check_nospec.c

   1 /*
   2  * Copyright (C) 2018 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 <stdlib.h>
  19 #include "parse.h"
  20 #include "smatch.h"
  21 #include "smatch_slist.h"
  22 #include "smatch_extra.h"
  23
  24 static int my_id;
  25
  26 STATE(nospec);
  27
  28 bool is_nospec(struct expression *expr)
  29 {
  30         char *macro;
  31
  32         if (get_state_expr(my_id, expr) == &nospec)
  33                 return true;
  34         macro = get_macro_name(expr->pos);
  35         if (macro && strcmp(macro, "array_index_nospec") == 0)
  36                 return true;
  37         return false;
  38 }
  39
  40 static void nospec_assign(struct expression *expr)
  41 {
  42         if (is_nospec(expr->right))
  43                 set_state_expr(my_id, expr->left, &nospec);
  44 }
  45
  46 static void set_param_nospec(const char *name, struct symbol *sym, char *key, char *value)
  47 {
  48         char fullname[256];
  49
  50         if (strcmp(key, "*$") == 0)
  51                 snprintf(fullname, sizeof(fullname), "*%s", name);
  52         else if (strncmp(key, "$", 1) == 0)
  53                 snprintf(fullname, 256, "%s%s", name, key + 1);
  54         else
  55                 return;
  56
  57         set_state(my_id, fullname, sym, &nospec);
  58 }
  59
  60 static void match_call_info(struct expression *expr)
  61 {
  62         struct expression *arg;
  63         int i = 0;
  64
  65         FOR_EACH_PTR(expr->args, arg) {
  66                 if (get_state_expr(my_id, arg) == &nospec)
  67                         sql_insert_caller_info(expr, NOSPEC, i, "$", "");
  68                 i++;
  69         } END_FOR_EACH_PTR(arg);
  70 }
  71
  72 static void struct_member_callback(struct expression *call, int param, char *printed_name, struct sm_state *sm)
  73 {
  74         sql_insert_caller_info(call, NOSPEC, param, printed_name, "");
  75 }
  76
  77 static void returned_struct_members(int return_id, char *return_ranges, struct expression *expr)
  78 {
  79         struct symbol *returned_sym;
  80         struct sm_state *sm;
  81         const char *param_name;
  82         int param;
  83
  84         returned_sym = expr_to_sym(expr);
  85
  86         FOR_EACH_MY_SM(my_id, __get_cur_stree(), sm) {
  87                 param = get_param_num_from_sym(sm->sym);
  88                 if (param < 0) {
  89                         if (!returned_sym || returned_sym != sm->sym)
  90                                 continue;
  91                         param = -1;
  92                 }
  93
  94                 param_name = get_param_name(sm);
  95                 if (!param_name)
  96                         continue;
  97                 if (param != -1 && strcmp(param_name, "$") == 0)
  98                         continue;
  99
 100                 sql_insert_return_states(return_id, return_ranges, NOSPEC, param, param_name, "");
 101         } END_FOR_EACH_SM(sm);
 102 }
 103
 104 void check_nospec(int id)
 105 {
 106         my_id = id;
 107
 108         add_hook(&nospec_assign, ASSIGNMENT_HOOK);
 109
 110         select_caller_info_hook(set_param_nospec, NOSPEC);
 111
 112
 113         add_hook(&match_call_info, FUNCTION_CALL_HOOK);
 114         add_member_info_callback(my_id, struct_member_callback);
 115         add_split_return_callback(&returned_struct_members);
 116 }