Mercurial > hg > graal-jvmci-8
annotate src/share/vm/runtime/compilationPolicy.cpp @ 23404:3ef45d0a6d77
Remove jvmci VM configuration, and backport UseJVMCICompiler flag.
author | Roland Schatz <roland.schatz@oracle.com> |
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date | Tue, 24 May 2016 13:51:28 +0200 |
parents | 7ae6a635fad0 |
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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 | |
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110 void CompilationPolicy::compile_if_required(methodHandle selected_method, TRAPS) { |
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111 if (must_be_compiled(selected_method)) { |
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112 // This path is unusual, mostly used by the '-Xcomp' stress test mode. |
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113 |
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114 // Note: with several active threads, the must_be_compiled may be true |
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115 // while can_be_compiled is false; remove assert |
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116 // assert(CompilationPolicy::can_be_compiled(selected_method), "cannot compile"); |
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117 if (!THREAD->can_call_java() || THREAD->is_Compiler_thread()) { |
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118 // don't force compilation, resolve was on behalf of compiler |
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119 return; |
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120 } |
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121 if (selected_method->method_holder()->is_not_initialized()) { |
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122 // 'is_not_initialized' means not only '!is_initialized', but also that |
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123 // initialization has not been started yet ('!being_initialized') |
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124 // Do not force compilation of methods in uninitialized classes. |
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125 // Note that doing this would throw an assert later, |
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126 // in CompileBroker::compile_method. |
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127 // We sometimes use the link resolver to do reflective lookups |
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128 // even before classes are initialized. |
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129 return; |
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130 } |
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131 CompileBroker::compile_method(selected_method, InvocationEntryBci, |
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132 CompilationPolicy::policy()->initial_compile_level(), |
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133 methodHandle(), 0, "must_be_compiled", CHECK); |
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134 } |
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135 } |
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136 |
0 | 137 // Returns true if m is allowed to be compiled |
1783 | 138 bool CompilationPolicy::can_be_compiled(methodHandle m, int comp_level) { |
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139 // allow any levels for WhiteBox |
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140 assert(WhiteBoxAPI || comp_level == CompLevel_all || is_compile(comp_level), "illegal compilation level"); |
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141 |
0 | 142 if (m->is_abstract()) return false; |
143 if (DontCompileHugeMethods && m->code_size() > HugeMethodLimit) return false; | |
144 | |
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145 // Math intrinsics should never be compiled as this can lead to |
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146 // monotonicity problems because the interpreter will prefer the |
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147 // compiled code to the intrinsic version. This can't happen in |
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148 // production because the invocation counter can't be incremented |
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149 // but we shouldn't expose the system to this problem in testing |
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150 // modes. |
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151 if (!AbstractInterpreter::can_be_compiled(m)) { |
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152 return false; |
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153 } |
1783 | 154 if (comp_level == CompLevel_all) { |
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155 if (TieredCompilation) { |
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156 // enough to be compilable at any level for tiered |
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157 return !m->is_not_compilable(CompLevel_simple) || !m->is_not_compilable(CompLevel_full_optimization); |
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158 } else { |
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159 // must be compilable at available level for non-tiered |
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160 return !m->is_not_compilable(CompLevel_highest_tier); |
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161 } |
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162 } else if (is_compile(comp_level)) { |
1783 | 163 return !m->is_not_compilable(comp_level); |
164 } | |
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165 return false; |
1783 | 166 } |
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167 |
12073 | 168 // Returns true if m is allowed to be osr compiled |
169 bool CompilationPolicy::can_be_osr_compiled(methodHandle m, int comp_level) { | |
170 bool result = false; | |
171 if (comp_level == CompLevel_all) { | |
172 if (TieredCompilation) { | |
173 // enough to be osr compilable at any level for tiered | |
174 result = !m->is_not_osr_compilable(CompLevel_simple) || !m->is_not_osr_compilable(CompLevel_full_optimization); | |
175 } else { | |
176 // must be osr compilable at available level for non-tiered | |
177 result = !m->is_not_osr_compilable(CompLevel_highest_tier); | |
178 } | |
179 } else if (is_compile(comp_level)) { | |
180 result = !m->is_not_osr_compilable(comp_level); | |
181 } | |
182 return (result && can_be_compiled(m, comp_level)); | |
183 } | |
184 | |
1783 | 185 bool CompilationPolicy::is_compilation_enabled() { |
186 // NOTE: CompileBroker::should_compile_new_jobs() checks for UseCompiler | |
187 return !delay_compilation_during_startup() && CompileBroker::should_compile_new_jobs(); | |
0 | 188 } |
189 | |
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190 CompileTask* CompilationPolicy::select_task_helper(CompileQueue* compile_queue) { |
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191 #if INCLUDE_JVMCI |
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192 if (UseJVMCICompiler && !BackgroundCompilation) { |
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193 /* |
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194 * In blocking compilation mode, the CompileBroker will make |
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195 * compilations submitted by a JVMCI compiler thread non-blocking. These |
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196 * compilations should be scheduled after all blocking compilations |
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197 * to service non-compiler related compilations sooner and reduce the |
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198 * chance of such compilations timing out. |
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199 */ |
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200 for (CompileTask* task = compile_queue->first(); task != NULL; task = task->next()) { |
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201 if (task->is_blocking()) { |
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202 return task; |
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203 } |
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204 } |
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205 } |
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206 #endif |
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207 return compile_queue->first(); |
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208 } |
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209 |
0 | 210 #ifndef PRODUCT |
211 void CompilationPolicy::print_time() { | |
212 tty->print_cr ("Accumulated compilationPolicy times:"); | |
213 tty->print_cr ("---------------------------"); | |
214 tty->print_cr (" Total: %3.3f sec.", _accumulated_time.seconds()); | |
215 } | |
216 | |
1783 | 217 void NonTieredCompPolicy::trace_osr_completion(nmethod* osr_nm) { |
0 | 218 if (TraceOnStackReplacement) { |
219 if (osr_nm == NULL) tty->print_cr("compilation failed"); | |
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220 else tty->print_cr("nmethod " INTPTR_FORMAT, p2i(osr_nm)); |
0 | 221 } |
222 } | |
223 #endif // !PRODUCT | |
224 | |
1783 | 225 void NonTieredCompPolicy::initialize() { |
226 // Setup the compiler thread numbers | |
227 if (CICompilerCountPerCPU) { | |
228 // Example: if CICompilerCountPerCPU is true, then we get | |
229 // max(log2(8)-1,1) = 2 compiler threads on an 8-way machine. | |
230 // May help big-app startup time. | |
231 _compiler_count = MAX2(log2_intptr(os::active_processor_count())-1,1); | |
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232 FLAG_SET_ERGO(intx, CICompilerCount, _compiler_count); |
1783 | 233 } else { |
234 _compiler_count = CICompilerCount; | |
235 } | |
236 } | |
237 | |
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238 // Note: this policy is used ONLY if TieredCompilation is off. |
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239 // compiler_count() behaves the following way: |
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240 // - with TIERED build (with both COMPILER1 and COMPILER2 defined) it should return |
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241 // zero for the c1 compilation levels, hence the particular ordering of the |
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242 // statements. |
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243 // - the same should happen when COMPILER2 is defined and COMPILER1 is not |
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244 // (server build without TIERED defined). |
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245 // - if only COMPILER1 is defined (client build), zero should be returned for |
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246 // the c2 level. |
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247 // - if neither is defined - always return zero. |
1783 | 248 int NonTieredCompPolicy::compiler_count(CompLevel comp_level) { |
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249 assert(!TieredCompilation, "This policy should not be used with TieredCompilation"); |
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250 #ifdef COMPILER2 |
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251 if (is_c2_compile(comp_level)) { |
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252 return _compiler_count; |
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253 } else { |
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254 return 0; |
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255 } |
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256 #endif |
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257 |
1783 | 258 #ifdef COMPILER1 |
259 if (is_c1_compile(comp_level)) { | |
260 return _compiler_count; | |
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261 } else { |
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262 return 0; |
1783 | 263 } |
264 #endif | |
265 | |
266 return 0; | |
267 } | |
268 | |
269 void NonTieredCompPolicy::reset_counter_for_invocation_event(methodHandle m) { | |
0 | 270 // Make sure invocation and backedge counter doesn't overflow again right away |
271 // as would be the case for native methods. | |
272 | |
273 // BUT also make sure the method doesn't look like it was never executed. | |
274 // Set carry bit and reduce counter's value to min(count, CompileThreshold/2). | |
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275 MethodCounters* mcs = m->method_counters(); |
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276 assert(mcs != NULL, "MethodCounters cannot be NULL for profiling"); |
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277 mcs->invocation_counter()->set_carry(); |
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278 mcs->backedge_counter()->set_carry(); |
0 | 279 |
280 assert(!m->was_never_executed(), "don't reset to 0 -- could be mistaken for never-executed"); | |
281 } | |
282 | |
1783 | 283 void NonTieredCompPolicy::reset_counter_for_back_branch_event(methodHandle m) { |
0 | 284 // Delay next back-branch event but pump up invocation counter to triger |
285 // whole method compilation. | |
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286 MethodCounters* mcs = m->method_counters(); |
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287 assert(mcs != NULL, "MethodCounters cannot be NULL for profiling"); |
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288 InvocationCounter* i = mcs->invocation_counter(); |
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289 InvocationCounter* b = mcs->backedge_counter(); |
0 | 290 |
291 // Don't set invocation_counter's value too low otherwise the method will | |
292 // look like immature (ic < ~5300) which prevents the inlining based on | |
293 // the type profiling. | |
294 i->set(i->state(), CompileThreshold); | |
295 // Don't reset counter too low - it is used to check if OSR method is ready. | |
296 b->set(b->state(), CompileThreshold / 2); | |
297 } | |
298 | |
1783 | 299 // |
300 // CounterDecay | |
301 // | |
302 // Interates through invocation counters and decrements them. This | |
303 // is done at each safepoint. | |
304 // | |
305 class CounterDecay : public AllStatic { | |
306 static jlong _last_timestamp; | |
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307 static void do_method(Method* m) { |
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308 MethodCounters* mcs = m->method_counters(); |
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309 if (mcs != NULL) { |
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310 mcs->invocation_counter()->decay(); |
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311 } |
1783 | 312 } |
313 public: | |
314 static void decay(); | |
315 static bool is_decay_needed() { | |
316 return (os::javaTimeMillis() - _last_timestamp) > CounterDecayMinIntervalLength; | |
317 } | |
318 }; | |
319 | |
320 jlong CounterDecay::_last_timestamp = 0; | |
321 | |
322 void CounterDecay::decay() { | |
323 _last_timestamp = os::javaTimeMillis(); | |
324 | |
325 // This operation is going to be performed only at the end of a safepoint | |
326 // and hence GC's will not be going on, all Java mutators are suspended | |
327 // at this point and hence SystemDictionary_lock is also not needed. | |
328 assert(SafepointSynchronize::is_at_safepoint(), "can only be executed at a safepoint"); | |
329 int nclasses = SystemDictionary::number_of_classes(); | |
330 double classes_per_tick = nclasses * (CounterDecayMinIntervalLength * 1e-3 / | |
331 CounterHalfLifeTime); | |
332 for (int i = 0; i < classes_per_tick; i++) { | |
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333 Klass* k = SystemDictionary::try_get_next_class(); |
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334 if (k != NULL && k->oop_is_instance()) { |
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335 InstanceKlass::cast(k)->methods_do(do_method); |
1783 | 336 } |
337 } | |
338 } | |
339 | |
340 // Called at the end of the safepoint | |
341 void NonTieredCompPolicy::do_safepoint_work() { | |
342 if(UseCounterDecay && CounterDecay::is_decay_needed()) { | |
343 CounterDecay::decay(); | |
344 } | |
345 } | |
346 | |
347 void NonTieredCompPolicy::reprofile(ScopeDesc* trap_scope, bool is_osr) { | |
348 ScopeDesc* sd = trap_scope; | |
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349 MethodCounters* mcs; |
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350 InvocationCounter* c; |
1783 | 351 for (; !sd->is_top(); sd = sd->sender()) { |
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352 mcs = sd->method()->method_counters(); |
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353 if (mcs != NULL) { |
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354 // Reset ICs of inlined methods, since they can trigger compilations also. |
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355 mcs->invocation_counter()->reset(); |
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356 } |
1783 | 357 } |
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358 mcs = sd->method()->method_counters(); |
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359 if (mcs != NULL) { |
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360 c = mcs->invocation_counter(); |
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361 if (is_osr) { |
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362 // It was an OSR method, so bump the count higher. |
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363 c->set(c->state(), CompileThreshold); |
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364 } else { |
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365 c->reset(); |
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366 } |
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367 mcs->backedge_counter()->reset(); |
1783 | 368 } |
369 } | |
370 | |
371 // This method can be called by any component of the runtime to notify the policy | |
372 // that it's recommended to delay the complation of this method. | |
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373 void NonTieredCompPolicy::delay_compilation(Method* method) { |
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374 MethodCounters* mcs = method->method_counters(); |
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375 if (mcs != NULL) { |
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376 mcs->invocation_counter()->decay(); |
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377 mcs->backedge_counter()->decay(); |
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378 } |
1783 | 379 } |
380 | |
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381 void NonTieredCompPolicy::disable_compilation(Method* method) { |
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382 MethodCounters* mcs = method->method_counters(); |
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383 if (mcs != NULL) { |
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384 mcs->invocation_counter()->set_state(InvocationCounter::wait_for_nothing); |
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385 mcs->backedge_counter()->set_state(InvocationCounter::wait_for_nothing); |
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386 } |
1783 | 387 } |
388 | |
389 CompileTask* NonTieredCompPolicy::select_task(CompileQueue* compile_queue) { | |
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390 return select_task_helper(compile_queue); |
1783 | 391 } |
392 | |
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393 bool NonTieredCompPolicy::is_mature(Method* method) { |
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394 MethodData* mdo = method->method_data(); |
1783 | 395 assert(mdo != NULL, "Should be"); |
396 uint current = mdo->mileage_of(method); | |
397 uint initial = mdo->creation_mileage(); | |
398 if (current < initial) | |
399 return true; // some sort of overflow | |
400 uint target; | |
401 if (ProfileMaturityPercentage <= 0) | |
402 target = (uint) -ProfileMaturityPercentage; // absolute value | |
403 else | |
404 target = (uint)( (ProfileMaturityPercentage * CompileThreshold) / 100 ); | |
405 return (current >= initial + target); | |
406 } | |
407 | |
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408 nmethod* NonTieredCompPolicy::event(methodHandle method, methodHandle inlinee, int branch_bci, |
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409 int bci, CompLevel comp_level, nmethod* nm, JavaThread* thread) { |
1783 | 410 assert(comp_level == CompLevel_none, "This should be only called from the interpreter"); |
411 NOT_PRODUCT(trace_frequency_counter_overflow(method, branch_bci, bci)); | |
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412 if (JvmtiExport::can_post_interpreter_events() && thread->is_interp_only_mode()) { |
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413 // If certain JVMTI events (e.g. frame pop event) are requested then the |
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414 // thread is forced to remain in interpreted code. This is |
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415 // implemented partly by a check in the run_compiled_code |
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416 // section of the interpreter whether we should skip running |
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417 // compiled code, and partly by skipping OSR compiles for |
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418 // interpreted-only threads. |
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419 if (bci != InvocationEntryBci) { |
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420 reset_counter_for_back_branch_event(method); |
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421 return NULL; |
1783 | 422 } |
423 } | |
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424 if (CompileTheWorld || ReplayCompiles) { |
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425 // Don't trigger other compiles in testing mode |
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426 if (bci == InvocationEntryBci) { |
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427 reset_counter_for_invocation_event(method); |
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428 } else { |
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429 reset_counter_for_back_branch_event(method); |
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430 } |
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431 return NULL; |
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432 } |
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433 |
1783 | 434 if (bci == InvocationEntryBci) { |
435 // when code cache is full, compilation gets switched off, UseCompiler | |
436 // is set to false | |
437 if (!method->has_compiled_code() && UseCompiler) { | |
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438 method_invocation_event(method, thread); |
1783 | 439 } else { |
440 // Force counter overflow on method entry, even if no compilation | |
441 // happened. (The method_invocation_event call does this also.) | |
442 reset_counter_for_invocation_event(method); | |
443 } | |
444 // compilation at an invocation overflow no longer goes and retries test for | |
445 // compiled method. We always run the loser of the race as interpreted. | |
446 // so return NULL | |
447 return NULL; | |
448 } else { | |
449 // counter overflow in a loop => try to do on-stack-replacement | |
450 nmethod* osr_nm = method->lookup_osr_nmethod_for(bci, CompLevel_highest_tier, true); | |
451 NOT_PRODUCT(trace_osr_request(method, osr_nm, bci)); | |
452 // when code cache is full, we should not compile any more... | |
453 if (osr_nm == NULL && UseCompiler) { | |
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454 method_back_branch_event(method, bci, thread); |
1783 | 455 osr_nm = method->lookup_osr_nmethod_for(bci, CompLevel_highest_tier, true); |
456 } | |
457 if (osr_nm == NULL) { | |
458 reset_counter_for_back_branch_event(method); | |
459 return NULL; | |
460 } | |
461 return osr_nm; | |
462 } | |
463 return NULL; | |
464 } | |
465 | |
466 #ifndef PRODUCT | |
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467 PRAGMA_FORMAT_NONLITERAL_IGNORED_EXTERNAL |
1783 | 468 void NonTieredCompPolicy::trace_frequency_counter_overflow(methodHandle m, int branch_bci, int bci) { |
469 if (TraceInvocationCounterOverflow) { | |
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470 MethodCounters* mcs = m->method_counters(); |
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471 assert(mcs != NULL, "MethodCounters cannot be NULL for profiling"); |
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472 InvocationCounter* ic = mcs->invocation_counter(); |
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473 InvocationCounter* bc = mcs->backedge_counter(); |
1783 | 474 ResourceMark rm; |
475 const char* msg = | |
476 bci == InvocationEntryBci | |
477 ? "comp-policy cntr ovfl @ %d in entry of " | |
478 : "comp-policy cntr ovfl @ %d in loop of "; | |
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479 PRAGMA_DIAG_PUSH |
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480 PRAGMA_FORMAT_NONLITERAL_IGNORED_INTERNAL |
1783 | 481 tty->print(msg, bci); |
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482 PRAGMA_DIAG_POP |
1783 | 483 m->print_value(); |
484 tty->cr(); | |
485 ic->print(); | |
486 bc->print(); | |
487 if (ProfileInterpreter) { | |
488 if (bci != InvocationEntryBci) { | |
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489 MethodData* mdo = m->method_data(); |
1783 | 490 if (mdo != NULL) { |
491 int count = mdo->bci_to_data(branch_bci)->as_JumpData()->taken(); | |
492 tty->print_cr("back branch count = %d", count); | |
493 } | |
494 } | |
495 } | |
496 } | |
497 } | |
498 | |
499 void NonTieredCompPolicy::trace_osr_request(methodHandle method, nmethod* osr, int bci) { | |
500 if (TraceOnStackReplacement) { | |
501 ResourceMark rm; | |
502 tty->print(osr != NULL ? "Reused OSR entry for " : "Requesting OSR entry for "); | |
503 method->print_short_name(tty); | |
504 tty->print_cr(" at bci %d", bci); | |
505 } | |
506 } | |
507 #endif // !PRODUCT | |
508 | |
0 | 509 // SimpleCompPolicy - compile current method |
510 | |
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511 void SimpleCompPolicy::method_invocation_event(methodHandle m, JavaThread* thread) { |
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512 const int comp_level = CompLevel_highest_tier; |
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513 const int hot_count = m->invocation_count(); |
0 | 514 reset_counter_for_invocation_event(m); |
515 const char* comment = "count"; | |
516 | |
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517 if (is_compilation_enabled() && can_be_compiled(m, comp_level)) { |
0 | 518 nmethod* nm = m->code(); |
519 if (nm == NULL ) { | |
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520 CompileBroker::compile_method(m, InvocationEntryBci, comp_level, m, hot_count, comment, thread); |
0 | 521 } |
522 } | |
523 } | |
524 | |
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525 void SimpleCompPolicy::method_back_branch_event(methodHandle m, int bci, JavaThread* thread) { |
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526 const int comp_level = CompLevel_highest_tier; |
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527 const int hot_count = m->backedge_count(); |
0 | 528 const char* comment = "backedge_count"; |
529 | |
12073 | 530 if (is_compilation_enabled() && can_be_osr_compiled(m, comp_level)) { |
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531 CompileBroker::compile_method(m, bci, comp_level, m, hot_count, comment, thread); |
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532 NOT_PRODUCT(trace_osr_completion(m->lookup_osr_nmethod_for(bci, comp_level, true));) |
0 | 533 } |
534 } | |
535 // StackWalkCompPolicy - walk up stack to find a suitable method to compile | |
536 | |
537 #ifdef COMPILER2 | |
538 const char* StackWalkCompPolicy::_msg = NULL; | |
539 | |
540 | |
541 // Consider m for compilation | |
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542 void StackWalkCompPolicy::method_invocation_event(methodHandle m, JavaThread* thread) { |
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543 const int comp_level = CompLevel_highest_tier; |
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544 const int hot_count = m->invocation_count(); |
0 | 545 reset_counter_for_invocation_event(m); |
546 const char* comment = "count"; | |
547 | |
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548 if (is_compilation_enabled() && m->code() == NULL && can_be_compiled(m, comp_level)) { |
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549 ResourceMark rm(thread); |
0 | 550 frame fr = thread->last_frame(); |
551 assert(fr.is_interpreted_frame(), "must be interpreted"); | |
552 assert(fr.interpreter_frame_method() == m(), "bad method"); | |
553 | |
554 if (TraceCompilationPolicy) { | |
555 tty->print("method invocation trigger: "); | |
556 m->print_short_name(tty); | |
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557 tty->print(" ( interpreted " INTPTR_FORMAT ", size=%d ) ", p2i((address)m()), m->code_size()); |
0 | 558 } |
559 RegisterMap reg_map(thread, false); | |
560 javaVFrame* triggerVF = thread->last_java_vframe(®_map); | |
561 // triggerVF is the frame that triggered its counter | |
562 RFrame* first = new InterpretedRFrame(triggerVF->fr(), thread, m); | |
563 | |
564 if (first->top_method()->code() != NULL) { | |
565 // called obsolete method/nmethod -- no need to recompile | |
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566 if (TraceCompilationPolicy) tty->print_cr(" --> " INTPTR_FORMAT, p2i(first->top_method()->code())); |
0 | 567 } else { |
568 if (TimeCompilationPolicy) accumulated_time()->start(); | |
569 GrowableArray<RFrame*>* stack = new GrowableArray<RFrame*>(50); | |
570 stack->push(first); | |
571 RFrame* top = findTopInlinableFrame(stack); | |
572 if (TimeCompilationPolicy) accumulated_time()->stop(); | |
573 assert(top != NULL, "findTopInlinableFrame returned null"); | |
574 if (TraceCompilationPolicy) top->print(); | |
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575 CompileBroker::compile_method(top->top_method(), InvocationEntryBci, comp_level, |
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576 m, hot_count, comment, thread); |
0 | 577 } |
578 } | |
579 } | |
580 | |
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581 void StackWalkCompPolicy::method_back_branch_event(methodHandle m, int bci, JavaThread* thread) { |
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582 const int comp_level = CompLevel_highest_tier; |
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583 const int hot_count = m->backedge_count(); |
0 | 584 const char* comment = "backedge_count"; |
585 | |
12073 | 586 if (is_compilation_enabled() && can_be_osr_compiled(m, comp_level)) { |
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587 CompileBroker::compile_method(m, bci, comp_level, m, hot_count, comment, thread); |
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588 NOT_PRODUCT(trace_osr_completion(m->lookup_osr_nmethod_for(bci, comp_level, true));) |
0 | 589 } |
590 } | |
591 | |
592 RFrame* StackWalkCompPolicy::findTopInlinableFrame(GrowableArray<RFrame*>* stack) { | |
593 // go up the stack until finding a frame that (probably) won't be inlined | |
594 // into its caller | |
595 RFrame* current = stack->at(0); // current choice for stopping | |
596 assert( current && !current->is_compiled(), "" ); | |
597 const char* msg = NULL; | |
598 | |
599 while (1) { | |
600 | |
601 // before going up the stack further, check if doing so would get us into | |
602 // compiled code | |
603 RFrame* next = senderOf(current, stack); | |
604 if( !next ) // No next frame up the stack? | |
605 break; // Then compile with current frame | |
606 | |
607 methodHandle m = current->top_method(); | |
608 methodHandle next_m = next->top_method(); | |
609 | |
610 if (TraceCompilationPolicy && Verbose) { | |
611 tty->print("[caller: "); | |
612 next_m->print_short_name(tty); | |
613 tty->print("] "); | |
614 } | |
615 | |
616 if( !Inline ) { // Inlining turned off | |
617 msg = "Inlining turned off"; | |
618 break; | |
619 } | |
620 if (next_m->is_not_compilable()) { // Did fail to compile this before/ | |
621 msg = "caller not compilable"; | |
622 break; | |
623 } | |
624 if (next->num() > MaxRecompilationSearchLength) { | |
625 // don't go up too high when searching for recompilees | |
626 msg = "don't go up any further: > MaxRecompilationSearchLength"; | |
627 break; | |
628 } | |
629 if (next->distance() > MaxInterpretedSearchLength) { | |
630 // don't go up too high when searching for recompilees | |
631 msg = "don't go up any further: next > MaxInterpretedSearchLength"; | |
632 break; | |
633 } | |
634 // Compiled frame above already decided not to inline; | |
635 // do not recompile him. | |
636 if (next->is_compiled()) { | |
637 msg = "not going up into optimized code"; | |
638 break; | |
639 } | |
640 | |
641 // Interpreted frame above us was already compiled. Do not force | |
642 // a recompile, although if the frame above us runs long enough an | |
643 // OSR might still happen. | |
644 if( current->is_interpreted() && next_m->has_compiled_code() ) { | |
645 msg = "not going up -- already compiled caller"; | |
646 break; | |
647 } | |
648 | |
649 // Compute how frequent this call site is. We have current method 'm'. | |
650 // We know next method 'next_m' is interpreted. Find the call site and | |
651 // check the various invocation counts. | |
652 int invcnt = 0; // Caller counts | |
653 if (ProfileInterpreter) { | |
654 invcnt = next_m->interpreter_invocation_count(); | |
655 } | |
656 int cnt = 0; // Call site counts | |
657 if (ProfileInterpreter && next_m->method_data() != NULL) { | |
658 ResourceMark rm; | |
659 int bci = next->top_vframe()->bci(); | |
660 ProfileData* data = next_m->method_data()->bci_to_data(bci); | |
661 if (data != NULL && data->is_CounterData()) | |
662 cnt = data->as_CounterData()->count(); | |
663 } | |
664 | |
665 // Caller counts / call-site counts; i.e. is this call site | |
666 // a hot call site for method next_m? | |
667 int freq = (invcnt) ? cnt/invcnt : cnt; | |
668 | |
669 // Check size and frequency limits | |
670 if ((msg = shouldInline(m, freq, cnt)) != NULL) { | |
671 break; | |
672 } | |
673 // Check inlining negative tests | |
674 if ((msg = shouldNotInline(m)) != NULL) { | |
675 break; | |
676 } | |
677 | |
678 | |
679 // If the caller method is too big or something then we do not want to | |
680 // compile it just to inline a method | |
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681 if (!can_be_compiled(next_m, CompLevel_any)) { |
0 | 682 msg = "caller cannot be compiled"; |
683 break; | |
684 } | |
685 | |
686 if( next_m->name() == vmSymbols::class_initializer_name() ) { | |
687 msg = "do not compile class initializer (OSR ok)"; | |
688 break; | |
689 } | |
690 | |
691 if (TraceCompilationPolicy && Verbose) { | |
692 tty->print("\n\t check caller: "); | |
693 next_m->print_short_name(tty); | |
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694 tty->print(" ( interpreted " INTPTR_FORMAT ", size=%d ) ", p2i((address)next_m()), next_m->code_size()); |
0 | 695 } |
696 | |
697 current = next; | |
698 } | |
699 | |
700 assert( !current || !current->is_compiled(), "" ); | |
701 | |
702 if (TraceCompilationPolicy && msg) tty->print("(%s)\n", msg); | |
703 | |
704 return current; | |
705 } | |
706 | |
707 RFrame* StackWalkCompPolicy::senderOf(RFrame* rf, GrowableArray<RFrame*>* stack) { | |
708 RFrame* sender = rf->caller(); | |
709 if (sender && sender->num() == stack->length()) stack->push(sender); | |
710 return sender; | |
711 } | |
712 | |
713 | |
714 const char* StackWalkCompPolicy::shouldInline(methodHandle m, float freq, int cnt) { | |
715 // Allows targeted inlining | |
716 // positive filter: should send be inlined? returns NULL (--> yes) | |
717 // or rejection msg | |
718 int max_size = MaxInlineSize; | |
719 int cost = m->code_size(); | |
720 | |
721 // Check for too many throws (and not too huge) | |
722 if (m->interpreter_throwout_count() > InlineThrowCount && cost < InlineThrowMaxSize ) { | |
723 return NULL; | |
724 } | |
725 | |
726 // bump the max size if the call is frequent | |
727 if ((freq >= InlineFrequencyRatio) || (cnt >= InlineFrequencyCount)) { | |
728 if (TraceFrequencyInlining) { | |
729 tty->print("(Inlined frequent method)\n"); | |
730 m->print(); | |
731 } | |
732 max_size = FreqInlineSize; | |
733 } | |
734 if (cost > max_size) { | |
735 return (_msg = "too big"); | |
736 } | |
737 return NULL; | |
738 } | |
739 | |
740 | |
741 const char* StackWalkCompPolicy::shouldNotInline(methodHandle m) { | |
742 // negative filter: should send NOT be inlined? returns NULL (--> inline) or rejection msg | |
743 if (m->is_abstract()) return (_msg = "abstract method"); | |
744 // note: we allow ik->is_abstract() | |
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745 if (!m->method_holder()->is_initialized()) return (_msg = "method holder not initialized"); |
0 | 746 if (m->is_native()) return (_msg = "native method"); |
747 nmethod* m_code = m->code(); | |
1748 | 748 if (m_code != NULL && m_code->code_size() > InlineSmallCode) |
0 | 749 return (_msg = "already compiled into a big method"); |
750 | |
751 // use frequency-based objections only for non-trivial methods | |
752 if (m->code_size() <= MaxTrivialSize) return NULL; | |
753 if (UseInterpreter) { // don't use counts with -Xcomp | |
754 if ((m->code() == NULL) && m->was_never_executed()) return (_msg = "never executed"); | |
755 if (!m->was_executed_more_than(MIN2(MinInliningThreshold, CompileThreshold >> 1))) return (_msg = "executed < MinInliningThreshold times"); | |
756 } | |
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757 if (Method::has_unloaded_classes_in_signature(m, JavaThread::current())) return (_msg = "unloaded signature classes"); |
0 | 758 |
759 return NULL; | |
760 } | |
761 | |
762 | |
763 | |
764 #endif // COMPILER2 |