nsz Git - cparser/blob - warning.c

   1 /*
   2  * This file is part of cparser.
   3  * Copyright (C) 2012 Matthias Braun <matze@braunis.de>
   4  */
   5 #include <assert.h>
   6 #include <stdio.h>
   7 #include <string.h>
   8
   9 #include "adt/strutil.h"
  10 #include "adt/util.h"
  11 #include "warning.h"
  12 #include "help.h"
  13
  14 static warning_switch_t warning[] = {
  15         [WARN_ADDRESS]                       = { WARN_STATE_ON,   "address"                       },
  16         [WARN_AGGREGATE_RETURN]              = { WARN_STATE_NONE, "aggregate-return"              },
  17         [WARN_ATTRIBUTE]                     = { WARN_STATE_ON,   "attribute"                     },
  18         [WARN_CAST_QUAL]                     = { WARN_STATE_NONE, "cast-qual",                    },
  19         [WARN_CHAR_SUBSCRIPTS]               = { WARN_STATE_ON,   "char-subscripts",              },
  20         [WARN_COMMENT]                       = { WARN_STATE_NONE, "comment",                      },
  21         [WARN_CONVERSION]                    = { WARN_STATE_NONE, "conversion",                   },
  22         [WARN_DECLARATION_AFTER_STATEMENT]   = { WARN_STATE_NONE, "declaration-after-statement",  },
  23         [WARN_DEPRECATED_DECLARATIONS]       = { WARN_STATE_ON,   "deprecated-declarations",      },
  24         [WARN_DIV_BY_ZERO]                   = { WARN_STATE_ON,   "div-by-zero",                  },
  25         [WARN_EMPTY_BODY]                    = { WARN_STATE_NONE, "empty-body",                   },
  26         [WARN_EMPTY_STATEMENT]               = { WARN_STATE_NONE, "empty-statement",              },
  27         [WARN_ERROR]                         = { WARN_STATE_NONE, "error"                         },
  28         [WARN_FATAL_ERRORS]                  = { WARN_STATE_NONE, "fatal-errors"                  },
  29         [WARN_FLOAT_EQUAL]                   = { WARN_STATE_NONE, "float-equal",                  },
  30         [WARN_FORMAT]                        = { WARN_STATE_ON,   "format"                        },
  31         [WARN_IGNORED_QUALIFIERS]            = { WARN_STATE_ON,   "ignored-qualifiers"            },
  32         [WARN_IMPLICIT_FUNCTION_DECLARATION] = { WARN_STATE_ON,   "implicit-function-declaration" },
  33         [WARN_IMPLICIT_INT]                  = { WARN_STATE_ON,   "implicit-int"                  },
  34         [WARN_LONG_LONG]                     = { WARN_STATE_NONE, "long-long"                     },
  35         [WARN_MAIN]                          = { WARN_STATE_ON,   "main",                         },
  36         [WARN_MISSING_DECLARATIONS]          = { WARN_STATE_NONE, "missing-declarations",         },
  37         [WARN_MISSING_NORETURN]              = { WARN_STATE_NONE, "missing-noreturn",             },
  38         [WARN_MISSING_PROTOTYPES]            = { WARN_STATE_NONE, "missing-prototypes",           },
  39         [WARN_MULTICHAR]                     = { WARN_STATE_ON,   "multichar",                    },
  40         [WARN_NESTED_EXTERNS]                = { WARN_STATE_NONE, "nested-externs"                },
  41         [WARN_NONNULL]                       = { WARN_STATE_ON,   "nonnull",                      },
  42         [WARN_OLD_STYLE_DEFINITION]          = { WARN_STATE_NONE, "old-style-definition",         },
  43         [WARN_OTHER]                         = { WARN_STATE_ON,   "other"                         },
  44         [WARN_PACKED]                        = { WARN_STATE_NONE, "packed",                       },
  45         [WARN_PADDED]                        = { WARN_STATE_NONE, "padded",                       },
  46         [WARN_PARENTHESES]                   = { WARN_STATE_NONE, "parentheses",                  },
  47         [WARN_POINTER_ARITH]                 = { WARN_STATE_ON,   "pointer-arith",                },
  48         [WARN_REDUNDANT_DECLS]               = { WARN_STATE_ON,   "redundant-decls",              },
  49         [WARN_RETURN_TYPE]                   = { WARN_STATE_ON,   "return-type",                  },
  50         [WARN_SHADOW]                        = { WARN_STATE_NONE, "shadow",                       },
  51         [WARN_SHADOW_LOCAL]                  = { WARN_STATE_NONE, "shadow-local",                 },
  52         [WARN_SIGN_COMPARE]                  = { WARN_STATE_NONE, "sign-compare",                 },
  53         [WARN_STRAY_SEMICOLON]               = { WARN_STATE_ON,   "stray-semicolon",              },
  54         [WARN_STRICT_PROTOTYPES]             = { WARN_STATE_ON,   "strict-prototypes"             },
  55         [WARN_SWITCH_DEFAULT]                = { WARN_STATE_NONE, "switch-default",               },
  56         [WARN_SWITCH_ENUM]                   = { WARN_STATE_NONE, "switch-enum",                  },
  57         [WARN_TRADITIONAL]                   = { WARN_STATE_NONE, "traditional"                   },
  58         [WARN_UNINITIALIZED]                 = { WARN_STATE_ON,   "uninitialized",                },
  59         [WARN_UNKNOWN_PRAGMAS]               = { WARN_STATE_ON,   "unknown-pragmas",              },
  60         [WARN_UNREACHABLE_CODE]              = { WARN_STATE_NONE, "unreachable-code"              },
  61         [WARN_UNUSED_FUNCTION]               = { WARN_STATE_NONE, "unused-function",              },
  62         [WARN_UNUSED_LABEL]                  = { WARN_STATE_NONE, "unused-label",                 },
  63         [WARN_UNUSED_PARAMETER]              = { WARN_STATE_NONE, "unused-parameter",             },
  64         [WARN_UNUSED_VALUE]                  = { WARN_STATE_ON,   "unused-value",                 },
  65         [WARN_UNUSED_VARIABLE]               = { WARN_STATE_NONE, "unused-variable",              },
  66         [WARN_WRITE_STRINGS]                 = { WARN_STATE_NONE, "write-strings",                },
  67 };
  68
  69 warning_switch_t const *get_warn_switch(warning_t const w)
  70 {
  71         assert((size_t)w < lengthof(warning));
  72         assert(warning[w].name);
  73         return &warning[w];
  74 }
  75
  76 void print_warning_opt_help(void)
  77 {
  78         /* TODO: write explanations */
  79         for (warning_switch_t* i = warning; i != endof(warning); ++i) {
  80                 char buf[256];
  81                 snprintf(buf, sizeof(buf), "-W%s", i->name);
  82                 put_help(buf, "");
  83         }
  84 }
  85
  86 void set_warning_opt(const char *const opt)
  87 {
  88         /* Process prefixes: -W[no-][error=] */
  89         char const *s     = opt;
  90         char const *rest;
  91         bool const  no    = (rest = strstart(s, "no-"))    ? s = rest, true : false;
  92         bool const  error = (rest = strstart(s, "error=")) ? s = rest, true : false;
  93
  94         warn_state_t on  = WARN_STATE_NONE;
  95         warn_state_t off = WARN_STATE_NONE;
  96         if (!no || !error)
  97                 on |= WARN_STATE_ON;
  98         if (error) {
  99                 on  |= WARN_STATE_ERROR;
 100                 off |= WARN_STATE_NO_ERROR;
 101         }
 102         if (no) {
 103                 warn_state_t const tmp = on;
 104                 on  = off;
 105                 off = tmp;
 106         }
 107
 108         for (warning_switch_t* i = warning; i != endof(warning); ++i) {
 109                 if (streq(i->name, s)) {
 110                         i->state = (i->state & ~off) | on;
 111                         return;
 112                 }
 113         }
 114
 115         if (s[0] == '\0') { // -W is an alias for -Wextra
 116                 goto extra;
 117         }
 118 #define OPTX(x)   else if (streq(s, x))
 119 #define SET(y)    (void)(warning[y].state = (warning[y].state & ~off) | on)
 120         OPTX("all") {
 121                 /* Note: this switched on a lot more warnings than gcc's -Wall */
 122                 SET(WARN_ADDRESS);
 123                 SET(WARN_ATTRIBUTE);
 124                 SET(WARN_CHAR_SUBSCRIPTS);
 125                 SET(WARN_COMMENT);
 126                 SET(WARN_EMPTY_STATEMENT);
 127                 SET(WARN_FORMAT);
 128                 SET(WARN_IMPLICIT_FUNCTION_DECLARATION);
 129                 SET(WARN_IMPLICIT_INT);
 130                 SET(WARN_MAIN);
 131                 SET(WARN_MISSING_DECLARATIONS);
 132                 SET(WARN_NONNULL);
 133                 SET(WARN_OTHER);
 134                 SET(WARN_PARENTHESES);
 135                 SET(WARN_POINTER_ARITH);
 136                 SET(WARN_REDUNDANT_DECLS);
 137                 SET(WARN_RETURN_TYPE);
 138                 SET(WARN_SHADOW_LOCAL);
 139                 SET(WARN_SIGN_COMPARE);
 140                 SET(WARN_STRICT_PROTOTYPES);
 141                 SET(WARN_SWITCH_ENUM);
 142                 SET(WARN_UNINITIALIZED);
 143                 SET(WARN_UNKNOWN_PRAGMAS);
 144                 SET(WARN_UNREACHABLE_CODE);
 145                 SET(WARN_UNUSED_FUNCTION);
 146                 SET(WARN_UNUSED_LABEL);
 147                 SET(WARN_UNUSED_PARAMETER);
 148                 SET(WARN_UNUSED_VALUE);
 149                 SET(WARN_UNUSED_VARIABLE);
 150         }
 151         OPTX("extra") {
 152 extra:
 153                 /* TODO */
 154                 // TODO SET(function_end_without_return);
 155                 SET(WARN_EMPTY_STATEMENT);
 156                 // TODO SET(incomplete_aggregate_init);
 157                 // TODO SET(missing_field_initializers);
 158                 // TODO SET(pointless_comparison);
 159                 SET(WARN_SHADOW);
 160                 SET(WARN_UNUSED_PARAMETER);
 161                 SET(WARN_UNUSED_VALUE);
 162         }
 163         OPTX("implicit") {
 164                 SET(WARN_IMPLICIT_FUNCTION_DECLARATION);
 165                 SET(WARN_IMPLICIT_INT);
 166         }
 167         OPTX("unused") {
 168                 SET(WARN_UNUSED_FUNCTION);
 169                 SET(WARN_UNUSED_LABEL);
 170                 SET(WARN_UNUSED_PARAMETER);
 171                 SET(WARN_UNUSED_VALUE);
 172                 SET(WARN_UNUSED_VARIABLE);
 173         }
 174 #undef SET
 175 #undef OPT_X
 176         else if (streq(opt /* sic */, "error-implicit-function-declaration")) {
 177                 /* GCC legacy: This way it only can be activated. */
 178                 warning[WARN_IMPLICIT_FUNCTION_DECLARATION].state = WARN_STATE_ON | WARN_STATE_ERROR;
 179                 return;
 180         }
 181         else {
 182                 fprintf(stderr, "warning: ignoring unknown option -W%s\n", opt);
 183         }
 184 }
 185
 186 void disable_all_warnings(void)
 187 {
 188         for (warning_switch_t* i = warning; i != endof(warning); ++i) {
 189                 if (i != &warning[WARN_ERROR] &&
 190                     i != &warning[WARN_FATAL_ERRORS]) {
 191                         i->state &= ~WARN_STATE_ON;
 192                 }
 193         }
 194 }