Annotation of OpenXM_contrib2/asir2000/gc/typd_mlc.c, Revision 1.1.1.1
1.1 noro 1: /*
2: * Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
3: *
4: * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
5: * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
6: *
7: * Permission is hereby granted to use or copy this program
8: * for any purpose, provided the above notices are retained on all copies.
9: * Permission to modify the code and to distribute modified code is granted,
10: * provided the above notices are retained, and a notice that the code was
11: * modified is included with the above copyright notice.
12: *
13: */
14: /* Boehm, July 31, 1995 5:02 pm PDT */
15:
16:
17: /*
18: * Some simple primitives for allocation with explicit type information.
19: * Simple objects are allocated such that they contain a GC_descr at the
20: * end (in the last allocated word). This descriptor may be a procedure
21: * which then examines an extended descriptor passed as its environment.
22: *
23: * Arrays are treated as simple objects if they have sufficiently simple
24: * structure. Otherwise they are allocated from an array kind that supplies
25: * a special mark procedure. These arrays contain a pointer to a
26: * complex_descriptor as their last word.
27: * This is done because the environment field is too small, and the collector
28: * must trace the complex_descriptor.
29: *
30: * Note that descriptors inside objects may appear cleared, if we encounter a
31: * false refrence to an object on a free list. In the GC_descr case, this
32: * is OK, since a 0 descriptor corresponds to examining no fields.
33: * In the complex_descriptor case, we explicitly check for that case.
34: *
35: * MAJOR PARTS OF THIS CODE HAVE NOT BEEN TESTED AT ALL and are not testable,
36: * since they are not accessible through the current interface.
37: */
38:
39: #include "gc_priv.h"
40: #include "gc_mark.h"
41: #include "gc_typed.h"
42:
43: # ifdef ADD_BYTE_AT_END
44: # define EXTRA_BYTES (sizeof(word) - 1)
45: # else
46: # define EXTRA_BYTES (sizeof(word))
47: # endif
48:
49: GC_bool GC_explicit_typing_initialized = FALSE;
50:
51: int GC_explicit_kind; /* Object kind for objects with indirect */
52: /* (possibly extended) descriptors. */
53:
54: int GC_array_kind; /* Object kind for objects with complex */
55: /* descriptors and GC_array_mark_proc. */
56:
57: /* Extended descriptors. GC_typed_mark_proc understands these. */
58: /* These are used for simple objects that are larger than what */
59: /* can be described by a BITMAP_BITS sized bitmap. */
60: typedef struct {
61: word ed_bitmap; /* lsb corresponds to first word. */
62: GC_bool ed_continued; /* next entry is continuation. */
63: } ext_descr;
64:
65: /* Array descriptors. GC_array_mark_proc understands these. */
66: /* We may eventually need to add provisions for headers and */
67: /* trailers. Hence we provide for tree structured descriptors, */
68: /* though we don't really use them currently. */
69: typedef union ComplexDescriptor {
70: struct LeafDescriptor { /* Describes simple array */
71: word ld_tag;
72: # define LEAF_TAG 1
73: word ld_size; /* bytes per element */
74: /* multiple of ALIGNMENT */
75: word ld_nelements; /* Number of elements. */
76: GC_descr ld_descriptor; /* A simple length, bitmap, */
77: /* or procedure descriptor. */
78: } ld;
79: struct ComplexArrayDescriptor {
80: word ad_tag;
81: # define ARRAY_TAG 2
82: word ad_nelements;
83: union ComplexDescriptor * ad_element_descr;
84: } ad;
85: struct SequenceDescriptor {
86: word sd_tag;
87: # define SEQUENCE_TAG 3
88: union ComplexDescriptor * sd_first;
89: union ComplexDescriptor * sd_second;
90: } sd;
91: } complex_descriptor;
92: #define TAG ld.ld_tag
93:
94: ext_descr * GC_ext_descriptors; /* Points to array of extended */
95: /* descriptors. */
96:
97: word GC_ed_size = 0; /* Current size of above arrays. */
98: # define ED_INITIAL_SIZE 100;
99:
100: word GC_avail_descr = 0; /* Next available slot. */
101:
102: int GC_typed_mark_proc_index; /* Indices of my mark */
103: int GC_array_mark_proc_index; /* procedures. */
104:
105: /* Add a multiword bitmap to GC_ext_descriptors arrays. Return */
106: /* starting index. */
107: /* Returns -1 on failure. */
108: /* Caller does not hold allocation lock. */
109: signed_word GC_add_ext_descriptor(bm, nbits)
110: GC_bitmap bm;
111: word nbits;
112: {
113: register size_t nwords = divWORDSZ(nbits + WORDSZ-1);
114: register signed_word result;
115: register word i;
116: register word last_part;
117: register int extra_bits;
118: DCL_LOCK_STATE;
119:
120: DISABLE_SIGNALS();
121: LOCK();
122: while (GC_avail_descr + nwords >= GC_ed_size) {
123: ext_descr * new;
124: size_t new_size;
125: word ed_size = GC_ed_size;
126:
127: UNLOCK();
128: ENABLE_SIGNALS();
129: if (ed_size == 0) {
130: new_size = ED_INITIAL_SIZE;
131: } else {
132: new_size = 2 * ed_size;
133: if (new_size > MAX_ENV) return(-1);
134: }
135: new = (ext_descr *) GC_malloc_atomic(new_size * sizeof(ext_descr));
136: if (new == 0) return(-1);
137: DISABLE_SIGNALS();
138: LOCK();
139: if (ed_size == GC_ed_size) {
140: if (GC_avail_descr != 0) {
141: BCOPY(GC_ext_descriptors, new,
142: GC_avail_descr * sizeof(ext_descr));
143: }
144: GC_ed_size = new_size;
145: GC_ext_descriptors = new;
146: } /* else another thread already resized it in the meantime */
147: }
148: result = GC_avail_descr;
149: for (i = 0; i < nwords-1; i++) {
150: GC_ext_descriptors[result + i].ed_bitmap = bm[i];
151: GC_ext_descriptors[result + i].ed_continued = TRUE;
152: }
153: last_part = bm[i];
154: /* Clear irrelevant bits. */
155: extra_bits = nwords * WORDSZ - nbits;
156: last_part <<= extra_bits;
157: last_part >>= extra_bits;
158: GC_ext_descriptors[result + i].ed_bitmap = last_part;
159: GC_ext_descriptors[result + i].ed_continued = FALSE;
160: GC_avail_descr += nwords;
161: UNLOCK();
162: ENABLE_SIGNALS();
163: return(result);
164: }
165:
166: /* Table of bitmap descriptors for n word long all pointer objects. */
167: GC_descr GC_bm_table[WORDSZ/2];
168:
169: /* Return a descriptor for the concatenation of 2 nwords long objects, */
170: /* each of which is described by descriptor. */
171: /* The result is known to be short enough to fit into a bitmap */
172: /* descriptor. */
173: /* Descriptor is a DS_LENGTH or DS_BITMAP descriptor. */
174: GC_descr GC_double_descr(descriptor, nwords)
175: register GC_descr descriptor;
176: register word nwords;
177: {
178: if (descriptor && DS_TAGS == DS_LENGTH) {
179: descriptor = GC_bm_table[BYTES_TO_WORDS((word)descriptor)];
180: };
181: descriptor |= (descriptor & ~DS_TAGS) >> nwords;
182: return(descriptor);
183: }
184:
185: complex_descriptor * GC_make_sequence_descriptor();
186:
187: /* Build a descriptor for an array with nelements elements, */
188: /* each of which can be described by a simple descriptor. */
189: /* We try to optimize some common cases. */
190: /* If the result is COMPLEX, then a complex_descr* is returned */
191: /* in *complex_d. */
192: /* If the result is LEAF, then we built a LeafDescriptor in */
193: /* the structure pointed to by leaf. */
194: /* The tag in the leaf structure is not set. */
195: /* If the result is SIMPLE, then a GC_descr */
196: /* is returned in *simple_d. */
197: /* If the result is NO_MEM, then */
198: /* we failed to allocate the descriptor. */
199: /* The implementation knows that DS_LENGTH is 0. */
200: /* *leaf, *complex_d, and *simple_d may be used as temporaries */
201: /* during the construction. */
202: # define COMPLEX 2
203: # define LEAF 1
204: # define SIMPLE 0
205: # define NO_MEM (-1)
206: int GC_make_array_descriptor(nelements, size, descriptor,
207: simple_d, complex_d, leaf)
208: word size;
209: word nelements;
210: GC_descr descriptor;
211: GC_descr *simple_d;
212: complex_descriptor **complex_d;
213: struct LeafDescriptor * leaf;
214: {
215: # define OPT_THRESHOLD 50
216: /* For larger arrays, we try to combine descriptors of adjacent */
217: /* descriptors to speed up marking, and to reduce the amount */
218: /* of space needed on the mark stack. */
219: if ((descriptor & DS_TAGS) == DS_LENGTH) {
220: if ((word)descriptor == size) {
221: *simple_d = nelements * descriptor;
222: return(SIMPLE);
223: } else if ((word)descriptor == 0) {
224: *simple_d = (GC_descr)0;
225: return(SIMPLE);
226: }
227: }
228: if (nelements <= OPT_THRESHOLD) {
229: if (nelements <= 1) {
230: if (nelements == 1) {
231: *simple_d = descriptor;
232: return(SIMPLE);
233: } else {
234: *simple_d = (GC_descr)0;
235: return(SIMPLE);
236: }
237: }
238: } else if (size <= BITMAP_BITS/2
239: && (descriptor & DS_TAGS) != DS_PROC
240: && (size & (sizeof(word)-1)) == 0) {
241: int result =
242: GC_make_array_descriptor(nelements/2, 2*size,
243: GC_double_descr(descriptor,
244: BYTES_TO_WORDS(size)),
245: simple_d, complex_d, leaf);
246: if ((nelements & 1) == 0) {
247: return(result);
248: } else {
249: struct LeafDescriptor * one_element =
250: (struct LeafDescriptor *)
251: GC_malloc_atomic(sizeof(struct LeafDescriptor));
252:
253: if (result == NO_MEM || one_element == 0) return(NO_MEM);
254: one_element -> ld_tag = LEAF_TAG;
255: one_element -> ld_size = size;
256: one_element -> ld_nelements = 1;
257: one_element -> ld_descriptor = descriptor;
258: switch(result) {
259: case SIMPLE:
260: {
261: struct LeafDescriptor * beginning =
262: (struct LeafDescriptor *)
263: GC_malloc_atomic(sizeof(struct LeafDescriptor));
264: if (beginning == 0) return(NO_MEM);
265: beginning -> ld_tag = LEAF_TAG;
266: beginning -> ld_size = size;
267: beginning -> ld_nelements = 1;
268: beginning -> ld_descriptor = *simple_d;
269: *complex_d = GC_make_sequence_descriptor(
270: (complex_descriptor *)beginning,
271: (complex_descriptor *)one_element);
272: break;
273: }
274: case LEAF:
275: {
276: struct LeafDescriptor * beginning =
277: (struct LeafDescriptor *)
278: GC_malloc_atomic(sizeof(struct LeafDescriptor));
279: if (beginning == 0) return(NO_MEM);
280: beginning -> ld_tag = LEAF_TAG;
281: beginning -> ld_size = leaf -> ld_size;
282: beginning -> ld_nelements = leaf -> ld_nelements;
283: beginning -> ld_descriptor = leaf -> ld_descriptor;
284: *complex_d = GC_make_sequence_descriptor(
285: (complex_descriptor *)beginning,
286: (complex_descriptor *)one_element);
287: break;
288: }
289: case COMPLEX:
290: *complex_d = GC_make_sequence_descriptor(
291: *complex_d,
292: (complex_descriptor *)one_element);
293: break;
294: }
295: return(COMPLEX);
296: }
297: }
298: {
299: leaf -> ld_size = size;
300: leaf -> ld_nelements = nelements;
301: leaf -> ld_descriptor = descriptor;
302: return(LEAF);
303: }
304: }
305:
306: complex_descriptor * GC_make_sequence_descriptor(first, second)
307: complex_descriptor * first;
308: complex_descriptor * second;
309: {
310: struct SequenceDescriptor * result =
311: (struct SequenceDescriptor *)
312: GC_malloc(sizeof(struct SequenceDescriptor));
313: /* Can't result in overly conservative marking, since tags are */
314: /* very small integers. Probably faster than maintaining type */
315: /* info. */
316: if (result != 0) {
317: result -> sd_tag = SEQUENCE_TAG;
318: result -> sd_first = first;
319: result -> sd_second = second;
320: }
321: return((complex_descriptor *)result);
322: }
323:
324: #ifdef UNDEFINED
325: complex_descriptor * GC_make_complex_array_descriptor(nelements, descr)
326: word nelements;
327: complex_descriptor * descr;
328: {
329: struct ComplexArrayDescriptor * result =
330: (struct ComplexArrayDescriptor *)
331: GC_malloc(sizeof(struct ComplexArrayDescriptor));
332:
333: if (result != 0) {
334: result -> ad_tag = ARRAY_TAG;
335: result -> ad_nelements = nelements;
336: result -> ad_element_descr = descr;
337: }
338: return((complex_descriptor *)result);
339: }
340: #endif
341:
342: ptr_t * GC_eobjfreelist;
343:
344: ptr_t * GC_arobjfreelist;
345:
346: mse * GC_typed_mark_proc();
347:
348: mse * GC_array_mark_proc();
349:
350: GC_descr GC_generic_array_descr;
351:
352: /* Caller does not hold allocation lock. */
353: void GC_init_explicit_typing()
354: {
355: register int i;
356: DCL_LOCK_STATE;
357:
358:
359: # ifdef PRINTSTATS
360: if (sizeof(struct LeafDescriptor) % sizeof(word) != 0)
361: ABORT("Bad leaf descriptor size");
362: # endif
363: DISABLE_SIGNALS();
364: LOCK();
365: if (GC_explicit_typing_initialized) {
366: UNLOCK();
367: ENABLE_SIGNALS();
368: return;
369: }
370: GC_explicit_typing_initialized = TRUE;
371: /* Set up object kind with simple indirect descriptor. */
372: GC_eobjfreelist = (ptr_t *)
373: GC_generic_malloc_inner((MAXOBJSZ+1)*sizeof(ptr_t), PTRFREE);
374: if (GC_eobjfreelist == 0) ABORT("Couldn't allocate GC_eobjfreelist");
375: BZERO(GC_eobjfreelist, (MAXOBJSZ+1)*sizeof(ptr_t));
376: GC_explicit_kind = GC_n_kinds++;
377: GC_obj_kinds[GC_explicit_kind].ok_freelist = GC_eobjfreelist;
378: GC_obj_kinds[GC_explicit_kind].ok_reclaim_list = 0;
379: GC_obj_kinds[GC_explicit_kind].ok_descriptor =
380: (((word)WORDS_TO_BYTES(-1)) | DS_PER_OBJECT);
381: GC_obj_kinds[GC_explicit_kind].ok_relocate_descr = TRUE;
382: GC_obj_kinds[GC_explicit_kind].ok_init = TRUE;
383: /* Descriptors are in the last word of the object. */
384: GC_typed_mark_proc_index = GC_n_mark_procs;
385: GC_mark_procs[GC_typed_mark_proc_index] = GC_typed_mark_proc;
386: GC_n_mark_procs++;
387: /* Moving this up breaks DEC AXP compiler. */
388: /* Set up object kind with array descriptor. */
389: GC_arobjfreelist = (ptr_t *)
390: GC_generic_malloc_inner((MAXOBJSZ+1)*sizeof(ptr_t), PTRFREE);
391: if (GC_arobjfreelist == 0) ABORT("Couldn't allocate GC_arobjfreelist");
392: BZERO(GC_arobjfreelist, (MAXOBJSZ+1)*sizeof(ptr_t));
393: if (GC_n_mark_procs >= MAX_MARK_PROCS)
394: ABORT("No slot for array mark proc");
395: GC_array_mark_proc_index = GC_n_mark_procs++;
396: if (GC_n_kinds >= MAXOBJKINDS)
397: ABORT("No kind available for array objects");
398: GC_array_kind = GC_n_kinds++;
399: GC_obj_kinds[GC_array_kind].ok_freelist = GC_arobjfreelist;
400: GC_obj_kinds[GC_array_kind].ok_reclaim_list = 0;
401: GC_obj_kinds[GC_array_kind].ok_descriptor =
402: MAKE_PROC(GC_array_mark_proc_index, 0);;
403: GC_obj_kinds[GC_array_kind].ok_relocate_descr = FALSE;
404: GC_obj_kinds[GC_array_kind].ok_init = TRUE;
405: /* Descriptors are in the last word of the object. */
406: GC_mark_procs[GC_array_mark_proc_index] = GC_array_mark_proc;
407: for (i = 0; i < WORDSZ/2; i++) {
408: GC_descr d = (((word)(-1)) >> (WORDSZ - i)) << (WORDSZ - i);
409: d |= DS_BITMAP;
410: GC_bm_table[i] = d;
411: }
412: GC_generic_array_descr = MAKE_PROC(GC_array_mark_proc_index, 0);
413: UNLOCK();
414: ENABLE_SIGNALS();
415: }
416:
417: mse * GC_typed_mark_proc(addr, mark_stack_ptr, mark_stack_limit, env)
418: register word * addr;
419: register mse * mark_stack_ptr;
420: mse * mark_stack_limit;
421: word env;
422: {
423: register word bm = GC_ext_descriptors[env].ed_bitmap;
424: register word * current_p = addr;
425: register word current;
426: register ptr_t greatest_ha = GC_greatest_plausible_heap_addr;
427: register ptr_t least_ha = GC_least_plausible_heap_addr;
428:
429: for (; bm != 0; bm >>= 1, current_p++) {
430: if (bm & 1) {
431: current = *current_p;
432: if ((ptr_t)current >= least_ha && (ptr_t)current <= greatest_ha) {
433: PUSH_CONTENTS(current, mark_stack_ptr,
434: mark_stack_limit, current_p, exit1);
435: }
436: }
437: }
438: if (GC_ext_descriptors[env].ed_continued) {
439: /* Push an entry with the rest of the descriptor back onto the */
440: /* stack. Thus we never do too much work at once. Note that */
441: /* we also can't overflow the mark stack unless we actually */
442: /* mark something. */
443: mark_stack_ptr++;
444: if (mark_stack_ptr >= mark_stack_limit) {
445: mark_stack_ptr = GC_signal_mark_stack_overflow(mark_stack_ptr);
446: }
447: mark_stack_ptr -> mse_start = addr + WORDSZ;
448: mark_stack_ptr -> mse_descr =
449: MAKE_PROC(GC_typed_mark_proc_index, env+1);
450: }
451: return(mark_stack_ptr);
452: }
453:
454: /* Return the size of the object described by d. It would be faster to */
455: /* store this directly, or to compute it as part of */
456: /* GC_push_complex_descriptor, but hopefully it doesn't matter. */
457: word GC_descr_obj_size(d)
458: register complex_descriptor *d;
459: {
460: switch(d -> TAG) {
461: case LEAF_TAG:
462: return(d -> ld.ld_nelements * d -> ld.ld_size);
463: case ARRAY_TAG:
464: return(d -> ad.ad_nelements
465: * GC_descr_obj_size(d -> ad.ad_element_descr));
466: case SEQUENCE_TAG:
467: return(GC_descr_obj_size(d -> sd.sd_first)
468: + GC_descr_obj_size(d -> sd.sd_second));
469: default:
470: ABORT("Bad complex descriptor");
471: /*NOTREACHED*/ return 0; /*NOTREACHED*/
472: }
473: }
474:
475: /* Push descriptors for the object at addr with complex descriptor d */
476: /* onto the mark stack. Return 0 if the mark stack overflowed. */
477: mse * GC_push_complex_descriptor(addr, d, msp, msl)
478: word * addr;
479: register complex_descriptor *d;
480: register mse * msp;
481: mse * msl;
482: {
483: register ptr_t current = (ptr_t) addr;
484: register word nelements;
485: register word sz;
486: register word i;
487:
488: switch(d -> TAG) {
489: case LEAF_TAG:
490: {
491: register GC_descr descr = d -> ld.ld_descriptor;
492:
493: nelements = d -> ld.ld_nelements;
494: if (msl - msp <= (ptrdiff_t)nelements) return(0);
495: sz = d -> ld.ld_size;
496: for (i = 0; i < nelements; i++) {
497: msp++;
498: msp -> mse_start = (word *)current;
499: msp -> mse_descr = descr;
500: current += sz;
501: }
502: return(msp);
503: }
504: case ARRAY_TAG:
505: {
506: register complex_descriptor *descr = d -> ad.ad_element_descr;
507:
508: nelements = d -> ad.ad_nelements;
509: sz = GC_descr_obj_size(descr);
510: for (i = 0; i < nelements; i++) {
511: msp = GC_push_complex_descriptor((word *)current, descr,
512: msp, msl);
513: if (msp == 0) return(0);
514: current += sz;
515: }
516: return(msp);
517: }
518: case SEQUENCE_TAG:
519: {
520: sz = GC_descr_obj_size(d -> sd.sd_first);
521: msp = GC_push_complex_descriptor((word *)current, d -> sd.sd_first,
522: msp, msl);
523: if (msp == 0) return(0);
524: current += sz;
525: msp = GC_push_complex_descriptor((word *)current, d -> sd.sd_second,
526: msp, msl);
527: return(msp);
528: }
529: default:
530: ABORT("Bad complex descriptor");
531: /*NOTREACHED*/ return 0; /*NOTREACHED*/
532: }
533: }
534:
535: /*ARGSUSED*/
536: mse * GC_array_mark_proc(addr, mark_stack_ptr, mark_stack_limit, env)
537: register word * addr;
538: register mse * mark_stack_ptr;
539: mse * mark_stack_limit;
540: word env;
541: {
542: register hdr * hhdr = HDR(addr);
543: register word sz = hhdr -> hb_sz;
544: register complex_descriptor * descr = (complex_descriptor *)(addr[sz-1]);
545: mse * orig_mark_stack_ptr = mark_stack_ptr;
546: mse * new_mark_stack_ptr;
547:
548: if (descr == 0) {
549: /* Found a reference to a free list entry. Ignore it. */
550: return(orig_mark_stack_ptr);
551: }
552: /* In use counts were already updated when array descriptor was */
553: /* pushed. Here we only replace it by subobject descriptors, so */
554: /* no update is necessary. */
555: new_mark_stack_ptr = GC_push_complex_descriptor(addr, descr,
556: mark_stack_ptr,
557: mark_stack_limit-1);
558: if (new_mark_stack_ptr == 0) {
559: /* Doesn't fit. Conservatively push the whole array as a unit */
560: /* and request a mark stack expansion. */
561: /* This cannot cause a mark stack overflow, since it replaces */
562: /* the original array entry. */
563: GC_mark_stack_too_small = TRUE;
564: new_mark_stack_ptr = orig_mark_stack_ptr + 1;
565: new_mark_stack_ptr -> mse_start = addr;
566: new_mark_stack_ptr -> mse_descr = WORDS_TO_BYTES(sz) | DS_LENGTH;
567: } else {
568: /* Push descriptor itself */
569: new_mark_stack_ptr++;
570: new_mark_stack_ptr -> mse_start = addr + sz - 1;
571: new_mark_stack_ptr -> mse_descr = sizeof(word) | DS_LENGTH;
572: }
573: return(new_mark_stack_ptr);
574: }
575:
576: #if defined(__STDC__) || defined(__cplusplus)
577: GC_descr GC_make_descriptor(GC_bitmap bm, size_t len)
578: #else
579: GC_descr GC_make_descriptor(bm, len)
580: GC_bitmap bm;
581: size_t len;
582: #endif
583: {
584: register signed_word last_set_bit = len - 1;
585: register word result;
586: register int i;
587: # define HIGH_BIT (((word)1) << (WORDSZ - 1))
588:
589: if (!GC_explicit_typing_initialized) GC_init_explicit_typing();
590: while (last_set_bit >= 0 && !GC_get_bit(bm, last_set_bit)) last_set_bit --;
591: if (last_set_bit < 0) return(0 /* no pointers */);
592: # if ALIGNMENT == CPP_WORDSZ/8
593: {
594: register GC_bool all_bits_set = TRUE;
595: for (i = 0; i < last_set_bit; i++) {
596: if (!GC_get_bit(bm, i)) {
597: all_bits_set = FALSE;
598: break;
599: }
600: }
601: if (all_bits_set) {
602: /* An initial section contains all pointers. Use length descriptor. */
603: return(WORDS_TO_BYTES(last_set_bit+1) | DS_LENGTH);
604: }
605: }
606: # endif
607: if (last_set_bit < BITMAP_BITS) {
608: /* Hopefully the common case. */
609: /* Build bitmap descriptor (with bits reversed) */
610: result = HIGH_BIT;
611: for (i = last_set_bit - 1; i >= 0; i--) {
612: result >>= 1;
613: if (GC_get_bit(bm, i)) result |= HIGH_BIT;
614: }
615: result |= DS_BITMAP;
616: return(result);
617: } else {
618: signed_word index;
619:
620: index = GC_add_ext_descriptor(bm, (word)last_set_bit+1);
621: if (index == -1) return(WORDS_TO_BYTES(last_set_bit+1) | DS_LENGTH);
622: /* Out of memory: use conservative */
623: /* approximation. */
624: result = MAKE_PROC(GC_typed_mark_proc_index, (word)index);
625: return(result);
626: }
627: }
628:
629: ptr_t GC_clear_stack();
630:
631: #define GENERAL_MALLOC(lb,k) \
632: (GC_PTR)GC_clear_stack(GC_generic_malloc((word)lb, k))
633:
634: #define GENERAL_MALLOC_IOP(lb,k) \
635: (GC_PTR)GC_clear_stack(GC_generic_malloc_ignore_off_page(lb, k))
636:
637: #if defined(__STDC__) || defined(__cplusplus)
638: void * GC_malloc_explicitly_typed(size_t lb, GC_descr d)
639: #else
640: char * GC_malloc_explicitly_typed(lb, d)
641: size_t lb;
642: GC_descr d;
643: #endif
644: {
645: register ptr_t op;
646: register ptr_t * opp;
647: register word lw;
648: DCL_LOCK_STATE;
649:
650: lb += EXTRA_BYTES;
651: if( SMALL_OBJ(lb) ) {
652: # ifdef MERGE_SIZES
653: lw = GC_size_map[lb];
654: # else
655: lw = ALIGNED_WORDS(lb);
656: # endif
657: opp = &(GC_eobjfreelist[lw]);
658: FASTLOCK();
659: if( !FASTLOCK_SUCCEEDED() || (op = *opp) == 0 ) {
660: FASTUNLOCK();
661: op = (ptr_t)GENERAL_MALLOC((word)lb, GC_explicit_kind);
662: if (0 == op) return(0);
663: # ifdef MERGE_SIZES
664: lw = GC_size_map[lb]; /* May have been uninitialized. */
665: # endif
666: } else {
667: *opp = obj_link(op);
668: GC_words_allocd += lw;
669: FASTUNLOCK();
670: }
671: } else {
672: op = (ptr_t)GENERAL_MALLOC((word)lb, GC_explicit_kind);
673: if (op != NULL)
674: lw = BYTES_TO_WORDS(GC_size(op));
675: }
676: if (op != NULL)
677: ((word *)op)[lw - 1] = d;
678: return((GC_PTR) op);
679: }
680:
681: #if defined(__STDC__) || defined(__cplusplus)
682: void * GC_malloc_explicitly_typed_ignore_off_page(size_t lb, GC_descr d)
683: #else
684: char * GC_malloc_explicitly_typed_ignore_off_page(lb, d)
685: size_t lb;
686: GC_descr d;
687: #endif
688: {
689: register ptr_t op;
690: register ptr_t * opp;
691: register word lw;
692: DCL_LOCK_STATE;
693:
694: lb += EXTRA_BYTES;
695: if( SMALL_OBJ(lb) ) {
696: # ifdef MERGE_SIZES
697: lw = GC_size_map[lb];
698: # else
699: lw = ALIGNED_WORDS(lb);
700: # endif
701: opp = &(GC_eobjfreelist[lw]);
702: FASTLOCK();
703: if( !FASTLOCK_SUCCEEDED() || (op = *opp) == 0 ) {
704: FASTUNLOCK();
705: op = (ptr_t)GENERAL_MALLOC_IOP(lb, GC_explicit_kind);
706: # ifdef MERGE_SIZES
707: lw = GC_size_map[lb]; /* May have been uninitialized. */
708: # endif
709: } else {
710: *opp = obj_link(op);
711: GC_words_allocd += lw;
712: FASTUNLOCK();
713: }
714: } else {
715: op = (ptr_t)GENERAL_MALLOC_IOP(lb, GC_explicit_kind);
716: if (op != NULL)
717: lw = BYTES_TO_WORDS(GC_size(op));
718: }
719: if (op != NULL)
720: ((word *)op)[lw - 1] = d;
721: return((GC_PTR) op);
722: }
723:
724: #if defined(__STDC__) || defined(__cplusplus)
725: void * GC_calloc_explicitly_typed(size_t n,
726: size_t lb,
727: GC_descr d)
728: #else
729: char * GC_calloc_explicitly_typed(n, lb, d)
730: size_t n;
731: size_t lb;
732: GC_descr d;
733: #endif
734: {
735: register ptr_t op;
736: register ptr_t * opp;
737: register word lw;
738: GC_descr simple_descr;
739: complex_descriptor *complex_descr;
740: register int descr_type;
741: struct LeafDescriptor leaf;
742: DCL_LOCK_STATE;
743:
744: descr_type = GC_make_array_descriptor((word)n, (word)lb, d,
745: &simple_descr, &complex_descr, &leaf);
746: switch(descr_type) {
747: case NO_MEM: return(0);
748: case SIMPLE: return(GC_malloc_explicitly_typed(n*lb, simple_descr));
749: case LEAF:
750: lb *= n;
751: lb += sizeof(struct LeafDescriptor) + EXTRA_BYTES;
752: break;
753: case COMPLEX:
754: lb *= n;
755: lb += EXTRA_BYTES;
756: break;
757: }
758: if( SMALL_OBJ(lb) ) {
759: # ifdef MERGE_SIZES
760: lw = GC_size_map[lb];
761: # else
762: lw = ALIGNED_WORDS(lb);
763: # endif
764: opp = &(GC_arobjfreelist[lw]);
765: FASTLOCK();
766: if( !FASTLOCK_SUCCEEDED() || (op = *opp) == 0 ) {
767: FASTUNLOCK();
768: op = (ptr_t)GENERAL_MALLOC((word)lb, GC_array_kind);
769: if (0 == op) return(0);
770: # ifdef MERGE_SIZES
771: lw = GC_size_map[lb]; /* May have been uninitialized. */
772: # endif
773: } else {
774: *opp = obj_link(op);
775: GC_words_allocd += lw;
776: FASTUNLOCK();
777: }
778: } else {
779: op = (ptr_t)GENERAL_MALLOC((word)lb, GC_array_kind);
780: if (0 == op) return(0);
781: lw = BYTES_TO_WORDS(GC_size(op));
782: }
783: if (descr_type == LEAF) {
784: /* Set up the descriptor inside the object itself. */
785: VOLATILE struct LeafDescriptor * lp =
786: (struct LeafDescriptor *)
787: ((word *)op
788: + lw - (BYTES_TO_WORDS(sizeof(struct LeafDescriptor)) + 1));
789:
790: lp -> ld_tag = LEAF_TAG;
791: lp -> ld_size = leaf.ld_size;
792: lp -> ld_nelements = leaf.ld_nelements;
793: lp -> ld_descriptor = leaf.ld_descriptor;
794: ((VOLATILE word *)op)[lw - 1] = (word)lp;
795: } else {
796: extern unsigned GC_finalization_failures;
797: unsigned ff = GC_finalization_failures;
798:
799: ((word *)op)[lw - 1] = (word)complex_descr;
800: /* Make sure the descriptor is cleared once there is any danger */
801: /* it may have been collected. */
802: (void)
803: GC_general_register_disappearing_link((GC_PTR *)
804: ((word *)op+lw-1),
805: (GC_PTR) op);
806: if (ff != GC_finalization_failures) {
807: /* Couldn't register it due to lack of memory. Punt. */
808: /* This will probably fail too, but gives the recovery code */
809: /* a chance. */
810: return(GC_malloc(n*lb));
811: }
812: }
813: return((GC_PTR) op);
814: }
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