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1 | /* Routines for emitting GIMPLE to a file stream. |
2 | ||
3 | Copyright 2011 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 "tree.h" | |
26 | #include "tree-flow.h" | |
27 | #include "data-streamer.h" | |
28 | #include "gimple-streamer.h" | |
29 | #include "lto-streamer.h" | |
30 | ||
31 | /* Output PHI function PHI to the main stream in OB. */ | |
32 | ||
33 | static void | |
34 | output_phi (struct output_block *ob, gimple phi) | |
35 | { | |
36 | unsigned i, len = gimple_phi_num_args (phi); | |
37 | ||
38 | output_record_start (ob, lto_gimple_code_to_tag (GIMPLE_PHI)); | |
39 | output_uleb128 (ob, SSA_NAME_VERSION (PHI_RESULT (phi))); | |
40 | ||
41 | for (i = 0; i < len; i++) | |
42 | { | |
43 | lto_output_tree_ref (ob, gimple_phi_arg_def (phi, i)); | |
44 | output_uleb128 (ob, gimple_phi_arg_edge (phi, i)->src->index); | |
45 | lto_output_location (ob, gimple_phi_arg_location (phi, i)); | |
46 | } | |
47 | } | |
48 | ||
49 | ||
50 | /* Emit statement STMT on the main stream of output block OB. */ | |
51 | ||
52 | static void | |
53 | output_gimple_stmt (struct output_block *ob, gimple stmt) | |
54 | { | |
55 | unsigned i; | |
56 | enum gimple_code code; | |
57 | enum LTO_tags tag; | |
58 | struct bitpack_d bp; | |
59 | ||
60 | /* Emit identifying tag. */ | |
61 | code = gimple_code (stmt); | |
62 | tag = lto_gimple_code_to_tag (code); | |
63 | output_record_start (ob, tag); | |
64 | ||
65 | /* Emit the tuple header. */ | |
66 | bp = bitpack_create (ob->main_stream); | |
67 | bp_pack_var_len_unsigned (&bp, gimple_num_ops (stmt)); | |
68 | bp_pack_value (&bp, gimple_no_warning_p (stmt), 1); | |
69 | if (is_gimple_assign (stmt)) | |
70 | bp_pack_value (&bp, gimple_assign_nontemporal_move_p (stmt), 1); | |
71 | bp_pack_value (&bp, gimple_has_volatile_ops (stmt), 1); | |
72 | bp_pack_var_len_unsigned (&bp, stmt->gsbase.subcode); | |
73 | lto_output_bitpack (&bp); | |
74 | ||
75 | /* Emit location information for the statement. */ | |
76 | lto_output_location (ob, gimple_location (stmt)); | |
77 | ||
78 | /* Emit the lexical block holding STMT. */ | |
79 | lto_output_tree (ob, gimple_block (stmt), true); | |
80 | ||
81 | /* Emit the operands. */ | |
82 | switch (gimple_code (stmt)) | |
83 | { | |
84 | case GIMPLE_RESX: | |
85 | output_sleb128 (ob, gimple_resx_region (stmt)); | |
86 | break; | |
87 | ||
88 | case GIMPLE_EH_MUST_NOT_THROW: | |
89 | lto_output_tree_ref (ob, gimple_eh_must_not_throw_fndecl (stmt)); | |
90 | break; | |
91 | ||
92 | case GIMPLE_EH_DISPATCH: | |
93 | output_sleb128 (ob, gimple_eh_dispatch_region (stmt)); | |
94 | break; | |
95 | ||
96 | case GIMPLE_ASM: | |
97 | lto_output_uleb128_stream (ob->main_stream, gimple_asm_ninputs (stmt)); | |
98 | lto_output_uleb128_stream (ob->main_stream, gimple_asm_noutputs (stmt)); | |
99 | lto_output_uleb128_stream (ob->main_stream, gimple_asm_nclobbers (stmt)); | |
100 | lto_output_uleb128_stream (ob->main_stream, gimple_asm_nlabels (stmt)); | |
101 | lto_output_string (ob, ob->main_stream, gimple_asm_string (stmt), true); | |
102 | /* Fallthru */ | |
103 | ||
104 | case GIMPLE_ASSIGN: | |
105 | case GIMPLE_CALL: | |
106 | case GIMPLE_RETURN: | |
107 | case GIMPLE_SWITCH: | |
108 | case GIMPLE_LABEL: | |
109 | case GIMPLE_COND: | |
110 | case GIMPLE_GOTO: | |
111 | case GIMPLE_DEBUG: | |
112 | for (i = 0; i < gimple_num_ops (stmt); i++) | |
113 | { | |
114 | tree op = gimple_op (stmt, i); | |
115 | /* Wrap all uses of non-automatic variables inside MEM_REFs | |
116 | so that we do not have to deal with type mismatches on | |
117 | merged symbols during IL read in. The first operand | |
118 | of GIMPLE_DEBUG must be a decl, not MEM_REF, though. */ | |
119 | if (op && (i || !is_gimple_debug (stmt))) | |
120 | { | |
121 | tree *basep = &op; | |
122 | while (handled_component_p (*basep)) | |
123 | basep = &TREE_OPERAND (*basep, 0); | |
124 | if (TREE_CODE (*basep) == VAR_DECL | |
125 | && !auto_var_in_fn_p (*basep, current_function_decl) | |
126 | && !DECL_REGISTER (*basep)) | |
127 | { | |
128 | bool volatilep = TREE_THIS_VOLATILE (*basep); | |
129 | *basep = build2 (MEM_REF, TREE_TYPE (*basep), | |
130 | build_fold_addr_expr (*basep), | |
131 | build_int_cst (build_pointer_type | |
132 | (TREE_TYPE (*basep)), 0)); | |
133 | TREE_THIS_VOLATILE (*basep) = volatilep; | |
134 | } | |
135 | } | |
136 | lto_output_tree_ref (ob, op); | |
137 | } | |
138 | if (is_gimple_call (stmt)) | |
139 | { | |
140 | if (gimple_call_internal_p (stmt)) | |
141 | lto_output_enum (ob->main_stream, internal_fn, | |
142 | IFN_LAST, gimple_call_internal_fn (stmt)); | |
143 | else | |
144 | lto_output_tree_ref (ob, gimple_call_fntype (stmt)); | |
145 | } | |
146 | break; | |
147 | ||
148 | case GIMPLE_NOP: | |
149 | case GIMPLE_PREDICT: | |
150 | break; | |
151 | ||
152 | default: | |
153 | gcc_unreachable (); | |
154 | } | |
155 | } | |
156 | ||
157 | ||
158 | /* Output a basic block BB to the main stream in OB for this FN. */ | |
159 | ||
160 | void | |
161 | output_bb (struct output_block *ob, basic_block bb, struct function *fn) | |
162 | { | |
163 | gimple_stmt_iterator bsi = gsi_start_bb (bb); | |
164 | ||
165 | output_record_start (ob, | |
166 | (!gsi_end_p (bsi)) || phi_nodes (bb) | |
167 | ? LTO_bb1 | |
168 | : LTO_bb0); | |
169 | ||
170 | output_uleb128 (ob, bb->index); | |
171 | output_sleb128 (ob, bb->count); | |
172 | output_sleb128 (ob, bb->loop_depth); | |
173 | output_sleb128 (ob, bb->frequency); | |
174 | output_sleb128 (ob, bb->flags); | |
175 | ||
176 | if (!gsi_end_p (bsi) || phi_nodes (bb)) | |
177 | { | |
178 | /* Output the statements. The list of statements is terminated | |
179 | with a zero. */ | |
180 | for (bsi = gsi_start_bb (bb); !gsi_end_p (bsi); gsi_next (&bsi)) | |
181 | { | |
182 | int region; | |
183 | gimple stmt = gsi_stmt (bsi); | |
184 | ||
185 | output_gimple_stmt (ob, stmt); | |
186 | ||
187 | /* Emit the EH region holding STMT. */ | |
188 | region = lookup_stmt_eh_lp_fn (fn, stmt); | |
189 | if (region != 0) | |
190 | { | |
191 | output_record_start (ob, LTO_eh_region); | |
192 | output_sleb128 (ob, region); | |
193 | } | |
194 | else | |
195 | output_record_start (ob, LTO_null); | |
196 | } | |
197 | ||
198 | output_record_start (ob, LTO_null); | |
199 | ||
200 | for (bsi = gsi_start_phis (bb); !gsi_end_p (bsi); gsi_next (&bsi)) | |
201 | { | |
202 | gimple phi = gsi_stmt (bsi); | |
203 | ||
204 | /* Only emit PHIs for gimple registers. PHI nodes for .MEM | |
205 | will be filled in on reading when the SSA form is | |
206 | updated. */ | |
207 | if (is_gimple_reg (gimple_phi_result (phi))) | |
208 | output_phi (ob, phi); | |
209 | } | |
210 | ||
211 | output_record_start (ob, LTO_null); | |
212 | } | |
213 | } |