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/* Vector API for GNU compiler.
Copyright (C) 2004, 2005, 2006, 2007, 2008 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 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/>. */
/* This file is compiled twice: once for the generator programs
once for the compiler. */
#ifdef GENERATOR_FILE
#include "bconfig.h"
#else
#include "config.h"
#endif
#include "system.h"
#include "ggc.h"
#include "vec.h"
#include "coretypes.h"
#include "toplev.h"
#include "hashtab.h"
struct vec_prefix
{
unsigned num;
unsigned alloc;
void *vec[1];
};
#ifdef GATHER_STATISTICS
/* Store information about each particular vector. */
struct vec_descriptor
{
const char *function;
const char *file;
int line;
size_t allocated;
size_t times;
size_t peak;
};
/* Hashtable mapping vec addresses to descriptors. */
static htab_t vec_desc_hash;
/* Hashtable helpers. */
static hashval_t
hash_descriptor (const void *p)
{
const struct vec_descriptor *const d =
(const struct vec_descriptor *) p;
return htab_hash_pointer (d->file) + d->line;
}
static int
eq_descriptor (const void *p1, const void *p2)
{
const struct vec_descriptor *const d = (const struct vec_descriptor *) p1;
const struct vec_descriptor *const l = (const struct vec_descriptor *) p2;
return d->file == l->file && d->function == l->function && d->line == l->line;
}
/* Hashtable converting address of allocated field to loc descriptor. */
static htab_t ptr_hash;
struct ptr_hash_entry
{
void *ptr;
struct vec_descriptor *loc;
size_t allocated;
};
/* Hash table helpers functions. */
static hashval_t
hash_ptr (const void *p)
{
const struct ptr_hash_entry *const d = (const struct ptr_hash_entry *) p;
return htab_hash_pointer (d->ptr);
}
static int
eq_ptr (const void *p1, const void *p2)
{
const struct ptr_hash_entry *const p = (const struct ptr_hash_entry *) p1;
return (p->ptr == p2);
}
/* Return descriptor for given call site, create new one if needed. */
static struct vec_descriptor *
vec_descriptor (const char *name, int line, const char *function)
{
struct vec_descriptor loc;
struct vec_descriptor **slot;
loc.file = name;
loc.line = line;
loc.function = function;
if (!vec_desc_hash)
vec_desc_hash = htab_create (10, hash_descriptor, eq_descriptor, NULL);
slot = (struct vec_descriptor **) htab_find_slot (vec_desc_hash, &loc, 1);
if (*slot)
return *slot;
*slot = XCNEW (struct vec_descriptor);
(*slot)->file = name;
(*slot)->line = line;
(*slot)->function = function;
(*slot)->allocated = 0;
(*slot)->peak = 0;
return *slot;
}
/* Account the overhead. */
static void
register_overhead (struct vec_prefix *ptr, size_t size,
const char *name, int line, const char *function)
{
struct vec_descriptor *loc = vec_descriptor (name, line, function);
struct ptr_hash_entry *p = XNEW (struct ptr_hash_entry);
PTR *slot;
p->ptr = ptr;
p->loc = loc;
p->allocated = size;
if (!ptr_hash)
ptr_hash = htab_create (10, hash_ptr, eq_ptr, NULL);
slot = htab_find_slot_with_hash (ptr_hash, ptr, htab_hash_pointer (ptr), INSERT);
gcc_assert (!*slot);
*slot = p;
loc->allocated += size;
if (loc->peak < loc->allocated)
loc->peak += loc->allocated;
loc->times++;
}
/* Notice that the pointer has been freed. */
static void
free_overhead (struct vec_prefix *ptr)
{
PTR *slot = htab_find_slot_with_hash (ptr_hash, ptr, htab_hash_pointer (ptr),
NO_INSERT);
struct ptr_hash_entry *p = (struct ptr_hash_entry *) *slot;
p->loc->allocated -= p->allocated;
htab_clear_slot (ptr_hash, slot);
free (p);
}
void
vec_heap_free (void *ptr)
{
free_overhead ((struct vec_prefix *)ptr);
free (ptr);
}
#endif
/* Calculate the new ALLOC value, making sure that RESERVE slots are
free. If EXACT grow exactly, otherwise grow exponentially. */
static inline unsigned
calculate_allocation (const struct vec_prefix *pfx, int reserve, bool exact)
{
unsigned alloc = 0;
unsigned num = 0;
gcc_assert (reserve >= 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);
if (exact)
/* 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 RESERVE free slots in VEC. If EXACT grow
exactly, else grow exponentially. As a special case, if VEC is
NULL and RESERVE is 0, no vector will be created. The vector's
trailing array is at VEC_OFFSET offset and consists of ELT_SIZE
sized elements. */
static void *
vec_gc_o_reserve_1 (void *vec, int reserve, size_t vec_offset, size_t elt_size,
bool exact MEM_STAT_DECL)
{
struct vec_prefix *pfx = (struct vec_prefix *) vec;
unsigned alloc = alloc = calculate_allocation (pfx, reserve, exact);
if (!alloc)
{
if (pfx)
ggc_free (pfx);
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;
}
/* Ensure there are at least RESERVE free slots in VEC, growing
exponentially. 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_1 (vec, reserve,
offsetof (struct vec_prefix, vec),
sizeof (void *), false
PASS_MEM_STAT);
}
/* Ensure there are at least RESERVE free slots in VEC, growing
exactly. 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_exact (void *vec, int reserve MEM_STAT_DECL)
{
return vec_gc_o_reserve_1 (vec, reserve,
offsetof (struct vec_prefix, vec),
sizeof (void *), true
PASS_MEM_STAT);
}
/* As for 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)
{
return vec_gc_o_reserve_1 (vec, reserve, vec_offset, elt_size, false
PASS_MEM_STAT);
}
/* As for vec_gc_p_reserve_exact, 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_exact (void *vec, int reserve, size_t vec_offset,
size_t elt_size MEM_STAT_DECL)
{
return vec_gc_o_reserve_1 (vec, reserve, vec_offset, elt_size, true
PASS_MEM_STAT);
}
/* As for vec_gc_o_reserve_1, but for heap allocated vectors. */
static void *
vec_heap_o_reserve_1 (void *vec, int reserve, size_t vec_offset,
size_t elt_size, bool exact MEM_STAT_DECL)
{
struct vec_prefix *pfx = (struct vec_prefix *) vec;
unsigned alloc = calculate_allocation (pfx, reserve, exact);
if (!alloc)
{
if (pfx)
vec_heap_free (pfx);
return NULL;
}
#ifdef GATHER_STATISTICS
if (vec)
free_overhead (pfx);
#endif
vec = xrealloc (vec, vec_offset + alloc * elt_size);
((struct vec_prefix *)vec)->alloc = alloc;
if (!pfx)
((struct vec_prefix *)vec)->num = 0;
#ifdef GATHER_STATISTICS
if (vec)
register_overhead ((struct vec_prefix *)vec,
vec_offset + alloc * elt_size PASS_MEM_STAT);
#endif
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_1 (vec, reserve,
offsetof (struct vec_prefix, vec),
sizeof (void *), false
PASS_MEM_STAT);
}
/* As for vec_gc_p_reserve_exact, but for heap allocated vectors. */
void *
vec_heap_p_reserve_exact (void *vec, int reserve MEM_STAT_DECL)
{
return vec_heap_o_reserve_1 (vec, reserve,
offsetof (struct vec_prefix, vec),
sizeof (void *), true
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)
{
return vec_heap_o_reserve_1 (vec, reserve, vec_offset, elt_size, false
PASS_MEM_STAT);
}
/* As for vec_gc_o_reserve_exact, but for heap allocated vectors. */
void *
vec_heap_o_reserve_exact (void *vec, int reserve, size_t vec_offset,
size_t elt_size MEM_STAT_DECL)
{
return vec_heap_o_reserve_1 (vec, reserve, vec_offset, elt_size, true
PASS_MEM_STAT);
}
#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
#ifdef GATHER_STATISTICS
/* Helper for qsort; sort descriptors by amount of memory consumed. */
static int
cmp_statistic (const void *loc1, const void *loc2)
{
const struct vec_descriptor *const l1 =
*(const struct vec_descriptor *const *) loc1;
const struct vec_descriptor *const l2 =
*(const struct vec_descriptor *const *) loc2;
long diff;
diff = l1->allocated - l2->allocated;
if (!diff)
diff = l1->peak - l2->peak;
if (!diff)
diff = l1->times - l2->times;
return diff > 0 ? 1 : diff < 0 ? -1 : 0;
}
/* Collect array of the descriptors from hashtable. */
static struct vec_descriptor **loc_array;
static int
add_statistics (void **slot, void *b)
{
int *n = (int *)b;
loc_array[*n] = (struct vec_descriptor *) *slot;
(*n)++;
return 1;
}
/* Dump per-site memory statistics. */
#endif
void
dump_vec_loc_statistics (void)
{
#ifdef GATHER_STATISTICS
int nentries = 0;
char s[4096];
size_t allocated = 0;
size_t times = 0;
int i;
loc_array = XCNEWVEC (struct vec_descriptor *, vec_desc_hash->n_elements);
fprintf (stderr, "Heap vectors:\n");
fprintf (stderr, "\n%-48s %10s %10s %10s\n",
"source location", "Leak", "Peak", "Times");
fprintf (stderr, "-------------------------------------------------------\n");
htab_traverse (vec_desc_hash, add_statistics, &nentries);
qsort (loc_array, nentries, sizeof (*loc_array), cmp_statistic);
for (i = 0; i < nentries; i++)
{
struct vec_descriptor *d = loc_array[i];
allocated += d->allocated;
times += d->times;
}
for (i = 0; i < nentries; i++)
{
struct vec_descriptor *d = loc_array[i];
const char *s1 = d->file;
const char *s2;
while ((s2 = strstr (s1, "gcc/")))
s1 = s2 + 4;
sprintf (s, "%s:%i (%s)", s1, d->line, d->function);
s[48] = 0;
fprintf (stderr, "%-48s %10li:%4.1f%% %10li %10li:%4.1f%% \n", s,
(long)d->allocated,
(d->allocated) * 100.0 / allocated,
(long)d->peak,
(long)d->times,
(d->times) * 100.0 / times);
}
fprintf (stderr, "%-48s %10ld %10ld\n",
"Total", (long)allocated, (long)times);
fprintf (stderr, "\n%-48s %10s %10s %10s\n",
"source location", "Leak", "Peak", "Times");
fprintf (stderr, "-------------------------------------------------------\n");
#endif
}
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