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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [boehm-gc/] [headers.c] - Blame information for rev 721

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Line No. Rev Author Line
1 721 jeremybenn
/*
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 * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
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 * Copyright (c) 1991-1994 by Xerox Corporation.  All rights reserved.
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 * Copyright (c) 1996 by Silicon Graphics.  All rights reserved.
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 *
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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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 * This implements:
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 * 1. allocation of heap block headers
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 * 2. A map from addresses to heap block addresses to heap block headers
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 *
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 * Access speed is crucial.  We implement an index structure based on a 2
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 * level tree.
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 */
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# include "private/gc_priv.h"
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bottom_index * GC_all_bottom_indices = 0;
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                                /* Pointer to first (lowest addr) */
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                                /* bottom_index.                  */
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bottom_index * GC_all_bottom_indices_end = 0;
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                                /* Pointer to last (highest addr) */
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                                /* bottom_index.                  */
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/* Non-macro version of header location routine */
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hdr * GC_find_header(h)
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ptr_t h;
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{
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#   ifdef HASH_TL
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        register hdr * result;
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        GET_HDR(h, result);
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        return(result);
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#   else
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        return(HDR_INNER(h));
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#   endif
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}
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/* Routines to dynamically allocate collector data structures that will */
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/* never be freed.                                                       */
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static ptr_t scratch_free_ptr = 0;
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/* GC_scratch_last_end_ptr is end point of last obtained scratch area.  */
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/* GC_scratch_end_ptr is end point of current scratch area.             */
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ptr_t GC_scratch_alloc(bytes)
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register word bytes;
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{
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    register ptr_t result = scratch_free_ptr;
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#   ifdef ALIGN_DOUBLE
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#       define GRANULARITY (2 * sizeof(word))
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#   else
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#       define GRANULARITY sizeof(word)
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#   endif
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    bytes += GRANULARITY-1;
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    bytes &= ~(GRANULARITY-1);
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    scratch_free_ptr += bytes;
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    if (scratch_free_ptr <= GC_scratch_end_ptr) {
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        return(result);
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    }
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    {
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        word bytes_to_get = MINHINCR * HBLKSIZE;
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        if (bytes_to_get <= bytes) {
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          /* Undo the damage, and get memory directly */
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            bytes_to_get = bytes;
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#           ifdef USE_MMAP
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                bytes_to_get += GC_page_size - 1;
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                bytes_to_get &= ~(GC_page_size - 1);
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#           endif
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            result = (ptr_t)GET_MEM(bytes_to_get);
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            scratch_free_ptr -= bytes;
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            GC_scratch_last_end_ptr = result + bytes;
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            return(result);
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        }
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        result = (ptr_t)GET_MEM(bytes_to_get);
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        if (result == 0) {
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#           ifdef PRINTSTATS
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                GC_printf0("Out of memory - trying to allocate less\n");
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#           endif
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            scratch_free_ptr -= bytes;
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            bytes_to_get = bytes;
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#           ifdef USE_MMAP
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                bytes_to_get += GC_page_size - 1;
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                bytes_to_get &= ~(GC_page_size - 1);
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#           endif
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            return((ptr_t)GET_MEM(bytes_to_get));
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        }
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        scratch_free_ptr = result;
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        GC_scratch_end_ptr = scratch_free_ptr + bytes_to_get;
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        GC_scratch_last_end_ptr = GC_scratch_end_ptr;
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        return(GC_scratch_alloc(bytes));
104
    }
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}
106
 
107
static hdr * hdr_free_list = 0;
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109
/* Return an uninitialized header */
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static hdr * alloc_hdr()
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{
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    register hdr * result;
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114
    if (hdr_free_list == 0) {
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        result = (hdr *) GC_scratch_alloc((word)(sizeof(hdr)));
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    } else {
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        result = hdr_free_list;
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        hdr_free_list = (hdr *) (result -> hb_next);
119
    }
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    return(result);
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}
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123
static void free_hdr(hhdr)
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hdr * hhdr;
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{
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    hhdr -> hb_next = (struct hblk *) hdr_free_list;
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    hdr_free_list = hhdr;
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}
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130
hdr * GC_invalid_header;
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132
#ifdef USE_HDR_CACHE
133
  word GC_hdr_cache_hits = 0;
134
  word GC_hdr_cache_misses = 0;
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#endif
136
 
137
void GC_init_headers()
138
{
139
    register unsigned i;
140
 
141
    GC_all_nils = (bottom_index *)GC_scratch_alloc((word)sizeof(bottom_index));
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    BZERO(GC_all_nils, sizeof(bottom_index));
143
    for (i = 0; i < TOP_SZ; i++) {
144
        GC_top_index[i] = GC_all_nils;
145
    }
146
    GC_invalid_header = alloc_hdr();
147
    GC_invalidate_map(GC_invalid_header);
148
}
149
 
150
/* Make sure that there is a bottom level index block for address addr  */
151
/* Return FALSE on failure.                                             */
152
static GC_bool get_index(addr)
153
word addr;
154
{
155
    word hi = (word)(addr) >> (LOG_BOTTOM_SZ + LOG_HBLKSIZE);
156
    bottom_index * r;
157
    bottom_index * p;
158
    bottom_index ** prev;
159
    bottom_index *pi;
160
 
161
#   ifdef HASH_TL
162
      unsigned i = TL_HASH(hi);
163
      bottom_index * old;
164
 
165
      old = p = GC_top_index[i];
166
      while(p != GC_all_nils) {
167
          if (p -> key == hi) return(TRUE);
168
          p = p -> hash_link;
169
      }
170
      r = (bottom_index*)GC_scratch_alloc((word)(sizeof (bottom_index)));
171
      if (r == 0) return(FALSE);
172
      BZERO(r, sizeof (bottom_index));
173
      r -> hash_link = old;
174
      GC_top_index[i] = r;
175
#   else
176
      if (GC_top_index[hi] != GC_all_nils) return(TRUE);
177
      r = (bottom_index*)GC_scratch_alloc((word)(sizeof (bottom_index)));
178
      if (r == 0) return(FALSE);
179
      GC_top_index[hi] = r;
180
      BZERO(r, sizeof (bottom_index));
181
#   endif
182
    r -> key = hi;
183
    /* Add it to the list of bottom indices */
184
      prev = &GC_all_bottom_indices;    /* pointer to p */
185
      pi = 0;                            /* bottom_index preceding p */
186
      while ((p = *prev) != 0 && p -> key < hi) {
187
        pi = p;
188
        prev = &(p -> asc_link);
189
      }
190
      r -> desc_link = pi;
191
      if (0 == p) {
192
        GC_all_bottom_indices_end = r;
193
      } else {
194
        p -> desc_link = r;
195
      }
196
      r -> asc_link = p;
197
      *prev = r;
198
    return(TRUE);
199
}
200
 
201
/* Install a header for block h.        */
202
/* The header is uninitialized.         */
203
/* Returns the header or 0 on failure.  */
204
struct hblkhdr * GC_install_header(h)
205
register struct hblk * h;
206
{
207
    hdr * result;
208
 
209
    if (!get_index((word) h)) return(0);
210
    result = alloc_hdr();
211
    SET_HDR(h, result);
212
#   ifdef USE_MUNMAP
213
        result -> hb_last_reclaimed = GC_gc_no;
214
#   endif
215
    return(result);
216
}
217
 
218
/* Set up forwarding counts for block h of size sz */
219
GC_bool GC_install_counts(h, sz)
220
register struct hblk * h;
221
register word sz; /* bytes */
222
{
223
    register struct hblk * hbp;
224
    register int i;
225
 
226
    for (hbp = h; (char *)hbp < (char *)h + sz; hbp += BOTTOM_SZ) {
227
        if (!get_index((word) hbp)) return(FALSE);
228
    }
229
    if (!get_index((word)h + sz - 1)) return(FALSE);
230
    for (hbp = h + 1; (char *)hbp < (char *)h + sz; hbp += 1) {
231
        i = HBLK_PTR_DIFF(hbp, h);
232
        SET_HDR(hbp, (hdr *)(i > MAX_JUMP? MAX_JUMP : i));
233
    }
234
    return(TRUE);
235
}
236
 
237
/* Remove the header for block h */
238
void GC_remove_header(h)
239
register struct hblk * h;
240
{
241
    hdr ** ha;
242
 
243
    GET_HDR_ADDR(h, ha);
244
    free_hdr(*ha);
245
    *ha = 0;
246
}
247
 
248
/* Remove forwarding counts for h */
249
void GC_remove_counts(h, sz)
250
register struct hblk * h;
251
register word sz; /* bytes */
252
{
253
    register struct hblk * hbp;
254
 
255
    for (hbp = h+1; (char *)hbp < (char *)h + sz; hbp += 1) {
256
        SET_HDR(hbp, 0);
257
    }
258
}
259
 
260
/* Apply fn to all allocated blocks */
261
/*VARARGS1*/
262
void GC_apply_to_all_blocks(fn, client_data)
263
void (*fn) GC_PROTO((struct hblk *h, word client_data));
264
word client_data;
265
{
266
    register int j;
267
    register bottom_index * index_p;
268
 
269
    for (index_p = GC_all_bottom_indices; index_p != 0;
270
         index_p = index_p -> asc_link) {
271
        for (j = BOTTOM_SZ-1; j >= 0;) {
272
            if (!IS_FORWARDING_ADDR_OR_NIL(index_p->index[j])) {
273
                if (index_p->index[j]->hb_map != GC_invalid_map) {
274
                    (*fn)(((struct hblk *)
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                              (((index_p->key << LOG_BOTTOM_SZ) + (word)j)
276
                               << LOG_HBLKSIZE)),
277
                          client_data);
278
                }
279
                j--;
280
             } else if (index_p->index[j] == 0) {
281
                j--;
282
             } else {
283
                j -= (word)(index_p->index[j]);
284
             }
285
         }
286
     }
287
}
288
 
289
/* Get the next valid block whose address is at least h */
290
/* Return 0 if there is none.                           */
291
struct hblk * GC_next_used_block(h)
292
struct hblk * h;
293
{
294
    register bottom_index * bi;
295
    register word j = ((word)h >> LOG_HBLKSIZE) & (BOTTOM_SZ-1);
296
 
297
    GET_BI(h, bi);
298
    if (bi == GC_all_nils) {
299
        register word hi = (word)h >> (LOG_BOTTOM_SZ + LOG_HBLKSIZE);
300
        bi = GC_all_bottom_indices;
301
        while (bi != 0 && bi -> key < hi) bi = bi -> asc_link;
302
        j = 0;
303
    }
304
    while(bi != 0) {
305
        while (j < BOTTOM_SZ) {
306
            hdr * hhdr = bi -> index[j];
307
            if (IS_FORWARDING_ADDR_OR_NIL(hhdr)) {
308
                j++;
309
            } else {
310
                if (hhdr->hb_map != GC_invalid_map) {
311
                    return((struct hblk *)
312
                              (((bi -> key << LOG_BOTTOM_SZ) + j)
313
                               << LOG_HBLKSIZE));
314
                } else {
315
                    j += divHBLKSZ(hhdr -> hb_sz);
316
                }
317
            }
318
        }
319
        j = 0;
320
        bi = bi -> asc_link;
321
    }
322
    return(0);
323
}
324
 
325
/* Get the last (highest address) block whose address is        */
326
/* at most h.  Return 0 if there is none.                       */
327
/* Unlike the above, this may return a free block.              */
328
struct hblk * GC_prev_block(h)
329
struct hblk * h;
330
{
331
    register bottom_index * bi;
332
    register signed_word j = ((word)h >> LOG_HBLKSIZE) & (BOTTOM_SZ-1);
333
 
334
    GET_BI(h, bi);
335
    if (bi == GC_all_nils) {
336
        register word hi = (word)h >> (LOG_BOTTOM_SZ + LOG_HBLKSIZE);
337
        bi = GC_all_bottom_indices_end;
338
        while (bi != 0 && bi -> key > hi) bi = bi -> desc_link;
339
        j = BOTTOM_SZ - 1;
340
    }
341
    while(bi != 0) {
342
        while (j >= 0) {
343
            hdr * hhdr = bi -> index[j];
344
            if (0 == hhdr) {
345
                --j;
346
            } else if (IS_FORWARDING_ADDR_OR_NIL(hhdr)) {
347
                j -= (signed_word)hhdr;
348
            } else {
349
                return((struct hblk *)
350
                          (((bi -> key << LOG_BOTTOM_SZ) + j)
351
                               << LOG_HBLKSIZE));
352
            }
353
        }
354
        j = BOTTOM_SZ - 1;
355
        bi = bi -> desc_link;
356
    }
357
    return(0);
358
}

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