1 /* Routines for restoring various data types from a file stream. This deals
2 with various data types like strings, integers, enums, etc.
4 Copyright (C) 2011-2016 Free Software Foundation, Inc.
5 Contributed by Diego Novillo <dnovillo@google.com>
7 This file is part of GCC.
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
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
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/>. */
25 #include "coretypes.h"
30 #include "data-streamer.h"
32 /* Read a string from the string table in DATA_IN using input block
33 IB. Write the length to RLEN. */
36 string_for_index (struct data_in *data_in, unsigned int loc, unsigned int *rlen)
47 /* Get the string stored at location LOC in DATA_IN->STRINGS. */
48 lto_input_block str_tab (data_in->strings, loc - 1, data_in->strings_len, NULL);
49 len = streamer_read_uhwi (&str_tab);
52 if (str_tab.p + len > data_in->strings_len)
53 internal_error ("bytecode stream: string too long for the string table");
55 result = (const char *)(data_in->strings + str_tab.p);
61 /* Read a string from the string table in DATA_IN using input block
62 IB. Write the length to RLEN. */
65 streamer_read_indexed_string (struct data_in *data_in,
66 struct lto_input_block *ib, unsigned int *rlen)
68 return string_for_index (data_in, streamer_read_uhwi (ib), rlen);
72 /* Read a NULL terminated string from the string table in DATA_IN. */
75 streamer_read_string (struct data_in *data_in, struct lto_input_block *ib)
80 ptr = streamer_read_indexed_string (data_in, ib, &len);
83 if (ptr[len - 1] != '\0')
84 internal_error ("bytecode stream: found non-null terminated string");
90 /* Read a string from the string table in DATA_IN using the bitpack BP.
91 Write the length to RLEN. */
94 bp_unpack_indexed_string (struct data_in *data_in,
95 struct bitpack_d *bp, unsigned int *rlen)
97 return string_for_index (data_in, bp_unpack_var_len_unsigned (bp), rlen);
101 /* Read a NULL terminated string from the string table in DATA_IN. */
104 bp_unpack_string (struct data_in *data_in, struct bitpack_d *bp)
109 ptr = bp_unpack_indexed_string (data_in, bp, &len);
112 if (ptr[len - 1] != '\0')
113 internal_error ("bytecode stream: found non-null terminated string");
119 /* Read an unsigned HOST_WIDE_INT number from IB. */
121 unsigned HOST_WIDE_INT
122 streamer_read_uhwi (struct lto_input_block *ib)
124 unsigned HOST_WIDE_INT result;
126 unsigned HOST_WIDE_INT byte;
127 unsigned int p = ib->p;
128 unsigned int len = ib->len;
130 const char *data = ib->data;
132 if ((result & 0x80) != 0)
139 result |= (byte & 0x7f) << shift;
142 while ((byte & 0x80) != 0);
145 /* We check for section overrun after the fact for performance reason. */
147 lto_section_overrun (ib);
154 /* Read a HOST_WIDE_INT number from IB. */
157 streamer_read_hwi (struct lto_input_block *ib)
159 HOST_WIDE_INT result = 0;
161 unsigned HOST_WIDE_INT byte;
165 byte = streamer_read_uchar (ib);
166 result |= (byte & 0x7f) << shift;
168 if ((byte & 0x80) == 0)
170 if ((shift < HOST_BITS_PER_WIDE_INT) && (byte & 0x40))
171 result |= - (HOST_WIDE_INT_1U << shift);
178 /* Read gcov_type value from IB. */
181 streamer_read_gcov_count (struct lto_input_block *ib)
183 gcov_type ret = streamer_read_hwi (ib);
184 gcc_assert (ret >= 0);