jit: document union types
[official-gcc.git] / gcc / gimple-streamer-out.c
blobb1389fc3f0126448df8dcfb88d5e6b36a8f01e2b
1 /* Routines for emitting GIMPLE to a file stream.
3 Copyright (C) 2011-2015 Free Software Foundation, Inc.
4 Contributed by Diego Novillo <dnovillo@google.com>
6 This file is part of GCC.
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.
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.
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/>. */
22 #include "config.h"
23 #include "system.h"
24 #include "coretypes.h"
25 #include "alias.h"
26 #include "symtab.h"
27 #include "options.h"
28 #include "tree.h"
29 #include "fold-const.h"
30 #include "predict.h"
31 #include "tm.h"
32 #include "hard-reg-set.h"
33 #include "function.h"
34 #include "basic-block.h"
35 #include "tree-ssa-alias.h"
36 #include "internal-fn.h"
37 #include "tree-eh.h"
38 #include "gimple-expr.h"
39 #include "gimple.h"
40 #include "gimple-iterator.h"
41 #include "gimple-ssa.h"
42 #include "cgraph.h"
43 #include "data-streamer.h"
44 #include "gimple-streamer.h"
45 #include "lto-streamer.h"
46 #include "tree-streamer.h"
47 #include "value-prof.h"
49 /* Output PHI function PHI to the main stream in OB. */
51 static void
52 output_phi (struct output_block *ob, gphi *phi)
54 unsigned i, len = gimple_phi_num_args (phi);
56 streamer_write_record_start (ob, lto_gimple_code_to_tag (GIMPLE_PHI));
57 streamer_write_uhwi (ob, SSA_NAME_VERSION (PHI_RESULT (phi)));
59 for (i = 0; i < len; i++)
61 stream_write_tree (ob, gimple_phi_arg_def (phi, i), true);
62 streamer_write_uhwi (ob, gimple_phi_arg_edge (phi, i)->src->index);
63 bitpack_d bp = bitpack_create (ob->main_stream);
64 stream_output_location (ob, &bp, gimple_phi_arg_location (phi, i));
65 streamer_write_bitpack (&bp);
70 /* Emit statement STMT on the main stream of output block OB. */
72 static void
73 output_gimple_stmt (struct output_block *ob, gimple stmt)
75 unsigned i;
76 enum gimple_code code;
77 enum LTO_tags tag;
78 struct bitpack_d bp;
79 histogram_value hist;
81 /* Emit identifying tag. */
82 code = gimple_code (stmt);
83 tag = lto_gimple_code_to_tag (code);
84 streamer_write_record_start (ob, tag);
86 /* Emit the tuple header. */
87 bp = bitpack_create (ob->main_stream);
88 bp_pack_var_len_unsigned (&bp, gimple_num_ops (stmt));
89 bp_pack_value (&bp, gimple_no_warning_p (stmt), 1);
90 if (is_gimple_assign (stmt))
91 bp_pack_value (&bp,
92 gimple_assign_nontemporal_move_p (
93 as_a <gassign *> (stmt)),
94 1);
95 bp_pack_value (&bp, gimple_has_volatile_ops (stmt), 1);
96 hist = gimple_histogram_value (cfun, stmt);
97 bp_pack_value (&bp, hist != NULL, 1);
98 bp_pack_var_len_unsigned (&bp, stmt->subcode);
100 /* Emit location information for the statement. */
101 stream_output_location (ob, &bp, LOCATION_LOCUS (gimple_location (stmt)));
102 streamer_write_bitpack (&bp);
104 /* Emit the lexical block holding STMT. */
105 stream_write_tree (ob, gimple_block (stmt), true);
107 /* Emit the operands. */
108 switch (gimple_code (stmt))
110 case GIMPLE_RESX:
111 streamer_write_hwi (ob, gimple_resx_region (as_a <gresx *> (stmt)));
112 break;
114 case GIMPLE_EH_MUST_NOT_THROW:
115 stream_write_tree (ob,
116 gimple_eh_must_not_throw_fndecl (
117 as_a <geh_mnt *> (stmt)),
118 true);
119 break;
121 case GIMPLE_EH_DISPATCH:
122 streamer_write_hwi (ob,
123 gimple_eh_dispatch_region (
124 as_a <geh_dispatch *> (stmt)));
125 break;
127 case GIMPLE_ASM:
129 gasm *asm_stmt = as_a <gasm *> (stmt);
130 streamer_write_uhwi (ob, gimple_asm_ninputs (asm_stmt));
131 streamer_write_uhwi (ob, gimple_asm_noutputs (asm_stmt));
132 streamer_write_uhwi (ob, gimple_asm_nclobbers (asm_stmt));
133 streamer_write_uhwi (ob, gimple_asm_nlabels (asm_stmt));
134 streamer_write_string (ob, ob->main_stream,
135 gimple_asm_string (asm_stmt), true);
137 /* Fallthru */
139 case GIMPLE_ASSIGN:
140 case GIMPLE_CALL:
141 case GIMPLE_RETURN:
142 case GIMPLE_SWITCH:
143 case GIMPLE_LABEL:
144 case GIMPLE_COND:
145 case GIMPLE_GOTO:
146 case GIMPLE_DEBUG:
147 for (i = 0; i < gimple_num_ops (stmt); i++)
149 tree op = gimple_op (stmt, i);
150 tree *basep = NULL;
151 /* Wrap all uses of non-automatic variables inside MEM_REFs
152 so that we do not have to deal with type mismatches on
153 merged symbols during IL read in. The first operand
154 of GIMPLE_DEBUG must be a decl, not MEM_REF, though. */
155 if (op && (i || !is_gimple_debug (stmt)))
157 basep = &op;
158 if (TREE_CODE (*basep) == ADDR_EXPR)
159 basep = &TREE_OPERAND (*basep, 0);
160 while (handled_component_p (*basep))
161 basep = &TREE_OPERAND (*basep, 0);
162 if (TREE_CODE (*basep) == VAR_DECL
163 && !auto_var_in_fn_p (*basep, current_function_decl)
164 && !DECL_REGISTER (*basep))
166 bool volatilep = TREE_THIS_VOLATILE (*basep);
167 tree ptrtype = build_pointer_type (TREE_TYPE (*basep));
168 *basep = build2 (MEM_REF, TREE_TYPE (*basep),
169 build1 (ADDR_EXPR, ptrtype, *basep),
170 build_int_cst (ptrtype, 0));
171 TREE_THIS_VOLATILE (*basep) = volatilep;
173 else
174 basep = NULL;
176 stream_write_tree (ob, op, true);
177 /* Restore the original base if we wrapped it inside a MEM_REF. */
178 if (basep)
179 *basep = TREE_OPERAND (TREE_OPERAND (*basep, 0), 0);
181 if (is_gimple_call (stmt))
183 if (gimple_call_internal_p (stmt))
184 streamer_write_enum (ob->main_stream, internal_fn,
185 IFN_LAST, gimple_call_internal_fn (stmt));
186 else
187 stream_write_tree (ob, gimple_call_fntype (stmt), true);
189 break;
191 case GIMPLE_NOP:
192 case GIMPLE_PREDICT:
193 break;
195 case GIMPLE_TRANSACTION:
197 gtransaction *trans_stmt = as_a <gtransaction *> (stmt);
198 gcc_assert (gimple_transaction_body (trans_stmt) == NULL);
199 stream_write_tree (ob, gimple_transaction_label (trans_stmt), true);
201 break;
203 default:
204 gcc_unreachable ();
206 if (hist)
207 stream_out_histogram_value (ob, hist);
211 /* Output a basic block BB to the main stream in OB for this FN. */
213 void
214 output_bb (struct output_block *ob, basic_block bb, struct function *fn)
216 gimple_stmt_iterator bsi = gsi_start_bb (bb);
218 streamer_write_record_start (ob,
219 (!gsi_end_p (bsi)) || phi_nodes (bb)
220 ? LTO_bb1
221 : LTO_bb0);
223 streamer_write_uhwi (ob, bb->index);
224 streamer_write_gcov_count (ob, bb->count);
225 streamer_write_hwi (ob, bb->frequency);
226 streamer_write_hwi (ob, bb->flags);
228 if (!gsi_end_p (bsi) || phi_nodes (bb))
230 /* Output the statements. The list of statements is terminated
231 with a zero. */
232 for (bsi = gsi_start_bb (bb); !gsi_end_p (bsi); gsi_next (&bsi))
234 int region;
235 gimple stmt = gsi_stmt (bsi);
237 output_gimple_stmt (ob, stmt);
239 /* Emit the EH region holding STMT. */
240 region = lookup_stmt_eh_lp_fn (fn, stmt);
241 if (region != 0)
243 streamer_write_record_start (ob, LTO_eh_region);
244 streamer_write_hwi (ob, region);
246 else
247 streamer_write_record_start (ob, LTO_null);
250 streamer_write_record_start (ob, LTO_null);
252 for (gphi_iterator psi = gsi_start_phis (bb);
253 !gsi_end_p (psi);
254 gsi_next (&psi))
256 gphi *phi = psi.phi ();
258 /* Only emit PHIs for gimple registers. PHI nodes for .MEM
259 will be filled in on reading when the SSA form is
260 updated. */
261 if (!virtual_operand_p (gimple_phi_result (phi)))
262 output_phi (ob, phi);
265 streamer_write_record_start (ob, LTO_null);