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gecko-dev/dom/base/nsJSEnvironment.cpp

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/* -*- 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 <mhammond@skippinet.com.au>
*
* 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 "jscntxt.h"
#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 "nsEventDispatcher.h"
#include "nsIContent.h"
#include "nsCycleCollector.h"
#include "nsNetUtil.h"
#include "nsXPCOMCIDInternal.h"
#include "nsIXULRuntime.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"
#include "WrapperFactory.h"
#include "nsGlobalWindow.h"
#ifdef XP_MACOSX
// AssertMacros.h defines 'check' and conflicts with AccessCheck.h
#undef check
#endif
#include "AccessCheck.h"
#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"
#include "mozilla/FunctionTimer.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;
// 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<nsIObserverService> obs = mozilla::services::GetObserverService();
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(nsnull);
return NS_OK;
}
/****************************************************************
************************** AutoFree ****************************
****************************************************************/
class AutoFree {
public:
AutoFree(void *aPtr) : mPtr(aPtr) {
}
~AutoFree() {
if (mPtr)
nsMemory::Free(mPtr);
}
void Invalidate() {
mPtr = 0;
}
private:
void *mPtr;
};
class nsAutoPoolRelease {
public:
nsAutoPoolRelease(JSArenaPool *p, void *m) : mPool(p), mMark(m) {}
~nsAutoPoolRelease() { JS_ARENA_RELEASE(mPool, mMark); }
private:
JSArenaPool *mPool;
void *mMark;
};
// 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<nsPIDOMWindow> win(do_QueryInterface(aScriptGlobal));
nsIDocShell *docShell = win ? win->GetDocShell() : nsnull;
if (docShell) {
nsRefPtr<nsPresContext> 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;
}
class ScriptErrorEvent : public nsRunnable
{
public:
ScriptErrorEvent(nsIScriptGlobalObject* aScriptGlobal,
PRUint32 aLineNr, PRUint32 aColumn, PRUint32 aFlags,
const nsAString& aErrorMsg,
const nsAString& aFileName,
const nsAString& aSourceLine,
PRBool aDispatchEvent,
PRUint64 aWindowID)
: mScriptGlobal(aScriptGlobal), mLineNr(aLineNr), mColumn(aColumn),
mFlags(aFlags), mErrorMsg(aErrorMsg), mFileName(aFileName),
mSourceLine(aSourceLine), mDispatchEvent(aDispatchEvent),
mWindowID(aWindowID)
{}
NS_IMETHOD Run()
{
nsEventStatus status = nsEventStatus_eIgnore;
// First, notify the DOM that we have a script error.
if (mDispatchEvent) {
nsCOMPtr<nsPIDOMWindow> win(do_QueryInterface(mScriptGlobal));
nsIDocShell* docShell = win ? win->GetDocShell() : nsnull;
if (docShell &&
!JSREPORT_IS_WARNING(mFlags) &&
!sHandlingScriptError) {
sHandlingScriptError = PR_TRUE; // Recursion prevention
nsRefPtr<nsPresContext> presContext;
docShell->GetPresContext(getter_AddRefs(presContext));
if (presContext) {
nsScriptErrorEvent errorevent(PR_TRUE, NS_LOAD_ERROR);
errorevent.fileName = mFileName.get();
nsCOMPtr<nsIScriptObjectPrincipal> sop(do_QueryInterface(win));
NS_ENSURE_STATE(sop);
nsIPrincipal* p = sop->GetPrincipal();
NS_ENSURE_STATE(p);
PRBool sameOrigin = mFileName.IsVoid();
if (p && !sameOrigin) {
nsCOMPtr<nsIURI> errorURI;
NS_NewURI(getter_AddRefs(errorURI), mFileName);
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));
}
}
NS_NAMED_LITERAL_STRING(xoriginMsg, "Script error.");
if (sameOrigin) {
errorevent.errorMsg = mErrorMsg.get();
errorevent.lineNr = mLineNr;
} else {
NS_WARNING("Not same origin error!");
errorevent.errorMsg = xoriginMsg.get();
errorevent.lineNr = 0;
// FIXME: once the principal of the script is not tied to
// the filename, we can stop using the post-redirect
// filename if we want and remove this line. Note that
// apparently we can't handle null filenames in the error
// event dispatching code.
static PRUnichar nullFilename[] = { PRUnichar(0) };
errorevent.fileName = nullFilename;
}
nsEventDispatcher::Dispatch(win, presContext, &errorevent, nsnull,
&status);
}
sHandlingScriptError = PR_FALSE;
}
}
if (status != nsEventStatus_eConsumeNoDefault) {
// Make an nsIScriptError and populate it with information from
// this error.
nsCOMPtr<nsIScriptError> errorObject =
do_CreateInstance("@mozilla.org/scripterror;1");
if (errorObject != nsnull) {
nsresult rv = NS_ERROR_NOT_AVAILABLE;
// Set category to chrome or content
nsCOMPtr<nsIScriptObjectPrincipal> scriptPrincipal =
do_QueryInterface(mScriptGlobal);
NS_ASSERTION(scriptPrincipal, "Global objects must implement "
"nsIScriptObjectPrincipal");
nsCOMPtr<nsIPrincipal> systemPrincipal;
sSecurityManager->GetSystemPrincipal(getter_AddRefs(systemPrincipal));
const char * category =
scriptPrincipal->GetPrincipal() == systemPrincipal
? "chrome javascript"
: "content javascript";
nsCOMPtr<nsIScriptError2> error2(do_QueryInterface(errorObject));
if (error2) {
rv = error2->InitWithWindowID(mErrorMsg.get(), mFileName.get(),
mSourceLine.get(),
mLineNr, mColumn, mFlags,
category, mWindowID);
} else {
rv = errorObject->Init(mErrorMsg.get(), mFileName.get(),
mSourceLine.get(),
mLineNr, mColumn, mFlags,
category);
}
if (NS_SUCCEEDED(rv)) {
nsCOMPtr<nsIConsoleService> consoleService =
do_GetService(NS_CONSOLESERVICE_CONTRACTID, &rv);
if (NS_SUCCEEDED(rv)) {
consoleService->LogMessage(errorObject);
}
}
}
}
return NS_OK;
}
nsCOMPtr<nsIScriptGlobalObject> mScriptGlobal;
PRUint32 mLineNr;
PRUint32 mColumn;
PRUint32 mFlags;
nsString mErrorMsg;
nsString mFileName;
nsString mSourceLine;
PRBool mDispatchEvent;
PRUint64 mWindowID;
static PRBool sHandlingScriptError;
};
PRBool ScriptErrorEvent::sHandlingScriptError = PR_FALSE;
// 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_IsScriptFrame(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);
// 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;
if (!report->filename) {
fileName.SetIsVoid(PR_TRUE);
} else {
fileName.AssignWithConversion(report->filename);
}
const PRUnichar *m = reinterpret_cast<const PRUnichar*>
(report->ucmessage);
if (m) {
msg.Assign(m);
}
if (msg.IsEmpty() && message) {
msg.AssignWithConversion(message);
}
/* 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.
*/
nsAutoString sourceLine;
sourceLine.Assign(reinterpret_cast<const PRUnichar*>(report->uclinebuf));
nsCOMPtr<nsPIDOMWindow> win = do_QueryInterface(globalObject);
PRUint64 windowID = win ? win->WindowID() : 0;
nsContentUtils::AddScriptRunner(
new ScriptErrorEvent(globalObject, report->lineno,
report->uctokenptr - report->uclinebuf,
report->flags, msg, fileName, sourceLine,
report->errorNumber != JSMSG_OUT_OF_MEMORY,
windowID));
}
}
#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<const PRUnichar*>(report->ucmessage),
error);
} else {
error.Append(message);
}
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
}
#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<nsIXPConnectWrappedNative> wrapper;
xpc->GetWrappedNativeOfJSObject(cx, obj, getter_AddRefs(wrapper));
if (wrapper) {
nsCOMPtr<nsPIDOMWindow> win = do_QueryWrappedNative(wrapper);
if (win) {
return static_cast<nsGlobalWindow *>
(static_cast<nsPIDOMWindow *>(win));
}
}
return nsnull;
}
void
PrintWinURI(nsGlobalWindow *win)
{
if (!win) {
printf("No window passed in.\n");
return;
}
nsCOMPtr<nsIDocument> 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<nsIURI> 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());
}
void
DumpString(const nsAString &str)
{
printf("%s\n", NS_ConvertUTF16toUTF8(str).get());
}
#endif
static already_AddRefed<nsIPrompt>
GetPromptFromContext(nsJSContext* ctx)
{
nsCOMPtr<nsPIDOMWindow> win(do_QueryInterface(ctx->GetGlobalObject()));
NS_ENSURE_TRUE(win, nsnull);
nsIDocShell *docShell = win->GetDocShell();
NS_ENSURE_TRUE(docShell, nsnull);
nsCOMPtr<nsIInterfaceRequestor> 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<nsJSContext *>(::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;
JS_MaybeGC(cx);
// Now restore the callback time and count, in case they got reset.
ctx->mOperationCallbackTime = callbackTime;
ctx->mModalStateTime = modalStateTime;
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.
JSObject* global = ::JS_GetGlobalForScopeChain(cx);
PRBool isTrackingChromeCodeTime =
global && xpc::AccessCheck::isChrome(global->getCompartment());
if (duration < (isTrackingChromeCodeTime ?
sMaxChromeScriptRunTime : sMaxScriptRunTime)) {
return JS_TRUE;
}
if (!nsContentUtils::IsSafeToRunScript()) {
// If it isn't safe to run script, then it isn't safe to bring up the
// prompt (since that will cause the event loop to spin). In this case
// (which is rare), we just stop the script... But report a warning so
// that developers have some idea of what went wrong.
JS_ReportWarning(cx, "A long running script was terminated");
return JS_FALSE;
}
// 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<nsIPrompt> 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<jsdIExecutionHook> jsdHook;
nsCOMPtr<jsdIDebuggerService> 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 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 = 0; //In case user exits dialog by clicking X
PRBool neverShowDlgChk = PR_FALSE;
PRUint32 buttonFlags = nsIPrompt::BUTTON_POS_1_DEFAULT +
(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, waitButton, stopButton,
debugButton, neverShowDlg, &neverShowDlgChk,
&buttonPressed);
::JS_SetOperationCallback(cx, DOMOperationCallback);
if (NS_FAILED(rv) || (buttonPressed == 0)) {
// 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:
JS_SetFrameReturnValue(cx, fp, rval);
return JS_TRUE;
case JSTRAP_ERROR:
JS_ClearPendingException(cx);
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";
#ifdef DEBUG
static const char js_strict_debug_option_str[] = JS_OPTIONS_DOT_STR "strict.debug";
#endif
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_tracejit_content_str[] = JS_OPTIONS_DOT_STR "tracejit.content";
static const char js_tracejit_chrome_str[] = JS_OPTIONS_DOT_STR "tracejit.chrome";
static const char js_methodjit_content_str[] = JS_OPTIONS_DOT_STR "methodjit.content";
static const char js_methodjit_chrome_str[] = JS_OPTIONS_DOT_STR "methodjit.chrome";
static const char js_profiling_content_str[] = JS_OPTIONS_DOT_STR "jitprofiling.content";
static const char js_profiling_chrome_str[] = JS_OPTIONS_DOT_STR "jitprofiling.chrome";
int
nsJSContext::JSOptionChangedCallback(const char *pref, void *data)
{
nsJSContext *context = reinterpret_cast<nsJSContext *>(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<nsIDOMChromeWindow> chromeWindow(do_QueryInterface(global));
PRBool useTraceJIT = nsContentUtils::GetBoolPref(chromeWindow ?
js_tracejit_chrome_str :
js_tracejit_content_str);
PRBool useMethodJIT = nsContentUtils::GetBoolPref(chromeWindow ?
js_methodjit_chrome_str :
js_methodjit_content_str);
PRBool useProfiling = nsContentUtils::GetBoolPref(chromeWindow ?
js_profiling_chrome_str :
js_profiling_content_str);
nsCOMPtr<nsIXULRuntime> xr = do_GetService(XULRUNTIME_SERVICE_CONTRACTID);
if (xr) {
PRBool safeMode = PR_FALSE;
xr->GetInSafeMode(&safeMode);
if (safeMode) {
useTraceJIT = PR_FALSE;
useMethodJIT = PR_FALSE;
useProfiling = PR_FALSE;
}
}
if (useTraceJIT)
newDefaultJSOptions |= JSOPTION_JIT;
else
newDefaultJSOptions &= ~JSOPTION_JIT;
if (useMethodJIT)
newDefaultJSOptions |= JSOPTION_METHODJIT;
else
newDefaultJSOptions &= ~JSOPTION_METHODJIT;
if (useProfiling)
newDefaultJSOptions |= JSOPTION_PROFILING;
else
newDefaultJSOptions &= ~JSOPTION_PROFILING;
#ifdef DEBUG
// In debug builds, warnings are enabled in chrome context if javascript.options.strict.debug is true
PRBool strictDebug = nsContentUtils::GetBoolPref(js_strict_debug_option_str);
// Note this callback is also called from context's InitClasses thus we don't
// need to enable this directly from InitContext
if (strictDebug && (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),
mExecuteDepth(0)
{
++sContextCount;
mDefaultJSOptions = JSOPTION_PRIVATE_IS_NSISUPPORTS | JSOPTION_ANONFUNFIX;
mContext = ::JS_NewContext(aRuntime, gStackSize);
if (mContext) {
::JS_SetContextPrivate(mContext, static_cast<nsIScriptContext *>(this));
// Preserve any flags the context callback might have set.
mDefaultJSOptions |= ::JS_GetOptions(mContext);
// 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);
xpc_LocalizeContext(mContext);
}
mIsInitialized = PR_FALSE;
mTerminations = nsnull;
mScriptsEnabled = PR_TRUE;
mOperationCallbackTime = 0;
mModalStateTime = 0;
mModalStateDepth = 0;
mProcessingScriptTag = PR_FALSE;
}
nsJSContext::~nsJSContext()
{
#ifdef DEBUG
nsCycleCollector_DEBUG_wasFreed(static_cast<nsIScriptContext*>(this));
#endif
NS_PRECONDITION(!mTerminations, "Shouldn't have termination funcs by now");
mGlobalObjectRef = 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);
}
}
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(mGlobalObjectRef)
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INTERNAL(nsJSContext)
NS_IMPL_CYCLE_COLLECTION_DESCRIBE(nsJSContext, tmp->GetCCRefcnt())
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mGlobalObjectRef)
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(nsIScriptContextPrincipal)
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_TIME_FUNCTION_MIN_FMT(1.0, "%s (line %d) (url: %s, line: %d)", MOZ_FUNCTION_NAME,
__LINE__, aURL, aLineNo);
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<nsIScriptObjectPrincipal> 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<nsIJSContextStack> 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;
rv = sSecurityManager->PushContextPrincipal(mContext, nsnull, principal);
NS_ENSURE_SUCCESS(rv, rv);
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);
JSAutoEnterCompartment ac;
if (!ac.enter(mContext, (JSObject *)aScopeObject)) {
JSPRINCIPALS_DROP(mContext, jsprin);
stack->Pop(nsnull);
return NS_ERROR_FAILURE;
}
++mExecuteDepth;
ok = ::JS_EvaluateUCScriptForPrincipalsVersion(mContext,
(JSObject *)aScopeObject,
jsprin,
(jschar*)PromiseFlatString(aScript).get(),
aScript.Length(),
aURL,
aLineNo,
&val,
JSVersion(aVersion));
--mExecuteDepth;
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<jsval*>(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;
}
}
sSecurityManager->PopContextPrincipal(mContext);
// 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) {
goto error;
}
size_t length;
const jschar *chars;
chars = ::JS_GetStringCharsAndLength(cx, jsstring, &length);
if (!chars) {
goto error;
}
result->Assign(chars, length);
return NS_OK;
error:
// 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.
result->Truncate();
if (isUndefined) {
*isUndefined = PR_TRUE;
}
if (!::JS_IsExceptionPending(cx)) {
// JS_ValueToString()/JS_GetStringCharsAndLength returned null w/o an
// exception pending. That means we're OOM.
return NS_ERROR_OUT_OF_MEMORY;
}
return NS_OK;
}
nsIScriptObjectPrincipal*
nsJSContext::GetObjectPrincipal()
{
nsCOMPtr<nsIScriptObjectPrincipal> prin = do_QueryInterface(GetGlobalObject());
return prin;
}
nsresult
nsJSContext::EvaluateString(const nsAString& aScript,
void *aScopeObject,
nsIPrincipal *aPrincipal,
const char *aURL,
PRUint32 aLineNo,
PRUint32 aVersion,
nsAString *aRetValue,
PRBool* aIsUndefined)
{
NS_TIME_FUNCTION_MIN_FMT(1.0, "%s (line %d) (url: %s, line: %d)", MOZ_FUNCTION_NAME,
__LINE__, aURL, aLineNo);
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<nsIScriptObjectPrincipal> 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<nsIJSContextStack> 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;
rv = sSecurityManager->PushContextPrincipal(mContext, nsnull, principal);
NS_ENSURE_SUCCESS(rv, rv);
nsJSContext::TerminationFuncHolder holder(this);
++mExecuteDepth;
// 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);
JSAutoEnterCompartment ac;
if (!ac.enter(mContext, (JSObject *)aScopeObject)) {
stack->Pop(nsnull);
JSPRINCIPALS_DROP(mContext, jsprin);
return NS_ERROR_FAILURE;
}
ok = ::JS_EvaluateUCScriptForPrincipalsVersion(mContext,
(JSObject *)aScopeObject,
jsprin,
(jschar*)PromiseFlatString(aScript).get(),
aScript.Length(),
aURL,
aLineNo,
vp,
JSVersion(aVersion));
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);
JSAutoEnterCompartment ac;
if (!ac.enter(mContext, (JSObject *)aScopeObject)) {
stack->Pop(nsnull);
}
rv = JSValueToAString(mContext, val, aRetValue, aIsUndefined);
}
else {
if (aIsUndefined) {
*aIsUndefined = PR_TRUE;
}
if (aRetValue) {
aRetValue->Truncate();
}
}
--mExecuteDepth;
sSecurityManager->PopContextPrincipal(mContext);
// 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);
JSScript* script =
::JS_CompileUCScriptForPrincipalsVersion(mContext,
(JSObject *)aScopeObject,
jsprin,
(jschar*) aText,
aTextLength,
aURL,
aLineNo,
JSVersion(aVersion));
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<nsIJSContextStack> 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;
JSObject *scriptObj = (JSObject*)aScriptObject;
nsCOMPtr<nsIPrincipal> principal;
rv = sSecurityManager->GetObjectPrincipal(mContext, scriptObj, getter_AddRefs(principal));
NS_ENSURE_SUCCESS(rv, rv);
rv = sSecurityManager->PushContextPrincipal(mContext, nsnull, principal);
NS_ENSURE_SUCCESS(rv, rv);
nsJSContext::TerminationFuncHolder holder(this);
JSAutoRequest ar(mContext);
++mExecuteDepth;
ok = ::JS_ExecuteScript(mContext,
(JSObject *)aScopeObject,
(JSScript*)::JS_GetPrivate(mContext, scriptObj),
&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();
}
}
--mExecuteDepth;
sSecurityManager->PopContextPrincipal(mContext);
// 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;
}
#ifdef DEBUG
PRBool
AtomIsEventHandlerName(nsIAtom *aName)
{
const PRUnichar *name = aName->GetUTF16String();
const PRUnichar *cp;
PRUnichar c;
for (cp = name; *cp != '\0'; ++cp)
{
c = *cp;
if ((c < 'A' || c > 'Z') && (c < 'a' || c > 'z'))
return PR_FALSE;
}
return PR_TRUE;
}
#endif
// 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::WrapNative(mContext, (JSObject *)aScope, aTarget, &v);
NS_ENSURE_SUCCESS(rv, rv);
#ifdef NS_DEBUG
nsCOMPtr<nsISupports> targetSupp = do_QueryInterface(aTarget);
nsCOMPtr<nsISupports> 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_TIME_FUNCTION_MIN_FMT(1.0, "%s (line %d) (url: %s, line: %d)", MOZ_FUNCTION_NAME,
__LINE__, aURL, aLineNo);
NS_ENSURE_TRUE(mIsInitialized, NS_ERROR_NOT_INITIALIZED);
NS_PRECONDITION(AtomIsEventHandlerName(aName), "Bad event name");
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;
}
#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);
JSFunction* fun =
::JS_CompileUCFunctionForPrincipalsVersion(mContext,
nsnull, nsnull,
nsAtomCString(aName).get(), aArgCount, aArgNames,
(jschar*)PromiseFlatString(aBody).get(),
aBody.Length(),
aURL, aLineNo, JSVersion(aVersion));
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_TIME_FUNCTION_FMT(1.0, "%s (line %d) (function: %s, url: %s, line: %d)", MOZ_FUNCTION_NAME,
__LINE__, aName.BeginReading(), aURL, aLineNo);
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<nsIScriptObjectPrincipal> 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);
JSFunction* fun =
::JS_CompileUCFunctionForPrincipalsVersion(mContext,
aShared ? nsnull : target, jsprin,
PromiseFlatCString(aName).get(),
aArgCount, aArgArray,
(jschar*)PromiseFlatString(aBody).get(),
aBody.Length(),
aURL, aLineNo,
JSVersion(aVersion));
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;
}
#ifdef NS_FUNCTION_TIMER
{
JSObject *obj = static_cast<JSObject *>(aHandler);
JSString *id = JS_GetFunctionId(static_cast<JSFunction *>(JS_GetPrivate(mContext, obj)));
JSAutoByteString bytes;
const char *name = !id ? "anonymous" : bytes.encode(mContext, id) ? bytes.ptr() : "<error>";
NS_TIME_FUNCTION_FMT(1.0, "%s (line %d) (function: %s)", MOZ_FUNCTION_NAME, __LINE__, name);
}
#endif
JSAutoRequest ar(mContext);
JSObject* target = nsnull;
nsresult rv = JSObjectFromInterface(aTarget, aScope, &target);
NS_ENSURE_SUCCESS(rv, rv);
js::AutoObjectRooter targetVal(mContext, 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.
nsCxPusher pusher;
if (!pusher.Push(mContext, PR_TRUE))
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.
PRUint32 argc = 0;
jsval *argv = nsnull;
js::LazilyConstructed<nsAutoPoolRelease> poolRelease;
js::LazilyConstructed<js::AutoArrayRooter> tvr;
// 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,
&argv, poolRelease, tvr);
NS_ENSURE_SUCCESS(rv, rv);
JSObject *funobj = static_cast<JSObject *>(aHandler);
nsCOMPtr<nsIPrincipal> principal;
rv = sSecurityManager->GetObjectPrincipal(mContext, funobj,
getter_AddRefs(principal));
NS_ENSURE_SUCCESS(rv, rv);
JSStackFrame *currentfp = nsnull;
rv = sSecurityManager->PushContextPrincipal(mContext,
JS_FrameIterator(mContext, &currentfp),
principal);
NS_ENSURE_SUCCESS(rv, rv);
jsval funval = OBJECT_TO_JSVAL(funobj);
JSAutoEnterCompartment ac;
if (!ac.enter(mContext, target)) {
sSecurityManager->PopContextPrincipal(mContext);
return NS_ERROR_FAILURE;
}
++mExecuteDepth;
PRBool ok = ::JS_CallFunctionValue(mContext, target,
funval, argc, argv, &rval);
--mExecuteDepth;
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;
}
sSecurityManager->PopContextPrincipal(mContext);
}
pusher.Pop();
// Convert to variant before calling ScriptEvaluated, as it may GC, meaning
// we would need to root rval.
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);
NS_PRECONDITION(AtomIsEventHandlerName(aName), "Bad event name");
JSAutoRequest ar(mContext);
// Get the jsobject associated with this target
JSObject *target = nsnull;
nsresult rv = JSObjectFromInterface(aTarget, aScope, &target);
NS_ENSURE_SUCCESS(rv, rv);
JSObject *funobj = (JSObject*) aHandler;
#ifdef DEBUG
{
JSAutoEnterCompartment ac;
if (!ac.enter(mContext, funobj)) {
return NS_ERROR_FAILURE;
}
NS_ASSERTION(JS_TypeOfValue(mContext,
OBJECT_TO_JSVAL(funobj)) == JSTYPE_FUNCTION,
"Event handler object not a function");
}
#endif
JSAutoEnterCompartment ac;
if (!ac.enter(mContext, target)) {
return NS_ERROR_FAILURE;
}
// Push our JSContext on our thread's context stack, in case native code
// called from JS calls back into JS via XPConnect.
nsCOMPtr<nsIJSContextStack> 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, nsAtomCString(aName).get(),
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)
{
NS_PRECONDITION(AtomIsEventHandlerName(aName), "Bad event name");
JSAutoRequest ar(mContext);
JSObject *obj = nsnull;
nsresult rv = JSObjectFromInterface(aTarget, aScope, &obj);
NS_ENSURE_SUCCESS(rv, rv);
JSAutoEnterCompartment ac;
if (!ac.enter(mContext, obj)) {
return NS_ERROR_FAILURE;
}
jsval funval;
if (!JS_LookupProperty(mContext, obj,
nsAtomCString(aName).get(), &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<JSScript*>
(::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<const char*>
(::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_TIME_FUNCTION_MIN(1.0);
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) {
return nsnull;
}
OBJ_TO_INNER_OBJECT(mContext, global);
if (!global) {
return nsnull;
}
JSClass *c = JS_GET_CLASS(mContext, global);
if (!c || ((~c->flags) & (JSCLASS_HAS_PRIVATE |
JSCLASS_PRIVATE_IS_NSISUPPORTS))) {
return nsnull;
}
JSAutoEnterCompartment ac;
// NB: This AutoCrossCompartmentCall is only here to silence a warning. If
// it fails, nothing bad will happen.
ac.enterAndIgnoreErrors(mContext, global);
nsCOMPtr<nsIScriptGlobalObject> sgo;
nsISupports *priv =
(nsISupports *)::JS_GetPrivate(mContext, global);
nsCOMPtr<nsIXPConnectWrappedNative> 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.
nsCOMPtr<nsPIDOMWindow> pwin(do_QueryInterface(sgo));
if (!pwin)
return sgo;
return static_cast<nsGlobalWindow *>(pwin->GetOuterWindow());
}
void *
nsJSContext::GetNativeGlobal()
{
return ::JS_GetGlobalObject(mContext);
}
nsresult
nsJSContext::CreateNativeGlobalForInner(
nsIScriptGlobalObject *aNewInner,
PRBool aIsChrome,
nsIPrincipal *aPrincipal,
void **aNativeGlobal, nsISupports **aHolder)
{
nsIXPConnect *xpc = nsContentUtils::XPConnect();
PRUint32 flags = aIsChrome? nsIXPConnect::FLAG_SYSTEM_GLOBAL_OBJECT : 0;
nsCOMPtr<nsIXPConnectJSObjectHolder> jsholder;
nsCOMPtr<nsIPrincipal> systemPrincipal;
if (aIsChrome) {
nsIScriptSecurityManager *ssm = nsContentUtils::GetSecurityManager();
ssm->GetSystemPrincipal(getter_AddRefs(systemPrincipal));
}
nsresult rv = xpc->
InitClassesWithNewWrappedGlobal(mContext,
aNewInner, NS_GET_IID(nsISupports),
aIsChrome ? systemPrincipal.get() : aPrincipal,
nsnull, flags,
getter_AddRefs(jsholder));
if (NS_FAILED(rv))
return rv;
jsholder->GetJSObject(reinterpret_cast<JSObject **>(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 *outerGlobal = (JSObject *)aOuterGlobal;
// Now that we're connecting the outer global to the inner one,
// we must have transplanted it. The JS engine tries to maintain
// the global object's compartment as its default compartment,
// so update that now since it might have changed.
JS_SetGlobalObject(mContext, outerGlobal);
NS_ASSERTION(JS_GetPrototype(mContext, outerGlobal) ==
JS_GetPrototype(mContext, newInnerJSObject),
"outer and inner globals should have the same prototype");
return NS_OK;
}
void *
nsJSContext::GetNativeContext()
{
return mContext;
}
nsresult
nsJSContext::InitContext()
{
// 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);
return NS_OK;
}
nsresult
nsJSContext::CreateOuterObject(nsIScriptGlobalObject *aGlobalObject,
nsIScriptGlobalObject *aCurrentInner)
{
mGlobalObjectRef = aGlobalObject;
nsCOMPtr<nsIDOMChromeWindow> 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 <!-- script hiding hack from JS-in-HTML daze
// (introduced in 1995 for graceful script degradation in Netscape 1,
// Mosaic, and other pre-JS browsers).
JS_SetOptions(mContext, JS_GetOptions(mContext) | JSOPTION_XML);
}
JSObject *outer =
NS_NewOuterWindowProxy(mContext, aCurrentInner->GetGlobalJSObject());
if (!outer) {
return NS_ERROR_FAILURE;
}
return SetOuterObject(outer);
}
nsresult
nsJSContext::SetOuterObject(void *aOuterObject)
{
JSObject *outer = static_cast<JSObject *>(aOuterObject);
// Force our context's global object to be the outer.
JS_SetGlobalObject(mContext, outer);
// NB: JS_SetGlobalObject sets mContext->compartment.
JSObject *inner = JS_GetParent(mContext, outer);
nsIXPConnect *xpc = nsContentUtils::XPConnect();
nsCOMPtr<nsIXPConnectWrappedNative> wrapper;
nsresult rv = xpc->GetWrappedNativeOfJSObject(mContext, inner,
getter_AddRefs(wrapper));
NS_ENSURE_SUCCESS(rv, rv);
NS_ABORT_IF_FALSE(wrapper, "bad wrapper");
wrapper->RefreshPrototype();
JS_SetPrototype(mContext, outer, JS_GetPrototype(mContext, inner));
return NS_OK;
}
nsresult
nsJSContext::InitOuterWindow()
{
JSObject *global = JS_GetGlobalObject(mContext);
OBJ_TO_INNER_OBJECT(mContext, global);
nsresult rv = InitClasses(global); // this will complete global object initialization
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
nsresult
nsJSContext::InitializeExternalClasses()
{
nsScriptNameSpaceManager *nameSpaceManager = nsJSRuntime::GetNameSpaceManager();
NS_ENSURE_TRUE(nameSpaceManager, NS_ERROR_NOT_INITIALIZED);
return nameSpaceManager->InitForContext(this);
}
nsresult
nsJSContext::SetProperty(void *aTarget, const char *aPropName, nsISupports *aArgs)
{
PRUint32 argc;
jsval *argv = nsnull;
JSAutoRequest ar(mContext);
js::LazilyConstructed<nsAutoPoolRelease> poolRelease;
js::LazilyConstructed<js::AutoArrayRooter> tvr;
nsresult rv;
rv = ConvertSupportsTojsvals(aArgs, GetNativeGlobal(), &argc,
&argv, poolRelease, tvr);
NS_ENSURE_SUCCESS(rv, rv);
jsval vargs;
// got the arguments, now attach them.
// window.dialogArguments is supposed to be an array if a JS array
// was passed to showModalDialog(), deal with that here.
if (strcmp(aPropName, "dialogArguments") == 0 && argc <= 1) {
vargs = argc ? argv[0] : JSVAL_VOID;
} else {
for (PRUint32 i = 0; i < argc; ++i) {
if (!JS_WrapValue(mContext, &argv[i])) {
return NS_ERROR_FAILURE;
}
}
JSObject *args = ::JS_NewArrayObject(mContext, argc, argv);
vargs = OBJECT_TO_JSVAL(args);
}
// Make sure to use JS_DefineProperty here so that we can override
// readonly XPConnect properties here as well (read dialogArguments).
rv = ::JS_DefineProperty(mContext, reinterpret_cast<JSObject *>(aTarget),
aPropName, vargs, nsnull, nsnull, 0) ?
NS_OK : NS_ERROR_FAILURE;
return rv;
}
nsresult
nsJSContext::ConvertSupportsTojsvals(nsISupports *aArgs,
void *aScope,
PRUint32 *aArgc,
jsval **aArgv,
js::LazilyConstructed<nsAutoPoolRelease> &aPoolRelease,
js::LazilyConstructed<js::AutoArrayRooter> &aRooter)
{
nsresult rv = NS_OK;
// If the array implements nsIJSArgArray, just grab the values directly.
nsCOMPtr<nsIJSArgArray> fastArray = do_QueryInterface(aArgs);
if (fastArray != nsnull)
return fastArray->GetArgs(aArgc, reinterpret_cast<void **>(aArgv));
// Take the slower path converting each item.
// Handle only nsIArray and nsIVariant. nsIArray is only needed for
// SetProperty('arguments', ...);
*aArgv = nsnull;
*aArgc = 0;
nsIXPConnect *xpc = nsContentUtils::XPConnect();
NS_ENSURE_TRUE(xpc, NS_ERROR_UNEXPECTED);
if (!aArgs)
return NS_OK;
PRUint32 argCtr, argCount;
// This general purpose function may need to convert an arg array
// (window.arguments, event-handler args) and a generic property.
nsCOMPtr<nsIArray> argsArray(do_QueryInterface(aArgs));
if (argsArray) {
rv = argsArray->GetLength(&argCount);
NS_ENSURE_SUCCESS(rv, rv);
if (argCount == 0)
return NS_OK;
} else {
argCount = 1; // the nsISupports which is not an array
}
void *mark = JS_ARENA_MARK(&mContext->tempPool);
jsval *argv;
size_t nbytes = argCount * sizeof(jsval);
JS_ARENA_ALLOCATE_CAST(argv, jsval *, &mContext->tempPool, nbytes);
NS_ENSURE_TRUE(argv, NS_ERROR_OUT_OF_MEMORY);
memset(argv, 0, nbytes); /* initialize so GC-able */
// Use the caller's auto guards to release and unroot.
aPoolRelease.construct(&mContext->tempPool, mark);
aRooter.construct(mContext, argCount, argv);
if (argsArray) {
for (argCtr = 0; argCtr < argCount && NS_SUCCEEDED(rv); argCtr++) {
nsCOMPtr<nsISupports> arg;
jsval *thisval = argv + argCtr;
argsArray->QueryElementAt(argCtr, NS_GET_IID(nsISupports),
getter_AddRefs(arg));
if (!arg) {
*thisval = JSVAL_NULL;
continue;
}
nsCOMPtr<nsIVariant> variant(do_QueryInterface(arg));
if (variant != nsnull) {
rv = xpc->VariantToJS(mContext, (JSObject *)aScope, variant,
thisval);
} else {
// And finally, support the nsISupportsPrimitives supplied
// by the AppShell. It generally will pass only strings, but
// as we have code for handling all, we may as well use it.
rv = AddSupportsPrimitiveTojsvals(arg, thisval);
if (rv == NS_ERROR_NO_INTERFACE) {
// something else - probably an event object or similar -
// just wrap it.
#ifdef NS_DEBUG
// but first, check its not another nsISupportsPrimitive, as
// these are now deprecated for use with script contexts.
nsCOMPtr<nsISupportsPrimitive> prim(do_QueryInterface(arg));
NS_ASSERTION(prim == nsnull,
"Don't pass nsISupportsPrimitives - use nsIVariant!");
#endif
nsCOMPtr<nsIXPConnectJSObjectHolder> wrapper;
jsval v;
rv = nsContentUtils::WrapNative(mContext, (JSObject *)aScope, arg,
&v, getter_AddRefs(wrapper));
if (NS_SUCCEEDED(rv)) {
*thisval = v;
}
}
}
}
} else {
nsCOMPtr<nsIVariant> variant(do_QueryInterface(aArgs));
if (variant)
rv = xpc->VariantToJS(mContext, (JSObject *)aScope, variant, argv);
else {
NS_ERROR("Not an array, not an interface?");
rv = NS_ERROR_UNEXPECTED;
}
}
if (NS_FAILED(rv))
return rv;
*aArgv = argv;
*aArgc = argCount;
return NS_OK;
}
// This really should go into xpconnect somewhere...
nsresult
nsJSContext::AddSupportsPrimitiveTojsvals(nsISupports *aArg, jsval *aArgv)
{
NS_PRECONDITION(aArg, "Empty arg");
nsCOMPtr<nsISupportsPrimitive> argPrimitive(do_QueryInterface(aArg));
if (!argPrimitive)
return NS_ERROR_NO_INTERFACE;
JSContext *cx = mContext;
PRUint16 type;
argPrimitive->GetType(&type);
switch(type) {
case nsISupportsPrimitive::TYPE_CSTRING : {
nsCOMPtr<nsISupportsCString> p(do_QueryInterface(argPrimitive));
NS_ENSURE_TRUE(p, NS_ERROR_UNEXPECTED);
nsCAutoString data;
p->GetData(data);
JSString *str = ::JS_NewStringCopyN(cx, data.get(), data.Length());
NS_ENSURE_TRUE(str, NS_ERROR_OUT_OF_MEMORY);
*aArgv = STRING_TO_JSVAL(str);
break;
}
case nsISupportsPrimitive::TYPE_STRING : {
nsCOMPtr<nsISupportsString> p(do_QueryInterface(argPrimitive));
NS_ENSURE_TRUE(p, NS_ERROR_UNEXPECTED);
nsAutoString data;
p->GetData(data);
// cast is probably safe since wchar_t and jschar are expected
// to be equivalent; both unsigned 16-bit entities
JSString *str =
::JS_NewUCStringCopyN(cx,
reinterpret_cast<const jschar *>(data.get()),
data.Length());
NS_ENSURE_TRUE(str, NS_ERROR_OUT_OF_MEMORY);
*aArgv = STRING_TO_JSVAL(str);
break;
}
case nsISupportsPrimitive::TYPE_PRBOOL : {
nsCOMPtr<nsISupportsPRBool> p(do_QueryInterface(argPrimitive));
NS_ENSURE_TRUE(p, NS_ERROR_UNEXPECTED);
PRBool data;
p->GetData(&data);
*aArgv = BOOLEAN_TO_JSVAL(data);
break;
}
case nsISupportsPrimitive::TYPE_PRUINT8 : {
nsCOMPtr<nsISupportsPRUint8> p(do_QueryInterface(argPrimitive));
NS_ENSURE_TRUE(p, NS_ERROR_UNEXPECTED);
PRUint8 data;
p->GetData(&data);
*aArgv = INT_TO_JSVAL(data);
break;
}
case nsISupportsPrimitive::TYPE_PRUINT16 : {
nsCOMPtr<nsISupportsPRUint16> p(do_QueryInterface(argPrimitive));
NS_ENSURE_TRUE(p, NS_ERROR_UNEXPECTED);
PRUint16 data;
p->GetData(&data);
*aArgv = INT_TO_JSVAL(data);
break;
}
case nsISupportsPrimitive::TYPE_PRUINT32 : {
nsCOMPtr<nsISupportsPRUint32> p(do_QueryInterface(argPrimitive));
NS_ENSURE_TRUE(p, NS_ERROR_UNEXPECTED);
PRUint32 data;
p->GetData(&data);
*aArgv = INT_TO_JSVAL(data);
break;
}
case nsISupportsPrimitive::TYPE_CHAR : {
nsCOMPtr<nsISupportsChar> p(do_QueryInterface(argPrimitive));
NS_ENSURE_TRUE(p, NS_ERROR_UNEXPECTED);
char data;
p->GetData(&data);
JSString *str = ::JS_NewStringCopyN(cx, &data, 1);
NS_ENSURE_TRUE(str, NS_ERROR_OUT_OF_MEMORY);
*aArgv = STRING_TO_JSVAL(str);
break;
}
case nsISupportsPrimitive::TYPE_PRINT16 : {
nsCOMPtr<nsISupportsPRInt16> p(do_QueryInterface(argPrimitive));
NS_ENSURE_TRUE(p, NS_ERROR_UNEXPECTED);
PRInt16 data;
p->GetData(&data);
*aArgv = INT_TO_JSVAL(data);
break;
}
case nsISupportsPrimitive::TYPE_PRINT32 : {
nsCOMPtr<nsISupportsPRInt32> p(do_QueryInterface(argPrimitive));
NS_ENSURE_TRUE(p, NS_ERROR_UNEXPECTED);
PRInt32 data;
p->GetData(&data);
*aArgv = INT_TO_JSVAL(data);
break;
}
case nsISupportsPrimitive::TYPE_FLOAT : {
nsCOMPtr<nsISupportsFloat> p(do_QueryInterface(argPrimitive));
NS_ENSURE_TRUE(p, NS_ERROR_UNEXPECTED);
float data;
p->GetData(&data);
JSBool ok = ::JS_NewNumberValue(cx, data, aArgv);
NS_ENSURE_TRUE(ok, NS_ERROR_OUT_OF_MEMORY);
break;
}
case nsISupportsPrimitive::TYPE_DOUBLE : {
nsCOMPtr<nsISupportsDouble> p(do_QueryInterface(argPrimitive));
NS_ENSURE_TRUE(p, NS_ERROR_UNEXPECTED);
double data;
p->GetData(&data);
JSBool ok = ::JS_NewNumberValue(cx, data, aArgv);
NS_ENSURE_TRUE(ok, NS_ERROR_OUT_OF_MEMORY);
break;
}
case nsISupportsPrimitive::TYPE_INTERFACE_POINTER : {
nsCOMPtr<nsISupportsInterfacePointer> p(do_QueryInterface(argPrimitive));
NS_ENSURE_TRUE(p, NS_ERROR_UNEXPECTED);
nsCOMPtr<nsISupports> data;
nsIID *iid = nsnull;
p->GetData(getter_AddRefs(data));
p->GetDataIID(&iid);
NS_ENSURE_TRUE(iid, NS_ERROR_UNEXPECTED);
AutoFree iidGuard(iid); // Free iid upon destruction.
nsCOMPtr<nsIXPConnectJSObjectHolder> wrapper;
jsval v;
nsresult rv = nsContentUtils::WrapNative(cx, ::JS_GetGlobalObject(cx),
data, iid, &v,
getter_AddRefs(wrapper));
NS_ENSURE_SUCCESS(rv, rv);
*aArgv = v;
break;
}
case nsISupportsPrimitive::TYPE_ID :
case nsISupportsPrimitive::TYPE_PRUINT64 :
case nsISupportsPrimitive::TYPE_PRINT64 :
case nsISupportsPrimitive::TYPE_PRTIME :
case nsISupportsPrimitive::TYPE_VOID : {
NS_WARNING("Unsupported primitive type used");
*aArgv = JSVAL_NULL;
break;
}
default : {
NS_WARNING("Unknown primitive type used");
*aArgv = JSVAL_NULL;
break;
}
}
return NS_OK;
}
static JSPropertySpec OptionsProperties[] = {
{"strict", (int8)JSOPTION_STRICT, JSPROP_ENUMERATE | JSPROP_PERMANENT},
{"werror", (int8)JSOPTION_WERROR, JSPROP_ENUMERATE | JSPROP_PERMANENT},
{"relimit", (int8)JSOPTION_RELIMIT, JSPROP_ENUMERATE | JSPROP_PERMANENT},
{0}
};
static JSBool
GetOptionsProperty(JSContext *cx, JSObject *obj, jsid id, jsval *vp)
{
if (JSID_IS_INT(id)) {
uint32 optbit = (uint32) JSID_TO_INT(id);
if (((optbit & (optbit - 1)) == 0 && optbit <= JSOPTION_WERROR) ||
optbit == JSOPTION_RELIMIT)
*vp = (JS_GetOptions(cx) & optbit) ? JSVAL_TRUE : JSVAL_FALSE;
}
return JS_TRUE;
}
static JSBool
SetOptionsProperty(JSContext *cx, JSObject *obj, jsid id, jsval *vp)
{
if (JSID_IS_INT(id)) {
uint32 optbit = (uint32) JSID_TO_INT(id);
// Don't let options other than strict, werror, or relimit be set -- it
// would be bad if web page script could clear
// JSOPTION_PRIVATE_IS_NSISUPPORTS!
if (((optbit & (optbit - 1)) == 0 && optbit <= JSOPTION_WERROR) ||
optbit == JSOPTION_RELIMIT) {
JSBool optval;
JS_ValueToBoolean(cx, *vp, &optval);
uint32 optset = ::JS_GetOptions(cx);
if (optval)
optset |= optbit;
else
optset &= ~optbit;
::JS_SetOptions(cx, optset);
}
}
return JS_TRUE;
}
static JSClass OptionsClass = {
"JSOptions",
0,
JS_PropertyStub, JS_PropertyStub, GetOptionsProperty, SetOptionsProperty,
JS_EnumerateStub, JS_ResolveStub, JS_ConvertStub, nsnull
};
#ifdef NS_TRACE_MALLOC
#include <errno.h> // XXX assume Linux if NS_TRACE_MALLOC
#include <fcntl.h>
#ifdef XP_UNIX
#include <unistd.h>
#endif
#ifdef XP_WIN32
#include <io.h>
#endif
#include "nsTraceMalloc.h"
static JSBool
CheckUniversalXPConnectForTraceMalloc(JSContext *cx)
{
PRBool hasCap = PR_FALSE;
nsresult rv = nsContentUtils::GetSecurityManager()->
IsCapabilityEnabled("UniversalXPConnect", &hasCap);
if (NS_SUCCEEDED(rv) && hasCap)
return JS_TRUE;
JS_ReportError(cx, "trace-malloc functions require UniversalXPConnect");
return JS_FALSE;
}
static JSBool
TraceMallocDisable(JSContext *cx, uintN argc, jsval *vp)
{
if (!CheckUniversalXPConnectForTraceMalloc(cx))
return JS_FALSE;
NS_TraceMallocDisable();
JS_SET_RVAL(cx, vp, JSVAL_VOID);
return JS_TRUE;
}
static JSBool
TraceMallocEnable(JSContext *cx, uintN argc, jsval *vp)
{
if (!CheckUniversalXPConnectForTraceMalloc(cx))
return JS_FALSE;
NS_TraceMallocEnable();
JS_SET_RVAL(cx, vp, JSVAL_VOID);
return JS_TRUE;
}
static JSBool
TraceMallocOpenLogFile(JSContext *cx, uintN argc, jsval *vp)
{
int fd;
JSString *str;
if (!CheckUniversalXPConnectForTraceMalloc(cx))
return JS_FALSE;
if (argc == 0) {
fd = -1;
} else {
str = JS_ValueToString(cx, JS_ARGV(cx, vp)[0]);
if (!str)
return JS_FALSE;
JSAutoByteString filename(cx, str);
if (!filename)
return JS_FALSE;
fd = open(filename.ptr(), O_CREAT | O_WRONLY | O_TRUNC, 0644);
if (fd < 0) {
JS_ReportError(cx, "can't open %s: %s", filename.ptr(), strerror(errno));
return JS_FALSE;
}
}
JS_SET_RVAL(cx, vp, INT_TO_JSVAL(fd));
return JS_TRUE;
}
static JSBool
TraceMallocChangeLogFD(JSContext *cx, uintN argc, jsval *vp)
{
int32 fd, oldfd;
if (!CheckUniversalXPConnectForTraceMalloc(cx))
return JS_FALSE;
if (argc == 0) {
oldfd = -1;
} else {
if (!JS_ValueToECMAInt32(cx, JS_ARGV(cx, vp)[0], &fd))
return JS_FALSE;
oldfd = NS_TraceMallocChangeLogFD(fd);
if (oldfd == -2) {
JS_ReportOutOfMemory(cx);
return JS_FALSE;
}
}
JS_SET_RVAL(cx, vp, INT_TO_JSVAL(oldfd));
return JS_TRUE;
}
static JSBool
TraceMallocCloseLogFD(JSContext *cx, uintN argc, jsval *vp)
{
int32 fd;
if (!CheckUniversalXPConnectForTraceMalloc(cx))
return JS_FALSE;
JS_SET_RVAL(cx, vp, JSVAL_VOID);
if (argc == 0)
return JS_TRUE;
if (!JS_ValueToECMAInt32(cx, JS_ARGV(cx, vp)[0], &fd))
return JS_FALSE;
NS_TraceMallocCloseLogFD((int) fd);
return JS_TRUE;
}
static JSBool
TraceMallocLogTimestamp(JSContext *cx, uintN argc, jsval *vp)
{
if (!CheckUniversalXPConnectForTraceMalloc(cx))
return JS_FALSE;
JSString *str = JS_ValueToString(cx, argc ? JS_ARGV(cx, vp)[0] : JSVAL_VOID);
if (!str)
return JS_FALSE;
JSAutoByteString caption(cx, str);
if (!caption)
return JS_FALSE;
NS_TraceMallocLogTimestamp(caption.ptr());
JS_SET_RVAL(cx, vp, JSVAL_VOID);
return JS_TRUE;
}
static JSBool
TraceMallocDumpAllocations(JSContext *cx, uintN argc, jsval *vp)
{
if (!CheckUniversalXPConnectForTraceMalloc(cx))
return JS_FALSE;
JSString *str = JS_ValueToString(cx, argc ? JS_ARGV(cx, vp)[0] : JSVAL_VOID);
if (!str)
return JS_FALSE;
JSAutoByteString pathname(cx, str);
if (!pathname)
return JS_FALSE;
if (NS_TraceMallocDumpAllocations(pathname.ptr()) < 0) {
JS_ReportError(cx, "can't dump to %s: %s", pathname.ptr(), strerror(errno));
return JS_FALSE;
}
JS_SET_RVAL(cx, vp, JSVAL_VOID);
return JS_TRUE;
}
static JSFunctionSpec TraceMallocFunctions[] = {
{"TraceMallocDisable", TraceMallocDisable, 0, 0},
{"TraceMallocEnable", TraceMallocEnable, 0, 0},
{"TraceMallocOpenLogFile", TraceMallocOpenLogFile, 1, 0},
{"TraceMallocChangeLogFD", TraceMallocChangeLogFD, 1, 0},
{"TraceMallocCloseLogFD", TraceMallocCloseLogFD, 1, 0},
{"TraceMallocLogTimestamp", TraceMallocLogTimestamp, 1, 0},
{"TraceMallocDumpAllocations", TraceMallocDumpAllocations, 1, 0},
{nsnull, nsnull, 0, 0}
};
#endif /* NS_TRACE_MALLOC */
#ifdef MOZ_JPROF
#include <signal.h>
inline PRBool
IsJProfAction(struct sigaction *action)
{
return (action->sa_sigaction &&
action->sa_flags == (SA_RESTART | SA_SIGINFO));
}
void NS_JProfStartProfiling();
void NS_JProfStopProfiling();
static JSBool
JProfStartProfilingJS(JSContext *cx, uintN argc, jsval *vp)
{
NS_JProfStartProfiling();
return JS_TRUE;
}
void NS_JProfStartProfiling()
{
// Figure out whether we're dealing with SIGPROF, SIGALRM, or
// SIGPOLL profiling (SIGALRM for JP_REALTIME, SIGPOLL for
// JP_RTC_HZ)
struct sigaction action;
sigaction(SIGALRM, nsnull, &action);
if (IsJProfAction(&action)) {
printf("Beginning real-time jprof profiling.\n");
raise(SIGALRM);
return;
}
sigaction(SIGPROF, nsnull, &action);
if (IsJProfAction(&action)) {
printf("Beginning process-time jprof profiling.\n");
raise(SIGPROF);
return;
}
sigaction(SIGPOLL, nsnull, &action);
if (IsJProfAction(&action)) {
printf("Beginning rtc-based jprof profiling.\n");
raise(SIGPOLL);
return;
}
printf("Could not start jprof-profiling since JPROF_FLAGS was not set.\n");
}
static JSBool
JProfStopProfilingJS(JSContext *cx, uintN argc, jsval *vp)
{
NS_JProfStopProfiling();
return JS_TRUE;
}
void
NS_JProfStopProfiling()
{
raise(SIGUSR1);
printf("Stopped jprof profiling.\n");
}
static JSFunctionSpec JProfFunctions[] = {
{"JProfStartProfiling", JProfStartProfilingJS, 0, 0},
{"JProfStopProfiling", JProfStopProfilingJS, 0, 0},
{nsnull, nsnull, 0, 0}
};
#endif /* defined(MOZ_JPROF) */
#ifdef MOZ_CALLGRIND
static JSFunctionSpec CallgrindFunctions[] = {
{"startCallgrind", js_StartCallgrind, 0, 0},
{"stopCallgrind", js_StopCallgrind, 0, 0},
{"dumpCallgrind", js_DumpCallgrind, 1, 0},
{nsnull, nsnull, 0, 0}
};
#endif
#ifdef MOZ_VTUNE
static JSFunctionSpec VtuneFunctions[] = {
{"startVtune", js_StartVtune, 1, 0},
{"stopVtune", js_StopVtune, 0, 0},
{"pauseVtune", js_PauseVtune, 0, 0},
{"resumeVtune", js_ResumeVtune, 0, 0},
{nsnull, nsnull, 0, 0}
};
#endif
#ifdef MOZ_TRACEVIS
static JSFunctionSpec EthogramFunctions[] = {
{"initEthogram", js_InitEthogram, 0, 0},
{"shutdownEthogram", js_ShutdownEthogram, 0, 0},
{nsnull, nsnull, 0, 0}
};
#endif
nsresult
nsJSContext::InitClasses(void *aGlobalObj)
{
nsresult rv = NS_OK;
JSObject *globalObj = static_cast<JSObject *>(aGlobalObj);
rv = InitializeExternalClasses();
NS_ENSURE_SUCCESS(rv, rv);
JSAutoRequest ar(mContext);
// Initialize the options object and set default options in mContext
JSObject *optionsObj = ::JS_DefineObject(mContext, globalObj, "_options",
&OptionsClass, nsnull, 0);
if (optionsObj &&
::JS_DefineProperties(mContext, optionsObj, OptionsProperties)) {
::JS_SetOptions(mContext, mDefaultJSOptions);
} else {
rv = NS_ERROR_FAILURE;
}
// Attempt to initialize profiling functions
::JS_DefineProfilingFunctions(mContext, globalObj);
#ifdef NS_TRACE_MALLOC
// Attempt to initialize TraceMalloc functions
::JS_DefineFunctions(mContext, globalObj, TraceMallocFunctions);
#endif
#ifdef MOZ_JPROF
// Attempt to initialize JProf functions
::JS_DefineFunctions(mContext, globalObj, JProfFunctions);
#endif
#ifdef MOZ_CALLGRIND
// Attempt to initialize Callgrind functions
::JS_DefineFunctions(mContext, globalObj, CallgrindFunctions);
#endif
#ifdef MOZ_VTUNE
// Attempt to initialize Vtune functions
::JS_DefineFunctions(mContext, globalObj, VtuneFunctions);
#endif
#ifdef MOZ_TRACEVIS
// Attempt to initialize Ethogram functions
::JS_DefineFunctions(mContext, globalObj, EthogramFunctions);
#endif
JSOptionChangedCallback(js_options_dot_str, this);
return rv;
}
void
nsJSContext::ClearScope(void *aGlobalObj, PRBool aClearFromProtoChain)
{
// Push our JSContext on our thread's context stack.
nsCOMPtr<nsIJSContextStack> stack =
do_GetService("@mozilla.org/js/xpc/ContextStack;1");
if (stack && NS_FAILED(stack->Push(mContext))) {
stack = nsnull;
}
if (aGlobalObj) {
JSObject *obj = (JSObject *)aGlobalObj;
JSAutoRequest ar(mContext);
JSAutoEnterCompartment ac;
ac.enterAndIgnoreErrors(mContext, obj);
// Grab a reference to the window property, which is the outer
// window, so that we can re-define it once we've cleared
// scope. This is what keeps the outer window alive in cases where
// nothing else does.
jsval window;
if (!JS_GetProperty(mContext, obj, "window", &window)) {
window = JSVAL_VOID;
JS_ClearPendingException(mContext);
}
JS_ClearScope(mContext, obj);
if (xpc::WrapperFactory::IsXrayWrapper(obj)) {
JS_ClearScope(mContext, &obj->getProxyExtra().toObject());
}
if (window != JSVAL_VOID) {
if (!JS_DefineProperty(mContext, obj, "window", window,
JS_PropertyStub, JS_PropertyStub,
JSPROP_ENUMERATE | JSPROP_READONLY |
JSPROP_PERMANENT)) {
JS_ClearPendingException(mContext);
}
}
if (!obj->getParent()) {
JS_ClearRegExpStatics(mContext, obj);
}
// Always clear watchpoints, to deal with two cases:
// 1. The first document for this window is loading, and a miscreant has
// preset watchpoints on the window object in order to attack the new
// document's privileged information.
// 2. A document loaded and used watchpoints on its own window, leaving
// them set until the next document loads. We must clean up window
// watchpoints here.
// Watchpoints set on document and subordinate objects are all cleared
// when those sub-window objects are finalized, after JS_ClearScope and
// a GC run that finds them to be garbage.
::JS_ClearWatchPointsForObject(mContext, obj);
// Since the prototype chain is shared between inner and outer (and
// stays with the inner), we don't clear things from the prototype
// chain when we're clearing an outer window whose current inner we
// still want.
if (aClearFromProtoChain) {
nsWindowSH::InvalidateGlobalScopePolluter(mContext, obj);
// Clear up obj's prototype chain, but not Object.prototype.
for (JSObject *o = ::JS_GetPrototype(mContext, obj), *next;
o && (next = ::JS_GetPrototype(mContext, o)); o = next)
::JS_ClearScope(mContext, o);
}
}
if (stack) {
stack->Pop(nsnull);
}
}
void
nsJSContext::WillInitializeContext()
{
mIsInitialized = PR_FALSE;
}
void
nsJSContext::DidInitializeContext()
{
mIsInitialized = PR_TRUE;
}
PRBool
nsJSContext::IsContextInitialized()
{
return mIsInitialized;
}
void
nsJSContext::FinalizeContext()
{
;
}
void
nsJSContext::GC()
{
FireGCTimer(PR_FALSE);
}
void
nsJSContext::ScriptEvaluated(PRBool aTerminated)
{
if (aTerminated && mTerminations) {
// Make sure to null out mTerminations before doing anything that
// might cause new termination funcs to be added!
nsJSContext::TerminationFuncClosure* start = mTerminations;
mTerminations = nsnull;
for (nsJSContext::TerminationFuncClosure* cur = start;
cur;
cur = cur->mNext) {
(*(cur->mTerminationFunc))(cur->mTerminationFuncArg);
}
delete start;
}
#ifdef JS_GC_ZEAL
if (mContext->runtime->gcZeal >= 2) {
JS_MaybeGC(mContext);
}
#endif
if (aTerminated) {
mOperationCallbackTime = 0;
mModalStateTime = 0;
}
}
nsresult
nsJSContext::SetTerminationFunction(nsScriptTerminationFunc aFunc,
nsISupports* aRef)
{
NS_PRECONDITION(JS_IsRunning(mContext), "should be executing script");
nsJSContext::TerminationFuncClosure* newClosure =
new nsJSContext::TerminationFuncClosure(aFunc, aRef, mTerminations);
if (!newClosure) {
return NS_ERROR_OUT_OF_MEMORY;
}
mTerminations = newClosure;
return NS_OK;
}
PRBool
nsJSContext::GetScriptsEnabled()
{
return mScriptsEnabled;
}
void
nsJSContext::SetScriptsEnabled(PRBool aEnabled, PRBool aFireTimeouts)
{
// eeek - this seems the wrong way around - the global should callback
// into each context, so every language is disabled.
mScriptsEnabled = aEnabled;
nsIScriptGlobalObject *global = GetGlobalObject();
if (global) {
global->SetScriptsEnabled(aEnabled, aFireTimeouts);
}
}
PRBool
nsJSContext::GetProcessingScriptTag()
{
return mProcessingScriptTag;
}
void
nsJSContext::SetProcessingScriptTag(PRBool aFlag)
{
mProcessingScriptTag = aFlag;
}
PRBool
nsJSContext::GetExecutingScript()
{
return JS_IsRunning(mContext) || mExecuteDepth > 0;
}
void
nsJSContext::SetGCOnDestruction(PRBool aGCOnDestruction)
{
mGCOnDestruction = aGCOnDestruction;
}
NS_IMETHODIMP
nsJSContext::ScriptExecuted()
{
ScriptEvaluated(!::JS_IsRunning(mContext));
return NS_OK;
}
//static
void
nsJSContext::CC(nsICycleCollectorListener *aListener)
{
NS_TIME_FUNCTION_MIN(1.0);
++sCCollectCount;
#ifdef DEBUG_smaug
printf("Will run cycle collector (%i), %lldms since previous.\n",
sCCollectCount, (PR_Now() - sPreviousCCTime) / PR_USEC_PER_MSEC);
#endif
sPreviousCCTime = PR_Now();
sDelayedCCollectCount = 0;
sCCSuspectChanges = 0;
// nsCycleCollector_collect() no longer forces a JS garbage collection,
// so we have to do it ourselves here.
if (nsContentUtils::XPConnect()) {
nsContentUtils::XPConnect()->GarbageCollect();
}
sCollectedObjectsCounts = nsCycleCollector_collect(aListener);
sCCSuspectedCount = nsCycleCollector_suspectedCount();
if (nsJSRuntime::sRuntime) {
sSavedGCCount = JS_GetGCParameter(nsJSRuntime::sRuntime, JSGC_NUMBER);
}
#ifdef DEBUG_smaug
printf("Collected %u objects, %u suspected objects, took %lldms\n",
sCollectedObjectsCounts, sCCSuspectedCount,
(PR_Now() - sPreviousCCTime) / PR_USEC_PER_MSEC);
#endif
}
static inline uint32
GetGCRunsSinceLastCC()
{
// To avoid crash if nsJSRuntime is not properly initialized.
// See the bug 474586
if (!nsJSRuntime::sRuntime)
return 0;
// Since JS_GetGCParameter() and sSavedGCCount are unsigned, the following
// gives the correct result even when the GC counter wraps around
// UINT32_MAX since the last call to JS_GetGCParameter().
return JS_GetGCParameter(nsJSRuntime::sRuntime, JSGC_NUMBER) -
sSavedGCCount;
}
//static
PRBool
nsJSContext::MaybeCC(PRBool aHigherProbability)
{
++sDelayedCCollectCount;
// Don't check suspected count if CC will be called anyway.
if (sCCSuspectChanges <= NS_MIN_SUSPECT_CHANGES ||
GetGCRunsSinceLastCC() <= NS_MAX_GC_COUNT) {
#ifdef DEBUG_smaug
PRTime now = PR_Now();
#endif
PRUint32 suspected = nsCycleCollector_suspectedCount();
#ifdef DEBUG_smaug
printf("%u suspected objects (%lldms), sCCSuspectedCount %u\n",
suspected, (PR_Now() - now) / PR_USEC_PER_MSEC,
sCCSuspectedCount);
#endif
// Update only when suspected count has increased.
if (suspected > sCCSuspectedCount) {
sCCSuspectChanges += (suspected - sCCSuspectedCount);
sCCSuspectedCount = suspected;
}
}
#ifdef DEBUG_smaug
printf("sCCSuspectChanges %u, GC runs %u\n",
sCCSuspectChanges, GetGCRunsSinceLastCC());
#endif
// Increase the probability also if the previous call to cycle collector
// collected something.
if (aHigherProbability ||
sCollectedObjectsCounts > NS_COLLECTED_OBJECTS_LIMIT) {
sDelayedCCollectCount *= NS_PROBABILITY_MULTIPLIER;
} else if (!sUserIsActive && sCCSuspectChanges > NS_MAX_SUSPECT_CHANGES) {
// If user is inactive and there are lots of new suspected objects,
// increase the probability for cycle collection.
sDelayedCCollectCount += (sCCSuspectChanges / NS_MAX_SUSPECT_CHANGES);
}
if (!sGCTimer &&
(sDelayedCCollectCount > NS_MAX_DELAYED_CCOLLECT) &&
((sCCSuspectChanges > NS_MIN_SUSPECT_CHANGES &&
GetGCRunsSinceLastCC() > NS_MAX_GC_COUNT) ||
(sCCSuspectChanges > NS_MAX_SUSPECT_CHANGES))) {
return IntervalCC();
}
return PR_FALSE;
}
//static
void
nsJSContext::CCIfUserInactive()
{
if (sUserIsActive) {
MaybeCC(PR_TRUE);
} else {
IntervalCC();
}
}
//static
void
nsJSContext::MaybeCCIfUserInactive()
{
if (!sUserIsActive) {
MaybeCC(PR_FALSE);
}
}
//static
PRBool
nsJSContext::IntervalCC()
{
if ((PR_Now() - sPreviousCCTime) >=
PRTime(NS_MIN_CC_INTERVAL * PR_USEC_PER_MSEC)) {
nsJSContext::CC(nsnull);
return PR_TRUE;
}
#ifdef DEBUG_smaug
printf("Running CC was delayed because of NS_MIN_CC_INTERVAL.\n");
#endif
return PR_FALSE;
}
// static
void
GCTimerFired(nsITimer *aTimer, void *aClosure)
{
NS_RELEASE(sGCTimer);
if (sPendingLoadCount == 0 || sLoadInProgressGCTimer) {
sLoadInProgressGCTimer = PR_FALSE;
// Reset sPendingLoadCount in case the timer that fired was a
// timer we scheduled due to a normal GC timer firing while
// documents were loading. If this happens we're waiting for a
// document that is taking a long time to load, and we effectively
// ignore the fact that the currently loading documents are still
// loading and move on as if they weren't.
sPendingLoadCount = 0;
nsJSContext::CCIfUserInactive();
} else {
nsJSContext::FireGCTimer(PR_TRUE);
}
sReadyForGC = PR_TRUE;
}
// static
void
nsJSContext::LoadStart()
{
++sPendingLoadCount;
}
// static
void
nsJSContext::LoadEnd()
{
// sPendingLoadCount is not a well managed load counter (and doesn't
// need to be), so make sure we don't make it wrap backwards here.
if (sPendingLoadCount > 0) {
--sPendingLoadCount;
}
if (!sPendingLoadCount && sLoadInProgressGCTimer) {
sGCTimer->Cancel();
NS_RELEASE(sGCTimer);
sLoadInProgressGCTimer = PR_FALSE;
CCIfUserInactive();
}
}
// static
void
nsJSContext::FireGCTimer(PRBool aLoadInProgress)
{
if (sGCTimer) {
// There's already a timer for GC'ing, just return
return;
}
CallCreateInstance("@mozilla.org/timer;1", &sGCTimer);
if (!sGCTimer) {
NS_WARNING("Failed to create timer");
// Reset sLoadInProgressGCTimer since we're not able to fire the
// timer.
sLoadInProgressGCTimer = PR_FALSE;
CCIfUserInactive();
return;
}
static PRBool first = PR_TRUE;
sGCTimer->InitWithFuncCallback(GCTimerFired, nsnull,
first ? NS_FIRST_GC_DELAY :
aLoadInProgress ? NS_LOAD_IN_PROCESS_GC_DELAY :
NS_GC_DELAY,
nsITimer::TYPE_ONE_SHOT);
sLoadInProgressGCTimer = aLoadInProgress;
first = PR_FALSE;
}
static JSBool
DOMGCCallback(JSContext *cx, JSGCStatus status)
{
JSBool result = gOldJSGCCallback ? gOldJSGCCallback(cx, status) : JS_TRUE;
if (status == JSGC_BEGIN && !NS_IsMainThread())
return JS_FALSE;
return result;
}
// Script object mananagement - note duplicate implementation
// in nsJSRuntime below...
nsresult
nsJSContext::HoldScriptObject(void* aScriptObject)
{
NS_ASSERTION(sIsInitialized, "runtime not initialized");
if (! nsJSRuntime::sRuntime) {
NS_NOTREACHED("couldn't add GC root - no runtime");
return NS_ERROR_FAILURE;
}
::JS_LockGCThingRT(nsJSRuntime::sRuntime, aScriptObject);
return NS_OK;
}
nsresult
nsJSContext::DropScriptObject(void* aScriptObject)
{
NS_ASSERTION(sIsInitialized, "runtime not initialized");
if (! nsJSRuntime::sRuntime) {
NS_NOTREACHED("couldn't remove GC root");
return NS_ERROR_FAILURE;
}
::JS_UnlockGCThingRT(nsJSRuntime::sRuntime, aScriptObject);
return NS_OK;
}
void
nsJSContext::ReportPendingException()
{
// set aside the frame chain, since it has nothing to do with the
// exception we're reporting.
if (mIsInitialized && ::JS_IsExceptionPending(mContext)) {
JSStackFrame* frame = JS_SaveFrameChain(mContext);
::JS_ReportPendingException(mContext);
JS_RestoreFrameChain(mContext, frame);
}
}
/**********************************************************************
* nsJSRuntime implementation
*********************************************************************/
// QueryInterface implementation for nsJSRuntime
NS_INTERFACE_MAP_BEGIN(nsJSRuntime)
NS_INTERFACE_MAP_ENTRY(nsIScriptRuntime)
NS_INTERFACE_MAP_END
NS_IMPL_ADDREF(nsJSRuntime)
NS_IMPL_RELEASE(nsJSRuntime)
nsresult
nsJSRuntime::CreateContext(nsIScriptContext **aContext)
{
nsCOMPtr<nsIScriptContext> scriptContext;
*aContext = new nsJSContext(sRuntime);
NS_ENSURE_TRUE(*aContext, NS_ERROR_OUT_OF_MEMORY);
NS_ADDREF(*aContext);
return NS_OK;
}
nsresult
nsJSRuntime::ParseVersion(const nsString &aVersionStr, PRUint32 *flags)
{
NS_PRECONDITION(flags, "Null flags param?");
JSVersion jsVersion = JSVERSION_UNKNOWN;
if (aVersionStr.Length() != 3 || aVersionStr[0] != '1' || aVersionStr[1] != '.')
jsVersion = JSVERSION_UNKNOWN;
else switch (aVersionStr[2]) {
case '0': jsVersion = JSVERSION_1_0; break;
case '1': jsVersion = JSVERSION_1_1; break;
case '2': jsVersion = JSVERSION_1_2; break;
case '3': jsVersion = JSVERSION_1_3; break;
case '4': jsVersion = JSVERSION_1_4; break;
case '5': jsVersion = JSVERSION_1_5; break;
case '6': jsVersion = JSVERSION_1_6; break;
case '7': jsVersion = JSVERSION_1_7; break;
case '8': jsVersion = JSVERSION_1_8; break;
default: jsVersion = JSVERSION_UNKNOWN;
}
*flags = (PRUint32)jsVersion;
return NS_OK;
}
//static
void
nsJSRuntime::Startup()
{
// initialize all our statics, so that we can restart XPCOM
sDelayedCCollectCount = 0;
sCCollectCount = 0;
sUserIsActive = PR_FALSE;
sPreviousCCTime = PR_Now();
sCollectedObjectsCounts = 0;
sSavedGCCount = 0;
sCCSuspectChanges = 0;
sCCSuspectedCount = 0;
sGCTimer = nsnull;
sReadyForGC = PR_FALSE;
sLoadInProgressGCTimer = PR_FALSE;
sPendingLoadCount = 0;
gNameSpaceManager = nsnull;
sRuntimeService = nsnull;
sRuntime = nsnull;
gOldJSGCCallback = nsnull;
sIsInitialized = PR_FALSE;
sDidShutdown = PR_FALSE;
sContextCount = 0;
sSecurityManager = nsnull;
}
static int
MaxScriptRunTimePrefChangedCallback(const char *aPrefName, void *aClosure)
{
// Default limit on script run time to 10 seconds. 0 means let
// scripts run forever.
PRBool isChromePref =
strcmp(aPrefName, "dom.max_chrome_script_run_time") == 0;
PRInt32 time = nsContentUtils::GetIntPref(aPrefName, isChromePref ? 20 : 10);
PRTime t;
if (time <= 0) {
// Let scripts run for a really, really long time.
t = LL_INIT(0x40000000, 0);
} else {
t = time * PR_USEC_PER_SEC;
}
if (isChromePref) {
sMaxChromeScriptRunTime = t;
} else {
sMaxScriptRunTime = t;
}
return 0;
}
static int
ReportAllJSExceptionsPrefChangedCallback(const char* aPrefName, void* aClosure)
{
PRBool reportAll = nsContentUtils::GetBoolPref(aPrefName, PR_FALSE);
nsContentUtils::XPConnect()->SetReportAllJSExceptions(reportAll);
return 0;
}
static int
SetMemoryHighWaterMarkPrefChangedCallback(const char* aPrefName, void* aClosure)
{
PRInt32 highwatermark = nsContentUtils::GetIntPref(aPrefName, 128);
JS_SetGCParameter(nsJSRuntime::sRuntime, JSGC_MAX_MALLOC_BYTES,
highwatermark * 1024L * 1024L);
return 0;
}
static int
SetMemoryMaxPrefChangedCallback(const char* aPrefName, void* aClosure)
{
PRInt32 pref = nsContentUtils::GetIntPref(aPrefName, -1);
// handle overflow and negative pref values
PRUint32 max = (pref <= 0 || pref >= 0x1000) ? -1 : (PRUint32)pref * 1024 * 1024;
JS_SetGCParameter(nsJSRuntime::sRuntime, JSGC_MAX_BYTES, max);
return 0;
}
static int
SetMemoryGCFrequencyPrefChangedCallback(const char* aPrefName, void* aClosure)
{
PRInt32 triggerFactor = nsContentUtils::GetIntPref(aPrefName, 300);
JS_SetGCParameter(nsJSRuntime::sRuntime, JSGC_TRIGGER_FACTOR, triggerFactor);
return 0;
}
static int
SetMemoryGCModePrefChangedCallback(const char* aPrefName, void* aClosure)
{
PRBool enableCompartmentGC = nsContentUtils::GetBoolPref(aPrefName);
JS_SetGCParameter(nsJSRuntime::sRuntime, JSGC_MODE, enableCompartmentGC
? JSGC_MODE_COMPARTMENT
: JSGC_MODE_GLOBAL);
return 0;
}
static JSPrincipals *
ObjectPrincipalFinder(JSContext *cx, JSObject *obj)
{
if (!sSecurityManager)
return nsnull;
nsCOMPtr<nsIPrincipal> principal;
nsresult rv =
sSecurityManager->GetObjectPrincipal(cx, obj,
getter_AddRefs(principal));
if (NS_FAILED(rv) || !principal) {
return nsnull;
}
JSPrincipals *jsPrincipals = nsnull;
principal->GetJSPrincipals(cx, &jsPrincipals);
// nsIPrincipal::GetJSPrincipals() returns a strong reference to the
// JS principals, but the caller of this function expects a weak
// reference. So we need to release here.
JSPRINCIPALS_DROP(cx, jsPrincipals);
return jsPrincipals;
}
static JSObject*
DOMReadStructuredClone(JSContext* cx,
JSStructuredCloneReader* reader,
uint32 tag,
uint32 data,
void* closure)
{
// We don't currently support any extensions to structured cloning.
nsDOMClassInfo::ThrowJSException(cx, NS_ERROR_DOM_DATA_CLONE_ERR);
return nsnull;
}
static JSBool
DOMWriteStructuredClone(JSContext* cx,
JSStructuredCloneWriter* writer,
JSObject* obj,
void *closure)
{
// We don't currently support any extensions to structured cloning.
nsDOMClassInfo::ThrowJSException(cx, NS_ERROR_DOM_DATA_CLONE_ERR);
return JS_FALSE;
}
static void
DOMStructuredCloneError(JSContext* cx,
uint32 errorid)
{
// We don't currently support any extensions to structured cloning.
nsDOMClassInfo::ThrowJSException(cx, NS_ERROR_DOM_DATA_CLONE_ERR);
}
//static
nsresult
nsJSRuntime::Init()
{
if (sIsInitialized) {
if (!nsContentUtils::XPConnect())
return NS_ERROR_NOT_AVAILABLE;
return NS_OK;
}
nsresult rv = CallGetService(NS_SCRIPTSECURITYMANAGER_CONTRACTID,
&sSecurityManager);
NS_ENSURE_SUCCESS(rv, rv);
rv = CallGetService(kJSRuntimeServiceContractID, &sRuntimeService);
// get the JSRuntime from the runtime svc, if possible
NS_ENSURE_SUCCESS(rv, rv);
rv = sRuntimeService->GetRuntime(&sRuntime);
NS_ENSURE_SUCCESS(rv, rv);
// Let's make sure that our main thread is the same as the xpcom main thread.
NS_ASSERTION(NS_IsMainThread(), "bad");
NS_ASSERTION(!gOldJSGCCallback,
"nsJSRuntime initialized more than once");
sSavedGCCount = JS_GetGCParameter(nsJSRuntime::sRuntime, JSGC_NUMBER);
// Save the old GC callback to chain to it, for GC-observing generality.
gOldJSGCCallback = ::JS_SetGCCallbackRT(sRuntime, DOMGCCallback);
JSSecurityCallbacks *callbacks = JS_GetRuntimeSecurityCallbacks(sRuntime);
NS_ASSERTION(callbacks, "SecMan should have set security callbacks!");
callbacks->findObjectPrincipals = ObjectPrincipalFinder;
// Set up the structured clone callbacks.
static JSStructuredCloneCallbacks cloneCallbacks = {
DOMReadStructuredClone,
DOMWriteStructuredClone,
DOMStructuredCloneError
};
JS_SetStructuredCloneCallbacks(sRuntime, &cloneCallbacks);
// Set these global xpconnect options...
nsContentUtils::RegisterPrefCallback("dom.max_script_run_time",
MaxScriptRunTimePrefChangedCallback,
nsnull);
MaxScriptRunTimePrefChangedCallback("dom.max_script_run_time", nsnull);
nsContentUtils::RegisterPrefCallback("dom.max_chrome_script_run_time",
MaxScriptRunTimePrefChangedCallback,
nsnull);
MaxScriptRunTimePrefChangedCallback("dom.max_chrome_script_run_time",
nsnull);
nsContentUtils::RegisterPrefCallback("dom.report_all_js_exceptions",
ReportAllJSExceptionsPrefChangedCallback,
nsnull);
ReportAllJSExceptionsPrefChangedCallback("dom.report_all_js_exceptions",
nsnull);
nsContentUtils::RegisterPrefCallback("javascript.options.mem.high_water_mark",
SetMemoryHighWaterMarkPrefChangedCallback,
nsnull);
SetMemoryHighWaterMarkPrefChangedCallback("javascript.options.mem.high_water_mark",
nsnull);
nsContentUtils::RegisterPrefCallback("javascript.options.mem.max",
SetMemoryMaxPrefChangedCallback,
nsnull);
SetMemoryMaxPrefChangedCallback("javascript.options.mem.max",
nsnull);
nsContentUtils::RegisterPrefCallback("javascript.options.mem.gc_frequency",
SetMemoryGCFrequencyPrefChangedCallback,
nsnull);
SetMemoryGCFrequencyPrefChangedCallback("javascript.options.mem.gc_frequency",
nsnull);
nsContentUtils::RegisterPrefCallback("javascript.options.mem.gc_per_compartment",
SetMemoryGCModePrefChangedCallback,
nsnull);
SetMemoryGCModePrefChangedCallback("javascript.options.mem.gc_per_compartment",
nsnull);
nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
if (!obs)
return NS_ERROR_FAILURE;
nsIObserver* activityObserver = new nsUserActivityObserver();
NS_ENSURE_TRUE(activityObserver, NS_ERROR_OUT_OF_MEMORY);
obs->AddObserver(activityObserver, "user-interaction-inactive", PR_FALSE);
obs->AddObserver(activityObserver, "user-interaction-active", PR_FALSE);
obs->AddObserver(activityObserver, "xpcom-shutdown", PR_FALSE);
nsIObserver* ccMemPressureObserver = new nsCCMemoryPressureObserver();
NS_ENSURE_TRUE(ccMemPressureObserver, NS_ERROR_OUT_OF_MEMORY);
obs->AddObserver(ccMemPressureObserver, "memory-pressure", PR_FALSE);
sIsInitialized = PR_TRUE;
return NS_OK;
}
//static
nsScriptNameSpaceManager*
nsJSRuntime::GetNameSpaceManager()
{
if (sDidShutdown)
return nsnull;
if (!gNameSpaceManager) {
gNameSpaceManager = new nsScriptNameSpaceManager;
NS_ADDREF(gNameSpaceManager);
nsresult rv = gNameSpaceManager->Init();
NS_ENSURE_SUCCESS(rv, nsnull);
}
return gNameSpaceManager;
}
/* static */
void
nsJSRuntime::Shutdown()
{
if (sGCTimer) {
// We're being shut down, if we have a GC timer scheduled, cancel
// it. The DOM factory will do one final GC once it's shut down.
sGCTimer->Cancel();
NS_RELEASE(sGCTimer);
sLoadInProgressGCTimer = PR_FALSE;
}
NS_IF_RELEASE(gNameSpaceManager);
if (!sContextCount) {
// We're being shutdown, and there are no more contexts
// alive, release the JS runtime service and the security manager.
if (sRuntimeService && sSecurityManager) {
JSSecurityCallbacks *callbacks = JS_GetRuntimeSecurityCallbacks(sRuntime);
if (callbacks) {
NS_ASSERTION(callbacks->findObjectPrincipals == ObjectPrincipalFinder,
"Fighting over the findObjectPrincipals callback!");
callbacks->findObjectPrincipals = NULL;
}
}
NS_IF_RELEASE(sRuntimeService);
NS_IF_RELEASE(sSecurityManager);
}
sDidShutdown = PR_TRUE;
}
// Script object mananagement - note duplicate implementation
// in nsJSContext above...
nsresult
nsJSRuntime::HoldScriptObject(void* aScriptObject)
{
NS_ASSERTION(sIsInitialized, "runtime not initialized");
if (! sRuntime) {
NS_NOTREACHED("couldn't remove GC root - no runtime");
return NS_ERROR_FAILURE;
}
::JS_LockGCThingRT(sRuntime, aScriptObject);
return NS_OK;
}
nsresult
nsJSRuntime::DropScriptObject(void* aScriptObject)
{
NS_ASSERTION(sIsInitialized, "runtime not initialized");
if (! sRuntime) {
NS_NOTREACHED("couldn't remove GC root");
return NS_ERROR_FAILURE;
}
::JS_UnlockGCThingRT(sRuntime, aScriptObject);
return NS_OK;
}
// A factory for the runtime.
nsresult NS_CreateJSRuntime(nsIScriptRuntime **aRuntime)
{
nsresult rv = nsJSRuntime::Init();
NS_ENSURE_SUCCESS(rv, rv);
*aRuntime = new nsJSRuntime();
if (*aRuntime == nsnull)
return NS_ERROR_OUT_OF_MEMORY;
NS_IF_ADDREF(*aRuntime);
return NS_OK;
}
// A fast-array class for JS. This class supports both nsIJSScriptArray and
// nsIArray. If it is JS itself providing and consuming this class, all work
// can be done via nsIJSScriptArray, and avoid the conversion of elements
// to/from nsISupports.
// When consumed by non-JS (eg, another script language), conversion is done
// on-the-fly.
class nsJSArgArray : public nsIJSArgArray, public nsIArray {
public:
nsJSArgArray(JSContext *aContext, PRUint32 argc, jsval *argv, nsresult *prv);
~nsJSArgArray();
// nsISupports
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_AMBIGUOUS(nsJSArgArray,
nsIJSArgArray)
// nsIArray
NS_DECL_NSIARRAY
// nsIJSArgArray
nsresult GetArgs(PRUint32 *argc, void **argv);
void ReleaseJSObjects();
protected:
JSContext *mContext;
jsval *mArgv;
PRUint32 mArgc;
};
nsJSArgArray::nsJSArgArray(JSContext *aContext, PRUint32 argc, jsval *argv,
nsresult *prv) :
mContext(aContext),
mArgv(nsnull),
mArgc(argc)
{
// copy the array - we don't know its lifetime, and ours is tied to xpcom
// refcounting. Alloc zero'd array so cleanup etc is safe.
if (argc) {
mArgv = (jsval *) PR_CALLOC(argc * sizeof(jsval));
if (!mArgv) {
*prv = NS_ERROR_OUT_OF_MEMORY;
return;
}
}
// Callers are allowed to pass in a null argv even for argc > 0. They can
// then use GetArgs to initialize the values.
if (argv) {
for (PRUint32 i = 0; i < argc; ++i)
mArgv[i] = argv[i];
}
*prv = argc > 0 ? NS_HOLD_JS_OBJECTS(this, nsJSArgArray) : NS_OK;
}
nsJSArgArray::~nsJSArgArray()
{
ReleaseJSObjects();
}
void
nsJSArgArray::ReleaseJSObjects()
{
if (mArgc > 0)
NS_DROP_JS_OBJECTS(this, nsJSArgArray);
if (mArgv) {
PR_DELETE(mArgv);
}
mArgc = 0;
}
// QueryInterface implementation for nsJSArgArray
NS_IMPL_CYCLE_COLLECTION_CLASS(nsJSArgArray)
NS_IMPL_CYCLE_COLLECTION_ROOT_BEGIN(nsJSArgArray)
tmp->ReleaseJSObjects();
NS_IMPL_CYCLE_COLLECTION_ROOT_END
NS_IMPL_CYCLE_COLLECTION_UNLINK_0(nsJSArgArray)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsJSArgArray)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(nsJSArgArray)
jsval *argv = tmp->mArgv;
if (argv) {
jsval *end;
for (end = argv + tmp->mArgc; argv < end; ++argv) {
if (JSVAL_IS_GCTHING(*argv))
NS_IMPL_CYCLE_COLLECTION_TRACE_CALLBACK(JAVASCRIPT,
JSVAL_TO_GCTHING(*argv))
}
}
NS_IMPL_CYCLE_COLLECTION_TRACE_END
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsJSArgArray)
NS_INTERFACE_MAP_ENTRY(nsIArray)
NS_INTERFACE_MAP_ENTRY(nsIJSArgArray)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIJSArgArray)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF_AMBIGUOUS(nsJSArgArray, nsIJSArgArray)
NS_IMPL_CYCLE_COLLECTING_RELEASE_AMBIGUOUS(nsJSArgArray, nsIJSArgArray)
nsresult
nsJSArgArray::GetArgs(PRUint32 *argc, void **argv)
{
if (!mArgv) {
NS_WARNING("nsJSArgArray has no argv!");
return NS_ERROR_UNEXPECTED;
}
*argv = (void *)mArgv;
*argc = mArgc;
return NS_OK;
}
// nsIArray impl
NS_IMETHODIMP nsJSArgArray::GetLength(PRUint32 *aLength)
{
*aLength = mArgc;
return NS_OK;
}
/* void queryElementAt (in unsigned long index, in nsIIDRef uuid, [iid_is (uuid), retval] out nsQIResult result); */
NS_IMETHODIMP nsJSArgArray::QueryElementAt(PRUint32 index, const nsIID & uuid, void * *result)
{
*result = nsnull;
if (index >= mArgc)
return NS_ERROR_INVALID_ARG;
if (uuid.Equals(NS_GET_IID(nsIVariant)) || uuid.Equals(NS_GET_IID(nsISupports))) {
return nsContentUtils::XPConnect()->JSToVariant(mContext, mArgv[index],
(nsIVariant **)result);
}
NS_WARNING("nsJSArgArray only handles nsIVariant");
return NS_ERROR_NO_INTERFACE;
}
/* unsigned long indexOf (in unsigned long startIndex, in nsISupports element); */
NS_IMETHODIMP nsJSArgArray::IndexOf(PRUint32 startIndex, nsISupports *element, PRUint32 *_retval)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
/* nsISimpleEnumerator enumerate (); */
NS_IMETHODIMP nsJSArgArray::Enumerate(nsISimpleEnumerator **_retval)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
// The factory function
nsresult NS_CreateJSArgv(JSContext *aContext, PRUint32 argc, void *argv,
nsIArray **aArray)
{
nsresult rv;
nsJSArgArray *ret = new nsJSArgArray(aContext, argc,
static_cast<jsval *>(argv), &rv);
if (ret == nsnull)
return NS_ERROR_OUT_OF_MEMORY;
if (NS_FAILED(rv)) {
delete ret;
return rv;
}
return ret->QueryInterface(NS_GET_IID(nsIArray), (void **)aArray);
}
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