This repository has been archived by the owner on Nov 20, 2020. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 84
/
tccgen.c
5122 lines (4875 loc) · 151 KB
/
tccgen.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
/*
* TCC - Tiny C Compiler
*
* Copyright (c) 2001-2004 Fabrice Bellard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
void swap(int *p, int *q)
{
int t;
t = *p;
*p = *q;
*q = t;
}
void vsetc(CType *type, int r, CValue *vc)
{
int v;
if (vtop >= vstack + (VSTACK_SIZE - 1))
error("memory full");
/* cannot let cpu flags if other instruction are generated. Also
avoid leaving VT_JMP anywhere except on the top of the stack
because it would complicate the code generator. */
if (vtop >= vstack) {
v = vtop->r & VT_VALMASK;
if (v == VT_CMP || (v & ~1) == VT_JMP)
gv(RC_INT);
}
vtop++;
vtop->type = *type;
vtop->r = r;
vtop->r2 = VT_CONST;
vtop->c = *vc;
}
/* push integer constant */
void vpushi(int v)
{
CValue cval;
cval.i = v;
vsetc(&int_type, VT_CONST, &cval);
}
/* push long long constant */
void vpushll(long long v)
{
CValue cval;
CType ctype;
ctype.t = VT_LLONG;
cval.ull = v;
vsetc(&ctype, VT_CONST, &cval);
}
/* Return a static symbol pointing to a section */
static Sym *get_sym_ref(CType *type, Section *sec,
unsigned long offset, unsigned long size)
{
int v;
Sym *sym;
v = anon_sym++;
sym = global_identifier_push(v, type->t | VT_STATIC, 0);
sym->type.ref = type->ref;
sym->r = VT_CONST | VT_SYM;
put_extern_sym(sym, sec, offset, size);
return sym;
}
/* push a reference to a section offset by adding a dummy symbol */
static void vpush_ref(CType *type, Section *sec, unsigned long offset, unsigned long size)
{
CValue cval;
cval.ul = 0;
vsetc(type, VT_CONST | VT_SYM, &cval);
vtop->sym = get_sym_ref(type, sec, offset, size);
}
/* define a new external reference to a symbol 'v' of type 'u' */
static Sym *external_global_sym(int v, CType *type, int r)
{
Sym *s;
s = sym_find(v);
if (!s) {
/* push forward reference */
s = global_identifier_push(v, type->t | VT_EXTERN, 0);
s->type.ref = type->ref;
s->r = r | VT_CONST | VT_SYM;
}
return s;
}
/* define a new external reference to a symbol 'v' of type 'u' */
static Sym *external_sym(int v, CType *type, int r)
{
Sym *s;
s = sym_find(v);
if (!s) {
/* push forward reference */
s = sym_push(v, type, r | VT_CONST | VT_SYM, 0);
s->type.t |= VT_EXTERN;
} else {
if (!is_compatible_types(&s->type, type))
error("incompatible types for redefinition of '%s'",
get_tok_str(v, NULL));
}
return s;
}
/* push a reference to global symbol v */
static void vpush_global_sym(CType *type, int v)
{
Sym *sym;
CValue cval;
sym = external_global_sym(v, type, 0);
cval.ul = 0;
vsetc(type, VT_CONST | VT_SYM, &cval);
vtop->sym = sym;
}
void vset(CType *type, int r, int v)
{
CValue cval;
cval.i = v;
vsetc(type, r, &cval);
}
void vseti(int r, int v)
{
CType type;
type.t = VT_INT;
vset(&type, r, v);
}
void vswap(void)
{
SValue tmp;
tmp = vtop[0];
vtop[0] = vtop[-1];
vtop[-1] = tmp;
}
void vpushv(SValue *v)
{
if (vtop >= vstack + (VSTACK_SIZE - 1))
error("memory full");
vtop++;
*vtop = *v;
}
void vdup(void)
{
vpushv(vtop);
}
/* save r to the memory stack, and mark it as being free */
void save_reg(int r)
{
int l, saved, size, align;
SValue *p, sv;
CType *type;
/* modify all stack values */
saved = 0;
l = 0;
for(p=vstack;p<=vtop;p++) {
if ((p->r & VT_VALMASK) == r ||
((p->type.t & VT_BTYPE) == VT_LLONG && (p->r2 & VT_VALMASK) == r)) {
/* must save value on stack if not already done */
if (!saved) {
/* NOTE: must reload 'r' because r might be equal to r2 */
r = p->r & VT_VALMASK;
/* store register in the stack */
type = &p->type;
if ((p->r & VT_LVAL) ||
(!is_float(type->t) && (type->t & VT_BTYPE) != VT_LLONG))
#ifdef TCC_TARGET_X86_64
type = &char_pointer_type;
#else
type = &int_type;
#endif
size = type_size(type, &align);
loc = (loc - size) & -align;
sv.type.t = type->t;
sv.r = VT_LOCAL | VT_LVAL;
sv.c.ul = loc;
store(r, &sv);
#if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
/* x86 specific: need to pop fp register ST0 if saved */
if (r == TREG_ST0) {
o(0xd9dd); /* fstp %st(1) */
}
#endif
#ifndef TCC_TARGET_X86_64
/* special long long case */
if ((type->t & VT_BTYPE) == VT_LLONG) {
sv.c.ul += 4;
store(p->r2, &sv);
}
#endif
l = loc;
saved = 1;
}
/* mark that stack entry as being saved on the stack */
if (p->r & VT_LVAL) {
/* also clear the bounded flag because the
relocation address of the function was stored in
p->c.ul */
p->r = (p->r & ~(VT_VALMASK | VT_BOUNDED)) | VT_LLOCAL;
} else {
p->r = lvalue_type(p->type.t) | VT_LOCAL;
}
p->r2 = VT_CONST;
p->c.ul = l;
}
}
}
/* find a register of class 'rc2' with at most one reference on stack.
* If none, call get_reg(rc) */
int get_reg_ex(int rc, int rc2)
{
int r;
SValue *p;
for(r=0;r<NB_REGS;r++) {
if (reg_classes[r] & rc2) {
int n;
n=0;
for(p = vstack; p <= vtop; p++) {
if ((p->r & VT_VALMASK) == r ||
(p->r2 & VT_VALMASK) == r)
n++;
}
if (n <= 1)
return r;
}
}
return get_reg(rc);
}
/* find a free register of class 'rc'. If none, save one register */
int get_reg(int rc)
{
int r;
SValue *p;
/* find a free register */
for(r=0;r<NB_REGS;r++) {
if (reg_classes[r] & rc) {
for(p=vstack;p<=vtop;p++) {
if ((p->r & VT_VALMASK) == r ||
(p->r2 & VT_VALMASK) == r)
goto notfound;
}
return r;
}
notfound: ;
}
/* no register left : free the first one on the stack (VERY
IMPORTANT to start from the bottom to ensure that we don't
spill registers used in gen_opi()) */
for(p=vstack;p<=vtop;p++) {
r = p->r & VT_VALMASK;
if (r < VT_CONST && (reg_classes[r] & rc))
goto save_found;
/* also look at second register (if long long) */
r = p->r2 & VT_VALMASK;
if (r < VT_CONST && (reg_classes[r] & rc)) {
save_found:
save_reg(r);
return r;
}
}
/* Should never comes here */
return -1;
}
/* save registers up to (vtop - n) stack entry */
void save_regs(int n)
{
int r;
SValue *p, *p1;
p1 = vtop - n;
for(p = vstack;p <= p1; p++) {
r = p->r & VT_VALMASK;
if (r < VT_CONST) {
save_reg(r);
}
}
}
/* move register 's' to 'r', and flush previous value of r to memory
if needed */
void move_reg(int r, int s)
{
SValue sv;
if (r != s) {
save_reg(r);
sv.type.t = VT_INT;
sv.r = s;
sv.c.ul = 0;
load(r, &sv);
}
}
/* get address of vtop (vtop MUST BE an lvalue) */
void gaddrof(void)
{
vtop->r &= ~VT_LVAL;
/* tricky: if saved lvalue, then we can go back to lvalue */
if ((vtop->r & VT_VALMASK) == VT_LLOCAL)
vtop->r = (vtop->r & ~(VT_VALMASK | VT_LVAL_TYPE)) | VT_LOCAL | VT_LVAL;
}
#ifdef CONFIG_TCC_BCHECK
/* generate lvalue bound code */
void gbound(void)
{
int lval_type;
CType type1;
vtop->r &= ~VT_MUSTBOUND;
/* if lvalue, then use checking code before dereferencing */
if (vtop->r & VT_LVAL) {
/* if not VT_BOUNDED value, then make one */
if (!(vtop->r & VT_BOUNDED)) {
lval_type = vtop->r & (VT_LVAL_TYPE | VT_LVAL);
/* must save type because we must set it to int to get pointer */
type1 = vtop->type;
vtop->type.t = VT_INT;
gaddrof();
vpushi(0);
gen_bounded_ptr_add();
vtop->r |= lval_type;
vtop->type = type1;
}
/* then check for dereferencing */
gen_bounded_ptr_deref();
}
}
#endif
/* store vtop a register belonging to class 'rc'. lvalues are
converted to values. Cannot be used if cannot be converted to
register value (such as structures). */
int gv(int rc)
{
int r, rc2, bit_pos, bit_size, size, align, i;
/* NOTE: get_reg can modify vstack[] */
if (vtop->type.t & VT_BITFIELD) {
CType type;
int bits = 32;
bit_pos = (vtop->type.t >> VT_STRUCT_SHIFT) & 0x3f;
bit_size = (vtop->type.t >> (VT_STRUCT_SHIFT + 6)) & 0x3f;
/* remove bit field info to avoid loops */
vtop->type.t &= ~(VT_BITFIELD | (-1 << VT_STRUCT_SHIFT));
/* cast to int to propagate signedness in following ops */
if ((vtop->type.t & VT_BTYPE) == VT_LLONG) {
type.t = VT_LLONG;
bits = 64;
} else
type.t = VT_INT;
if((vtop->type.t & VT_UNSIGNED) ||
(vtop->type.t & VT_BTYPE) == VT_BOOL)
type.t |= VT_UNSIGNED;
gen_cast(&type);
/* generate shifts */
vpushi(bits - (bit_pos + bit_size));
gen_op(TOK_SHL);
vpushi(bits - bit_size);
/* NOTE: transformed to SHR if unsigned */
gen_op(TOK_SAR);
r = gv(rc);
} else {
if (is_float(vtop->type.t) &&
(vtop->r & (VT_VALMASK | VT_LVAL)) == VT_CONST) {
Sym *sym;
int *ptr;
unsigned long offset;
#if defined(TCC_TARGET_ARM) && !defined(TCC_ARM_VFP)
CValue check;
#endif
/* XXX: unify with initializers handling ? */
/* CPUs usually cannot use float constants, so we store them
generically in data segment */
size = type_size(&vtop->type, &align);
offset = (data_section->data_offset + align - 1) & -align;
data_section->data_offset = offset;
/* XXX: not portable yet */
#if defined(__i386__) || defined(__x86_64__)
/* Zero pad x87 tenbyte long doubles */
if (size == LDOUBLE_SIZE)
vtop->c.tab[2] &= 0xffff;
#endif
ptr = section_ptr_add(data_section, size);
size = size >> 2;
#if defined(TCC_TARGET_ARM) && !defined(TCC_ARM_VFP)
check.d = 1;
if(check.tab[0])
for(i=0;i<size;i++)
ptr[i] = vtop->c.tab[size-1-i];
else
#endif
for(i=0;i<size;i++)
ptr[i] = vtop->c.tab[i];
sym = get_sym_ref(&vtop->type, data_section, offset, size << 2);
vtop->r |= VT_LVAL | VT_SYM;
vtop->sym = sym;
vtop->c.ul = 0;
}
#ifdef CONFIG_TCC_BCHECK
if (vtop->r & VT_MUSTBOUND)
gbound();
#endif
r = vtop->r & VT_VALMASK;
rc2 = RC_INT;
if (rc == RC_IRET)
rc2 = RC_LRET;
/* need to reload if:
- constant
- lvalue (need to dereference pointer)
- already a register, but not in the right class */
if (r >= VT_CONST ||
(vtop->r & VT_LVAL) ||
!(reg_classes[r] & rc) ||
((vtop->type.t & VT_BTYPE) == VT_LLONG &&
!(reg_classes[vtop->r2] & rc2))) {
r = get_reg(rc);
#ifndef TCC_TARGET_X86_64
if ((vtop->type.t & VT_BTYPE) == VT_LLONG) {
int r2;
unsigned long long ll;
/* two register type load : expand to two words
temporarily */
if ((vtop->r & (VT_VALMASK | VT_LVAL)) == VT_CONST) {
/* load constant */
ll = vtop->c.ull;
vtop->c.ui = ll; /* first word */
load(r, vtop);
vtop->r = r; /* save register value */
vpushi(ll >> 32); /* second word */
} else if (r >= VT_CONST || /* XXX: test to VT_CONST incorrect ? */
(vtop->r & VT_LVAL)) {
/* We do not want to modifier the long long
pointer here, so the safest (and less
efficient) is to save all the other registers
in the stack. XXX: totally inefficient. */
save_regs(1);
/* load from memory */
load(r, vtop);
vdup();
vtop[-1].r = r; /* save register value */
/* increment pointer to get second word */
vtop->type.t = VT_INT;
gaddrof();
vpushi(4);
gen_op('+');
vtop->r |= VT_LVAL;
} else {
/* move registers */
load(r, vtop);
vdup();
vtop[-1].r = r; /* save register value */
vtop->r = vtop[-1].r2;
}
/* allocate second register */
r2 = get_reg(rc2);
load(r2, vtop);
vpop();
/* write second register */
vtop->r2 = r2;
} else
#endif
if ((vtop->r & VT_LVAL) && !is_float(vtop->type.t)) {
int t1, t;
/* lvalue of scalar type : need to use lvalue type
because of possible cast */
t = vtop->type.t;
t1 = t;
/* compute memory access type */
if (vtop->r & VT_LVAL_BYTE)
t = VT_BYTE;
else if (vtop->r & VT_LVAL_SHORT)
t = VT_SHORT;
if (vtop->r & VT_LVAL_UNSIGNED)
t |= VT_UNSIGNED;
vtop->type.t = t;
load(r, vtop);
/* restore wanted type */
vtop->type.t = t1;
} else {
/* one register type load */
load(r, vtop);
}
}
vtop->r = r;
#ifdef TCC_TARGET_C67
/* uses register pairs for doubles */
if ((vtop->type.t & VT_BTYPE) == VT_DOUBLE)
vtop->r2 = r+1;
#endif
}
return r;
}
/* generate vtop[-1] and vtop[0] in resp. classes rc1 and rc2 */
void gv2(int rc1, int rc2)
{
int v;
/* generate more generic register first. But VT_JMP or VT_CMP
values must be generated first in all cases to avoid possible
reload errors */
v = vtop[0].r & VT_VALMASK;
if (v != VT_CMP && (v & ~1) != VT_JMP && rc1 <= rc2) {
vswap();
gv(rc1);
vswap();
gv(rc2);
/* test if reload is needed for first register */
if ((vtop[-1].r & VT_VALMASK) >= VT_CONST) {
vswap();
gv(rc1);
vswap();
}
} else {
gv(rc2);
vswap();
gv(rc1);
vswap();
/* test if reload is needed for first register */
if ((vtop[0].r & VT_VALMASK) >= VT_CONST) {
gv(rc2);
}
}
}
/* wrapper around RC_FRET to return a register by type */
int rc_fret(int t)
{
#ifdef TCC_TARGET_X86_64
if (t == VT_LDOUBLE) {
return RC_ST0;
}
#endif
return RC_FRET;
}
/* wrapper around REG_FRET to return a register by type */
int reg_fret(int t)
{
#ifdef TCC_TARGET_X86_64
if (t == VT_LDOUBLE) {
return TREG_ST0;
}
#endif
return REG_FRET;
}
/* expand long long on stack in two int registers */
void lexpand(void)
{
int u;
u = vtop->type.t & VT_UNSIGNED;
gv(RC_INT);
vdup();
vtop[0].r = vtop[-1].r2;
vtop[0].r2 = VT_CONST;
vtop[-1].r2 = VT_CONST;
vtop[0].type.t = VT_INT | u;
vtop[-1].type.t = VT_INT | u;
}
#ifdef TCC_TARGET_ARM
/* expand long long on stack */
void lexpand_nr(void)
{
int u,v;
u = vtop->type.t & VT_UNSIGNED;
vdup();
vtop->r2 = VT_CONST;
vtop->type.t = VT_INT | u;
v=vtop[-1].r & (VT_VALMASK | VT_LVAL);
if (v == VT_CONST) {
vtop[-1].c.ui = vtop->c.ull;
vtop->c.ui = vtop->c.ull >> 32;
vtop->r = VT_CONST;
} else if (v == (VT_LVAL|VT_CONST) || v == (VT_LVAL|VT_LOCAL)) {
vtop->c.ui += 4;
vtop->r = vtop[-1].r;
} else if (v > VT_CONST) {
vtop--;
lexpand();
} else
vtop->r = vtop[-1].r2;
vtop[-1].r2 = VT_CONST;
vtop[-1].type.t = VT_INT | u;
}
#endif
/* build a long long from two ints */
void lbuild(int t)
{
gv2(RC_INT, RC_INT);
vtop[-1].r2 = vtop[0].r;
vtop[-1].type.t = t;
vpop();
}
/* rotate n first stack elements to the bottom
I1 ... In -> I2 ... In I1 [top is right]
*/
void vrotb(int n)
{
int i;
SValue tmp;
tmp = vtop[-n + 1];
for(i=-n+1;i!=0;i++)
vtop[i] = vtop[i+1];
vtop[0] = tmp;
}
/* rotate n first stack elements to the top
I1 ... In -> In I1 ... I(n-1) [top is right]
*/
void vrott(int n)
{
int i;
SValue tmp;
tmp = vtop[0];
for(i = 0;i < n - 1; i++)
vtop[-i] = vtop[-i - 1];
vtop[-n + 1] = tmp;
}
#ifdef TCC_TARGET_ARM
/* like vrott but in other direction
In ... I1 -> I(n-1) ... I1 In [top is right]
*/
void vnrott(int n)
{
int i;
SValue tmp;
tmp = vtop[-n + 1];
for(i = n - 1; i > 0; i--)
vtop[-i] = vtop[-i + 1];
vtop[0] = tmp;
}
#endif
/* pop stack value */
void vpop(void)
{
int v;
v = vtop->r & VT_VALMASK;
#if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
/* for x86, we need to pop the FP stack */
if (v == TREG_ST0 && !nocode_wanted) {
o(0xd9dd); /* fstp %st(1) */
} else
#endif
if (v == VT_JMP || v == VT_JMPI) {
/* need to put correct jump if && or || without test */
gsym(vtop->c.ul);
}
vtop--;
}
/* convert stack entry to register and duplicate its value in another
register */
void gv_dup(void)
{
int rc, t, r, r1;
SValue sv;
t = vtop->type.t;
if ((t & VT_BTYPE) == VT_LLONG) {
lexpand();
gv_dup();
vswap();
vrotb(3);
gv_dup();
vrotb(4);
/* stack: H L L1 H1 */
lbuild(t);
vrotb(3);
vrotb(3);
vswap();
lbuild(t);
vswap();
} else {
/* duplicate value */
rc = RC_INT;
sv.type.t = VT_INT;
if (is_float(t)) {
rc = RC_FLOAT;
#ifdef TCC_TARGET_X86_64
if ((t & VT_BTYPE) == VT_LDOUBLE) {
rc = RC_ST0;
}
#endif
sv.type.t = t;
}
r = gv(rc);
r1 = get_reg(rc);
sv.r = r;
sv.c.ul = 0;
load(r1, &sv); /* move r to r1 */
vdup();
/* duplicates value */
vtop->r = r1;
}
}
#ifndef TCC_TARGET_X86_64
/* generate CPU independent (unsigned) long long operations */
void gen_opl(int op)
{
int t, a, b, op1, c, i;
int func;
unsigned short reg_iret = REG_IRET;
unsigned short reg_lret = REG_LRET;
SValue tmp;
switch(op) {
case '/':
case TOK_PDIV:
func = TOK___divdi3;
goto gen_func;
case TOK_UDIV:
func = TOK___udivdi3;
goto gen_func;
case '%':
func = TOK___moddi3;
goto gen_mod_func;
case TOK_UMOD:
func = TOK___umoddi3;
gen_mod_func:
#ifdef TCC_ARM_EABI
reg_iret = TREG_R2;
reg_lret = TREG_R3;
#endif
gen_func:
/* call generic long long function */
vpush_global_sym(&func_old_type, func);
vrott(3);
gfunc_call(2);
vpushi(0);
vtop->r = reg_iret;
vtop->r2 = reg_lret;
break;
case '^':
case '&':
case '|':
case '*':
case '+':
case '-':
t = vtop->type.t;
vswap();
lexpand();
vrotb(3);
lexpand();
/* stack: L1 H1 L2 H2 */
tmp = vtop[0];
vtop[0] = vtop[-3];
vtop[-3] = tmp;
tmp = vtop[-2];
vtop[-2] = vtop[-3];
vtop[-3] = tmp;
vswap();
/* stack: H1 H2 L1 L2 */
if (op == '*') {
vpushv(vtop - 1);
vpushv(vtop - 1);
gen_op(TOK_UMULL);
lexpand();
/* stack: H1 H2 L1 L2 ML MH */
for(i=0;i<4;i++)
vrotb(6);
/* stack: ML MH H1 H2 L1 L2 */
tmp = vtop[0];
vtop[0] = vtop[-2];
vtop[-2] = tmp;
/* stack: ML MH H1 L2 H2 L1 */
gen_op('*');
vrotb(3);
vrotb(3);
gen_op('*');
/* stack: ML MH M1 M2 */
gen_op('+');
gen_op('+');
} else if (op == '+' || op == '-') {
/* XXX: add non carry method too (for MIPS or alpha) */
if (op == '+')
op1 = TOK_ADDC1;
else
op1 = TOK_SUBC1;
gen_op(op1);
/* stack: H1 H2 (L1 op L2) */
vrotb(3);
vrotb(3);
gen_op(op1 + 1); /* TOK_xxxC2 */
} else {
gen_op(op);
/* stack: H1 H2 (L1 op L2) */
vrotb(3);
vrotb(3);
/* stack: (L1 op L2) H1 H2 */
gen_op(op);
/* stack: (L1 op L2) (H1 op H2) */
}
/* stack: L H */
lbuild(t);
break;
case TOK_SAR:
case TOK_SHR:
case TOK_SHL:
if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
t = vtop[-1].type.t;
vswap();
lexpand();
vrotb(3);
/* stack: L H shift */
c = (int)vtop->c.i;
/* constant: simpler */
/* NOTE: all comments are for SHL. the other cases are
done by swaping words */
vpop();
if (op != TOK_SHL)
vswap();
if (c >= 32) {
/* stack: L H */
vpop();
if (c > 32) {
vpushi(c - 32);
gen_op(op);
}
if (op != TOK_SAR) {
vpushi(0);
} else {
gv_dup();
vpushi(31);
gen_op(TOK_SAR);
}
vswap();
} else {
vswap();
gv_dup();
/* stack: H L L */
vpushi(c);
gen_op(op);
vswap();
vpushi(32 - c);
if (op == TOK_SHL)
gen_op(TOK_SHR);
else
gen_op(TOK_SHL);
vrotb(3);
/* stack: L L H */
vpushi(c);
if (op == TOK_SHL)
gen_op(TOK_SHL);
else
gen_op(TOK_SHR);
gen_op('|');
}
if (op != TOK_SHL)
vswap();
lbuild(t);
} else {
/* XXX: should provide a faster fallback on x86 ? */
switch(op) {
case TOK_SAR:
func = TOK___ashrdi3;
goto gen_func;
case TOK_SHR:
func = TOK___lshrdi3;
goto gen_func;
case TOK_SHL:
func = TOK___ashldi3;
goto gen_func;
}
}
break;
default:
/* compare operations */
t = vtop->type.t;
vswap();
lexpand();
vrotb(3);
lexpand();
/* stack: L1 H1 L2 H2 */
tmp = vtop[-1];
vtop[-1] = vtop[-2];
vtop[-2] = tmp;
/* stack: L1 L2 H1 H2 */
/* compare high */
op1 = op;
/* when values are equal, we need to compare low words. since
the jump is inverted, we invert the test too. */
if (op1 == TOK_LT)
op1 = TOK_LE;
else if (op1 == TOK_GT)
op1 = TOK_GE;
else if (op1 == TOK_ULT)
op1 = TOK_ULE;
else if (op1 == TOK_UGT)
op1 = TOK_UGE;
a = 0;
b = 0;
gen_op(op1);
if (op1 != TOK_NE) {
a = gtst(1, 0);
}
if (op != TOK_EQ) {
/* generate non equal test */
/* XXX: NOT PORTABLE yet */
if (a == 0) {
b = gtst(0, 0);
} else {
#if defined(TCC_TARGET_I386)
b = psym(0x850f, 0);
#elif defined(TCC_TARGET_ARM)
b = ind;
o(0x1A000000 | encbranch(ind, 0, 1));
#elif defined(TCC_TARGET_C67)
error("not implemented");
#else
#error not supported
#endif
}
}
/* compare low. Always unsigned */
op1 = op;
if (op1 == TOK_LT)
op1 = TOK_ULT;
else if (op1 == TOK_LE)
op1 = TOK_ULE;
else if (op1 == TOK_GT)
op1 = TOK_UGT;
else if (op1 == TOK_GE)
op1 = TOK_UGE;
gen_op(op1);
a = gtst(1, a);
gsym(b);
vseti(VT_JMPI, a);
break;
}
}
#endif
/* handle integer constant optimizations and various machine
independent opt */
void gen_opic(int op)
{
int c1, c2, t1, t2, n;
SValue *v1, *v2;
long long l1, l2;
typedef unsigned long long U;
v1 = vtop - 1;
v2 = vtop;
t1 = v1->type.t & VT_BTYPE;
t2 = v2->type.t & VT_BTYPE;
if (t1 == VT_LLONG)
l1 = v1->c.ll;
else if (v1->type.t & VT_UNSIGNED)
l1 = v1->c.ui;
else