gecko-dev/dom/base/ScriptSettings.cpp

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24 KiB
C++

/* -*- 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 "mozilla/dom/ScriptSettings.h"
#include "mozilla/ThreadLocal.h"
#include "mozilla/Assertions.h"
#include "mozilla/CycleCollectedJSContext.h"
#include "jsapi.h"
#include "xpcpublic.h"
#include "nsIGlobalObject.h"
#include "nsIDocShell.h"
#include "nsIScriptGlobalObject.h"
#include "nsIScriptContext.h"
#include "nsContentUtils.h"
#include "nsGlobalWindow.h"
#include "nsPIDOMWindow.h"
#include "nsTArray.h"
#include "nsJSUtils.h"
#include "nsDOMJSUtils.h"
#include "WorkerPrivate.h"
namespace mozilla {
namespace dom {
static MOZ_THREAD_LOCAL(ScriptSettingsStackEntry*) sScriptSettingsTLS;
static bool sScriptSettingsTLSInitialized;
class ScriptSettingsStack {
public:
static ScriptSettingsStackEntry* Top() {
return sScriptSettingsTLS.get();
}
static void Push(ScriptSettingsStackEntry *aEntry) {
MOZ_ASSERT(!aEntry->mOlder);
// Whenever JSAPI use is disabled, the next stack entry pushed must
// not be an AutoIncumbentScript.
MOZ_ASSERT_IF(!Top() || Top()->NoJSAPI(),
!aEntry->IsIncumbentScript());
// Whenever the top entry is not an incumbent canidate, the next stack entry
// pushed must not be an AutoIncumbentScript.
MOZ_ASSERT_IF(Top() && !Top()->IsIncumbentCandidate(),
!aEntry->IsIncumbentScript());
aEntry->mOlder = Top();
sScriptSettingsTLS.set(aEntry);
}
static void Pop(ScriptSettingsStackEntry *aEntry) {
MOZ_ASSERT(aEntry == Top());
sScriptSettingsTLS.set(aEntry->mOlder);
}
static nsIGlobalObject* IncumbentGlobal() {
ScriptSettingsStackEntry *entry = Top();
while (entry) {
if (entry->IsIncumbentCandidate()) {
return entry->mGlobalObject;
}
entry = entry->mOlder;
}
return nullptr;
}
static ScriptSettingsStackEntry* EntryPoint() {
ScriptSettingsStackEntry *entry = Top();
while (entry) {
if (entry->IsEntryCandidate()) {
return entry;
}
entry = entry->mOlder;
}
return nullptr;
}
static nsIGlobalObject* EntryGlobal() {
ScriptSettingsStackEntry *entry = EntryPoint();
if (!entry) {
return nullptr;
}
return entry->mGlobalObject;
}
#ifdef DEBUG
static ScriptSettingsStackEntry* TopNonIncumbentScript() {
ScriptSettingsStackEntry *entry = Top();
while (entry) {
if (!entry->IsIncumbentScript()) {
return entry;
}
entry = entry->mOlder;
}
return nullptr;
}
#endif // DEBUG
};
static unsigned long gRunToCompletionListeners = 0;
void
UseEntryScriptProfiling()
{
MOZ_ASSERT(NS_IsMainThread());
++gRunToCompletionListeners;
}
void
UnuseEntryScriptProfiling()
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(gRunToCompletionListeners > 0);
--gRunToCompletionListeners;
}
void
InitScriptSettings()
{
bool success = sScriptSettingsTLS.init();
if (!success) {
MOZ_CRASH();
}
sScriptSettingsTLS.set(nullptr);
sScriptSettingsTLSInitialized = true;
}
void
DestroyScriptSettings()
{
MOZ_ASSERT(sScriptSettingsTLS.get() == nullptr);
}
bool
ScriptSettingsInitialized()
{
return sScriptSettingsTLSInitialized;
}
ScriptSettingsStackEntry::ScriptSettingsStackEntry(nsIGlobalObject *aGlobal,
Type aType)
: mGlobalObject(aGlobal)
, mType(aType)
, mOlder(nullptr)
{
MOZ_ASSERT_IF(IsIncumbentCandidate() && !NoJSAPI(), mGlobalObject);
MOZ_ASSERT(!mGlobalObject || mGlobalObject->GetGlobalJSObject(),
"Must have an actual JS global for the duration on the stack");
MOZ_ASSERT(!mGlobalObject ||
JS_IsGlobalObject(mGlobalObject->GetGlobalJSObject()),
"No outer windows allowed");
}
ScriptSettingsStackEntry::~ScriptSettingsStackEntry()
{
// We must have an actual JS global for the entire time this is on the stack.
MOZ_ASSERT_IF(mGlobalObject, mGlobalObject->GetGlobalJSObject());
}
// If the entry or incumbent global ends up being something that the subject
// principal doesn't subsume, we don't want to use it. This never happens on
// the web, but can happen with asymmetric privilege relationships (i.e.
// nsExpandedPrincipal and System Principal).
//
// The most correct thing to use instead would be the topmost global on the
// callstack whose principal is subsumed by the subject principal. But that's
// hard to compute, so we just substitute the global of the current
// compartment. In practice, this is fine.
//
// Note that in particular things like:
//
// |SpecialPowers.wrap(crossOriginWindow).eval(open())|
//
// trigger this case. Although both the entry global and the current global
// have normal principals, the use of Gecko-specific System-Principaled JS
// puts the code from two different origins on the callstack at once, which
// doesn't happen normally on the web.
static nsIGlobalObject*
ClampToSubject(nsIGlobalObject* aGlobalOrNull)
{
if (!aGlobalOrNull || !NS_IsMainThread()) {
return aGlobalOrNull;
}
nsIPrincipal* globalPrin = aGlobalOrNull->PrincipalOrNull();
NS_ENSURE_TRUE(globalPrin, GetCurrentGlobal());
if (!nsContentUtils::SubjectPrincipalOrSystemIfNativeCaller()->SubsumesConsideringDomain(globalPrin)) {
return GetCurrentGlobal();
}
return aGlobalOrNull;
}
nsIGlobalObject*
GetEntryGlobal()
{
return ClampToSubject(ScriptSettingsStack::EntryGlobal());
}
nsIDocument*
GetEntryDocument()
{
nsIGlobalObject* global = GetEntryGlobal();
nsCOMPtr<nsPIDOMWindowInner> entryWin = do_QueryInterface(global);
// If our entry global isn't a window, see if it's an addon scope associated
// with a window. If it is, the caller almost certainly wants that rather
// than null.
if (!entryWin && global) {
if (auto* win = xpc::AddonWindowOrNull(global->GetGlobalJSObject())) {
entryWin = win->AsInner();
}
}
return entryWin ? entryWin->GetExtantDoc() : nullptr;
}
nsIGlobalObject*
GetIncumbentGlobal()
{
// We need the current JSContext in order to check the JS for
// scripted frames that may have appeared since anyone last
// manipulated the stack. If it's null, that means that there
// must be no entry global on the stack, and therefore no incumbent
// global either.
JSContext *cx = nsContentUtils::GetCurrentJSContextForThread();
if (!cx) {
MOZ_ASSERT(ScriptSettingsStack::EntryGlobal() == nullptr);
return nullptr;
}
// See what the JS engine has to say. If we've got a scripted caller
// override in place, the JS engine will lie to us and pretend that
// there's nothing on the JS stack, which will cause us to check the
// incumbent script stack below.
if (JSObject *global = JS::GetScriptedCallerGlobal(cx)) {
return ClampToSubject(xpc::NativeGlobal(global));
}
// Ok, nothing from the JS engine. Let's use whatever's on the
// explicit stack.
return ClampToSubject(ScriptSettingsStack::IncumbentGlobal());
}
nsIGlobalObject*
GetCurrentGlobal()
{
JSContext *cx = nsContentUtils::GetCurrentJSContextForThread();
if (!cx) {
return nullptr;
}
JSObject *global = JS::CurrentGlobalOrNull(cx);
if (!global) {
return nullptr;
}
return xpc::NativeGlobal(global);
}
nsIPrincipal*
GetWebIDLCallerPrincipal()
{
MOZ_ASSERT(NS_IsMainThread());
ScriptSettingsStackEntry *entry = ScriptSettingsStack::EntryPoint();
// If we have an entry point that is not NoJSAPI, we know it must be an
// AutoEntryScript.
if (!entry || entry->NoJSAPI()) {
return nullptr;
}
AutoEntryScript* aes = static_cast<AutoEntryScript*>(entry);
return aes->mWebIDLCallerPrincipal;
}
bool
IsJSAPIActive()
{
ScriptSettingsStackEntry* topEntry = ScriptSettingsStack::Top();
return topEntry && !topEntry->NoJSAPI();
}
namespace danger {
JSContext*
GetJSContext()
{
return CycleCollectedJSContext::Get()->Context();
}
} // namespace danger
JS::RootingContext*
RootingCx()
{
return CycleCollectedJSContext::Get()->RootingCx();
}
AutoJSAPI::AutoJSAPI()
: ScriptSettingsStackEntry(nullptr, eJSAPI)
, mCx(nullptr)
, mIsMainThread(false) // For lack of anything better
{
}
AutoJSAPI::~AutoJSAPI()
{
if (!mCx) {
// No need to do anything here: we never managed to Init, so can't have an
// exception on our (nonexistent) JSContext. We also don't need to restore
// any state on it. Finally, we never made it to pushing outselves onto the
// ScriptSettingsStack, so shouldn't pop.
MOZ_ASSERT(ScriptSettingsStack::Top() != this);
return;
}
ReportException();
if (mOldWarningReporter.isSome()) {
JS::SetWarningReporter(cx(), mOldWarningReporter.value());
}
// Leave the request before popping.
if (mIsMainThread) {
mAutoRequest.reset();
}
ScriptSettingsStack::Pop(this);
}
void
WarningOnlyErrorReporter(JSContext* aCx, const char* aMessage,
JSErrorReport* aRep);
void
AutoJSAPI::InitInternal(nsIGlobalObject* aGlobalObject, JSObject* aGlobal,
JSContext* aCx, bool aIsMainThread)
{
MOZ_ASSERT(aCx);
MOZ_ASSERT(aCx == danger::GetJSContext());
MOZ_ASSERT(aIsMainThread == NS_IsMainThread());
MOZ_ASSERT(bool(aGlobalObject) == bool(aGlobal));
MOZ_ASSERT_IF(aGlobalObject, aGlobalObject->GetGlobalJSObject() == aGlobal);
#ifdef DEBUG
bool haveException = JS_IsExceptionPending(aCx);
#endif // DEBUG
mCx = aCx;
mIsMainThread = aIsMainThread;
mGlobalObject = aGlobalObject;
if (aIsMainThread) {
// We _could_ just unconditionally emplace mAutoRequest here. It's just not
// needed on worker threads, and we're hoping to kill it on the main thread
// too.
mAutoRequest.emplace(mCx);
}
if (aGlobal) {
JS::ExposeObjectToActiveJS(aGlobal);
}
mAutoNullableCompartment.emplace(mCx, aGlobal);
ScriptSettingsStack::Push(this);
mOldWarningReporter.emplace(JS::GetWarningReporter(aCx));
JS::SetWarningReporter(aCx, WarningOnlyErrorReporter);
#ifdef DEBUG
if (haveException) {
JS::Rooted<JS::Value> exn(aCx);
JS_GetPendingException(aCx, &exn);
JS_ClearPendingException(aCx);
if (exn.isObject()) {
JS::Rooted<JSObject*> exnObj(aCx, &exn.toObject());
nsAutoJSString stack, filename, name, message;
int32_t line;
JS::Rooted<JS::Value> tmp(aCx);
if (!JS_GetProperty(aCx, exnObj, "filename", &tmp)) {
JS_ClearPendingException(aCx);
}
if (tmp.isUndefined()) {
if (!JS_GetProperty(aCx, exnObj, "fileName", &tmp)) {
JS_ClearPendingException(aCx);
}
}
if (!filename.init(aCx, tmp)) {
JS_ClearPendingException(aCx);
}
if (!JS_GetProperty(aCx, exnObj, "stack", &tmp) ||
!stack.init(aCx, tmp)) {
JS_ClearPendingException(aCx);
}
if (!JS_GetProperty(aCx, exnObj, "name", &tmp) ||
!name.init(aCx, tmp)) {
JS_ClearPendingException(aCx);
}
if (!JS_GetProperty(aCx, exnObj, "message", &tmp) ||
!message.init(aCx, tmp)) {
JS_ClearPendingException(aCx);
}
if (!JS_GetProperty(aCx, exnObj, "lineNumber", &tmp) ||
!JS::ToInt32(aCx, tmp, &line)) {
JS_ClearPendingException(aCx);
line = 0;
}
printf_stderr("PREEXISTING EXCEPTION OBJECT: '%s: %s'\n%s:%d\n%s\n",
NS_ConvertUTF16toUTF8(name).get(),
NS_ConvertUTF16toUTF8(message).get(),
NS_ConvertUTF16toUTF8(filename).get(), line,
NS_ConvertUTF16toUTF8(stack).get());
} else {
// It's a primitive... not much we can do other than stringify it.
nsAutoJSString exnStr;
if (!exnStr.init(aCx, exn)) {
JS_ClearPendingException(aCx);
}
printf_stderr("PREEXISTING EXCEPTION PRIMITIVE: %s\n",
NS_ConvertUTF16toUTF8(exnStr).get());
}
MOZ_ASSERT(false, "We had an exception; we should not have");
}
#endif // DEBUG
}
AutoJSAPI::AutoJSAPI(nsIGlobalObject* aGlobalObject,
bool aIsMainThread,
Type aType)
: ScriptSettingsStackEntry(aGlobalObject, aType)
, mIsMainThread(aIsMainThread)
{
MOZ_ASSERT(aGlobalObject);
MOZ_ASSERT(aGlobalObject->GetGlobalJSObject(), "Must have a JS global");
MOZ_ASSERT(aIsMainThread == NS_IsMainThread());
InitInternal(aGlobalObject, aGlobalObject->GetGlobalJSObject(),
danger::GetJSContext(), aIsMainThread);
}
void
AutoJSAPI::Init()
{
MOZ_ASSERT(!mCx, "An AutoJSAPI should only be initialised once");
InitInternal(/* aGlobalObject */ nullptr, /* aGlobal */ nullptr,
danger::GetJSContext(), NS_IsMainThread());
}
bool
AutoJSAPI::Init(nsIGlobalObject* aGlobalObject, JSContext* aCx)
{
MOZ_ASSERT(!mCx, "An AutoJSAPI should only be initialised once");
MOZ_ASSERT(aCx);
if (NS_WARN_IF(!aGlobalObject)) {
return false;
}
JSObject* global = aGlobalObject->GetGlobalJSObject();
if (NS_WARN_IF(!global)) {
return false;
}
InitInternal(aGlobalObject, global, aCx, NS_IsMainThread());
return true;
}
bool
AutoJSAPI::Init(nsIGlobalObject* aGlobalObject)
{
return Init(aGlobalObject, danger::GetJSContext());
}
bool
AutoJSAPI::Init(JSObject* aObject)
{
return Init(xpc::NativeGlobal(aObject));
}
bool
AutoJSAPI::Init(nsPIDOMWindowInner* aWindow, JSContext* aCx)
{
return Init(nsGlobalWindow::Cast(aWindow), aCx);
}
bool
AutoJSAPI::Init(nsPIDOMWindowInner* aWindow)
{
return Init(nsGlobalWindow::Cast(aWindow));
}
bool
AutoJSAPI::Init(nsGlobalWindow* aWindow, JSContext* aCx)
{
return Init(static_cast<nsIGlobalObject*>(aWindow), aCx);
}
bool
AutoJSAPI::Init(nsGlobalWindow* aWindow)
{
return Init(static_cast<nsIGlobalObject*>(aWindow));
}
// Even with autoJSAPIOwnsErrorReporting, the JS engine still sends warning
// reports to the JSErrorReporter as soon as they are generated. These go
// directly to the console, so we can handle them easily here.
//
// Eventually, SpiderMonkey will have a special-purpose callback for warnings
// only.
void
WarningOnlyErrorReporter(JSContext* aCx, const char* aMessage, JSErrorReport* aRep)
{
MOZ_ASSERT(JSREPORT_IS_WARNING(aRep->flags));
if (!NS_IsMainThread()) {
// Reporting a warning on workers is a bit complicated because we have to
// climb our parent chain until we get to the main thread. So go ahead and
// just go through the worker ReportError codepath here.
//
// That said, it feels like we should be able to short-circuit things a bit
// here by posting an appropriate runnable to the main thread directly...
// Worth looking into sometime.
workers::WorkerPrivate* worker = workers::GetWorkerPrivateFromContext(aCx);
MOZ_ASSERT(worker);
worker->ReportError(aCx, aMessage, aRep);
return;
}
RefPtr<xpc::ErrorReport> xpcReport = new xpc::ErrorReport();
nsGlobalWindow* win = xpc::CurrentWindowOrNull(aCx);
if (!win) {
// We run addons in a separate privileged compartment, but if we're in an
// addon compartment we should log warnings to the console of the associated
// DOM Window.
win = xpc::AddonWindowOrNull(JS::CurrentGlobalOrNull(aCx));
}
xpcReport->Init(aRep, aMessage, nsContentUtils::IsCallerChrome(),
win ? win->AsInner()->WindowID() : 0);
xpcReport->LogToConsole();
}
void
AutoJSAPI::ReportException()
{
if (!HasException()) {
return;
}
// AutoJSAPI uses a JSAutoNullableCompartment, and may be in a null
// compartment when the destructor is called. However, the JS engine
// requires us to be in a compartment when we fetch the pending exception.
// In this case, we enter the privileged junk scope and don't dispatch any
// error events.
JS::Rooted<JSObject*> errorGlobal(cx(), JS::CurrentGlobalOrNull(cx()));
if (!errorGlobal) {
if (mIsMainThread) {
errorGlobal = xpc::PrivilegedJunkScope();
} else {
errorGlobal = workers::GetCurrentThreadWorkerGlobal();
}
}
JSAutoCompartment ac(cx(), errorGlobal);
JS::Rooted<JS::Value> exn(cx());
js::ErrorReport jsReport(cx());
if (StealException(&exn) &&
jsReport.init(cx(), exn, js::ErrorReport::WithSideEffects)) {
if (mIsMainThread) {
RefPtr<xpc::ErrorReport> xpcReport = new xpc::ErrorReport();
RefPtr<nsGlobalWindow> win = xpc::WindowGlobalOrNull(errorGlobal);
if (!win) {
// We run addons in a separate privileged compartment, but they still
// expect to trigger the onerror handler of their associated DOM Window.
win = xpc::AddonWindowOrNull(errorGlobal);
}
nsPIDOMWindowInner* inner = win ? win->AsInner() : nullptr;
xpcReport->Init(jsReport.report(), jsReport.message(),
nsContentUtils::IsCallerChrome(),
inner ? inner->WindowID() : 0);
if (inner && jsReport.report()->errorNumber != JSMSG_OUT_OF_MEMORY) {
JS::RootingContext* rcx = JS::RootingContext::get(cx());
DispatchScriptErrorEvent(inner, rcx, xpcReport, exn);
} else {
JS::Rooted<JSObject*> stack(cx(),
xpc::FindExceptionStackForConsoleReport(inner, exn));
xpcReport->LogToConsoleWithStack(stack);
}
} else {
// On a worker, we just use the worker error reporting mechanism and don't
// bother with xpc::ErrorReport. This will ensure that all the right
// events (which are a lot more complicated than in the window case) get
// fired.
workers::WorkerPrivate* worker = workers::GetCurrentThreadWorkerPrivate();
MOZ_ASSERT(worker);
MOZ_ASSERT(worker->GetJSContext() == cx());
// Before invoking ReportError, put the exception back on the context,
// because it may want to put it in its error events and has no other way
// to get hold of it. After we invoke ReportError, clear the exception on
// cx(), just in case ReportError didn't.
JS_SetPendingException(cx(), exn);
worker->ReportError(cx(), jsReport.message(), jsReport.report());
ClearException();
}
} else {
NS_WARNING("OOMed while acquiring uncaught exception from JSAPI");
ClearException();
}
}
bool
AutoJSAPI::PeekException(JS::MutableHandle<JS::Value> aVal)
{
MOZ_ASSERT_IF(mIsMainThread, IsStackTop());
MOZ_ASSERT(HasException());
MOZ_ASSERT(js::GetContextCompartment(cx()));
if (!JS_GetPendingException(cx(), aVal)) {
return false;
}
return true;
}
bool
AutoJSAPI::StealException(JS::MutableHandle<JS::Value> aVal)
{
if (!PeekException(aVal)) {
return false;
}
JS_ClearPendingException(cx());
return true;
}
#ifdef DEBUG
bool
AutoJSAPI::IsStackTop() const
{
return ScriptSettingsStack::TopNonIncumbentScript() == this;
}
#endif // DEBUG
AutoEntryScript::AutoEntryScript(nsIGlobalObject* aGlobalObject,
const char *aReason,
bool aIsMainThread)
: AutoJSAPI(aGlobalObject, aIsMainThread, eEntryScript)
, mWebIDLCallerPrincipal(nullptr)
{
MOZ_ASSERT(aGlobalObject);
if (aIsMainThread && gRunToCompletionListeners > 0) {
mDocShellEntryMonitor.emplace(cx(), aReason);
}
}
AutoEntryScript::AutoEntryScript(JSObject* aObject,
const char *aReason,
bool aIsMainThread)
: AutoEntryScript(xpc::NativeGlobal(aObject), aReason, aIsMainThread)
{
}
AutoEntryScript::~AutoEntryScript()
{
// GC when we pop a script entry point. This is a useful heuristic that helps
// us out on certain (flawed) benchmarks like sunspider, because it lets us
// avoid GCing during the timing loop.
JS_MaybeGC(cx());
}
AutoEntryScript::DocshellEntryMonitor::DocshellEntryMonitor(JSContext* aCx,
const char* aReason)
: JS::dbg::AutoEntryMonitor(aCx)
, mReason(aReason)
{
}
void
AutoEntryScript::DocshellEntryMonitor::Entry(JSContext* aCx, JSFunction* aFunction,
JSScript* aScript, JS::Handle<JS::Value> aAsyncStack,
const char* aAsyncCause)
{
JS::Rooted<JSFunction*> rootedFunction(aCx);
if (aFunction) {
rootedFunction = aFunction;
}
JS::Rooted<JSScript*> rootedScript(aCx);
if (aScript) {
rootedScript = aScript;
}
nsCOMPtr<nsPIDOMWindowInner> window =
do_QueryInterface(xpc::NativeGlobal(JS::CurrentGlobalOrNull(aCx)));
if (!window || !window->GetDocShell() ||
!window->GetDocShell()->GetRecordProfileTimelineMarkers()) {
return;
}
nsCOMPtr<nsIDocShell> docShellForJSRunToCompletion = window->GetDocShell();
nsString filename;
uint32_t lineNumber = 0;
js::AutoStableStringChars functionName(aCx);
if (rootedFunction) {
JS::Rooted<JSString*> displayId(aCx, JS_GetFunctionDisplayId(rootedFunction));
if (displayId) {
if (!functionName.initTwoByte(aCx, displayId)) {
JS_ClearPendingException(aCx);
return;
}
}
}
if (!rootedScript) {
rootedScript = JS_GetFunctionScript(aCx, rootedFunction);
}
if (rootedScript) {
filename = NS_ConvertUTF8toUTF16(JS_GetScriptFilename(rootedScript));
lineNumber = JS_GetScriptBaseLineNumber(aCx, rootedScript);
}
if (!filename.IsEmpty() || functionName.isTwoByte()) {
const char16_t* functionNameChars = functionName.isTwoByte() ?
functionName.twoByteChars() : nullptr;
docShellForJSRunToCompletion->NotifyJSRunToCompletionStart(mReason,
functionNameChars,
filename.BeginReading(),
lineNumber, aAsyncStack,
aAsyncCause);
}
}
void
AutoEntryScript::DocshellEntryMonitor::Exit(JSContext* aCx)
{
nsCOMPtr<nsPIDOMWindowInner> window =
do_QueryInterface(xpc::NativeGlobal(JS::CurrentGlobalOrNull(aCx)));
// Not really worth checking GetRecordProfileTimelineMarkers here.
if (window && window->GetDocShell()) {
nsCOMPtr<nsIDocShell> docShellForJSRunToCompletion = window->GetDocShell();
docShellForJSRunToCompletion->NotifyJSRunToCompletionStop();
}
}
AutoIncumbentScript::AutoIncumbentScript(nsIGlobalObject* aGlobalObject)
: ScriptSettingsStackEntry(aGlobalObject, eIncumbentScript)
, mCallerOverride(nsContentUtils::GetCurrentJSContextForThread())
{
ScriptSettingsStack::Push(this);
}
AutoIncumbentScript::~AutoIncumbentScript()
{
ScriptSettingsStack::Pop(this);
}
AutoNoJSAPI::AutoNoJSAPI()
: ScriptSettingsStackEntry(nullptr, eNoJSAPI)
{
ScriptSettingsStack::Push(this);
}
AutoNoJSAPI::~AutoNoJSAPI()
{
ScriptSettingsStack::Pop(this);
}
} // namespace dom
AutoJSContext::AutoJSContext(MOZ_GUARD_OBJECT_NOTIFIER_ONLY_PARAM_IN_IMPL)
: mCx(nullptr)
{
JS::AutoSuppressGCAnalysis nogc;
MOZ_ASSERT(!mCx, "mCx should not be initialized!");
MOZ_ASSERT(NS_IsMainThread());
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
if (IsJSAPIActive()) {
mCx = danger::GetJSContext();
} else {
mJSAPI.Init();
mCx = mJSAPI.cx();
}
}
AutoJSContext::operator JSContext*() const
{
return mCx;
}
AutoSafeJSContext::AutoSafeJSContext(MOZ_GUARD_OBJECT_NOTIFIER_ONLY_PARAM_IN_IMPL)
: AutoJSAPI()
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
DebugOnly<bool> ok = Init(xpc::UnprivilegedJunkScope());
MOZ_ASSERT(ok,
"This is quite odd. We should have crashed in the "
"xpc::NativeGlobal() call if xpc::UnprivilegedJunkScope() "
"returned null, and inited correctly otherwise!");
}
AutoSlowOperation::AutoSlowOperation(MOZ_GUARD_OBJECT_NOTIFIER_ONLY_PARAM_IN_IMPL)
: AutoJSAPI()
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
Init();
}
void
AutoSlowOperation::CheckForInterrupt()
{
// JS_CheckForInterrupt expects us to be in a compartment.
JSAutoCompartment ac(cx(), xpc::UnprivilegedJunkScope());
JS_CheckForInterrupt(cx());
}
} // namespace mozilla