795 lines
29 KiB
C++
795 lines
29 KiB
C++
/* obstack.h - object stack macros
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Copyright (C) 1988-1994,1996-1999,2003,2004,2005,2009,2011,2012
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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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/* Summary:
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All the apparent functions defined here are macros. The idea
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is that you would use these pre-tested macros to solve a
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very specific set of problems, and they would run fast.
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Caution: no side-effects in arguments please!! They may be
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evaluated MANY times!!
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These macros operate a stack of objects. Each object starts life
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small, and may grow to maturity. (Consider building a word syllable
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by syllable.) An object can move while it is growing. Once it has
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been "finished" it never changes address again. So the "top of the
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stack" is typically an immature growing object, while the rest of the
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stack is of mature, fixed size and fixed address objects.
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These routines grab large chunks of memory, using a function you
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supply, called `obstack_chunk_alloc'. On occasion, they free chunks,
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by calling `obstack_chunk_free'. You must define them and declare
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them before using any obstack macros.
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Each independent stack is represented by a `struct obstack'.
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Each of the obstack macros expects a pointer to such a structure
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as the first argument.
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One motivation for this package is the problem of growing char strings
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in symbol tables. Unless you are "fascist pig with a read-only mind"
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--Gosper's immortal quote from HAKMEM item 154, out of context--you
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would not like to put any arbitrary upper limit on the length of your
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symbols.
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In practice this often means you will build many short symbols and a
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few long symbols. At the time you are reading a symbol you don't know
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how long it is. One traditional method is to read a symbol into a
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buffer, realloc()ating the buffer every time you try to read a symbol
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that is longer than the buffer. This is beaut, but you still will
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want to copy the symbol from the buffer to a more permanent
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symbol-table entry say about half the time.
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With obstacks, you can work differently. Use one obstack for all symbol
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names. As you read a symbol, grow the name in the obstack gradually.
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When the name is complete, finalize it. Then, if the symbol exists already,
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free the newly read name.
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The way we do this is to take a large chunk, allocating memory from
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low addresses. When you want to build a symbol in the chunk you just
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add chars above the current "high water mark" in the chunk. When you
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have finished adding chars, because you got to the end of the symbol,
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you know how long the chars are, and you can create a new object.
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Mostly the chars will not burst over the highest address of the chunk,
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because you would typically expect a chunk to be (say) 100 times as
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long as an average object.
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In case that isn't clear, when we have enough chars to make up
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the object, THEY ARE ALREADY CONTIGUOUS IN THE CHUNK (guaranteed)
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so we just point to it where it lies. No moving of chars is
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needed and this is the second win: potentially long strings need
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never be explicitly shuffled. Once an object is formed, it does not
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change its address during its lifetime.
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When the chars burst over a chunk boundary, we allocate a larger
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chunk, and then copy the partly formed object from the end of the old
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chunk to the beginning of the new larger chunk. We then carry on
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accreting characters to the end of the object as we normally would.
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A special macro is provided to add a single char at a time to a
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growing object. This allows the use of register variables, which
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break the ordinary 'growth' macro.
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Summary:
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We allocate large chunks.
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We carve out one object at a time from the current chunk.
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Once carved, an object never moves.
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We are free to append data of any size to the currently
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growing object.
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Exactly one object is growing in an obstack at any one time.
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You can run one obstack per control block.
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You may have as many control blocks as you dare.
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Because of the way we do it, you can `unwind' an obstack
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back to a previous state. (You may remove objects much
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as you would with a stack.)
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*/
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/* Don't do the contents of this file more than once. */
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#ifndef _OBSTACK_H
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#define _OBSTACK_H 1
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* We need the type of a pointer subtraction. If __PTRDIFF_TYPE__ is
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defined, as with GNU C, use that; that way we don't pollute the
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namespace with <stddef.h>'s symbols. Otherwise, include <stddef.h>
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and use ptrdiff_t. */
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#ifdef __PTRDIFF_TYPE__
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# define PTR_INT_TYPE __PTRDIFF_TYPE__
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#else
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# include <stddef.h>
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# define PTR_INT_TYPE ptrdiff_t
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#endif
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/* If B is the base of an object addressed by P, return the result of
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aligning P to the next multiple of A + 1. B and P must be of type
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char *. A + 1 must be a power of 2. */
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#define __BPTR_ALIGN(B, P, A) ((B) + (((P) - (B) + (A)) & ~(A)))
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/* Similiar to _BPTR_ALIGN (B, P, A), except optimize the common case
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where pointers can be converted to integers, aligned as integers,
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and converted back again. If PTR_INT_TYPE is narrower than a
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pointer (e.g., the AS/400), play it safe and compute the alignment
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relative to B. Otherwise, use the faster strategy of computing the
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alignment relative to 0. */
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#define __PTR_ALIGN(B, P, A) \
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__BPTR_ALIGN (sizeof (PTR_INT_TYPE) < sizeof (void *) ? (B) : (char *) 0, \
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P, A)
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#include <string.h>
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struct _obstack_chunk /* Lives at front of each chunk. */
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{
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char *limit; /* 1 past end of this chunk */
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struct _obstack_chunk *prev; /* address of prior chunk or NULL */
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char contents[4]; /* objects begin here */
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};
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struct obstack /* control current object in current chunk */
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{
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long chunk_size; /* preferred size to allocate chunks in */
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struct _obstack_chunk *chunk; /* address of current struct obstack_chunk */
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char *object_base; /* address of object we are building */
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char *next_free; /* where to add next char to current object */
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char *chunk_limit; /* address of char after current chunk */
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union
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{
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PTR_INT_TYPE tempint;
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void *tempptr;
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} temp; /* Temporary for some macros. */
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int alignment_mask; /* Mask of alignment for each object. */
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/* These prototypes vary based on `use_extra_arg', and we use
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casts to the prototypeless function type in all assignments,
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but having prototypes here quiets -Wstrict-prototypes. */
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struct _obstack_chunk *(*chunkfun) (void *, long);
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void (*freefun) (void *, struct _obstack_chunk *);
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void *extra_arg; /* first arg for chunk alloc/dealloc funcs */
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unsigned use_extra_arg:1; /* chunk alloc/dealloc funcs take extra arg */
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unsigned maybe_empty_object:1;/* There is a possibility that the current
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chunk contains a zero-length object. This
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prevents freeing the chunk if we allocate
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a bigger chunk to replace it. */
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unsigned alloc_failed:1; /* No longer used, as we now call the failed
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handler on error, but retained for binary
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compatibility. */
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};
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static void _obstack_newchunk (struct obstack *h, int length);
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/* Exit value used when `print_and_abort' is used. */
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extern int obstack_exit_failure;
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/* Pointer to beginning of object being allocated or to be allocated next.
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Note that this might not be the final address of the object
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because a new chunk might be needed to hold the final size. */
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#define obstack_base(h) ((void *) (h)->object_base)
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/* Size for allocating ordinary chunks. */
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#define obstack_chunk_size(h) ((h)->chunk_size)
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/* Pointer to next byte not yet allocated in current chunk. */
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#define obstack_next_free(h) ((h)->next_free)
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/* Mask specifying low bits that should be clear in address of an object. */
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#define obstack_alignment_mask(h) ((h)->alignment_mask)
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/* To prevent prototype warnings provide complete argument list. */
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#define obstack_init(h) \
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_obstack_begin ((h), 0, 0, \
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(void *(*) (long)) obstack_chunk_alloc, \
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(void (*) (void *)) obstack_chunk_free)
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#define obstack_begin(h, size) \
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_obstack_begin ((h), (size), 0, \
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(void *(*) (long)) obstack_chunk_alloc, \
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(void (*) (void *)) obstack_chunk_free)
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#define obstack_specify_allocation(h, size, alignment, chunkfun, freefun) \
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_obstack_begin ((h), (size), (alignment), \
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(void *(*) (long)) (chunkfun), \
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(void (*) (void *)) (freefun))
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#define obstack_specify_allocation_with_arg(h, size, alignment, chunkfun, freefun, arg) \
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_obstack_begin_1 ((h), (size), (alignment), \
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(void *(*) (void *, long)) (chunkfun), \
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(void (*) (void *, void *)) (freefun), (arg))
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#define obstack_chunkfun(h, newchunkfun) \
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((h) -> chunkfun = (struct _obstack_chunk *(*)(void *, long)) (newchunkfun))
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#define obstack_freefun(h, newfreefun) \
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((h) -> freefun = (void (*)(void *, struct _obstack_chunk *)) (newfreefun))
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#define obstack_1grow_fast(h,achar) (*((h)->next_free)++ = (achar))
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#define obstack_blank_fast(h,n) ((h)->next_free += (n))
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#define obstack_memory_used(h) _obstack_memory_used (h)
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#if defined __GNUC__
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/* NextStep 2.0 cc is really gcc 1.93 but it defines __GNUC__ = 2 and
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does not implement __extension__. But that compiler doesn't define
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__GNUC_MINOR__. */
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# if __GNUC__ < 2 || (__NeXT__ && !__GNUC_MINOR__)
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# define __extension__
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# endif
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/* For GNU C, if not -traditional,
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we can define these macros to compute all args only once
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without using a global variable.
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Also, we can avoid using the `temp' slot, to make faster code. */
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# define obstack_object_size(OBSTACK) \
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__extension__ \
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({ struct obstack const *__o = (OBSTACK); \
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(unsigned) (__o->next_free - __o->object_base); })
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# define obstack_room(OBSTACK) \
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__extension__ \
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({ struct obstack const *__o = (OBSTACK); \
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(unsigned) (__o->chunk_limit - __o->next_free); })
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# define obstack_make_room(OBSTACK,length) \
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__extension__ \
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({ struct obstack *__o = (OBSTACK); \
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int __len = (length); \
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if (__o->chunk_limit - __o->next_free < __len) \
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_obstack_newchunk (__o, __len); \
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(void) 0; })
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# define obstack_empty_p(OBSTACK) \
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__extension__ \
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({ struct obstack const *__o = (OBSTACK); \
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(__o->chunk->prev == 0 \
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&& __o->next_free == __PTR_ALIGN ((char *) __o->chunk, \
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__o->chunk->contents, \
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__o->alignment_mask)); })
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# define obstack_grow(OBSTACK,where,length) \
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__extension__ \
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({ struct obstack *__o = (OBSTACK); \
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int __len = (length); \
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if (__o->next_free + __len > __o->chunk_limit) \
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_obstack_newchunk (__o, __len); \
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memcpy (__o->next_free, where, __len); \
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__o->next_free += __len; \
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(void) 0; })
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# define obstack_grow0(OBSTACK,where,length) \
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__extension__ \
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({ struct obstack *__o = (OBSTACK); \
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int __len = (length); \
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if (__o->next_free + __len + 1 > __o->chunk_limit) \
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_obstack_newchunk (__o, __len + 1); \
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memcpy (__o->next_free, where, __len); \
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__o->next_free += __len; \
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*(__o->next_free)++ = 0; \
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(void) 0; })
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# define obstack_1grow(OBSTACK,datum) \
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__extension__ \
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({ struct obstack *__o = (OBSTACK); \
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if (__o->next_free + 1 > __o->chunk_limit) \
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_obstack_newchunk (__o, 1); \
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obstack_1grow_fast (__o, datum); \
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(void) 0; })
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/* These assume that the obstack alignment is good enough for pointers
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or ints, and that the data added so far to the current object
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shares that much alignment. */
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# define obstack_ptr_grow(OBSTACK,datum) \
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__extension__ \
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({ struct obstack *__o = (OBSTACK); \
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if (__o->next_free + sizeof (void *) > __o->chunk_limit) \
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_obstack_newchunk (__o, sizeof (void *)); \
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obstack_ptr_grow_fast (__o, datum); }) \
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# define obstack_int_grow(OBSTACK,datum) \
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__extension__ \
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({ struct obstack *__o = (OBSTACK); \
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if (__o->next_free + sizeof (int) > __o->chunk_limit) \
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_obstack_newchunk (__o, sizeof (int)); \
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obstack_int_grow_fast (__o, datum); })
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# define obstack_ptr_grow_fast(OBSTACK,aptr) \
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__extension__ \
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({ struct obstack *__o1 = (OBSTACK); \
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*(const void **) __o1->next_free = (aptr); \
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__o1->next_free += sizeof (const void *); \
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(void) 0; })
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# define obstack_int_grow_fast(OBSTACK,aint) \
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__extension__ \
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({ struct obstack *__o1 = (OBSTACK); \
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*(int *) __o1->next_free = (aint); \
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__o1->next_free += sizeof (int); \
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(void) 0; })
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# define obstack_blank(OBSTACK,length) \
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__extension__ \
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({ struct obstack *__o = (OBSTACK); \
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int __len = (length); \
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if (__o->chunk_limit - __o->next_free < __len) \
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_obstack_newchunk (__o, __len); \
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obstack_blank_fast (__o, __len); \
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(void) 0; })
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# define obstack_alloc(OBSTACK,length) \
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__extension__ \
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({ struct obstack *__h = (OBSTACK); \
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obstack_blank (__h, (length)); \
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obstack_finish (__h); })
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# define obstack_copy(OBSTACK,where,length) \
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__extension__ \
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({ struct obstack *__h = (OBSTACK); \
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obstack_grow (__h, (where), (length)); \
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obstack_finish (__h); })
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# define obstack_copy0(OBSTACK,where,length) \
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__extension__ \
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({ struct obstack *__h = (OBSTACK); \
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obstack_grow0 (__h, (where), (length)); \
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obstack_finish (__h); })
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/* The local variable is named __o1 to avoid a name conflict
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when obstack_blank is called. */
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# define obstack_finish(OBSTACK) \
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__extension__ \
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({ struct obstack *__o1 = (OBSTACK); \
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void *__value = (void *) __o1->object_base; \
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if (__o1->next_free == __value) \
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__o1->maybe_empty_object = 1; \
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__o1->next_free \
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= __PTR_ALIGN (__o1->object_base, __o1->next_free, \
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__o1->alignment_mask); \
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if (__o1->next_free - (char *)__o1->chunk \
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> __o1->chunk_limit - (char *)__o1->chunk) \
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__o1->next_free = __o1->chunk_limit; \
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__o1->object_base = __o1->next_free; \
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__value; })
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# define obstack_free(OBSTACK, OBJ) \
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__extension__ \
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({ struct obstack *__o = (OBSTACK); \
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void *__obj = (OBJ); \
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if (__obj > (void *)__o->chunk && __obj < (void *)__o->chunk_limit) \
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__o->next_free = __o->object_base = (char *)__obj; \
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else (obstack_free_func) (__o, __obj); })
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||
#else /* not __GNUC__ */
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# define obstack_object_size(h) \
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(unsigned) ((h)->next_free - (h)->object_base)
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||
|
||
# define obstack_room(h) \
|
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(unsigned) ((h)->chunk_limit - (h)->next_free)
|
||
|
||
# define obstack_empty_p(h) \
|
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((h)->chunk->prev == 0 \
|
||
&& (h)->next_free == __PTR_ALIGN ((char *) (h)->chunk, \
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||
(h)->chunk->contents, \
|
||
(h)->alignment_mask))
|
||
|
||
/* Note that the call to _obstack_newchunk is enclosed in (..., 0)
|
||
so that we can avoid having void expressions
|
||
in the arms of the conditional expression.
|
||
Casting the third operand to void was tried before,
|
||
but some compilers won't accept it. */
|
||
|
||
# define obstack_make_room(h,length) \
|
||
( (h)->temp.tempint = (length), \
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(((h)->next_free + (h)->temp.tempint > (h)->chunk_limit) \
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||
? (_obstack_newchunk ((h), (h)->temp.tempint), 0) : 0))
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||
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||
# define obstack_grow(h,where,length) \
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||
( (h)->temp.tempint = (length), \
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||
(((h)->next_free + (h)->temp.tempint > (h)->chunk_limit) \
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||
? (_obstack_newchunk ((h), (h)->temp.tempint), 0) : 0), \
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memcpy ((h)->next_free, where, (h)->temp.tempint), \
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(h)->next_free += (h)->temp.tempint)
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||
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||
# define obstack_grow0(h,where,length) \
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||
( (h)->temp.tempint = (length), \
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(((h)->next_free + (h)->temp.tempint + 1 > (h)->chunk_limit) \
|
||
? (_obstack_newchunk ((h), (h)->temp.tempint + 1), 0) : 0), \
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||
memcpy ((h)->next_free, where, (h)->temp.tempint), \
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(h)->next_free += (h)->temp.tempint, \
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*((h)->next_free)++ = 0)
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||
|
||
# define obstack_1grow(h,datum) \
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||
( (((h)->next_free + 1 > (h)->chunk_limit) \
|
||
? (_obstack_newchunk ((h), 1), 0) : 0), \
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obstack_1grow_fast (h, datum))
|
||
|
||
# define obstack_ptr_grow(h,datum) \
|
||
( (((h)->next_free + sizeof (char *) > (h)->chunk_limit) \
|
||
? (_obstack_newchunk ((h), sizeof (char *)), 0) : 0), \
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||
obstack_ptr_grow_fast (h, datum))
|
||
|
||
# define obstack_int_grow(h,datum) \
|
||
( (((h)->next_free + sizeof (int) > (h)->chunk_limit) \
|
||
? (_obstack_newchunk ((h), sizeof (int)), 0) : 0), \
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||
obstack_int_grow_fast (h, datum))
|
||
|
||
# define obstack_ptr_grow_fast(h,aptr) \
|
||
(((const void **) ((h)->next_free += sizeof (void *)))[-1] = (aptr))
|
||
|
||
# define obstack_int_grow_fast(h,aint) \
|
||
(((int *) ((h)->next_free += sizeof (int)))[-1] = (aint))
|
||
|
||
# define obstack_blank(h,length) \
|
||
( (h)->temp.tempint = (length), \
|
||
(((h)->chunk_limit - (h)->next_free < (h)->temp.tempint) \
|
||
? (_obstack_newchunk ((h), (h)->temp.tempint), 0) : 0), \
|
||
obstack_blank_fast (h, (h)->temp.tempint))
|
||
|
||
# define obstack_alloc(h,length) \
|
||
(obstack_blank ((h), (length)), obstack_finish ((h)))
|
||
|
||
# define obstack_copy(h,where,length) \
|
||
(obstack_grow ((h), (where), (length)), obstack_finish ((h)))
|
||
|
||
# define obstack_copy0(h,where,length) \
|
||
(obstack_grow0 ((h), (where), (length)), obstack_finish ((h)))
|
||
|
||
# define obstack_finish(h) \
|
||
( ((h)->next_free == (h)->object_base \
|
||
? (((h)->maybe_empty_object = 1), 0) \
|
||
: 0), \
|
||
(h)->temp.tempptr = (h)->object_base, \
|
||
(h)->next_free \
|
||
= __PTR_ALIGN ((h)->object_base, (h)->next_free, \
|
||
(h)->alignment_mask), \
|
||
(((h)->next_free - (char *) (h)->chunk \
|
||
> (h)->chunk_limit - (char *) (h)->chunk) \
|
||
? ((h)->next_free = (h)->chunk_limit) : 0), \
|
||
(h)->object_base = (h)->next_free, \
|
||
(h)->temp.tempptr)
|
||
|
||
# define obstack_free(h,obj) \
|
||
( (h)->temp.tempint = (char *) (obj) - (char *) (h)->chunk, \
|
||
((((h)->temp.tempint > 0 \
|
||
&& (h)->temp.tempint < (h)->chunk_limit - (char *) (h)->chunk)) \
|
||
? (((h)->next_free = (h)->object_base \
|
||
= (h)->temp.tempint + (char *) (h)->chunk), 0) \
|
||
: ((obstack_free_func) ((h), (h)->temp.tempint + (char *) (h)->chunk), 0)))
|
||
|
||
#endif /* not __GNUC__ */
|
||
|
||
/* START LOCAL ADDITION */
|
||
static inline int obstack_printf(struct obstack *obst, const char *fmt, ...)
|
||
{
|
||
char buf[1024];
|
||
va_list ap;
|
||
int len;
|
||
|
||
va_start(ap, fmt);
|
||
len = vsnprintf(buf, sizeof(buf), fmt, ap);
|
||
obstack_grow(obst, buf, len);
|
||
va_end(ap);
|
||
|
||
return len;
|
||
}
|
||
/* Determine default alignment. */
|
||
union fooround
|
||
{
|
||
uintmax_t i;
|
||
long double d;
|
||
void *p;
|
||
};
|
||
struct fooalign
|
||
{
|
||
char c;
|
||
union fooround u;
|
||
};
|
||
/* 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. */
|
||
enum
|
||
{
|
||
DEFAULT_ALIGNMENT = offsetof (struct fooalign, u),
|
||
DEFAULT_ROUNDING = sizeof (union fooround)
|
||
};
|
||
|
||
/* When we copy a long block of data, this is the unit to do it with.
|
||
On some machines, copying successive ints does not work;
|
||
in such a case, redefine COPYING_UNIT to `long' (if that works)
|
||
or `char' as a last resort. */
|
||
# ifndef COPYING_UNIT
|
||
# define COPYING_UNIT int
|
||
# endif
|
||
|
||
|
||
/* 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'. */
|
||
static void print_and_abort (void);
|
||
|
||
# ifdef _LIBC
|
||
# if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_3_4)
|
||
/* A looong time ago (before 1994, anyway; we're not sure) this global variable
|
||
was used by non-GNU-C macros to avoid multiple evaluation. The GNU C
|
||
library still exports it because somebody might use it. */
|
||
struct obstack *_obstack_compat;
|
||
compat_symbol (libc, _obstack_compat, _obstack, GLIBC_2_0);
|
||
# endif
|
||
# endif
|
||
|
||
/* Define a macro that either calls functions with the traditional malloc/free
|
||
calling interface, or calls functions with the mmalloc/mfree interface
|
||
(that adds an extra first argument), based on the state of use_extra_arg.
|
||
For free, do not use ?:, since some compilers, like the MIPS compilers,
|
||
do not allow (expr) ? void : void. */
|
||
|
||
# define CALL_CHUNKFUN(h, size) \
|
||
(((h) -> use_extra_arg) \
|
||
? (*(h)->chunkfun) ((h)->extra_arg, (size)) \
|
||
: (*(struct _obstack_chunk *(*) (long)) (h)->chunkfun) ((size)))
|
||
|
||
# define CALL_FREEFUN(h, old_chunk) \
|
||
do { \
|
||
if ((h) -> use_extra_arg) \
|
||
(*(h)->freefun) ((h)->extra_arg, (old_chunk)); \
|
||
else \
|
||
(*(void (*) (void *)) (h)->freefun) ((old_chunk)); \
|
||
} while (0)
|
||
|
||
|
||
/* Initialize an obstack H for use. Specify chunk size SIZE (0 means default).
|
||
Objects start on multiples of ALIGNMENT (0 means use default).
|
||
CHUNKFUN is the function to use to allocate chunks,
|
||
and FREEFUN the function to free them.
|
||
Return nonzero if successful, calls obstack_alloc_failed_handler if
|
||
allocation fails. */
|
||
|
||
static int _obstack_begin (struct obstack *h,
|
||
int size, int alignment,
|
||
void *(*chunkfun) (long),
|
||
void (*freefun) (void *))
|
||
{
|
||
register 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->chunkfun = (struct _obstack_chunk * (*)(void *, long)) chunkfun;
|
||
h->freefun = (void (*) (void *, struct _obstack_chunk *)) freefun;
|
||
h->chunk_size = size;
|
||
h->alignment_mask = alignment - 1;
|
||
h->use_extra_arg = 0;
|
||
|
||
chunk = h->chunk = CALL_CHUNKFUN (h, h -> chunk_size);
|
||
if (!chunk) print_and_abort();
|
||
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;
|
||
}
|
||
|
||
static int _obstack_begin_1 (struct obstack *h, int size, int alignment,
|
||
void *(*chunkfun) (void *, long),
|
||
void (*freefun) (void *, void *),
|
||
void *arg)
|
||
{
|
||
register 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->chunkfun = (struct _obstack_chunk * (*)(void *,long)) chunkfun;
|
||
h->freefun = (void (*) (void *, struct _obstack_chunk *)) freefun;
|
||
h->chunk_size = size;
|
||
h->alignment_mask = alignment - 1;
|
||
h->extra_arg = arg;
|
||
h->use_extra_arg = 1;
|
||
|
||
chunk = h->chunk = CALL_CHUNKFUN (h, h -> chunk_size);
|
||
if (!chunk) print_and_abort();
|
||
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;
|
||
}
|
||
|
||
/* 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. */
|
||
|
||
static void _obstack_newchunk (struct obstack *h, int length)
|
||
{
|
||
register struct _obstack_chunk *old_chunk = h->chunk;
|
||
register struct _obstack_chunk *new_chunk;
|
||
register long new_size;
|
||
register long obj_size = h->next_free - h->object_base;
|
||
register long i;
|
||
long already;
|
||
char *object_base;
|
||
|
||
/* Compute size for new chunk. */
|
||
new_size = (obj_size + length) + (obj_size >> 3) + h->alignment_mask + 100;
|
||
if (new_size < h->chunk_size)
|
||
new_size = h->chunk_size;
|
||
|
||
/* Allocate and initialize the new chunk. */
|
||
new_chunk = CALL_CHUNKFUN (h, new_size);
|
||
if (!new_chunk) print_and_abort();
|
||
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.
|
||
Word at a time is fast and is safe if the object
|
||
is sufficiently aligned. */
|
||
if (h->alignment_mask + 1 >= DEFAULT_ALIGNMENT)
|
||
{
|
||
for (i = obj_size / sizeof (COPYING_UNIT) - 1;
|
||
i >= 0; i--)
|
||
((COPYING_UNIT *)object_base)[i]
|
||
= ((COPYING_UNIT *)h->object_base)[i];
|
||
/* We used to copy the odd few remaining bytes as one extra COPYING_UNIT,
|
||
but that can cross a page boundary on a machine
|
||
which does not do strict alignment for COPYING_UNITS. */
|
||
already = obj_size / sizeof (COPYING_UNIT) * sizeof (COPYING_UNIT);
|
||
}
|
||
else
|
||
already = 0;
|
||
/* Copy remaining bytes one by one. */
|
||
for (i = already; i < obj_size; i++)
|
||
object_base[i] = h->object_base[i];
|
||
|
||
/* 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. */
|
||
|
||
/* Free objects in obstack H, including OBJ and everything allocate
|
||
more recently than OBJ. If OBJ is zero, free everything in H. */
|
||
static void obstack_free_func (struct obstack *h, void *obj)
|
||
{
|
||
register struct _obstack_chunk *lp; /* below addr of any objects in this chunk */
|
||
register 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 ();
|
||
}
|
||
|
||
static int _obstack_memory_used (struct obstack *h)
|
||
{
|
||
register struct _obstack_chunk* lp;
|
||
register int nbytes = 0;
|
||
|
||
for (lp = h->chunk; lp != 0; lp = lp->prev)
|
||
{
|
||
nbytes += lp->limit - (char *) lp;
|
||
}
|
||
return nbytes;
|
||
}
|
||
|
||
static void __attribute__ ((noreturn)) print_and_abort (void)
|
||
{
|
||
fprintf(stderr, "%s\n", "memory exhausted");
|
||
exit(1);
|
||
}
|
||
|
||
/* END LOCAL ADDITION */
|
||
|
||
#ifdef __cplusplus
|
||
} /* C++ */
|
||
#endif
|
||
|
||
#endif /* obstack.h */
|