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version 1.3, 2000/12/01 09:26:10 version 1.4, 2001/04/20 07:39:18
Line 2 
Line 2 
  * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers   * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
  * Copyright (c) 1991-1995 by Xerox Corporation.  All rights reserved.   * Copyright (c) 1991-1995 by Xerox Corporation.  All rights reserved.
  * Copyright (c) 1997 by Silicon Graphics.  All rights reserved.   * Copyright (c) 1997 by Silicon Graphics.  All rights reserved.
  * Copyright (c) 1999 by Hewlett-Packard Company.  All rights reserved.   * Copyright (c) 1999-2000 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 14 
Line 14 
  * modified is included with the above copyright notice.   * modified is included with the above copyright notice.
  */   */
   
 #include "dbg_mlc.h"  #include "private/dbg_mlc.h"
   
 void GC_default_print_heap_obj_proc();  void GC_default_print_heap_obj_proc();
 GC_API void GC_register_finalizer_no_order  GC_API void GC_register_finalizer_no_order
Line 22  GC_API void GC_register_finalizer_no_order
Line 22  GC_API void GC_register_finalizer_no_order
                   GC_finalization_proc *ofn, GC_PTR *ocd));                    GC_finalization_proc *ofn, GC_PTR *ocd));
   
   
   #ifndef SHORT_DBG_HDRS
 /* Check whether object with base pointer p has debugging info  */  /* Check whether object with base pointer p has debugging info  */
 /* p is assumed to point to a legitimate object in our part     */  /* p is assumed to point to a legitimate object in our part     */
 /* of the heap.                                                 */  /* of the heap.                                                 */
 GC_bool GC_has_debug_info(p)  /* This excludes the check as to whether tha back pointer is    */
   /* odd, which is added by the GC_HAS_DEBUG_INFO macro.          */
   /* Note that if DBG_HDRS_ALL is set, uncollectable objects      */
   /* on free lists may not have debug information set.  Thus it's */
   /* not always safe to return TRUE, even if the client does      */
   /* its part.                                                    */
   GC_bool GC_has_other_debug_info(p)
 ptr_t p;  ptr_t p;
 {  {
     register oh * ohdr = (oh *)p;      register oh * ohdr = (oh *)p;
Line 46  ptr_t p;
Line 53  ptr_t p;
     }      }
     return(FALSE);      return(FALSE);
 }  }
   #endif
   
 #ifdef KEEP_BACK_PTRS  #ifdef KEEP_BACK_PTRS
   
   # include <stdlib.h>
   
   # if defined(LINUX) || defined(SUNOS4) || defined(SUNOS5) \
        || defined(HPUX) || defined(IRIX) || defined(OSF1)
   #   define RANDOM() random()
   # else
   #   define RANDOM() (long)rand()
   # endif
   
   /* Store back pointer to source in dest, if that appears to be possible. */    /* Store back pointer to source in dest, if that appears to be possible. */
   /* This is not completely safe, since we may mistakenly conclude that    */    /* This is not completely safe, since we may mistakenly conclude that    */
   /* dest has a debugging wrapper.  But the error probability is very      */    /* dest has a debugging wrapper.  But the error probability is very      */
Line 56  ptr_t p;
Line 74  ptr_t p;
   /* be a pointer to the interior of an object.                            */    /* be a pointer to the interior of an object.                            */
   void GC_store_back_pointer(ptr_t source, ptr_t dest)    void GC_store_back_pointer(ptr_t source, ptr_t dest)
   {    {
     if (GC_has_debug_info(dest)) {      if (GC_HAS_DEBUG_INFO(dest)) {
       ((oh *)dest) -> oh_back_ptr = (ptr_t)HIDE_POINTER(source);        ((oh *)dest) -> oh_back_ptr = HIDE_BACK_PTR(source);
     }      }
   }    }
   
Line 76  ptr_t p;
Line 94  ptr_t p;
     oh * hdr = (oh *)GC_base(dest);      oh * hdr = (oh *)GC_base(dest);
     ptr_t bp;      ptr_t bp;
     ptr_t bp_base;      ptr_t bp_base;
     if (!GC_has_debug_info((ptr_t) hdr)) return GC_NO_SPACE;      if (!GC_HAS_DEBUG_INFO((ptr_t) hdr)) return GC_NO_SPACE;
     bp = hdr -> oh_back_ptr;      bp = REVEAL_POINTER(hdr -> oh_back_ptr);
     if (MARKED_FOR_FINALIZATION == bp) return GC_FINALIZER_REFD;      if (MARKED_FOR_FINALIZATION == bp) return GC_FINALIZER_REFD;
     if (MARKED_FROM_REGISTER == bp) return GC_REFD_FROM_REG;      if (MARKED_FROM_REGISTER == bp) return GC_REFD_FROM_REG;
     if (0 == bp) return GC_UNREFERENCED;      if (NOT_MARKED == bp) return GC_UNREFERENCED;
     bp = REVEAL_POINTER(bp);  #   if ALIGNMENT == 1
         /* Heuristically try to fix off by 1 errors we introduced by      */
         /* insisting on even addresses.                                   */
         {
           ptr_t alternate_ptr = bp + 1;
           ptr_t target = *(ptr_t *)bp;
           ptr_t alternate_target = *(ptr_t *)alternate_ptr;
   
           if (alternate_target >= GC_least_plausible_heap_addr
               && alternate_target <= GC_greatest_plausible_heap_addr
               && (target < GC_least_plausible_heap_addr
                   || target > GC_greatest_plausible_heap_addr)) {
               bp = alternate_ptr;
           }
         }
   #   endif
     bp_base = GC_base(bp);      bp_base = GC_base(bp);
     if (0 == bp_base) {      if (0 == bp_base) {
       *base_p = bp;        *base_p = bp;
       *offset_p = 0;        *offset_p = 0;
       return GC_REFD_FROM_ROOT;        return GC_REFD_FROM_ROOT;
     } else {      } else {
       if (GC_has_debug_info(bp_base)) bp_base += sizeof(oh);        if (GC_HAS_DEBUG_INFO(bp_base)) bp_base += sizeof(oh);
       *base_p = bp_base;        *base_p = bp_base;
       *offset_p = bp - bp_base;        *offset_p = bp - bp_base;
       return GC_REFD_FROM_HEAP;        return GC_REFD_FROM_HEAP;
Line 101  ptr_t p;
Line 134  ptr_t p;
   void *GC_generate_random_heap_address(void)    void *GC_generate_random_heap_address(void)
   {    {
     int i;      int i;
     int heap_offset = random() % GC_heapsize;      long heap_offset = RANDOM();
       if (GC_heapsize > RAND_MAX) {
           heap_offset *= RAND_MAX;
           heap_offset += RANDOM();
       }
       heap_offset %= GC_heapsize;
           /* This doesn't yield a uniform distribution, especially if     */
           /* e.g. RAND_MAX = 1.5* GC_heapsize.  But for typical cases,    */
           /* it's not too bad.                                            */
     for (i = 0; i < GC_n_heap_sects; ++ i) {      for (i = 0; i < GC_n_heap_sects; ++ i) {
         int size = GC_heap_sects[i].hs_bytes;          int size = GC_heap_sects[i].hs_bytes;
         if (heap_offset < size) {          if (heap_offset < size) {
Line 203  word integer;
Line 244  word integer;
     /* inconsistent while we're in the handler.                         */      /* inconsistent while we're in the handler.                         */
     LOCK();      LOCK();
 #   ifdef KEEP_BACK_PTRS  #   ifdef KEEP_BACK_PTRS
       ((oh *)p) -> oh_back_ptr = 0;        ((oh *)p) -> oh_back_ptr = HIDE_BACK_PTR(NOT_MARKED);
 #   endif  #   endif
     ((oh *)p) -> oh_string = string;      ((oh *)p) -> oh_string = string;
     ((oh *)p) -> oh_int = integer;      ((oh *)p) -> oh_int = integer;
     ((oh *)p) -> oh_sz = sz;  #   ifndef SHORT_DBG_HDRS
     ((oh *)p) -> oh_sf = START_FLAG ^ (word)result;        ((oh *)p) -> oh_sz = sz;
     ((word *)p)[BYTES_TO_WORDS(GC_size(p))-1] =        ((oh *)p) -> oh_sf = START_FLAG ^ (word)result;
         ((word *)p)[BYTES_TO_WORDS(GC_size(p))-1] =
          result[ROUNDED_UP_WORDS(sz)] = END_FLAG ^ (word)result;           result[ROUNDED_UP_WORDS(sz)] = END_FLAG ^ (word)result;
   #   endif
     UNLOCK();      UNLOCK();
     return((ptr_t)result);      return((ptr_t)result);
 }  }
   
   #ifdef DBG_HDRS_ALL
   /* Store debugging info into p.  Return displaced pointer.         */
   /* This version assumes we do hold the allocation lock.            */
   ptr_t GC_store_debug_info_inner(p, sz, string, integer)
   register ptr_t p;       /* base pointer */
   word sz;        /* bytes */
   char * string;
   word integer;
   {
       register word * result = (word *)((oh *)p + 1);
   
       /* There is some argument that we should disable signals here.      */
       /* But that's expensive.  And this way things should only appear    */
       /* inconsistent while we're in the handler.                         */
   #   ifdef KEEP_BACK_PTRS
         ((oh *)p) -> oh_back_ptr = 0;
   #   endif
       ((oh *)p) -> oh_string = string;
       ((oh *)p) -> oh_int = integer;
   #   ifndef SHORT_DBG_HDRS
         ((oh *)p) -> oh_sz = sz;
         ((oh *)p) -> oh_sf = START_FLAG ^ (word)result;
         ((word *)p)[BYTES_TO_WORDS(GC_size(p))-1] =
            result[ROUNDED_UP_WORDS(sz)] = END_FLAG ^ (word)result;
   #   endif
       return((ptr_t)result);
   }
   #endif
   
   #ifndef SHORT_DBG_HDRS
 /* Check the object with debugging info at ohdr         */  /* Check the object with debugging info at ohdr         */
 /* return NIL if it's OK.  Else return clobbered        */  /* return NIL if it's OK.  Else return clobbered        */
 /* address.                                             */  /* address.                                             */
Line 238  register oh * ohdr;
Line 311  register oh * ohdr;
     }      }
     return(0);      return(0);
 }  }
   #endif /* !SHORT_DBG_HDRS */
   
 void GC_print_obj(p)  void GC_print_obj(p)
 ptr_t p;  ptr_t p;
Line 246  ptr_t p;
Line 320  ptr_t p;
   
     GC_err_printf1("0x%lx (", ((unsigned long)ohdr + sizeof(oh)));      GC_err_printf1("0x%lx (", ((unsigned long)ohdr + sizeof(oh)));
     GC_err_puts(ohdr -> oh_string);      GC_err_puts(ohdr -> oh_string);
     GC_err_printf2(":%ld, sz=%ld)\n", (unsigned long)(ohdr -> oh_int),  #   ifdef SHORT_DBG_HDRS
                                       (unsigned long)(ohdr -> oh_sz));        GC_err_printf1(":%ld, sz=%ld)\n", (unsigned long)(ohdr -> oh_int));
   #   else
         GC_err_printf2(":%ld, sz=%ld)\n", (unsigned long)(ohdr -> oh_int),
                                           (unsigned long)(ohdr -> oh_sz));
   #   endif
     PRINT_CALL_CHAIN(ohdr);      PRINT_CALL_CHAIN(ohdr);
 }  }
   
 void GC_debug_print_heap_obj_proc(p)  # if defined(__STDC__) || defined(__cplusplus)
 ptr_t p;      void GC_debug_print_heap_obj_proc(ptr_t p)
   # else
       void GC_debug_print_heap_obj_proc(p)
       ptr_t p;
   # endif
 {  {
     if (GC_has_debug_info(p)) {      if (GC_HAS_DEBUG_INFO(p)) {
         GC_print_obj(p);          GC_print_obj(p);
     } else {      } else {
         GC_default_print_heap_obj_proc(p);          GC_default_print_heap_obj_proc(p);
     }      }
 }  }
   
   #ifndef SHORT_DBG_HDRS
 void GC_print_smashed_obj(p, clobbered_addr)  void GC_print_smashed_obj(p, clobbered_addr)
 ptr_t p, clobbered_addr;  ptr_t p, clobbered_addr;
 {  {
Line 283  ptr_t p, clobbered_addr;
Line 366  ptr_t p, clobbered_addr;
         PRINT_CALL_CHAIN(ohdr);          PRINT_CALL_CHAIN(ohdr);
     }      }
 }  }
   #endif
   
 void GC_check_heap_proc();  void GC_check_heap_proc GC_PROTO((void));
   
   void GC_do_nothing() {}
   
 void GC_start_debugging()  void GC_start_debugging()
 {  {
     GC_check_heap = GC_check_heap_proc;  #   ifndef SHORT_DBG_HDRS
         GC_check_heap = GC_check_heap_proc;
   #   else
         GC_check_heap = GC_do_nothing;
   #   endif
     GC_print_heap_obj = GC_debug_print_heap_obj_proc;      GC_print_heap_obj = GC_debug_print_heap_obj_proc;
     GC_debugging_started = TRUE;      GC_debugging_started = TRUE;
     GC_register_displacement((word)sizeof(oh));      GC_register_displacement((word)sizeof(oh));
Line 333  void GC_start_debugging()
Line 423  void GC_start_debugging()
     return (GC_store_debug_info(result, (word)lb, s, (word)i));      return (GC_store_debug_info(result, (word)lb, s, (word)i));
 }  }
   
   # ifdef DBG_HDRS_ALL
   /*
    * An allocation function for internal use.
    * Normally internally allocated objects do not have debug information.
    * But in this case, we need to make sure that all objects have debug
    * headers.
    * We assume debugging was started in collector initialization,
    * and we already hold the GC lock.
    */
     GC_PTR GC_debug_generic_malloc_inner(size_t lb, int k)
     {
       GC_PTR result = GC_generic_malloc_inner(lb + DEBUG_BYTES, k);
   
       if (result == 0) {
           GC_err_printf1("GC internal allocation (%ld bytes) returning NIL\n",
                          (unsigned long) lb);
           return(0);
       }
       ADD_CALL_CHAIN(result, ra);
       return (GC_store_debug_info_inner(result, (word)lb, "INTERNAL", (word)0));
     }
   
     GC_PTR GC_debug_generic_malloc_inner_ignore_off_page(size_t lb, int k)
     {
       GC_PTR result = GC_generic_malloc_inner_ignore_off_page(
                                                   lb + DEBUG_BYTES, k);
   
       if (result == 0) {
           GC_err_printf1("GC internal allocation (%ld bytes) returning NIL\n",
                          (unsigned long) lb);
           return(0);
       }
       ADD_CALL_CHAIN(result, ra);
       return (GC_store_debug_info_inner(result, (word)lb, "INTERNAL", (word)0));
     }
   # endif
   
 #ifdef STUBBORN_ALLOC  #ifdef STUBBORN_ALLOC
 # ifdef __STDC__  # ifdef __STDC__
     GC_PTR GC_debug_malloc_stubborn(size_t lb, GC_EXTRA_PARAMS)      GC_PTR GC_debug_malloc_stubborn(size_t lb, GC_EXTRA_PARAMS)
Line 525  GC_PTR p;
Line 652  GC_PTR p;
                   "GC_debug_free called on pointer %lx wo debugging info\n",                    "GC_debug_free called on pointer %lx wo debugging info\n",
                   (unsigned long)p);                    (unsigned long)p);
     } else {      } else {
       clobbered = GC_check_annotated_obj((oh *)base);  #     ifndef SHORT_DBG_HDRS
       if (clobbered != 0) {          clobbered = GC_check_annotated_obj((oh *)base);
         if (((oh *)base) -> oh_sz == GC_size(base)) {          if (clobbered != 0) {
             if (((oh *)base) -> oh_sz == GC_size(base)) {
             GC_err_printf0(              GC_err_printf0(
                   "GC_debug_free: found previously deallocated (?) object at ");                    "GC_debug_free: found previously deallocated (?) object at ");
         } else {            } else {
             GC_err_printf0("GC_debug_free: found smashed location at ");              GC_err_printf0("GC_debug_free: found smashed location at ");
             }
             GC_print_smashed_obj(p, clobbered);
         }          }
         GC_print_smashed_obj(p, clobbered);          /* Invalidate size */
       }          ((oh *)base) -> oh_sz = GC_size(base);
       /* Invalidate size */  #     endif /* SHORT_DBG_HDRS */
       ((oh *)base) -> oh_sz = GC_size(base);  
     }      }
     if (GC_find_leak) {      if (GC_find_leak) {
         GC_free(base);          GC_free(base);
Line 556  GC_PTR p;
Line 685  GC_PTR p;
     } /* !GC_find_leak */      } /* !GC_find_leak */
 }  }
   
   #ifdef THREADS
   
   extern void GC_free_inner(GC_PTR p);
   
   /* Used internally; we assume it's called correctly.    */
   void GC_debug_free_inner(GC_PTR p)
   {
       GC_free_inner(GC_base(p));
   }
   #endif
   
 # ifdef __STDC__  # ifdef __STDC__
     GC_PTR GC_debug_realloc(GC_PTR p, size_t lb, GC_EXTRA_PARAMS)      GC_PTR GC_debug_realloc(GC_PTR p, size_t lb, GC_EXTRA_PARAMS)
 # else  # else
Line 610  GC_PTR p;
Line 750  GC_PTR p;
         GC_err_printf0("GC_debug_realloc: encountered bad kind\n");          GC_err_printf0("GC_debug_realloc: encountered bad kind\n");
         ABORT("bad kind");          ABORT("bad kind");
     }      }
     clobbered = GC_check_annotated_obj((oh *)base);  #   ifdef SHORT_DBG_HDRS
     if (clobbered != 0) {        old_sz = GC_size(base) - sizeof(oh);
   #   else
         clobbered = GC_check_annotated_obj((oh *)base);
         if (clobbered != 0) {
         GC_err_printf0("GC_debug_realloc: found smashed location at ");          GC_err_printf0("GC_debug_realloc: found smashed location at ");
         GC_print_smashed_obj(p, clobbered);          GC_print_smashed_obj(p, clobbered);
     }        }
     old_sz = ((oh *)base) -> oh_sz;        old_sz = ((oh *)base) -> oh_sz;
   #   endif
     if (old_sz < copy_sz) copy_sz = old_sz;      if (old_sz < copy_sz) copy_sz = old_sz;
     if (result == 0) return(0);      if (result == 0) return(0);
     BCOPY(p, result,  copy_sz);      BCOPY(p, result,  copy_sz);
Line 623  GC_PTR p;
Line 767  GC_PTR p;
     return(result);      return(result);
 }  }
   
   #ifndef SHORT_DBG_HDRS
 /* Check all marked objects in the given block for validity */  /* Check all marked objects in the given block for validity */
 /*ARGSUSED*/  /*ARGSUSED*/
 void GC_check_heap_block(hbp, dummy)  # if defined(__STDC__) || defined(__cplusplus)
 register struct hblk *hbp;      /* ptr to current heap block            */      void GC_check_heap_block(register struct hblk *hbp, word dummy)
 word dummy;  # else
       void GC_check_heap_block(hbp, dummy)
       register struct hblk *hbp;  /* ptr to current heap block            */
       word dummy;
   # endif
 {  {
     register struct hblkhdr * hhdr = HDR(hbp);      register struct hblkhdr * hhdr = HDR(hbp);
     register word sz = hhdr -> hb_sz;      register word sz = hhdr -> hb_sz;
Line 635  word dummy;
Line 784  word dummy;
     register word *p, *plim;      register word *p, *plim;
   
     p = (word *)(hbp->hb_body);      p = (word *)(hbp->hb_body);
     word_no = HDR_WORDS;      word_no = 0;
     if (sz > MAXOBJSZ) {      if (sz > MAXOBJSZ) {
         plim = p;          plim = p;
     } else {      } else {
Line 644  word dummy;
Line 793  word dummy;
     /* go through all words in block */      /* go through all words in block */
         while( p <= plim ) {          while( p <= plim ) {
             if( mark_bit_from_hdr(hhdr, word_no)              if( mark_bit_from_hdr(hhdr, word_no)
                 && GC_has_debug_info((ptr_t)p)) {                  && GC_HAS_DEBUG_INFO((ptr_t)p)) {
                 ptr_t clobbered = GC_check_annotated_obj((oh *)p);                  ptr_t clobbered = GC_check_annotated_obj((oh *)p);
   
                 if (clobbered != 0) {                  if (clobbered != 0) {
Line 671  void GC_check_heap_proc()
Line 820  void GC_check_heap_proc()
     GC_apply_to_all_blocks(GC_check_heap_block, (word)0);      GC_apply_to_all_blocks(GC_check_heap_block, (word)0);
 }  }
   
   #endif /* !SHORT_DBG_HDRS */
   
 struct closure {  struct closure {
     GC_finalization_proc cl_fn;      GC_finalization_proc cl_fn;
     GC_PTR cl_data;      GC_PTR cl_data;
Line 685  struct closure {
Line 836  struct closure {
 # endif  # endif
 {  {
     struct closure * result =      struct closure * result =
                 (struct closure *) GC_malloc(sizeof (struct closure));  #               ifdef DBG_HDRS_ALL
                     (struct closure *) GC_debug_malloc(sizeof (struct closure),
                                                        GC_EXTRAS);
   #               else
                     (struct closure *) GC_malloc(sizeof (struct closure));
   #               endif
   
     result -> cl_fn = fn;      result -> cl_fn = fn;
     result -> cl_data = data;      result -> cl_data = data;
Line 777  struct closure {
Line 933  struct closure {
     }      }
     GC_register_finalizer_ignore_self(base, GC_debug_invoke_finalizer,      GC_register_finalizer_ignore_self(base, GC_debug_invoke_finalizer,
                                       GC_make_closure(fn,cd), ofn, ocd);                                        GC_make_closure(fn,cd), ofn, ocd);
   }
   
   GC_PTR GC_debug_malloc_replacement(lb)
   size_t lb;
   {
       return GC_debug_malloc(lb, "unknown", 0);
   }
   
   GC_PTR GC_debug_realloc_replacement(p, lb)
   GC_PTR p;
   size_t lb;
   {
       return GC_debug_realloc(p, lb, "unknown", 0);
 }  }
Legend:
Removed from v.1.3  
changed lines
  Added in v.1.4
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