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310 lines
10 KiB
C++
310 lines
10 KiB
C++
/* Macros for general registry objects.
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Copyright (C) 2011-2020 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef REGISTRY_H
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#define REGISTRY_H
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#include <type_traits>
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/* The macros here implement a template type and functions for
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associating some user data with a container object.
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A registry is associated with a struct tag name. To attach a
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registry to a structure, use DEFINE_REGISTRY. This takes the
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structure tag and an access method as arguments. In the usual
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case, where the registry fields appear directly in the struct, you
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can use the 'REGISTRY_FIELDS' macro to declare the fields in the
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struct definition, and you can pass 'REGISTRY_ACCESS_FIELD' as the
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access argument to DEFINE_REGISTRY. In other cases, use
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REGISTRY_FIELDS to define the fields in the appropriate spot, and
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then define your own accessor to find the registry field structure
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given an instance of your type.
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The API user requests a key from a registry during gdb
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initialization. Later this key can be used to associate some
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module-specific data with a specific container object.
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The exported API is best used via the wrapper macros:
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- register_TAG_data(TAG)
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Get a new key for the container type TAG.
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- register_TAG_data_with_cleanup(TAG, SAVE, FREE)
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Get a new key for the container type TAG.
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SAVE and FREE are defined as void (*) (struct TAG *object, void *data)
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When the container object OBJECT is destroyed, first all registered SAVE
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functions are called.
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Then all FREE functions are called.
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Either or both may be NULL. DATA is the data associated with the
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container object OBJECT.
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- clear_TAG_data(TAG, OBJECT)
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Clear all the data associated with OBJECT. Should be called by the
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container implementation when a container object is destroyed.
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- set_TAG_data(TAG, OBJECT, KEY, DATA)
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Set the data on an object.
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- TAG_data(TAG, OBJECT, KEY)
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Fetch the data for an object; returns NULL if it has not been set.
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*/
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/* This structure is used in a container to hold the data that the
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registry uses. */
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struct registry_fields
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{
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void **data;
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unsigned num_data;
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};
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/* This macro is used in a container struct definition to define the
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fields used by the registry code. */
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#define REGISTRY_FIELDS \
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struct registry_fields registry_data
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/* A convenience macro for the typical case where the registry data is
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kept as fields of the object. This can be passed as the ACCESS
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method to DEFINE_REGISTRY. */
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#define REGISTRY_ACCESS_FIELD(CONTAINER) \
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(CONTAINER)
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/* Opaque type representing a container type with a registry. This
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type is never defined. This is used to factor out common
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functionality of all struct tag names into common code. IOW,
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"struct tag name" pointers are cast to and from "struct
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registry_container" pointers when calling the common registry
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"backend" functions. */
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struct registry_container;
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/* Registry callbacks have this type. */
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typedef void (*registry_data_callback) (struct registry_container *, void *);
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struct registry_data
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{
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unsigned index;
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registry_data_callback save;
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registry_data_callback free;
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};
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struct registry_data_registration
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{
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struct registry_data *data;
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struct registry_data_registration *next;
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};
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struct registry_data_registry
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{
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struct registry_data_registration *registrations;
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unsigned num_registrations;
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};
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/* Registry backend functions. Client code uses the frontend
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functions defined by DEFINE_REGISTRY below instead. */
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const struct registry_data *register_data_with_cleanup
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(struct registry_data_registry *registry,
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registry_data_callback save,
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registry_data_callback free);
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void registry_alloc_data (struct registry_data_registry *registry,
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struct registry_fields *registry_fields);
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/* Cast FUNC and CONTAINER to the real types, and call FUNC, also
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passing DATA. */
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typedef void (*registry_callback_adaptor) (registry_data_callback func,
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struct registry_container *container,
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void *data);
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void registry_clear_data (struct registry_data_registry *data_registry,
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registry_callback_adaptor adaptor,
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struct registry_container *container,
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struct registry_fields *fields);
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void registry_container_free_data (struct registry_data_registry *data_registry,
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registry_callback_adaptor adaptor,
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struct registry_container *container,
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struct registry_fields *fields);
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void registry_set_data (struct registry_fields *fields,
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const struct registry_data *data,
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void *value);
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void *registry_data (struct registry_fields *fields,
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const struct registry_data *data);
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/* Define a new registry implementation. */
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#define DEFINE_REGISTRY(TAG, ACCESS) \
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struct registry_data_registry TAG ## _data_registry = { NULL, 0 }; \
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\
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const struct TAG ## _data * \
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register_ ## TAG ## _data_with_cleanup (void (*save) (struct TAG *, void *), \
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void (*free) (struct TAG *, void *)) \
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{ \
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return (struct TAG ## _data *) \
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register_data_with_cleanup (&TAG ## _data_registry, \
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(registry_data_callback) save, \
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(registry_data_callback) free); \
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} \
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\
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const struct TAG ## _data * \
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register_ ## TAG ## _data (void) \
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{ \
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return register_ ## TAG ## _data_with_cleanup (NULL, NULL); \
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} \
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\
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static void \
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TAG ## _alloc_data (struct TAG *container) \
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{ \
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struct registry_fields *rdata = &ACCESS (container)->registry_data; \
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\
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registry_alloc_data (&TAG ## _data_registry, rdata); \
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} \
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\
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static void \
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TAG ## registry_callback_adaptor (registry_data_callback func, \
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struct registry_container *container, \
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void *data) \
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{ \
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struct TAG *tagged_container = (struct TAG *) container; \
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\
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registry_ ## TAG ## _callback tagged_func \
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= (registry_ ## TAG ## _callback) func; \
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\
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tagged_func (tagged_container, data); \
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} \
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\
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void \
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clear_ ## TAG ## _data (struct TAG *container) \
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{ \
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struct registry_fields *rdata = &ACCESS (container)->registry_data; \
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\
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registry_clear_data (&TAG ## _data_registry, \
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TAG ## registry_callback_adaptor, \
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(struct registry_container *) container, \
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rdata); \
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} \
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\
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static void \
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TAG ## _free_data (struct TAG *container) \
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{ \
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struct registry_fields *rdata = &ACCESS (container)->registry_data; \
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\
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registry_container_free_data (&TAG ## _data_registry, \
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TAG ## registry_callback_adaptor, \
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(struct registry_container *) container, \
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rdata); \
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} \
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\
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void \
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set_ ## TAG ## _data (struct TAG *container, \
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const struct TAG ## _data *data, \
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void *value) \
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{ \
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struct registry_fields *rdata = &ACCESS (container)->registry_data; \
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\
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registry_set_data (rdata, \
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(struct registry_data *) data, \
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value); \
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} \
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\
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void * \
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TAG ## _data (struct TAG *container, const struct TAG ## _data *data) \
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{ \
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struct registry_fields *rdata = &ACCESS (container)->registry_data; \
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\
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return registry_data (rdata, \
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(struct registry_data *) data); \
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}
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/* External declarations for the registry functions. */
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#define DECLARE_REGISTRY(TAG) \
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struct TAG ## _data; \
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typedef void (*registry_ ## TAG ## _callback) (struct TAG *, void *); \
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extern const struct TAG ## _data *register_ ## TAG ## _data (void); \
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extern const struct TAG ## _data *register_ ## TAG ## _data_with_cleanup \
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(registry_ ## TAG ## _callback save, registry_ ## TAG ## _callback free); \
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extern void clear_ ## TAG ## _data (struct TAG *); \
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extern void set_ ## TAG ## _data (struct TAG *, \
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const struct TAG ## _data *data, \
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void *value); \
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extern void *TAG ## _data (struct TAG *, \
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const struct TAG ## _data *data); \
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\
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template<typename DATA, typename Deleter = std::default_delete<DATA>> \
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class TAG ## _key \
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{ \
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public: \
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\
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TAG ## _key () \
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: m_key (register_ ## TAG ## _data_with_cleanup (nullptr, \
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cleanup)) \
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{ \
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} \
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\
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DATA *get (struct TAG *obj) const \
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{ \
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return (DATA *) TAG ## _data (obj, m_key); \
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} \
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\
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void set (struct TAG *obj, DATA *data) const \
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{ \
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set_ ## TAG ## _data (obj, m_key, data); \
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} \
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\
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template<typename Dummy = DATA *, typename... Args> \
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typename std::enable_if<std::is_same<Deleter, \
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std::default_delete<DATA>>::value, \
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Dummy>::type \
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emplace (struct TAG *obj, Args &&...args) const \
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{ \
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DATA *result = new DATA (std::forward<Args> (args)...); \
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set (obj, result); \
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return result; \
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} \
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\
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void clear (struct TAG *obj) const \
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{ \
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DATA *datum = get (obj); \
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if (datum != nullptr) \
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{ \
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cleanup (obj, datum); \
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set (obj, nullptr); \
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} \
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} \
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\
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private: \
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\
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static void cleanup (struct TAG *obj, void *arg) \
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{ \
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DATA *datum = (DATA *) arg; \
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Deleter d; \
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d (datum); \
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} \
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\
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const struct TAG ## _data *m_key; \
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};
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#endif /* REGISTRY_H */
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