check_kernel.c

   1 /*
   2  * sparse/check_kernel.c
   3  *
   4  * Copyright (C) 2010 Dan Carpenter.
   5  *
   6  * Licensed under the Open Software License version 1.1
   7  *
   8  */
   9
  10 /*
  11  * This is kernel specific stuff for smatch_extra.
  12  */
  13
  14 #include "smatch.h"
  15 #include "smatch_extra.h"
  16
  17 static void match_param_nonnull(const char *fn, struct expression *call_expr,
  18                         struct expression *assign_expr, void *_param)
  19 {
  20         int param = PTR_INT(_param);
  21         struct expression *arg;
  22         struct smatch_state *pre_state;
  23         struct smatch_state *true_state;
  24
  25         arg = get_argument_from_call_expr(call_expr->args, param);
  26         pre_state = get_state_expr(SMATCH_EXTRA, arg);
  27         true_state = add_filter(pre_state, 0);
  28         set_extra_expr_nomod(arg, true_state);
  29 }
  30
  31 static void match_container_of(const char *fn, struct expression *expr, void *unused)
  32 {
  33         set_extra_expr_mod(expr->left, alloc_extra_state_range(1, POINTER_MAX));
  34 }
  35
  36 void check_kernel(int id)
  37 {
  38         if (option_project != PROJ_KERNEL)
  39                 return;
  40
  41         return_implies_state("IS_ERR_OR_NULL", 0, 0, &match_param_nonnull, (void *)0);
  42         return_implies_state("tomoyo_memory_ok", 1, 1, &match_param_nonnull, (void *)0);
  43         add_macro_assign_hook("container_of", &match_container_of, NULL);
  44 }