Mercurial > hg > truffle
annotate src/share/vm/runtime/compilationPolicy.cpp @ 21445:567fd5394b80
NodeLIRBuilder#getExactPhiKind: handle non-java constants.
author | Josef Eisl <josef.eisl@jku.at> |
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date | Thu, 21 May 2015 11:51:32 +0200 |
parents | 8f2fb6bec986 |
children | be896a1983c0 |
rev | line source |
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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" | |
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"); | |
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173 else tty->print_cr("nmethod " INTPTR_FORMAT, p2i(osr_nm)); |
0 | 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); | |
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185 FLAG_SET_ERGO(intx, CICompilerCount, _compiler_count); |
1783 | 186 } else { |
187 _compiler_count = CICompilerCount; | |
188 } | |
189 } | |
190 | |
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191 // Note: this policy is used ONLY if TieredCompilation is off. |
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192 // compiler_count() behaves the following way: |
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193 // - with TIERED build (with both COMPILER1 and COMPILER2 defined) it should return |
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194 // zero for the c1 compilation levels, hence the particular ordering of the |
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195 // statements. |
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196 // - the same should happen when COMPILER2 is defined and COMPILER1 is not |
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197 // (server build without TIERED defined). |
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198 // - if only COMPILER1 is defined (client build), zero should be returned for |
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199 // the c2 level. |
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200 // - if neither is defined - always return zero. |
1783 | 201 int NonTieredCompPolicy::compiler_count(CompLevel comp_level) { |
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202 assert(!TieredCompilation, "This policy should not be used with TieredCompilation"); |
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203 #if defined(COMPILER2) || defined(COMPILERGRAAL) |
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204 if (is_c2_compile(comp_level)) { |
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205 return _compiler_count; |
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206 } else { |
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207 return 0; |
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208 } |
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209 #endif |
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210 |
1783 | 211 #ifdef COMPILER1 |
212 if (is_c1_compile(comp_level)) { | |
213 return _compiler_count; | |
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214 } else { |
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215 return 0; |
1783 | 216 } |
217 #endif | |
218 | |
219 return 0; | |
220 } | |
221 | |
222 void NonTieredCompPolicy::reset_counter_for_invocation_event(methodHandle m) { | |
0 | 223 // Make sure invocation and backedge counter doesn't overflow again right away |
224 // as would be the case for native methods. | |
225 | |
226 // BUT also make sure the method doesn't look like it was never executed. | |
227 // Set carry bit and reduce counter's value to min(count, CompileThreshold/2). | |
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228 MethodCounters* mcs = m->method_counters(); |
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229 assert(mcs != NULL, "MethodCounters cannot be NULL for profiling"); |
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230 mcs->invocation_counter()->set_carry(); |
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231 mcs->backedge_counter()->set_carry(); |
0 | 232 |
233 assert(!m->was_never_executed(), "don't reset to 0 -- could be mistaken for never-executed"); | |
234 } | |
235 | |
1783 | 236 void NonTieredCompPolicy::reset_counter_for_back_branch_event(methodHandle m) { |
0 | 237 // Delay next back-branch event but pump up invocation counter to triger |
238 // whole method compilation. | |
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239 MethodCounters* mcs = m->method_counters(); |
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240 assert(mcs != NULL, "MethodCounters cannot be NULL for profiling"); |
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241 InvocationCounter* i = mcs->invocation_counter(); |
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242 InvocationCounter* b = mcs->backedge_counter(); |
0 | 243 |
244 // Don't set invocation_counter's value too low otherwise the method will | |
245 // look like immature (ic < ~5300) which prevents the inlining based on | |
246 // the type profiling. | |
247 i->set(i->state(), CompileThreshold); | |
248 // Don't reset counter too low - it is used to check if OSR method is ready. | |
249 b->set(b->state(), CompileThreshold / 2); | |
250 } | |
251 | |
1783 | 252 // |
253 // CounterDecay | |
254 // | |
255 // Interates through invocation counters and decrements them. This | |
256 // is done at each safepoint. | |
257 // | |
258 class CounterDecay : public AllStatic { | |
259 static jlong _last_timestamp; | |
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260 static void do_method(Method* m) { |
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261 MethodCounters* mcs = m->method_counters(); |
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262 if (mcs != NULL) { |
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263 mcs->invocation_counter()->decay(); |
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264 } |
1783 | 265 } |
266 public: | |
267 static void decay(); | |
268 static bool is_decay_needed() { | |
269 return (os::javaTimeMillis() - _last_timestamp) > CounterDecayMinIntervalLength; | |
270 } | |
271 }; | |
272 | |
273 jlong CounterDecay::_last_timestamp = 0; | |
274 | |
275 void CounterDecay::decay() { | |
276 _last_timestamp = os::javaTimeMillis(); | |
277 | |
278 // This operation is going to be performed only at the end of a safepoint | |
279 // and hence GC's will not be going on, all Java mutators are suspended | |
280 // at this point and hence SystemDictionary_lock is also not needed. | |
281 assert(SafepointSynchronize::is_at_safepoint(), "can only be executed at a safepoint"); | |
282 int nclasses = SystemDictionary::number_of_classes(); | |
283 double classes_per_tick = nclasses * (CounterDecayMinIntervalLength * 1e-3 / | |
284 CounterHalfLifeTime); | |
285 for (int i = 0; i < classes_per_tick; i++) { | |
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286 Klass* k = SystemDictionary::try_get_next_class(); |
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287 if (k != NULL && k->oop_is_instance()) { |
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288 InstanceKlass::cast(k)->methods_do(do_method); |
1783 | 289 } |
290 } | |
291 } | |
292 | |
293 // Called at the end of the safepoint | |
294 void NonTieredCompPolicy::do_safepoint_work() { | |
295 if(UseCounterDecay && CounterDecay::is_decay_needed()) { | |
296 CounterDecay::decay(); | |
297 } | |
298 } | |
299 | |
300 void NonTieredCompPolicy::reprofile(ScopeDesc* trap_scope, bool is_osr) { | |
301 ScopeDesc* sd = trap_scope; | |
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302 MethodCounters* mcs; |
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303 InvocationCounter* c; |
1783 | 304 for (; !sd->is_top(); sd = sd->sender()) { |
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305 mcs = sd->method()->method_counters(); |
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306 if (mcs != NULL) { |
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307 // Reset ICs of inlined methods, since they can trigger compilations also. |
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308 mcs->invocation_counter()->reset(); |
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309 } |
1783 | 310 } |
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311 mcs = sd->method()->method_counters(); |
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312 if (mcs != NULL) { |
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313 c = mcs->invocation_counter(); |
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314 if (is_osr) { |
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315 // It was an OSR method, so bump the count higher. |
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316 c->set(c->state(), CompileThreshold); |
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317 } else { |
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318 c->reset(); |
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319 } |
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320 mcs->backedge_counter()->reset(); |
1783 | 321 } |
322 } | |
323 | |
324 // This method can be called by any component of the runtime to notify the policy | |
325 // that it's recommended to delay the complation of this method. | |
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326 void NonTieredCompPolicy::delay_compilation(Method* method) { |
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327 MethodCounters* mcs = method->method_counters(); |
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328 if (mcs != NULL) { |
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329 mcs->invocation_counter()->decay(); |
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330 mcs->backedge_counter()->decay(); |
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331 } |
1783 | 332 } |
333 | |
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334 void NonTieredCompPolicy::disable_compilation(Method* method) { |
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335 MethodCounters* mcs = method->method_counters(); |
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336 if (mcs != NULL) { |
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337 mcs->invocation_counter()->set_state(InvocationCounter::wait_for_nothing); |
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338 mcs->backedge_counter()->set_state(InvocationCounter::wait_for_nothing); |
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339 } |
1783 | 340 } |
341 | |
342 CompileTask* NonTieredCompPolicy::select_task(CompileQueue* compile_queue) { | |
343 return compile_queue->first(); | |
344 } | |
345 | |
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346 bool NonTieredCompPolicy::is_mature(Method* method) { |
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347 MethodData* mdo = method->method_data(); |
1783 | 348 assert(mdo != NULL, "Should be"); |
349 uint current = mdo->mileage_of(method); | |
350 uint initial = mdo->creation_mileage(); | |
351 if (current < initial) | |
352 return true; // some sort of overflow | |
353 uint target; | |
354 if (ProfileMaturityPercentage <= 0) | |
355 target = (uint) -ProfileMaturityPercentage; // absolute value | |
356 else | |
357 target = (uint)( (ProfileMaturityPercentage * CompileThreshold) / 100 ); | |
358 return (current >= initial + target); | |
359 } | |
360 | |
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361 nmethod* NonTieredCompPolicy::event(methodHandle method, methodHandle inlinee, int branch_bci, |
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362 int bci, CompLevel comp_level, nmethod* nm, JavaThread* thread) { |
1783 | 363 assert(comp_level == CompLevel_none, "This should be only called from the interpreter"); |
364 NOT_PRODUCT(trace_frequency_counter_overflow(method, branch_bci, bci)); | |
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365 if (JvmtiExport::can_post_interpreter_events() && thread->is_interp_only_mode()) { |
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366 // If certain JVMTI events (e.g. frame pop event) are requested then the |
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367 // thread is forced to remain in interpreted code. This is |
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368 // implemented partly by a check in the run_compiled_code |
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369 // section of the interpreter whether we should skip running |
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370 // compiled code, and partly by skipping OSR compiles for |
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371 // interpreted-only threads. |
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372 if (bci != InvocationEntryBci) { |
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373 reset_counter_for_back_branch_event(method); |
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374 return NULL; |
1783 | 375 } |
376 } | |
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377 if (CompileTheWorld || ReplayCompiles) { |
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378 // Don't trigger other compiles in testing mode |
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379 if (bci == InvocationEntryBci) { |
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380 reset_counter_for_invocation_event(method); |
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381 } else { |
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382 reset_counter_for_back_branch_event(method); |
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383 } |
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384 return NULL; |
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385 } |
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386 |
1783 | 387 if (bci == InvocationEntryBci) { |
388 // when code cache is full, compilation gets switched off, UseCompiler | |
389 // is set to false | |
390 if (!method->has_compiled_code() && UseCompiler) { | |
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391 method_invocation_event(method, thread); |
1783 | 392 } else { |
393 // Force counter overflow on method entry, even if no compilation | |
394 // happened. (The method_invocation_event call does this also.) | |
395 reset_counter_for_invocation_event(method); | |
396 } | |
397 // compilation at an invocation overflow no longer goes and retries test for | |
398 // compiled method. We always run the loser of the race as interpreted. | |
399 // so return NULL | |
400 return NULL; | |
401 } else { | |
402 // counter overflow in a loop => try to do on-stack-replacement | |
403 nmethod* osr_nm = method->lookup_osr_nmethod_for(bci, CompLevel_highest_tier, true); | |
404 NOT_PRODUCT(trace_osr_request(method, osr_nm, bci)); | |
405 // when code cache is full, we should not compile any more... | |
406 if (osr_nm == NULL && UseCompiler) { | |
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407 method_back_branch_event(method, bci, thread); |
1783 | 408 osr_nm = method->lookup_osr_nmethod_for(bci, CompLevel_highest_tier, true); |
409 } | |
410 if (osr_nm == NULL) { | |
411 reset_counter_for_back_branch_event(method); | |
412 return NULL; | |
413 } | |
414 return osr_nm; | |
415 } | |
416 return NULL; | |
417 } | |
418 | |
419 #ifndef PRODUCT | |
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420 PRAGMA_FORMAT_NONLITERAL_IGNORED_EXTERNAL |
1783 | 421 void NonTieredCompPolicy::trace_frequency_counter_overflow(methodHandle m, int branch_bci, int bci) { |
422 if (TraceInvocationCounterOverflow) { | |
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423 MethodCounters* mcs = m->method_counters(); |
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424 assert(mcs != NULL, "MethodCounters cannot be NULL for profiling"); |
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425 InvocationCounter* ic = mcs->invocation_counter(); |
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426 InvocationCounter* bc = mcs->backedge_counter(); |
1783 | 427 ResourceMark rm; |
428 const char* msg = | |
429 bci == InvocationEntryBci | |
430 ? "comp-policy cntr ovfl @ %d in entry of " | |
431 : "comp-policy cntr ovfl @ %d in loop of "; | |
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432 PRAGMA_DIAG_PUSH |
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433 PRAGMA_FORMAT_NONLITERAL_IGNORED_INTERNAL |
1783 | 434 tty->print(msg, bci); |
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435 PRAGMA_DIAG_POP |
1783 | 436 m->print_value(); |
437 tty->cr(); | |
438 ic->print(); | |
439 bc->print(); | |
440 if (ProfileInterpreter) { | |
441 if (bci != InvocationEntryBci) { | |
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442 MethodData* mdo = m->method_data(); |
1783 | 443 if (mdo != NULL) { |
444 int count = mdo->bci_to_data(branch_bci)->as_JumpData()->taken(); | |
445 tty->print_cr("back branch count = %d", count); | |
446 } | |
447 } | |
448 } | |
449 } | |
450 } | |
451 | |
452 void NonTieredCompPolicy::trace_osr_request(methodHandle method, nmethod* osr, int bci) { | |
453 if (TraceOnStackReplacement) { | |
454 ResourceMark rm; | |
455 tty->print(osr != NULL ? "Reused OSR entry for " : "Requesting OSR entry for "); | |
456 method->print_short_name(tty); | |
457 tty->print_cr(" at bci %d", bci); | |
458 } | |
459 } | |
460 #endif // !PRODUCT | |
461 | |
0 | 462 // SimpleCompPolicy - compile current method |
463 | |
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464 void SimpleCompPolicy::method_invocation_event(methodHandle m, JavaThread* thread) { |
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465 const int comp_level = CompLevel_highest_tier; |
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466 const int hot_count = m->invocation_count(); |
0 | 467 reset_counter_for_invocation_event(m); |
468 const char* comment = "count"; | |
469 | |
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470 if (is_compilation_enabled() && can_be_compiled(m, comp_level)) { |
0 | 471 nmethod* nm = m->code(); |
472 if (nm == NULL ) { | |
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473 CompileBroker::compile_method(m, InvocationEntryBci, comp_level, m, hot_count, comment, thread); |
0 | 474 } |
475 } | |
476 } | |
477 | |
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478 void SimpleCompPolicy::method_back_branch_event(methodHandle m, int bci, JavaThread* thread) { |
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479 const int comp_level = CompLevel_highest_tier; |
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480 const int hot_count = m->backedge_count(); |
0 | 481 const char* comment = "backedge_count"; |
482 | |
12073 | 483 if (is_compilation_enabled() && can_be_osr_compiled(m, comp_level)) { |
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484 CompileBroker::compile_method(m, bci, comp_level, m, hot_count, comment, thread); |
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485 NOT_PRODUCT(trace_osr_completion(m->lookup_osr_nmethod_for(bci, comp_level, true));) |
0 | 486 } |
487 } | |
488 // StackWalkCompPolicy - walk up stack to find a suitable method to compile | |
489 | |
490 #ifdef COMPILER2 | |
491 const char* StackWalkCompPolicy::_msg = NULL; | |
492 | |
493 | |
494 // Consider m for compilation | |
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495 void StackWalkCompPolicy::method_invocation_event(methodHandle m, JavaThread* thread) { |
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496 const int comp_level = CompLevel_highest_tier; |
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497 const int hot_count = m->invocation_count(); |
0 | 498 reset_counter_for_invocation_event(m); |
499 const char* comment = "count"; | |
500 | |
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501 if (is_compilation_enabled() && m->code() == NULL && can_be_compiled(m, comp_level)) { |
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502 ResourceMark rm(thread); |
0 | 503 frame fr = thread->last_frame(); |
504 assert(fr.is_interpreted_frame(), "must be interpreted"); | |
505 assert(fr.interpreter_frame_method() == m(), "bad method"); | |
506 | |
507 if (TraceCompilationPolicy) { | |
508 tty->print("method invocation trigger: "); | |
509 m->print_short_name(tty); | |
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510 tty->print(" ( interpreted " INTPTR_FORMAT ", size=%d ) ", p2i((address)m()), m->code_size()); |
0 | 511 } |
512 RegisterMap reg_map(thread, false); | |
513 javaVFrame* triggerVF = thread->last_java_vframe(®_map); | |
514 // triggerVF is the frame that triggered its counter | |
515 RFrame* first = new InterpretedRFrame(triggerVF->fr(), thread, m); | |
516 | |
517 if (first->top_method()->code() != NULL) { | |
518 // called obsolete method/nmethod -- no need to recompile | |
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519 if (TraceCompilationPolicy) tty->print_cr(" --> " INTPTR_FORMAT, p2i(first->top_method()->code())); |
0 | 520 } else { |
521 if (TimeCompilationPolicy) accumulated_time()->start(); | |
522 GrowableArray<RFrame*>* stack = new GrowableArray<RFrame*>(50); | |
523 stack->push(first); | |
524 RFrame* top = findTopInlinableFrame(stack); | |
525 if (TimeCompilationPolicy) accumulated_time()->stop(); | |
526 assert(top != NULL, "findTopInlinableFrame returned null"); | |
527 if (TraceCompilationPolicy) top->print(); | |
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528 CompileBroker::compile_method(top->top_method(), InvocationEntryBci, comp_level, |
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529 m, hot_count, comment, thread); |
0 | 530 } |
531 } | |
532 } | |
533 | |
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534 void StackWalkCompPolicy::method_back_branch_event(methodHandle m, int bci, JavaThread* thread) { |
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535 const int comp_level = CompLevel_highest_tier; |
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536 const int hot_count = m->backedge_count(); |
0 | 537 const char* comment = "backedge_count"; |
538 | |
12073 | 539 if (is_compilation_enabled() && can_be_osr_compiled(m, comp_level)) { |
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540 CompileBroker::compile_method(m, bci, comp_level, m, hot_count, comment, thread); |
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541 NOT_PRODUCT(trace_osr_completion(m->lookup_osr_nmethod_for(bci, comp_level, true));) |
0 | 542 } |
543 } | |
544 | |
545 RFrame* StackWalkCompPolicy::findTopInlinableFrame(GrowableArray<RFrame*>* stack) { | |
546 // go up the stack until finding a frame that (probably) won't be inlined | |
547 // into its caller | |
548 RFrame* current = stack->at(0); // current choice for stopping | |
549 assert( current && !current->is_compiled(), "" ); | |
550 const char* msg = NULL; | |
551 | |
552 while (1) { | |
553 | |
554 // before going up the stack further, check if doing so would get us into | |
555 // compiled code | |
556 RFrame* next = senderOf(current, stack); | |
557 if( !next ) // No next frame up the stack? | |
558 break; // Then compile with current frame | |
559 | |
560 methodHandle m = current->top_method(); | |
561 methodHandle next_m = next->top_method(); | |
562 | |
563 if (TraceCompilationPolicy && Verbose) { | |
564 tty->print("[caller: "); | |
565 next_m->print_short_name(tty); | |
566 tty->print("] "); | |
567 } | |
568 | |
569 if( !Inline ) { // Inlining turned off | |
570 msg = "Inlining turned off"; | |
571 break; | |
572 } | |
573 if (next_m->is_not_compilable()) { // Did fail to compile this before/ | |
574 msg = "caller not compilable"; | |
575 break; | |
576 } | |
577 if (next->num() > MaxRecompilationSearchLength) { | |
578 // don't go up too high when searching for recompilees | |
579 msg = "don't go up any further: > MaxRecompilationSearchLength"; | |
580 break; | |
581 } | |
582 if (next->distance() > MaxInterpretedSearchLength) { | |
583 // don't go up too high when searching for recompilees | |
584 msg = "don't go up any further: next > MaxInterpretedSearchLength"; | |
585 break; | |
586 } | |
587 // Compiled frame above already decided not to inline; | |
588 // do not recompile him. | |
589 if (next->is_compiled()) { | |
590 msg = "not going up into optimized code"; | |
591 break; | |
592 } | |
593 | |
594 // Interpreted frame above us was already compiled. Do not force | |
595 // a recompile, although if the frame above us runs long enough an | |
596 // OSR might still happen. | |
597 if( current->is_interpreted() && next_m->has_compiled_code() ) { | |
598 msg = "not going up -- already compiled caller"; | |
599 break; | |
600 } | |
601 | |
602 // Compute how frequent this call site is. We have current method 'm'. | |
603 // We know next method 'next_m' is interpreted. Find the call site and | |
604 // check the various invocation counts. | |
605 int invcnt = 0; // Caller counts | |
606 if (ProfileInterpreter) { | |
607 invcnt = next_m->interpreter_invocation_count(); | |
608 } | |
609 int cnt = 0; // Call site counts | |
610 if (ProfileInterpreter && next_m->method_data() != NULL) { | |
611 ResourceMark rm; | |
612 int bci = next->top_vframe()->bci(); | |
613 ProfileData* data = next_m->method_data()->bci_to_data(bci); | |
614 if (data != NULL && data->is_CounterData()) | |
615 cnt = data->as_CounterData()->count(); | |
616 } | |
617 | |
618 // Caller counts / call-site counts; i.e. is this call site | |
619 // a hot call site for method next_m? | |
620 int freq = (invcnt) ? cnt/invcnt : cnt; | |
621 | |
622 // Check size and frequency limits | |
623 if ((msg = shouldInline(m, freq, cnt)) != NULL) { | |
624 break; | |
625 } | |
626 // Check inlining negative tests | |
627 if ((msg = shouldNotInline(m)) != NULL) { | |
628 break; | |
629 } | |
630 | |
631 | |
632 // If the caller method is too big or something then we do not want to | |
633 // compile it just to inline a method | |
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634 if (!can_be_compiled(next_m, CompLevel_any)) { |
0 | 635 msg = "caller cannot be compiled"; |
636 break; | |
637 } | |
638 | |
639 if( next_m->name() == vmSymbols::class_initializer_name() ) { | |
640 msg = "do not compile class initializer (OSR ok)"; | |
641 break; | |
642 } | |
643 | |
644 if (TraceCompilationPolicy && Verbose) { | |
645 tty->print("\n\t check caller: "); | |
646 next_m->print_short_name(tty); | |
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647 tty->print(" ( interpreted " INTPTR_FORMAT ", size=%d ) ", p2i((address)next_m()), next_m->code_size()); |
0 | 648 } |
649 | |
650 current = next; | |
651 } | |
652 | |
653 assert( !current || !current->is_compiled(), "" ); | |
654 | |
655 if (TraceCompilationPolicy && msg) tty->print("(%s)\n", msg); | |
656 | |
657 return current; | |
658 } | |
659 | |
660 RFrame* StackWalkCompPolicy::senderOf(RFrame* rf, GrowableArray<RFrame*>* stack) { | |
661 RFrame* sender = rf->caller(); | |
662 if (sender && sender->num() == stack->length()) stack->push(sender); | |
663 return sender; | |
664 } | |
665 | |
666 | |
667 const char* StackWalkCompPolicy::shouldInline(methodHandle m, float freq, int cnt) { | |
668 // Allows targeted inlining | |
669 // positive filter: should send be inlined? returns NULL (--> yes) | |
670 // or rejection msg | |
671 int max_size = MaxInlineSize; | |
672 int cost = m->code_size(); | |
673 | |
674 // Check for too many throws (and not too huge) | |
675 if (m->interpreter_throwout_count() > InlineThrowCount && cost < InlineThrowMaxSize ) { | |
676 return NULL; | |
677 } | |
678 | |
679 // bump the max size if the call is frequent | |
680 if ((freq >= InlineFrequencyRatio) || (cnt >= InlineFrequencyCount)) { | |
681 if (TraceFrequencyInlining) { | |
682 tty->print("(Inlined frequent method)\n"); | |
683 m->print(); | |
684 } | |
685 max_size = FreqInlineSize; | |
686 } | |
687 if (cost > max_size) { | |
688 return (_msg = "too big"); | |
689 } | |
690 return NULL; | |
691 } | |
692 | |
693 | |
694 const char* StackWalkCompPolicy::shouldNotInline(methodHandle m) { | |
695 // negative filter: should send NOT be inlined? returns NULL (--> inline) or rejection msg | |
696 if (m->is_abstract()) return (_msg = "abstract method"); | |
697 // note: we allow ik->is_abstract() | |
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698 if (!m->method_holder()->is_initialized()) return (_msg = "method holder not initialized"); |
0 | 699 if (m->is_native()) return (_msg = "native method"); |
700 nmethod* m_code = m->code(); | |
1748 | 701 if (m_code != NULL && m_code->code_size() > InlineSmallCode) |
0 | 702 return (_msg = "already compiled into a big method"); |
703 | |
704 // use frequency-based objections only for non-trivial methods | |
705 if (m->code_size() <= MaxTrivialSize) return NULL; | |
706 if (UseInterpreter) { // don't use counts with -Xcomp | |
707 if ((m->code() == NULL) && m->was_never_executed()) return (_msg = "never executed"); | |
708 if (!m->was_executed_more_than(MIN2(MinInliningThreshold, CompileThreshold >> 1))) return (_msg = "executed < MinInliningThreshold times"); | |
709 } | |
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710 if (Method::has_unloaded_classes_in_signature(m, JavaThread::current())) return (_msg = "unloaded signature classes"); |
0 | 711 |
712 return NULL; | |
713 } | |
714 | |
715 | |
716 | |
717 #endif // COMPILER2 |