1 /*
2 * Copyright (c) 2015, 2020, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "code/relocInfo.hpp"
27 #include "compiler/compilerDefinitions.hpp"
28 #include "compiler/compilerDirectives.hpp"
29 #include "oops/metadata.hpp"
30 #include "runtime/os.hpp"
31 #include "interpreter/invocationCounter.hpp"
32 #include "runtime/arguments.hpp"
33 #include "runtime/flags/jvmFlag.hpp"
34 #include "runtime/flags/jvmFlagConstraintsCompiler.hpp"
35 #include "runtime/globals.hpp"
36 #include "runtime/globals_extension.hpp"
37 #include "utilities/powerOfTwo.hpp"
38
39 JVMFlag::Error AliasLevelConstraintFunc(intx value, bool verbose) {
40 if ((value <= 1) && (Arguments::mode() == Arguments::_comp || Arguments::mode() == Arguments::_mixed)) {
41 JVMFlag::printError(verbose,
42 "AliasLevel (" INTX_FORMAT ") is not "
43 "compatible with -Xcomp or -Xmixed\n",
44 value);
45 return JVMFlag::VIOLATES_CONSTRAINT;
46 } else {
47 return JVMFlag::SUCCESS;
48 }
49 }
50
51 /**
52 * Validate the minimum number of compiler threads needed to run the
53 * JVM. The following configurations are possible.
54 *
55 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
56 * compiler threads is 0.
57 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
58 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
59 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
60 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
61 * C1 can be used, so the minimum number of compiler threads is 1.
62 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
63 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
64 * the minimum number of compiler threads is 2.
65 * 5) Non-tiered emulation mode is on. CompilationModeFlag::disable_intermediate() == true.
66 * The minimum number of threads is 2. But if CompilationModeFlag::quick_internal() == false, then it's 1.
67 */
68 JVMFlag::Error CICompilerCountConstraintFunc(intx value, bool verbose) {
69 int min_number_of_compiler_threads = 0;
70 #if !defined(COMPILER1) && !defined(COMPILER2) && !INCLUDE_JVMCI
71 // case 1
72 #elif defined(TIERED)
73 if (TieredCompilation) {
74 if (TieredStopAtLevel < CompLevel_full_optimization || CompilationModeFlag::quick_only()) {
75 min_number_of_compiler_threads = 1; // case 3
76 } else if (CompilationModeFlag::disable_intermediate()) {
77 // case 5
78 if (CompilationModeFlag::quick_internal()) {
79 min_number_of_compiler_threads = 2;
80 } else {
81 min_number_of_compiler_threads = 1;
82 }
83 } else {
84 min_number_of_compiler_threads = 2; // case 4 (tiered)
85 }
86 } else {
87 min_number_of_compiler_threads = 1; // case 2
88 }
89 #else
90 min_number_of_compiler_threads = 1; // case 2
91 #endif
92
93 // The default CICompilerCount's value is CI_COMPILER_COUNT.
94 // With a client VM, -XX:+TieredCompilation causes TieredCompilation
95 // to be true here (the option is validated later) and
96 // min_number_of_compiler_threads to exceed CI_COMPILER_COUNT.
97 min_number_of_compiler_threads = MIN2(min_number_of_compiler_threads, CI_COMPILER_COUNT);
98
99 if (value < (intx)min_number_of_compiler_threads) {
100 JVMFlag::printError(verbose,
101 "CICompilerCount (" INTX_FORMAT ") must be "
102 "at least %d \n",
103 value, min_number_of_compiler_threads);
104 return JVMFlag::VIOLATES_CONSTRAINT;
105 } else {
106 return JVMFlag::SUCCESS;
107 }
108 }
109
110 JVMFlag::Error AllocatePrefetchDistanceConstraintFunc(intx value, bool verbose) {
111 if (value < 0 || value > 512) {
112 JVMFlag::printError(verbose,
113 "AllocatePrefetchDistance (" INTX_FORMAT ") must be "
114 "between 0 and %d\n",
115 AllocatePrefetchDistance, 512);
116 return JVMFlag::VIOLATES_CONSTRAINT;
117 }
118
119 return JVMFlag::SUCCESS;
120 }
121
122 JVMFlag::Error AllocatePrefetchStepSizeConstraintFunc(intx value, bool verbose) {
123 if (AllocatePrefetchStyle == 3) {
124 if (value % wordSize != 0) {
125 JVMFlag::printError(verbose,
126 "AllocatePrefetchStepSize (" INTX_FORMAT ") must be multiple of %d\n",
127 value, wordSize);
128 return JVMFlag::VIOLATES_CONSTRAINT;
129 }
130 }
131 return JVMFlag::SUCCESS;
132 }
133
134 JVMFlag::Error AllocatePrefetchInstrConstraintFunc(intx value, bool verbose) {
135 intx max_value = max_intx;
136 #if defined(X86)
137 max_value = 3;
138 #endif
139 if (value < 0 || value > max_value) {
140 JVMFlag::printError(verbose,
141 "AllocatePrefetchInstr (" INTX_FORMAT ") must be "
142 "between 0 and " INTX_FORMAT "\n", value, max_value);
143 return JVMFlag::VIOLATES_CONSTRAINT;
144 }
145
146 return JVMFlag::SUCCESS;
147 }
148
149 JVMFlag::Error CompileThresholdConstraintFunc(intx value, bool verbose) {
150 if (value < 0 || value > INT_MAX >> InvocationCounter::count_shift) {
151 JVMFlag::printError(verbose,
152 "CompileThreshold (" INTX_FORMAT ") "
153 "must be between 0 and %d\n",
154 value,
155 INT_MAX >> InvocationCounter::count_shift);
156 return JVMFlag::VIOLATES_CONSTRAINT;
157 }
158
159 return JVMFlag::SUCCESS;
160 }
161
162 JVMFlag::Error OnStackReplacePercentageConstraintFunc(intx value, bool verbose) {
163 int64_t max_percentage_limit = INT_MAX;
164 if (!ProfileInterpreter) {
165 max_percentage_limit = (max_percentage_limit>>InvocationCounter::count_shift);
166 }
167 max_percentage_limit = CompileThreshold == 0 ? max_percentage_limit*100 : max_percentage_limit*100/CompileThreshold;
168
169 if (ProfileInterpreter) {
170 if (value < InterpreterProfilePercentage) {
171 JVMFlag::printError(verbose,
172 "OnStackReplacePercentage (" INTX_FORMAT ") must be "
173 "larger than InterpreterProfilePercentage (" INTX_FORMAT ")\n",
174 value, InterpreterProfilePercentage);
175 return JVMFlag::VIOLATES_CONSTRAINT;
176 }
177
178 max_percentage_limit += InterpreterProfilePercentage;
179 if (value > max_percentage_limit) {
180 JVMFlag::printError(verbose,
181 "OnStackReplacePercentage (" INTX_FORMAT ") must be between 0 and " INT64_FORMAT "\n",
182 value,
183 max_percentage_limit);
184 return JVMFlag::VIOLATES_CONSTRAINT;
185 }
186 } else {
187 if (value < 0) {
188 JVMFlag::printError(verbose,
189 "OnStackReplacePercentage (" INTX_FORMAT ") must be "
190 "non-negative\n", value);
191 return JVMFlag::VIOLATES_CONSTRAINT;
192 }
193
194 if (value > max_percentage_limit) {
195 JVMFlag::printError(verbose,
196 "OnStackReplacePercentage (" INTX_FORMAT ") must be between 0 and " INT64_FORMAT "\n",
197 value,
198 max_percentage_limit);
199 return JVMFlag::VIOLATES_CONSTRAINT;
200 }
201 }
202 return JVMFlag::SUCCESS;
203 }
204
205 JVMFlag::Error CodeCacheSegmentSizeConstraintFunc(uintx value, bool verbose) {
206 if (CodeCacheSegmentSize < (uintx)CodeEntryAlignment) {
207 JVMFlag::printError(verbose,
208 "CodeCacheSegmentSize (" UINTX_FORMAT ") must be "
209 "larger than or equal to CodeEntryAlignment (" INTX_FORMAT ") "
210 "to align entry points\n",
211 CodeCacheSegmentSize, CodeEntryAlignment);
212 return JVMFlag::VIOLATES_CONSTRAINT;
213 }
214
215 if (CodeCacheSegmentSize < sizeof(jdouble)) {
216 JVMFlag::printError(verbose,
217 "CodeCacheSegmentSize (" UINTX_FORMAT ") must be "
218 "at least " SIZE_FORMAT " to align constants\n",
219 CodeCacheSegmentSize, sizeof(jdouble));
220 return JVMFlag::VIOLATES_CONSTRAINT;
221 }
222
223 #ifdef COMPILER2
224 if (CodeCacheSegmentSize < (uintx)OptoLoopAlignment) {
225 JVMFlag::printError(verbose,
226 "CodeCacheSegmentSize (" UINTX_FORMAT ") must be "
227 "larger than or equal to OptoLoopAlignment (" INTX_FORMAT ") "
228 "to align inner loops\n",
229 CodeCacheSegmentSize, OptoLoopAlignment);
230 return JVMFlag::VIOLATES_CONSTRAINT;
231 }
232 #endif
233
234 return JVMFlag::SUCCESS;
235 }
236
237 JVMFlag::Error CodeEntryAlignmentConstraintFunc(intx value, bool verbose) {
238 if (!is_power_of_2(value)) {
239 JVMFlag::printError(verbose,
240 "CodeEntryAlignment (" INTX_FORMAT ") must be "
241 "a power of two\n", CodeEntryAlignment);
242 return JVMFlag::VIOLATES_CONSTRAINT;
243 }
244
245 if (CodeEntryAlignment < 16) {
246 JVMFlag::printError(verbose,
247 "CodeEntryAlignment (" INTX_FORMAT ") must be "
248 "greater than or equal to %d\n",
249 CodeEntryAlignment, 16);
250 return JVMFlag::VIOLATES_CONSTRAINT;
251 }
252
253 return JVMFlag::SUCCESS;
254 }
255
256 JVMFlag::Error OptoLoopAlignmentConstraintFunc(intx value, bool verbose) {
257 if (!is_power_of_2(value)) {
258 JVMFlag::printError(verbose,
259 "OptoLoopAlignment (" INTX_FORMAT ") "
260 "must be a power of two\n",
261 value);
262 return JVMFlag::VIOLATES_CONSTRAINT;
263 }
264
265 // Relevant on ppc, s390. Will be optimized where
266 // addr_unit() == 1.
267 if (OptoLoopAlignment % relocInfo::addr_unit() != 0) {
268 JVMFlag::printError(verbose,
269 "OptoLoopAlignment (" INTX_FORMAT ") must be "
270 "multiple of NOP size (%d)\n",
271 value, relocInfo::addr_unit());
272 return JVMFlag::VIOLATES_CONSTRAINT;
273 }
274
275 return JVMFlag::SUCCESS;
276 }
277
278 JVMFlag::Error ArraycopyDstPrefetchDistanceConstraintFunc(uintx value, bool verbose) {
279 if (value >= 4032) {
280 JVMFlag::printError(verbose,
281 "ArraycopyDstPrefetchDistance (" UINTX_FORMAT ") must be"
282 "between 0 and 4031\n", value);
283 return JVMFlag::VIOLATES_CONSTRAINT;
284 }
285
286 return JVMFlag::SUCCESS;
287 }
288
289 JVMFlag::Error ArraycopySrcPrefetchDistanceConstraintFunc(uintx value, bool verbose) {
290 if (value >= 4032) {
291 JVMFlag::printError(verbose,
292 "ArraycopySrcPrefetchDistance (" UINTX_FORMAT ") must be"
293 "between 0 and 4031\n", value);
294 return JVMFlag::VIOLATES_CONSTRAINT;
295 }
296
297 return JVMFlag::SUCCESS;
298 }
299
300 JVMFlag::Error TypeProfileLevelConstraintFunc(uintx value, bool verbose) {
301 for (int i = 0; i < 3; i++) {
302 if (value % 10 > 2) {
303 JVMFlag::printError(verbose,
304 "Invalid value (" UINTX_FORMAT ") "
305 "in TypeProfileLevel at position %d\n", value, i);
306 return JVMFlag::VIOLATES_CONSTRAINT;
307 }
308 value = value / 10;
309 }
310
311 return JVMFlag::SUCCESS;
312 }
313
314 JVMFlag::Error InitArrayShortSizeConstraintFunc(intx value, bool verbose) {
315 if (value % BytesPerLong != 0) {
316 return JVMFlag::VIOLATES_CONSTRAINT;
317 } else {
318 return JVMFlag::SUCCESS;
319 }
320 }
321
322 #ifdef COMPILER2
323 JVMFlag::Error InteriorEntryAlignmentConstraintFunc(intx value, bool verbose) {
324 if (InteriorEntryAlignment > CodeEntryAlignment) {
325 JVMFlag::printError(verbose,
326 "InteriorEntryAlignment (" INTX_FORMAT ") must be "
327 "less than or equal to CodeEntryAlignment (" INTX_FORMAT ")\n",
328 InteriorEntryAlignment, CodeEntryAlignment);
329 return JVMFlag::VIOLATES_CONSTRAINT;
330 }
331
332 if (!is_power_of_2(value)) {
333 JVMFlag::printError(verbose,
334 "InteriorEntryAlignment (" INTX_FORMAT ") must be "
335 "a power of two\n", InteriorEntryAlignment);
336 return JVMFlag::VIOLATES_CONSTRAINT;
337 }
338
339 int minimum_alignment = 16;
340 #if defined(X86) && !defined(AMD64)
341 minimum_alignment = 4;
342 #elif defined(S390)
343 minimum_alignment = 2;
344 #endif
345
346 if (InteriorEntryAlignment < minimum_alignment) {
347 JVMFlag::printError(verbose,
348 "InteriorEntryAlignment (" INTX_FORMAT ") must be "
349 "greater than or equal to %d\n",
350 InteriorEntryAlignment, minimum_alignment);
351 return JVMFlag::VIOLATES_CONSTRAINT;
352 }
353
354 return JVMFlag::SUCCESS;
355 }
356
357 JVMFlag::Error NodeLimitFudgeFactorConstraintFunc(intx value, bool verbose) {
358 if (value < MaxNodeLimit * 2 / 100 || value > MaxNodeLimit * 40 / 100) {
359 JVMFlag::printError(verbose,
360 "NodeLimitFudgeFactor must be between 2%% and 40%% "
361 "of MaxNodeLimit (" INTX_FORMAT ")\n",
362 MaxNodeLimit);
363 return JVMFlag::VIOLATES_CONSTRAINT;
364 }
365
366 return JVMFlag::SUCCESS;
367 }
368 #endif // COMPILER2
369
370 JVMFlag::Error RTMTotalCountIncrRateConstraintFunc(int value, bool verbose) {
371 #if INCLUDE_RTM_OPT
372 if (UseRTMLocking && !is_power_of_2(RTMTotalCountIncrRate)) {
373 JVMFlag::printError(verbose,
374 "RTMTotalCountIncrRate (%d) must be "
375 "a power of 2, resetting it to 64\n",
376 RTMTotalCountIncrRate);
377 FLAG_SET_DEFAULT(RTMTotalCountIncrRate, 64);
378 }
379 #endif
380
381 return JVMFlag::SUCCESS;
382 }
383
384 JVMFlag::Error DisableIntrinsicConstraintFunc(ccstrlist value, bool verbose) {
385 ControlIntrinsicValidator validator(value, true/*disabled_all*/);
386 if (!validator.is_valid()) {
387 JVMFlag::printError(verbose,
388 "An unrecognized intrinsic is detected in DisableIntrinsic: %s\n",
389 validator.what());
390 return JVMFlag::VIOLATES_CONSTRAINT;
391 }
392
393 return JVMFlag::SUCCESS;
394 }
395
396 JVMFlag::Error ControlIntrinsicConstraintFunc(ccstrlist value, bool verbose) {
397 ControlIntrinsicValidator validator(value, false/*disabled_all*/);
398 if (!validator.is_valid()) {
399 JVMFlag::printError(verbose,
400 "An unrecognized intrinsic is detected in ControlIntrinsic: %s\n",
401 validator.what());
402 return JVMFlag::VIOLATES_CONSTRAINT;
403 }
404
405 return JVMFlag::SUCCESS;
406 }