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4d779342 | 1 | /* Allocation for dataflow support routines. |
fa10beec | 2 | Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, |
65e0a0f3 | 3 | 2008, 2009, 2010, 2011 Free Software Foundation, Inc. |
b8698a0f | 4 | Originally contributed by Michael P. Hayes |
4d779342 DB |
5 | (m.hayes@elec.canterbury.ac.nz, mhayes@redhat.com) |
6 | Major rewrite contributed by Danny Berlin (dberlin@dberlin.org) | |
7 | and Kenneth Zadeck (zadeck@naturalbridge.com). | |
8 | ||
9 | This file is part of GCC. | |
10 | ||
11 | GCC is free software; you can redistribute it and/or modify it under | |
12 | the terms of the GNU General Public License as published by the Free | |
9dcd6f09 | 13 | Software Foundation; either version 3, or (at your option) any later |
4d779342 DB |
14 | version. |
15 | ||
16 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
17 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
18 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
19 | for more details. | |
20 | ||
21 | You should have received a copy of the GNU General Public License | |
9dcd6f09 NC |
22 | along with GCC; see the file COPYING3. If not see |
23 | <http://www.gnu.org/licenses/>. */ | |
4d779342 DB |
24 | |
25 | /* | |
26 | OVERVIEW: | |
27 | ||
28 | The files in this collection (df*.c,df.h) provide a general framework | |
29 | for solving dataflow problems. The global dataflow is performed using | |
30 | a good implementation of iterative dataflow analysis. | |
31 | ||
32 | The file df-problems.c provides problem instance for the most common | |
33 | dataflow problems: reaching defs, upward exposed uses, live variables, | |
34 | uninitialized variables, def-use chains, and use-def chains. However, | |
35 | the interface allows other dataflow problems to be defined as well. | |
36 | ||
6fb5fa3c DB |
37 | Dataflow analysis is available in most of the rtl backend (the parts |
38 | between pass_df_initialize and pass_df_finish). It is quite likely | |
39 | that these boundaries will be expanded in the future. The only | |
40 | requirement is that there be a correct control flow graph. | |
4d779342 | 41 | |
6fb5fa3c DB |
42 | There are three variations of the live variable problem that are |
43 | available whenever dataflow is available. The LR problem finds the | |
44 | areas that can reach a use of a variable, the UR problems finds the | |
fa10beec | 45 | areas that can be reached from a definition of a variable. The LIVE |
b8698a0f | 46 | problem finds the intersection of these two areas. |
4d779342 | 47 | |
6fb5fa3c DB |
48 | There are several optional problems. These can be enabled when they |
49 | are needed and disabled when they are not needed. | |
4d779342 | 50 | |
6fb5fa3c DB |
51 | Dataflow problems are generally solved in three layers. The bottom |
52 | layer is called scanning where a data structure is built for each rtl | |
53 | insn that describes the set of defs and uses of that insn. Scanning | |
54 | is generally kept up to date, i.e. as the insns changes, the scanned | |
55 | version of that insn changes also. There are various mechanisms for | |
56 | making this happen and are described in the INCREMENTAL SCANNING | |
57 | section. | |
4d779342 | 58 | |
6fb5fa3c | 59 | In the middle layer, basic blocks are scanned to produce transfer |
fa10beec | 60 | functions which describe the effects of that block on the global |
6fb5fa3c | 61 | dataflow solution. The transfer functions are only rebuilt if the |
b8698a0f | 62 | some instruction within the block has changed. |
4d779342 | 63 | |
6fb5fa3c | 64 | The top layer is the dataflow solution itself. The dataflow solution |
0d52bcc1 | 65 | is computed by using an efficient iterative solver and the transfer |
6fb5fa3c DB |
66 | functions. The dataflow solution must be recomputed whenever the |
67 | control changes or if one of the transfer function changes. | |
4d779342 DB |
68 | |
69 | ||
6fb5fa3c | 70 | USAGE: |
4d779342 | 71 | |
6fb5fa3c | 72 | Here is an example of using the dataflow routines. |
4d779342 | 73 | |
05c219bb | 74 | df_[chain,live,note,rd]_add_problem (flags); |
4d779342 | 75 | |
6fb5fa3c | 76 | df_set_blocks (blocks); |
4d779342 | 77 | |
6fb5fa3c | 78 | df_analyze (); |
4d779342 | 79 | |
6fb5fa3c | 80 | df_dump (stderr); |
4d779342 | 81 | |
0d475361 | 82 | df_finish_pass (false); |
4d779342 | 83 | |
05c219bb | 84 | DF_[chain,live,note,rd]_ADD_PROBLEM adds a problem, defined by an |
6fb5fa3c DB |
85 | instance to struct df_problem, to the set of problems solved in this |
86 | instance of df. All calls to add a problem for a given instance of df | |
87 | must occur before the first call to DF_ANALYZE. | |
4d779342 DB |
88 | |
89 | Problems can be dependent on other problems. For instance, solving | |
d1c78882 | 90 | def-use or use-def chains is dependent on solving reaching |
c0220ea4 | 91 | definitions. As long as these dependencies are listed in the problem |
4d779342 DB |
92 | definition, the order of adding the problems is not material. |
93 | Otherwise, the problems will be solved in the order of calls to | |
94 | df_add_problem. Note that it is not necessary to have a problem. In | |
95 | that case, df will just be used to do the scanning. | |
96 | ||
97 | ||
98 | ||
99 | DF_SET_BLOCKS is an optional call used to define a region of the | |
100 | function on which the analysis will be performed. The normal case is | |
101 | to analyze the entire function and no call to df_set_blocks is made. | |
6fb5fa3c DB |
102 | DF_SET_BLOCKS only effects the blocks that are effected when computing |
103 | the transfer functions and final solution. The insn level information | |
104 | is always kept up to date. | |
4d779342 DB |
105 | |
106 | When a subset is given, the analysis behaves as if the function only | |
107 | contains those blocks and any edges that occur directly between the | |
108 | blocks in the set. Care should be taken to call df_set_blocks right | |
c0220ea4 | 109 | before the call to analyze in order to eliminate the possibility that |
4d779342 DB |
110 | optimizations that reorder blocks invalidate the bitvector. |
111 | ||
6fb5fa3c DB |
112 | DF_ANALYZE causes all of the defined problems to be (re)solved. When |
113 | DF_ANALYZE is completes, the IN and OUT sets for each basic block | |
114 | contain the computer information. The DF_*_BB_INFO macros can be used | |
0a41f3b2 | 115 | to access these bitvectors. All deferred rescannings are down before |
0d52bcc1 | 116 | the transfer functions are recomputed. |
4d779342 DB |
117 | |
118 | DF_DUMP can then be called to dump the information produce to some | |
6fb5fa3c DB |
119 | file. This calls DF_DUMP_START, to print the information that is not |
120 | basic block specific, and then calls DF_DUMP_TOP and DF_DUMP_BOTTOM | |
121 | for each block to print the basic specific information. These parts | |
122 | can all be called separately as part of a larger dump function. | |
123 | ||
124 | ||
125 | DF_FINISH_PASS causes df_remove_problem to be called on all of the | |
126 | optional problems. It also causes any insns whose scanning has been | |
0a41f3b2 | 127 | deferred to be rescanned as well as clears all of the changeable flags. |
6fb5fa3c DB |
128 | Setting the pass manager TODO_df_finish flag causes this function to |
129 | be run. However, the pass manager will call df_finish_pass AFTER the | |
130 | pass dumping has been done, so if you want to see the results of the | |
131 | optional problems in the pass dumps, use the TODO flag rather than | |
132 | calling the function yourself. | |
133 | ||
134 | INCREMENTAL SCANNING | |
135 | ||
136 | There are four ways of doing the incremental scanning: | |
137 | ||
138 | 1) Immediate rescanning - Calls to df_insn_rescan, df_notes_rescan, | |
139 | df_bb_delete, df_insn_change_bb have been added to most of | |
140 | the low level service functions that maintain the cfg and change | |
141 | rtl. Calling and of these routines many cause some number of insns | |
142 | to be rescanned. | |
143 | ||
144 | For most modern rtl passes, this is certainly the easiest way to | |
145 | manage rescanning the insns. This technique also has the advantage | |
146 | that the scanning information is always correct and can be relied | |
cea618ac | 147 | upon even after changes have been made to the instructions. This |
6fb5fa3c DB |
148 | technique is contra indicated in several cases: |
149 | ||
150 | a) If def-use chains OR use-def chains (but not both) are built, | |
151 | using this is SIMPLY WRONG. The problem is that when a ref is | |
152 | deleted that is the target of an edge, there is not enough | |
153 | information to efficiently find the source of the edge and | |
154 | delete the edge. This leaves a dangling reference that may | |
155 | cause problems. | |
156 | ||
157 | b) If def-use chains AND use-def chains are built, this may | |
158 | produce unexpected results. The problem is that the incremental | |
159 | scanning of an insn does not know how to repair the chains that | |
160 | point into an insn when the insn changes. So the incremental | |
161 | scanning just deletes the chains that enter and exit the insn | |
162 | being changed. The dangling reference issue in (a) is not a | |
163 | problem here, but if the pass is depending on the chains being | |
164 | maintained after insns have been modified, this technique will | |
165 | not do the correct thing. | |
166 | ||
167 | c) If the pass modifies insns several times, this incremental | |
168 | updating may be expensive. | |
169 | ||
170 | d) If the pass modifies all of the insns, as does register | |
171 | allocation, it is simply better to rescan the entire function. | |
172 | ||
0d52bcc1 | 173 | 2) Deferred rescanning - Calls to df_insn_rescan, df_notes_rescan, and |
6fb5fa3c DB |
174 | df_insn_delete do not immediately change the insn but instead make |
175 | a note that the insn needs to be rescanned. The next call to | |
176 | df_analyze, df_finish_pass, or df_process_deferred_rescans will | |
177 | cause all of the pending rescans to be processed. | |
178 | ||
179 | This is the technique of choice if either 1a, 1b, or 1c are issues | |
ecb7f6de PB |
180 | in the pass. In the case of 1a or 1b, a call to df_finish_pass |
181 | (either manually or via TODO_df_finish) should be made before the | |
182 | next call to df_analyze or df_process_deferred_rescans. | |
183 | ||
184 | This mode is also used by a few passes that still rely on note_uses, | |
185 | note_stores and for_each_rtx instead of using the DF data. This | |
186 | can be said to fall under case 1c. | |
6fb5fa3c DB |
187 | |
188 | To enable this mode, call df_set_flags (DF_DEFER_INSN_RESCAN). | |
189 | (This mode can be cleared by calling df_clear_flags | |
0a41f3b2 | 190 | (DF_DEFER_INSN_RESCAN) but this does not cause the deferred insns to |
6fb5fa3c DB |
191 | be rescanned. |
192 | ||
ecb7f6de PB |
193 | 3) Total rescanning - In this mode the rescanning is disabled. |
194 | Only when insns are deleted is the df information associated with | |
195 | it also deleted. At the end of the pass, a call must be made to | |
196 | df_insn_rescan_all. This method is used by the register allocator | |
197 | since it generally changes each insn multiple times (once for each ref) | |
198 | and does not need to make use of the updated scanning information. | |
6fb5fa3c DB |
199 | |
200 | 4) Do it yourself - In this mechanism, the pass updates the insns | |
6ed3da00 | 201 | itself using the low level df primitives. Currently no pass does |
6fb5fa3c | 202 | this, but it has the advantage that it is quite efficient given |
b8698a0f | 203 | that the pass generally has exact knowledge of what it is changing. |
6fb5fa3c DB |
204 | |
205 | DATA STRUCTURES | |
4d779342 DB |
206 | |
207 | Scanning produces a `struct df_ref' data structure (ref) is allocated | |
208 | for every register reference (def or use) and this records the insn | |
209 | and bb the ref is found within. The refs are linked together in | |
210 | chains of uses and defs for each insn and for each register. Each ref | |
211 | also has a chain field that links all the use refs for a def or all | |
212 | the def refs for a use. This is used to create use-def or def-use | |
213 | chains. | |
214 | ||
215 | Different optimizations have different needs. Ultimately, only | |
216 | register allocation and schedulers should be using the bitmaps | |
217 | produced for the live register and uninitialized register problems. | |
218 | The rest of the backend should be upgraded to using and maintaining | |
219 | the linked information such as def use or use def chains. | |
220 | ||
221 | ||
4d779342 DB |
222 | PHILOSOPHY: |
223 | ||
224 | While incremental bitmaps are not worthwhile to maintain, incremental | |
225 | chains may be perfectly reasonable. The fastest way to build chains | |
226 | from scratch or after significant modifications is to build reaching | |
227 | definitions (RD) and build the chains from this. | |
228 | ||
229 | However, general algorithms for maintaining use-def or def-use chains | |
230 | are not practical. The amount of work to recompute the chain any | |
231 | chain after an arbitrary change is large. However, with a modest | |
232 | amount of work it is generally possible to have the application that | |
233 | uses the chains keep them up to date. The high level knowledge of | |
234 | what is really happening is essential to crafting efficient | |
235 | incremental algorithms. | |
236 | ||
237 | As for the bit vector problems, there is no interface to give a set of | |
238 | blocks over with to resolve the iteration. In general, restarting a | |
239 | dataflow iteration is difficult and expensive. Again, the best way to | |
6fc0bb99 | 240 | keep the dataflow information up to data (if this is really what is |
4d779342 DB |
241 | needed) it to formulate a problem specific solution. |
242 | ||
243 | There are fine grained calls for creating and deleting references from | |
244 | instructions in df-scan.c. However, these are not currently connected | |
245 | to the engine that resolves the dataflow equations. | |
246 | ||
247 | ||
248 | DATA STRUCTURES: | |
249 | ||
b8698a0f | 250 | The basic object is a DF_REF (reference) and this may either be a |
4d779342 DB |
251 | DEF (definition) or a USE of a register. |
252 | ||
253 | These are linked into a variety of lists; namely reg-def, reg-use, | |
254 | insn-def, insn-use, def-use, and use-def lists. For example, the | |
255 | reg-def lists contain all the locations that define a given register | |
256 | while the insn-use lists contain all the locations that use a | |
257 | register. | |
258 | ||
259 | Note that the reg-def and reg-use chains are generally short for | |
260 | pseudos and long for the hard registers. | |
261 | ||
6fb5fa3c DB |
262 | ACCESSING INSNS: |
263 | ||
50e94c7e SB |
264 | 1) The df insn information is kept in an array of DF_INSN_INFO objects. |
265 | The array is indexed by insn uid, and every DF_REF points to the | |
266 | DF_INSN_INFO object of the insn that contains the reference. | |
267 | ||
268 | 2) Each insn has three sets of refs, which are linked into one of three | |
269 | lists: The insn's defs list (accessed by the DF_INSN_INFO_DEFS, | |
270 | DF_INSN_DEFS, or DF_INSN_UID_DEFS macros), the insn's uses list | |
271 | (accessed by the DF_INSN_INFO_USES, DF_INSN_USES, or | |
272 | DF_INSN_UID_USES macros) or the insn's eq_uses list (accessed by the | |
273 | DF_INSN_INFO_EQ_USES, DF_INSN_EQ_USES or DF_INSN_UID_EQ_USES macros). | |
274 | The latter list are the list of references in REG_EQUAL or REG_EQUIV | |
275 | notes. These macros produce a ref (or NULL), the rest of the list | |
276 | can be obtained by traversal of the NEXT_REF field (accessed by the | |
277 | DF_REF_NEXT_REF macro.) There is no significance to the ordering of | |
278 | the uses or refs in an instruction. | |
279 | ||
280 | 3) Each insn has a logical uid field (LUID) which is stored in the | |
281 | DF_INSN_INFO object for the insn. The LUID field is accessed by | |
282 | the DF_INSN_INFO_LUID, DF_INSN_LUID, and DF_INSN_UID_LUID macros. | |
283 | When properly set, the LUID is an integer that numbers each insn in | |
284 | the basic block, in order from the start of the block. | |
285 | The numbers are only correct after a call to df_analyze. They will | |
286 | rot after insns are added deleted or moved round. | |
6fb5fa3c | 287 | |
4d779342 DB |
288 | ACCESSING REFS: |
289 | ||
290 | There are 4 ways to obtain access to refs: | |
291 | ||
292 | 1) References are divided into two categories, REAL and ARTIFICIAL. | |
293 | ||
b8698a0f | 294 | REAL refs are associated with instructions. |
4d779342 DB |
295 | |
296 | ARTIFICIAL refs are associated with basic blocks. The heads of | |
6fb5fa3c | 297 | these lists can be accessed by calling df_get_artificial_defs or |
b8698a0f L |
298 | df_get_artificial_uses for the particular basic block. |
299 | ||
912f2dac DB |
300 | Artificial defs and uses occur both at the beginning and ends of blocks. |
301 | ||
302 | For blocks that area at the destination of eh edges, the | |
303 | artificial uses and defs occur at the beginning. The defs relate | |
304 | to the registers specified in EH_RETURN_DATA_REGNO and the uses | |
305 | relate to the registers specified in ED_USES. Logically these | |
306 | defs and uses should really occur along the eh edge, but there is | |
307 | no convenient way to do this. Artificial edges that occur at the | |
308 | beginning of the block have the DF_REF_AT_TOP flag set. | |
309 | ||
310 | Artificial uses occur at the end of all blocks. These arise from | |
311 | the hard registers that are always live, such as the stack | |
312 | register and are put there to keep the code from forgetting about | |
313 | them. | |
314 | ||
c0220ea4 | 315 | Artificial defs occur at the end of the entry block. These arise |
912f2dac | 316 | from registers that are live at entry to the function. |
4d779342 | 317 | |
b8698a0f | 318 | 2) There are three types of refs: defs, uses and eq_uses. (Eq_uses are |
6fb5fa3c | 319 | uses that appear inside a REG_EQUAL or REG_EQUIV note.) |
4d779342 | 320 | |
6fb5fa3c DB |
321 | All of the eq_uses, uses and defs associated with each pseudo or |
322 | hard register may be linked in a bidirectional chain. These are | |
323 | called reg-use or reg_def chains. If the changeable flag | |
324 | DF_EQ_NOTES is set when the chains are built, the eq_uses will be | |
b8698a0f | 325 | treated like uses. If it is not set they are ignored. |
6fb5fa3c DB |
326 | |
327 | The first use, eq_use or def for a register can be obtained using | |
328 | the DF_REG_USE_CHAIN, DF_REG_EQ_USE_CHAIN or DF_REG_DEF_CHAIN | |
329 | macros. Subsequent uses for the same regno can be obtained by | |
330 | following the next_reg field of the ref. The number of elements in | |
331 | each of the chains can be found by using the DF_REG_USE_COUNT, | |
332 | DF_REG_EQ_USE_COUNT or DF_REG_DEF_COUNT macros. | |
4d779342 DB |
333 | |
334 | In previous versions of this code, these chains were ordered. It | |
335 | has not been practical to continue this practice. | |
336 | ||
337 | 3) If def-use or use-def chains are built, these can be traversed to | |
6fb5fa3c DB |
338 | get to other refs. If the flag DF_EQ_NOTES has been set, the chains |
339 | include the eq_uses. Otherwise these are ignored when building the | |
340 | chains. | |
4d779342 DB |
341 | |
342 | 4) An array of all of the uses (and an array of all of the defs) can | |
343 | be built. These arrays are indexed by the value in the id | |
344 | structure. These arrays are only lazily kept up to date, and that | |
345 | process can be expensive. To have these arrays built, call | |
6fb5fa3c DB |
346 | df_reorganize_defs or df_reorganize_uses. If the flag DF_EQ_NOTES |
347 | has been set the array will contain the eq_uses. Otherwise these | |
348 | are ignored when building the array and assigning the ids. Note | |
349 | that the values in the id field of a ref may change across calls to | |
b8698a0f | 350 | df_analyze or df_reorganize_defs or df_reorganize_uses. |
4d779342 DB |
351 | |
352 | If the only use of this array is to find all of the refs, it is | |
353 | better to traverse all of the registers and then traverse all of | |
354 | reg-use or reg-def chains. | |
355 | ||
4d779342 | 356 | NOTES: |
b8698a0f | 357 | |
4d779342 DB |
358 | Embedded addressing side-effects, such as POST_INC or PRE_INC, generate |
359 | both a use and a def. These are both marked read/write to show that they | |
360 | are dependent. For example, (set (reg 40) (mem (post_inc (reg 42)))) | |
361 | will generate a use of reg 42 followed by a def of reg 42 (both marked | |
362 | read/write). Similarly, (set (reg 40) (mem (pre_dec (reg 41)))) | |
363 | generates a use of reg 41 then a def of reg 41 (both marked read/write), | |
364 | even though reg 41 is decremented before it is used for the memory | |
365 | address in this second example. | |
366 | ||
367 | A set to a REG inside a ZERO_EXTRACT, or a set to a non-paradoxical SUBREG | |
368 | for which the number of word_mode units covered by the outer mode is | |
fa10beec | 369 | smaller than that covered by the inner mode, invokes a read-modify-write |
4d779342 DB |
370 | operation. We generate both a use and a def and again mark them |
371 | read/write. | |
372 | ||
373 | Paradoxical subreg writes do not leave a trace of the old content, so they | |
b8698a0f | 374 | are write-only operations. |
4d779342 DB |
375 | */ |
376 | ||
377 | ||
378 | #include "config.h" | |
379 | #include "system.h" | |
380 | #include "coretypes.h" | |
381 | #include "tm.h" | |
382 | #include "rtl.h" | |
383 | #include "tm_p.h" | |
384 | #include "insn-config.h" | |
385 | #include "recog.h" | |
386 | #include "function.h" | |
387 | #include "regs.h" | |
4d779342 DB |
388 | #include "alloc-pool.h" |
389 | #include "flags.h" | |
390 | #include "hard-reg-set.h" | |
391 | #include "basic-block.h" | |
392 | #include "sbitmap.h" | |
393 | #include "bitmap.h" | |
394 | #include "timevar.h" | |
395 | #include "df.h" | |
396 | #include "tree-pass.h" | |
185082a7 | 397 | #include "params.h" |
4d779342 | 398 | |
23249ac4 | 399 | static void *df_get_bb_info (struct dataflow *, unsigned int); |
30cb87a0 | 400 | static void df_set_bb_info (struct dataflow *, unsigned int, void *); |
e285df08 | 401 | static void df_clear_bb_info (struct dataflow *, unsigned int); |
6fb5fa3c DB |
402 | #ifdef DF_DEBUG_CFG |
403 | static void df_set_clean_cfg (void); | |
404 | #endif | |
4d779342 | 405 | |
532aafad SB |
406 | /* The obstack on which regsets are allocated. */ |
407 | struct bitmap_obstack reg_obstack; | |
408 | ||
6fb5fa3c DB |
409 | /* An obstack for bitmap not related to specific dataflow problems. |
410 | This obstack should e.g. be used for bitmaps with a short life time | |
411 | such as temporary bitmaps. */ | |
4d779342 | 412 | |
6fb5fa3c | 413 | bitmap_obstack df_bitmap_obstack; |
4d779342 | 414 | |
4d779342 | 415 | |
6fb5fa3c DB |
416 | /*---------------------------------------------------------------------------- |
417 | Functions to create, destroy and manipulate an instance of df. | |
418 | ----------------------------------------------------------------------------*/ | |
419 | ||
f12c802a | 420 | struct df_d *df; |
4d779342 | 421 | |
6fb5fa3c | 422 | /* Add PROBLEM (and any dependent problems) to the DF instance. */ |
4d779342 | 423 | |
6fb5fa3c DB |
424 | void |
425 | df_add_problem (struct df_problem *problem) | |
4d779342 DB |
426 | { |
427 | struct dataflow *dflow; | |
6fb5fa3c | 428 | int i; |
4d779342 DB |
429 | |
430 | /* First try to add the dependent problem. */ | |
6fb5fa3c DB |
431 | if (problem->dependent_problem) |
432 | df_add_problem (problem->dependent_problem); | |
4d779342 DB |
433 | |
434 | /* Check to see if this problem has already been defined. If it | |
435 | has, just return that instance, if not, add it to the end of the | |
436 | vector. */ | |
437 | dflow = df->problems_by_index[problem->id]; | |
438 | if (dflow) | |
6fb5fa3c | 439 | return; |
4d779342 DB |
440 | |
441 | /* Make a new one and add it to the end. */ | |
5ed6ace5 | 442 | dflow = XCNEW (struct dataflow); |
4d779342 | 443 | dflow->problem = problem; |
6fb5fa3c DB |
444 | dflow->computed = false; |
445 | dflow->solutions_dirty = true; | |
4d779342 DB |
446 | df->problems_by_index[dflow->problem->id] = dflow; |
447 | ||
6fb5fa3c DB |
448 | /* Keep the defined problems ordered by index. This solves the |
449 | problem that RI will use the information from UREC if UREC has | |
450 | been defined, or from LIVE if LIVE is defined and otherwise LR. | |
451 | However for this to work, the computation of RI must be pushed | |
452 | after which ever of those problems is defined, but we do not | |
453 | require any of those except for LR to have actually been | |
b8698a0f | 454 | defined. */ |
6fb5fa3c DB |
455 | df->num_problems_defined++; |
456 | for (i = df->num_problems_defined - 2; i >= 0; i--) | |
457 | { | |
458 | if (problem->id < df->problems_in_order[i]->problem->id) | |
459 | df->problems_in_order[i+1] = df->problems_in_order[i]; | |
460 | else | |
461 | { | |
462 | df->problems_in_order[i+1] = dflow; | |
463 | return; | |
464 | } | |
465 | } | |
466 | df->problems_in_order[0] = dflow; | |
4d779342 DB |
467 | } |
468 | ||
469 | ||
23249ac4 DB |
470 | /* Set the MASK flags in the DFLOW problem. The old flags are |
471 | returned. If a flag is not allowed to be changed this will fail if | |
472 | checking is enabled. */ | |
81f40b79 | 473 | int |
bbbbb16a | 474 | df_set_flags (int changeable_flags) |
23249ac4 | 475 | { |
81f40b79 | 476 | int old_flags = df->changeable_flags; |
6fb5fa3c | 477 | df->changeable_flags |= changeable_flags; |
23249ac4 DB |
478 | return old_flags; |
479 | } | |
480 | ||
6fb5fa3c | 481 | |
23249ac4 DB |
482 | /* Clear the MASK flags in the DFLOW problem. The old flags are |
483 | returned. If a flag is not allowed to be changed this will fail if | |
484 | checking is enabled. */ | |
81f40b79 | 485 | int |
bbbbb16a | 486 | df_clear_flags (int changeable_flags) |
23249ac4 | 487 | { |
81f40b79 | 488 | int old_flags = df->changeable_flags; |
6fb5fa3c | 489 | df->changeable_flags &= ~changeable_flags; |
23249ac4 DB |
490 | return old_flags; |
491 | } | |
492 | ||
6fb5fa3c | 493 | |
4d779342 DB |
494 | /* Set the blocks that are to be considered for analysis. If this is |
495 | not called or is called with null, the entire function in | |
496 | analyzed. */ | |
497 | ||
b8698a0f | 498 | void |
6fb5fa3c | 499 | df_set_blocks (bitmap blocks) |
4d779342 DB |
500 | { |
501 | if (blocks) | |
502 | { | |
6fb5fa3c DB |
503 | if (dump_file) |
504 | bitmap_print (dump_file, blocks, "setting blocks to analyze ", "\n"); | |
3b8266e2 KZ |
505 | if (df->blocks_to_analyze) |
506 | { | |
89a95777 KZ |
507 | /* This block is called to change the focus from one subset |
508 | to another. */ | |
3b8266e2 | 509 | int p; |
a7e3698d JH |
510 | bitmap_head diff; |
511 | bitmap_initialize (&diff, &df_bitmap_obstack); | |
512 | bitmap_and_compl (&diff, df->blocks_to_analyze, blocks); | |
89a95777 | 513 | for (p = 0; p < df->num_problems_defined; p++) |
3b8266e2 KZ |
514 | { |
515 | struct dataflow *dflow = df->problems_in_order[p]; | |
89a95777 | 516 | if (dflow->optional_p && dflow->problem->reset_fun) |
6fb5fa3c | 517 | dflow->problem->reset_fun (df->blocks_to_analyze); |
89a95777 | 518 | else if (dflow->problem->free_blocks_on_set_blocks) |
3b8266e2 KZ |
519 | { |
520 | bitmap_iterator bi; | |
521 | unsigned int bb_index; | |
b8698a0f | 522 | |
a7e3698d | 523 | EXECUTE_IF_SET_IN_BITMAP (&diff, 0, bb_index, bi) |
3b8266e2 KZ |
524 | { |
525 | basic_block bb = BASIC_BLOCK (bb_index); | |
30cb87a0 KZ |
526 | if (bb) |
527 | { | |
6fb5fa3c | 528 | void *bb_info = df_get_bb_info (dflow, bb_index); |
e285df08 JH |
529 | dflow->problem->free_bb_fun (bb, bb_info); |
530 | df_clear_bb_info (dflow, bb_index); | |
30cb87a0 | 531 | } |
3b8266e2 KZ |
532 | } |
533 | } | |
534 | } | |
535 | ||
a7e3698d | 536 | bitmap_clear (&diff); |
3b8266e2 KZ |
537 | } |
538 | else | |
30cb87a0 | 539 | { |
89a95777 KZ |
540 | /* This block of code is executed to change the focus from |
541 | the entire function to a subset. */ | |
a7e3698d JH |
542 | bitmap_head blocks_to_reset; |
543 | bool initialized = false; | |
89a95777 KZ |
544 | int p; |
545 | for (p = 0; p < df->num_problems_defined; p++) | |
30cb87a0 | 546 | { |
89a95777 KZ |
547 | struct dataflow *dflow = df->problems_in_order[p]; |
548 | if (dflow->optional_p && dflow->problem->reset_fun) | |
30cb87a0 | 549 | { |
a7e3698d | 550 | if (!initialized) |
30cb87a0 | 551 | { |
89a95777 | 552 | basic_block bb; |
a7e3698d | 553 | bitmap_initialize (&blocks_to_reset, &df_bitmap_obstack); |
89a95777 | 554 | FOR_ALL_BB(bb) |
30cb87a0 | 555 | { |
a7e3698d | 556 | bitmap_set_bit (&blocks_to_reset, bb->index); |
30cb87a0 | 557 | } |
30cb87a0 | 558 | } |
a7e3698d | 559 | dflow->problem->reset_fun (&blocks_to_reset); |
30cb87a0 | 560 | } |
30cb87a0 | 561 | } |
a7e3698d JH |
562 | if (initialized) |
563 | bitmap_clear (&blocks_to_reset); | |
89a95777 | 564 | |
6fb5fa3c | 565 | df->blocks_to_analyze = BITMAP_ALLOC (&df_bitmap_obstack); |
30cb87a0 | 566 | } |
4d779342 | 567 | bitmap_copy (df->blocks_to_analyze, blocks); |
6fb5fa3c | 568 | df->analyze_subset = true; |
4d779342 DB |
569 | } |
570 | else | |
571 | { | |
89a95777 KZ |
572 | /* This block is executed to reset the focus to the entire |
573 | function. */ | |
6fb5fa3c | 574 | if (dump_file) |
89a95777 | 575 | fprintf (dump_file, "clearing blocks_to_analyze\n"); |
4d779342 DB |
576 | if (df->blocks_to_analyze) |
577 | { | |
578 | BITMAP_FREE (df->blocks_to_analyze); | |
579 | df->blocks_to_analyze = NULL; | |
580 | } | |
6fb5fa3c | 581 | df->analyze_subset = false; |
4d779342 | 582 | } |
6fb5fa3c DB |
583 | |
584 | /* Setting the blocks causes the refs to be unorganized since only | |
585 | the refs in the blocks are seen. */ | |
586 | df_maybe_reorganize_def_refs (DF_REF_ORDER_NO_TABLE); | |
587 | df_maybe_reorganize_use_refs (DF_REF_ORDER_NO_TABLE); | |
588 | df_mark_solutions_dirty (); | |
4d779342 DB |
589 | } |
590 | ||
591 | ||
6fb5fa3c DB |
592 | /* Delete a DFLOW problem (and any problems that depend on this |
593 | problem). */ | |
23249ac4 DB |
594 | |
595 | void | |
6fb5fa3c | 596 | df_remove_problem (struct dataflow *dflow) |
23249ac4 | 597 | { |
6fb5fa3c | 598 | struct df_problem *problem; |
23249ac4 | 599 | int i; |
6fb5fa3c DB |
600 | |
601 | if (!dflow) | |
602 | return; | |
603 | ||
604 | problem = dflow->problem; | |
605 | gcc_assert (problem->remove_problem_fun); | |
606 | ||
6fb5fa3c | 607 | /* Delete any problems that depended on this problem first. */ |
89a95777 | 608 | for (i = 0; i < df->num_problems_defined; i++) |
6fb5fa3c DB |
609 | if (df->problems_in_order[i]->problem->dependent_problem == problem) |
610 | df_remove_problem (df->problems_in_order[i]); | |
611 | ||
612 | /* Now remove this problem. */ | |
89a95777 | 613 | for (i = 0; i < df->num_problems_defined; i++) |
6fb5fa3c DB |
614 | if (df->problems_in_order[i] == dflow) |
615 | { | |
616 | int j; | |
617 | for (j = i + 1; j < df->num_problems_defined; j++) | |
618 | df->problems_in_order[j-1] = df->problems_in_order[j]; | |
7039a415 | 619 | df->problems_in_order[j-1] = NULL; |
6fb5fa3c DB |
620 | df->num_problems_defined--; |
621 | break; | |
622 | } | |
623 | ||
624 | (problem->remove_problem_fun) (); | |
625 | df->problems_by_index[problem->id] = NULL; | |
626 | } | |
627 | ||
628 | ||
05c219bb PB |
629 | /* Remove all of the problems that are not permanent. Scanning, LR |
630 | and (at -O2 or higher) LIVE are permanent, the rest are removable. | |
631 | Also clear all of the changeable_flags. */ | |
6fb5fa3c DB |
632 | |
633 | void | |
0d475361 | 634 | df_finish_pass (bool verify ATTRIBUTE_UNUSED) |
6fb5fa3c DB |
635 | { |
636 | int i; | |
637 | int removed = 0; | |
638 | ||
3089f8b5 | 639 | #ifdef ENABLE_DF_CHECKING |
a46edbff | 640 | int saved_flags; |
6fb5fa3c DB |
641 | #endif |
642 | ||
643 | if (!df) | |
644 | return; | |
645 | ||
646 | df_maybe_reorganize_def_refs (DF_REF_ORDER_NO_TABLE); | |
647 | df_maybe_reorganize_use_refs (DF_REF_ORDER_NO_TABLE); | |
648 | ||
3089f8b5 | 649 | #ifdef ENABLE_DF_CHECKING |
6fb5fa3c DB |
650 | saved_flags = df->changeable_flags; |
651 | #endif | |
652 | ||
89a95777 | 653 | for (i = 0; i < df->num_problems_defined; i++) |
23249ac4 DB |
654 | { |
655 | struct dataflow *dflow = df->problems_in_order[i]; | |
6fb5fa3c DB |
656 | struct df_problem *problem = dflow->problem; |
657 | ||
89a95777 KZ |
658 | if (dflow->optional_p) |
659 | { | |
660 | gcc_assert (problem->remove_problem_fun); | |
661 | (problem->remove_problem_fun) (); | |
662 | df->problems_in_order[i] = NULL; | |
663 | df->problems_by_index[problem->id] = NULL; | |
664 | removed++; | |
665 | } | |
6fb5fa3c DB |
666 | } |
667 | df->num_problems_defined -= removed; | |
668 | ||
669 | /* Clear all of the flags. */ | |
670 | df->changeable_flags = 0; | |
671 | df_process_deferred_rescans (); | |
672 | ||
673 | /* Set the focus back to the whole function. */ | |
674 | if (df->blocks_to_analyze) | |
675 | { | |
676 | BITMAP_FREE (df->blocks_to_analyze); | |
677 | df->blocks_to_analyze = NULL; | |
678 | df_mark_solutions_dirty (); | |
679 | df->analyze_subset = false; | |
23249ac4 | 680 | } |
6fb5fa3c | 681 | |
3089f8b5 | 682 | #ifdef ENABLE_DF_CHECKING |
6fb5fa3c DB |
683 | /* Verification will fail in DF_NO_INSN_RESCAN. */ |
684 | if (!(saved_flags & DF_NO_INSN_RESCAN)) | |
685 | { | |
686 | df_lr_verify_transfer_functions (); | |
687 | if (df_live) | |
688 | df_live_verify_transfer_functions (); | |
689 | } | |
690 | ||
691 | #ifdef DF_DEBUG_CFG | |
692 | df_set_clean_cfg (); | |
693 | #endif | |
694 | #endif | |
0d475361 PB |
695 | |
696 | #ifdef ENABLE_CHECKING | |
697 | if (verify) | |
698 | df->changeable_flags |= DF_VERIFY_SCHEDULED; | |
699 | #endif | |
6fb5fa3c DB |
700 | } |
701 | ||
702 | ||
703 | /* Set up the dataflow instance for the entire back end. */ | |
704 | ||
705 | static unsigned int | |
706 | rest_of_handle_df_initialize (void) | |
707 | { | |
708 | gcc_assert (!df); | |
f12c802a | 709 | df = XCNEW (struct df_d); |
6fb5fa3c DB |
710 | df->changeable_flags = 0; |
711 | ||
712 | bitmap_obstack_initialize (&df_bitmap_obstack); | |
713 | ||
714 | /* Set this to a conservative value. Stack_ptr_mod will compute it | |
715 | correctly later. */ | |
416ff32e | 716 | crtl->sp_is_unchanging = 0; |
6fb5fa3c DB |
717 | |
718 | df_scan_add_problem (); | |
719 | df_scan_alloc (NULL); | |
720 | ||
721 | /* These three problems are permanent. */ | |
722 | df_lr_add_problem (); | |
89a95777 | 723 | if (optimize > 1) |
6fb5fa3c DB |
724 | df_live_add_problem (); |
725 | ||
726 | df->postorder = XNEWVEC (int, last_basic_block); | |
727 | df->postorder_inverted = XNEWVEC (int, last_basic_block); | |
728 | df->n_blocks = post_order_compute (df->postorder, true, true); | |
729 | df->n_blocks_inverted = inverted_post_order_compute (df->postorder_inverted); | |
730 | gcc_assert (df->n_blocks == df->n_blocks_inverted); | |
731 | ||
732 | df->hard_regs_live_count = XNEWVEC (unsigned int, FIRST_PSEUDO_REGISTER); | |
b8698a0f | 733 | memset (df->hard_regs_live_count, 0, |
6fb5fa3c DB |
734 | sizeof (unsigned int) * FIRST_PSEUDO_REGISTER); |
735 | ||
736 | df_hard_reg_init (); | |
737 | /* After reload, some ports add certain bits to regs_ever_live so | |
738 | this cannot be reset. */ | |
739 | df_compute_regs_ever_live (true); | |
740 | df_scan_blocks (); | |
741 | df_compute_regs_ever_live (false); | |
742 | return 0; | |
743 | } | |
744 | ||
745 | ||
746 | static bool | |
747 | gate_opt (void) | |
748 | { | |
749 | return optimize > 0; | |
23249ac4 DB |
750 | } |
751 | ||
752 | ||
8ddbbcae | 753 | struct rtl_opt_pass pass_df_initialize_opt = |
6fb5fa3c | 754 | { |
8ddbbcae JH |
755 | { |
756 | RTL_PASS, | |
6fb5fa3c DB |
757 | "dfinit", /* name */ |
758 | gate_opt, /* gate */ | |
759 | rest_of_handle_df_initialize, /* execute */ | |
760 | NULL, /* sub */ | |
761 | NULL, /* next */ | |
762 | 0, /* static_pass_number */ | |
a222c01a | 763 | TV_DF_SCAN, /* tv_id */ |
6fb5fa3c DB |
764 | 0, /* properties_required */ |
765 | 0, /* properties_provided */ | |
766 | 0, /* properties_destroyed */ | |
767 | 0, /* todo_flags_start */ | |
8ddbbcae JH |
768 | 0 /* todo_flags_finish */ |
769 | } | |
6fb5fa3c DB |
770 | }; |
771 | ||
772 | ||
773 | static bool | |
774 | gate_no_opt (void) | |
775 | { | |
776 | return optimize == 0; | |
777 | } | |
778 | ||
779 | ||
8ddbbcae | 780 | struct rtl_opt_pass pass_df_initialize_no_opt = |
6fb5fa3c | 781 | { |
8ddbbcae JH |
782 | { |
783 | RTL_PASS, | |
e0a42b0f | 784 | "no-opt dfinit", /* name */ |
6fb5fa3c DB |
785 | gate_no_opt, /* gate */ |
786 | rest_of_handle_df_initialize, /* execute */ | |
787 | NULL, /* sub */ | |
788 | NULL, /* next */ | |
789 | 0, /* static_pass_number */ | |
a222c01a | 790 | TV_DF_SCAN, /* tv_id */ |
6fb5fa3c DB |
791 | 0, /* properties_required */ |
792 | 0, /* properties_provided */ | |
793 | 0, /* properties_destroyed */ | |
794 | 0, /* todo_flags_start */ | |
8ddbbcae JH |
795 | 0 /* todo_flags_finish */ |
796 | } | |
6fb5fa3c DB |
797 | }; |
798 | ||
799 | ||
4d779342 DB |
800 | /* Free all the dataflow info and the DF structure. This should be |
801 | called from the df_finish macro which also NULLs the parm. */ | |
802 | ||
6fb5fa3c DB |
803 | static unsigned int |
804 | rest_of_handle_df_finish (void) | |
4d779342 DB |
805 | { |
806 | int i; | |
807 | ||
6fb5fa3c DB |
808 | gcc_assert (df); |
809 | ||
4d779342 | 810 | for (i = 0; i < df->num_problems_defined; i++) |
6fb5fa3c DB |
811 | { |
812 | struct dataflow *dflow = df->problems_in_order[i]; | |
b8698a0f | 813 | dflow->problem->free_fun (); |
6fb5fa3c | 814 | } |
4d779342 | 815 | |
04695783 JM |
816 | free (df->postorder); |
817 | free (df->postorder_inverted); | |
6fb5fa3c | 818 | free (df->hard_regs_live_count); |
4d779342 | 819 | free (df); |
6fb5fa3c DB |
820 | df = NULL; |
821 | ||
822 | bitmap_obstack_release (&df_bitmap_obstack); | |
823 | return 0; | |
4d779342 DB |
824 | } |
825 | ||
6fb5fa3c | 826 | |
8ddbbcae | 827 | struct rtl_opt_pass pass_df_finish = |
6fb5fa3c | 828 | { |
8ddbbcae JH |
829 | { |
830 | RTL_PASS, | |
6fb5fa3c DB |
831 | "dfinish", /* name */ |
832 | NULL, /* gate */ | |
833 | rest_of_handle_df_finish, /* execute */ | |
834 | NULL, /* sub */ | |
835 | NULL, /* next */ | |
836 | 0, /* static_pass_number */ | |
7072a650 | 837 | TV_NONE, /* tv_id */ |
6fb5fa3c DB |
838 | 0, /* properties_required */ |
839 | 0, /* properties_provided */ | |
840 | 0, /* properties_destroyed */ | |
841 | 0, /* todo_flags_start */ | |
8ddbbcae JH |
842 | 0 /* todo_flags_finish */ |
843 | } | |
6fb5fa3c DB |
844 | }; |
845 | ||
846 | ||
847 | ||
848 | ||
4d779342 DB |
849 | \f |
850 | /*---------------------------------------------------------------------------- | |
851 | The general data flow analysis engine. | |
852 | ----------------------------------------------------------------------------*/ | |
853 | ||
50b2e859 JH |
854 | /* Return time BB when it was visited for last time. */ |
855 | #define BB_LAST_CHANGE_AGE(bb) ((ptrdiff_t)(bb)->aux) | |
4d779342 | 856 | |
6fb5fa3c | 857 | /* Helper function for df_worklist_dataflow. |
b8698a0f | 858 | Propagate the dataflow forward. |
6fb5fa3c DB |
859 | Given a BB_INDEX, do the dataflow propagation |
860 | and set bits on for successors in PENDING | |
50b2e859 JH |
861 | if the out set of the dataflow has changed. |
862 | ||
863 | AGE specify time when BB was visited last time. | |
864 | AGE of 0 means we are visiting for first time and need to | |
865 | compute transfer function to initialize datastructures. | |
866 | Otherwise we re-do transfer function only if something change | |
867 | while computing confluence functions. | |
868 | We need to compute confluence only of basic block that are younger | |
869 | then last visit of the BB. | |
870 | ||
871 | Return true if BB info has changed. This is always the case | |
872 | in the first visit. */ | |
4d779342 | 873 | |
1a0f3fa1 | 874 | static bool |
6fb5fa3c DB |
875 | df_worklist_propagate_forward (struct dataflow *dataflow, |
876 | unsigned bb_index, | |
877 | unsigned *bbindex_to_postorder, | |
878 | bitmap pending, | |
1a0f3fa1 | 879 | sbitmap considered, |
50b2e859 | 880 | ptrdiff_t age) |
4d779342 | 881 | { |
4d779342 DB |
882 | edge e; |
883 | edge_iterator ei; | |
6fb5fa3c | 884 | basic_block bb = BASIC_BLOCK (bb_index); |
1a0f3fa1 | 885 | bool changed = !age; |
4d779342 | 886 | |
6fb5fa3c | 887 | /* Calculate <conf_op> of incoming edges. */ |
4d779342 DB |
888 | if (EDGE_COUNT (bb->preds) > 0) |
889 | FOR_EACH_EDGE (e, ei, bb->preds) | |
b8698a0f | 890 | { |
50b2e859 JH |
891 | if (age <= BB_LAST_CHANGE_AGE (e->src) |
892 | && TEST_BIT (considered, e->src->index)) | |
1a0f3fa1 | 893 | changed |= dataflow->problem->con_fun_n (e); |
b8698a0f | 894 | } |
e45dcf9c | 895 | else if (dataflow->problem->con_fun_0) |
50b2e859 | 896 | dataflow->problem->con_fun_0 (bb); |
6fb5fa3c | 897 | |
1a0f3fa1 JH |
898 | if (changed |
899 | && dataflow->problem->trans_fun (bb_index)) | |
4d779342 | 900 | { |
b8698a0f | 901 | /* The out set of this block has changed. |
6fb5fa3c DB |
902 | Propagate to the outgoing blocks. */ |
903 | FOR_EACH_EDGE (e, ei, bb->succs) | |
904 | { | |
905 | unsigned ob_index = e->dest->index; | |
906 | ||
907 | if (TEST_BIT (considered, ob_index)) | |
908 | bitmap_set_bit (pending, bbindex_to_postorder[ob_index]); | |
909 | } | |
1a0f3fa1 | 910 | return true; |
4d779342 | 911 | } |
1a0f3fa1 | 912 | return false; |
4d779342 DB |
913 | } |
914 | ||
6fb5fa3c DB |
915 | |
916 | /* Helper function for df_worklist_dataflow. | |
917 | Propagate the dataflow backward. */ | |
918 | ||
1a0f3fa1 | 919 | static bool |
6fb5fa3c DB |
920 | df_worklist_propagate_backward (struct dataflow *dataflow, |
921 | unsigned bb_index, | |
922 | unsigned *bbindex_to_postorder, | |
923 | bitmap pending, | |
1a0f3fa1 | 924 | sbitmap considered, |
50b2e859 | 925 | ptrdiff_t age) |
4d779342 | 926 | { |
4d779342 DB |
927 | edge e; |
928 | edge_iterator ei; | |
6fb5fa3c | 929 | basic_block bb = BASIC_BLOCK (bb_index); |
1a0f3fa1 | 930 | bool changed = !age; |
4d779342 | 931 | |
6fb5fa3c | 932 | /* Calculate <conf_op> of incoming edges. */ |
4d779342 | 933 | if (EDGE_COUNT (bb->succs) > 0) |
6fb5fa3c | 934 | FOR_EACH_EDGE (e, ei, bb->succs) |
b8698a0f | 935 | { |
50b2e859 JH |
936 | if (age <= BB_LAST_CHANGE_AGE (e->dest) |
937 | && TEST_BIT (considered, e->dest->index)) | |
1a0f3fa1 | 938 | changed |= dataflow->problem->con_fun_n (e); |
b8698a0f | 939 | } |
e45dcf9c | 940 | else if (dataflow->problem->con_fun_0) |
50b2e859 | 941 | dataflow->problem->con_fun_0 (bb); |
4d779342 | 942 | |
1a0f3fa1 JH |
943 | if (changed |
944 | && dataflow->problem->trans_fun (bb_index)) | |
4d779342 | 945 | { |
b8698a0f | 946 | /* The out set of this block has changed. |
6fb5fa3c DB |
947 | Propagate to the outgoing blocks. */ |
948 | FOR_EACH_EDGE (e, ei, bb->preds) | |
949 | { | |
950 | unsigned ob_index = e->src->index; | |
951 | ||
952 | if (TEST_BIT (considered, ob_index)) | |
953 | bitmap_set_bit (pending, bbindex_to_postorder[ob_index]); | |
954 | } | |
1a0f3fa1 | 955 | return true; |
4d779342 | 956 | } |
1a0f3fa1 | 957 | return false; |
4d779342 DB |
958 | } |
959 | ||
50b2e859 JH |
960 | /* Main dataflow solver loop. |
961 | ||
962 | DATAFLOW is problem we are solving, PENDING is worklist of basic blocks we | |
963 | need to visit. | |
964 | BLOCK_IN_POSTORDER is array of size N_BLOCKS specifying postorder in BBs and | |
965 | BBINDEX_TO_POSTORDER is array mapping back BB->index to postorder possition. | |
966 | PENDING will be freed. | |
967 | ||
968 | The worklists are bitmaps indexed by postorder positions. | |
969 | ||
970 | The function implements standard algorithm for dataflow solving with two | |
971 | worklists (we are processing WORKLIST and storing new BBs to visit in | |
972 | PENDING). | |
185082a7 | 973 | |
50b2e859 JH |
974 | As an optimization we maintain ages when BB was changed (stored in bb->aux) |
975 | and when it was last visited (stored in last_visit_age). This avoids need | |
976 | to re-do confluence function for edges to basic blocks whose source | |
977 | did not change since destination was visited last time. */ | |
185082a7 | 978 | |
b8698a0f | 979 | static void |
185082a7 SP |
980 | df_worklist_dataflow_doublequeue (struct dataflow *dataflow, |
981 | bitmap pending, | |
982 | sbitmap considered, | |
983 | int *blocks_in_postorder, | |
1a0f3fa1 JH |
984 | unsigned *bbindex_to_postorder, |
985 | int n_blocks) | |
185082a7 SP |
986 | { |
987 | enum df_flow_dir dir = dataflow->problem->dir; | |
988 | int dcount = 0; | |
989 | bitmap worklist = BITMAP_ALLOC (&df_bitmap_obstack); | |
50b2e859 | 990 | int age = 0; |
1a0f3fa1 | 991 | bool changed; |
50b2e859 JH |
992 | VEC(int, heap) *last_visit_age = NULL; |
993 | int prev_age; | |
1a0f3fa1 JH |
994 | basic_block bb; |
995 | int i; | |
996 | ||
50b2e859 | 997 | VEC_safe_grow_cleared (int, heap, last_visit_age, n_blocks); |
185082a7 SP |
998 | |
999 | /* Double-queueing. Worklist is for the current iteration, | |
1000 | and pending is for the next. */ | |
1001 | while (!bitmap_empty_p (pending)) | |
1002 | { | |
1a0f3fa1 JH |
1003 | bitmap_iterator bi; |
1004 | unsigned int index; | |
1005 | ||
185082a7 SP |
1006 | /* Swap pending and worklist. */ |
1007 | bitmap temp = worklist; | |
1008 | worklist = pending; | |
1009 | pending = temp; | |
1010 | ||
1a0f3fa1 | 1011 | EXECUTE_IF_SET_IN_BITMAP (worklist, 0, index, bi) |
185082a7 | 1012 | { |
185082a7 SP |
1013 | unsigned bb_index; |
1014 | dcount++; | |
1015 | ||
50b2e859 | 1016 | bitmap_clear_bit (pending, index); |
185082a7 | 1017 | bb_index = blocks_in_postorder[index]; |
1a0f3fa1 | 1018 | bb = BASIC_BLOCK (bb_index); |
50b2e859 | 1019 | prev_age = VEC_index (int, last_visit_age, index); |
185082a7 | 1020 | if (dir == DF_FORWARD) |
1a0f3fa1 JH |
1021 | changed = df_worklist_propagate_forward (dataflow, bb_index, |
1022 | bbindex_to_postorder, | |
1023 | pending, considered, | |
1024 | prev_age); | |
b8698a0f | 1025 | else |
1a0f3fa1 JH |
1026 | changed = df_worklist_propagate_backward (dataflow, bb_index, |
1027 | bbindex_to_postorder, | |
1028 | pending, considered, | |
1029 | prev_age); | |
50b2e859 | 1030 | VEC_replace (int, last_visit_age, index, ++age); |
1a0f3fa1 | 1031 | if (changed) |
50b2e859 | 1032 | bb->aux = (void *)(ptrdiff_t)age; |
185082a7 | 1033 | } |
1a0f3fa1 | 1034 | bitmap_clear (worklist); |
185082a7 | 1035 | } |
1a0f3fa1 JH |
1036 | for (i = 0; i < n_blocks; i++) |
1037 | BASIC_BLOCK (blocks_in_postorder[i])->aux = NULL; | |
185082a7 SP |
1038 | |
1039 | BITMAP_FREE (worklist); | |
1040 | BITMAP_FREE (pending); | |
50b2e859 | 1041 | VEC_free (int, heap, last_visit_age); |
185082a7 SP |
1042 | |
1043 | /* Dump statistics. */ | |
1044 | if (dump_file) | |
1045 | fprintf (dump_file, "df_worklist_dataflow_doublequeue:" | |
1046 | "n_basic_blocks %d n_edges %d" | |
1047 | " count %d (%5.2g)\n", | |
1048 | n_basic_blocks, n_edges, | |
1049 | dcount, dcount / (float)n_basic_blocks); | |
1050 | } | |
1051 | ||
6fb5fa3c | 1052 | /* Worklist-based dataflow solver. It uses sbitmap as a worklist, |
b8698a0f | 1053 | with "n"-th bit representing the n-th block in the reverse-postorder order. |
240b5cea SB |
1054 | The solver is a double-queue algorithm similar to the "double stack" solver |
1055 | from Cooper, Harvey and Kennedy, "Iterative data-flow analysis, Revisited". | |
1056 | The only significant difference is that the worklist in this implementation | |
1057 | is always sorted in RPO of the CFG visiting direction. */ | |
4d779342 | 1058 | |
b8698a0f | 1059 | void |
6fb5fa3c DB |
1060 | df_worklist_dataflow (struct dataflow *dataflow, |
1061 | bitmap blocks_to_consider, | |
1062 | int *blocks_in_postorder, | |
1063 | int n_blocks) | |
4d779342 | 1064 | { |
6fb5fa3c | 1065 | bitmap pending = BITMAP_ALLOC (&df_bitmap_obstack); |
4d779342 DB |
1066 | sbitmap considered = sbitmap_alloc (last_basic_block); |
1067 | bitmap_iterator bi; | |
6fb5fa3c DB |
1068 | unsigned int *bbindex_to_postorder; |
1069 | int i; | |
1070 | unsigned int index; | |
1071 | enum df_flow_dir dir = dataflow->problem->dir; | |
4d779342 | 1072 | |
6fb5fa3c | 1073 | gcc_assert (dir != DF_NONE); |
4d779342 | 1074 | |
6fb5fa3c DB |
1075 | /* BBINDEX_TO_POSTORDER maps the bb->index to the reverse postorder. */ |
1076 | bbindex_to_postorder = | |
1077 | (unsigned int *)xmalloc (last_basic_block * sizeof (unsigned int)); | |
4d779342 | 1078 | |
6fb5fa3c DB |
1079 | /* Initialize the array to an out-of-bound value. */ |
1080 | for (i = 0; i < last_basic_block; i++) | |
1081 | bbindex_to_postorder[i] = last_basic_block; | |
23249ac4 | 1082 | |
6fb5fa3c DB |
1083 | /* Initialize the considered map. */ |
1084 | sbitmap_zero (considered); | |
1085 | EXECUTE_IF_SET_IN_BITMAP (blocks_to_consider, 0, index, bi) | |
4d779342 | 1086 | { |
6fb5fa3c | 1087 | SET_BIT (considered, index); |
4d779342 DB |
1088 | } |
1089 | ||
6fb5fa3c | 1090 | /* Initialize the mapping of block index to postorder. */ |
4d779342 DB |
1091 | for (i = 0; i < n_blocks; i++) |
1092 | { | |
6fb5fa3c DB |
1093 | bbindex_to_postorder[blocks_in_postorder[i]] = i; |
1094 | /* Add all blocks to the worklist. */ | |
1095 | bitmap_set_bit (pending, i); | |
1096 | } | |
4d779342 | 1097 | |
185082a7 | 1098 | /* Initialize the problem. */ |
6fb5fa3c DB |
1099 | if (dataflow->problem->init_fun) |
1100 | dataflow->problem->init_fun (blocks_to_consider); | |
4d779342 | 1101 | |
240b5cea SB |
1102 | /* Solve it. */ |
1103 | df_worklist_dataflow_doublequeue (dataflow, pending, considered, | |
1104 | blocks_in_postorder, | |
1a0f3fa1 JH |
1105 | bbindex_to_postorder, |
1106 | n_blocks); | |
4d779342 | 1107 | sbitmap_free (considered); |
6fb5fa3c | 1108 | free (bbindex_to_postorder); |
4d779342 DB |
1109 | } |
1110 | ||
1111 | ||
1112 | /* Remove the entries not in BLOCKS from the LIST of length LEN, preserving | |
1113 | the order of the remaining entries. Returns the length of the resulting | |
1114 | list. */ | |
1115 | ||
1116 | static unsigned | |
1117 | df_prune_to_subcfg (int list[], unsigned len, bitmap blocks) | |
1118 | { | |
1119 | unsigned act, last; | |
1120 | ||
1121 | for (act = 0, last = 0; act < len; act++) | |
1122 | if (bitmap_bit_p (blocks, list[act])) | |
1123 | list[last++] = list[act]; | |
1124 | ||
1125 | return last; | |
1126 | } | |
1127 | ||
1128 | ||
b8698a0f | 1129 | /* Execute dataflow analysis on a single dataflow problem. |
4d779342 | 1130 | |
4d779342 DB |
1131 | BLOCKS_TO_CONSIDER are the blocks whose solution can either be |
1132 | examined or will be computed. For calls from DF_ANALYZE, this is | |
b8698a0f | 1133 | the set of blocks that has been passed to DF_SET_BLOCKS. |
4d779342 DB |
1134 | */ |
1135 | ||
23249ac4 | 1136 | void |
b8698a0f L |
1137 | df_analyze_problem (struct dataflow *dflow, |
1138 | bitmap blocks_to_consider, | |
6fb5fa3c | 1139 | int *postorder, int n_blocks) |
4d779342 | 1140 | { |
6fb5fa3c DB |
1141 | timevar_push (dflow->problem->tv_id); |
1142 | ||
e7f96023 JH |
1143 | /* (Re)Allocate the datastructures necessary to solve the problem. */ |
1144 | if (dflow->problem->alloc_fun) | |
1145 | dflow->problem->alloc_fun (blocks_to_consider); | |
1146 | ||
3089f8b5 | 1147 | #ifdef ENABLE_DF_CHECKING |
6fb5fa3c DB |
1148 | if (dflow->problem->verify_start_fun) |
1149 | dflow->problem->verify_start_fun (); | |
1150 | #endif | |
1151 | ||
6fb5fa3c | 1152 | /* Set up the problem and compute the local information. */ |
e45dcf9c | 1153 | if (dflow->problem->local_compute_fun) |
6fb5fa3c | 1154 | dflow->problem->local_compute_fun (blocks_to_consider); |
4d779342 DB |
1155 | |
1156 | /* Solve the equations. */ | |
e45dcf9c | 1157 | if (dflow->problem->dataflow_fun) |
6fb5fa3c DB |
1158 | dflow->problem->dataflow_fun (dflow, blocks_to_consider, |
1159 | postorder, n_blocks); | |
4d779342 DB |
1160 | |
1161 | /* Massage the solution. */ | |
e45dcf9c | 1162 | if (dflow->problem->finalize_fun) |
6fb5fa3c DB |
1163 | dflow->problem->finalize_fun (blocks_to_consider); |
1164 | ||
3089f8b5 | 1165 | #ifdef ENABLE_DF_CHECKING |
6fb5fa3c DB |
1166 | if (dflow->problem->verify_end_fun) |
1167 | dflow->problem->verify_end_fun (); | |
1168 | #endif | |
1169 | ||
1170 | timevar_pop (dflow->problem->tv_id); | |
1171 | ||
1172 | dflow->computed = true; | |
4d779342 DB |
1173 | } |
1174 | ||
1175 | ||
1176 | /* Analyze dataflow info for the basic blocks specified by the bitmap | |
1177 | BLOCKS, or for the whole CFG if BLOCKS is zero. */ | |
1178 | ||
1179 | void | |
6fb5fa3c | 1180 | df_analyze (void) |
4d779342 | 1181 | { |
6fb5fa3c | 1182 | bitmap current_all_blocks = BITMAP_ALLOC (&df_bitmap_obstack); |
4d779342 | 1183 | bool everything; |
6fb5fa3c | 1184 | int i; |
b8698a0f | 1185 | |
04695783 JM |
1186 | free (df->postorder); |
1187 | free (df->postorder_inverted); | |
6fb5fa3c DB |
1188 | df->postorder = XNEWVEC (int, last_basic_block); |
1189 | df->postorder_inverted = XNEWVEC (int, last_basic_block); | |
1190 | df->n_blocks = post_order_compute (df->postorder, true, true); | |
1191 | df->n_blocks_inverted = inverted_post_order_compute (df->postorder_inverted); | |
1192 | ||
1193 | /* These should be the same. */ | |
1194 | gcc_assert (df->n_blocks == df->n_blocks_inverted); | |
1195 | ||
1196 | /* We need to do this before the df_verify_all because this is | |
1197 | not kept incrementally up to date. */ | |
1198 | df_compute_regs_ever_live (false); | |
1199 | df_process_deferred_rescans (); | |
1200 | ||
6fb5fa3c DB |
1201 | if (dump_file) |
1202 | fprintf (dump_file, "df_analyze called\n"); | |
3089f8b5 | 1203 | |
0d475361 PB |
1204 | #ifndef ENABLE_DF_CHECKING |
1205 | if (df->changeable_flags & DF_VERIFY_SCHEDULED) | |
1206 | #endif | |
1207 | df_verify (); | |
6fb5fa3c DB |
1208 | |
1209 | for (i = 0; i < df->n_blocks; i++) | |
1210 | bitmap_set_bit (current_all_blocks, df->postorder[i]); | |
1211 | ||
1212 | #ifdef ENABLE_CHECKING | |
1213 | /* Verify that POSTORDER_INVERTED only contains blocks reachable from | |
1214 | the ENTRY block. */ | |
1215 | for (i = 0; i < df->n_blocks_inverted; i++) | |
1216 | gcc_assert (bitmap_bit_p (current_all_blocks, df->postorder_inverted[i])); | |
1217 | #endif | |
4d779342 DB |
1218 | |
1219 | /* Make sure that we have pruned any unreachable blocks from these | |
1220 | sets. */ | |
6fb5fa3c | 1221 | if (df->analyze_subset) |
4d779342 DB |
1222 | { |
1223 | everything = false; | |
1224 | bitmap_and_into (df->blocks_to_analyze, current_all_blocks); | |
b8698a0f | 1225 | df->n_blocks = df_prune_to_subcfg (df->postorder, |
6fb5fa3c | 1226 | df->n_blocks, df->blocks_to_analyze); |
b8698a0f L |
1227 | df->n_blocks_inverted = df_prune_to_subcfg (df->postorder_inverted, |
1228 | df->n_blocks_inverted, | |
6fb5fa3c | 1229 | df->blocks_to_analyze); |
4d779342 DB |
1230 | BITMAP_FREE (current_all_blocks); |
1231 | } | |
1232 | else | |
1233 | { | |
1234 | everything = true; | |
1235 | df->blocks_to_analyze = current_all_blocks; | |
1236 | current_all_blocks = NULL; | |
1237 | } | |
1238 | ||
1239 | /* Skip over the DF_SCAN problem. */ | |
1240 | for (i = 1; i < df->num_problems_defined; i++) | |
6fb5fa3c DB |
1241 | { |
1242 | struct dataflow *dflow = df->problems_in_order[i]; | |
1243 | if (dflow->solutions_dirty) | |
1244 | { | |
1245 | if (dflow->problem->dir == DF_FORWARD) | |
1246 | df_analyze_problem (dflow, | |
1247 | df->blocks_to_analyze, | |
1248 | df->postorder_inverted, | |
1249 | df->n_blocks_inverted); | |
1250 | else | |
1251 | df_analyze_problem (dflow, | |
1252 | df->blocks_to_analyze, | |
1253 | df->postorder, | |
1254 | df->n_blocks); | |
1255 | } | |
1256 | } | |
4d779342 DB |
1257 | |
1258 | if (everything) | |
1259 | { | |
1260 | BITMAP_FREE (df->blocks_to_analyze); | |
1261 | df->blocks_to_analyze = NULL; | |
1262 | } | |
1263 | ||
6fb5fa3c DB |
1264 | #ifdef DF_DEBUG_CFG |
1265 | df_set_clean_cfg (); | |
1266 | #endif | |
1267 | } | |
1268 | ||
1269 | ||
1270 | /* Return the number of basic blocks from the last call to df_analyze. */ | |
1271 | ||
b8698a0f | 1272 | int |
6fb5fa3c DB |
1273 | df_get_n_blocks (enum df_flow_dir dir) |
1274 | { | |
1275 | gcc_assert (dir != DF_NONE); | |
1276 | ||
1277 | if (dir == DF_FORWARD) | |
1278 | { | |
1279 | gcc_assert (df->postorder_inverted); | |
1280 | return df->n_blocks_inverted; | |
1281 | } | |
1282 | ||
1283 | gcc_assert (df->postorder); | |
1284 | return df->n_blocks; | |
1285 | } | |
1286 | ||
1287 | ||
b8698a0f | 1288 | /* Return a pointer to the array of basic blocks in the reverse postorder. |
6fb5fa3c DB |
1289 | Depending on the direction of the dataflow problem, |
1290 | it returns either the usual reverse postorder array | |
1291 | or the reverse postorder of inverted traversal. */ | |
1292 | int * | |
1293 | df_get_postorder (enum df_flow_dir dir) | |
1294 | { | |
1295 | gcc_assert (dir != DF_NONE); | |
1296 | ||
1297 | if (dir == DF_FORWARD) | |
1298 | { | |
1299 | gcc_assert (df->postorder_inverted); | |
1300 | return df->postorder_inverted; | |
1301 | } | |
1302 | gcc_assert (df->postorder); | |
1303 | return df->postorder; | |
4d779342 DB |
1304 | } |
1305 | ||
b8698a0f | 1306 | static struct df_problem user_problem; |
6fb5fa3c | 1307 | static struct dataflow user_dflow; |
4d779342 | 1308 | |
6fb5fa3c DB |
1309 | /* Interface for calling iterative dataflow with user defined |
1310 | confluence and transfer functions. All that is necessary is to | |
1311 | supply DIR, a direction, CONF_FUN_0, a confluence function for | |
1312 | blocks with no logical preds (or NULL), CONF_FUN_N, the normal | |
1313 | confluence function, TRANS_FUN, the basic block transfer function, | |
1314 | and BLOCKS, the set of blocks to examine, POSTORDER the blocks in | |
1315 | postorder, and N_BLOCKS, the number of blocks in POSTORDER. */ | |
1316 | ||
1317 | void | |
1318 | df_simple_dataflow (enum df_flow_dir dir, | |
1319 | df_init_function init_fun, | |
1320 | df_confluence_function_0 con_fun_0, | |
1321 | df_confluence_function_n con_fun_n, | |
1322 | df_transfer_function trans_fun, | |
1323 | bitmap blocks, int * postorder, int n_blocks) | |
1324 | { | |
1325 | memset (&user_problem, 0, sizeof (struct df_problem)); | |
1326 | user_problem.dir = dir; | |
1327 | user_problem.init_fun = init_fun; | |
1328 | user_problem.con_fun_0 = con_fun_0; | |
1329 | user_problem.con_fun_n = con_fun_n; | |
1330 | user_problem.trans_fun = trans_fun; | |
1331 | user_dflow.problem = &user_problem; | |
1332 | df_worklist_dataflow (&user_dflow, blocks, postorder, n_blocks); | |
1333 | } | |
1334 | ||
b8698a0f | 1335 | |
4d779342 DB |
1336 | \f |
1337 | /*---------------------------------------------------------------------------- | |
1338 | Functions to support limited incremental change. | |
1339 | ----------------------------------------------------------------------------*/ | |
1340 | ||
1341 | ||
1342 | /* Get basic block info. */ | |
1343 | ||
1344 | static void * | |
1345 | df_get_bb_info (struct dataflow *dflow, unsigned int index) | |
1346 | { | |
6fb5fa3c DB |
1347 | if (dflow->block_info == NULL) |
1348 | return NULL; | |
1349 | if (index >= dflow->block_info_size) | |
1350 | return NULL; | |
e285df08 JH |
1351 | return (void *)((char *)dflow->block_info |
1352 | + index * dflow->problem->block_info_elt_size); | |
4d779342 DB |
1353 | } |
1354 | ||
1355 | ||
1356 | /* Set basic block info. */ | |
1357 | ||
1358 | static void | |
b8698a0f | 1359 | df_set_bb_info (struct dataflow *dflow, unsigned int index, |
4d779342 DB |
1360 | void *bb_info) |
1361 | { | |
6fb5fa3c | 1362 | gcc_assert (dflow->block_info); |
e285df08 JH |
1363 | memcpy ((char *)dflow->block_info |
1364 | + index * dflow->problem->block_info_elt_size, | |
1365 | bb_info, dflow->problem->block_info_elt_size); | |
1366 | } | |
1367 | ||
1368 | ||
1369 | /* Clear basic block info. */ | |
1370 | ||
1371 | static void | |
1372 | df_clear_bb_info (struct dataflow *dflow, unsigned int index) | |
1373 | { | |
1374 | gcc_assert (dflow->block_info); | |
1375 | gcc_assert (dflow->block_info_size > index); | |
1376 | memset ((char *)dflow->block_info | |
1377 | + index * dflow->problem->block_info_elt_size, | |
1378 | 0, dflow->problem->block_info_elt_size); | |
4d779342 DB |
1379 | } |
1380 | ||
1381 | ||
6fb5fa3c DB |
1382 | /* Mark the solutions as being out of date. */ |
1383 | ||
b8698a0f | 1384 | void |
6fb5fa3c DB |
1385 | df_mark_solutions_dirty (void) |
1386 | { | |
1387 | if (df) | |
1388 | { | |
b8698a0f | 1389 | int p; |
6fb5fa3c DB |
1390 | for (p = 1; p < df->num_problems_defined; p++) |
1391 | df->problems_in_order[p]->solutions_dirty = true; | |
1392 | } | |
1393 | } | |
1394 | ||
1395 | ||
1396 | /* Return true if BB needs it's transfer functions recomputed. */ | |
1397 | ||
b8698a0f | 1398 | bool |
6fb5fa3c DB |
1399 | df_get_bb_dirty (basic_block bb) |
1400 | { | |
65e0a0f3 JJ |
1401 | return bitmap_bit_p ((df_live |
1402 | ? df_live : df_lr)->out_of_date_transfer_functions, | |
1403 | bb->index); | |
6fb5fa3c DB |
1404 | } |
1405 | ||
1406 | ||
1407 | /* Mark BB as needing it's transfer functions as being out of | |
1408 | date. */ | |
1409 | ||
b8698a0f | 1410 | void |
6fb5fa3c DB |
1411 | df_set_bb_dirty (basic_block bb) |
1412 | { | |
4ec5d4f5 | 1413 | bb->flags |= BB_MODIFIED; |
6fb5fa3c DB |
1414 | if (df) |
1415 | { | |
b8698a0f | 1416 | int p; |
6fb5fa3c DB |
1417 | for (p = 1; p < df->num_problems_defined; p++) |
1418 | { | |
1419 | struct dataflow *dflow = df->problems_in_order[p]; | |
1420 | if (dflow->out_of_date_transfer_functions) | |
1421 | bitmap_set_bit (dflow->out_of_date_transfer_functions, bb->index); | |
1422 | } | |
1423 | df_mark_solutions_dirty (); | |
1424 | } | |
1425 | } | |
1426 | ||
1427 | ||
e285df08 JH |
1428 | /* Grow the bb_info array. */ |
1429 | ||
1430 | void | |
1431 | df_grow_bb_info (struct dataflow *dflow) | |
1432 | { | |
1433 | unsigned int new_size = last_basic_block + 1; | |
1434 | if (dflow->block_info_size < new_size) | |
1435 | { | |
1436 | new_size += new_size / 4; | |
1437 | dflow->block_info | |
1438 | = (void *)XRESIZEVEC (char, (char *)dflow->block_info, | |
1439 | new_size | |
1440 | * dflow->problem->block_info_elt_size); | |
1441 | memset ((char *)dflow->block_info | |
1442 | + dflow->block_info_size | |
1443 | * dflow->problem->block_info_elt_size, | |
1444 | 0, | |
1445 | (new_size - dflow->block_info_size) | |
1446 | * dflow->problem->block_info_elt_size); | |
1447 | dflow->block_info_size = new_size; | |
1448 | } | |
1449 | } | |
1450 | ||
c23cd1d6 | 1451 | |
6fb5fa3c DB |
1452 | /* Clear the dirty bits. This is called from places that delete |
1453 | blocks. */ | |
1454 | static void | |
1455 | df_clear_bb_dirty (basic_block bb) | |
1456 | { | |
b8698a0f | 1457 | int p; |
6fb5fa3c DB |
1458 | for (p = 1; p < df->num_problems_defined; p++) |
1459 | { | |
1460 | struct dataflow *dflow = df->problems_in_order[p]; | |
1461 | if (dflow->out_of_date_transfer_functions) | |
1462 | bitmap_clear_bit (dflow->out_of_date_transfer_functions, bb->index); | |
1463 | } | |
1464 | } | |
e285df08 | 1465 | |
4d779342 DB |
1466 | /* Called from the rtl_compact_blocks to reorganize the problems basic |
1467 | block info. */ | |
1468 | ||
b8698a0f | 1469 | void |
6fb5fa3c | 1470 | df_compact_blocks (void) |
4d779342 DB |
1471 | { |
1472 | int i, p; | |
1473 | basic_block bb; | |
e285df08 | 1474 | void *problem_temps; |
a7e3698d | 1475 | bitmap_head tmp; |
4d779342 | 1476 | |
a7e3698d | 1477 | bitmap_initialize (&tmp, &df_bitmap_obstack); |
4d779342 DB |
1478 | for (p = 0; p < df->num_problems_defined; p++) |
1479 | { | |
1480 | struct dataflow *dflow = df->problems_in_order[p]; | |
6fb5fa3c DB |
1481 | |
1482 | /* Need to reorganize the out_of_date_transfer_functions for the | |
1483 | dflow problem. */ | |
1484 | if (dflow->out_of_date_transfer_functions) | |
1485 | { | |
a7e3698d | 1486 | bitmap_copy (&tmp, dflow->out_of_date_transfer_functions); |
6fb5fa3c | 1487 | bitmap_clear (dflow->out_of_date_transfer_functions); |
a7e3698d | 1488 | if (bitmap_bit_p (&tmp, ENTRY_BLOCK)) |
6fb5fa3c | 1489 | bitmap_set_bit (dflow->out_of_date_transfer_functions, ENTRY_BLOCK); |
a7e3698d | 1490 | if (bitmap_bit_p (&tmp, EXIT_BLOCK)) |
6fb5fa3c DB |
1491 | bitmap_set_bit (dflow->out_of_date_transfer_functions, EXIT_BLOCK); |
1492 | ||
1493 | i = NUM_FIXED_BLOCKS; | |
b8698a0f | 1494 | FOR_EACH_BB (bb) |
6fb5fa3c | 1495 | { |
a7e3698d | 1496 | if (bitmap_bit_p (&tmp, bb->index)) |
6fb5fa3c DB |
1497 | bitmap_set_bit (dflow->out_of_date_transfer_functions, i); |
1498 | i++; | |
1499 | } | |
1500 | } | |
1501 | ||
1502 | /* Now shuffle the block info for the problem. */ | |
e45dcf9c | 1503 | if (dflow->problem->free_bb_fun) |
4d779342 | 1504 | { |
e285df08 JH |
1505 | int size = last_basic_block * dflow->problem->block_info_elt_size; |
1506 | problem_temps = XNEWVAR (char, size); | |
4d779342 DB |
1507 | df_grow_bb_info (dflow); |
1508 | memcpy (problem_temps, dflow->block_info, size); | |
1509 | ||
1510 | /* Copy the bb info from the problem tmps to the proper | |
1511 | place in the block_info vector. Null out the copied | |
6fb5fa3c | 1512 | item. The entry and exit blocks never move. */ |
4d779342 | 1513 | i = NUM_FIXED_BLOCKS; |
b8698a0f | 1514 | FOR_EACH_BB (bb) |
4d779342 | 1515 | { |
e285df08 JH |
1516 | df_set_bb_info (dflow, i, |
1517 | (char *)problem_temps | |
1518 | + bb->index * dflow->problem->block_info_elt_size); | |
4d779342 DB |
1519 | i++; |
1520 | } | |
e285df08 JH |
1521 | memset ((char *)dflow->block_info |
1522 | + i * dflow->problem->block_info_elt_size, 0, | |
1523 | (last_basic_block - i) | |
1524 | * dflow->problem->block_info_elt_size); | |
f75aa51c | 1525 | free (problem_temps); |
4d779342 DB |
1526 | } |
1527 | } | |
1528 | ||
6fb5fa3c DB |
1529 | /* Shuffle the bits in the basic_block indexed arrays. */ |
1530 | ||
1531 | if (df->blocks_to_analyze) | |
1532 | { | |
a7e3698d | 1533 | if (bitmap_bit_p (&tmp, ENTRY_BLOCK)) |
6fb5fa3c | 1534 | bitmap_set_bit (df->blocks_to_analyze, ENTRY_BLOCK); |
a7e3698d | 1535 | if (bitmap_bit_p (&tmp, EXIT_BLOCK)) |
6fb5fa3c | 1536 | bitmap_set_bit (df->blocks_to_analyze, EXIT_BLOCK); |
a7e3698d | 1537 | bitmap_copy (&tmp, df->blocks_to_analyze); |
6fb5fa3c DB |
1538 | bitmap_clear (df->blocks_to_analyze); |
1539 | i = NUM_FIXED_BLOCKS; | |
b8698a0f | 1540 | FOR_EACH_BB (bb) |
6fb5fa3c | 1541 | { |
a7e3698d | 1542 | if (bitmap_bit_p (&tmp, bb->index)) |
6fb5fa3c DB |
1543 | bitmap_set_bit (df->blocks_to_analyze, i); |
1544 | i++; | |
1545 | } | |
1546 | } | |
1547 | ||
a7e3698d | 1548 | bitmap_clear (&tmp); |
6fb5fa3c | 1549 | |
4d779342 | 1550 | i = NUM_FIXED_BLOCKS; |
b8698a0f | 1551 | FOR_EACH_BB (bb) |
4d779342 | 1552 | { |
9be0cc75 | 1553 | SET_BASIC_BLOCK (i, bb); |
4d779342 DB |
1554 | bb->index = i; |
1555 | i++; | |
1556 | } | |
1557 | ||
1558 | gcc_assert (i == n_basic_blocks); | |
1559 | ||
1560 | for (; i < last_basic_block; i++) | |
9be0cc75 | 1561 | SET_BASIC_BLOCK (i, NULL); |
6fb5fa3c DB |
1562 | |
1563 | #ifdef DF_DEBUG_CFG | |
1564 | if (!df_lr->solutions_dirty) | |
1565 | df_set_clean_cfg (); | |
1566 | #endif | |
4d779342 DB |
1567 | } |
1568 | ||
1569 | ||
6fb5fa3c | 1570 | /* Shove NEW_BLOCK in at OLD_INDEX. Called from ifcvt to hack a |
4d779342 DB |
1571 | block. There is no excuse for people to do this kind of thing. */ |
1572 | ||
b8698a0f | 1573 | void |
6fb5fa3c | 1574 | df_bb_replace (int old_index, basic_block new_block) |
4d779342 | 1575 | { |
6fb5fa3c | 1576 | int new_block_index = new_block->index; |
4d779342 DB |
1577 | int p; |
1578 | ||
6fb5fa3c DB |
1579 | if (dump_file) |
1580 | fprintf (dump_file, "shoving block %d into %d\n", new_block_index, old_index); | |
1581 | ||
1582 | gcc_assert (df); | |
1583 | gcc_assert (BASIC_BLOCK (old_index) == NULL); | |
1584 | ||
4d779342 DB |
1585 | for (p = 0; p < df->num_problems_defined; p++) |
1586 | { | |
1587 | struct dataflow *dflow = df->problems_in_order[p]; | |
1588 | if (dflow->block_info) | |
1589 | { | |
4d779342 | 1590 | df_grow_bb_info (dflow); |
b8698a0f | 1591 | df_set_bb_info (dflow, old_index, |
6fb5fa3c | 1592 | df_get_bb_info (dflow, new_block_index)); |
4d779342 DB |
1593 | } |
1594 | } | |
1595 | ||
6fb5fa3c | 1596 | df_clear_bb_dirty (new_block); |
9be0cc75 | 1597 | SET_BASIC_BLOCK (old_index, new_block); |
4d779342 | 1598 | new_block->index = old_index; |
6fb5fa3c DB |
1599 | df_set_bb_dirty (BASIC_BLOCK (old_index)); |
1600 | SET_BASIC_BLOCK (new_block_index, NULL); | |
1601 | } | |
1602 | ||
1603 | ||
1604 | /* Free all of the per basic block dataflow from all of the problems. | |
1605 | This is typically called before a basic block is deleted and the | |
1606 | problem will be reanalyzed. */ | |
1607 | ||
1608 | void | |
1609 | df_bb_delete (int bb_index) | |
1610 | { | |
1611 | basic_block bb = BASIC_BLOCK (bb_index); | |
1612 | int i; | |
1613 | ||
1614 | if (!df) | |
1615 | return; | |
b8698a0f | 1616 | |
6fb5fa3c DB |
1617 | for (i = 0; i < df->num_problems_defined; i++) |
1618 | { | |
1619 | struct dataflow *dflow = df->problems_in_order[i]; | |
1620 | if (dflow->problem->free_bb_fun) | |
1621 | { | |
1622 | void *bb_info = df_get_bb_info (dflow, bb_index); | |
1623 | if (bb_info) | |
1624 | { | |
b8698a0f | 1625 | dflow->problem->free_bb_fun (bb, bb_info); |
e285df08 | 1626 | df_clear_bb_info (dflow, bb_index); |
6fb5fa3c DB |
1627 | } |
1628 | } | |
1629 | } | |
1630 | df_clear_bb_dirty (bb); | |
1631 | df_mark_solutions_dirty (); | |
1632 | } | |
1633 | ||
1634 | ||
1635 | /* Verify that there is a place for everything and everything is in | |
1636 | its place. This is too expensive to run after every pass in the | |
1637 | mainline. However this is an excellent debugging tool if the | |
6ed3da00 | 1638 | dataflow information is not being updated properly. You can just |
6fb5fa3c DB |
1639 | sprinkle calls in until you find the place that is changing an |
1640 | underlying structure without calling the proper updating | |
0d52bcc1 | 1641 | routine. */ |
6fb5fa3c DB |
1642 | |
1643 | void | |
1644 | df_verify (void) | |
1645 | { | |
1646 | df_scan_verify (); | |
0d475361 | 1647 | #ifdef ENABLE_DF_CHECKING |
6fb5fa3c DB |
1648 | df_lr_verify_transfer_functions (); |
1649 | if (df_live) | |
1650 | df_live_verify_transfer_functions (); | |
0d475361 | 1651 | #endif |
6fb5fa3c DB |
1652 | } |
1653 | ||
1654 | #ifdef DF_DEBUG_CFG | |
1655 | ||
1656 | /* Compute an array of ints that describes the cfg. This can be used | |
1657 | to discover places where the cfg is modified by the appropriate | |
1658 | calls have not been made to the keep df informed. The internals of | |
1659 | this are unexciting, the key is that two instances of this can be | |
1660 | compared to see if any changes have been made to the cfg. */ | |
1661 | ||
1662 | static int * | |
1663 | df_compute_cfg_image (void) | |
1664 | { | |
1665 | basic_block bb; | |
1666 | int size = 2 + (2 * n_basic_blocks); | |
1667 | int i; | |
1668 | int * map; | |
1669 | ||
1670 | FOR_ALL_BB (bb) | |
1671 | { | |
1672 | size += EDGE_COUNT (bb->succs); | |
1673 | } | |
1674 | ||
1675 | map = XNEWVEC (int, size); | |
1676 | map[0] = size; | |
1677 | i = 1; | |
1678 | FOR_ALL_BB (bb) | |
1679 | { | |
1680 | edge_iterator ei; | |
1681 | edge e; | |
1682 | ||
1683 | map[i++] = bb->index; | |
1684 | FOR_EACH_EDGE (e, ei, bb->succs) | |
1685 | map[i++] = e->dest->index; | |
1686 | map[i++] = -1; | |
1687 | } | |
1688 | map[i] = -1; | |
1689 | return map; | |
1690 | } | |
1691 | ||
1692 | static int *saved_cfg = NULL; | |
1693 | ||
1694 | ||
1695 | /* This function compares the saved version of the cfg with the | |
1696 | current cfg and aborts if the two are identical. The function | |
1697 | silently returns if the cfg has been marked as dirty or the two are | |
1698 | the same. */ | |
1699 | ||
1700 | void | |
1701 | df_check_cfg_clean (void) | |
1702 | { | |
1703 | int *new_map; | |
1704 | ||
1705 | if (!df) | |
1706 | return; | |
1707 | ||
1708 | if (df_lr->solutions_dirty) | |
1709 | return; | |
1710 | ||
b8698a0f | 1711 | if (saved_cfg == NULL) |
6fb5fa3c DB |
1712 | return; |
1713 | ||
1714 | new_map = df_compute_cfg_image (); | |
1715 | gcc_assert (memcmp (saved_cfg, new_map, saved_cfg[0] * sizeof (int)) == 0); | |
1716 | free (new_map); | |
4d779342 DB |
1717 | } |
1718 | ||
6fb5fa3c DB |
1719 | |
1720 | /* This function builds a cfg fingerprint and squirrels it away in | |
1721 | saved_cfg. */ | |
1722 | ||
1723 | static void | |
1724 | df_set_clean_cfg (void) | |
1725 | { | |
04695783 | 1726 | free (saved_cfg); |
6fb5fa3c DB |
1727 | saved_cfg = df_compute_cfg_image (); |
1728 | } | |
1729 | ||
1730 | #endif /* DF_DEBUG_CFG */ | |
4d779342 DB |
1731 | /*---------------------------------------------------------------------------- |
1732 | PUBLIC INTERFACES TO QUERY INFORMATION. | |
1733 | ----------------------------------------------------------------------------*/ | |
1734 | ||
1735 | ||
4d779342 DB |
1736 | /* Return first def of REGNO within BB. */ |
1737 | ||
b8698a0f | 1738 | df_ref |
6fb5fa3c | 1739 | df_bb_regno_first_def_find (basic_block bb, unsigned int regno) |
4d779342 DB |
1740 | { |
1741 | rtx insn; | |
57512f53 | 1742 | df_ref *def_rec; |
a1b53177 | 1743 | unsigned int uid; |
4d779342 DB |
1744 | |
1745 | FOR_BB_INSNS (bb, insn) | |
1746 | { | |
a1b53177 SB |
1747 | if (!INSN_P (insn)) |
1748 | continue; | |
1749 | ||
1750 | uid = INSN_UID (insn); | |
6fb5fa3c DB |
1751 | for (def_rec = DF_INSN_UID_DEFS (uid); *def_rec; def_rec++) |
1752 | { | |
57512f53 | 1753 | df_ref def = *def_rec; |
6fb5fa3c DB |
1754 | if (DF_REF_REGNO (def) == regno) |
1755 | return def; | |
1756 | } | |
4d779342 DB |
1757 | } |
1758 | return NULL; | |
1759 | } | |
1760 | ||
1761 | ||
1762 | /* Return last def of REGNO within BB. */ | |
1763 | ||
b8698a0f | 1764 | df_ref |
6fb5fa3c | 1765 | df_bb_regno_last_def_find (basic_block bb, unsigned int regno) |
4d779342 DB |
1766 | { |
1767 | rtx insn; | |
57512f53 | 1768 | df_ref *def_rec; |
a1b53177 | 1769 | unsigned int uid; |
4d779342 DB |
1770 | |
1771 | FOR_BB_INSNS_REVERSE (bb, insn) | |
1772 | { | |
a1b53177 SB |
1773 | if (!INSN_P (insn)) |
1774 | continue; | |
4d779342 | 1775 | |
a1b53177 | 1776 | uid = INSN_UID (insn); |
6fb5fa3c DB |
1777 | for (def_rec = DF_INSN_UID_DEFS (uid); *def_rec; def_rec++) |
1778 | { | |
57512f53 | 1779 | df_ref def = *def_rec; |
6fb5fa3c DB |
1780 | if (DF_REF_REGNO (def) == regno) |
1781 | return def; | |
1782 | } | |
4d779342 DB |
1783 | } |
1784 | ||
1785 | return NULL; | |
1786 | } | |
1787 | ||
4d779342 DB |
1788 | /* Finds the reference corresponding to the definition of REG in INSN. |
1789 | DF is the dataflow object. */ | |
1790 | ||
b8698a0f | 1791 | df_ref |
6fb5fa3c | 1792 | df_find_def (rtx insn, rtx reg) |
4d779342 DB |
1793 | { |
1794 | unsigned int uid; | |
57512f53 | 1795 | df_ref *def_rec; |
4d779342 DB |
1796 | |
1797 | if (GET_CODE (reg) == SUBREG) | |
1798 | reg = SUBREG_REG (reg); | |
1799 | gcc_assert (REG_P (reg)); | |
1800 | ||
1801 | uid = INSN_UID (insn); | |
6fb5fa3c DB |
1802 | for (def_rec = DF_INSN_UID_DEFS (uid); *def_rec; def_rec++) |
1803 | { | |
57512f53 | 1804 | df_ref def = *def_rec; |
6fb5fa3c DB |
1805 | if (rtx_equal_p (DF_REF_REAL_REG (def), reg)) |
1806 | return def; | |
1807 | } | |
4d779342 DB |
1808 | |
1809 | return NULL; | |
1810 | } | |
1811 | ||
1812 | ||
b8698a0f | 1813 | /* Return true if REG is defined in INSN, zero otherwise. */ |
4d779342 DB |
1814 | |
1815 | bool | |
6fb5fa3c | 1816 | df_reg_defined (rtx insn, rtx reg) |
4d779342 | 1817 | { |
6fb5fa3c | 1818 | return df_find_def (insn, reg) != NULL; |
4d779342 | 1819 | } |
b8698a0f | 1820 | |
4d779342 DB |
1821 | |
1822 | /* Finds the reference corresponding to the use of REG in INSN. | |
1823 | DF is the dataflow object. */ | |
b8698a0f L |
1824 | |
1825 | df_ref | |
6fb5fa3c | 1826 | df_find_use (rtx insn, rtx reg) |
4d779342 DB |
1827 | { |
1828 | unsigned int uid; | |
57512f53 | 1829 | df_ref *use_rec; |
4d779342 DB |
1830 | |
1831 | if (GET_CODE (reg) == SUBREG) | |
1832 | reg = SUBREG_REG (reg); | |
1833 | gcc_assert (REG_P (reg)); | |
1834 | ||
1835 | uid = INSN_UID (insn); | |
6fb5fa3c DB |
1836 | for (use_rec = DF_INSN_UID_USES (uid); *use_rec; use_rec++) |
1837 | { | |
57512f53 | 1838 | df_ref use = *use_rec; |
6fb5fa3c DB |
1839 | if (rtx_equal_p (DF_REF_REAL_REG (use), reg)) |
1840 | return use; | |
b8698a0f | 1841 | } |
6fb5fa3c DB |
1842 | if (df->changeable_flags & DF_EQ_NOTES) |
1843 | for (use_rec = DF_INSN_UID_EQ_USES (uid); *use_rec; use_rec++) | |
1844 | { | |
57512f53 | 1845 | df_ref use = *use_rec; |
6fb5fa3c | 1846 | if (rtx_equal_p (DF_REF_REAL_REG (use), reg)) |
b8698a0f | 1847 | return use; |
6fb5fa3c | 1848 | } |
4d779342 DB |
1849 | return NULL; |
1850 | } | |
1851 | ||
1852 | ||
b8698a0f | 1853 | /* Return true if REG is referenced in INSN, zero otherwise. */ |
4d779342 DB |
1854 | |
1855 | bool | |
6fb5fa3c | 1856 | df_reg_used (rtx insn, rtx reg) |
4d779342 | 1857 | { |
6fb5fa3c | 1858 | return df_find_use (insn, reg) != NULL; |
4d779342 | 1859 | } |
b8698a0f | 1860 | |
4d779342 DB |
1861 | \f |
1862 | /*---------------------------------------------------------------------------- | |
1863 | Debugging and printing functions. | |
1864 | ----------------------------------------------------------------------------*/ | |
1865 | ||
532aafad SB |
1866 | /* Write information about registers and basic blocks into FILE. |
1867 | This is part of making a debugging dump. */ | |
1868 | ||
1869 | void | |
1870 | dump_regset (regset r, FILE *outf) | |
1871 | { | |
1872 | unsigned i; | |
1873 | reg_set_iterator rsi; | |
1874 | ||
1875 | if (r == NULL) | |
1876 | { | |
1877 | fputs (" (nil)", outf); | |
1878 | return; | |
1879 | } | |
1880 | ||
1881 | EXECUTE_IF_SET_IN_REG_SET (r, 0, i, rsi) | |
1882 | { | |
1883 | fprintf (outf, " %d", i); | |
1884 | if (i < FIRST_PSEUDO_REGISTER) | |
1885 | fprintf (outf, " [%s]", | |
1886 | reg_names[i]); | |
1887 | } | |
1888 | } | |
1889 | ||
1890 | /* Print a human-readable representation of R on the standard error | |
1891 | stream. This function is designed to be used from within the | |
1892 | debugger. */ | |
1893 | extern void debug_regset (regset); | |
1894 | DEBUG_FUNCTION void | |
1895 | debug_regset (regset r) | |
1896 | { | |
1897 | dump_regset (r, stderr); | |
1898 | putc ('\n', stderr); | |
1899 | } | |
6fb5fa3c DB |
1900 | |
1901 | /* Write information about registers and basic blocks into FILE. | |
1902 | This is part of making a debugging dump. */ | |
1903 | ||
1904 | void | |
1905 | df_print_regset (FILE *file, bitmap r) | |
1906 | { | |
1907 | unsigned int i; | |
1908 | bitmap_iterator bi; | |
1909 | ||
1910 | if (r == NULL) | |
1911 | fputs (" (nil)", file); | |
1912 | else | |
1913 | { | |
1914 | EXECUTE_IF_SET_IN_BITMAP (r, 0, i, bi) | |
1915 | { | |
1916 | fprintf (file, " %d", i); | |
1917 | if (i < FIRST_PSEUDO_REGISTER) | |
1918 | fprintf (file, " [%s]", reg_names[i]); | |
1919 | } | |
1920 | } | |
1921 | fprintf (file, "\n"); | |
1922 | } | |
1923 | ||
1924 | ||
cc806ac1 RS |
1925 | /* Write information about registers and basic blocks into FILE. The |
1926 | bitmap is in the form used by df_byte_lr. This is part of making a | |
1927 | debugging dump. */ | |
1928 | ||
1929 | void | |
8d074192 | 1930 | df_print_word_regset (FILE *file, bitmap r) |
cc806ac1 RS |
1931 | { |
1932 | unsigned int max_reg = max_reg_num (); | |
cc806ac1 RS |
1933 | |
1934 | if (r == NULL) | |
1935 | fputs (" (nil)", file); | |
1936 | else | |
1937 | { | |
1938 | unsigned int i; | |
8d074192 | 1939 | for (i = FIRST_PSEUDO_REGISTER; i < max_reg; i++) |
cc806ac1 | 1940 | { |
8d074192 BS |
1941 | bool found = (bitmap_bit_p (r, 2 * i) |
1942 | || bitmap_bit_p (r, 2 * i + 1)); | |
1943 | if (found) | |
cc806ac1 | 1944 | { |
8d074192 BS |
1945 | int word; |
1946 | const char * sep = ""; | |
1947 | fprintf (file, " %d", i); | |
1948 | fprintf (file, "("); | |
1949 | for (word = 0; word < 2; word++) | |
1950 | if (bitmap_bit_p (r, 2 * i + word)) | |
1951 | { | |
1952 | fprintf (file, "%s%d", sep, word); | |
1953 | sep = ", "; | |
1954 | } | |
1955 | fprintf (file, ")"); | |
cc806ac1 | 1956 | } |
cc806ac1 RS |
1957 | } |
1958 | } | |
1959 | fprintf (file, "\n"); | |
1960 | } | |
1961 | ||
1962 | ||
4d779342 | 1963 | /* Dump dataflow info. */ |
ffd640ed | 1964 | |
4d779342 | 1965 | void |
6fb5fa3c DB |
1966 | df_dump (FILE *file) |
1967 | { | |
1968 | basic_block bb; | |
1969 | df_dump_start (file); | |
1970 | ||
1971 | FOR_ALL_BB (bb) | |
1972 | { | |
1973 | df_print_bb_index (bb, file); | |
1974 | df_dump_top (bb, file); | |
1975 | df_dump_bottom (bb, file); | |
1976 | } | |
1977 | ||
1978 | fprintf (file, "\n"); | |
1979 | } | |
1980 | ||
1981 | ||
ffd640ed KZ |
1982 | /* Dump dataflow info for df->blocks_to_analyze. */ |
1983 | ||
1984 | void | |
1985 | df_dump_region (FILE *file) | |
1986 | { | |
1987 | if (df->blocks_to_analyze) | |
1988 | { | |
1989 | bitmap_iterator bi; | |
1990 | unsigned int bb_index; | |
1991 | ||
1992 | fprintf (file, "\n\nstarting region dump\n"); | |
1993 | df_dump_start (file); | |
b8698a0f L |
1994 | |
1995 | EXECUTE_IF_SET_IN_BITMAP (df->blocks_to_analyze, 0, bb_index, bi) | |
ffd640ed KZ |
1996 | { |
1997 | basic_block bb = BASIC_BLOCK (bb_index); | |
b8698a0f | 1998 | |
ffd640ed KZ |
1999 | df_print_bb_index (bb, file); |
2000 | df_dump_top (bb, file); | |
2001 | df_dump_bottom (bb, file); | |
2002 | } | |
2003 | fprintf (file, "\n"); | |
2004 | } | |
b8698a0f | 2005 | else |
ffd640ed KZ |
2006 | df_dump (file); |
2007 | } | |
2008 | ||
2009 | ||
6fb5fa3c DB |
2010 | /* Dump the introductory information for each problem defined. */ |
2011 | ||
2012 | void | |
2013 | df_dump_start (FILE *file) | |
4d779342 DB |
2014 | { |
2015 | int i; | |
2016 | ||
23249ac4 | 2017 | if (!df || !file) |
4d779342 DB |
2018 | return; |
2019 | ||
2020 | fprintf (file, "\n\n%s\n", current_function_name ()); | |
2021 | fprintf (file, "\nDataflow summary:\n"); | |
6fb5fa3c DB |
2022 | if (df->blocks_to_analyze) |
2023 | fprintf (file, "def_info->table_size = %d, use_info->table_size = %d\n", | |
2024 | DF_DEFS_TABLE_SIZE (), DF_USES_TABLE_SIZE ()); | |
4d779342 DB |
2025 | |
2026 | for (i = 0; i < df->num_problems_defined; i++) | |
6fb5fa3c DB |
2027 | { |
2028 | struct dataflow *dflow = df->problems_in_order[i]; | |
2029 | if (dflow->computed) | |
2030 | { | |
2031 | df_dump_problem_function fun = dflow->problem->dump_start_fun; | |
2032 | if (fun) | |
b8698a0f | 2033 | fun(file); |
6fb5fa3c DB |
2034 | } |
2035 | } | |
2036 | } | |
4d779342 | 2037 | |
6fb5fa3c | 2038 | |
b8698a0f | 2039 | /* Dump the top of the block information for BB. */ |
6fb5fa3c DB |
2040 | |
2041 | void | |
2042 | df_dump_top (basic_block bb, FILE *file) | |
2043 | { | |
2044 | int i; | |
2045 | ||
2046 | if (!df || !file) | |
2047 | return; | |
2048 | ||
2049 | for (i = 0; i < df->num_problems_defined; i++) | |
2050 | { | |
2051 | struct dataflow *dflow = df->problems_in_order[i]; | |
2052 | if (dflow->computed) | |
2053 | { | |
2054 | df_dump_bb_problem_function bbfun = dflow->problem->dump_top_fun; | |
2055 | if (bbfun) | |
b8698a0f | 2056 | bbfun (bb, file); |
6fb5fa3c DB |
2057 | } |
2058 | } | |
2059 | } | |
2060 | ||
2061 | ||
b8698a0f | 2062 | /* Dump the bottom of the block information for BB. */ |
6fb5fa3c DB |
2063 | |
2064 | void | |
2065 | df_dump_bottom (basic_block bb, FILE *file) | |
2066 | { | |
2067 | int i; | |
2068 | ||
2069 | if (!df || !file) | |
2070 | return; | |
2071 | ||
2072 | for (i = 0; i < df->num_problems_defined; i++) | |
2073 | { | |
2074 | struct dataflow *dflow = df->problems_in_order[i]; | |
2075 | if (dflow->computed) | |
2076 | { | |
2077 | df_dump_bb_problem_function bbfun = dflow->problem->dump_bottom_fun; | |
2078 | if (bbfun) | |
b8698a0f | 2079 | bbfun (bb, file); |
6fb5fa3c DB |
2080 | } |
2081 | } | |
4d779342 DB |
2082 | } |
2083 | ||
2084 | ||
885c9b5d EB |
2085 | static void |
2086 | df_ref_dump (df_ref ref, FILE *file) | |
2087 | { | |
2088 | fprintf (file, "%c%d(%d)", | |
2089 | DF_REF_REG_DEF_P (ref) | |
2090 | ? 'd' | |
2091 | : (DF_REF_FLAGS (ref) & DF_REF_IN_NOTE) ? 'e' : 'u', | |
2092 | DF_REF_ID (ref), | |
2093 | DF_REF_REGNO (ref)); | |
2094 | } | |
2095 | ||
4d779342 | 2096 | void |
57512f53 | 2097 | df_refs_chain_dump (df_ref *ref_rec, bool follow_chain, FILE *file) |
4d779342 DB |
2098 | { |
2099 | fprintf (file, "{ "); | |
6fb5fa3c | 2100 | while (*ref_rec) |
4d779342 | 2101 | { |
57512f53 | 2102 | df_ref ref = *ref_rec; |
885c9b5d | 2103 | df_ref_dump (ref, file); |
4d779342 | 2104 | if (follow_chain) |
23249ac4 | 2105 | df_chain_dump (DF_REF_CHAIN (ref), file); |
6fb5fa3c | 2106 | ref_rec++; |
4d779342 DB |
2107 | } |
2108 | fprintf (file, "}"); | |
2109 | } | |
2110 | ||
2111 | ||
2112 | /* Dump either a ref-def or reg-use chain. */ | |
2113 | ||
2114 | void | |
57512f53 | 2115 | df_regs_chain_dump (df_ref ref, FILE *file) |
4d779342 DB |
2116 | { |
2117 | fprintf (file, "{ "); | |
2118 | while (ref) | |
2119 | { | |
885c9b5d | 2120 | df_ref_dump (ref, file); |
57512f53 | 2121 | ref = DF_REF_NEXT_REG (ref); |
4d779342 DB |
2122 | } |
2123 | fprintf (file, "}"); | |
2124 | } | |
2125 | ||
2126 | ||
23249ac4 | 2127 | static void |
6fb5fa3c | 2128 | df_mws_dump (struct df_mw_hardreg **mws, FILE *file) |
4d779342 | 2129 | { |
6fb5fa3c | 2130 | while (*mws) |
23249ac4 | 2131 | { |
b8698a0f | 2132 | fprintf (file, "mw %c r[%d..%d]\n", |
57512f53 | 2133 | (DF_MWS_REG_DEF_P (*mws)) ? 'd' : 'u', |
6fb5fa3c DB |
2134 | (*mws)->start_regno, (*mws)->end_regno); |
2135 | mws++; | |
23249ac4 DB |
2136 | } |
2137 | } | |
2138 | ||
2139 | ||
b8698a0f L |
2140 | static void |
2141 | df_insn_uid_debug (unsigned int uid, | |
23249ac4 DB |
2142 | bool follow_chain, FILE *file) |
2143 | { | |
6fb5fa3c DB |
2144 | fprintf (file, "insn %d luid %d", |
2145 | uid, DF_INSN_UID_LUID (uid)); | |
4d779342 | 2146 | |
6fb5fa3c | 2147 | if (DF_INSN_UID_DEFS (uid)) |
23249ac4 DB |
2148 | { |
2149 | fprintf (file, " defs "); | |
6fb5fa3c | 2150 | df_refs_chain_dump (DF_INSN_UID_DEFS (uid), follow_chain, file); |
23249ac4 DB |
2151 | } |
2152 | ||
6fb5fa3c | 2153 | if (DF_INSN_UID_USES (uid)) |
23249ac4 DB |
2154 | { |
2155 | fprintf (file, " uses "); | |
6fb5fa3c DB |
2156 | df_refs_chain_dump (DF_INSN_UID_USES (uid), follow_chain, file); |
2157 | } | |
2158 | ||
2159 | if (DF_INSN_UID_EQ_USES (uid)) | |
2160 | { | |
2161 | fprintf (file, " eq uses "); | |
2162 | df_refs_chain_dump (DF_INSN_UID_EQ_USES (uid), follow_chain, file); | |
23249ac4 DB |
2163 | } |
2164 | ||
6fb5fa3c | 2165 | if (DF_INSN_UID_MWS (uid)) |
23249ac4 DB |
2166 | { |
2167 | fprintf (file, " mws "); | |
6fb5fa3c | 2168 | df_mws_dump (DF_INSN_UID_MWS (uid), file); |
23249ac4 | 2169 | } |
4d779342 DB |
2170 | fprintf (file, "\n"); |
2171 | } | |
2172 | ||
23249ac4 | 2173 | |
24e47c76 | 2174 | DEBUG_FUNCTION void |
6fb5fa3c | 2175 | df_insn_debug (rtx insn, bool follow_chain, FILE *file) |
23249ac4 | 2176 | { |
6fb5fa3c | 2177 | df_insn_uid_debug (INSN_UID (insn), follow_chain, file); |
23249ac4 DB |
2178 | } |
2179 | ||
24e47c76 | 2180 | DEBUG_FUNCTION void |
6fb5fa3c | 2181 | df_insn_debug_regno (rtx insn, FILE *file) |
4d779342 | 2182 | { |
50e94c7e | 2183 | struct df_insn_info *insn_info = DF_INSN_INFO_GET (insn); |
4d779342 DB |
2184 | |
2185 | fprintf (file, "insn %d bb %d luid %d defs ", | |
50e94c7e SB |
2186 | INSN_UID (insn), BLOCK_FOR_INSN (insn)->index, |
2187 | DF_INSN_INFO_LUID (insn_info)); | |
2188 | df_refs_chain_dump (DF_INSN_INFO_DEFS (insn_info), false, file); | |
b8698a0f | 2189 | |
4d779342 | 2190 | fprintf (file, " uses "); |
50e94c7e | 2191 | df_refs_chain_dump (DF_INSN_INFO_USES (insn_info), false, file); |
6fb5fa3c DB |
2192 | |
2193 | fprintf (file, " eq_uses "); | |
50e94c7e | 2194 | df_refs_chain_dump (DF_INSN_INFO_EQ_USES (insn_info), false, file); |
4d779342 DB |
2195 | fprintf (file, "\n"); |
2196 | } | |
2197 | ||
24e47c76 | 2198 | DEBUG_FUNCTION void |
6fb5fa3c | 2199 | df_regno_debug (unsigned int regno, FILE *file) |
4d779342 DB |
2200 | { |
2201 | fprintf (file, "reg %d defs ", regno); | |
6fb5fa3c | 2202 | df_regs_chain_dump (DF_REG_DEF_CHAIN (regno), file); |
4d779342 | 2203 | fprintf (file, " uses "); |
6fb5fa3c DB |
2204 | df_regs_chain_dump (DF_REG_USE_CHAIN (regno), file); |
2205 | fprintf (file, " eq_uses "); | |
2206 | df_regs_chain_dump (DF_REG_EQ_USE_CHAIN (regno), file); | |
4d779342 DB |
2207 | fprintf (file, "\n"); |
2208 | } | |
2209 | ||
2210 | ||
24e47c76 | 2211 | DEBUG_FUNCTION void |
57512f53 | 2212 | df_ref_debug (df_ref ref, FILE *file) |
4d779342 DB |
2213 | { |
2214 | fprintf (file, "%c%d ", | |
2215 | DF_REF_REG_DEF_P (ref) ? 'd' : 'u', | |
2216 | DF_REF_ID (ref)); | |
a3f1cee4 | 2217 | fprintf (file, "reg %d bb %d insn %d flag %#x type %#x ", |
4d779342 DB |
2218 | DF_REF_REGNO (ref), |
2219 | DF_REF_BBNO (ref), | |
57512f53 | 2220 | DF_REF_IS_ARTIFICIAL (ref) ? -1 : DF_REF_INSN_UID (ref), |
6fb5fa3c DB |
2221 | DF_REF_FLAGS (ref), |
2222 | DF_REF_TYPE (ref)); | |
2223 | if (DF_REF_LOC (ref)) | |
8588f797 AO |
2224 | { |
2225 | if (flag_dump_noaddr) | |
2226 | fprintf (file, "loc #(#) chain "); | |
2227 | else | |
2228 | fprintf (file, "loc %p(%p) chain ", (void *)DF_REF_LOC (ref), | |
2229 | (void *)*DF_REF_LOC (ref)); | |
2230 | } | |
6fb5fa3c DB |
2231 | else |
2232 | fprintf (file, "chain "); | |
23249ac4 | 2233 | df_chain_dump (DF_REF_CHAIN (ref), file); |
4d779342 DB |
2234 | fprintf (file, "\n"); |
2235 | } | |
2236 | \f | |
2237 | /* Functions for debugging from GDB. */ | |
2238 | ||
24e47c76 | 2239 | DEBUG_FUNCTION void |
4d779342 DB |
2240 | debug_df_insn (rtx insn) |
2241 | { | |
6fb5fa3c | 2242 | df_insn_debug (insn, true, stderr); |
4d779342 DB |
2243 | debug_rtx (insn); |
2244 | } | |
2245 | ||
2246 | ||
24e47c76 | 2247 | DEBUG_FUNCTION void |
4d779342 DB |
2248 | debug_df_reg (rtx reg) |
2249 | { | |
6fb5fa3c | 2250 | df_regno_debug (REGNO (reg), stderr); |
4d779342 DB |
2251 | } |
2252 | ||
2253 | ||
24e47c76 | 2254 | DEBUG_FUNCTION void |
4d779342 DB |
2255 | debug_df_regno (unsigned int regno) |
2256 | { | |
6fb5fa3c | 2257 | df_regno_debug (regno, stderr); |
4d779342 DB |
2258 | } |
2259 | ||
2260 | ||
24e47c76 | 2261 | DEBUG_FUNCTION void |
57512f53 | 2262 | debug_df_ref (df_ref ref) |
4d779342 | 2263 | { |
23249ac4 | 2264 | df_ref_debug (ref, stderr); |
4d779342 DB |
2265 | } |
2266 | ||
2267 | ||
24e47c76 | 2268 | DEBUG_FUNCTION void |
4d779342 DB |
2269 | debug_df_defno (unsigned int defno) |
2270 | { | |
6fb5fa3c | 2271 | df_ref_debug (DF_DEFS_GET (defno), stderr); |
4d779342 DB |
2272 | } |
2273 | ||
2274 | ||
24e47c76 | 2275 | DEBUG_FUNCTION void |
4d779342 DB |
2276 | debug_df_useno (unsigned int defno) |
2277 | { | |
6fb5fa3c | 2278 | df_ref_debug (DF_USES_GET (defno), stderr); |
4d779342 DB |
2279 | } |
2280 | ||
2281 | ||
24e47c76 | 2282 | DEBUG_FUNCTION void |
4d779342 DB |
2283 | debug_df_chain (struct df_link *link) |
2284 | { | |
23249ac4 | 2285 | df_chain_dump (link, stderr); |
4d779342 DB |
2286 | fputc ('\n', stderr); |
2287 | } |