Add Object/Error.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132909 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Object/Error.h

@@ -0,0 +1,49 @@
+//===- Error.h - system_error extensions for Object -------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This declares a new error_category for the Object library.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_OBJECT_ERROR_H
+#define LLVM_OBJECT_ERROR_H
+
+#include "llvm/Support/system_error.h"
+
+namespace llvm {
+namespace object {
+
+const error_category &object_category();
+
+struct object_error {
+enum _ {
+  success = 0,
+  invalid_file_type,
+  parse_failed
+};
+  _ v_;
+
+  object_error(_ v) : v_(v) {}
+  explicit object_error(int v) : v_(_(v)) {}
+  operator int() const {return v_;}
+};
+
+} // end namespace object.
+
+template <> struct is_error_code_enum<object::object_error> : true_type { };
+
+template <> struct is_error_code_enum<object::object_error::_> : true_type { };
+
+inline error_code make_error_code(object::object_error e) {
+  return error_code(static_cast<int>(e), object::object_category());
+}
+
+} // end namespace llvm.
+
+#endif

lib/Object/CMakeLists.txt

@@ -1,6 +1,7 @@
 add_llvm_library(LLVMObject
   COFFObjectFile.cpp
   ELFObjectFile.cpp
+  Error.cpp
   MachOObject.cpp
   MachOObjectFile.cpp
   Object.cpp

lib/Object/Error.cpp

@@ -0,0 +1,55 @@
+//===- Error.cpp - system_error extensions for Object -----------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This defines a new error_category for the Object library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Object/Error.h"
+#include "llvm/Support/ErrorHandling.h"
+
+using namespace llvm;
+using namespace object;
+
+namespace {
+class _object_error_category : public _do_message {
+public:
+  virtual const char* name() const;
+  virtual std::string message(int ev) const;
+  virtual error_condition default_error_condition(int ev) const;
+};
+}
+
+const char *_object_error_category::name() const {
+  return "llvm.object";
+}
+
+std::string _object_error_category::message(int ev) const {
+  switch (ev) {
+  case object_error::success: return "Success";
+  case object_error::invalid_file_type:
+    return "The file was not recognized as a valid object file";
+  case object_error::parse_failed:
+    return "Invalid data was encountered while parsing the file";
+  default:
+    llvm_unreachable("An enumerator of object_error does not have a message "
+                     "defined.");
+  }
+}
+
+error_condition _object_error_category::default_error_condition(int ev) const {
+  if (ev == object_error::success)
+    return errc::success;
+  return errc::invalid_argument;
+}
+
+const error_category &object::object_category() {
+  static _object_error_category o;
+  return o;
+}