add vipsobject cache

added the cache ... compiles, but not yet in use
This commit is contained in:
John Cupitt 2011-09-06 16:41:37 +01:00
parent e99f6cc49e
commit 53b3018f41
4 changed files with 382 additions and 0 deletions

11
TODO
View File

@ -1,3 +1,14 @@
- vips_object_build() needs a new type ... should return the VipsObject it
makes
that way we can drop the cache lookup in
- im_copy() would be useful
- could we generate the code for vips_add() automatically? it might be nice to - could we generate the code for vips_add() automatically? it might be nice to

View File

@ -368,6 +368,8 @@ void vips_object_sanity_all( void );
void vips_object_rewind( VipsObject *object ); void vips_object_rewind( VipsObject *object );
VipsObject *vips_cache_lookup( VipsObject *object );
#ifdef __cplusplus #ifdef __cplusplus
} }
#endif /*__cplusplus*/ #endif /*__cplusplus*/

View File

@ -11,6 +11,7 @@ libiofuncs_la_SOURCES = \
vips.c \ vips.c \
generate.c \ generate.c \
mapfile.c \ mapfile.c \
cache.c \
sink.h \ sink.h \
sink.c \ sink.c \
sinkmemory.c \ sinkmemory.c \

368
libvips/iofuncs/cache.c Normal file
View File

@ -0,0 +1,368 @@
/* cache vips operations
*/
/*
This file is part of VIPS.
VIPS 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 of the License, or
(at your option) any later version.
This program 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 program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
*/
/*
#define VIPS_DEBUG
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <vips/intl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif /*HAVE_UNISTD_H*/
#include <ctype.h>
#include <vips/vips.h>
#include <vips/internal.h>
#include <vips/debug.h>
#ifdef WITH_DMALLOC
#include <dmalloc.h>
#endif /*WITH_DMALLOC*/
/* An object in the cache. Keep a set of these in our object hash table.
*/
typedef struct _VipsCacheItem {
VipsObject *object;
/* Cache hash code here.
*/
unsigned int hash;
gboolean found_hash;
} VipsCacheItem;
static GHashTable *vips_object_cache = NULL;
static unsigned int
vips_value_hash( GValue *value )
{
switch( G_VALUE_TYPE( value ) ) {
case G_TYPE_BOOLEAN:
return( (unsigned int) g_value_get_boolean( value ) );
case G_TYPE_CHAR:
return( (unsigned int) g_value_get_char( value ) );
case G_TYPE_UCHAR:
return( (unsigned int) g_value_get_uchar( value ) );
case G_TYPE_INT:
return( (unsigned int) g_value_get_int( value ) );
case G_TYPE_UINT:
return( (unsigned int) g_value_get_uint( value ) );
case G_TYPE_LONG:
return( (unsigned int) g_value_get_long( value ) );
case G_TYPE_ULONG:
return( (unsigned int) g_value_get_ulong( value ) );
case G_TYPE_ENUM:
return( (unsigned int) g_value_get_enum( value ) );
case G_TYPE_FLAGS:
return( (unsigned int) g_value_get_flags( value ) );
case G_TYPE_UINT64:
return( (unsigned int) g_value_get_uint64( value ) );
case G_TYPE_INT64:
{
gint64 i = g_value_get_int64( value );
return( g_int64_hash( &i ) );
}
case G_TYPE_FLOAT:
{
float f = g_value_get_float( value );
return( *((unsigned int *) &f) );
}
case G_TYPE_DOUBLE:
{
double d = g_value_get_double( value );
return( g_double_hash( &d ) );
}
case G_TYPE_STRING:
{
const char *s = g_value_get_string( value );
return( g_str_hash( s ) );
}
case G_TYPE_BOXED:
{
void *p = g_value_get_boxed( value );
return( g_direct_hash( p ) );
}
case G_TYPE_POINTER:
{
void *p = g_value_get_pointer( value );
return( g_direct_hash( p ) );
}
case G_TYPE_OBJECT:
{
void *p = g_value_get_object( value );
return( g_direct_hash( p ) );
}
default:
{
/* Fallback: convert to a string and hash that. This is very
* slow, print a warning if we use it so we can add another
* case.
*/
char *s;
unsigned int hash;
s = g_strdup_value_contents( value );
hash = g_str_hash( s );
printf( "vips_value_hash: no case for %s\n", s );
g_free( s );
return( hash );
}
}
}
static gboolean
vips_value_equal( GValue *v1, GValue *v2 )
{
GType t1 = G_VALUE_TYPE( v1 );
GType t2 = G_VALUE_TYPE( v2 );
if( t1 != t2 )
return( FALSE );
switch( t1 ) {
case G_TYPE_BOOLEAN:
return( g_value_get_boolean( v1 ) ==
g_value_get_boolean( v2 ) );
case G_TYPE_CHAR:
return( g_value_get_char( v1 ) ==
g_value_get_char( v2 ) );
case G_TYPE_UCHAR:
return( g_value_get_uchar( v1 ) ==
g_value_get_uchar( v2 ) );
case G_TYPE_INT:
return( g_value_get_int( v1 ) ==
g_value_get_int( v2 ) );
case G_TYPE_UINT:
return( g_value_get_uint( v1 ) ==
g_value_get_uint( v2 ) );
case G_TYPE_LONG:
return( g_value_get_long( v1 ) ==
g_value_get_long( v2 ) );
case G_TYPE_ULONG:
return( g_value_get_ulong( v1 ) ==
g_value_get_ulong( v2 ) );
case G_TYPE_ENUM:
return( g_value_get_enum( v1 ) ==
g_value_get_enum( v2 ) );
case G_TYPE_FLAGS:
return( g_value_get_flags( v1 ) ==
g_value_get_flags( v2 ) );
case G_TYPE_UINT64:
return( g_value_get_uint64( v1 ) ==
g_value_get_uint64( v2 ) );
case G_TYPE_INT64:
return( g_value_get_int64( v1 ) ==
g_value_get_int64( v2 ) );
case G_TYPE_FLOAT:
return( g_value_get_float( v1 ) ==
g_value_get_float( v2 ) );
case G_TYPE_DOUBLE:
return( g_value_get_double( v1 ) ==
g_value_get_double( v2 ) );
case G_TYPE_STRING:
return( strcmp( g_value_get_string( v1 ),
g_value_get_string( v2 ) ) == 0 );
case G_TYPE_BOXED:
return( g_value_get_boxed( v1 ) ==
g_value_get_boxed( v2 ) );
case G_TYPE_POINTER:
return( g_value_get_pointer( v1 ) ==
g_value_get_pointer( v2 ) );
case G_TYPE_OBJECT:
return( g_value_get_object( v1 ) ==
g_value_get_object( v2 ) );
default:
{
/* Fallback: convert to a string and hash that. This is very
* slow, print a warning if we use it so we can add another
* case.
*/
char *s1;
char *s2;
gboolean equal;
s1 = g_strdup_value_contents( v1 );
s2 = g_strdup_value_contents( v2 );
equal = strcmp( s1, s2 ) == 0;
g_free( s1 );
g_free( s2 );
return( equal );
}
}
}
static void *
vips_cache_hash_arg( VipsObject *object,
GParamSpec *pspec,
VipsArgumentClass *argument_class,
VipsArgumentInstance *argument_instance,
void *a, void *b )
{
unsigned int *hash = (unsigned int *) a;
if( (argument_class->flags & VIPS_ARGUMENT_CONSTRUCT) &&
argument_instance->assigned ) {
GType type = G_PARAM_SPEC_VALUE_TYPE( pspec );
GValue value = { 0, };
g_value_init( &value, type );
g_object_get_property( G_OBJECT( object ),
g_param_spec_get_name( pspec ), &value );
*hash = (*hash << 1) ^ vips_value_hash( &value );
g_value_unset( &value );
}
return( NULL );
}
/* Find a hash from the input arguments.
*/
static unsigned int
vips_cache_hash( VipsCacheItem *item )
{
if( !item->found_hash ) {
unsigned int hash;
hash = 0;
(void) vips_argument_map( item->object,
vips_cache_hash_arg, &hash, NULL );
item->hash = hash;
item->found_hash = TRUE;
}
return( item->hash );
}
static void *
vips_cache_equal_arg( VipsObject *object,
GParamSpec *pspec,
VipsArgumentClass *argument_class,
VipsArgumentInstance *argument_instance,
void *a, void *b )
{
VipsObject *other = (VipsObject *) a;
if( (argument_class->flags & VIPS_ARGUMENT_CONSTRUCT) &&
argument_instance->assigned ) {
const char *name = g_param_spec_get_name( pspec );
GType type = G_PARAM_SPEC_VALUE_TYPE( pspec );
GValue v1 = { 0, };
GValue v2 = { 0, };
gboolean equal;
g_value_init( &v1, type );
g_value_init( &v2, type );
g_object_get_property( G_OBJECT( object ), name, &v1 );
g_object_get_property( G_OBJECT( other ), name, &v2 );
equal = vips_value_equal( &v1, &v2 );
g_value_unset( &v1 );
g_value_unset( &v2 );
if( !equal )
return( object );
}
return( NULL );
}
/* Are two cache items equal.
*/
static gboolean
vips_cache_equal( VipsCacheItem *a, VipsCacheItem *b )
{
if( G_OBJECT_TYPE( a->object ) == G_OBJECT_TYPE( b->object ) &&
vips_cache_hash( a ) == vips_cache_hash( b ) &&
!vips_argument_map( a->object,
vips_cache_equal_arg, b->object, NULL ) )
return( TRUE );
return( FALSE );
}
static void
vips_cache_remove( void *data, GObject *object )
{
VIPS_DEBUG_MSG( "vips_cache_remove: removing %p\n", object );
if( !g_hash_table_remove( vips_object_cache, object ) )
g_assert( 0 );
}
/* Look up an object in the cache. If we get a hit, unref the new one, ref the
* old one and return that. If we miss, add this object and a weakref so we
* will drop it when it's unreffed.
*/
VipsObject *
vips_cache_lookup( VipsObject *object )
{
VipsObject *hit;
if( !vips_object_cache )
vips_object_cache = g_hash_table_new(
(GHashFunc) vips_cache_hash,
(GEqualFunc) vips_cache_equal );
if( (hit = g_hash_table_lookup( vips_object_cache, object )) ) {
VIPS_DEBUG_MSG( "vips_cache_lookup: hit for %p\n", hit );
g_object_unref( object );
g_object_ref( hit );
return( hit );
}
else {
VIPS_DEBUG_MSG( "vips_cache_lookup: adding %p\n", object );
g_hash_table_insert( vips_object_cache, object, object );
g_object_weak_ref( G_OBJECT( object ),
vips_cache_remove, NULL );
return( object );
}
}