1 /* Routines for emitting GIMPLE to a file stream.
2
3 Copyright (C) 2011-2021 Free Software Foundation, Inc.
4 Contributed by Diego Novillo <dnovillo@google.com>
5
6 This file is part of GCC.
7
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
11 version.
12
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
21
22 #include "config.h"
23 #include "system.h"
24 #include "coretypes.h"
25 #include "backend.h"
26 #include "tree.h"
27 #include "gimple.h"
28 #include "gimple-ssa.h"
29 #include "gimple-streamer.h"
30 #include "tree-eh.h"
31 #include "gimple-iterator.h"
32 #include "cgraph.h"
33 #include "value-prof.h"
34 #include "gimple-pretty-print.h"
35
36 /* Output PHI function PHI to the main stream in OB. */
37
38 static void
output_phi(struct output_block * ob,gphi * phi)39 output_phi (struct output_block *ob, gphi *phi)
40 {
41 unsigned i, len = gimple_phi_num_args (phi);
42
43 streamer_write_record_start (ob, lto_gimple_code_to_tag (GIMPLE_PHI));
44 streamer_write_uhwi (ob, SSA_NAME_VERSION (PHI_RESULT (phi)));
45
46 for (i = 0; i < len; i++)
47 {
48 stream_write_tree (ob, gimple_phi_arg_def (phi, i), true);
49 streamer_write_uhwi (ob, gimple_phi_arg_edge (phi, i)->src->index);
50 bitpack_d bp = bitpack_create (ob->main_stream);
51 location_t loc = gimple_phi_arg_location (phi, i);
52 stream_output_location_and_block (ob, &bp, loc);
53 }
54 }
55
56
57 /* Emit statement STMT on the main stream of output block OB. */
58
59 static void
output_gimple_stmt(struct output_block * ob,struct function * fn,gimple * stmt)60 output_gimple_stmt (struct output_block *ob, struct function *fn, gimple *stmt)
61 {
62 unsigned i;
63 enum gimple_code code;
64 enum LTO_tags tag;
65 struct bitpack_d bp;
66 histogram_value hist;
67
68 /* Emit identifying tag. */
69 code = gimple_code (stmt);
70 tag = lto_gimple_code_to_tag (code);
71 streamer_write_record_start (ob, tag);
72
73 /* Emit the tuple header. */
74 bp = bitpack_create (ob->main_stream);
75 bp_pack_var_len_unsigned (&bp, gimple_num_ops (stmt));
76 bp_pack_value (&bp, gimple_no_warning_p (stmt), 1);
77 if (is_gimple_assign (stmt))
78 bp_pack_value (&bp,
79 gimple_assign_nontemporal_move_p (
80 as_a <gassign *> (stmt)),
81 1);
82 bp_pack_value (&bp, gimple_has_volatile_ops (stmt), 1);
83 hist = gimple_histogram_value (fn, stmt);
84 bp_pack_value (&bp, hist != NULL, 1);
85 bp_pack_var_len_unsigned (&bp, stmt->subcode);
86
87 /* Emit location information for the statement, including gimple_block. */
88 stream_output_location_and_block (ob, &bp, gimple_location (stmt));
89
90 /* Emit the operands. */
91 switch (gimple_code (stmt))
92 {
93 case GIMPLE_RESX:
94 streamer_write_hwi (ob, gimple_resx_region (as_a <gresx *> (stmt)));
95 break;
96
97 case GIMPLE_EH_MUST_NOT_THROW:
98 stream_write_tree (ob,
99 gimple_eh_must_not_throw_fndecl (
100 as_a <geh_mnt *> (stmt)),
101 true);
102 break;
103
104 case GIMPLE_EH_DISPATCH:
105 streamer_write_hwi (ob,
106 gimple_eh_dispatch_region (
107 as_a <geh_dispatch *> (stmt)));
108 break;
109
110 case GIMPLE_ASM:
111 {
112 gasm *asm_stmt = as_a <gasm *> (stmt);
113 streamer_write_uhwi (ob, gimple_asm_ninputs (asm_stmt));
114 streamer_write_uhwi (ob, gimple_asm_noutputs (asm_stmt));
115 streamer_write_uhwi (ob, gimple_asm_nclobbers (asm_stmt));
116 streamer_write_uhwi (ob, gimple_asm_nlabels (asm_stmt));
117 streamer_write_string (ob, ob->main_stream,
118 gimple_asm_string (asm_stmt), true);
119 }
120 /* Fallthru */
121
122 case GIMPLE_ASSIGN:
123 case GIMPLE_CALL:
124 case GIMPLE_RETURN:
125 case GIMPLE_SWITCH:
126 case GIMPLE_LABEL:
127 case GIMPLE_COND:
128 case GIMPLE_GOTO:
129 case GIMPLE_DEBUG:
130 for (i = 0; i < gimple_num_ops (stmt); i++)
131 {
132 tree op = gimple_op (stmt, i);
133 tree *basep = NULL;
134 /* Wrap all uses of non-automatic variables inside MEM_REFs
135 so that we do not have to deal with type mismatches on
136 merged symbols during IL read in. The first operand
137 of GIMPLE_DEBUG must be a decl, not MEM_REF, though. */
138 if (!flag_wpa && op && (i || !is_gimple_debug (stmt)))
139 {
140 basep = &op;
141 if (TREE_CODE (*basep) == ADDR_EXPR)
142 basep = &TREE_OPERAND (*basep, 0);
143 while (handled_component_p (*basep))
144 basep = &TREE_OPERAND (*basep, 0);
145 if (VAR_P (*basep)
146 && !auto_var_in_fn_p (*basep, fn->decl)
147 && !DECL_REGISTER (*basep))
148 {
149 bool volatilep = TREE_THIS_VOLATILE (*basep);
150 tree ptrtype = build_pointer_type (TREE_TYPE (*basep));
151 *basep = build2 (MEM_REF, TREE_TYPE (*basep),
152 build1 (ADDR_EXPR, ptrtype, *basep),
153 build_int_cst (ptrtype, 0));
154 TREE_THIS_VOLATILE (*basep) = volatilep;
155 }
156 else
157 basep = NULL;
158 }
159 stream_write_tree (ob, op, true);
160 /* Restore the original base if we wrapped it inside a MEM_REF. */
161 if (basep)
162 *basep = TREE_OPERAND (TREE_OPERAND (*basep, 0), 0);
163 }
164 if (is_gimple_call (stmt))
165 {
166 if (gimple_call_internal_p (stmt))
167 streamer_write_enum (ob->main_stream, internal_fn,
168 IFN_LAST, gimple_call_internal_fn (stmt));
169 else
170 stream_write_tree (ob, gimple_call_fntype (stmt), true);
171 }
172 break;
173
174 case GIMPLE_NOP:
175 case GIMPLE_PREDICT:
176 break;
177
178 case GIMPLE_TRANSACTION:
179 {
180 gtransaction *txn = as_a <gtransaction *> (stmt);
181 gcc_assert (gimple_transaction_body (txn) == NULL);
182 stream_write_tree (ob, gimple_transaction_label_norm (txn), true);
183 stream_write_tree (ob, gimple_transaction_label_uninst (txn), true);
184 stream_write_tree (ob, gimple_transaction_label_over (txn), true);
185 }
186 break;
187
188 default:
189 gcc_unreachable ();
190 }
191 if (hist)
192 stream_out_histogram_value (ob, hist);
193 }
194
195
196 /* Output a basic block BB to the main stream in OB for this FN. */
197
198 void
output_bb(struct output_block * ob,basic_block bb,struct function * fn)199 output_bb (struct output_block *ob, basic_block bb, struct function *fn)
200 {
201 gimple_stmt_iterator bsi = gsi_start_bb (bb);
202
203 streamer_write_record_start (ob,
204 (!gsi_end_p (bsi)) || phi_nodes (bb)
205 ? LTO_bb1
206 : LTO_bb0);
207
208 streamer_write_uhwi (ob, bb->index);
209 bb->count.stream_out (ob);
210 streamer_write_hwi (ob, bb->flags);
211 streamer_write_hwi (ob, bb->discriminator);
212
213 if (!gsi_end_p (bsi) || phi_nodes (bb))
214 {
215 /* Output the statements. The list of statements is terminated
216 with a zero. */
217 for (bsi = gsi_start_bb (bb); !gsi_end_p (bsi); gsi_next (&bsi))
218 {
219 int region;
220 gimple *stmt = gsi_stmt (bsi);
221 if (streamer_dump_file)
222 {
223 fprintf (streamer_dump_file, " Streaming gimple stmt ");
224 print_gimple_stmt (streamer_dump_file, stmt, 0, TDF_SLIM);
225 }
226
227 output_gimple_stmt (ob, fn, stmt);
228
229 /* Emit the EH region holding STMT. */
230 region = lookup_stmt_eh_lp_fn (fn, stmt);
231 if (region != 0)
232 {
233 streamer_write_record_start (ob, LTO_eh_region);
234 streamer_write_hwi (ob, region);
235 }
236 else
237 streamer_write_record_start (ob, LTO_null);
238 }
239
240 streamer_write_record_start (ob, LTO_null);
241
242 for (gphi_iterator psi = gsi_start_phis (bb);
243 !gsi_end_p (psi);
244 gsi_next (&psi))
245 {
246 gphi *phi = psi.phi ();
247
248 /* Only emit PHIs for gimple registers. PHI nodes for .MEM
249 will be filled in on reading when the SSA form is
250 updated. */
251 if (!virtual_operand_p (gimple_phi_result (phi)))
252 output_phi (ob, phi);
253 }
254
255 streamer_write_record_start (ob, LTO_null);
256 }
257 }
258