[lttng-ust.git] / src / common / macros.h

/*
 * SPDX-License-Identifier: LGPL-2.1-only
 *
 * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 */

#ifndef _UST_COMMON_MACROS_H
#define _UST_COMMON_MACROS_H

#include <stdlib.h>
#include <stdbool.h>
#include <string.h>

#include <lttng/ust-arch.h>

/*
 * calloc() does not always populate the page table for the allocated
 * memory. Optionally enforce page table populate.
 */
static inline
void *zmalloc_populate(size_t len, bool populate)
	__attribute__((always_inline));
static inline
void *zmalloc_populate(size_t len, bool populate)
{
	if (populate) {
		void *ret = malloc(len);
		if (ret == NULL)
			return ret;
		bzero(ret, len);
		return ret;
	} else {
		return calloc(len, 1);
	}
}

/*
 * Memory allocation zeroed
 */
static inline
void *zmalloc(size_t len)
	__attribute__((always_inline));
static inline
void *zmalloc(size_t len)
{
	return zmalloc_populate(len, false);
}

#define max_t(type, x, y)				\
	({						\
		type __max1 = (x);              	\
		type __max2 = (y);              	\
		__max1 > __max2 ? __max1: __max2;	\
	})

#define min_t(type, x, y)				\
	({						\
		type __min1 = (x);              	\
		type __min2 = (y);              	\
		__min1 <= __min2 ? __min1: __min2;	\
	})

#define LTTNG_ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))

/*
 * Use of __builtin_return_address(0) sometimes seems to cause stack
 * corruption on 32-bit PowerPC. Disable this feature on that
 * architecture for now by always using the NULL value for the ip
 * context.
 */
#if defined(LTTNG_UST_ARCH_PPC) && !defined(LTTNG_UST_ARCH_PPC64)
#define LTTNG_UST_CALLER_IP()		NULL
#else
#define LTTNG_UST_CALLER_IP()		__builtin_return_address(0)
#endif

#endif /* _UST_COMMON_MACROS_H */
Commit	Line	Data
	1	/*
	2	* SPDX-License-Identifier: LGPL-2.1-only
	3	*
	4	* Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
	5	*/
	6
	7	#ifndef _UST_COMMON_MACROS_H
	8	#define _UST_COMMON_MACROS_H
	9
	10	#include <stdlib.h>
	11	#include <stdbool.h>
	12	#include <string.h>
	13
	14	#include <lttng/ust-arch.h>
	15
	16	/*
	17	* calloc() does not always populate the page table for the allocated
	18	* memory. Optionally enforce page table populate.
	19	*/
	20	static inline
	21	void *zmalloc_populate(size_t len, bool populate)
	22	__attribute__((always_inline));
	23	static inline
	24	void *zmalloc_populate(size_t len, bool populate)
	25	{
	26	if (populate) {
	27	void *ret = malloc(len);
	28	if (ret == NULL)
	29	return ret;
	30	bzero(ret, len);
	31	return ret;
	32	} else {
	33	return calloc(len, 1);
	34	}
	35	}
	36
	37	/*
	38	* Memory allocation zeroed
	39	*/
	40	static inline
	41	void *zmalloc(size_t len)
	42	__attribute__((always_inline));
	43	static inline
	44	void *zmalloc(size_t len)
	45	{
	46	return zmalloc_populate(len, false);
	47	}
	48
	49	#define max_t(type, x, y) \
	50	({ \
	51	type __max1 = (x); \
	52	type __max2 = (y); \
	53	__max1 > __max2 ? __max1: __max2; \
	54	})
	55
	56	#define min_t(type, x, y) \
	57	({ \
	58	type __min1 = (x); \
	59	type __min2 = (y); \
	60	__min1 <= __min2 ? __min1: __min2; \
	61	})
	62
	63	#define LTTNG_ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
	64
	65	/*
	66	* Use of __builtin_return_address(0) sometimes seems to cause stack
	67	* corruption on 32-bit PowerPC. Disable this feature on that
	68	* architecture for now by always using the NULL value for the ip
	69	* context.
	70	*/
	71	#if defined(LTTNG_UST_ARCH_PPC) && !defined(LTTNG_UST_ARCH_PPC64)
	72	#define LTTNG_UST_CALLER_IP() NULL
	73	#else
	74	#define LTTNG_UST_CALLER_IP() __builtin_return_address(0)
	75	#endif
	76
	77	#endif /* _UST_COMMON_MACROS_H */