1/* Generic streaming support for basic data types.
2
3 Copyright (C) 2011-2017 Free Software Foundation, Inc.
4 Contributed by Diego Novillo <dnovillo@google.com>
5
6This file is part of GCC.
7
8GCC is free software; you can redistribute it and/or modify it under
9the terms of the GNU General Public License as published by the Free
10Software Foundation; either version 3, or (at your option) any later
11version.
12
13GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14WARRANTY; without even the implied warranty of MERCHANTABILITY or
15FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16for more details.
17
18You should have received a copy of the GNU General Public License
19along with GCC; see the file COPYING3. If not see
20<http://www.gnu.org/licenses/>. */
21
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"
30
31/* Pack WORK into BP in a variant of uleb format. */
32
33void
34bp_pack_var_len_unsigned (struct bitpack_d *bp, unsigned HOST_WIDE_INT work)
35{
36 do
37 {
38 unsigned int half_byte = (work & 0x7);
39 work >>= 3;
40 if (work != 0)
41 /* More half_bytes to follow. */
42 half_byte |= 0x8;
43
44 bp_pack_value (bp, half_byte, 4);
45 }
46 while (work != 0);
47}
48
49
50/* Pack WORK into BP in a variant of sleb format. */
51
52void
53bp_pack_var_len_int (struct bitpack_d *bp, HOST_WIDE_INT work)
54{
55 int more, half_byte;
56
57 do
58 {
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;
66
67 bp_pack_value (bp, half_byte, 4);
68 }
69 while (more);
70}
71
72
73/* Unpack VAL from BP in a variant of uleb format. */
74
75unsigned HOST_WIDE_INT
76bp_unpack_var_len_unsigned (struct bitpack_d *bp)
77{
78 unsigned HOST_WIDE_INT result = 0;
79 int shift = 0;
80 unsigned HOST_WIDE_INT half_byte;
81
82 while (true)
83 {
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;
89 }
90}
91
92
93/* Unpack VAL from BP in a variant of sleb format. */
94
95HOST_WIDE_INT
96bp_unpack_var_len_int (struct bitpack_d *bp)
97{
98 HOST_WIDE_INT result = 0;
99 int shift = 0;
100 unsigned HOST_WIDE_INT half_byte;
101
102 while (true)
103 {
104 half_byte = bp_unpack_value (bp, 4);
105 result |= (half_byte & 0x7) << shift;
106 shift += 3;
107 if ((half_byte & 0x8) == 0)
108 {
109 if ((shift < HOST_BITS_PER_WIDE_INT) && (half_byte & 0x4))
110 result |= - (HOST_WIDE_INT_1U << shift);
111
112 return result;
113 }
114 }
115}
116