mozilla-central/dom/bindings/BindingUtils.cpp (file symbol)

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "BindingUtils.h"
#include <algorithm>
#include <cstdint>
#include <stdarg.h>
#include "mozilla/Assertions.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/Encoding.h"
#include "mozilla/FloatingPoint.h"
#include "mozilla/Preferences.h"
#include "mozilla/ScopeExit.h"
#include "mozilla/StaticPrefs_dom.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/Unused.h"
#include "mozilla/UseCounter.h"
#include "AccessCheck.h"
#include "js/CallAndConstruct.h" // JS::Call, JS::IsCallable
#include "js/experimental/JitInfo.h" // JSJit{Getter,Setter,Method}CallArgs, JSJit{Getter,Setter}Op, JSJitInfo
#include "js/friend/StackLimits.h" // js::AutoCheckRecursionLimit
#include "js/Id.h"
#include "js/JSON.h"
#include "js/MapAndSet.h"
#include "js/Object.h" // JS::GetClass, JS::GetCompartment, JS::GetReservedSlot, JS::SetReservedSlot
#include "js/PropertyAndElement.h" // JS_AlreadyHasOwnPropertyById, JS_DefineFunction, JS_DefineFunctionById, JS_DefineFunctions, JS_DefineProperties, JS_DefineProperty, JS_DefinePropertyById, JS_ForwardGetPropertyTo, JS_GetProperty, JS_HasProperty, JS_HasPropertyById
#include "js/StableStringChars.h"
#include "js/String.h" // JS::GetStringLength, JS::MaxStringLength, JS::StringHasLatin1Chars
#include "js/Symbol.h"
#include "jsfriendapi.h"
#include "nsContentCreatorFunctions.h"
#include "nsContentUtils.h"
#include "nsGlobalWindowInner.h"
#include "nsHTMLTags.h"
#include "nsIDOMGlobalPropertyInitializer.h"
#include "nsINode.h"
#include "nsIOService.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 "nsReadableUtils.h"
#include "nsWrapperCacheInlines.h"
#include "mozilla/dom/ScriptSettings.h"
#include "mozilla/dom/CustomElementRegistry.h"
#include "mozilla/dom/DeprecationReportBody.h"
#include "mozilla/dom/DOMException.h"
#include "mozilla/dom/ElementBinding.h"
#include "mozilla/dom/Exceptions.h"
#include "mozilla/dom/HTMLObjectElement.h"
#include "mozilla/dom/HTMLObjectElementBinding.h"
#include "mozilla/dom/HTMLEmbedElement.h"
#include "mozilla/dom/HTMLElementBinding.h"
#include "mozilla/dom/HTMLEmbedElementBinding.h"
#include "mozilla/dom/MaybeCrossOriginObject.h"
#include "mozilla/dom/ObservableArrayProxyHandler.h"
#include "mozilla/dom/ReportingUtils.h"
#include "mozilla/dom/XULElementBinding.h"
#include "mozilla/dom/XULFrameElementBinding.h"
#include "mozilla/dom/XULMenuElementBinding.h"
#include "mozilla/dom/XULPopupElementBinding.h"
#include "mozilla/dom/XULResizerElementBinding.h"
#include "mozilla/dom/XULTextElementBinding.h"
#include "mozilla/dom/XULTreeElementBinding.h"
#include "mozilla/dom/Promise.h"
#include "mozilla/dom/WebIDLGlobalNameHash.h"
#include "mozilla/dom/WorkerPrivate.h"
#include "mozilla/dom/WorkerScope.h"
#include "mozilla/dom/XrayExpandoClass.h"
#include "mozilla/dom/WindowProxyHolder.h"
#include "ipc/ErrorIPCUtils.h"
#include "ipc/IPCMessageUtilsSpecializations.h"
#include "mozilla/dom/DocGroup.h"
#include "nsXULElement.h"
namespace mozilla {
namespace dom {
// Forward declare GetConstructorObjectHandle methods.
#define HTML_TAG(_tag, _classname, _interfacename) \
namespace HTML##_interfacename##Element_Binding { \
JS::Handle<JSObject*> GetConstructorObjectHandle(JSContext*); \
}
#define HTML_OTHER(_tag)
#include "nsHTMLTagList.h"
#undef HTML_TAG
#undef HTML_OTHER
using constructorGetterCallback = JS::Handle<JSObject*> (*)(JSContext*);
// Mapping of html tag and GetConstructorObjectHandle methods.
#define HTML_TAG(_tag, _classname, _interfacename) \
HTML##_interfacename##Element_Binding::GetConstructorObjectHandle,
#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[] = {
HTMLUnknownElement_Binding::GetConstructorObjectHandle,
#include "nsHTMLTagList.h"
#undef HTML_TAG
#undef HTML_OTHER
};
static const JSErrorFormatString ErrorFormatString[] = {
#define MSG_DEF(_name, _argc, _has_context, _exn, _str) \
{#_name, _str, _argc, _exn},
#include "mozilla/dom/Errors.msg"
#undef MSG_DEF
};
#define MSG_DEF(_name, _argc, _has_context, _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
static const JSErrorFormatString* GetErrorMessage(void* aUserRef,
const unsigned aErrorNumber) {
MOZ_ASSERT(aErrorNumber < std::size(ErrorFormatString));
return &ErrorFormatString[aErrorNumber];
}
uint16_t GetErrorArgCount(const ErrNum aErrorNumber) {
return GetErrorMessage(nullptr, aErrorNumber)->argCount;
}
// aErrorNumber needs to be unsigned, not an ErrNum, because the latter makes
// va_start have undefined behavior, and we do not want undefined behavior.
void binding_detail::ThrowErrorMessage(JSContext* aCx,
const unsigned aErrorNumber, ...) {
va_list ap;
va_start(ap, aErrorNumber);
if (!ErrorFormatHasContext[aErrorNumber]) {
JS_ReportErrorNumberUTF8VA(aCx, GetErrorMessage, nullptr, aErrorNumber, ap);
va_end(ap);
return;
}
// Our first arg is the context arg. We want to replace nullptr with empty
// string, leave empty string alone, and for anything else append ": " to the
// end. See also the behavior of
// TErrorResult::SetPendingExceptionWithMessage, which this is mirroring for
// exceptions that are thrown directly, not via an ErrorResult.
const char* args[JS::MaxNumErrorArguments + 1];
size_t argCount = GetErrorArgCount(static_cast<ErrNum>(aErrorNumber));
MOZ_ASSERT(argCount > 0, "We have a context arg!");
nsAutoCString firstArg;
for (size_t i = 0; i < argCount; ++i) {
args[i] = va_arg(ap, const char*);
if (i == 0) {
if (args[0] && *args[0]) {
firstArg.Append(args[0]);
firstArg.AppendLiteral(": ");
}
args[0] = firstArg.get();
}
}
JS_ReportErrorNumberUTF8Array(aCx, GetErrorMessage, nullptr, aErrorNumber,
args);
va_end(ap);
}
static 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);
if (!JS_GetFunctionDisplayId(aCx, func, &funcName)) {
return false;
}
MOZ_ASSERT(funcName);
nsAutoJSString funcNameStr;
if (!funcNameStr.init(aCx, funcName)) {
return false;
}
if (aSecurityError) {
return Throw(aCx, NS_ERROR_DOM_SECURITY_ERR,
nsPrintfCString("Permission to call '%s' denied.",
NS_ConvertUTF16toUTF8(funcNameStr).get()));
}
const ErrNum errorNumber = MSG_METHOD_THIS_DOES_NOT_IMPLEMENT_INTERFACE;
MOZ_RELEASE_ASSERT(GetErrorArgCount(errorNumber) == 2);
JS_ReportErrorNumberUC(aCx, GetErrorMessage, nullptr,
static_cast<unsigned>(errorNumber),
static_cast<const char16_t*>(funcNameStr.get()),
static_cast<const char16_t*>(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, const JS::CallArgs& aArgs,
prototypes::ID aProtoId) {
nsPrintfCString errorMessage("%s attribute setter",
NamesOfInterfacesWithProtos(aProtoId));
return aArgs.requireAtLeast(aCx, errorMessage.get(), 1);
}
} // namespace dom
namespace binding_danger {
template <typename CleanupPolicy>
struct TErrorResult<CleanupPolicy>::Message {
Message() : mErrorNumber(dom::Err_Limit) {
MOZ_COUNT_CTOR(TErrorResult::Message);
}
~Message() { MOZ_COUNT_DTOR(TErrorResult::Message); }
// UTF-8 strings (probably ASCII in most cases) in mArgs.
nsTArray<nsCString> mArgs;
dom::ErrNum mErrorNumber;
bool HasCorrectNumberOfArguments() {
return GetErrorArgCount(mErrorNumber) == mArgs.Length();
}
bool operator==(const TErrorResult<CleanupPolicy>::Message& aRight) const {
return mErrorNumber == aRight.mErrorNumber && mArgs == aRight.mArgs;
}
};
template <typename CleanupPolicy>
nsTArray<nsCString>& TErrorResult<CleanupPolicy>::CreateErrorMessageHelper(
const dom::ErrNum errorNumber, nsresult errorType) {
AssertInOwningThread();
mResult = errorType;
Message* message = InitMessage(new Message());
message->mErrorNumber = errorNumber;
return message->mArgs;
}
template <typename CleanupPolicy>
void TErrorResult<CleanupPolicy>::SerializeMessage(
IPC::MessageWriter* aWriter) const {
using namespace IPC;
AssertInOwningThread();
MOZ_ASSERT(mUnionState == HasMessage);
MOZ_ASSERT(mExtra.mMessage);
WriteParam(aWriter, mExtra.mMessage->mArgs);
WriteParam(aWriter, mExtra.mMessage->mErrorNumber);
}
template <typename CleanupPolicy>
bool TErrorResult<CleanupPolicy>::DeserializeMessage(
IPC::MessageReader* aReader) {
using namespace IPC;
AssertInOwningThread();
auto readMessage = MakeUnique<Message>();
if (!ReadParam(aReader, &readMessage->mArgs) ||
!ReadParam(aReader, &readMessage->mErrorNumber)) {
return false;
}
if (!readMessage->HasCorrectNumberOfArguments()) {
return false;
}
MOZ_ASSERT(mUnionState == HasNothing);
InitMessage(readMessage.release());
#ifdef DEBUG
mUnionState = HasMessage;
#endif // DEBUG
return true;
}
template <typename CleanupPolicy>
void TErrorResult<CleanupPolicy>::SetPendingExceptionWithMessage(
JSContext* aCx, const char* context) {
AssertInOwningThread();
MOZ_ASSERT(mUnionState == HasMessage);
MOZ_ASSERT(mExtra.mMessage,
"SetPendingExceptionWithMessage() can be called only once");
Message* message = mExtra.mMessage;
MOZ_RELEASE_ASSERT(message->HasCorrectNumberOfArguments());
if (dom::ErrorFormatHasContext[message->mErrorNumber]) {
MOZ_ASSERT(!message->mArgs.IsEmpty(), "How could we have no args here?");
MOZ_ASSERT(message->mArgs[0].IsEmpty(), "Context should not be set yet!");
if (context) {
// Prepend our context and ": "; see API documentation.
message->mArgs[0].AssignASCII(context);
message->mArgs[0].AppendLiteral(": ");
}
}
const uint32_t argCount = message->mArgs.Length();
const char* args[JS::MaxNumErrorArguments + 1];
for (uint32_t i = 0; i < argCount; ++i) {
args[i] = message->mArgs.ElementAt(i).get();
}
args[argCount] = nullptr;
JS_ReportErrorNumberUTF8Array(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());
MOZ_ASSERT(mUnionState == HasMessage);
delete mExtra.mMessage;
mExtra.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 mExtra.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.
JS::Value& exc = InitJSException();
if (!js::AddRawValueRoot(cx, &exc, "TErrorResult::mExtra::mJSException")) {
// Don't use NS_ERROR_INTERNAL_ERRORRESULT_JS_EXCEPTION, because that
// indicates we have in fact rooted mExtra.mJSException.
mResult = NS_ERROR_OUT_OF_MEMORY;
} else {
exc = exn;
mResult = NS_ERROR_INTERNAL_ERRORRESULT_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, mExtra.mJSException);
if (JS_WrapValue(cx, &exception)) {
JS_SetPendingException(cx, exception);
}
mExtra.mJSException = exception;
// If JS_WrapValue failed, not much we can do about it... No matter
// what, go ahead and unroot mExtra.mJSException.
js::RemoveRawValueRoot(cx, &mExtra.mJSException);
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;
bool operator==(
const TErrorResult<CleanupPolicy>::DOMExceptionInfo& aRight) const {
return mRv == aRight.mRv && mMessage == aRight.mMessage;
}
};
template <typename CleanupPolicy>
void TErrorResult<CleanupPolicy>::SerializeDOMExceptionInfo(
IPC::MessageWriter* aWriter) const {
using namespace IPC;
AssertInOwningThread();
MOZ_ASSERT(mUnionState == HasDOMExceptionInfo);
MOZ_ASSERT(mExtra.mDOMExceptionInfo);
WriteParam(aWriter, mExtra.mDOMExceptionInfo->mMessage);
WriteParam(aWriter, mExtra.mDOMExceptionInfo->mRv);
}
template <typename CleanupPolicy>
bool TErrorResult<CleanupPolicy>::DeserializeDOMExceptionInfo(
IPC::MessageReader* aReader) {
using namespace IPC;
AssertInOwningThread();
nsCString message;
nsresult rv;
if (!ReadParam(aReader, &message) || !ReadParam(aReader, &rv)) {
return false;
}
MOZ_ASSERT(mUnionState == HasNothing);
MOZ_ASSERT(IsDOMException());
InitDOMExceptionInfo(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_INTERNAL_ERRORRESULT_DOMEXCEPTION;
InitDOMExceptionInfo(new DOMExceptionInfo(rv, message));
#ifdef DEBUG
mUnionState = HasDOMExceptionInfo;
#endif
}
template <typename CleanupPolicy>
void TErrorResult<CleanupPolicy>::SetPendingDOMException(JSContext* cx,
const char* context) {
AssertInOwningThread();
MOZ_ASSERT(mUnionState == HasDOMExceptionInfo);
MOZ_ASSERT(mExtra.mDOMExceptionInfo,
"SetPendingDOMException() can be called only once");
if (context && !mExtra.mDOMExceptionInfo->mMessage.IsEmpty()) {
// Prepend our context and ": "; see API documentation.
nsAutoCString prefix(context);
prefix.AppendLiteral(": ");
mExtra.mDOMExceptionInfo->mMessage.Insert(prefix, 0);
}
dom::Throw(cx, mExtra.mDOMExceptionInfo->mRv,
mExtra.mDOMExceptionInfo->mMessage);
ClearDOMExceptionInfo();
mResult = NS_OK;
}
template <typename CleanupPolicy>
void TErrorResult<CleanupPolicy>::ClearDOMExceptionInfo() {
AssertInOwningThread();
MOZ_ASSERT(IsDOMException());
MOZ_ASSERT(mUnionState == HasDOMExceptionInfo);
delete mExtra.mDOMExceptionInfo;
mExtra.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);
mExtra.mJSException.setUndefined();
js::RemoveRawValueRoot(cx, &mExtra.mJSException);
#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()) {
InitMessage(aRHS.mExtra.mMessage);
aRHS.mExtra.mMessage = nullptr;
} else if (aRHS.IsJSException()) {
JSContext* cx = dom::danger::GetJSContext();
MOZ_ASSERT(cx);
JS::Value& exn = InitJSException();
if (!js::AddRawValueRoot(cx, &exn, "TErrorResult::mExtra::mJSException")) {
MOZ_CRASH("Could not root mExtra.mJSException, we're about to OOM");
}
mExtra.mJSException = aRHS.mExtra.mJSException;
aRHS.mExtra.mJSException.setUndefined();
js::RemoveRawValueRoot(cx, &aRHS.mExtra.mJSException);
} else if (aRHS.IsDOMException()) {
InitDOMExceptionInfo(aRHS.mExtra.mDOMExceptionInfo);
aRHS.mExtra.mDOMExceptionInfo = nullptr;
} else {
// Null out the union on both sides for hygiene purposes. This is purely
// precautionary, so InitMessage/placement-new is unnecessary.
mExtra.mMessage = aRHS.mExtra.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>
bool TErrorResult<CleanupPolicy>::operator==(const ErrorResult& aRight) const {
auto right = reinterpret_cast<const TErrorResult<CleanupPolicy>*>(&aRight);
if (mResult != right->mResult) {
return false;
}
if (IsJSException()) {
// js exceptions are always non-equal
return false;
}
if (IsErrorWithMessage()) {
return *mExtra.mMessage == *right->mExtra.mMessage;
}
if (IsDOMException()) {
return *mExtra.mDOMExceptionInfo == *right->mExtra.mDOMExceptionInfo;
}
return true;
}
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
Message* message = aRv.InitMessage(new Message());
message->mArgs = mExtra.mMessage->mArgs.Clone();
message->mErrorNumber = mExtra.mMessage->mErrorNumber;
} else if (IsDOMException()) {
#ifdef DEBUG
aRv.mUnionState = HasDOMExceptionInfo;
#endif
auto* exnInfo = new DOMExceptionInfo(mExtra.mDOMExceptionInfo->mRv,
mExtra.mDOMExceptionInfo->mMessage);
aRv.InitDOMExceptionInfo(exnInfo);
} else if (IsJSException()) {
#ifdef DEBUG
aRv.mUnionState = HasJSException;
#endif
JSContext* cx = dom::danger::GetJSContext();
JS::Rooted<JS::Value> exception(cx, mExtra.mJSException);
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,
const char* context) {
AssertInOwningThread();
if (IsUncatchableException()) {
// Note: ReportUncatchableException will clear any existing exception on cx.
JS::ReportUncatchableException(cx);
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, context);
return;
}
if (IsJSException()) {
SetPendingJSException(cx);
return;
}
if (IsDOMException()) {
SetPendingDOMException(cx, context);
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_INTERNAL_ERRORRESULT_EXCEPTION_ON_JSCONTEXT;
} else {
mResult = NS_ERROR_UNCATCHABLE_EXCEPTION;
}
}
/* static */
template <typename CleanupPolicy>
void TErrorResult<CleanupPolicy>::EnsureUTF8Validity(nsCString& aValue,
size_t aValidUpTo) {
nsCString valid;
if (NS_SUCCEEDED(UTF_8_ENCODING->DecodeWithoutBOMHandling(aValue, valid,
aValidUpTo))) {
aValue = valid;
} else {
aValue.SetLength(aValidUpTo);
}
}
template class TErrorResult<JustAssertCleanupPolicy>;
template class TErrorResult<AssertAndSuppressCleanupPolicy>;
template class TErrorResult<JustSuppressCleanupPolicy>;
template class TErrorResult<ThreadSafeJustSuppressCleanupPolicy>;
} // 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 DefineLegacyUnforgeableMethods(
JSContext* cx, JS::Handle<JSObject*> obj,
const Prefable<const JSFunctionSpec>* props) {
return DefinePrefable(cx, obj, props);
}
bool DefineLegacyUnforgeableAttributes(
JSContext* cx, JS::Handle<JSObject*> obj,
const Prefable<const JSPropertySpec>* props) {
return DefinePrefable(cx, obj, props);
}
bool InterfaceObjectJSNative(JSContext* cx, unsigned argc, JS::Value* vp) {
JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
return NativeHolderFromInterfaceObject(&args.callee())->mNative(cx, argc, vp);
}
bool LegacyFactoryFunctionJSNative(JSContext* cx, unsigned argc,
JS::Value* vp) {
JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
return NativeHolderFromLegacyFactoryFunction(&args.callee())
->mNative(cx, argc, vp);
}
// This creates a JSFunction and sets its length and name properties in the
// order that ECMAScript's CreateBuiltinFunction does.
static JSObject* CreateBuiltinFunctionForConstructor(
JSContext* aCx, JSNative aNative, size_t aNativeReservedSlot,
void* aNativeReserved, unsigned int aNargs, jsid aName,
JS::Handle<JSObject*> aProto) {
JSFunction* fun = js::NewFunctionByIdWithReservedAndProto(
aCx, aNative, aProto, aNargs, JSFUN_CONSTRUCTOR, aName);
if (!fun) {
return nullptr;
}
JS::Rooted<JSObject*> constructor(aCx, JS_GetFunctionObject(fun));
js::SetFunctionNativeReserved(constructor, aNativeReservedSlot,
JS::PrivateValue(aNativeReserved));
// Eagerly force creation of the .length and .name properties, because
// SpiderMonkey creates them lazily (see
bool unused;
if (!JS_HasProperty(aCx, constructor, "length", &unused) ||
!JS_HasProperty(aCx, constructor, "name", &unused)) {
return nullptr;
}
return constructor;
}
static bool DefineConstructor(JSContext* cx, JS::Handle<JSObject*> global,
JS::Handle<jsid> name,
JS::Handle<JSObject*> constructor) {
bool alreadyDefined;
if (!JS_AlreadyHasOwnPropertyById(cx, global, name, &alreadyDefined)) {
return false;
}
// This is Enumerable: False per spec.
return alreadyDefined ||
JS_DefinePropertyById(cx, global, name, constructor, JSPROP_RESOLVING);
}
static bool DefineConstructor(JSContext* cx, JS::Handle<JSObject*> global,
const char* name,
JS::Handle<JSObject*> constructor) {
JSString* nameStr = JS_AtomizeString(cx, name);
if (!nameStr) {
return false;
}
JS::Rooted<JS::PropertyKey> nameKey(cx, JS::PropertyKey::NonIntAtom(nameStr));
return DefineConstructor(cx, global, nameKey, constructor);
}
static bool DefineToStringTag(JSContext* cx, JS::Handle<JSObject*> obj,
JS::Handle<JSString*> class_name) {
JS::Rooted<jsid> toStringTagId(
cx, JS::GetWellKnownSymbolKey(cx, JS::SymbolCode::toStringTag));
return JS_DefinePropertyById(cx, obj, toStringTagId, class_name,
JSPROP_READONLY);
}
static bool InterfaceIsInstance(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" is not an interface object, likewise return false (again, like
// OrdinaryHasInstance). But note that we should CheckedUnwrapStatic here,
// because otherwise we won't get the right answers.
// The static version is OK, because we're looking for interface objects,
// which are not cross-origin objects.
JS::Rooted<JSObject*> thisObj(
cx, js::CheckedUnwrapStatic(&args.thisv().toObject()));
if (!thisObj) {
// Just fall back on the normal thing, in case it still happens to work.
args.rval().setBoolean(false);
return true;
}
if (!IsInterfaceObject(thisObj)) {
args.rval().setBoolean(false);
return true;
}
const DOMInterfaceInfo* interfaceInfo = InterfaceInfoFromObject(thisObj);
// If "this" is a constructor for an interface without a prototype, just fall
// back.
if (interfaceInfo->mPrototypeID == prototypes::id::_ID_Count) {
args.rval().setBoolean(false);
return true;
}
JS::Rooted<JSObject*> instance(cx, &args[0].toObject());
const DOMJSClass* domClass = GetDOMClass(
js::UncheckedUnwrap(instance, /* stopAtWindowProxy = */ false));
if (domClass && domClass->mInterfaceChain[interfaceInfo->mDepth] ==
interfaceInfo->mPrototypeID) {
args.rval().setBoolean(true);
return true;
}
if (IsRemoteObjectProxy(instance, interfaceInfo->mPrototypeID)) {
args.rval().setBoolean(true);
return true;
}
args.rval().setBoolean(false);
return true;
}
bool InitInterfaceOrNamespaceObject(
JSContext* cx, JS::Handle<JSObject*> obj,
const NativeProperties* properties,
const NativeProperties* chromeOnlyProperties, bool isChrome) {
if (properties) {
if (properties->HasStaticMethods() &&
!DefinePrefable(cx, obj, properties->StaticMethods())) {
return false;
}
if (properties->HasStaticAttributes() &&
!DefinePrefable(cx, obj, properties->StaticAttributes())) {
return false;
}
if (properties->HasConstants() &&
!DefinePrefable(cx, obj, properties->Constants())) {
return false;
}
}
if (chromeOnlyProperties && isChrome) {
if (chromeOnlyProperties->HasStaticMethods() &&
!DefinePrefable(cx, obj, chromeOnlyProperties->StaticMethods())) {
return false;
}
if (chromeOnlyProperties->HasStaticAttributes() &&
!DefinePrefable(cx, obj, chromeOnlyProperties->StaticAttributes())) {
return false;
}
if (chromeOnlyProperties->HasConstants() &&
!DefinePrefable(cx, obj, chromeOnlyProperties->Constants())) {
return false;
}
}
return true;
}
// name must be an atom (or JS::PropertyKey::NonIntAtom will assert).
static JSObject* CreateInterfaceObject(
JSContext* cx, JS::Handle<JSObject*> global,
JS::Handle<JSObject*> interfaceProto, const DOMInterfaceInfo* interfaceInfo,
unsigned ctorNargs,
const Span<const LegacyFactoryFunction>& legacyFactoryFunctions,
JS::Handle<JSObject*> proto, const NativeProperties* properties,
const NativeProperties* chromeOnlyProperties, JS::Handle<JSString*> name,
bool isChrome, bool defineOnGlobal,
const char* const* legacyWindowAliases) {
MOZ_ASSERT(interfaceProto);
MOZ_ASSERT(interfaceInfo);
JS::Rooted<jsid> nameId(cx, JS::PropertyKey::NonIntAtom(name));
JS::Rooted<JSObject*> constructor(
cx, CreateBuiltinFunctionForConstructor(
cx, InterfaceObjectJSNative, INTERFACE_OBJECT_INFO_RESERVED_SLOT,
const_cast<DOMInterfaceInfo*>(interfaceInfo), ctorNargs, nameId,
interfaceProto));
if (!constructor) {
return nullptr;
}
if (proto && !JS_LinkConstructorAndPrototype(cx, constructor, proto)) {
return nullptr;
}
if (!InitInterfaceOrNamespaceObject(cx, constructor, properties,
chromeOnlyProperties, isChrome)) {
return nullptr;
}
if (defineOnGlobal && !DefineConstructor(cx, global, nameId, constructor)) {
return nullptr;
}
if (interfaceInfo->wantsInterfaceIsInstance && isChrome &&
!JS_DefineFunction(cx, constructor, "isInstance", InterfaceIsInstance, 1,
// Don't bother making it enumerable
0)) {
return nullptr;
}
if (legacyWindowAliases && NS_IsMainThread()) {
for (; *legacyWindowAliases; ++legacyWindowAliases) {
if (!DefineConstructor(cx, global, *legacyWindowAliases, constructor)) {
return nullptr;
}
}
}
int legacyFactoryFunctionSlot =
INTERFACE_OBJECT_FIRST_LEGACY_FACTORY_FUNCTION;
for (const LegacyFactoryFunction& lff : legacyFactoryFunctions) {
JSString* fname = JS_AtomizeString(cx, lff.mName);
if (!fname) {
return nullptr;
}
nameId = JS::PropertyKey::NonIntAtom(fname);
JS::Rooted<JSObject*> legacyFactoryFunction(
cx, CreateBuiltinFunctionForConstructor(
cx, LegacyFactoryFunctionJSNative,
LEGACY_FACTORY_FUNCTION_RESERVED_SLOT,
const_cast<LegacyFactoryFunction*>(&lff), lff.mNargs, nameId,
nullptr));
if (!legacyFactoryFunction ||
!JS_DefineProperty(cx, legacyFactoryFunction, "prototype", proto,
JSPROP_PERMANENT | JSPROP_READONLY) ||
(defineOnGlobal &&
!DefineConstructor(cx, global, nameId, legacyFactoryFunction))) {
return nullptr;
}
js::SetFunctionNativeReserved(constructor, legacyFactoryFunctionSlot,
JS::ObjectValue(*legacyFactoryFunction));
++legacyFactoryFunctionSlot;
}
return constructor;
}
static JSObject* CreateInterfacePrototypeObject(
JSContext* cx, JS::Handle<JSObject*> global,
JS::Handle<JSObject*> parentProto, const JSClass* protoClass,
const NativeProperties* properties,
const NativeProperties* chromeOnlyProperties,
const char* const* unscopableNames, JS::Handle<JSString*> name,
bool isGlobal) {
JS::Rooted<JSObject*> ourProto(
cx, JS_NewObjectWithGivenProto(cx, 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_NewObjectWithGivenProto(cx, nullptr, nullptr));
if (!unscopableObj) {
return nullptr;
}
for (; *unscopableNames; ++unscopableNames) {
if (!JS_DefineProperty(cx, unscopableObj, *unscopableNames,
JS::TrueHandleValue, JSPROP_ENUMERATE)) {
return nullptr;
}
}
JS::Rooted<jsid> unscopableId(
cx, JS::GetWellKnownSymbolKey(cx, JS::SymbolCode::unscopables));
// Readonly and non-enumerable to match Array.prototype.
if (!JS_DefinePropertyById(cx, ourProto, unscopableId, unscopableObj,
JSPROP_READONLY)) {
return nullptr;
}
}
if (!DefineToStringTag(cx, ourProto, name)) {
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;
}
namespace binding_detail {
void CreateInterfaceObjects(
JSContext* cx, JS::Handle<JSObject*> global,
JS::Handle<JSObject*> protoProto, const DOMIfaceAndProtoJSClass* protoClass,
JS::Heap<JSObject*>* protoCache, JS::Handle<JSObject*> interfaceProto,
const DOMInterfaceInfo* interfaceInfo, unsigned ctorNargs,
bool isConstructorChromeOnly,
const Span<const LegacyFactoryFunction>& legacyFactoryFunctions,
JS::Heap<JSObject*>* constructorCache, const NativeProperties* properties,
const NativeProperties* chromeOnlyProperties, const char* name,
bool defineOnGlobal, const char* const* unscopableNames, bool isGlobal,
const char* const* legacyWindowAliases) {
MOZ_ASSERT(protoClass || interfaceInfo, "Need at least a class or info!");
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()))) ||
interfaceInfo,
"Static methods but no info!");
MOZ_ASSERT(!protoClass == !protoCache,
"If, and only if, there is an interface prototype object we need "
"to cache it");
MOZ_ASSERT(bool(interfaceInfo) == bool(constructorCache),
"If, and only if, there is an interface object we need to cache "
"it");
MOZ_ASSERT(interfaceProto || !interfaceInfo,
"Must have a interface proto if we plan to create an interface "
"object");
bool isChrome = nsContentUtils::ThreadsafeIsSystemCaller(cx);
JS::Rooted<JSString*> nameStr(cx, JS_AtomizeString(cx, name));
if (!nameStr) {
return;
}
JS::Rooted<JSObject*> proto(cx);
if (protoClass) {
proto = CreateInterfacePrototypeObject(
cx, global, protoProto, protoClass->ToJSClass(), properties,
isChrome ? chromeOnlyProperties : nullptr, unscopableNames, nameStr,
isGlobal);
if (!proto) {
return;
}
*protoCache = proto;
} else {
MOZ_ASSERT(!proto);
}
JSObject* interface;
if (interfaceInfo) {
interface = CreateInterfaceObject(
cx, global, interfaceProto, interfaceInfo,
(isChrome || !isConstructorChromeOnly) ? ctorNargs : 0,
legacyFactoryFunctions, proto, properties, chromeOnlyProperties,
nameStr, isChrome, defineOnGlobal, legacyWindowAliases);
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;
}
}
} // namespace binding_detail
void CreateNamespaceObject(JSContext* cx, JS::Handle<JSObject*> global,
JS::Handle<JSObject*> namespaceProto,
const DOMIfaceAndProtoJSClass& namespaceClass,
JS::Heap<JSObject*>* namespaceCache,
const NativeProperties* properties,
const NativeProperties* chromeOnlyProperties,
const char* name, bool defineOnGlobal) {
JS::Rooted<JSString*> nameStr(cx, JS_AtomizeString(cx, name));
if (!nameStr) {
return;
}
JS::Rooted<jsid> nameId(cx, JS::PropertyKey::NonIntAtom(nameStr));
JS::Rooted<JSObject*> namespaceObj(
cx, JS_NewObjectWithGivenProto(cx, namespaceClass.ToJSClass(),
namespaceProto));
if (!namespaceObj) {
return;
}
if (!InitInterfaceOrNamespaceObject(
cx, namespaceObj, properties, chromeOnlyProperties,
nsContentUtils::ThreadsafeIsSystemCaller(cx))) {
return;
}
if (defineOnGlobal && !DefineConstructor(cx, global, nameId, namespaceObj)) {
return;
}
if (!DefineToStringTag(cx, namespaceObj, nameStr)) {
return;
}
*namespaceCache = namespaceObj;
}
// Only set aAllowNativeWrapper to false if you really know you need it; if in
// doubt use true. Setting it to false disables security wrappers.
static 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) {
JS::Rooted<JSObject*> obj(aCx, cache->GetWrapper());
if (!obj) {
obj = cache->WrapObject(aCx, nullptr);
if (!obj) {
return Throw(aCx, NS_ERROR_UNEXPECTED);
}
}
if (aAllowNativeWrapper && !JS_WrapObject(aCx, &obj)) {
return false;
}
aRetval.setObject(*obj);
return true;
}
MOZ_ASSERT(NS_IsMainThread());
if (!XPCConvert::NativeInterface2JSObject(aCx, aRetval, 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(JS::Handle<JSObject*> obj) {
MOZ_ASSERT(IsDOMObject(obj));
// nsISupports objects are special cased because DOM proxies are nsISupports
// and have addProperty hooks that do more than wrapper preservation (so we
// don't want to call them).
if (nsISupports* native = UnwrapDOMObjectToISupports(obj)) {
nsWrapperCache* cache = nullptr;
CallQueryInterface(native, &cache);
if (cache) {
cache->PreserveWrapper(native);
}
return true;
}
// The addProperty hook for WebIDL classes does wrapper preservation, and
// nothing else, so call it, if present.
const JSClass* clasp = JS::GetClass(obj);
const DOMJSClass* domClass = GetDOMClass(clasp);
// We expect all proxies to be nsISupports.
MOZ_RELEASE_ASSERT(clasp->isNativeObject(),
"Should not call addProperty for proxies.");
JSAddPropertyOp addProperty = clasp->getAddProperty();
if (!addProperty) {
return true;
}
// The class should have an addProperty hook iff it is a CC participant.
MOZ_RELEASE_ASSERT(domClass->mParticipant);
JS::Rooted<jsid> dummyId(RootingCx());
JS::Rooted<JS::Value> dummyValue(RootingCx());
return addProperty(nullptr, obj, dummyId, dummyValue);
}
bool HasReleasedWrapper(JS::Handle<JSObject*> obj) {
MOZ_ASSERT(obj);
MOZ_ASSERT(IsDOMObject(obj));
nsWrapperCache* cache = nullptr;
if (nsISupports* native = UnwrapDOMObjectToISupports(obj)) {
CallQueryInterface(native, &cache);
} else {
const JSClass* clasp = JS::GetClass(obj);
const DOMJSClass* domClass = GetDOMClass(clasp);
// We expect all proxies to be nsISupports.
MOZ_RELEASE_ASSERT(clasp->isNativeObject(),
"Should not call getWrapperCache for proxies.");
WrapperCacheGetter getter = domClass->mWrapperCacheGetter;
if (getter) {
// If the class has a wrapper cache getter it must be a CC participant.
MOZ_RELEASE_ASSERT(domClass->mParticipant);
cache = getter(obj);
}
}
return cache && !cache->PreservingWrapper();
}
// Can only be called with a DOM JSClass.
bool InstanceClassHasProtoAtDepth(const JSClass* 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) {
return NativeInterface2JSObjectAndThrowIfFailed(cx, scope, rval, helper, iid,
allowNativeWrapper);
}
bool VariantToJsval(JSContext* aCx, nsIVariant* aVariant,
JS::MutableHandle<JS::Value> aRetval) {
nsresult rv;
if (!XPCVariant::VariantDataToJS(aCx, 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 WrapObject(JSContext* cx, const WindowProxyHolder& p,
JS::MutableHandle<JS::Value> rval) {
return ToJSValue(cx, p, rval);
}
// {JSPropertySpec,JSFunctionSpec} use {JSPropertySpec,JSFunctionSpec}::Name
// and ConstantSpec uses `const char*` for name field.
static inline JSPropertySpec::Name ToPropertySpecName(
JSPropertySpec::Name name) {
return name;
}
static inline JSPropertySpec::Name ToPropertySpecName(const char* name) {
return JSPropertySpec::Name(name);
}
template <typename SpecT>
static bool InitPropertyInfos(JSContext* cx, const Prefable<SpecT>* pref,
PropertyInfo* infos, PropertyType type) {
MOZ_ASSERT(pref);
MOZ_ASSERT(pref->specs);
// Index of the Prefable that contains the id for the current PropertyInfo.
uint32_t prefIndex = 0;
do {
// We ignore whether the set of ids is enabled and just intern all the IDs,
// because this is only done once per application runtime.
const SpecT* spec = pref->specs;
// Index of the property/function/constant spec for our current PropertyInfo
// in the "specs" array of the relevant Prefable.
uint32_t specIndex = 0;
do {
jsid id;
if (!JS::PropertySpecNameToPermanentId(cx, ToPropertySpecName(spec->name),
&id)) {
return false;
}
infos->SetId(id);
infos->type = type;
infos->prefIndex = prefIndex;
infos->specIndex = specIndex++;
++infos;
} while ((++spec)->name);
++prefIndex;
} while ((++pref)->specs);
return true;
}
#define INIT_PROPERTY_INFOS_IF_DEFINED(TypeName) \
{ \
if (nativeProperties->Has##TypeName##s() && \
!InitPropertyInfos(cx, nativeProperties->TypeName##s(), \
nativeProperties->TypeName##PropertyInfos(), \
e##TypeName)) { \
return false; \
} \
}
static bool InitPropertyInfos(JSContext* cx,
const NativeProperties* nativeProperties) {
INIT_PROPERTY_INFOS_IF_DEFINED(StaticMethod);
INIT_PROPERTY_INFOS_IF_DEFINED(StaticAttribute);
INIT_PROPERTY_INFOS_IF_DEFINED(Method);
INIT_PROPERTY_INFOS_IF_DEFINED(Attribute);
INIT_PROPERTY_INFOS_IF_DEFINED(UnforgeableMethod);
INIT_PROPERTY_INFOS_IF_DEFINED(UnforgeableAttribute);
INIT_PROPERTY_INFOS_IF_DEFINED(Constant);
// Initialize and sort the index array.
uint16_t* indices = nativeProperties->sortedPropertyIndices;
auto count = nativeProperties->propertyInfoCount;
for (auto i = 0; i < count; ++i) {
indices[i] = i;
}
std::sort(indices, indices + count,
[infos = nativeProperties->PropertyInfos()](const uint16_t left,
const uint16_t right) {
// std::sort may call us with the same element by design but
// PropertyInfo::Compare does not like that.
if (left == right) {
return false;
}
return PropertyInfo::Compare(infos[left], infos[right]) < 0;
});
return true;
}
#undef INIT_PROPERTY_INFOS_IF_DEFINED
static inline bool InitPropertyInfos(
JSContext* aCx, const NativePropertiesHolder& nativeProperties) {
MOZ_ASSERT(NS_IsMainThread());
if (!*nativeProperties.inited) {
if (nativeProperties.regular &&
!InitPropertyInfos(aCx, nativeProperties.regular)) {
return false;
}
if (nativeProperties.chromeOnly &&
!InitPropertyInfos(aCx, nativeProperties.chromeOnly)) {
return false;
}
*nativeProperties.inited = true;
}
return true;
}
void GetInterfaceImpl(JSContext* aCx, nsIInterfaceRequestor* aRequestor,
nsWrapperCache* aCache, JS::Handle<JS::Value> aIID,
JS::MutableHandle<JS::Value> aRetval,
ErrorResult& aError) {
Maybe<nsIID> iid = xpc::JSValue2ID(aCx, aIID);
if (!iid) {
aError.Throw(NS_ERROR_XPC_BAD_CONVERT_JS);
return;
}
RefPtr<nsISupports> result;
aError = aRequestor->GetInterface(*iid, getter_AddRefs(result));
if (aError.Failed()) {
return;
}
if (!WrapObject(aCx, result, iid.ptr(), aRetval)) {
aError.Throw(NS_ERROR_FAILURE);
}
}
bool ThrowingConstructor(JSContext* cx, unsigned argc, JS::Value* vp) {
// Cast nullptr to void* to work around
return ThrowErrorMessage<MSG_ILLEGAL_CONSTRUCTOR>(cx, (void*)nullptr);
}
bool ThrowConstructorWithoutNew(JSContext* cx, const char* name) {
return ThrowErrorMessage<MSG_CONSTRUCTOR_WITHOUT_NEW>(cx, name);
}
inline const NativePropertyHooks* GetNativePropertyHooksFromJSNative(
JS::Handle<JSObject*> obj) {
return NativeHolderFromObject(obj)->mPropertyHooks;
}
inline const NativePropertyHooks* GetNativePropertyHooks(
JSContext* cx, JS::Handle<JSObject*> obj, DOMObjectType& type) {
const JSClass* clasp = JS::GetClass(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(obj)) {
type = eInterface;
return GetNativePropertyHooksFromJSNative(obj);
}
MOZ_ASSERT(IsDOMIfaceAndProtoClass(JS::GetClass(obj)));
const DOMIfaceAndProtoJSClass* ifaceAndProtoJSClass =
DOMIfaceAndProtoJSClass::FromJSClass(JS::GetClass(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 (id.isString()) {
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;
}
struct IdToIndexComparator {
// The id we're searching for.
const jsid& mId;
// Whether we're searching for static operations.
const bool mStatic;
// The list of ids we're searching in.
const PropertyInfo* mInfos;
IdToIndexComparator(const jsid& aId, DOMObjectType aType,
const PropertyInfo* aInfos)
: mId(aId),
mStatic(aType == eInterface || aType == eNamespace),
mInfos(aInfos) {}
int operator()(const uint16_t aIndex) const {
const PropertyInfo& info = mInfos[aIndex];
if (mId.asRawBits() == info.Id().asRawBits()) {
if (info.type != eMethod && info.type != eStaticMethod) {
return 0;
}
if (mStatic == info.IsStaticMethod()) {
// We're looking for static properties and we've found a static one for
// the right name.
return 0;
}
// Static operations are sorted before others by PropertyInfo::Compare.
return mStatic ? -1 : 1;
}
return mId.asRawBits() < info.Id().asRawBits() ? -1 : 1;
}
};
static const PropertyInfo* XrayFindOwnPropertyInfo(
JSContext* cx, DOMObjectType type, JS::Handle<jsid> id,
const NativeProperties* nativeProperties) {
if ((type == eInterfacePrototype || type == eGlobalInstance) &&
MOZ_UNLIKELY(nativeProperties->iteratorAliasMethodIndex >= 0) &&
id.isWellKnownSymbol(JS::SymbolCode::iterator)) {
return nativeProperties->MethodPropertyInfos() +
nativeProperties->iteratorAliasMethodIndex;
}
size_t idx;
const uint16_t* sortedPropertyIndices =
nativeProperties->sortedPropertyIndices;
const PropertyInfo* propertyInfos = nativeProperties->PropertyInfos();
if (BinarySearchIf(sortedPropertyIndices, 0,
nativeProperties->propertyInfoCount,
IdToIndexComparator(id, type, propertyInfos), &idx)) {
return propertyInfos + sortedPropertyIndices[idx];
}
return nullptr;
}
static bool XrayResolveAttribute(
JSContext* cx, JS::Handle<JSObject*> wrapper, JS::Handle<JSObject*> obj,
JS::Handle<jsid> id, const Prefable<const JSPropertySpec>& pref,
const JSPropertySpec& attrSpec,
JS::MutableHandle<Maybe<JS::PropertyDescriptor>> desc,
bool& cacheOnHolder) {
if (!pref.isEnabled(cx, obj)) {
return true;
}
MOZ_ASSERT(attrSpec.isAccessor());
MOZ_ASSERT(
!attrSpec.isSelfHosted(),
"Bad JSPropertySpec declaration: unsupported self-hosted accessor");
cacheOnHolder = true;
JS::Rooted<jsid> getterId(cx);
if (!JS::ToGetterId(cx, id, &getterId)) {
return false;
}
// 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.
// They all have getters, so we can just make it.
JS::Rooted<JSObject*> getter(
cx, XrayCreateFunction(cx, wrapper, attrSpec.u.accessors.getter.native, 0,
getterId));
if (!getter) {
return false;
}
JS::Rooted<JSObject*> setter(cx);
if (attrSpec.u.accessors.setter.native.op) {
JS::Rooted<jsid> setterId(cx);
if (!JS::ToSetterId(cx, id, &setterId)) {
return false;
}
// We have a setter! Make it.
setter = XrayCreateFunction(cx, wrapper, attrSpec.u.accessors.setter.native,
1, setterId);
if (!setter) {
return false;
}
}
desc.set(Some(
JS::PropertyDescriptor::Accessor(getter, setter, attrSpec.attributes())));
return true;
}
static bool XrayResolveMethod(
JSContext* cx, JS::Handle<JSObject*> wrapper, JS::Handle<JSObject*> obj,
JS::Handle<jsid> id, const Prefable<const JSFunctionSpec>& pref,
const JSFunctionSpec& methodSpec,
JS::MutableHandle<Maybe<JS::PropertyDescriptor>> desc,
bool& cacheOnHolder) {
if (!pref.isEnabled(cx, obj)) {
return true;
}
cacheOnHolder = true;
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.set(Some(JS::PropertyDescriptor::Data(JS::ObjectValue(*funobj),
methodSpec.flags)));
return true;
}
static bool XrayResolveConstant(
JSContext* cx, JS::Handle<JSObject*> wrapper, JS::Handle<JSObject*> obj,
JS::Handle<jsid>, const Prefable<const ConstantSpec>& pref,
const ConstantSpec& constantSpec,
JS::MutableHandle<Maybe<JS::PropertyDescriptor>> desc,
bool& cacheOnHolder) {
if (!pref.isEnabled(cx, obj)) {
return true;
}
cacheOnHolder = true;
desc.set(Some(JS::PropertyDescriptor::Data(
constantSpec.value, {JS::PropertyAttribute::Enumerable})));
return true;
}
#define RESOLVE_CASE(PropType, SpecType, Resolver) \
case e##PropType: { \
MOZ_ASSERT(nativeProperties->Has##PropType##s()); \
const Prefable<const SpecType>& pref = \
nativeProperties->PropType##s()[propertyInfo.prefIndex]; \
return Resolver(cx, wrapper, obj, id, pref, \
pref.specs[propertyInfo.specIndex], desc, cacheOnHolder); \
}
static bool XrayResolveProperty(
JSContext* cx, JS::Handle<JSObject*> wrapper, JS::Handle<JSObject*> obj,
JS::Handle<jsid> id, JS::MutableHandle<Maybe<JS::PropertyDescriptor>> desc,
bool& cacheOnHolder, DOMObjectType type,
const NativeProperties* nativeProperties,
const PropertyInfo& propertyInfo) {
MOZ_ASSERT(type != eGlobalInterfacePrototype);
// Make sure we resolve for matched object type.
switch (propertyInfo.type) {
case eStaticMethod:
case eStaticAttribute:
if (type != eInterface && type != eNamespace) {
return true;
}
break;
case eMethod:
case eAttribute:
if (type != eGlobalInstance && type != eInterfacePrototype) {
return true;
}
break;
case eUnforgeableMethod:
case eUnforgeableAttribute:
if (!IsInstance(type)) {
return true;
}
break;
case eConstant:
if (IsInstance(type)) {
return true;
}
break;
}
switch (propertyInfo.type) {
RESOLVE_CASE(StaticMethod, JSFunctionSpec, XrayResolveMethod)
RESOLVE_CASE(StaticAttribute, JSPropertySpec, XrayResolveAttribute)
RESOLVE_CASE(Method, JSFunctionSpec, XrayResolveMethod)
RESOLVE_CASE(Attribute, JSPropertySpec, XrayResolveAttribute)
RESOLVE_CASE(UnforgeableMethod, JSFunctionSpec, XrayResolveMethod)
RESOLVE_CASE(UnforgeableAttribute, JSPropertySpec, XrayResolveAttribute)
RESOLVE_CASE(Constant, ConstantSpec, XrayResolveConstant)
}
return true;
}
#undef RESOLVE_CASE
static bool ResolvePrototypeOrConstructor(
JSContext* cx, JS::Handle<JSObject*> wrapper, JS::Handle<JSObject*> obj,
size_t protoAndIfaceCacheIndex, unsigned attrs,
JS::MutableHandle<Maybe<JS::PropertyDescriptor>> desc,
bool& cacheOnHolder) {
JS::Rooted<JSObject*> global(cx, JS::GetNonCCWObjectGlobal(obj));
{
JSAutoRealm ar(cx, global);
ProtoAndIfaceCache& protoAndIfaceCache = *GetProtoAndIfaceCache(global);
// This function is called when resolving the "constructor" and "prototype"
// properties of Xrays for DOM prototypes and constructors respectively.
// This means the relevant Xray exists, which means its _target_ exists.
// And that means we managed to successfullly create the prototype or
// constructor, respectively, and hence must have managed to create the
// thing it's pointing to as well. So our entry slot must exist.
JSObject* protoOrIface =
protoAndIfaceCache.EntrySlotMustExist(protoAndIfaceCacheIndex);
MOZ_RELEASE_ASSERT(protoOrIface, "How can this object not exist?");
cacheOnHolder = true;
desc.set(Some(
JS::PropertyDescriptor::Data(JS::ObjectValue(*protoOrIface), attrs)));
}
return JS_WrapPropertyDescriptor(cx, desc);
}
/* static */ bool XrayResolveOwnProperty(
JSContext* cx, JS::Handle<JSObject*> wrapper, JS::Handle<JSObject*> obj,
JS::Handle<jsid> id, JS::MutableHandle<Maybe<JS::PropertyDescriptor>> desc,
bool& cacheOnHolder) {
MOZ_ASSERT(desc.isNothing());
cacheOnHolder = false;
DOMObjectType type;
const NativePropertyHooks* nativePropertyHooks =
GetNativePropertyHooks(cx, obj, type);
ResolveOwnProperty resolveOwnProperty =
nativePropertyHooks->mIndexedOrNamedNativeProperties
? nativePropertyHooks->mIndexedOrNamedNativeProperties
->mResolveOwnProperty
: nullptr;
if (type == eNamedPropertiesObject) {
MOZ_ASSERT(!resolveOwnProperty,
"Shouldn't have any Xray-visible properties");
return true;
}
const NativePropertiesHolder& nativePropertiesHolder =
nativePropertyHooks->mNativeProperties;
if (!InitPropertyInfos(cx, nativePropertiesHolder)) {
return false;
}
const NativeProperties* nativeProperties = nullptr;
const PropertyInfo* found = nullptr;
if ((nativeProperties = nativePropertiesHolder.regular)) {
found = XrayFindOwnPropertyInfo(cx, type, id, nativeProperties);
}
if (!found && (nativeProperties = nativePropertiesHolder.chromeOnly) &&
xpc::AccessCheck::isChrome(JS::GetCompartment(wrapper))) {
found = XrayFindOwnPropertyInfo(cx, type, id, nativeProperties);
}
if (IsInstance(type)) {
// Check for unforgeable properties first to prevent names provided by
// resolveOwnProperty callback from shadowing them.
if (found && (found->type == eUnforgeableMethod ||
found->type == eUnforgeableAttribute)) {
if (!XrayResolveProperty(cx, wrapper, obj, id, desc, cacheOnHolder, type,
nativeProperties, *found)) {
return false;
}
if (desc.isSome()) {
return true;
}
}
if (resolveOwnProperty) {
if (!resolveOwnProperty(cx, wrapper, obj, id, desc)) {
return false;
}
if (desc.isSome()) {
// None of these should be cached on the holder, since they're dynamic.
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 (id.get() == GetJSIDByIndex(cx, XPCJSContext::IDX_PROTOTYPE)) {
return nativePropertyHooks->mPrototypeID == prototypes::id::_ID_Count ||
ResolvePrototypeOrConstructor(
cx, wrapper, obj, nativePropertyHooks->mPrototypeID,
JSPROP_PERMANENT | JSPROP_READONLY, desc, cacheOnHolder);
}
if (id.get() == GetJSIDByIndex(cx, XPCJSContext::IDX_ISINSTANCE)) {
if (IsInterfaceObject(obj) &&
InterfaceInfoFromObject(obj)->wantsInterfaceIsInstance) {
cacheOnHolder = true;
JSObject* funObj = XrayCreateFunction(
cx, wrapper, {InterfaceIsInstance, nullptr}, 1, id);
if (!funObj) {
return false;
}
desc.set(Some(JS::PropertyDescriptor::Data(
JS::ObjectValue(*funObj), {JS::PropertyAttribute::Configurable,
JS::PropertyAttribute::Writable})));
return true;
}
}
if (id.get() == GetJSIDByIndex(cx, XPCJSContext::IDX_NAME)) {
const char* name = IsInterfaceObject(obj)
? InterfaceInfoFromObject(obj)->mConstructorName
: LegacyFactoryFunctionFromObject(obj)->mName;
JSString* nameStr = JS_NewStringCopyZ(cx, name);
if (!nameStr) {
return false;
}
desc.set(Some(JS::PropertyDescriptor::Data(
JS::StringValue(nameStr), {JS::PropertyAttribute::Configurable,
JS::PropertyAttribute::Enumerable})));
return true;
}
if (id.get() == GetJSIDByIndex(cx, XPCJSContext::IDX_LENGTH)) {
uint8_t length = IsInterfaceObject(obj)
? InterfaceInfoFromObject(obj)->mConstructorArgs
: LegacyFactoryFunctionFromObject(obj)->mNargs;
desc.set(Some(JS::PropertyDescriptor::Data(
JS::Int32Value(length), {JS::PropertyAttribute::Configurable,
JS::PropertyAttribute::Enumerable})));
return true;
}
} else if (type == eNamespace) {
if (id.isWellKnownSymbol(JS::SymbolCode::toStringTag)) {
JS::Rooted<JSString*> nameStr(
cx, JS_AtomizeString(cx, JS::GetClass(obj)->name));
if (!nameStr) {
return false;
}
desc.set(Some(JS::PropertyDescriptor::Data(
JS::StringValue(nameStr), {JS::PropertyAttribute::Configurable})));
return true;
}
} else {
MOZ_ASSERT(IsInterfacePrototype(type));
if (id.get() == GetJSIDByIndex(cx, XPCJSContext::IDX_CONSTRUCTOR)) {
return nativePropertyHooks->mConstructorID ==
constructors::id::_ID_Count ||
ResolvePrototypeOrConstructor(cx, wrapper, obj,
nativePropertyHooks->mConstructorID,
0, desc, cacheOnHolder);
}
if (id.isWellKnownSymbol(JS::SymbolCode::toStringTag)) {
const JSClass* objClass = JS::GetClass(obj);
prototypes::ID prototypeID =
DOMIfaceAndProtoJSClass::FromJSClass(objClass)->mPrototypeID;
JS::Rooted<JSString*> nameStr(
cx, JS_AtomizeString(cx, NamesOfInterfacesWithProtos(prototypeID)));
if (!nameStr) {
return false;
}
desc.set(Some(JS::PropertyDescriptor::Data(
JS::StringValue(nameStr), {JS::PropertyAttribute::Configurable})));
return true;
}
// 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 (found && !XrayResolveProperty(cx, wrapper, obj, id, desc, cacheOnHolder,
type, nativeProperties, *found)) {
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* done) {
if (!js::IsProxy(obj)) return true;
const DOMProxyHandler* handler = GetDOMProxyHandler(obj);
return handler->defineProperty(cx, wrapper, id, desc, result, done);
}
template <typename SpecType>
bool XrayAppendPropertyKeys(JSContext* cx, JS::Handle<JSObject*> obj,
const Prefable<const SpecType>* pref,
const PropertyInfo* infos, unsigned flags,
JS::MutableHandleVector<jsid> props) {
do {
bool prefIsEnabled = pref->isEnabled(cx, obj);
if (prefIsEnabled) {
const SpecType* spec = pref->specs;
do {
const jsid id = infos++->Id();
if (((flags & JSITER_HIDDEN) ||
(spec->attributes() & JSPROP_ENUMERATE)) &&
((flags & JSITER_SYMBOLS) || !id.isSymbol()) && !props.append(id)) {
return false;
}
} while ((++spec)->name);
}
// Break if we have reached the end of pref.
if (!(++pref)->specs) {
break;
}
// Advance infos if the previous pref is disabled. The -1 is required
// because there is an end-of-list terminator between pref->specs and
// (pref - 1)->specs.
if (!prefIsEnabled) {
infos += pref->specs - (pref - 1)->specs - 1;
}
} while (1);
return true;
}
template <>
bool XrayAppendPropertyKeys<ConstantSpec>(
JSContext* cx, JS::Handle<JSObject*> obj,
const Prefable<const ConstantSpec>* pref, const PropertyInfo* infos,
unsigned flags, JS::MutableHandleVector<jsid> props) {
do {
bool prefIsEnabled = pref->isEnabled(cx, obj);
if (prefIsEnabled) {
const ConstantSpec* spec = pref->specs;
do {
if (!props.append(infos++->Id())) {
return false;
}
} while ((++spec)->name);
}
// Break if we have reached the end of pref.
if (!(++pref)->specs) {
break;
}
// Advance infos if the previous pref is disabled. The -1 is required
// because there is an end-of-list terminator between pref->specs and
// (pref - 1)->specs.
if (!prefIsEnabled) {
infos += pref->specs - (pref - 1)->specs - 1;
}
} while (1);
return true;
}
#define ADD_KEYS_IF_DEFINED(FieldName) \
{ \
if (nativeProperties->Has##FieldName##s() && \
!XrayAppendPropertyKeys(cx, obj, nativeProperties->FieldName##s(), \
nativeProperties->FieldName##PropertyInfos(), \
flags, props)) { \
return false; \
} \
}
bool XrayOwnPropertyKeys(JSContext* cx, JS::Handle<JSObject*> wrapper,
JS::Handle<JSObject*> obj, unsigned flags,
JS::MutableHandleVector<jsid> 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 {
MOZ_ASSERT(type != eGlobalInterfacePrototype);
if (type == eInterface || type == eNamespace) {
ADD_KEYS_IF_DEFINED(StaticMethod);
ADD_KEYS_IF_DEFINED(StaticAttribute);
} else {
MOZ_ASSERT(type == eInterfacePrototype);
ADD_KEYS_IF_DEFINED(Method);
ADD_KEYS_IF_DEFINED(Attribute);
}
ADD_KEYS_IF_DEFINED(Constant);
}
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::MutableHandleVector<jsid> 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 (!InitPropertyInfos(cx, nativeProperties)) {
return false;
}
if (nativeProperties.regular &&
!XrayOwnPropertyKeys(cx, wrapper, obj, flags, props, type,
nativeProperties.regular)) {
return false;
}
if (nativeProperties.chromeOnly &&
xpc::AccessCheck::isChrome(JS::GetCompartment(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::MutableHandleVector<jsid> props) {
DOMObjectType type;
const NativePropertyHooks* nativePropertyHooks =
GetNativePropertyHooks(cx, obj, type);
EnumerateOwnProperties enumerateOwnProperties =
nativePropertyHooks->mIndexedOrNamedNativeProperties
? nativePropertyHooks->mIndexedOrNamedNativeProperties
->mEnumerateOwnProperties
: nullptr;
if (type == eNamedPropertiesObject) {
MOZ_ASSERT(!enumerateOwnProperties,
"Shouldn't have any Xray-visible properties");
return true;
}
if (IsInstance(type)) {
// 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->mIndexedOrNamedNativeProperties ||
!nativePropertyHooks->mIndexedOrNamedNativeProperties
->mDeleteNamedProperty) {
return opresult.succeed();
}
return nativePropertyHooks->mIndexedOrNamedNativeProperties
->mDeleteNamedProperty(cx, wrapper, obj, id, opresult);
}
namespace binding_detail {
bool ResolveOwnProperty(JSContext* cx, JS::Handle<JSObject*> wrapper,
JS::Handle<JSObject*> obj, JS::Handle<jsid> id,
JS::MutableHandle<Maybe<JS::PropertyDescriptor>> desc) {
return js::GetProxyHandler(obj)->getOwnPropertyDescriptor(cx, wrapper, id,
desc);
}
bool EnumerateOwnProperties(JSContext* cx, JS::Handle<JSObject*> wrapper,
JS::Handle<JSObject*> obj,
JS::MutableHandleVector<jsid> props) {
return js::GetProxyHandler(obj)->ownPropertyKeys(cx, wrapper, props);
}
} // namespace binding_detail
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);
bool sEmptyNativePropertiesInited = true;
NativePropertyHooks sEmptyNativePropertyHooks = {
nullptr,
{nullptr, nullptr, &sEmptyNativePropertiesInited},
prototypes::id::_ID_Count,
constructors::id::_ID_Count,
nullptr};
bool GetPropertyOnPrototype(JSContext* cx, JS::Handle<JSObject*> proxy,
JS::Handle<JS::Value> receiver, JS::Handle<jsid> id,
bool* found, JS::MutableHandle<JS::Value> vp) {
JS::Rooted<JSObject*> proto(cx);
if (!js::GetObjectProto(cx, proxy, &proto)) {
return false;
}
if (!proto) {
*found = false;
return true;
}
if (!JS_HasPropertyById(cx, proto, id, found)) {
return false;
}
if (!*found) {
return true;
}
return JS_ForwardGetPropertyTo(cx, proto, id, receiver, vp);
}
bool HasPropertyOnPrototype(JSContext* cx, JS::Handle<JSObject*> proxy,
JS::Handle<jsid> id, bool* has) {
JS::Rooted<JSObject*> proto(cx);
if (!js::GetObjectProto(cx, proxy, &proto)) {
return false;
}
if (!proto) {
*has = false;
return true;
}
return JS_HasPropertyById(cx, proto, id, has);
}
bool AppendNamedPropertyIds(JSContext* cx, JS::Handle<JSObject*> proxy,
nsTArray<nsString>& names,
bool shadowPrototypeProperties,
JS::MutableHandleVector<jsid> 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, aJSON.BeginReading(), 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 UpdateReflectorGlobal(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.
js::AutoCheckRecursionLimit recursion(aCx);
if (!recursion.checkConservative(aCx)) {
aError.StealExceptionFromJSContext(aCx);
return;
}
JS::Rooted<JSObject*> aObj(aCx, aObjArg);
MOZ_ASSERT(IsDOMObject(aObj));
const DOMJSClass* domClass = GetDOMClass(aObj);
JS::Rooted<JSObject*> oldGlobal(aCx, JS::GetNonCCWObjectGlobal(aObj));
MOZ_ASSERT(JS_IsGlobalObject(oldGlobal));
JS::Rooted<JSObject*> newGlobal(aCx,
domClass->mGetAssociatedGlobal(aCx, aObj));
MOZ_ASSERT(JS_IsGlobalObject(newGlobal));
JSAutoRealm oldAr(aCx, oldGlobal);
if (oldGlobal == newGlobal) {
return;
}
nsISupports* native = UnwrapDOMObjectToISupports(aObj);
if (!native) {
return;
}
bool isProxy = js::IsProxy(aObj);
JS::Rooted<JSObject*> expandoObject(aCx);
if (isProxy) {
expandoObject = DOMProxyHandler::GetAndClearExpandoObject(aObj);
}
JSAutoRealm newAr(aCx, newGlobal);
// 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;
}
// Assert it's possible to create wrappers when |aObj| and |newobj| are in
// different compartments.
MOZ_ASSERT_IF(JS::GetCompartment(aObj) != JS::GetCompartment(newobj),
js::AllowNewWrapper(JS::GetCompartment(aObj), newobj));
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_CopyOwnPropertiesAndPrivateFields(aCx, propertyHolder, copyFrom)) {
aError.StealExceptionFromJSContext(aCx);
return;
}
} else {
propertyHolder = nullptr;
}
// 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|. Update the wrapper cache
// to keep everything consistent in case GC moves newobj.
//
// NB: It's important to do this _after_ copying the properties to
// propertyHolder. Otherwise, an object with |foo.x === foo| will
// crash when JS_CopyOwnPropertiesAndPrivateFields tries to call wrap() on
// foo.x.
JS::SetReservedSlot(newobj, DOM_OBJECT_SLOT,
JS::GetReservedSlot(aObj, DOM_OBJECT_SLOT));
JS::SetReservedSlot(aObj, DOM_OBJECT_SLOT, JS::PrivateValue(nullptr));
nsWrapperCache* cache = nullptr;
CallQueryInterface(native, &cache);
cache->UpdateWrapperForNewGlobal(native, newobj);
aObj = xpc::TransplantObjectRetainingXrayExpandos(aCx, aObj, newobj);
if (!aObj) {
MOZ_CRASH();
}
// Update the wrapper cache again if transplanting didn't use newobj but
// returned some other object.
if (aObj != newobj) {
MOZ_ASSERT(UnwrapDOMObjectToISupports(aObj) == native);
cache->UpdateWrapperForNewGlobal(native, aObj);
}
if (propertyHolder) {
JS::Rooted<JSObject*> copyTo(aCx);
if (isProxy) {
copyTo = DOMProxyHandler::EnsureExpandoObject(aCx, aObj);
} else {
copyTo = aObj;
}
if (!copyTo ||
!JS_CopyOwnPropertiesAndPrivateFields(aCx, copyTo, propertyHolder)) {
MOZ_CRASH();
}
}
}
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)) {
// aCx correctly represents the current global here.
obj = js::CheckedUnwrapDynamic(obj, aCx, /* 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::GetNonCCWObjectGlobal(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.
//
// It's OK to use ReflectorToISupportsStatic, because we know we don't have a
// cross-compartment wrapper.
nsCOMPtr<nsISupports> supp = xpc::ReflectorToISupportsStatic(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;
}
JS::Realm* realm = js::GetContextRealm(mCx);
MOZ_ASSERT(realm);
JSPrincipals* principals = JS::GetRealmPrincipals(realm);
return nsJSPrincipals::get(principals);
}
CallerType GlobalObject::CallerType() const {
return nsContentUtils::ThreadsafeIsSystemCaller(mCx)
? dom::CallerType::System
: dom::CallerType::NonSystem;
}
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(DeprecatedOperations::eLenientThis);
}
return true;
}
bool GetContentGlobalForJSImplementedObject(BindingCallContext& cx,
JS::Handle<JSObject*> obj,
nsIGlobalObject** globalObj) {
// Be very careful to not get tricked here.
MOZ_ASSERT(NS_IsMainThread());
if (!xpc::AccessCheck::isChrome(JS::GetCompartment(obj))) {
MOZ_CRASH("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()) {
cx.ThrowErrorMessage<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;
}
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) {
aRv.ThrowInvalidStateError("Global is not a Window");
return;
}
if (!window->IsCurrentInnerWindow()) {
aRv.ThrowInvalidStateError("Window no longer active");
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 NormalizeUSVString(nsAString& aString) {
return EnsureUTF16Validity(aString);
}
bool NormalizeUSVString(binding_detail::FakeString<char16_t>& aString) {
uint32_t upTo = Utf16ValidUpTo(aString);
uint32_t len = aString.Length();
if (upTo == len) {
return true;
}
// This is the part that's different from EnsureUTF16Validity with an
// nsAString& argument, because we don't want to ensure mutability in our
// BeginWriting() in the common case and nsAString's EnsureMutable is not
// public. This is a little annoying; I wish we could just share the more or
// less identical code!
if (!aString.EnsureMutable()) {
return false;
}
char16_t* ptr = aString.BeginWriting();
auto span = Span(ptr, len);
span[upTo] = 0xFFFD;
EnsureUtf16ValiditySpan(span.From(upTo + 1));
return true;
}
bool ConvertJSValueToByteString(BindingCallContext& cx, JS::Handle<JS::Value> v,
bool nullable, const char* sourceDescription,
nsACString& result) {
JS::Rooted<JSString*> s(cx);
if (v.isString()) {
s = v.toString();
size_t length = JS::GetStringLength(s);
if (XPCStringConvert::MaybeAssignLatin1StringChars(s, length, result)) {
return true;
}
} 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, "%zu", 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);
cx.ThrowErrorMessage<MSG_INVALID_BYTESTRING>(sourceDescription, 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;
}
if (!JS_EncodeStringToBuffer(cx, s, result.BeginWriting(), length)) {
return false;
}
return true;
}
void FinalizeGlobal(JS::GCContext* aGcx, JSObject* aObj) {
MOZ_ASSERT(JS::GetClass(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,
JS::MutableHandleVector<jsid> aProperties,
bool aEnumerableOnly) {
MOZ_ASSERT(JS_IsGlobalObject(aObj),
"Should have a global here, since we plan to enumerate standard "
"classes!");
return JS_NewEnumerateStandardClasses(aCx, aObj, aProperties,
aEnumerableOnly);
}
bool IsGlobalInExposureSet(JSContext* aCx, JSObject* aGlobal,
uint32_t aGlobalSet) {
MOZ_ASSERT(aGlobalSet, "Why did we get called?");
MOZ_ASSERT((aGlobalSet &
~(GlobalNames::Window | GlobalNames::DedicatedWorkerGlobalScope |
GlobalNames::SharedWorkerGlobalScope |
GlobalNames::ServiceWorkerGlobalScope |
GlobalNames::WorkerDebuggerGlobalScope |
GlobalNames::AudioWorkletGlobalScope |
GlobalNames::PaintWorkletGlobalScope |
GlobalNames::ShadowRealmGlobalScope)) == 0,
"Unknown global type");
const char* name = JS::GetClass(aGlobal)->name;
if ((aGlobalSet & GlobalNames::Window) &&
(!strcmp(name, "Window") || !strcmp(name, "BackstagePass"))) {
return true;
}
if ((aGlobalSet & GlobalNames::DedicatedWorkerGlobalScope) &&
!strcmp(name, "DedicatedWorkerGlobalScope")) {
return true;
}
if ((aGlobalSet & GlobalNames::SharedWorkerGlobalScope) &&
!strcmp(name, "SharedWorkerGlobalScope")) {
return true;
}
if ((aGlobalSet & GlobalNames::ServiceWorkerGlobalScope) &&
!strcmp(name, "ServiceWorkerGlobalScope")) {
return true;
}
if ((aGlobalSet & GlobalNames::WorkerDebuggerGlobalScope) &&
!strcmp(name, "WorkerDebuggerGlobalScopex")) {
return true;
}
if ((aGlobalSet & GlobalNames::AudioWorkletGlobalScope) &&
!strcmp(name, "AudioWorkletGlobalScope")) {
return true;
}
if ((aGlobalSet & GlobalNames::PaintWorkletGlobalScope) &&
!strcmp(name, "PaintWorkletGlobalScope")) {
return true;
}
if ((aGlobalSet & GlobalNames::ShadowRealmGlobalScope) &&
!strcmp(name, "ShadowRealmGlobalScope")) {
return true;
}
return false;
}
namespace binding_detail {
/**
* A ThisPolicy struct needs to provide the following methods:
*
* HasValidThisValue: Takes a CallArgs and returns a boolean indicating whether
* the thisv() is valid in the sense of being the right type
* of Value. It does not check whether it's the right sort
* of object if the Value is a JSObject*.
*
* ExtractThisObject: Takes a CallArgs for which HasValidThisValue was true and
* returns the JSObject* to use for getting |this|.
*
* MaybeUnwrapThisObject: If our |this| is a JSObject* that this policy wants to
* allow unchecked access to for this
* getter/setter/method, unwrap it. Otherwise just
* return the given object.
*
* UnwrapThisObject: Takes a MutableHandle for a JSObject which contains the
* this object (which the caller probably got from
* MaybeUnwrapThisObject). It will try to get the right native
* out of aObj. In some cases there are 2 possible types for
* the native (which is why aSelf is a reference to a void*).
* The ThisPolicy user should use the this JSObject* to
* determine what C++ class aSelf contains. aObj is used to
* keep the reflector object alive while self is being used,
* so its value before and after the UnwrapThisObject call
* could be different (if aObj was wrapped). The return value
* is an nsresult, which will signal if an error occurred.
*
* This is passed a JSContext for dynamic unwrapping purposes,
* but should not throw exceptions on that JSContext.
*
* HandleInvalidThis: If the |this| is not valid (wrong type of value, wrong
* object, etc), decide what to do about it. Returns a
* boolean to return from the JSNative (false for failure,
* true for succcess).
*/
struct NormalThisPolicy {
// This needs to be inlined because it's called on no-exceptions fast-paths.
static MOZ_ALWAYS_INLINE bool HasValidThisValue(const JS::CallArgs& aArgs) {
// Per WebIDL spec, all getters/setters/methods allow null/undefined "this"
// and coerce it to the global. Then the "is this the right interface?"
// check fails if the interface involved is not one that the global
// implements.
//
// As an optimization, we skip doing the null/undefined stuff if we know our
// interface is not implemented by the global.
return aArgs.thisv().isObject();
}
static MOZ_ALWAYS_INLINE JSObject* ExtractThisObject(
const JS::CallArgs& aArgs) {
return &aArgs.thisv().toObject();
}
static MOZ_ALWAYS_INLINE JSObject* MaybeUnwrapThisObject(JSObject* aObj) {
return aObj;
}
static MOZ_ALWAYS_INLINE nsresult UnwrapThisObject(
JS::MutableHandle<JSObject*> aObj, JSContext* aCx, void*& aSelf,
prototypes::ID aProtoID, uint32_t aProtoDepth) {
binding_detail::MutableObjectHandleWrapper wrapper(aObj);
return binding_detail::UnwrapObjectInternal<void, true>(
wrapper, aSelf, aProtoID, aProtoDepth, aCx);
}
static bool HandleInvalidThis(JSContext* aCx, const JS::CallArgs& aArgs,
bool aSecurityError, prototypes::ID aProtoId) {
return ThrowInvalidThis(aCx, aArgs, aSecurityError, aProtoId);
}
};
struct MaybeGlobalThisPolicy : public NormalThisPolicy {
static MOZ_ALWAYS_INLINE bool HasValidThisValue(const JS::CallArgs& aArgs) {
// Here we have to allow null/undefined.
return aArgs.thisv().isObject() || aArgs.thisv().isNullOrUndefined();
}
static MOZ_ALWAYS_INLINE JSObject* ExtractThisObject(
const JS::CallArgs& aArgs) {
return aArgs.thisv().isObject()
? &aArgs.thisv().toObject()
: JS::GetNonCCWObjectGlobal(&aArgs.callee());
}
// We want the MaybeUnwrapThisObject of NormalThisPolicy.
// We want the HandleInvalidThis of NormalThisPolicy.
};
// Shared LenientThis behavior for our two different LenientThis policies.
struct LenientThisPolicyMixin {
static bool HandleInvalidThis(JSContext* aCx, const JS::CallArgs& aArgs,
bool aSecurityError, prototypes::ID aProtoId) {
if (aSecurityError) {
return NormalThisPolicy::HandleInvalidThis(aCx, aArgs, aSecurityError,
aProtoId);
}
MOZ_ASSERT(!JS_IsExceptionPending(aCx));
if (!ReportLenientThisUnwrappingFailure(aCx, &aArgs.callee())) {
return false;
}
aArgs.rval().set(JS::UndefinedValue());
return true;
}
};
// There are some LenientThis things on globals, so we inherit from
// MaybeGlobalThisPolicy.
struct LenientThisPolicy : public MaybeGlobalThisPolicy,
public LenientThisPolicyMixin {
// We want the HasValidThisValue of MaybeGlobalThisPolicy.
// We want the ExtractThisObject of MaybeGlobalThisPolicy.
// We want the MaybeUnwrapThisObject of MaybeGlobalThisPolicy.
// We want HandleInvalidThis from LenientThisPolicyMixin
using LenientThisPolicyMixin::HandleInvalidThis;
};
// There are some cross-origin things on globals, so we inherit from
// MaybeGlobalThisPolicy.
struct CrossOriginThisPolicy : public MaybeGlobalThisPolicy {
// We want the HasValidThisValue of MaybeGlobalThisPolicy.
// We want the ExtractThisObject of MaybeGlobalThisPolicy.
static MOZ_ALWAYS_INLINE JSObject* MaybeUnwrapThisObject(JSObject* aObj) {
if (xpc::WrapperFactory::IsCrossOriginWrapper(aObj)) {
return js::UncheckedUnwrap(aObj);
}
// Else just return aObj; our UnwrapThisObject call will try to
// CheckedUnwrap it, and either succeed or get a security error as needed.
return aObj;
}
// After calling UnwrapThisObject aSelf can contain one of 2 types, depending
// on whether aObj is a proxy with a RemoteObjectProxy handler or a (maybe
// wrapped) normal WebIDL reflector. The generated binding code relies on this
// and uses IsRemoteObjectProxy to determine what type aSelf points to.
static MOZ_ALWAYS_INLINE nsresult UnwrapThisObject(
JS::MutableHandle<JSObject*> aObj, JSContext* aCx, void*& aSelf,
prototypes::ID aProtoID, uint32_t aProtoDepth) {
binding_detail::MutableObjectHandleWrapper wrapper(aObj);
// We need to pass false here, because if aObj doesn't have a DOMJSClass
// it might be a remote proxy object, and we don't want to throw in that
// case (even though unwrapping would fail).
nsresult rv = binding_detail::UnwrapObjectInternal<void, false>(
wrapper, aSelf, aProtoID, aProtoDepth, nullptr);
if (NS_SUCCEEDED(rv)) {
return rv;
}
if (js::IsWrapper(wrapper)) {
// We want CheckedUnwrapDynamic here: aCx represents the Realm we are in
// right now, so we want to check whether that Realm should be able to
// access the object. And this object can definitely be a WindowProxy, so
// we need he dynamic check.
JSObject* unwrappedObj = js::CheckedUnwrapDynamic(
wrapper, aCx, /* stopAtWindowProxy = */ false);
if (!unwrappedObj) {
return NS_ERROR_XPC_SECURITY_MANAGER_VETO;
}
// At this point we want to keep "unwrappedObj" alive, because we don't
// hold a strong reference in "aSelf".
wrapper = unwrappedObj;
return binding_detail::UnwrapObjectInternal<void, false>(
wrapper, aSelf, aProtoID, aProtoDepth, nullptr);
}
if (!IsRemoteObjectProxy(wrapper, aProtoID)) {
return NS_ERROR_XPC_BAD_CONVERT_JS;
}
aSelf = RemoteObjectProxyBase::GetNative(wrapper);
return NS_OK;
}
// We want the HandleInvalidThis of MaybeGlobalThisPolicy.
};
// Some objects that can be cross-origin objects are globals, so we inherit
// from MaybeGlobalThisPolicy.
struct MaybeCrossOriginObjectThisPolicy : public MaybeGlobalThisPolicy {
// We want the HasValidThisValue of MaybeGlobalThisPolicy.
// We want the ExtractThisObject of MaybeGlobalThisPolicy.
// We want the MaybeUnwrapThisObject of MaybeGlobalThisPolicy
static MOZ_ALWAYS_INLINE nsresult UnwrapThisObject(
JS::MutableHandle<JSObject*> aObj, JSContext* aCx, void*& aSelf,
prototypes::ID aProtoID, uint32_t aProtoDepth) {
// There are two cases at this point: either aObj is a cross-compartment
// wrapper (CCW) or it's not. If it is, we don't need to do anything
// special compared to MaybeGlobalThisPolicy: the CCW will do the relevant
// security checks. Which is good, because if we tried to do the
// cross-origin object check _before_ unwrapping it would always come back
// as "same-origin" and if we tried to do it after unwrapping it would be
// completely wrong: the checks rely on the two sides of the comparison
// being symmetric (can access each other or cannot access each other), but
// if we have a CCW we could have an Xray, which is asymmetric. And then
// we'd think we should deny access, whereas we should actually allow
// access.
//
// If we do _not_ have a CCW here, then we need to check whether it's a
// cross-origin-accessible object, and if it is check whether it's
// same-origin-domain with our current callee.
if (!js::IsCrossCompartmentWrapper(aObj) &&
xpc::IsCrossOriginAccessibleObject(aObj) &&
!MaybeCrossOriginObjectMixins::IsPlatformObjectSameOrigin(aCx, aObj)) {
return NS_ERROR_XPC_SECURITY_MANAGER_VETO;
}
return MaybeGlobalThisPolicy::UnwrapThisObject(aObj, aCx, aSelf, aProtoID,
aProtoDepth);
}
// We want the HandleInvalidThis of MaybeGlobalThisPolicy.
};
// And in some cases we are dealing with a maybe-cross-origin object _and_ need
// [LenientThis] behavior.
struct MaybeCrossOriginObjectLenientThisPolicy
: public MaybeCrossOriginObjectThisPolicy,
public LenientThisPolicyMixin {
// We want to get all of our behavior from
// MaybeCrossOriginObjectLenientThisPolicy, except for HandleInvalidThis,
// which should come from LenientThisPolicyMixin.
using LenientThisPolicyMixin::HandleInvalidThis;
};
/**
* An ExceptionPolicy struct provides a single HandleException method which is
* used to handle an exception, if any. The method is given the current
* success/failure boolean so it can decide whether there is in fact an
* exception involved.
*/
struct ThrowExceptions {
// This needs to be inlined because it's called even on no-exceptions
// fast-paths.
static MOZ_ALWAYS_INLINE bool HandleException(JSContext* aCx,
JS::CallArgs& aArgs,
const JSJitInfo* aInfo,
bool aOK) {
return aOK;
}
};
struct ConvertExceptionsToPromises {
// This needs to be inlined because it's called even on no-exceptions
// fast-paths.
static MOZ_ALWAYS_INLINE bool HandleException(JSContext* aCx,
JS::CallArgs& aArgs,
const JSJitInfo* aInfo,
bool aOK) {
// Promise-returning getters/methods always return objects.
MOZ_ASSERT(aInfo->returnType() == JSVAL_TYPE_OBJECT);
if (aOK) {
return true;
}
return ConvertExceptionToPromise(aCx, aArgs.rval());
}
};
template <typename ThisPolicy, typename ExceptionPolicy>
bool GenericGetter(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 (!ThisPolicy::HasValidThisValue(args)) {
bool ok = ThisPolicy::HandleInvalidThis(cx, args, false, protoID);
return ExceptionPolicy::HandleException(cx, args, info, ok);
}
JS::Rooted<JSObject*> obj(cx, ThisPolicy::ExtractThisObject(args));
// NOTE: we want to leave obj in its initial compartment, so don't want to
// pass it to UnwrapObjectInternal. Also, the thing we pass to
// UnwrapObjectInternal may be affected by our ThisPolicy.
JS::Rooted<JSObject*> rootSelf(cx, ThisPolicy::MaybeUnwrapThisObject(obj));
void* self;
{
nsresult rv =
ThisPolicy::UnwrapThisObject(&rootSelf, cx, self, protoID, info->depth);
if (NS_FAILED(rv)) {
bool ok = ThisPolicy::HandleInvalidThis(
cx, args, rv == NS_ERROR_XPC_SECURITY_MANAGER_VETO, protoID);
return ExceptionPolicy::HandleException(cx, args, info, ok);
}
}
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 ExceptionPolicy::HandleException(cx, args, info, ok);
}
// Force instantiation of the specializations of GenericGetter we need here.
template bool GenericGetter<NormalThisPolicy, ThrowExceptions>(JSContext* cx,
unsigned argc,
JS::Value* vp);
template bool GenericGetter<NormalThisPolicy, ConvertExceptionsToPromises>(
JSContext* cx, unsigned argc, JS::Value* vp);
template bool GenericGetter<MaybeGlobalThisPolicy, ThrowExceptions>(
JSContext* cx, unsigned argc, JS::Value* vp);
template bool GenericGetter<MaybeGlobalThisPolicy, ConvertExceptionsToPromises>(
JSContext* cx, unsigned argc, JS::Value* vp);
template bool GenericGetter<LenientThisPolicy, ThrowExceptions>(JSContext* cx,
unsigned argc,
JS::Value* vp);
// There aren't any [LenientThis] Promise-returning getters, so don't
// bother instantiating that specialization.
template bool GenericGetter<CrossOriginThisPolicy, ThrowExceptions>(
JSContext* cx, unsigned argc, JS::Value* vp);
// There aren't any cross-origin Promise-returning getters, so don't
// bother instantiating that specialization.
template bool GenericGetter<MaybeCrossOriginObjectThisPolicy, ThrowExceptions>(
JSContext* cx, unsigned argc, JS::Value* vp);
// There aren't any maybe-cross-origin-object Promise-returning getters, so
// don't bother instantiating that specialization.
template bool GenericGetter<MaybeCrossOriginObjectLenientThisPolicy,
ThrowExceptions>(JSContext* cx, unsigned argc,
JS::Value* vp);
// There aren't any maybe-cross-origin-object Promise-returning lenient-this
// getters, so don't bother instantiating that specialization.
template <typename ThisPolicy>
bool GenericSetter(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 (!ThisPolicy::HasValidThisValue(args)) {
return ThisPolicy::HandleInvalidThis(cx, args, false, protoID);
}
JS::Rooted<JSObject*> obj(cx, ThisPolicy::ExtractThisObject(args));
// NOTE: we want to leave obj in its initial compartment, so don't want to
// pass it to UnwrapObject. Also the thing we pass to UnwrapObjectInternal
// may be affected by our ThisPolicy.
JS::Rooted<JSObject*> rootSelf(cx, ThisPolicy::MaybeUnwrapThisObject(obj));
void* self;
{
nsresult rv =
ThisPolicy::UnwrapThisObject(&rootSelf, cx, self, protoID, info->depth);
if (NS_FAILED(rv)) {
return ThisPolicy::HandleInvalidThis(
cx, args, rv == NS_ERROR_XPC_SECURITY_MANAGER_VETO, protoID);
}
}
if (args.length() == 0) {
return ThrowNoSetterArg(cx, args, 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;
}
// Force instantiation of the specializations of GenericSetter we need here.
template bool GenericSetter<NormalThisPolicy>(JSContext* cx, unsigned argc,
JS::Value* vp);
template bool GenericSetter<MaybeGlobalThisPolicy>(JSContext* cx, unsigned argc,
JS::Value* vp);
template bool GenericSetter<LenientThisPolicy>(JSContext* cx, unsigned argc,
JS::Value* vp);
template bool GenericSetter<CrossOriginThisPolicy>(JSContext* cx, unsigned argc,
JS::Value* vp);
template bool GenericSetter<MaybeCrossOriginObjectThisPolicy>(JSContext* cx,
unsigned argc,
JS::Value* vp);
template bool GenericSetter<MaybeCrossOriginObjectLenientThisPolicy>(
JSContext* cx, unsigned argc, JS::Value* vp);
template <typename ThisPolicy, typename ExceptionPolicy>
bool GenericMethod(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 (!ThisPolicy::HasValidThisValue(args)) {
bool ok = ThisPolicy::HandleInvalidThis(cx, args, false, protoID);
return ExceptionPolicy::HandleException(cx, args, info, ok);
}
JS::Rooted<JSObject*> obj(cx, ThisPolicy::ExtractThisObject(args));
// NOTE: we want to leave obj in its initial compartment, so don't want to
// pass it to UnwrapObjectInternal. Also, the thing we pass to
// UnwrapObjectInternal may be affected by our ThisPolicy.
JS::Rooted<JSObject*> rootSelf(cx, ThisPolicy::MaybeUnwrapThisObject(obj));
void* self;
{
nsresult rv =
ThisPolicy::UnwrapThisObject(&rootSelf, cx, self, protoID, info->depth);
if (NS_FAILED(rv)) {
bool ok = ThisPolicy::HandleInvalidThis(
cx, args, rv == NS_ERROR_XPC_SECURITY_MANAGER_VETO, protoID);
return ExceptionPolicy::HandleException(cx, args, info, ok);
}
}
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 ExceptionPolicy::HandleException(cx, args, info, ok);
}
// Force instantiation of the specializations of GenericMethod we need here.
template bool GenericMethod<NormalThisPolicy, ThrowExceptions>(JSContext* cx,
unsigned argc,
JS::Value* vp);
template bool GenericMethod<NormalThisPolicy, ConvertExceptionsToPromises>(
JSContext* cx, unsigned argc, JS::Value* vp);
template bool GenericMethod<MaybeGlobalThisPolicy, ThrowExceptions>(
JSContext* cx, unsigned argc, JS::Value* vp);
template bool GenericMethod<MaybeGlobalThisPolicy, ConvertExceptionsToPromises>(
JSContext* cx, unsigned argc, JS::Value* vp);
template bool GenericMethod<CrossOriginThisPolicy, ThrowExceptions>(
JSContext* cx, unsigned argc, JS::Value* vp);
// There aren't any cross-origin Promise-returning methods, so don't
// bother instantiating that specialization.
template bool GenericMethod<MaybeCrossOriginObjectThisPolicy, ThrowExceptions>(
JSContext* cx, unsigned argc, JS::Value* vp);
template bool GenericMethod<MaybeCrossOriginObjectThisPolicy,
ConvertExceptionsToPromises>(JSContext* cx,
unsigned argc,
JS::Value* vp);
} // namespace binding_detail
bool StaticMethodPromiseWrapper(JSContext* cx, unsigned argc, JS::Value* vp) {
JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
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, args.rval());
}
bool ConvertExceptionToPromise(JSContext* cx,
JS::MutableHandle<JS::Value> rval) {
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);
return true;
}
/* static */
void CreateGlobalOptionsWithXPConnect::TraceGlobal(JSTracer* aTrc,
JSObject* aObj) {
xpc::TraceXPCGlobal(aTrc, aObj);
}
/* static */
bool CreateGlobalOptionsWithXPConnect::PostCreateGlobal(
JSContext* aCx, JS::Handle<JSObject*> aGlobal) {
JSPrincipals* principals =
JS::GetRealmPrincipals(js::GetNonCCWObjectRealm(aGlobal));
nsIPrincipal* principal = nsJSPrincipals::get(principals);
SiteIdentifier site;
nsresult rv = BasePrincipal::Cast(principal)->GetSiteIdentifier(site);
NS_ENSURE_SUCCESS(rv, false);
xpc::RealmPrivate::Init(aGlobal, site);
return true;
}
uint64_t GetWindowID(void* aGlobal) { return 0; }
uint64_t GetWindowID(nsGlobalWindowInner* aGlobal) {
return aGlobal->WindowID();
}
uint64_t GetWindowID(DedicatedWorkerGlobalScope* aGlobal) {
return aGlobal->WindowID();
}
#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) {
// Remote object proxies are not CCWs, so unwrapping them does not get you
// their "real" principal, but we want to treat them like cross-origin objects
// when considering them as WebIDL arguments, for consistency.
if (IsRemoteObjectProxy(aObject)) {
return false;
}
nsIPrincipal* objPrin =
nsContentUtils::ObjectPrincipal(js::UncheckedUnwrap(aObject));
return nsContentUtils::SubjectPrincipal()->Subsumes(objPrin);
}
nsresult UnwrapArgImpl(JSContext* cx, JS::Handle<JSObject*> src,
const nsIID& iid, void** ppArg) {
if (!NS_IsMainThread()) {
return NS_ERROR_NOT_AVAILABLE;
}
// The JSContext represents the "who is unwrapping" realm, so we want to use
// it for ReflectorToISupportsDynamic here.
nsCOMPtr<nsISupports> iface = xpc::ReflectorToISupportsDynamic(src, cx);
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::IsSystemCaller(cx)) {
return NS_ERROR_XPC_BAD_CONVERT_JS;
}
RefPtr<nsXPCWrappedJS> wrappedJS;
nsresult rv =
nsXPCWrappedJS::GetNewOrUsed(cx, 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 UnwrapWindowProxyArg(JSContext* cx, JS::Handle<JSObject*> src,
WindowProxyHolder& ppArg) {
if (IsRemoteObjectProxy(src, prototypes::id::Window)) {
ppArg =
static_cast<BrowsingContext*>(RemoteObjectProxyBase::GetNative(src));
return NS_OK;
}
nsCOMPtr<nsPIDOMWindowInner> inner;
nsresult rv = UnwrapArg<nsPIDOMWindowInner>(cx, src, getter_AddRefs(inner));
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsPIDOMWindowOuter> outer = inner->GetOuterWindow();
RefPtr<BrowsingContext> bc = outer ? outer->GetBrowsingContext() : nullptr;
ppArg = std::move(bc);
return NS_OK;
}
template <auto Method, typename... Args>
static bool GetBackingObject(JSContext* aCx, JS::Handle<JSObject*> aObj,
size_t aSlotIndex,
JS::MutableHandle<JSObject*> aBackingObj,
bool* aBackingObjCreated, Args... aArgs) {
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 realms,
// make sure to create the backing object in reflector realm.
{
JSAutoRealm ar(aCx, reflector);
JS::Rooted<JSObject*> newBackingObj(aCx);
newBackingObj.set(Method(aCx, aArgs...));
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 GetBackingObject<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 GetBackingObject<JS::NewSetObject>(aCx, aObj, aSlotIndex, aBackingObj,
aBackingObjCreated);
}
static inline JSObject* NewObservableArrayProxyObject(
JSContext* aCx, const ObservableArrayProxyHandler* aHandler, void* aOwner) {
JS::Rooted<JSObject*> target(aCx, JS::NewArrayObject(aCx, 0));
if (NS_WARN_IF(!target)) {
return nullptr;
}
JS::Rooted<JS::Value> targetValue(aCx, JS::ObjectValue(*target));
JS::Rooted<JSObject*> proxy(
aCx, js::NewProxyObject(aCx, aHandler, targetValue, nullptr));
if (!proxy) {
return nullptr;
}
js::SetProxyReservedSlot(proxy, OBSERVABLE_ARRAY_DOM_INTERFACE_SLOT,
JS::PrivateValue(aOwner));
return proxy;
}
bool GetObservableArrayBackingObject(
JSContext* aCx, JS::Handle<JSObject*> aObj, size_t aSlotIndex,
JS::MutableHandle<JSObject*> aBackingObj, bool* aBackingObjCreated,
const ObservableArrayProxyHandler* aHandler, void* aOwner) {
return GetBackingObject<NewObservableArrayProxyObject>(
aCx, aObj, aSlotIndex, aBackingObj, aBackingObjCreated, aHandler, aOwner);
}
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::RootedVector<JS::Value> 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) {
if (IsDOMConstructor(aNewTarget)) {
return GetNativePropertyHooksFromJSNative(aNewTarget)->mPrototypeID;
}
return prototypes::id::_ID_Count;
}
bool GetDesiredProto(JSContext* aCx, const JS::CallArgs& aCallArgs,
prototypes::id::ID aProtoId,
CreateInterfaceObjectsMethod aCreator,
JS::MutableHandle<JSObject*> aDesiredProto) {
// This basically implements
// step 3.
MOZ_ASSERT(aCallArgs.isConstructing(), "How did we end up here?");
// 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());
MOZ_ASSERT(JS::IsCallable(newTarget));
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. CheckedUnwrapStatic is fine here, because we're looking for
// DOM constructors and those can't be cross-origin objects.
newTarget = js::CheckedUnwrapStatic(newTarget);
if (newTarget && newTarget != originalNewTarget) {
protoID = GetProtoIdForNewtarget(newTarget);
}
}
if (protoID != prototypes::id::_ID_Count) {
ProtoAndIfaceCache& protoAndIfaceCache =
*GetProtoAndIfaceCache(JS::GetNonCCWObjectGlobal(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 determine the fallback based on the proto id we
// were handed.
//
// 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.
// We can't use GetJSIDByIndex, because that only works on the main thread,
// not workers.
JS::Rooted<JS::Value> protoVal(aCx);
if (!JS_GetProperty(aCx, originalNewTarget, "prototype", &protoVal)) {
return false;
}
if (protoVal.isObject()) {
aDesiredProto.set(&protoVal.toObject());
return true;
}
// Fall back to getting the proto for our given proto id in the realm that
// GetFunctionRealm(newTarget) returns.
JS::Rooted<JS::Realm*> realm(aCx, JS::GetFunctionRealm(aCx, newTarget));
if (!realm) {
return false;
}
{
// JS::GetRealmGlobalOrNull should not be returning null here, because we
// have live objects in the Realm.
JSAutoRealm ar(aCx, JS::GetRealmGlobalOrNull(realm));
aDesiredProto.set(GetPerInterfaceObjectHandle(
aCx, aProtoId, aCreator, DefineInterfaceProperty::CheckExposure));
if (!aDesiredProto) {
return false;
}
}
return MaybeWrapObject(aCx, aDesiredProto);
}
namespace {
class MOZ_RAII AutoConstructionDepth final {
public:
MOZ_IMPLICIT AutoConstructionDepth(CustomElementDefinition* aDefinition)
: mDefinition(aDefinition) {
MOZ_ASSERT(mDefinition->mConstructionStack.IsEmpty());
mDefinition->mConstructionDepth++;
// If the mConstructionDepth isn't matched with the length of mPrefixStack,
// this means the constructor is called directly from JS, i.e.
// 'new CustomElementConstructor()', we have to push a dummy prefix into
// stack.
if (mDefinition->mConstructionDepth > mDefinition->mPrefixStack.Length()) {
mDidPush = true;
mDefinition->mPrefixStack.AppendElement(nullptr);
}
MOZ_ASSERT(mDefinition->mConstructionDepth ==
mDefinition->mPrefixStack.Length());
}
~AutoConstructionDepth() {
MOZ_ASSERT(mDefinition->mConstructionDepth > 0);
MOZ_ASSERT(mDefinition->mConstructionDepth ==
mDefinition->mPrefixStack.Length());
if (mDidPush) {
MOZ_ASSERT(mDefinition->mPrefixStack.LastElement() == nullptr);
mDefinition->mPrefixStack.RemoveLastElement();
}
mDefinition->mConstructionDepth--;
}
private:
CustomElementDefinition* mDefinition;
bool mDidPush = false;
};
} // anonymous namespace
namespace binding_detail {
bool HTMLConstructor(JSContext* aCx, unsigned aArgc, JS::Value* aVp,
constructors::id::ID aConstructorId,
prototypes::id::ID aProtoId,
CreateInterfaceObjectsMethod aCreator) {
JS::CallArgs args = JS::CallArgsFromVp(aArgc, aVp);
// Per spec, this is technically part of step 3, but doing the check
// directly lets us provide a better error message. And then in
// step 2 we can work with newTarget in a simpler way because we
// know it's an object.
if (!args.isConstructing()) {
return ThrowConstructorWithoutNew(aCx,
NamesOfInterfacesWithProtos(aProtoId));
}
JS::Rooted<JSObject*> callee(aCx, &args.callee());
// 'callee' is not a function here; it's either an Xray for our interface
// object or the interface object itself. So caling XrayAwareCalleeGlobal on
// it is not safe. But since in the Xray case it's a wrapper for our
// interface object, we can just construct our GlobalObject from it and end
// up with the right thing.
GlobalObject global(aCx, callee);
if (global.Failed()) {
return false;
}
// Now we start the [HTMLConstructor] algorithm steps from
ErrorResult rv;
auto scopeExit =
MakeScopeExit([&]() { Unused << rv.MaybeSetPendingException(aCx); });
// Step 1.
nsCOMPtr<nsPIDOMWindowInner> window =
do_QueryInterface(global.GetAsSupports());
if (!window) {
// This means we ended up with an HTML Element interface object defined in
// a non-Window scope. That's ... pretty unexpected.
rv.Throw(NS_ERROR_UNEXPECTED);
return false;
}
RefPtr<mozilla::dom::CustomElementRegistry> registry(
window->CustomElements());
// Technically, per spec, a window always has a document. In Gecko, a
// sufficiently torn-down window might not, so check for that case. We're
// going to need a document to create an element.
Document* doc = window->GetExtantDoc();
if (!doc) {
rv.Throw(NS_ERROR_UNEXPECTED);
return false;
}
// Step 2.
// The newTarget might be a cross-compartment wrapper. Get the underlying
// object so we can do the spec's object-identity checks. If we ever stop
// unwrapping here, carefully audit uses of newTarget below!
//
// Note that the ES spec enforces that newTarget is always a constructor (in
// the sense of having a [[Construct]]), so it's not a cross-origin object and
// we can use CheckedUnwrapStatic.
JS::Rooted<JSObject*> newTarget(
aCx, js::CheckedUnwrapStatic(&args.newTarget().toObject()));
if (!newTarget) {
rv.ThrowTypeError<MSG_ILLEGAL_CONSTRUCTOR>();
return false;
}
// Enter the compartment of our underlying newTarget object, so we end
// up comparing to the constructor object for our interface from that global.
// XXXbz This is not what the spec says to do, and it's not super-clear to me
// at this point why we're doing it. Why not just compare |newTarget| and
// |callee| if the intent is just to prevent registration of HTML interface
// objects as constructors? Of course it's not clear that the spec check
// makes sense to start with: https://github.com/whatwg/html/issues/3575
{
JSAutoRealm ar(aCx, newTarget);
JS::Handle<JSObject*> constructor = GetPerInterfaceObjectHandle(
aCx, aConstructorId, aCreator, DefineInterfaceProperty::CheckExposure);
if (!constructor) {
return false;
}
if (newTarget == constructor) {
rv.ThrowTypeError<MSG_ILLEGAL_CONSTRUCTOR>();
return false;
}
}
// Step 3.
CustomElementDefinition* definition =
registry->LookupCustomElementDefinition(aCx, newTarget);
if (!definition) {
rv.ThrowTypeError<MSG_ILLEGAL_CONSTRUCTOR>();
return false;
}
// Steps 4, 5, 6 do some sanity checks on our callee. We add to those a
// determination of what sort of element we're planning to construct.
// Technically, this should happen (implicitly) in step 8, but this
// determination is side-effect-free, so it's OK.
int32_t ns = definition->mNamespaceID;
constructorGetterCallback cb = nullptr;
if (ns == kNameSpaceID_XUL) {
if (definition->mLocalName == nsGkAtoms::description ||
definition->mLocalName == nsGkAtoms::label) {
cb = XULTextElement_Binding::GetConstructorObjectHandle;
} else if (definition->mLocalName == nsGkAtoms::resizer) {
cb = XULResizerElement_Binding::GetConstructorObjectHandle;
} else if (definition->mLocalName == nsGkAtoms::menupopup ||
definition->mLocalName == nsGkAtoms::panel ||
definition->mLocalName == nsGkAtoms::tooltip) {
cb = XULPopupElement_Binding::GetConstructorObjectHandle;
} else if (definition->mLocalName == nsGkAtoms::iframe ||
definition->mLocalName == nsGkAtoms::browser ||
definition->mLocalName == nsGkAtoms::editor) {
cb = XULFrameElement_Binding::GetConstructorObjectHandle;
} else if (definition->mLocalName == nsGkAtoms::menu ||
definition->mLocalName == nsGkAtoms::menulist) {
cb = XULMenuElement_Binding::GetConstructorObjectHandle;
} else if (definition->mLocalName == nsGkAtoms::tree) {
cb = XULTreeElement_Binding::GetConstructorObjectHandle;
} else {
cb = XULElement_Binding::GetConstructorObjectHandle;
}
}
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 or extend from XULElement.
if (!cb) {
cb = HTMLElement_Binding::GetConstructorObjectHandle;
}
// We want to get the constructor from our global's realm, not the
// caller realm.
JSAutoRealm ar(aCx, global.Get());
JS::Rooted<JSObject*> constructor(aCx, cb(aCx));
// CheckedUnwrapStatic is OK here, since our callee is callable, hence not a
// cross-origin object.
if (constructor != js::CheckedUnwrapStatic(callee)) {
rv.ThrowTypeError<MSG_ILLEGAL_CONSTRUCTOR>();
return false;
}
} else {
if (ns == kNameSpaceID_XHTML) {
// Step 5.
// If the definition is for a customized built-in element, the localName
// should be one of the ones defined in the specification for this
// interface.
tag = nsHTMLTags::CaseSensitiveAtomTagToId(definition->mLocalName);
if (tag == eHTMLTag_userdefined) {
rv.ThrowTypeError<MSG_ILLEGAL_CONSTRUCTOR>();
return false;
}
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.
cb = sConstructorGetterCallback[tag];
}
if (!cb) {
rv.ThrowTypeError<MSG_ILLEGAL_CONSTRUCTOR>();
return false;
}
// We want to get the constructor from our global's realm, not the
// caller realm.
JSAutoRealm ar(aCx, global.Get());
JS::Rooted<JSObject*> constructor(aCx, cb(aCx));
if (!constructor) {
return false;
}
// CheckedUnwrapStatic is OK here, since our callee is callable, hence not a
// cross-origin object.
if (constructor != js::CheckedUnwrapStatic(callee)) {
rv.ThrowTypeError<MSG_ILLEGAL_CONSTRUCTOR>();
return false;
}
}
// Steps 7 and 8.
JS::Rooted<JSObject*> desiredProto(aCx);
if (!GetDesiredProto(aCx, args, aProtoId, aCreator, &desiredProto)) {
return false;
}
MOZ_ASSERT(desiredProto, "How could we not have a prototype by now?");
// We need to do some work to actually return an Element, so we do step 8 on
// one branch and steps 9-12 on another branch, then common up the "return
// element" work.
RefPtr<Element> element;
nsTArray<RefPtr<Element>>& constructionStack = definition->mConstructionStack;
if (constructionStack.IsEmpty()) {
// Step 8.
// Now we go to construct an element. We want to do this in global's
// realm, not caller realm (the normal constructor behavior),
// just in case those elements create JS things.
JSAutoRealm ar(aCx, global.Get());
AutoConstructionDepth acd(definition);
RefPtr<NodeInfo> nodeInfo = doc->NodeInfoManager()->GetNodeInfo(
definition->mLocalName, definition->mPrefixStack.LastElement(), ns,
nsINode::ELEMENT_NODE);
MOZ_ASSERT(nodeInfo);
if (ns == kNameSpaceID_XUL) {
element = nsXULElement::Construct(nodeInfo.forget());
} else {
if (tag == eHTMLTag_userdefined) {
// Autonomous custom element.
element = NS_NewHTMLElement(nodeInfo.forget());
} else {
// Customized built-in element.
element = CreateHTMLElement(tag, nodeInfo.forget(), NOT_FROM_PARSER);
}
}
element->SetCustomElementData(MakeUnique<CustomElementData>(
definition->mType, CustomElementData::State::eCustom));
element->SetCustomElementDefinition(definition);
} else {
// Step 9.
element = constructionStack.LastElement();
// Step 10.
if (element == ALREADY_CONSTRUCTED_MARKER) {
rv.ThrowTypeError(
"Cannot instantiate a custom element inside its own constructor "
"during upgrades");
return false;
}
// 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, we will
// create it with the right proto (by calling GetOrCreateDOMReflector with
// that proto), and will preserve it by means of the proto != canonicalProto
// check).
JS::Rooted<JSObject*> reflector(aCx, element->GetWrapper());
if (reflector) {
// reflector might be in different realm.
JSAutoRealm ar(aCx, reflector);
JS::Rooted<JSObject*> givenProto(aCx, desiredProto);
if (!JS_WrapObject(aCx, &givenProto) ||
!JS_SetPrototype(aCx, reflector, givenProto)) {
return false;
}
PreserveWrapper(element.get());
}
// Step 12.
constructionStack.LastElement() = ALREADY_CONSTRUCTED_MARKER;
}
// Tail end of step 8 and step 13: returning the element. We want to do this
// part in the global's realm, though in practice it won't matter much
// because Element always knows which realm it should be created in.
JSAutoRealm ar(aCx, global.Get());
if (!js::IsObjectInContextCompartment(desiredProto, aCx) &&
!JS_WrapObject(aCx, &desiredProto)) {
return false;
}
return GetOrCreateDOMReflector(aCx, element, args.rval(), desiredProto);
}
} // namespace binding_detail
#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);
JSAutoRealm ar(aCx, reflector);
JS::Rooted<JSObject*> reflectorProto(aCx);
bool ok = JS_GetPrototype(aCx, reflector, &reflectorProto);
MOZ_ASSERT(ok);
// aGivenProto may not be in the right realm here, so we
// have to wrap it to compare.
JS::Rooted<JSObject*> givenProto(aCx, aGivenProto);
ok = JS_WrapObject(aCx, &givenProto);
MOZ_ASSERT(ok);
MOZ_ASSERT(givenProto == reflectorProto,
"How are we supposed to change the proto now?");
}
} // namespace binding_detail
#endif // DEBUG
void SetUseCounter(JSObject* aObject, UseCounter aUseCounter) {
nsGlobalWindowInner* win =
xpc::WindowGlobalOrNull(js::UncheckedUnwrap(aObject));
if (win && win->GetDocument()) {
win->GetDocument()->SetUseCounter(aUseCounter);
}
}
void SetUseCounter(UseCounterWorker aUseCounter) {
// If this is called from Worklet thread, workerPrivate will be null.
WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
if (workerPrivate) {
workerPrivate->SetUseCounter(aUseCounter);
}
}
namespace {
#define DEPRECATED_OPERATION(_op) #_op,
static const char* kDeprecatedOperations[] = {
#include "nsDeprecatedOperationList.h"
nullptr};
#undef DEPRECATED_OPERATION
void ReportDeprecation(nsIGlobalObject* aGlobal, Document* aDoc, nsIURI* aURI,
DeprecatedOperations aOperation,
const nsACString& aFileName,
const Nullable<uint32_t>& aLineNumber,
const Nullable<uint32_t>& aColumnNumber) {
MOZ_ASSERT(aURI);
// If the URI has the data scheme, report that instead of the spec,
// as the spec may be arbitrarily long and we would like to avoid
// copying it.
nsAutoCString specOrScheme;
nsresult rv = nsContentUtils::AnonymizeURI(aURI, specOrScheme);
if (NS_WARN_IF(NS_FAILED(rv))) {
return;
}
nsAutoString type;
type.AssignASCII(kDeprecatedOperations[static_cast<size_t>(aOperation)]);
nsAutoCString key;
key.AssignASCII(kDeprecatedOperations[static_cast<size_t>(aOperation)]);
key.AppendASCII("Warning");
nsAutoString msg;
rv = nsContentUtils::GetMaybeLocalizedString(nsContentUtils::eDOM_PROPERTIES,
key.get(), aDoc, msg);
if (NS_WARN_IF(NS_FAILED(rv))) {
return;
}
RefPtr<DeprecationReportBody> body =
new DeprecationReportBody(aGlobal, type, nullptr /* date */, msg,
aFileName, aLineNumber, aColumnNumber);
ReportingUtils::Report(aGlobal, nsGkAtoms::deprecation, u"default"_ns,
NS_ConvertUTF8toUTF16(specOrScheme), body);
}
// 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 {
const DeprecatedOperations mOperation;
public:
explicit DeprecationWarningRunnable(DeprecatedOperations aOperation)
: mOperation(aOperation) {}
private:
void RunOnMainThread(WorkerPrivate* aWorkerPrivate) override {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aWorkerPrivate);
nsPIDOMWindowInner* window = aWorkerPrivate->GetAncestorWindow();
if (window && window->GetExtantDoc()) {
window->GetExtantDoc()->WarnOnceAbout(mOperation);
}
}
void RunBackOnWorkerThreadForCleanup(WorkerPrivate* aWorkerPrivate) override {
}
};
void MaybeShowDeprecationWarning(const GlobalObject& aGlobal,
DeprecatedOperations aOperation) {
if (NS_IsMainThread()) {
nsCOMPtr<nsPIDOMWindowInner> window =
do_QueryInterface(aGlobal.GetAsSupports());
if (window && window->GetExtantDoc()) {
window->GetExtantDoc()->WarnOnceAbout(aOperation);
}
return;
}
WorkerPrivate* workerPrivate = GetWorkerPrivateFromContext(aGlobal.Context());
if (!workerPrivate) {
return;
}
RefPtr<DeprecationWarningRunnable> runnable =
new DeprecationWarningRunnable(aOperation);
runnable->Dispatch(workerPrivate);
}
void MaybeReportDeprecation(const GlobalObject& aGlobal,
DeprecatedOperations aOperation) {
nsCOMPtr<nsIURI> uri;
nsCOMPtr<Document> doc;
if (NS_IsMainThread()) {
nsCOMPtr<nsPIDOMWindowInner> window =
do_QueryInterface(aGlobal.GetAsSupports());
if (!window || !window->GetExtantDoc()) {
return;
}
doc = window->GetExtantDoc();
uri = doc->GetDocumentURI();
} else {
WorkerPrivate* workerPrivate =
GetWorkerPrivateFromContext(aGlobal.Context());
if (!workerPrivate) {
return;
}
uri = workerPrivate->GetResolvedScriptURI();
}
if (NS_WARN_IF(!uri)) {
return;
}
auto location = JSCallingLocation::Get(aGlobal.Context());
Nullable<uint32_t> lineNumber;
Nullable<uint32_t> columnNumber;
if (location) {
lineNumber.SetValue(location.mLine);
columnNumber.SetValue(location.mColumn);
}
nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(aGlobal.GetAsSupports());
MOZ_ASSERT(global);
ReportDeprecation(global, doc, uri, aOperation, location.FileName(),
lineNumber, columnNumber);
}
} // anonymous namespace
void DeprecationWarning(JSContext* aCx, JSObject* aObject,
DeprecatedOperations aOperation) {
GlobalObject global(aCx, aObject);
if (global.Failed()) {
NS_ERROR("Could not create global for DeprecationWarning");
return;
}
DeprecationWarning(global, aOperation);
}
void DeprecationWarning(const GlobalObject& aGlobal,
DeprecatedOperations aOperation) {
MaybeShowDeprecationWarning(aGlobal, aOperation);
MaybeReportDeprecation(aGlobal, aOperation);
}
namespace binding_detail {
JSObject* UnprivilegedJunkScopeOrWorkerGlobal(const fallible_t&) {
if (NS_IsMainThread()) {
return xpc::UnprivilegedJunkScope(fallible);
}
return GetCurrentThreadWorkerGlobal();
}
} // namespace binding_detail
JS::Handle<JSObject*> GetPerInterfaceObjectHandle(
JSContext* aCx, size_t aSlotId, CreateInterfaceObjectsMethod aCreator,
DefineInterfaceProperty aDefineOnGlobal) {
/* Make sure our global is sane. Hopefully we can remove this sometime */
JSObject* global = JS::CurrentGlobalOrNull(aCx);
if (!(JS::GetClass(global)->flags & JSCLASS_DOM_GLOBAL)) {
return nullptr;
}
/* Check to see whether the interface objects are already installed */
ProtoAndIfaceCache& protoAndIfaceCache = *GetProtoAndIfaceCache(global);
if (!protoAndIfaceCache.HasEntryInSlot(aSlotId)) {
JS::Rooted<JSObject*> rootedGlobal(aCx, global);
aCreator(aCx, rootedGlobal, protoAndIfaceCache, aDefineOnGlobal);
}
/*
* The object might _still_ be null, but that's OK.
*
* Calling fromMarkedLocation() is safe because protoAndIfaceCache is
* traced by TraceProtoAndIfaceCache() and its contents are never
* changed after they have been set.
*
* Calling address() avoids the read barrier that does gray unmarking, but
* it's not possible for the object to be gray here.
*/
const JS::Heap<JSObject*>& entrySlot =
protoAndIfaceCache.EntrySlotMustExist(aSlotId);
JS::AssertObjectIsNotGray(entrySlot);
return JS::Handle<JSObject*>::fromMarkedLocation(entrySlot.unsafeAddress());
}
namespace binding_detail {
bool IsGetterEnabled(JSContext* aCx, JS::Handle<JSObject*> aObj,
JSJitGetterOp aGetter,
const Prefable<const JSPropertySpec>* aAttributes) {
MOZ_ASSERT(aAttributes);
MOZ_ASSERT(aAttributes->specs);
do {
if (aAttributes->isEnabled(aCx, aObj)) {
const JSPropertySpec* specs = aAttributes->specs;
do {
if (!specs->isAccessor() || specs->isSelfHosted()) {
// It won't have a JSJitGetterOp.
continue;
}
const JSJitInfo* info = specs->u.accessors.getter.native.info;
if (!info) {
continue;
}
MOZ_ASSERT(info->type() == JSJitInfo::OpType::Getter);
if (info->getter == aGetter) {
return true;
}
} while ((++specs)->name);
}
} while ((++aAttributes)->specs);
// Didn't find it.
return false;
}
already_AddRefed<Promise> CreateRejectedPromiseFromThrownException(
JSContext* aCx, ErrorResult& aError) {
if (!JS_IsExceptionPending(aCx)) {
// 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. Promise::RejectWithExceptionFromContext also checks this, but
// we want to bail out here before trying to get the globals.
aError.ThrowUncatchableException();
return nullptr;
}
GlobalObject promiseGlobal(aCx, GetEntryGlobal()->GetGlobalJSObject());
if (promiseGlobal.Failed()) {
aError.StealExceptionFromJSContext(aCx);
return nullptr;
}
nsCOMPtr<nsIGlobalObject> global =
do_QueryInterface(promiseGlobal.GetAsSupports());
if (!global) {
aError.Throw(NS_ERROR_UNEXPECTED);
return nullptr;
}
return Promise::RejectWithExceptionFromContext(global, aCx, aError);
}
/* static */
void ReflectedHTMLAttributeSlotsBase::ForEachXrayReflectedHTMLAttributeSlots(
JS::RootingContext* aCx, JSObject* aObject, size_t aSlotIndex,
size_t aArrayIndex, void (*aFunc)(void* aSlots, size_t aArrayIndex)) {
xpc::ForEachXrayExpandoObject(
aCx, aObject, [aSlotIndex, aFunc, aArrayIndex](JSObject* aExpandObject) {
MOZ_ASSERT(JSCLASS_RESERVED_SLOTS(JS::GetClass(aExpandObject)) >
aSlotIndex);
MOZ_ASSERT(aSlotIndex >= DOM_EXPANDO_RESERVED_SLOTS);
JS::Value array = JS::GetReservedSlot(aExpandObject, aSlotIndex);
if (!array.isUndefined()) {
aFunc(array.toPrivate(), aArrayIndex);
}
});
}
/* static */
void ReflectedHTMLAttributeSlotsBase::XrayExpandoObjectFinalize(
JS::GCContext* aCx, JSObject* aObject) {
xpc::ExpandoObjectFinalize(aCx, aObject);
}
void ClearXrayExpandoSlots(JS::RootingContext* aCx, JSObject* aObject,
size_t aSlotIndex) {
xpc::ForEachXrayExpandoObject(
aCx, aObject, [aSlotIndex](JSObject* aExpandObject) {
MOZ_ASSERT(JSCLASS_RESERVED_SLOTS(JS::GetClass(aExpandObject)) >
aSlotIndex);
MOZ_ASSERT(aSlotIndex >= DOM_EXPANDO_RESERVED_SLOTS);
JS::SetReservedSlot(aExpandObject, aSlotIndex, JS::UndefinedValue());
});
}
} // namespace binding_detail
static_assert(UnderlyingValue(DOM_EXPANDO_RESERVED_SLOTS) ==
UnderlyingValue(xpc::JSSLOT_EXPANDO_COUNT));
} // namespace dom
} // namespace mozilla