2018-05-29 Richard Biener <rguenther@suse.de>
[official-gcc.git] / gcc / data-streamer.c
blob03e1d36a6c6dc337316a06d94b202242c0e601ff
1 /* Generic streaming support for basic data types.
3 Copyright (C) 2011-2018 Free Software Foundation, Inc.
4 Contributed by Diego Novillo <dnovillo@google.com>
6 This file is part of GCC.
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.
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.
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/>. */
22 #include "config.h"
23 #include "system.h"
24 #include "coretypes.h"
25 #include "backend.h"
26 #include "tree.h"
27 #include "gimple.h"
28 #include "cgraph.h"
29 #include "data-streamer.h"
31 /* Pack WORK into BP in a variant of uleb format. */
33 void
34 bp_pack_var_len_unsigned (struct bitpack_d *bp, unsigned HOST_WIDE_INT work)
38 unsigned int half_byte = (work & 0x7);
39 work >>= 3;
40 if (work != 0)
41 /* More half_bytes to follow. */
42 half_byte |= 0x8;
44 bp_pack_value (bp, half_byte, 4);
46 while (work != 0);
50 /* Pack WORK into BP in a variant of sleb format. */
52 void
53 bp_pack_var_len_int (struct bitpack_d *bp, HOST_WIDE_INT work)
55 int more, half_byte;
59 half_byte = (work & 0x7);
60 /* arithmetic shift */
61 work >>= 3;
62 more = !((work == 0 && (half_byte & 0x4) == 0)
63 || (work == -1 && (half_byte & 0x4) != 0));
64 if (more)
65 half_byte |= 0x8;
67 bp_pack_value (bp, half_byte, 4);
69 while (more);
73 /* Unpack VAL from BP in a variant of uleb format. */
75 unsigned HOST_WIDE_INT
76 bp_unpack_var_len_unsigned (struct bitpack_d *bp)
78 unsigned HOST_WIDE_INT result = 0;
79 int shift = 0;
80 unsigned HOST_WIDE_INT half_byte;
82 while (true)
84 half_byte = bp_unpack_value (bp, 4);
85 result |= (half_byte & 0x7) << shift;
86 shift += 3;
87 if ((half_byte & 0x8) == 0)
88 return result;
93 /* Unpack VAL from BP in a variant of sleb format. */
95 HOST_WIDE_INT
96 bp_unpack_var_len_int (struct bitpack_d *bp)
98 HOST_WIDE_INT result = 0;
99 int shift = 0;
100 unsigned HOST_WIDE_INT half_byte;
102 while (true)
104 half_byte = bp_unpack_value (bp, 4);
105 result |= (half_byte & 0x7) << shift;
106 shift += 3;
107 if ((half_byte & 0x8) == 0)
109 if ((shift < HOST_BITS_PER_WIDE_INT) && (half_byte & 0x4))
110 result |= - (HOST_WIDE_INT_1U << shift);
112 return result;