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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
#ifndef QMLJS_ENVIRONMENT_H
#define QMLJS_ENVIRONMENT_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 "qv4global_p.h"
#include "qv4managed_p.h"
QT_BEGIN_NAMESPACE
namespace QV4 {
namespace Heap {
#define ExecutionContextMembers(class, Member) \
Member(class, Pointer, ExecutionContext *, outer) \
Member(class, Pointer, Object *, activation)
DECLARE_HEAP_OBJECT(ExecutionContext, Base) {
DECLARE_MARKOBJECTS(ExecutionContext)
enum ContextType {
Type_GlobalContext = 0x1,
Type_WithContext = 0x2,
Type_QmlContext = 0x3,
Type_BlockContext = 0x4,
Type_CallContext = 0x5
};
void init(ContextType t)
{
Base::init();
type = t;
}
const VTable *vtable() const {
return internalClass->vtable;
}
quint32 type : 8;
quint32 nArgs : 24;
#if QT_POINTER_SIZE == 8
quint8 padding_[4];
#endif
};
Q_STATIC_ASSERT(std::is_trivial_v<ExecutionContext>);
Q_STATIC_ASSERT(sizeof(ExecutionContext) == sizeof(Base) + sizeof(ExecutionContextData) + QT_POINTER_SIZE);
Q_STATIC_ASSERT(std::is_standard_layout<ExecutionContextData>::value);
Q_STATIC_ASSERT(offsetof(ExecutionContextData, outer) == 0);
Q_STATIC_ASSERT(offsetof(ExecutionContextData, activation) == offsetof(ExecutionContextData, outer) + QT_POINTER_SIZE);
#define CallContextMembers(class, Member) \
Member(class, Pointer, FunctionObject *, function) \
Member(class, ValueArray, ValueArray, locals)
DECLARE_HEAP_OBJECT(CallContext, ExecutionContext) {
DECLARE_MARKOBJECTS(CallContext)
void init()
{
ExecutionContext::init(Type_CallContext);
}
int argc() const {
return static_cast<int>(nArgs);
}
const Value *args() const {
return locals.data() + locals.size;
}
void setArg(uint index, Value v);
template <typename BlockOrFunction>
void setupLocalTemporalDeadZone(BlockOrFunction *bof) {
for (uint i = bof->nLocals - bof->sizeOfLocalTemporalDeadZone; i < bof->nLocals; ++i)
locals.values[i] = Value::emptyValue();
}
};
Q_STATIC_ASSERT(std::is_trivial_v<CallContext>);
Q_STATIC_ASSERT(std::is_standard_layout<CallContextData>::value);
Q_STATIC_ASSERT(offsetof(CallContextData, function) == 0);
//### The following size check fails on Win8. With the ValueArray at the end of the
// CallContextMembers, it doesn't look very useful.
//#if defined(Q_PROCESSOR_ARM_32) && !defined(Q_OS_IOS)
//Q_STATIC_ASSERT(sizeof(CallContext) == sizeof(ExecutionContext) + sizeof(CallContextData) + QT_POINTER_SIZE);
//#else
//Q_STATIC_ASSERT(sizeof(CallContext) == sizeof(ExecutionContext) + sizeof(CallContextData));
//#endif
}
struct Q_QML_EXPORT ExecutionContext : public Managed
{
enum {
IsExecutionContext = true
};
V4_MANAGED(ExecutionContext, Managed)
Q_MANAGED_TYPE(ExecutionContext)
V4_INTERNALCLASS(ExecutionContext)
static Heap::CallContext *newBlockContext(QV4::CppStackFrame *frame, int blockIndex);
static Heap::CallContext *cloneBlockContext(ExecutionEngine *engine,
Heap::CallContext *callContext);
static Heap::CallContext *newCallContext(JSTypesStackFrame *frame);
Heap::ExecutionContext *newWithContext(Heap::Object *with) const;
static Heap::ExecutionContext *newCatchContext(CppStackFrame *frame, int blockIndex, Heap::String *exceptionVarName);
void createMutableBinding(String *name, bool deletable);
enum Error {
NoError,
TypeError,
RangeError
};
Error setProperty(String *name, const Value &value);
ReturnedValue getProperty(String *name);
ReturnedValue getPropertyAndBase(String *name, Value *base);
bool deleteProperty(String *name);
inline CallContext *asCallContext();
inline const CallContext *asCallContext() const;
protected:
// vtable method required for compilation
static bool virtualDeleteProperty(Managed *, PropertyKey) {
Q_UNREACHABLE();
}
};
struct Q_QML_EXPORT CallContext : public ExecutionContext
{
V4_MANAGED(CallContext, ExecutionContext)
V4_INTERNALCLASS(CallContext)
int argc() const {
return d()->argc();
}
const Value *args() const {
return d()->args();
}
};
inline CallContext *ExecutionContext::asCallContext()
{
return d()->type == Heap::ExecutionContext::Type_CallContext ? static_cast<CallContext *>(this) : nullptr;
}
inline const CallContext *ExecutionContext::asCallContext() const
{
return d()->type == Heap::ExecutionContext::Type_CallContext ? static_cast<const CallContext *>(this) : nullptr;
}
} // namespace QV4
QT_END_NAMESPACE
#endif
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