Mercurial > hg > truffle
annotate src/share/vm/runtime/compilationPolicy.cpp @ 18125:2a69cbe850a8
Reduce diff with upstream
| author | Gilles Duboscq <duboscq@ssw.jku.at> |
|---|---|
| date | Mon, 20 Oct 2014 19:07:20 +0200 |
| parents | 52b4284cb496 |
| children | 8f2fb6bec986 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2000, 2014, 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" | |
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48 #ifdef GRAAL |
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49 #include "runtime/gpu.hpp" |
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50 #endif |
| 0 | 51 |
| 52 CompilationPolicy* CompilationPolicy::_policy; | |
| 53 elapsedTimer CompilationPolicy::_accumulated_time; | |
| 54 bool CompilationPolicy::_in_vm_startup; | |
| 55 | |
| 56 // Determine compilation policy based on command line argument | |
| 57 void compilationPolicy_init() { | |
| 58 CompilationPolicy::set_in_vm_startup(DelayCompilationDuringStartup); | |
| 59 | |
| 60 switch(CompilationPolicyChoice) { | |
| 61 case 0: | |
| 62 CompilationPolicy::set_policy(new SimpleCompPolicy()); | |
| 63 break; | |
| 64 | |
| 65 case 1: | |
| 66 #ifdef COMPILER2 | |
| 67 CompilationPolicy::set_policy(new StackWalkCompPolicy()); | |
| 68 #else | |
| 69 Unimplemented(); | |
| 70 #endif | |
| 71 break; | |
| 1783 | 72 case 2: |
| 73 #ifdef TIERED | |
| 74 CompilationPolicy::set_policy(new SimpleThresholdPolicy()); | |
| 75 #else | |
| 76 Unimplemented(); | |
| 77 #endif | |
| 78 break; | |
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79 case 3: |
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80 #ifdef TIERED |
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81 CompilationPolicy::set_policy(new AdvancedThresholdPolicy()); |
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82 #else |
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83 Unimplemented(); |
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84 #endif |
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85 break; |
| 0 | 86 default: |
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87 fatal("CompilationPolicyChoice must be in the range: [0-3]"); |
| 0 | 88 } |
| 1783 | 89 CompilationPolicy::policy()->initialize(); |
| 0 | 90 } |
| 91 | |
| 92 void CompilationPolicy::completed_vm_startup() { | |
| 93 if (TraceCompilationPolicy) { | |
| 94 tty->print("CompilationPolicy: completed vm startup.\n"); | |
| 95 } | |
| 96 _in_vm_startup = false; | |
| 97 } | |
| 98 | |
| 99 // Returns true if m must be compiled before executing it | |
| 100 // This is intended to force compiles for methods (usually for | |
| 101 // debugging) that would otherwise be interpreted for some reason. | |
| 1783 | 102 bool CompilationPolicy::must_be_compiled(methodHandle m, int comp_level) { |
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103 // Don't allow Xcomp to cause compiles in replay mode |
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104 if (ReplayCompiles) return false; |
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105 |
| 0 | 106 if (m->has_compiled_code()) return false; // already compiled |
| 1783 | 107 if (!can_be_compiled(m, comp_level)) return false; |
| 0 | 108 |
| 109 return !UseInterpreter || // must compile all methods | |
| 1202 | 110 (UseCompiler && AlwaysCompileLoopMethods && m->has_loops() && CompileBroker::should_compile_new_jobs()); // eagerly compile loop methods |
| 0 | 111 } |
| 112 | |
| 113 // Returns true if m is allowed to be compiled | |
| 1783 | 114 bool CompilationPolicy::can_be_compiled(methodHandle m, int comp_level) { |
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115 // allow any levels for WhiteBox |
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116 assert(WhiteBoxAPI || comp_level == CompLevel_all || is_compile(comp_level), "illegal compilation level"); |
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117 |
| 0 | 118 if (m->is_abstract()) return false; |
| 119 if (DontCompileHugeMethods && m->code_size() > HugeMethodLimit) return false; | |
| 120 | |
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121 // Math intrinsics should never be compiled as this can lead to |
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122 // monotonicity problems because the interpreter will prefer the |
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123 // compiled code to the intrinsic version. This can't happen in |
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124 // production because the invocation counter can't be incremented |
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125 // but we shouldn't expose the system to this problem in testing |
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126 // modes. |
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127 if (!AbstractInterpreter::can_be_compiled(m)) { |
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128 return false; |
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129 } |
| 1783 | 130 if (comp_level == CompLevel_all) { |
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131 if (TieredCompilation) { |
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132 // enough to be compilable at any level for tiered |
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133 return !m->is_not_compilable(CompLevel_simple) || !m->is_not_compilable(CompLevel_full_optimization); |
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134 } else { |
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135 // must be compilable at available level for non-tiered |
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136 return !m->is_not_compilable(CompLevel_highest_tier); |
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137 } |
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138 } else if (is_compile(comp_level)) { |
| 1783 | 139 return !m->is_not_compilable(comp_level); |
| 140 } | |
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141 return false; |
| 1783 | 142 } |
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143 |
| 12073 | 144 // Returns true if m is allowed to be osr compiled |
| 145 bool CompilationPolicy::can_be_osr_compiled(methodHandle m, int comp_level) { | |
| 146 bool result = false; | |
| 147 if (comp_level == CompLevel_all) { | |
| 148 if (TieredCompilation) { | |
| 149 // enough to be osr compilable at any level for tiered | |
| 150 result = !m->is_not_osr_compilable(CompLevel_simple) || !m->is_not_osr_compilable(CompLevel_full_optimization); | |
| 151 } else { | |
| 152 // must be osr compilable at available level for non-tiered | |
| 153 result = !m->is_not_osr_compilable(CompLevel_highest_tier); | |
| 154 } | |
| 155 } else if (is_compile(comp_level)) { | |
| 156 result = !m->is_not_osr_compilable(comp_level); | |
| 157 } | |
| 158 return (result && can_be_compiled(m, comp_level)); | |
| 159 } | |
| 160 | |
| 1783 | 161 bool CompilationPolicy::is_compilation_enabled() { |
| 162 // NOTE: CompileBroker::should_compile_new_jobs() checks for UseCompiler | |
| 163 return !delay_compilation_during_startup() && CompileBroker::should_compile_new_jobs(); | |
| 0 | 164 } |
| 165 | |
| 166 #ifndef PRODUCT | |
| 167 void CompilationPolicy::print_time() { | |
| 168 tty->print_cr ("Accumulated compilationPolicy times:"); | |
| 169 tty->print_cr ("---------------------------"); | |
| 170 tty->print_cr (" Total: %3.3f sec.", _accumulated_time.seconds()); | |
| 171 } | |
| 172 | |
| 1783 | 173 void NonTieredCompPolicy::trace_osr_completion(nmethod* osr_nm) { |
| 0 | 174 if (TraceOnStackReplacement) { |
| 175 if (osr_nm == NULL) tty->print_cr("compilation failed"); | |
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176 else tty->print_cr("nmethod " INTPTR_FORMAT, p2i(osr_nm)); |
| 0 | 177 } |
| 178 } | |
| 179 #endif // !PRODUCT | |
| 180 | |
| 1783 | 181 void NonTieredCompPolicy::initialize() { |
| 182 // Setup the compiler thread numbers | |
| 183 if (CICompilerCountPerCPU) { | |
| 184 // Example: if CICompilerCountPerCPU is true, then we get | |
| 185 // max(log2(8)-1,1) = 2 compiler threads on an 8-way machine. | |
| 186 // May help big-app startup time. | |
| 187 _compiler_count = MAX2(log2_intptr(os::active_processor_count())-1,1); | |
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188 FLAG_SET_ERGO(intx, CICompilerCount, _compiler_count); |
| 1783 | 189 } else { |
| 190 _compiler_count = CICompilerCount; | |
| 191 } | |
| 192 } | |
| 193 | |
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194 // Note: this policy is used ONLY if TieredCompilation is off. |
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195 // compiler_count() behaves the following way: |
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196 // - with TIERED build (with both COMPILER1 and COMPILER2 defined) it should return |
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197 // zero for the c1 compilation levels, hence the particular ordering of the |
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198 // statements. |
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199 // - the same should happen when COMPILER2 is defined and COMPILER1 is not |
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200 // (server build without TIERED defined). |
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201 // - if only COMPILER1 is defined (client build), zero should be returned for |
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202 // the c2 level. |
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203 // - if neither is defined - always return zero. |
| 1783 | 204 int NonTieredCompPolicy::compiler_count(CompLevel comp_level) { |
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205 assert(!TieredCompilation, "This policy should not be used with TieredCompilation"); |
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206 #if defined(COMPILER2) || defined(COMPILERGRAAL) |
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207 if (is_c2_compile(comp_level)) { |
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208 return _compiler_count; |
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209 } else { |
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210 return 0; |
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211 } |
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212 #endif |
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213 |
| 1783 | 214 #ifdef COMPILER1 |
| 215 if (is_c1_compile(comp_level)) { | |
| 216 return _compiler_count; | |
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217 } else { |
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218 return 0; |
| 1783 | 219 } |
| 220 #endif | |
| 221 | |
| 222 return 0; | |
| 223 } | |
| 224 | |
| 225 void NonTieredCompPolicy::reset_counter_for_invocation_event(methodHandle m) { | |
| 0 | 226 // Make sure invocation and backedge counter doesn't overflow again right away |
| 227 // as would be the case for native methods. | |
| 228 | |
| 229 // BUT also make sure the method doesn't look like it was never executed. | |
| 230 // Set carry bit and reduce counter's value to min(count, CompileThreshold/2). | |
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231 MethodCounters* mcs = m->method_counters(); |
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232 assert(mcs != NULL, "MethodCounters cannot be NULL for profiling"); |
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233 mcs->invocation_counter()->set_carry(); |
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234 mcs->backedge_counter()->set_carry(); |
| 0 | 235 |
| 236 assert(!m->was_never_executed(), "don't reset to 0 -- could be mistaken for never-executed"); | |
| 237 } | |
| 238 | |
| 1783 | 239 void NonTieredCompPolicy::reset_counter_for_back_branch_event(methodHandle m) { |
| 0 | 240 // Delay next back-branch event but pump up invocation counter to triger |
| 241 // whole method compilation. | |
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242 MethodCounters* mcs = m->method_counters(); |
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243 assert(mcs != NULL, "MethodCounters cannot be NULL for profiling"); |
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244 InvocationCounter* i = mcs->invocation_counter(); |
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245 InvocationCounter* b = mcs->backedge_counter(); |
| 0 | 246 |
| 247 // Don't set invocation_counter's value too low otherwise the method will | |
| 248 // look like immature (ic < ~5300) which prevents the inlining based on | |
| 249 // the type profiling. | |
| 250 i->set(i->state(), CompileThreshold); | |
| 251 // Don't reset counter too low - it is used to check if OSR method is ready. | |
| 252 b->set(b->state(), CompileThreshold / 2); | |
| 253 } | |
| 254 | |
| 1783 | 255 // |
| 256 // CounterDecay | |
| 257 // | |
| 258 // Interates through invocation counters and decrements them. This | |
| 259 // is done at each safepoint. | |
| 260 // | |
| 261 class CounterDecay : public AllStatic { | |
| 262 static jlong _last_timestamp; | |
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263 static void do_method(Method* m) { |
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264 MethodCounters* mcs = m->method_counters(); |
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265 if (mcs != NULL) { |
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266 mcs->invocation_counter()->decay(); |
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267 } |
| 1783 | 268 } |
| 269 public: | |
| 270 static void decay(); | |
| 271 static bool is_decay_needed() { | |
| 272 return (os::javaTimeMillis() - _last_timestamp) > CounterDecayMinIntervalLength; | |
| 273 } | |
| 274 }; | |
| 275 | |
| 276 jlong CounterDecay::_last_timestamp = 0; | |
| 277 | |
| 278 void CounterDecay::decay() { | |
| 279 _last_timestamp = os::javaTimeMillis(); | |
| 280 | |
| 281 // This operation is going to be performed only at the end of a safepoint | |
| 282 // and hence GC's will not be going on, all Java mutators are suspended | |
| 283 // at this point and hence SystemDictionary_lock is also not needed. | |
| 284 assert(SafepointSynchronize::is_at_safepoint(), "can only be executed at a safepoint"); | |
| 285 int nclasses = SystemDictionary::number_of_classes(); | |
| 286 double classes_per_tick = nclasses * (CounterDecayMinIntervalLength * 1e-3 / | |
| 287 CounterHalfLifeTime); | |
| 288 for (int i = 0; i < classes_per_tick; i++) { | |
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289 Klass* k = SystemDictionary::try_get_next_class(); |
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290 if (k != NULL && k->oop_is_instance()) { |
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291 InstanceKlass::cast(k)->methods_do(do_method); |
| 1783 | 292 } |
| 293 } | |
| 294 } | |
| 295 | |
| 296 // Called at the end of the safepoint | |
| 297 void NonTieredCompPolicy::do_safepoint_work() { | |
| 298 if(UseCounterDecay && CounterDecay::is_decay_needed()) { | |
| 299 CounterDecay::decay(); | |
| 300 } | |
| 301 } | |
| 302 | |
| 303 void NonTieredCompPolicy::reprofile(ScopeDesc* trap_scope, bool is_osr) { | |
| 304 ScopeDesc* sd = trap_scope; | |
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305 MethodCounters* mcs; |
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306 InvocationCounter* c; |
| 1783 | 307 for (; !sd->is_top(); sd = sd->sender()) { |
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308 mcs = sd->method()->method_counters(); |
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309 if (mcs != NULL) { |
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310 // Reset ICs of inlined methods, since they can trigger compilations also. |
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311 mcs->invocation_counter()->reset(); |
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312 } |
| 1783 | 313 } |
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314 mcs = sd->method()->method_counters(); |
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315 if (mcs != NULL) { |
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316 c = mcs->invocation_counter(); |
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317 if (is_osr) { |
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318 // It was an OSR method, so bump the count higher. |
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319 c->set(c->state(), CompileThreshold); |
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320 } else { |
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321 c->reset(); |
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322 } |
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323 mcs->backedge_counter()->reset(); |
| 1783 | 324 } |
| 325 } | |
| 326 | |
| 327 // This method can be called by any component of the runtime to notify the policy | |
| 328 // that it's recommended to delay the complation of this method. | |
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329 void NonTieredCompPolicy::delay_compilation(Method* method) { |
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330 MethodCounters* mcs = method->method_counters(); |
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331 if (mcs != NULL) { |
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332 mcs->invocation_counter()->decay(); |
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333 mcs->backedge_counter()->decay(); |
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334 } |
| 1783 | 335 } |
| 336 | |
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337 void NonTieredCompPolicy::disable_compilation(Method* method) { |
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338 MethodCounters* mcs = method->method_counters(); |
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339 if (mcs != NULL) { |
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340 mcs->invocation_counter()->set_state(InvocationCounter::wait_for_nothing); |
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341 mcs->backedge_counter()->set_state(InvocationCounter::wait_for_nothing); |
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342 } |
| 1783 | 343 } |
| 344 | |
| 345 CompileTask* NonTieredCompPolicy::select_task(CompileQueue* compile_queue) { | |
| 346 return compile_queue->first(); | |
| 347 } | |
| 348 | |
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349 bool NonTieredCompPolicy::is_mature(Method* method) { |
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350 MethodData* mdo = method->method_data(); |
| 1783 | 351 assert(mdo != NULL, "Should be"); |
| 352 uint current = mdo->mileage_of(method); | |
| 353 uint initial = mdo->creation_mileage(); | |
| 354 if (current < initial) | |
| 355 return true; // some sort of overflow | |
| 356 uint target; | |
| 357 if (ProfileMaturityPercentage <= 0) | |
| 358 target = (uint) -ProfileMaturityPercentage; // absolute value | |
| 359 else | |
| 360 target = (uint)( (ProfileMaturityPercentage * CompileThreshold) / 100 ); | |
| 361 return (current >= initial + target); | |
| 362 } | |
| 363 | |
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364 nmethod* NonTieredCompPolicy::event(methodHandle method, methodHandle inlinee, int branch_bci, |
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365 int bci, CompLevel comp_level, nmethod* nm, JavaThread* thread) { |
| 1783 | 366 assert(comp_level == CompLevel_none, "This should be only called from the interpreter"); |
| 367 NOT_PRODUCT(trace_frequency_counter_overflow(method, branch_bci, bci)); | |
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368 if (JvmtiExport::can_post_interpreter_events() && thread->is_interp_only_mode()) { |
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369 // If certain JVMTI events (e.g. frame pop event) are requested then the |
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370 // thread is forced to remain in interpreted code. This is |
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371 // implemented partly by a check in the run_compiled_code |
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372 // section of the interpreter whether we should skip running |
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373 // compiled code, and partly by skipping OSR compiles for |
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374 // interpreted-only threads. |
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375 if (bci != InvocationEntryBci) { |
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376 reset_counter_for_back_branch_event(method); |
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377 return NULL; |
| 1783 | 378 } |
| 379 } | |
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380 if (CompileTheWorld || ReplayCompiles) { |
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381 // Don't trigger other compiles in testing mode |
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382 if (bci == InvocationEntryBci) { |
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383 reset_counter_for_invocation_event(method); |
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384 } else { |
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385 reset_counter_for_back_branch_event(method); |
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386 } |
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387 return NULL; |
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388 } |
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389 |
| 1783 | 390 if (bci == InvocationEntryBci) { |
| 391 // when code cache is full, compilation gets switched off, UseCompiler | |
| 392 // is set to false | |
| 393 if (!method->has_compiled_code() && UseCompiler) { | |
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394 method_invocation_event(method, thread); |
| 1783 | 395 } else { |
| 396 // Force counter overflow on method entry, even if no compilation | |
| 397 // happened. (The method_invocation_event call does this also.) | |
| 398 reset_counter_for_invocation_event(method); | |
| 399 } | |
| 400 // compilation at an invocation overflow no longer goes and retries test for | |
| 401 // compiled method. We always run the loser of the race as interpreted. | |
| 402 // so return NULL | |
| 403 return NULL; | |
| 404 } else { | |
| 405 // counter overflow in a loop => try to do on-stack-replacement | |
| 406 nmethod* osr_nm = method->lookup_osr_nmethod_for(bci, CompLevel_highest_tier, true); | |
| 407 NOT_PRODUCT(trace_osr_request(method, osr_nm, bci)); | |
| 408 // when code cache is full, we should not compile any more... | |
| 409 if (osr_nm == NULL && UseCompiler) { | |
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410 method_back_branch_event(method, bci, thread); |
| 1783 | 411 osr_nm = method->lookup_osr_nmethod_for(bci, CompLevel_highest_tier, true); |
| 412 } | |
| 413 if (osr_nm == NULL) { | |
| 414 reset_counter_for_back_branch_event(method); | |
| 415 return NULL; | |
| 416 } | |
| 417 return osr_nm; | |
| 418 } | |
| 419 return NULL; | |
| 420 } | |
| 421 | |
| 422 #ifndef PRODUCT | |
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423 PRAGMA_FORMAT_NONLITERAL_IGNORED_EXTERNAL |
| 1783 | 424 void NonTieredCompPolicy::trace_frequency_counter_overflow(methodHandle m, int branch_bci, int bci) { |
| 425 if (TraceInvocationCounterOverflow) { | |
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426 MethodCounters* mcs = m->method_counters(); |
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427 assert(mcs != NULL, "MethodCounters cannot be NULL for profiling"); |
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428 InvocationCounter* ic = mcs->invocation_counter(); |
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429 InvocationCounter* bc = mcs->backedge_counter(); |
| 1783 | 430 ResourceMark rm; |
| 431 const char* msg = | |
| 432 bci == InvocationEntryBci | |
| 433 ? "comp-policy cntr ovfl @ %d in entry of " | |
| 434 : "comp-policy cntr ovfl @ %d in loop of "; | |
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435 PRAGMA_DIAG_PUSH |
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436 PRAGMA_FORMAT_NONLITERAL_IGNORED_INTERNAL |
| 1783 | 437 tty->print(msg, bci); |
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438 PRAGMA_DIAG_POP |
| 1783 | 439 m->print_value(); |
| 440 tty->cr(); | |
| 441 ic->print(); | |
| 442 bc->print(); | |
| 443 if (ProfileInterpreter) { | |
| 444 if (bci != InvocationEntryBci) { | |
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445 MethodData* mdo = m->method_data(); |
| 1783 | 446 if (mdo != NULL) { |
| 447 int count = mdo->bci_to_data(branch_bci)->as_JumpData()->taken(); | |
| 448 tty->print_cr("back branch count = %d", count); | |
| 449 } | |
| 450 } | |
| 451 } | |
| 452 } | |
| 453 } | |
| 454 | |
| 455 void NonTieredCompPolicy::trace_osr_request(methodHandle method, nmethod* osr, int bci) { | |
| 456 if (TraceOnStackReplacement) { | |
| 457 ResourceMark rm; | |
| 458 tty->print(osr != NULL ? "Reused OSR entry for " : "Requesting OSR entry for "); | |
| 459 method->print_short_name(tty); | |
| 460 tty->print_cr(" at bci %d", bci); | |
| 461 } | |
| 462 } | |
| 463 #endif // !PRODUCT | |
| 464 | |
| 0 | 465 // SimpleCompPolicy - compile current method |
| 466 | |
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467 void SimpleCompPolicy::method_invocation_event(methodHandle m, JavaThread* thread) { |
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468 const int comp_level = CompLevel_highest_tier; |
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469 const int hot_count = m->invocation_count(); |
| 0 | 470 reset_counter_for_invocation_event(m); |
| 471 const char* comment = "count"; | |
| 472 | |
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473 if (is_compilation_enabled() && can_be_compiled(m, comp_level)) { |
| 0 | 474 nmethod* nm = m->code(); |
| 475 if (nm == NULL ) { | |
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476 CompileBroker::compile_method(m, InvocationEntryBci, comp_level, m, hot_count, comment, thread); |
| 0 | 477 } |
| 478 } | |
| 479 } | |
| 480 | |
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481 void SimpleCompPolicy::method_back_branch_event(methodHandle m, int bci, JavaThread* thread) { |
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482 const int comp_level = CompLevel_highest_tier; |
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483 const int hot_count = m->backedge_count(); |
| 0 | 484 const char* comment = "backedge_count"; |
| 485 | |
| 12073 | 486 if (is_compilation_enabled() && can_be_osr_compiled(m, comp_level)) { |
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487 CompileBroker::compile_method(m, bci, comp_level, m, hot_count, comment, thread); |
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488 NOT_PRODUCT(trace_osr_completion(m->lookup_osr_nmethod_for(bci, comp_level, true));) |
| 0 | 489 } |
| 490 } | |
| 491 // StackWalkCompPolicy - walk up stack to find a suitable method to compile | |
| 492 | |
| 493 #ifdef COMPILER2 | |
| 494 const char* StackWalkCompPolicy::_msg = NULL; | |
| 495 | |
| 496 | |
| 497 // Consider m for compilation | |
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498 void StackWalkCompPolicy::method_invocation_event(methodHandle m, JavaThread* thread) { |
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499 const int comp_level = CompLevel_highest_tier; |
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500 const int hot_count = m->invocation_count(); |
| 0 | 501 reset_counter_for_invocation_event(m); |
| 502 const char* comment = "count"; | |
| 503 | |
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504 if (is_compilation_enabled() && m->code() == NULL && can_be_compiled(m, comp_level)) { |
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505 ResourceMark rm(thread); |
| 0 | 506 frame fr = thread->last_frame(); |
| 507 assert(fr.is_interpreted_frame(), "must be interpreted"); | |
| 508 assert(fr.interpreter_frame_method() == m(), "bad method"); | |
| 509 | |
| 510 if (TraceCompilationPolicy) { | |
| 511 tty->print("method invocation trigger: "); | |
| 512 m->print_short_name(tty); | |
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513 tty->print(" ( interpreted " INTPTR_FORMAT ", size=%d ) ", p2i((address)m()), m->code_size()); |
| 0 | 514 } |
| 515 RegisterMap reg_map(thread, false); | |
| 516 javaVFrame* triggerVF = thread->last_java_vframe(®_map); | |
| 517 // triggerVF is the frame that triggered its counter | |
| 518 RFrame* first = new InterpretedRFrame(triggerVF->fr(), thread, m); | |
| 519 | |
| 520 if (first->top_method()->code() != NULL) { | |
| 521 // called obsolete method/nmethod -- no need to recompile | |
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522 if (TraceCompilationPolicy) tty->print_cr(" --> " INTPTR_FORMAT, p2i(first->top_method()->code())); |
| 0 | 523 } else { |
| 524 if (TimeCompilationPolicy) accumulated_time()->start(); | |
| 525 GrowableArray<RFrame*>* stack = new GrowableArray<RFrame*>(50); | |
| 526 stack->push(first); | |
| 527 RFrame* top = findTopInlinableFrame(stack); | |
| 528 if (TimeCompilationPolicy) accumulated_time()->stop(); | |
| 529 assert(top != NULL, "findTopInlinableFrame returned null"); | |
| 530 if (TraceCompilationPolicy) top->print(); | |
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531 CompileBroker::compile_method(top->top_method(), InvocationEntryBci, comp_level, |
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532 m, hot_count, comment, thread); |
| 0 | 533 } |
| 534 } | |
| 535 } | |
| 536 | |
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537 void StackWalkCompPolicy::method_back_branch_event(methodHandle m, int bci, JavaThread* thread) { |
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538 const int comp_level = CompLevel_highest_tier; |
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539 const int hot_count = m->backedge_count(); |
| 0 | 540 const char* comment = "backedge_count"; |
| 541 | |
| 12073 | 542 if (is_compilation_enabled() && can_be_osr_compiled(m, comp_level)) { |
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543 CompileBroker::compile_method(m, bci, comp_level, m, hot_count, comment, thread); |
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544 NOT_PRODUCT(trace_osr_completion(m->lookup_osr_nmethod_for(bci, comp_level, true));) |
| 0 | 545 } |
| 546 } | |
| 547 | |
| 548 RFrame* StackWalkCompPolicy::findTopInlinableFrame(GrowableArray<RFrame*>* stack) { | |
| 549 // go up the stack until finding a frame that (probably) won't be inlined | |
| 550 // into its caller | |
| 551 RFrame* current = stack->at(0); // current choice for stopping | |
| 552 assert( current && !current->is_compiled(), "" ); | |
| 553 const char* msg = NULL; | |
| 554 | |
| 555 while (1) { | |
| 556 | |
| 557 // before going up the stack further, check if doing so would get us into | |
| 558 // compiled code | |
| 559 RFrame* next = senderOf(current, stack); | |
| 560 if( !next ) // No next frame up the stack? | |
| 561 break; // Then compile with current frame | |
| 562 | |
| 563 methodHandle m = current->top_method(); | |
| 564 methodHandle next_m = next->top_method(); | |
| 565 | |
| 566 if (TraceCompilationPolicy && Verbose) { | |
| 567 tty->print("[caller: "); | |
| 568 next_m->print_short_name(tty); | |
| 569 tty->print("] "); | |
| 570 } | |
| 571 | |
| 572 if( !Inline ) { // Inlining turned off | |
| 573 msg = "Inlining turned off"; | |
| 574 break; | |
| 575 } | |
| 576 if (next_m->is_not_compilable()) { // Did fail to compile this before/ | |
| 577 msg = "caller not compilable"; | |
| 578 break; | |
| 579 } | |
| 580 if (next->num() > MaxRecompilationSearchLength) { | |
| 581 // don't go up too high when searching for recompilees | |
| 582 msg = "don't go up any further: > MaxRecompilationSearchLength"; | |
| 583 break; | |
| 584 } | |
| 585 if (next->distance() > MaxInterpretedSearchLength) { | |
| 586 // don't go up too high when searching for recompilees | |
| 587 msg = "don't go up any further: next > MaxInterpretedSearchLength"; | |
| 588 break; | |
| 589 } | |
| 590 // Compiled frame above already decided not to inline; | |
| 591 // do not recompile him. | |
| 592 if (next->is_compiled()) { | |
| 593 msg = "not going up into optimized code"; | |
| 594 break; | |
| 595 } | |
| 596 | |
| 597 // Interpreted frame above us was already compiled. Do not force | |
| 598 // a recompile, although if the frame above us runs long enough an | |
| 599 // OSR might still happen. | |
| 600 if( current->is_interpreted() && next_m->has_compiled_code() ) { | |
| 601 msg = "not going up -- already compiled caller"; | |
| 602 break; | |
| 603 } | |
| 604 | |
| 605 // Compute how frequent this call site is. We have current method 'm'. | |
| 606 // We know next method 'next_m' is interpreted. Find the call site and | |
| 607 // check the various invocation counts. | |
| 608 int invcnt = 0; // Caller counts | |
| 609 if (ProfileInterpreter) { | |
| 610 invcnt = next_m->interpreter_invocation_count(); | |
| 611 } | |
| 612 int cnt = 0; // Call site counts | |
| 613 if (ProfileInterpreter && next_m->method_data() != NULL) { | |
| 614 ResourceMark rm; | |
| 615 int bci = next->top_vframe()->bci(); | |
| 616 ProfileData* data = next_m->method_data()->bci_to_data(bci); | |
| 617 if (data != NULL && data->is_CounterData()) | |
| 618 cnt = data->as_CounterData()->count(); | |
| 619 } | |
| 620 | |
| 621 // Caller counts / call-site counts; i.e. is this call site | |
| 622 // a hot call site for method next_m? | |
| 623 int freq = (invcnt) ? cnt/invcnt : cnt; | |
| 624 | |
| 625 // Check size and frequency limits | |
| 626 if ((msg = shouldInline(m, freq, cnt)) != NULL) { | |
| 627 break; | |
| 628 } | |
| 629 // Check inlining negative tests | |
| 630 if ((msg = shouldNotInline(m)) != NULL) { | |
| 631 break; | |
| 632 } | |
| 633 | |
| 634 | |
| 635 // If the caller method is too big or something then we do not want to | |
| 636 // compile it just to inline a method | |
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637 if (!can_be_compiled(next_m, CompLevel_any)) { |
| 0 | 638 msg = "caller cannot be compiled"; |
| 639 break; | |
| 640 } | |
| 641 | |
| 642 if( next_m->name() == vmSymbols::class_initializer_name() ) { | |
| 643 msg = "do not compile class initializer (OSR ok)"; | |
| 644 break; | |
| 645 } | |
| 646 | |
| 647 if (TraceCompilationPolicy && Verbose) { | |
| 648 tty->print("\n\t check caller: "); | |
| 649 next_m->print_short_name(tty); | |
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650 tty->print(" ( interpreted " INTPTR_FORMAT ", size=%d ) ", p2i((address)next_m()), next_m->code_size()); |
| 0 | 651 } |
| 652 | |
| 653 current = next; | |
| 654 } | |
| 655 | |
| 656 assert( !current || !current->is_compiled(), "" ); | |
| 657 | |
| 658 if (TraceCompilationPolicy && msg) tty->print("(%s)\n", msg); | |
| 659 | |
| 660 return current; | |
| 661 } | |
| 662 | |
| 663 RFrame* StackWalkCompPolicy::senderOf(RFrame* rf, GrowableArray<RFrame*>* stack) { | |
| 664 RFrame* sender = rf->caller(); | |
| 665 if (sender && sender->num() == stack->length()) stack->push(sender); | |
| 666 return sender; | |
| 667 } | |
| 668 | |
| 669 | |
| 670 const char* StackWalkCompPolicy::shouldInline(methodHandle m, float freq, int cnt) { | |
| 671 // Allows targeted inlining | |
| 672 // positive filter: should send be inlined? returns NULL (--> yes) | |
| 673 // or rejection msg | |
| 674 int max_size = MaxInlineSize; | |
| 675 int cost = m->code_size(); | |
| 676 | |
| 677 // Check for too many throws (and not too huge) | |
| 678 if (m->interpreter_throwout_count() > InlineThrowCount && cost < InlineThrowMaxSize ) { | |
| 679 return NULL; | |
| 680 } | |
| 681 | |
| 682 // bump the max size if the call is frequent | |
| 683 if ((freq >= InlineFrequencyRatio) || (cnt >= InlineFrequencyCount)) { | |
| 684 if (TraceFrequencyInlining) { | |
| 685 tty->print("(Inlined frequent method)\n"); | |
| 686 m->print(); | |
| 687 } | |
| 688 max_size = FreqInlineSize; | |
| 689 } | |
| 690 if (cost > max_size) { | |
| 691 return (_msg = "too big"); | |
| 692 } | |
| 693 return NULL; | |
| 694 } | |
| 695 | |
| 696 | |
| 697 const char* StackWalkCompPolicy::shouldNotInline(methodHandle m) { | |
| 698 // negative filter: should send NOT be inlined? returns NULL (--> inline) or rejection msg | |
| 699 if (m->is_abstract()) return (_msg = "abstract method"); | |
| 700 // note: we allow ik->is_abstract() | |
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701 if (!m->method_holder()->is_initialized()) return (_msg = "method holder not initialized"); |
| 0 | 702 if (m->is_native()) return (_msg = "native method"); |
| 703 nmethod* m_code = m->code(); | |
| 1748 | 704 if (m_code != NULL && m_code->code_size() > InlineSmallCode) |
| 0 | 705 return (_msg = "already compiled into a big method"); |
| 706 | |
| 707 // use frequency-based objections only for non-trivial methods | |
| 708 if (m->code_size() <= MaxTrivialSize) return NULL; | |
| 709 if (UseInterpreter) { // don't use counts with -Xcomp | |
| 710 if ((m->code() == NULL) && m->was_never_executed()) return (_msg = "never executed"); | |
| 711 if (!m->was_executed_more_than(MIN2(MinInliningThreshold, CompileThreshold >> 1))) return (_msg = "executed < MinInliningThreshold times"); | |
| 712 } | |
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713 if (Method::has_unloaded_classes_in_signature(m, JavaThread::current())) return (_msg = "unloaded signature classes"); |
| 0 | 714 |
| 715 return NULL; | |
| 716 } | |
| 717 | |
| 718 | |
| 719 | |
| 720 #endif // COMPILER2 |