-
Notifications
You must be signed in to change notification settings - Fork 86
/
Copy pathinterp.c
1219 lines (1116 loc) · 33.5 KB
/
interp.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
/**************************************************************************/
/* */
/* OCaml */
/* */
/* Xavier Leroy, projet Cristal, INRIA Rocquencourt */
/* */
/* Copyright 1996 Institut National de Recherche en Informatique et */
/* en Automatique. */
/* */
/* All rights reserved. This file is distributed under the terms of */
/* the GNU Lesser General Public License version 2.1, with the */
/* special exception on linking described in the file LICENSE. */
/* */
/**************************************************************************/
#define CAML_INTERNALS
/* The bytecode interpreter */
#include <stdio.h>
#include "caml/alloc.h"
#include "caml/backtrace.h"
#include "caml/callback.h"
#include "caml/debugger.h"
#include "caml/fail.h"
#include "caml/fix_code.h"
#include "caml/instrtrace.h"
#include "caml/instruct.h"
#include "caml/interp.h"
#include "caml/major_gc.h"
#include "caml/memory.h"
#include "caml/misc.h"
#include "caml/mlvalues.h"
#include "caml/prims.h"
#include "caml/signals.h"
#include "caml/stacks.h"
#include "caml/startup_aux.h"
/* Registers for the abstract machine:
pc the code pointer
sp the stack pointer (grows downward)
accu the accumulator
env heap-allocated environment
Caml_state->trapsp pointer to the current trap frame
extra_args number of extra arguments provided by the caller
sp is a local copy of the global variable Caml_state->extern_sp. */
/* Instruction decoding */
#ifdef THREADED_CODE
# define Instruct(name) lbl_##name
# if defined(ARCH_SIXTYFOUR) && !defined(ARCH_CODE32)
# define Jumptbl_base &&lbl_ACC0
# else
# define Jumptbl_base 0
# define jumptbl_base ((char *) 0)
# endif
# ifdef DEBUG
# define Next goto next_instr
# else
# define Next goto *(void *)(jumptbl_base + *pc++)
# endif
#else
# define Instruct(name) case name
# define Next break
#endif
/* GC interface */
#undef Alloc_small_origin
// Do call asynchronous callbacks from allocation functions
#define Alloc_small_origin CAML_FROM_CAML
#define Setup_for_gc \
{ sp -= 3; sp[0] = accu; sp[1] = env; sp[2] = (value)pc; \
Caml_state->extern_sp = sp; }
#define Restore_after_gc \
{ sp = Caml_state->extern_sp; accu = sp[0]; env = sp[1]; sp += 3; }
/* We store [pc+1] in the stack so that, in case of an exception, the
first backtrace slot points to the event following the C call
instruction. */
#define Setup_for_c_call \
{ sp -= 2; sp[0] = env; sp[1] = (value)(pc + 1); Caml_state->extern_sp = sp; }
#define Restore_after_c_call \
{ sp = Caml_state->extern_sp; env = *sp; sp += 2; }
/* For VM threads purposes, an event frame must look like accu + a
C_CALL frame + a RETURN 1 frame.
TODO: now that VM threads are gone, we could get rid of that. But
we need to make sure that this is not used elsewhere. */
#define Setup_for_event \
{ sp -= 6; \
sp[0] = accu; /* accu */ \
sp[1] = Val_unit; /* C_CALL frame: dummy environment */ \
sp[2] = Val_unit; /* RETURN frame: dummy local 0 */ \
sp[3] = (value) pc; /* RETURN frame: saved return address */ \
sp[4] = env; /* RETURN frame: saved environment */ \
sp[5] = Val_long(extra_args); /* RETURN frame: saved extra args */ \
Caml_state->extern_sp = sp; }
#define Restore_after_event \
{ sp = Caml_state->extern_sp; accu = sp[0]; \
pc = (code_t) sp[3]; env = sp[4]; extra_args = Long_val(sp[5]); \
sp += 6; }
/* Debugger interface */
#define Setup_for_debugger \
{ sp -= 4; \
sp[0] = accu; sp[1] = (value)(pc - 1); \
sp[2] = env; sp[3] = Val_long(extra_args); \
Caml_state->extern_sp = sp; }
#define Restore_after_debugger \
{ CAMLassert(sp == Caml_state->extern_sp); \
CAMLassert(sp[0] == accu); \
CAMLassert(sp[2] == env); \
sp += 4; }
#ifdef THREADED_CODE
#define Restart_curr_instr \
goto *((void*)(jumptbl_base + caml_debugger_saved_instruction(pc - 1)))
#else
#define Restart_curr_instr \
curr_instr = caml_debugger_saved_instruction(pc - 1); \
goto dispatch_instr
#endif
#define Check_trap_barrier \
if (Caml_state->trapsp >= Caml_state->trap_barrier) \
caml_debugger(TRAP_BARRIER, Val_unit)
/* Register optimization.
Some compilers underestimate the use of the local variables representing
the abstract machine registers, and don't put them in hardware registers,
which slows down the interpreter considerably.
For GCC, I have hand-assigned hardware registers for several architectures.
*/
#if defined(__GNUC__) && !defined(DEBUG) && !defined(__INTEL_COMPILER) \
&& !defined(__llvm__)
#ifdef __mips__
#define PC_REG asm("$16")
#define SP_REG asm("$17")
#define ACCU_REG asm("$18")
#endif
#ifdef __sparc__
#define PC_REG asm("%l0")
#define SP_REG asm("%l1")
#define ACCU_REG asm("%l2")
#endif
#ifdef __alpha__
#ifdef __CRAY__
#define PC_REG asm("r9")
#define SP_REG asm("r10")
#define ACCU_REG asm("r11")
#define JUMPTBL_BASE_REG asm("r12")
#else
#define PC_REG asm("$9")
#define SP_REG asm("$10")
#define ACCU_REG asm("$11")
#define JUMPTBL_BASE_REG asm("$12")
#endif
#endif
#ifdef __i386__
#define PC_REG asm("%esi")
#define SP_REG asm("%edi")
#define ACCU_REG
#endif
#if defined(__ppc__) || defined(__ppc64__)
#define PC_REG asm("26")
#define SP_REG asm("27")
#define ACCU_REG asm("28")
#endif
#ifdef __hppa__
#define PC_REG asm("%r18")
#define SP_REG asm("%r17")
#define ACCU_REG asm("%r16")
#endif
#ifdef __mc68000__
#define PC_REG asm("a5")
#define SP_REG asm("a4")
#define ACCU_REG asm("d7")
#endif
/* PR#4953: these specific registers not available in Thumb mode */
#if defined (__arm__) && !defined(__thumb__)
#define PC_REG asm("r6")
#define SP_REG asm("r8")
#define ACCU_REG asm("r7")
#endif
#ifdef __ia64__
#define PC_REG asm("36")
#define SP_REG asm("37")
#define ACCU_REG asm("38")
#define JUMPTBL_BASE_REG asm("39")
#endif
#ifdef __x86_64__
#define PC_REG asm("%r15")
#define SP_REG asm("%r14")
#define ACCU_REG asm("%r13")
#endif
#ifdef __aarch64__
#define PC_REG asm("%x19")
#define SP_REG asm("%x20")
#define ACCU_REG asm("%x21")
#define JUMPTBL_BASE_REG asm("%x22")
#endif
#endif
#ifdef DEBUG
static intnat caml_bcodcount;
#endif
/* The interpreter itself */
typedef value (*primitive_arity_1)(value);
typedef value (*primitive_arity_2)(value, value);
typedef value (*primitive_arity_3)(value, value, value);
typedef value (*primitive_arity_4)(value, value, value, value);
typedef value (*primitive_arity_5)(value, value, value, value, value);
typedef value (*primitive_arity_n)(value*, int);
value caml_interprete(code_t prog, asize_t prog_size)
{
#ifdef PC_REG
register code_t pc PC_REG;
register value * sp SP_REG;
register value accu ACCU_REG;
#else
register code_t pc;
register value * sp;
register value accu;
#endif
#if defined(THREADED_CODE) && defined(ARCH_SIXTYFOUR) && !defined(ARCH_CODE32)
#ifdef JUMPTBL_BASE_REG
register char * jumptbl_base JUMPTBL_BASE_REG;
#else
register char * jumptbl_base;
#endif
#endif
value env;
intnat extra_args;
struct longjmp_buffer * initial_external_raise;
struct longjmp_buffer * initial_external_raise_async;
intnat initial_sp_offset;
intnat initial_trapsp_offset;
/* volatile ensures that initial_local_roots will keep correct values across
longjmp. The other "initial_..." variables don't need "volatile"
because they aren't changed between the setjmp and any longjmp. */
struct caml__roots_block * volatile initial_local_roots;
struct longjmp_buffer raise_buf, raise_async_buf;
#ifndef THREADED_CODE
opcode_t curr_instr;
#endif
#ifdef THREADED_CODE
static void * jumptable[] = {
# include "caml/jumptbl.h"
};
#endif
if (prog == NULL) { /* Interpreter is initializing */
#ifdef THREADED_CODE
caml_init_thread_code(jumptable, Jumptbl_base);
#endif
return Val_unit;
}
#if defined(THREADED_CODE) && defined(ARCH_SIXTYFOUR) && !defined(ARCH_CODE32)
jumptbl_base = Jumptbl_base;
#endif
initial_local_roots = Caml_state->local_roots;
initial_sp_offset =
(char *) Caml_state->stack_high - (char *) Caml_state->extern_sp;
initial_external_raise = Caml_state->external_raise;
initial_external_raise_async = Caml_state->external_raise_async;
initial_trapsp_offset =
(char *) Caml_state->stack_high - (char *) Caml_state->trapsp;
caml_callback_depth++;
if (sigsetjmp(raise_buf.buf, 0)) {
Caml_state->local_roots = initial_local_roots;
sp = Caml_state->extern_sp;
accu = Caml_state->exn_bucket;
Check_trap_barrier;
if (Caml_state->backtrace_active) {
/* pc has already been pushed on the stack when calling the C
function that raised the exception. No need to push it again
here. */
caml_stash_backtrace(accu, sp, 0);
}
goto raise_notrace;
}
Caml_state->external_raise = &raise_buf;
if (sigsetjmp(raise_async_buf.buf, 0)) {
Caml_state->local_roots = initial_local_roots;
sp = Caml_state->extern_sp;
accu = Caml_state->exn_bucket;
Check_trap_barrier;
if (Caml_state->backtrace_active) {
caml_stash_backtrace(accu, sp, 0);
}
/* Skip any exception handlers installed by this invocation of
[caml_interprete]. This will cause the [raise_notrace] code below to
return asynchronous exceptions to the caller, typically in
[caml_callbackN_exn0]. When that function reraises such an exception
then [Caml_state->trapsp] will correctly be pointing at the most
recent prior trap. */
Caml_state->trapsp = (value *) ((char *) Caml_state->stack_high
- initial_trapsp_offset);
goto raise_notrace;
}
Caml_state->external_raise_async = &raise_async_buf;
sp = Caml_state->extern_sp;
pc = prog;
extra_args = 0;
env = Atom(0);
accu = Val_int(0);
#ifdef THREADED_CODE
#ifdef DEBUG
next_instr:
if (caml_icount-- == 0) caml_stop_here ();
CAMLassert(sp >= Caml_state->stack_low);
CAMLassert(sp <= Caml_state->stack_high);
#endif
goto *(void *)(jumptbl_base + *pc++); /* Jump to the first instruction */
#else
while(1) {
#ifdef DEBUG
caml_bcodcount++;
if (caml_icount-- == 0) caml_stop_here ();
if (caml_trace_level>1) printf("\n##%" ARCH_INTNAT_PRINTF_FORMAT "d\n",
caml_bcodcount);
if (caml_trace_level>0) caml_disasm_instr(pc);
if (caml_trace_level>1) {
printf("env=");
caml_trace_value_file(env,prog,prog_size,stdout);
putchar('\n');
caml_trace_accu_sp_file(accu,sp,prog,prog_size,stdout);
fflush(stdout);
};
CAMLassert(sp >= Caml_state->stack_low);
CAMLassert(sp <= Caml_state->stack_high);
#endif
curr_instr = *pc++;
dispatch_instr:
switch(curr_instr) {
#endif
/* Basic stack operations */
Instruct(ACC0):
accu = sp[0]; Next;
Instruct(ACC1):
accu = sp[1]; Next;
Instruct(ACC2):
accu = sp[2]; Next;
Instruct(ACC3):
accu = sp[3]; Next;
Instruct(ACC4):
accu = sp[4]; Next;
Instruct(ACC5):
accu = sp[5]; Next;
Instruct(ACC6):
accu = sp[6]; Next;
Instruct(ACC7):
accu = sp[7]; Next;
Instruct(PUSH): Instruct(PUSHACC0):
*--sp = accu; Next;
Instruct(PUSHACC1):
*--sp = accu; accu = sp[1]; Next;
Instruct(PUSHACC2):
*--sp = accu; accu = sp[2]; Next;
Instruct(PUSHACC3):
*--sp = accu; accu = sp[3]; Next;
Instruct(PUSHACC4):
*--sp = accu; accu = sp[4]; Next;
Instruct(PUSHACC5):
*--sp = accu; accu = sp[5]; Next;
Instruct(PUSHACC6):
*--sp = accu; accu = sp[6]; Next;
Instruct(PUSHACC7):
*--sp = accu; accu = sp[7]; Next;
Instruct(PUSHACC):
*--sp = accu;
/* Fallthrough */
Instruct(ACC):
accu = sp[*pc++];
Next;
Instruct(POP):
sp += *pc++;
Next;
Instruct(ASSIGN):
sp[*pc++] = accu;
accu = Val_unit;
Next;
/* Access in heap-allocated environment */
Instruct(ENVACC1):
accu = Field(env, 1); Next;
Instruct(ENVACC2):
accu = Field(env, 2); Next;
Instruct(ENVACC3):
accu = Field(env, 3); Next;
Instruct(ENVACC4):
accu = Field(env, 4); Next;
Instruct(PUSHENVACC1):
*--sp = accu; accu = Field(env, 1); Next;
Instruct(PUSHENVACC2):
*--sp = accu; accu = Field(env, 2); Next;
Instruct(PUSHENVACC3):
*--sp = accu; accu = Field(env, 3); Next;
Instruct(PUSHENVACC4):
*--sp = accu; accu = Field(env, 4); Next;
Instruct(PUSHENVACC):
*--sp = accu;
/* Fallthrough */
Instruct(ENVACC):
accu = Field(env, *pc++);
Next;
/* Function application */
Instruct(PUSH_RETADDR): {
sp -= 3;
sp[0] = (value) (pc + *pc);
sp[1] = env;
sp[2] = Val_long(extra_args);
pc++;
Next;
}
Instruct(APPLY): {
extra_args = *pc - 1;
pc = Code_val(accu);
env = accu;
goto check_stacks;
}
Instruct(APPLY1): {
value arg1 = sp[0];
sp -= 3;
sp[0] = arg1;
sp[1] = (value)pc;
sp[2] = env;
sp[3] = Val_long(extra_args);
pc = Code_val(accu);
env = accu;
extra_args = 0;
goto check_stacks;
}
Instruct(APPLY2): {
value arg1 = sp[0];
value arg2 = sp[1];
sp -= 3;
sp[0] = arg1;
sp[1] = arg2;
sp[2] = (value)pc;
sp[3] = env;
sp[4] = Val_long(extra_args);
pc = Code_val(accu);
env = accu;
extra_args = 1;
goto check_stacks;
}
Instruct(APPLY3): {
value arg1 = sp[0];
value arg2 = sp[1];
value arg3 = sp[2];
sp -= 3;
sp[0] = arg1;
sp[1] = arg2;
sp[2] = arg3;
sp[3] = (value)pc;
sp[4] = env;
sp[5] = Val_long(extra_args);
pc = Code_val(accu);
env = accu;
extra_args = 2;
goto check_stacks;
}
Instruct(APPTERM): {
int nargs = *pc++;
int slotsize = *pc;
value * newsp;
int i;
/* Slide the nargs bottom words of the current frame to the top
of the frame, and discard the remainder of the frame */
newsp = sp + slotsize - nargs;
for (i = nargs - 1; i >= 0; i--) newsp[i] = sp[i];
sp = newsp;
pc = Code_val(accu);
env = accu;
extra_args += nargs - 1;
goto check_stacks;
}
Instruct(APPTERM1): {
value arg1 = sp[0];
sp = sp + *pc - 1;
sp[0] = arg1;
pc = Code_val(accu);
env = accu;
goto check_stacks;
}
Instruct(APPTERM2): {
value arg1 = sp[0];
value arg2 = sp[1];
sp = sp + *pc - 2;
sp[0] = arg1;
sp[1] = arg2;
pc = Code_val(accu);
env = accu;
extra_args += 1;
goto check_stacks;
}
Instruct(APPTERM3): {
value arg1 = sp[0];
value arg2 = sp[1];
value arg3 = sp[2];
sp = sp + *pc - 3;
sp[0] = arg1;
sp[1] = arg2;
sp[2] = arg3;
pc = Code_val(accu);
env = accu;
extra_args += 2;
goto check_stacks;
}
Instruct(RETURN): {
sp += *pc++;
if (extra_args > 0) {
extra_args--;
pc = Code_val(accu);
env = accu;
} else {
pc = (code_t)(sp[0]);
env = sp[1];
extra_args = Long_val(sp[2]);
sp += 3;
}
Next;
}
Instruct(RESTART): {
int num_args = Wosize_val(env) - 3;
int i;
sp -= num_args;
for (i = 0; i < num_args; i++) sp[i] = Field(env, i + 3);
env = Field(env, 2);
extra_args += num_args;
Next;
}
Instruct(GRAB): {
int required = *pc++;
if (extra_args >= required) {
extra_args -= required;
} else {
mlsize_t num_args, i;
num_args = 1 + extra_args; /* arg1 + extra args */
Alloc_small(accu, num_args + 3, Closure_tag);
Field(accu, 2) = env;
for (i = 0; i < num_args; i++) Field(accu, i + 3) = sp[i];
Code_val(accu) = pc - 3; /* Point to the preceding RESTART instr. */
Closinfo_val(accu) = Make_closinfo(0, 2, 1);
sp += num_args;
pc = (code_t)(sp[0]);
env = sp[1];
extra_args = Long_val(sp[2]);
sp += 3;
}
Next;
}
Instruct(CLOSURE): {
int nvars = *pc++;
int i;
if (nvars > 0) *--sp = accu;
if (nvars <= Max_young_wosize - 2) {
/* nvars + 2 <= Max_young_wosize, can allocate in minor heap */
Alloc_small(accu, 2 + nvars, Closure_tag);
for (i = 0; i < nvars; i++) Field(accu, i + 2) = sp[i];
} else {
/* PR#6385: must allocate in major heap */
/* caml_alloc_shr and caml_initialize never trigger a GC,
so no need to Setup_for_gc */
accu = caml_alloc_shr(2 + nvars, Closure_tag);
for (i = 0; i < nvars; i++) caml_initialize(&Field(accu, i + 2), sp[i]);
}
/* The code pointer is not in the heap, so no need to go through
caml_initialize. */
Code_val(accu) = pc + *pc;
Closinfo_val(accu) = Make_closinfo(0, 2, 1);
pc++;
sp += nvars;
Next;
}
Instruct(CLOSUREREC): {
int nfuncs = *pc++;
int nvars = *pc++;
mlsize_t envofs = nfuncs * 3 - 1;
mlsize_t blksize = envofs + nvars;
int i;
value * p;
if (nvars > 0) *--sp = accu;
if (blksize <= Max_young_wosize) {
Alloc_small(accu, blksize, Closure_tag);
p = &Field(accu, envofs);
for (i = 0; i < nvars; i++, p++) *p = sp[i];
} else {
/* PR#6385: must allocate in major heap */
/* caml_alloc_shr and caml_initialize never trigger a GC,
so no need to Setup_for_gc */
accu = caml_alloc_shr(blksize, Closure_tag);
p = &Field(accu, envofs);
for (i = 0; i < nvars; i++, p++) caml_initialize(p, sp[i]);
}
sp += nvars;
/* The code pointers and infix headers are not in the heap,
so no need to go through caml_initialize. */
*--sp = accu;
p = &Field(accu, 0);
*p++ = (value) (pc + pc[0]);
*p++ = Make_closinfo(0, envofs, nfuncs < 2);
for (i = 1; i < nfuncs; i++) {
*p++ = Make_header(i * 3, Infix_tag, Caml_white); /* color irrelevant */
*--sp = (value) p;
*p++ = (value) (pc + pc[i]);
envofs -= 3;
CAMLassert(i <= nfuncs - 1);
*p++ = Make_closinfo(0, envofs, i == nfuncs - 1);
}
pc += nfuncs;
Next;
}
Instruct(PUSHOFFSETCLOSURE):
*--sp = accu; /* fallthrough */
Instruct(OFFSETCLOSURE):
accu = env + *pc++ * sizeof(value); Next;
Instruct(PUSHOFFSETCLOSUREM3):
*--sp = accu; /* fallthrough */
Instruct(OFFSETCLOSUREM3):
accu = env - 3 * sizeof(value); Next;
Instruct(PUSHOFFSETCLOSURE0):
*--sp = accu; /* fallthrough */
Instruct(OFFSETCLOSURE0):
accu = env; Next;
Instruct(PUSHOFFSETCLOSURE3):
*--sp = accu; /* fallthrough */
Instruct(OFFSETCLOSURE3):
accu = env + 3 * sizeof(value); Next;
/* Access to global variables */
Instruct(PUSHGETGLOBAL):
*--sp = accu;
/* Fallthrough */
Instruct(GETGLOBAL):
accu = Field(caml_global_data, *pc);
pc++;
Next;
Instruct(PUSHGETGLOBALFIELD):
*--sp = accu;
/* Fallthrough */
Instruct(GETGLOBALFIELD): {
accu = Field(caml_global_data, *pc);
pc++;
accu = Field(accu, *pc);
pc++;
Next;
}
Instruct(SETGLOBAL):
caml_modify(&Field(caml_global_data, *pc), accu);
accu = Val_unit;
pc++;
Next;
/* Allocation of blocks */
Instruct(PUSHATOM0):
*--sp = accu;
/* Fallthrough */
Instruct(ATOM0):
accu = Atom(0); Next;
Instruct(PUSHATOM):
*--sp = accu;
/* Fallthrough */
Instruct(ATOM):
accu = Atom(*pc++); Next;
Instruct(MAKEBLOCK): {
mlsize_t wosize = *pc++;
tag_t tag = *pc++;
mlsize_t i;
value block;
if (wosize <= Max_young_wosize) {
Alloc_small(block, wosize, tag);
Field(block, 0) = accu;
for (i = 1; i < wosize; i++) Field(block, i) = *sp++;
} else {
block = caml_alloc_shr(wosize, tag);
caml_initialize(&Field(block, 0), accu);
for (i = 1; i < wosize; i++) caml_initialize(&Field(block, i), *sp++);
}
accu = block;
Next;
}
Instruct(MAKEBLOCK1): {
tag_t tag = *pc++;
value block;
Alloc_small(block, 1, tag);
Field(block, 0) = accu;
accu = block;
Next;
}
Instruct(MAKEBLOCK2): {
tag_t tag = *pc++;
value block;
Alloc_small(block, 2, tag);
Field(block, 0) = accu;
Field(block, 1) = sp[0];
sp += 1;
accu = block;
Next;
}
Instruct(MAKEBLOCK3): {
tag_t tag = *pc++;
value block;
Alloc_small(block, 3, tag);
Field(block, 0) = accu;
Field(block, 1) = sp[0];
Field(block, 2) = sp[1];
sp += 2;
accu = block;
Next;
}
Instruct(MAKEFLOATBLOCK): {
mlsize_t size = *pc++;
mlsize_t i;
value block;
if (size <= Max_young_wosize / Double_wosize) {
Alloc_small(block, size * Double_wosize, Double_array_tag);
} else {
block = caml_alloc_shr(size * Double_wosize, Double_array_tag);
}
Store_double_flat_field(block, 0, Double_val(accu));
for (i = 1; i < size; i++){
Store_double_flat_field(block, i, Double_val(*sp));
++ sp;
}
accu = block;
Next;
}
/* Access to components of blocks */
Instruct(GETFIELD0):
accu = Field(accu, 0); Next;
Instruct(GETFIELD1):
accu = Field(accu, 1); Next;
Instruct(GETFIELD2):
accu = Field(accu, 2); Next;
Instruct(GETFIELD3):
accu = Field(accu, 3); Next;
Instruct(GETFIELD):
accu = Field(accu, *pc); pc++; Next;
Instruct(GETFLOATFIELD): {
double d = Double_flat_field(accu, *pc++);
Alloc_small(accu, Double_wosize, Double_tag);
Store_double_val(accu, d);
Next;
}
Instruct(SETFIELD0):
caml_modify(&Field(accu, 0), *sp++);
accu = Val_unit;
Next;
Instruct(SETFIELD1):
caml_modify(&Field(accu, 1), *sp++);
accu = Val_unit;
Next;
Instruct(SETFIELD2):
caml_modify(&Field(accu, 2), *sp++);
accu = Val_unit;
Next;
Instruct(SETFIELD3):
caml_modify(&Field(accu, 3), *sp++);
accu = Val_unit;
Next;
Instruct(SETFIELD):
caml_modify(&Field(accu, *pc), *sp++);
accu = Val_unit;
pc++;
Next;
Instruct(SETFLOATFIELD):
Store_double_flat_field(accu, *pc, Double_val(*sp));
accu = Val_unit;
sp++;
pc++;
Next;
/* Array operations */
Instruct(VECTLENGTH): {
/* Todo: when FLAT_FLOAT_ARRAY is false, this instruction should
be split into VECTLENGTH and FLOATVECTLENGTH because we know
statically which one it is. */
mlsize_t size = Wosize_val(accu);
if (Tag_val(accu) == Double_array_tag) size = size / Double_wosize;
accu = Val_long(size);
Next;
}
Instruct(GETVECTITEM):
accu = Field(accu, Long_val(sp[0]));
sp += 1;
Next;
Instruct(SETVECTITEM):
caml_modify(&Field(accu, Long_val(sp[0])), sp[1]);
accu = Val_unit;
sp += 2;
Next;
/* Bytes/String operations */
Instruct(GETSTRINGCHAR):
Instruct(GETBYTESCHAR):
accu = Val_int(Byte_u(accu, Long_val(sp[0])));
sp += 1;
Next;
Instruct(SETBYTESCHAR):
Byte_u(accu, Long_val(sp[0])) = Int_val(sp[1]);
sp += 2;
accu = Val_unit;
Next;
/* Branches and conditional branches */
Instruct(BRANCH):
pc += *pc;
Next;
Instruct(BRANCHIF):
if (accu != Val_false) pc += *pc; else pc++;
Next;
Instruct(BRANCHIFNOT):
if (accu == Val_false) pc += *pc; else pc++;
Next;
Instruct(SWITCH): {
uint32_t sizes = *pc++;
if (Is_block(accu)) {
intnat index = Tag_val(accu);
CAMLassert ((uintnat) index < (sizes >> 16));
pc += pc[(sizes & 0xFFFF) + index];
} else {
intnat index = Long_val(accu);
CAMLassert ((uintnat) index < (sizes & 0xFFFF)) ;
pc += pc[index];
}
Next;
}
Instruct(BOOLNOT):
accu = Val_not(accu);
Next;
/* Exceptions */
Instruct(PUSHTRAP):
sp -= 4;
Trap_pc(sp) = pc + *pc;
Trap_link_offset(sp) = Val_long(Caml_state->trapsp - sp);
sp[2] = env;
sp[3] = Val_long(extra_args);
Caml_state->trapsp = sp;
pc++;
Next;
Instruct(POPTRAP):
if (caml_something_to_do) {
/* We must check here so that if a signal is pending and its
handler triggers an exception, the exception is trapped
by the current try...with, not the enclosing one. */
pc--; /* restart the POPTRAP after processing the signal */
goto process_actions;
}
Caml_state->trapsp = sp + Long_val(Trap_link_offset(sp));
sp += 4;
Next;
Instruct(RAISE_NOTRACE):
Check_trap_barrier;
goto raise_notrace;
Instruct(RERAISE):
Check_trap_barrier;
if (Caml_state->backtrace_active) {
*--sp = (value)(pc - 1);
caml_stash_backtrace(accu, sp, 1);
}
goto raise_notrace;
Instruct(RAISE):
Check_trap_barrier;
if (Caml_state->backtrace_active) {
*--sp = (value)(pc - 1);
caml_stash_backtrace(accu, sp, 0);
}
raise_notrace:
if ((char *) Caml_state->trapsp
>= (char *) Caml_state->stack_high - initial_sp_offset) {
Caml_state->external_raise = initial_external_raise;
Caml_state->external_raise_async = initial_external_raise_async;
Caml_state->extern_sp = (value *) ((char *) Caml_state->stack_high
- initial_sp_offset);
caml_callback_depth--;
return Make_exception_result(accu);
}
sp = Caml_state->trapsp;
pc = Trap_pc(sp);
Caml_state->trapsp = sp + Long_val(Trap_link_offset(sp));
env = sp[2];
extra_args = Long_val(sp[3]);
sp += 4;
Next;
/* Stack checks */
check_stacks:
if (sp < Caml_state->stack_threshold) {
Caml_state->extern_sp = sp;
caml_realloc_stack(Stack_threshold / sizeof(value));
sp = Caml_state->extern_sp;
}
/* Fall through CHECK_SIGNALS */
/* Signal handling */
Instruct(CHECK_SIGNALS): /* accu not preserved */
if (caml_something_to_do) goto process_actions;
Next;
process_actions:
Setup_for_event;
caml_process_pending_actions();
Restore_after_event;
Next;
/* Calling C functions */
Instruct(C_CALL1):
Setup_for_c_call;
accu = ((primitive_arity_1) Primitive(*pc))(accu);
Restore_after_c_call;
pc++;
Next;
Instruct(C_CALL2):
Setup_for_c_call;
accu = ((primitive_arity_2) Primitive(*pc))(accu, sp[2]);
Restore_after_c_call;
sp += 1;
pc++;
Next;
Instruct(C_CALL3):
Setup_for_c_call;
accu = ((primitive_arity_3)Primitive(*pc))(accu, sp[2], sp[3]);
Restore_after_c_call;
sp += 2;
pc++;
Next;
Instruct(C_CALL4):
Setup_for_c_call;
accu = ((primitive_arity_4) Primitive(*pc))(accu, sp[2], sp[3], sp[4]);
Restore_after_c_call;
sp += 3;
pc++;
Next;
Instruct(C_CALL5):
Setup_for_c_call;
accu = ((primitive_arity_5) Primitive(*pc))(accu, sp[2], sp[3], sp[4], sp[5]);
Restore_after_c_call;
sp += 4;
pc++;
Next;