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Bug 658909 - Stop doing all the crazy stuff in GetWrappedNativeOfJSObject. r=mrbkap

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This commit is contained in:
Bobby Holley 2013-03-16 22:58:14 -07:00
parent 2ed6106b47
commit 5dc76db245
1 changed files with 19 additions and 105 deletions
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124
js/xpconnect/src/XPCWrappedNative.cpp
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@ -1769,113 +1769,27 @@ XPCWrappedNative::GetWrappedNativeOfJSObject(JSContext* cx,
// *pTeaorOff must be null if pTearOff is given
NS_PRECONDITION(!pTearOff || !*pTearOff, "bad param");
JSObject* cur;
XPCWrappedNativeProto* proto = nullptr;
nsIClassInfo* protoClassInfo = nullptr;
// When an object is unwrapped (near the bottom of this function), we need
// to enter its compartment. Unfortunately, given the crazy usage of gotos,
// scoped JSAutoCompartments are pretty much impossible. So instead, we use
// a single Maybe<JSAutoCompartment>, and let anyone who wants to enter a
// compartment destroy and then reconstruct it.
Maybe<JSAutoCompartment> mac;
if (cx)
mac.construct(cx, obj);
// If we were passed a function object then we need to find the correct
// wrapper out of those that might be in the callee obj's proto chain.
if (funobj) {
JSObject* funObjParent = js::UnwrapObject(js::GetObjectParent(funobj));
funObjParent = JS_ObjectToInnerObject(cx, funObjParent);
NS_ASSERTION(funObjParent, "funobj has no parent");
js::Class* funObjParentClass = js::GetObjectClass(funObjParent);
if (IS_PROTO_CLASS(funObjParentClass)) {
NS_ASSERTION(js::GetObjectParent(funObjParent), "funobj's parent (proto) is global");
proto = (XPCWrappedNativeProto*) js::GetObjectPrivate(funObjParent);
if (proto)
protoClassInfo = proto->GetClassInfo();
} else if (IS_WRAPPER_CLASS(funObjParentClass)) {
cur = funObjParent;
goto return_wrapper;
} else if (IS_TEAROFF_CLASS(funObjParentClass)) {
NS_ASSERTION(js::GetObjectParent(funObjParent), "funobj's parent (tearoff) is global");
cur = funObjParent;
goto return_tearoff;
} else {
NS_ERROR("function object has parent of unknown class!");
return nullptr;
}
}
restart:
if (cx) {
mac.destroy();
mac.construct(cx, obj);
}
for (cur = obj; cur; ) {
// this is on two lines to make the compiler happy given the goto.
js::Class* clazz;
clazz = js::GetObjectClass(cur);
if (IS_WRAPPER_CLASS(clazz)) {
return_wrapper:
JSBool isWN = IS_WN_WRAPPER_OBJECT(cur);
XPCWrappedNative* wrapper =
isWN ? (XPCWrappedNative*) js::GetObjectPrivate(cur) : nullptr;
if (proto) {
XPCWrappedNativeProto* wrapper_proto =
isWN ? wrapper->GetProto() : GetSlimWrapperProto(cur);
if (proto != wrapper_proto &&
(!protoClassInfo || !wrapper_proto ||
protoClassInfo != wrapper_proto->GetClassInfo()))
goto next;
}
if (pobj2)
*pobj2 = isWN ? nullptr : cur;
return wrapper;
}
if (IS_TEAROFF_CLASS(clazz)) {
return_tearoff:
XPCWrappedNative* wrapper =
(XPCWrappedNative*) js::GetObjectPrivate(js::GetObjectParent(cur));
if (proto && proto != wrapper->GetProto() &&
(proto->GetScope() != wrapper->GetScope() ||
!protoClassInfo || !wrapper->GetProto() ||
protoClassInfo != wrapper->GetProto()->GetClassInfo()))
goto next;
if (pobj2)
*pobj2 = nullptr;
XPCWrappedNativeTearOff* to = (XPCWrappedNativeTearOff*) js::GetObjectPrivate(cur);
if (!to)
return nullptr;
if (pTearOff)
*pTearOff = to;
return wrapper;
}
// Unwrap any wrapper wrappers.
JSObject *unsafeObj;
unsafeObj = cx
? XPCWrapper::Unwrap(cx, cur, /* stopAtOuter = */ false)
: js::UnwrapObject(cur, /* stopAtOuter = */ false);
if (unsafeObj) {
obj = unsafeObj;
goto restart;
}
next:
if (!js::GetObjectProto(cx, cur, &cur))
return nullptr;
}
if (pobj2)
*pobj2 = nullptr;
obj = js::UnwrapObjectChecked(obj, /* stopAtOuter = */ false);
if (!obj)
return nullptr;
js::Class *clasp = js::GetObjectClass(obj);
if (IS_WRAPPER_CLASS(clasp)) {
if (IS_WN_WRAPPER_OBJECT(obj)) {
return (XPCWrappedNative*)js::GetObjectPrivate(obj);
} else {
MOZ_ASSERT(IS_SLIM_WRAPPER_OBJECT(obj));
if (pobj2)
*pobj2 = obj;
return nullptr;
}
} else if (IS_TEAROFF_CLASS(clasp)) {
if (pTearOff)
*pTearOff = (XPCWrappedNativeTearOff*)js::GetObjectPrivate(obj);
return (XPCWrappedNative*)js::GetObjectPrivate(js::GetObjectParent(obj));
}
return nullptr;
}