smatch.c

   1 /*
   2  * sparse/smatch.c
   3  *
   4  * Copyright (C) 2006 Dan Carpenter.
   5  *
   6  * Licensed under the Open Software License version 1.1
   7  *
   8  */
   9
  10 #include <stdio.h>
  11 #include <unistd.h>
  12 #include <libgen.h>
  13 #include "smatch.h"
  14
  15 char *data_dir;
  16 int option_no_data = 0;
  17
  18 typedef void (*reg_func) (int id);
  19 void register_smatch_extra(int id);
  20 void register_smatch_ignore(int id);
  21 void register_implications(int id);
  22 void register_function_hooks(int id);
  23 void register_modification_hooks(int id);
  24 void check_debug(int id);
  25 void check_null_deref(int id);
  26 void check_overflow(int id);
  27 void check_locking(int id);
  28 void check_memory(int id);
  29 void check_frees_argument(int id);
  30 void check_puts_argument(int id);
  31 void check_leaks(int id);
  32 void check_type(int id);
  33 void check_allocation_funcs(int id);
  34 void check_err_ptr(int id);
  35 void check_err_ptr_deref(int id);
  36 void check_balanced(int id);
  37 void check_initializer_deref(int id);
  38 void check_deref_check(int id);
  39 /* <- your test goes here */
  40 /* void register_template(int id); */
  41
  42 static const reg_func reg_funcs[] = {
  43         &register_smatch_extra, /* smatch_extra always has to be first */
  44         &register_smatch_ignore,
  45         &check_debug,
  46         &check_null_deref,
  47         &check_overflow,
  48         &check_locking,
  49         &check_memory,
  50         // &check_type,
  51         // &check_allocation_funcs,
  52         // &check_leaks,
  53         // &check_frees_argument,
  54         // &check_puts_argument,
  55         // &check_err_ptr,
  56         &check_err_ptr_deref,
  57         &check_balanced,
  58         &check_initializer_deref,
  59         &check_deref_check,
  60
  61         /* <- your test goes here */
  62         /* &register_template, */
  63
  64         &register_modification_hooks,
  65         &register_implications, /* implications always has to be last */
  66         NULL
  67 };
  68
  69 static void help(void)
  70 {
  71         printf("Usage:  smatch [smatch arguments][sparse arguments] file.c\n");
  72         printf("--debug:  print lots of debug output.\n");
  73         printf("--debug-implied:  print debug output about implications.\n");
  74         printf("--oom <num>:  number of mB memory to use before giving up.\n");
  75         printf("--no-implied:  ignore implications.\n");
  76         printf("--assume-loops:  assume loops always go through at least once.\n");
  77         printf("--known-conditions:  don't branch for known conditions.\n");
  78         printf("--no-data:  do not use the /smatch_data/ directory.\n");
  79         printf("--help:  print this helpfull message.\n");
  80         exit(1);
  81 }
  82
  83 void parse_args(int *argcp, char ***argvp)
  84 {
  85         while(*argcp >= 2) {
  86                 if (!strcmp((*argvp)[1], "--debug")) {
  87                         debug_states = 1;
  88                         (*argvp)[1] = (*argvp)[0];
  89                 } else if (!strcmp((*argvp)[1], "--debug-implied")) {
  90                         debug_implied_states = 1;
  91                         (*argvp)[1] = (*argvp)[0];
  92                 } else if (!strcmp((*argvp)[1], "--oom")) {
  93                         option_oom_kb = atoi((*argvp)[2]) * 1000;
  94                         (*argvp)[2] = (*argvp)[0];
  95                         (*argcp)--;
  96                         (*argvp)++;
  97                 } else if (!strcmp((*argvp)[1], "--no-implied")) {
  98                         option_no_implied = 1;
  99                         (*argvp)[1] = (*argvp)[0];
 100                 } else if (!strcmp((*argvp)[1], "--assume-loops")) {
 101                         option_assume_loops = 1;
 102                         (*argvp)[1] = (*argvp)[0];
 103                 } else if (!strcmp((*argvp)[1], "--known-conditions")) {
 104                         option_known_conditions = 1;
 105                         (*argvp)[1] = (*argvp)[0];
 106                 } else if (!strcmp((*argvp)[1], "--no-data")) {
 107                         option_no_data = 1;
 108                         (*argvp)[1] = (*argvp)[0];
 109                 } else if (!strcmp((*argvp)[1], "--help")) {
 110                         help();
 111                 } else {
 112                         break;
 113                 }
 114                 (*argcp)--;
 115                 (*argvp)++;
 116         }
 117 }
 118
 119 static char *get_data_dir(char *arg0)
 120 {
 121         char *bin_dir;
 122         char buf[256];
 123         char *dir;
 124
 125         if (option_no_data) {
 126                 return NULL;
 127         }
 128         bin_dir = dirname(alloc_string(arg0));
 129         strncpy(buf, bin_dir, 254);
 130         buf[255] = '\0';
 131         strncat(buf, "/smatch_data/", 254 - strlen(buf));
 132         dir = alloc_string(buf);
 133         if (!access(dir, R_OK))
 134                 return dir;
 135         printf("Warning: %s is not accessible.\n", dir);
 136         printf("Use --no-data to suppress this message.\n");
 137         return NULL;
 138 }
 139
 140 int main(int argc, char **argv)
 141 {
 142         int i;
 143         reg_func func;
 144
 145         parse_args(&argc, &argv);
 146
 147         data_dir = get_data_dir(argv[0]);
 148
 149         /* The script IDs start at 1.
 150            0 is used for internal stuff. */
 151         create_function_hash();
 152         for(i = 0; (func = reg_funcs[i]); i++){
 153                 func(i + 1);
 154         }
 155         register_function_hooks(-1);
 156
 157         smatch(argc, argv);
 158         free_string(data_dir);
 159         return 0;
 160 }