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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 QV4ENGINEBASE_P_H
#define QV4ENGINEBASE_P_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/qv4global_p.h>
#include <private/qv4runtimeapi_p.h>
QT_BEGIN_NAMESPACE
namespace QV4 {
struct CppStackFrame;
// Base class for the execution engine
struct Q_QML_EXPORT EngineBase {
CppStackFrame *currentStackFrame = nullptr;
Value *jsStackTop = nullptr;
// The JIT expects hasException and isInterrupted to be in the same 32bit word in memory.
quint8 hasException = false;
// isInterrupted is expected to be set from a different thread
#if defined(Q_ATOMIC_INT8_IS_SUPPORTED)
QAtomicInteger<quint8> isInterrupted = false;
quint16 unused = 0;
#elif defined(Q_ATOMIC_INT16_IS_SUPPORTED)
quint8 unused = 0;
QAtomicInteger<quint16> isInterrupted = false;
#else
# error V4 needs either 8bit or 16bit atomics.
#endif
quint8 isExecutingInRegExpJIT = false;
quint8 isInitialized = false;
quint8 inShutdown = false;
quint8 isGCOngoing = false; // incremental gc is ongoing (but mutator might be running)
MemoryManager *memoryManager = nullptr;
union {
const void *cppStackBase = nullptr;
struct {
qint32 callDepth;
#if QT_POINTER_SIZE == 8
quint32 padding2;
#endif
};
};
const void *cppStackLimit = nullptr;
Object *globalObject = nullptr;
Value *jsStackLimit = nullptr;
Value *jsStackBase = nullptr;
IdentifierTable *identifierTable = nullptr;
// Exception handling
Value *exceptionValue = nullptr;
enum InternalClassType {
Class_Empty,
Class_String,
Class_MemberData,
Class_SimpleArrayData,
Class_SparseArrayData,
Class_ExecutionContext,
Class_CallContext,
Class_QmlContext,
Class_Object,
Class_ArrayObject,
Class_FunctionObject,
Class_ArrowFunction,
Class_GeneratorFunction,
Class_GeneratorObject,
Class_StringObject,
Class_SymbolObject,
Class_ScriptFunction,
Class_ConstructorFunction,
Class_MemberFunction,
Class_MemberGeneratorFunction,
Class_ObjectProto,
Class_RegExp,
Class_RegExpObject,
Class_RegExpExecArray,
Class_ArgumentsObject,
Class_StrictArgumentsObject,
Class_ErrorObject,
Class_ErrorObjectWithMessage,
Class_ErrorProto,
Class_QmlContextWrapper,
Class_ProxyObject,
Class_ProxyFunctionObject,
Class_Symbol,
NClasses
};
Heap::InternalClass *classes[NClasses];
Heap::InternalClass *internalClasses(InternalClassType icType) { return classes[icType]; }
};
Q_STATIC_ASSERT(std::is_standard_layout<EngineBase>::value);
Q_STATIC_ASSERT(offsetof(EngineBase, currentStackFrame) == 0);
Q_STATIC_ASSERT(offsetof(EngineBase, jsStackTop) == offsetof(EngineBase, currentStackFrame) + QT_POINTER_SIZE);
Q_STATIC_ASSERT(offsetof(EngineBase, hasException) == offsetof(EngineBase, jsStackTop) + QT_POINTER_SIZE);
Q_STATIC_ASSERT(offsetof(EngineBase, memoryManager) == offsetof(EngineBase, hasException) + 8);
Q_STATIC_ASSERT(offsetof(EngineBase, isInterrupted) + sizeof(EngineBase::isInterrupted) <= offsetof(EngineBase, hasException) + 4);
Q_STATIC_ASSERT(offsetof(EngineBase, globalObject) % QT_POINTER_SIZE == 0);
}
QT_END_NAMESPACE
#endif
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