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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/. */
#ifndef mozJSComponentLoader_h
#define mozJSComponentLoader_h
#include "mozilla/dom/ScriptSettings.h"
#include "mozilla/FileLocation.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/Module.h"
#include "mozilla/StaticPtr.h"
#include "mozilla/UniquePtr.h"
#include "nsISupports.h"
#include "nsIURI.h"
#include "nsClassHashtable.h"
#include "nsDataHashtable.h"
#include "jsapi.h"
#include "xpcIJSGetFactory.h"
#include "xpcpublic.h"
class nsIFile;
class ComponentLoaderInfo;
namespace mozilla {
class ScriptPreloader;
} // namespace mozilla
#if defined(NIGHTLY_BUILD) || defined(MOZ_DEV_EDITION) || defined(DEBUG)
# define STARTUP_RECORDER_ENABLED
#endif
class mozJSComponentLoader final {
public:
NS_INLINE_DECL_REFCOUNTING(mozJSComponentLoader);
void GetLoadedModules(nsTArray<nsCString>& aLoadedModules);
void GetLoadedComponents(nsTArray<nsCString>& aLoadedComponents);
nsresult GetModuleImportStack(const nsACString& aLocation,
nsACString& aRetval);
nsresult GetComponentLoadStack(const nsACString& aLocation,
nsACString& aRetval);
const mozilla::Module* LoadModule(mozilla::FileLocation& aFile);
void FindTargetObject(JSContext* aCx, JS::MutableHandleObject aTargetObject);
static void InitStatics();
static void Unload();
static void Shutdown();
static mozJSComponentLoader* Get() {
MOZ_ASSERT(sSelf, "Should have already created the component loader");
return sSelf;
}
nsresult ImportInto(const nsACString& aResourceURI,
JS::HandleValue aTargetObj, JSContext* aCx, uint8_t aArgc,
JS::MutableHandleValue aRetval);
nsresult Import(JSContext* aCx, const nsACString& aResourceURI,
JS::MutableHandleObject aModuleGlobal,
JS::MutableHandleObject aModuleExports,
bool aIgnoreExports = false);
nsresult Unload(const nsACString& aResourceURI);
nsresult IsModuleLoaded(const nsACString& aResourceURI, bool* aRetval);
bool IsLoaderGlobal(JSObject* aObj) { return mLoaderGlobal == aObj; }
size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf);
/**
* Temporary diagnostic function for startup crashes in bug 1403348:
*
* Annotate the crash report with the contents of the async shutdown
* module/component scripts.
*/
nsresult AnnotateCrashReport();
protected:
mozJSComponentLoader();
~mozJSComponentLoader();
friend class XPCJSRuntime;
private:
static mozilla::StaticRefPtr<mozJSComponentLoader> sSelf;
void UnloadModules();
void CreateLoaderGlobal(JSContext* aCx, const nsACString& aLocation,
JS::MutableHandleObject aGlobal);
JSObject* GetSharedGlobal(JSContext* aCx);
JSObject* PrepareObjectForLocation(JSContext* aCx, nsIFile* aComponentFile,
nsIURI* aComponent, bool* aRealFile);
nsresult ObjectForLocation(ComponentLoaderInfo& aInfo,
nsIFile* aComponentFile,
JS::MutableHandleObject aObject,
JS::MutableHandleScript aTableScript,
char** location, bool aCatchException,
JS::MutableHandleValue aException);
nsresult ImportInto(const nsACString& aLocation, JS::HandleObject targetObj,
JSContext* callercx, JS::MutableHandleObject vp);
nsCOMPtr<nsIComponentManager> mCompMgr;
class ModuleEntry : public mozilla::Module {
public:
explicit ModuleEntry(JS::RootingContext* aRootingCx)
: mozilla::Module(),
obj(aRootingCx),
exports(aRootingCx),
thisObjectKey(aRootingCx) {
mVersion = mozilla::Module::kVersion;
mCIDs = nullptr;
mContractIDs = nullptr;
mCategoryEntries = nullptr;
getFactoryProc = GetFactory;
loadProc = nullptr;
unloadProc = nullptr;
location = nullptr;
}
~ModuleEntry() { Clear(); }
void Clear() {
getfactoryobj = nullptr;
if (obj) {
if (JS_HasExtensibleLexicalEnvironment(obj)) {
JS::RootedObject lexicalEnv(mozilla::dom::RootingCx(),
JS_ExtensibleLexicalEnvironment(obj));
JS_SetAllNonReservedSlotsToUndefined(lexicalEnv);
}
JS_SetAllNonReservedSlotsToUndefined(obj);
obj = nullptr;
thisObjectKey = nullptr;
}
if (location) {
free(location);
}
obj = nullptr;
thisObjectKey = nullptr;
location = nullptr;
#ifdef STARTUP_RECORDER_ENABLED
importStack.Truncate();
#endif
}
size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
static already_AddRefed<nsIFactory> GetFactory(
const mozilla::Module& module, const mozilla::Module::CIDEntry& entry);
nsCOMPtr<xpcIJSGetFactory> getfactoryobj;
JS::PersistentRootedObject obj;
JS::PersistentRootedObject exports;
JS::PersistentRootedScript thisObjectKey;
char* location;
nsCString resolvedURL;
#ifdef STARTUP_RECORDER_ENABLED
nsCString importStack;
#endif
};
nsresult ExtractExports(JSContext* aCx, ComponentLoaderInfo& aInfo,
ModuleEntry* aMod, JS::MutableHandleObject aExports);
// Modules are intentionally leaked, but still cleared.
nsDataHashtable<nsCStringHashKey, ModuleEntry*> mModules;
nsClassHashtable<nsCStringHashKey, ModuleEntry> mImports;
nsDataHashtable<nsCStringHashKey, ModuleEntry*> mInProgressImports;
// A map of on-disk file locations which are loaded as modules to the
// pre-resolved URIs they were loaded from. Used to prevent the same file
// from being loaded separately, from multiple URLs.
nsClassHashtable<nsCStringHashKey, nsCString> mLocations;
bool mInitialized;
JS::PersistentRooted<JSObject*> mLoaderGlobal;
};
#endif
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