Source/JavaScriptCore/bytecode/UnlinkedFunctionExecutable.cpp - third_party/webkit - Git at Google

 /*
  * Copyright (C) 2012-2013, 2015-2016 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 "UnlinkedFunctionExecutable.h"

 #include "BytecodeGenerator.h"
 #include "ClassInfo.h"
 #include "CodeCache.h"
 #include "Debugger.h"
 #include "Executable.h"
 #include "ExecutableInfo.h"
 #include "FunctionOverrides.h"
 #include "JSCInlines.h"
 #include "Parser.h"
 #include "SourceProvider.h"
 #include "Structure.h"

 namespace JSC {

 static_assert(sizeof(UnlinkedFunctionExecutable) <= 256, "UnlinkedFunctionExecutable should fit in a 256-byte cell.");

 const ClassInfo UnlinkedFunctionExecutable::s_info = { "UnlinkedFunctionExecutable", 0, 0, CREATE_METHOD_TABLE(UnlinkedFunctionExecutable) };

 static UnlinkedFunctionCodeBlock* generateUnlinkedFunctionCodeBlock(
     VM& vm, UnlinkedFunctionExecutable* executable, const SourceCode& source,
     CodeSpecializationKind kind, DebuggerMode debuggerMode,
     UnlinkedFunctionKind functionKind, ParserError& error, SourceParseMode parseMode)
 {
     JSParserBuiltinMode builtinMode = executable->isBuiltinFunction() ? JSParserBuiltinMode::Builtin : JSParserBuiltinMode::NotBuiltin;
     JSParserStrictMode strictMode = executable->isInStrictContext() ? JSParserStrictMode::Strict : JSParserStrictMode::NotStrict;
     JSParserScriptMode scriptMode = executable->scriptMode();
     ASSERT(isFunctionParseMode(executable->parseMode()));
     std::unique_ptr<FunctionNode> function = parse<FunctionNode>(
         &vm, source, executable->name(), builtinMode, strictMode, scriptMode, executable->parseMode(), executable->superBinding(), error, nullptr);

     if (!function) {
         ASSERT(error.isValid());
         return nullptr;
     }

     function->finishParsing(executable->name(), executable->functionMode());
     executable->recordParse(function->features(), function->hasCapturedVariables());

     bool isClassContext = executable->superBinding() == SuperBinding::Needed;

     UnlinkedFunctionCodeBlock* result = UnlinkedFunctionCodeBlock::create(&vm, FunctionCode, ExecutableInfo(function->usesEval(), function->isStrictMode(), kind == CodeForConstruct, functionKind == UnlinkedBuiltinFunction, executable->constructorKind(), scriptMode, executable->superBinding(), parseMode, executable->derivedContextType(), false, isClassContext, EvalContextType::FunctionEvalContext), debuggerMode);

     error = BytecodeGenerator::generate(vm, function.get(), result, debuggerMode, executable->parentScopeTDZVariables());

     if (error.isValid())
         return nullptr;
     return result;
 }

 UnlinkedFunctionExecutable::UnlinkedFunctionExecutable(VM* vm, Structure* structure, const SourceCode& source, RefPtr<SourceProvider>&& sourceOverride, FunctionMetadataNode* node, UnlinkedFunctionKind kind, ConstructAbility constructAbility, JSParserScriptMode scriptMode, VariableEnvironment& parentScopeTDZVariables, DerivedContextType derivedContextType)
     : Base(*vm, structure)
     , m_firstLineOffset(node->firstLine() - source.firstLine())
     , m_lineCount(node->lastLine() - node->firstLine())
     , m_unlinkedFunctionNameStart(node->functionNameStart() - source.startOffset())
     , m_unlinkedBodyStartColumn(node->startColumn())
     , m_unlinkedBodyEndColumn(m_lineCount ? node->endColumn() : node->endColumn() - node->startColumn())
     , m_startOffset(node->source().startOffset() - source.startOffset())
     , m_sourceLength(node->source().length())
     , m_parametersStartOffset(node->parametersStart())
     , m_typeProfilingStartOffset(node->functionKeywordStart())
     , m_typeProfilingEndOffset(node->startStartOffset() + node->source().length() - 1)
     , m_parameterCount(node->parameterCount())
     , m_functionLength(node->functionLength())
     , m_features(0)
     , m_sourceParseMode(node->parseMode())
     , m_isInStrictContext(node->isInStrictContext())
     , m_hasCapturedVariables(false)
     , m_isBuiltinFunction(kind == UnlinkedBuiltinFunction)
     , m_constructAbility(static_cast<unsigned>(constructAbility))
     , m_constructorKind(static_cast<unsigned>(node->constructorKind()))
     , m_functionMode(static_cast<unsigned>(node->functionMode()))
     , m_scriptMode(static_cast<unsigned>(scriptMode))
     , m_superBinding(static_cast<unsigned>(node->superBinding()))
     , m_derivedContextType(static_cast<unsigned>(derivedContextType))
     , m_name(node->ident())
     , m_ecmaName(node->ecmaName())
     , m_inferredName(node->inferredName())
     , m_sourceOverride(WTFMove(sourceOverride))
     , m_classSource(node->classSource())
 {
     // Make sure these bitfields are adequately wide.
     ASSERT(m_constructAbility == static_cast<unsigned>(constructAbility));
     ASSERT(m_constructorKind == static_cast<unsigned>(node->constructorKind()));
     ASSERT(m_functionMode == static_cast<unsigned>(node->functionMode()));
     ASSERT(m_scriptMode == static_cast<unsigned>(scriptMode));
     ASSERT(m_superBinding == static_cast<unsigned>(node->superBinding()));
     ASSERT(m_derivedContextType == static_cast<unsigned>(derivedContextType));

     m_parentScopeTDZVariables.swap(parentScopeTDZVariables);
 }

 void UnlinkedFunctionExecutable::visitChildren(JSCell* cell, SlotVisitor& visitor)
 {
     UnlinkedFunctionExecutable* thisObject = jsCast<UnlinkedFunctionExecutable*>(cell);
     ASSERT_GC_OBJECT_INHERITS(thisObject, info());
     Base::visitChildren(thisObject, visitor);
     visitor.append(&thisObject->m_unlinkedCodeBlockForCall);
     visitor.append(&thisObject->m_unlinkedCodeBlockForConstruct);
 }

 FunctionExecutable* UnlinkedFunctionExecutable::link(VM& vm, const SourceCode& ownerSource, Optional<int> overrideLineNumber, Intrinsic intrinsic)
 {
     SourceCode source = m_sourceOverride ? SourceCode(m_sourceOverride) : ownerSource;
     unsigned firstLine = source.firstLine() + m_firstLineOffset;
     unsigned startOffset = source.startOffset() + m_startOffset;
     unsigned lineCount = m_lineCount;

     // Adjust to one-based indexing.
     bool startColumnIsOnFirstSourceLine = !m_firstLineOffset;
     unsigned startColumn = m_unlinkedBodyStartColumn + (startColumnIsOnFirstSourceLine ? source.startColumn() : 1);
     bool endColumnIsOnStartLine = !lineCount;
     unsigned endColumn = m_unlinkedBodyEndColumn + (endColumnIsOnStartLine ? startColumn : 1);

     SourceCode code(source.provider(), startOffset, startOffset + m_sourceLength, firstLine, startColumn);
     FunctionOverrides::OverrideInfo overrideInfo;
     bool hasFunctionOverride = false;

     if (UNLIKELY(Options::functionOverrides())) {
         hasFunctionOverride = FunctionOverrides::initializeOverrideFor(code, overrideInfo);
         if (UNLIKELY(hasFunctionOverride)) {
             firstLine = overrideInfo.firstLine;
             lineCount = overrideInfo.lineCount;
             startColumn = overrideInfo.startColumn;
             endColumn = overrideInfo.endColumn;
             code = overrideInfo.sourceCode;
         }
     }

     FunctionExecutable* result = FunctionExecutable::create(vm, code, this, firstLine, firstLine + lineCount, startColumn, endColumn, intrinsic);
     if (overrideLineNumber)
         result->setOverrideLineNumber(*overrideLineNumber);

     if (UNLIKELY(hasFunctionOverride)) {
         result->overrideParameterAndTypeProfilingStartEndOffsets(
             overrideInfo.parametersStartOffset,
             overrideInfo.typeProfilingStartOffset,
             overrideInfo.typeProfilingEndOffset);
     }

     return result;
 }

 UnlinkedFunctionExecutable* UnlinkedFunctionExecutable::fromGlobalCode(
     const Identifier& name, ExecState& exec, const SourceCode& source,
     JSObject*& exception, int overrideLineNumber)
 {
     ParserError error;
     VM& vm = exec.vm();
     CodeCache* codeCache = vm.codeCache();
     UnlinkedFunctionExecutable* executable = codeCache->getFunctionExecutableFromGlobalCode(vm, name, source, error);

     auto& globalObject = *exec.lexicalGlobalObject();
     if (globalObject.hasDebugger())
         globalObject.debugger()->sourceParsed(&exec, source.provider(), error.line(), error.message());

     if (error.isValid()) {
         exception = error.toErrorObject(&globalObject, source, overrideLineNumber);
         return nullptr;
     }

     return executable;
 }

 UnlinkedFunctionCodeBlock* UnlinkedFunctionExecutable::unlinkedCodeBlockFor(
     VM& vm, const SourceCode& source, CodeSpecializationKind specializationKind,
     DebuggerMode debuggerMode, ParserError& error, SourceParseMode parseMode)
 {
     switch (specializationKind) {
     case CodeForCall:
         if (UnlinkedFunctionCodeBlock* codeBlock = m_unlinkedCodeBlockForCall.get())
             return codeBlock;
         break;
     case CodeForConstruct:
         if (UnlinkedFunctionCodeBlock* codeBlock = m_unlinkedCodeBlockForConstruct.get())
             return codeBlock;
         break;
     }

     UnlinkedFunctionCodeBlock* result = generateUnlinkedFunctionCodeBlock(
         vm, this, source, specializationKind, debuggerMode,
         isBuiltinFunction() ? UnlinkedBuiltinFunction : UnlinkedNormalFunction,
         error, parseMode);

     if (error.isValid())
         return nullptr;

     switch (specializationKind) {
     case CodeForCall:
         m_unlinkedCodeBlockForCall.set(vm, this, result);
         break;
     case CodeForConstruct:
         m_unlinkedCodeBlockForConstruct.set(vm, this, result);
         break;
     }
     return result;
 }

 void UnlinkedFunctionExecutable::setInvalidTypeProfilingOffsets()
 {
     m_typeProfilingStartOffset = std::numeric_limits<unsigned>::max();
     m_typeProfilingEndOffset = std::numeric_limits<unsigned>::max();
 }

 } // namespace JSC
	/*
	* Copyright (C) 2012-2013, 2015-2016 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 "UnlinkedFunctionExecutable.h"

	#include "BytecodeGenerator.h"
	#include "ClassInfo.h"
	#include "CodeCache.h"
	#include "Debugger.h"
	#include "Executable.h"
	#include "ExecutableInfo.h"
	#include "FunctionOverrides.h"
	#include "JSCInlines.h"
	#include "Parser.h"
	#include "SourceProvider.h"
	#include "Structure.h"

	namespace JSC {

	static_assert(sizeof(UnlinkedFunctionExecutable) <= 256, "UnlinkedFunctionExecutable should fit in a 256-byte cell.");

	const ClassInfo UnlinkedFunctionExecutable::s_info = { "UnlinkedFunctionExecutable", 0, 0, CREATE_METHOD_TABLE(UnlinkedFunctionExecutable) };

	static UnlinkedFunctionCodeBlock* generateUnlinkedFunctionCodeBlock(
	VM& vm, UnlinkedFunctionExecutable* executable, const SourceCode& source,
	CodeSpecializationKind kind, DebuggerMode debuggerMode,
	UnlinkedFunctionKind functionKind, ParserError& error, SourceParseMode parseMode)
	{
	JSParserBuiltinMode builtinMode = executable->isBuiltinFunction() ? JSParserBuiltinMode::Builtin : JSParserBuiltinMode::NotBuiltin;
	JSParserStrictMode strictMode = executable->isInStrictContext() ? JSParserStrictMode::Strict : JSParserStrictMode::NotStrict;
	JSParserScriptMode scriptMode = executable->scriptMode();
	ASSERT(isFunctionParseMode(executable->parseMode()));
	std::unique_ptr<FunctionNode> function = parse<FunctionNode>(
	&vm, source, executable->name(), builtinMode, strictMode, scriptMode, executable->parseMode(), executable->superBinding(), error, nullptr);

	if (!function) {
	ASSERT(error.isValid());
	return nullptr;
	}

	function->finishParsing(executable->name(), executable->functionMode());
	executable->recordParse(function->features(), function->hasCapturedVariables());

	bool isClassContext = executable->superBinding() == SuperBinding::Needed;

	UnlinkedFunctionCodeBlock* result = UnlinkedFunctionCodeBlock::create(&vm, FunctionCode, ExecutableInfo(function->usesEval(), function->isStrictMode(), kind == CodeForConstruct, functionKind == UnlinkedBuiltinFunction, executable->constructorKind(), scriptMode, executable->superBinding(), parseMode, executable->derivedContextType(), false, isClassContext, EvalContextType::FunctionEvalContext), debuggerMode);

	error = BytecodeGenerator::generate(vm, function.get(), result, debuggerMode, executable->parentScopeTDZVariables());

	if (error.isValid())
	return nullptr;
	return result;
	}

	UnlinkedFunctionExecutable::UnlinkedFunctionExecutable(VM* vm, Structure* structure, const SourceCode& source, RefPtr<SourceProvider>&& sourceOverride, FunctionMetadataNode* node, UnlinkedFunctionKind kind, ConstructAbility constructAbility, JSParserScriptMode scriptMode, VariableEnvironment& parentScopeTDZVariables, DerivedContextType derivedContextType)
	: Base(*vm, structure)
	, m_firstLineOffset(node->firstLine() - source.firstLine())
	, m_lineCount(node->lastLine() - node->firstLine())
	, m_unlinkedFunctionNameStart(node->functionNameStart() - source.startOffset())
	, m_unlinkedBodyStartColumn(node->startColumn())
	, m_unlinkedBodyEndColumn(m_lineCount ? node->endColumn() : node->endColumn() - node->startColumn())
	, m_startOffset(node->source().startOffset() - source.startOffset())
	, m_sourceLength(node->source().length())
	, m_parametersStartOffset(node->parametersStart())
	, m_typeProfilingStartOffset(node->functionKeywordStart())
	, m_typeProfilingEndOffset(node->startStartOffset() + node->source().length() - 1)
	, m_parameterCount(node->parameterCount())
	, m_functionLength(node->functionLength())
	, m_features(0)
	, m_sourceParseMode(node->parseMode())
	, m_isInStrictContext(node->isInStrictContext())
	, m_hasCapturedVariables(false)
	, m_isBuiltinFunction(kind == UnlinkedBuiltinFunction)
	, m_constructAbility(static_cast<unsigned>(constructAbility))
	, m_constructorKind(static_cast<unsigned>(node->constructorKind()))
	, m_functionMode(static_cast<unsigned>(node->functionMode()))
	, m_scriptMode(static_cast<unsigned>(scriptMode))
	, m_superBinding(static_cast<unsigned>(node->superBinding()))
	, m_derivedContextType(static_cast<unsigned>(derivedContextType))
	, m_name(node->ident())
	, m_ecmaName(node->ecmaName())
	, m_inferredName(node->inferredName())
	, m_sourceOverride(WTFMove(sourceOverride))
	, m_classSource(node->classSource())
	{
	// Make sure these bitfields are adequately wide.
	ASSERT(m_constructAbility == static_cast<unsigned>(constructAbility));
	ASSERT(m_constructorKind == static_cast<unsigned>(node->constructorKind()));
	ASSERT(m_functionMode == static_cast<unsigned>(node->functionMode()));
	ASSERT(m_scriptMode == static_cast<unsigned>(scriptMode));
	ASSERT(m_superBinding == static_cast<unsigned>(node->superBinding()));
	ASSERT(m_derivedContextType == static_cast<unsigned>(derivedContextType));

	m_parentScopeTDZVariables.swap(parentScopeTDZVariables);
	}

	void UnlinkedFunctionExecutable::visitChildren(JSCell* cell, SlotVisitor& visitor)
	{
	UnlinkedFunctionExecutable* thisObject = jsCast<UnlinkedFunctionExecutable*>(cell);
	ASSERT_GC_OBJECT_INHERITS(thisObject, info());
	Base::visitChildren(thisObject, visitor);
	visitor.append(&thisObject->m_unlinkedCodeBlockForCall);
	visitor.append(&thisObject->m_unlinkedCodeBlockForConstruct);
	}

	FunctionExecutable* UnlinkedFunctionExecutable::link(VM& vm, const SourceCode& ownerSource, Optional<int> overrideLineNumber, Intrinsic intrinsic)
	{
	SourceCode source = m_sourceOverride ? SourceCode(m_sourceOverride) : ownerSource;
	unsigned firstLine = source.firstLine() + m_firstLineOffset;
	unsigned startOffset = source.startOffset() + m_startOffset;
	unsigned lineCount = m_lineCount;

	// Adjust to one-based indexing.
	bool startColumnIsOnFirstSourceLine = !m_firstLineOffset;
	unsigned startColumn = m_unlinkedBodyStartColumn + (startColumnIsOnFirstSourceLine ? source.startColumn() : 1);
	bool endColumnIsOnStartLine = !lineCount;
	unsigned endColumn = m_unlinkedBodyEndColumn + (endColumnIsOnStartLine ? startColumn : 1);

	SourceCode code(source.provider(), startOffset, startOffset + m_sourceLength, firstLine, startColumn);
	FunctionOverrides::OverrideInfo overrideInfo;
	bool hasFunctionOverride = false;

	if (UNLIKELY(Options::functionOverrides())) {
	hasFunctionOverride = FunctionOverrides::initializeOverrideFor(code, overrideInfo);
	if (UNLIKELY(hasFunctionOverride)) {
	firstLine = overrideInfo.firstLine;
	lineCount = overrideInfo.lineCount;
	startColumn = overrideInfo.startColumn;
	endColumn = overrideInfo.endColumn;
	code = overrideInfo.sourceCode;
	}
	}

	FunctionExecutable* result = FunctionExecutable::create(vm, code, this, firstLine, firstLine + lineCount, startColumn, endColumn, intrinsic);
	if (overrideLineNumber)
	result->setOverrideLineNumber(*overrideLineNumber);

	if (UNLIKELY(hasFunctionOverride)) {
	result->overrideParameterAndTypeProfilingStartEndOffsets(
	overrideInfo.parametersStartOffset,
	overrideInfo.typeProfilingStartOffset,
	overrideInfo.typeProfilingEndOffset);
	}

	return result;
	}

	UnlinkedFunctionExecutable* UnlinkedFunctionExecutable::fromGlobalCode(
	const Identifier& name, ExecState& exec, const SourceCode& source,
	JSObject*& exception, int overrideLineNumber)
	{
	ParserError error;
	VM& vm = exec.vm();
	CodeCache* codeCache = vm.codeCache();
	UnlinkedFunctionExecutable* executable = codeCache->getFunctionExecutableFromGlobalCode(vm, name, source, error);

	auto& globalObject = *exec.lexicalGlobalObject();
	if (globalObject.hasDebugger())
	globalObject.debugger()->sourceParsed(&exec, source.provider(), error.line(), error.message());

	if (error.isValid()) {
	exception = error.toErrorObject(&globalObject, source, overrideLineNumber);
	return nullptr;
	}

	return executable;
	}

	UnlinkedFunctionCodeBlock* UnlinkedFunctionExecutable::unlinkedCodeBlockFor(
	VM& vm, const SourceCode& source, CodeSpecializationKind specializationKind,
	DebuggerMode debuggerMode, ParserError& error, SourceParseMode parseMode)
	{
	switch (specializationKind) {
	case CodeForCall:
	if (UnlinkedFunctionCodeBlock* codeBlock = m_unlinkedCodeBlockForCall.get())
	return codeBlock;
	break;
	case CodeForConstruct:
	if (UnlinkedFunctionCodeBlock* codeBlock = m_unlinkedCodeBlockForConstruct.get())
	return codeBlock;
	break;
	}

	UnlinkedFunctionCodeBlock* result = generateUnlinkedFunctionCodeBlock(
	vm, this, source, specializationKind, debuggerMode,
	isBuiltinFunction() ? UnlinkedBuiltinFunction : UnlinkedNormalFunction,
	error, parseMode);

	if (error.isValid())
	return nullptr;

	switch (specializationKind) {
	case CodeForCall:
	m_unlinkedCodeBlockForCall.set(vm, this, result);
	break;
	case CodeForConstruct:
	m_unlinkedCodeBlockForConstruct.set(vm, this, result);
	break;
	}
	return result;
	}

	void UnlinkedFunctionExecutable::setInvalidTypeProfilingOffsets()
	{
	m_typeProfilingStartOffset = std::numeric_limits<unsigned>::max();
	m_typeProfilingEndOffset = std::numeric_limits<unsigned>::max();
	}

	} // namespace JSC