Mercurial > hg > truffle
annotate src/share/vm/runtime/compilationPolicy.cpp @ 4107:cd00eaeebef6
7117389: Add a framework for vendor-specific command line switch extensions to Hotspot
Summary: Add a file, globals_ext.hpp, containing a null interface, to be replaced by a vendor in altsrc as needed.
Reviewed-by: coleenp, kamg, dholmes, johnc, jrose
author | phh |
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date | Mon, 05 Dec 2011 12:50:00 -0500 |
parents | 2c359f27615c |
children | 04b9a2566eec 20334ed5ed3c |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 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/methodDataOop.hpp" | |
32 #include "oops/methodOop.hpp" | |
33 #include "oops/oop.inline.hpp" | |
34 #include "prims/nativeLookup.hpp" | |
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35 #include "runtime/advancedThresholdPolicy.hpp" |
1972 | 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" | |
0 | 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; | |
1783 | 69 case 2: |
70 #ifdef TIERED | |
71 CompilationPolicy::set_policy(new SimpleThresholdPolicy()); | |
72 #else | |
73 Unimplemented(); | |
74 #endif | |
75 break; | |
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76 case 3: |
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77 #ifdef TIERED |
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78 CompilationPolicy::set_policy(new AdvancedThresholdPolicy()); |
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79 #else |
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80 Unimplemented(); |
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81 #endif |
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82 break; |
0 | 83 default: |
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84 fatal("CompilationPolicyChoice must be in the range: [0-3]"); |
0 | 85 } |
1783 | 86 CompilationPolicy::policy()->initialize(); |
0 | 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. | |
1783 | 99 bool CompilationPolicy::must_be_compiled(methodHandle m, int comp_level) { |
0 | 100 if (m->has_compiled_code()) return false; // already compiled |
1783 | 101 if (!can_be_compiled(m, comp_level)) return false; |
0 | 102 |
103 return !UseInterpreter || // must compile all methods | |
1202 | 104 (UseCompiler && AlwaysCompileLoopMethods && m->has_loops() && CompileBroker::should_compile_new_jobs()); // eagerly compile loop methods |
0 | 105 } |
106 | |
107 // Returns true if m is allowed to be compiled | |
1783 | 108 bool CompilationPolicy::can_be_compiled(methodHandle m, int comp_level) { |
0 | 109 if (m->is_abstract()) return false; |
110 if (DontCompileHugeMethods && m->code_size() > HugeMethodLimit) return false; | |
111 | |
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112 // Math intrinsics should never be compiled as this can lead to |
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113 // monotonicity problems because the interpreter will prefer the |
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114 // compiled code to the intrinsic version. This can't happen in |
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115 // production because the invocation counter can't be incremented |
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116 // but we shouldn't expose the system to this problem in testing |
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117 // modes. |
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118 if (!AbstractInterpreter::can_be_compiled(m)) { |
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119 return false; |
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120 } |
1783 | 121 if (comp_level == CompLevel_all) { |
122 return !m->is_not_compilable(CompLevel_simple) && !m->is_not_compilable(CompLevel_full_optimization); | |
123 } else { | |
124 return !m->is_not_compilable(comp_level); | |
125 } | |
126 } | |
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127 |
1783 | 128 bool CompilationPolicy::is_compilation_enabled() { |
129 // NOTE: CompileBroker::should_compile_new_jobs() checks for UseCompiler | |
130 return !delay_compilation_during_startup() && CompileBroker::should_compile_new_jobs(); | |
0 | 131 } |
132 | |
133 #ifndef PRODUCT | |
134 void CompilationPolicy::print_time() { | |
135 tty->print_cr ("Accumulated compilationPolicy times:"); | |
136 tty->print_cr ("---------------------------"); | |
137 tty->print_cr (" Total: %3.3f sec.", _accumulated_time.seconds()); | |
138 } | |
139 | |
1783 | 140 void NonTieredCompPolicy::trace_osr_completion(nmethod* osr_nm) { |
0 | 141 if (TraceOnStackReplacement) { |
142 if (osr_nm == NULL) tty->print_cr("compilation failed"); | |
143 else tty->print_cr("nmethod " INTPTR_FORMAT, osr_nm); | |
144 } | |
145 } | |
146 #endif // !PRODUCT | |
147 | |
1783 | 148 void NonTieredCompPolicy::initialize() { |
149 // Setup the compiler thread numbers | |
150 if (CICompilerCountPerCPU) { | |
151 // Example: if CICompilerCountPerCPU is true, then we get | |
152 // max(log2(8)-1,1) = 2 compiler threads on an 8-way machine. | |
153 // May help big-app startup time. | |
154 _compiler_count = MAX2(log2_intptr(os::active_processor_count())-1,1); | |
155 } else { | |
156 _compiler_count = CICompilerCount; | |
157 } | |
158 } | |
159 | |
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160 // Note: this policy is used ONLY if TieredCompilation is off. |
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161 // compiler_count() behaves the following way: |
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162 // - with TIERED build (with both COMPILER1 and COMPILER2 defined) it should return |
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163 // zero for the c1 compilation levels, hence the particular ordering of the |
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164 // statements. |
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165 // - the same should happen when COMPILER2 is defined and COMPILER1 is not |
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166 // (server build without TIERED defined). |
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167 // - if only COMPILER1 is defined (client build), zero should be returned for |
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168 // the c2 level. |
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169 // - if neither is defined - always return zero. |
1783 | 170 int NonTieredCompPolicy::compiler_count(CompLevel comp_level) { |
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171 assert(!TieredCompilation, "This policy should not be used with TieredCompilation"); |
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172 #ifdef COMPILER2 |
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173 if (is_c2_compile(comp_level)) { |
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174 return _compiler_count; |
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175 } else { |
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176 return 0; |
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177 } |
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178 #endif |
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179 |
1783 | 180 #ifdef COMPILER1 |
181 if (is_c1_compile(comp_level)) { | |
182 return _compiler_count; | |
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183 } else { |
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184 return 0; |
1783 | 185 } |
186 #endif | |
187 | |
188 return 0; | |
189 } | |
190 | |
191 void NonTieredCompPolicy::reset_counter_for_invocation_event(methodHandle m) { | |
0 | 192 // Make sure invocation and backedge counter doesn't overflow again right away |
193 // as would be the case for native methods. | |
194 | |
195 // BUT also make sure the method doesn't look like it was never executed. | |
196 // Set carry bit and reduce counter's value to min(count, CompileThreshold/2). | |
197 m->invocation_counter()->set_carry(); | |
198 m->backedge_counter()->set_carry(); | |
199 | |
200 assert(!m->was_never_executed(), "don't reset to 0 -- could be mistaken for never-executed"); | |
201 } | |
202 | |
1783 | 203 void NonTieredCompPolicy::reset_counter_for_back_branch_event(methodHandle m) { |
0 | 204 // Delay next back-branch event but pump up invocation counter to triger |
205 // whole method compilation. | |
206 InvocationCounter* i = m->invocation_counter(); | |
207 InvocationCounter* b = m->backedge_counter(); | |
208 | |
209 // Don't set invocation_counter's value too low otherwise the method will | |
210 // look like immature (ic < ~5300) which prevents the inlining based on | |
211 // the type profiling. | |
212 i->set(i->state(), CompileThreshold); | |
213 // Don't reset counter too low - it is used to check if OSR method is ready. | |
214 b->set(b->state(), CompileThreshold / 2); | |
215 } | |
216 | |
1783 | 217 // |
218 // CounterDecay | |
219 // | |
220 // Interates through invocation counters and decrements them. This | |
221 // is done at each safepoint. | |
222 // | |
223 class CounterDecay : public AllStatic { | |
224 static jlong _last_timestamp; | |
225 static void do_method(methodOop m) { | |
226 m->invocation_counter()->decay(); | |
227 } | |
228 public: | |
229 static void decay(); | |
230 static bool is_decay_needed() { | |
231 return (os::javaTimeMillis() - _last_timestamp) > CounterDecayMinIntervalLength; | |
232 } | |
233 }; | |
234 | |
235 jlong CounterDecay::_last_timestamp = 0; | |
236 | |
237 void CounterDecay::decay() { | |
238 _last_timestamp = os::javaTimeMillis(); | |
239 | |
240 // This operation is going to be performed only at the end of a safepoint | |
241 // and hence GC's will not be going on, all Java mutators are suspended | |
242 // at this point and hence SystemDictionary_lock is also not needed. | |
243 assert(SafepointSynchronize::is_at_safepoint(), "can only be executed at a safepoint"); | |
244 int nclasses = SystemDictionary::number_of_classes(); | |
245 double classes_per_tick = nclasses * (CounterDecayMinIntervalLength * 1e-3 / | |
246 CounterHalfLifeTime); | |
247 for (int i = 0; i < classes_per_tick; i++) { | |
248 klassOop k = SystemDictionary::try_get_next_class(); | |
249 if (k != NULL && k->klass_part()->oop_is_instance()) { | |
250 instanceKlass::cast(k)->methods_do(do_method); | |
251 } | |
252 } | |
253 } | |
254 | |
255 // Called at the end of the safepoint | |
256 void NonTieredCompPolicy::do_safepoint_work() { | |
257 if(UseCounterDecay && CounterDecay::is_decay_needed()) { | |
258 CounterDecay::decay(); | |
259 } | |
260 } | |
261 | |
262 void NonTieredCompPolicy::reprofile(ScopeDesc* trap_scope, bool is_osr) { | |
263 ScopeDesc* sd = trap_scope; | |
264 for (; !sd->is_top(); sd = sd->sender()) { | |
265 // Reset ICs of inlined methods, since they can trigger compilations also. | |
266 sd->method()->invocation_counter()->reset(); | |
267 } | |
268 InvocationCounter* c = sd->method()->invocation_counter(); | |
269 if (is_osr) { | |
270 // It was an OSR method, so bump the count higher. | |
271 c->set(c->state(), CompileThreshold); | |
272 } else { | |
273 c->reset(); | |
274 } | |
275 sd->method()->backedge_counter()->reset(); | |
276 } | |
277 | |
278 // This method can be called by any component of the runtime to notify the policy | |
279 // that it's recommended to delay the complation of this method. | |
280 void NonTieredCompPolicy::delay_compilation(methodOop method) { | |
281 method->invocation_counter()->decay(); | |
282 method->backedge_counter()->decay(); | |
283 } | |
284 | |
285 void NonTieredCompPolicy::disable_compilation(methodOop method) { | |
286 method->invocation_counter()->set_state(InvocationCounter::wait_for_nothing); | |
287 method->backedge_counter()->set_state(InvocationCounter::wait_for_nothing); | |
288 } | |
289 | |
290 CompileTask* NonTieredCompPolicy::select_task(CompileQueue* compile_queue) { | |
291 return compile_queue->first(); | |
292 } | |
293 | |
294 bool NonTieredCompPolicy::is_mature(methodOop method) { | |
295 methodDataOop mdo = method->method_data(); | |
296 assert(mdo != NULL, "Should be"); | |
297 uint current = mdo->mileage_of(method); | |
298 uint initial = mdo->creation_mileage(); | |
299 if (current < initial) | |
300 return true; // some sort of overflow | |
301 uint target; | |
302 if (ProfileMaturityPercentage <= 0) | |
303 target = (uint) -ProfileMaturityPercentage; // absolute value | |
304 else | |
305 target = (uint)( (ProfileMaturityPercentage * CompileThreshold) / 100 ); | |
306 return (current >= initial + target); | |
307 } | |
308 | |
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309 nmethod* NonTieredCompPolicy::event(methodHandle method, methodHandle inlinee, int branch_bci, int bci, CompLevel comp_level, nmethod* nm, TRAPS) { |
1783 | 310 assert(comp_level == CompLevel_none, "This should be only called from the interpreter"); |
311 NOT_PRODUCT(trace_frequency_counter_overflow(method, branch_bci, bci)); | |
312 if (JvmtiExport::can_post_interpreter_events()) { | |
313 assert(THREAD->is_Java_thread(), "Wrong type of thread"); | |
314 if (((JavaThread*)THREAD)->is_interp_only_mode()) { | |
315 // If certain JVMTI events (e.g. frame pop event) are requested then the | |
316 // thread is forced to remain in interpreted code. This is | |
317 // implemented partly by a check in the run_compiled_code | |
318 // section of the interpreter whether we should skip running | |
319 // compiled code, and partly by skipping OSR compiles for | |
320 // interpreted-only threads. | |
321 if (bci != InvocationEntryBci) { | |
322 reset_counter_for_back_branch_event(method); | |
323 return NULL; | |
324 } | |
325 } | |
326 } | |
327 if (bci == InvocationEntryBci) { | |
328 // when code cache is full, compilation gets switched off, UseCompiler | |
329 // is set to false | |
330 if (!method->has_compiled_code() && UseCompiler) { | |
331 method_invocation_event(method, CHECK_NULL); | |
332 } else { | |
333 // Force counter overflow on method entry, even if no compilation | |
334 // happened. (The method_invocation_event call does this also.) | |
335 reset_counter_for_invocation_event(method); | |
336 } | |
337 // compilation at an invocation overflow no longer goes and retries test for | |
338 // compiled method. We always run the loser of the race as interpreted. | |
339 // so return NULL | |
340 return NULL; | |
341 } else { | |
342 // counter overflow in a loop => try to do on-stack-replacement | |
343 nmethod* osr_nm = method->lookup_osr_nmethod_for(bci, CompLevel_highest_tier, true); | |
344 NOT_PRODUCT(trace_osr_request(method, osr_nm, bci)); | |
345 // when code cache is full, we should not compile any more... | |
346 if (osr_nm == NULL && UseCompiler) { | |
347 method_back_branch_event(method, bci, CHECK_NULL); | |
348 osr_nm = method->lookup_osr_nmethod_for(bci, CompLevel_highest_tier, true); | |
349 } | |
350 if (osr_nm == NULL) { | |
351 reset_counter_for_back_branch_event(method); | |
352 return NULL; | |
353 } | |
354 return osr_nm; | |
355 } | |
356 return NULL; | |
357 } | |
358 | |
359 #ifndef PRODUCT | |
360 void NonTieredCompPolicy::trace_frequency_counter_overflow(methodHandle m, int branch_bci, int bci) { | |
361 if (TraceInvocationCounterOverflow) { | |
362 InvocationCounter* ic = m->invocation_counter(); | |
363 InvocationCounter* bc = m->backedge_counter(); | |
364 ResourceMark rm; | |
365 const char* msg = | |
366 bci == InvocationEntryBci | |
367 ? "comp-policy cntr ovfl @ %d in entry of " | |
368 : "comp-policy cntr ovfl @ %d in loop of "; | |
369 tty->print(msg, bci); | |
370 m->print_value(); | |
371 tty->cr(); | |
372 ic->print(); | |
373 bc->print(); | |
374 if (ProfileInterpreter) { | |
375 if (bci != InvocationEntryBci) { | |
376 methodDataOop mdo = m->method_data(); | |
377 if (mdo != NULL) { | |
378 int count = mdo->bci_to_data(branch_bci)->as_JumpData()->taken(); | |
379 tty->print_cr("back branch count = %d", count); | |
380 } | |
381 } | |
382 } | |
383 } | |
384 } | |
385 | |
386 void NonTieredCompPolicy::trace_osr_request(methodHandle method, nmethod* osr, int bci) { | |
387 if (TraceOnStackReplacement) { | |
388 ResourceMark rm; | |
389 tty->print(osr != NULL ? "Reused OSR entry for " : "Requesting OSR entry for "); | |
390 method->print_short_name(tty); | |
391 tty->print_cr(" at bci %d", bci); | |
392 } | |
393 } | |
394 #endif // !PRODUCT | |
395 | |
0 | 396 // SimpleCompPolicy - compile current method |
397 | |
398 void SimpleCompPolicy::method_invocation_event( methodHandle m, TRAPS) { | |
399 int hot_count = m->invocation_count(); | |
400 reset_counter_for_invocation_event(m); | |
401 const char* comment = "count"; | |
402 | |
1783 | 403 if (is_compilation_enabled() && can_be_compiled(m)) { |
0 | 404 nmethod* nm = m->code(); |
405 if (nm == NULL ) { | |
406 const char* comment = "count"; | |
1783 | 407 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_highest_tier, |
0 | 408 m, hot_count, comment, CHECK); |
409 } | |
410 } | |
411 } | |
412 | |
1783 | 413 void SimpleCompPolicy::method_back_branch_event(methodHandle m, int bci, TRAPS) { |
0 | 414 int hot_count = m->backedge_count(); |
415 const char* comment = "backedge_count"; | |
416 | |
1783 | 417 if (is_compilation_enabled() && !m->is_not_osr_compilable() && can_be_compiled(m)) { |
418 CompileBroker::compile_method(m, bci, CompLevel_highest_tier, | |
419 m, hot_count, comment, CHECK); | |
420 NOT_PRODUCT(trace_osr_completion(m->lookup_osr_nmethod_for(bci, CompLevel_highest_tier, true));) | |
0 | 421 } |
422 } | |
423 // StackWalkCompPolicy - walk up stack to find a suitable method to compile | |
424 | |
425 #ifdef COMPILER2 | |
426 const char* StackWalkCompPolicy::_msg = NULL; | |
427 | |
428 | |
429 // Consider m for compilation | |
430 void StackWalkCompPolicy::method_invocation_event(methodHandle m, TRAPS) { | |
431 int hot_count = m->invocation_count(); | |
432 reset_counter_for_invocation_event(m); | |
433 const char* comment = "count"; | |
434 | |
1783 | 435 if (is_compilation_enabled() && m->code() == NULL && can_be_compiled(m)) { |
0 | 436 ResourceMark rm(THREAD); |
437 JavaThread *thread = (JavaThread*)THREAD; | |
438 frame fr = thread->last_frame(); | |
439 assert(fr.is_interpreted_frame(), "must be interpreted"); | |
440 assert(fr.interpreter_frame_method() == m(), "bad method"); | |
441 | |
442 if (TraceCompilationPolicy) { | |
443 tty->print("method invocation trigger: "); | |
444 m->print_short_name(tty); | |
445 tty->print(" ( interpreted " INTPTR_FORMAT ", size=%d ) ", (address)m(), m->code_size()); | |
446 } | |
447 RegisterMap reg_map(thread, false); | |
448 javaVFrame* triggerVF = thread->last_java_vframe(®_map); | |
449 // triggerVF is the frame that triggered its counter | |
450 RFrame* first = new InterpretedRFrame(triggerVF->fr(), thread, m); | |
451 | |
452 if (first->top_method()->code() != NULL) { | |
453 // called obsolete method/nmethod -- no need to recompile | |
454 if (TraceCompilationPolicy) tty->print_cr(" --> " INTPTR_FORMAT, first->top_method()->code()); | |
455 } else { | |
456 if (TimeCompilationPolicy) accumulated_time()->start(); | |
457 GrowableArray<RFrame*>* stack = new GrowableArray<RFrame*>(50); | |
458 stack->push(first); | |
459 RFrame* top = findTopInlinableFrame(stack); | |
460 if (TimeCompilationPolicy) accumulated_time()->stop(); | |
461 assert(top != NULL, "findTopInlinableFrame returned null"); | |
462 if (TraceCompilationPolicy) top->print(); | |
1783 | 463 CompileBroker::compile_method(top->top_method(), InvocationEntryBci, CompLevel_highest_tier, |
0 | 464 m, hot_count, comment, CHECK); |
465 } | |
466 } | |
467 } | |
468 | |
1783 | 469 void StackWalkCompPolicy::method_back_branch_event(methodHandle m, int bci, TRAPS) { |
0 | 470 int hot_count = m->backedge_count(); |
471 const char* comment = "backedge_count"; | |
472 | |
1783 | 473 if (is_compilation_enabled() && !m->is_not_osr_compilable() && can_be_compiled(m)) { |
474 CompileBroker::compile_method(m, bci, CompLevel_highest_tier, m, hot_count, comment, CHECK); | |
0 | 475 |
1783 | 476 NOT_PRODUCT(trace_osr_completion(m->lookup_osr_nmethod_for(bci, CompLevel_highest_tier, true));) |
0 | 477 } |
478 } | |
479 | |
480 RFrame* StackWalkCompPolicy::findTopInlinableFrame(GrowableArray<RFrame*>* stack) { | |
481 // go up the stack until finding a frame that (probably) won't be inlined | |
482 // into its caller | |
483 RFrame* current = stack->at(0); // current choice for stopping | |
484 assert( current && !current->is_compiled(), "" ); | |
485 const char* msg = NULL; | |
486 | |
487 while (1) { | |
488 | |
489 // before going up the stack further, check if doing so would get us into | |
490 // compiled code | |
491 RFrame* next = senderOf(current, stack); | |
492 if( !next ) // No next frame up the stack? | |
493 break; // Then compile with current frame | |
494 | |
495 methodHandle m = current->top_method(); | |
496 methodHandle next_m = next->top_method(); | |
497 | |
498 if (TraceCompilationPolicy && Verbose) { | |
499 tty->print("[caller: "); | |
500 next_m->print_short_name(tty); | |
501 tty->print("] "); | |
502 } | |
503 | |
504 if( !Inline ) { // Inlining turned off | |
505 msg = "Inlining turned off"; | |
506 break; | |
507 } | |
508 if (next_m->is_not_compilable()) { // Did fail to compile this before/ | |
509 msg = "caller not compilable"; | |
510 break; | |
511 } | |
512 if (next->num() > MaxRecompilationSearchLength) { | |
513 // don't go up too high when searching for recompilees | |
514 msg = "don't go up any further: > MaxRecompilationSearchLength"; | |
515 break; | |
516 } | |
517 if (next->distance() > MaxInterpretedSearchLength) { | |
518 // don't go up too high when searching for recompilees | |
519 msg = "don't go up any further: next > MaxInterpretedSearchLength"; | |
520 break; | |
521 } | |
522 // Compiled frame above already decided not to inline; | |
523 // do not recompile him. | |
524 if (next->is_compiled()) { | |
525 msg = "not going up into optimized code"; | |
526 break; | |
527 } | |
528 | |
529 // Interpreted frame above us was already compiled. Do not force | |
530 // a recompile, although if the frame above us runs long enough an | |
531 // OSR might still happen. | |
532 if( current->is_interpreted() && next_m->has_compiled_code() ) { | |
533 msg = "not going up -- already compiled caller"; | |
534 break; | |
535 } | |
536 | |
537 // Compute how frequent this call site is. We have current method 'm'. | |
538 // We know next method 'next_m' is interpreted. Find the call site and | |
539 // check the various invocation counts. | |
540 int invcnt = 0; // Caller counts | |
541 if (ProfileInterpreter) { | |
542 invcnt = next_m->interpreter_invocation_count(); | |
543 } | |
544 int cnt = 0; // Call site counts | |
545 if (ProfileInterpreter && next_m->method_data() != NULL) { | |
546 ResourceMark rm; | |
547 int bci = next->top_vframe()->bci(); | |
548 ProfileData* data = next_m->method_data()->bci_to_data(bci); | |
549 if (data != NULL && data->is_CounterData()) | |
550 cnt = data->as_CounterData()->count(); | |
551 } | |
552 | |
553 // Caller counts / call-site counts; i.e. is this call site | |
554 // a hot call site for method next_m? | |
555 int freq = (invcnt) ? cnt/invcnt : cnt; | |
556 | |
557 // Check size and frequency limits | |
558 if ((msg = shouldInline(m, freq, cnt)) != NULL) { | |
559 break; | |
560 } | |
561 // Check inlining negative tests | |
562 if ((msg = shouldNotInline(m)) != NULL) { | |
563 break; | |
564 } | |
565 | |
566 | |
567 // If the caller method is too big or something then we do not want to | |
568 // compile it just to inline a method | |
1783 | 569 if (!can_be_compiled(next_m)) { |
0 | 570 msg = "caller cannot be compiled"; |
571 break; | |
572 } | |
573 | |
574 if( next_m->name() == vmSymbols::class_initializer_name() ) { | |
575 msg = "do not compile class initializer (OSR ok)"; | |
576 break; | |
577 } | |
578 | |
579 if (TraceCompilationPolicy && Verbose) { | |
580 tty->print("\n\t check caller: "); | |
581 next_m->print_short_name(tty); | |
582 tty->print(" ( interpreted " INTPTR_FORMAT ", size=%d ) ", (address)next_m(), next_m->code_size()); | |
583 } | |
584 | |
585 current = next; | |
586 } | |
587 | |
588 assert( !current || !current->is_compiled(), "" ); | |
589 | |
590 if (TraceCompilationPolicy && msg) tty->print("(%s)\n", msg); | |
591 | |
592 return current; | |
593 } | |
594 | |
595 RFrame* StackWalkCompPolicy::senderOf(RFrame* rf, GrowableArray<RFrame*>* stack) { | |
596 RFrame* sender = rf->caller(); | |
597 if (sender && sender->num() == stack->length()) stack->push(sender); | |
598 return sender; | |
599 } | |
600 | |
601 | |
602 const char* StackWalkCompPolicy::shouldInline(methodHandle m, float freq, int cnt) { | |
603 // Allows targeted inlining | |
604 // positive filter: should send be inlined? returns NULL (--> yes) | |
605 // or rejection msg | |
606 int max_size = MaxInlineSize; | |
607 int cost = m->code_size(); | |
608 | |
609 // Check for too many throws (and not too huge) | |
610 if (m->interpreter_throwout_count() > InlineThrowCount && cost < InlineThrowMaxSize ) { | |
611 return NULL; | |
612 } | |
613 | |
614 // bump the max size if the call is frequent | |
615 if ((freq >= InlineFrequencyRatio) || (cnt >= InlineFrequencyCount)) { | |
616 if (TraceFrequencyInlining) { | |
617 tty->print("(Inlined frequent method)\n"); | |
618 m->print(); | |
619 } | |
620 max_size = FreqInlineSize; | |
621 } | |
622 if (cost > max_size) { | |
623 return (_msg = "too big"); | |
624 } | |
625 return NULL; | |
626 } | |
627 | |
628 | |
629 const char* StackWalkCompPolicy::shouldNotInline(methodHandle m) { | |
630 // negative filter: should send NOT be inlined? returns NULL (--> inline) or rejection msg | |
631 if (m->is_abstract()) return (_msg = "abstract method"); | |
632 // note: we allow ik->is_abstract() | |
633 if (!instanceKlass::cast(m->method_holder())->is_initialized()) return (_msg = "method holder not initialized"); | |
634 if (m->is_native()) return (_msg = "native method"); | |
635 nmethod* m_code = m->code(); | |
1748 | 636 if (m_code != NULL && m_code->code_size() > InlineSmallCode) |
0 | 637 return (_msg = "already compiled into a big method"); |
638 | |
639 // use frequency-based objections only for non-trivial methods | |
640 if (m->code_size() <= MaxTrivialSize) return NULL; | |
641 if (UseInterpreter) { // don't use counts with -Xcomp | |
642 if ((m->code() == NULL) && m->was_never_executed()) return (_msg = "never executed"); | |
643 if (!m->was_executed_more_than(MIN2(MinInliningThreshold, CompileThreshold >> 1))) return (_msg = "executed < MinInliningThreshold times"); | |
644 } | |
645 if (methodOopDesc::has_unloaded_classes_in_signature(m, JavaThread::current())) return (_msg = "unloaded signature classes"); | |
646 | |
647 return NULL; | |
648 } | |
649 | |
650 | |
651 | |
652 #endif // COMPILER2 |