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