/*
- * Project: libFIRM
- * File name: ir/ana/irloop_t.h
- * Purpose: Loop datastructure and access functions.
- * Author: Goetz Lindenmaier
- * Modified by:
- * Created: 7.2002
- * CVS-ID: $Id$
- * Copyright: (c) 2002-2003 Universität Karlsruhe
- * Licence: This file protected by GPL - GNU GENERAL PUBLIC LICENSE.
+ * Copyright (C) 1995-2007 University of Karlsruhe. All right reserved.
+ *
+ * This file is part of libFirm.
+ *
+ * This file may be distributed and/or modified under the terms of the
+ * GNU General Public License version 2 as published by the Free Software
+ * Foundation and appearing in the file LICENSE.GPL included in the
+ * packaging of this file.
+ *
+ * Licensees holding valid libFirm Professional Edition licenses may use
+ * this file in accordance with the libFirm Commercial License.
+ * Agreement provided with the Software.
+ *
+ * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
+ * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE.
*/
/**
-* @file irloop.h
-*
-* Computes backedges in the control and data flow.
-*
-* @author Goetz Lindenmaier
-*
-* Only Block and Phi/Filter nodes can have incoming backedges.
-* Constructs loops data structure: indicates loop nesting.
-*/
-
-# ifndef _IRLOOP_H_
-# define _IRLOOP_H_
+ * @file
+ * @brief Loop datastructure and access functions.
+ * @author Goetz Lindenmaier
+ * @date 7.2002
+ * @version $Id$
+ * @summary
+ * Computes backedges in the control and data flow.
+ *
+ * @note
+ * Only Block and Phi/Filter nodes can have incoming backedges.
+ * Constructs loops data structure: indicates loop nesting.
+ */
+# ifndef FIRM_ANA_IRLOOP_H
+# define FIRM_ANA_IRLOOP_H
# include "irgraph.h"
# include "irnode.h"
*/
/* ------------------------------------------------------------------- */
-/** Returns true if the predesessor pos is a backedge. */
+/** Returns true if the predecessor pos is a backedge in the interprozeduralem view. */
int is_inter_backedge(ir_node *n, int pos);
+/** Returns true if the predecessor pos is a backedge in the intraprocedural view. */
int is_intra_backedge(ir_node *n, int pos);
/** Returns non-zero if the predecessor pos is a backedge. */
int is_backedge (ir_node *n, int pos);
-/** Remarks that edge pos is a backedge. */
+/** Marks edge pos as a backedge. */
void set_backedge (ir_node *n, int pos);
-/** Remarks that edge pos is not a backedge. */
+/** Marks edge pos as a non-backedge. */
void set_not_backedge (ir_node *n, int pos);
/** Returns non-zero if n has backedges. */
int has_backedges (ir_node *n);
-/** Sets backedge information to zero. */
+/** Clears all backedge information. */
void clear_backedges (ir_node *n);
/* ------------------------------------------------------------------- */
/**
- * The loops datastructure.
+ * The loops data structure.
*
- * The loops datastructure represents circles in the intermediate
+ * The loops data structure represents circles in the intermediate
* representation. It does not represent loops in the terms of a
* source program.
- * Each ir_graph can contain one outermost loop datastructure.
+ * Each ir_graph can contain one outermost loop data structure.
* loop is the entry point to the nested loops.
- * The loop datastructure contains a field indicating the depth of
+ * The loop data structure contains a field indicating the depth of
* the loop within the nesting. Further it contains a list of the
* loops with nesting depth -1. Finally it contains a list of all
* nodes in the loop.
ir_loop *get_irg_loop(ir_graph *irg);
/** Returns the loop n is contained in. NULL if node is in no loop. */
-ir_loop *get_irn_loop(ir_node *n);
+ir_loop *get_irn_loop(const ir_node *n);
/** Returns outer loop, itself if outermost. */
-ir_loop *get_loop_outer_loop (ir_loop *loop);
+ir_loop *get_loop_outer_loop (const ir_loop *loop);
/** Returns nesting depth of this loop */
-int get_loop_depth (ir_loop *loop);
+int get_loop_depth (const ir_loop *loop);
/* Sons are the inner loops contained in this loop. */
/** Returns the number of inner loops */
-int get_loop_n_sons (ir_loop *loop);
+int get_loop_n_sons (const ir_loop *loop);
/** Returns the pos`th son loop (inner loop) of a loop.
Returns NULL if there is not a pos`th loop_node. */
ir_node *get_loop_node (ir_loop *loop, int pos);
/** Returns the number of elements contained in loop. */
-int get_loop_n_elements (ir_loop *loop);
+int get_loop_n_elements (const ir_loop *loop);
+
/** Returns a loop element. A loop element can be interpreted as a
kind pointer, an ir_node* or an ir_loop*. */
-loop_element get_loop_element (ir_loop *loop, int pos);
+loop_element get_loop_element (const ir_loop *loop, int pos);
/** Returns the element number of the loop son in loop.
* Returns -1 if not found. O(|elements|). */
-int get_loop_element_pos(ir_loop *loop, void *le);
+int get_loop_element_pos(const ir_loop *loop, void *le);
/** Returns a unique node number for the loop node to make output
readable. If libfirm_debug is not set it returns the loop cast to
int. */
-int get_loop_loop_nr(ir_loop *loop);
+int get_loop_loop_nr(const ir_loop *loop);
/** A field to connect additional information to a loop. Only valid
if libfirm_debug is set, else returns NULL. */
* The resulting loop tree is a possible visiting order for dataflow
* analysis.
*
+ * This algorithm destoyes the link field of block nodes.
+ *
* @returns Maximal depth of loop tree.
*
* @remark
* This algorithm computes only back edge information for Block nodes, not
* for Phi nodes.
*
- * @returns Maximal depth of loop tree. */
+ * This algorithm destoyes the link field of block nodes.
+ *
+ * @returns Maximal depth of loop tree.
+ */
int construct_cf_backedges(ir_graph *irg);
/** Construct interprocedural loop tree for control flow.
* belongs to or in inner loops of this block. */
int is_loop_invariant(ir_node *n, ir_node *block);
-
-#endif /* _IRLOOP_H_ */
+#endif
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