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fune/js/src/jsfriendapi.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=8 sts=4 et sw=4 tw=99:
* 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 "jsfriendapi.h"
#include "mozilla/Atomics.h"
#include "mozilla/PodOperations.h"
#include "mozilla/TimeStamp.h"
#include <stdint.h>
#ifdef ENABLE_BIGINT
#include "builtin/BigInt.h"
#endif
#include "builtin/Promise.h"
#include "builtin/TestingFunctions.h"
#include "gc/GCInternals.h"
#include "gc/PublicIterators.h"
#include "gc/WeakMap.h"
#include "js/AutoByteString.h"
#include "js/Printf.h"
#include "js/Proxy.h"
#include "js/Wrapper.h"
#include "proxy/DeadObjectProxy.h"
#include "vm/ArgumentsObject.h"
#include "vm/JSContext.h"
#include "vm/JSObject.h"
#include "vm/Realm.h"
#include "vm/Time.h"
#include "vm/WrapperObject.h"
#include "gc/Nursery-inl.h"
#include "vm/EnvironmentObject-inl.h"
#include "vm/JSObject-inl.h"
#include "vm/JSScript-inl.h"
#include "vm/NativeObject-inl.h"
using namespace js;
using mozilla::PodArrayZero;
JS::RootingContext::RootingContext()
: autoGCRooters_(nullptr), realm_(nullptr), zone_(nullptr)
{
for (auto& stackRootPtr : stackRoots_)
stackRootPtr = nullptr;
PodArrayZero(nativeStackLimit);
#if JS_STACK_GROWTH_DIRECTION > 0
for (int i=0; i<StackKindCount; i++)
nativeStackLimit[i] = UINTPTR_MAX;
#endif
}
JS_FRIEND_API(void)
js::SetSourceHook(JSContext* cx, mozilla::UniquePtr<SourceHook> hook)
{
cx->runtime()->sourceHook.ref() = std::move(hook);
}
JS_FRIEND_API(mozilla::UniquePtr<SourceHook>)
js::ForgetSourceHook(JSContext* cx)
{
return std::move(cx->runtime()->sourceHook.ref());
}
JS_FRIEND_API(void)
JS_SetGrayGCRootsTracer(JSContext* cx, JSTraceDataOp traceOp, void* data)
{
cx->runtime()->gc.setGrayRootsTracer(traceOp, data);
}
JS_FRIEND_API(JSObject*)
JS_FindCompilationScope(JSContext* cx, HandleObject objArg)
{
cx->check(objArg);
RootedObject obj(cx, objArg);
/*
* We unwrap wrappers here. This is a little weird, but it's what's being
* asked of us.
*/
if (obj->is<WrapperObject>())
obj = UncheckedUnwrap(obj);
/*
* Get the Window if `obj` is a WindowProxy so that we compile in the
* correct (global) scope.
*/
return ToWindowIfWindowProxy(obj);
}
JS_FRIEND_API(JSFunction*)
JS_GetObjectFunction(JSObject* obj)
{
if (obj->is<JSFunction>())
return &obj->as<JSFunction>();
return nullptr;
}
JS_FRIEND_API(bool)
JS_SplicePrototype(JSContext* cx, HandleObject obj, HandleObject proto)
{
/*
* Change the prototype of an object which hasn't been used anywhere
* and does not share its type with another object. Unlike JS_SetPrototype,
* does not nuke type information for the object.
*/
CHECK_REQUEST(cx);
cx->check(obj, proto);
if (!obj->isSingleton()) {
/*
* We can see non-singleton objects when trying to splice prototypes
* due to mutable __proto__ (ugh).
*/
return JS_SetPrototype(cx, obj, proto);
}
Rooted<TaggedProto> tagged(cx, TaggedProto(proto));
return JSObject::splicePrototype(cx, obj, obj->getClass(), tagged);
}
JS_FRIEND_API(JSObject*)
JS_NewObjectWithUniqueType(JSContext* cx, const JSClass* clasp, HandleObject proto)
{
/*
* Create our object with a null proto and then splice in the correct proto
* after we setSingleton, so that we don't pollute the default
* ObjectGroup attached to our proto with information about our object, since
* we're not going to be using that ObjectGroup anyway.
*/
RootedObject obj(cx, NewObjectWithGivenProto(cx, Valueify(clasp), nullptr, SingletonObject));
if (!obj)
return nullptr;
if (!JS_SplicePrototype(cx, obj, proto))
return nullptr;
return obj;
}
JS_FRIEND_API(JSObject*)
JS_NewObjectWithoutMetadata(JSContext* cx, const JSClass* clasp, JS::Handle<JSObject*> proto)
{
cx->check(proto);
AutoSuppressAllocationMetadataBuilder suppressMetadata(cx);
return JS_NewObjectWithGivenProto(cx, clasp, proto);
}
JS_FRIEND_API(bool)
JS::GetIsSecureContext(JS::Realm* realm)
{
return realm->creationOptions().secureContext();
}
JS_FRIEND_API(JSPrincipals*)
JS_GetCompartmentPrincipals(JS::Compartment* compartment)
{
// Note: for now we assume a single realm per compartment. This API will go
// away after we remove the remaining callers. See bug 1465700.
MOZ_RELEASE_ASSERT(compartment->realms().length() == 1);
return compartment->realms()[0]->principals();
}
JS_FRIEND_API(JSPrincipals*)
JS::GetRealmPrincipals(JS::Realm* realm)
{
return realm->principals();
}
JS_FRIEND_API(void)
JS::SetRealmPrincipals(JS::Realm* realm, JSPrincipals* principals)
{
// Short circuit if there's no change.
if (principals == realm->principals())
return;
// We'd like to assert that our new principals is always same-origin
// with the old one, but JSPrincipals doesn't give us a way to do that.
// But we can at least assert that we're not switching between system
// and non-system.
const JSPrincipals* trusted = realm->runtimeFromMainThread()->trustedPrincipals();
bool isSystem = principals && principals == trusted;
MOZ_RELEASE_ASSERT(realm->isSystem() == isSystem);
// Clear out the old principals, if any.
if (realm->principals()) {
JS_DropPrincipals(TlsContext.get(), realm->principals());
realm->setPrincipals(nullptr);
}
// Set up the new principals.
if (principals) {
JS_HoldPrincipals(principals);
realm->setPrincipals(principals);
}
}
JS_FRIEND_API(JSPrincipals*)
JS_GetScriptPrincipals(JSScript* script)
{
return script->principals();
}
JS_FRIEND_API(JS::Realm*)
js::GetScriptRealm(JSScript* script)
{
return script->realm();
}
JS_FRIEND_API(bool)
JS_ScriptHasMutedErrors(JSScript* script)
{
return script->mutedErrors();
}
JS_FRIEND_API(bool)
JS_WrapPropertyDescriptor(JSContext* cx, JS::MutableHandle<JS::PropertyDescriptor> desc)
{
return cx->compartment()->wrap(cx, desc);
}
JS_FRIEND_API(void)
JS_TraceShapeCycleCollectorChildren(JS::CallbackTracer* trc, JS::GCCellPtr shape)
{
MOZ_ASSERT(shape.is<Shape>());
TraceCycleCollectorChildren(trc, &shape.as<Shape>());
}
JS_FRIEND_API(void)
JS_TraceObjectGroupCycleCollectorChildren(JS::CallbackTracer* trc, JS::GCCellPtr group)
{
MOZ_ASSERT(group.is<ObjectGroup>());
TraceCycleCollectorChildren(trc, &group.as<ObjectGroup>());
}
static bool
DefineHelpProperty(JSContext* cx, HandleObject obj, const char* prop, const char* value)
{
RootedAtom atom(cx, Atomize(cx, value, strlen(value)));
if (!atom)
return false;
return JS_DefineProperty(cx, obj, prop, atom, JSPROP_READONLY | JSPROP_PERMANENT);
}
JS_FRIEND_API(bool)
JS_DefineFunctionsWithHelp(JSContext* cx, HandleObject obj, const JSFunctionSpecWithHelp* fs)
{
MOZ_ASSERT(!cx->zone()->isAtomsZone());
CHECK_REQUEST(cx);
cx->check(obj);
for (; fs->name; fs++) {
JSAtom* atom = Atomize(cx, fs->name, strlen(fs->name));
if (!atom)
return false;
Rooted<jsid> id(cx, AtomToId(atom));
RootedFunction fun(cx, DefineFunction(cx, obj, id, fs->call, fs->nargs,
fs->flags | JSPROP_RESOLVING));
if (!fun)
return false;
if (fs->jitInfo)
fun->setJitInfo(fs->jitInfo);
if (fs->usage) {
if (!DefineHelpProperty(cx, fun, "usage", fs->usage))
return false;
}
if (fs->help) {
if (!DefineHelpProperty(cx, fun, "help", fs->help))
return false;
}
}
return true;
}
JS_FRIEND_API(bool)
js::GetBuiltinClass(JSContext* cx, HandleObject obj, ESClass* cls)
{
if (MOZ_UNLIKELY(obj->is<ProxyObject>()))
return Proxy::getBuiltinClass(cx, obj, cls);
if (obj->is<PlainObject>() || obj->is<UnboxedPlainObject>())
*cls = ESClass::Object;
else if (obj->is<ArrayObject>())
*cls = ESClass::Array;
else if (obj->is<NumberObject>())
*cls = ESClass::Number;
else if (obj->is<StringObject>())
*cls = ESClass::String;
else if (obj->is<BooleanObject>())
*cls = ESClass::Boolean;
else if (obj->is<RegExpObject>())
*cls = ESClass::RegExp;
else if (obj->is<ArrayBufferObject>())
*cls = ESClass::ArrayBuffer;
else if (obj->is<SharedArrayBufferObject>())
*cls = ESClass::SharedArrayBuffer;
else if (obj->is<DateObject>())
*cls = ESClass::Date;
else if (obj->is<SetObject>())
*cls = ESClass::Set;
else if (obj->is<MapObject>())
*cls = ESClass::Map;
else if (obj->is<PromiseObject>())
*cls = ESClass::Promise;
else if (obj->is<MapIteratorObject>())
*cls = ESClass::MapIterator;
else if (obj->is<SetIteratorObject>())
*cls = ESClass::SetIterator;
else if (obj->is<ArgumentsObject>())
*cls = ESClass::Arguments;
else if (obj->is<ErrorObject>())
*cls = ESClass::Error;
#ifdef ENABLE_BIGINT
else if (obj->is<BigIntObject>())
*cls = ESClass::BigInt;
#endif
else
*cls = ESClass::Other;
return true;
}
JS_FRIEND_API(const char*)
js::ObjectClassName(JSContext* cx, HandleObject obj)
{
cx->check(obj);
return GetObjectClassName(cx, obj);
}
JS_FRIEND_API(JS::Zone*)
js::GetRealmZone(JS::Realm* realm)
{
return realm->zone();
}
JS_FRIEND_API(bool)
js::IsSystemCompartment(JS::Compartment* comp)
{
// Realms in the same compartment must either all be system realms or
// non-system realms. We assert this in NewRealm and SetRealmPrincipals,
// but do an extra sanity check here.
MOZ_ASSERT(comp->realms()[0]->isSystem() == comp->realms().back()->isSystem());
return comp->realms()[0]->isSystem();
}
JS_FRIEND_API(bool)
js::IsSystemRealm(JS::Realm* realm)
{
return realm->isSystem();
}
JS_FRIEND_API(bool)
js::IsSystemZone(Zone* zone)
{
return zone->isSystem;
}
JS_FRIEND_API(bool)
js::IsAtomsZone(JS::Zone* zone)
{
return zone->runtimeFromAnyThread()->isAtomsZone(zone);
}
JS_FRIEND_API(bool)
js::IsFunctionObject(JSObject* obj)
{
return obj->is<JSFunction>();
}
JS_FRIEND_API(bool)
js::UninlinedIsCrossCompartmentWrapper(const JSObject* obj)
{
return js::IsCrossCompartmentWrapper(obj);
}
JS_FRIEND_API(JSObject*)
js::GetPrototypeNoProxy(JSObject* obj)
{
MOZ_ASSERT(!obj->is<js::ProxyObject>());
return obj->staticPrototype();
}
JS_FRIEND_API(void)
js::AssertSameCompartment(JSContext* cx, JSObject* obj)
{
cx->check(obj);
}
JS_FRIEND_API(void)
js::AssertSameCompartment(JSContext* cx, JS::HandleValue v)
{
cx->check(v);
}
#ifdef DEBUG
JS_FRIEND_API(void)
js::AssertSameCompartment(JSObject* objA, JSObject* objB)
{
MOZ_ASSERT(objA->compartment() == objB->compartment());
}
#endif
JS_FRIEND_API(void)
js::NotifyAnimationActivity(JSObject* obj)
{
MOZ_ASSERT(obj->is<GlobalObject>());
auto timeNow = mozilla::TimeStamp::Now();
obj->as<GlobalObject>().realm()->lastAnimationTime = timeNow;
obj->runtimeFromMainThread()->lastAnimationTime = timeNow;
}
JS_FRIEND_API(uint32_t)
js::GetObjectSlotSpan(JSObject* obj)
{
return obj->as<NativeObject>().slotSpan();
}
JS_FRIEND_API(bool)
js::IsObjectInContextCompartment(JSObject* obj, const JSContext* cx)
{
return obj->compartment() == cx->compartment();
}
JS_FRIEND_API(bool)
js::RunningWithTrustedPrincipals(JSContext* cx)
{
return cx->runningWithTrustedPrincipals();
}
JS_FRIEND_API(JSFunction*)
js::DefineFunctionWithReserved(JSContext* cx, JSObject* objArg, const char* name, JSNative call,
unsigned nargs, unsigned attrs)
{
RootedObject obj(cx, objArg);
MOZ_ASSERT(!cx->zone()->isAtomsZone());
CHECK_REQUEST(cx);
cx->check(obj);
JSAtom* atom = Atomize(cx, name, strlen(name));
if (!atom)
return nullptr;
Rooted<jsid> id(cx, AtomToId(atom));
return DefineFunction(cx, obj, id, call, nargs, attrs, gc::AllocKind::FUNCTION_EXTENDED);
}
JS_FRIEND_API(JSFunction*)
js::NewFunctionWithReserved(JSContext* cx, JSNative native, unsigned nargs, unsigned flags,
const char* name)
{
MOZ_ASSERT(!cx->zone()->isAtomsZone());
CHECK_REQUEST(cx);
RootedAtom atom(cx);
if (name) {
atom = Atomize(cx, name, strlen(name));
if (!atom)
return nullptr;
}
return (flags & JSFUN_CONSTRUCTOR) ?
NewNativeConstructor(cx, native, nargs, atom, gc::AllocKind::FUNCTION_EXTENDED) :
NewNativeFunction(cx, native, nargs, atom, gc::AllocKind::FUNCTION_EXTENDED);
}
JS_FRIEND_API(JSFunction*)
js::NewFunctionByIdWithReserved(JSContext* cx, JSNative native, unsigned nargs, unsigned flags,
jsid id)
{
MOZ_ASSERT(JSID_IS_STRING(id));
MOZ_ASSERT(!cx->zone()->isAtomsZone());
CHECK_REQUEST(cx);
cx->check(id);
RootedAtom atom(cx, JSID_TO_ATOM(id));
return (flags & JSFUN_CONSTRUCTOR) ?
NewNativeConstructor(cx, native, nargs, atom, gc::AllocKind::FUNCTION_EXTENDED) :
NewNativeFunction(cx, native, nargs, atom, gc::AllocKind::FUNCTION_EXTENDED);
}
JS_FRIEND_API(const Value&)
js::GetFunctionNativeReserved(JSObject* fun, size_t which)
{
MOZ_ASSERT(fun->as<JSFunction>().isNative());
return fun->as<JSFunction>().getExtendedSlot(which);
}
JS_FRIEND_API(void)
js::SetFunctionNativeReserved(JSObject* fun, size_t which, const Value& val)
{
MOZ_ASSERT(fun->as<JSFunction>().isNative());
MOZ_ASSERT_IF(val.isObject(), val.toObject().compartment() == fun->compartment());
fun->as<JSFunction>().setExtendedSlot(which, val);
}
JS_FRIEND_API(bool)
js::FunctionHasNativeReserved(JSObject* fun)
{
MOZ_ASSERT(fun->as<JSFunction>().isNative());
return fun->as<JSFunction>().isExtended();
}
JS_FRIEND_API(bool)
js::GetObjectProto(JSContext* cx, JS::Handle<JSObject*> obj, JS::MutableHandle<JSObject*> proto)
{
cx->check(obj);
if (IsProxy(obj))
return JS_GetPrototype(cx, obj, proto);
proto.set(reinterpret_cast<const shadow::Object*>(obj.get())->group->proto);
return true;
}
JS_FRIEND_API(JSObject*)
js::GetStaticPrototype(JSObject* obj)
{
MOZ_ASSERT(obj->hasStaticPrototype());
return obj->staticPrototype();
}
JS_FRIEND_API(bool)
js::GetRealmOriginalEval(JSContext* cx, MutableHandleObject eval)
{
return GlobalObject::getOrCreateEval(cx, cx->global(), eval);
}
JS_FRIEND_API(void)
js::SetReservedSlotWithBarrier(JSObject* obj, size_t slot, const js::Value& value)
{
if (IsProxy(obj))
obj->as<ProxyObject>().setReservedSlot(slot, value);
else
obj->as<NativeObject>().setSlot(slot, value);
}
void
js::SetPreserveWrapperCallback(JSContext* cx, PreserveWrapperCallback callback)
{
cx->runtime()->preserveWrapperCallback = callback;
}
JS_FRIEND_API(unsigned)
JS_PCToLineNumber(JSScript* script, jsbytecode* pc, unsigned* columnp)
{
return PCToLineNumber(script, pc, columnp);
}
JS_FRIEND_API(bool)
JS_IsDeadWrapper(JSObject* obj)
{
return IsDeadProxyObject(obj);
}
JS_FRIEND_API(JSObject*)
JS_NewDeadWrapper(JSContext* cx, JSObject* origObj)
{
return NewDeadProxyObject(cx, origObj);
}
JS_FRIEND_API(bool)
JS_IsScriptSourceObject(JSObject* obj)
{
return obj->is<ScriptSourceObject>();
}
void
js::TraceWeakMaps(WeakMapTracer* trc)
{
WeakMapBase::traceAllMappings(trc);
}
extern JS_FRIEND_API(bool)
js::AreGCGrayBitsValid(JSRuntime* rt)
{
return rt->gc.areGrayBitsValid();
}
JS_FRIEND_API(bool)
js::ZoneGlobalsAreAllGray(JS::Zone* zone)
{
for (RealmsInZoneIter realm(zone); !realm.done(); realm.next()) {
JSObject* obj = realm->unsafeUnbarrieredMaybeGlobal();
if (!obj || !JS::ObjectIsMarkedGray(obj))
return false;
}
return true;
}
JS_FRIEND_API(bool)
js::IsObjectZoneSweepingOrCompacting(JSObject* obj)
{
MOZ_ASSERT(obj);
return MaybeForwarded(obj)->zone()->isGCSweepingOrCompacting();
}
namespace {
struct VisitGrayCallbackFunctor {
GCThingCallback callback_;
void* closure_;
VisitGrayCallbackFunctor(GCThingCallback callback, void* closure)
: callback_(callback), closure_(closure)
{}
template <class T>
void operator()(T tp) const {
if ((*tp)->isMarkedGray())
callback_(closure_, JS::GCCellPtr(*tp));
}
};
} // namespace (anonymous)
JS_FRIEND_API(void)
js::VisitGrayWrapperTargets(Zone* zone, GCThingCallback callback, void* closure)
{
for (CompartmentsInZoneIter comp(zone); !comp.done(); comp.next()) {
for (Compartment::WrapperEnum e(comp); !e.empty(); e.popFront())
e.front().mutableKey().applyToWrapped(VisitGrayCallbackFunctor(callback, closure));
}
}
JS_FRIEND_API(JSObject*)
js::GetWeakmapKeyDelegate(JSObject* key)
{
if (JSWeakmapKeyDelegateOp op = key->getClass()->extWeakmapKeyDelegateOp())
return op(key);
return nullptr;
}
JS_FRIEND_API(JSLinearString*)
js::StringToLinearStringSlow(JSContext* cx, JSString* str)
{
return str->ensureLinear(cx);
}
JS_FRIEND_API(void)
JS_SetAccumulateTelemetryCallback(JSContext* cx, JSAccumulateTelemetryDataCallback callback)
{
cx->runtime()->setTelemetryCallback(cx->runtime(), callback);
}
JS_FRIEND_API(void)
JS_SetSetUseCounterCallback(JSContext* cx, JSSetUseCounterCallback callback)
{
cx->runtime()->setUseCounterCallback(cx->runtime(), callback);
}
JS_FRIEND_API(JSObject*)
JS_CloneObject(JSContext* cx, HandleObject obj, HandleObject protoArg)
{
// |obj| might be in a different compartment.
cx->check(protoArg);
Rooted<TaggedProto> proto(cx, TaggedProto(protoArg.get()));
return CloneObject(cx, obj, proto);
}
#if defined(DEBUG) || defined(JS_JITSPEW)
// We don't want jsfriendapi.h to depend on GenericPrinter,
// so these functions are declared directly in the cpp.
namespace js {
extern JS_FRIEND_API(void)
DumpString(JSString* str, js::GenericPrinter& out);
extern JS_FRIEND_API(void)
DumpAtom(JSAtom* atom, js::GenericPrinter& out);
extern JS_FRIEND_API(void)
DumpObject(JSObject* obj, js::GenericPrinter& out);
extern JS_FRIEND_API(void)
DumpChars(const char16_t* s, size_t n, js::GenericPrinter& out);
extern JS_FRIEND_API(void)
DumpValue(const JS::Value& val, js::GenericPrinter& out);
extern JS_FRIEND_API(void)
DumpId(jsid id, js::GenericPrinter& out);
extern JS_FRIEND_API(void)
DumpInterpreterFrame(JSContext* cx, js::GenericPrinter& out, InterpreterFrame* start = nullptr);
} // namespace js
JS_FRIEND_API(void)
js::DumpString(JSString* str, js::GenericPrinter& out)
{
str->dump(out);
}
JS_FRIEND_API(void)
js::DumpAtom(JSAtom* atom, js::GenericPrinter& out)
{
atom->dump(out);
}
JS_FRIEND_API(void)
js::DumpChars(const char16_t* s, size_t n, js::GenericPrinter& out)
{
out.printf("char16_t * (%p) = ", (void*) s);
JSString::dumpChars(s, n, out);
out.putChar('\n');
}
JS_FRIEND_API(void)
js::DumpObject(JSObject* obj, js::GenericPrinter& out)
{
if (!obj) {
out.printf("NULL\n");
return;
}
obj->dump(out);
}
JS_FRIEND_API(void)
js::DumpString(JSString* str, FILE* fp)
{
Fprinter out(fp);
js::DumpString(str, out);
}
JS_FRIEND_API(void)
js::DumpAtom(JSAtom* atom, FILE* fp)
{
Fprinter out(fp);
js::DumpAtom(atom, out);
}
JS_FRIEND_API(void)
js::DumpChars(const char16_t* s, size_t n, FILE* fp)
{
Fprinter out(fp);
js::DumpChars(s, n, out);
}
JS_FRIEND_API(void)
js::DumpObject(JSObject* obj, FILE* fp)
{
Fprinter out(fp);
js::DumpObject(obj, out);
}
JS_FRIEND_API(void)
js::DumpId(jsid id, FILE* fp)
{
Fprinter out(fp);
js::DumpId(id, out);
}
JS_FRIEND_API(void)
js::DumpValue(const JS::Value& val, FILE* fp) {
Fprinter out(fp);
js::DumpValue(val, out);
}
JS_FRIEND_API(void)
js::DumpString(JSString* str) {
DumpString(str, stderr);
}
JS_FRIEND_API(void)
js::DumpAtom(JSAtom* atom) {
DumpAtom(atom, stderr);
}
JS_FRIEND_API(void)
js::DumpObject(JSObject* obj) {
DumpObject(obj, stderr);
}
JS_FRIEND_API(void)
js::DumpChars(const char16_t* s, size_t n) {
DumpChars(s, n, stderr);
}
JS_FRIEND_API(void)
js::DumpValue(const JS::Value& val) {
DumpValue(val, stderr);
}
JS_FRIEND_API(void)
js::DumpId(jsid id) {
DumpId(id, stderr);
}
JS_FRIEND_API(void)
js::DumpInterpreterFrame(JSContext* cx, InterpreterFrame* start)
{
Fprinter out(stderr);
DumpInterpreterFrame(cx, out, start);
}
JS_FRIEND_API(bool)
js::DumpPC(JSContext* cx) {
return DumpPC(cx, stdout);
}
JS_FRIEND_API(bool)
js::DumpScript(JSContext* cx, JSScript* scriptArg)
{
return DumpScript(cx, scriptArg, stdout);
}
#endif
static const char*
FormatValue(JSContext* cx, const Value& vArg, JSAutoByteString& bytes)
{
RootedValue v(cx, vArg);
if (v.isMagic(JS_OPTIMIZED_OUT))
return "[unavailable]";
/*
* We could use Maybe<AutoRealm> here, but G++ can't quite follow
* that, and warns about uninitialized members being used in the
* destructor.
*/
RootedString str(cx);
if (v.isObject()) {
if (IsCrossCompartmentWrapper(&v.toObject()))
return "[cross-compartment wrapper]";
AutoRealm ar(cx, &v.toObject());
str = ToString<CanGC>(cx, v);
} else {
str = ToString<CanGC>(cx, v);
}
if (!str)
return nullptr;
const char* buf = bytes.encodeLatin1(cx, str);
if (!buf)
return nullptr;
const char* found = strstr(buf, "function ");
if (found && (found - buf <= 2))
return "[function]";
return buf;
}
// Wrapper for JS_sprintf_append() that reports allocation failure to the
// context.
static JS::UniqueChars
MOZ_FORMAT_PRINTF(3, 4)
sprintf_append(JSContext* cx, JS::UniqueChars&& buf, const char* fmt, ...)
{
va_list ap;
va_start(ap, fmt);
JS::UniqueChars result = JS_vsprintf_append(std::move(buf), fmt, ap);
va_end(ap);
if (!result) {
ReportOutOfMemory(cx);
return nullptr;
}
return result;
}
static JS::UniqueChars
FormatFrame(JSContext* cx, const FrameIter& iter, JS::UniqueChars&& inBuf, int num,
bool showArgs, bool showLocals, bool showThisProps)
{
MOZ_ASSERT(!cx->isExceptionPending());
RootedScript script(cx, iter.script());
jsbytecode* pc = iter.pc();
RootedObject envChain(cx, iter.environmentChain(cx));
JSAutoRealm ar(cx, envChain);
const char* filename = script->filename();
unsigned lineno = PCToLineNumber(script, pc);
RootedFunction fun(cx, iter.maybeCallee(cx));
RootedString funname(cx);
if (fun)
funname = fun->displayAtom();
RootedValue thisVal(cx);
if (iter.hasUsableAbstractFramePtr() &&
iter.isFunctionFrame() &&
fun && !fun->isArrow() && !fun->isDerivedClassConstructor() &&
!(fun->isBoundFunction() && iter.isConstructing()))
{
if (!GetFunctionThis(cx, iter.abstractFramePtr(), &thisVal))
return nullptr;
}
// print the frame number and function name
JS::UniqueChars buf(std::move(inBuf));
if (funname) {
JSAutoByteString funbytes;
char* str = funbytes.encodeLatin1(cx, funname);
if (!str)
return nullptr;
buf = sprintf_append(cx, std::move(buf), "%d %s(", num, str);
} else if (fun) {
buf = sprintf_append(cx, std::move(buf), "%d anonymous(", num);
} else {
buf = sprintf_append(cx, std::move(buf), "%d <TOP LEVEL>", num);
}
if (!buf)
return nullptr;
if (showArgs && iter.hasArgs()) {
PositionalFormalParameterIter fi(script);
bool first = true;
for (unsigned i = 0; i < iter.numActualArgs(); i++) {
RootedValue arg(cx);
if (i < iter.numFormalArgs() && fi.closedOver()) {
arg = iter.callObj(cx).aliasedBinding(fi);
} else if (iter.hasUsableAbstractFramePtr()) {
if (script->analyzedArgsUsage() &&
script->argsObjAliasesFormals() &&
iter.hasArgsObj())
{
arg = iter.argsObj().arg(i);
} else {
arg = iter.unaliasedActual(i, DONT_CHECK_ALIASING);
}
} else {
arg = MagicValue(JS_OPTIMIZED_OUT);
}
JSAutoByteString valueBytes;
const char* value = FormatValue(cx, arg, valueBytes);
if (!value) {
if (cx->isThrowingOutOfMemory())
return nullptr;
cx->clearPendingException();
}
JSAutoByteString nameBytes;
const char* name = nullptr;
if (i < iter.numFormalArgs()) {
MOZ_ASSERT(fi.argumentSlot() == i);
if (!fi.isDestructured()) {
name = nameBytes.encodeLatin1(cx, fi.name());
if (!name)
return nullptr;
} else {
name = "(destructured parameter)";
}
fi++;
}
if (value) {
buf = sprintf_append(cx, std::move(buf), "%s%s%s%s%s%s",
!first ? ", " : "",
name ? name :"",
name ? " = " : "",
arg.isString() ? "\"" : "",
value,
arg.isString() ? "\"" : "");
if (!buf)
return nullptr;
first = false;
} else {
buf = sprintf_append(cx, std::move(buf),
" <Failed to get argument while inspecting stack frame>\n");
if (!buf)
return nullptr;
}
}
}
// print filename and line number
buf = sprintf_append(cx, std::move(buf), "%s [\"%s\":%d]\n",
fun ? ")" : "",
filename ? filename : "<unknown>",
lineno);
if (!buf)
return nullptr;
// Note: Right now we don't dump the local variables anymore, because
// that is hard to support across all the JITs etc.
// print the value of 'this'
if (showLocals) {
if (!thisVal.isUndefined()) {
JSAutoByteString thisValBytes;
RootedString thisValStr(cx, ToString<CanGC>(cx, thisVal));
if (!thisValStr) {
if (cx->isThrowingOutOfMemory())
return nullptr;
cx->clearPendingException();
}
if (thisValStr) {
const char* str = thisValBytes.encodeLatin1(cx, thisValStr);
if (!str)
return nullptr;
buf = sprintf_append(cx, std::move(buf), " this = %s\n", str);
} else {
buf = sprintf_append(cx, std::move(buf), " <failed to get 'this' value>\n");
}
if (!buf)
return nullptr;
}
}
if (showThisProps && thisVal.isObject()) {
RootedObject obj(cx, &thisVal.toObject());
AutoIdVector keys(cx);
if (!GetPropertyKeys(cx, obj, JSITER_OWNONLY, &keys)) {
if (cx->isThrowingOutOfMemory())
return nullptr;
cx->clearPendingException();
}
RootedId id(cx);
for (size_t i = 0; i < keys.length(); i++) {
RootedId id(cx, keys[i]);
RootedValue key(cx, IdToValue(id));
RootedValue v(cx);
if (!GetProperty(cx, obj, obj, id, &v)) {
if (cx->isThrowingOutOfMemory())
return nullptr;
cx->clearPendingException();
buf = sprintf_append(cx, std::move(buf),
" <Failed to fetch property while inspecting stack frame>\n");
if (!buf)
return nullptr;
continue;
}
JSAutoByteString nameBytes;
const char* name = FormatValue(cx, key, nameBytes);
if (!name) {
if (cx->isThrowingOutOfMemory())
return nullptr;
cx->clearPendingException();
}
JSAutoByteString valueBytes;
const char* value = FormatValue(cx, v, valueBytes);
if (!value) {
if (cx->isThrowingOutOfMemory())
return nullptr;
cx->clearPendingException();
}
if (name && value) {
buf = sprintf_append(cx, std::move(buf), " this.%s = %s%s%s\n",
name,
v.isString() ? "\"" : "",
value,
v.isString() ? "\"" : "");
} else {
buf = sprintf_append(cx, std::move(buf),
" <Failed to format values while inspecting stack frame>\n");
}
if (!buf)
return nullptr;
}
}
MOZ_ASSERT(!cx->isExceptionPending());
return buf;
}
static JS::UniqueChars
FormatWasmFrame(JSContext* cx, const FrameIter& iter, JS::UniqueChars&& inBuf, int num)
{
UniqueChars nameStr;
if (JSAtom* functionDisplayAtom = iter.maybeFunctionDisplayAtom()) {
nameStr = StringToNewUTF8CharsZ(cx, *functionDisplayAtom);
if (!nameStr)
return nullptr;
}
JS::UniqueChars buf = sprintf_append(cx, std::move(inBuf), "%d %s()",
num,
nameStr ? nameStr.get() : "<wasm-function>");
if (!buf)
return nullptr;
buf = sprintf_append(cx, std::move(buf), " [\"%s\":wasm-function[%d]:0x%x]\n",
iter.filename() ? iter.filename() : "<unknown>",
iter.wasmFuncIndex(),
iter.wasmBytecodeOffset());
if (!buf)
return nullptr;
MOZ_ASSERT(!cx->isExceptionPending());
return buf;
}
JS_FRIEND_API(JS::UniqueChars)
JS::FormatStackDump(JSContext* cx, JS::UniqueChars&& inBuf, bool showArgs, bool showLocals,
bool showThisProps)
{
int num = 0;
JS::UniqueChars buf(std::move(inBuf));
for (AllFramesIter i(cx); !i.done(); ++i) {
if (i.hasScript())
buf = FormatFrame(cx, i, std::move(buf), num, showArgs, showLocals, showThisProps);
else
buf = FormatWasmFrame(cx, i, std::move(buf), num);
if (!buf)
return nullptr;
num++;
}
if (!num)
buf = JS_sprintf_append(std::move(buf), "JavaScript stack is empty\n");
return buf;
}
extern JS_FRIEND_API(bool)
JS::ForceLexicalInitialization(JSContext *cx, HandleObject obj)
{
AssertHeapIsIdle();
CHECK_REQUEST(cx);
cx->check(obj);
bool initializedAny = false;
NativeObject* nobj = &obj->as<NativeObject>();
for (Shape::Range<NoGC> r(nobj->lastProperty()); !r.empty(); r.popFront()) {
Shape* s = &r.front();
Value v = nobj->getSlot(s->slot());
if (s->isDataProperty() && v.isMagic() && v.whyMagic() == JS_UNINITIALIZED_LEXICAL) {
nobj->setSlot(s->slot(), UndefinedValue());
initializedAny = true;
}
}
return initializedAny;
}
extern JS_FRIEND_API(int)
JS::IsGCPoisoning()
{
#ifdef JS_GC_POISONING
return !js::gDisablePoisoning;
#else
return false;
#endif
}
struct DumpHeapTracer : public JS::CallbackTracer, public WeakMapTracer
{
const char* prefix;
FILE* output;
DumpHeapTracer(FILE* fp, JSContext* cx)
: JS::CallbackTracer(cx, DoNotTraceWeakMaps),
js::WeakMapTracer(cx->runtime()), prefix(""), output(fp)
{}
private:
void trace(JSObject* map, JS::GCCellPtr key, JS::GCCellPtr value) override {
JSObject* kdelegate = nullptr;
if (key.is<JSObject>())
kdelegate = js::GetWeakmapKeyDelegate(&key.as<JSObject>());
fprintf(output, "WeakMapEntry map=%p key=%p keyDelegate=%p value=%p\n",
map, key.asCell(), kdelegate, value.asCell());
}
void onChild(const JS::GCCellPtr& thing) override;
};
static char
MarkDescriptor(void* thing)
{
gc::TenuredCell* cell = gc::TenuredCell::fromPointer(thing);
if (cell->isMarkedBlack())
return 'B';
if (cell->isMarkedGray())
return 'G';
if (cell->isMarkedAny())
return 'X';
return 'W';
}
static void
DumpHeapVisitZone(JSRuntime* rt, void* data, Zone* zone)
{
DumpHeapTracer* dtrc = static_cast<DumpHeapTracer*>(data);
fprintf(dtrc->output, "# zone %p\n", (void*)zone);
}
static void
DumpHeapVisitRealm(JSContext* cx, void* data, Handle<Realm*> realm)
{
char name[1024];
if (auto nameCallback = cx->runtime()->realmNameCallback)
nameCallback(cx, realm, name, sizeof(name));
else
strcpy(name, "<unknown>");
DumpHeapTracer* dtrc = static_cast<DumpHeapTracer*>(data);
fprintf(dtrc->output, "# realm %s [in compartment %p, zone %p]\n", name,
(void*)realm->compartment(), (void*)realm->zone());
}
static void
DumpHeapVisitArena(JSRuntime* rt, void* data, gc::Arena* arena,
JS::TraceKind traceKind, size_t thingSize)
{
DumpHeapTracer* dtrc = static_cast<DumpHeapTracer*>(data);
fprintf(dtrc->output, "# arena allockind=%u size=%u\n",
unsigned(arena->getAllocKind()), unsigned(thingSize));
}
static void
DumpHeapVisitCell(JSRuntime* rt, void* data, void* thing,
JS::TraceKind traceKind, size_t thingSize)
{
DumpHeapTracer* dtrc = static_cast<DumpHeapTracer*>(data);
char cellDesc[1024 * 32];
JS_GetTraceThingInfo(cellDesc, sizeof(cellDesc), dtrc, thing, traceKind, true);
fprintf(dtrc->output, "%p %c %s\n", thing, MarkDescriptor(thing), cellDesc);
js::TraceChildren(dtrc, thing, traceKind);
}
void
DumpHeapTracer::onChild(const JS::GCCellPtr& thing)
{
if (gc::IsInsideNursery(thing.asCell()))
return;
char buffer[1024];
getTracingEdgeName(buffer, sizeof(buffer));
fprintf(output, "%s%p %c %s\n", prefix, thing.asCell(), MarkDescriptor(thing.asCell()), buffer);
}
void
js::DumpHeap(JSContext* cx, FILE* fp, js::DumpHeapNurseryBehaviour nurseryBehaviour)
{
if (nurseryBehaviour == js::CollectNurseryBeforeDump)
cx->runtime()->gc.evictNursery(JS::gcreason::API);
DumpHeapTracer dtrc(fp, cx);
fprintf(dtrc.output, "# Roots.\n");
{
JSRuntime* rt = cx->runtime();
js::gc::AutoTraceSession session(rt);
gcstats::AutoPhase ap(rt->gc.stats(), gcstats::PhaseKind::TRACE_HEAP);
rt->gc.traceRuntime(&dtrc, session);
}
fprintf(dtrc.output, "# Weak maps.\n");
WeakMapBase::traceAllMappings(&dtrc);
fprintf(dtrc.output, "==========\n");
dtrc.prefix = "> ";
IterateHeapUnbarriered(cx, &dtrc,
DumpHeapVisitZone,
DumpHeapVisitRealm,
DumpHeapVisitArena,
DumpHeapVisitCell);
fflush(dtrc.output);
}
JS_FRIEND_API(void)
js::SetActivityCallback(JSContext* cx, ActivityCallback cb, void* arg)
{
cx->activityCallback = cb;
cx->activityCallbackArg = arg;
}
JS_FRIEND_API(void)
JS::NotifyGCRootsRemoved(JSContext* cx)
{
cx->runtime()->gc.notifyRootsRemoved();
}
JS_FRIEND_API(JS::Realm*)
js::GetAnyRealmInZone(JS::Zone* zone)
{
if (zone->isAtomsZone())
return nullptr;
RealmsInZoneIter realm(zone);
MOZ_ASSERT(!realm.done());
return realm.get();
}
void
JS::ObjectPtr::finalize(JSRuntime* rt)
{
if (IsIncrementalBarrierNeeded(rt->mainContextFromOwnThread()))
IncrementalPreWriteBarrier(value);
value = nullptr;
}
void
JS::ObjectPtr::finalize(JSContext* cx)
{
finalize(cx->runtime());
}
void
JS::ObjectPtr::updateWeakPointerAfterGC()
{
if (js::gc::IsAboutToBeFinalizedUnbarriered(value.unsafeGet()))
value = nullptr;
}
void
JS::ObjectPtr::trace(JSTracer* trc, const char* name)
{
JS::TraceEdge(trc, &value, name);
}
JS_FRIEND_API(JSObject*)
js::GetTestingFunctions(JSContext* cx)
{
RootedObject obj(cx, JS_NewPlainObject(cx));
if (!obj)
return nullptr;
if (!DefineTestingFunctions(cx, obj, false, false))
return nullptr;
return obj;
}
JS_FRIEND_API(void)
js::SetDOMCallbacks(JSContext* cx, const DOMCallbacks* callbacks)
{
cx->runtime()->DOMcallbacks = callbacks;
}
JS_FRIEND_API(const DOMCallbacks*)
js::GetDOMCallbacks(JSContext* cx)
{
return cx->runtime()->DOMcallbacks;
}
static const void* gDOMProxyHandlerFamily = nullptr;
static DOMProxyShadowsCheck gDOMProxyShadowsCheck;
JS_FRIEND_API(void)
js::SetDOMProxyInformation(const void* domProxyHandlerFamily,
DOMProxyShadowsCheck domProxyShadowsCheck)
{
gDOMProxyHandlerFamily = domProxyHandlerFamily;
gDOMProxyShadowsCheck = domProxyShadowsCheck;
}
const void*
js::GetDOMProxyHandlerFamily()
{
return gDOMProxyHandlerFamily;
}
DOMProxyShadowsCheck
js::GetDOMProxyShadowsCheck()
{
return gDOMProxyShadowsCheck;
}
static XrayJitInfo* gXrayJitInfo = nullptr;
JS_FRIEND_API(void)
js::SetXrayJitInfo(XrayJitInfo* info)
{
gXrayJitInfo = info;
}
XrayJitInfo*
js::GetXrayJitInfo()
{
return gXrayJitInfo;
}
bool
js::detail::IdMatchesAtom(jsid id, JSAtom* atom)
{
return id == INTERNED_STRING_TO_JSID(nullptr, atom);
}
bool
js::detail::IdMatchesAtom(jsid id, JSString* atom)
{
return id == INTERNED_STRING_TO_JSID(nullptr, atom);
}
JS_FRIEND_API(void)
js::PrepareScriptEnvironmentAndInvoke(JSContext* cx, HandleObject global,
ScriptEnvironmentPreparer::Closure& closure)
{
MOZ_ASSERT(!cx->isExceptionPending());
MOZ_ASSERT(global->is<GlobalObject>());
MOZ_RELEASE_ASSERT(cx->runtime()->scriptEnvironmentPreparer,
"Embedding needs to set a scriptEnvironmentPreparer callback");
cx->runtime()->scriptEnvironmentPreparer->invoke(global, closure);
}
JS_FRIEND_API(void)
js::SetScriptEnvironmentPreparer(JSContext* cx, ScriptEnvironmentPreparer* preparer)
{
cx->runtime()->scriptEnvironmentPreparer = preparer;
}
JS_FRIEND_API(void)
js::SetCTypesActivityCallback(JSContext* cx, CTypesActivityCallback cb)
{
cx->runtime()->ctypesActivityCallback = cb;
}
js::AutoCTypesActivityCallback::AutoCTypesActivityCallback(JSContext* cx,
js::CTypesActivityType beginType,
js::CTypesActivityType endType
MOZ_GUARD_OBJECT_NOTIFIER_PARAM_IN_IMPL)
: cx(cx), callback(cx->runtime()->ctypesActivityCallback), endType(endType)
{
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
if (callback)
callback(cx, beginType);
}
JS_FRIEND_API(void)
js::SetAllocationMetadataBuilder(JSContext* cx, const AllocationMetadataBuilder* callback)
{
cx->realm()->setAllocationMetadataBuilder(callback);
}
JS_FRIEND_API(JSObject*)
js::GetAllocationMetadata(JSObject* obj)
{
ObjectWeakMap* map = ObjectRealm::get(obj).objectMetadataTable.get();
if (map)
return map->lookup(obj);
return nullptr;
}
JS_FRIEND_API(bool)
js::ReportIsNotFunction(JSContext* cx, HandleValue v)
{
cx->check(v);
return ReportIsNotFunction(cx, v, -1);
}
#ifdef DEBUG
bool
js::HasObjectMovedOp(JSObject* obj) {
return !!GetObjectClass(obj)->extObjectMovedOp();
}
#endif
JS_FRIEND_API(bool)
js::ForwardToNative(JSContext* cx, JSNative native, const CallArgs& args)
{
return native(cx, args.length(), args.base());
}
JS_FRIEND_API(JSObject*)
js::ConvertArgsToArray(JSContext* cx, const CallArgs& args)
{
RootedObject argsArray(cx, NewDenseCopiedArray(cx, args.length(), args.array()));
return argsArray;
}
JS_FRIEND_API(JSAtom*)
js::GetPropertyNameFromPC(JSScript* script, jsbytecode* pc)
{
if (!IsGetPropPC(pc) && !IsSetPropPC(pc))
return nullptr;
return script->getName(pc);
}
JS_FRIEND_API(void)
js::SetWindowProxyClass(JSContext* cx, const js::Class* clasp)
{
MOZ_ASSERT(!cx->runtime()->maybeWindowProxyClass());
cx->runtime()->setWindowProxyClass(clasp);
}
JS_FRIEND_API(void)
js::SetWindowProxy(JSContext* cx, HandleObject global, HandleObject windowProxy)
{
AssertHeapIsIdle();
CHECK_REQUEST(cx);
cx->check(global, windowProxy);
MOZ_ASSERT(IsWindowProxy(windowProxy));
global->as<GlobalObject>().setWindowProxy(windowProxy);
}
JS_FRIEND_API(JSObject*)
js::ToWindowIfWindowProxy(JSObject* obj)
{
if (IsWindowProxy(obj))
return &obj->nonCCWGlobal();
return obj;
}
JS_FRIEND_API(JSObject*)
js::detail::ToWindowProxyIfWindowSlow(JSObject* obj)
{
if (JSObject* windowProxy = obj->as<GlobalObject>().maybeWindowProxy())
return windowProxy;
return obj;
}
JS_FRIEND_API(bool)
js::IsWindowProxy(JSObject* obj)
{
// Note: simply checking `obj == obj->global().windowProxy()` is not
// sufficient: we may have transplanted the window proxy with a CCW.
// Check the Class to ensure we really have a window proxy.
return obj->getClass() == obj->runtimeFromAnyThread()->maybeWindowProxyClass();
}
JS_FRIEND_API(bool)
js::detail::IsWindowSlow(JSObject* obj)
{
return obj->as<GlobalObject>().maybeWindowProxy();
}
AutoAssertNoContentJS::AutoAssertNoContentJS(JSContext* cx)
: context_(cx),
prevAllowContentJS_(cx->runtime()->allowContentJS_)
{
cx->runtime()->allowContentJS_ = false;
}
AutoAssertNoContentJS::~AutoAssertNoContentJS()
{
context_->runtime()->allowContentJS_ = prevAllowContentJS_;
}
JS_FRIEND_API(void)
js::EnableAccessValidation(JSContext* cx, bool enabled)
{
cx->enableAccessValidation = enabled;
}
JS_FRIEND_API(void)
js::SetRealmValidAccessPtr(JSContext* cx, JS::HandleObject global, bool* accessp)
{
MOZ_ASSERT(global->is<GlobalObject>());
global->as<GlobalObject>().realm()->setValidAccessPtr(accessp);
}
JS_FRIEND_API(bool)
js::SystemZoneAvailable(JSContext* cx)
{
return true;
}
static LogCtorDtor sLogCtor = nullptr;
static LogCtorDtor sLogDtor = nullptr;
JS_FRIEND_API(void)
js::SetLogCtorDtorFunctions(LogCtorDtor ctor, LogCtorDtor dtor)
{
MOZ_ASSERT(!sLogCtor && !sLogDtor);
MOZ_ASSERT(ctor && dtor);
sLogCtor = ctor;
sLogDtor = dtor;
}
JS_FRIEND_API(void)
js::LogCtor(void* self, const char* type, uint32_t sz)
{
if (LogCtorDtor fun = sLogCtor)
fun(self, type, sz);
}
JS_FRIEND_API(void)
js::LogDtor(void* self, const char* type, uint32_t sz)
{
if (LogCtorDtor fun = sLogDtor)
fun(self, type, sz);
}
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