From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001
From: upstream source tree <ports@midipix.org>
Date: Sun, 15 Mar 2015 20:14:05 -0400
Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified
 gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream
 tarball.

downloading a git-generated archive based on the 'upstream' tag
should provide you with a source tree that is binary identical
to the one extracted from the above tarball.

if you have obtained the source via the command 'git clone',
however, do note that line-endings of files in your working
directory might differ from line-endings of the respective
files in the upstream repository.
---
 boehm-gc/obj_map.c | 147 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 147 insertions(+)
 create mode 100644 boehm-gc/obj_map.c

(limited to 'boehm-gc/obj_map.c')

diff --git a/boehm-gc/obj_map.c b/boehm-gc/obj_map.c
new file mode 100644
index 000000000..d002d65b4
--- /dev/null
+++ b/boehm-gc/obj_map.c
@@ -0,0 +1,147 @@
+/* 
+ * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
+ * Copyright (c) 1991, 1992 by Xerox Corporation.  All rights reserved.
+ * Copyright (c) 1999-2001 by Hewlett-Packard Company. 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.
+ */
+  
+/* Routines for maintaining maps describing heap block
+ * layouts for various object sizes.  Allows fast pointer validity checks
+ * and fast location of object start locations on machines (such as SPARC)
+ * with slow division.
+ */
+ 
+# include "private/gc_priv.h"
+
+map_entry_type * GC_invalid_map = 0;
+
+/* Invalidate the object map associated with a block.	Free blocks	*/
+/* are identified by invalid maps.					*/
+void GC_invalidate_map(hhdr)
+hdr *hhdr;
+{
+    register int displ;
+    
+    if (GC_invalid_map == 0) {
+        GC_invalid_map = (map_entry_type *)GC_scratch_alloc(MAP_SIZE);
+        if (GC_invalid_map == 0) {
+            GC_err_printf0(
+            	"Cant initialize GC_invalid_map: insufficient memory\n");
+            EXIT();
+        }
+        for (displ = 0; displ < HBLKSIZE; displ++) {
+            MAP_ENTRY(GC_invalid_map, displ) = OBJ_INVALID;
+        }
+    }
+    hhdr -> hb_map = GC_invalid_map;
+}
+
+/* Consider pointers that are offset bytes displaced from the beginning */
+/* of an object to be valid.                                            */
+
+# if defined(__STDC__) || defined(__cplusplus)
+    void GC_register_displacement(GC_word offset)
+# else
+    void GC_register_displacement(offset) 
+    GC_word offset;
+# endif
+{
+    DCL_LOCK_STATE;
+    
+    DISABLE_SIGNALS();
+    LOCK();
+    GC_register_displacement_inner(offset);
+    UNLOCK();
+    ENABLE_SIGNALS();
+}
+
+void GC_register_displacement_inner(offset) 
+word offset;
+{
+    register unsigned i;
+    word map_entry = BYTES_TO_WORDS(offset);
+    
+    if (offset >= VALID_OFFSET_SZ) {
+        ABORT("Bad argument to GC_register_displacement");
+    }
+    if (map_entry > MAX_OFFSET) map_entry = OFFSET_TOO_BIG;
+    if (!GC_valid_offsets[offset]) {
+      GC_valid_offsets[offset] = TRUE;
+      GC_modws_valid_offsets[offset % sizeof(word)] = TRUE;
+      if (!GC_all_interior_pointers) {
+        for (i = 0; i <= MAXOBJSZ; i++) {
+          if (GC_obj_map[i] != 0) {
+             if (i == 0) {
+               GC_obj_map[i][offset] = (map_entry_type)map_entry;
+             } else {
+               register unsigned j;
+               register unsigned lb = WORDS_TO_BYTES(i);
+               
+               if (offset < lb) {
+                 for (j = offset; j < HBLKSIZE; j += lb) {
+                   GC_obj_map[i][j] = (map_entry_type)map_entry;
+                 }
+               }
+             }
+          }
+	}
+      }
+    }
+}
+
+
+/* Add a heap block map for objects of size sz to obj_map.	*/
+/* Return FALSE on failure.					*/
+GC_bool GC_add_map_entry(sz)
+word sz;
+{
+    register unsigned obj_start;
+    register unsigned displ;
+    register map_entry_type * new_map;
+    word map_entry;
+    
+    if (sz > MAXOBJSZ) sz = 0;
+    if (GC_obj_map[sz] != 0) {
+        return(TRUE);
+    }
+    new_map = (map_entry_type *)GC_scratch_alloc(MAP_SIZE);
+    if (new_map == 0) return(FALSE);
+#   ifdef PRINTSTATS
+        GC_printf1("Adding block map for size %lu\n", (unsigned long)sz);
+#   endif
+    for (displ = 0; displ < HBLKSIZE; displ++) {
+        MAP_ENTRY(new_map,displ) = OBJ_INVALID;
+    }
+    if (sz == 0) {
+        for(displ = 0; displ <= HBLKSIZE; displ++) {
+            if (OFFSET_VALID(displ)) {
+		map_entry = BYTES_TO_WORDS(displ);
+		if (map_entry > MAX_OFFSET) map_entry = OFFSET_TOO_BIG;
+                MAP_ENTRY(new_map,displ) = (map_entry_type)map_entry;
+            }
+        }
+    } else {
+        for (obj_start = 0;
+             obj_start + WORDS_TO_BYTES(sz) <= HBLKSIZE;
+             obj_start += WORDS_TO_BYTES(sz)) {
+             for (displ = 0; displ < WORDS_TO_BYTES(sz); displ++) {
+                 if (OFFSET_VALID(displ)) {
+		     map_entry = BYTES_TO_WORDS(displ);
+		     if (map_entry > MAX_OFFSET) map_entry = OFFSET_TOO_BIG;
+                     MAP_ENTRY(new_map, obj_start + displ) =
+						(map_entry_type)map_entry;
+                 }
+             }
+        }
+    }
+    GC_obj_map[sz] = new_map;
+    return(TRUE);
+}
-- 
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