1 /* Routines for saving various data types to 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"
33 /* Adds a new block to output stream OBS. */
36 lto_append_block (struct lto_output_stream *obs)
38 struct lto_char_ptr_base *new_block;
40 gcc_assert (obs->left_in_block == 0);
42 if (obs->first_block == NULL)
44 /* This is the first time the stream has been written
46 obs->block_size = 1024;
47 new_block = (struct lto_char_ptr_base*) xmalloc (obs->block_size);
48 obs->first_block = new_block;
52 struct lto_char_ptr_base *tptr;
53 /* Get a new block that is twice as big as the last block
54 and link it into the list. */
56 new_block = (struct lto_char_ptr_base*) xmalloc (obs->block_size);
57 /* The first bytes of the block are reserved as a pointer to
58 the next block. Set the chain of the full block to the
59 pointer to the new block. */
60 tptr = obs->current_block;
61 tptr->ptr = (char *) new_block;
64 /* Set the place for the next char at the first position after the
65 chain to the next block. */
67 = ((char *) new_block) + sizeof (struct lto_char_ptr_base);
68 obs->current_block = new_block;
69 /* Null out the newly allocated block's pointer to the next block. */
70 new_block->ptr = NULL;
71 obs->left_in_block = obs->block_size - sizeof (struct lto_char_ptr_base);
75 /* Return index used to reference STRING of LEN characters in the string table
76 in OB. The string might or might not include a trailing '\0'.
77 Then put the index onto the INDEX_STREAM.
78 When PERSISTENT is set, the string S is supposed to not change during
79 duration of the OB and thus OB can keep pointer into it. */
82 streamer_string_index (struct output_block *ob, const char *s, unsigned int len,
85 struct string_slot **slot;
86 struct string_slot s_slot;
92 slot = ob->string_hash_table->find_slot (&s_slot, INSERT);
95 struct lto_output_stream *string_stream = ob->string_stream;
96 unsigned int start = string_stream->total_size;
97 struct string_slot *new_slot = XOBNEW (&ob->obstack, struct string_slot);
103 string = tmp = XOBNEWVEC (&ob->obstack, char, len);
104 memcpy (tmp, s, len);
109 new_slot->s = string;
111 new_slot->slot_num = start;
113 streamer_write_uhwi_stream (string_stream, len);
114 streamer_write_data_stream (string_stream, string, len);
119 struct string_slot *old_slot = *slot;
120 return old_slot->slot_num + 1;
125 /* Output STRING of LEN characters to the string table in OB. The
126 string might or might not include a trailing '\0'. Then put the
127 index onto the INDEX_STREAM.
128 When PERSISTENT is set, the string S is supposed to not change during
129 duration of the OB and thus OB can keep pointer into it. */
132 streamer_write_string_with_length (struct output_block *ob,
133 struct lto_output_stream *index_stream,
134 const char *s, unsigned int len,
138 streamer_write_uhwi_stream (index_stream,
139 streamer_string_index (ob, s, len, persistent));
141 streamer_write_char_stream (index_stream, 0);
145 /* Output the '\0' terminated STRING to the string
146 table in OB. Then put the index onto the INDEX_STREAM.
147 When PERSISTENT is set, the string S is supposed to not change during
148 duration of the OB and thus OB can keep pointer into it. */
151 streamer_write_string (struct output_block *ob,
152 struct lto_output_stream *index_stream,
153 const char *string, bool persistent)
156 streamer_write_string_with_length (ob, index_stream, string,
160 streamer_write_char_stream (index_stream, 0);
164 /* Output STRING of LEN characters to the string table in OB. Then
165 put the index into BP.
166 When PERSISTENT is set, the string S is supposed to not change during
167 duration of the OB and thus OB can keep pointer into it. */
170 bp_pack_string_with_length (struct output_block *ob, struct bitpack_d *bp,
171 const char *s, unsigned int len, bool persistent)
175 index = streamer_string_index (ob, s, len, persistent);
176 bp_pack_var_len_unsigned (bp, index);
180 /* Output the '\0' terminated STRING to the string
181 table in OB. Then put the index onto the bitpack BP.
182 When PERSISTENT is set, the string S is supposed to not change during
183 duration of the OB and thus OB can keep pointer into it. */
186 bp_pack_string (struct output_block *ob, struct bitpack_d *bp,
187 const char *s, bool persistent)
191 index = streamer_string_index (ob, s, strlen (s) + 1, persistent);
192 bp_pack_var_len_unsigned (bp, index);
197 /* Write a zero to the output stream. */
200 streamer_write_zero (struct output_block *ob)
202 streamer_write_char_stream (ob->main_stream, 0);
206 /* Write an unsigned HOST_WIDE_INT value WORK to OB->main_stream. */
209 streamer_write_uhwi (struct output_block *ob, unsigned HOST_WIDE_INT work)
211 streamer_write_uhwi_stream (ob->main_stream, work);
215 /* Write a HOST_WIDE_INT value WORK to OB->main_stream. */
218 streamer_write_hwi (struct output_block *ob, HOST_WIDE_INT work)
220 streamer_write_hwi_stream (ob->main_stream, work);
223 /* Write a gcov counter value WORK to OB->main_stream. */
226 streamer_write_gcov_count (struct output_block *ob, gcov_type work)
228 streamer_write_gcov_count_stream (ob->main_stream, work);
231 /* Write an unsigned HOST_WIDE_INT value WORK to OBS. */
234 streamer_write_uhwi_stream (struct lto_output_stream *obs,
235 unsigned HOST_WIDE_INT work)
237 if (obs->left_in_block == 0)
238 lto_append_block (obs);
239 char *current_pointer = obs->current_pointer;
240 unsigned int left_in_block = obs->left_in_block;
241 unsigned int size = 0;
244 unsigned int byte = (work & 0x7f);
247 /* More bytes to follow. */
250 *(current_pointer++) = byte;
254 while (work != 0 && left_in_block > 0);
257 obs->left_in_block = 0;
258 lto_append_block (obs);
259 current_pointer = obs->current_pointer;
260 left_in_block = obs->left_in_block;
263 unsigned int byte = (work & 0x7f);
266 /* More bytes to follow. */
269 *(current_pointer++) = byte;
275 obs->current_pointer = current_pointer;
276 obs->left_in_block = left_in_block;
277 obs->total_size += size;
281 /* Write a HOST_WIDE_INT value WORK to OBS. */
284 streamer_write_hwi_stream (struct lto_output_stream *obs, HOST_WIDE_INT work)
286 if (obs->left_in_block == 0)
287 lto_append_block (obs);
288 char *current_pointer = obs->current_pointer;
289 unsigned int left_in_block = obs->left_in_block;
290 unsigned int size = 0;
294 unsigned int byte = (work & 0x7f);
295 /* If the lower 7-bits are sign-extended 0 or -1 we are finished. */
297 more = !(work == 0 || work == -1);
300 /* More bits to follow. */
305 *(current_pointer++) = byte;
309 while (more && left_in_block > 0);
312 obs->left_in_block = 0;
313 lto_append_block (obs);
314 current_pointer = obs->current_pointer;
315 left_in_block = obs->left_in_block;
318 unsigned int byte = (work & 0x7f);
320 more = !(work == 0 || work == -1);
327 *(current_pointer++) = byte;
333 obs->current_pointer = current_pointer;
334 obs->left_in_block = left_in_block;
335 obs->total_size += size;
338 /* Write a GCOV counter value WORK to OBS. */
341 streamer_write_gcov_count_stream (struct lto_output_stream *obs, gcov_type work)
343 gcc_assert ((HOST_WIDE_INT) work == work);
344 streamer_write_hwi_stream (obs, work);
347 /* Write raw DATA of length LEN to the output block OB. */
350 streamer_write_data_stream (struct lto_output_stream *obs, const void *data,
358 if (obs->left_in_block == 0)
359 lto_append_block (obs);
361 /* Determine how many bytes to copy in this loop. */
362 if (len <= obs->left_in_block)
365 copy = obs->left_in_block;
367 /* Copy the data and do bookkeeping. */
368 memcpy (obs->current_pointer, data, copy);
369 obs->current_pointer += copy;
370 obs->total_size += copy;
371 obs->left_in_block -= copy;
372 data = (const char *) data + copy;
377 /* Emit the physical representation of wide_int VAL to output block OB. */
380 streamer_write_wide_int (struct output_block *ob, const wide_int &val)
382 int len = val.get_len ();
384 streamer_write_uhwi (ob, val.get_precision ());
385 streamer_write_uhwi (ob, len);
386 for (int i = 0; i < len; i++)
387 streamer_write_hwi (ob, val.elt (i));
390 /* Emit the physical representation of widest_int W to output block OB. */
393 streamer_write_widest_int (struct output_block *ob,
396 int len = w.get_len ();
398 streamer_write_uhwi (ob, w.get_precision ());
399 streamer_write_uhwi (ob, len);
400 for (int i = 0; i < len; i++)
401 streamer_write_hwi (ob, w.elt (i));