338 lines
10 KiB
C++
338 lines
10 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/legal
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**
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** This file is part of the V4VM module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Digia. For licensing terms and
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** conditions see http://qt.digia.com/licensing. For further information
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** use the contact form at http://qt.digia.com/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Digia gives you certain additional
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** rights. These rights are described in the Digia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3.0 as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 3.0 requirements will be
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** met: http://www.gnu.org/copyleft/gpl.html.
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include <qmljs_environment.h>
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#include <qmljs_objects.h>
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#include <qv4ecmaobjects_p.h>
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namespace QQmlJS {
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namespace VM {
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DiagnosticMessage::DiagnosticMessage()
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: fileName(0)
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, offset(0)
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, length(0)
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, startLine(0)
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, startColumn(0)
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, type(0)
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, message(0)
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, next(0)
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{}
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DeclarativeEnvironment::DeclarativeEnvironment(ExecutionEngine *e)
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{
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engine = e;
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outer = 0;
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arguments = 0;
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argumentCount = 0;
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locals = 0;
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formals = 0;
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formalCount = 0;
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vars = 0;
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varCount = 0;
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activation = 0;
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withObject = 0;
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strictMode = false;
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}
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DeclarativeEnvironment::DeclarativeEnvironment(FunctionObject *f, Value *args, uint argc)
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{
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outer = f->scope;
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engine = outer->engine;
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strictMode = f->strictMode;
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formals = f->formalParameterList;
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formalCount = f->formalParameterCount;
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arguments = args;
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argumentCount = argc;
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if (f->needsActivation || argc < formalCount){
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arguments = new Value[qMax(argc, formalCount)];
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if (argc)
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std::copy(args, args + argc, arguments);
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if (argc < formalCount)
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std::fill(arguments + argc, arguments + formalCount, Value::undefinedValue());
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}
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vars = f->varList;
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varCount = f->varCount;
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locals = varCount ? new Value[varCount] : 0;
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if (varCount)
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std::fill(locals, locals + varCount, Value::undefinedValue());
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if (f->needsActivation)
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activation = engine->newActivationObject(this);
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else
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activation = 0;
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withObject = 0;
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}
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bool DeclarativeEnvironment::hasBinding(String *name) const
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{
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for (unsigned int i = 0; i < varCount; ++i) {
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if (__qmljs_string_equal(vars[i], name))
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return true;
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}
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for (unsigned int i = 0; i < formalCount; ++i) {
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if (__qmljs_string_equal(formals[i], name))
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return true;
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}
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return false;
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}
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void DeclarativeEnvironment::createMutableBinding(ExecutionContext *ctx, String *name, bool deletable)
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{
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if (!activation)
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activation = engine->newActivationObject(this);
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if (activation->__hasProperty__(ctx, name))
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return;
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PropertyDescriptor desc;
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desc.value = Value::undefinedValue();
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desc.type = PropertyDescriptor::Data;
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desc.configurable = deletable ? PropertyDescriptor::Set : PropertyDescriptor::Unset;
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desc.writable = PropertyDescriptor::Set;
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desc.enumberable = PropertyDescriptor::Set;
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activation->__defineOwnProperty__(ctx, name, &desc);
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}
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void DeclarativeEnvironment::setMutableBinding(String *name, Value value, bool strict)
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{
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Q_UNUSED(strict);
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// ### throw if strict is true, and it would change an immutable binding
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for (unsigned int i = 0; i < varCount; ++i) {
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if (__qmljs_string_equal(vars[i], name)) {
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locals[i] = value;
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return;
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}
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}
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for (unsigned int i = 0; i < formalCount; ++i) {
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if (__qmljs_string_equal(formals[i], name)) {
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arguments[i] = value;
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return;
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}
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}
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assert(false);
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}
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Value DeclarativeEnvironment::getBindingValue(String *name, bool strict) const
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{
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Q_UNUSED(strict);
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for (unsigned int i = 0; i < varCount; ++i) {
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if (__qmljs_string_equal(vars[i], name))
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return locals[i];
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}
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for (unsigned int i = 0; i < formalCount; ++i) {
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if (__qmljs_string_equal(formals[i], name))
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return arguments[i];
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}
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assert(false);
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}
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bool DeclarativeEnvironment::deleteBinding(ExecutionContext *ctx, String *name)
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{
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if (activation)
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activation->__delete__(ctx, name);
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if (ctx->lexicalEnvironment->strictMode)
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__qmljs_throw_type_error(ctx);
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return false;
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}
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void DeclarativeEnvironment::pushWithObject(Object *with)
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{
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With *w = new With;
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w->next = withObject;
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w->object = with;
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withObject = w;
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}
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void DeclarativeEnvironment::popWithObject()
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{
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assert(withObject);
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With *w = withObject;
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withObject = w->next;
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delete w;
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}
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void ExecutionContext::init(ExecutionEngine *eng)
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{
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engine = eng;
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parent = 0;
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variableEnvironment = new DeclarativeEnvironment(eng);
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lexicalEnvironment = variableEnvironment;
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thisObject = Value::nullValue();
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eng->exception = Value::undefinedValue();
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}
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PropertyDescriptor *ExecutionContext::lookupPropertyDescriptor(String *name, PropertyDescriptor *tmp)
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{
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for (DeclarativeEnvironment *ctx = lexicalEnvironment; ctx; ctx = ctx->outer) {
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if (ctx->withObject) {
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DeclarativeEnvironment::With *w = ctx->withObject;
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while (w) {
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if (PropertyDescriptor *pd = w->object->__getPropertyDescriptor__(this, name, tmp))
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return pd;
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w = w->next;
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}
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}
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if (ctx->activation) {
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if (PropertyDescriptor *pd = ctx->activation->__getPropertyDescriptor__(this, name, tmp))
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return pd;
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}
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}
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return 0;
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}
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bool ExecutionContext::deleteProperty(String *name)
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{
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for (DeclarativeEnvironment *ctx = lexicalEnvironment; ctx; ctx = ctx->outer) {
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if (ctx->withObject) {
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DeclarativeEnvironment::With *w = ctx->withObject;
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while (w) {
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if (w->object->__hasProperty__(this, name))
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w->object->__delete__(this, name);
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w = w->next;
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}
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}
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if (ctx->activation) {
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if (ctx->activation->__hasProperty__(this, name))
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ctx->activation->__delete__(this, name);
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}
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}
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// ### throw syntax error in strict mode
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return true;
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}
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void ExecutionContext::inplaceBitOp(Value value, String *name, BinOp op)
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{
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for (DeclarativeEnvironment *ctx = lexicalEnvironment; ctx; ctx = ctx->outer) {
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if (ctx->activation) {
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if (ctx->activation->inplaceBinOp(value, name, op, this))
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return;
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}
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}
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throwReferenceError(Value::fromString(name));
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}
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void ExecutionContext::throwError(Value value)
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{
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__qmljs_builtin_throw(value, this);
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}
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void ExecutionContext::throwError(const QString &message)
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{
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Value v = Value::fromString(this, message);
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throwError(Value::fromObject(engine->newErrorObject(v)));
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}
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void ExecutionContext::throwSyntaxError(DiagnosticMessage *message)
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{
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throwError(Value::fromObject(engine->newSyntaxErrorObject(this, message)));
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}
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void ExecutionContext::throwTypeError()
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{
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Value v = Value::fromString(this, QStringLiteral("Type error"));
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throwError(Value::fromObject(engine->newErrorObject(v)));
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}
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void ExecutionContext::throwUnimplemented(const QString &message)
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{
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Value v = Value::fromString(this, QStringLiteral("Unimplemented ") + message);
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throwError(Value::fromObject(engine->newErrorObject(v)));
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}
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void ExecutionContext::throwReferenceError(Value value)
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{
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String *s = value.toString(this);
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QString msg = s->toQString() + QStringLiteral(" is not defined");
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throwError(Value::fromObject(engine->newErrorObject(Value::fromString(this, msg))));
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}
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void ExecutionContext::initCallContext(ExecutionContext *parent, const Value that, FunctionObject *f, Value *args, unsigned argc)
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{
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engine = parent->engine;
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this->parent = parent;
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variableEnvironment = new DeclarativeEnvironment(f, args, argc);
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lexicalEnvironment = variableEnvironment;
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thisObject = that;
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}
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void ExecutionContext::leaveCallContext()
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{
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// ## Should rather be handled by a the activation object having a ref to the environment
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if (variableEnvironment->activation) {
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delete[] variableEnvironment->locals;
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variableEnvironment->locals = 0;
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}
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}
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void ExecutionContext::initConstructorContext(ExecutionContext *parent, Value that, FunctionObject *f, Value *args, unsigned argc)
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{
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initCallContext(parent, that, f, args, argc);
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}
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void ExecutionContext::leaveConstructorContext(FunctionObject *f)
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{
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wireUpPrototype(f);
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leaveCallContext();
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}
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void ExecutionContext::wireUpPrototype(FunctionObject *f)
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{
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assert(thisObject.isObject());
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Value proto = f->__get__(this, engine->id_prototype);
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if (proto.isObject())
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thisObject.objectValue()->prototype = proto.objectValue();
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else
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thisObject.objectValue()->prototype = engine->objectPrototype;
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}
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} // namespace VM
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} // namespace QQmlJS
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