smatch_var_sym.c

   1 /*
   2  * Copyright (C) 2013 Oracle.
   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
  20 ALLOCATOR(var_sym, "var_sym structs");
  21
  22 struct var_sym *alloc_var_sym(const char *var, struct symbol *sym)
  23 {
  24         struct var_sym *tmp;
  25
  26         tmp = __alloc_var_sym(0);
  27         tmp->var = alloc_string(var);
  28         tmp->sym = sym;
  29         return tmp;
  30 }
  31
  32 struct var_sym_list *expr_to_vsl(struct expression *expr)
  33 {
  34         struct var_sym_list *ret = NULL;
  35         char *var;
  36         struct symbol *sym;
  37
  38         expr = strip_expr(expr);
  39         if (!expr)
  40                 return NULL;
  41
  42         if (expr->type == EXPR_PREOP && expr->op == '*')
  43                 return expr_to_vsl(expr->unop);
  44
  45         if (expr->type == EXPR_BINOP ||
  46             expr->type == EXPR_LOGICAL ||
  47             expr->type == EXPR_COMPARE) {
  48                 struct var_sym_list *left, *right;
  49
  50                 left = expr_to_vsl(expr->left);
  51                 right = expr_to_vsl(expr->right);
  52                 ret = combine_var_sym_lists(left, right);
  53                 free_var_syms_and_list(&left);
  54                 free_var_syms_and_list(&right);
  55                 return ret;
  56         }
  57         var = expr_to_var_sym(expr, &sym);
  58         if (!var || !sym) {
  59                 free_string(var);
  60                 return NULL;
  61         }
  62         add_var_sym(&ret, var, sym);
  63         return ret;
  64 }
  65
  66 void add_var_sym(struct var_sym_list **list, const char *var, struct symbol *sym)
  67 {
  68         struct var_sym *tmp;
  69
  70         if (in_var_sym_list(*list, var, sym))
  71                 return;
  72         tmp = alloc_var_sym(var, sym);
  73         add_ptr_list(list, tmp);
  74 }
  75
  76 void add_var_sym_expr(struct var_sym_list **list, struct expression *expr)
  77 {
  78         char *var;
  79         struct symbol *sym;
  80
  81         var = expr_to_var_sym(expr, &sym);
  82         if (!var || !sym)
  83                 goto free;
  84         add_var_sym(list, var, sym);
  85 free:
  86         free_string(var);
  87 }
  88
  89 static void free_var_sym(struct var_sym *vs)
  90 {
  91         free_string(vs->var);
  92         __free_var_sym(vs);
  93 }
  94
  95 void del_var_sym(struct var_sym_list **list, const char *var, struct symbol *sym)
  96 {
  97         struct var_sym *tmp;
  98
  99         FOR_EACH_PTR(*list, tmp) {
 100                 if (tmp->sym == sym && strcmp(tmp->var, var) == 0) {
 101                         DELETE_CURRENT_PTR(tmp);
 102                         free_var_sym(tmp);
 103                         return;
 104                 }
 105         } END_FOR_EACH_PTR(tmp);
 106 }
 107
 108 int in_var_sym_list(struct var_sym_list *list, const char *var, struct symbol *sym)
 109 {
 110         struct var_sym *tmp;
 111
 112         FOR_EACH_PTR(list, tmp) {
 113                 if (tmp->sym == sym && strcmp(tmp->var, var) == 0)
 114                         return 1;
 115         } END_FOR_EACH_PTR(tmp);
 116         return 0;
 117 }
 118
 119 struct var_sym_list *clone_var_sym_list(struct var_sym_list *from_vsl)
 120 {
 121         struct var_sym *tmp, *clone_vs;
 122         struct var_sym_list *to_vsl = NULL;
 123
 124         FOR_EACH_PTR(from_vsl, tmp) {
 125                 clone_vs = alloc_var_sym(tmp->var, tmp->sym);
 126                 add_ptr_list(&to_vsl, clone_vs);
 127         } END_FOR_EACH_PTR(tmp);
 128         return to_vsl;
 129 }
 130
 131 void merge_var_sym_list(struct var_sym_list **dest, struct var_sym_list *src)
 132 {
 133         struct var_sym *tmp;
 134
 135         FOR_EACH_PTR(src, tmp) {
 136                 add_var_sym(dest, tmp->var, tmp->sym);
 137         } END_FOR_EACH_PTR(tmp);
 138 }
 139
 140 struct var_sym_list *combine_var_sym_lists(struct var_sym_list *one, struct var_sym_list *two)
 141 {
 142         struct var_sym_list *to_vsl;
 143
 144         to_vsl = clone_var_sym_list(one);
 145         merge_var_sym_list(&to_vsl, two);
 146         return to_vsl;
 147 }
 148
 149 void free_var_sym_list(struct var_sym_list **list)
 150 {
 151         __free_ptr_list((struct ptr_list **)list);
 152 }
 153
 154 void free_var_syms_and_list(struct var_sym_list **list)
 155 {
 156         struct var_sym *tmp;
 157
 158         FOR_EACH_PTR(*list, tmp) {
 159                 free_var_sym(tmp);
 160         } END_FOR_EACH_PTR(tmp);
 161         free_var_sym_list(list);
 162 }
 163