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) 2011-2018 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
);
187 /* Read the physical representation of a wide_int val from
191 streamer_read_wide_int (struct lto_input_block
*ib
)
193 HOST_WIDE_INT a
[WIDE_INT_MAX_ELTS
];
195 int prec
= streamer_read_uhwi (ib
);
196 int len
= streamer_read_uhwi (ib
);
197 for (i
= 0; i
< len
; i
++)
198 a
[i
] = streamer_read_hwi (ib
);
199 return wide_int::from_array (a
, len
, prec
);
202 /* Read the physical representation of a widest_int val from
206 streamer_read_widest_int (struct lto_input_block
*ib
)
208 HOST_WIDE_INT a
[WIDE_INT_MAX_ELTS
];
210 int prec ATTRIBUTE_UNUSED
= streamer_read_uhwi (ib
);
211 int len
= streamer_read_uhwi (ib
);
212 for (i
= 0; i
< len
; i
++)
213 a
[i
] = streamer_read_hwi (ib
);
214 return widest_int::from_array (a
, len
);