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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* qpb_allocator.h
*
* @copyright Copyright (C) 2016 Sproute Networks, Inc.
*
* @author Avneesh Sachdev <avneesh@sproute.com>
*/
/*
* 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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