1 files changed, 104 insertions, 0 deletions
diff --git a/dom/ipc/ClonedErrorHolder.h b/dom/ipc/ClonedErrorHolder.h
new file mode 100644
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+++ b/dom/ipc/ClonedErrorHolder.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* 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/. */
+
+#ifndef mozilla_dom_ClonedErrorHolder_h
+#define mozilla_dom_ClonedErrorHolder_h
+
+#include "nsISupportsImpl.h"
+#include "js/ErrorReport.h"
+#include "js/TypeDecls.h"
+#include "mozilla/dom/BindingDeclarations.h"
+#include "mozilla/dom/StructuredCloneHolder.h"
+#include "mozilla/Attributes.h"
+
+class nsIGlobalObject;
+class nsQueryActorChild;
+
+namespace mozilla {
+class ErrorResult;
+
+namespace dom {
+
+class ClonedErrorHolder final {
+  NS_INLINE_DECL_REFCOUNTING(ClonedErrorHolder)
+
+ public:
+  static already_AddRefed<ClonedErrorHolder> Constructor(
+      const GlobalObject& aGlobal, JS::Handle<JSObject*> aError,
+      ErrorResult& aRv);
+
+  static already_AddRefed<ClonedErrorHolder> Create(
+      JSContext* aCx, JS::Handle<JSObject*> aError, ErrorResult& aRv);
+
+  enum class Type : uint8_t {
+    Uninitialized,
+    JSError,
+    Exception,
+    DOMException,
+    Max_,
+  };
+
+  bool WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto,
+                  JS::MutableHandle<JSObject*> aReflector);
+
+  bool WriteStructuredClone(JSContext* aCx, JSStructuredCloneWriter* aWriter,
+                            StructuredCloneHolder* aHolder);
+
+  // Reads the structured clone data for the ClonedErrorHolder and returns the
+  // wrapped object (either a JS Error or an Exception/DOMException object)
+  // directly. Never returns an actual ClonedErrorHolder object.
+  static JSObject* ReadStructuredClone(JSContext* aCx,
+                                       JSStructuredCloneReader* aReader,
+                                       StructuredCloneHolder* aHolder);
+
+ private:
+  ClonedErrorHolder();
+  ~ClonedErrorHolder() = default;
+
+  void Init(JSContext* aCx, JS::Handle<JSObject*> aError, ErrorResult& aRv);
+
+  bool Init(JSContext* aCx, JSStructuredCloneReader* aReader);
+
+  // Creates a new JS Error or Exception/DOMException object based on the
+  // values stored in the holder. Returns false and sets an exception on aCx
+  // if it fails.
+  bool ToErrorValue(JSContext* aCx, JS::MutableHandle<JS::Value> aResult);
+
+  class Holder final : public StructuredCloneHolder {
+   public:
+    using StructuredCloneHolder::StructuredCloneHolder;
+
+    bool ReadStructuredCloneInternal(JSContext* aCx,
+                                     JSStructuredCloneReader* aReader);
+  };
+
+  // Only a subset of the following fields are used, depending on the mType of
+  // the error stored:
+  nsCString mName;        // Exception, DOMException
+  nsCString mMessage;     // JSError, Exception, DOMException
+  nsCString mFilename;    // JSError only
+  nsCString mSourceLine;  // JSError only
+
+  uint32_t mLineNumber = 0;   // JSError only
+  uint32_t mColumn = 0;       // JSError only
+  uint32_t mTokenOffset = 0;  // JSError only
+  uint32_t mErrorNumber = 0;  // JSError only
+
+  Type mType = Type::Uninitialized;
+
+  uint16_t mCode = 0;                 // DOMException only
+  JSExnType mExnType = JSExnType(0);  // JSError only
+  nsresult mResult = NS_OK;           // Exception, DOMException
+
+  // JSError, Exception, DOMException
+  Holder mStack{Holder::CloningSupported, Holder::TransferringNotSupported,
+                Holder::StructuredCloneScope::DifferentProcess};
+};
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // !defined(mozilla_dom_ClonedErrorHolder_h)