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f0efc7aa DN |
1 | /* Generic streaming support for basic data types. |
2 | ||
5624e564 | 3 | Copyright (C) 2011-2015 Free Software Foundation, Inc. |
f0efc7aa DN |
4 | Contributed by Diego Novillo <dnovillo@google.com> |
5 | ||
6 | This file is part of GCC. | |
7 | ||
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. | |
12 | ||
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. | |
17 | ||
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/>. */ | |
21 | ||
22 | #include "config.h" | |
23 | #include "system.h" | |
24 | #include "coretypes.h" | |
c7131fb2 | 25 | #include "backend.h" |
957060b5 | 26 | #include "hard-reg-set.h" |
40e23961 | 27 | #include "tree.h" |
c7131fb2 | 28 | #include "gimple.h" |
c582198b | 29 | #include "cgraph.h" |
f0efc7aa | 30 | #include "data-streamer.h" |
957060b5 AM |
31 | #include "alias.h" |
32 | #include "fold-const.h" | |
33 | #include "internal-fn.h" | |
f0efc7aa DN |
34 | |
35 | /* Pack WORK into BP in a variant of uleb format. */ | |
36 | ||
37 | void | |
38 | bp_pack_var_len_unsigned (struct bitpack_d *bp, unsigned HOST_WIDE_INT work) | |
39 | { | |
40 | do | |
41 | { | |
42 | unsigned int half_byte = (work & 0x7); | |
43 | work >>= 3; | |
44 | if (work != 0) | |
45 | /* More half_bytes to follow. */ | |
46 | half_byte |= 0x8; | |
47 | ||
48 | bp_pack_value (bp, half_byte, 4); | |
49 | } | |
50 | while (work != 0); | |
51 | } | |
52 | ||
53 | ||
54 | /* Pack WORK into BP in a variant of sleb format. */ | |
55 | ||
56 | void | |
57 | bp_pack_var_len_int (struct bitpack_d *bp, HOST_WIDE_INT work) | |
58 | { | |
59 | int more, half_byte; | |
60 | ||
61 | do | |
62 | { | |
63 | half_byte = (work & 0x7); | |
64 | /* arithmetic shift */ | |
65 | work >>= 3; | |
66 | more = !((work == 0 && (half_byte & 0x4) == 0) | |
67 | || (work == -1 && (half_byte & 0x4) != 0)); | |
68 | if (more) | |
69 | half_byte |= 0x8; | |
70 | ||
71 | bp_pack_value (bp, half_byte, 4); | |
72 | } | |
73 | while (more); | |
74 | } | |
75 | ||
76 | ||
77 | /* Unpack VAL from BP in a variant of uleb format. */ | |
78 | ||
79 | unsigned HOST_WIDE_INT | |
80 | bp_unpack_var_len_unsigned (struct bitpack_d *bp) | |
81 | { | |
82 | unsigned HOST_WIDE_INT result = 0; | |
83 | int shift = 0; | |
84 | unsigned HOST_WIDE_INT half_byte; | |
85 | ||
86 | while (true) | |
87 | { | |
88 | half_byte = bp_unpack_value (bp, 4); | |
89 | result |= (half_byte & 0x7) << shift; | |
90 | shift += 3; | |
91 | if ((half_byte & 0x8) == 0) | |
92 | return result; | |
93 | } | |
94 | } | |
95 | ||
96 | ||
97 | /* Unpack VAL from BP in a variant of sleb format. */ | |
98 | ||
99 | HOST_WIDE_INT | |
100 | bp_unpack_var_len_int (struct bitpack_d *bp) | |
101 | { | |
102 | HOST_WIDE_INT result = 0; | |
103 | int shift = 0; | |
104 | unsigned HOST_WIDE_INT half_byte; | |
105 | ||
106 | while (true) | |
107 | { | |
108 | half_byte = bp_unpack_value (bp, 4); | |
109 | result |= (half_byte & 0x7) << shift; | |
110 | shift += 3; | |
111 | if ((half_byte & 0x8) == 0) | |
112 | { | |
113 | if ((shift < HOST_BITS_PER_WIDE_INT) && (half_byte & 0x4)) | |
4176084b | 114 | result |= - (HOST_WIDE_INT_1U << shift); |
f0efc7aa DN |
115 | |
116 | return result; | |
117 | } | |
118 | } | |
119 | } |