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// Copyright (C) 2017 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
#ifndef QV4JSCALL_H
#define QV4JSCALL_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 "qv4object_p.h"
#include "qv4function_p.h"
#include "qv4functionobject_p.h"
#include "qv4context_p.h"
#include "qv4scopedvalue_p.h"
#include "qv4stackframe_p.h"
#include "qv4qobjectwrapper_p.h"
#include <private/qv4alloca_p.h>
QT_BEGIN_NAMESPACE
namespace QV4 {
template<typename Args>
CallData *callDatafromJS(const Scope &scope, const Args *args, const FunctionObject *f = nullptr)
{
int size = int(offsetof(QV4::CallData, args)/sizeof(QV4::Value)) + args->argc;
CallData *ptr = reinterpret_cast<CallData *>(scope.alloc<Scope::Uninitialized>(size));
ptr->function = Encode::undefined();
ptr->context = Encode::undefined();
ptr->accumulator = Encode::undefined();
ptr->thisObject = args->thisObject ? args->thisObject->asReturnedValue() : Encode::undefined();
ptr->newTarget = Encode::undefined();
ptr->setArgc(args->argc);
if (args->argc)
memcpy(ptr->args, args->args, args->argc*sizeof(Value));
if (f)
ptr->function = f->asReturnedValue();
return ptr;
}
struct JSCallArguments
{
JSCallArguments(const Scope &scope, int argc = 0)
: thisObject(scope.alloc()), args(scope.alloc(argc)), argc(argc)
{
}
CallData *callData(const Scope &scope, const FunctionObject *f = nullptr) const
{
return callDatafromJS(scope, this, f);
}
Value *thisObject;
Value *args;
const int argc;
};
struct JSCallData
{
JSCallData(const Value *thisObject, const Value *argv, int argc)
: thisObject(thisObject), args(argv), argc(argc)
{
}
Q_IMPLICIT JSCallData(const JSCallArguments &args)
: thisObject(args.thisObject), args(args.args), argc(args.argc)
{
}
CallData *callData(const Scope &scope, const FunctionObject *f = nullptr) const
{
return callDatafromJS(scope, this, f);
}
const Value *thisObject;
const Value *args;
const int argc;
};
inline
ReturnedValue FunctionObject::callAsConstructor(const JSCallData &data) const
{
return callAsConstructor(data.args, data.argc, this);
}
inline
ReturnedValue FunctionObject::call(const JSCallData &data) const
{
return call(data.thisObject, data.args, data.argc);
}
void populateJSCallArguments(ExecutionEngine *v4, JSCallArguments &jsCall, int argc,
void **args, const QMetaType *types);
struct ScopedStackFrame
{
ScopedStackFrame(const Scope &scope, ExecutionContext *context)
: engine(scope.engine)
{
frame.init(engine->currentStackFrame ? engine->currentStackFrame->v4Function : nullptr,
nullptr, context, nullptr, nullptr, 0);
frame.push(engine);
}
~ScopedStackFrame()
{
frame.pop(engine);
}
private:
ExecutionEngine *engine = nullptr;
MetaTypesStackFrame frame;
};
template<typename Callable>
ReturnedValue convertAndCall(
ExecutionEngine *engine, const QQmlPrivate::AOTCompiledFunction *aotFunction,
const Value *thisObject, const Value *argv, int argc, Callable call)
{
const qsizetype numFunctionArguments = aotFunction->argumentTypes.size();
Q_ALLOCA_VAR(void *, values, (numFunctionArguments + 1) * sizeof(void *));
Q_ALLOCA_VAR(QMetaType, types, (numFunctionArguments + 1) * sizeof(QMetaType));
for (qsizetype i = 0; i < numFunctionArguments; ++i) {
const QMetaType argumentType = aotFunction->argumentTypes[i];
types[i + 1] = argumentType;
if (const qsizetype argumentSize = argumentType.sizeOf()) {
Q_ALLOCA_VAR(void, argument, argumentSize);
argumentType.construct(argument);
if (i < argc)
engine->metaTypeFromJS(argv[i], argumentType, argument);
values[i + 1] = argument;
} else {
values[i + 1] = nullptr;
}
}
Q_ALLOCA_DECLARE(void, returnValue);
types[0] = aotFunction->returnType;
if (const qsizetype returnSize = types[0].sizeOf()) {
Q_ALLOCA_ASSIGN(void, returnValue, returnSize);
values[0] = returnValue;
} else {
values[0] = nullptr;
}
if (const QV4::QObjectWrapper *cppThisObject = thisObject->as<QV4::QObjectWrapper>())
call(cppThisObject->object(), values, types, argc);
else
call(nullptr, values, types, argc);
ReturnedValue result;
if (values[0]) {
result = engine->metaTypeToJS(types[0], values[0]);
types[0].destruct(values[0]);
} else {
result = Encode::undefined();
}
for (qsizetype i = 1, end = numFunctionArguments + 1; i < end; ++i)
types[i].destruct(values[i]);
return result;
}
template<typename Callable>
bool convertAndCall(ExecutionEngine *engine, QObject *thisObject,
void **a, const QMetaType *types, int argc, Callable call)
{
Scope scope(engine);
QV4::JSCallArguments jsCallData(scope, argc);
for (int ii = 0; ii < argc; ++ii)
jsCallData.args[ii] = engine->metaTypeToJS(types[ii + 1], a[ii + 1]);
ScopedObject jsThisObject(scope);
if (thisObject) {
// The result of wrap() can only be null, undefined, or an object.
jsThisObject = QV4::QObjectWrapper::wrap(engine, thisObject);
if (!jsThisObject)
jsThisObject = engine->globalObject;
} else {
jsThisObject = engine->globalObject;
}
ScopedValue jsResult(scope, call(jsThisObject, jsCallData.args, argc));
void *result = a[0];
if (!result)
return !jsResult->isUndefined();
const QMetaType resultType = types[0];
if (scope.hasException()) {
// Clear the return value
resultType.construct(result);
} else {
// When the return type is QVariant, JS objects are to be returned as
// QJSValue wrapped in QVariant. metaTypeFromJS unwraps them, unfortunately.
if (resultType == QMetaType::fromType<QVariant>()) {
new (result) QVariant(scope.engine->toVariant(jsResult, QMetaType {}));
} else {
resultType.construct(result);
scope.engine->metaTypeFromJS(jsResult, resultType, result);
}
}
return !jsResult->isUndefined();
}
}
QT_END_NAMESPACE
#endif // QV4JSCALL_H
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