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/* vim:ts=8:sts=8:sw=4:noai:noexpandtab
*
* portable fail fast memory allocation.
*
* Copyright (c) 2010 Miru Limited.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <ctype.h>
#include <stdio.h>
#include <strings.h>
#ifdef _WIN32
# define strcasecmp stricmp
#endif
#include <impl/framework.h>
#include <impl/mem.h>
//#define MEM_DEBUG
/* globals */
bool pgm_mem_gc_friendly PGM_GNUC_READ_MOSTLY = FALSE;
/* locals */
struct pgm_debug_key_t {
const char* key;
unsigned value;
};
typedef struct pgm_debug_key_t pgm_debug_key_t;
static volatile uint32_t mem_ref_count = 0;
static
bool
debug_key_matches (
const char* restrict key,
const char* restrict token,
unsigned length
)
{
for (; length; length--, key++, token++)
{
const char k = (*key == '_') ? '-' : tolower (*key );
const char t = (*token == '_') ? '-' : tolower (*token);
if (k != t)
return FALSE;
}
return *key == '\0';
}
static
unsigned
pgm_parse_debug_string (
const char* restrict string,
const pgm_debug_key_t* restrict keys,
const unsigned nkeys
)
{
unsigned result = 0;
if (NULL == string)
return result;
if (!strcasecmp (string, "all"))
{
for (unsigned i = 0; i < nkeys; i++)
result |= keys[i].value;
}
else if (!strcasecmp (string, "help"))
{
fprintf (stderr, "Supported debug values:");
for (unsigned i = 0; i < nkeys; i++)
fprintf (stderr, " %s", keys[i].key);
fprintf (stderr, "\n");
}
else
{
while (string) {
const char* q = strpbrk (string, ":;, \t");
if (!q)
q = string + strlen (string);
for (unsigned i = 0; i < nkeys; i++)
if (debug_key_matches (keys[i].key, string, q - string))
result |= keys[i].value;
string = q;
if (*string)
string++;
}
}
return result;
}
void
pgm_mem_init (void)
{
static const pgm_debug_key_t keys[] = {
{ "gc-friendly", 1 },
};
if (pgm_atomic_exchange_and_add32 (&mem_ref_count, 1) > 0)
return;
const char *val = getenv ("PGM_DEBUG");
const unsigned flags = !val ? 0 : pgm_parse_debug_string (val, keys, PGM_N_ELEMENTS (keys));
if (flags & 1)
pgm_mem_gc_friendly = TRUE;
}
void
pgm_mem_shutdown (void)
{
pgm_return_if_fail (pgm_atomic_read32 (&mem_ref_count) > 0);
if (pgm_atomic_exchange_and_add32 (&mem_ref_count, (uint32_t)-1) != 1)
return;
/* nop */
}
/* malloc wrappers to hard fail */
void*
pgm_malloc (
const size_t n_bytes
)
{
if (PGM_LIKELY (n_bytes))
{
void* mem = malloc (n_bytes);
if (mem)
return mem;
pgm_fatal ("file %s: line %d (%s): failed to allocate %zu bytes",
__FILE__, __LINE__, __PRETTY_FUNCTION__,
n_bytes);
abort ();
}
return NULL;
}
#define SIZE_OVERFLOWS(a,b) (PGM_UNLIKELY ((a) > SIZE_MAX / (b)))
void*
pgm_malloc_n (
const size_t n_blocks,
const size_t block_bytes
)
{
if (SIZE_OVERFLOWS (n_blocks, block_bytes)) {
pgm_fatal ("file %s: line %d (%s): overflow allocating %zu*%zu bytes",
__FILE__, __LINE__, __PRETTY_FUNCTION__,
n_blocks, block_bytes);
}
return pgm_malloc (n_blocks * block_bytes);
}
void*
pgm_malloc0 (
const size_t n_bytes
)
{
if (PGM_LIKELY (n_bytes))
{
void* mem = calloc (1, n_bytes);
if (mem)
return mem;
pgm_fatal ("file %s: line %d (%s): failed to allocate %zu bytes",
__FILE__, __LINE__, __PRETTY_FUNCTION__,
n_bytes);
abort ();
}
return NULL;
}
void*
pgm_malloc0_n (
const size_t n_blocks,
const size_t block_bytes
)
{
if (PGM_LIKELY (n_blocks && block_bytes))
{
void* mem = calloc (n_blocks, block_bytes);
if (mem)
return mem;
pgm_fatal ("file %s: line %d (%s): failed to allocate %zu*%zu bytes",
__FILE__, __LINE__, __PRETTY_FUNCTION__,
n_blocks, block_bytes);
abort ();
}
return NULL;
}
void*
pgm_memdup (
const void* mem,
const size_t n_bytes
)
{
void* new_mem;
if (PGM_LIKELY (NULL != mem))
{
new_mem = pgm_malloc (n_bytes);
memcpy (new_mem, mem, n_bytes);
}
else
new_mem = NULL;
return new_mem;
}
void*
pgm_realloc (
void* mem,
const size_t n_bytes
)
{
return realloc (mem, n_bytes);
}
void
pgm_free (
void* mem
)
{
if (PGM_LIKELY (NULL != mem))
free (mem);
}
/* eof */
|
