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
|
/* Convert symbols from GDB to GCC
Copyright (C) 2014-2018 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 "compile-internal.h"
#include "symtab.h"
#include "parser-defs.h"
#include "block.h"
#include "objfiles.h"
#include "compile.h"
#include "value.h"
#include "exceptions.h"
#include "gdbtypes.h"
#include "dwarf2loc.h"
/* Object of this type are stored in the compiler's symbol_err_map. */
struct symbol_error
{
/* The symbol. */
const struct symbol *sym;
/* The error message to emit. This is malloc'd and owned by the
hash table. */
char *message;
};
/* Hash function for struct symbol_error. */
static hashval_t
hash_symbol_error (const void *a)
{
const struct symbol_error *se = (const struct symbol_error *) a;
return htab_hash_pointer (se->sym);
}
/* Equality function for struct symbol_error. */
static int
eq_symbol_error (const void *a, const void *b)
{
const struct symbol_error *sea = (const struct symbol_error *) a;
const struct symbol_error *seb = (const struct symbol_error *) b;
return sea->sym == seb->sym;
}
/* Deletion function for struct symbol_error. */
static void
del_symbol_error (void *a)
{
struct symbol_error *se = (struct symbol_error *) a;
xfree (se->message);
xfree (se);
}
/* Associate SYMBOL with some error text. */
static void
insert_symbol_error (htab_t hash, const struct symbol *sym, const char *text)
{
struct symbol_error e;
void **slot;
e.sym = sym;
slot = htab_find_slot (hash, &e, INSERT);
if (*slot == NULL)
{
struct symbol_error *e = XNEW (struct symbol_error);
e->sym = sym;
e->message = xstrdup (text);
*slot = e;
}
}
/* Emit the error message corresponding to SYM, if one exists, and
arrange for it not to be emitted again. */
static void
error_symbol_once (struct compile_c_instance *context,
const struct symbol *sym)
{
struct symbol_error search;
struct symbol_error *err;
if (context->symbol_err_map == NULL)
return;
search.sym = sym;
err = (struct symbol_error *) htab_find (context->symbol_err_map, &search);
if (err == NULL || err->message == NULL)
return;
gdb::unique_xmalloc_ptr<char> message (err->message);
err->message = NULL;
error (_("%s"), message.get ());
}
/* Compute the name of the pointer representing a local symbol's
address. */
static gdb::unique_xmalloc_ptr<char>
symbol_substitution_name (struct symbol *sym)
{
return gdb::unique_xmalloc_ptr<char>
(concat ("__", SYMBOL_NATURAL_NAME (sym), "_ptr", (char *) NULL));
}
/* Convert a given symbol, SYM, to the compiler's representation.
CONTEXT is the compiler instance. IS_GLOBAL is true if the
symbol came from the global scope. IS_LOCAL is true if the symbol
came from a local scope. (Note that the two are not strictly
inverses because the symbol might have come from the static
scope.) */
static void
convert_one_symbol (struct compile_c_instance *context,
struct block_symbol sym,
int is_global,
int is_local)
{
gcc_type sym_type;
const char *filename = symbol_symtab (sym.symbol)->filename;
unsigned short line = SYMBOL_LINE (sym.symbol);
error_symbol_once (context, sym.symbol);
if (SYMBOL_CLASS (sym.symbol) == LOC_LABEL)
sym_type = 0;
else
sym_type = convert_type (context, SYMBOL_TYPE (sym.symbol));
if (SYMBOL_DOMAIN (sym.symbol) == STRUCT_DOMAIN)
{
/* Binding a tag, so we don't need to build a decl. */
C_CTX (context)->c_ops->tagbind (C_CTX (context),
SYMBOL_NATURAL_NAME (sym.symbol),
sym_type, filename, line);
}
else
{
gcc_decl decl;
enum gcc_c_symbol_kind kind;
CORE_ADDR addr = 0;
gdb::unique_xmalloc_ptr<char> symbol_name;
switch (SYMBOL_CLASS (sym.symbol))
{
case LOC_TYPEDEF:
kind = GCC_C_SYMBOL_TYPEDEF;
break;
case LOC_LABEL:
kind = GCC_C_SYMBOL_LABEL;
addr = SYMBOL_VALUE_ADDRESS (sym.symbol);
break;
case LOC_BLOCK:
kind = GCC_C_SYMBOL_FUNCTION;
addr = BLOCK_START (SYMBOL_BLOCK_VALUE (sym.symbol));
if (is_global && TYPE_GNU_IFUNC (SYMBOL_TYPE (sym.symbol)))
addr = gnu_ifunc_resolve_addr (target_gdbarch (), addr);
break;
case LOC_CONST:
if (TYPE_CODE (SYMBOL_TYPE (sym.symbol)) == TYPE_CODE_ENUM)
{
/* Already handled by convert_enum. */
return;
}
C_CTX (context)->c_ops->build_constant
(C_CTX (context),
sym_type, SYMBOL_NATURAL_NAME (sym.symbol),
SYMBOL_VALUE (sym.symbol),
filename, line);
return;
case LOC_CONST_BYTES:
error (_("Unsupported LOC_CONST_BYTES for symbol \"%s\"."),
SYMBOL_PRINT_NAME (sym.symbol));
case LOC_UNDEF:
internal_error (__FILE__, __LINE__, _("LOC_UNDEF found for \"%s\"."),
SYMBOL_PRINT_NAME (sym.symbol));
case LOC_COMMON_BLOCK:
error (_("Fortran common block is unsupported for compilation "
"evaluaton of symbol \"%s\"."),
SYMBOL_PRINT_NAME (sym.symbol));
case LOC_OPTIMIZED_OUT:
error (_("Symbol \"%s\" cannot be used for compilation evaluation "
"as it is optimized out."),
SYMBOL_PRINT_NAME (sym.symbol));
case LOC_COMPUTED:
if (is_local)
goto substitution;
/* Probably TLS here. */
warning (_("Symbol \"%s\" is thread-local and currently can only "
"be referenced from the current thread in "
"compiled code."),
SYMBOL_PRINT_NAME (sym.symbol));
/* FALLTHROUGH */
case LOC_UNRESOLVED:
/* 'symbol_name' cannot be used here as that one is used only for
local variables from compile_dwarf_expr_to_c.
Global variables can be accessed by GCC only by their address, not
by their name. */
{
struct value *val;
struct frame_info *frame = NULL;
if (symbol_read_needs_frame (sym.symbol))
{
frame = get_selected_frame (NULL);
if (frame == NULL)
error (_("Symbol \"%s\" cannot be used because "
"there is no selected frame"),
SYMBOL_PRINT_NAME (sym.symbol));
}
val = read_var_value (sym.symbol, sym.block, frame);
if (VALUE_LVAL (val) != lval_memory)
error (_("Symbol \"%s\" cannot be used for compilation "
"evaluation as its address has not been found."),
SYMBOL_PRINT_NAME (sym.symbol));
kind = GCC_C_SYMBOL_VARIABLE;
addr = value_address (val);
}
break;
case LOC_REGISTER:
case LOC_ARG:
case LOC_REF_ARG:
case LOC_REGPARM_ADDR:
case LOC_LOCAL:
substitution:
kind = GCC_C_SYMBOL_VARIABLE;
symbol_name = symbol_substitution_name (sym.symbol);
break;
case LOC_STATIC:
kind = GCC_C_SYMBOL_VARIABLE;
addr = SYMBOL_VALUE_ADDRESS (sym.symbol);
break;
case LOC_FINAL_VALUE:
default:
gdb_assert_not_reached ("Unreachable case in convert_one_symbol.");
}
/* Don't emit local variable decls for a raw expression. */
if (context->base.scope != COMPILE_I_RAW_SCOPE
|| symbol_name == NULL)
{
decl = C_CTX (context)->c_ops->build_decl
(C_CTX (context),
SYMBOL_NATURAL_NAME (sym.symbol),
kind,
sym_type,
symbol_name.get (), addr,
filename, line);
C_CTX (context)->c_ops->bind (C_CTX (context), decl, is_global);
}
}
}
/* Convert a full symbol to its gcc form. CONTEXT is the compiler to
use, IDENTIFIER is the name of the symbol, SYM is the symbol
itself, and DOMAIN is the domain which was searched. */
static void
convert_symbol_sym (struct compile_c_instance *context, const char *identifier,
struct block_symbol sym, domain_enum domain)
{
const struct block *static_block;
int is_local_symbol;
/* If we found a symbol and it is not in the static or global
scope, then we should first convert any static or global scope
symbol of the same name. This lets this unusual case work:
int x; // Global.
int func(void)
{
int x;
// At this spot, evaluate "extern int x; x"
}
*/
static_block = block_static_block (sym.block);
/* STATIC_BLOCK is NULL if FOUND_BLOCK is the global block. */
is_local_symbol = (sym.block != static_block && static_block != NULL);
if (is_local_symbol)
{
struct block_symbol global_sym;
global_sym = lookup_symbol (identifier, NULL, domain, NULL);
/* If the outer symbol is in the static block, we ignore it, as
it cannot be referenced. */
if (global_sym.symbol != NULL
&& global_sym.block != block_static_block (global_sym.block))
{
if (compile_debug)
fprintf_unfiltered (gdb_stdlog,
"gcc_convert_symbol \"%s\": global symbol\n",
identifier);
convert_one_symbol (context, global_sym, 1, 0);
}
}
if (compile_debug)
fprintf_unfiltered (gdb_stdlog,
"gcc_convert_symbol \"%s\": local symbol\n",
identifier);
convert_one_symbol (context, sym, 0, is_local_symbol);
}
/* Convert a minimal symbol to its gcc form. CONTEXT is the compiler
to use and BMSYM is the minimal symbol to convert. */
static void
convert_symbol_bmsym (struct compile_c_instance *context,
struct bound_minimal_symbol bmsym)
{
struct minimal_symbol *msym = bmsym.minsym;
struct objfile *objfile = bmsym.objfile;
struct type *type;
enum gcc_c_symbol_kind kind;
gcc_type sym_type;
gcc_decl decl;
CORE_ADDR addr;
addr = MSYMBOL_VALUE_ADDRESS (objfile, msym);
/* Conversion copied from write_exp_msymbol. */
switch (MSYMBOL_TYPE (msym))
{
case mst_text:
case mst_file_text:
case mst_solib_trampoline:
type = objfile_type (objfile)->nodebug_text_symbol;
kind = GCC_C_SYMBOL_FUNCTION;
break;
case mst_text_gnu_ifunc:
type = objfile_type (objfile)->nodebug_text_gnu_ifunc_symbol;
kind = GCC_C_SYMBOL_FUNCTION;
addr = gnu_ifunc_resolve_addr (target_gdbarch (), addr);
break;
case mst_data:
case mst_file_data:
case mst_bss:
case mst_file_bss:
type = objfile_type (objfile)->nodebug_data_symbol;
kind = GCC_C_SYMBOL_VARIABLE;
break;
case mst_slot_got_plt:
type = objfile_type (objfile)->nodebug_got_plt_symbol;
kind = GCC_C_SYMBOL_FUNCTION;
break;
default:
type = objfile_type (objfile)->nodebug_unknown_symbol;
kind = GCC_C_SYMBOL_VARIABLE;
break;
}
sym_type = convert_type (context, type);
decl = C_CTX (context)->c_ops->build_decl (C_CTX (context),
MSYMBOL_NATURAL_NAME (msym),
kind, sym_type, NULL, addr,
NULL, 0);
C_CTX (context)->c_ops->bind (C_CTX (context), decl, 1 /* is_global */);
}
/* See compile-internal.h. */
void
gcc_convert_symbol (void *datum,
struct gcc_c_context *gcc_context,
enum gcc_c_oracle_request request,
const char *identifier)
{
struct compile_c_instance *context = (struct compile_c_instance *) datum;
domain_enum domain;
int found = 0;
switch (request)
{
case GCC_C_ORACLE_SYMBOL:
domain = VAR_DOMAIN;
break;
case GCC_C_ORACLE_TAG:
domain = STRUCT_DOMAIN;
break;
case GCC_C_ORACLE_LABEL:
domain = LABEL_DOMAIN;
break;
default:
gdb_assert_not_reached ("Unrecognized oracle request.");
}
/* We can't allow exceptions to escape out of this callback. Safest
is to simply emit a gcc error. */
TRY
{
struct block_symbol sym;
sym = lookup_symbol (identifier, context->base.block, domain, NULL);
if (sym.symbol != NULL)
{
convert_symbol_sym (context, identifier, sym, domain);
found = 1;
}
else if (domain == VAR_DOMAIN)
{
struct bound_minimal_symbol bmsym;
bmsym = lookup_minimal_symbol (identifier, NULL, NULL);
if (bmsym.minsym != NULL)
{
convert_symbol_bmsym (context, bmsym);
found = 1;
}
}
}
CATCH (e, RETURN_MASK_ALL)
{
C_CTX (context)->c_ops->error (C_CTX (context), e.message);
}
END_CATCH
if (compile_debug && !found)
fprintf_unfiltered (gdb_stdlog,
"gcc_convert_symbol \"%s\": lookup_symbol failed\n",
identifier);
return;
}
/* See compile-internal.h. */
gcc_address
gcc_symbol_address (void *datum, struct gcc_c_context *gcc_context,
const char *identifier)
{
struct compile_c_instance *context = (struct compile_c_instance *) datum;
gcc_address result = 0;
int found = 0;
/* We can't allow exceptions to escape out of this callback. Safest
is to simply emit a gcc error. */
TRY
{
struct symbol *sym;
/* We only need global functions here. */
sym = lookup_symbol (identifier, NULL, VAR_DOMAIN, NULL).symbol;
if (sym != NULL && SYMBOL_CLASS (sym) == LOC_BLOCK)
{
if (compile_debug)
fprintf_unfiltered (gdb_stdlog,
"gcc_symbol_address \"%s\": full symbol\n",
identifier);
result = BLOCK_START (SYMBOL_BLOCK_VALUE (sym));
if (TYPE_GNU_IFUNC (SYMBOL_TYPE (sym)))
result = gnu_ifunc_resolve_addr (target_gdbarch (), result);
found = 1;
}
else
{
struct bound_minimal_symbol msym;
msym = lookup_bound_minimal_symbol (identifier);
if (msym.minsym != NULL)
{
if (compile_debug)
fprintf_unfiltered (gdb_stdlog,
"gcc_symbol_address \"%s\": minimal "
"symbol\n",
identifier);
result = BMSYMBOL_VALUE_ADDRESS (msym);
if (MSYMBOL_TYPE (msym.minsym) == mst_text_gnu_ifunc)
result = gnu_ifunc_resolve_addr (target_gdbarch (), result);
found = 1;
}
}
}
CATCH (e, RETURN_MASK_ERROR)
{
C_CTX (context)->c_ops->error (C_CTX (context), e.message);
}
END_CATCH
if (compile_debug && !found)
fprintf_unfiltered (gdb_stdlog,
"gcc_symbol_address \"%s\": failed\n",
identifier);
return result;
}
/* A hash function for symbol names. */
static hashval_t
hash_symname (const void *a)
{
const struct symbol *sym = (const struct symbol *) a;
return htab_hash_string (SYMBOL_NATURAL_NAME (sym));
}
/* A comparison function for hash tables that just looks at symbol
names. */
static int
eq_symname (const void *a, const void *b)
{
const struct symbol *syma = (const struct symbol *) a;
const struct symbol *symb = (const struct symbol *) b;
return strcmp (SYMBOL_NATURAL_NAME (syma), SYMBOL_NATURAL_NAME (symb)) == 0;
}
/* If a symbol with the same name as SYM is already in HASHTAB, return
1. Otherwise, add SYM to HASHTAB and return 0. */
static int
symbol_seen (htab_t hashtab, struct symbol *sym)
{
void **slot;
slot = htab_find_slot (hashtab, sym, INSERT);
if (*slot != NULL)
return 1;
*slot = sym;
return 0;
}
/* Generate C code to compute the length of a VLA. */
static void
generate_vla_size (struct compile_c_instance *compiler,
string_file &stream,
struct gdbarch *gdbarch,
unsigned char *registers_used,
CORE_ADDR pc,
struct type *type,
struct symbol *sym)
{
type = check_typedef (type);
if (TYPE_IS_REFERENCE (type))
type = check_typedef (TYPE_TARGET_TYPE (type));
switch (TYPE_CODE (type))
{
case TYPE_CODE_RANGE:
{
if (TYPE_HIGH_BOUND_KIND (type) == PROP_LOCEXPR
|| TYPE_HIGH_BOUND_KIND (type) == PROP_LOCLIST)
{
const struct dynamic_prop *prop = &TYPE_RANGE_DATA (type)->high;
std::string name = c_get_range_decl_name (prop);
dwarf2_compile_property_to_c (stream, name.c_str (),
gdbarch, registers_used,
prop, pc, sym);
}
}
break;
case TYPE_CODE_ARRAY:
generate_vla_size (compiler, stream, gdbarch, registers_used, pc,
TYPE_INDEX_TYPE (type), sym);
generate_vla_size (compiler, stream, gdbarch, registers_used, pc,
TYPE_TARGET_TYPE (type), sym);
break;
case TYPE_CODE_UNION:
case TYPE_CODE_STRUCT:
{
int i;
for (i = 0; i < TYPE_NFIELDS (type); ++i)
if (!field_is_static (&TYPE_FIELD (type, i)))
generate_vla_size (compiler, stream, gdbarch, registers_used, pc,
TYPE_FIELD_TYPE (type, i), sym);
}
break;
}
}
/* Generate C code to compute the address of SYM. */
static void
generate_c_for_for_one_variable (struct compile_c_instance *compiler,
string_file &stream,
struct gdbarch *gdbarch,
unsigned char *registers_used,
CORE_ADDR pc,
struct symbol *sym)
{
TRY
{
if (is_dynamic_type (SYMBOL_TYPE (sym)))
{
/* We need to emit to a temporary buffer in case an error
occurs in the middle. */
string_file local_file;
generate_vla_size (compiler, local_file, gdbarch, registers_used, pc,
SYMBOL_TYPE (sym), sym);
stream.write (local_file.c_str (), local_file.size ());
}
if (SYMBOL_COMPUTED_OPS (sym) != NULL)
{
gdb::unique_xmalloc_ptr<char> generated_name
= symbol_substitution_name (sym);
/* We need to emit to a temporary buffer in case an error
occurs in the middle. */
string_file local_file;
SYMBOL_COMPUTED_OPS (sym)->generate_c_location (sym, local_file,
gdbarch,
registers_used,
pc,
generated_name.get ());
stream.write (local_file.c_str (), local_file.size ());
}
else
{
switch (SYMBOL_CLASS (sym))
{
case LOC_REGISTER:
case LOC_ARG:
case LOC_REF_ARG:
case LOC_REGPARM_ADDR:
case LOC_LOCAL:
error (_("Local symbol unhandled when generating C code."));
case LOC_COMPUTED:
gdb_assert_not_reached (_("LOC_COMPUTED variable "
"missing a method."));
default:
/* Nothing to do for all other cases, as they don't represent
local variables. */
break;
}
}
}
CATCH (e, RETURN_MASK_ERROR)
{
if (compiler->symbol_err_map == NULL)
compiler->symbol_err_map = htab_create_alloc (10,
hash_symbol_error,
eq_symbol_error,
del_symbol_error,
xcalloc,
xfree);
insert_symbol_error (compiler->symbol_err_map, sym, e.message);
}
END_CATCH
}
/* See compile-internal.h. */
gdb::unique_xmalloc_ptr<unsigned char>
generate_c_for_variable_locations (struct compile_c_instance *compiler,
string_file &stream,
struct gdbarch *gdbarch,
const struct block *block,
CORE_ADDR pc)
{
const struct block *static_block = block_static_block (block);
/* If we're already in the static or global block, there is nothing
to write. */
if (static_block == NULL || block == static_block)
return NULL;
gdb::unique_xmalloc_ptr<unsigned char> registers_used
(XCNEWVEC (unsigned char, gdbarch_num_regs (gdbarch)));
/* Ensure that a given name is only entered once. This reflects the
reality of shadowing. */
htab_up symhash (htab_create_alloc (1, hash_symname, eq_symname, NULL,
xcalloc, xfree));
while (1)
{
struct symbol *sym;
struct block_iterator iter;
/* Iterate over symbols in this block, generating code to
compute the location of each local variable. */
for (sym = block_iterator_first (block, &iter);
sym != NULL;
sym = block_iterator_next (&iter))
{
if (!symbol_seen (symhash.get (), sym))
generate_c_for_for_one_variable (compiler, stream, gdbarch,
registers_used.get (), pc, sym);
}
/* If we just finished the outermost block of a function, we're
done. */
if (BLOCK_FUNCTION (block) != NULL)
break;
block = BLOCK_SUPERBLOCK (block);
}
return registers_used;
}
|