smatch_function_ptrs.c

   1 /*
   2  * smatch/smatch_function_ptrs.c
   3  *
   4  * Copyright (C) 2013 Oracle.
   5  *
   6  * Licensed under the Open Software License version 1.1
   7  *
   8  */
   9
  10 /*
  11  * Track how functions are saved as various struct members or passed as
  12  * parameters.
  13  *
  14  */
  15
  16 #include "smatch.h"
  17 #include "smatch_slist.h"
  18
  19 static int my_id;
  20
  21 static void match_function_assign(struct expression *expr)
  22 {
  23         struct expression *right = expr->right;
  24         struct symbol *sym;
  25         char *fn_name;
  26         char *ptr_name;
  27
  28         if (right->type == EXPR_PREOP && right->op == '&')
  29                 right = strip_expr(right->unop);
  30         if (right->type != EXPR_SYMBOL)
  31                 return;
  32         sym = get_type(right);
  33         if (!sym || sym->type != SYM_FN)
  34                 return;
  35
  36         fn_name = expr_to_var(right);
  37         ptr_name = get_fnptr_name(expr->left);
  38         if (!fn_name || !ptr_name)
  39                 goto free;
  40
  41         sql_insert_function_ptr(fn_name, ptr_name);
  42
  43 free:
  44         free_string(fn_name);
  45         free_string(ptr_name);
  46 }
  47
  48 void register_function_ptrs(int id)
  49 {
  50         my_id = id;
  51
  52         if (!option_info)
  53                 return;
  54
  55         add_hook(&match_function_assign, ASSIGNMENT_HOOK);
  56 }