1 /*
2 * Copyright (c) 2016, 2026, 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(InitialCodeCacheSize)) {
198 FLAG_SET_ERGO(InitialCodeCacheSize, 160*K);
199 }
200 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
201 FLAG_SET_ERGO(ReservedCodeCacheSize, 32*M);
202 }
203 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) {
204 FLAG_SET_ERGO(NonProfiledCodeHeapSize, 27*M);
205 }
206 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) {
207 FLAG_SET_ERGO(ProfiledCodeHeapSize, 0);
208 }
209 if (FLAG_IS_DEFAULT(NonNMethodCodeHeapSize)) {
210 FLAG_SET_ERGO(NonNMethodCodeHeapSize, 5*M);
211 }
212 if (FLAG_IS_DEFAULT(CodeCacheExpansionSize)) {
213 FLAG_SET_ERGO(CodeCacheExpansionSize, 32*K);
214 }
215 if (FLAG_IS_DEFAULT(CICompilerCount)) {
216 FLAG_SET_ERGO(CICompilerCount, 1);
217 }
218 }
219
220 bool CompilerConfig::is_compilation_mode_selected() {
221 return !FLAG_IS_DEFAULT(TieredCompilation) ||
222 !FLAG_IS_DEFAULT(TieredStopAtLevel) ||
223 !FLAG_IS_DEFAULT(CompilationMode)
224 JVMCI_ONLY(|| !FLAG_IS_DEFAULT(EnableJVMCI)
225 || !FLAG_IS_DEFAULT(UseJVMCICompiler));
226 }
227
228 static bool check_legacy_flags() {
229 JVMFlag* compile_threshold_flag = JVMFlag::flag_from_enum(FLAG_MEMBER_ENUM(CompileThreshold));
230 if (JVMFlagAccess::check_constraint(compile_threshold_flag, JVMFlagLimit::get_constraint(compile_threshold_flag)->constraint_func(), false) != JVMFlag::SUCCESS) {
231 return false;
232 }
233 JVMFlag* on_stack_replace_percentage_flag = JVMFlag::flag_from_enum(FLAG_MEMBER_ENUM(OnStackReplacePercentage));
234 if (JVMFlagAccess::check_constraint(on_stack_replace_percentage_flag, JVMFlagLimit::get_constraint(on_stack_replace_percentage_flag)->constraint_func(), false) != JVMFlag::SUCCESS) {
235 return false;
236 }
237 JVMFlag* interpreter_profile_percentage_flag = JVMFlag::flag_from_enum(FLAG_MEMBER_ENUM(InterpreterProfilePercentage));
238 if (JVMFlagAccess::check_range(interpreter_profile_percentage_flag, false) != JVMFlag::SUCCESS) {
239 return false;
240 }
241 return true;
242 }
243
244 void CompilerConfig::set_legacy_emulation_flags() {
245 // Any legacy flags set?
246 if (!FLAG_IS_DEFAULT(CompileThreshold) ||
247 !FLAG_IS_DEFAULT(OnStackReplacePercentage) ||
248 !FLAG_IS_DEFAULT(InterpreterProfilePercentage)) {
249 if (CompilerConfig::is_c1_only() || CompilerConfig::is_c2_or_jvmci_compiler_only()) {
250 // This function is called before these flags are validated. In order to not confuse the user with extraneous
251 // error messages, we check the validity of these flags here and bail out if any of them are invalid.
252 if (!check_legacy_flags()) {
253 return;
254 }
255 // Note, we do not scale CompileThreshold before this because the tiered flags are
256 // all going to be scaled further in set_compilation_policy_flags().
257 const intx threshold = CompileThreshold;
258 const intx profile_threshold = threshold * InterpreterProfilePercentage / 100;
259 const intx osr_threshold = threshold * OnStackReplacePercentage / 100;
260 const intx osr_profile_threshold = osr_threshold * InterpreterProfilePercentage / 100;
261
262 const intx threshold_log = log2i_graceful(CompilerConfig::is_c1_only() ? threshold : profile_threshold);
263 const intx osr_threshold_log = log2i_graceful(CompilerConfig::is_c1_only() ? osr_threshold : osr_profile_threshold);
264
265 if (Tier0InvokeNotifyFreqLog > threshold_log) {
266 FLAG_SET_ERGO(Tier0InvokeNotifyFreqLog, MAX2<intx>(0, threshold_log));
267 }
268
269 // Note: Emulation oddity. The legacy policy limited the amount of callbacks from the
270 // interpreter for backedge events to once every 1024 counter increments.
271 // We simulate this behavior by limiting the backedge notification frequency to be
272 // at least 2^10.
273 if (Tier0BackedgeNotifyFreqLog > osr_threshold_log) {
274 FLAG_SET_ERGO(Tier0BackedgeNotifyFreqLog, MAX2<intx>(10, osr_threshold_log));
275 }
276 // Adjust the tiered policy flags to approximate the legacy behavior.
277 FLAG_SET_ERGO(Tier3InvocationThreshold, threshold);
278 FLAG_SET_ERGO(Tier3MinInvocationThreshold, threshold);
279 FLAG_SET_ERGO(Tier3CompileThreshold, threshold);
280 FLAG_SET_ERGO(Tier3BackEdgeThreshold, osr_threshold);
281 if (CompilerConfig::is_c2_or_jvmci_compiler_only()) {
282 FLAG_SET_ERGO(Tier4InvocationThreshold, threshold);
283 FLAG_SET_ERGO(Tier4MinInvocationThreshold, threshold);
284 FLAG_SET_ERGO(Tier4CompileThreshold, threshold);
285 FLAG_SET_ERGO(Tier4BackEdgeThreshold, osr_threshold);
286 FLAG_SET_ERGO(Tier0ProfilingStartPercentage, InterpreterProfilePercentage);
287 }
288 } else {
289 // Normal tiered mode, ignore legacy flags
290 }
291 }
292 // Scale CompileThreshold
293 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
294 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0 && CompileThreshold > 0) {
295 intx scaled_value = scaled_compile_threshold(CompileThreshold);
296 if (CompileThresholdConstraintFunc(scaled_value, true) != JVMFlag::VIOLATES_CONSTRAINT) {
297 FLAG_SET_ERGO(CompileThreshold, scaled_value);
298 }
299 }
300 }
301
302
303 void CompilerConfig::set_compilation_policy_flags() {
304 if (is_tiered()) {
305 // Increase the code cache size - tiered compiles a lot more.
306 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
307 FLAG_SET_ERGO(ReservedCodeCacheSize,
308 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
309 }
310 // Enable SegmentedCodeCache if tiered compilation is enabled, ReservedCodeCacheSize >= 240M
311 // and the code cache contains at least 8 pages (segmentation disables advantage of huge pages).
312 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M &&
313 8 * CodeCache::page_size() <= ReservedCodeCacheSize) {
314 FLAG_SET_ERGO(SegmentedCodeCache, true);
315 }
316 if (Arguments::is_compiler_only()) { // -Xcomp
317 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
318 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
319 // compile a level 4 (C2) and then continue executing it.
320 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
321 FLAG_SET_CMDLINE(Tier3InvokeNotifyFreqLog, 0);
322 }
323 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
324 FLAG_SET_CMDLINE(Tier4InvocationThreshold, 0);
325 }
326 }
327 }
328
329 if (CompileThresholdScaling < 0) {
330 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", nullptr);
331 }
332
333 if (CompilationModeFlag::disable_intermediate()) {
334 if (FLAG_IS_DEFAULT(Tier0ProfilingStartPercentage)) {
335 FLAG_SET_DEFAULT(Tier0ProfilingStartPercentage, 33);
336 }
337
338 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
339 FLAG_SET_DEFAULT(Tier4InvocationThreshold, 5000);
340 }
341 if (FLAG_IS_DEFAULT(Tier4MinInvocationThreshold)) {
342 FLAG_SET_DEFAULT(Tier4MinInvocationThreshold, 600);
343 }
344 if (FLAG_IS_DEFAULT(Tier4CompileThreshold)) {
345 FLAG_SET_DEFAULT(Tier4CompileThreshold, 10000);
346 }
347 if (FLAG_IS_DEFAULT(Tier4BackEdgeThreshold)) {
348 FLAG_SET_DEFAULT(Tier4BackEdgeThreshold, 15000);
349 }
350
351 if (FLAG_IS_DEFAULT(Tier3InvocationThreshold)) {
352 FLAG_SET_DEFAULT(Tier3InvocationThreshold, Tier4InvocationThreshold);
353 }
354 if (FLAG_IS_DEFAULT(Tier3MinInvocationThreshold)) {
355 FLAG_SET_DEFAULT(Tier3MinInvocationThreshold, Tier4MinInvocationThreshold);
356 }
357 if (FLAG_IS_DEFAULT(Tier3CompileThreshold)) {
358 FLAG_SET_DEFAULT(Tier3CompileThreshold, Tier4CompileThreshold);
359 }
360 if (FLAG_IS_DEFAULT(Tier3BackEdgeThreshold)) {
361 FLAG_SET_DEFAULT(Tier3BackEdgeThreshold, Tier4BackEdgeThreshold);
362 }
363
364 }
365
366 // Scale tiered compilation thresholds.
367 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
368 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
369 FLAG_SET_ERGO(Tier0InvokeNotifyFreqLog, jvmflag_scaled_freq_log(Tier0InvokeNotifyFreqLog));
370 FLAG_SET_ERGO(Tier0BackedgeNotifyFreqLog, jvmflag_scaled_freq_log(Tier0BackedgeNotifyFreqLog));
371
372 FLAG_SET_ERGO(Tier3InvocationThreshold, jvmflag_scaled_compile_threshold(Tier3InvocationThreshold));
373 FLAG_SET_ERGO(Tier3MinInvocationThreshold, jvmflag_scaled_compile_threshold(Tier3MinInvocationThreshold));
374 FLAG_SET_ERGO(Tier3CompileThreshold, jvmflag_scaled_compile_threshold(Tier3CompileThreshold));
375 FLAG_SET_ERGO(Tier3BackEdgeThreshold, jvmflag_scaled_compile_threshold(Tier3BackEdgeThreshold));
376
377 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
378 // once these thresholds become supported.
379
380 FLAG_SET_ERGO(Tier2InvokeNotifyFreqLog, jvmflag_scaled_freq_log(Tier2InvokeNotifyFreqLog));
381 FLAG_SET_ERGO(Tier2BackedgeNotifyFreqLog, jvmflag_scaled_freq_log(Tier2BackedgeNotifyFreqLog));
382
383 FLAG_SET_ERGO(Tier3InvokeNotifyFreqLog, jvmflag_scaled_freq_log(Tier3InvokeNotifyFreqLog));
384 FLAG_SET_ERGO(Tier3BackedgeNotifyFreqLog, jvmflag_scaled_freq_log(Tier3BackedgeNotifyFreqLog));
385
386 FLAG_SET_ERGO(Tier23InlineeNotifyFreqLog, jvmflag_scaled_freq_log(Tier23InlineeNotifyFreqLog));
387
388 FLAG_SET_ERGO(Tier4InvocationThreshold, jvmflag_scaled_compile_threshold(Tier4InvocationThreshold));
389 FLAG_SET_ERGO(Tier4MinInvocationThreshold, jvmflag_scaled_compile_threshold(Tier4MinInvocationThreshold));
390 FLAG_SET_ERGO(Tier4CompileThreshold, jvmflag_scaled_compile_threshold(Tier4CompileThreshold));
391 FLAG_SET_ERGO(Tier4BackEdgeThreshold, jvmflag_scaled_compile_threshold(Tier4BackEdgeThreshold));
392 }
393
394 #ifdef COMPILER1
395 // Reduce stack usage due to inlining of methods which require much stack.
396 // (High tier compiler can inline better based on profiling information.)
397 if (FLAG_IS_DEFAULT(C1InlineStackLimit) &&
398 TieredStopAtLevel == CompLevel_full_optimization && !CompilerConfig::is_c1_only()) {
399 FLAG_SET_DEFAULT(C1InlineStackLimit, 5);
400 }
401 #endif
402
403 if (CompilerConfig::is_tiered() && CompilerConfig::is_c2_enabled()) {
404 #if defined(COMPILER2) && defined(_LP64)
405 // LP64 specific inlining tuning for C2
406 if (FLAG_IS_DEFAULT(InlineSmallCode)) {
407 FLAG_SET_DEFAULT(InlineSmallCode, 2500);
408 }
409 #endif
410 }
411
412 }
413
414 #if INCLUDE_JVMCI
415 void CompilerConfig::set_jvmci_specific_flags() {
416 if (UseJVMCICompiler) {
417 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
418 FLAG_SET_DEFAULT(TypeProfileWidth, 8);
419 }
420 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
421 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
422 }
423
424 if (UseJVMCINativeLibrary) {
425 // SVM compiled code requires more stack space
426 if (FLAG_IS_DEFAULT(CompilerThreadStackSize)) {
427 // Duplicate logic in the implementations of os::create_thread
428 // so that we can then double the computed stack size. Once
429 // the stack size requirements of SVM are better understood,
430 // this logic can be pushed down into os::create_thread.
431 int stack_size = CompilerThreadStackSize;
432 if (stack_size == 0) {
433 stack_size = VMThreadStackSize;
434 }
435 if (stack_size != 0) {
436 FLAG_SET_DEFAULT(CompilerThreadStackSize, stack_size * 2);
437 }
438 }
439 } else {
440 // JVMCI needs values not less than defaults
441 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
442 FLAG_SET_DEFAULT(ReservedCodeCacheSize, MAX2(64*M, ReservedCodeCacheSize));
443 }
444 if (FLAG_IS_DEFAULT(InitialCodeCacheSize)) {
445 FLAG_SET_DEFAULT(InitialCodeCacheSize, MAX2(16*M, InitialCodeCacheSize));
446 }
447 if (FLAG_IS_DEFAULT(Tier3DelayOn)) {
448 // This effectively prevents the compile broker scheduling tier 2
449 // (i.e., limited C1 profiling) compilations instead of tier 3
450 // (i.e., full C1 profiling) compilations when the tier 4 queue
451 // backs up (which is quite likely when using a non-AOT compiled JVMCI
452 // compiler). The observation based on jargraal is that the downside
453 // of skipping full profiling is much worse for performance than the
454 // queue backing up.
455 FLAG_SET_DEFAULT(Tier3DelayOn, 100000);
456 }
457 } // !UseJVMCINativeLibrary
458 } // UseJVMCICompiler
459 }
460 #endif // INCLUDE_JVMCI
461
462 bool CompilerConfig::check_args_consistency(bool status) {
463 // Check lower bounds of the code cache
464 // Template Interpreter code is approximately 3X larger in debug builds.
465 size_t min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
466 if (ReservedCodeCacheSize < InitialCodeCacheSize) {
467 jio_fprintf(defaultStream::error_stream(),
468 "Invalid ReservedCodeCacheSize: %zuK. Must be at least InitialCodeCacheSize=%zuK.\n",
469 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
470 status = false;
471 } else if (ReservedCodeCacheSize < min_code_cache_size) {
472 jio_fprintf(defaultStream::error_stream(),
473 "Invalid ReservedCodeCacheSize=%zuK. Must be at least %zuK.\n", ReservedCodeCacheSize/K,
474 min_code_cache_size/K);
475 status = false;
476 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
477 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
478 jio_fprintf(defaultStream::error_stream(),
479 "Invalid ReservedCodeCacheSize=%zuM. Must be at most %zuM.\n", ReservedCodeCacheSize/M,
480 CODE_CACHE_SIZE_LIMIT/M);
481 status = false;
482 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
483 jio_fprintf(defaultStream::error_stream(),
484 "Invalid NonNMethodCodeHeapSize=%zuK. Must be at least %zuK.\n", NonNMethodCodeHeapSize/K,
485 min_code_cache_size/K);
486 status = false;
487 }
488
489 #ifdef _LP64
490 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
491 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
492 }
493 #endif
494
495 if (BackgroundCompilation && ReplayCompiles) {
496 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
497 warning("BackgroundCompilation disabled due to ReplayCompiles option.");
498 }
499 FLAG_SET_CMDLINE(BackgroundCompilation, false);
500 }
501
502 if (CompilerConfig::is_interpreter_only()) {
503 if (UseCompiler) {
504 if (!FLAG_IS_DEFAULT(UseCompiler)) {
505 warning("UseCompiler disabled due to -Xint.");
506 }
507 FLAG_SET_CMDLINE(UseCompiler, false);
508 }
509 if (ProfileInterpreter) {
510 if (!FLAG_IS_DEFAULT(ProfileInterpreter)) {
511 warning("ProfileInterpreter disabled due to -Xint.");
512 }
513 FLAG_SET_CMDLINE(ProfileInterpreter, false);
514 }
515 if (TieredCompilation) {
516 if (!FLAG_IS_DEFAULT(TieredCompilation)) {
517 warning("TieredCompilation disabled due to -Xint.");
518 }
519 FLAG_SET_CMDLINE(TieredCompilation, false);
520 }
521 if (SegmentedCodeCache) {
522 warning("SegmentedCodeCache has no meaningful effect with -Xint");
523 FLAG_SET_DEFAULT(SegmentedCodeCache, false);
524 }
525 #if INCLUDE_JVMCI
526 if (EnableJVMCI || UseJVMCICompiler) {
527 if (!FLAG_IS_DEFAULT(EnableJVMCI) || !FLAG_IS_DEFAULT(UseJVMCICompiler)) {
528 warning("JVMCI Compiler disabled due to -Xint.");
529 }
530 FLAG_SET_CMDLINE(EnableJVMCI, false);
531 FLAG_SET_CMDLINE(UseJVMCICompiler, false);
532 }
533 #endif
534 } else {
535 #if INCLUDE_JVMCI
536 status = status && JVMCIGlobals::check_jvmci_flags_are_consistent();
537 #endif
538 }
539
540 return status;
541 }
542
543 bool CompilerConfig::should_set_client_emulation_mode_flags() {
544 #if !COMPILER1_OR_COMPILER2
545 return false;
546 #endif
547
548 return has_c1() &&
549 is_compilation_mode_selected() &&
550 !has_c2() &&
551 !is_jvmci_compiler();
552 }
553
554 void CompilerConfig::ergo_initialize() {
555 #if !COMPILER1_OR_COMPILER2
556 return;
557 #endif
558
559 // This property is also checked when selecting the heap size. Since client
560 // emulation mode influences Java heap memory usage, part of the logic must
561 // occur before choosing the heap size.
562 if (should_set_client_emulation_mode_flags()) {
563 set_client_emulation_mode_flags();
564 }
565
566 set_legacy_emulation_flags();
567 set_compilation_policy_flags();
568
569 #if INCLUDE_JVMCI
570 // Check that JVMCI supports selected GC.
571 // Should be done after GCConfig::initialize() was called.
572 JVMCIGlobals::check_jvmci_supported_gc();
573
574 // Do JVMCI specific settings
575 set_jvmci_specific_flags();
576 #endif
577
578 if (UseOnStackReplacement && !UseLoopCounter) {
579 warning("On-stack-replacement requires loop counters; enabling loop counters");
580 FLAG_SET_DEFAULT(UseLoopCounter, true);
581 }
582
583 if (ProfileInterpreter && CompilerConfig::is_c1_simple_only()) {
584 if (!FLAG_IS_DEFAULT(ProfileInterpreter)) {
585 warning("ProfileInterpreter disabled due to client emulation mode");
586 }
587 FLAG_SET_CMDLINE(ProfileInterpreter, false);
588 }
589
590 #ifdef COMPILER2
591 if (!EliminateLocks) {
592 EliminateNestedLocks = false;
593 }
594 if (!Inline || !IncrementalInline) {
595 IncrementalInline = false;
596 IncrementalInlineMH = false;
597 IncrementalInlineVirtual = false;
598 StressIncrementalInlining = false;
599 }
600 #ifndef PRODUCT
601 if (!IncrementalInline) {
602 AlwaysIncrementalInline = false;
603 }
604 if (FLAG_IS_CMDLINE(PrintIdealGraph) && !PrintIdealGraph) {
605 FLAG_SET_ERGO(PrintIdealGraphLevel, -1);
606 }
607 #endif
608 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
609 // nothing to use the profiling, turn if off
610 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
611 }
612 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
613 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
614 }
615 if (FLAG_IS_DEFAULT(LoopStripMiningIterShortLoop)) {
616 // blind guess
617 LoopStripMiningIterShortLoop = LoopStripMiningIter / 10;
618 }
619 if (UseAutoVectorizationSpeculativeAliasingChecks && !LoopMultiversioning && !UseAutoVectorizationPredicate) {
620 warning("Disabling UseAutoVectorizationSpeculativeAliasingChecks, because neither of the following is enabled:"
621 " LoopMultiversioning UseAutoVectorizationPredicate");
622 UseAutoVectorizationSpeculativeAliasingChecks = false;
623 }
624 #endif // COMPILER2
625 }