Error.cpp revision 309124 
1//===- Error.cpp - system_error extensions for Object -----------*- 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 Object library.
11//
12//===----------------------------------------------------------------------===//
13
14#include "llvm/Object/Error.h"
15#include "llvm/Support/ErrorHandling.h"
16#include "llvm/Support/ManagedStatic.h"
17
18using namespace llvm;
19using namespace object;
20
21namespace {
22// FIXME: This class is only here to support the transition to llvm::Error. It
23// will be removed once this transition is complete. Clients should prefer to
24// deal with the Error value directly, rather than converting to error_code.
25class _object_error_category : public std::error_category {
26public:
27  const char* name() const LLVM_NOEXCEPT override;
28  std::string message(int ev) const override;
29};
30}
31
32const char *_object_error_category::name() const LLVM_NOEXCEPT {
33  return "llvm.object";
34}
35
36std::string _object_error_category::message(int EV) const {
37  object_error E = static_cast<object_error>(EV);
38  switch (E) {
39  case object_error::arch_not_found:
40    return "No object file for requested architecture";
41  case object_error::invalid_file_type:
42    return "The file was not recognized as a valid object file";
43  case object_error::parse_failed:
44    return "Invalid data was encountered while parsing the file";
45  case object_error::unexpected_eof:
46    return "The end of the file was unexpectedly encountered";
47  case object_error::string_table_non_null_end:
48    return "String table must end with a null terminator";
49  case object_error::invalid_section_index:
50    return "Invalid section index";
51  case object_error::bitcode_section_not_found:
52    return "Bitcode section not found in object file";
53  }
54  llvm_unreachable("An enumerator of object_error does not have a message "
55                   "defined.");
56}
57
58char BinaryError::ID = 0;
59char GenericBinaryError::ID = 0;
60
61GenericBinaryError::GenericBinaryError(Twine Msg) : Msg(Msg.str()) {}
62
63GenericBinaryError::GenericBinaryError(Twine Msg, object_error ECOverride)
64    : Msg(Msg.str()) {
65  setErrorCode(make_error_code(ECOverride));
66}
67
68void GenericBinaryError::log(raw_ostream &OS) const {
69  OS << Msg;
70}
71
72static ManagedStatic<_object_error_category> error_category;
73
74const std::error_category &object::object_category() {
75  return *error_category;
76}
77
78llvm::Error llvm::object::isNotObjectErrorInvalidFileType(llvm::Error Err) {
79  if (auto Err2 =
80       handleErrors(std::move(Err),
81         [](std::unique_ptr<ECError> M) {
82           // Try to handle 'M'. If successful, return a success value from
83           // the handler.
84           if (M->convertToErrorCode() == object_error::invalid_file_type)
85             return Error::success();
86
87           // We failed to handle 'M' - return it from the handler.
88           // This value will be passed back from catchErrors and
89           // wind up in Err2, where it will be returned from this function.
90           return Error(std::move(M));
91         }))
92    return Err2;
93  return Err;
94}
95