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UXP-mirror/dom/bindings/BindingUtils.cpp
T
athenian200 b787af5702 Issue #1638 - Part 1: Put NPAPI code behind MOZ_ENABLE_NPAPI. 
Adds --disable-npapi as an additional build option. The default is still to build in NPAPI compatibility, but with this flag, it's finally possible to build without pulling in GTK2 on systems that don't have the package.

This essentially ifdefs everything associated with NPAPI, following various Mozilla removal bugs.

Ref: BZ 1682030, BZ 1251202, BZ 1217665, BZ 1687239
2024-01-10 04:03:35 -06:00

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/Assertions.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/FloatingPoint.h"
#include "mozilla/Preferences.h"
#include "mozilla/SizePrintfMacros.h"
#include "mozilla/Unused.h"
#include "mozilla/dom/DocGroup.h"
#include "AccessCheck.h"
#include "jsfriendapi.h"
#include "nsContentCreatorFunctions.h"
#include "nsContentUtils.h"
#include "nsGlobalWindow.h"
#include "nsHTMLTags.h"
#include "nsIDocShell.h"
#include "nsIDOMGlobalPropertyInitializer.h"
#include "nsIPermissionManager.h"
#include "nsIPrincipal.h"
#include "nsIXPConnect.h"
#include "nsUTF8Utils.h"
#include "WorkerPrivate.h"
#include "WorkerRunnable.h"
#include "WrapperFactory.h"
#include "xpcprivate.h"
#include "XrayWrapper.h"
#include "nsPrintfCString.h"
#include "mozilla/Sprintf.h"
#include "nsGlobalWindow.h"
#include "mozilla/dom/ScriptSettings.h"
#include "mozilla/dom/CustomElementRegistry.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/HTMLElementBinding.h"
#include "mozilla/dom/HTMLEmbedElementBinding.h"
#include "mozilla/dom/HTMLAppletElementBinding.h"
#include "mozilla/dom/Promise.h"
#include "mozilla/dom/ResolveSystemBinding.h"
#include "mozilla/dom/WebIDLGlobalNameHash.h"
#include "mozilla/dom/WorkerPrivate.h"
#include "mozilla/dom/WorkerScope.h"
#include "mozilla/dom/XrayExpandoClass.h"
#include "mozilla/jsipc/CrossProcessObjectWrappers.h"
#include "nsDOMClassInfo.h"
#include "ipc/ErrorIPCUtils.h"
namespace mozilla {
namespace dom {
using namespace workers;
// Forward declare GetConstructorObject methods.
#define HTML_TAG(_tag, _classname, _interfacename) \
namespace HTML##_interfacename##ElementBinding { \
JSObject* GetConstructorObject(JSContext*); \
}
#define HTML_OTHER(_tag)
#include "nsHTMLTagList.h"
#undef HTML_TAG
#undef HTML_OTHER
typedef JSObject* (*constructorGetterCallback)(JSContext*);
// Mapping of html tag and GetConstructorObject methods.
#define HTML_TAG(_tag, _classname, _interfacename) HTML##_interfacename##ElementBinding::GetConstructorObject,
#define HTML_OTHER(_tag) nullptr,
// We use eHTMLTag_foo (where foo is the tag) which is defined in nsHTMLTags.h
// to index into this array.
static const constructorGetterCallback sConstructorGetterCallback[] = {
HTMLUnknownElementBinding::GetConstructorObject,
#include "nsHTMLTagList.h"
#undef HTML_TAG
#undef HTML_OTHER
};
const JSErrorFormatString ErrorFormatString[] = {
#define MSG_DEF(_name, _argc, _exn, _str) \
{ #_name, _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;
}
void
binding_detail::ThrowErrorMessage(JSContext* aCx, const unsigned aErrorNumber, ...)
{
va_list ap;
va_start(ap, aErrorNumber);
JS_ReportErrorNumberUTF8VA(aCx, GetErrorMessage, nullptr, aErrorNumber, ap);
va_end(ap);
}
bool
ThrowInvalidThis(JSContext* aCx, const JS::CallArgs& aArgs,
bool aSecurityError, 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;
}
const ErrNum errorNumber = aSecurityError ?
MSG_METHOD_THIS_UNWRAPPING_DENIED :
MSG_METHOD_THIS_DOES_NOT_IMPLEMENT_INTERFACE;
MOZ_RELEASE_ASSERT(GetErrorArgCount(errorNumber) <= 2);
JS_ReportErrorNumberUC(aCx, GetErrorMessage, nullptr,
static_cast<unsigned>(errorNumber),
funcNameStr.get(), ifaceName.get());
return false;
}
bool
ThrowInvalidThis(JSContext* aCx, const JS::CallArgs& aArgs,
bool aSecurityError,
prototypes::ID aProtoId)
{
return ThrowInvalidThis(aCx, aArgs, aSecurityError,
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
namespace binding_danger {
template<typename CleanupPolicy>
struct TErrorResult<CleanupPolicy>::Message {
Message() { MOZ_COUNT_CTOR(TErrorResult::Message); }
~Message() { MOZ_COUNT_DTOR(TErrorResult::Message); }
nsTArray<nsString> mArgs;
dom::ErrNum mErrorNumber;
bool HasCorrectNumberOfArguments()
{
return GetErrorArgCount(mErrorNumber) == mArgs.Length();
}
};
template<typename CleanupPolicy>
nsTArray<nsString>&
TErrorResult<CleanupPolicy>::CreateErrorMessageHelper(const dom::ErrNum errorNumber,
nsresult errorType)
{
AssertInOwningThread();
mResult = errorType;
mMessage = new Message();
mMessage->mErrorNumber = errorNumber;
return mMessage->mArgs;
}
template<typename CleanupPolicy>
void
TErrorResult<CleanupPolicy>::SerializeMessage(IPC::Message* aMsg) const
{
using namespace IPC;
AssertInOwningThread();
MOZ_ASSERT(mUnionState == HasMessage);
MOZ_ASSERT(mMessage);
WriteParam(aMsg, mMessage->mArgs);
WriteParam(aMsg, mMessage->mErrorNumber);
}
template<typename CleanupPolicy>
bool
TErrorResult<CleanupPolicy>::DeserializeMessage(const IPC::Message* aMsg,
PickleIterator* aIter)
{
using namespace IPC;
AssertInOwningThread();
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;
}
template<typename CleanupPolicy>
void
TErrorResult<CleanupPolicy>::SetPendingExceptionWithMessage(JSContext* aCx)
{
AssertInOwningThread();
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<unsigned>(message->mErrorNumber),
argCount > 0 ? args : nullptr);
ClearMessage();
mResult = NS_OK;
}
template<typename CleanupPolicy>
void
TErrorResult<CleanupPolicy>::ClearMessage()
{
AssertInOwningThread();
MOZ_ASSERT(IsErrorWithMessage());
delete mMessage;
mMessage = nullptr;
#ifdef DEBUG
mUnionState = HasNothing;
#endif // DEBUG
}
template<typename CleanupPolicy>
void
TErrorResult<CleanupPolicy>::ThrowJSException(JSContext* cx, JS::Handle<JS::Value> exn)
{
AssertInOwningThread();
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.asValueRef().setUndefined();
if (!js::AddRawValueRoot(cx, &mJSException.asValueRef(), "TErrorResult::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
}
}
template<typename CleanupPolicy>
void
TErrorResult<CleanupPolicy>::SetPendingJSException(JSContext* cx)
{
AssertInOwningThread();
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.asValueRef());
mResult = NS_OK;
#ifdef DEBUG
mUnionState = HasNothing;
#endif // DEBUG
}
template<typename CleanupPolicy>
struct TErrorResult<CleanupPolicy>::DOMExceptionInfo {
DOMExceptionInfo(nsresult rv, const nsACString& message)
: mMessage(message)
, mRv(rv)
{}
nsCString mMessage;
nsresult mRv;
};
template<typename CleanupPolicy>
void
TErrorResult<CleanupPolicy>::SerializeDOMExceptionInfo(IPC::Message* aMsg) const
{
using namespace IPC;
AssertInOwningThread();
MOZ_ASSERT(mDOMExceptionInfo);
MOZ_ASSERT(mUnionState == HasDOMExceptionInfo);
WriteParam(aMsg, mDOMExceptionInfo->mMessage);
WriteParam(aMsg, mDOMExceptionInfo->mRv);
}
template<typename CleanupPolicy>
bool
TErrorResult<CleanupPolicy>::DeserializeDOMExceptionInfo(const IPC::Message* aMsg,
PickleIterator* aIter)
{
using namespace IPC;
AssertInOwningThread();
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;
}
template<typename CleanupPolicy>
void
TErrorResult<CleanupPolicy>::ThrowDOMException(nsresult rv,
const nsACString& message)
{
AssertInOwningThread();
ClearUnionData();
mResult = NS_ERROR_DOM_DOMEXCEPTION;
mDOMExceptionInfo = new DOMExceptionInfo(rv, message);
#ifdef DEBUG
mUnionState = HasDOMExceptionInfo;
#endif
}
template<typename CleanupPolicy>
void
TErrorResult<CleanupPolicy>::SetPendingDOMException(JSContext* cx)
{
AssertInOwningThread();
MOZ_ASSERT(mDOMExceptionInfo,
"SetPendingDOMException() can be called only once");
MOZ_ASSERT(mUnionState == HasDOMExceptionInfo);
dom::Throw(cx, mDOMExceptionInfo->mRv, mDOMExceptionInfo->mMessage);
ClearDOMExceptionInfo();
mResult = NS_OK;
}
template<typename CleanupPolicy>
void
TErrorResult<CleanupPolicy>::ClearDOMExceptionInfo()
{
AssertInOwningThread();
MOZ_ASSERT(IsDOMException());
MOZ_ASSERT(mUnionState == HasDOMExceptionInfo || !mDOMExceptionInfo);
delete mDOMExceptionInfo;
mDOMExceptionInfo = nullptr;
#ifdef DEBUG
mUnionState = HasNothing;
#endif // DEBUG
}
template<typename CleanupPolicy>
void
TErrorResult<CleanupPolicy>::ClearUnionData()
{
AssertInOwningThread();
if (IsJSException()) {
JSContext* cx = dom::danger::GetJSContext();
MOZ_ASSERT(cx);
mJSException.asValueRef().setUndefined();
js::RemoveRawValueRoot(cx, &mJSException.asValueRef());
#ifdef DEBUG
mUnionState = HasNothing;
#endif // DEBUG
} else if (IsErrorWithMessage()) {
ClearMessage();
} else if (IsDOMException()) {
ClearDOMExceptionInfo();
}
}
template<typename CleanupPolicy>
void
TErrorResult<CleanupPolicy>::SetPendingGenericErrorException(JSContext* cx)
{
AssertInOwningThread();
MOZ_ASSERT(!IsErrorWithMessage());
MOZ_ASSERT(!IsJSException());
MOZ_ASSERT(!IsDOMException());
dom::Throw(cx, ErrorCode());
mResult = NS_OK;
}
template<typename CleanupPolicy>
TErrorResult<CleanupPolicy>&
TErrorResult<CleanupPolicy>::operator=(TErrorResult<CleanupPolicy>&& aRHS)
{
AssertInOwningThread();
aRHS.AssertInOwningThread();
// 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 = dom::danger::GetJSContext();
MOZ_ASSERT(cx);
mJSException.asValueRef().setUndefined();
if (!js::AddRawValueRoot(cx, &mJSException.asValueRef(), "TErrorResult::mJSException")) {
MOZ_CRASH("Could not root mJSException, we're about to OOM");
}
mJSException = aRHS.mJSException;
aRHS.mJSException.asValueRef().setUndefined();
js::RemoveRawValueRoot(cx, &aRHS.mJSException.asValueRef());
} 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;
}
template<typename CleanupPolicy>
void
TErrorResult<CleanupPolicy>::CloneTo(TErrorResult& aRv) const
{
AssertInOwningThread();
aRv.AssertInOwningThread();
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 = dom::danger::GetJSContext();
JS::Rooted<JS::Value> exception(cx, mJSException.asValueRef());
aRv.ThrowJSException(cx, exception);
}
}
template<typename CleanupPolicy>
void
TErrorResult<CleanupPolicy>::SuppressException()
{
AssertInOwningThread();
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;
}
template<typename CleanupPolicy>
void
TErrorResult<CleanupPolicy>::SetPendingException(JSContext* cx)
{
AssertInOwningThread();
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.
MOZ_ASSERT(JS_IsExceptionPending(cx));
mResult = NS_OK;
return;
}
if (IsErrorWithMessage()) {
SetPendingExceptionWithMessage(cx);
return;
}
if (IsJSException()) {
SetPendingJSException(cx);
return;
}
if (IsDOMException()) {
SetPendingDOMException(cx);
return;
}
SetPendingGenericErrorException(cx);
}
template<typename CleanupPolicy>
void
TErrorResult<CleanupPolicy>::StealExceptionFromJSContext(JSContext* cx)
{
AssertInOwningThread();
MOZ_ASSERT(mMightHaveUnreportedJSException,
"Why didn't you tell us you planned to throw a JS exception?");
JS::Rooted<JS::Value> exn(cx);
if (!JS_GetPendingException(cx, &exn)) {
ThrowUncatchableException();
return;
}
ThrowJSException(cx, exn);
JS_ClearPendingException(cx);
}
template<typename CleanupPolicy>
void
TErrorResult<CleanupPolicy>::NoteJSContextException(JSContext* aCx)
{
AssertInOwningThread();
if (JS_IsExceptionPending(aCx)) {
mResult = NS_ERROR_DOM_EXCEPTION_ON_JSCONTEXT;
} else {
mResult = NS_ERROR_UNCATCHABLE_EXCEPTION;
}
}
template class TErrorResult<JustAssertCleanupPolicy>;
template class TErrorResult<AssertAndSuppressCleanupPolicy>;
template class TErrorResult<JustSuppressCleanupPolicy>;
} // namespace binding_danger
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,
bool /* isToSource */)
{
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,
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);
MOZ_ASSERT(constructorProto);
MOZ_ASSERT(constructorClass);
constructor = JS_NewObjectWithGivenProto(cx, Jsvalify(constructorClass),
constructorProto);
if (!constructor) {
return nullptr;
}
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 (DOMIfaceAndProtoJSClass::FromJSClass(constructorClass)->wantsInterfaceHasInstance) {
JS::Rooted<jsid> hasInstanceId(cx,
SYMBOL_TO_JSID(JS::GetWellKnownSymbol(cx, JS::SymbolCode::hasInstance)));
if (!JS_DefineFunctionById(cx, constructor, hasInstanceId,
InterfaceHasInstance, 1,
// Flags match those of Function[Symbol.hasInstance]
JSPROP_READONLY | JSPROP_PERMANENT)) {
return nullptr;
}
}
if (properties) {
if (properties->HasStaticMethods() &&
!DefinePrefable(cx, constructor, properties->StaticMethods())) {
return nullptr;
}
if (properties->HasStaticAttributes() &&
!DefinePrefable(cx, constructor, properties->StaticAttributes())) {
return nullptr;
}
if (properties->HasConstants() &&
!DefinePrefable(cx, constructor, properties->Constants())) {
return nullptr;
}
}
if (chromeOnlyProperties) {
if (chromeOnlyProperties->HasStaticMethods() &&
!DefinePrefable(cx, constructor,
chromeOnlyProperties->StaticMethods())) {
return nullptr;
}
if (chromeOnlyProperties->HasStaticAttributes() &&
!DefinePrefable(cx, constructor,
chromeOnlyProperties->StaticAttributes())) {
return nullptr;
}
if (chromeOnlyProperties->HasConstants() &&
!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;
}
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,
bool isGlobal)
{
JS::Rooted<JSObject*> ourProto(cx,
JS_NewObjectWithUniqueType(cx, Jsvalify(protoClass), parentProto));
if (!ourProto ||
// We don't try to define properties on the global's prototype; those
// properties go on the global itself.
(!isGlobal &&
!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->HasMethods() &&
!DefinePrefable(cx, obj, properties->Methods())) {
return false;
}
if (properties->HasAttributes() &&
!DefinePrefable(cx, obj, properties->Attributes())) {
return false;
}
if (properties->HasConstants() &&
!DefinePrefable(cx, obj, properties->Constants())) {
return false;
}
}
if (chromeOnlyProperties) {
if (chromeOnlyProperties->HasMethods() &&
!DefinePrefable(cx, obj, chromeOnlyProperties->Methods())) {
return false;
}
if (chromeOnlyProperties->HasAttributes() &&
!DefinePrefable(cx, obj, chromeOnlyProperties->Attributes())) {
return false;
}
if (chromeOnlyProperties->HasConstants() &&
!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,
unsigned ctorNargs, const NamedConstructor* namedConstructors,
JS::Heap<JSObject*>* constructorCache,
const NativeProperties* properties,
const NativeProperties* chromeOnlyProperties,
const char* name, bool defineOnGlobal,
const char* const* unscopableNames,
bool isGlobal)
{
MOZ_ASSERT(protoClass || constructorClass,
"Need at least one class!");
MOZ_ASSERT(!((properties &&
(properties->HasMethods() || properties->HasAttributes())) ||
(chromeOnlyProperties &&
(chromeOnlyProperties->HasMethods() ||
chromeOnlyProperties->HasAttributes()))) || protoClass,
"Methods or properties but no protoClass!");
MOZ_ASSERT(!((properties &&
(properties->HasStaticMethods() ||
properties->HasStaticAttributes())) ||
(chromeOnlyProperties &&
(chromeOnlyProperties->HasStaticMethods() ||
chromeOnlyProperties->HasStaticAttributes()))) ||
constructorClass,
"Static methods but no constructorClass!");
MOZ_ASSERT(bool(name) == bool(constructorClass),
"Must have name precisely when we have an interface object");
MOZ_ASSERT(!protoClass == !protoCache,
"If, and only if, there is an interface prototype object we need "
"to cache it");
MOZ_ASSERT(bool(constructorClass) == bool(constructorCache),
"If, and only if, there is an interface object we need to cache "
"it");
MOZ_ASSERT(constructorProto || !constructorClass,
"Must have a constructor proto if we plan to create a constructor "
"object");
JS::Rooted<JSObject*> proto(cx);
if (protoClass) {
proto =
CreateInterfacePrototypeObject(cx, global, protoProto, protoClass,
properties, chromeOnlyProperties,
unscopableNames, isGlobal);
if (!proto) {
return;
}
*protoCache = proto;
}
else {
MOZ_ASSERT(!proto);
}
JSObject* interface;
if (constructorClass) {
interface = CreateInterfaceObject(cx, global, constructorProto,
constructorClass, 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,
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_ReportErrorASCII(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
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;
if (JSID_IS_STRING(id)) {
fun = js::NewFunctionByIdWithReserved(cx, native.op, nargs, 0, id);
} else {
// Can't pass this id (probably a symbol) to NewFunctionByIdWithReserved;
// just use an empty name for lack of anything better.
fun = js::NewFunctionWithReserved(cx, native.op, nargs, 0, nullptr);
}
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,
const jsid* attributeIds,
const JSPropertySpec* attributeSpecs,
JS::MutableHandle<JS::PropertyDescriptor> 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.accessors.getter.native, 0, id));
if (!funobj)
return false;
desc.setGetterObject(funobj);
desc.attributesRef() |= JSPROP_GETTER;
if (attrSpec.accessors.setter.native.op) {
// We have a setter! Make it.
funobj =
XrayCreateFunction(cx, wrapper, attrSpec.accessors.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,
const jsid* methodIds,
const JSFunctionSpec* methodSpecs,
JS::MutableHandle<JS::PropertyDescriptor> 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<JS::PropertyDescriptor> desc,
bool& cacheOnHolder,
const NativeProperties* nativeProperties)
{
if (!nativeProperties) {
return true;
}
if (nativeProperties->HasUnforgeableAttributes()) {
if (!XrayResolveAttribute(cx, wrapper, obj, id,
nativeProperties->UnforgeableAttributes(),
nativeProperties->UnforgeableAttributeIds(),
nativeProperties->UnforgeableAttributeSpecs(),
desc, cacheOnHolder)) {
return false;
}
if (desc.object()) {
return true;
}
}
if (nativeProperties->HasUnforgeableMethods()) {
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<JS::PropertyDescriptor> desc,
bool& cacheOnHolder, DOMObjectType type,
const NativeProperties* nativeProperties)
{
bool hasMethods = false;
if (type == eInterface) {
hasMethods = nativeProperties->HasStaticMethods();
} else {
hasMethods = nativeProperties->HasMethods();
}
if (hasMethods) {
const Prefable<const JSFunctionSpec>* methods;
const 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();
}
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->HasStaticAttributes()) {
if (!XrayResolveAttribute(cx, wrapper, obj, id,
nativeProperties->StaticAttributes(),
nativeProperties->StaticAttributeIds(),
nativeProperties->StaticAttributeSpecs(),
desc, cacheOnHolder)) {
return false;
}
if (desc.object()) {
return true;
}
}
} else {
if (nativeProperties->HasAttributes()) {
if (!XrayResolveAttribute(cx, wrapper, obj, id,
nativeProperties->Attributes(),
nativeProperties->AttributeIds(),
nativeProperties->AttributeSpecs(),
desc, cacheOnHolder)) {
return false;
}
if (desc.object()) {
return true;
}
}
}
if (nativeProperties->HasConstants()) {
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<JS::PropertyDescriptor> 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, JS::PropertyDescriptor *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<JS::PropertyDescriptor> 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.
JS::Rooted<JSObject*> maybeElement(cx, obj);
Element* element;
if (xpc::ObjectScope(wrapper)->IsContentXBLScope() &&
NS_SUCCEEDED(UNWRAP_OBJECT(Element, &maybeElement, 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);
}
if (id == SYMBOL_TO_JSID(JS::GetWellKnownSymbol(cx, JS::SymbolCode::hasInstance)) &&
DOMIfaceAndProtoJSClass::FromJSClass(js::GetObjectClass(obj))->
wantsInterfaceHasInstance) {
cacheOnHolder = true;
JSNativeWrapper interfaceHasInstanceWrapper = { InterfaceHasInstance,
nullptr };
JSObject* funObj = XrayCreateFunction(cx, wrapper,
interfaceHasInstanceWrapper, 1, id);
if (!funObj) {
return false;
}
desc.value().setObject(*funObj);
desc.setAttributes(JSPROP_READONLY | JSPROP_PERMANENT);
desc.object().set(wrapper);
desc.setSetter(nullptr);
desc.setGetter(nullptr);
return true;
}
} 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<JS::PropertyDescriptor> 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,
const 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->Has##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->HasConstants()) {
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);
}
const JSClass*
XrayGetExpandoClass(JSContext* cx, JS::Handle<JSObject*> obj)
{
DOMObjectType type;
const NativePropertyHooks* nativePropertyHooks =
GetNativePropertyHooks(cx, obj, type);
if (!IsInstance(type)) {
// Non-instances don't need any special expando classes.
return &DefaultXrayExpandoObjectClass;
}
return nativePropertyHooks->mXrayExpandoClass;
}
bool
XrayDeleteNamedProperty(JSContext* cx, JS::Handle<JSObject*> wrapper,
JS::Handle<JSObject*> obj, JS::Handle<jsid> id,
JS::ObjectOpResult& opresult)
{
DOMObjectType type;
const NativePropertyHooks* nativePropertyHooks =
GetNativePropertyHooks(cx, obj, type);
if (!IsInstance(type) || !nativePropertyHooks->mDeleteNamedProperty) {
return opresult.succeed();
}
return nativePropertyHooks->mDeleteNamedProperty(cx, wrapper, obj, id,
opresult);
}
JSObject*
GetCachedSlotStorageObjectSlow(JSContext* cx, JS::Handle<JSObject*> obj,
bool* isXray)
{
if (!xpc::WrapperFactory::IsXrayWrapper(obj)) {
JSObject* retval = js::UncheckedUnwrap(obj, /* stopAtWindowProxy = */ false);
MOZ_ASSERT(IsDOMObject(retval));
*isXray = false;
return retval;
}
*isXray = true;
return xpc::EnsureXrayExpandoObject(cx, obj);;
}
DEFINE_XRAY_EXPANDO_CLASS(, DefaultXrayExpandoObjectClass, 0);
NativePropertyHooks sEmptyNativePropertyHooks = {
nullptr,
nullptr,
nullptr,
{
nullptr,
nullptr
},
prototypes::id::_ID_Count,
constructors::id::_ID_Count,
nullptr
};
const js::ClassOps sBoringInterfaceObjectClassClassOps = {
nullptr, /* addProperty */
nullptr, /* delProperty */
nullptr, /* getProperty */
nullptr, /* setProperty */
nullptr, /* enumerate */
nullptr, /* resolve */
nullptr, /* mayResolve */
nullptr, /* finalize */
ThrowingConstructor, /* call */
nullptr, /* hasInstance */
ThrowingConstructor, /* construct */
nullptr, /* trace */
};
const js::ObjectOps sInterfaceObjectClassObjectOps = {
nullptr, /* lookupProperty */
nullptr, /* defineProperty */
nullptr, /* hasProperty */
nullptr, /* getProperty */
nullptr, /* setProperty */
nullptr, /* getOwnPropertyDescriptor */
nullptr, /* deleteProperty */
nullptr, /* getElements */
nullptr, /* enumerate */
InterfaceObjectToString, /* funToString */
};
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::Handle<JSObject*> aObj,
nsAString& aJSON) const
{
return JS::ToJSONMaybeSafely(aCx, aObj, 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;
}
void
ReparentWrapper(JSContext* aCx, JS::Handle<JSObject*> aObjArg, ErrorResult& aError)
{
js::AssertSameCompartment(aCx, aObjArg);
aError.MightThrowJSException();
// 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.
// TODO: Make sure to retain 'onerror' if bug 1342439 lands.
JS_CHECK_RECURSION_CONSERVATIVE(aCx, aError.StealExceptionFromJSContext(aCx); return);
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->mGetAssociatedGlobal(aCx, aObj));
MOZ_ASSERT(JS_IsGlobalObject(newParent));
JSAutoCompartment oldAc(aCx, oldParent);
JSCompartment* oldCompartment = js::GetObjectCompartment(oldParent);
JSCompartment* newCompartment = js::GetObjectCompartment(newParent);
if (oldCompartment == newCompartment) {
MOZ_ASSERT(oldParent == newParent);
return;
}
nsISupports* native = UnwrapDOMObjectToISupports(aObj);
if (!native) {
return;
}
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);
if (!proto) {
aError.StealExceptionFromJSContext(aCx);
return;
}
JS::Rooted<JSObject*> newobj(aCx, JS_CloneObject(aCx, aObj, proto));
if (!newobj) {
aError.StealExceptionFromJSContext(aCx);
return;
}
JS::Rooted<JSObject*> propertyHolder(aCx);
JS::Rooted<JSObject*> copyFrom(aCx, isProxy ? expandoObject : aObj);
if (copyFrom) {
propertyHolder = JS_NewObjectWithGivenProto(aCx, nullptr, nullptr);
if (!propertyHolder) {
aError.StealExceptionFromJSContext(aCx);
return;
}
if (!JS_CopyPropertiesFrom(aCx, propertyHolder, copyFrom)) {
aError.StealExceptionFromJSContext(aCx);
return;
}
} 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)) {
aError.StealExceptionFromJSContext(aCx);
return;
}
// 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();
}
}
#ifdef MOZ_ENABLE_NPAPI
JS::Rooted<JSObject*> maybeObjLC(aCx, aObj);
nsObjectLoadingContent* htmlobject;
nsresult rv = UNWRAP_OBJECT(HTMLObjectElement, &maybeObjLC, htmlobject);
if (NS_FAILED(rv)) {
rv = UnwrapObject<prototypes::id::HTMLEmbedElement,
HTMLSharedObjectElement>(&maybeObjLC, htmlobject);
if (NS_FAILED(rv)) {
rv = UnwrapObject<prototypes::id::HTMLAppletElement,
HTMLSharedObjectElement>(&maybeObjLC, htmlobject);
if (NS_FAILED(rv)) {
htmlobject = nullptr;
}
}
}
if (htmlobject) {
htmlobject->SetupProtoChain(aCx, aObj);
}
#endif
}
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.
nsCOMPtr<nsISupports> supp = xpc::UnwrapReflectorToISupports(mGlobalJSObject);
if (supp) {
// See documentation for mGlobalJSObject for why this assignment is OK.
mGlobalObject = supp;
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;
}
nsIPrincipal*
GlobalObject::GetSubjectPrincipal() const
{
if (!NS_IsMainThread()) {
return nullptr;
}
JSCompartment* compartment = js::GetContextCompartment(mCx);
MOZ_ASSERT(compartment);
JSPrincipals* principals = JS_GetCompartmentPrincipals(compartment);
return nsJSPrincipals::get(principals);
}
static bool
CallOrdinaryHasInstance(JSContext* cx, JS::CallArgs& args)
{
JS::Rooted<JSObject*> thisObj(cx, &args.thisv().toObject());
bool isInstance;
if (!JS::OrdinaryHasInstance(cx, thisObj, args.get(0), &isInstance)) {
return false;
}
args.rval().setBoolean(isInstance);
return true;
}
bool
InterfaceHasInstance(JSContext* cx, unsigned argc, JS::Value* vp)
{
JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
// If the thing we were passed is not an object, return false like
// OrdinaryHasInstance does.
if (!args.get(0).isObject()) {
args.rval().setBoolean(false);
return true;
}
// If "this" is not an object, likewise return false (again, like
// OrdinaryHasInstance).
if (!args.thisv().isObject()) {
args.rval().setBoolean(false);
return true;
}
// If "this" doesn't have a DOMIfaceAndProtoJSClass, it's not a DOM
// constructor, so just fall back to OrdinaryHasInstance. But note that we
// should CheckedUnwrap here, because otherwise we won't get the right
// answers.
JS::Rooted<JSObject*> thisObj(cx, js::CheckedUnwrap(&args.thisv().toObject()));
if (!thisObj) {
// Just fall back on the normal thing, in case it still happens to work.
return CallOrdinaryHasInstance(cx, args);
}
const js::Class* thisClass = js::GetObjectClass(thisObj);
if (!IsDOMIfaceAndProtoClass(thisClass)) {
return CallOrdinaryHasInstance(cx, args);
}
const DOMIfaceAndProtoJSClass* clasp =
DOMIfaceAndProtoJSClass::FromJSClass(thisClass);
// If "this" isn't a DOM constructor or is a constructor for an interface
// without a prototype, just fall back to OrdinaryHasInstance.
if (clasp->mType != eInterface ||
clasp->mPrototypeID == prototypes::id::_ID_Count) {
return CallOrdinaryHasInstance(cx, args);
}
JS::Rooted<JSObject*> instance(cx, &args[0].toObject());
const DOMJSClass* domClass =
GetDOMClass(js::UncheckedUnwrap(instance, /* stopAtWindowProxy = */ false));
if (domClass &&
domClass->mInterfaceChain[clasp->mDepth] == clasp->mPrototypeID) {
args.rval().setBoolean(true);
return true;
}
if (jsipc::IsWrappedCPOW(instance)) {
bool boolp = false;
if (!jsipc::DOMInstanceOf(cx, js::UncheckedUnwrap(instance), clasp->mPrototypeID,
clasp->mDepth, &boolp)) {
return false;
}
args.rval().setBoolean(boolp);
return true;
}
return CallOrdinaryHasInstance(cx, args);
}
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<nsPIDOMWindowInner> 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(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(aContractId, global, aObject, aRv);
if (aRv.Failed()) {
return nullptr;
}
return global.forget();
}
void
ConstructJSImplementation(const char* aContractId,
nsIGlobalObject* aGlobal,
JS::MutableHandle<JSObject*> aObject,
ErrorResult& aRv)
{
MOZ_ASSERT(NS_IsMainThread());
// 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;
nsCOMPtr<nsPIDOMWindowInner> window = do_QueryInterface(aGlobal);
if (!window->IsCurrentInnerWindow()) {
aRv.Throw(NS_ERROR_FAILURE);
return;
}
// 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);
if (gpi) {
JS::Rooted<JS::Value> initReturn(RootingCx());
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(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(nsAString& aString)
{
NormalizeUSVStringInternal(aString);
}
void
NormalizeUSVString(binding_detail::FakeString& aString)
{
NormalizeUSVStringInternal(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");
SprintfLiteral(index, "%" PRIuSIZE, 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");
SprintfLiteral(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");
if (!result.SetLength(length, fallible)) {
return false;
}
JS_EncodeStringToBuffer(cx, s, result.BeginWriting(), length);
return true;
}
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
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 |
GlobalNames::WorkletGlobalScope)) == 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;
}
if ((aNonExposedGlobals & GlobalNames::WorkletGlobalScope) &&
!strcmp(name, "WorkletGlobalScope")) {
return true;
}
return false;
}
void
HandlePrerenderingViolation(nsPIDOMWindowInner* aWindow)
{
// Freeze the window and its workers, and its children too.
aWindow->Freeze();
// 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->AsInner());
// 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, false, protoID);
}
JS::Rooted<JSObject*> obj(cx, &args.thisv().toObject());
// NOTE: we want to leave obj in its initial compartment, so don't want to
// pass it to UnwrapObject.
JS::Rooted<JSObject*> rootSelf(cx, obj);
void* self;
{
binding_detail::MutableObjectHandleWrapper wrapper(&rootSelf);
nsresult rv = binding_detail::UnwrapObjectInternal<void, true>(wrapper,
self,
protoID,
info->depth);
if (NS_FAILED(rv)) {
return ThrowInvalidThis(cx, args,
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, false, protoID);
}
JS::Rooted<JSObject*> obj(cx, &args.thisv().toObject());
// NOTE: we want to leave obj in its initial compartment, so don't want to
// pass it to UnwrapObject.
JS::Rooted<JSObject*> rootSelf(cx, obj);
void* self;
{
binding_detail::MutableObjectHandleWrapper wrapper(&rootSelf);
nsresult rv = binding_detail::UnwrapObjectInternal<void, true>(wrapper,
self,
protoID,
info->depth);
if (NS_FAILED(rv)) {
return ThrowInvalidThis(cx, args,
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, false, protoID);
}
JS::Rooted<JSObject*> obj(cx, &args.thisv().toObject());
// NOTE: we want to leave obj in its initial compartment, so don't want to
// pass it to UnwrapObject.
JS::Rooted<JSObject*> rootSelf(cx, obj);
void* self;
{
binding_detail::MutableObjectHandleWrapper wrapper(&rootSelf);
nsresult rv = binding_detail::UnwrapObjectInternal<void, true>(wrapper,
self,
protoID,
info->depth);
if (NS_FAILED(rv)) {
return ThrowInvalidThis(cx, args,
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, false, protoID);
return ConvertExceptionToPromise(cx, xpc::XrayAwareCalleeGlobal(callee),
args.rval());
}
JS::Rooted<JSObject*> obj(cx, &args.thisv().toObject());
// NOTE: we want to leave obj in its initial compartment, so don't want to
// pass it to UnwrapObject.
JS::Rooted<JSObject*> rootSelf(cx, obj);
void* self;
{
binding_detail::MutableObjectHandleWrapper wrapper(&rootSelf);
nsresult rv = binding_detail::UnwrapObjectInternal<void, true>(wrapper,
self,
protoID,
info->depth);
if (NS_FAILED(rv)) {
ThrowInvalidThis(cx, args, 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)
{
{
JSAutoCompartment ac(cx, promiseScope);
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);
JSObject* promise = JS::CallOriginalPromiseReject(cx, exn);
if (!promise) {
// We just give up. Put the exception back.
JS_SetPendingException(cx, exn);
return false;
}
rval.setObject(*promise);
}
// Now make sure we rewrap promise back into the compartment we want
return JS_WrapValue(cx, 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;
}
// Register new DOM bindings
WebIDLGlobalNameHash::Init();
nsresult rv = nsDOMClassInfo::Init();
if (NS_FAILED(rv)) {
NS_ERROR("Could not initialize nsDOMClassInfo");
return rv;
}
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;
}
nsCOMPtr<nsISupports> iface = xpc::UnwrapReflectorToISupports(src);
if (iface) {
if (NS_FAILED(iface->QueryInterface(iid, ppArg))) {
return NS_ERROR_XPC_BAD_CONVERT_JS;
}
return NS_OK;
}
// Only allow XPCWrappedJS stuff in system code. Ideally we would remove this
// even there, but that involves converting some things to WebIDL callback
// interfaces and making some other things builtinclass...
if (!nsContentUtils::IsCallerChrome()) {
return NS_ERROR_XPC_BAD_CONVERT_JS;
}
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);
}
nsresult
UnwrapXPConnectImpl(JSContext* cx,
JS::MutableHandle<JS::Value> src,
const nsIID &iid,
void **ppArg)
{
if (!NS_IsMainThread()) {
return NS_ERROR_NOT_AVAILABLE;
}
MOZ_ASSERT(src.isObject());
// Unwrap ourselves, because we're going to want access to the unwrapped
// object.
JS::Rooted<JSObject*> obj(cx,
js::CheckedUnwrap(&src.toObject(),
/* stopAtWindowProxy = */ false));
if (!obj) {
return NS_ERROR_NOT_AVAILABLE;
}
nsCOMPtr<nsISupports> iface = xpc::UnwrapReflectorToISupports(obj);
if (!iface) {
return NS_ERROR_XPC_BAD_CONVERT_JS;
}
if (NS_FAILED(iface->QueryInterface(iid, ppArg))) {
return NS_ERROR_XPC_BAD_CONVERT_JS;
}
// Now update our source to keep rooting our object.
src.setObject(*obj);
return NS_OK;
}
nsresult
UnwrapWindowProxyImpl(JS::Handle<JSObject*> src,
nsPIDOMWindowOuter** ppArg)
{
nsCOMPtr<nsPIDOMWindowInner> inner;
nsresult rv = UnwrapArg<nsPIDOMWindowInner>(src, getter_AddRefs(inner));
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsPIDOMWindowOuter> outer = inner->GetOuterWindow();
outer.forget(ppArg);
return NS_OK;
}
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.
if (!newArgs.append(args.get(0))) {
return false;
}
if (!newArgs.append(args.get(1))) {
return false;
}
if (!newArgs.append(maplikeOrSetlikeObj)) {
return false;
}
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;
}
// https://html.spec.whatwg.org/multipage/dom.html#htmlconstructor
already_AddRefed<nsGenericHTMLElement>
CreateHTMLElement(const GlobalObject& aGlobal, const JS::CallArgs& aCallArgs,
JS::Handle<JSObject*> aGivenProto, ErrorResult& aRv)
{
// Step 1.
nsCOMPtr<nsPIDOMWindowInner> window = do_QueryInterface(aGlobal.GetAsSupports());
if (!window) {
aRv.Throw(NS_ERROR_UNEXPECTED);
return nullptr;
}
nsIDocument* doc = window->GetExtantDoc();
if (!doc) {
aRv.Throw(NS_ERROR_UNEXPECTED);
return nullptr;
}
RefPtr<mozilla::dom::CustomElementRegistry> registry(window->CustomElements());
if (!registry) {
aRv.Throw(NS_ERROR_UNEXPECTED);
return nullptr;
}
// Step 2 is in the code output by CGClassConstructor.
// Step 3.
JSContext* cx = aGlobal.Context();
JS::Rooted<JSObject*> newTarget(cx, &aCallArgs.newTarget().toObject());
CustomElementDefinition* definition =
registry->LookupCustomElementDefinition(cx, newTarget);
if (!definition) {
aRv.ThrowTypeError<MSG_ILLEGAL_CONSTRUCTOR>();
return nullptr;
}
// The callee might be an Xray. Unwrap it to get actual callee.
JS::Rooted<JSObject*> callee(cx, js::CheckedUnwrap(&aCallArgs.callee()));
if (!callee) {
aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
return nullptr;
}
// And the actual callee might be in different compartment, so enter its
// compartment before getting the standard constructor object to compare to,
// so we get it from the same global as callee itself.
JSAutoCompartment ac(cx, callee);
int32_t tag = eHTMLTag_userdefined;
if (!definition->IsCustomBuiltIn()) {
// Step 4.
// If the definition is for an autonomous custom element, the active
// function should be HTMLElement.
JS::Rooted<JSObject*> constructor(cx, HTMLElementBinding::GetConstructorObject(cx));
if (!constructor) {
aRv.NoteJSContextException(cx);
return nullptr;
}
if (callee != constructor) {
aRv.ThrowTypeError<MSG_ILLEGAL_CONSTRUCTOR>();
return nullptr;
}
} else {
// Step 5.
// If the definition is for a customized built-in element, the localName
// should be defined in the specification.
tag = nsHTMLTags::CaseSensitiveAtomTagToId(definition->mLocalName);
if (tag == eHTMLTag_userdefined) {
aRv.ThrowTypeError<MSG_ILLEGAL_CONSTRUCTOR>();
return nullptr;
}
MOZ_ASSERT(tag <= NS_HTML_TAG_MAX, "tag is out of bounds");
// If the definition is for a customized built-in element, the active
// function should be the localname's element interface.
constructorGetterCallback cb = sConstructorGetterCallback[tag];
if (!cb) {
aRv.ThrowTypeError<MSG_ILLEGAL_CONSTRUCTOR>();
return nullptr;
}
JS::Rooted<JSObject*> constructor(cx, cb(cx));
if (!constructor) {
aRv.NoteJSContextException(cx);
return nullptr;
}
if (callee != constructor) {
aRv.ThrowTypeError<MSG_ILLEGAL_CONSTRUCTOR>();
return nullptr;
}
}
RefPtr<mozilla::dom::NodeInfo> nodeInfo =
doc->NodeInfoManager()->GetNodeInfo(definition->mLocalName,
nullptr,
kNameSpaceID_XHTML,
nsIDOMNode::ELEMENT_NODE);
if (!nodeInfo) {
aRv.Throw(NS_ERROR_UNEXPECTED);
return nullptr;
}
// Step 6 and Step 7 are in the code output by CGClassConstructor.
// Step 8.
nsTArray<RefPtr<nsGenericHTMLElement>>& constructionStack =
definition->mConstructionStack;
if (constructionStack.IsEmpty()) {
RefPtr<nsGenericHTMLElement> newElement;
if (tag == eHTMLTag_userdefined) {
// Autonomous custom element.
newElement = NS_NewHTMLElement(nodeInfo.forget());
} else {
// Customized built-in element.
newElement = CreateHTMLElement(tag, nodeInfo.forget(), NOT_FROM_PARSER);
}
newElement->SetCustomElementData(
new CustomElementData(definition->mType, CustomElementData::State::eCustom));
newElement->SetCustomElementDefinition(definition);
return newElement.forget();
}
// Step 9.
RefPtr<nsGenericHTMLElement>& element = constructionStack.LastElement();
// Step 10.
if (element == ALEADY_CONSTRUCTED_MARKER) {
aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
return nullptr;
}
// Step 11.
// Do prototype swizzling for upgrading a custom element here, for cases when
// we have a reflector already. If we don't have one yet, our caller will
// create it with the right proto (by calling DoGetOrCreateDOMReflector with
// that proto).
JS::Rooted<JSObject*> reflector(cx, element->GetWrapper());
if (reflector) {
// reflector might be in different compartment.
JSAutoCompartment ac(cx, reflector);
JS::Rooted<JSObject*> givenProto(cx, aGivenProto);
if (!JS_WrapObject(cx, &givenProto) ||
!JS_SetPrototype(cx, reflector, givenProto)) {
aRv.NoteJSContextException(cx);
return nullptr;
}
}
// Step 12 and Step 13.
return element.forget();
}
#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
namespace {
// This runnable is used to write a deprecation message from a worker to the
// console running on the main-thread.
class DeprecationWarningRunnable final : public WorkerProxyToMainThreadRunnable
{
nsIDocument::DeprecatedOperations mOperation;
public:
DeprecationWarningRunnable(WorkerPrivate* aWorkerPrivate,
nsIDocument::DeprecatedOperations aOperation)
: WorkerProxyToMainThreadRunnable(aWorkerPrivate)
, mOperation(aOperation)
{
MOZ_ASSERT(aWorkerPrivate);
aWorkerPrivate->AssertIsOnWorkerThread();
}
private:
void
RunOnMainThread() override
{
MOZ_ASSERT(NS_IsMainThread());
// Walk up to our containing page
WorkerPrivate* wp = mWorkerPrivate;
while (wp->GetParent()) {
wp = wp->GetParent();
}
nsPIDOMWindowInner* window = wp->GetWindow();
if (window && window->GetExtantDoc()) {
window->GetExtantDoc()->WarnOnceAbout(mOperation);
}
}
void
RunBackOnWorkerThread() override
{}
};
} // anonymous namespace
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;
}
if (NS_IsMainThread()) {
nsCOMPtr<nsPIDOMWindowInner> window = do_QueryInterface(global.GetAsSupports());
if (window && window->GetExtantDoc()) {
window->GetExtantDoc()->WarnOnceAbout(aOperation);
}
return;
}
WorkerPrivate* workerPrivate = GetWorkerPrivateFromContext(aCx);
if (!workerPrivate) {
return;
}
RefPtr<DeprecationWarningRunnable> runnable =
new DeprecationWarningRunnable(workerPrivate, aOperation);
runnable->Dispatch();
}
namespace binding_detail {
JSObject*
UnprivilegedJunkScopeOrWorkerGlobal()
{
if (NS_IsMainThread()) {
return xpc::UnprivilegedJunkScope();
}
return GetCurrentThreadWorkerGlobal();
}
} // namespace binding_detail
} // namespace dom
} // namespace mozilla
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