https://github.com/mozilla/gecko-dev
Tip revision: d3e2548c17483ad494ac5c6e9602355d1559cd64 authored by Ryan VanderMeulen on 16 March 2014, 19:13:43 UTC
Merge b2g18 to v1.1hd. a=merge
Merge b2g18 to v1.1hd. a=merge
Tip revision: d3e2548
nsXPConnect.cpp
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* 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/. */
/* High level class and public functions implementation. */
#include "mozilla/Assertions.h"
#include "mozilla/Base64.h"
#include "mozilla/Util.h"
#include "xpcprivate.h"
#include "XPCWrapper.h"
#include "nsBaseHashtable.h"
#include "nsHashKeys.h"
#include "jsfriendapi.h"
#include "jsgc.h"
#include "dom_quickstubs.h"
#include "nsNullPrincipal.h"
#include "nsIURI.h"
#include "nsJSEnvironment.h"
#include "nsThreadUtils.h"
#include "XrayWrapper.h"
#include "WrapperFactory.h"
#include "AccessCheck.h"
#ifdef MOZ_JSDEBUGGER
#include "jsdIDebuggerService.h"
#endif
#include "XPCQuickStubs.h"
#include "dombindings.h"
#include "mozilla/dom/BindingUtils.h"
#include "mozilla/dom/TextDecoderBinding.h"
#include "mozilla/dom/TextEncoderBinding.h"
#include "nsWrapperCacheInlines.h"
#include "nsDOMMutationObserver.h"
#include "nsICycleCollectorListener.h"
#include "nsThread.h"
using namespace mozilla::dom;
using namespace xpc;
NS_IMPL_THREADSAFE_ISUPPORTS7(nsXPConnect,
nsIXPConnect,
nsISupportsWeakReference,
nsIThreadObserver,
nsIJSRuntimeService,
nsIJSContextStack,
nsIThreadJSContextStack,
nsIJSEngineTelemetryStats)
nsXPConnect* nsXPConnect::gSelf = nullptr;
JSBool nsXPConnect::gOnceAliveNowDead = false;
uint32_t nsXPConnect::gReportAllJSExceptions = 0;
JSBool nsXPConnect::gDebugMode = false;
JSBool nsXPConnect::gDesiredDebugMode = false;
// Global cache of the default script security manager (QI'd to
// nsIScriptSecurityManager)
nsIScriptSecurityManager *nsXPConnect::gScriptSecurityManager = nullptr;
const char XPC_CONTEXT_STACK_CONTRACTID[] = "@mozilla.org/js/xpc/ContextStack;1";
const char XPC_RUNTIME_CONTRACTID[] = "@mozilla.org/js/xpc/RuntimeService;1";
const char XPC_EXCEPTION_CONTRACTID[] = "@mozilla.org/js/xpc/Exception;1";
const char XPC_CONSOLE_CONTRACTID[] = "@mozilla.org/consoleservice;1";
const char XPC_SCRIPT_ERROR_CONTRACTID[] = "@mozilla.org/scripterror;1";
const char XPC_ID_CONTRACTID[] = "@mozilla.org/js/xpc/ID;1";
const char XPC_XPCONNECT_CONTRACTID[] = "@mozilla.org/js/xpc/XPConnect;1";
/***************************************************************************/
nsXPConnect::nsXPConnect()
: mRuntime(nullptr),
mInterfaceInfoManager(do_GetService(NS_INTERFACEINFOMANAGER_SERVICE_CONTRACTID)),
mDefaultSecurityManager(nullptr),
mDefaultSecurityManagerFlags(0),
mShuttingDown(false),
mEventDepth(0),
mCycleCollectionContext(nullptr)
{
mRuntime = XPCJSRuntime::newXPCJSRuntime(this);
nsCycleCollector_registerJSRuntime(this);
char* reportableEnv = PR_GetEnv("MOZ_REPORT_ALL_JS_EXCEPTIONS");
if (reportableEnv && *reportableEnv)
gReportAllJSExceptions = 1;
}
nsXPConnect::~nsXPConnect()
{
nsCycleCollector_forgetJSRuntime();
JSContext *cx = nullptr;
if (mRuntime) {
// Create our own JSContext rather than an XPCCallContext, since
// otherwise we will create a new safe JS context and attach a
// components object that won't get GCed.
cx = JS_NewContext(mRuntime->GetJSRuntime(), 8192);
}
// This needs to happen exactly here, otherwise we leak at shutdown. I don't
// know why. :-(
mRuntime->DestroyJSContextStack();
mShuttingDown = true;
if (cx) {
// XXX Call even if |mRuntime| null?
XPCWrappedNativeScope::SystemIsBeingShutDown();
mRuntime->SystemIsBeingShutDown();
JS_DestroyContext(cx);
}
NS_IF_RELEASE(mDefaultSecurityManager);
gScriptSecurityManager = nullptr;
// shutdown the logging system
XPC_LOG_FINISH();
delete mRuntime;
gSelf = nullptr;
gOnceAliveNowDead = true;
}
// static
nsXPConnect*
nsXPConnect::GetXPConnect()
{
// Do a release-mode assert that we're not doing anything significant in
// XPConnect off the main thread. If you're an extension developer hitting
// this, you need to change your code. See bug 716167.
if (!NS_LIKELY(NS_IsMainThread() || NS_IsCycleCollectorThread()))
MOZ_CRASH();
if (!gSelf) {
if (gOnceAliveNowDead)
return nullptr;
gSelf = new nsXPConnect();
if (!gSelf)
return nullptr;
if (!gSelf->mRuntime) {
NS_RUNTIMEABORT("Couldn't create XPCJSRuntime.");
}
if (!gSelf->mInterfaceInfoManager) {
NS_RUNTIMEABORT("Couldn't get global interface info manager.");
}
// Initial extra ref to keep the singleton alive
// balanced by explicit call to ReleaseXPConnectSingleton()
NS_ADDREF(gSelf);
// Set XPConnect as the main thread observer.
//
// The cycle collector sometimes calls GetXPConnect, but it should never
// be the one that initializes gSelf.
MOZ_ASSERT(NS_IsMainThread());
if (NS_FAILED(nsThread::SetMainThreadObserver(gSelf))) {
NS_RELEASE(gSelf);
// Fall through to returning null
}
}
return gSelf;
}
// static
nsXPConnect*
nsXPConnect::GetSingleton()
{
nsXPConnect* xpc = nsXPConnect::GetXPConnect();
NS_IF_ADDREF(xpc);
return xpc;
}
// static
void
nsXPConnect::ReleaseXPConnectSingleton()
{
nsXPConnect* xpc = gSelf;
if (xpc) {
nsThread::SetMainThreadObserver(nullptr);
#ifdef DEBUG
// force a dump of the JavaScript gc heap if JS is still alive
// if requested through XPC_SHUTDOWN_HEAP_DUMP environment variable
{
const char* dumpName = getenv("XPC_SHUTDOWN_HEAP_DUMP");
if (dumpName) {
FILE* dumpFile = (*dumpName == '\0' ||
strcmp(dumpName, "stdout") == 0)
? stdout
: fopen(dumpName, "w");
if (dumpFile) {
JS_DumpHeap(xpc->GetRuntime()->GetJSRuntime(), dumpFile, nullptr,
JSTRACE_OBJECT, nullptr, static_cast<size_t>(-1), nullptr);
if (dumpFile != stdout)
fclose(dumpFile);
}
}
}
#endif
#ifdef XPC_DUMP_AT_SHUTDOWN
// NOTE: to see really interesting stuff turn on the prlog stuff.
// See the comment at the top of XPCLog.h to see how to do that.
xpc->DebugDump(7);
#endif
nsrefcnt cnt;
NS_RELEASE2(xpc, cnt);
#ifdef XPC_DUMP_AT_SHUTDOWN
if (0 != cnt)
printf("*** dangling reference to nsXPConnect: refcnt=%d\n", cnt);
else
printf("+++ XPConnect had no dangling references.\n");
#endif
}
}
// static
nsresult
nsXPConnect::GetInterfaceInfoManager(nsIInterfaceInfoSuperManager** iim,
nsXPConnect* xpc /*= nullptr*/)
{
if (!xpc && !(xpc = GetXPConnect()))
return NS_ERROR_FAILURE;
*iim = xpc->mInterfaceInfoManager;
NS_IF_ADDREF(*iim);
return NS_OK;
}
// static
XPCJSRuntime*
nsXPConnect::GetRuntimeInstance()
{
nsXPConnect* xpc = GetXPConnect();
NS_ASSERTION(xpc, "Must not be called if XPC failed to initialize");
return xpc->GetRuntime();
}
// static
JSBool
nsXPConnect::IsISupportsDescendant(nsIInterfaceInfo* info)
{
bool found = false;
if (info)
info->HasAncestor(&NS_GET_IID(nsISupports), &found);
return found;
}
/***************************************************************************/
typedef bool (*InfoTester)(nsIInterfaceInfoManager* manager, const void* data,
nsIInterfaceInfo** info);
static bool IIDTester(nsIInterfaceInfoManager* manager, const void* data,
nsIInterfaceInfo** info)
{
return NS_SUCCEEDED(manager->GetInfoForIID((const nsIID *) data, info)) &&
*info;
}
static bool NameTester(nsIInterfaceInfoManager* manager, const void* data,
nsIInterfaceInfo** info)
{
return NS_SUCCEEDED(manager->GetInfoForName((const char *) data, info)) &&
*info;
}
static nsresult FindInfo(InfoTester tester, const void* data,
nsIInterfaceInfoSuperManager* iism,
nsIInterfaceInfo** info)
{
if (tester(iism, data, info))
return NS_OK;
// If not found, then let's ask additional managers.
bool yes;
nsCOMPtr<nsISimpleEnumerator> list;
if (NS_SUCCEEDED(iism->HasAdditionalManagers(&yes)) && yes &&
NS_SUCCEEDED(iism->EnumerateAdditionalManagers(getter_AddRefs(list))) &&
list) {
bool more;
nsCOMPtr<nsIInterfaceInfoManager> current;
while (NS_SUCCEEDED(list->HasMoreElements(&more)) && more &&
NS_SUCCEEDED(list->GetNext(getter_AddRefs(current))) && current) {
if (tester(current, data, info))
return NS_OK;
}
}
return NS_ERROR_NO_INTERFACE;
}
nsresult
nsXPConnect::GetInfoForIID(const nsIID * aIID, nsIInterfaceInfo** info)
{
return FindInfo(IIDTester, aIID, mInterfaceInfoManager, info);
}
nsresult
nsXPConnect::GetInfoForName(const char * name, nsIInterfaceInfo** info)
{
return FindInfo(NameTester, name, mInterfaceInfoManager, info);
}
bool
nsXPConnect::NeedCollect()
{
return !js::AreGCGrayBitsValid(GetRuntime()->GetJSRuntime());
}
void
nsXPConnect::Collect(uint32_t reason)
{
// We're dividing JS objects into 2 categories:
//
// 1. "real" roots, held by the JS engine itself or rooted through the root
// and lock JS APIs. Roots from this category are considered black in the
// cycle collector, any cycle they participate in is uncollectable.
//
// 2. roots held by C++ objects that participate in cycle collection,
// held by XPConnect (see XPCJSRuntime::TraceXPConnectRoots). Roots from
// this category are considered grey in the cycle collector, their final
// color depends on the objects that hold them.
//
// Note that if a root is in both categories it is the fact that it is in
// category 1 that takes precedence, so it will be considered black.
//
// During garbage collection we switch to an additional mark color (gray)
// when tracing inside TraceXPConnectRoots. This allows us to walk those
// roots later on and add all objects reachable only from them to the
// cycle collector.
//
// Phases:
//
// 1. marking of the roots in category 1 by having the JS GC do its marking
// 2. marking of the roots in category 2 by XPCJSRuntime::TraceXPConnectRoots
// using an additional color (gray).
// 3. end of GC, GC can sweep its heap
//
// At some later point, when the cycle collector runs:
//
// 4. walk gray objects and add them to the cycle collector, cycle collect
//
// JS objects that are part of cycles the cycle collector breaks will be
// collected by the next JS.
//
// If WantAllTraces() is false the cycle collector will not traverse roots
// from category 1 or any JS objects held by them. Any JS objects they hold
// will already be marked by the JS GC and will thus be colored black
// themselves. Any C++ objects they hold will have a missing (untraversed)
// edge from the JS object to the C++ object and so it will be marked black
// too. This decreases the number of objects that the cycle collector has to
// deal with.
// To improve debugging, if WantAllTraces() is true all JS objects are
// traversed.
MOZ_ASSERT(reason < js::gcreason::NUM_REASONS);
js::gcreason::Reason gcreason = (js::gcreason::Reason)reason;
JSRuntime *rt = GetRuntime()->GetJSRuntime();
js::PrepareForFullGC(rt);
js::GCForReason(rt, gcreason);
}
NS_IMETHODIMP
nsXPConnect::GarbageCollect(uint32_t reason)
{
Collect(reason);
return NS_OK;
}
struct NoteWeakMapChildrenTracer : public JSTracer
{
NoteWeakMapChildrenTracer(nsCycleCollectionTraversalCallback &cb)
: mCb(cb)
{
}
nsCycleCollectionTraversalCallback &mCb;
bool mTracedAny;
JSObject *mMap;
void *mKey;
void *mKeyDelegate;
};
static void
TraceWeakMappingChild(JSTracer *trc, void **thingp, JSGCTraceKind kind)
{
MOZ_ASSERT(trc->callback == TraceWeakMappingChild);
void *thing = *thingp;
NoteWeakMapChildrenTracer *tracer =
static_cast<NoteWeakMapChildrenTracer *>(trc);
if (kind == JSTRACE_STRING)
return;
if (!xpc_IsGrayGCThing(thing) && !tracer->mCb.WantAllTraces())
return;
if (AddToCCKind(kind)) {
tracer->mCb.NoteWeakMapping(tracer->mMap, tracer->mKey, tracer->mKeyDelegate, thing);
tracer->mTracedAny = true;
} else {
JS_TraceChildren(trc, thing, kind);
}
}
struct NoteWeakMapsTracer : public js::WeakMapTracer
{
NoteWeakMapsTracer(JSRuntime *rt, js::WeakMapTraceCallback cb,
nsCycleCollectionTraversalCallback &cccb)
: js::WeakMapTracer(rt, cb), mCb(cccb), mChildTracer(cccb)
{
JS_TracerInit(&mChildTracer, rt, TraceWeakMappingChild);
}
nsCycleCollectionTraversalCallback &mCb;
NoteWeakMapChildrenTracer mChildTracer;
};
static void
TraceWeakMapping(js::WeakMapTracer *trc, JSObject *m,
void *k, JSGCTraceKind kkind,
void *v, JSGCTraceKind vkind)
{
MOZ_ASSERT(trc->callback == TraceWeakMapping);
NoteWeakMapsTracer *tracer = static_cast<NoteWeakMapsTracer *>(trc);
// If nothing that could be held alive by this entry is marked gray, return.
if ((!k || !xpc_IsGrayGCThing(k)) && MOZ_LIKELY(!tracer->mCb.WantAllTraces())) {
if (!v || !xpc_IsGrayGCThing(v) || vkind == JSTRACE_STRING)
return;
}
// The cycle collector can only properly reason about weak maps if it can
// reason about the liveness of their keys, which in turn requires that
// the key can be represented in the cycle collector graph. All existing
// uses of weak maps use either objects or scripts as keys, which are okay.
MOZ_ASSERT(AddToCCKind(kkind));
// As an emergency fallback for non-debug builds, if the key is not
// representable in the cycle collector graph, we treat it as marked. This
// can cause leaks, but is preferable to ignoring the binding, which could
// cause the cycle collector to free live objects.
if (!AddToCCKind(kkind))
k = nullptr;
JSObject *kdelegate = nullptr;
if (k && kkind == JSTRACE_OBJECT)
kdelegate = js::GetWeakmapKeyDelegate((JSObject *)k);
if (AddToCCKind(vkind)) {
tracer->mCb.NoteWeakMapping(m, k, kdelegate, v);
} else {
tracer->mChildTracer.mTracedAny = false;
tracer->mChildTracer.mMap = m;
tracer->mChildTracer.mKey = k;
tracer->mChildTracer.mKeyDelegate = kdelegate;
if (v && vkind != JSTRACE_STRING)
JS_TraceChildren(&tracer->mChildTracer, v, vkind);
// The delegate could hold alive the key, so report something to the CC
// if we haven't already.
if (!tracer->mChildTracer.mTracedAny && k && xpc_IsGrayGCThing(k) && kdelegate)
tracer->mCb.NoteWeakMapping(m, k, kdelegate, nullptr);
}
}
// This is based on the logic in TraceWeakMapping.
struct FixWeakMappingGrayBitsTracer : public js::WeakMapTracer
{
FixWeakMappingGrayBitsTracer(JSRuntime *rt)
: js::WeakMapTracer(rt, FixWeakMappingGrayBits)
{}
void
FixAll()
{
do {
mAnyMarked = false;
js::TraceWeakMaps(this);
} while (mAnyMarked);
}
private:
static void
FixWeakMappingGrayBits(js::WeakMapTracer *trc, JSObject *m,
void *k, JSGCTraceKind kkind,
void *v, JSGCTraceKind vkind)
{
MOZ_ASSERT(!js::IsIncrementalGCInProgress(trc->runtime),
"Don't call FixWeakMappingGrayBits during a GC.");
FixWeakMappingGrayBitsTracer *tracer = static_cast<FixWeakMappingGrayBitsTracer*>(trc);
// If nothing that could be held alive by this entry is marked gray, return.
bool delegateMightNeedMarking = k && xpc_IsGrayGCThing(k);
bool valueMightNeedMarking = v && xpc_IsGrayGCThing(v) && vkind != JSTRACE_STRING;
if (!delegateMightNeedMarking && !valueMightNeedMarking)
return;
if (!AddToCCKind(kkind))
k = nullptr;
if (delegateMightNeedMarking && kkind == JSTRACE_OBJECT) {
JSObject *kdelegate = js::GetWeakmapKeyDelegate((JSObject *)k);
if (kdelegate && !xpc_IsGrayGCThing(kdelegate)) {
js::UnmarkGrayGCThingRecursively(k, JSTRACE_OBJECT);
tracer->mAnyMarked = true;
}
}
if (v && xpc_IsGrayGCThing(v) &&
(!k || !xpc_IsGrayGCThing(k)) &&
(!m || !xpc_IsGrayGCThing(m)) &&
vkind != JSTRACE_SHAPE)
{
js::UnmarkGrayGCThingRecursively(v, vkind);
tracer->mAnyMarked = true;
}
}
bool mAnyMarked;
};
void
nsXPConnect::FixWeakMappingGrayBits()
{
FixWeakMappingGrayBitsTracer fixer(GetRuntime()->GetJSRuntime());
fixer.FixAll();
}
nsresult
nsXPConnect::BeginCycleCollection(nsCycleCollectionTraversalCallback &cb)
{
// It is important not to call GetSafeJSContext while on the
// cycle-collector thread since this context will be destroyed
// asynchronously and race with the main thread. In particular, we must
// ensure that a context is passed to the XPCCallContext constructor.
JSContext *cx = mRuntime->GetJSCycleCollectionContext();
if (!cx)
return NS_ERROR_OUT_OF_MEMORY;
NS_ASSERTION(!mCycleCollectionContext, "Didn't call FinishTraverse?");
mCycleCollectionContext = new XPCCallContext(NATIVE_CALLER, cx);
if (!mCycleCollectionContext->IsValid()) {
mCycleCollectionContext = nullptr;
return NS_ERROR_FAILURE;
}
static bool gcHasRun = false;
if (!gcHasRun) {
JSRuntime* rt = GetRuntime()->GetJSRuntime();
uint32_t gcNumber = JS_GetGCParameter(rt, JSGC_NUMBER);
if (!gcNumber)
NS_RUNTIMEABORT("Cannot cycle collect if GC has not run first!");
gcHasRun = true;
}
GetRuntime()->AddXPConnectRoots(cb);
NoteWeakMapsTracer trc(GetRuntime()->GetJSRuntime(), TraceWeakMapping, cb);
js::TraceWeakMaps(&trc);
return NS_OK;
}
bool
nsXPConnect::NotifyLeaveMainThread()
{
NS_ABORT_IF_FALSE(NS_IsMainThread(), "Off main thread");
JSRuntime *rt = mRuntime->GetJSRuntime();
if (JS_IsInRequest(rt))
return false;
JS_ClearRuntimeThread(rt);
return true;
}
void
nsXPConnect::NotifyEnterCycleCollectionThread()
{
NS_ABORT_IF_FALSE(!NS_IsMainThread(), "On main thread");
JS_SetRuntimeThread(mRuntime->GetJSRuntime());
}
void
nsXPConnect::NotifyLeaveCycleCollectionThread()
{
NS_ABORT_IF_FALSE(!NS_IsMainThread(), "On main thread");
JS_ClearRuntimeThread(mRuntime->GetJSRuntime());
}
void
nsXPConnect::NotifyEnterMainThread()
{
NS_ABORT_IF_FALSE(NS_IsMainThread(), "Off main thread");
JS_SetRuntimeThread(mRuntime->GetJSRuntime());
}
nsresult
nsXPConnect::FinishTraverse()
{
if (mCycleCollectionContext)
mCycleCollectionContext = nullptr;
return NS_OK;
}
class nsXPConnectParticipant: public nsCycleCollectionParticipant
{
public:
static NS_METHOD RootImpl(void *n)
{
return NS_OK;
}
static NS_METHOD UnlinkImpl(void *n)
{
return NS_OK;
}
static NS_METHOD UnrootImpl(void *n)
{
return NS_OK;
}
static NS_METHOD_(void) UnmarkIfPurpleImpl(void *n)
{
}
static NS_METHOD TraverseImpl(nsXPConnectParticipant *that, void *n,
nsCycleCollectionTraversalCallback &cb);
};
static const CCParticipantVTable<nsXPConnectParticipant>::Type
XPConnect_cycleCollectorGlobal =
{
NS_IMPL_CYCLE_COLLECTION_NATIVE_VTABLE(nsXPConnectParticipant)
};
nsCycleCollectionParticipant *
nsXPConnect::GetParticipant()
{
return XPConnect_cycleCollectorGlobal.GetParticipant();
}
JSBool
xpc_GCThingIsGrayCCThing(void *thing)
{
return AddToCCKind(js_GetGCThingTraceKind(thing)) &&
xpc_IsGrayGCThing(thing);
}
struct TraversalTracer : public JSTracer
{
TraversalTracer(nsCycleCollectionTraversalCallback &aCb) : cb(aCb)
{
}
nsCycleCollectionTraversalCallback &cb;
};
static void
NoteJSChild(JSTracer *trc, void *thing, JSGCTraceKind kind)
{
TraversalTracer *tracer = static_cast<TraversalTracer*>(trc);
// Don't traverse non-gray objects, unless we want all traces.
if (!xpc_IsGrayGCThing(thing) && !tracer->cb.WantAllTraces())
return;
/*
* This function needs to be careful to avoid stack overflow. Normally, when
* AddToCCKind is true, the recursion terminates immediately as we just add
* |thing| to the CC graph. So overflow is only possible when there are long
* chains of non-AddToCCKind GC things. Currently, this only can happen via
* shape parent pointers. The special JSTRACE_SHAPE case below handles
* parent pointers iteratively, rather than recursively, to avoid overflow.
*/
if (AddToCCKind(kind)) {
if (NS_UNLIKELY(tracer->cb.WantDebugInfo())) {
// based on DumpNotify in jsapi.c
if (tracer->debugPrinter) {
char buffer[200];
tracer->debugPrinter(trc, buffer, sizeof(buffer));
tracer->cb.NoteNextEdgeName(buffer);
} else if (tracer->debugPrintIndex != (size_t)-1) {
char buffer[200];
JS_snprintf(buffer, sizeof(buffer), "%s[%lu]",
static_cast<const char *>(tracer->debugPrintArg),
tracer->debugPrintIndex);
tracer->cb.NoteNextEdgeName(buffer);
} else {
tracer->cb.NoteNextEdgeName(static_cast<const char*>(tracer->debugPrintArg));
}
}
tracer->cb.NoteJSChild(thing);
} else if (kind == JSTRACE_SHAPE) {
JS_TraceShapeCycleCollectorChildren(trc, thing);
} else if (kind != JSTRACE_STRING) {
JS_TraceChildren(trc, thing, kind);
}
}
void
xpc_MarkInCCGeneration(nsISupports* aVariant, uint32_t aGeneration)
{
nsCOMPtr<XPCVariant> variant = do_QueryInterface(aVariant);
if (variant) {
variant->SetCCGeneration(aGeneration);
variant->GetJSVal(); // Unmarks gray JSObject.
XPCVariant* weak = variant.get();
variant = nullptr;
if (weak->IsPurple()) {
weak->RemovePurple();
}
}
}
void
xpc_TryUnmarkWrappedGrayObject(nsISupports* aWrappedJS)
{
nsCOMPtr<nsIXPConnectWrappedJS> wjs = do_QueryInterface(aWrappedJS);
if (wjs) {
// Unmarks gray JSObject.
static_cast<nsXPCWrappedJS*>(wjs.get())->GetJSObject();
}
}
static inline void
DescribeGCThing(bool isMarked, void *p, JSGCTraceKind traceKind,
nsCycleCollectionTraversalCallback &cb)
{
if (cb.WantDebugInfo()) {
char name[72];
if (traceKind == JSTRACE_OBJECT) {
JSObject *obj = static_cast<JSObject*>(p);
js::Class *clasp = js::GetObjectClass(obj);
XPCNativeScriptableInfo *si = nullptr;
if (IS_PROTO_CLASS(clasp)) {
XPCWrappedNativeProto *p =
static_cast<XPCWrappedNativeProto*>(xpc_GetJSPrivate(obj));
si = p->GetScriptableInfo();
}
if (si) {
JS_snprintf(name, sizeof(name), "JS Object (%s - %s)",
clasp->name, si->GetJSClass()->name);
} else if (clasp == &js::FunctionClass) {
JSFunction *fun = JS_GetObjectFunction(obj);
JSString *str = JS_GetFunctionId(fun);
if (str) {
NS_ConvertUTF16toUTF8 fname(JS_GetInternedStringChars(str));
JS_snprintf(name, sizeof(name),
"JS Object (Function - %s)", fname.get());
} else {
JS_snprintf(name, sizeof(name), "JS Object (Function)");
}
} else {
JS_snprintf(name, sizeof(name), "JS Object (%s)",
clasp->name);
}
} else {
static const char trace_types[][11] = {
"Object",
"String",
"Script",
"IonCode",
"Xml",
"Shape",
"BaseShape",
"TypeObject",
};
JS_STATIC_ASSERT(NS_ARRAY_LENGTH(trace_types) == JSTRACE_LAST + 1);
JS_snprintf(name, sizeof(name), "JS %s", trace_types[traceKind]);
}
// Disable printing global for objects while we figure out ObjShrink fallout.
cb.DescribeGCedNode(isMarked, name);
} else {
cb.DescribeGCedNode(isMarked, "JS Object");
}
}
static void
NoteJSChildTracerShim(JSTracer *trc, void **thingp, JSGCTraceKind kind)
{
NoteJSChild(trc, *thingp, kind);
}
static inline void
NoteGCThingJSChildren(JSRuntime *rt, void *p, JSGCTraceKind traceKind,
nsCycleCollectionTraversalCallback &cb)
{
MOZ_ASSERT(rt);
TraversalTracer trc(cb);
JS_TracerInit(&trc, rt, NoteJSChildTracerShim);
trc.eagerlyTraceWeakMaps = false;
JS_TraceChildren(&trc, p, traceKind);
}
static inline void
NoteGCThingXPCOMChildren(js::Class *clasp, JSObject *obj,
nsCycleCollectionTraversalCallback &cb)
{
MOZ_ASSERT(clasp);
MOZ_ASSERT(clasp == js::GetObjectClass(obj));
if (clasp == &XPC_WN_Tearoff_JSClass) {
// A tearoff holds a strong reference to its native object
// (see XPCWrappedNative::FlatJSObjectFinalized). Its XPCWrappedNative
// will be held alive through the parent of the JSObject of the tearoff.
XPCWrappedNativeTearOff *to =
static_cast<XPCWrappedNativeTearOff*>(xpc_GetJSPrivate(obj));
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "xpc_GetJSPrivate(obj)->mNative");
cb.NoteXPCOMChild(to->GetNative());
}
// XXX This test does seem fragile, we should probably whitelist classes
// that do hold a strong reference, but that might not be possible.
else if (clasp->flags & JSCLASS_HAS_PRIVATE &&
clasp->flags & JSCLASS_PRIVATE_IS_NSISUPPORTS) {
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "xpc_GetJSPrivate(obj)");
cb.NoteXPCOMChild(static_cast<nsISupports*>(xpc_GetJSPrivate(obj)));
} else if (oldproxybindings::instanceIsProxy(obj)) {
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "js::GetProxyPrivate(obj)");
nsISupports *identity =
static_cast<nsISupports*>(js::GetProxyPrivate(obj).toPrivate());
cb.NoteXPCOMChild(identity);
} else {
nsISupports *identity;
if (UnwrapDOMObjectToISupports(obj, identity)) {
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "UnwrapDOMObject(obj)");
cb.NoteXPCOMChild(identity);
}
}
}
enum TraverseSelect {
TRAVERSE_CPP,
TRAVERSE_FULL
};
static void
TraverseGCThing(TraverseSelect ts, void *p, JSGCTraceKind traceKind,
nsCycleCollectionTraversalCallback &cb)
{
MOZ_ASSERT(traceKind == js_GetGCThingTraceKind(p));
bool isMarkedGray = xpc_IsGrayGCThing(p);
if (ts == TRAVERSE_FULL)
DescribeGCThing(!isMarkedGray, p, traceKind, cb);
// If this object is alive, then all of its children are alive. For JS objects,
// the black-gray invariant ensures the children are also marked black. For C++
// objects, the ref count from this object will keep them alive. Thus we don't
// need to trace our children, unless we are debugging using WantAllTraces.
if (!isMarkedGray && !cb.WantAllTraces())
return;
if (ts == TRAVERSE_FULL)
NoteGCThingJSChildren(nsXPConnect::GetRuntimeInstance()->GetJSRuntime(),
p, traceKind, cb);
if (traceKind == JSTRACE_OBJECT) {
JSObject *obj = static_cast<JSObject*>(p);
NoteGCThingXPCOMChildren(js::GetObjectClass(obj), obj, cb);
}
}
NS_METHOD
nsXPConnectParticipant::TraverseImpl(nsXPConnectParticipant *that, void *p,
nsCycleCollectionTraversalCallback &cb)
{
TraverseGCThing(TRAVERSE_FULL, p, js_GetGCThingTraceKind(p), cb);
return NS_OK;
}
class JSContextParticipant : public nsCycleCollectionParticipant
{
public:
static NS_METHOD RootImpl(void *n)
{
return NS_OK;
}
static NS_METHOD UnlinkImpl(void *n)
{
JSContext *cx = static_cast<JSContext*>(n);
JSAutoRequest ar(cx);
NS_ASSERTION(JS_GetGlobalObject(cx), "global object NULL before unlinking");
JS_SetGlobalObject(cx, NULL);
return NS_OK;
}
static NS_METHOD UnrootImpl(void *n)
{
return NS_OK;
}
static NS_METHOD_(void) UnmarkIfPurpleImpl(void *n)
{
}
static NS_METHOD TraverseImpl(JSContextParticipant *that, void *n,
nsCycleCollectionTraversalCallback &cb)
{
JSContext *cx = static_cast<JSContext*>(n);
// JSContexts do not have an internal refcount and always have a single
// owner (e.g., nsJSContext). Thus, the default refcount is 1. However,
// in the (abnormal) case of synchronous cycle-collection, the context
// may be actively executing code in which case we want to treat it as
// rooted by adding an extra refcount.
unsigned refCount = js::ContextHasOutstandingRequests(cx) ? 2 : 1;
cb.DescribeRefCountedNode(refCount, "JSContext");
if (JSObject *global = JS_GetGlobalObject(cx)) {
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "[global object]");
cb.NoteJSChild(global);
}
return NS_OK;
}
};
static const CCParticipantVTable<JSContextParticipant>::Type
JSContext_cycleCollectorGlobal =
{
NS_IMPL_CYCLE_COLLECTION_NATIVE_VTABLE(JSContextParticipant)
};
// static
nsCycleCollectionParticipant*
nsXPConnect::JSContextParticipant()
{
return JSContext_cycleCollectorGlobal.GetParticipant();
}
NS_IMETHODIMP_(void)
nsXPConnect::NoteJSContext(JSContext *aJSContext,
nsCycleCollectionTraversalCallback &aCb)
{
aCb.NoteNativeChild(aJSContext, JSContext_cycleCollectorGlobal.GetParticipant());
}
/***************************************************************************/
/***************************************************************************/
// nsIXPConnect interface methods...
inline nsresult UnexpectedFailure(nsresult rv)
{
NS_ERROR("This is not supposed to fail!");
return rv;
}
/* void initClasses (in JSContextPtr aJSContext, in JSObjectPtr aGlobalJSObj); */
NS_IMETHODIMP
nsXPConnect::InitClasses(JSContext * aJSContext, JSObject * aGlobalJSObj)
{
NS_ASSERTION(aJSContext, "bad param");
NS_ASSERTION(aGlobalJSObj, "bad param");
// Nest frame chain save/restore in request created by XPCCallContext.
XPCCallContext ccx(NATIVE_CALLER, aJSContext);
if (!ccx.IsValid())
return UnexpectedFailure(NS_ERROR_FAILURE);
JSAutoCompartment ac(ccx, aGlobalJSObj);
XPCWrappedNativeScope* scope =
XPCWrappedNativeScope::GetNewOrUsed(ccx, aGlobalJSObj);
if (!scope)
return UnexpectedFailure(NS_ERROR_FAILURE);
scope->RemoveWrappedNativeProtos();
if (!nsXPCComponents::AttachComponentsObject(ccx, scope))
return UnexpectedFailure(NS_ERROR_FAILURE);
if (!XPCNativeWrapper::AttachNewConstructorObject(ccx, aGlobalJSObj))
return UnexpectedFailure(NS_ERROR_FAILURE);
return NS_OK;
}
static bool
CreateNewGlobal(JSContext *cx, JSClass *clasp, nsIPrincipal *principal,
xpc::CompartmentPrivate *priv, JSObject **global,
JSCompartment **compartment)
{
// We take ownership of |priv|. Ensure that either we free it in the case
// of failure or give ownership to the compartment in case of success (in
// that case it will be free'd in CompartmentCallback during GC).
MOZ_ASSERT(priv);
nsAutoPtr<xpc::CompartmentPrivate> priv_holder(priv);
JSObject *tempGlobal =
JS_NewGlobalObject(cx, clasp, nsJSPrincipals::get(principal));
if (!tempGlobal)
return false;
*global = tempGlobal;
*compartment = js::GetObjectCompartment(tempGlobal);
JS_SetCompartmentPrivate(*compartment, priv_holder.forget());
return true;
}
#ifdef DEBUG
struct VerifyTraceXPCGlobalCalledTracer
{
JSTracer base;
bool ok;
};
static void
VerifyTraceXPCGlobalCalled(JSTracer *trc, void **thingp, JSGCTraceKind kind)
{
// We don't do anything here, we only want to verify that TraceXPCGlobal
// was called.
}
#endif
void
TraceXPCGlobal(JSTracer *trc, JSObject *obj)
{
#ifdef DEBUG
if (trc->callback == VerifyTraceXPCGlobalCalled) {
// We don't do anything here, we only want to verify that TraceXPCGlobal
// was called.
reinterpret_cast<VerifyTraceXPCGlobalCalledTracer*>(trc)->ok = true;
return;
}
#endif
if (XPCWrappedNativeScope *scope = XPCWrappedNativeScope::GetNativeScope(obj))
scope->TraceDOMPrototypes(trc);
mozilla::dom::TraceProtoOrIfaceCache(trc, obj);
}
#ifdef DEBUG
#include "mozilla/Preferences.h"
#include "nsIXULRuntime.h"
static void
CheckTypeInference(JSContext *cx, JSClass *clasp, nsIPrincipal *principal)
{
// Check that the global class isn't whitelisted.
if (strcmp(clasp->name, "Sandbox") ||
strcmp(clasp->name, "nsXBLPrototypeScript compilation scope") ||
strcmp(clasp->name, "nsXULPrototypeScript compilation scope"))
return;
// Check that the pref is on.
if (!mozilla::Preferences::GetBool("javascript.options.typeinference"))
return;
// Check that we're not chrome.
bool isSystem;
nsIScriptSecurityManager* ssm;
ssm = XPCWrapper::GetSecurityManager();
if (NS_FAILED(ssm->IsSystemPrincipal(principal, &isSystem)) || !isSystem)
return;
// Check that safe mode isn't on.
bool safeMode;
nsCOMPtr<nsIXULRuntime> xr = do_GetService("@mozilla.org/xre/runtime;1");
if (!xr) {
NS_WARNING("Couldn't get XUL runtime!");
return;
}
if (NS_FAILED(xr->GetInSafeMode(&safeMode)) || safeMode)
return;
// Finally, do the damn assert.
MOZ_ASSERT(JS_GetOptions(cx) & JSOPTION_TYPE_INFERENCE);
}
#else
#define CheckTypeInference(cx, clasp, principal) {}
#endif
namespace xpc {
nsresult
CreateGlobalObject(JSContext *cx, JSClass *clasp, nsIPrincipal *principal,
bool wantXrays, JSObject **global, JSCompartment **compartment)
{
// Make sure that Type Inference is enabled for everything non-chrome.
// Sandboxes and compilation scopes are exceptions. See bug 744034.
CheckTypeInference(cx, clasp, principal);
NS_ABORT_IF_FALSE(NS_IsMainThread(), "using a principal off the main thread?");
xpc::CompartmentPrivate *priv = new xpc::CompartmentPrivate(wantXrays);
if (!CreateNewGlobal(cx, clasp, principal, priv, global, compartment))
return UnexpectedFailure(NS_ERROR_FAILURE);
XPCCompartmentSet& set = nsXPConnect::GetRuntimeInstance()->GetCompartmentSet();
if (!set.put(*compartment))
return UnexpectedFailure(NS_ERROR_FAILURE);
#ifdef DEBUG
// Verify that the right trace hook is called. Note that this doesn't
// work right for wrapped globals, since the tracing situation there is
// more complicated. Manual inspection shows that they do the right thing.
if (clasp->flags & JSCLASS_XPCONNECT_GLOBAL &&
!((js::Class*)clasp)->ext.isWrappedNative)
{
VerifyTraceXPCGlobalCalledTracer trc;
JS_TracerInit(&trc.base, JS_GetRuntime(cx), VerifyTraceXPCGlobalCalled);
trc.ok = false;
JS_TraceChildren(&trc.base, *global, JSTRACE_OBJECT);
NS_ABORT_IF_FALSE(trc.ok, "Trace hook needs to call TraceXPCGlobal if JSCLASS_XPCONNECT_GLOBAL is set.");
}
#endif
if (clasp->flags & JSCLASS_DOM_GLOBAL) {
AllocateProtoOrIfaceCache(*global);
}
return NS_OK;
}
} // namespace xpc
NS_IMETHODIMP
nsXPConnect::InitClassesWithNewWrappedGlobal(JSContext * aJSContext,
nsISupports *aCOMObj,
nsIPrincipal * aPrincipal,
uint32_t aFlags,
nsIXPConnectJSObjectHolder **_retval)
{
NS_ASSERTION(aJSContext, "bad param");
NS_ASSERTION(aCOMObj, "bad param");
NS_ASSERTION(_retval, "bad param");
// We pass null for the 'extra' pointer during global object creation, so
// we need to have a principal.
MOZ_ASSERT(aPrincipal);
XPCCallContext ccx(NATIVE_CALLER, aJSContext);
// Call into XPCWrappedNative to make a new global object, scope, and global
// prototype.
xpcObjectHelper helper(aCOMObj);
MOZ_ASSERT(helper.GetScriptableFlags() & nsIXPCScriptable::IS_GLOBAL_OBJECT);
nsRefPtr<XPCWrappedNative> wrappedGlobal;
nsresult rv =
XPCWrappedNative::WrapNewGlobal(ccx, helper, aPrincipal,
aFlags & nsIXPConnect::INIT_JS_STANDARD_CLASSES,
getter_AddRefs(wrappedGlobal));
NS_ENSURE_SUCCESS(rv, rv);
// Grab a copy of the global and enter its compartment.
JSObject *global = wrappedGlobal->GetFlatJSObject();
MOZ_ASSERT(!js::GetObjectParent(global));
JSAutoCompartment ac(ccx, global);
if (!(aFlags & nsIXPConnect::OMIT_COMPONENTS_OBJECT)) {
// XPCCallContext gives us an active request needed to save/restore.
if (!nsXPCComponents::AttachComponentsObject(ccx, wrappedGlobal->GetScope()))
return UnexpectedFailure(NS_ERROR_FAILURE);
if (!XPCNativeWrapper::AttachNewConstructorObject(ccx, global))
return UnexpectedFailure(NS_ERROR_FAILURE);
}
// Stuff coming through this path always ends up as a DOM global.
// XXX Someone who knows why we can assert this should re-check
// (after bug 720580).
MOZ_ASSERT(js::GetObjectClass(global)->flags & JSCLASS_DOM_GLOBAL);
// Init WebIDL binding constructors wanted on all XPConnect globals.
if (!TextDecoderBinding::GetProtoObject(aJSContext, global, global) ||
!TextEncoderBinding::GetProtoObject(aJSContext, global, global)) {
return UnexpectedFailure(NS_ERROR_FAILURE);
}
wrappedGlobal.forget(_retval);
return NS_OK;
}
nsresult
xpc_MorphSlimWrapper(JSContext *cx, nsISupports *tomorph)
{
nsWrapperCache *cache;
CallQueryInterface(tomorph, &cache);
if (!cache)
return NS_OK;
JSObject *obj = cache->GetWrapper();
if (!obj || !IS_SLIM_WRAPPER(obj))
return NS_OK;
NS_ENSURE_STATE(MorphSlimWrapper(cx, obj));
return NS_OK;
}
static nsresult
NativeInterface2JSObject(XPCLazyCallContext & lccx,
JSObject * aScope,
nsISupports *aCOMObj,
nsWrapperCache *aCache,
const nsIID * aIID,
bool aAllowWrapping,
jsval *aVal,
nsIXPConnectJSObjectHolder **aHolder)
{
JSAutoCompartment ac(lccx.GetJSContext(), aScope);
nsresult rv;
xpcObjectHelper helper(aCOMObj, aCache);
if (!XPCConvert::NativeInterface2JSObject(lccx, aVal, aHolder, helper, aIID,
nullptr, aAllowWrapping, &rv))
return rv;
#ifdef DEBUG
NS_ASSERTION(aAllowWrapping ||
!xpc::WrapperFactory::IsXrayWrapper(JSVAL_TO_OBJECT(*aVal)),
"Shouldn't be returning a xray wrapper here");
#endif
return NS_OK;
}
/* nsIXPConnectJSObjectHolder wrapNative (in JSContextPtr aJSContext, in JSObjectPtr aScope, in nsISupports aCOMObj, in nsIIDRef aIID); */
NS_IMETHODIMP
nsXPConnect::WrapNative(JSContext * aJSContext,
JSObject * aScope,
nsISupports *aCOMObj,
const nsIID & aIID,
nsIXPConnectJSObjectHolder **aHolder)
{
NS_ASSERTION(aHolder, "bad param");
NS_ASSERTION(aJSContext, "bad param");
NS_ASSERTION(aScope, "bad param");
NS_ASSERTION(aCOMObj, "bad param");
XPCCallContext ccx(NATIVE_CALLER, aJSContext);
if (!ccx.IsValid())
return UnexpectedFailure(NS_ERROR_FAILURE);
XPCLazyCallContext lccx(ccx);
jsval v;
return NativeInterface2JSObject(lccx, aScope, aCOMObj, nullptr, &aIID,
false, &v, aHolder);
}
/* void wrapNativeToJSVal (in JSContextPtr aJSContext, in JSObjectPtr aScope, in nsISupports aCOMObj, in nsIIDPtr aIID, out jsval aVal, out nsIXPConnectJSObjectHolder aHolder); */
NS_IMETHODIMP
nsXPConnect::WrapNativeToJSVal(JSContext * aJSContext,
JSObject * aScope,
nsISupports *aCOMObj,
nsWrapperCache *aCache,
const nsIID * aIID,
bool aAllowWrapping,
jsval *aVal,
nsIXPConnectJSObjectHolder **aHolder)
{
NS_ASSERTION(aJSContext, "bad param");
NS_ASSERTION(aScope, "bad param");
NS_ASSERTION(aCOMObj, "bad param");
if (aHolder)
*aHolder = nullptr;
XPCLazyCallContext lccx(NATIVE_CALLER, aJSContext);
return NativeInterface2JSObject(lccx, aScope, aCOMObj, aCache, aIID,
aAllowWrapping, aVal, aHolder);
}
/* void wrapJS (in JSContextPtr aJSContext, in JSObjectPtr aJSObj, in nsIIDRef aIID, [iid_is (aIID), retval] out nsQIResult result); */
NS_IMETHODIMP
nsXPConnect::WrapJS(JSContext * aJSContext,
JSObject * aJSObj,
const nsIID & aIID,
void * *result)
{
NS_ASSERTION(aJSContext, "bad param");
NS_ASSERTION(aJSObj, "bad param");
NS_ASSERTION(result, "bad param");
*result = nullptr;
XPCCallContext ccx(NATIVE_CALLER, aJSContext);
if (!ccx.IsValid())
return UnexpectedFailure(NS_ERROR_FAILURE);
JSAutoCompartment ac(ccx, aJSObj);
nsresult rv = NS_ERROR_UNEXPECTED;
if (!XPCConvert::JSObject2NativeInterface(ccx, result, aJSObj,
&aIID, nullptr, &rv))
return rv;
return NS_OK;
}
NS_IMETHODIMP
nsXPConnect::JSValToVariant(JSContext *cx,
jsval *aJSVal,
nsIVariant ** aResult)
{
NS_PRECONDITION(aJSVal, "bad param");
NS_PRECONDITION(aResult, "bad param");
*aResult = nullptr;
XPCCallContext ccx(NATIVE_CALLER, cx);
if (!ccx.IsValid())
return NS_ERROR_FAILURE;
*aResult = XPCVariant::newVariant(ccx, *aJSVal);
NS_ENSURE_TRUE(*aResult, NS_ERROR_OUT_OF_MEMORY);
return NS_OK;
}
/* void wrapJSAggregatedToNative (in nsISupports aOuter, in JSContextPtr aJSContext, in JSObjectPtr aJSObj, in nsIIDRef aIID, [iid_is (aIID), retval] out nsQIResult result); */
NS_IMETHODIMP
nsXPConnect::WrapJSAggregatedToNative(nsISupports *aOuter,
JSContext * aJSContext,
JSObject * aJSObj,
const nsIID & aIID,
void * *result)
{
NS_ASSERTION(aOuter, "bad param");
NS_ASSERTION(aJSContext, "bad param");
NS_ASSERTION(aJSObj, "bad param");
NS_ASSERTION(result, "bad param");
*result = nullptr;
XPCCallContext ccx(NATIVE_CALLER, aJSContext);
if (!ccx.IsValid())
return UnexpectedFailure(NS_ERROR_FAILURE);
nsresult rv;
if (!XPCConvert::JSObject2NativeInterface(ccx, result, aJSObj,
&aIID, aOuter, &rv))
return rv;
return NS_OK;
}
/* nsIXPConnectWrappedNative getWrappedNativeOfJSObject (in JSContextPtr aJSContext, in JSObjectPtr aJSObj); */
NS_IMETHODIMP
nsXPConnect::GetWrappedNativeOfJSObject(JSContext * aJSContext,
JSObject * aJSObj,
nsIXPConnectWrappedNative **_retval)
{
NS_ASSERTION(aJSContext, "bad param");
NS_ASSERTION(aJSObj, "bad param");
NS_ASSERTION(_retval, "bad param");
XPCCallContext ccx(NATIVE_CALLER, aJSContext);
if (!ccx.IsValid())
return UnexpectedFailure(NS_ERROR_FAILURE);
SLIM_LOG_WILL_MORPH(aJSContext, aJSObj);
nsIXPConnectWrappedNative* wrapper =
XPCWrappedNative::GetAndMorphWrappedNativeOfJSObject(aJSContext, aJSObj);
if (wrapper) {
NS_ADDREF(wrapper);
*_retval = wrapper;
return NS_OK;
}
// else...
*_retval = nullptr;
return NS_ERROR_FAILURE;
}
/* nsISupports getNativeOfWrapper(in JSContextPtr aJSContext, in JSObjectPtr aJSObj); */
NS_IMETHODIMP_(nsISupports*)
nsXPConnect::GetNativeOfWrapper(JSContext * aJSContext,
JSObject * aJSObj)
{
NS_ASSERTION(aJSContext, "bad param");
NS_ASSERTION(aJSObj, "bad param");
XPCCallContext ccx(NATIVE_CALLER, aJSContext);
if (!ccx.IsValid()) {
UnexpectedFailure(NS_ERROR_FAILURE);
return nullptr;
}
JSObject* obj2 = nullptr;
nsIXPConnectWrappedNative* wrapper =
XPCWrappedNative::GetWrappedNativeOfJSObject(aJSContext, aJSObj, nullptr,
&obj2);
if (wrapper)
return wrapper->Native();
if (obj2)
return (nsISupports*)xpc_GetJSPrivate(obj2);
if (mozilla::dom::IsDOMProxy(aJSObj) ||
mozilla::dom::oldproxybindings::instanceIsProxy(aJSObj)) {
// FIXME: Provide a fast non-refcounting way to get the canonical
// nsISupports from the proxy.
nsISupports *supports =
static_cast<nsISupports*>(js::GetProxyPrivate(aJSObj).toPrivate());
nsCOMPtr<nsISupports> canonical = do_QueryInterface(supports);
return canonical.get();
}
nsISupports* supports = nullptr;
if (mozilla::dom::UnwrapDOMObjectToISupports(aJSObj, supports))
return supports;
return nullptr;
}
/* JSObjectPtr getJSObjectOfWrapper (in JSContextPtr aJSContext, in JSObjectPtr aJSObj); */
NS_IMETHODIMP
nsXPConnect::GetJSObjectOfWrapper(JSContext * aJSContext,
JSObject * aJSObj,
JSObject **_retval)
{
NS_ASSERTION(aJSContext, "bad param");
NS_ASSERTION(aJSObj, "bad param");
NS_ASSERTION(_retval, "bad param");
XPCCallContext ccx(NATIVE_CALLER, aJSContext);
if (!ccx.IsValid())
return UnexpectedFailure(NS_ERROR_FAILURE);
JSObject* obj2 = nullptr;
nsIXPConnectWrappedNative* wrapper =
XPCWrappedNative::GetWrappedNativeOfJSObject(aJSContext, aJSObj, nullptr,
&obj2);
if (wrapper) {
wrapper->GetJSObject(_retval);
return NS_OK;
}
if (obj2) {
*_retval = obj2;
return NS_OK;
}
if (mozilla::dom::IsDOMProxy(aJSObj) ||
mozilla::dom::oldproxybindings::instanceIsProxy(aJSObj)) {
*_retval = aJSObj;
return NS_OK;
}
// else...
*_retval = nullptr;
return NS_ERROR_FAILURE;
}
/* nsIXPConnectWrappedNative getWrappedNativeOfNativeObject (in JSContextPtr aJSContext, in JSObjectPtr aScope, in nsISupports aCOMObj, in nsIIDRef aIID); */
NS_IMETHODIMP
nsXPConnect::GetWrappedNativeOfNativeObject(JSContext * aJSContext,
JSObject * aScope,
nsISupports *aCOMObj,
const nsIID & aIID,
nsIXPConnectWrappedNative **_retval)
{
NS_ASSERTION(aJSContext, "bad param");
NS_ASSERTION(aScope, "bad param");
NS_ASSERTION(aCOMObj, "bad param");
NS_ASSERTION(_retval, "bad param");
*_retval = nullptr;
XPCCallContext ccx(NATIVE_CALLER, aJSContext);
if (!ccx.IsValid())
return UnexpectedFailure(NS_ERROR_FAILURE);
XPCWrappedNativeScope* scope =
XPCWrappedNativeScope::FindInJSObjectScope(ccx, aScope);
if (!scope)
return UnexpectedFailure(NS_ERROR_FAILURE);
AutoMarkingNativeInterfacePtr iface(ccx);
iface = XPCNativeInterface::GetNewOrUsed(ccx, &aIID);
if (!iface)
return NS_ERROR_FAILURE;
XPCWrappedNative* wrapper;
nsresult rv = XPCWrappedNative::GetUsedOnly(ccx, aCOMObj, scope, iface,
&wrapper);
if (NS_FAILED(rv))
return NS_ERROR_FAILURE;
*_retval = static_cast<nsIXPConnectWrappedNative*>(wrapper);
return NS_OK;
}
/* nsIXPConnectJSObjectHolder reparentWrappedNativeIfFound (in JSContextPtr aJSContext, in JSObjectPtr aScope, in JSObjectPtr aNewParent, in nsISupports aCOMObj); */
NS_IMETHODIMP
nsXPConnect::ReparentWrappedNativeIfFound(JSContext * aJSContext,
JSObject * aScope,
JSObject * aNewParent,
nsISupports *aCOMObj,
nsIXPConnectJSObjectHolder **_retval)
{
XPCCallContext ccx(NATIVE_CALLER, aJSContext);
if (!ccx.IsValid())
return UnexpectedFailure(NS_ERROR_FAILURE);
XPCWrappedNativeScope* scope =
XPCWrappedNativeScope::FindInJSObjectScope(ccx, aScope);
if (!scope)
return UnexpectedFailure(NS_ERROR_FAILURE);
XPCWrappedNativeScope* scope2 =
XPCWrappedNativeScope::FindInJSObjectScope(ccx, aNewParent);
if (!scope2)
return UnexpectedFailure(NS_ERROR_FAILURE);
return XPCWrappedNative::
ReparentWrapperIfFound(ccx, scope, scope2, aNewParent, aCOMObj,
(XPCWrappedNative**) _retval);
}
static JSDHashOperator
MoveableWrapperFinder(JSDHashTable *table, JSDHashEntryHdr *hdr,
uint32_t number, void *arg)
{
nsTArray<nsRefPtr<XPCWrappedNative> > *array =
static_cast<nsTArray<nsRefPtr<XPCWrappedNative> > *>(arg);
XPCWrappedNative *wn = ((Native2WrappedNativeMap::Entry*)hdr)->value;
// If a wrapper is expired, then there are no references to it from JS, so
// we don't have to move it.
if (!wn->IsWrapperExpired())
array->AppendElement(wn);
return JS_DHASH_NEXT;
}
static nsresult
MoveWrapper(XPCCallContext& ccx, XPCWrappedNative *wrapper,
XPCWrappedNativeScope *newScope, XPCWrappedNativeScope *oldScope)
{
// First, check to see if this wrapper really needs to be
// reparented.
if (wrapper->GetScope() == newScope) {
// The wrapper already got moved, nothing to do here.
return NS_OK;
}
// For performance reasons, we wait to fix up orphaned wrappers (wrappers
// whose parents have moved to another scope) until right before they
// threaten to confuse us.
//
// If this wrapper is an orphan, reunite it with its parent. If, following
// that, the wrapper is no longer in the old scope, then we don't need to
// reparent it.
MOZ_ASSERT(wrapper->GetScope() == oldScope);
nsresult rv = wrapper->RescueOrphans(ccx);
NS_ENSURE_SUCCESS(rv, rv);
if (wrapper->GetScope() != oldScope)
return NS_OK;
nsISupports *identity = wrapper->GetIdentityObject();
nsCOMPtr<nsIClassInfo> info(do_QueryInterface(identity));
// ClassInfo is implemented as singleton objects. If the identity
// object here is the same object as returned by the QI, then it
// is the singleton classinfo, so we don't need to reparent it.
if (SameCOMIdentity(identity, info))
info = nullptr;
if (!info)
return NS_OK;
XPCNativeScriptableCreateInfo sciProto;
XPCNativeScriptableCreateInfo sci;
const XPCNativeScriptableCreateInfo& sciWrapper =
XPCWrappedNative::GatherScriptableCreateInfo(identity, info,
sciProto, sci);
// If the wrapper doesn't want precreate, then we don't need to
// worry about reparenting it.
if (!sciWrapper.GetFlags().WantPreCreate())
return NS_OK;
JSObject *newParent = oldScope->GetGlobalJSObject();
rv = sciWrapper.GetCallback()->PreCreate(identity, ccx,
newParent,
&newParent);
if (NS_FAILED(rv))
return rv;
if (newParent == oldScope->GetGlobalJSObject()) {
// The old scope still works for this wrapper. We have to
// assume that the wrapper will continue to return the old
// scope from PreCreate, so don't move it.
return NS_OK;
}
// These are pretty special circumstances. Make sure that the parent here
// is a bonafide WN with a proper parent chain.
MOZ_ASSERT(!js::IsCrossCompartmentWrapper(newParent));
MOZ_ASSERT(IS_WRAPPER_CLASS(js::GetObjectClass(newParent)));
if (!IS_WN_WRAPPER_OBJECT(newParent))
NS_ENSURE_STATE(MorphSlimWrapper(ccx, newParent));
XPCWrappedNative *parentWrapper =
static_cast<XPCWrappedNative*>(js::GetObjectPrivate(newParent));
rv = parentWrapper->RescueOrphans(ccx);
NS_ENSURE_SUCCESS(rv, rv);
// The wrapper returned a new parent. If the new parent is in a
// different scope, then we need to reparent it, otherwise, the
// old scope is fine.
XPCWrappedNativeScope *betterScope = parentWrapper->GetScope();
if (betterScope == oldScope) {
// The wrapper asked for a different object, but that object
// was in the same scope. This means that the new parent
// simply hasn't been reparented yet, so reparent it first,
// and then continue reparenting the wrapper itself.
rv = MoveWrapper(ccx, parentWrapper, newScope, oldScope);
NS_ENSURE_SUCCESS(rv, rv);
// If the parent wanted to stay in the old scope, we have to stay with
// it. This can happen when doing document.write when the old detached
// about:blank document is still floating around in the scope. Leave it
// behind to die.
if (parentWrapper->GetScope() == oldScope)
return NS_OK;
NS_ASSERTION(parentWrapper->GetScope() == newScope,
"A _third_ scope? Oh dear...");
} else
NS_ASSERTION(betterScope == newScope, "Weird scope returned");
// Now, reparent the wrapper, since we know that it wants to be
// reparented.
nsRefPtr<XPCWrappedNative> junk;
rv = XPCWrappedNative::ReparentWrapperIfFound(ccx, oldScope,
newScope, parentWrapper->GetFlatJSObject(),
wrapper->GetIdentityObject(),
getter_AddRefs(junk));
return rv;
}
/* void moveWrappers(in JSContextPtr aJSContext, in JSObjectPtr aOldScope, in JSObjectPtr aNewScope); */
NS_IMETHODIMP
nsXPConnect::MoveWrappers(JSContext *aJSContext,
JSObject *aOldScope,
JSObject *aNewScope)
{
XPCCallContext ccx(NATIVE_CALLER, aJSContext);
if (!ccx.IsValid())
return UnexpectedFailure(NS_ERROR_FAILURE);
XPCWrappedNativeScope *oldScope =
XPCWrappedNativeScope::FindInJSObjectScope(ccx, aOldScope);
if (!oldScope)
return UnexpectedFailure(NS_ERROR_FAILURE);
XPCWrappedNativeScope *newScope =
XPCWrappedNativeScope::FindInJSObjectScope(ccx, aNewScope);
if (!newScope)
return UnexpectedFailure(NS_ERROR_FAILURE);
// First, look through the old scope and find all of the wrappers that
// we're going to move.
nsTArray<nsRefPtr<XPCWrappedNative> > wrappersToMove;
{ // scoped lock
XPCAutoLock lock(GetRuntime()->GetMapLock());
Native2WrappedNativeMap *map = oldScope->GetWrappedNativeMap();
wrappersToMove.SetCapacity(map->Count());
map->Enumerate(MoveableWrapperFinder, &wrappersToMove);
}
// Now that we have the wrappers, reparent them to the new scope.
for (uint32_t i = 0, stop = wrappersToMove.Length(); i < stop; ++i) {
nsresult rv = MoveWrapper(ccx, wrappersToMove[i], newScope, oldScope);
NS_ENSURE_SUCCESS(rv, rv);
}
return NS_OK;
}
/* void setSecurityManagerForJSContext (in JSContextPtr aJSContext, in nsIXPCSecurityManager aManager, in uint16_t flags); */
NS_IMETHODIMP
nsXPConnect::SetSecurityManagerForJSContext(JSContext * aJSContext,
nsIXPCSecurityManager *aManager,
uint16_t flags)
{
NS_ASSERTION(aJSContext, "bad param");
XPCCallContext ccx(NATIVE_CALLER, aJSContext);
if (!ccx.IsValid())
return UnexpectedFailure(NS_ERROR_FAILURE);
XPCContext* xpcc = ccx.GetXPCContext();
NS_IF_ADDREF(aManager);
nsIXPCSecurityManager* oldManager = xpcc->GetSecurityManager();
NS_IF_RELEASE(oldManager);
xpcc->SetSecurityManager(aManager);
xpcc->SetSecurityManagerFlags(flags);
return NS_OK;
}
/* void getSecurityManagerForJSContext (in JSContextPtr aJSContext, out nsIXPCSecurityManager aManager, out uint16_t flags); */
NS_IMETHODIMP
nsXPConnect::GetSecurityManagerForJSContext(JSContext * aJSContext,
nsIXPCSecurityManager **aManager,
uint16_t *flags)
{
NS_ASSERTION(aJSContext, "bad param");
NS_ASSERTION(aManager, "bad param");
NS_ASSERTION(flags, "bad param");
XPCCallContext ccx(NATIVE_CALLER, aJSContext);
if (!ccx.IsValid())
return UnexpectedFailure(NS_ERROR_FAILURE);
XPCContext* xpcc = ccx.GetXPCContext();
nsIXPCSecurityManager* manager = xpcc->GetSecurityManager();
NS_IF_ADDREF(manager);
*aManager = manager;
*flags = xpcc->GetSecurityManagerFlags();
return NS_OK;
}
/* void setDefaultSecurityManager (in nsIXPCSecurityManager aManager, in uint16_t flags); */
NS_IMETHODIMP
nsXPConnect::SetDefaultSecurityManager(nsIXPCSecurityManager *aManager,
uint16_t flags)
{
NS_IF_ADDREF(aManager);
NS_IF_RELEASE(mDefaultSecurityManager);
mDefaultSecurityManager = aManager;
mDefaultSecurityManagerFlags = flags;
nsCOMPtr<nsIScriptSecurityManager> ssm =
do_QueryInterface(mDefaultSecurityManager);
// Remember the result of the above QI for fast access to the
// script securityt manager.
gScriptSecurityManager = ssm;
return NS_OK;
}
/* void getDefaultSecurityManager (out nsIXPCSecurityManager aManager, out uint16_t flags); */
NS_IMETHODIMP
nsXPConnect::GetDefaultSecurityManager(nsIXPCSecurityManager **aManager,
uint16_t *flags)
{
NS_ASSERTION(aManager, "bad param");
NS_ASSERTION(flags, "bad param");
NS_IF_ADDREF(mDefaultSecurityManager);
*aManager = mDefaultSecurityManager;
*flags = mDefaultSecurityManagerFlags;
return NS_OK;
}
/* nsIStackFrame createStackFrameLocation (in uint32_t aLanguage, in string aFilename, in string aFunctionName, in int32_t aLineNumber, in nsIStackFrame aCaller); */
NS_IMETHODIMP
nsXPConnect::CreateStackFrameLocation(uint32_t aLanguage,
const char *aFilename,
const char *aFunctionName,
int32_t aLineNumber,
nsIStackFrame *aCaller,
nsIStackFrame **_retval)
{
NS_ASSERTION(_retval, "bad param");
return XPCJSStack::CreateStackFrameLocation(aLanguage,
aFilename,
aFunctionName,
aLineNumber,
aCaller,
_retval);
}
/* readonly attribute nsIStackFrame CurrentJSStack; */
NS_IMETHODIMP
nsXPConnect::GetCurrentJSStack(nsIStackFrame * *aCurrentJSStack)
{
NS_ASSERTION(aCurrentJSStack, "bad param");
*aCurrentJSStack = nullptr;
JSContext* cx;
// is there a current context available?
if (NS_SUCCEEDED(Peek(&cx)) && cx) {
nsCOMPtr<nsIStackFrame> stack;
XPCJSStack::CreateStack(cx, getter_AddRefs(stack));
if (stack) {
// peel off native frames...
uint32_t language;
nsCOMPtr<nsIStackFrame> caller;
while (stack &&
NS_SUCCEEDED(stack->GetLanguage(&language)) &&
language != nsIProgrammingLanguage::JAVASCRIPT &&
NS_SUCCEEDED(stack->GetCaller(getter_AddRefs(caller))) &&
caller) {
stack = caller;
}
NS_IF_ADDREF(*aCurrentJSStack = stack);
}
}
return NS_OK;
}
/* readonly attribute nsIXPCNativeCallContext CurrentNativeCallContext; */
NS_IMETHODIMP
nsXPConnect::GetCurrentNativeCallContext(nsAXPCNativeCallContext * *aCurrentNativeCallContext)
{
NS_ASSERTION(aCurrentNativeCallContext, "bad param");
*aCurrentNativeCallContext = XPCJSRuntime::Get()->GetCallContext();
return NS_OK;
}
NS_IMETHODIMP
nsXPConnect::SyncJSContexts(void)
{
// Do-nothing compatibility function
return NS_OK;
}
/* void setFunctionThisTranslator (in nsIIDRef aIID, in nsIXPCFunctionThisTranslator aTranslator); */
NS_IMETHODIMP
nsXPConnect::SetFunctionThisTranslator(const nsIID & aIID,
nsIXPCFunctionThisTranslator *aTranslator)
{
XPCJSRuntime* rt = GetRuntime();
IID2ThisTranslatorMap* map = rt->GetThisTranslatorMap();
{
XPCAutoLock lock(rt->GetMapLock()); // scoped lock
map->Add(aIID, aTranslator);
}
return NS_OK;
}
/* void clearAllWrappedNativeSecurityPolicies (); */
NS_IMETHODIMP
nsXPConnect::ClearAllWrappedNativeSecurityPolicies()
{
XPCCallContext ccx(NATIVE_CALLER);
if (!ccx.IsValid())
return UnexpectedFailure(NS_ERROR_FAILURE);
return XPCWrappedNativeScope::ClearAllWrappedNativeSecurityPolicies(ccx);
}
NS_IMETHODIMP
nsXPConnect::CreateSandbox(JSContext *cx, nsIPrincipal *principal,
nsIXPConnectJSObjectHolder **_retval)
{
XPCCallContext ccx(NATIVE_CALLER, cx);
if (!ccx.IsValid())
return UnexpectedFailure(NS_ERROR_FAILURE);
*_retval = nullptr;
jsval rval = JSVAL_VOID;
AUTO_MARK_JSVAL(ccx, &rval);
SandboxOptions options;
nsresult rv = xpc_CreateSandboxObject(cx, &rval, principal, options);
NS_ASSERTION(NS_FAILED(rv) || !JSVAL_IS_PRIMITIVE(rval),
"Bad return value from xpc_CreateSandboxObject()!");
if (NS_SUCCEEDED(rv) && !JSVAL_IS_PRIMITIVE(rval)) {
*_retval = XPCJSObjectHolder::newHolder(ccx, JSVAL_TO_OBJECT(rval));
NS_ENSURE_TRUE(*_retval, NS_ERROR_OUT_OF_MEMORY);
NS_ADDREF(*_retval);
}
return rv;
}
NS_IMETHODIMP
nsXPConnect::EvalInSandboxObject(const nsAString& source, JSContext *cx,
nsIXPConnectJSObjectHolder *sandbox,
bool returnStringOnly, jsval *rval)
{
if (!sandbox)
return NS_ERROR_INVALID_ARG;
JSObject *obj;
nsresult rv = sandbox->GetJSObject(&obj);
NS_ENSURE_SUCCESS(rv, rv);
return xpc_EvalInSandbox(cx, obj, source,
NS_ConvertUTF16toUTF8(source).get(), 1,
JSVERSION_DEFAULT, returnStringOnly, rval);
}
/* nsIXPConnectJSObjectHolder getWrappedNativePrototype (in JSContextPtr aJSContext, in JSObjectPtr aScope, in nsIClassInfo aClassInfo); */
NS_IMETHODIMP
nsXPConnect::GetWrappedNativePrototype(JSContext * aJSContext,
JSObject * aScope,
nsIClassInfo *aClassInfo,
nsIXPConnectJSObjectHolder **_retval)
{
XPCCallContext ccx(NATIVE_CALLER, aJSContext);
if (!ccx.IsValid())
return UnexpectedFailure(NS_ERROR_FAILURE);
JSAutoCompartment ac(aJSContext, aScope);
XPCWrappedNativeScope* scope =
XPCWrappedNativeScope::FindInJSObjectScope(ccx, aScope);
if (!scope)
return UnexpectedFailure(NS_ERROR_FAILURE);
XPCNativeScriptableCreateInfo sciProto;
XPCWrappedNative::GatherProtoScriptableCreateInfo(aClassInfo, sciProto);
AutoMarkingWrappedNativeProtoPtr proto(ccx);
proto = XPCWrappedNativeProto::GetNewOrUsed(ccx, scope, aClassInfo, &sciProto);
if (!proto)
return UnexpectedFailure(NS_ERROR_FAILURE);
nsIXPConnectJSObjectHolder* holder;
*_retval = holder = XPCJSObjectHolder::newHolder(ccx,
proto->GetJSProtoObject());
if (!holder)
return UnexpectedFailure(NS_ERROR_FAILURE);
NS_ADDREF(holder);
return NS_OK;
}
/* void releaseJSContext (in JSContextPtr aJSContext, in bool noGC); */
NS_IMETHODIMP
nsXPConnect::ReleaseJSContext(JSContext * aJSContext, bool noGC)
{
NS_ASSERTION(aJSContext, "bad param");
XPCCallContext* ccx = nullptr;
for (XPCCallContext* cur = GetRuntime()->GetCallContext();
cur;
cur = cur->GetPrevCallContext()) {
if (cur->GetJSContext() == aJSContext) {
ccx = cur;
// Keep looping to find the deepest matching call context.
}
}
if (ccx) {
#ifdef DEBUG_xpc_hacker
printf("!xpc - deferring destruction of JSContext @ %p\n",
(void *)aJSContext);
#endif
ccx->SetDestroyJSContextInDestructor(true);
return NS_OK;
}
// else continue on and synchronously destroy the JSContext ...
NS_ASSERTION(!XPCJSRuntime::Get()->GetJSContextStack()->
DEBUG_StackHasJSContext(aJSContext),
"JSContext still in threadjscontextstack!");
if (noGC)
JS_DestroyContextNoGC(aJSContext);
else
JS_DestroyContext(aJSContext);
return NS_OK;
}
/* void debugDump (in short depth); */
NS_IMETHODIMP
nsXPConnect::DebugDump(int16_t depth)
{
#ifdef DEBUG
depth-- ;
XPC_LOG_ALWAYS(("nsXPConnect @ %x with mRefCnt = %d", this, mRefCnt.get()));
XPC_LOG_INDENT();
XPC_LOG_ALWAYS(("gSelf @ %x", gSelf));
XPC_LOG_ALWAYS(("gOnceAliveNowDead is %d", (int)gOnceAliveNowDead));
XPC_LOG_ALWAYS(("mDefaultSecurityManager @ %x", mDefaultSecurityManager));
XPC_LOG_ALWAYS(("mDefaultSecurityManagerFlags of %x", mDefaultSecurityManagerFlags));
XPC_LOG_ALWAYS(("mInterfaceInfoManager @ %x", mInterfaceInfoManager.get()));
if (mRuntime) {
if (depth)
mRuntime->DebugDump(depth);
else
XPC_LOG_ALWAYS(("XPCJSRuntime @ %x", mRuntime));
} else
XPC_LOG_ALWAYS(("mRuntime is null"));
XPCWrappedNativeScope::DebugDumpAllScopes(depth);
XPC_LOG_OUTDENT();
#endif
return NS_OK;
}
/* void debugDumpObject (in nsISupports aCOMObj, in short depth); */
NS_IMETHODIMP
nsXPConnect::DebugDumpObject(nsISupports *p, int16_t depth)
{
#ifdef DEBUG
if (!depth)
return NS_OK;
if (!p) {
XPC_LOG_ALWAYS(("*** Cound not dump object with NULL address"));
return NS_OK;
}
nsIXPConnect* xpc;
nsIXPCWrappedJSClass* wjsc;
nsIXPConnectWrappedNative* wn;
nsIXPConnectWrappedJS* wjs;
if (NS_SUCCEEDED(p->QueryInterface(NS_GET_IID(nsIXPConnect),
(void**)&xpc))) {
XPC_LOG_ALWAYS(("Dumping a nsIXPConnect..."));
xpc->DebugDump(depth);
NS_RELEASE(xpc);
} else if (NS_SUCCEEDED(p->QueryInterface(NS_GET_IID(nsIXPCWrappedJSClass),
(void**)&wjsc))) {
XPC_LOG_ALWAYS(("Dumping a nsIXPCWrappedJSClass..."));
wjsc->DebugDump(depth);
NS_RELEASE(wjsc);
} else if (NS_SUCCEEDED(p->QueryInterface(NS_GET_IID(nsIXPConnectWrappedNative),
(void**)&wn))) {
XPC_LOG_ALWAYS(("Dumping a nsIXPConnectWrappedNative..."));
wn->DebugDump(depth);
NS_RELEASE(wn);
} else if (NS_SUCCEEDED(p->QueryInterface(NS_GET_IID(nsIXPConnectWrappedJS),
(void**)&wjs))) {
XPC_LOG_ALWAYS(("Dumping a nsIXPConnectWrappedJS..."));
wjs->DebugDump(depth);
NS_RELEASE(wjs);
} else
XPC_LOG_ALWAYS(("*** Could not dump the nsISupports @ %x", p));
#endif
return NS_OK;
}
/* void debugDumpJSStack (in bool showArgs, in bool showLocals, in bool showThisProps); */
NS_IMETHODIMP
nsXPConnect::DebugDumpJSStack(bool showArgs,
bool showLocals,
bool showThisProps)
{
JSContext* cx;
if (NS_FAILED(Peek(&cx)))
printf("failed to peek into nsIThreadJSContextStack service!\n");
else if (!cx)
printf("there is no JSContext on the nsIThreadJSContextStack!\n");
else
xpc_DumpJSStack(cx, showArgs, showLocals, showThisProps);
return NS_OK;
}
char*
nsXPConnect::DebugPrintJSStack(bool showArgs,
bool showLocals,
bool showThisProps)
{
JSContext* cx;
if (NS_FAILED(Peek(&cx)))
printf("failed to peek into nsIThreadJSContextStack service!\n");
else if (!cx)
printf("there is no JSContext on the nsIThreadJSContextStack!\n");
else
return xpc_PrintJSStack(cx, showArgs, showLocals, showThisProps);
return nullptr;
}
/* void debugDumpEvalInJSStackFrame (in uint32_t aFrameNumber, in string aSourceText); */
NS_IMETHODIMP
nsXPConnect::DebugDumpEvalInJSStackFrame(uint32_t aFrameNumber, const char *aSourceText)
{
JSContext* cx;
if (NS_FAILED(Peek(&cx)))
printf("failed to peek into nsIThreadJSContextStack service!\n");
else if (!cx)
printf("there is no JSContext on the nsIThreadJSContextStack!\n");
else
xpc_DumpEvalInJSStackFrame(cx, aFrameNumber, aSourceText);
return NS_OK;
}
/* jsval variantToJS (in JSContextPtr ctx, in JSObjectPtr scope, in nsIVariant value); */
NS_IMETHODIMP
nsXPConnect::VariantToJS(JSContext* ctx, JSObject* scope, nsIVariant* value, jsval* _retval)
{
NS_PRECONDITION(ctx, "bad param");
NS_PRECONDITION(scope, "bad param");
NS_PRECONDITION(value, "bad param");
NS_PRECONDITION(_retval, "bad param");
XPCCallContext ccx(NATIVE_CALLER, ctx);
if (!ccx.IsValid())
return NS_ERROR_FAILURE;
XPCLazyCallContext lccx(ccx);
MOZ_ASSERT(js::IsObjectInContextCompartment(scope, ctx));
nsresult rv = NS_OK;
if (!XPCVariant::VariantDataToJS(lccx, value, &rv, _retval)) {
if (NS_FAILED(rv))
return rv;
return NS_ERROR_FAILURE;
}
return NS_OK;
}
/* nsIVariant JSToVariant (in JSContextPtr ctx, in jsval value); */
NS_IMETHODIMP
nsXPConnect::JSToVariant(JSContext* ctx, const jsval &value, nsIVariant** _retval)
{
NS_PRECONDITION(ctx, "bad param");
NS_PRECONDITION(value != JSVAL_NULL, "bad param");
NS_PRECONDITION(_retval, "bad param");
XPCCallContext ccx(NATIVE_CALLER, ctx);
if (!ccx.IsValid())
return NS_ERROR_FAILURE;
*_retval = XPCVariant::newVariant(ccx, value);
if (!(*_retval))
return NS_ERROR_FAILURE;
return NS_OK;
}
NS_IMETHODIMP
nsXPConnect::OnProcessNextEvent(nsIThreadInternal *aThread, bool aMayWait,
uint32_t aRecursionDepth)
{
// Record this event.
mEventDepth++;
// Push a null JSContext so that we don't see any script during
// event processing.
MOZ_ASSERT(NS_IsMainThread());
return Push(nullptr);
}
NS_IMETHODIMP
nsXPConnect::AfterProcessNextEvent(nsIThreadInternal *aThread,
uint32_t aRecursionDepth)
{
// Watch out for unpaired events during observer registration.
if (NS_UNLIKELY(mEventDepth == 0))
return NS_OK;
mEventDepth--;
// Call cycle collector occasionally.
MOZ_ASSERT(NS_IsMainThread());
nsJSContext::MaybePokeCC();
nsDOMMutationObserver::HandleMutations();
return Pop(nullptr);
}
NS_IMETHODIMP
nsXPConnect::OnDispatchedEvent(nsIThreadInternal* aThread)
{
NS_NOTREACHED("Why tell us?");
return NS_ERROR_UNEXPECTED;
}
NS_IMETHODIMP
nsXPConnect::AddJSHolder(void* aHolder, nsScriptObjectTracer* aTracer)
{
return mRuntime->AddJSHolder(aHolder, aTracer);
}
NS_IMETHODIMP
nsXPConnect::RemoveJSHolder(void* aHolder)
{
return mRuntime->RemoveJSHolder(aHolder);
}
NS_IMETHODIMP
nsXPConnect::TestJSHolder(void* aHolder, bool* aRetval)
{
#ifdef DEBUG
return mRuntime->TestJSHolder(aHolder, aRetval);
#else
MOZ_ASSERT(false);
return NS_ERROR_FAILURE;
#endif
}
NS_IMETHODIMP
nsXPConnect::SetReportAllJSExceptions(bool newval)
{
// Ignore if the environment variable was set.
if (gReportAllJSExceptions != 1)
gReportAllJSExceptions = newval ? 2 : 0;
return NS_OK;
}
/* attribute JSRuntime runtime; */
NS_IMETHODIMP
nsXPConnect::GetRuntime(JSRuntime **runtime)
{
if (!runtime)
return NS_ERROR_NULL_POINTER;
JSRuntime *rt = GetRuntime()->GetJSRuntime();
JS_AbortIfWrongThread(rt);
*runtime = rt;
return NS_OK;
}
/* attribute nsIXPCScriptable backstagePass; */
NS_IMETHODIMP
nsXPConnect::GetBackstagePass(nsIXPCScriptable **bsp)
{
if (!mBackstagePass) {
nsCOMPtr<nsIPrincipal> sysprin;
nsCOMPtr<nsIScriptSecurityManager> secman =
do_GetService(NS_SCRIPTSECURITYMANAGER_CONTRACTID);
if (!secman)
return NS_ERROR_NOT_AVAILABLE;
if (NS_FAILED(secman->GetSystemPrincipal(getter_AddRefs(sysprin))))
return NS_ERROR_NOT_AVAILABLE;
mBackstagePass = new BackstagePass(sysprin);
if (!mBackstagePass)
return NS_ERROR_OUT_OF_MEMORY;
}
NS_ADDREF(*bsp = mBackstagePass);
return NS_OK;
}
/* [noscript, notxpcom] void registerGCCallback(in JSGCCallback func); */
NS_IMETHODIMP_(void)
nsXPConnect::RegisterGCCallback(JSGCCallback func)
{
mRuntime->AddGCCallback(func);
}
/* [noscript, notxpcom] void unregisterGCCallback(in JSGCCallback func); */
NS_IMETHODIMP_(void)
nsXPConnect::UnregisterGCCallback(JSGCCallback func)
{
mRuntime->RemoveGCCallback(func);
}
// nsIJSContextStack and nsIThreadJSContextStack implementations
/* readonly attribute int32_t Count; */
NS_IMETHODIMP
nsXPConnect::GetCount(int32_t *aCount)
{
MOZ_ASSERT(aCount);
*aCount = XPCJSRuntime::Get()->GetJSContextStack()->Count();
return NS_OK;
}
/* JSContext Peek (); */
NS_IMETHODIMP
nsXPConnect::Peek(JSContext * *_retval)
{
MOZ_ASSERT(_retval);
*_retval = xpc_UnmarkGrayContext(XPCJSRuntime::Get()->GetJSContextStack()->Peek());
return NS_OK;
}
#ifdef MOZ_JSDEBUGGER
void
nsXPConnect::CheckForDebugMode(JSRuntime *rt)
{
JSContext *cx = NULL;
if (gDebugMode == gDesiredDebugMode) {
return;
}
// This can happen if a Worker is running, but we don't have the ability to
// debug workers right now, so just return.
if (!NS_IsMainThread()) {
return;
}
JS_SetRuntimeDebugMode(rt, gDesiredDebugMode);
nsresult rv;
const char jsdServiceCtrID[] = "@mozilla.org/js/jsd/debugger-service;1";
nsCOMPtr<jsdIDebuggerService> jsds = do_GetService(jsdServiceCtrID, &rv);
if (NS_FAILED(rv)) {
goto fail;
}
if (!(cx = JS_NewContext(rt, 256))) {
goto fail;
}
{
struct AutoDestroyContext {
JSContext *cx;
AutoDestroyContext(JSContext *cx) : cx(cx) {}
~AutoDestroyContext() { JS_DestroyContext(cx); }
} adc(cx);
JSAutoRequest ar(cx);
if (!JS_SetDebugModeForAllCompartments(cx, gDesiredDebugMode))
goto fail;
}
if (gDesiredDebugMode) {
rv = jsds->ActivateDebugger(rt);
}
gDebugMode = gDesiredDebugMode;
return;
fail:
if (jsds)
jsds->DeactivateDebugger();
/*
* If an attempt to turn debug mode on fails, cancel the request. It's
* always safe to turn debug mode off, since DeactivateDebugger prevents
* debugger callbacks from having any effect.
*/
if (gDesiredDebugMode)
JS_SetRuntimeDebugMode(rt, false);
gDesiredDebugMode = gDebugMode = false;
}
#else //MOZ_JSDEBUGGER not defined
void
nsXPConnect::CheckForDebugMode(JSRuntime *rt)
{
gDesiredDebugMode = gDebugMode = false;
}
#endif //#ifdef MOZ_JSDEBUGGER
NS_EXPORT_(void)
xpc_ActivateDebugMode()
{
XPCJSRuntime* rt = nsXPConnect::GetRuntimeInstance();
nsXPConnect::GetXPConnect()->SetDebugModeWhenPossible(true, true);
nsXPConnect::CheckForDebugMode(rt->GetJSRuntime());
}
/* JSContext Pop (); */
NS_IMETHODIMP
nsXPConnect::Pop(JSContext * *_retval)
{
JSContext *cx = XPCJSRuntime::Get()->GetJSContextStack()->Pop();
if (_retval)
*_retval = xpc_UnmarkGrayContext(cx);
return NS_OK;
}
/* void Push (in JSContext cx); */
NS_IMETHODIMP
nsXPConnect::Push(JSContext * cx)
{
if (gDebugMode != gDesiredDebugMode && NS_IsMainThread()) {
const InfallibleTArray<XPCJSContextInfo>* stack =
XPCJSRuntime::Get()->GetJSContextStack()->GetStack();
if (!gDesiredDebugMode) {
/* Turn off debug mode immediately, even if JS code is currently running */
CheckForDebugMode(mRuntime->GetJSRuntime());
} else {
bool runningJS = false;
for (uint32_t i = 0; i < stack->Length(); ++i) {
JSContext *cx = (*stack)[i].cx;
if (cx && js::IsContextRunningJS(cx)) {
runningJS = true;
break;
}
}
if (!runningJS)
CheckForDebugMode(mRuntime->GetJSRuntime());
}
}
return XPCJSRuntime::Get()->GetJSContextStack()->Push(cx) ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
}
/* virtual */
JSContext*
nsXPConnect::GetSafeJSContext()
{
return XPCJSRuntime::Get()->GetJSContextStack()->GetSafeJSContext();
}
nsIPrincipal*
nsXPConnect::GetPrincipal(JSObject* obj, bool allowShortCircuit) const
{
NS_ASSERTION(IS_WRAPPER_CLASS(js::GetObjectClass(obj)),
"What kind of wrapper is this?");
if (IS_WN_WRAPPER_OBJECT(obj)) {
XPCWrappedNative *xpcWrapper =
(XPCWrappedNative *)xpc_GetJSPrivate(obj);
if (xpcWrapper) {
if (allowShortCircuit) {
nsIPrincipal *result = xpcWrapper->GetObjectPrincipal();
if (result) {
return result;
}
}
// If not, check if it points to an nsIScriptObjectPrincipal
nsCOMPtr<nsIScriptObjectPrincipal> objPrin =
do_QueryInterface(xpcWrapper->Native());
if (objPrin) {
nsIPrincipal *result = objPrin->GetPrincipal();
if (result) {
return result;
}
}
}
} else {
if (allowShortCircuit) {
nsIPrincipal *result =
GetSlimWrapperProto(obj)->GetScope()->GetPrincipal();
if (result) {
return result;
}
}
nsCOMPtr<nsIScriptObjectPrincipal> objPrin =
do_QueryInterface((nsISupports*)xpc_GetJSPrivate(obj));
if (objPrin) {
nsIPrincipal *result = objPrin->GetPrincipal();
if (result) {
return result;
}
}
}
return nullptr;
}
NS_IMETHODIMP
nsXPConnect::HoldObject(JSContext *aJSContext, JSObject *aObject,
nsIXPConnectJSObjectHolder **aHolder)
{
XPCCallContext ccx(NATIVE_CALLER, aJSContext);
XPCJSObjectHolder* objHolder = XPCJSObjectHolder::newHolder(ccx, aObject);
if (!objHolder)
return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(*aHolder = objHolder);
return NS_OK;
}
NS_IMETHODIMP_(void)
nsXPConnect::GetCaller(JSContext **aJSContext, JSObject **aObj)
{
XPCCallContext *ccx = XPCJSRuntime::Get()->GetCallContext();
*aJSContext = ccx->GetJSContext();
// Set to the caller in XPC_WN_Helper_{Call,Construct}
*aObj = ccx->GetFlattenedJSObject();
}
namespace xpc {
bool
DeferredRelease(nsISupports *obj)
{
return nsXPConnect::GetRuntimeInstance()->DeferredRelease(obj);
}
NS_EXPORT_(bool)
Base64Encode(JSContext *cx, JS::Value val, JS::Value *out)
{
MOZ_ASSERT(cx);
MOZ_ASSERT(out);
JS::Value root = val;
xpc_qsACString encodedString(cx, root, &root, xpc_qsACString::eNull,
xpc_qsACString::eStringify);
if (!encodedString.IsValid())
return false;
nsAutoCString result;
if (NS_FAILED(mozilla::Base64Encode(encodedString, result))) {
JS_ReportError(cx, "Failed to encode base64 data!");
return false;
}
JSString *str = JS_NewStringCopyN(cx, result.get(), result.Length());
if (!str)
return false;
*out = STRING_TO_JSVAL(str);
return true;
}
NS_EXPORT_(bool)
Base64Decode(JSContext *cx, JS::Value val, JS::Value *out)
{
MOZ_ASSERT(cx);
MOZ_ASSERT(out);
JS::Value root = val;
xpc_qsACString encodedString(cx, root, &root, xpc_qsACString::eNull,
xpc_qsACString::eNull);
if (!encodedString.IsValid())
return false;
nsAutoCString result;
if (NS_FAILED(mozilla::Base64Decode(encodedString, result))) {
JS_ReportError(cx, "Failed to decode base64 string!");
return false;
}
JSString *str = JS_NewStringCopyN(cx, result.get(), result.Length());
if (!str)
return false;
*out = STRING_TO_JSVAL(str);
return true;
}
void
DumpJSHeap(FILE* file)
{
NS_ABORT_IF_FALSE(NS_IsMainThread(), "Must dump GC heap on main thread.");
nsXPConnect* xpc = nsXPConnect::GetXPConnect();
if (!xpc) {
NS_ERROR("Failed to get nsXPConnect instance!");
return;
}
js::DumpHeapComplete(xpc->GetRuntime()->GetJSRuntime(), file);
}
void
SetLocationForGlobal(JSObject *global, const nsACString& location)
{
MOZ_ASSERT(global);
CompartmentPrivate *priv = GetCompartmentPrivate(global);
MOZ_ASSERT(priv, "No compartment private");
priv->SetLocation(location);
}
void
SetLocationForGlobal(JSObject *global, nsIURI *locationURI)
{
MOZ_ASSERT(global);
CompartmentPrivate *priv = GetCompartmentPrivate(global);
MOZ_ASSERT(priv, "No compartment private");
priv->SetLocation(locationURI);
}
} // namespace xpc
static void
NoteJSChildGrayWrapperShim(void *data, void *thing)
{
TraversalTracer *trc = static_cast<TraversalTracer*>(data);
NoteJSChild(trc, thing, js_GetGCThingTraceKind(thing));
}
static void
TraverseObjectShim(void *data, void *thing)
{
nsCycleCollectionTraversalCallback *cb =
static_cast<nsCycleCollectionTraversalCallback*>(data);
MOZ_ASSERT(js_GetGCThingTraceKind(thing) == JSTRACE_OBJECT);
TraverseGCThing(TRAVERSE_CPP, thing, JSTRACE_OBJECT, *cb);
}
/*
* The cycle collection participant for a JSCompartment is intended to produce the same
* results as if all of the gray GCthings in a compartment were merged into a single node,
* except for self-edges. This avoids the overhead of representing all of the GCthings in
* the compartment in the cycle collector graph, which should be much faster if many of
* the GCthings in the compartment are gray.
*
* Compartment merging should not always be used, because it is a conservative
* approximation of the true cycle collector graph that can incorrectly identify some
* garbage objects as being live. For instance, consider two cycles that pass through a
* compartment, where one is garbage and the other is live. If we merge the entire
* compartment, the cycle collector will think that both are alive.
*
* We don't have to worry about losing track of a garbage cycle, because any such garbage
* cycle incorrectly identified as live must contain at least one C++ to JS edge, and
* XPConnect will always add the C++ object to the CC graph. (This is in contrast to pure
* C++ garbage cycles, which must always be properly identified, because we clear the
* purple buffer during every CC, which may contain the last reference to a garbage
* cycle.)
*/
class JSCompartmentParticipant : public nsCycleCollectionParticipant
{
public:
static NS_METHOD TraverseImpl(JSCompartmentParticipant *that, void *p,
nsCycleCollectionTraversalCallback &cb)
{
MOZ_ASSERT(!cb.WantAllTraces());
JSCompartment *c = static_cast<JSCompartment*>(p);
/*
* We treat the compartment as being gray. We handle non-gray GCthings in the
* compartment by not reporting their children to the CC. The black-gray invariant
* ensures that any JS children will also be non-gray, and thus don't need to be
* added to the graph. For C++ children, not representing the edge from the
* non-gray JS GCthings to the C++ object will keep the child alive.
*
* We don't allow compartment merging in a WantAllTraces CC, because then these
* assumptions don't hold.
*/
cb.DescribeGCedNode(false, "JS Compartment");
/*
* Every JS child of everything in the compartment is either in the compartment
* or is a cross-compartment wrapper. In the former case, we don't need to
* represent these edges in the CC graph because JS objects are not ref counted.
* In the latter case, the JS engine keeps a map of these wrappers, which we
* iterate over.
*/
TraversalTracer trc(cb);
JSRuntime *rt = nsXPConnect::GetRuntimeInstance()->GetJSRuntime();
JS_TracerInit(&trc, rt, NoteJSChildTracerShim);
trc.eagerlyTraceWeakMaps = false;
js::VisitGrayWrapperTargets(c, NoteJSChildGrayWrapperShim, &trc);
/*
* To find C++ children of things in the compartment, we scan every JS Object in
* the compartment. Only JS Objects can have C++ children.
*/
js::IterateGrayObjects(c, TraverseObjectShim, &cb);
return NS_OK;
}
static NS_METHOD RootImpl(void *p)
{
return NS_OK;
}
static NS_METHOD UnlinkImpl(void *p)
{
return NS_OK;
}
static NS_METHOD UnrootImpl(void *p)
{
return NS_OK;
}
static NS_METHOD_(void) UnmarkIfPurpleImpl(void *n)
{
}
};
static const CCParticipantVTable<JSCompartmentParticipant>::Type
JSCompartment_cycleCollectorGlobal = {
NS_IMPL_CYCLE_COLLECTION_NATIVE_VTABLE(JSCompartmentParticipant)
};
nsCycleCollectionParticipant *
xpc_JSCompartmentParticipant()
{
return JSCompartment_cycleCollectorGlobal.GetParticipant();
}
NS_IMETHODIMP
nsXPConnect::SetDebugModeWhenPossible(bool mode, bool allowSyncDisable)
{
gDesiredDebugMode = mode;
if (!mode && allowSyncDisable)
CheckForDebugMode(mRuntime->GetJSRuntime());
return NS_OK;
}
NS_IMETHODIMP
nsXPConnect::GetTelemetryValue(JSContext *cx, jsval *rval)
{
JSObject *obj = JS_NewObject(cx, NULL, NULL, NULL);
if (!obj)
return NS_ERROR_OUT_OF_MEMORY;
unsigned attrs = JSPROP_ENUMERATE | JSPROP_READONLY | JSPROP_PERMANENT;
size_t i = JS_GetE4XObjectsCreated(cx);
jsval v = DOUBLE_TO_JSVAL(i);
if (!JS_DefineProperty(cx, obj, "e4x", v, NULL, NULL, attrs))
return NS_ERROR_OUT_OF_MEMORY;
i = JS_SetProtoCalled(cx);
v = DOUBLE_TO_JSVAL(i);
if (!JS_DefineProperty(cx, obj, "setProto", v, NULL, NULL, attrs))
return NS_ERROR_OUT_OF_MEMORY;
i = JS_GetCustomIteratorCount(cx);
v = DOUBLE_TO_JSVAL(i);
if (!JS_DefineProperty(cx, obj, "customIter", v, NULL, NULL, attrs))
return NS_ERROR_OUT_OF_MEMORY;
*rval = OBJECT_TO_JSVAL(obj);
return NS_OK;
}
NS_IMETHODIMP
nsXPConnect::NotifyDidPaint()
{
js::NotifyDidPaint(GetRuntime()->GetJSRuntime());
return NS_OK;
}
const uint8_t HAS_PRINCIPALS_FLAG = 1;
const uint8_t HAS_ORIGIN_PRINCIPALS_FLAG = 2;
static nsresult
WriteScriptOrFunction(nsIObjectOutputStream *stream, JSContext *cx,
JSScript *script, JSObject *functionObj)
{
// Exactly one of script or functionObj must be given
MOZ_ASSERT(!script != !functionObj);
if (!script)
script = JS_GetFunctionScript(cx, JS_GetObjectFunction(functionObj));
nsIPrincipal *principal =
nsJSPrincipals::get(JS_GetScriptPrincipals(script));
nsIPrincipal *originPrincipal =
nsJSPrincipals::get(JS_GetScriptOriginPrincipals(script));
uint8_t flags = 0;
if (principal)
flags |= HAS_PRINCIPALS_FLAG;
// Optimize for the common case when originPrincipals == principals. As
// originPrincipals is set to principals when the former is null we can
// simply skip the originPrincipals when they are the same as principals.
if (originPrincipal && originPrincipal != principal)
flags |= HAS_ORIGIN_PRINCIPALS_FLAG;
nsresult rv = stream->Write8(flags);
if (NS_FAILED(rv))
return rv;
if (flags & HAS_PRINCIPALS_FLAG) {
rv = stream->WriteObject(principal, true);
if (NS_FAILED(rv))
return rv;
}
if (flags & HAS_ORIGIN_PRINCIPALS_FLAG) {
rv = stream->WriteObject(originPrincipal, true);
if (NS_FAILED(rv))
return rv;
}
uint32_t size;
void* data;
{
JSAutoRequest ar(cx);
if (functionObj)
data = JS_EncodeInterpretedFunction(cx, functionObj, &size);
else
data = JS_EncodeScript(cx, script, &size);
}
if (!data)
return NS_ERROR_OUT_OF_MEMORY;
MOZ_ASSERT(size);
rv = stream->Write32(size);
if (NS_SUCCEEDED(rv))
rv = stream->WriteBytes(static_cast<char *>(data), size);
js_free(data);
return rv;
}
static nsresult
ReadScriptOrFunction(nsIObjectInputStream *stream, JSContext *cx,
JSScript **scriptp, JSObject **functionObjp)
{
// Exactly one of script or functionObj must be given
MOZ_ASSERT(!scriptp != !functionObjp);
uint8_t flags;
nsresult rv = stream->Read8(&flags);
if (NS_FAILED(rv))
return rv;
nsJSPrincipals* principal = nullptr;
nsCOMPtr<nsIPrincipal> readPrincipal;
if (flags & HAS_PRINCIPALS_FLAG) {
rv = stream->ReadObject(true, getter_AddRefs(readPrincipal));
if (NS_FAILED(rv))
return rv;
principal = nsJSPrincipals::get(readPrincipal);
}
nsJSPrincipals* originPrincipal = nullptr;
nsCOMPtr<nsIPrincipal> readOriginPrincipal;
if (flags & HAS_ORIGIN_PRINCIPALS_FLAG) {
rv = stream->ReadObject(true, getter_AddRefs(readOriginPrincipal));
if (NS_FAILED(rv))
return rv;
originPrincipal = nsJSPrincipals::get(readOriginPrincipal);
}
uint32_t size;
rv = stream->Read32(&size);
if (NS_FAILED(rv))
return rv;
char* data;
rv = stream->ReadBytes(size, &data);
if (NS_FAILED(rv))
return rv;
{
JSAutoRequest ar(cx);
if (scriptp) {
JSScript *script = JS_DecodeScript(cx, data, size, principal, originPrincipal);
if (!script)
rv = NS_ERROR_OUT_OF_MEMORY;
else
*scriptp = script;
} else {
JSObject *funobj = JS_DecodeInterpretedFunction(cx, data, size,
principal, originPrincipal);
if (!funobj)
rv = NS_ERROR_OUT_OF_MEMORY;
else
*functionObjp = funobj;
}
}
nsMemory::Free(data);
return rv;
}
NS_IMETHODIMP
nsXPConnect::WriteScript(nsIObjectOutputStream *stream, JSContext *cx, JSScript *script)
{
return WriteScriptOrFunction(stream, cx, script, nullptr);
}
NS_IMETHODIMP
nsXPConnect::ReadScript(nsIObjectInputStream *stream, JSContext *cx, JSScript **scriptp)
{
return ReadScriptOrFunction(stream, cx, scriptp, nullptr);
}
NS_IMETHODIMP
nsXPConnect::WriteFunction(nsIObjectOutputStream *stream, JSContext *cx, JSObject *functionObj)
{
return WriteScriptOrFunction(stream, cx, nullptr, functionObj);
}
NS_IMETHODIMP
nsXPConnect::ReadFunction(nsIObjectInputStream *stream, JSContext *cx, JSObject **functionObjp)
{
return ReadScriptOrFunction(stream, cx, nullptr, functionObjp);
}
#ifdef DEBUG
void
nsXPConnect::SetObjectToUnlink(void* aObject)
{
if (mRuntime)
mRuntime->SetObjectToUnlink(aObject);
}
void
nsXPConnect::AssertNoObjectsToTrace(void* aPossibleJSHolder)
{
if (mRuntime)
mRuntime->AssertNoObjectsToTrace(aPossibleJSHolder);
}
#endif
/* These are here to be callable from a debugger */
JS_BEGIN_EXTERN_C
JS_EXPORT_API(void) DumpJSStack()
{
nsresult rv;
nsCOMPtr<nsIXPConnect> xpc(do_GetService(nsIXPConnect::GetCID(), &rv));
if (NS_SUCCEEDED(rv) && xpc)
xpc->DebugDumpJSStack(true, true, false);
else
printf("failed to get XPConnect service!\n");
}
JS_EXPORT_API(char*) PrintJSStack()
{
nsresult rv;
nsCOMPtr<nsIXPConnect> xpc(do_GetService(nsIXPConnect::GetCID(), &rv));
return (NS_SUCCEEDED(rv) && xpc) ?
xpc->DebugPrintJSStack(true, true, false) :
nullptr;
}
JS_EXPORT_API(void) DumpJSEval(uint32_t frameno, const char* text)
{
nsresult rv;
nsCOMPtr<nsIXPConnect> xpc(do_GetService(nsIXPConnect::GetCID(), &rv));
if (NS_SUCCEEDED(rv) && xpc)
xpc->DebugDumpEvalInJSStackFrame(frameno, text);
else
printf("failed to get XPConnect service!\n");
}
JS_EXPORT_API(void) DumpCompleteHeap()
{
nsCOMPtr<nsICycleCollectorListener> listener =
do_CreateInstance("@mozilla.org/cycle-collector-logger;1");
if (!listener) {
NS_WARNING("Failed to create CC logger");
return;
}
nsCOMPtr<nsICycleCollectorListener> alltracesListener;
listener->AllTraces(getter_AddRefs(alltracesListener));
if (!alltracesListener) {
NS_WARNING("Failed to get all traces logger");
return;
}
nsJSContext::CycleCollectNow(alltracesListener);
}
JS_END_EXTERN_C
