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author kent <kent@cr.ie.u-ryukyu.ac.jp>
date Fri, 17 Jul 2009 14:47:48 +0900
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1 /* Hooks for cfg representation specific functions.
2 Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008
3 Free Software Foundation, Inc.
4 Contributed by Sebastian Pop <s.pop@laposte.net>
5
6 This file is part of GCC.
7
8 GCC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3, or (at your option)
11 any later version.
12
13 GCC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
21
22 #ifndef GCC_CFGHOOKS_H
23 #define GCC_CFGHOOKS_H
24
25 struct cfg_hooks
26 {
27 /* Name of the corresponding ir. */
28 const char *name;
29
30 /* Debugging. */
31 int (*verify_flow_info) (void);
32 void (*dump_bb) (basic_block, FILE *, int, int);
33
34 /* Basic CFG manipulation. */
35
36 /* Return new basic block. */
37 basic_block (*create_basic_block) (void *head, void *end, basic_block after);
38
39 /* Redirect edge E to the given basic block B and update underlying program
40 representation. Returns edge representing redirected branch (that may not
41 be equivalent to E in the case of duplicate edges being removed) or NULL
42 if edge is not easily redirectable for whatever reason. */
43 edge (*redirect_edge_and_branch) (edge e, basic_block b);
44
45 /* Same as the above but allows redirecting of fallthru edges. In that case
46 newly created forwarder basic block is returned. The edge must
47 not be abnormal. */
48 basic_block (*redirect_edge_and_branch_force) (edge, basic_block);
49
50 /* Returns true if it is possible to remove the edge by redirecting it
51 to the destination of the other edge going from its source. */
52 bool (*can_remove_branch_p) (const_edge);
53
54 /* Remove statements corresponding to a given basic block. */
55 void (*delete_basic_block) (basic_block);
56
57 /* Creates a new basic block just after basic block B by splitting
58 everything after specified instruction I. */
59 basic_block (*split_block) (basic_block b, void * i);
60
61 /* Move block B immediately after block A. */
62 bool (*move_block_after) (basic_block b, basic_block a);
63
64 /* Return true when blocks A and B can be merged into single basic block. */
65 bool (*can_merge_blocks_p) (basic_block a, basic_block b);
66
67 /* Merge blocks A and B. */
68 void (*merge_blocks) (basic_block a, basic_block b);
69
70 /* Predict edge E using PREDICTOR to given PROBABILITY. */
71 void (*predict_edge) (edge e, enum br_predictor predictor, int probability);
72
73 /* Return true if the one of outgoing edges is already predicted by
74 PREDICTOR. */
75 bool (*predicted_by_p) (const_basic_block bb, enum br_predictor predictor);
76
77 /* Return true when block A can be duplicated. */
78 bool (*can_duplicate_block_p) (const_basic_block a);
79
80 /* Duplicate block A. */
81 basic_block (*duplicate_block) (basic_block a);
82
83 /* Higher level functions representable by primitive operations above if
84 we didn't have some oddities in RTL and Tree representations. */
85 basic_block (*split_edge) (edge);
86 void (*make_forwarder_block) (edge);
87
88 /* Tries to make the edge fallthru. */
89 void (*tidy_fallthru_edge) (edge);
90
91 /* Say whether a block ends with a call, possibly followed by some
92 other code that must stay with the call. */
93 bool (*block_ends_with_call_p) (basic_block);
94
95 /* Say whether a block ends with a conditional branch. Switches
96 and unconditional branches do not qualify. */
97 bool (*block_ends_with_condjump_p) (const_basic_block);
98
99 /* Add fake edges to the function exit for any non constant and non noreturn
100 calls, volatile inline assembly in the bitmap of blocks specified by
101 BLOCKS or to the whole CFG if BLOCKS is zero. Return the number of blocks
102 that were split.
103
104 The goal is to expose cases in which entering a basic block does not imply
105 that all subsequent instructions must be executed. */
106 int (*flow_call_edges_add) (sbitmap);
107
108 /* This function is called immediately after edge E is added to the
109 edge vector E->dest->preds. */
110 void (*execute_on_growing_pred) (edge);
111
112 /* This function is called immediately before edge E is removed from
113 the edge vector E->dest->preds. */
114 void (*execute_on_shrinking_pred) (edge);
115
116 /* A hook for duplicating loop in CFG, currently this is used
117 in loop versioning. */
118 bool (*cfg_hook_duplicate_loop_to_header_edge) (struct loop *, edge,
119 unsigned, sbitmap,
120 edge, VEC (edge, heap) **,
121 int);
122
123 /* Add condition to new basic block and update CFG used in loop
124 versioning. */
125 void (*lv_add_condition_to_bb) (basic_block, basic_block, basic_block,
126 void *);
127 /* Update the PHI nodes in case of loop versioning. */
128 void (*lv_adjust_loop_header_phi) (basic_block, basic_block,
129 basic_block, edge);
130
131 /* Given a condition BB extract the true/false taken/not taken edges
132 (depending if we are on tree's or RTL). */
133 void (*extract_cond_bb_edges) (basic_block, edge *, edge *);
134
135
136 /* Add PHI arguments queued in PENDINT_STMT list on edge E to edge
137 E->dest (only in tree-ssa loop versioning. */
138 void (*flush_pending_stmts) (edge);
139 };
140
141 extern void verify_flow_info (void);
142 extern void dump_bb (basic_block, FILE *, int);
143 extern edge redirect_edge_and_branch (edge, basic_block);
144 extern basic_block redirect_edge_and_branch_force (edge, basic_block);
145 extern bool can_remove_branch_p (const_edge);
146 extern void remove_branch (edge);
147 extern void remove_edge (edge);
148 extern edge split_block (basic_block, void *);
149 extern edge split_block_after_labels (basic_block);
150 extern bool move_block_after (basic_block, basic_block);
151 extern void delete_basic_block (basic_block);
152 extern basic_block split_edge (edge);
153 extern basic_block create_basic_block (void *, void *, basic_block);
154 extern basic_block create_empty_bb (basic_block);
155 extern bool can_merge_blocks_p (basic_block, basic_block);
156 extern void merge_blocks (basic_block, basic_block);
157 extern edge make_forwarder_block (basic_block, bool (*)(edge),
158 void (*) (basic_block));
159 extern void tidy_fallthru_edge (edge);
160 extern void tidy_fallthru_edges (void);
161 extern void predict_edge (edge e, enum br_predictor predictor, int probability);
162 extern bool predicted_by_p (const_basic_block bb, enum br_predictor predictor);
163 extern bool can_duplicate_block_p (const_basic_block);
164 extern basic_block duplicate_block (basic_block, edge, basic_block);
165 extern bool block_ends_with_call_p (basic_block bb);
166 extern bool block_ends_with_condjump_p (const_basic_block bb);
167 extern int flow_call_edges_add (sbitmap);
168 extern void execute_on_growing_pred (edge);
169 extern void execute_on_shrinking_pred (edge);
170 extern bool cfg_hook_duplicate_loop_to_header_edge (struct loop *loop, edge,
171 unsigned int ndupl,
172 sbitmap wont_exit,
173 edge orig,
174 VEC (edge, heap) **to_remove,
175 int flags);
176
177 extern void lv_flush_pending_stmts (edge);
178 extern void extract_cond_bb_edges (basic_block, edge *, edge*);
179 extern void lv_adjust_loop_header_phi (basic_block, basic_block, basic_block,
180 edge);
181 extern void lv_add_condition_to_bb (basic_block, basic_block, basic_block,
182 void *);
183
184 /* Hooks containers. */
185 extern struct cfg_hooks gimple_cfg_hooks;
186 extern struct cfg_hooks rtl_cfg_hooks;
187 extern struct cfg_hooks cfg_layout_rtl_cfg_hooks;
188
189 /* Declarations. */
190 extern enum ir_type current_ir_type (void);
191 extern void rtl_register_cfg_hooks (void);
192 extern void cfg_layout_rtl_register_cfg_hooks (void);
193 extern void gimple_register_cfg_hooks (void);
194 extern struct cfg_hooks get_cfg_hooks (void);
195 extern void set_cfg_hooks (struct cfg_hooks);
196
197 #endif /* GCC_CFGHOOKS_H */