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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: 2 -*-
* vim: set ts=8 sts=2 et sw=2 tw=80:
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "jsfriendapi.h"
#include "mozilla/Atomics.h"
#include "mozilla/Maybe.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/CharacterEncoding.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_THREAD(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 void js::AssertCompartmentHasSingleRealm(JS::Compartment* comp) {
MOZ_RELEASE_ASSERT(comp->realms().length() == 1);
}
JS_FRIEND_API JSPrincipals* JS_DeprecatedGetCompartmentPrincipals(
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.
js::AssertCompartmentHasSingleRealm(compartment);
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_THREAD(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 bool js::IsArgumentsObject(HandleObject obj) {
return obj->is<ArgumentsObject>();
}
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_THREAD(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_THREAD(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_THREAD(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);
}
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::IsCompartmentZoneSweepingOrCompacting(
JS::Compartment* comp) {
MOZ_ASSERT(comp);
return comp->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
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 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, HandleValue v,
UniqueChars& bytes) {
if (v.isMagic()) {
MOZ_ASSERT(v.whyMagic() == JS_OPTIMIZED_OUT ||
v.whyMagic() == JS_UNINITIALIZED_LEXICAL);
return "[unavailable]";
}
if (IsCallable(v)) {
return "[function]";
}
if (v.isObject() && IsCrossCompartmentWrapper(&v.toObject())) {
return "[cross-compartment wrapper]";
}
JSString* str;
{
mozilla::Maybe<AutoRealm> ar;
if (v.isObject()) {
ar.emplace(cx, &v.toObject());
}
str = ToString<CanGC>(cx, v);
if (!str) {
return nullptr;
}
}
bytes = StringToNewUTF8CharsZ(cx, *str);
return bytes.get();
}
static bool FormatFrame(JSContext* cx, const FrameIter& iter, Sprinter& sp,
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 column = 0;
unsigned lineno = PCToLineNumber(script, pc, &column);
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 false;
}
}
// print the frame number and function name
if (funname) {
UniqueChars funbytes = StringToNewUTF8CharsZ(cx, *funname);
if (!funbytes) {
return false;
}
if (!sp.printf("%d %s(", num, funbytes.get())) {
return false;
}
} else if (fun) {
if (!sp.printf("%d anonymous(", num)) {
return false;
}
} else {
if (!sp.printf("%d <TOP LEVEL>", num)) {
return false;
}
}
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()) {
if (iter.hasInitialEnvironment(cx)) {
arg = iter.callObj(cx).aliasedBinding(fi);
} else {
arg = MagicValue(JS_OPTIMIZED_OUT);
}
} 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);
}
UniqueChars valueBytes;
const char* value = FormatValue(cx, arg, valueBytes);
if (!value) {
if (cx->isThrowingOutOfMemory()) {
return false;
}
cx->clearPendingException();
}
UniqueChars nameBytes;
const char* name = nullptr;
if (i < iter.numFormalArgs()) {
MOZ_ASSERT(fi.argumentSlot() == i);
if (!fi.isDestructured()) {
nameBytes = StringToNewUTF8CharsZ(cx, *fi.name());
name = nameBytes.get();
if (!name) {
return false;
}
} else {
name = "(destructured parameter)";
}
fi++;
}
if (value) {
if (!sp.printf("%s%s%s%s%s%s", !first ? ", " : "", name ? name : "",
name ? " = " : "", arg.isString() ? "\"" : "", value,
arg.isString() ? "\"" : "")) {
return false;
}
first = false;
} else {
if (!sp.put(" <Failed to get argument while inspecting stack "
"frame>\n")) {
return false;
}
}
}
}
// print filename, line number and column
if (!sp.printf("%s [\"%s\":%d:%d]\n", fun ? ")" : "",
filename ? filename : "<unknown>", lineno, column)) {
return false;
}
// 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()) {
RootedString thisValStr(cx, ToString<CanGC>(cx, thisVal));
if (!thisValStr) {
if (cx->isThrowingOutOfMemory()) {
return false;
}
cx->clearPendingException();
}
if (thisValStr) {
UniqueChars thisValBytes = StringToNewUTF8CharsZ(cx, *thisValStr);
if (!thisValBytes) {
return false;
}
if (!sp.printf(" this = %s\n", thisValBytes.get())) {
return false;
}
} else {
if (!sp.put(" <failed to get 'this' value>\n")) {
return false;
}
}
}
}
if (showThisProps && thisVal.isObject()) {
RootedObject obj(cx, &thisVal.toObject());
AutoIdVector keys(cx);
if (!GetPropertyKeys(cx, obj, JSITER_OWNONLY, &keys)) {
if (cx->isThrowingOutOfMemory()) {
return false;
}
cx->clearPendingException();
}
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 false;
}
cx->clearPendingException();
if (!sp.put(" <Failed to fetch property while inspecting stack "
"frame>\n")) {
return false;
}
continue;
}
UniqueChars nameBytes;
const char* name = FormatValue(cx, key, nameBytes);
if (!name) {
if (cx->isThrowingOutOfMemory()) {
return false;
}
cx->clearPendingException();
}
UniqueChars valueBytes;
const char* value = FormatValue(cx, v, valueBytes);
if (!value) {
if (cx->isThrowingOutOfMemory()) {
return false;
}
cx->clearPendingException();
}
if (name && value) {
if (!sp.printf(" this.%s = %s%s%s\n", name, v.isString() ? "\"" : "",
value, v.isString() ? "\"" : "")) {
return false;
}
} else {
if (!sp.put(" <Failed to format values while inspecting stack "
"frame>\n")) {
return false;
}
}
}
}
MOZ_ASSERT(!cx->isExceptionPending());
return true;
}
static bool FormatWasmFrame(JSContext* cx, const FrameIter& iter, Sprinter& sp,
int num) {
UniqueChars nameStr;
if (JSAtom* functionDisplayAtom = iter.maybeFunctionDisplayAtom()) {
nameStr = StringToNewUTF8CharsZ(cx, *functionDisplayAtom);
if (!nameStr) {
return false;
}
}
if (!sp.printf("%d %s()", num, nameStr ? nameStr.get() : "<wasm-function>")) {
return false;
}
if (!sp.printf(" [\"%s\":wasm-function[%d]:0x%x]\n",
iter.filename() ? iter.filename() : "<unknown>",
iter.wasmFuncIndex(), iter.wasmBytecodeOffset())) {
return false;
}
MOZ_ASSERT(!cx->isExceptionPending());
return true;
}
JS_FRIEND_API JS::UniqueChars JS::FormatStackDump(JSContext* cx, bool showArgs,
bool showLocals,
bool showThisProps) {
int num = 0;
Sprinter sp(cx);
if (!sp.init()) {
return nullptr;
}
for (AllFramesIter i(cx); !i.done(); ++i) {
bool ok = i.hasScript() ? FormatFrame(cx, i, sp, num, showArgs, showLocals,
showThisProps)
: FormatWasmFrame(cx, i, sp, num);
if (!ok) {
return nullptr;
}
num++;
}
if (num == 0) {
if (!sp.put("JavaScript stack is empty\n")) {
return nullptr;
}
}
return sp.release();
}
extern JS_FRIEND_API bool JS::ForceLexicalInitialization(JSContext* cx,
HandleObject obj) {
AssertHeapIsIdle();
CHECK_THREAD(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 = UncheckedUnwrapWithoutExpose(&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::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();
}
JS_FRIEND_API JSObject* js::GetFirstGlobalInCompartment(JS::Compartment* comp) {
JSObject* global = comp->firstRealm()->maybeGlobal();
MOZ_ASSERT(global);
return global;
}
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_THREAD(cx);
cx->check(global, windowProxy);
MOZ_ASSERT(IsWindowProxy(windowProxy));
GlobalObject& globalObj = global->as<GlobalObject>();
globalObj.setWindowProxy(windowProxy);
globalObj.lexicalEnvironment().setWindowProxyThisValue(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);
}
}
JS_FRIEND_API JS::Value js::MaybeGetScriptPrivate(JSObject* object) {
if (!object->is<ScriptSourceObject>()) {
return UndefinedValue();
}
return object->as<ScriptSourceObject>().canonicalPrivate();
}
JS_FRIEND_API uint64_t js::GetGCHeapUsageForObjectZone(JSObject* obj) {
return obj->zone()->zoneSize.gcBytes();
}
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