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2541503d | 1 | /* Routines for restoring various data types from a file stream. This deals |
2 | with various data types like strings, integers, enums, etc. | |
3 | ||
d353bf18 | 4 | Copyright (C) 2011-2015 Free Software Foundation, Inc. |
2541503d | 5 | Contributed by Diego Novillo <dnovillo@google.com> |
6 | ||
7 | This file is part of GCC. | |
8 | ||
9 | GCC is free software; you can redistribute it and/or modify it under | |
10 | the terms of the GNU General Public License as published by the Free | |
11 | Software Foundation; either version 3, or (at your option) any later | |
12 | version. | |
13 | ||
14 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
15 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
16 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
17 | for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with GCC; see the file COPYING3. If not see | |
21 | <http://www.gnu.org/licenses/>. */ | |
22 | ||
23 | #include "config.h" | |
24 | #include "system.h" | |
25 | #include "coretypes.h" | |
26 | #include "diagnostic.h" | |
b20a8bb4 | 27 | #include "hash-set.h" |
b20a8bb4 | 28 | #include "vec.h" |
b20a8bb4 | 29 | #include "input.h" |
30 | #include "alias.h" | |
31 | #include "symtab.h" | |
32 | #include "options.h" | |
b20a8bb4 | 33 | #include "inchash.h" |
41a8aa41 | 34 | #include "tree.h" |
b20a8bb4 | 35 | #include "fold-const.h" |
94ea8568 | 36 | #include "predict.h" |
37 | #include "vec.h" | |
94ea8568 | 38 | #include "tm.h" |
39 | #include "hard-reg-set.h" | |
40 | #include "input.h" | |
41 | #include "function.h" | |
bc61cadb | 42 | #include "basic-block.h" |
43 | #include "tree-ssa-alias.h" | |
44 | #include "internal-fn.h" | |
45 | #include "gimple-expr.h" | |
46 | #include "is-a.h" | |
b23fb4cb | 47 | #include "gimple.h" |
1140c305 | 48 | #include "hash-map.h" |
49 | #include "plugin-api.h" | |
50 | #include "ipa-ref.h" | |
51 | #include "cgraph.h" | |
2541503d | 52 | #include "data-streamer.h" |
53 | ||
54 | /* Read a string from the string table in DATA_IN using input block | |
55 | IB. Write the length to RLEN. */ | |
56 | ||
b5054e4c | 57 | static const char * |
2541503d | 58 | string_for_index (struct data_in *data_in, unsigned int loc, unsigned int *rlen) |
59 | { | |
2541503d | 60 | unsigned int len; |
61 | const char *result; | |
62 | ||
63 | if (!loc) | |
64 | { | |
65 | *rlen = 0; | |
66 | return NULL; | |
67 | } | |
68 | ||
69 | /* Get the string stored at location LOC in DATA_IN->STRINGS. */ | |
2e971afd | 70 | lto_input_block str_tab (data_in->strings, loc - 1, data_in->strings_len, NULL); |
7f385784 | 71 | len = streamer_read_uhwi (&str_tab); |
2541503d | 72 | *rlen = len; |
73 | ||
74 | if (str_tab.p + len > data_in->strings_len) | |
75 | internal_error ("bytecode stream: string too long for the string table"); | |
76 | ||
77 | result = (const char *)(data_in->strings + str_tab.p); | |
78 | ||
79 | return result; | |
80 | } | |
81 | ||
82 | ||
83 | /* Read a string from the string table in DATA_IN using input block | |
84 | IB. Write the length to RLEN. */ | |
85 | ||
86 | const char * | |
7f385784 | 87 | streamer_read_indexed_string (struct data_in *data_in, |
88 | struct lto_input_block *ib, unsigned int *rlen) | |
2541503d | 89 | { |
7f385784 | 90 | return string_for_index (data_in, streamer_read_uhwi (ib), rlen); |
2541503d | 91 | } |
92 | ||
93 | ||
94 | /* Read a NULL terminated string from the string table in DATA_IN. */ | |
95 | ||
96 | const char * | |
7f385784 | 97 | streamer_read_string (struct data_in *data_in, struct lto_input_block *ib) |
2541503d | 98 | { |
99 | unsigned int len; | |
100 | const char *ptr; | |
101 | ||
7f385784 | 102 | ptr = streamer_read_indexed_string (data_in, ib, &len); |
2541503d | 103 | if (!ptr) |
104 | return NULL; | |
105 | if (ptr[len - 1] != '\0') | |
106 | internal_error ("bytecode stream: found non-null terminated string"); | |
107 | ||
108 | return ptr; | |
109 | } | |
110 | ||
111 | ||
07de37ab | 112 | /* Read a string from the string table in DATA_IN using the bitpack BP. |
113 | Write the length to RLEN. */ | |
114 | ||
115 | const char * | |
116 | bp_unpack_indexed_string (struct data_in *data_in, | |
117 | struct bitpack_d *bp, unsigned int *rlen) | |
118 | { | |
119 | return string_for_index (data_in, bp_unpack_var_len_unsigned (bp), rlen); | |
120 | } | |
121 | ||
122 | ||
123 | /* Read a NULL terminated string from the string table in DATA_IN. */ | |
124 | ||
125 | const char * | |
126 | bp_unpack_string (struct data_in *data_in, struct bitpack_d *bp) | |
127 | { | |
128 | unsigned int len; | |
129 | const char *ptr; | |
130 | ||
131 | ptr = bp_unpack_indexed_string (data_in, bp, &len); | |
132 | if (!ptr) | |
133 | return NULL; | |
134 | if (ptr[len - 1] != '\0') | |
135 | internal_error ("bytecode stream: found non-null terminated string"); | |
136 | ||
137 | return ptr; | |
138 | } | |
139 | ||
140 | ||
7f385784 | 141 | /* Read an unsigned HOST_WIDE_INT number from IB. */ |
2541503d | 142 | |
143 | unsigned HOST_WIDE_INT | |
7f385784 | 144 | streamer_read_uhwi (struct lto_input_block *ib) |
2541503d | 145 | { |
ab4542eb | 146 | unsigned HOST_WIDE_INT result; |
147 | int shift; | |
2541503d | 148 | unsigned HOST_WIDE_INT byte; |
ab4542eb | 149 | unsigned int p = ib->p; |
150 | unsigned int len = ib->len; | |
2541503d | 151 | |
ab4542eb | 152 | const char *data = ib->data; |
153 | result = data[p++]; | |
154 | if ((result & 0x80) != 0) | |
2541503d | 155 | { |
ab4542eb | 156 | result &= 0x7f; |
157 | shift = 7; | |
158 | do | |
159 | { | |
160 | byte = data[p++]; | |
161 | result |= (byte & 0x7f) << shift; | |
162 | shift += 7; | |
163 | } | |
164 | while ((byte & 0x80) != 0); | |
2541503d | 165 | } |
ab4542eb | 166 | |
167 | /* We check for section overrun after the fact for performance reason. */ | |
168 | if (p > len) | |
169 | lto_section_overrun (ib); | |
170 | ||
171 | ib->p = p; | |
172 | return result; | |
2541503d | 173 | } |
174 | ||
175 | ||
7f385784 | 176 | /* Read a HOST_WIDE_INT number from IB. */ |
2541503d | 177 | |
178 | HOST_WIDE_INT | |
7f385784 | 179 | streamer_read_hwi (struct lto_input_block *ib) |
2541503d | 180 | { |
181 | HOST_WIDE_INT result = 0; | |
182 | int shift = 0; | |
183 | unsigned HOST_WIDE_INT byte; | |
184 | ||
185 | while (true) | |
186 | { | |
7f385784 | 187 | byte = streamer_read_uchar (ib); |
2541503d | 188 | result |= (byte & 0x7f) << shift; |
189 | shift += 7; | |
190 | if ((byte & 0x80) == 0) | |
191 | { | |
192 | if ((shift < HOST_BITS_PER_WIDE_INT) && (byte & 0x40)) | |
d69521d8 | 193 | result |= - (HOST_WIDE_INT_1U << shift); |
2541503d | 194 | |
195 | return result; | |
196 | } | |
197 | } | |
198 | } | |
fc44a215 | 199 | |
200 | /* Read gcov_type value from IB. */ | |
201 | ||
202 | gcov_type | |
203 | streamer_read_gcov_count (struct lto_input_block *ib) | |
204 | { | |
205 | gcov_type ret = streamer_read_hwi (ib); | |
206 | gcc_assert (ret >= 0); | |
207 | return ret; | |
208 | } |