gcc/c-family/known-headers.cc

   1 /* Support for suggestions about missing #include directives.
   2    Copyright (C) 2017 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 3, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 #include "config.h"
  21 #define INCLUDE_UNIQUE_PTR
  22 #include "system.h"
  23 #include "coretypes.h"
  24 #include "c-family/c-common.h"
  25 #include "c-family/name-hint.h"
  26 #include "c-family/known-headers.h"
  27 #include "gcc-rich-location.h"
  28
  29 /* An enum for distinguishing between the C and C++ stdlibs.  */
  30
  31 enum stdlib
  32 {
  33   STDLIB_C,
  34   STDLIB_CPLUSPLUS,
  35
  36   NUM_STDLIBS
  37 };
  38
  39 /* A struct for associating names in a standard library with the header
  40    that should be included to locate them, for each of the C and C++ stdlibs
  41    (or NULL, for names that aren't in a header for a particular stdlib).  */
  42
  43 struct stdlib_hint
  44 {
  45   const char *name;
  46   const char *header[NUM_STDLIBS];
  47 };
  48
  49 /* Given non-NULL NAME, return the header name defining it within either
  50    the standard library (with '<' and '>'), or NULL.
  51    Only handles a subset of the most common names within the stdlibs.  */
  52
  53 static const char *
  54 get_stdlib_header_for_name (const char *name, enum stdlib lib)
  55 {
  56   gcc_assert (name);
  57   gcc_assert (lib < NUM_STDLIBS);
  58
  59   static const stdlib_hint hints[] = {
  60     /* <errno.h> and <cerrno>.  */
  61     {"errno", {"<errno.h>", "<cerrno>"} },
  62
  63     /* <limits.h> and <climits>.  */
  64     {"CHAR_BIT", {"<limits.h>", "<climits>"} },
  65     {"CHAR_MAX", {"<limits.h>", "<climits>"} },
  66     {"CHAR_MIN", {"<limits.h>", "<climits>"} },
  67     {"INT_MAX", {"<limits.h>", "<climits>"} },
  68     {"INT_MIN", {"<limits.h>", "<climits>"} },
  69     {"LLONG_MAX", {"<limits.h>", "<climits>"} },
  70     {"LLONG_MIN", {"<limits.h>", "<climits>"} },
  71     {"LONG_MAX", {"<limits.h>", "<climits>"} },
  72     {"LONG_MIN", {"<limits.h>", "<climits>"} },
  73     {"MB_LEN_MAX", {"<limits.h>", "<climits>"} },
  74     {"SCHAR_MAX", {"<limits.h>", "<climits>"} },
  75     {"SCHAR_MIN", {"<limits.h>", "<climits>"} },
  76     {"SHRT_MAX", {"<limits.h>", "<climits>"} },
  77     {"SHRT_MIN", {"<limits.h>", "<climits>"} },
  78     {"UCHAR_MAX", {"<limits.h>", "<climits>"} },
  79     {"UINT_MAX", {"<limits.h>", "<climits>"} },
  80     {"ULLONG_MAX", {"<limits.h>", "<climits>"} },
  81     {"ULONG_MAX", {"<limits.h>", "<climits>"} },
  82     {"USHRT_MAX", {"<limits.h>", "<climits>"} },
  83
  84     /* <stdarg.h> and <cstdarg>.  */
  85     {"va_list", {"<stdarg.h>", "<cstdarg>"} },
  86
  87     /* <stddef.h> and <cstddef>.  */
  88     {"NULL", {"<stddef.h>", "<cstddef>"} },
  89     {"nullptr_t", {NULL, "<cstddef>"} },
  90     {"offsetof", {"<stddef.h>", "<cstddef>"} },
  91     {"ptrdiff_t", {"<stddef.h>", "<cstddef>"} },
  92     {"size_t", {"<stddef.h>", "<cstddef>"} },
  93     {"wchar_t", {"<stddef.h>", NULL /* a keyword in C++ */} },
  94
  95     /* <stdio.h>.  */
  96     {"BUFSIZ", {"<stdio.h>", "<cstdio>"} },
  97     {"EOF", {"<stdio.h>", "<cstdio>"} },
  98     {"FILE", {"<stdio.h>", "<cstdio>"} },
  99     {"FILENAME_MAX", {"<stdio.h>", "<cstdio>"} },
 100     {"fpos_t", {"<stdio.h>", "<cstdio>"} },
 101     {"stderr", {"<stdio.h>", "<cstdio>"} },
 102     {"stdin", {"<stdio.h>", "<cstdio>"} },
 103     {"stdout", {"<stdio.h>", "<cstdio>"} },
 104
 105     /* <stdint.h>.  */
 106     {"PTRDIFF_MAX", {"<stdint.h>", "<cstdint>"} },
 107     {"PTRDIFF_MIN", {"<stdint.h>", "<cstdint>"} },
 108     {"SIG_ATOMIC_MAX", {"<stdint.h>", "<cstdint>"} },
 109     {"SIG_ATOMIC_MIN", {"<stdint.h>", "<cstdint>"} },
 110     {"SIZE_MAX", {"<stdint.h>", "<cstdint>"} },
 111     {"WINT_MAX", {"<stdint.h>", "<cstdint>"} },
 112     {"WINT_MIN", {"<stdint.h>", "<cstdint>"} },
 113
 114     /* <wchar.h>.  */
 115     {"WCHAR_MAX", {"<wchar.h>", "<cwchar>"} },
 116     {"WCHAR_MIN", {"<wchar.h>", "<cwchar>"} }
 117   };
 118   const size_t num_hints = sizeof (hints) / sizeof (hints[0]);
 119   for (size_t i = 0; i < num_hints; i++)
 120     if (0 == strcmp (name, hints[i].name))
 121       return hints[i].header[lib];
 122   return NULL;
 123 }
 124
 125 /* Given non-NULL NAME, return the header name defining it within the C
 126    standard library (with '<' and '>'), or NULL.  */
 127
 128 const char *
 129 get_c_stdlib_header_for_name (const char *name)
 130 {
 131   return get_stdlib_header_for_name (name, STDLIB_C);
 132 }
 133
 134 /* Given non-NULL NAME, return the header name defining it within the C++
 135    standard library (with '<' and '>'), or NULL.  */
 136
 137 const char *
 138 get_cp_stdlib_header_for_name (const char *name)
 139 {
 140   return get_stdlib_header_for_name (name, STDLIB_CPLUSPLUS);
 141 }
 142
 143 /* Implementation of class suggest_missing_header.  */
 144
 145 /* suggest_missing_header's ctor.  */
 146
 147 suggest_missing_header::suggest_missing_header (location_t loc,
 148                                                 const char *name,
 149                                                 const char *header_hint)
 150 : deferred_diagnostic (loc), m_name_str (name), m_header_hint (header_hint)
 151 {
 152   gcc_assert (name);
 153   gcc_assert (header_hint);
 154 }
 155
 156 /* suggest_missing_header's dtor.  */
 157
 158 suggest_missing_header::~suggest_missing_header ()
 159 {
 160   if (is_suppressed_p ())
 161     return;
 162
 163   gcc_rich_location richloc (get_location ());
 164   maybe_add_include_fixit (&richloc, m_header_hint);
 165   inform (&richloc,
 166           "%qs is defined in header %qs;"
 167           " did you forget to %<#include %s%>?",
 168           m_name_str, m_header_hint, m_header_hint);
 169 }