/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* vim: set ts=2 sw=2 et tw=78: */ /* ***** BEGIN LICENSE BLOCK ***** * Version: MPL 1.1/GPL 2.0/LGPL 2.1 * * The contents of this file are subject to the Mozilla Public License Version * 1.1 (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * http://www.mozilla.org/MPL/ * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the * License. * * The Original Code is mozilla.org code. * * The Initial Developer of the Original Code is * Netscape Communications Corporation. * Portions created by the Initial Developer are Copyright (C) 1998 * the Initial Developer. All Rights Reserved. * * Contributor(s): * Mark Hammond * * Alternatively, the contents of this file may be used under the terms of * either of the GNU General Public License Version 2 or later (the "GPL"), * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), * in which case the provisions of the GPL or the LGPL are applicable instead * of those above. If you wish to allow use of your version of this file only * under the terms of either the GPL or the LGPL, and not to allow others to * use your version of this file under the terms of the MPL, indicate your * decision by deleting the provisions above and replace them with the notice * and other provisions required by the GPL or the LGPL. If you do not delete * the provisions above, a recipient may use your version of this file under * the terms of any one of the MPL, the GPL or the LGPL. * * ***** END LICENSE BLOCK ***** */ #include "nsJSEnvironment.h" #include "nsIScriptGlobalObject.h" #include "nsIScriptObjectPrincipal.h" #include "nsIDOMChromeWindow.h" #include "nsPIDOMWindow.h" #include "nsIDOMNode.h" #include "nsIDOMElement.h" #include "nsIDOMDocument.h" #include "nsIDOMText.h" #include "nsIDOMAttr.h" #include "nsIDOMNamedNodeMap.h" #include "nsIDOMNodeList.h" #include "nsIDOMKeyEvent.h" #include "nsIDOMHTMLImageElement.h" #include "nsIDOMHTMLOptionElement.h" #include "nsIScriptSecurityManager.h" #include "nsDOMCID.h" #include "nsIServiceManager.h" #include "nsIXPConnect.h" #include "nsIJSContextStack.h" #include "nsIJSRuntimeService.h" #include "nsCOMPtr.h" #include "nsISupportsPrimitives.h" #include "nsReadableUtils.h" #include "nsJSUtils.h" #include "nsIDocShell.h" #include "nsIDocShellTreeItem.h" #include "nsPresContext.h" #include "nsIConsoleService.h" #include "nsIScriptError.h" #include "nsIInterfaceRequestor.h" #include "nsIInterfaceRequestorUtils.h" #include "nsIPrompt.h" #include "nsIObserverService.h" #include "nsGUIEvent.h" #include "nsThreadUtils.h" #include "nsITimer.h" #include "nsIAtom.h" #include "nsContentUtils.h" #include "jscntxt.h" #include "nsEventDispatcher.h" #include "nsIContent.h" #include "nsCycleCollector.h" #include "nsNetUtil.h" #include "nsXPCOMCIDInternal.h" #include "nsIXULRuntime.h" // For locale aware string methods #include "plstr.h" #include "nsIPlatformCharset.h" #include "nsICharsetConverterManager.h" #include "nsUnicharUtils.h" #include "nsILocaleService.h" #include "nsICollation.h" #include "nsCollationCID.h" #include "nsDOMClassInfo.h" #include "jsdbgapi.h" // for JS_ClearWatchPointsForObject #include "jsxdrapi.h" #include "nsIArray.h" #include "nsIObjectInputStream.h" #include "nsIObjectOutputStream.h" #include "nsITimelineService.h" #include "nsDOMScriptObjectHolder.h" #include "prmem.h" #ifdef NS_DEBUG #include "nsGlobalWindow.h" #endif #ifdef MOZ_JSDEBUGGER #include "jsdIDebuggerService.h" #endif #ifdef MOZ_LOGGING // Force PR_LOGGING so we can get JS strict warnings even in release builds #define FORCE_PR_LOG 1 #endif #include "prlog.h" #include "prthread.h" const size_t gStackSize = 8192; #ifdef PR_LOGGING static PRLogModuleInfo* gJSDiagnostics; #endif // Thank you Microsoft! #ifndef WINCE #ifdef CompareString #undef CompareString #endif #endif // WINCE // The amount of time we wait between a request to GC (due to leaving // a page) and doing the actual GC. #define NS_GC_DELAY 2000 // ms // The amount of time we wait until we force a GC in case the previous // GC timer happened to fire while we were in the middle of loading a // page (we'll GC once the page is loaded if that happens before this // amount of time has passed). #define NS_LOAD_IN_PROCESS_GC_DELAY 4000 // ms // The amount of time we wait from the first request to GC to actually // doing the first GC. #define NS_FIRST_GC_DELAY 10000 // ms #define JAVASCRIPT nsIProgrammingLanguage::JAVASCRIPT // The max number of delayed cycle collects.. #define NS_MAX_DELAYED_CCOLLECT 45 // The max number of user interaction notifications in inactive state before // we try to call cycle collector more aggressively. #define NS_CC_SOFT_LIMIT_INACTIVE 6 // The max number of user interaction notifications in active state before // we try to call cycle collector more aggressively. #define NS_CC_SOFT_LIMIT_ACTIVE 12 // When higher probability MaybeCC is used, the number of sDelayedCCollectCount // is multiplied with this number. #define NS_PROBABILITY_MULTIPLIER 3 // Cycle collector is never called more often than every NS_MIN_CC_INTERVAL // milliseconds. Exceptions are low memory situation and memory pressure // notification. #define NS_MIN_CC_INTERVAL 10000 // ms // If previous cycle collection collected more than this number of objects, // the next collection will happen somewhat soon. #define NS_COLLECTED_OBJECTS_LIMIT 5000 // CC will be called if GC has been called at least this number of times and // there are at least NS_MIN_SUSPECT_CHANGES new suspected objects. #define NS_MAX_GC_COUNT 5 #define NS_MIN_SUSPECT_CHANGES 10 // CC will be called if there are at least NS_MAX_SUSPECT_CHANGES new suspected // objects. #define NS_MAX_SUSPECT_CHANGES 100 // if you add statics here, add them to the list in nsJSRuntime::Startup static PRUint32 sDelayedCCollectCount; static PRUint32 sCCollectCount; static PRBool sUserIsActive; static PRTime sPreviousCCTime; static PRUint32 sCollectedObjectsCounts; static PRUint32 sSavedGCCount; static PRUint32 sCCSuspectChanges; static PRUint32 sCCSuspectedCount; static nsITimer *sGCTimer; static PRBool sReadyForGC; // The number of currently pending document loads. This count isn't // guaranteed to always reflect reality and can't easily as we don't // have an easy place to know when a load ends or is interrupted in // all cases. This counter also gets reset if we end up GC'ing while // we're waiting for a slow page to load. IOW, this count may be 0 // even when there are pending loads. static PRUint32 sPendingLoadCount; // Boolean that tells us whether or not the current GC timer // (sGCTimer) was scheduled due to a GC timer firing while we were in // the middle of loading a page. static PRBool sLoadInProgressGCTimer; nsScriptNameSpaceManager *gNameSpaceManager; static nsIJSRuntimeService *sRuntimeService; JSRuntime *nsJSRuntime::sRuntime; static const char kJSRuntimeServiceContractID[] = "@mozilla.org/js/xpc/RuntimeService;1"; static JSGCCallback gOldJSGCCallback; static PRBool sIsInitialized; static PRBool sDidShutdown; static PRInt32 sContextCount; static PRTime sMaxScriptRunTime; static PRTime sMaxChromeScriptRunTime; static nsIScriptSecurityManager *sSecurityManager; static nsICollation *gCollation; static nsIUnicodeDecoder *gDecoder; // nsUserActivityObserver observes user-interaction-active and // user-interaction-inactive notifications. It counts the number of // notifications and if the number is bigger than NS_CC_SOFT_LIMIT_ACTIVE // (in case the current notification is user-interaction-active) or // NS_CC_SOFT_LIMIT_INACTIVE (current notification is user-interaction-inactive) // MaybeCC is called with aHigherParameter set to PR_TRUE, otherwise PR_FALSE. // // When moving from active state to inactive, nsJSContext::IntervalCC() is // called unless the timer related to page load is active. class nsUserActivityObserver : public nsIObserver { public: nsUserActivityObserver() : mUserActivityCounter(0), mOldCCollectCount(0) {} NS_DECL_ISUPPORTS NS_DECL_NSIOBSERVER private: PRUint32 mUserActivityCounter; PRUint32 mOldCCollectCount; }; NS_IMPL_ISUPPORTS1(nsUserActivityObserver, nsIObserver) NS_IMETHODIMP nsUserActivityObserver::Observe(nsISupports* aSubject, const char* aTopic, const PRUnichar* aData) { if (mOldCCollectCount != sCCollectCount) { mOldCCollectCount = sCCollectCount; // Cycle collector was called between user interaction notifications, so // we can reset the counter. mUserActivityCounter = 0; } PRBool higherProbability = PR_FALSE; ++mUserActivityCounter; if (!strcmp(aTopic, "user-interaction-inactive")) { #ifdef DEBUG_smaug printf("user-interaction-inactive\n"); #endif if (sUserIsActive) { sUserIsActive = PR_FALSE; if (!sGCTimer) { nsJSContext::IntervalCC(); return NS_OK; } } higherProbability = (mUserActivityCounter > NS_CC_SOFT_LIMIT_INACTIVE); } else if (!strcmp(aTopic, "user-interaction-active")) { #ifdef DEBUG_smaug printf("user-interaction-active\n"); #endif sUserIsActive = PR_TRUE; higherProbability = (mUserActivityCounter > NS_CC_SOFT_LIMIT_ACTIVE); } else if (!strcmp(aTopic, "xpcom-shutdown")) { nsCOMPtr obs = do_GetService("@mozilla.org/observer-service;1"); if (obs) { obs->RemoveObserver(this, "user-interaction-active"); obs->RemoveObserver(this, "user-interaction-inactive"); obs->RemoveObserver(this, "xpcom-shutdown"); } return NS_OK; } nsJSContext::MaybeCC(higherProbability); return NS_OK; } // nsCCMemoryPressureObserver observes the memory-pressure notifications // and forces a cycle collection when it happens. class nsCCMemoryPressureObserver : public nsIObserver { public: NS_DECL_ISUPPORTS NS_DECL_NSIOBSERVER }; NS_IMPL_ISUPPORTS1(nsCCMemoryPressureObserver, nsIObserver) NS_IMETHODIMP nsCCMemoryPressureObserver::Observe(nsISupports* aSubject, const char* aTopic, const PRUnichar* aData) { nsJSContext::CC(); return NS_OK; } class nsJSVersionSetter { public: nsJSVersionSetter(JSContext *aContext, PRUint32 aVersion); ~nsJSVersionSetter(); private: JSContext* mContext; uint32 mOldOptions; JSVersion mOldVersion; JSBool mOptionsChanged; }; nsJSVersionSetter::nsJSVersionSetter(JSContext *aContext, PRUint32 aVersion) : mContext(aContext) { // JSVERSION_HAS_XML may be set in our version mask - however, we can't // simply pass this directly to JS_SetOptions as it masks out that bit - // the only way to make this happen is via JS_SetOptions. JSBool hasxml = (aVersion & JSVERSION_HAS_XML) != 0; mOldOptions = ::JS_GetOptions(mContext); mOptionsChanged = ((hasxml) ^ !!(mOldOptions & JSOPTION_XML)); if (mOptionsChanged) { ::JS_SetOptions(mContext, hasxml ? mOldOptions | JSOPTION_XML : mOldOptions & ~JSOPTION_XML); } // Change the version - this is cheap when the versions match, so no need // to optimize here... JSVersion newVer = (JSVersion)(aVersion & JSVERSION_MASK); mOldVersion = ::JS_SetVersion(mContext, newVer); } nsJSVersionSetter::~nsJSVersionSetter() { ::JS_SetVersion(mContext, mOldVersion); if (mOptionsChanged) { ::JS_SetOptions(mContext, mOldOptions); } } /**************************************************************** ************************** AutoFree **************************** ****************************************************************/ class AutoFree { public: AutoFree(void *aPtr) : mPtr(aPtr) { } ~AutoFree() { if (mPtr) nsMemory::Free(mPtr); } void Invalidate() { mPtr = 0; } private: void *mPtr; }; class AutoFreeJSStack { public: AutoFreeJSStack(JSContext *ctx, void *aPtr) : mContext(ctx), mStack(aPtr) { } JS_REQUIRES_STACK ~AutoFreeJSStack() { if (mContext && mStack) js_FreeStack(mContext, mStack); } private: JSContext *mContext; void *mStack; }; // A utility function for script languages to call. Although it looks small, // the use of nsIDocShell and nsPresContext triggers a huge number of // dependencies that most languages would not otherwise need. // XXXmarkh - This function is mis-placed! PRBool NS_HandleScriptError(nsIScriptGlobalObject *aScriptGlobal, nsScriptErrorEvent *aErrorEvent, nsEventStatus *aStatus) { PRBool called = PR_FALSE; nsCOMPtr win(do_QueryInterface(aScriptGlobal)); nsIDocShell *docShell = win ? win->GetDocShell() : nsnull; if (docShell) { nsCOMPtr presContext; docShell->GetPresContext(getter_AddRefs(presContext)); static PRInt32 errorDepth; // Recursion prevention ++errorDepth; if (presContext && errorDepth < 2) { // Dispatch() must be synchronous for the recursion block // (errorDepth) to work. nsEventDispatcher::Dispatch(win, presContext, aErrorEvent, nsnull, aStatus); called = PR_TRUE; } --errorDepth; } return called; } // NOTE: This function could be refactored to use the above. The only reason // it has not been done is that the code below only fills the error event // after it has a good nsPresContext - whereas using the above function // would involve always filling it. Is that a concern? void NS_ScriptErrorReporter(JSContext *cx, const char *message, JSErrorReport *report) { // We don't want to report exceptions too eagerly, but warnings in the // absence of werror are swallowed whole, so report those now. if (!JSREPORT_IS_WARNING(report->flags)) { JSStackFrame * fp = nsnull; while ((fp = JS_FrameIterator(cx, &fp))) { if (!JS_IsNativeFrame(cx, fp)) { return; } } nsIXPConnect* xpc = nsContentUtils::XPConnect(); if (xpc) { nsAXPCNativeCallContext *cc = nsnull; xpc->GetCurrentNativeCallContext(&cc); if (cc) { nsAXPCNativeCallContext *prev = cc; while (NS_SUCCEEDED(prev->GetPreviousCallContext(&prev)) && prev) { PRUint16 lang; if (NS_SUCCEEDED(prev->GetLanguage(&lang)) && lang == nsAXPCNativeCallContext::LANG_JS) { return; } } } } } // XXX this means we are not going to get error reports on non DOM contexts nsIScriptContext *context = nsJSUtils::GetDynamicScriptContext(cx); nsEventStatus status = nsEventStatus_eIgnore; // Note: we must do this before running any more code on cx (if cx is the // dynamic script context). ::JS_ClearPendingException(cx); if (context) { nsIScriptGlobalObject *globalObject = context->GetGlobalObject(); if (globalObject) { nsAutoString fileName, msg; NS_NAMED_LITERAL_STRING(xoriginMsg, "Script error."); fileName.AssignWithConversion(report->filename); const PRUnichar *m = reinterpret_cast (report->ucmessage); if (m) { msg.Assign(m); } if (msg.IsEmpty() && message) { msg.AssignWithConversion(message); } // First, notify the DOM that we have a script error. /* We do not try to report Out Of Memory via a dom * event because the dom event handler would encounter * an OOM exception trying to process the event, and * then we'd need to generate a new OOM event for that * new OOM instance -- this isn't pretty. */ { // Scope to make sure we're not using |win| in the rest of // this function when we should be using |globalObject|. We // only need |win| for the event dispatch. nsCOMPtr win(do_QueryInterface(globalObject)); nsIDocShell *docShell = win ? win->GetDocShell() : nsnull; if (docShell && (report->errorNumber != JSMSG_OUT_OF_MEMORY && !JSREPORT_IS_WARNING(report->flags))) { static PRInt32 errorDepth; // Recursion prevention ++errorDepth; nsCOMPtr presContext; docShell->GetPresContext(getter_AddRefs(presContext)); if (presContext && errorDepth < 2) { nsScriptErrorEvent errorevent(PR_TRUE, NS_LOAD_ERROR); errorevent.fileName = fileName.get(); nsCOMPtr sop(do_QueryInterface(win)); nsIPrincipal *p = sop->GetPrincipal(); PRBool sameOrigin = (report->filename == nsnull); if (p && !sameOrigin) { nsCOMPtr errorURI; NS_NewURI(getter_AddRefs(errorURI), report->filename); if (errorURI) { // FIXME: Once error reports contain the origin of the // error (principals) we should change this to do the // security check based on the principals and not // URIs. See bug 387476. sameOrigin = NS_SUCCEEDED(p->CheckMayLoad(errorURI, PR_FALSE)); } } if (sameOrigin) { errorevent.errorMsg = msg.get(); errorevent.lineNr = report->lineno; } else { errorevent.errorMsg = xoriginMsg.get(); errorevent.lineNr = 0; } // Dispatch() must be synchronous for the recursion block // (errorDepth) to work. nsEventDispatcher::Dispatch(win, presContext, &errorevent, nsnull, &status); } --errorDepth; } } if (status != nsEventStatus_eConsumeNoDefault) { // Make an nsIScriptError and populate it with information from // this error. nsCOMPtr errorObject = do_CreateInstance("@mozilla.org/scripterror;1"); if (errorObject != nsnull) { nsresult rv = NS_ERROR_NOT_AVAILABLE; // Set category to chrome or content nsCOMPtr scriptPrincipal = do_QueryInterface(globalObject); NS_ASSERTION(scriptPrincipal, "Global objects must implement " "nsIScriptObjectPrincipal"); nsCOMPtr systemPrincipal; sSecurityManager->GetSystemPrincipal(getter_AddRefs(systemPrincipal)); const char * category = scriptPrincipal->GetPrincipal() == systemPrincipal ? "chrome javascript" : "content javascript"; PRUint32 column = report->uctokenptr - report->uclinebuf; rv = errorObject->Init(msg.get(), fileName.get(), reinterpret_cast (report->uclinebuf), report->lineno, column, report->flags, category); if (NS_SUCCEEDED(rv)) { nsCOMPtr consoleService = do_GetService(NS_CONSOLESERVICE_CONTRACTID, &rv); if (NS_SUCCEEDED(rv)) { consoleService->LogMessage(errorObject); } } } } } } #ifdef DEBUG // Print it to stderr as well, for the benefit of those invoking // mozilla with -console. nsCAutoString error; error.Assign("JavaScript "); if (JSREPORT_IS_STRICT(report->flags)) error.Append("strict "); if (JSREPORT_IS_WARNING(report->flags)) error.Append("warning: "); else error.Append("error: "); error.Append(report->filename); error.Append(", line "); error.AppendInt(report->lineno, 10); error.Append(": "); if (report->ucmessage) { AppendUTF16toUTF8(reinterpret_cast(report->ucmessage), error); } else { error.Append(message); } if (status != nsEventStatus_eIgnore && !JSREPORT_IS_WARNING(report->flags)) error.Append(" Error was suppressed by event handler\n"); fprintf(stderr, "%s\n", error.get()); fflush(stderr); #endif #ifdef PR_LOGGING if (!gJSDiagnostics) gJSDiagnostics = PR_NewLogModule("JSDiagnostics"); if (gJSDiagnostics) { PR_LOG(gJSDiagnostics, JSREPORT_IS_WARNING(report->flags) ? PR_LOG_WARNING : PR_LOG_ERROR, ("file %s, line %u: %s\n%s%s", report->filename, report->lineno, message, report->linebuf ? report->linebuf : "", (report->linebuf && report->linebuf[strlen(report->linebuf)-1] != '\n') ? "\n" : "")); } #endif } static JSBool LocaleToUnicode(JSContext *cx, char *src, jsval *rval) { nsresult rv; if (!gDecoder) { // use app default locale nsCOMPtr localeService = do_GetService(NS_LOCALESERVICE_CONTRACTID, &rv); if (NS_SUCCEEDED(rv)) { nsCOMPtr appLocale; rv = localeService->GetApplicationLocale(getter_AddRefs(appLocale)); if (NS_SUCCEEDED(rv)) { nsAutoString localeStr; rv = appLocale-> GetCategory(NS_LITERAL_STRING(NSILOCALE_TIME), localeStr); NS_ASSERTION(NS_SUCCEEDED(rv), "failed to get app locale info"); nsCOMPtr platformCharset = do_GetService(NS_PLATFORMCHARSET_CONTRACTID, &rv); if (NS_SUCCEEDED(rv)) { nsCAutoString charset; rv = platformCharset->GetDefaultCharsetForLocale(localeStr, charset); if (NS_SUCCEEDED(rv)) { // get/create unicode decoder for charset nsCOMPtr ccm = do_GetService(NS_CHARSETCONVERTERMANAGER_CONTRACTID, &rv); if (NS_SUCCEEDED(rv)) ccm->GetUnicodeDecoder(charset.get(), &gDecoder); } } } } } JSString *str = nsnull; PRInt32 srcLength = PL_strlen(src); if (gDecoder) { PRInt32 unicharLength = srcLength; PRUnichar *unichars = (PRUnichar *)JS_malloc(cx, (srcLength + 1) * sizeof(PRUnichar)); if (unichars) { rv = gDecoder->Convert(src, &srcLength, unichars, &unicharLength); if (NS_SUCCEEDED(rv)) { // terminate the returned string unichars[unicharLength] = 0; // nsIUnicodeDecoder::Convert may use fewer than srcLength PRUnichars if (unicharLength + 1 < srcLength + 1) { PRUnichar *shrunkUnichars = (PRUnichar *)JS_realloc(cx, unichars, (unicharLength + 1) * sizeof(PRUnichar)); if (shrunkUnichars) unichars = shrunkUnichars; } str = JS_NewUCString(cx, reinterpret_cast(unichars), unicharLength); } if (!str) JS_free(cx, unichars); } } if (!str) { nsDOMClassInfo::ThrowJSException(cx, NS_ERROR_OUT_OF_MEMORY); return JS_FALSE; } *rval = STRING_TO_JSVAL(str); return JS_TRUE; } static JSBool ChangeCase(JSContext *cx, JSString *src, jsval *rval, void(* changeCaseFnc)(const nsAString&, nsAString&)) { nsAutoString result; changeCaseFnc(nsDependentJSString(src), result); JSString *ucstr = JS_NewUCStringCopyN(cx, (jschar*)result.get(), result.Length()); if (!ucstr) { return JS_FALSE; } *rval = STRING_TO_JSVAL(ucstr); return JS_TRUE; } static JSBool LocaleToUpperCase(JSContext *cx, JSString *src, jsval *rval) { return ChangeCase(cx, src, rval, ToUpperCase); } static JSBool LocaleToLowerCase(JSContext *cx, JSString *src, jsval *rval) { return ChangeCase(cx, src, rval, ToLowerCase); } static JSBool LocaleCompare(JSContext *cx, JSString *src1, JSString *src2, jsval *rval) { nsresult rv; if (!gCollation) { nsCOMPtr localeService = do_GetService(NS_LOCALESERVICE_CONTRACTID, &rv); if (NS_SUCCEEDED(rv)) { nsCOMPtr locale; rv = localeService->GetApplicationLocale(getter_AddRefs(locale)); if (NS_SUCCEEDED(rv)) { nsCOMPtr colFactory = do_CreateInstance(NS_COLLATIONFACTORY_CONTRACTID, &rv); if (NS_SUCCEEDED(rv)) { rv = colFactory->CreateCollation(locale, &gCollation); } } } if (NS_FAILED(rv)) { nsDOMClassInfo::ThrowJSException(cx, rv); return JS_FALSE; } } PRInt32 result; rv = gCollation->CompareString(nsICollation::kCollationStrengthDefault, nsDependentJSString(src1), nsDependentJSString(src2), &result); if (NS_FAILED(rv)) { nsDOMClassInfo::ThrowJSException(cx, rv); return JS_FALSE; } *rval = INT_TO_JSVAL(result); return JS_TRUE; } #ifdef DEBUG // A couple of useful functions to call when you're debugging. nsGlobalWindow * JSObject2Win(JSContext *cx, JSObject *obj) { nsIXPConnect *xpc = nsContentUtils::XPConnect(); if (!xpc) { return nsnull; } nsCOMPtr wrapper; xpc->GetWrappedNativeOfJSObject(cx, obj, getter_AddRefs(wrapper)); if (wrapper) { nsCOMPtr win = do_QueryWrappedNative(wrapper); if (win) { return static_cast (static_cast(win)); } } return nsnull; } void PrintWinURI(nsGlobalWindow *win) { if (!win) { printf("No window passed in.\n"); return; } nsCOMPtr doc = do_QueryInterface(win->GetExtantDocument()); if (!doc) { printf("No document in the window.\n"); return; } nsIURI *uri = doc->GetDocumentURI(); if (!uri) { printf("Document doesn't have a URI.\n"); return; } nsCAutoString spec; uri->GetSpec(spec); printf("%s\n", spec.get()); } void PrintWinCodebase(nsGlobalWindow *win) { if (!win) { printf("No window passed in.\n"); return; } nsIPrincipal *prin = win->GetPrincipal(); if (!prin) { printf("Window doesn't have principals.\n"); return; } nsCOMPtr uri; prin->GetURI(getter_AddRefs(uri)); if (!uri) { printf("No URI, maybe the system principal.\n"); return; } nsCAutoString spec; uri->GetSpec(spec); printf("%s\n", spec.get()); } #endif static void MaybeGC(JSContext *cx) { size_t bytes = cx->runtime->gcBytes; size_t lastBytes = cx->runtime->gcLastBytes; if ((bytes > 8192 && bytes > lastBytes * 16) #ifdef DEBUG || cx->runtime->gcZeal > 0 #endif ) { JS_GC(cx); } } static already_AddRefed GetPromptFromContext(nsJSContext* ctx) { nsCOMPtr win(do_QueryInterface(ctx->GetGlobalObject())); NS_ENSURE_TRUE(win, nsnull); nsIDocShell *docShell = win->GetDocShell(); NS_ENSURE_TRUE(docShell, nsnull); nsCOMPtr ireq(do_QueryInterface(docShell)); NS_ENSURE_TRUE(ireq, nsnull); // Get the nsIPrompt interface from the docshell nsIPrompt* prompt; ireq->GetInterface(NS_GET_IID(nsIPrompt), (void**)&prompt); return prompt; } JSBool nsJSContext::DOMOperationCallback(JSContext *cx) { nsresult rv; // Get the native context nsJSContext *ctx = static_cast(::JS_GetContextPrivate(cx)); if (!ctx) { // Can happen; see bug 355811 return JS_TRUE; } // XXX Save the operation callback time so we can restore it after the GC, // because GCing can cause JS to run on our context, causing our // ScriptEvaluated to be called, and clearing our operation callback time. // See bug 302333. PRTime callbackTime = ctx->mOperationCallbackTime; PRTime modalStateTime = ctx->mModalStateTime; MaybeGC(cx); // Now restore the callback time and count, in case they got reset. ctx->mOperationCallbackTime = callbackTime; ctx->mModalStateTime = modalStateTime; // Check to see if we are running OOM nsCOMPtr mem; NS_GetMemoryManager(getter_AddRefs(mem)); if (!mem) { JS_ClearPendingException(cx); return JS_FALSE; } PRBool lowMemory; mem->IsLowMemory(&lowMemory); if (lowMemory) { // try to clean up: nsJSContext::CC(); // never prevent system scripts from running if (!::JS_IsSystemObject(cx, ::JS_GetGlobalObject(cx))) { // lets see if CC() did anything, if not, cancel the script. mem->IsLowMemory(&lowMemory); if (lowMemory) { if (nsContentUtils::GetBoolPref("dom.prevent_oom_dialog", PR_FALSE)) { JS_ClearPendingException(cx); return JS_FALSE; } nsCOMPtr prompt = GetPromptFromContext(ctx); nsXPIDLString title, msg; rv = nsContentUtils::GetLocalizedString(nsContentUtils::eDOM_PROPERTIES, "LowMemoryTitle", title); rv |= nsContentUtils::GetLocalizedString(nsContentUtils::eDOM_PROPERTIES, "LowMemoryMessage", msg); //GetStringFromName can return NS_OK and still give NULL string if (NS_FAILED(rv) || !title || !msg) { NS_ERROR("Failed to get localized strings."); JS_ClearPendingException(cx); return JS_FALSE; } prompt->Alert(title, msg); JS_ClearPendingException(cx); return JS_FALSE; } } } PRTime now = PR_Now(); if (callbackTime == 0) { // Initialize mOperationCallbackTime to start timing how long the // script has run ctx->mOperationCallbackTime = now; return JS_TRUE; } if (ctx->mModalStateDepth) { // We're waiting on a modal dialog, nothing more to do here. return JS_TRUE; } PRTime duration = now - callbackTime; // Check the amount of time this script has been running, or if the // dialog is disabled. PRBool isTrackingChromeCodeTime = ::JS_IsSystemObject(cx, ::JS_GetGlobalObject(cx)); if (duration < (isTrackingChromeCodeTime ? sMaxChromeScriptRunTime : sMaxScriptRunTime)) { return JS_TRUE; } // If we get here we're most likely executing an infinite loop in JS, // we'll tell the user about this and we'll give the user the option // of stopping the execution of the script. nsCOMPtr prompt = GetPromptFromContext(ctx); NS_ENSURE_TRUE(prompt, JS_TRUE); // Check if we should offer the option to debug JSStackFrame* fp = ::JS_GetScriptedCaller(cx, NULL); PRBool debugPossible = (fp != nsnull && cx->debugHooks && cx->debugHooks->debuggerHandler != nsnull); #ifdef MOZ_JSDEBUGGER // Get the debugger service if necessary. if (debugPossible) { PRBool jsds_IsOn = PR_FALSE; const char jsdServiceCtrID[] = "@mozilla.org/js/jsd/debugger-service;1"; nsCOMPtr jsdHook; nsCOMPtr jsds = do_GetService(jsdServiceCtrID, &rv); // Check if there's a user for the debugger service that's 'on' for us if (NS_SUCCEEDED(rv)) { jsds->GetDebuggerHook(getter_AddRefs(jsdHook)); jsds->GetIsOn(&jsds_IsOn); if (jsds_IsOn) { // If this is not true, the next call would start jsd... rv = jsds->OnForRuntime(cx->runtime); jsds_IsOn = NS_SUCCEEDED(rv); } } // If there is a debug handler registered for this runtime AND // ((jsd is on AND has a hook) OR (jsd isn't on (something else debugs))) // then something useful will be done with our request to debug. debugPossible = ((jsds_IsOn && (jsdHook != nsnull)) || !jsds_IsOn); } #endif // Get localizable strings nsXPIDLString title, msg, stopButton, waitButton, debugButton, neverShowDlg; rv = nsContentUtils::GetLocalizedString(nsContentUtils::eDOM_PROPERTIES, "KillScriptTitle", title); rv |= nsContentUtils::GetLocalizedString(nsContentUtils::eDOM_PROPERTIES, "StopScriptButton", stopButton); rv |= nsContentUtils::GetLocalizedString(nsContentUtils::eDOM_PROPERTIES, "WaitForScriptButton", waitButton); rv |= nsContentUtils::GetLocalizedString(nsContentUtils::eDOM_PROPERTIES, "DontAskAgain", neverShowDlg); if (debugPossible) { rv |= nsContentUtils::GetLocalizedString(nsContentUtils::eDOM_PROPERTIES, "DebugScriptButton", debugButton); rv |= nsContentUtils::GetLocalizedString(nsContentUtils::eDOM_PROPERTIES, "KillScriptWithDebugMessage", msg); } else { rv |= nsContentUtils::GetLocalizedString(nsContentUtils::eDOM_PROPERTIES, "KillScriptMessage", msg); } //GetStringFromName can return NS_OK and still give NULL string if (NS_FAILED(rv) || !title || !msg || !stopButton || !waitButton || (!debugButton && debugPossible) || !neverShowDlg) { NS_ERROR("Failed to get localized strings."); return JS_TRUE; } // Append file and line number information, if available JSScript *script = fp ? ::JS_GetFrameScript(cx, fp) : nsnull; if (script) { const char *filename = ::JS_GetScriptFilename(cx, script); if (filename) { nsXPIDLString scriptLocation; NS_ConvertUTF8toUTF16 filenameUTF16(filename); const PRUnichar *formatParams[] = { filenameUTF16.get() }; rv = nsContentUtils::FormatLocalizedString(nsContentUtils::eDOM_PROPERTIES, "KillScriptLocation", formatParams, 1, scriptLocation); if (NS_SUCCEEDED(rv) && scriptLocation) { msg.AppendLiteral("\n\n"); msg.Append(scriptLocation); JSStackFrame *fp, *iterator = nsnull; fp = ::JS_FrameIterator(cx, &iterator); if (fp) { jsbytecode *pc = ::JS_GetFramePC(cx, fp); if (pc) { PRUint32 lineno = ::JS_PCToLineNumber(cx, script, pc); msg.Append(':'); msg.AppendInt(lineno); } } } } } PRInt32 buttonPressed = 1; //In case user exits dialog by clicking X PRBool neverShowDlgChk = PR_FALSE; PRUint32 buttonFlags = (nsIPrompt::BUTTON_TITLE_IS_STRING * (nsIPrompt::BUTTON_POS_0 + nsIPrompt::BUTTON_POS_1)); // Add a third button if necessary: if (debugPossible) buttonFlags += nsIPrompt::BUTTON_TITLE_IS_STRING * nsIPrompt::BUTTON_POS_2; // Null out the operation callback while we're re-entering JS here. ::JS_SetOperationCallback(cx, nsnull); // Open the dialog. rv = prompt->ConfirmEx(title, msg, buttonFlags, stopButton, waitButton, debugButton, neverShowDlg, &neverShowDlgChk, &buttonPressed); ::JS_SetOperationCallback(cx, DOMOperationCallback); if (NS_FAILED(rv) || (buttonPressed == 1)) { // Allow the script to continue running if (neverShowDlgChk) { nsIPrefBranch *prefBranch = nsContentUtils::GetPrefBranch(); if (prefBranch) { prefBranch->SetIntPref(isTrackingChromeCodeTime ? "dom.max_chrome_script_run_time" : "dom.max_script_run_time", 0); } } ctx->mOperationCallbackTime = PR_Now(); return JS_TRUE; } else if ((buttonPressed == 2) && debugPossible) { // Debug the script jsval rval; switch(cx->debugHooks->debuggerHandler(cx, script, ::JS_GetFramePC(cx, fp), &rval, cx->debugHooks-> debuggerHandlerData)) { case JSTRAP_RETURN: fp->rval = rval; return JS_TRUE; case JSTRAP_ERROR: cx->throwing = JS_FALSE; return JS_FALSE; case JSTRAP_THROW: JS_SetPendingException(cx, rval); return JS_FALSE; case JSTRAP_CONTINUE: default: return JS_TRUE; } } JS_ClearPendingException(cx); return JS_FALSE; } void nsJSContext::EnterModalState() { if (!mModalStateDepth) { mModalStateTime = mOperationCallbackTime ? PR_Now() : 0; } ++mModalStateDepth; } void nsJSContext::LeaveModalState() { if (!mModalStateDepth) { NS_ERROR("Uh, mismatched LeaveModalState() call!"); return; } --mModalStateDepth; // If we're still in a modal dialog, or mOperationCallbackTime is still // uninitialized, do nothing. if (mModalStateDepth || !mOperationCallbackTime) { return; } // If mOperationCallbackTime was set when we entered the first dialog // (and mModalStateTime is thus non-zero), adjust mOperationCallbackTime // to account for time spent in the dialog. // If mOperationCallbackTime got set while the modal dialog was open, // simply set mOperationCallbackTime to the closing time of the dialog so // that we never adjust mOperationCallbackTime to be in the future. if (mModalStateTime) { mOperationCallbackTime += PR_Now() - mModalStateTime; } else { mOperationCallbackTime = PR_Now(); } } #define JS_OPTIONS_DOT_STR "javascript.options." static const char js_options_dot_str[] = JS_OPTIONS_DOT_STR; static const char js_strict_option_str[] = JS_OPTIONS_DOT_STR "strict"; static const char js_werror_option_str[] = JS_OPTIONS_DOT_STR "werror"; static const char js_relimit_option_str[]= JS_OPTIONS_DOT_STR "relimit"; #ifdef JS_GC_ZEAL static const char js_zeal_option_str[] = JS_OPTIONS_DOT_STR "gczeal"; #endif static const char js_jit_content_str[] = JS_OPTIONS_DOT_STR "jit.content"; static const char js_jit_chrome_str[] = JS_OPTIONS_DOT_STR "jit.chrome"; int nsJSContext::JSOptionChangedCallback(const char *pref, void *data) { nsJSContext *context = reinterpret_cast(data); PRUint32 oldDefaultJSOptions = context->mDefaultJSOptions; PRUint32 newDefaultJSOptions = oldDefaultJSOptions; PRBool strict = nsContentUtils::GetBoolPref(js_strict_option_str); if (strict) newDefaultJSOptions |= JSOPTION_STRICT; else newDefaultJSOptions &= ~JSOPTION_STRICT; nsIScriptGlobalObject *global = context->GetGlobalObject(); // XXX should we check for sysprin instead of a chrome window, to make // XXX components be covered by the chrome pref instead of the content one? nsCOMPtr chromeWindow(do_QueryInterface(global)); PRBool useJIT = nsContentUtils::GetBoolPref(chromeWindow ? js_jit_chrome_str : js_jit_content_str); nsCOMPtr xr = do_GetService(XULRUNTIME_SERVICE_CONTRACTID); if (xr) { PRBool safeMode = PR_FALSE; xr->GetInSafeMode(&safeMode); if (safeMode) useJIT = PR_FALSE; } if (useJIT) newDefaultJSOptions |= JSOPTION_JIT; else newDefaultJSOptions &= ~JSOPTION_JIT; #ifdef DEBUG // In debug builds, warnings are always enabled in chrome context // Note this callback is also called from context's InitClasses thus we don't // need to enable this directly from InitContext if ((newDefaultJSOptions & JSOPTION_STRICT) == 0) { if (chromeWindow) newDefaultJSOptions |= JSOPTION_STRICT; } #endif PRBool werror = nsContentUtils::GetBoolPref(js_werror_option_str); if (werror) newDefaultJSOptions |= JSOPTION_WERROR; else newDefaultJSOptions &= ~JSOPTION_WERROR; PRBool relimit = nsContentUtils::GetBoolPref(js_relimit_option_str); if (relimit) newDefaultJSOptions |= JSOPTION_RELIMIT; else newDefaultJSOptions &= ~JSOPTION_RELIMIT; if (newDefaultJSOptions != oldDefaultJSOptions) { // Set options only if we used the old defaults; otherwise the page has // customized some via the options object and we defer to its wisdom. if (::JS_GetOptions(context->mContext) == oldDefaultJSOptions) ::JS_SetOptions(context->mContext, newDefaultJSOptions); // Save the new defaults for the next page load (InitContext). context->mDefaultJSOptions = newDefaultJSOptions; } #ifdef JS_GC_ZEAL PRInt32 zeal = nsContentUtils::GetIntPref(js_zeal_option_str, -1); if (zeal >= 0) ::JS_SetGCZeal(context->mContext, (PRUint8)zeal); #endif return 0; } nsJSContext::nsJSContext(JSRuntime *aRuntime) : mGCOnDestruction(PR_TRUE) { ++sContextCount; mDefaultJSOptions = JSOPTION_PRIVATE_IS_NSISUPPORTS | JSOPTION_ANONFUNFIX; mContext = ::JS_NewContext(aRuntime, gStackSize); if (mContext) { ::JS_SetContextPrivate(mContext, static_cast(this)); // Make sure the new context gets the default context options ::JS_SetOptions(mContext, mDefaultJSOptions); // Watch for the JS boolean options nsContentUtils::RegisterPrefCallback(js_options_dot_str, JSOptionChangedCallback, this); ::JS_SetOperationCallback(mContext, DOMOperationCallback); static JSLocaleCallbacks localeCallbacks = { LocaleToUpperCase, LocaleToLowerCase, LocaleCompare, LocaleToUnicode }; ::JS_SetLocaleCallbacks(mContext, &localeCallbacks); } mIsInitialized = PR_FALSE; mNumEvaluations = 0; mTerminations = nsnull; mScriptsEnabled = PR_TRUE; mOperationCallbackTime = 0; mModalStateTime = 0; mModalStateDepth = 0; mProcessingScriptTag = PR_FALSE; } nsJSContext::~nsJSContext() { #ifdef DEBUG nsCycleCollector_DEBUG_wasFreed(static_cast(this)); #endif NS_PRECONDITION(!mTerminations, "Shouldn't have termination funcs by now"); mGlobalWrapperRef = nsnull; DestroyJSContext(); --sContextCount; if (!sContextCount && sDidShutdown) { // The last context is being deleted, and we're already in the // process of shutting down, release the JS runtime service, and // the security manager. NS_IF_RELEASE(sRuntimeService); NS_IF_RELEASE(sSecurityManager); NS_IF_RELEASE(gCollation); NS_IF_RELEASE(gDecoder); } } void nsJSContext::DestroyJSContext() { if (!mContext) return; // Clear our entry in the JSContext, bugzilla bug 66413 ::JS_SetContextPrivate(mContext, nsnull); // Unregister our "javascript.options.*" pref-changed callback. nsContentUtils::UnregisterPrefCallback(js_options_dot_str, JSOptionChangedCallback, this); PRBool do_gc = mGCOnDestruction && !sGCTimer && sReadyForGC; // Let xpconnect destroy the JSContext when it thinks the time is right. nsIXPConnect *xpc = nsContentUtils::XPConnect(); if (xpc) { xpc->ReleaseJSContext(mContext, !do_gc); } else if (do_gc) { ::JS_DestroyContext(mContext); } else { ::JS_DestroyContextNoGC(mContext); } mContext = nsnull; } // QueryInterface implementation for nsJSContext NS_IMPL_CYCLE_COLLECTION_CLASS(nsJSContext) NS_IMPL_CYCLE_COLLECTION_ROOT_BEGIN(nsJSContext) NS_ASSERTION(!tmp->mContext || tmp->mContext->outstandingRequests == 0, "Trying to unlink a context with outstanding requests."); tmp->mIsInitialized = PR_FALSE; tmp->mGCOnDestruction = PR_FALSE; tmp->DestroyJSContext(); NS_IMPL_CYCLE_COLLECTION_ROOT_END NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(nsJSContext) NS_IMPL_CYCLE_COLLECTION_TRACE_END NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsJSContext) NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mGlobalWrapperRef) NS_IMPL_CYCLE_COLLECTION_UNLINK_END NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_REFCNT(nsJSContext, tmp->GetCCRefcnt()) NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mGlobalWrapperRef) NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mContext"); nsContentUtils::XPConnect()->NoteJSContext(tmp->mContext, cb); NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsJSContext) NS_INTERFACE_MAP_ENTRY(nsIScriptContext) NS_INTERFACE_MAP_ENTRY(nsIXPCScriptNotify) NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIScriptContext) NS_INTERFACE_MAP_END NS_IMPL_CYCLE_COLLECTING_ADDREF_AMBIGUOUS(nsJSContext, nsIScriptContext) NS_IMPL_CYCLE_COLLECTING_RELEASE_AMBIGUOUS(nsJSContext, nsIScriptContext) nsrefcnt nsJSContext::GetCCRefcnt() { nsrefcnt refcnt = mRefCnt.get(); if (NS_LIKELY(mContext)) refcnt += mContext->outstandingRequests; return refcnt; } nsresult nsJSContext::EvaluateStringWithValue(const nsAString& aScript, void *aScopeObject, nsIPrincipal *aPrincipal, const char *aURL, PRUint32 aLineNo, PRUint32 aVersion, void* aRetValue, PRBool* aIsUndefined) { NS_ENSURE_TRUE(mIsInitialized, NS_ERROR_NOT_INITIALIZED); if (!mScriptsEnabled) { if (aIsUndefined) { *aIsUndefined = PR_TRUE; } return NS_OK; } nsresult rv; if (!aScopeObject) aScopeObject = ::JS_GetGlobalObject(mContext); // Safety first: get an object representing the script's principals, i.e., // the entities who signed this script, or the fully-qualified-domain-name // or "codebase" from which it was loaded. JSPrincipals *jsprin; nsIPrincipal *principal = aPrincipal; if (!aPrincipal) { nsIScriptGlobalObject *global = GetGlobalObject(); if (!global) return NS_ERROR_FAILURE; nsCOMPtr objPrincipal = do_QueryInterface(global, &rv); if (NS_FAILED(rv)) return NS_ERROR_FAILURE; principal = objPrincipal->GetPrincipal(); if (!principal) return NS_ERROR_FAILURE; } principal->GetJSPrincipals(mContext, &jsprin); // From here on, we must JSPRINCIPALS_DROP(jsprin) before returning... PRBool ok = PR_FALSE; rv = sSecurityManager->CanExecuteScripts(mContext, principal, &ok); if (NS_FAILED(rv)) { JSPRINCIPALS_DROP(mContext, jsprin); return NS_ERROR_FAILURE; } // Push our JSContext on the current thread's context stack so JS called // from native code via XPConnect uses the right context. Do this whether // or not the SecurityManager said "ok", in order to simplify control flow // below where we pop before returning. nsCOMPtr stack = do_GetService("@mozilla.org/js/xpc/ContextStack;1", &rv); if (NS_FAILED(rv) || NS_FAILED(stack->Push(mContext))) { JSPRINCIPALS_DROP(mContext, jsprin); return NS_ERROR_FAILURE; } jsval val; nsJSContext::TerminationFuncHolder holder(this); // SecurityManager said "ok", but don't compile if aVersion is unknown. // Since the caller is responsible for parsing the version strings, we just // check it isn't JSVERSION_UNKNOWN. if (ok && ((JSVersion)aVersion) != JSVERSION_UNKNOWN) { JSAutoRequest ar(mContext); nsJSVersionSetter setVersion(mContext, aVersion); ok = ::JS_EvaluateUCScriptForPrincipals(mContext, (JSObject *)aScopeObject, jsprin, (jschar*)PromiseFlatString(aScript).get(), aScript.Length(), aURL, aLineNo, &val); if (!ok) { // Tell XPConnect about any pending exceptions. This is needed // to avoid dropping JS exceptions in case we got here through // nested calls through XPConnect. ReportPendingException(); } } // Whew! Finally done with these manually ref-counted things. JSPRINCIPALS_DROP(mContext, jsprin); // If all went well, convert val to a string (XXXbe unless undefined?). if (ok) { if (aIsUndefined) { *aIsUndefined = JSVAL_IS_VOID(val); } *static_cast(aRetValue) = val; // XXX - nsScriptObjectHolder should be used once this method moves to // the new world order. However, use of 'jsval' appears to make this // tricky... } else { if (aIsUndefined) { *aIsUndefined = PR_TRUE; } } // Pop here, after JS_ValueToString and any other possible evaluation. if (NS_FAILED(stack->Pop(nsnull))) rv = NS_ERROR_FAILURE; // ScriptEvaluated needs to come after we pop the stack ScriptEvaluated(PR_TRUE); return rv; } // Helper function to convert a jsval to an nsAString, and set // exception flags if the conversion fails. static nsresult JSValueToAString(JSContext *cx, jsval val, nsAString *result, PRBool *isUndefined) { if (isUndefined) { *isUndefined = JSVAL_IS_VOID(val); } if (!result) { return NS_OK; } JSString* jsstring = ::JS_ValueToString(cx, val); if (jsstring) { result->Assign(reinterpret_cast (::JS_GetStringChars(jsstring)), ::JS_GetStringLength(jsstring)); } else { result->Truncate(); // We failed to convert val to a string. We're either OOM, or the // security manager denied access to .toString(), or somesuch, on // an object. Treat this case as if the result were undefined. if (isUndefined) { *isUndefined = PR_TRUE; } if (!::JS_IsExceptionPending(cx)) { // JS_ValueToString() returned null w/o an exception // pending. That means we're OOM. return NS_ERROR_OUT_OF_MEMORY; } } return NS_OK; } nsresult nsJSContext::EvaluateString(const nsAString& aScript, void *aScopeObject, nsIPrincipal *aPrincipal, const char *aURL, PRUint32 aLineNo, PRUint32 aVersion, nsAString *aRetValue, PRBool* aIsUndefined) { NS_ENSURE_TRUE(mIsInitialized, NS_ERROR_NOT_INITIALIZED); if (!mScriptsEnabled) { if (aIsUndefined) { *aIsUndefined = PR_TRUE; } if (aRetValue) { aRetValue->Truncate(); } return NS_OK; } nsresult rv; if (!aScopeObject) aScopeObject = ::JS_GetGlobalObject(mContext); // Safety first: get an object representing the script's principals, i.e., // the entities who signed this script, or the fully-qualified-domain-name // or "codebase" from which it was loaded. JSPrincipals *jsprin; nsIPrincipal *principal = aPrincipal; if (aPrincipal) { aPrincipal->GetJSPrincipals(mContext, &jsprin); } else { nsCOMPtr objPrincipal = do_QueryInterface(GetGlobalObject(), &rv); if (NS_FAILED(rv)) return NS_ERROR_FAILURE; principal = objPrincipal->GetPrincipal(); if (!principal) return NS_ERROR_FAILURE; principal->GetJSPrincipals(mContext, &jsprin); } // From here on, we must JSPRINCIPALS_DROP(jsprin) before returning... PRBool ok = PR_FALSE; rv = sSecurityManager->CanExecuteScripts(mContext, principal, &ok); if (NS_FAILED(rv)) { JSPRINCIPALS_DROP(mContext, jsprin); return NS_ERROR_FAILURE; } // Push our JSContext on the current thread's context stack so JS called // from native code via XPConnect uses the right context. Do this whether // or not the SecurityManager said "ok", in order to simplify control flow // below where we pop before returning. nsCOMPtr stack = do_GetService("@mozilla.org/js/xpc/ContextStack;1", &rv); if (NS_FAILED(rv) || NS_FAILED(stack->Push(mContext))) { JSPRINCIPALS_DROP(mContext, jsprin); return NS_ERROR_FAILURE; } // The result of evaluation, used only if there were no errors. This need // not be a GC root currently, provided we run the GC only from the // operation callback or from ScriptEvaluated. jsval val = JSVAL_VOID; jsval* vp = aRetValue ? &val : NULL; nsJSContext::TerminationFuncHolder holder(this); // SecurityManager said "ok", but don't compile if aVersion is unknown. // Since the caller is responsible for parsing the version strings, we just // check it isn't JSVERSION_UNKNOWN. if (ok && ((JSVersion)aVersion) != JSVERSION_UNKNOWN) { JSAutoRequest ar(mContext); nsJSVersionSetter setVersion(mContext, aVersion); ok = ::JS_EvaluateUCScriptForPrincipals(mContext, (JSObject *)aScopeObject, jsprin, (jschar*)PromiseFlatString(aScript).get(), aScript.Length(), aURL, aLineNo, vp); if (!ok) { // Tell XPConnect about any pending exceptions. This is needed // to avoid dropping JS exceptions in case we got here through // nested calls through XPConnect. ReportPendingException(); } } // Whew! Finally done with these manually ref-counted things. JSPRINCIPALS_DROP(mContext, jsprin); // If all went well, convert val to a string if one is wanted. if (ok) { JSAutoRequest ar(mContext); rv = JSValueToAString(mContext, val, aRetValue, aIsUndefined); } else { if (aIsUndefined) { *aIsUndefined = PR_TRUE; } if (aRetValue) { aRetValue->Truncate(); } } // Pop here, after JS_ValueToString and any other possible evaluation. if (NS_FAILED(stack->Pop(nsnull))) rv = NS_ERROR_FAILURE; // ScriptEvaluated needs to come after we pop the stack ScriptEvaluated(PR_TRUE); return rv; } nsresult nsJSContext::CompileScript(const PRUnichar* aText, PRInt32 aTextLength, void *aScopeObject, nsIPrincipal *aPrincipal, const char *aURL, PRUint32 aLineNo, PRUint32 aVersion, nsScriptObjectHolder &aScriptObject) { NS_ENSURE_TRUE(mIsInitialized, NS_ERROR_NOT_INITIALIZED); nsresult rv; NS_ENSURE_ARG_POINTER(aPrincipal); if (!aScopeObject) aScopeObject = ::JS_GetGlobalObject(mContext); JSPrincipals *jsprin; aPrincipal->GetJSPrincipals(mContext, &jsprin); // From here on, we must JSPRINCIPALS_DROP(jsprin) before returning... PRBool ok = PR_FALSE; rv = sSecurityManager->CanExecuteScripts(mContext, aPrincipal, &ok); if (NS_FAILED(rv)) { JSPRINCIPALS_DROP(mContext, jsprin); return NS_ERROR_FAILURE; } aScriptObject.drop(); // ensure old object not used on failure... // SecurityManager said "ok", but don't compile if aVersion is unknown. // Since the caller is responsible for parsing the version strings, we just // check it isn't JSVERSION_UNKNOWN. if (ok && ((JSVersion)aVersion) != JSVERSION_UNKNOWN) { JSAutoRequest ar(mContext); nsJSVersionSetter setVersion(mContext, aVersion); JSScript* script = ::JS_CompileUCScriptForPrincipals(mContext, (JSObject *)aScopeObject, jsprin, (jschar*) aText, aTextLength, aURL, aLineNo); if (script) { JSObject *scriptObject = ::JS_NewScriptObject(mContext, script); if (scriptObject) { NS_ASSERTION(aScriptObject.getScriptTypeID()==JAVASCRIPT, "Expecting JS script object holder"); rv = aScriptObject.set(scriptObject); } else { ::JS_DestroyScript(mContext, script); script = nsnull; } } else { rv = NS_ERROR_OUT_OF_MEMORY; } } // Whew! Finally done. JSPRINCIPALS_DROP(mContext, jsprin); return rv; } nsresult nsJSContext::ExecuteScript(void *aScriptObject, void *aScopeObject, nsAString* aRetValue, PRBool* aIsUndefined) { NS_ENSURE_TRUE(mIsInitialized, NS_ERROR_NOT_INITIALIZED); if (!mScriptsEnabled) { if (aIsUndefined) { *aIsUndefined = PR_TRUE; } if (aRetValue) { aRetValue->Truncate(); } return NS_OK; } nsresult rv; if (!aScopeObject) aScopeObject = ::JS_GetGlobalObject(mContext); // Push our JSContext on our thread's context stack, in case native code // called from JS calls back into JS via XPConnect. nsCOMPtr stack = do_GetService("@mozilla.org/js/xpc/ContextStack;1", &rv); if (NS_FAILED(rv) || NS_FAILED(stack->Push(mContext))) { return NS_ERROR_FAILURE; } // The result of evaluation, used only if there were no errors. This need // not be a GC root currently, provided we run the GC only from the // operation callback or from ScriptEvaluated. jsval val; JSBool ok; nsJSContext::TerminationFuncHolder holder(this); JSAutoRequest ar(mContext); ok = ::JS_ExecuteScript(mContext, (JSObject *)aScopeObject, (JSScript*)::JS_GetPrivate(mContext, (JSObject*)aScriptObject), &val); if (ok) { // If all went well, convert val to a string (XXXbe unless undefined?). rv = JSValueToAString(mContext, val, aRetValue, aIsUndefined); } else { if (aIsUndefined) { *aIsUndefined = PR_TRUE; } if (aRetValue) { aRetValue->Truncate(); } } // Pop here, after JS_ValueToString and any other possible evaluation. if (NS_FAILED(stack->Pop(nsnull))) rv = NS_ERROR_FAILURE; // ScriptEvaluated needs to come after we pop the stack ScriptEvaluated(PR_TRUE); return rv; } static inline const char * AtomToEventHandlerName(nsIAtom *aName) { const char *name; aName->GetUTF8String(&name); #ifdef DEBUG const char *cp; char c; for (cp = name; *cp != '\0'; ++cp) { c = *cp; NS_ASSERTION (('A' <= c && c <= 'Z') || ('a' <= c && c <= 'z'), "non-ASCII non-alphabetic event handler name"); } #endif return name; } // Helper function to find the JSObject associated with a (presumably DOM) // interface. nsresult nsJSContext::JSObjectFromInterface(nsISupports* aTarget, void *aScope, JSObject **aRet) { // It is legal to specify a null target. if (!aTarget) { *aRet = nsnull; return NS_OK; } // Get the jsobject associated with this target // We don't wrap here because we trust the JS engine to wrap the target // later. nsresult rv; jsval v; rv = nsContentUtils::XPConnect()->WrapNativeToJSVal(mContext, (JSObject *)aScope, aTarget, &NS_GET_IID(nsISupports), PR_FALSE, &v, nsnull); NS_ENSURE_SUCCESS(rv, rv); #ifdef NS_DEBUG nsCOMPtr targetSupp = do_QueryInterface(aTarget); nsCOMPtr native = nsContentUtils::XPConnect()->GetNativeOfWrapper(mContext, JSVAL_TO_OBJECT(v)); NS_ASSERTION(native == targetSupp, "Native should be the target!"); #endif *aRet = JSVAL_TO_OBJECT(v); return NS_OK; } nsresult nsJSContext::CompileEventHandler(nsIAtom *aName, PRUint32 aArgCount, const char** aArgNames, const nsAString& aBody, const char *aURL, PRUint32 aLineNo, PRUint32 aVersion, nsScriptObjectHolder &aHandler) { NS_ENSURE_TRUE(mIsInitialized, NS_ERROR_NOT_INITIALIZED); NS_PRECONDITION(!::JS_IsExceptionPending(mContext), "Why are we being called with a pending exception?"); if (!sSecurityManager) { NS_ERROR("Huh, we need a script security manager to compile " "an event handler!"); return NS_ERROR_UNEXPECTED; } // Don't compile if aVersion is unknown. Since the caller is responsible for // parsing the version strings, we just check it isn't JSVERSION_UNKNOWN. if ((JSVersion)aVersion == JSVERSION_UNKNOWN) { return NS_ERROR_ILLEGAL_VALUE; } const char *charName = AtomToEventHandlerName(aName); #ifdef DEBUG JSContext* top = nsContentUtils::GetCurrentJSContext(); NS_ASSERTION(mContext == top, "Context not properly pushed!"); #endif // Event handlers are always shared, and must be bound before use. // Therefore we never bother compiling with principals. // (that probably means we should avoid JS_CompileUCFunctionForPrincipals!) JSAutoRequest ar(mContext); nsJSVersionSetter setVersion(mContext, aVersion); JSFunction* fun = ::JS_CompileUCFunctionForPrincipals(mContext, nsnull, nsnull, charName, aArgCount, aArgNames, (jschar*)PromiseFlatString(aBody).get(), aBody.Length(), aURL, aLineNo); if (!fun) { ReportPendingException(); return NS_ERROR_ILLEGAL_VALUE; } JSObject *handler = ::JS_GetFunctionObject(fun); NS_ASSERTION(aHandler.getScriptTypeID()==JAVASCRIPT, "Expecting JS script object holder"); return aHandler.set((void *)handler); } // XXX - note that CompileFunction doesn't yet play the nsScriptObjectHolder // game - caller must still ensure JS GC root. nsresult nsJSContext::CompileFunction(void* aTarget, const nsACString& aName, PRUint32 aArgCount, const char** aArgArray, const nsAString& aBody, const char* aURL, PRUint32 aLineNo, PRUint32 aVersion, PRBool aShared, void** aFunctionObject) { NS_ENSURE_TRUE(mIsInitialized, NS_ERROR_NOT_INITIALIZED); // Don't compile if aVersion is unknown. Since the caller is responsible for // parsing the version strings, we just check it isn't JSVERSION_UNKNOWN. if ((JSVersion)aVersion == JSVERSION_UNKNOWN) { return NS_ERROR_ILLEGAL_VALUE; } JSPrincipals *jsprin = nsnull; nsIScriptGlobalObject *global = GetGlobalObject(); if (global) { // XXXbe why the two-step QI? speed up via a new GetGlobalObjectData func? nsCOMPtr globalData = do_QueryInterface(global); if (globalData) { nsIPrincipal *prin = globalData->GetPrincipal(); if (!prin) return NS_ERROR_FAILURE; prin->GetJSPrincipals(mContext, &jsprin); } } JSObject *target = (JSObject*)aTarget; JSAutoRequest ar(mContext); nsJSVersionSetter setVersion(mContext, aVersion); JSFunction* fun = ::JS_CompileUCFunctionForPrincipals(mContext, aShared ? nsnull : target, jsprin, PromiseFlatCString(aName).get(), aArgCount, aArgArray, (jschar*)PromiseFlatString(aBody).get(), aBody.Length(), aURL, aLineNo); if (jsprin) JSPRINCIPALS_DROP(mContext, jsprin); if (!fun) return NS_ERROR_FAILURE; JSObject *handler = ::JS_GetFunctionObject(fun); if (aFunctionObject) *aFunctionObject = (void*) handler; return NS_OK; } nsresult nsJSContext::CallEventHandler(nsISupports* aTarget, void *aScope, void *aHandler, nsIArray *aargv, nsIVariant **arv) { NS_ENSURE_TRUE(mIsInitialized, NS_ERROR_NOT_INITIALIZED); if (!mScriptsEnabled) { return NS_OK; } jsval targetVal = JSVAL_VOID; JSAutoTempValueRooter tvr(mContext, 1, &targetVal); JSObject* target = nsnull; nsresult rv = JSObjectFromInterface(aTarget, aScope, &target); NS_ENSURE_SUCCESS(rv, rv); targetVal = OBJECT_TO_JSVAL(target); jsval rval = JSVAL_VOID; // This one's a lot easier than EvaluateString because we don't have to // hassle with principals: they're already compiled into the JS function. // xxxmarkh - this comment is no longer true - principals are not used at // all now, and never were in some cases. nsCOMPtr stack = do_GetService("@mozilla.org/js/xpc/ContextStack;1", &rv); if (NS_FAILED(rv) || NS_FAILED(stack->Push(mContext))) return NS_ERROR_FAILURE; // check if the event handler can be run on the object in question rv = sSecurityManager->CheckFunctionAccess(mContext, aHandler, target); nsJSContext::TerminationFuncHolder holder(this); if (NS_SUCCEEDED(rv)) { // Convert args to jsvals. void *mark; PRUint32 argc = 0; jsval *argv = nsnull; // Use |target| as the scope for wrapping the arguments, since aScope is // the safe scope in many cases, which isn't very useful. Wrapping aTarget // was OK because those typically have PreCreate methods that give them the // right scope anyway, and we want to make sure that the arguments end up // in the same scope as aTarget. rv = ConvertSupportsTojsvals(aargv, target, &argc, reinterpret_cast(&argv), &mark); if (NS_FAILED(rv)) { stack->Pop(nsnull); return rv; } AutoFreeJSStack stackGuard(mContext, mark); // ensure always freed. jsval funval = OBJECT_TO_JSVAL(static_cast(aHandler)); JSAutoRequest ar(mContext); PRBool ok = ::JS_CallFunctionValue(mContext, target, funval, argc, argv, &rval); if (!ok) { // Tell XPConnect about any pending exceptions. This is needed // to avoid dropping JS exceptions in case we got here through // nested calls through XPConnect. ReportPendingException(); // Don't pass back results from failed calls. rval = JSVAL_VOID; // Tell the caller that the handler threw an error. rv = NS_ERROR_FAILURE; } } if (NS_FAILED(stack->Pop(nsnull))) return NS_ERROR_FAILURE; // Convert to variant before calling ScriptEvaluated, as it may GC, meaning // we would need to root rval. JSAutoRequest ar(mContext); if (NS_SUCCEEDED(rv)) { if (rval == JSVAL_NULL) *arv = nsnull; else rv = nsContentUtils::XPConnect()->JSToVariant(mContext, rval, arv); } // ScriptEvaluated needs to come after we pop the stack ScriptEvaluated(PR_TRUE); return rv; } nsresult nsJSContext::BindCompiledEventHandler(nsISupports* aTarget, void *aScope, nsIAtom *aName, void *aHandler) { NS_ENSURE_ARG(aHandler); NS_ENSURE_TRUE(mIsInitialized, NS_ERROR_NOT_INITIALIZED); const char *charName = AtomToEventHandlerName(aName); nsresult rv; // Get the jsobject associated with this target JSObject *target = nsnull; nsAutoGCRoot root(&target, &rv); NS_ENSURE_SUCCESS(rv, rv); rv = JSObjectFromInterface(aTarget, aScope, &target); NS_ENSURE_SUCCESS(rv, rv); JSObject *funobj = (JSObject*) aHandler; JSAutoRequest ar(mContext); NS_ASSERTION(JS_TypeOfValue(mContext, OBJECT_TO_JSVAL(funobj)) == JSTYPE_FUNCTION, "Event handler object not a function"); // Push our JSContext on our thread's context stack, in case native code // called from JS calls back into JS via XPConnect. nsCOMPtr stack = do_GetService("@mozilla.org/js/xpc/ContextStack;1", &rv); if (NS_FAILED(rv) || NS_FAILED(stack->Push(mContext))) { return NS_ERROR_FAILURE; } // Make sure the handler function is parented by its event target object if (funobj) { // && ::JS_GetParent(mContext, funobj) != target) { funobj = ::JS_CloneFunctionObject(mContext, funobj, target); if (!funobj) rv = NS_ERROR_OUT_OF_MEMORY; } if (NS_SUCCEEDED(rv) && // Make sure the flags here match those in nsEventReceiverSH::NewResolve !::JS_DefineProperty(mContext, target, charName, OBJECT_TO_JSVAL(funobj), nsnull, nsnull, JSPROP_ENUMERATE | JSPROP_PERMANENT)) { ReportPendingException(); rv = NS_ERROR_FAILURE; } // XXXmarkh - ideally we should assert that the wrapped native is now // "long lived" - how to do that? if (NS_FAILED(stack->Pop(nsnull)) && NS_SUCCEEDED(rv)) { rv = NS_ERROR_FAILURE; } return rv; } nsresult nsJSContext::GetBoundEventHandler(nsISupports* aTarget, void *aScope, nsIAtom* aName, nsScriptObjectHolder &aHandler) { nsresult rv; JSObject *obj = nsnull; nsAutoGCRoot root(&obj, &rv); NS_ENSURE_SUCCESS(rv, rv); JSAutoRequest ar(mContext); rv = JSObjectFromInterface(aTarget, aScope, &obj); NS_ENSURE_SUCCESS(rv, rv); const char *charName = AtomToEventHandlerName(aName); jsval funval; if (!JS_LookupProperty(mContext, obj, charName, &funval)) return NS_ERROR_FAILURE; if (JS_TypeOfValue(mContext, funval) != JSTYPE_FUNCTION) { NS_WARNING("Event handler object not a function"); aHandler.drop(); return NS_OK; } NS_ASSERTION(aHandler.getScriptTypeID()==JAVASCRIPT, "Expecting JS script object holder"); return aHandler.set(JSVAL_TO_OBJECT(funval)); } // serialization nsresult nsJSContext::Serialize(nsIObjectOutputStream* aStream, void *aScriptObject) { JSObject *mJSObject = (JSObject *)aScriptObject; if (!mJSObject) return NS_ERROR_FAILURE; nsresult rv; JSContext* cx = mContext; JSXDRState *xdr = ::JS_XDRNewMem(cx, JSXDR_ENCODE); if (! xdr) return NS_ERROR_OUT_OF_MEMORY; xdr->userdata = (void*) aStream; JSAutoRequest ar(cx); JSScript *script = reinterpret_cast (::JS_GetPrivate(cx, mJSObject)); if (! ::JS_XDRScript(xdr, &script)) { rv = NS_ERROR_FAILURE; // likely to be a principals serialization error } else { // Get the encoded JSXDRState data and write it. The JSXDRState owns // this buffer memory and will free it beneath ::JS_XDRDestroy. // // If an XPCOM object needs to be written in the midst of the JS XDR // encoding process, the C++ code called back from the JS engine (e.g., // nsEncodeJSPrincipals in caps/src/nsJSPrincipals.cpp) will flush data // from the JSXDRState to aStream, then write the object, then return // to JS XDR code with xdr reset so new JS data is encoded at the front // of the xdr's data buffer. // // However many XPCOM objects are interleaved with JS XDR data in the // stream, when control returns here from ::JS_XDRScript, we'll have // one last buffer of data to write to aStream. uint32 size; const char* data = reinterpret_cast (::JS_XDRMemGetData(xdr, &size)); NS_ASSERTION(data, "no decoded JSXDRState data!"); rv = aStream->Write32(size); if (NS_SUCCEEDED(rv)) rv = aStream->WriteBytes(data, size); } ::JS_XDRDestroy(xdr); if (NS_FAILED(rv)) return rv; return rv; } nsresult nsJSContext::Deserialize(nsIObjectInputStream* aStream, nsScriptObjectHolder &aResult) { JSObject *result = nsnull; nsresult rv; NS_TIMELINE_MARK_FUNCTION("js script deserialize"); PRUint32 size; rv = aStream->Read32(&size); if (NS_FAILED(rv)) return rv; char* data; rv = aStream->ReadBytes(size, &data); if (NS_FAILED(rv)) return rv; JSContext* cx = mContext; JSXDRState *xdr = ::JS_XDRNewMem(cx, JSXDR_DECODE); if (! xdr) { rv = NS_ERROR_OUT_OF_MEMORY; } else { xdr->userdata = (void*) aStream; JSAutoRequest ar(cx); ::JS_XDRMemSetData(xdr, data, size); JSScript *script = nsnull; if (! ::JS_XDRScript(xdr, &script)) { rv = NS_ERROR_FAILURE; // principals deserialization error? } else { result = ::JS_NewScriptObject(cx, script); if (! result) { rv = NS_ERROR_OUT_OF_MEMORY; // certain error ::JS_DestroyScript(cx, script); } } // Update data in case ::JS_XDRScript called back into C++ code to // read an XPCOM object. // // In that case, the serialization process must have flushed a run // of counted bytes containing JS data at the point where the XPCOM // object starts, after which an encoding C++ callback from the JS // XDR code must have written the XPCOM object directly into the // nsIObjectOutputStream. // // The deserialization process will XDR-decode counted bytes up to // but not including the XPCOM object, then call back into C++ to // read the object, then read more counted bytes and hand them off // to the JSXDRState, so more JS data can be decoded. // // This interleaving of JS XDR data and XPCOM object data may occur // several times beneath the call to ::JS_XDRScript, above. At the // end of the day, we need to free (via nsMemory) the data owned by // the JSXDRState. So we steal it back, nulling xdr's buffer so it // doesn't get passed to ::JS_free by ::JS_XDRDestroy. uint32 junk; data = (char*) ::JS_XDRMemGetData(xdr, &junk); if (data) ::JS_XDRMemSetData(xdr, NULL, 0); ::JS_XDRDestroy(xdr); } // If data is null now, it must have been freed while deserializing an // XPCOM object (e.g., a principal) beneath ::JS_XDRScript. if (data) nsMemory::Free(data); NS_ASSERTION(aResult.getScriptTypeID()==JAVASCRIPT, "Expecting JS script object holder"); // Now that we've cleaned up, handle the case when rv is a failure // code, which could happen for all sorts of reasons above. NS_ENSURE_SUCCESS(rv, rv); return aResult.set(result); } void nsJSContext::SetDefaultLanguageVersion(PRUint32 aVersion) { ::JS_SetVersion(mContext, (JSVersion)aVersion); } nsIScriptGlobalObject * nsJSContext::GetGlobalObject() { JSObject *global = ::JS_GetGlobalObject(mContext); if (!global) { NS_WARNING("Context has no global."); return nsnull; } JSClass *c = JS_GET_CLASS(mContext, global); if (!c || ((~c->flags) & (JSCLASS_HAS_PRIVATE | JSCLASS_PRIVATE_IS_NSISUPPORTS))) { return nsnull; } nsCOMPtr sgo; nsISupports *priv = (nsISupports *)::JS_GetPrivate(mContext, global); nsCOMPtr wrapped_native = do_QueryInterface(priv); if (wrapped_native) { // The global object is a XPConnect wrapped native, the native in // the wrapper might be the nsIScriptGlobalObject sgo = do_QueryWrappedNative(wrapped_native); } else { sgo = do_QueryInterface(priv); } // This'll return a pointer to something we're about to release, but // that's ok, the JS object will hold it alive long enough. return sgo; } void * nsJSContext::GetNativeGlobal() { return ::JS_GetGlobalObject(mContext); } nsresult nsJSContext::CreateNativeGlobalForInner( nsIScriptGlobalObject *aNewInner, PRBool aIsChrome, void **aNativeGlobal, nsISupports **aHolder) { nsIXPConnect *xpc = nsContentUtils::XPConnect(); PRUint32 flags = aIsChrome? nsIXPConnect::FLAG_SYSTEM_GLOBAL_OBJECT : 0; nsCOMPtr jsholder; nsresult rv = xpc-> InitClassesWithNewWrappedGlobal(mContext, aNewInner, NS_GET_IID(nsISupports), flags, getter_AddRefs(jsholder)); if (NS_FAILED(rv)) return rv; jsholder->GetJSObject(reinterpret_cast(aNativeGlobal)); *aHolder = jsholder.get(); NS_ADDREF(*aHolder); return NS_OK; } nsresult nsJSContext::ConnectToInner(nsIScriptGlobalObject *aNewInner, void *aOuterGlobal) { NS_ENSURE_ARG(aNewInner); JSObject *newInnerJSObject = (JSObject *)aNewInner->GetScriptGlobal(JAVASCRIPT); JSObject *myobject = (JSObject *)aOuterGlobal; // Make the inner and outer window both share the same // prototype. The prototype we share is the outer window's // prototype, this way XPConnect can still find the wrapper to // use when making a call like alert() (w/o qualifying it with // "window."). XPConnect looks up the wrapper based on the // function object's parent, which is the object the function // was called on, and when calling alert() we'll be calling the // alert() function from the outer window's prototype off of the // inner window. In this case XPConnect is able to find the // outer (through the JSExtendedClass hook outerObject), so this // prototype sharing works. // We do *not* want to use anything else out of the outer // object's prototype chain than the first prototype, which is // the XPConnect prototype. The rest we want from the inner // window's prototype, i.e. the global scope polluter and // Object.prototype. This way the outer also gets the benefits // of the global scope polluter, and the inner window's // Object.prototype. JSObject *proto = ::JS_GetPrototype(mContext, myobject); JSObject *innerProto = ::JS_GetPrototype(mContext, newInnerJSObject); JSObject *innerProtoProto = ::JS_GetPrototype(mContext, innerProto); ::JS_SetPrototype(mContext, newInnerJSObject, proto); ::JS_SetPrototype(mContext, proto, innerProtoProto); return NS_OK; } void * nsJSContext::GetNativeContext() { return mContext; } nsresult nsJSContext::InitContext(nsIScriptGlobalObject *aGlobalObject) { // Make sure callers of this use // WillInitializeContext/DidInitializeContext around this call. NS_ENSURE_TRUE(!mIsInitialized, NS_ERROR_ALREADY_INITIALIZED); if (!mContext) return NS_ERROR_OUT_OF_MEMORY; ::JS_SetErrorReporter(mContext, NS_ScriptErrorReporter); if (!aGlobalObject) { // If we don't get a global object then there's nothing more to do here. return NS_OK; } nsCxPusher cxPusher; if (!cxPusher.Push(mContext)) { return NS_ERROR_FAILURE; } nsIXPConnect *xpc = nsContentUtils::XPConnect(); JSObject *global = ::JS_GetGlobalObject(mContext); nsCOMPtr holder; // If there's already a global object in mContext we won't tell // XPConnect to wrap aGlobalObject since it's already wrapped. nsresult rv; if (!global) { nsCOMPtr chromeWindow(do_QueryInterface(aGlobalObject)); PRUint32 flags = 0; if (chromeWindow) { // Flag this window's global object and objects under it as "system", // for optional automated XPCNativeWrapper construction when chrome JS // views a content DOM. flags = nsIXPConnect::FLAG_SYSTEM_GLOBAL_OBJECT; // Always enable E4X for XUL and other chrome content -- there is no // need to preserve the