Imported from ../bash-2.05a.tar.gz.

1 files changed, 103 insertions, 0 deletions

diff --git a/lib/malloc/table.h b/lib/malloc/table.h
new file mode 100644
index 0000000..f39beb8
--- /dev/null
+++ b/lib/malloc/table.h
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+/* table.h - definitions for tables for keeping track of allocated memory */
+
+/*  Copyright (C) 2001 Free Software Foundation, Inc.
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2, or (at your option)
+    any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
+
+#ifndef _MTABLE_H
+#define _MTABLE_H
+
+#include "imalloc.h"
+
+#ifdef MALLOC_REGISTER
+
+/* values for flags byte. */
+#define MT_ALLOC	0x01
+#define MT_FREE		0x02
+
+/*
+ * Memory table entry.
+ *
+ * MEM is the address of the allocated pointer.
+ * SIZE is the requested allocation size.
+ * FLAGS includes either MT_ALLOC (MEM is allocated) or MT_FREE (MEM is
+ * not allocated).  Other flags later.
+ * FUNC is set to the name of the function doing the allocation (from the
+ * `tag' argument to register_alloc().
+ * FILE and LINE are the filename and line number of the last allocation
+ * and free (depending on STATUS) of MEM.
+ * NALLOC and NFREE are incremented on each allocation that returns MEM or
+ * each free of MEM, respectively (way to keep track of memory reuse
+ * and how well the free lists are working).
+ *
+ */
+typedef struct mr_table {
+	PTR_T mem;
+	size_t size;
+	char flags;
+	const char *func;
+	const char *file;
+	int line;
+	int nalloc, nfree;
+} mr_table_t;
+
+#define REG_TABLE_SIZE	8192
+
+extern mr_table_t *mr_table_entry ();
+extern void mregister_alloc ();
+extern void mregister_free ();
+extern void mregister_describe_mem ();
+extern void mregister_dump_table ();
+extern void mregister_table_init ();
+
+/* NOTE:  HASH_MIX taken from dmalloc (http://dmalloc.com) */
+
+/*
+ * void HASH_MIX
+ *
+ * DESCRIPTION:
+ *
+ * Mix 3 32-bit values reversibly.  For every delta with one or two
+ * bits set, and the deltas of all three high bits or all three low
+ * bits, whether the original value of a,b,c is almost all zero or is
+ * uniformly distributed.
+ *
+ * If HASH_MIX() is run forward or backward, at least 32 bits in a,b,c
+ * have at least 1/4 probability of changing.  If mix() is run
+ * forward, every bit of c will change between 1/3 and 2/3 of the
+ * time.  (Well, 22/100 and 78/100 for some 2-bit deltas.)
+ *
+ * HASH_MIX() takes 36 machine instructions, but only 18 cycles on a
+ * superscalar machine (like a Pentium or a Sparc).  No faster mixer
+ * seems to work, that's the result of my brute-force search.  There
+ * were about 2^68 hashes to choose from.  I only tested about a
+ * billion of those.
+ */
+#define HASH_MIX(a, b, c) \
+ do { \
+   a -= b; a -= c; a ^= (c >> 13); \
+   b -= c; b -= a; b ^= (a << 8); \
+   c -= a; c -= b; c ^= (b >> 13); \
+   a -= b; a -= c; a ^= (c >> 12); \
+   b -= c; b -= a; b ^= (a << 16); \
+   c -= a; c -= b; c ^= (b >> 5); \
+   a -= b; a -= c; a ^= (c >> 3); \
+   b -= c; b -= a; b ^= (a << 10); \
+   c -= a; c -= b; c ^= (b >> 15); \
+ } while(0)
+
+#endif /* MALLOC_REGISTER */
+
+#endif /* _MTABLE_H */