forked from gbenson/binutils-gdb
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy patheval.c
3135 lines (2728 loc) · 93.3 KB
/
eval.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/* Evaluate expressions for GDB.
Copyright (C) 1986-2015 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "symtab.h"
#include "gdbtypes.h"
#include "value.h"
#include "expression.h"
#include "target.h"
#include "frame.h"
#include "gdbthread.h"
#include "language.h" /* For CAST_IS_CONVERSION. */
#include "f-lang.h" /* For array bound stuff. */
#include "cp-abi.h"
#include "infcall.h"
#include "objc-lang.h"
#include "block.h"
#include "parser-defs.h"
#include "cp-support.h"
#include "ui-out.h"
#include "regcache.h"
#include "user-regs.h"
#include "valprint.h"
#include "gdb_obstack.h"
#include "objfiles.h"
#include <ctype.h>
/* This is defined in valops.c */
extern int overload_resolution;
/* Prototypes for local functions. */
static struct value *evaluate_subexp_for_sizeof (struct expression *, int *,
enum noside);
static struct value *evaluate_subexp_for_address (struct expression *,
int *, enum noside);
static struct value *evaluate_struct_tuple (struct value *,
struct expression *, int *,
enum noside, int);
static LONGEST init_array_element (struct value *, struct value *,
struct expression *, int *, enum noside,
LONGEST, LONGEST);
struct value *
evaluate_subexp (struct type *expect_type, struct expression *exp,
int *pos, enum noside noside)
{
struct cleanup *cleanups;
struct value *retval;
int cleanup_temps = 0;
if (*pos == 0 && target_has_execution
&& exp->language_defn->la_language == language_cplus
&& !thread_stack_temporaries_enabled_p (inferior_ptid))
{
cleanups = enable_thread_stack_temporaries (inferior_ptid);
cleanup_temps = 1;
}
retval = (*exp->language_defn->la_exp_desc->evaluate_exp)
(expect_type, exp, pos, noside);
if (cleanup_temps)
{
if (value_in_thread_stack_temporaries (retval, inferior_ptid))
retval = value_non_lval (retval);
do_cleanups (cleanups);
}
return retval;
}
/* Parse the string EXP as a C expression, evaluate it,
and return the result as a number. */
CORE_ADDR
parse_and_eval_address (const char *exp)
{
struct expression *expr = parse_expression (exp);
CORE_ADDR addr;
struct cleanup *old_chain =
make_cleanup (free_current_contents, &expr);
addr = value_as_address (evaluate_expression (expr));
do_cleanups (old_chain);
return addr;
}
/* Like parse_and_eval_address, but treats the value of the expression
as an integer, not an address, returns a LONGEST, not a CORE_ADDR. */
LONGEST
parse_and_eval_long (const char *exp)
{
struct expression *expr = parse_expression (exp);
LONGEST retval;
struct cleanup *old_chain =
make_cleanup (free_current_contents, &expr);
retval = value_as_long (evaluate_expression (expr));
do_cleanups (old_chain);
return (retval);
}
struct value *
parse_and_eval (const char *exp)
{
struct expression *expr = parse_expression (exp);
struct value *val;
struct cleanup *old_chain =
make_cleanup (free_current_contents, &expr);
val = evaluate_expression (expr);
do_cleanups (old_chain);
return val;
}
/* Parse up to a comma (or to a closeparen)
in the string EXPP as an expression, evaluate it, and return the value.
EXPP is advanced to point to the comma. */
struct value *
parse_to_comma_and_eval (const char **expp)
{
struct expression *expr = parse_exp_1 (expp, 0, (struct block *) 0, 1);
struct value *val;
struct cleanup *old_chain =
make_cleanup (free_current_contents, &expr);
val = evaluate_expression (expr);
do_cleanups (old_chain);
return val;
}
/* Evaluate an expression in internal prefix form
such as is constructed by parse.y.
See expression.h for info on the format of an expression. */
struct value *
evaluate_expression (struct expression *exp)
{
int pc = 0;
return evaluate_subexp (NULL_TYPE, exp, &pc, EVAL_NORMAL);
}
/* Evaluate an expression, avoiding all memory references
and getting a value whose type alone is correct. */
struct value *
evaluate_type (struct expression *exp)
{
int pc = 0;
return evaluate_subexp (NULL_TYPE, exp, &pc, EVAL_AVOID_SIDE_EFFECTS);
}
/* Evaluate a subexpression, avoiding all memory references and
getting a value whose type alone is correct. */
struct value *
evaluate_subexpression_type (struct expression *exp, int subexp)
{
return evaluate_subexp (NULL_TYPE, exp, &subexp, EVAL_AVOID_SIDE_EFFECTS);
}
/* Find the current value of a watchpoint on EXP. Return the value in
*VALP and *RESULTP and the chain of intermediate and final values
in *VAL_CHAIN. RESULTP and VAL_CHAIN may be NULL if the caller does
not need them.
If PRESERVE_ERRORS is true, then exceptions are passed through.
Otherwise, if PRESERVE_ERRORS is false, then if a memory error
occurs while evaluating the expression, *RESULTP will be set to
NULL. *RESULTP may be a lazy value, if the result could not be
read from memory. It is used to determine whether a value is
user-specified (we should watch the whole value) or intermediate
(we should watch only the bit used to locate the final value).
If the final value, or any intermediate value, could not be read
from memory, *VALP will be set to NULL. *VAL_CHAIN will still be
set to any referenced values. *VALP will never be a lazy value.
This is the value which we store in struct breakpoint.
If VAL_CHAIN is non-NULL, *VAL_CHAIN will be released from the
value chain. The caller must free the values individually. If
VAL_CHAIN is NULL, all generated values will be left on the value
chain. */
void
fetch_subexp_value (struct expression *exp, int *pc, struct value **valp,
struct value **resultp, struct value **val_chain,
int preserve_errors)
{
struct value *mark, *new_mark, *result;
*valp = NULL;
if (resultp)
*resultp = NULL;
if (val_chain)
*val_chain = NULL;
/* Evaluate the expression. */
mark = value_mark ();
result = NULL;
TRY
{
result = evaluate_subexp (NULL_TYPE, exp, pc, EVAL_NORMAL);
}
CATCH (ex, RETURN_MASK_ALL)
{
/* Ignore memory errors if we want watchpoints pointing at
inaccessible memory to still be created; otherwise, throw the
error to some higher catcher. */
switch (ex.error)
{
case MEMORY_ERROR:
if (!preserve_errors)
break;
default:
throw_exception (ex);
break;
}
}
END_CATCH
new_mark = value_mark ();
if (mark == new_mark)
return;
if (resultp)
*resultp = result;
/* Make sure it's not lazy, so that after the target stops again we
have a non-lazy previous value to compare with. */
if (result != NULL)
{
if (!value_lazy (result))
*valp = result;
else
{
TRY
{
value_fetch_lazy (result);
*valp = result;
}
CATCH (except, RETURN_MASK_ERROR)
{
}
END_CATCH
}
}
if (val_chain)
{
/* Return the chain of intermediate values. We use this to
decide which addresses to watch. */
*val_chain = new_mark;
value_release_to_mark (mark);
}
}
/* Extract a field operation from an expression. If the subexpression
of EXP starting at *SUBEXP is not a structure dereference
operation, return NULL. Otherwise, return the name of the
dereferenced field, and advance *SUBEXP to point to the
subexpression of the left-hand-side of the dereference. This is
used when completing field names. */
char *
extract_field_op (struct expression *exp, int *subexp)
{
int tem;
char *result;
if (exp->elts[*subexp].opcode != STRUCTOP_STRUCT
&& exp->elts[*subexp].opcode != STRUCTOP_PTR)
return NULL;
tem = longest_to_int (exp->elts[*subexp + 1].longconst);
result = &exp->elts[*subexp + 2].string;
(*subexp) += 1 + 3 + BYTES_TO_EXP_ELEM (tem + 1);
return result;
}
/* This function evaluates brace-initializers (in C/C++) for
structure types. */
static struct value *
evaluate_struct_tuple (struct value *struct_val,
struct expression *exp,
int *pos, enum noside noside, int nargs)
{
struct type *struct_type = check_typedef (value_type (struct_val));
struct type *field_type;
int fieldno = -1;
while (--nargs >= 0)
{
struct value *val = NULL;
int bitpos, bitsize;
bfd_byte *addr;
fieldno++;
/* Skip static fields. */
while (fieldno < TYPE_NFIELDS (struct_type)
&& field_is_static (&TYPE_FIELD (struct_type,
fieldno)))
fieldno++;
if (fieldno >= TYPE_NFIELDS (struct_type))
error (_("too many initializers"));
field_type = TYPE_FIELD_TYPE (struct_type, fieldno);
if (TYPE_CODE (field_type) == TYPE_CODE_UNION
&& TYPE_FIELD_NAME (struct_type, fieldno)[0] == '0')
error (_("don't know which variant you want to set"));
/* Here, struct_type is the type of the inner struct,
while substruct_type is the type of the inner struct.
These are the same for normal structures, but a variant struct
contains anonymous union fields that contain substruct fields.
The value fieldno is the index of the top-level (normal or
anonymous union) field in struct_field, while the value
subfieldno is the index of the actual real (named inner) field
in substruct_type. */
field_type = TYPE_FIELD_TYPE (struct_type, fieldno);
if (val == 0)
val = evaluate_subexp (field_type, exp, pos, noside);
/* Now actually set the field in struct_val. */
/* Assign val to field fieldno. */
if (value_type (val) != field_type)
val = value_cast (field_type, val);
bitsize = TYPE_FIELD_BITSIZE (struct_type, fieldno);
bitpos = TYPE_FIELD_BITPOS (struct_type, fieldno);
addr = value_contents_writeable (struct_val) + bitpos / 8;
if (bitsize)
modify_field (struct_type, addr,
value_as_long (val), bitpos % 8, bitsize);
else
memcpy (addr, value_contents (val),
TYPE_LENGTH (value_type (val)));
}
return struct_val;
}
/* Recursive helper function for setting elements of array tuples.
The target is ARRAY (which has bounds LOW_BOUND to HIGH_BOUND); the
element value is ELEMENT; EXP, POS and NOSIDE are as usual.
Evaluates index expresions and sets the specified element(s) of
ARRAY to ELEMENT. Returns last index value. */
static LONGEST
init_array_element (struct value *array, struct value *element,
struct expression *exp, int *pos,
enum noside noside, LONGEST low_bound, LONGEST high_bound)
{
LONGEST index;
int element_size = TYPE_LENGTH (value_type (element));
if (exp->elts[*pos].opcode == BINOP_COMMA)
{
(*pos)++;
init_array_element (array, element, exp, pos, noside,
low_bound, high_bound);
return init_array_element (array, element,
exp, pos, noside, low_bound, high_bound);
}
else
{
index = value_as_long (evaluate_subexp (NULL_TYPE, exp, pos, noside));
if (index < low_bound || index > high_bound)
error (_("tuple index out of range"));
memcpy (value_contents_raw (array) + (index - low_bound) * element_size,
value_contents (element), element_size);
}
return index;
}
static struct value *
value_f90_subarray (struct value *array,
struct expression *exp, int *pos, enum noside noside)
{
int pc = (*pos) + 1;
LONGEST low_bound, high_bound;
struct type *range = check_typedef (TYPE_INDEX_TYPE (value_type (array)));
enum f90_range_type range_type
= (enum f90_range_type) longest_to_int (exp->elts[pc].longconst);
*pos += 3;
if (range_type == LOW_BOUND_DEFAULT || range_type == BOTH_BOUND_DEFAULT)
low_bound = TYPE_LOW_BOUND (range);
else
low_bound = value_as_long (evaluate_subexp (NULL_TYPE, exp, pos, noside));
if (range_type == HIGH_BOUND_DEFAULT || range_type == BOTH_BOUND_DEFAULT)
high_bound = TYPE_HIGH_BOUND (range);
else
high_bound = value_as_long (evaluate_subexp (NULL_TYPE, exp, pos, noside));
return value_slice (array, low_bound, high_bound - low_bound + 1);
}
/* Promote value ARG1 as appropriate before performing a unary operation
on this argument.
If the result is not appropriate for any particular language then it
needs to patch this function. */
void
unop_promote (const struct language_defn *language, struct gdbarch *gdbarch,
struct value **arg1)
{
struct type *type1;
*arg1 = coerce_ref (*arg1);
type1 = check_typedef (value_type (*arg1));
if (is_integral_type (type1))
{
switch (language->la_language)
{
default:
/* Perform integral promotion for ANSI C/C++.
If not appropropriate for any particular language
it needs to modify this function. */
{
struct type *builtin_int = builtin_type (gdbarch)->builtin_int;
if (TYPE_LENGTH (type1) < TYPE_LENGTH (builtin_int))
*arg1 = value_cast (builtin_int, *arg1);
}
break;
}
}
}
/* Promote values ARG1 and ARG2 as appropriate before performing a binary
operation on those two operands.
If the result is not appropriate for any particular language then it
needs to patch this function. */
void
binop_promote (const struct language_defn *language, struct gdbarch *gdbarch,
struct value **arg1, struct value **arg2)
{
struct type *promoted_type = NULL;
struct type *type1;
struct type *type2;
*arg1 = coerce_ref (*arg1);
*arg2 = coerce_ref (*arg2);
type1 = check_typedef (value_type (*arg1));
type2 = check_typedef (value_type (*arg2));
if ((TYPE_CODE (type1) != TYPE_CODE_FLT
&& TYPE_CODE (type1) != TYPE_CODE_DECFLOAT
&& !is_integral_type (type1))
|| (TYPE_CODE (type2) != TYPE_CODE_FLT
&& TYPE_CODE (type2) != TYPE_CODE_DECFLOAT
&& !is_integral_type (type2)))
return;
if (TYPE_CODE (type1) == TYPE_CODE_DECFLOAT
|| TYPE_CODE (type2) == TYPE_CODE_DECFLOAT)
{
/* No promotion required. */
}
else if (TYPE_CODE (type1) == TYPE_CODE_FLT
|| TYPE_CODE (type2) == TYPE_CODE_FLT)
{
switch (language->la_language)
{
case language_c:
case language_cplus:
case language_asm:
case language_objc:
case language_opencl:
/* No promotion required. */
break;
default:
/* For other languages the result type is unchanged from gdb
version 6.7 for backward compatibility.
If either arg was long double, make sure that value is also long
double. Otherwise use double. */
if (TYPE_LENGTH (type1) * 8 > gdbarch_double_bit (gdbarch)
|| TYPE_LENGTH (type2) * 8 > gdbarch_double_bit (gdbarch))
promoted_type = builtin_type (gdbarch)->builtin_long_double;
else
promoted_type = builtin_type (gdbarch)->builtin_double;
break;
}
}
else if (TYPE_CODE (type1) == TYPE_CODE_BOOL
&& TYPE_CODE (type2) == TYPE_CODE_BOOL)
{
/* No promotion required. */
}
else
/* Integral operations here. */
/* FIXME: Also mixed integral/booleans, with result an integer. */
{
const struct builtin_type *builtin = builtin_type (gdbarch);
unsigned int promoted_len1 = TYPE_LENGTH (type1);
unsigned int promoted_len2 = TYPE_LENGTH (type2);
int is_unsigned1 = TYPE_UNSIGNED (type1);
int is_unsigned2 = TYPE_UNSIGNED (type2);
unsigned int result_len;
int unsigned_operation;
/* Determine type length and signedness after promotion for
both operands. */
if (promoted_len1 < TYPE_LENGTH (builtin->builtin_int))
{
is_unsigned1 = 0;
promoted_len1 = TYPE_LENGTH (builtin->builtin_int);
}
if (promoted_len2 < TYPE_LENGTH (builtin->builtin_int))
{
is_unsigned2 = 0;
promoted_len2 = TYPE_LENGTH (builtin->builtin_int);
}
if (promoted_len1 > promoted_len2)
{
unsigned_operation = is_unsigned1;
result_len = promoted_len1;
}
else if (promoted_len2 > promoted_len1)
{
unsigned_operation = is_unsigned2;
result_len = promoted_len2;
}
else
{
unsigned_operation = is_unsigned1 || is_unsigned2;
result_len = promoted_len1;
}
switch (language->la_language)
{
case language_c:
case language_cplus:
case language_asm:
case language_objc:
if (result_len <= TYPE_LENGTH (builtin->builtin_int))
{
promoted_type = (unsigned_operation
? builtin->builtin_unsigned_int
: builtin->builtin_int);
}
else if (result_len <= TYPE_LENGTH (builtin->builtin_long))
{
promoted_type = (unsigned_operation
? builtin->builtin_unsigned_long
: builtin->builtin_long);
}
else
{
promoted_type = (unsigned_operation
? builtin->builtin_unsigned_long_long
: builtin->builtin_long_long);
}
break;
case language_opencl:
if (result_len <= TYPE_LENGTH (lookup_signed_typename
(language, gdbarch, "int")))
{
promoted_type =
(unsigned_operation
? lookup_unsigned_typename (language, gdbarch, "int")
: lookup_signed_typename (language, gdbarch, "int"));
}
else if (result_len <= TYPE_LENGTH (lookup_signed_typename
(language, gdbarch, "long")))
{
promoted_type =
(unsigned_operation
? lookup_unsigned_typename (language, gdbarch, "long")
: lookup_signed_typename (language, gdbarch,"long"));
}
break;
default:
/* For other languages the result type is unchanged from gdb
version 6.7 for backward compatibility.
If either arg was long long, make sure that value is also long
long. Otherwise use long. */
if (unsigned_operation)
{
if (result_len > gdbarch_long_bit (gdbarch) / HOST_CHAR_BIT)
promoted_type = builtin->builtin_unsigned_long_long;
else
promoted_type = builtin->builtin_unsigned_long;
}
else
{
if (result_len > gdbarch_long_bit (gdbarch) / HOST_CHAR_BIT)
promoted_type = builtin->builtin_long_long;
else
promoted_type = builtin->builtin_long;
}
break;
}
}
if (promoted_type)
{
/* Promote both operands to common type. */
*arg1 = value_cast (promoted_type, *arg1);
*arg2 = value_cast (promoted_type, *arg2);
}
}
static int
ptrmath_type_p (const struct language_defn *lang, struct type *type)
{
type = check_typedef (type);
if (TYPE_CODE (type) == TYPE_CODE_REF)
type = TYPE_TARGET_TYPE (type);
switch (TYPE_CODE (type))
{
case TYPE_CODE_PTR:
case TYPE_CODE_FUNC:
return 1;
case TYPE_CODE_ARRAY:
return TYPE_VECTOR (type) ? 0 : lang->c_style_arrays;
default:
return 0;
}
}
/* Constructs a fake method with the given parameter types.
This function is used by the parser to construct an "expected"
type for method overload resolution. */
static struct type *
make_params (int num_types, struct type **param_types)
{
struct type *type = XCNEW (struct type);
TYPE_MAIN_TYPE (type) = XCNEW (struct main_type);
TYPE_LENGTH (type) = 1;
TYPE_CODE (type) = TYPE_CODE_METHOD;
TYPE_CHAIN (type) = type;
if (num_types > 0)
{
if (param_types[num_types - 1] == NULL)
{
--num_types;
TYPE_VARARGS (type) = 1;
}
else if (TYPE_CODE (check_typedef (param_types[num_types - 1]))
== TYPE_CODE_VOID)
{
--num_types;
/* Caller should have ensured this. */
gdb_assert (num_types == 0);
TYPE_PROTOTYPED (type) = 1;
}
}
TYPE_NFIELDS (type) = num_types;
TYPE_FIELDS (type) = (struct field *)
TYPE_ZALLOC (type, sizeof (struct field) * num_types);
while (num_types-- > 0)
TYPE_FIELD_TYPE (type, num_types) = param_types[num_types];
return type;
}
struct value *
evaluate_subexp_standard (struct type *expect_type,
struct expression *exp, int *pos,
enum noside noside)
{
enum exp_opcode op;
int tem, tem2, tem3;
int pc, pc2 = 0, oldpos;
struct value *arg1 = NULL;
struct value *arg2 = NULL;
struct value *arg3;
struct type *type;
int nargs;
struct value **argvec;
int code;
int ix;
long mem_offset;
struct type **arg_types;
int save_pos1;
struct symbol *function = NULL;
char *function_name = NULL;
pc = (*pos)++;
op = exp->elts[pc].opcode;
switch (op)
{
case OP_SCOPE:
tem = longest_to_int (exp->elts[pc + 2].longconst);
(*pos) += 4 + BYTES_TO_EXP_ELEM (tem + 1);
if (noside == EVAL_SKIP)
goto nosideret;
arg1 = value_aggregate_elt (exp->elts[pc + 1].type,
&exp->elts[pc + 3].string,
expect_type, 0, noside);
if (arg1 == NULL)
error (_("There is no field named %s"), &exp->elts[pc + 3].string);
return arg1;
case OP_LONG:
(*pos) += 3;
return value_from_longest (exp->elts[pc + 1].type,
exp->elts[pc + 2].longconst);
case OP_DOUBLE:
(*pos) += 3;
return value_from_double (exp->elts[pc + 1].type,
exp->elts[pc + 2].doubleconst);
case OP_DECFLOAT:
(*pos) += 3;
return value_from_decfloat (exp->elts[pc + 1].type,
exp->elts[pc + 2].decfloatconst);
case OP_ADL_FUNC:
case OP_VAR_VALUE:
(*pos) += 3;
if (noside == EVAL_SKIP)
goto nosideret;
/* JYG: We used to just return value_zero of the symbol type
if we're asked to avoid side effects. Otherwise we return
value_of_variable (...). However I'm not sure if
value_of_variable () has any side effect.
We need a full value object returned here for whatis_exp ()
to call evaluate_type () and then pass the full value to
value_rtti_target_type () if we are dealing with a pointer
or reference to a base class and print object is on. */
{
struct value *ret = NULL;
TRY
{
ret = value_of_variable (exp->elts[pc + 2].symbol,
exp->elts[pc + 1].block);
}
CATCH (except, RETURN_MASK_ERROR)
{
if (noside == EVAL_AVOID_SIDE_EFFECTS)
ret = value_zero (SYMBOL_TYPE (exp->elts[pc + 2].symbol),
not_lval);
else
throw_exception (except);
}
END_CATCH
return ret;
}
case OP_VAR_ENTRY_VALUE:
(*pos) += 2;
if (noside == EVAL_SKIP)
goto nosideret;
{
struct symbol *sym = exp->elts[pc + 1].symbol;
struct frame_info *frame;
if (noside == EVAL_AVOID_SIDE_EFFECTS)
return value_zero (SYMBOL_TYPE (sym), not_lval);
if (SYMBOL_COMPUTED_OPS (sym) == NULL
|| SYMBOL_COMPUTED_OPS (sym)->read_variable_at_entry == NULL)
error (_("Symbol \"%s\" does not have any specific entry value"),
SYMBOL_PRINT_NAME (sym));
frame = get_selected_frame (NULL);
return SYMBOL_COMPUTED_OPS (sym)->read_variable_at_entry (sym, frame);
}
case OP_LAST:
(*pos) += 2;
return
access_value_history (longest_to_int (exp->elts[pc + 1].longconst));
case OP_REGISTER:
{
const char *name = &exp->elts[pc + 2].string;
int regno;
struct value *val;
(*pos) += 3 + BYTES_TO_EXP_ELEM (exp->elts[pc + 1].longconst + 1);
regno = user_reg_map_name_to_regnum (exp->gdbarch,
name, strlen (name));
if (regno == -1)
error (_("Register $%s not available."), name);
/* In EVAL_AVOID_SIDE_EFFECTS mode, we only need to return
a value with the appropriate register type. Unfortunately,
we don't have easy access to the type of user registers.
So for these registers, we fetch the register value regardless
of the evaluation mode. */
if (noside == EVAL_AVOID_SIDE_EFFECTS
&& regno < gdbarch_num_regs (exp->gdbarch)
+ gdbarch_num_pseudo_regs (exp->gdbarch))
val = value_zero (register_type (exp->gdbarch, regno), not_lval);
else
val = value_of_register (regno, get_selected_frame (NULL));
if (val == NULL)
error (_("Value of register %s not available."), name);
else
return val;
}
case OP_BOOL:
(*pos) += 2;
type = language_bool_type (exp->language_defn, exp->gdbarch);
return value_from_longest (type, exp->elts[pc + 1].longconst);
case OP_INTERNALVAR:
(*pos) += 2;
return value_of_internalvar (exp->gdbarch,
exp->elts[pc + 1].internalvar);
case OP_STRING:
tem = longest_to_int (exp->elts[pc + 1].longconst);
(*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
if (noside == EVAL_SKIP)
goto nosideret;
type = language_string_char_type (exp->language_defn, exp->gdbarch);
return value_string (&exp->elts[pc + 2].string, tem, type);
case OP_OBJC_NSSTRING: /* Objective C Foundation Class
NSString constant. */
tem = longest_to_int (exp->elts[pc + 1].longconst);
(*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
if (noside == EVAL_SKIP)
{
goto nosideret;
}
return value_nsstring (exp->gdbarch, &exp->elts[pc + 2].string, tem + 1);
case OP_ARRAY:
(*pos) += 3;
tem2 = longest_to_int (exp->elts[pc + 1].longconst);
tem3 = longest_to_int (exp->elts[pc + 2].longconst);
nargs = tem3 - tem2 + 1;
type = expect_type ? check_typedef (expect_type) : NULL_TYPE;
if (expect_type != NULL_TYPE && noside != EVAL_SKIP
&& TYPE_CODE (type) == TYPE_CODE_STRUCT)
{
struct value *rec = allocate_value (expect_type);
memset (value_contents_raw (rec), '\0', TYPE_LENGTH (type));
return evaluate_struct_tuple (rec, exp, pos, noside, nargs);
}
if (expect_type != NULL_TYPE && noside != EVAL_SKIP
&& TYPE_CODE (type) == TYPE_CODE_ARRAY)
{
struct type *range_type = TYPE_INDEX_TYPE (type);
struct type *element_type = TYPE_TARGET_TYPE (type);
struct value *array = allocate_value (expect_type);
int element_size = TYPE_LENGTH (check_typedef (element_type));
LONGEST low_bound, high_bound, index;
if (get_discrete_bounds (range_type, &low_bound, &high_bound) < 0)
{
low_bound = 0;
high_bound = (TYPE_LENGTH (type) / element_size) - 1;
}
index = low_bound;
memset (value_contents_raw (array), 0, TYPE_LENGTH (expect_type));
for (tem = nargs; --nargs >= 0;)
{
struct value *element;
int index_pc = 0;
element = evaluate_subexp (element_type, exp, pos, noside);
if (value_type (element) != element_type)
element = value_cast (element_type, element);
if (index_pc)
{
int continue_pc = *pos;
*pos = index_pc;
index = init_array_element (array, element, exp, pos, noside,
low_bound, high_bound);
*pos = continue_pc;
}
else
{
if (index > high_bound)
/* To avoid memory corruption. */
error (_("Too many array elements"));
memcpy (value_contents_raw (array)
+ (index - low_bound) * element_size,
value_contents (element),
element_size);
}
index++;
}
return array;
}
if (expect_type != NULL_TYPE && noside != EVAL_SKIP
&& TYPE_CODE (type) == TYPE_CODE_SET)
{
struct value *set = allocate_value (expect_type);
gdb_byte *valaddr = value_contents_raw (set);
struct type *element_type = TYPE_INDEX_TYPE (type);
struct type *check_type = element_type;
LONGEST low_bound, high_bound;
/* Get targettype of elementtype. */
while (TYPE_CODE (check_type) == TYPE_CODE_RANGE
|| TYPE_CODE (check_type) == TYPE_CODE_TYPEDEF)
check_type = TYPE_TARGET_TYPE (check_type);
if (get_discrete_bounds (element_type, &low_bound, &high_bound) < 0)
error (_("(power)set type with unknown size"));
memset (valaddr, '\0', TYPE_LENGTH (type));
for (tem = 0; tem < nargs; tem++)
{
LONGEST range_low, range_high;
struct type *range_low_type, *range_high_type;
struct value *elem_val;
elem_val = evaluate_subexp (element_type, exp, pos, noside);
range_low_type = range_high_type = value_type (elem_val);
range_low = range_high = value_as_long (elem_val);
/* Check types of elements to avoid mixture of elements from
different types. Also check if type of element is "compatible"
with element type of powerset. */
if (TYPE_CODE (range_low_type) == TYPE_CODE_RANGE)
range_low_type = TYPE_TARGET_TYPE (range_low_type);
if (TYPE_CODE (range_high_type) == TYPE_CODE_RANGE)
range_high_type = TYPE_TARGET_TYPE (range_high_type);
if ((TYPE_CODE (range_low_type) != TYPE_CODE (range_high_type))
|| (TYPE_CODE (range_low_type) == TYPE_CODE_ENUM
&& (range_low_type != range_high_type)))
/* different element modes. */
error (_("POWERSET tuple elements of different mode"));
if ((TYPE_CODE (check_type) != TYPE_CODE (range_low_type))
|| (TYPE_CODE (check_type) == TYPE_CODE_ENUM
&& range_low_type != check_type))
error (_("incompatible POWERSET tuple elements"));
if (range_low > range_high)
{
warning (_("empty POWERSET tuple range"));
continue;
}
if (range_low < low_bound || range_high > high_bound)
error (_("POWERSET tuple element out of range"));
range_low -= low_bound;
range_high -= low_bound;
for (; range_low <= range_high; range_low++)
{
int bit_index = (unsigned) range_low % TARGET_CHAR_BIT;
if (gdbarch_bits_big_endian (exp->gdbarch))
bit_index = TARGET_CHAR_BIT - 1 - bit_index;
valaddr[(unsigned) range_low / TARGET_CHAR_BIT]
|= 1 << bit_index;
}
}
return set;
}