qv4function_p.h - mozsearch

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// Copyright (C) 2016 The Qt Company Ltd.

// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only

// Qt-Security score:significant

#ifndef QV4FUNCTION_H

#define QV4FUNCTION_H

//

//  W A R N I N G

//  -------------

//

// This file is not part of the Qt API.  It exists purely as an

// implementation detail.  This header file may change from version to

// version without notice, or even be removed.

//

// We mean it.

//

#include <qqmlprivate.h>

#include "qv4global_p.h"

#include <private/qv4executablecompilationunit_p.h>

#include <private/qv4context_p.h>

#include <private/qv4string_p.h>

namespace JSC {

class MacroAssemblerCodeRef;

QT_BEGIN_NAMESPACE

struct QQmlSourceLocation;

namespace QV4 {

struct Q_QML_EXPORT FunctionData

    WriteBarrier::HeapObjectWrapper<CompilationUnitRuntimeData, 1> compilationUnit;

    // Intentionally require an ExecutableCompilationUnit but save only a pointer to

    // CompilationUnitBase. This is so that we can take advantage of the standard layout

    // of CompilationUnitBase in the JIT. Furthermore we can safely static_cast to

    // ExecutableCompilationUnit where we need it.

    FunctionData(EngineBase *engine, ExecutableCompilationUnit *compilationUnit_);

};

// Make sure this class can be accessed through offsetof (done by the assemblers):

Q_STATIC_ASSERT(std::is_standard_layout< FunctionData >::value);

struct Q_QML_EXPORT Function : public FunctionData {

protected:

    Function(ExecutionEngine *engine, ExecutableCompilationUnit *unit,

             const CompiledData::Function *function, const QQmlPrivate::AOTCompiledFunction *aotFunction);

    ~Function();

public:

    struct JSTypedFunction {

        QVarLengthArray<QQmlType, 4> types;

};

    struct AOTCompiledFunction {

        QVarLengthArray<QMetaType, 4> types;

};

    QV4::ExecutableCompilationUnit *executableCompilationUnit() const

        // This is safe: We require an ExecutableCompilationUnit in the ctor.

        return static_cast<QV4::ExecutableCompilationUnit *>(compilationUnit.get());

    QV4::Heap::String *runtimeString(uint i) const

        return compilationUnit->runtimeStrings[i];

    bool call(QObject *thisObject, void **a, const QMetaType *types, int argc,

              ExecutionContext *context);

    ReturnedValue call(const Value *thisObject, const Value *argv, int argc,

                       ExecutionContext *context);

    const CompiledData::Function *compiledFunction = nullptr;

    const char *codeData = nullptr;

    JSC::MacroAssemblerCodeRef *codeRef = nullptr;

    typedef ReturnedValue (*JittedCode)(CppStackFrame *, ExecutionEngine *);

    typedef void (*AotCompiledCode)(const QQmlPrivate::AOTCompiledContext *context, void **argv);

    union {

        void *noFunction = nullptr;

        JSTypedFunction jsTypedFunction;

        AOTCompiledFunction aotCompiledFunction;

};

    union {

        JittedCode jittedCode = nullptr;

        AotCompiledCode aotCompiledCode;

};

    // first nArguments names in internalClass are the actual arguments

    QV4::WriteBarrier::Pointer<Heap::InternalClass> internalClass;

    int interpreterCallCount = 0;

    quint16 nFormals = 0;

    enum Kind : quint8 { JsUntyped, JsTyped, AotCompiled, Eval };

    Kind kind = JsUntyped;

    bool detectedInjectedParameters = false;

    static Function *create(ExecutionEngine *engine, ExecutableCompilationUnit *unit,

                            const CompiledData::Function *function,

                            const QQmlPrivate::AOTCompiledFunction *aotFunction);

    void destroy();

    void mark(QV4::MarkStack *ms);

    // used when dynamically assigning signal handlers (QQmlConnection)

    void updateInternalClass(ExecutionEngine *engine, const QList<QByteArray> &parameters);

    inline Heap::String *name() const {

        return runtimeString(compiledFunction->nameIndex);

    static QString prettyName(const Function *function, const void *address);

    inline QString sourceFile() const { return executableCompilationUnit()->fileName(); }

    inline QUrl finalUrl() const { return executableCompilationUnit()->finalUrl(); }

    inline bool isStrict() const { return compiledFunction->flags & CompiledData::Function::IsStrict; }

    inline bool isArrowFunction() const { return compiledFunction->flags & CompiledData::Function::IsArrowFunction; }

    inline bool isGenerator() const { return compiledFunction->flags & CompiledData::Function::IsGenerator; }

    inline bool isClosureWrapper() const { return compiledFunction->flags & CompiledData::Function::IsClosureWrapper; }

    QQmlSourceLocation sourceLocation() const;

    Function *nestedFunction() const

        if (compiledFunction->nestedFunctionIndex == std::numeric_limits<uint32_t>::max())

            return nullptr;

        return executableCompilationUnit()->runtimeFunctions[compiledFunction->nestedFunctionIndex];

    bool isJittable() const { return kind != Function::AotCompiled && !isGenerator(); }

};

QT_END_NAMESPACE

#endif