nsz Git - cparser/blob - warning.c

   1 /*
   2  * This file is part of cparser.
   3  * Copyright (C) 2007-2009 Matthias Braun <matze@braunis.de>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  18  * 02111-1307, USA.
  19  */
  20 #include <assert.h>
  21 #include <stdio.h>
  22 #include <string.h>
  23
  24 #include "adt/util.h"
  25 #include "warning.h"
  26 #include "help.h"
  27
  28 static warning_switch_t warning[] = {
  29         [WARN_ADDRESS]                       = { WARN_STATE_ON,   "address"                       },
  30         [WARN_AGGREGATE_RETURN]              = { WARN_STATE_NONE, "aggregate-return"              },
  31         [WARN_ATTRIBUTE]                     = { WARN_STATE_ON,   "attribute"                     },
  32         [WARN_CAST_QUAL]                     = { WARN_STATE_NONE, "cast-qual",                    },
  33         [WARN_CHAR_SUBSCRIPTS]               = { WARN_STATE_ON,   "char-subscripts",              },
  34         [WARN_COMMENT]                       = { WARN_STATE_NONE, "comment",                      },
  35         [WARN_CONVERSION]                    = { WARN_STATE_NONE, "conversion",                   },
  36         [WARN_DECLARATION_AFTER_STATEMENT]   = { WARN_STATE_NONE, "declaration-after-statement",  },
  37         [WARN_DEPRECATED_DECLARATIONS]       = { WARN_STATE_ON,   "deprecated-declarations",      },
  38         [WARN_DIV_BY_ZERO]                   = { WARN_STATE_ON,   "div-by-zero",                  },
  39         [WARN_EMPTY_STATEMENT]               = { WARN_STATE_NONE, "empty-statement",              },
  40         [WARN_ERROR]                         = { WARN_STATE_NONE, "error"                         },
  41         [WARN_FATAL_ERRORS]                  = { WARN_STATE_NONE, "fatal-errors"                  },
  42         [WARN_FLOAT_EQUAL]                   = { WARN_STATE_NONE, "float-equal",                  },
  43         [WARN_FORMAT]                        = { WARN_STATE_ON,   "format"                        },
  44         [WARN_IMPLICIT_FUNCTION_DECLARATION] = { WARN_STATE_ON,   "implicit-function-declaration" },
  45         [WARN_IMPLICIT_INT]                  = { WARN_STATE_ON,   "implicit-int"                  },
  46         [WARN_LONG_LONG]                     = { WARN_STATE_NONE, "long-long"                     },
  47         [WARN_MAIN]                          = { WARN_STATE_ON,   "main",                         },
  48         [WARN_MISSING_DECLARATIONS]          = { WARN_STATE_NONE, "missing-declarations",         },
  49         [WARN_MISSING_NORETURN]              = { WARN_STATE_NONE, "missing-noreturn",             },
  50         [WARN_MISSING_PROTOTYPES]            = { WARN_STATE_NONE, "missing-prototypes",           },
  51         [WARN_MULTICHAR]                     = { WARN_STATE_ON,   "multichar",                    },
  52         [WARN_NESTED_EXTERNS]                = { WARN_STATE_NONE, "nested-externs"                },
  53         [WARN_NONNULL]                       = { WARN_STATE_ON,   "nonnull",                      },
  54         [WARN_OLD_STYLE_DEFINITION]          = { WARN_STATE_NONE, "old-style-definition",         },
  55         [WARN_OTHER]                         = { WARN_STATE_ON,   "other"                         },
  56         [WARN_PACKED]                        = { WARN_STATE_NONE, "packed",                       },
  57         [WARN_PADDED]                        = { WARN_STATE_NONE, "padded",                       },
  58         [WARN_PARENTHESES]                   = { WARN_STATE_NONE, "parentheses",                  },
  59         [WARN_POINTER_ARITH]                 = { WARN_STATE_ON,   "pointer-arith",                },
  60         [WARN_REDUNDANT_DECLS]               = { WARN_STATE_ON,   "redundant-decls",              },
  61         [WARN_RETURN_TYPE]                   = { WARN_STATE_ON,   "return-type",                  },
  62         [WARN_SHADOW]                        = { WARN_STATE_NONE, "shadow",                       },
  63         [WARN_SHADOW_LOCAL]                  = { WARN_STATE_NONE, "shadow-local",                 },
  64         [WARN_SIGN_COMPARE]                  = { WARN_STATE_NONE, "sign-compare",                 },
  65         [WARN_STRICT_PROTOTYPES]             = { WARN_STATE_ON,   "strict-prototypes"             },
  66         [WARN_SWITCH_DEFAULT]                = { WARN_STATE_NONE, "switch-default",               },
  67         [WARN_SWITCH_ENUM]                   = { WARN_STATE_NONE, "switch-enum",                  },
  68         [WARN_TRADITIONAL]                   = { WARN_STATE_NONE, "traditional"                   },
  69         [WARN_UNINITIALIZED]                 = { WARN_STATE_ON,   "uninitialized",                },
  70         [WARN_UNKNOWN_PRAGMAS]               = { WARN_STATE_ON,   "unknown-pragmas",              },
  71         [WARN_UNREACHABLE_CODE]              = { WARN_STATE_NONE, "unreachable-code"              },
  72         [WARN_UNUSED_FUNCTION]               = { WARN_STATE_NONE, "unused-function",              },
  73         [WARN_UNUSED_LABEL]                  = { WARN_STATE_NONE, "unused-label",                 },
  74         [WARN_UNUSED_PARAMETER]              = { WARN_STATE_NONE, "unused-parameter",             },
  75         [WARN_UNUSED_VALUE]                  = { WARN_STATE_ON,   "unused-value",                 },
  76         [WARN_UNUSED_VARIABLE]               = { WARN_STATE_NONE, "unused-variable",              },
  77         [WARN_WRITE_STRINGS]                 = { WARN_STATE_NONE, "write-strings",                },
  78 };
  79
  80 warning_switch_t const *get_warn_switch(warning_t const w)
  81 {
  82         assert((size_t)w < lengthof(warning));
  83         assert(warning[w].name);
  84         return &warning[w];
  85 }
  86
  87 void print_warning_opt_help(void)
  88 {
  89         /* TODO: write explanations */
  90         for (warning_switch_t* i = warning; i != endof(warning); ++i) {
  91                 put_help(i->name, "");
  92         }
  93 }
  94
  95 void set_warning_opt(const char *const opt)
  96 {
  97         /* Process prefixes: -W[no-][error=] */
  98         char const *s     = opt;
  99         bool const  no    = strncmp(s, "no-",    3) == 0 ? s += 3, true : false;
 100         bool const  error = strncmp(s, "error=", 6) == 0 ? s += 6, true : false;
 101
 102         warn_state_t on  = WARN_STATE_NONE;
 103         warn_state_t off = WARN_STATE_NONE;
 104         if (!no || !error)
 105                 on |= WARN_STATE_ON;
 106         if (error) {
 107                 on  |= WARN_STATE_ERROR;
 108                 off |= WARN_STATE_NO_ERROR;
 109         }
 110         if (no) {
 111                 warn_state_t const tmp = on;
 112                 on  = off;
 113                 off = tmp;
 114         }
 115
 116         for (warning_switch_t* i = warning; i != endof(warning); ++i) {
 117                 if (strcmp(i->name, s) == 0) {
 118                         i->state = (i->state & ~off) | on;
 119                         return;
 120                 }
 121         }
 122
 123         if (s[0] == '\0') { // -W is an alias for -Wextra
 124                 goto extra;
 125         }
 126 #define OPTX(x)   else if (strcmp(s, x) == 0)
 127 #define SET(y)    (void)(warning[y].state = (warning[y].state & ~off) | on)
 128         OPTX("all") {
 129                 /* Note: this switched on a lot more warnings than gcc's -Wall */
 130                 SET(WARN_ADDRESS);
 131                 SET(WARN_ATTRIBUTE);
 132                 SET(WARN_CHAR_SUBSCRIPTS);
 133                 SET(WARN_COMMENT);
 134                 SET(WARN_EMPTY_STATEMENT);
 135                 SET(WARN_FORMAT);
 136                 SET(WARN_IMPLICIT_FUNCTION_DECLARATION);
 137                 SET(WARN_IMPLICIT_INT);
 138                 SET(WARN_MAIN);
 139                 SET(WARN_MISSING_DECLARATIONS);
 140                 SET(WARN_NONNULL);
 141                 SET(WARN_OTHER);
 142                 SET(WARN_PARENTHESES);
 143                 SET(WARN_POINTER_ARITH);
 144                 SET(WARN_REDUNDANT_DECLS);
 145                 SET(WARN_RETURN_TYPE);
 146                 SET(WARN_SHADOW_LOCAL);
 147                 SET(WARN_SIGN_COMPARE);
 148                 SET(WARN_STRICT_PROTOTYPES);
 149                 SET(WARN_SWITCH_ENUM);
 150                 SET(WARN_UNINITIALIZED);
 151                 SET(WARN_UNKNOWN_PRAGMAS);
 152                 SET(WARN_UNREACHABLE_CODE);
 153                 SET(WARN_UNUSED_FUNCTION);
 154                 SET(WARN_UNUSED_LABEL);
 155                 SET(WARN_UNUSED_PARAMETER);
 156                 SET(WARN_UNUSED_VALUE);
 157                 SET(WARN_UNUSED_VARIABLE);
 158         }
 159         OPTX("extra") {
 160 extra:
 161                 /* TODO */
 162                 // TODO SET(function_end_without_return);
 163                 SET(WARN_EMPTY_STATEMENT);
 164                 // TODO SET(incomplete_aggregate_init);
 165                 // TODO SET(missing_field_initializers);
 166                 // TODO SET(pointless_comparison);
 167                 SET(WARN_SHADOW);
 168                 SET(WARN_UNUSED_PARAMETER);
 169                 SET(WARN_UNUSED_VALUE);
 170         }
 171         OPTX("implicit") {
 172                 SET(WARN_IMPLICIT_FUNCTION_DECLARATION);
 173                 SET(WARN_IMPLICIT_INT);
 174         }
 175         OPTX("unused") {
 176                 SET(WARN_UNUSED_FUNCTION);
 177                 SET(WARN_UNUSED_LABEL);
 178                 SET(WARN_UNUSED_PARAMETER);
 179                 SET(WARN_UNUSED_VALUE);
 180                 SET(WARN_UNUSED_VARIABLE);
 181         }
 182 #undef SET
 183 #undef OPT_X
 184         else if (strcmp(opt /* sic */, "error-implicit-function-declaration") == 0) {
 185                 /* GCC legacy: This way it only can be activated. */
 186                 warning[WARN_IMPLICIT_FUNCTION_DECLARATION].state = WARN_STATE_ON | WARN_STATE_ERROR;
 187                 return;
 188         }
 189         else {
 190                 fprintf(stderr, "warning: ignoring unknown option -W%s\n", opt);
 191         }
 192 }
 193
 194 void disable_all_warnings(void)
 195 {
 196         for (warning_switch_t* i = warning; i != endof(warning); ++i) {
 197                 if (i != &warning[WARN_ERROR] &&
 198                     i != &warning[WARN_FATAL_ERRORS]) {
 199                         i->state &= ~WARN_STATE_ON;
 200                 }
 201         }
 202 }