1 //===- llvm/Support/Errc.h - Defines the llvm::errc enum --------*- 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 // While std::error_code works OK on all platforms we use, there are some
11 // some problems with std::errc that can be avoided by using our own
12 // enumeration:
13 //
14 // * std::errc is a namespace in some implementations. That meas that ADL
15 //   doesn't work and it is sometimes necessary to write std::make_error_code
16 //   or in templates:
17 //   using std::make_error_code;
18 //   make_error_code(...);
19 //
20 //   with this enum it is safe to always just use make_error_code.
21 //
22 // * Some implementations define fewer names than others. This header has
23 //   the intersection of all the ones we support.
24 //
25 // * std::errc is just marked with is_error_condition_enum. This means that
26 //   common patters like AnErrorCode == errc::no_such_file_or_directory take
27 //   4 virtual calls instead of two comparisons.
28 //===----------------------------------------------------------------------===//
29 
30 #ifndef LLVM_SUPPORT_ERRC_H
31 #define LLVM_SUPPORT_ERRC_H
32 
33 #include <system_error>
34 
35 namespace llvm {
36 enum class errc {
37   argument_list_too_long = int(std::errc::argument_list_too_long),
38   argument_out_of_domain = int(std::errc::argument_out_of_domain),
39   bad_address = int(std::errc::bad_address),
40   bad_file_descriptor = int(std::errc::bad_file_descriptor),
41   broken_pipe = int(std::errc::broken_pipe),
42   device_or_resource_busy = int(std::errc::device_or_resource_busy),
43   directory_not_empty = int(std::errc::directory_not_empty),
44   executable_format_error = int(std::errc::executable_format_error),
45   file_exists = int(std::errc::file_exists),
46   file_too_large = int(std::errc::file_too_large),
47   filename_too_long = int(std::errc::filename_too_long),
48   function_not_supported = int(std::errc::function_not_supported),
49   illegal_byte_sequence = int(std::errc::illegal_byte_sequence),
50   inappropriate_io_control_operation =
51       int(std::errc::inappropriate_io_control_operation),
52   interrupted = int(std::errc::interrupted),
53   invalid_argument = int(std::errc::invalid_argument),
54   invalid_seek = int(std::errc::invalid_seek),
55   io_error = int(std::errc::io_error),
56   is_a_directory = int(std::errc::is_a_directory),
57   no_child_process = int(std::errc::no_child_process),
58   no_lock_available = int(std::errc::no_lock_available),
59   no_space_on_device = int(std::errc::no_space_on_device),
60   no_such_device_or_address = int(std::errc::no_such_device_or_address),
61   no_such_device = int(std::errc::no_such_device),
62   no_such_file_or_directory = int(std::errc::no_such_file_or_directory),
63   no_such_process = int(std::errc::no_such_process),
64   not_a_directory = int(std::errc::not_a_directory),
65   not_enough_memory = int(std::errc::not_enough_memory),
66   operation_not_permitted = int(std::errc::operation_not_permitted),
67   permission_denied = int(std::errc::permission_denied),
68   read_only_file_system = int(std::errc::read_only_file_system),
69   resource_deadlock_would_occur = int(std::errc::resource_deadlock_would_occur),
70   resource_unavailable_try_again =
71       int(std::errc::resource_unavailable_try_again),
72   result_out_of_range = int(std::errc::result_out_of_range),
73   too_many_files_open_in_system = int(std::errc::too_many_files_open_in_system),
74   too_many_files_open = int(std::errc::too_many_files_open),
75   too_many_links = int(std::errc::too_many_links)
76 };
77 
make_error_code(errc E)78 inline std::error_code make_error_code(errc E) {
79   return std::error_code(static_cast<int>(E), std::generic_category());
80 }
81 }
82 
83 namespace std {
84 template <> struct is_error_code_enum<llvm::errc> : std::true_type {};
85 }
86 #endif
87