mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-11-25 02:53:48 +08:00
5f6e90a0ce
This changes DECLARE_REGISTRY to add a type-safe interface. This interface is a C++ class that handles the details of registering a key, and provides various useful methods, including policy-based cleanup. gdb/ChangeLog 2019-05-08 Tom Tromey <tom@tromey.com> * registry.h (DECLARE_REGISTRY): Define the _key class.
310 lines
10 KiB
C++
310 lines
10 KiB
C++
/* Macros for general registry objects.
|
|
|
|
Copyright (C) 2011-2019 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
|
|
|
|
#include <type_traits>
|
|
|
|
/* The macros here implement a template type and functions for
|
|
associating some user data with a container object.
|
|
|
|
A registry is associated with a struct tag name. To attach a
|
|
registry to a structure, use DEFINE_REGISTRY. This takes the
|
|
structure tag and an access method as arguments. In the usual
|
|
case, where the registry fields appear directly in the struct, you
|
|
can use the 'REGISTRY_FIELDS' macro to declare the fields in the
|
|
struct definition, and you can pass 'REGISTRY_ACCESS_FIELD' as the
|
|
access argument to DEFINE_REGISTRY. In other cases, use
|
|
REGISTRY_FIELDS to define the fields in the appropriate spot, and
|
|
then define your own accessor to find the registry field structure
|
|
given an instance of your type.
|
|
|
|
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.
|
|
|
|
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 *object, void *data)
|
|
When the container object OBJECT is destroyed, first all registered SAVE
|
|
functions are called.
|
|
Then all FREE functions are called.
|
|
Either or both may be NULL. DATA is the data associated with the
|
|
container object OBJECT.
|
|
|
|
- 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 structure is used in a container to hold the data that the
|
|
registry uses. */
|
|
|
|
struct registry_fields
|
|
{
|
|
void **data;
|
|
unsigned num_data;
|
|
};
|
|
|
|
/* This macro is used in a container struct definition to define the
|
|
fields used by the registry code. */
|
|
|
|
#define REGISTRY_FIELDS \
|
|
struct registry_fields registry_data
|
|
|
|
/* A convenience macro for the typical case where the registry data is
|
|
kept as fields of the object. This can be passed as the ACCESS
|
|
method to DEFINE_REGISTRY. */
|
|
|
|
#define REGISTRY_ACCESS_FIELD(CONTAINER) \
|
|
(CONTAINER)
|
|
|
|
/* Opaque type representing a container type with a registry. This
|
|
type is never defined. This is used to factor out common
|
|
functionality of all struct tag names into common code. IOW,
|
|
"struct tag name" pointers are cast to and from "struct
|
|
registry_container" pointers when calling the common registry
|
|
"backend" functions. */
|
|
struct registry_container;
|
|
|
|
/* Registry callbacks have this type. */
|
|
typedef void (*registry_data_callback) (struct registry_container *, void *);
|
|
|
|
struct registry_data
|
|
{
|
|
unsigned index;
|
|
registry_data_callback save;
|
|
registry_data_callback free;
|
|
};
|
|
|
|
struct registry_data_registration
|
|
{
|
|
struct registry_data *data;
|
|
struct registry_data_registration *next;
|
|
};
|
|
|
|
struct registry_data_registry
|
|
{
|
|
struct registry_data_registration *registrations;
|
|
unsigned num_registrations;
|
|
};
|
|
|
|
/* Registry backend functions. Client code uses the frontend
|
|
functions defined by DEFINE_REGISTRY below instead. */
|
|
|
|
const struct registry_data *register_data_with_cleanup
|
|
(struct registry_data_registry *registry,
|
|
registry_data_callback save,
|
|
registry_data_callback free);
|
|
|
|
void registry_alloc_data (struct registry_data_registry *registry,
|
|
struct registry_fields *registry_fields);
|
|
|
|
/* Cast FUNC and CONTAINER to the real types, and call FUNC, also
|
|
passing DATA. */
|
|
typedef void (*registry_callback_adaptor) (registry_data_callback func,
|
|
struct registry_container *container,
|
|
void *data);
|
|
|
|
void registry_clear_data (struct registry_data_registry *data_registry,
|
|
registry_callback_adaptor adaptor,
|
|
struct registry_container *container,
|
|
struct registry_fields *fields);
|
|
|
|
void registry_container_free_data (struct registry_data_registry *data_registry,
|
|
registry_callback_adaptor adaptor,
|
|
struct registry_container *container,
|
|
struct registry_fields *fields);
|
|
|
|
void registry_set_data (struct registry_fields *fields,
|
|
const struct registry_data *data,
|
|
void *value);
|
|
|
|
void *registry_data (struct registry_fields *fields,
|
|
const struct registry_data *data);
|
|
|
|
/* Define a new registry implementation. */
|
|
|
|
#define DEFINE_REGISTRY(TAG, ACCESS) \
|
|
struct registry_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 *)) \
|
|
{ \
|
|
return (struct TAG ## _data *) \
|
|
register_data_with_cleanup (&TAG ## _data_registry, \
|
|
(registry_data_callback) save, \
|
|
(registry_data_callback) free); \
|
|
} \
|
|
\
|
|
const struct TAG ## _data * \
|
|
register_ ## TAG ## _data (void) \
|
|
{ \
|
|
return register_ ## TAG ## _data_with_cleanup (NULL, NULL); \
|
|
} \
|
|
\
|
|
static void \
|
|
TAG ## _alloc_data (struct TAG *container) \
|
|
{ \
|
|
struct registry_fields *rdata = &ACCESS (container)->registry_data; \
|
|
\
|
|
registry_alloc_data (&TAG ## _data_registry, rdata); \
|
|
} \
|
|
\
|
|
static void \
|
|
TAG ## registry_callback_adaptor (registry_data_callback func, \
|
|
struct registry_container *container, \
|
|
void *data) \
|
|
{ \
|
|
struct TAG *tagged_container = (struct TAG *) container; \
|
|
\
|
|
registry_ ## TAG ## _callback tagged_func \
|
|
= (registry_ ## TAG ## _callback) func; \
|
|
\
|
|
tagged_func (tagged_container, data); \
|
|
} \
|
|
\
|
|
void \
|
|
clear_ ## TAG ## _data (struct TAG *container) \
|
|
{ \
|
|
struct registry_fields *rdata = &ACCESS (container)->registry_data; \
|
|
\
|
|
registry_clear_data (&TAG ## _data_registry, \
|
|
TAG ## registry_callback_adaptor, \
|
|
(struct registry_container *) container, \
|
|
rdata); \
|
|
} \
|
|
\
|
|
static void \
|
|
TAG ## _free_data (struct TAG *container) \
|
|
{ \
|
|
struct registry_fields *rdata = &ACCESS (container)->registry_data; \
|
|
\
|
|
registry_container_free_data (&TAG ## _data_registry, \
|
|
TAG ## registry_callback_adaptor, \
|
|
(struct registry_container *) container, \
|
|
rdata); \
|
|
} \
|
|
\
|
|
void \
|
|
set_ ## TAG ## _data (struct TAG *container, \
|
|
const struct TAG ## _data *data, \
|
|
void *value) \
|
|
{ \
|
|
struct registry_fields *rdata = &ACCESS (container)->registry_data; \
|
|
\
|
|
registry_set_data (rdata, \
|
|
(struct registry_data *) data, \
|
|
value); \
|
|
} \
|
|
\
|
|
void * \
|
|
TAG ## _data (struct TAG *container, const struct TAG ## _data *data) \
|
|
{ \
|
|
struct registry_fields *rdata = &ACCESS (container)->registry_data; \
|
|
\
|
|
return registry_data (rdata, \
|
|
(struct registry_data *) data); \
|
|
}
|
|
|
|
|
|
/* External declarations for the registry functions. */
|
|
|
|
#define DECLARE_REGISTRY(TAG) \
|
|
struct TAG ## _data; \
|
|
typedef void (*registry_ ## TAG ## _callback) (struct TAG *, void *); \
|
|
extern const struct TAG ## _data *register_ ## TAG ## _data (void); \
|
|
extern const struct TAG ## _data *register_ ## TAG ## _data_with_cleanup \
|
|
(registry_ ## TAG ## _callback save, registry_ ## TAG ## _callback free); \
|
|
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); \
|
|
\
|
|
template<typename DATA, typename Deleter = std::default_delete<DATA>> \
|
|
class TAG ## _key \
|
|
{ \
|
|
public: \
|
|
\
|
|
TAG ## _key () \
|
|
: m_key (register_ ## TAG ## _data_with_cleanup (nullptr, \
|
|
cleanup)) \
|
|
{ \
|
|
} \
|
|
\
|
|
DATA *get (struct TAG *obj) const \
|
|
{ \
|
|
return (DATA *) TAG ## _data (obj, m_key); \
|
|
} \
|
|
\
|
|
void set (struct TAG *obj, DATA *data) const \
|
|
{ \
|
|
set_ ## TAG ## _data (obj, m_key, data); \
|
|
} \
|
|
\
|
|
template<typename Dummy = DATA *, typename... Args> \
|
|
typename std::enable_if<std::is_same<Deleter, \
|
|
std::default_delete<DATA>>::value, \
|
|
Dummy>::type \
|
|
emplace (struct TAG *obj, Args &&...args) const \
|
|
{ \
|
|
DATA *result = new DATA (std::forward<Args> (args)...); \
|
|
set (obj, result); \
|
|
return result; \
|
|
} \
|
|
\
|
|
void clear (struct TAG *obj) const \
|
|
{ \
|
|
DATA *datum = get (obj); \
|
|
if (datum != nullptr) \
|
|
{ \
|
|
cleanup (obj, datum); \
|
|
set (obj, nullptr); \
|
|
} \
|
|
} \
|
|
\
|
|
private: \
|
|
\
|
|
static void cleanup (struct TAG *obj, void *arg) \
|
|
{ \
|
|
DATA *datum = (DATA *) arg; \
|
|
Deleter d; \
|
|
d (datum); \
|
|
} \
|
|
\
|
|
const struct TAG ## _data *m_key; \
|
|
};
|
|
|
|
#endif /* REGISTRY_H */
|