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