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/*
* Copyright (C) 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 "JSModuleRecord.h"
#include "Error.h"
#include "Interpreter.h"
#include "JSCInlines.h"
#include "JSModuleEnvironment.h"
#include "JSModuleNamespaceObject.h"
#include "UnlinkedModuleProgramCodeBlock.h"
namespace JSC {
const ClassInfo JSModuleRecord::s_info = { "ModuleRecord", &Base::s_info, 0, CREATE_METHOD_TABLE(JSModuleRecord) };
Structure* JSModuleRecord::createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
{
return Structure::create(vm, globalObject, prototype, TypeInfo(ObjectType, StructureFlags), info());
}
JSModuleRecord* JSModuleRecord::create(ExecState* exec, VM& vm, Structure* structure, const Identifier& moduleKey, const SourceCode& sourceCode, const VariableEnvironment& declaredVariables, const VariableEnvironment& lexicalVariables)
{
JSModuleRecord* instance = new (NotNull, allocateCell<JSModuleRecord>(vm.heap)) JSModuleRecord(vm, structure, moduleKey, sourceCode, declaredVariables, lexicalVariables);
instance->finishCreation(exec, vm);
return instance;
}
JSModuleRecord::JSModuleRecord(VM& vm, Structure* structure, const Identifier& moduleKey, const SourceCode& sourceCode, const VariableEnvironment& declaredVariables, const VariableEnvironment& lexicalVariables)
: Base(vm, structure, moduleKey)
, m_sourceCode(sourceCode)
, m_declaredVariables(declaredVariables)
, m_lexicalVariables(lexicalVariables)
{
}
void JSModuleRecord::destroy(JSCell* cell)
{
JSModuleRecord* thisObject = static_cast<JSModuleRecord*>(cell);
thisObject->JSModuleRecord::~JSModuleRecord();
}
void JSModuleRecord::finishCreation(ExecState* exec, VM& vm)
{
Base::finishCreation(exec, vm);
ASSERT(inherits(vm, info()));
}
void JSModuleRecord::visitChildren(JSCell* cell, SlotVisitor& visitor)
{
JSModuleRecord* thisObject = jsCast<JSModuleRecord*>(cell);
Base::visitChildren(thisObject, visitor);
visitor.append(thisObject->m_moduleProgramExecutable);
}
void JSModuleRecord::link(ExecState* exec)
{
VM& vm = exec->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
ModuleProgramExecutable* executable = ModuleProgramExecutable::create(exec, sourceCode());
if (!executable) {
throwSyntaxError(exec, scope);
return;
}
instantiateDeclarations(exec, executable);
RETURN_IF_EXCEPTION(scope, void());
m_moduleProgramExecutable.set(vm, this, executable);
}
void JSModuleRecord::instantiateDeclarations(ExecState* exec, ModuleProgramExecutable* moduleProgramExecutable)
{
VM& vm = exec->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
// http://www.ecma-international.org/ecma-262/6.0/#sec-moduledeclarationinstantiation
SymbolTable* symbolTable = moduleProgramExecutable->moduleEnvironmentSymbolTable();
JSModuleEnvironment* moduleEnvironment = JSModuleEnvironment::create(vm, exec->lexicalGlobalObject(), exec->lexicalGlobalObject(), symbolTable, jsTDZValue(), this);
// http://www.ecma-international.org/ecma-262/6.0/#sec-moduledeclarationinstantiation
// section 15.2.1.16.4 step 9.
// Ensure all the indirect exports are correctly resolved to unique bindings.
// Even if we avoided duplicate exports in the parser, still ambiguous exports occur due to the star export (`export * from "mod"`).
// When we see this type of ambiguity for the indirect exports here, throw a syntax error.
for (const auto& pair : exportEntries()) {
const ExportEntry& exportEntry = pair.value;
if (exportEntry.type == JSModuleRecord::ExportEntry::Type::Indirect) {
Resolution resolution = resolveExport(exec, exportEntry.exportName);
switch (resolution.type) {
case Resolution::Type::NotFound:
throwSyntaxError(exec, scope, makeString("Indirectly exported binding name '", String(exportEntry.exportName.impl()), "' is not found."));
return;
case Resolution::Type::Ambiguous:
throwSyntaxError(exec, scope, makeString("Indirectly exported binding name '", String(exportEntry.exportName.impl()), "' cannot be resolved due to ambiguous multiple bindings."));
return;
case Resolution::Type::Error:
throwSyntaxError(exec, scope, makeString("Indirectly exported binding name 'default' cannot be resolved by star export entries."));
return;
case Resolution::Type::Resolved:
break;
}
}
}
// http://www.ecma-international.org/ecma-262/6.0/#sec-moduledeclarationinstantiation
// section 15.2.1.16.4 step 12.
// Instantiate namespace objects and initialize the bindings with them if required.
// And ensure that all the imports correctly resolved to unique bindings.
for (const auto& pair : importEntries()) {
const ImportEntry& importEntry = pair.value;
AbstractModuleRecord* importedModule = hostResolveImportedModule(exec, importEntry.moduleRequest);
if (importEntry.isNamespace(vm)) {
JSModuleNamespaceObject* namespaceObject = importedModule->getModuleNamespace(exec);
RETURN_IF_EXCEPTION(scope, void());
bool putResult = false;
symbolTablePutTouchWatchpointSet(moduleEnvironment, exec, importEntry.localName, namespaceObject, /* shouldThrowReadOnlyError */ false, /* ignoreReadOnlyErrors */ true, putResult);
} else {
Resolution resolution = importedModule->resolveExport(exec, importEntry.importName);
switch (resolution.type) {
case Resolution::Type::NotFound:
throwSyntaxError(exec, scope, makeString("Importing binding name '", String(importEntry.importName.impl()), "' is not found."));
return;
case Resolution::Type::Ambiguous:
throwSyntaxError(exec, scope, makeString("Importing binding name '", String(importEntry.importName.impl()), "' cannot be resolved due to ambiguous multiple bindings."));
return;
case Resolution::Type::Error:
throwSyntaxError(exec, scope, makeString("Importing binding name 'default' cannot be resolved by star export entries."));
return;
case Resolution::Type::Resolved:
break;
}
}
}
// http://www.ecma-international.org/ecma-262/6.0/#sec-moduledeclarationinstantiation
// section 15.2.1.16.4 step 14.
// Module environment contains the heap allocated "var", "function", "let", "const", and "class".
// When creating the environment, we initialized all the slots with empty, it's ok for lexical values.
// But for "var" and "function", we should initialize it with undefined. They are contained in the declared variables.
for (const auto& variable : declaredVariables()) {
SymbolTableEntry entry = symbolTable->get(variable.key.get());
VarOffset offset = entry.varOffset();
if (!offset.isStack()) {
bool putResult = false;
symbolTablePutTouchWatchpointSet(moduleEnvironment, exec, Identifier::fromUid(exec, variable.key.get()), jsUndefined(), /* shouldThrowReadOnlyError */ false, /* ignoreReadOnlyErrors */ true, putResult);
}
}
// http://www.ecma-international.org/ecma-262/6.0/#sec-moduledeclarationinstantiation
// section 15.2.1.16.4 step 16-a-iv.
// Initialize heap allocated function declarations.
// They can be called before the body of the module is executed under circular dependencies.
UnlinkedModuleProgramCodeBlock* unlinkedCodeBlock = moduleProgramExecutable->unlinkedModuleProgramCodeBlock();
for (size_t i = 0, numberOfFunctions = unlinkedCodeBlock->numberOfFunctionDecls(); i < numberOfFunctions; ++i) {
UnlinkedFunctionExecutable* unlinkedFunctionExecutable = unlinkedCodeBlock->functionDecl(i);
SymbolTableEntry entry = symbolTable->get(unlinkedFunctionExecutable->name().impl());
VarOffset offset = entry.varOffset();
if (!offset.isStack()) {
ASSERT(!unlinkedFunctionExecutable->name().isEmpty());
if (vm.typeProfiler() || vm.controlFlowProfiler()) {
vm.functionHasExecutedCache()->insertUnexecutedRange(moduleProgramExecutable->sourceID(),
unlinkedFunctionExecutable->typeProfilingStartOffset(),
unlinkedFunctionExecutable->typeProfilingEndOffset());
}
JSFunction* function = JSFunction::create(vm, unlinkedFunctionExecutable->link(vm, moduleProgramExecutable->source()), moduleEnvironment);
bool putResult = false;
symbolTablePutTouchWatchpointSet(moduleEnvironment, exec, unlinkedFunctionExecutable->name(), function, /* shouldThrowReadOnlyError */ false, /* ignoreReadOnlyErrors */ true, putResult);
}
}
m_moduleEnvironment.set(vm, this, moduleEnvironment);
}
JSValue JSModuleRecord::evaluate(ExecState* exec)
{
if (!m_moduleProgramExecutable)
return jsUndefined();
JSValue result = exec->interpreter()->execute(m_moduleProgramExecutable.get(), exec, m_moduleEnvironment.get());
m_moduleProgramExecutable.clear();
return result;
}
} // namespace JSC
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