smatch.c

   1 /*
   2  * Copyright (C) 2006 Dan Carpenter.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version 2
   7  * of the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, see http://www.gnu.org/copyleft/gpl.txt
  16  */
  17
  18 #include <stdio.h>
  19 #include <unistd.h>
  20 #include <libgen.h>
  21 #include "smatch.h"
  22 #include "smatch_slist.h"
  23 #include "check_list.h"
  24
  25 char *option_debug_check = (char *)"";
  26 char *option_project_str = (char *)"smatch_generic";
  27 static char *option_db_file = (char *)"smatch_db.sqlite";
  28 enum project_type option_project = PROJ_NONE;
  29 char *bin_dir;
  30 char *data_dir;
  31 int option_no_data = 0;
  32 int option_spammy = 0;
  33 int option_info = 0;
  34 int option_full_path = 0;
  35 int option_param_mapper = 0;
  36 int option_call_tree = 0;
  37 int option_no_db = 0;
  38 int option_enable = 0;
  39 int option_disable = 0;
  40 int option_debug_related;
  41 int option_file_output;
  42 int option_time;
  43 int option_mem;
  44 char *option_datadir_str;
  45 int option_fatal_checks;
  46 int option_succeed;
  47
  48 FILE *sm_outfd;
  49 FILE *sql_outfd;
  50 FILE *caller_info_fd;
  51
  52 int sm_nr_errors;
  53 int sm_nr_checks;
  54
  55 bool __silence_warnings_for_stmt;
  56
  57 typedef void (*reg_func) (int id);
  58 #define CK(_x) {.name = #_x, .func = &_x, .enabled = 0},
  59 static struct reg_func_info {
  60         const char *name;
  61         reg_func func;
  62         int enabled;
  63 } reg_funcs[] = {
  64         {NULL, NULL},
  65 #include "check_list.h"
  66 };
  67 #undef CK
  68 int num_checks = ARRAY_SIZE(reg_funcs) - 1;
  69
  70 const char *check_name(unsigned short id)
  71 {
  72         if (id >= ARRAY_SIZE(reg_funcs))
  73                 return "internal";
  74
  75         return reg_funcs[id].name;
  76 }
  77
  78 int id_from_name(const char *name)
  79 {
  80         int i;
  81
  82         for (i = 1; i < ARRAY_SIZE(reg_funcs); i++) {
  83                 if (!strcmp(name, reg_funcs[i].name))
  84                         return i;
  85         }
  86         return 0;
  87 }
  88
  89 static void show_checks(void)
  90 {
  91         int i;
  92
  93         for (i = 1; i < ARRAY_SIZE(reg_funcs); i++) {
  94                 if (!strncmp(reg_funcs[i].name, "check_", 6))
  95                         printf("%3d. %s\n", i, reg_funcs[i].name);
  96         }
  97         exit(0);
  98 }
  99
 100 static void enable_disable_checks(char *s, bool enable)
 101 {
 102         char buf[128];
 103         char *next;
 104         int i;
 105
 106         do {
 107                 next = strchr(s, ',');
 108                 if (next) {
 109                         *next = '\0';
 110                         next++;
 111                 }
 112                 if (*s == '\0')
 113                         return;
 114                 if (strncmp(s, "check_", 6) == 0)
 115                         snprintf(buf, sizeof(buf), "%s", s);
 116                 else
 117                         snprintf(buf, sizeof(buf), "check_%s", s);
 118
 119
 120                 for (i = 1; i < ARRAY_SIZE(reg_funcs); i++) {
 121                         if (strcmp(reg_funcs[i].name, buf) == 0) {
 122                                 reg_funcs[i].enabled = (enable == true) ? 1 : -1;
 123                                 break;
 124                         }
 125                 }
 126
 127                 if (i == ARRAY_SIZE(reg_funcs))
 128                         sm_fatal("'%s' not found", s);
 129
 130         } while ((s = next));
 131 }
 132
 133 static void help(void)
 134 {
 135         printf("Usage:  smatch [smatch arguments][sparse arguments] file.c\n");
 136         printf("--project=<name> or -p=<name>: project specific tests\n");
 137         printf("--succeed: don't exit with an error\n");
 138         printf("--spammy:  print superfluous crap.\n");
 139         printf("--info:  print info used to fill smatch_data/.\n");
 140         printf("--debug:  print lots of debug output.\n");
 141         printf("--param-mapper:  enable param_mapper output.\n");
 142         printf("--no-data:  do not use the /smatch_data/ directory.\n");
 143         printf("--data=<dir>: overwrite path to default smatch data directory.\n");
 144         printf("--full-path:  print the full pathname.\n");
 145         printf("--debug-implied:  print debug output about implications.\n");
 146         printf("--assume-loops:  assume loops always go through at least once.\n");
 147         printf("--two-passes:  use a two pass system for each function.\n");
 148         printf("--file-output:  instead of printing stdout, print to \"file.c.smatch_out\".\n");
 149         printf("--fatal-checks: check output is treated as an error.\n");
 150         printf("--help:  print this helpful message.\n");
 151         exit(1);
 152 }
 153
 154 static int match_option(const char *arg, const char *option)
 155 {
 156         char *str;
 157         char *tmp;
 158         int ret = 0;
 159
 160         str = malloc(strlen(option) + 3);
 161         snprintf(str, strlen(option) + 3, "--%s", option);
 162         tmp = str;
 163         while (*tmp) {
 164                 if (*tmp == '_')
 165                         *tmp = '-';
 166                 tmp++;
 167         }
 168         if (!strcmp(arg, str))
 169                 ret = 1;
 170         free(str);
 171         return ret;
 172 }
 173
 174 #define OPTION(_x) do {                                 \
 175         if (!found && match_option((*argvp)[1], #_x)) { \
 176                 found = 1;                              \
 177                 option_##_x = 1;                                        \
 178                 (*argvp)[1] = (*argvp)[0];              \
 179         }                                               \
 180 } while (0)
 181
 182 void parse_args(int *argcp, char ***argvp)
 183 {
 184         while (*argcp >= 2) {
 185                 int found = 0;
 186                 if (!strcmp((*argvp)[1], "--help"))
 187                         help();
 188
 189                 if (!strcmp((*argvp)[1], "--show-checks"))
 190                         show_checks();
 191
 192                 if (!found && !strncmp((*argvp)[1], "--project=", 10)) {
 193                         option_project_str = (*argvp)[1] + 10;
 194                         (*argvp)[1] = (*argvp)[0];
 195                         found = 1;
 196                 }
 197                 if (!found && !strncmp((*argvp)[1], "-p=", 3)) {
 198                         option_project_str = (*argvp)[1] + 3;
 199                         (*argvp)[1] = (*argvp)[0];
 200                         found = 1;
 201                 }
 202                 if (!found && !strncmp((*argvp)[1], "--db-file=", 10)) {
 203                         option_db_file = (*argvp)[1] + 10;
 204                         (*argvp)[1] = (*argvp)[0];
 205                         found = 1;
 206                 }
 207                 if (!found && !strncmp((*argvp)[1], "--data=", 7)) {
 208                         option_datadir_str = (*argvp)[1] + 7;
 209                         (*argvp)[1] = (*argvp)[0];
 210                         found = 1;
 211                 }
 212                 if (!found && !strncmp((*argvp)[1], "--debug=", 8)) {
 213                         option_debug_check = (*argvp)[1] + 8;
 214                         (*argvp)[1] = (*argvp)[0];
 215                         found = 1;
 216                 }
 217                 if (!found && strncmp((*argvp)[1], "--trace=", 8) == 0) {
 218                         trace_variable = (*argvp)[1] + 8;
 219                         (*argvp)[1] = (*argvp)[0];
 220                         found = 1;
 221                 }
 222                 if (!found && strncmp((*argvp)[1], "--enable=", 9) == 0) {
 223                         enable_disable_checks((*argvp)[1] + 9, 1);
 224                         option_enable = 1;
 225                         (*argvp)[1] = (*argvp)[0];
 226                         found = 1;
 227                 }
 228                 if (!found && strncmp((*argvp)[1], "--disable=", 10) == 0) {
 229                         enable_disable_checks((*argvp)[1] + 10, 0);
 230                         option_enable = 1;
 231                         option_disable = 1;
 232                         (*argvp)[1] = (*argvp)[0];
 233                         found = 1;
 234                 }
 235
 236                 OPTION(fatal_checks);
 237                 OPTION(spammy);
 238                 OPTION(info);
 239                 OPTION(debug);
 240                 OPTION(debug_related);
 241                 OPTION(assume_loops);
 242                 OPTION(no_data);
 243                 OPTION(two_passes);
 244                 OPTION(full_path);
 245                 OPTION(param_mapper);
 246                 OPTION(call_tree);
 247                 OPTION(file_output);
 248                 OPTION(time);
 249                 OPTION(mem);
 250                 OPTION(no_db);
 251                 OPTION(succeed);
 252                 if (!found)
 253                         break;
 254                 (*argcp)--;
 255                 (*argvp)++;
 256         }
 257
 258         if (strcmp(option_project_str, "smatch_generic") != 0)
 259                 option_project = PROJ_UNKNOWN;
 260
 261         if (strcmp(option_project_str, "kernel") == 0)
 262                 option_project = PROJ_KERNEL;
 263         else if (strcmp(option_project_str, "wine") == 0)
 264                 option_project = PROJ_WINE;
 265         else if (strcmp(option_project_str, "illumos_kernel") == 0)
 266                 option_project = PROJ_ILLUMOS_KERNEL;
 267         else if (strcmp(option_project_str, "illumos_user") == 0)
 268                 option_project = PROJ_ILLUMOS_USER;
 269 }
 270
 271 static char *read_bin_filename(void)
 272 {
 273         char filename[PATH_MAX] = {};
 274         char proc[PATH_MAX];
 275
 276         pid_t pid = getpid();
 277         sprintf(proc, "/proc/%d/exe", pid);
 278         if (readlink(proc, filename, PATH_MAX) < 0)
 279                 return NULL;
 280         return alloc_string(filename);
 281 }
 282
 283 static char *get_bin_dir(char *arg0)
 284 {
 285         char *orig;
 286
 287         orig = read_bin_filename();
 288         if (!orig)
 289                 orig = alloc_string(arg0);
 290         return dirname(orig);
 291 }
 292
 293 static char *get_data_dir(char *arg0)
 294 {
 295         char buf[256];
 296         char *dir;
 297
 298         if (option_no_data)
 299                 return NULL;
 300
 301         if (option_datadir_str) {
 302                 if (access(option_datadir_str, R_OK))
 303                         sm_warning("%s is not accessible -- ignored.",
 304                                         option_datadir_str);
 305                 else
 306                         return alloc_string(option_datadir_str);
 307         }
 308
 309         strncpy(buf, "smatch_data/", sizeof(buf));
 310         dir = alloc_string(buf);
 311         if (!access(dir, R_OK))
 312                 return dir;
 313
 314         strncpy(buf, bin_dir, 254);
 315
 316         buf[255] = '\0';
 317         strncat(buf, "/smatch_data/", 254 - strlen(buf));
 318         dir = alloc_string(buf);
 319         if (!access(dir, R_OK))
 320                 return dir;
 321         free_string(dir);
 322         snprintf(buf, 254, "%s/smatch_data/", SMATCHDATADIR);
 323         dir = alloc_string(buf);
 324         if (!access(dir, R_OK))
 325                 return dir;
 326
 327         sm_warning("%s is not accessible.", dir);
 328         sm_warning("Use --no-data or --data to suppress this message.");
 329         return NULL;
 330 }
 331
 332 int main(int argc, char **argv)
 333 {
 334         int i;
 335         reg_func func;
 336
 337         sm_outfd = stdout;
 338         sql_outfd = stdout;
 339         caller_info_fd = stdout;
 340
 341         parse_args(&argc, &argv);
 342
 343         if (argc < 2)
 344                 help();
 345
 346         /* this gets set back to zero when we parse the first function */
 347         final_pass = 1;
 348
 349         bin_dir = get_bin_dir(argv[0]);
 350         data_dir = get_data_dir(argv[0]);
 351
 352         allocate_hook_memory();
 353         allocate_dynamic_states_array(num_checks);
 354         create_function_hook_hash();
 355         open_smatch_db(option_db_file);
 356         for (i = 1; i < ARRAY_SIZE(reg_funcs); i++) {
 357                 func = reg_funcs[i].func;
 358                 /* The script IDs start at 1.
 359                    0 is used for internal stuff. */
 360                 if (!option_enable || reg_funcs[i].enabled == 1 ||
 361                     (option_disable && reg_funcs[i].enabled != -1) ||
 362                     strncmp(reg_funcs[i].name, "register_", 9) == 0)
 363                         func(i);
 364         }
 365
 366         smatch(argc, argv);
 367         free_string(data_dir);
 368
 369         if (option_succeed)
 370                 return 0;
 371         if (sm_nr_errors > 0)
 372                 return 1;
 373         if (sm_nr_checks > 0 && option_fatal_checks)
 374                 return 1;
 375         return 0;
 376 }