1155 lines
33 KiB
C
Executable File
1155 lines
33 KiB
C
Executable File
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/* gmalloc.c - THIS FILE IS AUTOMAGICALLY GENERATED SO DON'T EDIT IT. */
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/* Single-file skeleton for GNU malloc.
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Copyright 1989 Free Software Foundation
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Written May 1989 by Mike Haertel.
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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 1, 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., 675 Mass Ave, Cambridge, MA 02139, USA.
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|
|
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The author may be reached (Email) at the address mike@ai.mit.edu,
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or (US mail) as Mike Haertel c/o Free Software Foundation. */
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#define __ONEFILE
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/* DO NOT DELETE THIS LINE -- ansidecl.h INSERTED HERE. */
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/* Copyright (C) 1989 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 1, or (at your option)
|
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any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
|
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
|
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along with the GNU C Library; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* ANSI and traditional C compatibility macros
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ANSI C is assumed if __STDC__ is #defined.
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Macros
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PTR - Generic pointer type
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LONG_DOUBLE - `long double' type
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CONST - `const' keyword
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VOLATILE - `volatile' keyword
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SIGNED - `signed' keyword
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PTRCONST - Generic const pointer (void *const)
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EXFUN(name, prototype) - declare external function NAME
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with prototype PROTOTYPE
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DEFUN(name, arglist, args) - define function NAME with
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args ARGLIST of types in ARGS
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DEFUN_VOID(name) - define function NAME with no args
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AND - argument separator for ARGS
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NOARGS - null arglist
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DOTS - `...' in args
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For example:
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extern int EXFUN(printf, (CONST char *format DOTS));
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int DEFUN(fprintf, (stream, format),
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FILE *stream AND CONST char *format DOTS) { ... }
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void DEFUN_VOID(abort) { ... }
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*/
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#ifndef _ANSIDECL_H
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#define _ANSIDECL_H 1
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/* Every source file includes this file,
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so they will all get the switch for lint. */
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/* LINTLIBRARY */
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#ifdef __STDC__
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#define PTR void *
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#define PTRCONST void *CONST
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#define LONG_DOUBLE long double
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#define AND ,
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#define NOARGS void
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#define CONST const
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#define VOLATILE volatile
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#define SIGNED signed
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#define DOTS , ...
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#define EXFUN(name, proto) name proto
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#define DEFUN(name, arglist, args) name(args)
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#define DEFUN_VOID(name) name(NOARGS)
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#else /* Not ANSI C. */
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#define PTR char *
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#define PTRCONST PTR
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#define LONG_DOUBLE double
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#define AND ;
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#define NOARGS
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#define CONST
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#define VOLATILE
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#define SIGNED
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#define DOTS
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#define EXFUN(name, proto) name()
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#define DEFUN(name, arglist, args) name arglist args;
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#define DEFUN_VOID(name) name()
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#endif /* ANSI C. */
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#endif /* ansidecl.h */
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#ifdef __STDC__
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#include <limits.h>
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#else
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/* DO NOT DELETE THIS LINE -- limits.h INSERTED HERE. */
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/* Number of bits in a `char'. */
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#define CHAR_BIT 8
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/* No multibyte characters supported yet. */
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#define MB_LEN_MAX 1
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/* Minimum and maximum values a `signed char' can hold. */
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#define SCHAR_MIN -128
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#define SCHAR_MAX 127
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/* Maximum value an `unsigned char' can hold. (Minimum is 0). */
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#define UCHAR_MAX 255U
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/* Minimum and maximum values a `char' can hold. */
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#ifdef __CHAR_UNSIGNED__
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#define CHAR_MIN 0
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#define CHAR_MAX 255U
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#else
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#define CHAR_MIN -128
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#define CHAR_MAX 127
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#endif
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/* Minimum and maximum values a `signed short int' can hold. */
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#define SHRT_MIN -32768
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#define SHRT_MAX 32767
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/* Maximum value an `unsigned short int' can hold. (Minimum is 0). */
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#define USHRT_MAX 65535U
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/* Minimum and maximum values a `signed int' can hold. */
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#define INT_MIN -2147483648
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#define INT_MAX 2147483647
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/* Maximum value an `unsigned int' can hold. (Minimum is 0). */
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#define UINT_MAX 4294967295U
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/* Minimum and maximum values a `signed long int' can hold.
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(Same as `int'). */
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#define LONG_MIN (-LONG_MAX-1)
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#define LONG_MAX 2147483647
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/* Maximum value an `unsigned long int' can hold. (Minimum is 0). */
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#define ULONG_MAX 4294967295U
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#endif
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#ifdef __STDC__
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#include <stddef.h>
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#else
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/* DO NOT DELETE THIS LINE -- stddef.h INSERTED HERE. */
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#ifndef _STDDEF_H
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#define _STDDEF_H
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/* Signed type of difference of two pointers. */
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typedef long ptrdiff_t;
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/* Unsigned type of `sizeof' something. */
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#ifndef _SIZE_T /* in case <sys/types.h> has defined it. */
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#define _SIZE_T
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typedef unsigned long size_t;
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#endif /* _SIZE_T */
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/* A null pointer constant. */
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#undef NULL /* in case <stdio.h> has defined it. */
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#define NULL 0
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/* Offset of member MEMBER in a struct of type TYPE. */
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#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
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#endif /* _STDDEF_H */
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#endif
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/* DO NOT DELETE THIS LINE -- stdlib.h INSERTED HERE. */
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/* Fake stdlib.h supplying the stuff needed by malloc. */
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#ifndef __ONEFILE
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#include <stddef.h>
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#endif
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extern void EXFUN(abort, (void));
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extern void EXFUN(free, (PTR));
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extern PTR EXFUN(malloc, (size_t));
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extern PTR EXFUN(realloc, (PTR, size_t));
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/* DO NOT DELETE THIS LINE -- string.h INSERTED HERE. */
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/* Fake string.h supplying stuff used by malloc. */
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#ifndef __ONEFILE
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#include <stddef.h>
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#endif
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extern PTR EXFUN(memcpy, (PTR, PTR, size_t));
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extern PTR EXFUN(memset, (PTR, int, size_t));
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#define memmove memcpy
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#define _MALLOC_INTERNAL
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/* DO NOT DELETE THIS LINE -- malloc.h INSERTED HERE. */
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/* Declarations for `malloc' and friends.
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Copyright 1990 Free Software Foundation
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Written May 1989 by Mike Haertel.
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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 1, 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., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
|
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The author may be reached (Email) at the address mike@@ai.mit.edu,
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or (US mail) as Mike Haertel c/o Free Software Foundation. */
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#ifndef _MALLOC_H
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#define _MALLOC_H 1
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#ifndef __ONEFILE
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#define __need_NULL
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#define __need_size_t
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#define __need_ptrdiff_t
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#include <stddef.h>
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#endif
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#ifdef _MALLOC_INTERNAL
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#ifndef __ONEFILE
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#include <limits.h>
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#endif
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/* The allocator divides the heap into blocks of fixed size; large
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requests receive one or more whole blocks, and small requests
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receive a fragment of a block. Fragment sizes are powers of two,
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and all fragments of a block are the same size. When all the
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fragments in a block have been freed, the block itself is freed. */
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#define INT_BIT (CHAR_BIT * sizeof(int))
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#define BLOCKLOG (INT_BIT > 16 ? 12 : 9)
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#define BLOCKSIZE (1 << BLOCKLOG)
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#define BLOCKIFY(SIZE) (((SIZE) + BLOCKSIZE - 1) / BLOCKSIZE)
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/* Determine the amount of memory spanned by the initial heap table
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(not an absolute limit). */
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#define HEAP (INT_BIT > 16 ? 4194304 : 65536)
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/* Number of contiguous free blocks allowed to build up at the end of
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memory before they will be returned to the system. */
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#define FINAL_FREE_BLOCKS 8
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/* Where to start searching the free list when looking for new memory.
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The two possible values are 0 and _heapindex. Starting at 0 seems
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to reduce total memory usage, while starting at _heapindex seems to
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run faster. */
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#define MALLOC_SEARCH_START _heapindex
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/* Data structure giving per-block information. */
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typedef union
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{
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/* Heap information for a busy block. */
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struct
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{
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/* Zero for a large block, or positive giving the
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logarithm to the base two of the fragment size. */
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int type;
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union
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{
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struct
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{
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size_t nfree; /* Free fragments in a fragmented block. */
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size_t first; /* First free fragment of the block. */
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} frag;
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/* Size (in blocks) of a large cluster. */
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size_t size;
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} info;
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} busy;
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/* Heap information for a free block (that may be the first of
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a free cluster). */
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struct
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{
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size_t size; /* Size (in blocks) of a free cluster. */
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size_t next; /* Index of next free cluster. */
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size_t prev; /* Index of previous free cluster. */
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} free;
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} malloc_info;
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/* Pointer to first block of the heap. */
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extern char *_heapbase;
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/* Table indexed by block number giving per-block information. */
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extern malloc_info *_heapinfo;
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/* Address to block number and vice versa. */
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#define BLOCK(A) (((char *) (A) - _heapbase) / BLOCKSIZE + 1)
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#define ADDRESS(B) ((PTR) (((B) - 1) * BLOCKSIZE + _heapbase))
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/* Current search index for the heap table. */
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extern size_t _heapindex;
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/* Limit of valid info table indices. */
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extern size_t _heaplimit;
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/* Doubly linked lists of free fragments. */
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struct list
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{
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struct list *next;
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struct list *prev;
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};
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/* Free list headers for each fragment size. */
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extern struct list _fraghead[];
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/* Instrumentation. */
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extern size_t _chunks_used;
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extern size_t _bytes_used;
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extern size_t _chunks_free;
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extern size_t _bytes_free;
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/* Internal version of free() used in morecore(). */
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extern void EXFUN(__free, (PTR __ptr));
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#endif /* _MALLOC_INTERNAL. */
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/* Underlying allocation function; successive calls should
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return contiguous pieces of memory. */
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extern PTR EXFUN((*__morecore), (ptrdiff_t __size));
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/* Default value of previous. */
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extern PTR EXFUN(__default_morecore, (ptrdiff_t __size));
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/* Flag whether malloc has been called. */
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extern int __malloc_initialized;
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/* Hooks for debugging versions. */
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extern void EXFUN((*__free_hook), (PTR __ptr));
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extern PTR EXFUN((*__malloc_hook), (size_t __size));
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extern PTR EXFUN((*__realloc_hook), (PTR __ptr, size_t __size));
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/* Activate a standard collection of debugging hooks. */
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extern void EXFUN(mcheck, (void EXFUN((*func), (void))));
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/* Statistics available to the user. */
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struct mstats
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{
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size_t bytes_total; /* Total size of the heap. */
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size_t chunks_used; /* Chunks allocated by the user. */
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size_t bytes_used; /* Byte total of user-allocated chunks. */
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size_t chunks_free; /* Chunks in the free list. */
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size_t bytes_free; /* Byte total of chunks in the free list. */
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};
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/* Pick up the current statistics. */
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extern struct mstats EXFUN(mstats, (NOARGS));
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#endif /* malloc.h */
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/* DO NOT DELETE THIS LINE -- free.c INSERTED HERE. */
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/* Free a block of memory allocated by `malloc'.
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Copyright 1990 Free Software Foundation
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Written May 1989 by Mike Haertel.
|
|
|
|
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 1, 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., 675 Mass Ave, Cambridge, MA 02139, 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. */
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#ifndef __ONEFILE
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#include "ansidecl.h"
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#include <stddef.h>
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#include <stdlib.h>
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#define _MALLOC_INTERNAL
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#include "malloc.h"
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#endif /* __ONEFILE */
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/* Debugging hook for free. */
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void EXFUN((*__free_hook), (PTR __ptr));
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/* Return memory to the heap. Like free() but don't call a __free_hook
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if there is one. */
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void
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DEFUN(__free, (ptr), PTR ptr)
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{
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int type;
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size_t block, blocks;
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register size_t i;
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struct list *prev, *next;
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block = BLOCK(ptr);
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type = _heapinfo[block].busy.type;
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switch (type)
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{
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case 0:
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/* Get as many statistics as early as we can. */
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--_chunks_used;
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_bytes_used -= _heapinfo[block].busy.info.size * BLOCKSIZE;
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_bytes_free += _heapinfo[block].busy.info.size * BLOCKSIZE;
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/* Find the free cluster previous to this one in the free list.
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Start searching at the last block referenced; this may benefit
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programs with locality of allocation. */
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i = _heapindex;
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if (i > block)
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while (i > block)
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i = _heapinfo[i].free.prev;
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else
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{
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do
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i = _heapinfo[i].free.next;
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while (i > 0 && i < block);
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i = _heapinfo[i].free.prev;
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}
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|
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/* Determine how to link this block into the free list. */
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if (block == i + _heapinfo[i].free.size)
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{
|
|
/* Coalesce this block with its predecessor. */
|
|
_heapinfo[i].free.size += _heapinfo[block].busy.info.size;
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block = i;
|
|
}
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else
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{
|
|
/* Really link this block back into the free list. */
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_heapinfo[block].free.size = _heapinfo[block].busy.info.size;
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_heapinfo[block].free.next = _heapinfo[i].free.next;
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_heapinfo[block].free.prev = i;
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_heapinfo[i].free.next = block;
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_heapinfo[_heapinfo[block].free.next].free.prev = block;
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|
++_chunks_free;
|
|
}
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|
|
|
/* Now that the block is linked in, see if we can coalesce it
|
|
with its successor (by deleting its successor from the list
|
|
and adding in its size). */
|
|
if (block + _heapinfo[block].free.size == _heapinfo[block].free.next)
|
|
{
|
|
_heapinfo[block].free.size
|
|
+= _heapinfo[_heapinfo[block].free.next].free.size;
|
|
_heapinfo[block].free.next
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|
= _heapinfo[_heapinfo[block].free.next].free.next;
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|
_heapinfo[_heapinfo[block].free.next].free.prev = block;
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|
--_chunks_free;
|
|
}
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|
|
|
/* Now see if we can return stuff to the system. */
|
|
blocks = _heapinfo[block].free.size;
|
|
if (blocks >= FINAL_FREE_BLOCKS && block + blocks == _heaplimit
|
|
&& (*__morecore)(0) == ADDRESS(block + blocks))
|
|
{
|
|
register size_t bytes = blocks * BLOCKSIZE;
|
|
_heaplimit -= blocks;
|
|
(*__morecore)(- bytes);
|
|
_heapinfo[_heapinfo[block].free.prev].free.next
|
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= _heapinfo[block].free.next;
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|
_heapinfo[_heapinfo[block].free.next].free.prev
|
|
= _heapinfo[block].free.prev;
|
|
block = _heapinfo[block].free.prev;
|
|
--_chunks_free;
|
|
_bytes_free -= bytes;
|
|
}
|
|
|
|
/* Set the next search to begin at this block. */
|
|
_heapindex = block;
|
|
break;
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|
|
|
default:
|
|
/* Do some of the statistics. */
|
|
--_chunks_used;
|
|
_bytes_used -= 1 << type;
|
|
++_chunks_free;
|
|
_bytes_free += 1 << type;
|
|
|
|
/* Get the address of the first free fragment in this block. */
|
|
prev = (struct list *) ((char *) ADDRESS(block) +
|
|
(_heapinfo[block].busy.info.frag.first << type));
|
|
|
|
if (_heapinfo[block].busy.info.frag.nfree == (BLOCKSIZE >> type) - 1)
|
|
{
|
|
/* If all fragments of this block are free, remove them
|
|
from the fragment list and free the whole block. */
|
|
next = prev;
|
|
for (i = 1; i < BLOCKSIZE >> type; ++i)
|
|
next = next->next;
|
|
prev->prev->next = next;
|
|
if (next != NULL)
|
|
next->prev = prev->prev;
|
|
_heapinfo[block].busy.type = 0;
|
|
_heapinfo[block].busy.info.size = 1;
|
|
|
|
/* Keep the statistics accurate. */
|
|
++_chunks_used;
|
|
_bytes_used += BLOCKSIZE;
|
|
_chunks_free -= BLOCKSIZE >> type;
|
|
_bytes_free -= BLOCKSIZE;
|
|
|
|
free(ADDRESS(block));
|
|
}
|
|
else if (_heapinfo[block].busy.info.frag.nfree != 0)
|
|
{
|
|
/* If some fragments of this block are free, link this
|
|
fragment into the fragment list after the first free
|
|
fragment of this block. */
|
|
next = (struct list *) ptr;
|
|
next->next = prev->next;
|
|
next->prev = prev;
|
|
prev->next = next;
|
|
if (next->next != NULL)
|
|
next->next->prev = next;
|
|
++_heapinfo[block].busy.info.frag.nfree;
|
|
}
|
|
else
|
|
{
|
|
/* No fragments of this block are free, so link this
|
|
fragment into the fragment list and announce that
|
|
it is the first free fragment of this block. */
|
|
prev = (struct list *) ptr;
|
|
_heapinfo[block].busy.info.frag.nfree = 1;
|
|
_heapinfo[block].busy.info.frag.first = (unsigned int)
|
|
(((char *) ptr - (char *) NULL) % BLOCKSIZE >> type);
|
|
prev->next = _fraghead[type].next;
|
|
prev->prev = &_fraghead[type];
|
|
prev->prev->next = prev;
|
|
if (prev->next != NULL)
|
|
prev->next->prev = prev;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Return memory to the heap. */
|
|
void
|
|
DEFUN(free, (ptr), PTR ptr)
|
|
{
|
|
if (ptr == NULL)
|
|
return;
|
|
|
|
if (__free_hook != NULL)
|
|
(*__free_hook)(ptr);
|
|
else
|
|
__free (ptr);
|
|
}
|
|
|
|
/* DO NOT DELETE THIS LINE -- malloc.c INSERTED HERE. */
|
|
/* Memory allocator `malloc'.
|
|
Copyright 1990 Free Software Foundation
|
|
Written May 1989 by Mike Haertel.
|
|
|
|
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 1, 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., 675 Mass Ave, Cambridge, MA 02139, 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 __ONEFILE
|
|
#include "ansidecl.h"
|
|
#include <stddef.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#define _MALLOC_INTERNAL
|
|
#include "malloc.h"
|
|
#endif /* __ONEFILE */
|
|
|
|
/* How to really get more memory. */
|
|
PTR EXFUN((*__morecore), (ptrdiff_t __size)) = __default_morecore;
|
|
|
|
/* Debugging hook for `malloc'. */
|
|
PTR EXFUN((*__malloc_hook), (size_t __size));
|
|
|
|
/* Pointer to the base of the first block. */
|
|
char *_heapbase;
|
|
|
|
/* Block information table. Allocated with align/__free (not malloc/free). */
|
|
malloc_info *_heapinfo;
|
|
|
|
/* Number of info entries. */
|
|
static size_t heapsize;
|
|
|
|
/* Search index in the info table. */
|
|
size_t _heapindex;
|
|
|
|
/* Limit of valid info table indices. */
|
|
size_t _heaplimit;
|
|
|
|
/* Free lists for each fragment size. */
|
|
struct list _fraghead[BLOCKLOG];
|
|
|
|
/* Instrumentation. */
|
|
size_t _chunks_used;
|
|
size_t _bytes_used;
|
|
size_t _chunks_free;
|
|
size_t _bytes_free;
|
|
|
|
/* Are you experienced? */
|
|
int __malloc_initialized;
|
|
|
|
/* Aligned allocation. */
|
|
static PTR
|
|
DEFUN(align, (size), size_t size)
|
|
{
|
|
PTR result;
|
|
unsigned int adj;
|
|
|
|
result = (*__morecore)(size);
|
|
adj = (unsigned int) ((char *) result - (char *) NULL) % BLOCKSIZE;
|
|
if (adj != 0)
|
|
{
|
|
adj = BLOCKSIZE - adj;
|
|
(void) (*__morecore)(adj);
|
|
result = (char *) result + adj;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/* Set everything up and remember that we have. */
|
|
static int
|
|
DEFUN_VOID(initialize)
|
|
{
|
|
heapsize = HEAP / BLOCKSIZE;
|
|
_heapinfo = (malloc_info *) align(heapsize * sizeof(malloc_info));
|
|
if (_heapinfo == NULL)
|
|
return 0;
|
|
memset(_heapinfo, 0, heapsize * sizeof(malloc_info));
|
|
_heapinfo[0].free.size = 0;
|
|
_heapinfo[0].free.next = _heapinfo[0].free.prev = 0;
|
|
_heapindex = 0;
|
|
_heapbase = (char *) _heapinfo;
|
|
__malloc_initialized = 1;
|
|
return 1;
|
|
}
|
|
|
|
/* Get neatly aligned memory, initializing or
|
|
growing the heap info table as necessary. */
|
|
static PTR
|
|
DEFUN(morecore, (size), size_t size)
|
|
{
|
|
PTR result;
|
|
malloc_info *newinfo, *oldinfo;
|
|
size_t newsize;
|
|
|
|
result = align(size);
|
|
if (result == NULL)
|
|
return NULL;
|
|
|
|
/* Check if we need to grow the info table. */
|
|
if (BLOCK((char *) result + size) > heapsize)
|
|
{
|
|
newsize = heapsize;
|
|
while (BLOCK((char *) result + size) > newsize)
|
|
newsize *= 2;
|
|
newinfo = (malloc_info *) align(newsize * sizeof(malloc_info));
|
|
if (newinfo == NULL)
|
|
{
|
|
(*__morecore)(- size);
|
|
return NULL;
|
|
}
|
|
memset(newinfo, 0, newsize * sizeof(malloc_info));
|
|
memcpy(newinfo, _heapinfo, heapsize * sizeof(malloc_info));
|
|
oldinfo = _heapinfo;
|
|
newinfo[BLOCK(oldinfo)].busy.type = 0;
|
|
newinfo[BLOCK(oldinfo)].busy.info.size
|
|
= BLOCKIFY(heapsize * sizeof(malloc_info));
|
|
_heapinfo = newinfo;
|
|
__free(oldinfo);
|
|
heapsize = newsize;
|
|
}
|
|
|
|
_heaplimit = BLOCK((char *) result + size);
|
|
return result;
|
|
}
|
|
|
|
/* Allocate memory from the heap. */
|
|
PTR
|
|
DEFUN(malloc, (size), size_t size)
|
|
{
|
|
PTR result;
|
|
size_t block, blocks, lastblocks, start;
|
|
register size_t i;
|
|
struct list *next;
|
|
|
|
if (size == 0)
|
|
return NULL;
|
|
|
|
if (__malloc_hook != NULL)
|
|
return (*__malloc_hook)(size);
|
|
|
|
if (!__malloc_initialized)
|
|
if (!initialize())
|
|
return NULL;
|
|
|
|
if (size < sizeof(struct list))
|
|
size = sizeof(struct list);
|
|
|
|
/* Determine the allocation policy based on the request size. */
|
|
if (size <= BLOCKSIZE / 2)
|
|
{
|
|
/* Small allocation to receive a fragment of a block.
|
|
Determine the logarithm to base two of the fragment size. */
|
|
register size_t log = 1;
|
|
--size;
|
|
while ((size /= 2) != 0)
|
|
++log;
|
|
|
|
/* Look in the fragment lists for a
|
|
free fragment of the desired size. */
|
|
next = _fraghead[log].next;
|
|
if (next != NULL)
|
|
{
|
|
/* There are free fragments of this size.
|
|
Pop a fragment out of the fragment list and return it.
|
|
Update the block's nfree and first counters. */
|
|
result = (PTR) next;
|
|
next->prev->next = next->next;
|
|
if (next->next != NULL)
|
|
next->next->prev = next->prev;
|
|
block = BLOCK(result);
|
|
if (--_heapinfo[block].busy.info.frag.nfree != 0)
|
|
_heapinfo[block].busy.info.frag.first = (unsigned int)
|
|
(((char *) next->next - (char *) NULL) % BLOCKSIZE) >> log;
|
|
|
|
/* Update the statistics. */
|
|
++_chunks_used;
|
|
_bytes_used += 1 << log;
|
|
--_chunks_free;
|
|
_bytes_free -= 1 << log;
|
|
}
|
|
else
|
|
{
|
|
/* No free fragments of the desired size, so get a new block
|
|
and break it into fragments, returning the first. */
|
|
result = malloc(BLOCKSIZE);
|
|
if (result == NULL)
|
|
return NULL;
|
|
|
|
/* Link all fragments but the first into the free list. */
|
|
for (i = 1; i < BLOCKSIZE >> log; ++i)
|
|
{
|
|
next = (struct list *) ((char *) result + (i << log));
|
|
next->next = _fraghead[log].next;
|
|
next->prev = &_fraghead[log];
|
|
next->prev->next = next;
|
|
if (next->next != NULL)
|
|
next->next->prev = next;
|
|
}
|
|
|
|
/* Initialize the nfree and first counters for this block. */
|
|
block = BLOCK(result);
|
|
_heapinfo[block].busy.type = log;
|
|
_heapinfo[block].busy.info.frag.nfree = i - 1;
|
|
_heapinfo[block].busy.info.frag.first = i - 1;
|
|
|
|
_chunks_free += (BLOCKSIZE >> log) - 1;
|
|
_bytes_free += BLOCKSIZE - (1 << log);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* Large allocation to receive one or more blocks.
|
|
Search the free list in a circle starting at the last place visited.
|
|
If we loop completely around without finding a large enough
|
|
space we will have to get more memory from the system. */
|
|
blocks = BLOCKIFY(size);
|
|
start = block = MALLOC_SEARCH_START;
|
|
while (_heapinfo[block].free.size < blocks)
|
|
{
|
|
block = _heapinfo[block].free.next;
|
|
if (block == start)
|
|
{
|
|
/* Need to get more from the system. Check to see if
|
|
the new core will be contiguous with the final free
|
|
block; if so we don't need to get as much. */
|
|
block = _heapinfo[0].free.prev;
|
|
lastblocks = _heapinfo[block].free.size;
|
|
if (_heaplimit != 0 && block + lastblocks == _heaplimit &&
|
|
(*__morecore)(0) == ADDRESS(block + lastblocks) &&
|
|
(morecore((blocks - lastblocks) * BLOCKSIZE)) != NULL)
|
|
{
|
|
_heapinfo[block].free.size = blocks;
|
|
_bytes_free += (blocks - lastblocks) * BLOCKSIZE;
|
|
continue;
|
|
}
|
|
result = morecore(blocks * BLOCKSIZE);
|
|
if (result == NULL)
|
|
return NULL;
|
|
block = BLOCK(result);
|
|
_heapinfo[block].busy.type = 0;
|
|
_heapinfo[block].busy.info.size = blocks;
|
|
++_chunks_used;
|
|
_bytes_used += blocks * BLOCKSIZE;
|
|
return result;
|
|
}
|
|
}
|
|
|
|
/* At this point we have found a suitable free list entry.
|
|
Figure out how to remove what we need from the list. */
|
|
result = ADDRESS(block);
|
|
if (_heapinfo[block].free.size > blocks)
|
|
{
|
|
/* The block we found has a bit left over,
|
|
so relink the tail end back into the free list. */
|
|
_heapinfo[block + blocks].free.size
|
|
= _heapinfo[block].free.size - blocks;
|
|
_heapinfo[block + blocks].free.next
|
|
= _heapinfo[block].free.next;
|
|
_heapinfo[block + blocks].free.prev
|
|
= _heapinfo[block].free.prev;
|
|
_heapinfo[_heapinfo[block].free.prev].free.next
|
|
= _heapinfo[_heapinfo[block].free.next].free.prev
|
|
= _heapindex = block + blocks;
|
|
}
|
|
else
|
|
{
|
|
/* The block exactly matches our requirements,
|
|
so just remove it from the list. */
|
|
_heapinfo[_heapinfo[block].free.next].free.prev
|
|
= _heapinfo[block].free.prev;
|
|
_heapinfo[_heapinfo[block].free.prev].free.next
|
|
= _heapindex = _heapinfo[block].free.next;
|
|
--_chunks_free;
|
|
}
|
|
|
|
_heapinfo[block].busy.type = 0;
|
|
_heapinfo[block].busy.info.size = blocks;
|
|
++_chunks_used;
|
|
_bytes_used += blocks * BLOCKSIZE;
|
|
_bytes_free -= blocks * BLOCKSIZE;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/* DO NOT DELETE THIS LINE -- realloc.c INSERTED HERE. */
|
|
/* Change the size of a block allocated by `malloc'.
|
|
Copyright 1990 Free Software Foundation
|
|
Written May 1989 by Mike Haertel.
|
|
|
|
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 1, 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., 675 Mass Ave, Cambridge, MA 02139, 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 __ONEFILE
|
|
#include "ansidecl.h"
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#define _MALLOC_INTERNAL
|
|
#include "malloc.h"
|
|
#endif /* __ONEFILE */
|
|
|
|
#define MIN(A, B) ((A) < (B) ? (A) : (B))
|
|
|
|
/* Debugging hook for realloc. */
|
|
PTR EXFUN((*__realloc_hook), (PTR __ptr, size_t __size));
|
|
|
|
/* Resize the given region to the new size, returning a pointer
|
|
to the (possibly moved) region. This is optimized for speed;
|
|
some benchmarks seem to indicate that greater compactness is
|
|
achieved by unconditionally allocating and copying to a
|
|
new region. This module has incestuous knowledge of the
|
|
internals of both free and malloc. */
|
|
PTR
|
|
DEFUN(realloc, (ptr, size), PTR ptr AND size_t size)
|
|
{
|
|
PTR result;
|
|
int type;
|
|
size_t block, blocks, oldlimit;
|
|
|
|
if (size == 0)
|
|
{
|
|
free(ptr);
|
|
return NULL;
|
|
}
|
|
else if (ptr == NULL)
|
|
return malloc(size);
|
|
|
|
if (__realloc_hook != NULL)
|
|
return (*__realloc_hook)(ptr, size);
|
|
|
|
block = BLOCK(ptr);
|
|
|
|
type = _heapinfo[block].busy.type;
|
|
switch (type)
|
|
{
|
|
case 0:
|
|
/* Maybe reallocate a large block to a small fragment. */
|
|
if (size <= BLOCKSIZE / 2)
|
|
{
|
|
result = malloc(size);
|
|
if (result != NULL)
|
|
{
|
|
memcpy(result, ptr, size);
|
|
free(ptr);
|
|
return result;
|
|
}
|
|
}
|
|
|
|
/* The new size is a large allocation as well;
|
|
see if we can hold it in place. */
|
|
blocks = BLOCKIFY(size);
|
|
if (blocks < _heapinfo[block].busy.info.size)
|
|
{
|
|
/* The new size is smaller; return
|
|
excess memory to the free list. */
|
|
_heapinfo[block + blocks].busy.type = 0;
|
|
_heapinfo[block + blocks].busy.info.size
|
|
= _heapinfo[block].busy.info.size - blocks;
|
|
_heapinfo[block].busy.info.size = blocks;
|
|
free(ADDRESS(block + blocks));
|
|
result = ptr;
|
|
}
|
|
else if (blocks == _heapinfo[block].busy.info.size)
|
|
/* No size change necessary. */
|
|
result = ptr;
|
|
else
|
|
{
|
|
/* Won't fit, so allocate a new region that will.
|
|
Free the old region first in case there is sufficient
|
|
adjacent free space to grow without moving. */
|
|
blocks = _heapinfo[block].busy.info.size;
|
|
/* Prevent free from actually returning memory to the system. */
|
|
oldlimit = _heaplimit;
|
|
_heaplimit = 0;
|
|
free(ptr);
|
|
_heaplimit = oldlimit;
|
|
result = malloc(size);
|
|
if (result == NULL)
|
|
{
|
|
(void) malloc(blocks * BLOCKSIZE);
|
|
return NULL;
|
|
}
|
|
if (ptr != result)
|
|
memmove(result, ptr, blocks * BLOCKSIZE);
|
|
}
|
|
break;
|
|
|
|
default:
|
|
/* Old size is a fragment; type is logarithm
|
|
to base two of the fragment size. */
|
|
if (size > 1 << (type - 1) && size <= 1 << type)
|
|
/* The new size is the same kind of fragment. */
|
|
result = ptr;
|
|
else
|
|
{
|
|
/* The new size is different; allocate a new space,
|
|
and copy the lesser of the new size and the old. */
|
|
result = malloc(size);
|
|
if (result == NULL)
|
|
return NULL;
|
|
memcpy(result, ptr, MIN(size, 1 << type));
|
|
free(ptr);
|
|
}
|
|
break;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/* DO NOT DELETE THIS LINE -- unix.c INSERTED HERE. */
|
|
/* unix.c - get more memory with a UNIX system call.
|
|
Copyright 1990 Free Software Foundation
|
|
Written May 1989 by Mike Haertel.
|
|
|
|
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 1, 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., 675 Mass Ave, Cambridge, MA 02139, 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 __ONEFILE
|
|
#include "ansidecl.h"
|
|
#include <stddef.h>
|
|
|
|
#define _MALLOC_INTERNAL
|
|
#include "malloc.h"
|
|
#endif /* __ONEFILE */
|
|
|
|
extern PTR EXFUN(sbrk, (ptrdiff_t size));
|
|
|
|
PTR
|
|
DEFUN(__default_morecore, (size), ptrdiff_t size)
|
|
{
|
|
PTR result;
|
|
|
|
result = sbrk(size);
|
|
if (result == (PTR) -1)
|
|
return NULL;
|
|
return result;
|
|
}
|
|
|
|
#define __getpagesize getpagesize
|
|
/* DO NOT DELETE THIS LINE -- valloc.c INSERTED HERE. */
|
|
/* Allocate memory on a page boundary.
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Copyright 1990 Free Software Foundation
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Written May 1989 by Mike Haertel.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 1, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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The author may be reached (Email) at the address mike@ai.mit.edu,
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or (US mail) as Mike Haertel c/o Free Software Foundation. */
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#ifndef __ONEFILE
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#include "ansidecl.h"
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#include <stdlib.h>
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#endif /* __ONEFILE */
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#if 0
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/* On SunOS 4.1.1, <sys/param.h> typedefs size_t, which is bad since
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we typedef it above. Maybe it's better just to have people compile
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-Dgetpagesize()=4096. */
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/* Deal with page size. */
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#ifdef BSD
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#ifndef BSD4_1
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#define HAVE_GETPAGESIZE
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#endif
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#endif
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#ifndef HAVE_GETPAGESIZE
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#include <sys/param.h>
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#if !defined (PAGESIZE)
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#ifdef EXEC_PAGESIZE
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#define PAGESIZE EXEC_PAGESIZE
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#else
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#ifdef NBPG
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#define PAGESIZE NBPG * CLSIZE
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#ifndef CLSIZE
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#define CLSIZE 1
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#endif /* no CLSIZE */
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#else /* no NBPG */
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#define PAGESIZE NBPC
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#endif /* no NBPG */
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#endif /* no EXEC_PAGESIZE */
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#endif /* no PAGESIZE */
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size_t
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DEFUN_VOID(__getpagesize)
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{
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return PAGESIZE;
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}
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#endif /* not HAVE_GETPAGESIZE */
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#endif /* 0 */
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extern size_t EXFUN(__getpagesize, (NOARGS));
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static size_t pagesize;
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PTR
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DEFUN(valloc, (size), size_t size)
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{
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PTR result;
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unsigned int adj;
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if (pagesize == 0)
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pagesize = __getpagesize();
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result = malloc(size + pagesize);
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if (result == NULL)
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return NULL;
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adj = (unsigned int) ((char *) result - (char *) NULL) % pagesize;
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if (adj != 0)
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result = (char *) result + pagesize - adj;
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return result;
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}
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