Mercurial > hg > CbC > CbC_gcc
annotate gcc/basic-block.h @ 55:77e2b8dfacca gcc-4.4.5
update it from 4.4.3 to 4.5.0
author | ryoma <e075725@ie.u-ryukyu.ac.jp> |
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date | Fri, 12 Feb 2010 23:39:51 +0900 |
parents | a06113de4d67 |
children | b7f97abdc517 |
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0 | 1 /* Define control and data flow tables, and regsets. |
2 Copyright (C) 1987, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, | |
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3 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc. |
0 | 4 |
5 This file is part of GCC. | |
6 | |
7 GCC is free software; you can redistribute it and/or modify it under | |
8 the terms of the GNU General Public License as published by the Free | |
9 Software Foundation; either version 3, or (at your option) any later | |
10 version. | |
11 | |
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 for more details. | |
16 | |
17 You should have received a copy of the GNU General Public License | |
18 along with GCC; see the file COPYING3. If not see | |
19 <http://www.gnu.org/licenses/>. */ | |
20 | |
21 #ifndef GCC_BASIC_BLOCK_H | |
22 #define GCC_BASIC_BLOCK_H | |
23 | |
24 #include "bitmap.h" | |
25 #include "sbitmap.h" | |
26 #include "varray.h" | |
27 #include "partition.h" | |
28 #include "hard-reg-set.h" | |
29 #include "predict.h" | |
30 #include "vec.h" | |
31 #include "function.h" | |
32 | |
33 /* Head of register set linked list. */ | |
34 typedef bitmap_head regset_head; | |
35 | |
36 /* A pointer to a regset_head. */ | |
37 typedef bitmap regset; | |
38 | |
39 /* Allocate a register set with oballoc. */ | |
40 #define ALLOC_REG_SET(OBSTACK) BITMAP_ALLOC (OBSTACK) | |
41 | |
42 /* Do any cleanup needed on a regset when it is no longer used. */ | |
43 #define FREE_REG_SET(REGSET) BITMAP_FREE (REGSET) | |
44 | |
45 /* Initialize a new regset. */ | |
46 #define INIT_REG_SET(HEAD) bitmap_initialize (HEAD, ®_obstack) | |
47 | |
48 /* Clear a register set by freeing up the linked list. */ | |
49 #define CLEAR_REG_SET(HEAD) bitmap_clear (HEAD) | |
50 | |
51 /* Copy a register set to another register set. */ | |
52 #define COPY_REG_SET(TO, FROM) bitmap_copy (TO, FROM) | |
53 | |
54 /* Compare two register sets. */ | |
55 #define REG_SET_EQUAL_P(A, B) bitmap_equal_p (A, B) | |
56 | |
57 /* `and' a register set with a second register set. */ | |
58 #define AND_REG_SET(TO, FROM) bitmap_and_into (TO, FROM) | |
59 | |
60 /* `and' the complement of a register set with a register set. */ | |
61 #define AND_COMPL_REG_SET(TO, FROM) bitmap_and_compl_into (TO, FROM) | |
62 | |
63 /* Inclusive or a register set with a second register set. */ | |
64 #define IOR_REG_SET(TO, FROM) bitmap_ior_into (TO, FROM) | |
65 | |
66 /* Exclusive or a register set with a second register set. */ | |
67 #define XOR_REG_SET(TO, FROM) bitmap_xor_into (TO, FROM) | |
68 | |
69 /* Or into TO the register set FROM1 `and'ed with the complement of FROM2. */ | |
70 #define IOR_AND_COMPL_REG_SET(TO, FROM1, FROM2) \ | |
71 bitmap_ior_and_compl_into (TO, FROM1, FROM2) | |
72 | |
73 /* Clear a single register in a register set. */ | |
74 #define CLEAR_REGNO_REG_SET(HEAD, REG) bitmap_clear_bit (HEAD, REG) | |
75 | |
76 /* Set a single register in a register set. */ | |
77 #define SET_REGNO_REG_SET(HEAD, REG) bitmap_set_bit (HEAD, REG) | |
78 | |
79 /* Return true if a register is set in a register set. */ | |
80 #define REGNO_REG_SET_P(TO, REG) bitmap_bit_p (TO, REG) | |
81 | |
82 /* Copy the hard registers in a register set to the hard register set. */ | |
83 extern void reg_set_to_hard_reg_set (HARD_REG_SET *, const_bitmap); | |
84 #define REG_SET_TO_HARD_REG_SET(TO, FROM) \ | |
85 do { \ | |
86 CLEAR_HARD_REG_SET (TO); \ | |
87 reg_set_to_hard_reg_set (&TO, FROM); \ | |
88 } while (0) | |
89 | |
90 typedef bitmap_iterator reg_set_iterator; | |
91 | |
92 /* Loop over all registers in REGSET, starting with MIN, setting REGNUM to the | |
93 register number and executing CODE for all registers that are set. */ | |
94 #define EXECUTE_IF_SET_IN_REG_SET(REGSET, MIN, REGNUM, RSI) \ | |
95 EXECUTE_IF_SET_IN_BITMAP (REGSET, MIN, REGNUM, RSI) | |
96 | |
97 /* Loop over all registers in REGSET1 and REGSET2, starting with MIN, setting | |
98 REGNUM to the register number and executing CODE for all registers that are | |
99 set in the first regset and not set in the second. */ | |
100 #define EXECUTE_IF_AND_COMPL_IN_REG_SET(REGSET1, REGSET2, MIN, REGNUM, RSI) \ | |
101 EXECUTE_IF_AND_COMPL_IN_BITMAP (REGSET1, REGSET2, MIN, REGNUM, RSI) | |
102 | |
103 /* Loop over all registers in REGSET1 and REGSET2, starting with MIN, setting | |
104 REGNUM to the register number and executing CODE for all registers that are | |
105 set in both regsets. */ | |
106 #define EXECUTE_IF_AND_IN_REG_SET(REGSET1, REGSET2, MIN, REGNUM, RSI) \ | |
107 EXECUTE_IF_AND_IN_BITMAP (REGSET1, REGSET2, MIN, REGNUM, RSI) \ | |
108 | |
109 /* Same information as REGS_INVALIDATED_BY_CALL but in regset form to be used | |
110 in dataflow more conveniently. */ | |
111 | |
112 extern regset regs_invalidated_by_call_regset; | |
113 | |
114 /* Type we use to hold basic block counters. Should be at least | |
115 64bit. Although a counter cannot be negative, we use a signed | |
116 type, because erroneous negative counts can be generated when the | |
117 flow graph is manipulated by various optimizations. A signed type | |
118 makes those easy to detect. */ | |
119 typedef HOST_WIDEST_INT gcov_type; | |
120 | |
121 /* Control flow edge information. */ | |
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122 struct GTY(()) edge_def { |
0 | 123 /* The two blocks at the ends of the edge. */ |
124 struct basic_block_def *src; | |
125 struct basic_block_def *dest; | |
126 | |
127 /* Instructions queued on the edge. */ | |
128 union edge_def_insns { | |
129 gimple_seq GTY ((tag ("true"))) g; | |
130 rtx GTY ((tag ("false"))) r; | |
131 } GTY ((desc ("current_ir_type () == IR_GIMPLE"))) insns; | |
132 | |
133 /* Auxiliary info specific to a pass. */ | |
134 PTR GTY ((skip (""))) aux; | |
135 | |
136 /* Location of any goto implicit in the edge and associated BLOCK. */ | |
137 tree goto_block; | |
138 location_t goto_locus; | |
139 | |
140 /* The index number corresponding to this edge in the edge vector | |
141 dest->preds. */ | |
142 unsigned int dest_idx; | |
143 | |
144 int flags; /* see EDGE_* below */ | |
145 int probability; /* biased by REG_BR_PROB_BASE */ | |
146 gcov_type count; /* Expected number of executions calculated | |
147 in profile.c */ | |
148 }; | |
149 | |
150 DEF_VEC_P(edge); | |
151 DEF_VEC_ALLOC_P(edge,gc); | |
152 DEF_VEC_ALLOC_P(edge,heap); | |
153 | |
154 #define EDGE_FALLTHRU 1 /* 'Straight line' flow */ | |
155 #define EDGE_ABNORMAL 2 /* Strange flow, like computed | |
156 label, or eh */ | |
157 #define EDGE_ABNORMAL_CALL 4 /* Call with abnormal exit | |
158 like an exception, or sibcall */ | |
159 #define EDGE_EH 8 /* Exception throw */ | |
160 #define EDGE_FAKE 16 /* Not a real edge (profile.c) */ | |
161 #define EDGE_DFS_BACK 32 /* A backwards edge */ | |
162 #define EDGE_CAN_FALLTHRU 64 /* Candidate for straight line | |
163 flow. */ | |
164 #define EDGE_IRREDUCIBLE_LOOP 128 /* Part of irreducible loop. */ | |
165 #define EDGE_SIBCALL 256 /* Edge from sibcall to exit. */ | |
166 #define EDGE_LOOP_EXIT 512 /* Exit of a loop. */ | |
167 #define EDGE_TRUE_VALUE 1024 /* Edge taken when controlling | |
168 predicate is nonzero. */ | |
169 #define EDGE_FALSE_VALUE 2048 /* Edge taken when controlling | |
170 predicate is zero. */ | |
171 #define EDGE_EXECUTABLE 4096 /* Edge is executable. Only | |
172 valid during SSA-CCP. */ | |
173 #define EDGE_CROSSING 8192 /* Edge crosses between hot | |
174 and cold sections, when we | |
175 do partitioning. */ | |
176 #define EDGE_ALL_FLAGS 16383 | |
177 | |
178 #define EDGE_COMPLEX (EDGE_ABNORMAL | EDGE_ABNORMAL_CALL | EDGE_EH) | |
179 | |
180 /* Counter summary from the last set of coverage counts read by | |
181 profile.c. */ | |
182 extern const struct gcov_ctr_summary *profile_info; | |
183 | |
184 /* Declared in cfgloop.h. */ | |
185 struct loop; | |
186 | |
187 /* Declared in tree-flow.h. */ | |
188 struct edge_prediction; | |
189 struct rtl_bb_info; | |
190 | |
191 /* A basic block is a sequence of instructions with only entry and | |
192 only one exit. If any one of the instructions are executed, they | |
193 will all be executed, and in sequence from first to last. | |
194 | |
195 There may be COND_EXEC instructions in the basic block. The | |
196 COND_EXEC *instructions* will be executed -- but if the condition | |
197 is false the conditionally executed *expressions* will of course | |
198 not be executed. We don't consider the conditionally executed | |
199 expression (which might have side-effects) to be in a separate | |
200 basic block because the program counter will always be at the same | |
201 location after the COND_EXEC instruction, regardless of whether the | |
202 condition is true or not. | |
203 | |
204 Basic blocks need not start with a label nor end with a jump insn. | |
205 For example, a previous basic block may just "conditionally fall" | |
206 into the succeeding basic block, and the last basic block need not | |
207 end with a jump insn. Block 0 is a descendant of the entry block. | |
208 | |
209 A basic block beginning with two labels cannot have notes between | |
210 the labels. | |
211 | |
212 Data for jump tables are stored in jump_insns that occur in no | |
213 basic block even though these insns can follow or precede insns in | |
214 basic blocks. */ | |
215 | |
216 /* Basic block information indexed by block number. */ | |
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217 struct GTY((chain_next ("%h.next_bb"), chain_prev ("%h.prev_bb"))) basic_block_def { |
0 | 218 /* The edges into and out of the block. */ |
219 VEC(edge,gc) *preds; | |
220 VEC(edge,gc) *succs; | |
221 | |
222 /* Auxiliary info specific to a pass. */ | |
223 PTR GTY ((skip (""))) aux; | |
224 | |
225 /* Innermost loop containing the block. */ | |
226 struct loop *loop_father; | |
227 | |
228 /* The dominance and postdominance information node. */ | |
229 struct et_node * GTY ((skip (""))) dom[2]; | |
230 | |
231 /* Previous and next blocks in the chain. */ | |
232 struct basic_block_def *prev_bb; | |
233 struct basic_block_def *next_bb; | |
234 | |
235 union basic_block_il_dependent { | |
236 struct gimple_bb_info * GTY ((tag ("0"))) gimple; | |
237 struct rtl_bb_info * GTY ((tag ("1"))) rtl; | |
238 } GTY ((desc ("((%1.flags & BB_RTL) != 0)"))) il; | |
239 | |
240 /* Expected number of executions: calculated in profile.c. */ | |
241 gcov_type count; | |
242 | |
243 /* The index of this block. */ | |
244 int index; | |
245 | |
246 /* The loop depth of this block. */ | |
247 int loop_depth; | |
248 | |
249 /* Expected frequency. Normalized to be in range 0 to BB_FREQ_MAX. */ | |
250 int frequency; | |
251 | |
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252 /* The discriminator for this block. */ |
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253 int discriminator; |
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254 |
0 | 255 /* Various flags. See BB_* below. */ |
256 int flags; | |
257 }; | |
258 | |
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259 struct GTY(()) rtl_bb_info { |
0 | 260 /* The first and last insns of the block. */ |
261 rtx head_; | |
262 rtx end_; | |
263 | |
264 /* In CFGlayout mode points to insn notes/jumptables to be placed just before | |
265 and after the block. */ | |
266 rtx header; | |
267 rtx footer; | |
268 | |
269 /* This field is used by the bb-reorder and tracer passes. */ | |
270 int visited; | |
271 }; | |
272 | |
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273 struct GTY(()) gimple_bb_info { |
0 | 274 /* Sequence of statements in this block. */ |
275 gimple_seq seq; | |
276 | |
277 /* PHI nodes for this block. */ | |
278 gimple_seq phi_nodes; | |
279 }; | |
280 | |
281 DEF_VEC_P(basic_block); | |
282 DEF_VEC_ALLOC_P(basic_block,gc); | |
283 DEF_VEC_ALLOC_P(basic_block,heap); | |
284 | |
285 #define BB_FREQ_MAX 10000 | |
286 | |
287 /* Masks for basic_block.flags. | |
288 | |
289 BB_HOT_PARTITION and BB_COLD_PARTITION should be preserved throughout | |
290 the compilation, so they are never cleared. | |
291 | |
292 All other flags may be cleared by clear_bb_flags(). It is generally | |
293 a bad idea to rely on any flags being up-to-date. */ | |
294 | |
295 enum bb_flags | |
296 { | |
297 /* Only set on blocks that have just been created by create_bb. */ | |
298 BB_NEW = 1 << 0, | |
299 | |
300 /* Set by find_unreachable_blocks. Do not rely on this being set in any | |
301 pass. */ | |
302 BB_REACHABLE = 1 << 1, | |
303 | |
304 /* Set for blocks in an irreducible loop by loop analysis. */ | |
305 BB_IRREDUCIBLE_LOOP = 1 << 2, | |
306 | |
307 /* Set on blocks that may actually not be single-entry single-exit block. */ | |
308 BB_SUPERBLOCK = 1 << 3, | |
309 | |
310 /* Set on basic blocks that the scheduler should not touch. This is used | |
311 by SMS to prevent other schedulers from messing with the loop schedule. */ | |
312 BB_DISABLE_SCHEDULE = 1 << 4, | |
313 | |
314 /* Set on blocks that should be put in a hot section. */ | |
315 BB_HOT_PARTITION = 1 << 5, | |
316 | |
317 /* Set on blocks that should be put in a cold section. */ | |
318 BB_COLD_PARTITION = 1 << 6, | |
319 | |
320 /* Set on block that was duplicated. */ | |
321 BB_DUPLICATED = 1 << 7, | |
322 | |
323 /* Set if the label at the top of this block is the target of a non-local goto. */ | |
324 BB_NON_LOCAL_GOTO_TARGET = 1 << 8, | |
325 | |
326 /* Set on blocks that are in RTL format. */ | |
327 BB_RTL = 1 << 9 , | |
328 | |
329 /* Set on blocks that are forwarder blocks. | |
330 Only used in cfgcleanup.c. */ | |
331 BB_FORWARDER_BLOCK = 1 << 10, | |
332 | |
333 /* Set on blocks that cannot be threaded through. | |
334 Only used in cfgcleanup.c. */ | |
335 BB_NONTHREADABLE_BLOCK = 1 << 11 | |
336 }; | |
337 | |
338 /* Dummy flag for convenience in the hot/cold partitioning code. */ | |
339 #define BB_UNPARTITIONED 0 | |
340 | |
341 /* Partitions, to be used when partitioning hot and cold basic blocks into | |
342 separate sections. */ | |
343 #define BB_PARTITION(bb) ((bb)->flags & (BB_HOT_PARTITION|BB_COLD_PARTITION)) | |
344 #define BB_SET_PARTITION(bb, part) do { \ | |
345 basic_block bb_ = (bb); \ | |
346 bb_->flags = ((bb_->flags & ~(BB_HOT_PARTITION|BB_COLD_PARTITION)) \ | |
347 | (part)); \ | |
348 } while (0) | |
349 | |
350 #define BB_COPY_PARTITION(dstbb, srcbb) \ | |
351 BB_SET_PARTITION (dstbb, BB_PARTITION (srcbb)) | |
352 | |
353 /* State of dominance information. */ | |
354 | |
355 enum dom_state | |
356 { | |
357 DOM_NONE, /* Not computed at all. */ | |
358 DOM_NO_FAST_QUERY, /* The data is OK, but the fast query data are not usable. */ | |
359 DOM_OK /* Everything is ok. */ | |
360 }; | |
361 | |
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362 /* What sort of profiling information we have. */ |
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363 enum profile_status_d |
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364 { |
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365 PROFILE_ABSENT, |
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366 PROFILE_GUESSED, |
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367 PROFILE_READ |
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368 }; |
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369 |
0 | 370 /* A structure to group all the per-function control flow graph data. |
371 The x_* prefixing is necessary because otherwise references to the | |
372 fields of this struct are interpreted as the defines for backward | |
373 source compatibility following the definition of this struct. */ | |
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374 struct GTY(()) control_flow_graph { |
0 | 375 /* Block pointers for the exit and entry of a function. |
376 These are always the head and tail of the basic block list. */ | |
377 basic_block x_entry_block_ptr; | |
378 basic_block x_exit_block_ptr; | |
379 | |
380 /* Index by basic block number, get basic block struct info. */ | |
381 VEC(basic_block,gc) *x_basic_block_info; | |
382 | |
383 /* Number of basic blocks in this flow graph. */ | |
384 int x_n_basic_blocks; | |
385 | |
386 /* Number of edges in this flow graph. */ | |
387 int x_n_edges; | |
388 | |
389 /* The first free basic block number. */ | |
390 int x_last_basic_block; | |
391 | |
392 /* Mapping of labels to their associated blocks. At present | |
393 only used for the gimple CFG. */ | |
394 VEC(basic_block,gc) *x_label_to_block_map; | |
395 | |
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396 enum profile_status_d x_profile_status; |
0 | 397 |
398 /* Whether the dominators and the postdominators are available. */ | |
399 enum dom_state x_dom_computed[2]; | |
400 | |
401 /* Number of basic blocks in the dominance tree. */ | |
402 unsigned x_n_bbs_in_dom_tree[2]; | |
403 | |
404 /* Maximal number of entities in the single jumptable. Used to estimate | |
405 final flowgraph size. */ | |
406 int max_jumptable_ents; | |
407 | |
408 /* UIDs for LABEL_DECLs. */ | |
409 int last_label_uid; | |
410 }; | |
411 | |
412 /* Defines for accessing the fields of the CFG structure for function FN. */ | |
413 #define ENTRY_BLOCK_PTR_FOR_FUNCTION(FN) ((FN)->cfg->x_entry_block_ptr) | |
414 #define EXIT_BLOCK_PTR_FOR_FUNCTION(FN) ((FN)->cfg->x_exit_block_ptr) | |
415 #define basic_block_info_for_function(FN) ((FN)->cfg->x_basic_block_info) | |
416 #define n_basic_blocks_for_function(FN) ((FN)->cfg->x_n_basic_blocks) | |
417 #define n_edges_for_function(FN) ((FN)->cfg->x_n_edges) | |
418 #define last_basic_block_for_function(FN) ((FN)->cfg->x_last_basic_block) | |
419 #define label_to_block_map_for_function(FN) ((FN)->cfg->x_label_to_block_map) | |
420 #define profile_status_for_function(FN) ((FN)->cfg->x_profile_status) | |
421 | |
422 #define BASIC_BLOCK_FOR_FUNCTION(FN,N) \ | |
423 (VEC_index (basic_block, basic_block_info_for_function(FN), (N))) | |
424 #define SET_BASIC_BLOCK_FOR_FUNCTION(FN,N,BB) \ | |
425 (VEC_replace (basic_block, basic_block_info_for_function(FN), (N), (BB))) | |
426 | |
427 /* Defines for textual backward source compatibility. */ | |
428 #define ENTRY_BLOCK_PTR (cfun->cfg->x_entry_block_ptr) | |
429 #define EXIT_BLOCK_PTR (cfun->cfg->x_exit_block_ptr) | |
430 #define basic_block_info (cfun->cfg->x_basic_block_info) | |
431 #define n_basic_blocks (cfun->cfg->x_n_basic_blocks) | |
432 #define n_edges (cfun->cfg->x_n_edges) | |
433 #define last_basic_block (cfun->cfg->x_last_basic_block) | |
434 #define label_to_block_map (cfun->cfg->x_label_to_block_map) | |
435 #define profile_status (cfun->cfg->x_profile_status) | |
436 | |
437 #define BASIC_BLOCK(N) (VEC_index (basic_block, basic_block_info, (N))) | |
438 #define SET_BASIC_BLOCK(N,BB) (VEC_replace (basic_block, basic_block_info, (N), (BB))) | |
439 | |
440 /* For iterating over basic blocks. */ | |
441 #define FOR_BB_BETWEEN(BB, FROM, TO, DIR) \ | |
442 for (BB = FROM; BB != TO; BB = BB->DIR) | |
443 | |
444 #define FOR_EACH_BB_FN(BB, FN) \ | |
445 FOR_BB_BETWEEN (BB, (FN)->cfg->x_entry_block_ptr->next_bb, (FN)->cfg->x_exit_block_ptr, next_bb) | |
446 | |
447 #define FOR_EACH_BB(BB) FOR_EACH_BB_FN (BB, cfun) | |
448 | |
449 #define FOR_EACH_BB_REVERSE_FN(BB, FN) \ | |
450 FOR_BB_BETWEEN (BB, (FN)->cfg->x_exit_block_ptr->prev_bb, (FN)->cfg->x_entry_block_ptr, prev_bb) | |
451 | |
452 #define FOR_EACH_BB_REVERSE(BB) FOR_EACH_BB_REVERSE_FN(BB, cfun) | |
453 | |
454 /* For iterating over insns in basic block. */ | |
455 #define FOR_BB_INSNS(BB, INSN) \ | |
456 for ((INSN) = BB_HEAD (BB); \ | |
457 (INSN) && (INSN) != NEXT_INSN (BB_END (BB)); \ | |
458 (INSN) = NEXT_INSN (INSN)) | |
459 | |
460 /* For iterating over insns in basic block when we might remove the | |
461 current insn. */ | |
462 #define FOR_BB_INSNS_SAFE(BB, INSN, CURR) \ | |
463 for ((INSN) = BB_HEAD (BB), (CURR) = (INSN) ? NEXT_INSN ((INSN)): NULL; \ | |
464 (INSN) && (INSN) != NEXT_INSN (BB_END (BB)); \ | |
465 (INSN) = (CURR), (CURR) = (INSN) ? NEXT_INSN ((INSN)) : NULL) | |
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466 |
0 | 467 #define FOR_BB_INSNS_REVERSE(BB, INSN) \ |
468 for ((INSN) = BB_END (BB); \ | |
469 (INSN) && (INSN) != PREV_INSN (BB_HEAD (BB)); \ | |
470 (INSN) = PREV_INSN (INSN)) | |
471 | |
472 #define FOR_BB_INSNS_REVERSE_SAFE(BB, INSN, CURR) \ | |
473 for ((INSN) = BB_END (BB),(CURR) = (INSN) ? PREV_INSN ((INSN)) : NULL; \ | |
474 (INSN) && (INSN) != PREV_INSN (BB_HEAD (BB)); \ | |
475 (INSN) = (CURR), (CURR) = (INSN) ? PREV_INSN ((INSN)) : NULL) | |
476 | |
477 /* Cycles through _all_ basic blocks, even the fake ones (entry and | |
478 exit block). */ | |
479 | |
480 #define FOR_ALL_BB(BB) \ | |
481 for (BB = ENTRY_BLOCK_PTR; BB; BB = BB->next_bb) | |
482 | |
483 #define FOR_ALL_BB_FN(BB, FN) \ | |
484 for (BB = ENTRY_BLOCK_PTR_FOR_FUNCTION (FN); BB; BB = BB->next_bb) | |
485 | |
486 extern bitmap_obstack reg_obstack; | |
487 | |
488 | |
489 /* Stuff for recording basic block info. */ | |
490 | |
491 #define BB_HEAD(B) (B)->il.rtl->head_ | |
492 #define BB_END(B) (B)->il.rtl->end_ | |
493 | |
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494 /* Special block numbers [markers] for entry and exit. |
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495 Neither of them is supposed to hold actual statements. */ |
0 | 496 #define ENTRY_BLOCK (0) |
497 #define EXIT_BLOCK (1) | |
498 | |
499 /* The two blocks that are always in the cfg. */ | |
500 #define NUM_FIXED_BLOCKS (2) | |
501 | |
502 | |
503 #define BLOCK_NUM(INSN) (BLOCK_FOR_INSN (INSN)->index + 0) | |
504 #define set_block_for_insn(INSN, BB) (BLOCK_FOR_INSN (INSN) = BB) | |
505 | |
506 extern void compute_bb_for_insn (void); | |
507 extern unsigned int free_bb_for_insn (void); | |
508 extern void update_bb_for_insn (basic_block); | |
509 | |
510 extern void insert_insn_on_edge (rtx, edge); | |
511 basic_block split_edge_and_insert (edge, rtx); | |
512 | |
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513 extern void commit_one_edge_insertion (edge e); |
0 | 514 extern void commit_edge_insertions (void); |
515 | |
516 extern void remove_fake_edges (void); | |
517 extern void remove_fake_exit_edges (void); | |
518 extern void add_noreturn_fake_exit_edges (void); | |
519 extern void connect_infinite_loops_to_exit (void); | |
520 extern edge unchecked_make_edge (basic_block, basic_block, int); | |
521 extern edge cached_make_edge (sbitmap, basic_block, basic_block, int); | |
522 extern edge make_edge (basic_block, basic_block, int); | |
523 extern edge make_single_succ_edge (basic_block, basic_block, int); | |
524 extern void remove_edge_raw (edge); | |
525 extern void redirect_edge_succ (edge, basic_block); | |
526 extern edge redirect_edge_succ_nodup (edge, basic_block); | |
527 extern void redirect_edge_pred (edge, basic_block); | |
528 extern basic_block create_basic_block_structure (rtx, rtx, rtx, basic_block); | |
529 extern void clear_bb_flags (void); | |
530 extern int post_order_compute (int *, bool, bool); | |
531 extern int inverted_post_order_compute (int *); | |
532 extern int pre_and_rev_post_order_compute (int *, int *, bool); | |
533 extern int dfs_enumerate_from (basic_block, int, | |
534 bool (*)(const_basic_block, const void *), | |
535 basic_block *, int, const void *); | |
536 extern void compute_dominance_frontiers (bitmap *); | |
537 extern bitmap compute_idf (bitmap, bitmap *); | |
538 extern void dump_bb_info (basic_block, bool, bool, int, const char *, FILE *); | |
539 extern void dump_edge_info (FILE *, edge, int); | |
540 extern void brief_dump_cfg (FILE *); | |
541 extern void clear_edges (void); | |
542 extern void scale_bbs_frequencies_int (basic_block *, int, int, int); | |
543 extern void scale_bbs_frequencies_gcov_type (basic_block *, int, gcov_type, | |
544 gcov_type); | |
545 | |
546 /* Structure to group all of the information to process IF-THEN and | |
547 IF-THEN-ELSE blocks for the conditional execution support. This | |
548 needs to be in a public file in case the IFCVT macros call | |
549 functions passing the ce_if_block data structure. */ | |
550 | |
551 typedef struct ce_if_block | |
552 { | |
553 basic_block test_bb; /* First test block. */ | |
554 basic_block then_bb; /* THEN block. */ | |
555 basic_block else_bb; /* ELSE block or NULL. */ | |
556 basic_block join_bb; /* Join THEN/ELSE blocks. */ | |
557 basic_block last_test_bb; /* Last bb to hold && or || tests. */ | |
558 int num_multiple_test_blocks; /* # of && and || basic blocks. */ | |
559 int num_and_and_blocks; /* # of && blocks. */ | |
560 int num_or_or_blocks; /* # of || blocks. */ | |
561 int num_multiple_test_insns; /* # of insns in && and || blocks. */ | |
562 int and_and_p; /* Complex test is &&. */ | |
563 int num_then_insns; /* # of insns in THEN block. */ | |
564 int num_else_insns; /* # of insns in ELSE block. */ | |
565 int pass; /* Pass number. */ | |
566 | |
567 #ifdef IFCVT_EXTRA_FIELDS | |
568 IFCVT_EXTRA_FIELDS /* Any machine dependent fields. */ | |
569 #endif | |
570 | |
571 } ce_if_block_t; | |
572 | |
573 /* This structure maintains an edge list vector. */ | |
574 struct edge_list | |
575 { | |
576 int num_blocks; | |
577 int num_edges; | |
578 edge *index_to_edge; | |
579 }; | |
580 | |
581 /* The base value for branch probability notes and edge probabilities. */ | |
582 #define REG_BR_PROB_BASE 10000 | |
583 | |
584 /* This is the value which indicates no edge is present. */ | |
585 #define EDGE_INDEX_NO_EDGE -1 | |
586 | |
587 /* EDGE_INDEX returns an integer index for an edge, or EDGE_INDEX_NO_EDGE | |
588 if there is no edge between the 2 basic blocks. */ | |
589 #define EDGE_INDEX(el, pred, succ) (find_edge_index ((el), (pred), (succ))) | |
590 | |
591 /* INDEX_EDGE_PRED_BB and INDEX_EDGE_SUCC_BB return a pointer to the basic | |
592 block which is either the pred or succ end of the indexed edge. */ | |
593 #define INDEX_EDGE_PRED_BB(el, index) ((el)->index_to_edge[(index)]->src) | |
594 #define INDEX_EDGE_SUCC_BB(el, index) ((el)->index_to_edge[(index)]->dest) | |
595 | |
596 /* INDEX_EDGE returns a pointer to the edge. */ | |
597 #define INDEX_EDGE(el, index) ((el)->index_to_edge[(index)]) | |
598 | |
599 /* Number of edges in the compressed edge list. */ | |
600 #define NUM_EDGES(el) ((el)->num_edges) | |
601 | |
602 /* BB is assumed to contain conditional jump. Return the fallthru edge. */ | |
603 #define FALLTHRU_EDGE(bb) (EDGE_SUCC ((bb), 0)->flags & EDGE_FALLTHRU \ | |
604 ? EDGE_SUCC ((bb), 0) : EDGE_SUCC ((bb), 1)) | |
605 | |
606 /* BB is assumed to contain conditional jump. Return the branch edge. */ | |
607 #define BRANCH_EDGE(bb) (EDGE_SUCC ((bb), 0)->flags & EDGE_FALLTHRU \ | |
608 ? EDGE_SUCC ((bb), 1) : EDGE_SUCC ((bb), 0)) | |
609 | |
610 /* Return expected execution frequency of the edge E. */ | |
611 #define EDGE_FREQUENCY(e) (((e)->src->frequency \ | |
612 * (e)->probability \ | |
613 + REG_BR_PROB_BASE / 2) \ | |
614 / REG_BR_PROB_BASE) | |
615 | |
616 /* Return nonzero if edge is critical. */ | |
617 #define EDGE_CRITICAL_P(e) (EDGE_COUNT ((e)->src->succs) >= 2 \ | |
618 && EDGE_COUNT ((e)->dest->preds) >= 2) | |
619 | |
620 #define EDGE_COUNT(ev) VEC_length (edge, (ev)) | |
621 #define EDGE_I(ev,i) VEC_index (edge, (ev), (i)) | |
622 #define EDGE_PRED(bb,i) VEC_index (edge, (bb)->preds, (i)) | |
623 #define EDGE_SUCC(bb,i) VEC_index (edge, (bb)->succs, (i)) | |
624 | |
625 /* Returns true if BB has precisely one successor. */ | |
626 | |
627 static inline bool | |
628 single_succ_p (const_basic_block bb) | |
629 { | |
630 return EDGE_COUNT (bb->succs) == 1; | |
631 } | |
632 | |
633 /* Returns true if BB has precisely one predecessor. */ | |
634 | |
635 static inline bool | |
636 single_pred_p (const_basic_block bb) | |
637 { | |
638 return EDGE_COUNT (bb->preds) == 1; | |
639 } | |
640 | |
641 /* Returns the single successor edge of basic block BB. Aborts if | |
642 BB does not have exactly one successor. */ | |
643 | |
644 static inline edge | |
645 single_succ_edge (const_basic_block bb) | |
646 { | |
647 gcc_assert (single_succ_p (bb)); | |
648 return EDGE_SUCC (bb, 0); | |
649 } | |
650 | |
651 /* Returns the single predecessor edge of basic block BB. Aborts | |
652 if BB does not have exactly one predecessor. */ | |
653 | |
654 static inline edge | |
655 single_pred_edge (const_basic_block bb) | |
656 { | |
657 gcc_assert (single_pred_p (bb)); | |
658 return EDGE_PRED (bb, 0); | |
659 } | |
660 | |
661 /* Returns the single successor block of basic block BB. Aborts | |
662 if BB does not have exactly one successor. */ | |
663 | |
664 static inline basic_block | |
665 single_succ (const_basic_block bb) | |
666 { | |
667 return single_succ_edge (bb)->dest; | |
668 } | |
669 | |
670 /* Returns the single predecessor block of basic block BB. Aborts | |
671 if BB does not have exactly one predecessor.*/ | |
672 | |
673 static inline basic_block | |
674 single_pred (const_basic_block bb) | |
675 { | |
676 return single_pred_edge (bb)->src; | |
677 } | |
678 | |
679 /* Iterator object for edges. */ | |
680 | |
681 typedef struct { | |
682 unsigned index; | |
683 VEC(edge,gc) **container; | |
684 } edge_iterator; | |
685 | |
686 static inline VEC(edge,gc) * | |
687 ei_container (edge_iterator i) | |
688 { | |
689 gcc_assert (i.container); | |
690 return *i.container; | |
691 } | |
692 | |
693 #define ei_start(iter) ei_start_1 (&(iter)) | |
694 #define ei_last(iter) ei_last_1 (&(iter)) | |
695 | |
696 /* Return an iterator pointing to the start of an edge vector. */ | |
697 static inline edge_iterator | |
698 ei_start_1 (VEC(edge,gc) **ev) | |
699 { | |
700 edge_iterator i; | |
701 | |
702 i.index = 0; | |
703 i.container = ev; | |
704 | |
705 return i; | |
706 } | |
707 | |
708 /* Return an iterator pointing to the last element of an edge | |
709 vector. */ | |
710 static inline edge_iterator | |
711 ei_last_1 (VEC(edge,gc) **ev) | |
712 { | |
713 edge_iterator i; | |
714 | |
715 i.index = EDGE_COUNT (*ev) - 1; | |
716 i.container = ev; | |
717 | |
718 return i; | |
719 } | |
720 | |
721 /* Is the iterator `i' at the end of the sequence? */ | |
722 static inline bool | |
723 ei_end_p (edge_iterator i) | |
724 { | |
725 return (i.index == EDGE_COUNT (ei_container (i))); | |
726 } | |
727 | |
728 /* Is the iterator `i' at one position before the end of the | |
729 sequence? */ | |
730 static inline bool | |
731 ei_one_before_end_p (edge_iterator i) | |
732 { | |
733 return (i.index + 1 == EDGE_COUNT (ei_container (i))); | |
734 } | |
735 | |
736 /* Advance the iterator to the next element. */ | |
737 static inline void | |
738 ei_next (edge_iterator *i) | |
739 { | |
740 gcc_assert (i->index < EDGE_COUNT (ei_container (*i))); | |
741 i->index++; | |
742 } | |
743 | |
744 /* Move the iterator to the previous element. */ | |
745 static inline void | |
746 ei_prev (edge_iterator *i) | |
747 { | |
748 gcc_assert (i->index > 0); | |
749 i->index--; | |
750 } | |
751 | |
752 /* Return the edge pointed to by the iterator `i'. */ | |
753 static inline edge | |
754 ei_edge (edge_iterator i) | |
755 { | |
756 return EDGE_I (ei_container (i), i.index); | |
757 } | |
758 | |
759 /* Return an edge pointed to by the iterator. Do it safely so that | |
760 NULL is returned when the iterator is pointing at the end of the | |
761 sequence. */ | |
762 static inline edge | |
763 ei_safe_edge (edge_iterator i) | |
764 { | |
765 return !ei_end_p (i) ? ei_edge (i) : NULL; | |
766 } | |
767 | |
768 /* Return 1 if we should continue to iterate. Return 0 otherwise. | |
769 *Edge P is set to the next edge if we are to continue to iterate | |
770 and NULL otherwise. */ | |
771 | |
772 static inline bool | |
773 ei_cond (edge_iterator ei, edge *p) | |
774 { | |
775 if (!ei_end_p (ei)) | |
776 { | |
777 *p = ei_edge (ei); | |
778 return 1; | |
779 } | |
780 else | |
781 { | |
782 *p = NULL; | |
783 return 0; | |
784 } | |
785 } | |
786 | |
787 /* This macro serves as a convenient way to iterate each edge in a | |
788 vector of predecessor or successor edges. It must not be used when | |
789 an element might be removed during the traversal, otherwise | |
790 elements will be missed. Instead, use a for-loop like that shown | |
791 in the following pseudo-code: | |
792 | |
793 FOR (ei = ei_start (bb->succs); (e = ei_safe_edge (ei)); ) | |
794 { | |
795 IF (e != taken_edge) | |
796 remove_edge (e); | |
797 ELSE | |
798 ei_next (&ei); | |
799 } | |
800 */ | |
801 | |
802 #define FOR_EACH_EDGE(EDGE,ITER,EDGE_VEC) \ | |
803 for ((ITER) = ei_start ((EDGE_VEC)); \ | |
804 ei_cond ((ITER), &(EDGE)); \ | |
805 ei_next (&(ITER))) | |
806 | |
807 struct edge_list * create_edge_list (void); | |
808 void free_edge_list (struct edge_list *); | |
809 void print_edge_list (FILE *, struct edge_list *); | |
810 void verify_edge_list (FILE *, struct edge_list *); | |
811 int find_edge_index (struct edge_list *, basic_block, basic_block); | |
812 edge find_edge (basic_block, basic_block); | |
813 | |
814 #define CLEANUP_EXPENSIVE 1 /* Do relatively expensive optimizations | |
815 except for edge forwarding */ | |
816 #define CLEANUP_CROSSJUMP 2 /* Do crossjumping. */ | |
817 #define CLEANUP_POST_REGSTACK 4 /* We run after reg-stack and need | |
818 to care REG_DEAD notes. */ | |
819 #define CLEANUP_THREADING 8 /* Do jump threading. */ | |
820 #define CLEANUP_NO_INSN_DEL 16 /* Do not try to delete trivially dead | |
821 insns. */ | |
822 #define CLEANUP_CFGLAYOUT 32 /* Do cleanup in cfglayout mode. */ | |
823 | |
824 /* In lcm.c */ | |
825 extern struct edge_list *pre_edge_lcm (int, sbitmap *, sbitmap *, | |
826 sbitmap *, sbitmap *, sbitmap **, | |
827 sbitmap **); | |
828 extern struct edge_list *pre_edge_rev_lcm (int, sbitmap *, | |
829 sbitmap *, sbitmap *, | |
830 sbitmap *, sbitmap **, | |
831 sbitmap **); | |
832 extern void compute_available (sbitmap *, sbitmap *, sbitmap *, sbitmap *); | |
833 | |
834 /* In predict.c */ | |
835 extern bool maybe_hot_bb_p (const_basic_block); | |
836 extern bool maybe_hot_edge_p (edge); | |
837 extern bool probably_never_executed_bb_p (const_basic_block); | |
838 extern bool optimize_bb_for_size_p (const_basic_block); | |
839 extern bool optimize_bb_for_speed_p (const_basic_block); | |
840 extern bool optimize_edge_for_size_p (edge); | |
841 extern bool optimize_edge_for_speed_p (edge); | |
842 extern bool optimize_function_for_size_p (struct function *); | |
843 extern bool optimize_function_for_speed_p (struct function *); | |
844 extern bool optimize_loop_for_size_p (struct loop *); | |
845 extern bool optimize_loop_for_speed_p (struct loop *); | |
846 extern bool optimize_loop_nest_for_size_p (struct loop *); | |
847 extern bool optimize_loop_nest_for_speed_p (struct loop *); | |
848 extern bool gimple_predicted_by_p (const_basic_block, enum br_predictor); | |
849 extern bool rtl_predicted_by_p (const_basic_block, enum br_predictor); | |
850 extern void gimple_predict_edge (edge, enum br_predictor, int); | |
851 extern void rtl_predict_edge (edge, enum br_predictor, int); | |
852 extern void predict_edge_def (edge, enum br_predictor, enum prediction); | |
853 extern void guess_outgoing_edge_probabilities (basic_block); | |
854 extern void remove_predictions_associated_with_edge (edge); | |
855 extern bool edge_probability_reliable_p (const_edge); | |
856 extern bool br_prob_note_reliable_p (const_rtx); | |
857 extern bool predictable_edge_p (edge); | |
858 | |
859 /* In cfg.c */ | |
860 extern void init_flow (struct function *); | |
861 extern void debug_bb (basic_block); | |
862 extern basic_block debug_bb_n (int); | |
863 extern void dump_regset (regset, FILE *); | |
864 extern void debug_regset (regset); | |
865 extern void expunge_block (basic_block); | |
866 extern void link_block (basic_block, basic_block); | |
867 extern void unlink_block (basic_block); | |
868 extern void compact_blocks (void); | |
869 extern basic_block alloc_block (void); | |
870 extern void alloc_aux_for_block (basic_block, int); | |
871 extern void alloc_aux_for_blocks (int); | |
872 extern void clear_aux_for_blocks (void); | |
873 extern void free_aux_for_blocks (void); | |
874 extern void alloc_aux_for_edge (edge, int); | |
875 extern void alloc_aux_for_edges (int); | |
876 extern void clear_aux_for_edges (void); | |
877 extern void free_aux_for_edges (void); | |
878 | |
879 /* In cfganal.c */ | |
880 extern void find_unreachable_blocks (void); | |
881 extern bool forwarder_block_p (const_basic_block); | |
882 extern bool can_fallthru (basic_block, basic_block); | |
883 extern bool could_fall_through (basic_block, basic_block); | |
884 extern void flow_nodes_print (const char *, const_sbitmap, FILE *); | |
885 extern void flow_edge_list_print (const char *, const edge *, int, FILE *); | |
886 | |
887 /* In cfgrtl.c */ | |
888 extern basic_block force_nonfallthru (edge); | |
889 extern rtx block_label (basic_block); | |
890 extern bool purge_all_dead_edges (void); | |
891 extern bool purge_dead_edges (basic_block); | |
892 | |
893 /* In cfgbuild.c. */ | |
894 extern void find_many_sub_basic_blocks (sbitmap); | |
895 extern void rtl_make_eh_edge (sbitmap, basic_block, rtx); | |
896 | |
897 /* In cfgcleanup.c. */ | |
898 extern bool cleanup_cfg (int); | |
899 extern bool delete_unreachable_blocks (void); | |
900 | |
901 extern bool mark_dfs_back_edges (void); | |
902 extern void set_edge_can_fallthru_flag (void); | |
903 extern void update_br_prob_note (basic_block); | |
904 extern void fixup_abnormal_edges (void); | |
905 extern bool inside_basic_block_p (const_rtx); | |
906 extern bool control_flow_insn_p (const_rtx); | |
907 extern rtx get_last_bb_insn (basic_block); | |
908 | |
909 /* In bb-reorder.c */ | |
910 extern void reorder_basic_blocks (void); | |
911 | |
912 /* In dominance.c */ | |
913 | |
914 enum cdi_direction | |
915 { | |
916 CDI_DOMINATORS = 1, | |
917 CDI_POST_DOMINATORS = 2 | |
918 }; | |
919 | |
920 extern enum dom_state dom_info_state (enum cdi_direction); | |
921 extern void set_dom_info_availability (enum cdi_direction, enum dom_state); | |
922 extern bool dom_info_available_p (enum cdi_direction); | |
923 extern void calculate_dominance_info (enum cdi_direction); | |
924 extern void free_dominance_info (enum cdi_direction); | |
925 extern basic_block nearest_common_dominator (enum cdi_direction, | |
926 basic_block, basic_block); | |
927 extern basic_block nearest_common_dominator_for_set (enum cdi_direction, | |
928 bitmap); | |
929 extern void set_immediate_dominator (enum cdi_direction, basic_block, | |
930 basic_block); | |
931 extern basic_block get_immediate_dominator (enum cdi_direction, basic_block); | |
932 extern bool dominated_by_p (enum cdi_direction, const_basic_block, const_basic_block); | |
933 extern VEC (basic_block, heap) *get_dominated_by (enum cdi_direction, basic_block); | |
934 extern VEC (basic_block, heap) *get_dominated_by_region (enum cdi_direction, | |
935 basic_block *, | |
936 unsigned); | |
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937 extern VEC (basic_block, heap) *get_all_dominated_blocks (enum cdi_direction, |
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938 basic_block); |
0 | 939 extern void add_to_dominance_info (enum cdi_direction, basic_block); |
940 extern void delete_from_dominance_info (enum cdi_direction, basic_block); | |
941 basic_block recompute_dominator (enum cdi_direction, basic_block); | |
942 extern void redirect_immediate_dominators (enum cdi_direction, basic_block, | |
943 basic_block); | |
944 extern void iterate_fix_dominators (enum cdi_direction, | |
945 VEC (basic_block, heap) *, bool); | |
946 extern void verify_dominators (enum cdi_direction); | |
947 extern basic_block first_dom_son (enum cdi_direction, basic_block); | |
948 extern basic_block next_dom_son (enum cdi_direction, basic_block); | |
949 unsigned bb_dom_dfs_in (enum cdi_direction, basic_block); | |
950 unsigned bb_dom_dfs_out (enum cdi_direction, basic_block); | |
951 | |
952 extern edge try_redirect_by_replacing_jump (edge, basic_block, bool); | |
953 extern void break_superblocks (void); | |
954 extern void relink_block_chain (bool); | |
955 extern void check_bb_profile (basic_block, FILE *); | |
956 extern void update_bb_profile_for_threading (basic_block, int, gcov_type, edge); | |
957 extern void init_rtl_bb_info (basic_block); | |
958 | |
959 extern void initialize_original_copy_tables (void); | |
960 extern void free_original_copy_tables (void); | |
961 extern void set_bb_original (basic_block, basic_block); | |
962 extern basic_block get_bb_original (basic_block); | |
963 extern void set_bb_copy (basic_block, basic_block); | |
964 extern basic_block get_bb_copy (basic_block); | |
965 void set_loop_copy (struct loop *, struct loop *); | |
966 struct loop *get_loop_copy (struct loop *); | |
967 | |
968 | |
969 extern rtx insert_insn_end_bb_new (rtx, basic_block); | |
970 | |
971 #include "cfghooks.h" | |
972 | |
973 /* Return true when one of the predecessor edges of BB is marked with EDGE_EH. */ | |
974 static inline bool | |
975 bb_has_eh_pred (basic_block bb) | |
976 { | |
977 edge e; | |
978 edge_iterator ei; | |
979 | |
980 FOR_EACH_EDGE (e, ei, bb->preds) | |
981 { | |
982 if (e->flags & EDGE_EH) | |
983 return true; | |
984 } | |
985 return false; | |
986 } | |
987 | |
988 /* Return true when one of the predecessor edges of BB is marked with EDGE_ABNORMAL. */ | |
989 static inline bool | |
990 bb_has_abnormal_pred (basic_block bb) | |
991 { | |
992 edge e; | |
993 edge_iterator ei; | |
994 | |
995 FOR_EACH_EDGE (e, ei, bb->preds) | |
996 { | |
997 if (e->flags & EDGE_ABNORMAL) | |
998 return true; | |
999 } | |
1000 return false; | |
1001 } | |
1002 | |
1003 /* In cfgloopmanip.c. */ | |
1004 extern edge mfb_kj_edge; | |
1005 extern bool mfb_keep_just (edge); | |
1006 | |
1007 /* In cfgexpand.c. */ | |
1008 extern void rtl_profile_for_bb (basic_block); | |
1009 extern void rtl_profile_for_edge (edge); | |
1010 extern void default_rtl_profile (void); | |
1011 | |
1012 #endif /* GCC_BASIC_BLOCK_H */ |