]>
Commit | Line | Data |
---|---|---|
910fdc79 | 1 | /* Tree based points-to analysis |
36dc1a88 | 2 | Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011 |
c75c517d | 3 | Free Software Foundation, Inc. |
910fdc79 DB |
4 | Contributed by Daniel Berlin <dberlin@dberlin.org> |
5 | ||
9dcd6f09 | 6 | This file is part of GCC. |
910fdc79 | 7 | |
9dcd6f09 NC |
8 | GCC is free software; you can redistribute it and/or modify |
9 | under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 3 of the License, or | |
11 | (at your option) any later version. | |
910fdc79 | 12 | |
9dcd6f09 NC |
13 | GCC is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
910fdc79 | 17 | |
9dcd6f09 NC |
18 | You should have received a copy of the GNU General Public License |
19 | along with GCC; see the file COPYING3. If not see | |
20 | <http://www.gnu.org/licenses/>. */ | |
910fdc79 DB |
21 | |
22 | #include "config.h" | |
23 | #include "system.h" | |
24 | #include "coretypes.h" | |
25 | #include "tm.h" | |
26 | #include "ggc.h" | |
27 | #include "obstack.h" | |
28 | #include "bitmap.h" | |
910fdc79 | 29 | #include "flags.h" |
910fdc79 | 30 | #include "basic-block.h" |
910fdc79 | 31 | #include "tree.h" |
910fdc79 DB |
32 | #include "tree-flow.h" |
33 | #include "tree-inline.h" | |
718f9c0f | 34 | #include "diagnostic-core.h" |
726a989a | 35 | #include "gimple.h" |
910fdc79 DB |
36 | #include "hashtab.h" |
37 | #include "function.h" | |
38 | #include "cgraph.h" | |
39 | #include "tree-pass.h" | |
910fdc79 DB |
40 | #include "alloc-pool.h" |
41 | #include "splay-tree.h" | |
a916f21d | 42 | #include "params.h" |
4ee00913 | 43 | #include "cgraph.h" |
c58936b6 | 44 | #include "alias.h" |
38635499 | 45 | #include "pointer-set.h" |
910fdc79 DB |
46 | |
47 | /* The idea behind this analyzer is to generate set constraints from the | |
48 | program, then solve the resulting constraints in order to generate the | |
c58936b6 | 49 | points-to sets. |
910fdc79 DB |
50 | |
51 | Set constraints are a way of modeling program analysis problems that | |
52 | involve sets. They consist of an inclusion constraint language, | |
53 | describing the variables (each variable is a set) and operations that | |
54 | are involved on the variables, and a set of rules that derive facts | |
55 | from these operations. To solve a system of set constraints, you derive | |
56 | all possible facts under the rules, which gives you the correct sets | |
57 | as a consequence. | |
58 | ||
59 | See "Efficient Field-sensitive pointer analysis for C" by "David | |
60 | J. Pearce and Paul H. J. Kelly and Chris Hankin, at | |
61 | http://citeseer.ist.psu.edu/pearce04efficient.html | |
62 | ||
63 | Also see "Ultra-fast Aliasing Analysis using CLA: A Million Lines | |
64 | of C Code in a Second" by ""Nevin Heintze and Olivier Tardieu" at | |
c58936b6 DB |
65 | http://citeseer.ist.psu.edu/heintze01ultrafast.html |
66 | ||
67 | There are three types of real constraint expressions, DEREF, | |
3e5937d7 | 68 | ADDRESSOF, and SCALAR. Each constraint expression consists |
c58936b6 | 69 | of a constraint type, a variable, and an offset. |
910fdc79 | 70 | |
910fdc79 DB |
71 | SCALAR is a constraint expression type used to represent x, whether |
72 | it appears on the LHS or the RHS of a statement. | |
73 | DEREF is a constraint expression type used to represent *x, whether | |
c58936b6 | 74 | it appears on the LHS or the RHS of a statement. |
910fdc79 | 75 | ADDRESSOF is a constraint expression used to represent &x, whether |
607fb860 | 76 | it appears on the LHS or the RHS of a statement. |
c58936b6 | 77 | |
910fdc79 DB |
78 | Each pointer variable in the program is assigned an integer id, and |
79 | each field of a structure variable is assigned an integer id as well. | |
c58936b6 | 80 | |
910fdc79 DB |
81 | Structure variables are linked to their list of fields through a "next |
82 | field" in each variable that points to the next field in offset | |
c58936b6 DB |
83 | order. |
84 | Each variable for a structure field has | |
910fdc79 DB |
85 | |
86 | 1. "size", that tells the size in bits of that field. | |
87 | 2. "fullsize, that tells the size in bits of the entire structure. | |
88 | 3. "offset", that tells the offset in bits from the beginning of the | |
89 | structure to this field. | |
90 | ||
c58936b6 | 91 | Thus, |
910fdc79 DB |
92 | struct f |
93 | { | |
94 | int a; | |
95 | int b; | |
96 | } foo; | |
97 | int *bar; | |
98 | ||
99 | looks like | |
100 | ||
101 | foo.a -> id 1, size 32, offset 0, fullsize 64, next foo.b | |
102 | foo.b -> id 2, size 32, offset 32, fullsize 64, next NULL | |
103 | bar -> id 3, size 32, offset 0, fullsize 32, next NULL | |
104 | ||
c58936b6 | 105 | |
910fdc79 DB |
106 | In order to solve the system of set constraints, the following is |
107 | done: | |
108 | ||
109 | 1. Each constraint variable x has a solution set associated with it, | |
110 | Sol(x). | |
c58936b6 | 111 | |
910fdc79 DB |
112 | 2. Constraints are separated into direct, copy, and complex. |
113 | Direct constraints are ADDRESSOF constraints that require no extra | |
114 | processing, such as P = &Q | |
115 | Copy constraints are those of the form P = Q. | |
2941f691 DB |
116 | Complex constraints are all the constraints involving dereferences |
117 | and offsets (including offsetted copies). | |
c58936b6 | 118 | |
910fdc79 | 119 | 3. All direct constraints of the form P = &Q are processed, such |
c58936b6 | 120 | that Q is added to Sol(P) |
910fdc79 DB |
121 | |
122 | 4. All complex constraints for a given constraint variable are stored in a | |
c58936b6 | 123 | linked list attached to that variable's node. |
910fdc79 DB |
124 | |
125 | 5. A directed graph is built out of the copy constraints. Each | |
c58936b6 | 126 | constraint variable is a node in the graph, and an edge from |
910fdc79 | 127 | Q to P is added for each copy constraint of the form P = Q |
c58936b6 | 128 | |
910fdc79 DB |
129 | 6. The graph is then walked, and solution sets are |
130 | propagated along the copy edges, such that an edge from Q to P | |
131 | causes Sol(P) <- Sol(P) union Sol(Q). | |
c58936b6 | 132 | |
910fdc79 | 133 | 7. As we visit each node, all complex constraints associated with |
607fb860 | 134 | that node are processed by adding appropriate copy edges to the graph, or the |
c58936b6 | 135 | appropriate variables to the solution set. |
910fdc79 DB |
136 | |
137 | 8. The process of walking the graph is iterated until no solution | |
138 | sets change. | |
139 | ||
140 | Prior to walking the graph in steps 6 and 7, We perform static | |
c58936b6 | 141 | cycle elimination on the constraint graph, as well |
910fdc79 | 142 | as off-line variable substitution. |
c58936b6 | 143 | |
910fdc79 DB |
144 | TODO: Adding offsets to pointer-to-structures can be handled (IE not punted |
145 | on and turned into anything), but isn't. You can just see what offset | |
146 | inside the pointed-to struct it's going to access. | |
c58936b6 | 147 | |
910fdc79 | 148 | TODO: Constant bounded arrays can be handled as if they were structs of the |
c58936b6 | 149 | same number of elements. |
910fdc79 DB |
150 | |
151 | TODO: Modeling heap and incoming pointers becomes much better if we | |
152 | add fields to them as we discover them, which we could do. | |
153 | ||
154 | TODO: We could handle unions, but to be honest, it's probably not | |
155 | worth the pain or slowdown. */ | |
156 | ||
25a6a873 RG |
157 | /* IPA-PTA optimizations possible. |
158 | ||
159 | When the indirect function called is ANYTHING we can add disambiguation | |
160 | based on the function signatures (or simply the parameter count which | |
161 | is the varinfo size). We also do not need to consider functions that | |
162 | do not have their address taken. | |
163 | ||
164 | The is_global_var bit which marks escape points is overly conservative | |
165 | in IPA mode. Split it to is_escape_point and is_global_var - only | |
166 | externally visible globals are escape points in IPA mode. This is | |
167 | also needed to fix the pt_solution_includes_global predicate | |
168 | (and thus ptr_deref_may_alias_global_p). | |
169 | ||
170 | The way we introduce DECL_PT_UID to avoid fixing up all points-to | |
171 | sets in the translation unit when we copy a DECL during inlining | |
172 | pessimizes precision. The advantage is that the DECL_PT_UID keeps | |
173 | compile-time and memory usage overhead low - the points-to sets | |
174 | do not grow or get unshared as they would during a fixup phase. | |
175 | An alternative solution is to delay IPA PTA until after all | |
176 | inlining transformations have been applied. | |
177 | ||
178 | The way we propagate clobber/use information isn't optimized. | |
179 | It should use a new complex constraint that properly filters | |
180 | out local variables of the callee (though that would make | |
181 | the sets invalid after inlining). OTOH we might as well | |
182 | admit defeat to WHOPR and simply do all the clobber/use analysis | |
183 | and propagation after PTA finished but before we threw away | |
184 | points-to information for memory variables. WHOPR and PTA | |
185 | do not play along well anyway - the whole constraint solving | |
186 | would need to be done in WPA phase and it will be very interesting | |
187 | to apply the results to local SSA names during LTRANS phase. | |
188 | ||
189 | We probably should compute a per-function unit-ESCAPE solution | |
190 | propagating it simply like the clobber / uses solutions. The | |
191 | solution can go alongside the non-IPA espaced solution and be | |
192 | used to query which vars escape the unit through a function. | |
193 | ||
194 | We never put function decls in points-to sets so we do not | |
195 | keep the set of called functions for indirect calls. | |
196 | ||
197 | And probably more. */ | |
21392f19 | 198 | |
910fdc79 | 199 | static bool use_field_sensitive = true; |
4ee00913 | 200 | static int in_ipa_mode = 0; |
3e5937d7 DB |
201 | |
202 | /* Used for predecessor bitmaps. */ | |
4ee00913 | 203 | static bitmap_obstack predbitmap_obstack; |
3e5937d7 DB |
204 | |
205 | /* Used for points-to sets. */ | |
206 | static bitmap_obstack pta_obstack; | |
207 | ||
208 | /* Used for oldsolution members of variables. */ | |
209 | static bitmap_obstack oldpta_obstack; | |
210 | ||
211 | /* Used for per-solver-iteration bitmaps. */ | |
4ee00913 DB |
212 | static bitmap_obstack iteration_obstack; |
213 | ||
910fdc79 | 214 | static unsigned int create_variable_info_for (tree, const char *); |
3e5937d7 DB |
215 | typedef struct constraint_graph *constraint_graph_t; |
216 | static void unify_nodes (constraint_graph_t, unsigned int, unsigned int, bool); | |
910fdc79 | 217 | |
5006671f RG |
218 | struct constraint; |
219 | typedef struct constraint *constraint_t; | |
220 | ||
910fdc79 | 221 | DEF_VEC_P(constraint_t); |
b5efa470 | 222 | DEF_VEC_ALLOC_P(constraint_t,heap); |
910fdc79 | 223 | |
4ee00913 DB |
224 | #define EXECUTE_IF_IN_NONNULL_BITMAP(a, b, c, d) \ |
225 | if (a) \ | |
226 | EXECUTE_IF_SET_IN_BITMAP (a, b, c, d) | |
227 | ||
910fdc79 DB |
228 | static struct constraint_stats |
229 | { | |
230 | unsigned int total_vars; | |
3e5937d7 | 231 | unsigned int nonpointer_vars; |
910fdc79 DB |
232 | unsigned int unified_vars_static; |
233 | unsigned int unified_vars_dynamic; | |
234 | unsigned int iterations; | |
4ee00913 | 235 | unsigned int num_edges; |
3e5937d7 DB |
236 | unsigned int num_implicit_edges; |
237 | unsigned int points_to_sets_created; | |
910fdc79 DB |
238 | } stats; |
239 | ||
240 | struct variable_info | |
241 | { | |
242 | /* ID of this variable */ | |
243 | unsigned int id; | |
244 | ||
910fdc79 DB |
245 | /* True if this is a variable created by the constraint analysis, such as |
246 | heap variables and constraints we had to break up. */ | |
74d27244 | 247 | unsigned int is_artificial_var : 1; |
c58936b6 | 248 | |
13c2c08b DB |
249 | /* True if this is a special variable whose solution set should not be |
250 | changed. */ | |
74d27244 | 251 | unsigned int is_special_var : 1; |
910fdc79 DB |
252 | |
253 | /* True for variables whose size is not known or variable. */ | |
74d27244 | 254 | unsigned int is_unknown_size_var : 1; |
910fdc79 | 255 | |
e5bae89b RG |
256 | /* True for (sub-)fields that represent a whole variable. */ |
257 | unsigned int is_full_var : 1; | |
258 | ||
e8ca4159 | 259 | /* True if this is a heap variable. */ |
74d27244 RG |
260 | unsigned int is_heap_var : 1; |
261 | ||
9e39dba6 RG |
262 | /* True if this field may contain pointers. */ |
263 | unsigned int may_have_pointers : 1; | |
264 | ||
18abb35e RG |
265 | /* True if this field has only restrict qualified pointers. */ |
266 | unsigned int only_restrict_pointers : 1; | |
267 | ||
0bbf2ffa RG |
268 | /* True if this represents a global variable. */ |
269 | unsigned int is_global_var : 1; | |
270 | ||
25a6a873 RG |
271 | /* True if this represents a IPA function info. */ |
272 | unsigned int is_fn_info : 1; | |
273 | ||
795a337a RG |
274 | /* A link to the variable for the next field in this structure. */ |
275 | struct variable_info *next; | |
276 | ||
277 | /* Offset of this variable, in bits, from the base variable */ | |
278 | unsigned HOST_WIDE_INT offset; | |
279 | ||
280 | /* Size of the variable, in bits. */ | |
281 | unsigned HOST_WIDE_INT size; | |
282 | ||
283 | /* Full size of the base variable, in bits. */ | |
284 | unsigned HOST_WIDE_INT fullsize; | |
285 | ||
286 | /* Name of this variable */ | |
287 | const char *name; | |
288 | ||
289 | /* Tree that this variable is associated with. */ | |
290 | tree decl; | |
291 | ||
910fdc79 DB |
292 | /* Points-to set for this variable. */ |
293 | bitmap solution; | |
294 | ||
3e5937d7 DB |
295 | /* Old points-to set for this variable. */ |
296 | bitmap oldsolution; | |
910fdc79 DB |
297 | }; |
298 | typedef struct variable_info *varinfo_t; | |
299 | ||
300 | static varinfo_t first_vi_for_offset (varinfo_t, unsigned HOST_WIDE_INT); | |
5006671f RG |
301 | static varinfo_t first_or_preceding_vi_for_offset (varinfo_t, |
302 | unsigned HOST_WIDE_INT); | |
0e1f4c6b | 303 | static varinfo_t lookup_vi_for_tree (tree); |
b4cf8c9d | 304 | static inline bool type_can_have_subvars (const_tree); |
910fdc79 DB |
305 | |
306 | /* Pool of variable info structures. */ | |
307 | static alloc_pool variable_info_pool; | |
308 | ||
309 | DEF_VEC_P(varinfo_t); | |
310 | ||
b5efa470 | 311 | DEF_VEC_ALLOC_P(varinfo_t, heap); |
910fdc79 | 312 | |
38635499 DN |
313 | /* Table of variable info structures for constraint variables. |
314 | Indexed directly by variable info id. */ | |
b5efa470 | 315 | static VEC(varinfo_t,heap) *varmap; |
13c2c08b DB |
316 | |
317 | /* Return the varmap element N */ | |
318 | ||
319 | static inline varinfo_t | |
03190594 | 320 | get_varinfo (unsigned int n) |
13c2c08b | 321 | { |
62e5bf5d | 322 | return VEC_index (varinfo_t, varmap, n); |
13c2c08b | 323 | } |
910fdc79 | 324 | |
b7091901 RG |
325 | /* Static IDs for the special variables. */ |
326 | enum { nothing_id = 0, anything_id = 1, readonly_id = 2, | |
3e8542ca RG |
327 | escaped_id = 3, nonlocal_id = 4, |
328 | storedanything_id = 5, integer_id = 6 }; | |
b7091901 | 329 | |
910fdc79 | 330 | /* Return a new variable info structure consisting for a variable |
0bbf2ffa RG |
331 | named NAME, and using constraint graph node NODE. Append it |
332 | to the vector of variable info structures. */ | |
910fdc79 DB |
333 | |
334 | static varinfo_t | |
0bbf2ffa | 335 | new_var_info (tree t, const char *name) |
910fdc79 | 336 | { |
0bbf2ffa | 337 | unsigned index = VEC_length (varinfo_t, varmap); |
c22940cd | 338 | varinfo_t ret = (varinfo_t) pool_alloc (variable_info_pool); |
910fdc79 | 339 | |
0bbf2ffa | 340 | ret->id = index; |
910fdc79 DB |
341 | ret->name = name; |
342 | ret->decl = t; | |
0bbf2ffa RG |
343 | /* Vars without decl are artificial and do not have sub-variables. */ |
344 | ret->is_artificial_var = (t == NULL_TREE); | |
13c2c08b | 345 | ret->is_special_var = false; |
910fdc79 | 346 | ret->is_unknown_size_var = false; |
02583d3c RG |
347 | ret->is_full_var = (t == NULL_TREE); |
348 | ret->is_heap_var = false; | |
9e39dba6 | 349 | ret->may_have_pointers = true; |
18abb35e | 350 | ret->only_restrict_pointers = false; |
74d27244 | 351 | ret->is_global_var = (t == NULL_TREE); |
25a6a873 | 352 | ret->is_fn_info = false; |
0bbf2ffa | 353 | if (t && DECL_P (t)) |
6c0c92e6 RG |
354 | ret->is_global_var = (is_global_var (t) |
355 | /* We have to treat even local register variables | |
356 | as escape points. */ | |
9a6c9288 RG |
357 | || (TREE_CODE (t) == VAR_DECL |
358 | && DECL_HARD_REGISTER (t))); | |
3e5937d7 | 359 | ret->solution = BITMAP_ALLOC (&pta_obstack); |
74d8fa44 | 360 | ret->oldsolution = NULL; |
910fdc79 | 361 | ret->next = NULL; |
0bbf2ffa | 362 | |
18abb35e RG |
363 | stats.total_vars++; |
364 | ||
0bbf2ffa RG |
365 | VEC_safe_push (varinfo_t, heap, varmap, ret); |
366 | ||
910fdc79 DB |
367 | return ret; |
368 | } | |
369 | ||
3e8542ca RG |
370 | |
371 | /* A map mapping call statements to per-stmt variables for uses | |
372 | and clobbers specific to the call. */ | |
373 | struct pointer_map_t *call_stmt_vars; | |
374 | ||
375 | /* Lookup or create the variable for the call statement CALL. */ | |
376 | ||
377 | static varinfo_t | |
378 | get_call_vi (gimple call) | |
379 | { | |
380 | void **slot_p; | |
381 | varinfo_t vi, vi2; | |
382 | ||
383 | slot_p = pointer_map_insert (call_stmt_vars, call); | |
384 | if (*slot_p) | |
385 | return (varinfo_t) *slot_p; | |
386 | ||
387 | vi = new_var_info (NULL_TREE, "CALLUSED"); | |
388 | vi->offset = 0; | |
389 | vi->size = 1; | |
390 | vi->fullsize = 2; | |
391 | vi->is_full_var = true; | |
392 | ||
393 | vi->next = vi2 = new_var_info (NULL_TREE, "CALLCLOBBERED"); | |
394 | vi2->offset = 1; | |
395 | vi2->size = 1; | |
396 | vi2->fullsize = 2; | |
397 | vi2->is_full_var = true; | |
398 | ||
399 | *slot_p = (void *) vi; | |
400 | return vi; | |
401 | } | |
402 | ||
403 | /* Lookup the variable for the call statement CALL representing | |
404 | the uses. Returns NULL if there is nothing special about this call. */ | |
405 | ||
406 | static varinfo_t | |
407 | lookup_call_use_vi (gimple call) | |
408 | { | |
409 | void **slot_p; | |
410 | ||
411 | slot_p = pointer_map_contains (call_stmt_vars, call); | |
412 | if (slot_p) | |
413 | return (varinfo_t) *slot_p; | |
414 | ||
415 | return NULL; | |
416 | } | |
417 | ||
418 | /* Lookup the variable for the call statement CALL representing | |
419 | the clobbers. Returns NULL if there is nothing special about this call. */ | |
420 | ||
421 | static varinfo_t | |
422 | lookup_call_clobber_vi (gimple call) | |
423 | { | |
424 | varinfo_t uses = lookup_call_use_vi (call); | |
425 | if (!uses) | |
426 | return NULL; | |
427 | ||
428 | return uses->next; | |
429 | } | |
430 | ||
431 | /* Lookup or create the variable for the call statement CALL representing | |
432 | the uses. */ | |
433 | ||
434 | static varinfo_t | |
435 | get_call_use_vi (gimple call) | |
436 | { | |
437 | return get_call_vi (call); | |
438 | } | |
439 | ||
440 | /* Lookup or create the variable for the call statement CALL representing | |
441 | the clobbers. */ | |
442 | ||
443 | static varinfo_t ATTRIBUTE_UNUSED | |
444 | get_call_clobber_vi (gimple call) | |
445 | { | |
446 | return get_call_vi (call)->next; | |
447 | } | |
448 | ||
449 | ||
3e5937d7 | 450 | typedef enum {SCALAR, DEREF, ADDRESSOF} constraint_expr_type; |
910fdc79 DB |
451 | |
452 | /* An expression that appears in a constraint. */ | |
453 | ||
c58936b6 | 454 | struct constraint_expr |
910fdc79 DB |
455 | { |
456 | /* Constraint type. */ | |
457 | constraint_expr_type type; | |
458 | ||
459 | /* Variable we are referring to in the constraint. */ | |
460 | unsigned int var; | |
461 | ||
462 | /* Offset, in bits, of this constraint from the beginning of | |
463 | variables it ends up referring to. | |
464 | ||
465 | IOW, in a deref constraint, we would deref, get the result set, | |
466 | then add OFFSET to each member. */ | |
5006671f | 467 | HOST_WIDE_INT offset; |
910fdc79 DB |
468 | }; |
469 | ||
5006671f RG |
470 | /* Use 0x8000... as special unknown offset. */ |
471 | #define UNKNOWN_OFFSET ((HOST_WIDE_INT)-1 << (HOST_BITS_PER_WIDE_INT-1)) | |
472 | ||
4ee00913 DB |
473 | typedef struct constraint_expr ce_s; |
474 | DEF_VEC_O(ce_s); | |
475 | DEF_VEC_ALLOC_O(ce_s, heap); | |
ed6c4831 | 476 | static void get_constraint_for_1 (tree, VEC(ce_s, heap) **, bool, bool); |
1d85354c | 477 | static void get_constraint_for (tree, VEC(ce_s, heap) **); |
ed6c4831 | 478 | static void get_constraint_for_rhs (tree, VEC(ce_s, heap) **); |
4ee00913 | 479 | static void do_deref (VEC (ce_s, heap) **); |
910fdc79 DB |
480 | |
481 | /* Our set constraints are made up of two constraint expressions, one | |
c58936b6 | 482 | LHS, and one RHS. |
910fdc79 DB |
483 | |
484 | As described in the introduction, our set constraints each represent an | |
485 | operation between set valued variables. | |
486 | */ | |
487 | struct constraint | |
488 | { | |
489 | struct constraint_expr lhs; | |
490 | struct constraint_expr rhs; | |
491 | }; | |
492 | ||
493 | /* List of constraints that we use to build the constraint graph from. */ | |
494 | ||
b5efa470 | 495 | static VEC(constraint_t,heap) *constraints; |
910fdc79 DB |
496 | static alloc_pool constraint_pool; |
497 | ||
57250223 DB |
498 | /* The constraint graph is represented as an array of bitmaps |
499 | containing successor nodes. */ | |
910fdc79 DB |
500 | |
501 | struct constraint_graph | |
502 | { | |
3e5937d7 DB |
503 | /* Size of this graph, which may be different than the number of |
504 | nodes in the variable map. */ | |
505 | unsigned int size; | |
506 | ||
507 | /* Explicit successors of each node. */ | |
57250223 | 508 | bitmap *succs; |
3e5937d7 DB |
509 | |
510 | /* Implicit predecessors of each node (Used for variable | |
511 | substitution). */ | |
512 | bitmap *implicit_preds; | |
513 | ||
514 | /* Explicit predecessors of each node (Used for variable substitution). */ | |
57250223 | 515 | bitmap *preds; |
910fdc79 | 516 | |
3e5937d7 DB |
517 | /* Indirect cycle representatives, or -1 if the node has no indirect |
518 | cycles. */ | |
519 | int *indirect_cycles; | |
520 | ||
521 | /* Representative node for a node. rep[a] == a unless the node has | |
522 | been unified. */ | |
523 | unsigned int *rep; | |
524 | ||
7b765bed | 525 | /* Equivalence class representative for a label. This is used for |
3e5937d7 DB |
526 | variable substitution. */ |
527 | int *eq_rep; | |
528 | ||
aa46c8a3 DB |
529 | /* Pointer equivalence label for a node. All nodes with the same |
530 | pointer equivalence label can be unified together at some point | |
531 | (either during constraint optimization or after the constraint | |
532 | graph is built). */ | |
7b765bed DB |
533 | unsigned int *pe; |
534 | ||
535 | /* Pointer equivalence representative for a label. This is used to | |
536 | handle nodes that are pointer equivalent but not location | |
537 | equivalent. We can unite these once the addressof constraints | |
538 | are transformed into initial points-to sets. */ | |
539 | int *pe_rep; | |
540 | ||
541 | /* Pointer equivalence label for each node, used during variable | |
542 | substitution. */ | |
543 | unsigned int *pointer_label; | |
544 | ||
545 | /* Location equivalence label for each node, used during location | |
546 | equivalence finding. */ | |
547 | unsigned int *loc_label; | |
548 | ||
549 | /* Pointed-by set for each node, used during location equivalence | |
550 | finding. This is pointed-by rather than pointed-to, because it | |
551 | is constructed using the predecessor graph. */ | |
552 | bitmap *pointed_by; | |
553 | ||
554 | /* Points to sets for pointer equivalence. This is *not* the actual | |
555 | points-to sets for nodes. */ | |
556 | bitmap *points_to; | |
3e5937d7 DB |
557 | |
558 | /* Bitmap of nodes where the bit is set if the node is a direct | |
559 | node. Used for variable substitution. */ | |
560 | sbitmap direct_nodes; | |
561 | ||
7b765bed DB |
562 | /* Bitmap of nodes where the bit is set if the node is address |
563 | taken. Used for variable substitution. */ | |
564 | bitmap address_taken; | |
565 | ||
3e5937d7 DB |
566 | /* Vector of complex constraints for each graph node. Complex |
567 | constraints are those involving dereferences or offsets that are | |
568 | not 0. */ | |
569 | VEC(constraint_t,heap) **complex; | |
570 | }; | |
910fdc79 DB |
571 | |
572 | static constraint_graph_t graph; | |
573 | ||
3e5937d7 DB |
574 | /* During variable substitution and the offline version of indirect |
575 | cycle finding, we create nodes to represent dereferences and | |
576 | address taken constraints. These represent where these start and | |
577 | end. */ | |
578 | #define FIRST_REF_NODE (VEC_length (varinfo_t, varmap)) | |
579 | #define LAST_REF_NODE (FIRST_REF_NODE + (FIRST_REF_NODE - 1)) | |
3e5937d7 DB |
580 | |
581 | /* Return the representative node for NODE, if NODE has been unioned | |
582 | with another NODE. | |
583 | This function performs path compression along the way to finding | |
584 | the representative. */ | |
585 | ||
586 | static unsigned int | |
587 | find (unsigned int node) | |
588 | { | |
589 | gcc_assert (node < graph->size); | |
590 | if (graph->rep[node] != node) | |
591 | return graph->rep[node] = find (graph->rep[node]); | |
592 | return node; | |
593 | } | |
594 | ||
595 | /* Union the TO and FROM nodes to the TO nodes. | |
596 | Note that at some point in the future, we may want to do | |
597 | union-by-rank, in which case we are going to have to return the | |
598 | node we unified to. */ | |
599 | ||
600 | static bool | |
601 | unite (unsigned int to, unsigned int from) | |
602 | { | |
603 | gcc_assert (to < graph->size && from < graph->size); | |
604 | if (to != from && graph->rep[from] != to) | |
605 | { | |
606 | graph->rep[from] = to; | |
607 | return true; | |
608 | } | |
609 | return false; | |
610 | } | |
611 | ||
910fdc79 DB |
612 | /* Create a new constraint consisting of LHS and RHS expressions. */ |
613 | ||
c58936b6 | 614 | static constraint_t |
910fdc79 DB |
615 | new_constraint (const struct constraint_expr lhs, |
616 | const struct constraint_expr rhs) | |
617 | { | |
c22940cd | 618 | constraint_t ret = (constraint_t) pool_alloc (constraint_pool); |
910fdc79 DB |
619 | ret->lhs = lhs; |
620 | ret->rhs = rhs; | |
621 | return ret; | |
622 | } | |
623 | ||
624 | /* Print out constraint C to FILE. */ | |
625 | ||
5006671f | 626 | static void |
910fdc79 DB |
627 | dump_constraint (FILE *file, constraint_t c) |
628 | { | |
629 | if (c->lhs.type == ADDRESSOF) | |
630 | fprintf (file, "&"); | |
631 | else if (c->lhs.type == DEREF) | |
c58936b6 | 632 | fprintf (file, "*"); |
5006671f RG |
633 | fprintf (file, "%s", get_varinfo (c->lhs.var)->name); |
634 | if (c->lhs.offset == UNKNOWN_OFFSET) | |
635 | fprintf (file, " + UNKNOWN"); | |
636 | else if (c->lhs.offset != 0) | |
910fdc79 DB |
637 | fprintf (file, " + " HOST_WIDE_INT_PRINT_DEC, c->lhs.offset); |
638 | fprintf (file, " = "); | |
639 | if (c->rhs.type == ADDRESSOF) | |
640 | fprintf (file, "&"); | |
641 | else if (c->rhs.type == DEREF) | |
642 | fprintf (file, "*"); | |
5006671f RG |
643 | fprintf (file, "%s", get_varinfo (c->rhs.var)->name); |
644 | if (c->rhs.offset == UNKNOWN_OFFSET) | |
645 | fprintf (file, " + UNKNOWN"); | |
646 | else if (c->rhs.offset != 0) | |
910fdc79 | 647 | fprintf (file, " + " HOST_WIDE_INT_PRINT_DEC, c->rhs.offset); |
910fdc79 DB |
648 | } |
649 | ||
5006671f RG |
650 | |
651 | void debug_constraint (constraint_t); | |
652 | void debug_constraints (void); | |
653 | void debug_constraint_graph (void); | |
654 | void debug_solution_for_var (unsigned int); | |
655 | void debug_sa_points_to_info (void); | |
656 | ||
910fdc79 DB |
657 | /* Print out constraint C to stderr. */ |
658 | ||
24e47c76 | 659 | DEBUG_FUNCTION void |
910fdc79 DB |
660 | debug_constraint (constraint_t c) |
661 | { | |
662 | dump_constraint (stderr, c); | |
8576f20a | 663 | fprintf (stderr, "\n"); |
910fdc79 DB |
664 | } |
665 | ||
666 | /* Print out all constraints to FILE */ | |
667 | ||
5006671f | 668 | static void |
25a6a873 | 669 | dump_constraints (FILE *file, int from) |
910fdc79 DB |
670 | { |
671 | int i; | |
672 | constraint_t c; | |
25a6a873 | 673 | for (i = from; VEC_iterate (constraint_t, constraints, i, c); i++) |
8576f20a RG |
674 | if (c) |
675 | { | |
676 | dump_constraint (file, c); | |
677 | fprintf (file, "\n"); | |
678 | } | |
910fdc79 DB |
679 | } |
680 | ||
681 | /* Print out all constraints to stderr. */ | |
682 | ||
24e47c76 | 683 | DEBUG_FUNCTION void |
910fdc79 DB |
684 | debug_constraints (void) |
685 | { | |
25a6a873 | 686 | dump_constraints (stderr, 0); |
910fdc79 DB |
687 | } |
688 | ||
fc93bcb6 FP |
689 | /* Print the constraint graph in dot format. */ |
690 | ||
5006671f | 691 | static void |
fc93bcb6 FP |
692 | dump_constraint_graph (FILE *file) |
693 | { | |
8576f20a | 694 | unsigned int i; |
fc93bcb6 FP |
695 | |
696 | /* Only print the graph if it has already been initialized: */ | |
697 | if (!graph) | |
698 | return; | |
699 | ||
fc93bcb6 | 700 | /* Prints the header of the dot file: */ |
fc93bcb6 FP |
701 | fprintf (file, "strict digraph {\n"); |
702 | fprintf (file, " node [\n shape = box\n ]\n"); | |
703 | fprintf (file, " edge [\n fontsize = \"12\"\n ]\n"); | |
8576f20a RG |
704 | fprintf (file, "\n // List of nodes and complex constraints in " |
705 | "the constraint graph:\n"); | |
706 | ||
707 | /* The next lines print the nodes in the graph together with the | |
708 | complex constraints attached to them. */ | |
709 | for (i = 0; i < graph->size; i++) | |
fc93bcb6 | 710 | { |
8576f20a RG |
711 | if (find (i) != i) |
712 | continue; | |
713 | if (i < FIRST_REF_NODE) | |
714 | fprintf (file, "\"%s\"", get_varinfo (i)->name); | |
715 | else | |
716 | fprintf (file, "\"*%s\"", get_varinfo (i - FIRST_REF_NODE)->name); | |
717 | if (graph->complex[i]) | |
718 | { | |
719 | unsigned j; | |
720 | constraint_t c; | |
721 | fprintf (file, " [label=\"\\N\\n"); | |
722 | for (j = 0; VEC_iterate (constraint_t, graph->complex[i], j, c); ++j) | |
723 | { | |
724 | dump_constraint (file, c); | |
725 | fprintf (file, "\\l"); | |
726 | } | |
727 | fprintf (file, "\"]"); | |
728 | } | |
729 | fprintf (file, ";\n"); | |
fc93bcb6 FP |
730 | } |
731 | ||
8576f20a RG |
732 | /* Go over the edges. */ |
733 | fprintf (file, "\n // Edges in the constraint graph:\n"); | |
734 | for (i = 0; i < graph->size; i++) | |
735 | { | |
736 | unsigned j; | |
737 | bitmap_iterator bi; | |
738 | if (find (i) != i) | |
739 | continue; | |
740 | EXECUTE_IF_IN_NONNULL_BITMAP (graph->succs[i], 0, j, bi) | |
741 | { | |
742 | unsigned to = find (j); | |
743 | if (i == to) | |
744 | continue; | |
745 | if (i < FIRST_REF_NODE) | |
746 | fprintf (file, "\"%s\"", get_varinfo (i)->name); | |
747 | else | |
748 | fprintf (file, "\"*%s\"", get_varinfo (i - FIRST_REF_NODE)->name); | |
749 | fprintf (file, " -> "); | |
750 | if (to < FIRST_REF_NODE) | |
751 | fprintf (file, "\"%s\"", get_varinfo (to)->name); | |
752 | else | |
753 | fprintf (file, "\"*%s\"", get_varinfo (to - FIRST_REF_NODE)->name); | |
754 | fprintf (file, ";\n"); | |
755 | } | |
756 | } | |
fc93bcb6 | 757 | |
8576f20a RG |
758 | /* Prints the tail of the dot file. */ |
759 | fprintf (file, "}\n"); | |
fc93bcb6 FP |
760 | } |
761 | ||
762 | /* Print out the constraint graph to stderr. */ | |
763 | ||
24e47c76 | 764 | DEBUG_FUNCTION void |
fc93bcb6 FP |
765 | debug_constraint_graph (void) |
766 | { | |
767 | dump_constraint_graph (stderr); | |
768 | } | |
769 | ||
c58936b6 | 770 | /* SOLVER FUNCTIONS |
910fdc79 DB |
771 | |
772 | The solver is a simple worklist solver, that works on the following | |
773 | algorithm: | |
c58936b6 | 774 | |
3e5937d7 DB |
775 | sbitmap changed_nodes = all zeroes; |
776 | changed_count = 0; | |
777 | For each node that is not already collapsed: | |
778 | changed_count++; | |
779 | set bit in changed nodes | |
910fdc79 | 780 | |
910fdc79 DB |
781 | while (changed_count > 0) |
782 | { | |
783 | compute topological ordering for constraint graph | |
c58936b6 | 784 | |
910fdc79 DB |
785 | find and collapse cycles in the constraint graph (updating |
786 | changed if necessary) | |
c58936b6 | 787 | |
910fdc79 DB |
788 | for each node (n) in the graph in topological order: |
789 | changed_count--; | |
790 | ||
791 | Process each complex constraint associated with the node, | |
792 | updating changed if necessary. | |
793 | ||
794 | For each outgoing edge from n, propagate the solution from n to | |
795 | the destination of the edge, updating changed as necessary. | |
796 | ||
797 | } */ | |
798 | ||
799 | /* Return true if two constraint expressions A and B are equal. */ | |
800 | ||
801 | static bool | |
802 | constraint_expr_equal (struct constraint_expr a, struct constraint_expr b) | |
803 | { | |
4ee00913 | 804 | return a.type == b.type && a.var == b.var && a.offset == b.offset; |
910fdc79 DB |
805 | } |
806 | ||
807 | /* Return true if constraint expression A is less than constraint expression | |
808 | B. This is just arbitrary, but consistent, in order to give them an | |
809 | ordering. */ | |
810 | ||
811 | static bool | |
812 | constraint_expr_less (struct constraint_expr a, struct constraint_expr b) | |
813 | { | |
814 | if (a.type == b.type) | |
815 | { | |
816 | if (a.var == b.var) | |
817 | return a.offset < b.offset; | |
818 | else | |
819 | return a.var < b.var; | |
820 | } | |
821 | else | |
822 | return a.type < b.type; | |
823 | } | |
824 | ||
825 | /* Return true if constraint A is less than constraint B. This is just | |
826 | arbitrary, but consistent, in order to give them an ordering. */ | |
827 | ||
828 | static bool | |
829 | constraint_less (const constraint_t a, const constraint_t b) | |
830 | { | |
831 | if (constraint_expr_less (a->lhs, b->lhs)) | |
832 | return true; | |
833 | else if (constraint_expr_less (b->lhs, a->lhs)) | |
834 | return false; | |
835 | else | |
836 | return constraint_expr_less (a->rhs, b->rhs); | |
837 | } | |
838 | ||
839 | /* Return true if two constraints A and B are equal. */ | |
c58936b6 | 840 | |
910fdc79 DB |
841 | static bool |
842 | constraint_equal (struct constraint a, struct constraint b) | |
843 | { | |
c58936b6 | 844 | return constraint_expr_equal (a.lhs, b.lhs) |
910fdc79 DB |
845 | && constraint_expr_equal (a.rhs, b.rhs); |
846 | } | |
847 | ||
848 | ||
849 | /* Find a constraint LOOKFOR in the sorted constraint vector VEC */ | |
850 | ||
851 | static constraint_t | |
b5efa470 | 852 | constraint_vec_find (VEC(constraint_t,heap) *vec, |
910fdc79 DB |
853 | struct constraint lookfor) |
854 | { | |
c58936b6 | 855 | unsigned int place; |
910fdc79 DB |
856 | constraint_t found; |
857 | ||
858 | if (vec == NULL) | |
859 | return NULL; | |
860 | ||
861 | place = VEC_lower_bound (constraint_t, vec, &lookfor, constraint_less); | |
862 | if (place >= VEC_length (constraint_t, vec)) | |
863 | return NULL; | |
864 | found = VEC_index (constraint_t, vec, place); | |
865 | if (!constraint_equal (*found, lookfor)) | |
866 | return NULL; | |
867 | return found; | |
868 | } | |
869 | ||
870 | /* Union two constraint vectors, TO and FROM. Put the result in TO. */ | |
871 | ||
872 | static void | |
b5efa470 DB |
873 | constraint_set_union (VEC(constraint_t,heap) **to, |
874 | VEC(constraint_t,heap) **from) | |
910fdc79 DB |
875 | { |
876 | int i; | |
877 | constraint_t c; | |
878 | ||
ac47786e | 879 | FOR_EACH_VEC_ELT (constraint_t, *from, i, c) |
910fdc79 DB |
880 | { |
881 | if (constraint_vec_find (*to, *c) == NULL) | |
882 | { | |
883 | unsigned int place = VEC_lower_bound (constraint_t, *to, c, | |
884 | constraint_less); | |
b5efa470 | 885 | VEC_safe_insert (constraint_t, heap, *to, place, c); |
910fdc79 DB |
886 | } |
887 | } | |
888 | } | |
889 | ||
5006671f RG |
890 | /* Expands the solution in SET to all sub-fields of variables included. |
891 | Union the expanded result into RESULT. */ | |
892 | ||
893 | static void | |
894 | solution_set_expand (bitmap result, bitmap set) | |
895 | { | |
896 | bitmap_iterator bi; | |
897 | bitmap vars = NULL; | |
898 | unsigned j; | |
899 | ||
900 | /* In a first pass record all variables we need to add all | |
901 | sub-fields off. This avoids quadratic behavior. */ | |
902 | EXECUTE_IF_SET_IN_BITMAP (set, 0, j, bi) | |
903 | { | |
904 | varinfo_t v = get_varinfo (j); | |
905 | if (v->is_artificial_var | |
906 | || v->is_full_var) | |
907 | continue; | |
908 | v = lookup_vi_for_tree (v->decl); | |
909 | if (vars == NULL) | |
910 | vars = BITMAP_ALLOC (NULL); | |
911 | bitmap_set_bit (vars, v->id); | |
912 | } | |
913 | ||
914 | /* In the second pass now do the addition to the solution and | |
915 | to speed up solving add it to the delta as well. */ | |
916 | if (vars != NULL) | |
917 | { | |
918 | EXECUTE_IF_SET_IN_BITMAP (vars, 0, j, bi) | |
919 | { | |
920 | varinfo_t v = get_varinfo (j); | |
921 | for (; v != NULL; v = v->next) | |
922 | bitmap_set_bit (result, v->id); | |
923 | } | |
924 | BITMAP_FREE (vars); | |
925 | } | |
926 | } | |
927 | ||
910fdc79 DB |
928 | /* Take a solution set SET, add OFFSET to each member of the set, and |
929 | overwrite SET with the result when done. */ | |
930 | ||
931 | static void | |
5006671f | 932 | solution_set_add (bitmap set, HOST_WIDE_INT offset) |
910fdc79 DB |
933 | { |
934 | bitmap result = BITMAP_ALLOC (&iteration_obstack); | |
935 | unsigned int i; | |
936 | bitmap_iterator bi; | |
937 | ||
5006671f RG |
938 | /* If the offset is unknown we have to expand the solution to |
939 | all subfields. */ | |
940 | if (offset == UNKNOWN_OFFSET) | |
941 | { | |
942 | solution_set_expand (set, set); | |
943 | return; | |
944 | } | |
945 | ||
910fdc79 DB |
946 | EXECUTE_IF_SET_IN_BITMAP (set, 0, i, bi) |
947 | { | |
e5bae89b | 948 | varinfo_t vi = get_varinfo (i); |
c58936b6 | 949 | |
e5bae89b RG |
950 | /* If this is a variable with just one field just set its bit |
951 | in the result. */ | |
952 | if (vi->is_artificial_var | |
953 | || vi->is_unknown_size_var | |
954 | || vi->is_full_var) | |
955 | bitmap_set_bit (result, i); | |
956 | else | |
910fdc79 | 957 | { |
e5bae89b | 958 | unsigned HOST_WIDE_INT fieldoffset = vi->offset + offset; |
5006671f RG |
959 | |
960 | /* If the offset makes the pointer point to before the | |
961 | variable use offset zero for the field lookup. */ | |
962 | if (offset < 0 | |
963 | && fieldoffset > vi->offset) | |
964 | fieldoffset = 0; | |
965 | ||
966 | if (offset != 0) | |
967 | vi = first_or_preceding_vi_for_offset (vi, fieldoffset); | |
968 | ||
969 | bitmap_set_bit (result, vi->id); | |
e5bae89b RG |
970 | /* If the result is not exactly at fieldoffset include the next |
971 | field as well. See get_constraint_for_ptr_offset for more | |
972 | rationale. */ | |
5006671f RG |
973 | if (vi->offset != fieldoffset |
974 | && vi->next != NULL) | |
975 | bitmap_set_bit (result, vi->next->id); | |
910fdc79 DB |
976 | } |
977 | } | |
c58936b6 DB |
978 | |
979 | bitmap_copy (set, result); | |
910fdc79 DB |
980 | BITMAP_FREE (result); |
981 | } | |
982 | ||
983 | /* Union solution sets TO and FROM, and add INC to each member of FROM in the | |
984 | process. */ | |
985 | ||
986 | static bool | |
5006671f | 987 | set_union_with_increment (bitmap to, bitmap from, HOST_WIDE_INT inc) |
910fdc79 DB |
988 | { |
989 | if (inc == 0) | |
990 | return bitmap_ior_into (to, from); | |
991 | else | |
992 | { | |
993 | bitmap tmp; | |
994 | bool res; | |
995 | ||
996 | tmp = BITMAP_ALLOC (&iteration_obstack); | |
997 | bitmap_copy (tmp, from); | |
998 | solution_set_add (tmp, inc); | |
999 | res = bitmap_ior_into (to, tmp); | |
1000 | BITMAP_FREE (tmp); | |
1001 | return res; | |
1002 | } | |
1003 | } | |
1004 | ||
3e5937d7 DB |
1005 | /* Insert constraint C into the list of complex constraints for graph |
1006 | node VAR. */ | |
910fdc79 DB |
1007 | |
1008 | static void | |
3e5937d7 DB |
1009 | insert_into_complex (constraint_graph_t graph, |
1010 | unsigned int var, constraint_t c) | |
910fdc79 | 1011 | { |
3e5937d7 DB |
1012 | VEC (constraint_t, heap) *complex = graph->complex[var]; |
1013 | unsigned int place = VEC_lower_bound (constraint_t, complex, c, | |
910fdc79 | 1014 | constraint_less); |
3e5937d7 DB |
1015 | |
1016 | /* Only insert constraints that do not already exist. */ | |
1017 | if (place >= VEC_length (constraint_t, complex) | |
1018 | || !constraint_equal (*c, *VEC_index (constraint_t, complex, place))) | |
1019 | VEC_safe_insert (constraint_t, heap, graph->complex[var], place, c); | |
910fdc79 DB |
1020 | } |
1021 | ||
1022 | ||
910fdc79 DB |
1023 | /* Condense two variable nodes into a single variable node, by moving |
1024 | all associated info from SRC to TO. */ | |
1025 | ||
c58936b6 | 1026 | static void |
3e5937d7 DB |
1027 | merge_node_constraints (constraint_graph_t graph, unsigned int to, |
1028 | unsigned int from) | |
910fdc79 | 1029 | { |
910fdc79 DB |
1030 | unsigned int i; |
1031 | constraint_t c; | |
c58936b6 | 1032 | |
3e5937d7 | 1033 | gcc_assert (find (from) == to); |
c58936b6 | 1034 | |
910fdc79 | 1035 | /* Move all complex constraints from src node into to node */ |
ac47786e | 1036 | FOR_EACH_VEC_ELT (constraint_t, graph->complex[from], i, c) |
910fdc79 DB |
1037 | { |
1038 | /* In complex constraints for node src, we may have either | |
3e5937d7 DB |
1039 | a = *src, and *src = a, or an offseted constraint which are |
1040 | always added to the rhs node's constraints. */ | |
c58936b6 | 1041 | |
910fdc79 DB |
1042 | if (c->rhs.type == DEREF) |
1043 | c->rhs.var = to; | |
3e5937d7 | 1044 | else if (c->lhs.type == DEREF) |
910fdc79 | 1045 | c->lhs.var = to; |
3e5937d7 DB |
1046 | else |
1047 | c->rhs.var = to; | |
910fdc79 | 1048 | } |
3e5937d7 DB |
1049 | constraint_set_union (&graph->complex[to], &graph->complex[from]); |
1050 | VEC_free (constraint_t, heap, graph->complex[from]); | |
1051 | graph->complex[from] = NULL; | |
910fdc79 DB |
1052 | } |
1053 | ||
910fdc79 DB |
1054 | |
1055 | /* Remove edges involving NODE from GRAPH. */ | |
1056 | ||
1057 | static void | |
1058 | clear_edges_for_node (constraint_graph_t graph, unsigned int node) | |
1059 | { | |
57250223 | 1060 | if (graph->succs[node]) |
3e5937d7 | 1061 | BITMAP_FREE (graph->succs[node]); |
f71ef09d DB |
1062 | } |
1063 | ||
910fdc79 DB |
1064 | /* Merge GRAPH nodes FROM and TO into node TO. */ |
1065 | ||
1066 | static void | |
c58936b6 | 1067 | merge_graph_nodes (constraint_graph_t graph, unsigned int to, |
910fdc79 DB |
1068 | unsigned int from) |
1069 | { | |
3e5937d7 | 1070 | if (graph->indirect_cycles[from] != -1) |
4ee00913 | 1071 | { |
3e5937d7 DB |
1072 | /* If we have indirect cycles with the from node, and we have |
1073 | none on the to node, the to node has indirect cycles from the | |
1074 | from node now that they are unified. | |
1075 | If indirect cycles exist on both, unify the nodes that they | |
1076 | are in a cycle with, since we know they are in a cycle with | |
1077 | each other. */ | |
1078 | if (graph->indirect_cycles[to] == -1) | |
7b765bed | 1079 | graph->indirect_cycles[to] = graph->indirect_cycles[from]; |
4ee00913 | 1080 | } |
910fdc79 | 1081 | |
57250223 DB |
1082 | /* Merge all the successor edges. */ |
1083 | if (graph->succs[from]) | |
4ee00913 | 1084 | { |
57250223 | 1085 | if (!graph->succs[to]) |
3e5937d7 | 1086 | graph->succs[to] = BITMAP_ALLOC (&pta_obstack); |
c58936b6 | 1087 | bitmap_ior_into (graph->succs[to], |
57250223 | 1088 | graph->succs[from]); |
4ee00913 | 1089 | } |
4ee00913 | 1090 | |
910fdc79 DB |
1091 | clear_edges_for_node (graph, from); |
1092 | } | |
1093 | ||
3e5937d7 DB |
1094 | |
1095 | /* Add an indirect graph edge to GRAPH, going from TO to FROM if | |
1096 | it doesn't exist in the graph already. */ | |
1097 | ||
1098 | static void | |
1099 | add_implicit_graph_edge (constraint_graph_t graph, unsigned int to, | |
1100 | unsigned int from) | |
1101 | { | |
1102 | if (to == from) | |
1103 | return; | |
1104 | ||
1105 | if (!graph->implicit_preds[to]) | |
1106 | graph->implicit_preds[to] = BITMAP_ALLOC (&predbitmap_obstack); | |
1107 | ||
5f0d975b RG |
1108 | if (bitmap_set_bit (graph->implicit_preds[to], from)) |
1109 | stats.num_implicit_edges++; | |
3e5937d7 DB |
1110 | } |
1111 | ||
1112 | /* Add a predecessor graph edge to GRAPH, going from TO to FROM if | |
1113 | it doesn't exist in the graph already. | |
1114 | Return false if the edge already existed, true otherwise. */ | |
1115 | ||
1116 | static void | |
1117 | add_pred_graph_edge (constraint_graph_t graph, unsigned int to, | |
1118 | unsigned int from) | |
1119 | { | |
1120 | if (!graph->preds[to]) | |
1121 | graph->preds[to] = BITMAP_ALLOC (&predbitmap_obstack); | |
5f0d975b | 1122 | bitmap_set_bit (graph->preds[to], from); |
3e5937d7 DB |
1123 | } |
1124 | ||
1125 | /* Add a graph edge to GRAPH, going from FROM to TO if | |
910fdc79 DB |
1126 | it doesn't exist in the graph already. |
1127 | Return false if the edge already existed, true otherwise. */ | |
1128 | ||
1129 | static bool | |
57250223 DB |
1130 | add_graph_edge (constraint_graph_t graph, unsigned int to, |
1131 | unsigned int from) | |
910fdc79 | 1132 | { |
57250223 | 1133 | if (to == from) |
910fdc79 DB |
1134 | { |
1135 | return false; | |
1136 | } | |
1137 | else | |
1138 | { | |
4ee00913 | 1139 | bool r = false; |
c58936b6 | 1140 | |
57250223 | 1141 | if (!graph->succs[from]) |
3e5937d7 | 1142 | graph->succs[from] = BITMAP_ALLOC (&pta_obstack); |
5f0d975b | 1143 | if (bitmap_set_bit (graph->succs[from], to)) |
f71ef09d | 1144 | { |
57250223 | 1145 | r = true; |
3e5937d7 DB |
1146 | if (to < FIRST_REF_NODE && from < FIRST_REF_NODE) |
1147 | stats.num_edges++; | |
f71ef09d | 1148 | } |
910fdc79 DB |
1149 | return r; |
1150 | } | |
1151 | } | |
1152 | ||
1153 | ||
4ee00913 | 1154 | /* Return true if {DEST.SRC} is an existing graph edge in GRAPH. */ |
910fdc79 DB |
1155 | |
1156 | static bool | |
c58936b6 | 1157 | valid_graph_edge (constraint_graph_t graph, unsigned int src, |
4ee00913 | 1158 | unsigned int dest) |
910fdc79 | 1159 | { |
c58936b6 | 1160 | return (graph->succs[dest] |
57250223 | 1161 | && bitmap_bit_p (graph->succs[dest], src)); |
4ee00913 DB |
1162 | } |
1163 | ||
7b765bed DB |
1164 | /* Initialize the constraint graph structure to contain SIZE nodes. */ |
1165 | ||
1166 | static void | |
1167 | init_graph (unsigned int size) | |
1168 | { | |
1169 | unsigned int j; | |
1170 | ||
1171 | graph = XCNEW (struct constraint_graph); | |
1172 | graph->size = size; | |
1173 | graph->succs = XCNEWVEC (bitmap, graph->size); | |
1174 | graph->indirect_cycles = XNEWVEC (int, graph->size); | |
1175 | graph->rep = XNEWVEC (unsigned int, graph->size); | |
1176 | graph->complex = XCNEWVEC (VEC(constraint_t, heap) *, size); | |
aa46c8a3 | 1177 | graph->pe = XCNEWVEC (unsigned int, graph->size); |
7b765bed DB |
1178 | graph->pe_rep = XNEWVEC (int, graph->size); |
1179 | ||
1180 | for (j = 0; j < graph->size; j++) | |
1181 | { | |
1182 | graph->rep[j] = j; | |
7b765bed DB |
1183 | graph->pe_rep[j] = -1; |
1184 | graph->indirect_cycles[j] = -1; | |
1185 | } | |
1186 | } | |
1187 | ||
3e5937d7 | 1188 | /* Build the constraint graph, adding only predecessor edges right now. */ |
910fdc79 DB |
1189 | |
1190 | static void | |
3e5937d7 | 1191 | build_pred_graph (void) |
910fdc79 | 1192 | { |
3e5937d7 | 1193 | int i; |
910fdc79 | 1194 | constraint_t c; |
3e5937d7 | 1195 | unsigned int j; |
910fdc79 | 1196 | |
3e5937d7 DB |
1197 | graph->implicit_preds = XCNEWVEC (bitmap, graph->size); |
1198 | graph->preds = XCNEWVEC (bitmap, graph->size); | |
7b765bed DB |
1199 | graph->pointer_label = XCNEWVEC (unsigned int, graph->size); |
1200 | graph->loc_label = XCNEWVEC (unsigned int, graph->size); | |
1201 | graph->pointed_by = XCNEWVEC (bitmap, graph->size); | |
1202 | graph->points_to = XCNEWVEC (bitmap, graph->size); | |
3e5937d7 | 1203 | graph->eq_rep = XNEWVEC (int, graph->size); |
3e5937d7 | 1204 | graph->direct_nodes = sbitmap_alloc (graph->size); |
7b765bed | 1205 | graph->address_taken = BITMAP_ALLOC (&predbitmap_obstack); |
3e5937d7 DB |
1206 | sbitmap_zero (graph->direct_nodes); |
1207 | ||
1208 | for (j = 0; j < FIRST_REF_NODE; j++) | |
1209 | { | |
1210 | if (!get_varinfo (j)->is_special_var) | |
1211 | SET_BIT (graph->direct_nodes, j); | |
1212 | } | |
1213 | ||
1214 | for (j = 0; j < graph->size; j++) | |
7b765bed | 1215 | graph->eq_rep[j] = -1; |
3e5937d7 DB |
1216 | |
1217 | for (j = 0; j < VEC_length (varinfo_t, varmap); j++) | |
1218 | graph->indirect_cycles[j] = -1; | |
e8ca4159 | 1219 | |
ac47786e | 1220 | FOR_EACH_VEC_ELT (constraint_t, constraints, i, c) |
910fdc79 DB |
1221 | { |
1222 | struct constraint_expr lhs = c->lhs; | |
1223 | struct constraint_expr rhs = c->rhs; | |
5006671f RG |
1224 | unsigned int lhsvar = lhs.var; |
1225 | unsigned int rhsvar = rhs.var; | |
03190594 | 1226 | |
910fdc79 DB |
1227 | if (lhs.type == DEREF) |
1228 | { | |
3e5937d7 DB |
1229 | /* *x = y. */ |
1230 | if (rhs.offset == 0 && lhs.offset == 0 && rhs.type == SCALAR) | |
1231 | add_pred_graph_edge (graph, FIRST_REF_NODE + lhsvar, rhsvar); | |
910fdc79 DB |
1232 | } |
1233 | else if (rhs.type == DEREF) | |
1234 | { | |
3e5937d7 DB |
1235 | /* x = *y */ |
1236 | if (rhs.offset == 0 && lhs.offset == 0 && lhs.type == SCALAR) | |
1237 | add_pred_graph_edge (graph, lhsvar, FIRST_REF_NODE + rhsvar); | |
1238 | else | |
1239 | RESET_BIT (graph->direct_nodes, lhsvar); | |
910fdc79 | 1240 | } |
3e5937d7 | 1241 | else if (rhs.type == ADDRESSOF) |
910fdc79 | 1242 | { |
10bd6c5c RG |
1243 | varinfo_t v; |
1244 | ||
910fdc79 | 1245 | /* x = &y */ |
7b765bed DB |
1246 | if (graph->points_to[lhsvar] == NULL) |
1247 | graph->points_to[lhsvar] = BITMAP_ALLOC (&predbitmap_obstack); | |
1248 | bitmap_set_bit (graph->points_to[lhsvar], rhsvar); | |
1249 | ||
1250 | if (graph->pointed_by[rhsvar] == NULL) | |
1251 | graph->pointed_by[rhsvar] = BITMAP_ALLOC (&predbitmap_obstack); | |
1252 | bitmap_set_bit (graph->pointed_by[rhsvar], lhsvar); | |
1253 | ||
3e5937d7 DB |
1254 | /* Implicitly, *x = y */ |
1255 | add_implicit_graph_edge (graph, FIRST_REF_NODE + lhsvar, rhsvar); | |
1256 | ||
10bd6c5c | 1257 | /* All related variables are no longer direct nodes. */ |
3e5937d7 | 1258 | RESET_BIT (graph->direct_nodes, rhsvar); |
5006671f RG |
1259 | v = get_varinfo (rhsvar); |
1260 | if (!v->is_full_var) | |
1261 | { | |
1262 | v = lookup_vi_for_tree (v->decl); | |
1263 | do | |
1264 | { | |
1265 | RESET_BIT (graph->direct_nodes, v->id); | |
1266 | v = v->next; | |
1267 | } | |
1268 | while (v != NULL); | |
1269 | } | |
7b765bed | 1270 | bitmap_set_bit (graph->address_taken, rhsvar); |
910fdc79 | 1271 | } |
3e5937d7 DB |
1272 | else if (lhsvar > anything_id |
1273 | && lhsvar != rhsvar && lhs.offset == 0 && rhs.offset == 0) | |
910fdc79 | 1274 | { |
3e5937d7 DB |
1275 | /* x = y */ |
1276 | add_pred_graph_edge (graph, lhsvar, rhsvar); | |
1277 | /* Implicitly, *x = *y */ | |
1278 | add_implicit_graph_edge (graph, FIRST_REF_NODE + lhsvar, | |
1279 | FIRST_REF_NODE + rhsvar); | |
1280 | } | |
1281 | else if (lhs.offset != 0 || rhs.offset != 0) | |
1282 | { | |
1283 | if (rhs.offset != 0) | |
1284 | RESET_BIT (graph->direct_nodes, lhs.var); | |
7b765bed | 1285 | else if (lhs.offset != 0) |
3e5937d7 DB |
1286 | RESET_BIT (graph->direct_nodes, rhs.var); |
1287 | } | |
1288 | } | |
1289 | } | |
1290 | ||
1291 | /* Build the constraint graph, adding successor edges. */ | |
1292 | ||
1293 | static void | |
1294 | build_succ_graph (void) | |
1295 | { | |
9e39dba6 | 1296 | unsigned i, t; |
3e5937d7 DB |
1297 | constraint_t c; |
1298 | ||
ac47786e | 1299 | FOR_EACH_VEC_ELT (constraint_t, constraints, i, c) |
3e5937d7 DB |
1300 | { |
1301 | struct constraint_expr lhs; | |
1302 | struct constraint_expr rhs; | |
1303 | unsigned int lhsvar; | |
1304 | unsigned int rhsvar; | |
1305 | ||
1306 | if (!c) | |
1307 | continue; | |
c58936b6 | 1308 | |
3e5937d7 DB |
1309 | lhs = c->lhs; |
1310 | rhs = c->rhs; | |
5006671f RG |
1311 | lhsvar = find (lhs.var); |
1312 | rhsvar = find (rhs.var); | |
3e5937d7 DB |
1313 | |
1314 | if (lhs.type == DEREF) | |
1315 | { | |
1316 | if (rhs.offset == 0 && lhs.offset == 0 && rhs.type == SCALAR) | |
1317 | add_graph_edge (graph, FIRST_REF_NODE + lhsvar, rhsvar); | |
1318 | } | |
1319 | else if (rhs.type == DEREF) | |
1320 | { | |
1321 | if (rhs.offset == 0 && lhs.offset == 0 && lhs.type == SCALAR) | |
1322 | add_graph_edge (graph, lhsvar, FIRST_REF_NODE + rhsvar); | |
1323 | } | |
1324 | else if (rhs.type == ADDRESSOF) | |
1325 | { | |
1326 | /* x = &y */ | |
5006671f | 1327 | gcc_assert (find (rhs.var) == rhs.var); |
3e5937d7 DB |
1328 | bitmap_set_bit (get_varinfo (lhsvar)->solution, rhsvar); |
1329 | } | |
1330 | else if (lhsvar > anything_id | |
1331 | && lhsvar != rhsvar && lhs.offset == 0 && rhs.offset == 0) | |
1332 | { | |
1333 | add_graph_edge (graph, lhsvar, rhsvar); | |
910fdc79 DB |
1334 | } |
1335 | } | |
9e39dba6 | 1336 | |
de925a03 RG |
1337 | /* Add edges from STOREDANYTHING to all non-direct nodes that can |
1338 | receive pointers. */ | |
9e39dba6 RG |
1339 | t = find (storedanything_id); |
1340 | for (i = integer_id + 1; i < FIRST_REF_NODE; ++i) | |
1341 | { | |
de925a03 RG |
1342 | if (!TEST_BIT (graph->direct_nodes, i) |
1343 | && get_varinfo (i)->may_have_pointers) | |
9e39dba6 RG |
1344 | add_graph_edge (graph, find (i), t); |
1345 | } | |
379c6f48 RG |
1346 | |
1347 | /* Everything stored to ANYTHING also potentially escapes. */ | |
1348 | add_graph_edge (graph, find (escaped_id), t); | |
910fdc79 | 1349 | } |
e8ca4159 DN |
1350 | |
1351 | ||
910fdc79 | 1352 | /* Changed variables on the last iteration. */ |
648b5f85 | 1353 | static bitmap changed; |
910fdc79 | 1354 | |
910fdc79 DB |
1355 | /* Strongly Connected Component visitation info. */ |
1356 | ||
1357 | struct scc_info | |
1358 | { | |
1359 | sbitmap visited; | |
7b765bed | 1360 | sbitmap deleted; |
3e5937d7 DB |
1361 | unsigned int *dfs; |
1362 | unsigned int *node_mapping; | |
910fdc79 | 1363 | int current_index; |
740e80e8 | 1364 | VEC(unsigned,heap) *scc_stack; |
910fdc79 DB |
1365 | }; |
1366 | ||
1367 | ||
1368 | /* Recursive routine to find strongly connected components in GRAPH. | |
1369 | SI is the SCC info to store the information in, and N is the id of current | |
1370 | graph node we are processing. | |
c58936b6 | 1371 | |
910fdc79 | 1372 | This is Tarjan's strongly connected component finding algorithm, as |
c58936b6 | 1373 | modified by Nuutila to keep only non-root nodes on the stack. |
910fdc79 DB |
1374 | The algorithm can be found in "On finding the strongly connected |
1375 | connected components in a directed graph" by Esko Nuutila and Eljas | |
1376 | Soisalon-Soininen, in Information Processing Letters volume 49, | |
1377 | number 1, pages 9-14. */ | |
1378 | ||
1379 | static void | |
1380 | scc_visit (constraint_graph_t graph, struct scc_info *si, unsigned int n) | |
1381 | { | |
4ee00913 DB |
1382 | unsigned int i; |
1383 | bitmap_iterator bi; | |
3e5937d7 | 1384 | unsigned int my_dfs; |
910fdc79 | 1385 | |
910fdc79 | 1386 | SET_BIT (si->visited, n); |
3e5937d7 DB |
1387 | si->dfs[n] = si->current_index ++; |
1388 | my_dfs = si->dfs[n]; | |
c58936b6 | 1389 | |
910fdc79 | 1390 | /* Visit all the successors. */ |
57250223 | 1391 | EXECUTE_IF_IN_NONNULL_BITMAP (graph->succs[n], 0, i, bi) |
910fdc79 | 1392 | { |
3e5937d7 DB |
1393 | unsigned int w; |
1394 | ||
1395 | if (i > LAST_REF_NODE) | |
1396 | break; | |
1397 | ||
1398 | w = find (i); | |
7b765bed | 1399 | if (TEST_BIT (si->deleted, w)) |
3e5937d7 DB |
1400 | continue; |
1401 | ||
4ee00913 DB |
1402 | if (!TEST_BIT (si->visited, w)) |
1403 | scc_visit (graph, si, w); | |
3e5937d7 DB |
1404 | { |
1405 | unsigned int t = find (w); | |
1406 | unsigned int nnode = find (n); | |
62e5bf5d | 1407 | gcc_assert (nnode == n); |
3e5937d7 DB |
1408 | |
1409 | if (si->dfs[t] < si->dfs[nnode]) | |
1410 | si->dfs[n] = si->dfs[t]; | |
1411 | } | |
910fdc79 | 1412 | } |
c58936b6 | 1413 | |
910fdc79 | 1414 | /* See if any components have been identified. */ |
3e5937d7 | 1415 | if (si->dfs[n] == my_dfs) |
910fdc79 | 1416 | { |
3e5937d7 DB |
1417 | if (VEC_length (unsigned, si->scc_stack) > 0 |
1418 | && si->dfs[VEC_last (unsigned, si->scc_stack)] >= my_dfs) | |
910fdc79 | 1419 | { |
3e5937d7 | 1420 | bitmap scc = BITMAP_ALLOC (NULL); |
3e5937d7 DB |
1421 | unsigned int lowest_node; |
1422 | bitmap_iterator bi; | |
910fdc79 | 1423 | |
3e5937d7 | 1424 | bitmap_set_bit (scc, n); |
910fdc79 | 1425 | |
3e5937d7 DB |
1426 | while (VEC_length (unsigned, si->scc_stack) != 0 |
1427 | && si->dfs[VEC_last (unsigned, si->scc_stack)] >= my_dfs) | |
1428 | { | |
1429 | unsigned int w = VEC_pop (unsigned, si->scc_stack); | |
910fdc79 | 1430 | |
3e5937d7 | 1431 | bitmap_set_bit (scc, w); |
3e5937d7 | 1432 | } |
4ee00913 | 1433 | |
3e5937d7 DB |
1434 | lowest_node = bitmap_first_set_bit (scc); |
1435 | gcc_assert (lowest_node < FIRST_REF_NODE); | |
7b765bed DB |
1436 | |
1437 | /* Collapse the SCC nodes into a single node, and mark the | |
1438 | indirect cycles. */ | |
3e5937d7 DB |
1439 | EXECUTE_IF_SET_IN_BITMAP (scc, 0, i, bi) |
1440 | { | |
1441 | if (i < FIRST_REF_NODE) | |
1442 | { | |
3e5937d7 DB |
1443 | if (unite (lowest_node, i)) |
1444 | unify_nodes (graph, lowest_node, i, false); | |
1445 | } | |
1446 | else | |
1447 | { | |
1448 | unite (lowest_node, i); | |
1449 | graph->indirect_cycles[i - FIRST_REF_NODE] = lowest_node; | |
1450 | } | |
1451 | } | |
4ee00913 | 1452 | } |
7b765bed | 1453 | SET_BIT (si->deleted, n); |
910fdc79 | 1454 | } |
3e5937d7 DB |
1455 | else |
1456 | VEC_safe_push (unsigned, heap, si->scc_stack, n); | |
910fdc79 DB |
1457 | } |
1458 | ||
3e5937d7 DB |
1459 | /* Unify node FROM into node TO, updating the changed count if |
1460 | necessary when UPDATE_CHANGED is true. */ | |
910fdc79 DB |
1461 | |
1462 | static void | |
3e5937d7 DB |
1463 | unify_nodes (constraint_graph_t graph, unsigned int to, unsigned int from, |
1464 | bool update_changed) | |
910fdc79 | 1465 | { |
910fdc79 | 1466 | |
3e5937d7 DB |
1467 | gcc_assert (to != from && find (to) == to); |
1468 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
1469 | fprintf (dump_file, "Unifying %s to %s\n", | |
1470 | get_varinfo (from)->name, | |
1471 | get_varinfo (to)->name); | |
910fdc79 | 1472 | |
3e5937d7 DB |
1473 | if (update_changed) |
1474 | stats.unified_vars_dynamic++; | |
1475 | else | |
1476 | stats.unified_vars_static++; | |
910fdc79 | 1477 | |
3e5937d7 DB |
1478 | merge_graph_nodes (graph, to, from); |
1479 | merge_node_constraints (graph, to, from); | |
c58936b6 | 1480 | |
7b765bed DB |
1481 | /* Mark TO as changed if FROM was changed. If TO was already marked |
1482 | as changed, decrease the changed count. */ | |
1483 | ||
648b5f85 RG |
1484 | if (update_changed |
1485 | && bitmap_bit_p (changed, from)) | |
910fdc79 | 1486 | { |
648b5f85 RG |
1487 | bitmap_clear_bit (changed, from); |
1488 | bitmap_set_bit (changed, to); | |
3e5937d7 | 1489 | } |
aa46c8a3 | 1490 | if (get_varinfo (from)->solution) |
3e5937d7 | 1491 | { |
aa46c8a3 DB |
1492 | /* If the solution changes because of the merging, we need to mark |
1493 | the variable as changed. */ | |
1494 | if (bitmap_ior_into (get_varinfo (to)->solution, | |
1495 | get_varinfo (from)->solution)) | |
910fdc79 | 1496 | { |
648b5f85 RG |
1497 | if (update_changed) |
1498 | bitmap_set_bit (changed, to); | |
aa46c8a3 | 1499 | } |
b8698a0f | 1500 | |
aa46c8a3 | 1501 | BITMAP_FREE (get_varinfo (from)->solution); |
74d8fa44 RG |
1502 | if (get_varinfo (from)->oldsolution) |
1503 | BITMAP_FREE (get_varinfo (from)->oldsolution); | |
b8698a0f | 1504 | |
74d8fa44 RG |
1505 | if (stats.iterations > 0 |
1506 | && get_varinfo (to)->oldsolution) | |
1507 | BITMAP_FREE (get_varinfo (to)->oldsolution); | |
3e5937d7 | 1508 | } |
3e5937d7 DB |
1509 | if (valid_graph_edge (graph, to, to)) |
1510 | { | |
1511 | if (graph->succs[to]) | |
1512 | bitmap_clear_bit (graph->succs[to], to); | |
910fdc79 | 1513 | } |
910fdc79 DB |
1514 | } |
1515 | ||
910fdc79 DB |
1516 | /* Information needed to compute the topological ordering of a graph. */ |
1517 | ||
1518 | struct topo_info | |
1519 | { | |
1520 | /* sbitmap of visited nodes. */ | |
1521 | sbitmap visited; | |
1522 | /* Array that stores the topological order of the graph, *in | |
1523 | reverse*. */ | |
740e80e8 | 1524 | VEC(unsigned,heap) *topo_order; |
910fdc79 DB |
1525 | }; |
1526 | ||
1527 | ||
1528 | /* Initialize and return a topological info structure. */ | |
1529 | ||
1530 | static struct topo_info * | |
1531 | init_topo_info (void) | |
1532 | { | |
7b765bed | 1533 | size_t size = graph->size; |
5ed6ace5 | 1534 | struct topo_info *ti = XNEW (struct topo_info); |
910fdc79 DB |
1535 | ti->visited = sbitmap_alloc (size); |
1536 | sbitmap_zero (ti->visited); | |
740e80e8 | 1537 | ti->topo_order = VEC_alloc (unsigned, heap, 1); |
910fdc79 DB |
1538 | return ti; |
1539 | } | |
1540 | ||
1541 | ||
1542 | /* Free the topological sort info pointed to by TI. */ | |
1543 | ||
1544 | static void | |
1545 | free_topo_info (struct topo_info *ti) | |
1546 | { | |
1547 | sbitmap_free (ti->visited); | |
740e80e8 | 1548 | VEC_free (unsigned, heap, ti->topo_order); |
910fdc79 DB |
1549 | free (ti); |
1550 | } | |
1551 | ||
1552 | /* Visit the graph in topological order, and store the order in the | |
1553 | topo_info structure. */ | |
1554 | ||
1555 | static void | |
1556 | topo_visit (constraint_graph_t graph, struct topo_info *ti, | |
1557 | unsigned int n) | |
1558 | { | |
4ee00913 | 1559 | bitmap_iterator bi; |
4ee00913 DB |
1560 | unsigned int j; |
1561 | ||
910fdc79 | 1562 | SET_BIT (ti->visited, n); |
4ee00913 | 1563 | |
3e5937d7 DB |
1564 | if (graph->succs[n]) |
1565 | EXECUTE_IF_SET_IN_BITMAP (graph->succs[n], 0, j, bi) | |
4ee00913 DB |
1566 | { |
1567 | if (!TEST_BIT (ti->visited, j)) | |
1568 | topo_visit (graph, ti, j); | |
1569 | } | |
3e5937d7 | 1570 | |
740e80e8 | 1571 | VEC_safe_push (unsigned, heap, ti->topo_order, n); |
910fdc79 DB |
1572 | } |
1573 | ||
5006671f RG |
1574 | /* Process a constraint C that represents x = *(y + off), using DELTA as the |
1575 | starting solution for y. */ | |
910fdc79 DB |
1576 | |
1577 | static void | |
1578 | do_sd_constraint (constraint_graph_t graph, constraint_t c, | |
1579 | bitmap delta) | |
1580 | { | |
7b765bed | 1581 | unsigned int lhs = c->lhs.var; |
910fdc79 DB |
1582 | bool flag = false; |
1583 | bitmap sol = get_varinfo (lhs)->solution; | |
1584 | unsigned int j; | |
1585 | bitmap_iterator bi; | |
5006671f | 1586 | HOST_WIDE_INT roffset = c->rhs.offset; |
4ee00913 | 1587 | |
5006671f RG |
1588 | /* Our IL does not allow this. */ |
1589 | gcc_assert (c->lhs.offset == 0); | |
0e1f4c6b | 1590 | |
5006671f RG |
1591 | /* If the solution of Y contains anything it is good enough to transfer |
1592 | this to the LHS. */ | |
14c28276 RG |
1593 | if (bitmap_bit_p (delta, anything_id)) |
1594 | { | |
1595 | flag |= bitmap_set_bit (sol, anything_id); | |
1596 | goto done; | |
1597 | } | |
1598 | ||
5006671f RG |
1599 | /* If we do not know at with offset the rhs is dereferenced compute |
1600 | the reachability set of DELTA, conservatively assuming it is | |
1601 | dereferenced at all valid offsets. */ | |
1602 | if (roffset == UNKNOWN_OFFSET) | |
1603 | { | |
1604 | solution_set_expand (delta, delta); | |
1605 | /* No further offset processing is necessary. */ | |
1606 | roffset = 0; | |
1607 | } | |
1608 | ||
c58936b6 | 1609 | /* For each variable j in delta (Sol(y)), add |
910fdc79 DB |
1610 | an edge in the graph from j to x, and union Sol(j) into Sol(x). */ |
1611 | EXECUTE_IF_SET_IN_BITMAP (delta, 0, j, bi) | |
1612 | { | |
5006671f RG |
1613 | varinfo_t v = get_varinfo (j); |
1614 | HOST_WIDE_INT fieldoffset = v->offset + roffset; | |
1615 | unsigned int t; | |
1616 | ||
1617 | if (v->is_full_var) | |
1618 | fieldoffset = v->offset; | |
1619 | else if (roffset != 0) | |
1620 | v = first_vi_for_offset (v, fieldoffset); | |
1621 | /* If the access is outside of the variable we can ignore it. */ | |
1622 | if (!v) | |
1623 | continue; | |
910fdc79 | 1624 | |
5006671f RG |
1625 | do |
1626 | { | |
3e5937d7 | 1627 | t = find (v->id); |
4ee00913 DB |
1628 | |
1629 | /* Adding edges from the special vars is pointless. | |
1630 | They don't have sets that can change. */ | |
b7091901 | 1631 | if (get_varinfo (t)->is_special_var) |
4ee00913 | 1632 | flag |= bitmap_ior_into (sol, get_varinfo (t)->solution); |
b7091901 | 1633 | /* Merging the solution from ESCAPED needlessly increases |
472c7fbd | 1634 | the set. Use ESCAPED as representative instead. */ |
5006671f | 1635 | else if (v->id == escaped_id) |
6a66f28e | 1636 | flag |= bitmap_set_bit (sol, escaped_id); |
3c323b52 RG |
1637 | else if (v->may_have_pointers |
1638 | && add_graph_edge (graph, lhs, t)) | |
4ee00913 | 1639 | flag |= bitmap_ior_into (sol, get_varinfo (t)->solution); |
5006671f RG |
1640 | |
1641 | /* If the variable is not exactly at the requested offset | |
1642 | we have to include the next one. */ | |
1643 | if (v->offset == (unsigned HOST_WIDE_INT)fieldoffset | |
1644 | || v->next == NULL) | |
1645 | break; | |
1646 | ||
1647 | v = v->next; | |
1648 | fieldoffset = v->offset; | |
910fdc79 | 1649 | } |
5006671f | 1650 | while (1); |
910fdc79 | 1651 | } |
4cf4d6a3 | 1652 | |
4ee00913 | 1653 | done: |
910fdc79 DB |
1654 | /* If the LHS solution changed, mark the var as changed. */ |
1655 | if (flag) | |
1656 | { | |
1657 | get_varinfo (lhs)->solution = sol; | |
648b5f85 | 1658 | bitmap_set_bit (changed, lhs); |
c58936b6 | 1659 | } |
910fdc79 DB |
1660 | } |
1661 | ||
5006671f RG |
1662 | /* Process a constraint C that represents *(x + off) = y using DELTA |
1663 | as the starting solution for x. */ | |
910fdc79 DB |
1664 | |
1665 | static void | |
57250223 | 1666 | do_ds_constraint (constraint_t c, bitmap delta) |
910fdc79 | 1667 | { |
7b765bed | 1668 | unsigned int rhs = c->rhs.var; |
910fdc79 DB |
1669 | bitmap sol = get_varinfo (rhs)->solution; |
1670 | unsigned int j; | |
1671 | bitmap_iterator bi; | |
5006671f | 1672 | HOST_WIDE_INT loff = c->lhs.offset; |
11152c95 | 1673 | bool escaped_p = false; |
910fdc79 | 1674 | |
9e39dba6 RG |
1675 | /* Our IL does not allow this. */ |
1676 | gcc_assert (c->rhs.offset == 0); | |
1677 | ||
1678 | /* If the solution of y contains ANYTHING simply use the ANYTHING | |
1679 | solution. This avoids needlessly increasing the points-to sets. */ | |
1680 | if (bitmap_bit_p (sol, anything_id)) | |
1681 | sol = get_varinfo (find (anything_id))->solution; | |
1682 | ||
1683 | /* If the solution for x contains ANYTHING we have to merge the | |
1684 | solution of y into all pointer variables which we do via | |
1685 | STOREDANYTHING. */ | |
1686 | if (bitmap_bit_p (delta, anything_id)) | |
1687 | { | |
1688 | unsigned t = find (storedanything_id); | |
1689 | if (add_graph_edge (graph, t, rhs)) | |
1690 | { | |
1691 | if (bitmap_ior_into (get_varinfo (t)->solution, sol)) | |
648b5f85 | 1692 | bitmap_set_bit (changed, t); |
9e39dba6 RG |
1693 | } |
1694 | return; | |
1695 | } | |
4ee00913 | 1696 | |
5006671f RG |
1697 | /* If we do not know at with offset the rhs is dereferenced compute |
1698 | the reachability set of DELTA, conservatively assuming it is | |
1699 | dereferenced at all valid offsets. */ | |
1700 | if (loff == UNKNOWN_OFFSET) | |
1701 | { | |
1702 | solution_set_expand (delta, delta); | |
1703 | loff = 0; | |
1704 | } | |
1705 | ||
910fdc79 DB |
1706 | /* For each member j of delta (Sol(x)), add an edge from y to j and |
1707 | union Sol(y) into Sol(j) */ | |
1708 | EXECUTE_IF_SET_IN_BITMAP (delta, 0, j, bi) | |
1709 | { | |
5006671f RG |
1710 | varinfo_t v = get_varinfo (j); |
1711 | unsigned int t; | |
1712 | HOST_WIDE_INT fieldoffset = v->offset + loff; | |
c58936b6 | 1713 | |
5006671f RG |
1714 | if (v->is_full_var) |
1715 | fieldoffset = v->offset; | |
1716 | else if (loff != 0) | |
1717 | v = first_vi_for_offset (v, fieldoffset); | |
1718 | /* If the access is outside of the variable we can ignore it. */ | |
1719 | if (!v) | |
1720 | continue; | |
57250223 | 1721 | |
5006671f RG |
1722 | do |
1723 | { | |
9e39dba6 | 1724 | if (v->may_have_pointers) |
910fdc79 | 1725 | { |
11152c95 RG |
1726 | /* If v is a global variable then this is an escape point. */ |
1727 | if (v->is_global_var | |
1728 | && !escaped_p) | |
1729 | { | |
1730 | t = find (escaped_id); | |
1731 | if (add_graph_edge (graph, t, rhs) | |
648b5f85 RG |
1732 | && bitmap_ior_into (get_varinfo (t)->solution, sol)) |
1733 | bitmap_set_bit (changed, t); | |
11152c95 RG |
1734 | /* Enough to let rhs escape once. */ |
1735 | escaped_p = true; | |
1736 | } | |
1737 | ||
1738 | if (v->is_special_var) | |
1739 | break; | |
1740 | ||
9e39dba6 | 1741 | t = find (v->id); |
de70bb20 | 1742 | if (add_graph_edge (graph, t, rhs) |
648b5f85 RG |
1743 | && bitmap_ior_into (get_varinfo (t)->solution, sol)) |
1744 | bitmap_set_bit (changed, t); | |
de70bb20 | 1745 | } |
5006671f RG |
1746 | |
1747 | /* If the variable is not exactly at the requested offset | |
1748 | we have to include the next one. */ | |
1749 | if (v->offset == (unsigned HOST_WIDE_INT)fieldoffset | |
1750 | || v->next == NULL) | |
1751 | break; | |
1752 | ||
1753 | v = v->next; | |
1754 | fieldoffset = v->offset; | |
57250223 | 1755 | } |
5006671f | 1756 | while (1); |
910fdc79 DB |
1757 | } |
1758 | } | |
1759 | ||
3e5937d7 DB |
1760 | /* Handle a non-simple (simple meaning requires no iteration), |
1761 | constraint (IE *x = &y, x = *y, *x = y, and x = y with offsets involved). */ | |
c58936b6 | 1762 | |
910fdc79 DB |
1763 | static void |
1764 | do_complex_constraint (constraint_graph_t graph, constraint_t c, bitmap delta) | |
1765 | { | |
1766 | if (c->lhs.type == DEREF) | |
1767 | { | |
1768 | if (c->rhs.type == ADDRESSOF) | |
1769 | { | |
7b765bed | 1770 | gcc_unreachable(); |
910fdc79 DB |
1771 | } |
1772 | else | |
1773 | { | |
1774 | /* *x = y */ | |
57250223 | 1775 | do_ds_constraint (c, delta); |
910fdc79 DB |
1776 | } |
1777 | } | |
57250223 | 1778 | else if (c->rhs.type == DEREF) |
910fdc79 DB |
1779 | { |
1780 | /* x = *y */ | |
13c2c08b DB |
1781 | if (!(get_varinfo (c->lhs.var)->is_special_var)) |
1782 | do_sd_constraint (graph, c, delta); | |
910fdc79 | 1783 | } |
c58936b6 | 1784 | else |
57250223 | 1785 | { |
c58936b6 | 1786 | bitmap tmp; |
57250223 DB |
1787 | bitmap solution; |
1788 | bool flag = false; | |
57250223 | 1789 | |
62e5bf5d | 1790 | gcc_assert (c->rhs.type == SCALAR && c->lhs.type == SCALAR); |
7b765bed DB |
1791 | solution = get_varinfo (c->rhs.var)->solution; |
1792 | tmp = get_varinfo (c->lhs.var)->solution; | |
57250223 DB |
1793 | |
1794 | flag = set_union_with_increment (tmp, solution, c->rhs.offset); | |
c58936b6 | 1795 | |
57250223 DB |
1796 | if (flag) |
1797 | { | |
7b765bed | 1798 | get_varinfo (c->lhs.var)->solution = tmp; |
648b5f85 | 1799 | bitmap_set_bit (changed, c->lhs.var); |
57250223 DB |
1800 | } |
1801 | } | |
910fdc79 DB |
1802 | } |
1803 | ||
1804 | /* Initialize and return a new SCC info structure. */ | |
1805 | ||
1806 | static struct scc_info * | |
3e5937d7 | 1807 | init_scc_info (size_t size) |
910fdc79 | 1808 | { |
5ed6ace5 | 1809 | struct scc_info *si = XNEW (struct scc_info); |
3e5937d7 | 1810 | size_t i; |
910fdc79 DB |
1811 | |
1812 | si->current_index = 0; | |
1813 | si->visited = sbitmap_alloc (size); | |
1814 | sbitmap_zero (si->visited); | |
7b765bed DB |
1815 | si->deleted = sbitmap_alloc (size); |
1816 | sbitmap_zero (si->deleted); | |
3e5937d7 DB |
1817 | si->node_mapping = XNEWVEC (unsigned int, size); |
1818 | si->dfs = XCNEWVEC (unsigned int, size); | |
1819 | ||
1820 | for (i = 0; i < size; i++) | |
1821 | si->node_mapping[i] = i; | |
1822 | ||
740e80e8 | 1823 | si->scc_stack = VEC_alloc (unsigned, heap, 1); |
910fdc79 DB |
1824 | return si; |
1825 | } | |
1826 | ||
1827 | /* Free an SCC info structure pointed to by SI */ | |
1828 | ||
1829 | static void | |
1830 | free_scc_info (struct scc_info *si) | |
c58936b6 | 1831 | { |
910fdc79 | 1832 | sbitmap_free (si->visited); |
7b765bed | 1833 | sbitmap_free (si->deleted); |
3e5937d7 DB |
1834 | free (si->node_mapping); |
1835 | free (si->dfs); | |
740e80e8 | 1836 | VEC_free (unsigned, heap, si->scc_stack); |
3e5937d7 | 1837 | free (si); |
910fdc79 DB |
1838 | } |
1839 | ||
1840 | ||
3e5937d7 DB |
1841 | /* Find indirect cycles in GRAPH that occur, using strongly connected |
1842 | components, and note them in the indirect cycles map. | |
1843 | ||
1844 | This technique comes from Ben Hardekopf and Calvin Lin, | |
1845 | "It Pays to be Lazy: Fast and Accurate Pointer Analysis for Millions of | |
1846 | Lines of Code", submitted to PLDI 2007. */ | |
910fdc79 DB |
1847 | |
1848 | static void | |
3e5937d7 | 1849 | find_indirect_cycles (constraint_graph_t graph) |
910fdc79 DB |
1850 | { |
1851 | unsigned int i; | |
3e5937d7 DB |
1852 | unsigned int size = graph->size; |
1853 | struct scc_info *si = init_scc_info (size); | |
910fdc79 | 1854 | |
3e5937d7 DB |
1855 | for (i = 0; i < MIN (LAST_REF_NODE, size); i ++ ) |
1856 | if (!TEST_BIT (si->visited, i) && find (i) == i) | |
910fdc79 | 1857 | scc_visit (graph, si, i); |
c58936b6 | 1858 | |
910fdc79 DB |
1859 | free_scc_info (si); |
1860 | } | |
1861 | ||
1862 | /* Compute a topological ordering for GRAPH, and store the result in the | |
1863 | topo_info structure TI. */ | |
1864 | ||
c58936b6 | 1865 | static void |
910fdc79 DB |
1866 | compute_topo_order (constraint_graph_t graph, |
1867 | struct topo_info *ti) | |
1868 | { | |
1869 | unsigned int i; | |
7b765bed | 1870 | unsigned int size = graph->size; |
c58936b6 | 1871 | |
910fdc79 | 1872 | for (i = 0; i != size; ++i) |
3e5937d7 | 1873 | if (!TEST_BIT (ti->visited, i) && find (i) == i) |
910fdc79 DB |
1874 | topo_visit (graph, ti, i); |
1875 | } | |
1876 | ||
7b765bed DB |
1877 | /* Structure used to for hash value numbering of pointer equivalence |
1878 | classes. */ | |
1879 | ||
1880 | typedef struct equiv_class_label | |
1881 | { | |
3691626c | 1882 | hashval_t hashcode; |
7b765bed DB |
1883 | unsigned int equivalence_class; |
1884 | bitmap labels; | |
7b765bed | 1885 | } *equiv_class_label_t; |
586de218 | 1886 | typedef const struct equiv_class_label *const_equiv_class_label_t; |
7b765bed DB |
1887 | |
1888 | /* A hashtable for mapping a bitmap of labels->pointer equivalence | |
1889 | classes. */ | |
1890 | static htab_t pointer_equiv_class_table; | |
1891 | ||
1892 | /* A hashtable for mapping a bitmap of labels->location equivalence | |
1893 | classes. */ | |
1894 | static htab_t location_equiv_class_table; | |
1895 | ||
1896 | /* Hash function for a equiv_class_label_t */ | |
1897 | ||
1898 | static hashval_t | |
1899 | equiv_class_label_hash (const void *p) | |
1900 | { | |
586de218 | 1901 | const_equiv_class_label_t const ecl = (const_equiv_class_label_t) p; |
7b765bed DB |
1902 | return ecl->hashcode; |
1903 | } | |
1904 | ||
1905 | /* Equality function for two equiv_class_label_t's. */ | |
1906 | ||
1907 | static int | |
1908 | equiv_class_label_eq (const void *p1, const void *p2) | |
1909 | { | |
586de218 KG |
1910 | const_equiv_class_label_t const eql1 = (const_equiv_class_label_t) p1; |
1911 | const_equiv_class_label_t const eql2 = (const_equiv_class_label_t) p2; | |
821bb7f8 RG |
1912 | return (eql1->hashcode == eql2->hashcode |
1913 | && bitmap_equal_p (eql1->labels, eql2->labels)); | |
7b765bed DB |
1914 | } |
1915 | ||
1916 | /* Lookup a equivalence class in TABLE by the bitmap of LABELS it | |
1917 | contains. */ | |
1918 | ||
1919 | static unsigned int | |
1920 | equiv_class_lookup (htab_t table, bitmap labels) | |
1921 | { | |
1922 | void **slot; | |
1923 | struct equiv_class_label ecl; | |
1924 | ||
1925 | ecl.labels = labels; | |
1926 | ecl.hashcode = bitmap_hash (labels); | |
c58936b6 | 1927 | |
7b765bed DB |
1928 | slot = htab_find_slot_with_hash (table, &ecl, |
1929 | ecl.hashcode, NO_INSERT); | |
1930 | if (!slot) | |
1931 | return 0; | |
1932 | else | |
1933 | return ((equiv_class_label_t) *slot)->equivalence_class; | |
1934 | } | |
1935 | ||
1936 | ||
1937 | /* Add an equivalence class named EQUIVALENCE_CLASS with labels LABELS | |
1938 | to TABLE. */ | |
1939 | ||
1940 | static void | |
1941 | equiv_class_add (htab_t table, unsigned int equivalence_class, | |
1942 | bitmap labels) | |
1943 | { | |
1944 | void **slot; | |
1945 | equiv_class_label_t ecl = XNEW (struct equiv_class_label); | |
1946 | ||
1947 | ecl->labels = labels; | |
1948 | ecl->equivalence_class = equivalence_class; | |
1949 | ecl->hashcode = bitmap_hash (labels); | |
1950 | ||
1951 | slot = htab_find_slot_with_hash (table, ecl, | |
1952 | ecl->hashcode, INSERT); | |
1953 | gcc_assert (!*slot); | |
1954 | *slot = (void *) ecl; | |
1955 | } | |
1956 | ||
1957 | /* Perform offline variable substitution. | |
910fdc79 | 1958 | |
7b765bed DB |
1959 | This is a worst case quadratic time way of identifying variables |
1960 | that must have equivalent points-to sets, including those caused by | |
1961 | static cycles, and single entry subgraphs, in the constraint graph. | |
3e5937d7 | 1962 | |
7b765bed DB |
1963 | The technique is described in "Exploiting Pointer and Location |
1964 | Equivalence to Optimize Pointer Analysis. In the 14th International | |
1965 | Static Analysis Symposium (SAS), August 2007." It is known as the | |
1966 | "HU" algorithm, and is equivalent to value numbering the collapsed | |
1967 | constraint graph including evaluating unions. | |
3e5937d7 DB |
1968 | |
1969 | The general method of finding equivalence classes is as follows: | |
1970 | Add fake nodes (REF nodes) and edges for *a = b and a = *b constraints. | |
7b765bed DB |
1971 | Initialize all non-REF nodes to be direct nodes. |
1972 | For each constraint a = a U {b}, we set pts(a) = pts(a) u {fresh | |
1973 | variable} | |
1974 | For each constraint containing the dereference, we also do the same | |
1975 | thing. | |
1976 | ||
1977 | We then compute SCC's in the graph and unify nodes in the same SCC, | |
1978 | including pts sets. | |
1979 | ||
1980 | For each non-collapsed node x: | |
1981 | Visit all unvisited explicit incoming edges. | |
1982 | Ignoring all non-pointers, set pts(x) = Union of pts(a) for y | |
1983 | where y->x. | |
1984 | Lookup the equivalence class for pts(x). | |
1985 | If we found one, equivalence_class(x) = found class. | |
1986 | Otherwise, equivalence_class(x) = new class, and new_class is | |
1987 | added to the lookup table. | |
3e5937d7 DB |
1988 | |
1989 | All direct nodes with the same equivalence class can be replaced | |
1990 | with a single representative node. | |
1991 | All unlabeled nodes (label == 0) are not pointers and all edges | |
1992 | involving them can be eliminated. | |
7b765bed DB |
1993 | We perform these optimizations during rewrite_constraints |
1994 | ||
1995 | In addition to pointer equivalence class finding, we also perform | |
1996 | location equivalence class finding. This is the set of variables | |
1997 | that always appear together in points-to sets. We use this to | |
1998 | compress the size of the points-to sets. */ | |
1999 | ||
2000 | /* Current maximum pointer equivalence class id. */ | |
2001 | static int pointer_equiv_class; | |
3e5937d7 | 2002 | |
7b765bed DB |
2003 | /* Current maximum location equivalence class id. */ |
2004 | static int location_equiv_class; | |
3e5937d7 DB |
2005 | |
2006 | /* Recursive routine to find strongly connected components in GRAPH, | |
7b765bed | 2007 | and label it's nodes with DFS numbers. */ |
910fdc79 DB |
2008 | |
2009 | static void | |
7b765bed | 2010 | condense_visit (constraint_graph_t graph, struct scc_info *si, unsigned int n) |
910fdc79 | 2011 | { |
3e5937d7 DB |
2012 | unsigned int i; |
2013 | bitmap_iterator bi; | |
2014 | unsigned int my_dfs; | |
c58936b6 | 2015 | |
3e5937d7 DB |
2016 | gcc_assert (si->node_mapping[n] == n); |
2017 | SET_BIT (si->visited, n); | |
2018 | si->dfs[n] = si->current_index ++; | |
2019 | my_dfs = si->dfs[n]; | |
c58936b6 | 2020 | |
3e5937d7 DB |
2021 | /* Visit all the successors. */ |
2022 | EXECUTE_IF_IN_NONNULL_BITMAP (graph->preds[n], 0, i, bi) | |
910fdc79 | 2023 | { |
3e5937d7 | 2024 | unsigned int w = si->node_mapping[i]; |
910fdc79 | 2025 | |
7b765bed | 2026 | if (TEST_BIT (si->deleted, w)) |
910fdc79 DB |
2027 | continue; |
2028 | ||
3e5937d7 | 2029 | if (!TEST_BIT (si->visited, w)) |
7b765bed | 2030 | condense_visit (graph, si, w); |
3e5937d7 DB |
2031 | { |
2032 | unsigned int t = si->node_mapping[w]; | |
2033 | unsigned int nnode = si->node_mapping[n]; | |
62e5bf5d | 2034 | gcc_assert (nnode == n); |
910fdc79 | 2035 | |
3e5937d7 DB |
2036 | if (si->dfs[t] < si->dfs[nnode]) |
2037 | si->dfs[n] = si->dfs[t]; | |
2038 | } | |
2039 | } | |
910fdc79 | 2040 | |
3e5937d7 DB |
2041 | /* Visit all the implicit predecessors. */ |
2042 | EXECUTE_IF_IN_NONNULL_BITMAP (graph->implicit_preds[n], 0, i, bi) | |
2043 | { | |
2044 | unsigned int w = si->node_mapping[i]; | |
2045 | ||
7b765bed | 2046 | if (TEST_BIT (si->deleted, w)) |
3e5937d7 DB |
2047 | continue; |
2048 | ||
2049 | if (!TEST_BIT (si->visited, w)) | |
7b765bed | 2050 | condense_visit (graph, si, w); |
3e5937d7 DB |
2051 | { |
2052 | unsigned int t = si->node_mapping[w]; | |
2053 | unsigned int nnode = si->node_mapping[n]; | |
2054 | gcc_assert (nnode == n); | |
2055 | ||
2056 | if (si->dfs[t] < si->dfs[nnode]) | |
2057 | si->dfs[n] = si->dfs[t]; | |
2058 | } | |
2059 | } | |
4ee00913 | 2060 | |
3e5937d7 DB |
2061 | /* See if any components have been identified. */ |
2062 | if (si->dfs[n] == my_dfs) | |
2063 | { | |
2064 | while (VEC_length (unsigned, si->scc_stack) != 0 | |
2065 | && si->dfs[VEC_last (unsigned, si->scc_stack)] >= my_dfs) | |
910fdc79 | 2066 | { |
3e5937d7 DB |
2067 | unsigned int w = VEC_pop (unsigned, si->scc_stack); |
2068 | si->node_mapping[w] = n; | |
2069 | ||
2070 | if (!TEST_BIT (graph->direct_nodes, w)) | |
2071 | RESET_BIT (graph->direct_nodes, n); | |
3e5937d7 | 2072 | |
7b765bed DB |
2073 | /* Unify our nodes. */ |
2074 | if (graph->preds[w]) | |
2075 | { | |
2076 | if (!graph->preds[n]) | |
2077 | graph->preds[n] = BITMAP_ALLOC (&predbitmap_obstack); | |
2078 | bitmap_ior_into (graph->preds[n], graph->preds[w]); | |
2079 | } | |
2080 | if (graph->implicit_preds[w]) | |
2081 | { | |
2082 | if (!graph->implicit_preds[n]) | |
2083 | graph->implicit_preds[n] = BITMAP_ALLOC (&predbitmap_obstack); | |
2084 | bitmap_ior_into (graph->implicit_preds[n], | |
2085 | graph->implicit_preds[w]); | |
2086 | } | |
2087 | if (graph->points_to[w]) | |
2088 | { | |
2089 | if (!graph->points_to[n]) | |
2090 | graph->points_to[n] = BITMAP_ALLOC (&predbitmap_obstack); | |
2091 | bitmap_ior_into (graph->points_to[n], | |
2092 | graph->points_to[w]); | |
2093 | } | |
3e5937d7 | 2094 | } |
7b765bed | 2095 | SET_BIT (si->deleted, n); |
3e5937d7 DB |
2096 | } |
2097 | else | |
2098 | VEC_safe_push (unsigned, heap, si->scc_stack, n); | |
2099 | } | |
2100 | ||
7b765bed DB |
2101 | /* Label pointer equivalences. */ |
2102 | ||
2103 | static void | |
2104 | label_visit (constraint_graph_t graph, struct scc_info *si, unsigned int n) | |
2105 | { | |
2106 | unsigned int i; | |
2107 | bitmap_iterator bi; | |
2108 | SET_BIT (si->visited, n); | |
2109 | ||
2110 | if (!graph->points_to[n]) | |
2111 | graph->points_to[n] = BITMAP_ALLOC (&predbitmap_obstack); | |
2112 | ||
2113 | /* Label and union our incoming edges's points to sets. */ | |
2114 | EXECUTE_IF_IN_NONNULL_BITMAP (graph->preds[n], 0, i, bi) | |
2115 | { | |
2116 | unsigned int w = si->node_mapping[i]; | |
2117 | if (!TEST_BIT (si->visited, w)) | |
2118 | label_visit (graph, si, w); | |
2119 | ||
2120 | /* Skip unused edges */ | |
2121 | if (w == n || graph->pointer_label[w] == 0) | |
3dc21182 DB |
2122 | continue; |
2123 | ||
7b765bed DB |
2124 | if (graph->points_to[w]) |
2125 | bitmap_ior_into(graph->points_to[n], graph->points_to[w]); | |
7b765bed DB |
2126 | } |
2127 | /* Indirect nodes get fresh variables. */ | |
2128 | if (!TEST_BIT (graph->direct_nodes, n)) | |
2129 | bitmap_set_bit (graph->points_to[n], FIRST_REF_NODE + n); | |
2130 | ||
2131 | if (!bitmap_empty_p (graph->points_to[n])) | |
2132 | { | |
2133 | unsigned int label = equiv_class_lookup (pointer_equiv_class_table, | |
2134 | graph->points_to[n]); | |
2135 | if (!label) | |
2136 | { | |
7b765bed DB |
2137 | label = pointer_equiv_class++; |
2138 | equiv_class_add (pointer_equiv_class_table, | |
2139 | label, graph->points_to[n]); | |
2140 | } | |
2141 | graph->pointer_label[n] = label; | |
2142 | } | |
2143 | } | |
2144 | ||
3e5937d7 DB |
2145 | /* Perform offline variable substitution, discovering equivalence |
2146 | classes, and eliminating non-pointer variables. */ | |
2147 | ||
2148 | static struct scc_info * | |
2149 | perform_var_substitution (constraint_graph_t graph) | |
2150 | { | |
2151 | unsigned int i; | |
2152 | unsigned int size = graph->size; | |
2153 | struct scc_info *si = init_scc_info (size); | |
2154 | ||
2155 | bitmap_obstack_initialize (&iteration_obstack); | |
7b765bed DB |
2156 | pointer_equiv_class_table = htab_create (511, equiv_class_label_hash, |
2157 | equiv_class_label_eq, free); | |
2158 | location_equiv_class_table = htab_create (511, equiv_class_label_hash, | |
2159 | equiv_class_label_eq, free); | |
2160 | pointer_equiv_class = 1; | |
2161 | location_equiv_class = 1; | |
2162 | ||
2163 | /* Condense the nodes, which means to find SCC's, count incoming | |
2164 | predecessors, and unite nodes in SCC's. */ | |
aa46c8a3 | 2165 | for (i = 0; i < FIRST_REF_NODE; i++) |
7b765bed DB |
2166 | if (!TEST_BIT (si->visited, si->node_mapping[i])) |
2167 | condense_visit (graph, si, si->node_mapping[i]); | |
3e5937d7 | 2168 | |
7b765bed DB |
2169 | sbitmap_zero (si->visited); |
2170 | /* Actually the label the nodes for pointer equivalences */ | |
aa46c8a3 | 2171 | for (i = 0; i < FIRST_REF_NODE; i++) |
3e5937d7 DB |
2172 | if (!TEST_BIT (si->visited, si->node_mapping[i])) |
2173 | label_visit (graph, si, si->node_mapping[i]); | |
2174 | ||
7b765bed DB |
2175 | /* Calculate location equivalence labels. */ |
2176 | for (i = 0; i < FIRST_REF_NODE; i++) | |
2177 | { | |
2178 | bitmap pointed_by; | |
2179 | bitmap_iterator bi; | |
2180 | unsigned int j; | |
2181 | unsigned int label; | |
2182 | ||
2183 | if (!graph->pointed_by[i]) | |
2184 | continue; | |
2185 | pointed_by = BITMAP_ALLOC (&iteration_obstack); | |
2186 | ||
2187 | /* Translate the pointed-by mapping for pointer equivalence | |
2188 | labels. */ | |
2189 | EXECUTE_IF_SET_IN_BITMAP (graph->pointed_by[i], 0, j, bi) | |
2190 | { | |
2191 | bitmap_set_bit (pointed_by, | |
2192 | graph->pointer_label[si->node_mapping[j]]); | |
2193 | } | |
2194 | /* The original pointed_by is now dead. */ | |
2195 | BITMAP_FREE (graph->pointed_by[i]); | |
2196 | ||
2197 | /* Look up the location equivalence label if one exists, or make | |
2198 | one otherwise. */ | |
2199 | label = equiv_class_lookup (location_equiv_class_table, | |
2200 | pointed_by); | |
2201 | if (label == 0) | |
2202 | { | |
2203 | label = location_equiv_class++; | |
2204 | equiv_class_add (location_equiv_class_table, | |
2205 | label, pointed_by); | |
2206 | } | |
2207 | else | |
2208 | { | |
2209 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
2210 | fprintf (dump_file, "Found location equivalence for node %s\n", | |
2211 | get_varinfo (i)->name); | |
2212 | BITMAP_FREE (pointed_by); | |
2213 | } | |
2214 | graph->loc_label[i] = label; | |
2215 | ||
2216 | } | |
2217 | ||
3e5937d7 DB |
2218 | if (dump_file && (dump_flags & TDF_DETAILS)) |
2219 | for (i = 0; i < FIRST_REF_NODE; i++) | |
2220 | { | |
2221 | bool direct_node = TEST_BIT (graph->direct_nodes, i); | |
2222 | fprintf (dump_file, | |
7b765bed DB |
2223 | "Equivalence classes for %s node id %d:%s are pointer: %d" |
2224 | ", location:%d\n", | |
3e5937d7 | 2225 | direct_node ? "Direct node" : "Indirect node", i, |
62e5bf5d | 2226 | get_varinfo (i)->name, |
7b765bed DB |
2227 | graph->pointer_label[si->node_mapping[i]], |
2228 | graph->loc_label[si->node_mapping[i]]); | |
3e5937d7 DB |
2229 | } |
2230 | ||
2231 | /* Quickly eliminate our non-pointer variables. */ | |
2232 | ||
2233 | for (i = 0; i < FIRST_REF_NODE; i++) | |
2234 | { | |
2235 | unsigned int node = si->node_mapping[i]; | |
2236 | ||
aa46c8a3 | 2237 | if (graph->pointer_label[node] == 0) |
3e5937d7 | 2238 | { |
23e73993 | 2239 | if (dump_file && (dump_flags & TDF_DETAILS)) |
3e5937d7 DB |
2240 | fprintf (dump_file, |
2241 | "%s is a non-pointer variable, eliminating edges.\n", | |
2242 | get_varinfo (node)->name); | |
2243 | stats.nonpointer_vars++; | |
2244 | clear_edges_for_node (graph, node); | |
910fdc79 DB |
2245 | } |
2246 | } | |
7b765bed | 2247 | |
3e5937d7 DB |
2248 | return si; |
2249 | } | |
2250 | ||
2251 | /* Free information that was only necessary for variable | |
2252 | substitution. */ | |
910fdc79 | 2253 | |
3e5937d7 DB |
2254 | static void |
2255 | free_var_substitution_info (struct scc_info *si) | |
2256 | { | |
2257 | free_scc_info (si); | |
7b765bed DB |
2258 | free (graph->pointer_label); |
2259 | free (graph->loc_label); | |
2260 | free (graph->pointed_by); | |
2261 | free (graph->points_to); | |
3e5937d7 DB |
2262 | free (graph->eq_rep); |
2263 | sbitmap_free (graph->direct_nodes); | |
7b765bed DB |
2264 | htab_delete (pointer_equiv_class_table); |
2265 | htab_delete (location_equiv_class_table); | |
4ee00913 | 2266 | bitmap_obstack_release (&iteration_obstack); |
3e5937d7 DB |
2267 | } |
2268 | ||
2269 | /* Return an existing node that is equivalent to NODE, which has | |
2270 | equivalence class LABEL, if one exists. Return NODE otherwise. */ | |
2271 | ||
2272 | static unsigned int | |
2273 | find_equivalent_node (constraint_graph_t graph, | |
2274 | unsigned int node, unsigned int label) | |
2275 | { | |
2276 | /* If the address version of this variable is unused, we can | |
2277 | substitute it for anything else with the same label. | |
2278 | Otherwise, we know the pointers are equivalent, but not the | |
7b765bed | 2279 | locations, and we can unite them later. */ |
3e5937d7 | 2280 | |
7b765bed | 2281 | if (!bitmap_bit_p (graph->address_taken, node)) |
3e5937d7 DB |
2282 | { |
2283 | gcc_assert (label < graph->size); | |
2284 | ||
2285 | if (graph->eq_rep[label] != -1) | |
2286 | { | |
2287 | /* Unify the two variables since we know they are equivalent. */ | |
2288 | if (unite (graph->eq_rep[label], node)) | |
2289 | unify_nodes (graph, graph->eq_rep[label], node, false); | |
2290 | return graph->eq_rep[label]; | |
2291 | } | |
2292 | else | |
2293 | { | |
2294 | graph->eq_rep[label] = node; | |
7b765bed | 2295 | graph->pe_rep[label] = node; |
3e5937d7 DB |
2296 | } |
2297 | } | |
7b765bed DB |
2298 | else |
2299 | { | |
2300 | gcc_assert (label < graph->size); | |
2301 | graph->pe[node] = label; | |
2302 | if (graph->pe_rep[label] == -1) | |
2303 | graph->pe_rep[label] = node; | |
2304 | } | |
2305 | ||
3e5937d7 DB |
2306 | return node; |
2307 | } | |
2308 | ||
7b765bed DB |
2309 | /* Unite pointer equivalent but not location equivalent nodes in |
2310 | GRAPH. This may only be performed once variable substitution is | |
2311 | finished. */ | |
2312 | ||
2313 | static void | |
2314 | unite_pointer_equivalences (constraint_graph_t graph) | |
2315 | { | |
2316 | unsigned int i; | |
2317 | ||
2318 | /* Go through the pointer equivalences and unite them to their | |
2319 | representative, if they aren't already. */ | |
aa46c8a3 | 2320 | for (i = 0; i < FIRST_REF_NODE; i++) |
7b765bed DB |
2321 | { |
2322 | unsigned int label = graph->pe[i]; | |
aa46c8a3 DB |
2323 | if (label) |
2324 | { | |
2325 | int label_rep = graph->pe_rep[label]; | |
b8698a0f | 2326 | |
aa46c8a3 DB |
2327 | if (label_rep == -1) |
2328 | continue; | |
b8698a0f | 2329 | |
aa46c8a3 DB |
2330 | label_rep = find (label_rep); |
2331 | if (label_rep >= 0 && unite (label_rep, find (i))) | |
2332 | unify_nodes (graph, label_rep, i, false); | |
2333 | } | |
7b765bed DB |
2334 | } |
2335 | } | |
2336 | ||
2337 | /* Move complex constraints to the GRAPH nodes they belong to. */ | |
3e5937d7 DB |
2338 | |
2339 | static void | |
7b765bed DB |
2340 | move_complex_constraints (constraint_graph_t graph) |
2341 | { | |
2342 | int i; | |
2343 | constraint_t c; | |
2344 | ||
ac47786e | 2345 | FOR_EACH_VEC_ELT (constraint_t, constraints, i, c) |
7b765bed DB |
2346 | { |
2347 | if (c) | |
2348 | { | |
2349 | struct constraint_expr lhs = c->lhs; | |
2350 | struct constraint_expr rhs = c->rhs; | |
2351 | ||
2352 | if (lhs.type == DEREF) | |
2353 | { | |
2354 | insert_into_complex (graph, lhs.var, c); | |
2355 | } | |
2356 | else if (rhs.type == DEREF) | |
2357 | { | |
2358 | if (!(get_varinfo (lhs.var)->is_special_var)) | |
2359 | insert_into_complex (graph, rhs.var, c); | |
2360 | } | |
2361 | else if (rhs.type != ADDRESSOF && lhs.var > anything_id | |
2362 | && (lhs.offset != 0 || rhs.offset != 0)) | |
2363 | { | |
2364 | insert_into_complex (graph, rhs.var, c); | |
2365 | } | |
2366 | } | |
2367 | } | |
2368 | } | |
2369 | ||
2370 | ||
2371 | /* Optimize and rewrite complex constraints while performing | |
2372 | collapsing of equivalent nodes. SI is the SCC_INFO that is the | |
2373 | result of perform_variable_substitution. */ | |
2374 | ||
2375 | static void | |
2376 | rewrite_constraints (constraint_graph_t graph, | |
2377 | struct scc_info *si) | |
3e5937d7 DB |
2378 | { |
2379 | int i; | |
2380 | unsigned int j; | |
2381 | constraint_t c; | |
2382 | ||
2383 | for (j = 0; j < graph->size; j++) | |
2384 | gcc_assert (find (j) == j); | |
2385 | ||
ac47786e | 2386 | FOR_EACH_VEC_ELT (constraint_t, constraints, i, c) |
3e5937d7 DB |
2387 | { |
2388 | struct constraint_expr lhs = c->lhs; | |
2389 | struct constraint_expr rhs = c->rhs; | |
5006671f RG |
2390 | unsigned int lhsvar = find (lhs.var); |
2391 | unsigned int rhsvar = find (rhs.var); | |
3e5937d7 DB |
2392 | unsigned int lhsnode, rhsnode; |
2393 | unsigned int lhslabel, rhslabel; | |
2394 | ||
2395 | lhsnode = si->node_mapping[lhsvar]; | |
2396 | rhsnode = si->node_mapping[rhsvar]; | |
7b765bed DB |
2397 | lhslabel = graph->pointer_label[lhsnode]; |
2398 | rhslabel = graph->pointer_label[rhsnode]; | |
3e5937d7 DB |
2399 | |
2400 | /* See if it is really a non-pointer variable, and if so, ignore | |
2401 | the constraint. */ | |
2402 | if (lhslabel == 0) | |
2403 | { | |
aa46c8a3 | 2404 | if (dump_file && (dump_flags & TDF_DETAILS)) |
3e5937d7 | 2405 | { |
b8698a0f | 2406 | |
aa46c8a3 DB |
2407 | fprintf (dump_file, "%s is a non-pointer variable," |
2408 | "ignoring constraint:", | |
2409 | get_varinfo (lhs.var)->name); | |
2410 | dump_constraint (dump_file, c); | |
8576f20a | 2411 | fprintf (dump_file, "\n"); |
3e5937d7 | 2412 | } |
aa46c8a3 DB |
2413 | VEC_replace (constraint_t, constraints, i, NULL); |
2414 | continue; | |
3e5937d7 DB |
2415 | } |
2416 | ||
2417 | if (rhslabel == 0) | |
2418 | { | |
aa46c8a3 | 2419 | if (dump_file && (dump_flags & TDF_DETAILS)) |
3e5937d7 | 2420 | { |
b8698a0f | 2421 | |
aa46c8a3 DB |
2422 | fprintf (dump_file, "%s is a non-pointer variable," |
2423 | "ignoring constraint:", | |
2424 | get_varinfo (rhs.var)->name); | |
2425 | dump_constraint (dump_file, c); | |
8576f20a | 2426 | fprintf (dump_file, "\n"); |
3e5937d7 | 2427 | } |
aa46c8a3 DB |
2428 | VEC_replace (constraint_t, constraints, i, NULL); |
2429 | continue; | |
3e5937d7 DB |
2430 | } |
2431 | ||
2432 | lhsvar = find_equivalent_node (graph, lhsvar, lhslabel); | |
2433 | rhsvar = find_equivalent_node (graph, rhsvar, rhslabel); | |
2434 | c->lhs.var = lhsvar; | |
2435 | c->rhs.var = rhsvar; | |
2436 | ||
3e5937d7 DB |
2437 | } |
2438 | } | |
2439 | ||
2440 | /* Eliminate indirect cycles involving NODE. Return true if NODE was | |
2441 | part of an SCC, false otherwise. */ | |
2442 | ||
2443 | static bool | |
2444 | eliminate_indirect_cycles (unsigned int node) | |
2445 | { | |
2446 | if (graph->indirect_cycles[node] != -1 | |
2447 | && !bitmap_empty_p (get_varinfo (node)->solution)) | |
2448 | { | |
2449 | unsigned int i; | |
2450 | VEC(unsigned,heap) *queue = NULL; | |
2451 | int queuepos; | |
2452 | unsigned int to = find (graph->indirect_cycles[node]); | |
2453 | bitmap_iterator bi; | |
2454 | ||
2455 | /* We can't touch the solution set and call unify_nodes | |
2456 | at the same time, because unify_nodes is going to do | |
2457 | bitmap unions into it. */ | |
2458 | ||
2459 | EXECUTE_IF_SET_IN_BITMAP (get_varinfo (node)->solution, 0, i, bi) | |
2460 | { | |
2461 | if (find (i) == i && i != to) | |
2462 | { | |
2463 | if (unite (to, i)) | |
2464 | VEC_safe_push (unsigned, heap, queue, i); | |
2465 | } | |
2466 | } | |
2467 | ||
2468 | for (queuepos = 0; | |
2469 | VEC_iterate (unsigned, queue, queuepos, i); | |
2470 | queuepos++) | |
2471 | { | |
2472 | unify_nodes (graph, to, i, true); | |
2473 | } | |
2474 | VEC_free (unsigned, heap, queue); | |
2475 | return true; | |
2476 | } | |
2477 | return false; | |
910fdc79 DB |
2478 | } |
2479 | ||
910fdc79 DB |
2480 | /* Solve the constraint graph GRAPH using our worklist solver. |
2481 | This is based on the PW* family of solvers from the "Efficient Field | |
2482 | Sensitive Pointer Analysis for C" paper. | |
2483 | It works by iterating over all the graph nodes, processing the complex | |
2484 | constraints and propagating the copy constraints, until everything stops | |
2485 | changed. This corresponds to steps 6-8 in the solving list given above. */ | |
2486 | ||
2487 | static void | |
2488 | solve_graph (constraint_graph_t graph) | |
2489 | { | |
7b765bed | 2490 | unsigned int size = graph->size; |
910fdc79 | 2491 | unsigned int i; |
3e5937d7 | 2492 | bitmap pts; |
910fdc79 | 2493 | |
648b5f85 | 2494 | changed = BITMAP_ALLOC (NULL); |
c58936b6 | 2495 | |
3e5937d7 | 2496 | /* Mark all initial non-collapsed nodes as changed. */ |
910fdc79 | 2497 | for (i = 0; i < size; i++) |
3e5937d7 DB |
2498 | { |
2499 | varinfo_t ivi = get_varinfo (i); | |
2500 | if (find (i) == i && !bitmap_empty_p (ivi->solution) | |
2501 | && ((graph->succs[i] && !bitmap_empty_p (graph->succs[i])) | |
2502 | || VEC_length (constraint_t, graph->complex[i]) > 0)) | |
648b5f85 | 2503 | bitmap_set_bit (changed, i); |
3e5937d7 DB |
2504 | } |
2505 | ||
2506 | /* Allocate a bitmap to be used to store the changed bits. */ | |
2507 | pts = BITMAP_ALLOC (&pta_obstack); | |
c58936b6 | 2508 | |
648b5f85 | 2509 | while (!bitmap_empty_p (changed)) |
910fdc79 DB |
2510 | { |
2511 | unsigned int i; | |
2512 | struct topo_info *ti = init_topo_info (); | |
2513 | stats.iterations++; | |
4ee00913 | 2514 | |
910fdc79 | 2515 | bitmap_obstack_initialize (&iteration_obstack); |
c58936b6 | 2516 | |
910fdc79 DB |
2517 | compute_topo_order (graph, ti); |
2518 | ||
740e80e8 | 2519 | while (VEC_length (unsigned, ti->topo_order) != 0) |
910fdc79 | 2520 | { |
3e5937d7 | 2521 | |
740e80e8 | 2522 | i = VEC_pop (unsigned, ti->topo_order); |
3e5937d7 DB |
2523 | |
2524 | /* If this variable is not a representative, skip it. */ | |
2525 | if (find (i) != i) | |
2526 | continue; | |
2527 | ||
d3c36974 DB |
2528 | /* In certain indirect cycle cases, we may merge this |
2529 | variable to another. */ | |
62e5bf5d | 2530 | if (eliminate_indirect_cycles (i) && find (i) != i) |
d3c36974 | 2531 | continue; |
910fdc79 DB |
2532 | |
2533 | /* If the node has changed, we need to process the | |
2534 | complex constraints and outgoing edges again. */ | |
648b5f85 | 2535 | if (bitmap_clear_bit (changed, i)) |
910fdc79 DB |
2536 | { |
2537 | unsigned int j; | |
2538 | constraint_t c; | |
910fdc79 | 2539 | bitmap solution; |
3e5937d7 | 2540 | VEC(constraint_t,heap) *complex = graph->complex[i]; |
74d8fa44 | 2541 | varinfo_t vi = get_varinfo (i); |
21392f19 | 2542 | bool solution_empty; |
48e540b0 | 2543 | |
3e5937d7 | 2544 | /* Compute the changed set of solution bits. */ |
74d8fa44 RG |
2545 | if (vi->oldsolution) |
2546 | bitmap_and_compl (pts, vi->solution, vi->oldsolution); | |
2547 | else | |
2548 | bitmap_copy (pts, vi->solution); | |
3e5937d7 DB |
2549 | |
2550 | if (bitmap_empty_p (pts)) | |
2551 | continue; | |
2552 | ||
74d8fa44 RG |
2553 | if (vi->oldsolution) |
2554 | bitmap_ior_into (vi->oldsolution, pts); | |
2555 | else | |
2556 | { | |
2557 | vi->oldsolution = BITMAP_ALLOC (&oldpta_obstack); | |
2558 | bitmap_copy (vi->oldsolution, pts); | |
2559 | } | |
3e5937d7 | 2560 | |
74d8fa44 | 2561 | solution = vi->solution; |
21392f19 DB |
2562 | solution_empty = bitmap_empty_p (solution); |
2563 | ||
2564 | /* Process the complex constraints */ | |
ac47786e | 2565 | FOR_EACH_VEC_ELT (constraint_t, complex, j, c) |
21392f19 | 2566 | { |
7b765bed DB |
2567 | /* XXX: This is going to unsort the constraints in |
2568 | some cases, which will occasionally add duplicate | |
2569 | constraints during unification. This does not | |
2570 | affect correctness. */ | |
2571 | c->lhs.var = find (c->lhs.var); | |
2572 | c->rhs.var = find (c->rhs.var); | |
2573 | ||
21392f19 DB |
2574 | /* The only complex constraint that can change our |
2575 | solution to non-empty, given an empty solution, | |
2576 | is a constraint where the lhs side is receiving | |
2577 | some set from elsewhere. */ | |
2578 | if (!solution_empty || c->lhs.type != DEREF) | |
3e5937d7 | 2579 | do_complex_constraint (graph, c, pts); |
21392f19 | 2580 | } |
910fdc79 | 2581 | |
21392f19 DB |
2582 | solution_empty = bitmap_empty_p (solution); |
2583 | ||
5006671f | 2584 | if (!solution_empty) |
4ee00913 | 2585 | { |
3e5937d7 | 2586 | bitmap_iterator bi; |
5006671f | 2587 | unsigned eff_escaped_id = find (escaped_id); |
3e5937d7 | 2588 | |
21392f19 | 2589 | /* Propagate solution to all successors. */ |
c58936b6 | 2590 | EXECUTE_IF_IN_NONNULL_BITMAP (graph->succs[i], |
21392f19 | 2591 | 0, j, bi) |
4ee00913 | 2592 | { |
3e5937d7 DB |
2593 | bitmap tmp; |
2594 | bool flag; | |
2595 | ||
2596 | unsigned int to = find (j); | |
2597 | tmp = get_varinfo (to)->solution; | |
2598 | flag = false; | |
c58936b6 | 2599 | |
3e5937d7 DB |
2600 | /* Don't try to propagate to ourselves. */ |
2601 | if (to == i) | |
2602 | continue; | |
c58936b6 | 2603 | |
5006671f RG |
2604 | /* If we propagate from ESCAPED use ESCAPED as |
2605 | placeholder. */ | |
2606 | if (i == eff_escaped_id) | |
2607 | flag = bitmap_set_bit (tmp, escaped_id); | |
2608 | else | |
2609 | flag = set_union_with_increment (tmp, pts, 0); | |
c58936b6 | 2610 | |
21392f19 | 2611 | if (flag) |
4ee00913 | 2612 | { |
3e5937d7 | 2613 | get_varinfo (to)->solution = tmp; |
648b5f85 | 2614 | bitmap_set_bit (changed, to); |
4ee00913 DB |
2615 | } |
2616 | } | |
910fdc79 DB |
2617 | } |
2618 | } | |
2619 | } | |
2620 | free_topo_info (ti); | |
2621 | bitmap_obstack_release (&iteration_obstack); | |
2622 | } | |
c58936b6 | 2623 | |
3e5937d7 | 2624 | BITMAP_FREE (pts); |
648b5f85 | 2625 | BITMAP_FREE (changed); |
3e5937d7 | 2626 | bitmap_obstack_release (&oldpta_obstack); |
910fdc79 DB |
2627 | } |
2628 | ||
3e5937d7 | 2629 | /* Map from trees to variable infos. */ |
15814ba0 | 2630 | static struct pointer_map_t *vi_for_tree; |
910fdc79 | 2631 | |
910fdc79 | 2632 | |
15814ba0 | 2633 | /* Insert ID as the variable id for tree T in the vi_for_tree map. */ |
910fdc79 | 2634 | |
c58936b6 | 2635 | static void |
3e5937d7 | 2636 | insert_vi_for_tree (tree t, varinfo_t vi) |
910fdc79 | 2637 | { |
15814ba0 PB |
2638 | void **slot = pointer_map_insert (vi_for_tree, t); |
2639 | gcc_assert (vi); | |
910fdc79 | 2640 | gcc_assert (*slot == NULL); |
15814ba0 | 2641 | *slot = vi; |
910fdc79 DB |
2642 | } |
2643 | ||
3e5937d7 | 2644 | /* Find the variable info for tree T in VI_FOR_TREE. If T does not |
15814ba0 | 2645 | exist in the map, return NULL, otherwise, return the varinfo we found. */ |
910fdc79 | 2646 | |
15814ba0 PB |
2647 | static varinfo_t |
2648 | lookup_vi_for_tree (tree t) | |
910fdc79 | 2649 | { |
15814ba0 PB |
2650 | void **slot = pointer_map_contains (vi_for_tree, t); |
2651 | if (slot == NULL) | |
2652 | return NULL; | |
910fdc79 | 2653 | |
15814ba0 | 2654 | return (varinfo_t) *slot; |
910fdc79 DB |
2655 | } |
2656 | ||
2657 | /* Return a printable name for DECL */ | |
2658 | ||
2659 | static const char * | |
2660 | alias_get_name (tree decl) | |
2661 | { | |
27c2cfa6 | 2662 | const char *res; |
910fdc79 DB |
2663 | char *temp; |
2664 | int num_printed = 0; | |
2665 | ||
27c2cfa6 RG |
2666 | if (DECL_ASSEMBLER_NAME_SET_P (decl)) |
2667 | res = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)); | |
2668 | else | |
2669 | res= get_name (decl); | |
910fdc79 DB |
2670 | if (res != NULL) |
2671 | return res; | |
2672 | ||
2673 | res = "NULL"; | |
4f6c9110 RG |
2674 | if (!dump_file) |
2675 | return res; | |
2676 | ||
910fdc79 DB |
2677 | if (TREE_CODE (decl) == SSA_NAME) |
2678 | { | |
c58936b6 | 2679 | num_printed = asprintf (&temp, "%s_%u", |
910fdc79 DB |
2680 | alias_get_name (SSA_NAME_VAR (decl)), |
2681 | SSA_NAME_VERSION (decl)); | |
2682 | } | |
2683 | else if (DECL_P (decl)) | |
2684 | { | |
2685 | num_printed = asprintf (&temp, "D.%u", DECL_UID (decl)); | |
2686 | } | |
2687 | if (num_printed > 0) | |
2688 | { | |
2689 | res = ggc_strdup (temp); | |
2690 | free (temp); | |
2691 | } | |
2692 | return res; | |
2693 | } | |
2694 | ||
15814ba0 PB |
2695 | /* Find the variable id for tree T in the map. |
2696 | If T doesn't exist in the map, create an entry for it and return it. */ | |
910fdc79 | 2697 | |
3e5937d7 DB |
2698 | static varinfo_t |
2699 | get_vi_for_tree (tree t) | |
910fdc79 | 2700 | { |
15814ba0 PB |
2701 | void **slot = pointer_map_contains (vi_for_tree, t); |
2702 | if (slot == NULL) | |
3e5937d7 | 2703 | return get_varinfo (create_variable_info_for (t, alias_get_name (t))); |
c58936b6 | 2704 | |
15814ba0 | 2705 | return (varinfo_t) *slot; |
910fdc79 DB |
2706 | } |
2707 | ||
b14e9388 | 2708 | /* Get a scalar constraint expression for a new temporary variable. */ |
910fdc79 DB |
2709 | |
2710 | static struct constraint_expr | |
b14e9388 | 2711 | new_scalar_tmp_constraint_exp (const char *name) |
910fdc79 | 2712 | { |
b14e9388 | 2713 | struct constraint_expr tmp; |
b14e9388 | 2714 | varinfo_t vi; |
910fdc79 | 2715 | |
0bbf2ffa | 2716 | vi = new_var_info (NULL_TREE, name); |
b14e9388 RG |
2717 | vi->offset = 0; |
2718 | vi->size = -1; | |
2719 | vi->fullsize = -1; | |
2720 | vi->is_full_var = 1; | |
c0d459f0 | 2721 | |
b14e9388 RG |
2722 | tmp.var = vi->id; |
2723 | tmp.type = SCALAR; | |
2724 | tmp.offset = 0; | |
c0d459f0 | 2725 | |
b14e9388 | 2726 | return tmp; |
c0d459f0 RG |
2727 | } |
2728 | ||
2729 | /* Get a constraint expression vector from an SSA_VAR_P node. | |
2730 | If address_p is true, the result will be taken its address of. */ | |
2731 | ||
2732 | static void | |
2733 | get_constraint_for_ssa_var (tree t, VEC(ce_s, heap) **results, bool address_p) | |
2734 | { | |
2735 | struct constraint_expr cexpr; | |
2736 | varinfo_t vi; | |
2737 | ||
2738 | /* We allow FUNCTION_DECLs here even though it doesn't make much sense. */ | |
b2ec94d4 | 2739 | gcc_assert (TREE_CODE (t) == SSA_NAME || DECL_P (t)); |
910fdc79 DB |
2740 | |
2741 | /* For parameters, get at the points-to set for the actual parm | |
2742 | decl. */ | |
c58936b6 | 2743 | if (TREE_CODE (t) == SSA_NAME |
b2ec94d4 | 2744 | && SSA_NAME_IS_DEFAULT_DEF (t) |
6938f93f | 2745 | && (TREE_CODE (SSA_NAME_VAR (t)) == PARM_DECL |
b2ec94d4 | 2746 | || TREE_CODE (SSA_NAME_VAR (t)) == RESULT_DECL)) |
c0d459f0 RG |
2747 | { |
2748 | get_constraint_for_ssa_var (SSA_NAME_VAR (t), results, address_p); | |
2749 | return; | |
2750 | } | |
910fdc79 | 2751 | |
9c7c9f10 RG |
2752 | /* For global variables resort to the alias target. */ |
2753 | if (TREE_CODE (t) == VAR_DECL | |
2754 | && (TREE_STATIC (t) || DECL_EXTERNAL (t))) | |
2755 | { | |
2756 | struct varpool_node *node = varpool_get_node (t); | |
2757 | if (node && node->alias) | |
2758 | { | |
2759 | node = varpool_variable_node (node, NULL); | |
960bfb69 | 2760 | t = node->symbol.decl; |
9c7c9f10 RG |
2761 | } |
2762 | } | |
2763 | ||
c0d459f0 RG |
2764 | vi = get_vi_for_tree (t); |
2765 | cexpr.var = vi->id; | |
910fdc79 | 2766 | cexpr.type = SCALAR; |
c0d459f0 | 2767 | cexpr.offset = 0; |
47bcb538 DB |
2768 | /* If we determine the result is "anything", and we know this is readonly, |
2769 | say it points to readonly memory instead. */ | |
2770 | if (cexpr.var == anything_id && TREE_READONLY (t)) | |
910fdc79 | 2771 | { |
c0d459f0 | 2772 | gcc_unreachable (); |
3e5937d7 | 2773 | cexpr.type = ADDRESSOF; |
910fdc79 DB |
2774 | cexpr.var = readonly_id; |
2775 | } | |
c58936b6 | 2776 | |
c0d459f0 RG |
2777 | /* If we are not taking the address of the constraint expr, add all |
2778 | sub-fiels of the variable as well. */ | |
de925a03 RG |
2779 | if (!address_p |
2780 | && !vi->is_full_var) | |
c0d459f0 RG |
2781 | { |
2782 | for (; vi; vi = vi->next) | |
2783 | { | |
2784 | cexpr.var = vi->id; | |
2785 | VEC_safe_push (ce_s, heap, *results, &cexpr); | |
2786 | } | |
2787 | return; | |
2788 | } | |
2789 | ||
2790 | VEC_safe_push (ce_s, heap, *results, &cexpr); | |
910fdc79 DB |
2791 | } |
2792 | ||
faf2ecc5 RG |
2793 | /* Process constraint T, performing various simplifications and then |
2794 | adding it to our list of overall constraints. */ | |
910fdc79 DB |
2795 | |
2796 | static void | |
faf2ecc5 | 2797 | process_constraint (constraint_t t) |
910fdc79 DB |
2798 | { |
2799 | struct constraint_expr rhs = t->rhs; | |
2800 | struct constraint_expr lhs = t->lhs; | |
c58936b6 | 2801 | |
910fdc79 DB |
2802 | gcc_assert (rhs.var < VEC_length (varinfo_t, varmap)); |
2803 | gcc_assert (lhs.var < VEC_length (varinfo_t, varmap)); | |
2804 | ||
5006671f RG |
2805 | /* If we didn't get any useful constraint from the lhs we get |
2806 | &ANYTHING as fallback from get_constraint_for. Deal with | |
2807 | it here by turning it into *ANYTHING. */ | |
2808 | if (lhs.type == ADDRESSOF | |
2809 | && lhs.var == anything_id) | |
2810 | lhs.type = DEREF; | |
2811 | ||
2812 | /* ADDRESSOF on the lhs is invalid. */ | |
2813 | gcc_assert (lhs.type != ADDRESSOF); | |
910fdc79 | 2814 | |
3c323b52 RG |
2815 | /* We shouldn't add constraints from things that cannot have pointers. |
2816 | It's not completely trivial to avoid in the callers, so do it here. */ | |
2817 | if (rhs.type != ADDRESSOF | |
2818 | && !get_varinfo (rhs.var)->may_have_pointers) | |
2819 | return; | |
2820 | ||
2821 | /* Likewise adding to the solution of a non-pointer var isn't useful. */ | |
2822 | if (!get_varinfo (lhs.var)->may_have_pointers) | |
2823 | return; | |
2824 | ||
910fdc79 | 2825 | /* This can happen in our IR with things like n->a = *p */ |
5006671f | 2826 | if (rhs.type == DEREF && lhs.type == DEREF && rhs.var != anything_id) |
910fdc79 DB |
2827 | { |
2828 | /* Split into tmp = *rhs, *lhs = tmp */ | |
b14e9388 RG |
2829 | struct constraint_expr tmplhs; |
2830 | tmplhs = new_scalar_tmp_constraint_exp ("doubledereftmp"); | |
faf2ecc5 RG |
2831 | process_constraint (new_constraint (tmplhs, rhs)); |
2832 | process_constraint (new_constraint (lhs, tmplhs)); | |
7b765bed DB |
2833 | } |
2834 | else if (rhs.type == ADDRESSOF && lhs.type == DEREF) | |
2835 | { | |
2836 | /* Split into tmp = &rhs, *lhs = tmp */ | |
b14e9388 RG |
2837 | struct constraint_expr tmplhs; |
2838 | tmplhs = new_scalar_tmp_constraint_exp ("derefaddrtmp"); | |
faf2ecc5 RG |
2839 | process_constraint (new_constraint (tmplhs, rhs)); |
2840 | process_constraint (new_constraint (lhs, tmplhs)); | |
910fdc79 | 2841 | } |
910fdc79 DB |
2842 | else |
2843 | { | |
3e5937d7 | 2844 | gcc_assert (rhs.type != ADDRESSOF || rhs.offset == 0); |
b5efa470 | 2845 | VEC_safe_push (constraint_t, heap, constraints, t); |
910fdc79 DB |
2846 | } |
2847 | } | |
2848 | ||
2849 | ||
2850 | /* Return the position, in bits, of FIELD_DECL from the beginning of its | |
2851 | structure. */ | |
2852 | ||
ee7d4b57 | 2853 | static HOST_WIDE_INT |
910fdc79 DB |
2854 | bitpos_of_field (const tree fdecl) |
2855 | { | |
ee7d4b57 RG |
2856 | if (!host_integerp (DECL_FIELD_OFFSET (fdecl), 0) |
2857 | || !host_integerp (DECL_FIELD_BIT_OFFSET (fdecl), 0)) | |
910fdc79 | 2858 | return -1; |
c58936b6 | 2859 | |
ea57f573 | 2860 | return (TREE_INT_CST_LOW (DECL_FIELD_OFFSET (fdecl)) * BITS_PER_UNIT |
ee7d4b57 | 2861 | + TREE_INT_CST_LOW (DECL_FIELD_BIT_OFFSET (fdecl))); |
910fdc79 DB |
2862 | } |
2863 | ||
2864 | ||
e5bae89b RG |
2865 | /* Get constraint expressions for offsetting PTR by OFFSET. Stores the |
2866 | resulting constraint expressions in *RESULTS. */ | |
2867 | ||
2868 | static void | |
2869 | get_constraint_for_ptr_offset (tree ptr, tree offset, | |
2870 | VEC (ce_s, heap) **results) | |
2871 | { | |
bd02b3a0 | 2872 | struct constraint_expr c; |
e5bae89b | 2873 | unsigned int j, n; |
97919ae7 | 2874 | HOST_WIDE_INT rhsoffset; |
e5bae89b RG |
2875 | |
2876 | /* If we do not do field-sensitive PTA adding offsets to pointers | |
2877 | does not change the points-to solution. */ | |
2878 | if (!use_field_sensitive) | |
2879 | { | |
ed6c4831 | 2880 | get_constraint_for_rhs (ptr, results); |
e5bae89b RG |
2881 | return; |
2882 | } | |
2883 | ||
2884 | /* If the offset is not a non-negative integer constant that fits | |
2885 | in a HOST_WIDE_INT, we have to fall back to a conservative | |
2886 | solution which includes all sub-fields of all pointed-to | |
5006671f | 2887 | variables of ptr. */ |
779704e7 | 2888 | if (offset == NULL_TREE |
97919ae7 | 2889 | || TREE_CODE (offset) != INTEGER_CST) |
5006671f RG |
2890 | rhsoffset = UNKNOWN_OFFSET; |
2891 | else | |
e5bae89b | 2892 | { |
97919ae7 RG |
2893 | /* Sign-extend the offset. */ |
2894 | double_int soffset | |
2895 | = double_int_sext (tree_to_double_int (offset), | |
2896 | TYPE_PRECISION (TREE_TYPE (offset))); | |
2897 | if (!double_int_fits_in_shwi_p (soffset)) | |
5006671f | 2898 | rhsoffset = UNKNOWN_OFFSET; |
97919ae7 RG |
2899 | else |
2900 | { | |
2901 | /* Make sure the bit-offset also fits. */ | |
2902 | HOST_WIDE_INT rhsunitoffset = soffset.low; | |
2903 | rhsoffset = rhsunitoffset * BITS_PER_UNIT; | |
2904 | if (rhsunitoffset != rhsoffset / BITS_PER_UNIT) | |
2905 | rhsoffset = UNKNOWN_OFFSET; | |
2906 | } | |
e5bae89b RG |
2907 | } |
2908 | ||
ed6c4831 | 2909 | get_constraint_for_rhs (ptr, results); |
e5bae89b RG |
2910 | if (rhsoffset == 0) |
2911 | return; | |
2912 | ||
2913 | /* As we are eventually appending to the solution do not use | |
2914 | VEC_iterate here. */ | |
2915 | n = VEC_length (ce_s, *results); | |
2916 | for (j = 0; j < n; j++) | |
2917 | { | |
2918 | varinfo_t curr; | |
bd02b3a0 RG |
2919 | c = *VEC_index (ce_s, *results, j); |
2920 | curr = get_varinfo (c.var); | |
e5bae89b | 2921 | |
bd02b3a0 | 2922 | if (c.type == ADDRESSOF |
5006671f RG |
2923 | /* If this varinfo represents a full variable just use it. */ |
2924 | && curr->is_full_var) | |
bd02b3a0 RG |
2925 | c.offset = 0; |
2926 | else if (c.type == ADDRESSOF | |
5006671f RG |
2927 | /* If we do not know the offset add all subfields. */ |
2928 | && rhsoffset == UNKNOWN_OFFSET) | |
2929 | { | |
2930 | varinfo_t temp = lookup_vi_for_tree (curr->decl); | |
2931 | do | |
2932 | { | |
2933 | struct constraint_expr c2; | |
2934 | c2.var = temp->id; | |
2935 | c2.type = ADDRESSOF; | |
2936 | c2.offset = 0; | |
bd02b3a0 | 2937 | if (c2.var != c.var) |
779704e7 | 2938 | VEC_safe_push (ce_s, heap, *results, &c2); |
5006671f RG |
2939 | temp = temp->next; |
2940 | } | |
2941 | while (temp); | |
2942 | } | |
bd02b3a0 | 2943 | else if (c.type == ADDRESSOF) |
e5bae89b | 2944 | { |
5006671f RG |
2945 | varinfo_t temp; |
2946 | unsigned HOST_WIDE_INT offset = curr->offset + rhsoffset; | |
e5bae89b RG |
2947 | |
2948 | /* Search the sub-field which overlaps with the | |
5006671f RG |
2949 | pointed-to offset. If the result is outside of the variable |
2950 | we have to provide a conservative result, as the variable is | |
2951 | still reachable from the resulting pointer (even though it | |
2952 | technically cannot point to anything). The last and first | |
2953 | sub-fields are such conservative results. | |
e5bae89b RG |
2954 | ??? If we always had a sub-field for &object + 1 then |
2955 | we could represent this in a more precise way. */ | |
5006671f RG |
2956 | if (rhsoffset < 0 |
2957 | && curr->offset < offset) | |
2958 | offset = 0; | |
2959 | temp = first_or_preceding_vi_for_offset (curr, offset); | |
e5bae89b RG |
2960 | |
2961 | /* If the found variable is not exactly at the pointed to | |
2962 | result, we have to include the next variable in the | |
2963 | solution as well. Otherwise two increments by offset / 2 | |
2964 | do not result in the same or a conservative superset | |
2965 | solution. */ | |
5006671f | 2966 | if (temp->offset != offset |
e5bae89b RG |
2967 | && temp->next != NULL) |
2968 | { | |
2969 | struct constraint_expr c2; | |
2970 | c2.var = temp->next->id; | |
2971 | c2.type = ADDRESSOF; | |
2972 | c2.offset = 0; | |
2973 | VEC_safe_push (ce_s, heap, *results, &c2); | |
2974 | } | |
bd02b3a0 RG |
2975 | c.var = temp->id; |
2976 | c.offset = 0; | |
e5bae89b | 2977 | } |
e5bae89b | 2978 | else |
bd02b3a0 RG |
2979 | c.offset = rhsoffset; |
2980 | ||
2981 | VEC_replace (ce_s, *results, j, &c); | |
e5bae89b RG |
2982 | } |
2983 | } | |
2984 | ||
2985 | ||
c0d459f0 | 2986 | /* Given a COMPONENT_REF T, return the constraint_expr vector for it. |
ed6c4831 RG |
2987 | If address_p is true the result will be taken its address of. |
2988 | If lhs_p is true then the constraint expression is assumed to be used | |
2989 | as the lhs. */ | |
910fdc79 | 2990 | |
4ee00913 | 2991 | static void |
c0d459f0 | 2992 | get_constraint_for_component_ref (tree t, VEC(ce_s, heap) **results, |
ed6c4831 | 2993 | bool address_p, bool lhs_p) |
910fdc79 | 2994 | { |
4ee00913 | 2995 | tree orig_t = t; |
b1347638 | 2996 | HOST_WIDE_INT bitsize = -1; |
6bec9271 | 2997 | HOST_WIDE_INT bitmaxsize = -1; |
910fdc79 | 2998 | HOST_WIDE_INT bitpos; |
910fdc79 | 2999 | tree forzero; |
4ee00913 | 3000 | struct constraint_expr *result; |
910fdc79 DB |
3001 | |
3002 | /* Some people like to do cute things like take the address of | |
3003 | &0->a.b */ | |
3004 | forzero = t; | |
2ea9dc64 | 3005 | while (handled_component_p (forzero) |
70f34814 RG |
3006 | || INDIRECT_REF_P (forzero) |
3007 | || TREE_CODE (forzero) == MEM_REF) | |
4ee00913 | 3008 | forzero = TREE_OPERAND (forzero, 0); |
910fdc79 | 3009 | |
c58936b6 | 3010 | if (CONSTANT_CLASS_P (forzero) && integer_zerop (forzero)) |
910fdc79 | 3011 | { |
4ee00913 | 3012 | struct constraint_expr temp; |
c58936b6 | 3013 | |
4ee00913 DB |
3014 | temp.offset = 0; |
3015 | temp.var = integer_id; | |
3016 | temp.type = SCALAR; | |
3017 | VEC_safe_push (ce_s, heap, *results, &temp); | |
3018 | return; | |
910fdc79 | 3019 | } |
c58936b6 | 3020 | |
ed6c4831 RG |
3021 | /* Handle type-punning through unions. If we are extracting a pointer |
3022 | from a union via a possibly type-punning access that pointer | |
3023 | points to anything, similar to a conversion of an integer to | |
3024 | a pointer. */ | |
3025 | if (!lhs_p) | |
3026 | { | |
3027 | tree u; | |
3028 | for (u = t; | |
3029 | TREE_CODE (u) == COMPONENT_REF || TREE_CODE (u) == ARRAY_REF; | |
3030 | u = TREE_OPERAND (u, 0)) | |
3031 | if (TREE_CODE (u) == COMPONENT_REF | |
3032 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (u, 0))) == UNION_TYPE) | |
3033 | { | |
3034 | struct constraint_expr temp; | |
3035 | ||
3036 | temp.offset = 0; | |
3037 | temp.var = anything_id; | |
3038 | temp.type = ADDRESSOF; | |
3039 | VEC_safe_push (ce_s, heap, *results, &temp); | |
3040 | return; | |
3041 | } | |
3042 | } | |
3043 | ||
6bec9271 | 3044 | t = get_ref_base_and_extent (t, &bitpos, &bitsize, &bitmaxsize); |
21392f19 | 3045 | |
c0d459f0 RG |
3046 | /* Pretend to take the address of the base, we'll take care of |
3047 | adding the required subset of sub-fields below. */ | |
ed6c4831 | 3048 | get_constraint_for_1 (t, results, true, lhs_p); |
c0d459f0 | 3049 | gcc_assert (VEC_length (ce_s, *results) == 1); |
e5bae89b | 3050 | result = VEC_last (ce_s, *results); |
910fdc79 | 3051 | |
e5bae89b RG |
3052 | if (result->type == SCALAR |
3053 | && get_varinfo (result->var)->is_full_var) | |
3054 | /* For single-field vars do not bother about the offset. */ | |
3055 | result->offset = 0; | |
3056 | else if (result->type == SCALAR) | |
910fdc79 DB |
3057 | { |
3058 | /* In languages like C, you can access one past the end of an | |
3059 | array. You aren't allowed to dereference it, so we can | |
3060 | ignore this constraint. When we handle pointer subtraction, | |
3061 | we may have to do something cute here. */ | |
c58936b6 | 3062 | |
c0d459f0 | 3063 | if ((unsigned HOST_WIDE_INT)bitpos < get_varinfo (result->var)->fullsize |
18455d17 | 3064 | && bitmaxsize != 0) |
dd68d988 DB |
3065 | { |
3066 | /* It's also not true that the constraint will actually start at the | |
3067 | right offset, it may start in some padding. We only care about | |
3068 | setting the constraint to the first actual field it touches, so | |
c58936b6 | 3069 | walk to find it. */ |
c0d459f0 | 3070 | struct constraint_expr cexpr = *result; |
dd68d988 | 3071 | varinfo_t curr; |
c0d459f0 RG |
3072 | VEC_pop (ce_s, *results); |
3073 | cexpr.offset = 0; | |
3074 | for (curr = get_varinfo (cexpr.var); curr; curr = curr->next) | |
dd68d988 | 3075 | { |
63d195d5 | 3076 | if (ranges_overlap_p (curr->offset, curr->size, |
c0d459f0 | 3077 | bitpos, bitmaxsize)) |
dd68d988 | 3078 | { |
c0d459f0 RG |
3079 | cexpr.var = curr->id; |
3080 | VEC_safe_push (ce_s, heap, *results, &cexpr); | |
3081 | if (address_p) | |
3082 | break; | |
dd68d988 DB |
3083 | } |
3084 | } | |
e5bae89b RG |
3085 | /* If we are going to take the address of this field then |
3086 | to be able to compute reachability correctly add at least | |
3087 | the last field of the variable. */ | |
3088 | if (address_p | |
3089 | && VEC_length (ce_s, *results) == 0) | |
3090 | { | |
3091 | curr = get_varinfo (cexpr.var); | |
3092 | while (curr->next != NULL) | |
3093 | curr = curr->next; | |
3094 | cexpr.var = curr->id; | |
3095 | VEC_safe_push (ce_s, heap, *results, &cexpr); | |
3096 | } | |
0ba0772b | 3097 | else if (VEC_length (ce_s, *results) == 0) |
e5bae89b RG |
3098 | /* Assert that we found *some* field there. The user couldn't be |
3099 | accessing *only* padding. */ | |
3100 | /* Still the user could access one past the end of an array | |
3101 | embedded in a struct resulting in accessing *only* padding. */ | |
0ba0772b RB |
3102 | /* Or accessing only padding via type-punning to a type |
3103 | that has a filed just in padding space. */ | |
3104 | { | |
3105 | cexpr.type = SCALAR; | |
3106 | cexpr.var = anything_id; | |
3107 | cexpr.offset = 0; | |
3108 | VEC_safe_push (ce_s, heap, *results, &cexpr); | |
3109 | } | |
dd68d988 | 3110 | } |
18455d17 RG |
3111 | else if (bitmaxsize == 0) |
3112 | { | |
3113 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
3114 | fprintf (dump_file, "Access to zero-sized part of variable," | |
3115 | "ignoring\n"); | |
3116 | } | |
910fdc79 DB |
3117 | else |
3118 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
3119 | fprintf (dump_file, "Access to past the end of variable, ignoring\n"); | |
910fdc79 | 3120 | } |
5006671f | 3121 | else if (result->type == DEREF) |
7b765bed | 3122 | { |
5006671f RG |
3123 | /* If we do not know exactly where the access goes say so. Note |
3124 | that only for non-structure accesses we know that we access | |
3125 | at most one subfiled of any variable. */ | |
3126 | if (bitpos == -1 | |
3127 | || bitsize != bitmaxsize | |
1c09321c RG |
3128 | || AGGREGATE_TYPE_P (TREE_TYPE (orig_t)) |
3129 | || result->offset == UNKNOWN_OFFSET) | |
5006671f RG |
3130 | result->offset = UNKNOWN_OFFSET; |
3131 | else | |
1c09321c | 3132 | result->offset += bitpos; |
7b765bed | 3133 | } |
b51605c4 RG |
3134 | else if (result->type == ADDRESSOF) |
3135 | { | |
3136 | /* We can end up here for component references on a | |
3137 | VIEW_CONVERT_EXPR <>(&foobar). */ | |
3138 | result->type = SCALAR; | |
3139 | result->var = anything_id; | |
3140 | result->offset = 0; | |
3141 | } | |
c0d459f0 | 3142 | else |
5006671f | 3143 | gcc_unreachable (); |
910fdc79 DB |
3144 | } |
3145 | ||
3146 | ||
3147 | /* Dereference the constraint expression CONS, and return the result. | |
3148 | DEREF (ADDRESSOF) = SCALAR | |
3149 | DEREF (SCALAR) = DEREF | |
3150 | DEREF (DEREF) = (temp = DEREF1; result = DEREF(temp)) | |
3151 | This is needed so that we can handle dereferencing DEREF constraints. */ | |
3152 | ||
4ee00913 DB |
3153 | static void |
3154 | do_deref (VEC (ce_s, heap) **constraints) | |
910fdc79 | 3155 | { |
4ee00913 DB |
3156 | struct constraint_expr *c; |
3157 | unsigned int i = 0; | |
c58936b6 | 3158 | |
ac47786e | 3159 | FOR_EACH_VEC_ELT (ce_s, *constraints, i, c) |
910fdc79 | 3160 | { |
4ee00913 DB |
3161 | if (c->type == SCALAR) |
3162 | c->type = DEREF; | |
3163 | else if (c->type == ADDRESSOF) | |
3164 | c->type = SCALAR; | |
3165 | else if (c->type == DEREF) | |
3166 | { | |
b14e9388 RG |
3167 | struct constraint_expr tmplhs; |
3168 | tmplhs = new_scalar_tmp_constraint_exp ("dereftmp"); | |
4ee00913 DB |
3169 | process_constraint (new_constraint (tmplhs, *c)); |
3170 | c->var = tmplhs.var; | |
3171 | } | |
3172 | else | |
3173 | gcc_unreachable (); | |
910fdc79 | 3174 | } |
910fdc79 DB |
3175 | } |
3176 | ||
1d24fdd9 RG |
3177 | /* Given a tree T, return the constraint expression for taking the |
3178 | address of it. */ | |
3179 | ||
3180 | static void | |
3181 | get_constraint_for_address_of (tree t, VEC (ce_s, heap) **results) | |
3182 | { | |
3183 | struct constraint_expr *c; | |
3184 | unsigned int i; | |
3185 | ||
ed6c4831 | 3186 | get_constraint_for_1 (t, results, true, true); |
1d24fdd9 | 3187 | |
ac47786e | 3188 | FOR_EACH_VEC_ELT (ce_s, *results, i, c) |
1d24fdd9 RG |
3189 | { |
3190 | if (c->type == DEREF) | |
3191 | c->type = SCALAR; | |
3192 | else | |
3193 | c->type = ADDRESSOF; | |
3194 | } | |
3195 | } | |
3196 | ||
910fdc79 DB |
3197 | /* Given a tree T, return the constraint expression for it. */ |
3198 | ||
4ee00913 | 3199 | static void |
ed6c4831 RG |
3200 | get_constraint_for_1 (tree t, VEC (ce_s, heap) **results, bool address_p, |
3201 | bool lhs_p) | |
910fdc79 DB |
3202 | { |
3203 | struct constraint_expr temp; | |
3204 | ||
3205 | /* x = integer is all glommed to a single variable, which doesn't | |
3206 | point to anything by itself. That is, of course, unless it is an | |
3207 | integer constant being treated as a pointer, in which case, we | |
3208 | will return that this is really the addressof anything. This | |
3209 | happens below, since it will fall into the default case. The only | |
3210 | case we know something about an integer treated like a pointer is | |
3211 | when it is the NULL pointer, and then we just say it points to | |
89ebafc6 PB |
3212 | NULL. |
3213 | ||
3214 | Do not do that if -fno-delete-null-pointer-checks though, because | |
3215 | in that case *NULL does not fail, so it _should_ alias *anything. | |
3216 | It is not worth adding a new option or renaming the existing one, | |
3217 | since this case is relatively obscure. */ | |
8eb7bc3c RG |
3218 | if ((TREE_CODE (t) == INTEGER_CST |
3219 | && integer_zerop (t)) | |
3220 | /* The only valid CONSTRUCTORs in gimple with pointer typed | |
3221 | elements are zero-initializer. But in IPA mode we also | |
3222 | process global initializers, so verify at least. */ | |
3223 | || (TREE_CODE (t) == CONSTRUCTOR | |
3224 | && CONSTRUCTOR_NELTS (t) == 0)) | |
3225 | { | |
3226 | if (flag_delete_null_pointer_checks) | |
3227 | temp.var = nothing_id; | |
3228 | else | |
1f181fde | 3229 | temp.var = nonlocal_id; |
910fdc79 DB |
3230 | temp.type = ADDRESSOF; |
3231 | temp.offset = 0; | |
4ee00913 DB |
3232 | VEC_safe_push (ce_s, heap, *results, &temp); |
3233 | return; | |
910fdc79 DB |
3234 | } |
3235 | ||
bd1f29d9 EB |
3236 | /* String constants are read-only. */ |
3237 | if (TREE_CODE (t) == STRING_CST) | |
3238 | { | |
3239 | temp.var = readonly_id; | |
3240 | temp.type = SCALAR; | |
3241 | temp.offset = 0; | |
3242 | VEC_safe_push (ce_s, heap, *results, &temp); | |
3243 | return; | |
3244 | } | |
3245 | ||
910fdc79 DB |
3246 | switch (TREE_CODE_CLASS (TREE_CODE (t))) |
3247 | { | |
3248 | case tcc_expression: | |
3249 | { | |
3250 | switch (TREE_CODE (t)) | |
3251 | { | |
3252 | case ADDR_EXPR: | |
1d24fdd9 RG |
3253 | get_constraint_for_address_of (TREE_OPERAND (t, 0), results); |
3254 | return; | |
e5bae89b | 3255 | default:; |
910fdc79 | 3256 | } |
e5bae89b | 3257 | break; |
910fdc79 DB |
3258 | } |
3259 | case tcc_reference: | |
3260 | { | |
3261 | switch (TREE_CODE (t)) | |
3262 | { | |
70f34814 | 3263 | case MEM_REF: |
910fdc79 | 3264 | { |
de2184c0 | 3265 | struct constraint_expr cs; |
343b2efc | 3266 | varinfo_t vi, curr; |
97919ae7 RG |
3267 | get_constraint_for_ptr_offset (TREE_OPERAND (t, 0), |
3268 | TREE_OPERAND (t, 1), results); | |
4ee00913 | 3269 | do_deref (results); |
343b2efc RG |
3270 | |
3271 | /* If we are not taking the address then make sure to process | |
3272 | all subvariables we might access. */ | |
1a5d20a4 RG |
3273 | if (address_p) |
3274 | return; | |
3275 | ||
de2184c0 | 3276 | cs = *VEC_last (ce_s, *results); |
b4cf8c9d RG |
3277 | if (cs.type == DEREF |
3278 | && type_can_have_subvars (TREE_TYPE (t))) | |
1a5d20a4 RG |
3279 | { |
3280 | /* For dereferences this means we have to defer it | |
3281 | to solving time. */ | |
3282 | VEC_last (ce_s, *results)->offset = UNKNOWN_OFFSET; | |
3283 | return; | |
3284 | } | |
3285 | if (cs.type != SCALAR) | |
343b2efc RG |
3286 | return; |
3287 | ||
de2184c0 | 3288 | vi = get_varinfo (cs.var); |
343b2efc RG |
3289 | curr = vi->next; |
3290 | if (!vi->is_full_var | |
3291 | && curr) | |
3292 | { | |
3293 | unsigned HOST_WIDE_INT size; | |
3294 | if (host_integerp (TYPE_SIZE (TREE_TYPE (t)), 1)) | |
3295 | size = TREE_INT_CST_LOW (TYPE_SIZE (TREE_TYPE (t))); | |
3296 | else | |
3297 | size = -1; | |
3298 | for (; curr; curr = curr->next) | |
3299 | { | |
3300 | if (curr->offset - vi->offset < size) | |
3301 | { | |
343b2efc RG |
3302 | cs.var = curr->id; |
3303 | VEC_safe_push (ce_s, heap, *results, &cs); | |
3304 | } | |
3305 | else | |
3306 | break; | |
3307 | } | |
3308 | } | |
4ee00913 | 3309 | return; |
910fdc79 DB |
3310 | } |
3311 | case ARRAY_REF: | |
32961db5 | 3312 | case ARRAY_RANGE_REF: |
910fdc79 | 3313 | case COMPONENT_REF: |
ed6c4831 | 3314 | get_constraint_for_component_ref (t, results, address_p, lhs_p); |
4ee00913 | 3315 | return; |
5006671f | 3316 | case VIEW_CONVERT_EXPR: |
ed6c4831 RG |
3317 | get_constraint_for_1 (TREE_OPERAND (t, 0), results, address_p, |
3318 | lhs_p); | |
5006671f RG |
3319 | return; |
3320 | /* We are missing handling for TARGET_MEM_REF here. */ | |
e5bae89b | 3321 | default:; |
910fdc79 | 3322 | } |
e5bae89b | 3323 | break; |
910fdc79 | 3324 | } |
910fdc79 DB |
3325 | case tcc_exceptional: |
3326 | { | |
3327 | switch (TREE_CODE (t)) | |
3328 | { | |
910fdc79 | 3329 | case SSA_NAME: |
4ee00913 | 3330 | { |
c0d459f0 | 3331 | get_constraint_for_ssa_var (t, results, address_p); |
4ee00913 DB |
3332 | return; |
3333 | } | |
47d8a903 RG |
3334 | case CONSTRUCTOR: |
3335 | { | |
3336 | unsigned int i; | |
3337 | tree val; | |
3338 | VEC (ce_s, heap) *tmp = NULL; | |
3339 | FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (t), i, val) | |
3340 | { | |
3341 | struct constraint_expr *rhsp; | |
3342 | unsigned j; | |
ed6c4831 | 3343 | get_constraint_for_1 (val, &tmp, address_p, lhs_p); |
ac47786e | 3344 | FOR_EACH_VEC_ELT (ce_s, tmp, j, rhsp) |
47d8a903 RG |
3345 | VEC_safe_push (ce_s, heap, *results, rhsp); |
3346 | VEC_truncate (ce_s, tmp, 0); | |
3347 | } | |
3348 | VEC_free (ce_s, heap, tmp); | |
3349 | /* We do not know whether the constructor was complete, | |
3350 | so technically we have to add &NOTHING or &ANYTHING | |
3351 | like we do for an empty constructor as well. */ | |
3352 | return; | |
3353 | } | |
e5bae89b | 3354 | default:; |
910fdc79 | 3355 | } |
e5bae89b | 3356 | break; |
910fdc79 DB |
3357 | } |
3358 | case tcc_declaration: | |
4ee00913 | 3359 | { |
c0d459f0 | 3360 | get_constraint_for_ssa_var (t, results, address_p); |
4ee00913 DB |
3361 | return; |
3362 | } | |
1f181fde RG |
3363 | case tcc_constant: |
3364 | { | |
3365 | /* We cannot refer to automatic variables through constants. */ | |
3366 | temp.type = ADDRESSOF; | |
3367 | temp.var = nonlocal_id; | |
3368 | temp.offset = 0; | |
3369 | VEC_safe_push (ce_s, heap, *results, &temp); | |
3370 | return; | |
3371 | } | |
e5bae89b | 3372 | default:; |
910fdc79 | 3373 | } |
e5bae89b RG |
3374 | |
3375 | /* The default fallback is a constraint from anything. */ | |
3376 | temp.type = ADDRESSOF; | |
3377 | temp.var = anything_id; | |
3378 | temp.offset = 0; | |
3379 | VEC_safe_push (ce_s, heap, *results, &temp); | |
910fdc79 DB |
3380 | } |
3381 | ||
c0d459f0 RG |
3382 | /* Given a gimple tree T, return the constraint expression vector for it. */ |
3383 | ||
3384 | static void | |
3385 | get_constraint_for (tree t, VEC (ce_s, heap) **results) | |
3386 | { | |
3387 | gcc_assert (VEC_length (ce_s, *results) == 0); | |
3388 | ||
ed6c4831 RG |
3389 | get_constraint_for_1 (t, results, false, true); |
3390 | } | |
3391 | ||
3392 | /* Given a gimple tree T, return the constraint expression vector for it | |
3393 | to be used as the rhs of a constraint. */ | |
3394 | ||
3395 | static void | |
3396 | get_constraint_for_rhs (tree t, VEC (ce_s, heap) **results) | |
3397 | { | |
3398 | gcc_assert (VEC_length (ce_s, *results) == 0); | |
3399 | ||
3400 | get_constraint_for_1 (t, results, false, false); | |
c0d459f0 | 3401 | } |
910fdc79 | 3402 | |
779704e7 RG |
3403 | |
3404 | /* Efficiently generates constraints from all entries in *RHSC to all | |
3405 | entries in *LHSC. */ | |
3406 | ||
3407 | static void | |
3408 | process_all_all_constraints (VEC (ce_s, heap) *lhsc, VEC (ce_s, heap) *rhsc) | |
3409 | { | |
3410 | struct constraint_expr *lhsp, *rhsp; | |
3411 | unsigned i, j; | |
3412 | ||
3413 | if (VEC_length (ce_s, lhsc) <= 1 | |
3414 | || VEC_length (ce_s, rhsc) <= 1) | |
3415 | { | |
ac47786e NF |
3416 | FOR_EACH_VEC_ELT (ce_s, lhsc, i, lhsp) |
3417 | FOR_EACH_VEC_ELT (ce_s, rhsc, j, rhsp) | |
779704e7 RG |
3418 | process_constraint (new_constraint (*lhsp, *rhsp)); |
3419 | } | |
3420 | else | |
3421 | { | |
3422 | struct constraint_expr tmp; | |
b14e9388 | 3423 | tmp = new_scalar_tmp_constraint_exp ("allalltmp"); |
ac47786e | 3424 | FOR_EACH_VEC_ELT (ce_s, rhsc, i, rhsp) |
779704e7 | 3425 | process_constraint (new_constraint (tmp, *rhsp)); |
ac47786e | 3426 | FOR_EACH_VEC_ELT (ce_s, lhsc, i, lhsp) |
779704e7 RG |
3427 | process_constraint (new_constraint (*lhsp, tmp)); |
3428 | } | |
3429 | } | |
3430 | ||
910fdc79 DB |
3431 | /* Handle aggregate copies by expanding into copies of the respective |
3432 | fields of the structures. */ | |
3433 | ||
3434 | static void | |
3435 | do_structure_copy (tree lhsop, tree rhsop) | |
3436 | { | |
5006671f | 3437 | struct constraint_expr *lhsp, *rhsp; |
4ee00913 | 3438 | VEC (ce_s, heap) *lhsc = NULL, *rhsc = NULL; |
5006671f RG |
3439 | unsigned j; |
3440 | ||
3441 | get_constraint_for (lhsop, &lhsc); | |
ed6c4831 | 3442 | get_constraint_for_rhs (rhsop, &rhsc); |
5006671f RG |
3443 | lhsp = VEC_index (ce_s, lhsc, 0); |
3444 | rhsp = VEC_index (ce_s, rhsc, 0); | |
3445 | if (lhsp->type == DEREF | |
3446 | || (lhsp->type == ADDRESSOF && lhsp->var == anything_id) | |
3447 | || rhsp->type == DEREF) | |
b28ae58f RG |
3448 | { |
3449 | if (lhsp->type == DEREF) | |
3450 | { | |
3451 | gcc_assert (VEC_length (ce_s, lhsc) == 1); | |
3452 | lhsp->offset = UNKNOWN_OFFSET; | |
3453 | } | |
3454 | if (rhsp->type == DEREF) | |
3455 | { | |
3456 | gcc_assert (VEC_length (ce_s, rhsc) == 1); | |
3457 | rhsp->offset = UNKNOWN_OFFSET; | |
3458 | } | |
3459 | process_all_all_constraints (lhsc, rhsc); | |
3460 | } | |
5006671f RG |
3461 | else if (lhsp->type == SCALAR |
3462 | && (rhsp->type == SCALAR | |
3463 | || rhsp->type == ADDRESSOF)) | |
910fdc79 | 3464 | { |
5006671f RG |
3465 | HOST_WIDE_INT lhssize, lhsmaxsize, lhsoffset; |
3466 | HOST_WIDE_INT rhssize, rhsmaxsize, rhsoffset; | |
3467 | unsigned k = 0; | |
0f900dfa JJ |
3468 | get_ref_base_and_extent (lhsop, &lhsoffset, &lhssize, &lhsmaxsize); |
3469 | get_ref_base_and_extent (rhsop, &rhsoffset, &rhssize, &rhsmaxsize); | |
5006671f | 3470 | for (j = 0; VEC_iterate (ce_s, lhsc, j, lhsp);) |
910fdc79 | 3471 | { |
5006671f RG |
3472 | varinfo_t lhsv, rhsv; |
3473 | rhsp = VEC_index (ce_s, rhsc, k); | |
3474 | lhsv = get_varinfo (lhsp->var); | |
3475 | rhsv = get_varinfo (rhsp->var); | |
3476 | if (lhsv->may_have_pointers | |
c636a4fb RG |
3477 | && (lhsv->is_full_var |
3478 | || rhsv->is_full_var | |
3479 | || ranges_overlap_p (lhsv->offset + rhsoffset, lhsv->size, | |
3480 | rhsv->offset + lhsoffset, rhsv->size))) | |
5006671f | 3481 | process_constraint (new_constraint (*lhsp, *rhsp)); |
c636a4fb RG |
3482 | if (!rhsv->is_full_var |
3483 | && (lhsv->is_full_var | |
3484 | || (lhsv->offset + rhsoffset + lhsv->size | |
3485 | > rhsv->offset + lhsoffset + rhsv->size))) | |
5006671f RG |
3486 | { |
3487 | ++k; | |
3488 | if (k >= VEC_length (ce_s, rhsc)) | |
3489 | break; | |
3490 | } | |
910fdc79 | 3491 | else |
5006671f | 3492 | ++j; |
910fdc79 DB |
3493 | } |
3494 | } | |
3495 | else | |
5006671f | 3496 | gcc_unreachable (); |
a5eadacc | 3497 | |
5006671f RG |
3498 | VEC_free (ce_s, heap, lhsc); |
3499 | VEC_free (ce_s, heap, rhsc); | |
910fdc79 DB |
3500 | } |
3501 | ||
cb89b4b0 | 3502 | /* Create constraints ID = { rhsc }. */ |
b7091901 RG |
3503 | |
3504 | static void | |
cb89b4b0 | 3505 | make_constraints_to (unsigned id, VEC(ce_s, heap) *rhsc) |
b7091901 | 3506 | { |
b7091901 RG |
3507 | struct constraint_expr *c; |
3508 | struct constraint_expr includes; | |
3509 | unsigned int j; | |
3510 | ||
3511 | includes.var = id; | |
3512 | includes.offset = 0; | |
3513 | includes.type = SCALAR; | |
3514 | ||
ac47786e | 3515 | FOR_EACH_VEC_ELT (ce_s, rhsc, j, c) |
faf2ecc5 | 3516 | process_constraint (new_constraint (includes, *c)); |
cb89b4b0 RG |
3517 | } |
3518 | ||
3519 | /* Create a constraint ID = OP. */ | |
3520 | ||
3521 | static void | |
3522 | make_constraint_to (unsigned id, tree op) | |
3523 | { | |
3524 | VEC(ce_s, heap) *rhsc = NULL; | |
3525 | get_constraint_for_rhs (op, &rhsc); | |
3526 | make_constraints_to (id, rhsc); | |
b7091901 RG |
3527 | VEC_free (ce_s, heap, rhsc); |
3528 | } | |
3529 | ||
74d27244 RG |
3530 | /* Create a constraint ID = &FROM. */ |
3531 | ||
3532 | static void | |
3533 | make_constraint_from (varinfo_t vi, int from) | |
3534 | { | |
3535 | struct constraint_expr lhs, rhs; | |
3536 | ||
3537 | lhs.var = vi->id; | |
3538 | lhs.offset = 0; | |
3539 | lhs.type = SCALAR; | |
3540 | ||
3541 | rhs.var = from; | |
3542 | rhs.offset = 0; | |
3543 | rhs.type = ADDRESSOF; | |
3544 | process_constraint (new_constraint (lhs, rhs)); | |
3545 | } | |
3546 | ||
3547 | /* Create a constraint ID = FROM. */ | |
3548 | ||
3549 | static void | |
3550 | make_copy_constraint (varinfo_t vi, int from) | |
3551 | { | |
3552 | struct constraint_expr lhs, rhs; | |
3553 | ||
3554 | lhs.var = vi->id; | |
3555 | lhs.offset = 0; | |
3556 | lhs.type = SCALAR; | |
3557 | ||
3558 | rhs.var = from; | |
3559 | rhs.offset = 0; | |
3560 | rhs.type = SCALAR; | |
3561 | process_constraint (new_constraint (lhs, rhs)); | |
3562 | } | |
3563 | ||
b7091901 RG |
3564 | /* Make constraints necessary to make OP escape. */ |
3565 | ||
3566 | static void | |
3567 | make_escape_constraint (tree op) | |
3568 | { | |
3569 | make_constraint_to (escaped_id, op); | |
3570 | } | |
3571 | ||
3e8542ca RG |
3572 | /* Add constraints to that the solution of VI is transitively closed. */ |
3573 | ||
3574 | static void | |
3575 | make_transitive_closure_constraints (varinfo_t vi) | |
3576 | { | |
3577 | struct constraint_expr lhs, rhs; | |
3578 | ||
3579 | /* VAR = *VAR; */ | |
3580 | lhs.type = SCALAR; | |
3581 | lhs.var = vi->id; | |
3582 | lhs.offset = 0; | |
3583 | rhs.type = DEREF; | |
3584 | rhs.var = vi->id; | |
3585 | rhs.offset = 0; | |
3586 | process_constraint (new_constraint (lhs, rhs)); | |
3587 | ||
3588 | /* VAR = VAR + UNKNOWN; */ | |
3589 | lhs.type = SCALAR; | |
3590 | lhs.var = vi->id; | |
3591 | lhs.offset = 0; | |
3592 | rhs.type = SCALAR; | |
3593 | rhs.var = vi->id; | |
3594 | rhs.offset = UNKNOWN_OFFSET; | |
3595 | process_constraint (new_constraint (lhs, rhs)); | |
3596 | } | |
3597 | ||
7d6e2521 RG |
3598 | /* Temporary storage for fake var decls. */ |
3599 | struct obstack fake_var_decl_obstack; | |
3600 | ||
3601 | /* Build a fake VAR_DECL acting as referrer to a DECL_UID. */ | |
3602 | ||
3603 | static tree | |
3604 | build_fake_var_decl (tree type) | |
3605 | { | |
3606 | tree decl = (tree) XOBNEW (&fake_var_decl_obstack, struct tree_var_decl); | |
3607 | memset (decl, 0, sizeof (struct tree_var_decl)); | |
3608 | TREE_SET_CODE (decl, VAR_DECL); | |
3609 | TREE_TYPE (decl) = type; | |
3610 | DECL_UID (decl) = allocate_decl_uid (); | |
3611 | SET_DECL_PT_UID (decl, -1); | |
3612 | layout_decl (decl, 0); | |
3613 | return decl; | |
3614 | } | |
3615 | ||
0b7b376d RG |
3616 | /* Create a new artificial heap variable with NAME. |
3617 | Return the created variable. */ | |
74d27244 RG |
3618 | |
3619 | static varinfo_t | |
7d6e2521 | 3620 | make_heapvar (const char *name) |
74d27244 RG |
3621 | { |
3622 | varinfo_t vi; | |
7d6e2521 RG |
3623 | tree heapvar; |
3624 | ||
3625 | heapvar = build_fake_var_decl (ptr_type_node); | |
3626 | DECL_EXTERNAL (heapvar) = 1; | |
74d27244 RG |
3627 | |
3628 | vi = new_var_info (heapvar, name); | |
3629 | vi->is_artificial_var = true; | |
3630 | vi->is_heap_var = true; | |
3631 | vi->is_unknown_size_var = true; | |
b41e33fe | 3632 | vi->offset = 0; |
74d27244 RG |
3633 | vi->fullsize = ~0; |
3634 | vi->size = ~0; | |
3635 | vi->is_full_var = true; | |
3636 | insert_vi_for_tree (heapvar, vi); | |
3637 | ||
0b7b376d RG |
3638 | return vi; |
3639 | } | |
3640 | ||
3641 | /* Create a new artificial heap variable with NAME and make a | |
d3553615 RG |
3642 | constraint from it to LHS. Set flags according to a tag used |
3643 | for tracking restrict pointers. */ | |
0b7b376d RG |
3644 | |
3645 | static varinfo_t | |
d3553615 | 3646 | make_constraint_from_restrict (varinfo_t lhs, const char *name) |
0b7b376d | 3647 | { |
7d6e2521 | 3648 | varinfo_t vi = make_heapvar (name); |
d3553615 RG |
3649 | vi->is_global_var = 1; |
3650 | vi->may_have_pointers = 1; | |
74d27244 | 3651 | make_constraint_from (lhs, vi->id); |
74d27244 RG |
3652 | return vi; |
3653 | } | |
3654 | ||
3655 | /* Create a new artificial heap variable with NAME and make a | |
3656 | constraint from it to LHS. Set flags according to a tag used | |
d3553615 RG |
3657 | for tracking restrict pointers and make the artificial heap |
3658 | point to global memory. */ | |
74d27244 | 3659 | |
d3553615 RG |
3660 | static varinfo_t |
3661 | make_constraint_from_global_restrict (varinfo_t lhs, const char *name) | |
74d27244 | 3662 | { |
d3553615 RG |
3663 | varinfo_t vi = make_constraint_from_restrict (lhs, name); |
3664 | make_copy_constraint (vi, nonlocal_id); | |
3665 | return vi; | |
74d27244 RG |
3666 | } |
3667 | ||
25a6a873 RG |
3668 | /* In IPA mode there are varinfos for different aspects of reach |
3669 | function designator. One for the points-to set of the return | |
3670 | value, one for the variables that are clobbered by the function, | |
3671 | one for its uses and one for each parameter (including a single | |
3672 | glob for remaining variadic arguments). */ | |
3673 | ||
3674 | enum { fi_clobbers = 1, fi_uses = 2, | |
3675 | fi_static_chain = 3, fi_result = 4, fi_parm_base = 5 }; | |
3676 | ||
3677 | /* Get a constraint for the requested part of a function designator FI | |
3678 | when operating in IPA mode. */ | |
3679 | ||
3680 | static struct constraint_expr | |
3681 | get_function_part_constraint (varinfo_t fi, unsigned part) | |
3682 | { | |
3683 | struct constraint_expr c; | |
3684 | ||
3685 | gcc_assert (in_ipa_mode); | |
3686 | ||
3687 | if (fi->id == anything_id) | |
3688 | { | |
3689 | /* ??? We probably should have a ANYFN special variable. */ | |
3690 | c.var = anything_id; | |
3691 | c.offset = 0; | |
3692 | c.type = SCALAR; | |
3693 | } | |
3694 | else if (TREE_CODE (fi->decl) == FUNCTION_DECL) | |
3695 | { | |
3696 | varinfo_t ai = first_vi_for_offset (fi, part); | |
18abb35e RG |
3697 | if (ai) |
3698 | c.var = ai->id; | |
3699 | else | |
3700 | c.var = anything_id; | |
25a6a873 RG |
3701 | c.offset = 0; |
3702 | c.type = SCALAR; | |
3703 | } | |
3704 | else | |
3705 | { | |
3706 | c.var = fi->id; | |
3707 | c.offset = part; | |
3708 | c.type = DEREF; | |
3709 | } | |
3710 | ||
3711 | return c; | |
3712 | } | |
3713 | ||
7b765bed DB |
3714 | /* For non-IPA mode, generate constraints necessary for a call on the |
3715 | RHS. */ | |
3716 | ||
3717 | static void | |
472c7fbd | 3718 | handle_rhs_call (gimple stmt, VEC(ce_s, heap) **results) |
7b765bed | 3719 | { |
472c7fbd | 3720 | struct constraint_expr rhsc; |
726a989a | 3721 | unsigned i; |
0b7b376d | 3722 | bool returns_uses = false; |
7b765bed | 3723 | |
726a989a RB |
3724 | for (i = 0; i < gimple_call_num_args (stmt); ++i) |
3725 | { | |
3726 | tree arg = gimple_call_arg (stmt, i); | |
0b7b376d | 3727 | int flags = gimple_call_arg_flags (stmt, i); |
726a989a | 3728 | |
0f8d6231 RG |
3729 | /* If the argument is not used we can ignore it. */ |
3730 | if (flags & EAF_UNUSED) | |
0b7b376d RG |
3731 | continue; |
3732 | ||
3733 | /* As we compute ESCAPED context-insensitive we do not gain | |
3734 | any precision with just EAF_NOCLOBBER but not EAF_NOESCAPE | |
3735 | set. The argument would still get clobbered through the | |
3736 | escape solution. | |
3737 | ??? We might get away with less (and more precise) constraints | |
3738 | if using a temporary for transitively closing things. */ | |
3739 | if ((flags & EAF_NOCLOBBER) | |
3740 | && (flags & EAF_NOESCAPE)) | |
3741 | { | |
3742 | varinfo_t uses = get_call_use_vi (stmt); | |
3743 | if (!(flags & EAF_DIRECT)) | |
3744 | make_transitive_closure_constraints (uses); | |
3745 | make_constraint_to (uses->id, arg); | |
3746 | returns_uses = true; | |
3747 | } | |
3748 | else if (flags & EAF_NOESCAPE) | |
3749 | { | |
3750 | varinfo_t uses = get_call_use_vi (stmt); | |
3751 | varinfo_t clobbers = get_call_clobber_vi (stmt); | |
3752 | if (!(flags & EAF_DIRECT)) | |
3753 | { | |
3754 | make_transitive_closure_constraints (uses); | |
3755 | make_transitive_closure_constraints (clobbers); | |
3756 | } | |
3757 | make_constraint_to (uses->id, arg); | |
3758 | make_constraint_to (clobbers->id, arg); | |
3759 | returns_uses = true; | |
3760 | } | |
3761 | else | |
726a989a RB |
3762 | make_escape_constraint (arg); |
3763 | } | |
b7091901 | 3764 | |
0b7b376d RG |
3765 | /* If we added to the calls uses solution make sure we account for |
3766 | pointers to it to be returned. */ | |
3767 | if (returns_uses) | |
3768 | { | |
3769 | rhsc.var = get_call_use_vi (stmt)->id; | |
3770 | rhsc.offset = 0; | |
3771 | rhsc.type = SCALAR; | |
3772 | VEC_safe_push (ce_s, heap, *results, &rhsc); | |
3773 | } | |
3774 | ||
b7091901 | 3775 | /* The static chain escapes as well. */ |
726a989a RB |
3776 | if (gimple_call_chain (stmt)) |
3777 | make_escape_constraint (gimple_call_chain (stmt)); | |
472c7fbd | 3778 | |
1d24fdd9 RG |
3779 | /* And if we applied NRV the address of the return slot escapes as well. */ |
3780 | if (gimple_call_return_slot_opt_p (stmt) | |
3781 | && gimple_call_lhs (stmt) != NULL_TREE | |
4d61856d | 3782 | && TREE_ADDRESSABLE (TREE_TYPE (gimple_call_lhs (stmt)))) |
1d24fdd9 RG |
3783 | { |
3784 | VEC(ce_s, heap) *tmpc = NULL; | |
3785 | struct constraint_expr lhsc, *c; | |
3786 | get_constraint_for_address_of (gimple_call_lhs (stmt), &tmpc); | |
3787 | lhsc.var = escaped_id; | |
3788 | lhsc.offset = 0; | |
3789 | lhsc.type = SCALAR; | |
ac47786e | 3790 | FOR_EACH_VEC_ELT (ce_s, tmpc, i, c) |
1d24fdd9 RG |
3791 | process_constraint (new_constraint (lhsc, *c)); |
3792 | VEC_free(ce_s, heap, tmpc); | |
3793 | } | |
3794 | ||
5006671f RG |
3795 | /* Regular functions return nonlocal memory. */ |
3796 | rhsc.var = nonlocal_id; | |
472c7fbd | 3797 | rhsc.offset = 0; |
5006671f | 3798 | rhsc.type = SCALAR; |
472c7fbd | 3799 | VEC_safe_push (ce_s, heap, *results, &rhsc); |
7b765bed | 3800 | } |
e8ca4159 | 3801 | |
af947da7 RG |
3802 | /* For non-IPA mode, generate constraints necessary for a call |
3803 | that returns a pointer and assigns it to LHS. This simply makes | |
b7091901 | 3804 | the LHS point to global and escaped variables. */ |
af947da7 RG |
3805 | |
3806 | static void | |
0b7b376d RG |
3807 | handle_lhs_call (gimple stmt, tree lhs, int flags, VEC(ce_s, heap) *rhsc, |
3808 | tree fndecl) | |
af947da7 RG |
3809 | { |
3810 | VEC(ce_s, heap) *lhsc = NULL; | |
af947da7 | 3811 | |
b7091901 | 3812 | get_constraint_for (lhs, &lhsc); |
0b7b376d RG |
3813 | /* If the store is to a global decl make sure to |
3814 | add proper escape constraints. */ | |
3815 | lhs = get_base_address (lhs); | |
3816 | if (lhs | |
3817 | && DECL_P (lhs) | |
3818 | && is_global_var (lhs)) | |
3819 | { | |
3820 | struct constraint_expr tmpc; | |
3821 | tmpc.var = escaped_id; | |
3822 | tmpc.offset = 0; | |
3823 | tmpc.type = SCALAR; | |
3824 | VEC_safe_push (ce_s, heap, lhsc, &tmpc); | |
3825 | } | |
183ae595 | 3826 | |
0b7b376d RG |
3827 | /* If the call returns an argument unmodified override the rhs |
3828 | constraints. */ | |
3829 | flags = gimple_call_return_flags (stmt); | |
3830 | if (flags & ERF_RETURNS_ARG | |
3831 | && (flags & ERF_RETURN_ARG_MASK) < gimple_call_num_args (stmt)) | |
3832 | { | |
3833 | tree arg; | |
3834 | rhsc = NULL; | |
3835 | arg = gimple_call_arg (stmt, flags & ERF_RETURN_ARG_MASK); | |
3836 | get_constraint_for (arg, &rhsc); | |
3837 | process_all_all_constraints (lhsc, rhsc); | |
3838 | VEC_free (ce_s, heap, rhsc); | |
3839 | } | |
3840 | else if (flags & ERF_NOALIAS) | |
183ae595 | 3841 | { |
183ae595 | 3842 | varinfo_t vi; |
0b7b376d RG |
3843 | struct constraint_expr tmpc; |
3844 | rhsc = NULL; | |
7d6e2521 | 3845 | vi = make_heapvar ("HEAP"); |
14c41b9b RG |
3846 | /* We delay marking allocated storage global until we know if |
3847 | it escapes. */ | |
91deb937 | 3848 | DECL_EXTERNAL (vi->decl) = 0; |
14c41b9b | 3849 | vi->is_global_var = 0; |
72d182d3 | 3850 | /* If this is not a real malloc call assume the memory was |
0b7b376d | 3851 | initialized and thus may point to global memory. All |
72d182d3 RG |
3852 | builtin functions with the malloc attribute behave in a sane way. */ |
3853 | if (!fndecl | |
3854 | || DECL_BUILT_IN_CLASS (fndecl) != BUILT_IN_NORMAL) | |
3855 | make_constraint_from (vi, nonlocal_id); | |
0b7b376d RG |
3856 | tmpc.var = vi->id; |
3857 | tmpc.offset = 0; | |
3858 | tmpc.type = ADDRESSOF; | |
3859 | VEC_safe_push (ce_s, heap, rhsc, &tmpc); | |
183ae595 | 3860 | } |
0b7b376d RG |
3861 | |
3862 | process_all_all_constraints (lhsc, rhsc); | |
3863 | ||
b7091901 RG |
3864 | VEC_free (ce_s, heap, lhsc); |
3865 | } | |
3866 | ||
3867 | /* For non-IPA mode, generate constraints necessary for a call of a | |
3868 | const function that returns a pointer in the statement STMT. */ | |
3869 | ||
3870 | static void | |
472c7fbd | 3871 | handle_const_call (gimple stmt, VEC(ce_s, heap) **results) |
b7091901 | 3872 | { |
b14e9388 | 3873 | struct constraint_expr rhsc; |
472c7fbd | 3874 | unsigned int k; |
b7091901 | 3875 | |
472c7fbd RG |
3876 | /* Treat nested const functions the same as pure functions as far |
3877 | as the static chain is concerned. */ | |
726a989a | 3878 | if (gimple_call_chain (stmt)) |
b7091901 | 3879 | { |
3e8542ca RG |
3880 | varinfo_t uses = get_call_use_vi (stmt); |
3881 | make_transitive_closure_constraints (uses); | |
3882 | make_constraint_to (uses->id, gimple_call_chain (stmt)); | |
3883 | rhsc.var = uses->id; | |
b7091901 | 3884 | rhsc.offset = 0; |
472c7fbd RG |
3885 | rhsc.type = SCALAR; |
3886 | VEC_safe_push (ce_s, heap, *results, &rhsc); | |
b7091901 RG |
3887 | } |
3888 | ||
b7091901 | 3889 | /* May return arguments. */ |
726a989a RB |
3890 | for (k = 0; k < gimple_call_num_args (stmt); ++k) |
3891 | { | |
3892 | tree arg = gimple_call_arg (stmt, k); | |
0f8d6231 RG |
3893 | VEC(ce_s, heap) *argc = NULL; |
3894 | unsigned i; | |
3895 | struct constraint_expr *argp; | |
3896 | get_constraint_for_rhs (arg, &argc); | |
3897 | FOR_EACH_VEC_ELT (ce_s, argc, i, argp) | |
3898 | VEC_safe_push (ce_s, heap, *results, argp); | |
3899 | VEC_free(ce_s, heap, argc); | |
726a989a | 3900 | } |
b7091901 | 3901 | |
472c7fbd RG |
3902 | /* May return addresses of globals. */ |
3903 | rhsc.var = nonlocal_id; | |
3904 | rhsc.offset = 0; | |
3905 | rhsc.type = ADDRESSOF; | |
3906 | VEC_safe_push (ce_s, heap, *results, &rhsc); | |
af947da7 RG |
3907 | } |
3908 | ||
15c15196 RG |
3909 | /* For non-IPA mode, generate constraints necessary for a call to a |
3910 | pure function in statement STMT. */ | |
3911 | ||
3912 | static void | |
472c7fbd | 3913 | handle_pure_call (gimple stmt, VEC(ce_s, heap) **results) |
15c15196 | 3914 | { |
472c7fbd | 3915 | struct constraint_expr rhsc; |
726a989a | 3916 | unsigned i; |
3e8542ca | 3917 | varinfo_t uses = NULL; |
15c15196 RG |
3918 | |
3919 | /* Memory reached from pointer arguments is call-used. */ | |
726a989a RB |
3920 | for (i = 0; i < gimple_call_num_args (stmt); ++i) |
3921 | { | |
3922 | tree arg = gimple_call_arg (stmt, i); | |
0f8d6231 | 3923 | if (!uses) |
472c7fbd | 3924 | { |
0f8d6231 RG |
3925 | uses = get_call_use_vi (stmt); |
3926 | make_transitive_closure_constraints (uses); | |
472c7fbd | 3927 | } |
0f8d6231 | 3928 | make_constraint_to (uses->id, arg); |
726a989a | 3929 | } |
15c15196 RG |
3930 | |
3931 | /* The static chain is used as well. */ | |
726a989a | 3932 | if (gimple_call_chain (stmt)) |
15c15196 | 3933 | { |
3e8542ca RG |
3934 | if (!uses) |
3935 | { | |
3936 | uses = get_call_use_vi (stmt); | |
3937 | make_transitive_closure_constraints (uses); | |
3938 | } | |
3939 | make_constraint_to (uses->id, gimple_call_chain (stmt)); | |
472c7fbd | 3940 | } |
15c15196 | 3941 | |
3e8542ca RG |
3942 | /* Pure functions may return call-used and nonlocal memory. */ |
3943 | if (uses) | |
472c7fbd | 3944 | { |
3e8542ca | 3945 | rhsc.var = uses->id; |
15c15196 | 3946 | rhsc.offset = 0; |
472c7fbd RG |
3947 | rhsc.type = SCALAR; |
3948 | VEC_safe_push (ce_s, heap, *results, &rhsc); | |
15c15196 | 3949 | } |
5006671f | 3950 | rhsc.var = nonlocal_id; |
472c7fbd | 3951 | rhsc.offset = 0; |
5006671f | 3952 | rhsc.type = SCALAR; |
472c7fbd | 3953 | VEC_safe_push (ce_s, heap, *results, &rhsc); |
15c15196 RG |
3954 | } |
3955 | ||
25a6a873 RG |
3956 | |
3957 | /* Return the varinfo for the callee of CALL. */ | |
3958 | ||
3959 | static varinfo_t | |
3960 | get_fi_for_callee (gimple call) | |
3961 | { | |
5c04e9f4 | 3962 | tree decl, fn = gimple_call_fn (call); |
25a6a873 | 3963 | |
5c04e9f4 RG |
3964 | if (fn && TREE_CODE (fn) == OBJ_TYPE_REF) |
3965 | fn = OBJ_TYPE_REF_EXPR (fn); | |
25583c4f | 3966 | |
25a6a873 RG |
3967 | /* If we can directly resolve the function being called, do so. |
3968 | Otherwise, it must be some sort of indirect expression that | |
3969 | we should still be able to handle. */ | |
5c04e9f4 | 3970 | decl = gimple_call_addr_fndecl (fn); |
25a6a873 RG |
3971 | if (decl) |
3972 | return get_vi_for_tree (decl); | |
3973 | ||
5c04e9f4 | 3974 | /* If the function is anything other than a SSA name pointer we have no |
25a6a873 | 3975 | clue and should be getting ANYFN (well, ANYTHING for now). */ |
5c04e9f4 | 3976 | if (!fn || TREE_CODE (fn) != SSA_NAME) |
25a6a873 | 3977 | return get_varinfo (anything_id); |
5c04e9f4 RG |
3978 | |
3979 | if ((TREE_CODE (SSA_NAME_VAR (fn)) == PARM_DECL | |
3980 | || TREE_CODE (SSA_NAME_VAR (fn)) == RESULT_DECL) | |
3981 | && SSA_NAME_IS_DEFAULT_DEF (fn)) | |
3982 | fn = SSA_NAME_VAR (fn); | |
3983 | ||
3984 | return get_vi_for_tree (fn); | |
25a6a873 RG |
3985 | } |
3986 | ||
e38811ce RG |
3987 | /* Create constraints for the builtin call T. Return true if the call |
3988 | was handled, otherwise false. */ | |
910fdc79 | 3989 | |
e38811ce RG |
3990 | static bool |
3991 | find_func_aliases_for_builtin_call (gimple t) | |
910fdc79 | 3992 | { |
e38811ce | 3993 | tree fndecl = gimple_call_fndecl (t); |
4ee00913 DB |
3994 | VEC(ce_s, heap) *lhsc = NULL; |
3995 | VEC(ce_s, heap) *rhsc = NULL; | |
25a6a873 | 3996 | varinfo_t fi; |
910fdc79 | 3997 | |
e38811ce RG |
3998 | if (fndecl != NULL_TREE |
3999 | && DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_NORMAL) | |
4000 | /* ??? All builtins that are handled here need to be handled | |
4001 | in the alias-oracle query functions explicitly! */ | |
4002 | switch (DECL_FUNCTION_CODE (fndecl)) | |
4003 | { | |
4004 | /* All the following functions return a pointer to the same object | |
4005 | as their first argument points to. The functions do not add | |
4006 | to the ESCAPED solution. The functions make the first argument | |
4007 | pointed to memory point to what the second argument pointed to | |
4008 | memory points to. */ | |
4009 | case BUILT_IN_STRCPY: | |
4010 | case BUILT_IN_STRNCPY: | |
4011 | case BUILT_IN_BCOPY: | |
4012 | case BUILT_IN_MEMCPY: | |
4013 | case BUILT_IN_MEMMOVE: | |
4014 | case BUILT_IN_MEMPCPY: | |
4015 | case BUILT_IN_STPCPY: | |
4016 | case BUILT_IN_STPNCPY: | |
4017 | case BUILT_IN_STRCAT: | |
4018 | case BUILT_IN_STRNCAT: | |
36dc1a88 JJ |
4019 | case BUILT_IN_STRCPY_CHK: |
4020 | case BUILT_IN_STRNCPY_CHK: | |
4021 | case BUILT_IN_MEMCPY_CHK: | |
4022 | case BUILT_IN_MEMMOVE_CHK: | |
4023 | case BUILT_IN_MEMPCPY_CHK: | |
4024 | case BUILT_IN_STPCPY_CHK: | |
f3fc9b80 | 4025 | case BUILT_IN_STPNCPY_CHK: |
36dc1a88 JJ |
4026 | case BUILT_IN_STRCAT_CHK: |
4027 | case BUILT_IN_STRNCAT_CHK: | |
0a35513e AH |
4028 | case BUILT_IN_TM_MEMCPY: |
4029 | case BUILT_IN_TM_MEMMOVE: | |
e8ca4159 | 4030 | { |
e38811ce RG |
4031 | tree res = gimple_call_lhs (t); |
4032 | tree dest = gimple_call_arg (t, (DECL_FUNCTION_CODE (fndecl) | |
4033 | == BUILT_IN_BCOPY ? 1 : 0)); | |
4034 | tree src = gimple_call_arg (t, (DECL_FUNCTION_CODE (fndecl) | |
4035 | == BUILT_IN_BCOPY ? 0 : 1)); | |
4036 | if (res != NULL_TREE) | |
0f8d6231 | 4037 | { |
e38811ce RG |
4038 | get_constraint_for (res, &lhsc); |
4039 | if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_MEMPCPY | |
4040 | || DECL_FUNCTION_CODE (fndecl) == BUILT_IN_STPCPY | |
ce7e54ff JJ |
4041 | || DECL_FUNCTION_CODE (fndecl) == BUILT_IN_STPNCPY |
4042 | || DECL_FUNCTION_CODE (fndecl) == BUILT_IN_MEMPCPY_CHK | |
f3fc9b80 RG |
4043 | || DECL_FUNCTION_CODE (fndecl) == BUILT_IN_STPCPY_CHK |
4044 | || DECL_FUNCTION_CODE (fndecl) == BUILT_IN_STPNCPY_CHK) | |
e38811ce RG |
4045 | get_constraint_for_ptr_offset (dest, NULL_TREE, &rhsc); |
4046 | else | |
4047 | get_constraint_for (dest, &rhsc); | |
4048 | process_all_all_constraints (lhsc, rhsc); | |
4049 | VEC_free (ce_s, heap, lhsc); | |
4050 | VEC_free (ce_s, heap, rhsc); | |
c58936b6 | 4051 | } |
e38811ce RG |
4052 | get_constraint_for_ptr_offset (dest, NULL_TREE, &lhsc); |
4053 | get_constraint_for_ptr_offset (src, NULL_TREE, &rhsc); | |
4054 | do_deref (&lhsc); | |
4055 | do_deref (&rhsc); | |
4056 | process_all_all_constraints (lhsc, rhsc); | |
4057 | VEC_free (ce_s, heap, lhsc); | |
4058 | VEC_free (ce_s, heap, rhsc); | |
4059 | return true; | |
4ee00913 | 4060 | } |
e38811ce | 4061 | case BUILT_IN_MEMSET: |
36dc1a88 | 4062 | case BUILT_IN_MEMSET_CHK: |
0a35513e | 4063 | case BUILT_IN_TM_MEMSET: |
e38811ce RG |
4064 | { |
4065 | tree res = gimple_call_lhs (t); | |
4066 | tree dest = gimple_call_arg (t, 0); | |
4067 | unsigned i; | |
4068 | ce_s *lhsp; | |
4069 | struct constraint_expr ac; | |
4070 | if (res != NULL_TREE) | |
779704e7 | 4071 | { |
e38811ce RG |
4072 | get_constraint_for (res, &lhsc); |
4073 | get_constraint_for (dest, &rhsc); | |
779704e7 RG |
4074 | process_all_all_constraints (lhsc, rhsc); |
4075 | VEC_free (ce_s, heap, lhsc); | |
4076 | VEC_free (ce_s, heap, rhsc); | |
779704e7 | 4077 | } |
e38811ce RG |
4078 | get_constraint_for_ptr_offset (dest, NULL_TREE, &lhsc); |
4079 | do_deref (&lhsc); | |
4080 | if (flag_delete_null_pointer_checks | |
4081 | && integer_zerop (gimple_call_arg (t, 1))) | |
779704e7 | 4082 | { |
e38811ce RG |
4083 | ac.type = ADDRESSOF; |
4084 | ac.var = nothing_id; | |
779704e7 | 4085 | } |
e38811ce | 4086 | else |
25a6a873 | 4087 | { |
e38811ce RG |
4088 | ac.type = SCALAR; |
4089 | ac.var = integer_id; | |
25a6a873 | 4090 | } |
e38811ce RG |
4091 | ac.offset = 0; |
4092 | FOR_EACH_VEC_ELT (ce_s, lhsc, i, lhsp) | |
4093 | process_constraint (new_constraint (*lhsp, ac)); | |
4094 | VEC_free (ce_s, heap, lhsc); | |
4095 | return true; | |
4096 | } | |
d9048d16 JJ |
4097 | case BUILT_IN_ASSUME_ALIGNED: |
4098 | { | |
4099 | tree res = gimple_call_lhs (t); | |
4100 | tree dest = gimple_call_arg (t, 0); | |
4101 | if (res != NULL_TREE) | |
4102 | { | |
4103 | get_constraint_for (res, &lhsc); | |
4104 | get_constraint_for (dest, &rhsc); | |
4105 | process_all_all_constraints (lhsc, rhsc); | |
4106 | VEC_free (ce_s, heap, lhsc); | |
4107 | VEC_free (ce_s, heap, rhsc); | |
4108 | } | |
4109 | return true; | |
4110 | } | |
e38811ce RG |
4111 | /* All the following functions do not return pointers, do not |
4112 | modify the points-to sets of memory reachable from their | |
4113 | arguments and do not add to the ESCAPED solution. */ | |
4114 | case BUILT_IN_SINCOS: | |
4115 | case BUILT_IN_SINCOSF: | |
4116 | case BUILT_IN_SINCOSL: | |
4117 | case BUILT_IN_FREXP: | |
4118 | case BUILT_IN_FREXPF: | |
4119 | case BUILT_IN_FREXPL: | |
4120 | case BUILT_IN_GAMMA_R: | |
4121 | case BUILT_IN_GAMMAF_R: | |
4122 | case BUILT_IN_GAMMAL_R: | |
4123 | case BUILT_IN_LGAMMA_R: | |
4124 | case BUILT_IN_LGAMMAF_R: | |
4125 | case BUILT_IN_LGAMMAL_R: | |
4126 | case BUILT_IN_MODF: | |
4127 | case BUILT_IN_MODFF: | |
4128 | case BUILT_IN_MODFL: | |
4129 | case BUILT_IN_REMQUO: | |
4130 | case BUILT_IN_REMQUOF: | |
4131 | case BUILT_IN_REMQUOL: | |
4132 | case BUILT_IN_FREE: | |
4133 | return true; | |
915afed6 JJ |
4134 | case BUILT_IN_STRDUP: |
4135 | case BUILT_IN_STRNDUP: | |
4136 | if (gimple_call_lhs (t)) | |
4137 | { | |
4138 | handle_lhs_call (t, gimple_call_lhs (t), gimple_call_flags (t), | |
4139 | NULL, fndecl); | |
4140 | get_constraint_for_ptr_offset (gimple_call_lhs (t), | |
4141 | NULL_TREE, &lhsc); | |
4142 | get_constraint_for_ptr_offset (gimple_call_arg (t, 0), | |
4143 | NULL_TREE, &rhsc); | |
4144 | do_deref (&lhsc); | |
4145 | do_deref (&rhsc); | |
4146 | process_all_all_constraints (lhsc, rhsc); | |
4147 | VEC_free (ce_s, heap, lhsc); | |
4148 | VEC_free (ce_s, heap, rhsc); | |
4149 | return true; | |
4150 | } | |
4151 | break; | |
e38811ce RG |
4152 | /* Trampolines are special - they set up passing the static |
4153 | frame. */ | |
4154 | case BUILT_IN_INIT_TRAMPOLINE: | |
4155 | { | |
4156 | tree tramp = gimple_call_arg (t, 0); | |
4157 | tree nfunc = gimple_call_arg (t, 1); | |
4158 | tree frame = gimple_call_arg (t, 2); | |
4159 | unsigned i; | |
4160 | struct constraint_expr lhs, *rhsp; | |
4161 | if (in_ipa_mode) | |
25a6a873 | 4162 | { |
e38811ce RG |
4163 | varinfo_t nfi = NULL; |
4164 | gcc_assert (TREE_CODE (nfunc) == ADDR_EXPR); | |
4165 | nfi = lookup_vi_for_tree (TREE_OPERAND (nfunc, 0)); | |
4166 | if (nfi) | |
25a6a873 | 4167 | { |
e38811ce RG |
4168 | lhs = get_function_part_constraint (nfi, fi_static_chain); |
4169 | get_constraint_for (frame, &rhsc); | |
4170 | FOR_EACH_VEC_ELT (ce_s, rhsc, i, rhsp) | |
4171 | process_constraint (new_constraint (lhs, *rhsp)); | |
4172 | VEC_free (ce_s, heap, rhsc); | |
4173 | ||
4174 | /* Make the frame point to the function for | |
4175 | the trampoline adjustment call. */ | |
4176 | get_constraint_for (tramp, &lhsc); | |
4177 | do_deref (&lhsc); | |
4178 | get_constraint_for (nfunc, &rhsc); | |
25a6a873 RG |
4179 | process_all_all_constraints (lhsc, rhsc); |
4180 | VEC_free (ce_s, heap, rhsc); | |
4181 | VEC_free (ce_s, heap, lhsc); | |
e38811ce RG |
4182 | |
4183 | return true; | |
25a6a873 | 4184 | } |
25a6a873 | 4185 | } |
e38811ce RG |
4186 | /* Else fallthru to generic handling which will let |
4187 | the frame escape. */ | |
4188 | break; | |
4189 | } | |
4190 | case BUILT_IN_ADJUST_TRAMPOLINE: | |
4191 | { | |
4192 | tree tramp = gimple_call_arg (t, 0); | |
4193 | tree res = gimple_call_lhs (t); | |
4194 | if (in_ipa_mode && res) | |
25a6a873 | 4195 | { |
e38811ce RG |
4196 | get_constraint_for (res, &lhsc); |
4197 | get_constraint_for (tramp, &rhsc); | |
4198 | do_deref (&rhsc); | |
4199 | process_all_all_constraints (lhsc, rhsc); | |
4200 | VEC_free (ce_s, heap, rhsc); | |
4201 | VEC_free (ce_s, heap, lhsc); | |
25a6a873 | 4202 | } |
e38811ce RG |
4203 | return true; |
4204 | } | |
0a35513e AH |
4205 | CASE_BUILT_IN_TM_STORE (1): |
4206 | CASE_BUILT_IN_TM_STORE (2): | |
4207 | CASE_BUILT_IN_TM_STORE (4): | |
4208 | CASE_BUILT_IN_TM_STORE (8): | |
4209 | CASE_BUILT_IN_TM_STORE (FLOAT): | |
4210 | CASE_BUILT_IN_TM_STORE (DOUBLE): | |
4211 | CASE_BUILT_IN_TM_STORE (LDOUBLE): | |
4212 | CASE_BUILT_IN_TM_STORE (M64): | |
4213 | CASE_BUILT_IN_TM_STORE (M128): | |
4214 | CASE_BUILT_IN_TM_STORE (M256): | |
4215 | { | |
4216 | tree addr = gimple_call_arg (t, 0); | |
4217 | tree src = gimple_call_arg (t, 1); | |
4218 | ||
4219 | get_constraint_for (addr, &lhsc); | |
4220 | do_deref (&lhsc); | |
4221 | get_constraint_for (src, &rhsc); | |
4222 | process_all_all_constraints (lhsc, rhsc); | |
4223 | VEC_free (ce_s, heap, lhsc); | |
4224 | VEC_free (ce_s, heap, rhsc); | |
4225 | return true; | |
4226 | } | |
4227 | CASE_BUILT_IN_TM_LOAD (1): | |
4228 | CASE_BUILT_IN_TM_LOAD (2): | |
4229 | CASE_BUILT_IN_TM_LOAD (4): | |
4230 | CASE_BUILT_IN_TM_LOAD (8): | |
4231 | CASE_BUILT_IN_TM_LOAD (FLOAT): | |
4232 | CASE_BUILT_IN_TM_LOAD (DOUBLE): | |
4233 | CASE_BUILT_IN_TM_LOAD (LDOUBLE): | |
4234 | CASE_BUILT_IN_TM_LOAD (M64): | |
4235 | CASE_BUILT_IN_TM_LOAD (M128): | |
4236 | CASE_BUILT_IN_TM_LOAD (M256): | |
4237 | { | |
4238 | tree dest = gimple_call_lhs (t); | |
4239 | tree addr = gimple_call_arg (t, 0); | |
4240 | ||
4241 | get_constraint_for (dest, &lhsc); | |
4242 | get_constraint_for (addr, &rhsc); | |
4243 | do_deref (&rhsc); | |
4244 | process_all_all_constraints (lhsc, rhsc); | |
4245 | VEC_free (ce_s, heap, lhsc); | |
4246 | VEC_free (ce_s, heap, rhsc); | |
4247 | return true; | |
4248 | } | |
e38811ce RG |
4249 | /* Variadic argument handling needs to be handled in IPA |
4250 | mode as well. */ | |
4251 | case BUILT_IN_VA_START: | |
4252 | { | |
df2f6100 RG |
4253 | tree valist = gimple_call_arg (t, 0); |
4254 | struct constraint_expr rhs, *lhsp; | |
4255 | unsigned i; | |
4256 | get_constraint_for (valist, &lhsc); | |
4257 | do_deref (&lhsc); | |
4258 | /* The va_list gets access to pointers in variadic | |
4259 | arguments. Which we know in the case of IPA analysis | |
4260 | and otherwise are just all nonlocal variables. */ | |
e38811ce | 4261 | if (in_ipa_mode) |
a4c9bc15 | 4262 | { |
e38811ce | 4263 | fi = lookup_vi_for_tree (cfun->decl); |
e38811ce RG |
4264 | rhs = get_function_part_constraint (fi, ~0); |
4265 | rhs.type = ADDRESSOF; | |
a4c9bc15 | 4266 | } |
df2f6100 RG |
4267 | else |
4268 | { | |
4269 | rhs.var = nonlocal_id; | |
4270 | rhs.type = ADDRESSOF; | |
4271 | rhs.offset = 0; | |
4272 | } | |
4273 | FOR_EACH_VEC_ELT (ce_s, lhsc, i, lhsp) | |
4274 | process_constraint (new_constraint (*lhsp, rhs)); | |
4275 | VEC_free (ce_s, heap, lhsc); | |
4276 | /* va_list is clobbered. */ | |
4277 | make_constraint_to (get_call_clobber_vi (t)->id, valist); | |
4278 | return true; | |
e38811ce RG |
4279 | } |
4280 | /* va_end doesn't have any effect that matters. */ | |
4281 | case BUILT_IN_VA_END: | |
4282 | return true; | |
4283 | /* Alternate return. Simply give up for now. */ | |
4284 | case BUILT_IN_RETURN: | |
4ee00913 | 4285 | { |
e38811ce RG |
4286 | fi = NULL; |
4287 | if (!in_ipa_mode | |
4288 | || !(fi = get_vi_for_tree (cfun->decl))) | |
4289 | make_constraint_from (get_varinfo (escaped_id), anything_id); | |
4290 | else if (in_ipa_mode | |
4291 | && fi != NULL) | |
b7091901 | 4292 | { |
e38811ce RG |
4293 | struct constraint_expr lhs, rhs; |
4294 | lhs = get_function_part_constraint (fi, fi_result); | |
4295 | rhs.var = anything_id; | |
4296 | rhs.offset = 0; | |
4297 | rhs.type = SCALAR; | |
4298 | process_constraint (new_constraint (lhs, rhs)); | |
b7091901 | 4299 | } |
e38811ce RG |
4300 | return true; |
4301 | } | |
4302 | /* printf-style functions may have hooks to set pointers to | |
4303 | point to somewhere into the generated string. Leave them | |
4304 | for a later excercise... */ | |
4305 | default: | |
4306 | /* Fallthru to general call handling. */; | |
4307 | } | |
4308 | ||
4309 | return false; | |
4310 | } | |
4311 | ||
4312 | /* Create constraints for the call T. */ | |
4313 | ||
4314 | static void | |
4315 | find_func_aliases_for_call (gimple t) | |
4316 | { | |
4317 | tree fndecl = gimple_call_fndecl (t); | |
4318 | VEC(ce_s, heap) *lhsc = NULL; | |
4319 | VEC(ce_s, heap) *rhsc = NULL; | |
4320 | varinfo_t fi; | |
4321 | ||
4322 | if (fndecl != NULL_TREE | |
4323 | && DECL_BUILT_IN (fndecl) | |
4324 | && find_func_aliases_for_builtin_call (t)) | |
4325 | return; | |
4326 | ||
5c04e9f4 | 4327 | fi = get_fi_for_callee (t); |
e38811ce | 4328 | if (!in_ipa_mode |
5c04e9f4 | 4329 | || (fndecl && !fi->is_fn_info)) |
e38811ce RG |
4330 | { |
4331 | VEC(ce_s, heap) *rhsc = NULL; | |
4332 | int flags = gimple_call_flags (t); | |
4333 | ||
4334 | /* Const functions can return their arguments and addresses | |
4335 | of global memory but not of escaped memory. */ | |
4336 | if (flags & (ECF_CONST|ECF_NOVOPS)) | |
4337 | { | |
cb89b4b0 | 4338 | if (gimple_call_lhs (t)) |
e38811ce | 4339 | handle_const_call (t, &rhsc); |
4ee00913 | 4340 | } |
e38811ce RG |
4341 | /* Pure functions can return addresses in and of memory |
4342 | reachable from their arguments, but they are not an escape | |
4343 | point for reachable memory of their arguments. */ | |
4344 | else if (flags & (ECF_PURE|ECF_LOOPING_CONST_OR_PURE)) | |
4345 | handle_pure_call (t, &rhsc); | |
4ee00913 | 4346 | else |
e38811ce RG |
4347 | handle_rhs_call (t, &rhsc); |
4348 | if (gimple_call_lhs (t)) | |
4349 | handle_lhs_call (t, gimple_call_lhs (t), flags, rhsc, fndecl); | |
4350 | VEC_free (ce_s, heap, rhsc); | |
4351 | } | |
4352 | else | |
4353 | { | |
4354 | tree lhsop; | |
4355 | unsigned j; | |
6e7e772d | 4356 | |
e38811ce RG |
4357 | /* Assign all the passed arguments to the appropriate incoming |
4358 | parameters of the function. */ | |
4359 | for (j = 0; j < gimple_call_num_args (t); j++) | |
4360 | { | |
4361 | struct constraint_expr lhs ; | |
4362 | struct constraint_expr *rhsp; | |
4363 | tree arg = gimple_call_arg (t, j); | |
7b765bed | 4364 | |
e38811ce RG |
4365 | get_constraint_for_rhs (arg, &rhsc); |
4366 | lhs = get_function_part_constraint (fi, fi_parm_base + j); | |
4367 | while (VEC_length (ce_s, rhsc) != 0) | |
4ee00913 | 4368 | { |
e38811ce RG |
4369 | rhsp = VEC_last (ce_s, rhsc); |
4370 | process_constraint (new_constraint (lhs, *rhsp)); | |
4371 | VEC_pop (ce_s, rhsc); | |
4ee00913 | 4372 | } |
e38811ce RG |
4373 | } |
4374 | ||
4375 | /* If we are returning a value, assign it to the result. */ | |
4376 | lhsop = gimple_call_lhs (t); | |
4377 | if (lhsop) | |
4378 | { | |
4379 | struct constraint_expr rhs; | |
4380 | struct constraint_expr *lhsp; | |
25a6a873 | 4381 | |
e38811ce RG |
4382 | get_constraint_for (lhsop, &lhsc); |
4383 | rhs = get_function_part_constraint (fi, fi_result); | |
4384 | if (fndecl | |
25a6a873 RG |
4385 | && DECL_RESULT (fndecl) |
4386 | && DECL_BY_REFERENCE (DECL_RESULT (fndecl))) | |
4387 | { | |
e38811ce RG |
4388 | VEC(ce_s, heap) *tem = NULL; |
4389 | VEC_safe_push (ce_s, heap, tem, &rhs); | |
4390 | do_deref (&tem); | |
4391 | rhs = *VEC_index (ce_s, tem, 0); | |
4392 | VEC_free(ce_s, heap, tem); | |
25a6a873 | 4393 | } |
e38811ce | 4394 | FOR_EACH_VEC_ELT (ce_s, lhsc, j, lhsp) |
5c04e9f4 | 4395 | process_constraint (new_constraint (*lhsp, rhs)); |
e38811ce | 4396 | } |
25a6a873 | 4397 | |
e38811ce RG |
4398 | /* If we pass the result decl by reference, honor that. */ |
4399 | if (lhsop | |
4400 | && fndecl | |
4401 | && DECL_RESULT (fndecl) | |
4402 | && DECL_BY_REFERENCE (DECL_RESULT (fndecl))) | |
4403 | { | |
4404 | struct constraint_expr lhs; | |
4405 | struct constraint_expr *rhsp; | |
4406 | ||
4407 | get_constraint_for_address_of (lhsop, &rhsc); | |
4408 | lhs = get_function_part_constraint (fi, fi_result); | |
4409 | FOR_EACH_VEC_ELT (ce_s, rhsc, j, rhsp) | |
5c04e9f4 | 4410 | process_constraint (new_constraint (lhs, *rhsp)); |
e38811ce RG |
4411 | VEC_free (ce_s, heap, rhsc); |
4412 | } | |
25a6a873 | 4413 | |
e38811ce RG |
4414 | /* If we use a static chain, pass it along. */ |
4415 | if (gimple_call_chain (t)) | |
4416 | { | |
4417 | struct constraint_expr lhs; | |
4418 | struct constraint_expr *rhsp; | |
4419 | ||
4420 | get_constraint_for (gimple_call_chain (t), &rhsc); | |
4421 | lhs = get_function_part_constraint (fi, fi_static_chain); | |
4422 | FOR_EACH_VEC_ELT (ce_s, rhsc, j, rhsp) | |
5c04e9f4 | 4423 | process_constraint (new_constraint (lhs, *rhsp)); |
e38811ce RG |
4424 | } |
4425 | } | |
4426 | } | |
4427 | ||
4428 | /* Walk statement T setting up aliasing constraints according to the | |
4429 | references found in T. This function is the main part of the | |
4430 | constraint builder. AI points to auxiliary alias information used | |
4431 | when building alias sets and computing alias grouping heuristics. */ | |
4432 | ||
4433 | static void | |
4434 | find_func_aliases (gimple origt) | |
4435 | { | |
4436 | gimple t = origt; | |
4437 | VEC(ce_s, heap) *lhsc = NULL; | |
4438 | VEC(ce_s, heap) *rhsc = NULL; | |
4439 | struct constraint_expr *c; | |
4440 | varinfo_t fi; | |
4441 | ||
4442 | /* Now build constraints expressions. */ | |
4443 | if (gimple_code (t) == GIMPLE_PHI) | |
4444 | { | |
4445 | size_t i; | |
4446 | unsigned int j; | |
4447 | ||
4448 | /* For a phi node, assign all the arguments to | |
4449 | the result. */ | |
4450 | get_constraint_for (gimple_phi_result (t), &lhsc); | |
4451 | for (i = 0; i < gimple_phi_num_args (t); i++) | |
4452 | { | |
4453 | tree strippedrhs = PHI_ARG_DEF (t, i); | |
4454 | ||
4455 | STRIP_NOPS (strippedrhs); | |
4456 | get_constraint_for_rhs (gimple_phi_arg_def (t, i), &rhsc); | |
4457 | ||
4458 | FOR_EACH_VEC_ELT (ce_s, lhsc, j, c) | |
4459 | { | |
4460 | struct constraint_expr *c2; | |
4461 | while (VEC_length (ce_s, rhsc) > 0) | |
4462 | { | |
4463 | c2 = VEC_last (ce_s, rhsc); | |
4464 | process_constraint (new_constraint (*c, *c2)); | |
4465 | VEC_pop (ce_s, rhsc); | |
4466 | } | |
25a6a873 | 4467 | } |
c58936b6 | 4468 | } |
e8ca4159 | 4469 | } |
e38811ce RG |
4470 | /* In IPA mode, we need to generate constraints to pass call |
4471 | arguments through their calls. There are two cases, | |
4472 | either a GIMPLE_CALL returning a value, or just a plain | |
4473 | GIMPLE_CALL when we are not. | |
4474 | ||
4475 | In non-ipa mode, we need to generate constraints for each | |
4476 | pointer passed by address. */ | |
4477 | else if (is_gimple_call (t)) | |
4478 | find_func_aliases_for_call (t); | |
4479 | ||
e5bae89b RG |
4480 | /* Otherwise, just a regular assignment statement. Only care about |
4481 | operations with pointer result, others are dealt with as escape | |
4482 | points if they have pointer operands. */ | |
0f8d6231 | 4483 | else if (is_gimple_assign (t)) |
e8ca4159 | 4484 | { |
726a989a RB |
4485 | /* Otherwise, just a regular assignment statement. */ |
4486 | tree lhsop = gimple_assign_lhs (t); | |
4487 | tree rhsop = (gimple_num_ops (t) == 2) ? gimple_assign_rhs1 (t) : NULL; | |
e8ca4159 | 4488 | |
47598145 MM |
4489 | if (rhsop && TREE_CLOBBER_P (rhsop)) |
4490 | /* Ignore clobbers, they don't actually store anything into | |
4491 | the LHS. */ | |
4492 | ; | |
4493 | else if (rhsop && AGGREGATE_TYPE_P (TREE_TYPE (lhsop))) | |
e5bae89b | 4494 | do_structure_copy (lhsop, rhsop); |
e8ca4159 DN |
4495 | else |
4496 | { | |
194313e2 RG |
4497 | enum tree_code code = gimple_assign_rhs_code (t); |
4498 | ||
e5bae89b | 4499 | get_constraint_for (lhsop, &lhsc); |
726a989a | 4500 | |
194313e2 | 4501 | if (code == POINTER_PLUS_EXPR) |
726a989a RB |
4502 | get_constraint_for_ptr_offset (gimple_assign_rhs1 (t), |
4503 | gimple_assign_rhs2 (t), &rhsc); | |
194313e2 | 4504 | else if (code == BIT_AND_EXPR |
fca821b5 RG |
4505 | && TREE_CODE (gimple_assign_rhs2 (t)) == INTEGER_CST) |
4506 | { | |
4507 | /* Aligning a pointer via a BIT_AND_EXPR is offsetting | |
4508 | the pointer. Handle it by offsetting it by UNKNOWN. */ | |
4509 | get_constraint_for_ptr_offset (gimple_assign_rhs1 (t), | |
4510 | NULL_TREE, &rhsc); | |
4511 | } | |
194313e2 | 4512 | else if ((CONVERT_EXPR_CODE_P (code) |
1961418e RG |
4513 | && !(POINTER_TYPE_P (gimple_expr_type (t)) |
4514 | && !POINTER_TYPE_P (TREE_TYPE (rhsop)))) | |
4515 | || gimple_assign_single_p (t)) | |
ed6c4831 | 4516 | get_constraint_for_rhs (rhsop, &rhsc); |
194313e2 RG |
4517 | else if (truth_value_p (code)) |
4518 | /* Truth value results are not pointer (parts). Or at least | |
4519 | very very unreasonable obfuscation of a part. */ | |
4520 | ; | |
726a989a RB |
4521 | else |
4522 | { | |
0f8d6231 RG |
4523 | /* All other operations are merges. */ |
4524 | VEC (ce_s, heap) *tmp = NULL; | |
4525 | struct constraint_expr *rhsp; | |
4526 | unsigned i, j; | |
4527 | get_constraint_for_rhs (gimple_assign_rhs1 (t), &rhsc); | |
4528 | for (i = 2; i < gimple_num_ops (t); ++i) | |
4529 | { | |
4530 | get_constraint_for_rhs (gimple_op (t, i), &tmp); | |
4531 | FOR_EACH_VEC_ELT (ce_s, tmp, j, rhsp) | |
4532 | VEC_safe_push (ce_s, heap, rhsc, rhsp); | |
4533 | VEC_truncate (ce_s, tmp, 0); | |
4534 | } | |
4535 | VEC_free (ce_s, heap, tmp); | |
726a989a | 4536 | } |
779704e7 | 4537 | process_all_all_constraints (lhsc, rhsc); |
e8ca4159 | 4538 | } |
de70bb20 RG |
4539 | /* If there is a store to a global variable the rhs escapes. */ |
4540 | if ((lhsop = get_base_address (lhsop)) != NULL_TREE | |
4541 | && DECL_P (lhsop) | |
25a6a873 RG |
4542 | && is_global_var (lhsop) |
4543 | && (!in_ipa_mode | |
4544 | || DECL_EXTERNAL (lhsop) || TREE_PUBLIC (lhsop))) | |
de70bb20 | 4545 | make_escape_constraint (rhsop); |
910fdc79 | 4546 | } |
14c41b9b RG |
4547 | /* Handle escapes through return. */ |
4548 | else if (gimple_code (t) == GIMPLE_RETURN | |
0f8d6231 | 4549 | && gimple_return_retval (t) != NULL_TREE) |
14c41b9b | 4550 | { |
25a6a873 RG |
4551 | fi = NULL; |
4552 | if (!in_ipa_mode | |
4553 | || !(fi = get_vi_for_tree (cfun->decl))) | |
4554 | make_escape_constraint (gimple_return_retval (t)); | |
4555 | else if (in_ipa_mode | |
4556 | && fi != NULL) | |
4557 | { | |
4558 | struct constraint_expr lhs ; | |
4559 | struct constraint_expr *rhsp; | |
4560 | unsigned i; | |
4561 | ||
4562 | lhs = get_function_part_constraint (fi, fi_result); | |
ed6c4831 | 4563 | get_constraint_for_rhs (gimple_return_retval (t), &rhsc); |
ac47786e | 4564 | FOR_EACH_VEC_ELT (ce_s, rhsc, i, rhsp) |
25a6a873 RG |
4565 | process_constraint (new_constraint (lhs, *rhsp)); |
4566 | } | |
14c41b9b | 4567 | } |
2e407842 RG |
4568 | /* Handle asms conservatively by adding escape constraints to everything. */ |
4569 | else if (gimple_code (t) == GIMPLE_ASM) | |
b7091901 | 4570 | { |
5006671f RG |
4571 | unsigned i, noutputs; |
4572 | const char **oconstraints; | |
4573 | const char *constraint; | |
4574 | bool allows_mem, allows_reg, is_inout; | |
4575 | ||
4576 | noutputs = gimple_asm_noutputs (t); | |
4577 | oconstraints = XALLOCAVEC (const char *, noutputs); | |
4578 | ||
4579 | for (i = 0; i < noutputs; ++i) | |
b7091901 | 4580 | { |
5006671f RG |
4581 | tree link = gimple_asm_output_op (t, i); |
4582 | tree op = TREE_VALUE (link); | |
4583 | ||
4584 | constraint = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link))); | |
4585 | oconstraints[i] = constraint; | |
4586 | parse_output_constraint (&constraint, i, 0, 0, &allows_mem, | |
4587 | &allows_reg, &is_inout); | |
4588 | ||
4589 | /* A memory constraint makes the address of the operand escape. */ | |
4590 | if (!allows_reg && allows_mem) | |
4591 | make_escape_constraint (build_fold_addr_expr (op)); | |
4592 | ||
4593 | /* The asm may read global memory, so outputs may point to | |
4594 | any global memory. */ | |
0f8d6231 | 4595 | if (op) |
5006671f RG |
4596 | { |
4597 | VEC(ce_s, heap) *lhsc = NULL; | |
4598 | struct constraint_expr rhsc, *lhsp; | |
4599 | unsigned j; | |
4600 | get_constraint_for (op, &lhsc); | |
4601 | rhsc.var = nonlocal_id; | |
4602 | rhsc.offset = 0; | |
4603 | rhsc.type = SCALAR; | |
ac47786e | 4604 | FOR_EACH_VEC_ELT (ce_s, lhsc, j, lhsp) |
5006671f RG |
4605 | process_constraint (new_constraint (*lhsp, rhsc)); |
4606 | VEC_free (ce_s, heap, lhsc); | |
4607 | } | |
b7091901 | 4608 | } |
726a989a | 4609 | for (i = 0; i < gimple_asm_ninputs (t); ++i) |
b7091901 | 4610 | { |
5006671f RG |
4611 | tree link = gimple_asm_input_op (t, i); |
4612 | tree op = TREE_VALUE (link); | |
4613 | ||
4614 | constraint = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link))); | |
4615 | ||
4616 | parse_input_constraint (&constraint, 0, 0, noutputs, 0, oconstraints, | |
4617 | &allows_mem, &allows_reg); | |
4618 | ||
4619 | /* A memory constraint makes the address of the operand escape. */ | |
4620 | if (!allows_reg && allows_mem) | |
4621 | make_escape_constraint (build_fold_addr_expr (op)); | |
4622 | /* Strictly we'd only need the constraint to ESCAPED if | |
3e8542ca RG |
4623 | the asm clobbers memory, otherwise using something |
4624 | along the lines of per-call clobbers/uses would be enough. */ | |
0f8d6231 | 4625 | else if (op) |
b7091901 RG |
4626 | make_escape_constraint (op); |
4627 | } | |
4628 | } | |
4629 | ||
4ee00913 DB |
4630 | VEC_free (ce_s, heap, rhsc); |
4631 | VEC_free (ce_s, heap, lhsc); | |
910fdc79 DB |
4632 | } |
4633 | ||
4634 | ||
25a6a873 RG |
4635 | /* Create a constraint adding to the clobber set of FI the memory |
4636 | pointed to by PTR. */ | |
4637 | ||
4638 | static void | |
4639 | process_ipa_clobber (varinfo_t fi, tree ptr) | |
4640 | { | |
4641 | VEC(ce_s, heap) *ptrc = NULL; | |
4642 | struct constraint_expr *c, lhs; | |
4643 | unsigned i; | |
ed6c4831 | 4644 | get_constraint_for_rhs (ptr, &ptrc); |
25a6a873 | 4645 | lhs = get_function_part_constraint (fi, fi_clobbers); |
ac47786e | 4646 | FOR_EACH_VEC_ELT (ce_s, ptrc, i, c) |
25a6a873 RG |
4647 | process_constraint (new_constraint (lhs, *c)); |
4648 | VEC_free (ce_s, heap, ptrc); | |
4649 | } | |
4650 | ||
4651 | /* Walk statement T setting up clobber and use constraints according to the | |
4652 | references found in T. This function is a main part of the | |
4653 | IPA constraint builder. */ | |
4654 | ||
4655 | static void | |
4656 | find_func_clobbers (gimple origt) | |
4657 | { | |
4658 | gimple t = origt; | |
4659 | VEC(ce_s, heap) *lhsc = NULL; | |
4660 | VEC(ce_s, heap) *rhsc = NULL; | |
4661 | varinfo_t fi; | |
4662 | ||
4663 | /* Add constraints for clobbered/used in IPA mode. | |
4664 | We are not interested in what automatic variables are clobbered | |
4665 | or used as we only use the information in the caller to which | |
4666 | they do not escape. */ | |
4667 | gcc_assert (in_ipa_mode); | |
4668 | ||
4669 | /* If the stmt refers to memory in any way it better had a VUSE. */ | |
4670 | if (gimple_vuse (t) == NULL_TREE) | |
4671 | return; | |
4672 | ||
4673 | /* We'd better have function information for the current function. */ | |
4674 | fi = lookup_vi_for_tree (cfun->decl); | |
4675 | gcc_assert (fi != NULL); | |
4676 | ||
4677 | /* Account for stores in assignments and calls. */ | |
4678 | if (gimple_vdef (t) != NULL_TREE | |
4679 | && gimple_has_lhs (t)) | |
4680 | { | |
4681 | tree lhs = gimple_get_lhs (t); | |
4682 | tree tem = lhs; | |
4683 | while (handled_component_p (tem)) | |
4684 | tem = TREE_OPERAND (tem, 0); | |
4685 | if ((DECL_P (tem) | |
4686 | && !auto_var_in_fn_p (tem, cfun->decl)) | |
70f34814 RG |
4687 | || INDIRECT_REF_P (tem) |
4688 | || (TREE_CODE (tem) == MEM_REF | |
4689 | && !(TREE_CODE (TREE_OPERAND (tem, 0)) == ADDR_EXPR | |
4690 | && auto_var_in_fn_p | |
4691 | (TREE_OPERAND (TREE_OPERAND (tem, 0), 0), cfun->decl)))) | |
25a6a873 RG |
4692 | { |
4693 | struct constraint_expr lhsc, *rhsp; | |
4694 | unsigned i; | |
4695 | lhsc = get_function_part_constraint (fi, fi_clobbers); | |
4696 | get_constraint_for_address_of (lhs, &rhsc); | |
ac47786e | 4697 | FOR_EACH_VEC_ELT (ce_s, rhsc, i, rhsp) |
25a6a873 RG |
4698 | process_constraint (new_constraint (lhsc, *rhsp)); |
4699 | VEC_free (ce_s, heap, rhsc); | |
4700 | } | |
4701 | } | |
4702 | ||
4703 | /* Account for uses in assigments and returns. */ | |
4704 | if (gimple_assign_single_p (t) | |
4705 | || (gimple_code (t) == GIMPLE_RETURN | |
4706 | && gimple_return_retval (t) != NULL_TREE)) | |
4707 | { | |
4708 | tree rhs = (gimple_assign_single_p (t) | |
4709 | ? gimple_assign_rhs1 (t) : gimple_return_retval (t)); | |
4710 | tree tem = rhs; | |
4711 | while (handled_component_p (tem)) | |
4712 | tem = TREE_OPERAND (tem, 0); | |
4713 | if ((DECL_P (tem) | |
4714 | && !auto_var_in_fn_p (tem, cfun->decl)) | |
70f34814 RG |
4715 | || INDIRECT_REF_P (tem) |
4716 | || (TREE_CODE (tem) == MEM_REF | |
4717 | && !(TREE_CODE (TREE_OPERAND (tem, 0)) == ADDR_EXPR | |
4718 | && auto_var_in_fn_p | |
4719 | (TREE_OPERAND (TREE_OPERAND (tem, 0), 0), cfun->decl)))) | |
25a6a873 RG |
4720 | { |
4721 | struct constraint_expr lhs, *rhsp; | |
4722 | unsigned i; | |
4723 | lhs = get_function_part_constraint (fi, fi_uses); | |
4724 | get_constraint_for_address_of (rhs, &rhsc); | |
ac47786e | 4725 | FOR_EACH_VEC_ELT (ce_s, rhsc, i, rhsp) |
25a6a873 RG |
4726 | process_constraint (new_constraint (lhs, *rhsp)); |
4727 | VEC_free (ce_s, heap, rhsc); | |
4728 | } | |
4729 | } | |
4730 | ||
4731 | if (is_gimple_call (t)) | |
4732 | { | |
4733 | varinfo_t cfi = NULL; | |
4734 | tree decl = gimple_call_fndecl (t); | |
4735 | struct constraint_expr lhs, rhs; | |
4736 | unsigned i, j; | |
4737 | ||
4738 | /* For builtins we do not have separate function info. For those | |
4739 | we do not generate escapes for we have to generate clobbers/uses. */ | |
4740 | if (decl | |
4741 | && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL) | |
4742 | switch (DECL_FUNCTION_CODE (decl)) | |
4743 | { | |
4744 | /* The following functions use and clobber memory pointed to | |
4745 | by their arguments. */ | |
4746 | case BUILT_IN_STRCPY: | |
4747 | case BUILT_IN_STRNCPY: | |
4748 | case BUILT_IN_BCOPY: | |
4749 | case BUILT_IN_MEMCPY: | |
4750 | case BUILT_IN_MEMMOVE: | |
4751 | case BUILT_IN_MEMPCPY: | |
4752 | case BUILT_IN_STPCPY: | |
4753 | case BUILT_IN_STPNCPY: | |
4754 | case BUILT_IN_STRCAT: | |
4755 | case BUILT_IN_STRNCAT: | |
36dc1a88 JJ |
4756 | case BUILT_IN_STRCPY_CHK: |
4757 | case BUILT_IN_STRNCPY_CHK: | |
4758 | case BUILT_IN_MEMCPY_CHK: | |
4759 | case BUILT_IN_MEMMOVE_CHK: | |
4760 | case BUILT_IN_MEMPCPY_CHK: | |
4761 | case BUILT_IN_STPCPY_CHK: | |
f3fc9b80 | 4762 | case BUILT_IN_STPNCPY_CHK: |
36dc1a88 JJ |
4763 | case BUILT_IN_STRCAT_CHK: |
4764 | case BUILT_IN_STRNCAT_CHK: | |
25a6a873 RG |
4765 | { |
4766 | tree dest = gimple_call_arg (t, (DECL_FUNCTION_CODE (decl) | |
4767 | == BUILT_IN_BCOPY ? 1 : 0)); | |
4768 | tree src = gimple_call_arg (t, (DECL_FUNCTION_CODE (decl) | |
4769 | == BUILT_IN_BCOPY ? 0 : 1)); | |
4770 | unsigned i; | |
4771 | struct constraint_expr *rhsp, *lhsp; | |
4772 | get_constraint_for_ptr_offset (dest, NULL_TREE, &lhsc); | |
4773 | lhs = get_function_part_constraint (fi, fi_clobbers); | |
ac47786e | 4774 | FOR_EACH_VEC_ELT (ce_s, lhsc, i, lhsp) |
25a6a873 RG |
4775 | process_constraint (new_constraint (lhs, *lhsp)); |
4776 | VEC_free (ce_s, heap, lhsc); | |
4777 | get_constraint_for_ptr_offset (src, NULL_TREE, &rhsc); | |
4778 | lhs = get_function_part_constraint (fi, fi_uses); | |
ac47786e | 4779 | FOR_EACH_VEC_ELT (ce_s, rhsc, i, rhsp) |
25a6a873 RG |
4780 | process_constraint (new_constraint (lhs, *rhsp)); |
4781 | VEC_free (ce_s, heap, rhsc); | |
4782 | return; | |
4783 | } | |
4784 | /* The following function clobbers memory pointed to by | |
4785 | its argument. */ | |
4786 | case BUILT_IN_MEMSET: | |
36dc1a88 | 4787 | case BUILT_IN_MEMSET_CHK: |
25a6a873 RG |
4788 | { |
4789 | tree dest = gimple_call_arg (t, 0); | |
4790 | unsigned i; | |
4791 | ce_s *lhsp; | |
4792 | get_constraint_for_ptr_offset (dest, NULL_TREE, &lhsc); | |
4793 | lhs = get_function_part_constraint (fi, fi_clobbers); | |
ac47786e | 4794 | FOR_EACH_VEC_ELT (ce_s, lhsc, i, lhsp) |
25a6a873 RG |
4795 | process_constraint (new_constraint (lhs, *lhsp)); |
4796 | VEC_free (ce_s, heap, lhsc); | |
4797 | return; | |
4798 | } | |
4799 | /* The following functions clobber their second and third | |
4800 | arguments. */ | |
4801 | case BUILT_IN_SINCOS: | |
4802 | case BUILT_IN_SINCOSF: | |
4803 | case BUILT_IN_SINCOSL: | |
4804 | { | |
4805 | process_ipa_clobber (fi, gimple_call_arg (t, 1)); | |
4806 | process_ipa_clobber (fi, gimple_call_arg (t, 2)); | |
4807 | return; | |
4808 | } | |
4809 | /* The following functions clobber their second argument. */ | |
4810 | case BUILT_IN_FREXP: | |
4811 | case BUILT_IN_FREXPF: | |
4812 | case BUILT_IN_FREXPL: | |
4813 | case BUILT_IN_LGAMMA_R: | |
4814 | case BUILT_IN_LGAMMAF_R: | |
4815 | case BUILT_IN_LGAMMAL_R: | |
4816 | case BUILT_IN_GAMMA_R: | |
4817 | case BUILT_IN_GAMMAF_R: | |
4818 | case BUILT_IN_GAMMAL_R: | |
4819 | case BUILT_IN_MODF: | |
4820 | case BUILT_IN_MODFF: | |
4821 | case BUILT_IN_MODFL: | |
4822 | { | |
4823 | process_ipa_clobber (fi, gimple_call_arg (t, 1)); | |
4824 | return; | |
4825 | } | |
4826 | /* The following functions clobber their third argument. */ | |
4827 | case BUILT_IN_REMQUO: | |
4828 | case BUILT_IN_REMQUOF: | |
4829 | case BUILT_IN_REMQUOL: | |
4830 | { | |
4831 | process_ipa_clobber (fi, gimple_call_arg (t, 2)); | |
4832 | return; | |
4833 | } | |
4834 | /* The following functions neither read nor clobber memory. */ | |
45d439ac | 4835 | case BUILT_IN_ASSUME_ALIGNED: |
25a6a873 RG |
4836 | case BUILT_IN_FREE: |
4837 | return; | |
4838 | /* Trampolines are of no interest to us. */ | |
4839 | case BUILT_IN_INIT_TRAMPOLINE: | |
4840 | case BUILT_IN_ADJUST_TRAMPOLINE: | |
4841 | return; | |
4842 | case BUILT_IN_VA_START: | |
4843 | case BUILT_IN_VA_END: | |
4844 | return; | |
4845 | /* printf-style functions may have hooks to set pointers to | |
4846 | point to somewhere into the generated string. Leave them | |
4847 | for a later excercise... */ | |
4848 | default: | |
4849 | /* Fallthru to general call handling. */; | |
4850 | } | |
4851 | ||
4852 | /* Parameters passed by value are used. */ | |
4853 | lhs = get_function_part_constraint (fi, fi_uses); | |
4854 | for (i = 0; i < gimple_call_num_args (t); i++) | |
4855 | { | |
4856 | struct constraint_expr *rhsp; | |
4857 | tree arg = gimple_call_arg (t, i); | |
4858 | ||
4859 | if (TREE_CODE (arg) == SSA_NAME | |
4860 | || is_gimple_min_invariant (arg)) | |
4861 | continue; | |
4862 | ||
4863 | get_constraint_for_address_of (arg, &rhsc); | |
ac47786e | 4864 | FOR_EACH_VEC_ELT (ce_s, rhsc, j, rhsp) |
25a6a873 RG |
4865 | process_constraint (new_constraint (lhs, *rhsp)); |
4866 | VEC_free (ce_s, heap, rhsc); | |
4867 | } | |
4868 | ||
4869 | /* Build constraints for propagating clobbers/uses along the | |
4870 | callgraph edges. */ | |
4871 | cfi = get_fi_for_callee (t); | |
4872 | if (cfi->id == anything_id) | |
4873 | { | |
4874 | if (gimple_vdef (t)) | |
4875 | make_constraint_from (first_vi_for_offset (fi, fi_clobbers), | |
4876 | anything_id); | |
4877 | make_constraint_from (first_vi_for_offset (fi, fi_uses), | |
4878 | anything_id); | |
4879 | return; | |
4880 | } | |
4881 | ||
4882 | /* For callees without function info (that's external functions), | |
4883 | ESCAPED is clobbered and used. */ | |
4884 | if (gimple_call_fndecl (t) | |
4885 | && !cfi->is_fn_info) | |
4886 | { | |
4887 | varinfo_t vi; | |
4888 | ||
4889 | if (gimple_vdef (t)) | |
4890 | make_copy_constraint (first_vi_for_offset (fi, fi_clobbers), | |
4891 | escaped_id); | |
4892 | make_copy_constraint (first_vi_for_offset (fi, fi_uses), escaped_id); | |
4893 | ||
4894 | /* Also honor the call statement use/clobber info. */ | |
4895 | if ((vi = lookup_call_clobber_vi (t)) != NULL) | |
4896 | make_copy_constraint (first_vi_for_offset (fi, fi_clobbers), | |
4897 | vi->id); | |
4898 | if ((vi = lookup_call_use_vi (t)) != NULL) | |
4899 | make_copy_constraint (first_vi_for_offset (fi, fi_uses), | |
4900 | vi->id); | |
4901 | return; | |
4902 | } | |
4903 | ||
4904 | /* Otherwise the caller clobbers and uses what the callee does. | |
4905 | ??? This should use a new complex constraint that filters | |
4906 | local variables of the callee. */ | |
4907 | if (gimple_vdef (t)) | |
4908 | { | |
4909 | lhs = get_function_part_constraint (fi, fi_clobbers); | |
4910 | rhs = get_function_part_constraint (cfi, fi_clobbers); | |
4911 | process_constraint (new_constraint (lhs, rhs)); | |
4912 | } | |
4913 | lhs = get_function_part_constraint (fi, fi_uses); | |
4914 | rhs = get_function_part_constraint (cfi, fi_uses); | |
4915 | process_constraint (new_constraint (lhs, rhs)); | |
4916 | } | |
4917 | else if (gimple_code (t) == GIMPLE_ASM) | |
4918 | { | |
4919 | /* ??? Ick. We can do better. */ | |
4920 | if (gimple_vdef (t)) | |
4921 | make_constraint_from (first_vi_for_offset (fi, fi_clobbers), | |
4922 | anything_id); | |
4923 | make_constraint_from (first_vi_for_offset (fi, fi_uses), | |
4924 | anything_id); | |
4925 | } | |
4926 | ||
4927 | VEC_free (ce_s, heap, rhsc); | |
4928 | } | |
4929 | ||
4930 | ||
910fdc79 | 4931 | /* Find the first varinfo in the same variable as START that overlaps with |
5006671f | 4932 | OFFSET. Return NULL if we can't find one. */ |
910fdc79 | 4933 | |
c58936b6 | 4934 | static varinfo_t |
910fdc79 DB |
4935 | first_vi_for_offset (varinfo_t start, unsigned HOST_WIDE_INT offset) |
4936 | { | |
5006671f RG |
4937 | /* If the offset is outside of the variable, bail out. */ |
4938 | if (offset >= start->fullsize) | |
4939 | return NULL; | |
4940 | ||
4941 | /* If we cannot reach offset from start, lookup the first field | |
4942 | and start from there. */ | |
4943 | if (start->offset > offset) | |
4944 | start = lookup_vi_for_tree (start->decl); | |
4945 | ||
4946 | while (start) | |
910fdc79 DB |
4947 | { |
4948 | /* We may not find a variable in the field list with the actual | |
4949 | offset when when we have glommed a structure to a variable. | |
4950 | In that case, however, offset should still be within the size | |
4951 | of the variable. */ | |
5006671f | 4952 | if (offset >= start->offset |
de925a03 | 4953 | && (offset - start->offset) < start->size) |
5006671f RG |
4954 | return start; |
4955 | ||
4956 | start= start->next; | |
910fdc79 | 4957 | } |
5006671f | 4958 | |
8971094d | 4959 | return NULL; |
910fdc79 DB |
4960 | } |
4961 | ||
5006671f RG |
4962 | /* Find the first varinfo in the same variable as START that overlaps with |
4963 | OFFSET. If there is no such varinfo the varinfo directly preceding | |
4964 | OFFSET is returned. */ | |
4965 | ||
4966 | static varinfo_t | |
4967 | first_or_preceding_vi_for_offset (varinfo_t start, | |
4968 | unsigned HOST_WIDE_INT offset) | |
4969 | { | |
4970 | /* If we cannot reach offset from start, lookup the first field | |
4971 | and start from there. */ | |
4972 | if (start->offset > offset) | |
4973 | start = lookup_vi_for_tree (start->decl); | |
4974 | ||
4975 | /* We may not find a variable in the field list with the actual | |
4976 | offset when when we have glommed a structure to a variable. | |
4977 | In that case, however, offset should still be within the size | |
4978 | of the variable. | |
4979 | If we got beyond the offset we look for return the field | |
4980 | directly preceding offset which may be the last field. */ | |
4981 | while (start->next | |
4982 | && offset >= start->offset | |
de925a03 | 4983 | && !((offset - start->offset) < start->size)) |
5006671f RG |
4984 | start = start->next; |
4985 | ||
4986 | return start; | |
4987 | } | |
4988 | ||
910fdc79 | 4989 | |
31de5b77 RG |
4990 | /* This structure is used during pushing fields onto the fieldstack |
4991 | to track the offset of the field, since bitpos_of_field gives it | |
4992 | relative to its immediate containing type, and we want it relative | |
4993 | to the ultimate containing object. */ | |
4994 | ||
4995 | struct fieldoff | |
4996 | { | |
ee7d4b57 RG |
4997 | /* Offset from the base of the base containing object to this field. */ |
4998 | HOST_WIDE_INT offset; | |
31de5b77 RG |
4999 | |
5000 | /* Size, in bits, of the field. */ | |
ee7d4b57 | 5001 | unsigned HOST_WIDE_INT size; |
31de5b77 | 5002 | |
ee7d4b57 | 5003 | unsigned has_unknown_size : 1; |
31de5b77 | 5004 | |
0f8d6231 RG |
5005 | unsigned must_have_pointers : 1; |
5006 | ||
ee7d4b57 | 5007 | unsigned may_have_pointers : 1; |
74d27244 RG |
5008 | |
5009 | unsigned only_restrict_pointers : 1; | |
31de5b77 RG |
5010 | }; |
5011 | typedef struct fieldoff fieldoff_s; | |
5012 | ||
5013 | DEF_VEC_O(fieldoff_s); | |
5014 | DEF_VEC_ALLOC_O(fieldoff_s,heap); | |
5015 | ||
910fdc79 DB |
5016 | /* qsort comparison function for two fieldoff's PA and PB */ |
5017 | ||
c58936b6 | 5018 | static int |
910fdc79 DB |
5019 | fieldoff_compare (const void *pa, const void *pb) |
5020 | { | |
5021 | const fieldoff_s *foa = (const fieldoff_s *)pa; | |
5022 | const fieldoff_s *fob = (const fieldoff_s *)pb; | |
185ab3b6 | 5023 | unsigned HOST_WIDE_INT foasize, fobsize; |
c58936b6 | 5024 | |
185ab3b6 RG |
5025 | if (foa->offset < fob->offset) |
5026 | return -1; | |
5027 | else if (foa->offset > fob->offset) | |
5028 | return 1; | |
910fdc79 | 5029 | |
ee7d4b57 RG |
5030 | foasize = foa->size; |
5031 | fobsize = fob->size; | |
185ab3b6 | 5032 | if (foasize < fobsize) |
ee7d4b57 | 5033 | return -1; |
185ab3b6 RG |
5034 | else if (foasize > fobsize) |
5035 | return 1; | |
5036 | return 0; | |
910fdc79 DB |
5037 | } |
5038 | ||
5039 | /* Sort a fieldstack according to the field offset and sizes. */ | |
31de5b77 | 5040 | static void |
83f676b3 | 5041 | sort_fieldstack (VEC(fieldoff_s,heap) *fieldstack) |
910fdc79 | 5042 | { |
5095da95 | 5043 | VEC_qsort (fieldoff_s, fieldstack, fieldoff_compare); |
910fdc79 DB |
5044 | } |
5045 | ||
b4cf8c9d RG |
5046 | /* Return true if T is a type that can have subvars. */ |
5047 | ||
5048 | static inline bool | |
5049 | type_can_have_subvars (const_tree t) | |
5050 | { | |
5051 | /* Aggregates without overlapping fields can have subvars. */ | |
5052 | return TREE_CODE (t) == RECORD_TYPE; | |
5053 | } | |
5054 | ||
31de5b77 RG |
5055 | /* Return true if V is a tree that we can have subvars for. |
5056 | Normally, this is any aggregate type. Also complex | |
5057 | types which are not gimple registers can have subvars. */ | |
5058 | ||
5059 | static inline bool | |
5060 | var_can_have_subvars (const_tree v) | |
5061 | { | |
5062 | /* Volatile variables should never have subvars. */ | |
5063 | if (TREE_THIS_VOLATILE (v)) | |
5064 | return false; | |
5065 | ||
5066 | /* Non decls or memory tags can never have subvars. */ | |
5006671f | 5067 | if (!DECL_P (v)) |
31de5b77 RG |
5068 | return false; |
5069 | ||
b4cf8c9d | 5070 | return type_can_have_subvars (TREE_TYPE (v)); |
31de5b77 RG |
5071 | } |
5072 | ||
0f8d6231 RG |
5073 | /* Return true if T is a type that does contain pointers. */ |
5074 | ||
5075 | static bool | |
5076 | type_must_have_pointers (tree type) | |
5077 | { | |
5078 | if (POINTER_TYPE_P (type)) | |
5079 | return true; | |
5080 | ||
5081 | if (TREE_CODE (type) == ARRAY_TYPE) | |
5082 | return type_must_have_pointers (TREE_TYPE (type)); | |
5083 | ||
5084 | /* A function or method can have pointers as arguments, so track | |
5085 | those separately. */ | |
5086 | if (TREE_CODE (type) == FUNCTION_TYPE | |
5087 | || TREE_CODE (type) == METHOD_TYPE) | |
5088 | return true; | |
5089 | ||
5090 | return false; | |
5091 | } | |
5092 | ||
5093 | static bool | |
5094 | field_must_have_pointers (tree t) | |
5095 | { | |
5096 | return type_must_have_pointers (TREE_TYPE (t)); | |
5097 | } | |
5098 | ||
d7705551 DN |
5099 | /* Given a TYPE, and a vector of field offsets FIELDSTACK, push all |
5100 | the fields of TYPE onto fieldstack, recording their offsets along | |
5101 | the way. | |
5102 | ||
5103 | OFFSET is used to keep track of the offset in this entire | |
5104 | structure, rather than just the immediately containing structure. | |
18abb35e RG |
5105 | Returns false if the caller is supposed to handle the field we |
5106 | recursed for. */ | |
910fdc79 | 5107 | |
18abb35e | 5108 | static bool |
c58936b6 | 5109 | push_fields_onto_fieldstack (tree type, VEC(fieldoff_s,heap) **fieldstack, |
0f8d6231 | 5110 | HOST_WIDE_INT offset) |
910fdc79 DB |
5111 | { |
5112 | tree field; | |
18abb35e | 5113 | bool empty_p = true; |
31de5b77 RG |
5114 | |
5115 | if (TREE_CODE (type) != RECORD_TYPE) | |
18abb35e | 5116 | return false; |
3fe2f42a RG |
5117 | |
5118 | /* If the vector of fields is growing too big, bail out early. | |
5119 | Callers check for VEC_length <= MAX_FIELDS_FOR_FIELD_SENSITIVE, make | |
5120 | sure this fails. */ | |
31de5b77 | 5121 | if (VEC_length (fieldoff_s, *fieldstack) > MAX_FIELDS_FOR_FIELD_SENSITIVE) |
18abb35e | 5122 | return false; |
c58936b6 | 5123 | |
910ad8de | 5124 | for (field = TYPE_FIELDS (type); field; field = DECL_CHAIN (field)) |
31de5b77 RG |
5125 | if (TREE_CODE (field) == FIELD_DECL) |
5126 | { | |
5127 | bool push = false; | |
ee7d4b57 | 5128 | HOST_WIDE_INT foff = bitpos_of_field (field); |
31de5b77 | 5129 | |
ee7d4b57 RG |
5130 | if (!var_can_have_subvars (field) |
5131 | || TREE_CODE (TREE_TYPE (field)) == QUAL_UNION_TYPE | |
5132 | || TREE_CODE (TREE_TYPE (field)) == UNION_TYPE) | |
31de5b77 | 5133 | push = true; |
18abb35e | 5134 | else if (!push_fields_onto_fieldstack |
0f8d6231 | 5135 | (TREE_TYPE (field), fieldstack, offset + foff) |
31de5b77 RG |
5136 | && (DECL_SIZE (field) |
5137 | && !integer_zerop (DECL_SIZE (field)))) | |
5138 | /* Empty structures may have actual size, like in C++. So | |
5139 | see if we didn't push any subfields and the size is | |
5140 | nonzero, push the field onto the stack. */ | |
5141 | push = true; | |
5142 | ||
5143 | if (push) | |
910fdc79 | 5144 | { |
ee7d4b57 RG |
5145 | fieldoff_s *pair = NULL; |
5146 | bool has_unknown_size = false; | |
0f8d6231 | 5147 | bool must_have_pointers_p; |
ee7d4b57 RG |
5148 | |
5149 | if (!VEC_empty (fieldoff_s, *fieldstack)) | |
5150 | pair = VEC_last (fieldoff_s, *fieldstack); | |
5151 | ||
3fd3b156 RG |
5152 | /* If there isn't anything at offset zero, create sth. */ |
5153 | if (!pair | |
5154 | && offset + foff != 0) | |
5155 | { | |
5156 | pair = VEC_safe_push (fieldoff_s, heap, *fieldstack, NULL); | |
5157 | pair->offset = 0; | |
5158 | pair->size = offset + foff; | |
5159 | pair->has_unknown_size = false; | |
5160 | pair->must_have_pointers = false; | |
5161 | pair->may_have_pointers = false; | |
5162 | pair->only_restrict_pointers = false; | |
5163 | } | |
5164 | ||
ee7d4b57 RG |
5165 | if (!DECL_SIZE (field) |
5166 | || !host_integerp (DECL_SIZE (field), 1)) | |
5167 | has_unknown_size = true; | |
5168 | ||
5169 | /* If adjacent fields do not contain pointers merge them. */ | |
0f8d6231 | 5170 | must_have_pointers_p = field_must_have_pointers (field); |
ee7d4b57 | 5171 | if (pair |
ee7d4b57 | 5172 | && !has_unknown_size |
a81b065a | 5173 | && !must_have_pointers_p |
0f8d6231 RG |
5174 | && !pair->must_have_pointers |
5175 | && !pair->has_unknown_size | |
5176 | && pair->offset + (HOST_WIDE_INT)pair->size == offset + foff) | |
ee7d4b57 | 5177 | { |
ee7d4b57 RG |
5178 | pair->size += TREE_INT_CST_LOW (DECL_SIZE (field)); |
5179 | } | |
5180 | else | |
5181 | { | |
5182 | pair = VEC_safe_push (fieldoff_s, heap, *fieldstack, NULL); | |
5183 | pair->offset = offset + foff; | |
5184 | pair->has_unknown_size = has_unknown_size; | |
5185 | if (!has_unknown_size) | |
5186 | pair->size = TREE_INT_CST_LOW (DECL_SIZE (field)); | |
5187 | else | |
5188 | pair->size = -1; | |
0f8d6231 RG |
5189 | pair->must_have_pointers = must_have_pointers_p; |
5190 | pair->may_have_pointers = true; | |
74d27244 RG |
5191 | pair->only_restrict_pointers |
5192 | = (!has_unknown_size | |
5193 | && POINTER_TYPE_P (TREE_TYPE (field)) | |
5194 | && TYPE_RESTRICT (TREE_TYPE (field))); | |
ee7d4b57 | 5195 | } |
31de5b77 | 5196 | } |
18abb35e RG |
5197 | |
5198 | empty_p = false; | |
31de5b77 | 5199 | } |
910fdc79 | 5200 | |
18abb35e | 5201 | return !empty_p; |
910fdc79 DB |
5202 | } |
5203 | ||
5006671f RG |
5204 | /* Count the number of arguments DECL has, and set IS_VARARGS to true |
5205 | if it is a varargs function. */ | |
5206 | ||
5207 | static unsigned int | |
5208 | count_num_arguments (tree decl, bool *is_varargs) | |
5209 | { | |
de925a03 | 5210 | unsigned int num = 0; |
5006671f RG |
5211 | tree t; |
5212 | ||
de925a03 RG |
5213 | /* Capture named arguments for K&R functions. They do not |
5214 | have a prototype and thus no TYPE_ARG_TYPES. */ | |
910ad8de | 5215 | for (t = DECL_ARGUMENTS (decl); t; t = DECL_CHAIN (t)) |
de925a03 | 5216 | ++num; |
c58936b6 | 5217 | |
de925a03 RG |
5218 | /* Check if the function has variadic arguments. */ |
5219 | for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t)) | |
5220 | if (TREE_VALUE (t) == void_type_node) | |
5221 | break; | |
4ee00913 DB |
5222 | if (!t) |
5223 | *is_varargs = true; | |
de925a03 RG |
5224 | |
5225 | return num; | |
4ee00913 DB |
5226 | } |
5227 | ||
5228 | /* Creation function node for DECL, using NAME, and return the index | |
5229 | of the variable we've created for the function. */ | |
5230 | ||
27c2cfa6 | 5231 | static varinfo_t |
4ee00913 DB |
5232 | create_function_info_for (tree decl, const char *name) |
5233 | { | |
25a6a873 RG |
5234 | struct function *fn = DECL_STRUCT_FUNCTION (decl); |
5235 | varinfo_t vi, prev_vi; | |
c58936b6 | 5236 | tree arg; |
4ee00913 DB |
5237 | unsigned int i; |
5238 | bool is_varargs = false; | |
25a6a873 | 5239 | unsigned int num_args = count_num_arguments (decl, &is_varargs); |
4ee00913 DB |
5240 | |
5241 | /* Create the variable info. */ | |
5242 | ||
0bbf2ffa | 5243 | vi = new_var_info (decl, name); |
4ee00913 | 5244 | vi->offset = 0; |
4ee00913 | 5245 | vi->size = 1; |
25a6a873 RG |
5246 | vi->fullsize = fi_parm_base + num_args; |
5247 | vi->is_fn_info = 1; | |
5248 | vi->may_have_pointers = false; | |
5249 | if (is_varargs) | |
5250 | vi->fullsize = ~0; | |
3e5937d7 | 5251 | insert_vi_for_tree (vi->decl, vi); |
4ee00913 | 5252 | |
25a6a873 RG |
5253 | prev_vi = vi; |
5254 | ||
5255 | /* Create a variable for things the function clobbers and one for | |
5256 | things the function uses. */ | |
4ee00913 | 5257 | { |
25a6a873 RG |
5258 | varinfo_t clobbervi, usevi; |
5259 | const char *newname; | |
5260 | char *tempname; | |
5261 | ||
5262 | asprintf (&tempname, "%s.clobber", name); | |
5263 | newname = ggc_strdup (tempname); | |
5264 | free (tempname); | |
5265 | ||
5266 | clobbervi = new_var_info (NULL, newname); | |
5267 | clobbervi->offset = fi_clobbers; | |
5268 | clobbervi->size = 1; | |
5269 | clobbervi->fullsize = vi->fullsize; | |
5270 | clobbervi->is_full_var = true; | |
5271 | clobbervi->is_global_var = false; | |
5272 | gcc_assert (prev_vi->offset < clobbervi->offset); | |
5273 | prev_vi->next = clobbervi; | |
5274 | prev_vi = clobbervi; | |
25a6a873 RG |
5275 | |
5276 | asprintf (&tempname, "%s.use", name); | |
5277 | newname = ggc_strdup (tempname); | |
5278 | free (tempname); | |
5279 | ||
5280 | usevi = new_var_info (NULL, newname); | |
5281 | usevi->offset = fi_uses; | |
5282 | usevi->size = 1; | |
5283 | usevi->fullsize = vi->fullsize; | |
5284 | usevi->is_full_var = true; | |
5285 | usevi->is_global_var = false; | |
5286 | gcc_assert (prev_vi->offset < usevi->offset); | |
5287 | prev_vi->next = usevi; | |
5288 | prev_vi = usevi; | |
4ee00913 DB |
5289 | } |
5290 | ||
25a6a873 RG |
5291 | /* And one for the static chain. */ |
5292 | if (fn->static_chain_decl != NULL_TREE) | |
5293 | { | |
5294 | varinfo_t chainvi; | |
5295 | const char *newname; | |
5296 | char *tempname; | |
5297 | ||
5298 | asprintf (&tempname, "%s.chain", name); | |
5299 | newname = ggc_strdup (tempname); | |
5300 | free (tempname); | |
5301 | ||
5302 | chainvi = new_var_info (fn->static_chain_decl, newname); | |
5303 | chainvi->offset = fi_static_chain; | |
5304 | chainvi->size = 1; | |
5305 | chainvi->fullsize = vi->fullsize; | |
5306 | chainvi->is_full_var = true; | |
5307 | chainvi->is_global_var = false; | |
5308 | gcc_assert (prev_vi->offset < chainvi->offset); | |
5309 | prev_vi->next = chainvi; | |
5310 | prev_vi = chainvi; | |
25a6a873 RG |
5311 | insert_vi_for_tree (fn->static_chain_decl, chainvi); |
5312 | } | |
5313 | ||
5314 | /* Create a variable for the return var. */ | |
5315 | if (DECL_RESULT (decl) != NULL | |
5316 | || !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl)))) | |
5317 | { | |
5318 | varinfo_t resultvi; | |
5319 | const char *newname; | |
5320 | char *tempname; | |
5321 | tree resultdecl = decl; | |
5322 | ||
5323 | if (DECL_RESULT (decl)) | |
5324 | resultdecl = DECL_RESULT (decl); | |
5325 | ||
5326 | asprintf (&tempname, "%s.result", name); | |
5327 | newname = ggc_strdup (tempname); | |
5328 | free (tempname); | |
5329 | ||
5330 | resultvi = new_var_info (resultdecl, newname); | |
5331 | resultvi->offset = fi_result; | |
5332 | resultvi->size = 1; | |
5333 | resultvi->fullsize = vi->fullsize; | |
5334 | resultvi->is_full_var = true; | |
5335 | if (DECL_RESULT (decl)) | |
0f8d6231 | 5336 | resultvi->may_have_pointers = true; |
25a6a873 RG |
5337 | gcc_assert (prev_vi->offset < resultvi->offset); |
5338 | prev_vi->next = resultvi; | |
5339 | prev_vi = resultvi; | |
25a6a873 RG |
5340 | if (DECL_RESULT (decl)) |
5341 | insert_vi_for_tree (DECL_RESULT (decl), resultvi); | |
5342 | } | |
4ee00913 | 5343 | |
6416ae7f | 5344 | /* Set up variables for each argument. */ |
25a6a873 RG |
5345 | arg = DECL_ARGUMENTS (decl); |
5346 | for (i = 0; i < num_args; i++) | |
c58936b6 | 5347 | { |
4ee00913 DB |
5348 | varinfo_t argvi; |
5349 | const char *newname; | |
5350 | char *tempname; | |
4ee00913 DB |
5351 | tree argdecl = decl; |
5352 | ||
5353 | if (arg) | |
5354 | argdecl = arg; | |
c58936b6 | 5355 | |
25a6a873 | 5356 | asprintf (&tempname, "%s.arg%d", name, i); |
4ee00913 DB |
5357 | newname = ggc_strdup (tempname); |
5358 | free (tempname); | |
5359 | ||
0bbf2ffa | 5360 | argvi = new_var_info (argdecl, newname); |
25a6a873 | 5361 | argvi->offset = fi_parm_base + i; |
4ee00913 | 5362 | argvi->size = 1; |
e5bae89b | 5363 | argvi->is_full_var = true; |
4ee00913 | 5364 | argvi->fullsize = vi->fullsize; |
25a6a873 | 5365 | if (arg) |
0f8d6231 | 5366 | argvi->may_have_pointers = true; |
25a6a873 RG |
5367 | gcc_assert (prev_vi->offset < argvi->offset); |
5368 | prev_vi->next = argvi; | |
5369 | prev_vi = argvi; | |
4ee00913 DB |
5370 | if (arg) |
5371 | { | |
3e5937d7 | 5372 | insert_vi_for_tree (arg, argvi); |
910ad8de | 5373 | arg = DECL_CHAIN (arg); |
4ee00913 DB |
5374 | } |
5375 | } | |
4cf4d6a3 | 5376 | |
25a6a873 RG |
5377 | /* Add one representative for all further args. */ |
5378 | if (is_varargs) | |
4ee00913 | 5379 | { |
25a6a873 | 5380 | varinfo_t argvi; |
4ee00913 DB |
5381 | const char *newname; |
5382 | char *tempname; | |
25a6a873 | 5383 | tree decl; |
c58936b6 | 5384 | |
25a6a873 | 5385 | asprintf (&tempname, "%s.varargs", name); |
4ee00913 DB |
5386 | newname = ggc_strdup (tempname); |
5387 | free (tempname); | |
5388 | ||
25a6a873 | 5389 | /* We need sth that can be pointed to for va_start. */ |
7d6e2521 | 5390 | decl = build_fake_var_decl (ptr_type_node); |
25a6a873 RG |
5391 | |
5392 | argvi = new_var_info (decl, newname); | |
5393 | argvi->offset = fi_parm_base + num_args; | |
5394 | argvi->size = ~0; | |
5395 | argvi->is_full_var = true; | |
5396 | argvi->is_heap_var = true; | |
5397 | argvi->fullsize = vi->fullsize; | |
5398 | gcc_assert (prev_vi->offset < argvi->offset); | |
5399 | prev_vi->next = argvi; | |
5400 | prev_vi = argvi; | |
4ee00913 | 5401 | } |
0bbf2ffa | 5402 | |
27c2cfa6 | 5403 | return vi; |
c58936b6 | 5404 | } |
4ee00913 | 5405 | |
6c11790d | 5406 | |
c58936b6 | 5407 | /* Return true if FIELDSTACK contains fields that overlap. |
6c11790d DB |
5408 | FIELDSTACK is assumed to be sorted by offset. */ |
5409 | ||
5410 | static bool | |
5411 | check_for_overlaps (VEC (fieldoff_s,heap) *fieldstack) | |
5412 | { | |
5413 | fieldoff_s *fo = NULL; | |
5414 | unsigned int i; | |
30d2662c | 5415 | HOST_WIDE_INT lastoffset = -1; |
6c11790d | 5416 | |
ac47786e | 5417 | FOR_EACH_VEC_ELT (fieldoff_s, fieldstack, i, fo) |
6c11790d DB |
5418 | { |
5419 | if (fo->offset == lastoffset) | |
5420 | return true; | |
5421 | lastoffset = fo->offset; | |
5422 | } | |
5423 | return false; | |
5424 | } | |
21392f19 | 5425 | |
910fdc79 DB |
5426 | /* Create a varinfo structure for NAME and DECL, and add it to VARMAP. |
5427 | This will also create any varinfo structures necessary for fields | |
5428 | of DECL. */ | |
5429 | ||
18abb35e RG |
5430 | static varinfo_t |
5431 | create_variable_info_for_1 (tree decl, const char *name) | |
910fdc79 | 5432 | { |
18abb35e | 5433 | varinfo_t vi, newvi; |
82d6e6fc KG |
5434 | tree decl_type = TREE_TYPE (decl); |
5435 | tree declsize = DECL_P (decl) ? DECL_SIZE (decl) : TYPE_SIZE (decl_type); | |
910fdc79 | 5436 | VEC (fieldoff_s,heap) *fieldstack = NULL; |
18abb35e RG |
5437 | fieldoff_s *fo; |
5438 | unsigned int i; | |
c58936b6 | 5439 | |
4ee00913 | 5440 | if (!declsize |
ee7d4b57 | 5441 | || !host_integerp (declsize, 1)) |
910fdc79 | 5442 | { |
18abb35e RG |
5443 | vi = new_var_info (decl, name); |
5444 | vi->offset = 0; | |
910fdc79 | 5445 | vi->size = ~0; |
18abb35e RG |
5446 | vi->fullsize = ~0; |
5447 | vi->is_unknown_size_var = true; | |
5448 | vi->is_full_var = true; | |
0f8d6231 | 5449 | vi->may_have_pointers = true; |
18abb35e | 5450 | return vi; |
910fdc79 | 5451 | } |
18abb35e RG |
5452 | |
5453 | /* Collect field information. */ | |
5454 | if (use_field_sensitive | |
5455 | && var_can_have_subvars (decl) | |
5456 | /* ??? Force us to not use subfields for global initializers | |
5457 | in IPA mode. Else we'd have to parse arbitrary initializers. */ | |
5458 | && !(in_ipa_mode | |
5459 | && is_global_var (decl) | |
5460 | && DECL_INITIAL (decl))) | |
910fdc79 | 5461 | { |
18abb35e RG |
5462 | fieldoff_s *fo = NULL; |
5463 | bool notokay = false; | |
5464 | unsigned int i; | |
5465 | ||
0f8d6231 | 5466 | push_fields_onto_fieldstack (decl_type, &fieldstack, 0); |
18abb35e RG |
5467 | |
5468 | for (i = 0; !notokay && VEC_iterate (fieldoff_s, fieldstack, i, fo); i++) | |
5469 | if (fo->has_unknown_size | |
5470 | || fo->offset < 0) | |
5471 | { | |
5472 | notokay = true; | |
5473 | break; | |
5474 | } | |
5475 | ||
5476 | /* We can't sort them if we have a field with a variable sized type, | |
5477 | which will make notokay = true. In that case, we are going to return | |
5478 | without creating varinfos for the fields anyway, so sorting them is a | |
5479 | waste to boot. */ | |
5480 | if (!notokay) | |
5481 | { | |
5482 | sort_fieldstack (fieldstack); | |
5483 | /* Due to some C++ FE issues, like PR 22488, we might end up | |
5484 | what appear to be overlapping fields even though they, | |
5485 | in reality, do not overlap. Until the C++ FE is fixed, | |
5486 | we will simply disable field-sensitivity for these cases. */ | |
5487 | notokay = check_for_overlaps (fieldstack); | |
5488 | } | |
5489 | ||
5490 | if (notokay) | |
5491 | VEC_free (fieldoff_s, heap, fieldstack); | |
5492 | } | |
5493 | ||
5494 | /* If we didn't end up collecting sub-variables create a full | |
5495 | variable for the decl. */ | |
5496 | if (VEC_length (fieldoff_s, fieldstack) <= 1 | |
5497 | || VEC_length (fieldoff_s, fieldstack) > MAX_FIELDS_FOR_FIELD_SENSITIVE) | |
5498 | { | |
5499 | vi = new_var_info (decl, name); | |
5500 | vi->offset = 0; | |
0f8d6231 | 5501 | vi->may_have_pointers = true; |
4ee00913 | 5502 | vi->fullsize = TREE_INT_CST_LOW (declsize); |
910fdc79 | 5503 | vi->size = vi->fullsize; |
18abb35e RG |
5504 | vi->is_full_var = true; |
5505 | VEC_free (fieldoff_s, heap, fieldstack); | |
5506 | return vi; | |
910fdc79 | 5507 | } |
c58936b6 | 5508 | |
18abb35e RG |
5509 | vi = new_var_info (decl, name); |
5510 | vi->fullsize = TREE_INT_CST_LOW (declsize); | |
5511 | for (i = 0, newvi = vi; | |
5512 | VEC_iterate (fieldoff_s, fieldstack, i, fo); | |
5513 | ++i, newvi = newvi->next) | |
5514 | { | |
5515 | const char *newname = "NULL"; | |
5516 | char *tempname; | |
5517 | ||
5518 | if (dump_file) | |
5519 | { | |
5520 | asprintf (&tempname, "%s." HOST_WIDE_INT_PRINT_DEC | |
5521 | "+" HOST_WIDE_INT_PRINT_DEC, name, fo->offset, fo->size); | |
5522 | newname = ggc_strdup (tempname); | |
5523 | free (tempname); | |
5524 | } | |
5525 | newvi->name = newname; | |
5526 | newvi->offset = fo->offset; | |
5527 | newvi->size = fo->size; | |
5528 | newvi->fullsize = vi->fullsize; | |
5529 | newvi->may_have_pointers = fo->may_have_pointers; | |
5530 | newvi->only_restrict_pointers = fo->only_restrict_pointers; | |
5531 | if (i + 1 < VEC_length (fieldoff_s, fieldstack)) | |
5532 | newvi->next = new_var_info (decl, name); | |
5533 | } | |
5534 | ||
5535 | VEC_free (fieldoff_s, heap, fieldstack); | |
25a6a873 | 5536 | |
18abb35e RG |
5537 | return vi; |
5538 | } | |
5539 | ||
5540 | static unsigned int | |
5541 | create_variable_info_for (tree decl, const char *name) | |
5542 | { | |
5543 | varinfo_t vi = create_variable_info_for_1 (decl, name); | |
5544 | unsigned int id = vi->id; | |
5545 | ||
5546 | insert_vi_for_tree (decl, vi); | |
5547 | ||
1565af08 RG |
5548 | if (TREE_CODE (decl) != VAR_DECL) |
5549 | return id; | |
5550 | ||
18abb35e RG |
5551 | /* Create initial constraints for globals. */ |
5552 | for (; vi; vi = vi->next) | |
13c6bff4 | 5553 | { |
18abb35e RG |
5554 | if (!vi->may_have_pointers |
5555 | || !vi->is_global_var) | |
5556 | continue; | |
5557 | ||
25a6a873 | 5558 | /* Mark global restrict qualified pointers. */ |
18abb35e RG |
5559 | if ((POINTER_TYPE_P (TREE_TYPE (decl)) |
5560 | && TYPE_RESTRICT (TREE_TYPE (decl))) | |
5561 | || vi->only_restrict_pointers) | |
d3553615 RG |
5562 | { |
5563 | make_constraint_from_global_restrict (vi, "GLOBAL_RESTRICT"); | |
5564 | continue; | |
5565 | } | |
25a6a873 | 5566 | |
1565af08 | 5567 | /* In non-IPA mode the initializer from nonlocal is all we need. */ |
25a6a873 | 5568 | if (!in_ipa_mode |
1565af08 | 5569 | || DECL_HARD_REGISTER (decl)) |
25a6a873 RG |
5570 | make_copy_constraint (vi, nonlocal_id); |
5571 | ||
d3553615 RG |
5572 | /* In IPA mode parse the initializer and generate proper constraints |
5573 | for it. */ | |
1565af08 | 5574 | else |
25a6a873 | 5575 | { |
1565af08 RG |
5576 | struct varpool_node *vnode = varpool_get_node (decl); |
5577 | ||
5578 | /* For escaped variables initialize them from nonlocal. */ | |
5579 | if (!varpool_all_refs_explicit_p (vnode)) | |
5580 | make_copy_constraint (vi, nonlocal_id); | |
5581 | ||
5582 | /* If this is a global variable with an initializer and we are in | |
5583 | IPA mode generate constraints for it. */ | |
aa19cf87 JH |
5584 | if (DECL_INITIAL (decl) |
5585 | && vnode->analyzed) | |
25a6a873 | 5586 | { |
1565af08 RG |
5587 | VEC (ce_s, heap) *rhsc = NULL; |
5588 | struct constraint_expr lhs, *rhsp; | |
5589 | unsigned i; | |
5590 | get_constraint_for_rhs (DECL_INITIAL (decl), &rhsc); | |
5591 | lhs.var = vi->id; | |
25a6a873 RG |
5592 | lhs.offset = 0; |
5593 | lhs.type = SCALAR; | |
ac47786e | 5594 | FOR_EACH_VEC_ELT (ce_s, rhsc, i, rhsp) |
25a6a873 | 5595 | process_constraint (new_constraint (lhs, *rhsp)); |
1565af08 RG |
5596 | /* If this is a variable that escapes from the unit |
5597 | the initializer escapes as well. */ | |
5598 | if (!varpool_all_refs_explicit_p (vnode)) | |
5599 | { | |
5600 | lhs.var = escaped_id; | |
5601 | lhs.offset = 0; | |
5602 | lhs.type = SCALAR; | |
5603 | FOR_EACH_VEC_ELT (ce_s, rhsc, i, rhsp) | |
5604 | process_constraint (new_constraint (lhs, *rhsp)); | |
5605 | } | |
5606 | VEC_free (ce_s, heap, rhsc); | |
25a6a873 | 5607 | } |
25a6a873 | 5608 | } |
13c6bff4 | 5609 | } |
910fdc79 | 5610 | |
18abb35e | 5611 | return id; |
910fdc79 DB |
5612 | } |
5613 | ||
5614 | /* Print out the points-to solution for VAR to FILE. */ | |
5615 | ||
5006671f | 5616 | static void |
910fdc79 DB |
5617 | dump_solution_for_var (FILE *file, unsigned int var) |
5618 | { | |
5619 | varinfo_t vi = get_varinfo (var); | |
5620 | unsigned int i; | |
c58936b6 DB |
5621 | bitmap_iterator bi; |
5622 | ||
25a6a873 RG |
5623 | /* Dump the solution for unified vars anyway, this avoids difficulties |
5624 | in scanning dumps in the testsuite. */ | |
5625 | fprintf (file, "%s = { ", vi->name); | |
5626 | vi = get_varinfo (find (var)); | |
5627 | EXECUTE_IF_SET_IN_BITMAP (vi->solution, 0, i, bi) | |
5628 | fprintf (file, "%s ", get_varinfo (i)->name); | |
5629 | fprintf (file, "}"); | |
5630 | ||
5631 | /* But note when the variable was unified. */ | |
5632 | if (vi->id != var) | |
5633 | fprintf (file, " same as %s", vi->name); | |
5634 | ||
5635 | fprintf (file, "\n"); | |
910fdc79 DB |
5636 | } |
5637 | ||
5638 | /* Print the points-to solution for VAR to stdout. */ | |
5639 | ||
24e47c76 | 5640 | DEBUG_FUNCTION void |
910fdc79 DB |
5641 | debug_solution_for_var (unsigned int var) |
5642 | { | |
5643 | dump_solution_for_var (stdout, var); | |
5644 | } | |
5645 | ||
910fdc79 DB |
5646 | /* Create varinfo structures for all of the variables in the |
5647 | function for intraprocedural mode. */ | |
5648 | ||
5649 | static void | |
5650 | intra_create_variable_infos (void) | |
5651 | { | |
5652 | tree t; | |
b23987ec | 5653 | |
6e7e772d | 5654 | /* For each incoming pointer argument arg, create the constraint ARG |
0d3c82d6 RG |
5655 | = NONLOCAL or a dummy variable if it is a restrict qualified |
5656 | passed-by-reference argument. */ | |
910ad8de | 5657 | for (t = DECL_ARGUMENTS (current_function_decl); t; t = DECL_CHAIN (t)) |
910fdc79 | 5658 | { |
d3553615 | 5659 | varinfo_t p = get_vi_for_tree (t); |
c58936b6 | 5660 | |
bacd3fb6 | 5661 | /* For restrict qualified pointers to objects passed by |
960dcaf5 JJ |
5662 | reference build a real representative for the pointed-to object. |
5663 | Treat restrict qualified references the same. */ | |
5664 | if (TYPE_RESTRICT (TREE_TYPE (t)) | |
5665 | && ((DECL_BY_REFERENCE (t) && POINTER_TYPE_P (TREE_TYPE (t))) | |
b31799f4 EB |
5666 | || TREE_CODE (TREE_TYPE (t)) == REFERENCE_TYPE) |
5667 | && !type_contains_placeholder_p (TREE_TYPE (TREE_TYPE (t)))) | |
bacd3fb6 RG |
5668 | { |
5669 | struct constraint_expr lhsc, rhsc; | |
5670 | varinfo_t vi; | |
7d6e2521 RG |
5671 | tree heapvar = build_fake_var_decl (TREE_TYPE (TREE_TYPE (t))); |
5672 | DECL_EXTERNAL (heapvar) = 1; | |
1565af08 RG |
5673 | vi = create_variable_info_for_1 (heapvar, "PARM_NOALIAS"); |
5674 | insert_vi_for_tree (heapvar, vi); | |
d3553615 | 5675 | lhsc.var = p->id; |
bacd3fb6 RG |
5676 | lhsc.type = SCALAR; |
5677 | lhsc.offset = 0; | |
7d6e2521 | 5678 | rhsc.var = vi->id; |
bacd3fb6 RG |
5679 | rhsc.type = ADDRESSOF; |
5680 | rhsc.offset = 0; | |
5681 | process_constraint (new_constraint (lhsc, rhsc)); | |
1565af08 RG |
5682 | for (; vi; vi = vi->next) |
5683 | if (vi->may_have_pointers) | |
5684 | { | |
5685 | if (vi->only_restrict_pointers) | |
d3553615 RG |
5686 | make_constraint_from_global_restrict (vi, "GLOBAL_RESTRICT"); |
5687 | else | |
5688 | make_copy_constraint (vi, nonlocal_id); | |
1565af08 | 5689 | } |
bacd3fb6 RG |
5690 | continue; |
5691 | } | |
5692 | ||
74d27244 RG |
5693 | if (POINTER_TYPE_P (TREE_TYPE (t)) |
5694 | && TYPE_RESTRICT (TREE_TYPE (t))) | |
d3553615 RG |
5695 | make_constraint_from_global_restrict (p, "PARM_RESTRICT"); |
5696 | else | |
5697 | { | |
5698 | for (; p; p = p->next) | |
5699 | { | |
5700 | if (p->only_restrict_pointers) | |
5701 | make_constraint_from_global_restrict (p, "PARM_RESTRICT"); | |
5702 | else if (p->may_have_pointers) | |
5703 | make_constraint_from (p, nonlocal_id); | |
5704 | } | |
5705 | } | |
21392f19 | 5706 | } |
75af9746 | 5707 | |
10bd6c5c RG |
5708 | /* Add a constraint for a result decl that is passed by reference. */ |
5709 | if (DECL_RESULT (cfun->decl) | |
5710 | && DECL_BY_REFERENCE (DECL_RESULT (cfun->decl))) | |
5711 | { | |
5712 | varinfo_t p, result_vi = get_vi_for_tree (DECL_RESULT (cfun->decl)); | |
5713 | ||
5714 | for (p = result_vi; p; p = p->next) | |
5006671f | 5715 | make_constraint_from (p, nonlocal_id); |
10bd6c5c RG |
5716 | } |
5717 | ||
75af9746 RG |
5718 | /* Add a constraint for the incoming static chain parameter. */ |
5719 | if (cfun->static_chain_decl != NULL_TREE) | |
5720 | { | |
5721 | varinfo_t p, chain_vi = get_vi_for_tree (cfun->static_chain_decl); | |
5722 | ||
5723 | for (p = chain_vi; p; p = p->next) | |
5724 | make_constraint_from (p, nonlocal_id); | |
5725 | } | |
910fdc79 DB |
5726 | } |
5727 | ||
1296c31f DB |
5728 | /* Structure used to put solution bitmaps in a hashtable so they can |
5729 | be shared among variables with the same points-to set. */ | |
5730 | ||
5731 | typedef struct shared_bitmap_info | |
5732 | { | |
5733 | bitmap pt_vars; | |
5734 | hashval_t hashcode; | |
5735 | } *shared_bitmap_info_t; | |
e5cfc29f | 5736 | typedef const struct shared_bitmap_info *const_shared_bitmap_info_t; |
1296c31f DB |
5737 | |
5738 | static htab_t shared_bitmap_table; | |
5739 | ||
5740 | /* Hash function for a shared_bitmap_info_t */ | |
5741 | ||
5742 | static hashval_t | |
5743 | shared_bitmap_hash (const void *p) | |
5744 | { | |
e5cfc29f | 5745 | const_shared_bitmap_info_t const bi = (const_shared_bitmap_info_t) p; |
1296c31f DB |
5746 | return bi->hashcode; |
5747 | } | |
5748 | ||
5749 | /* Equality function for two shared_bitmap_info_t's. */ | |
5750 | ||
5751 | static int | |
5752 | shared_bitmap_eq (const void *p1, const void *p2) | |
5753 | { | |
e5cfc29f KG |
5754 | const_shared_bitmap_info_t const sbi1 = (const_shared_bitmap_info_t) p1; |
5755 | const_shared_bitmap_info_t const sbi2 = (const_shared_bitmap_info_t) p2; | |
1296c31f DB |
5756 | return bitmap_equal_p (sbi1->pt_vars, sbi2->pt_vars); |
5757 | } | |
5758 | ||
5759 | /* Lookup a bitmap in the shared bitmap hashtable, and return an already | |
5760 | existing instance if there is one, NULL otherwise. */ | |
5761 | ||
5762 | static bitmap | |
5763 | shared_bitmap_lookup (bitmap pt_vars) | |
5764 | { | |
5765 | void **slot; | |
5766 | struct shared_bitmap_info sbi; | |
5767 | ||
5768 | sbi.pt_vars = pt_vars; | |
5769 | sbi.hashcode = bitmap_hash (pt_vars); | |
7b765bed | 5770 | |
1296c31f DB |
5771 | slot = htab_find_slot_with_hash (shared_bitmap_table, &sbi, |
5772 | sbi.hashcode, NO_INSERT); | |
5773 | if (!slot) | |
5774 | return NULL; | |
5775 | else | |
5776 | return ((shared_bitmap_info_t) *slot)->pt_vars; | |
5777 | } | |
5778 | ||
5779 | ||
5780 | /* Add a bitmap to the shared bitmap hashtable. */ | |
5781 | ||
5782 | static void | |
5783 | shared_bitmap_add (bitmap pt_vars) | |
5784 | { | |
5785 | void **slot; | |
5786 | shared_bitmap_info_t sbi = XNEW (struct shared_bitmap_info); | |
7b765bed | 5787 | |
1296c31f DB |
5788 | sbi->pt_vars = pt_vars; |
5789 | sbi->hashcode = bitmap_hash (pt_vars); | |
7b765bed | 5790 | |
1296c31f DB |
5791 | slot = htab_find_slot_with_hash (shared_bitmap_table, sbi, |
5792 | sbi->hashcode, INSERT); | |
5793 | gcc_assert (!*slot); | |
5794 | *slot = (void *) sbi; | |
5795 | } | |
5796 | ||
5797 | ||
4d7a65ea | 5798 | /* Set bits in INTO corresponding to the variable uids in solution set FROM. */ |
910fdc79 | 5799 | |
b8698a0f | 5800 | static void |
4d7a65ea | 5801 | set_uids_in_ptset (bitmap into, bitmap from, struct pt_solution *pt) |
910fdc79 DB |
5802 | { |
5803 | unsigned int i; | |
5804 | bitmap_iterator bi; | |
f83ca251 | 5805 | |
910fdc79 DB |
5806 | EXECUTE_IF_SET_IN_BITMAP (from, 0, i, bi) |
5807 | { | |
5808 | varinfo_t vi = get_varinfo (i); | |
c58936b6 | 5809 | |
e8ca4159 DN |
5810 | /* The only artificial variables that are allowed in a may-alias |
5811 | set are heap variables. */ | |
5812 | if (vi->is_artificial_var && !vi->is_heap_var) | |
5813 | continue; | |
c58936b6 | 5814 | |
5611cf0b RG |
5815 | if (TREE_CODE (vi->decl) == VAR_DECL |
5816 | || TREE_CODE (vi->decl) == PARM_DECL | |
5817 | || TREE_CODE (vi->decl) == RESULT_DECL) | |
58b82d2b | 5818 | { |
25a6a873 RG |
5819 | /* If we are in IPA mode we will not recompute points-to |
5820 | sets after inlining so make sure they stay valid. */ | |
5821 | if (in_ipa_mode | |
5822 | && !DECL_PT_UID_SET_P (vi->decl)) | |
5823 | SET_DECL_PT_UID (vi->decl, DECL_UID (vi->decl)); | |
5824 | ||
5006671f RG |
5825 | /* Add the decl to the points-to set. Note that the points-to |
5826 | set contains global variables. */ | |
25a6a873 | 5827 | bitmap_set_bit (into, DECL_PT_UID (vi->decl)); |
74d27244 | 5828 | if (vi->is_global_var) |
5006671f | 5829 | pt->vars_contains_global = true; |
e8ca4159 | 5830 | } |
910fdc79 DB |
5831 | } |
5832 | } | |
e8ca4159 DN |
5833 | |
5834 | ||
4d7a65ea | 5835 | /* Compute the points-to solution *PT for the variable VI. */ |
ce1b6498 RG |
5836 | |
5837 | static void | |
1cfd38be | 5838 | find_what_var_points_to (varinfo_t orig_vi, struct pt_solution *pt) |
ce1b6498 | 5839 | { |
4d7a65ea | 5840 | unsigned int i; |
5006671f RG |
5841 | bitmap_iterator bi; |
5842 | bitmap finished_solution; | |
5843 | bitmap result; | |
1cfd38be | 5844 | varinfo_t vi; |
5006671f RG |
5845 | |
5846 | memset (pt, 0, sizeof (struct pt_solution)); | |
5847 | ||
5848 | /* This variable may have been collapsed, let's get the real | |
5849 | variable. */ | |
1cfd38be | 5850 | vi = get_varinfo (find (orig_vi->id)); |
5006671f RG |
5851 | |
5852 | /* Translate artificial variables into SSA_NAME_PTR_INFO | |
5853 | attributes. */ | |
5854 | EXECUTE_IF_SET_IN_BITMAP (vi->solution, 0, i, bi) | |
5855 | { | |
5856 | varinfo_t vi = get_varinfo (i); | |
5857 | ||
5858 | if (vi->is_artificial_var) | |
5859 | { | |
5860 | if (vi->id == nothing_id) | |
5861 | pt->null = 1; | |
5862 | else if (vi->id == escaped_id) | |
25a6a873 RG |
5863 | { |
5864 | if (in_ipa_mode) | |
5865 | pt->ipa_escaped = 1; | |
5866 | else | |
5867 | pt->escaped = 1; | |
5868 | } | |
5006671f RG |
5869 | else if (vi->id == nonlocal_id) |
5870 | pt->nonlocal = 1; | |
5871 | else if (vi->is_heap_var) | |
5872 | /* We represent heapvars in the points-to set properly. */ | |
5873 | ; | |
91deb937 RG |
5874 | else if (vi->id == readonly_id) |
5875 | /* Nobody cares. */ | |
5876 | ; | |
5006671f | 5877 | else if (vi->id == anything_id |
5006671f RG |
5878 | || vi->id == integer_id) |
5879 | pt->anything = 1; | |
5880 | } | |
5881 | } | |
5882 | ||
5883 | /* Instead of doing extra work, simply do not create | |
5884 | elaborate points-to information for pt_anything pointers. */ | |
d3553615 | 5885 | if (pt->anything) |
4d7a65ea | 5886 | return; |
5006671f RG |
5887 | |
5888 | /* Share the final set of variables when possible. */ | |
5889 | finished_solution = BITMAP_GGC_ALLOC (); | |
5890 | stats.points_to_sets_created++; | |
5891 | ||
4d7a65ea | 5892 | set_uids_in_ptset (finished_solution, vi->solution, pt); |
5006671f RG |
5893 | result = shared_bitmap_lookup (finished_solution); |
5894 | if (!result) | |
5895 | { | |
5896 | shared_bitmap_add (finished_solution); | |
5897 | pt->vars = finished_solution; | |
5898 | } | |
5899 | else | |
5900 | { | |
5901 | pt->vars = result; | |
5902 | bitmap_clear (finished_solution); | |
5903 | } | |
5006671f RG |
5904 | } |
5905 | ||
4d7a65ea | 5906 | /* Given a pointer variable P, fill in its points-to set. */ |
5006671f RG |
5907 | |
5908 | static void | |
4d7a65ea | 5909 | find_what_p_points_to (tree p) |
5006671f RG |
5910 | { |
5911 | struct ptr_info_def *pi; | |
7cc92f92 | 5912 | tree lookup_p = p; |
3e5937d7 | 5913 | varinfo_t vi; |
e8ca4159 | 5914 | |
7cc92f92 RG |
5915 | /* For parameters, get at the points-to set for the actual parm |
5916 | decl. */ | |
c58936b6 | 5917 | if (TREE_CODE (p) == SSA_NAME |
6938f93f JH |
5918 | && (TREE_CODE (SSA_NAME_VAR (p)) == PARM_DECL |
5919 | || TREE_CODE (SSA_NAME_VAR (p)) == RESULT_DECL) | |
38635499 | 5920 | && SSA_NAME_IS_DEFAULT_DEF (p)) |
7cc92f92 RG |
5921 | lookup_p = SSA_NAME_VAR (p); |
5922 | ||
15814ba0 | 5923 | vi = lookup_vi_for_tree (lookup_p); |
5006671f RG |
5924 | if (!vi) |
5925 | return; | |
5926 | ||
5927 | pi = get_ptr_info (p); | |
4d7a65ea | 5928 | find_what_var_points_to (vi, &pi->pt); |
5006671f | 5929 | } |
7b765bed | 5930 | |
910fdc79 | 5931 | |
5006671f | 5932 | /* Query statistics for points-to solutions. */ |
c58936b6 | 5933 | |
5006671f RG |
5934 | static struct { |
5935 | unsigned HOST_WIDE_INT pt_solution_includes_may_alias; | |
5936 | unsigned HOST_WIDE_INT pt_solution_includes_no_alias; | |
5937 | unsigned HOST_WIDE_INT pt_solutions_intersect_may_alias; | |
5938 | unsigned HOST_WIDE_INT pt_solutions_intersect_no_alias; | |
5939 | } pta_stats; | |
e8ca4159 | 5940 | |
5006671f RG |
5941 | void |
5942 | dump_pta_stats (FILE *s) | |
5943 | { | |
5944 | fprintf (s, "\nPTA query stats:\n"); | |
5945 | fprintf (s, " pt_solution_includes: " | |
5946 | HOST_WIDE_INT_PRINT_DEC" disambiguations, " | |
5947 | HOST_WIDE_INT_PRINT_DEC" queries\n", | |
5948 | pta_stats.pt_solution_includes_no_alias, | |
5949 | pta_stats.pt_solution_includes_no_alias | |
5950 | + pta_stats.pt_solution_includes_may_alias); | |
5951 | fprintf (s, " pt_solutions_intersect: " | |
5952 | HOST_WIDE_INT_PRINT_DEC" disambiguations, " | |
5953 | HOST_WIDE_INT_PRINT_DEC" queries\n", | |
5954 | pta_stats.pt_solutions_intersect_no_alias, | |
5955 | pta_stats.pt_solutions_intersect_no_alias | |
5956 | + pta_stats.pt_solutions_intersect_may_alias); | |
5957 | } | |
e8ca4159 | 5958 | |
9f09b13f | 5959 | |
5006671f RG |
5960 | /* Reset the points-to solution *PT to a conservative default |
5961 | (point to anything). */ | |
7b765bed | 5962 | |
5006671f RG |
5963 | void |
5964 | pt_solution_reset (struct pt_solution *pt) | |
5965 | { | |
5966 | memset (pt, 0, sizeof (struct pt_solution)); | |
5967 | pt->anything = true; | |
5968 | } | |
1296c31f | 5969 | |
55b34b5f | 5970 | /* Set the points-to solution *PT to point only to the variables |
25a6a873 RG |
5971 | in VARS. VARS_CONTAINS_GLOBAL specifies whether that contains |
5972 | global variables and VARS_CONTAINS_RESTRICT specifies whether | |
5973 | it contains restrict tag variables. */ | |
55b34b5f RG |
5974 | |
5975 | void | |
d3553615 | 5976 | pt_solution_set (struct pt_solution *pt, bitmap vars, bool vars_contains_global) |
55b34b5f | 5977 | { |
55b34b5f RG |
5978 | memset (pt, 0, sizeof (struct pt_solution)); |
5979 | pt->vars = vars; | |
25a6a873 | 5980 | pt->vars_contains_global = vars_contains_global; |
25a6a873 RG |
5981 | } |
5982 | ||
90fa9e17 RG |
5983 | /* Set the points-to solution *PT to point only to the variable VAR. */ |
5984 | ||
5985 | void | |
5986 | pt_solution_set_var (struct pt_solution *pt, tree var) | |
5987 | { | |
5988 | memset (pt, 0, sizeof (struct pt_solution)); | |
5989 | pt->vars = BITMAP_GGC_ALLOC (); | |
1b2bb171 | 5990 | bitmap_set_bit (pt->vars, DECL_PT_UID (var)); |
90fa9e17 RG |
5991 | pt->vars_contains_global = is_global_var (var); |
5992 | } | |
5993 | ||
25a6a873 RG |
5994 | /* Computes the union of the points-to solutions *DEST and *SRC and |
5995 | stores the result in *DEST. This changes the points-to bitmap | |
5996 | of *DEST and thus may not be used if that might be shared. | |
5997 | The points-to bitmap of *SRC and *DEST will not be shared after | |
5998 | this function if they were not before. */ | |
5999 | ||
6000 | static void | |
6001 | pt_solution_ior_into (struct pt_solution *dest, struct pt_solution *src) | |
6002 | { | |
6003 | dest->anything |= src->anything; | |
6004 | if (dest->anything) | |
55b34b5f | 6005 | { |
25a6a873 RG |
6006 | pt_solution_reset (dest); |
6007 | return; | |
55b34b5f | 6008 | } |
25a6a873 RG |
6009 | |
6010 | dest->nonlocal |= src->nonlocal; | |
6011 | dest->escaped |= src->escaped; | |
6012 | dest->ipa_escaped |= src->ipa_escaped; | |
6013 | dest->null |= src->null; | |
6014 | dest->vars_contains_global |= src->vars_contains_global; | |
25a6a873 RG |
6015 | if (!src->vars) |
6016 | return; | |
6017 | ||
6018 | if (!dest->vars) | |
6019 | dest->vars = BITMAP_GGC_ALLOC (); | |
6020 | bitmap_ior_into (dest->vars, src->vars); | |
55b34b5f RG |
6021 | } |
6022 | ||
5006671f | 6023 | /* Return true if the points-to solution *PT is empty. */ |
e8ca4159 | 6024 | |
25a6a873 | 6025 | bool |
5006671f RG |
6026 | pt_solution_empty_p (struct pt_solution *pt) |
6027 | { | |
6028 | if (pt->anything | |
6029 | || pt->nonlocal) | |
6030 | return false; | |
e8ca4159 | 6031 | |
5006671f RG |
6032 | if (pt->vars |
6033 | && !bitmap_empty_p (pt->vars)) | |
6034 | return false; | |
e8ca4159 | 6035 | |
5006671f RG |
6036 | /* If the solution includes ESCAPED, check if that is empty. */ |
6037 | if (pt->escaped | |
6038 | && !pt_solution_empty_p (&cfun->gimple_df->escaped)) | |
6039 | return false; | |
6040 | ||
25a6a873 RG |
6041 | /* If the solution includes ESCAPED, check if that is empty. */ |
6042 | if (pt->ipa_escaped | |
6043 | && !pt_solution_empty_p (&ipa_escaped_pt)) | |
6044 | return false; | |
6045 | ||
5006671f | 6046 | return true; |
910fdc79 DB |
6047 | } |
6048 | ||
703ffc30 TV |
6049 | /* Return true if the points-to solution *PT only point to a single var, and |
6050 | return the var uid in *UID. */ | |
6051 | ||
6052 | bool | |
6053 | pt_solution_singleton_p (struct pt_solution *pt, unsigned *uid) | |
6054 | { | |
6055 | if (pt->anything || pt->nonlocal || pt->escaped || pt->ipa_escaped | |
6056 | || pt->null || pt->vars == NULL | |
6057 | || !bitmap_single_bit_set_p (pt->vars)) | |
6058 | return false; | |
6059 | ||
6060 | *uid = bitmap_first_set_bit (pt->vars); | |
6061 | return true; | |
6062 | } | |
6063 | ||
5006671f | 6064 | /* Return true if the points-to solution *PT includes global memory. */ |
63a4ef6f | 6065 | |
2f571334 | 6066 | bool |
5006671f | 6067 | pt_solution_includes_global (struct pt_solution *pt) |
2f571334 | 6068 | { |
5006671f RG |
6069 | if (pt->anything |
6070 | || pt->nonlocal | |
6071 | || pt->vars_contains_global) | |
6072 | return true; | |
2f571334 | 6073 | |
5006671f RG |
6074 | if (pt->escaped) |
6075 | return pt_solution_includes_global (&cfun->gimple_df->escaped); | |
2f571334 | 6076 | |
25a6a873 RG |
6077 | if (pt->ipa_escaped) |
6078 | return pt_solution_includes_global (&ipa_escaped_pt); | |
6079 | ||
6080 | /* ??? This predicate is not correct for the IPA-PTA solution | |
6081 | as we do not properly distinguish between unit escape points | |
6082 | and global variables. */ | |
6083 | if (cfun->gimple_df->ipa_pta) | |
6084 | return true; | |
6085 | ||
5006671f RG |
6086 | return false; |
6087 | } | |
2f571334 | 6088 | |
5006671f RG |
6089 | /* Return true if the points-to solution *PT includes the variable |
6090 | declaration DECL. */ | |
15c15196 | 6091 | |
5006671f RG |
6092 | static bool |
6093 | pt_solution_includes_1 (struct pt_solution *pt, const_tree decl) | |
6094 | { | |
6095 | if (pt->anything) | |
6096 | return true; | |
2f571334 | 6097 | |
5006671f RG |
6098 | if (pt->nonlocal |
6099 | && is_global_var (decl)) | |
6100 | return true; | |
2f571334 | 6101 | |
5006671f | 6102 | if (pt->vars |
25a6a873 | 6103 | && bitmap_bit_p (pt->vars, DECL_PT_UID (decl))) |
5006671f | 6104 | return true; |
2f571334 | 6105 | |
5006671f RG |
6106 | /* If the solution includes ESCAPED, check it. */ |
6107 | if (pt->escaped | |
6108 | && pt_solution_includes_1 (&cfun->gimple_df->escaped, decl)) | |
6109 | return true; | |
2f571334 | 6110 | |
25a6a873 RG |
6111 | /* If the solution includes ESCAPED, check it. */ |
6112 | if (pt->ipa_escaped | |
6113 | && pt_solution_includes_1 (&ipa_escaped_pt, decl)) | |
6114 | return true; | |
6115 | ||
5006671f | 6116 | return false; |
2f571334 | 6117 | } |
910fdc79 | 6118 | |
5006671f RG |
6119 | bool |
6120 | pt_solution_includes (struct pt_solution *pt, const_tree decl) | |
15c15196 | 6121 | { |
5006671f RG |
6122 | bool res = pt_solution_includes_1 (pt, decl); |
6123 | if (res) | |
6124 | ++pta_stats.pt_solution_includes_may_alias; | |
6125 | else | |
6126 | ++pta_stats.pt_solution_includes_no_alias; | |
6127 | return res; | |
6128 | } | |
15c15196 | 6129 | |
5006671f RG |
6130 | /* Return true if both points-to solutions PT1 and PT2 have a non-empty |
6131 | intersection. */ | |
15c15196 | 6132 | |
5006671f RG |
6133 | static bool |
6134 | pt_solutions_intersect_1 (struct pt_solution *pt1, struct pt_solution *pt2) | |
6135 | { | |
6136 | if (pt1->anything || pt2->anything) | |
6137 | return true; | |
15c15196 | 6138 | |
5006671f RG |
6139 | /* If either points to unknown global memory and the other points to |
6140 | any global memory they alias. */ | |
6141 | if ((pt1->nonlocal | |
6142 | && (pt2->nonlocal | |
6143 | || pt2->vars_contains_global)) | |
6144 | || (pt2->nonlocal | |
6145 | && pt1->vars_contains_global)) | |
6146 | return true; | |
15c15196 | 6147 | |
5006671f RG |
6148 | /* Check the escaped solution if required. */ |
6149 | if ((pt1->escaped || pt2->escaped) | |
6150 | && !pt_solution_empty_p (&cfun->gimple_df->escaped)) | |
6151 | { | |
6152 | /* If both point to escaped memory and that solution | |
6153 | is not empty they alias. */ | |
6154 | if (pt1->escaped && pt2->escaped) | |
6155 | return true; | |
15c15196 | 6156 | |
5006671f RG |
6157 | /* If either points to escaped memory see if the escaped solution |
6158 | intersects with the other. */ | |
6159 | if ((pt1->escaped | |
6160 | && pt_solutions_intersect_1 (&cfun->gimple_df->escaped, pt2)) | |
6161 | || (pt2->escaped | |
6162 | && pt_solutions_intersect_1 (&cfun->gimple_df->escaped, pt1))) | |
6163 | return true; | |
15c15196 RG |
6164 | } |
6165 | ||
25a6a873 RG |
6166 | /* Check the escaped solution if required. |
6167 | ??? Do we need to check the local against the IPA escaped sets? */ | |
6168 | if ((pt1->ipa_escaped || pt2->ipa_escaped) | |
6169 | && !pt_solution_empty_p (&ipa_escaped_pt)) | |
6170 | { | |
6171 | /* If both point to escaped memory and that solution | |
6172 | is not empty they alias. */ | |
6173 | if (pt1->ipa_escaped && pt2->ipa_escaped) | |
6174 | return true; | |
6175 | ||
6176 | /* If either points to escaped memory see if the escaped solution | |
6177 | intersects with the other. */ | |
6178 | if ((pt1->ipa_escaped | |
6179 | && pt_solutions_intersect_1 (&ipa_escaped_pt, pt2)) | |
6180 | || (pt2->ipa_escaped | |
6181 | && pt_solutions_intersect_1 (&ipa_escaped_pt, pt1))) | |
6182 | return true; | |
6183 | } | |
6184 | ||
5006671f RG |
6185 | /* Now both pointers alias if their points-to solution intersects. */ |
6186 | return (pt1->vars | |
6187 | && pt2->vars | |
6188 | && bitmap_intersect_p (pt1->vars, pt2->vars)); | |
6189 | } | |
6190 | ||
6191 | bool | |
6192 | pt_solutions_intersect (struct pt_solution *pt1, struct pt_solution *pt2) | |
6193 | { | |
6194 | bool res = pt_solutions_intersect_1 (pt1, pt2); | |
6195 | if (res) | |
6196 | ++pta_stats.pt_solutions_intersect_may_alias; | |
6197 | else | |
6198 | ++pta_stats.pt_solutions_intersect_no_alias; | |
6199 | return res; | |
15c15196 RG |
6200 | } |
6201 | ||
b7091901 | 6202 | |
63a4ef6f DN |
6203 | /* Dump points-to information to OUTFILE. */ |
6204 | ||
5006671f | 6205 | static void |
910fdc79 DB |
6206 | dump_sa_points_to_info (FILE *outfile) |
6207 | { | |
910fdc79 | 6208 | unsigned int i; |
63a4ef6f | 6209 | |
e8ca4159 | 6210 | fprintf (outfile, "\nPoints-to sets\n\n"); |
63a4ef6f | 6211 | |
910fdc79 DB |
6212 | if (dump_flags & TDF_STATS) |
6213 | { | |
6214 | fprintf (outfile, "Stats:\n"); | |
63a4ef6f | 6215 | fprintf (outfile, "Total vars: %d\n", stats.total_vars); |
3e5937d7 DB |
6216 | fprintf (outfile, "Non-pointer vars: %d\n", |
6217 | stats.nonpointer_vars); | |
63a4ef6f DN |
6218 | fprintf (outfile, "Statically unified vars: %d\n", |
6219 | stats.unified_vars_static); | |
63a4ef6f DN |
6220 | fprintf (outfile, "Dynamically unified vars: %d\n", |
6221 | stats.unified_vars_dynamic); | |
6222 | fprintf (outfile, "Iterations: %d\n", stats.iterations); | |
4ee00913 | 6223 | fprintf (outfile, "Number of edges: %d\n", stats.num_edges); |
3e5937d7 DB |
6224 | fprintf (outfile, "Number of implicit edges: %d\n", |
6225 | stats.num_implicit_edges); | |
910fdc79 | 6226 | } |
63a4ef6f | 6227 | |
910fdc79 | 6228 | for (i = 0; i < VEC_length (varinfo_t, varmap); i++) |
25a6a873 RG |
6229 | { |
6230 | varinfo_t vi = get_varinfo (i); | |
6231 | if (!vi->may_have_pointers) | |
b28ae58f | 6232 | continue; |
25a6a873 RG |
6233 | dump_solution_for_var (outfile, i); |
6234 | } | |
910fdc79 DB |
6235 | } |
6236 | ||
6237 | ||
63a4ef6f DN |
6238 | /* Debug points-to information to stderr. */ |
6239 | ||
24e47c76 | 6240 | DEBUG_FUNCTION void |
63a4ef6f DN |
6241 | debug_sa_points_to_info (void) |
6242 | { | |
6243 | dump_sa_points_to_info (stderr); | |
6244 | } | |
6245 | ||
6246 | ||
910fdc79 DB |
6247 | /* Initialize the always-existing constraint variables for NULL |
6248 | ANYTHING, READONLY, and INTEGER */ | |
6249 | ||
6250 | static void | |
6251 | init_base_vars (void) | |
6252 | { | |
6253 | struct constraint_expr lhs, rhs; | |
0bbf2ffa RG |
6254 | varinfo_t var_anything; |
6255 | varinfo_t var_nothing; | |
6256 | varinfo_t var_readonly; | |
6257 | varinfo_t var_escaped; | |
6258 | varinfo_t var_nonlocal; | |
0bbf2ffa RG |
6259 | varinfo_t var_storedanything; |
6260 | varinfo_t var_integer; | |
910fdc79 DB |
6261 | |
6262 | /* Create the NULL variable, used to represent that a variable points | |
6263 | to NULL. */ | |
0bbf2ffa RG |
6264 | var_nothing = new_var_info (NULL_TREE, "NULL"); |
6265 | gcc_assert (var_nothing->id == nothing_id); | |
910fdc79 DB |
6266 | var_nothing->is_artificial_var = 1; |
6267 | var_nothing->offset = 0; | |
6268 | var_nothing->size = ~0; | |
6269 | var_nothing->fullsize = ~0; | |
13c2c08b | 6270 | var_nothing->is_special_var = 1; |
b28ae58f RG |
6271 | var_nothing->may_have_pointers = 0; |
6272 | var_nothing->is_global_var = 0; | |
910fdc79 DB |
6273 | |
6274 | /* Create the ANYTHING variable, used to represent that a variable | |
6275 | points to some unknown piece of memory. */ | |
0bbf2ffa RG |
6276 | var_anything = new_var_info (NULL_TREE, "ANYTHING"); |
6277 | gcc_assert (var_anything->id == anything_id); | |
910fdc79 DB |
6278 | var_anything->is_artificial_var = 1; |
6279 | var_anything->size = ~0; | |
6280 | var_anything->offset = 0; | |
6281 | var_anything->next = NULL; | |
6282 | var_anything->fullsize = ~0; | |
13c2c08b | 6283 | var_anything->is_special_var = 1; |
910fdc79 DB |
6284 | |
6285 | /* Anything points to anything. This makes deref constraints just | |
c58936b6 | 6286 | work in the presence of linked list and other p = *p type loops, |
910fdc79 | 6287 | by saying that *ANYTHING = ANYTHING. */ |
910fdc79 DB |
6288 | lhs.type = SCALAR; |
6289 | lhs.var = anything_id; | |
6290 | lhs.offset = 0; | |
3e5937d7 | 6291 | rhs.type = ADDRESSOF; |
910fdc79 DB |
6292 | rhs.var = anything_id; |
6293 | rhs.offset = 0; | |
e8ca4159 | 6294 | |
a5eadacc DB |
6295 | /* This specifically does not use process_constraint because |
6296 | process_constraint ignores all anything = anything constraints, since all | |
6297 | but this one are redundant. */ | |
b5efa470 | 6298 | VEC_safe_push (constraint_t, heap, constraints, new_constraint (lhs, rhs)); |
c58936b6 | 6299 | |
910fdc79 DB |
6300 | /* Create the READONLY variable, used to represent that a variable |
6301 | points to readonly memory. */ | |
0bbf2ffa RG |
6302 | var_readonly = new_var_info (NULL_TREE, "READONLY"); |
6303 | gcc_assert (var_readonly->id == readonly_id); | |
910fdc79 DB |
6304 | var_readonly->is_artificial_var = 1; |
6305 | var_readonly->offset = 0; | |
6306 | var_readonly->size = ~0; | |
6307 | var_readonly->fullsize = ~0; | |
6308 | var_readonly->next = NULL; | |
13c2c08b | 6309 | var_readonly->is_special_var = 1; |
910fdc79 DB |
6310 | |
6311 | /* readonly memory points to anything, in order to make deref | |
6312 | easier. In reality, it points to anything the particular | |
6313 | readonly variable can point to, but we don't track this | |
607fb860 | 6314 | separately. */ |
910fdc79 DB |
6315 | lhs.type = SCALAR; |
6316 | lhs.var = readonly_id; | |
6317 | lhs.offset = 0; | |
3e5937d7 | 6318 | rhs.type = ADDRESSOF; |
b7091901 | 6319 | rhs.var = readonly_id; /* FIXME */ |
910fdc79 | 6320 | rhs.offset = 0; |
b7091901 | 6321 | process_constraint (new_constraint (lhs, rhs)); |
c58936b6 | 6322 | |
b7091901 RG |
6323 | /* Create the ESCAPED variable, used to represent the set of escaped |
6324 | memory. */ | |
0bbf2ffa RG |
6325 | var_escaped = new_var_info (NULL_TREE, "ESCAPED"); |
6326 | gcc_assert (var_escaped->id == escaped_id); | |
b7091901 RG |
6327 | var_escaped->is_artificial_var = 1; |
6328 | var_escaped->offset = 0; | |
6329 | var_escaped->size = ~0; | |
6330 | var_escaped->fullsize = ~0; | |
6331 | var_escaped->is_special_var = 0; | |
b7091901 | 6332 | |
b7091901 RG |
6333 | /* Create the NONLOCAL variable, used to represent the set of nonlocal |
6334 | memory. */ | |
0bbf2ffa RG |
6335 | var_nonlocal = new_var_info (NULL_TREE, "NONLOCAL"); |
6336 | gcc_assert (var_nonlocal->id == nonlocal_id); | |
b7091901 RG |
6337 | var_nonlocal->is_artificial_var = 1; |
6338 | var_nonlocal->offset = 0; | |
6339 | var_nonlocal->size = ~0; | |
6340 | var_nonlocal->fullsize = ~0; | |
6341 | var_nonlocal->is_special_var = 1; | |
b7091901 | 6342 | |
5006671f RG |
6343 | /* ESCAPED = *ESCAPED, because escaped is may-deref'd at calls, etc. */ |
6344 | lhs.type = SCALAR; | |
6345 | lhs.var = escaped_id; | |
6346 | lhs.offset = 0; | |
6347 | rhs.type = DEREF; | |
6348 | rhs.var = escaped_id; | |
6349 | rhs.offset = 0; | |
6350 | process_constraint (new_constraint (lhs, rhs)); | |
6351 | ||
6352 | /* ESCAPED = ESCAPED + UNKNOWN_OFFSET, because if a sub-field escapes the | |
6353 | whole variable escapes. */ | |
6354 | lhs.type = SCALAR; | |
6355 | lhs.var = escaped_id; | |
6356 | lhs.offset = 0; | |
6357 | rhs.type = SCALAR; | |
6358 | rhs.var = escaped_id; | |
6359 | rhs.offset = UNKNOWN_OFFSET; | |
6360 | process_constraint (new_constraint (lhs, rhs)); | |
6361 | ||
6362 | /* *ESCAPED = NONLOCAL. This is true because we have to assume | |
6363 | everything pointed to by escaped points to what global memory can | |
6364 | point to. */ | |
6365 | lhs.type = DEREF; | |
6366 | lhs.var = escaped_id; | |
6367 | lhs.offset = 0; | |
6368 | rhs.type = SCALAR; | |
6369 | rhs.var = nonlocal_id; | |
6370 | rhs.offset = 0; | |
6371 | process_constraint (new_constraint (lhs, rhs)); | |
6372 | ||
6373 | /* NONLOCAL = &NONLOCAL, NONLOCAL = &ESCAPED. This is true because | |
6374 | global memory may point to global memory and escaped memory. */ | |
b7091901 RG |
6375 | lhs.type = SCALAR; |
6376 | lhs.var = nonlocal_id; | |
6377 | lhs.offset = 0; | |
6378 | rhs.type = ADDRESSOF; | |
5006671f RG |
6379 | rhs.var = nonlocal_id; |
6380 | rhs.offset = 0; | |
6381 | process_constraint (new_constraint (lhs, rhs)); | |
6382 | rhs.type = ADDRESSOF; | |
b7091901 RG |
6383 | rhs.var = escaped_id; |
6384 | rhs.offset = 0; | |
910fdc79 | 6385 | process_constraint (new_constraint (lhs, rhs)); |
c58936b6 | 6386 | |
9e39dba6 RG |
6387 | /* Create the STOREDANYTHING variable, used to represent the set of |
6388 | variables stored to *ANYTHING. */ | |
0bbf2ffa RG |
6389 | var_storedanything = new_var_info (NULL_TREE, "STOREDANYTHING"); |
6390 | gcc_assert (var_storedanything->id == storedanything_id); | |
9e39dba6 RG |
6391 | var_storedanything->is_artificial_var = 1; |
6392 | var_storedanything->offset = 0; | |
6393 | var_storedanything->size = ~0; | |
6394 | var_storedanything->fullsize = ~0; | |
6395 | var_storedanything->is_special_var = 0; | |
9e39dba6 | 6396 | |
910fdc79 | 6397 | /* Create the INTEGER variable, used to represent that a variable points |
5006671f | 6398 | to what an INTEGER "points to". */ |
0bbf2ffa RG |
6399 | var_integer = new_var_info (NULL_TREE, "INTEGER"); |
6400 | gcc_assert (var_integer->id == integer_id); | |
910fdc79 DB |
6401 | var_integer->is_artificial_var = 1; |
6402 | var_integer->size = ~0; | |
6403 | var_integer->fullsize = ~0; | |
6404 | var_integer->offset = 0; | |
6405 | var_integer->next = NULL; | |
13c2c08b | 6406 | var_integer->is_special_var = 1; |
a5eadacc | 6407 | |
21392f19 DB |
6408 | /* INTEGER = ANYTHING, because we don't know where a dereference of |
6409 | a random integer will point to. */ | |
a5eadacc DB |
6410 | lhs.type = SCALAR; |
6411 | lhs.var = integer_id; | |
6412 | lhs.offset = 0; | |
3e5937d7 | 6413 | rhs.type = ADDRESSOF; |
a5eadacc DB |
6414 | rhs.var = anything_id; |
6415 | rhs.offset = 0; | |
6416 | process_constraint (new_constraint (lhs, rhs)); | |
c58936b6 | 6417 | } |
910fdc79 | 6418 | |
4ee00913 | 6419 | /* Initialize things necessary to perform PTA */ |
910fdc79 | 6420 | |
4ee00913 DB |
6421 | static void |
6422 | init_alias_vars (void) | |
910fdc79 | 6423 | { |
e5bae89b RG |
6424 | use_field_sensitive = (MAX_FIELDS_FOR_FIELD_SENSITIVE > 1); |
6425 | ||
3e5937d7 DB |
6426 | bitmap_obstack_initialize (&pta_obstack); |
6427 | bitmap_obstack_initialize (&oldpta_obstack); | |
4ee00913 | 6428 | bitmap_obstack_initialize (&predbitmap_obstack); |
910fdc79 | 6429 | |
c58936b6 | 6430 | constraint_pool = create_alloc_pool ("Constraint pool", |
910fdc79 DB |
6431 | sizeof (struct constraint), 30); |
6432 | variable_info_pool = create_alloc_pool ("Variable info pool", | |
6433 | sizeof (struct variable_info), 30); | |
b5efa470 DB |
6434 | constraints = VEC_alloc (constraint_t, heap, 8); |
6435 | varmap = VEC_alloc (varinfo_t, heap, 8); | |
15814ba0 | 6436 | vi_for_tree = pointer_map_create (); |
3e8542ca | 6437 | call_stmt_vars = pointer_map_create (); |
3e5937d7 | 6438 | |
910fdc79 | 6439 | memset (&stats, 0, sizeof (stats)); |
1296c31f DB |
6440 | shared_bitmap_table = htab_create (511, shared_bitmap_hash, |
6441 | shared_bitmap_eq, free); | |
910fdc79 | 6442 | init_base_vars (); |
7d6e2521 RG |
6443 | |
6444 | gcc_obstack_init (&fake_var_decl_obstack); | |
4ee00913 DB |
6445 | } |
6446 | ||
3e5937d7 DB |
6447 | /* Remove the REF and ADDRESS edges from GRAPH, as well as all the |
6448 | predecessor edges. */ | |
6449 | ||
6450 | static void | |
6451 | remove_preds_and_fake_succs (constraint_graph_t graph) | |
6452 | { | |
6453 | unsigned int i; | |
6454 | ||
6455 | /* Clear the implicit ref and address nodes from the successor | |
6456 | lists. */ | |
6457 | for (i = 0; i < FIRST_REF_NODE; i++) | |
6458 | { | |
6459 | if (graph->succs[i]) | |
6460 | bitmap_clear_range (graph->succs[i], FIRST_REF_NODE, | |
6461 | FIRST_REF_NODE * 2); | |
6462 | } | |
6463 | ||
6464 | /* Free the successor list for the non-ref nodes. */ | |
6465 | for (i = FIRST_REF_NODE; i < graph->size; i++) | |
6466 | { | |
6467 | if (graph->succs[i]) | |
6468 | BITMAP_FREE (graph->succs[i]); | |
6469 | } | |
6470 | ||
6471 | /* Now reallocate the size of the successor list as, and blow away | |
6472 | the predecessor bitmaps. */ | |
6473 | graph->size = VEC_length (varinfo_t, varmap); | |
c22940cd | 6474 | graph->succs = XRESIZEVEC (bitmap, graph->succs, graph->size); |
3e5937d7 DB |
6475 | |
6476 | free (graph->implicit_preds); | |
6477 | graph->implicit_preds = NULL; | |
6478 | free (graph->preds); | |
6479 | graph->preds = NULL; | |
6480 | bitmap_obstack_release (&predbitmap_obstack); | |
6481 | } | |
6482 | ||
5c245b95 | 6483 | /* Solve the constraint set. */ |
4ee00913 | 6484 | |
5006671f | 6485 | static void |
5c245b95 | 6486 | solve_constraints (void) |
4ee00913 | 6487 | { |
3e5937d7 | 6488 | struct scc_info *si; |
910fdc79 | 6489 | |
21392f19 DB |
6490 | if (dump_file) |
6491 | fprintf (dump_file, | |
6492 | "\nCollapsing static cycles and doing variable " | |
7b765bed DB |
6493 | "substitution\n"); |
6494 | ||
6495 | init_graph (VEC_length (varinfo_t, varmap) * 2); | |
b8698a0f | 6496 | |
7b765bed DB |
6497 | if (dump_file) |
6498 | fprintf (dump_file, "Building predecessor graph\n"); | |
3e5937d7 | 6499 | build_pred_graph (); |
b8698a0f | 6500 | |
7b765bed DB |
6501 | if (dump_file) |
6502 | fprintf (dump_file, "Detecting pointer and location " | |
6503 | "equivalences\n"); | |
3e5937d7 | 6504 | si = perform_var_substitution (graph); |
b8698a0f | 6505 | |
7b765bed DB |
6506 | if (dump_file) |
6507 | fprintf (dump_file, "Rewriting constraints and unifying " | |
6508 | "variables\n"); | |
6509 | rewrite_constraints (graph, si); | |
fc93bcb6 | 6510 | |
8576f20a | 6511 | build_succ_graph (); |
fc93bcb6 | 6512 | |
8d3e3924 RG |
6513 | free_var_substitution_info (si); |
6514 | ||
8576f20a | 6515 | /* Attach complex constraints to graph nodes. */ |
7b765bed DB |
6516 | move_complex_constraints (graph); |
6517 | ||
6518 | if (dump_file) | |
6519 | fprintf (dump_file, "Uniting pointer but not location equivalent " | |
6520 | "variables\n"); | |
6521 | unite_pointer_equivalences (graph); | |
6522 | ||
6523 | if (dump_file) | |
6524 | fprintf (dump_file, "Finding indirect cycles\n"); | |
3e5937d7 | 6525 | find_indirect_cycles (graph); |
c58936b6 | 6526 | |
3e5937d7 DB |
6527 | /* Implicit nodes and predecessors are no longer necessary at this |
6528 | point. */ | |
6529 | remove_preds_and_fake_succs (graph); | |
c58936b6 | 6530 | |
8576f20a RG |
6531 | if (dump_file && (dump_flags & TDF_GRAPH)) |
6532 | { | |
6533 | fprintf (dump_file, "\n\n// The constraint graph before solve-graph " | |
6534 | "in dot format:\n"); | |
6535 | dump_constraint_graph (dump_file); | |
6536 | fprintf (dump_file, "\n\n"); | |
6537 | } | |
6538 | ||
21392f19 | 6539 | if (dump_file) |
7b765bed | 6540 | fprintf (dump_file, "Solving graph\n"); |
c58936b6 | 6541 | |
21392f19 | 6542 | solve_graph (graph); |
c58936b6 | 6543 | |
8576f20a RG |
6544 | if (dump_file && (dump_flags & TDF_GRAPH)) |
6545 | { | |
6546 | fprintf (dump_file, "\n\n// The constraint graph after solve-graph " | |
6547 | "in dot format:\n"); | |
6548 | dump_constraint_graph (dump_file); | |
6549 | fprintf (dump_file, "\n\n"); | |
6550 | } | |
6551 | ||
910fdc79 DB |
6552 | if (dump_file) |
6553 | dump_sa_points_to_info (dump_file); | |
5c245b95 RG |
6554 | } |
6555 | ||
6556 | /* Create points-to sets for the current function. See the comments | |
6557 | at the start of the file for an algorithmic overview. */ | |
6558 | ||
6559 | static void | |
6560 | compute_points_to_sets (void) | |
6561 | { | |
6562 | basic_block bb; | |
6563 | unsigned i; | |
6564 | varinfo_t vi; | |
6565 | ||
6566 | timevar_push (TV_TREE_PTA); | |
6567 | ||
6568 | init_alias_vars (); | |
5c245b95 RG |
6569 | |
6570 | intra_create_variable_infos (); | |
6571 | ||
25a6a873 | 6572 | /* Now walk all statements and build the constraint set. */ |
5c245b95 RG |
6573 | FOR_EACH_BB (bb) |
6574 | { | |
6575 | gimple_stmt_iterator gsi; | |
6576 | ||
6577 | for (gsi = gsi_start_phis (bb); !gsi_end_p (gsi); gsi_next (&gsi)) | |
6578 | { | |
6579 | gimple phi = gsi_stmt (gsi); | |
6580 | ||
6581 | if (is_gimple_reg (gimple_phi_result (phi))) | |
6582 | find_func_aliases (phi); | |
6583 | } | |
6584 | ||
6585 | for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi)) | |
6586 | { | |
6587 | gimple stmt = gsi_stmt (gsi); | |
6588 | ||
6589 | find_func_aliases (stmt); | |
6590 | } | |
6591 | } | |
6592 | ||
25a6a873 RG |
6593 | if (dump_file) |
6594 | { | |
6595 | fprintf (dump_file, "Points-to analysis\n\nConstraints:\n\n"); | |
6596 | dump_constraints (dump_file, 0); | |
6597 | } | |
6598 | ||
5c245b95 RG |
6599 | /* From the constraints compute the points-to sets. */ |
6600 | solve_constraints (); | |
c58936b6 | 6601 | |
3e8542ca | 6602 | /* Compute the points-to set for ESCAPED used for call-clobber analysis. */ |
0bbf2ffa RG |
6603 | find_what_var_points_to (get_varinfo (escaped_id), |
6604 | &cfun->gimple_df->escaped); | |
5006671f RG |
6605 | |
6606 | /* Make sure the ESCAPED solution (which is used as placeholder in | |
6607 | other solutions) does not reference itself. This simplifies | |
6608 | points-to solution queries. */ | |
6609 | cfun->gimple_df->escaped.escaped = 0; | |
6610 | ||
14c41b9b | 6611 | /* Mark escaped HEAP variables as global. */ |
ac47786e | 6612 | FOR_EACH_VEC_ELT (varinfo_t, varmap, i, vi) |
14c41b9b RG |
6613 | if (vi->is_heap_var |
6614 | && !vi->is_global_var) | |
91deb937 RG |
6615 | DECL_EXTERNAL (vi->decl) = vi->is_global_var |
6616 | = pt_solution_includes (&cfun->gimple_df->escaped, vi->decl); | |
14c41b9b | 6617 | |
5006671f RG |
6618 | /* Compute the points-to sets for pointer SSA_NAMEs. */ |
6619 | for (i = 0; i < num_ssa_names; ++i) | |
6620 | { | |
6621 | tree ptr = ssa_name (i); | |
6622 | if (ptr | |
6623 | && POINTER_TYPE_P (TREE_TYPE (ptr))) | |
4d7a65ea | 6624 | find_what_p_points_to (ptr); |
5006671f | 6625 | } |
e8ca4159 | 6626 | |
d086d311 RG |
6627 | /* Compute the call-used/clobbered sets. */ |
6628 | FOR_EACH_BB (bb) | |
6629 | { | |
6630 | gimple_stmt_iterator gsi; | |
6631 | ||
6632 | for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi)) | |
6633 | { | |
6634 | gimple stmt = gsi_stmt (gsi); | |
6635 | struct pt_solution *pt; | |
6636 | if (!is_gimple_call (stmt)) | |
6637 | continue; | |
6638 | ||
6639 | pt = gimple_call_use_set (stmt); | |
6640 | if (gimple_call_flags (stmt) & ECF_CONST) | |
6641 | memset (pt, 0, sizeof (struct pt_solution)); | |
3e8542ca | 6642 | else if ((vi = lookup_call_use_vi (stmt)) != NULL) |
d086d311 | 6643 | { |
3e8542ca RG |
6644 | find_what_var_points_to (vi, pt); |
6645 | /* Escaped (and thus nonlocal) variables are always | |
6646 | implicitly used by calls. */ | |
d086d311 RG |
6647 | /* ??? ESCAPED can be empty even though NONLOCAL |
6648 | always escaped. */ | |
6649 | pt->nonlocal = 1; | |
6650 | pt->escaped = 1; | |
6651 | } | |
6652 | else | |
6653 | { | |
3e8542ca RG |
6654 | /* If there is nothing special about this call then |
6655 | we have made everything that is used also escape. */ | |
d086d311 RG |
6656 | *pt = cfun->gimple_df->escaped; |
6657 | pt->nonlocal = 1; | |
6658 | } | |
6659 | ||
6660 | pt = gimple_call_clobber_set (stmt); | |
6661 | if (gimple_call_flags (stmt) & (ECF_CONST|ECF_PURE|ECF_NOVOPS)) | |
6662 | memset (pt, 0, sizeof (struct pt_solution)); | |
3e8542ca RG |
6663 | else if ((vi = lookup_call_clobber_vi (stmt)) != NULL) |
6664 | { | |
6665 | find_what_var_points_to (vi, pt); | |
6666 | /* Escaped (and thus nonlocal) variables are always | |
6667 | implicitly clobbered by calls. */ | |
6668 | /* ??? ESCAPED can be empty even though NONLOCAL | |
6669 | always escaped. */ | |
6670 | pt->nonlocal = 1; | |
6671 | pt->escaped = 1; | |
6672 | } | |
d086d311 RG |
6673 | else |
6674 | { | |
3e8542ca RG |
6675 | /* If there is nothing special about this call then |
6676 | we have made everything that is used also escape. */ | |
d086d311 RG |
6677 | *pt = cfun->gimple_df->escaped; |
6678 | pt->nonlocal = 1; | |
6679 | } | |
6680 | } | |
6681 | } | |
6682 | ||
e8ca4159 | 6683 | timevar_pop (TV_TREE_PTA); |
910fdc79 DB |
6684 | } |
6685 | ||
910fdc79 DB |
6686 | |
6687 | /* Delete created points-to sets. */ | |
6688 | ||
5006671f | 6689 | static void |
e8ca4159 | 6690 | delete_points_to_sets (void) |
910fdc79 | 6691 | { |
7b765bed | 6692 | unsigned int i; |
c58936b6 | 6693 | |
1296c31f | 6694 | htab_delete (shared_bitmap_table); |
3e5937d7 DB |
6695 | if (dump_file && (dump_flags & TDF_STATS)) |
6696 | fprintf (dump_file, "Points to sets created:%d\n", | |
6697 | stats.points_to_sets_created); | |
6698 | ||
15814ba0 | 6699 | pointer_map_destroy (vi_for_tree); |
3e8542ca | 6700 | pointer_map_destroy (call_stmt_vars); |
3e5937d7 | 6701 | bitmap_obstack_release (&pta_obstack); |
b5efa470 | 6702 | VEC_free (constraint_t, heap, constraints); |
c58936b6 | 6703 | |
7b765bed | 6704 | for (i = 0; i < graph->size; i++) |
3e5937d7 | 6705 | VEC_free (constraint_t, heap, graph->complex[i]); |
285463b5 | 6706 | free (graph->complex); |
21392f19 | 6707 | |
3e5937d7 | 6708 | free (graph->rep); |
57250223 | 6709 | free (graph->succs); |
7b765bed DB |
6710 | free (graph->pe); |
6711 | free (graph->pe_rep); | |
3e5937d7 | 6712 | free (graph->indirect_cycles); |
b5efa470 DB |
6713 | free (graph); |
6714 | ||
6715 | VEC_free (varinfo_t, heap, varmap); | |
910fdc79 | 6716 | free_alloc_pool (variable_info_pool); |
c58936b6 | 6717 | free_alloc_pool (constraint_pool); |
7d6e2521 RG |
6718 | |
6719 | obstack_free (&fake_var_decl_obstack, NULL); | |
910fdc79 | 6720 | } |
973162ec | 6721 | |
5006671f RG |
6722 | |
6723 | /* Compute points-to information for every SSA_NAME pointer in the | |
6724 | current function and compute the transitive closure of escaped | |
6725 | variables to re-initialize the call-clobber states of local variables. */ | |
6726 | ||
6727 | unsigned int | |
6728 | compute_may_aliases (void) | |
6729 | { | |
25a6a873 RG |
6730 | if (cfun->gimple_df->ipa_pta) |
6731 | { | |
6732 | if (dump_file) | |
6733 | { | |
6734 | fprintf (dump_file, "\nNot re-computing points-to information " | |
6735 | "because IPA points-to information is available.\n\n"); | |
6736 | ||
6737 | /* But still dump what we have remaining it. */ | |
6738 | dump_alias_info (dump_file); | |
25a6a873 RG |
6739 | } |
6740 | ||
6741 | return 0; | |
6742 | } | |
6743 | ||
5006671f RG |
6744 | /* For each pointer P_i, determine the sets of variables that P_i may |
6745 | point-to. Compute the reachability set of escaped and call-used | |
6746 | variables. */ | |
6747 | compute_points_to_sets (); | |
6748 | ||
6749 | /* Debugging dumps. */ | |
6750 | if (dump_file) | |
824f71b9 | 6751 | dump_alias_info (dump_file); |
5006671f RG |
6752 | |
6753 | /* Deallocate memory used by aliasing data structures and the internal | |
6754 | points-to solution. */ | |
6755 | delete_points_to_sets (); | |
6756 | ||
6757 | gcc_assert (!need_ssa_update_p (cfun)); | |
6758 | ||
6759 | return 0; | |
6760 | } | |
6761 | ||
248fc9f3 RG |
6762 | static bool |
6763 | gate_tree_pta (void) | |
6764 | { | |
6765 | return flag_tree_pta; | |
6766 | } | |
5006671f RG |
6767 | |
6768 | /* A dummy pass to cause points-to information to be computed via | |
6769 | TODO_rebuild_alias. */ | |
6770 | ||
6771 | struct gimple_opt_pass pass_build_alias = | |
6772 | { | |
6773 | { | |
6774 | GIMPLE_PASS, | |
6775 | "alias", /* name */ | |
248fc9f3 | 6776 | gate_tree_pta, /* gate */ |
5006671f RG |
6777 | NULL, /* execute */ |
6778 | NULL, /* sub */ | |
6779 | NULL, /* next */ | |
6780 | 0, /* static_pass_number */ | |
7072a650 | 6781 | TV_NONE, /* tv_id */ |
5006671f | 6782 | PROP_cfg | PROP_ssa, /* properties_required */ |
4effdf02 | 6783 | 0, /* properties_provided */ |
5006671f RG |
6784 | 0, /* properties_destroyed */ |
6785 | 0, /* todo_flags_start */ | |
22c5fa5f | 6786 | TODO_rebuild_alias /* todo_flags_finish */ |
5006671f RG |
6787 | } |
6788 | }; | |
6789 | ||
6b8ed145 RG |
6790 | /* A dummy pass to cause points-to information to be computed via |
6791 | TODO_rebuild_alias. */ | |
6792 | ||
6793 | struct gimple_opt_pass pass_build_ealias = | |
6794 | { | |
6795 | { | |
6796 | GIMPLE_PASS, | |
6797 | "ealias", /* name */ | |
6798 | gate_tree_pta, /* gate */ | |
6799 | NULL, /* execute */ | |
6800 | NULL, /* sub */ | |
6801 | NULL, /* next */ | |
6802 | 0, /* static_pass_number */ | |
6803 | TV_NONE, /* tv_id */ | |
6804 | PROP_cfg | PROP_ssa, /* properties_required */ | |
6805 | 0, /* properties_provided */ | |
6806 | 0, /* properties_destroyed */ | |
6807 | 0, /* todo_flags_start */ | |
22c5fa5f | 6808 | TODO_rebuild_alias /* todo_flags_finish */ |
6b8ed145 RG |
6809 | } |
6810 | }; | |
6811 | ||
5006671f | 6812 | |
4ee00913 DB |
6813 | /* Return true if we should execute IPA PTA. */ |
6814 | static bool | |
6815 | gate_ipa_pta (void) | |
6816 | { | |
de925a03 RG |
6817 | return (optimize |
6818 | && flag_ipa_pta | |
4ee00913 | 6819 | /* Don't bother doing anything if the program has errors. */ |
1da2ed5f | 6820 | && !seen_error ()); |
4ee00913 DB |
6821 | } |
6822 | ||
25a6a873 RG |
6823 | /* IPA PTA solutions for ESCAPED. */ |
6824 | struct pt_solution ipa_escaped_pt | |
d3553615 | 6825 | = { true, false, false, false, false, false, NULL }; |
25a6a873 | 6826 | |
39e2db00 JH |
6827 | /* Associate node with varinfo DATA. Worker for |
6828 | cgraph_for_node_and_aliases. */ | |
6829 | static bool | |
6830 | associate_varinfo_to_alias (struct cgraph_node *node, void *data) | |
6831 | { | |
6832 | if (node->alias || node->thunk.thunk_p) | |
960bfb69 | 6833 | insert_vi_for_tree (node->symbol.decl, (varinfo_t)data); |
39e2db00 JH |
6834 | return false; |
6835 | } | |
6836 | ||
4ee00913 | 6837 | /* Execute the driver for IPA PTA. */ |
c2924966 | 6838 | static unsigned int |
4ee00913 DB |
6839 | ipa_pta_execute (void) |
6840 | { | |
6841 | struct cgraph_node *node; | |
25a6a873 RG |
6842 | struct varpool_node *var; |
6843 | int from; | |
3e5937d7 | 6844 | |
4ee00913 | 6845 | in_ipa_mode = 1; |
5c245b95 | 6846 | |
4ee00913 | 6847 | init_alias_vars (); |
c58936b6 | 6848 | |
1565af08 RG |
6849 | if (dump_file && (dump_flags & TDF_DETAILS)) |
6850 | { | |
8f940ee6 | 6851 | dump_symtab (dump_file); |
1565af08 RG |
6852 | fprintf (dump_file, "\n"); |
6853 | } | |
6854 | ||
5c245b95 | 6855 | /* Build the constraints. */ |
65c70e6b | 6856 | FOR_EACH_DEFINED_FUNCTION (node) |
4ee00913 | 6857 | { |
27c2cfa6 | 6858 | varinfo_t vi; |
5c245b95 RG |
6859 | /* Nodes without a body are not interesting. Especially do not |
6860 | visit clones at this point for now - we get duplicate decls | |
6861 | there for inline clones at least. */ | |
1565af08 | 6862 | if (!cgraph_function_with_gimple_body_p (node)) |
5c245b95 RG |
6863 | continue; |
6864 | ||
1565af08 RG |
6865 | gcc_assert (!node->clone_of); |
6866 | ||
960bfb69 JH |
6867 | vi = create_function_info_for (node->symbol.decl, |
6868 | alias_get_name (node->symbol.decl)); | |
39e2db00 | 6869 | cgraph_for_node_and_aliases (node, associate_varinfo_to_alias, vi, true); |
4ee00913 | 6870 | } |
5c245b95 | 6871 | |
25a6a873 | 6872 | /* Create constraints for global variables and their initializers. */ |
65c70e6b | 6873 | FOR_EACH_VARIABLE (var) |
27c2cfa6 | 6874 | { |
cd35bcf7 JH |
6875 | if (var->alias) |
6876 | continue; | |
27c2cfa6 | 6877 | |
960bfb69 | 6878 | get_vi_for_tree (var->symbol.decl); |
27c2cfa6 | 6879 | } |
25a6a873 RG |
6880 | |
6881 | if (dump_file) | |
6882 | { | |
6883 | fprintf (dump_file, | |
6884 | "Generating constraints for global initializers\n\n"); | |
6885 | dump_constraints (dump_file, 0); | |
6886 | fprintf (dump_file, "\n"); | |
6887 | } | |
6888 | from = VEC_length (constraint_t, constraints); | |
6889 | ||
65c70e6b | 6890 | FOR_EACH_DEFINED_FUNCTION (node) |
4ee00913 | 6891 | { |
5c245b95 RG |
6892 | struct function *func; |
6893 | basic_block bb; | |
6894 | tree old_func_decl; | |
4ee00913 | 6895 | |
5c245b95 | 6896 | /* Nodes without a body are not interesting. */ |
1565af08 | 6897 | if (!cgraph_function_with_gimple_body_p (node)) |
5c245b95 | 6898 | continue; |
c58936b6 | 6899 | |
5c245b95 | 6900 | if (dump_file) |
27c2cfa6 RG |
6901 | { |
6902 | fprintf (dump_file, | |
6903 | "Generating constraints for %s", cgraph_node_name (node)); | |
960bfb69 | 6904 | if (DECL_ASSEMBLER_NAME_SET_P (node->symbol.decl)) |
27c2cfa6 | 6905 | fprintf (dump_file, " (%s)", |
960bfb69 JH |
6906 | IDENTIFIER_POINTER |
6907 | (DECL_ASSEMBLER_NAME (node->symbol.decl))); | |
27c2cfa6 RG |
6908 | fprintf (dump_file, "\n"); |
6909 | } | |
c58936b6 | 6910 | |
960bfb69 | 6911 | func = DECL_STRUCT_FUNCTION (node->symbol.decl); |
5c245b95 RG |
6912 | old_func_decl = current_function_decl; |
6913 | push_cfun (func); | |
960bfb69 | 6914 | current_function_decl = node->symbol.decl; |
726a989a | 6915 | |
1565af08 RG |
6916 | /* For externally visible or attribute used annotated functions use |
6917 | local constraints for their arguments. | |
6918 | For local functions we see all callers and thus do not need initial | |
6919 | constraints for parameters. */ | |
960bfb69 JH |
6920 | if (node->symbol.used_from_other_partition |
6921 | || node->symbol.externally_visible | |
ead84f73 | 6922 | || node->symbol.force_output) |
194313e2 | 6923 | { |
194313e2 RG |
6924 | intra_create_variable_infos (); |
6925 | ||
6926 | /* We also need to make function return values escape. Nothing | |
6927 | escapes by returning from main though. */ | |
960bfb69 | 6928 | if (!MAIN_NAME_P (DECL_NAME (node->symbol.decl))) |
194313e2 RG |
6929 | { |
6930 | varinfo_t fi, rvi; | |
960bfb69 | 6931 | fi = lookup_vi_for_tree (node->symbol.decl); |
194313e2 RG |
6932 | rvi = first_vi_for_offset (fi, fi_result); |
6933 | if (rvi && rvi->offset == fi_result) | |
6934 | { | |
6935 | struct constraint_expr includes; | |
6936 | struct constraint_expr var; | |
6937 | includes.var = escaped_id; | |
6938 | includes.offset = 0; | |
6939 | includes.type = SCALAR; | |
6940 | var.var = rvi->id; | |
6941 | var.offset = 0; | |
6942 | var.type = SCALAR; | |
6943 | process_constraint (new_constraint (includes, var)); | |
6944 | } | |
6945 | } | |
6946 | } | |
4ee00913 | 6947 | |
5c245b95 RG |
6948 | /* Build constriants for the function body. */ |
6949 | FOR_EACH_BB_FN (bb, func) | |
6950 | { | |
6951 | gimple_stmt_iterator gsi; | |
c58936b6 | 6952 | |
5c245b95 RG |
6953 | for (gsi = gsi_start_phis (bb); !gsi_end_p (gsi); |
6954 | gsi_next (&gsi)) | |
6955 | { | |
6956 | gimple phi = gsi_stmt (gsi); | |
c58936b6 | 6957 | |
5c245b95 RG |
6958 | if (is_gimple_reg (gimple_phi_result (phi))) |
6959 | find_func_aliases (phi); | |
6960 | } | |
3e5937d7 | 6961 | |
5c245b95 RG |
6962 | for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi)) |
6963 | { | |
6964 | gimple stmt = gsi_stmt (gsi); | |
3e5937d7 | 6965 | |
5c245b95 | 6966 | find_func_aliases (stmt); |
25a6a873 | 6967 | find_func_clobbers (stmt); |
5c245b95 RG |
6968 | } |
6969 | } | |
c58936b6 | 6970 | |
5c245b95 RG |
6971 | current_function_decl = old_func_decl; |
6972 | pop_cfun (); | |
25a6a873 RG |
6973 | |
6974 | if (dump_file) | |
6975 | { | |
6976 | fprintf (dump_file, "\n"); | |
6977 | dump_constraints (dump_file, from); | |
6978 | fprintf (dump_file, "\n"); | |
6979 | } | |
6980 | from = VEC_length (constraint_t, constraints); | |
5c245b95 | 6981 | } |
c58936b6 | 6982 | |
5c245b95 RG |
6983 | /* From the constraints compute the points-to sets. */ |
6984 | solve_constraints (); | |
c58936b6 | 6985 | |
25a6a873 RG |
6986 | /* Compute the global points-to sets for ESCAPED. |
6987 | ??? Note that the computed escape set is not correct | |
6988 | for the whole unit as we fail to consider graph edges to | |
6989 | externally visible functions. */ | |
6990 | find_what_var_points_to (get_varinfo (escaped_id), &ipa_escaped_pt); | |
6991 | ||
6992 | /* Make sure the ESCAPED solution (which is used as placeholder in | |
6993 | other solutions) does not reference itself. This simplifies | |
6994 | points-to solution queries. */ | |
6995 | ipa_escaped_pt.ipa_escaped = 0; | |
6996 | ||
6997 | /* Assign the points-to sets to the SSA names in the unit. */ | |
65c70e6b | 6998 | FOR_EACH_DEFINED_FUNCTION (node) |
25a6a873 RG |
6999 | { |
7000 | tree ptr; | |
7001 | struct function *fn; | |
7002 | unsigned i; | |
7003 | varinfo_t fi; | |
7004 | basic_block bb; | |
7005 | struct pt_solution uses, clobbers; | |
7006 | struct cgraph_edge *e; | |
7007 | ||
7008 | /* Nodes without a body are not interesting. */ | |
1565af08 | 7009 | if (!cgraph_function_with_gimple_body_p (node)) |
25a6a873 RG |
7010 | continue; |
7011 | ||
960bfb69 | 7012 | fn = DECL_STRUCT_FUNCTION (node->symbol.decl); |
25a6a873 RG |
7013 | |
7014 | /* Compute the points-to sets for pointer SSA_NAMEs. */ | |
ac47786e | 7015 | FOR_EACH_VEC_ELT (tree, fn->gimple_df->ssa_names, i, ptr) |
25a6a873 RG |
7016 | { |
7017 | if (ptr | |
7018 | && POINTER_TYPE_P (TREE_TYPE (ptr))) | |
7019 | find_what_p_points_to (ptr); | |
7020 | } | |
7021 | ||
7022 | /* Compute the call-use and call-clobber sets for all direct calls. */ | |
960bfb69 | 7023 | fi = lookup_vi_for_tree (node->symbol.decl); |
25a6a873 RG |
7024 | gcc_assert (fi->is_fn_info); |
7025 | find_what_var_points_to (first_vi_for_offset (fi, fi_clobbers), | |
7026 | &clobbers); | |
7027 | find_what_var_points_to (first_vi_for_offset (fi, fi_uses), &uses); | |
7028 | for (e = node->callers; e; e = e->next_caller) | |
7029 | { | |
7030 | if (!e->call_stmt) | |
7031 | continue; | |
7032 | ||
7033 | *gimple_call_clobber_set (e->call_stmt) = clobbers; | |
7034 | *gimple_call_use_set (e->call_stmt) = uses; | |
7035 | } | |
7036 | ||
7037 | /* Compute the call-use and call-clobber sets for indirect calls | |
7038 | and calls to external functions. */ | |
7039 | FOR_EACH_BB_FN (bb, fn) | |
7040 | { | |
7041 | gimple_stmt_iterator gsi; | |
7042 | ||
7043 | for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi)) | |
7044 | { | |
7045 | gimple stmt = gsi_stmt (gsi); | |
7046 | struct pt_solution *pt; | |
7047 | varinfo_t vi; | |
7048 | tree decl; | |
7049 | ||
7050 | if (!is_gimple_call (stmt)) | |
7051 | continue; | |
7052 | ||
7053 | /* Handle direct calls to external functions. */ | |
7054 | decl = gimple_call_fndecl (stmt); | |
7055 | if (decl | |
7056 | && (!(fi = lookup_vi_for_tree (decl)) | |
7057 | || !fi->is_fn_info)) | |
7058 | { | |
7059 | pt = gimple_call_use_set (stmt); | |
7060 | if (gimple_call_flags (stmt) & ECF_CONST) | |
7061 | memset (pt, 0, sizeof (struct pt_solution)); | |
7062 | else if ((vi = lookup_call_use_vi (stmt)) != NULL) | |
7063 | { | |
7064 | find_what_var_points_to (vi, pt); | |
7065 | /* Escaped (and thus nonlocal) variables are always | |
7066 | implicitly used by calls. */ | |
7067 | /* ??? ESCAPED can be empty even though NONLOCAL | |
7068 | always escaped. */ | |
7069 | pt->nonlocal = 1; | |
7070 | pt->ipa_escaped = 1; | |
7071 | } | |
7072 | else | |
7073 | { | |
7074 | /* If there is nothing special about this call then | |
7075 | we have made everything that is used also escape. */ | |
7076 | *pt = ipa_escaped_pt; | |
7077 | pt->nonlocal = 1; | |
7078 | } | |
7079 | ||
7080 | pt = gimple_call_clobber_set (stmt); | |
7081 | if (gimple_call_flags (stmt) & (ECF_CONST|ECF_PURE|ECF_NOVOPS)) | |
7082 | memset (pt, 0, sizeof (struct pt_solution)); | |
7083 | else if ((vi = lookup_call_clobber_vi (stmt)) != NULL) | |
7084 | { | |
7085 | find_what_var_points_to (vi, pt); | |
7086 | /* Escaped (and thus nonlocal) variables are always | |
7087 | implicitly clobbered by calls. */ | |
7088 | /* ??? ESCAPED can be empty even though NONLOCAL | |
7089 | always escaped. */ | |
7090 | pt->nonlocal = 1; | |
7091 | pt->ipa_escaped = 1; | |
7092 | } | |
7093 | else | |
7094 | { | |
7095 | /* If there is nothing special about this call then | |
7096 | we have made everything that is used also escape. */ | |
7097 | *pt = ipa_escaped_pt; | |
7098 | pt->nonlocal = 1; | |
7099 | } | |
7100 | } | |
7101 | ||
7102 | /* Handle indirect calls. */ | |
7103 | if (!decl | |
7104 | && (fi = get_fi_for_callee (stmt))) | |
7105 | { | |
7106 | /* We need to accumulate all clobbers/uses of all possible | |
7107 | callees. */ | |
7108 | fi = get_varinfo (find (fi->id)); | |
7109 | /* If we cannot constrain the set of functions we'll end up | |
7110 | calling we end up using/clobbering everything. */ | |
7111 | if (bitmap_bit_p (fi->solution, anything_id) | |
7112 | || bitmap_bit_p (fi->solution, nonlocal_id) | |
7113 | || bitmap_bit_p (fi->solution, escaped_id)) | |
7114 | { | |
7115 | pt_solution_reset (gimple_call_clobber_set (stmt)); | |
7116 | pt_solution_reset (gimple_call_use_set (stmt)); | |
7117 | } | |
7118 | else | |
7119 | { | |
7120 | bitmap_iterator bi; | |
7121 | unsigned i; | |
7122 | struct pt_solution *uses, *clobbers; | |
7123 | ||
7124 | uses = gimple_call_use_set (stmt); | |
7125 | clobbers = gimple_call_clobber_set (stmt); | |
7126 | memset (uses, 0, sizeof (struct pt_solution)); | |
7127 | memset (clobbers, 0, sizeof (struct pt_solution)); | |
7128 | EXECUTE_IF_SET_IN_BITMAP (fi->solution, 0, i, bi) | |
7129 | { | |
7130 | struct pt_solution sol; | |
7131 | ||
7132 | vi = get_varinfo (i); | |
7133 | if (!vi->is_fn_info) | |
7134 | { | |
7135 | /* ??? We could be more precise here? */ | |
7136 | uses->nonlocal = 1; | |
7137 | uses->ipa_escaped = 1; | |
7138 | clobbers->nonlocal = 1; | |
7139 | clobbers->ipa_escaped = 1; | |
7140 | continue; | |
7141 | } | |
7142 | ||
7143 | if (!uses->anything) | |
7144 | { | |
7145 | find_what_var_points_to | |
7146 | (first_vi_for_offset (vi, fi_uses), &sol); | |
7147 | pt_solution_ior_into (uses, &sol); | |
7148 | } | |
7149 | if (!clobbers->anything) | |
7150 | { | |
7151 | find_what_var_points_to | |
7152 | (first_vi_for_offset (vi, fi_clobbers), &sol); | |
7153 | pt_solution_ior_into (clobbers, &sol); | |
7154 | } | |
7155 | } | |
7156 | } | |
7157 | } | |
7158 | } | |
7159 | } | |
7160 | ||
7161 | fn->gimple_df->ipa_pta = true; | |
7162 | } | |
7163 | ||
5c245b95 | 7164 | delete_points_to_sets (); |
c58936b6 | 7165 | |
4ee00913 | 7166 | in_ipa_mode = 0; |
5c245b95 | 7167 | |
c2924966 | 7168 | return 0; |
4ee00913 | 7169 | } |
c58936b6 | 7170 | |
8ddbbcae | 7171 | struct simple_ipa_opt_pass pass_ipa_pta = |
4ee00913 | 7172 | { |
8ddbbcae JH |
7173 | { |
7174 | SIMPLE_IPA_PASS, | |
4ee00913 DB |
7175 | "pta", /* name */ |
7176 | gate_ipa_pta, /* gate */ | |
7177 | ipa_pta_execute, /* execute */ | |
7178 | NULL, /* sub */ | |
7179 | NULL, /* next */ | |
7180 | 0, /* static_pass_number */ | |
7181 | TV_IPA_PTA, /* tv_id */ | |
7182 | 0, /* properties_required */ | |
7183 | 0, /* properties_provided */ | |
7184 | 0, /* properties_destroyed */ | |
7185 | 0, /* todo_flags_start */ | |
8ddbbcae JH |
7186 | TODO_update_ssa /* todo_flags_finish */ |
7187 | } | |
4ee00913 | 7188 | }; |