mirror of
https://github.com/darlinghq/darling-gdb.git
synced 2024-12-05 19:07:07 +00:00
334 lines
9.3 KiB
C
Executable File
334 lines
9.3 KiB
C
Executable File
/* obstack.c - subroutines used implicitly by object stack macros
|
||
Copyright (C) 1988 Free Software Foundation, Inc.
|
||
|
||
This program is free software; you can redistribute it and/or modify it
|
||
under the terms of the GNU General Public License as published by the
|
||
Free Software Foundation; either version 1, or (at your option) any
|
||
later version.
|
||
|
||
This program is distributed in the hope that it will be useful,
|
||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
GNU General Public License for more details.
|
||
|
||
You should have received a copy of the GNU General Public License
|
||
along with this program; if not, write to the Free Software
|
||
Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
|
||
|
||
#include "obstack.h"
|
||
|
||
#ifdef __STDC__
|
||
#define POINTER void *
|
||
#else
|
||
#define POINTER char *
|
||
#endif
|
||
|
||
/* Determine default alignment. */
|
||
struct fooalign {char x; double d;};
|
||
#define DEFAULT_ALIGNMENT ((char *)&((struct fooalign *) 0)->d - (char *)0)
|
||
/* 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. */
|
||
union fooround {long x; double d;};
|
||
#define 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 non-GNU-C macros copy the obstack into this global variable
|
||
to avoid multiple evaluation. */
|
||
|
||
struct obstack *_obstack;
|
||
|
||
/* 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. */
|
||
|
||
void
|
||
_obstack_begin (h, size, alignment, chunkfun, freefun)
|
||
struct obstack *h;
|
||
int size;
|
||
int alignment;
|
||
POINTER (*chunkfun) ();
|
||
void (*freefun) ();
|
||
{
|
||
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 = chunkfun;
|
||
h->freefun = freefun;
|
||
h->chunk_size = size;
|
||
h->alignment_mask = alignment - 1;
|
||
|
||
chunk = h->chunk = (struct _obstack_chunk *)(*h->chunkfun) (h->chunk_size);
|
||
h->next_free = h->object_base = chunk->contents;
|
||
h->chunk_limit = chunk->limit
|
||
= (char *) chunk + h->chunk_size;
|
||
chunk->prev = 0;
|
||
}
|
||
|
||
/* 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.
|
||
|
||
The function must be "int" so it can be used in non-ANSI C
|
||
compilers in a : expression. */
|
||
|
||
int
|
||
_obstack_newchunk (h, length)
|
||
struct obstack *h;
|
||
int length;
|
||
{
|
||
register struct _obstack_chunk* old_chunk = h->chunk;
|
||
register struct _obstack_chunk* new_chunk;
|
||
register long new_size;
|
||
register int obj_size = h->next_free - h->object_base;
|
||
register int i;
|
||
int already;
|
||
|
||
/* Compute size for new chunk. */
|
||
new_size = (obj_size + length) + (obj_size >> 3) + 100;
|
||
if (new_size < h->chunk_size)
|
||
new_size = h->chunk_size;
|
||
|
||
/* Allocate and initialize the new chunk. */
|
||
new_chunk = h->chunk = (struct _obstack_chunk *)(*h->chunkfun) (new_size);
|
||
new_chunk->prev = old_chunk;
|
||
new_chunk->limit = h->chunk_limit = (char *) new_chunk + new_size;
|
||
|
||
/* 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 *)new_chunk->contents)[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++)
|
||
new_chunk->contents[i] = h->object_base[i];
|
||
|
||
h->object_base = new_chunk->contents;
|
||
h->next_free = h->object_base + obj_size;
|
||
}
|
||
|
||
/* 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. */
|
||
|
||
int
|
||
_obstack_allocated_p (h, obj)
|
||
struct obstack *h;
|
||
POINTER 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;
|
||
while (lp != 0 && ((POINTER)lp > obj || (POINTER)(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. */
|
||
|
||
#ifdef __STDC__
|
||
#undef obstack_free
|
||
void
|
||
obstack_free (struct obstack *h, POINTER obj)
|
||
#else
|
||
int
|
||
_obstack_free (h, obj)
|
||
struct obstack *h;
|
||
POINTER obj;
|
||
#endif
|
||
{
|
||
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 && ((POINTER)lp >= obj || (POINTER)(lp)->limit < obj))
|
||
{
|
||
plp = lp -> prev;
|
||
(*h->freefun) ((POINTER) lp);
|
||
lp = plp;
|
||
}
|
||
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 ();
|
||
}
|
||
|
||
/* Let same .o link with output of gcc and other compilers. */
|
||
|
||
#ifdef __STDC__
|
||
int
|
||
_obstack_free (h, obj)
|
||
struct obstack *h;
|
||
POINTER obj;
|
||
{
|
||
obstack_free (h, obj);
|
||
}
|
||
#endif
|
||
|
||
/* #if 0 */
|
||
/* These are now turned off because the applications do not use it
|
||
and it uses bcopy via obstack_grow, which causes trouble on sysV. */
|
||
|
||
/* Now define the functional versions of the obstack macros.
|
||
Define them to simply use the corresponding macros to do the job. */
|
||
|
||
#ifdef __STDC__
|
||
/* These function definitions do not work with non-ANSI preprocessors;
|
||
they won't pass through the macro names in parentheses. */
|
||
|
||
/* The function names appear in parentheses in order to prevent
|
||
the macro-definitions of the names from being expanded there. */
|
||
|
||
POINTER (obstack_base) (obstack)
|
||
struct obstack *obstack;
|
||
{
|
||
return obstack_base (obstack);
|
||
}
|
||
|
||
POINTER (obstack_next_free) (obstack)
|
||
struct obstack *obstack;
|
||
{
|
||
return obstack_next_free (obstack);
|
||
}
|
||
|
||
int (obstack_object_size) (obstack)
|
||
struct obstack *obstack;
|
||
{
|
||
return obstack_object_size (obstack);
|
||
}
|
||
|
||
int (obstack_room) (obstack)
|
||
struct obstack *obstack;
|
||
{
|
||
return obstack_room (obstack);
|
||
}
|
||
|
||
void (obstack_grow) (obstack, pointer, length)
|
||
struct obstack *obstack;
|
||
POINTER pointer;
|
||
int length;
|
||
{
|
||
obstack_grow (obstack, pointer, length);
|
||
}
|
||
|
||
void (obstack_grow0) (obstack, pointer, length)
|
||
struct obstack *obstack;
|
||
POINTER pointer;
|
||
int length;
|
||
{
|
||
obstack_grow0 (obstack, pointer, length);
|
||
}
|
||
|
||
void (obstack_1grow) (obstack, character)
|
||
struct obstack *obstack;
|
||
int character;
|
||
{
|
||
obstack_1grow (obstack, character);
|
||
}
|
||
|
||
void (obstack_blank) (obstack, length)
|
||
struct obstack *obstack;
|
||
int length;
|
||
{
|
||
obstack_blank (obstack, length);
|
||
}
|
||
|
||
void (obstack_1grow_fast) (obstack, character)
|
||
struct obstack *obstack;
|
||
int character;
|
||
{
|
||
obstack_1grow_fast (obstack, character);
|
||
}
|
||
|
||
void (obstack_blank_fast) (obstack, length)
|
||
struct obstack *obstack;
|
||
int length;
|
||
{
|
||
obstack_blank_fast (obstack, length);
|
||
}
|
||
|
||
POINTER (obstack_finish) (obstack)
|
||
struct obstack *obstack;
|
||
{
|
||
return obstack_finish (obstack);
|
||
}
|
||
|
||
POINTER (obstack_alloc) (obstack, length)
|
||
struct obstack *obstack;
|
||
int length;
|
||
{
|
||
return obstack_alloc (obstack, length);
|
||
}
|
||
|
||
POINTER (obstack_copy) (obstack, pointer, length)
|
||
struct obstack *obstack;
|
||
POINTER pointer;
|
||
int length;
|
||
{
|
||
return obstack_copy (obstack, pointer, length);
|
||
}
|
||
|
||
POINTER (obstack_copy0) (obstack, pointer, length)
|
||
struct obstack *obstack;
|
||
POINTER pointer;
|
||
int length;
|
||
{
|
||
return obstack_copy0 (obstack, pointer, length);
|
||
}
|
||
|
||
#endif /* __STDC__ */
|
||
|
||
/* #endif 0 */
|