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Diff for /OpenXM_contrib2/asir2000/gc/alloc.c between version 1.1.1.1 and 1.3

version 1.1.1.1, 1999/12/03 07:39:09 version 1.3, 2000/12/01 09:26:10
Line 1 
Line 1 
 /*  /*
  * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers   * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
  * Copyright (c) 1991-1994 by Xerox Corporation.  All rights reserved.   * Copyright (c) 1991-1996 by Xerox Corporation.  All rights reserved.
  * Copyright (c) 1998 by Silicon Graphics.  All rights reserved.   * Copyright (c) 1998 by Silicon Graphics.  All rights reserved.
    * Copyright (c) 1999 by Hewlett-Packard Company. All rights reserved.
  *   *
  * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED   * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
  * OR IMPLIED.  ANY USE IS AT YOUR OWN RISK.   * OR IMPLIED.  ANY USE IS AT YOUR OWN RISK.
Line 64  word GC_gc_no = 0;
Line 65  word GC_gc_no = 0;
   int GC_incremental = 0;    /* By default, stop the world.     */    int GC_incremental = 0;    /* By default, stop the world.     */
 #endif  #endif
   
 int GC_full_freq = 4;      /* Every 5th collection is a full    */  int GC_full_freq = 19;     /* Every 20th collection is a full   */
                            /* collection.                       */                             /* collection, whether we need it    */
                              /* or not.                           */
   
   GC_bool GC_need_full_gc = FALSE;
                              /* Need full GC do to heap growth.   */
   
   word GC_used_heap_size_after_full = 0;
   
 char * GC_copyright[] =  char * GC_copyright[] =
 {"Copyright 1988,1989 Hans-J. Boehm and Alan J. Demers ",  {"Copyright 1988,1989 Hans-J. Boehm and Alan J. Demers ",
 "Copyright (c) 1991-1995 by Xerox Corporation.  All rights reserved. ",  "Copyright (c) 1991-1995 by Xerox Corporation.  All rights reserved. ",
Line 213  GC_bool GC_should_collect()
Line 220  GC_bool GC_should_collect()
     return(GC_adj_words_allocd() >= min_words_allocd());      return(GC_adj_words_allocd() >= min_words_allocd());
 }  }
   
   
 void GC_notify_full_gc()  void GC_notify_full_gc()
 {  {
     if (GC_start_call_back != (void (*)())0) {      if (GC_start_call_back != (void (*)())0) {
Line 220  void GC_notify_full_gc()
Line 228  void GC_notify_full_gc()
     }      }
 }  }
   
   GC_bool GC_is_full_gc = FALSE;
   
 /*  /*
  * Initiate a garbage collection if appropriate.   * Initiate a garbage collection if appropriate.
  * Choose judiciously   * Choose judiciously
Line 229  void GC_notify_full_gc()
Line 239  void GC_notify_full_gc()
 void GC_maybe_gc()  void GC_maybe_gc()
 {  {
     static int n_partial_gcs = 0;      static int n_partial_gcs = 0;
     GC_bool is_full_gc = FALSE;  
   
     if (GC_should_collect()) {      if (GC_should_collect()) {
         if (!GC_incremental) {          if (!GC_incremental) {
Line 237  void GC_maybe_gc()
Line 246  void GC_maybe_gc()
             GC_gcollect_inner();              GC_gcollect_inner();
             n_partial_gcs = 0;              n_partial_gcs = 0;
             return;              return;
         } else if (n_partial_gcs >= GC_full_freq) {          } else if (GC_need_full_gc || n_partial_gcs >= GC_full_freq) {
 #           ifdef PRINTSTATS  #           ifdef PRINTSTATS
               GC_printf2(                GC_printf2(
                 "***>Full mark for collection %lu after %ld allocd bytes\n",                  "***>Full mark for collection %lu after %ld allocd bytes\n",
Line 249  void GC_maybe_gc()
Line 258  void GC_maybe_gc()
             GC_clear_marks();              GC_clear_marks();
             n_partial_gcs = 0;              n_partial_gcs = 0;
             GC_notify_full_gc();              GC_notify_full_gc();
             is_full_gc = TRUE;              GC_is_full_gc = TRUE;
         } else {          } else {
             n_partial_gcs++;              n_partial_gcs++;
         }          }
Line 263  void GC_maybe_gc()
Line 272  void GC_maybe_gc()
 #           endif  #           endif
             GC_finish_collection();              GC_finish_collection();
         } else {          } else {
             if (!is_full_gc) {              if (!GC_is_full_gc) {
                 /* Count this as the first attempt */                  /* Count this as the first attempt */
                 GC_n_attempts++;                  GC_n_attempts++;
             }              }
Line 300  GC_stop_func stop_func;
Line 309  GC_stop_func stop_func;
     /* Make sure all blocks have been reclaimed, so sweep routines      */      /* Make sure all blocks have been reclaimed, so sweep routines      */
     /* don't see cleared mark bits.                                     */      /* don't see cleared mark bits.                                     */
     /* If we're guaranteed to finish, then this is unnecessary.         */      /* If we're guaranteed to finish, then this is unnecessary.         */
         if (stop_func != GC_never_stop_func      /* In the find_leak case, we have to finish to guarantee that       */
       /* previously unmarked objects are not reported as leaks.           */
           if ((GC_find_leak || stop_func != GC_never_stop_func)
             && !GC_reclaim_all(stop_func, FALSE)) {              && !GC_reclaim_all(stop_func, FALSE)) {
             /* Aborted.  So far everything is still consistent. */              /* Aborted.  So far everything is still consistent. */
             return(FALSE);              return(FALSE);
Line 310  GC_stop_func stop_func;
Line 321  GC_stop_func stop_func;
 #   ifdef SAVE_CALL_CHAIN  #   ifdef SAVE_CALL_CHAIN
         GC_save_callers(GC_last_stack);          GC_save_callers(GC_last_stack);
 #   endif  #   endif
       GC_is_full_gc = TRUE;
     if (!GC_stopped_mark(stop_func)) {      if (!GC_stopped_mark(stop_func)) {
       if (!GC_incremental) {        if (!GC_incremental) {
         /* We're partially done and have no way to complete or use      */          /* We're partially done and have no way to complete or use      */
Line 481  void GC_finish_collection()
Line 493  void GC_finish_collection()
 #   ifdef GATHERSTATS  #   ifdef GATHERSTATS
         GC_mem_found = 0;          GC_mem_found = 0;
 #   endif  #   endif
 #   ifdef FIND_LEAK      if (GC_find_leak) {
       /* Mark all objects on the free list.  All objects should be */        /* Mark all objects on the free list.  All objects should be */
       /* marked when we're done.                                   */        /* marked when we're done.                                   */
         {          {
Line 504  void GC_finish_collection()
Line 516  void GC_finish_collection()
             }              }
           }            }
         }          }
       /* Check that everything is marked */  
         GC_start_reclaim(TRUE);          GC_start_reclaim(TRUE);
 #   else            /* The above just checks; it doesn't really reclaim anything. */
       }
   
       GC_finalize();      GC_finalize();
 #     ifdef STUBBORN_ALLOC  #   ifdef STUBBORN_ALLOC
         GC_clean_changing_list();        GC_clean_changing_list();
 #     endif  #   endif
   
 #     ifdef PRINTTIMES  #   ifdef PRINTTIMES
         GET_TIME(finalize_time);        GET_TIME(finalize_time);
 #     endif  #   endif
   
       /* Clear free list mark bits, in case they got accidentally marked   */      /* Clear free list mark bits, in case they got accidentally marked   */
       /* Note: HBLKPTR(p) == pointer to head of block containing *p        */      /* Note: HBLKPTR(p) == pointer to head of block containing *p        */
       /* Also subtract memory remaining from GC_mem_found count.           */      /* (or GC_find_leak is set and they were intentionally marked.)      */
       /* Note that composite objects on free list are cleared.             */      /* Also subtract memory remaining from GC_mem_found count.           */
       /* Thus accidentally marking a free list is not a problem;  only     */      /* Note that composite objects on free list are cleared.             */
       /* objects on the list itself will be marked, and that's fixed here. */      /* Thus accidentally marking a free list is not a problem;  only     */
       /* objects on the list itself will be marked, and that's fixed here. */
       {        {
         register word size;             /* current object size          */          register word size;             /* current object size          */
         register ptr_t p;       /* pointer to current object    */          register ptr_t p;       /* pointer to current object    */
Line 548  void GC_finish_collection()
Line 561  void GC_finish_collection()
       }        }
   
   
 #     ifdef PRINTSTATS  #   ifdef PRINTSTATS
         GC_printf1("Bytes recovered before sweep - f.l. count = %ld\n",          GC_printf1("Bytes recovered before sweep - f.l. count = %ld\n",
                   (long)WORDS_TO_BYTES(GC_mem_found));                    (long)WORDS_TO_BYTES(GC_mem_found));
 #     endif  #   endif
   
     /* Reconstruct free lists to contain everything not marked */      /* Reconstruct free lists to contain everything not marked */
       GC_start_reclaim(FALSE);          GC_start_reclaim(FALSE);
           if (GC_is_full_gc)  {
 #   endif /* !FIND_LEAK */              GC_used_heap_size_after_full = USED_HEAP_SIZE;
               GC_need_full_gc = FALSE;
           } else {
               GC_need_full_gc =
                    BYTES_TO_WORDS(USED_HEAP_SIZE - GC_used_heap_size_after_full)
                    > min_words_allocd();
           }
   
 #   ifdef PRINTSTATS  #   ifdef PRINTSTATS
         GC_printf2(          GC_printf2(
Line 573  void GC_finish_collection()
Line 591  void GC_finish_collection()
 #   endif  #   endif
   
       GC_n_attempts = 0;        GC_n_attempts = 0;
         GC_is_full_gc = FALSE;
     /* Reset or increment counters for next cycle */      /* Reset or increment counters for next cycle */
       GC_words_allocd_before_gc += GC_words_allocd;        GC_words_allocd_before_gc += GC_words_allocd;
       GC_non_gc_bytes_at_gc = GC_non_gc_bytes;        GC_non_gc_bytes_at_gc = GC_non_gc_bytes;
Line 640  word bytes;
Line 659  word bytes;
     if (GC_n_heap_sects >= MAX_HEAP_SECTS) {      if (GC_n_heap_sects >= MAX_HEAP_SECTS) {
         ABORT("Too many heap sections: Increase MAXHINCR or MAX_HEAP_SECTS");          ABORT("Too many heap sections: Increase MAXHINCR or MAX_HEAP_SECTS");
     }      }
     if (!GC_install_header(p)) {      phdr = GC_install_header(p);
       if (0 == phdr) {
         /* This is extremely unlikely. Can't add it.  This will         */          /* This is extremely unlikely. Can't add it.  This will         */
         /* almost certainly result in a 0 return from the allocator,    */          /* almost certainly result in a 0 return from the allocator,    */
         /* which is entirely appropriate.                               */          /* which is entirely appropriate.                               */
Line 650  word bytes;
Line 670  word bytes;
     GC_heap_sects[GC_n_heap_sects].hs_bytes = bytes;      GC_heap_sects[GC_n_heap_sects].hs_bytes = bytes;
     GC_n_heap_sects++;      GC_n_heap_sects++;
     words = BYTES_TO_WORDS(bytes - HDR_BYTES);      words = BYTES_TO_WORDS(bytes - HDR_BYTES);
     phdr = HDR(p);  
     phdr -> hb_sz = words;      phdr -> hb_sz = words;
     phdr -> hb_map = (char *)1;   /* A value != GC_invalid_map  */      phdr -> hb_map = (char *)1;   /* A value != GC_invalid_map  */
     phdr -> hb_flags = 0;      phdr -> hb_flags = 0;
Line 669  word bytes;
Line 688  word bytes;
     }      }
 }  }
   
 #ifdef PRESERVE_LAST  
   
 GC_bool GC_protect_last_block = FALSE;  
   
 GC_bool GC_in_last_heap_sect(p)  
 ptr_t p;  
 {  
     struct HeapSect * last_heap_sect;  
     ptr_t start;  
     ptr_t end;  
   
     if (!GC_protect_last_block) return FALSE;  
     last_heap_sect = &(GC_heap_sects[GC_n_heap_sects-1]);  
     start = last_heap_sect -> hs_start;  
     if (p < start) return FALSE;  
     end = start + last_heap_sect -> hs_bytes;  
     if (p >= end) return FALSE;  
     return TRUE;  
 }  
 #endif  
   
 # if !defined(NO_DEBUGGING)  # if !defined(NO_DEBUGGING)
 void GC_print_heap_sects()  void GC_print_heap_sects()
 {  {
Line 823  word n;
Line 821  word n;
     LOCK();      LOCK();
     if (!GC_is_initialized) GC_init_inner();      if (!GC_is_initialized) GC_init_inner();
     result = (int)GC_expand_hp_inner(divHBLKSZ((word)bytes));      result = (int)GC_expand_hp_inner(divHBLKSZ((word)bytes));
 #   ifdef PRESERVE_LAST      if (result) GC_requested_heapsize += bytes;
         if (result) GC_protect_last_block = FALSE;  
 #   endif  
     UNLOCK();      UNLOCK();
     ENABLE_SIGNALS();      ENABLE_SIGNALS();
     return(result);      return(result);
Line 839  GC_bool GC_collect_or_expand(needed_blocks, ignore_off
Line 835  GC_bool GC_collect_or_expand(needed_blocks, ignore_off
 word needed_blocks;  word needed_blocks;
 GC_bool ignore_off_page;  GC_bool ignore_off_page;
 {  {
     if (!GC_incremental && !GC_dont_gc && GC_should_collect()) {      if (!GC_incremental && !GC_dont_gc &&
           (GC_dont_expand && GC_words_allocd > 0 || GC_should_collect())) {
       GC_notify_full_gc();        GC_notify_full_gc();
       GC_gcollect_inner();        GC_gcollect_inner();
     } else {      } else {
Line 877  GC_bool ignore_off_page;
Line 874  GC_bool ignore_off_page;
               GC_printf0("Memory available again ...\n");                GC_printf0("Memory available again ...\n");
             }              }
 #         endif  #         endif
 #         ifdef PRESERVE_LAST  
             if (needed_blocks > 1) GC_protect_last_block = TRUE;  
                 /* We were forced to expand the heap as the result      */  
                 /* of a large block allocation.  Avoid breaking up      */  
                 /* new block into small pieces.                         */  
 #         endif  
       }        }
     }      }
     return(TRUE);      return(TRUE);
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