Tue, 09 Apr 2013 17:17:41 -0400
8010862: The Method counter fields used for profiling can be allocated lazily.
Summary: Allocate the method's profiling related metadata until they are needed.
Reviewed-by: coleenp, roland
1 /*
2 * Copyright (c) 2000, 2013, 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.
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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23 */
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"
49 CompilationPolicy* CompilationPolicy::_policy;
50 elapsedTimer CompilationPolicy::_accumulated_time;
51 bool CompilationPolicy::_in_vm_startup;
53 // Determine compilation policy based on command line argument
54 void compilationPolicy_init() {
55 CompilationPolicy::set_in_vm_startup(DelayCompilationDuringStartup);
57 switch(CompilationPolicyChoice) {
58 case 0:
59 CompilationPolicy::set_policy(new SimpleCompPolicy());
60 break;
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 }
89 void CompilationPolicy::completed_vm_startup() {
90 if (TraceCompilationPolicy) {
91 tty->print("CompilationPolicy: completed vm startup.\n");
92 }
93 _in_vm_startup = false;
94 }
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;
103 if (m->has_compiled_code()) return false; // already compiled
104 if (!can_be_compiled(m, comp_level)) return false;
106 return !UseInterpreter || // must compile all methods
107 (UseCompiler && AlwaysCompileLoopMethods && m->has_loops() && CompileBroker::should_compile_new_jobs()); // eagerly compile loop methods
108 }
110 // Returns true if m is allowed to be compiled
111 bool CompilationPolicy::can_be_compiled(methodHandle m, int comp_level) {
112 if (m->is_abstract()) return false;
113 if (DontCompileHugeMethods && m->code_size() > HugeMethodLimit) return false;
115 // Math intrinsics should never be compiled as this can lead to
116 // monotonicity problems because the interpreter will prefer the
117 // compiled code to the intrinsic version. This can't happen in
118 // production because the invocation counter can't be incremented
119 // but we shouldn't expose the system to this problem in testing
120 // modes.
121 if (!AbstractInterpreter::can_be_compiled(m)) {
122 return false;
123 }
124 if (comp_level == CompLevel_all) {
125 return !m->is_not_compilable(CompLevel_simple) && !m->is_not_compilable(CompLevel_full_optimization);
126 } else {
127 return !m->is_not_compilable(comp_level);
128 }
129 }
131 bool CompilationPolicy::is_compilation_enabled() {
132 // NOTE: CompileBroker::should_compile_new_jobs() checks for UseCompiler
133 return !delay_compilation_during_startup() && CompileBroker::should_compile_new_jobs();
134 }
136 #ifndef PRODUCT
137 void CompilationPolicy::print_time() {
138 tty->print_cr ("Accumulated compilationPolicy times:");
139 tty->print_cr ("---------------------------");
140 tty->print_cr (" Total: %3.3f sec.", _accumulated_time.seconds());
141 }
143 void NonTieredCompPolicy::trace_osr_completion(nmethod* osr_nm) {
144 if (TraceOnStackReplacement) {
145 if (osr_nm == NULL) tty->print_cr("compilation failed");
146 else tty->print_cr("nmethod " INTPTR_FORMAT, osr_nm);
147 }
148 }
149 #endif // !PRODUCT
151 void NonTieredCompPolicy::initialize() {
152 // Setup the compiler thread numbers
153 if (CICompilerCountPerCPU) {
154 // Example: if CICompilerCountPerCPU is true, then we get
155 // max(log2(8)-1,1) = 2 compiler threads on an 8-way machine.
156 // May help big-app startup time.
157 _compiler_count = MAX2(log2_intptr(os::active_processor_count())-1,1);
158 } else {
159 _compiler_count = CICompilerCount;
160 }
161 }
163 // Note: this policy is used ONLY if TieredCompilation is off.
164 // compiler_count() behaves the following way:
165 // - with TIERED build (with both COMPILER1 and COMPILER2 defined) it should return
166 // zero for the c1 compilation levels, hence the particular ordering of the
167 // statements.
168 // - the same should happen when COMPILER2 is defined and COMPILER1 is not
169 // (server build without TIERED defined).
170 // - if only COMPILER1 is defined (client build), zero should be returned for
171 // the c2 level.
172 // - if neither is defined - always return zero.
173 int NonTieredCompPolicy::compiler_count(CompLevel comp_level) {
174 assert(!TieredCompilation, "This policy should not be used with TieredCompilation");
175 #ifdef COMPILER2
176 if (is_c2_compile(comp_level)) {
177 return _compiler_count;
178 } else {
179 return 0;
180 }
181 #endif
183 #ifdef COMPILER1
184 if (is_c1_compile(comp_level)) {
185 return _compiler_count;
186 } else {
187 return 0;
188 }
189 #endif
191 return 0;
192 }
194 void NonTieredCompPolicy::reset_counter_for_invocation_event(methodHandle m) {
195 // Make sure invocation and backedge counter doesn't overflow again right away
196 // as would be the case for native methods.
198 // BUT also make sure the method doesn't look like it was never executed.
199 // Set carry bit and reduce counter's value to min(count, CompileThreshold/2).
200 MethodCounters* mcs = m->method_counters();
201 assert(mcs != NULL, "MethodCounters cannot be NULL for profiling");
202 mcs->invocation_counter()->set_carry();
203 mcs->backedge_counter()->set_carry();
205 assert(!m->was_never_executed(), "don't reset to 0 -- could be mistaken for never-executed");
206 }
208 void NonTieredCompPolicy::reset_counter_for_back_branch_event(methodHandle m) {
209 // Delay next back-branch event but pump up invocation counter to triger
210 // whole method compilation.
211 MethodCounters* mcs = m->method_counters();
212 assert(mcs != NULL, "MethodCounters cannot be NULL for profiling");
213 InvocationCounter* i = mcs->invocation_counter();
214 InvocationCounter* b = mcs->backedge_counter();
216 // Don't set invocation_counter's value too low otherwise the method will
217 // look like immature (ic < ~5300) which prevents the inlining based on
218 // the type profiling.
219 i->set(i->state(), CompileThreshold);
220 // Don't reset counter too low - it is used to check if OSR method is ready.
221 b->set(b->state(), CompileThreshold / 2);
222 }
224 //
225 // CounterDecay
226 //
227 // Interates through invocation counters and decrements them. This
228 // is done at each safepoint.
229 //
230 class CounterDecay : public AllStatic {
231 static jlong _last_timestamp;
232 static void do_method(Method* m) {
233 MethodCounters* mcs = m->method_counters();
234 if (mcs != NULL) {
235 mcs->invocation_counter()->decay();
236 }
237 }
238 public:
239 static void decay();
240 static bool is_decay_needed() {
241 return (os::javaTimeMillis() - _last_timestamp) > CounterDecayMinIntervalLength;
242 }
243 };
245 jlong CounterDecay::_last_timestamp = 0;
247 void CounterDecay::decay() {
248 _last_timestamp = os::javaTimeMillis();
250 // This operation is going to be performed only at the end of a safepoint
251 // and hence GC's will not be going on, all Java mutators are suspended
252 // at this point and hence SystemDictionary_lock is also not needed.
253 assert(SafepointSynchronize::is_at_safepoint(), "can only be executed at a safepoint");
254 int nclasses = SystemDictionary::number_of_classes();
255 double classes_per_tick = nclasses * (CounterDecayMinIntervalLength * 1e-3 /
256 CounterHalfLifeTime);
257 for (int i = 0; i < classes_per_tick; i++) {
258 Klass* k = SystemDictionary::try_get_next_class();
259 if (k != NULL && k->oop_is_instance()) {
260 InstanceKlass::cast(k)->methods_do(do_method);
261 }
262 }
263 }
265 // Called at the end of the safepoint
266 void NonTieredCompPolicy::do_safepoint_work() {
267 if(UseCounterDecay && CounterDecay::is_decay_needed()) {
268 CounterDecay::decay();
269 }
270 }
272 void NonTieredCompPolicy::reprofile(ScopeDesc* trap_scope, bool is_osr) {
273 ScopeDesc* sd = trap_scope;
274 MethodCounters* mcs;
275 InvocationCounter* c;
276 for (; !sd->is_top(); sd = sd->sender()) {
277 mcs = sd->method()->method_counters();
278 if (mcs != NULL) {
279 // Reset ICs of inlined methods, since they can trigger compilations also.
280 mcs->invocation_counter()->reset();
281 }
282 }
283 mcs = sd->method()->method_counters();
284 if (mcs != NULL) {
285 c = mcs->invocation_counter();
286 if (is_osr) {
287 // It was an OSR method, so bump the count higher.
288 c->set(c->state(), CompileThreshold);
289 } else {
290 c->reset();
291 }
292 mcs->backedge_counter()->reset();
293 }
294 }
296 // This method can be called by any component of the runtime to notify the policy
297 // that it's recommended to delay the complation of this method.
298 void NonTieredCompPolicy::delay_compilation(Method* method) {
299 MethodCounters* mcs = method->method_counters();
300 assert(mcs != NULL, "MethodCounters cannot be NULL");
301 mcs->invocation_counter()->decay();
302 mcs->backedge_counter()->decay();
303 }
305 void NonTieredCompPolicy::disable_compilation(Method* method) {
306 MethodCounters* mcs = method->method_counters();
307 if (mcs != NULL) {
308 mcs->invocation_counter()->set_state(InvocationCounter::wait_for_nothing);
309 mcs->backedge_counter()->set_state(InvocationCounter::wait_for_nothing);
310 }
311 }
313 CompileTask* NonTieredCompPolicy::select_task(CompileQueue* compile_queue) {
314 return compile_queue->first();
315 }
317 bool NonTieredCompPolicy::is_mature(Method* method) {
318 MethodData* mdo = method->method_data();
319 assert(mdo != NULL, "Should be");
320 uint current = mdo->mileage_of(method);
321 uint initial = mdo->creation_mileage();
322 if (current < initial)
323 return true; // some sort of overflow
324 uint target;
325 if (ProfileMaturityPercentage <= 0)
326 target = (uint) -ProfileMaturityPercentage; // absolute value
327 else
328 target = (uint)( (ProfileMaturityPercentage * CompileThreshold) / 100 );
329 return (current >= initial + target);
330 }
332 nmethod* NonTieredCompPolicy::event(methodHandle method, methodHandle inlinee, int branch_bci,
333 int bci, CompLevel comp_level, nmethod* nm, JavaThread* thread) {
334 assert(comp_level == CompLevel_none, "This should be only called from the interpreter");
335 NOT_PRODUCT(trace_frequency_counter_overflow(method, branch_bci, bci));
336 if (JvmtiExport::can_post_interpreter_events() && thread->is_interp_only_mode()) {
337 // If certain JVMTI events (e.g. frame pop event) are requested then the
338 // thread is forced to remain in interpreted code. This is
339 // implemented partly by a check in the run_compiled_code
340 // section of the interpreter whether we should skip running
341 // compiled code, and partly by skipping OSR compiles for
342 // interpreted-only threads.
343 if (bci != InvocationEntryBci) {
344 reset_counter_for_back_branch_event(method);
345 return NULL;
346 }
347 }
348 if (CompileTheWorld || ReplayCompiles) {
349 // Don't trigger other compiles in testing mode
350 if (bci == InvocationEntryBci) {
351 reset_counter_for_invocation_event(method);
352 } else {
353 reset_counter_for_back_branch_event(method);
354 }
355 return NULL;
356 }
358 if (bci == InvocationEntryBci) {
359 // when code cache is full, compilation gets switched off, UseCompiler
360 // is set to false
361 if (!method->has_compiled_code() && UseCompiler) {
362 method_invocation_event(method, thread);
363 } else {
364 // Force counter overflow on method entry, even if no compilation
365 // happened. (The method_invocation_event call does this also.)
366 reset_counter_for_invocation_event(method);
367 }
368 // compilation at an invocation overflow no longer goes and retries test for
369 // compiled method. We always run the loser of the race as interpreted.
370 // so return NULL
371 return NULL;
372 } else {
373 // counter overflow in a loop => try to do on-stack-replacement
374 nmethod* osr_nm = method->lookup_osr_nmethod_for(bci, CompLevel_highest_tier, true);
375 NOT_PRODUCT(trace_osr_request(method, osr_nm, bci));
376 // when code cache is full, we should not compile any more...
377 if (osr_nm == NULL && UseCompiler) {
378 method_back_branch_event(method, bci, thread);
379 osr_nm = method->lookup_osr_nmethod_for(bci, CompLevel_highest_tier, true);
380 }
381 if (osr_nm == NULL) {
382 reset_counter_for_back_branch_event(method);
383 return NULL;
384 }
385 return osr_nm;
386 }
387 return NULL;
388 }
390 #ifndef PRODUCT
391 void NonTieredCompPolicy::trace_frequency_counter_overflow(methodHandle m, int branch_bci, int bci) {
392 if (TraceInvocationCounterOverflow) {
393 MethodCounters* mcs = m->method_counters();
394 assert(mcs != NULL, "MethodCounters cannot be NULL for profiling");
395 InvocationCounter* ic = mcs->invocation_counter();
396 InvocationCounter* bc = mcs->backedge_counter();
397 ResourceMark rm;
398 const char* msg =
399 bci == InvocationEntryBci
400 ? "comp-policy cntr ovfl @ %d in entry of "
401 : "comp-policy cntr ovfl @ %d in loop of ";
402 tty->print(msg, bci);
403 m->print_value();
404 tty->cr();
405 ic->print();
406 bc->print();
407 if (ProfileInterpreter) {
408 if (bci != InvocationEntryBci) {
409 MethodData* mdo = m->method_data();
410 if (mdo != NULL) {
411 int count = mdo->bci_to_data(branch_bci)->as_JumpData()->taken();
412 tty->print_cr("back branch count = %d", count);
413 }
414 }
415 }
416 }
417 }
419 void NonTieredCompPolicy::trace_osr_request(methodHandle method, nmethod* osr, int bci) {
420 if (TraceOnStackReplacement) {
421 ResourceMark rm;
422 tty->print(osr != NULL ? "Reused OSR entry for " : "Requesting OSR entry for ");
423 method->print_short_name(tty);
424 tty->print_cr(" at bci %d", bci);
425 }
426 }
427 #endif // !PRODUCT
429 // SimpleCompPolicy - compile current method
431 void SimpleCompPolicy::method_invocation_event(methodHandle m, JavaThread* thread) {
432 const int comp_level = CompLevel_highest_tier;
433 const int hot_count = m->invocation_count();
434 reset_counter_for_invocation_event(m);
435 const char* comment = "count";
437 if (is_compilation_enabled() && can_be_compiled(m)) {
438 nmethod* nm = m->code();
439 if (nm == NULL ) {
440 CompileBroker::compile_method(m, InvocationEntryBci, comp_level, m, hot_count, comment, thread);
441 }
442 }
443 }
445 void SimpleCompPolicy::method_back_branch_event(methodHandle m, int bci, JavaThread* thread) {
446 const int comp_level = CompLevel_highest_tier;
447 const int hot_count = m->backedge_count();
448 const char* comment = "backedge_count";
450 if (is_compilation_enabled() && !m->is_not_osr_compilable(comp_level) && can_be_compiled(m)) {
451 CompileBroker::compile_method(m, bci, comp_level, m, hot_count, comment, thread);
452 NOT_PRODUCT(trace_osr_completion(m->lookup_osr_nmethod_for(bci, comp_level, true));)
453 }
454 }
455 // StackWalkCompPolicy - walk up stack to find a suitable method to compile
457 #ifdef COMPILER2
458 const char* StackWalkCompPolicy::_msg = NULL;
461 // Consider m for compilation
462 void StackWalkCompPolicy::method_invocation_event(methodHandle m, JavaThread* thread) {
463 const int comp_level = CompLevel_highest_tier;
464 const int hot_count = m->invocation_count();
465 reset_counter_for_invocation_event(m);
466 const char* comment = "count";
468 if (is_compilation_enabled() && m->code() == NULL && can_be_compiled(m)) {
469 ResourceMark rm(thread);
470 frame fr = thread->last_frame();
471 assert(fr.is_interpreted_frame(), "must be interpreted");
472 assert(fr.interpreter_frame_method() == m(), "bad method");
474 if (TraceCompilationPolicy) {
475 tty->print("method invocation trigger: ");
476 m->print_short_name(tty);
477 tty->print(" ( interpreted " INTPTR_FORMAT ", size=%d ) ", (address)m(), m->code_size());
478 }
479 RegisterMap reg_map(thread, false);
480 javaVFrame* triggerVF = thread->last_java_vframe(®_map);
481 // triggerVF is the frame that triggered its counter
482 RFrame* first = new InterpretedRFrame(triggerVF->fr(), thread, m);
484 if (first->top_method()->code() != NULL) {
485 // called obsolete method/nmethod -- no need to recompile
486 if (TraceCompilationPolicy) tty->print_cr(" --> " INTPTR_FORMAT, first->top_method()->code());
487 } else {
488 if (TimeCompilationPolicy) accumulated_time()->start();
489 GrowableArray<RFrame*>* stack = new GrowableArray<RFrame*>(50);
490 stack->push(first);
491 RFrame* top = findTopInlinableFrame(stack);
492 if (TimeCompilationPolicy) accumulated_time()->stop();
493 assert(top != NULL, "findTopInlinableFrame returned null");
494 if (TraceCompilationPolicy) top->print();
495 CompileBroker::compile_method(top->top_method(), InvocationEntryBci, comp_level,
496 m, hot_count, comment, thread);
497 }
498 }
499 }
501 void StackWalkCompPolicy::method_back_branch_event(methodHandle m, int bci, JavaThread* thread) {
502 const int comp_level = CompLevel_highest_tier;
503 const int hot_count = m->backedge_count();
504 const char* comment = "backedge_count";
506 if (is_compilation_enabled() && !m->is_not_osr_compilable(comp_level) && can_be_compiled(m)) {
507 CompileBroker::compile_method(m, bci, comp_level, m, hot_count, comment, thread);
508 NOT_PRODUCT(trace_osr_completion(m->lookup_osr_nmethod_for(bci, comp_level, true));)
509 }
510 }
512 RFrame* StackWalkCompPolicy::findTopInlinableFrame(GrowableArray<RFrame*>* stack) {
513 // go up the stack until finding a frame that (probably) won't be inlined
514 // into its caller
515 RFrame* current = stack->at(0); // current choice for stopping
516 assert( current && !current->is_compiled(), "" );
517 const char* msg = NULL;
519 while (1) {
521 // before going up the stack further, check if doing so would get us into
522 // compiled code
523 RFrame* next = senderOf(current, stack);
524 if( !next ) // No next frame up the stack?
525 break; // Then compile with current frame
527 methodHandle m = current->top_method();
528 methodHandle next_m = next->top_method();
530 if (TraceCompilationPolicy && Verbose) {
531 tty->print("[caller: ");
532 next_m->print_short_name(tty);
533 tty->print("] ");
534 }
536 if( !Inline ) { // Inlining turned off
537 msg = "Inlining turned off";
538 break;
539 }
540 if (next_m->is_not_compilable()) { // Did fail to compile this before/
541 msg = "caller not compilable";
542 break;
543 }
544 if (next->num() > MaxRecompilationSearchLength) {
545 // don't go up too high when searching for recompilees
546 msg = "don't go up any further: > MaxRecompilationSearchLength";
547 break;
548 }
549 if (next->distance() > MaxInterpretedSearchLength) {
550 // don't go up too high when searching for recompilees
551 msg = "don't go up any further: next > MaxInterpretedSearchLength";
552 break;
553 }
554 // Compiled frame above already decided not to inline;
555 // do not recompile him.
556 if (next->is_compiled()) {
557 msg = "not going up into optimized code";
558 break;
559 }
561 // Interpreted frame above us was already compiled. Do not force
562 // a recompile, although if the frame above us runs long enough an
563 // OSR might still happen.
564 if( current->is_interpreted() && next_m->has_compiled_code() ) {
565 msg = "not going up -- already compiled caller";
566 break;
567 }
569 // Compute how frequent this call site is. We have current method 'm'.
570 // We know next method 'next_m' is interpreted. Find the call site and
571 // check the various invocation counts.
572 int invcnt = 0; // Caller counts
573 if (ProfileInterpreter) {
574 invcnt = next_m->interpreter_invocation_count();
575 }
576 int cnt = 0; // Call site counts
577 if (ProfileInterpreter && next_m->method_data() != NULL) {
578 ResourceMark rm;
579 int bci = next->top_vframe()->bci();
580 ProfileData* data = next_m->method_data()->bci_to_data(bci);
581 if (data != NULL && data->is_CounterData())
582 cnt = data->as_CounterData()->count();
583 }
585 // Caller counts / call-site counts; i.e. is this call site
586 // a hot call site for method next_m?
587 int freq = (invcnt) ? cnt/invcnt : cnt;
589 // Check size and frequency limits
590 if ((msg = shouldInline(m, freq, cnt)) != NULL) {
591 break;
592 }
593 // Check inlining negative tests
594 if ((msg = shouldNotInline(m)) != NULL) {
595 break;
596 }
599 // If the caller method is too big or something then we do not want to
600 // compile it just to inline a method
601 if (!can_be_compiled(next_m)) {
602 msg = "caller cannot be compiled";
603 break;
604 }
606 if( next_m->name() == vmSymbols::class_initializer_name() ) {
607 msg = "do not compile class initializer (OSR ok)";
608 break;
609 }
611 if (TraceCompilationPolicy && Verbose) {
612 tty->print("\n\t check caller: ");
613 next_m->print_short_name(tty);
614 tty->print(" ( interpreted " INTPTR_FORMAT ", size=%d ) ", (address)next_m(), next_m->code_size());
615 }
617 current = next;
618 }
620 assert( !current || !current->is_compiled(), "" );
622 if (TraceCompilationPolicy && msg) tty->print("(%s)\n", msg);
624 return current;
625 }
627 RFrame* StackWalkCompPolicy::senderOf(RFrame* rf, GrowableArray<RFrame*>* stack) {
628 RFrame* sender = rf->caller();
629 if (sender && sender->num() == stack->length()) stack->push(sender);
630 return sender;
631 }
634 const char* StackWalkCompPolicy::shouldInline(methodHandle m, float freq, int cnt) {
635 // Allows targeted inlining
636 // positive filter: should send be inlined? returns NULL (--> yes)
637 // or rejection msg
638 int max_size = MaxInlineSize;
639 int cost = m->code_size();
641 // Check for too many throws (and not too huge)
642 if (m->interpreter_throwout_count() > InlineThrowCount && cost < InlineThrowMaxSize ) {
643 return NULL;
644 }
646 // bump the max size if the call is frequent
647 if ((freq >= InlineFrequencyRatio) || (cnt >= InlineFrequencyCount)) {
648 if (TraceFrequencyInlining) {
649 tty->print("(Inlined frequent method)\n");
650 m->print();
651 }
652 max_size = FreqInlineSize;
653 }
654 if (cost > max_size) {
655 return (_msg = "too big");
656 }
657 return NULL;
658 }
661 const char* StackWalkCompPolicy::shouldNotInline(methodHandle m) {
662 // negative filter: should send NOT be inlined? returns NULL (--> inline) or rejection msg
663 if (m->is_abstract()) return (_msg = "abstract method");
664 // note: we allow ik->is_abstract()
665 if (!m->method_holder()->is_initialized()) return (_msg = "method holder not initialized");
666 if (m->is_native()) return (_msg = "native method");
667 nmethod* m_code = m->code();
668 if (m_code != NULL && m_code->code_size() > InlineSmallCode)
669 return (_msg = "already compiled into a big method");
671 // use frequency-based objections only for non-trivial methods
672 if (m->code_size() <= MaxTrivialSize) return NULL;
673 if (UseInterpreter) { // don't use counts with -Xcomp
674 if ((m->code() == NULL) && m->was_never_executed()) return (_msg = "never executed");
675 if (!m->was_executed_more_than(MIN2(MinInliningThreshold, CompileThreshold >> 1))) return (_msg = "executed < MinInliningThreshold times");
676 }
677 if (Method::has_unloaded_classes_in_signature(m, JavaThread::current())) return (_msg = "unloaded signature classes");
679 return NULL;
680 }
684 #endif // COMPILER2