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| #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> |
| #include <private/qv4calldata_p.h> |
| #include <private/qv4function_p.h> |
| |
| QT_BEGIN_NAMESPACE |
| |
| namespace QV4 { |
| |
| 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; |
| bool callerCanHandleTailCall; |
| bool pendingTailCall; |
| bool isTailCalling; |
| |
| void init(EngineBase *engine, Function *v4Function, const Value *argv, int argc, bool callerCanHandleTailCall = false) { |
| this->engine = engine; |
| |
| this->v4Function = v4Function; |
| originalArguments = argv; |
| originalArgumentsCount = argc; |
| instructionPointer = 0; |
| yield = nullptr; |
| unwindHandler = nullptr; |
| unwindLabel = nullptr; |
| unwindLevel = 0; |
| yieldIsIterator = false; |
| this->callerCanHandleTailCall = callerCanHandleTailCall; |
| pendingTailCall = false; |
| isTailCalling = false; |
| } |
| |
| void push() { |
| parent = engine->currentStackFrame; |
| engine->currentStackFrame = this; |
| savedStackTop = engine->jsStackTop; |
| } |
| |
| void pop() { |
| engine->currentStackFrame = parent; |
| engine->jsStackTop = savedStackTop; |
| } |
| |
| 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 = Value::undefinedValue()) { |
| setupJSFrame(stackSpace, function, scope, thisObject, newTarget, |
| v4Function->compiledFunction->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 = Value::emptyValue().asReturnedValue(); |
| } |
| } |
| |
| 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 |