forked from dlang/dmd
-
Notifications
You must be signed in to change notification settings - Fork 0
/
cgcod.c
2664 lines (2414 loc) · 62.2 KB
/
cgcod.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
// Copyright (C) 1985-1998 by Symantec
// Copyright (C) 2000-2009 by Digital Mars
// All Rights Reserved
// http://www.digitalmars.com
// Written by Walter Bright
/*
* This source file is made available for personal use
* only. The license is in /dmd/src/dmd/backendlicense.txt
* For any other uses, please contact Digital Mars.
*/
#if !SPP
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>
#include "cc.h"
#include "el.h"
#include "oper.h"
#include "code.h"
#include "global.h"
#include "type.h"
#include "exh.h"
static char __file__[] = __FILE__; /* for tassert.h */
#include "tassert.h"
STATIC void resetEcomsub(elem *e);
STATIC code * loadcse(elem *,unsigned,regm_t);
STATIC void blcodgen(block *);
STATIC void cgcod_eh();
STATIC int numbitsset(regm_t);
STATIC code * cse_save(regm_t ms);
STATIC int cse_simple(elem *e,int i);
STATIC code * comsub(elem *,regm_t *);
bool floatreg; // !=0 if floating register is required
targ_size_t Aoffset; // offset of automatics and registers
targ_size_t Toffset; // offset of temporaries
targ_size_t EEoffset; // offset of SCstack variables from ESP
int Aalign; // alignment for Aoffset
CGstate cgstate; // state of code generator
/************************************
* # of bytes that SP is beyond BP.
*/
unsigned stackpush;
int stackchanged; /* set to !=0 if any use of the stack
other than accessing parameters. Used
to see if we can address parameters
with ESP rather than EBP.
*/
int refparam; // !=0 if we referenced any parameters
int reflocal; // !=0 if we referenced any locals
char anyiasm; // !=0 if any inline assembler
char calledafunc; // !=0 if we called a function
char needframe; // if TRUE, then we will need the frame
// pointer (BP for the 8088)
char usedalloca; // if TRUE, then alloca() was called
char gotref; // !=0 if the GOTsym was referenced
unsigned usednteh; // if !=0, then used NT exception handling
/* Register contents */
con_t regcon;
int pass; // PASSxxxx
static symbol *retsym; // set to symbol that should be placed in
// register AX
/****************************
* Register masks.
*/
regm_t msavereg; // Mask of registers that we would like to save.
// they are temporaries (set by scodelem())
regm_t mfuncreg; // Mask of registers preserved by a function
regm_t allregs; // ALLREGS optionally including mBP
int dfoidx; /* which block we are in */
struct CSE *csextab = NULL; /* CSE table (allocated for each function) */
unsigned cstop; /* # of entries in CSE table (csextab[]) */
unsigned csmax; /* amount of space in csextab[] */
targ_size_t funcoffset; // offset of start of function
targ_size_t startoffset; // size of function entry code
targ_size_t retoffset; /* offset from start of func to ret code */
targ_size_t retsize; /* size of function return */
static regm_t lastretregs,last2retregs,last3retregs,last4retregs,last5retregs;
/*********************************
* Generate code for a function.
* Note at the end of this routine mfuncreg will contain the mask
* of registers not affected by the function. Some minor optimization
* possibilities are here...
*/
void codgen()
{ block *b,*bn;
bool flag;
int i;
targ_size_t swoffset,coffset;
tym_t functy;
unsigned nretblocks; // number of return blocks
code *cprolog;
regm_t noparams;
#if SCPP
block *btry;
#endif
// Register usage. If a bit is on, the corresponding register is live
// in that basic block.
//printf("codgen('%s')\n",funcsym_p->Sident);
cgreg_init();
csmax = 64;
csextab = (struct CSE *) util_calloc(sizeof(struct CSE),csmax);
functy = tybasic(funcsym_p->ty());
#if TARGET_LINUX || TARGET_OSX
if (0 && config.flags3 & CFG3pic)
{
ALLREGS = ALLREGS_INIT_PIC;
BYTEREGS = BYTEREGS_INIT_PIC;
}
else
{
regm_t value = BYTEREGS_INIT;
ALLREGS = ALLREGS_INIT;
BYTEREGS = value;
}
#endif
allregs = ALLREGS;
if (0 && config.flags3 & CFG3pic)
allregs &= ~mBX;
pass = PASSinit;
tryagain:
#ifdef DEBUG
if (debugr)
printf("------------------ PASS%s -----------------\n",
(pass == PASSinit) ? "init" : ((pass == PASSreg) ? "reg" : "final"));
#endif
lastretregs = last2retregs = last3retregs = last4retregs = last5retregs = 0;
// if no parameters, assume we don't need a stack frame
needframe = 0;
usedalloca = 0;
gotref = 0;
stackchanged = 0;
stackpush = 0;
refparam = 0;
anyiasm = 0;
calledafunc = 0;
cgstate.stackclean = 1;
retsym = NULL;
memset(_8087elems,0,sizeof(_8087elems));
usednteh = 0;
#if (MARS) && TARGET_WINDOS
if (funcsym_p->Sfunc->Fflags3 & Fjmonitor)
usednteh |= NTEHjmonitor;
#else
if (CPP)
{
if (config.flags2 & CFG2seh &&
(funcsym_p->Stype->Tflags & TFemptyexc || funcsym_p->Stype->Texcspec))
usednteh |= NTEHexcspec;
except_reset();
}
#endif
floatreg = FALSE;
assert(stackused == 0); /* nobody in 8087 stack */
cstop = 0; /* no entries in table yet */
memset(®con,0,sizeof(regcon));
regcon.cse.mval = regcon.cse.mops = 0; // no common subs yet
#if 0 && TARGET_LINUX
if (!(allregs & mBX))
msavereg = mBX;
else
#endif
msavereg = 0;
nretblocks = 0;
mfuncreg = fregsaved;
// mfuncreg = mBP|mES|ALLREGS; // so we can see which are used
// (bit is cleared each time
// we use one)
for (b = startblock; b; b = b->Bnext)
{ memset(&b->Bregcon,0,sizeof(b->Bregcon)); // Clear out values in registers
if (b->Belem)
resetEcomsub(b->Belem); // reset all the Ecomsubs
if (b->BC == BCasm)
anyiasm = 1; // we have inline assembler
if (b->BC == BCret || b->BC == BCretexp)
nretblocks++;
}
if (!config.fulltypes || (config.flags4 & CFG4optimized))
{
noparams = 0;
for (i = 0; i < globsym.top; i++)
{
Symbol *s = globsym.tab[i];
s->Sflags &= ~SFLread;
switch (s->Sclass)
{ case SCfastpar:
regcon.params |= mask[s->Spreg];
case SCparameter:
if (s->Sfl == FLreg)
noparams |= s->Sregm;
break;
}
}
regcon.params &= ~noparams;
}
if (config.flags4 & CFG4optimized)
{
if (nretblocks == 0) // if no return blocks in function
funcsym_p->Sflags |= SFLexit; // mark function as never returning
assert(dfo);
cgreg_reset();
for (dfoidx = 0; dfoidx < dfotop; dfoidx++)
{ regcon.used = msavereg | regcon.cse.mval; // registers already in use
b = dfo[dfoidx];
blcodgen(b); // gen code in depth-first order
//printf("b->Bregcon.used = x%x\n", b->Bregcon.used);
cgreg_used(dfoidx,b->Bregcon.used); // gather register used information
}
}
else
{ pass = PASSfinal;
for (b = startblock; b; b = b->Bnext)
blcodgen(b); // generate the code for each block
}
regcon.immed.mval = 0;
assert(!regcon.cse.mops); // should have all been used
// See which variables we can put into registers
if (pass != PASSfinal &&
!anyiasm) // possible LEA or LES opcodes
{
allregs |= cod3_useBP(); // see if we can use EBP
// If pic code, but EBX was never needed
if (!(allregs & mBX) && !gotref)
{ allregs |= mBX; // EBX can now be used
cgreg_assign(retsym);
pass = PASSreg;
}
else if (cgreg_assign(retsym)) // if we found some registers
pass = PASSreg;
else
pass = PASSfinal;
for (b = startblock; b; b = b->Bnext)
{ code_free(b->Bcode);
b->Bcode = NULL;
}
goto tryagain;
}
cgreg_term();
#if SCPP
if (CPP)
cgcod_eh();
#endif
stackoffsets(1); // compute addresses of stack variables
cod5_prol_epi(); // see where to place prolog/epilog
// Get rid of unused cse temporaries
while (cstop != 0 && (csextab[cstop - 1].flags & CSEload) == 0)
cstop--;
if (configv.addlinenumbers)
objlinnum(funcsym_p->Sfunc->Fstartline,Coffset);
// Otherwise, jmp's to startblock will execute the prolog again
assert(!startblock->Bpred);
cprolog = prolog(); // gen function start code
if (cprolog)
pinholeopt(cprolog,NULL); // optimize
funcoffset = Coffset;
coffset = Coffset;
if (eecontext.EEelem)
{ regm_t retregs;
code *c;
eecontext.EEin++;
regcon.immed.mval = 0;
retregs = 0; //regmask(eecontext.EEelem->Ety);
assert(EEoffset >= REGSIZE);
c = genc2(NULL,0x81,modregrm(3,5,SP),EEoffset - REGSIZE); // SUB ESP,EEoffset
gen1(c,0x50 + SI); // PUSH ESI
genadjesp(c,EEoffset);
c = gencodelem(c,eecontext.EEelem,&retregs, FALSE);
assignaddrc(c);
pinholeopt(c,NULL);
jmpaddr(c);
eecontext.EEcode = gen1(c,0xCC); // INT 3
eecontext.EEin--;
}
for (b = startblock; b; b = b->Bnext)
{
// We couldn't do this before because localsize was unknown
switch (b->BC)
{ case BCret:
if (configv.addlinenumbers && b->Bsrcpos.Slinnum && !(funcsym_p->ty() & mTYnaked))
cgen_linnum(&b->Bcode,b->Bsrcpos);
case BCretexp:
epilog(b);
break;
default:
if (b->Bflags & BFLepilog)
epilog(b);
break;
}
assignaddr(b); // assign addresses
pinholeopt(b->Bcode,b); // do pinhole optimization
if (b->Bflags & BFLprolog) // do function prolog
{
startoffset = coffset + calcblksize(cprolog) - funcoffset;
b->Bcode = cat(cprolog,b->Bcode);
}
if (config.flags4 & CFG4speed &&
config.target_cpu >= TARGET_Pentium &&
b->BC != BCasm
)
{ regm_t scratch;
scratch = allregs & ~(b->Bregcon.used | b->Bregcon.params | mfuncreg);
scratch &= ~(b->Bregcon.immed.mval | b->Bregcon.cse.mval);
cgsched_pentium(&b->Bcode,scratch);
//printf("after schedule:\n"); WRcodlst(b->Bcode);
}
b->Bsize = calcblksize(b->Bcode); // calculate block size
if (b->Balign)
{ targ_size_t u = b->Balign - 1;
coffset = (coffset + u) & ~u;
}
b->Boffset = coffset; /* offset of this block */
coffset += b->Bsize; /* offset of following block */
}
#ifdef DEBUG
debugw && printf("code addr complete\n");
#endif
// Do jump optimization
do
{ flag = FALSE;
for (b = startblock; b; b = b->Bnext)
{ if (b->Bflags & BFLjmpoptdone) /* if no more jmp opts for this blk */
continue;
i = branch(b,0); // see if jmp => jmp short
if (i) /* if any bytes saved */
{ targ_size_t offset;
b->Bsize -= i;
offset = b->Boffset + b->Bsize;
for (bn = b->Bnext; bn; bn = bn->Bnext)
{
if (bn->Balign)
{ targ_size_t u = bn->Balign - 1;
offset = (offset + u) & ~u;
}
bn->Boffset = offset;
offset += bn->Bsize;
}
coffset = offset;
flag = TRUE;
}
}
if (I32 && !(config.flags4 & CFG4optimized))
break; // use the long conditional jmps
} while (flag); // loop till no more bytes saved
#ifdef DEBUG
debugw && printf("code jump optimization complete\n");
#endif
// Compute starting offset for switch tables
#if ELFOBJ || MACHOBJ
swoffset = (config.flags & CFGromable) ? coffset : CDoffset;
#else
swoffset = (config.flags & CFGromable) ? coffset : Doffset;
#endif
swoffset = align(0,swoffset);
// Emit the generated code
if (eecontext.EEcompile == 1)
{
codout(eecontext.EEcode);
code_free(eecontext.EEcode);
#if SCPP
el_free(eecontext.EEelem);
#endif
}
else
{
for (b = startblock; b; b = b->Bnext)
{
if (b->BC == BCjmptab || b->BC == BCswitch)
{ b->Btableoffset = swoffset; /* offset of sw tab */
swoffset += b->Btablesize;
}
jmpaddr(b->Bcode); /* assign jump addresses */
#ifdef DEBUG
if (debugc)
{ printf("Boffset = x%lx, Bsize = x%lx, Coffset = x%lx\n",
(long)b->Boffset,(long)b->Bsize,(long)Coffset);
if (b->Bcode)
printf( "First opcode of block is: %0x\n", b->Bcode->Iop );
}
#endif
if (b->Balign)
{ unsigned u = b->Balign;
unsigned nalign = (u - (unsigned)Coffset) & (u - 1);
while (nalign--)
obj_byte(cseg,Coffset++,0x90); // XCHG AX,AX
}
assert(b->Boffset == Coffset);
#if SCPP
if (CPP &&
!(config.flags2 & CFG2seh))
{
//printf("b = %p, index = %d\n",b,b->Bindex);
//except_index_set(b->Bindex);
if (btry != b->Btry)
{
btry = b->Btry;
except_pair_setoffset(b,Coffset - funcoffset);
}
if (b->BC == BCtry)
{
btry = b;
except_pair_setoffset(b,Coffset - funcoffset);
}
}
#endif
codout(b->Bcode); // output code
}
if (coffset != Coffset)
{
#ifdef DEBUG
printf("coffset = %ld, Coffset = %ld\n",(long)coffset,(long)Coffset);
#endif
assert(0);
}
funcsym_p->Ssize = Coffset - funcoffset; // size of function
#if NTEXCEPTIONS || MARS
#if (SCPP && NTEXCEPTIONS)
if (usednteh & NTEHcpp)
#elif MARS
if (usednteh & NTEH_try)
#endif
{ assert(!(config.flags & CFGromable));
//printf("framehandleroffset = x%x, coffset = x%x\n",framehandleroffset,coffset);
reftocodseg(cseg,framehandleroffset,coffset);
}
#endif
// Write out switch tables
flag = FALSE; // TRUE if last active block was a ret
for (b = startblock; b; b = b->Bnext)
{
switch (b->BC)
{ case BCjmptab: /* if jump table */
outjmptab(b); /* write out jump table */
break;
case BCswitch:
outswitab(b); /* write out switch table */
break;
case BCret:
case BCretexp:
/* Compute offset to return code from start of function */
retoffset = b->Boffset + b->Bsize - retsize - funcoffset;
#if MARS
/* Add 3 bytes to retoffset in case we have an exception
* handler. THIS PROBABLY NEEDS TO BE IN ANOTHER SPOT BUT
* IT FIXES THE PROBLEM HERE AS WELL.
*/
if (usednteh & NTEH_try)
retoffset += 3;
#endif
flag = TRUE;
break;
case BCexit:
// Fake it to keep debugger happy
retoffset = b->Boffset + b->Bsize - funcoffset;
break;
}
code_free(b->Bcode);
b->Bcode = NULL;
}
if (flag && configv.addlinenumbers && !(funcsym_p->ty() & mTYnaked))
/* put line number at end of function on the
start of the last instruction
*/
/* Instead, try offset to cleanup code */
objlinnum(funcsym_p->Sfunc->Fendline,funcoffset + retoffset);
#if MARS
if (usednteh & NTEH_try)
{
nteh_gentables();
}
if (usednteh & EHtry)
{
except_gentables();
}
#endif
#if SCPP
#if NTEXCEPTIONS
// Write out frame handler
if (usednteh & NTEHcpp)
nteh_framehandler(except_gentables());
else
#endif
{
#if NTEXCEPTIONS
if (usednteh & NTEH_try)
nteh_gentables();
else
#endif
{
if (CPP)
except_gentables();
}
;
}
#endif
}
// Mask of regs saved
// BUG: do interrupt functions save BP?
funcsym_p->Sregsaved = (functy == TYifunc) ? mBP : (mfuncreg | fregsaved);
util_free(csextab);
csextab = NULL;
#ifdef DEBUG
if (stackused != 0)
printf("stackused = %d\n",stackused);
#endif
assert(stackused == 0); /* nobody in 8087 stack */
/* Clean up ndp save array */
mem_free(NDP::save);
NDP::save = NULL;
NDP::savetop = 0;
NDP::savemax = 0;
}
/******************************
* Compute offsets for remaining tmp, automatic and register variables
* that did not make it into registers.
*/
void stackoffsets(int flags)
{ int si;
symbol *s;
targ_size_t Amax,sz;
int offi;
targ_size_t offstack[20];
vec_t tbl = NULL;
//printf("stackoffsets()\n");
if (config.flags4 & CFG4optimized)
{
tbl = vec_calloc(globsym.top);
}
offi = 0; /* index into offstack[] */
Aoffset = 0; /* automatic & register offset */
Toffset = 0; /* temporary offset */
Poffset = 0; /* parameter offset */
EEoffset = 0; // for SCstack's
Amax = 0;
Aalign = REGSIZE;
for (si = 0; si < globsym.top; si++)
{ s = globsym.tab[si];
if (s->Sflags & SFLdead ||
(!anyiasm && !(s->Sflags & SFLread) && s->Sflags & SFLunambig &&
(config.flags4 & CFG4optimized || !config.fulltypes))
)
sz = 0;
else
{ sz = type_size(s->Stype);
if (sz == 0)
sz++; // guard against 0 length structs
}
//dbg_printf("symbol '%s', size = x%lx\n",s->Sident,(long)sz);
assert((int)sz >= 0);
/* Can't do this for CPP because the inline function expander
adds new symbols on the end.
*/
#if AUTONEST
/*printf("symbol '%s', push = %d, pop = %d\n",
s->Sident,s->Spush,s->Spop);*/
/* Can't do this for optimizer if any code motion occurred.
Code motion changes the live range, so variables that
occupy the same space could have live ranges that overlap!
*/
if (config.flags4 & CFG4optimized)
s->Spop = 0;
else
while (s->Spush != 0)
{ s->Spush--;
assert(offi < arraysize(offstack));
/*printf("Pushing offset x%x\n",Aoffset);*/
offstack[offi++] = Aoffset;
}
#endif
switch (s->Sclass)
{
case SCfastpar:
case SCregister:
case SCauto:
if (s->Sfl == FLreg) // if allocated in register
break;
// See if we can share storage with another variable
if (config.flags4 & CFG4optimized &&
// Don't share because could stomp on variables
// used in finally blocks
!(usednteh & ~NTEHjmonitor) &&
s->Srange && sz && flags && !(s->Sflags & SFLspill))
{ int i;
symbol *sp;
for (i = 0; i < si; i++)
{
if (!vec_testbit(i,tbl))
continue;
sp = globsym.tab[i];
//printf("s = '%s', sp = '%s', %d, %d, %d\n",s->Sident,sp->Sident,dfotop,vec_numbits(s->Srange),vec_numbits(sp->Srange));
if (vec_disjoint(s->Srange,sp->Srange) &&
sz <= type_size(sp->Stype))
{
vec_or(sp->Srange,sp->Srange,s->Srange);
//printf("sharing space - '%s' onto '%s'\n",s->Sident,sp->Sident);
s->Soffset = sp->Soffset;
goto L2;
}
}
}
Aoffset = align(sz,Aoffset);
s->Soffset = Aoffset;
//printf("'%s' sz = %d, auto offset = x%lx\n",s->Sident,sz,(long)s->Soffset);
Aoffset += sz;
if (Aoffset > Amax)
Amax = Aoffset;
if (s->Srange && sz && !(s->Sflags & SFLspill))
vec_setbit(si,tbl);
// Align doubles to 8 byte boundary
if (I32 && type_alignsize(s->Stype) > REGSIZE)
Aalign = type_alignsize(s->Stype);
L2:
break;
case SCtmp:
// Allocated separately from SCauto to avoid storage
// overlapping problems.
Toffset = align(sz,Toffset);
s->Soffset = Toffset;
//printf("tmp offset = x%lx\n",(long)s->Soffset);
Toffset += sz;
break;
case SCstack:
EEoffset = align(sz,EEoffset);
s->Soffset = EEoffset;
//printf("EEoffset = x%lx\n",(long)s->Soffset);
EEoffset += sz;
break;
case SCparameter:
Poffset = align(REGSIZE,Poffset); /* align on word stack boundary */
s->Soffset = Poffset;
//dbg_printf("param offset = x%lx\n",(long)s->Soffset);
Poffset += (s->Sflags & SFLdouble)
? type_size(tsdouble) // float passed as double
: type_size(s->Stype);
break;
case SCpseudo:
case SCstatic:
case SCbprel:
break;
default:
#ifdef DEBUG
symbol_print(s);
#endif
assert(0);
}
#if AUTONEST
while (s->Spop != 0)
{ s->Spop--;
assert(offi > 0);
Aoffset = offstack[--offi];
/*printf("Popping offset x%x\n",Aoffset);*/
}
#endif
}
Aoffset = Amax;
Aoffset = align(0,Aoffset);
// printf("Aligned Aoffset = x%lx, Toffset = x%lx\n",
// (long)Aoffset,(long)Toffset);
Toffset = align(0,Toffset);
if (config.flags4 & CFG4optimized)
{
vec_free(tbl);
}
}
/****************************
* Generate code for a block.
*/
STATIC void blcodgen(block *bl)
{ regm_t retregs;
bool jcond;
elem *e;
code *c;
block *nextb;
block *bs1,*bs2;
list_t bpl;
int refparamsave;
regm_t mfuncregsave = mfuncreg;
char *sflsave = NULL;
int anyspill;
//dbg_printf("blcodgen(%p)\n",bl);
/* Determine existing immediate values in registers by ANDing
together the values from all the predecessors of b.
*/
assert(bl->Bregcon.immed.mval == 0);
regcon.immed.mval = 0; // assume no previous contents in registers
// regcon.cse.mval = 0;
for (bpl = bl->Bpred; bpl; bpl = list_next(bpl))
{ block *bp = list_block(bpl);
if (bpl == bl->Bpred)
{ regcon.immed = bp->Bregcon.immed;
regcon.params = bp->Bregcon.params;
// regcon.cse = bp->Bregcon.cse;
}
else
{ int i;
regcon.params &= bp->Bregcon.params;
if ((regcon.immed.mval &= bp->Bregcon.immed.mval) != 0)
// Actual values must match, too
for (i = 0; i < REGMAX; i++)
{
if (regcon.immed.value[i] != bp->Bregcon.immed.value[i])
regcon.immed.mval &= ~mask[i];
}
#if 0
if ((regcon.cse.mval &= bp->Bregcon.cse.mval) != 0)
// Actual values must match, too
for (i = 0; i < REGMAX; i++)
{
if (regcon.cse.value[i] != bp->Bregcon.cse.value[i])
regcon.cse.mval &= ~mask[i];
}
#endif
}
}
regcon.cse.mops &= regcon.cse.mval;
// Set regcon.mvar according to what variables are in registers for this block
c = NULL;
regcon.mvar = 0;
regcon.mpvar = 0;
regcon.indexregs = 1;
anyspill = 0;
if (config.flags4 & CFG4optimized)
{ SYMIDX i;
code *cload = NULL;
code *cstore = NULL;
sflsave = (char *) alloca(globsym.top * sizeof(char));
for (i = 0; i < globsym.top; i++)
{ symbol *s = globsym.tab[i];
sflsave[i] = s->Sfl;
if (s->Sclass & SCfastpar &&
regcon.params & mask[s->Spreg] &&
vec_testbit(dfoidx,s->Srange))
{
regcon.used |= mask[s->Spreg];
}
if (s->Sfl == FLreg)
{ if (vec_testbit(dfoidx,s->Srange))
{ regcon.mvar |= s->Sregm;
if (s->Sclass == SCfastpar)
regcon.mpvar |= s->Sregm;
}
}
else if (s->Sflags & SFLspill)
{ if (vec_testbit(dfoidx,s->Srange))
{
anyspill = i + 1;
cgreg_spillreg_prolog(bl,s,&cstore,&cload);
if (vec_testbit(dfoidx,s->Slvreg))
{ s->Sfl = FLreg;
regcon.mvar |= s->Sregm;
regcon.cse.mval &= ~s->Sregm;
regcon.immed.mval &= ~s->Sregm;
if (s->Sclass == SCfastpar)
regcon.mpvar |= s->Sregm;
}
}
}
}
if ((regcon.cse.mops & regcon.cse.mval) != regcon.cse.mops)
{ code *cx;
cx = cse_save(regcon.cse.mops & ~regcon.cse.mval);
cstore = cat(cx, cstore);
}
c = cat(cstore,cload);
mfuncreg &= ~regcon.mvar; // use these registers
regcon.used |= regcon.mvar;
// Determine if we have more than 1 uncommitted index register
regcon.indexregs = IDXREGS & ~regcon.mvar;
regcon.indexregs &= regcon.indexregs - 1;
}
e = bl->Belem;
retregs = 0;
reflocal = 0;
refparamsave = refparam;
refparam = 0;
assert((regcon.cse.mops & regcon.cse.mval) == regcon.cse.mops);
switch (bl->BC) /* block exit condition */
{
case BCiftrue:
jcond = TRUE;
bs1 = list_block(bl->Bsucc);
bs2 = list_block(list_next(bl->Bsucc));
if (bs1 == bl->Bnext)
{ // Swap bs1 and bs2
block *btmp;
jcond ^= 1;
btmp = bs1;
bs1 = bs2;
bs2 = btmp;
}
c = cat(c,logexp(e,jcond,FLblock,(code *) bs1));
nextb = bs2;
bl->Bcode = NULL;
L2:
if (nextb != bl->Bnext)
{ if (configv.addlinenumbers && bl->Bsrcpos.Slinnum &&
!(funcsym_p->ty() & mTYnaked))
cgen_linnum(&c,bl->Bsrcpos);
assert(!(bl->Bflags & BFLepilog));
c = cat(c,genjmp(CNIL,JMP,FLblock,nextb));
}
bl->Bcode = cat(bl->Bcode,c);
break;
case BCjmptab:
case BCifthen:
case BCswitch:
assert(!(bl->Bflags & BFLepilog));
doswitch(bl); /* hide messy details */
bl->Bcode = cat(c,bl->Bcode);
break;
#if MARS
case BCjcatch:
// Mark all registers as destroyed. This will prevent
// register assignments to variables used in catch blocks.
c = cat(c,getregs(I32 ? allregs : (ALLREGS | mES)));
#if 0 && TARGET_LINUX
if (config.flags3 & CFG3pic && !(allregs & mBX))
{
c = cat(c, cod3_load_got());
}
#endif
goto case_goto;
#endif
#if SCPP
case BCcatch:
// Mark all registers as destroyed. This will prevent
// register assignments to variables used in catch blocks.
c = cat(c,getregs(allregs | mES));
#if 0 && TARGET_LINUX
if (config.flags3 & CFG3pic && !(allregs & mBX))
{
c = cat(c, cod3_load_got());
}
#endif
goto case_goto;
case BCtry:
usednteh |= EHtry;
if (config.flags2 & CFG2seh)
usednteh |= NTEHtry;
goto case_goto;
#endif
case BCgoto:
nextb = list_block(bl->Bsucc);
if ((funcsym_p->Sfunc->Fflags3 & Fnteh ||
(MARS /*&& config.flags2 & CFG2seh*/)) &&
bl->Btry != nextb->Btry &&
nextb->BC != BC_finally)
{ int toindex;
int fromindex;
bl->Bcode = NULL;
c = gencodelem(c,e,&retregs,TRUE);
toindex = nextb->Btry ? nextb->Btry->Bscope_index : -1;
assert(bl->Btry);
fromindex = bl->Btry->Bscope_index;
#if MARS
if (toindex + 1 == fromindex)
{ // Simply call __finally
if (bl->Btry &&
list_block(list_next(bl->Btry->Bsucc))->BC == BCjcatch)
{
goto L2;
}
}
#endif
if (config.flags2 & CFG2seh)
c = cat(c,nteh_unwind(0,toindex));
#if MARS && (TARGET_LINUX || TARGET_OSX)
else if (toindex + 1 <= fromindex)
{
//c = cat(c, linux_unwind(0, toindex));
block *bt;
//printf("B%d: fromindex = %d, toindex = %d\n", bl->Bdfoidx, fromindex, toindex);
bt = bl;
while ((bt = bt->Btry) != NULL && bt->Bscope_index != toindex)
{ block *bf;
//printf("\tbt->Bscope_index = %d, bt->Blast_index = %d\n", bt->Bscope_index, bt->Blast_index);
bf = list_block(list_next(bt->Bsucc));
// Only look at try-finally blocks
if (bf->BC == BCjcatch)
continue;
if (bf == nextb)
continue;
//printf("\tbf = B%d, nextb = B%d\n", bf->Bdfoidx, nextb->Bdfoidx);
if (nextb->BC == BCgoto &&
!nextb->Belem &&
bf == list_block(nextb->Bsucc))
continue;
// call __finally
code *cs;
code *cr;
int nalign = 0;
gensaverestore(retregs,&cs,&cr);
if (STACKALIGN == 16)
{ int npush = (numbitsset(retregs) + 1) * REGSIZE;
if (npush & (STACKALIGN - 1))
{ nalign = STACKALIGN - (npush & (STACKALIGN - 1));
cs = genc2(cs,0x81,modregrm(3,5,SP),nalign); // SUB ESP,nalign
}
}
cs = genc(cs,0xE8,0,0,0,FLblock,(long)list_block(bf->Bsucc));
if (nalign)
cs = genc2(cs,0x81,modregrm(3,0,SP),nalign); // ADD ESP,nalign
c = cat3(c,cs,cr);
}