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