1 files changed, 90 insertions, 0 deletions
diff --git a/xpcom/base/nsError.h b/xpcom/base/nsError.h
new file mode 100644
index 0000000000..040cd4612c
--- /dev/null
+++ b/xpcom/base/nsError.h
@@ -0,0 +1,90 @@
+/* -*- 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 nsError_h__
+#define nsError_h__
+
+#ifndef __cplusplus
+#  error nsError.h no longer supports C sources
+#endif
+
+#include "mozilla/Attributes.h"
+#include "mozilla/Likely.h"
+
+#include <stdint.h>
+
+#define NS_ERROR_SEVERITY_SUCCESS 0
+#define NS_ERROR_SEVERITY_ERROR 1
+
+#include "ErrorList.h"  // IWYU pragma: export
+
+/**
+ * @name Standard Error Handling Macros
+ * @return 0 or 1 (false/true with bool type for C++)
+ */
+
+inline uint32_t NS_FAILED_impl(nsresult aErr) {
+  return static_cast<uint32_t>(aErr) & 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");
+
+#define MOZ_ALWAYS_SUCCEEDS(expr) MOZ_ALWAYS_TRUE(NS_SUCCEEDED(expr))
+
+/**
+ * @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
+ */
+
+inline constexpr uint16_t NS_ERROR_GET_CODE(nsresult aErr) {
+  return uint32_t(aErr) & 0xffff;
+}
+inline constexpr uint16_t NS_ERROR_GET_MODULE(nsresult aErr) {
+  return ((uint32_t(aErr) >> 16) - NS_ERROR_MODULE_BASE_OFFSET) & 0x1fff;
+}
+inline bool NS_ERROR_GET_SEVERITY(nsresult aErr) {
+  return uint32_t(aErr) >> 31;
+}
+
+#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