check_le16.c

   1 /*
   2  * smatch/check_le16.c
   3  *
   4  * Copyright (C) 2010 Dan Carpenter.
   5  *
   6  * Licensed under the Open Software License version 1.1
   7  *
   8  */
   9
  10 #include "smatch.h"
  11
  12 static int my_id;
  13
  14 static void match_no_le16_param(const char *fn, struct expression *expr, void *param)
  15 {
  16         struct expression *arg;
  17         char *macro_name;
  18         char *name;
  19
  20         arg = get_argument_from_call_expr(expr->args, (int)param);
  21         if (!arg)
  22                 return;
  23         macro_name = get_macro_name(&arg->pos);
  24         if (!macro_name || strcmp(macro_name, "cpu_to_le16"))
  25                 return;
  26
  27         arg = strip_expr(arg);
  28         name = get_variable_from_expr_complex(arg, NULL);
  29         sm_msg("warn: don't need to call cpu_to_le16() for '%s'", name);
  30         free_string(name);
  31 }
  32
  33 static void register_funcs_from_file(void)
  34 {
  35         struct token *token;
  36         const char *func;
  37         int arg;
  38
  39         token = get_tokens_file("kernel.no_le16");
  40         if (!token)
  41                 return;
  42         if (token_type(token) != TOKEN_STREAMBEGIN)
  43                 return;
  44         token = token->next;
  45         while (token_type(token) != TOKEN_STREAMEND) {
  46                 if (token_type(token) != TOKEN_IDENT)
  47                         return;
  48                 func = show_ident(token->ident);
  49                 token = token->next;
  50                 if (token_type(token) != TOKEN_NUMBER)
  51                         return;
  52                 arg = atoi(token->number);
  53                 add_function_hook(func, &match_no_le16_param, INT_PTR(arg));
  54                 token = token->next;
  55         }
  56         clear_token_alloc();
  57 }
  58
  59 void check_le16(int id)
  60 {
  61         if (option_project != PROJ_KERNEL)
  62                 return;
  63         my_id = id;
  64         register_funcs_from_file();
  65 }