smatch_data_source.c

   1 /*
   2  * Copyright (C) 2013 Oracle.
   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 "smatch.h"
  19 #include "smatch_slist.h"
  20 #include "smatch_extra.h"
  21
  22 static int my_id;
  23
  24 static char *get_source_parameter(struct expression *expr)
  25 {
  26         struct symbol *sym;
  27         char *name;
  28         int param;
  29         struct sm_state *orig, *cur;
  30         char *ret = NULL;
  31         char buf[32];
  32
  33         name = expr_to_var_sym(expr, &sym);
  34         if (!name || !sym)
  35                 goto out;
  36         param = get_param_num_from_sym(sym);
  37         if (param < 0)
  38                 goto out;
  39         cur = get_sm_state(SMATCH_EXTRA, name, sym);
  40         if (!cur)
  41                 goto out;
  42         orig = get_sm_state_stree(get_start_states(), SMATCH_EXTRA, name, sym);
  43         if (!orig)
  44                 goto out;
  45         if (orig != cur)
  46                 goto out;
  47
  48         snprintf(buf, sizeof(buf), "p %d", param);
  49         ret = alloc_string(buf);
  50
  51 out:
  52         free_string(name);
  53         return ret;
  54 }
  55
  56 static char *get_source_assignment(struct expression *expr)
  57 {
  58         struct expression *right;
  59         char *name;
  60         char buf[64];
  61         char *ret;
  62
  63         right = get_assigned_expr(expr);
  64         right = strip_expr(right);
  65         if (!right)
  66                 return NULL;
  67         if (right->type != EXPR_CALL || right->fn->type != EXPR_SYMBOL)
  68                 return NULL;
  69         if (is_fake_call(right))
  70                 return NULL;
  71         name = expr_to_str(right->fn);
  72         if (!name)
  73                 return NULL;
  74         snprintf(buf, sizeof(buf), "r %s", name);
  75         ret = alloc_string(buf);
  76         free_string(name);
  77         return ret;
  78 }
  79
  80 static char *get_source_str(struct expression *expr)
  81 {
  82         char *source;
  83
  84         source = get_source_parameter(expr);
  85         if (source)
  86                 return source;
  87         return get_source_assignment(expr);
  88 }
  89
  90 static void match_caller_info(struct expression *expr)
  91 {
  92         struct expression *tmp;
  93         char *source;
  94         int i;
  95
  96         i = -1;
  97         FOR_EACH_PTR(expr->args, tmp) {
  98                 i++;
  99                 source = get_source_str(tmp);
 100                 if (!source)
 101                         continue;
 102                 sql_insert_caller_info(expr, DATA_SOURCE, i, "$", source);
 103                 free_string(source);
 104         } END_FOR_EACH_PTR(tmp);
 105 }
 106
 107 void register_data_source(int id)
 108 {
 109         if (!option_info)
 110                 return;
 111         my_id = id;
 112         add_hook(&match_caller_info, FUNCTION_CALL_HOOK);
 113 }