413 lines
14 KiB
C
413 lines
14 KiB
C
/* obstack.c - subroutines used implicitly by object stack macros
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Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1996, 1997, 1998,
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1999, 2000, 2001, 2002, 2003, 2004, 2005 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
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include "git-compat-util.h"
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#include <gettext.h>
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#include "obstack.h"
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/* NOTE BEFORE MODIFYING THIS FILE: This version number must be
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incremented whenever callers compiled using an old obstack.h can no
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longer properly call the functions in this obstack.c. */
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#define OBSTACK_INTERFACE_VERSION 1
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/* Comment out all this code if we are using the GNU C Library, and are not
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actually compiling the library itself, and the installed library
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supports the same library interface we do. This code is part of the GNU
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C Library, but also included in many other GNU distributions. Compiling
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and linking in this code is a waste when using the GNU C library
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(especially if it is a shared library). Rather than having every GNU
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program understand `configure --with-gnu-libc' and omit the object
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files, it is simpler to just do this in the source for each such file. */
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#include <stdio.h> /* Random thing to get __GNU_LIBRARY__. */
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#if !defined _LIBC && defined __GNU_LIBRARY__ && __GNU_LIBRARY__ > 1
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# include <gnu-versions.h>
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# if _GNU_OBSTACK_INTERFACE_VERSION == OBSTACK_INTERFACE_VERSION
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# define ELIDE_CODE
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# endif
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#endif
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#include <stddef.h>
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#ifndef ELIDE_CODE
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# if HAVE_INTTYPES_H
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# include <inttypes.h>
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# endif
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# if HAVE_STDINT_H || defined _LIBC
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# include <stdint.h>
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# endif
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/* Determine default alignment. */
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union fooround
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{
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uintmax_t i;
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long double d;
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void *p;
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};
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struct fooalign
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{
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char c;
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union fooround u;
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};
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/* If malloc were really smart, it would round addresses to DEFAULT_ALIGNMENT.
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But in fact it might be less smart and round addresses to as much as
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DEFAULT_ROUNDING. So we prepare for it to do that. */
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enum
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{
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DEFAULT_ALIGNMENT = offsetof (struct fooalign, u),
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DEFAULT_ROUNDING = sizeof (union fooround)
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};
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/* When we copy a long block of data, this is the unit to do it with.
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On some machines, copying successive ints does not work;
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in such a case, redefine COPYING_UNIT to `long' (if that works)
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or `char' as a last resort. */
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# ifndef COPYING_UNIT
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# define COPYING_UNIT int
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# endif
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/* The functions allocating more room by calling `obstack_chunk_alloc'
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jump to the handler pointed to by `obstack_alloc_failed_handler'.
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This can be set to a user defined function which should either
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abort gracefully or use longjump - but shouldn't return. This
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variable by default points to the internal function
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`print_and_abort'. */
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static void print_and_abort (void);
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void (*obstack_alloc_failed_handler) (void) = print_and_abort;
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# ifdef _LIBC
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# if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_3_4)
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/* A looong time ago (before 1994, anyway; we're not sure) this global variable
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was used by non-GNU-C macros to avoid multiple evaluation. The GNU C
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library still exports it because somebody might use it. */
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struct obstack *_obstack_compat;
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compat_symbol (libc, _obstack_compat, _obstack, GLIBC_2_0);
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# endif
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# endif
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/* Define a macro that either calls functions with the traditional malloc/free
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calling interface, or calls functions with the mmalloc/mfree interface
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(that adds an extra first argument), based on the state of use_extra_arg.
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For free, do not use ?:, since some compilers, like the MIPS compilers,
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do not allow (expr) ? void : void. */
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# define CALL_CHUNKFUN(h, size) \
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(((h) -> use_extra_arg) \
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? (*(h)->chunkfun.extra) ((h)->extra_arg, (size)) \
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: (*(h)->chunkfun.plain) ((size)))
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# define CALL_FREEFUN(h, old_chunk) \
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do { \
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if ((h) -> use_extra_arg) \
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(*(h)->freefun.extra) ((h)->extra_arg, (old_chunk)); \
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else \
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(*(h)->freefun.plain) ((old_chunk)); \
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} while (0)
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/* Initialize an obstack H for use. Specify chunk size SIZE (0 means default).
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Objects start on multiples of ALIGNMENT (0 means use default).
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CHUNKFUN is the function to use to allocate chunks,
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and FREEFUN the function to free them.
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Return nonzero if successful, calls obstack_alloc_failed_handler if
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allocation fails. */
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int
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_obstack_begin (struct obstack *h,
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int size, int alignment,
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void *(*chunkfun) (long),
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void (*freefun) (void *))
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{
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register struct _obstack_chunk *chunk; /* points to new chunk */
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if (alignment == 0)
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alignment = DEFAULT_ALIGNMENT;
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if (size == 0)
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/* Default size is what GNU malloc can fit in a 4096-byte block. */
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{
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/* 12 is sizeof (mhead) and 4 is EXTRA from GNU malloc.
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Use the values for range checking, because if range checking is off,
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the extra bytes won't be missed terribly, but if range checking is on
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and we used a larger request, a whole extra 4096 bytes would be
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allocated.
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These number are irrelevant to the new GNU malloc. I suspect it is
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less sensitive to the size of the request. */
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int extra = ((((12 + DEFAULT_ROUNDING - 1) & ~(DEFAULT_ROUNDING - 1))
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+ 4 + DEFAULT_ROUNDING - 1)
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& ~(DEFAULT_ROUNDING - 1));
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size = 4096 - extra;
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}
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h->chunkfun.plain = chunkfun;
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h->freefun.plain = freefun;
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h->chunk_size = size;
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h->alignment_mask = alignment - 1;
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h->use_extra_arg = 0;
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chunk = h->chunk = CALL_CHUNKFUN (h, h -> chunk_size);
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if (!chunk)
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(*obstack_alloc_failed_handler) ();
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h->next_free = h->object_base = __PTR_ALIGN ((char *) chunk, chunk->contents,
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alignment - 1);
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h->chunk_limit = chunk->limit
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= (char *) chunk + h->chunk_size;
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chunk->prev = NULL;
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/* The initial chunk now contains no empty object. */
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h->maybe_empty_object = 0;
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h->alloc_failed = 0;
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return 1;
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}
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int
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_obstack_begin_1 (struct obstack *h, int size, int alignment,
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void *(*chunkfun) (void *, long),
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void (*freefun) (void *, void *),
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void *arg)
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{
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register struct _obstack_chunk *chunk; /* points to new chunk */
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if (alignment == 0)
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alignment = DEFAULT_ALIGNMENT;
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if (size == 0)
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/* Default size is what GNU malloc can fit in a 4096-byte block. */
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{
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/* 12 is sizeof (mhead) and 4 is EXTRA from GNU malloc.
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Use the values for range checking, because if range checking is off,
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the extra bytes won't be missed terribly, but if range checking is on
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and we used a larger request, a whole extra 4096 bytes would be
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allocated.
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These number are irrelevant to the new GNU malloc. I suspect it is
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less sensitive to the size of the request. */
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int extra = ((((12 + DEFAULT_ROUNDING - 1) & ~(DEFAULT_ROUNDING - 1))
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+ 4 + DEFAULT_ROUNDING - 1)
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& ~(DEFAULT_ROUNDING - 1));
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size = 4096 - extra;
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}
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h->chunkfun.extra = (struct _obstack_chunk * (*)(void *,long)) chunkfun;
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h->freefun.extra = (void (*) (void *, struct _obstack_chunk *)) freefun;
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h->chunk_size = size;
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h->alignment_mask = alignment - 1;
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h->extra_arg = arg;
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h->use_extra_arg = 1;
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chunk = h->chunk = CALL_CHUNKFUN (h, h -> chunk_size);
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if (!chunk)
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(*obstack_alloc_failed_handler) ();
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h->next_free = h->object_base = __PTR_ALIGN ((char *) chunk, chunk->contents,
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alignment - 1);
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h->chunk_limit = chunk->limit
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= (char *) chunk + h->chunk_size;
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chunk->prev = NULL;
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/* The initial chunk now contains no empty object. */
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h->maybe_empty_object = 0;
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h->alloc_failed = 0;
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return 1;
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}
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/* Allocate a new current chunk for the obstack *H
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on the assumption that LENGTH bytes need to be added
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to the current object, or a new object of length LENGTH allocated.
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Copies any partial object from the end of the old chunk
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to the beginning of the new one. */
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void
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_obstack_newchunk (struct obstack *h, int length)
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{
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register struct _obstack_chunk *old_chunk = h->chunk;
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register struct _obstack_chunk *new_chunk;
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register long new_size;
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register long obj_size = h->next_free - h->object_base;
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register long i;
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long already;
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char *object_base;
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/* Compute size for new chunk. */
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new_size = (obj_size + length) + (obj_size >> 3) + h->alignment_mask + 100;
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if (new_size < h->chunk_size)
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new_size = h->chunk_size;
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/* Allocate and initialize the new chunk. */
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new_chunk = CALL_CHUNKFUN (h, new_size);
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if (!new_chunk)
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(*obstack_alloc_failed_handler) ();
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h->chunk = new_chunk;
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new_chunk->prev = old_chunk;
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new_chunk->limit = h->chunk_limit = (char *) new_chunk + new_size;
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/* Compute an aligned object_base in the new chunk */
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object_base =
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__PTR_ALIGN ((char *) new_chunk, new_chunk->contents, h->alignment_mask);
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/* Move the existing object to the new chunk.
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Word at a time is fast and is safe if the object
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is sufficiently aligned. */
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if (h->alignment_mask + 1 >= DEFAULT_ALIGNMENT)
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{
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for (i = obj_size / sizeof (COPYING_UNIT) - 1;
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i >= 0; i--)
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((COPYING_UNIT *)object_base)[i]
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= ((COPYING_UNIT *)h->object_base)[i];
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/* We used to copy the odd few remaining bytes as one extra COPYING_UNIT,
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but that can cross a page boundary on a machine
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which does not do strict alignment for COPYING_UNITS. */
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already = obj_size / sizeof (COPYING_UNIT) * sizeof (COPYING_UNIT);
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}
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else
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already = 0;
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/* Copy remaining bytes one by one. */
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for (i = already; i < obj_size; i++)
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object_base[i] = h->object_base[i];
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/* If the object just copied was the only data in OLD_CHUNK,
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free that chunk and remove it from the chain.
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But not if that chunk might contain an empty object. */
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if (! h->maybe_empty_object
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&& (h->object_base
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== __PTR_ALIGN ((char *) old_chunk, old_chunk->contents,
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h->alignment_mask)))
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{
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new_chunk->prev = old_chunk->prev;
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CALL_FREEFUN (h, old_chunk);
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}
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h->object_base = object_base;
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h->next_free = h->object_base + obj_size;
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/* The new chunk certainly contains no empty object yet. */
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h->maybe_empty_object = 0;
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}
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# ifdef _LIBC
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libc_hidden_def (_obstack_newchunk)
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# endif
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/* Return nonzero if object OBJ has been allocated from obstack H.
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This is here for debugging.
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If you use it in a program, you are probably losing. */
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/* Suppress -Wmissing-prototypes warning. We don't want to declare this in
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obstack.h because it is just for debugging. */
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int _obstack_allocated_p (struct obstack *h, void *obj);
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int
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_obstack_allocated_p (struct obstack *h, void *obj)
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{
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register struct _obstack_chunk *lp; /* below addr of any objects in this chunk */
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register struct _obstack_chunk *plp; /* point to previous chunk if any */
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lp = (h)->chunk;
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/* We use >= rather than > since the object cannot be exactly at
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the beginning of the chunk but might be an empty object exactly
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at the end of an adjacent chunk. */
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while (lp != NULL && ((void *) lp >= obj || (void *) (lp)->limit < obj))
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{
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plp = lp->prev;
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lp = plp;
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}
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return lp != NULL;
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}
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/* Free objects in obstack H, including OBJ and everything allocate
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more recently than OBJ. If OBJ is zero, free everything in H. */
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# undef obstack_free
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void
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obstack_free (struct obstack *h, void *obj)
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{
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register struct _obstack_chunk *lp; /* below addr of any objects in this chunk */
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register struct _obstack_chunk *plp; /* point to previous chunk if any */
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lp = h->chunk;
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/* We use >= because there cannot be an object at the beginning of a chunk.
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But there can be an empty object at that address
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at the end of another chunk. */
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while (lp != NULL && ((void *) lp >= obj || (void *) (lp)->limit < obj))
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{
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plp = lp->prev;
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CALL_FREEFUN (h, lp);
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lp = plp;
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/* If we switch chunks, we can't tell whether the new current
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chunk contains an empty object, so assume that it may. */
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h->maybe_empty_object = 1;
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}
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if (lp)
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{
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h->object_base = h->next_free = (char *) (obj);
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h->chunk_limit = lp->limit;
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h->chunk = lp;
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}
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else if (obj != NULL)
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/* obj is not in any of the chunks! */
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abort ();
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}
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# ifdef _LIBC
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/* Older versions of libc used a function _obstack_free intended to be
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called by non-GCC compilers. */
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strong_alias (obstack_free, _obstack_free)
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# endif
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int
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_obstack_memory_used (struct obstack *h)
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{
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register struct _obstack_chunk* lp;
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register int nbytes = 0;
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for (lp = h->chunk; lp != NULL; lp = lp->prev)
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{
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nbytes += lp->limit - (char *) lp;
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}
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return nbytes;
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}
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# ifdef _LIBC
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# include <libio/iolibio.h>
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# endif
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# ifndef __attribute__
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/* This feature is available in gcc versions 2.5 and later. */
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# if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 5)
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# define __attribute__(Spec) /* empty */
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# endif
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# endif
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static void
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print_and_abort (void)
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{
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/* Don't change any of these strings. Yes, it would be possible to add
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the newline to the string and use fputs or so. But this must not
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happen because the "memory exhausted" message appears in other places
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like this and the translation should be reused instead of creating
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a very similar string which requires a separate translation. */
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# ifdef _LIBC
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(void) __fxprintf (NULL, "%s\n", _("memory exhausted"));
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# else
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fprintf (stderr, "%s\n", _("memory exhausted"));
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# endif
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exit (1);
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}
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#endif /* !ELIDE_CODE */
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