Mercurial > hg > graal-compiler
annotate src/share/vm/runtime/compilationPolicy.cpp @ 7453:c98b676a98b4
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Reviewed-by: johnc, jwilhelm
author | brutisso |
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date | Fri, 04 Jan 2013 21:33:22 +0100 |
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0 | 1 /* |
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2 * Copyright (c) 2000, 2012, 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" | |
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31 #include "oops/methodData.hpp" |
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32 #include "oops/method.hpp" |
1972 | 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) { |
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100 // Don't allow Xcomp to cause compiles in replay mode |
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101 if (ReplayCompiles) return false; |
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102 |
0 | 103 if (m->has_compiled_code()) return false; // already compiled |
1783 | 104 if (!can_be_compiled(m, comp_level)) return false; |
0 | 105 |
106 return !UseInterpreter || // must compile all methods | |
1202 | 107 (UseCompiler && AlwaysCompileLoopMethods && m->has_loops() && CompileBroker::should_compile_new_jobs()); // eagerly compile loop methods |
0 | 108 } |
109 | |
110 // Returns true if m is allowed to be compiled | |
1783 | 111 bool CompilationPolicy::can_be_compiled(methodHandle m, int comp_level) { |
0 | 112 if (m->is_abstract()) return false; |
113 if (DontCompileHugeMethods && m->code_size() > HugeMethodLimit) return false; | |
114 | |
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115 // Math intrinsics should never be compiled as this can lead to |
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116 // monotonicity problems because the interpreter will prefer the |
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117 // compiled code to the intrinsic version. This can't happen in |
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118 // production because the invocation counter can't be incremented |
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119 // but we shouldn't expose the system to this problem in testing |
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120 // modes. |
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121 if (!AbstractInterpreter::can_be_compiled(m)) { |
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122 return false; |
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123 } |
1783 | 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 } | |
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130 |
1783 | 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(); | |
0 | 134 } |
135 | |
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 } | |
142 | |
1783 | 143 void NonTieredCompPolicy::trace_osr_completion(nmethod* osr_nm) { |
0 | 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 | |
150 | |
1783 | 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 } | |
162 | |
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163 // Note: this policy is used ONLY if TieredCompilation is off. |
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164 // compiler_count() behaves the following way: |
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165 // - with TIERED build (with both COMPILER1 and COMPILER2 defined) it should return |
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166 // zero for the c1 compilation levels, hence the particular ordering of the |
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167 // statements. |
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168 // - the same should happen when COMPILER2 is defined and COMPILER1 is not |
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169 // (server build without TIERED defined). |
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170 // - if only COMPILER1 is defined (client build), zero should be returned for |
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171 // the c2 level. |
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172 // - if neither is defined - always return zero. |
1783 | 173 int NonTieredCompPolicy::compiler_count(CompLevel comp_level) { |
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174 assert(!TieredCompilation, "This policy should not be used with TieredCompilation"); |
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175 #ifdef COMPILER2 |
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176 if (is_c2_compile(comp_level)) { |
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177 return _compiler_count; |
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178 } else { |
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179 return 0; |
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180 } |
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181 #endif |
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182 |
1783 | 183 #ifdef COMPILER1 |
184 if (is_c1_compile(comp_level)) { | |
185 return _compiler_count; | |
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186 } else { |
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187 return 0; |
1783 | 188 } |
189 #endif | |
190 | |
191 return 0; | |
192 } | |
193 | |
194 void NonTieredCompPolicy::reset_counter_for_invocation_event(methodHandle m) { | |
0 | 195 // Make sure invocation and backedge counter doesn't overflow again right away |
196 // as would be the case for native methods. | |
197 | |
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 m->invocation_counter()->set_carry(); | |
201 m->backedge_counter()->set_carry(); | |
202 | |
203 assert(!m->was_never_executed(), "don't reset to 0 -- could be mistaken for never-executed"); | |
204 } | |
205 | |
1783 | 206 void NonTieredCompPolicy::reset_counter_for_back_branch_event(methodHandle m) { |
0 | 207 // Delay next back-branch event but pump up invocation counter to triger |
208 // whole method compilation. | |
209 InvocationCounter* i = m->invocation_counter(); | |
210 InvocationCounter* b = m->backedge_counter(); | |
211 | |
212 // Don't set invocation_counter's value too low otherwise the method will | |
213 // look like immature (ic < ~5300) which prevents the inlining based on | |
214 // the type profiling. | |
215 i->set(i->state(), CompileThreshold); | |
216 // Don't reset counter too low - it is used to check if OSR method is ready. | |
217 b->set(b->state(), CompileThreshold / 2); | |
218 } | |
219 | |
1783 | 220 // |
221 // CounterDecay | |
222 // | |
223 // Interates through invocation counters and decrements them. This | |
224 // is done at each safepoint. | |
225 // | |
226 class CounterDecay : public AllStatic { | |
227 static jlong _last_timestamp; | |
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228 static void do_method(Method* m) { |
1783 | 229 m->invocation_counter()->decay(); |
230 } | |
231 public: | |
232 static void decay(); | |
233 static bool is_decay_needed() { | |
234 return (os::javaTimeMillis() - _last_timestamp) > CounterDecayMinIntervalLength; | |
235 } | |
236 }; | |
237 | |
238 jlong CounterDecay::_last_timestamp = 0; | |
239 | |
240 void CounterDecay::decay() { | |
241 _last_timestamp = os::javaTimeMillis(); | |
242 | |
243 // This operation is going to be performed only at the end of a safepoint | |
244 // and hence GC's will not be going on, all Java mutators are suspended | |
245 // at this point and hence SystemDictionary_lock is also not needed. | |
246 assert(SafepointSynchronize::is_at_safepoint(), "can only be executed at a safepoint"); | |
247 int nclasses = SystemDictionary::number_of_classes(); | |
248 double classes_per_tick = nclasses * (CounterDecayMinIntervalLength * 1e-3 / | |
249 CounterHalfLifeTime); | |
250 for (int i = 0; i < classes_per_tick; i++) { | |
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251 Klass* k = SystemDictionary::try_get_next_class(); |
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252 if (k != NULL && k->oop_is_instance()) { |
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253 InstanceKlass::cast(k)->methods_do(do_method); |
1783 | 254 } |
255 } | |
256 } | |
257 | |
258 // Called at the end of the safepoint | |
259 void NonTieredCompPolicy::do_safepoint_work() { | |
260 if(UseCounterDecay && CounterDecay::is_decay_needed()) { | |
261 CounterDecay::decay(); | |
262 } | |
263 } | |
264 | |
265 void NonTieredCompPolicy::reprofile(ScopeDesc* trap_scope, bool is_osr) { | |
266 ScopeDesc* sd = trap_scope; | |
267 for (; !sd->is_top(); sd = sd->sender()) { | |
268 // Reset ICs of inlined methods, since they can trigger compilations also. | |
269 sd->method()->invocation_counter()->reset(); | |
270 } | |
271 InvocationCounter* c = sd->method()->invocation_counter(); | |
272 if (is_osr) { | |
273 // It was an OSR method, so bump the count higher. | |
274 c->set(c->state(), CompileThreshold); | |
275 } else { | |
276 c->reset(); | |
277 } | |
278 sd->method()->backedge_counter()->reset(); | |
279 } | |
280 | |
281 // This method can be called by any component of the runtime to notify the policy | |
282 // that it's recommended to delay the complation of this method. | |
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283 void NonTieredCompPolicy::delay_compilation(Method* method) { |
1783 | 284 method->invocation_counter()->decay(); |
285 method->backedge_counter()->decay(); | |
286 } | |
287 | |
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288 void NonTieredCompPolicy::disable_compilation(Method* method) { |
1783 | 289 method->invocation_counter()->set_state(InvocationCounter::wait_for_nothing); |
290 method->backedge_counter()->set_state(InvocationCounter::wait_for_nothing); | |
291 } | |
292 | |
293 CompileTask* NonTieredCompPolicy::select_task(CompileQueue* compile_queue) { | |
294 return compile_queue->first(); | |
295 } | |
296 | |
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297 bool NonTieredCompPolicy::is_mature(Method* method) { |
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298 MethodData* mdo = method->method_data(); |
1783 | 299 assert(mdo != NULL, "Should be"); |
300 uint current = mdo->mileage_of(method); | |
301 uint initial = mdo->creation_mileage(); | |
302 if (current < initial) | |
303 return true; // some sort of overflow | |
304 uint target; | |
305 if (ProfileMaturityPercentage <= 0) | |
306 target = (uint) -ProfileMaturityPercentage; // absolute value | |
307 else | |
308 target = (uint)( (ProfileMaturityPercentage * CompileThreshold) / 100 ); | |
309 return (current >= initial + target); | |
310 } | |
311 | |
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312 nmethod* NonTieredCompPolicy::event(methodHandle method, methodHandle inlinee, int branch_bci, |
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313 int bci, CompLevel comp_level, nmethod* nm, JavaThread* thread) { |
1783 | 314 assert(comp_level == CompLevel_none, "This should be only called from the interpreter"); |
315 NOT_PRODUCT(trace_frequency_counter_overflow(method, branch_bci, bci)); | |
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316 if (JvmtiExport::can_post_interpreter_events() && thread->is_interp_only_mode()) { |
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317 // If certain JVMTI events (e.g. frame pop event) are requested then the |
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318 // thread is forced to remain in interpreted code. This is |
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319 // implemented partly by a check in the run_compiled_code |
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320 // section of the interpreter whether we should skip running |
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321 // compiled code, and partly by skipping OSR compiles for |
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322 // interpreted-only threads. |
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323 if (bci != InvocationEntryBci) { |
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324 reset_counter_for_back_branch_event(method); |
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325 return NULL; |
1783 | 326 } |
327 } | |
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328 if (CompileTheWorld || ReplayCompiles) { |
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329 // Don't trigger other compiles in testing mode |
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330 if (bci == InvocationEntryBci) { |
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331 reset_counter_for_invocation_event(method); |
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332 } else { |
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333 reset_counter_for_back_branch_event(method); |
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334 } |
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335 return NULL; |
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336 } |
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337 |
1783 | 338 if (bci == InvocationEntryBci) { |
339 // when code cache is full, compilation gets switched off, UseCompiler | |
340 // is set to false | |
341 if (!method->has_compiled_code() && UseCompiler) { | |
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342 method_invocation_event(method, thread); |
1783 | 343 } else { |
344 // Force counter overflow on method entry, even if no compilation | |
345 // happened. (The method_invocation_event call does this also.) | |
346 reset_counter_for_invocation_event(method); | |
347 } | |
348 // compilation at an invocation overflow no longer goes and retries test for | |
349 // compiled method. We always run the loser of the race as interpreted. | |
350 // so return NULL | |
351 return NULL; | |
352 } else { | |
353 // counter overflow in a loop => try to do on-stack-replacement | |
354 nmethod* osr_nm = method->lookup_osr_nmethod_for(bci, CompLevel_highest_tier, true); | |
355 NOT_PRODUCT(trace_osr_request(method, osr_nm, bci)); | |
356 // when code cache is full, we should not compile any more... | |
357 if (osr_nm == NULL && UseCompiler) { | |
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358 method_back_branch_event(method, bci, thread); |
1783 | 359 osr_nm = method->lookup_osr_nmethod_for(bci, CompLevel_highest_tier, true); |
360 } | |
361 if (osr_nm == NULL) { | |
362 reset_counter_for_back_branch_event(method); | |
363 return NULL; | |
364 } | |
365 return osr_nm; | |
366 } | |
367 return NULL; | |
368 } | |
369 | |
370 #ifndef PRODUCT | |
371 void NonTieredCompPolicy::trace_frequency_counter_overflow(methodHandle m, int branch_bci, int bci) { | |
372 if (TraceInvocationCounterOverflow) { | |
373 InvocationCounter* ic = m->invocation_counter(); | |
374 InvocationCounter* bc = m->backedge_counter(); | |
375 ResourceMark rm; | |
376 const char* msg = | |
377 bci == InvocationEntryBci | |
378 ? "comp-policy cntr ovfl @ %d in entry of " | |
379 : "comp-policy cntr ovfl @ %d in loop of "; | |
380 tty->print(msg, bci); | |
381 m->print_value(); | |
382 tty->cr(); | |
383 ic->print(); | |
384 bc->print(); | |
385 if (ProfileInterpreter) { | |
386 if (bci != InvocationEntryBci) { | |
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387 MethodData* mdo = m->method_data(); |
1783 | 388 if (mdo != NULL) { |
389 int count = mdo->bci_to_data(branch_bci)->as_JumpData()->taken(); | |
390 tty->print_cr("back branch count = %d", count); | |
391 } | |
392 } | |
393 } | |
394 } | |
395 } | |
396 | |
397 void NonTieredCompPolicy::trace_osr_request(methodHandle method, nmethod* osr, int bci) { | |
398 if (TraceOnStackReplacement) { | |
399 ResourceMark rm; | |
400 tty->print(osr != NULL ? "Reused OSR entry for " : "Requesting OSR entry for "); | |
401 method->print_short_name(tty); | |
402 tty->print_cr(" at bci %d", bci); | |
403 } | |
404 } | |
405 #endif // !PRODUCT | |
406 | |
0 | 407 // SimpleCompPolicy - compile current method |
408 | |
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409 void SimpleCompPolicy::method_invocation_event(methodHandle m, JavaThread* thread) { |
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410 const int comp_level = CompLevel_highest_tier; |
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411 const int hot_count = m->invocation_count(); |
0 | 412 reset_counter_for_invocation_event(m); |
413 const char* comment = "count"; | |
414 | |
1783 | 415 if (is_compilation_enabled() && can_be_compiled(m)) { |
0 | 416 nmethod* nm = m->code(); |
417 if (nm == NULL ) { | |
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418 CompileBroker::compile_method(m, InvocationEntryBci, comp_level, m, hot_count, comment, thread); |
0 | 419 } |
420 } | |
421 } | |
422 | |
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423 void SimpleCompPolicy::method_back_branch_event(methodHandle m, int bci, JavaThread* thread) { |
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424 const int comp_level = CompLevel_highest_tier; |
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425 const int hot_count = m->backedge_count(); |
0 | 426 const char* comment = "backedge_count"; |
427 | |
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428 if (is_compilation_enabled() && !m->is_not_osr_compilable(comp_level) && can_be_compiled(m)) { |
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429 CompileBroker::compile_method(m, bci, comp_level, m, hot_count, comment, thread); |
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430 NOT_PRODUCT(trace_osr_completion(m->lookup_osr_nmethod_for(bci, comp_level, true));) |
0 | 431 } |
432 } | |
433 // StackWalkCompPolicy - walk up stack to find a suitable method to compile | |
434 | |
435 #ifdef COMPILER2 | |
436 const char* StackWalkCompPolicy::_msg = NULL; | |
437 | |
438 | |
439 // Consider m for compilation | |
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440 void StackWalkCompPolicy::method_invocation_event(methodHandle m, JavaThread* thread) { |
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441 const int comp_level = CompLevel_highest_tier; |
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442 const int hot_count = m->invocation_count(); |
0 | 443 reset_counter_for_invocation_event(m); |
444 const char* comment = "count"; | |
445 | |
1783 | 446 if (is_compilation_enabled() && m->code() == NULL && can_be_compiled(m)) { |
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447 ResourceMark rm(thread); |
0 | 448 frame fr = thread->last_frame(); |
449 assert(fr.is_interpreted_frame(), "must be interpreted"); | |
450 assert(fr.interpreter_frame_method() == m(), "bad method"); | |
451 | |
452 if (TraceCompilationPolicy) { | |
453 tty->print("method invocation trigger: "); | |
454 m->print_short_name(tty); | |
455 tty->print(" ( interpreted " INTPTR_FORMAT ", size=%d ) ", (address)m(), m->code_size()); | |
456 } | |
457 RegisterMap reg_map(thread, false); | |
458 javaVFrame* triggerVF = thread->last_java_vframe(®_map); | |
459 // triggerVF is the frame that triggered its counter | |
460 RFrame* first = new InterpretedRFrame(triggerVF->fr(), thread, m); | |
461 | |
462 if (first->top_method()->code() != NULL) { | |
463 // called obsolete method/nmethod -- no need to recompile | |
464 if (TraceCompilationPolicy) tty->print_cr(" --> " INTPTR_FORMAT, first->top_method()->code()); | |
465 } else { | |
466 if (TimeCompilationPolicy) accumulated_time()->start(); | |
467 GrowableArray<RFrame*>* stack = new GrowableArray<RFrame*>(50); | |
468 stack->push(first); | |
469 RFrame* top = findTopInlinableFrame(stack); | |
470 if (TimeCompilationPolicy) accumulated_time()->stop(); | |
471 assert(top != NULL, "findTopInlinableFrame returned null"); | |
472 if (TraceCompilationPolicy) top->print(); | |
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473 CompileBroker::compile_method(top->top_method(), InvocationEntryBci, comp_level, |
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474 m, hot_count, comment, thread); |
0 | 475 } |
476 } | |
477 } | |
478 | |
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479 void StackWalkCompPolicy::method_back_branch_event(methodHandle m, int bci, JavaThread* thread) { |
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480 const int comp_level = CompLevel_highest_tier; |
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481 const int hot_count = m->backedge_count(); |
0 | 482 const char* comment = "backedge_count"; |
483 | |
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484 if (is_compilation_enabled() && !m->is_not_osr_compilable(comp_level) && can_be_compiled(m)) { |
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485 CompileBroker::compile_method(m, bci, comp_level, m, hot_count, comment, thread); |
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486 NOT_PRODUCT(trace_osr_completion(m->lookup_osr_nmethod_for(bci, comp_level, true));) |
0 | 487 } |
488 } | |
489 | |
490 RFrame* StackWalkCompPolicy::findTopInlinableFrame(GrowableArray<RFrame*>* stack) { | |
491 // go up the stack until finding a frame that (probably) won't be inlined | |
492 // into its caller | |
493 RFrame* current = stack->at(0); // current choice for stopping | |
494 assert( current && !current->is_compiled(), "" ); | |
495 const char* msg = NULL; | |
496 | |
497 while (1) { | |
498 | |
499 // before going up the stack further, check if doing so would get us into | |
500 // compiled code | |
501 RFrame* next = senderOf(current, stack); | |
502 if( !next ) // No next frame up the stack? | |
503 break; // Then compile with current frame | |
504 | |
505 methodHandle m = current->top_method(); | |
506 methodHandle next_m = next->top_method(); | |
507 | |
508 if (TraceCompilationPolicy && Verbose) { | |
509 tty->print("[caller: "); | |
510 next_m->print_short_name(tty); | |
511 tty->print("] "); | |
512 } | |
513 | |
514 if( !Inline ) { // Inlining turned off | |
515 msg = "Inlining turned off"; | |
516 break; | |
517 } | |
518 if (next_m->is_not_compilable()) { // Did fail to compile this before/ | |
519 msg = "caller not compilable"; | |
520 break; | |
521 } | |
522 if (next->num() > MaxRecompilationSearchLength) { | |
523 // don't go up too high when searching for recompilees | |
524 msg = "don't go up any further: > MaxRecompilationSearchLength"; | |
525 break; | |
526 } | |
527 if (next->distance() > MaxInterpretedSearchLength) { | |
528 // don't go up too high when searching for recompilees | |
529 msg = "don't go up any further: next > MaxInterpretedSearchLength"; | |
530 break; | |
531 } | |
532 // Compiled frame above already decided not to inline; | |
533 // do not recompile him. | |
534 if (next->is_compiled()) { | |
535 msg = "not going up into optimized code"; | |
536 break; | |
537 } | |
538 | |
539 // Interpreted frame above us was already compiled. Do not force | |
540 // a recompile, although if the frame above us runs long enough an | |
541 // OSR might still happen. | |
542 if( current->is_interpreted() && next_m->has_compiled_code() ) { | |
543 msg = "not going up -- already compiled caller"; | |
544 break; | |
545 } | |
546 | |
547 // Compute how frequent this call site is. We have current method 'm'. | |
548 // We know next method 'next_m' is interpreted. Find the call site and | |
549 // check the various invocation counts. | |
550 int invcnt = 0; // Caller counts | |
551 if (ProfileInterpreter) { | |
552 invcnt = next_m->interpreter_invocation_count(); | |
553 } | |
554 int cnt = 0; // Call site counts | |
555 if (ProfileInterpreter && next_m->method_data() != NULL) { | |
556 ResourceMark rm; | |
557 int bci = next->top_vframe()->bci(); | |
558 ProfileData* data = next_m->method_data()->bci_to_data(bci); | |
559 if (data != NULL && data->is_CounterData()) | |
560 cnt = data->as_CounterData()->count(); | |
561 } | |
562 | |
563 // Caller counts / call-site counts; i.e. is this call site | |
564 // a hot call site for method next_m? | |
565 int freq = (invcnt) ? cnt/invcnt : cnt; | |
566 | |
567 // Check size and frequency limits | |
568 if ((msg = shouldInline(m, freq, cnt)) != NULL) { | |
569 break; | |
570 } | |
571 // Check inlining negative tests | |
572 if ((msg = shouldNotInline(m)) != NULL) { | |
573 break; | |
574 } | |
575 | |
576 | |
577 // If the caller method is too big or something then we do not want to | |
578 // compile it just to inline a method | |
1783 | 579 if (!can_be_compiled(next_m)) { |
0 | 580 msg = "caller cannot be compiled"; |
581 break; | |
582 } | |
583 | |
584 if( next_m->name() == vmSymbols::class_initializer_name() ) { | |
585 msg = "do not compile class initializer (OSR ok)"; | |
586 break; | |
587 } | |
588 | |
589 if (TraceCompilationPolicy && Verbose) { | |
590 tty->print("\n\t check caller: "); | |
591 next_m->print_short_name(tty); | |
592 tty->print(" ( interpreted " INTPTR_FORMAT ", size=%d ) ", (address)next_m(), next_m->code_size()); | |
593 } | |
594 | |
595 current = next; | |
596 } | |
597 | |
598 assert( !current || !current->is_compiled(), "" ); | |
599 | |
600 if (TraceCompilationPolicy && msg) tty->print("(%s)\n", msg); | |
601 | |
602 return current; | |
603 } | |
604 | |
605 RFrame* StackWalkCompPolicy::senderOf(RFrame* rf, GrowableArray<RFrame*>* stack) { | |
606 RFrame* sender = rf->caller(); | |
607 if (sender && sender->num() == stack->length()) stack->push(sender); | |
608 return sender; | |
609 } | |
610 | |
611 | |
612 const char* StackWalkCompPolicy::shouldInline(methodHandle m, float freq, int cnt) { | |
613 // Allows targeted inlining | |
614 // positive filter: should send be inlined? returns NULL (--> yes) | |
615 // or rejection msg | |
616 int max_size = MaxInlineSize; | |
617 int cost = m->code_size(); | |
618 | |
619 // Check for too many throws (and not too huge) | |
620 if (m->interpreter_throwout_count() > InlineThrowCount && cost < InlineThrowMaxSize ) { | |
621 return NULL; | |
622 } | |
623 | |
624 // bump the max size if the call is frequent | |
625 if ((freq >= InlineFrequencyRatio) || (cnt >= InlineFrequencyCount)) { | |
626 if (TraceFrequencyInlining) { | |
627 tty->print("(Inlined frequent method)\n"); | |
628 m->print(); | |
629 } | |
630 max_size = FreqInlineSize; | |
631 } | |
632 if (cost > max_size) { | |
633 return (_msg = "too big"); | |
634 } | |
635 return NULL; | |
636 } | |
637 | |
638 | |
639 const char* StackWalkCompPolicy::shouldNotInline(methodHandle m) { | |
640 // negative filter: should send NOT be inlined? returns NULL (--> inline) or rejection msg | |
641 if (m->is_abstract()) return (_msg = "abstract method"); | |
642 // note: we allow ik->is_abstract() | |
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643 if (!m->method_holder()->is_initialized()) return (_msg = "method holder not initialized"); |
0 | 644 if (m->is_native()) return (_msg = "native method"); |
645 nmethod* m_code = m->code(); | |
1748 | 646 if (m_code != NULL && m_code->code_size() > InlineSmallCode) |
0 | 647 return (_msg = "already compiled into a big method"); |
648 | |
649 // use frequency-based objections only for non-trivial methods | |
650 if (m->code_size() <= MaxTrivialSize) return NULL; | |
651 if (UseInterpreter) { // don't use counts with -Xcomp | |
652 if ((m->code() == NULL) && m->was_never_executed()) return (_msg = "never executed"); | |
653 if (!m->was_executed_more_than(MIN2(MinInliningThreshold, CompileThreshold >> 1))) return (_msg = "executed < MinInliningThreshold times"); | |
654 } | |
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655 if (Method::has_unloaded_classes_in_signature(m, JavaThread::current())) return (_msg = "unloaded signature classes"); |
0 | 656 |
657 return NULL; | |
658 } | |
659 | |
660 | |
661 | |
662 #endif // COMPILER2 |