invocationCounter.cpp revision 1879:f95d63e2154a
1254721Semaste/* 2254721Semaste * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. 3254721Semaste * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4254721Semaste * 5254721Semaste * This code is free software; you can redistribute it and/or modify it 6254721Semaste * under the terms of the GNU General Public License version 2 only, as 7254721Semaste * published by the Free Software Foundation. 8254721Semaste * 9254721Semaste * This code is distributed in the hope that it will be useful, but WITHOUT 10254721Semaste * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11254721Semaste * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12254721Semaste * version 2 for more details (a copy is included in the LICENSE file that 13254721Semaste * accompanied this code). 14254721Semaste * 15254721Semaste * You should have received a copy of the GNU General Public License version 16254721Semaste * 2 along with this work; if not, write to the Free Software Foundation, 17254721Semaste * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18254721Semaste * 19254721Semaste * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20254721Semaste * or visit www.oracle.com if you need additional information or have any 21254721Semaste * questions. 22254721Semaste * 23254721Semaste */ 24254721Semaste 25254721Semaste#include "precompiled.hpp" 26254721Semaste#include "interpreter/invocationCounter.hpp" 27254721Semaste#include "runtime/frame.hpp" 28254721Semaste#include "runtime/handles.inline.hpp" 29254721Semaste 30254721Semaste 31254721Semaste// Implementation of InvocationCounter 32254721Semaste 33254721Semastevoid InvocationCounter::init() { 34254721Semaste _counter = 0; // reset all the bits, including the sticky carry 35254721Semaste reset(); 36254721Semaste} 37254721Semaste 38254721Semastevoid InvocationCounter::reset() { 39254721Semaste // Only reset the state and don't make the method look like it's never 40254721Semaste // been executed 41254721Semaste set_state(wait_for_compile); 42254721Semaste} 43254721Semaste 44254721Semastevoid InvocationCounter::set_carry() { 45254721Semaste set_carry_flag(); 46254721Semaste // The carry bit now indicates that this counter had achieved a very 47254721Semaste // large value. Now reduce the value, so that the method can be 48254721Semaste // executed many more times before re-entering the VM. 49254721Semaste int old_count = count(); 50254721Semaste int new_count = MIN2(old_count, (int) (CompileThreshold / 2)); 51254721Semaste // prevent from going to zero, to distinguish from never-executed methods 52254721Semaste if (new_count == 0) new_count = 1; 53254721Semaste if (old_count != new_count) set(state(), new_count); 54254721Semaste} 55254721Semaste 56254721Semastevoid InvocationCounter::set_state(State state) { 57254721Semaste assert(0 <= state && state < number_of_states, "illegal state"); 58254721Semaste int init = _init[state]; 59254721Semaste // prevent from going to zero, to distinguish from never-executed methods 60254721Semaste if (init == 0 && count() > 0) init = 1; 61254721Semaste int carry = (_counter & carry_mask); // the carry bit is sticky 62254721Semaste _counter = (init << number_of_noncount_bits) | carry | state; 63254721Semaste} 64254721Semaste 65254721Semaste 66254721Semastevoid InvocationCounter::print() { 67254721Semaste tty->print_cr("invocation count: up = %d, limit = %d, carry = %s, state = %s", 68254721Semaste count(), limit(), 69254721Semaste carry() ? "true" : "false", 70254721Semaste state_as_string(state())); 71254721Semaste} 72254721Semaste 73254721Semastevoid InvocationCounter::print_short() { 74254721Semaste tty->print(" [%d%s;%s]", count(), carry()?"+carry":"", state_as_short_string(state())); 75254721Semaste} 76254721Semaste 77254721Semaste// Initialization 78254721Semaste 79254721Semasteint InvocationCounter::_init [InvocationCounter::number_of_states]; 80254721SemasteInvocationCounter::Action InvocationCounter::_action[InvocationCounter::number_of_states]; 81254721Semasteint InvocationCounter::InterpreterInvocationLimit; 82254721Semasteint InvocationCounter::InterpreterBackwardBranchLimit; 83254721Semasteint InvocationCounter::InterpreterProfileLimit; 84254721Semaste 85254721Semaste 86254721Semasteconst char* InvocationCounter::state_as_string(State state) { 87254721Semaste switch (state) { 88254721Semaste case wait_for_nothing : return "wait_for_nothing"; 89254721Semaste case wait_for_compile : return "wait_for_compile"; 90254721Semaste } 91254721Semaste ShouldNotReachHere(); 92254721Semaste return NULL; 93254721Semaste} 94254721Semaste 95254721Semasteconst char* InvocationCounter::state_as_short_string(State state) { 96254721Semaste switch (state) { 97254721Semaste case wait_for_nothing : return "not comp."; 98254721Semaste case wait_for_compile : return "compileable"; 99254721Semaste } 100254721Semaste ShouldNotReachHere(); 101254721Semaste return NULL; 102254721Semaste} 103254721Semaste 104254721Semaste 105254721Semastestatic address do_nothing(methodHandle method, TRAPS) { 106254721Semaste // dummy action for inactive invocation counters 107254721Semaste method->invocation_counter()->set_carry(); 108254721Semaste method->invocation_counter()->set_state(InvocationCounter::wait_for_nothing); 109254721Semaste return NULL; 110254721Semaste} 111254721Semaste 112254721Semaste 113254721Semastestatic address do_decay(methodHandle method, TRAPS) { 114254721Semaste // decay invocation counters so compilation gets delayed 115254721Semaste method->invocation_counter()->decay(); 116254721Semaste return NULL; 117254721Semaste} 118254721Semaste 119254721Semaste 120254721Semastevoid InvocationCounter::def(State state, int init, Action action) { 121254721Semaste assert(0 <= state && state < number_of_states, "illegal state"); 122254721Semaste assert(0 <= init && init < count_limit, "initial value out of range"); 123254721Semaste _init [state] = init; 124254721Semaste _action[state] = action; 125254721Semaste} 126254721Semaste 127254721Semasteaddress dummy_invocation_counter_overflow(methodHandle m, TRAPS) { 128254721Semaste ShouldNotReachHere(); 129254721Semaste return NULL; 130254721Semaste} 131254721Semaste 132254721Semastevoid InvocationCounter::reinitialize(bool delay_overflow) { 133254721Semaste // define states 134254721Semaste guarantee((int)number_of_states <= (int)state_limit, "adjust number_of_state_bits"); 135254721Semaste def(wait_for_nothing, 0, do_nothing); 136254721Semaste if (delay_overflow) { 137254721Semaste def(wait_for_compile, 0, do_decay); 138254721Semaste } else { 139254721Semaste def(wait_for_compile, 0, dummy_invocation_counter_overflow); 140254721Semaste } 141254721Semaste 142254721Semaste InterpreterInvocationLimit = CompileThreshold << number_of_noncount_bits; 143254721Semaste InterpreterProfileLimit = ((CompileThreshold * InterpreterProfilePercentage) / 100)<< number_of_noncount_bits; 144254721Semaste 145254721Semaste // When methodData is collected, the backward branch limit is compared against a 146254721Semaste // methodData counter, rather than an InvocationCounter. In the former case, we 147254721Semaste // don't need the shift by number_of_noncount_bits, but we do need to adjust 148254721Semaste // the factor by which we scale the threshold. 149254721Semaste if (ProfileInterpreter) { 150254721Semaste InterpreterBackwardBranchLimit = (CompileThreshold * (OnStackReplacePercentage - InterpreterProfilePercentage)) / 100; 151254721Semaste } else { 152254721Semaste InterpreterBackwardBranchLimit = ((CompileThreshold * OnStackReplacePercentage) / 100) << number_of_noncount_bits; 153254721Semaste } 154254721Semaste 155254721Semaste assert(0 <= InterpreterBackwardBranchLimit, 156254721Semaste "OSR threshold should be non-negative"); 157254721Semaste assert(0 <= InterpreterProfileLimit && 158254721Semaste InterpreterProfileLimit <= InterpreterInvocationLimit, 159254721Semaste "profile threshold should be less than the compilation threshold " 160254721Semaste "and non-negative"); 161254721Semaste} 162254721Semaste 163254721Semastevoid invocationCounter_init() { 164254721Semaste InvocationCounter::reinitialize(DelayCompilationDuringStartup); 165254721Semaste} 166254721Semaste