check_struct_type.c

   1 /*
   2  * sparse/check_struct_type.c
   3  *
   4  * Copyright (C) 2013 Oracle.
   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_assign(const char *fn, struct expression *expr, void *_size_arg)
  15 {
  16         int size_arg = PTR_INT(_size_arg);
  17         struct expression *left;
  18         struct expression *call;
  19         struct expression *arg;
  20         struct symbol *left_type;
  21         struct symbol *size_type;
  22
  23         left = strip_expr(expr->left);
  24         left_type = get_type(left);
  25         if (!left_type || left_type->type != SYM_PTR)
  26                 return;
  27         left_type = get_real_base_type(left_type);
  28         if (!left_type || left_type->type != SYM_STRUCT)
  29                 return;
  30
  31         call = strip_expr(expr->right);
  32         arg = get_argument_from_call_expr(call->args, size_arg);
  33         if (!arg || arg->type != EXPR_SIZEOF || !arg->cast_type)
  34                 return;
  35         size_type = arg->cast_type;
  36         if (size_type->type != SYM_NODE)
  37                 return;
  38         size_type = get_real_base_type(size_type);
  39         if (size_type->type != SYM_STRUCT)
  40                 return;
  41         if (strcmp(left_type->ident->name, size_type->ident->name) == 0)
  42                 return;
  43         sm_msg("warn: struct type mismatch '%s vs %s'", left_type->ident->name,
  44                size_type->ident->name);
  45
  46 }
  47
  48 void check_struct_type(int id)
  49 {
  50         my_id = id;
  51
  52         if (option_project == PROJ_KERNEL) {
  53                 add_function_assign_hook("kmalloc", &match_assign, INT_PTR(0));
  54                 add_function_assign_hook("kzalloc", &match_assign, INT_PTR(0));
  55         }
  56 }