1 /*
2 * Copyright (c) 2016, 2025, 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 "code/aotCodeCache.hpp"
26 #include "code/codeCache.hpp"
27 #include "compiler/compilerDefinitions.inline.hpp"
28 #include "interpreter/invocationCounter.hpp"
29 #include "jvm_io.h"
30 #include "runtime/arguments.hpp"
31 #include "runtime/continuation.hpp"
32 #include "runtime/flags/jvmFlag.hpp"
33 #include "runtime/flags/jvmFlagAccess.hpp"
34 #include "runtime/flags/jvmFlagConstraintsCompiler.hpp"
35 #include "runtime/flags/jvmFlagLimit.hpp"
36 #include "runtime/globals.hpp"
37 #include "runtime/globals_extension.hpp"
38 #include "utilities/defaultStream.hpp"
39
40 const char* compilertype2name_tab[compiler_number_of_types] = {
41 "",
42 "c1",
43 "c2",
44 "jvmci"
45 };
46
47 CompilationModeFlag::Mode CompilationModeFlag::_mode = CompilationModeFlag::Mode::NORMAL;
48
49 static void print_mode_unavailable(const char* mode_name, const char* reason) {
50 warning("%s compilation mode unavailable because %s.", mode_name, reason);
51 }
52
53 bool CompilationModeFlag::initialize() {
54 _mode = Mode::NORMAL;
55 // During parsing we want to be very careful not to use any methods of CompilerConfig that depend on
56 // CompilationModeFlag.
57 if (CompilationMode != nullptr) {
58 if (strcmp(CompilationMode, "default") == 0 || strcmp(CompilationMode, "normal") == 0) {
59 assert(_mode == Mode::NORMAL, "Precondition");
60 } else if (strcmp(CompilationMode, "quick-only") == 0) {
61 if (!CompilerConfig::has_c1()) {
62 print_mode_unavailable("quick-only", "there is no c1 present");
63 } else {
64 _mode = Mode::QUICK_ONLY;
65 }
66 } else if (strcmp(CompilationMode, "high-only") == 0) {
67 if (!CompilerConfig::has_c2() && !CompilerConfig::is_jvmci_compiler()) {
68 print_mode_unavailable("high-only", "there is no c2 or jvmci compiler present");
69 } else {
70 _mode = Mode::HIGH_ONLY;
71 }
72 } else if (strcmp(CompilationMode, "high-only-quick-internal") == 0) {
73 if (!CompilerConfig::has_c1() || !CompilerConfig::is_jvmci_compiler()) {
74 print_mode_unavailable("high-only-quick-internal", "there is no c1 and jvmci compiler present");
75 } else {
76 _mode = Mode::HIGH_ONLY_QUICK_INTERNAL;
77 }
78 } else {
79 print_error();
80 return false;
81 }
82 }
83
84 // Now that the flag is parsed, we can use any methods of CompilerConfig.
85 if (normal()) {
86 if (CompilerConfig::is_c1_simple_only()) {
87 _mode = Mode::QUICK_ONLY;
88 } else if (CompilerConfig::is_c2_or_jvmci_compiler_only()) {
89 _mode = Mode::HIGH_ONLY;
90 } else if (CompilerConfig::is_jvmci_compiler_enabled() && CompilerConfig::is_c1_enabled() && !TieredCompilation) {
91 warning("Disabling tiered compilation with non-native JVMCI compiler is not recommended, "
92 "disabling intermediate compilation levels instead. ");
93 _mode = Mode::HIGH_ONLY_QUICK_INTERNAL;
94 }
95 }
96 return true;
97 }
98
99 void CompilationModeFlag::print_error() {
100 jio_fprintf(defaultStream::error_stream(), "Unsupported compilation mode '%s', available modes are:", CompilationMode);
101 bool comma = false;
102 if (CompilerConfig::has_c1()) {
103 jio_fprintf(defaultStream::error_stream(), "%s quick-only", comma ? "," : "");
104 comma = true;
105 }
106 if (CompilerConfig::has_c2() || CompilerConfig::has_jvmci()) {
107 jio_fprintf(defaultStream::error_stream(), "%s high-only", comma ? "," : "");
108 comma = true;
109 }
110 if (CompilerConfig::has_c1() && CompilerConfig::has_jvmci()) {
111 jio_fprintf(defaultStream::error_stream(), "%s high-only-quick-internal", comma ? "," : "");
112 comma = true;
113 }
114 jio_fprintf(defaultStream::error_stream(), "\n");
115 }
116
117 // Returns threshold scaled with CompileThresholdScaling
118 intx CompilerConfig::scaled_compile_threshold(intx threshold) {
119 return scaled_compile_threshold(threshold, CompileThresholdScaling);
120 }
121
122 // Returns freq_log scaled with CompileThresholdScaling
123 intx CompilerConfig::scaled_freq_log(intx freq_log) {
124 return scaled_freq_log(freq_log, CompileThresholdScaling);
125 }
126
127 // For XXXThreshold flags, which all have a valid range of [0 .. max_jint]
128 intx CompilerConfig::jvmflag_scaled_compile_threshold(intx threshold) {
129 return MAX2((intx)0, MIN2(scaled_compile_threshold(threshold), (intx)max_jint));
130 }
131
132 // For XXXNotifyFreqLog flags, which all have a valid range of [0 .. 30]
133 intx CompilerConfig::jvmflag_scaled_freq_log(intx freq_log) {
134 return MAX2((intx)0, MIN2(scaled_freq_log(freq_log), (intx)30));
135 }
136
137 // Returns threshold scaled with the value of scale.
138 // If scale < 0.0, threshold is returned without scaling.
139 intx CompilerConfig::scaled_compile_threshold(intx threshold, double scale) {
140 assert(threshold >= 0, "must be");
141 if (scale == 1.0 || scale < 0.0) {
142 return threshold;
143 } else {
144 double v = threshold * scale;
145 assert(v >= 0, "must be");
146 if (g_isnan(v) || !g_isfinite(v)) {
147 return max_intx;
148 }
149 int exp;
150 (void) frexp(v, &exp);
151 int max_exp = sizeof(intx) * BitsPerByte - 1;
152 if (exp > max_exp) {
153 return max_intx;
154 }
155 intx r = (intx)(v);
156 assert(r >= 0, "must be");
157 return r;
158 }
159 }
160
161 // Returns freq_log scaled with the value of scale.
162 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
163 // If scale < 0.0, freq_log is returned without scaling.
164 intx CompilerConfig::scaled_freq_log(intx freq_log, double scale) {
165 // Check if scaling is necessary or if negative value was specified.
166 if (scale == 1.0 || scale < 0.0) {
167 return freq_log;
168 }
169 // Check values to avoid calculating log2 of 0.
170 if (scale == 0.0 || freq_log == 0) {
171 return 0;
172 }
173 // Determine the maximum notification frequency value currently supported.
174 // The largest mask value that the interpreter/C1 can handle is
175 // of length InvocationCounter::number_of_count_bits. Mask values are always
176 // one bit shorter then the value of the notification frequency. Set
177 // max_freq_bits accordingly.
178 int max_freq_bits = InvocationCounter::number_of_count_bits + 1;
179 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
180
181 if (scaled_freq == 0) {
182 // Return 0 right away to avoid calculating log2 of 0.
183 return 0;
184 } else {
185 return MIN2(log2i(scaled_freq), max_freq_bits);
186 }
187 }
188
189 void CompilerConfig::set_client_emulation_mode_flags() {
190 assert(has_c1(), "Must have C1 compiler present");
191 CompilationModeFlag::set_quick_only();
192
193 FLAG_SET_ERGO(ProfileInterpreter, false);
194 #if INCLUDE_JVMCI
195 FLAG_SET_ERGO(EnableJVMCI, false);
196 FLAG_SET_ERGO(UseJVMCICompiler, false);
197 #endif
198 if (FLAG_IS_DEFAULT(NeverActAsServerClassMachine)) {
199 FLAG_SET_ERGO(NeverActAsServerClassMachine, true);
200 }
201 if (FLAG_IS_DEFAULT(InitialCodeCacheSize)) {
202 FLAG_SET_ERGO(InitialCodeCacheSize, 160*K);
203 }
204 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
205 FLAG_SET_ERGO(ReservedCodeCacheSize, 32*M);
206 }
207 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) {
208 FLAG_SET_ERGO(NonProfiledCodeHeapSize, 27*M);
209 }
210 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) {
211 FLAG_SET_ERGO(ProfiledCodeHeapSize, 0);
212 }
213 if (FLAG_IS_DEFAULT(NonNMethodCodeHeapSize)) {
214 FLAG_SET_ERGO(NonNMethodCodeHeapSize, 5*M);
215 }
216 if (FLAG_IS_DEFAULT(CodeCacheExpansionSize)) {
217 FLAG_SET_ERGO(CodeCacheExpansionSize, 32*K);
218 }
219 if (FLAG_IS_DEFAULT(MaxRAM)) {
220 // Do not use FLAG_SET_ERGO to update MaxRAM, as this will impact
221 // heap setting done based on available phys_mem (see Arguments::set_heap_size).
222 FLAG_SET_DEFAULT(MaxRAM, 1ULL*G);
223 }
224 if (FLAG_IS_DEFAULT(CICompilerCount)) {
225 FLAG_SET_ERGO(CICompilerCount, 1);
226 }
227 }
228
229 bool CompilerConfig::is_compilation_mode_selected() {
230 return !FLAG_IS_DEFAULT(TieredCompilation) ||
231 !FLAG_IS_DEFAULT(TieredStopAtLevel) ||
232 !FLAG_IS_DEFAULT(CompilationMode)
233 JVMCI_ONLY(|| !FLAG_IS_DEFAULT(EnableJVMCI)
234 || !FLAG_IS_DEFAULT(UseJVMCICompiler));
235 }
236
237 static bool check_legacy_flags() {
238 JVMFlag* compile_threshold_flag = JVMFlag::flag_from_enum(FLAG_MEMBER_ENUM(CompileThreshold));
239 if (JVMFlagAccess::check_constraint(compile_threshold_flag, JVMFlagLimit::get_constraint(compile_threshold_flag)->constraint_func(), false) != JVMFlag::SUCCESS) {
240 return false;
241 }
242 JVMFlag* on_stack_replace_percentage_flag = JVMFlag::flag_from_enum(FLAG_MEMBER_ENUM(OnStackReplacePercentage));
243 if (JVMFlagAccess::check_constraint(on_stack_replace_percentage_flag, JVMFlagLimit::get_constraint(on_stack_replace_percentage_flag)->constraint_func(), false) != JVMFlag::SUCCESS) {
244 return false;
245 }
246 JVMFlag* interpreter_profile_percentage_flag = JVMFlag::flag_from_enum(FLAG_MEMBER_ENUM(InterpreterProfilePercentage));
247 if (JVMFlagAccess::check_range(interpreter_profile_percentage_flag, false) != JVMFlag::SUCCESS) {
248 return false;
249 }
250 return true;
251 }
252
253 void CompilerConfig::set_legacy_emulation_flags() {
254 // Any legacy flags set?
255 if (!FLAG_IS_DEFAULT(CompileThreshold) ||
256 !FLAG_IS_DEFAULT(OnStackReplacePercentage) ||
257 !FLAG_IS_DEFAULT(InterpreterProfilePercentage)) {
258 if (CompilerConfig::is_c1_only() || CompilerConfig::is_c2_or_jvmci_compiler_only()) {
259 // This function is called before these flags are validated. In order to not confuse the user with extraneous
260 // error messages, we check the validity of these flags here and bail out if any of them are invalid.
261 if (!check_legacy_flags()) {
262 return;
263 }
264 // Note, we do not scale CompileThreshold before this because the tiered flags are
265 // all going to be scaled further in set_compilation_policy_flags().
266 const intx threshold = CompileThreshold;
267 const intx profile_threshold = threshold * InterpreterProfilePercentage / 100;
268 const intx osr_threshold = threshold * OnStackReplacePercentage / 100;
269 const intx osr_profile_threshold = osr_threshold * InterpreterProfilePercentage / 100;
270
271 const intx threshold_log = log2i_graceful(CompilerConfig::is_c1_only() ? threshold : profile_threshold);
272 const intx osr_threshold_log = log2i_graceful(CompilerConfig::is_c1_only() ? osr_threshold : osr_profile_threshold);
273
274 if (Tier0InvokeNotifyFreqLog > threshold_log) {
275 FLAG_SET_ERGO(Tier0InvokeNotifyFreqLog, MAX2<intx>(0, threshold_log));
276 }
277
278 // Note: Emulation oddity. The legacy policy limited the amount of callbacks from the
279 // interpreter for backedge events to once every 1024 counter increments.
280 // We simulate this behavior by limiting the backedge notification frequency to be
281 // at least 2^10.
282 if (Tier0BackedgeNotifyFreqLog > osr_threshold_log) {
283 FLAG_SET_ERGO(Tier0BackedgeNotifyFreqLog, MAX2<intx>(10, osr_threshold_log));
284 }
285 // Adjust the tiered policy flags to approximate the legacy behavior.
286 FLAG_SET_ERGO(Tier3InvocationThreshold, threshold);
287 FLAG_SET_ERGO(Tier3MinInvocationThreshold, threshold);
288 FLAG_SET_ERGO(Tier3CompileThreshold, threshold);
289 FLAG_SET_ERGO(Tier3BackEdgeThreshold, osr_threshold);
290 if (CompilerConfig::is_c2_or_jvmci_compiler_only()) {
291 FLAG_SET_ERGO(Tier4InvocationThreshold, threshold);
292 FLAG_SET_ERGO(Tier4MinInvocationThreshold, threshold);
293 FLAG_SET_ERGO(Tier4CompileThreshold, threshold);
294 FLAG_SET_ERGO(Tier4BackEdgeThreshold, osr_threshold);
295 FLAG_SET_ERGO(Tier0ProfilingStartPercentage, InterpreterProfilePercentage);
296 }
297 } else {
298 // Normal tiered mode, ignore legacy flags
299 }
300 }
301 // Scale CompileThreshold
302 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
303 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0 && CompileThreshold > 0) {
304 intx scaled_value = scaled_compile_threshold(CompileThreshold);
305 if (CompileThresholdConstraintFunc(scaled_value, true) != JVMFlag::VIOLATES_CONSTRAINT) {
306 FLAG_SET_ERGO(CompileThreshold, scaled_value);
307 }
308 }
309 }
310
311
312 void CompilerConfig::set_compilation_policy_flags() {
313 if (is_tiered()) {
314 // Increase the code cache size - tiered compiles a lot more.
315 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
316 FLAG_SET_ERGO(ReservedCodeCacheSize,
317 MIN2(CODE_CACHE_DEFAULT_LIMIT, (size_t)ReservedCodeCacheSize * 5));
318 }
319 // Enable SegmentedCodeCache if tiered compilation is enabled, ReservedCodeCacheSize >= 240M
320 // and the code cache contains at least 8 pages (segmentation disables advantage of huge pages).
321 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M &&
322 8 * CodeCache::page_size() <= ReservedCodeCacheSize) {
323 FLAG_SET_ERGO(SegmentedCodeCache, true);
324 }
325 if (Arguments::is_compiler_only()) { // -Xcomp
326 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
327 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
328 // compile a level 4 (C2) and then continue executing it.
329 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
330 FLAG_SET_CMDLINE(Tier3InvokeNotifyFreqLog, 0);
331 }
332 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
333 FLAG_SET_CMDLINE(Tier4InvocationThreshold, 0);
334 }
335 }
336 }
337
338 // Current Leyden implementation requires SegmentedCodeCache: the archive-backed code
339 // cache would be initialized only then. Force SegmentedCodeCache if we are loading/storing
340 // cached code. TODO: Resolve this in code cache initialization code.
341 if (!SegmentedCodeCache && AOTCodeCache::is_caching_enabled()) {
342 FLAG_SET_ERGO(SegmentedCodeCache, true);
343 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
344 FLAG_SET_ERGO(ReservedCodeCacheSize,
345 MIN2(CODE_CACHE_DEFAULT_LIMIT, (size_t)ReservedCodeCacheSize * 5));
346 }
347 }
348
349 if (CompileThresholdScaling < 0) {
350 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", nullptr);
351 }
352
353 if (CompilationModeFlag::disable_intermediate()) {
354 if (FLAG_IS_DEFAULT(Tier0ProfilingStartPercentage)) {
355 FLAG_SET_DEFAULT(Tier0ProfilingStartPercentage, 33);
356 }
357
358 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
359 FLAG_SET_DEFAULT(Tier4InvocationThreshold, 5000);
360 }
361 if (FLAG_IS_DEFAULT(Tier4MinInvocationThreshold)) {
362 FLAG_SET_DEFAULT(Tier4MinInvocationThreshold, 600);
363 }
364 if (FLAG_IS_DEFAULT(Tier4CompileThreshold)) {
365 FLAG_SET_DEFAULT(Tier4CompileThreshold, 10000);
366 }
367 if (FLAG_IS_DEFAULT(Tier4BackEdgeThreshold)) {
368 FLAG_SET_DEFAULT(Tier4BackEdgeThreshold, 15000);
369 }
370
371 if (FLAG_IS_DEFAULT(Tier3InvocationThreshold)) {
372 FLAG_SET_DEFAULT(Tier3InvocationThreshold, Tier4InvocationThreshold);
373 }
374 if (FLAG_IS_DEFAULT(Tier3MinInvocationThreshold)) {
375 FLAG_SET_DEFAULT(Tier3MinInvocationThreshold, Tier4MinInvocationThreshold);
376 }
377 if (FLAG_IS_DEFAULT(Tier3CompileThreshold)) {
378 FLAG_SET_DEFAULT(Tier3CompileThreshold, Tier4CompileThreshold);
379 }
380 if (FLAG_IS_DEFAULT(Tier3BackEdgeThreshold)) {
381 FLAG_SET_DEFAULT(Tier3BackEdgeThreshold, Tier4BackEdgeThreshold);
382 }
383
384 }
385
386 // Scale tiered compilation thresholds.
387 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
388 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
389 FLAG_SET_ERGO(Tier0InvokeNotifyFreqLog, jvmflag_scaled_freq_log(Tier0InvokeNotifyFreqLog));
390 FLAG_SET_ERGO(Tier0BackedgeNotifyFreqLog, jvmflag_scaled_freq_log(Tier0BackedgeNotifyFreqLog));
391
392 FLAG_SET_ERGO(Tier3InvocationThreshold, jvmflag_scaled_compile_threshold(Tier3InvocationThreshold));
393 FLAG_SET_ERGO(Tier3MinInvocationThreshold, jvmflag_scaled_compile_threshold(Tier3MinInvocationThreshold));
394 FLAG_SET_ERGO(Tier3CompileThreshold, jvmflag_scaled_compile_threshold(Tier3CompileThreshold));
395 FLAG_SET_ERGO(Tier3BackEdgeThreshold, jvmflag_scaled_compile_threshold(Tier3BackEdgeThreshold));
396
397 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
398 // once these thresholds become supported.
399
400 FLAG_SET_ERGO(Tier2InvokeNotifyFreqLog, jvmflag_scaled_freq_log(Tier2InvokeNotifyFreqLog));
401 FLAG_SET_ERGO(Tier2BackedgeNotifyFreqLog, jvmflag_scaled_freq_log(Tier2BackedgeNotifyFreqLog));
402
403 FLAG_SET_ERGO(Tier3InvokeNotifyFreqLog, jvmflag_scaled_freq_log(Tier3InvokeNotifyFreqLog));
404 FLAG_SET_ERGO(Tier3BackedgeNotifyFreqLog, jvmflag_scaled_freq_log(Tier3BackedgeNotifyFreqLog));
405
406 FLAG_SET_ERGO(Tier23InlineeNotifyFreqLog, jvmflag_scaled_freq_log(Tier23InlineeNotifyFreqLog));
407
408 FLAG_SET_ERGO(Tier4InvocationThreshold, jvmflag_scaled_compile_threshold(Tier4InvocationThreshold));
409 FLAG_SET_ERGO(Tier4MinInvocationThreshold, jvmflag_scaled_compile_threshold(Tier4MinInvocationThreshold));
410 FLAG_SET_ERGO(Tier4CompileThreshold, jvmflag_scaled_compile_threshold(Tier4CompileThreshold));
411 FLAG_SET_ERGO(Tier4BackEdgeThreshold, jvmflag_scaled_compile_threshold(Tier4BackEdgeThreshold));
412 }
413
414 #ifdef COMPILER1
415 // Reduce stack usage due to inlining of methods which require much stack.
416 // (High tier compiler can inline better based on profiling information.)
417 if (FLAG_IS_DEFAULT(C1InlineStackLimit) &&
418 TieredStopAtLevel == CompLevel_full_optimization && !CompilerConfig::is_c1_only()) {
419 FLAG_SET_DEFAULT(C1InlineStackLimit, 5);
420 }
421 #endif
422
423 if (CompilerConfig::is_tiered() && CompilerConfig::is_c2_enabled()) {
424 #ifdef COMPILER2
425 // Some inlining tuning
426 #if defined(X86) || defined(AARCH64) || defined(RISCV64)
427 if (FLAG_IS_DEFAULT(InlineSmallCode)) {
428 FLAG_SET_DEFAULT(InlineSmallCode, 2500);
429 }
430 #endif
431 #endif // COMPILER2
432 }
433
434 }
435
436 #if INCLUDE_JVMCI
437 void CompilerConfig::set_jvmci_specific_flags() {
438 if (UseJVMCICompiler) {
439 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
440 FLAG_SET_DEFAULT(TypeProfileWidth, 8);
441 }
442 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
443 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
444 }
445
446 if (UseJVMCINativeLibrary) {
447 // SVM compiled code requires more stack space
448 if (FLAG_IS_DEFAULT(CompilerThreadStackSize)) {
449 // Duplicate logic in the implementations of os::create_thread
450 // so that we can then double the computed stack size. Once
451 // the stack size requirements of SVM are better understood,
452 // this logic can be pushed down into os::create_thread.
453 int stack_size = CompilerThreadStackSize;
454 if (stack_size == 0) {
455 stack_size = VMThreadStackSize;
456 }
457 if (stack_size != 0) {
458 FLAG_SET_DEFAULT(CompilerThreadStackSize, stack_size * 2);
459 }
460 }
461 } else {
462 // JVMCI needs values not less than defaults
463 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
464 FLAG_SET_DEFAULT(ReservedCodeCacheSize, MAX2(64*M, ReservedCodeCacheSize));
465 }
466 if (FLAG_IS_DEFAULT(InitialCodeCacheSize)) {
467 FLAG_SET_DEFAULT(InitialCodeCacheSize, MAX2(16*M, InitialCodeCacheSize));
468 }
469 if (FLAG_IS_DEFAULT(NewSizeThreadIncrease)) {
470 FLAG_SET_DEFAULT(NewSizeThreadIncrease, MAX2(4*K, NewSizeThreadIncrease));
471 }
472 if (FLAG_IS_DEFAULT(Tier3DelayOn)) {
473 // This effectively prevents the compile broker scheduling tier 2
474 // (i.e., limited C1 profiling) compilations instead of tier 3
475 // (i.e., full C1 profiling) compilations when the tier 4 queue
476 // backs up (which is quite likely when using a non-AOT compiled JVMCI
477 // compiler). The observation based on jargraal is that the downside
478 // of skipping full profiling is much worse for performance than the
479 // queue backing up.
480 FLAG_SET_DEFAULT(Tier3DelayOn, 100000);
481 }
482 } // !UseJVMCINativeLibrary
483 } // UseJVMCICompiler
484 }
485 #endif // INCLUDE_JVMCI
486
487 bool CompilerConfig::check_args_consistency(bool status) {
488 // Check lower bounds of the code cache
489 // Template Interpreter code is approximately 3X larger in debug builds.
490 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
491 if (ReservedCodeCacheSize < InitialCodeCacheSize) {
492 jio_fprintf(defaultStream::error_stream(),
493 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
494 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
495 status = false;
496 } else if (ReservedCodeCacheSize < min_code_cache_size) {
497 jio_fprintf(defaultStream::error_stream(),
498 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
499 min_code_cache_size/K);
500 status = false;
501 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
502 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
503 jio_fprintf(defaultStream::error_stream(),
504 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
505 CODE_CACHE_SIZE_LIMIT/M);
506 status = false;
507 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
508 jio_fprintf(defaultStream::error_stream(),
509 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
510 min_code_cache_size/K);
511 status = false;
512 }
513
514 #ifdef _LP64
515 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
516 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
517 }
518 #endif
519
520 if (BackgroundCompilation && ReplayCompiles) {
521 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
522 warning("BackgroundCompilation disabled due to ReplayCompiles option.");
523 }
524 FLAG_SET_CMDLINE(BackgroundCompilation, false);
525 }
526
527 if (CompilerConfig::is_interpreter_only()) {
528 if (UseCompiler) {
529 if (!FLAG_IS_DEFAULT(UseCompiler)) {
530 warning("UseCompiler disabled due to -Xint.");
531 }
532 FLAG_SET_CMDLINE(UseCompiler, false);
533 }
534 if (ProfileInterpreter) {
535 if (!FLAG_IS_DEFAULT(ProfileInterpreter)) {
536 warning("ProfileInterpreter disabled due to -Xint.");
537 }
538 FLAG_SET_CMDLINE(ProfileInterpreter, false);
539 }
540 if (TieredCompilation) {
541 if (!FLAG_IS_DEFAULT(TieredCompilation)) {
542 warning("TieredCompilation disabled due to -Xint.");
543 }
544 FLAG_SET_CMDLINE(TieredCompilation, false);
545 }
546 if (SegmentedCodeCache) {
547 warning("SegmentedCodeCache has no meaningful effect with -Xint");
548 FLAG_SET_DEFAULT(SegmentedCodeCache, false);
549 }
550 #if INCLUDE_JVMCI
551 if (EnableJVMCI || UseJVMCICompiler) {
552 if (!FLAG_IS_DEFAULT(EnableJVMCI) || !FLAG_IS_DEFAULT(UseJVMCICompiler)) {
553 warning("JVMCI Compiler disabled due to -Xint.");
554 }
555 FLAG_SET_CMDLINE(EnableJVMCI, false);
556 FLAG_SET_CMDLINE(UseJVMCICompiler, false);
557 }
558 #endif
559 } else {
560 #if INCLUDE_JVMCI
561 status = status && JVMCIGlobals::check_jvmci_flags_are_consistent();
562 #endif
563 }
564
565 return status;
566 }
567
568 void CompilerConfig::ergo_initialize() {
569 #if !COMPILER1_OR_COMPILER2
570 return;
571 #endif
572
573 if (has_c1()) {
574 if (!is_compilation_mode_selected()) {
575 if (NeverActAsServerClassMachine) {
576 set_client_emulation_mode_flags();
577 }
578 } else if (!has_c2() && !is_jvmci_compiler()) {
579 set_client_emulation_mode_flags();
580 }
581 }
582
583 set_legacy_emulation_flags();
584 set_compilation_policy_flags();
585
586 #if INCLUDE_JVMCI
587 // Check that JVMCI supports selected GC.
588 // Should be done after GCConfig::initialize() was called.
589 JVMCIGlobals::check_jvmci_supported_gc();
590
591 // Do JVMCI specific settings
592 set_jvmci_specific_flags();
593 #endif
594
595 if (PreloadOnly) {
596 // Disable profiling/counter updates in interpreter and C1.
597 // This effectively disables most of the normal JIT (re-)compilations.
598 FLAG_SET_DEFAULT(ProfileInterpreter, false);
599 FLAG_SET_DEFAULT(UseOnStackReplacement, false);
600 FLAG_SET_DEFAULT(UseLoopCounter, false);
601
602 // Disable compilations through training data replay.
603 FLAG_SET_DEFAULT(AOTReplayTraining, false);
604 }
605
606 if (UseOnStackReplacement && !UseLoopCounter) {
607 warning("On-stack-replacement requires loop counters; enabling loop counters");
608 FLAG_SET_DEFAULT(UseLoopCounter, true);
609 }
610
611 if (ProfileInterpreter && CompilerConfig::is_c1_simple_only()) {
612 if (!FLAG_IS_DEFAULT(ProfileInterpreter)) {
613 warning("ProfileInterpreter disabled due to client emulation mode");
614 }
615 FLAG_SET_CMDLINE(ProfileInterpreter, false);
616 }
617
618 #ifdef COMPILER2
619 if (!EliminateLocks) {
620 EliminateNestedLocks = false;
621 }
622 if (!Inline || !IncrementalInline) {
623 IncrementalInline = false;
624 IncrementalInlineMH = false;
625 IncrementalInlineVirtual = false;
626 StressIncrementalInlining = false;
627 }
628 #ifndef PRODUCT
629 if (!IncrementalInline) {
630 AlwaysIncrementalInline = false;
631 }
632 if (FLAG_IS_CMDLINE(PrintIdealGraph) && !PrintIdealGraph) {
633 FLAG_SET_ERGO(PrintIdealGraphLevel, -1);
634 }
635 #endif
636 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
637 // nothing to use the profiling, turn if off
638 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
639 }
640 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
641 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
642 }
643 if (FLAG_IS_DEFAULT(LoopStripMiningIterShortLoop)) {
644 // blind guess
645 LoopStripMiningIterShortLoop = LoopStripMiningIter / 10;
646 }
647 #endif // COMPILER2
648 }