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39#ifndef QV4JSCALL_H
40#define QV4JSCALL_H
41
42//
43// W A R N I N G
44// -------------
45//
46// This file is not part of the Qt API. It exists purely as an
47// implementation detail. This header file may change from version to
48// version without notice, or even be removed.
49//
50// We mean it.
51//
52
53#include "qv4object_p.h"
54#include "qv4function_p.h"
55#include "qv4functionobject_p.h"
56#include "qv4context_p.h"
57#include "qv4scopedvalue_p.h"
58#include "qv4stackframe_p.h"
59
60QT_BEGIN_NAMESPACE
61
62namespace QV4 {
63
64struct JSCallData {
65 JSCallData(const Scope &scope, int argc = 0, const Value *argv = nullptr, const Value *thisObject = nullptr)
66 : scope(scope), argc(argc)
67 {
68 if (thisObject)
69 this->thisObject = const_cast<Value *>(thisObject);
70 else
71 this->thisObject = scope.alloc();
72 if (argv)
73 this->args = const_cast<Value *>(argv);
74 else
75 this->args = scope.alloc(argc);
76 }
77
78 JSCallData *operator->() {
79 return this;
80 }
81
82 CallData *callData(const FunctionObject *f = nullptr) const {
83 int size = int(offsetof(QV4::CallData, args)/sizeof(QV4::Value)) + argc;
84 CallData *ptr = reinterpret_cast<CallData *>(scope.alloc<Scope::Uninitialized>(size));
85 ptr->function = Encode::undefined();
86 ptr->context = Encode::undefined();
87 ptr->accumulator = Encode::undefined();
88 ptr->thisObject = thisObject->asReturnedValue();
89 ptr->newTarget = Encode::undefined();
90 ptr->setArgc(argc);
91 if (argc)
92 memcpy(ptr->args, args, argc*sizeof(Value));
93 if (f)
94 ptr->function = f->asReturnedValue();
95 return ptr;
96 }
97 const Scope &scope;
98 int argc;
99 Value *args;
100 Value *thisObject;
101};
102
103inline
104ReturnedValue FunctionObject::callAsConstructor(const JSCallData &data) const
105{
106 return callAsConstructor(data.args, data.argc, this);
107}
108
109inline
110ReturnedValue FunctionObject::call(const JSCallData &data) const
111{
112 return call(data.thisObject, data.args, data.argc);
113}
114
115
116struct ScopedStackFrame {
117 Scope &scope;
118 CppStackFrame frame;
119
120 ScopedStackFrame(Scope &scope, Heap::ExecutionContext *context)
121 : scope(scope)
122 {
123 frame.parent = scope.engine->currentStackFrame;
124 if (!context)
125 return;
126 frame.jsFrame = reinterpret_cast<CallData *>(scope.alloc(sizeof(CallData)/sizeof(Value)));
127 frame.jsFrame->context = context;
128 frame.v4Function = frame.parent ? frame.parent->v4Function : nullptr;
129 scope.engine->currentStackFrame = &frame;
130 }
131 ~ScopedStackFrame() {
132 scope.engine->currentStackFrame = frame.parent;
133 }
134};
135
136}
137
138QT_END_NAMESPACE
139
140#endif // QV4JSCALL_H
141