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Mypal/js/src/jsfriendapi.cpp

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/* -*- Mode: C++; tab-width: 8; 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/. */
#include "jsfriendapi.h"
#include "mozilla/PodOperations.h"
#include <stdint.h>
#include "jscntxt.h"
#include "jscompartment.h"
#include "jsgc.h"
#include "jsobj.h"
#include "jsprf.h"
#include "jsweakmap.h"
#include "jswrapper.h"
#include "builtin/Promise.h"
#include "builtin/TestingFunctions.h"
#include "js/Proxy.h"
#include "proxy/DeadObjectProxy.h"
#include "vm/ArgumentsObject.h"
#include "vm/Time.h"
#include "vm/WrapperObject.h"
#include "jsobjinlines.h"
#include "jsscriptinlines.h"
#include "vm/EnvironmentObject-inl.h"
#include "vm/NativeObject-inl.h"
using namespace js;
using mozilla::Move;
using mozilla::PodArrayZero;
js::ContextFriendFields::ContextFriendFields(bool isJSContext)
: JS::RootingContext(isJSContext),
compartment_(nullptr), zone_(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->sourceHook = Move(hook);
}
JS_FRIEND_API(mozilla::UniquePtr<SourceHook>)
js::ForgetSourceHook(JSContext* cx)
{
return Move(cx->sourceHook);
}
JS_FRIEND_API(void)
JS_SetGrayGCRootsTracer(JSContext* cx, JSTraceDataOp traceOp, void* data)
{
cx->gc.setGrayRootsTracer(traceOp, data);
}
JS_FRIEND_API(JSObject*)
JS_FindCompilationScope(JSContext* cx, HandleObject 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);
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, (const js::Class*)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)
{
AutoSuppressAllocationMetadataBuilder suppressMetadata(cx);
return JS_NewObjectWithGivenProto(cx, clasp, proto);
}
JS_FRIEND_API(bool)
JS_GetIsSecureContext(JSCompartment* compartment)
{
return compartment->creationOptions().secureContext();
}
JS_FRIEND_API(JSPrincipals*)
JS_GetCompartmentPrincipals(JSCompartment* compartment)
{
return compartment->principals();
}
JS_FRIEND_API(void)
JS_SetCompartmentPrincipals(JSCompartment* compartment, JSPrincipals* principals)
{
// Short circuit if there's no change.
if (principals == compartment->principals())
return;
// Any compartment with the trusted principals -- and there can be
// multiple -- is a system compartment.
const JSPrincipals* trusted = compartment->runtimeFromMainThread()->trustedPrincipals();
bool isSystem = principals && principals == trusted;
// Clear out the old principals, if any.
if (compartment->principals()) {
JS_DropPrincipals(compartment->contextFromMainThread(), compartment->principals());
compartment->setPrincipals(nullptr);
// 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.
MOZ_ASSERT(compartment->isSystem() == isSystem);
}
// Set up the new principals.
if (principals) {
JS_HoldPrincipals(principals);
compartment->setPrincipals(principals);
}
// Update the system flag.
compartment->setIsSystem(isSystem);
}
JS_FRIEND_API(JSPrincipals*)
JS_GetScriptPrincipals(JSScript* script)
{
return script->principals();
}
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_STUBGETTER, JS_STUBSETTER);
}
JS_FRIEND_API(bool)
JS_DefineFunctionsWithHelp(JSContext* cx, HandleObject obj, const JSFunctionSpecWithHelp* fs)
{
MOZ_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
CHECK_REQUEST(cx);
assertSameCompartment(cx, 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));
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>() || obj->is<UnboxedArrayObject>())
*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;
else
*cls = ESClass::Other;
return true;
}
JS_FRIEND_API(const char*)
js::ObjectClassName(JSContext* cx, HandleObject obj)
{
return GetObjectClassName(cx, obj);
}
JS_FRIEND_API(JS::Zone*)
js::GetCompartmentZone(JSCompartment* comp)
{
return comp->zone();
}
JS_FRIEND_API(bool)
js::IsSystemCompartment(JSCompartment* comp)
{
return comp->isSystem();
}
JS_FRIEND_API(bool)
js::IsSystemZone(Zone* zone)
{
return zone->isSystem;
}
JS_FRIEND_API(bool)
js::IsAtomsCompartment(JSCompartment* comp)
{
return comp->runtimeFromAnyThread()->isAtomsCompartment(comp);
}
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(JSObject*)
js::GetGlobalForObjectCrossCompartment(JSObject* obj)
{
return &obj->global();
}
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)
{
assertSameCompartment(cx, obj);
}
#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)
{
int64_t timeNow = PRMJ_Now();
obj->compartment()->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::GetOutermostEnclosingFunctionOfScriptedCaller(JSContext* cx)
{
ScriptFrameIter iter(cx);
// Skip eval frames.
while (!iter.done() && iter.isEvalFrame())
++iter;
if (iter.done())
return nullptr;
if (!iter.isFunctionFrame())
return nullptr;
if (iter.compartment() != cx->compartment())
return nullptr;
RootedFunction curr(cx, iter.callee(cx));
for (ScopeIter si(curr->nonLazyScript()); si; si++) {
if (si.kind() == ScopeKind::Function)
curr = si.scope()->as<FunctionScope>().canonicalFunction();
}
assertSameCompartment(cx, curr);
return curr;
}
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->runtime()->isAtomsCompartment(cx->compartment()));
CHECK_REQUEST(cx);
assertSameCompartment(cx, 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->runtime()->isAtomsCompartment(cx->compartment()));
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->runtime()->isAtomsCompartment(cx->compartment()));
CHECK_REQUEST(cx);
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)
{
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::GetOriginalEval(JSContext* cx, HandleObject scope, MutableHandleObject eval)
{
assertSameCompartment(cx, scope);
Rooted<GlobalObject*> global(cx, &scope->global());
return GlobalObject::getOrCreateEval(cx, global, eval);
}
JS_FRIEND_API(void)
js::SetReservedOrProxyPrivateSlotWithBarrier(JSObject* obj, size_t slot, const js::Value& value)
{
if (IsProxy(obj)) {
MOZ_ASSERT(slot == 0);
obj->as<ProxyObject>().setSameCompartmentPrivate(value);
} else {
obj->as<NativeObject>().setSlot(slot, value);
}
}
void
js::SetPreserveWrapperCallback(JSContext* cx, PreserveWrapperCallback callback)
{
cx->preserveWrapperCallback = callback;
}
namespace js {
// Defined in vm/GlobalObject.cpp.
extern size_t sSetProtoCalled;
} // namespace js
JS_FRIEND_API(size_t)
JS_SetProtoCalled(JSContext*)
{
return sSetProtoCalled;
}
// Defined in jsiter.cpp.
extern size_t sCustomIteratorCount;
JS_FRIEND_API(size_t)
JS_GetCustomIteratorCount(JSContext* cx)
{
return sCustomIteratorCount;
}
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);
}
void
js::TraceWeakMaps(WeakMapTracer* trc)
{
WeakMapBase::traceAllMappings(trc);
}
extern JS_FRIEND_API(bool)
js::AreGCGrayBitsValid(JSContext* cx)
{
return cx->areGCGrayBitsValid();
}
JS_FRIEND_API(bool)
js::ZoneGlobalsAreAllGray(JS::Zone* zone)
{
for (CompartmentsInZoneIter comp(zone); !comp.done(); comp.next()) {
JSObject* obj = comp->unsafeUnbarrieredMaybeGlobal();
if (!obj || !JS::ObjectIsMarkedGray(obj))
return false;
}
return true;
}
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)->isTenured() && (*tp)->asTenured().isMarked(gc::GRAY))
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 (JSCompartment::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(JSObject*)
JS_CloneObject(JSContext* cx, HandleObject obj, HandleObject protoArg)
{
Rooted<TaggedProto> proto(cx, TaggedProto(protoArg.get()));
return CloneObject(cx, obj, proto);
}
#ifdef DEBUG
JS_FRIEND_API(void)
js::DumpString(JSString* str, FILE* fp)
{
str->dump(fp);
}
JS_FRIEND_API(void)
js::DumpAtom(JSAtom* atom, FILE* fp)
{
atom->dump(fp);
}
JS_FRIEND_API(void)
js::DumpChars(const char16_t* s, size_t n, FILE* fp)
{
fprintf(fp, "char16_t * (%p) = ", (void*) s);
JSString::dumpChars(s, n, fp);
fputc('\n', fp);
}
JS_FRIEND_API(void)
js::DumpObject(JSObject* obj, FILE* fp)
{
if (!obj) {
fprintf(fp, "NULL\n");
return;
}
obj->dump(fp);
}
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)
{
DumpInterpreterFrame(cx, stderr, 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<AutoCompartment> here, but G++ can't quite follow
* that, and warns about uninitialized members being used in the
* destructor.
*/
RootedString str(cx);
if (v.isObject()) {
AutoCompartment ac(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 char*
MOZ_FORMAT_PRINTF(3, 4)
sprintf_append(JSContext* cx, char* buf, const char* fmt, ...)
{
va_list ap;
va_start(ap, fmt);
char* result = JS_vsprintf_append(buf, fmt, ap);
va_end(ap);
if (!result) {
ReportOutOfMemory(cx);
return nullptr;
}
return result;
}
static char*
FormatFrame(JSContext* cx, const FrameIter& iter, char* buf, 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));
JSAutoCompartment ac(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
if (funname) {
JSAutoByteString funbytes;
char* str = funbytes.encodeLatin1(cx, funname);
if (!str)
return nullptr;
buf = sprintf_append(cx, buf, "%d %s(", num, str);
} else if (fun) {
buf = sprintf_append(cx, buf, "%d anonymous(", num);
} else {
buf = sprintf_append(cx, 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, 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, buf,
" <Failed to get argument while inspecting stack frame>\n");
if (!buf)
return nullptr;
}
}
}
// print filename and line number
buf = sprintf_append(cx, 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, buf, " this = %s\n", str);
} else {
buf = sprintf_append(cx, 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, 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, buf, " this.%s = %s%s%s\n",
name,
v.isString() ? "\"" : "",
value,
v.isString() ? "\"" : "");
} else {
buf = sprintf_append(cx, buf,
" <Failed to format values while inspecting stack frame>\n");
}
if (!buf)
return nullptr;
}
}
MOZ_ASSERT(!cx->isExceptionPending());
return buf;
}
static char*
FormatWasmFrame(JSContext* cx, const FrameIter& iter, char* buf, int num, bool showArgs)
{
JSAtom* functionDisplayAtom = iter.functionDisplayAtom();
UniqueChars nameStr;
if (functionDisplayAtom)
nameStr = StringToNewUTF8CharsZ(cx, *functionDisplayAtom);
buf = sprintf_append(cx, buf, "%d %s()",
num,
nameStr ? nameStr.get() : "<wasm-function>");
if (!buf)
return nullptr;
const char* filename = iter.filename();
uint32_t lineno = iter.computeLine();
buf = sprintf_append(cx, buf, " [\"%s\":%d]\n",
filename ? filename : "<unknown>",
lineno);
MOZ_ASSERT(!cx->isExceptionPending());
return buf;
}
JS_FRIEND_API(char*)
JS::FormatStackDump(JSContext* cx, char* buf, bool showArgs, bool showLocals, bool showThisProps)
{
int num = 0;
for (AllFramesIter i(cx); !i.done(); ++i) {
if (i.hasScript())
buf = FormatFrame(cx, i, buf, num, showArgs, showLocals, showThisProps);
else
buf = FormatWasmFrame(cx, i, buf, num, showArgs);
if (!buf)
return nullptr;
num++;
}
if (!num)
buf = JS_sprintf_append(buf, "JavaScript stack is empty\n");
return buf;
}
extern JS_FRIEND_API(bool)
JS::ForceLexicalInitialization(JSContext *cx, HandleObject obj)
{
AssertHeapIsIdle(cx);
CHECK_REQUEST(cx);
assertSameCompartment(cx, 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->hasSlot() && v.isMagic() && v.whyMagic() == JS_UNINITIALIZED_LEXICAL) {
nobj->setSlot(s->slot(), UndefinedValue());
initializedAny = true;
}
}
return initializedAny;
}
struct DumpHeapTracer : public JS::CallbackTracer, public WeakMapTracer
{
const char* prefix;
FILE* output;
DumpHeapTracer(FILE* fp, JSContext* cx)
: JS::CallbackTracer(cx, DoNotTraceWeakMaps),
js::WeakMapTracer(cx), 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->isMarked(gc::BLACK))
return cell->isMarked(gc::GRAY) ? 'G' : 'B';
else
return cell->isMarked(gc::GRAY) ? 'X' : '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
DumpHeapVisitCompartment(JSContext* cx, void* data, JSCompartment* comp)
{
char name[1024];
if (cx->compartmentNameCallback)
(*cx->compartmentNameCallback)(cx, comp, name, sizeof(name));
else
strcpy(name, "<unknown>");
DumpHeapTracer* dtrc = static_cast<DumpHeapTracer*>(data);
fprintf(dtrc->output, "# compartment %s [in zone %p]\n", name, (void*)comp->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->gc.evictNursery(JS::gcreason::API);
DumpHeapTracer dtrc(fp, cx);
fprintf(dtrc.output, "# Roots.\n");
TraceRuntime(&dtrc);
fprintf(dtrc.output, "# Weak maps.\n");
WeakMapBase::traceAllMappings(&dtrc);
fprintf(dtrc.output, "==========\n");
dtrc.prefix = "> ";
IterateZonesCompartmentsArenasCells(cx, &dtrc,
DumpHeapVisitZone,
DumpHeapVisitCompartment,
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::NotifyDidPaint(JSContext* cx)
{
cx->gc.notifyDidPaint();
}
JS_FRIEND_API(void)
JS::PokeGC(JSContext* cx)
{
cx->gc.poke();
}
JS_FRIEND_API(JSCompartment*)
js::GetAnyCompartmentInZone(JS::Zone* zone)
{
CompartmentsInZoneIter comp(zone);
MOZ_ASSERT(!comp.done());
return comp.get();
}
void
JS::ObjectPtr::finalize(JSRuntime* rt)
{
if (IsIncrementalBarrierNeeded(rt->contextFromMainThread()))
IncrementalObjectBarrier(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;
}
#ifdef DEBUG
JS_FRIEND_API(unsigned)
js::GetEnterCompartmentDepth(JSContext* cx)
{
return cx->getEnterCompartmentDepth();
}
#endif
JS_FRIEND_API(void)
js::SetDOMCallbacks(JSContext* cx, const DOMCallbacks* callbacks)
{
cx->DOMcallbacks = callbacks;
}
JS_FRIEND_API(const DOMCallbacks*)
js::GetDOMCallbacks(JSContext* cx)
{
return cx->DOMcallbacks;
}
static const void* gDOMProxyHandlerFamily = nullptr;
static uint32_t gDOMProxyExpandoSlot = 0;
static DOMProxyShadowsCheck gDOMProxyShadowsCheck;
JS_FRIEND_API(void)
js::SetDOMProxyInformation(const void* domProxyHandlerFamily, uint32_t domProxyExpandoSlot,
DOMProxyShadowsCheck domProxyShadowsCheck)
{
gDOMProxyHandlerFamily = domProxyHandlerFamily;
gDOMProxyExpandoSlot = domProxyExpandoSlot;
gDOMProxyShadowsCheck = domProxyShadowsCheck;
}
const void*
js::GetDOMProxyHandlerFamily()
{
return gDOMProxyHandlerFamily;
}
uint32_t
js::GetDOMProxyExpandoSlot()
{
return gDOMProxyExpandoSlot;
}
DOMProxyShadowsCheck
js::GetDOMProxyShadowsCheck()
{
return gDOMProxyShadowsCheck;
}
bool
js::detail::IdMatchesAtom(jsid id, JSAtom* atom)
{
return id == INTERNED_STRING_TO_JSID(nullptr, atom);
}
JS_FRIEND_API(void)
js::PrepareScriptEnvironmentAndInvoke(JSContext* cx, HandleObject scope, ScriptEnvironmentPreparer::Closure& closure)
{
MOZ_ASSERT(!cx->isExceptionPending());
MOZ_RELEASE_ASSERT(cx->runtime()->scriptEnvironmentPreparer,
"Embedding needs to set a scriptEnvironmentPreparer callback");
cx->runtime()->scriptEnvironmentPreparer->invoke(scope, closure);
}
JS_FRIEND_API(void)
js::SetScriptEnvironmentPreparer(JSContext* cx, ScriptEnvironmentPreparer* preparer)
{
cx->scriptEnvironmentPreparer = preparer;
}
JS_FRIEND_API(void)
js::SetCTypesActivityCallback(JSContext* cx, CTypesActivityCallback cb)
{
cx->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->compartment()->setAllocationMetadataBuilder(callback);
}
JS_FRIEND_API(JSObject*)
js::GetAllocationMetadata(JSObject* obj)
{
ObjectWeakMap* map = obj->compartment()->objectMetadataTable;
if (map)
return map->lookup(obj);
return nullptr;
}
JS_FRIEND_API(bool)
js::ReportIsNotFunction(JSContext* cx, HandleValue v)
{
return ReportIsNotFunction(cx, v, -1);
}
JS_FRIEND_API(void)
js::ReportASCIIErrorWithId(JSContext* cx, const char* msg, HandleId id)
{
RootedValue idv(cx);
if (!JS_IdToValue(cx, id, &idv))
return;
RootedString idstr(cx, JS::ToString(cx, idv));
if (!idstr)
return;
JSAutoByteString bytes;
if (!bytes.encodeUtf8(cx, idstr))
return;
JS_ReportErrorUTF8(cx, msg, bytes.ptr());
}
#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->maybeWindowProxyClass());
cx->setWindowProxyClass(clasp);
}
JS_FRIEND_API(void)
js::SetWindowProxy(JSContext* cx, HandleObject global, HandleObject windowProxy)
{
AssertHeapIsIdle(cx);
CHECK_REQUEST(cx);
assertSameCompartment(cx, global, windowProxy);
MOZ_ASSERT(IsWindowProxy(windowProxy));
global->as<GlobalObject>().setWindowProxy(windowProxy);
}
JS_FRIEND_API(JSObject*)
js::ToWindowIfWindowProxy(JSObject* obj)
{
if (IsWindowProxy(obj))
return &obj->global();
return obj;
}
JS_FRIEND_API(JSObject*)
js::ToWindowProxyIfWindow(JSObject* obj)
{
if (IsWindow(obj))
return obj->as<GlobalObject>().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();
}
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