c93a17b7ab
* mmalloc.h: check if STDC_HEADERS instead of __STDC__.
* mmprivate.h: check if STDC_HEADERS instead of __STDC__.
This change is necessary to build under AIX 3.2.5 w/ cc after Stan's
Oct 24 change. I'm not convinced that changing mmalloc.h in this way
is such a good thing--if a directory that doesn't use autoconf (or one
that DOES use autoconf but doesn't put all the defines on the command
line), and it includes mmalloc.h, the right thing won't happen.
I believe gdb is the only directory which uses mmalloc, though, so
it should be OK.
353 lines
11 KiB
C
353 lines
11 KiB
C
/* 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 STDC_HEADERS
|
|
# include <limits.h>
|
|
# ifndef NULL
|
|
# define NULL (void *) 0
|
|
# endif
|
|
#else
|
|
# ifndef size_t
|
|
# define size_t unsigned int
|
|
# endif
|
|
# ifndef CHAR_BIT
|
|
# define CHAR_BIT 8
|
|
# endif
|
|
# ifndef NULL
|
|
# define NULL 0
|
|
# 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) /* mmcheck() 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 */
|