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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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
}
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