1 /* 2 * Copyright (c) 2000, 2014, 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/compiledIC.hpp" 27 #include "code/nmethod.hpp" 28 #include "code/scopeDesc.hpp" 29 #include "compiler/compilerOracle.hpp" 30 #include "interpreter/interpreter.hpp" 31 #include "oops/methodData.hpp" 32 #include "oops/method.hpp" 33 #include "oops/oop.inline.hpp" 34 #include "prims/nativeLookup.hpp" 35 #include "runtime/advancedThresholdPolicy.hpp" 36 #include "runtime/compilationPolicy.hpp" 37 #include "runtime/frame.hpp" 38 #include "runtime/handles.inline.hpp" 39 #include "runtime/rframe.hpp" 40 #include "runtime/simpleThresholdPolicy.hpp" 41 #include "runtime/stubRoutines.hpp" 42 #include "runtime/thread.hpp" 43 #include "runtime/timer.hpp" 44 #include "runtime/vframe.hpp" 45 #include "runtime/vm_operations.hpp" 46 #include "utilities/events.hpp" 47 #include "utilities/globalDefinitions.hpp" 48 49 CompilationPolicy* CompilationPolicy::_policy; 50 elapsedTimer CompilationPolicy::_accumulated_time; 51 bool CompilationPolicy::_in_vm_startup; 52 53 // Determine compilation policy based on command line argument 54 void compilationPolicy_init() { 55 CompilationPolicy::set_in_vm_startup(DelayCompilationDuringStartup); 56 57 switch(CompilationPolicyChoice) { 58 case 0: 59 CompilationPolicy::set_policy(new SimpleCompPolicy()); 60 break; 61 62 case 1: 63 #ifdef COMPILER2 64 CompilationPolicy::set_policy(new StackWalkCompPolicy()); 65 #else 66 Unimplemented(); 67 #endif 68 break; 69 case 2: 70 #ifdef TIERED 71 CompilationPolicy::set_policy(new SimpleThresholdPolicy()); 72 #else 73 Unimplemented(); 74 #endif 75 break; 76 case 3: 77 #ifdef TIERED 78 CompilationPolicy::set_policy(new AdvancedThresholdPolicy()); 79 #else 80 Unimplemented(); 81 #endif 82 break; 83 default: 84 fatal("CompilationPolicyChoice must be in the range: [0-3]"); 85 } 86 CompilationPolicy::policy()->initialize(); 87 } 88 89 void CompilationPolicy::completed_vm_startup() { 90 if (TraceCompilationPolicy) { 91 tty->print("CompilationPolicy: completed vm startup.\n"); 92 } 93 _in_vm_startup = false; 94 } 95 96 // Returns true if m must be compiled before executing it 97 // This is intended to force compiles for methods (usually for 98 // debugging) that would otherwise be interpreted for some reason. 99 bool CompilationPolicy::must_be_compiled(methodHandle m, int comp_level) { 100 // Don't allow Xcomp to cause compiles in replay mode 101 if (ReplayCompiles) return false; 102 103 if (m->has_compiled_code()) return false; // already compiled 104 if (!can_be_compiled(m, comp_level)) return false; 105 106 return !UseInterpreter || // must compile all methods 107 (UseCompiler && AlwaysCompileLoopMethods && m->has_loops() && CompileBroker::should_compile_new_jobs()); // eagerly compile loop methods 108 } 109 110 // Returns true if m is allowed to be compiled 111 bool CompilationPolicy::can_be_compiled(methodHandle m, int comp_level) { 112 // allow any levels for WhiteBox 113 assert(WhiteBoxAPI || comp_level == CompLevel_all || is_compile(comp_level), "illegal compilation level"); 114 115 if (m->is_abstract()) return false; 116 if (DontCompileHugeMethods && m->code_size() > HugeMethodLimit) return false; 117 118 // Math intrinsics should never be compiled as this can lead to 119 // monotonicity problems because the interpreter will prefer the 120 // compiled code to the intrinsic version. This can't happen in 121 // production because the invocation counter can't be incremented 122 // but we shouldn't expose the system to this problem in testing 123 // modes. 124 if (!AbstractInterpreter::can_be_compiled(m)) { 125 return false; 126 } 127 if (comp_level == CompLevel_all) { 128 if (TieredCompilation) { 129 // enough to be compilable at any level for tiered 130 return !m->is_not_compilable(CompLevel_simple) || !m->is_not_compilable(CompLevel_full_optimization); 131 } else { 132 // must be compilable at available level for non-tiered 133 return !m->is_not_compilable(CompLevel_highest_tier); 134 } 135 } else if (is_compile(comp_level)) { 136 return !m->is_not_compilable(comp_level); 137 } 138 return false; 139 } 140 141 // Returns true if m is allowed to be osr compiled 142 bool CompilationPolicy::can_be_osr_compiled(methodHandle m, int comp_level) { 143 bool result = false; 144 if (comp_level == CompLevel_all) { 145 if (TieredCompilation) { 146 // enough to be osr compilable at any level for tiered 147 result = !m->is_not_osr_compilable(CompLevel_simple) || !m->is_not_osr_compilable(CompLevel_full_optimization); 148 } else { 149 // must be osr compilable at available level for non-tiered 150 result = !m->is_not_osr_compilable(CompLevel_highest_tier); 151 } 152 } else if (is_compile(comp_level)) { 153 result = !m->is_not_osr_compilable(comp_level); 154 } 155 return (result && can_be_compiled(m, comp_level)); 156 } 157 158 bool CompilationPolicy::is_compilation_enabled() { 159 // NOTE: CompileBroker::should_compile_new_jobs() checks for UseCompiler 160 return !delay_compilation_during_startup() && CompileBroker::should_compile_new_jobs(); 161 } 162 163 #ifndef PRODUCT 164 void CompilationPolicy::print_time() { 165 tty->print_cr ("Accumulated compilationPolicy times:"); 166 tty->print_cr ("---------------------------"); 167 tty->print_cr (" Total: %3.3f sec.", _accumulated_time.seconds()); 168 } 169 170 void NonTieredCompPolicy::trace_osr_completion(nmethod* osr_nm) { 171 if (TraceOnStackReplacement) { 172 if (osr_nm == NULL) tty->print_cr("compilation failed"); 173 else tty->print_cr("nmethod " INTPTR_FORMAT, p2i(osr_nm)); 174 } 175 } 176 #endif // !PRODUCT 177 178 void NonTieredCompPolicy::initialize() { 179 // Setup the compiler thread numbers 180 if (CICompilerCountPerCPU) { 181 // Example: if CICompilerCountPerCPU is true, then we get 182 // max(log2(8)-1,1) = 2 compiler threads on an 8-way machine. 183 // May help big-app startup time. 184 _compiler_count = MAX2(log2_intptr(os::active_processor_count())-1,1); 185 FLAG_SET_ERGO(intx, CICompilerCount, _compiler_count); 186 } else { 187 _compiler_count = CICompilerCount; 188 } 189 } 190 191 // Note: this policy is used ONLY if TieredCompilation is off. 192 // compiler_count() behaves the following way: 193 // - with TIERED build (with both COMPILER1 and COMPILER2 defined) it should return 194 // zero for the c1 compilation levels, hence the particular ordering of the 195 // statements. 196 // - the same should happen when COMPILER2 is defined and COMPILER1 is not 197 // (server build without TIERED defined). 198 // - if only COMPILER1 is defined (client build), zero should be returned for 199 // the c2 level. 200 // - if neither is defined - always return zero. 201 int NonTieredCompPolicy::compiler_count(CompLevel comp_level) { 202 assert(!TieredCompilation, "This policy should not be used with TieredCompilation"); 203 #ifdef COMPILER2 204 if (is_c2_compile(comp_level)) { 205 return _compiler_count; 206 } else { 207 return 0; 208 } 209 #endif 210 211 #ifdef COMPILER1 212 if (is_c1_compile(comp_level)) { 213 return _compiler_count; 214 } else { 215 return 0; 216 } 217 #endif 218 219 return 0; 220 } 221 222 void NonTieredCompPolicy::reset_counter_for_invocation_event(methodHandle m) { 223 // Make sure invocation and backedge counter doesn't overflow again right away 224 // as would be the case for native methods. 225 226 // BUT also make sure the method doesn't look like it was never executed. 227 // Set carry bit and reduce counter's value to min(count, CompileThreshold/2). 228 MethodCounters* mcs = m->method_counters(); 229 assert(mcs != NULL, "MethodCounters cannot be NULL for profiling"); 230 mcs->invocation_counter()->set_carry(); 231 mcs->backedge_counter()->set_carry(); 232 233 assert(!m->was_never_executed(), "don't reset to 0 -- could be mistaken for never-executed"); 234 } 235 236 void NonTieredCompPolicy::reset_counter_for_back_branch_event(methodHandle m) { 237 // Delay next back-branch event but pump up invocation counter to triger 238 // whole method compilation. 239 MethodCounters* mcs = m->method_counters(); 240 assert(mcs != NULL, "MethodCounters cannot be NULL for profiling"); 241 InvocationCounter* i = mcs->invocation_counter(); 242 InvocationCounter* b = mcs->backedge_counter(); 243 244 // Don't set invocation_counter's value too low otherwise the method will 245 // look like immature (ic < ~5300) which prevents the inlining based on 246 // the type profiling. 247 i->set(i->state(), CompileThreshold); 248 // Don't reset counter too low - it is used to check if OSR method is ready. 249 b->set(b->state(), CompileThreshold / 2); 250 } 251 252 // 253 // CounterDecay 254 // 255 // Interates through invocation counters and decrements them. This 256 // is done at each safepoint. 257 // 258 class CounterDecay : public AllStatic { 259 static jlong _last_timestamp; 260 static void do_method(Method* m) { 261 MethodCounters* mcs = m->method_counters(); 262 if (mcs != NULL) { 263 mcs->invocation_counter()->decay(); 264 } 265 } 266 public: 267 static void decay(); 268 static bool is_decay_needed() { 269 return (os::javaTimeMillis() - _last_timestamp) > CounterDecayMinIntervalLength; 270 } 271 }; 272 273 jlong CounterDecay::_last_timestamp = 0; 274 275 void CounterDecay::decay() { 276 _last_timestamp = os::javaTimeMillis(); 277 278 // This operation is going to be performed only at the end of a safepoint 279 // and hence GC's will not be going on, all Java mutators are suspended 280 // at this point and hence SystemDictionary_lock is also not needed. 281 assert(SafepointSynchronize::is_at_safepoint(), "can only be executed at a safepoint"); 282 int nclasses = SystemDictionary::number_of_classes(); 283 double classes_per_tick = nclasses * (CounterDecayMinIntervalLength * 1e-3 / 284 CounterHalfLifeTime); 285 for (int i = 0; i < classes_per_tick; i++) { 286 Klass* k = SystemDictionary::try_get_next_class(); 287 if (k != NULL && k->oop_is_instance()) { 288 InstanceKlass::cast(k)->methods_do(do_method); 289 } 290 } 291 } 292 293 // Called at the end of the safepoint 294 void NonTieredCompPolicy::do_safepoint_work() { 295 if(UseCounterDecay && CounterDecay::is_decay_needed()) { 296 CounterDecay::decay(); 297 } 298 } 299 300 void NonTieredCompPolicy::reprofile(ScopeDesc* trap_scope, bool is_osr) { 301 ScopeDesc* sd = trap_scope; 302 MethodCounters* mcs; 303 InvocationCounter* c; 304 for (; !sd->is_top(); sd = sd->sender()) { 305 mcs = sd->method()->method_counters(); 306 if (mcs != NULL) { 307 // Reset ICs of inlined methods, since they can trigger compilations also. 308 mcs->invocation_counter()->reset(); 309 } 310 } 311 mcs = sd->method()->method_counters(); 312 if (mcs != NULL) { 313 c = mcs->invocation_counter(); 314 if (is_osr) { 315 // It was an OSR method, so bump the count higher. 316 c->set(c->state(), CompileThreshold); 317 } else { 318 c->reset(); 319 } 320 mcs->backedge_counter()->reset(); 321 } 322 } 323 324 // This method can be called by any component of the runtime to notify the policy 325 // that it's recommended to delay the complation of this method. 326 void NonTieredCompPolicy::delay_compilation(Method* method) { 327 MethodCounters* mcs = method->method_counters(); 328 if (mcs != NULL) { 329 mcs->invocation_counter()->decay(); 330 mcs->backedge_counter()->decay(); 331 } 332 } 333 334 void NonTieredCompPolicy::disable_compilation(Method* method) { 335 MethodCounters* mcs = method->method_counters(); 336 if (mcs != NULL) { 337 mcs->invocation_counter()->set_state(InvocationCounter::wait_for_nothing); 338 mcs->backedge_counter()->set_state(InvocationCounter::wait_for_nothing); 339 } 340 } 341 342 CompileTask* NonTieredCompPolicy::select_task(CompileQueue* compile_queue) { 343 return compile_queue->first(); 344 } 345 346 bool NonTieredCompPolicy::is_mature(Method* method) { 347 MethodData* mdo = method->method_data(); 348 assert(mdo != NULL, "Should be"); 349 uint current = mdo->mileage_of(method); 350 uint initial = mdo->creation_mileage(); 351 if (current < initial) 352 return true; // some sort of overflow 353 uint target; 354 if (ProfileMaturityPercentage <= 0) 355 target = (uint) -ProfileMaturityPercentage; // absolute value 356 else 357 target = (uint)( (ProfileMaturityPercentage * CompileThreshold) / 100 ); 358 return (current >= initial + target); 359 } 360 361 nmethod* NonTieredCompPolicy::event(methodHandle method, methodHandle inlinee, int branch_bci, 362 int bci, CompLevel comp_level, nmethod* nm, JavaThread* thread) { 363 assert(comp_level == CompLevel_none, "This should be only called from the interpreter"); 364 NOT_PRODUCT(trace_frequency_counter_overflow(method, branch_bci, bci)); 365 if (JvmtiExport::can_post_interpreter_events() && thread->is_interp_only_mode()) { 366 // If certain JVMTI events (e.g. frame pop event) are requested then the 367 // thread is forced to remain in interpreted code. This is 368 // implemented partly by a check in the run_compiled_code 369 // section of the interpreter whether we should skip running 370 // compiled code, and partly by skipping OSR compiles for 371 // interpreted-only threads. 372 if (bci != InvocationEntryBci) { 373 reset_counter_for_back_branch_event(method); 374 return NULL; 375 } 376 } 377 if (CompileTheWorld || ReplayCompiles) { 378 // Don't trigger other compiles in testing mode 379 if (bci == InvocationEntryBci) { 380 reset_counter_for_invocation_event(method); 381 } else { 382 reset_counter_for_back_branch_event(method); 383 } 384 return NULL; 385 } 386 387 if (bci == InvocationEntryBci) { 388 // when code cache is full, compilation gets switched off, UseCompiler 389 // is set to false 390 if (!method->has_compiled_code() && UseCompiler) { 391 method_invocation_event(method, thread); 392 } else { 393 // Force counter overflow on method entry, even if no compilation 394 // happened. (The method_invocation_event call does this also.) 395 reset_counter_for_invocation_event(method); 396 } 397 // compilation at an invocation overflow no longer goes and retries test for 398 // compiled method. We always run the loser of the race as interpreted. 399 // so return NULL 400 return NULL; 401 } else { 402 // counter overflow in a loop => try to do on-stack-replacement 403 nmethod* osr_nm = method->lookup_osr_nmethod_for(bci, CompLevel_highest_tier, true); 404 NOT_PRODUCT(trace_osr_request(method, osr_nm, bci)); 405 // when code cache is full, we should not compile any more... 406 if (osr_nm == NULL && UseCompiler) { 407 method_back_branch_event(method, bci, thread); 408 osr_nm = method->lookup_osr_nmethod_for(bci, CompLevel_highest_tier, true); 409 } 410 if (osr_nm == NULL) { 411 reset_counter_for_back_branch_event(method); 412 return NULL; 413 } 414 return osr_nm; 415 } 416 return NULL; 417 } 418 419 #ifndef PRODUCT 420 PRAGMA_FORMAT_NONLITERAL_IGNORED_EXTERNAL 421 void NonTieredCompPolicy::trace_frequency_counter_overflow(methodHandle m, int branch_bci, int bci) { 422 if (TraceInvocationCounterOverflow) { 423 MethodCounters* mcs = m->method_counters(); 424 assert(mcs != NULL, "MethodCounters cannot be NULL for profiling"); 425 InvocationCounter* ic = mcs->invocation_counter(); 426 InvocationCounter* bc = mcs->backedge_counter(); 427 ResourceMark rm; 428 const char* msg = 429 bci == InvocationEntryBci 430 ? "comp-policy cntr ovfl @ %d in entry of " 431 : "comp-policy cntr ovfl @ %d in loop of "; 432 PRAGMA_DIAG_PUSH 433 PRAGMA_FORMAT_NONLITERAL_IGNORED_INTERNAL 434 tty->print(msg, bci); 435 PRAGMA_DIAG_POP 436 m->print_value(); 437 tty->cr(); 438 ic->print(); 439 bc->print(); 440 if (ProfileInterpreter) { 441 if (bci != InvocationEntryBci) { 442 MethodData* mdo = m->method_data(); 443 if (mdo != NULL) { 444 int count = mdo->bci_to_data(branch_bci)->as_JumpData()->taken(); 445 tty->print_cr("back branch count = %d", count); 446 } 447 } 448 } 449 } 450 } 451 452 void NonTieredCompPolicy::trace_osr_request(methodHandle method, nmethod* osr, int bci) { 453 if (TraceOnStackReplacement) { 454 ResourceMark rm; 455 tty->print(osr != NULL ? "Reused OSR entry for " : "Requesting OSR entry for "); 456 method->print_short_name(tty); 457 tty->print_cr(" at bci %d", bci); 458 } 459 } 460 #endif // !PRODUCT 461 462 // SimpleCompPolicy - compile current method 463 464 void SimpleCompPolicy::method_invocation_event(methodHandle m, JavaThread* thread) { 465 const int comp_level = CompLevel_highest_tier; 466 const int hot_count = m->invocation_count(); 467 reset_counter_for_invocation_event(m); 468 const char* comment = "count"; 469 470 if (is_compilation_enabled() && can_be_compiled(m, comp_level)) { 471 nmethod* nm = m->code(); 472 if (nm == NULL ) { 473 CompileBroker::compile_method(m, InvocationEntryBci, comp_level, m, hot_count, comment, thread); 474 } 475 } 476 } 477 478 void SimpleCompPolicy::method_back_branch_event(methodHandle m, int bci, JavaThread* thread) { 479 const int comp_level = CompLevel_highest_tier; 480 const int hot_count = m->backedge_count(); 481 const char* comment = "backedge_count"; 482 483 if (is_compilation_enabled() && can_be_osr_compiled(m, comp_level)) { 484 CompileBroker::compile_method(m, bci, comp_level, m, hot_count, comment, thread); 485 NOT_PRODUCT(trace_osr_completion(m->lookup_osr_nmethod_for(bci, comp_level, true));) 486 } 487 } 488 // StackWalkCompPolicy - walk up stack to find a suitable method to compile 489 490 #ifdef COMPILER2 491 const char* StackWalkCompPolicy::_msg = NULL; 492 493 494 // Consider m for compilation 495 void StackWalkCompPolicy::method_invocation_event(methodHandle m, JavaThread* thread) { 496 const int comp_level = CompLevel_highest_tier; 497 const int hot_count = m->invocation_count(); 498 reset_counter_for_invocation_event(m); 499 const char* comment = "count"; 500 501 if (is_compilation_enabled() && m->code() == NULL && can_be_compiled(m, comp_level)) { 502 ResourceMark rm(thread); 503 frame fr = thread->last_frame(); 504 assert(fr.is_interpreted_frame(), "must be interpreted"); 505 assert(fr.interpreter_frame_method() == m(), "bad method"); 506 507 if (TraceCompilationPolicy) { 508 tty->print("method invocation trigger: "); 509 m->print_short_name(tty); 510 tty->print(" ( interpreted " INTPTR_FORMAT ", size=%d ) ", p2i((address)m()), m->code_size()); 511 } 512 RegisterMap reg_map(thread, false); 513 javaVFrame* triggerVF = thread->last_java_vframe(®_map); 514 // triggerVF is the frame that triggered its counter 515 RFrame* first = new InterpretedRFrame(triggerVF->fr(), thread, m); 516 517 if (first->top_method()->code() != NULL) { 518 // called obsolete method/nmethod -- no need to recompile 519 if (TraceCompilationPolicy) tty->print_cr(" --> " INTPTR_FORMAT, p2i(first->top_method()->code())); 520 } else { 521 if (TimeCompilationPolicy) accumulated_time()->start(); 522 GrowableArray<RFrame*>* stack = new GrowableArray<RFrame*>(50); 523 stack->push(first); 524 RFrame* top = findTopInlinableFrame(stack); 525 if (TimeCompilationPolicy) accumulated_time()->stop(); 526 assert(top != NULL, "findTopInlinableFrame returned null"); 527 if (TraceCompilationPolicy) top->print(); 528 CompileBroker::compile_method(top->top_method(), InvocationEntryBci, comp_level, 529 m, hot_count, comment, thread); 530 } 531 } 532 } 533 534 void StackWalkCompPolicy::method_back_branch_event(methodHandle m, int bci, JavaThread* thread) { 535 const int comp_level = CompLevel_highest_tier; 536 const int hot_count = m->backedge_count(); 537 const char* comment = "backedge_count"; 538 539 if (is_compilation_enabled() && can_be_osr_compiled(m, comp_level)) { 540 CompileBroker::compile_method(m, bci, comp_level, m, hot_count, comment, thread); 541 NOT_PRODUCT(trace_osr_completion(m->lookup_osr_nmethod_for(bci, comp_level, true));) 542 } 543 } 544 545 RFrame* StackWalkCompPolicy::findTopInlinableFrame(GrowableArray<RFrame*>* stack) { 546 // go up the stack until finding a frame that (probably) won't be inlined 547 // into its caller 548 RFrame* current = stack->at(0); // current choice for stopping 549 assert( current && !current->is_compiled(), "" ); 550 const char* msg = NULL; 551 552 while (1) { 553 554 // before going up the stack further, check if doing so would get us into 555 // compiled code 556 RFrame* next = senderOf(current, stack); 557 if( !next ) // No next frame up the stack? 558 break; // Then compile with current frame 559 560 methodHandle m = current->top_method(); 561 methodHandle next_m = next->top_method(); 562 563 if (TraceCompilationPolicy && Verbose) { 564 tty->print("[caller: "); 565 next_m->print_short_name(tty); 566 tty->print("] "); 567 } 568 569 if( !Inline ) { // Inlining turned off 570 msg = "Inlining turned off"; 571 break; 572 } 573 if (next_m->is_not_compilable()) { // Did fail to compile this before/ 574 msg = "caller not compilable"; 575 break; 576 } 577 if (next->num() > MaxRecompilationSearchLength) { 578 // don't go up too high when searching for recompilees 579 msg = "don't go up any further: > MaxRecompilationSearchLength"; 580 break; 581 } 582 if (next->distance() > MaxInterpretedSearchLength) { 583 // don't go up too high when searching for recompilees 584 msg = "don't go up any further: next > MaxInterpretedSearchLength"; 585 break; 586 } 587 // Compiled frame above already decided not to inline; 588 // do not recompile him. 589 if (next->is_compiled()) { 590 msg = "not going up into optimized code"; 591 break; 592 } 593 594 // Interpreted frame above us was already compiled. Do not force 595 // a recompile, although if the frame above us runs long enough an 596 // OSR might still happen. 597 if( current->is_interpreted() && next_m->has_compiled_code() ) { 598 msg = "not going up -- already compiled caller"; 599 break; 600 } 601 602 // Compute how frequent this call site is. We have current method 'm'. 603 // We know next method 'next_m' is interpreted. Find the call site and 604 // check the various invocation counts. 605 int invcnt = 0; // Caller counts 606 if (ProfileInterpreter) { 607 invcnt = next_m->interpreter_invocation_count(); 608 } 609 int cnt = 0; // Call site counts 610 if (ProfileInterpreter && next_m->method_data() != NULL) { 611 ResourceMark rm; 612 int bci = next->top_vframe()->bci(); 613 ProfileData* data = next_m->method_data()->bci_to_data(bci); 614 if (data != NULL && data->is_CounterData()) 615 cnt = data->as_CounterData()->count(); 616 } 617 618 // Caller counts / call-site counts; i.e. is this call site 619 // a hot call site for method next_m? 620 int freq = (invcnt) ? cnt/invcnt : cnt; 621 622 // Check size and frequency limits 623 if ((msg = shouldInline(m, freq, cnt)) != NULL) { 624 break; 625 } 626 // Check inlining negative tests 627 if ((msg = shouldNotInline(m)) != NULL) { 628 break; 629 } 630 631 632 // If the caller method is too big or something then we do not want to 633 // compile it just to inline a method 634 if (!can_be_compiled(next_m, CompLevel_any)) { 635 msg = "caller cannot be compiled"; 636 break; 637 } 638 639 if( next_m->name() == vmSymbols::class_initializer_name() ) { 640 msg = "do not compile class initializer (OSR ok)"; 641 break; 642 } 643 644 if (TraceCompilationPolicy && Verbose) { 645 tty->print("\n\t check caller: "); 646 next_m->print_short_name(tty); 647 tty->print(" ( interpreted " INTPTR_FORMAT ", size=%d ) ", p2i((address)next_m()), next_m->code_size()); 648 } 649 650 current = next; 651 } 652 653 assert( !current || !current->is_compiled(), "" ); 654 655 if (TraceCompilationPolicy && msg) tty->print("(%s)\n", msg); 656 657 return current; 658 } 659 660 RFrame* StackWalkCompPolicy::senderOf(RFrame* rf, GrowableArray<RFrame*>* stack) { 661 RFrame* sender = rf->caller(); 662 if (sender && sender->num() == stack->length()) stack->push(sender); 663 return sender; 664 } 665 666 667 const char* StackWalkCompPolicy::shouldInline(methodHandle m, float freq, int cnt) { 668 // Allows targeted inlining 669 // positive filter: should send be inlined? returns NULL (--> yes) 670 // or rejection msg 671 int max_size = MaxInlineSize; 672 int cost = m->code_size(); 673 674 // Check for too many throws (and not too huge) 675 if (m->interpreter_throwout_count() > InlineThrowCount && cost < InlineThrowMaxSize ) { 676 return NULL; 677 } 678 679 // bump the max size if the call is frequent 680 if ((freq >= InlineFrequencyRatio) || (cnt >= InlineFrequencyCount)) { 681 if (TraceFrequencyInlining) { 682 tty->print("(Inlined frequent method)\n"); 683 m->print(); 684 } 685 max_size = FreqInlineSize; 686 } 687 if (cost > max_size) { 688 return (_msg = "too big"); 689 } 690 return NULL; 691 } 692 693 694 const char* StackWalkCompPolicy::shouldNotInline(methodHandle m) { 695 // negative filter: should send NOT be inlined? returns NULL (--> inline) or rejection msg 696 if (m->is_abstract()) return (_msg = "abstract method"); 697 // note: we allow ik->is_abstract() 698 if (!m->method_holder()->is_initialized()) return (_msg = "method holder not initialized"); 699 if (m->is_native()) return (_msg = "native method"); 700 nmethod* m_code = m->code(); 701 if (m_code != NULL && m_code->code_size() > InlineSmallCode) 702 return (_msg = "already compiled into a big method"); 703 704 // use frequency-based objections only for non-trivial methods 705 if (m->code_size() <= MaxTrivialSize) return NULL; 706 if (UseInterpreter) { // don't use counts with -Xcomp 707 if ((m->code() == NULL) && m->was_never_executed()) return (_msg = "never executed"); 708 if (!m->was_executed_more_than(MIN2(MinInliningThreshold, CompileThreshold >> 1))) return (_msg = "executed < MinInliningThreshold times"); 709 } 710 if (Method::has_unloaded_classes_in_signature(m, JavaThread::current())) return (_msg = "unloaded signature classes"); 711 712 return NULL; 713 } 714 715 716 717 #endif // COMPILER2