smatch_array_values.c

   1 /*
   2  * Copyright (C) 2018 Oracle.  All rights reserved.
   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_extra.h"
  20
  21 static int my_id;
  22
  23 static int get_vals(void *_db_vals, int argc, char **argv, char **azColName)
  24 {
  25         char **db_vals = _db_vals;
  26
  27         *db_vals = alloc_string(argv[0]);
  28         return 0;
  29 }
  30
  31 int get_array_rl(struct expression *expr, struct range_list **rl)
  32 {
  33         struct expression *array;
  34         struct symbol *type;
  35         char buf[128];
  36         char *rl_str = NULL;
  37         char *name;
  38
  39         array = get_array_base(expr);
  40         if (!array || array->type != EXPR_SYMBOL || !array->symbol)
  41                 return 0;
  42         if (!(array->symbol->ctype.modifiers & MOD_TOPLEVEL) ||
  43             !(array->symbol->ctype.modifiers & MOD_STATIC))
  44                 return 0;
  45
  46         type = get_type(expr);
  47         if (!type || type->type != SYM_BASETYPE)
  48                 return 0;
  49
  50         name = expr_to_str(array);
  51         snprintf(buf, sizeof(buf), "%s[]", name);
  52         free_string(name);
  53
  54         run_sql(&get_vals, &rl_str,
  55                 "select value from sink_info where file = '%s' and static = 1 and sink_name = '%s' and type = %d;",
  56                 get_filename(), buf, DATA_VALUE);
  57         if (!rl_str)
  58                 return 0;
  59
  60         str_to_rl(type, rl_str, rl);
  61         free_string(rl_str);
  62         return 1;
  63 }
  64
  65 static struct range_list *get_saved_rl(struct symbol *type, char *name)
  66 {
  67         struct range_list *rl;
  68         char *str = NULL;
  69
  70         cache_sql(&get_vals, &str, "select value from sink_info where file = '%s' and static = 1 and sink_name = '%s' and type = %d;",
  71                   get_filename(), name, DATA_VALUE);
  72         if (!str)
  73                 return NULL;
  74
  75         str_to_rl(type, str, &rl);
  76         free_string(str);
  77
  78         return rl;
  79 }
  80
  81 static void update_cache(char *name, struct range_list *rl)
  82 {
  83         cache_sql(NULL, NULL, "delete from sink_info where file = '%s' and static = 1 and sink_name = '%s' and type = %d;",
  84                   get_filename(), name, DATA_VALUE);
  85         cache_sql(NULL, NULL, "insert into sink_info values ('%s', 1, '%s', %d, '', '%s');",
  86                   get_filename(), name, DATA_VALUE, show_rl(rl));
  87 }
  88
  89 static void match_assign(struct expression *expr)
  90 {
  91         struct expression *left, *array;
  92         struct symbol *type;
  93         struct range_list *orig_rl, *rl;
  94         char *name;
  95         char buf[128];
  96
  97         left = strip_expr(expr->left);
  98         if (!is_array(left))
  99                 return;
 100         array = get_array_base(left);
 101         if (!array || array->type != EXPR_SYMBOL || !array->symbol)
 102                 return;
 103         if (!(array->symbol->ctype.modifiers & MOD_TOPLEVEL) ||
 104             !(array->symbol->ctype.modifiers & MOD_STATIC))
 105                 return;
 106         type = get_type(array);
 107         if (!type || type->type != SYM_ARRAY)
 108                 return;
 109         type = get_real_base_type(type);
 110         if (!type || type->type != SYM_BASETYPE)
 111                 return;
 112
 113         name = expr_to_str(array);
 114         snprintf(buf, sizeof(buf), "%s[]", name);
 115         free_string(name);
 116
 117         if (expr->op != '=') {
 118                 rl = alloc_whole_rl(type);
 119         } else {
 120                 get_absolute_rl(expr->right, &rl);
 121                 rl = cast_rl(type, rl);
 122                 orig_rl = get_saved_rl(type, buf);
 123                 rl = rl_union(orig_rl, rl);
 124         }
 125
 126         update_cache(buf, rl);
 127 }
 128
 129 void register_array_values(int id)
 130 {
 131         my_id = id;
 132
 133         add_hook(&match_assign, ASSIGNMENT_HOOK);
 134         add_hook(&match_assign, GLOBAL_ASSIGNMENT_HOOK);
 135 }