[thirdparty/gcc.git] / gcc / data-streamer.h

/* Generic streaming support for various data types.

   Copyright (C) 2011-2019 Free Software Foundation, Inc.
   Contributed by Diego Novillo <dnovillo@google.com>

This file is part of GCC.

GCC 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, or (at your option) any later
version.

GCC 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 GCC; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>.  */

#ifndef GCC_DATA_STREAMER_H
#define GCC_DATA_STREAMER_H

#include "lto-streamer.h"

/* Data structures used to pack values and bitflags into a vector of
   words.  Used to stream values of a fixed number of bits in a space
   efficient way.  */
static unsigned const BITS_PER_BITPACK_WORD = HOST_BITS_PER_WIDE_INT;

typedef unsigned HOST_WIDE_INT bitpack_word_t;

struct bitpack_d
{
  /* The position of the first unused or unconsumed bit in the word.  */
  unsigned pos;

  /* The current word we are (un)packing.  */
  bitpack_word_t word;

  /* The lto_output_stream or the lto_input_block we are streaming to/from.  */
  void *stream;
};

/* In data-streamer.c  */
void bp_pack_var_len_unsigned (struct bitpack_d *, unsigned HOST_WIDE_INT);
void bp_pack_var_len_int (struct bitpack_d *, HOST_WIDE_INT);
unsigned HOST_WIDE_INT bp_unpack_var_len_unsigned (struct bitpack_d *);
HOST_WIDE_INT bp_unpack_var_len_int (struct bitpack_d *);

/* In data-streamer-out.c  */
void streamer_write_zero (struct output_block *);
void streamer_write_uhwi (struct output_block *, unsigned HOST_WIDE_INT);
void streamer_write_hwi (struct output_block *, HOST_WIDE_INT);
void streamer_write_poly_uint64 (struct output_block *, poly_uint64);
void streamer_write_gcov_count (struct output_block *, gcov_type);
void streamer_write_string (struct output_block *, struct lto_output_stream *,
			    const char *, bool);
void streamer_write_string_with_length (struct output_block *,
					struct lto_output_stream *,
					const char *, unsigned int, bool);
void bp_pack_string_with_length (struct output_block *, struct bitpack_d *,
				 const char *, unsigned int, bool);
void bp_pack_string (struct output_block *, struct bitpack_d *,
		     const char *, bool);
void streamer_write_uhwi_stream (struct lto_output_stream *,
				 unsigned HOST_WIDE_INT);
void streamer_write_hwi_stream (struct lto_output_stream *, HOST_WIDE_INT);
void streamer_write_gcov_count_stream (struct lto_output_stream *, gcov_type);
void streamer_write_data_stream (struct lto_output_stream *, const void *,
				 size_t);
void streamer_write_wide_int (struct output_block *, const wide_int &);
void streamer_write_widest_int (struct output_block *, const widest_int &);

/* In data-streamer-in.c  */
const char *streamer_read_string (class data_in *, class lto_input_block *);
const char *streamer_read_indexed_string (class data_in *,
					  class lto_input_block *,
					  unsigned int *);
const char *bp_unpack_indexed_string (class data_in *, struct bitpack_d *,
				      unsigned int *);
const char *bp_unpack_string (class data_in *, struct bitpack_d *);
unsigned HOST_WIDE_INT streamer_read_uhwi (class lto_input_block *);
HOST_WIDE_INT streamer_read_hwi (class lto_input_block *);
poly_uint64 streamer_read_poly_uint64 (class lto_input_block *);
gcov_type streamer_read_gcov_count (class lto_input_block *);
wide_int streamer_read_wide_int (class lto_input_block *);
widest_int streamer_read_widest_int (class lto_input_block *);

/* Returns a new bit-packing context for bit-packing into S.  */
static inline struct bitpack_d
bitpack_create (struct lto_output_stream *s)
{
  struct bitpack_d bp;
  bp.pos = 0;
  bp.word = 0;
  bp.stream = (void *)s;
  return bp;
}

/* Pack the NBITS bit sized value VAL into the bit-packing context BP.  */
static inline void
bp_pack_value (struct bitpack_d *bp, bitpack_word_t val, unsigned nbits)
{
  bitpack_word_t word = bp->word;
  int pos = bp->pos;

  /* Verify that VAL fits in the NBITS.  */
  gcc_checking_assert (nbits == BITS_PER_BITPACK_WORD
		       || !(val & ~(((bitpack_word_t)1<<nbits)-1)));

  /* If val does not fit into the current bitpack word switch to the
     next one.  */
  if (pos + nbits > BITS_PER_BITPACK_WORD)
    {
      streamer_write_uhwi_stream ((struct lto_output_stream *) bp->stream,
				  word);
      word = val;
      pos = nbits;
    }
  else
    {
      word |= val << pos;
      pos += nbits;
    }
  bp->word = word;
  bp->pos = pos;
}

/* Pack VAL into the bit-packing context BP, using NBITS for each
   coefficient.  */
static inline void
bp_pack_poly_value (struct bitpack_d *bp,
		    const poly_int<NUM_POLY_INT_COEFFS, bitpack_word_t> &val,
		    unsigned nbits)
{
  for (int i = 0; i < NUM_POLY_INT_COEFFS; ++i)
    bp_pack_value (bp, val.coeffs[i], nbits);
}

/* Finishes bit-packing of BP.  */
static inline void
streamer_write_bitpack (struct bitpack_d *bp)
{
  streamer_write_uhwi_stream ((struct lto_output_stream *) bp->stream,
			      bp->word);
  bp->word = 0;
  bp->pos = 0;
}

/* Returns a new bit-packing context for bit-unpacking from IB.  */
static inline struct bitpack_d
streamer_read_bitpack (class lto_input_block *ib)
{
  struct bitpack_d bp;
  bp.word = streamer_read_uhwi (ib);
  bp.pos = 0;
  bp.stream = (void *)ib;
  return bp;
}

/* Unpacks NBITS bits from the bit-packing context BP and returns them.  */
static inline bitpack_word_t
bp_unpack_value (struct bitpack_d *bp, unsigned nbits)
{
  bitpack_word_t mask, val;
  int pos = bp->pos;

  mask = (nbits == BITS_PER_BITPACK_WORD
	  ? (bitpack_word_t) -1
	  : ((bitpack_word_t) 1 << nbits) - 1);

  /* If there are not continuous nbits in the current bitpack word
     switch to the next one.  */
  if (pos + nbits > BITS_PER_BITPACK_WORD)
    {
      bp->word = val 
	= streamer_read_uhwi ((class lto_input_block *)bp->stream);
      bp->pos = nbits;
      return val & mask;
    }
  val = bp->word;
  val >>= pos;
  bp->pos = pos + nbits;

  return val & mask;
}

/* Unpacks a polynomial value from the bit-packing context BP in which each
   coefficient has NBITS bits.  */
static inline poly_int<NUM_POLY_INT_COEFFS, bitpack_word_t>
bp_unpack_poly_value (struct bitpack_d *bp, unsigned nbits)
{
  poly_int_pod<NUM_POLY_INT_COEFFS, bitpack_word_t> x;
  for (int i = 0; i < NUM_POLY_INT_COEFFS; ++i)
    x.coeffs[i] = bp_unpack_value (bp, nbits);
  return x;
}


/* Write a character to the output block.  */

static inline void
streamer_write_char_stream (struct lto_output_stream *obs, char c)
{
  /* No space left.  */
  if (obs->left_in_block == 0)
    lto_append_block (obs);

  /* Write the actual character.  */
  char *current_pointer = obs->current_pointer;
  *(current_pointer++) = c;
  obs->current_pointer = current_pointer;
  obs->total_size++;
  obs->left_in_block--;
}


/* Read byte from the input block.  */

static inline unsigned char
streamer_read_uchar (class lto_input_block *ib)
{
  if (ib->p >= ib->len)
    lto_section_overrun (ib);
  return (ib->data[ib->p++]);
}

/* Output VAL into OBS and verify it is in range MIN...MAX that is supposed
   to be compile time constant.
   Be host independent, limit range to 31bits.  */

static inline void
streamer_write_hwi_in_range (struct lto_output_stream *obs,
				  HOST_WIDE_INT min,
				  HOST_WIDE_INT max,
				  HOST_WIDE_INT val)
{
  HOST_WIDE_INT range = max - min;

  gcc_checking_assert (val >= min && val <= max && range > 0
		       && range < 0x7fffffff);

  val -= min;
  streamer_write_uhwi_stream (obs, (unsigned HOST_WIDE_INT) val);
}

/* Input VAL into OBS and verify it is in range MIN...MAX that is supposed
   to be compile time constant.  PURPOSE is used for error reporting.  */

static inline HOST_WIDE_INT
streamer_read_hwi_in_range (class lto_input_block *ib,
				 const char *purpose,
				 HOST_WIDE_INT min,
				 HOST_WIDE_INT max)
{
  HOST_WIDE_INT range = max - min;
  unsigned HOST_WIDE_INT uval = streamer_read_uhwi (ib);

  gcc_checking_assert (range > 0 && range < 0x7fffffff);

  HOST_WIDE_INT val = (HOST_WIDE_INT) (uval + (unsigned HOST_WIDE_INT) min);
  if (val < min || val > max)
    lto_value_range_error (purpose, val, min, max);
  return val;
}

/* Output VAL into BP and verify it is in range MIN...MAX that is supposed
   to be compile time constant.
   Be host independent, limit range to 31bits.  */

static inline void
bp_pack_int_in_range (struct bitpack_d *bp,
		      HOST_WIDE_INT min,
		      HOST_WIDE_INT max,
		      HOST_WIDE_INT val)
{
  HOST_WIDE_INT range = max - min;
  int nbits = floor_log2 (range) + 1;

  gcc_checking_assert (val >= min && val <= max && range > 0
		       && range < 0x7fffffff);

  val -= min;
  bp_pack_value (bp, val, nbits);
}

/* Input VAL into BP and verify it is in range MIN...MAX that is supposed
   to be compile time constant.  PURPOSE is used for error reporting.  */

static inline HOST_WIDE_INT
bp_unpack_int_in_range (struct bitpack_d *bp,
		        const char *purpose,
		        HOST_WIDE_INT min,
		        HOST_WIDE_INT max)
{
  HOST_WIDE_INT range = max - min;
  int nbits = floor_log2 (range) + 1;
  HOST_WIDE_INT val = bp_unpack_value (bp, nbits);

  gcc_checking_assert (range > 0 && range < 0x7fffffff);

  if (val < min || val > max)
    lto_value_range_error (purpose, val, min, max);
  return val;
}

/* Output VAL of type "enum enum_name" into OBS.
   Assume range 0...ENUM_LAST - 1.  */
#define streamer_write_enum(obs,enum_name,enum_last,val) \
  streamer_write_hwi_in_range ((obs), 0, (int)(enum_last) - 1, (int)(val))

/* Input enum of type "enum enum_name" from IB.
   Assume range 0...ENUM_LAST - 1.  */
#define streamer_read_enum(ib,enum_name,enum_last) \
  (enum enum_name)streamer_read_hwi_in_range ((ib), #enum_name, 0, \
					      (int)(enum_last) - 1)

/* Output VAL of type "enum enum_name" into BP.
   Assume range 0...ENUM_LAST - 1.  */
#define bp_pack_enum(bp,enum_name,enum_last,val) \
  bp_pack_int_in_range ((bp), 0, (int)(enum_last) - 1, (int)(val))

/* Input enum of type "enum enum_name" from BP.
   Assume range 0...ENUM_LAST - 1.  */
#define bp_unpack_enum(bp,enum_name,enum_last) \
  (enum enum_name)bp_unpack_int_in_range ((bp), #enum_name, 0, \
					(int)(enum_last) - 1)

/* Output the start of a record with TAG to output block OB.  */

static inline void
streamer_write_record_start (struct output_block *ob, enum LTO_tags tag)
{
  streamer_write_enum (ob->main_stream, LTO_tags, LTO_NUM_TAGS, tag);
}

/* Return the next tag in the input block IB.  */

static inline enum LTO_tags
streamer_read_record_start (class lto_input_block *ib)
{
  return streamer_read_enum (ib, LTO_tags, LTO_NUM_TAGS);
}

#endif  /* GCC_DATA_STREAMER_H  */
Commit	Line	Data
2541503d	1	/* Generic streaming support for various data types.
2541503d	2
fbd26352	3	Copyright (C) 2011-2019 Free Software Foundation, Inc.
2541503d	4	Contributed by Diego Novillo <dnovillo@google.com>
	5
	6	This file is part of GCC.
	7
	8	GCC is free software; you can redistribute it and/or modify it under
	9	the terms of the GNU General Public License as published by the Free
	10	Software Foundation; either version 3, or (at your option) any later
	11	version.
	12
	13	GCC is distributed in the hope that it will be useful, but WITHOUT ANY
	14	WARRANTY; without even the implied warranty of MERCHANTABILITY or
	15	FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	16	for more details.
	17
	18	You should have received a copy of the GNU General Public License
	19	along with GCC; see the file COPYING3. If not see
	20	<http://www.gnu.org/licenses/>. */
	21
	22	#ifndef GCC_DATA_STREAMER_H
	23	#define GCC_DATA_STREAMER_H
	24
2541503d	25	#include "lto-streamer.h"
	26
	27	/* Data structures used to pack values and bitflags into a vector of
	28	words. Used to stream values of a fixed number of bits in a space
	29	efficient way. */
	30	static unsigned const BITS_PER_BITPACK_WORD = HOST_BITS_PER_WIDE_INT;
	31
	32	typedef unsigned HOST_WIDE_INT bitpack_word_t;
2541503d	33
	34	struct bitpack_d
	35	{
	36	/* The position of the first unused or unconsumed bit in the word. */
	37	unsigned pos;
	38
	39	/* The current word we are (un)packing. */
	40	bitpack_word_t word;
	41
	42	/* The lto_output_stream or the lto_input_block we are streaming to/from. */
	43	void *stream;
	44	};
	45
7f385784	46	/* In data-streamer.c */
	47	void bp_pack_var_len_unsigned (struct bitpack_d *, unsigned HOST_WIDE_INT);
	48	void bp_pack_var_len_int (struct bitpack_d *, HOST_WIDE_INT);
	49	unsigned HOST_WIDE_INT bp_unpack_var_len_unsigned (struct bitpack_d *);
	50	HOST_WIDE_INT bp_unpack_var_len_int (struct bitpack_d *);
	51
	52	/* In data-streamer-out.c */
	53	void streamer_write_zero (struct output_block *);
	54	void streamer_write_uhwi (struct output_block *, unsigned HOST_WIDE_INT);
	55	void streamer_write_hwi (struct output_block *, HOST_WIDE_INT);
c47e61e1	56	void streamer_write_poly_uint64 (struct output_block *, poly_uint64);
fc44a215	57	void streamer_write_gcov_count (struct output_block *, gcov_type);
7f385784	58	void streamer_write_string (struct output_block , struct lto_output_stream ,
7f385784	59	const char *, bool);
7f385784	60	void streamer_write_string_with_length (struct output_block *,
	61	struct lto_output_stream *,
	62	const char *, unsigned int, bool);
07de37ab	63	void bp_pack_string_with_length (struct output_block , struct bitpack_d ,
	64	const char *, unsigned int, bool);
	65	void bp_pack_string (struct output_block , struct bitpack_d ,
	66	const char *, bool);
7f385784	67	void streamer_write_uhwi_stream (struct lto_output_stream *,
	68	unsigned HOST_WIDE_INT);
	69	void streamer_write_hwi_stream (struct lto_output_stream *, HOST_WIDE_INT);
fc44a215	70	void streamer_write_gcov_count_stream (struct lto_output_stream *, gcov_type);
a797f9ee	71	void streamer_write_data_stream (struct lto_output_stream , const void ,
a797f9ee	72	size_t);
8cf48217	73	void streamer_write_wide_int (struct output_block *, const wide_int &);
8cf48217	74	void streamer_write_widest_int (struct output_block *, const widest_int &);
7f385784	75
7f385784	76	/* In data-streamer-in.c */
2e966e2a	77	const char streamer_read_string (class data_in , class lto_input_block *);
	78	const char streamer_read_indexed_string (class data_in ,
	79	class lto_input_block *,
7f385784	80	unsigned int *);
2e966e2a	81	const char bp_unpack_indexed_string (class data_in , struct bitpack_d *,
07de37ab	82	unsigned int *);
2e966e2a	83	const char bp_unpack_string (class data_in , struct bitpack_d *);
	84	unsigned HOST_WIDE_INT streamer_read_uhwi (class lto_input_block *);
	85	HOST_WIDE_INT streamer_read_hwi (class lto_input_block *);
c47e61e1	86	poly_uint64 streamer_read_poly_uint64 (class lto_input_block *);
2e966e2a	87	gcov_type streamer_read_gcov_count (class lto_input_block *);
	88	wide_int streamer_read_wide_int (class lto_input_block *);
	89	widest_int streamer_read_widest_int (class lto_input_block *);
2541503d	90
2541503d	91	/* Returns a new bit-packing context for bit-packing into S. */
	92	static inline struct bitpack_d
	93	bitpack_create (struct lto_output_stream *s)
	94	{
	95	struct bitpack_d bp;
	96	bp.pos = 0;
	97	bp.word = 0;
	98	bp.stream = (void *)s;
	99	return bp;
	100	}
	101
	102	/* Pack the NBITS bit sized value VAL into the bit-packing context BP. */
	103	static inline void
	104	bp_pack_value (struct bitpack_d *bp, bitpack_word_t val, unsigned nbits)
	105	{
	106	bitpack_word_t word = bp->word;
	107	int pos = bp->pos;
	108
	109	/* Verify that VAL fits in the NBITS. */
	110	gcc_checking_assert (nbits == BITS_PER_BITPACK_WORD
	111	\|\| !(val & ~(((bitpack_word_t)1<<nbits)-1)));
	112
	113	/* If val does not fit into the current bitpack word switch to the
	114	next one. */
	115	if (pos + nbits > BITS_PER_BITPACK_WORD)
	116	{
7f385784	117	streamer_write_uhwi_stream ((struct lto_output_stream *) bp->stream,
7f385784	118	word);
2541503d	119	word = val;
	120	pos = nbits;
	121	}
	122	else
	123	{
	124	word \|= val << pos;
	125	pos += nbits;
	126	}
	127	bp->word = word;
	128	bp->pos = pos;
	129	}
	130
ba7efd65	131	/* Pack VAL into the bit-packing context BP, using NBITS for each
	132	coefficient. */
	133	static inline void
	134	bp_pack_poly_value (struct bitpack_d *bp,
	135	const poly_int<NUM_POLY_INT_COEFFS, bitpack_word_t> &val,
	136	unsigned nbits)
	137	{
	138	for (int i = 0; i < NUM_POLY_INT_COEFFS; ++i)
	139	bp_pack_value (bp, val.coeffs[i], nbits);
	140	}
	141
2541503d	142	/* Finishes bit-packing of BP. */
2541503d	143	static inline void
7f385784	144	streamer_write_bitpack (struct bitpack_d *bp)
2541503d	145	{
7f385784	146	streamer_write_uhwi_stream ((struct lto_output_stream *) bp->stream,
7f385784	147	bp->word);
2541503d	148	bp->word = 0;
	149	bp->pos = 0;
	150	}
	151
	152	/* Returns a new bit-packing context for bit-unpacking from IB. */
	153	static inline struct bitpack_d
2e966e2a	154	streamer_read_bitpack (class lto_input_block *ib)
2541503d	155	{
2541503d	156	struct bitpack_d bp;
7f385784	157	bp.word = streamer_read_uhwi (ib);
2541503d	158	bp.pos = 0;
	159	bp.stream = (void *)ib;
	160	return bp;
	161	}
	162
	163	/* Unpacks NBITS bits from the bit-packing context BP and returns them. */
	164	static inline bitpack_word_t
	165	bp_unpack_value (struct bitpack_d *bp, unsigned nbits)
	166	{
	167	bitpack_word_t mask, val;
	168	int pos = bp->pos;
	169
	170	mask = (nbits == BITS_PER_BITPACK_WORD
	171	? (bitpack_word_t) -1
	172	: ((bitpack_word_t) 1 << nbits) - 1);
	173
	174	/* If there are not continuous nbits in the current bitpack word
	175	switch to the next one. */
	176	if (pos + nbits > BITS_PER_BITPACK_WORD)
	177	{
7f385784	178	bp->word = val
2e966e2a	179	= streamer_read_uhwi ((class lto_input_block *)bp->stream);
2541503d	180	bp->pos = nbits;
	181	return val & mask;
	182	}
	183	val = bp->word;
	184	val >>= pos;
	185	bp->pos = pos + nbits;
	186
	187	return val & mask;
	188	}
	189
ba7efd65	190	/* Unpacks a polynomial value from the bit-packing context BP in which each
	191	coefficient has NBITS bits. */
	192	static inline poly_int<NUM_POLY_INT_COEFFS, bitpack_word_t>
	193	bp_unpack_poly_value (struct bitpack_d *bp, unsigned nbits)
	194	{
	195	poly_int_pod<NUM_POLY_INT_COEFFS, bitpack_word_t> x;
	196	for (int i = 0; i < NUM_POLY_INT_COEFFS; ++i)
	197	x.coeffs[i] = bp_unpack_value (bp, nbits);
	198	return x;
	199	}
	200
2541503d	201
	202	/* Write a character to the output block. */
	203
	204	static inline void
7f385784	205	streamer_write_char_stream (struct lto_output_stream *obs, char c)
2541503d	206	{
	207	/* No space left. */
	208	if (obs->left_in_block == 0)
	209	lto_append_block (obs);
	210
	211	/* Write the actual character. */
2f5bed2a	212	char *current_pointer = obs->current_pointer;
	213	*(current_pointer++) = c;
	214	obs->current_pointer = current_pointer;
2541503d	215	obs->total_size++;
	216	obs->left_in_block--;
	217	}
	218
	219
	220	/* Read byte from the input block. */
	221
	222	static inline unsigned char
2e966e2a	223	streamer_read_uchar (class lto_input_block *ib)
2541503d	224	{
	225	if (ib->p >= ib->len)
	226	lto_section_overrun (ib);
	227	return (ib->data[ib->p++]);
	228	}
	229
	230	/* Output VAL into OBS and verify it is in range MIN...MAX that is supposed
	231	to be compile time constant.
	232	Be host independent, limit range to 31bits. */
	233
	234	static inline void
7f385784	235	streamer_write_hwi_in_range (struct lto_output_stream *obs,
	236	HOST_WIDE_INT min,
	237	HOST_WIDE_INT max,
	238	HOST_WIDE_INT val)
2541503d	239	{
	240	HOST_WIDE_INT range = max - min;
	241
	242	gcc_checking_assert (val >= min && val <= max && range > 0
	243	&& range < 0x7fffffff);
	244
	245	val -= min;
e09e0df2	246	streamer_write_uhwi_stream (obs, (unsigned HOST_WIDE_INT) val);
2541503d	247	}
	248
	249	/* Input VAL into OBS and verify it is in range MIN...MAX that is supposed
	250	to be compile time constant. PURPOSE is used for error reporting. */
	251
	252	static inline HOST_WIDE_INT
2e966e2a	253	streamer_read_hwi_in_range (class lto_input_block *ib,
7f385784	254	const char *purpose,
	255	HOST_WIDE_INT min,
	256	HOST_WIDE_INT max)
2541503d	257	{
2541503d	258	HOST_WIDE_INT range = max - min;
e09e0df2	259	unsigned HOST_WIDE_INT uval = streamer_read_uhwi (ib);
2541503d	260
	261	gcc_checking_assert (range > 0 && range < 0x7fffffff);
	262
e09e0df2	263	HOST_WIDE_INT val = (HOST_WIDE_INT) (uval + (unsigned HOST_WIDE_INT) min);
2541503d	264	if (val < min \|\| val > max)
	265	lto_value_range_error (purpose, val, min, max);
	266	return val;
	267	}
	268
	269	/* Output VAL into BP and verify it is in range MIN...MAX that is supposed
	270	to be compile time constant.
	271	Be host independent, limit range to 31bits. */
	272
	273	static inline void
	274	bp_pack_int_in_range (struct bitpack_d *bp,
	275	HOST_WIDE_INT min,
	276	HOST_WIDE_INT max,
	277	HOST_WIDE_INT val)
	278	{
	279	HOST_WIDE_INT range = max - min;
	280	int nbits = floor_log2 (range) + 1;
	281
	282	gcc_checking_assert (val >= min && val <= max && range > 0
	283	&& range < 0x7fffffff);
	284
	285	val -= min;
	286	bp_pack_value (bp, val, nbits);
	287	}
	288
	289	/* Input VAL into BP and verify it is in range MIN...MAX that is supposed
	290	to be compile time constant. PURPOSE is used for error reporting. */
	291
	292	static inline HOST_WIDE_INT
	293	bp_unpack_int_in_range (struct bitpack_d *bp,
	294	const char *purpose,
	295	HOST_WIDE_INT min,
	296	HOST_WIDE_INT max)
	297	{
	298	HOST_WIDE_INT range = max - min;
	299	int nbits = floor_log2 (range) + 1;
	300	HOST_WIDE_INT val = bp_unpack_value (bp, nbits);
	301
	302	gcc_checking_assert (range > 0 && range < 0x7fffffff);
	303
	304	if (val < min \|\| val > max)
	305	lto_value_range_error (purpose, val, min, max);
	306	return val;
	307	}
	308
	309	/* Output VAL of type "enum enum_name" into OBS.
	310	Assume range 0...ENUM_LAST - 1. */
7f385784	311	#define streamer_write_enum(obs,enum_name,enum_last,val) \
7f385784	312	streamer_write_hwi_in_range ((obs), 0, (int)(enum_last) - 1, (int)(val))
2541503d	313
	314	/* Input enum of type "enum enum_name" from IB.
	315	Assume range 0...ENUM_LAST - 1. */
7f385784	316	#define streamer_read_enum(ib,enum_name,enum_last) \
	317	(enum enum_name)streamer_read_hwi_in_range ((ib), #enum_name, 0, \
	318	(int)(enum_last) - 1)
2541503d	319
	320	/* Output VAL of type "enum enum_name" into BP.
	321	Assume range 0...ENUM_LAST - 1. */
	322	#define bp_pack_enum(bp,enum_name,enum_last,val) \
	323	bp_pack_int_in_range ((bp), 0, (int)(enum_last) - 1, (int)(val))
	324
	325	/* Input enum of type "enum enum_name" from BP.
	326	Assume range 0...ENUM_LAST - 1. */
	327	#define bp_unpack_enum(bp,enum_name,enum_last) \
	328	(enum enum_name)bp_unpack_int_in_range ((bp), #enum_name, 0, \
	329	(int)(enum_last) - 1)
	330
	331	/* Output the start of a record with TAG to output block OB. */
	332
	333	static inline void
7f385784	334	streamer_write_record_start (struct output_block *ob, enum LTO_tags tag)
2541503d	335	{
7f385784	336	streamer_write_enum (ob->main_stream, LTO_tags, LTO_NUM_TAGS, tag);
2541503d	337	}
	338
	339	/* Return the next tag in the input block IB. */
	340
	341	static inline enum LTO_tags
2e966e2a	342	streamer_read_record_start (class lto_input_block *ib)
2541503d	343	{
7f385784	344	return streamer_read_enum (ib, LTO_tags, LTO_NUM_TAGS);
2541503d	345	}
2541503d	346
2541503d	347	#endif /* GCC_DATA_STREAMER_H */