smatch_ignore.c

   1 /*
   2  * Copyright (C) 2009 Dan Carpenter.
   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
  21 STATE(ignore);
  22 static struct stree *ignored;
  23 static struct stree *ignored_from_file;
  24
  25 void add_ignore(int owner, const char *name, struct symbol *sym)
  26 {
  27         set_state_stree(&ignored, owner, name, sym, &ignore);
  28 }
  29
  30 int is_ignored(int owner, const char *name, struct symbol *sym)
  31 {
  32         return !!get_state_stree(ignored, owner, name, sym);
  33 }
  34
  35 void add_ignore_expr(int owner, struct expression *expr)
  36 {
  37         struct symbol *sym;
  38         char *name;
  39
  40         name = expr_to_str_sym(expr, &sym);
  41         if (!name || !sym)
  42                 return;
  43         add_ignore(owner, name, sym);
  44         free_string(name);
  45 }
  46
  47 int is_ignored_expr(int owner, struct expression *expr)
  48 {
  49         struct symbol *sym;
  50         char *name;
  51         int ret;
  52
  53         name = expr_to_str_sym(expr, &sym);
  54         if (!name && !sym)
  55                 return 0;
  56         ret = is_ignored(owner, name, sym);
  57         free_string(name);
  58         if (ret)
  59                 return true;
  60
  61         name = get_macro_name(expr->pos);
  62         if (name && get_state_stree(ignored_from_file, owner, name, NULL))
  63                 return true;
  64
  65         name = get_function();
  66         if (name && get_state_stree(ignored_from_file, owner, name, NULL))
  67                 return true;
  68
  69         return false;
  70 }
  71
  72 static void clear_ignores(void)
  73 {
  74         if (__inline_fn)
  75                 return;
  76         free_stree(&ignored);
  77 }
  78
  79 static void load_ignores(void)
  80 {
  81         struct token *token;
  82         const char *name, *str;
  83         int owner;
  84         char buf[64];
  85
  86         snprintf(buf, sizeof(buf), "%s.ignored_warnings", option_project_str);
  87         token = get_tokens_file(buf);
  88         if (!token)
  89                 return;
  90         if (token_type(token) != TOKEN_STREAMBEGIN)
  91                 return;
  92         token = token->next;
  93         while (token_type(token) != TOKEN_STREAMEND) {
  94                 if (token_type(token) != TOKEN_IDENT)
  95                         break;
  96                 name = show_ident(token->ident);
  97                 token = token->next;
  98                 owner = id_from_name(name);
  99
 100                 if (token_type(token) != TOKEN_IDENT)
 101                         break;
 102                 str = show_ident(token->ident);
 103                 token = token->next;
 104
 105                 set_state_stree_perm(&ignored_from_file, owner, str, NULL, &ignore);
 106         }
 107         clear_token_alloc();
 108 }
 109
 110 void register_smatch_ignore(int id)
 111 {
 112         add_hook(&clear_ignores, AFTER_FUNC_HOOK);
 113         load_ignores();
 114 }