smatch_param_set.c

   1 /*
   2  * sparse/smatch_param_set.c
   3  *
   4  * Copyright (C) 2012 Oracle.
   5  *
   6  * Licensed under the Open Software License version 1.1
   7  *
   8  */
   9
  10 #include "scope.h"
  11 #include "smatch.h"
  12 #include "smatch_slist.h"
  13 #include "smatch_extra.h"
  14
  15 static int my_id;
  16
  17 static struct smatch_state *unmatched_state(struct sm_state *sm)
  18 {
  19         return alloc_estate_empty();
  20 }
  21
  22 static void extra_mod_hook(const char *name, struct symbol *sym, struct smatch_state *state)
  23 {
  24         set_state(my_id, name, sym, state);
  25 }
  26
  27 static const char *get_param_name(struct sm_state *sm)
  28 {
  29         char *param_name;
  30         int name_len;
  31         static char buf[256];
  32
  33         param_name = sm->sym->ident->name;
  34         name_len = strlen(param_name);
  35
  36         if (sm->name[name_len] == '-' && /* check for '-' from "->" */
  37             strncmp(sm->name, param_name, name_len) == 0) {
  38                 snprintf(buf, sizeof(buf), "$$%s", sm->name + name_len);
  39                 return buf;
  40         } else if (sm->name[0] == '*' && strcmp(sm->name + 1, param_name) == 0) {
  41                 return "*$$";
  42         }
  43         return NULL;
  44 }
  45
  46 static void print_one_return_value_param(int return_id, char *return_ranges,
  47                         int param, struct sm_state *sm, char *implied_rl,
  48                         struct state_list *slist)
  49 {
  50         const char *param_name;
  51
  52         param_name = get_param_name(sm);
  53         if (!param_name)
  54                 return;
  55
  56         sm_msg("info: return_param_add %d %d '%s' '%s' '%s' %s",
  57                return_id, param, return_ranges,
  58                param_name, implied_rl, global_static());
  59 }
  60
  61 static void print_return_value_param(int return_id, char *return_ranges, struct expression *expr, struct state_list *slist)
  62 {
  63         struct state_list *my_slist;
  64         struct sm_state *sm;
  65         struct smatch_state *extra;
  66         int param;
  67         struct range_list *rl;
  68
  69         my_slist = get_all_states_slist(my_id, slist);
  70
  71         FOR_EACH_PTR(my_slist, sm) {
  72                 if (!estate_rl(sm->state))
  73                         continue;
  74                 extra = get_state_slist(slist, SMATCH_EXTRA, sm->name, sm->sym);
  75                 if (!estate_rl(extra))
  76                         continue;
  77                 rl = rl_intersection(estate_rl(sm->state), estate_rl(extra));
  78                 if (!rl)
  79                         continue;
  80
  81                 param = get_param_num_from_sym(sm->sym);
  82                 if (param < 0)
  83                         continue;
  84                 if (!sm->sym->ident)
  85                         continue;
  86                 print_one_return_value_param(return_id, return_ranges, param, sm, show_rl(rl), slist);
  87         } END_FOR_EACH_PTR(sm);
  88 }
  89
  90 void register_param_set(int id)
  91 {
  92         if (!option_info)
  93                 return;
  94
  95         my_id = id;
  96
  97         add_extra_mod_hook(&extra_mod_hook);
  98         add_unmatched_state_hook(my_id, &unmatched_state);
  99         add_merge_hook(my_id, &merge_estates);
 100         add_returned_state_callback(&print_return_value_param);
 101 }
 102