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
|
/* Subroutines for insn-output.c for Windows NT.
Contributed by Douglas Rupp (drupp@cs.washington.edu)
Copyright (C) 1995, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
Free Software Foundation, Inc.
This file is part of GCC.
GCC 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 2, or (at your option) any later
version.
GCC 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 GCC; see the file COPYING. If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "rtl.h"
#include "regs.h"
#include "hard-reg-set.h"
#include "output.h"
#include "tree.h"
#include "flags.h"
#include "tm_p.h"
#include "toplev.h"
#include "hashtab.h"
#include "ggc.h"
/* i386/PE specific attribute support.
i386/PE has two new attributes:
dllexport - for exporting a function/variable that will live in a dll
dllimport - for importing a function/variable from a dll
Microsoft allows multiple declspecs in one __declspec, separating
them with spaces. We do NOT support this. Instead, use __declspec
multiple times.
*/
static tree associated_type (tree);
static const char * gen_stdcall_suffix (tree);
static const char * gen_fastcall_suffix (tree);
static int i386_pe_dllexport_p (tree);
static int i386_pe_dllimport_p (tree);
static void i386_pe_mark_dllexport (tree);
static void i386_pe_mark_dllimport (tree);
/* This is we how mark internal identifiers with dllimport or dllexport
attributes. */
#ifndef DLL_IMPORT_PREFIX
#define DLL_IMPORT_PREFIX "#i."
#endif
#ifndef DLL_EXPORT_PREFIX
#define DLL_EXPORT_PREFIX "#e."
#endif
/* Handle a "dllimport" or "dllexport" attribute;
arguments as in struct attribute_spec.handler. */
tree
ix86_handle_dll_attribute (tree * pnode, tree name, tree args, int flags,
bool *no_add_attrs)
{
tree node = *pnode;
/* These attributes may apply to structure and union types being created,
but otherwise should pass to the declaration involved. */
if (!DECL_P (node))
{
if (flags & ((int) ATTR_FLAG_DECL_NEXT | (int) ATTR_FLAG_FUNCTION_NEXT
| (int) ATTR_FLAG_ARRAY_NEXT))
{
*no_add_attrs = true;
return tree_cons (name, args, NULL_TREE);
}
if (TREE_CODE (node) != RECORD_TYPE && TREE_CODE (node) != UNION_TYPE)
{
warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Report error on dllimport ambiguities seen now before they cause
any damage. */
else if (is_attribute_p ("dllimport", name))
{
/* Like MS, treat definition of dllimported variables and
non-inlined functions on declaration as syntax errors.
We allow the attribute for function definitions if declared
inline, but just ignore it in i386_pe_dllimport_p. */
if (TREE_CODE (node) == FUNCTION_DECL && DECL_INITIAL (node)
&& !DECL_INLINE (node))
{
error ("%Jfunction `%D' definition is marked dllimport.", node, node);
*no_add_attrs = true;
}
else if (TREE_CODE (node) == VAR_DECL)
{
if (DECL_INITIAL (node))
{
error ("%Jvariable `%D' definition is marked dllimport.",
node, node);
*no_add_attrs = true;
}
/* `extern' needn't be specified with dllimport.
Specify `extern' now and hope for the best. Sigh. */
DECL_EXTERNAL (node) = 1;
/* Also, implicitly give dllimport'd variables declared within
a function global scope, unless declared static. */
if (current_function_decl != NULL_TREE && !TREE_STATIC (node))
TREE_PUBLIC (node) = 1;
}
}
/* Report error if symbol is not accessible at global scope. */
if (!TREE_PUBLIC (node)
&& (TREE_CODE (node) == VAR_DECL
|| TREE_CODE (node) == FUNCTION_DECL))
{
error ("%Jexternal linkage required for symbol '%D' because of "
"'%s' attribute.", node, node, IDENTIFIER_POINTER (name));
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Handle a "shared" attribute;
arguments as in struct attribute_spec.handler. */
tree
ix86_handle_shared_attribute (tree *node, tree name,
tree args ATTRIBUTE_UNUSED,
int flags ATTRIBUTE_UNUSED, bool *no_add_attrs)
{
if (TREE_CODE (*node) != VAR_DECL)
{
warning ("`%s' attribute only applies to variables",
IDENTIFIER_POINTER (name));
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Return the type that we should use to determine if DECL is
imported or exported. */
static tree
associated_type (tree decl)
{
tree t = NULL_TREE;
/* In the C++ frontend, DECL_CONTEXT for a method doesn't actually refer
to the containing class. So we look at the 'this' arg. */
if (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
{
/* Artificial methods are not affected by the import/export status
of their class unless they are COMDAT. Implicit copy ctor's and
dtor's are not affected by class status but virtual and
non-virtual thunks are. */
if (!DECL_ARTIFICIAL (decl) || DECL_COMDAT (decl))
t = TYPE_MAIN_VARIANT
(TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (decl)))));
}
else if (DECL_CONTEXT (decl)
&& TREE_CODE_CLASS (TREE_CODE (DECL_CONTEXT (decl))) == 't')
t = DECL_CONTEXT (decl);
return t;
}
/* Return nonzero if DECL is a dllexport'd object. */
static int
i386_pe_dllexport_p (tree decl)
{
tree exp;
if (TREE_CODE (decl) != VAR_DECL
&& TREE_CODE (decl) != FUNCTION_DECL)
return 0;
exp = lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl));
if (exp)
return 1;
/* Class members get the dllexport status of their class. */
if (associated_type (decl))
{
exp = lookup_attribute ("dllexport",
TYPE_ATTRIBUTES (associated_type (decl)));
if (exp)
return 1;
}
return 0;
}
/* Return nonzero if DECL is a dllimport'd object. */
static int
i386_pe_dllimport_p (tree decl)
{
tree imp;
int context_imp = 0;
if (TREE_CODE (decl) == FUNCTION_DECL
&& TARGET_NOP_FUN_DLLIMPORT)
return 0;
if (TREE_CODE (decl) != VAR_DECL
&& TREE_CODE (decl) != FUNCTION_DECL)
return 0;
imp = lookup_attribute ("dllimport", DECL_ATTRIBUTES (decl));
/* Class members get the dllimport status of their class. */
if (!imp && associated_type (decl))
{
imp = lookup_attribute ("dllimport",
TYPE_ATTRIBUTES (associated_type (decl)));
if (imp)
context_imp = 1;
}
if (imp)
{
/* Don't mark defined functions as dllimport. If the definition
itself was marked with dllimport, than ix86_handle_dll_attribute
reports an error. This handles the case when the definition
overrides an earlier declaration. */
if (TREE_CODE (decl) == FUNCTION_DECL && DECL_INITIAL (decl)
&& !DECL_INLINE (decl))
{
/* Don't warn about artificial methods. */
if (!DECL_ARTIFICIAL (decl))
warning ("%Jfunction '%D' is defined after prior declaration "
"as dllimport: attribute ignored", decl, decl);
return 0;
}
/* We ignore the dllimport attribute for inline member functions.
This differs from MSVC behavior which treats it like GNUC
'extern inline' extension. */
else if (TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl))
{
if (extra_warnings)
warning ("%Jinline function '%D' is declared as dllimport: "
"attribute ignored.", decl, decl);
return 0;
}
/* Don't allow definitions of static data members in dllimport class,
Just ignore attribute for vtable data. */
else if (TREE_CODE (decl) == VAR_DECL
&& TREE_STATIC (decl) && TREE_PUBLIC (decl)
&& !DECL_EXTERNAL (decl) && context_imp)
{
if (!DECL_VIRTUAL_P (decl))
error ("%Jdefinition of static data member '%D' of "
"dllimport'd class.", decl, decl);
return 0;
}
/* Since we can't treat a pointer to a dllimport'd symbol as a
constant address, we turn off the attribute on C++ virtual
methods to allow creation of vtables using thunks. Don't mark
artificial methods either (in associated_type, only COMDAT
artificial method get import status from class context). */
else if (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE
&& (DECL_VIRTUAL_P (decl) || DECL_ARTIFICIAL (decl)))
return 0;
return 1;
}
return 0;
}
/* Return nonzero if SYMBOL is marked as being dllexport'd. */
int
i386_pe_dllexport_name_p (const char *symbol)
{
return (strncmp (DLL_EXPORT_PREFIX, symbol,
strlen (DLL_EXPORT_PREFIX)) == 0);
}
/* Return nonzero if SYMBOL is marked as being dllimport'd. */
int
i386_pe_dllimport_name_p (const char *symbol)
{
return (strncmp (DLL_IMPORT_PREFIX, symbol,
strlen (DLL_IMPORT_PREFIX)) == 0);
}
/* Mark a DECL as being dllexport'd.
Note that we override the previous setting (eg: dllimport). */
static void
i386_pe_mark_dllexport (tree decl)
{
const char *oldname;
char *newname;
rtx rtlname;
tree idp;
rtlname = XEXP (DECL_RTL (decl), 0);
if (GET_CODE (rtlname) == SYMBOL_REF)
oldname = XSTR (rtlname, 0);
else if (GET_CODE (rtlname) == MEM
&& GET_CODE (XEXP (rtlname, 0)) == SYMBOL_REF)
oldname = XSTR (XEXP (rtlname, 0), 0);
else
abort ();
if (i386_pe_dllimport_name_p (oldname))
{
warning ("%Jinconsistent dll linkage for '%D', dllexport assumed.",
decl, decl);
/* Remove DLL_IMPORT_PREFIX. */
oldname += strlen (DLL_IMPORT_PREFIX);
DECL_NON_ADDR_CONST_P (decl) = 0;
}
else if (i386_pe_dllexport_name_p (oldname))
return; /* already done */
newname = alloca (strlen (DLL_EXPORT_PREFIX) + strlen (oldname) + 1);
sprintf (newname, "%s%s", DLL_EXPORT_PREFIX, oldname);
/* We pass newname through get_identifier to ensure it has a unique
address. RTL processing can sometimes peek inside the symbol ref
and compare the string's addresses to see if two symbols are
identical. */
idp = get_identifier (newname);
XEXP (DECL_RTL (decl), 0) =
gen_rtx (SYMBOL_REF, Pmode, IDENTIFIER_POINTER (idp));
}
/* Mark a DECL as being dllimport'd. */
static void
i386_pe_mark_dllimport (tree decl)
{
const char *oldname;
char *newname;
tree idp;
rtx rtlname, newrtl;
rtlname = XEXP (DECL_RTL (decl), 0);
if (GET_CODE (rtlname) == SYMBOL_REF)
oldname = XSTR (rtlname, 0);
else if (GET_CODE (rtlname) == MEM
&& GET_CODE (XEXP (rtlname, 0)) == SYMBOL_REF)
oldname = XSTR (XEXP (rtlname, 0), 0);
else
abort ();
if (i386_pe_dllexport_name_p (oldname))
{
error ("`%s' declared as both exported to and imported from a DLL",
IDENTIFIER_POINTER (DECL_NAME (decl)));
return;
}
else if (i386_pe_dllimport_name_p (oldname))
{
/* Already done, but do a sanity check to prevent assembler errors. */
if (!DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl))
{
error ("%Jfailure in redeclaration of '%D': dllimport'd "
"symbol lacks external linkage.", decl, decl);
abort();
}
return;
}
newname = alloca (strlen (DLL_IMPORT_PREFIX) + strlen (oldname) + 1);
sprintf (newname, "%s%s", DLL_IMPORT_PREFIX, oldname);
/* We pass newname through get_identifier to ensure it has a unique
address. RTL processing can sometimes peek inside the symbol ref
and compare the string's addresses to see if two symbols are
identical. */
idp = get_identifier (newname);
newrtl = gen_rtx (MEM, Pmode,
gen_rtx (SYMBOL_REF, Pmode,
IDENTIFIER_POINTER (idp)));
XEXP (DECL_RTL (decl), 0) = newrtl;
/* Can't treat a pointer to this as a constant address */
DECL_NON_ADDR_CONST_P (decl) = 1;
}
/* Return string which is the former assembler name modified with a
prefix consisting of FASTCALL_PREFIX and a suffix consisting of an
atsign (@) followed by the number of bytes of arguments. */
static const char *
gen_fastcall_suffix (tree decl)
{
int total = 0;
const char *asmname = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
char *newsym;
if (TYPE_ARG_TYPES (TREE_TYPE (decl)))
if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (decl))))
== void_type_node)
{
tree formal_type = TYPE_ARG_TYPES (TREE_TYPE (decl));
/* Quit if we hit an incomplete type. Error is reported
by convert_arguments in c-typeck.c or cp/typeck.c. */
while (TREE_VALUE (formal_type) != void_type_node
&& COMPLETE_TYPE_P (TREE_VALUE (formal_type)))
{
int parm_size
= TREE_INT_CST_LOW (TYPE_SIZE (TREE_VALUE (formal_type)));
/* Must round up to include padding. This is done the same
way as in store_one_arg. */
parm_size = ((parm_size + PARM_BOUNDARY - 1)
/ PARM_BOUNDARY * PARM_BOUNDARY);
total += parm_size;
formal_type = TREE_CHAIN (formal_type);
}
}
/* Assume max of 8 base 10 digits in the suffix. */
newsym = xmalloc (1 + strlen (asmname) + 1 + 8 + 1);
sprintf (newsym, "%c%s@%d", FASTCALL_PREFIX, asmname, total/BITS_PER_UNIT);
return IDENTIFIER_POINTER (get_identifier (newsym));
}
/* Return string which is the former assembler name modified with a
suffix consisting of an atsign (@) followed by the number of bytes of
arguments */
static const char *
gen_stdcall_suffix (tree decl)
{
int total = 0;
/* ??? This probably should use XSTR (XEXP (DECL_RTL (decl), 0), 0) instead
of DECL_ASSEMBLER_NAME. */
const char *asmname = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
char *newsym;
if (TYPE_ARG_TYPES (TREE_TYPE (decl)))
if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (decl))))
== void_type_node)
{
tree formal_type = TYPE_ARG_TYPES (TREE_TYPE (decl));
/* Quit if we hit an incomplete type. Error is reported
by convert_arguments in c-typeck.c or cp/typeck.c. */
while (TREE_VALUE (formal_type) != void_type_node
&& COMPLETE_TYPE_P (TREE_VALUE (formal_type)))
{
int parm_size
= TREE_INT_CST_LOW (TYPE_SIZE (TREE_VALUE (formal_type)));
/* Must round up to include padding. This is done the same
way as in store_one_arg. */
parm_size = ((parm_size + PARM_BOUNDARY - 1)
/ PARM_BOUNDARY * PARM_BOUNDARY);
total += parm_size;
formal_type = TREE_CHAIN (formal_type);
}
}
/* Assume max of 8 base 10 digits in the suffix. */
newsym = xmalloc (strlen (asmname) + 1 + 8 + 1);
sprintf (newsym, "%s@%d", asmname, total/BITS_PER_UNIT);
return IDENTIFIER_POINTER (get_identifier (newsym));
}
void
i386_pe_encode_section_info (tree decl, rtx rtl, int first)
{
default_encode_section_info (decl, rtl, first);
if (TREE_CODE (decl) == FUNCTION_DECL)
{
if (lookup_attribute ("stdcall",
TYPE_ATTRIBUTES (TREE_TYPE (decl))))
XEXP (DECL_RTL (decl), 0) =
gen_rtx (SYMBOL_REF, Pmode, gen_stdcall_suffix (decl));
else if (lookup_attribute ("fastcall",
TYPE_ATTRIBUTES (TREE_TYPE (decl))))
XEXP (DECL_RTL (decl), 0) =
gen_rtx (SYMBOL_REF, Pmode, gen_fastcall_suffix (decl));
}
/* Mark the decl so we can tell from the rtl whether the object is
dllexport'd or dllimport'd. This also handles dllexport/dllimport
override semantics. */
if (i386_pe_dllexport_p (decl))
i386_pe_mark_dllexport (decl);
else if (i386_pe_dllimport_p (decl))
i386_pe_mark_dllimport (decl);
/* It might be that DECL has already been marked as dllimport, but a
subsequent definition nullified that. The attribute is gone but
DECL_RTL still has (DLL_IMPORT_PREFIX) prefixed. We need to remove
that. Ditto for the DECL_NON_ADDR_CONST_P flag. */
else if ((TREE_CODE (decl) == FUNCTION_DECL
|| TREE_CODE (decl) == VAR_DECL)
&& DECL_RTL (decl) != NULL_RTX
&& GET_CODE (DECL_RTL (decl)) == MEM
&& GET_CODE (XEXP (DECL_RTL (decl), 0)) == MEM
&& GET_CODE (XEXP (XEXP (DECL_RTL (decl), 0), 0)) == SYMBOL_REF
&& i386_pe_dllimport_name_p (XSTR (XEXP (XEXP (DECL_RTL (decl), 0), 0), 0)))
{
const char *oldname = XSTR (XEXP (XEXP (DECL_RTL (decl), 0), 0), 0);
/* Remove DLL_IMPORT_PREFIX. */
tree idp = get_identifier (oldname + strlen (DLL_IMPORT_PREFIX));
rtx newrtl = gen_rtx (SYMBOL_REF, Pmode, IDENTIFIER_POINTER (idp));
if (DECL_INITIAL (decl) || !DECL_EXTERNAL (decl))
warning ("%J'%D' defined locally after being "
"referenced with dllimport linkage", decl, decl);
else
warning ("%J'%D' redeclared without dllimport attribute "
"after being referenced with dllimport linkage", decl, decl);
XEXP (DECL_RTL (decl), 0) = newrtl;
DECL_NON_ADDR_CONST_P (decl) = 0;
/* We previously set TREE_PUBLIC and DECL_EXTERNAL.
We leave these alone for now. */
}
}
/* Strip only the leading encoding, leaving the stdcall suffix and fastcall
prefix if it exists. */
const char *
i386_pe_strip_name_encoding (const char *str)
{
if (strncmp (str, DLL_IMPORT_PREFIX, strlen (DLL_IMPORT_PREFIX))
== 0)
str += strlen (DLL_IMPORT_PREFIX);
else if (strncmp (str, DLL_EXPORT_PREFIX, strlen (DLL_EXPORT_PREFIX))
== 0)
str += strlen (DLL_EXPORT_PREFIX);
if (*str == '*')
str += 1;
return str;
}
/* Also strip the stdcall suffix. */
const char *
i386_pe_strip_name_encoding_full (const char *str)
{
const char *p;
const char *name = i386_pe_strip_name_encoding (str);
p = strchr (name, '@');
if (p)
return ggc_alloc_string (name, p - name);
return name;
}
/* Output a reference to a label. Fastcall symbols are prefixed with @,
whereas symbols for functions using other calling conventions don't
have a prefix (unless they are marked dllimport or dllexport). */
void i386_pe_output_labelref (FILE *stream, const char *name)
{
if (strncmp (name, DLL_IMPORT_PREFIX, strlen (DLL_IMPORT_PREFIX))
== 0)
/* A dll import */
{
if (name[strlen (DLL_IMPORT_PREFIX)] == FASTCALL_PREFIX)
/* A dllimport fastcall symbol. */
{
fprintf (stream, "__imp_%s",
i386_pe_strip_name_encoding (name));
}
else
/* A dllimport non-fastcall symbol. */
{
fprintf (stream, "__imp__%s",
i386_pe_strip_name_encoding (name));
}
}
else if ((name[0] == FASTCALL_PREFIX)
|| (strncmp (name, DLL_EXPORT_PREFIX, strlen (DLL_EXPORT_PREFIX)
== 0
&& name[strlen (DLL_EXPORT_PREFIX)] == FASTCALL_PREFIX)))
/* A fastcall symbol. */
{
fprintf (stream, "%s",
i386_pe_strip_name_encoding (name));
}
else
/* Everything else. */
{
fprintf (stream, "%s%s", USER_LABEL_PREFIX,
i386_pe_strip_name_encoding (name));
}
}
void
i386_pe_unique_section (tree decl, int reloc)
{
int len;
const char *name, *prefix;
char *string;
name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
name = i386_pe_strip_name_encoding_full (name);
/* The object is put in, for example, section .text$foo.
The linker will then ultimately place them in .text
(everything from the $ on is stripped). Don't put
read-only data in .rdata section to avoid a PE linker
bug when .rdata$* grouped sections are used in code
without a .rdata section. */
if (TREE_CODE (decl) == FUNCTION_DECL)
prefix = ".text$";
else if (decl_readonly_section (decl, reloc))
prefix = ".rdata$";
else
prefix = ".data$";
len = strlen (name) + strlen (prefix);
string = alloca (len + 1);
sprintf (string, "%s%s", prefix, name);
DECL_SECTION_NAME (decl) = build_string (len, string);
}
/* Select a set of attributes for section NAME based on the properties
of DECL and whether or not RELOC indicates that DECL's initializer
might contain runtime relocations.
We make the section read-only and executable for a function decl,
read-only for a const data decl, and writable for a non-const data decl.
If the section has already been defined, to not allow it to have
different attributes, as (1) this is ambiguous since we're not seeing
all the declarations up front and (2) some assemblers (e.g. SVR4)
do not recognize section redefinitions. */
/* ??? This differs from the "standard" PE implementation in that we
handle the SHARED variable attribute. Should this be done for all
PE targets? */
#define SECTION_PE_SHARED SECTION_MACH_DEP
unsigned int
i386_pe_section_type_flags (tree decl, const char *name, int reloc)
{
static htab_t htab;
unsigned int flags;
unsigned int **slot;
/* The names we put in the hashtable will always be the unique
versions gived to us by the stringtable, so we can just use
their addresses as the keys. */
if (!htab)
htab = htab_create (31, htab_hash_pointer, htab_eq_pointer, NULL);
if (decl && TREE_CODE (decl) == FUNCTION_DECL)
flags = SECTION_CODE;
else if (decl && decl_readonly_section (decl, reloc))
flags = 0;
else
{
flags = SECTION_WRITE;
if (decl && TREE_CODE (decl) == VAR_DECL
&& lookup_attribute ("shared", DECL_ATTRIBUTES (decl)))
flags |= SECTION_PE_SHARED;
}
if (decl && DECL_ONE_ONLY (decl))
flags |= SECTION_LINKONCE;
/* See if we already have an entry for this section. */
slot = (unsigned int **) htab_find_slot (htab, name, INSERT);
if (!*slot)
{
*slot = (unsigned int *) xmalloc (sizeof (unsigned int));
**slot = flags;
}
else
{
if (decl && **slot != flags)
error ("%J'%D' causes a section type conflict", decl, decl);
}
return flags;
}
void
i386_pe_asm_named_section (const char *name, unsigned int flags)
{
char flagchars[8], *f = flagchars;
if ((flags & (SECTION_CODE | SECTION_WRITE)) == 0)
/* readonly data */
{
*f++ ='d'; /* This is necessary for older versions of gas. */
*f++ ='r';
}
else
{
if (flags & SECTION_CODE)
*f++ = 'x';
if (flags & SECTION_WRITE)
*f++ = 'w';
if (flags & SECTION_PE_SHARED)
*f++ = 's';
}
*f = '\0';
fprintf (asm_out_file, "\t.section\t%s,\"%s\"\n", name, flagchars);
if (flags & SECTION_LINKONCE)
{
/* Functions may have been compiled at various levels of
optimization so we can't use `same_size' here.
Instead, have the linker pick one. */
fprintf (asm_out_file, "\t.linkonce %s\n",
(flags & SECTION_CODE ? "discard" : "same_size"));
}
}
/* The Microsoft linker requires that every function be marked as
DT_FCN. When using gas on cygwin, we must emit appropriate .type
directives. */
#include "gsyms.h"
/* Mark a function appropriately. This should only be called for
functions for which we are not emitting COFF debugging information.
FILE is the assembler output file, NAME is the name of the
function, and PUBLIC is nonzero if the function is globally
visible. */
void
i386_pe_declare_function_type (FILE *file, const char *name, int public)
{
fprintf (file, "\t.def\t");
assemble_name (file, name);
fprintf (file, ";\t.scl\t%d;\t.type\t%d;\t.endef\n",
public ? (int) C_EXT : (int) C_STAT,
(int) DT_FCN << N_BTSHFT);
}
/* Keep a list of external functions. */
struct extern_list
{
struct extern_list *next;
const char *name;
};
static struct extern_list *extern_head;
/* Assemble an external function reference. We need to keep a list of
these, so that we can output the function types at the end of the
assembly. We can't output the types now, because we might see a
definition of the function later on and emit debugging information
for it then. */
void
i386_pe_record_external_function (const char *name)
{
struct extern_list *p;
p = (struct extern_list *) xmalloc (sizeof *p);
p->next = extern_head;
p->name = name;
extern_head = p;
}
/* Keep a list of exported symbols. */
struct export_list
{
struct export_list *next;
const char *name;
int is_data; /* used to type tag exported symbols. */
};
static struct export_list *export_head;
/* Assemble an export symbol entry. We need to keep a list of
these, so that we can output the export list at the end of the
assembly. We used to output these export symbols in each function,
but that causes problems with GNU ld when the sections are
linkonce. */
void
i386_pe_record_exported_symbol (const char *name, int is_data)
{
struct export_list *p;
p = (struct export_list *) xmalloc (sizeof *p);
p->next = export_head;
p->name = name;
p->is_data = is_data;
export_head = p;
}
/* This is called at the end of assembly. For each external function
which has not been defined, we output a declaration now. We also
output the .drectve section. */
void
i386_pe_file_end (void)
{
struct extern_list *p;
ix86_file_end ();
for (p = extern_head; p != NULL; p = p->next)
{
tree decl;
decl = get_identifier (p->name);
/* Positively ensure only one declaration for any given symbol. */
if (! TREE_ASM_WRITTEN (decl) && TREE_SYMBOL_REFERENCED (decl))
{
TREE_ASM_WRITTEN (decl) = 1;
i386_pe_declare_function_type (asm_out_file, p->name,
TREE_PUBLIC (decl));
}
}
if (export_head)
{
struct export_list *q;
drectve_section ();
for (q = export_head; q != NULL; q = q->next)
{
fprintf (asm_out_file, "\t.ascii \" -export:%s%s\"\n",
i386_pe_strip_name_encoding (q->name),
(q->is_data) ? ",data" : "");
}
}
}
|