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01f304382c
gecko/dom/base/nsJSEnvironment.cpp
Bobby Holley 01f304382c Bug 860941 - Separate the handling of |dialogArguments| and |arguments|, and use IDL for the |dialogArguments| getter. r=jst 
This patch is bigger than I'd like it to be, but there are a lot of interlocked
dependencies and I eventually decided it was easier to just lump it together.

The semantics of |showModalDialog|/|window.dialogArguments| (an web-exposed
HTML5 feature) and |openDialog|/|window.arguments| (a XUL-proprietary feature)
are quite different. The former is essentially a security-checked JSVal, while
the latter gets converted into an array. We handled them together in the old
world, which led to a lot of confusion and muddled semantics. This patch
separates them.

This patch also eschews the roundabout resolve hook for dialogArguments in favor
of returning them directly from the XPIDL getter. This better matches the
behavior in the spec, especially because it allows dialogArguments to live on
the outer as they're supposed to, rather than the first inner that happens to
end up in the docshell. All in all, this should make this all very
straightforward to convert WebIDL when the time comes.

The current spec on the origin checks here is pretty fictional, so I've filed
https://www.w3.org/Bugs/Public/show_bug.cgi?id=21932 to fix it. This patch
should more or less preserve the current security behavior.
2013-05-16 23:33:14 -07:00

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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 "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")) {
if(StringBeginsWith(nsDependentString(aData),
NS_LITERAL_STRING("low-memory-ongoing"))) {
// Don't GC/CC if we are in an ongoing low-memory state since its very
// slow and it likely won't help us anyway.
return NS_OK;
}
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(JS::Value));
resetRooter(cx);
}
JS::Value *Elements() {
return vals.Elements();
}
private:
void resetRooter(JSContext *cx) {
avr.changeArray(vals.Elements(), vals.Length());
}
nsAutoTArray<JS::Value, 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 = win->GetExtantDoc();
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);
// Get the nsIPrompt interface from the docshell
nsCOMPtr<nsIPrompt> prompt = do_GetInterface(docShell);
return prompt.forget();
}
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
JS::RootedScript script(cx);
unsigned lineno;
JSBool hasFrame = ::JS_DescribeScriptedCaller(cx, script.address(), &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 "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(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,
JS::Handle<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;
}
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);
JS::Rooted<JSObject*> scopeObject(mContext, ::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_)
{
JS::Rooted<JSObject*> aScopeObject(mContext, aScopeObject_);
JS::Rooted<JSScript*> aScriptObject(mContext, aScriptObject_);
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.
JS::Value 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,
JS::Handle<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.
JS::Rooted<JS::Value> v(mContext);
nsresult rv = nsContentUtils::WrapNative(mContext, aScope, aTarget,
v.address());
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::BindCompiledEventHandler(nsISupports* aTarget,
JS::Handle<JSObject*> aScope,
JS::Handle<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
JS::Rooted<JSObject*> target(mContext);
JS::Rooted<JSObject*> scope(mContext, aScope);
nsresult rv = JSObjectFromInterface(aTarget, scope, target.address());
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)
{
JS::Rooted<JSScript*> script(mContext);
nsresult rv = nsContentUtils::XPConnect()->ReadScript(aStream, mContext,
script.address());
if (NS_FAILED(rv)) return rv;
aResult.set(script);
return NS_OK;
}
nsIScriptGlobalObject *
nsJSContext::GetGlobalObject()
{
JS::Rooted<JSObject*> global(mContext, ::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(JS::Handle<JSObject*> aTarget, const char* aPropName, nsISupports* aArgs)
{
uint32_t argc;
JS::Value *argv = nullptr;
nsCxPusher pusher;
pusher.Push(mContext);
XPCAutoRequest ar(mContext);
Maybe<nsRootedJSValueArray> tempStorage;
JS::Rooted<JSObject*> global(mContext, GetNativeGlobal());
nsresult rv =
ConvertSupportsTojsvals(aArgs, global, &argc, &argv, tempStorage);
NS_ENSURE_SUCCESS(rv, rv);
// got the arguments, now attach them.
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);
JS::Value vargs = OBJECT_TO_JSVAL(args);
return JS_DefineProperty(mContext, aTarget, aPropName, vargs, NULL, NULL, 0)
? NS_OK
: NS_ERROR_FAILURE;
}
nsresult
nsJSContext::ConvertSupportsTojsvals(nsISupports *aArgs,
JS::Handle<JSObject*> aScope,
uint32_t *aArgc,
JS::Value **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);
JS::Value *argv = aTempStorage.ref().Elements();
if (argsArray) {
for (uint32_t argCtr = 0; argCtr < argCount && NS_SUCCEEDED(rv); argCtr++) {
nsCOMPtr<nsISupports> arg;
JS::Value *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;
JS::Rooted<JS::Value> v(mContext);
rv = nsContentUtils::WrapNative(mContext, aScope, arg, v.address(),
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, JS::Value *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;
JS::Rooted<JSObject*> global(cx,
xpc_UnmarkGrayObject(::JS_GetGlobalObject(cx)));
JS::Rooted<JS::Value> v(cx);
nsresult rv = nsContentUtils::WrapNative(cx, global,
data, iid, v.address(),
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, JS::Value *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, JS::Value *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, JS::Value *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, JS::Value *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, JS::Value *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, JS::Value *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, JS::Value *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 const 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, JS::Value *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 const 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, JS::Value *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, JS::Value *vp)
{
NS_JProfStopProfiling();
return JS_TRUE;
}
void
NS_JProfStopProfiling()
{
raise(SIGUSR1);
//printf("Stopped jprof profiling.\n");
}
static JSBool
JProfClearCircularJS(JSContext *cx, unsigned argc, JS::Value *vp)
{
NS_JProfClearCircular();
return JS_TRUE;
}
void
NS_JProfClearCircular()
{
raise(SIGUSR2);
//printf("cleared jprof buffer\n");
}
static JSBool
JProfSaveCircularJS(JSContext *cx, unsigned argc, JS::Value *vp)
{
// Not ideal...
NS_JProfStopProfiling();
NS_JProfStartProfiling();
return JS_TRUE;
}
static const 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(JS::Handle<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 there exists a JSContext with a default global whose current
// inner is gray. 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
AnyGrayCurrentContentInnerWindows()
{
if (!nsJSRuntime::sRuntime) {
return false;
}
JSContext *iter = nullptr;
JSContext *cx;
while ((cx = JS_ContextIterator(nsJSRuntime::sRuntime, &iter))) {
// Skip anything without an nsIScriptContext, as well as any scx whose
// NativeGlobal() is not an outer window (this happens with XUL Prototype
// compilation scopes, for example, which we're not interested in).
nsIScriptContext *scx = GetScriptContextFromJSContext(cx);
JS::RootedObject global(cx, scx ? scx->GetNativeGlobal() : nullptr);
if (!global || !js::GetObjectParent(global)) {
continue;
}
// Grab the inner from the outer.
global = JS_ObjectToInnerObject(cx, global);
MOZ_ASSERT(!js::GetObjectParent(global));
if (JS::GCThingIsMarkedGray(global) &&
!js::IsSystemCompartment(js::GetObjectCompartment(global))) {
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 && AnyGrayCurrentContentInnerWindows()) {
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, JS::Handle<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::Rooted<JS::Value> dataArray(cx);
if (!JS_ReadUint32Pair(reader, &width, &height) ||
!JS_ReadTypedArray(reader, dataArray.address())) {
return nullptr;
}
MOZ_ASSERT(dataArray.isObject());
// Construct the ImageData.
nsRefPtr<ImageData> imageData = new ImageData(width, height,
dataArray.toObject());
// Wrap it in a JS::Value.
JS::Rooted<JSObject*> global(cx, 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,
JS::Handle<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::Rooted<JSObject*> dataArray(cx, imageData->GetDataObject());
// Write the internals to the stream.
JSAutoCompartment ac(cx, dataArray);
return JS_WriteUint32Pair(writer, SCTAG_DOM_IMAGEDATA, 0) &&
JS_WriteUint32Pair(writer, width, height) &&
JS_WriteTypedArray(writer, JS::ObjectValue(*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, JS::Value *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;
JS::Value *mArgv;
uint32_t mArgc;
};
nsJSArgArray::nsJSArgArray(JSContext *aContext, uint32_t argc, JS::Value *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 = (JS::Value *) PR_CALLOC(argc * sizeof(JS::Value));
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)
JS::Value *argv = tmp->mArgv;
if (argv) {
JS::Value *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<JS::Value *>(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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