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 /*

  * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  *

  */

 #include "precompiled.hpp"

 #include "interpreter/invocationCounter.hpp"

 #include "runtime/frame.hpp"

 #include "runtime/handles.inline.hpp"

 // Implementation of InvocationCounter

 void InvocationCounter::init() {

   _counter = 0;  // reset all the bits, including the sticky carry

   reset();

 }

 void InvocationCounter::reset() {

   // Only reset the state and don't make the method look like it's never

   // been executed

   set_state(wait_for_compile);

 }

 void InvocationCounter::set_carry() {

   set_carry_flag();

   // The carry bit now indicates that this counter had achieved a very

   // large value.  Now reduce the value, so that the method can be

   // executed many more times before re-entering the VM.

   int old_count = count();

   int new_count = MIN2(old_count, (int) (CompileThreshold / 2));

   // prevent from going to zero, to distinguish from never-executed methods

   if (new_count == 0)  new_count = 1;

   if (old_count != new_count)  set(state(), new_count);

 }

 void InvocationCounter::set_state(State state) {

   assert(0 <= state && state < number_of_states, "illegal state");

   int init = _init[state];

   // prevent from going to zero, to distinguish from never-executed methods

   if (init == 0 && count() > 0)  init = 1;

   int carry = (_counter & carry_mask);    // the carry bit is sticky

   _counter = (init << number_of_noncount_bits) | carry | state;

 }

 void InvocationCounter::print() {

   tty->print_cr("invocation count: up = %d, limit = %d, carry = %s, state = %s",

                                    count(), limit(),

                                    carry() ? "true" : "false",

                                    state_as_string(state()));

 }

 void InvocationCounter::print_short() {

   tty->print(" [%d%s;%s]", count(), carry()?"+carry":"", state_as_short_string(state()));

 }

 // Initialization

 int                       InvocationCounter::_init  [InvocationCounter::number_of_states];

 InvocationCounter::Action InvocationCounter::_action[InvocationCounter::number_of_states];

 int                       InvocationCounter::InterpreterInvocationLimit;

 int                       InvocationCounter::InterpreterBackwardBranchLimit;

 int                       InvocationCounter::InterpreterProfileLimit;

 const char* InvocationCounter::state_as_string(State state) {

   switch (state) {

     case wait_for_nothing            : return "wait_for_nothing";

     case wait_for_compile            : return "wait_for_compile";

   }

   ShouldNotReachHere();

   return NULL;

 }

 const char* InvocationCounter::state_as_short_string(State state) {

   switch (state) {

     case wait_for_nothing            : return "not comp.";

     case wait_for_compile            : return "compileable";

   }

   ShouldNotReachHere();

   return NULL;

 }

 static address do_nothing(methodHandle method, TRAPS) {

   // dummy action for inactive invocation counters

   method->invocation_counter()->set_carry();

   method->invocation_counter()->set_state(InvocationCounter::wait_for_nothing);

   return NULL;

 }

 static address do_decay(methodHandle method, TRAPS) {

   // decay invocation counters so compilation gets delayed

   method->invocation_counter()->decay();

   return NULL;

 }

 void InvocationCounter::def(State state, int init, Action action) {

   assert(0 <= state && state < number_of_states, "illegal state");

   assert(0 <= init  && init  < count_limit, "initial value out of range");

   _init  [state] = init;

   _action[state] = action;

 }

 address dummy_invocation_counter_overflow(methodHandle m, TRAPS) {

   ShouldNotReachHere();

   return NULL;

 }

 void InvocationCounter::reinitialize(bool delay_overflow) {

   // define states

   guarantee((int)number_of_states <= (int)state_limit, "adjust number_of_state_bits");

   def(wait_for_nothing, 0, do_nothing);

   if (delay_overflow) {

     def(wait_for_compile, 0, do_decay);

   } else {

     def(wait_for_compile, 0, dummy_invocation_counter_overflow);

   }

   InterpreterInvocationLimit = CompileThreshold << number_of_noncount_bits;

   InterpreterProfileLimit = ((CompileThreshold * InterpreterProfilePercentage) / 100)<< number_of_noncount_bits;

   // When methodData is collected, the backward branch limit is compared against a

   // methodData counter, rather than an InvocationCounter.  In the former case, we

   // don't need the shift by number_of_noncount_bits, but we do need to adjust

   // the factor by which we scale the threshold.

   if (ProfileInterpreter) {

     InterpreterBackwardBranchLimit = (CompileThreshold * (OnStackReplacePercentage - InterpreterProfilePercentage)) / 100;

   } else {

     InterpreterBackwardBranchLimit = ((CompileThreshold * OnStackReplacePercentage) / 100) << number_of_noncount_bits;

   }

   assert(0 <= InterpreterBackwardBranchLimit,

          "OSR threshold should be non-negative");

   assert(0 <= InterpreterProfileLimit &&

          InterpreterProfileLimit <= InterpreterInvocationLimit,

          "profile threshold should be less than the compilation threshold "

          "and non-negative");

 }

 void invocationCounter_init() {

   InvocationCounter::reinitialize(DelayCompilationDuringStartup);

 }