| /* Generic streaming support for basic data types. |
| |
| Copyright (C) 2011-2017 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/>. */ |
| |
| #include "config.h" |
| #include "system.h" |
| #include "coretypes.h" |
| #include "backend.h" |
| #include "tree.h" |
| #include "gimple.h" |
| #include "cgraph.h" |
| #include "data-streamer.h" |
| |
| /* Pack WORK into BP in a variant of uleb format. */ |
| |
| void |
| bp_pack_var_len_unsigned (struct bitpack_d *bp, unsigned HOST_WIDE_INT work) |
| { |
| do |
| { |
| unsigned int half_byte = (work & 0x7); |
| work >>= 3; |
| if (work != 0) |
| /* More half_bytes to follow. */ |
| half_byte |= 0x8; |
| |
| bp_pack_value (bp, half_byte, 4); |
| } |
| while (work != 0); |
| } |
| |
| |
| /* Pack WORK into BP in a variant of sleb format. */ |
| |
| void |
| bp_pack_var_len_int (struct bitpack_d *bp, HOST_WIDE_INT work) |
| { |
| int more, half_byte; |
| |
| do |
| { |
| half_byte = (work & 0x7); |
| /* arithmetic shift */ |
| work >>= 3; |
| more = !((work == 0 && (half_byte & 0x4) == 0) |
| || (work == -1 && (half_byte & 0x4) != 0)); |
| if (more) |
| half_byte |= 0x8; |
| |
| bp_pack_value (bp, half_byte, 4); |
| } |
| while (more); |
| } |
| |
| |
| /* Unpack VAL from BP in a variant of uleb format. */ |
| |
| unsigned HOST_WIDE_INT |
| bp_unpack_var_len_unsigned (struct bitpack_d *bp) |
| { |
| unsigned HOST_WIDE_INT result = 0; |
| int shift = 0; |
| unsigned HOST_WIDE_INT half_byte; |
| |
| while (true) |
| { |
| half_byte = bp_unpack_value (bp, 4); |
| result |= (half_byte & 0x7) << shift; |
| shift += 3; |
| if ((half_byte & 0x8) == 0) |
| return result; |
| } |
| } |
| |
| |
| /* Unpack VAL from BP in a variant of sleb format. */ |
| |
| HOST_WIDE_INT |
| bp_unpack_var_len_int (struct bitpack_d *bp) |
| { |
| HOST_WIDE_INT result = 0; |
| int shift = 0; |
| unsigned HOST_WIDE_INT half_byte; |
| |
| while (true) |
| { |
| half_byte = bp_unpack_value (bp, 4); |
| result |= (half_byte & 0x7) << shift; |
| shift += 3; |
| if ((half_byte & 0x8) == 0) |
| { |
| if ((shift < HOST_BITS_PER_WIDE_INT) && (half_byte & 0x4)) |
| result |= - (HOST_WIDE_INT_1U << shift); |
| |
| return result; |
| } |
| } |
| } |