1 /*
2 * Copyright (c) 2015, 2018, 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 "oops/metadata.hpp"
29 #include "runtime/os.hpp"
30 #include "interpreter/invocationCounter.hpp"
31 #include "runtime/arguments.hpp"
32 #include "runtime/flags/jvmFlag.hpp"
33 #include "runtime/flags/jvmFlagConstraintsCompiler.hpp"
34 #include "runtime/globals.hpp"
35 #include "runtime/globals_extension.hpp"
36 #include "utilities/powerOfTwo.hpp"
37
38 JVMFlag::Error AliasLevelConstraintFunc(intx value, bool verbose) {
39 if ((value <= 1) && (Arguments::mode() == Arguments::_comp || Arguments::mode() == Arguments::_mixed)) {
40 JVMFlag::printError(verbose,
41 "AliasLevel (" INTX_FORMAT ") is not "
42 "compatible with -Xcomp or -Xmixed\n",
43 value);
44 return JVMFlag::VIOLATES_CONSTRAINT;
45 } else {
46 return JVMFlag::SUCCESS;
47 }
48 }
49
50 /**
51 * Validate the minimum number of compiler threads needed to run the
52 * JVM. The following configurations are possible.
53 *
54 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
55 * compiler threads is 0.
56 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
57 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
58 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
59 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
60 * C1 can be used, so the minimum number of compiler threads is 1.
61 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
62 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
63 * the minimum number of compiler threads is 2.
64 * 5) Non-tiered emulation mode is on. CompilationModeFlag::disable_intermediate() == true.
65 * The minimum number of threads is 2. But if CompilationModeFlag::quick_internal() == false, then it's 1.
66 */
67 JVMFlag::Error CICompilerCountConstraintFunc(intx value, bool verbose) {
68 int min_number_of_compiler_threads = 0;
69 #if !defined(COMPILER1) && !defined(COMPILER2) && !INCLUDE_JVMCI
70 // case 1
71 #elif defined(TIERED)
72 if (TieredCompilation) {
73 if (TieredStopAtLevel < CompLevel_full_optimization || CompilationModeFlag::quick_only()) {
74 min_number_of_compiler_threads = 1; // case 3
75 } else if (CompilationModeFlag::disable_intermediate()) {
76 // case 5
77 if (CompilationModeFlag::quick_internal()) {
78 min_number_of_compiler_threads = 2;
79 } else {
80 min_number_of_compiler_threads = 1;
81 }
82 } else {
83 min_number_of_compiler_threads = 2; // case 4 (tiered)
84 }
85 } else {
86 min_number_of_compiler_threads = 1; // case 2
87 }
88 #else
89 min_number_of_compiler_threads = 1; // case 2
90 #endif
91
92 // The default CICompilerCount's value is CI_COMPILER_COUNT.
93 // With a client VM, -XX:+TieredCompilation causes TieredCompilation
94 // to be true here (the option is validated later) and
95 // min_number_of_compiler_threads to exceed CI_COMPILER_COUNT.
96 min_number_of_compiler_threads = MIN2(min_number_of_compiler_threads, CI_COMPILER_COUNT);
97
98 if (value < (intx)min_number_of_compiler_threads) {
99 JVMFlag::printError(verbose,
100 "CICompilerCount (" INTX_FORMAT ") must be "
101 "at least %d \n",
102 value, min_number_of_compiler_threads);
103 return JVMFlag::VIOLATES_CONSTRAINT;
104 } else {
105 return JVMFlag::SUCCESS;
106 }
107 }
108
109 JVMFlag::Error AllocatePrefetchDistanceConstraintFunc(intx value, bool verbose) {
110 if (value < 0 || value > 512) {
111 JVMFlag::printError(verbose,
112 "AllocatePrefetchDistance (" INTX_FORMAT ") must be "
113 "between 0 and %d\n",
114 AllocatePrefetchDistance, 512);
115 return JVMFlag::VIOLATES_CONSTRAINT;
116 }
117
118 return JVMFlag::SUCCESS;
119 }
120
121 JVMFlag::Error AllocatePrefetchStepSizeConstraintFunc(intx value, bool verbose) {
122 if (AllocatePrefetchStyle == 3) {
123 if (value % wordSize != 0) {
124 JVMFlag::printError(verbose,
125 "AllocatePrefetchStepSize (" INTX_FORMAT ") must be multiple of %d\n",
126 value, wordSize);
127 return JVMFlag::VIOLATES_CONSTRAINT;
128 }
129 }
130 return JVMFlag::SUCCESS;
131 }
132
133 JVMFlag::Error AllocatePrefetchInstrConstraintFunc(intx value, bool verbose) {
134 intx max_value = max_intx;
135 #if defined(X86)
136 max_value = 3;
137 #endif
138 if (value < 0 || value > max_value) {
139 JVMFlag::printError(verbose,
140 "AllocatePrefetchInstr (" INTX_FORMAT ") must be "
141 "between 0 and " INTX_FORMAT "\n", value, max_value);
142 return JVMFlag::VIOLATES_CONSTRAINT;
143 }
144
145 return JVMFlag::SUCCESS;
146 }
147
148 JVMFlag::Error CompileThresholdConstraintFunc(intx value, bool verbose) {
149 if (value < 0 || value > INT_MAX >> InvocationCounter::count_shift) {
150 JVMFlag::printError(verbose,
151 "CompileThreshold (" INTX_FORMAT ") "
152 "must be between 0 and %d\n",
153 value,
154 INT_MAX >> InvocationCounter::count_shift);
155 return JVMFlag::VIOLATES_CONSTRAINT;
156 }
157
158 return JVMFlag::SUCCESS;
159 }
160
161 JVMFlag::Error OnStackReplacePercentageConstraintFunc(intx value, bool verbose) {
162 int64_t max_percentage_limit = INT_MAX;
163 if (!ProfileInterpreter) {
164 max_percentage_limit = (max_percentage_limit>>InvocationCounter::count_shift);
165 }
166 max_percentage_limit = CompileThreshold == 0 ? max_percentage_limit*100 : max_percentage_limit*100/CompileThreshold;
167
168 if (ProfileInterpreter) {
169 if (value < InterpreterProfilePercentage) {
170 JVMFlag::printError(verbose,
171 "OnStackReplacePercentage (" INTX_FORMAT ") must be "
172 "larger than InterpreterProfilePercentage (" INTX_FORMAT ")\n",
173 value, InterpreterProfilePercentage);
174 return JVMFlag::VIOLATES_CONSTRAINT;
175 }
176
177 max_percentage_limit += InterpreterProfilePercentage;
178 if (value > max_percentage_limit) {
179 JVMFlag::printError(verbose,
180 "OnStackReplacePercentage (" INTX_FORMAT ") must be between 0 and " INT64_FORMAT "\n",
181 value,
182 max_percentage_limit);
183 return JVMFlag::VIOLATES_CONSTRAINT;
184 }
185 } else {
186 if (value < 0) {
187 JVMFlag::printError(verbose,
188 "OnStackReplacePercentage (" INTX_FORMAT ") must be "
189 "non-negative\n", value);
190 return JVMFlag::VIOLATES_CONSTRAINT;
191 }
192
193 if (value > max_percentage_limit) {
194 JVMFlag::printError(verbose,
195 "OnStackReplacePercentage (" INTX_FORMAT ") must be between 0 and " INT64_FORMAT "\n",
196 value,
197 max_percentage_limit);
198 return JVMFlag::VIOLATES_CONSTRAINT;
199 }
200 }
201 return JVMFlag::SUCCESS;
202 }
203
204 JVMFlag::Error CodeCacheSegmentSizeConstraintFunc(uintx value, bool verbose) {
205 if (CodeCacheSegmentSize < (uintx)CodeEntryAlignment) {
206 JVMFlag::printError(verbose,
207 "CodeCacheSegmentSize (" UINTX_FORMAT ") must be "
208 "larger than or equal to CodeEntryAlignment (" INTX_FORMAT ") "
209 "to align entry points\n",
210 CodeCacheSegmentSize, CodeEntryAlignment);
211 return JVMFlag::VIOLATES_CONSTRAINT;
212 }
213
214 if (CodeCacheSegmentSize < sizeof(jdouble)) {
215 JVMFlag::printError(verbose,
216 "CodeCacheSegmentSize (" UINTX_FORMAT ") must be "
217 "at least " SIZE_FORMAT " to align constants\n",
218 CodeCacheSegmentSize, sizeof(jdouble));
219 return JVMFlag::VIOLATES_CONSTRAINT;
220 }
221
222 #ifdef COMPILER2
223 if (CodeCacheSegmentSize < (uintx)OptoLoopAlignment) {
224 JVMFlag::printError(verbose,
225 "CodeCacheSegmentSize (" UINTX_FORMAT ") must be "
226 "larger than or equal to OptoLoopAlignment (" INTX_FORMAT ") "
227 "to align inner loops\n",
228 CodeCacheSegmentSize, OptoLoopAlignment);
229 return JVMFlag::VIOLATES_CONSTRAINT;
230 }
231 #endif
232
233 return JVMFlag::SUCCESS;
234 }
235
236 JVMFlag::Error CompilerThreadPriorityConstraintFunc(intx value, bool verbose) {
237 return JVMFlag::SUCCESS;
238 }
239
240 JVMFlag::Error CodeEntryAlignmentConstraintFunc(intx value, bool verbose) {
241 if (!is_power_of_2(value)) {
242 JVMFlag::printError(verbose,
243 "CodeEntryAlignment (" INTX_FORMAT ") must be "
244 "a power of two\n", CodeEntryAlignment);
245 return JVMFlag::VIOLATES_CONSTRAINT;
246 }
247
248 if (CodeEntryAlignment < 16) {
249 JVMFlag::printError(verbose,
250 "CodeEntryAlignment (" INTX_FORMAT ") must be "
251 "greater than or equal to %d\n",
252 CodeEntryAlignment, 16);
253 return JVMFlag::VIOLATES_CONSTRAINT;
254 }
255
256 return JVMFlag::SUCCESS;
257 }
258
259 JVMFlag::Error OptoLoopAlignmentConstraintFunc(intx value, bool verbose) {
260 if (!is_power_of_2(value)) {
261 JVMFlag::printError(verbose,
262 "OptoLoopAlignment (" INTX_FORMAT ") "
263 "must be a power of two\n",
264 value);
265 return JVMFlag::VIOLATES_CONSTRAINT;
266 }
267
268 // Relevant on ppc, s390. Will be optimized where
269 // addr_unit() == 1.
270 if (OptoLoopAlignment % relocInfo::addr_unit() != 0) {
271 JVMFlag::printError(verbose,
272 "OptoLoopAlignment (" INTX_FORMAT ") must be "
273 "multiple of NOP size (%d)\n",
274 value, relocInfo::addr_unit());
275 return JVMFlag::VIOLATES_CONSTRAINT;
276 }
277
278 return JVMFlag::SUCCESS;
279 }
280
281 JVMFlag::Error ArraycopyDstPrefetchDistanceConstraintFunc(uintx value, bool verbose) {
282 if (value >= 4032) {
283 JVMFlag::printError(verbose,
284 "ArraycopyDstPrefetchDistance (" UINTX_FORMAT ") must be"
285 "between 0 and 4031\n", value);
286 return JVMFlag::VIOLATES_CONSTRAINT;
287 }
288
289 return JVMFlag::SUCCESS;
290 }
291
292 JVMFlag::Error ArraycopySrcPrefetchDistanceConstraintFunc(uintx value, bool verbose) {
293 if (value >= 4032) {
294 JVMFlag::printError(verbose,
295 "ArraycopySrcPrefetchDistance (" UINTX_FORMAT ") must be"
296 "between 0 and 4031\n", value);
297 return JVMFlag::VIOLATES_CONSTRAINT;
298 }
299
300 return JVMFlag::SUCCESS;
301 }
302
303 JVMFlag::Error TypeProfileLevelConstraintFunc(uintx value, bool verbose) {
304 for (int i = 0; i < 3; i++) {
305 if (value % 10 > 2) {
306 JVMFlag::printError(verbose,
307 "Invalid value (" UINTX_FORMAT ") "
308 "in TypeProfileLevel at position %d\n", value, i);
309 return JVMFlag::VIOLATES_CONSTRAINT;
310 }
311 value = value / 10;
312 }
313
314 return JVMFlag::SUCCESS;
315 }
316
317 JVMFlag::Error InitArrayShortSizeConstraintFunc(intx value, bool verbose) {
318 if (value % BytesPerLong != 0) {
319 return JVMFlag::VIOLATES_CONSTRAINT;
320 } else {
321 return JVMFlag::SUCCESS;
322 }
323 }
324
325 #ifdef COMPILER2
326 JVMFlag::Error InteriorEntryAlignmentConstraintFunc(intx value, bool verbose) {
327 if (InteriorEntryAlignment > CodeEntryAlignment) {
328 JVMFlag::printError(verbose,
329 "InteriorEntryAlignment (" INTX_FORMAT ") must be "
330 "less than or equal to CodeEntryAlignment (" INTX_FORMAT ")\n",
331 InteriorEntryAlignment, CodeEntryAlignment);
332 return JVMFlag::VIOLATES_CONSTRAINT;
333 }
334
335 if (!is_power_of_2(value)) {
336 JVMFlag::printError(verbose,
337 "InteriorEntryAlignment (" INTX_FORMAT ") must be "
338 "a power of two\n", InteriorEntryAlignment);
339 return JVMFlag::VIOLATES_CONSTRAINT;
340 }
341
342 int minimum_alignment = 16;
343 #if defined(X86) && !defined(AMD64)
344 minimum_alignment = 4;
345 #elif defined(S390)
346 minimum_alignment = 2;
347 #endif
348
349 if (InteriorEntryAlignment < minimum_alignment) {
350 JVMFlag::printError(verbose,
351 "InteriorEntryAlignment (" INTX_FORMAT ") must be "
352 "greater than or equal to %d\n",
353 InteriorEntryAlignment, minimum_alignment);
354 return JVMFlag::VIOLATES_CONSTRAINT;
355 }
356
357 return JVMFlag::SUCCESS;
358 }
359
360 JVMFlag::Error NodeLimitFudgeFactorConstraintFunc(intx value, bool verbose) {
361 if (value < MaxNodeLimit * 2 / 100 || value > MaxNodeLimit * 40 / 100) {
362 JVMFlag::printError(verbose,
363 "NodeLimitFudgeFactor must be between 2%% and 40%% "
364 "of MaxNodeLimit (" INTX_FORMAT ")\n",
365 MaxNodeLimit);
366 return JVMFlag::VIOLATES_CONSTRAINT;
367 }
368
369 return JVMFlag::SUCCESS;
370 }
371 #endif // COMPILER2
372
373 JVMFlag::Error RTMTotalCountIncrRateConstraintFunc(int value, bool verbose) {
374 #if INCLUDE_RTM_OPT
375 if (UseRTMLocking && !is_power_of_2(RTMTotalCountIncrRate)) {
376 JVMFlag::printError(verbose,
377 "RTMTotalCountIncrRate (%d) must be "
378 "a power of 2, resetting it to 64\n",
379 RTMTotalCountIncrRate);
380 FLAG_SET_DEFAULT(RTMTotalCountIncrRate, 64);
381 }
382 #endif
383
384 return JVMFlag::SUCCESS;
385 }