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gecko/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 "nsJSEnvironment.h"
#include "nsIScriptGlobalObject.h"
#include "nsIScriptObjectPrincipal.h"
#include "nsIDOMChromeWindow.h"
#include "nsPIDOMWindow.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 "xpcpublic.h"
#include "jsdbgapi.h" // for JS_ClearWatchPointsForObject
#include "jswrapper.h"
#include "jsxdrapi.h"
#include "nsIArray.h"
#include "nsIObjectInputStream.h"
#include "nsIObjectOutputStream.h"
#include "nsDOMScriptObjectHolder.h"
#include "prmem.h"
#include "WrapperFactory.h"
#include "nsGlobalWindow.h"
#include "nsScriptNameSpaceManager.h"
#include "nsJSPrincipals.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"
#include "mozilla/Preferences.h"
#include "mozilla/Telemetry.h"
#include "sampler.h"
using namespace mozilla;
const size_t gStackSize = 8192;
#ifdef PR_LOGGING
static PRLogModuleInfo* gJSDiagnostics;
#endif
// Thank you Microsoft!
#ifdef CompareString
#undef CompareString
#endif
// 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 4000 // ms
#define NS_SHRINK_GC_BUFFERS_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
// Maximum amount of time that should elapse between incremental GC slices
#define NS_INTERSLICE_GC_DELAY 100 // ms
// The amount of time we wait between a request to CC (after GC ran)
// and doing the actual CC.
#define NS_CC_DELAY 6000 // ms
#define NS_CC_SKIPPABLE_DELAY 400 // ms
// Force a CC after this long if there's anything in the purple buffer.
#define NS_CC_FORCED (2 * 60 * PR_USEC_PER_SEC) // 2 min
// Don't allow an incremental GC to lock out the CC for too long.
#define NS_MAX_CC_LOCKEDOUT_TIME (5 * PR_USEC_PER_SEC) // 5 seconds
// Trigger a CC if the purple buffer exceeds this size when we check it.
#define NS_CC_PURPLE_LIMIT 250
#define JAVASCRIPT nsIProgrammingLanguage::JAVASCRIPT
// if you add statics here, add them to the list in nsJSRuntime::Startup
static nsITimer *sGCTimer;
static nsITimer *sShrinkGCBuffersTimer;
static nsITimer *sCCTimer;
static PRTime sLastCCEndTime;
static bool sCCLockedOut;
static PRTime sCCLockedOutTime;
static js::GCSliceCallback sPrevGCSliceCallback;
// 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;
static bool sLoadingInProgress;
static PRUint32 sCCollectedWaitingForGC;
static bool sPostGCEventsToConsole;
static PRUint32 sCCTimerFireCount = 0;
static PRUint32 sMinForgetSkippableTime = PR_UINT32_MAX;
static PRUint32 sMaxForgetSkippableTime = 0;
static PRUint32 sTotalForgetSkippableTime = 0;
static PRUint32 sRemovedPurples = 0;
static PRUint32 sForgetSkippableBeforeCC = 0;
static PRUint32 sPreviousSuspectedCount = 0;
static bool sCleanupSinceLastGC = true;
static bool sNeedsFullCC = false;
nsScriptNameSpaceManager *gNameSpaceManager;
static nsIJSRuntimeService *sRuntimeService;
JSRuntime *nsJSRuntime::sRuntime;
static const char kJSRuntimeServiceContractID[] =
"@mozilla.org/js/xpc/RuntimeService;1";
static PRTime sFirstCollectionTime;
static bool sIsInitialized;
static bool sDidShutdown;
static PRInt32 sContextCount;
static PRTime sMaxScriptRunTime;
static PRTime sMaxChromeScriptRunTime;
static nsIScriptSecurityManager *sSecurityManager;
// nsMemoryPressureObserver observes the memory-pressure notifications
// and forces a garbage collection and cycle collection when it happens, if
// the appropriate pref is set.
static bool sGCOnMemoryPressure;
class nsMemoryPressureObserver : public nsIObserver
{
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIOBSERVER
};
NS_IMPL_ISUPPORTS1(nsMemoryPressureObserver, nsIObserver)
NS_IMETHODIMP
nsMemoryPressureObserver::Observe(nsISupports* aSubject, const char* aTopic,
const PRUnichar* aData)
{
if (sGCOnMemoryPressure) {
nsJSContext::GarbageCollectNow(js::gcreason::MEM_PRESSURE, nsGCShrinking);
nsJSContext::CycleCollectNow();
}
return NS_OK;
}
class nsRootedJSValueArray {
public:
explicit nsRootedJSValueArray(JSContext *cx) : avr(cx, vals.Length(), vals.Elements()) {}
bool SetCapacity(JSContext *cx, size_t capacity) {
bool ok = vals.SetCapacity(capacity);
if (!ok)
return false;
// Values must be safe for the GC to inspect (they must not contain garbage).
memset(vals.Elements(), 0, vals.Capacity() * sizeof(jsval));
resetRooter(cx);
return true;
}
jsval *Elements() {
return vals.Elements();
}
private:
void resetRooter(JSContext *cx) {
avr.changeArray(vals.Elements(), vals.Length());
}
nsAutoTArray<jsval, 16> vals;
JS::AutoArrayRooter avr;
};
/****************************************************************
************************** AutoFree ****************************
****************************************************************/
class AutoFree {
public:
AutoFree(void *aPtr) : mPtr(aPtr) {
}
~AutoFree() {
if (mPtr)
nsMemory::Free(mPtr);
}
void Invalidate() {
mPtr = 0;
}
private:
void *mPtr;
};
// 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!
bool
NS_HandleScriptError(nsIScriptGlobalObject *aScriptGlobal,
nsScriptErrorEvent *aErrorEvent,
nsEventStatus *aStatus)
{
bool called = 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 = true;
}
--errorDepth;
}
return called;
}
class ScriptErrorEvent : public nsRunnable
{
public:
ScriptErrorEvent(nsIScriptGlobalObject* aScriptGlobal,
nsIPrincipal* aScriptOriginPrincipal,
PRUint32 aLineNr, PRUint32 aColumn, PRUint32 aFlags,
const nsAString& aErrorMsg,
const nsAString& aFileName,
const nsAString& aSourceLine,
bool aDispatchEvent,
PRUint64 aInnerWindowID)
: mScriptGlobal(aScriptGlobal), mOriginPrincipal(aScriptOriginPrincipal),
mLineNr(aLineNr), mColumn(aColumn),
mFlags(aFlags), mErrorMsg(aErrorMsg), mFileName(aFileName),
mSourceLine(aSourceLine), mDispatchEvent(aDispatchEvent),
mInnerWindowID(aInnerWindowID)
{}
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 = true; // Recursion prevention
nsRefPtr<nsPresContext> presContext;
docShell->GetPresContext(getter_AddRefs(presContext));
if (presContext) {
nsScriptErrorEvent errorevent(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);
bool sameOrigin = !mOriginPrincipal;
if (p && !sameOrigin) {
if (NS_FAILED(p->Subsumes(mOriginPrincipal, &sameOrigin))) {
sameOrigin = 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;
}
nsEventDispatcher::Dispatch(win, presContext, &errorevent, nsnull,
&status);
}
sHandlingScriptError = 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";
rv = errorObject->InitWithWindowID(mErrorMsg.get(), mFileName.get(),
mSourceLine.get(),
mLineNr, mColumn, mFlags,
category, mInnerWindowID);
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;
nsCOMPtr<nsIPrincipal> mOriginPrincipal;
PRUint32 mLineNr;
PRUint32 mColumn;
PRUint32 mFlags;
nsString mErrorMsg;
nsString mFileName;
nsString mSourceLine;
bool mDispatchEvent;
PRUint64 mInnerWindowID;
static bool sHandlingScriptError;
};
bool ScriptErrorEvent::sHandlingScriptError = 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(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 innerWindowID = 0;
if (win) {
nsCOMPtr<nsPIDOMWindow> innerWin = win->GetCurrentInnerWindow();
if (innerWin) {
innerWindowID = innerWin->WindowID();
}
}
nsContentUtils::AddScriptRunner(
new ScriptErrorEvent(globalObject,
nsJSPrincipals::get(report->originPrincipals),
report->lineno,
report->uctokenptr - report->uclinebuf,
report->flags, msg, fileName, sourceLine,
report->errorNumber != JSMSG_OUT_OF_MEMORY,
innerWindowID));
}
}
#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;
// 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);
bool isTrackingChromeCodeTime =
global && xpc::AccessCheck::isChrome(js::GetObjectCompartment(global));
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_FALSE);
// Check if we should offer the option to debug
JSStackFrame* fp = ::JS_GetScriptedCaller(cx, NULL);
bool debugPossible = fp && js::CanCallContextDebugHandler(cx);
#ifdef MOZ_JSDEBUGGER
// Get the debugger service if necessary.
if (debugPossible) {
bool jsds_IsOn = 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,
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
bool neverShowDlgChk = 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) {
Preferences::SetInt(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 (js::CallContextDebugHandler(cx, script, JS_GetFramePC(cx, fp), &rval)) {
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";
static const char js_zeal_frequency_str[] = JS_OPTIONS_DOT_STR "gczeal.frequency";
static const char js_zeal_compartment_str[] = JS_OPTIONS_DOT_STR "gczeal.compartment_gc";
#endif
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_methodjit_always_str[] = JS_OPTIONS_DOT_STR "methodjit_always";
static const char js_typeinfer_str[] = JS_OPTIONS_DOT_STR "typeinference";
static const char js_pccounts_content_str[] = JS_OPTIONS_DOT_STR "pccounts.content";
static const char js_pccounts_chrome_str[] = JS_OPTIONS_DOT_STR "pccounts.chrome";
static const char js_jit_hardening_str[] = JS_OPTIONS_DOT_STR "jit_hardening";
static const char js_memlog_option_str[] = JS_OPTIONS_DOT_STR "mem.log";
int
nsJSContext::JSOptionChangedCallback(const char *pref, void *data)
{
nsJSContext *context = reinterpret_cast<nsJSContext *>(data);
PRUint32 oldDefaultJSOptions = context->mDefaultJSOptions;
PRUint32 newDefaultJSOptions = oldDefaultJSOptions;
sPostGCEventsToConsole = Preferences::GetBool(js_memlog_option_str);
bool strict = Preferences::GetBool(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));
bool useMethodJIT = Preferences::GetBool(chromeWindow ?
js_methodjit_chrome_str :
js_methodjit_content_str);
bool usePCCounts = Preferences::GetBool(chromeWindow ?
js_pccounts_chrome_str :
js_pccounts_content_str);
bool useMethodJITAlways = Preferences::GetBool(js_methodjit_always_str);
bool useTypeInference = !chromeWindow && Preferences::GetBool(js_typeinfer_str);
bool useHardening = Preferences::GetBool(js_jit_hardening_str);
nsCOMPtr<nsIXULRuntime> xr = do_GetService(XULRUNTIME_SERVICE_CONTRACTID);
if (xr) {
bool safeMode = false;
xr->GetInSafeMode(&safeMode);
if (safeMode) {
useMethodJIT = false;
usePCCounts = false;
useTypeInference = false;
useMethodJITAlways = true;
useHardening = false;
}
}
if (useMethodJIT)
newDefaultJSOptions |= JSOPTION_METHODJIT;
else
newDefaultJSOptions &= ~JSOPTION_METHODJIT;
if (usePCCounts)
newDefaultJSOptions |= JSOPTION_PCCOUNT;
else
newDefaultJSOptions &= ~JSOPTION_PCCOUNT;
if (useMethodJITAlways)
newDefaultJSOptions |= JSOPTION_METHODJIT_ALWAYS;
else
newDefaultJSOptions &= ~JSOPTION_METHODJIT_ALWAYS;
if (useTypeInference)
newDefaultJSOptions |= JSOPTION_TYPE_INFERENCE;
else
newDefaultJSOptions &= ~JSOPTION_TYPE_INFERENCE;
#ifdef DEBUG
// In debug builds, warnings are enabled in chrome context if
// javascript.options.strict.debug is true
bool strictDebug = Preferences::GetBool(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
bool werror = Preferences::GetBool(js_werror_option_str);
if (werror)
newDefaultJSOptions |= JSOPTION_WERROR;
else
newDefaultJSOptions &= ~JSOPTION_WERROR;
bool relimit = Preferences::GetBool(js_relimit_option_str);
if (relimit)
newDefaultJSOptions |= JSOPTION_RELIMIT;
else
newDefaultJSOptions &= ~JSOPTION_RELIMIT;
::JS_SetOptions(context->mContext, newDefaultJSOptions & JSRUNOPTION_MASK);
// Save the new defaults for the next page load (InitContext).
context->mDefaultJSOptions = newDefaultJSOptions;
JSRuntime *rt = JS_GetRuntime(context->mContext);
JS_SetJitHardening(rt, useHardening);
#ifdef JS_GC_ZEAL
PRInt32 zeal = Preferences::GetInt(js_zeal_option_str, -1);
PRInt32 frequency = Preferences::GetInt(js_zeal_frequency_str, JS_DEFAULT_ZEAL_FREQ);
bool compartment = Preferences::GetBool(js_zeal_compartment_str, false);
if (zeal >= 0)
::JS_SetGCZeal(context->mContext, (PRUint8)zeal, frequency, compartment);
#endif
return 0;
}
nsJSContext::nsJSContext(JSRuntime *aRuntime)
: mGCOnDestruction(true),
mExecuteDepth(0)
{
++sContextCount;
mDefaultJSOptions = JSOPTION_PRIVATE_IS_NSISUPPORTS;
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
Preferences::RegisterCallback(JSOptionChangedCallback,
js_options_dot_str, this);
::JS_SetOperationCallback(mContext, DOMOperationCallback);
xpc_LocalizeContext(mContext);
}
mIsInitialized = false;
mTerminations = nsnull;
mScriptsEnabled = true;
mOperationCallbackTime = 0;
mModalStateTime = 0;
mModalStateDepth = 0;
mProcessingScriptTag = false;
}
nsJSContext::~nsJSContext()
{
#ifdef DEBUG
nsCycleCollector_DEBUG_wasFreed(static_cast<nsIScriptContext*>(this));
#endif
// We may still have pending termination functions if the context is destroyed
// before they could be executed. In this case, free the references to their
// parameters, but don't execute the functions (see bug 622326).
delete mTerminations;
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.
Preferences::UnregisterCallback(JSOptionChangedCallback,
js_options_dot_str, this);
if (mGCOnDestruction) {
PokeGC(js::gcreason::NSJSCONTEXT_DESTROY);
}
// Let xpconnect destroy the JSContext when it thinks the time is right.
nsIXPConnect *xpc = nsContentUtils::XPConnect();
if (xpc) {
xpc->ReleaseJSContext(mContext, true);
} else {
::JS_DestroyContextNoGC(mContext);
}
mContext = nsnull;
}
// QueryInterface implementation for nsJSContext
NS_IMPL_CYCLE_COLLECTION_CLASS(nsJSContext)
NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(nsJSContext)
NS_IMPL_CYCLE_COLLECTION_TRACE_END
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsJSContext)
NS_ASSERTION(!tmp->mContext || js::GetContextOutstandingRequests(tmp->mContext) == 0,
"Trying to unlink a context with outstanding requests.");
tmp->mIsInitialized = false;
tmp->mGCOnDestruction = false;
tmp->DestroyJSContext();
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(nsJSContext)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsJSContext)
nsrefcnt
nsJSContext::GetCCRefcnt()
{
nsrefcnt refcnt = mRefCnt.get();
if (NS_LIKELY(mContext))
refcnt += js::GetContextOutstandingRequests(mContext);
return refcnt;
}
nsresult
nsJSContext::EvaluateStringWithValue(const nsAString& aScript,
JSObject* aScopeObject,
nsIPrincipal *aPrincipal,
const char *aURL,
PRUint32 aLineNo,
PRUint32 aVersion,
JS::Value* aRetValue,
bool* aIsUndefined)
{
NS_TIME_FUNCTION_MIN_FMT(1.0, "%s (line %d) (url: %s, line: %d)", MOZ_FUNCTION_NAME,
__LINE__, aURL, aLineNo);
SAMPLE_LABEL("JS", "EvaluateStringWithValue");
NS_ABORT_IF_FALSE(aScopeObject,
"Shouldn't call EvaluateStringWithValue with null scope object.");
NS_ENSURE_TRUE(mIsInitialized, NS_ERROR_NOT_INITIALIZED);
if (!mScriptsEnabled) {
if (aIsUndefined) {
*aIsUndefined = true;
}
return NS_OK;
}
// 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.
nsCOMPtr<nsIPrincipal> principal = aPrincipal;
nsresult rv;
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;
}
bool ok = false;
rv = sSecurityManager->CanExecuteScripts(mContext, principal, &ok);
if (NS_FAILED(rv)) {
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))) {
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, aScopeObject)) {
stack->Pop(nsnull);
return NS_ERROR_FAILURE;
}
++mExecuteDepth;
ok = ::JS_EvaluateUCScriptForPrincipalsVersion(mContext,
aScopeObject,
nsJSPrincipals::get(principal),
static_cast<const 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();
}
}
// If all went well, convert val to a string (XXXbe unless undefined?).
if (ok) {
if (aIsUndefined) {
*aIsUndefined = JSVAL_IS_VOID(val);
}
*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 = 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(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,
bool *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 = 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,
JSObject* aScopeObject,
nsIPrincipal *aPrincipal,
nsIPrincipal *aOriginPrincipal,
const char *aURL,
PRUint32 aLineNo,
PRUint32 aVersion,
nsAString *aRetValue,
bool* aIsUndefined)
{
NS_TIME_FUNCTION_MIN_FMT(1.0, "%s (line %d) (url: %s, line: %d)", MOZ_FUNCTION_NAME,
__LINE__, aURL, aLineNo);
SAMPLE_LABEL("JS", "EvaluateString");
NS_ENSURE_TRUE(mIsInitialized, NS_ERROR_NOT_INITIALIZED);
if (!mScriptsEnabled) {
if (aIsUndefined) {
*aIsUndefined = true;
}
if (aRetValue) {
aRetValue->Truncate();
}
return NS_OK;
}
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.
nsCOMPtr<nsIPrincipal> principal = aPrincipal;
if (!aPrincipal) {
nsCOMPtr<nsIScriptObjectPrincipal> objPrincipal =
do_QueryInterface(GetGlobalObject());
if (!objPrincipal)
return NS_ERROR_FAILURE;
principal = objPrincipal->GetPrincipal();
if (!principal)
return NS_ERROR_FAILURE;
}
bool ok = false;
nsresult rv = sSecurityManager->CanExecuteScripts(mContext, principal, &ok);
if (NS_FAILED(rv)) {
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))) {
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, aScopeObject)) {
stack->Pop(nsnull);
return NS_ERROR_FAILURE;
}
ok = JS_EvaluateUCScriptForPrincipalsVersionOrigin(
mContext, aScopeObject,
nsJSPrincipals::get(principal), nsJSPrincipals::get(aOriginPrincipal),
static_cast<const 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();
}
}
// If all went well, convert val to a string if one is wanted.
if (ok) {
JSAutoRequest ar(mContext);
JSAutoEnterCompartment ac;
if (!ac.enter(mContext, aScopeObject)) {
stack->Pop(nsnull);
}
rv = JSValueToAString(mContext, val, aRetValue, aIsUndefined);
}
else {
if (aIsUndefined) {
*aIsUndefined = 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(true);
return rv;
}
nsresult
nsJSContext::CompileScript(const PRUnichar* aText,
PRInt32 aTextLength,
nsIPrincipal *aPrincipal,
const char *aURL,
PRUint32 aLineNo,
PRUint32 aVersion,
nsScriptObjectHolder<JSScript>& aScriptObject)
{
NS_ENSURE_TRUE(mIsInitialized, NS_ERROR_NOT_INITIALIZED);
NS_ENSURE_ARG_POINTER(aPrincipal);
JSObject* scopeObject = ::JS_GetGlobalObject(mContext);
bool ok = false;
nsresult rv = sSecurityManager->CanExecuteScripts(mContext, aPrincipal, &ok);
if (NS_FAILED(rv)) {
return NS_ERROR_FAILURE;
}
aScriptObject.drop(); // ensure old object not used on failure...
// Don't compile if SecurityManager said "not ok" or 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)
return NS_OK;
JSAutoRequest ar(mContext);
JSScript* script =
::JS_CompileUCScriptForPrincipalsVersion(mContext,
scopeObject,
nsJSPrincipals::get(aPrincipal),
static_cast<const jschar*>(aText),
aTextLength,
aURL,
aLineNo,
JSVersion(aVersion));
if (!script) {
return NS_ERROR_OUT_OF_MEMORY;
}
NS_ASSERTION(aScriptObject.getScriptTypeID()==JAVASCRIPT,
"Expecting JS script object holder");
return aScriptObject.set(script);
}
nsresult
nsJSContext::ExecuteScript(JSScript* aScriptObject,
JSObject* aScopeObject,
nsAString* aRetValue,
bool* aIsUndefined)
{
NS_ENSURE_TRUE(mIsInitialized, NS_ERROR_NOT_INITIALIZED);
if (!mScriptsEnabled) {
if (aIsUndefined) {
*aIsUndefined = true;
}
if (aRetValue) {
aRetValue->Truncate();
}
return NS_OK;
}
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.
nsresult rv;
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;
}
nsCOMPtr<nsIPrincipal> principal;
rv = sSecurityManager->GetObjectPrincipal(mContext,
JS_GetGlobalFromScript(aScriptObject),
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;
// 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;
bool ok = JS_ExecuteScript(mContext, aScopeObject, aScriptObject, &val);
if (ok) {
// If all went well, convert val to a string (XXXbe unless undefined?).
rv = JSValueToAString(mContext, val, aRetValue, aIsUndefined);
} else {
ReportPendingException();
if (aIsUndefined) {
*aIsUndefined = 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(true);
return rv;
}
#ifdef DEBUG
bool
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 false;
}
return true;
}
#endif
// Helper function to find the JSObject associated with a (presumably DOM)
// interface.
nsresult
nsJSContext::JSObjectFromInterface(nsISupports* aTarget, JSObject* 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.
jsval v;
nsresult rv = nsContentUtils::WrapNative(mContext, 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<JSObject>& 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(handler);
}
// XXX - note that CompileFunction doesn't yet play the nsScriptObjectHolder
// game - caller must still ensure JS GC root.
nsresult
nsJSContext::CompileFunction(JSObject* aTarget,
const nsACString& aName,
PRUint32 aArgCount,
const char** aArgArray,
const nsAString& aBody,
const char* aURL,
PRUint32 aLineNo,
PRUint32 aVersion,
bool aShared,
JSObject** 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_ABORT_IF_FALSE(aFunctionObject,
"Shouldn't call CompileFunction with null return value.");
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;
}
nsIScriptGlobalObject *global = GetGlobalObject();
nsCOMPtr<nsIPrincipal> principal;
if (global) {
// XXXbe why the two-step QI? speed up via a new GetGlobalObjectData func?
nsCOMPtr<nsIScriptObjectPrincipal> globalData = do_QueryInterface(global);
if (globalData) {
principal = globalData->GetPrincipal();
if (!principal)
return NS_ERROR_FAILURE;
}
}
JSObject *target = aTarget;
JSAutoRequest ar(mContext);
JSFunction* fun =
::JS_CompileUCFunctionForPrincipalsVersion(mContext,
aShared ? nsnull : target,
nsJSPrincipals::get(principal),
PromiseFlatCString(aName).get(),
aArgCount, aArgArray,
static_cast<const jschar*>(PromiseFlatString(aBody).get()),
aBody.Length(),
aURL, aLineNo,
JSVersion(aVersion));
if (!fun)
return NS_ERROR_FAILURE;
*aFunctionObject = JS_GetFunctionObject(fun);
return NS_OK;
}
nsresult
nsJSContext::CallEventHandler(nsISupports* aTarget, JSObject* aScope,
JSObject* aHandler, nsIArray* aargv,
nsIVariant** arv)
{
NS_ENSURE_TRUE(mIsInitialized, NS_ERROR_NOT_INITIALIZED);
if (!mScriptsEnabled) {
return NS_OK;
}
#ifdef NS_FUNCTION_TIMER
{
JSObject *obj = aHandler;
if (js::IsFunctionProxy(obj))
obj = js::UnwrapObject(obj);
JSString *id = JS_GetFunctionId(static_cast<JSFunction *>(JS_GetPrivate(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
SAMPLE_LABEL("JS", "CallEventHandler");
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, 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;
JSObject *funobj = 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;
js::ForceFrame ff(mContext, funobj);
if (!ac.enter(mContext, funobj) || !ff.enter() ||
!JS_WrapObject(mContext, &target)) {
ReportPendingException();
sSecurityManager->PopContextPrincipal(mContext);
return NS_ERROR_FAILURE;
}
Maybe<nsRootedJSValueArray> tempStorage;
// 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, tempStorage);
NS_ENSURE_SUCCESS(rv, rv);
++mExecuteDepth;
bool ok = ::JS_CallFunctionValue(mContext, target,
funval, argc, argv, &rval);
--mExecuteDepth;
if (!ok) {
// Don't pass back results from failed calls.
rval = JSVAL_VOID;
// Tell the caller that the handler threw an error.
rv = NS_ERROR_FAILURE;
} else if (rval == JSVAL_NULL) {
*arv = nsnull;
} else if (!JS_WrapValue(mContext, &rval)) {
rv = NS_ERROR_FAILURE;
} else {
rv = nsContentUtils::XPConnect()->JSToVariant(mContext, rval, arv);
}
// Tell XPConnect about any pending exceptions. This is needed
// to avoid dropping JS exceptions in case we got here through
// nested calls through XPConnect.
if (NS_FAILED(rv))
ReportPendingException();
sSecurityManager->PopContextPrincipal(mContext);
}
pusher.Pop();
// ScriptEvaluated needs to come after we pop the stack
ScriptEvaluated(true);
return rv;
}
nsresult
nsJSContext::BindCompiledEventHandler(nsISupports* aTarget, JSObject* aScope,
JSObject* aHandler,
nsScriptObjectHolder<JSObject>& aBoundHandler)
{
NS_ENSURE_ARG(aHandler);
NS_ENSURE_TRUE(mIsInitialized, NS_ERROR_NOT_INITIALIZED);
NS_PRECONDITION(!aBoundHandler, "Shouldn't already have a bound handler!");
JSAutoRequest ar(mContext);
// Get the jsobject associated with this target
JSObject *target = nsnull;
nsresult rv = JSObjectFromInterface(aTarget, aScope, &target);
NS_ENSURE_SUCCESS(rv, rv);
#ifdef DEBUG
{
JSAutoEnterCompartment ac;
if (!ac.enter(mContext, aHandler)) {
return NS_ERROR_FAILURE;
}
NS_ASSERTION(JS_TypeOfValue(mContext,
OBJECT_TO_JSVAL(aHandler)) == JSTYPE_FUNCTION,
"Event handler object not a function");
}
#endif
JSAutoEnterCompartment ac;
if (!ac.enter(mContext, target)) {
return NS_ERROR_FAILURE;
}
JSObject* funobj;
// Make sure the handler function is parented by its event target object
if (aHandler) {
funobj = JS_CloneFunctionObject(mContext, aHandler, target);
if (!funobj) {
rv = NS_ERROR_OUT_OF_MEMORY;
}
} else {
funobj = NULL;
}
aBoundHandler.set(funobj);
return rv;
}
// serialization
nsresult
nsJSContext::Serialize(nsIObjectOutputStream* aStream, JSScript* aScriptObject)
{
if (!aScriptObject)
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);
if (! ::JS_XDRScript(xdr, &aScriptObject)) {
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_t 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<JSScript>& aResult)
{
NS_TIME_FUNCTION_MIN(1.0);
PRUint32 size;
nsresult 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);
JSScript *result = nsnull;
if (! xdr) {
rv = NS_ERROR_OUT_OF_MEMORY;
} else {
xdr->userdata = (void*) aStream;
JSAutoRequest ar(cx);
::JS_XDRMemSetData(xdr, data, size);
if (! ::JS_XDRScript(xdr, &result)) {
rv = NS_ERROR_FAILURE; // principals deserialization error?
}
// 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_t 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);
}
nsIScriptGlobalObject *
nsJSContext::GetGlobalObject()
{
JSObject *global = ::JS_GetGlobalObject(mContext);
if (!global) {
return nsnull;
}
if (mGlobalObjectRef)
return mGlobalObjectRef;
#ifdef DEBUG
{
JSObject *inner = JS_ObjectToInnerObject(mContext, global);
// If this assertion hits then it means that we have a window object as
// our global, but we never called CreateOuterObject.
NS_ASSERTION(inner == global, "Shouldn't be able to innerize here");
}
#endif
JSClass *c = JS_GetClass(global);
if (!c || ((~c->flags) & (JSCLASS_HAS_PRIVATE |
JSCLASS_PRIVATE_IS_NSISUPPORTS))) {
return nsnull;
}
nsISupports *priv = (nsISupports *)js::GetObjectPrivate(global);
nsCOMPtr<nsIXPConnectWrappedNative> wrapped_native =
do_QueryInterface(priv);
nsCOMPtr<nsIScriptGlobalObject> sgo;
if (wrapped_native) {
// The global object is a XPConnect wrapped native, the native in
// the wrapper might be the nsIScriptGlobalObject
sgo = do_QueryWrappedNative(wrapped_native);
} else {
sgo = do_QueryInterface(priv);
}
// This'll return a pointer to something we're about to release, but
// that's ok, the JS object will hold it alive long enough.
return sgo;
}
JSObject*
nsJSContext::GetNativeGlobal()
{
return JS_GetGlobalObject(mContext);
}
nsresult
nsJSContext::CreateNativeGlobalForInner(
nsIScriptGlobalObject *aNewInner,
bool aIsChrome,
nsIPrincipal *aPrincipal,
JSObject** aNativeGlobal, nsISupports **aHolder)
{
nsIXPConnect *xpc = nsContentUtils::XPConnect();
PRUint32 flags = aIsChrome? nsIXPConnect::FLAG_SYSTEM_GLOBAL_OBJECT : 0;
nsCOMPtr<nsIPrincipal> systemPrincipal;
if (aIsChrome) {
nsIScriptSecurityManager *ssm = nsContentUtils::GetSecurityManager();
ssm->GetSystemPrincipal(getter_AddRefs(systemPrincipal));
}
nsRefPtr<nsIXPConnectJSObjectHolder> jsholder;
nsresult rv = xpc->
InitClassesWithNewWrappedGlobal(mContext, aNewInner,
aIsChrome ? systemPrincipal.get() : aPrincipal,
flags, getter_AddRefs(jsholder));
if (NS_FAILED(rv)) {
return rv;
}
jsholder->GetJSObject(aNativeGlobal);
jsholder.forget(aHolder);
return NS_OK;
}
nsresult
nsJSContext::ConnectToInner(nsIScriptGlobalObject *aNewInner, JSObject *aOuterGlobal)
{
NS_ENSURE_ARG(aNewInner);
#ifdef DEBUG
JSObject *newInnerJSObject = aNewInner->GetGlobalJSObject();
#endif
// 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, aOuterGlobal);
NS_ASSERTION(JS_GetPrototype(aOuterGlobal) ==
JS_GetPrototype(newInnerJSObject),
"outer and inner globals should have the same prototype");
return NS_OK;
}
JSContext*
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));
if (chromeWindow) {
// 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;
}
js::SetProxyExtra(outer, 0, js::PrivateValue(aGlobalObject));
return SetOuterObject(outer);
}
nsresult
nsJSContext::SetOuterObject(JSObject* aOuterObject)
{
// Force our context's global object to be the outer.
// NB: JS_SetGlobalObject sets mContext->compartment.
JS_SetGlobalObject(mContext, aOuterObject);
// Set up the prototype for the outer object.
JSObject *inner = JS_GetParent(aOuterObject);
JS_SetPrototype(mContext, aOuterObject, JS_GetPrototype(inner));
return NS_OK;
}
nsresult
nsJSContext::InitOuterWindow()
{
JSObject *global = JS_ObjectToInnerObject(mContext, JS_GetGlobalObject(mContext));
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(JSObject* aTarget, const char* aPropName, nsISupports* aArgs)
{
PRUint32 argc;
jsval *argv = nsnull;
JSAutoRequest ar(mContext);
Maybe<nsRootedJSValueArray> tempStorage;
nsresult rv =
ConvertSupportsTojsvals(aArgs, GetNativeGlobal(), &argc, &argv, tempStorage);
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).
return JS_DefineProperty(mContext, aTarget, aPropName, vargs, NULL, NULL, 0)
? NS_OK
: NS_ERROR_FAILURE;
}
nsresult
nsJSContext::ConvertSupportsTojsvals(nsISupports *aArgs,
JSObject *aScope,
PRUint32 *aArgc,
jsval **aArgv,
Maybe<nsRootedJSValueArray> &aTempStorage)
{
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 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
}
// Use the caller's auto guards to release and unroot.
aTempStorage.construct(mContext);
bool ok = aTempStorage.ref().SetCapacity(mContext, argCount);
NS_ENSURE_TRUE(ok, NS_ERROR_OUT_OF_MEMORY);
jsval *argv = aTempStorage.ref().Elements();
if (argsArray) {
for (PRUint32 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, 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, 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, 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);
bool 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;
}
#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)
{
bool hasCap = 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, unsigned 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, unsigned 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, unsigned 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, unsigned argc, jsval *vp)
{
if (!CheckUniversalXPConnectForTraceMalloc(cx))
return JS_FALSE;
int32_t fd, oldfd;
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, unsigned argc, jsval *vp)
{
if (!CheckUniversalXPConnectForTraceMalloc(cx))
return JS_FALSE;
int32_t fd;
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, unsigned 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, unsigned 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 bool
IsJProfAction(struct sigaction *action)
{
return (action->sa_sigaction &&
(action->sa_flags & (SA_RESTART | SA_SIGINFO)) == (SA_RESTART | SA_SIGINFO));
}
void NS_JProfStartProfiling();
void NS_JProfStopProfiling();
void NS_JProfClearCircular();
static JSBool
JProfStartProfilingJS(JSContext *cx, unsigned 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;
// Must check ALRM before PROF since both are enabled for real-time
sigaction(SIGALRM, nsnull, &action);
//printf("SIGALRM: %p, flags = %x\n",action.sa_sigaction,action.sa_flags);
if (IsJProfAction(&action)) {
//printf("Beginning real-time jprof profiling.\n");
raise(SIGALRM);
return;
}
sigaction(SIGPROF, nsnull, &action);
//printf("SIGPROF: %p, flags = %x\n",action.sa_sigaction,action.sa_flags);
if (IsJProfAction(&action)) {
//printf("Beginning process-time jprof profiling.\n");
raise(SIGPROF);
return;
}
sigaction(SIGPOLL, nsnull, &action);
//printf("SIGPOLL: %p, flags = %x\n",action.sa_sigaction,action.sa_flags);
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, unsigned argc, jsval *vp)
{
NS_JProfStopProfiling();
return JS_TRUE;
}
void
NS_JProfStopProfiling()
{
raise(SIGUSR1);
//printf("Stopped jprof profiling.\n");
}
static JSBool
JProfClearCircularJS(JSContext *cx, unsigned argc, jsval *vp)
{
NS_JProfClearCircular();
return JS_TRUE;
}
void
NS_JProfClearCircular()
{
raise(SIGUSR2);
//printf("cleared jprof buffer\n");
}
static JSBool
JProfSaveCircularJS(JSContext *cx, unsigned argc, jsval *vp)
{
// Not ideal...
NS_JProfStopProfiling();
NS_JProfStartProfiling();
return JS_TRUE;
}
static JSFunctionSpec JProfFunctions[] = {
{"JProfStartProfiling", JProfStartProfilingJS, 0, 0},
{"JProfStopProfiling", JProfStopProfilingJS, 0, 0},
{"JProfClearCircular", JProfClearCircularJS, 0, 0},
{"JProfSaveCircular", JProfSaveCircularJS, 0, 0},
{nsnull, nsnull, 0, 0}
};
#endif /* defined(MOZ_JPROF) */
#ifdef MOZ_DMD
// See https://wiki.mozilla.org/Performance/MemShrink/DMD for instructions on
// how to use DMD.
static JSBool
DMDCheckJS(JSContext *cx, unsigned argc, jsval *vp)
{
mozilla::DMDCheckAndDump();
return JS_TRUE;
}
static JSFunctionSpec DMDFunctions[] = {
{"DMD", DMDCheckJS, 0, 0},
{nsnull, nsnull, 0, 0}
};
#endif /* defined(MOZ_DMD) */
nsresult
nsJSContext::InitClasses(JSObject* aGlobalObj)
{
nsresult rv = InitializeExternalClasses();
NS_ENSURE_SUCCESS(rv, rv);
JSAutoRequest ar(mContext);
::JS_SetOptions(mContext, mDefaultJSOptions);
// Attempt to initialize profiling functions
::JS_DefineProfilingFunctions(mContext, aGlobalObj);
#ifdef NS_TRACE_MALLOC
// Attempt to initialize TraceMalloc functions
::JS_DefineFunctions(mContext, aGlobalObj, TraceMallocFunctions);
#endif
#ifdef MOZ_JPROF
// Attempt to initialize JProf functions
::JS_DefineFunctions(mContext, aGlobalObj, JProfFunctions);
#endif
#ifdef MOZ_DMD
// Attempt to initialize DMD functions
::JS_DefineFunctions(mContext, aGlobalObj, DMDFunctions);
#endif
JSOptionChangedCallback(js_options_dot_str, this);
return rv;
}
void
nsJSContext::WillInitializeContext()
{
mIsInitialized = false;
}
void
nsJSContext::DidInitializeContext()
{
mIsInitialized = true;
}
bool
nsJSContext::IsContextInitialized()
{
return mIsInitialized;
}
void
nsJSContext::ScriptEvaluated(bool 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;
}
JS_MaybeGC(mContext);
if (aTerminated) {
mOperationCallbackTime = 0;
mModalStateTime = 0;
}
}
void
nsJSContext::SetTerminationFunction(nsScriptTerminationFunc aFunc,
nsIDOMWindow* aRef)
{
NS_PRECONDITION(GetExecutingScript(), "should be executing script");
nsJSContext::TerminationFuncClosure* newClosure =
new nsJSContext::TerminationFuncClosure(aFunc, aRef, mTerminations);
mTerminations = newClosure;
}
bool
nsJSContext::GetScriptsEnabled()
{
return mScriptsEnabled;
}
void
nsJSContext::SetScriptsEnabled(bool aEnabled, bool 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);
}
}
bool
nsJSContext::GetProcessingScriptTag()
{
return mProcessingScriptTag;
}
void
nsJSContext::SetProcessingScriptTag(bool aFlag)
{
mProcessingScriptTag = aFlag;
}
bool
nsJSContext::GetExecutingScript()
{
return JS_IsRunning(mContext) || mExecuteDepth > 0;
}
void
nsJSContext::SetGCOnDestruction(bool aGCOnDestruction)
{
mGCOnDestruction = aGCOnDestruction;
}
NS_IMETHODIMP
nsJSContext::ScriptExecuted()
{
ScriptEvaluated(!::JS_IsRunning(mContext));
return NS_OK;
}
//static
void
nsJSContext::GarbageCollectNow(js::gcreason::Reason reason, PRUint32 gckind)
{
NS_TIME_FUNCTION_MIN(1.0);
SAMPLE_LABEL("GC", "GarbageCollectNow");
KillGCTimer();
KillShrinkGCBuffersTimer();
// 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;
sLoadingInProgress = false;
if (nsContentUtils::XPConnect()) {
nsContentUtils::XPConnect()->GarbageCollect(reason, gckind);
}
}
//static
void
nsJSContext::ShrinkGCBuffersNow()
{
NS_TIME_FUNCTION_MIN(1.0);
SAMPLE_LABEL("GC", "ShrinkGCBuffersNow");
KillShrinkGCBuffersTimer();
JS_ShrinkGCBuffers(nsJSRuntime::sRuntime);
}
//Static
void
nsJSContext::CycleCollectNow(nsICycleCollectorListener *aListener,
PRInt32 aExtraForgetSkippableCalls)
{
if (!NS_IsMainThread()) {
return;
}
if (sCCLockedOut) {
// We're in the middle of an incremental GC; finish it first
nsJSContext::GarbageCollectNow(js::gcreason::CC_FORCED, nsGCNormal);
}
SAMPLE_LABEL("GC", "CycleCollectNow");
NS_TIME_FUNCTION_MIN(1.0);
KillCCTimer();
PRTime start = PR_Now();
PRUint32 suspected = nsCycleCollector_suspectedCount();
for (PRInt32 i = 0; i < aExtraForgetSkippableCalls; ++i) {
nsCycleCollector_forgetSkippable();
}
// nsCycleCollector_forgetSkippable may mark some gray js to black.
if (!sCleanupSinceLastGC && aExtraForgetSkippableCalls >= 0) {
nsCycleCollector_forgetSkippable();
}
nsCycleCollectorResults ccResults;
nsCycleCollector_collect(&ccResults, aListener);
sCCollectedWaitingForGC += ccResults.mFreedRefCounted + ccResults.mFreedGCed;
// If we collected a substantial amount of cycles, poke the GC since more objects
// might be unreachable now.
if (sCCollectedWaitingForGC > 250) {
PokeGC(js::gcreason::CC_WAITING);
}
PRTime now = PR_Now();
if (sLastCCEndTime) {
PRUint32 timeBetween = (PRUint32)(start - sLastCCEndTime) / PR_USEC_PER_SEC;
Telemetry::Accumulate(Telemetry::CYCLE_COLLECTOR_TIME_BETWEEN, timeBetween);
}
sLastCCEndTime = now;
Telemetry::Accumulate(Telemetry::FORGET_SKIPPABLE_MAX,
sMaxForgetSkippableTime / PR_USEC_PER_MSEC);
if (sPostGCEventsToConsole) {
PRTime delta = 0;
if (sFirstCollectionTime) {
delta = now - sFirstCollectionTime;
} else {
sFirstCollectionTime = now;
}
nsString gcmsg;
if (ccResults.mForcedGC) {
gcmsg.AssignLiteral(", forced a GC");
}
NS_NAMED_MULTILINE_LITERAL_STRING(kFmt,
NS_LL("CC(T+%.1f) duration: %llums, suspected: %lu, visited: %lu RCed and %lu GCed, collected: %lu RCed and %lu GCed (%lu waiting for GC)%s\n")
NS_LL("ForgetSkippable %lu times before CC, min: %lu ms, max: %lu ms, avg: %lu ms, total: %lu ms, removed: %lu"));
nsString msg;
PRUint32 cleanups = sForgetSkippableBeforeCC ? sForgetSkippableBeforeCC : 1;
sMinForgetSkippableTime = (sMinForgetSkippableTime == PR_UINT32_MAX)
? 0 : sMinForgetSkippableTime;
msg.Adopt(nsTextFormatter::smprintf(kFmt.get(), double(delta) / PR_USEC_PER_SEC,
(now - start) / PR_USEC_PER_MSEC, suspected,
ccResults.mVisitedRefCounted, ccResults.mVisitedGCed,
ccResults.mFreedRefCounted, ccResults.mFreedGCed,
sCCollectedWaitingForGC, gcmsg.get(),
sForgetSkippableBeforeCC,
sMinForgetSkippableTime / PR_USEC_PER_MSEC,
sMaxForgetSkippableTime / PR_USEC_PER_MSEC,
(sTotalForgetSkippableTime / cleanups) /
PR_USEC_PER_MSEC,
sTotalForgetSkippableTime / PR_USEC_PER_MSEC,
sRemovedPurples));
nsCOMPtr<nsIConsoleService> cs =
do_GetService(NS_CONSOLESERVICE_CONTRACTID);
if (cs) {
cs->LogStringMessage(msg.get());
}
}
sMinForgetSkippableTime = PR_UINT32_MAX;
sMaxForgetSkippableTime = 0;
sTotalForgetSkippableTime = 0;
sRemovedPurples = 0;
sForgetSkippableBeforeCC = 0;
sCleanupSinceLastGC = true;
sNeedsFullCC = false;
}
// static
void
GCTimerFired(nsITimer *aTimer, void *aClosure)
{
NS_RELEASE(sGCTimer);
uintptr_t reason = reinterpret_cast<uintptr_t>(aClosure);
nsJSContext::GarbageCollectNow(static_cast<js::gcreason::Reason>(reason), nsGCIncremental);
}
void
ShrinkGCBuffersTimerFired(nsITimer *aTimer, void *aClosure)
{
NS_RELEASE(sShrinkGCBuffersTimer);
nsJSContext::ShrinkGCBuffersNow();
}
static bool
ShouldTriggerCC(PRUint32 aSuspected)
{
return sNeedsFullCC ||
aSuspected > NS_CC_PURPLE_LIMIT ||
sLastCCEndTime + NS_CC_FORCED < PR_Now();
}
static void
TimerFireForgetSkippable(PRUint32 aSuspected, bool aRemoveChildless)
{
PRTime startTime = PR_Now();
nsCycleCollector_forgetSkippable(aRemoveChildless);
sPreviousSuspectedCount = nsCycleCollector_suspectedCount();
sCleanupSinceLastGC = true;
PRTime delta = PR_Now() - startTime;
if (sMinForgetSkippableTime > delta) {
sMinForgetSkippableTime = delta;
}
if (sMaxForgetSkippableTime < delta) {
sMaxForgetSkippableTime = delta;
}
sTotalForgetSkippableTime += delta;
sRemovedPurples += (aSuspected - sPreviousSuspectedCount);
++sForgetSkippableBeforeCC;
}
static void
CCTimerFired(nsITimer *aTimer, void *aClosure)
{
if (sDidShutdown) {
return;
}
if (sCCLockedOut) {
PRTime now = PR_Now();
if (sCCLockedOutTime == 0) {
sCCLockedOutTime = now;
return;
}
if (now - sCCLockedOutTime < NS_MAX_CC_LOCKEDOUT_TIME) {
return;
}
// Finish the current incremental GC
nsJSContext::GarbageCollectNow(js::gcreason::CC_FORCED, nsGCNormal);
}
++sCCTimerFireCount;
// During early timer fires, we only run forgetSkippable. During the first
// late timer fire, we decide if we are going to have a second and final
// late timer fire, where we may run the CC.
const PRUint32 numEarlyTimerFires = NS_CC_DELAY / NS_CC_SKIPPABLE_DELAY - 2;
bool isLateTimerFire = sCCTimerFireCount > numEarlyTimerFires;
PRUint32 suspected = nsCycleCollector_suspectedCount();
if (isLateTimerFire && ShouldTriggerCC(suspected)) {
if (sCCTimerFireCount == numEarlyTimerFires + 1) {
TimerFireForgetSkippable(suspected, true);
if (ShouldTriggerCC(nsCycleCollector_suspectedCount())) {
// Our efforts to avoid a CC have failed, so we return to let the
// timer fire once more to trigger a CC.
return;
}
} else {
// We are in the final timer fire and still meet the conditions for
// triggering a CC.
nsJSContext::CycleCollectNow();
}
} else if ((sPreviousSuspectedCount + 100) <= suspected) {
// Only do a forget skippable if there are more than a few new objects.
TimerFireForgetSkippable(suspected, false);
}
if (isLateTimerFire) {
// We have either just run the CC or decided we don't want to run the CC
// next time, so kill the timer.
sPreviousSuspectedCount = 0;
nsJSContext::KillCCTimer();
}
}
// static
bool
nsJSContext::CleanupSinceLastGC()
{
return sCleanupSinceLastGC;
}
// static
void
nsJSContext::LoadStart()
{
sLoadingInProgress = true;
++sPendingLoadCount;
}
// static
void
nsJSContext::LoadEnd()
{
if (!sLoadingInProgress)
return;
// 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;
return;
}
// Its probably a good idea to GC soon since we have finished loading.
sLoadingInProgress = false;
PokeGC(js::gcreason::LOAD_END);
}
// static
void
nsJSContext::PokeGC(js::gcreason::Reason aReason, int aDelay)
{
if (sGCTimer) {
// There's already a timer for GC'ing, just return
return;
}
CallCreateInstance("@mozilla.org/timer;1", &sGCTimer);
if (!sGCTimer) {
// Failed to create timer (probably because we're in XPCOM shutdown)
return;
}
static bool first = true;
sGCTimer->InitWithFuncCallback(GCTimerFired, reinterpret_cast<void *>(aReason),
aDelay
? aDelay
: (first
? NS_FIRST_GC_DELAY
: NS_GC_DELAY),
nsITimer::TYPE_ONE_SHOT);
first = false;
}
// static
void
nsJSContext::PokeShrinkGCBuffers()
{
if (sShrinkGCBuffersTimer) {
return;
}
CallCreateInstance("@mozilla.org/timer;1", &sShrinkGCBuffersTimer);
if (!sShrinkGCBuffersTimer) {
// Failed to create timer (probably because we're in XPCOM shutdown)
return;
}
sShrinkGCBuffersTimer->InitWithFuncCallback(ShrinkGCBuffersTimerFired, nsnull,
NS_SHRINK_GC_BUFFERS_DELAY,
nsITimer::TYPE_ONE_SHOT);
}
// static
void
nsJSContext::MaybePokeCC()
{
if (sCCTimer || sDidShutdown) {
return;
}
if (sNeedsFullCC ||
nsCycleCollector_suspectedCount() > 100 ||
sLastCCEndTime + NS_CC_FORCED < PR_Now()) {
sCCTimerFireCount = 0;
CallCreateInstance("@mozilla.org/timer;1", &sCCTimer);
if (!sCCTimer) {
return;
}
sCCTimer->InitWithFuncCallback(CCTimerFired, nsnull,
NS_CC_SKIPPABLE_DELAY,
nsITimer::TYPE_REPEATING_SLACK);
}
}
//static
void
nsJSContext::KillGCTimer()
{
if (sGCTimer) {
sGCTimer->Cancel();
NS_RELEASE(sGCTimer);
}
}
//static
void
nsJSContext::KillShrinkGCBuffersTimer()
{
if (sShrinkGCBuffersTimer) {
sShrinkGCBuffersTimer->Cancel();
NS_RELEASE(sShrinkGCBuffersTimer);
}
}
//static
void
nsJSContext::KillCCTimer()
{
sCCLockedOutTime = 0;
if (sCCTimer) {
sCCTimer->Cancel();
NS_RELEASE(sCCTimer);
}
}
void
nsJSContext::GC(js::gcreason::Reason aReason)
{
PokeGC(aReason);
}
static void
DOMGCSliceCallback(JSRuntime *aRt, js::GCProgress aProgress, const js::GCDescription &aDesc)
{
NS_ASSERTION(NS_IsMainThread(), "GCs must run on the main thread");
if (aDesc.logMessage && sPostGCEventsToConsole) {
PRTime now = PR_Now();
PRTime delta = 0;
if (sFirstCollectionTime) {
delta = now - sFirstCollectionTime;
} else {
sFirstCollectionTime = now;
}
NS_NAMED_LITERAL_STRING(kFmt, "GC(T+%.1f) %s");
nsString msg;
msg.Adopt(nsTextFormatter::smprintf(kFmt.get(),
double(delta) / PR_USEC_PER_SEC,
aDesc.logMessage));
nsCOMPtr<nsIConsoleService> cs = do_GetService(NS_CONSOLESERVICE_CONTRACTID);
if (cs) {
cs->LogStringMessage(msg.get());
}
}
// Prevent cycle collections and shrinking during incremental GC.
if (aProgress == js::GC_CYCLE_BEGIN) {
sCCLockedOut = true;
nsJSContext::KillShrinkGCBuffersTimer();
} else if (aProgress == js::GC_CYCLE_END) {
sCCLockedOut = false;
}
// The GC has more work to do, so schedule another GC slice.
if (aProgress == js::GC_SLICE_END) {
nsJSContext::KillGCTimer();
nsJSContext::PokeGC(js::gcreason::INTER_SLICE_GC, NS_INTERSLICE_GC_DELAY);
}
if (aProgress == js::GC_CYCLE_END) {
// May need to kill the inter-slice GC timer
nsJSContext::KillGCTimer();
sCCollectedWaitingForGC = 0;
sCleanupSinceLastGC = false;
if (aDesc.isCompartment) {
// If this is a compartment GC, restart it. We still want
// a full GC to happen. Compartment GCs usually happen as a
// result of last-ditch or MaybeGC. In both cases it is
// probably a time of heavy activity and we want to delay
// the full GC, but we do want it to happen eventually.
nsJSContext::PokeGC(js::gcreason::POST_COMPARTMENT);
}
sNeedsFullCC = true;
nsJSContext::MaybePokeCC();
if (!aDesc.isCompartment) {
// Avoid shrinking during heavy activity, which is suggested by
// compartment GC.
nsJSContext::PokeShrinkGCBuffers();
}
}
if (sPrevGCSliceCallback)
(*sPrevGCSliceCallback)(aRt, aProgress, aDesc);
}
// 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)) {
bool saved = ::JS_SaveFrameChain(mContext);
::JS_ReportPendingException(mContext);
if (saved)
::JS_RestoreFrameChain(mContext);
}
}
/**********************************************************************
* 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)
already_AddRefed<nsIScriptContext>
nsJSRuntime::CreateContext()
{
nsCOMPtr<nsIScriptContext> scriptContext = new nsJSContext(sRuntime);
return scriptContext.forget();
}
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
sGCTimer = sCCTimer = nsnull;
sCCLockedOut = false;
sCCLockedOutTime = 0;
sLastCCEndTime = 0;
sPendingLoadCount = 0;
sLoadingInProgress = false;
sCCollectedWaitingForGC = 0;
sPostGCEventsToConsole = false;
sNeedsFullCC = false;
gNameSpaceManager = nsnull;
sRuntimeService = nsnull;
sRuntime = nsnull;
sIsInitialized = false;
sDidShutdown = 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.
bool isChromePref =
strcmp(aPrefName, "dom.max_chrome_script_run_time") == 0;
PRInt32 time = Preferences::GetInt(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)
{
bool reportAll = Preferences::GetBool(aPrefName, false);
nsContentUtils::XPConnect()->SetReportAllJSExceptions(reportAll);
return 0;
}
static int
SetMemoryHighWaterMarkPrefChangedCallback(const char* aPrefName, void* aClosure)
{
PRInt32 highwatermark = Preferences::GetInt(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 = Preferences::GetInt(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
SetMemoryGCModePrefChangedCallback(const char* aPrefName, void* aClosure)
{
PRBool enableCompartmentGC = Preferences::GetBool("javascript.options.mem.gc_per_compartment");
PRBool enableIncrementalGC = Preferences::GetBool("javascript.options.mem.gc_incremental");
JSGCMode mode;
if (enableIncrementalGC) {
mode = JSGC_MODE_INCREMENTAL;
} else if (enableCompartmentGC) {
mode = JSGC_MODE_COMPARTMENT;
} else {
mode = JSGC_MODE_GLOBAL;
}
JS_SetGCParameter(nsJSRuntime::sRuntime, JSGC_MODE, mode);
return 0;
}
static int
SetMemoryGCSliceTimePrefChangedCallback(const char* aPrefName, void* aClosure)
{
PRInt32 pref = Preferences::GetInt(aPrefName, -1);
// handle overflow and negative pref values
if (pref > 0 && pref < 100000)
JS_SetGCParameter(nsJSRuntime::sRuntime, JSGC_SLICE_TIME_BUDGET, pref);
return 0;
}
JSObject*
NS_DOMReadStructuredClone(JSContext* cx,
JSStructuredCloneReader* reader,
uint32_t tag,
uint32_t data,
void* closure)
{
// We don't currently support any extensions to structured cloning.
nsDOMClassInfo::ThrowJSException(cx, NS_ERROR_DOM_DATA_CLONE_ERR);
return nsnull;
}
JSBool
NS_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;
}
void
NS_DOMStructuredCloneError(JSContext* cx,
uint32_t 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");
sPrevGCSliceCallback = js::SetGCSliceCallback(sRuntime, DOMGCSliceCallback);
// Set up the structured clone callbacks.
static JSStructuredCloneCallbacks cloneCallbacks = {
NS_DOMReadStructuredClone,
NS_DOMWriteStructuredClone,
NS_DOMStructuredCloneError
};
JS_SetStructuredCloneCallbacks(sRuntime, &cloneCallbacks);
// Set these global xpconnect options...
Preferences::RegisterCallback(MaxScriptRunTimePrefChangedCallback,
"dom.max_script_run_time");
MaxScriptRunTimePrefChangedCallback("dom.max_script_run_time", nsnull);
Preferences::RegisterCallback(MaxScriptRunTimePrefChangedCallback,
"dom.max_chrome_script_run_time");
MaxScriptRunTimePrefChangedCallback("dom.max_chrome_script_run_time",
nsnull);
Preferences::RegisterCallback(ReportAllJSExceptionsPrefChangedCallback,
"dom.report_all_js_exceptions");
ReportAllJSExceptionsPrefChangedCallback("dom.report_all_js_exceptions",
nsnull);
Preferences::RegisterCallback(SetMemoryHighWaterMarkPrefChangedCallback,
"javascript.options.mem.high_water_mark");
SetMemoryHighWaterMarkPrefChangedCallback("javascript.options.mem.high_water_mark",
nsnull);
Preferences::RegisterCallback(SetMemoryMaxPrefChangedCallback,
"javascript.options.mem.max");
SetMemoryMaxPrefChangedCallback("javascript.options.mem.max",
nsnull);
Preferences::RegisterCallback(SetMemoryGCModePrefChangedCallback,
"javascript.options.mem.gc_per_compartment");
SetMemoryGCModePrefChangedCallback("javascript.options.mem.gc_per_compartment",
nsnull);
Preferences::RegisterCallback(SetMemoryGCModePrefChangedCallback,
"javascript.options.mem.gc_incremental");
SetMemoryGCModePrefChangedCallback("javascript.options.mem.gc_incremental",
nsnull);
Preferences::RegisterCallback(SetMemoryGCSliceTimePrefChangedCallback,
"javascript.options.mem.gc_incremental_slice_ms");
SetMemoryGCSliceTimePrefChangedCallback("javascript.options.mem.gc_incremental_slice_ms",
nsnull);
nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
if (!obs)
return NS_ERROR_FAILURE;
Preferences::AddBoolVarCache(&sGCOnMemoryPressure,
"javascript.options.gc_on_memory_pressure",
true);
nsIObserver* memPressureObserver = new nsMemoryPressureObserver();
NS_ENSURE_TRUE(memPressureObserver, NS_ERROR_OUT_OF_MEMORY);
obs->AddObserver(memPressureObserver, "memory-pressure", false);
sIsInitialized = 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()
{
nsJSContext::KillGCTimer();
nsJSContext::KillShrinkGCBuffersTimer();
nsJSContext::KillCCTimer();
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.
NS_IF_RELEASE(sRuntimeService);
NS_IF_RELEASE(sSecurityManager);
}
sDidShutdown = 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:
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_UNLINK_BEGIN(nsJSArgArray)
tmp->ReleaseJSObjects();
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
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),
"mArgv[i]")
}
}
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(nsJSArgArray)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsJSArgArray)
nsresult
nsJSArgArray::GetArgs(PRUint32 *argc, void **argv)
{
*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,
nsIJSArgArray **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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