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-rw-r--r--gc/new_hblk.c128
1 files changed, 73 insertions, 55 deletions
diff --git a/gc/new_hblk.c b/gc/new_hblk.c
index 9f32ae0..d904aed 100644
--- a/gc/new_hblk.c
+++ b/gc/new_hblk.c
@@ -1,6 +1,7 @@
/*
* Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
* Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
+ * Copyright (c) 2000 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.
@@ -19,7 +20,7 @@
# include <stdio.h>
-# include "gc_priv.h"
+# include "private/gc_priv.h"
#ifndef SMALL_CONFIG
/*
@@ -30,7 +31,7 @@ ptr_t GC_build_fl1(h, ofl)
struct hblk *h;
ptr_t ofl;
{
- register word * p = (word *)h;
+ register word * p = h -> hb_body;
register word * lim = (word *)(h + 1);
p[0] = (word)ofl;
@@ -52,7 +53,7 @@ ptr_t GC_build_fl_clear2(h, ofl)
struct hblk *h;
ptr_t ofl;
{
- register word * p = (word *)h;
+ register word * p = h -> hb_body;
register word * lim = (word *)(h + 1);
p[0] = (word)ofl;
@@ -74,7 +75,7 @@ ptr_t GC_build_fl_clear3(h, ofl)
struct hblk *h;
ptr_t ofl;
{
- register word * p = (word *)h;
+ register word * p = h -> hb_body;
register word * lim = (word *)(h + 1) - 2;
p[0] = (word)ofl;
@@ -94,7 +95,7 @@ ptr_t GC_build_fl_clear4(h, ofl)
struct hblk *h;
ptr_t ofl;
{
- register word * p = (word *)h;
+ register word * p = h -> hb_body;
register word * lim = (word *)(h + 1);
p[0] = (word)ofl;
@@ -103,10 +104,10 @@ ptr_t ofl;
p[3] = 0;
p += 4;
for (; p < lim; p += 4) {
+ PREFETCH_FOR_WRITE(p+64);
p[0] = (word)(p-4);
p[1] = 0;
- p[2] = 0;
- p[3] = 0;
+ CLEAR_DOUBLE(p+2);
};
return((ptr_t)(p-4));
}
@@ -116,7 +117,7 @@ ptr_t GC_build_fl2(h, ofl)
struct hblk *h;
ptr_t ofl;
{
- register word * p = (word *)h;
+ register word * p = h -> hb_body;
register word * lim = (word *)(h + 1);
p[0] = (word)ofl;
@@ -134,13 +135,14 @@ ptr_t GC_build_fl4(h, ofl)
struct hblk *h;
ptr_t ofl;
{
- register word * p = (word *)h;
+ register word * p = h -> hb_body;
register word * lim = (word *)(h + 1);
p[0] = (word)ofl;
p[4] = (word)p;
p += 8;
for (; p < lim; p += 8) {
+ PREFETCH_FOR_WRITE(p+64);
p[0] = (word)(p-4);
p[4] = (word)p;
};
@@ -149,67 +151,51 @@ ptr_t ofl;
#endif /* !SMALL_CONFIG */
-/*
- * Allocate a new heapblock for small objects of size n.
- * Add all of the heapblock's objects to the free list for objects
- * of that size.
- * Set all mark bits if objects are uncollectable.
- * Will fail to do anything if we are out of memory.
- */
-void GC_new_hblk(sz, kind)
-register word sz;
-int kind;
-{
- register word *p,
- *prev;
- word *last_object; /* points to last object in new hblk */
- register struct hblk *h; /* the new heap block */
- register GC_bool clear = GC_obj_kinds[kind].ok_init;
-# ifdef PRINTSTATS
- if ((sizeof (struct hblk)) > HBLKSIZE) {
- ABORT("HBLK SZ inconsistency");
- }
-# endif
-
- /* Allocate a new heap block */
- h = GC_allochblk(sz, kind, 0);
- if (h == 0) return;
-
- /* Mark all objects if appropriate. */
- if (IS_UNCOLLECTABLE(kind)) GC_set_hdr_marks(HDR(h));
+/* Build a free list for objects of size sz inside heap block h. */
+/* Clear objects inside h if clear is set. Add list to the end of */
+/* the free list we build. Return the new free list. */
+/* This could be called without the main GC lock, if we ensure that */
+/* there is no concurrent collection which might reclaim objects that */
+/* we have not yet allocated. */
+ptr_t GC_build_fl(h, sz, clear, list)
+struct hblk *h;
+word sz;
+GC_bool clear;
+ptr_t list;
+{
+ word *p, *prev;
+ word *last_object; /* points to last object in new hblk */
+ /* Do a few prefetches here, just because its cheap. */
+ /* If we were more serious about it, these should go inside */
+ /* the loops. But write prefetches usually don't seem to */
+ /* matter much. */
+ PREFETCH_FOR_WRITE((char *)h);
+ PREFETCH_FOR_WRITE((char *)h + 128);
+ PREFETCH_FOR_WRITE((char *)h + 256);
+ PREFETCH_FOR_WRITE((char *)h + 378);
/* Handle small objects sizes more efficiently. For larger objects */
/* the difference is less significant. */
# ifndef SMALL_CONFIG
switch (sz) {
- case 1: GC_obj_kinds[kind].ok_freelist[1] =
- GC_build_fl1(h, GC_obj_kinds[kind].ok_freelist[1]);
- return;
+ case 1: return GC_build_fl1(h, list);
case 2: if (clear) {
- GC_obj_kinds[kind].ok_freelist[2] =
- GC_build_fl_clear2(h, GC_obj_kinds[kind].ok_freelist[2]);
+ return GC_build_fl_clear2(h, list);
} else {
- GC_obj_kinds[kind].ok_freelist[2] =
- GC_build_fl2(h, GC_obj_kinds[kind].ok_freelist[2]);
+ return GC_build_fl2(h, list);
}
- return;
case 3: if (clear) {
- GC_obj_kinds[kind].ok_freelist[3] =
- GC_build_fl_clear3(h, GC_obj_kinds[kind].ok_freelist[3]);
- return;
+ return GC_build_fl_clear3(h, list);
} else {
/* It's messy to do better than the default here. */
break;
}
case 4: if (clear) {
- GC_obj_kinds[kind].ok_freelist[4] =
- GC_build_fl_clear4(h, GC_obj_kinds[kind].ok_freelist[4]);
+ return GC_build_fl_clear4(h, list);
} else {
- GC_obj_kinds[kind].ok_freelist[4] =
- GC_build_fl4(h, GC_obj_kinds[kind].ok_freelist[4]);
+ return GC_build_fl4(h, list);
}
- return;
default:
break;
}
@@ -238,7 +224,39 @@ int kind;
* put p (which is now head of list of objects in *h) as first
* pointer in the appropriate free list for this size.
*/
- obj_link(h -> hb_body) = GC_obj_kinds[kind].ok_freelist[sz];
- GC_obj_kinds[kind].ok_freelist[sz] = ((ptr_t)p);
+ obj_link(h -> hb_body) = list;
+ return ((ptr_t)p);
+}
+
+/*
+ * Allocate a new heapblock for small objects of size n.
+ * Add all of the heapblock's objects to the free list for objects
+ * of that size.
+ * Set all mark bits if objects are uncollectable.
+ * Will fail to do anything if we are out of memory.
+ */
+void GC_new_hblk(sz, kind)
+register word sz;
+int kind;
+{
+ register struct hblk *h; /* the new heap block */
+ register GC_bool clear = GC_obj_kinds[kind].ok_init;
+
+# ifdef PRINTSTATS
+ if ((sizeof (struct hblk)) > HBLKSIZE) {
+ ABORT("HBLK SZ inconsistency");
+ }
+# endif
+
+ /* Allocate a new heap block */
+ h = GC_allochblk(sz, kind, 0);
+ if (h == 0) return;
+
+ /* Mark all objects if appropriate. */
+ if (IS_UNCOLLECTABLE(kind)) GC_set_hdr_marks(HDR(h));
+
+ /* Build the free list */
+ GC_obj_kinds[kind].ok_freelist[sz] =
+ GC_build_fl(h, sz, clear, GC_obj_kinds[kind].ok_freelist[sz]);
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-23 12:00:02 +0000