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gecko-dev/dom/base/nsJSEnvironment.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsError.h"
#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 "xpcpublic.h"
#include "jsdbgapi.h" // for JS_ClearWatchPointsForObject
#include "jswrapper.h"
#include "nsIArray.h"
#include "nsIObjectInputStream.h"
#include "nsIObjectOutputStream.h"
#include "prmem.h"
#include "WrapperFactory.h"
#include "nsGlobalWindow.h"
#include "nsScriptNameSpaceManager.h"
#include "StructuredCloneTags.h"
#include "mozilla/dom/ImageData.h"
#include "mozilla/dom/ImageDataBinding.h"
#include "nsJSPrincipals.h"
#include "jsdbgapi.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/Preferences.h"
#include "mozilla/Telemetry.h"
#include "mozilla/dom/BindingUtils.h"
#include "mozilla/Attributes.h"
#include "mozilla/dom/CanvasRenderingContext2DBinding.h"
#include "GeckoProfiler.h"
using namespace mozilla;
using namespace mozilla::dom;
const size_t gStackSize = 8192;
#ifdef PR_LOGGING
static PRLogModuleInfo* gJSDiagnostics;
#endif
// Thank you Microsoft!
#ifdef CompareString
#undef CompareString
#endif
#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
#define NS_FULL_GC_DELAY 60000 // ms
#define NS_MAX_COMPARTMENT_GC_COUNT 20
// Maximum amount of time that should elapse between incremental GC slices
#define NS_INTERSLICE_GC_DELAY 100 // ms
// If we haven't painted in 100ms, we allow for a longer GC budget
#define NS_INTERSLICE_GC_BUDGET 40 // 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 more than NS_CC_FORCED_PURPLE_LIMIT
// objects in the purple buffer.
#define NS_CC_FORCED (2 * 60 * PR_USEC_PER_SEC) // 2 min
#define NS_CC_FORCED_PURPLE_LIMIT 10
// Don't allow an incremental GC to lock out the CC for too long.
#define NS_MAX_CC_LOCKEDOUT_TIME (15 * PR_USEC_PER_SEC) // 15 seconds
// Trigger a CC if the purple buffer exceeds this size when we check it.
#define NS_CC_PURPLE_LIMIT 200
#define JAVASCRIPT nsIProgrammingLanguage::JAVASCRIPT
// Large value used to specify that a script should run essentially forever
#define NS_UNLIMITED_SCRIPT_RUNTIME (0x40000000LL << 32)
// if you add statics here, add them to the list in nsJSRuntime::Startup
static nsITimer *sGCTimer;
static nsITimer *sShrinkGCBuffersTimer;
static nsITimer *sCCTimer;
static nsITimer *sFullGCTimer;
static nsITimer *sInterSliceGCTimer;
static PRTime sLastCCEndTime;
static bool sCCLockedOut;
static PRTime sCCLockedOutTime;
static JS::GCSliceCallback sPrevGCSliceCallback;
static js::AnalysisPurgeCallback sPrevAnalysisPurgeCallback;
static bool sHasRunGC;
// 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 uint32_t sPendingLoadCount;
static bool sLoadingInProgress;
static uint32_t sCCollectedWaitingForGC;
static uint32_t sLikelyShortLivingObjectsNeedingGC;
static bool sPostGCEventsToConsole;
static bool sPostGCEventsToObserver;
static bool sDisableExplicitCompartmentGC;
static uint32_t sCCTimerFireCount = 0;
static uint32_t sMinForgetSkippableTime = UINT32_MAX;
static uint32_t sMaxForgetSkippableTime = 0;
static uint32_t sTotalForgetSkippableTime = 0;
static uint32_t sRemovedPurples = 0;
static uint32_t sForgetSkippableBeforeCC = 0;
static uint32_t sPreviousSuspectedCount = 0;
static uint32_t sCompartmentGCCount = NS_MAX_COMPARTMENT_GC_COUNT;
static uint32_t sCleanupsSinceLastGC = UINT32_MAX;
static bool sNeedsFullCC = false;
static nsJSContext *sContextList = nullptr;
static 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 bool sShuttingDown;
static int32_t sContextCount;
static PRTime sMaxScriptRunTime;
static PRTime sMaxChromeScriptRunTime;
static nsIScriptSecurityManager *sSecurityManager;
// nsJSEnvironmentObserver 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;
static PRTime
GetCollectionTimeDelta()
{
PRTime now = PR_Now();
if (sFirstCollectionTime) {
return now - sFirstCollectionTime;
}
sFirstCollectionTime = now;
return 0;
}
static void
KillTimers()
{
nsJSContext::KillGCTimer();
nsJSContext::KillShrinkGCBuffersTimer();
nsJSContext::KillCCTimer();
nsJSContext::KillFullGCTimer();
nsJSContext::KillInterSliceGCTimer();
}
class nsJSEnvironmentObserver MOZ_FINAL : public nsIObserver
{
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIOBSERVER
};
NS_IMPL_ISUPPORTS1(nsJSEnvironmentObserver, nsIObserver)
NS_IMETHODIMP
nsJSEnvironmentObserver::Observe(nsISupports* aSubject, const char* aTopic,
const PRUnichar* aData)
{
if (sGCOnMemoryPressure && !nsCRT::strcmp(aTopic, "memory-pressure")) {
nsJSContext::GarbageCollectNow(JS::gcreason::MEM_PRESSURE,
nsJSContext::NonIncrementalGC,
nsJSContext::NonCompartmentGC,
nsJSContext::ShrinkingGC);
nsJSContext::CycleCollectNow();
} else if (!nsCRT::strcmp(aTopic, "quit-application")) {
sShuttingDown = true;
KillTimers();
}
return NS_OK;
}
class nsRootedJSValueArray {
public:
explicit nsRootedJSValueArray(JSContext *cx) : avr(cx, vals.Length(), vals.Elements()) {}
void SetCapacity(JSContext *cx, size_t capacity) {
vals.SetCapacity(capacity);
// Values must be safe for the GC to inspect (they must not contain garbage).
memset(vals.Elements(), 0, vals.Capacity() * sizeof(jsval));
resetRooter(cx);
}
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() : nullptr;
if (docShell) {
nsRefPtr<nsPresContext> presContext;
docShell->GetPresContext(getter_AddRefs(presContext));
static int32_t errorDepth; // Recursion prevention
++errorDepth;
if (presContext && errorDepth < 2) {
// Dispatch() must be synchronous for the recursion block
// (errorDepth) to work.
nsEventDispatcher::Dispatch(win, presContext, aErrorEvent, nullptr,
aStatus);
called = true;
}
--errorDepth;
}
return called;
}
class ScriptErrorEvent : public nsRunnable
{
public:
ScriptErrorEvent(nsIScriptGlobalObject* aScriptGlobal,
nsIPrincipal* aScriptOriginPrincipal,
uint32_t aLineNr, uint32_t aColumn, uint32_t aFlags,
const nsAString& aErrorMsg,
const nsAString& aFileName,
const nsAString& aSourceLine,
bool aDispatchEvent,
uint64_t 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() : nullptr;
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, nullptr,
&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 != nullptr) {
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, mFileName,
mSourceLine,
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;
uint32_t mLineNr;
uint32_t mColumn;
uint32_t mFlags;
nsString mErrorMsg;
nsString mFileName;
nsString mSourceLine;
bool mDispatchEvent;
uint64_t 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)) {
if (JS_DescribeScriptedCaller(cx, nullptr, nullptr)) {
return;
}
nsIXPConnect* xpc = nsContentUtils::XPConnect();
if (xpc) {
nsAXPCNativeCallContext *cc = nullptr;
xpc->GetCurrentNativeCallContext(&cc);
if (cc) {
nsAXPCNativeCallContext *prev = cc;
while (NS_SUCCEEDED(prev->GetPreviousCallContext(&prev)) && prev) {
uint16_t 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 = static_cast<const PRUnichar*>(report->ucmessage);
if (m) {
const PRUnichar* n = static_cast<const PRUnichar*>
(js::GetErrorTypeName(cx, report->exnType));
if (n) {
msg.Assign(n);
msg.AppendLiteral(": ");
}
msg.Append(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);
uint64_t 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.
nsAutoCString 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 nullptr;
}
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 nullptr;
}
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;
}
nsAutoCString 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;
}
nsAutoCString 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, nullptr);
nsIDocShell *docShell = win->GetDocShell();
NS_ENSURE_TRUE(docShell, nullptr);
nsCOMPtr<nsIInterfaceRequestor> ireq(do_QueryInterface(docShell));
NS_ENSURE_TRUE(ireq, nullptr);
// 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
JSScript *script;
unsigned lineno;
JSBool hasFrame = ::JS_DescribeScriptedCaller(cx, &script, &lineno);
bool debugPossible = hasFrame && 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 != nullptr)) || !jsds_IsOn);
}
#endif
// Get localizable strings
nsXPIDLString title, msg, stopButton, waitButton, debugButton, neverShowDlg;
rv = nsContentUtils::GetLocalizedString(nsContentUtils::eDOM_PROPERTIES,
"KillScriptTitle",
title);
nsresult tmp = nsContentUtils::GetLocalizedString(nsContentUtils::eDOM_PROPERTIES,
"StopScriptButton",
stopButton);
if (NS_FAILED(tmp)) {
rv = tmp;
}
tmp = nsContentUtils::GetLocalizedString(nsContentUtils::eDOM_PROPERTIES,
"WaitForScriptButton",
waitButton);
if (NS_FAILED(tmp)) {
rv = tmp;
}
tmp = nsContentUtils::GetLocalizedString(nsContentUtils::eDOM_PROPERTIES,
"DontAskAgain",
neverShowDlg);
if (NS_FAILED(tmp)) {
rv = tmp;
}
if (debugPossible) {
tmp = nsContentUtils::GetLocalizedString(nsContentUtils::eDOM_PROPERTIES,
"DebugScriptButton",
debugButton);
if (NS_FAILED(tmp)) {
rv = tmp;
}
tmp = nsContentUtils::GetLocalizedString(nsContentUtils::eDOM_PROPERTIES,
"KillScriptWithDebugMessage",
msg);
if (NS_FAILED(tmp)) {
rv = tmp;
}
}
else {
tmp = nsContentUtils::GetLocalizedString(nsContentUtils::eDOM_PROPERTIES,
"KillScriptMessage",
msg);
if (NS_FAILED(tmp)) {
rv = tmp;
}
}
//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
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);
msg.Append(':');
msg.AppendInt(lineno);
}
}
}
int32_t buttonPressed = 0; //In case user exits dialog by clicking X
bool neverShowDlgChk = false;
uint32_t 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, nullptr);
// Open the dialog.
rv = prompt->ConfirmEx(title, msg, buttonFlags, waitButton, stopButton,
debugButton, neverShowDlg, &neverShowDlgChk,
&buttonPressed);
::JS_SetOperationCallback(cx, DOMOperationCallback);
if (NS_SUCCEEDED(rv) && (buttonPressed == 0)) {
// Allow the script to continue running
if (neverShowDlgChk) {
if (isTrackingChromeCodeTime) {
Preferences::SetInt("dom.max_chrome_script_run_time", 0);
sMaxChromeScriptRunTime = NS_UNLIMITED_SCRIPT_RUNTIME;
} else {
Preferences::SetInt("dom.max_script_run_time", 0);
sMaxScriptRunTime = NS_UNLIMITED_SCRIPT_RUNTIME;
}
}
ctx->mOperationCallbackTime = PR_Now();
return JS_TRUE;
}
else if ((buttonPressed == 2) && debugPossible) {
return js_CallContextDebugHandler(cx);
}
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";
#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";
#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";
static const char js_memnotify_option_str[] = JS_OPTIONS_DOT_STR "mem.notify";
static const char js_disable_explicit_compartment_gc[] =
JS_OPTIONS_DOT_STR "mem.disable_explicit_compartment_gc";
static const char js_baselinejit_content_str[] = JS_OPTIONS_DOT_STR "baselinejit.content";
static const char js_baselinejit_chrome_str[] = JS_OPTIONS_DOT_STR "baselinejit.chrome";
static const char js_ion_content_str[] = JS_OPTIONS_DOT_STR "ion.content";
static const char js_asmjs_content_str[] = JS_OPTIONS_DOT_STR "experimental_asmjs";
static const char js_ion_parallel_compilation_str[] = JS_OPTIONS_DOT_STR "ion.parallel_compilation";
int
nsJSContext::JSOptionChangedCallback(const char *pref, void *data)
{
nsJSContext *context = reinterpret_cast<nsJSContext *>(data);
uint32_t oldDefaultJSOptions = context->mDefaultJSOptions;
uint32_t newDefaultJSOptions = oldDefaultJSOptions;
sPostGCEventsToConsole = Preferences::GetBool(js_memlog_option_str);
sPostGCEventsToObserver = Preferences::GetBool(js_memnotify_option_str);
sDisableExplicitCompartmentGC =
Preferences::GetBool(js_disable_explicit_compartment_gc);
bool strict = Preferences::GetBool(js_strict_option_str);
if (strict)
newDefaultJSOptions |= JSOPTION_STRICT;
else
newDefaultJSOptions &= ~JSOPTION_STRICT;
// The vanilla GetGlobalObject returns null if a global isn't set up on
// the context yet. We can sometimes be call midway through context init,
// So ask for the member directly instead.
nsIScriptGlobalObject *global = context->GetGlobalObjectRef();
// 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<nsIDOMWindow> contentWindow(do_QueryInterface(global));
nsCOMPtr<nsIDOMChromeWindow> chromeWindow(do_QueryInterface(global));
bool useMethodJIT = Preferences::GetBool(chromeWindow || !contentWindow ?
js_methodjit_chrome_str :
js_methodjit_content_str);
bool usePCCounts = Preferences::GetBool(chromeWindow || !contentWindow ?
js_pccounts_chrome_str :
js_pccounts_content_str);
bool useMethodJITAlways = Preferences::GetBool(js_methodjit_always_str);
bool useTypeInference = !chromeWindow && contentWindow && Preferences::GetBool(js_typeinfer_str);
bool useHardening = Preferences::GetBool(js_jit_hardening_str);
bool useBaselineJIT = Preferences::GetBool(chromeWindow || !contentWindow ?
js_baselinejit_chrome_str :
js_baselinejit_content_str);
bool useIon = Preferences::GetBool(js_ion_content_str);
bool useAsmJS = Preferences::GetBool(js_asmjs_content_str);
bool parallelIonCompilation = Preferences::GetBool(js_ion_parallel_compilation_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;
useBaselineJIT = false;
useIon = false;
useAsmJS = 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;
if (useBaselineJIT)
newDefaultJSOptions |= JSOPTION_BASELINE;
else
newDefaultJSOptions &= ~JSOPTION_BASELINE;
if (useIon)
newDefaultJSOptions |= JSOPTION_ION;
else
newDefaultJSOptions &= ~JSOPTION_ION;
if (useAsmJS)
newDefaultJSOptions |= JSOPTION_ASMJS;
else
newDefaultJSOptions &= ~JSOPTION_ASMJS;
#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);
if (strictDebug && (newDefaultJSOptions & JSOPTION_STRICT) == 0) {
if (chromeWindow || !contentWindow)
newDefaultJSOptions |= JSOPTION_STRICT;
}
#endif
bool werror = Preferences::GetBool(js_werror_option_str);
if (werror)
newDefaultJSOptions |= JSOPTION_WERROR;
else
newDefaultJSOptions &= ~JSOPTION_WERROR;
::JS_SetOptions(context->mContext, newDefaultJSOptions & JSOPTION_MASK);
::JS_SetParallelCompilationEnabled(context->mContext, parallelIonCompilation);
// 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
int32_t zeal = Preferences::GetInt(js_zeal_option_str, -1);
int32_t frequency = Preferences::GetInt(js_zeal_frequency_str, JS_DEFAULT_ZEAL_FREQ);
if (zeal >= 0)
::JS_SetGCZeal(context->mContext, (uint8_t)zeal, frequency);
#endif
return 0;
}
nsJSContext::nsJSContext(JSRuntime *aRuntime, bool aGCOnDestruction,
nsIScriptGlobalObject* aGlobalObject)
: mActive(false)
, mGCOnDestruction(aGCOnDestruction)
, mExecuteDepth(0)
, mGlobalObjectRef(aGlobalObject)
{
mNext = sContextList;
mPrev = &sContextList;
if (sContextList) {
sContextList->mPrev = &mNext;
}
sContextList = this;
++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);
}
mIsInitialized = false;
mTerminations = nullptr;
mScriptsEnabled = true;
mOperationCallbackTime = 0;
mModalStateTime = 0;
mModalStateDepth = 0;
mProcessingScriptTag = false;
}
nsJSContext::~nsJSContext()
{
*mPrev = mNext;
if (mNext) {
mNext->mPrev = mPrev;
}
// 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 = nullptr;
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, nullptr);
// 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 = nullptr;
}
// QueryInterface implementation for 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::ContextHasOutstandingRequests(tmp->mContext),
"Trying to unlink a context with outstanding requests.");
tmp->mIsInitialized = false;
tmp->mGCOnDestruction = false;
if (tmp->mContext) {
JSAutoRequest ar(tmp->mContext);
JS_SetGlobalObject(tmp->mContext, nullptr);
}
tmp->DestroyJSContext();
NS_IMPL_CYCLE_COLLECTION_UNLINK(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(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();
// In the (abnormal) case of synchronous cycle-collection, the context may be
// actively running JS code in which case we must keep it alive by adding an
// extra refcount.
if (mContext && js::ContextHasOutstandingRequests(mContext)) {
refcnt++;
}
return refcnt;
}
nsresult
nsJSContext::EvaluateString(const nsAString& aScript,
JSObject& aScopeObject,
JS::CompileOptions& aOptions,
bool aCoerceToString,
JS::Value* aRetValue)
{
PROFILER_LABEL("JS", "EvaluateString");
MOZ_ASSERT_IF(aOptions.versionSet, aOptions.version != JSVERSION_UNKNOWN);
MOZ_ASSERT_IF(aCoerceToString, aRetValue);
NS_ENSURE_TRUE(mIsInitialized, NS_ERROR_NOT_INITIALIZED);
// Unfortunately, the JS engine actually compiles scripts with a return value
// in a different, less efficient way. Furthermore, it can't JIT them in many
// cases. So we need to be explicitly told whether the caller cares about the
// return value. Callers use null to indicate they don't care.
if (aRetValue) {
*aRetValue = JSVAL_VOID;
}
if (!mScriptsEnabled) {
return NS_OK;
}
nsCxPusher pusher;
pusher.Push(mContext);
xpc_UnmarkGrayObject(&aScopeObject);
nsAutoMicroTask mt;
JSPrincipals* p = JS_GetCompartmentPrincipals(js::GetObjectCompartment(&aScopeObject));
aOptions.setPrincipals(p);
bool ok = false;
nsresult rv = sSecurityManager->CanExecuteScripts(mContext, nsJSPrincipals::get(p), &ok);
NS_ENSURE_SUCCESS(rv, rv);
NS_ENSURE_TRUE(ok, NS_OK);
nsJSContext::TerminationFuncHolder holder(this);
// Scope the JSAutoCompartment so that it gets destroyed before we pop the
// cx and potentially call JS_RestoreFrameChain.
XPCAutoRequest ar(mContext);
{
JSAutoCompartment ac(mContext, &aScopeObject);
++mExecuteDepth;
JS::RootedObject rootedScope(mContext, &aScopeObject);
ok = JS::Evaluate(mContext, rootedScope, aOptions,
PromiseFlatString(aScript).get(),
aScript.Length(), aRetValue);
if (ok && aCoerceToString && !aRetValue->isUndefined()) {
JSString* str = JS_ValueToString(mContext, *aRetValue);
ok = !!str;
*aRetValue = ok ? JS::StringValue(str) : JS::UndefinedValue();
}
--mExecuteDepth;
}
if (!ok) {
if (aRetValue) {
*aRetValue = JS::UndefinedValue();
}
// 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();
}
// ScriptEvaluated needs to come after we pop the stack
pusher.Pop();
ScriptEvaluated(true);
// Wrap the return value into whatever compartment mContext was in.
if (aRetValue && !JS_WrapValue(mContext, aRetValue))
return NS_ERROR_OUT_OF_MEMORY;
return NS_OK;
}
nsIScriptObjectPrincipal*
nsJSContext::GetObjectPrincipal()
{
nsCOMPtr<nsIScriptObjectPrincipal> prin = do_QueryInterface(GetGlobalObject());
return prin;
}
nsresult
nsJSContext::CompileScript(const PRUnichar* aText,
int32_t aTextLength,
nsIPrincipal *aPrincipal,
const char *aURL,
uint32_t aLineNo,
uint32_t aVersion,
JS::MutableHandle<JSScript*> aScriptObject,
bool aSaveSource /* = false */)
{
PROFILER_LABEL_PRINTF("JS", "Compile Script", "%s", aURL ? aURL : "");
NS_ENSURE_TRUE(mIsInitialized, NS_ERROR_NOT_INITIALIZED);
NS_ENSURE_ARG_POINTER(aPrincipal);
JSObject* scopeObject = ::JS_GetGlobalObject(mContext);
xpc_UnmarkGrayObject(scopeObject);
bool ok = false;
nsresult rv = sSecurityManager->CanExecuteScripts(mContext, aPrincipal, &ok);
if (NS_FAILED(rv)) {
return NS_ERROR_FAILURE;
}
aScriptObject.set(nullptr); // 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;
XPCAutoRequest ar(mContext);
JS::CompileOptions options(mContext);
JS::CompileOptions::SourcePolicy sp = aSaveSource ?
JS::CompileOptions::SAVE_SOURCE :
JS::CompileOptions::LAZY_SOURCE;
options.setPrincipals(nsJSPrincipals::get(aPrincipal))
.setFileAndLine(aURL, aLineNo)
.setVersion(JSVersion(aVersion))
.setSourcePolicy(sp);
JS::RootedObject rootedScope(mContext, scopeObject);
JSScript* script = JS::Compile(mContext,
rootedScope,
options,
static_cast<const jschar*>(aText),
aTextLength);
if (!script) {
return NS_ERROR_OUT_OF_MEMORY;
}
aScriptObject.set(script);
return NS_OK;
}
nsresult
nsJSContext::ExecuteScript(JSScript* aScriptObject,
JSObject* aScopeObject)
{
NS_ENSURE_TRUE(mIsInitialized, NS_ERROR_NOT_INITIALIZED);
if (!mScriptsEnabled) {
return NS_OK;
}
nsAutoMicroTask mt;
if (!aScopeObject) {
aScopeObject = JS_GetGlobalObject(mContext);
}
xpc_UnmarkGrayScript(aScriptObject);
xpc_UnmarkGrayObject(aScopeObject);
// Push our JSContext on our thread's context stack, in case native code
// called from JS calls back into JS via XPConnect.
nsCxPusher pusher;
pusher.Push(mContext);
nsJSContext::TerminationFuncHolder holder(this);
XPCAutoRequest ar(mContext);
// Scope the JSAutoCompartment so that it gets destroyed before we pop the
// cx and potentially call JS_RestoreFrameChain.
{
JSAutoCompartment ac(mContext, aScopeObject);
++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;
if (!JS_ExecuteScript(mContext, aScopeObject, aScriptObject, &val)) {
ReportPendingException();
}
--mExecuteDepth;
}
// Pop here, after JS_ValueToString and any other possible evaluation.
pusher.Pop();
// ScriptEvaluated needs to come after we pop the stack
ScriptEvaluated(true);
return NS_OK;
}
#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 = nullptr;
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 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 = xpc_UnmarkGrayObject(JSVAL_TO_OBJECT(v));
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;
}
PROFILER_LABEL("JS", "CallEventHandler");
nsAutoMicroTask mt;
xpc_UnmarkGrayObject(aScope);
xpc_UnmarkGrayObject(aHandler);
nsCxPusher pusher;
pusher.Push(mContext);
XPCAutoRequest ar(mContext);
JSObject* target = nullptr;
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.
// 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.
uint32_t argc = 0;
jsval *argv = nullptr;
JSObject *funobj = aHandler;
jsval funval = OBJECT_TO_JSVAL(funobj);
JSAutoCompartment ac(mContext, funobj);
if (!JS_WrapObject(mContext, &target)) {
ReportPendingException();
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);
for (uint32_t i = 0; i < argc; i++) {
if (!JSVAL_IS_PRIMITIVE(argv[i])) {
xpc_UnmarkGrayObject(JSVAL_TO_OBJECT(argv[i]));
}
}
++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 = nullptr;
} 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();
}
pusher.Pop();
// ScriptEvaluated needs to come after we pop the stack
ScriptEvaluated(true);
return rv;
}
nsresult
nsJSContext::BindCompiledEventHandler(nsISupports* aTarget, JSObject* aScope,
JSObject* aHandler,
JS::MutableHandle<JSObject*> aBoundHandler)
{
NS_ENSURE_ARG(aHandler);
NS_ENSURE_TRUE(mIsInitialized, NS_ERROR_NOT_INITIALIZED);
NS_PRECONDITION(!aBoundHandler, "Shouldn't already have a bound handler!");
xpc_UnmarkGrayObject(aScope);
xpc_UnmarkGrayObject(aHandler);
XPCAutoRequest ar(mContext);
// Get the jsobject associated with this target
JSObject *target = nullptr;
nsresult rv = JSObjectFromInterface(aTarget, aScope, &target);
NS_ENSURE_SUCCESS(rv, rv);
#ifdef DEBUG
{
JSAutoCompartment ac(mContext, aHandler);
NS_ASSERTION(JS_TypeOfValue(mContext,
OBJECT_TO_JSVAL(aHandler)) == JSTYPE_FUNCTION,
"Event handler object not a function");
}
#endif
JSAutoCompartment ac(mContext, target);
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;
return nsContentUtils::XPConnect()->WriteScript(aStream, mContext,
xpc_UnmarkGrayScript(aScriptObject));
}
nsresult
nsJSContext::Deserialize(nsIObjectInputStream* aStream,
JS::MutableHandle<JSScript*> aResult)
{
JSScript *script;
nsresult rv = nsContentUtils::XPConnect()->ReadScript(aStream, mContext, &script);
if (NS_FAILED(rv)) return rv;
aResult.set(script);
return NS_OK;
}
nsIScriptGlobalObject *
nsJSContext::GetGlobalObject()
{
JSObject *global = ::JS_GetGlobalObject(mContext);
if (!global) {
return nullptr;
}
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);
// Whenever we end up with globals that are JSCLASS_IS_DOMJSCLASS
// and have an nsISupports DOM object, we will need to modify this
// check here.
MOZ_ASSERT(!(c->flags & JSCLASS_IS_DOMJSCLASS));
if ((~c->flags) & (JSCLASS_HAS_PRIVATE |
JSCLASS_PRIVATE_IS_NSISUPPORTS)) {
return nullptr;
}
nsISupports *priv = static_cast<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);
}
JSContext*
nsJSContext::GetNativeContext()
{
return xpc_UnmarkGrayContext(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);
JSOptionChangedCallback(js_options_dot_str, this);
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)
{
uint32_t argc;
jsval *argv = nullptr;
nsCxPusher pusher;
pusher.Push(mContext);
XPCAutoRequest 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 (uint32_t 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,
uint32_t *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 != nullptr)
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 = nullptr;
*aArgc = 0;
nsIXPConnect *xpc = nsContentUtils::XPConnect();
NS_ENSURE_TRUE(xpc, NS_ERROR_UNEXPECTED);
if (!aArgs)
return NS_OK;
uint32_t 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);
aTempStorage.ref().SetCapacity(mContext, argCount);
jsval *argv = aTempStorage.ref().Elements();
if (argsArray) {
for (uint32_t 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 != nullptr) {
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 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 == nullptr,
"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;
uint16_t type;
argPrimitive->GetType(&type);
switch(type) {
case nsISupportsPrimitive::TYPE_CSTRING : {
nsCOMPtr<nsISupportsCString> p(do_QueryInterface(argPrimitive));
NS_ENSURE_TRUE(p, NS_ERROR_UNEXPECTED);
nsAutoCString 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);
uint8_t 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);
uint16_t 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);
uint32_t 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);
int16_t 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);
int32_t 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);
*aArgv = ::JS_NumberValue(data);
break;
}
case nsISupportsPrimitive::TYPE_DOUBLE : {
nsCOMPtr<nsISupportsDouble> p(do_QueryInterface(argPrimitive));
NS_ENSURE_TRUE(p, NS_ERROR_UNEXPECTED);
double data;
p->GetData(&data);
*aArgv = ::JS_NumberValue(data);
break;
}
case nsISupportsPrimitive::TYPE_INTERFACE_POINTER : {
nsCOMPtr<nsISupportsInterfacePointer> p(do_QueryInterface(argPrimitive));
NS_ENSURE_TRUE(p, NS_ERROR_UNEXPECTED);
nsCOMPtr<nsISupports> data;
nsIID *iid = nullptr;
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;
JSObject *global = xpc_UnmarkGrayObject(::JS_GetGlobalObject(cx));
jsval v;
nsresult rv = nsContentUtils::WrapNative(cx, global,
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)
{
if (nsContentUtils::IsCallerChrome())
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[] = {
JS_FS("TraceMallocDisable", TraceMallocDisable, 0, 0),
JS_FS("TraceMallocEnable", TraceMallocEnable, 0, 0),
JS_FS("TraceMallocOpenLogFile", TraceMallocOpenLogFile, 1, 0),
JS_FS("TraceMallocChangeLogFD", TraceMallocChangeLogFD, 1, 0),
JS_FS("TraceMallocCloseLogFD", TraceMallocCloseLogFD, 1, 0),
JS_FS("TraceMallocLogTimestamp", TraceMallocLogTimestamp, 1, 0),
JS_FS("TraceMallocDumpAllocations", TraceMallocDumpAllocations, 1, 0),
JS_FS_END
};
#endif /* NS_TRACE_MALLOC */
#ifdef MOZ_DMD
#include <errno.h>
namespace mozilla {
namespace dmd {
// See https://wiki.mozilla.org/Performance/MemShrink/DMD for instructions on
// how to use DMD.
static JSBool
ReportAndDump(JSContext *cx, unsigned argc, jsval *vp)
{
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;
FILE* fp = fopen(pathname.ptr(), "w");
if (!fp) {
JS_ReportError(cx, "DMD can't open %s: %s",
pathname.ptr(), strerror(errno));
return JS_FALSE;
}
dmd::ClearReports();
fprintf(stderr, "DMD: running reporters...\n");
dmd::RunReporters();
dmd::Writer writer(FpWrite, fp);
dmd::Dump(writer);
fclose(fp);
JS_SET_RVAL(cx, vp, JSVAL_VOID);
return JS_TRUE;
}
} // namespace dmd
} // namespace mozilla
static JSFunctionSpec DMDFunctions[] = {
JS_FS("DMDReportAndDump", dmd::ReportAndDump, 1, 0),
JS_FS_END
};
#endif // defined(MOZ_DMD)
#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, nullptr, &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, nullptr, &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, nullptr, &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[] = {
JS_FS("JProfStartProfiling", JProfStartProfilingJS, 0, 0),
JS_FS("JProfStopProfiling", JProfStopProfilingJS, 0, 0),
JS_FS("JProfClearCircular", JProfClearCircularJS, 0, 0),
JS_FS("JProfSaveCircular", JProfSaveCircularJS, 0, 0),
JS_FS_END
};
#endif /* defined(MOZ_JPROF) */
nsresult
nsJSContext::InitClasses(JSObject* aGlobalObj)
{
nsresult rv = InitializeExternalClasses();
NS_ENSURE_SUCCESS(rv, rv);
JSAutoRequest ar(mContext);
JSOptionChangedCallback(js_options_dot_str, this);
// 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_DMD
// Attempt to initialize DMD functions
::JS_DefineFunctions(mContext, aGlobalObj, DMDFunctions);
#endif
#ifdef MOZ_JPROF
// Attempt to initialize JProf functions
::JS_DefineFunctions(mContext, aGlobalObj, JProfFunctions);
#endif
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 = nullptr;
for (nsJSContext::TerminationFuncClosure* cur = start;
cur;
cur = cur->mNext) {
(*(cur->mTerminationFunc))(cur->mTerminationFuncArg);
}
delete start;
}
JS_MaybeGC(mContext);
if (aTerminated) {
mOperationCallbackTime = 0;
mModalStateTime = 0;
mActive = true;
}
}
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;
}
NS_IMETHODIMP
nsJSContext::ScriptExecuted()
{
ScriptEvaluated(!::JS_IsRunning(mContext));
return NS_OK;
}
void
FullGCTimerFired(nsITimer* aTimer, void* aClosure)
{
NS_RELEASE(sFullGCTimer);
uintptr_t reason = reinterpret_cast<uintptr_t>(aClosure);
nsJSContext::GarbageCollectNow(static_cast<JS::gcreason::Reason>(reason),
nsJSContext::IncrementalGC);
}
//static
void
nsJSContext::GarbageCollectNow(JS::gcreason::Reason aReason,
IsIncremental aIncremental,
IsCompartment aCompartment,
IsShrinking aShrinking,
int64_t aSliceMillis)
{
PROFILER_LABEL("GC", "GarbageCollectNow");
MOZ_ASSERT_IF(aSliceMillis, aIncremental == IncrementalGC);
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() || !nsJSRuntime::sRuntime) {
return;
}
if (sCCLockedOut && aIncremental == IncrementalGC) {
// We're in the middle of incremental GC. Do another slice.
JS::PrepareForIncrementalGC(nsJSRuntime::sRuntime);
JS::IncrementalGC(nsJSRuntime::sRuntime, aReason, aSliceMillis);
return;
}
// Use zone GC when we're not asked to do a shrinking GC nor
// global GC and compartment GC has been called less than
// NS_MAX_COMPARTMENT_GC_COUNT times after the previous global GC.
if (!sDisableExplicitCompartmentGC &&
aShrinking != ShrinkingGC && aCompartment != NonCompartmentGC &&
sCompartmentGCCount < NS_MAX_COMPARTMENT_GC_COUNT) {
JS::PrepareForFullGC(nsJSRuntime::sRuntime);
for (nsJSContext* cx = sContextList; cx; cx = cx->mNext) {
if (!cx->mActive && cx->mContext) {
if (JSObject* global = cx->GetNativeGlobal()) {
JS::SkipZoneForGC(JS::GetObjectZone(global));
}
}
cx->mActive = false;
}
if (JS::IsGCScheduled(nsJSRuntime::sRuntime)) {
if (aIncremental == IncrementalGC) {
JS::IncrementalGC(nsJSRuntime::sRuntime, aReason, aSliceMillis);
} else {
JS::GCForReason(nsJSRuntime::sRuntime, aReason);
}
}
return;
}
for (nsJSContext* cx = sContextList; cx; cx = cx->mNext) {
cx->mActive = false;
}
JS::PrepareForFullGC(nsJSRuntime::sRuntime);
if (aIncremental == IncrementalGC) {
JS::IncrementalGC(nsJSRuntime::sRuntime, aReason, aSliceMillis);
} else {
JS::GCForReason(nsJSRuntime::sRuntime, aReason);
}
}
//static
void
nsJSContext::ShrinkGCBuffersNow()
{
PROFILER_LABEL("GC", "ShrinkGCBuffersNow");
KillShrinkGCBuffersTimer();
JS::ShrinkGCBuffers(nsJSRuntime::sRuntime);
}
// Return true if any JSContext has a "global object" with a gray
// parent. The intent is to look for JS Object windows. We don't merge
// system compartments, so we don't use them to trigger merging CCs.
static bool
AnyGrayGlobalParent()
{
if (!nsJSRuntime::sRuntime) {
return false;
}
JSContext *iter = nullptr;
JSContext *cx;
while ((cx = JS_ContextIterator(nsJSRuntime::sRuntime, &iter))) {
if (JSObject *global = JS_GetGlobalObject(cx)) {
if (JSObject *parent = js::GetObjectParent(global)) {
if (JS::GCThingIsMarkedGray(parent) &&
!js::IsSystemCompartment(js::GetObjectCompartment(parent))) {
return true;
}
}
}
}
return false;
}
static bool
DoMergingCC(bool aForced)
{
// Don't merge too many times in a row, and do at least a minimum
// number of unmerged CCs in a row.
static const int32_t kMinConsecutiveUnmerged = 3;
static const int32_t kMaxConsecutiveMerged = 3;
static int32_t sUnmergedNeeded = 0;
static int32_t sMergedInARow = 0;
MOZ_ASSERT(0 <= sUnmergedNeeded && sUnmergedNeeded <= kMinConsecutiveUnmerged);
MOZ_ASSERT(0 <= sMergedInARow && sMergedInARow <= kMaxConsecutiveMerged);
if (sMergedInARow == kMaxConsecutiveMerged) {
MOZ_ASSERT(sUnmergedNeeded == 0);
sUnmergedNeeded = kMinConsecutiveUnmerged;
}
if (sUnmergedNeeded > 0) {
sUnmergedNeeded--;
sMergedInARow = 0;
return false;
}
if (!aForced && AnyGrayGlobalParent()) {
sMergedInARow++;
return true;
} else {
sMergedInARow = 0;
return false;
}
}
static void
FinishAnyIncrementalGC()
{
if (sCCLockedOut) {
// We're in the middle of an incremental GC, so finish it.
JS::PrepareForIncrementalGC(nsJSRuntime::sRuntime);
JS::FinishIncrementalGC(nsJSRuntime::sRuntime, JS::gcreason::CC_FORCED);
}
}
static void
FireForgetSkippable(uint32_t aSuspected, bool aRemoveChildless)
{
PRTime startTime = PR_Now();
FinishAnyIncrementalGC();
nsCycleCollector_forgetSkippable(aRemoveChildless);
sPreviousSuspectedCount = nsCycleCollector_suspectedCount();
++sCleanupsSinceLastGC;
PRTime delta = PR_Now() - startTime;
if (sMinForgetSkippableTime > delta) {
sMinForgetSkippableTime = delta;
}
if (sMaxForgetSkippableTime < delta) {
sMaxForgetSkippableTime = delta;
}
sTotalForgetSkippableTime += delta;
sRemovedPurples += (aSuspected - sPreviousSuspectedCount);
++sForgetSkippableBeforeCC;
}
MOZ_ALWAYS_INLINE
static uint32_t
TimeBetween(PRTime start, PRTime end)
{
MOZ_ASSERT(end >= start);
return (uint32_t)(end - start) / PR_USEC_PER_MSEC;
}
//static
void
nsJSContext::CycleCollectNow(nsICycleCollectorListener *aListener,
int32_t aExtraForgetSkippableCalls,
bool aForced)
{
if (!NS_IsMainThread()) {
return;
}
PROFILER_LABEL("CC", "CycleCollectNow");
PRTime start = PR_Now();
// Before we begin the cycle collection, make sure there is no active GC.
bool finishedIGC = sCCLockedOut;
FinishAnyIncrementalGC();
PRTime endGCTime = PR_Now();
uint32_t gcDuration = TimeBetween(start, endGCTime);
KillCCTimer();
uint32_t suspected = nsCycleCollector_suspectedCount();
bool ranSyncForgetSkippable = false;
// Run forgetSkippable synchronously to reduce the size of the CC graph. This
// is particularly useful if we recently finished a GC.
if (sCleanupsSinceLastGC < 2 && aExtraForgetSkippableCalls >= 0) {
while (sCleanupsSinceLastGC < 2) {
FireForgetSkippable(nsCycleCollector_suspectedCount(), false);
ranSyncForgetSkippable = true;
}
}
for (int32_t i = 0; i < aExtraForgetSkippableCalls; ++i) {
FireForgetSkippable(nsCycleCollector_suspectedCount(), false);
ranSyncForgetSkippable = true;
}
PRTime endSkippableTime = PR_Now();
uint32_t skippableDuration = TimeBetween(endGCTime, endSkippableTime);
// Prepare to actually run the CC.
bool mergingCC = DoMergingCC(aForced);
nsCycleCollectorResults ccResults;
nsCycleCollector_collect(mergingCC, &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 ||
sLikelyShortLivingObjectsNeedingGC > 2500) {
PokeGC(JS::gcreason::CC_WAITING);
}
PRTime endCCTime = PR_Now();
// Log information about the CC via telemetry, JSON and the console.
uint32_t ccNowDuration = TimeBetween(start, endCCTime);
Telemetry::Accumulate(Telemetry::CYCLE_COLLECTOR_FINISH_IGC, finishedIGC);
Telemetry::Accumulate(Telemetry::CYCLE_COLLECTOR_SYNC_SKIPPABLE, ranSyncForgetSkippable);
Telemetry::Accumulate(Telemetry::CYCLE_COLLECTOR_FULL, ccNowDuration);
if (sLastCCEndTime) {
uint32_t timeBetween = (uint32_t)(start - sLastCCEndTime) / PR_USEC_PER_SEC;
Telemetry::Accumulate(Telemetry::CYCLE_COLLECTOR_TIME_BETWEEN, timeBetween);
}
sLastCCEndTime = endCCTime;
Telemetry::Accumulate(Telemetry::FORGET_SKIPPABLE_MAX,
sMaxForgetSkippableTime / PR_USEC_PER_MSEC);
PRTime delta = GetCollectionTimeDelta();
uint32_t cleanups = sForgetSkippableBeforeCC ? sForgetSkippableBeforeCC : 1;
uint32_t minForgetSkippableTime = (sMinForgetSkippableTime == UINT32_MAX)
? 0 : sMinForgetSkippableTime;
if (sPostGCEventsToConsole) {
nsCString mergeMsg;
if (mergingCC) {
mergeMsg.AssignLiteral(" merged");
}
nsCString gcMsg;
if (ccResults.mForcedGC) {
gcMsg.AssignLiteral(", forced a GC");
}
NS_NAMED_MULTILINE_LITERAL_STRING(kFmt,
NS_LL("CC(T+%.1f) duration: %lums, suspected: %lu, visited: %lu RCed and %lu%s GCed, collected: %lu RCed and %lu GCed (%lu|%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, sync: %lu ms, removed: %lu"));
nsString msg;
msg.Adopt(nsTextFormatter::smprintf(kFmt.get(), double(delta) / PR_USEC_PER_SEC,
ccNowDuration, suspected,
ccResults.mVisitedRefCounted, ccResults.mVisitedGCed, mergeMsg.get(),
ccResults.mFreedRefCounted, ccResults.mFreedGCed,
sCCollectedWaitingForGC, sLikelyShortLivingObjectsNeedingGC,
gcMsg.get(),
sForgetSkippableBeforeCC,
minForgetSkippableTime / PR_USEC_PER_MSEC,
sMaxForgetSkippableTime / PR_USEC_PER_MSEC,
(sTotalForgetSkippableTime / cleanups) /
PR_USEC_PER_MSEC,
sTotalForgetSkippableTime / PR_USEC_PER_MSEC,
skippableDuration, sRemovedPurples));
nsCOMPtr<nsIConsoleService> cs =
do_GetService(NS_CONSOLESERVICE_CONTRACTID);
if (cs) {
cs->LogStringMessage(msg.get());
}
}
if (sPostGCEventsToObserver) {
NS_NAMED_MULTILINE_LITERAL_STRING(kJSONFmt,
NS_LL("{ \"timestamp\": %llu, ")
NS_LL("\"duration\": %llu, ")
NS_LL("\"finish_gc_duration\": %llu, ")
NS_LL("\"sync_skippable_duration\": %llu, ")
NS_LL("\"suspected\": %lu, ")
NS_LL("\"visited\": { ")
NS_LL("\"RCed\": %lu, ")
NS_LL("\"GCed\": %lu }, ")
NS_LL("\"collected\": { ")
NS_LL("\"RCed\": %lu, ")
NS_LL("\"GCed\": %lu }, ")
NS_LL("\"waiting_for_gc\": %lu, ")
NS_LL("\"short_living_objects_waiting_for_gc\": %lu, ")
NS_LL("\"forced_gc\": %d, ")
NS_LL("\"forget_skippable\": { ")
NS_LL("\"times_before_cc\": %lu, ")
NS_LL("\"min\": %lu, ")
NS_LL("\"max\": %lu, ")
NS_LL("\"avg\": %lu, ")
NS_LL("\"total\": %lu, ")
NS_LL("\"removed\": %lu } ")
NS_LL("}"));
nsString json;
json.Adopt(nsTextFormatter::smprintf(kJSONFmt.get(), endCCTime,
ccNowDuration, gcDuration, skippableDuration,
suspected,
ccResults.mVisitedRefCounted, ccResults.mVisitedGCed,
ccResults.mFreedRefCounted, ccResults.mFreedGCed,
sCCollectedWaitingForGC,
sLikelyShortLivingObjectsNeedingGC,
ccResults.mForcedGC,
sForgetSkippableBeforeCC,
minForgetSkippableTime / PR_USEC_PER_MSEC,
sMaxForgetSkippableTime / PR_USEC_PER_MSEC,
(sTotalForgetSkippableTime / cleanups) /
PR_USEC_PER_MSEC,
sTotalForgetSkippableTime / PR_USEC_PER_MSEC,
sRemovedPurples));
nsCOMPtr<nsIObserverService> observerService = mozilla::services::GetObserverService();
if (observerService) {
observerService->NotifyObservers(nullptr, "cycle-collection-statistics", json.get());
}
}
// Update global state to indicate we have just run a cycle collection.
sMinForgetSkippableTime = UINT32_MAX;
sMaxForgetSkippableTime = 0;
sTotalForgetSkippableTime = 0;
sRemovedPurples = 0;
sForgetSkippableBeforeCC = 0;
sNeedsFullCC = false;
}
// static
void
InterSliceGCTimerFired(nsITimer *aTimer, void *aClosure)
{
NS_RELEASE(sInterSliceGCTimer);
nsJSContext::GarbageCollectNow(JS::gcreason::INTER_SLICE_GC,
nsJSContext::IncrementalGC,
nsJSContext::CompartmentGC,
nsJSContext::NonShrinkingGC,
NS_INTERSLICE_GC_BUDGET);
}
// 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),
nsJSContext::IncrementalGC,
nsJSContext::CompartmentGC);
}
void
ShrinkGCBuffersTimerFired(nsITimer *aTimer, void *aClosure)
{
NS_RELEASE(sShrinkGCBuffersTimer);
nsJSContext::ShrinkGCBuffersNow();
}
static bool
ShouldTriggerCC(uint32_t aSuspected)
{
return sNeedsFullCC ||
aSuspected > NS_CC_PURPLE_LIMIT ||
(aSuspected > NS_CC_FORCED_PURPLE_LIMIT &&
sLastCCEndTime + NS_CC_FORCED < PR_Now());
}
static void
CCTimerFired(nsITimer *aTimer, void *aClosure)
{
if (sDidShutdown) {
return;
}
static uint32_t ccDelay = NS_CC_DELAY;
if (sCCLockedOut) {
ccDelay = NS_CC_DELAY / 3;
PRTime now = PR_Now();
if (sCCLockedOutTime == 0) {
// Reset sCCTimerFireCount so that we run forgetSkippable
// often enough before CC. Because of reduced ccDelay
// forgetSkippable will be called just a few times.
// NS_MAX_CC_LOCKEDOUT_TIME limit guarantees that we end up calling
// forgetSkippable and CycleCollectNow eventually.
sCCTimerFireCount = 0;
sCCLockedOutTime = now;
return;
}
if (now - sCCLockedOutTime < NS_MAX_CC_LOCKEDOUT_TIME) {
return;
}
}
++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 uint32_t numEarlyTimerFires = ccDelay / NS_CC_SKIPPABLE_DELAY - 2;
bool isLateTimerFire = sCCTimerFireCount > numEarlyTimerFires;
uint32_t suspected = nsCycleCollector_suspectedCount();
if (isLateTimerFire && ShouldTriggerCC(suspected)) {
if (sCCTimerFireCount == numEarlyTimerFires + 1) {
FireForgetSkippable(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. Let CycleCollectNow finish the current IGC, if any,
// because that will allow us to include the GC time in the CC pause.
nsJSContext::CycleCollectNow(nullptr, 0, false);
}
} else if ((sPreviousSuspectedCount + 100) <= suspected) {
// Only do a forget skippable if there are more than a few new objects.
FireForgetSkippable(suspected, false);
}
if (isLateTimerFire) {
ccDelay = NS_CC_DELAY;
// 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
uint32_t
nsJSContext::CleanupsSinceLastGC()
{
return sCleanupsSinceLastGC;
}
// 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 || sShuttingDown) {
// 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 || sShuttingDown) {
return;
}
CallCreateInstance("@mozilla.org/timer;1", &sShrinkGCBuffersTimer);
if (!sShrinkGCBuffersTimer) {
// Failed to create timer (probably because we're in XPCOM shutdown)
return;
}
sShrinkGCBuffersTimer->InitWithFuncCallback(ShrinkGCBuffersTimerFired, nullptr,
NS_SHRINK_GC_BUFFERS_DELAY,
nsITimer::TYPE_ONE_SHOT);
}
// static
void
nsJSContext::MaybePokeCC()
{
if (sCCTimer || sShuttingDown || !sHasRunGC) {
return;
}
if (ShouldTriggerCC(nsCycleCollector_suspectedCount())) {
sCCTimerFireCount = 0;
CallCreateInstance("@mozilla.org/timer;1", &sCCTimer);
if (!sCCTimer) {
return;
}
sCCTimer->InitWithFuncCallback(CCTimerFired, nullptr,
NS_CC_SKIPPABLE_DELAY,
nsITimer::TYPE_REPEATING_SLACK);
}
}
//static
void
nsJSContext::KillGCTimer()
{
if (sGCTimer) {
sGCTimer->Cancel();
NS_RELEASE(sGCTimer);
}
}
void
nsJSContext::KillFullGCTimer()
{
if (sFullGCTimer) {
sFullGCTimer->Cancel();
NS_RELEASE(sFullGCTimer);
}
}
void
nsJSContext::KillInterSliceGCTimer()
{
if (sInterSliceGCTimer) {
sInterSliceGCTimer->Cancel();
NS_RELEASE(sInterSliceGCTimer);
}
}
//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)
{
mActive = true;
PokeGC(aReason);
}
class NotifyGCEndRunnable : public nsRunnable
{
nsString mMessage;
public:
NotifyGCEndRunnable(const nsString& aMessage) : mMessage(aMessage) {}
NS_DECL_NSIRUNNABLE
};
NS_IMETHODIMP
NotifyGCEndRunnable::Run()
{
MOZ_ASSERT(NS_IsMainThread());
nsCOMPtr<nsIObserverService> observerService = mozilla::services::GetObserverService();
if (!observerService) {
return NS_OK;
}
const jschar oomMsg[3] = { '{', '}', 0 };
const jschar *toSend = mMessage.get() ? mMessage.get() : oomMsg;
observerService->NotifyObservers(nullptr, "garbage-collection-statistics", toSend);
return NS_OK;
}
static void
DOMGCSliceCallback(JSRuntime *aRt, JS::GCProgress aProgress, const JS::GCDescription &aDesc)
{
NS_ASSERTION(NS_IsMainThread(), "GCs must run on the main thread");
if (aProgress == JS::GC_CYCLE_END) {
PRTime delta = GetCollectionTimeDelta();
if (sPostGCEventsToConsole) {
NS_NAMED_LITERAL_STRING(kFmt, "GC(T+%.1f) ");
nsString prefix, gcstats;
gcstats.Adopt(aDesc.formatMessage(aRt));
prefix.Adopt(nsTextFormatter::smprintf(kFmt.get(),
double(delta) / PR_USEC_PER_SEC));
nsString msg = prefix + gcstats;
nsCOMPtr<nsIConsoleService> cs = do_GetService(NS_CONSOLESERVICE_CONTRACTID);
if (cs) {
cs->LogStringMessage(msg.get());
}
}
if (sPostGCEventsToObserver) {
nsString json;
json.Adopt(aDesc.formatJSON(aRt, PR_Now()));
nsRefPtr<NotifyGCEndRunnable> notify = new NotifyGCEndRunnable(json);
NS_DispatchToMainThread(notify);
}
}
// 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::KillInterSliceGCTimer();
if (!sShuttingDown) {
CallCreateInstance("@mozilla.org/timer;1", &sInterSliceGCTimer);
sInterSliceGCTimer->InitWithFuncCallback(InterSliceGCTimerFired,
NULL,
NS_INTERSLICE_GC_DELAY,
nsITimer::TYPE_ONE_SHOT);
}
}
if (aProgress == JS::GC_CYCLE_END) {
// May need to kill the inter-slice GC timer
nsJSContext::KillInterSliceGCTimer();
sCCollectedWaitingForGC = 0;
sLikelyShortLivingObjectsNeedingGC = 0;
sCleanupsSinceLastGC = 0;
sNeedsFullCC = true;
sHasRunGC = true;
nsJSContext::MaybePokeCC();
if (aDesc.isCompartment_) {
++sCompartmentGCCount;
if (!sFullGCTimer && !sShuttingDown) {
CallCreateInstance("@mozilla.org/timer;1", &sFullGCTimer);
JS::gcreason::Reason reason = JS::gcreason::FULL_GC_TIMER;
sFullGCTimer->InitWithFuncCallback(FullGCTimerFired,
reinterpret_cast<void *>(reason),
NS_FULL_GC_DELAY,
nsITimer::TYPE_ONE_SHOT);
}
} else {
sCompartmentGCCount = 0;
nsJSContext::KillFullGCTimer();
// Avoid shrinking during heavy activity, which is suggested by
// compartment GC.
nsJSContext::PokeShrinkGCBuffers();
}
}
if (sPrevGCSliceCallback)
(*sPrevGCSliceCallback)(aRt, aProgress, aDesc);
}
static void
DOMAnalysisPurgeCallback(JSRuntime *aRt, JSFlatString *aDesc)
{
NS_ASSERTION(NS_IsMainThread(), "GCs must run on the main thread");
PRTime delta = GetCollectionTimeDelta();
if (sPostGCEventsToConsole) {
NS_NAMED_LITERAL_STRING(kFmt, "Analysis Purge (T+%.1f) ");
nsString prefix;
prefix.Adopt(nsTextFormatter::smprintf(kFmt.get(),
double(delta) / PR_USEC_PER_SEC));
nsDependentJSString stats(aDesc);
nsString msg = prefix + stats;
nsCOMPtr<nsIConsoleService> cs = do_GetService(NS_CONSOLESERVICE_CONTRACTID);
if (cs) {
cs->LogStringMessage(msg.get());
}
}
if (sPrevAnalysisPurgeCallback)
(*sPrevAnalysisPurgeCallback)(aRt, aDesc);
}
void
nsJSContext::ReportPendingException()
{
if (mIsInitialized) {
nsJSUtils::ReportPendingException(mContext);
}
}
void
nsJSContext::LikelyShortLivingObjectCreated()
{
++sLikelyShortLivingObjectsNeedingGC;
}
/**********************************************************************
* 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(bool aGCOnDestruction,
nsIScriptGlobalObject* aGlobalObject)
{
nsCOMPtr<nsIScriptContext> scriptContext =
new nsJSContext(sRuntime, aGCOnDestruction, aGlobalObject);
return scriptContext.forget();
}
//static
void
nsJSRuntime::Startup()
{
// initialize all our statics, so that we can restart XPCOM
sGCTimer = sFullGCTimer = sCCTimer = nullptr;
sCCLockedOut = false;
sCCLockedOutTime = 0;
sLastCCEndTime = 0;
sHasRunGC = false;
sPendingLoadCount = 0;
sLoadingInProgress = false;
sCCollectedWaitingForGC = 0;
sLikelyShortLivingObjectsNeedingGC = 0;
sPostGCEventsToConsole = false;
sDisableExplicitCompartmentGC = false;
sNeedsFullCC = false;
gNameSpaceManager = nullptr;
sRuntimeService = nullptr;
sRuntime = nullptr;
sIsInitialized = false;
sDidShutdown = false;
sShuttingDown = false;
sContextCount = 0;
sSecurityManager = nullptr;
}
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;
int32_t time = Preferences::GetInt(aPrefName, isChromePref ? 20 : 10);
PRTime t;
if (time <= 0) {
t = NS_UNLIMITED_SCRIPT_RUNTIME;
} 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)
{
int32_t 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)
{
int32_t pref = Preferences::GetInt(aPrefName, -1);
// handle overflow and negative pref values
uint32_t max = (pref <= 0 || pref >= 0x1000) ? -1 : (uint32_t)pref * 1024 * 1024;
JS_SetGCParameter(nsJSRuntime::sRuntime, JSGC_MAX_BYTES, max);
return 0;
}
static int
SetMemoryGCModePrefChangedCallback(const char* aPrefName, void* aClosure)
{
bool enableCompartmentGC = Preferences::GetBool("javascript.options.mem.gc_per_compartment");
bool 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)
{
int32_t 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;
}
static int
SetMemoryGCPrefChangedCallback(const char* aPrefName, void* aClosure)
{
int32_t pref = Preferences::GetInt(aPrefName, -1);
// handle overflow and negative pref values
if (pref > 0 && pref < 10000)
JS_SetGCParameter(nsJSRuntime::sRuntime, (JSGCParamKey)(intptr_t)aClosure, pref);
return 0;
}
static int
SetMemoryGCDynamicHeapGrowthPrefChangedCallback(const char* aPrefName, void* aClosure)
{
bool pref = Preferences::GetBool(aPrefName);
JS_SetGCParameter(nsJSRuntime::sRuntime, JSGC_DYNAMIC_HEAP_GROWTH, pref);
return 0;
}
static int
SetMemoryGCDynamicMarkSlicePrefChangedCallback(const char* aPrefName, void* aClosure)
{
bool pref = Preferences::GetBool(aPrefName);
JS_SetGCParameter(nsJSRuntime::sRuntime, JSGC_DYNAMIC_MARK_SLICE, pref);
return 0;
}
JSObject*
NS_DOMReadStructuredClone(JSContext* cx,
JSStructuredCloneReader* reader,
uint32_t tag,
uint32_t data,
void* closure)
{
if (tag == SCTAG_DOM_IMAGEDATA) {
// Read the information out of the stream.
uint32_t width, height;
JS::Value dataArray;
if (!JS_ReadUint32Pair(reader, &width, &height) ||
!JS_ReadTypedArray(reader, &dataArray)) {
return nullptr;
}
MOZ_ASSERT(dataArray.isObject());
// Construct the ImageData.
nsRefPtr<ImageData> imageData = new ImageData(width, height,
dataArray.toObject());
// Wrap it in a jsval.
JSObject* global = JS_GetGlobalForScopeChain(cx);
if (!global) {
return nullptr;
}
return imageData->WrapObject(cx, global);
}
// Don't know what this is. Bail.
xpc::Throw(cx, NS_ERROR_DOM_DATA_CLONE_ERR);
return nullptr;
}
JSBool
NS_DOMWriteStructuredClone(JSContext* cx,
JSStructuredCloneWriter* writer,
JSObject* obj,
void *closure)
{
ImageData* imageData;
nsresult rv = UnwrapObject<ImageData>(cx, obj, imageData);
if (NS_FAILED(rv)) {
// Don't know what this is. Bail.
xpc::Throw(cx, NS_ERROR_DOM_DATA_CLONE_ERR);
return JS_FALSE;
}
// Prepare the ImageData internals.
uint32_t width = imageData->Width();
uint32_t height = imageData->Height();
JS::Value dataArray = JS::ObjectValue(*imageData->GetDataObject());
// Write the internals to the stream.
return JS_WriteUint32Pair(writer, SCTAG_DOM_IMAGEDATA, 0) &&
JS_WriteUint32Pair(writer, width, height) &&
JS_WriteTypedArray(writer, dataArray);
}
void
NS_DOMStructuredCloneError(JSContext* cx,
uint32_t errorid)
{
// We don't currently support any extensions to structured cloning.
xpc::Throw(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);
sPrevAnalysisPurgeCallback = js::SetAnalysisPurgeCallback(sRuntime, DOMAnalysisPurgeCallback);
// Set up the structured clone callbacks.
static JSStructuredCloneCallbacks cloneCallbacks = {
NS_DOMReadStructuredClone,
NS_DOMWriteStructuredClone,
NS_DOMStructuredCloneError
};
JS_SetStructuredCloneCallbacks(sRuntime, &cloneCallbacks);
static js::DOMCallbacks DOMcallbacks = {
InstanceClassHasProtoAtDepth
};
SetDOMCallbacks(sRuntime, &DOMcallbacks);
// Set these global xpconnect options...
Preferences::RegisterCallbackAndCall(MaxScriptRunTimePrefChangedCallback,
"dom.max_script_run_time");
Preferences::RegisterCallbackAndCall(MaxScriptRunTimePrefChangedCallback,
"dom.max_chrome_script_run_time");
Preferences::RegisterCallbackAndCall(ReportAllJSExceptionsPrefChangedCallback,
"dom.report_all_js_exceptions");
Preferences::RegisterCallbackAndCall(SetMemoryHighWaterMarkPrefChangedCallback,
"javascript.options.mem.high_water_mark");
Preferences::RegisterCallbackAndCall(SetMemoryMaxPrefChangedCallback,
"javascript.options.mem.max");
Preferences::RegisterCallbackAndCall(SetMemoryGCModePrefChangedCallback,
"javascript.options.mem.gc_per_compartment");
Preferences::RegisterCallbackAndCall(SetMemoryGCModePrefChangedCallback,
"javascript.options.mem.gc_incremental");
Preferences::RegisterCallbackAndCall(SetMemoryGCSliceTimePrefChangedCallback,
"javascript.options.mem.gc_incremental_slice_ms");
Preferences::RegisterCallbackAndCall(SetMemoryGCPrefChangedCallback,
"javascript.options.mem.gc_high_frequency_time_limit_ms",
(void *)JSGC_HIGH_FREQUENCY_TIME_LIMIT);
Preferences::RegisterCallbackAndCall(SetMemoryGCDynamicMarkSlicePrefChangedCallback,
"javascript.options.mem.gc_dynamic_mark_slice");
Preferences::RegisterCallbackAndCall(SetMemoryGCDynamicHeapGrowthPrefChangedCallback,
"javascript.options.mem.gc_dynamic_heap_growth");
Preferences::RegisterCallbackAndCall(SetMemoryGCPrefChangedCallback,
"javascript.options.mem.gc_low_frequency_heap_growth",
(void *)JSGC_LOW_FREQUENCY_HEAP_GROWTH);
Preferences::RegisterCallbackAndCall(SetMemoryGCPrefChangedCallback,
"javascript.options.mem.gc_high_frequency_heap_growth_min",
(void *)JSGC_HIGH_FREQUENCY_HEAP_GROWTH_MIN);
Preferences::RegisterCallbackAndCall(SetMemoryGCPrefChangedCallback,
"javascript.options.mem.gc_high_frequency_heap_growth_max",
(void *)JSGC_HIGH_FREQUENCY_HEAP_GROWTH_MAX);
Preferences::RegisterCallbackAndCall(SetMemoryGCPrefChangedCallback,
"javascript.options.mem.gc_high_frequency_low_limit_mb",
(void *)JSGC_HIGH_FREQUENCY_LOW_LIMIT);
Preferences::RegisterCallbackAndCall(SetMemoryGCPrefChangedCallback,
"javascript.options.mem.gc_high_frequency_high_limit_mb",
(void *)JSGC_HIGH_FREQUENCY_HIGH_LIMIT);
Preferences::RegisterCallbackAndCall(SetMemoryGCPrefChangedCallback,
"javascript.options.mem.analysis_purge_mb",
(void *)JSGC_ANALYSIS_PURGE_TRIGGER);
Preferences::RegisterCallbackAndCall(SetMemoryGCPrefChangedCallback,
"javascript.options.mem.gc_allocation_threshold_mb",
(void *)JSGC_ALLOCATION_THRESHOLD);
nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
if (!obs)
return NS_ERROR_FAILURE;
Preferences::AddBoolVarCache(&sGCOnMemoryPressure,
"javascript.options.gc_on_memory_pressure",
true);
nsIObserver* observer = new nsJSEnvironmentObserver();
obs->AddObserver(observer, "memory-pressure", false);
obs->AddObserver(observer, "quit-application", false);
sIsInitialized = true;
return NS_OK;
}
//static
nsScriptNameSpaceManager*
nsJSRuntime::GetNameSpaceManager()
{
if (sDidShutdown)
return nullptr;
if (!gNameSpaceManager) {
gNameSpaceManager = new nsScriptNameSpaceManager;
NS_ADDREF(gNameSpaceManager);
nsresult rv = gNameSpaceManager->Init();
NS_ENSURE_SUCCESS(rv, nullptr);
}
return gNameSpaceManager;
}
/* static */
void
nsJSRuntime::Shutdown()
{
KillTimers();
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);
}
sShuttingDown = true;
sDidShutdown = true;
}
// A factory for the runtime.
nsresult NS_CreateJSRuntime(nsIScriptRuntime **aRuntime)
{
nsresult rv = nsJSRuntime::Init();
NS_ENSURE_SUCCESS(rv, rv);
*aRuntime = new nsJSRuntime();
if (*aRuntime == nullptr)
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 MOZ_FINAL : public nsIJSArgArray {
public:
nsJSArgArray(JSContext *aContext, uint32_t 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(uint32_t *argc, void **argv);
void ReleaseJSObjects();
protected:
JSContext *mContext;
jsval *mArgv;
uint32_t mArgc;
};
nsJSArgArray::nsJSArgArray(JSContext *aContext, uint32_t argc, jsval *argv,
nsresult *prv) :
mContext(aContext),
mArgv(nullptr),
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 (uint32_t i = 0; i < argc; ++i)
mArgv[i] = argv[i];
}
if (argc > 0) {
NS_HOLD_JS_OBJECTS(this, nsJSArgArray);
}
*prv = NS_OK;
}
nsJSArgArray::~nsJSArgArray()
{
ReleaseJSObjects();
}
void
nsJSArgArray::ReleaseJSObjects()
{
if (mArgv) {
PR_DELETE(mArgv);
}
if (mArgc > 0) {
mArgc = 0;
NS_DROP_JS_OBJECTS(this, nsJSArgArray);
}
}
// QueryInterface implementation for 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_JS_CALLBACK(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(uint32_t *argc, void **argv)
{
*argv = (void *)mArgv;
*argc = mArgc;
return NS_OK;
}
// nsIArray impl
NS_IMETHODIMP nsJSArgArray::GetLength(uint32_t *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(uint32_t index, const nsIID & uuid, void * *result)
{
*result = nullptr;
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(uint32_t startIndex, nsISupports *element, uint32_t *_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, uint32_t argc, void *argv,
nsIJSArgArray **aArray)
{
nsresult rv;
nsJSArgArray *ret = new nsJSArgArray(aContext, argc,
static_cast<jsval *>(argv), &rv);
if (ret == nullptr)
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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