diff -r 000000000000 -r 6474c204b198 xpcom/base/nsError.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/xpcom/base/nsError.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,250 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsError_h__
+#define nsError_h__
+
+#include "mozilla/Likely.h"
+#include "mozilla/TypedEnum.h"
+
+#include <stdint.h>
+
+/*
+ * To add error code to your module, you need to do the following:
+ *
+ * 1) Add a module offset code.  Add yours to the bottom of the list
+ *    right below this comment, adding 1.
+ *
+ * 2) In your module, define a header file which uses one of the
+ *    NE_ERROR_GENERATExxxxxx macros.  Some examples below:
+ *
+ *    #define NS_ERROR_MYMODULE_MYERROR1 NS_ERROR_GENERATE(NS_ERROR_SEVERITY_ERROR,NS_ERROR_MODULE_MYMODULE,1)
+ *    #define NS_ERROR_MYMODULE_MYERROR2 NS_ERROR_GENERATE_SUCCESS(NS_ERROR_MODULE_MYMODULE,2)
+ *    #define NS_ERROR_MYMODULE_MYERROR3 NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_MYMODULE,3)
+ *
+ */
+
+
+/**
+ * @name Standard Module Offset Code. Each Module should identify a unique number
+ *       and then all errors associated with that module become offsets from the
+ *       base associated with that module id. There are 16 bits of code bits for
+ *       each module.
+ */
+
+#define NS_ERROR_MODULE_XPCOM      1
+#define NS_ERROR_MODULE_BASE       2
+#define NS_ERROR_MODULE_GFX        3
+#define NS_ERROR_MODULE_WIDGET     4
+#define NS_ERROR_MODULE_CALENDAR   5
+#define NS_ERROR_MODULE_NETWORK    6
+#define NS_ERROR_MODULE_PLUGINS    7
+#define NS_ERROR_MODULE_LAYOUT     8
+#define NS_ERROR_MODULE_HTMLPARSER 9
+#define NS_ERROR_MODULE_RDF        10
+#define NS_ERROR_MODULE_UCONV      11
+#define NS_ERROR_MODULE_REG        12
+#define NS_ERROR_MODULE_FILES      13
+#define NS_ERROR_MODULE_DOM        14
+#define NS_ERROR_MODULE_IMGLIB     15
+#define NS_ERROR_MODULE_MAILNEWS   16
+#define NS_ERROR_MODULE_EDITOR     17
+#define NS_ERROR_MODULE_XPCONNECT  18
+#define NS_ERROR_MODULE_PROFILE    19
+#define NS_ERROR_MODULE_LDAP       20
+#define NS_ERROR_MODULE_SECURITY   21
+#define NS_ERROR_MODULE_DOM_XPATH  22
+/* 23 used to be NS_ERROR_MODULE_DOM_RANGE (see bug 711047) */
+#define NS_ERROR_MODULE_URILOADER  24
+#define NS_ERROR_MODULE_CONTENT    25
+#define NS_ERROR_MODULE_PYXPCOM    26
+#define NS_ERROR_MODULE_XSLT       27
+#define NS_ERROR_MODULE_IPC        28
+#define NS_ERROR_MODULE_SVG        29
+#define NS_ERROR_MODULE_STORAGE    30
+#define NS_ERROR_MODULE_SCHEMA     31
+#define NS_ERROR_MODULE_DOM_FILE   32
+#define NS_ERROR_MODULE_DOM_INDEXEDDB 33
+#define NS_ERROR_MODULE_DOM_FILEHANDLE 34
+#define NS_ERROR_MODULE_SIGNED_JAR 35
+#define NS_ERROR_MODULE_DOM_FILESYSTEM 36
+
+/* NS_ERROR_MODULE_GENERAL should be used by modules that do not
+ * care if return code values overlap. Callers of methods that
+ * return such codes should be aware that they are not
+ * globally unique. Implementors should be careful about blindly
+ * returning codes from other modules that might also use
+ * the generic base.
+ */
+#define NS_ERROR_MODULE_GENERAL    51
+
+/**
+ * @name Severity Code.  This flag identifies the level of warning
+ */
+
+#define NS_ERROR_SEVERITY_SUCCESS       0
+#define NS_ERROR_SEVERITY_ERROR         1
+
+/**
+ * @name Mozilla Code.  This flag separates consumers of mozilla code
+ *       from the native platform
+ */
+
+#define NS_ERROR_MODULE_BASE_OFFSET 0x45
+
+/* Helpers for defining our enum, to be undef'd later */
+#define SUCCESS_OR_FAILURE(sev, module, code) \
+  ((uint32_t)(sev) << 31) | \
+  ((uint32_t)(module + NS_ERROR_MODULE_BASE_OFFSET) << 16) | \
+  (uint32_t)(code)
+#define SUCCESS(code) \
+  SUCCESS_OR_FAILURE(NS_ERROR_SEVERITY_SUCCESS, MODULE, code)
+#define FAILURE(code) \
+  SUCCESS_OR_FAILURE(NS_ERROR_SEVERITY_ERROR, MODULE, code)
+
+/**
+ * @name Standard return values
+ */
+
+/*@{*/
+
+/* Unfortunately, our workaround for compilers that don't support enum class
+ * doesn't really work for nsresult.  We need constants like NS_OK with type
+ * nsresult, but they can't be used in (e.g.) switch cases if they're objects.
+ * But if we define them to be of type nsresult::Enum instead, that causes
+ *   return foo ? F() : NS_ERROR_FAILURE;
+ * to fail, because nsresult and nsresult::Enum are two distinct types and
+ * either can be converted to the other, so it's ambiguous.  So we have to fall
+ * back to a regular enum.
+ */
+#if defined(MOZ_HAVE_CXX11_STRONG_ENUMS)
+  typedef enum class tag_nsresult : uint32_t
+  {
+    #undef ERROR
+    #define ERROR(key, val) key = val
+    #include "ErrorList.h"
+    #undef ERROR
+  } nsresult;
+
+  /*
+   * enum classes don't place their initializers in the global scope, so we need
+   * #define's for compatibility with old code.
+   */
+  #include "ErrorListCxxDefines.h"
+#elif defined(MOZ_HAVE_CXX11_ENUM_TYPE)
+  typedef enum tag_nsresult : uint32_t
+  {
+    #undef ERROR
+    #define ERROR(key, val) key = val
+    #include "ErrorList.h"
+    #undef ERROR
+  } nsresult;
+#elif defined(__cplusplus)
+  /*
+   * We're C++ in an old compiler lacking enum classes *and* typed enums (likely
+   * gcc < 4.5.1 as clang/MSVC have long supported one or both), or compiler
+   * support is unknown.  Yet nsresult must have unsigned 32-bit representation.
+   * So just make it a typedef, and implement the constants with global consts.
+   */
+  typedef uint32_t nsresult;
+
+  const nsresult
+  #undef ERROR
+  #define ERROR(key, val) key = val
+  #include "ErrorList.h"
+  #undef ERROR
+    ;
+#else
+  /*
+   * C doesn't have any way to fix the type underlying an enum, and enum
+   * initializers can't have values outside the range of 'int'.  So typedef
+   * nsresult to the correct unsigned type, and fall back to using #defines for
+   * all error constants.
+   */
+  typedef uint32_t nsresult;
+  #include "ErrorListCDefines.h"
+#endif
+
+#undef SUCCESS_OR_FAILURE
+#undef SUCCESS
+#undef FAILURE
+
+/**
+ * @name Standard Error Handling Macros
+ * @return 0 or 1 (false/true with bool type for C++)
+ */
+
+#ifdef __cplusplus
+inline uint32_t NS_FAILED_impl(nsresult _nsresult) {
+  return static_cast<uint32_t>(_nsresult) & 0x80000000;
+}
+#define NS_FAILED(_nsresult)    ((bool)MOZ_UNLIKELY(NS_FAILED_impl(_nsresult)))
+#define NS_SUCCEEDED(_nsresult) ((bool)MOZ_LIKELY(!NS_FAILED_impl(_nsresult)))
+
+/* Check that our enum type is actually uint32_t as expected */
+static_assert(((nsresult)0) < ((nsresult)-1),
+              "nsresult must be an unsigned type");
+static_assert(sizeof(nsresult) == sizeof(uint32_t),
+              "nsresult must be 32 bits");
+#else
+#define NS_FAILED_impl(_nsresult) ((_nsresult) & 0x80000000)
+#define NS_FAILED(_nsresult)    (MOZ_UNLIKELY(NS_FAILED_impl(_nsresult)))
+#define NS_SUCCEEDED(_nsresult) (MOZ_LIKELY(!NS_FAILED_impl(_nsresult)))
+#endif
+
+/**
+ * @name Standard Error Generating Macros
+ */
+
+#define NS_ERROR_GENERATE(sev, module, code) \
+    (nsresult)(((uint32_t)(sev) << 31) | \
+               ((uint32_t)(module + NS_ERROR_MODULE_BASE_OFFSET) << 16) | \
+               ((uint32_t)(code)))
+
+#define NS_ERROR_GENERATE_SUCCESS(module, code) \
+  NS_ERROR_GENERATE(NS_ERROR_SEVERITY_SUCCESS, module, code)
+
+#define NS_ERROR_GENERATE_FAILURE(module, code) \
+  NS_ERROR_GENERATE(NS_ERROR_SEVERITY_ERROR, module, code)
+
+ /*
+  * This will return the nsresult corresponding to the most recent NSPR failure
+  * returned by PR_GetError.
+  *
+  ***********************************************************************
+  *      Do not depend on this function. It will be going away!
+  ***********************************************************************
+  */
+extern nsresult
+NS_ErrorAccordingToNSPR();
+
+
+/**
+ * @name Standard Macros for retrieving error bits
+ */
+
+#ifdef __cplusplus
+inline uint16_t NS_ERROR_GET_CODE(nsresult err) {
+  return uint32_t(err) & 0xffff;
+}
+inline uint16_t NS_ERROR_GET_MODULE(nsresult err) {
+  return ((uint32_t(err) >> 16) - NS_ERROR_MODULE_BASE_OFFSET) & 0x1fff;
+}
+inline bool NS_ERROR_GET_SEVERITY(nsresult err) {
+  return uint32_t(err) >> 31;
+}
+#else
+#define NS_ERROR_GET_CODE(err)     ((err) & 0xffff)
+#define NS_ERROR_GET_MODULE(err)   ((((err) >> 16) - NS_ERROR_MODULE_BASE_OFFSET) & 0x1fff)
+#define NS_ERROR_GET_SEVERITY(err) (((err) >> 31) & 0x1)
+#endif
+
+
+#ifdef _MSC_VER
+#pragma warning(disable: 4251) /* 'nsCOMPtr<class nsIInputStream>' needs to have dll-interface to be used by clients of class 'nsInputStream' */
+#pragma warning(disable: 4275) /* non dll-interface class 'nsISupports' used as base for dll-interface class 'nsIRDFNode' */
+#endif
+
+#endif