forked from ocaml/ocaml
-
Notifications
You must be signed in to change notification settings - Fork 2
/
Copy pathintern.c
1086 lines (989 loc) · 31.3 KB
/
intern.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
/* Structured input, compact format */
/* The interface of this file is "caml/intext.h" */
#include <string.h>
#include <stdio.h>
#include "caml/alloc.h"
#include "caml/callback.h"
#include "caml/config.h"
#include "caml/custom.h"
#include "caml/fail.h"
#include "caml/gc.h"
#include "caml/intext.h"
#include "caml/io.h"
#include "caml/md5.h"
#include "caml/memory.h"
#include "caml/mlvalues.h"
#include "caml/misc.h"
#include "caml/reverse.h"
static unsigned char * intern_src;
/* Reading pointer in block holding input data. */
static unsigned char * intern_input = NULL;
/* Pointer to beginning of block holding input data,
if non-NULL this pointer will be freed by the cleanup function. */
static header_t * intern_dest;
/* Writing pointer in destination block */
static char * intern_extra_block = NULL;
/* If non-NULL, point to new heap chunk allocated with caml_alloc_for_heap. */
static asize_t obj_counter;
/* Count how many objects seen so far */
static value * intern_obj_table = NULL;
/* The pointers to objects already seen */
static color_t intern_color;
/* Color to assign to newly created headers */
static header_t intern_header;
/* Original header of the destination block.
Meaningful only if intern_extra_block is NULL. */
static value intern_block = 0;
/* Point to the heap block allocated as destination block.
Meaningful only if intern_extra_block is NULL. */
static char * intern_resolve_code_pointer(unsigned char digest[16],
asize_t offset);
CAMLnoreturn_start
static void intern_bad_code_pointer(unsigned char digest[16])
CAMLnoreturn_end;
static void intern_free_stack(void);
static inline unsigned char read8u(void)
{ return *intern_src++; }
static inline signed char read8s(void)
{ return *intern_src++; }
static inline uint16_t read16u(void)
{
uint16_t res = (intern_src[0] << 8) + intern_src[1];
intern_src += 2;
return res;
}
static inline int16_t read16s(void)
{
int16_t res = (intern_src[0] << 8) + intern_src[1];
intern_src += 2;
return res;
}
static inline uint32_t read32u(void)
{
uint32_t res =
((uint32_t)(intern_src[0]) << 24) + (intern_src[1] << 16)
+ (intern_src[2] << 8) + intern_src[3];
intern_src += 4;
return res;
}
static inline int32_t read32s(void)
{
int32_t res =
((uint32_t)(intern_src[0]) << 24) + (intern_src[1] << 16)
+ (intern_src[2] << 8) + intern_src[3];
intern_src += 4;
return res;
}
#ifdef ARCH_SIXTYFOUR
static uintnat read64u(void)
{
uintnat res =
((uintnat) (intern_src[0]) << 56)
+ ((uintnat) (intern_src[1]) << 48)
+ ((uintnat) (intern_src[2]) << 40)
+ ((uintnat) (intern_src[3]) << 32)
+ ((uintnat) (intern_src[4]) << 24)
+ ((uintnat) (intern_src[5]) << 16)
+ ((uintnat) (intern_src[6]) << 8)
+ (uintnat) (intern_src[7]);
intern_src += 8;
return res;
}
#endif
static inline void readblock(void * dest, intnat len)
{
memcpy(dest, intern_src, len);
intern_src += len;
}
static void intern_init(void * src, void * input)
{
/* This is asserted at the beginning of demarshaling primitives.
If it fails, it probably means that an exception was raised
without calling intern_cleanup() during the previous demarshaling. */
CAMLassert (intern_input == NULL && intern_obj_table == NULL \
&& intern_extra_block == NULL && intern_block == 0);
intern_src = src;
intern_input = input;
}
static void intern_cleanup(void)
{
if (intern_input != NULL) {
caml_stat_free(intern_input);
intern_input = NULL;
}
if (intern_obj_table != NULL) {
caml_stat_free(intern_obj_table);
intern_obj_table = NULL;
}
if (intern_extra_block != NULL) {
/* free newly allocated heap chunk */
caml_free_for_heap(intern_extra_block);
intern_extra_block = NULL;
} else if (intern_block != 0) {
/* restore original header for heap block, otherwise GC is confused */
Hd_val(intern_block) = intern_header;
intern_block = 0;
}
/* free the recursion stack */
intern_free_stack();
}
static void readfloat(double * dest, unsigned int code)
{
if (sizeof(double) != 8) {
intern_cleanup();
caml_invalid_argument("input_value: non-standard floats");
}
readblock((char *) dest, 8);
/* Fix up endianness, if needed */
#if ARCH_FLOAT_ENDIANNESS == 0x76543210
/* Host is big-endian; fix up if data read is little-endian */
if (code != CODE_DOUBLE_BIG) Reverse_64(dest, dest);
#elif ARCH_FLOAT_ENDIANNESS == 0x01234567
/* Host is little-endian; fix up if data read is big-endian */
if (code != CODE_DOUBLE_LITTLE) Reverse_64(dest, dest);
#else
/* Host is neither big nor little; permute as appropriate */
if (code == CODE_DOUBLE_LITTLE)
Permute_64(dest, ARCH_FLOAT_ENDIANNESS, dest, 0x01234567)
else
Permute_64(dest, ARCH_FLOAT_ENDIANNESS, dest, 0x76543210);
#endif
}
/* [len] is a number of floats */
static void readfloats(double * dest, mlsize_t len, unsigned int code)
{
mlsize_t i;
if (sizeof(double) != 8) {
intern_cleanup();
caml_invalid_argument("input_value: non-standard floats");
}
readblock((char *) dest, len * 8);
/* Fix up endianness, if needed */
#if ARCH_FLOAT_ENDIANNESS == 0x76543210
/* Host is big-endian; fix up if data read is little-endian */
if (code != CODE_DOUBLE_ARRAY8_BIG &&
code != CODE_DOUBLE_ARRAY32_BIG) {
for (i = 0; i < len; i++) Reverse_64(dest + i, dest + i);
}
#elif ARCH_FLOAT_ENDIANNESS == 0x01234567
/* Host is little-endian; fix up if data read is big-endian */
if (code != CODE_DOUBLE_ARRAY8_LITTLE &&
code != CODE_DOUBLE_ARRAY32_LITTLE) {
for (i = 0; i < len; i++) Reverse_64(dest + i, dest + i);
}
#else
/* Host is neither big nor little; permute as appropriate */
if (code == CODE_DOUBLE_ARRAY8_LITTLE ||
code == CODE_DOUBLE_ARRAY32_LITTLE) {
for (i = 0; i < len; i++)
Permute_64(dest + i, ARCH_FLOAT_ENDIANNESS, dest + i, 0x01234567);
} else {
for (i = 0; i < len; i++)
Permute_64(dest + i, ARCH_FLOAT_ENDIANNESS, dest + i, 0x76543210);
}
#endif
}
/* Item on the stack with defined operation */
struct intern_item {
value * dest;
intnat arg;
enum {
OReadItems, /* read arg items and store them in dest[0], dest[1], ... */
OFreshOID, /* generate a fresh OID and store it in *dest */
OShift /* offset *dest by arg */
} op;
};
/* FIXME: This is duplicated in two other places, with the only difference of
the type of elements stored in the stack. Possible solution in C would
be to instantiate stack these function via. C preprocessor macro.
*/
#define INTERN_STACK_INIT_SIZE 256
#define INTERN_STACK_MAX_SIZE (1024*1024*100)
static struct intern_item intern_stack_init[INTERN_STACK_INIT_SIZE];
static struct intern_item * intern_stack = intern_stack_init;
static struct intern_item * intern_stack_limit = intern_stack_init
+ INTERN_STACK_INIT_SIZE;
/* Free the recursion stack if needed */
static void intern_free_stack(void)
{
if (intern_stack != intern_stack_init) {
caml_stat_free(intern_stack);
/* Reinitialize the globals for next time around */
intern_stack = intern_stack_init;
intern_stack_limit = intern_stack + INTERN_STACK_INIT_SIZE;
}
}
/* Same, then raise Out_of_memory */
CAMLnoreturn_start
static void intern_stack_overflow(void)
CAMLnoreturn_end;
static void intern_stack_overflow(void)
{
caml_gc_message (0x04, "Stack overflow in un-marshaling value\n");
intern_free_stack();
caml_raise_out_of_memory();
}
static struct intern_item * intern_resize_stack(struct intern_item * sp)
{
asize_t newsize = 2 * (intern_stack_limit - intern_stack);
asize_t sp_offset = sp - intern_stack;
struct intern_item * newstack;
if (newsize >= INTERN_STACK_MAX_SIZE) intern_stack_overflow();
if (intern_stack == intern_stack_init) {
newstack = caml_stat_alloc_noexc(sizeof(struct intern_item) * newsize);
if (newstack == NULL) intern_stack_overflow();
memcpy(newstack, intern_stack_init,
sizeof(struct intern_item) * INTERN_STACK_INIT_SIZE);
} else {
newstack = caml_stat_resize_noexc(intern_stack,
sizeof(struct intern_item) * newsize);
if (newstack == NULL) intern_stack_overflow();
}
intern_stack = newstack;
intern_stack_limit = newstack + newsize;
return newstack + sp_offset;
}
/* Convenience macros for requesting operation on the stack */
#define PushItem() \
do { \
sp++; \
if (sp >= intern_stack_limit) sp = intern_resize_stack(sp); \
} while(0)
#define ReadItems(_dest,_n) \
do { \
if (_n > 0) { \
PushItem(); \
sp->op = OReadItems; \
sp->dest = _dest; \
sp->arg = _n; \
} \
} while(0)
static void intern_rec(value *dest)
{
unsigned int code;
tag_t tag;
mlsize_t size, len, ofs_ind;
value v;
asize_t ofs;
header_t header;
unsigned char digest[16];
struct custom_operations * ops;
char * codeptr;
struct intern_item * sp;
sp = intern_stack;
/* Initially let's try to read the first object from the stream */
ReadItems(dest, 1);
/* The un-marshaler loop, the recursion is unrolled */
while(sp != intern_stack) {
/* Interpret next item on the stack */
dest = sp->dest;
switch (sp->op) {
case OFreshOID:
/* Refresh the object ID */
/* but do not do it for predefined exception slots */
if (Long_val(Field((value)dest, 1)) >= 0)
caml_set_oo_id((value)dest);
/* Pop item and iterate */
sp--;
break;
case OShift:
/* Shift value by an offset */
*dest += sp->arg;
/* Pop item and iterate */
sp--;
break;
case OReadItems:
/* Pop item */
sp->dest++;
if (--(sp->arg) == 0) sp--;
/* Read a value and set v to this value */
code = read8u();
if (code >= PREFIX_SMALL_INT) {
if (code >= PREFIX_SMALL_BLOCK) {
/* Small block */
tag = code & 0xF;
size = (code >> 4) & 0x7;
read_block:
if (size == 0) {
v = Atom(tag);
} else {
v = Val_hp(intern_dest);
if (intern_obj_table != NULL) intern_obj_table[obj_counter++] = v;
*intern_dest = Make_header_allocated_here(size, tag, intern_color);
intern_dest += 1 + size;
/* For objects, we need to freshen the oid */
if (tag == Object_tag) {
CAMLassert(size >= 2);
/* Request to read rest of the elements of the block */
ReadItems(&Field(v, 2), size - 2);
/* Request freshing OID */
PushItem();
sp->op = OFreshOID;
sp->dest = (value*) v;
sp->arg = 1;
/* Finally read first two block elements: method table and old OID */
ReadItems(&Field(v, 0), 2);
} else
/* If it's not an object then read the contents of the block */
ReadItems(&Field(v, 0), size);
}
} else {
/* Small integer */
v = Val_int(code & 0x3F);
}
} else {
if (code >= PREFIX_SMALL_STRING) {
/* Small string */
len = (code & 0x1F);
read_string:
size = (len + sizeof(value)) / sizeof(value);
v = Val_hp(intern_dest);
if (intern_obj_table != NULL) intern_obj_table[obj_counter++] = v;
*intern_dest = Make_header_allocated_here(size, String_tag, intern_color);
intern_dest += 1 + size;
Field(v, size - 1) = 0;
ofs_ind = Bsize_wsize(size) - 1;
Byte(v, ofs_ind) = ofs_ind - len;
readblock((char *)String_val(v), len);
} else {
switch(code) {
case CODE_INT8:
v = Val_long(read8s());
break;
case CODE_INT16:
v = Val_long(read16s());
break;
case CODE_INT32:
v = Val_long(read32s());
break;
case CODE_INT64:
#ifdef ARCH_SIXTYFOUR
v = Val_long((intnat) (read64u()));
break;
#else
intern_cleanup();
caml_failwith("input_value: integer too large");
break;
#endif
case CODE_SHARED8:
ofs = read8u();
read_shared:
CAMLassert (ofs > 0);
CAMLassert (ofs <= obj_counter);
CAMLassert (intern_obj_table != NULL);
v = intern_obj_table[obj_counter - ofs];
break;
case CODE_SHARED16:
ofs = read16u();
goto read_shared;
case CODE_SHARED32:
ofs = read32u();
goto read_shared;
#ifdef ARCH_SIXTYFOUR
case CODE_SHARED64:
ofs = read64u();
goto read_shared;
#endif
case CODE_BLOCK32:
header = (header_t) read32u();
tag = Tag_hd(header);
size = Wosize_hd(header);
goto read_block;
#ifdef ARCH_SIXTYFOUR
case CODE_BLOCK64:
header = (header_t) read64u();
tag = Tag_hd(header);
size = Wosize_hd(header);
goto read_block;
#endif
case CODE_STRING8:
len = read8u();
goto read_string;
case CODE_STRING32:
len = read32u();
goto read_string;
#ifdef ARCH_SIXTYFOUR
case CODE_STRING64:
len = read64u();
goto read_string;
#endif
case CODE_DOUBLE_LITTLE:
case CODE_DOUBLE_BIG:
v = Val_hp(intern_dest);
if (intern_obj_table != NULL) intern_obj_table[obj_counter++] = v;
*intern_dest = Make_header_allocated_here(Double_wosize, Double_tag,
intern_color);
intern_dest += 1 + Double_wosize;
readfloat((double *) v, code);
break;
case CODE_DOUBLE_ARRAY8_LITTLE:
case CODE_DOUBLE_ARRAY8_BIG:
len = read8u();
read_double_array:
size = len * Double_wosize;
v = Val_hp(intern_dest);
if (intern_obj_table != NULL) intern_obj_table[obj_counter++] = v;
*intern_dest = Make_header_allocated_here(size, Double_array_tag,
intern_color);
intern_dest += 1 + size;
readfloats((double *) v, len, code);
break;
case CODE_DOUBLE_ARRAY32_LITTLE:
case CODE_DOUBLE_ARRAY32_BIG:
len = read32u();
goto read_double_array;
#ifdef ARCH_SIXTYFOUR
case CODE_DOUBLE_ARRAY64_LITTLE:
case CODE_DOUBLE_ARRAY64_BIG:
len = read64u();
goto read_double_array;
#endif
case CODE_CODEPOINTER:
ofs = read32u();
readblock(digest, 16);
codeptr = intern_resolve_code_pointer(digest, ofs);
if (codeptr != NULL) {
v = (value) codeptr;
} else {
const value * function_placeholder =
caml_named_value ("Debugger.function_placeholder");
if (function_placeholder != NULL) {
v = *function_placeholder;
} else {
intern_cleanup();
intern_bad_code_pointer(digest);
}
}
break;
case CODE_INFIXPOINTER:
ofs = read32u();
/* Read a value to *dest, then offset *dest by ofs */
PushItem();
sp->dest = dest;
sp->op = OShift;
sp->arg = ofs;
ReadItems(dest, 1);
continue; /* with next iteration of main loop, skipping *dest = v */
case CODE_CUSTOM:
case CODE_CUSTOM_LEN:
case CODE_CUSTOM_FIXED: {
ops = caml_find_custom_operations((char *) intern_src);
if (ops == NULL) {
intern_cleanup();
caml_failwith("input_value: unknown custom block identifier");
}
if (code == CODE_CUSTOM_FIXED && ops->fixed_length == NULL) {
intern_cleanup();
caml_failwith("input_value: expected a fixed-size custom block");
}
while (*intern_src++ != 0) /*nothing*/; /*skip identifier*/
if (code == CODE_CUSTOM) {
/* deprecated */
size = ops->deserialize((void *) (intern_dest + 2));
} else {
uintnat expected_size;
#ifdef ARCH_SIXTYFOUR
if (code == CODE_CUSTOM_FIXED) {
expected_size = ops->fixed_length->bsize_64;
} else {
intern_src += 4;
expected_size = read64u();
}
#else
if (code == CODE_CUSTOM_FIXED) {
expected_size = ops->fixed_length->bsize_32;
} else {
expected_size = read32u();
intern_src += 8;
}
#endif
size = ops->deserialize((void *) (intern_dest + 2));
if (size != expected_size) {
intern_cleanup();
caml_failwith(
"input_value: incorrect length of serialized custom block");
}
}
size = 1 + (size + sizeof(value) - 1) / sizeof(value);
v = Val_hp(intern_dest);
if (intern_obj_table != NULL) intern_obj_table[obj_counter++] = v;
*intern_dest = Make_header_allocated_here(size, Custom_tag,
intern_color);
Custom_ops_val(v) = ops;
if (ops->finalize != NULL && Is_young(v)) {
/* Remember that the block has a finalizer. */
add_to_custom_table (&caml_custom_table, v, 0, 1);
}
intern_dest += 1 + size;
break;
}
default:
intern_cleanup();
caml_failwith("input_value: ill-formed message");
}
}
}
/* end of case OReadItems */
*dest = v;
break;
default:
CAMLassert(0);
}
}
/* We are done. Cleanup the stack and leave the function */
intern_free_stack();
}
static void intern_alloc(mlsize_t whsize, mlsize_t num_objects,
int outside_heap)
{
mlsize_t wosize;
if (whsize == 0) {
CAMLassert (intern_extra_block == NULL && intern_block == 0
&& intern_obj_table == NULL);
return;
}
wosize = Wosize_whsize(whsize);
if (outside_heap || wosize > Max_wosize) {
/* Round desired size up to next page */
asize_t request =
((Bsize_wsize(whsize) + Page_size - 1) >> Page_log) << Page_log;
intern_extra_block = caml_alloc_for_heap(request);
if (intern_extra_block == NULL) {
intern_cleanup();
caml_raise_out_of_memory();
}
intern_color =
outside_heap ? Caml_black : caml_allocation_color(intern_extra_block);
intern_dest = (header_t *) intern_extra_block;
CAMLassert (intern_block == 0);
} else {
/* this is a specialised version of caml_alloc from alloc.c */
if (wosize <= Max_young_wosize){
if (wosize == 0){
intern_block = Atom (String_tag);
} else {
intern_block = caml_alloc_small (wosize, String_tag);
}
}else{
intern_block = caml_alloc_shr_no_raise (wosize, String_tag);
/* do not do the urgent_gc check here because it might darken
intern_block into gray and break the intern_color assertion below */
if (intern_block == 0) {
intern_cleanup();
caml_raise_out_of_memory();
}
}
intern_header = Hd_val(intern_block);
intern_color = Color_hd(intern_header);
CAMLassert (intern_color == Caml_white || intern_color == Caml_black);
intern_dest = (header_t *) Hp_val(intern_block);
CAMLassert (intern_extra_block == NULL);
}
obj_counter = 0;
if (num_objects > 0) {
intern_obj_table =
(value *) caml_stat_alloc_noexc(num_objects * sizeof(value));
if (intern_obj_table == NULL) {
intern_cleanup();
caml_raise_out_of_memory();
}
} else
CAMLassert(intern_obj_table == NULL);
}
static void intern_add_to_heap(mlsize_t whsize)
{
/* Add new heap chunk to heap if needed */
if (intern_extra_block != NULL) {
/* If heap chunk not filled totally, build free block at end */
asize_t request = Chunk_size (intern_extra_block);
header_t * end_extra_block =
(header_t *) intern_extra_block + Wsize_bsize(request);
CAMLassert(intern_block == 0);
CAMLassert(intern_dest <= end_extra_block);
if (intern_dest < end_extra_block){
caml_make_free_blocks ((value *) intern_dest,
end_extra_block - intern_dest, 0, Caml_white);
}
caml_allocated_words +=
Wsize_bsize ((char *) intern_dest - intern_extra_block);
caml_add_to_heap(intern_extra_block);
intern_extra_block = NULL; // To prevent intern_cleanup freeing it
} else {
intern_block = 0; // To prevent intern_cleanup rewriting its header
}
}
/* Parsing the header */
struct marshal_header {
uint32_t magic;
int header_len;
uintnat data_len;
uintnat num_objects;
uintnat whsize;
};
static void caml_parse_header(char * fun_name,
/*out*/ struct marshal_header * h)
{
char errmsg[100];
h->magic = read32u();
switch(h->magic) {
case Intext_magic_number_small:
h->header_len = 20;
h->data_len = read32u();
h->num_objects = read32u();
#ifdef ARCH_SIXTYFOUR
read32u();
h->whsize = read32u();
#else
h->whsize = read32u();
read32u();
#endif
break;
case Intext_magic_number_big:
#ifdef ARCH_SIXTYFOUR
h->header_len = 32;
read32u();
h->data_len = read64u();
h->num_objects = read64u();
h->whsize = read64u();
#else
errmsg[sizeof(errmsg) - 1] = 0;
snprintf(errmsg, sizeof(errmsg) - 1,
"%s: object too large to be read back on a 32-bit platform",
fun_name);
caml_failwith(errmsg);
#endif
break;
default:
errmsg[sizeof(errmsg) - 1] = 0;
snprintf(errmsg, sizeof(errmsg) - 1,
"%s: bad object",
fun_name);
caml_failwith(errmsg);
}
}
/* Reading from a channel */
static value caml_input_val_core(struct channel *chan, int outside_heap)
{
intnat r;
char header[32];
struct marshal_header h;
char * block;
value res;
if (! caml_channel_binary_mode(chan))
caml_failwith("input_value: not a binary channel");
/* Read and parse the header */
r = caml_really_getblock(chan, header, 20);
if (r == 0)
caml_raise_end_of_file();
else if (r < 20)
caml_failwith("input_value: truncated object");
intern_src = (unsigned char *) header;
if (read32u() == Intext_magic_number_big) {
/* Finish reading the header */
if (caml_really_getblock(chan, header + 20, 32 - 20) < 32 - 20)
caml_failwith("input_value: truncated object");
}
intern_src = (unsigned char *) header;
caml_parse_header("input_value", &h);
/* Read block from channel */
block = caml_stat_alloc(h.data_len);
/* During [caml_really_getblock], concurrent [caml_input_val] operations
can take place (via signal handlers or context switching in systhreads),
and [intern_input] may change. So, wait until [caml_really_getblock]
is over before using [intern_input] and the other global vars. */
if (caml_really_getblock(chan, block, h.data_len) < h.data_len) {
caml_stat_free(block);
caml_failwith("input_value: truncated object");
}
/* Initialize global state */
intern_init(block, block);
intern_alloc(h.whsize, h.num_objects, outside_heap);
/* Fill it in */
intern_rec(&res);
if (!outside_heap) {
intern_add_to_heap(h.whsize);
} else {
caml_disown_for_heap(intern_extra_block);
intern_extra_block = NULL;
intern_block = 0;
}
/* Free everything */
intern_cleanup();
return caml_check_urgent_gc(res);
}
value caml_input_val(struct channel* chan)
{
return caml_input_val_core(chan, 0);
}
CAMLprim value caml_input_value(value vchan)
{
CAMLparam1 (vchan);
struct channel * chan = Channel(vchan);
CAMLlocal1 (res);
Lock(chan);
res = caml_input_val(chan);
Unlock(chan);
CAMLreturn (res);
}
/* Reading from memory-resident blocks */
CAMLprim value caml_input_value_to_outside_heap(value vchan)
{
CAMLparam1 (vchan);
struct channel * chan = Channel(vchan);
CAMLlocal1 (res);
Lock(chan);
res = caml_input_val_core(chan, 1);
Unlock(chan);
CAMLreturn (res);
}
CAMLexport value caml_input_val_from_bytes(value str, intnat ofs)
{
CAMLparam1 (str);
CAMLlocal1 (obj);
struct marshal_header h;
/* Initialize global state */
intern_init(&Byte_u(str, ofs), NULL);
caml_parse_header("input_val_from_string", &h);
if (ofs + h.header_len + h.data_len > caml_string_length(str))
caml_failwith("input_val_from_string: bad length");
/* Allocate result */
intern_alloc(h.whsize, h.num_objects, 0);
intern_src = &Byte_u(str, ofs + h.header_len); /* If a GC occurred */
/* Fill it in */
intern_rec(&obj);
intern_add_to_heap(h.whsize);
/* Free everything */
intern_cleanup();
CAMLreturn (caml_check_urgent_gc(obj));
}
CAMLprim value caml_input_value_from_string(value str, value ofs)
{
return caml_input_val_from_bytes(str, Long_val(ofs));
}
CAMLprim value caml_input_value_from_bytes(value str, value ofs)
{
return caml_input_val_from_bytes(str, Long_val(ofs));
}
static value input_val_from_block(struct marshal_header * h)
{
value obj;
/* Allocate result */
intern_alloc(h->whsize, h->num_objects, 0);
/* Fill it in */
intern_rec(&obj);
intern_add_to_heap(h->whsize);
/* Free internal data structures */
intern_cleanup();
return caml_check_urgent_gc(obj);
}
CAMLexport value caml_input_value_from_malloc(char * data, intnat ofs)
{
struct marshal_header h;
intern_init(data + ofs, data);
caml_parse_header("input_value_from_malloc", &h);
return input_val_from_block(&h);
}
/* [len] is a number of bytes */
CAMLexport value caml_input_value_from_block(char * data, intnat len)
{
struct marshal_header h;
/* Initialize global state */
intern_init(data, NULL);
caml_parse_header("input_value_from_block", &h);
if (h.header_len + h.data_len > len)
caml_failwith("input_val_from_block: bad length");
return input_val_from_block(&h);
}
/* [ofs] is a [value] that represents a number of bytes
result is a [value] that represents a number of bytes
To handle both the small and the big format,
we assume 20 bytes are available at [buff + ofs],
and we return the data size + the length of the part of the header
that remains to be read. */
CAMLprim value caml_marshal_data_size(value buff, value ofs)
{
uint32_t magic;
int header_len;
uintnat data_len;
intern_src = &Byte_u(buff, Long_val(ofs));
magic = read32u();
switch(magic) {
case Intext_magic_number_small:
header_len = 20;
data_len = read32u();
break;
case Intext_magic_number_big:
#ifdef ARCH_SIXTYFOUR
header_len = 32;
read32u();
data_len = read64u();
#else
caml_failwith("Marshal.data_size: "
"object too large to be read back on a 32-bit platform");
#endif
break;
default:
caml_failwith("Marshal.data_size: bad object");
}
return Val_long((header_len - 20) + data_len);
}
/* Resolution of code pointers */
static char * intern_resolve_code_pointer(unsigned char digest[16],
asize_t offset)
{
int i;
for (i = caml_code_fragments_table.size - 1; i >= 0; i--) {
struct code_fragment * cf = caml_code_fragments_table.contents[i];
if (! cf->digest_computed) {
caml_md5_block(cf->digest, cf->code_start, cf->code_end - cf->code_start);
cf->digest_computed = 1;
}
if (memcmp(digest, cf->digest, 16) == 0) {
if (cf->code_start + offset < cf->code_end)
return cf->code_start + offset;
else
return NULL;
}
}
return NULL;
}
static void intern_bad_code_pointer(unsigned char digest[16])
{
char msg[256];
snprintf(msg, sizeof(msg),
"input_value: unknown code module "
"%02X%02X%02X%02X%02X%02X%02X%02X"
"%02X%02X%02X%02X%02X%02X%02X%02X",
digest[0], digest[1], digest[2], digest[3],
digest[4], digest[5], digest[6], digest[7],
digest[8], digest[9], digest[10], digest[11],
digest[12], digest[13], digest[14], digest[15]);
caml_failwith(msg);
}
/* Functions for writing user-defined marshallers */
CAMLexport int caml_deserialize_uint_1(void)
{
return read8u();
}
CAMLexport int caml_deserialize_sint_1(void)
{
return read8s();
}
CAMLexport int caml_deserialize_uint_2(void)
{
return read16u();
}
CAMLexport int caml_deserialize_sint_2(void)
{
return read16s();
}
CAMLexport uint32_t caml_deserialize_uint_4(void)
{
return read32u();
}
CAMLexport int32_t caml_deserialize_sint_4(void)
{
return read32s();
}
CAMLexport uint64_t caml_deserialize_uint_8(void)
{
uint64_t i;
caml_deserialize_block_8(&i, 1);
return i;
}
CAMLexport int64_t caml_deserialize_sint_8(void)
{
int64_t i;