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diff --git a/lib/malloc/mstats.h b/lib/malloc/mstats.h
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+++ b/lib/malloc/mstats.h
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+/* mstats.h - definitions for malloc statistics */
+
+/*  Copyright (C) 2001-2021 Free Software Foundation, Inc.
+
+    This file is part of GNU Bash, the Bourne-Again SHell.
+
+   Bash 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 3 of the License, or
+   (at your option) any later version.
+
+   Bash 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 Bash.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef _MSTATS_H
+#define _MSTATS_H
+
+#include "imalloc.h"
+
+#ifdef MALLOC_STATS
+
+/* This needs to change if the definition in malloc.c changes */
+#ifndef NBUCKETS
+#  define NBUCKETS 28
+#endif
+
+/*
+ * NMALLOC[i] is the difference between the number of mallocs and frees
+ * for a given block size.  TMALLOC[i] is the total number of mallocs for
+ * a given block size.  NMORECORE[i] is the total number of calls to
+ * morecore(i).  NLESSCORE[i] is the total number of calls to lesscore(i).
+ *
+ * NMAL and NFRE are counts of the number of calls to malloc() and free(),
+ * respectively.  NREALLOC is the total number of calls to realloc();
+ * NRCOPY is the number of times realloc() had to allocate new memory and
+ * copy to it.  NRECURSE is a count of the number of recursive calls to
+ * malloc() for the same bucket size, which can be caused by calls to
+ * malloc() from a signal handler.
+ *
+ * NSBRK is the number of calls to sbrk() (whether by morecore() or for
+ * alignment); TSBRK is the total number of bytes requested from the kernel
+ * with sbrk().
+ *
+ * BYTESUSED is the total number of bytes consumed by blocks currently in
+ * use; BYTESFREE is the total number of bytes currently on all of the free
+ * lists.  BYTESREQ is the total number of bytes requested by the caller
+ * via calls to malloc() and realloc().
+ *
+ * TBSPLIT is the number of times a larger block was split to satisfy a
+ * smaller request. NSPLIT[i] is the number of times a block of size I was
+ * split.
+ *
+ * TBCOALESCE is the number of times two adjacent smaller blocks off the free
+ * list were combined to satisfy a larger request.
+ */
+struct _malstats {
+  int nmalloc[NBUCKETS];
+  int tmalloc[NBUCKETS];
+  int nmorecore[NBUCKETS];
+  int nlesscore[NBUCKETS];
+  int nmal;
+  int nfre;
+  int nrealloc;
+  int nrcopy;
+  int nrecurse;
+  int nsbrk;
+  bits32_t tsbrk;
+  bits32_t bytesused;
+  bits32_t bytesfree;
+  u_bits32_t bytesreq;
+  int tbsplit;
+  int nsplit[NBUCKETS];
+  int tbcoalesce;
+  int ncoalesce[NBUCKETS];
+  int nmmap;
+  bits32_t tmmap;
+};
+
+/* Return statistics describing allocation of blocks of size BLOCKSIZE.
+   NFREE is the number of free blocks for this allocation size.  NUSED
+   is the number of blocks in use.  NMAL is the number of requests for
+   blocks of size BLOCKSIZE.  NMORECORE is the number of times we had
+   to call MORECORE to repopulate the free list for this bucket.
+   NLESSCORE is the number of times we gave memory back to the system
+   from this bucket.  NSPLIT is the number of times a block of this size
+   was split to satisfy a smaller request.  NCOALESCE is the number of
+   times two blocks of this size were combined to satisfy a larger
+   request. */
+struct bucket_stats {
+  u_bits32_t blocksize;
+  int nfree;
+  int nused;
+  int nmal;
+  int nmorecore;
+  int nlesscore;
+  int nsplit;
+  int ncoalesce;
+  int nmmap;		/* currently unused */
+};
+
+extern struct bucket_stats malloc_bucket_stats PARAMS((int));
+extern struct _malstats malloc_stats PARAMS((void));
+extern void print_malloc_stats PARAMS((char *));
+extern void trace_malloc_stats PARAMS((char *, char *));
+
+#endif /* MALLOC_STATS */
+
+#endif /* _MSTATS_H */