| /* Generic streaming support for various data types. |
| |
| Copyright (C) 2011-2020 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 */ |