source: trunk/gcc/boehm-gc/gcj_mlc.c@ 3579

Last change on this file since 3579 was 2, checked in by bird, 23 years ago

Initial revision
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File size: 9.4 KB
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1/*
2 * Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
3 * Copyright (c) 1999 by Hewlett-Packard Company. All rights reserved.
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/* Boehm, July 31, 1995 5:02 pm PDT */
16
17#ifdef GC_GCJ_SUPPORT
18
19/*
20 * This is an allocator interface tuned for gcj (the GNU static
21 * java compiler).
22 *
23 * Each allocated object has a pointer in its first word to a vtable,
24 * which for our purposes is simply a structure describing the type of
25 * the object.
26 * This descriptor structure contains a GC marking descriptor at offset
27 * MARK_DESCR_OFFSET.
28 *
29 * It is hoped that this interface may also be useful for other systems,
30 * possibly with some tuning of the constants. But the immediate goal
31 * is to get better gcj performance.
32 *
33 * We assume:
34 * 1) We have an ANSI conforming C compiler.
35 * 2) Counting on explicit initialization of this interface is OK.
36 * 3) FASTLOCK is not a significant win.
37 */
38
39#include "private/gc_pmark.h"
40#include "gc_gcj.h"
41#include "private/dbg_mlc.h"
42
43GC_bool GC_gcj_malloc_initialized = FALSE;
44
45int GC_gcj_kind; /* Object kind for objects with descriptors */
46 /* in "vtable". */
47int GC_gcj_debug_kind; /* The kind of objects that is always marked */
48 /* with a mark proc call. */
49
50ptr_t * GC_gcjobjfreelist;
51ptr_t * GC_gcjdebugobjfreelist;
52
53/* Caller does not hold allocation lock. */
54void GC_init_gcj_malloc(int mp_index, void * /* really GC_mark_proc */mp)
55{
56 register int i;
57 GC_bool ignore_gcj_info;
58 DCL_LOCK_STATE;
59
60 GC_init(); /* In case it's not already done. */
61 DISABLE_SIGNALS();
62 LOCK();
63 if (GC_gcj_malloc_initialized) {
64 UNLOCK();
65 ENABLE_SIGNALS();
66 return;
67 }
68 GC_gcj_malloc_initialized = TRUE;
69 ignore_gcj_info = (0 != GETENV("GC_IGNORE_GCJ_INFO"));
70# ifdef CONDPRINT
71 if (GC_print_stats && ignore_gcj_info) {
72 GC_printf0("Gcj-style type information is disabled!\n");
73 }
74# endif
75 GC_mark_procs[mp_index] = (GC_mark_proc)mp;
76 if (mp_index >= GC_n_mark_procs) ABORT("GC_init_gcj_malloc: bad index");
77 /* Set up object kind gcj-style indirect descriptor. */
78 GC_gcjobjfreelist = (ptr_t *)
79 GC_INTERNAL_MALLOC((MAXOBJSZ+1)*sizeof(ptr_t), PTRFREE);
80 if (GC_gcjobjfreelist == 0) ABORT("Couldn't allocate GC_gcjobjfreelist");
81 BZERO(GC_gcjobjfreelist, (MAXOBJSZ+1)*sizeof(ptr_t));
82 GC_gcj_kind = GC_n_kinds++;
83 GC_obj_kinds[GC_gcj_kind].ok_freelist = GC_gcjobjfreelist;
84 GC_obj_kinds[GC_gcj_kind].ok_reclaim_list = 0;
85 if (ignore_gcj_info) {
86 /* Use a simple length-based descriptor, thus forcing a fully */
87 /* conservative scan. */
88 GC_obj_kinds[GC_gcj_kind].ok_descriptor = (0 | GC_DS_LENGTH);
89 GC_obj_kinds[GC_gcj_kind].ok_relocate_descr = TRUE;
90 } else {
91 GC_obj_kinds[GC_gcj_kind].ok_descriptor =
92 (((word)(-MARK_DESCR_OFFSET - GC_INDIR_PER_OBJ_BIAS))
93 | GC_DS_PER_OBJECT);
94 GC_obj_kinds[GC_gcj_kind].ok_relocate_descr = FALSE;
95 }
96 GC_obj_kinds[GC_gcj_kind].ok_init = TRUE;
97 /* Set up object kind for objects that require mark proc call. */
98 GC_gcjdebugobjfreelist = (ptr_t *)
99 GC_INTERNAL_MALLOC((MAXOBJSZ+1)*sizeof(ptr_t), PTRFREE);
100 if (GC_gcjdebugobjfreelist == 0)
101 ABORT("Couldn't allocate GC_gcjdebugobjfreelist");
102 BZERO(GC_gcjdebugobjfreelist, (MAXOBJSZ+1)*sizeof(ptr_t));
103 GC_gcj_debug_kind = GC_n_kinds++;
104 GC_obj_kinds[GC_gcj_debug_kind].ok_freelist = GC_gcjdebugobjfreelist;
105 GC_obj_kinds[GC_gcj_debug_kind].ok_reclaim_list = 0;
106 if (ignore_gcj_info) {
107 GC_obj_kinds[GC_gcj_kind].ok_descriptor = (0 | GC_DS_LENGTH);
108 GC_obj_kinds[GC_gcj_kind].ok_relocate_descr = TRUE;
109 } else {
110 GC_obj_kinds[GC_gcj_debug_kind].ok_descriptor =
111 GC_MAKE_PROC(mp_index, 1 /* allocated with debug info */);
112 GC_obj_kinds[GC_gcj_debug_kind].ok_relocate_descr = FALSE;
113 }
114 GC_obj_kinds[GC_gcj_debug_kind].ok_init = TRUE;
115 UNLOCK();
116 ENABLE_SIGNALS();
117}
118
119ptr_t GC_clear_stack();
120
121#define GENERAL_MALLOC(lb,k) \
122 (GC_PTR)GC_clear_stack(GC_generic_malloc_inner((word)lb, k))
123
124#define GENERAL_MALLOC_IOP(lb,k) \
125 (GC_PTR)GC_clear_stack(GC_generic_malloc_inner_ignore_off_page(lb, k))
126
127/* Allocate an object, clear it, and store the pointer to the */
128/* type structure (vtable in gcj). */
129/* This adds a byte at the end of the object if GC_malloc would.*/
130void * GC_gcj_malloc(size_t lb, void * ptr_to_struct_containing_descr)
131{
132register ptr_t op;
133register ptr_t * opp;
134register word lw;
135DCL_LOCK_STATE;
136
137 if( EXPECT(SMALL_OBJ(lb), 1) ) {
138# ifdef MERGE_SIZES
139 lw = GC_size_map[lb];
140# else
141 lw = ALIGNED_WORDS(lb);
142# endif
143 opp = &(GC_gcjobjfreelist[lw]);
144 LOCK();
145 op = *opp;
146 if( EXPECT(op == 0, 0)) {
147 op = (ptr_t)GENERAL_MALLOC((word)lb, GC_gcj_kind);
148 if (0 == op) {
149 UNLOCK();
150 return(GC_oom_fn(lb));
151 }
152# ifdef MERGE_SIZES
153 lw = GC_size_map[lb]; /* May have been uninitialized. */
154# endif
155 } else {
156 *opp = obj_link(op);
157 GC_words_allocd += lw;
158 }
159 *(void **)op = ptr_to_struct_containing_descr;
160 UNLOCK();
161 } else {
162 LOCK();
163 op = (ptr_t)GENERAL_MALLOC((word)lb, GC_gcj_kind);
164 if (0 == op) {
165 UNLOCK();
166 return(GC_oom_fn(lb));
167 }
168 *(void **)op = ptr_to_struct_containing_descr;
169 UNLOCK();
170 }
171 return((GC_PTR) op);
172}
173
174/* Similar to GC_gcj_malloc, but add debug info. This is allocated */
175/* with GC_gcj_debug_kind. */
176GC_PTR GC_debug_gcj_malloc(size_t lb, void * ptr_to_struct_containing_descr,
177 GC_EXTRA_PARAMS)
178{
179 GC_PTR result;
180
181 /* We clone the code from GC_debug_gcj_malloc, so that we */
182 /* dont end up with extra frames on the stack, which could */
183 /* confuse the backtrace. */
184 LOCK();
185 result = GC_generic_malloc_inner(lb + DEBUG_BYTES, GC_gcj_debug_kind);
186 if (result == 0) {
187 UNLOCK();
188 GC_err_printf2("GC_debug_gcj_malloc(%ld, 0x%lx) returning NIL (",
189 (unsigned long) lb,
190 (unsigned long) ptr_to_struct_containing_descr);
191 GC_err_puts(s);
192 GC_err_printf1(":%ld)\n", (unsigned long)i);
193 return(GC_oom_fn(lb));
194 }
195 *((void **)((ptr_t)result + sizeof(oh))) = ptr_to_struct_containing_descr;
196 UNLOCK();
197 if (!GC_debugging_started) {
198 GC_start_debugging();
199 }
200 ADD_CALL_CHAIN(result, ra);
201 return (GC_store_debug_info(result, (word)lb, s, (word)i));
202}
203
204/* Similar to GC_gcj_malloc, but the size is in words, and we don't */
205/* adjust it. The size is assumed to be such that it can be */
206/* allocated as a small object. */
207void * GC_gcj_fast_malloc(size_t lw, void * ptr_to_struct_containing_descr)
208{
209ptr_t op;
210ptr_t * opp;
211DCL_LOCK_STATE;
212
213 opp = &(GC_gcjobjfreelist[lw]);
214 LOCK();
215 op = *opp;
216 if( EXPECT(op == 0, 0) ) {
217 op = (ptr_t)GC_clear_stack(
218 GC_generic_malloc_words_small_inner(lw, GC_gcj_kind));
219 if (0 == op) {
220 UNLOCK();
221 return GC_oom_fn(WORDS_TO_BYTES(lw));
222 }
223 } else {
224 *opp = obj_link(op);
225 GC_words_allocd += lw;
226 }
227 *(void **)op = ptr_to_struct_containing_descr;
228 UNLOCK();
229 return((GC_PTR) op);
230}
231
232/* And a debugging version of the above: */
233void * GC_debug_gcj_fast_malloc(size_t lw,
234 void * ptr_to_struct_containing_descr,
235 GC_EXTRA_PARAMS)
236{
237 GC_PTR result;
238 size_t lb = WORDS_TO_BYTES(lw);
239
240 /* We clone the code from GC_debug_gcj_malloc, so that we */
241 /* dont end up with extra frames on the stack, which could */
242 /* confuse the backtrace. */
243 LOCK();
244 result = GC_generic_malloc_inner(lb + DEBUG_BYTES, GC_gcj_debug_kind);
245 if (result == 0) {
246 UNLOCK();
247 GC_err_printf2("GC_debug_gcj_fast_malloc(%ld, 0x%lx) returning NIL (",
248 (unsigned long) lw,
249 (unsigned long) ptr_to_struct_containing_descr);
250 GC_err_puts(s);
251 GC_err_printf1(":%ld)\n", (unsigned long)i);
252 return GC_oom_fn(WORDS_TO_BYTES(lw));
253 }
254 *((void **)((ptr_t)result + sizeof(oh))) = ptr_to_struct_containing_descr;
255 UNLOCK();
256 if (!GC_debugging_started) {
257 GC_start_debugging();
258 }
259 ADD_CALL_CHAIN(result, ra);
260 return (GC_store_debug_info(result, (word)lb, s, (word)i));
261}
262
263void * GC_gcj_malloc_ignore_off_page(size_t lb,
264 void * ptr_to_struct_containing_descr)
265{
266register ptr_t op;
267register ptr_t * opp;
268register word lw;
269DCL_LOCK_STATE;
270
271 if( SMALL_OBJ(lb) ) {
272# ifdef MERGE_SIZES
273 lw = GC_size_map[lb];
274# else
275 lw = ALIGNED_WORDS(lb);
276# endif
277 opp = &(GC_gcjobjfreelist[lw]);
278 LOCK();
279 if( (op = *opp) == 0 ) {
280 op = (ptr_t)GENERAL_MALLOC_IOP(lb, GC_gcj_kind);
281# ifdef MERGE_SIZES
282 lw = GC_size_map[lb]; /* May have been uninitialized. */
283# endif
284 } else {
285 *opp = obj_link(op);
286 GC_words_allocd += lw;
287 }
288 *(void **)op = ptr_to_struct_containing_descr;
289 UNLOCK();
290 } else {
291 op = (ptr_t)GENERAL_MALLOC_IOP(lb, GC_gcj_kind);
292 if (0 != op) {
293 *(void **)op = ptr_to_struct_containing_descr;
294 }
295 UNLOCK();
296 }
297 return((GC_PTR) op);
298}
299
300#else
301
302char GC_no_gcj_support;
303
304#endif /* GC_GCJ_SUPPORT */
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