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-rw-r--r--dom/bindings/BindingUtils.cpp4303
1 files changed, 4303 insertions, 0 deletions
diff --git a/dom/bindings/BindingUtils.cpp b/dom/bindings/BindingUtils.cpp
new file mode 100644
index 0000000000..4cccda7a4b
--- /dev/null
+++ b/dom/bindings/BindingUtils.cpp
@@ -0,0 +1,4303 @@
+/* -*- 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 GetConstructorObject methods.
+#define HTML_TAG(_tag, _classname, _interfacename) \
+ namespace HTML##_interfacename##Element_Binding { \
+ JSObject* GetConstructorObject(JSContext*); \
+ }
+#define HTML_OTHER(_tag)
+#include "nsHTMLTagList.h"
+#undef HTML_TAG
+#undef HTML_OTHER
+
+using constructorGetterCallback = JSObject* (*)(JSContext*);
+
+// Mapping of html tag and GetConstructorObject methods.
+#define HTML_TAG(_tag, _classname, _interfacename) \
+ HTML##_interfacename##Element_Binding::GetConstructorObject,
+#define HTML_OTHER(_tag) nullptr,
+// We use eHTMLTag_foo (where foo is the tag) which is defined in nsHTMLTags.h
+// to index into this array.
+static const constructorGetterCallback sConstructorGetterCallback[] = {
+ HTMLUnknownElement_Binding::GetConstructorObject,
+#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 < ArrayLength(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()) {
+ // Nuke any existing exception on cx, to make sure we're uncatchable.
+ JS_ClearPendingException(cx);
+ // Don't do any reporting. Just return, to create an
+ // uncatchable exception.
+ mResult = NS_OK;
+ return;
+ }
+ if (IsJSContextException()) {
+ // Whatever we need to throw is on the JSContext already.
+ MOZ_ASSERT(JS_IsExceptionPending(cx));
+ mResult = NS_OK;
+ return;
+ }
+ if (IsErrorWithMessage()) {
+ SetPendingExceptionWithMessage(cx, 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);
+}
+
+// We should use JSFunction objects for interface objects, but we need a custom
+// hasInstance hook because we have new interface objects on prototype chains of
+// old (XPConnect-based) bindings. We also need Xrays and arbitrary numbers of
+// reserved slots (e.g. for legacy factory functions). So we define a custom
+// funToString ObjectOps member for interface objects.
+JSString* InterfaceObjectToString(JSContext* aCx, JS::Handle<JSObject*> aObject,
+ bool /* isToSource */) {
+ const JSClass* clasp = JS::GetClass(aObject);
+ MOZ_ASSERT(IsDOMIfaceAndProtoClass(clasp));
+
+ const DOMIfaceJSClass* ifaceJSClass = DOMIfaceJSClass::FromJSClass(clasp);
+ return JS_NewStringCopyZ(aCx, ifaceJSClass->mFunToString);
+}
+
+bool Constructor(JSContext* cx, unsigned argc, JS::Value* vp) {
+ JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
+ const JS::Value& v = js::GetFunctionNativeReserved(
+ &args.callee(), CONSTRUCTOR_NATIVE_HOLDER_RESERVED_SLOT);
+ const JSNativeHolder* nativeHolder =
+ static_cast<const JSNativeHolder*>(v.toPrivate());
+ return (nativeHolder->mNative)(cx, argc, vp);
+}
+
+static JSObject* CreateConstructor(JSContext* cx, JS::Handle<JSObject*> global,
+ const char* name,
+ const JSNativeHolder* nativeHolder,
+ unsigned ctorNargs) {
+ JSFunction* fun = js::NewFunctionWithReserved(cx, Constructor, ctorNargs,
+ JSFUN_CONSTRUCTOR, name);
+ if (!fun) {
+ return nullptr;
+ }
+
+ JSObject* constructor = JS_GetFunctionObject(fun);
+ js::SetFunctionNativeReserved(
+ constructor, CONSTRUCTOR_NATIVE_HOLDER_RESERVED_SLOT,
+ JS::PrivateValue(const_cast<JSNativeHolder*>(nativeHolder)));
+ return constructor;
+}
+
+static bool DefineConstructor(JSContext* cx, JS::Handle<JSObject*> global,
+ 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" doesn't have a DOMIfaceAndProtoJSClass, it's not a DOM
+ // constructor, so just fall back. 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 DOM constructors, 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;
+ }
+
+ const JSClass* thisClass = JS::GetClass(thisObj);
+
+ if (!IsDOMIfaceAndProtoClass(thisClass)) {
+ args.rval().setBoolean(false);
+ return true;
+ }
+
+ const DOMIfaceAndProtoJSClass* clasp =
+ DOMIfaceAndProtoJSClass::FromJSClass(thisClass);
+
+ // If "this" isn't a DOM constructor or is a constructor for an interface
+ // without a prototype, just fall back.
+ if (clasp->mType != eInterface ||
+ clasp->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[clasp->mDepth] == clasp->mPrototypeID) {
+ args.rval().setBoolean(true);
+ return true;
+ }
+
+ if (IsRemoteObjectProxy(instance, clasp->mPrototypeID)) {
+ args.rval().setBoolean(true);
+ return true;
+ }
+
+ args.rval().setBoolean(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*> constructorProto,
+ const DOMIfaceJSClass* constructorClass, unsigned ctorNargs,
+ 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,
+ bool isNamespace) {
+ JS::Rooted<JSObject*> constructor(cx);
+ MOZ_ASSERT(constructorProto);
+ MOZ_ASSERT(constructorClass);
+ constructor = JS_NewObjectWithGivenProto(cx, constructorClass->ToJSClass(),
+ constructorProto);
+ if (!constructor) {
+ return nullptr;
+ }
+
+ if (!isNamespace) {
+ if (!JS_DefineProperty(cx, constructor, "length", ctorNargs,
+ JSPROP_READONLY)) {
+ return nullptr;
+ }
+
+ if (!JS_DefineProperty(cx, constructor, "name", name, JSPROP_READONLY)) {
+ return nullptr;
+ }
+ }
+
+ if (constructorClass->wantsInterfaceIsInstance && isChrome &&
+ !JS_DefineFunction(cx, constructor, "isInstance", InterfaceIsInstance, 1,
+ // Don't bother making it enumerable
+ 0)) {
+ return nullptr;
+ }
+
+ if (properties) {
+ if (properties->HasStaticMethods() &&
+ !DefinePrefable(cx, constructor, properties->StaticMethods())) {
+ return nullptr;
+ }
+
+ if (properties->HasStaticAttributes() &&
+ !DefinePrefable(cx, constructor, properties->StaticAttributes())) {
+ return nullptr;
+ }
+
+ if (properties->HasConstants() &&
+ !DefinePrefable(cx, constructor, properties->Constants())) {
+ return nullptr;
+ }
+ }
+
+ if (chromeOnlyProperties && isChrome) {
+ if (chromeOnlyProperties->HasStaticMethods() &&
+ !DefinePrefable(cx, constructor,
+ chromeOnlyProperties->StaticMethods())) {
+ return nullptr;
+ }
+
+ if (chromeOnlyProperties->HasStaticAttributes() &&
+ !DefinePrefable(cx, constructor,
+ chromeOnlyProperties->StaticAttributes())) {
+ return nullptr;
+ }
+
+ if (chromeOnlyProperties->HasConstants() &&
+ !DefinePrefable(cx, constructor, chromeOnlyProperties->Constants())) {
+ return nullptr;
+ }
+ }
+
+ if (isNamespace && !DefineToStringTag(cx, constructor, name)) {
+ return nullptr;
+ }
+
+ if (proto && !JS_LinkConstructorAndPrototype(cx, constructor, proto)) {
+ return nullptr;
+ }
+
+ JS::Rooted<jsid> nameStr(cx, JS::PropertyKey::NonIntAtom(name));
+ if (defineOnGlobal && !DefineConstructor(cx, global, nameStr, constructor)) {
+ return nullptr;
+ }
+
+ if (legacyWindowAliases && NS_IsMainThread()) {
+ for (; *legacyWindowAliases; ++legacyWindowAliases) {
+ if (!DefineConstructor(cx, global, *legacyWindowAliases, constructor)) {
+ return nullptr;
+ }
+ }
+ }
+
+ if (legacyFactoryFunctions) {
+ int legacyFactoryFunctionSlot = DOM_INTERFACE_SLOTS_BASE;
+ while (legacyFactoryFunctions->mName) {
+ JS::Rooted<JSObject*> legacyFactoryFunction(
+ cx, CreateConstructor(cx, global, legacyFactoryFunctions->mName,
+ &legacyFactoryFunctions->mHolder,
+ legacyFactoryFunctions->mNargs));
+ if (!legacyFactoryFunction ||
+ !JS_DefineProperty(cx, legacyFactoryFunction, "prototype", proto,
+ JSPROP_PERMANENT | JSPROP_READONLY) ||
+ (defineOnGlobal &&
+ !DefineConstructor(cx, global, legacyFactoryFunctions->mName,
+ legacyFactoryFunction))) {
+ return nullptr;
+ }
+ JS::SetReservedSlot(constructor, legacyFactoryFunctionSlot++,
+ JS::ObjectValue(*legacyFactoryFunction));
+ ++legacyFactoryFunctions;
+ }
+ }
+
+ 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;
+}
+
+void CreateInterfaceObjects(
+ JSContext* cx, JS::Handle<JSObject*> global,
+ JS::Handle<JSObject*> protoProto, const DOMIfaceAndProtoJSClass* protoClass,
+ JS::Heap<JSObject*>* protoCache, JS::Handle<JSObject*> constructorProto,
+ const DOMIfaceJSClass* constructorClass, unsigned ctorNargs,
+ bool isConstructorChromeOnly,
+ 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, bool isNamespace) {
+ MOZ_ASSERT(protoClass || constructorClass, "Need at least one class!");
+ MOZ_ASSERT(
+ !((properties &&
+ (properties->HasMethods() || properties->HasAttributes())) ||
+ (chromeOnlyProperties && (chromeOnlyProperties->HasMethods() ||
+ chromeOnlyProperties->HasAttributes()))) ||
+ protoClass,
+ "Methods or properties but no protoClass!");
+ MOZ_ASSERT(!((properties && (properties->HasStaticMethods() ||
+ properties->HasStaticAttributes())) ||
+ (chromeOnlyProperties &&
+ (chromeOnlyProperties->HasStaticMethods() ||
+ chromeOnlyProperties->HasStaticAttributes()))) ||
+ constructorClass,
+ "Static methods but no constructorClass!");
+ MOZ_ASSERT(!protoClass == !protoCache,
+ "If, and only if, there is an interface prototype object we need "
+ "to cache it");
+ MOZ_ASSERT(bool(constructorClass) == bool(constructorCache),
+ "If, and only if, there is an interface object we need to cache "
+ "it");
+ MOZ_ASSERT(constructorProto || !constructorClass,
+ "Must have a constructor proto if we plan to create a constructor "
+ "object");
+
+ 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 (constructorClass) {
+ interface = CreateInterfaceObject(
+ cx, global, constructorProto, constructorClass,
+ (isChrome || !isConstructorChromeOnly) ? ctorNargs : 0,
+ legacyFactoryFunctions, proto, properties, chromeOnlyProperties,
+ nameStr, isChrome, defineOnGlobal, legacyWindowAliases, isNamespace);
+ 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;
+ }
+}
+
+// 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
+ // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100666
+ 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* GetNativePropertyHooksFromConstructorFunction(
+ JS::Handle<JSObject*> obj) {
+ MOZ_ASSERT(JS_IsNativeFunction(obj, Constructor));
+ const JS::Value& v = js::GetFunctionNativeReserved(
+ obj, CONSTRUCTOR_NATIVE_HOLDER_RESERVED_SLOT);
+ const JSNativeHolder* nativeHolder =
+ static_cast<const JSNativeHolder*>(v.toPrivate());
+ return nativeHolder->mPropertyHooks;
+}
+
+inline const NativePropertyHooks* GetNativePropertyHooks(
+ JSContext* cx, JS::Handle<JSObject*> obj, DOMObjectType& type) {
+ const 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 GetNativePropertyHooksFromConstructorFunction(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)) {
+ const JSClass* objClass = JS::GetClass(obj);
+ if (IsDOMIfaceAndProtoClass(objClass)) {
+ const DOMIfaceJSClass* clazz = DOMIfaceJSClass::FromJSClass(objClass);
+ if (clazz->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;
+ }
+ }
+ }
+ } 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)) {
+ // FIXME https://bugzilla.mozilla.org/show_bug.cgi?id=1071189
+ // Should do something about XBL properties too.
+ if (enumerateOwnProperties &&
+ !enumerateOwnProperties(cx, wrapper, obj, props)) {
+ return false;
+ }
+ }
+
+ return type == eGlobalInterfacePrototype ||
+ XrayOwnNativePropertyKeys(cx, wrapper, nativePropertyHooks, type, obj,
+ flags, props);
+}
+
+const JSClass* XrayGetExpandoClass(JSContext* cx, JS::Handle<JSObject*> obj) {
+ DOMObjectType type;
+ const NativePropertyHooks* nativePropertyHooks =
+ GetNativePropertyHooks(cx, obj, type);
+ if (!IsInstance(type)) {
+ // Non-instances don't need any special expando classes.
+ return &DefaultXrayExpandoObjectClass;
+ }
+
+ return nativePropertyHooks->mXrayExpandoClass;
+}
+
+bool XrayDeleteNamedProperty(JSContext* cx, JS::Handle<JSObject*> wrapper,
+ JS::Handle<JSObject*> obj, JS::Handle<jsid> id,
+ JS::ObjectOpResult& opresult) {
+ DOMObjectType type;
+ const NativePropertyHooks* nativePropertyHooks =
+ GetNativePropertyHooks(cx, obj, type);
+ if (!IsInstance(type) ||
+ !nativePropertyHooks->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};
+
+const JSClassOps sBoringInterfaceObjectClassClassOps = {
+ nullptr, /* addProperty */
+ nullptr, /* delProperty */
+ nullptr, /* enumerate */
+ nullptr, /* newEnumerate */
+ nullptr, /* resolve */
+ nullptr, /* mayResolve */
+ nullptr, /* finalize */
+ ThrowingConstructor, /* call */
+ ThrowingConstructor, /* construct */
+ nullptr, /* trace */
+};
+
+const js::ObjectOps sInterfaceObjectClassObjectOps = {
+ nullptr, /* lookupProperty */
+ nullptr, /* defineProperty */
+ nullptr, /* hasProperty */
+ nullptr, /* getProperty */
+ nullptr, /* setProperty */
+ nullptr, /* getOwnPropertyDescriptor */
+ nullptr, /* deleteProperty */
+ nullptr, /* getElements */
+ InterfaceObjectToString, /* funToString */
+};
+
+bool GetPropertyOnPrototype(JSContext* cx, JS::Handle<JSObject*> proxy,
+ JS::Handle<JS::Value> receiver, JS::Handle<jsid> id,
+ bool* found, JS::MutableHandle<JS::Value> vp) {
+ JS::Rooted<JSObject*> proto(cx);
+ if (!js::GetObjectProto(cx, proxy, &proto)) {
+ return false;
+ }
+ if (!proto) {
+ *found = false;
+ return true;
+ }
+
+ if (!JS_HasPropertyById(cx, proto, id, found)) {
+ return false;
+ }
+
+ if (!*found) {
+ return true;
+ }
+
+ return JS_ForwardGetPropertyTo(cx, proto, id, receiver, vp);
+}
+
+bool HasPropertyOnPrototype(JSContext* cx, JS::Handle<JSObject*> proxy,
+ JS::Handle<jsid> id, bool* has) {
+ JS::Rooted<JSObject*> proto(cx);
+ if (!js::GetObjectProto(cx, proxy, &proto)) {
+ return false;
+ }
+ if (!proto) {
+ *has = false;
+ return true;
+ }
+
+ return JS_HasPropertyById(cx, proto, id, has);
+}
+
+bool AppendNamedPropertyIds(JSContext* cx, JS::Handle<JSObject*> proxy,
+ nsTArray<nsString>& names,
+ bool shadowPrototypeProperties,
+ JS::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) {
+ const JSClass* newTargetClass = JS::GetClass(aNewTarget);
+ if (IsDOMIfaceAndProtoClass(newTargetClass)) {
+ const DOMIfaceAndProtoJSClass* newTargetIfaceClass =
+ DOMIfaceAndProtoJSClass::FromJSClass(newTargetClass);
+ if (newTargetIfaceClass->mType == eInterface) {
+ return newTargetIfaceClass->mPrototypeID;
+ }
+ } else if (JS_IsNativeFunction(aNewTarget, Constructor)) {
+ return GetNativePropertyHooksFromConstructorFunction(aNewTarget)
+ ->mPrototypeID;
+ }
+
+ return prototypes::id::_ID_Count;
+}
+
+bool GetDesiredProto(JSContext* aCx, const JS::CallArgs& aCallArgs,
+ prototypes::id::ID aProtoId,
+ CreateInterfaceObjectsMethod aCreator,
+ JS::MutableHandle<JSObject*> aDesiredProto) {
+ // This basically implements
+ // https://heycam.github.io/webidl/#internally-create-a-new-object-implementing-the-interface
+ // 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, true));
+ 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
+
+// https://html.spec.whatwg.org/multipage/dom.html#htmlconstructor
+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
+ // https://html.spec.whatwg.org/multipage/dom.html#htmlconstructor
+
+ 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, true);
+ 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::GetConstructorObject;
+ } else if (definition->mLocalName == nsGkAtoms::resizer) {
+ cb = XULResizerElement_Binding::GetConstructorObject;
+ } else if (definition->mLocalName == nsGkAtoms::menupopup ||
+ definition->mLocalName == nsGkAtoms::panel ||
+ definition->mLocalName == nsGkAtoms::tooltip) {
+ cb = XULPopupElement_Binding::GetConstructorObject;
+ } else if (definition->mLocalName == nsGkAtoms::iframe ||
+ definition->mLocalName == nsGkAtoms::browser ||
+ definition->mLocalName == nsGkAtoms::editor) {
+ cb = XULFrameElement_Binding::GetConstructorObject;
+ } else if (definition->mLocalName == nsGkAtoms::menu ||
+ definition->mLocalName == nsGkAtoms::menulist) {
+ cb = XULMenuElement_Binding::GetConstructorObject;
+ } else if (definition->mLocalName == nsGkAtoms::tree) {
+ cb = XULTreeElement_Binding::GetConstructorObject;
+ } else {
+ cb = XULElement_Binding::GetConstructorObject;
+ }
+ }
+
+ 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::GetConstructorObject;
+ }
+
+ // 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, nsIURI* aURI,
+ DeprecatedOperations aOperation,
+ const nsAString& 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::GetLocalizedString(nsContentUtils::eDOM_PROPERTIES,
+ key.get(), 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);
+
+ // Walk up to our containing page
+ WorkerPrivate* wp = aWorkerPrivate;
+ while (wp->GetParent()) {
+ wp = wp->GetParent();
+ }
+
+ nsPIDOMWindowInner* window = wp->GetWindow();
+ 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;
+
+ if (NS_IsMainThread()) {
+ nsCOMPtr<nsPIDOMWindowInner> window =
+ do_QueryInterface(aGlobal.GetAsSupports());
+ if (!window || !window->GetExtantDoc()) {
+ return;
+ }
+
+ uri = window->GetExtantDoc()->GetDocumentURI();
+ } else {
+ WorkerPrivate* workerPrivate =
+ GetWorkerPrivateFromContext(aGlobal.Context());
+ if (!workerPrivate) {
+ return;
+ }
+
+ uri = workerPrivate->GetResolvedScriptURI();
+ }
+
+ if (NS_WARN_IF(!uri)) {
+ return;
+ }
+
+ nsAutoString fileName;
+ Nullable<uint32_t> lineNumber;
+ Nullable<uint32_t> columnNumber;
+ uint32_t line = 0;
+ uint32_t column = 1;
+ if (nsJSUtils::GetCallingLocation(aGlobal.Context(), fileName, &line,
+ &column)) {
+ lineNumber.SetValue(line);
+ columnNumber.SetValue(column);
+ }
+
+ nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(aGlobal.GetAsSupports());
+ MOZ_ASSERT(global);
+
+ ReportDeprecation(global, uri, aOperation, 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,
+ bool 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.address());
+}
+
+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);
+}
+
+} // namespace binding_detail
+
+} // namespace dom
+} // namespace mozilla