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      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 }
     42