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Diffstat (limited to 'gdb/registry.h')
| -rw-r--r-- | gdb/registry.h | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/gdb/registry.h b/gdb/registry.h new file mode 100644 index 0000000..d696781 --- /dev/null +++ b/gdb/registry.h @@ -0,0 +1,187 @@ +/* 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 */ |