smatch.c

   1
   2 /*
   3  * sparse/smatch.c
   4  *
   5  * Copyright (C) 2006 Dan Carpenter.
   6  *
   7  * Licensed under the Open Software License version 1.1
   8  *
   9  */
  10
  11 #include <stdio.h>
  12 #include <unistd.h>
  13 #include <libgen.h>
  14 #include "smatch.h"
  15 #include "check_list.h"
  16
  17 char *option_project_str = (char *)"";
  18 enum project_type option_project = PROJ_NONE;
  19 char *data_dir;
  20 int option_no_data = 0;
  21 int option_spammy = 0;
  22 int option_rare = 0;
  23 int option_info = 0;
  24 int option_full_path = 0;
  25 int option_param_mapper = 0;
  26 int option_call_tree = 0;
  27
  28 typedef void (*reg_func) (int id);
  29 #define CK(_x) {.name = #_x, .func = &_x},
  30 static struct reg_func_info {
  31         const char *name;
  32         reg_func func;
  33 } reg_funcs[] = {
  34 #include "check_list.h"
  35 };
  36 #undef CK
  37 int num_checks = ARRAY_SIZE(reg_funcs);
  38
  39 const char *check_name(unsigned short id)
  40 {
  41         if (id > ARRAY_SIZE(reg_funcs)) {
  42                 return "internal";
  43         }
  44         return reg_funcs[id - 1].name;
  45 }
  46
  47 int id_from_name(const char *name)
  48 {
  49         int i;
  50
  51         for(i = 0; i < ARRAY_SIZE(reg_funcs); i++){
  52                 if (!strcmp(name, reg_funcs[i].name))
  53                         return i + 1;
  54         }
  55         return 0;
  56 }
  57
  58 static void help(void)
  59 {
  60         printf("Usage:  smatch [smatch arguments][sparse arguments] file.c\n");
  61         printf("--project=<name> or -p=<name>: project specific tests\n");
  62         printf("--spammy:  print superfluous crap.\n");
  63         printf("--rare:  do checks for rare bugs.\n");
  64         printf("--info:  print info used to fill smatch_data/.\n");
  65         printf("--debug:  print lots of debug output.\n");
  66         printf("--param-mapper:  enable param_mapper output.\n");
  67         printf("--no-data:  do not use the /smatch_data/ directory.\n");
  68         printf("--full-path:  print the full pathname.\n");
  69         printf("--debug-implied:  print debug output about implications.\n");
  70         printf("--oom <num>:  number of mB memory to use before giving up.\n");
  71         printf("--no-implied:  ignore implications.\n");
  72         printf("--assume-loops:  assume loops always go through at least once.\n");
  73         printf("--known-conditions:  don't branch for known conditions.\n");
  74         printf("--two-passes:  use a two pass system for each function.\n");
  75         printf("--help:  print this helpfull message.\n");
  76         exit(1);
  77 }
  78
  79 static int match_option(const char *arg, const char *option)
  80 {
  81         char *str;
  82         char *tmp;
  83         int ret = 0;
  84
  85         str = malloc(strlen(option) + 3);
  86         sprintf(str, "--%s", option);
  87         tmp = str;
  88         while (*tmp) {
  89                 if (*tmp == '_')
  90                         *tmp = '-';
  91                 tmp++;
  92         }
  93         if (!strcmp(arg, str))
  94                 ret = 1;
  95         free(str);
  96         return ret;
  97 }
  98
  99 #define OPTION(_x) do {                                 \
 100         if (!found && match_option((*argvp)[1], #_x)) { \
 101                 found = 1;                              \
 102                 option_##_x = 1;                                        \
 103                 (*argvp)[1] = (*argvp)[0];              \
 104         }                                               \
 105 } while (0)
 106
 107 void parse_args(int *argcp, char ***argvp)
 108 {
 109         while(*argcp >= 2) {
 110                 int found = 0;
 111                 if (!strcmp((*argvp)[1], "--help")) {
 112                         help();
 113                 }
 114                 if (!found && !strncmp((*argvp)[1], "--project=", 10)) {
 115                         option_project_str = (*argvp)[1] + 10;
 116                         (*argvp)[1] = (*argvp)[0];
 117                         found = 1;
 118                 }
 119                 if (!found && !strncmp((*argvp)[1], "-p=", 3)) {
 120                         option_project_str = (*argvp)[1] + 3;
 121                         (*argvp)[1] = (*argvp)[0];
 122                         found = 1;
 123                 }
 124                 if (!found && !strcmp((*argvp)[1], "--oom")) {
 125                         option_oom_kb = atoi((*argvp)[2]) * 1000;
 126                         (*argvp)[2] = (*argvp)[0];
 127                         (*argcp)--;
 128                         (*argvp)++;
 129                 }
 130                 OPTION(spammy);
 131                 OPTION(rare);
 132                 OPTION(info);
 133                 OPTION(debug);
 134                 OPTION(debug_implied);
 135                 OPTION(no_implied);
 136                 OPTION(assume_loops);
 137                 OPTION(known_conditions);
 138                 OPTION(no_data);
 139                 OPTION(two_passes);
 140                 OPTION(full_path);
 141                 OPTION(param_mapper);
 142                 OPTION(call_tree);
 143                 if (!found)
 144                         break;
 145                 (*argcp)--;
 146                 (*argvp)++;
 147         }
 148
 149         if (!strcmp(option_project_str, "kernel"))
 150                 option_project = PROJ_KERNEL;
 151         if (!strcmp(option_project_str, "wine"))
 152                 option_project = PROJ_WINE;
 153 }
 154
 155 static char *get_data_dir(char *arg0)
 156 {
 157         char *bin_dir;
 158         char buf[256];
 159         char *dir;
 160
 161         if (option_no_data) {
 162                 return NULL;
 163         }
 164         bin_dir = dirname(alloc_string(arg0));
 165         strncpy(buf, bin_dir, 254);
 166         buf[255] = '\0';
 167         strncat(buf, "/smatch_data/", 254 - strlen(buf));
 168         dir = alloc_string(buf);
 169         if (!access(dir, R_OK))
 170                 return dir;
 171         free_string(dir);
 172         snprintf(buf, 254, "%s/smatch_data/", SMATCHDATADIR);
 173         dir = alloc_string(buf);
 174         if (!access(dir, R_OK))
 175                 return dir;
 176         printf("Warning: %s is not accessible.\n", dir);
 177         printf("Use --no-data to suppress this message.\n");
 178         return NULL;
 179 }
 180
 181 int main(int argc, char **argv)
 182 {
 183         int i;
 184         reg_func func;
 185
 186         parse_args(&argc, &argv);
 187
 188         data_dir = get_data_dir(argv[0]);
 189
 190         create_function_hook_hash();
 191         for(i = 0; i < ARRAY_SIZE(reg_funcs); i++){
 192                 func = reg_funcs[i].func;
 193                 /* The script IDs start at 1.
 194                    0 is used for internal stuff. */
 195                 func(i + 1);
 196         }
 197         register_function_hooks(-1);
 198
 199         smatch(argc, argv);
 200         free_string(data_dir);
 201         return 0;
 202 }