1 | /* Generic streaming support for basic data types. |
2 | |
3 | Copyright (C) 2011-2023 Free Software Foundation, Inc. |
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" |
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 | |
33 | void |
34 | bp_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, val: half_byte, nbits: 4); |
45 | } |
46 | while (work != 0); |
47 | } |
48 | |
49 | |
50 | /* Pack WORK into BP in a variant of sleb format. */ |
51 | |
52 | void |
53 | bp_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, val: half_byte, nbits: 4); |
68 | } |
69 | while (more); |
70 | } |
71 | |
72 | |
73 | /* Unpack VAL from BP in a variant of uleb format. */ |
74 | |
75 | unsigned HOST_WIDE_INT |
76 | bp_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, nbits: 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 | |
95 | HOST_WIDE_INT |
96 | bp_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, nbits: 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 | |
117 | /* Pack REAL_VALUE_TYPE R into BP. */ |
118 | |
119 | void |
120 | bp_pack_real_value (struct bitpack_d *bp, const REAL_VALUE_TYPE *r) |
121 | { |
122 | bp_pack_value (bp, val: r->cl, nbits: 2); |
123 | bp_pack_value (bp, val: r->decimal, nbits: 1); |
124 | bp_pack_value (bp, val: r->sign, nbits: 1); |
125 | bp_pack_value (bp, val: r->signalling, nbits: 1); |
126 | bp_pack_value (bp, val: r->canonical, nbits: 1); |
127 | bp_pack_value (bp, val: r->uexp, EXP_BITS); |
128 | for (unsigned i = 0; i < SIGSZ; i++) |
129 | bp_pack_value (bp, val: r->sig[i], HOST_BITS_PER_LONG); |
130 | } |
131 | |
132 | /* Unpack REAL_VALUE_TYPE R from BP. */ |
133 | |
134 | void |
135 | bp_unpack_real_value (struct bitpack_d *bp, REAL_VALUE_TYPE *r) |
136 | { |
137 | /* Clear all bits of the real value type so that we can later do |
138 | bitwise comparisons to see if two values are the same. */ |
139 | memset (s: r, c: 0, n: sizeof (*r)); |
140 | r->cl = (unsigned) bp_unpack_value (bp, nbits: 2); |
141 | r->decimal = (unsigned) bp_unpack_value (bp, nbits: 1); |
142 | r->sign = (unsigned) bp_unpack_value (bp, nbits: 1); |
143 | r->signalling = (unsigned) bp_unpack_value (bp, nbits: 1); |
144 | r->canonical = (unsigned) bp_unpack_value (bp, nbits: 1); |
145 | r->uexp = (unsigned) bp_unpack_value (bp, EXP_BITS); |
146 | for (unsigned i = 0; i < SIGSZ; i++) |
147 | r->sig[i] = (unsigned long) bp_unpack_value (bp, HOST_BITS_PER_LONG); |
148 | } |
149 | |