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6de9cd9a | 1 | /* Data flow functions for trees. |
cbe34bb5 | 2 | Copyright (C) 2001-2017 Free Software Foundation, Inc. |
6de9cd9a DN |
3 | Contributed by Diego Novillo <dnovillo@redhat.com> |
4 | ||
5 | This file is part of GCC. | |
6 | ||
7 | GCC is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9dcd6f09 | 9 | the Free Software Foundation; either version 3, or (at your option) |
6de9cd9a DN |
10 | any later version. |
11 | ||
12 | GCC is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
9dcd6f09 NC |
18 | along with GCC; see the file COPYING3. If not see |
19 | <http://www.gnu.org/licenses/>. */ | |
6de9cd9a DN |
20 | |
21 | #include "config.h" | |
22 | #include "system.h" | |
23 | #include "coretypes.h" | |
c7131fb2 | 24 | #include "backend.h" |
957060b5 | 25 | #include "rtl.h" |
6de9cd9a | 26 | #include "tree.h" |
c7131fb2 | 27 | #include "gimple.h" |
957060b5 | 28 | #include "tree-pass.h" |
c7131fb2 | 29 | #include "ssa.h" |
957060b5 | 30 | #include "tree-pretty-print.h" |
40e23961 | 31 | #include "fold-const.h" |
d8a2d370 | 32 | #include "stor-layout.h" |
60393bbc | 33 | #include "langhooks.h" |
5be5c238 AM |
34 | #include "gimple-iterator.h" |
35 | #include "gimple-walk.h" | |
442b4905 | 36 | #include "tree-dfa.h" |
6de9cd9a DN |
37 | |
38 | /* Build and maintain data flow information for trees. */ | |
39 | ||
40 | /* Counters used to display DFA and SSA statistics. */ | |
41 | struct dfa_stats_d | |
42 | { | |
6de9cd9a DN |
43 | long num_defs; |
44 | long num_uses; | |
45 | long num_phis; | |
46 | long num_phi_args; | |
726a989a | 47 | size_t max_num_phi_args; |
38635499 | 48 | long num_vdefs; |
6de9cd9a DN |
49 | long num_vuses; |
50 | }; | |
51 | ||
52 | ||
6de9cd9a DN |
53 | /* Local functions. */ |
54 | static void collect_dfa_stats (struct dfa_stats_d *); | |
6de9cd9a DN |
55 | |
56 | ||
6de9cd9a DN |
57 | /*--------------------------------------------------------------------------- |
58 | Dataflow analysis (DFA) routines | |
59 | ---------------------------------------------------------------------------*/ | |
6de9cd9a | 60 | |
908ff6a3 KZ |
61 | /* Renumber all of the gimple stmt uids. */ |
62 | ||
b8698a0f | 63 | void |
908ff6a3 KZ |
64 | renumber_gimple_stmt_uids (void) |
65 | { | |
66 | basic_block bb; | |
67 | ||
68 | set_gimple_stmt_max_uid (cfun, 0); | |
04a90bec | 69 | FOR_ALL_BB_FN (bb, cfun) |
908ff6a3 | 70 | { |
726a989a | 71 | gimple_stmt_iterator bsi; |
8f984534 RB |
72 | for (bsi = gsi_start_phis (bb); !gsi_end_p (bsi); gsi_next (&bsi)) |
73 | { | |
355fe088 | 74 | gimple *stmt = gsi_stmt (bsi); |
8f984534 RB |
75 | gimple_set_uid (stmt, inc_gimple_stmt_max_uid (cfun)); |
76 | } | |
726a989a | 77 | for (bsi = gsi_start_bb (bb); !gsi_end_p (bsi); gsi_next (&bsi)) |
908ff6a3 | 78 | { |
355fe088 | 79 | gimple *stmt = gsi_stmt (bsi); |
726a989a | 80 | gimple_set_uid (stmt, inc_gimple_stmt_max_uid (cfun)); |
908ff6a3 KZ |
81 | } |
82 | } | |
83 | } | |
84 | ||
2c08497a BS |
85 | /* Like renumber_gimple_stmt_uids, but only do work on the basic blocks |
86 | in BLOCKS, of which there are N_BLOCKS. Also renumbers PHIs. */ | |
87 | ||
b8698a0f | 88 | void |
2c08497a BS |
89 | renumber_gimple_stmt_uids_in_blocks (basic_block *blocks, int n_blocks) |
90 | { | |
91 | int i; | |
92 | ||
93 | set_gimple_stmt_max_uid (cfun, 0); | |
94 | for (i = 0; i < n_blocks; i++) | |
95 | { | |
96 | basic_block bb = blocks[i]; | |
97 | gimple_stmt_iterator bsi; | |
98 | for (bsi = gsi_start_phis (bb); !gsi_end_p (bsi); gsi_next (&bsi)) | |
99 | { | |
355fe088 | 100 | gimple *stmt = gsi_stmt (bsi); |
2c08497a BS |
101 | gimple_set_uid (stmt, inc_gimple_stmt_max_uid (cfun)); |
102 | } | |
103 | for (bsi = gsi_start_bb (bb); !gsi_end_p (bsi); gsi_next (&bsi)) | |
104 | { | |
355fe088 | 105 | gimple *stmt = gsi_stmt (bsi); |
2c08497a BS |
106 | gimple_set_uid (stmt, inc_gimple_stmt_max_uid (cfun)); |
107 | } | |
108 | } | |
109 | } | |
110 | ||
571325db | 111 | |
6de9cd9a DN |
112 | |
113 | /*--------------------------------------------------------------------------- | |
114 | Debugging functions | |
115 | ---------------------------------------------------------------------------*/ | |
6de9cd9a DN |
116 | |
117 | /* Dump variable VAR and its may-aliases to FILE. */ | |
118 | ||
119 | void | |
120 | dump_variable (FILE *file, tree var) | |
121 | { | |
d8903b30 DN |
122 | if (TREE_CODE (var) == SSA_NAME) |
123 | { | |
124 | if (POINTER_TYPE_P (TREE_TYPE (var))) | |
125 | dump_points_to_info_for (file, var); | |
126 | var = SSA_NAME_VAR (var); | |
127 | } | |
6de9cd9a DN |
128 | |
129 | if (var == NULL_TREE) | |
130 | { | |
131 | fprintf (file, "<nil>"); | |
132 | return; | |
133 | } | |
134 | ||
135 | print_generic_expr (file, var, dump_flags); | |
6de9cd9a | 136 | |
ea53115f | 137 | fprintf (file, ", UID D.%u", (unsigned) DECL_UID (var)); |
25a6a873 RG |
138 | if (DECL_PT_UID (var) != DECL_UID (var)) |
139 | fprintf (file, ", PT-UID D.%u", (unsigned) DECL_PT_UID (var)); | |
6de9cd9a | 140 | |
1810f6ed DN |
141 | fprintf (file, ", "); |
142 | print_generic_expr (file, TREE_TYPE (var), dump_flags); | |
143 | ||
c597ef4e DN |
144 | if (TREE_ADDRESSABLE (var)) |
145 | fprintf (file, ", is addressable"); | |
b8698a0f | 146 | |
c597ef4e DN |
147 | if (is_global_var (var)) |
148 | fprintf (file, ", is global"); | |
6de9cd9a | 149 | |
c04f07f4 DN |
150 | if (TREE_THIS_VOLATILE (var)) |
151 | fprintf (file, ", is volatile"); | |
152 | ||
32244553 | 153 | if (cfun && ssa_default_def (cfun, var)) |
6de9cd9a DN |
154 | { |
155 | fprintf (file, ", default def: "); | |
32244553 | 156 | print_generic_expr (file, ssa_default_def (cfun, var), dump_flags); |
6de9cd9a DN |
157 | } |
158 | ||
66350781 DN |
159 | if (DECL_INITIAL (var)) |
160 | { | |
161 | fprintf (file, ", initial: "); | |
162 | print_generic_expr (file, DECL_INITIAL (var), dump_flags); | |
163 | } | |
164 | ||
6de9cd9a DN |
165 | fprintf (file, "\n"); |
166 | } | |
167 | ||
168 | ||
169 | /* Dump variable VAR and its may-aliases to stderr. */ | |
170 | ||
24e47c76 | 171 | DEBUG_FUNCTION void |
6de9cd9a DN |
172 | debug_variable (tree var) |
173 | { | |
174 | dump_variable (stderr, var); | |
175 | } | |
176 | ||
177 | ||
6de9cd9a DN |
178 | /* Dump various DFA statistics to FILE. */ |
179 | ||
180 | void | |
181 | dump_dfa_stats (FILE *file) | |
182 | { | |
183 | struct dfa_stats_d dfa_stats; | |
184 | ||
185 | unsigned long size, total = 0; | |
186 | const char * const fmt_str = "%-30s%-13s%12s\n"; | |
187 | const char * const fmt_str_1 = "%-30s%13lu%11lu%c\n"; | |
188 | const char * const fmt_str_3 = "%-43s%11lu%c\n"; | |
189 | const char *funcname | |
673fda6b | 190 | = lang_hooks.decl_printable_name (current_function_decl, 2); |
6de9cd9a DN |
191 | |
192 | collect_dfa_stats (&dfa_stats); | |
193 | ||
194 | fprintf (file, "\nDFA Statistics for %s\n\n", funcname); | |
195 | ||
196 | fprintf (file, "---------------------------------------------------------\n"); | |
197 | fprintf (file, fmt_str, "", " Number of ", "Memory"); | |
198 | fprintf (file, fmt_str, "", " instances ", "used "); | |
199 | fprintf (file, "---------------------------------------------------------\n"); | |
200 | ||
6de9cd9a DN |
201 | size = dfa_stats.num_uses * sizeof (tree *); |
202 | total += size; | |
203 | fprintf (file, fmt_str_1, "USE operands", dfa_stats.num_uses, | |
204 | SCALE (size), LABEL (size)); | |
205 | ||
206 | size = dfa_stats.num_defs * sizeof (tree *); | |
207 | total += size; | |
208 | fprintf (file, fmt_str_1, "DEF operands", dfa_stats.num_defs, | |
209 | SCALE (size), LABEL (size)); | |
210 | ||
211 | size = dfa_stats.num_vuses * sizeof (tree *); | |
212 | total += size; | |
213 | fprintf (file, fmt_str_1, "VUSE operands", dfa_stats.num_vuses, | |
214 | SCALE (size), LABEL (size)); | |
215 | ||
38635499 | 216 | size = dfa_stats.num_vdefs * sizeof (tree *); |
a32b97a2 | 217 | total += size; |
38635499 | 218 | fprintf (file, fmt_str_1, "VDEF operands", dfa_stats.num_vdefs, |
6de9cd9a DN |
219 | SCALE (size), LABEL (size)); |
220 | ||
538dd0b7 | 221 | size = dfa_stats.num_phis * sizeof (struct gphi); |
6de9cd9a DN |
222 | total += size; |
223 | fprintf (file, fmt_str_1, "PHI nodes", dfa_stats.num_phis, | |
224 | SCALE (size), LABEL (size)); | |
225 | ||
226 | size = dfa_stats.num_phi_args * sizeof (struct phi_arg_d); | |
227 | total += size; | |
228 | fprintf (file, fmt_str_1, "PHI arguments", dfa_stats.num_phi_args, | |
229 | SCALE (size), LABEL (size)); | |
230 | ||
231 | fprintf (file, "---------------------------------------------------------\n"); | |
232 | fprintf (file, fmt_str_3, "Total memory used by DFA/SSA data", SCALE (total), | |
233 | LABEL (total)); | |
234 | fprintf (file, "---------------------------------------------------------\n"); | |
235 | fprintf (file, "\n"); | |
236 | ||
237 | if (dfa_stats.num_phis) | |
726a989a | 238 | fprintf (file, "Average number of arguments per PHI node: %.1f (max: %ld)\n", |
6de9cd9a | 239 | (float) dfa_stats.num_phi_args / (float) dfa_stats.num_phis, |
726a989a | 240 | (long) dfa_stats.max_num_phi_args); |
6de9cd9a DN |
241 | |
242 | fprintf (file, "\n"); | |
243 | } | |
244 | ||
245 | ||
246 | /* Dump DFA statistics on stderr. */ | |
247 | ||
24e47c76 | 248 | DEBUG_FUNCTION void |
6de9cd9a DN |
249 | debug_dfa_stats (void) |
250 | { | |
251 | dump_dfa_stats (stderr); | |
252 | } | |
253 | ||
254 | ||
206048bd | 255 | /* Collect DFA statistics and store them in the structure pointed to by |
6de9cd9a DN |
256 | DFA_STATS_P. */ |
257 | ||
258 | static void | |
726a989a | 259 | collect_dfa_stats (struct dfa_stats_d *dfa_stats_p ATTRIBUTE_UNUSED) |
6de9cd9a | 260 | { |
6de9cd9a | 261 | basic_block bb; |
6de9cd9a | 262 | |
1e128c5f | 263 | gcc_assert (dfa_stats_p); |
6de9cd9a DN |
264 | |
265 | memset ((void *)dfa_stats_p, 0, sizeof (struct dfa_stats_d)); | |
266 | ||
726a989a | 267 | /* Walk all the statements in the function counting references. */ |
11cd3bed | 268 | FOR_EACH_BB_FN (bb, cfun) |
6de9cd9a | 269 | { |
538dd0b7 DM |
270 | for (gphi_iterator si = gsi_start_phis (bb); !gsi_end_p (si); |
271 | gsi_next (&si)) | |
6de9cd9a | 272 | { |
538dd0b7 | 273 | gphi *phi = si.phi (); |
6de9cd9a | 274 | dfa_stats_p->num_phis++; |
726a989a RB |
275 | dfa_stats_p->num_phi_args += gimple_phi_num_args (phi); |
276 | if (gimple_phi_num_args (phi) > dfa_stats_p->max_num_phi_args) | |
277 | dfa_stats_p->max_num_phi_args = gimple_phi_num_args (phi); | |
6de9cd9a | 278 | } |
6de9cd9a | 279 | |
538dd0b7 DM |
280 | for (gimple_stmt_iterator si = gsi_start_bb (bb); !gsi_end_p (si); |
281 | gsi_next (&si)) | |
6de9cd9a | 282 | { |
355fe088 | 283 | gimple *stmt = gsi_stmt (si); |
726a989a RB |
284 | dfa_stats_p->num_defs += NUM_SSA_OPERANDS (stmt, SSA_OP_DEF); |
285 | dfa_stats_p->num_uses += NUM_SSA_OPERANDS (stmt, SSA_OP_USE); | |
5006671f RG |
286 | dfa_stats_p->num_vdefs += gimple_vdef (stmt) ? 1 : 0; |
287 | dfa_stats_p->num_vuses += gimple_vuse (stmt) ? 1 : 0; | |
6de9cd9a DN |
288 | } |
289 | } | |
6de9cd9a DN |
290 | } |
291 | ||
292 | ||
293 | /*--------------------------------------------------------------------------- | |
294 | Miscellaneous helpers | |
295 | ---------------------------------------------------------------------------*/ | |
a3648cfc | 296 | |
86051306 JH |
297 | /* Lookup VAR UID in the default_defs hashtable and return the associated |
298 | variable. */ | |
299 | ||
b8698a0f | 300 | tree |
32244553 | 301 | ssa_default_def (struct function *fn, tree var) |
86051306 | 302 | { |
e445a2ff RG |
303 | struct tree_decl_minimal ind; |
304 | struct tree_ssa_name in; | |
8813a647 | 305 | gcc_assert (VAR_P (var) |
32244553 RG |
306 | || TREE_CODE (var) == PARM_DECL |
307 | || TREE_CODE (var) == RESULT_DECL); | |
51b86113 DM |
308 | |
309 | /* Always NULL_TREE for rtl function dumps. */ | |
310 | if (!fn->gimple_df) | |
311 | return NULL_TREE; | |
312 | ||
e445a2ff RG |
313 | in.var = (tree)&ind; |
314 | ind.uid = DECL_UID (var); | |
2a22f99c | 315 | return DEFAULT_DEFS (fn)->find_with_hash ((tree)&in, DECL_UID (var)); |
86051306 JH |
316 | } |
317 | ||
32244553 RG |
318 | /* Insert the pair VAR's UID, DEF into the default_defs hashtable |
319 | of function FN. */ | |
86051306 JH |
320 | |
321 | void | |
32244553 | 322 | set_ssa_default_def (struct function *fn, tree var, tree def) |
b8698a0f | 323 | { |
e445a2ff RG |
324 | struct tree_decl_minimal ind; |
325 | struct tree_ssa_name in; | |
86051306 | 326 | |
8813a647 | 327 | gcc_assert (VAR_P (var) |
32244553 RG |
328 | || TREE_CODE (var) == PARM_DECL |
329 | || TREE_CODE (var) == RESULT_DECL); | |
e445a2ff RG |
330 | in.var = (tree)&ind; |
331 | ind.uid = DECL_UID (var); | |
332 | if (!def) | |
86051306 | 333 | { |
2a22f99c TS |
334 | tree *loc = DEFAULT_DEFS (fn)->find_slot_with_hash ((tree)&in, |
335 | DECL_UID (var), | |
336 | NO_INSERT); | |
2044a4c3 | 337 | if (loc) |
01c59d23 RG |
338 | { |
339 | SSA_NAME_IS_DEFAULT_DEF (*(tree *)loc) = false; | |
2a22f99c | 340 | DEFAULT_DEFS (fn)->clear_slot (loc); |
01c59d23 | 341 | } |
86051306 JH |
342 | return; |
343 | } | |
e445a2ff | 344 | gcc_assert (TREE_CODE (def) == SSA_NAME && SSA_NAME_VAR (def) == var); |
2a22f99c TS |
345 | tree *loc = DEFAULT_DEFS (fn)->find_slot_with_hash ((tree)&in, |
346 | DECL_UID (var), INSERT); | |
38635499 | 347 | |
86051306 | 348 | /* Default definition might be changed by tail call optimization. */ |
e445a2ff | 349 | if (*loc) |
2a22f99c | 350 | SSA_NAME_IS_DEFAULT_DEF (*loc) = false; |
cfaab3a9 DN |
351 | |
352 | /* Mark DEF as the default definition for VAR. */ | |
2a22f99c | 353 | *loc = def; |
01c59d23 | 354 | SSA_NAME_IS_DEFAULT_DEF (def) = true; |
86051306 JH |
355 | } |
356 | ||
32244553 RG |
357 | /* Retrieve or create a default definition for VAR. */ |
358 | ||
359 | tree | |
360 | get_or_create_ssa_default_def (struct function *fn, tree var) | |
361 | { | |
362 | tree ddef = ssa_default_def (fn, var); | |
363 | if (ddef == NULL_TREE) | |
364 | { | |
f3a1fb91 MJ |
365 | ddef = make_ssa_name_fn (fn, var, gimple_build_nop ()); |
366 | set_ssa_default_def (fn, var, ddef); | |
32244553 RG |
367 | } |
368 | return ddef; | |
369 | } | |
370 | ||
6de9cd9a | 371 | |
cfaab3a9 | 372 | /* If EXP is a handled component reference for a structure, return the |
6bec9271 RG |
373 | base variable. The access range is delimited by bit positions *POFFSET and |
374 | *POFFSET + *PMAX_SIZE. The access size is *PSIZE bits. If either | |
375 | *PSIZE or *PMAX_SIZE is -1, they could not be determined. If *PSIZE | |
ee45a32d EB |
376 | and *PMAX_SIZE are equal, the access is non-variable. If *PREVERSE is |
377 | true, the storage order of the reference is reversed. */ | |
c75ab022 DB |
378 | |
379 | tree | |
588db50c RS |
380 | get_ref_base_and_extent (tree exp, poly_int64_pod *poffset, |
381 | poly_int64_pod *psize, | |
382 | poly_int64_pod *pmax_size, | |
ee45a32d | 383 | bool *preverse) |
c75ab022 | 384 | { |
588db50c RS |
385 | poly_offset_int bitsize = -1; |
386 | poly_offset_int maxsize; | |
6bec9271 | 387 | tree size_tree = NULL_TREE; |
588db50c | 388 | poly_offset_int bit_offset = 0; |
00e85045 | 389 | bool seen_variable_array_ref = false; |
6bec9271 | 390 | |
ee45a32d EB |
391 | /* First get the final access size and the storage order from just the |
392 | outermost expression. */ | |
6bec9271 RG |
393 | if (TREE_CODE (exp) == COMPONENT_REF) |
394 | size_tree = DECL_SIZE (TREE_OPERAND (exp, 1)); | |
395 | else if (TREE_CODE (exp) == BIT_FIELD_REF) | |
396 | size_tree = TREE_OPERAND (exp, 1); | |
55b34b5f | 397 | else if (!VOID_TYPE_P (TREE_TYPE (exp))) |
c75ab022 | 398 | { |
ef4bddc2 | 399 | machine_mode mode = TYPE_MODE (TREE_TYPE (exp)); |
6bec9271 RG |
400 | if (mode == BLKmode) |
401 | size_tree = TYPE_SIZE (TREE_TYPE (exp)); | |
402 | else | |
588db50c | 403 | bitsize = GET_MODE_BITSIZE (mode); |
c75ab022 | 404 | } |
5b5d7f31 | 405 | if (size_tree != NULL_TREE |
588db50c RS |
406 | && poly_int_tree_p (size_tree)) |
407 | bitsize = wi::to_poly_offset (size_tree); | |
6bec9271 | 408 | |
ee45a32d EB |
409 | *preverse = reverse_storage_order_for_component_p (exp); |
410 | ||
6bec9271 RG |
411 | /* Initially, maxsize is the same as the accessed element size. |
412 | In the following it will only grow (or become -1). */ | |
413 | maxsize = bitsize; | |
414 | ||
415 | /* Compute cumulative bit-offset for nested component-refs and array-refs, | |
416 | and find the ultimate containing object. */ | |
417 | while (1) | |
418 | { | |
419 | switch (TREE_CODE (exp)) | |
420 | { | |
421 | case BIT_FIELD_REF: | |
588db50c | 422 | bit_offset += wi::to_poly_offset (TREE_OPERAND (exp, 2)); |
6bec9271 RG |
423 | break; |
424 | ||
425 | case COMPONENT_REF: | |
426 | { | |
427 | tree field = TREE_OPERAND (exp, 1); | |
428 | tree this_offset = component_ref_field_offset (exp); | |
429 | ||
588db50c | 430 | if (this_offset && poly_int_tree_p (this_offset)) |
6bec9271 | 431 | { |
588db50c RS |
432 | poly_offset_int woffset = (wi::to_poly_offset (this_offset) |
433 | << LOG2_BITS_PER_UNIT); | |
807e902e KZ |
434 | woffset += wi::to_offset (DECL_FIELD_BIT_OFFSET (field)); |
435 | bit_offset += woffset; | |
79441eca RG |
436 | |
437 | /* If we had seen a variable array ref already and we just | |
438 | referenced the last field of a struct or a union member | |
439 | then we have to adjust maxsize by the padding at the end | |
440 | of our field. */ | |
588db50c | 441 | if (seen_variable_array_ref && known_size_p (maxsize)) |
79441eca RG |
442 | { |
443 | tree stype = TREE_TYPE (TREE_OPERAND (exp, 0)); | |
910ad8de | 444 | tree next = DECL_CHAIN (field); |
79441eca | 445 | while (next && TREE_CODE (next) != FIELD_DECL) |
910ad8de | 446 | next = DECL_CHAIN (next); |
79441eca RG |
447 | if (!next |
448 | || TREE_CODE (stype) != RECORD_TYPE) | |
449 | { | |
450 | tree fsize = DECL_SIZE_UNIT (field); | |
451 | tree ssize = TYPE_SIZE_UNIT (stype); | |
5b5d7f31 | 452 | if (fsize == NULL |
588db50c | 453 | || !poly_int_tree_p (fsize) |
5b5d7f31 | 454 | || ssize == NULL |
588db50c | 455 | || !poly_int_tree_p (ssize)) |
807e902e | 456 | maxsize = -1; |
79441eca | 457 | else |
5b5d7f31 | 458 | { |
588db50c RS |
459 | poly_offset_int tem |
460 | = (wi::to_poly_offset (ssize) | |
461 | - wi::to_poly_offset (fsize)); | |
8de73453 | 462 | tem <<= LOG2_BITS_PER_UNIT; |
807e902e | 463 | tem -= woffset; |
5b5d7f31 JJ |
464 | maxsize += tem; |
465 | } | |
79441eca RG |
466 | } |
467 | } | |
6bec9271 RG |
468 | } |
469 | else | |
470 | { | |
471 | tree csize = TYPE_SIZE (TREE_TYPE (TREE_OPERAND (exp, 0))); | |
472 | /* We need to adjust maxsize to the whole structure bitsize. | |
fa10beec | 473 | But we can subtract any constant offset seen so far, |
6bec9271 | 474 | because that would get us out of the structure otherwise. */ |
588db50c | 475 | if (known_size_p (maxsize) |
ca8d9092 | 476 | && csize |
588db50c RS |
477 | && poly_int_tree_p (csize)) |
478 | maxsize = wi::to_poly_offset (csize) - bit_offset; | |
6bec9271 | 479 | else |
807e902e | 480 | maxsize = -1; |
6bec9271 RG |
481 | } |
482 | } | |
483 | break; | |
484 | ||
485 | case ARRAY_REF: | |
486 | case ARRAY_RANGE_REF: | |
487 | { | |
488 | tree index = TREE_OPERAND (exp, 1); | |
821bb7f8 | 489 | tree low_bound, unit_size; |
6bec9271 | 490 | |
c21c775a | 491 | /* If the resulting bit-offset is constant, track it. */ |
588db50c | 492 | if (poly_int_tree_p (index) |
821bb7f8 | 493 | && (low_bound = array_ref_low_bound (exp), |
588db50c | 494 | poly_int_tree_p (low_bound)) |
821bb7f8 | 495 | && (unit_size = array_ref_element_size (exp), |
ca8d9092 | 496 | TREE_CODE (unit_size) == INTEGER_CST)) |
6bec9271 | 497 | { |
588db50c RS |
498 | poly_offset_int woffset |
499 | = wi::sext (wi::to_poly_offset (index) | |
500 | - wi::to_poly_offset (low_bound), | |
807e902e KZ |
501 | TYPE_PRECISION (TREE_TYPE (index))); |
502 | woffset *= wi::to_offset (unit_size); | |
8de73453 | 503 | woffset <<= LOG2_BITS_PER_UNIT; |
807e902e | 504 | bit_offset += woffset; |
00e85045 RG |
505 | |
506 | /* An array ref with a constant index up in the structure | |
507 | hierarchy will constrain the size of any variable array ref | |
508 | lower in the access hierarchy. */ | |
509 | seen_variable_array_ref = false; | |
6bec9271 RG |
510 | } |
511 | else | |
512 | { | |
513 | tree asize = TYPE_SIZE (TREE_TYPE (TREE_OPERAND (exp, 0))); | |
514 | /* We need to adjust maxsize to the whole array bitsize. | |
fa10beec | 515 | But we can subtract any constant offset seen so far, |
6bec9271 | 516 | because that would get us outside of the array otherwise. */ |
588db50c | 517 | if (known_size_p (maxsize) |
ca8d9092 | 518 | && asize |
588db50c RS |
519 | && poly_int_tree_p (asize)) |
520 | maxsize = wi::to_poly_offset (asize) - bit_offset; | |
6bec9271 | 521 | else |
807e902e | 522 | maxsize = -1; |
00e85045 RG |
523 | |
524 | /* Remember that we have seen an array ref with a variable | |
525 | index. */ | |
526 | seen_variable_array_ref = true; | |
6bec9271 RG |
527 | } |
528 | } | |
529 | break; | |
530 | ||
531 | case REALPART_EXPR: | |
532 | break; | |
533 | ||
534 | case IMAGPART_EXPR: | |
5b5d7f31 | 535 | bit_offset += bitsize; |
6bec9271 RG |
536 | break; |
537 | ||
538 | case VIEW_CONVERT_EXPR: | |
6bec9271 RG |
539 | break; |
540 | ||
4f94d87c RB |
541 | case TARGET_MEM_REF: |
542 | /* Via the variable index or index2 we can reach the | |
543 | whole object. Still hand back the decl here. */ | |
544 | if (TREE_CODE (TMR_BASE (exp)) == ADDR_EXPR | |
545 | && (TMR_INDEX (exp) || TMR_INDEX2 (exp))) | |
546 | { | |
547 | exp = TREE_OPERAND (TMR_BASE (exp), 0); | |
807e902e KZ |
548 | bit_offset = 0; |
549 | maxsize = -1; | |
4f94d87c RB |
550 | goto done; |
551 | } | |
552 | /* Fallthru. */ | |
70f34814 | 553 | case MEM_REF: |
4f94d87c RB |
554 | /* We need to deal with variable arrays ending structures such as |
555 | struct { int length; int a[1]; } x; x.a[d] | |
556 | struct { struct { int a; int b; } a[1]; } x; x.a[d].a | |
557 | struct { struct { int a[1]; } a[1]; } x; x.a[0][d], x.a[d][0] | |
558 | struct { int len; union { int a[1]; struct X x; } u; } x; x.u.a[d] | |
559 | where we do not know maxsize for variable index accesses to | |
560 | the array. The simplest way to conservatively deal with this | |
561 | is to punt in the case that offset + maxsize reaches the | |
562 | base type boundary. This needs to include possible trailing | |
563 | padding that is there for alignment purposes. */ | |
564 | if (seen_variable_array_ref | |
588db50c | 565 | && known_size_p (maxsize) |
5b5d7f31 | 566 | && (TYPE_SIZE (TREE_TYPE (exp)) == NULL_TREE |
588db50c RS |
567 | || !poly_int_tree_p (TYPE_SIZE (TREE_TYPE (exp))) |
568 | || (maybe_eq | |
569 | (bit_offset + maxsize, | |
570 | wi::to_poly_offset (TYPE_SIZE (TREE_TYPE (exp))))))) | |
807e902e | 571 | maxsize = -1; |
4f94d87c | 572 | |
70f34814 RG |
573 | /* Hand back the decl for MEM[&decl, off]. */ |
574 | if (TREE_CODE (TREE_OPERAND (exp, 0)) == ADDR_EXPR) | |
575 | { | |
576 | if (integer_zerop (TREE_OPERAND (exp, 1))) | |
577 | exp = TREE_OPERAND (TREE_OPERAND (exp, 0), 0); | |
4b228e61 RG |
578 | else |
579 | { | |
588db50c | 580 | poly_offset_int off = mem_ref_offset (exp); |
8de73453 | 581 | off <<= LOG2_BITS_PER_UNIT; |
27bcd47c | 582 | off += bit_offset; |
588db50c RS |
583 | poly_int64 off_hwi; |
584 | if (off.to_shwi (&off_hwi)) | |
4b228e61 | 585 | { |
588db50c | 586 | bit_offset = off_hwi; |
4f94d87c | 587 | exp = TREE_OPERAND (TREE_OPERAND (exp, 0), 0); |
4b228e61 RG |
588 | } |
589 | } | |
590 | } | |
591 | goto done; | |
592 | ||
6bec9271 RG |
593 | default: |
594 | goto done; | |
595 | } | |
596 | ||
597 | exp = TREE_OPERAND (exp, 0); | |
598 | } | |
6bec9271 | 599 | |
4f94d87c | 600 | done: |
588db50c | 601 | if (!bitsize.to_shwi (psize) || maybe_lt (*psize, 0)) |
ca8d9092 EB |
602 | { |
603 | *poffset = 0; | |
5b5d7f31 | 604 | *psize = -1; |
ca8d9092 EB |
605 | *pmax_size = -1; |
606 | ||
607 | return exp; | |
608 | } | |
609 | ||
588db50c RS |
610 | /* ??? Due to negative offsets in ARRAY_REF we can end up with |
611 | negative bit_offset here. We might want to store a zero offset | |
612 | in this case. */ | |
613 | if (!bit_offset.to_shwi (poffset)) | |
5b5d7f31 JJ |
614 | { |
615 | *poffset = 0; | |
616 | *pmax_size = -1; | |
617 | ||
618 | return exp; | |
619 | } | |
ca8d9092 | 620 | |
90ff582f | 621 | /* In case of a decl or constant base object we can do better. */ |
0230277c RG |
622 | |
623 | if (DECL_P (exp)) | |
624 | { | |
8813a647 | 625 | if (flag_unconstrained_commons && VAR_P (exp) && DECL_COMMON (exp)) |
71017a7b AL |
626 | { |
627 | tree sz_tree = TYPE_SIZE (TREE_TYPE (exp)); | |
628 | /* If size is unknown, or we have read to the end, assume there | |
629 | may be more to the structure than we are told. */ | |
630 | if (TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE | |
631 | || (seen_variable_array_ref | |
632 | && (sz_tree == NULL_TREE | |
588db50c RS |
633 | || !poly_int_tree_p (sz_tree) |
634 | || maybe_eq (bit_offset + maxsize, | |
635 | wi::to_poly_offset (sz_tree))))) | |
71017a7b AL |
636 | maxsize = -1; |
637 | } | |
0230277c RG |
638 | /* If maxsize is unknown adjust it according to the size of the |
639 | base decl. */ | |
588db50c RS |
640 | else if (!known_size_p (maxsize) |
641 | && DECL_SIZE (exp) | |
642 | && poly_int_tree_p (DECL_SIZE (exp))) | |
643 | maxsize = wi::to_poly_offset (DECL_SIZE (exp)) - bit_offset; | |
0230277c | 644 | } |
90ff582f RG |
645 | else if (CONSTANT_CLASS_P (exp)) |
646 | { | |
647 | /* If maxsize is unknown adjust it according to the size of the | |
648 | base type constant. */ | |
588db50c | 649 | if (!known_size_p (maxsize) |
5b5d7f31 | 650 | && TYPE_SIZE (TREE_TYPE (exp)) |
588db50c RS |
651 | && poly_int_tree_p (TYPE_SIZE (TREE_TYPE (exp)))) |
652 | maxsize = (wi::to_poly_offset (TYPE_SIZE (TREE_TYPE (exp))) | |
807e902e | 653 | - bit_offset); |
90ff582f | 654 | } |
00e85045 | 655 | |
588db50c RS |
656 | if (!maxsize.to_shwi (pmax_size) |
657 | || maybe_lt (*pmax_size, 0) | |
658 | || !endpoint_representable_p (*poffset, *pmax_size)) | |
5b5d7f31 | 659 | *pmax_size = -1; |
476dec78 JJ |
660 | |
661 | /* Punt if *POFFSET + *PSIZE overflows in HOST_WIDE_INT, the callers don't | |
662 | check for such overflows individually and assume it works. */ | |
588db50c | 663 | if (!endpoint_representable_p (*poffset, *psize)) |
476dec78 JJ |
664 | { |
665 | *poffset = 0; | |
666 | *psize = -1; | |
667 | *pmax_size = -1; | |
668 | ||
669 | return exp; | |
670 | } | |
6bec9271 RG |
671 | |
672 | return exp; | |
c75ab022 | 673 | } |
e9e0aa2c | 674 | |
588db50c RS |
675 | /* Like get_ref_base_and_extent, but for cases in which we only care |
676 | about constant-width accesses at constant offsets. Return null | |
677 | if the access is anything else. */ | |
678 | ||
679 | tree | |
680 | get_ref_base_and_extent_hwi (tree exp, HOST_WIDE_INT *poffset, | |
681 | HOST_WIDE_INT *psize, bool *preverse) | |
682 | { | |
683 | poly_int64 offset, size, max_size; | |
684 | HOST_WIDE_INT const_offset, const_size; | |
685 | bool reverse; | |
686 | tree decl = get_ref_base_and_extent (exp, &offset, &size, &max_size, | |
687 | &reverse); | |
688 | if (!offset.is_constant (&const_offset) | |
689 | || !size.is_constant (&const_size) | |
690 | || const_offset < 0 | |
691 | || !known_size_p (max_size) | |
692 | || maybe_ne (max_size, const_size)) | |
693 | return NULL_TREE; | |
694 | ||
695 | *poffset = const_offset; | |
696 | *psize = const_size; | |
697 | *preverse = reverse; | |
698 | return decl; | |
699 | } | |
700 | ||
f2918c18 AM |
701 | /* Returns the base object and a constant BITS_PER_UNIT offset in *POFFSET that |
702 | denotes the starting address of the memory access EXP. | |
703 | Returns NULL_TREE if the offset is not constant or any component | |
704 | is not BITS_PER_UNIT-aligned. | |
705 | VALUEIZE if non-NULL is used to valueize SSA names. It should return | |
706 | its argument or a constant if the argument is known to be constant. */ | |
707 | ||
708 | tree | |
709 | get_addr_base_and_unit_offset_1 (tree exp, HOST_WIDE_INT *poffset, | |
710 | tree (*valueize) (tree)) | |
711 | { | |
712 | HOST_WIDE_INT byte_offset = 0; | |
713 | ||
714 | /* Compute cumulative byte-offset for nested component-refs and array-refs, | |
715 | and find the ultimate containing object. */ | |
716 | while (1) | |
717 | { | |
718 | switch (TREE_CODE (exp)) | |
719 | { | |
720 | case BIT_FIELD_REF: | |
721 | { | |
722 | HOST_WIDE_INT this_off = TREE_INT_CST_LOW (TREE_OPERAND (exp, 2)); | |
723 | if (this_off % BITS_PER_UNIT) | |
724 | return NULL_TREE; | |
725 | byte_offset += this_off / BITS_PER_UNIT; | |
726 | } | |
727 | break; | |
728 | ||
729 | case COMPONENT_REF: | |
730 | { | |
731 | tree field = TREE_OPERAND (exp, 1); | |
732 | tree this_offset = component_ref_field_offset (exp); | |
733 | HOST_WIDE_INT hthis_offset; | |
734 | ||
735 | if (!this_offset | |
736 | || TREE_CODE (this_offset) != INTEGER_CST | |
737 | || (TREE_INT_CST_LOW (DECL_FIELD_BIT_OFFSET (field)) | |
738 | % BITS_PER_UNIT)) | |
739 | return NULL_TREE; | |
740 | ||
741 | hthis_offset = TREE_INT_CST_LOW (this_offset); | |
742 | hthis_offset += (TREE_INT_CST_LOW (DECL_FIELD_BIT_OFFSET (field)) | |
743 | / BITS_PER_UNIT); | |
744 | byte_offset += hthis_offset; | |
745 | } | |
746 | break; | |
747 | ||
748 | case ARRAY_REF: | |
749 | case ARRAY_RANGE_REF: | |
750 | { | |
751 | tree index = TREE_OPERAND (exp, 1); | |
752 | tree low_bound, unit_size; | |
753 | ||
754 | if (valueize | |
755 | && TREE_CODE (index) == SSA_NAME) | |
756 | index = (*valueize) (index); | |
757 | ||
758 | /* If the resulting bit-offset is constant, track it. */ | |
759 | if (TREE_CODE (index) == INTEGER_CST | |
760 | && (low_bound = array_ref_low_bound (exp), | |
761 | TREE_CODE (low_bound) == INTEGER_CST) | |
762 | && (unit_size = array_ref_element_size (exp), | |
763 | TREE_CODE (unit_size) == INTEGER_CST)) | |
764 | { | |
765 | offset_int woffset | |
766 | = wi::sext (wi::to_offset (index) - wi::to_offset (low_bound), | |
767 | TYPE_PRECISION (TREE_TYPE (index))); | |
768 | woffset *= wi::to_offset (unit_size); | |
769 | byte_offset += woffset.to_shwi (); | |
770 | } | |
771 | else | |
772 | return NULL_TREE; | |
773 | } | |
774 | break; | |
775 | ||
776 | case REALPART_EXPR: | |
777 | break; | |
778 | ||
779 | case IMAGPART_EXPR: | |
780 | byte_offset += TREE_INT_CST_LOW (TYPE_SIZE_UNIT (TREE_TYPE (exp))); | |
781 | break; | |
782 | ||
783 | case VIEW_CONVERT_EXPR: | |
784 | break; | |
785 | ||
786 | case MEM_REF: | |
787 | { | |
788 | tree base = TREE_OPERAND (exp, 0); | |
789 | if (valueize | |
790 | && TREE_CODE (base) == SSA_NAME) | |
791 | base = (*valueize) (base); | |
792 | ||
793 | /* Hand back the decl for MEM[&decl, off]. */ | |
794 | if (TREE_CODE (base) == ADDR_EXPR) | |
795 | { | |
796 | if (!integer_zerop (TREE_OPERAND (exp, 1))) | |
797 | { | |
798 | offset_int off = mem_ref_offset (exp); | |
799 | byte_offset += off.to_short_addr (); | |
800 | } | |
801 | exp = TREE_OPERAND (base, 0); | |
802 | } | |
803 | goto done; | |
804 | } | |
805 | ||
806 | case TARGET_MEM_REF: | |
807 | { | |
808 | tree base = TREE_OPERAND (exp, 0); | |
809 | if (valueize | |
810 | && TREE_CODE (base) == SSA_NAME) | |
811 | base = (*valueize) (base); | |
812 | ||
813 | /* Hand back the decl for MEM[&decl, off]. */ | |
814 | if (TREE_CODE (base) == ADDR_EXPR) | |
815 | { | |
816 | if (TMR_INDEX (exp) || TMR_INDEX2 (exp)) | |
817 | return NULL_TREE; | |
818 | if (!integer_zerop (TMR_OFFSET (exp))) | |
819 | { | |
820 | offset_int off = mem_ref_offset (exp); | |
821 | byte_offset += off.to_short_addr (); | |
822 | } | |
823 | exp = TREE_OPERAND (base, 0); | |
824 | } | |
825 | goto done; | |
826 | } | |
827 | ||
828 | default: | |
829 | goto done; | |
830 | } | |
831 | ||
832 | exp = TREE_OPERAND (exp, 0); | |
833 | } | |
834 | done: | |
835 | ||
836 | *poffset = byte_offset; | |
837 | return exp; | |
838 | } | |
839 | ||
70f34814 RG |
840 | /* Returns the base object and a constant BITS_PER_UNIT offset in *POFFSET that |
841 | denotes the starting address of the memory access EXP. | |
842 | Returns NULL_TREE if the offset is not constant or any component | |
843 | is not BITS_PER_UNIT-aligned. */ | |
844 | ||
845 | tree | |
846 | get_addr_base_and_unit_offset (tree exp, HOST_WIDE_INT *poffset) | |
847 | { | |
cfef45c8 | 848 | return get_addr_base_and_unit_offset_1 (exp, poffset, NULL); |
70f34814 RG |
849 | } |
850 | ||
2e58df6e RG |
851 | /* Returns true if STMT references an SSA_NAME that has |
852 | SSA_NAME_OCCURS_IN_ABNORMAL_PHI set, otherwise false. */ | |
853 | ||
854 | bool | |
355fe088 | 855 | stmt_references_abnormal_ssa_name (gimple *stmt) |
2e58df6e RG |
856 | { |
857 | ssa_op_iter oi; | |
858 | use_operand_p use_p; | |
859 | ||
860 | FOR_EACH_SSA_USE_OPERAND (use_p, stmt, oi, SSA_OP_USE) | |
861 | { | |
862 | if (SSA_NAME_OCCURS_IN_ABNORMAL_PHI (USE_FROM_PTR (use_p))) | |
863 | return true; | |
864 | } | |
865 | ||
866 | return false; | |
867 | } | |
7ee2468b | 868 | |
cf8be00d RS |
869 | /* If STMT takes any abnormal PHI values as input, replace them with |
870 | local copies. */ | |
871 | ||
872 | void | |
873 | replace_abnormal_ssa_names (gimple *stmt) | |
874 | { | |
875 | ssa_op_iter oi; | |
876 | use_operand_p use_p; | |
877 | ||
878 | FOR_EACH_SSA_USE_OPERAND (use_p, stmt, oi, SSA_OP_USE) | |
879 | { | |
880 | tree op = USE_FROM_PTR (use_p); | |
881 | if (TREE_CODE (op) == SSA_NAME && SSA_NAME_OCCURS_IN_ABNORMAL_PHI (op)) | |
882 | { | |
883 | gimple_stmt_iterator gsi = gsi_for_stmt (stmt); | |
884 | tree new_name = make_ssa_name (TREE_TYPE (op)); | |
885 | gassign *assign = gimple_build_assign (new_name, op); | |
886 | gsi_insert_before (&gsi, assign, GSI_SAME_STMT); | |
887 | SET_USE (use_p, new_name); | |
888 | } | |
889 | } | |
890 | } | |
891 | ||
7ee2468b | 892 | /* Pair of tree and a sorting index, for dump_enumerated_decls. */ |
a79683d5 | 893 | struct GTY(()) numbered_tree |
7ee2468b SB |
894 | { |
895 | tree t; | |
896 | int num; | |
897 | }; | |
7ee2468b | 898 | |
7ee2468b SB |
899 | |
900 | /* Compare two declarations references by their DECL_UID / sequence number. | |
901 | Called via qsort. */ | |
902 | ||
903 | static int | |
904 | compare_decls_by_uid (const void *pa, const void *pb) | |
905 | { | |
906 | const numbered_tree *nt_a = ((const numbered_tree *)pa); | |
907 | const numbered_tree *nt_b = ((const numbered_tree *)pb); | |
908 | ||
909 | if (DECL_UID (nt_a->t) != DECL_UID (nt_b->t)) | |
910 | return DECL_UID (nt_a->t) - DECL_UID (nt_b->t); | |
911 | return nt_a->num - nt_b->num; | |
912 | } | |
913 | ||
914 | /* Called via walk_gimple_stmt / walk_gimple_op by dump_enumerated_decls. */ | |
915 | static tree | |
916 | dump_enumerated_decls_push (tree *tp, int *walk_subtrees, void *data) | |
917 | { | |
918 | struct walk_stmt_info *wi = (struct walk_stmt_info *) data; | |
9771b263 | 919 | vec<numbered_tree> *list = (vec<numbered_tree> *) wi->info; |
7ee2468b SB |
920 | numbered_tree nt; |
921 | ||
922 | if (!DECL_P (*tp)) | |
923 | return NULL_TREE; | |
924 | nt.t = *tp; | |
9771b263 DN |
925 | nt.num = list->length (); |
926 | list->safe_push (nt); | |
7ee2468b SB |
927 | *walk_subtrees = 0; |
928 | return NULL_TREE; | |
929 | } | |
930 | ||
931 | /* Find all the declarations used by the current function, sort them by uid, | |
932 | and emit the sorted list. Each declaration is tagged with a sequence | |
933 | number indicating when it was found during statement / tree walking, | |
934 | so that TDF_NOUID comparisons of anonymous declarations are still | |
935 | meaningful. Where a declaration was encountered more than once, we | |
936 | emit only the sequence number of the first encounter. | |
937 | FILE is the dump file where to output the list and FLAGS is as in | |
938 | print_generic_expr. */ | |
939 | void | |
1a817418 | 940 | dump_enumerated_decls (FILE *file, dump_flags_t flags) |
7ee2468b SB |
941 | { |
942 | basic_block bb; | |
943 | struct walk_stmt_info wi; | |
00f96dc9 | 944 | auto_vec<numbered_tree, 40> decl_list; |
7ee2468b SB |
945 | |
946 | memset (&wi, '\0', sizeof (wi)); | |
9771b263 | 947 | wi.info = (void *) &decl_list; |
11cd3bed | 948 | FOR_EACH_BB_FN (bb, cfun) |
7ee2468b SB |
949 | { |
950 | gimple_stmt_iterator gsi; | |
951 | ||
952 | for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi)) | |
953 | if (!is_gimple_debug (gsi_stmt (gsi))) | |
954 | walk_gimple_stmt (&gsi, NULL, dump_enumerated_decls_push, &wi); | |
955 | } | |
9771b263 DN |
956 | decl_list.qsort (compare_decls_by_uid); |
957 | if (decl_list.length ()) | |
7ee2468b SB |
958 | { |
959 | unsigned ix; | |
960 | numbered_tree *ntp; | |
961 | tree last = NULL_TREE; | |
962 | ||
963 | fprintf (file, "Declarations used by %s, sorted by DECL_UID:\n", | |
964 | current_function_name ()); | |
9771b263 | 965 | FOR_EACH_VEC_ELT (decl_list, ix, ntp) |
7ee2468b SB |
966 | { |
967 | if (ntp->t == last) | |
968 | continue; | |
969 | fprintf (file, "%d: ", ntp->num); | |
970 | print_generic_decl (file, ntp->t, flags); | |
971 | fprintf (file, "\n"); | |
972 | last = ntp->t; | |
973 | } | |
974 | } | |
7ee2468b | 975 | } |