1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
|
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "WaiveXrayWrapper.h"
#include "WrapperFactory.h"
#include "jsapi.h"
using namespace JS;
namespace xpc {
static bool WaiveAccessors(JSContext* cx,
MutableHandle<PropertyDescriptor> desc) {
if (desc.hasGetterObject() && desc.getterObject()) {
RootedValue v(cx, JS::ObjectValue(*desc.getterObject()));
if (!WrapperFactory::WaiveXrayAndWrap(cx, &v)) {
return false;
}
desc.setGetterObject(&v.toObject());
}
if (desc.hasSetterObject() && desc.setterObject()) {
RootedValue v(cx, JS::ObjectValue(*desc.setterObject()));
if (!WrapperFactory::WaiveXrayAndWrap(cx, &v)) {
return false;
}
desc.setSetterObject(&v.toObject());
}
return true;
}
bool WaiveXrayWrapper::getOwnPropertyDescriptor(
JSContext* cx, HandleObject wrapper, HandleId id,
MutableHandle<PropertyDescriptor> desc) const {
return CrossCompartmentWrapper::getOwnPropertyDescriptor(cx, wrapper, id,
desc) &&
WrapperFactory::WaiveXrayAndWrap(cx, desc.value()) &&
WaiveAccessors(cx, desc);
}
bool WaiveXrayWrapper::get(JSContext* cx, HandleObject wrapper,
HandleValue receiver, HandleId id,
MutableHandleValue vp) const {
return CrossCompartmentWrapper::get(cx, wrapper, receiver, id, vp) &&
WrapperFactory::WaiveXrayAndWrap(cx, vp);
}
bool WaiveXrayWrapper::call(JSContext* cx, HandleObject wrapper,
const JS::CallArgs& args) const {
return CrossCompartmentWrapper::call(cx, wrapper, args) &&
WrapperFactory::WaiveXrayAndWrap(cx, args.rval());
}
bool WaiveXrayWrapper::construct(JSContext* cx, HandleObject wrapper,
const JS::CallArgs& args) const {
return CrossCompartmentWrapper::construct(cx, wrapper, args) &&
WrapperFactory::WaiveXrayAndWrap(cx, args.rval());
}
// NB: This is important as the other side of a handshake with FieldGetter. See
// nsXBLProtoImplField.cpp.
bool WaiveXrayWrapper::nativeCall(JSContext* cx, JS::IsAcceptableThis test,
JS::NativeImpl impl,
const JS::CallArgs& args) const {
return CrossCompartmentWrapper::nativeCall(cx, test, impl, args) &&
WrapperFactory::WaiveXrayAndWrap(cx, args.rval());
}
bool WaiveXrayWrapper::hasInstance(JSContext* cx, HandleObject wrapper,
MutableHandleValue v, bool* bp) const {
if (v.isObject() && WrapperFactory::IsXrayWrapper(&v.toObject())) {
// If |v| is a XrayWrapper and in the same compartment as the value
// wrapped by |wrapper|, then the Xrays of |v| would be waived upon
// calling CrossCompartmentWrapper::hasInstance. This may trigger
// getters and proxy traps of unwrapped |v|. To prevent that from
// happening, we exit early.
// |wrapper| is the right operand of "instanceof", and must either be
// a function or an object with a @@hasInstance method. We are not going
// to call @@hasInstance, so only check whether it is a function.
// This check is here for consistency with usual "instanceof" behavior,
// which throws if the right operand is not a function. Without this
// check, the "instanceof" operator would return false and potentially
// hide errors in the code that uses the "instanceof" operator.
if (!JS::IsCallable(wrapper)) {
RootedValue wrapperv(cx, JS::ObjectValue(*wrapper));
js::ReportIsNotFunction(cx, wrapperv);
return false;
}
*bp = false;
return true;
}
// Both |wrapper| and |v| have no Xrays here.
return CrossCompartmentWrapper::hasInstance(cx, wrapper, v, bp);
}
bool WaiveXrayWrapper::getPrototype(JSContext* cx, HandleObject wrapper,
MutableHandleObject protop) const {
return CrossCompartmentWrapper::getPrototype(cx, wrapper, protop) &&
(!protop || WrapperFactory::WaiveXrayAndWrap(cx, protop));
}
bool WaiveXrayWrapper::getPrototypeIfOrdinary(
JSContext* cx, HandleObject wrapper, bool* isOrdinary,
MutableHandleObject protop) const {
return CrossCompartmentWrapper::getPrototypeIfOrdinary(cx, wrapper,
isOrdinary, protop) &&
(!protop || WrapperFactory::WaiveXrayAndWrap(cx, protop));
}
} // namespace xpc
|
