[babeltrace.git] / include / babeltrace / bitfield.h

#ifndef _BABELTRACE_BITFIELD_H
#define _BABELTRACE_BITFIELD_H

/*
 * BabelTrace
 *
 * Bitfields read/write functions.
 *
 * Copyright 2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <stdint.h>	/* C99 5.2.4.2 Numerical limits */
#include <limits.h>	/* C99 5.2.4.2 Numerical limits */
#include <assert.h>
#include <babeltrace/endian.h>	/* Non-standard BIG_ENDIAN, LITTLE_ENDIAN, BYTE_ORDER */

/* We can't shift a int from 32 bit, >> 32 and << 32 on int is undefined */
#define _bt_piecewise_rshift(_v, _shift)				\
({									\
	typeof(_v) ___v = (_v);						\
	typeof(_shift) ___shift = (_shift);				\
	unsigned long sb = (___shift) / (sizeof(___v) * CHAR_BIT - 1);	\
	unsigned long final = (___shift) % (sizeof(___v) * CHAR_BIT - 1); \
									\
	for (; sb; sb--)						\
		___v >>= sizeof(___v) * CHAR_BIT - 1;			\
	___v >>= final;							\
})

#define _bt_piecewise_lshift(_v, _shift)				\
({									\
	typeof(_v) ___v = (_v);						\
	typeof(_shift) ___shift = (_shift);				\
	unsigned long sb = (___shift) / (sizeof(___v) * CHAR_BIT - 1);	\
	unsigned long final = (___shift) % (sizeof(___v) * CHAR_BIT - 1); \
									\
	for (; sb; sb--)						\
		___v <<= sizeof(___v) * CHAR_BIT - 1;			\
	___v <<= final;							\
})

#define _bt_is_signed_type(type)	(((type)(-1)) < 0)

#define _bt_unsigned_cast(type, v)					\
({									\
	(sizeof(v) < sizeof(type)) ?					\
		((type) (v)) & (~(~(type) 0 << (sizeof(v) * CHAR_BIT))) : \
		(type) (v);						\
})

/*
 * bt_bitfield_write - write integer to a bitfield in native endianness
 *
 * Save integer to the bitfield, which starts at the "start" bit, has "len"
 * bits.
 * The inside of a bitfield is from high bits to low bits.
 * Uses native endianness.
 * For unsigned "v", pad MSB with 0 if bitfield is larger than v.
 * For signed "v", sign-extend v if bitfield is larger than v.
 *
 * On little endian, bytes are placed from the less significant to the most
 * significant. Also, consecutive bitfields are placed from lower bits to higher
 * bits.
 *
 * On big endian, bytes are places from most significant to less significant.
 * Also, consecutive bitfields are placed from higher to lower bits.
 */

#define _bt_bitfield_write_le(_ptr, type, _start, _length, _v)		\
do {									\
	typeof(_v) __v = (_v);						\
	type *__ptr = (void *) (_ptr);					\
	unsigned long __start = (_start), __length = (_length);		\
	type mask, cmask;						\
	unsigned long ts = sizeof(type) * CHAR_BIT; /* type size */	\
	unsigned long start_unit, end_unit, this_unit;			\
	unsigned long end, cshift; /* cshift is "complement shift" */	\
									\
	if (!__length)							\
		break;							\
									\
	end = __start + __length;					\
	start_unit = __start / ts;					\
	end_unit = (end + (ts - 1)) / ts;				\
									\
	/* Trim v high bits */						\
	if (__length < sizeof(__v) * CHAR_BIT)				\
		__v &= ~((~(typeof(__v)) 0) << __length);		\
									\
	/* We can now append v with a simple "or", shift it piece-wise */ \
	this_unit = start_unit;						\
	if (start_unit == end_unit - 1) {				\
		mask = ~((~(type) 0) << (__start % ts));		\
		if (end % ts)						\
			mask |= (~(type) 0) << (end % ts);		\
		cmask = (type) __v << (__start % ts);			\
		cmask &= ~mask;						\
		__ptr[this_unit] &= mask;				\
		__ptr[this_unit] |= cmask;				\
		break;							\
	}								\
	if (__start % ts) {						\
		cshift = __start % ts;					\
		mask = ~((~(type) 0) << cshift);			\
		cmask = (type) __v << cshift;				\
		cmask &= ~mask;						\
		__ptr[this_unit] &= mask;				\
		__ptr[this_unit] |= cmask;				\
		__v = _bt_piecewise_rshift(__v, ts - cshift);		\
		__start += ts - cshift;					\
		this_unit++;						\
	}								\
	for (; this_unit < end_unit - 1; this_unit++) {			\
		__ptr[this_unit] = (type) __v;				\
		__v = _bt_piecewise_rshift(__v, ts);			\
		__start += ts;						\
	}								\
	if (end % ts) {							\
		mask = (~(type) 0) << (end % ts);			\
		cmask = (type) __v;					\
		cmask &= ~mask;						\
		__ptr[this_unit] &= mask;				\
		__ptr[this_unit] |= cmask;				\
	} else								\
		__ptr[this_unit] = (type) __v;				\
} while (0)

#define _bt_bitfield_write_be(_ptr, type, _start, _length, _v)		\
do {									\
	typeof(_v) __v = (_v);						\
	type *__ptr = (void *) (_ptr);					\
	unsigned long __start = (_start), __length = (_length);		\
	type mask, cmask;						\
	unsigned long ts = sizeof(type) * CHAR_BIT; /* type size */	\
	unsigned long start_unit, end_unit, this_unit;			\
	unsigned long end, cshift; /* cshift is "complement shift" */	\
									\
	if (!__length)							\
		break;							\
									\
	end = __start + __length;					\
	start_unit = __start / ts;					\
	end_unit = (end + (ts - 1)) / ts;				\
									\
	/* Trim v high bits */						\
	if (__length < sizeof(__v) * CHAR_BIT)				\
		__v &= ~((~(typeof(__v)) 0) << __length);		\
									\
	/* We can now append v with a simple "or", shift it piece-wise */ \
	this_unit = end_unit - 1;					\
	if (start_unit == end_unit - 1) {				\
		mask = ~((~(type) 0) << ((ts - (end % ts)) % ts));	\
		if (__start % ts)					\
			mask |= (~((type) 0)) << (ts - (__start % ts));	\
		cmask = (type) __v << ((ts - (end % ts)) % ts);		\
		cmask &= ~mask;						\
		__ptr[this_unit] &= mask;				\
		__ptr[this_unit] |= cmask;				\
		break;							\
	}								\
	if (end % ts) {							\
		cshift = end % ts;					\
		mask = ~((~(type) 0) << (ts - cshift));			\
		cmask = (type) __v << (ts - cshift);			\
		cmask &= ~mask;						\
		__ptr[this_unit] &= mask;				\
		__ptr[this_unit] |= cmask;				\
		__v = _bt_piecewise_rshift(__v, cshift);		\
		end -= cshift;						\
		this_unit--;						\
	}								\
	for (; (long) this_unit >= (long) start_unit + 1; this_unit--) { \
		__ptr[this_unit] = (type) __v;				\
		__v = _bt_piecewise_rshift(__v, ts);			\
		end -= ts;						\
	}								\
	if (__start % ts) {						\
		mask = (~(type) 0) << (ts - (__start % ts));		\
		cmask = (type) __v;					\
		cmask &= ~mask;						\
		__ptr[this_unit] &= mask;				\
		__ptr[this_unit] |= cmask;				\
	} else								\
		__ptr[this_unit] = (type) __v;				\
} while (0)

/*
 * bt_bitfield_write - write integer to a bitfield in native endianness
 * bt_bitfield_write_le - write integer to a bitfield in little endian
 * bt_bitfield_write_be - write integer to a bitfield in big endian
 */

#if (BYTE_ORDER == LITTLE_ENDIAN)

#define bt_bitfield_write(ptr, type, _start, _length, _v)		\
	_bt_bitfield_write_le(ptr, type, _start, _length, _v)

#define bt_bitfield_write_le(ptr, type, _start, _length, _v)		\
	_bt_bitfield_write_le(ptr, type, _start, _length, _v)
	
#define bt_bitfield_write_be(ptr, type, _start, _length, _v)		\
	_bt_bitfield_write_be(ptr, unsigned char, _start, _length, _v)

#elif (BYTE_ORDER == BIG_ENDIAN)

#define bt_bitfield_write(ptr, type, _start, _length, _v)		\
	_bt_bitfield_write_be(ptr, type, _start, _length, _v)

#define bt_bitfield_write_le(ptr, type, _start, _length, _v)		\
	_bt_bitfield_write_le(ptr, unsigned char, _start, _length, _v)
	
#define bt_bitfield_write_be(ptr, type, _start, _length, _v)		\
	_bt_bitfield_write_be(ptr, type, _start, _length, _v)

#else /* (BYTE_ORDER == PDP_ENDIAN) */

#error "Byte order not supported"

#endif

#define _bt_bitfield_read_le(_ptr, type, _start, _length, _vptr)	\
do {									\
	typeof(*(_vptr)) *__vptr = (_vptr);				\
	typeof(*__vptr) __v;						\
	type *__ptr = (void *) (_ptr);					\
	unsigned long __start = (_start), __length = (_length);		\
	type mask, cmask;						\
	unsigned long ts = sizeof(type) * CHAR_BIT; /* type size */	\
	unsigned long start_unit, end_unit, this_unit;			\
	unsigned long end, cshift; /* cshift is "complement shift" */	\
									\
	if (!__length) {						\
		*__vptr = 0;						\
		break;							\
	}								\
									\
	end = __start + __length;					\
	start_unit = __start / ts;					\
	end_unit = (end + (ts - 1)) / ts;				\
									\
	this_unit = end_unit - 1;					\
	if (_bt_is_signed_type(typeof(__v))				\
	    && (__ptr[this_unit] & ((type) 1 << ((end % ts ? : ts) - 1)))) \
		__v = ~(typeof(__v)) 0;					\
	else								\
		__v = 0;						\
	if (start_unit == end_unit - 1) {				\
		cmask = __ptr[this_unit];				\
		cmask >>= (__start % ts);				\
		if ((end - __start) % ts) {				\
			mask = ~((~(type) 0) << (end - __start));	\
			cmask &= mask;					\
		}							\
		__v = _bt_piecewise_lshift(__v, end - __start);		\
		__v |= _bt_unsigned_cast(typeof(__v), cmask);		\
		*__vptr = __v;						\
		break;							\
	}								\
	if (end % ts) {							\
		cshift = end % ts;					\
		mask = ~((~(type) 0) << cshift);			\
		cmask = __ptr[this_unit];				\
		cmask &= mask;						\
		__v = _bt_piecewise_lshift(__v, cshift);		\
		__v |= _bt_unsigned_cast(typeof(__v), cmask);		\
		end -= cshift;						\
		this_unit--;						\
	}								\
	for (; (long) this_unit >= (long) start_unit + 1; this_unit--) { \
		__v = _bt_piecewise_lshift(__v, ts);			\
		__v |= _bt_unsigned_cast(typeof(__v), __ptr[this_unit]);\
		end -= ts;						\
	}								\
	if (__start % ts) {						\
		mask = ~((~(type) 0) << (ts - (__start % ts)));		\
		cmask = __ptr[this_unit];				\
		cmask >>= (__start % ts);				\
		cmask &= mask;						\
		__v = _bt_piecewise_lshift(__v, ts - (__start % ts));	\
		__v |= _bt_unsigned_cast(typeof(__v), cmask);		\
	} else {							\
		__v = _bt_piecewise_lshift(__v, ts);			\
		__v |= _bt_unsigned_cast(typeof(__v), __ptr[this_unit]);\
	}								\
	*__vptr = __v;							\
} while (0)

#define _bt_bitfield_read_be(_ptr, type, _start, _length, _vptr)	\
do {									\
	typeof(*(_vptr)) *__vptr = (_vptr);				\
	typeof(*__vptr) __v;						\
	type *__ptr = (void *) (_ptr);					\
	unsigned long __start = (_start), __length = (_length);		\
	type mask, cmask;						\
	unsigned long ts = sizeof(type) * CHAR_BIT; /* type size */	\
	unsigned long start_unit, end_unit, this_unit;			\
	unsigned long end, cshift; /* cshift is "complement shift" */	\
									\
	if (!__length) {						\
		*__vptr = 0;						\
		break;							\
	}								\
									\
	end = __start + __length;					\
	start_unit = __start / ts;					\
	end_unit = (end + (ts - 1)) / ts;				\
									\
	this_unit = start_unit;						\
	if (_bt_is_signed_type(typeof(__v))				\
	    && (__ptr[this_unit] & ((type) 1 << (ts - (__start % ts) - 1)))) \
		__v = ~(typeof(__v)) 0;					\
	else								\
		__v = 0;						\
	if (start_unit == end_unit - 1) {				\
		cmask = __ptr[this_unit];				\
		cmask >>= (ts - (end % ts)) % ts;			\
		if ((end - __start) % ts) {				\
			mask = ~((~(type) 0) << (end - __start));	\
			cmask &= mask;					\
		}							\
		__v = _bt_piecewise_lshift(__v, end - __start);		\
		__v |= _bt_unsigned_cast(typeof(__v), cmask);		\
		*__vptr = __v;						\
		break;							\
	}								\
	if (__start % ts) {						\
		cshift = __start % ts;					\
		mask = ~((~(type) 0) << (ts - cshift));			\
		cmask = __ptr[this_unit];				\
		cmask &= mask;						\
		__v = _bt_piecewise_lshift(__v, ts - cshift);		\
		__v |= _bt_unsigned_cast(typeof(__v), cmask);		\
		__start += ts - cshift;					\
		this_unit++;						\
	}								\
	for (; this_unit < end_unit - 1; this_unit++) {			\
		__v = _bt_piecewise_lshift(__v, ts);			\
		__v |= _bt_unsigned_cast(typeof(__v), __ptr[this_unit]);\
		__start += ts;						\
	}								\
	if (end % ts) {							\
		mask = ~((~(type) 0) << (end % ts));			\
		cmask = __ptr[this_unit];				\
		cmask >>= ts - (end % ts);				\
		cmask &= mask;						\
		__v = _bt_piecewise_lshift(__v, end % ts);		\
		__v |= _bt_unsigned_cast(typeof(__v), cmask);		\
	} else {							\
		__v = _bt_piecewise_lshift(__v, ts);			\
		__v |= _bt_unsigned_cast(typeof(__v), __ptr[this_unit]);\
	}								\
	*__vptr = __v;							\
} while (0)

/*
 * bt_bitfield_read - read integer from a bitfield in native endianness
 * bt_bitfield_read_le - read integer from a bitfield in little endian
 * bt_bitfield_read_be - read integer from a bitfield in big endian
 */

#if (BYTE_ORDER == LITTLE_ENDIAN)

#define bt_bitfield_read(_ptr, type, _start, _length, _vptr)		\
	_bt_bitfield_read_le(_ptr, type, _start, _length, _vptr)

#define bt_bitfield_read_le(_ptr, type, _start, _length, _vptr)		\
	_bt_bitfield_read_le(_ptr, type, _start, _length, _vptr)
	
#define bt_bitfield_read_be(_ptr, type, _start, _length, _vptr)		\
	_bt_bitfield_read_be(_ptr, unsigned char, _start, _length, _vptr)

#elif (BYTE_ORDER == BIG_ENDIAN)

#define bt_bitfield_read(_ptr, type, _start, _length, _vptr)		\
	_bt_bitfield_read_be(_ptr, type, _start, _length, _vptr)

#define bt_bitfield_read_le(_ptr, type, _start, _length, _vptr)		\
	_bt_bitfield_read_le(_ptr, unsigned char, _start, _length, _vptr)
	
#define bt_bitfield_read_be(_ptr, type, _start, _length, _vptr)		\
	_bt_bitfield_read_be(_ptr, type, _start, _length, _vptr)

#else /* (BYTE_ORDER == PDP_ENDIAN) */

#error "Byte order not supported"

#endif

#endif /* _BABELTRACE_BITFIELD_H */
Commit	Line	Data
d79865b9 MD	1	#ifndef _BABELTRACE_BITFIELD_H
d79865b9 MD	2	#define _BABELTRACE_BITFIELD_H
6dc2ca62 MD	3
6dc2ca62 MD	4	/*
d79865b9	5	* BabelTrace
6dc2ca62 MD	6	*
	7	* Bitfields read/write functions.
	8	*
	9	* Copyright 2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
	10	*
	11	* Permission is hereby granted, free of charge, to any person obtaining a copy
	12	* of this software and associated documentation files (the "Software"), to deal
	13	* in the Software without restriction, including without limitation the rights
	14	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	15	* copies of the Software, and to permit persons to whom the Software is
	16	* furnished to do so, subject to the following conditions:
	17	*
	18	* The above copyright notice and this permission notice shall be included in
	19	* all copies or substantial portions of the Software.
c462e188 MD	20	*
	21	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	22	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	23	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
	24	* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	25	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	26	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	27	* SOFTWARE.
6dc2ca62 MD	28	*/
	29
	30	#include <stdint.h> /* C99 5.2.4.2 Numerical limits */
	31	#include <limits.h> /* C99 5.2.4.2 Numerical limits */
6dc2ca62	32	#include <assert.h>
9b0422a0	33	#include <babeltrace/endian.h> /* Non-standard BIG_ENDIAN, LITTLE_ENDIAN, BYTE_ORDER */
6dc2ca62	34
08228826	35	/* We can't shift a int from 32 bit, >> 32 and << 32 on int is undefined */
5f61bf21	36	#define _bt_piecewise_rshift(_v, _shift) \
6dc2ca62	37	({ \
5f61bf21 MD	38	typeof(_v) ___v = (_v); \
	39	typeof(_shift) ___shift = (_shift); \
	40	unsigned long sb = (___shift) / (sizeof(___v) * CHAR_BIT - 1); \
	41	unsigned long final = (___shift) % (sizeof(___v) * CHAR_BIT - 1); \
6dc2ca62 MD	42	\
6dc2ca62 MD	43	for (; sb; sb--) \
5f61bf21 MD	44	___v >>= sizeof(___v) * CHAR_BIT - 1; \
5f61bf21 MD	45	___v >>= final; \
6dc2ca62 MD	46	})
6dc2ca62 MD	47
5f61bf21	48	#define _bt_piecewise_lshift(_v, _shift) \
08228826	49	({ \
5f61bf21 MD	50	typeof(_v) ___v = (_v); \
	51	typeof(_shift) ___shift = (_shift); \
	52	unsigned long sb = (___shift) / (sizeof(___v) * CHAR_BIT - 1); \
	53	unsigned long final = (___shift) % (sizeof(___v) * CHAR_BIT - 1); \
08228826 MD	54	\
08228826 MD	55	for (; sb; sb--) \
5f61bf21 MD	56	___v <<= sizeof(___v) * CHAR_BIT - 1; \
5f61bf21 MD	57	___v <<= final; \
08228826 MD	58	})
08228826 MD	59
d79865b9	60	#define _bt_is_signed_type(type) (((type)(-1)) < 0)
08228826	61
d79865b9	62	#define _bt_unsigned_cast(type, v) \
08228826 MD	63	({ \
	64	(sizeof(v) < sizeof(type)) ? \
	65	((type) (v)) & (~(~(type) 0 << (sizeof(v) * CHAR_BIT))) : \
	66	(type) (v); \
	67	})
	68
6dc2ca62	69	/*
d79865b9	70	* bt_bitfield_write - write integer to a bitfield in native endianness
6dc2ca62 MD	71	*
	72	* Save integer to the bitfield, which starts at the "start" bit, has "len"
	73	* bits.
	74	* The inside of a bitfield is from high bits to low bits.
	75	* Uses native endianness.
	76	* For unsigned "v", pad MSB with 0 if bitfield is larger than v.
	77	* For signed "v", sign-extend v if bitfield is larger than v.
	78	*
	79	* On little endian, bytes are placed from the less significant to the most
	80	* significant. Also, consecutive bitfields are placed from lower bits to higher
	81	* bits.
	82	*
	83	* On big endian, bytes are places from most significant to less significant.
	84	* Also, consecutive bitfields are placed from higher to lower bits.
	85	*/
	86
5f61bf21	87	#define _bt_bitfield_write_le(_ptr, type, _start, _length, _v) \
6dc2ca62	88	do { \
5f61bf21	89	typeof(_v) __v = (_v); \
9128428b	90	type __ptr = (void ) (_ptr); \
5f61bf21	91	unsigned long __start = (_start), __length = (_length); \
47e0f2e2 MD	92	type mask, cmask; \
47e0f2e2 MD	93	unsigned long ts = sizeof(type) * CHAR_BIT; /* type size */ \
6dc2ca62 MD	94	unsigned long start_unit, end_unit, this_unit; \
6dc2ca62 MD	95	unsigned long end, cshift; /* cshift is "complement shift" */ \
6dc2ca62	96	\
5f61bf21	97	if (!__length) \
6dc2ca62 MD	98	break; \
6dc2ca62 MD	99	\
5f61bf21 MD	100	end = __start + __length; \
5f61bf21 MD	101	start_unit = __start / ts; \
6dc2ca62 MD	102	end_unit = (end + (ts - 1)) / ts; \
	103	\
	104	/* Trim v high bits */ \
5f61bf21 MD	105	if (__length < sizeof(__v) * CHAR_BIT) \
5f61bf21 MD	106	__v &= ~((~(typeof(__v)) 0) << __length); \
6dc2ca62 MD	107	\
	108	/* We can now append v with a simple "or", shift it piece-wise */ \
	109	this_unit = start_unit; \
	110	if (start_unit == end_unit - 1) { \
5f61bf21	111	mask = ~((~(type) 0) << (__start % ts)); \
6dc2ca62	112	if (end % ts) \
47e0f2e2	113	mask \|= (~(type) 0) << (end % ts); \
5f61bf21	114	cmask = (type) __v << (__start % ts); \
08228826	115	cmask &= ~mask; \
5f61bf21 MD	116	__ptr[this_unit] &= mask; \
5f61bf21 MD	117	__ptr[this_unit] \|= cmask; \
6dc2ca62 MD	118	break; \
6dc2ca62 MD	119	} \
5f61bf21 MD	120	if (__start % ts) { \
5f61bf21 MD	121	cshift = __start % ts; \
47e0f2e2	122	mask = ~((~(type) 0) << cshift); \
5f61bf21	123	cmask = (type) __v << cshift; \
08228826	124	cmask &= ~mask; \
5f61bf21 MD	125	__ptr[this_unit] &= mask; \
	126	__ptr[this_unit] \|= cmask; \
	127	__v = _bt_piecewise_rshift(__v, ts - cshift); \
	128	__start += ts - cshift; \
6dc2ca62 MD	129	this_unit++; \
	130	} \
	131	for (; this_unit < end_unit - 1; this_unit++) { \
5f61bf21 MD	132	__ptr[this_unit] = (type) __v; \
	133	__v = _bt_piecewise_rshift(__v, ts); \
	134	__start += ts; \
6dc2ca62 MD	135	} \
6dc2ca62 MD	136	if (end % ts) { \
47e0f2e2	137	mask = (~(type) 0) << (end % ts); \
5f61bf21	138	cmask = (type) __v; \
08228826	139	cmask &= ~mask; \
5f61bf21 MD	140	__ptr[this_unit] &= mask; \
5f61bf21 MD	141	__ptr[this_unit] \|= cmask; \
6dc2ca62	142	} else \
5f61bf21	143	__ptr[this_unit] = (type) __v; \
6dc2ca62 MD	144	} while (0)
6dc2ca62 MD	145
5f61bf21	146	#define _bt_bitfield_write_be(_ptr, type, _start, _length, _v) \
6dc2ca62	147	do { \
5f61bf21	148	typeof(_v) __v = (_v); \
9128428b	149	type __ptr = (void ) (_ptr); \
5f61bf21	150	unsigned long __start = (_start), __length = (_length); \
47e0f2e2 MD	151	type mask, cmask; \
47e0f2e2 MD	152	unsigned long ts = sizeof(type) * CHAR_BIT; /* type size */ \
6dc2ca62 MD	153	unsigned long start_unit, end_unit, this_unit; \
6dc2ca62 MD	154	unsigned long end, cshift; /* cshift is "complement shift" */ \
6dc2ca62	155	\
5f61bf21	156	if (!__length) \
6dc2ca62 MD	157	break; \
6dc2ca62 MD	158	\
5f61bf21 MD	159	end = __start + __length; \
5f61bf21 MD	160	start_unit = __start / ts; \
6dc2ca62 MD	161	end_unit = (end + (ts - 1)) / ts; \
	162	\
	163	/* Trim v high bits */ \
5f61bf21 MD	164	if (__length < sizeof(__v) * CHAR_BIT) \
5f61bf21 MD	165	__v &= ~((~(typeof(__v)) 0) << __length); \
6dc2ca62 MD	166	\
	167	/* We can now append v with a simple "or", shift it piece-wise */ \
	168	this_unit = end_unit - 1; \
	169	if (start_unit == end_unit - 1) { \
47e0f2e2	170	mask = ~((~(type) 0) << ((ts - (end % ts)) % ts)); \
5f61bf21 MD	171	if (__start % ts) \
	172	mask \|= (~((type) 0)) << (ts - (__start % ts)); \
	173	cmask = (type) __v << ((ts - (end % ts)) % ts); \
08228826	174	cmask &= ~mask; \
5f61bf21 MD	175	__ptr[this_unit] &= mask; \
5f61bf21 MD	176	__ptr[this_unit] \|= cmask; \
6dc2ca62 MD	177	break; \
	178	} \
	179	if (end % ts) { \
	180	cshift = end % ts; \
47e0f2e2	181	mask = ~((~(type) 0) << (ts - cshift)); \
5f61bf21	182	cmask = (type) __v << (ts - cshift); \
08228826	183	cmask &= ~mask; \
5f61bf21 MD	184	__ptr[this_unit] &= mask; \
	185	__ptr[this_unit] \|= cmask; \
	186	__v = _bt_piecewise_rshift(__v, cshift); \
6dc2ca62 MD	187	end -= cshift; \
	188	this_unit--; \
	189	} \
08228826	190	for (; (long) this_unit >= (long) start_unit + 1; this_unit--) { \
5f61bf21 MD	191	__ptr[this_unit] = (type) __v; \
5f61bf21 MD	192	__v = _bt_piecewise_rshift(__v, ts); \
6dc2ca62 MD	193	end -= ts; \
6dc2ca62 MD	194	} \
5f61bf21 MD	195	if (__start % ts) { \
	196	mask = (~(type) 0) << (ts - (__start % ts)); \
	197	cmask = (type) __v; \
08228826	198	cmask &= ~mask; \
5f61bf21 MD	199	__ptr[this_unit] &= mask; \
5f61bf21 MD	200	__ptr[this_unit] \|= cmask; \
6dc2ca62	201	} else \
5f61bf21	202	__ptr[this_unit] = (type) __v; \
6dc2ca62 MD	203	} while (0)
	204
	205	/*
d79865b9 MD	206	* bt_bitfield_write - write integer to a bitfield in native endianness
	207	* bt_bitfield_write_le - write integer to a bitfield in little endian
	208	* bt_bitfield_write_be - write integer to a bitfield in big endian
6dc2ca62 MD	209	*/
	210
	211	#if (BYTE_ORDER == LITTLE_ENDIAN)
	212
47e0f2e2 MD	213	#define bt_bitfield_write(ptr, type, _start, _length, _v) \
47e0f2e2 MD	214	_bt_bitfield_write_le(ptr, type, _start, _length, _v)
6dc2ca62	215
47e0f2e2 MD	216	#define bt_bitfield_write_le(ptr, type, _start, _length, _v) \
47e0f2e2 MD	217	_bt_bitfield_write_le(ptr, type, _start, _length, _v)
6dc2ca62	218
47e0f2e2 MD	219	#define bt_bitfield_write_be(ptr, type, _start, _length, _v) \
47e0f2e2 MD	220	_bt_bitfield_write_be(ptr, unsigned char, _start, _length, _v)
6dc2ca62 MD	221
	222	#elif (BYTE_ORDER == BIG_ENDIAN)
	223
47e0f2e2 MD	224	#define bt_bitfield_write(ptr, type, _start, _length, _v) \
47e0f2e2 MD	225	_bt_bitfield_write_be(ptr, type, _start, _length, _v)
6dc2ca62	226
47e0f2e2 MD	227	#define bt_bitfield_write_le(ptr, type, _start, _length, _v) \
47e0f2e2 MD	228	_bt_bitfield_write_le(ptr, unsigned char, _start, _length, _v)
6dc2ca62	229
47e0f2e2 MD	230	#define bt_bitfield_write_be(ptr, type, _start, _length, _v) \
47e0f2e2 MD	231	_bt_bitfield_write_be(ptr, type, _start, _length, _v)
6dc2ca62 MD	232
	233	#else /* (BYTE_ORDER == PDP_ENDIAN) */
	234
	235	#error "Byte order not supported"
	236
	237	#endif
	238
5f61bf21	239	#define _bt_bitfield_read_le(_ptr, type, _start, _length, _vptr) \
6dc2ca62	240	do { \
5f61bf21	241	typeof((_vptr)) __vptr = (_vptr); \
5f61bf21	242	typeof(*__vptr) __v; \
9128428b	243	type __ptr = (void ) (_ptr); \
5f61bf21	244	unsigned long __start = (_start), __length = (_length); \
47e0f2e2 MD	245	type mask, cmask; \
47e0f2e2 MD	246	unsigned long ts = sizeof(type) * CHAR_BIT; /* type size */ \
6dc2ca62 MD	247	unsigned long start_unit, end_unit, this_unit; \
6dc2ca62 MD	248	unsigned long end, cshift; /* cshift is "complement shift" */ \
08228826	249	\
5f61bf21 MD	250	if (!__length) { \
5f61bf21 MD	251	*__vptr = 0; \
08228826 MD	252	break; \
	253	} \
	254	\
5f61bf21 MD	255	end = __start + __length; \
5f61bf21 MD	256	start_unit = __start / ts; \
08228826	257	end_unit = (end + (ts - 1)) / ts; \
6a7b3345 MD	258	\
6a7b3345 MD	259	this_unit = end_unit - 1; \
5f61bf21 MD	260	if (_bt_is_signed_type(typeof(__v)) \
	261	&& (__ptr[this_unit] & ((type) 1 << ((end % ts ? : ts) - 1)))) \
	262	__v = ~(typeof(__v)) 0; \
6a7b3345	263	else \
5f61bf21	264	__v = 0; \
6a7b3345	265	if (start_unit == end_unit - 1) { \
5f61bf21 MD	266	cmask = __ptr[this_unit]; \
	267	cmask >>= (__start % ts); \
	268	if ((end - __start) % ts) { \
	269	mask = ~((~(type) 0) << (end - __start)); \
6a7b3345 MD	270	cmask &= mask; \
6a7b3345 MD	271	} \
5f61bf21 MD	272	__v = _bt_piecewise_lshift(__v, end - __start); \
	273	__v \|= _bt_unsigned_cast(typeof(__v), cmask); \
	274	*__vptr = __v; \
6a7b3345 MD	275	break; \
	276	} \
	277	if (end % ts) { \
	278	cshift = end % ts; \
47e0f2e2	279	mask = ~((~(type) 0) << cshift); \
5f61bf21	280	cmask = __ptr[this_unit]; \
6a7b3345	281	cmask &= mask; \
5f61bf21 MD	282	__v = _bt_piecewise_lshift(__v, cshift); \
5f61bf21 MD	283	__v \|= _bt_unsigned_cast(typeof(__v), cmask); \
6a7b3345 MD	284	end -= cshift; \
	285	this_unit--; \
	286	} \
08228826	287	for (; (long) this_unit >= (long) start_unit + 1; this_unit--) { \
5f61bf21 MD	288	__v = _bt_piecewise_lshift(__v, ts); \
5f61bf21 MD	289	__v \|= _bt_unsigned_cast(typeof(__v), __ptr[this_unit]);\
6a7b3345 MD	290	end -= ts; \
6a7b3345 MD	291	} \
5f61bf21 MD	292	if (__start % ts) { \
	293	mask = ~((~(type) 0) << (ts - (__start % ts))); \
	294	cmask = __ptr[this_unit]; \
	295	cmask >>= (__start % ts); \
6a7b3345	296	cmask &= mask; \
5f61bf21 MD	297	__v = _bt_piecewise_lshift(__v, ts - (__start % ts)); \
5f61bf21 MD	298	__v \|= _bt_unsigned_cast(typeof(__v), cmask); \
6a7b3345	299	} else { \
5f61bf21 MD	300	__v = _bt_piecewise_lshift(__v, ts); \
5f61bf21 MD	301	__v \|= _bt_unsigned_cast(typeof(__v), __ptr[this_unit]);\
6a7b3345	302	} \
5f61bf21	303	*__vptr = __v; \
08228826 MD	304	} while (0)
08228826 MD	305
5f61bf21	306	#define _bt_bitfield_read_be(_ptr, type, _start, _length, _vptr) \
08228826	307	do { \
5f61bf21	308	typeof((_vptr)) __vptr = (_vptr); \
5f61bf21	309	typeof(*__vptr) __v; \
9128428b	310	type __ptr = (void ) (_ptr); \
5f61bf21	311	unsigned long __start = (_start), __length = (_length); \
47e0f2e2 MD	312	type mask, cmask; \
47e0f2e2 MD	313	unsigned long ts = sizeof(type) * CHAR_BIT; /* type size */ \
08228826 MD	314	unsigned long start_unit, end_unit, this_unit; \
08228826 MD	315	unsigned long end, cshift; /* cshift is "complement shift" */ \
6dc2ca62	316	\
5f61bf21 MD	317	if (!__length) { \
5f61bf21 MD	318	*__vptr = 0; \
6dc2ca62	319	break; \
08228826	320	} \
6dc2ca62	321	\
5f61bf21 MD	322	end = __start + __length; \
5f61bf21 MD	323	start_unit = __start / ts; \
6dc2ca62	324	end_unit = (end + (ts - 1)) / ts; \
6a7b3345	325	\
08228826	326	this_unit = start_unit; \
5f61bf21 MD	327	if (_bt_is_signed_type(typeof(__v)) \
	328	&& (__ptr[this_unit] & ((type) 1 << (ts - (__start % ts) - 1)))) \
	329	__v = ~(typeof(__v)) 0; \
6a7b3345	330	else \
5f61bf21	331	__v = 0; \
6a7b3345	332	if (start_unit == end_unit - 1) { \
5f61bf21	333	cmask = __ptr[this_unit]; \
6a7b3345	334	cmask >>= (ts - (end % ts)) % ts; \
5f61bf21 MD	335	if ((end - __start) % ts) { \
5f61bf21 MD	336	mask = ~((~(type) 0) << (end - __start)); \
6a7b3345 MD	337	cmask &= mask; \
6a7b3345 MD	338	} \
5f61bf21 MD	339	__v = _bt_piecewise_lshift(__v, end - __start); \
	340	__v \|= _bt_unsigned_cast(typeof(__v), cmask); \
	341	*__vptr = __v; \
6a7b3345 MD	342	break; \
6a7b3345 MD	343	} \
5f61bf21 MD	344	if (__start % ts) { \
5f61bf21 MD	345	cshift = __start % ts; \
47e0f2e2	346	mask = ~((~(type) 0) << (ts - cshift)); \
5f61bf21	347	cmask = __ptr[this_unit]; \
6a7b3345	348	cmask &= mask; \
5f61bf21 MD	349	__v = _bt_piecewise_lshift(__v, ts - cshift); \
	350	__v \|= _bt_unsigned_cast(typeof(__v), cmask); \
	351	__start += ts - cshift; \
6a7b3345 MD	352	this_unit++; \
	353	} \
	354	for (; this_unit < end_unit - 1; this_unit++) { \
5f61bf21 MD	355	__v = _bt_piecewise_lshift(__v, ts); \
	356	__v \|= _bt_unsigned_cast(typeof(__v), __ptr[this_unit]);\
	357	__start += ts; \
6a7b3345 MD	358	} \
6a7b3345 MD	359	if (end % ts) { \
47e0f2e2	360	mask = ~((~(type) 0) << (end % ts)); \
5f61bf21	361	cmask = __ptr[this_unit]; \
6a7b3345 MD	362	cmask >>= ts - (end % ts); \
6a7b3345 MD	363	cmask &= mask; \
5f61bf21 MD	364	__v = _bt_piecewise_lshift(__v, end % ts); \
5f61bf21 MD	365	__v \|= _bt_unsigned_cast(typeof(__v), cmask); \
6a7b3345	366	} else { \
5f61bf21 MD	367	__v = _bt_piecewise_lshift(__v, ts); \
5f61bf21 MD	368	__v \|= _bt_unsigned_cast(typeof(__v), __ptr[this_unit]);\
6a7b3345	369	} \
5f61bf21	370	*__vptr = __v; \
6dc2ca62 MD	371	} while (0)
6dc2ca62 MD	372
6dc2ca62	373	/*
d79865b9 MD	374	* bt_bitfield_read - read integer from a bitfield in native endianness
	375	* bt_bitfield_read_le - read integer from a bitfield in little endian
	376	* bt_bitfield_read_be - read integer from a bitfield in big endian
6dc2ca62 MD	377	*/
6dc2ca62 MD	378
08228826 MD	379	#if (BYTE_ORDER == LITTLE_ENDIAN)
08228826 MD	380
5f61bf21 MD	381	#define bt_bitfield_read(_ptr, type, _start, _length, _vptr) \
5f61bf21 MD	382	_bt_bitfield_read_le(_ptr, type, _start, _length, _vptr)
08228826	383
5f61bf21 MD	384	#define bt_bitfield_read_le(_ptr, type, _start, _length, _vptr) \
5f61bf21 MD	385	_bt_bitfield_read_le(_ptr, type, _start, _length, _vptr)
08228826	386
5f61bf21 MD	387	#define bt_bitfield_read_be(_ptr, type, _start, _length, _vptr) \
5f61bf21 MD	388	_bt_bitfield_read_be(_ptr, unsigned char, _start, _length, _vptr)
08228826 MD	389
	390	#elif (BYTE_ORDER == BIG_ENDIAN)
	391
5f61bf21 MD	392	#define bt_bitfield_read(_ptr, type, _start, _length, _vptr) \
5f61bf21 MD	393	_bt_bitfield_read_be(_ptr, type, _start, _length, _vptr)
08228826	394
5f61bf21 MD	395	#define bt_bitfield_read_le(_ptr, type, _start, _length, _vptr) \
5f61bf21 MD	396	_bt_bitfield_read_le(_ptr, unsigned char, _start, _length, _vptr)
08228826	397
5f61bf21 MD	398	#define bt_bitfield_read_be(_ptr, type, _start, _length, _vptr) \
5f61bf21 MD	399	_bt_bitfield_read_be(_ptr, type, _start, _length, _vptr)
08228826 MD	400
	401	#else /* (BYTE_ORDER == PDP_ENDIAN) */
	402
	403	#error "Byte order not supported"
	404
	405	#endif
6dc2ca62	406
d79865b9	407	#endif /* _BABELTRACE_BITFIELD_H */