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321 lines
9.6 KiB
C
321 lines
9.6 KiB
C
/* Generic streaming support for various data types.
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Copyright (C) 2011-2015 Free Software Foundation, Inc.
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Contributed by Diego Novillo <dnovillo@google.com>
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#ifndef GCC_DATA_STREAMER_H
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#define GCC_DATA_STREAMER_H
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#include "vec.h"
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#include "lto-streamer.h"
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/* Data structures used to pack values and bitflags into a vector of
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words. Used to stream values of a fixed number of bits in a space
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efficient way. */
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static unsigned const BITS_PER_BITPACK_WORD = HOST_BITS_PER_WIDE_INT;
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typedef unsigned HOST_WIDE_INT bitpack_word_t;
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struct bitpack_d
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{
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/* The position of the first unused or unconsumed bit in the word. */
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unsigned pos;
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/* The current word we are (un)packing. */
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bitpack_word_t word;
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/* The lto_output_stream or the lto_input_block we are streaming to/from. */
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void *stream;
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};
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/* In data-streamer.c */
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void bp_pack_var_len_unsigned (struct bitpack_d *, unsigned HOST_WIDE_INT);
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void bp_pack_var_len_int (struct bitpack_d *, HOST_WIDE_INT);
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unsigned HOST_WIDE_INT bp_unpack_var_len_unsigned (struct bitpack_d *);
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HOST_WIDE_INT bp_unpack_var_len_int (struct bitpack_d *);
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/* In data-streamer-out.c */
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void streamer_write_zero (struct output_block *);
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void streamer_write_uhwi (struct output_block *, unsigned HOST_WIDE_INT);
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void streamer_write_hwi (struct output_block *, HOST_WIDE_INT);
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void streamer_write_gcov_count (struct output_block *, gcov_type);
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void streamer_write_string (struct output_block *, struct lto_output_stream *,
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const char *, bool);
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void streamer_write_string_with_length (struct output_block *,
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struct lto_output_stream *,
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const char *, unsigned int, bool);
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void bp_pack_string_with_length (struct output_block *, struct bitpack_d *,
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const char *, unsigned int, bool);
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void bp_pack_string (struct output_block *, struct bitpack_d *,
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const char *, bool);
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void streamer_write_uhwi_stream (struct lto_output_stream *,
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unsigned HOST_WIDE_INT);
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void streamer_write_hwi_stream (struct lto_output_stream *, HOST_WIDE_INT);
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void streamer_write_gcov_count_stream (struct lto_output_stream *, gcov_type);
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void streamer_write_data_stream (struct lto_output_stream *, const void *,
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size_t);
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/* In data-streamer-in.c */
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const char *streamer_read_string (struct data_in *, struct lto_input_block *);
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const char *streamer_read_indexed_string (struct data_in *,
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struct lto_input_block *,
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unsigned int *);
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const char *bp_unpack_indexed_string (struct data_in *, struct bitpack_d *,
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unsigned int *);
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const char *bp_unpack_string (struct data_in *, struct bitpack_d *);
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unsigned HOST_WIDE_INT streamer_read_uhwi (struct lto_input_block *);
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HOST_WIDE_INT streamer_read_hwi (struct lto_input_block *);
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gcov_type streamer_read_gcov_count (struct lto_input_block *);
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/* Returns a new bit-packing context for bit-packing into S. */
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static inline struct bitpack_d
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bitpack_create (struct lto_output_stream *s)
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{
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struct bitpack_d bp;
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bp.pos = 0;
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bp.word = 0;
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bp.stream = (void *)s;
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return bp;
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}
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/* Pack the NBITS bit sized value VAL into the bit-packing context BP. */
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static inline void
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bp_pack_value (struct bitpack_d *bp, bitpack_word_t val, unsigned nbits)
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{
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bitpack_word_t word = bp->word;
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int pos = bp->pos;
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/* Verify that VAL fits in the NBITS. */
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gcc_checking_assert (nbits == BITS_PER_BITPACK_WORD
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|| !(val & ~(((bitpack_word_t)1<<nbits)-1)));
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/* If val does not fit into the current bitpack word switch to the
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next one. */
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if (pos + nbits > BITS_PER_BITPACK_WORD)
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{
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streamer_write_uhwi_stream ((struct lto_output_stream *) bp->stream,
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word);
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word = val;
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pos = nbits;
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}
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else
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{
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word |= val << pos;
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pos += nbits;
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}
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bp->word = word;
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bp->pos = pos;
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}
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/* Finishes bit-packing of BP. */
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static inline void
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streamer_write_bitpack (struct bitpack_d *bp)
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{
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streamer_write_uhwi_stream ((struct lto_output_stream *) bp->stream,
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bp->word);
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bp->word = 0;
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bp->pos = 0;
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}
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/* Returns a new bit-packing context for bit-unpacking from IB. */
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static inline struct bitpack_d
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streamer_read_bitpack (struct lto_input_block *ib)
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{
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struct bitpack_d bp;
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bp.word = streamer_read_uhwi (ib);
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bp.pos = 0;
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bp.stream = (void *)ib;
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return bp;
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}
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/* Unpacks NBITS bits from the bit-packing context BP and returns them. */
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static inline bitpack_word_t
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bp_unpack_value (struct bitpack_d *bp, unsigned nbits)
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{
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bitpack_word_t mask, val;
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int pos = bp->pos;
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mask = (nbits == BITS_PER_BITPACK_WORD
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? (bitpack_word_t) -1
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: ((bitpack_word_t) 1 << nbits) - 1);
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/* If there are not continuous nbits in the current bitpack word
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switch to the next one. */
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if (pos + nbits > BITS_PER_BITPACK_WORD)
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{
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bp->word = val
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= streamer_read_uhwi ((struct lto_input_block *)bp->stream);
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bp->pos = nbits;
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return val & mask;
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}
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val = bp->word;
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val >>= pos;
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bp->pos = pos + nbits;
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return val & mask;
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}
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/* Write a character to the output block. */
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static inline void
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streamer_write_char_stream (struct lto_output_stream *obs, char c)
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{
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/* No space left. */
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if (obs->left_in_block == 0)
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lto_append_block (obs);
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/* Write the actual character. */
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char *current_pointer = obs->current_pointer;
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*(current_pointer++) = c;
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obs->current_pointer = current_pointer;
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obs->total_size++;
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obs->left_in_block--;
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}
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/* Read byte from the input block. */
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static inline unsigned char
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streamer_read_uchar (struct lto_input_block *ib)
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{
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if (ib->p >= ib->len)
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lto_section_overrun (ib);
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return (ib->data[ib->p++]);
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}
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/* Output VAL into OBS and verify it is in range MIN...MAX that is supposed
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to be compile time constant.
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Be host independent, limit range to 31bits. */
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static inline void
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streamer_write_hwi_in_range (struct lto_output_stream *obs,
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HOST_WIDE_INT min,
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HOST_WIDE_INT max,
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HOST_WIDE_INT val)
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{
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HOST_WIDE_INT range = max - min;
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gcc_checking_assert (val >= min && val <= max && range > 0
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&& range < 0x7fffffff);
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val -= min;
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streamer_write_uhwi_stream (obs, (unsigned HOST_WIDE_INT) val);
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}
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/* Input VAL into OBS and verify it is in range MIN...MAX that is supposed
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to be compile time constant. PURPOSE is used for error reporting. */
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static inline HOST_WIDE_INT
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streamer_read_hwi_in_range (struct lto_input_block *ib,
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const char *purpose,
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HOST_WIDE_INT min,
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HOST_WIDE_INT max)
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{
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HOST_WIDE_INT range = max - min;
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unsigned HOST_WIDE_INT uval = streamer_read_uhwi (ib);
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gcc_checking_assert (range > 0 && range < 0x7fffffff);
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HOST_WIDE_INT val = (HOST_WIDE_INT) (uval + (unsigned HOST_WIDE_INT) min);
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if (val < min || val > max)
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lto_value_range_error (purpose, val, min, max);
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return val;
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}
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/* Output VAL into BP and verify it is in range MIN...MAX that is supposed
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to be compile time constant.
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Be host independent, limit range to 31bits. */
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static inline void
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bp_pack_int_in_range (struct bitpack_d *bp,
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HOST_WIDE_INT min,
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HOST_WIDE_INT max,
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HOST_WIDE_INT val)
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{
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HOST_WIDE_INT range = max - min;
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int nbits = floor_log2 (range) + 1;
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gcc_checking_assert (val >= min && val <= max && range > 0
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&& range < 0x7fffffff);
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val -= min;
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bp_pack_value (bp, val, nbits);
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}
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/* Input VAL into BP and verify it is in range MIN...MAX that is supposed
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to be compile time constant. PURPOSE is used for error reporting. */
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static inline HOST_WIDE_INT
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bp_unpack_int_in_range (struct bitpack_d *bp,
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const char *purpose,
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HOST_WIDE_INT min,
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HOST_WIDE_INT max)
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{
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HOST_WIDE_INT range = max - min;
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int nbits = floor_log2 (range) + 1;
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HOST_WIDE_INT val = bp_unpack_value (bp, nbits);
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gcc_checking_assert (range > 0 && range < 0x7fffffff);
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if (val < min || val > max)
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lto_value_range_error (purpose, val, min, max);
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return val;
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}
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/* Output VAL of type "enum enum_name" into OBS.
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Assume range 0...ENUM_LAST - 1. */
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#define streamer_write_enum(obs,enum_name,enum_last,val) \
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streamer_write_hwi_in_range ((obs), 0, (int)(enum_last) - 1, (int)(val))
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/* Input enum of type "enum enum_name" from IB.
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Assume range 0...ENUM_LAST - 1. */
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#define streamer_read_enum(ib,enum_name,enum_last) \
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(enum enum_name)streamer_read_hwi_in_range ((ib), #enum_name, 0, \
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(int)(enum_last) - 1)
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/* Output VAL of type "enum enum_name" into BP.
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Assume range 0...ENUM_LAST - 1. */
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#define bp_pack_enum(bp,enum_name,enum_last,val) \
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bp_pack_int_in_range ((bp), 0, (int)(enum_last) - 1, (int)(val))
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/* Input enum of type "enum enum_name" from BP.
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Assume range 0...ENUM_LAST - 1. */
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#define bp_unpack_enum(bp,enum_name,enum_last) \
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(enum enum_name)bp_unpack_int_in_range ((bp), #enum_name, 0, \
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(int)(enum_last) - 1)
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/* Output the start of a record with TAG to output block OB. */
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static inline void
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streamer_write_record_start (struct output_block *ob, enum LTO_tags tag)
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{
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streamer_write_enum (ob->main_stream, LTO_tags, LTO_NUM_TAGS, tag);
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}
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/* Return the next tag in the input block IB. */
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static inline enum LTO_tags
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streamer_read_record_start (struct lto_input_block *ib)
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{
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return streamer_read_enum (ib, LTO_tags, LTO_NUM_TAGS);
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}
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#endif /* GCC_DATA_STREAMER_H */
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