mirror of
https://github.com/classilla/tenfourfox.git
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229 lines
6.9 KiB
C++
229 lines
6.9 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* vim: set ts=8 sts=4 et sw=4 tw=99: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* Shared proto object for XPCWrappedNative. */
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#include "xpcprivate.h"
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#include "pratom.h"
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using namespace mozilla;
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#ifdef DEBUG
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int32_t XPCWrappedNativeProto::gDEBUG_LiveProtoCount = 0;
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#endif
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XPCWrappedNativeProto::XPCWrappedNativeProto(XPCWrappedNativeScope* Scope,
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nsIClassInfo* ClassInfo,
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uint32_t ClassInfoFlags,
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XPCNativeSet* Set)
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: mScope(Scope),
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mJSProtoObject(nullptr),
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mClassInfo(ClassInfo),
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mClassInfoFlags(ClassInfoFlags),
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mSet(Set),
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mScriptableInfo(nullptr)
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{
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// This native object lives as long as its associated JSObject - killed
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// by finalization of the JSObject (or explicitly if Init fails).
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MOZ_COUNT_CTOR(XPCWrappedNativeProto);
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MOZ_ASSERT(mScope);
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#ifdef DEBUG
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PR_ATOMIC_INCREMENT(&gDEBUG_LiveProtoCount);
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#endif
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}
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XPCWrappedNativeProto::~XPCWrappedNativeProto()
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{
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MOZ_ASSERT(!mJSProtoObject, "JSProtoObject still alive");
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MOZ_COUNT_DTOR(XPCWrappedNativeProto);
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#ifdef DEBUG
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PR_ATOMIC_DECREMENT(&gDEBUG_LiveProtoCount);
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#endif
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// Note that our weak ref to mScope is not to be trusted at this point.
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XPCNativeSet::ClearCacheEntryForClassInfo(mClassInfo);
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delete mScriptableInfo;
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}
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bool
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XPCWrappedNativeProto::Init(const XPCNativeScriptableCreateInfo* scriptableCreateInfo,
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bool callPostCreatePrototype)
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{
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AutoJSContext cx;
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nsIXPCScriptable* callback = scriptableCreateInfo ?
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scriptableCreateInfo->GetCallback() :
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nullptr;
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if (callback) {
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mScriptableInfo =
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XPCNativeScriptableInfo::Construct(scriptableCreateInfo);
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if (!mScriptableInfo)
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return false;
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}
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const js::Class* jsclazz;
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if (mScriptableInfo) {
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const XPCNativeScriptableFlags& flags(mScriptableInfo->GetFlags());
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if (flags.AllowPropModsToPrototype()) {
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jsclazz = flags.WantCall() ?
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&XPC_WN_ModsAllowed_WithCall_Proto_JSClass :
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&XPC_WN_ModsAllowed_NoCall_Proto_JSClass;
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} else {
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jsclazz = flags.WantCall() ?
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&XPC_WN_NoMods_WithCall_Proto_JSClass :
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&XPC_WN_NoMods_NoCall_Proto_JSClass;
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}
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} else {
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jsclazz = &XPC_WN_NoMods_NoCall_Proto_JSClass;
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}
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JS::RootedObject global(cx, mScope->GetGlobalJSObject());
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JS::RootedObject proto(cx, JS_GetObjectPrototype(cx, global));
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mJSProtoObject = JS_NewObjectWithUniqueType(cx, js::Jsvalify(jsclazz),
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proto);
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bool success = !!mJSProtoObject;
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if (success) {
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JS_SetPrivate(mJSProtoObject, this);
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if (callPostCreatePrototype)
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success = CallPostCreatePrototype();
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}
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return success;
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}
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bool
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XPCWrappedNativeProto::CallPostCreatePrototype()
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{
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AutoJSContext cx;
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// Nothing to do if we don't have a scriptable callback.
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nsIXPCScriptable* callback = mScriptableInfo ? mScriptableInfo->GetCallback()
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: nullptr;
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if (!callback)
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return true;
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// Call the helper. This can handle being called if it's not implemented,
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// so we don't have to check any sort of "want" here. See xpc_map_end.h.
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nsresult rv = callback->PostCreatePrototype(cx, mJSProtoObject);
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if (NS_FAILED(rv)) {
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JS_SetPrivate(mJSProtoObject, nullptr);
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mJSProtoObject = nullptr;
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XPCThrower::Throw(rv, cx);
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return false;
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}
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return true;
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}
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void
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XPCWrappedNativeProto::JSProtoObjectFinalized(js::FreeOp* fop, JSObject* obj)
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{
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MOZ_ASSERT(obj == mJSProtoObject, "huh?");
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// Only remove this proto from the map if it is the one in the map.
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ClassInfo2WrappedNativeProtoMap* map = GetScope()->GetWrappedNativeProtoMap();
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if (map->Find(mClassInfo) == this)
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map->Remove(mClassInfo);
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GetRuntime()->GetDetachedWrappedNativeProtoMap()->Remove(this);
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GetRuntime()->GetDyingWrappedNativeProtoMap()->Add(this);
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mJSProtoObject.finalize(js::CastToJSFreeOp(fop)->runtime());
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}
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void
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XPCWrappedNativeProto::JSProtoObjectMoved(JSObject* obj, const JSObject* old)
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{
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MOZ_ASSERT(mJSProtoObject == old);
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mJSProtoObject.init(obj); // Update without triggering barriers.
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}
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void
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XPCWrappedNativeProto::SystemIsBeingShutDown()
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{
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// Note that the instance might receive this call multiple times
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// as we walk to here from various places.
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if (mJSProtoObject) {
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// short circuit future finalization
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JS_SetPrivate(mJSProtoObject, nullptr);
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mJSProtoObject = nullptr;
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}
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}
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// static
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XPCWrappedNativeProto*
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XPCWrappedNativeProto::GetNewOrUsed(XPCWrappedNativeScope* scope,
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nsIClassInfo* classInfo,
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const XPCNativeScriptableCreateInfo* scriptableCreateInfo,
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bool callPostCreatePrototype)
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{
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AutoJSContext cx;
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MOZ_ASSERT(scope, "bad param");
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MOZ_ASSERT(classInfo, "bad param");
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AutoMarkingWrappedNativeProtoPtr proto(cx);
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ClassInfo2WrappedNativeProtoMap* map = nullptr;
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uint32_t ciFlags;
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if (NS_FAILED(classInfo->GetFlags(&ciFlags)))
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ciFlags = 0;
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map = scope->GetWrappedNativeProtoMap();
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proto = map->Find(classInfo);
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if (proto)
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return proto;
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AutoMarkingNativeSetPtr set(cx);
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set = XPCNativeSet::GetNewOrUsed(classInfo);
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if (!set)
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return nullptr;
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proto = new XPCWrappedNativeProto(scope, classInfo, ciFlags, set);
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if (!proto || !proto->Init(scriptableCreateInfo, callPostCreatePrototype)) {
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delete proto.get();
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return nullptr;
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}
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map->Add(classInfo, proto);
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return proto;
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}
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void
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XPCWrappedNativeProto::DebugDump(int16_t depth)
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{
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#ifdef DEBUG
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depth-- ;
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XPC_LOG_ALWAYS(("XPCWrappedNativeProto @ %x", this));
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XPC_LOG_INDENT();
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XPC_LOG_ALWAYS(("gDEBUG_LiveProtoCount is %d", gDEBUG_LiveProtoCount));
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XPC_LOG_ALWAYS(("mScope @ %x", mScope));
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XPC_LOG_ALWAYS(("mJSProtoObject @ %x", mJSProtoObject.get()));
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XPC_LOG_ALWAYS(("mSet @ %x", mSet));
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XPC_LOG_ALWAYS(("mScriptableInfo @ %x", mScriptableInfo));
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if (depth && mScriptableInfo) {
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XPC_LOG_INDENT();
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XPC_LOG_ALWAYS(("mScriptable @ %x", mScriptableInfo->GetCallback()));
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XPC_LOG_ALWAYS(("mFlags of %x", (uint32_t)mScriptableInfo->GetFlags()));
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XPC_LOG_ALWAYS(("mJSClass @ %x", mScriptableInfo->GetJSClass()));
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XPC_LOG_OUTDENT();
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}
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XPC_LOG_OUTDENT();
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#endif
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}
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