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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.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QV4STACKFRAME_H
#define QV4STACKFRAME_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 <private/qv4context_p.h>
#include <private/qv4enginebase_p.h>
#ifndef V4_BOOTSTRAP
#include <private/qv4function_p.h>
#endif
QT_BEGIN_NAMESPACE
namespace QV4 {
struct CallData
{
enum Offsets {
Function = 0,
Context = 1,
Accumulator = 2,
This = 3,
NewTarget = 4,
Argc = 5,
LastOffset = Argc,
OffsetCount = LastOffset + 1
};
Value function;
Value context;
Value accumulator;
Value thisObject;
Value newTarget;
Value _argc;
int argc() const {
Q_ASSERT(_argc.isInteger());
return _argc.int_32();
}
void setArgc(int argc) {
Q_ASSERT(argc >= 0);
_argc.setInt_32(argc);
}
inline ReturnedValue argument(int i) const {
return i < argc() ? args[i].asReturnedValue() : Primitive::undefinedValue().asReturnedValue();
}
Value args[1];
static Q_DECL_CONSTEXPR int HeaderSize() { return offsetof(CallData, args) / sizeof(QV4::Value); }
};
Q_STATIC_ASSERT(std::is_standard_layout<CallData>::value);
Q_STATIC_ASSERT(offsetof(CallData, function ) == CallData::Function * sizeof(Value));
Q_STATIC_ASSERT(offsetof(CallData, context ) == CallData::Context * sizeof(Value));
Q_STATIC_ASSERT(offsetof(CallData, accumulator) == CallData::Accumulator * sizeof(Value));
Q_STATIC_ASSERT(offsetof(CallData, thisObject ) == CallData::This * sizeof(Value));
Q_STATIC_ASSERT(offsetof(CallData, newTarget ) == CallData::NewTarget * sizeof(Value));
Q_STATIC_ASSERT(offsetof(CallData, _argc ) == CallData::Argc * sizeof(Value));
Q_STATIC_ASSERT(offsetof(CallData, args ) == 6 * sizeof(Value));
struct Q_QML_EXPORT CppStackFrame {
EngineBase *engine;
Value *savedStackTop;
CppStackFrame *parent;
Function *v4Function;
CallData *jsFrame;
const Value *originalArguments;
int originalArgumentsCount;
int instructionPointer;
const char *yield;
const char *unwindHandler;
const char *unwindLabel;
int unwindLevel;
bool yieldIsIterator;
void init(EngineBase *engine, Function *v4Function, const Value *argv, int argc) {
this->engine = engine;
this->v4Function = v4Function;
originalArguments = argv;
originalArgumentsCount = argc;
instructionPointer = 0;
yield = nullptr;
unwindHandler = nullptr;
unwindLabel = nullptr;
unwindLevel = 0;
yieldIsIterator = false;
}
void push() {
parent = engine->currentStackFrame;
engine->currentStackFrame = this;
savedStackTop = engine->jsStackTop;
}
void pop() {
engine->currentStackFrame = parent;
engine->jsStackTop = savedStackTop;
}
#ifndef V4_BOOTSTRAP
static uint requiredJSStackFrameSize(uint nRegisters) {
return CallData::HeaderSize() + nRegisters;
}
static uint requiredJSStackFrameSize(Function *v4Function) {
return CallData::HeaderSize() + v4Function->compiledFunction->nRegisters;
}
uint requiredJSStackFrameSize() const {
return requiredJSStackFrameSize(v4Function);
}
void setupJSFrame(Value *stackSpace, const Value &function, const Heap::ExecutionContext *scope,
const Value &thisObject, const Value &newTarget = Primitive::undefinedValue()) {
setupJSFrame(stackSpace, function, scope, thisObject, newTarget,
v4Function->nFormals, v4Function->compiledFunction->nRegisters);
}
void setupJSFrame(Value *stackSpace, const Value &function, const Heap::ExecutionContext *scope,
const Value &thisObject, const Value &newTarget, uint nFormals, uint nRegisters)
{
jsFrame = reinterpret_cast<CallData *>(stackSpace);
jsFrame->function = function;
jsFrame->context = scope->asReturnedValue();
jsFrame->accumulator = Encode::undefined();
jsFrame->thisObject = thisObject;
jsFrame->newTarget = newTarget;
uint argc = uint(originalArgumentsCount);
if (argc > nFormals)
argc = nFormals;
jsFrame->setArgc(argc);
memcpy(jsFrame->args, originalArguments, argc*sizeof(Value));
Q_STATIC_ASSERT(Encode::undefined() == 0);
memset(jsFrame->args + argc, 0, (nRegisters - argc)*sizeof(Value));
if (v4Function && v4Function->compiledFunction) {
const int firstDeadZoneRegister = v4Function->compiledFunction->firstTemporalDeadZoneRegister;
const int registerDeadZoneSize = v4Function->compiledFunction->sizeOfRegisterTemporalDeadZone;
const Value * tdzEnd = stackSpace + firstDeadZoneRegister + registerDeadZoneSize;
for (Value *v = stackSpace + firstDeadZoneRegister; v < tdzEnd; ++v)
*v = Primitive::emptyValue().asReturnedValue();
}
}
#endif
QString source() const;
QString function() const;
inline QV4::ExecutionContext *context() const {
return static_cast<ExecutionContext *>(&jsFrame->context);
}
int lineNumber() const;
inline QV4::Heap::CallContext *callContext() const {
Heap::ExecutionContext *ctx = static_cast<ExecutionContext &>(jsFrame->context).d();\
while (ctx->type != Heap::ExecutionContext::Type_CallContext)
ctx = ctx->outer;
return static_cast<Heap::CallContext *>(ctx);
}
ReturnedValue thisObject() const;
};
}
QT_END_NAMESPACE
#endif
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