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/*
* qpb_allocator.h
*
* @copyright Copyright (C) 2016 Sproute Networks, Inc.
*
* @author Avneesh Sachdev <avneesh@sproute.com>
*
* This file is part of Quagga.
*
* Quagga 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 2, or (at your option) any
* later version.
*
* Quagga 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 Quagga; see the file COPYING. If not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
/*
* Header file for Quagga/FRR protobuf memory management code.
*/
#ifndef _QPB_ALLOCATOR_H_
#define _QPB_ALLOCATOR_H_
#include <google/protobuf-c/protobuf-c.h>
struct linear_allocator_t_;
/*
* Alias for ProtobufCAllocator that is easier on the fingers.
*/
typedef ProtobufCAllocator qpb_allocator_t;
/*
* qpb_alloc
*/
static inline void *
qpb_alloc (qpb_allocator_t *allocator, size_t size)
{
return allocator->alloc (allocator->allocator_data, size);
}
/*
* qpb_alloc_ptr_array
*
* Allocate space for the specified number of pointers.
*/
static inline void *
qpb_alloc_ptr_array (qpb_allocator_t *allocator, size_t num_ptrs)
{
return qpb_alloc (allocator, num_ptrs * sizeof (void *));
}
/*
* qpb_free
*/
static inline void
qpb_free (qpb_allocator_t *allocator, void *ptr)
{
allocator->free (allocator->allocator_data, ptr);
}
/*
* QPB_ALLOC
*
* Convenience macro to reduce the probability of allocating memory of
* incorrect size. It returns enough memory to store the given type,
* and evaluates to an appropriately typed pointer.
*/
#define QPB_ALLOC(allocator, type) \
(type *) qpb_alloc(allocator, sizeof(type))
/*
* Externs.
*/
extern void qpb_allocator_init_linear (qpb_allocator_t *,
struct linear_allocator_t_ *);
/*
* The following macros are for the common case where a qpb allocator
* is being used alongside a linear allocator that allocates memory
* off of the stack.
*/
#define QPB_DECLARE_STACK_ALLOCATOR(allocator, size) \
qpb_allocator_t allocator; \
linear_allocator_t lin_ ## allocator; \
char lin_ ## allocator ## _buf[size]
#define QPB_INIT_STACK_ALLOCATOR(allocator) \
do \
{ \
linear_allocator_init(&(lin_ ## allocator), \
lin_ ## allocator ## _buf, \
sizeof(lin_ ## allocator ## _buf)); \
qpb_allocator_init_linear(&allocator, &(lin_ ## allocator)); \
} while (0)
#define QPB_RESET_STACK_ALLOCATOR(allocator) \
do \
{ \
linear_allocator_reset (&(lin_ ## allocator)); \
} while (0)
#endif /* _QPB_ALLOCATOR_H_ */
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