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/****************************************************************************
**
** Copyright (C) 2018 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtQml module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qv4module_p.h"
#include <private/qv4mm_p.h>
#include <private/qv4vme_moth_p.h>
#include <private/qv4context_p.h>
#include <private/qv4symbol_p.h>
#include <private/qv4identifiertable_p.h>
using namespace QV4;
DEFINE_OBJECT_VTABLE(Module);
void Heap::Module::init(ExecutionEngine *engine, CompiledData::CompilationUnit *moduleUnit)
{
Object::init();
// This is a back pointer and there is no need to call addref() on the unit, because the unit
// owns this object instead.
unit = moduleUnit;
self.set(engine, this);
Function *moduleFunction = unit->runtimeFunctions[unit->unitData()->indexOfRootFunction];
const uint locals = moduleFunction->compiledFunction->nLocals;
const size_t requiredMemory = sizeof(QV4::CallContext::Data) - sizeof(Value) + sizeof(Value) * locals;
scope.set(engine, engine->memoryManager->allocManaged<QV4::CallContext>(requiredMemory, moduleFunction->internalClass));
scope->init();
scope->outer.set(engine, engine->rootContext()->d());
scope->locals.size = locals;
scope->locals.alloc = locals;
scope->nArgs = 0;
Scope valueScope(engine);
// It's possible for example to re-export an import, for example:
// import * as foo from "./bar.js"
// export { foo }
// Since we don't add imports to the locals, it won't be found typically.
// Except now we add imports at the end of the internal class in the index
// space past the locals, so that resolveExport can find it.
{
Scoped<QV4::InternalClass> ic(valueScope, scope->internalClass);
for (uint i = 0; i < unit->data->importEntryTableSize; ++i) {
const CompiledData::ImportEntry &import = unit->data->importEntryTable()[i];
ic = ic->addMember(engine->identifierTable->asPropertyKey(unit->runtimeStrings[import.localName]), Attr_NotConfigurable);
}
scope->internalClass.set(engine, ic->d());
}
Scoped<QV4::Module> This(valueScope, this);
ScopedString name(valueScope, engine->newString(QStringLiteral("Module")));
This->insertMember(engine->symbol_toStringTag(), name, Attr_ReadOnly);
This->setPrototypeUnchecked(nullptr);
}
ReturnedValue Module::virtualGet(const Managed *m, PropertyKey id, const Value *receiver, bool *hasProperty)
{
if (id.isSymbol())
return Object::virtualGet(m, id, receiver, hasProperty);
const Module *module = static_cast<const Module *>(m);
Scope scope(m->engine());
ScopedString expectedName(scope, id.toStringOrSymbol(scope.engine));
const Value *v = module->d()->unit->resolveExport(expectedName);
if (hasProperty)
*hasProperty = v != nullptr;
if (!v)
return Encode::undefined();
return v->asReturnedValue();
}
PropertyAttributes Module::virtualGetOwnProperty(Managed *m, PropertyKey id, Property *p)
{
if (id.isSymbol())
return Object::virtualGetOwnProperty(m, id, p);
const Module *module = static_cast<const Module *>(m);
Scope scope(m->engine());
ScopedString expectedName(scope, id.toStringOrSymbol(scope.engine));
const Value *v = module->d()->unit->resolveExport(expectedName);
if (!v) {
if (p)
p->value = Encode::undefined();
return Attr_Invalid;
}
if (p)
p->value = v->asReturnedValue();
return Attr_Data | Attr_NotConfigurable;
}
bool Module::virtualPreventExtensions(Managed *)
{
return true;
}
bool Module::virtualDefineOwnProperty(Managed *, PropertyKey, const Property *, PropertyAttributes)
{
return false;
}
bool Module::virtualPut(Managed *, PropertyKey, const Value &, Value *)
{
return false;
}
bool Module::virtualDeleteProperty(Managed *m, PropertyKey id)
{
if (id.isSymbol())
return Object::virtualDeleteProperty(m, id);
const Module *module = static_cast<const Module *>(m);
Scope scope(m->engine());
ScopedString expectedName(scope, id.toStringOrSymbol(scope.engine));
if (!expectedName)
return true;
const Value *v = module->d()->unit->resolveExport(expectedName);
if (v)
return false;
return true;
}
struct ModuleNamespaceIterator : ObjectOwnPropertyKeyIterator
{
QStringList exportedNames;
int exportIndex = 0;
ModuleNamespaceIterator(const QStringList &names) : exportedNames(names) {}
~ModuleNamespaceIterator() override = default;
PropertyKey next(const Object *o, Property *pd = nullptr, PropertyAttributes *attrs = nullptr) override;
};
PropertyKey ModuleNamespaceIterator::next(const Object *o, Property *pd, PropertyAttributes *attrs)
{
const Module *module = static_cast<const Module *>(o);
if (exportIndex < exportedNames.count()) {
if (attrs)
*attrs = Attr_Data;
Scope scope(module->engine());
ScopedString exportName(scope, scope.engine->newString(exportedNames.at(exportIndex)));
exportIndex++;
if (pd)
pd->value = *module->d()->unit->resolveExport(exportName);
return exportName->toPropertyKey();
}
return ObjectOwnPropertyKeyIterator::next(o, pd, attrs);
}
OwnPropertyKeyIterator *Module::virtualOwnPropertyKeys(const Object *o)
{
const Module *module = static_cast<const Module *>(o);
return new ModuleNamespaceIterator(module->d()->unit->exportedNames());
}
Heap::Object *Module::virtualGetPrototypeOf(const Managed *)
{
return nullptr;
}
bool Module::virtualSetPrototypeOf(Managed *, const Object *proto)
{
return proto == nullptr;
}
bool Module::virtualIsExtensible(const Managed *)
{
return false;
}
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