tools/llvm-readobj/Error.cpp

   1 //===- Error.cpp - system_error extensions for llvm-readobj -----*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This defines a new error_category for the llvm-readobj tool.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "Error.h"
  15 #include "llvm/Support/ErrorHandling.h"
  16
  17 using namespace llvm;
  18
  19 namespace {
  20 // FIXME: This class is only here to support the transition to llvm::Error. It
  21 // will be removed once this transition is complete. Clients should prefer to
  22 // deal with the Error value directly, rather than converting to error_code.
  23 class _readobj_error_category : public std::error_category {
  24 public:
  25   const char* name() const noexcept override;
  26   std::string message(int ev) const override;
  27 };
  28 } // namespace
  29
  30 const char *_readobj_error_category::name() const noexcept {
  31   return "llvm.readobj";
  32 }
  33
  34 std::string _readobj_error_category::message(int EV) const {
  35   switch (static_cast<readobj_error>(EV)) {
  36   case readobj_error::success: return "Success";
  37   case readobj_error::file_not_found:
  38     return "No such file.";
  39   case readobj_error::unsupported_file_format:
  40     return "The file was not recognized as a valid object file.";
  41   case readobj_error::unrecognized_file_format:
  42     return "Unrecognized file type.";
  43   case readobj_error::unsupported_obj_file_format:
  44     return "Unsupported object file format.";
  45   case readobj_error::unknown_symbol:
  46     return "Unknown symbol.";
  47   }
  48   llvm_unreachable("An enumerator of readobj_error does not have a message "
  49                    "defined.");
  50 }
  51
  52 namespace llvm {
  53 const std::error_category &readobj_category() {
  54   static _readobj_error_category o;
  55   return o;
  56 }
  57 } // namespace llvm