1 /* Analysis of polymorphic call context.
2 Copyright (C) 2013-2014 Free Software Foundation, Inc.
3 Contributed by Jan Hubicka
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 3, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
23 #include "coretypes.h"
26 #include "print-tree.h"
29 #include "tree-pass.h"
32 #include "hash-table.h"
34 #include "tree-pretty-print.h"
36 #include "basic-block.h"
39 #include "plugin-api.h"
43 #include "hard-reg-set.h"
48 #include "ipa-utils.h"
49 #include "tree-ssa-alias.h"
50 #include "internal-fn.h"
51 #include "gimple-fold.h"
52 #include "gimple-expr.h"
54 #include "alloc-pool.h"
56 #include "ipa-inline.h"
57 #include "diagnostic.h"
61 #include "gimple-pretty-print.h"
62 #include "stor-layout.h"
64 #include "data-streamer.h"
65 #include "lto-streamer.h"
66 #include "streamer-hooks.h"
68 /* Return true when TYPE contains an polymorphic type and thus is interesting
69 for devirtualization machinery. */
71 static bool contains_type_p (tree
, HOST_WIDE_INT
, tree
,
72 bool consider_placement_new
= true,
73 bool consider_bases
= true);
76 contains_polymorphic_type_p (const_tree type
)
78 type
= TYPE_MAIN_VARIANT (type
);
80 if (RECORD_OR_UNION_TYPE_P (type
))
83 && polymorphic_type_binfo_p (TYPE_BINFO (type
)))
85 for (tree fld
= TYPE_FIELDS (type
); fld
; fld
= DECL_CHAIN (fld
))
86 if (TREE_CODE (fld
) == FIELD_DECL
87 && !DECL_ARTIFICIAL (fld
)
88 && contains_polymorphic_type_p (TREE_TYPE (fld
)))
92 if (TREE_CODE (type
) == ARRAY_TYPE
)
93 return contains_polymorphic_type_p (TREE_TYPE (type
));
97 /* Return true if it seems valid to use placement new to build EXPECTED_TYPE
98 at possition CUR_OFFSET within TYPE.
100 POD can be changed to an instance of a polymorphic type by
101 placement new. Here we play safe and assume that any
102 non-polymorphic type is POD. */
104 possible_placement_new (tree type
, tree expected_type
,
105 HOST_WIDE_INT cur_offset
)
107 return ((TREE_CODE (type
) != RECORD_TYPE
108 || !TYPE_BINFO (type
)
109 || cur_offset
>= POINTER_SIZE
110 || !polymorphic_type_binfo_p (TYPE_BINFO (type
)))
111 && (!TYPE_SIZE (type
)
112 || !tree_fits_shwi_p (TYPE_SIZE (type
))
114 + (expected_type
? tree_to_uhwi (TYPE_SIZE (expected_type
))
116 <= tree_to_uhwi (TYPE_SIZE (type
)))));
119 /* THIS->OUTER_TYPE is a type of memory object where object of OTR_TYPE
120 is contained at THIS->OFFSET. Walk the memory representation of
121 THIS->OUTER_TYPE and find the outermost class type that match
122 OTR_TYPE or contain OTR_TYPE as a base. Update THIS
125 If OTR_TYPE is NULL, just find outermost polymorphic type with
126 virtual table present at possition OFFSET.
128 For example when THIS represents type
134 and we look for type at offset sizeof(int), we end up with B and offset 0.
135 If the same is produced by multiple inheritance, we end up with A and offset
138 If we can not find corresponding class, give up by setting
139 THIS->OUTER_TYPE to OTR_TYPE and THIS->OFFSET to NULL.
140 Return true when lookup was sucesful.
142 When CONSIDER_PLACEMENT_NEW is false, reject contexts that may be made
143 valid only via alocation of new polymorphic type inside by means
146 When CONSIDER_BASES is false, only look for actual fields, not base types
150 ipa_polymorphic_call_context::restrict_to_inner_class (tree otr_type
,
151 bool consider_placement_new
,
154 tree type
= outer_type
;
155 HOST_WIDE_INT cur_offset
= offset
;
156 bool speculative
= false;
157 bool size_unknown
= false;
158 unsigned HOST_WIDE_INT otr_type_size
= POINTER_SIZE
;
160 /* Update OUTER_TYPE to match EXPECTED_TYPE if it is not set. */
163 clear_outer_type (otr_type
);
167 /* See if OFFSET points inside OUTER_TYPE. If it does not, we know
168 that the context is either invalid, or the instance type must be
169 derived from OUTER_TYPE.
171 Because the instance type may contain field whose type is of OUTER_TYPE,
172 we can not derive any effective information about it.
174 TODO: In the case we know all derrived types, we can definitely do better
176 else if (TYPE_SIZE (outer_type
)
177 && tree_fits_shwi_p (TYPE_SIZE (outer_type
))
178 && tree_to_shwi (TYPE_SIZE (outer_type
)) >= 0
179 && tree_to_shwi (TYPE_SIZE (outer_type
)) <= offset
)
181 clear_outer_type (otr_type
);
185 /* If derived type is not allowed, we know that the context is invalid.
186 For dynamic types, we really do not have information about
187 size of the memory location. It is possible that completely
188 different type is stored after outer_type. */
189 if (!maybe_derived_type
&& !dynamic
)
191 clear_speculation ();
197 if (otr_type
&& TYPE_SIZE (otr_type
)
198 && tree_fits_shwi_p (TYPE_SIZE (otr_type
)))
199 otr_type_size
= tree_to_uhwi (TYPE_SIZE (otr_type
));
201 if (!type
|| offset
< 0)
202 goto no_useful_type_info
;
204 /* Find the sub-object the constant actually refers to and mark whether it is
205 an artificial one (as opposed to a user-defined one).
207 This loop is performed twice; first time for outer_type and second time
208 for speculative_outer_type. The second run has SPECULATIVE set. */
211 unsigned HOST_WIDE_INT pos
, size
;
214 /* If we do not know size of TYPE, we need to be more conservative
215 about accepting cases where we can not find EXPECTED_TYPE.
216 Generally the types that do matter here are of constant size.
217 Size_unknown case should be very rare. */
219 && tree_fits_shwi_p (TYPE_SIZE (type
))
220 && tree_to_shwi (TYPE_SIZE (type
)) >= 0)
221 size_unknown
= false;
225 /* On a match, just return what we found. */
227 && types_odr_comparable (type
, otr_type
)
228 && types_same_for_odr (type
, otr_type
))
230 && TREE_CODE (type
) == RECORD_TYPE
232 && polymorphic_type_binfo_p (TYPE_BINFO (type
))))
236 /* If we did not match the offset, just give up on speculation. */
238 /* Also check if speculation did not end up being same as
240 || (types_must_be_same_for_odr (speculative_outer_type
,
242 && (maybe_derived_type
243 == speculative_maybe_derived_type
)))
244 clear_speculation ();
249 /* If type is known to be final, do not worry about derived
250 types. Testing it here may help us to avoid speculation. */
251 if (otr_type
&& TREE_CODE (outer_type
) == RECORD_TYPE
252 && (!in_lto_p
|| odr_type_p (outer_type
))
253 && type_known_to_have_no_deriavations_p (outer_type
))
254 maybe_derived_type
= false;
256 /* Type can not contain itself on an non-zero offset. In that case
257 just give up. Still accept the case where size is now known.
258 Either the second copy may appear past the end of type or within
259 the non-POD buffer located inside the variably sized type
262 goto no_useful_type_info
;
263 /* If we determined type precisely or we have no clue on
264 speuclation, we are done. */
265 if (!maybe_derived_type
|| !speculative_outer_type
266 || !speculation_consistent_p (speculative_outer_type
,
268 speculative_maybe_derived_type
,
271 clear_speculation ();
274 /* Otherwise look into speculation now. */
278 type
= speculative_outer_type
;
279 cur_offset
= speculative_offset
;
285 /* Walk fields and find corresponding on at OFFSET. */
286 if (TREE_CODE (type
) == RECORD_TYPE
)
288 for (fld
= TYPE_FIELDS (type
); fld
; fld
= DECL_CHAIN (fld
))
290 if (TREE_CODE (fld
) != FIELD_DECL
)
293 pos
= int_bit_position (fld
);
294 if (pos
> (unsigned HOST_WIDE_INT
)cur_offset
)
297 /* Do not consider vptr itself. Not even for placement new. */
298 if (!pos
&& DECL_ARTIFICIAL (fld
)
299 && POINTER_TYPE_P (TREE_TYPE (fld
))
301 && polymorphic_type_binfo_p (TYPE_BINFO (type
)))
304 if (!DECL_SIZE (fld
) || !tree_fits_uhwi_p (DECL_SIZE (fld
)))
305 goto no_useful_type_info
;
306 size
= tree_to_uhwi (DECL_SIZE (fld
));
308 /* We can always skip types smaller than pointer size:
309 those can not contain a virtual table pointer.
311 Disqualifying fields that are too small to fit OTR_TYPE
312 saves work needed to walk them for no benefit.
313 Because of the way the bases are packed into a class, the
314 field's size may be smaller than type size, so it needs
315 to be done with a care. */
317 if (pos
<= (unsigned HOST_WIDE_INT
)cur_offset
318 && (pos
+ size
) >= (unsigned HOST_WIDE_INT
)cur_offset
321 || !TYPE_SIZE (TREE_TYPE (fld
))
322 || !tree_fits_shwi_p (TYPE_SIZE (TREE_TYPE (fld
)))
323 || (pos
+ tree_to_uhwi (TYPE_SIZE (TREE_TYPE (fld
))))
324 >= cur_offset
+ otr_type_size
))
329 goto no_useful_type_info
;
331 type
= TYPE_MAIN_VARIANT (TREE_TYPE (fld
));
333 /* DECL_ARTIFICIAL represents a basetype. */
334 if (!DECL_ARTIFICIAL (fld
))
340 /* As soon as we se an field containing the type,
341 we know we are not looking for derivations. */
342 maybe_derived_type
= false;
346 speculative_outer_type
= type
;
347 speculative_offset
= cur_offset
;
348 speculative_maybe_derived_type
= false;
351 else if (!consider_bases
)
352 goto no_useful_type_info
;
354 else if (TREE_CODE (type
) == ARRAY_TYPE
)
356 tree subtype
= TYPE_MAIN_VARIANT (TREE_TYPE (type
));
358 /* Give up if we don't know array field size.
359 Also give up on non-polymorphic types as they are used
360 as buffers for placement new. */
361 if (!TYPE_SIZE (subtype
)
362 || !tree_fits_shwi_p (TYPE_SIZE (subtype
))
363 || tree_to_shwi (TYPE_SIZE (subtype
)) <= 0
364 || !contains_polymorphic_type_p (subtype
))
365 goto no_useful_type_info
;
367 HOST_WIDE_INT new_offset
= cur_offset
% tree_to_shwi (TYPE_SIZE (subtype
));
369 /* We may see buffer for placement new. In this case the expected type
370 can be bigger than the subtype. */
371 if (TYPE_SIZE (subtype
)
372 && (cur_offset
+ otr_type_size
373 > tree_to_uhwi (TYPE_SIZE (subtype
))))
374 goto no_useful_type_info
;
376 cur_offset
= new_offset
;
382 maybe_derived_type
= false;
386 speculative_outer_type
= type
;
387 speculative_offset
= cur_offset
;
388 speculative_maybe_derived_type
= false;
391 /* Give up on anything else. */
395 if (maybe_derived_type
&& !speculative
396 && TREE_CODE (outer_type
) == RECORD_TYPE
397 && TREE_CODE (otr_type
) == RECORD_TYPE
398 && TYPE_BINFO (otr_type
)
400 && get_binfo_at_offset (TYPE_BINFO (otr_type
), 0, outer_type
))
402 clear_outer_type (otr_type
);
403 if (!speculative_outer_type
404 || !speculation_consistent_p (speculative_outer_type
,
406 speculative_maybe_derived_type
,
408 clear_speculation ();
409 if (speculative_outer_type
)
412 type
= speculative_outer_type
;
413 cur_offset
= speculative_offset
;
418 /* We found no way to embedd EXPECTED_TYPE in TYPE.
419 We still permit two special cases - placement new and
420 the case of variadic types containing themselves. */
422 && consider_placement_new
423 && (size_unknown
|| !type
|| maybe_derived_type
424 || possible_placement_new (type
, otr_type
, cur_offset
)))
426 /* In these weird cases we want to accept the context.
427 In non-speculative run we have no useful outer_type info
428 (TODO: we may eventually want to record upper bound on the
429 type size that can be used to prune the walk),
430 but we still want to consider speculation that may
434 clear_outer_type (otr_type
);
435 if (!speculative_outer_type
436 || !speculation_consistent_p (speculative_outer_type
,
438 speculative_maybe_derived_type
,
440 clear_speculation ();
441 if (speculative_outer_type
)
444 type
= speculative_outer_type
;
445 cur_offset
= speculative_offset
;
451 clear_speculation ();
456 clear_speculation ();
459 clear_outer_type (otr_type
);
467 /* Return true if OUTER_TYPE contains OTR_TYPE at OFFSET.
468 CONSIDER_PLACEMENT_NEW makes function to accept cases where OTR_TYPE can
469 be built within OUTER_TYPE by means of placement new. CONSIDER_BASES makes
470 function to accept cases where OTR_TYPE appears as base of OUTER_TYPE or as
471 base of one of fields of OUTER_TYPE. */
474 contains_type_p (tree outer_type
, HOST_WIDE_INT offset
,
476 bool consider_placement_new
,
479 ipa_polymorphic_call_context context
;
481 /* Check that type is within range. */
484 if (TYPE_SIZE (outer_type
) && TYPE_SIZE (otr_type
)
485 && TREE_CODE (outer_type
) == INTEGER_CST
486 && TREE_CODE (otr_type
) == INTEGER_CST
487 && wi::ltu_p (wi::to_offset (outer_type
), (wi::to_offset (otr_type
) + offset
)))
490 context
.offset
= offset
;
491 context
.outer_type
= TYPE_MAIN_VARIANT (outer_type
);
492 context
.maybe_derived_type
= false;
493 return context
.restrict_to_inner_class (otr_type
, consider_placement_new
, consider_bases
);
497 /* We know that the instance is stored in variable or parameter
498 (not dynamically allocated) and we want to disprove the fact
499 that it may be in construction at invocation of CALL.
501 BASE represents memory location where instance is stored.
502 If BASE is NULL, it is assumed to be global memory.
503 OUTER_TYPE is known type of the instance or NULL if not
506 For the variable to be in construction we actually need to
507 be in constructor of corresponding global variable or
508 the inline stack of CALL must contain the constructor.
509 Check this condition. This check works safely only before
510 IPA passes, because inline stacks may become out of date
514 decl_maybe_in_construction_p (tree base
, tree outer_type
,
515 gimple call
, tree function
)
518 outer_type
= TYPE_MAIN_VARIANT (outer_type
);
519 gcc_assert (!base
|| DECL_P (base
));
521 /* After inlining the code unification optimizations may invalidate
522 inline stacks. Also we need to give up on global variables after
523 IPA, because addresses of these may have been propagated to their
525 if (DECL_STRUCT_FUNCTION (function
)->after_inlining
)
528 /* Pure functions can not do any changes on the dynamic type;
529 that require writting to memory. */
530 if ((!base
|| !auto_var_in_fn_p (base
, function
))
531 && flags_from_decl_or_type (function
) & (ECF_PURE
| ECF_CONST
))
534 for (tree block
= gimple_block (call
); block
&& TREE_CODE (block
) == BLOCK
;
535 block
= BLOCK_SUPERCONTEXT (block
))
536 if (BLOCK_ABSTRACT_ORIGIN (block
)
537 && TREE_CODE (BLOCK_ABSTRACT_ORIGIN (block
)) == FUNCTION_DECL
)
539 tree fn
= BLOCK_ABSTRACT_ORIGIN (block
);
541 if (TREE_CODE (TREE_TYPE (fn
)) != METHOD_TYPE
542 || (!DECL_CXX_CONSTRUCTOR_P (fn
)
543 && !DECL_CXX_DESTRUCTOR_P (fn
)))
545 /* Watch for clones where we constant propagated the first
546 argument (pointer to the instance). */
547 fn
= DECL_ABSTRACT_ORIGIN (fn
);
549 || (base
&& !is_global_var (base
))
550 || TREE_CODE (TREE_TYPE (fn
)) != METHOD_TYPE
551 || (!DECL_CXX_CONSTRUCTOR_P (fn
)
552 && !DECL_CXX_DESTRUCTOR_P (fn
)))
555 if (flags_from_decl_or_type (fn
) & (ECF_PURE
| ECF_CONST
))
558 tree type
= TYPE_MAIN_VARIANT (method_class_type (TREE_TYPE (fn
)));
560 if (!outer_type
|| !types_odr_comparable (type
, outer_type
))
562 if (TREE_CODE (type
) == RECORD_TYPE
564 && polymorphic_type_binfo_p (TYPE_BINFO (type
)))
567 else if (types_same_for_odr (type
, outer_type
))
571 if (!base
|| (TREE_CODE (base
) == VAR_DECL
&& is_global_var (base
)))
573 if (TREE_CODE (TREE_TYPE (function
)) != METHOD_TYPE
574 || (!DECL_CXX_CONSTRUCTOR_P (function
)
575 && !DECL_CXX_DESTRUCTOR_P (function
)))
577 if (!DECL_ABSTRACT_ORIGIN (function
))
579 /* Watch for clones where we constant propagated the first
580 argument (pointer to the instance). */
581 function
= DECL_ABSTRACT_ORIGIN (function
);
583 || TREE_CODE (TREE_TYPE (function
)) != METHOD_TYPE
584 || (!DECL_CXX_CONSTRUCTOR_P (function
)
585 && !DECL_CXX_DESTRUCTOR_P (function
)))
588 tree type
= TYPE_MAIN_VARIANT (method_class_type (TREE_TYPE (function
)));
589 if (!outer_type
|| !types_odr_comparable (type
, outer_type
))
591 if (TREE_CODE (type
) == RECORD_TYPE
593 && polymorphic_type_binfo_p (TYPE_BINFO (type
)))
596 else if (types_same_for_odr (type
, outer_type
))
602 /* Dump human readable context to F. If NEWLINE is true, it will be terminated
606 ipa_polymorphic_call_context::dump (FILE *f
, bool newline
) const
610 fprintf (f
, "Call is known to be undefined");
614 fprintf (f
, "nothing known");
615 if (outer_type
|| offset
)
617 fprintf (f
, "Outer type%s:", dynamic
? " (dynamic)":"");
618 print_generic_expr (f
, outer_type
, TDF_SLIM
);
619 if (maybe_derived_type
)
620 fprintf (f
, " (or a derived type)");
621 if (maybe_in_construction
)
622 fprintf (f
, " (maybe in construction)");
623 fprintf (f
, " offset "HOST_WIDE_INT_PRINT_DEC
,
626 if (speculative_outer_type
)
628 if (outer_type
|| offset
)
630 fprintf (f
, "Speculative outer type:");
631 print_generic_expr (f
, speculative_outer_type
, TDF_SLIM
);
632 if (speculative_maybe_derived_type
)
633 fprintf (f
, " (or a derived type)");
634 fprintf (f
, " at offset "HOST_WIDE_INT_PRINT_DEC
,
642 /* Print context to stderr. */
645 ipa_polymorphic_call_context::debug () const
650 /* Stream out the context to OB. */
653 ipa_polymorphic_call_context::stream_out (struct output_block
*ob
) const
655 struct bitpack_d bp
= bitpack_create (ob
->main_stream
);
657 bp_pack_value (&bp
, invalid
, 1);
658 bp_pack_value (&bp
, maybe_in_construction
, 1);
659 bp_pack_value (&bp
, maybe_derived_type
, 1);
660 bp_pack_value (&bp
, speculative_maybe_derived_type
, 1);
661 bp_pack_value (&bp
, dynamic
, 1);
662 bp_pack_value (&bp
, outer_type
!= NULL
, 1);
663 bp_pack_value (&bp
, offset
!= 0, 1);
664 bp_pack_value (&bp
, speculative_outer_type
!= NULL
, 1);
665 streamer_write_bitpack (&bp
);
667 if (outer_type
!= NULL
)
668 stream_write_tree (ob
, outer_type
, true);
670 streamer_write_hwi (ob
, offset
);
671 if (speculative_outer_type
!= NULL
)
673 stream_write_tree (ob
, speculative_outer_type
, true);
674 streamer_write_hwi (ob
, speculative_offset
);
677 gcc_assert (!speculative_offset
);
680 /* Stream in the context from IB and DATA_IN. */
683 ipa_polymorphic_call_context::stream_in (struct lto_input_block
*ib
,
684 struct data_in
*data_in
)
686 struct bitpack_d bp
= streamer_read_bitpack (ib
);
688 invalid
= bp_unpack_value (&bp
, 1);
689 maybe_in_construction
= bp_unpack_value (&bp
, 1);
690 maybe_derived_type
= bp_unpack_value (&bp
, 1);
691 speculative_maybe_derived_type
= bp_unpack_value (&bp
, 1);
692 dynamic
= bp_unpack_value (&bp
, 1);
693 bool outer_type_p
= bp_unpack_value (&bp
, 1);
694 bool offset_p
= bp_unpack_value (&bp
, 1);
695 bool speculative_outer_type_p
= bp_unpack_value (&bp
, 1);
698 outer_type
= stream_read_tree (ib
, data_in
);
702 offset
= (HOST_WIDE_INT
) streamer_read_hwi (ib
);
705 if (speculative_outer_type_p
)
707 speculative_outer_type
= stream_read_tree (ib
, data_in
);
708 speculative_offset
= (HOST_WIDE_INT
) streamer_read_hwi (ib
);
712 speculative_outer_type
= NULL
;
713 speculative_offset
= 0;
717 /* Proudce polymorphic call context for call method of instance
718 that is located within BASE (that is assumed to be a decl) at offset OFF. */
721 ipa_polymorphic_call_context::set_by_decl (tree base
, HOST_WIDE_INT off
)
723 gcc_assert (DECL_P (base
));
724 clear_speculation ();
726 if (!contains_polymorphic_type_p (TREE_TYPE (base
)))
732 outer_type
= TYPE_MAIN_VARIANT (TREE_TYPE (base
));
734 /* Make very conservative assumption that all objects
735 may be in construction.
737 It is up to caller to revisit this via
738 get_dynamic_type or decl_maybe_in_construction_p. */
739 maybe_in_construction
= true;
740 maybe_derived_type
= false;
744 /* CST is an invariant (address of decl), try to get meaningful
745 polymorphic call context for polymorphic call of method
746 if instance of OTR_TYPE that is located at offset OFF of this invariant.
747 Return FALSE if nothing meaningful can be found. */
750 ipa_polymorphic_call_context::set_by_invariant (tree cst
,
754 HOST_WIDE_INT offset2
, size
, max_size
;
759 clear_outer_type (otr_type
);
761 if (TREE_CODE (cst
) != ADDR_EXPR
)
764 cst
= TREE_OPERAND (cst
, 0);
765 base
= get_ref_base_and_extent (cst
, &offset2
, &size
, &max_size
);
766 if (!DECL_P (base
) || max_size
== -1 || max_size
!= size
)
769 /* Only type inconsistent programs can have otr_type that is
770 not part of outer type. */
771 if (otr_type
&& !contains_type_p (TREE_TYPE (base
), off
, otr_type
))
774 set_by_decl (base
, off
);
778 /* See if OP is SSA name initialized as a copy or by single assignment.
779 If so, walk the SSA graph up. Because simple PHI conditional is considered
780 copy, GLOBAL_VISITED may be used to avoid infinite loop walking the SSA
784 walk_ssa_copies (tree op
, hash_set
<tree
> **global_visited
= NULL
)
786 hash_set
<tree
> *visited
= NULL
;
788 while (TREE_CODE (op
) == SSA_NAME
789 && !SSA_NAME_IS_DEFAULT_DEF (op
)
790 && SSA_NAME_DEF_STMT (op
)
791 && (gimple_assign_single_p (SSA_NAME_DEF_STMT (op
))
792 || gimple_code (SSA_NAME_DEF_STMT (op
)) == GIMPLE_PHI
))
796 if (!*global_visited
)
797 *global_visited
= new hash_set
<tree
>;
798 if ((*global_visited
)->add (op
))
804 visited
= new hash_set
<tree
>;
805 if (visited
->add (op
))
813 This pattern is implicitly produced for casts to non-primary
814 bases. When doing context analysis, we do not really care
815 about the case pointer is NULL, becuase the call will be
817 if (gimple_code (SSA_NAME_DEF_STMT (op
)) == GIMPLE_PHI
)
819 gimple phi
= SSA_NAME_DEF_STMT (op
);
821 if (gimple_phi_num_args (phi
) > 2)
823 if (gimple_phi_num_args (phi
) == 1)
824 op
= gimple_phi_arg_def (phi
, 0);
825 else if (integer_zerop (gimple_phi_arg_def (phi
, 0)))
826 op
= gimple_phi_arg_def (phi
, 1);
827 else if (integer_zerop (gimple_phi_arg_def (phi
, 1)))
828 op
= gimple_phi_arg_def (phi
, 0);
834 if (gimple_assign_load_p (SSA_NAME_DEF_STMT (op
)))
836 op
= gimple_assign_rhs1 (SSA_NAME_DEF_STMT (op
));
846 /* Create polymorphic call context from IP invariant CST.
847 This is typically &global_var.
848 OTR_TYPE specify type of polymorphic call or NULL if unknown, OFF
849 is offset of call. */
851 ipa_polymorphic_call_context::ipa_polymorphic_call_context (tree cst
,
855 clear_speculation ();
856 set_by_invariant (cst
, otr_type
, off
);
859 /* Build context for pointer REF contained in FNDECL at statement STMT.
860 if INSTANCE is non-NULL, return pointer to the object described by
861 the context or DECL where context is contained in. */
863 ipa_polymorphic_call_context::ipa_polymorphic_call_context (tree fndecl
,
868 tree otr_type
= NULL
;
870 hash_set
<tree
> *visited
= NULL
;
872 if (TREE_CODE (ref
) == OBJ_TYPE_REF
)
874 otr_type
= obj_type_ref_class (ref
);
875 base_pointer
= OBJ_TYPE_REF_OBJECT (ref
);
880 /* Set up basic info in case we find nothing interesting in the analysis. */
881 clear_speculation ();
882 clear_outer_type (otr_type
);
885 /* Walk SSA for outer object. */
888 base_pointer
= walk_ssa_copies (base_pointer
, &visited
);
889 if (TREE_CODE (base_pointer
) == ADDR_EXPR
)
891 HOST_WIDE_INT size
, max_size
;
892 HOST_WIDE_INT offset2
;
893 tree base
= get_ref_base_and_extent (TREE_OPERAND (base_pointer
, 0),
894 &offset2
, &size
, &max_size
);
896 if (max_size
!= -1 && max_size
== size
)
897 combine_speculation_with (TYPE_MAIN_VARIANT (TREE_TYPE (base
)),
900 NULL
/* Do not change outer type. */);
902 /* If this is a varying address, punt. */
903 if ((TREE_CODE (base
) == MEM_REF
|| DECL_P (base
))
907 /* We found dereference of a pointer. Type of the pointer
908 and MEM_REF is meaningless, but we can look futher. */
909 if (TREE_CODE (base
) == MEM_REF
)
911 base_pointer
= TREE_OPERAND (base
, 0);
913 += offset2
+ mem_ref_offset (base
).to_short_addr () * BITS_PER_UNIT
;
916 /* We found base object. In this case the outer_type
918 else if (DECL_P (base
))
922 /* Only type inconsistent programs can have otr_type that is
923 not part of outer type. */
925 && !contains_type_p (TREE_TYPE (base
),
926 offset
+ offset2
, otr_type
))
930 *instance
= base_pointer
;
933 set_by_decl (base
, offset
+ offset2
);
934 if (outer_type
&& maybe_in_construction
&& stmt
)
935 maybe_in_construction
936 = decl_maybe_in_construction_p (base
,
950 else if (TREE_CODE (base_pointer
) == POINTER_PLUS_EXPR
951 && tree_fits_uhwi_p (TREE_OPERAND (base_pointer
, 1)))
953 offset
+= tree_to_shwi (TREE_OPERAND (base_pointer
, 1))
955 base_pointer
= TREE_OPERAND (base_pointer
, 0);
964 /* Try to determine type of the outer object. */
965 if (TREE_CODE (base_pointer
) == SSA_NAME
966 && SSA_NAME_IS_DEFAULT_DEF (base_pointer
)
967 && TREE_CODE (SSA_NAME_VAR (base_pointer
)) == PARM_DECL
)
969 /* See if parameter is THIS pointer of a method. */
970 if (TREE_CODE (TREE_TYPE (fndecl
)) == METHOD_TYPE
971 && SSA_NAME_VAR (base_pointer
) == DECL_ARGUMENTS (fndecl
))
974 = TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (base_pointer
)));
975 gcc_assert (TREE_CODE (outer_type
) == RECORD_TYPE
976 || TREE_CODE (outer_type
) == UNION_TYPE
);
978 /* Dynamic casting has possibly upcasted the type
979 in the hiearchy. In this case outer type is less
980 informative than inner type and we should forget
983 && !contains_type_p (outer_type
, offset
,
985 || !contains_polymorphic_type_p (outer_type
))
989 *instance
= base_pointer
;
995 /* If the function is constructor or destructor, then
996 the type is possibly in construction, but we know
997 it is not derived type. */
998 if (DECL_CXX_CONSTRUCTOR_P (fndecl
)
999 || DECL_CXX_DESTRUCTOR_P (fndecl
))
1001 maybe_in_construction
= true;
1002 maybe_derived_type
= false;
1006 maybe_derived_type
= true;
1007 maybe_in_construction
= false;
1010 *instance
= base_pointer
;
1013 /* Non-PODs passed by value are really passed by invisible
1014 reference. In this case we also know the type of the
1016 if (DECL_BY_REFERENCE (SSA_NAME_VAR (base_pointer
)))
1019 = TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (base_pointer
)));
1020 /* Only type inconsistent programs can have otr_type that is
1021 not part of outer type. */
1022 if (otr_type
&& !contains_type_p (outer_type
, offset
,
1027 *instance
= base_pointer
;
1030 /* Non-polymorphic types have no interest for us. */
1031 else if (!otr_type
&& !contains_polymorphic_type_p (outer_type
))
1035 *instance
= base_pointer
;
1038 maybe_derived_type
= false;
1039 maybe_in_construction
= false;
1041 *instance
= base_pointer
;
1046 tree base_type
= TREE_TYPE (base_pointer
);
1048 if (TREE_CODE (base_pointer
) == SSA_NAME
1049 && SSA_NAME_IS_DEFAULT_DEF (base_pointer
)
1050 && !(TREE_CODE (SSA_NAME_VAR (base_pointer
)) == PARM_DECL
1051 || TREE_CODE (SSA_NAME_VAR (base_pointer
)) == RESULT_DECL
))
1055 *instance
= base_pointer
;
1058 if (TREE_CODE (base_pointer
) == SSA_NAME
1059 && SSA_NAME_DEF_STMT (base_pointer
)
1060 && gimple_assign_single_p (SSA_NAME_DEF_STMT (base_pointer
)))
1061 base_type
= TREE_TYPE (gimple_assign_rhs1
1062 (SSA_NAME_DEF_STMT (base_pointer
)));
1064 if (POINTER_TYPE_P (base_type
))
1065 combine_speculation_with (TYPE_MAIN_VARIANT (TREE_TYPE (base_type
)),
1067 true, NULL
/* Do not change type here */);
1068 /* TODO: There are multiple ways to derive a type. For instance
1069 if BASE_POINTER is passed to an constructor call prior our refernece.
1070 We do not make this type of flow sensitive analysis yet. */
1072 *instance
= base_pointer
;
1076 /* Structure to be passed in between detect_type_change and
1077 check_stmt_for_type_change. */
1079 struct type_change_info
1081 /* Offset into the object where there is the virtual method pointer we are
1083 HOST_WIDE_INT offset
;
1084 /* The declaration or SSA_NAME pointer of the base that we are checking for
1087 /* The reference to virtual table pointer used. */
1090 /* If we actually can tell the type that the object has changed to, it is
1091 stored in this field. Otherwise it remains NULL_TREE. */
1092 tree known_current_type
;
1093 HOST_WIDE_INT known_current_offset
;
1095 /* Set to true if dynamic type change has been detected. */
1096 bool type_maybe_changed
;
1097 /* Set to true if multiple types have been encountered. known_current_type
1098 must be disregarded in that case. */
1099 bool multiple_types_encountered
;
1100 /* Set to true if we possibly missed some dynamic type changes and we should
1101 consider the set to be speculative. */
1103 bool seen_unanalyzed_store
;
1106 /* Return true if STMT is not call and can modify a virtual method table pointer.
1107 We take advantage of fact that vtable stores must appear within constructor
1108 and destructor functions. */
1111 noncall_stmt_may_be_vtbl_ptr_store (gimple stmt
)
1113 if (is_gimple_assign (stmt
))
1115 tree lhs
= gimple_assign_lhs (stmt
);
1117 if (gimple_clobber_p (stmt
))
1119 if (!AGGREGATE_TYPE_P (TREE_TYPE (lhs
)))
1121 if (flag_strict_aliasing
1122 && !POINTER_TYPE_P (TREE_TYPE (lhs
)))
1125 if (TREE_CODE (lhs
) == COMPONENT_REF
1126 && !DECL_VIRTUAL_P (TREE_OPERAND (lhs
, 1)))
1128 /* In the future we might want to use get_base_ref_and_offset to find
1129 if there is a field corresponding to the offset and if so, proceed
1130 almost like if it was a component ref. */
1134 /* Code unification may mess with inline stacks. */
1135 if (cfun
->after_inlining
)
1138 /* Walk the inline stack and watch out for ctors/dtors.
1139 TODO: Maybe we can require the store to appear in toplevel
1140 block of CTOR/DTOR. */
1141 for (tree block
= gimple_block (stmt
); block
&& TREE_CODE (block
) == BLOCK
;
1142 block
= BLOCK_SUPERCONTEXT (block
))
1143 if (BLOCK_ABSTRACT_ORIGIN (block
)
1144 && TREE_CODE (BLOCK_ABSTRACT_ORIGIN (block
)) == FUNCTION_DECL
)
1146 tree fn
= BLOCK_ABSTRACT_ORIGIN (block
);
1148 if (flags_from_decl_or_type (fn
) & (ECF_PURE
| ECF_CONST
))
1150 return (TREE_CODE (TREE_TYPE (fn
)) == METHOD_TYPE
1151 && (DECL_CXX_CONSTRUCTOR_P (fn
)
1152 || DECL_CXX_DESTRUCTOR_P (fn
)));
1154 return (TREE_CODE (TREE_TYPE (current_function_decl
)) == METHOD_TYPE
1155 && (DECL_CXX_CONSTRUCTOR_P (current_function_decl
)
1156 || DECL_CXX_DESTRUCTOR_P (current_function_decl
)));
1159 /* If STMT can be proved to be an assignment to the virtual method table
1160 pointer of ANALYZED_OBJ and the type associated with the new table
1161 identified, return the type. Otherwise return NULL_TREE if type changes
1162 in unknown way or ERROR_MARK_NODE if type is unchanged. */
1165 extr_type_from_vtbl_ptr_store (gimple stmt
, struct type_change_info
*tci
,
1166 HOST_WIDE_INT
*type_offset
)
1168 HOST_WIDE_INT offset
, size
, max_size
;
1169 tree lhs
, rhs
, base
;
1171 if (!gimple_assign_single_p (stmt
))
1174 lhs
= gimple_assign_lhs (stmt
);
1175 rhs
= gimple_assign_rhs1 (stmt
);
1176 if (TREE_CODE (lhs
) != COMPONENT_REF
1177 || !DECL_VIRTUAL_P (TREE_OPERAND (lhs
, 1)))
1180 fprintf (dump_file
, " LHS is not virtual table.\n");
1184 if (tci
->vtbl_ptr_ref
&& operand_equal_p (lhs
, tci
->vtbl_ptr_ref
, 0))
1188 base
= get_ref_base_and_extent (lhs
, &offset
, &size
, &max_size
);
1189 if (DECL_P (tci
->instance
))
1191 if (base
!= tci
->instance
)
1195 fprintf (dump_file
, " base:");
1196 print_generic_expr (dump_file
, base
, TDF_SLIM
);
1197 fprintf (dump_file
, " does not match instance:");
1198 print_generic_expr (dump_file
, tci
->instance
, TDF_SLIM
);
1199 fprintf (dump_file
, "\n");
1204 else if (TREE_CODE (base
) == MEM_REF
)
1206 if (!operand_equal_p (tci
->instance
, TREE_OPERAND (base
, 0), 0))
1210 fprintf (dump_file
, " base mem ref:");
1211 print_generic_expr (dump_file
, base
, TDF_SLIM
);
1212 fprintf (dump_file
, " does not match instance:");
1213 print_generic_expr (dump_file
, tci
->instance
, TDF_SLIM
);
1214 fprintf (dump_file
, "\n");
1218 if (!integer_zerop (TREE_OPERAND (base
, 1)))
1220 if (!tree_fits_shwi_p (TREE_OPERAND (base
, 1)))
1224 fprintf (dump_file
, " base mem ref:");
1225 print_generic_expr (dump_file
, base
, TDF_SLIM
);
1226 fprintf (dump_file
, " has non-representable offset:");
1227 print_generic_expr (dump_file
, tci
->instance
, TDF_SLIM
);
1228 fprintf (dump_file
, "\n");
1233 offset
+= tree_to_shwi (TREE_OPERAND (base
, 1)) * BITS_PER_UNIT
;
1236 else if (!operand_equal_p (tci
->instance
, base
, 0)
1241 fprintf (dump_file
, " base:");
1242 print_generic_expr (dump_file
, base
, TDF_SLIM
);
1243 fprintf (dump_file
, " does not match instance:");
1244 print_generic_expr (dump_file
, tci
->instance
, TDF_SLIM
);
1245 fprintf (dump_file
, " with offset %i\n", (int)tci
->offset
);
1247 return tci
->offset
> POINTER_SIZE
? error_mark_node
: NULL_TREE
;
1249 if (offset
!= tci
->offset
1250 || size
!= POINTER_SIZE
1251 || max_size
!= POINTER_SIZE
)
1254 fprintf (dump_file
, " wrong offset %i!=%i or size %i\n",
1255 (int)offset
, (int)tci
->offset
, (int)size
);
1256 return offset
+ POINTER_SIZE
<= tci
->offset
1258 && tci
->offset
+ POINTER_SIZE
> offset
+ max_size
)
1259 ? error_mark_node
: NULL
;
1264 unsigned HOST_WIDE_INT offset2
;
1266 if (!vtable_pointer_value_to_vtable (rhs
, &vtable
, &offset2
))
1269 fprintf (dump_file
, " Failed to lookup binfo\n");
1273 tree binfo
= subbinfo_with_vtable_at_offset (TYPE_BINFO (DECL_CONTEXT (vtable
)),
1278 fprintf (dump_file
, " Construction vtable used\n");
1279 /* FIXME: We should suport construction contexts. */
1283 *type_offset
= tree_to_shwi (BINFO_OFFSET (binfo
)) * BITS_PER_UNIT
;
1284 return DECL_CONTEXT (vtable
);
1287 /* Record dynamic type change of TCI to TYPE. */
1290 record_known_type (struct type_change_info
*tci
, tree type
, HOST_WIDE_INT offset
)
1296 fprintf (dump_file
, " Recording type: ");
1297 print_generic_expr (dump_file
, type
, TDF_SLIM
);
1298 fprintf (dump_file
, " at offset %i\n", (int)offset
);
1301 fprintf (dump_file
, " Recording unknown type\n");
1304 /* If we found a constructor of type that is not polymorphic or
1305 that may contain the type in question as a field (not as base),
1306 restrict to the inner class first to make type matching bellow
1310 || (TREE_CODE (type
) != RECORD_TYPE
1311 || !TYPE_BINFO (type
)
1312 || !polymorphic_type_binfo_p (TYPE_BINFO (type
)))))
1314 ipa_polymorphic_call_context context
;
1316 context
.offset
= offset
;
1317 context
.outer_type
= type
;
1318 context
.maybe_in_construction
= false;
1319 context
.maybe_derived_type
= false;
1320 context
.dynamic
= true;
1321 /* If we failed to find the inner type, we know that the call
1322 would be undefined for type produced here. */
1323 if (!context
.restrict_to_inner_class (tci
->otr_type
))
1326 fprintf (dump_file
, " Ignoring; does not contain otr_type\n");
1329 /* Watch for case we reached an POD type and anticipate placement
1331 if (!context
.maybe_derived_type
)
1333 type
= context
.outer_type
;
1334 offset
= context
.offset
;
1337 if (tci
->type_maybe_changed
1338 && (!types_same_for_odr (type
, tci
->known_current_type
)
1339 || offset
!= tci
->known_current_offset
))
1340 tci
->multiple_types_encountered
= true;
1341 tci
->known_current_type
= TYPE_MAIN_VARIANT (type
);
1342 tci
->known_current_offset
= offset
;
1343 tci
->type_maybe_changed
= true;
1346 /* Callback of walk_aliased_vdefs and a helper function for
1347 detect_type_change to check whether a particular statement may modify
1348 the virtual table pointer, and if possible also determine the new type of
1349 the (sub-)object. It stores its result into DATA, which points to a
1350 type_change_info structure. */
1353 check_stmt_for_type_change (ao_ref
*ao ATTRIBUTE_UNUSED
, tree vdef
, void *data
)
1355 gimple stmt
= SSA_NAME_DEF_STMT (vdef
);
1356 struct type_change_info
*tci
= (struct type_change_info
*) data
;
1359 /* If we already gave up, just terminate the rest of walk. */
1360 if (tci
->multiple_types_encountered
)
1363 if (is_gimple_call (stmt
))
1365 if (gimple_call_flags (stmt
) & (ECF_CONST
| ECF_PURE
))
1368 /* Check for a constructor call. */
1369 if ((fn
= gimple_call_fndecl (stmt
)) != NULL_TREE
1370 && DECL_CXX_CONSTRUCTOR_P (fn
)
1371 && TREE_CODE (TREE_TYPE (fn
)) == METHOD_TYPE
1372 && gimple_call_num_args (stmt
))
1374 tree op
= walk_ssa_copies (gimple_call_arg (stmt
, 0));
1375 tree type
= method_class_type (TREE_TYPE (fn
));
1376 HOST_WIDE_INT offset
= 0, size
, max_size
;
1380 fprintf (dump_file
, " Checking constructor call: ");
1381 print_gimple_stmt (dump_file
, stmt
, 0, 0);
1384 /* See if THIS parameter seems like instance pointer. */
1385 if (TREE_CODE (op
) == ADDR_EXPR
)
1387 op
= get_ref_base_and_extent (TREE_OPERAND (op
, 0),
1388 &offset
, &size
, &max_size
);
1389 if (size
!= max_size
|| max_size
== -1)
1391 tci
->speculative
= true;
1394 if (op
&& TREE_CODE (op
) == MEM_REF
)
1396 if (!tree_fits_shwi_p (TREE_OPERAND (op
, 1)))
1398 tci
->speculative
= true;
1401 offset
+= tree_to_shwi (TREE_OPERAND (op
, 1))
1403 op
= TREE_OPERAND (op
, 0);
1405 else if (DECL_P (op
))
1409 tci
->speculative
= true;
1412 op
= walk_ssa_copies (op
);
1414 if (operand_equal_p (op
, tci
->instance
, 0)
1416 && TREE_CODE (TYPE_SIZE (type
)) == INTEGER_CST
1417 && tree_fits_shwi_p (TYPE_SIZE (type
))
1418 && tree_to_shwi (TYPE_SIZE (type
)) + offset
> tci
->offset
)
1420 record_known_type (tci
, type
, tci
->offset
- offset
);
1424 /* Calls may possibly change dynamic type by placement new. Assume
1425 it will not happen, but make result speculative only. */
1428 fprintf (dump_file
, " Function call may change dynamic type:");
1429 print_gimple_stmt (dump_file
, stmt
, 0, 0);
1431 tci
->speculative
= true;
1434 /* Check for inlined virtual table store. */
1435 else if (noncall_stmt_may_be_vtbl_ptr_store (stmt
))
1438 HOST_WIDE_INT offset
= 0;
1441 fprintf (dump_file
, " Checking vtbl store: ");
1442 print_gimple_stmt (dump_file
, stmt
, 0, 0);
1445 type
= extr_type_from_vtbl_ptr_store (stmt
, tci
, &offset
);
1446 if (type
== error_mark_node
)
1448 gcc_assert (!type
|| TYPE_MAIN_VARIANT (type
) == type
);
1452 fprintf (dump_file
, " Unanalyzed store may change type.\n");
1453 tci
->seen_unanalyzed_store
= true;
1454 tci
->speculative
= true;
1457 record_known_type (tci
, type
, offset
);
1464 /* THIS is polymorphic call context obtained from get_polymorphic_context.
1465 OTR_OBJECT is pointer to the instance returned by OBJ_TYPE_REF_OBJECT.
1466 INSTANCE is pointer to the outer instance as returned by
1467 get_polymorphic_context. To avoid creation of temporary expressions,
1468 INSTANCE may also be an declaration of get_polymorphic_context found the
1469 value to be in static storage.
1471 If the type of instance is not fully determined
1472 (either OUTER_TYPE is unknown or MAYBE_IN_CONSTRUCTION/INCLUDE_DERIVED_TYPES
1473 is set), try to walk memory writes and find the actual construction of the
1476 Return true if memory is unchanged from function entry.
1478 We do not include this analysis in the context analysis itself, because
1479 it needs memory SSA to be fully built and the walk may be expensive.
1480 So it is not suitable for use withing fold_stmt and similar uses. */
1483 ipa_polymorphic_call_context::get_dynamic_type (tree instance
,
1488 struct type_change_info tci
;
1490 bool function_entry_reached
= false;
1491 tree instance_ref
= NULL
;
1493 /* Remember OFFSET before it is modified by restrict_to_inner_class.
1494 This is because we do not update INSTANCE when walking inwards. */
1495 HOST_WIDE_INT instance_offset
= offset
;
1498 otr_type
= TYPE_MAIN_VARIANT (otr_type
);
1500 /* Walk into inner type. This may clear maybe_derived_type and save us
1501 from useless work. It also makes later comparsions with static type
1503 if (outer_type
&& otr_type
)
1505 if (!restrict_to_inner_class (otr_type
))
1509 if (!maybe_in_construction
&& !maybe_derived_type
)
1512 /* We need to obtain refernce to virtual table pointer. It is better
1513 to look it up in the code rather than build our own. This require bit
1514 of pattern matching, but we end up verifying that what we found is
1517 What we pattern match is:
1519 tmp = instance->_vptr.A; // vtbl ptr load
1520 tmp2 = tmp[otr_token]; // vtable lookup
1521 OBJ_TYPE_REF(tmp2;instance->0) (instance);
1523 We want to start alias oracle walk from vtbl pointer load,
1524 but we may not be able to identify it, for example, when PRE moved the
1527 if (gimple_code (call
) == GIMPLE_CALL
)
1529 tree ref
= gimple_call_fn (call
);
1530 HOST_WIDE_INT offset2
, size
, max_size
;
1532 if (TREE_CODE (ref
) == OBJ_TYPE_REF
)
1534 ref
= OBJ_TYPE_REF_EXPR (ref
);
1535 ref
= walk_ssa_copies (ref
);
1537 /* Check if definition looks like vtable lookup. */
1538 if (TREE_CODE (ref
) == SSA_NAME
1539 && !SSA_NAME_IS_DEFAULT_DEF (ref
)
1540 && gimple_assign_load_p (SSA_NAME_DEF_STMT (ref
))
1541 && TREE_CODE (gimple_assign_rhs1
1542 (SSA_NAME_DEF_STMT (ref
))) == MEM_REF
)
1544 ref
= get_base_address
1545 (TREE_OPERAND (gimple_assign_rhs1
1546 (SSA_NAME_DEF_STMT (ref
)), 0));
1547 ref
= walk_ssa_copies (ref
);
1548 /* Find base address of the lookup and see if it looks like
1550 if (TREE_CODE (ref
) == SSA_NAME
1551 && !SSA_NAME_IS_DEFAULT_DEF (ref
)
1552 && gimple_assign_load_p (SSA_NAME_DEF_STMT (ref
)))
1554 tree ref_exp
= gimple_assign_rhs1 (SSA_NAME_DEF_STMT (ref
));
1555 tree base_ref
= get_ref_base_and_extent
1556 (ref_exp
, &offset2
, &size
, &max_size
);
1558 /* Finally verify that what we found looks like read from OTR_OBJECT
1559 or from INSTANCE with offset OFFSET. */
1561 && ((TREE_CODE (base_ref
) == MEM_REF
1562 && ((offset2
== instance_offset
1563 && TREE_OPERAND (base_ref
, 0) == instance
)
1564 || (!offset2
&& TREE_OPERAND (base_ref
, 0) == otr_object
)))
1565 || (DECL_P (instance
) && base_ref
== instance
1566 && offset2
== instance_offset
)))
1568 stmt
= SSA_NAME_DEF_STMT (ref
);
1569 instance_ref
= ref_exp
;
1576 /* If we failed to look up the refernece in code, build our own. */
1579 /* If the statement in question does not use memory, we can't tell
1581 if (!gimple_vuse (stmt
))
1583 ao_ref_init_from_ptr_and_size (&ao
, otr_object
, NULL
);
1586 /* Otherwise use the real reference. */
1587 ao_ref_init (&ao
, instance_ref
);
1589 /* We look for vtbl pointer read. */
1590 ao
.size
= POINTER_SIZE
;
1591 ao
.max_size
= ao
.size
;
1594 = get_deref_alias_set (TREE_TYPE (BINFO_VTABLE (TYPE_BINFO (otr_type
))));
1598 fprintf (dump_file
, "Determining dynamic type for call: ");
1599 print_gimple_stmt (dump_file
, call
, 0, 0);
1600 fprintf (dump_file
, " Starting walk at: ");
1601 print_gimple_stmt (dump_file
, stmt
, 0, 0);
1602 fprintf (dump_file
, " instance pointer: ");
1603 print_generic_expr (dump_file
, otr_object
, TDF_SLIM
);
1604 fprintf (dump_file
, " Outer instance pointer: ");
1605 print_generic_expr (dump_file
, instance
, TDF_SLIM
);
1606 fprintf (dump_file
, " offset: %i (bits)", (int)offset
);
1607 fprintf (dump_file
, " vtbl reference: ");
1608 print_generic_expr (dump_file
, instance_ref
, TDF_SLIM
);
1609 fprintf (dump_file
, "\n");
1612 tci
.offset
= offset
;
1613 tci
.instance
= instance
;
1614 tci
.vtbl_ptr_ref
= instance_ref
;
1615 gcc_assert (TREE_CODE (instance
) != MEM_REF
);
1616 tci
.known_current_type
= NULL_TREE
;
1617 tci
.known_current_offset
= 0;
1618 tci
.otr_type
= otr_type
;
1619 tci
.type_maybe_changed
= false;
1620 tci
.multiple_types_encountered
= false;
1621 tci
.speculative
= false;
1622 tci
.seen_unanalyzed_store
= false;
1624 walk_aliased_vdefs (&ao
, gimple_vuse (stmt
), check_stmt_for_type_change
,
1625 &tci
, NULL
, &function_entry_reached
);
1627 /* If we did not find any type changing statements, we may still drop
1628 maybe_in_construction flag if the context already have outer type.
1630 Here we make special assumptions about both constructors and
1631 destructors which are all the functions that are allowed to alter the
1632 VMT pointers. It assumes that destructors begin with assignment into
1633 all VMT pointers and that constructors essentially look in the
1636 1) The very first thing they do is that they call constructors of
1637 ancestor sub-objects that have them.
1639 2) Then VMT pointers of this and all its ancestors is set to new
1640 values corresponding to the type corresponding to the constructor.
1642 3) Only afterwards, other stuff such as constructor of member
1643 sub-objects and the code written by the user is run. Only this may
1644 include calling virtual functions, directly or indirectly.
1646 4) placement new can not be used to change type of non-POD statically
1647 allocated variables.
1649 There is no way to call a constructor of an ancestor sub-object in any
1652 This means that we do not have to care whether constructors get the
1653 correct type information because they will always change it (in fact,
1654 if we define the type to be given by the VMT pointer, it is undefined).
1656 The most important fact to derive from the above is that if, for some
1657 statement in the section 3, we try to detect whether the dynamic type
1658 has changed, we can safely ignore all calls as we examine the function
1659 body backwards until we reach statements in section 2 because these
1660 calls cannot be ancestor constructors or destructors (if the input is
1661 not bogus) and so do not change the dynamic type (this holds true only
1662 for automatically allocated objects but at the moment we devirtualize
1663 only these). We then must detect that statements in section 2 change
1664 the dynamic type and can try to derive the new type. That is enough
1665 and we can stop, we will never see the calls into constructors of
1666 sub-objects in this code.
1668 Therefore if the static outer type was found (outer_type)
1669 we can safely ignore tci.speculative that is set on calls and give up
1670 only if there was dyanmic type store that may affect given variable
1671 (seen_unanalyzed_store) */
1673 if (!tci
.type_maybe_changed
1676 && !tci
.seen_unanalyzed_store
1677 && !tci
.multiple_types_encountered
1678 && offset
== tci
.offset
1679 && types_same_for_odr (tci
.known_current_type
,
1682 if (!outer_type
|| tci
.seen_unanalyzed_store
)
1684 if (maybe_in_construction
)
1685 maybe_in_construction
= false;
1687 fprintf (dump_file
, " No dynamic type change found.\n");
1691 if (tci
.known_current_type
1692 && !function_entry_reached
1693 && !tci
.multiple_types_encountered
)
1695 if (!tci
.speculative
)
1697 outer_type
= TYPE_MAIN_VARIANT (tci
.known_current_type
);
1698 offset
= tci
.known_current_offset
;
1700 maybe_in_construction
= false;
1701 maybe_derived_type
= false;
1703 fprintf (dump_file
, " Determined dynamic type.\n");
1705 else if (!speculative_outer_type
1706 || speculative_maybe_derived_type
)
1708 speculative_outer_type
= TYPE_MAIN_VARIANT (tci
.known_current_type
);
1709 speculative_offset
= tci
.known_current_offset
;
1710 speculative_maybe_derived_type
= false;
1712 fprintf (dump_file
, " Determined speculative dynamic type.\n");
1717 fprintf (dump_file
, " Found multiple types%s%s\n",
1718 function_entry_reached
? " (function entry reached)" : "",
1719 function_entry_reached
? " (multiple types encountered)" : "");
1725 /* See if speculation given by SPEC_OUTER_TYPE, SPEC_OFFSET and SPEC_MAYBE_DERIVED_TYPE
1726 seems consistent (and useful) with what we already have in the non-speculative context. */
1729 ipa_polymorphic_call_context::speculation_consistent_p (tree spec_outer_type
,
1730 HOST_WIDE_INT spec_offset
,
1731 bool spec_maybe_derived_type
,
1732 tree otr_type
) const
1734 if (!flag_devirtualize_speculatively
)
1737 /* Non-polymorphic types are useless for deriving likely polymorphic
1739 if (!spec_outer_type
|| !contains_polymorphic_type_p (spec_outer_type
))
1742 /* If we know nothing, speculation is always good. */
1746 /* Speculation is only useful to avoid derived types.
1747 This is not 100% true for placement new, where the outer context may
1748 turn out to be useless, but ignore these for now. */
1749 if (!maybe_derived_type
)
1752 /* If types agrees, speculation is consistent, but it makes sense only
1753 when it says something new. */
1754 if (types_must_be_same_for_odr (spec_outer_type
, outer_type
))
1755 return maybe_derived_type
&& !spec_maybe_derived_type
;
1757 /* If speculation does not contain the type in question, ignore it. */
1759 && !contains_type_p (spec_outer_type
, spec_offset
, otr_type
, false, true))
1762 /* If outer type already contains speculation as a filed,
1763 it is useless. We already know from OUTER_TYPE
1764 SPEC_TYPE and that it is not in the construction. */
1765 if (contains_type_p (outer_type
, offset
- spec_offset
,
1766 spec_outer_type
, false, false))
1769 /* If speculative outer type is not more specified than outer
1771 We can only decide this safely if we can compare types with OUTER_TYPE.
1773 if ((!in_lto_p
|| odr_type_p (outer_type
))
1774 && !contains_type_p (spec_outer_type
,
1775 spec_offset
- offset
,
1781 /* Improve THIS with speculation described by NEW_OUTER_TYPE, NEW_OFFSET,
1782 NEW_MAYBE_DERIVED_TYPE
1783 If OTR_TYPE is set, assume the context is used with OTR_TYPE. */
1786 ipa_polymorphic_call_context::combine_speculation_with
1787 (tree new_outer_type
, HOST_WIDE_INT new_offset
, bool new_maybe_derived_type
,
1790 if (!new_outer_type
)
1793 /* restrict_to_inner_class may eliminate wrong speculation making our job
1796 restrict_to_inner_class (otr_type
);
1798 if (!speculation_consistent_p (new_outer_type
, new_offset
,
1799 new_maybe_derived_type
, otr_type
))
1802 /* New speculation is a win in case we have no speculation or new
1803 speculation does not consider derivations. */
1804 if (!speculative_outer_type
1805 || (speculative_maybe_derived_type
1806 && !new_maybe_derived_type
))
1808 speculative_outer_type
= new_outer_type
;
1809 speculative_offset
= new_offset
;
1810 speculative_maybe_derived_type
= new_maybe_derived_type
;
1813 else if (types_must_be_same_for_odr (speculative_outer_type
,
1816 if (speculative_offset
!= new_offset
)
1818 /* OK we have two contexts that seems valid but they disagree,
1821 This is not a lattice operation, so we may want to drop it later. */
1822 if (dump_file
&& (dump_flags
& TDF_DETAILS
))
1824 "Speculative outer types match, "
1825 "offset mismatch -> invalid speculation\n");
1826 clear_speculation ();
1831 if (speculative_maybe_derived_type
&& !new_maybe_derived_type
)
1833 speculative_maybe_derived_type
= false;
1840 /* Choose type that contains the other. This one either contains the outer
1841 as a field (thus giving exactly one target) or is deeper in the type
1843 else if (speculative_outer_type
1844 && speculative_maybe_derived_type
1845 && (new_offset
> speculative_offset
1846 || (new_offset
== speculative_offset
1847 && contains_type_p (new_outer_type
,
1848 0, speculative_outer_type
, false))))
1850 tree old_outer_type
= speculative_outer_type
;
1851 HOST_WIDE_INT old_offset
= speculative_offset
;
1852 bool old_maybe_derived_type
= speculative_maybe_derived_type
;
1854 speculative_outer_type
= new_outer_type
;
1855 speculative_offset
= new_offset
;
1856 speculative_maybe_derived_type
= new_maybe_derived_type
;
1859 restrict_to_inner_class (otr_type
);
1861 /* If the speculation turned out to make no sense, revert to sensible
1863 if (!speculative_outer_type
)
1865 speculative_outer_type
= old_outer_type
;
1866 speculative_offset
= old_offset
;
1867 speculative_maybe_derived_type
= old_maybe_derived_type
;
1870 return (old_offset
!= speculative_offset
1871 || old_maybe_derived_type
!= speculative_maybe_derived_type
1872 || types_must_be_same_for_odr (speculative_outer_type
,
1878 /* Make speculation less specific so
1879 NEW_OUTER_TYPE, NEW_OFFSET, NEW_MAYBE_DERIVED_TYPE is also included.
1880 If OTR_TYPE is set, assume the context is used with OTR_TYPE. */
1883 ipa_polymorphic_call_context::meet_speculation_with
1884 (tree new_outer_type
, HOST_WIDE_INT new_offset
, bool new_maybe_derived_type
,
1887 if (!new_outer_type
&& speculative_outer_type
)
1889 clear_speculation ();
1893 /* restrict_to_inner_class may eliminate wrong speculation making our job
1896 restrict_to_inner_class (otr_type
);
1898 if (!speculative_outer_type
1899 || !speculation_consistent_p (speculative_outer_type
,
1901 speculative_maybe_derived_type
,
1905 if (!speculation_consistent_p (new_outer_type
, new_offset
,
1906 new_maybe_derived_type
, otr_type
))
1908 clear_speculation ();
1912 else if (types_must_be_same_for_odr (speculative_outer_type
,
1915 if (speculative_offset
!= new_offset
)
1917 clear_speculation ();
1922 if (!speculative_maybe_derived_type
&& new_maybe_derived_type
)
1924 speculative_maybe_derived_type
= true;
1931 /* See if one type contains the other as a field (not base). */
1932 else if (contains_type_p (new_outer_type
, new_offset
- speculative_offset
,
1933 speculative_outer_type
, false, false))
1935 else if (contains_type_p (speculative_outer_type
,
1936 speculative_offset
- new_offset
,
1937 new_outer_type
, false, false))
1939 speculative_outer_type
= new_outer_type
;
1940 speculative_offset
= new_offset
;
1941 speculative_maybe_derived_type
= new_maybe_derived_type
;
1944 /* See if OUTER_TYPE is base of CTX.OUTER_TYPE. */
1945 else if (contains_type_p (new_outer_type
,
1946 new_offset
- speculative_offset
,
1947 speculative_outer_type
, false, true))
1949 if (!speculative_maybe_derived_type
)
1951 speculative_maybe_derived_type
= true;
1956 /* See if CTX.OUTER_TYPE is base of OUTER_TYPE. */
1957 else if (contains_type_p (speculative_outer_type
,
1958 speculative_offset
- new_offset
, new_outer_type
, false, true))
1960 speculative_outer_type
= new_outer_type
;
1961 speculative_offset
= new_offset
;
1962 speculative_maybe_derived_type
= true;
1967 if (dump_file
&& (dump_flags
& TDF_DETAILS
))
1968 fprintf (dump_file
, "Giving up on speculative meet\n");
1969 clear_speculation ();
1974 /* Assume that both THIS and a given context is valid and strenghten THIS
1975 if possible. Return true if any strenghtening was made.
1976 If actual type the context is being used in is known, OTR_TYPE should be
1977 set accordingly. This improves quality of combined result. */
1980 ipa_polymorphic_call_context::combine_with (ipa_polymorphic_call_context ctx
,
1983 bool updated
= false;
1985 if (ctx
.useless_p () || invalid
)
1988 /* Restricting context to inner type makes merging easier, however do not
1989 do that unless we know how the context is used (OTR_TYPE is non-NULL) */
1990 if (otr_type
&& !invalid
&& !ctx
.invalid
)
1992 restrict_to_inner_class (otr_type
);
1993 ctx
.restrict_to_inner_class (otr_type
);
1998 if (dump_file
&& (dump_flags
& TDF_DETAILS
))
2000 fprintf (dump_file
, "Polymorphic call context combine:");
2002 fprintf (dump_file
, "With context: ");
2003 ctx
.dump (dump_file
);
2006 fprintf (dump_file
, "To be used with type: ");
2007 print_generic_expr (dump_file
, otr_type
, TDF_SLIM
);
2008 fprintf (dump_file
, "\n");
2012 /* If call is known to be invalid, we are done. */
2015 if (dump_file
&& (dump_flags
& TDF_DETAILS
))
2016 fprintf (dump_file
, "-> Invalid context\n");
2020 if (!ctx
.outer_type
)
2022 else if (!outer_type
)
2024 outer_type
= ctx
.outer_type
;
2025 offset
= ctx
.offset
;
2026 dynamic
= ctx
.dynamic
;
2027 maybe_in_construction
= ctx
.maybe_in_construction
;
2028 maybe_derived_type
= ctx
.maybe_derived_type
;
2031 /* If types are known to be same, merging is quite easy. */
2032 else if (types_must_be_same_for_odr (outer_type
, ctx
.outer_type
))
2034 if (offset
!= ctx
.offset
2035 && TYPE_SIZE (outer_type
)
2036 && TREE_CODE (TYPE_SIZE (outer_type
)) == INTEGER_CST
)
2038 if (dump_file
&& (dump_flags
& TDF_DETAILS
))
2039 fprintf (dump_file
, "Outer types match, offset mismatch -> invalid\n");
2040 clear_speculation ();
2041 clear_outer_type ();
2045 if (dump_file
&& (dump_flags
& TDF_DETAILS
))
2046 fprintf (dump_file
, "Outer types match, merging flags\n");
2047 if (maybe_in_construction
&& !ctx
.maybe_in_construction
)
2050 maybe_in_construction
= false;
2052 if (maybe_derived_type
&& !ctx
.maybe_derived_type
)
2055 maybe_derived_type
= false;
2057 if (dynamic
&& !ctx
.dynamic
)
2063 /* If we know the type precisely, there is not much to improve. */
2064 else if (!maybe_derived_type
&& !maybe_in_construction
2065 && !ctx
.maybe_derived_type
&& !ctx
.maybe_in_construction
)
2067 /* It may be easy to check if second context permits the first
2068 and set INVALID otherwise. This is not easy to do in general;
2069 contains_type_p may return false negatives for non-comparable
2072 If OTR_TYPE is known, we however can expect that
2073 restrict_to_inner_class should have discovered the same base
2075 if (otr_type
&& !ctx
.maybe_in_construction
&& !ctx
.maybe_derived_type
)
2077 if (dump_file
&& (dump_flags
& TDF_DETAILS
))
2078 fprintf (dump_file
, "Contextes disagree -> invalid\n");
2082 /* See if one type contains the other as a field (not base).
2083 In this case we want to choose the wider type, because it contains
2084 more information. */
2085 else if (contains_type_p (ctx
.outer_type
, ctx
.offset
- offset
,
2086 outer_type
, false, false))
2088 if (dump_file
&& (dump_flags
& TDF_DETAILS
))
2089 fprintf (dump_file
, "Second type contain the first as a field\n");
2091 if (maybe_derived_type
)
2093 outer_type
= ctx
.outer_type
;
2094 maybe_derived_type
= ctx
.maybe_derived_type
;
2095 offset
= ctx
.offset
;
2096 dynamic
= ctx
.dynamic
;
2100 /* If we do not know how the context is being used, we can
2101 not clear MAYBE_IN_CONSTRUCTION because it may be offseted
2102 to other component of OUTER_TYPE later and we know nothing
2104 if (otr_type
&& maybe_in_construction
2105 && !ctx
.maybe_in_construction
)
2107 maybe_in_construction
= false;
2111 else if (contains_type_p (outer_type
, offset
- ctx
.offset
,
2112 ctx
.outer_type
, false, false))
2114 if (dump_file
&& (dump_flags
& TDF_DETAILS
))
2115 fprintf (dump_file
, "First type contain the second as a field\n");
2117 if (otr_type
&& maybe_in_construction
2118 && !ctx
.maybe_in_construction
)
2120 maybe_in_construction
= false;
2124 /* See if OUTER_TYPE is base of CTX.OUTER_TYPE. */
2125 else if (contains_type_p (ctx
.outer_type
,
2126 ctx
.offset
- offset
, outer_type
, false, true))
2128 if (dump_file
&& (dump_flags
& TDF_DETAILS
))
2129 fprintf (dump_file
, "First type is base of second\n");
2130 if (!maybe_derived_type
)
2132 if (!ctx
.maybe_in_construction
2133 && types_odr_comparable (outer_type
, ctx
.outer_type
))
2135 if (dump_file
&& (dump_flags
& TDF_DETAILS
))
2136 fprintf (dump_file
, "Second context does not permit base -> invalid\n");
2140 /* Pick variant deeper in the hiearchy. */
2143 outer_type
= ctx
.outer_type
;
2144 maybe_in_construction
= ctx
.maybe_in_construction
;
2145 maybe_derived_type
= ctx
.maybe_derived_type
;
2146 offset
= ctx
.offset
;
2147 dynamic
= ctx
.dynamic
;
2151 /* See if CTX.OUTER_TYPE is base of OUTER_TYPE. */
2152 else if (contains_type_p (outer_type
,
2153 offset
- ctx
.offset
, ctx
.outer_type
, false, true))
2155 if (dump_file
&& (dump_flags
& TDF_DETAILS
))
2156 fprintf (dump_file
, "Second type is base of first\n");
2157 if (!ctx
.maybe_derived_type
)
2159 if (!maybe_in_construction
2160 && types_odr_comparable (outer_type
, ctx
.outer_type
))
2162 if (dump_file
&& (dump_flags
& TDF_DETAILS
))
2163 fprintf (dump_file
, "First context does not permit base -> invalid\n");
2166 /* Pick the base type. */
2167 else if (maybe_in_construction
)
2169 outer_type
= ctx
.outer_type
;
2170 maybe_in_construction
= ctx
.maybe_in_construction
;
2171 maybe_derived_type
= ctx
.maybe_derived_type
;
2172 offset
= ctx
.offset
;
2173 dynamic
= ctx
.dynamic
;
2178 /* TODO handle merging using hiearchy. */
2179 else if (dump_file
&& (dump_flags
& TDF_DETAILS
))
2180 fprintf (dump_file
, "Giving up on merge\n");
2182 updated
|= combine_speculation_with (ctx
.speculative_outer_type
,
2183 ctx
.speculative_offset
,
2184 ctx
.speculative_maybe_derived_type
,
2187 if (updated
&& dump_file
&& (dump_flags
& TDF_DETAILS
))
2189 fprintf (dump_file
, "Updated as: ");
2191 fprintf (dump_file
, "\n");
2197 clear_speculation ();
2198 clear_outer_type ();
2202 /* Take non-speculative info, merge it with speculative and clear speculation.
2203 Used when we no longer manage to keep track of actual outer type, but we
2204 think it is still there.
2206 If OTR_TYPE is set, the transformation can be done more effectively assuming
2207 that context is going to be used only that way. */
2210 ipa_polymorphic_call_context::make_speculative (tree otr_type
)
2212 tree spec_outer_type
= outer_type
;
2213 HOST_WIDE_INT spec_offset
= offset
;
2214 bool spec_maybe_derived_type
= maybe_derived_type
;
2219 clear_outer_type ();
2220 clear_speculation ();
2225 clear_outer_type ();
2226 combine_speculation_with (spec_outer_type
, spec_offset
,
2227 spec_maybe_derived_type
,
2231 /* Use when we can not track dynamic type change. This speculatively assume
2232 type change is not happening. */
2235 ipa_polymorphic_call_context::possible_dynamic_type_change (bool in_poly_cdtor
,
2239 make_speculative (otr_type
);
2240 else if (in_poly_cdtor
)
2241 maybe_in_construction
= true;
2244 /* Return TRUE if this context conveys the same information as OTHER. */
2247 ipa_polymorphic_call_context::equal_to
2248 (const ipa_polymorphic_call_context
&x
) const
2251 return x
.useless_p ();
2254 if (x
.useless_p () || x
.invalid
)
2260 || !types_odr_comparable (outer_type
, x
.outer_type
)
2261 || !types_same_for_odr (outer_type
, x
.outer_type
)
2262 || offset
!= x
.offset
2263 || maybe_in_construction
!= x
.maybe_in_construction
2264 || maybe_derived_type
!= x
.maybe_derived_type
2265 || dynamic
!= x
.dynamic
)
2268 else if (x
.outer_type
)
2272 if (speculative_outer_type
2273 && speculation_consistent_p (speculative_outer_type
, speculative_offset
,
2274 speculative_maybe_derived_type
, NULL_TREE
))
2276 if (!x
.speculative_outer_type
)
2279 if (!types_odr_comparable (speculative_outer_type
,
2280 x
.speculative_outer_type
)
2281 || !types_same_for_odr (speculative_outer_type
,
2282 x
.speculative_outer_type
)
2283 || speculative_offset
!= x
.speculative_offset
2284 || speculative_maybe_derived_type
!= x
.speculative_maybe_derived_type
)
2287 else if (x
.speculative_outer_type
2288 && x
.speculation_consistent_p (x
.speculative_outer_type
,
2289 x
.speculative_offset
,
2290 x
.speculative_maybe_derived_type
,
2297 /* Modify context to be strictly less restrictive than CTX. */
2300 ipa_polymorphic_call_context::meet_with (ipa_polymorphic_call_context ctx
,
2303 bool updated
= false;
2305 if (useless_p () || ctx
.invalid
)
2308 /* Restricting context to inner type makes merging easier, however do not
2309 do that unless we know how the context is used (OTR_TYPE is non-NULL) */
2310 if (otr_type
&& !useless_p () && !ctx
.useless_p ())
2312 restrict_to_inner_class (otr_type
);
2313 ctx
.restrict_to_inner_class (otr_type
);
2321 if (ctx
.useless_p () || invalid
)
2327 if (dump_file
&& (dump_flags
& TDF_DETAILS
))
2329 fprintf (dump_file
, "Polymorphic call context meet:");
2331 fprintf (dump_file
, "With context: ");
2332 ctx
.dump (dump_file
);
2335 fprintf (dump_file
, "To be used with type: ");
2336 print_generic_expr (dump_file
, otr_type
, TDF_SLIM
);
2337 fprintf (dump_file
, "\n");
2341 if (!dynamic
&& ctx
.dynamic
)
2347 /* If call is known to be invalid, we are done. */
2350 else if (!ctx
.outer_type
)
2352 clear_outer_type ();
2355 /* If types are known to be same, merging is quite easy. */
2356 else if (types_must_be_same_for_odr (outer_type
, ctx
.outer_type
))
2358 if (offset
!= ctx
.offset
2359 && TYPE_SIZE (outer_type
)
2360 && TREE_CODE (TYPE_SIZE (outer_type
)) == INTEGER_CST
)
2362 if (dump_file
&& (dump_flags
& TDF_DETAILS
))
2363 fprintf (dump_file
, "Outer types match, offset mismatch -> clearing\n");
2364 clear_outer_type ();
2367 if (dump_file
&& (dump_flags
& TDF_DETAILS
))
2368 fprintf (dump_file
, "Outer types match, merging flags\n");
2369 if (!maybe_in_construction
&& ctx
.maybe_in_construction
)
2372 maybe_in_construction
= true;
2374 if (!maybe_derived_type
&& ctx
.maybe_derived_type
)
2377 maybe_derived_type
= true;
2379 if (!dynamic
&& ctx
.dynamic
)
2385 /* See if one type contains the other as a field (not base). */
2386 else if (contains_type_p (ctx
.outer_type
, ctx
.offset
- offset
,
2387 outer_type
, false, false))
2389 if (dump_file
&& (dump_flags
& TDF_DETAILS
))
2390 fprintf (dump_file
, "Second type contain the first as a field\n");
2392 /* The second type is more specified, so we keep the first.
2393 We need to set DYNAMIC flag to avoid declaring context INVALID
2394 of OFFSET ends up being out of range. */
2398 && (!TYPE_SIZE (ctx
.outer_type
)
2399 || !TYPE_SIZE (outer_type
)
2400 || !operand_equal_p (TYPE_SIZE (ctx
.outer_type
),
2401 TYPE_SIZE (outer_type
), 0)))))
2407 else if (contains_type_p (outer_type
, offset
- ctx
.offset
,
2408 ctx
.outer_type
, false, false))
2410 if (dump_file
&& (dump_flags
& TDF_DETAILS
))
2411 fprintf (dump_file
, "First type contain the second as a field\n");
2416 && (!TYPE_SIZE (ctx
.outer_type
)
2417 || !TYPE_SIZE (outer_type
)
2418 || !operand_equal_p (TYPE_SIZE (ctx
.outer_type
),
2419 TYPE_SIZE (outer_type
), 0)))))
2421 outer_type
= ctx
.outer_type
;
2422 offset
= ctx
.offset
;
2423 dynamic
= ctx
.dynamic
;
2424 maybe_in_construction
= ctx
.maybe_in_construction
;
2425 maybe_derived_type
= ctx
.maybe_derived_type
;
2428 /* See if OUTER_TYPE is base of CTX.OUTER_TYPE. */
2429 else if (contains_type_p (ctx
.outer_type
,
2430 ctx
.offset
- offset
, outer_type
, false, true))
2432 if (dump_file
&& (dump_flags
& TDF_DETAILS
))
2433 fprintf (dump_file
, "First type is base of second\n");
2434 if (!maybe_derived_type
)
2436 maybe_derived_type
= true;
2439 if (!maybe_in_construction
&& ctx
.maybe_in_construction
)
2441 maybe_in_construction
= true;
2444 if (!dynamic
&& ctx
.dynamic
)
2450 /* See if CTX.OUTER_TYPE is base of OUTER_TYPE. */
2451 else if (contains_type_p (outer_type
,
2452 offset
- ctx
.offset
, ctx
.outer_type
, false, true))
2454 if (dump_file
&& (dump_flags
& TDF_DETAILS
))
2455 fprintf (dump_file
, "Second type is base of first\n");
2456 outer_type
= ctx
.outer_type
;
2457 offset
= ctx
.offset
;
2459 if (!maybe_derived_type
)
2460 maybe_derived_type
= true;
2461 if (!maybe_in_construction
&& ctx
.maybe_in_construction
)
2462 maybe_in_construction
= true;
2463 if (!dynamic
&& ctx
.dynamic
)
2466 /* TODO handle merging using hiearchy. */
2469 if (dump_file
&& (dump_flags
& TDF_DETAILS
))
2470 fprintf (dump_file
, "Giving up on meet\n");
2471 clear_outer_type ();
2475 updated
|= meet_speculation_with (ctx
.speculative_outer_type
,
2476 ctx
.speculative_offset
,
2477 ctx
.speculative_maybe_derived_type
,
2480 if (updated
&& dump_file
&& (dump_flags
& TDF_DETAILS
))
2482 fprintf (dump_file
, "Updated as: ");
2484 fprintf (dump_file
, "\n");