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gecko-dev/js/xpconnect/loader/mozJSComponentLoader.cpp

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/* -*- 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"
#include <cstdarg>
#include "mozilla/Logging.h"
#ifdef ANDROID
#include <android/log.h>
#endif
#ifdef XP_WIN
#include <windows.h>
#endif
#include "jsapi.h"
#include "js/Printf.h"
#include "nsCOMPtr.h"
#include "nsAutoPtr.h"
#include "nsIComponentManager.h"
#include "mozilla/Module.h"
#include "nsIFile.h"
#include "mozJSComponentLoader.h"
#include "mozJSLoaderUtils.h"
#include "nsIXPConnect.h"
#include "nsIObserverService.h"
#include "nsIScriptSecurityManager.h"
#include "nsIFileURL.h"
#include "nsIJARURI.h"
#include "nsNetUtil.h"
#include "nsJSPrincipals.h"
#include "nsJSUtils.h"
#include "xpcprivate.h"
#include "xpcpublic.h"
#include "nsContentUtils.h"
#include "nsReadableUtils.h"
#include "nsXULAppAPI.h"
#include "GeckoProfiler.h"
#include "WrapperFactory.h"
#include "AutoMemMap.h"
#include "ScriptPreloader-inl.h"
#include "mozilla/AddonPathService.h"
#include "mozilla/scache/StartupCache.h"
#include "mozilla/scache/StartupCacheUtils.h"
#include "mozilla/MacroForEach.h"
#include "mozilla/Preferences.h"
#include "mozilla/ScriptPreloader.h"
#include "mozilla/dom/DOMPrefs.h"
#include "mozilla/dom/ScriptSettings.h"
#include "mozilla/ResultExtensions.h"
#include "mozilla/UniquePtrExtensions.h"
#include "mozilla/Unused.h"
using namespace mozilla;
using namespace mozilla::scache;
using namespace mozilla::loader;
using namespace xpc;
using namespace JS;
static const char kObserverServiceContractID[] = "@mozilla.org/observer-service;1";
#define JS_CACHE_PREFIX(aType) "jsloader/" aType
/**
* 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)
// MOZ_LOG=JSComponentLoader:5
static LazyLogModule gJSCLLog("JSComponentLoader");
#define LOG(args) MOZ_LOG(gJSCLLog, mozilla::LogLevel::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)
{
if (!mozilla::dom::DOMPrefs::DumpEnabled()) {
return true;
}
CallArgs args = CallArgsFromVp(argc, vp);
if (args.length() == 0)
return true;
RootedString str(cx, JS::ToString(cx, args[0]));
if (!str)
return false;
JSAutoByteString utf8str;
if (!utf8str.encodeUtf8(cx, str))
return false;
#ifdef ANDROID
__android_log_print(ANDROID_LOG_INFO, "Gecko", "%s", utf8str.ptr());
#endif
#ifdef XP_WIN
if (IsDebuggerPresent()) {
nsAutoJSString wstr;
if (!wstr.init(cx, str))
return false;
OutputDebugStringW(wstr.get());
}
#endif
fputs(utf8str.ptr(), stdout);
fflush(stdout);
return true;
}
static bool
Debug(JSContext* cx, unsigned argc, Value* vp)
{
#ifdef DEBUG
return Dump(cx, argc, vp);
#else
return true;
#endif
}
static const JSFunctionSpec gGlobalFun[] = {
JS_FN("dump", Dump, 1,0),
JS_FN("debug", Debug, 1,0),
JS_FN("atob", Atob, 1,0),
JS_FN("btoa", Btoa, 1,0),
JS_FS_END
};
class MOZ_STACK_CLASS JSCLContextHelper
{
public:
explicit JSCLContextHelper(JSContext* aCx);
~JSCLContextHelper();
void reportErrorAfterPop(UniqueChars&& buf);
private:
JSContext* mContext;
UniqueChars mBuf;
// prevent copying and assignment
JSCLContextHelper(const JSCLContextHelper&) = delete;
const JSCLContextHelper& operator=(const JSCLContextHelper&) = delete;
};
static nsresult
MOZ_FORMAT_PRINTF(2, 3)
ReportOnCallerUTF8(JSContext* callerContext,
const char* format, ...) {
if (!callerContext) {
return NS_ERROR_FAILURE;
}
va_list ap;
va_start(ap, format);
UniqueChars buf = JS_vsmprintf(format, ap);
if (!buf) {
va_end(ap);
return NS_ERROR_OUT_OF_MEMORY;
}
JS_ReportErrorUTF8(callerContext, "%s", buf.get());
va_end(ap);
return NS_OK;
}
mozJSComponentLoader::mozJSComponentLoader()
: mModules(16),
mImports(16),
mInProgressImports(16),
mLocations(16),
mInitialized(false),
mShareLoaderGlobal(false),
mLoaderGlobal(dom::RootingCx())
{
MOZ_ASSERT(!sSelf, "mozJSComponentLoader should be a singleton");
}
// static
already_AddRefed<mozJSComponentLoader>
mozJSComponentLoader::GetOrCreate()
{
if (!sSelf) {
sSelf = new mozJSComponentLoader();
}
return do_AddRef(sSelf);
}
#define ENSURE_DEP(name) { nsresult rv = Ensure##name(); NS_ENSURE_SUCCESS(rv, rv); }
#define ENSURE_DEPS(...) MOZ_FOR_EACH(ENSURE_DEP, (), (__VA_ARGS__));
#define BEGIN_ENSURE(self, ...) { \
if (m##self) \
return NS_OK; \
ENSURE_DEPS(__VA_ARGS__); \
}
class MOZ_STACK_CLASS ComponentLoaderInfo {
public:
explicit ComponentLoaderInfo(const nsACString& aLocation) : mLocation(aLocation) {}
nsIIOService* IOService() { MOZ_ASSERT(mIOService); return mIOService; }
nsresult EnsureIOService() {
if (mIOService)
return NS_OK;
nsresult rv;
mIOService = do_GetIOService(&rv);
return rv;
}
nsIURI* URI() { MOZ_ASSERT(mURI); return mURI; }
nsresult EnsureURI() {
BEGIN_ENSURE(URI, IOService);
return mIOService->NewURI(mLocation, nullptr, nullptr, getter_AddRefs(mURI));
}
nsIChannel* ScriptChannel() { MOZ_ASSERT(mScriptChannel); return mScriptChannel; }
nsresult EnsureScriptChannel() {
BEGIN_ENSURE(ScriptChannel, IOService, URI);
return NS_NewChannel(getter_AddRefs(mScriptChannel),
mURI,
nsContentUtils::GetSystemPrincipal(),
nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_DATA_IS_NULL,
nsIContentPolicy::TYPE_SCRIPT,
nullptr, // aPerformanceStorage
nullptr, // aLoadGroup
nullptr, // aCallbacks
nsIRequest::LOAD_NORMAL,
mIOService);
}
nsIURI* ResolvedURI() { MOZ_ASSERT(mResolvedURI); return mResolvedURI; }
nsresult EnsureResolvedURI() {
BEGIN_ENSURE(ResolvedURI, URI);
return ResolveURI(mURI, getter_AddRefs(mResolvedURI));
}
const nsACString& Key() { return mLocation; }
nsresult EnsureKey() {
return NS_OK;
}
MOZ_MUST_USE nsresult GetLocation(nsCString& aLocation) {
nsresult rv = EnsureURI();
NS_ENSURE_SUCCESS(rv, rv);
return mURI->GetSpec(aLocation);
}
private:
const nsACString& mLocation;
nsCOMPtr<nsIIOService> mIOService;
nsCOMPtr<nsIURI> mURI;
nsCOMPtr<nsIChannel> mScriptChannel;
nsCOMPtr<nsIURI> mResolvedURI;
};
template <typename ...Args>
static nsresult
ReportOnCallerUTF8(JSCLContextHelper& helper,
const char* format,
ComponentLoaderInfo& info,
Args... args)
{
nsCString location;
MOZ_TRY(info.GetLocation(location));
UniqueChars buf = JS_smprintf(format, location.get(), args...);
if (!buf) {
return NS_ERROR_OUT_OF_MEMORY;
}
helper.reportErrorAfterPop(Move(buf));
return NS_ERROR_FAILURE;
}
#undef BEGIN_ENSURE
#undef ENSURE_DEPS
#undef ENSURE_DEP
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()
{
MOZ_ASSERT(!mInitialized);
const char* shareGlobal = PR_GetEnv("MOZ_LOADER_SHARE_GLOBAL");
if (shareGlobal && *shareGlobal) {
nsDependentCString val(shareGlobal);
mShareLoaderGlobal = !(val.EqualsLiteral("0") ||
val.LowerCaseEqualsLiteral("no") ||
val.LowerCaseEqualsLiteral("false") ||
val.LowerCaseEqualsLiteral("off"));
} else {
mShareLoaderGlobal = Preferences::GetBool("jsloader.shareGlobal");
}
nsresult rv;
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;
}
// For terrible compatibility reasons, we need to consider both the global
// lexical environment and the global of modules when searching for exported
// symbols.
static JSObject*
ResolveModuleObjectProperty(JSContext* aCx, HandleObject aModObj, const char* name)
{
if (JS_HasExtensibleLexicalEnvironment(aModObj)) {
RootedObject lexical(aCx, JS_ExtensibleLexicalEnvironment(aModObj));
bool found;
if (!JS_HasOwnProperty(aCx, lexical, name, &found)) {
return nullptr;
}
if (found) {
return lexical;
}
}
return aModObj;
}
const mozilla::Module*
mozJSComponentLoader::LoadModule(FileLocation& aFile)
{
if (!NS_IsMainThread()) {
MOZ_ASSERT(false, "Don't use JS components off the main thread");
return nullptr;
}
nsCOMPtr<nsIFile> file = aFile.GetBaseFile();
nsCString spec;
aFile.GetURIString(spec);
ComponentLoaderInfo info(spec);
nsresult rv = info.EnsureURI();
NS_ENSURE_SUCCESS(rv, nullptr);
if (!mInitialized) {
rv = ReallyInit();
if (NS_FAILED(rv))
return nullptr;
}
AUTO_PROFILER_LABEL_DYNAMIC_NSCSTRING(
"mozJSComponentLoader::LoadModule", OTHER, spec);
ModuleEntry* mod;
if (mModules.Get(spec, &mod))
return mod;
dom::AutoJSAPI jsapi;
jsapi.Init();
JSContext* cx = jsapi.cx();
bool isCriticalModule = StringEndsWith(spec, NS_LITERAL_CSTRING("/nsAsyncShutdown.js"));
nsAutoPtr<ModuleEntry> entry(new ModuleEntry(RootingContext::get(cx)));
RootedValue exn(cx);
rv = ObjectForLocation(info, file, &entry->obj, &entry->thisObjectKey,
&entry->location, isCriticalModule, &exn);
if (NS_FAILED(rv)) {
// Temporary debugging assertion for bug 1403348:
if (isCriticalModule && !exn.isUndefined()) {
JSAutoCompartment ac(cx, xpc::PrivilegedJunkScope());
JS_WrapValue(cx, &exn);
nsAutoCString file;
uint32_t line;
uint32_t column;
nsAutoString msg;
nsContentUtils::ExtractErrorValues(cx, exn, file, &line, &column, msg);
NS_ConvertUTF16toUTF8 cMsg(msg);
MOZ_CRASH_UNSAFE_PRINTF("Failed to load module \"%s\": "
"[\"%s\" {file: \"%s\", line: %u}]",
spec.get(), cMsg.get(), file.get(), line);
}
return nullptr;
}
nsCOMPtr<nsIComponentManager> cm;
rv = NS_GetComponentManager(getter_AddRefs(cm));
if (NS_FAILED(rv))
return nullptr;
JSAutoCompartment ac(cx, entry->obj);
RootedObject entryObj(cx, entry->obj);
RootedObject NSGetFactoryHolder(cx, ResolveModuleObjectProperty(cx, entryObj, "NSGetFactory"));
RootedValue NSGetFactory_val(cx);
if (!NSGetFactoryHolder ||
!JS_GetProperty(cx, NSGetFactoryHolder, "NSGetFactory", &NSGetFactory_val) ||
NSGetFactory_val.isUndefined())
{
return nullptr;
}
if (JS_TypeOfValue(cx, NSGetFactory_val) != JSTYPE_FUNCTION) {
/*
* spec's encoding is ASCII unless it's zip file, otherwise it's
* random encoding. Latin1 variant is safe for random encoding.
*/
JS_ReportErrorLatin1(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 = nsXPConnect::XPConnect()->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;
}
#if defined(NIGHTLY_BUILD) || defined(DEBUG)
if (Preferences::GetBool("browser.startup.record", false)) {
entry->importStack = xpc_PrintJSStack(cx, false, false, false).get();
}
#endif
// Cache this module for later
mModules.Put(spec, entry);
// The hash owns the ModuleEntry now, forget about it
return entry.forget();
}
void
mozJSComponentLoader::FindTargetObject(JSContext* aCx,
MutableHandleObject aTargetObject)
{
aTargetObject.set(js::GetJSMEnvironmentOfScriptedCaller(aCx));
// The above could fail if the scripted caller is not a component/JSM (it
// could be a DOM scope, for instance).
//
// If the target object was not in the JSM shared global, return the global
// instead. This is needed when calling the subscript loader within a frame
// script, since it the FrameScript NSVO will have been found.
if (!aTargetObject ||
!IsLoaderGlobal(js::GetGlobalForObjectCrossCompartment(aTargetObject))) {
aTargetObject.set(CurrentGlobalOrNull(aCx));
}
}
// This requires that the keys be strings and the values be pointers.
template <class Key, class Data, class UserData>
static size_t
SizeOfTableExcludingThis(const nsBaseHashtable<Key, Data, UserData>& aTable,
MallocSizeOf aMallocSizeOf)
{
size_t n = aTable.ShallowSizeOfExcludingThis(aMallocSizeOf);
for (auto iter = aTable.ConstIter(); !iter.Done(); iter.Next()) {
n += iter.Key().SizeOfExcludingThisIfUnshared(aMallocSizeOf);
n += iter.Data()->SizeOfIncludingThis(aMallocSizeOf);
}
return n;
}
size_t
mozJSComponentLoader::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf)
{
size_t n = aMallocSizeOf(this);
n += SizeOfTableExcludingThis(mModules, aMallocSizeOf);
n += SizeOfTableExcludingThis(mImports, aMallocSizeOf);
n += mLocations.ShallowSizeOfExcludingThis(aMallocSizeOf);
n += SizeOfTableExcludingThis(mInProgressImports, aMallocSizeOf);
return n;
}
void
mozJSComponentLoader::CreateLoaderGlobal(JSContext* aCx,
const nsACString& aLocation,
JSAddonId* aAddonID,
MutableHandleObject aGlobal)
{
RefPtr<BackstagePass> backstagePass;
nsresult rv = NS_NewBackstagePass(getter_AddRefs(backstagePass));
NS_ENSURE_SUCCESS_VOID(rv);
CompartmentOptions options;
options.creationOptions()
.setSystemZone()
.setAddonId(aAddonID);
if (xpc::SharedMemoryEnabled())
options.creationOptions().setSharedMemoryAndAtomicsEnabled(true);
// Defer firing OnNewGlobalObject until after the __URI__ property has
// been defined so the JS debugger can tell what module the global is
// for
RootedObject global(aCx);
rv = xpc::InitClassesWithNewWrappedGlobal(aCx,
static_cast<nsIGlobalObject*>(backstagePass),
nsContentUtils::GetSystemPrincipal(),
xpc::DONT_FIRE_ONNEWGLOBALHOOK,
options,
&global);
NS_ENSURE_SUCCESS_VOID(rv);
NS_ENSURE_TRUE_VOID(global);
backstagePass->SetGlobalObject(global);
JSAutoCompartment ac(aCx, global);
if (!JS_DefineFunctions(aCx, global, gGlobalFun) ||
!JS_DefineProfilingFunctions(aCx, global)) {
return;
}
// Set the location information for the new global, so that tools like
// about:memory may use that information
xpc::SetLocationForGlobal(global, aLocation);
aGlobal.set(global);
}
bool
mozJSComponentLoader::ReuseGlobal(bool aIsAddon, nsIURI* aURI)
{
if (aIsAddon || !mShareLoaderGlobal)
return false;
nsCString spec;
NS_ENSURE_SUCCESS(aURI->GetSpec(spec), false);
// The loader calls Object.freeze on global properties, which
// causes problems if the global is shared with other code.
if (spec.EqualsASCII("resource://gre/modules/commonjs/toolkit/loader.js")) {
return false;
}
// Various tests call addDebuggerToGlobal on the result of
// importing this JSM, which would be annoying to fix.
if (spec.EqualsASCII("resource://gre/modules/jsdebugger.jsm")) {
return false;
}
// Some SpecialPowers jsms call Cu.forcePermissiveCOWs(),
// which sets a per-compartment flag that disables certain
// security wrappers, so don't use the shared global for them
// to avoid breaking tests.
if (FindInReadable(NS_LITERAL_CSTRING("chrome://specialpowers/"), spec)) {
return false;
}
return true;
}
JSObject*
mozJSComponentLoader::GetSharedGlobal(JSContext* aCx)
{
if (!mLoaderGlobal) {
JS::RootedObject globalObj(aCx);
CreateLoaderGlobal(aCx, NS_LITERAL_CSTRING("shared JSM global"),
nullptr, &globalObj);
// If we fail to create a module global this early, we're not going to
// get very far, so just bail out now.
MOZ_RELEASE_ASSERT(globalObj);
mLoaderGlobal = globalObj;
// AutoEntryScript required to invoke debugger hook, which is a
// Gecko-specific concept at present.
dom::AutoEntryScript aes(globalObj,
"component loader report global");
JS_FireOnNewGlobalObject(aes.cx(), globalObj);
}
return mLoaderGlobal;
}
JSObject*
mozJSComponentLoader::PrepareObjectForLocation(JSContext* aCx,
nsIFile* aComponentFile,
nsIURI* aURI,
bool* aReuseGlobal,
bool* aRealFile)
{
nsAutoCString nativePath;
NS_ENSURE_SUCCESS(aURI->GetSpec(nativePath), nullptr);
JSAddonId* addonId = MapURIToAddonID(aURI);
bool reuseGlobal = ReuseGlobal(!!addonId, aURI);
*aReuseGlobal = reuseGlobal;
bool createdNewGlobal = false;
RootedObject globalObj(aCx);
if (reuseGlobal) {
globalObj = GetSharedGlobal(aCx);
} else if (!globalObj) {
CreateLoaderGlobal(aCx, nativePath, addonId, &globalObj);
createdNewGlobal = true;
}
// |thisObj| is the object we set properties on for a particular .jsm.
RootedObject thisObj(aCx, globalObj);
NS_ENSURE_TRUE(thisObj, nullptr);
JSAutoCompartment ac(aCx, thisObj);
if (reuseGlobal) {
thisObj = js::NewJSMEnvironment(aCx);
NS_ENSURE_TRUE(thisObj, 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
nsresult rv = NS_OK;
nsCOMPtr<nsIFileURL> fileURL = do_QueryInterface(aURI, &rv);
nsCOMPtr<nsIFile> testFile;
if (NS_SUCCEEDED(rv)) {
fileURL->GetFile(getter_AddRefs(testFile));
}
if (testFile) {
*aRealFile = true;
if (XRE_IsParentProcess()) {
RootedObject locationObj(aCx);
rv = nsXPConnect::XPConnect()->WrapNative(aCx, thisObj, aComponentFile,
NS_GET_IID(nsIFile),
locationObj.address());
NS_ENSURE_SUCCESS(rv, nullptr);
NS_ENSURE_TRUE(locationObj, nullptr);
if (!JS_DefineProperty(aCx, thisObj, "__LOCATION__", locationObj, 0))
return 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, thisObj, "__URI__", exposedUri, 0))
return nullptr;
if (createdNewGlobal) {
// AutoEntryScript required to invoke debugger hook, which is a
// Gecko-specific concept at present.
dom::AutoEntryScript aes(globalObj,
"component loader report global");
JS_FireOnNewGlobalObject(aes.cx(), globalObj);
}
return thisObj;
}
nsresult
mozJSComponentLoader::ObjectForLocation(ComponentLoaderInfo& aInfo,
nsIFile* aComponentFile,
MutableHandleObject aObject,
MutableHandleScript aTableScript,
char** aLocation,
bool aPropagateExceptions,
MutableHandleValue aException)
{
MOZ_ASSERT(NS_IsMainThread(), "Must be on main thread.");
dom::AutoJSAPI jsapi;
jsapi.Init();
JSContext* cx = jsapi.cx();
bool realFile = false;
nsresult rv = aInfo.EnsureURI();
NS_ENSURE_SUCCESS(rv, rv);
bool reuseGlobal = false;
RootedObject obj(cx, PrepareObjectForLocation(cx, aComponentFile, aInfo.URI(),
&reuseGlobal, &realFile));
NS_ENSURE_TRUE(obj, NS_ERROR_FAILURE);
MOZ_ASSERT(JS_IsGlobalObject(obj) == !reuseGlobal);
JSAutoCompartment ac(cx, obj);
RootedScript script(cx);
nsAutoCString nativePath;
rv = aInfo.URI()->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();
aInfo.EnsureResolvedURI();
nsAutoCString cachePath(reuseGlobal ? JS_CACHE_PREFIX("non-syntactic")
: JS_CACHE_PREFIX("global"));
rv = PathifyURI(aInfo.ResolvedURI(), cachePath);
NS_ENSURE_SUCCESS(rv, rv);
script = ScriptPreloader::GetSingleton().GetCachedScript(cx, cachePath);
if (!script && cache) {
ReadCachedScript(cache, cachePath, cx, &script);
}
if (script) {
LOG(("Successfully loaded %s from startupcache\n", nativePath.get()));
} else if (cache) {
// 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;
// ReadCachedScript may have set a pending exception.
JS_ClearPendingException(cx);
}
if (!script) {
// The script wasn't in the cache , so compile it now.
LOG(("Slow loading %s\n", nativePath.get()));
// Use lazy source if we're using the startup cache. Non-lazy source +
// startup cache regresses installer size (due to source code stored in
// XDR encoded modules in omni.ja). Also, XDR decoding is relatively
// fast. When we're not using the startup cache, we want to use non-lazy
// source code so that we can use lazy parsing.
// See bug 1303754.
CompileOptions options(cx);
options.setNoScriptRval(true)
.maybeMakeStrictMode(true)
.setFileAndLine(nativePath.get(), 1)
.setSourceIsLazy(cache || ScriptPreloader::GetSingleton().Active());
if (realFile) {
AutoMemMap map;
MOZ_TRY(map.init(aComponentFile));
// Note: exceptions will get handled further down;
// don't early return for them here.
auto buf = map.get<char>();
if (reuseGlobal)
CompileForNonSyntacticScope(cx, options, buf.get(), map.size(), &script);
else
Compile(cx, options, buf.get(), map.size(), &script);
} else {
rv = aInfo.EnsureScriptChannel();
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIInputStream> scriptStream;
rv = NS_MaybeOpenChannelUsingOpen2(aInfo.ScriptChannel(),
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 */
auto buf = MakeUniqueFallible<char[]>(len + 1);
if (!buf)
return NS_ERROR_OUT_OF_MEMORY;
/* read the file in one swoop */
rv = scriptStream->Read(buf.get(), len, &bytesRead);
if (bytesRead != len)
return NS_BASE_STREAM_OSERROR;
buf[len] = '\0';
if (reuseGlobal)
CompileForNonSyntacticScope(cx, options, buf.get(), bytesRead, &script);
else
Compile(cx, options, buf.get(), bytesRead, &script);
}
// Propagate the exception, if one exists. Also, don't leave the stale
// exception on this context.
if (!script && aPropagateExceptions && jsapi.HasException()) {
if (!jsapi.StealException(aException))
return NS_ERROR_OUT_OF_MEMORY;
}
}
if (!script) {
return NS_ERROR_FAILURE;
}
ScriptPreloader::GetSingleton().NoteScript(nativePath, cachePath, script);
if (writeToCache) {
// We successfully compiled the script, so cache it.
rv = WriteCachedScript(cache, cachePath, cx, script);
// 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);
aTableScript.set(script);
{ // Scope for AutoEntryScript
// We're going to run script via JS_ExecuteScript, so we need an
// AutoEntryScript. This is Gecko-specific and not in any spec.
dom::AutoEntryScript aes(CurrentGlobalOrNull(cx),
"component loader load module");
JSContext* aescx = aes.cx();
bool executeOk = false;
if (JS_IsGlobalObject(obj)) {
JS::RootedValue rval(cx);
executeOk = JS::CloneAndExecuteScript(aescx, script, &rval);
} else {
executeOk = js::ExecuteInJSMEnvironment(aescx, script, obj);
}
if (!executeOk) {
if (aPropagateExceptions && aes.HasException()) {
// Ignore return value because we're returning an error code
// anyway.
Unused << aes.StealException(aException);
}
aObject.set(nullptr);
aTableScript.set(nullptr);
return NS_ERROR_FAILURE;
}
}
/* Freed when we remove from the table. */
*aLocation = ToNewCString(nativePath);
if (!*aLocation) {
aObject.set(nullptr);
aTableScript.set(nullptr);
return NS_ERROR_OUT_OF_MEMORY;
}
return NS_OK;
}
void
mozJSComponentLoader::UnloadModules()
{
mInitialized = false;
if (mLoaderGlobal) {
dom::AutoJSAPI jsapi;
jsapi.Init();
JSContext* cx = jsapi.cx();
RootedObject global(cx, mLoaderGlobal);
JSAutoCompartment ac(cx, global);
MOZ_ASSERT(JS_HasExtensibleLexicalEnvironment(global));
JS_SetAllNonReservedSlotsToUndefined(cx, JS_ExtensibleLexicalEnvironment(global));
JS_SetAllNonReservedSlotsToUndefined(cx, global);
mLoaderGlobal = nullptr;
}
mInProgressImports.Clear();
mImports.Clear();
mLocations.Clear();
for (auto iter = mModules.Iter(); !iter.Done(); iter.Next()) {
iter.Data()->Clear();
iter.Remove();
}
}
nsresult
mozJSComponentLoader::ImportInto(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 ReportOnCallerUTF8(cx, ERROR_SCOPE_OBJ,
PromiseFlatCString(registryLocation).get());
}
} else {
FindTargetObject(cx, &targetObject);
}
Maybe<JSAutoCompartment> ac;
if (targetObject) {
ac.emplace(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;
}
nsresult
mozJSComponentLoader::IsModuleLoaded(const nsACString& aLocation,
bool* retval)
{
MOZ_ASSERT(nsContentUtils::IsCallerChrome());
nsresult rv;
if (!mInitialized) {
rv = ReallyInit();
NS_ENSURE_SUCCESS(rv, rv);
}
ComponentLoaderInfo info(aLocation);
rv = info.EnsureKey();
NS_ENSURE_SUCCESS(rv, rv);
*retval = !!mImports.Get(info.Key());
return NS_OK;
}
NS_IMETHODIMP mozJSComponentLoader::LoadedModules(uint32_t* length,
char*** aModules)
{
char** modules = new char*[mImports.Count()];
*length = mImports.Count();
*aModules = modules;
for (auto iter = mImports.Iter(); !iter.Done(); iter.Next()) {
*modules = NS_strdup(iter.Data()->location);
modules++;
}
return NS_OK;
}
NS_IMETHODIMP mozJSComponentLoader::LoadedComponents(uint32_t* length,
char*** aComponents)
{
char** comp = new char*[mModules.Count()];
*length = mModules.Count();
*aComponents = comp;
for (auto iter = mModules.Iter(); !iter.Done(); iter.Next()) {
*comp = NS_strdup(iter.Data()->location);
comp++;
}
return NS_OK;
}
NS_IMETHODIMP
mozJSComponentLoader::GetModuleImportStack(const nsACString& aLocation,
nsACString& retval)
{
#ifdef STARTUP_RECORDER_ENABLED
MOZ_ASSERT(nsContentUtils::IsCallerChrome());
MOZ_ASSERT(mInitialized);
ComponentLoaderInfo info(aLocation);
nsresult rv = info.EnsureKey();
NS_ENSURE_SUCCESS(rv, rv);
ModuleEntry* mod;
if (!mImports.Get(info.Key(), &mod))
return NS_ERROR_FAILURE;
retval = mod->importStack;
return NS_OK;
#else
return NS_ERROR_NOT_IMPLEMENTED;
#endif
}
NS_IMETHODIMP
mozJSComponentLoader::GetComponentLoadStack(const nsACString& aLocation,
nsACString& retval)
{
#ifdef STARTUP_RECORDER_ENABLED
MOZ_ASSERT(nsContentUtils::IsCallerChrome());
MOZ_ASSERT(mInitialized);
ComponentLoaderInfo info(aLocation);
nsresult rv = info.EnsureURI();
NS_ENSURE_SUCCESS(rv, rv);
ModuleEntry* mod;
if (!mModules.Get(info.Key(), &mod))
return NS_ERROR_FAILURE;
retval = mod->importStack;
return NS_OK;
#else
return NS_ERROR_NOT_IMPLEMENTED;
#endif
}
static JSObject*
ResolveModuleObjectPropertyById(JSContext* aCx, HandleObject aModObj, HandleId id)
{
if (JS_HasExtensibleLexicalEnvironment(aModObj)) {
RootedObject lexical(aCx, JS_ExtensibleLexicalEnvironment(aModObj));
bool found;
if (!JS_HasOwnPropertyById(aCx, lexical, id, &found)) {
return nullptr;
}
if (found) {
return lexical;
}
}
return aModObj;
}
nsresult
mozJSComponentLoader::ImportInto(const nsACString& aLocation,
HandleObject targetObj,
JSContext* cx,
MutableHandleObject vp)
{
vp.set(nullptr);
JS::RootedObject exports(cx);
MOZ_TRY(Import(cx, aLocation, vp, &exports, !targetObj));
if (targetObj) {
JS::Rooted<JS::IdVector> ids(cx, JS::IdVector(cx));
if (!JS_Enumerate(cx, exports, &ids)) {
return NS_ERROR_OUT_OF_MEMORY;
}
JS::RootedValue value(cx);
JS::RootedId id(cx);
for (jsid idVal : ids) {
id = idVal;
if (!JS_GetPropertyById(cx, exports, id, &value) ||
!JS_SetPropertyById(cx, targetObj, id, value)) {
return NS_ERROR_FAILURE;
}
}
}
return NS_OK;
}
nsresult
mozJSComponentLoader::ExtractExports(JSContext* aCx, ComponentLoaderInfo& aInfo,
ModuleEntry* aMod,
JS::MutableHandleObject aExports)
{
// cxhelper must be created before jsapi, so that jsapi is destroyed and
// pops any context it has pushed before we report to the caller context.
JSCLContextHelper cxhelper(aCx);
// Even though we are calling JS_SetPropertyById on targetObj, we want
// to ensure that we never run script here, so we use an AutoJSAPI and
// not an AutoEntryScript.
dom::AutoJSAPI jsapi;
jsapi.Init();
JSContext* cx = jsapi.cx();
JSAutoCompartment ac(cx, aMod->obj);
RootedValue symbols(cx);
{
RootedObject obj(cx, ResolveModuleObjectProperty(cx, aMod->obj,
"EXPORTED_SYMBOLS"));
if (!obj || !JS_GetProperty(cx, obj, "EXPORTED_SYMBOLS", &symbols)) {
return ReportOnCallerUTF8(cxhelper, ERROR_NOT_PRESENT, aInfo);
}
}
bool isArray;
if (!JS_IsArrayObject(cx, symbols, &isArray)) {
return NS_ERROR_FAILURE;
}
if (!isArray) {
return ReportOnCallerUTF8(cxhelper, ERROR_NOT_AN_ARRAY, aInfo);
}
RootedObject symbolsObj(cx, &symbols.toObject());
// Iterate over symbols array, installing symbols on targetObj:
uint32_t symbolCount = 0;
if (!JS_GetArrayLength(cx, symbolsObj, &symbolCount)) {
return ReportOnCallerUTF8(cxhelper, ERROR_GETTING_ARRAY_LENGTH,
aInfo);
}
#ifdef DEBUG
nsAutoCString logBuffer;
#endif
aExports.set(JS_NewPlainObject(cx));
if (!aExports) {
return NS_ERROR_OUT_OF_MEMORY;
}
bool missing = false;
RootedValue value(cx);
RootedId symbolId(cx);
RootedObject symbolHolder(cx);
for (uint32_t i = 0; i < symbolCount; ++i) {
if (!JS_GetElement(cx, symbolsObj, i, &value) ||
!value.isString() ||
!JS_ValueToId(cx, value, &symbolId)) {
return ReportOnCallerUTF8(cxhelper, ERROR_ARRAY_ELEMENT, aInfo, i);
}
symbolHolder = ResolveModuleObjectPropertyById(cx, aMod->obj, symbolId);
if (!symbolHolder ||
!JS_GetPropertyById(cx, symbolHolder, symbolId, &value)) {
JSAutoByteString bytes;
RootedString symbolStr(cx, JSID_TO_STRING(symbolId));
if (!bytes.encodeUtf8(cx, symbolStr))
return NS_ERROR_FAILURE;
return ReportOnCallerUTF8(cxhelper, ERROR_GETTING_SYMBOL,
aInfo, bytes.ptr());
}
if (value.isUndefined()) {
missing = true;
}
if (!JS_SetPropertyById(cx, aExports, symbolId, value)) {
JSAutoByteString bytes;
RootedString symbolStr(cx, JSID_TO_STRING(symbolId));
if (!bytes.encodeUtf8(cx, symbolStr))
return NS_ERROR_FAILURE;
return ReportOnCallerUTF8(cxhelper, ERROR_GETTING_SYMBOL,
aInfo, bytes.ptr());
}
#ifdef DEBUG
if (i == 0) {
logBuffer.AssignLiteral("Installing symbols [ ");
}
JSAutoByteString bytes(cx, JSID_TO_STRING(symbolId));
if (!!bytes)
logBuffer.Append(bytes.ptr());
logBuffer.Append(' ');
if (i == symbolCount - 1) {
nsCString location;
MOZ_TRY(aInfo.GetLocation(location));
LOG(("%s] from %s\n", logBuffer.get(), location.get()));
}
#endif
}
// Don't cache the exports object if any of its exported symbols are
// missing. If the module hasn't finished loading yet, they may be
// defined the next time we try to import it.
if (!missing) {
aMod->exports = aExports;
}
return NS_OK;
}
nsresult
mozJSComponentLoader::Import(JSContext* aCx, const nsACString& aLocation,
JS::MutableHandleObject aModuleGlobal,
JS::MutableHandleObject aModuleExports,
bool aIgnoreExports)
{
nsresult rv;
if (!mInitialized) {
rv = ReallyInit();
NS_ENSURE_SUCCESS(rv, rv);
}
ComponentLoaderInfo info(aLocation);
rv = info.EnsureKey();
NS_ENSURE_SUCCESS(rv, rv);
ModuleEntry* mod;
nsAutoPtr<ModuleEntry> newEntry;
if (!mImports.Get(info.Key(), &mod) && !mInProgressImports.Get(info.Key(), &mod)) {
newEntry = new ModuleEntry(RootingContext::get(aCx));
if (!newEntry)
return NS_ERROR_OUT_OF_MEMORY;
// Note: This implies EnsureURI().
MOZ_TRY(info.EnsureResolvedURI());
// get the JAR if there is one
nsCOMPtr<nsIJARURI> jarURI;
jarURI = do_QueryInterface(info.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(info.ResolvedURI(), &rv);
NS_ENSURE_SUCCESS(rv, rv);
}
nsCOMPtr<nsIFile> sourceFile;
rv = baseFileURL->GetFile(getter_AddRefs(sourceFile));
NS_ENSURE_SUCCESS(rv, rv);
rv = info.ResolvedURI()->GetSpec(newEntry->resolvedURL);
NS_ENSURE_SUCCESS(rv, rv);
nsCString* existingPath;
if (mLocations.Get(newEntry->resolvedURL, &existingPath) && *existingPath != info.Key()) {
return NS_ERROR_UNEXPECTED;
}
mLocations.Put(newEntry->resolvedURL, new nsCString(info.Key()));
RootedValue exception(aCx);
{
mInProgressImports.Put(info.Key(), newEntry);
auto cleanup = MakeScopeExit([&] () {
mInProgressImports.Remove(info.Key());
});
rv = ObjectForLocation(info, sourceFile, &newEntry->obj,
&newEntry->thisObjectKey,
&newEntry->location, true, &exception);
}
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(aCx, &exception))
return NS_ERROR_OUT_OF_MEMORY;
JS_SetPendingException(aCx, exception);
return NS_ERROR_FAILURE;
}
// Something failed, but we don't know what it is, guess.
return NS_ERROR_FILE_NOT_FOUND;
}
#ifdef STARTUP_RECORDER_ENABLED
if (Preferences::GetBool("browser.startup.record", false)) {
newEntry->importStack =
xpc_PrintJSStack(aCx, false, false, false).get();
}
#endif
mod = newEntry;
}
MOZ_ASSERT(mod->obj, "Import table contains entry with no object");
aModuleGlobal.set(mod->obj);
JS::RootedObject exports(aCx, mod->exports);
if (!exports && !aIgnoreExports) {
MOZ_TRY(ExtractExports(aCx, info, mod, &exports));
}
if (exports && !JS_WrapObject(aCx, &exports)) {
return NS_ERROR_FAILURE;
}
aModuleExports.set(exports);
// Cache this module for later
if (newEntry) {
mImports.Put(info.Key(), newEntry);
newEntry.forget();
}
return NS_OK;
}
nsresult
mozJSComponentLoader::Unload(const nsACString & aLocation)
{
nsresult rv;
if (!mInitialized) {
return NS_OK;
}
ComponentLoaderInfo info(aLocation);
rv = info.EnsureKey();
NS_ENSURE_SUCCESS(rv, rv);
ModuleEntry* mod;
if (mImports.Get(info.Key(), &mod)) {
mLocations.Remove(mod->resolvedURL);
mImports.Remove(info.Key());
}
// If this is the last module to be unloaded, we will leak mLoaderGlobal
// until UnloadModules is called. So be it.
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)
{
}
JSCLContextHelper::~JSCLContextHelper()
{
if (mBuf) {
JS_ReportErrorUTF8(mContext, "%s", mBuf.get());
}
}
void
JSCLContextHelper::reportErrorAfterPop(UniqueChars&& buf)
{
MOZ_ASSERT(!mBuf, "Already called reportErrorAfterPop");
mBuf = Move(buf);
}
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