freebsd-dev/contrib/gcc/varray.c

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/* Virtual array support.
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Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2006
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Free Software Foundation, Inc.
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Contributed by Cygnus Solutions.
This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it
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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.
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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
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the Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
MA 02110-1301, USA. */
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#include "config.h"
#include "system.h"
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#include "coretypes.h"
#include "tm.h"
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#include "toplev.h"
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#include "varray.h"
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#include "ggc.h"
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#include "hashtab.h"
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#define VARRAY_HDR_SIZE (sizeof (struct varray_head_tag) - sizeof (varray_data))
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#ifdef GATHER_STATISTICS
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/* Store information about each particular varray. */
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struct varray_descriptor
{
const char *name;
int allocated;
int created;
int resized;
int copied;
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};
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/* Hashtable mapping varray names to descriptors. */
static htab_t varray_hash;
/* Hashtable helpers. */
static hashval_t
hash_descriptor (const void *p)
{
const struct varray_descriptor *d = p;
return htab_hash_pointer (d->name);
}
static int
eq_descriptor (const void *p1, const void *p2)
{
const struct varray_descriptor *d = p1;
return d->name == p2;
}
/* For given name, return descriptor, create new if needed. */
static struct varray_descriptor *
varray_descriptor (const char *name)
{
struct varray_descriptor **slot;
if (!varray_hash)
varray_hash = htab_create (10, hash_descriptor, eq_descriptor, NULL);
slot = (struct varray_descriptor **)
htab_find_slot_with_hash (varray_hash, name,
htab_hash_pointer (name),
1);
if (*slot)
return *slot;
*slot = xcalloc (sizeof (**slot), 1);
(*slot)->name = name;
return *slot;
}
#endif
/* Do not add any more non-GC items here. Please either remove or GC
those items that are not GCed. */
static const struct {
unsigned char size;
bool uses_ggc;
} element[NUM_VARRAY_DATA] = {
{ sizeof (char), 1 },
{ sizeof (unsigned char), 1 },
{ sizeof (short), 1 },
{ sizeof (unsigned short), 1 },
{ sizeof (int), 1 },
{ sizeof (unsigned int), 1 },
{ sizeof (long), 1 },
{ sizeof (unsigned long), 1 },
{ sizeof (HOST_WIDE_INT), 1 },
{ sizeof (unsigned HOST_WIDE_INT), 1 },
{ sizeof (void *), 1 },
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{ sizeof (void *), 0 },
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{ sizeof (char *), 1 },
{ sizeof (struct rtx_def *), 1 },
{ sizeof (struct rtvec_def *), 1 },
{ sizeof (union tree_node *), 1 },
{ sizeof (struct bitmap_head_def *), 1 },
{ sizeof (struct reg_info_def *), 0 },
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{ sizeof (struct basic_block_def *), 1 },
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{ sizeof (struct elt_list *), 1 },
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{ sizeof (struct edge_def *), 1 },
{ sizeof (tree *), 1 },
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};
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/* Allocate a virtual array with NUM_ELEMENT elements, each of which is
ELEMENT_SIZE bytes long, named NAME. Array elements are zeroed. */
varray_type
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varray_init (size_t num_elements, enum varray_data_enum element_kind,
const char *name)
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{
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size_t data_size = num_elements * element[element_kind].size;
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varray_type ptr;
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#ifdef GATHER_STATISTICS
struct varray_descriptor *desc = varray_descriptor (name);
desc->created++;
desc->allocated += data_size + VARRAY_HDR_SIZE;
#endif
if (element[element_kind].uses_ggc)
ptr = ggc_alloc_cleared (VARRAY_HDR_SIZE + data_size);
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else
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ptr = xcalloc (VARRAY_HDR_SIZE + data_size, 1);
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ptr->num_elements = num_elements;
ptr->elements_used = 0;
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ptr->type = element_kind;
ptr->name = name;
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return ptr;
}
/* Grow/shrink the virtual array VA to N elements. Zero any new elements
allocated. */
varray_type
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varray_grow (varray_type va, size_t n)
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{
size_t old_elements = va->num_elements;
if (n != old_elements)
{
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size_t elem_size = element[va->type].size;
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size_t old_data_size = old_elements * elem_size;
size_t data_size = n * elem_size;
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#ifdef GATHER_STATISTICS
struct varray_descriptor *desc = varray_descriptor (va->name);
varray_type oldva = va;
if (data_size > old_data_size)
desc->allocated += data_size - old_data_size;
desc->resized ++;
#endif
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if (element[va->type].uses_ggc)
va = ggc_realloc (va, VARRAY_HDR_SIZE + data_size);
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else
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va = xrealloc (va, VARRAY_HDR_SIZE + data_size);
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va->num_elements = n;
if (n > old_elements)
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memset (&va->data.vdt_c[old_data_size], 0, data_size - old_data_size);
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#ifdef GATHER_STATISTICS
if (oldva != va)
desc->copied++;
#endif
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}
return va;
}
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/* Reset a varray to its original state. */
void
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varray_clear (varray_type va)
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{
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size_t data_size = element[va->type].size * va->num_elements;
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memset (va->data.vdt_c, 0, data_size);
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va->elements_used = 0;
}
/* Check the bounds of a varray access. */
#if defined ENABLE_CHECKING && (GCC_VERSION >= 2007)
void
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varray_check_failed (varray_type va, size_t n, const char *file, int line,
const char *function)
{
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internal_error ("virtual array %s[%lu]: element %lu out of bounds "
"in %s, at %s:%d",
va->name, (unsigned long) va->num_elements, (unsigned long) n,
function, trim_filename (file), line);
}
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void
varray_underflow (varray_type va, const char *file, int line,
const char *function)
{
internal_error ("underflowed virtual array %s in %s, at %s:%d",
va->name, function, trim_filename (file), line);
}
#endif
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/* Output per-varray statistics. */
#ifdef GATHER_STATISTICS
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/* Used to accumulate statistics about varray sizes. */
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struct output_info
{
int count;
int size;
};
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/* Called via htab_traverse. Output varray descriptor pointed out by SLOT
and update statistics. */
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static int
print_statistics (void **slot, void *b)
{
struct varray_descriptor *d = (struct varray_descriptor *) *slot;
struct output_info *i = (struct output_info *) b;
if (d->allocated)
{
fprintf (stderr, "%-21s %6d %10d %7d %7d\n", d->name,
d->created, d->allocated, d->resized, d->copied);
i->size += d->allocated;
i->count += d->created;
}
return 1;
}
#endif
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/* Output per-varray memory usage statistics. */
void
dump_varray_statistics (void)
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{
#ifdef GATHER_STATISTICS
struct output_info info;
fprintf (stderr, "\nVARRAY Kind Count Bytes Resized copied\n");
fprintf (stderr, "-------------------------------------------------------\n");
info.count = 0;
info.size = 0;
htab_traverse (varray_hash, print_statistics, &info);
fprintf (stderr, "-------------------------------------------------------\n");
fprintf (stderr, "%-20s %7d %10d\n",
"Total", info.count, info.size);
fprintf (stderr, "-------------------------------------------------------\n");
#endif
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}