1783
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1 /*
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2 * Copyright (c) 2001, 2010, 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 "incls/_precompiled.incl"
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26 # include "incls/_simpleThresholdPolicy.cpp.incl"
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27
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28 // Print an event.
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29 void SimpleThresholdPolicy::print_event(EventType type, methodHandle mh, methodHandle imh,
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30 int bci, CompLevel level) {
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31 bool inlinee_event = mh() != imh();
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32
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33 ttyLocker tty_lock;
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34 tty->print("%lf: [", os::elapsedTime());
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35
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36 int invocation_count = mh->invocation_count();
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37 int backedge_count = mh->backedge_count();
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38 switch(type) {
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39 case CALL:
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40 tty->print("call");
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41 break;
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42 case LOOP:
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43 tty->print("loop");
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44 break;
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45 case COMPILE:
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46 tty->print("compile");
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47 }
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48
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49 tty->print(" level: %d ", level);
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50
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51 ResourceMark rm;
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52 char *method_name = mh->name_and_sig_as_C_string();
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53 tty->print("[%s", method_name);
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54 // We can have an inlinee, although currently we don't generate any notifications for the inlined methods.
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55 if (inlinee_event) {
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56 char *inlinee_name = imh->name_and_sig_as_C_string();
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57 tty->print(" [%s]] ", inlinee_name);
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58 }
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59 else tty->print("] ");
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60 tty->print("@%d queues: %d,%d", bci, CompileBroker::queue_size(CompLevel_full_profile),
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61 CompileBroker::queue_size(CompLevel_full_optimization));
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62
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63 print_specific(type, mh, imh, bci, level);
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64
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65 if (type != COMPILE) {
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66 methodDataHandle mdh = mh->method_data();
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67 int mdo_invocations = 0, mdo_backedges = 0;
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68 if (mdh() != NULL) {
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69 mdo_invocations = mdh->invocation_count();
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70 mdo_backedges = mdh->backedge_count();
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71 }
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72 tty->print(" total: %d,%d mdo: %d,%d",
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73 invocation_count, backedge_count,
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74 mdo_invocations, mdo_backedges);
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75 tty->print(" max levels: %d,%d",
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76 mh->highest_comp_level(), mh->highest_osr_comp_level());
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77 if (inlinee_event) {
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78 tty->print(" inlinee max levels: %d,%d", imh->highest_comp_level(), imh->highest_osr_comp_level());
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79 }
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80 tty->print(" compilable: ");
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81 bool need_comma = false;
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82 if (!mh->is_not_compilable(CompLevel_full_profile)) {
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83 tty->print("c1");
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84 need_comma = true;
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85 }
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86 if (!mh->is_not_compilable(CompLevel_full_optimization)) {
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87 if (need_comma) tty->print(", ");
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88 tty->print("c2");
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89 need_comma = true;
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90 }
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91 if (!mh->is_not_osr_compilable()) {
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92 if (need_comma) tty->print(", ");
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93 tty->print("osr");
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94 }
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95 tty->print(" status:");
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96 if (mh->queued_for_compilation()) {
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97 tty->print(" in queue");
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98 } else tty->print(" idle");
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99 }
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100 tty->print_cr("]");
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101 }
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102
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103 void SimpleThresholdPolicy::initialize() {
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104 if (FLAG_IS_DEFAULT(CICompilerCount)) {
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105 FLAG_SET_DEFAULT(CICompilerCount, 3);
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106 }
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107 int count = CICompilerCount;
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108 if (CICompilerCountPerCPU) {
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109 count = MAX2(log2_intptr(os::active_processor_count()), 1) * 3 / 2;
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110 }
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111 set_c1_count(MAX2(count / 3, 1));
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112 set_c2_count(MAX2(count - count / 3, 1));
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113 }
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114
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115 void SimpleThresholdPolicy::set_carry_if_necessary(InvocationCounter *counter) {
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116 if (!counter->carry() && counter->count() > InvocationCounter::count_limit / 2) {
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117 counter->set_carry_flag();
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118 }
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119 }
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120
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121 // Set carry flags on the counters if necessary
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122 void SimpleThresholdPolicy::handle_counter_overflow(methodOop method) {
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123 set_carry_if_necessary(method->invocation_counter());
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124 set_carry_if_necessary(method->backedge_counter());
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125 methodDataOop mdo = method->method_data();
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126 if (mdo != NULL) {
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127 set_carry_if_necessary(mdo->invocation_counter());
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128 set_carry_if_necessary(mdo->backedge_counter());
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129 }
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130 }
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131
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132 // Called with the queue locked and with at least one element
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133 CompileTask* SimpleThresholdPolicy::select_task(CompileQueue* compile_queue) {
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134 return compile_queue->first();
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135 }
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136
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137 nmethod* SimpleThresholdPolicy::event(methodHandle method, methodHandle inlinee,
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138 int branch_bci, int bci, CompLevel comp_level, TRAPS) {
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139 if (comp_level == CompLevel_none &&
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140 JvmtiExport::can_post_interpreter_events()) {
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141 assert(THREAD->is_Java_thread(), "Should be java thread");
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142 if (((JavaThread*)THREAD)->is_interp_only_mode()) {
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143 return NULL;
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144 }
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145 }
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146 nmethod *osr_nm = NULL;
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147
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148 handle_counter_overflow(method());
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149 if (method() != inlinee()) {
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150 handle_counter_overflow(inlinee());
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151 }
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152
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153 if (PrintTieredEvents) {
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154 print_event(bci == InvocationEntryBci ? CALL : LOOP, method, inlinee, bci, comp_level);
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155 }
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156
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157 if (bci == InvocationEntryBci) {
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158 method_invocation_event(method, inlinee, comp_level, THREAD);
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159 } else {
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160 method_back_branch_event(method, inlinee, bci, comp_level, THREAD);
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161 int highest_level = method->highest_osr_comp_level();
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162 if (highest_level > comp_level) {
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163 osr_nm = method->lookup_osr_nmethod_for(bci, highest_level, false);
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164 }
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165 }
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166 return osr_nm;
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167 }
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168
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169 // Check if the method can be compiled, change level if necessary
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170 void SimpleThresholdPolicy::compile(methodHandle mh, int bci, CompLevel level, TRAPS) {
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171 // Take the given ceiling into the account.
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172 // NOTE: You can set it to 1 to get a pure C1 version.
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173 if ((CompLevel)TieredStopAtLevel < level) {
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174 level = (CompLevel)TieredStopAtLevel;
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175 }
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176 if (level == CompLevel_none) {
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177 return;
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178 }
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179 // Check if the method can be compiled, if not - try different levels.
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180 if (!can_be_compiled(mh, level)) {
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181 if (level < CompLevel_full_optimization && can_be_compiled(mh, CompLevel_full_optimization)) {
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182 compile(mh, bci, CompLevel_full_optimization, THREAD);
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183 }
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184 if (level == CompLevel_full_optimization && can_be_compiled(mh, CompLevel_simple)) {
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185 compile(mh, bci, CompLevel_simple, THREAD);
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186 }
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187 return;
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188 }
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189 if (bci != InvocationEntryBci && mh->is_not_osr_compilable()) {
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190 return;
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191 }
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192 if (PrintTieredEvents) {
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193 print_event(COMPILE, mh, mh, bci, level);
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194 }
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195 if (!CompileBroker::compilation_is_in_queue(mh, bci)) {
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196 submit_compile(mh, bci, level, THREAD);
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197 }
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198 }
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199
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200 // Tell the broker to compile the method
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201 void SimpleThresholdPolicy::submit_compile(methodHandle mh, int bci, CompLevel level, TRAPS) {
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202 int hot_count = (bci == InvocationEntryBci) ? mh->invocation_count() : mh->backedge_count();
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203 CompileBroker::compile_method(mh, bci, level, mh, hot_count, "tiered", THREAD);
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204 }
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205
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206 // Call and loop predicates determine whether a transition to a higher
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207 // compilation level should be performed (pointers to predicate functions
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208 // are passed to common() transition function).
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209 bool SimpleThresholdPolicy::loop_predicate(int i, int b, CompLevel cur_level) {
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210 switch(cur_level) {
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211 case CompLevel_none:
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212 case CompLevel_limited_profile: {
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213 return loop_predicate_helper<CompLevel_none>(i, b, 1.0);
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214 }
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215 case CompLevel_full_profile: {
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216 return loop_predicate_helper<CompLevel_full_profile>(i, b, 1.0);
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217 }
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218 default:
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219 return true;
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220 }
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221 }
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222
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223 bool SimpleThresholdPolicy::call_predicate(int i, int b, CompLevel cur_level) {
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224 switch(cur_level) {
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225 case CompLevel_none:
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226 case CompLevel_limited_profile: {
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227 return call_predicate_helper<CompLevel_none>(i, b, 1.0);
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228 }
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229 case CompLevel_full_profile: {
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230 return call_predicate_helper<CompLevel_full_profile>(i, b, 1.0);
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231 }
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232 default:
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233 return true;
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234 }
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235 }
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236
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237 // Determine is a method is mature.
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238 bool SimpleThresholdPolicy::is_mature(methodOop method) {
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239 if (is_trivial(method)) return true;
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240 methodDataOop mdo = method->method_data();
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241 if (mdo != NULL) {
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242 int i = mdo->invocation_count();
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243 int b = mdo->backedge_count();
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244 double k = ProfileMaturityPercentage / 100.0;
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245 return call_predicate_helper<CompLevel_full_profile>(i, b, k) ||
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246 loop_predicate_helper<CompLevel_full_profile>(i, b, k);
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247 }
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248 return false;
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249 }
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250
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251 // Common transition function. Given a predicate determines if a method should transition to another level.
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252 CompLevel SimpleThresholdPolicy::common(Predicate p, methodOop method, CompLevel cur_level) {
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253 CompLevel next_level = cur_level;
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254 int i = method->invocation_count();
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255 int b = method->backedge_count();
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256
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257 switch(cur_level) {
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258 case CompLevel_none:
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259 {
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260 methodDataOop mdo = method->method_data();
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261 if (mdo != NULL) {
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262 int mdo_i = mdo->invocation_count();
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263 int mdo_b = mdo->backedge_count();
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264 // If we were at full profile level, would we switch to full opt?
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265 if ((this->*p)(mdo_i, mdo_b, CompLevel_full_profile)) {
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266 next_level = CompLevel_full_optimization;
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267 }
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268 }
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269 }
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270 if (next_level == cur_level && (this->*p)(i, b, cur_level)) {
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271 if (is_trivial(method)) {
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272 next_level = CompLevel_simple;
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273 } else {
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274 next_level = CompLevel_full_profile;
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275 }
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276 }
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277 break;
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278 case CompLevel_limited_profile:
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279 case CompLevel_full_profile:
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280 if (is_trivial(method)) {
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281 next_level = CompLevel_simple;
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282 } else {
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283 methodDataOop mdo = method->method_data();
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284 guarantee(mdo != NULL, "MDO should always exist");
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285 if (mdo->would_profile()) {
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286 int mdo_i = mdo->invocation_count();
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287 int mdo_b = mdo->backedge_count();
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288 if ((this->*p)(mdo_i, mdo_b, cur_level)) {
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289 next_level = CompLevel_full_optimization;
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290 }
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291 } else {
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292 next_level = CompLevel_full_optimization;
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293 }
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294 }
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295 break;
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296 }
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297 return next_level;
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298 }
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299
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300 // Determine if a method should be compiled with a normal entry point at a different level.
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301 CompLevel SimpleThresholdPolicy::call_event(methodOop method, CompLevel cur_level) {
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302 CompLevel highest_level = (CompLevel)method->highest_comp_level();
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303 if (cur_level == CompLevel_none && highest_level > cur_level) {
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304 // TODO: We may want to try to do more extensive reprofiling in this case.
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305 return highest_level;
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306 }
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307
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308 CompLevel osr_level = (CompLevel) method->highest_osr_comp_level();
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309 CompLevel next_level = common(&SimpleThresholdPolicy::call_predicate, method, cur_level);
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310
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311 // If OSR method level is greater than the regular method level, the levels should be
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312 // equalized by raising the regular method level in order to avoid OSRs during each
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313 // invocation of the method.
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314 if (osr_level == CompLevel_full_optimization && cur_level == CompLevel_full_profile) {
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315 methodDataOop mdo = method->method_data();
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316 guarantee(mdo != NULL, "MDO should not be NULL");
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317 if (mdo->invocation_count() >= 1) {
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318 next_level = CompLevel_full_optimization;
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319 }
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320 } else {
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321 next_level = MAX2(osr_level, next_level);
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322 }
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323
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324 return next_level;
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325 }
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326
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327 // Determine if we should do an OSR compilation of a given method.
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328 CompLevel SimpleThresholdPolicy::loop_event(methodOop method, CompLevel cur_level) {
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329 if (cur_level == CompLevel_none) {
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330 // If there is a live OSR method that means that we deopted to the interpreter
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331 // for the transition.
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332 CompLevel osr_level = (CompLevel)method->highest_osr_comp_level();
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333 if (osr_level > CompLevel_none) {
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334 return osr_level;
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335 }
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336 }
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337 return common(&SimpleThresholdPolicy::loop_predicate, method, cur_level);
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338 }
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339
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340
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341 // Handle the invocation event.
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342 void SimpleThresholdPolicy::method_invocation_event(methodHandle mh, methodHandle imh,
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343 CompLevel level, TRAPS) {
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344 if (is_compilation_enabled() && !CompileBroker::compilation_is_in_queue(mh, InvocationEntryBci)) {
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345 CompLevel next_level = call_event(mh(), level);
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346 if (next_level != level) {
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347 compile(mh, InvocationEntryBci, next_level, THREAD);
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348 }
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349 }
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350 }
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351
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352 // Handle the back branch event. Notice that we can compile the method
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353 // with a regular entry from here.
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354 void SimpleThresholdPolicy::method_back_branch_event(methodHandle mh, methodHandle imh,
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355 int bci, CompLevel level, TRAPS) {
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356 // If the method is already compiling, quickly bail out.
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357 if (is_compilation_enabled() && !CompileBroker::compilation_is_in_queue(mh, bci)) {
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358 // Use loop event as an opportinity to also check there's been
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359 // enough calls.
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360 CompLevel cur_level = comp_level(mh());
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361 CompLevel next_level = call_event(mh(), cur_level);
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362 CompLevel next_osr_level = loop_event(mh(), level);
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363
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364 next_level = MAX2(next_level,
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365 next_osr_level < CompLevel_full_optimization ? next_osr_level : cur_level);
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366 bool is_compiling = false;
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367 if (next_level != cur_level) {
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368 compile(mh, InvocationEntryBci, next_level, THREAD);
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369 is_compiling = true;
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370 }
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371
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372 // Do the OSR version
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373 if (!is_compiling && next_osr_level != level) {
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374 compile(mh, bci, next_osr_level, THREAD);
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375 }
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376 }
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377 }
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