& vm, const SourceCode& sourceCode)
{
JSParserStrictMode strictMode = JSParserStrictMode::Strict;
JSParserScriptMode scriptMode = JSParserScriptMode::Module;
return sourceCodeKeyForSerializedBytecode(vm, sourceCode, SourceCodeType::ModuleType, strictMode, scriptMode, { });
}
RefPtr<CachedBytecode> serializeBytecode(VM& vm, UnlinkedCodeBlock* codeBlock, const SourceCode& source, SourceCodeType codeType, JSParserStrictMode strictMode, JSParserScriptMode scriptMode, FileSystem::PlatformFileHandle fd, BytecodeCacheError& error, OptionSet<CodeGenerationMode> codeGenerationMode)
{
return encodeCodeBlock(vm,
sourceCodeKeyForSerializedBytecode(vm, source, codeType, strictMode, scriptMode, codeGenerationMode), codeBlock, fd, error);
}
}