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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [boehm-gc/] [gcj_mlc.c] - Blame information for rev 791

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1 721 jeremybenn
/*
2
 * Copyright (c) 1991-1994 by Xerox Corporation.  All rights reserved.
3
 * Copyright (c) 1999 by Hewlett-Packard Company.  All rights reserved.
4
 *
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 * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
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 * OR IMPLIED.  ANY USE IS AT YOUR OWN RISK.
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 *
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 * Permission is hereby granted to use or copy this program
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 * for any purpose,  provided the above notices are retained on all copies.
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 * Permission to modify the code and to distribute modified code is granted,
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 * provided the above notices are retained, and a notice that the code was
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 * modified is included with the above copyright notice.
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 *
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 */
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/* Boehm, July 31, 1995 5:02 pm PDT */
16
 
17
/*
18
 * This is an allocator interface tuned for gcj (the GNU static
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 * java compiler).
20
 *
21
 * Each allocated object has a pointer in its first word to a vtable,
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 * which for our purposes is simply a structure describing the type of
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 * the object.
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 * This descriptor structure contains a GC marking descriptor at offset
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 * MARK_DESCR_OFFSET.
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 *
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 * It is hoped that this interface may also be useful for other systems,
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 * possibly with some tuning of the constants.  But the immediate goal
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 * is to get better gcj performance.
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 *
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 * We assume:
32
 *  1) We have an ANSI conforming C compiler.
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 *  2) Counting on explicit initialization of this interface is OK.
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 *  3) FASTLOCK is not a significant win.
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 */
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#include "private/gc_pmark.h"
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#include "gc_gcj.h"
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#include "private/dbg_mlc.h"
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41
#ifdef GC_GCJ_SUPPORT
42
 
43
GC_bool GC_gcj_malloc_initialized = FALSE;
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45
int GC_gcj_kind;        /* Object kind for objects with descriptors     */
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                        /* in "vtable".                                 */
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int GC_gcj_debug_kind;  /* The kind of objects that is always marked    */
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                        /* with a mark proc call.                       */
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50
ptr_t * GC_gcjobjfreelist;
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ptr_t * GC_gcjdebugobjfreelist;
52
 
53
/* Caller does not hold allocation lock. */
54
void GC_init_gcj_malloc(int mp_index, void * /* really GC_mark_proc */mp)
55
{
56
    register int i;
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    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();
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      ENABLE_SIGNALS();
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      return;
67
    }
68
    GC_gcj_malloc_initialized = TRUE;
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    ignore_gcj_info = (0 != GETENV("GC_IGNORE_GCJ_INFO"));
70
#   ifdef CONDPRINT
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      if (GC_print_stats && ignore_gcj_info) {
72
        GC_printf0("Gcj-style type information is disabled!\n");
73
      }
74
#   endif
75
    GC_ASSERT(GC_mark_procs[mp_index] == (GC_mark_proc)0); /* unused */
76
    GC_mark_procs[mp_index] = (GC_mark_proc)mp;
77
    if (mp_index >= GC_n_mark_procs) ABORT("GC_init_gcj_malloc: bad index");
78
    /* Set up object kind gcj-style indirect descriptor. */
79
      GC_gcjobjfreelist = (ptr_t *)GC_new_free_list_inner();
80
      if (ignore_gcj_info) {
81
        /* Use a simple length-based descriptor, thus forcing a fully   */
82
        /* conservative scan.                                           */
83
        GC_gcj_kind = GC_new_kind_inner((void **)GC_gcjobjfreelist,
84
                                        (0 | GC_DS_LENGTH),
85
                                        TRUE, TRUE);
86
      } else {
87
        GC_gcj_kind = GC_new_kind_inner(
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                        (void **)GC_gcjobjfreelist,
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                        (((word)(-MARK_DESCR_OFFSET - GC_INDIR_PER_OBJ_BIAS))
90
                         | GC_DS_PER_OBJECT),
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                        FALSE, TRUE);
92
      }
93
    /* Set up object kind for objects that require mark proc call.      */
94
      if (ignore_gcj_info) {
95
        GC_gcj_debug_kind = GC_gcj_kind;
96
        GC_gcjdebugobjfreelist = GC_gcjobjfreelist;
97
      } else {
98
        GC_gcjdebugobjfreelist = (ptr_t *)GC_new_free_list_inner();
99
        GC_gcj_debug_kind = GC_new_kind_inner(
100
                                (void **)GC_gcjdebugobjfreelist,
101
                                GC_MAKE_PROC(mp_index,
102
                                             1 /* allocated with debug info */),
103
                                FALSE, TRUE);
104
      }
105
    UNLOCK();
106
    ENABLE_SIGNALS();
107
}
108
 
109
ptr_t GC_clear_stack();
110
 
111
#define GENERAL_MALLOC(lb,k) \
112
    (GC_PTR)GC_clear_stack(GC_generic_malloc_inner((word)lb, k))
113
 
114
#define GENERAL_MALLOC_IOP(lb,k) \
115
    (GC_PTR)GC_clear_stack(GC_generic_malloc_inner_ignore_off_page(lb, k))
116
 
117
/* We need a mechanism to release the lock and invoke finalizers.       */
118
/* We don't really have an opportunity to do this on a rarely executed  */
119
/* path on which the lock is not held.  Thus we check at a              */
120
/* rarely executed point at which it is safe to release the lock.       */
121
/* We do this even where we could just call GC_INVOKE_FINALIZERS,       */
122
/* since it's probably cheaper and certainly more uniform.              */
123
/* FIXME - Consider doing the same elsewhere?                           */
124
static void maybe_finalize()
125
{
126
   static int last_finalized_no = 0;
127
 
128
   if (GC_gc_no == last_finalized_no) return;
129
   if (!GC_is_initialized) return;
130
   UNLOCK();
131
   GC_INVOKE_FINALIZERS();
132
   last_finalized_no = GC_gc_no;
133
   LOCK();
134
}
135
 
136
/* Allocate an object, clear it, and store the pointer to the   */
137
/* type structure (vtable in gcj).                              */
138
/* This adds a byte at the end of the object if GC_malloc would.*/
139
void * GC_gcj_malloc(size_t lb, void * ptr_to_struct_containing_descr)
140
{
141
register ptr_t op;
142
register ptr_t * opp;
143
register word lw;
144
DCL_LOCK_STATE;
145
 
146
    if( EXPECT(SMALL_OBJ(lb), 1) ) {
147
#       ifdef MERGE_SIZES
148
          lw = GC_size_map[lb];
149
#       else
150
          lw = ALIGNED_WORDS(lb);
151
#       endif
152
        opp = &(GC_gcjobjfreelist[lw]);
153
        LOCK();
154
        op = *opp;
155
        if(EXPECT(op == 0, 0)) {
156
            maybe_finalize();
157
            op = (ptr_t)GENERAL_MALLOC((word)lb, GC_gcj_kind);
158
            if (0 == op) {
159
                UNLOCK();
160
                return(GC_oom_fn(lb));
161
            }
162
#           ifdef MERGE_SIZES
163
                lw = GC_size_map[lb];   /* May have been uninitialized. */
164
#           endif
165
        } else {
166
            *opp = obj_link(op);
167
            GC_words_allocd += lw;
168
        }
169
        *(void **)op = ptr_to_struct_containing_descr;
170
        GC_ASSERT(((void **)op)[1] == 0);
171
        UNLOCK();
172
    } else {
173
        LOCK();
174
        maybe_finalize();
175
        op = (ptr_t)GENERAL_MALLOC((word)lb, GC_gcj_kind);
176
        if (0 == op) {
177
            UNLOCK();
178
            return(GC_oom_fn(lb));
179
        }
180
        *(void **)op = ptr_to_struct_containing_descr;
181
        UNLOCK();
182
    }
183
    return((GC_PTR) op);
184
}
185
 
186
/* Similar to GC_gcj_malloc, but add debug info.  This is allocated     */
187
/* with GC_gcj_debug_kind.                                              */
188
GC_PTR GC_debug_gcj_malloc(size_t lb, void * ptr_to_struct_containing_descr,
189
                           GC_EXTRA_PARAMS)
190
{
191
    GC_PTR result;
192
 
193
    /* We're careful to avoid extra calls, which could           */
194
    /* confuse the backtrace.                                   */
195
    LOCK();
196
    maybe_finalize();
197
    result = GC_generic_malloc_inner(lb + DEBUG_BYTES, GC_gcj_debug_kind);
198
    if (result == 0) {
199
        UNLOCK();
200
        GC_err_printf2("GC_debug_gcj_malloc(%ld, 0x%lx) returning NIL (",
201
                       (unsigned long) lb,
202
                       (unsigned long) ptr_to_struct_containing_descr);
203
        GC_err_puts(s);
204
        GC_err_printf1(":%ld)\n", (unsigned long)i);
205
        return(GC_oom_fn(lb));
206
    }
207
    *((void **)((ptr_t)result + sizeof(oh))) = ptr_to_struct_containing_descr;
208
    UNLOCK();
209
    if (!GC_debugging_started) {
210
        GC_start_debugging();
211
    }
212
    ADD_CALL_CHAIN(result, ra);
213
    return (GC_store_debug_info(result, (word)lb, s, (word)i));
214
}
215
 
216
/* Similar to GC_gcj_malloc, but the size is in words, and we don't     */
217
/* adjust it.  The size is assumed to be such that it can be    */
218
/* allocated as a small object.                                 */
219
void * GC_gcj_fast_malloc(size_t lw, void * ptr_to_struct_containing_descr)
220
{
221
ptr_t op;
222
ptr_t * opp;
223
DCL_LOCK_STATE;
224
 
225
    opp = &(GC_gcjobjfreelist[lw]);
226
    LOCK();
227
    op = *opp;
228
    if( EXPECT(op == 0, 0) ) {
229
        maybe_finalize();
230
        op = (ptr_t)GC_clear_stack(
231
                GC_generic_malloc_words_small_inner(lw, GC_gcj_kind));
232
        if (0 == op) {
233
            UNLOCK();
234
            return GC_oom_fn(WORDS_TO_BYTES(lw));
235
        }
236
    } else {
237
        *opp = obj_link(op);
238
        GC_words_allocd += lw;
239
    }
240
    *(void **)op = ptr_to_struct_containing_descr;
241
    UNLOCK();
242
    return((GC_PTR) op);
243
}
244
 
245
/* And a debugging version of the above:        */
246
void * GC_debug_gcj_fast_malloc(size_t lw,
247
                                void * ptr_to_struct_containing_descr,
248
                                GC_EXTRA_PARAMS)
249
{
250
    GC_PTR result;
251
    size_t lb = WORDS_TO_BYTES(lw);
252
 
253
    /* We clone the code from GC_debug_gcj_malloc, so that we   */
254
    /* dont end up with extra frames on the stack, which could  */
255
    /* confuse the backtrace.                                   */
256
    LOCK();
257
    maybe_finalize();
258
    result = GC_generic_malloc_inner(lb + DEBUG_BYTES, GC_gcj_debug_kind);
259
    if (result == 0) {
260
        UNLOCK();
261
        GC_err_printf2("GC_debug_gcj_fast_malloc(%ld, 0x%lx) returning NIL (",
262
                       (unsigned long) lw,
263
                       (unsigned long) ptr_to_struct_containing_descr);
264
        GC_err_puts(s);
265
        GC_err_printf1(":%ld)\n", (unsigned long)i);
266
        return GC_oom_fn(WORDS_TO_BYTES(lw));
267
    }
268
    *((void **)((ptr_t)result + sizeof(oh))) = ptr_to_struct_containing_descr;
269
    UNLOCK();
270
    if (!GC_debugging_started) {
271
        GC_start_debugging();
272
    }
273
    ADD_CALL_CHAIN(result, ra);
274
    return (GC_store_debug_info(result, (word)lb, s, (word)i));
275
}
276
 
277
void * GC_gcj_malloc_ignore_off_page(size_t lb,
278
                                     void * ptr_to_struct_containing_descr)
279
{
280
register ptr_t op;
281
register ptr_t * opp;
282
register word lw;
283
DCL_LOCK_STATE;
284
 
285
    if( SMALL_OBJ(lb) ) {
286
#       ifdef MERGE_SIZES
287
          lw = GC_size_map[lb];
288
#       else
289
          lw = ALIGNED_WORDS(lb);
290
#       endif
291
        opp = &(GC_gcjobjfreelist[lw]);
292
        LOCK();
293
        if( (op = *opp) == 0 ) {
294
            maybe_finalize();
295
            op = (ptr_t)GENERAL_MALLOC_IOP(lb, GC_gcj_kind);
296
#           ifdef MERGE_SIZES
297
                lw = GC_size_map[lb];   /* May have been uninitialized. */
298
#           endif
299
        } else {
300
            *opp = obj_link(op);
301
            GC_words_allocd += lw;
302
        }
303
        *(void **)op = ptr_to_struct_containing_descr;
304
        UNLOCK();
305
    } else {
306
        LOCK();
307
        maybe_finalize();
308
        op = (ptr_t)GENERAL_MALLOC_IOP(lb, GC_gcj_kind);
309
        if (0 != op) {
310
          *(void **)op = ptr_to_struct_containing_descr;
311
        }
312
        UNLOCK();
313
    }
314
    return((GC_PTR) op);
315
}
316
 
317
#else
318
 
319
char GC_no_gcj_support;
320
 
321
#endif  /* GC_GCJ_SUPPORT */

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