Mercurial > hg > truffle
annotate src/share/vm/runtime/compilationPolicy.cpp @ 12073:f99558245e5c
8022832: Add WB APIs for OSR compilation
Reviewed-by: kvn
| author | iignatyev |
|---|---|
| date | Wed, 14 Aug 2013 23:50:23 +0400 |
| parents | d1c9384eecb4 |
| children | cefad50507d8 63a4eb8bcd23 7150b16fda52 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2000, 2013, 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) { |
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112 // allow any levels for WhiteBox |
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113 assert(WhiteBoxAPI || comp_level == CompLevel_all || is_compile(comp_level), "illegal compilation level"); |
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114 |
| 0 | 115 if (m->is_abstract()) return false; |
| 116 if (DontCompileHugeMethods && m->code_size() > HugeMethodLimit) return false; | |
| 117 | |
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118 // Math intrinsics should never be compiled as this can lead to |
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119 // monotonicity problems because the interpreter will prefer the |
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120 // compiled code to the intrinsic version. This can't happen in |
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121 // production because the invocation counter can't be incremented |
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122 // but we shouldn't expose the system to this problem in testing |
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123 // modes. |
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124 if (!AbstractInterpreter::can_be_compiled(m)) { |
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125 return false; |
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126 } |
| 1783 | 127 if (comp_level == CompLevel_all) { |
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128 if (TieredCompilation) { |
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129 // enough to be compilable at any level for tiered |
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130 return !m->is_not_compilable(CompLevel_simple) || !m->is_not_compilable(CompLevel_full_optimization); |
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131 } else { |
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132 // must be compilable at available level for non-tiered |
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133 return !m->is_not_compilable(CompLevel_highest_tier); |
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134 } |
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135 } else if (is_compile(comp_level)) { |
| 1783 | 136 return !m->is_not_compilable(comp_level); |
| 137 } | |
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138 return false; |
| 1783 | 139 } |
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140 |
| 12073 | 141 // Returns true if m is allowed to be osr compiled |
| 142 bool CompilationPolicy::can_be_osr_compiled(methodHandle m, int comp_level) { | |
| 143 bool result = false; | |
| 144 if (comp_level == CompLevel_all) { | |
| 145 if (TieredCompilation) { | |
| 146 // enough to be osr compilable at any level for tiered | |
| 147 result = !m->is_not_osr_compilable(CompLevel_simple) || !m->is_not_osr_compilable(CompLevel_full_optimization); | |
| 148 } else { | |
| 149 // must be osr compilable at available level for non-tiered | |
| 150 result = !m->is_not_osr_compilable(CompLevel_highest_tier); | |
| 151 } | |
| 152 } else if (is_compile(comp_level)) { | |
| 153 result = !m->is_not_osr_compilable(comp_level); | |
| 154 } | |
| 155 return (result && can_be_compiled(m, comp_level)); | |
| 156 } | |
| 157 | |
| 1783 | 158 bool CompilationPolicy::is_compilation_enabled() { |
| 159 // NOTE: CompileBroker::should_compile_new_jobs() checks for UseCompiler | |
| 160 return !delay_compilation_during_startup() && CompileBroker::should_compile_new_jobs(); | |
| 0 | 161 } |
| 162 | |
| 163 #ifndef PRODUCT | |
| 164 void CompilationPolicy::print_time() { | |
| 165 tty->print_cr ("Accumulated compilationPolicy times:"); | |
| 166 tty->print_cr ("---------------------------"); | |
| 167 tty->print_cr (" Total: %3.3f sec.", _accumulated_time.seconds()); | |
| 168 } | |
| 169 | |
| 1783 | 170 void NonTieredCompPolicy::trace_osr_completion(nmethod* osr_nm) { |
| 0 | 171 if (TraceOnStackReplacement) { |
| 172 if (osr_nm == NULL) tty->print_cr("compilation failed"); | |
| 173 else tty->print_cr("nmethod " INTPTR_FORMAT, osr_nm); | |
| 174 } | |
| 175 } | |
| 176 #endif // !PRODUCT | |
| 177 | |
| 1783 | 178 void NonTieredCompPolicy::initialize() { |
| 179 // Setup the compiler thread numbers | |
| 180 if (CICompilerCountPerCPU) { | |
| 181 // Example: if CICompilerCountPerCPU is true, then we get | |
| 182 // max(log2(8)-1,1) = 2 compiler threads on an 8-way machine. | |
| 183 // May help big-app startup time. | |
| 184 _compiler_count = MAX2(log2_intptr(os::active_processor_count())-1,1); | |
| 185 } else { | |
| 186 _compiler_count = CICompilerCount; | |
| 187 } | |
| 188 } | |
| 189 | |
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190 // Note: this policy is used ONLY if TieredCompilation is off. |
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191 // compiler_count() behaves the following way: |
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192 // - with TIERED build (with both COMPILER1 and COMPILER2 defined) it should return |
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193 // zero for the c1 compilation levels, hence the particular ordering of the |
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194 // statements. |
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195 // - the same should happen when COMPILER2 is defined and COMPILER1 is not |
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196 // (server build without TIERED defined). |
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197 // - if only COMPILER1 is defined (client build), zero should be returned for |
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198 // the c2 level. |
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199 // - if neither is defined - always return zero. |
| 1783 | 200 int NonTieredCompPolicy::compiler_count(CompLevel comp_level) { |
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201 assert(!TieredCompilation, "This policy should not be used with TieredCompilation"); |
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202 #ifdef COMPILER2 |
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203 if (is_c2_compile(comp_level)) { |
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204 return _compiler_count; |
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205 } else { |
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206 return 0; |
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207 } |
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208 #endif |
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209 |
| 1783 | 210 #ifdef COMPILER1 |
| 211 if (is_c1_compile(comp_level)) { | |
| 212 return _compiler_count; | |
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213 } else { |
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214 return 0; |
| 1783 | 215 } |
| 216 #endif | |
| 217 | |
| 218 return 0; | |
| 219 } | |
| 220 | |
| 221 void NonTieredCompPolicy::reset_counter_for_invocation_event(methodHandle m) { | |
| 0 | 222 // Make sure invocation and backedge counter doesn't overflow again right away |
| 223 // as would be the case for native methods. | |
| 224 | |
| 225 // BUT also make sure the method doesn't look like it was never executed. | |
| 226 // Set carry bit and reduce counter's value to min(count, CompileThreshold/2). | |
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227 MethodCounters* mcs = m->method_counters(); |
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228 assert(mcs != NULL, "MethodCounters cannot be NULL for profiling"); |
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229 mcs->invocation_counter()->set_carry(); |
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230 mcs->backedge_counter()->set_carry(); |
| 0 | 231 |
| 232 assert(!m->was_never_executed(), "don't reset to 0 -- could be mistaken for never-executed"); | |
| 233 } | |
| 234 | |
| 1783 | 235 void NonTieredCompPolicy::reset_counter_for_back_branch_event(methodHandle m) { |
| 0 | 236 // Delay next back-branch event but pump up invocation counter to triger |
| 237 // whole method compilation. | |
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238 MethodCounters* mcs = m->method_counters(); |
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239 assert(mcs != NULL, "MethodCounters cannot be NULL for profiling"); |
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240 InvocationCounter* i = mcs->invocation_counter(); |
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241 InvocationCounter* b = mcs->backedge_counter(); |
| 0 | 242 |
| 243 // Don't set invocation_counter's value too low otherwise the method will | |
| 244 // look like immature (ic < ~5300) which prevents the inlining based on | |
| 245 // the type profiling. | |
| 246 i->set(i->state(), CompileThreshold); | |
| 247 // Don't reset counter too low - it is used to check if OSR method is ready. | |
| 248 b->set(b->state(), CompileThreshold / 2); | |
| 249 } | |
| 250 | |
| 1783 | 251 // |
| 252 // CounterDecay | |
| 253 // | |
| 254 // Interates through invocation counters and decrements them. This | |
| 255 // is done at each safepoint. | |
| 256 // | |
| 257 class CounterDecay : public AllStatic { | |
| 258 static jlong _last_timestamp; | |
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259 static void do_method(Method* m) { |
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260 MethodCounters* mcs = m->method_counters(); |
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261 if (mcs != NULL) { |
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262 mcs->invocation_counter()->decay(); |
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263 } |
| 1783 | 264 } |
| 265 public: | |
| 266 static void decay(); | |
| 267 static bool is_decay_needed() { | |
| 268 return (os::javaTimeMillis() - _last_timestamp) > CounterDecayMinIntervalLength; | |
| 269 } | |
| 270 }; | |
| 271 | |
| 272 jlong CounterDecay::_last_timestamp = 0; | |
| 273 | |
| 274 void CounterDecay::decay() { | |
| 275 _last_timestamp = os::javaTimeMillis(); | |
| 276 | |
| 277 // This operation is going to be performed only at the end of a safepoint | |
| 278 // and hence GC's will not be going on, all Java mutators are suspended | |
| 279 // at this point and hence SystemDictionary_lock is also not needed. | |
| 280 assert(SafepointSynchronize::is_at_safepoint(), "can only be executed at a safepoint"); | |
| 281 int nclasses = SystemDictionary::number_of_classes(); | |
| 282 double classes_per_tick = nclasses * (CounterDecayMinIntervalLength * 1e-3 / | |
| 283 CounterHalfLifeTime); | |
| 284 for (int i = 0; i < classes_per_tick; i++) { | |
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285 Klass* k = SystemDictionary::try_get_next_class(); |
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286 if (k != NULL && k->oop_is_instance()) { |
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287 InstanceKlass::cast(k)->methods_do(do_method); |
| 1783 | 288 } |
| 289 } | |
| 290 } | |
| 291 | |
| 292 // Called at the end of the safepoint | |
| 293 void NonTieredCompPolicy::do_safepoint_work() { | |
| 294 if(UseCounterDecay && CounterDecay::is_decay_needed()) { | |
| 295 CounterDecay::decay(); | |
| 296 } | |
| 297 } | |
| 298 | |
| 299 void NonTieredCompPolicy::reprofile(ScopeDesc* trap_scope, bool is_osr) { | |
| 300 ScopeDesc* sd = trap_scope; | |
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301 MethodCounters* mcs; |
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302 InvocationCounter* c; |
| 1783 | 303 for (; !sd->is_top(); sd = sd->sender()) { |
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304 mcs = sd->method()->method_counters(); |
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305 if (mcs != NULL) { |
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306 // Reset ICs of inlined methods, since they can trigger compilations also. |
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307 mcs->invocation_counter()->reset(); |
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308 } |
| 1783 | 309 } |
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310 mcs = sd->method()->method_counters(); |
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311 if (mcs != NULL) { |
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312 c = mcs->invocation_counter(); |
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313 if (is_osr) { |
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314 // It was an OSR method, so bump the count higher. |
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315 c->set(c->state(), CompileThreshold); |
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316 } else { |
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317 c->reset(); |
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318 } |
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319 mcs->backedge_counter()->reset(); |
| 1783 | 320 } |
| 321 } | |
| 322 | |
| 323 // This method can be called by any component of the runtime to notify the policy | |
| 324 // that it's recommended to delay the complation of this method. | |
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325 void NonTieredCompPolicy::delay_compilation(Method* method) { |
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326 MethodCounters* mcs = method->method_counters(); |
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327 if (mcs != NULL) { |
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328 mcs->invocation_counter()->decay(); |
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329 mcs->backedge_counter()->decay(); |
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330 } |
| 1783 | 331 } |
| 332 | |
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333 void NonTieredCompPolicy::disable_compilation(Method* method) { |
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334 MethodCounters* mcs = method->method_counters(); |
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335 if (mcs != NULL) { |
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336 mcs->invocation_counter()->set_state(InvocationCounter::wait_for_nothing); |
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337 mcs->backedge_counter()->set_state(InvocationCounter::wait_for_nothing); |
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338 } |
| 1783 | 339 } |
| 340 | |
| 341 CompileTask* NonTieredCompPolicy::select_task(CompileQueue* compile_queue) { | |
| 342 return compile_queue->first(); | |
| 343 } | |
| 344 | |
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345 bool NonTieredCompPolicy::is_mature(Method* method) { |
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346 MethodData* mdo = method->method_data(); |
| 1783 | 347 assert(mdo != NULL, "Should be"); |
| 348 uint current = mdo->mileage_of(method); | |
| 349 uint initial = mdo->creation_mileage(); | |
| 350 if (current < initial) | |
| 351 return true; // some sort of overflow | |
| 352 uint target; | |
| 353 if (ProfileMaturityPercentage <= 0) | |
| 354 target = (uint) -ProfileMaturityPercentage; // absolute value | |
| 355 else | |
| 356 target = (uint)( (ProfileMaturityPercentage * CompileThreshold) / 100 ); | |
| 357 return (current >= initial + target); | |
| 358 } | |
| 359 | |
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360 nmethod* NonTieredCompPolicy::event(methodHandle method, methodHandle inlinee, int branch_bci, |
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361 int bci, CompLevel comp_level, nmethod* nm, JavaThread* thread) { |
| 1783 | 362 assert(comp_level == CompLevel_none, "This should be only called from the interpreter"); |
| 363 NOT_PRODUCT(trace_frequency_counter_overflow(method, branch_bci, bci)); | |
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364 if (JvmtiExport::can_post_interpreter_events() && thread->is_interp_only_mode()) { |
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365 // If certain JVMTI events (e.g. frame pop event) are requested then the |
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366 // thread is forced to remain in interpreted code. This is |
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367 // implemented partly by a check in the run_compiled_code |
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368 // section of the interpreter whether we should skip running |
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369 // compiled code, and partly by skipping OSR compiles for |
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370 // interpreted-only threads. |
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371 if (bci != InvocationEntryBci) { |
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372 reset_counter_for_back_branch_event(method); |
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373 return NULL; |
| 1783 | 374 } |
| 375 } | |
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376 if (CompileTheWorld || ReplayCompiles) { |
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377 // Don't trigger other compiles in testing mode |
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378 if (bci == InvocationEntryBci) { |
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379 reset_counter_for_invocation_event(method); |
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380 } else { |
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381 reset_counter_for_back_branch_event(method); |
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382 } |
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383 return NULL; |
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384 } |
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385 |
| 1783 | 386 if (bci == InvocationEntryBci) { |
| 387 // when code cache is full, compilation gets switched off, UseCompiler | |
| 388 // is set to false | |
| 389 if (!method->has_compiled_code() && UseCompiler) { | |
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390 method_invocation_event(method, thread); |
| 1783 | 391 } else { |
| 392 // Force counter overflow on method entry, even if no compilation | |
| 393 // happened. (The method_invocation_event call does this also.) | |
| 394 reset_counter_for_invocation_event(method); | |
| 395 } | |
| 396 // compilation at an invocation overflow no longer goes and retries test for | |
| 397 // compiled method. We always run the loser of the race as interpreted. | |
| 398 // so return NULL | |
| 399 return NULL; | |
| 400 } else { | |
| 401 // counter overflow in a loop => try to do on-stack-replacement | |
| 402 nmethod* osr_nm = method->lookup_osr_nmethod_for(bci, CompLevel_highest_tier, true); | |
| 403 NOT_PRODUCT(trace_osr_request(method, osr_nm, bci)); | |
| 404 // when code cache is full, we should not compile any more... | |
| 405 if (osr_nm == NULL && UseCompiler) { | |
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406 method_back_branch_event(method, bci, thread); |
| 1783 | 407 osr_nm = method->lookup_osr_nmethod_for(bci, CompLevel_highest_tier, true); |
| 408 } | |
| 409 if (osr_nm == NULL) { | |
| 410 reset_counter_for_back_branch_event(method); | |
| 411 return NULL; | |
| 412 } | |
| 413 return osr_nm; | |
| 414 } | |
| 415 return NULL; | |
| 416 } | |
| 417 | |
| 418 #ifndef PRODUCT | |
| 419 void NonTieredCompPolicy::trace_frequency_counter_overflow(methodHandle m, int branch_bci, int bci) { | |
| 420 if (TraceInvocationCounterOverflow) { | |
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421 MethodCounters* mcs = m->method_counters(); |
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422 assert(mcs != NULL, "MethodCounters cannot be NULL for profiling"); |
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423 InvocationCounter* ic = mcs->invocation_counter(); |
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424 InvocationCounter* bc = mcs->backedge_counter(); |
| 1783 | 425 ResourceMark rm; |
| 426 const char* msg = | |
| 427 bci == InvocationEntryBci | |
| 428 ? "comp-policy cntr ovfl @ %d in entry of " | |
| 429 : "comp-policy cntr ovfl @ %d in loop of "; | |
| 430 tty->print(msg, bci); | |
| 431 m->print_value(); | |
| 432 tty->cr(); | |
| 433 ic->print(); | |
| 434 bc->print(); | |
| 435 if (ProfileInterpreter) { | |
| 436 if (bci != InvocationEntryBci) { | |
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437 MethodData* mdo = m->method_data(); |
| 1783 | 438 if (mdo != NULL) { |
| 439 int count = mdo->bci_to_data(branch_bci)->as_JumpData()->taken(); | |
| 440 tty->print_cr("back branch count = %d", count); | |
| 441 } | |
| 442 } | |
| 443 } | |
| 444 } | |
| 445 } | |
| 446 | |
| 447 void NonTieredCompPolicy::trace_osr_request(methodHandle method, nmethod* osr, int bci) { | |
| 448 if (TraceOnStackReplacement) { | |
| 449 ResourceMark rm; | |
| 450 tty->print(osr != NULL ? "Reused OSR entry for " : "Requesting OSR entry for "); | |
| 451 method->print_short_name(tty); | |
| 452 tty->print_cr(" at bci %d", bci); | |
| 453 } | |
| 454 } | |
| 455 #endif // !PRODUCT | |
| 456 | |
| 0 | 457 // SimpleCompPolicy - compile current method |
| 458 | |
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459 void SimpleCompPolicy::method_invocation_event(methodHandle m, JavaThread* thread) { |
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460 const int comp_level = CompLevel_highest_tier; |
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461 const int hot_count = m->invocation_count(); |
| 0 | 462 reset_counter_for_invocation_event(m); |
| 463 const char* comment = "count"; | |
| 464 | |
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465 if (is_compilation_enabled() && can_be_compiled(m, comp_level)) { |
| 0 | 466 nmethod* nm = m->code(); |
| 467 if (nm == NULL ) { | |
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468 CompileBroker::compile_method(m, InvocationEntryBci, comp_level, m, hot_count, comment, thread); |
| 0 | 469 } |
| 470 } | |
| 471 } | |
| 472 | |
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473 void SimpleCompPolicy::method_back_branch_event(methodHandle m, int bci, JavaThread* thread) { |
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474 const int comp_level = CompLevel_highest_tier; |
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475 const int hot_count = m->backedge_count(); |
| 0 | 476 const char* comment = "backedge_count"; |
| 477 | |
| 12073 | 478 if (is_compilation_enabled() && can_be_osr_compiled(m, comp_level)) { |
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479 CompileBroker::compile_method(m, bci, comp_level, m, hot_count, comment, thread); |
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480 NOT_PRODUCT(trace_osr_completion(m->lookup_osr_nmethod_for(bci, comp_level, true));) |
| 0 | 481 } |
| 482 } | |
| 483 // StackWalkCompPolicy - walk up stack to find a suitable method to compile | |
| 484 | |
| 485 #ifdef COMPILER2 | |
| 486 const char* StackWalkCompPolicy::_msg = NULL; | |
| 487 | |
| 488 | |
| 489 // Consider m for compilation | |
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490 void StackWalkCompPolicy::method_invocation_event(methodHandle m, JavaThread* thread) { |
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491 const int comp_level = CompLevel_highest_tier; |
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492 const int hot_count = m->invocation_count(); |
| 0 | 493 reset_counter_for_invocation_event(m); |
| 494 const char* comment = "count"; | |
| 495 | |
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496 if (is_compilation_enabled() && m->code() == NULL && can_be_compiled(m, comp_level)) { |
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497 ResourceMark rm(thread); |
| 0 | 498 frame fr = thread->last_frame(); |
| 499 assert(fr.is_interpreted_frame(), "must be interpreted"); | |
| 500 assert(fr.interpreter_frame_method() == m(), "bad method"); | |
| 501 | |
| 502 if (TraceCompilationPolicy) { | |
| 503 tty->print("method invocation trigger: "); | |
| 504 m->print_short_name(tty); | |
| 505 tty->print(" ( interpreted " INTPTR_FORMAT ", size=%d ) ", (address)m(), m->code_size()); | |
| 506 } | |
| 507 RegisterMap reg_map(thread, false); | |
| 508 javaVFrame* triggerVF = thread->last_java_vframe(®_map); | |
| 509 // triggerVF is the frame that triggered its counter | |
| 510 RFrame* first = new InterpretedRFrame(triggerVF->fr(), thread, m); | |
| 511 | |
| 512 if (first->top_method()->code() != NULL) { | |
| 513 // called obsolete method/nmethod -- no need to recompile | |
| 514 if (TraceCompilationPolicy) tty->print_cr(" --> " INTPTR_FORMAT, first->top_method()->code()); | |
| 515 } else { | |
| 516 if (TimeCompilationPolicy) accumulated_time()->start(); | |
| 517 GrowableArray<RFrame*>* stack = new GrowableArray<RFrame*>(50); | |
| 518 stack->push(first); | |
| 519 RFrame* top = findTopInlinableFrame(stack); | |
| 520 if (TimeCompilationPolicy) accumulated_time()->stop(); | |
| 521 assert(top != NULL, "findTopInlinableFrame returned null"); | |
| 522 if (TraceCompilationPolicy) top->print(); | |
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523 CompileBroker::compile_method(top->top_method(), InvocationEntryBci, comp_level, |
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524 m, hot_count, comment, thread); |
| 0 | 525 } |
| 526 } | |
| 527 } | |
| 528 | |
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529 void StackWalkCompPolicy::method_back_branch_event(methodHandle m, int bci, JavaThread* thread) { |
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530 const int comp_level = CompLevel_highest_tier; |
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531 const int hot_count = m->backedge_count(); |
| 0 | 532 const char* comment = "backedge_count"; |
| 533 | |
| 12073 | 534 if (is_compilation_enabled() && can_be_osr_compiled(m, comp_level)) { |
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535 CompileBroker::compile_method(m, bci, comp_level, m, hot_count, comment, thread); |
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536 NOT_PRODUCT(trace_osr_completion(m->lookup_osr_nmethod_for(bci, comp_level, true));) |
| 0 | 537 } |
| 538 } | |
| 539 | |
| 540 RFrame* StackWalkCompPolicy::findTopInlinableFrame(GrowableArray<RFrame*>* stack) { | |
| 541 // go up the stack until finding a frame that (probably) won't be inlined | |
| 542 // into its caller | |
| 543 RFrame* current = stack->at(0); // current choice for stopping | |
| 544 assert( current && !current->is_compiled(), "" ); | |
| 545 const char* msg = NULL; | |
| 546 | |
| 547 while (1) { | |
| 548 | |
| 549 // before going up the stack further, check if doing so would get us into | |
| 550 // compiled code | |
| 551 RFrame* next = senderOf(current, stack); | |
| 552 if( !next ) // No next frame up the stack? | |
| 553 break; // Then compile with current frame | |
| 554 | |
| 555 methodHandle m = current->top_method(); | |
| 556 methodHandle next_m = next->top_method(); | |
| 557 | |
| 558 if (TraceCompilationPolicy && Verbose) { | |
| 559 tty->print("[caller: "); | |
| 560 next_m->print_short_name(tty); | |
| 561 tty->print("] "); | |
| 562 } | |
| 563 | |
| 564 if( !Inline ) { // Inlining turned off | |
| 565 msg = "Inlining turned off"; | |
| 566 break; | |
| 567 } | |
| 568 if (next_m->is_not_compilable()) { // Did fail to compile this before/ | |
| 569 msg = "caller not compilable"; | |
| 570 break; | |
| 571 } | |
| 572 if (next->num() > MaxRecompilationSearchLength) { | |
| 573 // don't go up too high when searching for recompilees | |
| 574 msg = "don't go up any further: > MaxRecompilationSearchLength"; | |
| 575 break; | |
| 576 } | |
| 577 if (next->distance() > MaxInterpretedSearchLength) { | |
| 578 // don't go up too high when searching for recompilees | |
| 579 msg = "don't go up any further: next > MaxInterpretedSearchLength"; | |
| 580 break; | |
| 581 } | |
| 582 // Compiled frame above already decided not to inline; | |
| 583 // do not recompile him. | |
| 584 if (next->is_compiled()) { | |
| 585 msg = "not going up into optimized code"; | |
| 586 break; | |
| 587 } | |
| 588 | |
| 589 // Interpreted frame above us was already compiled. Do not force | |
| 590 // a recompile, although if the frame above us runs long enough an | |
| 591 // OSR might still happen. | |
| 592 if( current->is_interpreted() && next_m->has_compiled_code() ) { | |
| 593 msg = "not going up -- already compiled caller"; | |
| 594 break; | |
| 595 } | |
| 596 | |
| 597 // Compute how frequent this call site is. We have current method 'm'. | |
| 598 // We know next method 'next_m' is interpreted. Find the call site and | |
| 599 // check the various invocation counts. | |
| 600 int invcnt = 0; // Caller counts | |
| 601 if (ProfileInterpreter) { | |
| 602 invcnt = next_m->interpreter_invocation_count(); | |
| 603 } | |
| 604 int cnt = 0; // Call site counts | |
| 605 if (ProfileInterpreter && next_m->method_data() != NULL) { | |
| 606 ResourceMark rm; | |
| 607 int bci = next->top_vframe()->bci(); | |
| 608 ProfileData* data = next_m->method_data()->bci_to_data(bci); | |
| 609 if (data != NULL && data->is_CounterData()) | |
| 610 cnt = data->as_CounterData()->count(); | |
| 611 } | |
| 612 | |
| 613 // Caller counts / call-site counts; i.e. is this call site | |
| 614 // a hot call site for method next_m? | |
| 615 int freq = (invcnt) ? cnt/invcnt : cnt; | |
| 616 | |
| 617 // Check size and frequency limits | |
| 618 if ((msg = shouldInline(m, freq, cnt)) != NULL) { | |
| 619 break; | |
| 620 } | |
| 621 // Check inlining negative tests | |
| 622 if ((msg = shouldNotInline(m)) != NULL) { | |
| 623 break; | |
| 624 } | |
| 625 | |
| 626 | |
| 627 // If the caller method is too big or something then we do not want to | |
| 628 // compile it just to inline a method | |
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629 if (!can_be_compiled(next_m, CompLevel_any)) { |
| 0 | 630 msg = "caller cannot be compiled"; |
| 631 break; | |
| 632 } | |
| 633 | |
| 634 if( next_m->name() == vmSymbols::class_initializer_name() ) { | |
| 635 msg = "do not compile class initializer (OSR ok)"; | |
| 636 break; | |
| 637 } | |
| 638 | |
| 639 if (TraceCompilationPolicy && Verbose) { | |
| 640 tty->print("\n\t check caller: "); | |
| 641 next_m->print_short_name(tty); | |
| 642 tty->print(" ( interpreted " INTPTR_FORMAT ", size=%d ) ", (address)next_m(), next_m->code_size()); | |
| 643 } | |
| 644 | |
| 645 current = next; | |
| 646 } | |
| 647 | |
| 648 assert( !current || !current->is_compiled(), "" ); | |
| 649 | |
| 650 if (TraceCompilationPolicy && msg) tty->print("(%s)\n", msg); | |
| 651 | |
| 652 return current; | |
| 653 } | |
| 654 | |
| 655 RFrame* StackWalkCompPolicy::senderOf(RFrame* rf, GrowableArray<RFrame*>* stack) { | |
| 656 RFrame* sender = rf->caller(); | |
| 657 if (sender && sender->num() == stack->length()) stack->push(sender); | |
| 658 return sender; | |
| 659 } | |
| 660 | |
| 661 | |
| 662 const char* StackWalkCompPolicy::shouldInline(methodHandle m, float freq, int cnt) { | |
| 663 // Allows targeted inlining | |
| 664 // positive filter: should send be inlined? returns NULL (--> yes) | |
| 665 // or rejection msg | |
| 666 int max_size = MaxInlineSize; | |
| 667 int cost = m->code_size(); | |
| 668 | |
| 669 // Check for too many throws (and not too huge) | |
| 670 if (m->interpreter_throwout_count() > InlineThrowCount && cost < InlineThrowMaxSize ) { | |
| 671 return NULL; | |
| 672 } | |
| 673 | |
| 674 // bump the max size if the call is frequent | |
| 675 if ((freq >= InlineFrequencyRatio) || (cnt >= InlineFrequencyCount)) { | |
| 676 if (TraceFrequencyInlining) { | |
| 677 tty->print("(Inlined frequent method)\n"); | |
| 678 m->print(); | |
| 679 } | |
| 680 max_size = FreqInlineSize; | |
| 681 } | |
| 682 if (cost > max_size) { | |
| 683 return (_msg = "too big"); | |
| 684 } | |
| 685 return NULL; | |
| 686 } | |
| 687 | |
| 688 | |
| 689 const char* StackWalkCompPolicy::shouldNotInline(methodHandle m) { | |
| 690 // negative filter: should send NOT be inlined? returns NULL (--> inline) or rejection msg | |
| 691 if (m->is_abstract()) return (_msg = "abstract method"); | |
| 692 // note: we allow ik->is_abstract() | |
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693 if (!m->method_holder()->is_initialized()) return (_msg = "method holder not initialized"); |
| 0 | 694 if (m->is_native()) return (_msg = "native method"); |
| 695 nmethod* m_code = m->code(); | |
| 1748 | 696 if (m_code != NULL && m_code->code_size() > InlineSmallCode) |
| 0 | 697 return (_msg = "already compiled into a big method"); |
| 698 | |
| 699 // use frequency-based objections only for non-trivial methods | |
| 700 if (m->code_size() <= MaxTrivialSize) return NULL; | |
| 701 if (UseInterpreter) { // don't use counts with -Xcomp | |
| 702 if ((m->code() == NULL) && m->was_never_executed()) return (_msg = "never executed"); | |
| 703 if (!m->was_executed_more_than(MIN2(MinInliningThreshold, CompileThreshold >> 1))) return (_msg = "executed < MinInliningThreshold times"); | |
| 704 } | |
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705 if (Method::has_unloaded_classes_in_signature(m, JavaThread::current())) return (_msg = "unloaded signature classes"); |
| 0 | 706 |
| 707 return NULL; | |
| 708 } | |
| 709 | |
| 710 | |
| 711 | |
| 712 #endif // COMPILER2 |