Daily bump.
[official-gcc.git] / gcc / data-streamer-out.c
blob6ed4a5148c04606551a263b1902c4870907f7df1
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) 2011-2021 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
12 version.
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.
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/>. */
23 #include "config.h"
24 #include "system.h"
25 #include "coretypes.h"
26 #include "backend.h"
27 #include "tree.h"
28 #include "gimple.h"
29 #include "cgraph.h"
30 #include "data-streamer.h"
33 /* Adds a new block to output stream OBS. */
35 void
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
45 into. */
46 obs->block_size = 1024;
47 new_block = (struct lto_char_ptr_base*) xmalloc (obs->block_size);
48 obs->first_block = new_block;
50 else
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. */
55 obs->block_size *= 2;
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. */
66 obs->current_pointer
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. */
81 static unsigned
82 streamer_string_index (struct output_block *ob, const char *s, unsigned int len,
83 bool persistent)
85 struct string_slot **slot;
86 struct string_slot s_slot;
88 s_slot.s = s;
89 s_slot.len = len;
90 s_slot.slot_num = 0;
92 slot = ob->string_hash_table->find_slot (&s_slot, INSERT);
93 if (*slot == NULL)
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);
98 const char *string;
100 if (!persistent)
102 char *tmp;
103 string = tmp = XOBNEWVEC (&ob->obstack, char, len);
104 memcpy (tmp, s, len);
106 else
107 string = s;
109 new_slot->s = string;
110 new_slot->len = len;
111 new_slot->slot_num = start;
112 *slot = new_slot;
113 streamer_write_uhwi_stream (string_stream, len);
114 streamer_write_data_stream (string_stream, string, len);
115 return start + 1;
117 else
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. */
131 void
132 streamer_write_string_with_length (struct output_block *ob,
133 struct lto_output_stream *index_stream,
134 const char *s, unsigned int len,
135 bool persistent)
137 if (s)
138 streamer_write_uhwi_stream (index_stream,
139 streamer_string_index (ob, s, len, persistent));
140 else
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. */
150 void
151 streamer_write_string (struct output_block *ob,
152 struct lto_output_stream *index_stream,
153 const char *string, bool persistent)
155 if (string)
156 streamer_write_string_with_length (ob, index_stream, string,
157 strlen (string) + 1,
158 persistent);
159 else
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. */
169 void
170 bp_pack_string_with_length (struct output_block *ob, struct bitpack_d *bp,
171 const char *s, unsigned int len, bool persistent)
173 unsigned index = 0;
174 if (s)
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. */
185 void
186 bp_pack_string (struct output_block *ob, struct bitpack_d *bp,
187 const char *s, bool persistent)
189 unsigned index = 0;
190 if (s)
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. */
199 void
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. */
208 void
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. */
217 void
218 streamer_write_hwi (struct output_block *ob, HOST_WIDE_INT work)
220 streamer_write_hwi_stream (ob->main_stream, work);
223 /* Write a poly_uint64 value WORK to OB->main_stream. */
225 void
226 streamer_write_poly_uint64 (struct output_block *ob, poly_uint64 work)
228 for (int i = 0; i < NUM_POLY_INT_COEFFS; ++i)
229 streamer_write_uhwi_stream (ob->main_stream, work.coeffs[i]);
232 /* Write a poly_int64 value WORK to OB->main_stream. */
234 void
235 streamer_write_poly_int64 (struct output_block *ob, poly_int64 work)
237 for (int i = 0; i < NUM_POLY_INT_COEFFS; ++i)
238 streamer_write_hwi_stream (ob->main_stream, work.coeffs[i]);
241 /* Write a gcov counter value WORK to OB->main_stream. */
243 void
244 streamer_write_gcov_count (struct output_block *ob, gcov_type work)
246 streamer_write_gcov_count_stream (ob->main_stream, work);
249 /* Write an unsigned HOST_WIDE_INT value WORK to OBS. */
251 void
252 streamer_write_uhwi_stream (struct lto_output_stream *obs,
253 unsigned HOST_WIDE_INT work)
255 if (obs->left_in_block == 0)
256 lto_append_block (obs);
257 char *current_pointer = obs->current_pointer;
258 unsigned int left_in_block = obs->left_in_block;
259 unsigned int size = 0;
262 unsigned int byte = (work & 0x7f);
263 work >>= 7;
264 if (work != 0)
265 /* More bytes to follow. */
266 byte |= 0x80;
268 *(current_pointer++) = byte;
269 left_in_block--;
270 size++;
272 while (work != 0 && left_in_block > 0);
273 if (work != 0)
275 obs->left_in_block = 0;
276 lto_append_block (obs);
277 current_pointer = obs->current_pointer;
278 left_in_block = obs->left_in_block;
281 unsigned int byte = (work & 0x7f);
282 work >>= 7;
283 if (work != 0)
284 /* More bytes to follow. */
285 byte |= 0x80;
287 *(current_pointer++) = byte;
288 left_in_block--;
289 size++;
291 while (work != 0);
293 obs->current_pointer = current_pointer;
294 obs->left_in_block = left_in_block;
295 obs->total_size += size;
299 /* Write a HOST_WIDE_INT value WORK to OBS. */
301 void
302 streamer_write_hwi_stream (struct lto_output_stream *obs, HOST_WIDE_INT work)
304 if (obs->left_in_block == 0)
305 lto_append_block (obs);
306 char *current_pointer = obs->current_pointer;
307 unsigned int left_in_block = obs->left_in_block;
308 unsigned int size = 0;
309 bool more;
312 unsigned int byte = (work & 0x7f);
313 /* If the lower 7-bits are sign-extended 0 or -1 we are finished. */
314 work >>= 6;
315 more = !(work == 0 || work == -1);
316 if (more)
318 /* More bits to follow. */
319 work >>= 1;
320 byte |= 0x80;
323 *(current_pointer++) = byte;
324 left_in_block--;
325 size++;
327 while (more && left_in_block > 0);
328 if (more)
330 obs->left_in_block = 0;
331 lto_append_block (obs);
332 current_pointer = obs->current_pointer;
333 left_in_block = obs->left_in_block;
336 unsigned int byte = (work & 0x7f);
337 work >>= 6;
338 more = !(work == 0 || work == -1);
339 if (more)
341 work >>= 1;
342 byte |= 0x80;
345 *(current_pointer++) = byte;
346 left_in_block--;
347 size++;
349 while (more);
351 obs->current_pointer = current_pointer;
352 obs->left_in_block = left_in_block;
353 obs->total_size += size;
356 /* Write a GCOV counter value WORK to OBS. */
358 void
359 streamer_write_gcov_count_stream (struct lto_output_stream *obs, gcov_type work)
361 gcc_assert ((HOST_WIDE_INT) work == work);
362 streamer_write_hwi_stream (obs, work);
365 /* Write raw DATA of length LEN to the output block OB. */
367 void
368 streamer_write_data_stream (struct lto_output_stream *obs, const void *data,
369 size_t len)
371 while (len)
373 size_t copy;
375 /* No space left. */
376 if (obs->left_in_block == 0)
377 lto_append_block (obs);
379 /* Determine how many bytes to copy in this loop. */
380 if (len <= obs->left_in_block)
381 copy = len;
382 else
383 copy = obs->left_in_block;
385 /* Copy the data and do bookkeeping. */
386 memcpy (obs->current_pointer, data, copy);
387 obs->current_pointer += copy;
388 obs->total_size += copy;
389 obs->left_in_block -= copy;
390 data = (const char *) data + copy;
391 len -= copy;
395 /* Emit the physical representation of wide_int VAL to output block OB. */
397 void
398 streamer_write_wide_int (struct output_block *ob, const wide_int &val)
400 int len = val.get_len ();
402 streamer_write_uhwi (ob, val.get_precision ());
403 streamer_write_uhwi (ob, len);
404 for (int i = 0; i < len; i++)
405 streamer_write_hwi (ob, val.elt (i));
408 /* Emit the physical representation of widest_int W to output block OB. */
410 void
411 streamer_write_widest_int (struct output_block *ob,
412 const widest_int &w)
414 int len = w.get_len ();
416 streamer_write_uhwi (ob, w.get_precision ());
417 streamer_write_uhwi (ob, len);
418 for (int i = 0; i < len; i++)
419 streamer_write_hwi (ob, w.elt (i));