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/* Vector API for GNU compiler.
Copyright (C) 2004, 2005 Free Software Foundation, Inc.
Contributed by Nathan Sidwell <nathan@codesourcery.com>
This file is part of GCC.
GCC 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 2, or (at your option) any later
version.
GCC 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 GCC; see the file COPYING. If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA. */
#include "config.h"
#include "system.h"
#include "ggc.h"
#include "vec.h"
#include "errors.h"
#include "coretypes.h"
#include "tree.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. */
gcc_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_gc_p_reserve (void *vec, int reserve MEM_STAT_DECL)
{
return vec_gc_o_reserve (vec, reserve,
offsetof (struct vec_prefix, vec), sizeof (void *)
PASS_MEM_STAT);
}
/* As vec_gc_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_gc_o_reserve (void *vec, int reserve, size_t vec_offset, size_t elt_size
MEM_STAT_DECL)
{
struct vec_prefix *pfx = vec;
unsigned alloc = alloc = calculate_allocation (pfx, reserve);
if (!alloc)
return NULL;
vec = ggc_realloc_stat (vec, vec_offset + alloc * elt_size PASS_MEM_STAT);
((struct vec_prefix *)vec)->alloc = alloc;
if (!pfx)
((struct vec_prefix *)vec)->num = 0;
return vec;
}
/* As for vec_gc_p_reserve, but for heap allocated vectors. */
void *
vec_heap_p_reserve (void *vec, int reserve MEM_STAT_DECL)
{
return vec_heap_o_reserve (vec, reserve,
offsetof (struct vec_prefix, vec), sizeof (void *)
PASS_MEM_STAT);
}
/* As for vec_gc_o_reserve, but for heap allocated vectors. */
void *
vec_heap_o_reserve (void *vec, int reserve, size_t vec_offset, size_t elt_size
MEM_STAT_DECL)
{
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 ENABLE_CHECKING
/* Issue a vector domain error, and then fall over. */
void
vec_assert_fail (const char *op, const char *struct_name,
const char *file, unsigned int line, const char *function)
{
internal_error ("vector %s %s domain error, in %s at %s:%u",
struct_name, op, function, trim_filename (file), line);
}
#endif
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