Initial revision

1 files changed, 829 insertions, 0 deletions

diff --git a/gc/misc.c b/gc/misc.c
new file mode 100644
index 0000000..e0d4599
--- /dev/null
+++ b/gc/misc.c
@@ -0,0 +1,829 @@
+/* 
+ * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
+ * Copyright (c) 1991-1994 by Xerox Corporation.  All rights reserved.
+ *
+ * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
+ * OR IMPLIED.  ANY USE IS AT YOUR OWN RISK.
+ *
+ * Permission is hereby granted to use or copy this program
+ * for any purpose,  provided the above notices are retained on all copies.
+ * Permission to modify the code and to distribute modified code is granted,
+ * provided the above notices are retained, and a notice that the code was
+ * modified is included with the above copyright notice.
+ */
+/* Boehm, July 31, 1995 5:02 pm PDT */
+
+
+#include <stdio.h>
+#include <signal.h>
+
+#define I_HIDE_POINTERS	/* To make GC_call_with_alloc_lock visible */
+#include "gc_priv.h"
+
+#ifdef SOLARIS_THREADS
+# include <sys/syscall.h>
+#endif
+#ifdef MSWIN32
+# include <windows.h>
+#endif
+
+# ifdef THREADS
+#   ifdef PCR
+#     include "il/PCR_IL.h"
+      PCR_Th_ML GC_allocate_ml;
+#   else
+#     ifdef SRC_M3
+	/* Critical section counter is defined in the M3 runtime 	*/
+	/* That's all we use.						*/
+#     else
+#	ifdef SOLARIS_THREADS
+	  mutex_t GC_allocate_ml;	/* Implicitly initialized.	*/
+#	else
+#          ifdef WIN32_THREADS
+	      GC_API CRITICAL_SECTION GC_allocate_ml;
+#          else
+#             if defined(IRIX_THREADS) || defined(LINUX_THREADS) \
+		 || defined(IRIX_JDK_THREADS)
+#		ifdef UNDEFINED
+		    pthread_mutex_t GC_allocate_ml = PTHREAD_MUTEX_INITIALIZER;
+#		endif
+	        pthread_t GC_lock_holder = NO_THREAD;
+#	      else
+	        --> declare allocator lock here
+#	      endif
+#	   endif
+#	endif
+#     endif
+#   endif
+# endif
+
+GC_FAR struct _GC_arrays GC_arrays /* = { 0 } */;
+
+
+GC_bool GC_debugging_started = FALSE;
+	/* defined here so we don't have to load debug_malloc.o */
+
+void (*GC_check_heap)() = (void (*)())0;
+
+void (*GC_start_call_back)() = (void (*)())0;
+
+ptr_t GC_stackbottom = 0;
+
+GC_bool GC_dont_gc = 0;
+
+GC_bool GC_quiet = 0;
+
+#ifdef FIND_LEAK
+  int GC_find_leak = 1;
+#else
+  int GC_find_leak = 0;
+#endif
+
+/*ARGSUSED*/
+GC_PTR GC_default_oom_fn GC_PROTO((size_t bytes_requested))
+{
+    return(0);
+}
+
+GC_PTR (*GC_oom_fn) GC_PROTO((size_t bytes_requested)) = GC_default_oom_fn;
+
+extern signed_word GC_mem_found;
+
+# ifdef MERGE_SIZES
+    /* Set things up so that GC_size_map[i] >= words(i),		*/
+    /* but not too much bigger						*/
+    /* and so that size_map contains relatively few distinct entries 	*/
+    /* This is stolen from Russ Atkinson's Cedar quantization		*/
+    /* alogrithm (but we precompute it).				*/
+
+
+    void GC_init_size_map()
+    {
+	register unsigned i;
+
+	/* Map size 0 to 1.  This avoids problems at lower levels. */
+	  GC_size_map[0] = 1;
+	/* One word objects don't have to be 2 word aligned.	   */
+	  for (i = 1; i < sizeof(word); i++) {
+	      GC_size_map[i] = 1;
+	  }
+	  GC_size_map[sizeof(word)] = ROUNDED_UP_WORDS(sizeof(word));
+	for (i = sizeof(word) + 1; i <= 8 * sizeof(word); i++) {
+#           ifdef ALIGN_DOUBLE
+	      GC_size_map[i] = (ROUNDED_UP_WORDS(i) + 1) & (~1);
+#           else
+	      GC_size_map[i] = ROUNDED_UP_WORDS(i);
+#           endif
+	}
+	for (i = 8*sizeof(word) + 1; i <= 16 * sizeof(word); i++) {
+	      GC_size_map[i] = (ROUNDED_UP_WORDS(i) + 1) & (~1);
+	}
+	/* We leave the rest of the array to be filled in on demand. */
+    }
+    
+    /* Fill in additional entries in GC_size_map, including the ith one */
+    /* We assume the ith entry is currently 0.				*/
+    /* Note that a filled in section of the array ending at n always    */
+    /* has length at least n/4.						*/
+    void GC_extend_size_map(i)
+    word i;
+    {
+        word orig_word_sz = ROUNDED_UP_WORDS(i);
+        word word_sz = orig_word_sz;
+    	register word byte_sz = WORDS_TO_BYTES(word_sz);
+    				/* The size we try to preserve.		*/
+    				/* Close to to i, unless this would	*/
+    				/* introduce too many distinct sizes.	*/
+    	word smaller_than_i = byte_sz - (byte_sz >> 3);
+    	word much_smaller_than_i = byte_sz - (byte_sz >> 2);
+    	register word low_limit;	/* The lowest indexed entry we 	*/
+    					/* initialize.			*/
+    	register word j;
+    	
+    	if (GC_size_map[smaller_than_i] == 0) {
+    	    low_limit = much_smaller_than_i;
+    	    while (GC_size_map[low_limit] != 0) low_limit++;
+    	} else {
+    	    low_limit = smaller_than_i + 1;
+    	    while (GC_size_map[low_limit] != 0) low_limit++;
+    	    word_sz = ROUNDED_UP_WORDS(low_limit);
+    	    word_sz += word_sz >> 3;
+    	    if (word_sz < orig_word_sz) word_sz = orig_word_sz;
+    	}
+#	ifdef ALIGN_DOUBLE
+	    word_sz += 1;
+	    word_sz &= ~1;
+#	endif
+	if (word_sz > MAXOBJSZ) {
+	    word_sz = MAXOBJSZ;
+	}
+	/* If we can fit the same number of larger objects in a block,	*/
+	/* do so.							*/ 
+	{
+	    size_t number_of_objs = BODY_SZ/word_sz;
+	    word_sz = BODY_SZ/number_of_objs;
+#	    ifdef ALIGN_DOUBLE
+		word_sz &= ~1;
+#	    endif
+	}
+    	byte_sz = WORDS_TO_BYTES(word_sz);
+#	ifdef ADD_BYTE_AT_END
+	    /* We need one extra byte; don't fill in GC_size_map[byte_sz] */
+	    byte_sz--;
+#	endif
+
+    	for (j = low_limit; j <= byte_sz; j++) GC_size_map[j] = word_sz;  
+    }
+# endif
+
+
+/*
+ * The following is a gross hack to deal with a problem that can occur
+ * on machines that are sloppy about stack frame sizes, notably SPARC.
+ * Bogus pointers may be written to the stack and not cleared for
+ * a LONG time, because they always fall into holes in stack frames
+ * that are not written.  We partially address this by clearing
+ * sections of the stack whenever we get control.
+ */
+word GC_stack_last_cleared = 0;	/* GC_no when we last did this */
+# ifdef THREADS
+#   define CLEAR_SIZE 2048
+# else
+#   define CLEAR_SIZE 213
+# endif
+# define DEGRADE_RATE 50
+
+word GC_min_sp;		/* Coolest stack pointer value from which we've */
+			/* already cleared the stack.			*/
+			
+# ifdef STACK_GROWS_DOWN
+#   define COOLER_THAN >
+#   define HOTTER_THAN <
+#   define MAKE_COOLER(x,y) if ((word)(x)+(y) > (word)(x)) {(x) += (y);} \
+			    else {(x) = (word)ONES;}
+#   define MAKE_HOTTER(x,y) (x) -= (y)
+# else
+#   define COOLER_THAN <
+#   define HOTTER_THAN >
+#   define MAKE_COOLER(x,y) if ((word)(x)-(y) < (word)(x)) {(x) -= (y);} else {(x) = 0;}
+#   define MAKE_HOTTER(x,y) (x) += (y)
+# endif
+
+word GC_high_water;
+			/* "hottest" stack pointer value we have seen	*/
+			/* recently.  Degrades over time.		*/
+
+word GC_words_allocd_at_reset;
+
+#if defined(ASM_CLEAR_CODE) && !defined(THREADS)
+  extern ptr_t GC_clear_stack_inner();
+#endif  
+
+#if !defined(ASM_CLEAR_CODE) && !defined(THREADS)
+/* Clear the stack up to about limit.  Return arg. */
+/*ARGSUSED*/
+ptr_t GC_clear_stack_inner(arg, limit)
+ptr_t arg;
+word limit;
+{
+    word dummy[CLEAR_SIZE];
+    
+    BZERO(dummy, CLEAR_SIZE*sizeof(word));
+    if ((word)(dummy) COOLER_THAN limit) {
+        (void) GC_clear_stack_inner(arg, limit);
+    }
+    /* Make sure the recursive call is not a tail call, and the bzero	*/
+    /* call is not recognized as dead code.				*/
+    GC_noop1((word)dummy);
+    return(arg);
+}
+#endif
+
+/* Clear some of the inaccessible part of the stack.  Returns its	*/
+/* argument, so it can be used in a tail call position, hence clearing  */
+/* another frame.							*/
+ptr_t GC_clear_stack(arg)
+ptr_t arg;
+{
+    register word sp = (word)GC_approx_sp();  /* Hotter than actual sp */
+#   ifdef THREADS
+        word dummy[CLEAR_SIZE];
+#   else
+    	register word limit;
+#   endif
+    
+#   define SLOP 400
+	/* Extra bytes we clear every time.  This clears our own	*/
+	/* activation record, and should cause more frequent		*/
+	/* clearing near the cold end of the stack, a good thing.	*/
+#   define GC_SLOP 4000
+	/* We make GC_high_water this much hotter than we really saw   	*/
+	/* saw it, to cover for GC noise etc. above our current frame.	*/
+#   define CLEAR_THRESHOLD 100000
+	/* We restart the clearing process after this many bytes of	*/
+	/* allocation.  Otherwise very heavily recursive programs	*/
+	/* with sparse stacks may result in heaps that grow almost	*/
+	/* without bounds.  As the heap gets larger, collection 	*/
+	/* frequency decreases, thus clearing frequency would decrease, */
+	/* thus more junk remains accessible, thus the heap gets	*/
+	/* larger ...							*/
+# ifdef THREADS
+    BZERO(dummy, CLEAR_SIZE*sizeof(word));
+# else
+    if (GC_gc_no > GC_stack_last_cleared) {
+        /* Start things over, so we clear the entire stack again */
+        if (GC_stack_last_cleared == 0) GC_high_water = (word) GC_stackbottom;
+        GC_min_sp = GC_high_water;
+        GC_stack_last_cleared = GC_gc_no;
+        GC_words_allocd_at_reset = GC_words_allocd;
+    }
+    /* Adjust GC_high_water */
+        MAKE_COOLER(GC_high_water, WORDS_TO_BYTES(DEGRADE_RATE) + GC_SLOP);
+        if (sp HOTTER_THAN GC_high_water) {
+            GC_high_water = sp;
+        }
+        MAKE_HOTTER(GC_high_water, GC_SLOP);
+    limit = GC_min_sp;
+    MAKE_HOTTER(limit, SLOP);
+    if (sp COOLER_THAN limit) {
+        limit &= ~0xf;	/* Make it sufficiently aligned for assembly	*/
+        		/* implementations of GC_clear_stack_inner.	*/
+        GC_min_sp = sp;
+        return(GC_clear_stack_inner(arg, limit));
+    } else if (WORDS_TO_BYTES(GC_words_allocd - GC_words_allocd_at_reset)
+    	       > CLEAR_THRESHOLD) {
+    	/* Restart clearing process, but limit how much clearing we do. */
+    	GC_min_sp = sp;
+    	MAKE_HOTTER(GC_min_sp, CLEAR_THRESHOLD/4);
+    	if (GC_min_sp HOTTER_THAN GC_high_water) GC_min_sp = GC_high_water;
+    	GC_words_allocd_at_reset = GC_words_allocd;
+    }  
+# endif
+  return(arg);
+}
+
+
+/* Return a pointer to the base address of p, given a pointer to a	*/
+/* an address within an object.  Return 0 o.w.				*/
+# ifdef __STDC__
+    GC_PTR GC_base(GC_PTR p)
+# else
+    GC_PTR GC_base(p)
+    GC_PTR p;
+# endif
+{
+    register word r;
+    register struct hblk *h;
+    register bottom_index *bi;
+    register hdr *candidate_hdr;
+    register word limit;
+    
+    r = (word)p;
+    if (!GC_is_initialized) return 0;
+    h = HBLKPTR(r);
+    GET_BI(r, bi);
+    candidate_hdr = HDR_FROM_BI(bi, r);
+    if (candidate_hdr == 0) return(0);
+    /* If it's a pointer to the middle of a large object, move it	*/
+    /* to the beginning.						*/
+	while (IS_FORWARDING_ADDR_OR_NIL(candidate_hdr)) {
+	   h = FORWARDED_ADDR(h,candidate_hdr);
+	   r = (word)h + HDR_BYTES;
+	   candidate_hdr = HDR(h);
+	}
+    if (candidate_hdr -> hb_map == GC_invalid_map) return(0);
+    /* Make sure r points to the beginning of the object */
+	r &= ~(WORDS_TO_BYTES(1) - 1);
+        {
+	    register int offset = (char *)r - (char *)(HBLKPTR(r));
+	    register signed_word sz = candidate_hdr -> hb_sz;
+	    
+#	    ifdef ALL_INTERIOR_POINTERS
+	      register map_entry_type map_entry;
+	      
+	      map_entry = MAP_ENTRY((candidate_hdr -> hb_map), offset);
+	      if (map_entry == OBJ_INVALID) {
+            	return(0);
+              }
+              r -= WORDS_TO_BYTES(map_entry);
+              limit = r + WORDS_TO_BYTES(sz);
+#	    else
+	      register int correction;
+	      
+	      offset = BYTES_TO_WORDS(offset - HDR_BYTES);
+	      correction = offset % sz;
+	      r -= (WORDS_TO_BYTES(correction));
+	      limit = r + WORDS_TO_BYTES(sz);
+	      if (limit > (word)(h + 1)
+	        && sz <= BYTES_TO_WORDS(HBLKSIZE) - HDR_WORDS) {
+	        return(0);
+	      }
+#	    endif
+	    if ((word)p >= limit) return(0);
+	}
+    return((GC_PTR)r);
+}
+
+
+/* Return the size of an object, given a pointer to its base.		*/
+/* (For small obects this also happens to work from interior pointers,	*/
+/* but that shouldn't be relied upon.)					*/
+# ifdef __STDC__
+    size_t GC_size(GC_PTR p)
+# else
+    size_t GC_size(p)
+    GC_PTR p;
+# endif
+{
+    register int sz;
+    register hdr * hhdr = HDR(p);
+    
+    sz = WORDS_TO_BYTES(hhdr -> hb_sz);
+    if (sz < 0) {
+        return(-sz);
+    } else {
+        return(sz);
+    }
+}
+
+size_t GC_get_heap_size GC_PROTO(())
+{
+    return ((size_t) GC_heapsize);
+}
+
+size_t GC_get_bytes_since_gc GC_PROTO(())
+{
+    return ((size_t) WORDS_TO_BYTES(GC_words_allocd));
+}
+
+GC_bool GC_is_initialized = FALSE;
+
+void GC_init()
+{
+    DCL_LOCK_STATE;
+    
+    DISABLE_SIGNALS();
+    LOCK();
+    GC_init_inner();
+    UNLOCK();
+    ENABLE_SIGNALS();
+
+}
+
+#ifdef MSWIN32
+    extern void GC_init_win32();
+#endif
+
+extern void GC_setpagesize();
+
+void GC_init_inner()
+{
+#   ifndef THREADS
+        word dummy;
+#   endif
+    
+    if (GC_is_initialized) return;
+    GC_setpagesize();
+    GC_exclude_static_roots(beginGC_arrays, end_gc_area);
+#   ifdef PRINTSTATS
+	if ((ptr_t)endGC_arrays != (ptr_t)(&GC_obj_kinds)) {
+	    GC_printf0("Reordering linker, didn't exclude obj_kinds\n");
+	}
+#   endif
+#   ifdef MSWIN32
+ 	GC_init_win32();
+#   endif
+#   if defined(LINUX) && (defined(POWERPC) || defined(ALPHA) || \
+              defined(SPARC) || defined(MIPS))
+	GC_init_linux_data_start();
+#   endif
+#   ifdef SOLARIS_THREADS
+	GC_thr_init();
+	/* We need dirty bits in order to find live stack sections.	*/
+        GC_dirty_init();
+#   endif
+#   if defined(IRIX_THREADS) || defined(LINUX_THREADS) \
+       || defined(IRIX_JDK_THREADS)
+        GC_thr_init();
+#   endif
+#   if !defined(THREADS) || defined(SOLARIS_THREADS) || defined(WIN32_THREADS) \
+       || defined(IRIX_THREADS) || defined(LINUX_THREADS)
+      if (GC_stackbottom == 0) {
+	GC_stackbottom = GC_get_stack_base();
+      }
+#   endif
+    if  (sizeof (ptr_t) != sizeof(word)) {
+        ABORT("sizeof (ptr_t) != sizeof(word)\n");
+    }
+    if  (sizeof (signed_word) != sizeof(word)) {
+        ABORT("sizeof (signed_word) != sizeof(word)\n");
+    }
+    if  (sizeof (struct hblk) != HBLKSIZE) {
+        ABORT("sizeof (struct hblk) != HBLKSIZE\n");
+    }
+#   ifndef THREADS
+#     if defined(STACK_GROWS_UP) && defined(STACK_GROWS_DOWN)
+  	ABORT(
+  	  "Only one of STACK_GROWS_UP and STACK_GROWS_DOWN should be defd\n");
+#     endif
+#     if !defined(STACK_GROWS_UP) && !defined(STACK_GROWS_DOWN)
+  	ABORT(
+  	  "One of STACK_GROWS_UP and STACK_GROWS_DOWN should be defd\n");
+#     endif
+#     ifdef STACK_GROWS_DOWN
+        if ((word)(&dummy) > (word)GC_stackbottom) {
+          GC_err_printf0(
+          	"STACK_GROWS_DOWN is defd, but stack appears to grow up\n");
+#	  ifndef UTS4  /* Compiler bug workaround */
+            GC_err_printf2("sp = 0x%lx, GC_stackbottom = 0x%lx\n",
+          	   	   (unsigned long) (&dummy),
+          	   	   (unsigned long) GC_stackbottom);
+#	  endif
+          ABORT("stack direction 3\n");
+        }
+#     else
+        if ((word)(&dummy) < (word)GC_stackbottom) {
+          GC_err_printf0(
+          	"STACK_GROWS_UP is defd, but stack appears to grow down\n");
+          GC_err_printf2("sp = 0x%lx, GC_stackbottom = 0x%lx\n",
+          	       	 (unsigned long) (&dummy),
+          	     	 (unsigned long) GC_stackbottom);
+          ABORT("stack direction 4");
+        }
+#     endif
+#   endif
+#   if !defined(_AUX_SOURCE) || defined(__GNUC__)
+      if ((word)(-1) < (word)0) {
+    	GC_err_printf0("The type word should be an unsigned integer type\n");
+    	GC_err_printf0("It appears to be signed\n");
+    	ABORT("word");
+      }
+#   endif
+    if ((signed_word)(-1) >= (signed_word)0) {
+    	GC_err_printf0(
+    		"The type signed_word should be a signed integer type\n");
+    	GC_err_printf0("It appears to be unsigned\n");
+    	ABORT("signed_word");
+    }
+    
+    /* Add initial guess of root sets.  Do this first, since sbrk(0)	*/
+    /* might be used.							*/
+      GC_register_data_segments();
+    GC_init_headers();
+    GC_bl_init();
+    GC_mark_init();
+    if (!GC_expand_hp_inner((word)MINHINCR)) {
+        GC_err_printf0("Can't start up: not enough memory\n");
+        EXIT();
+    }
+    /* Preallocate large object map.  It's otherwise inconvenient to 	*/
+    /* deal with failure.						*/
+      if (!GC_add_map_entry((word)0)) {
+        GC_err_printf0("Can't start up: not enough memory\n");
+        EXIT();
+      }
+    GC_register_displacement_inner(0L);
+#   ifdef MERGE_SIZES
+      GC_init_size_map();
+#   endif
+#   ifdef PCR
+      if (PCR_IL_Lock(PCR_Bool_false, PCR_allSigsBlocked, PCR_waitForever)
+          != PCR_ERes_okay) {
+          ABORT("Can't lock load state\n");
+      } else if (PCR_IL_Unlock() != PCR_ERes_okay) {
+          ABORT("Can't unlock load state\n");
+      }
+      PCR_IL_Unlock();
+      GC_pcr_install();
+#   endif
+    /* Get black list set up */
+      GC_gcollect_inner();
+#   ifdef STUBBORN_ALLOC
+    	GC_stubborn_init();
+#   endif
+    GC_is_initialized = TRUE;
+    /* Convince lint that some things are used */
+#   ifdef LINT
+      {
+          extern char * GC_copyright[];
+          extern int GC_read();
+          extern void GC_register_finalizer_no_order();
+          
+          GC_noop(GC_copyright, GC_find_header,
+                  GC_push_one, GC_call_with_alloc_lock, GC_read,
+                  GC_dont_expand,
+#		  ifndef NO_DEBUGGING
+		    GC_dump,
+#		  endif
+                  GC_register_finalizer_no_order);
+      }
+#   endif
+}
+
+void GC_enable_incremental GC_PROTO(())
+{
+# if !defined(SMALL_CONFIG)
+  if (!GC_find_leak) {
+    DCL_LOCK_STATE;
+    
+    DISABLE_SIGNALS();
+    LOCK();
+    if (GC_incremental) goto out;
+    GC_setpagesize();
+#   ifdef MSWIN32
+      {
+        extern GC_bool GC_is_win32s();
+
+	/* VirtualProtect is not functional under win32s.	*/
+	if (GC_is_win32s()) goto out;
+      }
+#   endif /* MSWIN32 */
+#   ifndef SOLARIS_THREADS
+        GC_dirty_init();
+#   endif
+    if (!GC_is_initialized) {
+        GC_init_inner();
+    }
+    if (GC_dont_gc) {
+        /* Can't easily do it. */
+        UNLOCK();
+    	ENABLE_SIGNALS();
+    	return;
+    }
+    if (GC_words_allocd > 0) {
+    	/* There may be unmarked reachable objects	*/
+    	GC_gcollect_inner();
+    }   /* else we're OK in assuming everything's	*/
+    	/* clean since nothing can point to an	  	*/
+    	/* unmarked object.			  	*/
+    GC_read_dirty();
+    GC_incremental = TRUE;
+out:
+    UNLOCK();
+    ENABLE_SIGNALS();
+  }
+# endif
+}
+
+
+#ifdef MSWIN32
+# define LOG_FILE "gc.log"
+
+  HANDLE GC_stdout = 0, GC_stderr;
+  int GC_tmp;
+  DWORD GC_junk;
+
+  void GC_set_files()
+  {
+    if (!GC_stdout) {
+        GC_stdout = CreateFile(LOG_FILE, GENERIC_WRITE,
+        		       FILE_SHARE_READ | FILE_SHARE_WRITE,
+        		       NULL, CREATE_ALWAYS, FILE_FLAG_WRITE_THROUGH,
+        		       NULL); 
+    	if (INVALID_HANDLE_VALUE == GC_stdout) ABORT("Open of log file failed");
+    }
+    if (GC_stderr == 0) {
+	GC_stderr = GC_stdout;
+    }
+  }
+
+#endif
+
+#if defined(OS2) || defined(MACOS)
+FILE * GC_stdout = NULL;
+FILE * GC_stderr = NULL;
+int GC_tmp;  /* Should really be local ... */
+
+  void GC_set_files()
+  {
+      if (GC_stdout == NULL) {
+	GC_stdout = stdout;
+    }
+    if (GC_stderr == NULL) {
+	GC_stderr = stderr;
+    }
+  }
+#endif
+
+#if !defined(OS2) && !defined(MACOS) && !defined(MSWIN32)
+  int GC_stdout = 1;
+  int GC_stderr = 2;
+# if !defined(AMIGA)
+#   include <unistd.h>
+# endif
+#endif
+
+#if !defined(MSWIN32)  && !defined(OS2) && !defined(MACOS)
+int GC_write(fd, buf, len)
+int fd;
+char *buf;
+size_t len;
+{
+     register int bytes_written = 0;
+     register int result;
+     
+     while (bytes_written < len) {
+#	ifdef SOLARIS_THREADS
+	    result = syscall(SYS_write, fd, buf + bytes_written,
+	    			  	    len - bytes_written);
+#	else
+     	    result = write(fd, buf + bytes_written, len - bytes_written);
+#	endif
+	if (-1 == result) return(result);
+	bytes_written += result;
+    }
+    return(bytes_written);
+}
+#endif /* UN*X */
+
+#ifdef MSWIN32
+#   define WRITE(f, buf, len) (GC_set_files(), \
+			       GC_tmp = WriteFile((f), (buf), \
+			       			  (len), &GC_junk, NULL),\
+			       (GC_tmp? 1 : -1))
+#else
+#   if defined(OS2) || defined(MACOS)
+#   define WRITE(f, buf, len) (GC_set_files(), \
+			       GC_tmp = fwrite((buf), 1, (len), (f)), \
+			       fflush(f), GC_tmp)
+#   else
+#     define WRITE(f, buf, len) GC_write((f), (buf), (len))
+#   endif
+#endif
+
+/* A version of printf that is unlikely to call malloc, and is thus safer */
+/* to call from the collector in case malloc has been bound to GC_malloc. */
+/* Assumes that no more than 1023 characters are written at once.	  */
+/* Assumes that all arguments have been converted to something of the	  */
+/* same size as long, and that the format conversions expect something	  */
+/* of that size.							  */
+void GC_printf(format, a, b, c, d, e, f)
+char * format;
+long a, b, c, d, e, f;
+{
+    char buf[1025];
+    
+    if (GC_quiet) return;
+    buf[1024] = 0x15;
+    (void) sprintf(buf, format, a, b, c, d, e, f);
+    if (buf[1024] != 0x15) ABORT("GC_printf clobbered stack");
+    if (WRITE(GC_stdout, buf, strlen(buf)) < 0) ABORT("write to stdout failed");
+}
+
+void GC_err_printf(format, a, b, c, d, e, f)
+char * format;
+long a, b, c, d, e, f;
+{
+    char buf[1025];
+    
+    buf[1024] = 0x15;
+    (void) sprintf(buf, format, a, b, c, d, e, f);
+    if (buf[1024] != 0x15) ABORT("GC_err_printf clobbered stack");
+    if (WRITE(GC_stderr, buf, strlen(buf)) < 0) ABORT("write to stderr failed");
+}
+
+void GC_err_puts(s)
+char *s;
+{
+    if (WRITE(GC_stderr, s, strlen(s)) < 0) ABORT("write to stderr failed");
+}
+
+# if defined(__STDC__) || defined(__cplusplus)
+    void GC_default_warn_proc(char *msg, GC_word arg)
+# else
+    void GC_default_warn_proc(msg, arg)
+    char *msg;
+    GC_word arg;
+# endif
+{
+    GC_err_printf1(msg, (unsigned long)arg);
+}
+
+GC_warn_proc GC_current_warn_proc = GC_default_warn_proc;
+
+# if defined(__STDC__) || defined(__cplusplus)
+    GC_warn_proc GC_set_warn_proc(GC_warn_proc p)
+# else
+    GC_warn_proc GC_set_warn_proc(p)
+    GC_warn_proc p;
+# endif
+{
+    GC_warn_proc result;
+
+    LOCK();
+    result = GC_current_warn_proc;
+    GC_current_warn_proc = p;
+    UNLOCK();
+    return(result);
+}
+
+
+#ifndef PCR
+void GC_abort(msg)
+char * msg;
+{
+    GC_err_printf1("%s\n", msg);
+    (void) abort();
+}
+#endif
+
+#ifdef NEED_CALLINFO
+
+void GC_print_callers (info)
+struct callinfo info[NFRAMES];
+{
+    register int i;
+    
+#   if NFRAMES == 1
+      GC_err_printf0("\tCaller at allocation:\n");
+#   else
+      GC_err_printf0("\tCall chain at allocation:\n");
+#   endif
+    for (i = 0; i < NFRAMES; i++) {
+     	if (info[i].ci_pc == 0) break;
+#	if NARGS > 0
+	{
+	  int j;
+
+     	  GC_err_printf0("\t\targs: ");
+     	  for (j = 0; j < NARGS; j++) {
+     	    if (j != 0) GC_err_printf0(", ");
+     	    GC_err_printf2("%d (0x%X)", ~(info[i].ci_arg[j]),
+     	    				~(info[i].ci_arg[j]));
+     	  }
+	  GC_err_printf0("\n");
+	}
+# 	endif
+     	GC_err_printf1("\t\t##PC##= 0x%X\n", info[i].ci_pc);
+    }
+}
+
+#endif /* SAVE_CALL_CHAIN */
+
+# ifdef SRC_M3
+void GC_enable()
+{
+    GC_dont_gc--;
+}
+
+void GC_disable()
+{
+    GC_dont_gc++;
+}
+# endif
+
+#if !defined(NO_DEBUGGING)
+
+void GC_dump()
+{
+    GC_printf0("***Static roots:\n");
+    GC_print_static_roots();
+    GC_printf0("\n***Heap sections:\n");
+    GC_print_heap_sects();
+    GC_printf0("\n***Free blocks:\n");
+    GC_print_hblkfreelist();
+    GC_printf0("\n***Blocks in use:\n");
+    GC_print_block_list();
+}
+
+# endif /* NO_DEBUGGING */