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 // 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.
25 class _object_error_category : public std::error_category {
26 public:
27   const char* name() const noexcept override;
28   std::string message(int ev) const override;
29 };
30 }
31 
32 const char *_object_error_category::name() const noexcept {
33   return "llvm.object";
34 }
35 
36 std::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   case object_error::invalid_symbol_index:
54     return "Invalid symbol index";
55   }
56   llvm_unreachable("An enumerator of object_error does not have a message "
57                    "defined.");
58 }
59 
60 char BinaryError::ID = 0;
61 char GenericBinaryError::ID = 0;
62 
63 GenericBinaryError::GenericBinaryError(Twine Msg) : Msg(Msg.str()) {}
64 
65 GenericBinaryError::GenericBinaryError(Twine Msg, object_error ECOverride)
66     : Msg(Msg.str()) {
67   setErrorCode(make_error_code(ECOverride));
68 }
69 
70 void GenericBinaryError::log(raw_ostream &OS) const {
71   OS << Msg;
72 }
73 
74 static ManagedStatic<_object_error_category> error_category;
75 
76 const std::error_category &object::object_category() {
77   return *error_category;
78 }
79 
80 llvm::Error llvm::object::isNotObjectErrorInvalidFileType(llvm::Error Err) {
81   if (auto Err2 =
82           handleErrors(std::move(Err), [](std::unique_ptr<ECError> M) -> Error {
83             // Try to handle 'M'. If successful, return a success value from
84             // the handler.
85             if (M->convertToErrorCode() == object_error::invalid_file_type)
86               return Error::success();
87 
88             // We failed to handle 'M' - return it from the handler.
89             // This value will be passed back from catchErrors and
90             // wind up in Err2, where it will be returned from this function.
91             return Error(std::move(M));
92           }))
93     return Err2;
94   return Err;
95 }
96