DOMException.h - mozsearch

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_dom_DOMException_h__

#define mozilla_dom_DOMException_h__

// We intentionally shadow non-virtual methods, but gcc gets confused.

#ifdef __GNUC__

#  pragma GCC diagnostic push

#  pragma GCC diagnostic ignored "-Woverloaded-virtual"

#endif

#include <stdint.h>

#include "js/Value.h"

#include "jspubtd.h"

#include "nsCOMPtr.h"

#include "nsCycleCollectionParticipant.h"

#include "nsID.h"

#include "nsWrapperCache.h"

#include "nsIException.h"

#include "nsString.h"

#include "mozilla/dom/BindingDeclarations.h"

class nsIGlobalObject;

class nsIStackFrame;

nsresult NS_GetNameAndMessageForDOMNSResult(nsresult aNSResult,

                                            nsACString& aName,

                                            nsACString& aMessage,

                                            uint16_t* aCode = nullptr);

namespace mozilla {

class ErrorResult;

namespace dom {

class GlobalObject;

#define MOZILLA_EXCEPTION_IID                        \

  {                                                  \

    0x55eda557, 0xeba0, 0x4fe3, {                    \

      0xae, 0x2e, 0xf3, 0x94, 0x49, 0x23, 0x62, 0xd6 \

    }                                                \

class Exception : public nsIException, public nsWrapperCache {

 public:

  NS_DECLARE_STATIC_IID_ACCESSOR(MOZILLA_EXCEPTION_IID)

  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(Exception)

  NS_DECL_CYCLE_COLLECTING_ISUPPORTS

  NS_DECL_NSIEXCEPTION

  const nsCString& GetMessageMoz() const { return mMessage; }

  nsresult GetResult() const { return mResult; }

  // DOMException wants different ToString behavior, so allow it to override.

  virtual void ToString(JSContext* aCx, nsACString& aReturn);

  // Cruft used by XPConnect for exceptions originating in JS implemented

  // components.

  bool StealJSVal(JS::Value* aVp);

  void StowJSVal(JS::Value& aVp);

  // WebIDL API

  virtual JSObject* WrapObject(JSContext* cx,

                               JS::Handle<JSObject*> aGivenProto) override;

  nsISupports* GetParentObject() const { return nullptr; }

  void GetMessageMoz(nsString& retval);

  uint32_t Result() const;

  void GetName(nsAString& retval);

  virtual void GetErrorMessage(nsAString& aRetVal) {

    // Since GetName is non non-virtual and deals with different

    // member variables in Exception vs. DOMException, have a virtual

    // method to ensure the right error message creation.

    nsAutoString name;

    GetName(name);

    CreateErrorMessage(name, aRetVal);

  void GetFilename(JSContext* aCx, nsACString& aFilename);

  uint32_t SourceId(JSContext* aCx) const;

  uint32_t LineNumber(JSContext* aCx) const;

  uint32_t ColumnNumber() const;

  already_AddRefed<nsIStackFrame> GetLocation() const;

  nsISupports* GetData() const;

  void GetStack(JSContext* aCx, nsAString& aStack) const;

  void Stringify(JSContext* aCx, nsString& retval);

  Exception(const nsACString& aMessage, nsresult aResult,

            const nsACString& aName, nsIStackFrame* aLocation,

            nsISupports* aData);

  Exception(nsCString&& aMessage, nsresult aResult, nsCString&& aName);

 protected:

  virtual ~Exception();

  void CreateErrorMessage(const nsAString& aName, nsAString& aRetVal) {

    // Create similar error message as what ErrorReport::init does in jsexn.cpp.

    if (!aName.IsEmpty() && !mMessage.IsEmpty()) {

      aRetVal.Assign(aName);

      aRetVal.AppendLiteral(": ");

      AppendUTF8toUTF16(mMessage, aRetVal);

    } else if (!aName.IsEmpty()) {

      aRetVal.Assign(aName);

    } else if (!mMessage.IsEmpty()) {

      CopyUTF8toUTF16(mMessage, aRetVal);

    } else {

      aRetVal.Truncate();

  nsCString mMessage;

  nsresult mResult;

  nsCString mName;

  nsCOMPtr<nsIStackFrame> mLocation;

  nsCOMPtr<nsISupports> mData;

  bool mHoldingJSVal;

  JS::Heap<JS::Value> mThrownJSVal;

};

NS_DEFINE_STATIC_IID_ACCESSOR(Exception, MOZILLA_EXCEPTION_IID)

class DOMException : public Exception {

 public:

  DOMException(nsresult aRv, const nsACString& aMessage,

               const nsACString& aName, uint16_t aCode,

               nsIStackFrame* aLocation = nullptr);

  DOMException(nsresult aRv, nsCString&& aMessage, nsCString&& aName,

               uint16_t aCode);

  NS_INLINE_DECL_REFCOUNTING_INHERITED(DOMException, Exception)

  // nsWrapperCache overrides

  virtual JSObject* WrapObject(JSContext* aCx,

                               JS::Handle<JSObject*> aGivenProto) override;

  static already_AddRefed<DOMException> Constructor(

      GlobalObject& /* unused */, const nsAString& aMessage,

      const Optional<nsAString>& aName);

  uint16_t Code() const { return mCode; }

  // Intentionally shadow the Exception version.

  void GetName(nsString& retval);

  // Exception overrides

  void ToString(JSContext* aCx, nsACString& aReturn) override;

  virtual void GetErrorMessage(nsAString& aRetVal) override {

    // See the comment in Exception::GetErrorMessage.

    nsAutoString name;

    GetName(name);

    CreateErrorMessage(name, aRetVal);

  static already_AddRefed<DOMException> Create(nsresult aRv);

  static already_AddRefed<DOMException> Create(nsresult aRv,

                                               const nsACString& aMessage);

  static already_AddRefed<DOMException> ReadStructuredClone(

      JSContext* aCx, nsIGlobalObject* aGlobal,

      JSStructuredCloneReader* aReader);

  bool WriteStructuredClone(JSContext* aCx,

                            JSStructuredCloneWriter* aWriter) const;

 protected:

  virtual ~DOMException() = default;

  uint16_t mCode;

};

}  // namespace dom

}  // namespace mozilla

#ifdef __GNUC__

#  pragma GCC diagnostic pop

#endif

#endif