2 * Copyright (C) 1995-2008 University of Karlsruhe. All right reserved.
4 * This file is part of libFirm.
6 * This file may be distributed and/or modified under the terms of the
7 * GNU General Public License version 2 as published by the Free Software
8 * Foundation and appearing in the file LICENSE.GPL included in the
9 * packaging of this file.
11 * Licensees holding valid libFirm Professional Edition licenses may use
12 * this file in accordance with the libFirm Commercial License.
13 * Agreement provided with the Software.
15 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
16 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * @brief Compute heights of nodes inside basic blocks
23 * @author Sebastian Hack
27 #ifndef FIRM_ANA_HEIGHTS_H
28 #define FIRM_ANA_HEIGHTS_H
30 #include "firm_types.h"
33 typedef struct _heights_t heights_t;
36 * Get the height of a node inside a basic block.
37 * The height of the node is the maximal number of edges between a sink node in that block and the node itself (plus 1).
38 * @param h The heights object.
39 * @param irn The node.
40 * @return The height of the node.
42 FIRM_API unsigned get_irn_height(heights_t *h, const ir_node *irn);
45 * Check, if a certain node is reachable according to data dependence edges from another node.
46 * @param h The heights object.
47 * @param n The first node.
48 * @param m The other node.
49 * @return 1, if n is data dependent on m, 0 if not.
51 FIRM_API int heights_reachable_in_block(heights_t *h, const ir_node *n,
55 * Recompute the height information.
56 * This can be used to recompute the height information if the graph has changed since the last computation.
57 * @param h The heights object.
59 FIRM_API void heights_recompute(heights_t *h);
62 * Recompute the height information for a certain block.
63 * This can be used to recompute the height information of a block.
64 * @param h The heights object.
65 * @param block The block
66 * @return The maximum over all heights in the block.
68 FIRM_API unsigned heights_recompute_block(heights_t *h, ir_node *block);
71 * Make a new heights object.
72 * This also computes the heights for each block in the graph.
73 * @param irg The graph.
75 FIRM_API heights_t *heights_new(ir_graph *irg);
78 * Free a heights object.
79 * @param h The heights object.
81 FIRM_API void heights_free(heights_t *h);