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f4ebbd24 | 1 | /* Rich optional information on why an optimization wasn't possible. |
99dee823 | 2 | Copyright (C) 2018-2021 Free Software Foundation, Inc. |
f4ebbd24 DM |
3 | Contributed by David Malcolm <dmalcolm@redhat.com>. |
4 | ||
5 | This file is part of GCC. | |
6 | ||
7 | GCC is free software; you can redistribute it and/or modify it under | |
8 | the terms of the GNU General Public License as published by the Free | |
9 | Software Foundation; either version 3, or (at your option) any later | |
10 | version. | |
11 | ||
12 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 | for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GCC; see the file COPYING3. If not see | |
19 | <http://www.gnu.org/licenses/>. */ | |
20 | ||
21 | #include "config.h" | |
22 | #include "system.h" | |
23 | #include "coretypes.h" | |
24 | #include "backend.h" | |
25 | #include "tree.h" | |
26 | #include "gimple.h" | |
27 | #include "pretty-print.h" | |
28 | #include "opt-problem.h" | |
29 | #include "dump-context.h" | |
30 | #include "tree-pass.h" | |
31 | #include "selftest.h" | |
32 | ||
33 | /* opt_problem's ctor. | |
34 | ||
35 | Use FMT and AP to emit a message to the "immediate" dump destinations | |
36 | as if via: | |
37 | dump_printf_loc (MSG_MISSED_OPTIMIZATION, loc, ...) | |
38 | ||
39 | The optinfo_item instances are not emitted yet. Instead, they | |
40 | are retained internally so that the message can be replayed and | |
41 | emitted when this problem is handled, higher up the call stack. */ | |
42 | ||
43 | opt_problem::opt_problem (const dump_location_t &loc, | |
44 | const char *fmt, va_list *ap) | |
45 | : m_optinfo (loc, OPTINFO_KIND_FAILURE, current_pass) | |
46 | { | |
47 | /* We shouldn't be bothering to construct these objects if | |
48 | dumping isn't enabled. */ | |
49 | gcc_assert (dump_enabled_p ()); | |
50 | ||
51 | /* Update the singleton. */ | |
52 | delete s_the_problem; | |
53 | s_the_problem = this; | |
54 | ||
55 | /* Print the location to the "immediate" dump destinations. */ | |
56 | dump_context &dc = dump_context::get (); | |
3da39f52 | 57 | dc.dump_loc (MSG_MISSED_OPTIMIZATION, loc.get_user_location ()); |
f4ebbd24 DM |
58 | |
59 | /* Print the formatted string to this opt_problem's optinfo, dumping | |
60 | the items to the "immediate" dump destinations, and storing items | |
61 | for later retrieval. */ | |
62 | { | |
63 | dump_pretty_printer pp (&dump_context::get (), MSG_MISSED_OPTIMIZATION); | |
64 | ||
65 | text_info text; | |
66 | text.err_no = errno; | |
67 | text.args_ptr = ap; | |
68 | text.format_spec = fmt; /* No i18n is performed. */ | |
69 | ||
70 | /* Phases 1 and 2, using pp_format. */ | |
71 | pp_format (&pp, &text); | |
72 | ||
73 | /* Phase 3: dump the items to the "immediate" dump destinations, | |
74 | and storing them into m_optinfo for later retrieval. */ | |
75 | pp.emit_items (&m_optinfo); | |
76 | } | |
77 | } | |
78 | ||
79 | /* Emit this problem and delete it, clearing the current opt_problem. */ | |
80 | ||
81 | void | |
82 | opt_problem::emit_and_clear () | |
83 | { | |
84 | gcc_assert (this == s_the_problem); | |
85 | ||
86 | m_optinfo.emit_for_opt_problem (); | |
87 | ||
88 | delete this; | |
89 | s_the_problem = NULL; | |
90 | } | |
91 | ||
92 | /* The singleton opt_problem *. */ | |
93 | ||
94 | opt_problem *opt_problem::s_the_problem; | |
95 | ||
96 | #if CHECKING_P | |
97 | ||
98 | namespace selftest { | |
99 | ||
100 | static opt_result | |
101 | function_that_succeeds () | |
102 | { | |
103 | return opt_result::success (); | |
104 | } | |
105 | ||
106 | /* Verify that opt_result::success works. */ | |
107 | ||
108 | static void | |
109 | test_opt_result_success () | |
110 | { | |
111 | /* Run all tests twice, with and then without dumping enabled. */ | |
112 | for (int i = 0 ; i < 2; i++) | |
113 | { | |
114 | bool with_dumping = (i == 0); | |
115 | ||
116 | temp_dump_context tmp (with_dumping, with_dumping, | |
117 | MSG_ALL_KINDS | MSG_ALL_PRIORITIES); | |
118 | ||
119 | if (with_dumping) | |
120 | gcc_assert (dump_enabled_p ()); | |
121 | else | |
122 | gcc_assert (!dump_enabled_p ()); | |
123 | ||
124 | opt_result res = function_that_succeeds (); | |
125 | ||
126 | /* Verify that "success" can be used as a "true" boolean. */ | |
127 | ASSERT_TRUE (res); | |
128 | ||
129 | /* Verify the underlying opt_wrapper<bool>. */ | |
130 | ASSERT_TRUE (res.get_result ()); | |
131 | ASSERT_EQ (res.get_problem (), NULL); | |
132 | ||
133 | /* Nothing should have been dumped. */ | |
134 | ASSERT_DUMPED_TEXT_EQ (tmp, ""); | |
135 | optinfo *info = tmp.get_pending_optinfo (); | |
136 | ASSERT_EQ (info, NULL); | |
137 | } | |
138 | } | |
139 | ||
140 | /* Example of a function that fails, with a non-trivial | |
141 | pre-canned error message. */ | |
142 | ||
143 | static opt_result | |
144 | function_that_fails (const greturn *stmt) | |
145 | { | |
146 | gcc_assert (stmt); | |
147 | gcc_assert (gimple_return_retval (stmt)); | |
148 | ||
149 | AUTO_DUMP_SCOPE ("function_that_fails", stmt); | |
150 | ||
151 | return opt_result::failure_at (stmt, | |
152 | "can't handle return type: %T for stmt: %G", | |
153 | TREE_TYPE (gimple_return_retval (stmt)), | |
154 | static_cast <const gimple *> (stmt)); | |
155 | } | |
156 | ||
157 | /* Example of a function that indirectly fails. */ | |
158 | ||
159 | static opt_result | |
160 | function_that_indirectly_fails (const greturn *stmt) | |
161 | { | |
162 | AUTO_DUMP_SCOPE ("function_that_indirectly_fails", stmt); | |
163 | ||
164 | opt_result res = function_that_fails (stmt); | |
165 | if (!res) | |
166 | return res; | |
167 | return opt_result::success (); | |
168 | } | |
169 | ||
170 | /* Verify that opt_result::failure_at works. | |
171 | Simulate a failure handling a stmt at one location whilst considering | |
172 | an optimization that's notionally at another location (as a microcosm | |
173 | of e.g. a problematic statement within a loop that prevents loop | |
174 | vectorization). */ | |
175 | ||
176 | static void | |
177 | test_opt_result_failure_at (const line_table_case &case_) | |
178 | { | |
179 | /* Generate a location_t for testing. */ | |
180 | line_table_test ltt (case_); | |
181 | const line_map_ordinary *ord_map | |
182 | = linemap_check_ordinary (linemap_add (line_table, LC_ENTER, false, | |
183 | "test.c", 0)); | |
184 | linemap_line_start (line_table, 5, 100); | |
185 | ||
186 | /* A test location: "test.c:5:10". */ | |
187 | const location_t line_5 = linemap_position_for_column (line_table, 10); | |
188 | ||
189 | /* Another test location: "test.c:6:12". */ | |
190 | const location_t line_6 | |
191 | = linemap_position_for_line_and_column (line_table, ord_map, 6, 12); | |
192 | ||
193 | if (line_6 > LINE_MAP_MAX_LOCATION_WITH_COLS) | |
194 | return; | |
195 | ||
196 | /* Generate statements using "line_5" and "line_6" for testing. */ | |
197 | greturn *stmt_at_5 = gimple_build_return (integer_one_node); | |
198 | gimple_set_location (stmt_at_5, line_5); | |
199 | ||
200 | greturn *stmt_at_6 = gimple_build_return (integer_zero_node); | |
201 | gimple_set_location (stmt_at_6, line_6); | |
202 | ||
203 | /* Run with and then without dumping enabled. */ | |
204 | for (int i = 0; i < 2; i++) | |
205 | { | |
206 | bool with_dumping = (i == 0); | |
207 | ||
208 | /* Run with all 4 combinations of | |
209 | with and without MSG_PRIORITY_INTERNALS and | |
210 | with and without MSG_PRIORITY_REEMITTED. */ | |
211 | for (int j = 0; j < 4; j++) | |
212 | { | |
213 | dump_flags_t filter = MSG_ALL_KINDS | MSG_PRIORITY_USER_FACING; | |
214 | if (j / 2) | |
215 | filter |= MSG_PRIORITY_INTERNALS; | |
216 | if (j % 2) | |
217 | filter |= MSG_PRIORITY_REEMITTED; | |
218 | ||
219 | temp_dump_context tmp (with_dumping, with_dumping, filter); | |
220 | ||
221 | if (with_dumping) | |
222 | gcc_assert (dump_enabled_p ()); | |
223 | else | |
224 | gcc_assert (!dump_enabled_p ()); | |
225 | ||
226 | /* Simulate attempting to optimize "stmt_at_6". */ | |
227 | opt_result res = function_that_indirectly_fails (stmt_at_6); | |
228 | ||
229 | /* Verify that "failure" can be used as a "false" boolean. */ | |
230 | ASSERT_FALSE (res); | |
231 | ||
232 | /* Verify the underlying opt_wrapper<bool>. */ | |
233 | ASSERT_FALSE (res.get_result ()); | |
234 | opt_problem *problem = res.get_problem (); | |
235 | ||
236 | if (with_dumping) | |
237 | { | |
238 | ASSERT_NE (problem, NULL); | |
239 | ASSERT_EQ (problem->get_dump_location ().get_location_t (), | |
240 | line_6); | |
241 | #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8) | |
242 | /* Verify that the problem captures the implementation location | |
243 | it was emitted from. */ | |
244 | const dump_impl_location_t &impl_location | |
245 | = problem->get_dump_location ().get_impl_location (); | |
246 | ASSERT_STR_CONTAINS (impl_location.m_function, | |
247 | "function_that_fails"); | |
248 | #endif | |
249 | ||
250 | /* Verify that the underlying dump items are retained in the | |
251 | opt_problem. */ | |
252 | const optinfo &info = problem->get_optinfo (); | |
253 | ASSERT_EQ (info.get_dump_location ().get_location_t (), line_6); | |
254 | ASSERT_EQ (info.num_items (), 4); | |
255 | ASSERT_IS_TEXT (info.get_item (0), "can't handle return type: "); | |
256 | ASSERT_IS_TREE (info.get_item (1), UNKNOWN_LOCATION, "int"); | |
257 | ASSERT_IS_TEXT (info.get_item (2), " for stmt: "); | |
258 | ASSERT_IS_GIMPLE (info.get_item (3), line_6, "return 0;\n"); | |
259 | ||
260 | /* ...but not in the dump_context's pending_optinfo. */ | |
261 | ASSERT_EQ (tmp.get_pending_optinfo (), NULL); | |
262 | ||
263 | /* Simulate emitting a high-level summary message, followed | |
264 | by the problem. */ | |
265 | dump_printf_loc (MSG_MISSED_OPTIMIZATION, stmt_at_5, | |
266 | "can't optimize loop\n"); | |
267 | problem->emit_and_clear (); | |
268 | ASSERT_EQ (res.get_problem (), NULL); | |
269 | ||
270 | /* Verify that the error message was dumped (when the failure | |
271 | occurred). We can't use a switch here as not all of the | |
272 | values are const expressions (using C++98). */ | |
273 | dump_flags_t effective_filter | |
274 | = filter & (MSG_PRIORITY_INTERNALS | MSG_PRIORITY_REEMITTED); | |
275 | if (effective_filter | |
276 | == (MSG_PRIORITY_INTERNALS | MSG_PRIORITY_REEMITTED)) | |
277 | /* The -fopt-info-internals case. */ | |
278 | ASSERT_DUMPED_TEXT_EQ | |
279 | (tmp, | |
280 | "test.c:6:12: note: === function_that_indirectly_fails" | |
281 | " ===\n" | |
282 | "test.c:6:12: note: === function_that_fails ===\n" | |
283 | "test.c:6:12: missed: can't handle return type: int" | |
284 | " for stmt: return 0;\n" | |
285 | "test.c:5:10: missed: can't optimize loop\n" | |
286 | "test.c:6:12: missed: can't handle return type: int" | |
287 | " for stmt: return 0;\n"); | |
288 | else if (effective_filter == MSG_PRIORITY_INTERNALS) | |
289 | /* The default for dump files. */ | |
290 | ASSERT_DUMPED_TEXT_EQ | |
291 | (tmp, | |
292 | "test.c:6:12: note: === function_that_indirectly_fails" | |
293 | " ===\n" | |
294 | "test.c:6:12: note: === function_that_fails ===\n" | |
295 | "test.c:6:12: missed: can't handle return type: int" | |
296 | " for stmt: return 0;\n" | |
297 | "test.c:5:10: missed: can't optimize loop\n"); | |
298 | else if (effective_filter == MSG_PRIORITY_REEMITTED) | |
299 | /* The default when -fopt-info is enabled. */ | |
300 | ASSERT_DUMPED_TEXT_EQ | |
301 | (tmp, | |
302 | "test.c:5:10: missed: can't optimize loop\n" | |
303 | "test.c:6:12: missed: can't handle return type: int" | |
304 | " for stmt: return 0;\n"); | |
305 | else | |
306 | { | |
307 | gcc_assert (effective_filter == 0); | |
308 | ASSERT_DUMPED_TEXT_EQ | |
309 | (tmp, | |
310 | "test.c:5:10: missed: can't optimize loop\n"); | |
311 | } | |
312 | } | |
313 | else | |
314 | { | |
315 | /* If dumping was disabled, then no problem should have been | |
316 | created, and nothing should have been dumped. */ | |
317 | ASSERT_EQ (problem, NULL); | |
318 | ASSERT_DUMPED_TEXT_EQ (tmp, ""); | |
319 | } | |
320 | } | |
321 | } | |
322 | } | |
323 | ||
324 | /* Run all of the selftests within this file. */ | |
325 | ||
326 | void | |
327 | opt_problem_cc_tests () | |
328 | { | |
329 | test_opt_result_success (); | |
330 | for_each_line_table_case (test_opt_result_failure_at); | |
331 | } | |
332 | ||
333 | } // namespace selftest | |
334 | ||
335 | #endif /* CHECKING_P */ |