1 files changed, 77 insertions, 0 deletions
diff --git a/js/xpconnect/src/XPCException.cpp b/js/xpconnect/src/XPCException.cpp
new file mode 100644
index 0000000000..64a83e3b31
--- /dev/null
+++ b/js/xpconnect/src/XPCException.cpp
@@ -0,0 +1,77 @@
+/* -*- 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/. */
+
+/* An implementaion of nsIException. */
+
+#include "xpcprivate.h"
+#include "nsError.h"
+
+#include <iterator>
+
+/***************************************************************************/
+/* Quick and dirty mapping of well known result codes to strings. We only
+ *  call this when building an exception object, so iterating the short array
+ *  is not too bad.
+ *
+ *  It sure would be nice to have exceptions declared in idl and available
+ *  in some more global way at runtime.
+ */
+
+static const struct ResultMap {
+  nsresult rv;
+  const char* name;
+  const char* format;
+} map[] = {
+#define XPC_MSG_DEF(val, format) {(val), #val, format},
+#include "xpc.msg"
+#undef XPC_MSG_DEF
+    {NS_OK, 0, 0}  // sentinel to mark end of array
+};
+
+#define RESULT_COUNT (std::size(map) - 1)
+
+// static
+bool nsXPCException::NameAndFormatForNSResult(nsresult rv, const char** name,
+                                              const char** format) {
+  for (const ResultMap* p = map; p->name; p++) {
+    if (rv == p->rv) {
+      if (name) *name = p->name;
+      if (format) *format = p->format;
+      return true;
+    }
+  }
+  return false;
+}
+
+// static
+const void* nsXPCException::IterateNSResults(nsresult* rv, const char** name,
+                                             const char** format,
+                                             const void** iterp) {
+  const ResultMap* p = (const ResultMap*)*iterp;
+  if (!p) {
+    p = map;
+  } else {
+    p++;
+  }
+  if (!p->name) {
+    p = nullptr;
+  } else {
+    if (rv) {
+      *rv = p->rv;
+    }
+    if (name) {
+      *name = p->name;
+    }
+    if (format) {
+      *format = p->format;
+    }
+  }
+  *iterp = p;
+  return p;
+}
+
+// static
+uint32_t nsXPCException::GetNSResultCount() { return RESULT_COUNT; }