annotate src/share/vm/runtime/compilationPolicy.cpp @ 4825:20334ed5ed3c

7131259: compile_method and CompilationPolicy::event shouldn't be declared TRAPS Summary: Make sure that CompilationPolicy::event() doesn't throw exceptions Reviewed-by: kvn, never
author iveresov
date Thu, 26 Jan 2012 12:15:24 -0800
parents 2c359f27615c
children 33df1aeaebbf da91efe96a93
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1 /*
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2 * Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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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.
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22 *
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23 */
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24
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25 #include "precompiled.hpp"
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26 #include "code/compiledIC.hpp"
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27 #include "code/nmethod.hpp"
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28 #include "code/scopeDesc.hpp"
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29 #include "compiler/compilerOracle.hpp"
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30 #include "interpreter/interpreter.hpp"
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31 #include "oops/methodDataOop.hpp"
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32 #include "oops/methodOop.hpp"
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33 #include "oops/oop.inline.hpp"
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34 #include "prims/nativeLookup.hpp"
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35 #include "runtime/advancedThresholdPolicy.hpp"
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36 #include "runtime/compilationPolicy.hpp"
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37 #include "runtime/frame.hpp"
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38 #include "runtime/handles.inline.hpp"
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39 #include "runtime/rframe.hpp"
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40 #include "runtime/simpleThresholdPolicy.hpp"
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41 #include "runtime/stubRoutines.hpp"
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42 #include "runtime/thread.hpp"
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43 #include "runtime/timer.hpp"
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44 #include "runtime/vframe.hpp"
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45 #include "runtime/vm_operations.hpp"
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46 #include "utilities/events.hpp"
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47 #include "utilities/globalDefinitions.hpp"
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48
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49 CompilationPolicy* CompilationPolicy::_policy;
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50 elapsedTimer CompilationPolicy::_accumulated_time;
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51 bool CompilationPolicy::_in_vm_startup;
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52
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53 // Determine compilation policy based on command line argument
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54 void compilationPolicy_init() {
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55 CompilationPolicy::set_in_vm_startup(DelayCompilationDuringStartup);
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56
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57 switch(CompilationPolicyChoice) {
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58 case 0:
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59 CompilationPolicy::set_policy(new SimpleCompPolicy());
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60 break;
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61
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62 case 1:
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63 #ifdef COMPILER2
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64 CompilationPolicy::set_policy(new StackWalkCompPolicy());
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65 #else
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66 Unimplemented();
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67 #endif
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68 break;
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69 case 2:
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70 #ifdef TIERED
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71 CompilationPolicy::set_policy(new SimpleThresholdPolicy());
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72 #else
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73 Unimplemented();
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74 #endif
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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;
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83 default:
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84 fatal("CompilationPolicyChoice must be in the range: [0-3]");
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85 }
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86 CompilationPolicy::policy()->initialize();
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87 }
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88
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89 void CompilationPolicy::completed_vm_startup() {
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90 if (TraceCompilationPolicy) {
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91 tty->print("CompilationPolicy: completed vm startup.\n");
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92 }
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93 _in_vm_startup = false;
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94 }
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95
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96 // Returns true if m must be compiled before executing it
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97 // This is intended to force compiles for methods (usually for
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98 // debugging) that would otherwise be interpreted for some reason.
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99 bool CompilationPolicy::must_be_compiled(methodHandle m, int comp_level) {
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100 if (m->has_compiled_code()) return false; // already compiled
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101 if (!can_be_compiled(m, comp_level)) return false;
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102
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103 return !UseInterpreter || // must compile all methods
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104 (UseCompiler && AlwaysCompileLoopMethods && m->has_loops() && CompileBroker::should_compile_new_jobs()); // eagerly compile loop methods
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105 }
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106
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107 // Returns true if m is allowed to be compiled
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108 bool CompilationPolicy::can_be_compiled(methodHandle m, int comp_level) {
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109 if (m->is_abstract()) return false;
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110 if (DontCompileHugeMethods && m->code_size() > HugeMethodLimit) return false;
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111
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112 // Math intrinsics should never be compiled as this can lead to
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113 // monotonicity problems because the interpreter will prefer the
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114 // compiled code to the intrinsic version. This can't happen in
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115 // production because the invocation counter can't be incremented
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116 // but we shouldn't expose the system to this problem in testing
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117 // modes.
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118 if (!AbstractInterpreter::can_be_compiled(m)) {
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119 return false;
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120 }
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121 if (comp_level == CompLevel_all) {
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122 return !m->is_not_compilable(CompLevel_simple) && !m->is_not_compilable(CompLevel_full_optimization);
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123 } else {
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124 return !m->is_not_compilable(comp_level);
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125 }
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126 }
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127
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128 bool CompilationPolicy::is_compilation_enabled() {
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129 // NOTE: CompileBroker::should_compile_new_jobs() checks for UseCompiler
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130 return !delay_compilation_during_startup() && CompileBroker::should_compile_new_jobs();
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131 }
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132
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133 #ifndef PRODUCT
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134 void CompilationPolicy::print_time() {
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135 tty->print_cr ("Accumulated compilationPolicy times:");
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136 tty->print_cr ("---------------------------");
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137 tty->print_cr (" Total: %3.3f sec.", _accumulated_time.seconds());
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138 }
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139
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140 void NonTieredCompPolicy::trace_osr_completion(nmethod* osr_nm) {
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141 if (TraceOnStackReplacement) {
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142 if (osr_nm == NULL) tty->print_cr("compilation failed");
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143 else tty->print_cr("nmethod " INTPTR_FORMAT, osr_nm);
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144 }
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145 }
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146 #endif // !PRODUCT
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147
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148 void NonTieredCompPolicy::initialize() {
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149 // Setup the compiler thread numbers
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150 if (CICompilerCountPerCPU) {
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151 // Example: if CICompilerCountPerCPU is true, then we get
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152 // max(log2(8)-1,1) = 2 compiler threads on an 8-way machine.
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153 // May help big-app startup time.
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154 _compiler_count = MAX2(log2_intptr(os::active_processor_count())-1,1);
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155 } else {
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156 _compiler_count = CICompilerCount;
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157 }
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158 }
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159
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160 // Note: this policy is used ONLY if TieredCompilation is off.
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161 // compiler_count() behaves the following way:
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162 // - with TIERED build (with both COMPILER1 and COMPILER2 defined) it should return
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163 // zero for the c1 compilation levels, hence the particular ordering of the
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164 // statements.
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165 // - the same should happen when COMPILER2 is defined and COMPILER1 is not
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166 // (server build without TIERED defined).
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167 // - if only COMPILER1 is defined (client build), zero should be returned for
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168 // the c2 level.
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169 // - if neither is defined - always return zero.
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170 int NonTieredCompPolicy::compiler_count(CompLevel comp_level) {
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171 assert(!TieredCompilation, "This policy should not be used with TieredCompilation");
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172 #ifdef COMPILER2
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173 if (is_c2_compile(comp_level)) {
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174 return _compiler_count;
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175 } else {
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176 return 0;
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177 }
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178 #endif
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179
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180 #ifdef COMPILER1
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181 if (is_c1_compile(comp_level)) {
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182 return _compiler_count;
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183 } else {
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184 return 0;
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185 }
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186 #endif
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187
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188 return 0;
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189 }
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190
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191 void NonTieredCompPolicy::reset_counter_for_invocation_event(methodHandle m) {
0
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192 // Make sure invocation and backedge counter doesn't overflow again right away
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193 // as would be the case for native methods.
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194
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195 // BUT also make sure the method doesn't look like it was never executed.
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196 // Set carry bit and reduce counter's value to min(count, CompileThreshold/2).
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197 m->invocation_counter()->set_carry();
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198 m->backedge_counter()->set_carry();
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199
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200 assert(!m->was_never_executed(), "don't reset to 0 -- could be mistaken for never-executed");
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201 }
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202
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203 void NonTieredCompPolicy::reset_counter_for_back_branch_event(methodHandle m) {
0
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204 // Delay next back-branch event but pump up invocation counter to triger
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205 // whole method compilation.
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206 InvocationCounter* i = m->invocation_counter();
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207 InvocationCounter* b = m->backedge_counter();
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208
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209 // Don't set invocation_counter's value too low otherwise the method will
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210 // look like immature (ic < ~5300) which prevents the inlining based on
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211 // the type profiling.
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212 i->set(i->state(), CompileThreshold);
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213 // Don't reset counter too low - it is used to check if OSR method is ready.
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214 b->set(b->state(), CompileThreshold / 2);
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215 }
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216
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217 //
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218 // CounterDecay
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219 //
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220 // Interates through invocation counters and decrements them. This
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221 // is done at each safepoint.
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222 //
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223 class CounterDecay : public AllStatic {
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224 static jlong _last_timestamp;
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225 static void do_method(methodOop m) {
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226 m->invocation_counter()->decay();
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227 }
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228 public:
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229 static void decay();
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230 static bool is_decay_needed() {
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231 return (os::javaTimeMillis() - _last_timestamp) > CounterDecayMinIntervalLength;
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232 }
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233 };
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234
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235 jlong CounterDecay::_last_timestamp = 0;
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236
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237 void CounterDecay::decay() {
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238 _last_timestamp = os::javaTimeMillis();
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239
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240 // This operation is going to be performed only at the end of a safepoint
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241 // and hence GC's will not be going on, all Java mutators are suspended
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242 // at this point and hence SystemDictionary_lock is also not needed.
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243 assert(SafepointSynchronize::is_at_safepoint(), "can only be executed at a safepoint");
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244 int nclasses = SystemDictionary::number_of_classes();
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245 double classes_per_tick = nclasses * (CounterDecayMinIntervalLength * 1e-3 /
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246 CounterHalfLifeTime);
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247 for (int i = 0; i < classes_per_tick; i++) {
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248 klassOop k = SystemDictionary::try_get_next_class();
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249 if (k != NULL && k->klass_part()->oop_is_instance()) {
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250 instanceKlass::cast(k)->methods_do(do_method);
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251 }
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252 }
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253 }
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254
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255 // Called at the end of the safepoint
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256 void NonTieredCompPolicy::do_safepoint_work() {
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257 if(UseCounterDecay && CounterDecay::is_decay_needed()) {
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258 CounterDecay::decay();
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259 }
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260 }
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261
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262 void NonTieredCompPolicy::reprofile(ScopeDesc* trap_scope, bool is_osr) {
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263 ScopeDesc* sd = trap_scope;
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264 for (; !sd->is_top(); sd = sd->sender()) {
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265 // Reset ICs of inlined methods, since they can trigger compilations also.
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266 sd->method()->invocation_counter()->reset();
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267 }
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268 InvocationCounter* c = sd->method()->invocation_counter();
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269 if (is_osr) {
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270 // It was an OSR method, so bump the count higher.
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271 c->set(c->state(), CompileThreshold);
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272 } else {
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273 c->reset();
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274 }
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275 sd->method()->backedge_counter()->reset();
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276 }
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277
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278 // This method can be called by any component of the runtime to notify the policy
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279 // that it's recommended to delay the complation of this method.
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280 void NonTieredCompPolicy::delay_compilation(methodOop method) {
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281 method->invocation_counter()->decay();
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282 method->backedge_counter()->decay();
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283 }
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284
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285 void NonTieredCompPolicy::disable_compilation(methodOop method) {
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286 method->invocation_counter()->set_state(InvocationCounter::wait_for_nothing);
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287 method->backedge_counter()->set_state(InvocationCounter::wait_for_nothing);
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288 }
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289
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290 CompileTask* NonTieredCompPolicy::select_task(CompileQueue* compile_queue) {
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291 return compile_queue->first();
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292 }
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293
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294 bool NonTieredCompPolicy::is_mature(methodOop method) {
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295 methodDataOop mdo = method->method_data();
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296 assert(mdo != NULL, "Should be");
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297 uint current = mdo->mileage_of(method);
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298 uint initial = mdo->creation_mileage();
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299 if (current < initial)
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300 return true; // some sort of overflow
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301 uint target;
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302 if (ProfileMaturityPercentage <= 0)
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303 target = (uint) -ProfileMaturityPercentage; // absolute value
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304 else
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305 target = (uint)( (ProfileMaturityPercentage * CompileThreshold) / 100 );
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306 return (current >= initial + target);
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307 }
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308
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309 nmethod* NonTieredCompPolicy::event(methodHandle method, methodHandle inlinee, int branch_bci,
20334ed5ed3c 7131259: compile_method and CompilationPolicy::event shouldn't be declared TRAPS
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310 int bci, CompLevel comp_level, nmethod* nm, JavaThread* thread) {
1783
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311 assert(comp_level == CompLevel_none, "This should be only called from the interpreter");
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312 NOT_PRODUCT(trace_frequency_counter_overflow(method, branch_bci, bci));
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313 if (JvmtiExport::can_post_interpreter_events() && thread->is_interp_only_mode()) {
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314 // If certain JVMTI events (e.g. frame pop event) are requested then the
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315 // thread is forced to remain in interpreted code. This is
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316 // implemented partly by a check in the run_compiled_code
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317 // section of the interpreter whether we should skip running
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318 // compiled code, and partly by skipping OSR compiles for
20334ed5ed3c 7131259: compile_method and CompilationPolicy::event shouldn't be declared TRAPS
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319 // interpreted-only threads.
20334ed5ed3c 7131259: compile_method and CompilationPolicy::event shouldn't be declared TRAPS
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320 if (bci != InvocationEntryBci) {
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321 reset_counter_for_back_branch_event(method);
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322 return NULL;
1783
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323 }
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324 }
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325 if (bci == InvocationEntryBci) {
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326 // when code cache is full, compilation gets switched off, UseCompiler
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327 // is set to false
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328 if (!method->has_compiled_code() && UseCompiler) {
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329 method_invocation_event(method, thread);
1783
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330 } else {
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331 // Force counter overflow on method entry, even if no compilation
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332 // happened. (The method_invocation_event call does this also.)
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333 reset_counter_for_invocation_event(method);
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334 }
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335 // compilation at an invocation overflow no longer goes and retries test for
d5d065957597 6953144: Tiered compilation
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336 // compiled method. We always run the loser of the race as interpreted.
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337 // so return NULL
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338 return NULL;
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339 } else {
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340 // counter overflow in a loop => try to do on-stack-replacement
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341 nmethod* osr_nm = method->lookup_osr_nmethod_for(bci, CompLevel_highest_tier, true);
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342 NOT_PRODUCT(trace_osr_request(method, osr_nm, bci));
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343 // when code cache is full, we should not compile any more...
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344 if (osr_nm == NULL && UseCompiler) {
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345 method_back_branch_event(method, bci, thread);
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346 osr_nm = method->lookup_osr_nmethod_for(bci, CompLevel_highest_tier, true);
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347 }
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348 if (osr_nm == NULL) {
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349 reset_counter_for_back_branch_event(method);
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350 return NULL;
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351 }
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352 return osr_nm;
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353 }
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354 return NULL;
d5d065957597 6953144: Tiered compilation
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355 }
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356
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357 #ifndef PRODUCT
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358 void NonTieredCompPolicy::trace_frequency_counter_overflow(methodHandle m, int branch_bci, int bci) {
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diff changeset
359 if (TraceInvocationCounterOverflow) {
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360 InvocationCounter* ic = m->invocation_counter();
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361 InvocationCounter* bc = m->backedge_counter();
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362 ResourceMark rm;
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363 const char* msg =
d5d065957597 6953144: Tiered compilation
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364 bci == InvocationEntryBci
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365 ? "comp-policy cntr ovfl @ %d in entry of "
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diff changeset
366 : "comp-policy cntr ovfl @ %d in loop of ";
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diff changeset
367 tty->print(msg, bci);
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diff changeset
368 m->print_value();
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diff changeset
369 tty->cr();
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370 ic->print();
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371 bc->print();
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diff changeset
372 if (ProfileInterpreter) {
d5d065957597 6953144: Tiered compilation
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diff changeset
373 if (bci != InvocationEntryBci) {
d5d065957597 6953144: Tiered compilation
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diff changeset
374 methodDataOop mdo = m->method_data();
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diff changeset
375 if (mdo != NULL) {
d5d065957597 6953144: Tiered compilation
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376 int count = mdo->bci_to_data(branch_bci)->as_JumpData()->taken();
d5d065957597 6953144: Tiered compilation
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377 tty->print_cr("back branch count = %d", count);
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378 }
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diff changeset
379 }
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diff changeset
380 }
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diff changeset
381 }
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diff changeset
382 }
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383
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384 void NonTieredCompPolicy::trace_osr_request(methodHandle method, nmethod* osr, int bci) {
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385 if (TraceOnStackReplacement) {
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diff changeset
386 ResourceMark rm;
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387 tty->print(osr != NULL ? "Reused OSR entry for " : "Requesting OSR entry for ");
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388 method->print_short_name(tty);
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389 tty->print_cr(" at bci %d", bci);
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390 }
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391 }
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392 #endif // !PRODUCT
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393
0
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394 // SimpleCompPolicy - compile current method
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395
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396 void SimpleCompPolicy::method_invocation_event(methodHandle m, JavaThread* thread) {
0
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397 int hot_count = m->invocation_count();
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398 reset_counter_for_invocation_event(m);
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399 const char* comment = "count";
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400
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401 if (is_compilation_enabled() && can_be_compiled(m)) {
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402 nmethod* nm = m->code();
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403 if (nm == NULL ) {
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404 const char* comment = "count";
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405 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_highest_tier,
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406 m, hot_count, comment, thread);
0
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407 }
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408 }
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409 }
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410
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411 void SimpleCompPolicy::method_back_branch_event(methodHandle m, int bci, JavaThread* thread) {
0
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412 int hot_count = m->backedge_count();
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413 const char* comment = "backedge_count";
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414
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415 if (is_compilation_enabled() && !m->is_not_osr_compilable() && can_be_compiled(m)) {
d5d065957597 6953144: Tiered compilation
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416 CompileBroker::compile_method(m, bci, CompLevel_highest_tier,
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20334ed5ed3c 7131259: compile_method and CompilationPolicy::event shouldn't be declared TRAPS
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417 m, hot_count, comment, thread);
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418 NOT_PRODUCT(trace_osr_completion(m->lookup_osr_nmethod_for(bci, CompLevel_highest_tier, true));)
0
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419 }
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420 }
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421 // StackWalkCompPolicy - walk up stack to find a suitable method to compile
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422
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423 #ifdef COMPILER2
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424 const char* StackWalkCompPolicy::_msg = NULL;
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425
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426
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427 // Consider m for compilation
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428 void StackWalkCompPolicy::method_invocation_event(methodHandle m, JavaThread* thread) {
0
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429 int hot_count = m->invocation_count();
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430 reset_counter_for_invocation_event(m);
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431 const char* comment = "count";
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432
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433 if (is_compilation_enabled() && m->code() == NULL && can_be_compiled(m)) {
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20334ed5ed3c 7131259: compile_method and CompilationPolicy::event shouldn't be declared TRAPS
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434 ResourceMark rm(thread);
0
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435 frame fr = thread->last_frame();
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436 assert(fr.is_interpreted_frame(), "must be interpreted");
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437 assert(fr.interpreter_frame_method() == m(), "bad method");
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438
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439 if (TraceCompilationPolicy) {
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diff changeset
440 tty->print("method invocation trigger: ");
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441 m->print_short_name(tty);
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442 tty->print(" ( interpreted " INTPTR_FORMAT ", size=%d ) ", (address)m(), m->code_size());
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443 }
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444 RegisterMap reg_map(thread, false);
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445 javaVFrame* triggerVF = thread->last_java_vframe(&reg_map);
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446 // triggerVF is the frame that triggered its counter
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447 RFrame* first = new InterpretedRFrame(triggerVF->fr(), thread, m);
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448
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449 if (first->top_method()->code() != NULL) {
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450 // called obsolete method/nmethod -- no need to recompile
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451 if (TraceCompilationPolicy) tty->print_cr(" --> " INTPTR_FORMAT, first->top_method()->code());
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452 } else {
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453 if (TimeCompilationPolicy) accumulated_time()->start();
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diff changeset
454 GrowableArray<RFrame*>* stack = new GrowableArray<RFrame*>(50);
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455 stack->push(first);
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456 RFrame* top = findTopInlinableFrame(stack);
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457 if (TimeCompilationPolicy) accumulated_time()->stop();
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458 assert(top != NULL, "findTopInlinableFrame returned null");
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459 if (TraceCompilationPolicy) top->print();
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d5d065957597 6953144: Tiered compilation
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460 CompileBroker::compile_method(top->top_method(), InvocationEntryBci, CompLevel_highest_tier,
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20334ed5ed3c 7131259: compile_method and CompilationPolicy::event shouldn't be declared TRAPS
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461 m, hot_count, comment, thread);
0
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462 }
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463 }
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464 }
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465
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466 void StackWalkCompPolicy::method_back_branch_event(methodHandle m, int bci, JavaThread* thread) {
0
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467 int hot_count = m->backedge_count();
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468 const char* comment = "backedge_count";
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469
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diff changeset
470 if (is_compilation_enabled() && !m->is_not_osr_compilable() && can_be_compiled(m)) {
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20334ed5ed3c 7131259: compile_method and CompilationPolicy::event shouldn't be declared TRAPS
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471 CompileBroker::compile_method(m, bci, CompLevel_highest_tier, m, hot_count, comment, thread);
0
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472
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473 NOT_PRODUCT(trace_osr_completion(m->lookup_osr_nmethod_for(bci, CompLevel_highest_tier, true));)
0
a61af66fc99e Initial load
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474 }
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475 }
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parents:
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476
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477 RFrame* StackWalkCompPolicy::findTopInlinableFrame(GrowableArray<RFrame*>* stack) {
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parents:
diff changeset
478 // go up the stack until finding a frame that (probably) won't be inlined
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parents:
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479 // into its caller
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parents:
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480 RFrame* current = stack->at(0); // current choice for stopping
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parents:
diff changeset
481 assert( current && !current->is_compiled(), "" );
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parents:
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482 const char* msg = NULL;
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parents:
diff changeset
483
a61af66fc99e Initial load
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parents:
diff changeset
484 while (1) {
a61af66fc99e Initial load
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parents:
diff changeset
485
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parents:
diff changeset
486 // before going up the stack further, check if doing so would get us into
a61af66fc99e Initial load
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parents:
diff changeset
487 // compiled code
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parents:
diff changeset
488 RFrame* next = senderOf(current, stack);
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parents:
diff changeset
489 if( !next ) // No next frame up the stack?
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parents:
diff changeset
490 break; // Then compile with current frame
a61af66fc99e Initial load
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parents:
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491
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parents:
diff changeset
492 methodHandle m = current->top_method();
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diff changeset
493 methodHandle next_m = next->top_method();
a61af66fc99e Initial load
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parents:
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494
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parents:
diff changeset
495 if (TraceCompilationPolicy && Verbose) {
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parents:
diff changeset
496 tty->print("[caller: ");
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parents:
diff changeset
497 next_m->print_short_name(tty);
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parents:
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498 tty->print("] ");
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parents:
diff changeset
499 }
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parents:
diff changeset
500
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parents:
diff changeset
501 if( !Inline ) { // Inlining turned off
a61af66fc99e Initial load
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parents:
diff changeset
502 msg = "Inlining turned off";
a61af66fc99e Initial load
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parents:
diff changeset
503 break;
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parents:
diff changeset
504 }
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parents:
diff changeset
505 if (next_m->is_not_compilable()) { // Did fail to compile this before/
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parents:
diff changeset
506 msg = "caller not compilable";
a61af66fc99e Initial load
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parents:
diff changeset
507 break;
a61af66fc99e Initial load
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parents:
diff changeset
508 }
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parents:
diff changeset
509 if (next->num() > MaxRecompilationSearchLength) {
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parents:
diff changeset
510 // don't go up too high when searching for recompilees
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parents:
diff changeset
511 msg = "don't go up any further: > MaxRecompilationSearchLength";
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parents:
diff changeset
512 break;
a61af66fc99e Initial load
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parents:
diff changeset
513 }
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parents:
diff changeset
514 if (next->distance() > MaxInterpretedSearchLength) {
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parents:
diff changeset
515 // don't go up too high when searching for recompilees
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parents:
diff changeset
516 msg = "don't go up any further: next > MaxInterpretedSearchLength";
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parents:
diff changeset
517 break;
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parents:
diff changeset
518 }
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parents:
diff changeset
519 // Compiled frame above already decided not to inline;
a61af66fc99e Initial load
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parents:
diff changeset
520 // do not recompile him.
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parents:
diff changeset
521 if (next->is_compiled()) {
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parents:
diff changeset
522 msg = "not going up into optimized code";
a61af66fc99e Initial load
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parents:
diff changeset
523 break;
a61af66fc99e Initial load
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parents:
diff changeset
524 }
a61af66fc99e Initial load
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parents:
diff changeset
525
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parents:
diff changeset
526 // Interpreted frame above us was already compiled. Do not force
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parents:
diff changeset
527 // a recompile, although if the frame above us runs long enough an
a61af66fc99e Initial load
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parents:
diff changeset
528 // OSR might still happen.
a61af66fc99e Initial load
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parents:
diff changeset
529 if( current->is_interpreted() && next_m->has_compiled_code() ) {
a61af66fc99e Initial load
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parents:
diff changeset
530 msg = "not going up -- already compiled caller";
a61af66fc99e Initial load
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parents:
diff changeset
531 break;
a61af66fc99e Initial load
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parents:
diff changeset
532 }
a61af66fc99e Initial load
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parents:
diff changeset
533
a61af66fc99e Initial load
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parents:
diff changeset
534 // Compute how frequent this call site is. We have current method 'm'.
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parents:
diff changeset
535 // We know next method 'next_m' is interpreted. Find the call site and
a61af66fc99e Initial load
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parents:
diff changeset
536 // check the various invocation counts.
a61af66fc99e Initial load
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parents:
diff changeset
537 int invcnt = 0; // Caller counts
a61af66fc99e Initial load
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parents:
diff changeset
538 if (ProfileInterpreter) {
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parents:
diff changeset
539 invcnt = next_m->interpreter_invocation_count();
a61af66fc99e Initial load
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parents:
diff changeset
540 }
a61af66fc99e Initial load
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parents:
diff changeset
541 int cnt = 0; // Call site counts
a61af66fc99e Initial load
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parents:
diff changeset
542 if (ProfileInterpreter && next_m->method_data() != NULL) {
a61af66fc99e Initial load
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parents:
diff changeset
543 ResourceMark rm;
a61af66fc99e Initial load
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parents:
diff changeset
544 int bci = next->top_vframe()->bci();
a61af66fc99e Initial load
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parents:
diff changeset
545 ProfileData* data = next_m->method_data()->bci_to_data(bci);
a61af66fc99e Initial load
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parents:
diff changeset
546 if (data != NULL && data->is_CounterData())
a61af66fc99e Initial load
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parents:
diff changeset
547 cnt = data->as_CounterData()->count();
a61af66fc99e Initial load
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parents:
diff changeset
548 }
a61af66fc99e Initial load
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parents:
diff changeset
549
a61af66fc99e Initial load
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parents:
diff changeset
550 // Caller counts / call-site counts; i.e. is this call site
a61af66fc99e Initial load
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parents:
diff changeset
551 // a hot call site for method next_m?
a61af66fc99e Initial load
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parents:
diff changeset
552 int freq = (invcnt) ? cnt/invcnt : cnt;
a61af66fc99e Initial load
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parents:
diff changeset
553
a61af66fc99e Initial load
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parents:
diff changeset
554 // Check size and frequency limits
a61af66fc99e Initial load
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parents:
diff changeset
555 if ((msg = shouldInline(m, freq, cnt)) != NULL) {
a61af66fc99e Initial load
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parents:
diff changeset
556 break;
a61af66fc99e Initial load
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parents:
diff changeset
557 }
a61af66fc99e Initial load
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parents:
diff changeset
558 // Check inlining negative tests
a61af66fc99e Initial load
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parents:
diff changeset
559 if ((msg = shouldNotInline(m)) != NULL) {
a61af66fc99e Initial load
duke
parents:
diff changeset
560 break;
a61af66fc99e Initial load
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parents:
diff changeset
561 }
a61af66fc99e Initial load
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parents:
diff changeset
562
a61af66fc99e Initial load
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parents:
diff changeset
563
a61af66fc99e Initial load
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parents:
diff changeset
564 // If the caller method is too big or something then we do not want to
a61af66fc99e Initial load
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parents:
diff changeset
565 // compile it just to inline a method
1783
d5d065957597 6953144: Tiered compilation
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566 if (!can_be_compiled(next_m)) {
0
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567 msg = "caller cannot be compiled";
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568 break;
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569 }
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570
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571 if( next_m->name() == vmSymbols::class_initializer_name() ) {
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572 msg = "do not compile class initializer (OSR ok)";
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573 break;
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574 }
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575
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576 if (TraceCompilationPolicy && Verbose) {
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577 tty->print("\n\t check caller: ");
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578 next_m->print_short_name(tty);
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579 tty->print(" ( interpreted " INTPTR_FORMAT ", size=%d ) ", (address)next_m(), next_m->code_size());
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580 }
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581
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582 current = next;
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583 }
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584
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585 assert( !current || !current->is_compiled(), "" );
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586
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587 if (TraceCompilationPolicy && msg) tty->print("(%s)\n", msg);
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588
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589 return current;
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590 }
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591
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592 RFrame* StackWalkCompPolicy::senderOf(RFrame* rf, GrowableArray<RFrame*>* stack) {
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593 RFrame* sender = rf->caller();
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594 if (sender && sender->num() == stack->length()) stack->push(sender);
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595 return sender;
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596 }
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597
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598
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599 const char* StackWalkCompPolicy::shouldInline(methodHandle m, float freq, int cnt) {
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600 // Allows targeted inlining
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601 // positive filter: should send be inlined? returns NULL (--> yes)
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602 // or rejection msg
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603 int max_size = MaxInlineSize;
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604 int cost = m->code_size();
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605
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606 // Check for too many throws (and not too huge)
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607 if (m->interpreter_throwout_count() > InlineThrowCount && cost < InlineThrowMaxSize ) {
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608 return NULL;
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609 }
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610
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611 // bump the max size if the call is frequent
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612 if ((freq >= InlineFrequencyRatio) || (cnt >= InlineFrequencyCount)) {
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613 if (TraceFrequencyInlining) {
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614 tty->print("(Inlined frequent method)\n");
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615 m->print();
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616 }
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617 max_size = FreqInlineSize;
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618 }
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619 if (cost > max_size) {
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620 return (_msg = "too big");
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621 }
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622 return NULL;
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623 }
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624
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625
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626 const char* StackWalkCompPolicy::shouldNotInline(methodHandle m) {
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627 // negative filter: should send NOT be inlined? returns NULL (--> inline) or rejection msg
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628 if (m->is_abstract()) return (_msg = "abstract method");
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629 // note: we allow ik->is_abstract()
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630 if (!instanceKlass::cast(m->method_holder())->is_initialized()) return (_msg = "method holder not initialized");
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631 if (m->is_native()) return (_msg = "native method");
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632 nmethod* m_code = m->code();
1748
3e8fbc61cee8 6978355: renaming for 6961697
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633 if (m_code != NULL && m_code->code_size() > InlineSmallCode)
0
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634 return (_msg = "already compiled into a big method");
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635
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636 // use frequency-based objections only for non-trivial methods
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637 if (m->code_size() <= MaxTrivialSize) return NULL;
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638 if (UseInterpreter) { // don't use counts with -Xcomp
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639 if ((m->code() == NULL) && m->was_never_executed()) return (_msg = "never executed");
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640 if (!m->was_executed_more_than(MIN2(MinInliningThreshold, CompileThreshold >> 1))) return (_msg = "executed < MinInliningThreshold times");
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641 }
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642 if (methodOopDesc::has_unloaded_classes_in_signature(m, JavaThread::current())) return (_msg = "unloaded signature classes");
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643
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644 return NULL;
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645 }
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646
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647
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648
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649 #endif // COMPILER2