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jeremybenn |
/* Iterator routines for manipulating GENERIC tree statement list.
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Copyright (C) 2003, 2004, 2007, 2010 Free Software Foundation, Inc.
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Contributed by Andrew MacLeod <amacleod@redhat.com>
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GCC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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/* This file is dependent upon the implementation of tree's. It provides an
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abstract interface to the tree objects such that if all tree creation and
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manipulations are done through this interface, we can easily change the
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implementation of tree's, and not impact other code. */
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#ifndef GCC_TREE_ITERATOR_H
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#define GCC_TREE_ITERATOR_H 1
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/* Iterator object for GENERIC or GIMPLE TREE statements. */
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typedef struct {
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struct tree_statement_list_node *ptr;
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tree container;
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} tree_stmt_iterator;
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static inline tree_stmt_iterator
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tsi_start (tree t)
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{
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tree_stmt_iterator i;
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i.ptr = STATEMENT_LIST_HEAD (t);
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i.container = t;
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return i;
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}
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static inline tree_stmt_iterator
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tsi_last (tree t)
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{
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tree_stmt_iterator i;
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i.ptr = STATEMENT_LIST_TAIL (t);
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i.container = t;
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return i;
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}
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static inline bool
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tsi_end_p (tree_stmt_iterator i)
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{
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return i.ptr == NULL;
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}
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static inline bool
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tsi_one_before_end_p (tree_stmt_iterator i)
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{
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return i.ptr != NULL && i.ptr->next == NULL;
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}
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static inline void
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tsi_next (tree_stmt_iterator *i)
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{
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i->ptr = i->ptr->next;
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}
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static inline void
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tsi_prev (tree_stmt_iterator *i)
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{
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i->ptr = i->ptr->prev;
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}
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static inline tree *
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tsi_stmt_ptr (tree_stmt_iterator i)
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{
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return &i.ptr->stmt;
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}
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static inline tree
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tsi_stmt (tree_stmt_iterator i)
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{
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return i.ptr->stmt;
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}
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enum tsi_iterator_update
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{
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TSI_NEW_STMT, /* Only valid when single statement is added, move
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iterator to it. */
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TSI_SAME_STMT, /* Leave the iterator at the same statement. */
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TSI_CHAIN_START, /* Only valid when chain of statements is added, move
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iterator to the first statement in the chain. */
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TSI_CHAIN_END, /* Only valid when chain of statements is added, move
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iterator to the last statement in the chain. */
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TSI_CONTINUE_LINKING /* Move iterator to whatever position is suitable for
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linking other statements/chains of statements in
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the same direction. */
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};
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extern void tsi_link_before (tree_stmt_iterator *, tree,
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enum tsi_iterator_update);
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extern void tsi_link_after (tree_stmt_iterator *, tree,
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enum tsi_iterator_update);
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extern void tsi_delink (tree_stmt_iterator *);
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extern tree alloc_stmt_list (void);
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extern void free_stmt_list (tree);
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extern void append_to_statement_list (tree, tree *);
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extern void append_to_statement_list_force (tree, tree *);
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#endif /* GCC_TREE_ITERATOR_H */
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