Annotation of OpenXM_contrib2/asir2000/gc/typd_mlc.c, Revision 1.5
1.1 noro 1: /*
2: * Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
1.3 noro 3: * opyright (c) 1999-2000 by Hewlett-Packard Company. All rights reserved.
1.1 noro 4: *
5: * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
6: * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
7: *
8: * Permission is hereby granted to use or copy this program
9: * for any purpose, provided the above notices are retained on all copies.
10: * Permission to modify the code and to distribute modified code is granted,
11: * provided the above notices are retained, and a notice that the code was
12: * modified is included with the above copyright notice.
13: *
14: */
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:
1.3 noro 39: #include "private/gc_pmark.h"
1.1 noro 40: #include "gc_typed.h"
41:
1.3 noro 42: # define TYPD_EXTRA_BYTES (sizeof(word) - EXTRA_BYTES)
1.1 noro 43:
44: GC_bool GC_explicit_typing_initialized = FALSE;
45:
46: int GC_explicit_kind; /* Object kind for objects with indirect */
47: /* (possibly extended) descriptors. */
48:
49: int GC_array_kind; /* Object kind for objects with complex */
50: /* descriptors and GC_array_mark_proc. */
51:
52: /* Extended descriptors. GC_typed_mark_proc understands these. */
53: /* These are used for simple objects that are larger than what */
54: /* can be described by a BITMAP_BITS sized bitmap. */
55: typedef struct {
56: word ed_bitmap; /* lsb corresponds to first word. */
57: GC_bool ed_continued; /* next entry is continuation. */
58: } ext_descr;
59:
60: /* Array descriptors. GC_array_mark_proc understands these. */
61: /* We may eventually need to add provisions for headers and */
62: /* trailers. Hence we provide for tree structured descriptors, */
63: /* though we don't really use them currently. */
64: typedef union ComplexDescriptor {
65: struct LeafDescriptor { /* Describes simple array */
66: word ld_tag;
67: # define LEAF_TAG 1
68: word ld_size; /* bytes per element */
69: /* multiple of ALIGNMENT */
70: word ld_nelements; /* Number of elements. */
71: GC_descr ld_descriptor; /* A simple length, bitmap, */
72: /* or procedure descriptor. */
73: } ld;
74: struct ComplexArrayDescriptor {
75: word ad_tag;
76: # define ARRAY_TAG 2
77: word ad_nelements;
78: union ComplexDescriptor * ad_element_descr;
79: } ad;
80: struct SequenceDescriptor {
81: word sd_tag;
82: # define SEQUENCE_TAG 3
83: union ComplexDescriptor * sd_first;
84: union ComplexDescriptor * sd_second;
85: } sd;
86: } complex_descriptor;
87: #define TAG ld.ld_tag
88:
89: ext_descr * GC_ext_descriptors; /* Points to array of extended */
90: /* descriptors. */
91:
92: word GC_ed_size = 0; /* Current size of above arrays. */
93: # define ED_INITIAL_SIZE 100;
94:
95: word GC_avail_descr = 0; /* Next available slot. */
96:
97: int GC_typed_mark_proc_index; /* Indices of my mark */
98: int GC_array_mark_proc_index; /* procedures. */
99:
100: /* Add a multiword bitmap to GC_ext_descriptors arrays. Return */
101: /* starting index. */
102: /* Returns -1 on failure. */
103: /* Caller does not hold allocation lock. */
104: signed_word GC_add_ext_descriptor(bm, nbits)
105: GC_bitmap bm;
106: word nbits;
107: {
108: register size_t nwords = divWORDSZ(nbits + WORDSZ-1);
109: register signed_word result;
110: register word i;
111: register word last_part;
112: register int extra_bits;
113: DCL_LOCK_STATE;
114:
115: DISABLE_SIGNALS();
116: LOCK();
117: while (GC_avail_descr + nwords >= GC_ed_size) {
118: ext_descr * new;
119: size_t new_size;
120: word ed_size = GC_ed_size;
121:
122: UNLOCK();
123: ENABLE_SIGNALS();
124: if (ed_size == 0) {
125: new_size = ED_INITIAL_SIZE;
126: } else {
127: new_size = 2 * ed_size;
128: if (new_size > MAX_ENV) return(-1);
129: }
130: new = (ext_descr *) GC_malloc_atomic(new_size * sizeof(ext_descr));
131: if (new == 0) return(-1);
132: DISABLE_SIGNALS();
133: LOCK();
134: if (ed_size == GC_ed_size) {
135: if (GC_avail_descr != 0) {
136: BCOPY(GC_ext_descriptors, new,
137: GC_avail_descr * sizeof(ext_descr));
138: }
139: GC_ed_size = new_size;
140: GC_ext_descriptors = new;
141: } /* else another thread already resized it in the meantime */
142: }
143: result = GC_avail_descr;
144: for (i = 0; i < nwords-1; i++) {
145: GC_ext_descriptors[result + i].ed_bitmap = bm[i];
146: GC_ext_descriptors[result + i].ed_continued = TRUE;
147: }
148: last_part = bm[i];
149: /* Clear irrelevant bits. */
150: extra_bits = nwords * WORDSZ - nbits;
151: last_part <<= extra_bits;
152: last_part >>= extra_bits;
153: GC_ext_descriptors[result + i].ed_bitmap = last_part;
154: GC_ext_descriptors[result + i].ed_continued = FALSE;
155: GC_avail_descr += nwords;
156: UNLOCK();
157: ENABLE_SIGNALS();
158: return(result);
159: }
160:
161: /* Table of bitmap descriptors for n word long all pointer objects. */
162: GC_descr GC_bm_table[WORDSZ/2];
163:
164: /* Return a descriptor for the concatenation of 2 nwords long objects, */
165: /* each of which is described by descriptor. */
166: /* The result is known to be short enough to fit into a bitmap */
167: /* descriptor. */
1.3 noro 168: /* Descriptor is a GC_DS_LENGTH or GC_DS_BITMAP descriptor. */
1.1 noro 169: GC_descr GC_double_descr(descriptor, nwords)
170: register GC_descr descriptor;
171: register word nwords;
172: {
1.3 noro 173: if ((descriptor & GC_DS_TAGS) == GC_DS_LENGTH) {
1.1 noro 174: descriptor = GC_bm_table[BYTES_TO_WORDS((word)descriptor)];
175: };
1.3 noro 176: descriptor |= (descriptor & ~GC_DS_TAGS) >> nwords;
1.1 noro 177: return(descriptor);
178: }
179:
180: complex_descriptor * GC_make_sequence_descriptor();
181:
182: /* Build a descriptor for an array with nelements elements, */
183: /* each of which can be described by a simple descriptor. */
184: /* We try to optimize some common cases. */
185: /* If the result is COMPLEX, then a complex_descr* is returned */
186: /* in *complex_d. */
187: /* If the result is LEAF, then we built a LeafDescriptor in */
188: /* the structure pointed to by leaf. */
189: /* The tag in the leaf structure is not set. */
190: /* If the result is SIMPLE, then a GC_descr */
191: /* is returned in *simple_d. */
192: /* If the result is NO_MEM, then */
193: /* we failed to allocate the descriptor. */
1.3 noro 194: /* The implementation knows that GC_DS_LENGTH is 0. */
1.1 noro 195: /* *leaf, *complex_d, and *simple_d may be used as temporaries */
196: /* during the construction. */
197: # define COMPLEX 2
198: # define LEAF 1
199: # define SIMPLE 0
200: # define NO_MEM (-1)
201: int GC_make_array_descriptor(nelements, size, descriptor,
202: simple_d, complex_d, leaf)
203: word size;
204: word nelements;
205: GC_descr descriptor;
206: GC_descr *simple_d;
207: complex_descriptor **complex_d;
208: struct LeafDescriptor * leaf;
209: {
210: # define OPT_THRESHOLD 50
211: /* For larger arrays, we try to combine descriptors of adjacent */
212: /* descriptors to speed up marking, and to reduce the amount */
213: /* of space needed on the mark stack. */
1.3 noro 214: if ((descriptor & GC_DS_TAGS) == GC_DS_LENGTH) {
1.1 noro 215: if ((word)descriptor == size) {
216: *simple_d = nelements * descriptor;
217: return(SIMPLE);
218: } else if ((word)descriptor == 0) {
219: *simple_d = (GC_descr)0;
220: return(SIMPLE);
221: }
222: }
223: if (nelements <= OPT_THRESHOLD) {
224: if (nelements <= 1) {
225: if (nelements == 1) {
226: *simple_d = descriptor;
227: return(SIMPLE);
228: } else {
229: *simple_d = (GC_descr)0;
230: return(SIMPLE);
231: }
232: }
233: } else if (size <= BITMAP_BITS/2
1.3 noro 234: && (descriptor & GC_DS_TAGS) != GC_DS_PROC
1.1 noro 235: && (size & (sizeof(word)-1)) == 0) {
236: int result =
237: GC_make_array_descriptor(nelements/2, 2*size,
238: GC_double_descr(descriptor,
239: BYTES_TO_WORDS(size)),
240: simple_d, complex_d, leaf);
241: if ((nelements & 1) == 0) {
242: return(result);
243: } else {
244: struct LeafDescriptor * one_element =
245: (struct LeafDescriptor *)
246: GC_malloc_atomic(sizeof(struct LeafDescriptor));
247:
248: if (result == NO_MEM || one_element == 0) return(NO_MEM);
249: one_element -> ld_tag = LEAF_TAG;
250: one_element -> ld_size = size;
251: one_element -> ld_nelements = 1;
252: one_element -> ld_descriptor = descriptor;
253: switch(result) {
254: case SIMPLE:
255: {
256: struct LeafDescriptor * beginning =
257: (struct LeafDescriptor *)
258: GC_malloc_atomic(sizeof(struct LeafDescriptor));
259: if (beginning == 0) return(NO_MEM);
260: beginning -> ld_tag = LEAF_TAG;
261: beginning -> ld_size = size;
262: beginning -> ld_nelements = 1;
263: beginning -> ld_descriptor = *simple_d;
264: *complex_d = GC_make_sequence_descriptor(
265: (complex_descriptor *)beginning,
266: (complex_descriptor *)one_element);
267: break;
268: }
269: case LEAF:
270: {
271: struct LeafDescriptor * beginning =
272: (struct LeafDescriptor *)
273: GC_malloc_atomic(sizeof(struct LeafDescriptor));
274: if (beginning == 0) return(NO_MEM);
275: beginning -> ld_tag = LEAF_TAG;
276: beginning -> ld_size = leaf -> ld_size;
277: beginning -> ld_nelements = leaf -> ld_nelements;
278: beginning -> ld_descriptor = leaf -> ld_descriptor;
279: *complex_d = GC_make_sequence_descriptor(
280: (complex_descriptor *)beginning,
281: (complex_descriptor *)one_element);
282: break;
283: }
284: case COMPLEX:
285: *complex_d = GC_make_sequence_descriptor(
286: *complex_d,
287: (complex_descriptor *)one_element);
288: break;
289: }
290: return(COMPLEX);
291: }
292: }
293: {
294: leaf -> ld_size = size;
295: leaf -> ld_nelements = nelements;
296: leaf -> ld_descriptor = descriptor;
297: return(LEAF);
298: }
299: }
300:
301: complex_descriptor * GC_make_sequence_descriptor(first, second)
302: complex_descriptor * first;
303: complex_descriptor * second;
304: {
305: struct SequenceDescriptor * result =
306: (struct SequenceDescriptor *)
307: GC_malloc(sizeof(struct SequenceDescriptor));
308: /* Can't result in overly conservative marking, since tags are */
309: /* very small integers. Probably faster than maintaining type */
310: /* info. */
311: if (result != 0) {
312: result -> sd_tag = SEQUENCE_TAG;
313: result -> sd_first = first;
314: result -> sd_second = second;
315: }
316: return((complex_descriptor *)result);
317: }
318:
319: #ifdef UNDEFINED
320: complex_descriptor * GC_make_complex_array_descriptor(nelements, descr)
321: word nelements;
322: complex_descriptor * descr;
323: {
324: struct ComplexArrayDescriptor * result =
325: (struct ComplexArrayDescriptor *)
326: GC_malloc(sizeof(struct ComplexArrayDescriptor));
327:
328: if (result != 0) {
329: result -> ad_tag = ARRAY_TAG;
330: result -> ad_nelements = nelements;
331: result -> ad_element_descr = descr;
332: }
333: return((complex_descriptor *)result);
334: }
335: #endif
336:
337: ptr_t * GC_eobjfreelist;
338:
339: ptr_t * GC_arobjfreelist;
340:
1.3 noro 341: mse * GC_typed_mark_proc GC_PROTO((register word * addr,
342: register mse * mark_stack_ptr,
343: mse * mark_stack_limit,
344: word env));
345:
346: mse * GC_array_mark_proc GC_PROTO((register word * addr,
347: register mse * mark_stack_ptr,
348: mse * mark_stack_limit,
349: word env));
1.1 noro 350:
351: GC_descr GC_generic_array_descr;
352:
353: /* Caller does not hold allocation lock. */
354: void GC_init_explicit_typing()
355: {
356: register int i;
357: DCL_LOCK_STATE;
358:
359:
360: # ifdef PRINTSTATS
361: if (sizeof(struct LeafDescriptor) % sizeof(word) != 0)
362: ABORT("Bad leaf descriptor size");
363: # endif
364: DISABLE_SIGNALS();
365: LOCK();
366: if (GC_explicit_typing_initialized) {
367: UNLOCK();
368: ENABLE_SIGNALS();
369: return;
370: }
371: GC_explicit_typing_initialized = TRUE;
372: /* Set up object kind with simple indirect descriptor. */
373: GC_eobjfreelist = (ptr_t *)
1.3 noro 374: GC_INTERNAL_MALLOC((MAXOBJSZ+1)*sizeof(ptr_t), PTRFREE);
1.1 noro 375: if (GC_eobjfreelist == 0) ABORT("Couldn't allocate GC_eobjfreelist");
376: BZERO(GC_eobjfreelist, (MAXOBJSZ+1)*sizeof(ptr_t));
377: GC_explicit_kind = GC_n_kinds++;
378: GC_obj_kinds[GC_explicit_kind].ok_freelist = GC_eobjfreelist;
379: GC_obj_kinds[GC_explicit_kind].ok_reclaim_list = 0;
380: GC_obj_kinds[GC_explicit_kind].ok_descriptor =
1.3 noro 381: (((word)WORDS_TO_BYTES(-1)) | GC_DS_PER_OBJECT);
1.1 noro 382: GC_obj_kinds[GC_explicit_kind].ok_relocate_descr = TRUE;
383: GC_obj_kinds[GC_explicit_kind].ok_init = TRUE;
384: /* Descriptors are in the last word of the object. */
385: GC_typed_mark_proc_index = GC_n_mark_procs;
386: GC_mark_procs[GC_typed_mark_proc_index] = GC_typed_mark_proc;
387: GC_n_mark_procs++;
388: /* Moving this up breaks DEC AXP compiler. */
389: /* Set up object kind with array descriptor. */
390: GC_arobjfreelist = (ptr_t *)
1.3 noro 391: GC_INTERNAL_MALLOC((MAXOBJSZ+1)*sizeof(ptr_t), PTRFREE);
1.1 noro 392: if (GC_arobjfreelist == 0) ABORT("Couldn't allocate GC_arobjfreelist");
393: BZERO(GC_arobjfreelist, (MAXOBJSZ+1)*sizeof(ptr_t));
394: if (GC_n_mark_procs >= MAX_MARK_PROCS)
395: ABORT("No slot for array mark proc");
396: GC_array_mark_proc_index = GC_n_mark_procs++;
397: if (GC_n_kinds >= MAXOBJKINDS)
398: ABORT("No kind available for array objects");
399: GC_array_kind = GC_n_kinds++;
400: GC_obj_kinds[GC_array_kind].ok_freelist = GC_arobjfreelist;
401: GC_obj_kinds[GC_array_kind].ok_reclaim_list = 0;
402: GC_obj_kinds[GC_array_kind].ok_descriptor =
1.3 noro 403: GC_MAKE_PROC(GC_array_mark_proc_index, 0);;
1.1 noro 404: GC_obj_kinds[GC_array_kind].ok_relocate_descr = FALSE;
405: GC_obj_kinds[GC_array_kind].ok_init = TRUE;
406: /* Descriptors are in the last word of the object. */
407: GC_mark_procs[GC_array_mark_proc_index] = GC_array_mark_proc;
408: for (i = 0; i < WORDSZ/2; i++) {
409: GC_descr d = (((word)(-1)) >> (WORDSZ - i)) << (WORDSZ - i);
1.3 noro 410: d |= GC_DS_BITMAP;
1.1 noro 411: GC_bm_table[i] = d;
412: }
1.3 noro 413: GC_generic_array_descr = GC_MAKE_PROC(GC_array_mark_proc_index, 0);
1.1 noro 414: UNLOCK();
415: ENABLE_SIGNALS();
416: }
417:
1.3 noro 418: # if defined(__STDC__) || defined(__cplusplus)
419: mse * GC_typed_mark_proc(register word * addr,
420: register mse * mark_stack_ptr,
421: mse * mark_stack_limit,
422: word env)
423: # else
424: mse * GC_typed_mark_proc(addr, mark_stack_ptr, mark_stack_limit, env)
425: register word * addr;
426: register mse * mark_stack_ptr;
427: mse * mark_stack_limit;
428: word env;
429: # endif
1.1 noro 430: {
431: register word bm = GC_ext_descriptors[env].ed_bitmap;
432: register word * current_p = addr;
433: register word current;
434: register ptr_t greatest_ha = GC_greatest_plausible_heap_addr;
435: register ptr_t least_ha = GC_least_plausible_heap_addr;
436:
437: for (; bm != 0; bm >>= 1, current_p++) {
438: if (bm & 1) {
439: current = *current_p;
440: if ((ptr_t)current >= least_ha && (ptr_t)current <= greatest_ha) {
1.2 noro 441: PUSH_CONTENTS((ptr_t)current, mark_stack_ptr,
1.1 noro 442: mark_stack_limit, current_p, exit1);
443: }
444: }
445: }
446: if (GC_ext_descriptors[env].ed_continued) {
447: /* Push an entry with the rest of the descriptor back onto the */
448: /* stack. Thus we never do too much work at once. Note that */
449: /* we also can't overflow the mark stack unless we actually */
450: /* mark something. */
451: mark_stack_ptr++;
452: if (mark_stack_ptr >= mark_stack_limit) {
453: mark_stack_ptr = GC_signal_mark_stack_overflow(mark_stack_ptr);
454: }
455: mark_stack_ptr -> mse_start = addr + WORDSZ;
456: mark_stack_ptr -> mse_descr =
1.3 noro 457: GC_MAKE_PROC(GC_typed_mark_proc_index, env+1);
1.1 noro 458: }
459: return(mark_stack_ptr);
460: }
461:
462: /* Return the size of the object described by d. It would be faster to */
463: /* store this directly, or to compute it as part of */
464: /* GC_push_complex_descriptor, but hopefully it doesn't matter. */
465: word GC_descr_obj_size(d)
466: register complex_descriptor *d;
467: {
468: switch(d -> TAG) {
469: case LEAF_TAG:
470: return(d -> ld.ld_nelements * d -> ld.ld_size);
471: case ARRAY_TAG:
472: return(d -> ad.ad_nelements
473: * GC_descr_obj_size(d -> ad.ad_element_descr));
474: case SEQUENCE_TAG:
475: return(GC_descr_obj_size(d -> sd.sd_first)
476: + GC_descr_obj_size(d -> sd.sd_second));
477: default:
478: ABORT("Bad complex descriptor");
479: /*NOTREACHED*/ return 0; /*NOTREACHED*/
480: }
481: }
482:
483: /* Push descriptors for the object at addr with complex descriptor d */
484: /* onto the mark stack. Return 0 if the mark stack overflowed. */
485: mse * GC_push_complex_descriptor(addr, d, msp, msl)
486: word * addr;
487: register complex_descriptor *d;
488: register mse * msp;
489: mse * msl;
490: {
491: register ptr_t current = (ptr_t) addr;
492: register word nelements;
493: register word sz;
494: register word i;
495:
496: switch(d -> TAG) {
497: case LEAF_TAG:
498: {
499: register GC_descr descr = d -> ld.ld_descriptor;
500:
501: nelements = d -> ld.ld_nelements;
502: if (msl - msp <= (ptrdiff_t)nelements) return(0);
503: sz = d -> ld.ld_size;
504: for (i = 0; i < nelements; i++) {
505: msp++;
506: msp -> mse_start = (word *)current;
507: msp -> mse_descr = descr;
508: current += sz;
509: }
510: return(msp);
511: }
512: case ARRAY_TAG:
513: {
514: register complex_descriptor *descr = d -> ad.ad_element_descr;
515:
516: nelements = d -> ad.ad_nelements;
517: sz = GC_descr_obj_size(descr);
518: for (i = 0; i < nelements; i++) {
519: msp = GC_push_complex_descriptor((word *)current, descr,
520: msp, msl);
521: if (msp == 0) return(0);
522: current += sz;
523: }
524: return(msp);
525: }
526: case SEQUENCE_TAG:
527: {
528: sz = GC_descr_obj_size(d -> sd.sd_first);
529: msp = GC_push_complex_descriptor((word *)current, d -> sd.sd_first,
530: msp, msl);
531: if (msp == 0) return(0);
532: current += sz;
533: msp = GC_push_complex_descriptor((word *)current, d -> sd.sd_second,
534: msp, msl);
535: return(msp);
536: }
537: default:
538: ABORT("Bad complex descriptor");
539: /*NOTREACHED*/ return 0; /*NOTREACHED*/
540: }
541: }
542:
543: /*ARGSUSED*/
1.3 noro 544: # if defined(__STDC__) || defined(__cplusplus)
545: mse * GC_array_mark_proc(register word * addr,
546: register mse * mark_stack_ptr,
547: mse * mark_stack_limit,
548: word env)
549: # else
550: mse * GC_array_mark_proc(addr, mark_stack_ptr, mark_stack_limit, env)
551: register word * addr;
552: register mse * mark_stack_ptr;
553: mse * mark_stack_limit;
554: word env;
555: # endif
1.1 noro 556: {
557: register hdr * hhdr = HDR(addr);
558: register word sz = hhdr -> hb_sz;
559: register complex_descriptor * descr = (complex_descriptor *)(addr[sz-1]);
560: mse * orig_mark_stack_ptr = mark_stack_ptr;
561: mse * new_mark_stack_ptr;
562:
563: if (descr == 0) {
564: /* Found a reference to a free list entry. Ignore it. */
565: return(orig_mark_stack_ptr);
566: }
567: /* In use counts were already updated when array descriptor was */
568: /* pushed. Here we only replace it by subobject descriptors, so */
569: /* no update is necessary. */
570: new_mark_stack_ptr = GC_push_complex_descriptor(addr, descr,
571: mark_stack_ptr,
572: mark_stack_limit-1);
573: if (new_mark_stack_ptr == 0) {
574: /* Doesn't fit. Conservatively push the whole array as a unit */
575: /* and request a mark stack expansion. */
576: /* This cannot cause a mark stack overflow, since it replaces */
577: /* the original array entry. */
578: GC_mark_stack_too_small = TRUE;
579: new_mark_stack_ptr = orig_mark_stack_ptr + 1;
580: new_mark_stack_ptr -> mse_start = addr;
1.3 noro 581: new_mark_stack_ptr -> mse_descr = WORDS_TO_BYTES(sz) | GC_DS_LENGTH;
1.1 noro 582: } else {
583: /* Push descriptor itself */
584: new_mark_stack_ptr++;
585: new_mark_stack_ptr -> mse_start = addr + sz - 1;
1.3 noro 586: new_mark_stack_ptr -> mse_descr = sizeof(word) | GC_DS_LENGTH;
1.1 noro 587: }
588: return(new_mark_stack_ptr);
589: }
590:
591: #if defined(__STDC__) || defined(__cplusplus)
592: GC_descr GC_make_descriptor(GC_bitmap bm, size_t len)
593: #else
594: GC_descr GC_make_descriptor(bm, len)
595: GC_bitmap bm;
596: size_t len;
597: #endif
598: {
599: register signed_word last_set_bit = len - 1;
600: register word result;
601: register int i;
602: # define HIGH_BIT (((word)1) << (WORDSZ - 1))
603:
604: if (!GC_explicit_typing_initialized) GC_init_explicit_typing();
605: while (last_set_bit >= 0 && !GC_get_bit(bm, last_set_bit)) last_set_bit --;
606: if (last_set_bit < 0) return(0 /* no pointers */);
607: # if ALIGNMENT == CPP_WORDSZ/8
608: {
609: register GC_bool all_bits_set = TRUE;
610: for (i = 0; i < last_set_bit; i++) {
611: if (!GC_get_bit(bm, i)) {
612: all_bits_set = FALSE;
613: break;
614: }
615: }
616: if (all_bits_set) {
617: /* An initial section contains all pointers. Use length descriptor. */
1.3 noro 618: return(WORDS_TO_BYTES(last_set_bit+1) | GC_DS_LENGTH);
1.1 noro 619: }
620: }
621: # endif
622: if (last_set_bit < BITMAP_BITS) {
623: /* Hopefully the common case. */
624: /* Build bitmap descriptor (with bits reversed) */
625: result = HIGH_BIT;
626: for (i = last_set_bit - 1; i >= 0; i--) {
627: result >>= 1;
628: if (GC_get_bit(bm, i)) result |= HIGH_BIT;
629: }
1.3 noro 630: result |= GC_DS_BITMAP;
1.1 noro 631: return(result);
632: } else {
633: signed_word index;
634:
635: index = GC_add_ext_descriptor(bm, (word)last_set_bit+1);
1.3 noro 636: if (index == -1) return(WORDS_TO_BYTES(last_set_bit+1) | GC_DS_LENGTH);
1.1 noro 637: /* Out of memory: use conservative */
638: /* approximation. */
1.3 noro 639: result = GC_MAKE_PROC(GC_typed_mark_proc_index, (word)index);
1.1 noro 640: return(result);
641: }
642: }
643:
644: ptr_t GC_clear_stack();
645:
646: #define GENERAL_MALLOC(lb,k) \
647: (GC_PTR)GC_clear_stack(GC_generic_malloc((word)lb, k))
648:
649: #define GENERAL_MALLOC_IOP(lb,k) \
650: (GC_PTR)GC_clear_stack(GC_generic_malloc_ignore_off_page(lb, k))
651:
652: #if defined(__STDC__) || defined(__cplusplus)
653: void * GC_malloc_explicitly_typed(size_t lb, GC_descr d)
654: #else
655: char * GC_malloc_explicitly_typed(lb, d)
656: size_t lb;
657: GC_descr d;
658: #endif
659: {
660: register ptr_t op;
661: register ptr_t * opp;
662: register word lw;
663: DCL_LOCK_STATE;
664:
1.3 noro 665: lb += TYPD_EXTRA_BYTES;
1.1 noro 666: if( SMALL_OBJ(lb) ) {
667: # ifdef MERGE_SIZES
668: lw = GC_size_map[lb];
669: # else
670: lw = ALIGNED_WORDS(lb);
671: # endif
672: opp = &(GC_eobjfreelist[lw]);
673: FASTLOCK();
674: if( !FASTLOCK_SUCCEEDED() || (op = *opp) == 0 ) {
675: FASTUNLOCK();
676: op = (ptr_t)GENERAL_MALLOC((word)lb, GC_explicit_kind);
677: if (0 == op) return(0);
678: # ifdef MERGE_SIZES
679: lw = GC_size_map[lb]; /* May have been uninitialized. */
680: # endif
681: } else {
682: *opp = obj_link(op);
1.2 noro 683: obj_link(op) = 0;
1.1 noro 684: GC_words_allocd += lw;
685: FASTUNLOCK();
686: }
687: } else {
688: op = (ptr_t)GENERAL_MALLOC((word)lb, GC_explicit_kind);
689: if (op != NULL)
690: lw = BYTES_TO_WORDS(GC_size(op));
691: }
692: if (op != NULL)
693: ((word *)op)[lw - 1] = d;
694: return((GC_PTR) op);
695: }
696:
697: #if defined(__STDC__) || defined(__cplusplus)
698: void * GC_malloc_explicitly_typed_ignore_off_page(size_t lb, GC_descr d)
699: #else
700: char * GC_malloc_explicitly_typed_ignore_off_page(lb, d)
701: size_t lb;
702: GC_descr d;
703: #endif
704: {
705: register ptr_t op;
706: register ptr_t * opp;
707: register word lw;
708: DCL_LOCK_STATE;
709:
1.3 noro 710: lb += TYPD_EXTRA_BYTES;
1.1 noro 711: if( SMALL_OBJ(lb) ) {
712: # ifdef MERGE_SIZES
713: lw = GC_size_map[lb];
714: # else
715: lw = ALIGNED_WORDS(lb);
716: # endif
717: opp = &(GC_eobjfreelist[lw]);
718: FASTLOCK();
719: if( !FASTLOCK_SUCCEEDED() || (op = *opp) == 0 ) {
720: FASTUNLOCK();
721: op = (ptr_t)GENERAL_MALLOC_IOP(lb, GC_explicit_kind);
722: # ifdef MERGE_SIZES
723: lw = GC_size_map[lb]; /* May have been uninitialized. */
724: # endif
725: } else {
726: *opp = obj_link(op);
1.2 noro 727: obj_link(op) = 0;
1.1 noro 728: GC_words_allocd += lw;
729: FASTUNLOCK();
730: }
731: } else {
732: op = (ptr_t)GENERAL_MALLOC_IOP(lb, GC_explicit_kind);
733: if (op != NULL)
734: lw = BYTES_TO_WORDS(GC_size(op));
735: }
736: if (op != NULL)
1.2 noro 737: ((word *)op)[lw - 1] = d;
1.1 noro 738: return((GC_PTR) op);
739: }
740:
741: #if defined(__STDC__) || defined(__cplusplus)
742: void * GC_calloc_explicitly_typed(size_t n,
743: size_t lb,
744: GC_descr d)
745: #else
746: char * GC_calloc_explicitly_typed(n, lb, d)
747: size_t n;
748: size_t lb;
749: GC_descr d;
750: #endif
751: {
752: register ptr_t op;
753: register ptr_t * opp;
754: register word lw;
755: GC_descr simple_descr;
756: complex_descriptor *complex_descr;
757: register int descr_type;
758: struct LeafDescriptor leaf;
759: DCL_LOCK_STATE;
760:
761: descr_type = GC_make_array_descriptor((word)n, (word)lb, d,
762: &simple_descr, &complex_descr, &leaf);
763: switch(descr_type) {
764: case NO_MEM: return(0);
765: case SIMPLE: return(GC_malloc_explicitly_typed(n*lb, simple_descr));
766: case LEAF:
767: lb *= n;
1.3 noro 768: lb += sizeof(struct LeafDescriptor) + TYPD_EXTRA_BYTES;
1.1 noro 769: break;
770: case COMPLEX:
771: lb *= n;
1.3 noro 772: lb += TYPD_EXTRA_BYTES;
1.1 noro 773: break;
774: }
775: if( SMALL_OBJ(lb) ) {
776: # ifdef MERGE_SIZES
777: lw = GC_size_map[lb];
778: # else
779: lw = ALIGNED_WORDS(lb);
780: # endif
781: opp = &(GC_arobjfreelist[lw]);
782: FASTLOCK();
783: if( !FASTLOCK_SUCCEEDED() || (op = *opp) == 0 ) {
784: FASTUNLOCK();
785: op = (ptr_t)GENERAL_MALLOC((word)lb, GC_array_kind);
786: if (0 == op) return(0);
787: # ifdef MERGE_SIZES
788: lw = GC_size_map[lb]; /* May have been uninitialized. */
789: # endif
790: } else {
791: *opp = obj_link(op);
1.2 noro 792: obj_link(op) = 0;
1.1 noro 793: GC_words_allocd += lw;
794: FASTUNLOCK();
795: }
796: } else {
797: op = (ptr_t)GENERAL_MALLOC((word)lb, GC_array_kind);
798: if (0 == op) return(0);
799: lw = BYTES_TO_WORDS(GC_size(op));
800: }
801: if (descr_type == LEAF) {
802: /* Set up the descriptor inside the object itself. */
803: VOLATILE struct LeafDescriptor * lp =
804: (struct LeafDescriptor *)
805: ((word *)op
806: + lw - (BYTES_TO_WORDS(sizeof(struct LeafDescriptor)) + 1));
807:
808: lp -> ld_tag = LEAF_TAG;
809: lp -> ld_size = leaf.ld_size;
810: lp -> ld_nelements = leaf.ld_nelements;
811: lp -> ld_descriptor = leaf.ld_descriptor;
812: ((VOLATILE word *)op)[lw - 1] = (word)lp;
813: } else {
814: extern unsigned GC_finalization_failures;
815: unsigned ff = GC_finalization_failures;
816:
817: ((word *)op)[lw - 1] = (word)complex_descr;
818: /* Make sure the descriptor is cleared once there is any danger */
819: /* it may have been collected. */
820: (void)
821: GC_general_register_disappearing_link((GC_PTR *)
822: ((word *)op+lw-1),
823: (GC_PTR) op);
824: if (ff != GC_finalization_failures) {
825: /* Couldn't register it due to lack of memory. Punt. */
826: /* This will probably fail too, but gives the recovery code */
827: /* a chance. */
828: return(GC_malloc(n*lb));
829: }
830: }
831: return((GC_PTR) op);
832: }
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