qtdeclarative/tools/qmljs/qmljs.cpp

/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the V4VM module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
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** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
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#include "private/qv4object_p.h"
#include "private/qv4runtime_p.h"
#include "private/qv4functionobject_p.h"
#include "private/qv4errorobject_p.h"
#include "private/qv4globalobject_p.h"
#include "private/qv4codegen_p.h"
#include "private/qv4isel_moth_p.h"
#include "private/qv4vme_moth_p.h"
#include "private/qv4objectproto_p.h"
#include "private/qv4isel_p.h"
#include "private/qv4mm_p.h"
#include "private/qv4context_p.h"
#include "private/qv4script_p.h"
#include "private/qv4string_p.h"

#ifdef V4_ENABLE_JIT
#  include "private/qv4isel_masm_p.h"
#endif // V4_ENABLE_JIT

#include <QtCore/QCoreApplication>
#include <QtCore/QFile>
#include <private/qqmljsengine_p.h>
#include <private/qqmljslexer_p.h>
#include <private/qqmljsparser_p.h>
#include <private/qqmljsast_p.h>

#include <iostream>

namespace builtins {

using namespace QV4;

struct Print: FunctionObject
{
    struct Data : Heap::FunctionObject {
        void init(ExecutionContext *scope)
        {
            Heap::FunctionObject::init(scope, QStringLiteral("print"));
        }
    };
    V4_OBJECT(FunctionObject)

    static void call(const Managed *, Scope &scope, CallData *callData)
    {
        for (int i = 0; i < callData->argc; ++i) {
            QString s = callData->args[i].toQStringNoThrow();
            if (i)
                std::cout << ' ';
            std::cout << qPrintable(s);
        }
        std::cout << std::endl;
        scope.result = Encode::undefined();
    }
};

DEFINE_OBJECT_VTABLE(Print);

struct GC: public FunctionObject
{
    struct Data : Heap::FunctionObject {
        void init(ExecutionContext *scope)
        {
            Heap::FunctionObject::init(scope, QStringLiteral("gc"));
        }

    };
    V4_OBJECT(FunctionObject)

    static void call(const Managed *m, Scope &scope, CallData *)
    {
        static_cast<const GC *>(m)->engine()->memoryManager->runGC();
        scope.result = Encode::undefined();
    }
};

DEFINE_OBJECT_VTABLE(GC);

} // builtins

static void showException(QV4::ExecutionContext *ctx, const QV4::Value &exception, const QV4::StackTrace &trace)
{
    QV4::Scope scope(ctx);
    QV4::ScopedValue ex(scope, exception);
    QV4::ErrorObject *e = ex->as<QV4::ErrorObject>();
    if (!e) {
        std::cerr << "Uncaught exception: " << qPrintable(ex->toQString()) << std::endl;
    } else {
        QV4::ScopedString m(scope, scope.engine->newString(QStringLiteral("message")));
        QV4::ScopedValue message(scope, e->get(m));
        std::cerr << "Uncaught exception: " << qPrintable(message->toQStringNoThrow()) << std::endl;
    }

    for (const QV4::StackFrame &frame : trace) {
        std::cerr << "    at " << qPrintable(frame.function) << " (" << qPrintable(frame.source);
        if (frame.line >= 0)
            std::cerr << ':' << frame.line;
        std::cerr << ')' << std::endl;
    }
}

int main(int argc, char *argv[])
{
    QCoreApplication app(argc, argv);
    QStringList args = app.arguments();
    args.removeFirst();

    enum {
        use_masm,
        use_moth
    } mode;
#ifdef V4_ENABLE_JIT
    mode = use_masm;
#else
    mode = use_moth;
#endif

    bool runAsQml = false;

    if (!args.isEmpty()) {
        if (args.first() == QLatin1String("--jit")) {
            mode = use_masm;
            args.removeFirst();
        }

        if (args.first() == QLatin1String("--interpret")) {
            mode = use_moth;
            args.removeFirst();
        }

        if (args.first() == QLatin1String("--qml")) {
            runAsQml = true;
            args.removeFirst();
        }

        if (args.first() == QLatin1String("--help")) {
            std::cerr << "Usage: qmljs [|--jit|--interpret|--qml] file..." << std::endl;
            return EXIT_SUCCESS;
        }
    }

    switch (mode) {
    case use_masm:
    case use_moth: {
        QV4::EvalISelFactory* iSelFactory = 0;
        if (mode == use_moth) {
            iSelFactory = new QV4::Moth::ISelFactory;
#ifdef V4_ENABLE_JIT
        } else {
            iSelFactory = new QV4::JIT::ISelFactory;
#endif // V4_ENABLE_JIT
        }

        QV4::ExecutionEngine vm(iSelFactory);

        QV4::Scope scope(&vm);
        QV4::ScopedContext ctx(scope, vm.rootContext());

        QV4::ScopedObject print(scope, vm.memoryManager->allocObject<builtins::Print>(vm.rootContext()));
        vm.globalObject->put(QV4::ScopedString(scope, vm.newIdentifier(QStringLiteral("print"))).getPointer(), print);
        QV4::ScopedObject gc(scope, vm.memoryManager->allocObject<builtins::GC>(ctx));
        vm.globalObject->put(QV4::ScopedString(scope, vm.newIdentifier(QStringLiteral("gc"))).getPointer(), gc);

        for (const QString &fn : qAsConst(args)) {
            QFile file(fn);
            if (file.open(QFile::ReadOnly)) {
                const QString code = QString::fromUtf8(file.readAll());
                file.close();

                QV4::ScopedValue result(scope);
                QV4::Script script(ctx, code, fn);
                script.parseAsBinding = runAsQml;
                script.parse();
                if (!scope.engine->hasException)
                    result = script.run();
                if (scope.engine->hasException) {
                    QV4::StackTrace trace;
                    QV4::ScopedValue ex(scope, scope.engine->catchException(&trace));
                    showException(ctx, ex, trace);
                    return EXIT_FAILURE;
                }
                if (!result->isUndefined()) {
                    if (! qgetenv("SHOW_EXIT_VALUE").isEmpty())
                        std::cout << "exit value: " << qPrintable(result->toQString()) << std::endl;
                }
            } else {
                std::cerr << "Error: cannot open file " << fn.toUtf8().constData() << std::endl;
                return EXIT_FAILURE;
            }
        }

        vm.memoryManager->dumpStats();
    } return EXIT_SUCCESS;
    } // switch (mode)
}