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tenfourfox/dom/bindings/BindingUtils.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 "BindingUtils.h"
#include <algorithm>
#include <stdarg.h>
#include "mozilla/DebugOnly.h"
#include "mozilla/FloatingPoint.h"
#include "mozilla/Assertions.h"
#include "mozilla/Preferences.h"
#include "mozilla/unused.h"
#include "mozilla/UseCounter.h"
#include "AccessCheck.h"
#include "jsfriendapi.h"
#include "nsContentUtils.h"
#include "nsGlobalWindow.h"
#include "nsIDocShell.h"
#include "nsIDOMGlobalPropertyInitializer.h"
#include "nsIPermissionManager.h"
#include "nsIPrincipal.h"
#include "nsIXPConnect.h"
#include "nsUTF8Utils.h"
#include "WrapperFactory.h"
#include "xpcprivate.h"
#include "XrayWrapper.h"
#include "nsPrintfCString.h"
#include "prprf.h"
#include "nsGlobalWindow.h"
#include "mozilla/dom/ScriptSettings.h"
#include "mozilla/dom/DOMError.h"
#include "mozilla/dom/DOMErrorBinding.h"
#include "mozilla/dom/DOMException.h"
#include "mozilla/dom/ElementBinding.h"
#include "mozilla/dom/HTMLObjectElement.h"
#include "mozilla/dom/HTMLObjectElementBinding.h"
#include "mozilla/dom/HTMLSharedObjectElement.h"
#include "mozilla/dom/HTMLEmbedElementBinding.h"
#include "mozilla/dom/HTMLAppletElementBinding.h"
#include "mozilla/dom/Promise.h"
#include "mozilla/dom/ResolveSystemBinding.h"
#include "mozilla/jsipc/CrossProcessObjectWrappers.h"
#include "WorkerPrivate.h"
#include "nsDOMClassInfo.h"
#include "ipc/ErrorIPCUtils.h"
#include "mozilla/UseCounter.h"
namespace mozilla {
namespace dom {
JSErrorFormatString ErrorFormatString[] = {
#define MSG_DEF(_name, _argc, _exn, _str) \
{ _str, _argc, _exn },
#include "mozilla/dom/Errors.msg"
#undef MSG_DEF
};
#define MSG_DEF(_name, _argc, _exn, _str) \
static_assert(_argc < JS::MaxNumErrorArguments, \
#_name " must only have as many error arguments as the JS engine can support");
#include "mozilla/dom/Errors.msg"
#undef MSG_DEF
const JSErrorFormatString*
GetErrorMessage(void* aUserRef, const unsigned aErrorNumber)
{
MOZ_ASSERT(aErrorNumber < ArrayLength(ErrorFormatString));
return &ErrorFormatString[aErrorNumber];
}
uint16_t
GetErrorArgCount(const ErrNum aErrorNumber)
{
return GetErrorMessage(nullptr, aErrorNumber)->argCount;
}
bool
ThrowErrorMessage(JSContext* aCx, const ErrNum aErrorNumber, ...)
{
va_list ap;
va_start(ap, aErrorNumber);
JS_ReportErrorNumberVA(aCx, GetErrorMessage, nullptr,
static_cast<const unsigned>(aErrorNumber), ap);
va_end(ap);
return false;
}
bool
ThrowInvalidThis(JSContext* aCx, const JS::CallArgs& aArgs,
const ErrNum aErrorNumber,
const char* aInterfaceName)
{
NS_ConvertASCIItoUTF16 ifaceName(aInterfaceName);
// This should only be called for DOM methods/getters/setters, which
// are JSNative-backed functions, so we can assume that
// JS_ValueToFunction and JS_GetFunctionDisplayId will both return
// non-null and that JS_GetStringCharsZ returns non-null.
JS::Rooted<JSFunction*> func(aCx, JS_ValueToFunction(aCx, aArgs.calleev()));
MOZ_ASSERT(func);
JS::Rooted<JSString*> funcName(aCx, JS_GetFunctionDisplayId(func));
MOZ_ASSERT(funcName);
nsAutoJSString funcNameStr;
if (!funcNameStr.init(aCx, funcName)) {
return false;
}
MOZ_RELEASE_ASSERT(GetErrorArgCount(aErrorNumber) <= 2);
JS_ReportErrorNumberUC(aCx, GetErrorMessage, nullptr,
static_cast<const unsigned>(aErrorNumber),
funcNameStr.get(), ifaceName.get());
return false;
}
bool
ThrowInvalidThis(JSContext* aCx, const JS::CallArgs& aArgs,
const ErrNum aErrorNumber,
prototypes::ID aProtoId)
{
return ThrowInvalidThis(aCx, aArgs, aErrorNumber,
NamesOfInterfacesWithProtos(aProtoId));
}
bool
ThrowNoSetterArg(JSContext* aCx, prototypes::ID aProtoId)
{
nsPrintfCString errorMessage("%s attribute setter",
NamesOfInterfacesWithProtos(aProtoId));
return ThrowErrorMessage(aCx, MSG_MISSING_ARGUMENTS, errorMessage.get());
}
} // namespace dom
struct ErrorResult::Message {
Message() { MOZ_COUNT_CTOR(ErrorResult::Message); }
~Message() { MOZ_COUNT_DTOR(ErrorResult::Message); }
nsTArray<nsString> mArgs;
dom::ErrNum mErrorNumber;
bool HasCorrectNumberOfArguments()
{
return GetErrorArgCount(mErrorNumber) == mArgs.Length();
}
};
nsTArray<nsString>&
ErrorResult::CreateErrorMessageHelper(const dom::ErrNum errorNumber, nsresult errorType)
{
mResult = errorType;
mMessage = new Message();
mMessage->mErrorNumber = errorNumber;
return mMessage->mArgs;
}
void
ErrorResult::SerializeMessage(IPC::Message* aMsg) const
{
using namespace IPC;
MOZ_ASSERT(mUnionState == HasMessage);
MOZ_ASSERT(mMessage);
WriteParam(aMsg, mMessage->mArgs);
WriteParam(aMsg, mMessage->mErrorNumber);
}
bool
ErrorResult::DeserializeMessage(const IPC::Message* aMsg, void** aIter)
{
using namespace IPC;
nsAutoPtr<Message> readMessage(new Message());
if (!ReadParam(aMsg, aIter, &readMessage->mArgs) ||
!ReadParam(aMsg, aIter, &readMessage->mErrorNumber)) {
return false;
}
if (!readMessage->HasCorrectNumberOfArguments()) {
return false;
}
MOZ_ASSERT(mUnionState == HasNothing);
mMessage = readMessage.forget();
#ifdef DEBUG
mUnionState = HasMessage;
#endif // DEBUG
return true;
}
void
ErrorResult::SetPendingExceptionWithMessage(JSContext* aCx)
{
MOZ_ASSERT(mMessage, "SetPendingExceptionWithMessage() can be called only once");
MOZ_ASSERT(mUnionState == HasMessage);
Message* message = mMessage;
MOZ_RELEASE_ASSERT(message->HasCorrectNumberOfArguments());
const uint32_t argCount = message->mArgs.Length();
const char16_t* args[JS::MaxNumErrorArguments + 1];
for (uint32_t i = 0; i < argCount; ++i) {
args[i] = message->mArgs.ElementAt(i).get();
}
args[argCount] = nullptr;
JS_ReportErrorNumberUCArray(aCx, dom::GetErrorMessage, nullptr,
static_cast<const unsigned>(message->mErrorNumber),
argCount > 0 ? args : nullptr);
ClearMessage();
mResult = NS_OK;
}
void
ErrorResult::ClearMessage()
{
MOZ_ASSERT(IsErrorWithMessage());
delete mMessage;
mMessage = nullptr;
#ifdef DEBUG
mUnionState = HasNothing;
#endif // DEBUG
}
void
ErrorResult::ThrowJSException(JSContext* cx, JS::Handle<JS::Value> exn)
{
MOZ_ASSERT(mMightHaveUnreportedJSException,
"Why didn't you tell us you planned to throw a JS exception?");
ClearUnionData();
// Make sure mJSException is initialized _before_ we try to root it. But
// don't set it to exn yet, because we don't want to do that until after we
// root.
mJSException.setUndefined();
if (!js::AddRawValueRoot(cx, &mJSException, "ErrorResult::mJSException")) {
// Don't use NS_ERROR_DOM_JS_EXCEPTION, because that indicates we have
// in fact rooted mJSException.
mResult = NS_ERROR_OUT_OF_MEMORY;
} else {
mJSException = exn;
mResult = NS_ERROR_DOM_JS_EXCEPTION;
#ifdef DEBUG
mUnionState = HasJSException;
#endif // DEBUG
}
}
void
ErrorResult::SetPendingJSException(JSContext* cx)
{
MOZ_ASSERT(!mMightHaveUnreportedJSException,
"Why didn't you tell us you planned to handle JS exceptions?");
MOZ_ASSERT(mUnionState == HasJSException);
JS::Rooted<JS::Value> exception(cx, mJSException);
if (JS_WrapValue(cx, &exception)) {
JS_SetPendingException(cx, exception);
}
mJSException = exception;
// If JS_WrapValue failed, not much we can do about it... No matter
// what, go ahead and unroot mJSException.
js::RemoveRawValueRoot(cx, &mJSException);
mResult = NS_OK;
#ifdef DEBUG
mUnionState = HasNothing;
#endif // DEBUG
}
struct ErrorResult::DOMExceptionInfo {
DOMExceptionInfo(nsresult rv, const nsACString& message)
: mMessage(message)
, mRv(rv)
{}
nsCString mMessage;
nsresult mRv;
};
void
ErrorResult::SerializeDOMExceptionInfo(IPC::Message* aMsg) const
{
using namespace IPC;
MOZ_ASSERT(mDOMExceptionInfo);
MOZ_ASSERT(mUnionState == HasDOMExceptionInfo);
WriteParam(aMsg, mDOMExceptionInfo->mMessage);
WriteParam(aMsg, mDOMExceptionInfo->mRv);
}
bool
ErrorResult::DeserializeDOMExceptionInfo(const IPC::Message* aMsg, void** aIter)
{
using namespace IPC;
nsCString message;
nsresult rv;
if (!ReadParam(aMsg, aIter, &message) ||
!ReadParam(aMsg, aIter, &rv)) {
return false;
}
MOZ_ASSERT(mUnionState == HasNothing);
MOZ_ASSERT(IsDOMException());
mDOMExceptionInfo = new DOMExceptionInfo(rv, message);
#ifdef DEBUG
mUnionState = HasDOMExceptionInfo;
#endif // DEBUG
return true;
}
void
ErrorResult::ThrowDOMException(nsresult rv, const nsACString& message)
{
ClearUnionData();
mResult = NS_ERROR_DOM_DOMEXCEPTION;
mDOMExceptionInfo = new DOMExceptionInfo(rv, message);
#ifdef DEBUG
mUnionState = HasDOMExceptionInfo;
#endif
}
void
ErrorResult::SetPendingDOMException(JSContext* cx)
{
MOZ_ASSERT(mDOMExceptionInfo,
"SetPendingDOMException() can be called only once");
MOZ_ASSERT(mUnionState == HasDOMExceptionInfo);
dom::Throw(cx, mDOMExceptionInfo->mRv, mDOMExceptionInfo->mMessage);
ClearDOMExceptionInfo();
mResult = NS_OK;
}
void
ErrorResult::ClearDOMExceptionInfo()
{
MOZ_ASSERT(IsDOMException());
MOZ_ASSERT(mUnionState == HasDOMExceptionInfo || !mDOMExceptionInfo);
delete mDOMExceptionInfo;
mDOMExceptionInfo = nullptr;
#ifdef DEBUG
mUnionState = HasNothing;
#endif // DEBUG
}
void
ErrorResult::ClearUnionData()
{
if (IsJSException()) {
JSContext* cx = nsContentUtils::GetDefaultJSContextForThread();
MOZ_ASSERT(cx);
mJSException.setUndefined();
js::RemoveRawValueRoot(cx, &mJSException);
#ifdef DEBUG
mUnionState = HasNothing;
#endif // DEBUG
} else if (IsErrorWithMessage()) {
ClearMessage();
} else if (IsDOMException()) {
ClearDOMExceptionInfo();
}
}
void
ErrorResult::SetPendingGenericErrorException(JSContext* cx)
{
MOZ_ASSERT(!IsErrorWithMessage());
MOZ_ASSERT(!IsJSException());
MOZ_ASSERT(!IsDOMException());
dom::Throw(cx, ErrorCode());
mResult = NS_OK;
}
ErrorResult&
ErrorResult::operator=(ErrorResult&& aRHS)
{
// Clear out any union members we may have right now, before we
// start writing to it.
ClearUnionData();
#ifdef DEBUG
mMightHaveUnreportedJSException = aRHS.mMightHaveUnreportedJSException;
aRHS.mMightHaveUnreportedJSException = false;
#endif
if (aRHS.IsErrorWithMessage()) {
mMessage = aRHS.mMessage;
aRHS.mMessage = nullptr;
} else if (aRHS.IsJSException()) {
JSContext* cx = nsContentUtils::GetDefaultJSContextForThread();
MOZ_ASSERT(cx);
mJSException.setUndefined();
if (!js::AddRawValueRoot(cx, &mJSException, "ErrorResult::mJSException")) {
MOZ_CRASH("Could not root mJSException, we're about to OOM");
}
mJSException = aRHS.mJSException;
aRHS.mJSException.setUndefined();
js::RemoveRawValueRoot(cx, &aRHS.mJSException);
} else if (aRHS.IsDOMException()) {
mDOMExceptionInfo = aRHS.mDOMExceptionInfo;
aRHS.mDOMExceptionInfo = nullptr;
} else {
// Null out the union on both sides for hygiene purposes.
mMessage = aRHS.mMessage = nullptr;
}
#ifdef DEBUG
mUnionState = aRHS.mUnionState;
aRHS.mUnionState = HasNothing;
#endif // DEBUG
// Note: It's important to do this last, since this affects the condition
// checks above!
mResult = aRHS.mResult;
aRHS.mResult = NS_OK;
return *this;
}
void
ErrorResult::CloneTo(ErrorResult& aRv) const
{
aRv.ClearUnionData();
aRv.mResult = mResult;
#ifdef DEBUG
aRv.mMightHaveUnreportedJSException = mMightHaveUnreportedJSException;
#endif
if (IsErrorWithMessage()) {
#ifdef DEBUG
aRv.mUnionState = HasMessage;
#endif
aRv.mMessage = new Message();
aRv.mMessage->mArgs = mMessage->mArgs;
aRv.mMessage->mErrorNumber = mMessage->mErrorNumber;
} else if (IsDOMException()) {
#ifdef DEBUG
aRv.mUnionState = HasDOMExceptionInfo;
#endif
aRv.mDOMExceptionInfo = new DOMExceptionInfo(mDOMExceptionInfo->mRv,
mDOMExceptionInfo->mMessage);
} else if (IsJSException()) {
#ifdef DEBUG
aRv.mUnionState = HasJSException;
#endif
JSContext* cx = nsContentUtils::RootingCxForThread();
JS::Rooted<JS::Value> exception(cx, mJSException);
aRv.ThrowJSException(cx, exception);
}
}
void
ErrorResult::SuppressException()
{
WouldReportJSException();
ClearUnionData();
// We don't use AssignErrorCode, because we want to override existing error
// states, which AssignErrorCode is not allowed to do.
mResult = NS_OK;
}
void
ErrorResult::SetPendingException(JSContext* cx)
{
if (IsUncatchableException()) {
// Nuke any existing exception on cx, to make sure we're uncatchable.
JS_ClearPendingException(cx);
// Don't do any reporting. Just return, to create an
// uncatchable exception.
mResult = NS_OK;
return;
}
if (IsJSContextException()) {
// Whatever we need to throw is on the JSContext already. We
// can't assert that there is a pending exception on it, though,
// because in the uncatchable exception case there won't be one.
mResult = NS_OK;
return;
}
if (IsErrorWithMessage()) {
SetPendingExceptionWithMessage(cx);
return;
}
if (IsJSException()) {
SetPendingJSException(cx);
return;
}
if (IsDOMException()) {
SetPendingDOMException(cx);
return;
}
SetPendingGenericErrorException(cx);
}
namespace dom {
bool
DefineConstants(JSContext* cx, JS::Handle<JSObject*> obj,
const ConstantSpec* cs)
{
JS::Rooted<JS::Value> value(cx);
for (; cs->name; ++cs) {
value = cs->value;
bool ok =
JS_DefineProperty(cx, obj, cs->name, value,
JSPROP_ENUMERATE | JSPROP_READONLY | JSPROP_PERMANENT);
if (!ok) {
return false;
}
}
return true;
}
static inline bool
Define(JSContext* cx, JS::Handle<JSObject*> obj, const JSFunctionSpec* spec) {
return JS_DefineFunctions(cx, obj, spec);
}
static inline bool
Define(JSContext* cx, JS::Handle<JSObject*> obj, const JSPropertySpec* spec) {
return JS_DefineProperties(cx, obj, spec);
}
static inline bool
Define(JSContext* cx, JS::Handle<JSObject*> obj, const ConstantSpec* spec) {
return DefineConstants(cx, obj, spec);
}
template<typename T>
bool
DefinePrefable(JSContext* cx, JS::Handle<JSObject*> obj,
const Prefable<T>* props)
{
MOZ_ASSERT(props);
MOZ_ASSERT(props->specs);
do {
// Define if enabled
if (props->isEnabled(cx, obj)) {
if (!Define(cx, obj, props->specs)) {
return false;
}
}
} while ((++props)->specs);
return true;
}
bool
DefineUnforgeableMethods(JSContext* cx, JS::Handle<JSObject*> obj,
const Prefable<const JSFunctionSpec>* props)
{
return DefinePrefable(cx, obj, props);
}
bool
DefineUnforgeableAttributes(JSContext* cx, JS::Handle<JSObject*> obj,
const Prefable<const JSPropertySpec>* props)
{
return DefinePrefable(cx, obj, props);
}
// We should use JSFunction objects for interface objects, but we need a custom
// hasInstance hook because we have new interface objects on prototype chains of
// old (XPConnect-based) bindings. We also need Xrays and arbitrary numbers of
// reserved slots (e.g. for named constructors). So we define a custom
// funToString ObjectOps member for interface objects.
JSString*
InterfaceObjectToString(JSContext* aCx, JS::Handle<JSObject*> aObject,
unsigned /* indent */)
{
const js::Class* clasp = js::GetObjectClass(aObject);
MOZ_ASSERT(IsDOMIfaceAndProtoClass(clasp));
const DOMIfaceAndProtoJSClass* ifaceAndProtoJSClass =
DOMIfaceAndProtoJSClass::FromJSClass(clasp);
return JS_NewStringCopyZ(aCx, ifaceAndProtoJSClass->mToString);
}
bool
Constructor(JSContext* cx, unsigned argc, JS::Value* vp)
{
JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
const JS::Value& v =
js::GetFunctionNativeReserved(&args.callee(),
CONSTRUCTOR_NATIVE_HOLDER_RESERVED_SLOT);
const JSNativeHolder* nativeHolder =
static_cast<const JSNativeHolder*>(v.toPrivate());
return (nativeHolder->mNative)(cx, argc, vp);
}
static JSObject*
CreateConstructor(JSContext* cx, JS::Handle<JSObject*> global, const char* name,
const JSNativeHolder* nativeHolder, unsigned ctorNargs)
{
JSFunction* fun = js::NewFunctionWithReserved(cx, Constructor, ctorNargs,
JSFUN_CONSTRUCTOR, name);
if (!fun) {
return nullptr;
}
JSObject* constructor = JS_GetFunctionObject(fun);
js::SetFunctionNativeReserved(constructor,
CONSTRUCTOR_NATIVE_HOLDER_RESERVED_SLOT,
js::PrivateValue(const_cast<JSNativeHolder*>(nativeHolder)));
return constructor;
}
static bool
DefineConstructor(JSContext* cx, JS::Handle<JSObject*> global, const char* name,
JS::Handle<JSObject*> constructor)
{
bool alreadyDefined;
if (!JS_AlreadyHasOwnProperty(cx, global, name, &alreadyDefined)) {
return false;
}
// This is Enumerable: False per spec.
return alreadyDefined ||
JS_DefineProperty(cx, global, name, constructor, JSPROP_RESOLVING);
}
static JSObject*
CreateInterfaceObject(JSContext* cx, JS::Handle<JSObject*> global,
JS::Handle<JSObject*> constructorProto,
const js::Class* constructorClass,
const JSNativeHolder* constructorNative,
unsigned ctorNargs, const NamedConstructor* namedConstructors,
JS::Handle<JSObject*> proto,
const NativeProperties* properties,
const NativeProperties* chromeOnlyProperties,
const char* name, bool defineOnGlobal)
{
JS::Rooted<JSObject*> constructor(cx);
if (constructorClass) {
MOZ_ASSERT(constructorProto);
constructor = JS_NewObjectWithGivenProto(cx, Jsvalify(constructorClass),
constructorProto);
} else {
MOZ_ASSERT(constructorNative);
MOZ_ASSERT(constructorProto == JS_GetFunctionPrototype(cx, global));
constructor = CreateConstructor(cx, global, name, constructorNative,
ctorNargs);
}
if (!constructor) {
return nullptr;
}
if (constructorClass) {
if (!JS_DefineProperty(cx, constructor, "length", ctorNargs,
JSPROP_READONLY)) {
return nullptr;
}
// Might as well intern, since we're going to need an atomized
// version of name anyway when we stick our constructor on the
// global.
JS::Rooted<JSString*> nameStr(cx, JS_AtomizeAndPinString(cx, name));
if (!nameStr) {
return nullptr;
}
if (!JS_DefineProperty(cx, constructor, "name", nameStr, JSPROP_READONLY)) {
return nullptr;
}
}
if (properties) {
if (properties->staticMethods &&
!DefinePrefable(cx, constructor, properties->staticMethods)) {
return nullptr;
}
if (properties->staticAttributes &&
!DefinePrefable(cx, constructor, properties->staticAttributes)) {
return nullptr;
}
if (properties->constants &&
!DefinePrefable(cx, constructor, properties->constants)) {
return nullptr;
}
}
if (chromeOnlyProperties) {
if (chromeOnlyProperties->staticMethods &&
!DefinePrefable(cx, constructor, chromeOnlyProperties->staticMethods)) {
return nullptr;
}
if (chromeOnlyProperties->staticAttributes &&
!DefinePrefable(cx, constructor,
chromeOnlyProperties->staticAttributes)) {
return nullptr;
}
if (chromeOnlyProperties->constants &&
!DefinePrefable(cx, constructor, chromeOnlyProperties->constants)) {
return nullptr;
}
}
if (proto && !JS_LinkConstructorAndPrototype(cx, constructor, proto)) {
return nullptr;
}
if (defineOnGlobal && !DefineConstructor(cx, global, name, constructor)) {
return nullptr;
}
if (namedConstructors) {
int namedConstructorSlot = DOM_INTERFACE_SLOTS_BASE;
while (namedConstructors->mName) {
JS::Rooted<JSObject*> namedConstructor(cx,
CreateConstructor(cx, global, namedConstructors->mName,
&namedConstructors->mHolder,
namedConstructors->mNargs));
if (!namedConstructor ||
!JS_DefineProperty(cx, namedConstructor, "prototype",
proto,
JSPROP_PERMANENT | JSPROP_READONLY,
JS_STUBGETTER, JS_STUBSETTER) ||
(defineOnGlobal &&
!DefineConstructor(cx, global, namedConstructors->mName,
namedConstructor))) {
return nullptr;
}
js::SetReservedSlot(constructor, namedConstructorSlot++,
JS::ObjectValue(*namedConstructor));
++namedConstructors;
}
}
return constructor;
}
bool
DefineWebIDLBindingUnforgeablePropertiesOnXPCObject(JSContext* cx,
JS::Handle<JSObject*> obj,
const NativeProperties* properties)
{
if (properties->unforgeableAttributes &&
!DefinePrefable(cx, obj, properties->unforgeableAttributes)) {
return false;
}
return true;
}
bool
DefineWebIDLBindingPropertiesOnXPCObject(JSContext* cx,
JS::Handle<JSObject*> obj,
const NativeProperties* properties)
{
if (properties->methods &&
!DefinePrefable(cx, obj, properties->methods)) {
return false;
}
if (properties->attributes &&
!DefinePrefable(cx, obj, properties->attributes)) {
return false;
}
return true;
}
static JSObject*
CreateInterfacePrototypeObject(JSContext* cx, JS::Handle<JSObject*> global,
JS::Handle<JSObject*> parentProto,
const js::Class* protoClass,
const NativeProperties* properties,
const NativeProperties* chromeOnlyProperties,
const char* const* unscopableNames)
{
JS::Rooted<JSObject*> ourProto(cx,
JS_NewObjectWithUniqueType(cx, Jsvalify(protoClass), parentProto));
if (!ourProto ||
!DefineProperties(cx, ourProto, properties, chromeOnlyProperties)) {
return nullptr;
}
if (unscopableNames) {
JS::Rooted<JSObject*> unscopableObj(cx, JS_NewPlainObject(cx));
if (!unscopableObj) {
return nullptr;
}
for (; *unscopableNames; ++unscopableNames) {
if (!JS_DefineProperty(cx, unscopableObj, *unscopableNames,
JS::TrueHandleValue, JSPROP_ENUMERATE)) {
return nullptr;
}
}
JS::Rooted<jsid> unscopableId(cx,
SYMBOL_TO_JSID(JS::GetWellKnownSymbol(cx, JS::SymbolCode::unscopables)));
// Readonly and non-enumerable to match Array.prototype.
if (!JS_DefinePropertyById(cx, ourProto, unscopableId, unscopableObj,
JSPROP_READONLY)) {
return nullptr;
}
}
return ourProto;
}
bool
DefineProperties(JSContext* cx, JS::Handle<JSObject*> obj,
const NativeProperties* properties,
const NativeProperties* chromeOnlyProperties)
{
if (properties) {
if (properties->methods &&
!DefinePrefable(cx, obj, properties->methods)) {
return false;
}
if (properties->attributes &&
!DefinePrefable(cx, obj, properties->attributes)) {
return false;
}
if (properties->constants &&
!DefinePrefable(cx, obj, properties->constants)) {
return false;
}
}
if (chromeOnlyProperties) {
if (chromeOnlyProperties->methods &&
!DefinePrefable(cx, obj, chromeOnlyProperties->methods)) {
return false;
}
if (chromeOnlyProperties->attributes &&
!DefinePrefable(cx, obj, chromeOnlyProperties->attributes)) {
return false;
}
if (chromeOnlyProperties->constants &&
!DefinePrefable(cx, obj, chromeOnlyProperties->constants)) {
return false;
}
}
return true;
}
void
CreateInterfaceObjects(JSContext* cx, JS::Handle<JSObject*> global,
JS::Handle<JSObject*> protoProto,
const js::Class* protoClass, JS::Heap<JSObject*>* protoCache,
JS::Handle<JSObject*> constructorProto,
const js::Class* constructorClass, const JSNativeHolder* constructor,
unsigned ctorNargs, const NamedConstructor* namedConstructors,
JS::Heap<JSObject*>* constructorCache,
const NativeProperties* properties,
const NativeProperties* chromeOnlyProperties,
const char* name, bool defineOnGlobal,
const char* const* unscopableNames)
{
MOZ_ASSERT(protoClass || constructorClass || constructor,
"Need at least one class or a constructor!");
MOZ_ASSERT(!((properties &&
(properties->methods || properties->attributes)) ||
(chromeOnlyProperties &&
(chromeOnlyProperties->methods ||
chromeOnlyProperties->attributes))) || protoClass,
"Methods or properties but no protoClass!");
MOZ_ASSERT(!((properties &&
(properties->staticMethods || properties->staticAttributes)) ||
(chromeOnlyProperties &&
(chromeOnlyProperties->staticMethods ||
chromeOnlyProperties->staticAttributes))) ||
constructorClass || constructor,
"Static methods but no constructorClass or constructor!");
MOZ_ASSERT(bool(name) == bool(constructorClass || constructor),
"Must have name precisely when we have an interface object");
MOZ_ASSERT(!constructorClass || !constructor);
MOZ_ASSERT(!protoClass == !protoCache,
"If, and only if, there is an interface prototype object we need "
"to cache it");
MOZ_ASSERT(!(constructorClass || constructor) == !constructorCache,
"If, and only if, there is an interface object we need to cache "
"it");
JS::Rooted<JSObject*> proto(cx);
if (protoClass) {
proto =
CreateInterfacePrototypeObject(cx, global, protoProto, protoClass,
properties, chromeOnlyProperties,
unscopableNames);
if (!proto) {
return;
}
*protoCache = proto;
}
else {
MOZ_ASSERT(!proto);
}
JSObject* interface;
if (constructorClass || constructor) {
interface = CreateInterfaceObject(cx, global, constructorProto,
constructorClass, constructor,
ctorNargs, namedConstructors, proto,
properties, chromeOnlyProperties, name,
defineOnGlobal);
if (!interface) {
if (protoCache) {
// If we fail we need to make sure to clear the value of protoCache we
// set above.
*protoCache = nullptr;
}
return;
}
*constructorCache = interface;
}
}
bool
NativeInterface2JSObjectAndThrowIfFailed(JSContext* aCx,
JS::Handle<JSObject*> aScope,
JS::MutableHandle<JS::Value> aRetval,
xpcObjectHelper& aHelper,
const nsIID* aIID,
bool aAllowNativeWrapper)
{
js::AssertSameCompartment(aCx, aScope);
nsresult rv;
// Inline some logic from XPCConvert::NativeInterfaceToJSObject that we need
// on all threads.
nsWrapperCache *cache = aHelper.GetWrapperCache();
if (cache && cache->IsDOMBinding()) {
JS::Rooted<JSObject*> obj(aCx, cache->GetWrapper());
if (!obj) {
obj = cache->WrapObject(aCx, nullptr);
}
if (obj && aAllowNativeWrapper && !JS_WrapObject(aCx, &obj)) {
return false;
}
if (obj) {
aRetval.setObject(*obj);
return true;
}
}
MOZ_ASSERT(NS_IsMainThread());
if (!XPCConvert::NativeInterface2JSObject(aRetval, nullptr, aHelper, aIID,
nullptr, aAllowNativeWrapper, &rv)) {
// I can't tell if NativeInterface2JSObject throws JS exceptions
// or not. This is a sloppy stab at the right semantics; the
// method really ought to be fixed to behave consistently.
if (!JS_IsExceptionPending(aCx)) {
Throw(aCx, NS_FAILED(rv) ? rv : NS_ERROR_UNEXPECTED);
}
return false;
}
return true;
}
bool
TryPreserveWrapper(JSObject* obj)
{
MOZ_ASSERT(IsDOMObject(obj));
if (nsISupports* native = UnwrapDOMObjectToISupports(obj)) {
nsWrapperCache* cache = nullptr;
CallQueryInterface(native, &cache);
if (cache) {
cache->PreserveWrapper(native);
}
return true;
}
// If this DOMClass is not cycle collected, then it isn't wrappercached,
// so it does not need to be preserved. If it is cycle collected, then
// we can't tell if it is wrappercached or not, so we just return false.
const DOMJSClass* domClass = GetDOMClass(obj);
return domClass && !domClass->mParticipant;
}
// Can only be called with a DOM JSClass.
bool
InstanceClassHasProtoAtDepth(const js::Class* clasp,
uint32_t protoID, uint32_t depth)
{
const DOMJSClass* domClass = DOMJSClass::FromJSClass(clasp);
return static_cast<uint32_t>(domClass->mInterfaceChain[depth]) == protoID;
}
// Only set allowNativeWrapper to false if you really know you need it, if in
// doubt use true. Setting it to false disables security wrappers.
bool
XPCOMObjectToJsval(JSContext* cx, JS::Handle<JSObject*> scope,
xpcObjectHelper& helper, const nsIID* iid,
bool allowNativeWrapper, JS::MutableHandle<JS::Value> rval)
{
if (!NativeInterface2JSObjectAndThrowIfFailed(cx, scope, rval, helper, iid,
allowNativeWrapper)) {
return false;
}
#ifdef DEBUG
JSObject* jsobj = rval.toObjectOrNull();
if (jsobj &&
js::GetGlobalForObjectCrossCompartment(jsobj) == jsobj) {
NS_ASSERTION(js::GetObjectClass(jsobj)->flags & JSCLASS_IS_GLOBAL,
"Why did we recreate this wrapper?");
}
#endif
return true;
}
bool
VariantToJsval(JSContext* aCx, nsIVariant* aVariant,
JS::MutableHandle<JS::Value> aRetval)
{
nsresult rv;
if (!XPCVariant::VariantDataToJS(aVariant, &rv, aRetval)) {
// Does it throw? Who knows
if (!JS_IsExceptionPending(aCx)) {
Throw(aCx, NS_FAILED(rv) ? rv : NS_ERROR_UNEXPECTED);
}
return false;
}
return true;
}
bool
QueryInterface(JSContext* cx, unsigned argc, JS::Value* vp)
{
JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
JS::Rooted<JS::Value> thisv(cx, JS_THIS(cx, vp));
if (thisv.isNull())
return false;
// Get the object. It might be a security wrapper, in which case we do a checked
// unwrap.
JS::Rooted<JSObject*> origObj(cx, &thisv.toObject());
JS::Rooted<JSObject*> obj(cx, js::CheckedUnwrap(origObj,
/* stopAtWindowProxy = */ false));
if (!obj) {
JS_ReportError(cx, "Permission denied to access object");
return false;
}
// Switch this to UnwrapDOMObjectToISupports once our global objects are
// using new bindings.
nsCOMPtr<nsISupports> native;
UnwrapArg<nsISupports>(obj, getter_AddRefs(native));
if (!native) {
return Throw(cx, NS_ERROR_FAILURE);
}
if (argc < 1) {
return Throw(cx, NS_ERROR_XPC_NOT_ENOUGH_ARGS);
}
if (!args[0].isObject()) {
return Throw(cx, NS_ERROR_XPC_BAD_CONVERT_JS);
}
nsCOMPtr<nsIJSID> iid;
obj = &args[0].toObject();
if (NS_FAILED(UnwrapArg<nsIJSID>(obj, getter_AddRefs(iid)))) {
return Throw(cx, NS_ERROR_XPC_BAD_CONVERT_JS);
}
MOZ_ASSERT(iid);
if (iid->GetID()->Equals(NS_GET_IID(nsIClassInfo))) {
nsresult rv;
nsCOMPtr<nsIClassInfo> ci = do_QueryInterface(native, &rv);
if (NS_FAILED(rv)) {
return Throw(cx, rv);
}
return WrapObject(cx, ci, &NS_GET_IID(nsIClassInfo), args.rval());
}
nsCOMPtr<nsISupports> unused;
nsresult rv = native->QueryInterface(*iid->GetID(), getter_AddRefs(unused));
if (NS_FAILED(rv)) {
return Throw(cx, rv);
}
*vp = thisv;
return true;
}
void
GetInterfaceImpl(JSContext* aCx, nsIInterfaceRequestor* aRequestor,
nsWrapperCache* aCache, nsIJSID* aIID,
JS::MutableHandle<JS::Value> aRetval, ErrorResult& aError)
{
const nsID* iid = aIID->GetID();
RefPtr<nsISupports> result;
aError = aRequestor->GetInterface(*iid, getter_AddRefs(result));
if (aError.Failed()) {
return;
}
if (!WrapObject(aCx, result, iid, aRetval)) {
aError.Throw(NS_ERROR_FAILURE);
}
}
bool
UnforgeableValueOf(JSContext* cx, unsigned argc, JS::Value* vp)
{
JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
args.rval().set(args.thisv());
return true;
}
bool
ThrowingConstructor(JSContext* cx, unsigned argc, JS::Value* vp)
{
return ThrowErrorMessage(cx, MSG_ILLEGAL_CONSTRUCTOR);
}
bool
ThrowConstructorWithoutNew(JSContext* cx, const char* name)
{
return ThrowErrorMessage(cx, MSG_CONSTRUCTOR_WITHOUT_NEW, name);
}
inline const NativePropertyHooks*
GetNativePropertyHooksFromConstructorFunction(JS::Handle<JSObject*> obj)
{
MOZ_ASSERT(JS_IsNativeFunction(obj, Constructor));
const JS::Value& v =
js::GetFunctionNativeReserved(obj,
CONSTRUCTOR_NATIVE_HOLDER_RESERVED_SLOT);
const JSNativeHolder* nativeHolder =
static_cast<const JSNativeHolder*>(v.toPrivate());
return nativeHolder->mPropertyHooks;
}
inline const NativePropertyHooks*
GetNativePropertyHooks(JSContext *cx, JS::Handle<JSObject*> obj,
DOMObjectType& type)
{
const js::Class* clasp = js::GetObjectClass(obj);
const DOMJSClass* domClass = GetDOMClass(clasp);
if (domClass) {
bool isGlobal = (clasp->flags & JSCLASS_DOM_GLOBAL) != 0;
type = isGlobal ? eGlobalInstance : eInstance;
return domClass->mNativeHooks;
}
if (JS_ObjectIsFunction(cx, obj)) {
type = eInterface;
return GetNativePropertyHooksFromConstructorFunction(obj);
}
MOZ_ASSERT(IsDOMIfaceAndProtoClass(js::GetObjectClass(obj)));
const DOMIfaceAndProtoJSClass* ifaceAndProtoJSClass =
DOMIfaceAndProtoJSClass::FromJSClass(js::GetObjectClass(obj));
type = ifaceAndProtoJSClass->mType;
return ifaceAndProtoJSClass->mNativeHooks;
}
static JSObject*
XrayCreateFunction(JSContext* cx, JS::Handle<JSObject*> wrapper,
JSNativeWrapper native, unsigned nargs, JS::Handle<jsid> id)
{
JSFunction* fun = js::NewFunctionByIdWithReserved(cx, native.op, nargs, 0, id);
if (!fun) {
return nullptr;
}
SET_JITINFO(fun, native.info);
JSObject* obj = JS_GetFunctionObject(fun);
js::SetFunctionNativeReserved(obj, XRAY_DOM_FUNCTION_PARENT_WRAPPER_SLOT,
JS::ObjectValue(*wrapper));
#ifdef DEBUG
js::SetFunctionNativeReserved(obj, XRAY_DOM_FUNCTION_NATIVE_SLOT_FOR_SELF,
JS::ObjectValue(*obj));
#endif
return obj;
}
static bool
XrayResolveAttribute(JSContext* cx, JS::Handle<JSObject*> wrapper,
JS::Handle<JSObject*> obj, JS::Handle<jsid> id,
const Prefable<const JSPropertySpec>* attributes, jsid* attributeIds,
const JSPropertySpec* attributeSpecs, JS::MutableHandle<JSPropertyDescriptor> desc,
bool& cacheOnHolder)
{
for (; attributes->specs; ++attributes) {
if (attributes->isEnabled(cx, obj)) {
// Set i to be the index into our full list of ids/specs that we're
// looking at now.
size_t i = attributes->specs - attributeSpecs;
for ( ; attributeIds[i] != JSID_VOID; ++i) {
if (id == attributeIds[i]) {
cacheOnHolder = true;
const JSPropertySpec& attrSpec = attributeSpecs[i];
// Because of centralization, we need to make sure we fault in the
// JitInfos as well. At present, until the JSAPI changes, the easiest
// way to do this is wrap them up as functions ourselves.
desc.setAttributes(attrSpec.flags);
// They all have getters, so we can just make it.
JS::Rooted<JSObject*> funobj(cx,
XrayCreateFunction(cx, wrapper, attrSpec.getter.native, 0, id));
if (!funobj)
return false;
desc.setGetterObject(funobj);
desc.attributesRef() |= JSPROP_GETTER;
if (attrSpec.setter.native.op) {
// We have a setter! Make it.
funobj =
XrayCreateFunction(cx, wrapper, attrSpec.setter.native, 1, id);
if (!funobj)
return false;
desc.setSetterObject(funobj);
desc.attributesRef() |= JSPROP_SETTER;
} else {
desc.setSetter(nullptr);
}
desc.object().set(wrapper);
return true;
}
}
}
}
return true;
}
static bool
XrayResolveMethod(JSContext* cx, JS::Handle<JSObject*> wrapper,
JS::Handle<JSObject*> obj, JS::Handle<jsid> id,
const Prefable<const JSFunctionSpec>* methods,
jsid* methodIds,
const JSFunctionSpec* methodSpecs,
JS::MutableHandle<JSPropertyDescriptor> desc,
bool& cacheOnHolder)
{
const Prefable<const JSFunctionSpec>* method;
for (method = methods; method->specs; ++method) {
if (method->isEnabled(cx, obj)) {
// Set i to be the index into our full list of ids/specs that we're
// looking at now.
size_t i = method->specs - methodSpecs;
for ( ; methodIds[i] != JSID_VOID; ++i) {
if (id == methodIds[i]) {
cacheOnHolder = true;
const JSFunctionSpec& methodSpec = methodSpecs[i];
JSObject *funobj;
if (methodSpec.selfHostedName) {
JSFunction* fun =
JS::GetSelfHostedFunction(cx, methodSpec.selfHostedName, id,
methodSpec.nargs);
if (!fun) {
return false;
}
MOZ_ASSERT(!methodSpec.call.op, "Bad FunctionSpec declaration: non-null native");
MOZ_ASSERT(!methodSpec.call.info, "Bad FunctionSpec declaration: non-null jitinfo");
funobj = JS_GetFunctionObject(fun);
} else {
funobj = XrayCreateFunction(cx, wrapper, methodSpec.call,
methodSpec.nargs, id);
if (!funobj) {
return false;
}
}
desc.value().setObject(*funobj);
desc.setAttributes(methodSpec.flags);
desc.object().set(wrapper);
desc.setSetter(nullptr);
desc.setGetter(nullptr);
return true;
}
}
}
}
return true;
}
// Try to resolve a property as an unforgeable property from the given
// NativeProperties, if it's there. nativeProperties is allowed to be null (in
// which case we of course won't resolve anything).
static bool
XrayResolveUnforgeableProperty(JSContext* cx, JS::Handle<JSObject*> wrapper,
JS::Handle<JSObject*> obj, JS::Handle<jsid> id,
JS::MutableHandle<JSPropertyDescriptor> desc,
bool& cacheOnHolder,
const NativeProperties* nativeProperties)
{
if (!nativeProperties) {
return true;
}
if (nativeProperties->unforgeableAttributes) {
if (!XrayResolveAttribute(cx, wrapper, obj, id,
nativeProperties->unforgeableAttributes,
nativeProperties->unforgeableAttributeIds,
nativeProperties->unforgeableAttributeSpecs,
desc, cacheOnHolder)) {
return false;
}
if (desc.object()) {
return true;
}
}
if (nativeProperties->unforgeableMethods) {
if (!XrayResolveMethod(cx, wrapper, obj, id,
nativeProperties->unforgeableMethods,
nativeProperties->unforgeableMethodIds,
nativeProperties->unforgeableMethodSpecs,
desc, cacheOnHolder)) {
return false;
}
if (desc.object()) {
return true;
}
}
return true;
}
static bool
XrayResolveProperty(JSContext* cx, JS::Handle<JSObject*> wrapper,
JS::Handle<JSObject*> obj, JS::Handle<jsid> id,
JS::MutableHandle<JSPropertyDescriptor> desc,
bool& cacheOnHolder, DOMObjectType type,
const NativeProperties* nativeProperties)
{
const Prefable<const JSFunctionSpec>* methods;
jsid* methodIds;
const JSFunctionSpec* methodSpecs;
if (type == eInterface) {
methods = nativeProperties->staticMethods;
methodIds = nativeProperties->staticMethodIds;
methodSpecs = nativeProperties->staticMethodSpecs;
} else {
methods = nativeProperties->methods;
methodIds = nativeProperties->methodIds;
methodSpecs = nativeProperties->methodSpecs;
}
if (methods) {
JS::Rooted<jsid> methodId(cx);
if (nativeProperties->iteratorAliasMethodIndex != -1 &&
id == SYMBOL_TO_JSID(
JS::GetWellKnownSymbol(cx, JS::SymbolCode::iterator))) {
methodId =
nativeProperties->methodIds[nativeProperties->iteratorAliasMethodIndex];
} else {
methodId = id;
}
if (!XrayResolveMethod(cx, wrapper, obj, methodId, methods, methodIds,
methodSpecs, desc, cacheOnHolder)) {
return false;
}
if (desc.object()) {
return true;
}
}
if (type == eInterface) {
if (nativeProperties->staticAttributes) {
if (!XrayResolveAttribute(cx, wrapper, obj, id,
nativeProperties->staticAttributes,
nativeProperties->staticAttributeIds,
nativeProperties->staticAttributeSpecs, desc,
cacheOnHolder)) {
return false;
}
if (desc.object()) {
return true;
}
}
} else {
if (nativeProperties->attributes) {
if (!XrayResolveAttribute(cx, wrapper, obj, id,
nativeProperties->attributes,
nativeProperties->attributeIds,
nativeProperties->attributeSpecs, desc,
cacheOnHolder)) {
return false;
}
if (desc.object()) {
return true;
}
}
}
if (nativeProperties->constants) {
const Prefable<const ConstantSpec>* constant;
for (constant = nativeProperties->constants; constant->specs; ++constant) {
if (constant->isEnabled(cx, obj)) {
// Set i to be the index into our full list of ids/specs that we're
// looking at now.
size_t i = constant->specs - nativeProperties->constantSpecs;
for ( ; nativeProperties->constantIds[i] != JSID_VOID; ++i) {
if (id == nativeProperties->constantIds[i]) {
cacheOnHolder = true;
desc.setAttributes(JSPROP_ENUMERATE | JSPROP_READONLY | JSPROP_PERMANENT);
desc.object().set(wrapper);
desc.value().set(nativeProperties->constantSpecs[i].value);
return true;
}
}
}
}
}
return true;
}
static bool
ResolvePrototypeOrConstructor(JSContext* cx, JS::Handle<JSObject*> wrapper,
JS::Handle<JSObject*> obj,
size_t protoAndIfaceCacheIndex, unsigned attrs,
JS::MutableHandle<JSPropertyDescriptor> desc,
bool& cacheOnHolder)
{
JS::Rooted<JSObject*> global(cx, js::GetGlobalForObjectCrossCompartment(obj));
{
JSAutoCompartment ac(cx, global);
ProtoAndIfaceCache& protoAndIfaceCache = *GetProtoAndIfaceCache(global);
JSObject* protoOrIface =
protoAndIfaceCache.EntrySlotIfExists(protoAndIfaceCacheIndex);
if (!protoOrIface) {
return false;
}
cacheOnHolder = true;
desc.object().set(wrapper);
desc.setAttributes(attrs);
desc.setGetter(nullptr);
desc.setSetter(nullptr);
desc.value().set(JS::ObjectValue(*protoOrIface));
}
return JS_WrapPropertyDescriptor(cx, desc);
}
#ifdef DEBUG
static void
DEBUG_CheckXBLCallable(JSContext *cx, JSObject *obj)
{
// In general, we shouldn't have cross-compartment wrappers here, because
// we should be running in an XBL scope, and the content prototype should
// contain wrappers to functions defined in the XBL scope. But if the node
// has been adopted into another compartment, those prototypes will now point
// to a different XBL scope (which is ok).
MOZ_ASSERT_IF(js::IsCrossCompartmentWrapper(obj),
xpc::IsContentXBLScope(js::GetObjectCompartment(js::UncheckedUnwrap(obj))));
MOZ_ASSERT(JS::IsCallable(obj));
}
static void
DEBUG_CheckXBLLookup(JSContext *cx, JSPropertyDescriptor *desc)
{
if (!desc->obj)
return;
if (!desc->value.isUndefined()) {
MOZ_ASSERT(desc->value.isObject());
DEBUG_CheckXBLCallable(cx, &desc->value.toObject());
}
if (desc->getter) {
MOZ_ASSERT(desc->attrs & JSPROP_GETTER);
DEBUG_CheckXBLCallable(cx, JS_FUNC_TO_DATA_PTR(JSObject *, desc->getter));
}
if (desc->setter) {
MOZ_ASSERT(desc->attrs & JSPROP_SETTER);
DEBUG_CheckXBLCallable(cx, JS_FUNC_TO_DATA_PTR(JSObject *, desc->setter));
}
}
#else
#define DEBUG_CheckXBLLookup(a, b) {}
#endif
/* static */ bool
XrayResolveOwnProperty(JSContext* cx, JS::Handle<JSObject*> wrapper,
JS::Handle<JSObject*> obj, JS::Handle<jsid> id,
JS::MutableHandle<JSPropertyDescriptor> desc,
bool& cacheOnHolder)
{
cacheOnHolder = false;
DOMObjectType type;
const NativePropertyHooks *nativePropertyHooks =
GetNativePropertyHooks(cx, obj, type);
const NativePropertiesHolder& nativeProperties =
nativePropertyHooks->mNativeProperties;
ResolveOwnProperty resolveOwnProperty =
nativePropertyHooks->mResolveOwnProperty;
if (type == eNamedPropertiesObject) {
// None of these should be cached on the holder, since they're dynamic.
return resolveOwnProperty(cx, wrapper, obj, id, desc);
}
// Check for unforgeable properties first.
if (IsInstance(type)) {
const NativePropertiesHolder& nativeProperties =
nativePropertyHooks->mNativeProperties;
if (!XrayResolveUnforgeableProperty(cx, wrapper, obj, id, desc, cacheOnHolder,
nativeProperties.regular)) {
return false;
}
if (!desc.object() && xpc::AccessCheck::isChrome(wrapper) &&
!XrayResolveUnforgeableProperty(cx, wrapper, obj, id, desc, cacheOnHolder,
nativeProperties.chromeOnly)) {
return false;
}
if (desc.object()) {
return true;
}
}
if (IsInstance(type)) {
if (resolveOwnProperty) {
if (!resolveOwnProperty(cx, wrapper, obj, id, desc)) {
return false;
}
if (desc.object()) {
// None of these should be cached on the holder, since they're dynamic.
return true;
}
}
// If we're a special scope for in-content XBL, our script expects to see
// the bound XBL methods and attributes when accessing content. However,
// these members are implemented in content via custom-spliced prototypes,
// and thus aren't visible through Xray wrappers unless we handle them
// explicitly. So we check if we're running in such a scope, and if so,
// whether the wrappee is a bound element. If it is, we do a lookup via
// specialized XBL machinery.
//
// While we have to do some sketchy walking through content land, we should
// be protected by read-only/non-configurable properties, and any functions
// we end up with should _always_ be living in our own scope (the XBL scope).
// Make sure to assert that.
Element* element;
if (xpc::ObjectScope(wrapper)->IsContentXBLScope() &&
NS_SUCCEEDED(UNWRAP_OBJECT(Element, obj, element))) {
if (!nsContentUtils::LookupBindingMember(cx, element, id, desc)) {
return false;
}
DEBUG_CheckXBLLookup(cx, desc.address());
if (desc.object()) {
// XBL properties shouldn't be cached on the holder, as they might be
// shadowed by own properties returned from mResolveOwnProperty.
desc.object().set(wrapper);
return true;
}
}
// For non-global instance Xrays there are no other properties, so return
// here for them.
if (type != eGlobalInstance) {
return true;
}
} else if (type == eInterface) {
if (IdEquals(id, "prototype")) {
return nativePropertyHooks->mPrototypeID == prototypes::id::_ID_Count ||
ResolvePrototypeOrConstructor(cx, wrapper, obj,
nativePropertyHooks->mPrototypeID,
JSPROP_PERMANENT | JSPROP_READONLY,
desc, cacheOnHolder);
}
} else {
MOZ_ASSERT(IsInterfacePrototype(type));
if (IdEquals(id, "constructor")) {
return nativePropertyHooks->mConstructorID == constructors::id::_ID_Count ||
ResolvePrototypeOrConstructor(cx, wrapper, obj,
nativePropertyHooks->mConstructorID,
0, desc, cacheOnHolder);
}
// The properties for globals live on the instance, so return here as there
// are no properties on their interface prototype object.
if (type == eGlobalInterfacePrototype) {
return true;
}
}
if (nativeProperties.regular &&
!XrayResolveProperty(cx, wrapper, obj, id, desc, cacheOnHolder, type,
nativeProperties.regular)) {
return false;
}
if (!desc.object() &&
nativeProperties.chromeOnly &&
xpc::AccessCheck::isChrome(js::GetObjectCompartment(wrapper)) &&
!XrayResolveProperty(cx, wrapper, obj, id, desc, cacheOnHolder, type,
nativeProperties.chromeOnly)) {
return false;
}
return true;
}
bool
XrayDefineProperty(JSContext* cx, JS::Handle<JSObject*> wrapper,
JS::Handle<JSObject*> obj, JS::Handle<jsid> id,
JS::Handle<JSPropertyDescriptor> desc,
JS::ObjectOpResult &result, bool *defined)
{
if (!js::IsProxy(obj))
return true;
const DOMProxyHandler* handler = GetDOMProxyHandler(obj);
return handler->defineProperty(cx, wrapper, id, desc, result, defined);
}
template<typename SpecType>
bool
XrayAttributeOrMethodKeys(JSContext* cx, JS::Handle<JSObject*> wrapper,
JS::Handle<JSObject*> obj,
const Prefable<const SpecType>* list,
jsid* ids, const SpecType* specList,
unsigned flags, JS::AutoIdVector& props)
{
for (; list->specs; ++list) {
if (list->isEnabled(cx, obj)) {
// Set i to be the index into our full list of ids/specs that we're
// looking at now.
size_t i = list->specs - specList;
for ( ; ids[i] != JSID_VOID; ++i) {
// Skip non-enumerable properties and symbol-keyed properties unless
// they are specially requested via flags.
if (((flags & JSITER_HIDDEN) ||
(specList[i].flags & JSPROP_ENUMERATE)) &&
((flags & JSITER_SYMBOLS) || !JSID_IS_SYMBOL(ids[i])) &&
!props.append(ids[i])) {
return false;
}
}
}
}
return true;
}
#define ADD_KEYS_IF_DEFINED(fieldName) { \
if (nativeProperties->fieldName##s && \
!XrayAttributeOrMethodKeys(cx, wrapper, obj, \
nativeProperties->fieldName##s, \
nativeProperties->fieldName##Ids, \
nativeProperties->fieldName##Specs, \
flags, props)) { \
return false; \
} \
}
bool
XrayOwnPropertyKeys(JSContext* cx, JS::Handle<JSObject*> wrapper,
JS::Handle<JSObject*> obj,
unsigned flags, JS::AutoIdVector& props,
DOMObjectType type,
const NativeProperties* nativeProperties)
{
MOZ_ASSERT(type != eNamedPropertiesObject);
if (IsInstance(type)) {
ADD_KEYS_IF_DEFINED(unforgeableMethod);
ADD_KEYS_IF_DEFINED(unforgeableAttribute);
if (type == eGlobalInstance) {
ADD_KEYS_IF_DEFINED(method);
ADD_KEYS_IF_DEFINED(attribute);
}
} else if (type == eInterface) {
ADD_KEYS_IF_DEFINED(staticMethod);
ADD_KEYS_IF_DEFINED(staticAttribute);
} else if (type != eGlobalInterfacePrototype) {
MOZ_ASSERT(IsInterfacePrototype(type));
ADD_KEYS_IF_DEFINED(method);
ADD_KEYS_IF_DEFINED(attribute);
}
if (nativeProperties->constants) {
const Prefable<const ConstantSpec>* constant;
for (constant = nativeProperties->constants; constant->specs; ++constant) {
if (constant->isEnabled(cx, obj)) {
// Set i to be the index into our full list of ids/specs that we're
// looking at now.
size_t i = constant->specs - nativeProperties->constantSpecs;
for ( ; nativeProperties->constantIds[i] != JSID_VOID; ++i) {
if (!props.append(nativeProperties->constantIds[i])) {
return false;
}
}
}
}
}
return true;
}
#undef ADD_KEYS_IF_DEFINED
bool
XrayOwnNativePropertyKeys(JSContext* cx, JS::Handle<JSObject*> wrapper,
const NativePropertyHooks* nativePropertyHooks,
DOMObjectType type, JS::Handle<JSObject*> obj,
unsigned flags, JS::AutoIdVector& props)
{
MOZ_ASSERT(type != eNamedPropertiesObject);
if (type == eInterface &&
nativePropertyHooks->mPrototypeID != prototypes::id::_ID_Count &&
!AddStringToIDVector(cx, props, "prototype")) {
return false;
}
if (IsInterfacePrototype(type) &&
nativePropertyHooks->mConstructorID != constructors::id::_ID_Count &&
(flags & JSITER_HIDDEN) &&
!AddStringToIDVector(cx, props, "constructor")) {
return false;
}
const NativePropertiesHolder& nativeProperties =
nativePropertyHooks->mNativeProperties;
if (nativeProperties.regular &&
!XrayOwnPropertyKeys(cx, wrapper, obj, flags, props, type,
nativeProperties.regular)) {
return false;
}
if (nativeProperties.chromeOnly &&
xpc::AccessCheck::isChrome(js::GetObjectCompartment(wrapper)) &&
!XrayOwnPropertyKeys(cx, wrapper, obj, flags, props, type,
nativeProperties.chromeOnly)) {
return false;
}
return true;
}
bool
XrayOwnPropertyKeys(JSContext* cx, JS::Handle<JSObject*> wrapper,
JS::Handle<JSObject*> obj,
unsigned flags, JS::AutoIdVector& props)
{
DOMObjectType type;
const NativePropertyHooks* nativePropertyHooks =
GetNativePropertyHooks(cx, obj, type);
EnumerateOwnProperties enumerateOwnProperties =
nativePropertyHooks->mEnumerateOwnProperties;
if (type == eNamedPropertiesObject) {
return enumerateOwnProperties(cx, wrapper, obj, props);
}
if (IsInstance(type)) {
// FIXME https://bugzilla.mozilla.org/show_bug.cgi?id=1071189
// Should do something about XBL properties too.
if (enumerateOwnProperties &&
!enumerateOwnProperties(cx, wrapper, obj, props)) {
return false;
}
}
return type == eGlobalInterfacePrototype ||
XrayOwnNativePropertyKeys(cx, wrapper, nativePropertyHooks, type,
obj, flags, props);
}
NativePropertyHooks sEmptyNativePropertyHooks = {
nullptr,
nullptr,
{
nullptr,
nullptr
},
prototypes::id::_ID_Count,
constructors::id::_ID_Count,
nullptr
};
bool
GetPropertyOnPrototype(JSContext* cx, JS::Handle<JSObject*> proxy,
JS::Handle<JS::Value> receiver, JS::Handle<jsid> id,
bool* found, JS::MutableHandle<JS::Value> vp)
{
JS::Rooted<JSObject*> proto(cx);
if (!js::GetObjectProto(cx, proxy, &proto)) {
return false;
}
if (!proto) {
*found = false;
return true;
}
if (!JS_HasPropertyById(cx, proto, id, found)) {
return false;
}
if (!*found) {
return true;
}
return JS_ForwardGetPropertyTo(cx, proto, id, receiver, vp);
}
bool
HasPropertyOnPrototype(JSContext* cx, JS::Handle<JSObject*> proxy,
JS::Handle<jsid> id, bool* has)
{
JS::Rooted<JSObject*> proto(cx);
if (!js::GetObjectProto(cx, proxy, &proto)) {
return false;
}
if (!proto) {
*has = false;
return true;
}
return JS_HasPropertyById(cx, proto, id, has);
}
bool
AppendNamedPropertyIds(JSContext* cx, JS::Handle<JSObject*> proxy,
nsTArray<nsString>& names,
bool shadowPrototypeProperties,
JS::AutoIdVector& props)
{
for (uint32_t i = 0; i < names.Length(); ++i) {
JS::Rooted<JS::Value> v(cx);
if (!xpc::NonVoidStringToJsval(cx, names[i], &v)) {
return false;
}
JS::Rooted<jsid> id(cx);
if (!JS_ValueToId(cx, v, &id)) {
return false;
}
bool shouldAppend = shadowPrototypeProperties;
if (!shouldAppend) {
bool has;
if (!HasPropertyOnPrototype(cx, proxy, id, &has)) {
return false;
}
shouldAppend = !has;
}
if (shouldAppend) {
if (!props.append(id)) {
return false;
}
}
}
return true;
}
bool
DictionaryBase::ParseJSON(JSContext* aCx,
const nsAString& aJSON,
JS::MutableHandle<JS::Value> aVal)
{
if (aJSON.IsEmpty()) {
return true;
}
return JS_ParseJSON(aCx, PromiseFlatString(aJSON).get(), aJSON.Length(), aVal);
}
bool
DictionaryBase::StringifyToJSON(JSContext* aCx,
JS::MutableHandle<JS::Value> aValue,
nsAString& aJSON) const
{
return JS_Stringify(aCx, aValue, nullptr, JS::NullHandleValue,
AppendJSONToString, &aJSON);
}
/* static */
bool
DictionaryBase::AppendJSONToString(const char16_t* aJSONData,
uint32_t aDataLength,
void* aString)
{
nsAString* string = static_cast<nsAString*>(aString);
string->Append(aJSONData, aDataLength);
return true;
}
nsresult
ReparentWrapper(JSContext* aCx, JS::Handle<JSObject*> aObjArg)
{
js::AssertSameCompartment(aCx, aObjArg);
// Check if we're anywhere near the stack limit before we reach the
// transplanting code, since it has no good way to handle errors. This uses
// the untrusted script limit, which is not strictly necessary since no
// actual script should run.
if (MOZ_UNLIKELY(!js::CheckRecursionConservative(aCx))) {
return NS_ERROR_FAILURE;
}
JS::Rooted<JSObject*> aObj(aCx, aObjArg);
const DOMJSClass* domClass = GetDOMClass(aObj);
// DOM things are always parented to globals.
JS::Rooted<JSObject*> oldParent(aCx,
js::GetGlobalForObjectCrossCompartment(aObj));
MOZ_ASSERT(js::GetGlobalForObjectCrossCompartment(oldParent) == oldParent);
JS::Rooted<JSObject*> newParent(aCx, domClass->mGetParent(aCx, aObj));
MOZ_ASSERT(js::GetGlobalForObjectCrossCompartment(newParent) == newParent);
JSAutoCompartment oldAc(aCx, oldParent);
JSCompartment* oldCompartment = js::GetObjectCompartment(oldParent);
JSCompartment* newCompartment = js::GetObjectCompartment(newParent);
if (oldCompartment == newCompartment) {
MOZ_ASSERT(oldParent == newParent);
return NS_OK;
}
nsISupports* native = UnwrapDOMObjectToISupports(aObj);
if (!native) {
return NS_OK;
}
bool isProxy = js::IsProxy(aObj);
JS::Rooted<JSObject*> expandoObject(aCx);
if (isProxy) {
expandoObject = DOMProxyHandler::GetAndClearExpandoObject(aObj);
}
JSAutoCompartment newAc(aCx, newParent);
// First we clone the reflector. We get a copy of its properties and clone its
// expando chain.
JS::Handle<JSObject*> proto = (domClass->mGetProto)(aCx, newParent);
if (!proto) {
return NS_ERROR_FAILURE;
}
JS::Rooted<JSObject*> newobj(aCx, JS_CloneObject(aCx, aObj, proto));
if (!newobj) {
return NS_ERROR_FAILURE;
}
JS::Rooted<JSObject*> propertyHolder(aCx);
JS::Rooted<JSObject*> copyFrom(aCx, isProxy ? expandoObject : aObj);
if (copyFrom) {
propertyHolder = JS_NewObjectWithGivenProto(aCx, nullptr, nullptr);
if (!propertyHolder) {
return NS_ERROR_OUT_OF_MEMORY;
}
if (!JS_CopyPropertiesFrom(aCx, propertyHolder, copyFrom)) {
return NS_ERROR_FAILURE;
}
} else {
propertyHolder = nullptr;
}
// Expandos from other compartments are attached to the target JS object.
// Copy them over, and let the old ones die a natural death.
// Note that at this point the DOM_OBJECT_SLOT for |newobj| has not been set.
// CloneExpandoChain() will use this property of |newobj| when it calls
// preserveWrapper() via attachExpandoObject() if |aObj| has expandos set, and
// preserveWrapper() will not do anything in this case. This is safe because
// if expandos are present then the wrapper will already have been preserved
// for this native.
if (!xpc::XrayUtils::CloneExpandoChain(aCx, newobj, aObj)) {
return NS_ERROR_FAILURE;
}
// We've set up |newobj|, so we make it own the native by setting its reserved
// slot and nulling out the reserved slot of |obj|.
//
// NB: It's important to do this _after_ copying the properties to
// propertyHolder. Otherwise, an object with |foo.x === foo| will
// crash when JS_CopyPropertiesFrom tries to call wrap() on foo.x.
js::SetReservedOrProxyPrivateSlot(newobj, DOM_OBJECT_SLOT,
js::GetReservedOrProxyPrivateSlot(aObj, DOM_OBJECT_SLOT));
js::SetReservedOrProxyPrivateSlot(aObj, DOM_OBJECT_SLOT, JS::PrivateValue(nullptr));
aObj = xpc::TransplantObject(aCx, aObj, newobj);
if (!aObj) {
MOZ_CRASH();
}
nsWrapperCache* cache = nullptr;
CallQueryInterface(native, &cache);
bool preserving = cache->PreservingWrapper();
cache->SetPreservingWrapper(false);
cache->SetWrapper(aObj);
cache->SetPreservingWrapper(preserving);
if (propertyHolder) {
JS::Rooted<JSObject*> copyTo(aCx);
if (isProxy) {
copyTo = DOMProxyHandler::EnsureExpandoObject(aCx, aObj);
} else {
copyTo = aObj;
}
if (!copyTo || !JS_CopyPropertiesFrom(aCx, copyTo, propertyHolder)) {
MOZ_CRASH();
}
}
nsObjectLoadingContent* htmlobject;
nsresult rv = UNWRAP_OBJECT(HTMLObjectElement, aObj, htmlobject);
if (NS_FAILED(rv)) {
rv = UnwrapObject<prototypes::id::HTMLEmbedElement,
HTMLSharedObjectElement>(aObj, htmlobject);
if (NS_FAILED(rv)) {
rv = UnwrapObject<prototypes::id::HTMLAppletElement,
HTMLSharedObjectElement>(aObj, htmlobject);
if (NS_FAILED(rv)) {
htmlobject = nullptr;
}
}
}
if (htmlobject) {
htmlobject->SetupProtoChain(aCx, aObj);
}
// Now we can just return the wrapper
return NS_OK;
}
GlobalObject::GlobalObject(JSContext* aCx, JSObject* aObject)
: mGlobalJSObject(aCx),
mCx(aCx),
mGlobalObject(nullptr)
{
MOZ_ASSERT(mCx);
JS::Rooted<JSObject*> obj(aCx, aObject);
if (js::IsWrapper(obj)) {
obj = js::CheckedUnwrap(obj, /* stopAtWindowProxy = */ false);
if (!obj) {
// We should never end up here on a worker thread, since there shouldn't
// be any security wrappers to worry about.
if (!MOZ_LIKELY(NS_IsMainThread())) {
MOZ_CRASH();
}
Throw(aCx, NS_ERROR_XPC_SECURITY_MANAGER_VETO);
return;
}
}
mGlobalJSObject = js::GetGlobalForObjectCrossCompartment(obj);
}
nsISupports*
GlobalObject::GetAsSupports() const
{
if (mGlobalObject) {
return mGlobalObject;
}
MOZ_ASSERT(!js::IsWrapper(mGlobalJSObject));
// Most of our globals are DOM objects. Try that first. Note that this
// assumes that either the first nsISupports in the object is the canonical
// one or that we don't care about the canonical nsISupports here.
mGlobalObject = UnwrapDOMObjectToISupports(mGlobalJSObject);
if (mGlobalObject) {
return mGlobalObject;
}
MOZ_ASSERT(NS_IsMainThread(), "All our worker globals are DOM objects");
// Remove everything below here once all our global objects are using new
// bindings. If that ever happens; it would need to include Sandbox and
// BackstagePass.
// See whether mGlobalJSObject is an XPCWrappedNative. This will redo the
// IsWrapper bit above and the UnwrapDOMObjectToISupports in the case when
// we're not actually an XPCWrappedNative, but this should be a rare-ish case
// anyway.
mGlobalObject = xpc::UnwrapReflectorToISupports(mGlobalJSObject);
if (mGlobalObject) {
return mGlobalObject;
}
// And now a final hack. Sandbox is not a reflector, but it does have an
// nsIGlobalObject hanging out in its private slot. Handle that case here,
// (though again, this will do the useless UnwrapDOMObjectToISupports if we
// got here for something that is somehow not a DOM object, not an
// XPCWrappedNative _and_ not a Sandbox).
if (XPCConvert::GetISupportsFromJSObject(mGlobalJSObject, &mGlobalObject)) {
return mGlobalObject;
}
MOZ_ASSERT(!mGlobalObject);
Throw(mCx, NS_ERROR_XPC_BAD_CONVERT_JS);
return nullptr;
}
bool
InterfaceHasInstance(JSContext* cx, JS::Handle<JSObject*> obj,
JS::Handle<JSObject*> instance,
bool* bp)
{
const DOMIfaceAndProtoJSClass* clasp =
DOMIfaceAndProtoJSClass::FromJSClass(js::GetObjectClass(obj));
const DOMJSClass* domClass =
GetDOMClass(js::UncheckedUnwrap(instance, /* stopAtWindowProxy = */ false));
MOZ_ASSERT(!domClass || clasp->mPrototypeID != prototypes::id::_ID_Count,
"Why do we have a hasInstance hook if we don't have a prototype "
"ID?");
if (domClass &&
domClass->mInterfaceChain[clasp->mDepth] == clasp->mPrototypeID) {
*bp = true;
return true;
}
if (jsipc::IsWrappedCPOW(instance)) {
bool boolp = false;
if (!jsipc::DOMInstanceOf(cx, js::CheckedUnwrap(instance), clasp->mPrototypeID,
clasp->mDepth, &boolp)) {
return false;
}
*bp = boolp;
return true;
}
JS::Rooted<JS::Value> protov(cx);
DebugOnly<bool> ok = JS_GetProperty(cx, obj, "prototype", &protov);
MOZ_ASSERT(ok, "Someone messed with our prototype property?");
JS::Rooted<JSObject*> interfacePrototype(cx, &protov.toObject());
MOZ_ASSERT(IsDOMIfaceAndProtoClass(js::GetObjectClass(interfacePrototype)),
"Someone messed with our prototype property?");
JS::Rooted<JSObject*> proto(cx);
if (!JS_GetPrototype(cx, instance, &proto)) {
return false;
}
while (proto) {
if (proto == interfacePrototype) {
*bp = true;
return true;
}
if (!JS_GetPrototype(cx, proto, &proto)) {
return false;
}
}
*bp = false;
return true;
}
bool
InterfaceHasInstance(JSContext* cx, JS::Handle<JSObject*> obj, JS::MutableHandle<JS::Value> vp,
bool* bp)
{
if (!vp.isObject()) {
*bp = false;
return true;
}
JS::Rooted<JSObject*> instanceObject(cx, &vp.toObject());
return InterfaceHasInstance(cx, obj, instanceObject, bp);
}
bool
InterfaceHasInstance(JSContext* cx, int prototypeID, int depth,
JS::Handle<JSObject*> instance,
bool* bp)
{
const DOMJSClass* domClass = GetDOMClass(js::UncheckedUnwrap(instance));
MOZ_ASSERT(!domClass || prototypeID != prototypes::id::_ID_Count,
"Why do we have a hasInstance hook if we don't have a prototype "
"ID?");
*bp = (domClass && domClass->mInterfaceChain[depth] == prototypeID);
return true;
}
bool
ReportLenientThisUnwrappingFailure(JSContext* cx, JSObject* obj)
{
JS::Rooted<JSObject*> rootedObj(cx, obj);
GlobalObject global(cx, rootedObj);
if (global.Failed()) {
return false;
}
nsCOMPtr<nsPIDOMWindow> window = do_QueryInterface(global.GetAsSupports());
if (window && window->GetDoc()) {
window->GetDoc()->WarnOnceAbout(nsIDocument::eLenientThis);
}
return true;
}
bool
GetContentGlobalForJSImplementedObject(JSContext* cx, JS::Handle<JSObject*> obj,
nsIGlobalObject** globalObj)
{
// Be very careful to not get tricked here.
MOZ_ASSERT(NS_IsMainThread());
if (!xpc::AccessCheck::isChrome(js::GetObjectCompartment(obj))) {
NS_RUNTIMEABORT("Should have a chrome object here");
}
// Look up the content-side object.
JS::Rooted<JS::Value> domImplVal(cx);
if (!JS_GetProperty(cx, obj, "__DOM_IMPL__", &domImplVal)) {
return false;
}
if (!domImplVal.isObject()) {
ThrowErrorMessage(cx, MSG_NOT_OBJECT, "Value");
return false;
}
// Go ahead and get the global from it. GlobalObject will handle
// doing unwrapping as needed.
GlobalObject global(cx, &domImplVal.toObject());
if (global.Failed()) {
return false;
}
DebugOnly<nsresult> rv = CallQueryInterface(global.GetAsSupports(), globalObj);
MOZ_ASSERT(NS_SUCCEEDED(rv));
MOZ_ASSERT(*globalObj);
return true;
}
already_AddRefed<nsIGlobalObject>
ConstructJSImplementation(JSContext* aCx, const char* aContractId,
const GlobalObject& aGlobal,
JS::MutableHandle<JSObject*> aObject,
ErrorResult& aRv)
{
// Get the global object to use as a parent and for initialization.
nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(aGlobal.GetAsSupports());
if (!global) {
aRv.Throw(NS_ERROR_FAILURE);
return nullptr;
}
ConstructJSImplementation(aCx, aContractId, global, aObject, aRv);
if (aRv.Failed()) {
return nullptr;
}
return global.forget();
}
void
ConstructJSImplementation(JSContext* aCx, const char* aContractId,
nsIGlobalObject* aGlobal,
JS::MutableHandle<JSObject*> aObject,
ErrorResult& aRv)
{
// Make sure to divorce ourselves from the calling JS while creating and
// initializing the object, so exceptions from that will get reported
// properly, since those are never exceptions that a spec wants to be thrown.
{
AutoNoJSAPI nojsapi;
// Get the XPCOM component containing the JS implementation.
nsresult rv;
nsCOMPtr<nsISupports> implISupports = do_CreateInstance(aContractId, &rv);
if (!implISupports) {
nsPrintfCString msg("Failed to get JS implementation for contract \"%s\"",
aContractId);
NS_WARNING(msg.get());
aRv.Throw(rv);
return;
}
// Initialize the object, if it implements nsIDOMGlobalPropertyInitializer
// and our global is a window.
nsCOMPtr<nsIDOMGlobalPropertyInitializer> gpi =
do_QueryInterface(implISupports);
nsCOMPtr<nsPIDOMWindow> window = do_QueryInterface(aGlobal);
if (gpi) {
JS::Rooted<JS::Value> initReturn(aCx);
rv = gpi->Init(window, &initReturn);
if (NS_FAILED(rv)) {
aRv.Throw(rv);
return;
}
// With JS-implemented WebIDL, the return value of init() is not used to determine
// if init() failed, so init() should only return undefined. Any kind of permission
// or pref checking must happen by adding an attribute to the WebIDL interface.
if (!initReturn.isUndefined()) {
MOZ_ASSERT(false, "The init() method for JS-implemented WebIDL should not return anything");
MOZ_CRASH();
}
}
// Extract the JS implementation from the XPCOM object.
nsCOMPtr<nsIXPConnectWrappedJS> implWrapped =
do_QueryInterface(implISupports, &rv);
MOZ_ASSERT(implWrapped, "Failed to get wrapped JS from XPCOM component.");
if (!implWrapped) {
aRv.Throw(rv);
return;
}
aObject.set(implWrapped->GetJSObject());
if (!aObject) {
aRv.Throw(NS_ERROR_FAILURE);
}
}
}
bool
NonVoidByteStringToJsval(JSContext *cx, const nsACString &str,
JS::MutableHandle<JS::Value> rval)
{
// ByteStrings are not UTF-8 encoded.
JSString* jsStr = JS_NewStringCopyN(cx, str.Data(), str.Length());
if (!jsStr)
return false;
rval.setString(jsStr);
return true;
}
template<typename T> static void
NormalizeUSVStringInternal(JSContext* aCx, T& aString)
{
char16_t* start = aString.BeginWriting();
// Must use const here because we can't pass char** to UTF16CharEnumerator as
// it expects const char**. Unclear why this is illegal...
const char16_t* nextChar = start;
const char16_t* end = aString.Data() + aString.Length();
while (nextChar < end) {
uint32_t enumerated = UTF16CharEnumerator::NextChar(&nextChar, end);
if (enumerated == UCS2_REPLACEMENT_CHAR) {
int32_t lastCharIndex = (nextChar - start) - 1;
start[lastCharIndex] = static_cast<char16_t>(enumerated);
}
}
}
void
NormalizeUSVString(JSContext* aCx, nsAString& aString)
{
NormalizeUSVStringInternal(aCx, aString);
}
void
NormalizeUSVString(JSContext* aCx, binding_detail::FakeString& aString)
{
NormalizeUSVStringInternal(aCx, aString);
}
bool
ConvertJSValueToByteString(JSContext* cx, JS::Handle<JS::Value> v,
bool nullable, nsACString& result)
{
JS::Rooted<JSString*> s(cx);
if (v.isString()) {
s = v.toString();
} else {
if (nullable && v.isNullOrUndefined()) {
result.SetIsVoid(true);
return true;
}
s = JS::ToString(cx, v);
if (!s) {
return false;
}
}
// Conversion from Javascript string to ByteString is only valid if all
// characters < 256. This is always the case for Latin1 strings.
size_t length;
if (!js::StringHasLatin1Chars(s)) {
// ThrowErrorMessage can GC, so we first scan the string for bad chars
// and report the error outside the AutoCheckCannotGC scope.
bool foundBadChar = false;
size_t badCharIndex;
char16_t badChar;
{
JS::AutoCheckCannotGC nogc;
const char16_t* chars = JS_GetTwoByteStringCharsAndLength(cx, nogc, s, &length);
if (!chars) {
return false;
}
for (size_t i = 0; i < length; i++) {
if (chars[i] > 255) {
badCharIndex = i;
badChar = chars[i];
foundBadChar = true;
break;
}
}
}
if (foundBadChar) {
MOZ_ASSERT(badCharIndex < length);
MOZ_ASSERT(badChar > 255);
// The largest unsigned 64 bit number (18,446,744,073,709,551,615) has
// 20 digits, plus one more for the null terminator.
char index[21];
static_assert(sizeof(size_t) <= 8, "index array too small");
PR_snprintf(index, sizeof(index), "%d", badCharIndex);
// A char16_t is 16 bits long. The biggest unsigned 16 bit
// number (65,535) has 5 digits, plus one more for the null
// terminator.
char badCharArray[6];
static_assert(sizeof(char16_t) <= 2, "badCharArray too small");
PR_snprintf(badCharArray, sizeof(badCharArray), "%d", badChar);
ThrowErrorMessage(cx, MSG_INVALID_BYTESTRING, index, badCharArray);
return false;
}
} else {
length = js::GetStringLength(s);
}
static_assert(js::MaxStringLength < UINT32_MAX,
"length+1 shouldn't overflow");
result.SetLength(length);
JS_EncodeStringToBuffer(cx, s, result.BeginWriting(), length);
return true;
}
bool
IsInPrivilegedApp(JSContext* aCx, JSObject* aObj)
{
using mozilla::dom::workers::GetWorkerPrivateFromContext;
if (!NS_IsMainThread()) {
return GetWorkerPrivateFromContext(aCx)->IsInPrivilegedApp();
}
nsIPrincipal* principal = nsContentUtils::ObjectPrincipal(aObj);
uint16_t appStatus = principal->GetAppStatus();
return (appStatus == nsIPrincipal::APP_STATUS_CERTIFIED ||
appStatus == nsIPrincipal::APP_STATUS_PRIVILEGED) ||
Preferences::GetBool("dom.ignore_webidl_scope_checks", false);
}
bool
IsInCertifiedApp(JSContext* aCx, JSObject* aObj)
{
using mozilla::dom::workers::GetWorkerPrivateFromContext;
if (!NS_IsMainThread()) {
return GetWorkerPrivateFromContext(aCx)->IsInCertifiedApp();
}
nsIPrincipal* principal = nsContentUtils::ObjectPrincipal(aObj);
return principal->GetAppStatus() == nsIPrincipal::APP_STATUS_CERTIFIED ||
Preferences::GetBool("dom.ignore_webidl_scope_checks", false);
}
void
FinalizeGlobal(JSFreeOp* aFreeOp, JSObject* aObj)
{
MOZ_ASSERT(js::GetObjectClass(aObj)->flags & JSCLASS_DOM_GLOBAL);
mozilla::dom::DestroyProtoAndIfaceCache(aObj);
}
bool
ResolveGlobal(JSContext* aCx, JS::Handle<JSObject*> aObj,
JS::Handle<jsid> aId, bool* aResolvedp)
{
MOZ_ASSERT(JS_IsGlobalObject(aObj),
"Should have a global here, since we plan to resolve standard "
"classes!");
return JS_ResolveStandardClass(aCx, aObj, aId, aResolvedp);
}
bool
MayResolveGlobal(const JSAtomState& aNames, jsid aId, JSObject* aMaybeObj)
{
return JS_MayResolveStandardClass(aNames, aId, aMaybeObj);
}
bool
EnumerateGlobal(JSContext* aCx, JS::Handle<JSObject*> aObj)
{
MOZ_ASSERT(JS_IsGlobalObject(aObj),
"Should have a global here, since we plan to enumerate standard "
"classes!");
return JS_EnumerateStandardClasses(aCx, aObj);
}
bool
CheckAnyPermissions(JSContext* aCx, JSObject* aObj, const char* const aPermissions[])
{
JS::Rooted<JSObject*> rootedObj(aCx, aObj);
nsPIDOMWindow* window = xpc::WindowGlobalOrNull(rootedObj);
if (!window) {
return false;
}
nsCOMPtr<nsIPermissionManager> permMgr = services::GetPermissionManager();
NS_ENSURE_TRUE(permMgr, false);
do {
uint32_t permission = nsIPermissionManager::DENY_ACTION;
permMgr->TestPermissionFromWindow(window, *aPermissions, &permission);
if (permission == nsIPermissionManager::ALLOW_ACTION) {
return true;
}
} while (*(++aPermissions));
return false;
}
bool
CheckAllPermissions(JSContext* aCx, JSObject* aObj, const char* const aPermissions[])
{
JS::Rooted<JSObject*> rootedObj(aCx, aObj);
nsPIDOMWindow* window = xpc::WindowGlobalOrNull(rootedObj);
if (!window) {
return false;
}
nsCOMPtr<nsIPermissionManager> permMgr = services::GetPermissionManager();
NS_ENSURE_TRUE(permMgr, false);
do {
uint32_t permission = nsIPermissionManager::DENY_ACTION;
permMgr->TestPermissionFromWindow(window, *aPermissions, &permission);
if (permission != nsIPermissionManager::ALLOW_ACTION) {
return false;
}
} while (*(++aPermissions));
return true;
}
bool
IsNonExposedGlobal(JSContext* aCx, JSObject* aGlobal,
uint32_t aNonExposedGlobals)
{
MOZ_ASSERT(aNonExposedGlobals, "Why did we get called?");
MOZ_ASSERT((aNonExposedGlobals &
~(GlobalNames::Window |
GlobalNames::BackstagePass |
GlobalNames::DedicatedWorkerGlobalScope |
GlobalNames::SharedWorkerGlobalScope |
GlobalNames::ServiceWorkerGlobalScope |
GlobalNames::WorkerDebuggerGlobalScope)) == 0,
"Unknown non-exposed global type");
const char* name = js::GetObjectClass(aGlobal)->name;
if ((aNonExposedGlobals & GlobalNames::Window) &&
!strcmp(name, "Window")) {
return true;
}
if ((aNonExposedGlobals & GlobalNames::BackstagePass) &&
!strcmp(name, "BackstagePass")) {
return true;
}
if ((aNonExposedGlobals & GlobalNames::DedicatedWorkerGlobalScope) &&
!strcmp(name, "DedicatedWorkerGlobalScope")) {
return true;
}
if ((aNonExposedGlobals & GlobalNames::SharedWorkerGlobalScope) &&
!strcmp(name, "SharedWorkerGlobalScope")) {
return true;
}
if ((aNonExposedGlobals & GlobalNames::ServiceWorkerGlobalScope) &&
!strcmp(name, "ServiceWorkerGlobalScope")) {
return true;
}
if ((aNonExposedGlobals & GlobalNames::WorkerDebuggerGlobalScope) &&
!strcmp(name, "WorkerDebuggerGlobalScopex")) {
return true;
}
return false;
}
void
HandlePrerenderingViolation(nsPIDOMWindow* aWindow)
{
// Suspend the window and its workers, and its children too.
aWindow->SuspendTimeouts();
// Suspend event handling on the document
nsCOMPtr<nsIDocument> doc = aWindow->GetExtantDoc();
if (doc) {
doc->SuppressEventHandling(nsIDocument::eEvents);
}
}
bool
EnforceNotInPrerendering(JSContext* aCx, JSObject* aObj)
{
JS::Rooted<JSObject*> thisObj(aCx, js::CheckedUnwrap(aObj));
if (!thisObj) {
// Without a this object, we cannot check the safety.
return true;
}
nsGlobalWindow* window = xpc::WindowGlobalOrNull(thisObj);
if (!window) {
// Without a window, we cannot check the safety.
return true;
}
if (window->GetIsPrerendered()) {
HandlePrerenderingViolation(window);
// When the bindings layer sees a false return value, it returns false form
// the JSNative in order to trigger an uncatchable exception.
return false;
}
return true;
}
bool
GenericBindingGetter(JSContext* cx, unsigned argc, JS::Value* vp)
{
JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
const JSJitInfo *info = FUNCTION_VALUE_TO_JITINFO(args.calleev());
prototypes::ID protoID = static_cast<prototypes::ID>(info->protoID);
if (!args.thisv().isObject()) {
return ThrowInvalidThis(cx, args,
MSG_GETTER_THIS_DOES_NOT_IMPLEMENT_INTERFACE,
protoID);
}
JS::Rooted<JSObject*> obj(cx, &args.thisv().toObject());
void* self;
{
nsresult rv = UnwrapObject<void>(obj, self, protoID, info->depth);
if (NS_FAILED(rv)) {
return ThrowInvalidThis(cx, args,
GetInvalidThisErrorForGetter(rv == NS_ERROR_XPC_SECURITY_MANAGER_VETO),
protoID);
}
}
MOZ_ASSERT(info->type() == JSJitInfo::Getter);
JSJitGetterOp getter = info->getter;
bool ok = getter(cx, obj, self, JSJitGetterCallArgs(args));
#ifdef DEBUG
if (ok) {
AssertReturnTypeMatchesJitinfo(info, args.rval());
}
#endif
return ok;
}
bool
GenericBindingSetter(JSContext* cx, unsigned argc, JS::Value* vp)
{
JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
const JSJitInfo *info = FUNCTION_VALUE_TO_JITINFO(args.calleev());
prototypes::ID protoID = static_cast<prototypes::ID>(info->protoID);
if (!args.thisv().isObject()) {
return ThrowInvalidThis(cx, args,
MSG_SETTER_THIS_DOES_NOT_IMPLEMENT_INTERFACE,
protoID);
}
JS::Rooted<JSObject*> obj(cx, &args.thisv().toObject());
void* self;
{
nsresult rv = UnwrapObject<void>(obj, self, protoID, info->depth);
if (NS_FAILED(rv)) {
return ThrowInvalidThis(cx, args,
GetInvalidThisErrorForSetter(rv == NS_ERROR_XPC_SECURITY_MANAGER_VETO),
protoID);
}
}
if (args.length() == 0) {
return ThrowNoSetterArg(cx, protoID);
}
MOZ_ASSERT(info->type() == JSJitInfo::Setter);
JSJitSetterOp setter = info->setter;
if (!setter(cx, obj, self, JSJitSetterCallArgs(args))) {
return false;
}
args.rval().setUndefined();
#ifdef DEBUG
AssertReturnTypeMatchesJitinfo(info, args.rval());
#endif
return true;
}
bool
GenericBindingMethod(JSContext* cx, unsigned argc, JS::Value* vp)
{
JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
const JSJitInfo *info = FUNCTION_VALUE_TO_JITINFO(args.calleev());
prototypes::ID protoID = static_cast<prototypes::ID>(info->protoID);
if (!args.thisv().isObject()) {
return ThrowInvalidThis(cx, args,
MSG_METHOD_THIS_DOES_NOT_IMPLEMENT_INTERFACE,
protoID);
}
JS::Rooted<JSObject*> obj(cx, &args.thisv().toObject());
void* self;
{
nsresult rv = UnwrapObject<void>(obj, self, protoID, info->depth);
if (NS_FAILED(rv)) {
return ThrowInvalidThis(cx, args,
GetInvalidThisErrorForMethod(rv == NS_ERROR_XPC_SECURITY_MANAGER_VETO),
protoID);
}
}
MOZ_ASSERT(info->type() == JSJitInfo::Method);
JSJitMethodOp method = info->method;
bool ok = method(cx, obj, self, JSJitMethodCallArgs(args));
#ifdef DEBUG
if (ok) {
AssertReturnTypeMatchesJitinfo(info, args.rval());
}
#endif
return ok;
}
bool
GenericPromiseReturningBindingMethod(JSContext* cx, unsigned argc, JS::Value* vp)
{
// Make sure to save the callee before someone maybe messes with rval().
JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
JS::Rooted<JSObject*> callee(cx, &args.callee());
// We could invoke GenericBindingMethod here, but that involves an
// extra call. Manually inline it instead.
const JSJitInfo *info = FUNCTION_VALUE_TO_JITINFO(args.calleev());
prototypes::ID protoID = static_cast<prototypes::ID>(info->protoID);
if (!args.thisv().isObject()) {
ThrowInvalidThis(cx, args,
MSG_METHOD_THIS_DOES_NOT_IMPLEMENT_INTERFACE,
protoID);
return ConvertExceptionToPromise(cx, xpc::XrayAwareCalleeGlobal(callee),
args.rval());
}
JS::Rooted<JSObject*> obj(cx, &args.thisv().toObject());
void* self;
{
nsresult rv = UnwrapObject<void>(obj, self, protoID, info->depth);
if (NS_FAILED(rv)) {
ThrowInvalidThis(cx, args,
GetInvalidThisErrorForMethod(rv == NS_ERROR_XPC_SECURITY_MANAGER_VETO),
protoID);
return ConvertExceptionToPromise(cx, xpc::XrayAwareCalleeGlobal(callee),
args.rval());
}
}
MOZ_ASSERT(info->type() == JSJitInfo::Method);
JSJitMethodOp method = info->method;
bool ok = method(cx, obj, self, JSJitMethodCallArgs(args));
if (ok) {
#ifdef DEBUG
AssertReturnTypeMatchesJitinfo(info, args.rval());
#endif
return true;
}
// Promise-returning methods always return objects
MOZ_ASSERT(info->returnType() == JSVAL_TYPE_OBJECT);
return ConvertExceptionToPromise(cx, xpc::XrayAwareCalleeGlobal(callee),
args.rval());
}
bool
StaticMethodPromiseWrapper(JSContext* cx, unsigned argc, JS::Value* vp)
{
// Make sure to save the callee before someone maybe messes with rval().
JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
JS::Rooted<JSObject*> callee(cx, &args.callee());
const JSJitInfo *info = FUNCTION_VALUE_TO_JITINFO(args.calleev());
MOZ_ASSERT(info);
MOZ_ASSERT(info->type() == JSJitInfo::StaticMethod);
bool ok = info->staticMethod(cx, argc, vp);
if (ok) {
return true;
}
return ConvertExceptionToPromise(cx, xpc::XrayAwareCalleeGlobal(callee),
args.rval());
}
bool
ConvertExceptionToPromise(JSContext* cx,
JSObject* promiseScope,
JS::MutableHandle<JS::Value> rval)
{
GlobalObject global(cx, promiseScope);
if (global.Failed()) {
return false;
}
JS::Rooted<JS::Value> exn(cx);
if (!JS_GetPendingException(cx, &exn)) {
// This is very important: if there is no pending exception here but we're
// ending up in this code, that means the callee threw an uncatchable
// exception. Just propagate that out as-is.
return false;
}
JS_ClearPendingException(cx);
nsCOMPtr<nsIGlobalObject> globalObj =
do_QueryInterface(global.GetAsSupports());
if (!globalObj) {
ErrorResult rv;
rv.Throw(NS_ERROR_UNEXPECTED);
return !rv.MaybeSetPendingException(cx);
}
ErrorResult rv;
RefPtr<Promise> promise = Promise::Reject(globalObj, cx, exn, rv);
if (rv.MaybeSetPendingException(cx)) {
// We just give up. We put the exception from the ErrorResult on
// the JSContext just to make sure to not leak memory on the
// ErrorResult, but now just put the original exception back.
JS_SetPendingException(cx, exn);
return false;
}
return GetOrCreateDOMReflector(cx, promise, rval);
}
/* static */
void
CreateGlobalOptions<nsGlobalWindow>::TraceGlobal(JSTracer* aTrc, JSObject* aObj)
{
xpc::TraceXPCGlobal(aTrc, aObj);
}
static bool sRegisteredDOMNames = false;
nsresult
RegisterDOMNames()
{
if (sRegisteredDOMNames) {
return NS_OK;
}
nsresult rv = nsDOMClassInfo::Init();
if (NS_FAILED(rv)) {
NS_ERROR("Could not initialize nsDOMClassInfo");
return rv;
}
// Register new DOM bindings
nsScriptNameSpaceManager* nameSpaceManager = GetNameSpaceManager();
if (!nameSpaceManager) {
NS_ERROR("Could not initialize nsScriptNameSpaceManager");
return NS_ERROR_FAILURE;
}
mozilla::dom::Register(nameSpaceManager);
sRegisteredDOMNames = true;
return NS_OK;
}
/* static */
bool
CreateGlobalOptions<nsGlobalWindow>::PostCreateGlobal(JSContext* aCx,
JS::Handle<JSObject*> aGlobal)
{
nsresult rv = RegisterDOMNames();
if (NS_FAILED(rv)) {
return Throw(aCx, rv);
}
// Invoking the XPCWrappedNativeScope constructor automatically hooks it
// up to the compartment of aGlobal.
(void) new XPCWrappedNativeScope(aCx, aGlobal);
return true;
}
#ifdef DEBUG
void
AssertReturnTypeMatchesJitinfo(const JSJitInfo* aJitInfo,
JS::Handle<JS::Value> aValue)
{
switch (aJitInfo->returnType()) {
case JSVAL_TYPE_UNKNOWN:
// Any value is good.
break;
case JSVAL_TYPE_DOUBLE:
// The value could actually be an int32 value as well.
MOZ_ASSERT(aValue.isNumber());
break;
case JSVAL_TYPE_INT32:
MOZ_ASSERT(aValue.isInt32());
break;
case JSVAL_TYPE_UNDEFINED:
MOZ_ASSERT(aValue.isUndefined());
break;
case JSVAL_TYPE_BOOLEAN:
MOZ_ASSERT(aValue.isBoolean());
break;
case JSVAL_TYPE_STRING:
MOZ_ASSERT(aValue.isString());
break;
case JSVAL_TYPE_NULL:
MOZ_ASSERT(aValue.isNull());
break;
case JSVAL_TYPE_OBJECT:
MOZ_ASSERT(aValue.isObject());
break;
default:
// Someone messed up their jitinfo type.
MOZ_ASSERT(false, "Unexpected JSValueType stored in jitinfo");
break;
}
}
#endif
bool
CallerSubsumes(JSObject *aObject)
{
nsIPrincipal* objPrin = nsContentUtils::ObjectPrincipal(js::UncheckedUnwrap(aObject));
return nsContentUtils::SubjectPrincipal()->Subsumes(objPrin);
}
nsresult
UnwrapArgImpl(JS::Handle<JSObject*> src,
const nsIID &iid,
void **ppArg)
{
if (!NS_IsMainThread()) {
return NS_ERROR_NOT_AVAILABLE;
}
nsISupports *iface = xpc::UnwrapReflectorToISupports(src);
if (iface) {
if (NS_FAILED(iface->QueryInterface(iid, ppArg))) {
return NS_ERROR_XPC_BAD_CONVERT_JS;
}
return NS_OK;
}
RefPtr<nsXPCWrappedJS> wrappedJS;
nsresult rv = nsXPCWrappedJS::GetNewOrUsed(src, iid, getter_AddRefs(wrappedJS));
if (NS_FAILED(rv) || !wrappedJS) {
return rv;
}
// We need to go through the QueryInterface logic to make this return
// the right thing for the various 'special' interfaces; e.g.
// nsIPropertyBag. We must use AggregatedQueryInterface in cases where
// there is an outer to avoid nasty recursion.
return wrappedJS->QueryInterface(iid, ppArg);
}
bool
SystemGlobalResolve(JSContext* cx, JS::Handle<JSObject*> obj,
JS::Handle<jsid> id, bool* resolvedp)
{
if (!ResolveGlobal(cx, obj, id, resolvedp)) {
return false;
}
if (*resolvedp) {
return true;
}
return ResolveSystemBinding(cx, obj, id, resolvedp);
}
bool
SystemGlobalEnumerate(JSContext* cx, JS::Handle<JSObject*> obj)
{
bool ignored = false;
return EnumerateGlobal(cx, obj) &&
ResolveSystemBinding(cx, obj, JSID_VOIDHANDLE, &ignored);
}
template<decltype(JS::NewMapObject) Method>
bool
GetMaplikeSetlikeBackingObject(JSContext* aCx, JS::Handle<JSObject*> aObj,
size_t aSlotIndex,
JS::MutableHandle<JSObject*> aBackingObj,
bool* aBackingObjCreated)
{
JS::Rooted<JSObject*> reflector(aCx);
reflector = IsDOMObject(aObj) ? aObj : js::UncheckedUnwrap(aObj,
/* stopAtWindowProxy = */ false);
// Retrieve the backing object from the reserved slot on the maplike/setlike
// object. If it doesn't exist yet, create it.
JS::Rooted<JS::Value> slotValue(aCx);
slotValue = js::GetReservedSlot(reflector, aSlotIndex);
if (slotValue.isUndefined()) {
// Since backing object access can happen in non-originating compartments,
// make sure to create the backing object in reflector compartment.
{
JSAutoCompartment ac(aCx, reflector);
JS::Rooted<JSObject*> newBackingObj(aCx);
newBackingObj.set(Method(aCx));
if (NS_WARN_IF(!newBackingObj)) {
return false;
}
js::SetReservedSlot(reflector, aSlotIndex, JS::ObjectValue(*newBackingObj));
}
slotValue = js::GetReservedSlot(reflector, aSlotIndex);
*aBackingObjCreated = true;
} else {
*aBackingObjCreated = false;
}
if (!MaybeWrapNonDOMObjectValue(aCx, &slotValue)) {
return false;
}
aBackingObj.set(&slotValue.toObject());
return true;
}
bool
GetMaplikeBackingObject(JSContext* aCx, JS::Handle<JSObject*> aObj,
size_t aSlotIndex,
JS::MutableHandle<JSObject*> aBackingObj,
bool* aBackingObjCreated)
{
return GetMaplikeSetlikeBackingObject<JS::NewMapObject>(aCx, aObj, aSlotIndex,
aBackingObj,
aBackingObjCreated);
}
bool
GetSetlikeBackingObject(JSContext* aCx, JS::Handle<JSObject*> aObj,
size_t aSlotIndex,
JS::MutableHandle<JSObject*> aBackingObj,
bool* aBackingObjCreated)
{
return GetMaplikeSetlikeBackingObject<JS::NewSetObject>(aCx, aObj, aSlotIndex,
aBackingObj,
aBackingObjCreated);
}
bool
ForEachHandler(JSContext* aCx, unsigned aArgc, JS::Value* aVp)
{
JS::CallArgs args = CallArgsFromVp(aArgc, aVp);
// Unpack callback and object from slots
JS::Rooted<JS::Value>
callbackFn(aCx, js::GetFunctionNativeReserved(&args.callee(),
FOREACH_CALLBACK_SLOT));
JS::Rooted<JS::Value>
maplikeOrSetlikeObj(aCx,
js::GetFunctionNativeReserved(&args.callee(),
FOREACH_MAPLIKEORSETLIKEOBJ_SLOT));
MOZ_ASSERT(aArgc == 3);
JS::AutoValueVector newArgs(aCx);
// Arguments are passed in as value, key, object. Keep value and key, replace
// object with the maplike/setlike object.
newArgs.append(args.get(0));
newArgs.append(args.get(1));
newArgs.append(maplikeOrSetlikeObj);
JS::Rooted<JS::Value> rval(aCx, JS::UndefinedValue());
// Now actually call the user specified callback
return JS::Call(aCx, args.thisv(), callbackFn, newArgs, &rval);
}
static inline prototypes::ID
GetProtoIdForNewtarget(JS::Handle<JSObject*> aNewTarget)
{
const js::Class* newTargetClass = js::GetObjectClass(aNewTarget);
if (IsDOMIfaceAndProtoClass(newTargetClass)) {
const DOMIfaceAndProtoJSClass* newTargetIfaceClass =
DOMIfaceAndProtoJSClass::FromJSClass(newTargetClass);
if (newTargetIfaceClass->mType == eInterface) {
return newTargetIfaceClass->mPrototypeID;
}
} else if (JS_IsNativeFunction(aNewTarget, Constructor)) {
return GetNativePropertyHooksFromConstructorFunction(aNewTarget)->mPrototypeID;
}
return prototypes::id::_ID_Count;
}
bool
GetDesiredProto(JSContext* aCx, const JS::CallArgs& aCallArgs,
JS::MutableHandle<JSObject*> aDesiredProto)
{
if (!aCallArgs.isConstructing()) {
aDesiredProto.set(nullptr);
return true;
}
// The desired prototype depends on the actual constructor that was invoked,
// which is passed to us as the newTarget in the callargs. We want to do
// something akin to the ES6 specification's GetProtototypeFromConstructor (so
// get .prototype on the newTarget, with a fallback to some sort of default).
// First, a fast path for the case when the the constructor is in fact one of
// our DOM constructors. This is safe because on those the "constructor"
// property is non-configurable and non-writable, so we don't have to do the
// slow JS_GetProperty call.
JS::Rooted<JSObject*> newTarget(aCx, &aCallArgs.newTarget().toObject());
JS::Rooted<JSObject*> originalNewTarget(aCx, newTarget);
// See whether we have a known DOM constructor here, such that we can take a
// fast path.
prototypes::ID protoID = GetProtoIdForNewtarget(newTarget);
if (protoID == prototypes::id::_ID_Count) {
// We might still have a cross-compartment wrapper for a known DOM
// constructor.
newTarget = js::CheckedUnwrap(newTarget);
if (newTarget && newTarget != originalNewTarget) {
protoID = GetProtoIdForNewtarget(newTarget);
}
}
if (protoID != prototypes::id::_ID_Count) {
ProtoAndIfaceCache& protoAndIfaceCache =
*GetProtoAndIfaceCache(js::GetGlobalForObjectCrossCompartment(newTarget));
aDesiredProto.set(protoAndIfaceCache.EntrySlotMustExist(protoID));
if (newTarget != originalNewTarget) {
return JS_WrapObject(aCx, aDesiredProto);
}
return true;
}
// Slow path. This basically duplicates the ES6 spec's
// GetPrototypeFromConstructor except that instead of taking a string naming
// the fallback prototype we just fall back to using null and assume that our
// caller will then pick the right default. The actual defaulting behavior
// here still needs to be defined in the Web IDL specification.
//
// Note that it's very important to do this property get on originalNewTarget,
// not our unwrapped newTarget, since we want to get Xray behavior here as
// needed.
// XXXbz for speed purposes, using a preinterned id here sure would be nice.
JS::Rooted<JS::Value> protoVal(aCx);
if (!JS_GetProperty(aCx, originalNewTarget, "prototype", &protoVal)) {
return false;
}
if (!protoVal.isObject()) {
aDesiredProto.set(nullptr);
return true;
}
aDesiredProto.set(&protoVal.toObject());
return true;
}
#ifdef DEBUG
namespace binding_detail {
void
AssertReflectorHasGivenProto(JSContext* aCx, JSObject* aReflector,
JS::Handle<JSObject*> aGivenProto)
{
if (!aGivenProto) {
// Nothing to assert here
return;
}
JS::Rooted<JSObject*> reflector(aCx, aReflector);
JSAutoCompartment ac(aCx, reflector);
JS::Rooted<JSObject*> reflectorProto(aCx);
bool ok = JS_GetPrototype(aCx, reflector, &reflectorProto);
MOZ_ASSERT(ok);
// aGivenProto may not be in the right compartment here, so we
// have to wrap it to compare.
JS::Rooted<JSObject*> givenProto(aCx, aGivenProto);
ok = JS_WrapObject(aCx, &givenProto);
MOZ_ASSERT(ok);
MOZ_ASSERT(givenProto == reflectorProto,
"How are we supposed to change the proto now?");
}
} // namespace binding_detail
#endif // DEBUG
void
SetDocumentAndPageUseCounter(JSContext* aCx, JSObject* aObject,
UseCounter aUseCounter)
{
nsGlobalWindow* win = xpc::WindowGlobalOrNull(js::UncheckedUnwrap(aObject));
if (win && win->GetDocument()) {
win->GetDocument()->SetDocumentAndPageUseCounter(aUseCounter);
}
}
void
DeprecationWarning(JSContext* aCx, JSObject* aObject,
nsIDocument::DeprecatedOperations aOperation)
{
GlobalObject global(aCx, aObject);
if (global.Failed()) {
NS_ERROR("Could not create global for DeprecationWarning");
return;
}
nsCOMPtr<nsPIDOMWindow> window = do_QueryInterface(global.GetAsSupports());
if (window && window->GetExtantDoc()) {
window->GetExtantDoc()->WarnOnceAbout(aOperation);
}
}
} // namespace dom
} // namespace mozilla
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