text: //===- Error.cpp - system_error extensions for llvm-readobj -----*- 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 llvm-readobj tool.
  //
  //===----------------------------------------------------------------------===//
  
  #include "Error.h"
  #include "llvm/Support/ErrorHandling.h"
  
  using namespace llvm;
  
  namespace {
  class _readobj_error_category : public error_category {
  public:
    const char* name() const override;
    std::string message(int ev) const override;
    error_condition default_error_condition(int ev) const override;
  };
  } // namespace
  
  const char *_readobj_error_category::name() const {
    return "llvm.readobj";
  }
  
  std::string _readobj_error_category::message(int ev) const {
    switch (ev) {
    case readobj_error::success: return "Success";
    case readobj_error::file_not_found:
      return "No such file.";
    case readobj_error::unsupported_file_format:
      return "The file was not recognized as a valid object file.";
    case readobj_error::unrecognized_file_format:
      return "Unrecognized file type.";
    case readobj_error::unsupported_obj_file_format:
      return "Unsupported object file format.";
    case readobj_error::unknown_symbol:
      return "Unknown symbol.";
    default:
      llvm_unreachable("An enumerator of readobj_error does not have a message "
                       "defined.");
    }
  }
  
  error_condition _readobj_error_category::default_error_condition(int ev) const {
    if (ev == readobj_error::success)
      return errc::success;
    return errc::invalid_argument;
  }
  
  namespace llvm {
  const error_category &readobj_category() {
    static _readobj_error_category o;
    return o;
  }
  } // namespace llvm
  