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/* -*- 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/. */
/* Shared proto object for XPCWrappedNative. */
#include "xpcprivate.h"
#include "js/Object.h" // JS::SetReservedSlot
#include "pratom.h"
#include "XPCMaps.h"
using namespace mozilla;
#ifdef DEBUG
int32_t XPCWrappedNativeProto::gDEBUG_LiveProtoCount = 0;
#endif
XPCWrappedNativeProto::XPCWrappedNativeProto(XPCWrappedNativeScope* Scope,
nsIClassInfo* ClassInfo,
RefPtr<XPCNativeSet>&& Set)
: mScope(Scope),
mJSProtoObject(nullptr),
mClassInfo(ClassInfo),
mSet(std::move(Set)) {
// 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);
DeferredFinalize(mClassInfo.forget().take());
}
bool XPCWrappedNativeProto::Init(JSContext* cx, nsIXPCScriptable* scriptable) {
mScriptable = scriptable;
JS::RootedObject proto(cx, JS::GetRealmObjectPrototype(cx));
mJSProtoObject = JS_NewObjectWithGivenProto(cx, &XPC_WN_Proto_JSClass, proto);
bool success = !!mJSProtoObject;
if (success) {
JS::SetReservedSlot(mJSProtoObject, ProtoSlot, JS::PrivateValue(this));
}
return success;
}
void XPCWrappedNativeProto::JSProtoObjectFinalized(JS::GCContext* gcx,
JSObject* obj) {
MOZ_ASSERT(obj == mJSProtoObject, "huh?");
#ifdef DEBUG
// Check that this object has already been swept from the map.
ClassInfo2WrappedNativeProtoMap* map = GetScope()->GetWrappedNativeProtoMap();
MOZ_ASSERT(map->Find(mClassInfo) != this);
#endif
MOZ_ALWAYS_TRUE(GetRuntime()->GetDyingWrappedNativeProtos().append(this));
mJSProtoObject = nullptr;
}
void XPCWrappedNativeProto::JSProtoObjectMoved(JSObject* obj,
const JSObject* old) {
// Update without triggering barriers.
MOZ_ASSERT(mJSProtoObject == old);
mJSProtoObject.unbarrieredSet(obj);
}
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::SetReservedSlot(mJSProtoObject, ProtoSlot, JS::UndefinedValue());
mJSProtoObject = nullptr;
}
}
// static
XPCWrappedNativeProto* XPCWrappedNativeProto::GetNewOrUsed(
JSContext* cx, XPCWrappedNativeScope* scope, nsIClassInfo* classInfo,
nsIXPCScriptable* scriptable) {
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(cx, classInfo);
if (!set) {
return nullptr;
}
proto = new XPCWrappedNativeProto(scope, classInfo, std::move(set));
if (!proto->Init(cx, scriptable)) {
delete proto.get();
return nullptr;
}
map->Add(classInfo, proto);
return proto;
}
void XPCWrappedNativeProto::DebugDump(int16_t depth) {
#ifdef DEBUG
depth--;
XPC_LOG_ALWAYS(("XPCWrappedNativeProto @ %p", this));
XPC_LOG_INDENT();
XPC_LOG_ALWAYS(("gDEBUG_LiveProtoCount is %d", gDEBUG_LiveProtoCount));
XPC_LOG_ALWAYS(("mScope @ %p", mScope));
XPC_LOG_ALWAYS(("mJSProtoObject @ %p", mJSProtoObject.get()));
XPC_LOG_ALWAYS(("mSet @ %p", mSet.get()));
XPC_LOG_ALWAYS(("mScriptable @ %p", mScriptable.get()));
if (depth && mScriptable) {
XPC_LOG_INDENT();
XPC_LOG_ALWAYS(("mFlags of %x", mScriptable->GetScriptableFlags()));
XPC_LOG_ALWAYS(("mJSClass @ %p", mScriptable->GetJSClass()));
XPC_LOG_OUTDENT();
}
XPC_LOG_OUTDENT();
#endif
}
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