The Tor Browser: js/xpconnect/loader/mozJSComponentLoader.cpp@a63d609f5ebe (annotated)

js/xpconnect/loader/mozJSComponentLoader.cpp@a63d609f5ebe (annotated)

js/xpconnect/loader/mozJSComponentLoader.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.

 /* -*- 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/. */
 #include "mozilla/Attributes.h"
 #ifdef MOZ_LOGGING
 #define FORCE_PR_LOG
 #endif
 #include <cstdarg>
 #include "prlog.h"
 #ifdef ANDROID
 #include <android/log.h>
 #endif
 #ifdef XP_WIN
 #include <windows.h>
 #endif
 #include "jsapi.h"
 #include "nsCOMPtr.h"
 #include "nsAutoPtr.h"
 #include "nsIComponentManager.h"
 #include "mozilla/Module.h"
 #include "nsIFile.h"
 #include "mozJSComponentLoader.h"
 #include "mozJSLoaderUtils.h"
 #include "nsIJSRuntimeService.h"
 #include "nsIXPConnect.h"
 #include "nsIObserverService.h"
 #include "nsIScriptSecurityManager.h"
 #include "nsIFileURL.h"
 #include "nsIJARURI.h"
 #include "nsNetUtil.h"
 #include "nsDOMBlobBuilder.h"
 #include "jsprf.h"
 #include "nsJSPrincipals.h"
 #include "xpcprivate.h"
 #include "xpcpublic.h"
 #include "nsContentUtils.h"
 #include "nsCxPusher.h"
 #include "WrapperFactory.h"
 #include "mozilla/scache/StartupCache.h"
 #include "mozilla/scache/StartupCacheUtils.h"
 #include "mozilla/Preferences.h"
 #include "js/OldDebugAPI.h"
 using namespace mozilla;
 using namespace mozilla::scache;
 using namespace xpc;
 using namespace JS;
 // This JSClass exists to trick silly code that expects toString()ing the
 // global in a component scope to return something with "BackstagePass" in it
 // to continue working.
 static const JSClass kFakeBackstagePassJSClass =
 {
     "FakeBackstagePass",
 ,
     JS_PropertyStub,
     JS_DeletePropertyStub,
     JS_PropertyStub,
     JS_StrictPropertyStub,
     JS_EnumerateStub,
     JS_ResolveStub,
     JS_ConvertStub
 };
 static const char kJSRuntimeServiceContractID[] = "@mozilla.org/js/xpc/RuntimeService;1";
 static const char kXPConnectServiceContractID[] = "@mozilla.org/js/xpc/XPConnect;1";
 static const char kObserverServiceContractID[] = "@mozilla.org/observer-service;1";
 static const char kJSCachePrefix[] = "jsloader";
 #define HAVE_PR_MEMMAP
 /**
  * Buffer sizes for serialization and deserialization of scripts.
  * FIXME: bug #411579 (tune this macro!) Last updated: Jan 2008
  */
 #define XPC_SERIALIZATION_BUFFER_SIZE   (64 * 1024)
 #define XPC_DESERIALIZATION_BUFFER_SIZE (12 * 8192)
 #ifdef PR_LOGGING
 // NSPR_LOG_MODULES=JSComponentLoader:5
 static PRLogModuleInfo *gJSCLLog;
 #endif
 #define LOG(args) PR_LOG(gJSCLLog, PR_LOG_DEBUG, args)
 // Components.utils.import error messages
 #define ERROR_SCOPE_OBJ "%s - Second argument must be an object."
 #define ERROR_NOT_PRESENT "%s - EXPORTED_SYMBOLS is not present."
 #define ERROR_NOT_AN_ARRAY "%s - EXPORTED_SYMBOLS is not an array."
 #define ERROR_GETTING_ARRAY_LENGTH "%s - Error getting array length of EXPORTED_SYMBOLS."
 #define ERROR_ARRAY_ELEMENT "%s - EXPORTED_SYMBOLS[%d] is not a string."
 #define ERROR_GETTING_SYMBOL "%s - Could not get symbol '%s'."
 #define ERROR_SETTING_SYMBOL "%s - Could not set symbol '%s' on target object."
 static bool
 Dump(JSContext *cx, unsigned argc, Value *vp)
 {
     CallArgs args = CallArgsFromVp(argc, vp);
     if (args.length() == 0)
         return true;
     JSString *str = JS::ToString(cx, args[0]);
     if (!str)
         return false;
     size_t length;
     const jschar *chars = JS_GetStringCharsAndLength(cx, str, &length);
     if (!chars)
         return false;
     NS_ConvertUTF16toUTF8 utf8str(reinterpret_cast<const char16_t*>(chars),
                                   length);
 #ifdef ANDROID
     __android_log_print(ANDROID_LOG_INFO, "Gecko", "%s", utf8str.get());
 #endif
 #ifdef XP_WIN
     if (IsDebuggerPresent()) {
       OutputDebugStringW(reinterpret_cast<const wchar_t*>(chars));
     }
 #endif
     fputs(utf8str.get(), stdout);
     fflush(stdout);
     return true;
 }
 static bool
 Debug(JSContext *cx, unsigned argc, jsval *vp)
 {
 #ifdef DEBUG
     return Dump(cx, argc, vp);
 #else
     return true;
 #endif
 }
 static bool
 File(JSContext *cx, unsigned argc, Value *vp)
 {
     CallArgs args = CallArgsFromVp(argc, vp);
     if (args.length() == 0) {
         XPCThrower::Throw(NS_ERROR_UNEXPECTED, cx);
         return false;
     }
     nsCOMPtr<nsISupports> native;
     nsresult rv = nsDOMMultipartFile::NewFile(getter_AddRefs(native));
     if (NS_FAILED(rv)) {
         XPCThrower::Throw(rv, cx);
         return false;
     }
     nsCOMPtr<nsIJSNativeInitializer> initializer = do_QueryInterface(native);
     MOZ_ASSERT(initializer);
     rv = initializer->Initialize(nullptr, cx, nullptr, args);
     if (NS_FAILED(rv)) {
         XPCThrower::Throw(rv, cx);
         return false;
     }
     nsXPConnect *xpc = nsXPConnect::XPConnect();
     JSObject *glob = CurrentGlobalOrNull(cx);
     nsCOMPtr<nsIXPConnectJSObjectHolder> holder;
     rv = xpc->WrapNativeToJSVal(cx, glob, native, nullptr,
                                 &NS_GET_IID(nsISupports),
                                 true, args.rval());
     if (NS_FAILED(rv)) {
         XPCThrower::Throw(rv, cx);
         return false;
     }
     return true;
 }
 static bool
 Blob(JSContext *cx, unsigned argc, Value *vp)
 {
     CallArgs args = CallArgsFromVp(argc, vp);
     nsCOMPtr<nsISupports> native;
     nsresult rv = nsDOMMultipartFile::NewBlob(getter_AddRefs(native));
     if (NS_FAILED(rv)) {
         XPCThrower::Throw(rv, cx);
         return false;
     }
     nsCOMPtr<nsIJSNativeInitializer> initializer = do_QueryInterface(native);
     MOZ_ASSERT(initializer);
     rv = initializer->Initialize(nullptr, cx, nullptr, args);
     if (NS_FAILED(rv)) {
         XPCThrower::Throw(rv, cx);
         return false;
     }
     nsXPConnect *xpc = nsXPConnect::XPConnect();
     JSObject *glob = CurrentGlobalOrNull(cx);
     nsCOMPtr<nsIXPConnectJSObjectHolder> holder;
     rv = xpc->WrapNativeToJSVal(cx, glob, native, nullptr,
                                 &NS_GET_IID(nsISupports),
                                 true, args.rval());
     if (NS_FAILED(rv)) {
         XPCThrower::Throw(rv, cx);
         return false;
     }
     return true;
 }
 static const JSFunctionSpec gGlobalFun[] = {
     JS_FS("dump",    Dump,   1,0),
     JS_FS("debug",   Debug,  1,0),
     JS_FS("atob",    Atob,   1,0),
     JS_FS("btoa",    Btoa,   1,0),
     JS_FS("File",    File,   1,JSFUN_CONSTRUCTOR),
     JS_FS("Blob",    Blob,   2,JSFUN_CONSTRUCTOR),
     JS_FS_END
 };
 class MOZ_STACK_CLASS JSCLContextHelper
 {
 public:
     JSCLContextHelper(JSContext* aCx);
     ~JSCLContextHelper();
     void reportErrorAfterPop(char *buf);
     operator JSContext*() const {return mContext;}
 private:
     JSContext* mContext;
     nsCxPusher mPusher;
     char*      mBuf;
     // prevent copying and assignment
     JSCLContextHelper(const JSCLContextHelper &) MOZ_DELETE;
     const JSCLContextHelper& operator=(const JSCLContextHelper &) MOZ_DELETE;
 };
 class JSCLAutoErrorReporterSetter
 {
 public:
     JSCLAutoErrorReporterSetter(JSContext* cx, JSErrorReporter reporter)
         {mContext = cx; mOldReporter = JS_SetErrorReporter(cx, reporter);}
     ~JSCLAutoErrorReporterSetter()
         {JS_SetErrorReporter(mContext, mOldReporter);}
 private:
     JSContext* mContext;
     JSErrorReporter mOldReporter;
     JSCLAutoErrorReporterSetter(const JSCLAutoErrorReporterSetter &) MOZ_DELETE;
     const JSCLAutoErrorReporterSetter& operator=(const JSCLAutoErrorReporterSetter &) MOZ_DELETE;
 };
 static nsresult
 ReportOnCaller(JSContext *callerContext,
                const char *format, ...) {
     if (!callerContext) {
         return NS_ERROR_FAILURE;
     }
     va_list ap;
     va_start(ap, format);
     char *buf = JS_vsmprintf(format, ap);
     if (!buf) {
         return NS_ERROR_OUT_OF_MEMORY;
     }
     JS_ReportError(callerContext, buf);
     JS_smprintf_free(buf);
     return NS_OK;
 }
 static nsresult
 ReportOnCaller(JSCLContextHelper &helper,
                const char *format, ...)
 {
     va_list ap;
     va_start(ap, format);
     char *buf = JS_vsmprintf(format, ap);
     if (!buf) {
         return NS_ERROR_OUT_OF_MEMORY;
     }
     helper.reportErrorAfterPop(buf);
     return NS_OK;
 }
 mozJSComponentLoader::mozJSComponentLoader()
     : mRuntime(nullptr),
       mContext(nullptr),
       mModules(32),
       mImports(32),
       mInProgressImports(32),
       mThisObjects(32),
       mInitialized(false),
       mReuseLoaderGlobal(false)
 {
     MOZ_ASSERT(!sSelf, "mozJSComponentLoader should be a singleton");
 #ifdef PR_LOGGING
     if (!gJSCLLog) {
         gJSCLLog = PR_NewLogModule("JSComponentLoader");
     }
 #endif
     sSelf = this;
 }
 mozJSComponentLoader::~mozJSComponentLoader()
 {
     if (mInitialized) {
         NS_ERROR("'xpcom-shutdown-loaders' was not fired before cleaning up mozJSComponentLoader");
         UnloadModules();
     }
     sSelf = nullptr;
 }
 mozJSComponentLoader*
 mozJSComponentLoader::sSelf;
 NS_IMPL_ISUPPORTS(mozJSComponentLoader,
                   mozilla::ModuleLoader,
                   xpcIJSModuleLoader,
                   nsIObserver)
 nsresult
 mozJSComponentLoader::ReallyInit()
 {
     nsresult rv;
     mReuseLoaderGlobal = Preferences::GetBool("jsloader.reuseGlobal");
     // XXXkhuey B2G child processes have some sort of preferences race that
     // results in getting the wrong value.
 #ifdef MOZ_B2G
     mReuseLoaderGlobal = true;
 #endif
     /*
      * Get the JSRuntime from the runtime svc, if possible.
      * We keep a reference around, because it's a Bad Thing if the runtime
      * service gets shut down before we're done.  Bad!
      */
     mRuntimeService = do_GetService(kJSRuntimeServiceContractID, &rv);
     if (NS_FAILED(rv) ||
         NS_FAILED(rv = mRuntimeService->GetRuntime(&mRuntime)))
         return rv;
     // Create our compilation context.
     mContext = JS_NewContext(mRuntime, 256);
     if (!mContext)
         return NS_ERROR_OUT_OF_MEMORY;
     nsCOMPtr<nsIScriptSecurityManager> secman =
         do_GetService(NS_SCRIPTSECURITYMANAGER_CONTRACTID);
     if (!secman)
         return NS_ERROR_FAILURE;
     rv = secman->GetSystemPrincipal(getter_AddRefs(mSystemPrincipal));
     if (NS_FAILED(rv) || !mSystemPrincipal)
         return NS_ERROR_FAILURE;
     nsCOMPtr<nsIObserverService> obsSvc =
         do_GetService(kObserverServiceContractID, &rv);
     NS_ENSURE_SUCCESS(rv, rv);
     rv = obsSvc->AddObserver(this, "xpcom-shutdown-loaders", false);
     NS_ENSURE_SUCCESS(rv, rv);
     mInitialized = true;
     return NS_OK;
 }
 const mozilla::Module*
 mozJSComponentLoader::LoadModule(FileLocation &aFile)
 {
     nsCOMPtr<nsIFile> file = aFile.GetBaseFile();
     nsCString spec;
     aFile.GetURIString(spec);
     nsCOMPtr<nsIURI> uri;
     nsresult rv = NS_NewURI(getter_AddRefs(uri), spec);
     if (NS_FAILED(rv))
         return nullptr;
     if (!mInitialized) {
         rv = ReallyInit();
         if (NS_FAILED(rv))
             return nullptr;
     }
     ModuleEntry* mod;
     if (mModules.Get(spec, &mod))
     return mod;
     nsAutoPtr<ModuleEntry> entry(new ModuleEntry(mContext));
     JSAutoRequest ar(mContext);
     RootedValue dummy(mContext);
     rv = ObjectForLocation(file, uri, &entry->obj, &entry->thisObjectKey,
                            &entry->location, false, &dummy);
     if (NS_FAILED(rv)) {
         return nullptr;
     }
     nsCOMPtr<nsIXPConnect> xpc = do_GetService(kXPConnectServiceContractID,
                                                &rv);
     if (NS_FAILED(rv))
         return nullptr;
     nsCOMPtr<nsIComponentManager> cm;
     rv = NS_GetComponentManager(getter_AddRefs(cm));
     if (NS_FAILED(rv))
         return nullptr;
     JSCLContextHelper cx(mContext);
     JSAutoCompartment ac(cx, entry->obj);
     nsCOMPtr<nsIXPConnectJSObjectHolder> cm_holder;
     rv = xpc->WrapNative(cx, entry->obj, cm,
                          NS_GET_IID(nsIComponentManager),
                          getter_AddRefs(cm_holder));
     if (NS_FAILED(rv)) {
         return nullptr;
     }
     JSObject* cm_jsobj = cm_holder->GetJSObject();
     if (!cm_jsobj) {
         return nullptr;
     }
     nsCOMPtr<nsIXPConnectJSObjectHolder> file_holder;
     RootedObject entryObj(cx, entry->obj);
     rv = xpc->WrapNative(cx, entryObj, file,
                          NS_GET_IID(nsIFile),
                          getter_AddRefs(file_holder));
     if (NS_FAILED(rv)) {
         return nullptr;
     }
     JSObject* file_jsobj = file_holder->GetJSObject();
     if (!file_jsobj) {
         return nullptr;
     }
     JSCLAutoErrorReporterSetter aers(cx, xpc::SystemErrorReporter);
     RootedValue NSGetFactory_val(cx);
     if (!JS_GetProperty(cx, entryObj, "NSGetFactory", &NSGetFactory_val) ||
         JSVAL_IS_VOID(NSGetFactory_val)) {
         return nullptr;
     }
     if (JS_TypeOfValue(cx, NSGetFactory_val) != JSTYPE_FUNCTION) {
         nsAutoCString spec;
         uri->GetSpec(spec);
         JS_ReportError(cx, "%s has NSGetFactory property that is not a function",
                        spec.get());
         return nullptr;
     }
     RootedObject jsGetFactoryObj(cx);
     if (!JS_ValueToObject(cx, NSGetFactory_val, &jsGetFactoryObj) ||
         !jsGetFactoryObj) {
         /* XXX report error properly */
         return nullptr;
     }
     rv = xpc->WrapJS(cx, jsGetFactoryObj,
                      NS_GET_IID(xpcIJSGetFactory), getter_AddRefs(entry->getfactoryobj));
     if (NS_FAILED(rv)) {
         /* XXX report error properly */
 #ifdef DEBUG
         fprintf(stderr, "mJCL: couldn't get nsIModule from jsval\n");
 #endif
         return nullptr;
     }
     // Cache this module for later
     mModules.Put(spec, entry);
     // Set the location information for the new global, so that tools like
     // about:memory may use that information
     if (!mReuseLoaderGlobal) {
         xpc::SetLocationForGlobal(entryObj, spec);
     }
     // The hash owns the ModuleEntry now, forget about it
     return entry.forget();
 }
 nsresult
 mozJSComponentLoader::FindTargetObject(JSContext* aCx,
                                        MutableHandleObject aTargetObject)
 {
     aTargetObject.set(nullptr);
     RootedObject targetObject(aCx);
     if (mReuseLoaderGlobal) {
         JSScript* script =
             js::GetOutermostEnclosingFunctionOfScriptedCaller(aCx);
         if (script) {
             targetObject = mThisObjects.Get(script);
         }
     }
     // The above could fail, even if mReuseLoaderGlobal, if the scripted
     // caller is not a component/JSM (it could be a DOM scope, for
     // instance).
     if (!targetObject) {
         // Our targetObject is the caller's global object. Let's get it.
         nsresult rv;
         nsCOMPtr<nsIXPConnect> xpc =
             do_GetService(kXPConnectServiceContractID, &rv);
         NS_ENSURE_SUCCESS(rv, rv);
         nsAXPCNativeCallContext *cc = nullptr;
         rv = xpc->GetCurrentNativeCallContext(&cc);
         NS_ENSURE_SUCCESS(rv, rv);
         nsCOMPtr<nsIXPConnectWrappedNative> wn;
         rv = cc->GetCalleeWrapper(getter_AddRefs(wn));
         NS_ENSURE_SUCCESS(rv, rv);
         targetObject = wn->GetJSObject();
         if (!targetObject) {
             NS_ERROR("null calling object");
             return NS_ERROR_FAILURE;
         }
         targetObject = JS_GetGlobalForObject(aCx, targetObject);
     }
     aTargetObject.set(targetObject);
     return NS_OK;
 }
 void
 mozJSComponentLoader::NoteSubScript(HandleScript aScript, HandleObject aThisObject)
 {
   if (!mInitialized && NS_FAILED(ReallyInit())) {
       MOZ_CRASH();
   }
   if (js::GetObjectJSClass(aThisObject) == &kFakeBackstagePassJSClass) {
     mThisObjects.Put(aScript, aThisObject);
   }
 }
 /* static */ size_t
 mozJSComponentLoader::DataEntrySizeOfExcludingThis(const nsACString& aKey,
                                                    ModuleEntry* const& aData,
                                                    MallocSizeOf aMallocSizeOf, void*)
 {
     return aKey.SizeOfExcludingThisIfUnshared(aMallocSizeOf) +
         aData->SizeOfIncludingThis(aMallocSizeOf);
 }
 /* static */ size_t
 mozJSComponentLoader::ClassEntrySizeOfExcludingThis(const nsACString& aKey,
                                                     const nsAutoPtr<ModuleEntry>& aData,
                                                     MallocSizeOf aMallocSizeOf, void*)
 {
     return aKey.SizeOfExcludingThisIfUnshared(aMallocSizeOf) +
         aData->SizeOfIncludingThis(aMallocSizeOf);
 }
 size_t
 mozJSComponentLoader::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf)
 {
     size_t amount = aMallocSizeOf(this);
     amount += mModules.SizeOfExcludingThis(DataEntrySizeOfExcludingThis, aMallocSizeOf);
     amount += mImports.SizeOfExcludingThis(ClassEntrySizeOfExcludingThis, aMallocSizeOf);
     amount += mInProgressImports.SizeOfExcludingThis(DataEntrySizeOfExcludingThis, aMallocSizeOf);
     amount += mThisObjects.SizeOfExcludingThis(nullptr, aMallocSizeOf);
     return amount;
 }
 // Some stack based classes for cleaning up on early return
 #ifdef HAVE_PR_MEMMAP
 class FileAutoCloser
 {
  public:
     explicit FileAutoCloser(PRFileDesc *file) : mFile(file) {}
     ~FileAutoCloser() { PR_Close(mFile); }
  private:
     PRFileDesc *mFile;
 };
 class FileMapAutoCloser
 {
  public:
     explicit FileMapAutoCloser(PRFileMap *map) : mMap(map) {}
     ~FileMapAutoCloser() { PR_CloseFileMap(mMap); }
  private:
     PRFileMap *mMap;
 };
 #else
 class ANSIFileAutoCloser
 {
  public:
     explicit ANSIFileAutoCloser(FILE *file) : mFile(file) {}
     ~ANSIFileAutoCloser() { fclose(mFile); }
  private:
     FILE *mFile;
 };
 #endif
 JSObject*
 mozJSComponentLoader::PrepareObjectForLocation(JSCLContextHelper& aCx,
                                                nsIFile *aComponentFile,
                                                nsIURI *aURI,
                                                bool aReuseLoaderGlobal,
                                                bool *aRealFile)
 {
     nsCOMPtr<nsIXPConnectJSObjectHolder> holder;
     if (aReuseLoaderGlobal) {
         holder = mLoaderGlobal;
     }
     nsresult rv = NS_OK;
     nsCOMPtr<nsIXPConnect> xpc =
         do_GetService(kXPConnectServiceContractID, &rv);
     NS_ENSURE_SUCCESS(rv, nullptr);
     bool createdNewGlobal = false;
     if (!mLoaderGlobal) {
         nsRefPtr<BackstagePass> backstagePass;
         rv = NS_NewBackstagePass(getter_AddRefs(backstagePass));
         NS_ENSURE_SUCCESS(rv, nullptr);
         CompartmentOptions options;
         options.setZone(SystemZone)
                .setVersion(JSVERSION_LATEST);
         // Defer firing OnNewGlobalObject until after the __URI__ property has
         // been defined so the JS debugger can tell what module the global is
         // for
         rv = xpc->InitClassesWithNewWrappedGlobal(aCx,
                                                   static_cast<nsIGlobalObject *>(backstagePass),
                                                   mSystemPrincipal,
                                                   nsIXPConnect::DONT_FIRE_ONNEWGLOBALHOOK,
                                                   options,
                                                   getter_AddRefs(holder));
         NS_ENSURE_SUCCESS(rv, nullptr);
         createdNewGlobal = true;
         RootedObject global(aCx, holder->GetJSObject());
         NS_ENSURE_TRUE(global, nullptr);
         backstagePass->SetGlobalObject(global);
         JSAutoCompartment ac(aCx, global);
         if (!JS_DefineFunctions(aCx, global, gGlobalFun) ||
             !JS_DefineProfilingFunctions(aCx, global)) {
             return nullptr;
         }
         if (aReuseLoaderGlobal) {
             mLoaderGlobal = holder;
         }
     }
     RootedObject obj(aCx, holder->GetJSObject());
     NS_ENSURE_TRUE(obj, nullptr);
     JSAutoCompartment ac(aCx, obj);
     if (aReuseLoaderGlobal) {
         // If we're reusing the loader global, we don't actually use the
         // global, but rather we use a different object as the 'this' object.
         obj = JS_NewObject(aCx, &kFakeBackstagePassJSClass, NullPtr(), NullPtr());
         NS_ENSURE_TRUE(obj, nullptr);
     }
     *aRealFile = false;
     // need to be extra careful checking for URIs pointing to files
     // EnsureFile may not always get called, especially on resource URIs
     // so we need to call GetFile to make sure this is a valid file
     nsCOMPtr<nsIFileURL> fileURL = do_QueryInterface(aURI, &rv);
     nsCOMPtr<nsIFile> testFile;
     if (NS_SUCCEEDED(rv)) {
         fileURL->GetFile(getter_AddRefs(testFile));
     }
     if (testFile) {
         *aRealFile = true;
         nsCOMPtr<nsIXPConnectJSObjectHolder> locationHolder;
         rv = xpc->WrapNative(aCx, obj, aComponentFile,
                              NS_GET_IID(nsIFile),
                              getter_AddRefs(locationHolder));
         NS_ENSURE_SUCCESS(rv, nullptr);
         RootedObject locationObj(aCx, locationHolder->GetJSObject());
         NS_ENSURE_TRUE(locationObj, nullptr);
         if (!JS_DefineProperty(aCx, obj, "__LOCATION__", locationObj, 0))
             return nullptr;
     }
     nsAutoCString nativePath;
     rv = aURI->GetSpec(nativePath);
     NS_ENSURE_SUCCESS(rv, nullptr);
     // Expose the URI from which the script was imported through a special
     // variable that we insert into the JSM.
     RootedString exposedUri(aCx, JS_NewStringCopyN(aCx, nativePath.get(), nativePath.Length()));
     NS_ENSURE_TRUE(exposedUri, nullptr);
     if (!JS_DefineProperty(aCx, obj, "__URI__", exposedUri, 0))
         return nullptr;
     if (createdNewGlobal) {
         RootedObject global(aCx, holder->GetJSObject());
         JS_FireOnNewGlobalObject(aCx, global);
     }
     return obj;
 }
 nsresult
 mozJSComponentLoader::ObjectForLocation(nsIFile *aComponentFile,
                                         nsIURI *aURI,
                                         MutableHandleObject aObject,
                                         MutableHandleScript aTableScript,
                                         char **aLocation,
                                         bool aPropagateExceptions,
                                         MutableHandleValue aException)
 {
     JSCLContextHelper cx(mContext);
     JS_AbortIfWrongThread(JS_GetRuntime(cx));
     JSCLAutoErrorReporterSetter aers(cx, xpc::SystemErrorReporter);
     bool realFile = false;
     RootedObject obj(cx, PrepareObjectForLocation(cx, aComponentFile, aURI,
                                                   mReuseLoaderGlobal, &realFile));
     NS_ENSURE_TRUE(obj, NS_ERROR_FAILURE);
     JSAutoCompartment ac(cx, obj);
     RootedScript script(cx);
     RootedFunction function(cx);
     nsAutoCString nativePath;
     nsresult rv = aURI->GetSpec(nativePath);
     NS_ENSURE_SUCCESS(rv, rv);
     // Before compiling the script, first check to see if we have it in
     // the startupcache.  Note: as a rule, startupcache errors are not fatal
     // to loading the script, since we can always slow-load.
     bool writeToCache = false;
     StartupCache* cache = StartupCache::GetSingleton();
     nsAutoCString cachePath(kJSCachePrefix);
     rv = PathifyURI(aURI, cachePath);
     NS_ENSURE_SUCCESS(rv, rv);
     if (cache) {
         if (!mReuseLoaderGlobal) {
             rv = ReadCachedScript(cache, cachePath, cx, mSystemPrincipal, &script);
         } else {
             rv = ReadCachedFunction(cache, cachePath, cx, mSystemPrincipal,
                                     function.address());
         }
         if (NS_SUCCEEDED(rv)) {
             LOG(("Successfully loaded %s from startupcache\n", nativePath.get()));
         } else {
             // This is ok, it just means the script is not yet in the
             // cache. Could mean that the cache was corrupted and got removed,
             // but either way we're going to write this out.
             writeToCache = true;
         }
     }
     if (!script && !function) {
         // The script wasn't in the cache , so compile it now.
         LOG(("Slow loading %s\n", nativePath.get()));
         // If aPropagateExceptions is true, then our caller wants us to propagate
         // any exceptions out to our caller. Ensure that the engine doesn't
         // eagerly report the exception.
         AutoSaveContextOptions asco(cx);
         if (aPropagateExceptions)
             ContextOptionsRef(cx).setDontReportUncaught(true);
         // Note - if mReuseLoaderGlobal is true, then we can't do lazy source,
         // because we compile things as functions (rather than script), and lazy
         // source isn't supported in that configuration. That's ok though,
         // because we only do mReuseLoaderGlobal on b2g, where we invoke
         // setDiscardSource(true) on the entire global.
         CompileOptions options(cx);
         options.setNoScriptRval(mReuseLoaderGlobal ? false : true)
                .setVersion(JSVERSION_LATEST)
                .setFileAndLine(nativePath.get(), 1)
                .setSourceIsLazy(!mReuseLoaderGlobal);
         if (realFile) {
 #ifdef HAVE_PR_MEMMAP
             int64_t fileSize;
             rv = aComponentFile->GetFileSize(&fileSize);
             if (NS_FAILED(rv)) {
                 return rv;
             }
             int64_t maxSize = UINT32_MAX;
             if (fileSize > maxSize) {
                 NS_ERROR("file too large");
                 return NS_ERROR_FAILURE;
             }
             PRFileDesc *fileHandle;
             rv = aComponentFile->OpenNSPRFileDesc(PR_RDONLY, 0, &fileHandle);
             if (NS_FAILED(rv)) {
                 return NS_ERROR_FILE_NOT_FOUND;
             }
             // Make sure the file is closed, no matter how we return.
             FileAutoCloser fileCloser(fileHandle);
             // We don't provide the file size here.  If we did, PR_CreateFileMap
             // would simply stat() the file to verify that the size we provided
             // didn't require extending the file.  We know that the file doesn't
             // need to be extended, so skip the extra work by not providing the
             // size.
             PRFileMap *map = PR_CreateFileMap(fileHandle, 0, PR_PROT_READONLY);
             if (!map) {
                 NS_ERROR("Failed to create file map");
                 return NS_ERROR_FAILURE;
             }
             // Make sure the file map is closed, no matter how we return.
             FileMapAutoCloser mapCloser(map);
             uint32_t fileSize32 = fileSize;
             char *buf = static_cast<char*>(PR_MemMap(map, 0, fileSize32));
             if (!buf) {
                 NS_WARNING("Failed to map file");
                 return NS_ERROR_FAILURE;
             }
             if (!mReuseLoaderGlobal) {
                 script = Compile(cx, obj, options, buf,
                                      fileSize32);
             } else {
                 function = CompileFunction(cx, obj, options,
                                                nullptr, 0, nullptr,
                                                buf, fileSize32);
             }
             PR_MemUnmap(buf, fileSize32);
 #else  /* HAVE_PR_MEMMAP */
             /**
              * No memmap implementation, so fall back to
              * reading in the file
              */
             FILE *fileHandle;
             rv = aComponentFile->OpenANSIFileDesc("r", &fileHandle);
             if (NS_FAILED(rv)) {
                 return NS_ERROR_FILE_NOT_FOUND;
             }
             // Ensure file fclose
             ANSIFileAutoCloser fileCloser(fileHandle);
             int64_t len;
             rv = aComponentFile->GetFileSize(&len);
             if (NS_FAILED(rv) || len < 0) {
                 NS_WARNING("Failed to get file size");
                 return NS_ERROR_FAILURE;
             }
             char *buf = (char *) malloc(len * sizeof(char));
             if (!buf) {
                 return NS_ERROR_FAILURE;
             }
             size_t rlen = fread(buf, 1, len, fileHandle);
             if (rlen != (uint64_t)len) {
                 free(buf);
                 NS_WARNING("Failed to read file");
                 return NS_ERROR_FAILURE;
             }
             if (!mReuseLoaderGlobal) {
                 script = Compile(cx, obj, options, buf,
                                      fileSize32);
             } else {
                 function = CompileFunction(cx, obj, options,
                                            nullptr, 0, nullptr,
                                            buf, fileSize32);
             }
             free(buf);
 #endif /* HAVE_PR_MEMMAP */
         } else {
             nsCOMPtr<nsIIOService> ioService = do_GetIOService(&rv);
             NS_ENSURE_SUCCESS(rv, rv);
             nsCOMPtr<nsIChannel> scriptChannel;
             rv = ioService->NewChannelFromURI(aURI, getter_AddRefs(scriptChannel));
             NS_ENSURE_SUCCESS(rv, rv);
             nsCOMPtr<nsIInputStream> scriptStream;
             rv = scriptChannel->Open(getter_AddRefs(scriptStream));
             NS_ENSURE_SUCCESS(rv, rv);
             uint64_t len64;
             uint32_t bytesRead;
             rv = scriptStream->Available(&len64);
             NS_ENSURE_SUCCESS(rv, rv);
             NS_ENSURE_TRUE(len64 < UINT32_MAX, NS_ERROR_FILE_TOO_BIG);
             if (!len64)
                 return NS_ERROR_FAILURE;
             uint32_t len = (uint32_t)len64;
             /* malloc an internal buf the size of the file */
             nsAutoArrayPtr<char> buf(new char[len + 1]);
             if (!buf)
                 return NS_ERROR_OUT_OF_MEMORY;
             /* read the file in one swoop */
             rv = scriptStream->Read(buf, len, &bytesRead);
             if (bytesRead != len)
                 return NS_BASE_STREAM_OSERROR;
             buf[len] = '\0';
             if (!mReuseLoaderGlobal) {
                 script = Compile(cx, obj, options, buf, bytesRead);
             } else {
                 function = CompileFunction(cx, obj, options,
                                                nullptr, 0, nullptr,
                                                buf, bytesRead);
             }
         }
         // Propagate the exception, if one exists. Also, don't leave the stale
         // exception on this context.
         if (!script && !function && aPropagateExceptions) {
             JS_GetPendingException(cx, aException);
             JS_ClearPendingException(cx);
         }
     }
     if (!script && !function) {
         return NS_ERROR_FAILURE;
     }
     if (writeToCache) {
         // We successfully compiled the script, so cache it.
         if (script) {
             rv = WriteCachedScript(cache, cachePath, cx, mSystemPrincipal,
                                    script);
         } else {
             rv = WriteCachedFunction(cache, cachePath, cx, mSystemPrincipal,
                                      function);
         }
         // Don't treat failure to write as fatal, since we might be working
         // with a read-only cache.
         if (NS_SUCCEEDED(rv)) {
             LOG(("Successfully wrote to cache\n"));
         } else {
             LOG(("Failed to write to cache\n"));
         }
     }
     // Assign aObject here so that it's available to recursive imports.
     // See bug 384168.
     aObject.set(obj);
     RootedScript tableScript(cx, script);
     if (!tableScript) {
         tableScript = JS_GetFunctionScript(cx, function);
         MOZ_ASSERT(tableScript);
     }
     aTableScript.set(tableScript);
     if (js::GetObjectJSClass(obj) == &kFakeBackstagePassJSClass) {
         MOZ_ASSERT(mReuseLoaderGlobal);
         // tableScript stays in the table until shutdown.  It is rooted by
         // virtue of the fact that aTableScript is a handle to
         // ModuleEntry::thisObjectKey, which is a PersistentRootedScript.  Since
         // ModuleEntries are never dynamically unloaded when mReuseLoaderGlobal
         // is true, this prevents it from being collected and another script
         // getting the same address.
         mThisObjects.Put(tableScript, obj);
     }
     bool ok = false;
     {
         AutoSaveContextOptions asco(cx);
         if (aPropagateExceptions)
             ContextOptionsRef(cx).setDontReportUncaught(true);
         if (script) {
             ok = JS_ExecuteScriptVersion(cx, obj, script, JSVERSION_LATEST);
         } else {
             RootedValue rval(cx);
             ok = JS_CallFunction(cx, obj, function, JS::HandleValueArray::empty(), &rval);
         }
      }
     if (!ok) {
         if (aPropagateExceptions) {
             JS_GetPendingException(cx, aException);
             JS_ClearPendingException(cx);
         }
         aObject.set(nullptr);
         aTableScript.set(nullptr);
         mThisObjects.Remove(tableScript);
         return NS_ERROR_FAILURE;
     }
     /* Freed when we remove from the table. */
     *aLocation = ToNewCString(nativePath);
     if (!*aLocation) {
         aObject.set(nullptr);
         aTableScript.set(nullptr);
         mThisObjects.Remove(tableScript);
         return NS_ERROR_OUT_OF_MEMORY;
     }
     return NS_OK;
 }
 /* static */ PLDHashOperator
 mozJSComponentLoader::ClearModules(const nsACString& key, ModuleEntry*& entry, void* cx)
 {
     entry->Clear();
     return PL_DHASH_REMOVE;
 }
 void
 mozJSComponentLoader::UnloadModules()
 {
     mInitialized = false;
     if (mLoaderGlobal) {
         MOZ_ASSERT(mReuseLoaderGlobal, "How did this happen?");
         JSAutoRequest ar(mContext);
         RootedObject global(mContext, mLoaderGlobal->GetJSObject());
         if (global) {
             JSAutoCompartment ac(mContext, global);
             JS_SetAllNonReservedSlotsToUndefined(mContext, global);
         } else {
             NS_WARNING("Going to leak!");
         }
         mLoaderGlobal = nullptr;
     }
     mInProgressImports.Clear();
     mImports.Clear();
     mThisObjects.Clear();
     mModules.Enumerate(ClearModules, nullptr);
     JS_DestroyContextNoGC(mContext);
     mContext = nullptr;
     mRuntimeService = nullptr;
 }
 NS_IMETHODIMP
 mozJSComponentLoader::Import(const nsACString& registryLocation,
                              HandleValue targetValArg,
                              JSContext *cx,
                              uint8_t optionalArgc,
                              MutableHandleValue retval)
 {
     MOZ_ASSERT(nsContentUtils::IsCallerChrome());
     RootedValue targetVal(cx, targetValArg);
     RootedObject targetObject(cx, nullptr);
     if (optionalArgc) {
         // The caller passed in the optional second argument. Get it.
         if (targetVal.isObject()) {
             // If we're passing in something like a content DOM window, chances
             // are the caller expects the properties to end up on the object
             // proper and not on the Xray holder. This is dubious, but can be used
             // during testing. Given that dumb callers can already leak JSMs into
             // content by passing a raw content JS object (where Xrays aren't
             // possible), we aim for consistency here. Waive xray.
             if (WrapperFactory::IsXrayWrapper(&targetVal.toObject()) &&
                 !WrapperFactory::WaiveXrayAndWrap(cx, &targetVal))
             {
                 return NS_ERROR_FAILURE;
             }
             targetObject = &targetVal.toObject();
         } else if (!targetVal.isNull()) {
             // If targetVal isNull(), we actually want to leave targetObject null.
             // Not doing so breaks |make package|.
             return ReportOnCaller(cx, ERROR_SCOPE_OBJ,
                                   PromiseFlatCString(registryLocation).get());
         }
     } else {
         nsresult rv = FindTargetObject(cx, &targetObject);
         NS_ENSURE_SUCCESS(rv, rv);
     }
     Maybe<JSAutoCompartment> ac;
     if (targetObject) {
         ac.construct(cx, targetObject);
     }
     RootedObject global(cx);
     nsresult rv = ImportInto(registryLocation, targetObject, cx, &global);
     if (global) {
         if (!JS_WrapObject(cx, &global)) {
             NS_ERROR("can't wrap return value");
             return NS_ERROR_FAILURE;
         }
         retval.setObject(*global);
     }
     return rv;
 }
 /* [noscript] JSObjectPtr importInto(in AUTF8String registryLocation,
                                      in JSObjectPtr targetObj); */
 NS_IMETHODIMP
 mozJSComponentLoader::ImportInto(const nsACString &aLocation,
                                  JSObject *aTargetObj,
                                  nsAXPCNativeCallContext *cc,
                                  JSObject **_retval)
 {
     JSContext *callercx;
     nsresult rv = cc->GetJSContext(&callercx);
     NS_ENSURE_SUCCESS(rv, rv);
     RootedObject targetObject(callercx, aTargetObj);
     RootedObject global(callercx);
     rv = ImportInto(aLocation, targetObject, callercx, &global);
     NS_ENSURE_SUCCESS(rv, rv);
     *_retval = global;
     return NS_OK;
 }
 nsresult
 mozJSComponentLoader::ImportInto(const nsACString &aLocation,
                                  HandleObject targetObj,
                                  JSContext *callercx,
                                  MutableHandleObject vp)
 {
     vp.set(nullptr);
     nsresult rv;
     if (!mInitialized) {
         rv = ReallyInit();
         NS_ENSURE_SUCCESS(rv, rv);
     }
     nsCOMPtr<nsIIOService> ioService = do_GetIOService(&rv);
     NS_ENSURE_SUCCESS(rv, rv);
     // Get the URI.
     nsCOMPtr<nsIURI> resURI;
     rv = ioService->NewURI(aLocation, nullptr, nullptr, getter_AddRefs(resURI));
     NS_ENSURE_SUCCESS(rv, rv);
     // figure out the resolved URI
     nsCOMPtr<nsIChannel> scriptChannel;
     rv = ioService->NewChannelFromURI(resURI, getter_AddRefs(scriptChannel));
     NS_ENSURE_SUCCESS(rv, NS_ERROR_INVALID_ARG);
     nsCOMPtr<nsIURI> resolvedURI;
     rv = scriptChannel->GetURI(getter_AddRefs(resolvedURI));
     NS_ENSURE_SUCCESS(rv, rv);
     // get the JAR if there is one
     nsCOMPtr<nsIJARURI> jarURI;
     jarURI = do_QueryInterface(resolvedURI, &rv);
     nsCOMPtr<nsIFileURL> baseFileURL;
     if (NS_SUCCEEDED(rv)) {
         nsCOMPtr<nsIURI> baseURI;
         while (jarURI) {
             jarURI->GetJARFile(getter_AddRefs(baseURI));
             jarURI = do_QueryInterface(baseURI, &rv);
         }
         baseFileURL = do_QueryInterface(baseURI, &rv);
         NS_ENSURE_SUCCESS(rv, rv);
     } else {
         baseFileURL = do_QueryInterface(resolvedURI, &rv);
         NS_ENSURE_SUCCESS(rv, rv);
     }
     nsCOMPtr<nsIFile> sourceFile;
     rv = baseFileURL->GetFile(getter_AddRefs(sourceFile));
     NS_ENSURE_SUCCESS(rv, rv);
     nsCOMPtr<nsIFile> sourceLocalFile;
     sourceLocalFile = do_QueryInterface(sourceFile, &rv);
     NS_ENSURE_SUCCESS(rv, rv);
     nsAutoCString key;
     rv = resolvedURI->GetSpec(key);
     NS_ENSURE_SUCCESS(rv, rv);
     ModuleEntry* mod;
     nsAutoPtr<ModuleEntry> newEntry;
     if (!mImports.Get(key, &mod) && !mInProgressImports.Get(key, &mod)) {
         newEntry = new ModuleEntry(callercx);
         if (!newEntry)
             return NS_ERROR_OUT_OF_MEMORY;
         mInProgressImports.Put(key, newEntry);
         RootedValue exception(callercx);
         rv = ObjectForLocation(sourceLocalFile, resURI, &newEntry->obj,
                                &newEntry->thisObjectKey,
                                &newEntry->location, true, &exception);
         mInProgressImports.Remove(key);
         if (NS_FAILED(rv)) {
             if (!exception.isUndefined()) {
                 // An exception was thrown during compilation. Propagate it
                 // out to our caller so they can report it.
                 if (!JS_WrapValue(callercx, &exception))
                     return NS_ERROR_OUT_OF_MEMORY;
                 JS_SetPendingException(callercx, exception);
                 return NS_OK;
             }
             // Something failed, but we don't know what it is, guess.
             return NS_ERROR_FILE_NOT_FOUND;
         }
         // Set the location information for the new global, so that tools like
         // about:memory may use that information
         if (!mReuseLoaderGlobal) {
             xpc::SetLocationForGlobal(newEntry->obj, aLocation);
         }
         mod = newEntry;
     }
     MOZ_ASSERT(mod->obj, "Import table contains entry with no object");
     vp.set(mod->obj);
     if (targetObj) {
         JSCLContextHelper cxhelper(mContext);
         JSAutoCompartment ac(mContext, mod->obj);
         RootedValue symbols(mContext);
         RootedObject modObj(mContext, mod->obj);
         if (!JS_GetProperty(mContext, modObj,
                             "EXPORTED_SYMBOLS", &symbols)) {
             return ReportOnCaller(cxhelper, ERROR_NOT_PRESENT,
                                   PromiseFlatCString(aLocation).get());
         }
         if (!JS_IsArrayObject(mContext, symbols)) {
             return ReportOnCaller(cxhelper, ERROR_NOT_AN_ARRAY,
                                   PromiseFlatCString(aLocation).get());
         }
         RootedObject symbolsObj(mContext, &symbols.toObject());
         // Iterate over symbols array, installing symbols on targetObj:
         uint32_t symbolCount = 0;
         if (!JS_GetArrayLength(mContext, symbolsObj, &symbolCount)) {
             return ReportOnCaller(cxhelper, ERROR_GETTING_ARRAY_LENGTH,
                                   PromiseFlatCString(aLocation).get());
         }
 #ifdef DEBUG
         nsAutoCString logBuffer;
 #endif
         RootedValue value(mContext);
         RootedId symbolId(mContext);
         for (uint32_t i = 0; i < symbolCount; ++i) {
             if (!JS_GetElement(mContext, symbolsObj, i, &value) ||
                 !value.isString() ||
                 !JS_ValueToId(mContext, value, &symbolId)) {
                 return ReportOnCaller(cxhelper, ERROR_ARRAY_ELEMENT,
                                       PromiseFlatCString(aLocation).get(), i);
             }
             RootedObject modObj(mContext, mod->obj);
             if (!JS_GetPropertyById(mContext, modObj, symbolId, &value)) {
                 JSAutoByteString bytes(mContext, JSID_TO_STRING(symbolId));
                 if (!bytes)
                     return NS_ERROR_FAILURE;
                 return ReportOnCaller(cxhelper, ERROR_GETTING_SYMBOL,
                                       PromiseFlatCString(aLocation).get(),
                                       bytes.ptr());
             }
             JSAutoCompartment target_ac(mContext, targetObj);
             if (!JS_WrapValue(mContext, &value) ||
                 !JS_SetPropertyById(mContext, targetObj, symbolId, value)) {
                 JSAutoByteString bytes(mContext, JSID_TO_STRING(symbolId));
                 if (!bytes)
                     return NS_ERROR_FAILURE;
                 return ReportOnCaller(cxhelper, ERROR_SETTING_SYMBOL,
                                       PromiseFlatCString(aLocation).get(),
                                       bytes.ptr());
             }
 #ifdef DEBUG
             if (i == 0) {
                 logBuffer.AssignLiteral("Installing symbols [ ");
             }
             JSAutoByteString bytes(mContext, JSID_TO_STRING(symbolId));
             if (!!bytes)
                 logBuffer.Append(bytes.ptr());
             logBuffer.AppendLiteral(" ");
             if (i == symbolCount - 1) {
                 LOG(("%s] from %s\n", logBuffer.get(),
                      PromiseFlatCString(aLocation).get()));
             }
 #endif
         }
     }
     // Cache this module for later
     if (newEntry) {
         mImports.Put(key, newEntry);
         newEntry.forget();
     }
     return NS_OK;
 }
 NS_IMETHODIMP
 mozJSComponentLoader::Unload(const nsACString & aLocation)
 {
     nsresult rv;
     if (!mInitialized) {
         return NS_OK;
     }
     nsCOMPtr<nsIIOService> ioService = do_GetIOService(&rv);
     NS_ENSURE_SUCCESS(rv, rv);
     // Get the URI.
     nsCOMPtr<nsIURI> resURI;
     rv = ioService->NewURI(aLocation, nullptr, nullptr, getter_AddRefs(resURI));
     NS_ENSURE_SUCCESS(rv, rv);
     // figure out the resolved URI
     nsCOMPtr<nsIChannel> scriptChannel;
     rv = ioService->NewChannelFromURI(resURI, getter_AddRefs(scriptChannel));
     NS_ENSURE_SUCCESS(rv, NS_ERROR_INVALID_ARG);
     nsCOMPtr<nsIURI> resolvedURI;
     rv = scriptChannel->GetURI(getter_AddRefs(resolvedURI));
     NS_ENSURE_SUCCESS(rv, rv);
     nsAutoCString key;
     rv = resolvedURI->GetSpec(key);
     NS_ENSURE_SUCCESS(rv, rv);
     ModuleEntry* mod;
     if (mImports.Get(key, &mod)) {
         mImports.Remove(key);
     }
     return NS_OK;
 }
 NS_IMETHODIMP
 mozJSComponentLoader::Observe(nsISupports *subject, const char *topic,
                               const char16_t *data)
 {
     if (!strcmp(topic, "xpcom-shutdown-loaders")) {
         UnloadModules();
     } else {
         NS_ERROR("Unexpected observer topic.");
     }
     return NS_OK;
 }
 size_t
 mozJSComponentLoader::ModuleEntry::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
 {
     size_t n = aMallocSizeOf(this);
     n += aMallocSizeOf(location);
     return n;
 }
 /* static */ already_AddRefed<nsIFactory>
 mozJSComponentLoader::ModuleEntry::GetFactory(const mozilla::Module& module,
                                               const mozilla::Module::CIDEntry& entry)
 {
     const ModuleEntry& self = static_cast<const ModuleEntry&>(module);
     MOZ_ASSERT(self.getfactoryobj, "Handing out an uninitialized module?");
     nsCOMPtr<nsIFactory> f;
     nsresult rv = self.getfactoryobj->Get(*entry.cid, getter_AddRefs(f));
     if (NS_FAILED(rv))
         return nullptr;
     return f.forget();
 }
 //----------------------------------------------------------------------
 JSCLContextHelper::JSCLContextHelper(JSContext* aCx)
     : mContext(aCx)
     , mBuf(nullptr)
 {
     mPusher.Push(mContext);
     JS_BeginRequest(mContext);
 }
 JSCLContextHelper::~JSCLContextHelper()
 {
     JS_EndRequest(mContext);
     mPusher.Pop();
     JSContext *restoredCx = nsContentUtils::GetCurrentJSContext();
     if (restoredCx && mBuf) {
         JS_ReportError(restoredCx, mBuf);
     }
     if (mBuf) {
         JS_smprintf_free(mBuf);
     }
 }
 void
 JSCLContextHelper::reportErrorAfterPop(char *buf)
 {
     MOZ_ASSERT(!mBuf, "Already called reportErrorAfterPop");
     mBuf = buf;
 }

The Tor Browser / annotate

js/xpconnect/loader/mozJSComponentLoader.cpp@a63d609f5ebe (annotated)

js/xpconnect/loader/mozJSComponentLoader.cpp