1 /*
2 * Copyright (c) 2016, 2019, 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/codeCache.hpp"
27 #include "runtime/globals.hpp"
28 #include "runtime/globals_extension.hpp"
29 #include "compiler/compilerDefinitions.hpp"
30 #include "gc/shared/gcConfig.hpp"
31 #include "utilities/defaultStream.hpp"
32
33 const char* compilertype2name_tab[compiler_number_of_types] = {
34 "",
35 "c1",
36 "c2",
37 "jvmci"
38 };
39
40 #if defined(COMPILER2)
41 CompLevel CompLevel_highest_tier = CompLevel_full_optimization; // pure C2 and tiered or JVMCI and tiered
42 #elif defined(COMPILER1)
43 CompLevel CompLevel_highest_tier = CompLevel_simple; // pure C1 or JVMCI
44 #else
45 CompLevel CompLevel_highest_tier = CompLevel_none;
46 #endif
47
48 #if defined(TIERED)
49 CompLevel CompLevel_initial_compile = CompLevel_full_profile; // tiered
50 #elif defined(COMPILER1) || INCLUDE_JVMCI
51 CompLevel CompLevel_initial_compile = CompLevel_simple; // pure C1 or JVMCI
52 #elif defined(COMPILER2)
53 CompLevel CompLevel_initial_compile = CompLevel_full_optimization; // pure C2
54 #else
55 CompLevel CompLevel_initial_compile = CompLevel_none;
56 #endif
57
58 #if defined(COMPILER2)
59 CompMode Compilation_mode = CompMode_server;
60 #elif defined(COMPILER1)
61 CompMode Compilation_mode = CompMode_client;
62 #else
63 CompMode Compilation_mode = CompMode_none;
64 #endif
65
66 // Returns threshold scaled with CompileThresholdScaling
67 intx CompilerConfig::scaled_compile_threshold(intx threshold) {
68 return scaled_compile_threshold(threshold, CompileThresholdScaling);
69 }
70
71 // Returns freq_log scaled with CompileThresholdScaling
72 intx CompilerConfig::scaled_freq_log(intx freq_log) {
73 return scaled_freq_log(freq_log, CompileThresholdScaling);
74 }
75
76 // Returns threshold scaled with the value of scale.
77 // If scale < 0.0, threshold is returned without scaling.
78 intx CompilerConfig::scaled_compile_threshold(intx threshold, double scale) {
79 if (scale == 1.0 || scale < 0.0) {
80 return threshold;
81 } else {
82 return (intx)(threshold * scale);
83 }
84 }
85
86 // Returns freq_log scaled with the value of scale.
87 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
88 // If scale < 0.0, freq_log is returned without scaling.
89 intx CompilerConfig::scaled_freq_log(intx freq_log, double scale) {
90 // Check if scaling is necessary or if negative value was specified.
91 if (scale == 1.0 || scale < 0.0) {
92 return freq_log;
93 }
94 // Check values to avoid calculating log2 of 0.
95 if (scale == 0.0 || freq_log == 0) {
96 return 0;
97 }
98 // Determine the maximum notification frequency value currently supported.
99 // The largest mask value that the interpreter/C1 can handle is
100 // of length InvocationCounter::number_of_count_bits. Mask values are always
101 // one bit shorter then the value of the notification frequency. Set
102 // max_freq_bits accordingly.
103 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
104 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
105 if (scaled_freq == 0) {
106 // Return 0 right away to avoid calculating log2 of 0.
107 return 0;
108 } else if (scaled_freq > nth_bit(max_freq_bits)) {
109 return max_freq_bits;
110 } else {
111 return log2_intptr(scaled_freq);
112 }
113 }
114
115 #ifdef TIERED
116 void set_client_compilation_mode() {
117 Compilation_mode = CompMode_client;
118 CompLevel_highest_tier = CompLevel_simple;
119 CompLevel_initial_compile = CompLevel_simple;
120 FLAG_SET_ERGO(bool, TieredCompilation, false);
121 FLAG_SET_ERGO(bool, ProfileInterpreter, false);
122 #if INCLUDE_JVMCI
123 FLAG_SET_ERGO(bool, EnableJVMCI, false);
124 FLAG_SET_ERGO(bool, UseJVMCICompiler, false);
125 #endif
126 #if INCLUDE_AOT
127 FLAG_SET_ERGO(bool, UseAOT, false);
128 #endif
129 if (FLAG_IS_DEFAULT(NeverActAsServerClassMachine)) {
130 FLAG_SET_ERGO(bool, NeverActAsServerClassMachine, true);
131 }
132 if (FLAG_IS_DEFAULT(InitialCodeCacheSize)) {
133 FLAG_SET_ERGO(uintx, InitialCodeCacheSize, 160*K);
134 }
135 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
136 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, 32*M);
137 }
138 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) {
139 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, 27*M);
140 }
141 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) {
142 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, 0);
143 }
144 if (FLAG_IS_DEFAULT(NonNMethodCodeHeapSize)) {
145 FLAG_SET_ERGO(uintx, NonNMethodCodeHeapSize, 5*M);
146 }
147 if (FLAG_IS_DEFAULT(CodeCacheExpansionSize)) {
148 FLAG_SET_ERGO(uintx, CodeCacheExpansionSize, 32*K);
149 }
150 if (FLAG_IS_DEFAULT(MetaspaceSize)) {
151 FLAG_SET_ERGO(size_t, MetaspaceSize, MIN2(12*M, MaxMetaspaceSize));
152 }
153 if (FLAG_IS_DEFAULT(MaxRAM)) {
154 // Do not use FLAG_SET_ERGO to update MaxRAM, as this will impact
155 // heap setting done based on available phys_mem (see Arguments::set_heap_size).
156 FLAG_SET_DEFAULT(MaxRAM, 1ULL*G);
157 }
158 if (FLAG_IS_DEFAULT(CompileThreshold)) {
159 FLAG_SET_ERGO(intx, CompileThreshold, 1500);
160 }
161 if (FLAG_IS_DEFAULT(OnStackReplacePercentage)) {
162 FLAG_SET_ERGO(intx, OnStackReplacePercentage, 933);
163 }
164 if (FLAG_IS_DEFAULT(CICompilerCount)) {
165 FLAG_SET_ERGO(intx, CICompilerCount, 1);
166 }
167 }
168
169 bool compilation_mode_selected() {
170 return !FLAG_IS_DEFAULT(TieredCompilation) ||
171 !FLAG_IS_DEFAULT(TieredStopAtLevel) ||
172 !FLAG_IS_DEFAULT(UseAOT)
173 JVMCI_ONLY(|| !FLAG_IS_DEFAULT(EnableJVMCI)
174 || !FLAG_IS_DEFAULT(UseJVMCICompiler));
175 }
176
177 void select_compilation_mode_ergonomically() {
178 #if defined(_WINDOWS) && !defined(_LP64)
179 if (FLAG_IS_DEFAULT(NeverActAsServerClassMachine)) {
180 FLAG_SET_ERGO(bool, NeverActAsServerClassMachine, true);
181 }
182 #endif
183 if (NeverActAsServerClassMachine) {
184 set_client_compilation_mode();
185 }
186 }
187
188 #endif // TIERED
189
190 void CompilerConfig::set_tiered_flags() {
191 // With tiered, set default policy to SimpleThresholdPolicy, which is 2.
192 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
193 FLAG_SET_DEFAULT(CompilationPolicyChoice, 2);
194 }
195 if (CompilationPolicyChoice < 2) {
196 vm_exit_during_initialization(
197 "Incompatible compilation policy selected", NULL);
198 }
199 // Increase the code cache size - tiered compiles a lot more.
200 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
201 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
202 MIN2(CODE_CACHE_DEFAULT_LIMIT, (size_t)ReservedCodeCacheSize * 5));
203 }
204 // Enable SegmentedCodeCache if TieredCompilation is enabled, ReservedCodeCacheSize >= 240M
205 // and the code cache contains at least 8 pages (segmentation disables advantage of huge pages).
206 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M &&
207 8 * CodeCache::page_size() <= ReservedCodeCacheSize) {
208 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
209 }
210 if (!UseInterpreter) { // -Xcomp
211 Tier3InvokeNotifyFreqLog = 0;
212 Tier4InvocationThreshold = 0;
213 }
214
215 if (CompileThresholdScaling < 0) {
216 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
217 }
218
219 // Scale tiered compilation thresholds.
220 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
221 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
222 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
223 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
224
225 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
226 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
227 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
228 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
229
230 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
231 // once these thresholds become supported.
232
233 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
234 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
235
236 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
237 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
238
239 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
240
241 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
242 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
243 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
244 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
245 }
246 }
247
248 #if INCLUDE_JVMCI
249 void set_jvmci_specific_flags() {
250 if (UseJVMCICompiler) {
251 Compilation_mode = CompMode_server;
252
253 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
254 FLAG_SET_DEFAULT(TypeProfileWidth, 8);
255 }
256 if (FLAG_IS_DEFAULT(OnStackReplacePercentage)) {
257 FLAG_SET_DEFAULT(OnStackReplacePercentage, 933);
258 }
259 // JVMCI needs values not less than defaults
260 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
261 FLAG_SET_DEFAULT(ReservedCodeCacheSize, MAX2(64*M, ReservedCodeCacheSize));
262 }
263 if (FLAG_IS_DEFAULT(InitialCodeCacheSize)) {
264 FLAG_SET_DEFAULT(InitialCodeCacheSize, MAX2(16*M, InitialCodeCacheSize));
265 }
266 if (FLAG_IS_DEFAULT(MetaspaceSize)) {
267 FLAG_SET_DEFAULT(MetaspaceSize, MIN2(MAX2(12*M, MetaspaceSize), MaxMetaspaceSize));
268 }
269 if (FLAG_IS_DEFAULT(NewSizeThreadIncrease)) {
270 FLAG_SET_DEFAULT(NewSizeThreadIncrease, MAX2(4*K, NewSizeThreadIncrease));
271 }
272 if (TieredStopAtLevel != CompLevel_full_optimization) {
273 // Currently JVMCI compiler can only work at the full optimization level
274 warning("forcing TieredStopAtLevel to full optimization because JVMCI is enabled");
275 FLAG_SET_ERGO(intx, TieredStopAtLevel, CompLevel_full_optimization);
276 }
277 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
278 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
279 }
280 }
281 }
282 #endif // INCLUDE_JVMCI
283
284 bool CompilerConfig::check_args_consistency(bool status) {
285 // Check lower bounds of the code cache
286 // Template Interpreter code is approximately 3X larger in debug builds.
287 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
288 if (ReservedCodeCacheSize < InitialCodeCacheSize) {
289 jio_fprintf(defaultStream::error_stream(),
290 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
291 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
292 status = false;
293 } else if (ReservedCodeCacheSize < min_code_cache_size) {
294 jio_fprintf(defaultStream::error_stream(),
295 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
296 min_code_cache_size/K);
297 status = false;
298 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
299 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
300 jio_fprintf(defaultStream::error_stream(),
301 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
302 CODE_CACHE_SIZE_LIMIT/M);
303 status = false;
304 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
305 jio_fprintf(defaultStream::error_stream(),
306 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
307 min_code_cache_size/K);
308 status = false;
309 }
310
311 #ifdef _LP64
312 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
313 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
314 }
315 #endif
316
317 if (BackgroundCompilation && ReplayCompiles) {
318 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
319 warning("BackgroundCompilation disabled due to ReplayCompiles option.");
320 }
321 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
322 }
323
324 #ifdef COMPILER2
325 if (PostLoopMultiversioning && !RangeCheckElimination) {
326 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) {
327 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled.");
328 }
329 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false);
330 }
331 if (UseCountedLoopSafepoints && LoopStripMiningIter == 0) {
332 if (!FLAG_IS_DEFAULT(UseCountedLoopSafepoints) || !FLAG_IS_DEFAULT(LoopStripMiningIter)) {
333 warning("When counted loop safepoints are enabled, LoopStripMiningIter must be at least 1 (a safepoint every 1 iteration): setting it to 1");
334 }
335 LoopStripMiningIter = 1;
336 } else if (!UseCountedLoopSafepoints && LoopStripMiningIter > 0) {
337 if (!FLAG_IS_DEFAULT(UseCountedLoopSafepoints) || !FLAG_IS_DEFAULT(LoopStripMiningIter)) {
338 warning("Disabling counted safepoints implies no loop strip mining: setting LoopStripMiningIter to 0");
339 }
340 LoopStripMiningIter = 0;
341 }
342 #endif // COMPILER2
343
344 if (Arguments::is_interpreter_only()) {
345 if (UseCompiler) {
346 if (!FLAG_IS_DEFAULT(UseCompiler)) {
347 warning("UseCompiler disabled due to -Xint.");
348 }
349 FLAG_SET_CMDLINE(bool, UseCompiler, false);
350 }
351 if (ProfileInterpreter) {
352 if (!FLAG_IS_DEFAULT(ProfileInterpreter)) {
353 warning("ProfileInterpreter disabled due to -Xint.");
354 }
355 FLAG_SET_CMDLINE(bool, ProfileInterpreter, false);
356 }
357 if (TieredCompilation) {
358 if (!FLAG_IS_DEFAULT(TieredCompilation)) {
359 warning("TieredCompilation disabled due to -Xint.");
360 }
361 FLAG_SET_CMDLINE(bool, TieredCompilation, false);
362 }
363 #if INCLUDE_JVMCI
364 if (EnableJVMCI) {
365 if (!FLAG_IS_DEFAULT(EnableJVMCI) || !FLAG_IS_DEFAULT(UseJVMCICompiler)) {
366 warning("JVMCI Compiler disabled due to -Xint.");
367 }
368 FLAG_SET_CMDLINE(bool, EnableJVMCI, false);
369 FLAG_SET_CMDLINE(bool, UseJVMCICompiler, false);
370 }
371 #endif
372 } else {
373 #if INCLUDE_JVMCI
374 status = status && JVMCIGlobals::check_jvmci_flags_are_consistent();
375 #endif
376 }
377
378 #if INCLUDE_JVMCI && defined(AARCH64)
379 if (Use64BitLiteralAddresses && EnableJVMCI) {
380 warning("64-bit Literal Addresses disabled due to EnableJVMCI.");
381 FLAG_SET_CMDLINE(bool, Use64BitLiteralAddresses, false);
382 }
383 #endif
384
385 return status;
386 }
387
388 void CompilerConfig::ergo_initialize() {
389 if (Arguments::is_interpreter_only()) {
390 return; // Nothing to do.
391 }
392
393 #ifdef TIERED
394 if (!compilation_mode_selected()) {
395 select_compilation_mode_ergonomically();
396 }
397 #endif
398
399 #if INCLUDE_JVMCI
400 // Check that JVMCI compiler supports selested GC.
401 // Should be done after GCConfig::initialize() was called.
402 JVMCIGlobals::check_jvmci_supported_gc();
403 set_jvmci_specific_flags();
404 #endif
405
406 if (TieredCompilation) {
407 set_tiered_flags();
408 } else {
409 int max_compilation_policy_choice = 1;
410 #ifdef COMPILER2
411 if (is_server_compilation_mode_vm()) {
412 max_compilation_policy_choice = 2;
413 }
414 #endif
415 // Check if the policy is valid.
416 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
417 vm_exit_during_initialization(
418 "Incompatible compilation policy selected", NULL);
419 }
420 // Scale CompileThreshold
421 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
422 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
423 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
424 }
425 }
426
427 if (UseOnStackReplacement && !UseLoopCounter) {
428 warning("On-stack-replacement requires loop counters; enabling loop counters");
429 FLAG_SET_DEFAULT(UseLoopCounter, true);
430 }
431
432 #ifdef COMPILER2
433 if (!EliminateLocks) {
434 EliminateNestedLocks = false;
435 }
436 if (!Inline) {
437 IncrementalInline = false;
438 }
439 #ifndef PRODUCT
440 if (!IncrementalInline) {
441 AlwaysIncrementalInline = false;
442 }
443 if (PrintIdealGraphLevel > 0) {
444 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
445 }
446 #endif
447 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
448 // nothing to use the profiling, turn if off
449 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
450 }
451 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
452 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
453 }
454 if (FLAG_IS_DEFAULT(LoopStripMiningIterShortLoop)) {
455 // blind guess
456 LoopStripMiningIterShortLoop = LoopStripMiningIter / 10;
457 }
458 #endif // COMPILER2
459 }