| /* obstack.c - subroutines used implicitly by object stack macros |
| Copyright (C) 1988-2015 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 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 |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| |
| #ifdef _LIBC |
| # include <obstack.h> |
| #else |
| # include <config.h> |
| # include "obstack.h" |
| #endif |
| |
| /* NOTE BEFORE MODIFYING THIS FILE: _OBSTACK_INTERFACE_VERSION in |
| obstack.h must be incremented whenever callers compiled using an old |
| obstack.h can no longer properly call the functions in this file. */ |
| |
| /* Comment out all this code if we are using the GNU C Library, and are not |
| actually compiling the library itself, and the installed library |
| supports the same library interface we do. This code is part of the GNU |
| C Library, but also included in many other GNU distributions. Compiling |
| and linking in this code is a waste when using the GNU C library |
| (especially if it is a shared library). Rather than having every GNU |
| program understand 'configure --with-gnu-libc' and omit the object |
| files, it is simpler to just do this in the source for each such file. */ |
| #if !defined _LIBC && defined __GNU_LIBRARY__ && __GNU_LIBRARY__ > 1 |
| # include <gnu-versions.h> |
| # if (_GNU_OBSTACK_INTERFACE_VERSION == _OBSTACK_INTERFACE_VERSION \ |
| || (_GNU_OBSTACK_INTERFACE_VERSION == 1 \ |
| && _OBSTACK_INTERFACE_VERSION == 2 \ |
| && defined SIZEOF_INT && defined SIZEOF_SIZE_T \ |
| && SIZEOF_INT == SIZEOF_SIZE_T)) |
| # define _OBSTACK_ELIDE_CODE |
| # endif |
| #endif |
| |
| #ifndef _OBSTACK_ELIDE_CODE |
| /* If GCC, or if an oddball (testing?) host that #defines __alignof__, |
| use the already-supplied __alignof__. Otherwise, this must be Gnulib |
| (as glibc assumes GCC); defer to Gnulib's alignof_type. */ |
| # if !defined __GNUC__ && !defined __IBM__ALIGNOF__ && !defined __alignof__ |
| # if defined __cplusplus |
| template <class type> struct alignof_helper { char __slot1; type __slot2; }; |
| # define __alignof__(type) offsetof (alignof_helper<type>, __slot2) |
| # else |
| # define __alignof__(type) \ |
| offsetof (struct { char __slot1; type __slot2; }, __slot2) |
| # endif |
| # endif |
| # include <stdlib.h> |
| # include <stdint.h> |
| |
| # ifndef MAX |
| # define MAX(a,b) ((a) > (b) ? (a) : (b)) |
| # endif |
| |
| /* Determine default alignment. */ |
| |
| /* If malloc were really smart, it would round addresses to DEFAULT_ALIGNMENT. |
| But in fact it might be less smart and round addresses to as much as |
| DEFAULT_ROUNDING. So we prepare for it to do that. |
| |
| DEFAULT_ALIGNMENT cannot be an enum constant; see gnulib's alignof.h. */ |
| #define DEFAULT_ALIGNMENT MAX (__alignof__ (long double), \ |
| MAX (__alignof__ (uintmax_t), \ |
| __alignof__ (void *))) |
| #define DEFAULT_ROUNDING MAX (sizeof (long double), \ |
| MAX (sizeof (uintmax_t), \ |
| sizeof (void *))) |
| |
| /* Call functions with either the traditional malloc/free calling |
| interface, or the mmalloc/mfree interface (that adds an extra first |
| argument), based on the value of use_extra_arg. */ |
| |
| static void * |
| call_chunkfun (struct obstack *h, size_t size) |
| { |
| if (h->use_extra_arg) |
| return h->chunkfun.extra (h->extra_arg, size); |
| else |
| return h->chunkfun.plain (size); |
| } |
| |
| static void |
| call_freefun (struct obstack *h, void *old_chunk) |
| { |
| if (h->use_extra_arg) |
| h->freefun.extra (h->extra_arg, old_chunk); |
| else |
| h->freefun.plain (old_chunk); |
| } |
| |
| |
| /* Initialize an obstack H for use. Specify chunk size SIZE (0 means default). |
| Objects start on multiples of ALIGNMENT (0 means use default). |
| |
| Return nonzero if successful, calls obstack_alloc_failed_handler if |
| allocation fails. */ |
| |
| static int |
| _obstack_begin_worker (struct obstack *h, |
| _OBSTACK_SIZE_T size, _OBSTACK_SIZE_T alignment) |
| { |
| struct _obstack_chunk *chunk; /* points to new chunk */ |
| |
| if (alignment == 0) |
| alignment = DEFAULT_ALIGNMENT; |
| if (size == 0) |
| /* Default size is what GNU malloc can fit in a 4096-byte block. */ |
| { |
| /* 12 is sizeof (mhead) and 4 is EXTRA from GNU malloc. |
| Use the values for range checking, because if range checking is off, |
| the extra bytes won't be missed terribly, but if range checking is on |
| and we used a larger request, a whole extra 4096 bytes would be |
| allocated. |
| |
| These number are irrelevant to the new GNU malloc. I suspect it is |
| less sensitive to the size of the request. */ |
| int extra = ((((12 + DEFAULT_ROUNDING - 1) & ~(DEFAULT_ROUNDING - 1)) |
| + 4 + DEFAULT_ROUNDING - 1) |
| & ~(DEFAULT_ROUNDING - 1)); |
| size = 4096 - extra; |
| } |
| |
| h->chunk_size = size; |
| h->alignment_mask = alignment - 1; |
| |
| chunk = (struct _obstack_chunk *) call_chunkfun (h, h->chunk_size); |
| if (!chunk) |
| (*obstack_alloc_failed_handler) (); |
| h->chunk = chunk; |
| h->next_free = h->object_base = __PTR_ALIGN ((char *) chunk, chunk->contents, |
| alignment - 1); |
| h->chunk_limit = chunk->limit = (char *) chunk + h->chunk_size; |
| chunk->prev = 0; |
| /* The initial chunk now contains no empty object. */ |
| h->maybe_empty_object = 0; |
| h->alloc_failed = 0; |
| return 1; |
| } |
| |
| int |
| _obstack_begin (struct obstack *h, |
| _OBSTACK_SIZE_T size, _OBSTACK_SIZE_T alignment, |
| void *(*chunkfun) (size_t), |
| void (*freefun) (void *)) |
| { |
| h->chunkfun.plain = chunkfun; |
| h->freefun.plain = freefun; |
| h->use_extra_arg = 0; |
| return _obstack_begin_worker (h, size, alignment); |
| } |
| |
| int |
| _obstack_begin_1 (struct obstack *h, |
| _OBSTACK_SIZE_T size, _OBSTACK_SIZE_T alignment, |
| void *(*chunkfun) (void *, size_t), |
| void (*freefun) (void *, void *), |
| void *arg) |
| { |
| h->chunkfun.extra = chunkfun; |
| h->freefun.extra = freefun; |
| h->extra_arg = arg; |
| h->use_extra_arg = 1; |
| return _obstack_begin_worker (h, size, alignment); |
| } |
| |
| /* Allocate a new current chunk for the obstack *H |
| on the assumption that LENGTH bytes need to be added |
| to the current object, or a new object of length LENGTH allocated. |
| Copies any partial object from the end of the old chunk |
| to the beginning of the new one. */ |
| |
| void |
| _obstack_newchunk (struct obstack *h, _OBSTACK_SIZE_T length) |
| { |
| struct _obstack_chunk *old_chunk = h->chunk; |
| struct _obstack_chunk *new_chunk = 0; |
| size_t obj_size = h->next_free - h->object_base; |
| char *object_base; |
| |
| /* Compute size for new chunk. */ |
| size_t sum1 = obj_size + length; |
| size_t sum2 = sum1 + h->alignment_mask; |
| size_t new_size = sum2 + (obj_size >> 3) + 100; |
| if (new_size < sum2) |
| new_size = sum2; |
| if (new_size < h->chunk_size) |
| new_size = h->chunk_size; |
| |
| /* Allocate and initialize the new chunk. */ |
| if (obj_size <= sum1 && sum1 <= sum2) |
| new_chunk = (struct _obstack_chunk *) call_chunkfun (h, new_size); |
| if (!new_chunk) |
| (*obstack_alloc_failed_handler)(); |
| h->chunk = new_chunk; |
| new_chunk->prev = old_chunk; |
| new_chunk->limit = h->chunk_limit = (char *) new_chunk + new_size; |
| |
| /* Compute an aligned object_base in the new chunk */ |
| object_base = |
| __PTR_ALIGN ((char *) new_chunk, new_chunk->contents, h->alignment_mask); |
| |
| /* Move the existing object to the new chunk. */ |
| memcpy (object_base, h->object_base, obj_size); |
| |
| /* If the object just copied was the only data in OLD_CHUNK, |
| free that chunk and remove it from the chain. |
| But not if that chunk might contain an empty object. */ |
| if (!h->maybe_empty_object |
| && (h->object_base |
| == __PTR_ALIGN ((char *) old_chunk, old_chunk->contents, |
| h->alignment_mask))) |
| { |
| new_chunk->prev = old_chunk->prev; |
| call_freefun (h, old_chunk); |
| } |
| |
| h->object_base = object_base; |
| h->next_free = h->object_base + obj_size; |
| /* The new chunk certainly contains no empty object yet. */ |
| h->maybe_empty_object = 0; |
| } |
| |
| /* Return nonzero if object OBJ has been allocated from obstack H. |
| This is here for debugging. |
| If you use it in a program, you are probably losing. */ |
| |
| /* Suppress -Wmissing-prototypes warning. We don't want to declare this in |
| obstack.h because it is just for debugging. */ |
| int _obstack_allocated_p (struct obstack *h, void *obj) __attribute_pure__; |
| |
| int |
| _obstack_allocated_p (struct obstack *h, void *obj) |
| { |
| struct _obstack_chunk *lp; /* below addr of any objects in this chunk */ |
| struct _obstack_chunk *plp; /* point to previous chunk if any */ |
| |
| lp = (h)->chunk; |
| /* We use >= rather than > since the object cannot be exactly at |
| the beginning of the chunk but might be an empty object exactly |
| at the end of an adjacent chunk. */ |
| while (lp != 0 && ((void *) lp >= obj || (void *) (lp)->limit < obj)) |
| { |
| plp = lp->prev; |
| lp = plp; |
| } |
| return lp != 0; |
| } |
| |
| /* Free objects in obstack H, including OBJ and everything allocate |
| more recently than OBJ. If OBJ is zero, free everything in H. */ |
| |
| void |
| _obstack_free (struct obstack *h, void *obj) |
| { |
| struct _obstack_chunk *lp; /* below addr of any objects in this chunk */ |
| struct _obstack_chunk *plp; /* point to previous chunk if any */ |
| |
| lp = h->chunk; |
| /* We use >= because there cannot be an object at the beginning of a chunk. |
| But there can be an empty object at that address |
| at the end of another chunk. */ |
| while (lp != 0 && ((void *) lp >= obj || (void *) (lp)->limit < obj)) |
| { |
| plp = lp->prev; |
| call_freefun (h, lp); |
| lp = plp; |
| /* If we switch chunks, we can't tell whether the new current |
| chunk contains an empty object, so assume that it may. */ |
| h->maybe_empty_object = 1; |
| } |
| if (lp) |
| { |
| h->object_base = h->next_free = (char *) (obj); |
| h->chunk_limit = lp->limit; |
| h->chunk = lp; |
| } |
| else if (obj != 0) |
| /* obj is not in any of the chunks! */ |
| abort (); |
| } |
| |
| _OBSTACK_SIZE_T |
| _obstack_memory_used (struct obstack *h) |
| { |
| struct _obstack_chunk *lp; |
| _OBSTACK_SIZE_T nbytes = 0; |
| |
| for (lp = h->chunk; lp != 0; lp = lp->prev) |
| { |
| nbytes += lp->limit - (char *) lp; |
| } |
| return nbytes; |
| } |
| |
| # ifndef _OBSTACK_NO_ERROR_HANDLER |
| /* Define the error handler. */ |
| # include <stdio.h> |
| |
| /* Exit value used when 'print_and_abort' is used. */ |
| # ifdef _LIBC |
| int obstack_exit_failure = EXIT_FAILURE; |
| # else |
| # ifndef EXIT_FAILURE |
| # define EXIT_FAILURE 1 |
| # endif |
| # define obstack_exit_failure EXIT_FAILURE |
| # endif |
| |
| # if defined _LIBC || (HAVE_LIBINTL_H && ENABLE_NLS) |
| # include <libintl.h> |
| # ifndef _ |
| # define _(msgid) gettext (msgid) |
| # endif |
| # else |
| # ifndef _ |
| # define _(msgid) (msgid) |
| # endif |
| # endif |
| |
| # if !(defined _Noreturn \ |
| || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 201112)) |
| # if ((defined __GNUC__ \ |
| && (__GNUC__ >= 3 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 8))) \ |
| || (defined __SUNPRO_C && __SUNPRO_C >= 0x5110)) |
| # define _Noreturn __attribute__ ((__noreturn__)) |
| # elif defined _MSC_VER && _MSC_VER >= 1200 |
| # define _Noreturn __declspec (noreturn) |
| # else |
| # define _Noreturn |
| # endif |
| # endif |
| |
| # ifdef _LIBC |
| # include <libio/iolibio.h> |
| # endif |
| |
| static _Noreturn void |
| print_and_abort (void) |
| { |
| /* Don't change any of these strings. Yes, it would be possible to add |
| the newline to the string and use fputs or so. But this must not |
| happen because the "memory exhausted" message appears in other places |
| like this and the translation should be reused instead of creating |
| a very similar string which requires a separate translation. */ |
| # ifdef _LIBC |
| (void) __fxprintf (NULL, "%s\n", _("memory exhausted")); |
| # else |
| fprintf (stderr, "%s\n", _("memory exhausted")); |
| # endif |
| exit (obstack_exit_failure); |
| } |
| |
| /* The functions allocating more room by calling 'obstack_chunk_alloc' |
| jump to the handler pointed to by 'obstack_alloc_failed_handler'. |
| This can be set to a user defined function which should either |
| abort gracefully or use longjump - but shouldn't return. This |
| variable by default points to the internal function |
| 'print_and_abort'. */ |
| void (*obstack_alloc_failed_handler) (void) = print_and_abort; |
| # endif /* !_OBSTACK_NO_ERROR_HANDLER */ |
| #endif /* !_OBSTACK_ELIDE_CODE */ |