1 //===- Error.cpp - system_error extensions for llvm-readobj -----*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This defines a new error_category for the llvm-readobj tool.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #include "Error.h"
14 #include "llvm/Support/ErrorHandling.h"
15 
16 using namespace llvm;
17 
18 namespace {
19 // FIXME: This class is only here to support the transition to llvm::Error. It
20 // will be removed once this transition is complete. Clients should prefer to
21 // deal with the Error value directly, rather than converting to error_code.
22 class _readobj_error_category : public std::error_category {
23 public:
24   const char* name() const noexcept override;
25   std::string message(int ev) const override;
26 };
27 } // namespace
28 
name() const29 const char *_readobj_error_category::name() const noexcept {
30   return "llvm.readobj";
31 }
32 
message(int EV) const33 std::string _readobj_error_category::message(int EV) const {
34   switch (static_cast<readobj_error>(EV)) {
35   case readobj_error::success: return "Success";
36   case readobj_error::file_not_found:
37     return "No such file.";
38   case readobj_error::unsupported_file_format:
39     return "The file was not recognized as a valid object file.";
40   case readobj_error::unrecognized_file_format:
41     return "Unrecognized file type.";
42   case readobj_error::unsupported_obj_file_format:
43     return "Unsupported object file format.";
44   case readobj_error::unknown_symbol:
45     return "Unknown symbol.";
46   }
47   llvm_unreachable("An enumerator of readobj_error does not have a message "
48                    "defined.");
49 }
50 
51 namespace llvm {
readobj_category()52 const std::error_category &readobj_category() {
53   static _readobj_error_category o;
54   return o;
55 }
56 } // namespace llvm
57