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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [gcc/] [data-streamer.h] - Blame information for rev 729

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1 684 jeremybenn
/* Generic streaming support for various data types.
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   Copyright 2011 Free Software Foundation, Inc.
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   Contributed by Diego Novillo <dnovillo@google.com>
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This file is part of GCC.
7
 
8
GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3.  If not see
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<http://www.gnu.org/licenses/>.  */
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#ifndef GCC_DATA_STREAMER_H
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#define GCC_DATA_STREAMER_H
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#include "vec.h"
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#include "lto-streamer.h"
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/* Data structures used to pack values and bitflags into a vector of
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   words.  Used to stream values of a fixed number of bits in a space
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   efficient way.  */
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static unsigned const BITS_PER_BITPACK_WORD = HOST_BITS_PER_WIDE_INT;
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33
typedef unsigned HOST_WIDE_INT bitpack_word_t;
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DEF_VEC_I(bitpack_word_t);
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DEF_VEC_ALLOC_I(bitpack_word_t, heap);
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struct bitpack_d
38
{
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  /* The position of the first unused or unconsumed bit in the word.  */
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  unsigned pos;
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  /* The current word we are (un)packing.  */
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  bitpack_word_t word;
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  /* The lto_output_stream or the lto_input_block we are streaming to/from.  */
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  void *stream;
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};
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49
 
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/* String hashing.  */
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struct string_slot
52
{
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  const char *s;
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  int len;
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  unsigned int slot_num;
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};
57
 
58
/* In data-streamer.c  */
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void bp_pack_var_len_unsigned (struct bitpack_d *, unsigned HOST_WIDE_INT);
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void bp_pack_var_len_int (struct bitpack_d *, HOST_WIDE_INT);
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unsigned HOST_WIDE_INT bp_unpack_var_len_unsigned (struct bitpack_d *);
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HOST_WIDE_INT bp_unpack_var_len_int (struct bitpack_d *);
63
 
64
/* In data-streamer-out.c  */
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void streamer_write_zero (struct output_block *);
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void streamer_write_uhwi (struct output_block *, unsigned HOST_WIDE_INT);
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void streamer_write_hwi (struct output_block *, HOST_WIDE_INT);
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void streamer_write_string (struct output_block *, struct lto_output_stream *,
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                            const char *, bool);
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unsigned streamer_string_index (struct output_block *, const char *,
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                                unsigned int, bool);
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void streamer_write_string_with_length (struct output_block *,
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                                        struct lto_output_stream *,
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                                        const char *, unsigned int, bool);
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void streamer_write_uhwi_stream (struct lto_output_stream *,
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                                 unsigned HOST_WIDE_INT);
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void streamer_write_hwi_stream (struct lto_output_stream *, HOST_WIDE_INT);
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79
/* In data-streamer-in.c  */
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const char *string_for_index (struct data_in *, unsigned int, unsigned int *);
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const char *streamer_read_string (struct data_in *, struct lto_input_block *);
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const char *streamer_read_indexed_string (struct data_in *,
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                                          struct lto_input_block *,
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                                          unsigned int *);
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unsigned HOST_WIDE_INT streamer_read_uhwi (struct lto_input_block *);
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HOST_WIDE_INT streamer_read_hwi (struct lto_input_block *);
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88
/* Returns a hash code for P.  Adapted from libiberty's htab_hash_string
89
   to support strings that may not end in '\0'.  */
90
 
91
static inline hashval_t
92
hash_string_slot_node (const void *p)
93
{
94
  const struct string_slot *ds = (const struct string_slot *) p;
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  hashval_t r = ds->len;
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  int i;
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98
  for (i = 0; i < ds->len; i++)
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     r = r * 67 + (unsigned)ds->s[i] - 113;
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  return r;
101
}
102
 
103
/* Returns nonzero if P1 and P2 are equal.  */
104
 
105
static inline int
106
eq_string_slot_node (const void *p1, const void *p2)
107
{
108
  const struct string_slot *ds1 = (const struct string_slot *) p1;
109
  const struct string_slot *ds2 = (const struct string_slot *) p2;
110
 
111
  if (ds1->len == ds2->len)
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    return memcmp (ds1->s, ds2->s, ds1->len) == 0;
113
 
114
  return 0;
115
}
116
 
117
/* Returns a new bit-packing context for bit-packing into S.  */
118
static inline struct bitpack_d
119
bitpack_create (struct lto_output_stream *s)
120
{
121
  struct bitpack_d bp;
122
  bp.pos = 0;
123
  bp.word = 0;
124
  bp.stream = (void *)s;
125
  return bp;
126
}
127
 
128
/* Pack the NBITS bit sized value VAL into the bit-packing context BP.  */
129
static inline void
130
bp_pack_value (struct bitpack_d *bp, bitpack_word_t val, unsigned nbits)
131
{
132
  bitpack_word_t word = bp->word;
133
  int pos = bp->pos;
134
 
135
  /* Verify that VAL fits in the NBITS.  */
136
  gcc_checking_assert (nbits == BITS_PER_BITPACK_WORD
137
                       || !(val & ~(((bitpack_word_t)1<<nbits)-1)));
138
 
139
  /* If val does not fit into the current bitpack word switch to the
140
     next one.  */
141
  if (pos + nbits > BITS_PER_BITPACK_WORD)
142
    {
143
      streamer_write_uhwi_stream ((struct lto_output_stream *) bp->stream,
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                                  word);
145
      word = val;
146
      pos = nbits;
147
    }
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  else
149
    {
150
      word |= val << pos;
151
      pos += nbits;
152
    }
153
  bp->word = word;
154
  bp->pos = pos;
155
}
156
 
157
/* Finishes bit-packing of BP.  */
158
static inline void
159
streamer_write_bitpack (struct bitpack_d *bp)
160
{
161
  streamer_write_uhwi_stream ((struct lto_output_stream *) bp->stream,
162
                              bp->word);
163
  bp->word = 0;
164
  bp->pos = 0;
165
}
166
 
167
/* Returns a new bit-packing context for bit-unpacking from IB.  */
168
static inline struct bitpack_d
169
streamer_read_bitpack (struct lto_input_block *ib)
170
{
171
  struct bitpack_d bp;
172
  bp.word = streamer_read_uhwi (ib);
173
  bp.pos = 0;
174
  bp.stream = (void *)ib;
175
  return bp;
176
}
177
 
178
/* Unpacks NBITS bits from the bit-packing context BP and returns them.  */
179
static inline bitpack_word_t
180
bp_unpack_value (struct bitpack_d *bp, unsigned nbits)
181
{
182
  bitpack_word_t mask, val;
183
  int pos = bp->pos;
184
 
185
  mask = (nbits == BITS_PER_BITPACK_WORD
186
          ? (bitpack_word_t) -1
187
          : ((bitpack_word_t) 1 << nbits) - 1);
188
 
189
  /* If there are not continuous nbits in the current bitpack word
190
     switch to the next one.  */
191
  if (pos + nbits > BITS_PER_BITPACK_WORD)
192
    {
193
      bp->word = val
194
        = streamer_read_uhwi ((struct lto_input_block *)bp->stream);
195
      bp->pos = nbits;
196
      return val & mask;
197
    }
198
  val = bp->word;
199
  val >>= pos;
200
  bp->pos = pos + nbits;
201
 
202
  return val & mask;
203
}
204
 
205
 
206
/* Write a character to the output block.  */
207
 
208
static inline void
209
streamer_write_char_stream (struct lto_output_stream *obs, char c)
210
{
211
  /* No space left.  */
212
  if (obs->left_in_block == 0)
213
    lto_append_block (obs);
214
 
215
  /* Write the actual character.  */
216
  *obs->current_pointer = c;
217
  obs->current_pointer++;
218
  obs->total_size++;
219
  obs->left_in_block--;
220
}
221
 
222
 
223
/* Read byte from the input block.  */
224
 
225
static inline unsigned char
226
streamer_read_uchar (struct lto_input_block *ib)
227
{
228
  if (ib->p >= ib->len)
229
    lto_section_overrun (ib);
230
  return (ib->data[ib->p++]);
231
}
232
 
233
/* Output VAL into OBS and verify it is in range MIN...MAX that is supposed
234
   to be compile time constant.
235
   Be host independent, limit range to 31bits.  */
236
 
237
static inline void
238
streamer_write_hwi_in_range (struct lto_output_stream *obs,
239
                                  HOST_WIDE_INT min,
240
                                  HOST_WIDE_INT max,
241
                                  HOST_WIDE_INT val)
242
{
243
  HOST_WIDE_INT range = max - min;
244
 
245
  gcc_checking_assert (val >= min && val <= max && range > 0
246
                       && range < 0x7fffffff);
247
 
248
  val -= min;
249
  streamer_write_char_stream (obs, val & 255);
250
  if (range >= 0xff)
251
    streamer_write_char_stream (obs, (val >> 8) & 255);
252
  if (range >= 0xffff)
253
    streamer_write_char_stream (obs, (val >> 16) & 255);
254
  if (range >= 0xffffff)
255
    streamer_write_char_stream (obs, (val >> 24) & 255);
256
}
257
 
258
/* Input VAL into OBS and verify it is in range MIN...MAX that is supposed
259
   to be compile time constant.  PURPOSE is used for error reporting.  */
260
 
261
static inline HOST_WIDE_INT
262
streamer_read_hwi_in_range (struct lto_input_block *ib,
263
                                 const char *purpose,
264
                                 HOST_WIDE_INT min,
265
                                 HOST_WIDE_INT max)
266
{
267
  HOST_WIDE_INT range = max - min;
268
  HOST_WIDE_INT val = streamer_read_uchar (ib);
269
 
270
  gcc_checking_assert (range > 0 && range < 0x7fffffff);
271
 
272
  if (range >= 0xff)
273
    val |= ((HOST_WIDE_INT)streamer_read_uchar (ib)) << 8;
274
  if (range >= 0xffff)
275
    val |= ((HOST_WIDE_INT)streamer_read_uchar (ib)) << 16;
276
  if (range >= 0xffffff)
277
    val |= ((HOST_WIDE_INT)streamer_read_uchar (ib)) << 24;
278
  val += min;
279
  if (val < min || val > max)
280
    lto_value_range_error (purpose, val, min, max);
281
  return val;
282
}
283
 
284
/* Output VAL into BP and verify it is in range MIN...MAX that is supposed
285
   to be compile time constant.
286
   Be host independent, limit range to 31bits.  */
287
 
288
static inline void
289
bp_pack_int_in_range (struct bitpack_d *bp,
290
                      HOST_WIDE_INT min,
291
                      HOST_WIDE_INT max,
292
                      HOST_WIDE_INT val)
293
{
294
  HOST_WIDE_INT range = max - min;
295
  int nbits = floor_log2 (range) + 1;
296
 
297
  gcc_checking_assert (val >= min && val <= max && range > 0
298
                       && range < 0x7fffffff);
299
 
300
  val -= min;
301
  bp_pack_value (bp, val, nbits);
302
}
303
 
304
/* Input VAL into BP and verify it is in range MIN...MAX that is supposed
305
   to be compile time constant.  PURPOSE is used for error reporting.  */
306
 
307
static inline HOST_WIDE_INT
308
bp_unpack_int_in_range (struct bitpack_d *bp,
309
                        const char *purpose,
310
                        HOST_WIDE_INT min,
311
                        HOST_WIDE_INT max)
312
{
313
  HOST_WIDE_INT range = max - min;
314
  int nbits = floor_log2 (range) + 1;
315
  HOST_WIDE_INT val = bp_unpack_value (bp, nbits);
316
 
317
  gcc_checking_assert (range > 0 && range < 0x7fffffff);
318
 
319
  if (val < min || val > max)
320
    lto_value_range_error (purpose, val, min, max);
321
  return val;
322
}
323
 
324
/* Output VAL of type "enum enum_name" into OBS.
325
   Assume range 0...ENUM_LAST - 1.  */
326
#define streamer_write_enum(obs,enum_name,enum_last,val) \
327
  streamer_write_hwi_in_range ((obs), 0, (int)(enum_last) - 1, (int)(val))
328
 
329
/* Input enum of type "enum enum_name" from IB.
330
   Assume range 0...ENUM_LAST - 1.  */
331
#define streamer_read_enum(ib,enum_name,enum_last) \
332
  (enum enum_name)streamer_read_hwi_in_range ((ib), #enum_name, 0, \
333
                                              (int)(enum_last) - 1)
334
 
335
/* Output VAL of type "enum enum_name" into BP.
336
   Assume range 0...ENUM_LAST - 1.  */
337
#define bp_pack_enum(bp,enum_name,enum_last,val) \
338
  bp_pack_int_in_range ((bp), 0, (int)(enum_last) - 1, (int)(val))
339
 
340
/* Input enum of type "enum enum_name" from BP.
341
   Assume range 0...ENUM_LAST - 1.  */
342
#define bp_unpack_enum(bp,enum_name,enum_last) \
343
  (enum enum_name)bp_unpack_int_in_range ((bp), #enum_name, 0, \
344
                                        (int)(enum_last) - 1)
345
 
346
/* Output the start of a record with TAG to output block OB.  */
347
 
348
static inline void
349
streamer_write_record_start (struct output_block *ob, enum LTO_tags tag)
350
{
351
  streamer_write_enum (ob->main_stream, LTO_tags, LTO_NUM_TAGS, tag);
352
}
353
 
354
/* Return the next tag in the input block IB.  */
355
 
356
static inline enum LTO_tags
357
streamer_read_record_start (struct lto_input_block *ib)
358
{
359
  return streamer_read_enum (ib, LTO_tags, LTO_NUM_TAGS);
360
}
361
 
362
#endif  /* GCC_DATA_STREAMER_H  */

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