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/* Virtual array support.

   Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2006, 2007, 2008

   Free Software Foundation, Inc.

   Contributed by Cygnus Solutions.

   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 3, 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 COPYING3.  If not see

   <http://www.gnu.org/licenses/>.  */

#include "config.h"

#include "system.h"

#include "coretypes.h"

#include "tm.h"

#include "toplev.h"

#include "varray.h"

#include "ggc.h"

#include "hashtab.h"

#define VARRAY_HDR_SIZE (sizeof (struct varray_head_tag) - sizeof (varray_data))

#ifdef GATHER_STATISTICS

/* Store information about each particular varray.  */

struct varray_descriptor

{

  const char *name;

  int allocated;

  int created;

  int resized;

  int copied;

};

/* 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 = (const struct varray_descriptor *) p;

  return htab_hash_pointer (d->name);

}

static int

eq_descriptor (const void *p1, const void *p2)

{

  const struct varray_descriptor *d = (const struct varray_descriptor *) 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),

                              INSERT);

  if (*slot)

    return *slot;

  *slot = XCNEW (struct varray_descriptor);

  (*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 },

  { sizeof (void *), 0 },

  { 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 },

  { sizeof (struct basic_block_def *), 1 },

  { sizeof (struct elt_list *), 1 },

  { sizeof (struct edge_def *), 1 },

  { sizeof (tree *), 1 },

};

/* Allocate a virtual array with NUM_ELEMENT elements, each of which is

   ELEMENT_SIZE bytes long, named NAME.  Array elements are zeroed.  */

varray_type

varray_init (size_t num_elements, enum varray_data_enum element_kind,

             const char *name)

{

  size_t data_size = num_elements * element[element_kind].size;

  varray_type ptr;

#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_CNEWVAR (struct varray_head_tag, VARRAY_HDR_SIZE + data_size);

  else

    ptr = XCNEWVAR (struct varray_head_tag, VARRAY_HDR_SIZE + data_size);

  ptr->num_elements = num_elements;

  ptr->elements_used = 0;

  ptr->type = element_kind;

  ptr->name = name;

  return ptr;

}

/* Grow/shrink the virtual array VA to N elements.  Zero any new elements

   allocated.  */

varray_type

varray_grow (varray_type va, size_t n)

{

  size_t old_elements = va->num_elements;

  if (n != old_elements)

    {

      size_t elem_size = element[va->type].size;

      size_t old_data_size = old_elements * elem_size;

      size_t data_size = n * elem_size;

#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

      if (element[va->type].uses_ggc)

        va = GGC_RESIZEVAR (struct varray_head_tag, va,

                            VARRAY_HDR_SIZE + data_size);

      else

        va = XRESIZEVAR (struct varray_head_tag, va,

                         VARRAY_HDR_SIZE + data_size);

      va->num_elements = n;

      if (n > old_elements)

        memset (&va->data.vdt_c[old_data_size], 0, data_size - old_data_size);

#ifdef GATHER_STATISTICS

      if (oldva != va)

        desc->copied++;

#endif

    }

  return va;

}

/* Reset a varray to its original state.  */

void

varray_clear (varray_type va)

{

  size_t data_size = element[va->type].size * va->num_elements;

  memset (va->data.vdt_c, 0, data_size);

  va->elements_used = 0;

}

/* Check the bounds of a varray access.  */

#if defined ENABLE_CHECKING && (GCC_VERSION >= 2007)

void

varray_check_failed (varray_type va, size_t n, const char *file, int line,

                     const char *function)

{

  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);

}

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

/* Output per-varray statistics.  */

#ifdef GATHER_STATISTICS

/* Used to accumulate statistics about varray sizes.  */

struct output_info

{

  int count;

  int size;

};

/* Called via htab_traverse.  Output varray descriptor pointed out by SLOT

   and update statistics.  */

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

/* Output per-varray memory usage statistics.  */

void

dump_varray_statistics (void)

{

#ifdef GATHER_STATISTICS

  struct output_info info;

  if (varray_hash)

    {

      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

}