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/* Macros for general registry objects.
Copyright (C) 2011, 2012
Free Software Foundation, Inc.
This file is part of GDB.
This program 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 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#ifndef REGISTRY_H
#define REGISTRY_H
/* The macros here implement a template type and functions for
associating some user data with a container object.
The API user requests a key from a registry during gdb
initialization. Later this key can be used to associate some
module-specific data with a specific container object.
A registry is associated with a struct tag name.
The exported API is best used via the wrapper macros:
- register_TAG_data(TAG)
Get a new key for the container type TAG.
- register_TAG_data_with_cleanup(TAG, SAVE, FREE)
Get a new key for the container type TAG.
SAVE and FREE are defined as void (*) (struct TAG *, void *)
When the container is destroyed, first all registered SAVE
functions are called.
Then all FREE functions are called.
Either or both may be NULL.
- clear_TAG_data(TAG, OBJECT)
Clear all the data associated with OBJECT. Should be called by the
container implementation when a container object is destroyed.
- set_TAG_data(TAG, OBJECT, KEY, DATA)
Set the data on an object.
- TAG_data(TAG, OBJECT, KEY)
Fetch the data for an object; returns NULL if it has not been set.
*/
/* This macro is used in a container struct definition to define the
fields used by the registry code. */
#define REGISTRY_FIELDS \
void **data; \
unsigned num_data
/* Define a new registry implementation. */
#define DEFINE_REGISTRY(TAG) \
struct TAG ## _data \
{ \
unsigned index; \
void (*save) (struct TAG *, void *); \
void (*free) (struct TAG *, void *); \
}; \
\
struct TAG ## _data_registration \
{ \
struct TAG ## _data *data; \
struct TAG ## _data_registration *next; \
}; \
\
struct TAG ## _data_registry \
{ \
struct TAG ## _data_registration *registrations; \
unsigned num_registrations; \
}; \
\
struct TAG ## _data_registry TAG ## _data_registry = { NULL, 0 }; \
\
const struct TAG ## _data * \
register_ ## TAG ## _data_with_cleanup (void (*save) (struct TAG *, void *), \
void (*free) (struct TAG *, void *)) \
{ \
struct TAG ## _data_registration **curr; \
\
/* Append new registration. */ \
for (curr = &TAG ## _data_registry.registrations; \
*curr != NULL; curr = &(*curr)->next); \
\
*curr = XMALLOC (struct TAG ## _data_registration); \
(*curr)->next = NULL; \
(*curr)->data = XMALLOC (struct TAG ## _data); \
(*curr)->data->index = TAG ## _data_registry.num_registrations++; \
(*curr)->data->save = save; \
(*curr)->data->free = free; \
\
return (*curr)->data; \
} \
\
const struct TAG ## _data * \
register_ ## TAG ## _data (void) \
{ \
return register_ ## TAG ## _data_with_cleanup (NULL, NULL); \
} \
\
static void \
TAG ## _alloc_data (struct TAG *container) \
{ \
gdb_assert (container->data == NULL); \
container->num_data = TAG ## _data_registry.num_registrations; \
container->data = XCALLOC (container->num_data, void *); \
} \
\
void \
clear_ ## TAG ## _data (struct TAG *container) \
{ \
struct TAG ## _data_registration *registration; \
int i; \
\
gdb_assert (container->data != NULL); \
\
/* Process all the save handlers. */ \
\
for (registration = TAG ## _data_registry.registrations, i = 0; \
i < container->num_data; \
registration = registration->next, i++) \
if (container->data[i] != NULL && registration->data->save != NULL) \
registration->data->save (container, container->data[i]); \
\
/* Now process all the free handlers. */ \
\
for (registration = TAG ## _data_registry.registrations, i = 0; \
i < container->num_data; \
registration = registration->next, i++) \
if (container->data[i] != NULL && registration->data->free != NULL) \
registration->data->free (container, container->data[i]); \
\
memset (container->data, 0, container->num_data * sizeof (void *)); \
} \
\
static void \
TAG ## _free_data (struct TAG *container) \
{ \
void ***rdata = &container->data; \
gdb_assert (*rdata != NULL); \
clear_ ## TAG ## _data (container); \
xfree (*rdata); \
*rdata = NULL; \
} \
\
void \
set_ ## TAG ## _data (struct TAG *container, const struct TAG ## _data *data, \
void *value) \
{ \
gdb_assert (data->index < container->num_data); \
container->data[data->index] = value; \
} \
\
void * \
TAG ## _data (struct TAG *container, const struct TAG ## _data *data) \
{ \
gdb_assert (data->index < container->num_data); \
return container->data[data->index]; \
}
/* External declarations for the registry functions. */
#define DECLARE_REGISTRY(TAG) \
extern const struct TAG ## _data *register_ ## TAG ## _data (void); \
extern const struct TAG ## _data *register_ ## TAG ## _data_with_cleanup \
(void (*save) (struct TAG *, void *), void (*free) (struct TAG *, void *)); \
extern void clear_ ## TAG ## _data (struct TAG *); \
extern void set_ ## TAG ## _data (struct TAG *, \
const struct TAG ## _data *data, void *value); \
extern void *TAG ## _data (struct TAG *, \
const struct TAG ## _data *data);
#endif /* REGISTRY_H */
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