a9762ec78a
Switch the license of all .h files to GPLv3.
Switch the license of all .cc files to GPLv3.
119 lines
2.9 KiB
C
119 lines
2.9 KiB
C
/* Vector API for GDB.
|
|
Copyright (C) 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
|
|
Contributed by Nathan Sidwell <nathan@codesourcery.com>
|
|
|
|
This file is part of GDB.
|
|
|
|
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 3 of the License, 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, see <http://www.gnu.org/licenses/>. */
|
|
|
|
#include "defs.h"
|
|
#include "vec.h"
|
|
|
|
struct vec_prefix
|
|
{
|
|
unsigned num;
|
|
unsigned alloc;
|
|
void *vec[1];
|
|
};
|
|
|
|
/* Calculate the new ALLOC value, making sure that abs(RESERVE) slots
|
|
are free. If RESERVE < 0 grow exactly, otherwise grow
|
|
exponentially. */
|
|
|
|
static inline unsigned
|
|
calculate_allocation (const struct vec_prefix *pfx, int reserve)
|
|
{
|
|
unsigned alloc = 0;
|
|
unsigned num = 0;
|
|
|
|
if (pfx)
|
|
{
|
|
alloc = pfx->alloc;
|
|
num = pfx->num;
|
|
}
|
|
else if (!reserve)
|
|
/* If there's no prefix, and we've not requested anything, then we
|
|
will create a NULL vector. */
|
|
return 0;
|
|
|
|
/* We must have run out of room. */
|
|
gdb_assert (alloc - num < (unsigned)(reserve < 0 ? -reserve : reserve));
|
|
|
|
if (reserve < 0)
|
|
/* Exact size. */
|
|
alloc = num + -reserve;
|
|
else
|
|
{
|
|
/* Exponential growth. */
|
|
if (!alloc)
|
|
alloc = 4;
|
|
else if (alloc < 16)
|
|
/* Double when small. */
|
|
alloc = alloc * 2;
|
|
else
|
|
/* Grow slower when large. */
|
|
alloc = (alloc * 3 / 2);
|
|
|
|
/* If this is still too small, set it to the right size. */
|
|
if (alloc < num + reserve)
|
|
alloc = num + reserve;
|
|
}
|
|
return alloc;
|
|
}
|
|
|
|
/* Ensure there are at least abs(RESERVE) free slots in VEC. If
|
|
RESERVE < 0 grow exactly, else grow exponentially. As a special
|
|
case, if VEC is NULL, and RESERVE is 0, no vector will be created. */
|
|
|
|
void *
|
|
vec_p_reserve (void *vec, int reserve)
|
|
{
|
|
return vec_o_reserve (vec, reserve,
|
|
offsetof (struct vec_prefix, vec), sizeof (void *));
|
|
}
|
|
|
|
/* As vec_p_reserve, but for object vectors. The vector's trailing
|
|
array is at VEC_OFFSET offset and consists of ELT_SIZE sized
|
|
elements. */
|
|
|
|
void *
|
|
vec_o_reserve (void *vec, int reserve, size_t vec_offset, size_t elt_size)
|
|
{
|
|
struct vec_prefix *pfx = vec;
|
|
unsigned alloc = calculate_allocation (pfx, reserve);
|
|
|
|
if (!alloc)
|
|
return NULL;
|
|
|
|
vec = xrealloc (vec, vec_offset + alloc * elt_size);
|
|
((struct vec_prefix *)vec)->alloc = alloc;
|
|
if (!pfx)
|
|
((struct vec_prefix *)vec)->num = 0;
|
|
|
|
return vec;
|
|
}
|
|
|
|
#if 0
|
|
/* Example uses. */
|
|
DEF_VEC_I (int);
|
|
typedef struct X
|
|
{
|
|
int i;
|
|
} obj_t;
|
|
typedef obj_t *ptr_t;
|
|
|
|
DEF_VEC_P (ptr_t);
|
|
DEF_VEC_O (obj_t);
|
|
#endif
|