js/xpconnect/src/XPCJSWeakReference.cpp@a63d609f5ebe (annotated)
js/xpconnect/src/XPCJSWeakReference.cpp
Thu, 15 Jan 2015 15:55:04 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 15 Jan 2015 15:55:04 +0100
- branch
- TOR_BUG_9701
- changeset 9
- a63d609f5ebe
- permissions
- -rw-r--r--
Back out 97036ab72558 which inappropriately compared turds to third parties.
| michael@0 | 1 | /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ |
| michael@0 | 2 | /* vim: set ts=8 sts=4 et sw=4 tw=99: */ |
| michael@0 | 3 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 4 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 5 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 6 | |
| michael@0 | 7 | #include "xpcprivate.h" |
| michael@0 | 8 | #include "XPCJSWeakReference.h" |
| michael@0 | 9 | |
| michael@0 | 10 | #include "nsContentUtils.h" |
| michael@0 | 11 | |
| michael@0 | 12 | using namespace JS; |
| michael@0 | 13 | |
| michael@0 | 14 | xpcJSWeakReference::xpcJSWeakReference() |
| michael@0 | 15 | { |
| michael@0 | 16 | } |
| michael@0 | 17 | |
| michael@0 | 18 | NS_IMPL_ISUPPORTS(xpcJSWeakReference, xpcIJSWeakReference) |
| michael@0 | 19 | |
| michael@0 | 20 | nsresult xpcJSWeakReference::Init(JSContext* cx, const JS::Value& object) |
| michael@0 | 21 | { |
| michael@0 | 22 | if (!object.isObject()) |
| michael@0 | 23 | return NS_OK; |
| michael@0 | 24 | |
| michael@0 | 25 | JS::RootedObject obj(cx, &object.toObject()); |
| michael@0 | 26 | |
| michael@0 | 27 | XPCCallContext ccx(NATIVE_CALLER, cx); |
| michael@0 | 28 | |
| michael@0 | 29 | // See if the object is a wrapped native that supports weak references. |
| michael@0 | 30 | nsISupports* supports = |
| michael@0 | 31 | nsXPConnect::XPConnect()->GetNativeOfWrapper(cx, obj); |
| michael@0 | 32 | nsCOMPtr<nsISupportsWeakReference> supportsWeakRef = |
| michael@0 | 33 | do_QueryInterface(supports); |
| michael@0 | 34 | if (supportsWeakRef) { |
| michael@0 | 35 | supportsWeakRef->GetWeakReference(getter_AddRefs(mReferent)); |
| michael@0 | 36 | if (mReferent) { |
| michael@0 | 37 | return NS_OK; |
| michael@0 | 38 | } |
| michael@0 | 39 | } |
| michael@0 | 40 | // If it's not a wrapped native, or it is a wrapped native that does not |
| michael@0 | 41 | // support weak references, fall back to getting a weak ref to the object. |
| michael@0 | 42 | |
| michael@0 | 43 | // See if object is a wrapped JSObject. |
| michael@0 | 44 | nsRefPtr<nsXPCWrappedJS> wrapped; |
| michael@0 | 45 | nsresult rv = nsXPCWrappedJS::GetNewOrUsed(obj, |
| michael@0 | 46 | NS_GET_IID(nsISupports), |
| michael@0 | 47 | getter_AddRefs(wrapped)); |
| michael@0 | 48 | if (!wrapped) { |
| michael@0 | 49 | NS_ERROR("can't get nsISupportsWeakReference wrapper for obj"); |
| michael@0 | 50 | return rv; |
| michael@0 | 51 | } |
| michael@0 | 52 | |
| michael@0 | 53 | return wrapped->GetWeakReference(getter_AddRefs(mReferent)); |
| michael@0 | 54 | } |
| michael@0 | 55 | |
| michael@0 | 56 | NS_IMETHODIMP |
| michael@0 | 57 | xpcJSWeakReference::Get(JSContext* aCx, MutableHandleValue aRetval) |
| michael@0 | 58 | { |
| michael@0 | 59 | aRetval.setNull(); |
| michael@0 | 60 | |
| michael@0 | 61 | if (!mReferent) { |
| michael@0 | 62 | return NS_OK; |
| michael@0 | 63 | } |
| michael@0 | 64 | |
| michael@0 | 65 | nsCOMPtr<nsISupports> supports = do_QueryReferent(mReferent); |
| michael@0 | 66 | if (!supports) { |
| michael@0 | 67 | return NS_OK; |
| michael@0 | 68 | } |
| michael@0 | 69 | |
| michael@0 | 70 | nsCOMPtr<nsIXPConnectWrappedJS> wrappedObj = do_QueryInterface(supports); |
| michael@0 | 71 | if (!wrappedObj) { |
| michael@0 | 72 | // We have a generic XPCOM object that supports weak references here. |
| michael@0 | 73 | // Wrap it and pass it out. |
| michael@0 | 74 | return nsContentUtils::WrapNative(aCx, supports, |
| michael@0 | 75 | &NS_GET_IID(nsISupports), |
| michael@0 | 76 | aRetval); |
| michael@0 | 77 | } |
| michael@0 | 78 | |
| michael@0 | 79 | JS::RootedObject obj(aCx, wrappedObj->GetJSObject()); |
| michael@0 | 80 | if (!obj) { |
| michael@0 | 81 | return NS_OK; |
| michael@0 | 82 | } |
| michael@0 | 83 | |
| michael@0 | 84 | // Most users of XPCWrappedJS don't need to worry about |
| michael@0 | 85 | // re-wrapping because things are implicitly rewrapped by |
| michael@0 | 86 | // xpcconvert. However, because we're doing this directly |
| michael@0 | 87 | // through the native call context, we need to call |
| michael@0 | 88 | // JS_WrapObject(). |
| michael@0 | 89 | if (!JS_WrapObject(aCx, &obj)) { |
| michael@0 | 90 | return NS_ERROR_FAILURE; |
| michael@0 | 91 | } |
| michael@0 | 92 | |
| michael@0 | 93 | aRetval.setObject(*obj); |
| michael@0 | 94 | return NS_OK; |
| michael@0 | 95 | } |
