Mercurial > hg > graal-compiler
annotate src/share/vm/runtime/compilationPolicy.cpp @ 9080:b84fd7d73702
8007288: Additional WB API for compiler's testing
Reviewed-by: kvn, vlivanov
| author | iignatyev |
|---|---|
| date | Tue, 09 Apr 2013 09:54:17 -0700 |
| parents | bd7a7ce2e264 |
| children | 89e4d67fdd2a 8df6ddda8090 |
| rev | line source |
|---|---|
| 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); | |
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126 } else if (is_compile(comp_level)) { |
| 1783 | 127 return !m->is_not_compilable(comp_level); |
| 128 } | |
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129 return false; |
| 1783 | 130 } |
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131 |
| 1783 | 132 bool CompilationPolicy::is_compilation_enabled() { |
| 133 // NOTE: CompileBroker::should_compile_new_jobs() checks for UseCompiler | |
| 134 return !delay_compilation_during_startup() && CompileBroker::should_compile_new_jobs(); | |
| 0 | 135 } |
| 136 | |
| 137 #ifndef PRODUCT | |
| 138 void CompilationPolicy::print_time() { | |
| 139 tty->print_cr ("Accumulated compilationPolicy times:"); | |
| 140 tty->print_cr ("---------------------------"); | |
| 141 tty->print_cr (" Total: %3.3f sec.", _accumulated_time.seconds()); | |
| 142 } | |
| 143 | |
| 1783 | 144 void NonTieredCompPolicy::trace_osr_completion(nmethod* osr_nm) { |
| 0 | 145 if (TraceOnStackReplacement) { |
| 146 if (osr_nm == NULL) tty->print_cr("compilation failed"); | |
| 147 else tty->print_cr("nmethod " INTPTR_FORMAT, osr_nm); | |
| 148 } | |
| 149 } | |
| 150 #endif // !PRODUCT | |
| 151 | |
| 1783 | 152 void NonTieredCompPolicy::initialize() { |
| 153 // Setup the compiler thread numbers | |
| 154 if (CICompilerCountPerCPU) { | |
| 155 // Example: if CICompilerCountPerCPU is true, then we get | |
| 156 // max(log2(8)-1,1) = 2 compiler threads on an 8-way machine. | |
| 157 // May help big-app startup time. | |
| 158 _compiler_count = MAX2(log2_intptr(os::active_processor_count())-1,1); | |
| 159 } else { | |
| 160 _compiler_count = CICompilerCount; | |
| 161 } | |
| 162 } | |
| 163 | |
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164 // Note: this policy is used ONLY if TieredCompilation is off. |
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165 // compiler_count() behaves the following way: |
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166 // - with TIERED build (with both COMPILER1 and COMPILER2 defined) it should return |
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167 // zero for the c1 compilation levels, hence the particular ordering of the |
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168 // statements. |
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169 // - the same should happen when COMPILER2 is defined and COMPILER1 is not |
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170 // (server build without TIERED defined). |
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171 // - if only COMPILER1 is defined (client build), zero should be returned for |
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172 // the c2 level. |
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173 // - if neither is defined - always return zero. |
| 1783 | 174 int NonTieredCompPolicy::compiler_count(CompLevel comp_level) { |
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175 assert(!TieredCompilation, "This policy should not be used with TieredCompilation"); |
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176 #ifdef COMPILER2 |
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177 if (is_c2_compile(comp_level)) { |
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178 return _compiler_count; |
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179 } else { |
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180 return 0; |
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181 } |
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182 #endif |
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183 |
| 1783 | 184 #ifdef COMPILER1 |
| 185 if (is_c1_compile(comp_level)) { | |
| 186 return _compiler_count; | |
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187 } else { |
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188 return 0; |
| 1783 | 189 } |
| 190 #endif | |
| 191 | |
| 192 return 0; | |
| 193 } | |
| 194 | |
| 195 void NonTieredCompPolicy::reset_counter_for_invocation_event(methodHandle m) { | |
| 0 | 196 // Make sure invocation and backedge counter doesn't overflow again right away |
| 197 // as would be the case for native methods. | |
| 198 | |
| 199 // BUT also make sure the method doesn't look like it was never executed. | |
| 200 // Set carry bit and reduce counter's value to min(count, CompileThreshold/2). | |
| 201 m->invocation_counter()->set_carry(); | |
| 202 m->backedge_counter()->set_carry(); | |
| 203 | |
| 204 assert(!m->was_never_executed(), "don't reset to 0 -- could be mistaken for never-executed"); | |
| 205 } | |
| 206 | |
| 1783 | 207 void NonTieredCompPolicy::reset_counter_for_back_branch_event(methodHandle m) { |
| 0 | 208 // Delay next back-branch event but pump up invocation counter to triger |
| 209 // whole method compilation. | |
| 210 InvocationCounter* i = m->invocation_counter(); | |
| 211 InvocationCounter* b = m->backedge_counter(); | |
| 212 | |
| 213 // Don't set invocation_counter's value too low otherwise the method will | |
| 214 // look like immature (ic < ~5300) which prevents the inlining based on | |
| 215 // the type profiling. | |
| 216 i->set(i->state(), CompileThreshold); | |
| 217 // Don't reset counter too low - it is used to check if OSR method is ready. | |
| 218 b->set(b->state(), CompileThreshold / 2); | |
| 219 } | |
| 220 | |
| 1783 | 221 // |
| 222 // CounterDecay | |
| 223 // | |
| 224 // Interates through invocation counters and decrements them. This | |
| 225 // is done at each safepoint. | |
| 226 // | |
| 227 class CounterDecay : public AllStatic { | |
| 228 static jlong _last_timestamp; | |
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229 static void do_method(Method* m) { |
| 1783 | 230 m->invocation_counter()->decay(); |
| 231 } | |
| 232 public: | |
| 233 static void decay(); | |
| 234 static bool is_decay_needed() { | |
| 235 return (os::javaTimeMillis() - _last_timestamp) > CounterDecayMinIntervalLength; | |
| 236 } | |
| 237 }; | |
| 238 | |
| 239 jlong CounterDecay::_last_timestamp = 0; | |
| 240 | |
| 241 void CounterDecay::decay() { | |
| 242 _last_timestamp = os::javaTimeMillis(); | |
| 243 | |
| 244 // This operation is going to be performed only at the end of a safepoint | |
| 245 // and hence GC's will not be going on, all Java mutators are suspended | |
| 246 // at this point and hence SystemDictionary_lock is also not needed. | |
| 247 assert(SafepointSynchronize::is_at_safepoint(), "can only be executed at a safepoint"); | |
| 248 int nclasses = SystemDictionary::number_of_classes(); | |
| 249 double classes_per_tick = nclasses * (CounterDecayMinIntervalLength * 1e-3 / | |
| 250 CounterHalfLifeTime); | |
| 251 for (int i = 0; i < classes_per_tick; i++) { | |
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252 Klass* k = SystemDictionary::try_get_next_class(); |
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253 if (k != NULL && k->oop_is_instance()) { |
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254 InstanceKlass::cast(k)->methods_do(do_method); |
| 1783 | 255 } |
| 256 } | |
| 257 } | |
| 258 | |
| 259 // Called at the end of the safepoint | |
| 260 void NonTieredCompPolicy::do_safepoint_work() { | |
| 261 if(UseCounterDecay && CounterDecay::is_decay_needed()) { | |
| 262 CounterDecay::decay(); | |
| 263 } | |
| 264 } | |
| 265 | |
| 266 void NonTieredCompPolicy::reprofile(ScopeDesc* trap_scope, bool is_osr) { | |
| 267 ScopeDesc* sd = trap_scope; | |
| 268 for (; !sd->is_top(); sd = sd->sender()) { | |
| 269 // Reset ICs of inlined methods, since they can trigger compilations also. | |
| 270 sd->method()->invocation_counter()->reset(); | |
| 271 } | |
| 272 InvocationCounter* c = sd->method()->invocation_counter(); | |
| 273 if (is_osr) { | |
| 274 // It was an OSR method, so bump the count higher. | |
| 275 c->set(c->state(), CompileThreshold); | |
| 276 } else { | |
| 277 c->reset(); | |
| 278 } | |
| 279 sd->method()->backedge_counter()->reset(); | |
| 280 } | |
| 281 | |
| 282 // This method can be called by any component of the runtime to notify the policy | |
| 283 // that it's recommended to delay the complation of this method. | |
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284 void NonTieredCompPolicy::delay_compilation(Method* method) { |
| 1783 | 285 method->invocation_counter()->decay(); |
| 286 method->backedge_counter()->decay(); | |
| 287 } | |
| 288 | |
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289 void NonTieredCompPolicy::disable_compilation(Method* method) { |
| 1783 | 290 method->invocation_counter()->set_state(InvocationCounter::wait_for_nothing); |
| 291 method->backedge_counter()->set_state(InvocationCounter::wait_for_nothing); | |
| 292 } | |
| 293 | |
| 294 CompileTask* NonTieredCompPolicy::select_task(CompileQueue* compile_queue) { | |
| 295 return compile_queue->first(); | |
| 296 } | |
| 297 | |
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298 bool NonTieredCompPolicy::is_mature(Method* method) { |
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299 MethodData* mdo = method->method_data(); |
| 1783 | 300 assert(mdo != NULL, "Should be"); |
| 301 uint current = mdo->mileage_of(method); | |
| 302 uint initial = mdo->creation_mileage(); | |
| 303 if (current < initial) | |
| 304 return true; // some sort of overflow | |
| 305 uint target; | |
| 306 if (ProfileMaturityPercentage <= 0) | |
| 307 target = (uint) -ProfileMaturityPercentage; // absolute value | |
| 308 else | |
| 309 target = (uint)( (ProfileMaturityPercentage * CompileThreshold) / 100 ); | |
| 310 return (current >= initial + target); | |
| 311 } | |
| 312 | |
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313 nmethod* NonTieredCompPolicy::event(methodHandle method, methodHandle inlinee, int branch_bci, |
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314 int bci, CompLevel comp_level, nmethod* nm, JavaThread* thread) { |
| 1783 | 315 assert(comp_level == CompLevel_none, "This should be only called from the interpreter"); |
| 316 NOT_PRODUCT(trace_frequency_counter_overflow(method, branch_bci, bci)); | |
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317 if (JvmtiExport::can_post_interpreter_events() && thread->is_interp_only_mode()) { |
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318 // If certain JVMTI events (e.g. frame pop event) are requested then the |
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319 // thread is forced to remain in interpreted code. This is |
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320 // implemented partly by a check in the run_compiled_code |
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321 // section of the interpreter whether we should skip running |
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322 // compiled code, and partly by skipping OSR compiles for |
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323 // interpreted-only threads. |
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324 if (bci != InvocationEntryBci) { |
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325 reset_counter_for_back_branch_event(method); |
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326 return NULL; |
| 1783 | 327 } |
| 328 } | |
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329 if (CompileTheWorld || ReplayCompiles) { |
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330 // Don't trigger other compiles in testing mode |
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331 if (bci == InvocationEntryBci) { |
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332 reset_counter_for_invocation_event(method); |
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333 } else { |
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334 reset_counter_for_back_branch_event(method); |
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335 } |
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336 return NULL; |
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337 } |
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338 |
| 1783 | 339 if (bci == InvocationEntryBci) { |
| 340 // when code cache is full, compilation gets switched off, UseCompiler | |
| 341 // is set to false | |
| 342 if (!method->has_compiled_code() && UseCompiler) { | |
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343 method_invocation_event(method, thread); |
| 1783 | 344 } else { |
| 345 // Force counter overflow on method entry, even if no compilation | |
| 346 // happened. (The method_invocation_event call does this also.) | |
| 347 reset_counter_for_invocation_event(method); | |
| 348 } | |
| 349 // compilation at an invocation overflow no longer goes and retries test for | |
| 350 // compiled method. We always run the loser of the race as interpreted. | |
| 351 // so return NULL | |
| 352 return NULL; | |
| 353 } else { | |
| 354 // counter overflow in a loop => try to do on-stack-replacement | |
| 355 nmethod* osr_nm = method->lookup_osr_nmethod_for(bci, CompLevel_highest_tier, true); | |
| 356 NOT_PRODUCT(trace_osr_request(method, osr_nm, bci)); | |
| 357 // when code cache is full, we should not compile any more... | |
| 358 if (osr_nm == NULL && UseCompiler) { | |
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359 method_back_branch_event(method, bci, thread); |
| 1783 | 360 osr_nm = method->lookup_osr_nmethod_for(bci, CompLevel_highest_tier, true); |
| 361 } | |
| 362 if (osr_nm == NULL) { | |
| 363 reset_counter_for_back_branch_event(method); | |
| 364 return NULL; | |
| 365 } | |
| 366 return osr_nm; | |
| 367 } | |
| 368 return NULL; | |
| 369 } | |
| 370 | |
| 371 #ifndef PRODUCT | |
| 372 void NonTieredCompPolicy::trace_frequency_counter_overflow(methodHandle m, int branch_bci, int bci) { | |
| 373 if (TraceInvocationCounterOverflow) { | |
| 374 InvocationCounter* ic = m->invocation_counter(); | |
| 375 InvocationCounter* bc = m->backedge_counter(); | |
| 376 ResourceMark rm; | |
| 377 const char* msg = | |
| 378 bci == InvocationEntryBci | |
| 379 ? "comp-policy cntr ovfl @ %d in entry of " | |
| 380 : "comp-policy cntr ovfl @ %d in loop of "; | |
| 381 tty->print(msg, bci); | |
| 382 m->print_value(); | |
| 383 tty->cr(); | |
| 384 ic->print(); | |
| 385 bc->print(); | |
| 386 if (ProfileInterpreter) { | |
| 387 if (bci != InvocationEntryBci) { | |
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388 MethodData* mdo = m->method_data(); |
| 1783 | 389 if (mdo != NULL) { |
| 390 int count = mdo->bci_to_data(branch_bci)->as_JumpData()->taken(); | |
| 391 tty->print_cr("back branch count = %d", count); | |
| 392 } | |
| 393 } | |
| 394 } | |
| 395 } | |
| 396 } | |
| 397 | |
| 398 void NonTieredCompPolicy::trace_osr_request(methodHandle method, nmethod* osr, int bci) { | |
| 399 if (TraceOnStackReplacement) { | |
| 400 ResourceMark rm; | |
| 401 tty->print(osr != NULL ? "Reused OSR entry for " : "Requesting OSR entry for "); | |
| 402 method->print_short_name(tty); | |
| 403 tty->print_cr(" at bci %d", bci); | |
| 404 } | |
| 405 } | |
| 406 #endif // !PRODUCT | |
| 407 | |
| 0 | 408 // SimpleCompPolicy - compile current method |
| 409 | |
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410 void SimpleCompPolicy::method_invocation_event(methodHandle m, JavaThread* thread) { |
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411 const int comp_level = CompLevel_highest_tier; |
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412 const int hot_count = m->invocation_count(); |
| 0 | 413 reset_counter_for_invocation_event(m); |
| 414 const char* comment = "count"; | |
| 415 | |
| 1783 | 416 if (is_compilation_enabled() && can_be_compiled(m)) { |
| 0 | 417 nmethod* nm = m->code(); |
| 418 if (nm == NULL ) { | |
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419 CompileBroker::compile_method(m, InvocationEntryBci, comp_level, m, hot_count, comment, thread); |
| 0 | 420 } |
| 421 } | |
| 422 } | |
| 423 | |
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424 void SimpleCompPolicy::method_back_branch_event(methodHandle m, int bci, JavaThread* thread) { |
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425 const int comp_level = CompLevel_highest_tier; |
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426 const int hot_count = m->backedge_count(); |
| 0 | 427 const char* comment = "backedge_count"; |
| 428 | |
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429 if (is_compilation_enabled() && !m->is_not_osr_compilable(comp_level) && can_be_compiled(m)) { |
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430 CompileBroker::compile_method(m, bci, comp_level, m, hot_count, comment, thread); |
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431 NOT_PRODUCT(trace_osr_completion(m->lookup_osr_nmethod_for(bci, comp_level, true));) |
| 0 | 432 } |
| 433 } | |
| 434 // StackWalkCompPolicy - walk up stack to find a suitable method to compile | |
| 435 | |
| 436 #ifdef COMPILER2 | |
| 437 const char* StackWalkCompPolicy::_msg = NULL; | |
| 438 | |
| 439 | |
| 440 // Consider m for compilation | |
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441 void StackWalkCompPolicy::method_invocation_event(methodHandle m, JavaThread* thread) { |
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442 const int comp_level = CompLevel_highest_tier; |
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443 const int hot_count = m->invocation_count(); |
| 0 | 444 reset_counter_for_invocation_event(m); |
| 445 const char* comment = "count"; | |
| 446 | |
| 1783 | 447 if (is_compilation_enabled() && m->code() == NULL && can_be_compiled(m)) { |
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448 ResourceMark rm(thread); |
| 0 | 449 frame fr = thread->last_frame(); |
| 450 assert(fr.is_interpreted_frame(), "must be interpreted"); | |
| 451 assert(fr.interpreter_frame_method() == m(), "bad method"); | |
| 452 | |
| 453 if (TraceCompilationPolicy) { | |
| 454 tty->print("method invocation trigger: "); | |
| 455 m->print_short_name(tty); | |
| 456 tty->print(" ( interpreted " INTPTR_FORMAT ", size=%d ) ", (address)m(), m->code_size()); | |
| 457 } | |
| 458 RegisterMap reg_map(thread, false); | |
| 459 javaVFrame* triggerVF = thread->last_java_vframe(®_map); | |
| 460 // triggerVF is the frame that triggered its counter | |
| 461 RFrame* first = new InterpretedRFrame(triggerVF->fr(), thread, m); | |
| 462 | |
| 463 if (first->top_method()->code() != NULL) { | |
| 464 // called obsolete method/nmethod -- no need to recompile | |
| 465 if (TraceCompilationPolicy) tty->print_cr(" --> " INTPTR_FORMAT, first->top_method()->code()); | |
| 466 } else { | |
| 467 if (TimeCompilationPolicy) accumulated_time()->start(); | |
| 468 GrowableArray<RFrame*>* stack = new GrowableArray<RFrame*>(50); | |
| 469 stack->push(first); | |
| 470 RFrame* top = findTopInlinableFrame(stack); | |
| 471 if (TimeCompilationPolicy) accumulated_time()->stop(); | |
| 472 assert(top != NULL, "findTopInlinableFrame returned null"); | |
| 473 if (TraceCompilationPolicy) top->print(); | |
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474 CompileBroker::compile_method(top->top_method(), InvocationEntryBci, comp_level, |
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475 m, hot_count, comment, thread); |
| 0 | 476 } |
| 477 } | |
| 478 } | |
| 479 | |
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480 void StackWalkCompPolicy::method_back_branch_event(methodHandle m, int bci, JavaThread* thread) { |
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481 const int comp_level = CompLevel_highest_tier; |
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482 const int hot_count = m->backedge_count(); |
| 0 | 483 const char* comment = "backedge_count"; |
| 484 | |
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485 if (is_compilation_enabled() && !m->is_not_osr_compilable(comp_level) && can_be_compiled(m)) { |
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486 CompileBroker::compile_method(m, bci, comp_level, m, hot_count, comment, thread); |
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487 NOT_PRODUCT(trace_osr_completion(m->lookup_osr_nmethod_for(bci, comp_level, true));) |
| 0 | 488 } |
| 489 } | |
| 490 | |
| 491 RFrame* StackWalkCompPolicy::findTopInlinableFrame(GrowableArray<RFrame*>* stack) { | |
| 492 // go up the stack until finding a frame that (probably) won't be inlined | |
| 493 // into its caller | |
| 494 RFrame* current = stack->at(0); // current choice for stopping | |
| 495 assert( current && !current->is_compiled(), "" ); | |
| 496 const char* msg = NULL; | |
| 497 | |
| 498 while (1) { | |
| 499 | |
| 500 // before going up the stack further, check if doing so would get us into | |
| 501 // compiled code | |
| 502 RFrame* next = senderOf(current, stack); | |
| 503 if( !next ) // No next frame up the stack? | |
| 504 break; // Then compile with current frame | |
| 505 | |
| 506 methodHandle m = current->top_method(); | |
| 507 methodHandle next_m = next->top_method(); | |
| 508 | |
| 509 if (TraceCompilationPolicy && Verbose) { | |
| 510 tty->print("[caller: "); | |
| 511 next_m->print_short_name(tty); | |
| 512 tty->print("] "); | |
| 513 } | |
| 514 | |
| 515 if( !Inline ) { // Inlining turned off | |
| 516 msg = "Inlining turned off"; | |
| 517 break; | |
| 518 } | |
| 519 if (next_m->is_not_compilable()) { // Did fail to compile this before/ | |
| 520 msg = "caller not compilable"; | |
| 521 break; | |
| 522 } | |
| 523 if (next->num() > MaxRecompilationSearchLength) { | |
| 524 // don't go up too high when searching for recompilees | |
| 525 msg = "don't go up any further: > MaxRecompilationSearchLength"; | |
| 526 break; | |
| 527 } | |
| 528 if (next->distance() > MaxInterpretedSearchLength) { | |
| 529 // don't go up too high when searching for recompilees | |
| 530 msg = "don't go up any further: next > MaxInterpretedSearchLength"; | |
| 531 break; | |
| 532 } | |
| 533 // Compiled frame above already decided not to inline; | |
| 534 // do not recompile him. | |
| 535 if (next->is_compiled()) { | |
| 536 msg = "not going up into optimized code"; | |
| 537 break; | |
| 538 } | |
| 539 | |
| 540 // Interpreted frame above us was already compiled. Do not force | |
| 541 // a recompile, although if the frame above us runs long enough an | |
| 542 // OSR might still happen. | |
| 543 if( current->is_interpreted() && next_m->has_compiled_code() ) { | |
| 544 msg = "not going up -- already compiled caller"; | |
| 545 break; | |
| 546 } | |
| 547 | |
| 548 // Compute how frequent this call site is. We have current method 'm'. | |
| 549 // We know next method 'next_m' is interpreted. Find the call site and | |
| 550 // check the various invocation counts. | |
| 551 int invcnt = 0; // Caller counts | |
| 552 if (ProfileInterpreter) { | |
| 553 invcnt = next_m->interpreter_invocation_count(); | |
| 554 } | |
| 555 int cnt = 0; // Call site counts | |
| 556 if (ProfileInterpreter && next_m->method_data() != NULL) { | |
| 557 ResourceMark rm; | |
| 558 int bci = next->top_vframe()->bci(); | |
| 559 ProfileData* data = next_m->method_data()->bci_to_data(bci); | |
| 560 if (data != NULL && data->is_CounterData()) | |
| 561 cnt = data->as_CounterData()->count(); | |
| 562 } | |
| 563 | |
| 564 // Caller counts / call-site counts; i.e. is this call site | |
| 565 // a hot call site for method next_m? | |
| 566 int freq = (invcnt) ? cnt/invcnt : cnt; | |
| 567 | |
| 568 // Check size and frequency limits | |
| 569 if ((msg = shouldInline(m, freq, cnt)) != NULL) { | |
| 570 break; | |
| 571 } | |
| 572 // Check inlining negative tests | |
| 573 if ((msg = shouldNotInline(m)) != NULL) { | |
| 574 break; | |
| 575 } | |
| 576 | |
| 577 | |
| 578 // If the caller method is too big or something then we do not want to | |
| 579 // compile it just to inline a method | |
| 1783 | 580 if (!can_be_compiled(next_m)) { |
| 0 | 581 msg = "caller cannot be compiled"; |
| 582 break; | |
| 583 } | |
| 584 | |
| 585 if( next_m->name() == vmSymbols::class_initializer_name() ) { | |
| 586 msg = "do not compile class initializer (OSR ok)"; | |
| 587 break; | |
| 588 } | |
| 589 | |
| 590 if (TraceCompilationPolicy && Verbose) { | |
| 591 tty->print("\n\t check caller: "); | |
| 592 next_m->print_short_name(tty); | |
| 593 tty->print(" ( interpreted " INTPTR_FORMAT ", size=%d ) ", (address)next_m(), next_m->code_size()); | |
| 594 } | |
| 595 | |
| 596 current = next; | |
| 597 } | |
| 598 | |
| 599 assert( !current || !current->is_compiled(), "" ); | |
| 600 | |
| 601 if (TraceCompilationPolicy && msg) tty->print("(%s)\n", msg); | |
| 602 | |
| 603 return current; | |
| 604 } | |
| 605 | |
| 606 RFrame* StackWalkCompPolicy::senderOf(RFrame* rf, GrowableArray<RFrame*>* stack) { | |
| 607 RFrame* sender = rf->caller(); | |
| 608 if (sender && sender->num() == stack->length()) stack->push(sender); | |
| 609 return sender; | |
| 610 } | |
| 611 | |
| 612 | |
| 613 const char* StackWalkCompPolicy::shouldInline(methodHandle m, float freq, int cnt) { | |
| 614 // Allows targeted inlining | |
| 615 // positive filter: should send be inlined? returns NULL (--> yes) | |
| 616 // or rejection msg | |
| 617 int max_size = MaxInlineSize; | |
| 618 int cost = m->code_size(); | |
| 619 | |
| 620 // Check for too many throws (and not too huge) | |
| 621 if (m->interpreter_throwout_count() > InlineThrowCount && cost < InlineThrowMaxSize ) { | |
| 622 return NULL; | |
| 623 } | |
| 624 | |
| 625 // bump the max size if the call is frequent | |
| 626 if ((freq >= InlineFrequencyRatio) || (cnt >= InlineFrequencyCount)) { | |
| 627 if (TraceFrequencyInlining) { | |
| 628 tty->print("(Inlined frequent method)\n"); | |
| 629 m->print(); | |
| 630 } | |
| 631 max_size = FreqInlineSize; | |
| 632 } | |
| 633 if (cost > max_size) { | |
| 634 return (_msg = "too big"); | |
| 635 } | |
| 636 return NULL; | |
| 637 } | |
| 638 | |
| 639 | |
| 640 const char* StackWalkCompPolicy::shouldNotInline(methodHandle m) { | |
| 641 // negative filter: should send NOT be inlined? returns NULL (--> inline) or rejection msg | |
| 642 if (m->is_abstract()) return (_msg = "abstract method"); | |
| 643 // note: we allow ik->is_abstract() | |
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644 if (!m->method_holder()->is_initialized()) return (_msg = "method holder not initialized"); |
| 0 | 645 if (m->is_native()) return (_msg = "native method"); |
| 646 nmethod* m_code = m->code(); | |
| 1748 | 647 if (m_code != NULL && m_code->code_size() > InlineSmallCode) |
| 0 | 648 return (_msg = "already compiled into a big method"); |
| 649 | |
| 650 // use frequency-based objections only for non-trivial methods | |
| 651 if (m->code_size() <= MaxTrivialSize) return NULL; | |
| 652 if (UseInterpreter) { // don't use counts with -Xcomp | |
| 653 if ((m->code() == NULL) && m->was_never_executed()) return (_msg = "never executed"); | |
| 654 if (!m->was_executed_more_than(MIN2(MinInliningThreshold, CompileThreshold >> 1))) return (_msg = "executed < MinInliningThreshold times"); | |
| 655 } | |
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656 if (Method::has_unloaded_classes_in_signature(m, JavaThread::current())) return (_msg = "unloaded signature classes"); |
| 0 | 657 |
| 658 return NULL; | |
| 659 } | |
| 660 | |
| 661 | |
| 662 | |
| 663 #endif // COMPILER2 |