| /**************************************************************************** |
| ** |
| ** Copyright (C) 2016 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 |
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| ** GNU Lesser General Public License Usage |
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| ** |
| ** 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 |
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| ** $QT_END_LICENSE$ |
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| ****************************************************************************/ |
| #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< ExecutionContext >::value); |
| 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< CallContext >::value); |
| 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(QV4::CppStackFrame *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 |