1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
|
/* Generic streaming support for basic data types.
Copyright 2011 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 "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)1 << shift);
return result;
}
}
}
|
