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4d779342 | 1 | /* Allocation for dataflow support routines. |
a5544970 | 2 | Copyright (C) 1999-2019 Free Software Foundation, Inc. |
b8698a0f | 3 | Originally contributed by Michael P. Hayes |
4d779342 DB |
4 | (m.hayes@elec.canterbury.ac.nz, mhayes@redhat.com) |
5 | Major rewrite contributed by Danny Berlin (dberlin@dberlin.org) | |
6 | and Kenneth Zadeck (zadeck@naturalbridge.com). | |
7 | ||
8 | This file is part of GCC. | |
9 | ||
10 | GCC is free software; you can redistribute it and/or modify it under | |
11 | the terms of the GNU General Public License as published by the Free | |
9dcd6f09 | 12 | Software Foundation; either version 3, or (at your option) any later |
4d779342 DB |
13 | version. |
14 | ||
15 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
16 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
17 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
18 | for more details. | |
19 | ||
20 | You should have received a copy of the GNU General Public License | |
9dcd6f09 NC |
21 | along with GCC; see the file COPYING3. If not see |
22 | <http://www.gnu.org/licenses/>. */ | |
4d779342 DB |
23 | |
24 | /* | |
25 | OVERVIEW: | |
26 | ||
27 | The files in this collection (df*.c,df.h) provide a general framework | |
28 | for solving dataflow problems. The global dataflow is performed using | |
29 | a good implementation of iterative dataflow analysis. | |
30 | ||
31 | The file df-problems.c provides problem instance for the most common | |
32 | dataflow problems: reaching defs, upward exposed uses, live variables, | |
33 | uninitialized variables, def-use chains, and use-def chains. However, | |
34 | the interface allows other dataflow problems to be defined as well. | |
35 | ||
6fb5fa3c DB |
36 | Dataflow analysis is available in most of the rtl backend (the parts |
37 | between pass_df_initialize and pass_df_finish). It is quite likely | |
38 | that these boundaries will be expanded in the future. The only | |
39 | requirement is that there be a correct control flow graph. | |
4d779342 | 40 | |
6fb5fa3c DB |
41 | There are three variations of the live variable problem that are |
42 | available whenever dataflow is available. The LR problem finds the | |
43 | areas that can reach a use of a variable, the UR problems finds the | |
fa10beec | 44 | areas that can be reached from a definition of a variable. The LIVE |
b8698a0f | 45 | problem finds the intersection of these two areas. |
4d779342 | 46 | |
6fb5fa3c DB |
47 | There are several optional problems. These can be enabled when they |
48 | are needed and disabled when they are not needed. | |
4d779342 | 49 | |
6fb5fa3c DB |
50 | Dataflow problems are generally solved in three layers. The bottom |
51 | layer is called scanning where a data structure is built for each rtl | |
52 | insn that describes the set of defs and uses of that insn. Scanning | |
53 | is generally kept up to date, i.e. as the insns changes, the scanned | |
54 | version of that insn changes also. There are various mechanisms for | |
55 | making this happen and are described in the INCREMENTAL SCANNING | |
56 | section. | |
4d779342 | 57 | |
6fb5fa3c | 58 | In the middle layer, basic blocks are scanned to produce transfer |
fa10beec | 59 | functions which describe the effects of that block on the global |
6fb5fa3c | 60 | dataflow solution. The transfer functions are only rebuilt if the |
b8698a0f | 61 | some instruction within the block has changed. |
4d779342 | 62 | |
6fb5fa3c | 63 | The top layer is the dataflow solution itself. The dataflow solution |
0d52bcc1 | 64 | is computed by using an efficient iterative solver and the transfer |
6fb5fa3c DB |
65 | functions. The dataflow solution must be recomputed whenever the |
66 | control changes or if one of the transfer function changes. | |
4d779342 DB |
67 | |
68 | ||
6fb5fa3c | 69 | USAGE: |
4d779342 | 70 | |
6fb5fa3c | 71 | Here is an example of using the dataflow routines. |
4d779342 | 72 | |
05c219bb | 73 | df_[chain,live,note,rd]_add_problem (flags); |
4d779342 | 74 | |
6fb5fa3c | 75 | df_set_blocks (blocks); |
4d779342 | 76 | |
6fb5fa3c | 77 | df_analyze (); |
4d779342 | 78 | |
6fb5fa3c | 79 | df_dump (stderr); |
4d779342 | 80 | |
0d475361 | 81 | df_finish_pass (false); |
4d779342 | 82 | |
05c219bb | 83 | DF_[chain,live,note,rd]_ADD_PROBLEM adds a problem, defined by an |
6fb5fa3c DB |
84 | instance to struct df_problem, to the set of problems solved in this |
85 | instance of df. All calls to add a problem for a given instance of df | |
86 | must occur before the first call to DF_ANALYZE. | |
4d779342 DB |
87 | |
88 | Problems can be dependent on other problems. For instance, solving | |
d1c78882 | 89 | def-use or use-def chains is dependent on solving reaching |
c0220ea4 | 90 | definitions. As long as these dependencies are listed in the problem |
4d779342 DB |
91 | definition, the order of adding the problems is not material. |
92 | Otherwise, the problems will be solved in the order of calls to | |
93 | df_add_problem. Note that it is not necessary to have a problem. In | |
94 | that case, df will just be used to do the scanning. | |
95 | ||
96 | ||
97 | ||
98 | DF_SET_BLOCKS is an optional call used to define a region of the | |
99 | function on which the analysis will be performed. The normal case is | |
100 | to analyze the entire function and no call to df_set_blocks is made. | |
6fb5fa3c DB |
101 | DF_SET_BLOCKS only effects the blocks that are effected when computing |
102 | the transfer functions and final solution. The insn level information | |
103 | is always kept up to date. | |
4d779342 DB |
104 | |
105 | When a subset is given, the analysis behaves as if the function only | |
106 | contains those blocks and any edges that occur directly between the | |
107 | blocks in the set. Care should be taken to call df_set_blocks right | |
c0220ea4 | 108 | before the call to analyze in order to eliminate the possibility that |
4d779342 DB |
109 | optimizations that reorder blocks invalidate the bitvector. |
110 | ||
6fb5fa3c DB |
111 | DF_ANALYZE causes all of the defined problems to be (re)solved. When |
112 | DF_ANALYZE is completes, the IN and OUT sets for each basic block | |
113 | contain the computer information. The DF_*_BB_INFO macros can be used | |
0a41f3b2 | 114 | to access these bitvectors. All deferred rescannings are down before |
0d52bcc1 | 115 | the transfer functions are recomputed. |
4d779342 DB |
116 | |
117 | DF_DUMP can then be called to dump the information produce to some | |
6fb5fa3c DB |
118 | file. This calls DF_DUMP_START, to print the information that is not |
119 | basic block specific, and then calls DF_DUMP_TOP and DF_DUMP_BOTTOM | |
120 | for each block to print the basic specific information. These parts | |
121 | can all be called separately as part of a larger dump function. | |
122 | ||
123 | ||
124 | DF_FINISH_PASS causes df_remove_problem to be called on all of the | |
125 | optional problems. It also causes any insns whose scanning has been | |
0a41f3b2 | 126 | deferred to be rescanned as well as clears all of the changeable flags. |
6fb5fa3c DB |
127 | Setting the pass manager TODO_df_finish flag causes this function to |
128 | be run. However, the pass manager will call df_finish_pass AFTER the | |
129 | pass dumping has been done, so if you want to see the results of the | |
130 | optional problems in the pass dumps, use the TODO flag rather than | |
131 | calling the function yourself. | |
132 | ||
133 | INCREMENTAL SCANNING | |
134 | ||
135 | There are four ways of doing the incremental scanning: | |
136 | ||
137 | 1) Immediate rescanning - Calls to df_insn_rescan, df_notes_rescan, | |
138 | df_bb_delete, df_insn_change_bb have been added to most of | |
139 | the low level service functions that maintain the cfg and change | |
140 | rtl. Calling and of these routines many cause some number of insns | |
141 | to be rescanned. | |
142 | ||
143 | For most modern rtl passes, this is certainly the easiest way to | |
144 | manage rescanning the insns. This technique also has the advantage | |
145 | that the scanning information is always correct and can be relied | |
cea618ac | 146 | upon even after changes have been made to the instructions. This |
6fb5fa3c DB |
147 | technique is contra indicated in several cases: |
148 | ||
149 | a) If def-use chains OR use-def chains (but not both) are built, | |
150 | using this is SIMPLY WRONG. The problem is that when a ref is | |
151 | deleted that is the target of an edge, there is not enough | |
152 | information to efficiently find the source of the edge and | |
153 | delete the edge. This leaves a dangling reference that may | |
154 | cause problems. | |
155 | ||
156 | b) If def-use chains AND use-def chains are built, this may | |
157 | produce unexpected results. The problem is that the incremental | |
158 | scanning of an insn does not know how to repair the chains that | |
159 | point into an insn when the insn changes. So the incremental | |
160 | scanning just deletes the chains that enter and exit the insn | |
161 | being changed. The dangling reference issue in (a) is not a | |
162 | problem here, but if the pass is depending on the chains being | |
163 | maintained after insns have been modified, this technique will | |
164 | not do the correct thing. | |
165 | ||
166 | c) If the pass modifies insns several times, this incremental | |
167 | updating may be expensive. | |
168 | ||
169 | d) If the pass modifies all of the insns, as does register | |
170 | allocation, it is simply better to rescan the entire function. | |
171 | ||
0d52bcc1 | 172 | 2) Deferred rescanning - Calls to df_insn_rescan, df_notes_rescan, and |
6fb5fa3c DB |
173 | df_insn_delete do not immediately change the insn but instead make |
174 | a note that the insn needs to be rescanned. The next call to | |
175 | df_analyze, df_finish_pass, or df_process_deferred_rescans will | |
176 | cause all of the pending rescans to be processed. | |
177 | ||
178 | This is the technique of choice if either 1a, 1b, or 1c are issues | |
ecb7f6de PB |
179 | in the pass. In the case of 1a or 1b, a call to df_finish_pass |
180 | (either manually or via TODO_df_finish) should be made before the | |
181 | next call to df_analyze or df_process_deferred_rescans. | |
182 | ||
183 | This mode is also used by a few passes that still rely on note_uses, | |
e02101ff | 184 | note_stores and rtx iterators instead of using the DF data. This |
ecb7f6de | 185 | can be said to fall under case 1c. |
6fb5fa3c DB |
186 | |
187 | To enable this mode, call df_set_flags (DF_DEFER_INSN_RESCAN). | |
188 | (This mode can be cleared by calling df_clear_flags | |
0a41f3b2 | 189 | (DF_DEFER_INSN_RESCAN) but this does not cause the deferred insns to |
6fb5fa3c DB |
190 | be rescanned. |
191 | ||
ecb7f6de PB |
192 | 3) Total rescanning - In this mode the rescanning is disabled. |
193 | Only when insns are deleted is the df information associated with | |
194 | it also deleted. At the end of the pass, a call must be made to | |
195 | df_insn_rescan_all. This method is used by the register allocator | |
196 | since it generally changes each insn multiple times (once for each ref) | |
197 | and does not need to make use of the updated scanning information. | |
6fb5fa3c DB |
198 | |
199 | 4) Do it yourself - In this mechanism, the pass updates the insns | |
6ed3da00 | 200 | itself using the low level df primitives. Currently no pass does |
6fb5fa3c | 201 | this, but it has the advantage that it is quite efficient given |
b8698a0f | 202 | that the pass generally has exact knowledge of what it is changing. |
6fb5fa3c DB |
203 | |
204 | DATA STRUCTURES | |
4d779342 DB |
205 | |
206 | Scanning produces a `struct df_ref' data structure (ref) is allocated | |
207 | for every register reference (def or use) and this records the insn | |
208 | and bb the ref is found within. The refs are linked together in | |
209 | chains of uses and defs for each insn and for each register. Each ref | |
210 | also has a chain field that links all the use refs for a def or all | |
211 | the def refs for a use. This is used to create use-def or def-use | |
212 | chains. | |
213 | ||
214 | Different optimizations have different needs. Ultimately, only | |
215 | register allocation and schedulers should be using the bitmaps | |
216 | produced for the live register and uninitialized register problems. | |
217 | The rest of the backend should be upgraded to using and maintaining | |
218 | the linked information such as def use or use def chains. | |
219 | ||
220 | ||
4d779342 DB |
221 | PHILOSOPHY: |
222 | ||
223 | While incremental bitmaps are not worthwhile to maintain, incremental | |
224 | chains may be perfectly reasonable. The fastest way to build chains | |
225 | from scratch or after significant modifications is to build reaching | |
226 | definitions (RD) and build the chains from this. | |
227 | ||
228 | However, general algorithms for maintaining use-def or def-use chains | |
229 | are not practical. The amount of work to recompute the chain any | |
230 | chain after an arbitrary change is large. However, with a modest | |
231 | amount of work it is generally possible to have the application that | |
232 | uses the chains keep them up to date. The high level knowledge of | |
233 | what is really happening is essential to crafting efficient | |
234 | incremental algorithms. | |
235 | ||
236 | As for the bit vector problems, there is no interface to give a set of | |
237 | blocks over with to resolve the iteration. In general, restarting a | |
238 | dataflow iteration is difficult and expensive. Again, the best way to | |
6fc0bb99 | 239 | keep the dataflow information up to data (if this is really what is |
4d779342 DB |
240 | needed) it to formulate a problem specific solution. |
241 | ||
242 | There are fine grained calls for creating and deleting references from | |
243 | instructions in df-scan.c. However, these are not currently connected | |
244 | to the engine that resolves the dataflow equations. | |
245 | ||
246 | ||
247 | DATA STRUCTURES: | |
248 | ||
b8698a0f | 249 | The basic object is a DF_REF (reference) and this may either be a |
4d779342 DB |
250 | DEF (definition) or a USE of a register. |
251 | ||
252 | These are linked into a variety of lists; namely reg-def, reg-use, | |
253 | insn-def, insn-use, def-use, and use-def lists. For example, the | |
254 | reg-def lists contain all the locations that define a given register | |
255 | while the insn-use lists contain all the locations that use a | |
256 | register. | |
257 | ||
258 | Note that the reg-def and reg-use chains are generally short for | |
259 | pseudos and long for the hard registers. | |
260 | ||
6fb5fa3c DB |
261 | ACCESSING INSNS: |
262 | ||
50e94c7e SB |
263 | 1) The df insn information is kept in an array of DF_INSN_INFO objects. |
264 | The array is indexed by insn uid, and every DF_REF points to the | |
265 | DF_INSN_INFO object of the insn that contains the reference. | |
266 | ||
267 | 2) Each insn has three sets of refs, which are linked into one of three | |
268 | lists: The insn's defs list (accessed by the DF_INSN_INFO_DEFS, | |
269 | DF_INSN_DEFS, or DF_INSN_UID_DEFS macros), the insn's uses list | |
270 | (accessed by the DF_INSN_INFO_USES, DF_INSN_USES, or | |
271 | DF_INSN_UID_USES macros) or the insn's eq_uses list (accessed by the | |
272 | DF_INSN_INFO_EQ_USES, DF_INSN_EQ_USES or DF_INSN_UID_EQ_USES macros). | |
273 | The latter list are the list of references in REG_EQUAL or REG_EQUIV | |
274 | notes. These macros produce a ref (or NULL), the rest of the list | |
275 | can be obtained by traversal of the NEXT_REF field (accessed by the | |
276 | DF_REF_NEXT_REF macro.) There is no significance to the ordering of | |
277 | the uses or refs in an instruction. | |
278 | ||
279 | 3) Each insn has a logical uid field (LUID) which is stored in the | |
280 | DF_INSN_INFO object for the insn. The LUID field is accessed by | |
281 | the DF_INSN_INFO_LUID, DF_INSN_LUID, and DF_INSN_UID_LUID macros. | |
282 | When properly set, the LUID is an integer that numbers each insn in | |
283 | the basic block, in order from the start of the block. | |
284 | The numbers are only correct after a call to df_analyze. They will | |
285 | rot after insns are added deleted or moved round. | |
6fb5fa3c | 286 | |
4d779342 DB |
287 | ACCESSING REFS: |
288 | ||
289 | There are 4 ways to obtain access to refs: | |
290 | ||
291 | 1) References are divided into two categories, REAL and ARTIFICIAL. | |
292 | ||
b8698a0f | 293 | REAL refs are associated with instructions. |
4d779342 DB |
294 | |
295 | ARTIFICIAL refs are associated with basic blocks. The heads of | |
6fb5fa3c | 296 | these lists can be accessed by calling df_get_artificial_defs or |
b8698a0f L |
297 | df_get_artificial_uses for the particular basic block. |
298 | ||
912f2dac DB |
299 | Artificial defs and uses occur both at the beginning and ends of blocks. |
300 | ||
301 | For blocks that area at the destination of eh edges, the | |
302 | artificial uses and defs occur at the beginning. The defs relate | |
303 | to the registers specified in EH_RETURN_DATA_REGNO and the uses | |
304 | relate to the registers specified in ED_USES. Logically these | |
305 | defs and uses should really occur along the eh edge, but there is | |
306 | no convenient way to do this. Artificial edges that occur at the | |
307 | beginning of the block have the DF_REF_AT_TOP flag set. | |
308 | ||
309 | Artificial uses occur at the end of all blocks. These arise from | |
310 | the hard registers that are always live, such as the stack | |
311 | register and are put there to keep the code from forgetting about | |
312 | them. | |
313 | ||
c0220ea4 | 314 | Artificial defs occur at the end of the entry block. These arise |
912f2dac | 315 | from registers that are live at entry to the function. |
4d779342 | 316 | |
b8698a0f | 317 | 2) There are three types of refs: defs, uses and eq_uses. (Eq_uses are |
6fb5fa3c | 318 | uses that appear inside a REG_EQUAL or REG_EQUIV note.) |
4d779342 | 319 | |
6fb5fa3c DB |
320 | All of the eq_uses, uses and defs associated with each pseudo or |
321 | hard register may be linked in a bidirectional chain. These are | |
322 | called reg-use or reg_def chains. If the changeable flag | |
323 | DF_EQ_NOTES is set when the chains are built, the eq_uses will be | |
b8698a0f | 324 | treated like uses. If it is not set they are ignored. |
6fb5fa3c DB |
325 | |
326 | The first use, eq_use or def for a register can be obtained using | |
327 | the DF_REG_USE_CHAIN, DF_REG_EQ_USE_CHAIN or DF_REG_DEF_CHAIN | |
328 | macros. Subsequent uses for the same regno can be obtained by | |
329 | following the next_reg field of the ref. The number of elements in | |
330 | each of the chains can be found by using the DF_REG_USE_COUNT, | |
331 | DF_REG_EQ_USE_COUNT or DF_REG_DEF_COUNT macros. | |
4d779342 DB |
332 | |
333 | In previous versions of this code, these chains were ordered. It | |
334 | has not been practical to continue this practice. | |
335 | ||
336 | 3) If def-use or use-def chains are built, these can be traversed to | |
6fb5fa3c DB |
337 | get to other refs. If the flag DF_EQ_NOTES has been set, the chains |
338 | include the eq_uses. Otherwise these are ignored when building the | |
339 | chains. | |
4d779342 DB |
340 | |
341 | 4) An array of all of the uses (and an array of all of the defs) can | |
342 | be built. These arrays are indexed by the value in the id | |
343 | structure. These arrays are only lazily kept up to date, and that | |
344 | process can be expensive. To have these arrays built, call | |
6fb5fa3c DB |
345 | df_reorganize_defs or df_reorganize_uses. If the flag DF_EQ_NOTES |
346 | has been set the array will contain the eq_uses. Otherwise these | |
347 | are ignored when building the array and assigning the ids. Note | |
348 | that the values in the id field of a ref may change across calls to | |
b8698a0f | 349 | df_analyze or df_reorganize_defs or df_reorganize_uses. |
4d779342 DB |
350 | |
351 | If the only use of this array is to find all of the refs, it is | |
352 | better to traverse all of the registers and then traverse all of | |
353 | reg-use or reg-def chains. | |
354 | ||
4d779342 | 355 | NOTES: |
b8698a0f | 356 | |
4d779342 DB |
357 | Embedded addressing side-effects, such as POST_INC or PRE_INC, generate |
358 | both a use and a def. These are both marked read/write to show that they | |
359 | are dependent. For example, (set (reg 40) (mem (post_inc (reg 42)))) | |
360 | will generate a use of reg 42 followed by a def of reg 42 (both marked | |
361 | read/write). Similarly, (set (reg 40) (mem (pre_dec (reg 41)))) | |
362 | generates a use of reg 41 then a def of reg 41 (both marked read/write), | |
363 | even though reg 41 is decremented before it is used for the memory | |
364 | address in this second example. | |
365 | ||
366 | A set to a REG inside a ZERO_EXTRACT, or a set to a non-paradoxical SUBREG | |
367 | for which the number of word_mode units covered by the outer mode is | |
fa10beec | 368 | smaller than that covered by the inner mode, invokes a read-modify-write |
4d779342 DB |
369 | operation. We generate both a use and a def and again mark them |
370 | read/write. | |
371 | ||
372 | Paradoxical subreg writes do not leave a trace of the old content, so they | |
b8698a0f | 373 | are write-only operations. |
4d779342 DB |
374 | */ |
375 | ||
376 | ||
377 | #include "config.h" | |
378 | #include "system.h" | |
379 | #include "coretypes.h" | |
c7131fb2 | 380 | #include "backend.h" |
4d779342 | 381 | #include "rtl.h" |
c7131fb2 | 382 | #include "df.h" |
4d0cdd0c | 383 | #include "memmodel.h" |
957060b5 | 384 | #include "emit-rtl.h" |
60393bbc | 385 | #include "cfganal.h" |
4d779342 | 386 | #include "tree-pass.h" |
7be64667 | 387 | #include "cfgloop.h" |
4d779342 | 388 | |
23249ac4 | 389 | static void *df_get_bb_info (struct dataflow *, unsigned int); |
30cb87a0 | 390 | static void df_set_bb_info (struct dataflow *, unsigned int, void *); |
e285df08 | 391 | static void df_clear_bb_info (struct dataflow *, unsigned int); |
6fb5fa3c DB |
392 | #ifdef DF_DEBUG_CFG |
393 | static void df_set_clean_cfg (void); | |
394 | #endif | |
4d779342 | 395 | |
532aafad SB |
396 | /* The obstack on which regsets are allocated. */ |
397 | struct bitmap_obstack reg_obstack; | |
398 | ||
6fb5fa3c DB |
399 | /* An obstack for bitmap not related to specific dataflow problems. |
400 | This obstack should e.g. be used for bitmaps with a short life time | |
401 | such as temporary bitmaps. */ | |
4d779342 | 402 | |
6fb5fa3c | 403 | bitmap_obstack df_bitmap_obstack; |
4d779342 | 404 | |
4d779342 | 405 | |
6fb5fa3c DB |
406 | /*---------------------------------------------------------------------------- |
407 | Functions to create, destroy and manipulate an instance of df. | |
408 | ----------------------------------------------------------------------------*/ | |
409 | ||
f12c802a | 410 | struct df_d *df; |
4d779342 | 411 | |
6fb5fa3c | 412 | /* Add PROBLEM (and any dependent problems) to the DF instance. */ |
4d779342 | 413 | |
6fb5fa3c | 414 | void |
fdd5680c | 415 | df_add_problem (const struct df_problem *problem) |
4d779342 DB |
416 | { |
417 | struct dataflow *dflow; | |
6fb5fa3c | 418 | int i; |
4d779342 DB |
419 | |
420 | /* First try to add the dependent problem. */ | |
6fb5fa3c DB |
421 | if (problem->dependent_problem) |
422 | df_add_problem (problem->dependent_problem); | |
4d779342 DB |
423 | |
424 | /* Check to see if this problem has already been defined. If it | |
425 | has, just return that instance, if not, add it to the end of the | |
426 | vector. */ | |
427 | dflow = df->problems_by_index[problem->id]; | |
428 | if (dflow) | |
6fb5fa3c | 429 | return; |
4d779342 DB |
430 | |
431 | /* Make a new one and add it to the end. */ | |
5ed6ace5 | 432 | dflow = XCNEW (struct dataflow); |
4d779342 | 433 | dflow->problem = problem; |
6fb5fa3c DB |
434 | dflow->computed = false; |
435 | dflow->solutions_dirty = true; | |
4d779342 DB |
436 | df->problems_by_index[dflow->problem->id] = dflow; |
437 | ||
6fb5fa3c DB |
438 | /* Keep the defined problems ordered by index. This solves the |
439 | problem that RI will use the information from UREC if UREC has | |
440 | been defined, or from LIVE if LIVE is defined and otherwise LR. | |
441 | However for this to work, the computation of RI must be pushed | |
442 | after which ever of those problems is defined, but we do not | |
443 | require any of those except for LR to have actually been | |
b8698a0f | 444 | defined. */ |
6fb5fa3c DB |
445 | df->num_problems_defined++; |
446 | for (i = df->num_problems_defined - 2; i >= 0; i--) | |
447 | { | |
448 | if (problem->id < df->problems_in_order[i]->problem->id) | |
449 | df->problems_in_order[i+1] = df->problems_in_order[i]; | |
450 | else | |
451 | { | |
452 | df->problems_in_order[i+1] = dflow; | |
453 | return; | |
454 | } | |
455 | } | |
456 | df->problems_in_order[0] = dflow; | |
4d779342 DB |
457 | } |
458 | ||
459 | ||
23249ac4 DB |
460 | /* Set the MASK flags in the DFLOW problem. The old flags are |
461 | returned. If a flag is not allowed to be changed this will fail if | |
462 | checking is enabled. */ | |
81f40b79 | 463 | int |
bbbbb16a | 464 | df_set_flags (int changeable_flags) |
23249ac4 | 465 | { |
81f40b79 | 466 | int old_flags = df->changeable_flags; |
6fb5fa3c | 467 | df->changeable_flags |= changeable_flags; |
23249ac4 DB |
468 | return old_flags; |
469 | } | |
470 | ||
6fb5fa3c | 471 | |
23249ac4 DB |
472 | /* Clear the MASK flags in the DFLOW problem. The old flags are |
473 | returned. If a flag is not allowed to be changed this will fail if | |
474 | checking is enabled. */ | |
81f40b79 | 475 | int |
bbbbb16a | 476 | df_clear_flags (int changeable_flags) |
23249ac4 | 477 | { |
81f40b79 | 478 | int old_flags = df->changeable_flags; |
6fb5fa3c | 479 | df->changeable_flags &= ~changeable_flags; |
23249ac4 DB |
480 | return old_flags; |
481 | } | |
482 | ||
6fb5fa3c | 483 | |
4d779342 DB |
484 | /* Set the blocks that are to be considered for analysis. If this is |
485 | not called or is called with null, the entire function in | |
486 | analyzed. */ | |
487 | ||
b8698a0f | 488 | void |
6fb5fa3c | 489 | df_set_blocks (bitmap blocks) |
4d779342 DB |
490 | { |
491 | if (blocks) | |
492 | { | |
6fb5fa3c DB |
493 | if (dump_file) |
494 | bitmap_print (dump_file, blocks, "setting blocks to analyze ", "\n"); | |
3b8266e2 KZ |
495 | if (df->blocks_to_analyze) |
496 | { | |
89a95777 KZ |
497 | /* This block is called to change the focus from one subset |
498 | to another. */ | |
3b8266e2 | 499 | int p; |
d648b5ff TS |
500 | auto_bitmap diff (&df_bitmap_obstack); |
501 | bitmap_and_compl (diff, df->blocks_to_analyze, blocks); | |
89a95777 | 502 | for (p = 0; p < df->num_problems_defined; p++) |
3b8266e2 KZ |
503 | { |
504 | struct dataflow *dflow = df->problems_in_order[p]; | |
89a95777 | 505 | if (dflow->optional_p && dflow->problem->reset_fun) |
6fb5fa3c | 506 | dflow->problem->reset_fun (df->blocks_to_analyze); |
89a95777 | 507 | else if (dflow->problem->free_blocks_on_set_blocks) |
3b8266e2 KZ |
508 | { |
509 | bitmap_iterator bi; | |
510 | unsigned int bb_index; | |
b8698a0f | 511 | |
d648b5ff | 512 | EXECUTE_IF_SET_IN_BITMAP (diff, 0, bb_index, bi) |
3b8266e2 | 513 | { |
06e28de2 | 514 | basic_block bb = BASIC_BLOCK_FOR_FN (cfun, bb_index); |
30cb87a0 KZ |
515 | if (bb) |
516 | { | |
6fb5fa3c | 517 | void *bb_info = df_get_bb_info (dflow, bb_index); |
e285df08 JH |
518 | dflow->problem->free_bb_fun (bb, bb_info); |
519 | df_clear_bb_info (dflow, bb_index); | |
30cb87a0 | 520 | } |
3b8266e2 KZ |
521 | } |
522 | } | |
523 | } | |
3b8266e2 KZ |
524 | } |
525 | else | |
30cb87a0 | 526 | { |
89a95777 KZ |
527 | /* This block of code is executed to change the focus from |
528 | the entire function to a subset. */ | |
a7e3698d JH |
529 | bitmap_head blocks_to_reset; |
530 | bool initialized = false; | |
89a95777 KZ |
531 | int p; |
532 | for (p = 0; p < df->num_problems_defined; p++) | |
30cb87a0 | 533 | { |
89a95777 KZ |
534 | struct dataflow *dflow = df->problems_in_order[p]; |
535 | if (dflow->optional_p && dflow->problem->reset_fun) | |
30cb87a0 | 536 | { |
a7e3698d | 537 | if (!initialized) |
30cb87a0 | 538 | { |
89a95777 | 539 | basic_block bb; |
a7e3698d | 540 | bitmap_initialize (&blocks_to_reset, &df_bitmap_obstack); |
04a90bec | 541 | FOR_ALL_BB_FN (bb, cfun) |
30cb87a0 | 542 | { |
a7e3698d | 543 | bitmap_set_bit (&blocks_to_reset, bb->index); |
30cb87a0 | 544 | } |
30cb87a0 | 545 | } |
a7e3698d | 546 | dflow->problem->reset_fun (&blocks_to_reset); |
30cb87a0 | 547 | } |
30cb87a0 | 548 | } |
a7e3698d JH |
549 | if (initialized) |
550 | bitmap_clear (&blocks_to_reset); | |
89a95777 | 551 | |
6fb5fa3c | 552 | df->blocks_to_analyze = BITMAP_ALLOC (&df_bitmap_obstack); |
30cb87a0 | 553 | } |
4d779342 | 554 | bitmap_copy (df->blocks_to_analyze, blocks); |
6fb5fa3c | 555 | df->analyze_subset = true; |
4d779342 DB |
556 | } |
557 | else | |
558 | { | |
89a95777 KZ |
559 | /* This block is executed to reset the focus to the entire |
560 | function. */ | |
6fb5fa3c | 561 | if (dump_file) |
89a95777 | 562 | fprintf (dump_file, "clearing blocks_to_analyze\n"); |
4d779342 DB |
563 | if (df->blocks_to_analyze) |
564 | { | |
565 | BITMAP_FREE (df->blocks_to_analyze); | |
566 | df->blocks_to_analyze = NULL; | |
567 | } | |
6fb5fa3c | 568 | df->analyze_subset = false; |
4d779342 | 569 | } |
6fb5fa3c DB |
570 | |
571 | /* Setting the blocks causes the refs to be unorganized since only | |
572 | the refs in the blocks are seen. */ | |
573 | df_maybe_reorganize_def_refs (DF_REF_ORDER_NO_TABLE); | |
574 | df_maybe_reorganize_use_refs (DF_REF_ORDER_NO_TABLE); | |
575 | df_mark_solutions_dirty (); | |
4d779342 DB |
576 | } |
577 | ||
578 | ||
6fb5fa3c DB |
579 | /* Delete a DFLOW problem (and any problems that depend on this |
580 | problem). */ | |
23249ac4 DB |
581 | |
582 | void | |
6fb5fa3c | 583 | df_remove_problem (struct dataflow *dflow) |
23249ac4 | 584 | { |
fdd5680c | 585 | const struct df_problem *problem; |
23249ac4 | 586 | int i; |
6fb5fa3c DB |
587 | |
588 | if (!dflow) | |
589 | return; | |
590 | ||
591 | problem = dflow->problem; | |
592 | gcc_assert (problem->remove_problem_fun); | |
593 | ||
6fb5fa3c | 594 | /* Delete any problems that depended on this problem first. */ |
89a95777 | 595 | for (i = 0; i < df->num_problems_defined; i++) |
6fb5fa3c DB |
596 | if (df->problems_in_order[i]->problem->dependent_problem == problem) |
597 | df_remove_problem (df->problems_in_order[i]); | |
598 | ||
599 | /* Now remove this problem. */ | |
89a95777 | 600 | for (i = 0; i < df->num_problems_defined; i++) |
6fb5fa3c DB |
601 | if (df->problems_in_order[i] == dflow) |
602 | { | |
603 | int j; | |
604 | for (j = i + 1; j < df->num_problems_defined; j++) | |
605 | df->problems_in_order[j-1] = df->problems_in_order[j]; | |
7039a415 | 606 | df->problems_in_order[j-1] = NULL; |
6fb5fa3c DB |
607 | df->num_problems_defined--; |
608 | break; | |
609 | } | |
610 | ||
611 | (problem->remove_problem_fun) (); | |
612 | df->problems_by_index[problem->id] = NULL; | |
613 | } | |
614 | ||
615 | ||
05c219bb PB |
616 | /* Remove all of the problems that are not permanent. Scanning, LR |
617 | and (at -O2 or higher) LIVE are permanent, the rest are removable. | |
618 | Also clear all of the changeable_flags. */ | |
6fb5fa3c DB |
619 | |
620 | void | |
0d475361 | 621 | df_finish_pass (bool verify ATTRIBUTE_UNUSED) |
6fb5fa3c DB |
622 | { |
623 | int i; | |
6fb5fa3c | 624 | |
3089f8b5 | 625 | #ifdef ENABLE_DF_CHECKING |
a46edbff | 626 | int saved_flags; |
6fb5fa3c DB |
627 | #endif |
628 | ||
629 | if (!df) | |
630 | return; | |
631 | ||
632 | df_maybe_reorganize_def_refs (DF_REF_ORDER_NO_TABLE); | |
633 | df_maybe_reorganize_use_refs (DF_REF_ORDER_NO_TABLE); | |
634 | ||
3089f8b5 | 635 | #ifdef ENABLE_DF_CHECKING |
6fb5fa3c DB |
636 | saved_flags = df->changeable_flags; |
637 | #endif | |
638 | ||
8f252203 TP |
639 | /* We iterate over problems by index as each problem removed will |
640 | lead to problems_in_order to be reordered. */ | |
641 | for (i = 0; i < DF_LAST_PROBLEM_PLUS1; i++) | |
23249ac4 | 642 | { |
8f252203 | 643 | struct dataflow *dflow = df->problems_by_index[i]; |
6fb5fa3c | 644 | |
8f252203 TP |
645 | if (dflow && dflow->optional_p) |
646 | df_remove_problem (dflow); | |
6fb5fa3c | 647 | } |
6fb5fa3c DB |
648 | |
649 | /* Clear all of the flags. */ | |
650 | df->changeable_flags = 0; | |
651 | df_process_deferred_rescans (); | |
652 | ||
653 | /* Set the focus back to the whole function. */ | |
654 | if (df->blocks_to_analyze) | |
655 | { | |
656 | BITMAP_FREE (df->blocks_to_analyze); | |
657 | df->blocks_to_analyze = NULL; | |
658 | df_mark_solutions_dirty (); | |
659 | df->analyze_subset = false; | |
23249ac4 | 660 | } |
6fb5fa3c | 661 | |
3089f8b5 | 662 | #ifdef ENABLE_DF_CHECKING |
6fb5fa3c DB |
663 | /* Verification will fail in DF_NO_INSN_RESCAN. */ |
664 | if (!(saved_flags & DF_NO_INSN_RESCAN)) | |
665 | { | |
666 | df_lr_verify_transfer_functions (); | |
667 | if (df_live) | |
668 | df_live_verify_transfer_functions (); | |
669 | } | |
670 | ||
671 | #ifdef DF_DEBUG_CFG | |
672 | df_set_clean_cfg (); | |
673 | #endif | |
674 | #endif | |
0d475361 | 675 | |
b2b29377 | 676 | if (flag_checking && verify) |
0d475361 | 677 | df->changeable_flags |= DF_VERIFY_SCHEDULED; |
6fb5fa3c DB |
678 | } |
679 | ||
680 | ||
681 | /* Set up the dataflow instance for the entire back end. */ | |
682 | ||
683 | static unsigned int | |
684 | rest_of_handle_df_initialize (void) | |
685 | { | |
686 | gcc_assert (!df); | |
f12c802a | 687 | df = XCNEW (struct df_d); |
6fb5fa3c DB |
688 | df->changeable_flags = 0; |
689 | ||
690 | bitmap_obstack_initialize (&df_bitmap_obstack); | |
691 | ||
692 | /* Set this to a conservative value. Stack_ptr_mod will compute it | |
693 | correctly later. */ | |
416ff32e | 694 | crtl->sp_is_unchanging = 0; |
6fb5fa3c DB |
695 | |
696 | df_scan_add_problem (); | |
697 | df_scan_alloc (NULL); | |
698 | ||
699 | /* These three problems are permanent. */ | |
700 | df_lr_add_problem (); | |
89a95777 | 701 | if (optimize > 1) |
6fb5fa3c DB |
702 | df_live_add_problem (); |
703 | ||
8b1c6fd7 | 704 | df->postorder = XNEWVEC (int, last_basic_block_for_fn (cfun)); |
6fb5fa3c | 705 | df->n_blocks = post_order_compute (df->postorder, true, true); |
6fa95e09 TS |
706 | inverted_post_order_compute (&df->postorder_inverted); |
707 | gcc_assert ((unsigned) df->n_blocks == df->postorder_inverted.length ()); | |
6fb5fa3c | 708 | |
225ccc68 | 709 | df->hard_regs_live_count = XCNEWVEC (unsigned int, FIRST_PSEUDO_REGISTER); |
6fb5fa3c DB |
710 | |
711 | df_hard_reg_init (); | |
712 | /* After reload, some ports add certain bits to regs_ever_live so | |
713 | this cannot be reset. */ | |
714 | df_compute_regs_ever_live (true); | |
715 | df_scan_blocks (); | |
716 | df_compute_regs_ever_live (false); | |
717 | return 0; | |
718 | } | |
719 | ||
720 | ||
27a4cd48 DM |
721 | namespace { |
722 | ||
723 | const pass_data pass_data_df_initialize_opt = | |
6fb5fa3c | 724 | { |
27a4cd48 DM |
725 | RTL_PASS, /* type */ |
726 | "dfinit", /* name */ | |
727 | OPTGROUP_NONE, /* optinfo_flags */ | |
27a4cd48 DM |
728 | TV_DF_SCAN, /* tv_id */ |
729 | 0, /* properties_required */ | |
730 | 0, /* properties_provided */ | |
731 | 0, /* properties_destroyed */ | |
732 | 0, /* todo_flags_start */ | |
733 | 0, /* todo_flags_finish */ | |
6fb5fa3c DB |
734 | }; |
735 | ||
27a4cd48 DM |
736 | class pass_df_initialize_opt : public rtl_opt_pass |
737 | { | |
738 | public: | |
c3284718 RS |
739 | pass_df_initialize_opt (gcc::context *ctxt) |
740 | : rtl_opt_pass (pass_data_df_initialize_opt, ctxt) | |
27a4cd48 DM |
741 | {} |
742 | ||
743 | /* opt_pass methods: */ | |
1a3d085c | 744 | virtual bool gate (function *) { return optimize > 0; } |
be55bfe6 TS |
745 | virtual unsigned int execute (function *) |
746 | { | |
747 | return rest_of_handle_df_initialize (); | |
748 | } | |
27a4cd48 DM |
749 | |
750 | }; // class pass_df_initialize_opt | |
751 | ||
752 | } // anon namespace | |
753 | ||
754 | rtl_opt_pass * | |
755 | make_pass_df_initialize_opt (gcc::context *ctxt) | |
756 | { | |
757 | return new pass_df_initialize_opt (ctxt); | |
758 | } | |
759 | ||
6fb5fa3c | 760 | |
27a4cd48 DM |
761 | namespace { |
762 | ||
763 | const pass_data pass_data_df_initialize_no_opt = | |
6fb5fa3c | 764 | { |
27a4cd48 DM |
765 | RTL_PASS, /* type */ |
766 | "no-opt dfinit", /* name */ | |
767 | OPTGROUP_NONE, /* optinfo_flags */ | |
27a4cd48 DM |
768 | TV_DF_SCAN, /* tv_id */ |
769 | 0, /* properties_required */ | |
770 | 0, /* properties_provided */ | |
771 | 0, /* properties_destroyed */ | |
772 | 0, /* todo_flags_start */ | |
773 | 0, /* todo_flags_finish */ | |
6fb5fa3c DB |
774 | }; |
775 | ||
27a4cd48 DM |
776 | class pass_df_initialize_no_opt : public rtl_opt_pass |
777 | { | |
778 | public: | |
c3284718 RS |
779 | pass_df_initialize_no_opt (gcc::context *ctxt) |
780 | : rtl_opt_pass (pass_data_df_initialize_no_opt, ctxt) | |
27a4cd48 DM |
781 | {} |
782 | ||
783 | /* opt_pass methods: */ | |
1a3d085c | 784 | virtual bool gate (function *) { return optimize == 0; } |
be55bfe6 TS |
785 | virtual unsigned int execute (function *) |
786 | { | |
787 | return rest_of_handle_df_initialize (); | |
788 | } | |
27a4cd48 DM |
789 | |
790 | }; // class pass_df_initialize_no_opt | |
791 | ||
792 | } // anon namespace | |
793 | ||
794 | rtl_opt_pass * | |
795 | make_pass_df_initialize_no_opt (gcc::context *ctxt) | |
796 | { | |
797 | return new pass_df_initialize_no_opt (ctxt); | |
798 | } | |
799 | ||
6fb5fa3c | 800 | |
4d779342 DB |
801 | /* Free all the dataflow info and the DF structure. This should be |
802 | called from the df_finish macro which also NULLs the parm. */ | |
803 | ||
6fb5fa3c DB |
804 | static unsigned int |
805 | rest_of_handle_df_finish (void) | |
4d779342 DB |
806 | { |
807 | int i; | |
808 | ||
6fb5fa3c DB |
809 | gcc_assert (df); |
810 | ||
4d779342 | 811 | for (i = 0; i < df->num_problems_defined; i++) |
6fb5fa3c DB |
812 | { |
813 | struct dataflow *dflow = df->problems_in_order[i]; | |
b8698a0f | 814 | dflow->problem->free_fun (); |
6fb5fa3c | 815 | } |
4d779342 | 816 | |
04695783 | 817 | free (df->postorder); |
6fa95e09 | 818 | df->postorder_inverted.release (); |
6fb5fa3c | 819 | free (df->hard_regs_live_count); |
4d779342 | 820 | free (df); |
6fb5fa3c DB |
821 | df = NULL; |
822 | ||
823 | bitmap_obstack_release (&df_bitmap_obstack); | |
824 | return 0; | |
4d779342 DB |
825 | } |
826 | ||
6fb5fa3c | 827 | |
27a4cd48 DM |
828 | namespace { |
829 | ||
830 | const pass_data pass_data_df_finish = | |
6fb5fa3c | 831 | { |
27a4cd48 DM |
832 | RTL_PASS, /* type */ |
833 | "dfinish", /* name */ | |
834 | OPTGROUP_NONE, /* optinfo_flags */ | |
27a4cd48 DM |
835 | TV_NONE, /* tv_id */ |
836 | 0, /* properties_required */ | |
837 | 0, /* properties_provided */ | |
838 | 0, /* properties_destroyed */ | |
839 | 0, /* todo_flags_start */ | |
840 | 0, /* todo_flags_finish */ | |
6fb5fa3c DB |
841 | }; |
842 | ||
27a4cd48 DM |
843 | class pass_df_finish : public rtl_opt_pass |
844 | { | |
845 | public: | |
c3284718 RS |
846 | pass_df_finish (gcc::context *ctxt) |
847 | : rtl_opt_pass (pass_data_df_finish, ctxt) | |
27a4cd48 DM |
848 | {} |
849 | ||
850 | /* opt_pass methods: */ | |
be55bfe6 TS |
851 | virtual unsigned int execute (function *) |
852 | { | |
853 | return rest_of_handle_df_finish (); | |
854 | } | |
27a4cd48 DM |
855 | |
856 | }; // class pass_df_finish | |
857 | ||
858 | } // anon namespace | |
859 | ||
860 | rtl_opt_pass * | |
861 | make_pass_df_finish (gcc::context *ctxt) | |
862 | { | |
863 | return new pass_df_finish (ctxt); | |
864 | } | |
865 | ||
6fb5fa3c DB |
866 | |
867 | ||
868 | ||
4d779342 DB |
869 | \f |
870 | /*---------------------------------------------------------------------------- | |
871 | The general data flow analysis engine. | |
872 | ----------------------------------------------------------------------------*/ | |
873 | ||
50b2e859 JH |
874 | /* Return time BB when it was visited for last time. */ |
875 | #define BB_LAST_CHANGE_AGE(bb) ((ptrdiff_t)(bb)->aux) | |
4d779342 | 876 | |
6fb5fa3c | 877 | /* Helper function for df_worklist_dataflow. |
b8698a0f | 878 | Propagate the dataflow forward. |
6fb5fa3c DB |
879 | Given a BB_INDEX, do the dataflow propagation |
880 | and set bits on for successors in PENDING | |
50b2e859 JH |
881 | if the out set of the dataflow has changed. |
882 | ||
883 | AGE specify time when BB was visited last time. | |
884 | AGE of 0 means we are visiting for first time and need to | |
885 | compute transfer function to initialize datastructures. | |
886 | Otherwise we re-do transfer function only if something change | |
887 | while computing confluence functions. | |
888 | We need to compute confluence only of basic block that are younger | |
889 | then last visit of the BB. | |
890 | ||
891 | Return true if BB info has changed. This is always the case | |
892 | in the first visit. */ | |
4d779342 | 893 | |
1a0f3fa1 | 894 | static bool |
6fb5fa3c DB |
895 | df_worklist_propagate_forward (struct dataflow *dataflow, |
896 | unsigned bb_index, | |
897 | unsigned *bbindex_to_postorder, | |
898 | bitmap pending, | |
1a0f3fa1 | 899 | sbitmap considered, |
50b2e859 | 900 | ptrdiff_t age) |
4d779342 | 901 | { |
4d779342 DB |
902 | edge e; |
903 | edge_iterator ei; | |
06e28de2 | 904 | basic_block bb = BASIC_BLOCK_FOR_FN (cfun, bb_index); |
1a0f3fa1 | 905 | bool changed = !age; |
4d779342 | 906 | |
6fb5fa3c | 907 | /* Calculate <conf_op> of incoming edges. */ |
4d779342 DB |
908 | if (EDGE_COUNT (bb->preds) > 0) |
909 | FOR_EACH_EDGE (e, ei, bb->preds) | |
b8698a0f | 910 | { |
50b2e859 | 911 | if (age <= BB_LAST_CHANGE_AGE (e->src) |
d7c028c0 | 912 | && bitmap_bit_p (considered, e->src->index)) |
1a0f3fa1 | 913 | changed |= dataflow->problem->con_fun_n (e); |
b8698a0f | 914 | } |
e45dcf9c | 915 | else if (dataflow->problem->con_fun_0) |
50b2e859 | 916 | dataflow->problem->con_fun_0 (bb); |
6fb5fa3c | 917 | |
1a0f3fa1 JH |
918 | if (changed |
919 | && dataflow->problem->trans_fun (bb_index)) | |
4d779342 | 920 | { |
b8698a0f | 921 | /* The out set of this block has changed. |
6fb5fa3c DB |
922 | Propagate to the outgoing blocks. */ |
923 | FOR_EACH_EDGE (e, ei, bb->succs) | |
924 | { | |
925 | unsigned ob_index = e->dest->index; | |
926 | ||
d7c028c0 | 927 | if (bitmap_bit_p (considered, ob_index)) |
6fb5fa3c DB |
928 | bitmap_set_bit (pending, bbindex_to_postorder[ob_index]); |
929 | } | |
1a0f3fa1 | 930 | return true; |
4d779342 | 931 | } |
1a0f3fa1 | 932 | return false; |
4d779342 DB |
933 | } |
934 | ||
6fb5fa3c DB |
935 | |
936 | /* Helper function for df_worklist_dataflow. | |
937 | Propagate the dataflow backward. */ | |
938 | ||
1a0f3fa1 | 939 | static bool |
6fb5fa3c DB |
940 | df_worklist_propagate_backward (struct dataflow *dataflow, |
941 | unsigned bb_index, | |
942 | unsigned *bbindex_to_postorder, | |
943 | bitmap pending, | |
1a0f3fa1 | 944 | sbitmap considered, |
50b2e859 | 945 | ptrdiff_t age) |
4d779342 | 946 | { |
4d779342 DB |
947 | edge e; |
948 | edge_iterator ei; | |
06e28de2 | 949 | basic_block bb = BASIC_BLOCK_FOR_FN (cfun, bb_index); |
1a0f3fa1 | 950 | bool changed = !age; |
4d779342 | 951 | |
6fb5fa3c | 952 | /* Calculate <conf_op> of incoming edges. */ |
4d779342 | 953 | if (EDGE_COUNT (bb->succs) > 0) |
6fb5fa3c | 954 | FOR_EACH_EDGE (e, ei, bb->succs) |
b8698a0f | 955 | { |
50b2e859 | 956 | if (age <= BB_LAST_CHANGE_AGE (e->dest) |
d7c028c0 | 957 | && bitmap_bit_p (considered, e->dest->index)) |
1a0f3fa1 | 958 | changed |= dataflow->problem->con_fun_n (e); |
b8698a0f | 959 | } |
e45dcf9c | 960 | else if (dataflow->problem->con_fun_0) |
50b2e859 | 961 | dataflow->problem->con_fun_0 (bb); |
4d779342 | 962 | |
1a0f3fa1 JH |
963 | if (changed |
964 | && dataflow->problem->trans_fun (bb_index)) | |
4d779342 | 965 | { |
b8698a0f | 966 | /* The out set of this block has changed. |
6fb5fa3c DB |
967 | Propagate to the outgoing blocks. */ |
968 | FOR_EACH_EDGE (e, ei, bb->preds) | |
969 | { | |
970 | unsigned ob_index = e->src->index; | |
971 | ||
d7c028c0 | 972 | if (bitmap_bit_p (considered, ob_index)) |
6fb5fa3c DB |
973 | bitmap_set_bit (pending, bbindex_to_postorder[ob_index]); |
974 | } | |
1a0f3fa1 | 975 | return true; |
4d779342 | 976 | } |
1a0f3fa1 | 977 | return false; |
4d779342 DB |
978 | } |
979 | ||
50b2e859 JH |
980 | /* Main dataflow solver loop. |
981 | ||
982 | DATAFLOW is problem we are solving, PENDING is worklist of basic blocks we | |
983 | need to visit. | |
984 | BLOCK_IN_POSTORDER is array of size N_BLOCKS specifying postorder in BBs and | |
688010ba | 985 | BBINDEX_TO_POSTORDER is array mapping back BB->index to postorder position. |
50b2e859 JH |
986 | PENDING will be freed. |
987 | ||
988 | The worklists are bitmaps indexed by postorder positions. | |
989 | ||
990 | The function implements standard algorithm for dataflow solving with two | |
991 | worklists (we are processing WORKLIST and storing new BBs to visit in | |
992 | PENDING). | |
185082a7 | 993 | |
50b2e859 JH |
994 | As an optimization we maintain ages when BB was changed (stored in bb->aux) |
995 | and when it was last visited (stored in last_visit_age). This avoids need | |
996 | to re-do confluence function for edges to basic blocks whose source | |
997 | did not change since destination was visited last time. */ | |
185082a7 | 998 | |
b8698a0f | 999 | static void |
185082a7 SP |
1000 | df_worklist_dataflow_doublequeue (struct dataflow *dataflow, |
1001 | bitmap pending, | |
1002 | sbitmap considered, | |
1003 | int *blocks_in_postorder, | |
1a0f3fa1 JH |
1004 | unsigned *bbindex_to_postorder, |
1005 | int n_blocks) | |
185082a7 SP |
1006 | { |
1007 | enum df_flow_dir dir = dataflow->problem->dir; | |
1008 | int dcount = 0; | |
1009 | bitmap worklist = BITMAP_ALLOC (&df_bitmap_obstack); | |
50b2e859 | 1010 | int age = 0; |
1a0f3fa1 | 1011 | bool changed; |
6e1aa848 | 1012 | vec<int> last_visit_age = vNULL; |
50b2e859 | 1013 | int prev_age; |
1a0f3fa1 JH |
1014 | basic_block bb; |
1015 | int i; | |
1016 | ||
9771b263 | 1017 | last_visit_age.safe_grow_cleared (n_blocks); |
185082a7 SP |
1018 | |
1019 | /* Double-queueing. Worklist is for the current iteration, | |
1020 | and pending is for the next. */ | |
1021 | while (!bitmap_empty_p (pending)) | |
1022 | { | |
1a0f3fa1 JH |
1023 | bitmap_iterator bi; |
1024 | unsigned int index; | |
1025 | ||
6b4db501 | 1026 | std::swap (pending, worklist); |
185082a7 | 1027 | |
1a0f3fa1 | 1028 | EXECUTE_IF_SET_IN_BITMAP (worklist, 0, index, bi) |
185082a7 | 1029 | { |
185082a7 SP |
1030 | unsigned bb_index; |
1031 | dcount++; | |
1032 | ||
50b2e859 | 1033 | bitmap_clear_bit (pending, index); |
185082a7 | 1034 | bb_index = blocks_in_postorder[index]; |
06e28de2 | 1035 | bb = BASIC_BLOCK_FOR_FN (cfun, bb_index); |
9771b263 | 1036 | prev_age = last_visit_age[index]; |
185082a7 | 1037 | if (dir == DF_FORWARD) |
1a0f3fa1 JH |
1038 | changed = df_worklist_propagate_forward (dataflow, bb_index, |
1039 | bbindex_to_postorder, | |
1040 | pending, considered, | |
1041 | prev_age); | |
b8698a0f | 1042 | else |
1a0f3fa1 JH |
1043 | changed = df_worklist_propagate_backward (dataflow, bb_index, |
1044 | bbindex_to_postorder, | |
1045 | pending, considered, | |
1046 | prev_age); | |
9771b263 | 1047 | last_visit_age[index] = ++age; |
1a0f3fa1 | 1048 | if (changed) |
50b2e859 | 1049 | bb->aux = (void *)(ptrdiff_t)age; |
185082a7 | 1050 | } |
1a0f3fa1 | 1051 | bitmap_clear (worklist); |
185082a7 | 1052 | } |
1a0f3fa1 | 1053 | for (i = 0; i < n_blocks; i++) |
06e28de2 | 1054 | BASIC_BLOCK_FOR_FN (cfun, blocks_in_postorder[i])->aux = NULL; |
185082a7 SP |
1055 | |
1056 | BITMAP_FREE (worklist); | |
1057 | BITMAP_FREE (pending); | |
9771b263 | 1058 | last_visit_age.release (); |
185082a7 SP |
1059 | |
1060 | /* Dump statistics. */ | |
1061 | if (dump_file) | |
1062 | fprintf (dump_file, "df_worklist_dataflow_doublequeue:" | |
aa326bfb | 1063 | " n_basic_blocks %d n_edges %d" |
185082a7 | 1064 | " count %d (%5.2g)\n", |
dc936fb2 | 1065 | n_basic_blocks_for_fn (cfun), n_edges_for_fn (cfun), |
0cae8d31 | 1066 | dcount, dcount / (float)n_basic_blocks_for_fn (cfun)); |
185082a7 SP |
1067 | } |
1068 | ||
6fb5fa3c | 1069 | /* Worklist-based dataflow solver. It uses sbitmap as a worklist, |
b8698a0f | 1070 | with "n"-th bit representing the n-th block in the reverse-postorder order. |
240b5cea SB |
1071 | The solver is a double-queue algorithm similar to the "double stack" solver |
1072 | from Cooper, Harvey and Kennedy, "Iterative data-flow analysis, Revisited". | |
1073 | The only significant difference is that the worklist in this implementation | |
1074 | is always sorted in RPO of the CFG visiting direction. */ | |
4d779342 | 1075 | |
b8698a0f | 1076 | void |
6fb5fa3c DB |
1077 | df_worklist_dataflow (struct dataflow *dataflow, |
1078 | bitmap blocks_to_consider, | |
1079 | int *blocks_in_postorder, | |
1080 | int n_blocks) | |
4d779342 | 1081 | { |
6fb5fa3c | 1082 | bitmap pending = BITMAP_ALLOC (&df_bitmap_obstack); |
4d779342 | 1083 | bitmap_iterator bi; |
6fb5fa3c DB |
1084 | unsigned int *bbindex_to_postorder; |
1085 | int i; | |
1086 | unsigned int index; | |
1087 | enum df_flow_dir dir = dataflow->problem->dir; | |
4d779342 | 1088 | |
6fb5fa3c | 1089 | gcc_assert (dir != DF_NONE); |
4d779342 | 1090 | |
6fb5fa3c | 1091 | /* BBINDEX_TO_POSTORDER maps the bb->index to the reverse postorder. */ |
8b1c6fd7 DM |
1092 | bbindex_to_postorder = XNEWVEC (unsigned int, |
1093 | last_basic_block_for_fn (cfun)); | |
4d779342 | 1094 | |
6fb5fa3c | 1095 | /* Initialize the array to an out-of-bound value. */ |
8b1c6fd7 DM |
1096 | for (i = 0; i < last_basic_block_for_fn (cfun); i++) |
1097 | bbindex_to_postorder[i] = last_basic_block_for_fn (cfun); | |
23249ac4 | 1098 | |
6fb5fa3c | 1099 | /* Initialize the considered map. */ |
7ba9e72d | 1100 | auto_sbitmap considered (last_basic_block_for_fn (cfun)); |
f61e445a | 1101 | bitmap_clear (considered); |
6fb5fa3c | 1102 | EXECUTE_IF_SET_IN_BITMAP (blocks_to_consider, 0, index, bi) |
4d779342 | 1103 | { |
d7c028c0 | 1104 | bitmap_set_bit (considered, index); |
4d779342 DB |
1105 | } |
1106 | ||
6fb5fa3c | 1107 | /* Initialize the mapping of block index to postorder. */ |
4d779342 DB |
1108 | for (i = 0; i < n_blocks; i++) |
1109 | { | |
6fb5fa3c DB |
1110 | bbindex_to_postorder[blocks_in_postorder[i]] = i; |
1111 | /* Add all blocks to the worklist. */ | |
1112 | bitmap_set_bit (pending, i); | |
1113 | } | |
4d779342 | 1114 | |
185082a7 | 1115 | /* Initialize the problem. */ |
6fb5fa3c DB |
1116 | if (dataflow->problem->init_fun) |
1117 | dataflow->problem->init_fun (blocks_to_consider); | |
4d779342 | 1118 | |
240b5cea SB |
1119 | /* Solve it. */ |
1120 | df_worklist_dataflow_doublequeue (dataflow, pending, considered, | |
1121 | blocks_in_postorder, | |
1a0f3fa1 JH |
1122 | bbindex_to_postorder, |
1123 | n_blocks); | |
6fb5fa3c | 1124 | free (bbindex_to_postorder); |
4d779342 DB |
1125 | } |
1126 | ||
1127 | ||
1128 | /* Remove the entries not in BLOCKS from the LIST of length LEN, preserving | |
1129 | the order of the remaining entries. Returns the length of the resulting | |
1130 | list. */ | |
1131 | ||
1132 | static unsigned | |
1133 | df_prune_to_subcfg (int list[], unsigned len, bitmap blocks) | |
1134 | { | |
1135 | unsigned act, last; | |
1136 | ||
1137 | for (act = 0, last = 0; act < len; act++) | |
1138 | if (bitmap_bit_p (blocks, list[act])) | |
1139 | list[last++] = list[act]; | |
1140 | ||
1141 | return last; | |
1142 | } | |
1143 | ||
1144 | ||
b8698a0f | 1145 | /* Execute dataflow analysis on a single dataflow problem. |
4d779342 | 1146 | |
4d779342 DB |
1147 | BLOCKS_TO_CONSIDER are the blocks whose solution can either be |
1148 | examined or will be computed. For calls from DF_ANALYZE, this is | |
b8698a0f | 1149 | the set of blocks that has been passed to DF_SET_BLOCKS. |
4d779342 DB |
1150 | */ |
1151 | ||
23249ac4 | 1152 | void |
b8698a0f L |
1153 | df_analyze_problem (struct dataflow *dflow, |
1154 | bitmap blocks_to_consider, | |
6fb5fa3c | 1155 | int *postorder, int n_blocks) |
4d779342 | 1156 | { |
6fb5fa3c DB |
1157 | timevar_push (dflow->problem->tv_id); |
1158 | ||
e7f96023 JH |
1159 | /* (Re)Allocate the datastructures necessary to solve the problem. */ |
1160 | if (dflow->problem->alloc_fun) | |
1161 | dflow->problem->alloc_fun (blocks_to_consider); | |
1162 | ||
3089f8b5 | 1163 | #ifdef ENABLE_DF_CHECKING |
6fb5fa3c DB |
1164 | if (dflow->problem->verify_start_fun) |
1165 | dflow->problem->verify_start_fun (); | |
1166 | #endif | |
1167 | ||
6fb5fa3c | 1168 | /* Set up the problem and compute the local information. */ |
e45dcf9c | 1169 | if (dflow->problem->local_compute_fun) |
6fb5fa3c | 1170 | dflow->problem->local_compute_fun (blocks_to_consider); |
4d779342 DB |
1171 | |
1172 | /* Solve the equations. */ | |
e45dcf9c | 1173 | if (dflow->problem->dataflow_fun) |
6fb5fa3c DB |
1174 | dflow->problem->dataflow_fun (dflow, blocks_to_consider, |
1175 | postorder, n_blocks); | |
4d779342 DB |
1176 | |
1177 | /* Massage the solution. */ | |
e45dcf9c | 1178 | if (dflow->problem->finalize_fun) |
6fb5fa3c DB |
1179 | dflow->problem->finalize_fun (blocks_to_consider); |
1180 | ||
3089f8b5 | 1181 | #ifdef ENABLE_DF_CHECKING |
6fb5fa3c DB |
1182 | if (dflow->problem->verify_end_fun) |
1183 | dflow->problem->verify_end_fun (); | |
1184 | #endif | |
1185 | ||
1186 | timevar_pop (dflow->problem->tv_id); | |
1187 | ||
1188 | dflow->computed = true; | |
4d779342 DB |
1189 | } |
1190 | ||
1191 | ||
7be64667 | 1192 | /* Analyze dataflow info. */ |
4d779342 | 1193 | |
7be64667 RB |
1194 | static void |
1195 | df_analyze_1 (void) | |
4d779342 | 1196 | { |
6fb5fa3c | 1197 | int i; |
b8698a0f | 1198 | |
6fb5fa3c | 1199 | /* These should be the same. */ |
6fa95e09 | 1200 | gcc_assert ((unsigned) df->n_blocks == df->postorder_inverted.length ()); |
6fb5fa3c DB |
1201 | |
1202 | /* We need to do this before the df_verify_all because this is | |
1203 | not kept incrementally up to date. */ | |
1204 | df_compute_regs_ever_live (false); | |
1205 | df_process_deferred_rescans (); | |
1206 | ||
6fb5fa3c DB |
1207 | if (dump_file) |
1208 | fprintf (dump_file, "df_analyze called\n"); | |
3089f8b5 | 1209 | |
0d475361 PB |
1210 | #ifndef ENABLE_DF_CHECKING |
1211 | if (df->changeable_flags & DF_VERIFY_SCHEDULED) | |
1212 | #endif | |
1213 | df_verify (); | |
6fb5fa3c | 1214 | |
7be64667 RB |
1215 | /* Skip over the DF_SCAN problem. */ |
1216 | for (i = 1; i < df->num_problems_defined; i++) | |
1217 | { | |
1218 | struct dataflow *dflow = df->problems_in_order[i]; | |
1219 | if (dflow->solutions_dirty) | |
1220 | { | |
1221 | if (dflow->problem->dir == DF_FORWARD) | |
1222 | df_analyze_problem (dflow, | |
1223 | df->blocks_to_analyze, | |
6fa95e09 TS |
1224 | df->postorder_inverted.address (), |
1225 | df->postorder_inverted.length ()); | |
7be64667 RB |
1226 | else |
1227 | df_analyze_problem (dflow, | |
1228 | df->blocks_to_analyze, | |
1229 | df->postorder, | |
1230 | df->n_blocks); | |
1231 | } | |
1232 | } | |
1233 | ||
1234 | if (!df->analyze_subset) | |
1235 | { | |
1236 | BITMAP_FREE (df->blocks_to_analyze); | |
1237 | df->blocks_to_analyze = NULL; | |
1238 | } | |
1239 | ||
1240 | #ifdef DF_DEBUG_CFG | |
1241 | df_set_clean_cfg (); | |
1242 | #endif | |
1243 | } | |
1244 | ||
1245 | /* Analyze dataflow info. */ | |
1246 | ||
1247 | void | |
1248 | df_analyze (void) | |
1249 | { | |
1250 | bitmap current_all_blocks = BITMAP_ALLOC (&df_bitmap_obstack); | |
7be64667 RB |
1251 | |
1252 | free (df->postorder); | |
7be64667 | 1253 | df->postorder = XNEWVEC (int, last_basic_block_for_fn (cfun)); |
7be64667 | 1254 | df->n_blocks = post_order_compute (df->postorder, true, true); |
6fa95e09 TS |
1255 | df->postorder_inverted.truncate (0); |
1256 | inverted_post_order_compute (&df->postorder_inverted); | |
7be64667 | 1257 | |
6fa95e09 | 1258 | for (int i = 0; i < df->n_blocks; i++) |
6fb5fa3c DB |
1259 | bitmap_set_bit (current_all_blocks, df->postorder[i]); |
1260 | ||
b2b29377 MM |
1261 | if (flag_checking) |
1262 | { | |
1263 | /* Verify that POSTORDER_INVERTED only contains blocks reachable from | |
1264 | the ENTRY block. */ | |
6fa95e09 | 1265 | for (unsigned int i = 0; i < df->postorder_inverted.length (); i++) |
b2b29377 MM |
1266 | gcc_assert (bitmap_bit_p (current_all_blocks, |
1267 | df->postorder_inverted[i])); | |
1268 | } | |
4d779342 DB |
1269 | |
1270 | /* Make sure that we have pruned any unreachable blocks from these | |
1271 | sets. */ | |
6fb5fa3c | 1272 | if (df->analyze_subset) |
4d779342 | 1273 | { |
4d779342 | 1274 | bitmap_and_into (df->blocks_to_analyze, current_all_blocks); |
b8698a0f | 1275 | df->n_blocks = df_prune_to_subcfg (df->postorder, |
6fb5fa3c | 1276 | df->n_blocks, df->blocks_to_analyze); |
6fa95e09 TS |
1277 | unsigned int newlen = df_prune_to_subcfg (df->postorder_inverted.address (), |
1278 | df->postorder_inverted.length (), | |
7be64667 | 1279 | df->blocks_to_analyze); |
6fa95e09 | 1280 | df->postorder_inverted.truncate (newlen); |
4d779342 DB |
1281 | BITMAP_FREE (current_all_blocks); |
1282 | } | |
1283 | else | |
1284 | { | |
4d779342 DB |
1285 | df->blocks_to_analyze = current_all_blocks; |
1286 | current_all_blocks = NULL; | |
1287 | } | |
1288 | ||
7be64667 RB |
1289 | df_analyze_1 (); |
1290 | } | |
1291 | ||
1292 | /* Compute the reverse top sort order of the sub-CFG specified by LOOP. | |
1293 | Returns the number of blocks which is always loop->num_nodes. */ | |
1294 | ||
1295 | static int | |
1296 | loop_post_order_compute (int *post_order, struct loop *loop) | |
1297 | { | |
1298 | edge_iterator *stack; | |
1299 | int sp; | |
1300 | int post_order_num = 0; | |
7be64667 RB |
1301 | |
1302 | /* Allocate stack for back-tracking up CFG. */ | |
1303 | stack = XNEWVEC (edge_iterator, loop->num_nodes + 1); | |
1304 | sp = 0; | |
1305 | ||
1306 | /* Allocate bitmap to track nodes that have been visited. */ | |
0e3de1d4 | 1307 | auto_bitmap visited; |
7be64667 RB |
1308 | |
1309 | /* Push the first edge on to the stack. */ | |
1310 | stack[sp++] = ei_start (loop_preheader_edge (loop)->src->succs); | |
1311 | ||
1312 | while (sp) | |
6fb5fa3c | 1313 | { |
7be64667 RB |
1314 | edge_iterator ei; |
1315 | basic_block src; | |
1316 | basic_block dest; | |
1317 | ||
1318 | /* Look at the edge on the top of the stack. */ | |
1319 | ei = stack[sp - 1]; | |
1320 | src = ei_edge (ei)->src; | |
1321 | dest = ei_edge (ei)->dest; | |
1322 | ||
1323 | /* Check if the edge destination has been visited yet and mark it | |
1324 | if not so. */ | |
1325 | if (flow_bb_inside_loop_p (loop, dest) | |
1326 | && bitmap_set_bit (visited, dest->index)) | |
1327 | { | |
1328 | if (EDGE_COUNT (dest->succs) > 0) | |
1329 | /* Since the DEST node has been visited for the first | |
1330 | time, check its successors. */ | |
1331 | stack[sp++] = ei_start (dest->succs); | |
1332 | else | |
1333 | post_order[post_order_num++] = dest->index; | |
1334 | } | |
1335 | else | |
1336 | { | |
1337 | if (ei_one_before_end_p (ei) | |
1338 | && src != loop_preheader_edge (loop)->src) | |
1339 | post_order[post_order_num++] = src->index; | |
1340 | ||
1341 | if (!ei_one_before_end_p (ei)) | |
1342 | ei_next (&stack[sp - 1]); | |
1343 | else | |
1344 | sp--; | |
1345 | } | |
6fb5fa3c | 1346 | } |
4d779342 | 1347 | |
7be64667 | 1348 | free (stack); |
7be64667 RB |
1349 | |
1350 | return post_order_num; | |
1351 | } | |
1352 | ||
1353 | /* Compute the reverse top sort order of the inverted sub-CFG specified | |
1354 | by LOOP. Returns the number of blocks which is always loop->num_nodes. */ | |
1355 | ||
6fa95e09 TS |
1356 | static void |
1357 | loop_inverted_post_order_compute (vec<int> *post_order, struct loop *loop) | |
7be64667 RB |
1358 | { |
1359 | basic_block bb; | |
1360 | edge_iterator *stack; | |
1361 | int sp; | |
6fa95e09 TS |
1362 | |
1363 | post_order->reserve_exact (loop->num_nodes); | |
7be64667 RB |
1364 | |
1365 | /* Allocate stack for back-tracking up CFG. */ | |
1366 | stack = XNEWVEC (edge_iterator, loop->num_nodes + 1); | |
1367 | sp = 0; | |
1368 | ||
1369 | /* Allocate bitmap to track nodes that have been visited. */ | |
0e3de1d4 | 1370 | auto_bitmap visited; |
7be64667 RB |
1371 | |
1372 | /* Put all latches into the initial work list. In theory we'd want | |
1373 | to start from loop exits but then we'd have the special case of | |
1374 | endless loops. It doesn't really matter for DF iteration order and | |
1375 | handling latches last is probably even better. */ | |
1376 | stack[sp++] = ei_start (loop->header->preds); | |
1377 | bitmap_set_bit (visited, loop->header->index); | |
1378 | ||
1379 | /* The inverted traversal loop. */ | |
1380 | while (sp) | |
4d779342 | 1381 | { |
7be64667 RB |
1382 | edge_iterator ei; |
1383 | basic_block pred; | |
1384 | ||
1385 | /* Look at the edge on the top of the stack. */ | |
1386 | ei = stack[sp - 1]; | |
1387 | bb = ei_edge (ei)->dest; | |
1388 | pred = ei_edge (ei)->src; | |
1389 | ||
1390 | /* Check if the predecessor has been visited yet and mark it | |
1391 | if not so. */ | |
1392 | if (flow_bb_inside_loop_p (loop, pred) | |
1393 | && bitmap_set_bit (visited, pred->index)) | |
1394 | { | |
1395 | if (EDGE_COUNT (pred->preds) > 0) | |
1396 | /* Since the predecessor node has been visited for the first | |
1397 | time, check its predecessors. */ | |
1398 | stack[sp++] = ei_start (pred->preds); | |
1399 | else | |
6fa95e09 | 1400 | post_order->quick_push (pred->index); |
7be64667 RB |
1401 | } |
1402 | else | |
1403 | { | |
1404 | if (flow_bb_inside_loop_p (loop, bb) | |
1405 | && ei_one_before_end_p (ei)) | |
6fa95e09 | 1406 | post_order->quick_push (bb->index); |
7be64667 RB |
1407 | |
1408 | if (!ei_one_before_end_p (ei)) | |
1409 | ei_next (&stack[sp - 1]); | |
1410 | else | |
1411 | sp--; | |
1412 | } | |
4d779342 DB |
1413 | } |
1414 | ||
7be64667 | 1415 | free (stack); |
7be64667 RB |
1416 | } |
1417 | ||
1418 | ||
1419 | /* Analyze dataflow info for the basic blocks contained in LOOP. */ | |
1420 | ||
1421 | void | |
1422 | df_analyze_loop (struct loop *loop) | |
1423 | { | |
1424 | free (df->postorder); | |
7be64667 RB |
1425 | |
1426 | df->postorder = XNEWVEC (int, loop->num_nodes); | |
6fa95e09 | 1427 | df->postorder_inverted.truncate (0); |
7be64667 | 1428 | df->n_blocks = loop_post_order_compute (df->postorder, loop); |
6fa95e09 | 1429 | loop_inverted_post_order_compute (&df->postorder_inverted, loop); |
7be64667 | 1430 | gcc_assert ((unsigned) df->n_blocks == loop->num_nodes); |
6fa95e09 | 1431 | gcc_assert (df->postorder_inverted.length () == loop->num_nodes); |
7be64667 RB |
1432 | |
1433 | bitmap blocks = BITMAP_ALLOC (&df_bitmap_obstack); | |
1434 | for (int i = 0; i < df->n_blocks; ++i) | |
1435 | bitmap_set_bit (blocks, df->postorder[i]); | |
1436 | df_set_blocks (blocks); | |
1437 | BITMAP_FREE (blocks); | |
1438 | ||
1439 | df_analyze_1 (); | |
6fb5fa3c DB |
1440 | } |
1441 | ||
1442 | ||
1443 | /* Return the number of basic blocks from the last call to df_analyze. */ | |
1444 | ||
b8698a0f | 1445 | int |
6fb5fa3c DB |
1446 | df_get_n_blocks (enum df_flow_dir dir) |
1447 | { | |
1448 | gcc_assert (dir != DF_NONE); | |
1449 | ||
1450 | if (dir == DF_FORWARD) | |
1451 | { | |
6fa95e09 TS |
1452 | gcc_assert (df->postorder_inverted.length ()); |
1453 | return df->postorder_inverted.length (); | |
6fb5fa3c DB |
1454 | } |
1455 | ||
1456 | gcc_assert (df->postorder); | |
1457 | return df->n_blocks; | |
1458 | } | |
1459 | ||
1460 | ||
b8698a0f | 1461 | /* Return a pointer to the array of basic blocks in the reverse postorder. |
6fb5fa3c DB |
1462 | Depending on the direction of the dataflow problem, |
1463 | it returns either the usual reverse postorder array | |
1464 | or the reverse postorder of inverted traversal. */ | |
1465 | int * | |
1466 | df_get_postorder (enum df_flow_dir dir) | |
1467 | { | |
1468 | gcc_assert (dir != DF_NONE); | |
1469 | ||
1470 | if (dir == DF_FORWARD) | |
1471 | { | |
6fa95e09 TS |
1472 | gcc_assert (df->postorder_inverted.length ()); |
1473 | return df->postorder_inverted.address (); | |
6fb5fa3c DB |
1474 | } |
1475 | gcc_assert (df->postorder); | |
1476 | return df->postorder; | |
4d779342 DB |
1477 | } |
1478 | ||
b8698a0f | 1479 | static struct df_problem user_problem; |
6fb5fa3c | 1480 | static struct dataflow user_dflow; |
4d779342 | 1481 | |
6fb5fa3c DB |
1482 | /* Interface for calling iterative dataflow with user defined |
1483 | confluence and transfer functions. All that is necessary is to | |
1484 | supply DIR, a direction, CONF_FUN_0, a confluence function for | |
1485 | blocks with no logical preds (or NULL), CONF_FUN_N, the normal | |
1486 | confluence function, TRANS_FUN, the basic block transfer function, | |
1487 | and BLOCKS, the set of blocks to examine, POSTORDER the blocks in | |
1488 | postorder, and N_BLOCKS, the number of blocks in POSTORDER. */ | |
1489 | ||
1490 | void | |
1491 | df_simple_dataflow (enum df_flow_dir dir, | |
1492 | df_init_function init_fun, | |
1493 | df_confluence_function_0 con_fun_0, | |
1494 | df_confluence_function_n con_fun_n, | |
1495 | df_transfer_function trans_fun, | |
1496 | bitmap blocks, int * postorder, int n_blocks) | |
1497 | { | |
1498 | memset (&user_problem, 0, sizeof (struct df_problem)); | |
1499 | user_problem.dir = dir; | |
1500 | user_problem.init_fun = init_fun; | |
1501 | user_problem.con_fun_0 = con_fun_0; | |
1502 | user_problem.con_fun_n = con_fun_n; | |
1503 | user_problem.trans_fun = trans_fun; | |
1504 | user_dflow.problem = &user_problem; | |
1505 | df_worklist_dataflow (&user_dflow, blocks, postorder, n_blocks); | |
1506 | } | |
1507 | ||
b8698a0f | 1508 | |
4d779342 DB |
1509 | \f |
1510 | /*---------------------------------------------------------------------------- | |
1511 | Functions to support limited incremental change. | |
1512 | ----------------------------------------------------------------------------*/ | |
1513 | ||
1514 | ||
1515 | /* Get basic block info. */ | |
1516 | ||
1517 | static void * | |
1518 | df_get_bb_info (struct dataflow *dflow, unsigned int index) | |
1519 | { | |
6fb5fa3c DB |
1520 | if (dflow->block_info == NULL) |
1521 | return NULL; | |
1522 | if (index >= dflow->block_info_size) | |
1523 | return NULL; | |
e285df08 JH |
1524 | return (void *)((char *)dflow->block_info |
1525 | + index * dflow->problem->block_info_elt_size); | |
4d779342 DB |
1526 | } |
1527 | ||
1528 | ||
1529 | /* Set basic block info. */ | |
1530 | ||
1531 | static void | |
b8698a0f | 1532 | df_set_bb_info (struct dataflow *dflow, unsigned int index, |
4d779342 DB |
1533 | void *bb_info) |
1534 | { | |
6fb5fa3c | 1535 | gcc_assert (dflow->block_info); |
e285df08 JH |
1536 | memcpy ((char *)dflow->block_info |
1537 | + index * dflow->problem->block_info_elt_size, | |
1538 | bb_info, dflow->problem->block_info_elt_size); | |
1539 | } | |
1540 | ||
1541 | ||
1542 | /* Clear basic block info. */ | |
1543 | ||
1544 | static void | |
1545 | df_clear_bb_info (struct dataflow *dflow, unsigned int index) | |
1546 | { | |
1547 | gcc_assert (dflow->block_info); | |
1548 | gcc_assert (dflow->block_info_size > index); | |
1549 | memset ((char *)dflow->block_info | |
1550 | + index * dflow->problem->block_info_elt_size, | |
1551 | 0, dflow->problem->block_info_elt_size); | |
4d779342 DB |
1552 | } |
1553 | ||
1554 | ||
6fb5fa3c DB |
1555 | /* Mark the solutions as being out of date. */ |
1556 | ||
b8698a0f | 1557 | void |
6fb5fa3c DB |
1558 | df_mark_solutions_dirty (void) |
1559 | { | |
1560 | if (df) | |
1561 | { | |
b8698a0f | 1562 | int p; |
6fb5fa3c DB |
1563 | for (p = 1; p < df->num_problems_defined; p++) |
1564 | df->problems_in_order[p]->solutions_dirty = true; | |
1565 | } | |
1566 | } | |
1567 | ||
1568 | ||
1569 | /* Return true if BB needs it's transfer functions recomputed. */ | |
1570 | ||
b8698a0f | 1571 | bool |
6fb5fa3c DB |
1572 | df_get_bb_dirty (basic_block bb) |
1573 | { | |
65e0a0f3 JJ |
1574 | return bitmap_bit_p ((df_live |
1575 | ? df_live : df_lr)->out_of_date_transfer_functions, | |
1576 | bb->index); | |
6fb5fa3c DB |
1577 | } |
1578 | ||
1579 | ||
1580 | /* Mark BB as needing it's transfer functions as being out of | |
1581 | date. */ | |
1582 | ||
b8698a0f | 1583 | void |
6fb5fa3c DB |
1584 | df_set_bb_dirty (basic_block bb) |
1585 | { | |
4ec5d4f5 | 1586 | bb->flags |= BB_MODIFIED; |
6fb5fa3c DB |
1587 | if (df) |
1588 | { | |
b8698a0f | 1589 | int p; |
6fb5fa3c DB |
1590 | for (p = 1; p < df->num_problems_defined; p++) |
1591 | { | |
1592 | struct dataflow *dflow = df->problems_in_order[p]; | |
1593 | if (dflow->out_of_date_transfer_functions) | |
1594 | bitmap_set_bit (dflow->out_of_date_transfer_functions, bb->index); | |
1595 | } | |
1596 | df_mark_solutions_dirty (); | |
1597 | } | |
1598 | } | |
1599 | ||
1600 | ||
e285df08 JH |
1601 | /* Grow the bb_info array. */ |
1602 | ||
1603 | void | |
1604 | df_grow_bb_info (struct dataflow *dflow) | |
1605 | { | |
8b1c6fd7 | 1606 | unsigned int new_size = last_basic_block_for_fn (cfun) + 1; |
e285df08 JH |
1607 | if (dflow->block_info_size < new_size) |
1608 | { | |
1609 | new_size += new_size / 4; | |
1610 | dflow->block_info | |
1611 | = (void *)XRESIZEVEC (char, (char *)dflow->block_info, | |
1612 | new_size | |
1613 | * dflow->problem->block_info_elt_size); | |
1614 | memset ((char *)dflow->block_info | |
1615 | + dflow->block_info_size | |
1616 | * dflow->problem->block_info_elt_size, | |
1617 | 0, | |
1618 | (new_size - dflow->block_info_size) | |
1619 | * dflow->problem->block_info_elt_size); | |
1620 | dflow->block_info_size = new_size; | |
1621 | } | |
1622 | } | |
1623 | ||
c23cd1d6 | 1624 | |
6fb5fa3c DB |
1625 | /* Clear the dirty bits. This is called from places that delete |
1626 | blocks. */ | |
1627 | static void | |
1628 | df_clear_bb_dirty (basic_block bb) | |
1629 | { | |
b8698a0f | 1630 | int p; |
6fb5fa3c DB |
1631 | for (p = 1; p < df->num_problems_defined; p++) |
1632 | { | |
1633 | struct dataflow *dflow = df->problems_in_order[p]; | |
1634 | if (dflow->out_of_date_transfer_functions) | |
1635 | bitmap_clear_bit (dflow->out_of_date_transfer_functions, bb->index); | |
1636 | } | |
1637 | } | |
e285df08 | 1638 | |
4d779342 DB |
1639 | /* Called from the rtl_compact_blocks to reorganize the problems basic |
1640 | block info. */ | |
1641 | ||
b8698a0f | 1642 | void |
6fb5fa3c | 1643 | df_compact_blocks (void) |
4d779342 DB |
1644 | { |
1645 | int i, p; | |
1646 | basic_block bb; | |
e285df08 | 1647 | void *problem_temps; |
4d779342 | 1648 | |
d648b5ff | 1649 | auto_bitmap tmp (&df_bitmap_obstack); |
4d779342 DB |
1650 | for (p = 0; p < df->num_problems_defined; p++) |
1651 | { | |
1652 | struct dataflow *dflow = df->problems_in_order[p]; | |
6fb5fa3c DB |
1653 | |
1654 | /* Need to reorganize the out_of_date_transfer_functions for the | |
1655 | dflow problem. */ | |
1656 | if (dflow->out_of_date_transfer_functions) | |
1657 | { | |
d648b5ff | 1658 | bitmap_copy (tmp, dflow->out_of_date_transfer_functions); |
6fb5fa3c | 1659 | bitmap_clear (dflow->out_of_date_transfer_functions); |
d648b5ff | 1660 | if (bitmap_bit_p (tmp, ENTRY_BLOCK)) |
6fb5fa3c | 1661 | bitmap_set_bit (dflow->out_of_date_transfer_functions, ENTRY_BLOCK); |
d648b5ff | 1662 | if (bitmap_bit_p (tmp, EXIT_BLOCK)) |
6fb5fa3c DB |
1663 | bitmap_set_bit (dflow->out_of_date_transfer_functions, EXIT_BLOCK); |
1664 | ||
1665 | i = NUM_FIXED_BLOCKS; | |
11cd3bed | 1666 | FOR_EACH_BB_FN (bb, cfun) |
6fb5fa3c | 1667 | { |
d648b5ff | 1668 | if (bitmap_bit_p (tmp, bb->index)) |
6fb5fa3c DB |
1669 | bitmap_set_bit (dflow->out_of_date_transfer_functions, i); |
1670 | i++; | |
1671 | } | |
1672 | } | |
1673 | ||
1674 | /* Now shuffle the block info for the problem. */ | |
e45dcf9c | 1675 | if (dflow->problem->free_bb_fun) |
4d779342 | 1676 | { |
8b1c6fd7 DM |
1677 | int size = (last_basic_block_for_fn (cfun) |
1678 | * dflow->problem->block_info_elt_size); | |
e285df08 | 1679 | problem_temps = XNEWVAR (char, size); |
4d779342 DB |
1680 | df_grow_bb_info (dflow); |
1681 | memcpy (problem_temps, dflow->block_info, size); | |
1682 | ||
1683 | /* Copy the bb info from the problem tmps to the proper | |
1684 | place in the block_info vector. Null out the copied | |
6fb5fa3c | 1685 | item. The entry and exit blocks never move. */ |
4d779342 | 1686 | i = NUM_FIXED_BLOCKS; |
11cd3bed | 1687 | FOR_EACH_BB_FN (bb, cfun) |
4d779342 | 1688 | { |
e285df08 JH |
1689 | df_set_bb_info (dflow, i, |
1690 | (char *)problem_temps | |
1691 | + bb->index * dflow->problem->block_info_elt_size); | |
4d779342 DB |
1692 | i++; |
1693 | } | |
e285df08 JH |
1694 | memset ((char *)dflow->block_info |
1695 | + i * dflow->problem->block_info_elt_size, 0, | |
8b1c6fd7 | 1696 | (last_basic_block_for_fn (cfun) - i) |
e285df08 | 1697 | * dflow->problem->block_info_elt_size); |
f75aa51c | 1698 | free (problem_temps); |
4d779342 DB |
1699 | } |
1700 | } | |
1701 | ||
6fb5fa3c DB |
1702 | /* Shuffle the bits in the basic_block indexed arrays. */ |
1703 | ||
1704 | if (df->blocks_to_analyze) | |
1705 | { | |
d648b5ff | 1706 | if (bitmap_bit_p (tmp, ENTRY_BLOCK)) |
6fb5fa3c | 1707 | bitmap_set_bit (df->blocks_to_analyze, ENTRY_BLOCK); |
d648b5ff | 1708 | if (bitmap_bit_p (tmp, EXIT_BLOCK)) |
6fb5fa3c | 1709 | bitmap_set_bit (df->blocks_to_analyze, EXIT_BLOCK); |
d648b5ff | 1710 | bitmap_copy (tmp, df->blocks_to_analyze); |
6fb5fa3c DB |
1711 | bitmap_clear (df->blocks_to_analyze); |
1712 | i = NUM_FIXED_BLOCKS; | |
11cd3bed | 1713 | FOR_EACH_BB_FN (bb, cfun) |
6fb5fa3c | 1714 | { |
d648b5ff | 1715 | if (bitmap_bit_p (tmp, bb->index)) |
6fb5fa3c DB |
1716 | bitmap_set_bit (df->blocks_to_analyze, i); |
1717 | i++; | |
1718 | } | |
1719 | } | |
1720 | ||
4d779342 | 1721 | i = NUM_FIXED_BLOCKS; |
11cd3bed | 1722 | FOR_EACH_BB_FN (bb, cfun) |
4d779342 | 1723 | { |
557c4b49 | 1724 | SET_BASIC_BLOCK_FOR_FN (cfun, i, bb); |
4d779342 DB |
1725 | bb->index = i; |
1726 | i++; | |
1727 | } | |
1728 | ||
0cae8d31 | 1729 | gcc_assert (i == n_basic_blocks_for_fn (cfun)); |
4d779342 | 1730 | |
8b1c6fd7 | 1731 | for (; i < last_basic_block_for_fn (cfun); i++) |
557c4b49 | 1732 | SET_BASIC_BLOCK_FOR_FN (cfun, i, NULL); |
6fb5fa3c DB |
1733 | |
1734 | #ifdef DF_DEBUG_CFG | |
1735 | if (!df_lr->solutions_dirty) | |
1736 | df_set_clean_cfg (); | |
1737 | #endif | |
4d779342 DB |
1738 | } |
1739 | ||
1740 | ||
6fb5fa3c | 1741 | /* Shove NEW_BLOCK in at OLD_INDEX. Called from ifcvt to hack a |
4d779342 DB |
1742 | block. There is no excuse for people to do this kind of thing. */ |
1743 | ||
b8698a0f | 1744 | void |
6fb5fa3c | 1745 | df_bb_replace (int old_index, basic_block new_block) |
4d779342 | 1746 | { |
6fb5fa3c | 1747 | int new_block_index = new_block->index; |
4d779342 DB |
1748 | int p; |
1749 | ||
6fb5fa3c DB |
1750 | if (dump_file) |
1751 | fprintf (dump_file, "shoving block %d into %d\n", new_block_index, old_index); | |
1752 | ||
1753 | gcc_assert (df); | |
06e28de2 | 1754 | gcc_assert (BASIC_BLOCK_FOR_FN (cfun, old_index) == NULL); |
6fb5fa3c | 1755 | |
4d779342 DB |
1756 | for (p = 0; p < df->num_problems_defined; p++) |
1757 | { | |
1758 | struct dataflow *dflow = df->problems_in_order[p]; | |
1759 | if (dflow->block_info) | |
1760 | { | |
4d779342 | 1761 | df_grow_bb_info (dflow); |
b8698a0f | 1762 | df_set_bb_info (dflow, old_index, |
6fb5fa3c | 1763 | df_get_bb_info (dflow, new_block_index)); |
4d779342 DB |
1764 | } |
1765 | } | |
1766 | ||
6fb5fa3c | 1767 | df_clear_bb_dirty (new_block); |
557c4b49 | 1768 | SET_BASIC_BLOCK_FOR_FN (cfun, old_index, new_block); |
4d779342 | 1769 | new_block->index = old_index; |
06e28de2 | 1770 | df_set_bb_dirty (BASIC_BLOCK_FOR_FN (cfun, old_index)); |
557c4b49 | 1771 | SET_BASIC_BLOCK_FOR_FN (cfun, new_block_index, NULL); |
6fb5fa3c DB |
1772 | } |
1773 | ||
1774 | ||
1775 | /* Free all of the per basic block dataflow from all of the problems. | |
1776 | This is typically called before a basic block is deleted and the | |
1777 | problem will be reanalyzed. */ | |
1778 | ||
1779 | void | |
1780 | df_bb_delete (int bb_index) | |
1781 | { | |
06e28de2 | 1782 | basic_block bb = BASIC_BLOCK_FOR_FN (cfun, bb_index); |
6fb5fa3c DB |
1783 | int i; |
1784 | ||
1785 | if (!df) | |
1786 | return; | |
b8698a0f | 1787 | |
6fb5fa3c DB |
1788 | for (i = 0; i < df->num_problems_defined; i++) |
1789 | { | |
1790 | struct dataflow *dflow = df->problems_in_order[i]; | |
1791 | if (dflow->problem->free_bb_fun) | |
1792 | { | |
1793 | void *bb_info = df_get_bb_info (dflow, bb_index); | |
1794 | if (bb_info) | |
1795 | { | |
b8698a0f | 1796 | dflow->problem->free_bb_fun (bb, bb_info); |
e285df08 | 1797 | df_clear_bb_info (dflow, bb_index); |
6fb5fa3c DB |
1798 | } |
1799 | } | |
1800 | } | |
1801 | df_clear_bb_dirty (bb); | |
1802 | df_mark_solutions_dirty (); | |
1803 | } | |
1804 | ||
1805 | ||
1806 | /* Verify that there is a place for everything and everything is in | |
1807 | its place. This is too expensive to run after every pass in the | |
1808 | mainline. However this is an excellent debugging tool if the | |
6ed3da00 | 1809 | dataflow information is not being updated properly. You can just |
6fb5fa3c DB |
1810 | sprinkle calls in until you find the place that is changing an |
1811 | underlying structure without calling the proper updating | |
0d52bcc1 | 1812 | routine. */ |
6fb5fa3c DB |
1813 | |
1814 | void | |
1815 | df_verify (void) | |
1816 | { | |
1817 | df_scan_verify (); | |
0d475361 | 1818 | #ifdef ENABLE_DF_CHECKING |
6fb5fa3c DB |
1819 | df_lr_verify_transfer_functions (); |
1820 | if (df_live) | |
1821 | df_live_verify_transfer_functions (); | |
0d475361 | 1822 | #endif |
2c90c549 | 1823 | df->changeable_flags &= ~DF_VERIFY_SCHEDULED; |
6fb5fa3c DB |
1824 | } |
1825 | ||
1826 | #ifdef DF_DEBUG_CFG | |
1827 | ||
1828 | /* Compute an array of ints that describes the cfg. This can be used | |
1829 | to discover places where the cfg is modified by the appropriate | |
1830 | calls have not been made to the keep df informed. The internals of | |
1831 | this are unexciting, the key is that two instances of this can be | |
1832 | compared to see if any changes have been made to the cfg. */ | |
1833 | ||
1834 | static int * | |
1835 | df_compute_cfg_image (void) | |
1836 | { | |
1837 | basic_block bb; | |
0cae8d31 | 1838 | int size = 2 + (2 * n_basic_blocks_for_fn (cfun)); |
6fb5fa3c DB |
1839 | int i; |
1840 | int * map; | |
1841 | ||
04a90bec | 1842 | FOR_ALL_BB_FN (bb, cfun) |
6fb5fa3c DB |
1843 | { |
1844 | size += EDGE_COUNT (bb->succs); | |
1845 | } | |
1846 | ||
1847 | map = XNEWVEC (int, size); | |
1848 | map[0] = size; | |
1849 | i = 1; | |
04a90bec | 1850 | FOR_ALL_BB_FN (bb, cfun) |
6fb5fa3c DB |
1851 | { |
1852 | edge_iterator ei; | |
1853 | edge e; | |
1854 | ||
1855 | map[i++] = bb->index; | |
1856 | FOR_EACH_EDGE (e, ei, bb->succs) | |
1857 | map[i++] = e->dest->index; | |
1858 | map[i++] = -1; | |
1859 | } | |
1860 | map[i] = -1; | |
1861 | return map; | |
1862 | } | |
1863 | ||
1864 | static int *saved_cfg = NULL; | |
1865 | ||
1866 | ||
1867 | /* This function compares the saved version of the cfg with the | |
1868 | current cfg and aborts if the two are identical. The function | |
1869 | silently returns if the cfg has been marked as dirty or the two are | |
1870 | the same. */ | |
1871 | ||
1872 | void | |
1873 | df_check_cfg_clean (void) | |
1874 | { | |
1875 | int *new_map; | |
1876 | ||
1877 | if (!df) | |
1878 | return; | |
1879 | ||
1880 | if (df_lr->solutions_dirty) | |
1881 | return; | |
1882 | ||
b8698a0f | 1883 | if (saved_cfg == NULL) |
6fb5fa3c DB |
1884 | return; |
1885 | ||
1886 | new_map = df_compute_cfg_image (); | |
1887 | gcc_assert (memcmp (saved_cfg, new_map, saved_cfg[0] * sizeof (int)) == 0); | |
1888 | free (new_map); | |
4d779342 DB |
1889 | } |
1890 | ||
6fb5fa3c DB |
1891 | |
1892 | /* This function builds a cfg fingerprint and squirrels it away in | |
1893 | saved_cfg. */ | |
1894 | ||
1895 | static void | |
1896 | df_set_clean_cfg (void) | |
1897 | { | |
04695783 | 1898 | free (saved_cfg); |
6fb5fa3c DB |
1899 | saved_cfg = df_compute_cfg_image (); |
1900 | } | |
1901 | ||
1902 | #endif /* DF_DEBUG_CFG */ | |
4d779342 DB |
1903 | /*---------------------------------------------------------------------------- |
1904 | PUBLIC INTERFACES TO QUERY INFORMATION. | |
1905 | ----------------------------------------------------------------------------*/ | |
1906 | ||
1907 | ||
4d779342 DB |
1908 | /* Return first def of REGNO within BB. */ |
1909 | ||
b8698a0f | 1910 | df_ref |
6fb5fa3c | 1911 | df_bb_regno_first_def_find (basic_block bb, unsigned int regno) |
4d779342 | 1912 | { |
dd3eed93 | 1913 | rtx_insn *insn; |
bfac633a | 1914 | df_ref def; |
4d779342 DB |
1915 | |
1916 | FOR_BB_INSNS (bb, insn) | |
1917 | { | |
a1b53177 SB |
1918 | if (!INSN_P (insn)) |
1919 | continue; | |
1920 | ||
bfac633a RS |
1921 | FOR_EACH_INSN_DEF (def, insn) |
1922 | if (DF_REF_REGNO (def) == regno) | |
1923 | return def; | |
4d779342 DB |
1924 | } |
1925 | return NULL; | |
1926 | } | |
1927 | ||
1928 | ||
1929 | /* Return last def of REGNO within BB. */ | |
1930 | ||
b8698a0f | 1931 | df_ref |
6fb5fa3c | 1932 | df_bb_regno_last_def_find (basic_block bb, unsigned int regno) |
4d779342 | 1933 | { |
dd3eed93 | 1934 | rtx_insn *insn; |
bfac633a | 1935 | df_ref def; |
4d779342 DB |
1936 | |
1937 | FOR_BB_INSNS_REVERSE (bb, insn) | |
1938 | { | |
a1b53177 SB |
1939 | if (!INSN_P (insn)) |
1940 | continue; | |
4d779342 | 1941 | |
bfac633a RS |
1942 | FOR_EACH_INSN_DEF (def, insn) |
1943 | if (DF_REF_REGNO (def) == regno) | |
1944 | return def; | |
4d779342 DB |
1945 | } |
1946 | ||
1947 | return NULL; | |
1948 | } | |
1949 | ||
4d779342 DB |
1950 | /* Finds the reference corresponding to the definition of REG in INSN. |
1951 | DF is the dataflow object. */ | |
1952 | ||
b8698a0f | 1953 | df_ref |
b2908ba6 | 1954 | df_find_def (rtx_insn *insn, rtx reg) |
4d779342 | 1955 | { |
bfac633a | 1956 | df_ref def; |
4d779342 DB |
1957 | |
1958 | if (GET_CODE (reg) == SUBREG) | |
1959 | reg = SUBREG_REG (reg); | |
1960 | gcc_assert (REG_P (reg)); | |
1961 | ||
bfac633a RS |
1962 | FOR_EACH_INSN_DEF (def, insn) |
1963 | if (DF_REF_REGNO (def) == REGNO (reg)) | |
1964 | return def; | |
4d779342 DB |
1965 | |
1966 | return NULL; | |
1967 | } | |
1968 | ||
1969 | ||
b8698a0f | 1970 | /* Return true if REG is defined in INSN, zero otherwise. */ |
4d779342 DB |
1971 | |
1972 | bool | |
b2908ba6 | 1973 | df_reg_defined (rtx_insn *insn, rtx reg) |
4d779342 | 1974 | { |
6fb5fa3c | 1975 | return df_find_def (insn, reg) != NULL; |
4d779342 | 1976 | } |
b8698a0f | 1977 | |
4d779342 DB |
1978 | |
1979 | /* Finds the reference corresponding to the use of REG in INSN. | |
1980 | DF is the dataflow object. */ | |
b8698a0f L |
1981 | |
1982 | df_ref | |
b2908ba6 | 1983 | df_find_use (rtx_insn *insn, rtx reg) |
4d779342 | 1984 | { |
bfac633a | 1985 | df_ref use; |
4d779342 DB |
1986 | |
1987 | if (GET_CODE (reg) == SUBREG) | |
1988 | reg = SUBREG_REG (reg); | |
1989 | gcc_assert (REG_P (reg)); | |
1990 | ||
bfac633a RS |
1991 | df_insn_info *insn_info = DF_INSN_INFO_GET (insn); |
1992 | FOR_EACH_INSN_INFO_USE (use, insn_info) | |
1993 | if (DF_REF_REGNO (use) == REGNO (reg)) | |
1994 | return use; | |
1995 | if (df->changeable_flags & DF_EQ_NOTES) | |
1996 | FOR_EACH_INSN_INFO_EQ_USE (use, insn_info) | |
226e378f | 1997 | if (DF_REF_REGNO (use) == REGNO (reg)) |
6fb5fa3c | 1998 | return use; |
4d779342 DB |
1999 | return NULL; |
2000 | } | |
2001 | ||
2002 | ||
b8698a0f | 2003 | /* Return true if REG is referenced in INSN, zero otherwise. */ |
4d779342 DB |
2004 | |
2005 | bool | |
b2908ba6 | 2006 | df_reg_used (rtx_insn *insn, rtx reg) |
4d779342 | 2007 | { |
6fb5fa3c | 2008 | return df_find_use (insn, reg) != NULL; |
4d779342 | 2009 | } |
b8698a0f | 2010 | |
4d779342 DB |
2011 | \f |
2012 | /*---------------------------------------------------------------------------- | |
2013 | Debugging and printing functions. | |
2014 | ----------------------------------------------------------------------------*/ | |
2015 | ||
532aafad SB |
2016 | /* Write information about registers and basic blocks into FILE. |
2017 | This is part of making a debugging dump. */ | |
2018 | ||
2019 | void | |
2020 | dump_regset (regset r, FILE *outf) | |
2021 | { | |
2022 | unsigned i; | |
2023 | reg_set_iterator rsi; | |
2024 | ||
2025 | if (r == NULL) | |
2026 | { | |
2027 | fputs (" (nil)", outf); | |
2028 | return; | |
2029 | } | |
2030 | ||
2031 | EXECUTE_IF_SET_IN_REG_SET (r, 0, i, rsi) | |
2032 | { | |
2033 | fprintf (outf, " %d", i); | |
2034 | if (i < FIRST_PSEUDO_REGISTER) | |
2035 | fprintf (outf, " [%s]", | |
2036 | reg_names[i]); | |
2037 | } | |
2038 | } | |
2039 | ||
2040 | /* Print a human-readable representation of R on the standard error | |
2041 | stream. This function is designed to be used from within the | |
2042 | debugger. */ | |
2043 | extern void debug_regset (regset); | |
2044 | DEBUG_FUNCTION void | |
2045 | debug_regset (regset r) | |
2046 | { | |
2047 | dump_regset (r, stderr); | |
2048 | putc ('\n', stderr); | |
2049 | } | |
6fb5fa3c DB |
2050 | |
2051 | /* Write information about registers and basic blocks into FILE. | |
2052 | This is part of making a debugging dump. */ | |
2053 | ||
2054 | void | |
2055 | df_print_regset (FILE *file, bitmap r) | |
2056 | { | |
2057 | unsigned int i; | |
2058 | bitmap_iterator bi; | |
2059 | ||
2060 | if (r == NULL) | |
2061 | fputs (" (nil)", file); | |
2062 | else | |
2063 | { | |
2064 | EXECUTE_IF_SET_IN_BITMAP (r, 0, i, bi) | |
2065 | { | |
2066 | fprintf (file, " %d", i); | |
2067 | if (i < FIRST_PSEUDO_REGISTER) | |
2068 | fprintf (file, " [%s]", reg_names[i]); | |
2069 | } | |
2070 | } | |
2071 | fprintf (file, "\n"); | |
2072 | } | |
2073 | ||
2074 | ||
cc806ac1 RS |
2075 | /* Write information about registers and basic blocks into FILE. The |
2076 | bitmap is in the form used by df_byte_lr. This is part of making a | |
2077 | debugging dump. */ | |
2078 | ||
2079 | void | |
8d074192 | 2080 | df_print_word_regset (FILE *file, bitmap r) |
cc806ac1 RS |
2081 | { |
2082 | unsigned int max_reg = max_reg_num (); | |
cc806ac1 RS |
2083 | |
2084 | if (r == NULL) | |
2085 | fputs (" (nil)", file); | |
2086 | else | |
2087 | { | |
2088 | unsigned int i; | |
8d074192 | 2089 | for (i = FIRST_PSEUDO_REGISTER; i < max_reg; i++) |
cc806ac1 | 2090 | { |
8d074192 BS |
2091 | bool found = (bitmap_bit_p (r, 2 * i) |
2092 | || bitmap_bit_p (r, 2 * i + 1)); | |
2093 | if (found) | |
cc806ac1 | 2094 | { |
8d074192 BS |
2095 | int word; |
2096 | const char * sep = ""; | |
2097 | fprintf (file, " %d", i); | |
2098 | fprintf (file, "("); | |
2099 | for (word = 0; word < 2; word++) | |
2100 | if (bitmap_bit_p (r, 2 * i + word)) | |
2101 | { | |
2102 | fprintf (file, "%s%d", sep, word); | |
2103 | sep = ", "; | |
2104 | } | |
2105 | fprintf (file, ")"); | |
cc806ac1 | 2106 | } |
cc806ac1 RS |
2107 | } |
2108 | } | |
2109 | fprintf (file, "\n"); | |
2110 | } | |
2111 | ||
2112 | ||
4d779342 | 2113 | /* Dump dataflow info. */ |
ffd640ed | 2114 | |
4d779342 | 2115 | void |
6fb5fa3c DB |
2116 | df_dump (FILE *file) |
2117 | { | |
2118 | basic_block bb; | |
2119 | df_dump_start (file); | |
2120 | ||
04a90bec | 2121 | FOR_ALL_BB_FN (bb, cfun) |
6fb5fa3c DB |
2122 | { |
2123 | df_print_bb_index (bb, file); | |
2124 | df_dump_top (bb, file); | |
2125 | df_dump_bottom (bb, file); | |
2126 | } | |
2127 | ||
2128 | fprintf (file, "\n"); | |
2129 | } | |
2130 | ||
2131 | ||
ffd640ed KZ |
2132 | /* Dump dataflow info for df->blocks_to_analyze. */ |
2133 | ||
2134 | void | |
2135 | df_dump_region (FILE *file) | |
2136 | { | |
2137 | if (df->blocks_to_analyze) | |
2138 | { | |
2139 | bitmap_iterator bi; | |
2140 | unsigned int bb_index; | |
2141 | ||
2142 | fprintf (file, "\n\nstarting region dump\n"); | |
2143 | df_dump_start (file); | |
b8698a0f L |
2144 | |
2145 | EXECUTE_IF_SET_IN_BITMAP (df->blocks_to_analyze, 0, bb_index, bi) | |
ffd640ed | 2146 | { |
06e28de2 | 2147 | basic_block bb = BASIC_BLOCK_FOR_FN (cfun, bb_index); |
7b19209f | 2148 | dump_bb (file, bb, 0, TDF_DETAILS); |
ffd640ed KZ |
2149 | } |
2150 | fprintf (file, "\n"); | |
2151 | } | |
b8698a0f | 2152 | else |
ffd640ed KZ |
2153 | df_dump (file); |
2154 | } | |
2155 | ||
2156 | ||
6fb5fa3c DB |
2157 | /* Dump the introductory information for each problem defined. */ |
2158 | ||
2159 | void | |
2160 | df_dump_start (FILE *file) | |
4d779342 DB |
2161 | { |
2162 | int i; | |
2163 | ||
23249ac4 | 2164 | if (!df || !file) |
4d779342 DB |
2165 | return; |
2166 | ||
2167 | fprintf (file, "\n\n%s\n", current_function_name ()); | |
2168 | fprintf (file, "\nDataflow summary:\n"); | |
6fb5fa3c DB |
2169 | if (df->blocks_to_analyze) |
2170 | fprintf (file, "def_info->table_size = %d, use_info->table_size = %d\n", | |
2171 | DF_DEFS_TABLE_SIZE (), DF_USES_TABLE_SIZE ()); | |
4d779342 DB |
2172 | |
2173 | for (i = 0; i < df->num_problems_defined; i++) | |
6fb5fa3c DB |
2174 | { |
2175 | struct dataflow *dflow = df->problems_in_order[i]; | |
2176 | if (dflow->computed) | |
2177 | { | |
2178 | df_dump_problem_function fun = dflow->problem->dump_start_fun; | |
2179 | if (fun) | |
c3284718 | 2180 | fun (file); |
6fb5fa3c DB |
2181 | } |
2182 | } | |
2183 | } | |
4d779342 | 2184 | |
6fb5fa3c | 2185 | |
7b19209f SB |
2186 | /* Dump the top or bottom of the block information for BB. */ |
2187 | static void | |
2188 | df_dump_bb_problem_data (basic_block bb, FILE *file, bool top) | |
6fb5fa3c DB |
2189 | { |
2190 | int i; | |
2191 | ||
2192 | if (!df || !file) | |
2193 | return; | |
2194 | ||
2195 | for (i = 0; i < df->num_problems_defined; i++) | |
2196 | { | |
2197 | struct dataflow *dflow = df->problems_in_order[i]; | |
2198 | if (dflow->computed) | |
2199 | { | |
7b19209f SB |
2200 | df_dump_bb_problem_function bbfun; |
2201 | ||
2202 | if (top) | |
2203 | bbfun = dflow->problem->dump_top_fun; | |
2204 | else | |
2205 | bbfun = dflow->problem->dump_bottom_fun; | |
2206 | ||
6fb5fa3c | 2207 | if (bbfun) |
b8698a0f | 2208 | bbfun (bb, file); |
6fb5fa3c DB |
2209 | } |
2210 | } | |
2211 | } | |
2212 | ||
7b19209f SB |
2213 | /* Dump the top of the block information for BB. */ |
2214 | ||
2215 | void | |
2216 | df_dump_top (basic_block bb, FILE *file) | |
2217 | { | |
2218 | df_dump_bb_problem_data (bb, file, /*top=*/true); | |
2219 | } | |
6fb5fa3c | 2220 | |
b8698a0f | 2221 | /* Dump the bottom of the block information for BB. */ |
6fb5fa3c DB |
2222 | |
2223 | void | |
2224 | df_dump_bottom (basic_block bb, FILE *file) | |
7b19209f SB |
2225 | { |
2226 | df_dump_bb_problem_data (bb, file, /*top=*/false); | |
2227 | } | |
2228 | ||
2229 | ||
2230 | /* Dump information about INSN just before or after dumping INSN itself. */ | |
2231 | static void | |
b2908ba6 | 2232 | df_dump_insn_problem_data (const rtx_insn *insn, FILE *file, bool top) |
6fb5fa3c DB |
2233 | { |
2234 | int i; | |
2235 | ||
2236 | if (!df || !file) | |
2237 | return; | |
2238 | ||
2239 | for (i = 0; i < df->num_problems_defined; i++) | |
2240 | { | |
2241 | struct dataflow *dflow = df->problems_in_order[i]; | |
2242 | if (dflow->computed) | |
2243 | { | |
7b19209f SB |
2244 | df_dump_insn_problem_function insnfun; |
2245 | ||
2246 | if (top) | |
2247 | insnfun = dflow->problem->dump_insn_top_fun; | |
2248 | else | |
2249 | insnfun = dflow->problem->dump_insn_bottom_fun; | |
2250 | ||
2251 | if (insnfun) | |
2252 | insnfun (insn, file); | |
6fb5fa3c DB |
2253 | } |
2254 | } | |
4d779342 DB |
2255 | } |
2256 | ||
7b19209f SB |
2257 | /* Dump information about INSN before dumping INSN itself. */ |
2258 | ||
2259 | void | |
b2908ba6 | 2260 | df_dump_insn_top (const rtx_insn *insn, FILE *file) |
7b19209f SB |
2261 | { |
2262 | df_dump_insn_problem_data (insn, file, /*top=*/true); | |
2263 | } | |
2264 | ||
2265 | /* Dump information about INSN after dumping INSN itself. */ | |
2266 | ||
2267 | void | |
b2908ba6 | 2268 | df_dump_insn_bottom (const rtx_insn *insn, FILE *file) |
7b19209f SB |
2269 | { |
2270 | df_dump_insn_problem_data (insn, file, /*top=*/false); | |
2271 | } | |
2272 | ||
4d779342 | 2273 | |
885c9b5d EB |
2274 | static void |
2275 | df_ref_dump (df_ref ref, FILE *file) | |
2276 | { | |
2277 | fprintf (file, "%c%d(%d)", | |
2278 | DF_REF_REG_DEF_P (ref) | |
2279 | ? 'd' | |
2280 | : (DF_REF_FLAGS (ref) & DF_REF_IN_NOTE) ? 'e' : 'u', | |
2281 | DF_REF_ID (ref), | |
2282 | DF_REF_REGNO (ref)); | |
2283 | } | |
2284 | ||
4d779342 | 2285 | void |
b512946c | 2286 | df_refs_chain_dump (df_ref ref, bool follow_chain, FILE *file) |
4d779342 DB |
2287 | { |
2288 | fprintf (file, "{ "); | |
b512946c | 2289 | for (; ref; ref = DF_REF_NEXT_LOC (ref)) |
4d779342 | 2290 | { |
885c9b5d | 2291 | df_ref_dump (ref, file); |
4d779342 | 2292 | if (follow_chain) |
23249ac4 | 2293 | df_chain_dump (DF_REF_CHAIN (ref), file); |
4d779342 DB |
2294 | } |
2295 | fprintf (file, "}"); | |
2296 | } | |
2297 | ||
2298 | ||
2299 | /* Dump either a ref-def or reg-use chain. */ | |
2300 | ||
2301 | void | |
57512f53 | 2302 | df_regs_chain_dump (df_ref ref, FILE *file) |
4d779342 DB |
2303 | { |
2304 | fprintf (file, "{ "); | |
2305 | while (ref) | |
2306 | { | |
885c9b5d | 2307 | df_ref_dump (ref, file); |
57512f53 | 2308 | ref = DF_REF_NEXT_REG (ref); |
4d779342 DB |
2309 | } |
2310 | fprintf (file, "}"); | |
2311 | } | |
2312 | ||
2313 | ||
23249ac4 | 2314 | static void |
b512946c | 2315 | df_mws_dump (struct df_mw_hardreg *mws, FILE *file) |
4d779342 | 2316 | { |
b512946c RS |
2317 | for (; mws; mws = DF_MWS_NEXT (mws)) |
2318 | fprintf (file, "mw %c r[%d..%d]\n", | |
2319 | DF_MWS_REG_DEF_P (mws) ? 'd' : 'u', | |
2320 | mws->start_regno, mws->end_regno); | |
23249ac4 DB |
2321 | } |
2322 | ||
2323 | ||
b8698a0f L |
2324 | static void |
2325 | df_insn_uid_debug (unsigned int uid, | |
23249ac4 DB |
2326 | bool follow_chain, FILE *file) |
2327 | { | |
6fb5fa3c DB |
2328 | fprintf (file, "insn %d luid %d", |
2329 | uid, DF_INSN_UID_LUID (uid)); | |
4d779342 | 2330 | |
6fb5fa3c | 2331 | if (DF_INSN_UID_DEFS (uid)) |
23249ac4 DB |
2332 | { |
2333 | fprintf (file, " defs "); | |
6fb5fa3c | 2334 | df_refs_chain_dump (DF_INSN_UID_DEFS (uid), follow_chain, file); |
23249ac4 DB |
2335 | } |
2336 | ||
6fb5fa3c | 2337 | if (DF_INSN_UID_USES (uid)) |
23249ac4 DB |
2338 | { |
2339 | fprintf (file, " uses "); | |
6fb5fa3c DB |
2340 | df_refs_chain_dump (DF_INSN_UID_USES (uid), follow_chain, file); |
2341 | } | |
2342 | ||
2343 | if (DF_INSN_UID_EQ_USES (uid)) | |
2344 | { | |
2345 | fprintf (file, " eq uses "); | |
2346 | df_refs_chain_dump (DF_INSN_UID_EQ_USES (uid), follow_chain, file); | |
23249ac4 DB |
2347 | } |
2348 | ||
6fb5fa3c | 2349 | if (DF_INSN_UID_MWS (uid)) |
23249ac4 DB |
2350 | { |
2351 | fprintf (file, " mws "); | |
6fb5fa3c | 2352 | df_mws_dump (DF_INSN_UID_MWS (uid), file); |
23249ac4 | 2353 | } |
4d779342 DB |
2354 | fprintf (file, "\n"); |
2355 | } | |
2356 | ||
23249ac4 | 2357 | |
24e47c76 | 2358 | DEBUG_FUNCTION void |
b2908ba6 | 2359 | df_insn_debug (rtx_insn *insn, bool follow_chain, FILE *file) |
23249ac4 | 2360 | { |
6fb5fa3c | 2361 | df_insn_uid_debug (INSN_UID (insn), follow_chain, file); |
23249ac4 DB |
2362 | } |
2363 | ||
24e47c76 | 2364 | DEBUG_FUNCTION void |
b2908ba6 | 2365 | df_insn_debug_regno (rtx_insn *insn, FILE *file) |
4d779342 | 2366 | { |
50e94c7e | 2367 | struct df_insn_info *insn_info = DF_INSN_INFO_GET (insn); |
4d779342 DB |
2368 | |
2369 | fprintf (file, "insn %d bb %d luid %d defs ", | |
50e94c7e SB |
2370 | INSN_UID (insn), BLOCK_FOR_INSN (insn)->index, |
2371 | DF_INSN_INFO_LUID (insn_info)); | |
2372 | df_refs_chain_dump (DF_INSN_INFO_DEFS (insn_info), false, file); | |
b8698a0f | 2373 | |
4d779342 | 2374 | fprintf (file, " uses "); |
50e94c7e | 2375 | df_refs_chain_dump (DF_INSN_INFO_USES (insn_info), false, file); |
6fb5fa3c DB |
2376 | |
2377 | fprintf (file, " eq_uses "); | |
50e94c7e | 2378 | df_refs_chain_dump (DF_INSN_INFO_EQ_USES (insn_info), false, file); |
4d779342 DB |
2379 | fprintf (file, "\n"); |
2380 | } | |
2381 | ||
24e47c76 | 2382 | DEBUG_FUNCTION void |
6fb5fa3c | 2383 | df_regno_debug (unsigned int regno, FILE *file) |
4d779342 DB |
2384 | { |
2385 | fprintf (file, "reg %d defs ", regno); | |
6fb5fa3c | 2386 | df_regs_chain_dump (DF_REG_DEF_CHAIN (regno), file); |
4d779342 | 2387 | fprintf (file, " uses "); |
6fb5fa3c DB |
2388 | df_regs_chain_dump (DF_REG_USE_CHAIN (regno), file); |
2389 | fprintf (file, " eq_uses "); | |
2390 | df_regs_chain_dump (DF_REG_EQ_USE_CHAIN (regno), file); | |
4d779342 DB |
2391 | fprintf (file, "\n"); |
2392 | } | |
2393 | ||
2394 | ||
24e47c76 | 2395 | DEBUG_FUNCTION void |
57512f53 | 2396 | df_ref_debug (df_ref ref, FILE *file) |
4d779342 DB |
2397 | { |
2398 | fprintf (file, "%c%d ", | |
2399 | DF_REF_REG_DEF_P (ref) ? 'd' : 'u', | |
2400 | DF_REF_ID (ref)); | |
a3f1cee4 | 2401 | fprintf (file, "reg %d bb %d insn %d flag %#x type %#x ", |
4d779342 DB |
2402 | DF_REF_REGNO (ref), |
2403 | DF_REF_BBNO (ref), | |
57512f53 | 2404 | DF_REF_IS_ARTIFICIAL (ref) ? -1 : DF_REF_INSN_UID (ref), |
6fb5fa3c DB |
2405 | DF_REF_FLAGS (ref), |
2406 | DF_REF_TYPE (ref)); | |
2407 | if (DF_REF_LOC (ref)) | |
8588f797 AO |
2408 | { |
2409 | if (flag_dump_noaddr) | |
2410 | fprintf (file, "loc #(#) chain "); | |
2411 | else | |
2412 | fprintf (file, "loc %p(%p) chain ", (void *)DF_REF_LOC (ref), | |
2413 | (void *)*DF_REF_LOC (ref)); | |
2414 | } | |
6fb5fa3c DB |
2415 | else |
2416 | fprintf (file, "chain "); | |
23249ac4 | 2417 | df_chain_dump (DF_REF_CHAIN (ref), file); |
4d779342 DB |
2418 | fprintf (file, "\n"); |
2419 | } | |
2420 | \f | |
2421 | /* Functions for debugging from GDB. */ | |
2422 | ||
24e47c76 | 2423 | DEBUG_FUNCTION void |
b2908ba6 | 2424 | debug_df_insn (rtx_insn *insn) |
4d779342 | 2425 | { |
6fb5fa3c | 2426 | df_insn_debug (insn, true, stderr); |
4d779342 DB |
2427 | debug_rtx (insn); |
2428 | } | |
2429 | ||
2430 | ||
24e47c76 | 2431 | DEBUG_FUNCTION void |
4d779342 DB |
2432 | debug_df_reg (rtx reg) |
2433 | { | |
6fb5fa3c | 2434 | df_regno_debug (REGNO (reg), stderr); |
4d779342 DB |
2435 | } |
2436 | ||
2437 | ||
24e47c76 | 2438 | DEBUG_FUNCTION void |
4d779342 DB |
2439 | debug_df_regno (unsigned int regno) |
2440 | { | |
6fb5fa3c | 2441 | df_regno_debug (regno, stderr); |
4d779342 DB |
2442 | } |
2443 | ||
2444 | ||
24e47c76 | 2445 | DEBUG_FUNCTION void |
57512f53 | 2446 | debug_df_ref (df_ref ref) |
4d779342 | 2447 | { |
23249ac4 | 2448 | df_ref_debug (ref, stderr); |
4d779342 DB |
2449 | } |
2450 | ||
2451 | ||
24e47c76 | 2452 | DEBUG_FUNCTION void |
4d779342 DB |
2453 | debug_df_defno (unsigned int defno) |
2454 | { | |
6fb5fa3c | 2455 | df_ref_debug (DF_DEFS_GET (defno), stderr); |
4d779342 DB |
2456 | } |
2457 | ||
2458 | ||
24e47c76 | 2459 | DEBUG_FUNCTION void |
4d779342 DB |
2460 | debug_df_useno (unsigned int defno) |
2461 | { | |
6fb5fa3c | 2462 | df_ref_debug (DF_USES_GET (defno), stderr); |
4d779342 DB |
2463 | } |
2464 | ||
2465 | ||
24e47c76 | 2466 | DEBUG_FUNCTION void |
4d779342 DB |
2467 | debug_df_chain (struct df_link *link) |
2468 | { | |
23249ac4 | 2469 | df_chain_dump (link, stderr); |
4d779342 DB |
2470 | fputc ('\n', stderr); |
2471 | } |