summaryrefslogtreecommitdiff
path: root/gcc/gimple-streamer-in.c
blob: 7b1bf5805ceb0b1ec91b8c163ad7c97071a00e9f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
/* Routines for reading GIMPLE from a file stream.

   Copyright (C) 2011-2015 Free Software Foundation, Inc.
   Contributed by Diego Novillo <dnovillo@google.com>

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.

GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>.  */

#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "diagnostic.h"
#include "tree.h"
#include "predict.h"
#include "vec.h"
#include "hashtab.h"
#include "hash-set.h"
#include "machmode.h"
#include "tm.h"
#include "hard-reg-set.h"
#include "input.h"
#include "function.h"
#include "dominance.h"
#include "cfg.h"
#include "basic-block.h"
#include "tree-ssa-alias.h"
#include "internal-fn.h"
#include "tree-eh.h"
#include "gimple-expr.h"
#include "is-a.h"
#include "gimple.h"
#include "gimple-iterator.h"
#include "gimple-ssa.h"
#include "tree-phinodes.h"
#include "stringpool.h"
#include "tree-ssanames.h"
#include "hash-map.h"
#include "plugin-api.h"
#include "ipa-ref.h"
#include "cgraph.h"
#include "data-streamer.h"
#include "tree-streamer.h"
#include "gimple-streamer.h"
#include "value-prof.h"

/* Read a PHI function for basic block BB in function FN.  DATA_IN is
   the file being read.  IB is the input block to use for reading.  */

static gphi *
input_phi (struct lto_input_block *ib, basic_block bb, struct data_in *data_in,
	   struct function *fn)
{
  unsigned HOST_WIDE_INT ix;
  tree phi_result;
  int i, len;
  gphi *result;

  ix = streamer_read_uhwi (ib);
  phi_result = (*SSANAMES (fn))[ix];
  len = EDGE_COUNT (bb->preds);
  result = create_phi_node (phi_result, bb);

  /* We have to go through a lookup process here because the preds in the
     reconstructed graph are generally in a different order than they
     were in the original program.  */
  for (i = 0; i < len; i++)
    {
      tree def = stream_read_tree (ib, data_in);
      int src_index = streamer_read_uhwi (ib);
      bitpack_d bp = streamer_read_bitpack (ib);
      location_t arg_loc = stream_input_location (&bp, data_in);
      basic_block sbb = BASIC_BLOCK_FOR_FN (fn, src_index);

      edge e = NULL;
      int j;

      for (j = 0; j < len; j++)
	if (EDGE_PRED (bb, j)->src == sbb)
	  {
	    e = EDGE_PRED (bb, j);
	    break;
	  }

      add_phi_arg (result, def, e, arg_loc);
    }

  return result;
}


/* Read a statement with tag TAG in function FN from block IB using
   descriptors in DATA_IN.  */

static gimple
input_gimple_stmt (struct lto_input_block *ib, struct data_in *data_in,
		   enum LTO_tags tag)
{
  gimple stmt;
  enum gimple_code code;
  unsigned HOST_WIDE_INT num_ops;
  size_t i;
  struct bitpack_d bp;
  bool has_hist;

  code = lto_tag_to_gimple_code (tag);

  /* Read the tuple header.  */
  bp = streamer_read_bitpack (ib);
  num_ops = bp_unpack_var_len_unsigned (&bp);
  stmt = gimple_alloc (code, num_ops);
  stmt->no_warning = bp_unpack_value (&bp, 1);
  if (is_gimple_assign (stmt))
    stmt->nontemporal_move = bp_unpack_value (&bp, 1);
  stmt->has_volatile_ops = bp_unpack_value (&bp, 1);
  has_hist = bp_unpack_value (&bp, 1);
  stmt->subcode = bp_unpack_var_len_unsigned (&bp);

  /* Read location information.  */
  gimple_set_location (stmt, stream_input_location (&bp, data_in));

  /* Read lexical block reference.  */
  gimple_set_block (stmt, stream_read_tree (ib, data_in));

  /* Read in all the operands.  */
  switch (code)
    {
    case GIMPLE_RESX:
      gimple_resx_set_region (as_a <gresx *> (stmt),
			      streamer_read_hwi (ib));
      break;

    case GIMPLE_EH_MUST_NOT_THROW:
      gimple_eh_must_not_throw_set_fndecl (
	as_a <geh_mnt *> (stmt),
	stream_read_tree (ib, data_in));
      break;

    case GIMPLE_EH_DISPATCH:
      gimple_eh_dispatch_set_region (as_a <geh_dispatch *> (stmt),
				     streamer_read_hwi (ib));
      break;

    case GIMPLE_ASM:
      {
	/* FIXME lto.  Move most of this into a new gimple_asm_set_string().  */
	gasm *asm_stmt = as_a <gasm *> (stmt);
	tree str;
	asm_stmt->ni = streamer_read_uhwi (ib);
	asm_stmt->no = streamer_read_uhwi (ib);
	asm_stmt->nc = streamer_read_uhwi (ib);
	asm_stmt->nl = streamer_read_uhwi (ib);
	str = streamer_read_string_cst (data_in, ib);
	asm_stmt->string = TREE_STRING_POINTER (str);
      }
      /* Fallthru  */

    case GIMPLE_ASSIGN:
    case GIMPLE_CALL:
    case GIMPLE_RETURN:
    case GIMPLE_SWITCH:
    case GIMPLE_LABEL:
    case GIMPLE_COND:
    case GIMPLE_GOTO:
    case GIMPLE_DEBUG:
      for (i = 0; i < num_ops; i++)
	{
	  tree *opp, op = stream_read_tree (ib, data_in);
	  gimple_set_op (stmt, i, op);
	  if (!op)
	    continue;

	  opp = gimple_op_ptr (stmt, i);
	  if (TREE_CODE (*opp) == ADDR_EXPR)
	    opp = &TREE_OPERAND (*opp, 0);
	  while (handled_component_p (*opp))
	    opp = &TREE_OPERAND (*opp, 0);
	  /* At LTO output time we wrap all global decls in MEM_REFs to
	     allow seamless replacement with prevailing decls.  Undo this
	     here if the prevailing decl allows for this.
	     ???  Maybe we should simply fold all stmts.  */
	  if (TREE_CODE (*opp) == MEM_REF
	      && TREE_CODE (TREE_OPERAND (*opp, 0)) == ADDR_EXPR
	      && integer_zerop (TREE_OPERAND (*opp, 1))
	      && (TREE_THIS_VOLATILE (*opp)
		  == TREE_THIS_VOLATILE
		       (TREE_OPERAND (TREE_OPERAND (*opp, 0), 0)))
	      && !TYPE_REF_CAN_ALIAS_ALL (TREE_TYPE (TREE_OPERAND (*opp, 1)))
	      && (TREE_TYPE (*opp)
		  == TREE_TYPE (TREE_TYPE (TREE_OPERAND (*opp, 1))))
	      && (TREE_TYPE (*opp)
		  == TREE_TYPE (TREE_OPERAND (TREE_OPERAND (*opp, 0), 0))))
	    *opp = TREE_OPERAND (TREE_OPERAND (*opp, 0), 0);
	}
      if (gcall *call_stmt = dyn_cast <gcall *> (stmt))
	{
	  if (gimple_call_internal_p (call_stmt))
	    gimple_call_set_internal_fn
	      (call_stmt, streamer_read_enum (ib, internal_fn, IFN_LAST));
	  else
	    gimple_call_set_fntype (call_stmt, stream_read_tree (ib, data_in));
	}
      break;

    case GIMPLE_NOP:
    case GIMPLE_PREDICT:
      break;

    case GIMPLE_TRANSACTION:
      gimple_transaction_set_label (as_a <gtransaction *> (stmt),
				    stream_read_tree (ib, data_in));
      break;

    default:
      internal_error ("bytecode stream: unknown GIMPLE statement tag %s",
		      lto_tag_name (tag));
    }

  /* Update the properties of symbols, SSA names and labels associated
     with STMT.  */
  if (code == GIMPLE_ASSIGN || code == GIMPLE_CALL)
    {
      tree lhs = gimple_get_lhs (stmt);
      if (lhs && TREE_CODE (lhs) == SSA_NAME)
	SSA_NAME_DEF_STMT (lhs) = stmt;
    }
  else if (code == GIMPLE_ASM)
    {
      gasm *asm_stmt = as_a <gasm *> (stmt);
      unsigned i;

      for (i = 0; i < gimple_asm_noutputs (asm_stmt); i++)
	{
	  tree op = TREE_VALUE (gimple_asm_output_op (asm_stmt, i));
	  if (TREE_CODE (op) == SSA_NAME)
	    SSA_NAME_DEF_STMT (op) = stmt;
	}
    }

  /* Reset alias information.  */
  if (code == GIMPLE_CALL)
    gimple_call_reset_alias_info (as_a <gcall *> (stmt));

  /* Mark the statement modified so its operand vectors can be filled in.  */
  gimple_set_modified (stmt, true);
  if (has_hist)
    stream_in_histogram_value (ib, stmt);

  return stmt;
}


/* Read a basic block with tag TAG from DATA_IN using input block IB.
   FN is the function being processed.  */

void
input_bb (struct lto_input_block *ib, enum LTO_tags tag,
	  struct data_in *data_in, struct function *fn,
	  int count_materialization_scale)
{
  unsigned int index;
  basic_block bb;
  gimple_stmt_iterator bsi;

  /* This routine assumes that CFUN is set to FN, as it needs to call
     basic GIMPLE routines that use CFUN.  */
  gcc_assert (cfun == fn);

  index = streamer_read_uhwi (ib);
  bb = BASIC_BLOCK_FOR_FN (fn, index);

  bb->count = apply_scale (streamer_read_gcov_count (ib),
                           count_materialization_scale);
  bb->frequency = streamer_read_hwi (ib);
  bb->flags = streamer_read_hwi (ib);

  /* LTO_bb1 has statements.  LTO_bb0 does not.  */
  if (tag == LTO_bb0)
    return;

  bsi = gsi_start_bb (bb);
  tag = streamer_read_record_start (ib);
  while (tag)
    {
      gimple stmt = input_gimple_stmt (ib, data_in, tag);
      gsi_insert_after (&bsi, stmt, GSI_NEW_STMT);

      /* After the statement, expect a 0 delimiter or the EH region
	 that the previous statement belongs to.  */
      tag = streamer_read_record_start (ib);
      lto_tag_check_set (tag, 2, LTO_eh_region, LTO_null);

      if (tag == LTO_eh_region)
	{
	  HOST_WIDE_INT region = streamer_read_hwi (ib);
	  gcc_assert (region == (int) region);
	  add_stmt_to_eh_lp (stmt, region);
	}

      tag = streamer_read_record_start (ib);
    }

  tag = streamer_read_record_start (ib);
  while (tag)
    {
      input_phi (ib, bb, data_in, fn);
      tag = streamer_read_record_start (ib);
    }
}