webkitgtk-2.16.5HEADwebkitgtk-2.16.5master

1 files changed, 213 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/runtime/JSModuleRecord.cpp b/Source/JavaScriptCore/runtime/JSModuleRecord.cpp
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+++ b/Source/JavaScriptCore/runtime/JSModuleRecord.cpp
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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