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) 2011-2015 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"
26 #include "diagnostic.h"
30 #include "double-int.h"
38 #include "fold-const.h"
42 #include "hard-reg-set.h"
45 #include "basic-block.h"
46 #include "tree-ssa-alias.h"
47 #include "internal-fn.h"
48 #include "gimple-expr.h"
52 #include "plugin-api.h"
55 #include "data-streamer.h"
57 /* Read a string from the string table in DATA_IN using input block
58 IB. Write the length to RLEN. */
61 string_for_index (struct data_in *data_in, unsigned int loc, unsigned int *rlen)
72 /* Get the string stored at location LOC in DATA_IN->STRINGS. */
73 lto_input_block str_tab (data_in->strings, loc - 1, data_in->strings_len);
74 len = streamer_read_uhwi (&str_tab);
77 if (str_tab.p + len > data_in->strings_len)
78 internal_error ("bytecode stream: string too long for the string table");
80 result = (const char *)(data_in->strings + str_tab.p);
86 /* Read a string from the string table in DATA_IN using input block
87 IB. Write the length to RLEN. */
90 streamer_read_indexed_string (struct data_in *data_in,
91 struct lto_input_block *ib, unsigned int *rlen)
93 return string_for_index (data_in, streamer_read_uhwi (ib), rlen);
97 /* Read a NULL terminated string from the string table in DATA_IN. */
100 streamer_read_string (struct data_in *data_in, struct lto_input_block *ib)
105 ptr = streamer_read_indexed_string (data_in, ib, &len);
108 if (ptr[len - 1] != '\0')
109 internal_error ("bytecode stream: found non-null terminated string");
115 /* Read a string from the string table in DATA_IN using the bitpack BP.
116 Write the length to RLEN. */
119 bp_unpack_indexed_string (struct data_in *data_in,
120 struct bitpack_d *bp, unsigned int *rlen)
122 return string_for_index (data_in, bp_unpack_var_len_unsigned (bp), rlen);
126 /* Read a NULL terminated string from the string table in DATA_IN. */
129 bp_unpack_string (struct data_in *data_in, struct bitpack_d *bp)
134 ptr = bp_unpack_indexed_string (data_in, bp, &len);
137 if (ptr[len - 1] != '\0')
138 internal_error ("bytecode stream: found non-null terminated string");
144 /* Read an unsigned HOST_WIDE_INT number from IB. */
146 unsigned HOST_WIDE_INT
147 streamer_read_uhwi (struct lto_input_block *ib)
149 unsigned HOST_WIDE_INT result;
151 unsigned HOST_WIDE_INT byte;
152 unsigned int p = ib->p;
153 unsigned int len = ib->len;
155 const char *data = ib->data;
157 if ((result & 0x80) != 0)
164 result |= (byte & 0x7f) << shift;
167 while ((byte & 0x80) != 0);
170 /* We check for section overrun after the fact for performance reason. */
172 lto_section_overrun (ib);
179 /* Read a HOST_WIDE_INT number from IB. */
182 streamer_read_hwi (struct lto_input_block *ib)
184 HOST_WIDE_INT result = 0;
186 unsigned HOST_WIDE_INT byte;
190 byte = streamer_read_uchar (ib);
191 result |= (byte & 0x7f) << shift;
193 if ((byte & 0x80) == 0)
195 if ((shift < HOST_BITS_PER_WIDE_INT) && (byte & 0x40))
196 result |= - (HOST_WIDE_INT_1U << shift);
203 /* Read gcov_type value from IB. */
206 streamer_read_gcov_count (struct lto_input_block *ib)
208 gcov_type ret = streamer_read_hwi (ib);
209 gcc_assert (ret >= 0);