| /* |
| * Copyright (C) 2015-2021 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 "BuiltinNames.h" |
| #include "Interpreter.h" |
| #include "JSCInlines.h" |
| #include "JSModuleEnvironment.h" |
| #include "JSModuleLoader.h" |
| #include "JSModuleNamespaceObject.h" |
| #include "UnlinkedModuleProgramCodeBlock.h" |
| |
| namespace JSC { |
| |
| const ClassInfo JSModuleRecord::s_info = { "ModuleRecord", &Base::s_info, nullptr, nullptr, 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(JSGlobalObject* globalObject, VM& vm, Structure* structure, const Identifier& moduleKey, const SourceCode& sourceCode, const VariableEnvironment& declaredVariables, const VariableEnvironment& lexicalVariables) |
| { |
| JSModuleRecord* instance = new (NotNull, allocateCell<JSModuleRecord>(vm)) JSModuleRecord(vm, structure, moduleKey, sourceCode, declaredVariables, lexicalVariables); |
| instance->finishCreation(globalObject, 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(JSGlobalObject* globalObject, VM& vm) |
| { |
| Base::finishCreation(globalObject, vm); |
| ASSERT(inherits(vm, info())); |
| } |
| |
| template<typename Visitor> |
| void JSModuleRecord::visitChildrenImpl(JSCell* cell, Visitor& visitor) |
| { |
| JSModuleRecord* thisObject = jsCast<JSModuleRecord*>(cell); |
| ASSERT_GC_OBJECT_INHERITS(thisObject, info()); |
| Base::visitChildren(thisObject, visitor); |
| visitor.append(thisObject->m_moduleProgramExecutable); |
| } |
| |
| DEFINE_VISIT_CHILDREN(JSModuleRecord); |
| |
| Synchronousness JSModuleRecord::link(JSGlobalObject* globalObject, JSValue scriptFetcher) |
| { |
| VM& vm = globalObject->vm(); |
| auto scope = DECLARE_THROW_SCOPE(vm); |
| |
| ModuleProgramExecutable* executable = ModuleProgramExecutable::create(globalObject, sourceCode()); |
| EXCEPTION_ASSERT(!!scope.exception() == !executable); |
| if (!executable) { |
| throwSyntaxError(globalObject, scope); |
| return Synchronousness::Sync; |
| } |
| instantiateDeclarations(globalObject, executable, scriptFetcher); |
| RETURN_IF_EXCEPTION(scope, Synchronousness::Sync); |
| m_moduleProgramExecutable.set(vm, this, executable); |
| |
| return executable->unlinkedModuleProgramCodeBlock()->isAsync() ? Synchronousness::Async : Synchronousness::Sync; |
| } |
| |
| void JSModuleRecord::instantiateDeclarations(JSGlobalObject* globalObject, ModuleProgramExecutable* moduleProgramExecutable, JSValue scriptFetcher) |
| { |
| VM& vm = globalObject->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, globalObject, globalObject->globalLexicalEnvironment(), 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; |
| switch (exportEntry.type) { |
| case ExportEntry::Type::Local: |
| case ExportEntry::Type::Namespace: |
| break; |
| case ExportEntry::Type::Indirect: { |
| Resolution resolution = resolveExport(globalObject, exportEntry.exportName); |
| RETURN_IF_EXCEPTION(scope, void()); |
| switch (resolution.type) { |
| case Resolution::Type::NotFound: |
| throwSyntaxError(globalObject, scope, makeString("Indirectly exported binding name '", String(exportEntry.exportName.impl()), "' is not found.")); |
| return; |
| |
| case Resolution::Type::Ambiguous: |
| throwSyntaxError(globalObject, scope, makeString("Indirectly exported binding name '", String(exportEntry.exportName.impl()), "' cannot be resolved due to ambiguous multiple bindings.")); |
| return; |
| |
| case Resolution::Type::Error: |
| throwSyntaxError(globalObject, scope, makeString("Indirectly exported binding name 'default' cannot be resolved by star export entries.")); |
| return; |
| |
| case Resolution::Type::Resolved: |
| break; |
| } |
| break; |
| } |
| } |
| } |
| |
| // https://tc39.es/ecma262/#sec-source-text-module-record-initialize-environment step 8 |
| // 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(globalObject, importEntry.moduleRequest); |
| RETURN_IF_EXCEPTION(scope, void()); |
| switch (importEntry.type) { |
| case AbstractModuleRecord::ImportEntryType::Namespace: { |
| JSModuleNamespaceObject* namespaceObject = importedModule->getModuleNamespace(globalObject); |
| RETURN_IF_EXCEPTION(scope, void()); |
| bool putResult = false; |
| symbolTablePutTouchWatchpointSet(moduleEnvironment, globalObject, importEntry.localName, namespaceObject, /* shouldThrowReadOnlyError */ false, /* ignoreReadOnlyErrors */ true, putResult); |
| RETURN_IF_EXCEPTION(scope, void()); |
| break; |
| } |
| |
| case AbstractModuleRecord::ImportEntryType::Single: { |
| Resolution resolution = importedModule->resolveExport(globalObject, importEntry.importName); |
| RETURN_IF_EXCEPTION(scope, void()); |
| switch (resolution.type) { |
| case Resolution::Type::NotFound: |
| throwSyntaxError(globalObject, scope, makeString("Importing binding name '", String(importEntry.importName.impl()), "' is not found.")); |
| return; |
| |
| case Resolution::Type::Ambiguous: |
| throwSyntaxError(globalObject, scope, makeString("Importing binding name '", String(importEntry.importName.impl()), "' cannot be resolved due to ambiguous multiple bindings.")); |
| return; |
| |
| case Resolution::Type::Error: |
| throwSyntaxError(globalObject, scope, makeString("Importing binding name 'default' cannot be resolved by star export entries.")); |
| return; |
| |
| case Resolution::Type::Resolved: { |
| if (vm.propertyNames->starNamespacePrivateName == resolution.localName) { |
| resolution.moduleRecord->getModuleNamespace(globalObject); // Force module namespace object materialization. |
| RETURN_IF_EXCEPTION(scope, void()); |
| } |
| break; |
| } |
| } |
| 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, globalObject, Identifier::fromUid(vm, variable.key.get()), jsUndefined(), /* shouldThrowReadOnlyError */ false, /* ignoreReadOnlyErrors */ true, putResult); |
| RETURN_IF_EXCEPTION(scope, void()); |
| } |
| } |
| |
| // 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, moduleProgramExecutable->source()), moduleEnvironment); |
| bool putResult = false; |
| symbolTablePutTouchWatchpointSet(moduleEnvironment, globalObject, unlinkedFunctionExecutable->name(), function, /* shouldThrowReadOnlyError */ false, /* ignoreReadOnlyErrors */ true, putResult); |
| RETURN_IF_EXCEPTION(scope, void()); |
| } |
| } |
| |
| { |
| JSObject* metaProperties = globalObject->moduleLoader()->createImportMetaProperties(globalObject, identifierToJSValue(vm, moduleKey()), this, scriptFetcher); |
| RETURN_IF_EXCEPTION(scope, void()); |
| bool putResult = false; |
| symbolTablePutTouchWatchpointSet(moduleEnvironment, globalObject, vm.propertyNames->builtinNames().metaPrivateName(), metaProperties, /* shouldThrowReadOnlyError */ false, /* ignoreReadOnlyErrors */ true, putResult); |
| RETURN_IF_EXCEPTION(scope, void()); |
| } |
| |
| scope.release(); |
| setModuleEnvironment(globalObject, moduleEnvironment); |
| } |
| |
| JSValue JSModuleRecord::evaluate(JSGlobalObject* globalObject, JSValue sentValue, JSValue resumeMode) |
| { |
| if (!m_moduleProgramExecutable) |
| return jsUndefined(); |
| VM& vm = globalObject->vm(); |
| ModuleProgramExecutable* executable = m_moduleProgramExecutable.get(); |
| JSValue resultOrAwaitedValue = vm.interpreter->executeModuleProgram(this, executable, globalObject, moduleEnvironment(), sentValue, resumeMode); |
| if (JSValue state = internalField(Field::State).get(); !state.isNumber() || state.asNumber() == static_cast<unsigned>(State::Executing)) |
| m_moduleProgramExecutable.clear(); |
| return resultOrAwaitedValue; |
| } |
| |
| } // namespace JSC |
