diff options
Diffstat (limited to 'js/xpconnect/src/XPCWrappedNativeProto.cpp')
| -rw-r--r-- | js/xpconnect/src/XPCWrappedNativeProto.cpp | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/js/xpconnect/src/XPCWrappedNativeProto.cpp b/js/xpconnect/src/XPCWrappedNativeProto.cpp new file mode 100644 index 0000000000..d9c95a3e66 --- /dev/null +++ b/js/xpconnect/src/XPCWrappedNativeProto.cpp @@ -0,0 +1,208 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* vim: set ts=8 sts=4 et sw=4 tw=99: */ +/* 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/. */ + +/* Shared proto object for XPCWrappedNative. */ + +#include "xpcprivate.h" +#include "pratom.h" + +using namespace mozilla; + +#ifdef DEBUG +int32_t XPCWrappedNativeProto::gDEBUG_LiveProtoCount = 0; +#endif + +XPCWrappedNativeProto::XPCWrappedNativeProto(XPCWrappedNativeScope* Scope, + nsIClassInfo* ClassInfo, + already_AddRefed<XPCNativeSet>&& Set) + : mScope(Scope), + mJSProtoObject(nullptr), + mClassInfo(ClassInfo), + mSet(Set), + mScriptableInfo(nullptr) +{ + // This native object lives as long as its associated JSObject - killed + // by finalization of the JSObject (or explicitly if Init fails). + + MOZ_COUNT_CTOR(XPCWrappedNativeProto); + MOZ_ASSERT(mScope); + +#ifdef DEBUG + gDEBUG_LiveProtoCount++; +#endif +} + +XPCWrappedNativeProto::~XPCWrappedNativeProto() +{ + MOZ_ASSERT(!mJSProtoObject, "JSProtoObject still alive"); + + MOZ_COUNT_DTOR(XPCWrappedNativeProto); + +#ifdef DEBUG + gDEBUG_LiveProtoCount--; +#endif + + // Note that our weak ref to mScope is not to be trusted at this point. + + XPCNativeSet::ClearCacheEntryForClassInfo(mClassInfo); + + delete mScriptableInfo; +} + +bool +XPCWrappedNativeProto::Init(const XPCNativeScriptableCreateInfo* scriptableCreateInfo, + bool callPostCreatePrototype) +{ + AutoJSContext cx; + nsIXPCScriptable* callback = scriptableCreateInfo ? + scriptableCreateInfo->GetCallback() : + nullptr; + if (callback) { + mScriptableInfo = + XPCNativeScriptableInfo::Construct(scriptableCreateInfo); + if (!mScriptableInfo) + return false; + } + + const js::Class* jsclazz = + (mScriptableInfo && + mScriptableInfo->GetFlags().AllowPropModsToPrototype()) + ? &XPC_WN_ModsAllowed_Proto_JSClass + : &XPC_WN_NoMods_Proto_JSClass; + + JS::RootedObject global(cx, mScope->GetGlobalJSObject()); + JS::RootedObject proto(cx, JS_GetObjectPrototype(cx, global)); + mJSProtoObject = JS_NewObjectWithUniqueType(cx, js::Jsvalify(jsclazz), + proto); + + bool success = !!mJSProtoObject; + if (success) { + JS_SetPrivate(mJSProtoObject, this); + if (callPostCreatePrototype) + success = CallPostCreatePrototype(); + } + + return success; +} + +bool +XPCWrappedNativeProto::CallPostCreatePrototype() +{ + AutoJSContext cx; + + // Nothing to do if we don't have a scriptable callback. + nsIXPCScriptable* callback = mScriptableInfo ? mScriptableInfo->GetCallback() + : nullptr; + if (!callback) + return true; + + // Call the helper. This can handle being called if it's not implemented, + // so we don't have to check any sort of "want" here. See xpc_map_end.h. + nsresult rv = callback->PostCreatePrototype(cx, mJSProtoObject); + if (NS_FAILED(rv)) { + JS_SetPrivate(mJSProtoObject, nullptr); + mJSProtoObject = nullptr; + XPCThrower::Throw(rv, cx); + return false; + } + + return true; +} + +void +XPCWrappedNativeProto::JSProtoObjectFinalized(js::FreeOp* fop, JSObject* obj) +{ + MOZ_ASSERT(obj == mJSProtoObject.unbarrieredGet(), "huh?"); + + // Only remove this proto from the map if it is the one in the map. + ClassInfo2WrappedNativeProtoMap* map = GetScope()->GetWrappedNativeProtoMap(); + if (map->Find(mClassInfo) == this) + map->Remove(mClassInfo); + + GetContext()->GetDyingWrappedNativeProtoMap()->Add(this); + + mJSProtoObject.finalize(js::CastToJSFreeOp(fop)->runtime()); +} + +void +XPCWrappedNativeProto::JSProtoObjectMoved(JSObject* obj, const JSObject* old) +{ + MOZ_ASSERT(mJSProtoObject.unbarrieredGet() == old); + mJSProtoObject.init(obj); // Update without triggering barriers. +} + +void +XPCWrappedNativeProto::SystemIsBeingShutDown() +{ + // Note that the instance might receive this call multiple times + // as we walk to here from various places. + + if (mJSProtoObject) { + // short circuit future finalization + JS_SetPrivate(mJSProtoObject, nullptr); + mJSProtoObject = nullptr; + } +} + +// static +XPCWrappedNativeProto* +XPCWrappedNativeProto::GetNewOrUsed(XPCWrappedNativeScope* scope, + nsIClassInfo* classInfo, + const XPCNativeScriptableCreateInfo* scriptableCreateInfo, + bool callPostCreatePrototype) +{ + AutoJSContext cx; + MOZ_ASSERT(scope, "bad param"); + MOZ_ASSERT(classInfo, "bad param"); + + AutoMarkingWrappedNativeProtoPtr proto(cx); + ClassInfo2WrappedNativeProtoMap* map = nullptr; + + map = scope->GetWrappedNativeProtoMap(); + proto = map->Find(classInfo); + if (proto) + return proto; + + RefPtr<XPCNativeSet> set = XPCNativeSet::GetNewOrUsed(classInfo); + if (!set) + return nullptr; + + proto = new XPCWrappedNativeProto(scope, classInfo, set.forget()); + + if (!proto || !proto->Init(scriptableCreateInfo, callPostCreatePrototype)) { + delete proto.get(); + return nullptr; + } + + map->Add(classInfo, proto); + + return proto; +} + +void +XPCWrappedNativeProto::DebugDump(int16_t depth) +{ +#ifdef DEBUG + depth-- ; + XPC_LOG_ALWAYS(("XPCWrappedNativeProto @ %x", this)); + XPC_LOG_INDENT(); + XPC_LOG_ALWAYS(("gDEBUG_LiveProtoCount is %d", gDEBUG_LiveProtoCount)); + XPC_LOG_ALWAYS(("mScope @ %x", mScope)); + XPC_LOG_ALWAYS(("mJSProtoObject @ %x", mJSProtoObject.get())); + XPC_LOG_ALWAYS(("mSet @ %x", mSet.get())); + XPC_LOG_ALWAYS(("mScriptableInfo @ %x", mScriptableInfo)); + if (depth && mScriptableInfo) { + XPC_LOG_INDENT(); + XPC_LOG_ALWAYS(("mScriptable @ %x", mScriptableInfo->GetCallback())); + XPC_LOG_ALWAYS(("mFlags of %x", (uint32_t)mScriptableInfo->GetFlags())); + XPC_LOG_ALWAYS(("mJSClass @ %x", mScriptableInfo->GetJSClass())); + XPC_LOG_OUTDENT(); + } + XPC_LOG_OUTDENT(); +#endif +} + + |