isl_ast_node_set_field_templ.c

   1 /*
   2  * Copyright 2012      Ecole Normale Superieure
   3  *
   4  * Use of this software is governed by the MIT license
   5  *
   6  * Written by Sven Verdoolaege,
   7  * Ecole Normale Superieure, 45 rue d'Ulm, 75230 Paris, France
   8  */
   9
  10 #define xFN(TYPE,NAME) TYPE ## _ ## NAME
  11 #define FN(TYPE,NAME) xFN(TYPE,NAME)
  12
  13 /* Replace the field FIELD of "node" by "field",
  14  * where the field may or may not have already been set in "node".
  15  * However, if the field has not already been set,
  16  * then "node" is required to have a single reference.
  17  * In this case the call to isl_ast_node_cow has no effect.
  18  */
  19 __isl_give isl_ast_node *FN(FN(FN(isl_ast_node,NODE_TYPE),set),FIELD_NAME)(
  20         __isl_take isl_ast_node *node, __isl_take FIELD_TYPE *field)
  21 {
  22         if (FN(isl_ast_node_check,NODE_TYPE)(node) < 0 || !field)
  23                 goto error;
  24         if (node->FIELD == field) {
  25                 FN(FIELD_TYPE,free)(field);
  26                 return node;
  27         }
  28
  29         node = isl_ast_node_cow(node);
  30         if (!node)
  31                 goto error;
  32
  33         FN(FIELD_TYPE,free)(node->FIELD);
  34         node->FIELD = field;
  35
  36         return node;
  37 error:
  38         isl_ast_node_free(node);
  39         FN(FIELD_TYPE,free)(field);
  40         return NULL;
  41 }