Initial creation of sourceware repositorygdb-4_18-branchpoint

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diff --git a/mmalloc/mmprivate.h b/mmalloc/mmprivate.h
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+/* Declarations for `mmalloc' and friends.
+   Copyright 1990, 1991, 1992 Free Software Foundation
+
+   Written May 1989 by Mike Haertel.
+   Heavily modified Mar 1992 by Fred Fish. (fnf@cygnus.com)
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.
+
+   The author may be reached (Email) at the address mike@ai.mit.edu,
+   or (US mail) as Mike Haertel c/o Free Software Foundation. */
+
+
+#ifndef __MMPRIVATE_H
+#define __MMPRIVATE_H 1
+
+#include "mmalloc.h"
+
+#ifdef HAVE_LIMITS_H
+#  include <limits.h>
+#else
+#  ifndef CHAR_BIT
+#    define CHAR_BIT 8
+#  endif
+#endif
+
+#ifndef MIN
+#  define MIN(A, B) ((A) < (B) ? (A) : (B))
+#endif
+
+#define MMALLOC_MAGIC		"mmalloc"	/* Mapped file magic number */
+#define MMALLOC_MAGIC_SIZE	8		/* Size of magic number buf */
+#define MMALLOC_VERSION		1		/* Current mmalloc version */
+#define MMALLOC_KEYS		16		/* Keys for application use */
+
+/* The allocator divides the heap into blocks of fixed size; large
+   requests receive one or more whole blocks, and small requests
+   receive a fragment of a block.  Fragment sizes are powers of two,
+   and all fragments of a block are the same size.  When all the
+   fragments in a block have been freed, the block itself is freed.  */
+
+#define INT_BIT		(CHAR_BIT * sizeof(int))
+#define BLOCKLOG	(INT_BIT > 16 ? 12 : 9)
+#define BLOCKSIZE	((unsigned int) 1 << BLOCKLOG)
+#define BLOCKIFY(SIZE)	(((SIZE) + BLOCKSIZE - 1) / BLOCKSIZE)
+
+/* The difference between two pointers is a signed int.  On machines where
+   the data addresses have the high bit set, we need to ensure that the
+   difference becomes an unsigned int when we are using the address as an
+   integral value.  In addition, when using with the '%' operator, the
+   sign of the result is machine dependent for negative values, so force
+   it to be treated as an unsigned int. */
+
+#define ADDR2UINT(addr)	((unsigned int) ((char *) (addr) - (char *) NULL))
+#define RESIDUAL(addr,bsize) ((unsigned int) (ADDR2UINT (addr) % (bsize)))
+
+/* Determine the amount of memory spanned by the initial heap table
+   (not an absolute limit).  */
+
+#define HEAP		(INT_BIT > 16 ? 4194304 : 65536)
+
+/* Number of contiguous free blocks allowed to build up at the end of
+   memory before they will be returned to the system.  */
+
+#define FINAL_FREE_BLOCKS	8
+
+/* Where to start searching the free list when looking for new memory.
+   The two possible values are 0 and heapindex.  Starting at 0 seems
+   to reduce total memory usage, while starting at heapindex seems to
+   run faster.  */
+
+#define MALLOC_SEARCH_START	mdp -> heapindex
+
+/* Address to block number and vice versa.  */
+
+#define BLOCK(A) (((char *) (A) - mdp -> heapbase) / BLOCKSIZE + 1)
+
+#define ADDRESS(B) ((PTR) (((B) - 1) * BLOCKSIZE + mdp -> heapbase))
+
+/* Data structure giving per-block information.  */
+
+typedef union
+  {
+    /* Heap information for a busy block.  */
+    struct
+      {
+	/* Zero for a large block, or positive giving the
+	   logarithm to the base two of the fragment size.  */
+	int type;
+	union
+	  {
+	    struct
+	      {
+		size_t nfree;	/* Free fragments in a fragmented block.  */
+		size_t first;	/* First free fragment of the block.  */
+	      } frag;
+	    /* Size (in blocks) of a large cluster.  */
+	    size_t size;
+	  } info;
+      } busy;
+    /* Heap information for a free block (that may be the first of
+       a free cluster).  */
+    struct
+      {
+	size_t size;		/* Size (in blocks) of a free cluster.  */
+	size_t next;		/* Index of next free cluster.  */
+	size_t prev;		/* Index of previous free cluster.  */
+      } free;
+  } malloc_info;
+
+/* List of blocks allocated with `mmemalign' (or `mvalloc').  */
+
+struct alignlist
+  {
+    struct alignlist *next;
+    PTR aligned;		/* The address that mmemaligned returned.  */
+    PTR exact;			/* The address that malloc returned.  */
+  };
+
+/* Doubly linked lists of free fragments.  */
+
+struct list
+  {
+    struct list *next;
+    struct list *prev;
+  };
+
+/* Statistics available to the user.
+   FIXME:  By design, the internals of the malloc package are no longer
+   exported to the user via an include file, so access to this data needs
+   to be via some other mechanism, such as mmstat_<something> where the
+   return value is the <something> the user is interested in. */
+
+struct mstats
+  {
+    size_t bytes_total;		/* Total size of the heap. */
+    size_t chunks_used;		/* Chunks allocated by the user. */
+    size_t bytes_used;		/* Byte total of user-allocated chunks. */
+    size_t chunks_free;		/* Chunks in the free list. */
+    size_t bytes_free;		/* Byte total of chunks in the free list. */
+  };
+
+/* Internal structure that defines the format of the malloc-descriptor.
+   This gets written to the base address of the region that mmalloc is
+   managing, and thus also becomes the file header for the mapped file,
+   if such a file exists. */
+
+struct mdesc
+{
+  /* The "magic number" for an mmalloc file. */
+
+  char magic[MMALLOC_MAGIC_SIZE];
+
+  /* The size in bytes of this structure, used as a sanity check when reusing
+     a previously created mapped file. */
+
+  unsigned int headersize;
+
+  /* The version number of the mmalloc package that created this file. */
+
+  unsigned char version;
+
+  /* Some flag bits to keep track of various internal things. */
+
+  unsigned int flags;
+
+  /* If a system call made by the mmalloc package fails, the errno is
+     preserved for future examination. */
+
+  int saved_errno;
+
+  /* Pointer to the function that is used to get more core, or return core
+     to the system, for requests using this malloc descriptor.  For memory
+     mapped regions, this is the mmap() based routine.  There may also be
+     a single malloc descriptor that points to an sbrk() based routine
+     for systems without mmap() or for applications that call the mmalloc()
+     package with a NULL malloc descriptor.
+
+     FIXME:  For mapped regions shared by more than one process, this
+     needs to be maintained on a per-process basis. */
+
+  PTR (*morecore) PARAMS ((struct mdesc *, int));
+     
+  /* Pointer to the function that causes an abort when the memory checking
+     features are activated.  By default this is set to abort(), but can
+     be set to another function by the application using mmalloc().
+
+     FIXME:  For mapped regions shared by more than one process, this
+     needs to be maintained on a per-process basis. */
+
+  void (*abortfunc) PARAMS ((void));
+
+  /* Debugging hook for free.
+
+     FIXME:  For mapped regions shared by more than one process, this
+     needs to be maintained on a per-process basis. */
+
+  void (*mfree_hook) PARAMS ((PTR, PTR));
+
+  /* Debugging hook for `malloc'.
+
+     FIXME:  For mapped regions shared by more than one process, this
+     needs to be maintained on a per-process basis. */
+
+  PTR (*mmalloc_hook) PARAMS ((PTR, size_t));
+
+  /* Debugging hook for realloc.
+
+     FIXME:  For mapped regions shared by more than one process, this
+     needs to be maintained on a per-process basis. */
+
+  PTR (*mrealloc_hook) PARAMS ((PTR, PTR, size_t));
+
+  /* Number of info entries.  */
+
+  size_t heapsize;
+
+  /* Pointer to first block of the heap (base of the first block).  */
+
+  char *heapbase;
+
+  /* Current search index for the heap table.  */
+  /* Search index in the info table.  */
+
+  size_t heapindex;
+
+  /* Limit of valid info table indices.  */
+
+  size_t heaplimit;
+
+  /* Block information table.
+     Allocated with malign/__mmalloc_free (not mmalloc/mfree).  */
+  /* Table indexed by block number giving per-block information.  */
+
+  malloc_info *heapinfo;
+
+  /* Instrumentation.  */
+
+  struct mstats heapstats;
+
+  /* Free list headers for each fragment size.  */
+  /* Free lists for each fragment size.  */
+
+  struct list fraghead[BLOCKLOG];
+
+  /* List of blocks allocated by memalign.  */
+
+  struct alignlist *aligned_blocks;
+
+  /* The base address of the memory region for this malloc heap.  This
+     is the location where the bookkeeping data for mmap and for malloc
+     begins. */
+
+  char *base;
+
+  /* The current location in the memory region for this malloc heap which
+     represents the end of memory in use. */
+
+  char *breakval;
+
+  /* The end of the current memory region for this malloc heap.  This is
+     the first location past the end of mapped memory. */
+
+  char *top;
+
+  /* Open file descriptor for the file to which this malloc heap is mapped.
+     This will always be a valid file descriptor, since /dev/zero is used
+     by default if no open file is supplied by the client.  Also note that
+     it may change each time the region is mapped and unmapped. */
+
+  int fd;
+
+  /* An array of keys to data within the mapped region, for use by the
+     application.  */
+
+  PTR keys[MMALLOC_KEYS];
+
+};
+
+/* Bits to look at in the malloc descriptor flags word */
+
+#define MMALLOC_DEVZERO		(1 << 0)	/* Have mapped to /dev/zero */
+#define MMALLOC_INITIALIZED	(1 << 1)	/* Initialized mmalloc */
+#define MMALLOC_MMCHECK_USED	(1 << 2)	/* mmcheckf() called already */
+
+/* Internal version of `mfree' used in `morecore'. */
+
+extern void __mmalloc_free PARAMS ((struct mdesc *, PTR));
+
+/* Hooks for debugging versions.  */
+
+extern void (*__mfree_hook) PARAMS ((PTR, PTR));
+extern PTR (*__mmalloc_hook) PARAMS ((PTR, size_t));
+extern PTR (*__mrealloc_hook) PARAMS ((PTR, PTR, size_t));
+
+/* A default malloc descriptor for the single sbrk() managed region. */
+
+extern struct mdesc *__mmalloc_default_mdp;
+
+/* Initialize the first use of the default malloc descriptor, which uses
+   an sbrk() region. */
+
+extern struct mdesc *__mmalloc_sbrk_init PARAMS ((void));
+
+/* Grow or shrink a contiguous mapped region using mmap().
+   Works much like sbrk() */
+
+#if defined(HAVE_MMAP)
+
+extern PTR __mmalloc_mmap_morecore PARAMS ((struct mdesc *, int));
+
+#endif
+
+/* Remap a mmalloc region that was previously mapped. */
+
+extern PTR __mmalloc_remap_core PARAMS ((struct mdesc *));
+
+/* Macro to convert from a user supplied malloc descriptor to pointer to the
+   internal malloc descriptor.  If the user supplied descriptor is NULL, then
+   use the default internal version, initializing it if necessary.  Otherwise
+   just cast the user supplied version (which is void *) to the proper type
+   (struct mdesc *). */
+
+#define MD_TO_MDP(md) \
+  ((md) == NULL \
+   ? (__mmalloc_default_mdp == NULL \
+      ? __mmalloc_sbrk_init () \
+      : __mmalloc_default_mdp) \
+   : (struct mdesc *) (md))
+
+#endif  /* __MMPRIVATE_H */