jdk8-mips64-public/hotspot: src/share/vm/runtime/simpleThresholdPolicy.cpp@f47fa50d9b9c (annotated)

src/share/vm/runtime/simpleThresholdPolicy.cpp@f47fa50d9b9c (annotated)

src/share/vm/runtime/simpleThresholdPolicy.cpp

Fri, 28 Mar 2014 10:12:48 -0700

author: vlivanov
date: Fri, 28 Mar 2014 10:12:48 -0700
changeset 6527: f47fa50d9b9c
parent 5036: 487d442ef257
child 6649: 7150b16fda52
permissions: -rw-r--r--

8035887: VM crashes trying to force inlining the recursive call
Reviewed-by: kvn, twisti

 /*
  * Copyright (c) 2010, 2013, 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 "compiler/compileBroker.hpp"
 #include "memory/resourceArea.hpp"
 #include "runtime/arguments.hpp"
 #include "runtime/simpleThresholdPolicy.hpp"
 #include "runtime/simpleThresholdPolicy.inline.hpp"
 #include "code/scopeDesc.hpp"
 void SimpleThresholdPolicy::print_counters(const char* prefix, methodHandle mh) {
   int invocation_count = mh->invocation_count();
   int backedge_count = mh->backedge_count();
   MethodData* mdh = mh->method_data();
   int mdo_invocations = 0, mdo_backedges = 0;
   int mdo_invocations_start = 0, mdo_backedges_start = 0;
   if (mdh != NULL) {
     mdo_invocations = mdh->invocation_count();
     mdo_backedges = mdh->backedge_count();
     mdo_invocations_start = mdh->invocation_count_start();
     mdo_backedges_start = mdh->backedge_count_start();
   }
   tty->print(" %stotal=%d,%d %smdo=%d(%d),%d(%d)", prefix,
       invocation_count, backedge_count, prefix,
       mdo_invocations, mdo_invocations_start,
       mdo_backedges, mdo_backedges_start);
   tty->print(" %smax levels=%d,%d", prefix,
       mh->highest_comp_level(), mh->highest_osr_comp_level());
 }
 // Print an event.
 void SimpleThresholdPolicy::print_event(EventType type, methodHandle mh, methodHandle imh,
                                         int bci, CompLevel level) {
   bool inlinee_event = mh() != imh();
   ttyLocker tty_lock;
   tty->print("%lf: [", os::elapsedTime());
   switch(type) {
   case CALL:
     tty->print("call");
     break;
   case LOOP:
     tty->print("loop");
     break;
   case COMPILE:
     tty->print("compile");
     break;
   case REMOVE_FROM_QUEUE:
     tty->print("remove-from-queue");
     break;
   case UPDATE_IN_QUEUE:
     tty->print("update-in-queue");
     break;
   case REPROFILE:
     tty->print("reprofile");
     break;
   case MAKE_NOT_ENTRANT:
     tty->print("make-not-entrant");
     break;
   default:
     tty->print("unknown");
   }
   tty->print(" level=%d ", level);
   ResourceMark rm;
   char *method_name = mh->name_and_sig_as_C_string();
   tty->print("[%s", method_name);
   if (inlinee_event) {
     char *inlinee_name = imh->name_and_sig_as_C_string();
     tty->print(" [%s]] ", inlinee_name);
   }
   else tty->print("] ");
   tty->print("@%d queues=%d,%d", bci, CompileBroker::queue_size(CompLevel_full_profile),
                                       CompileBroker::queue_size(CompLevel_full_optimization));
   print_specific(type, mh, imh, bci, level);
   if (type != COMPILE) {
     print_counters("", mh);
     if (inlinee_event) {
       print_counters("inlinee ", imh);
     }
     tty->print(" compilable=");
     bool need_comma = false;
     if (!mh->is_not_compilable(CompLevel_full_profile)) {
       tty->print("c1");
       need_comma = true;
     }
     if (!mh->is_not_osr_compilable(CompLevel_full_profile)) {
       if (need_comma) tty->print(",");
       tty->print("c1-osr");
       need_comma = true;
     }
     if (!mh->is_not_compilable(CompLevel_full_optimization)) {
       if (need_comma) tty->print(",");
       tty->print("c2");
       need_comma = true;
     }
     if (!mh->is_not_osr_compilable(CompLevel_full_optimization)) {
       if (need_comma) tty->print(",");
       tty->print("c2-osr");
     }
     tty->print(" status=");
     if (mh->queued_for_compilation()) {
       tty->print("in-queue");
     } else tty->print("idle");
   }
   tty->print_cr("]");
 }
 void SimpleThresholdPolicy::initialize() {
   if (FLAG_IS_DEFAULT(CICompilerCount)) {
     FLAG_SET_DEFAULT(CICompilerCount, 3);
   }
   int count = CICompilerCount;
   if (CICompilerCountPerCPU) {
     count = MAX2(log2_intptr(os::active_processor_count()), 1) * 3 / 2;
   }
   set_c1_count(MAX2(count / 3, 1));
   set_c2_count(MAX2(count - count / 3, 1));
 }
 void SimpleThresholdPolicy::set_carry_if_necessary(InvocationCounter *counter) {
   if (!counter->carry() && counter->count() > InvocationCounter::count_limit / 2) {
     counter->set_carry_flag();
   }
 }
 // Set carry flags on the counters if necessary
 void SimpleThresholdPolicy::handle_counter_overflow(Method* method) {
   MethodCounters *mcs = method->method_counters();
   if (mcs != NULL) {
     set_carry_if_necessary(mcs->invocation_counter());
     set_carry_if_necessary(mcs->backedge_counter());
   }
   MethodData* mdo = method->method_data();
   if (mdo != NULL) {
     set_carry_if_necessary(mdo->invocation_counter());
     set_carry_if_necessary(mdo->backedge_counter());
   }
 }
 // Called with the queue locked and with at least one element
 CompileTask* SimpleThresholdPolicy::select_task(CompileQueue* compile_queue) {
   return compile_queue->first();
 }
 void SimpleThresholdPolicy::reprofile(ScopeDesc* trap_scope, bool is_osr) {
   for (ScopeDesc* sd = trap_scope;; sd = sd->sender()) {
     if (PrintTieredEvents) {
       methodHandle mh(sd->method());
       print_event(REPROFILE, mh, mh, InvocationEntryBci, CompLevel_none);
     }
     MethodData* mdo = sd->method()->method_data();
     if (mdo != NULL) {
       mdo->reset_start_counters();
     }
     if (sd->is_top()) break;
   }
 }
 nmethod* SimpleThresholdPolicy::event(methodHandle method, methodHandle inlinee,
                                       int branch_bci, int bci, CompLevel comp_level, nmethod* nm, JavaThread* thread) {
   if (comp_level == CompLevel_none &&
       JvmtiExport::can_post_interpreter_events() &&
       thread->is_interp_only_mode()) {
     return NULL;
   }
   nmethod *osr_nm = NULL;
   handle_counter_overflow(method());
   if (method() != inlinee()) {
     handle_counter_overflow(inlinee());
   }
   if (PrintTieredEvents) {
     print_event(bci == InvocationEntryBci ? CALL : LOOP, method, inlinee, bci, comp_level);
   }
   if (bci == InvocationEntryBci) {
     method_invocation_event(method, inlinee, comp_level, nm, thread);
   } else {
     method_back_branch_event(method, inlinee, bci, comp_level, nm, thread);
     // method == inlinee if the event originated in the main method
     int highest_level = inlinee->highest_osr_comp_level();
     if (highest_level > comp_level) {
       osr_nm = inlinee->lookup_osr_nmethod_for(bci, highest_level, false);
     }
   }
   return osr_nm;
 }
 // Check if the method can be compiled, change level if necessary
 void SimpleThresholdPolicy::compile(methodHandle mh, int bci, CompLevel level, JavaThread* thread) {
   assert(level <= TieredStopAtLevel, "Invalid compilation level");
   if (level == CompLevel_none) {
     return;
   }
   // Check if the method can be compiled. If it cannot be compiled with C1, continue profiling
   // in the interpreter and then compile with C2 (the transition function will request that,
   // see common() ). If the method cannot be compiled with C2 but still can with C1, compile it with
   // pure C1.
   if (!can_be_compiled(mh, level)) {
     if (level == CompLevel_full_optimization && can_be_compiled(mh, CompLevel_simple)) {
         compile(mh, bci, CompLevel_simple, thread);
     }
     return;
   }
   if (bci != InvocationEntryBci && mh->is_not_osr_compilable(level)) {
     return;
   }
   if (!CompileBroker::compilation_is_in_queue(mh, bci)) {
     if (PrintTieredEvents) {
       print_event(COMPILE, mh, mh, bci, level);
     }
     submit_compile(mh, bci, level, thread);
   }
 }
 // Tell the broker to compile the method
 void SimpleThresholdPolicy::submit_compile(methodHandle mh, int bci, CompLevel level, JavaThread* thread) {
   int hot_count = (bci == InvocationEntryBci) ? mh->invocation_count() : mh->backedge_count();
   CompileBroker::compile_method(mh, bci, level, mh, hot_count, "tiered", thread);
 }
 // Call and loop predicates determine whether a transition to a higher
 // compilation level should be performed (pointers to predicate functions
 // are passed to common() transition function).
 bool SimpleThresholdPolicy::loop_predicate(int i, int b, CompLevel cur_level) {
   switch(cur_level) {
   case CompLevel_none:
   case CompLevel_limited_profile: {
     return loop_predicate_helper<CompLevel_none>(i, b, 1.0);
   }
   case CompLevel_full_profile: {
     return loop_predicate_helper<CompLevel_full_profile>(i, b, 1.0);
   }
   default:
     return true;
   }
 }
 bool SimpleThresholdPolicy::call_predicate(int i, int b, CompLevel cur_level) {
   switch(cur_level) {
   case CompLevel_none:
   case CompLevel_limited_profile: {
     return call_predicate_helper<CompLevel_none>(i, b, 1.0);
   }
   case CompLevel_full_profile: {
     return call_predicate_helper<CompLevel_full_profile>(i, b, 1.0);
   }
   default:
     return true;
   }
 }
 // Determine is a method is mature.
 bool SimpleThresholdPolicy::is_mature(Method* method) {
   if (is_trivial(method)) return true;
   MethodData* mdo = method->method_data();
   if (mdo != NULL) {
     int i = mdo->invocation_count();
     int b = mdo->backedge_count();
     double k = ProfileMaturityPercentage / 100.0;
     return call_predicate_helper<CompLevel_full_profile>(i, b, k) ||
            loop_predicate_helper<CompLevel_full_profile>(i, b, k);
   }
   return false;
 }
 // Common transition function. Given a predicate determines if a method should transition to another level.
 CompLevel SimpleThresholdPolicy::common(Predicate p, Method* method, CompLevel cur_level) {
   CompLevel next_level = cur_level;
   int i = method->invocation_count();
   int b = method->backedge_count();
   if (is_trivial(method)) {
     next_level = CompLevel_simple;
   } else {
     switch(cur_level) {
     case CompLevel_none:
       // If we were at full profile level, would we switch to full opt?
       if (common(p, method, CompLevel_full_profile) == CompLevel_full_optimization) {
         next_level = CompLevel_full_optimization;
       } else if ((this->*p)(i, b, cur_level)) {
         next_level = CompLevel_full_profile;
       }
       break;
     case CompLevel_limited_profile:
     case CompLevel_full_profile:
       {
         MethodData* mdo = method->method_data();
         if (mdo != NULL) {
           if (mdo->would_profile()) {
             int mdo_i = mdo->invocation_count_delta();
             int mdo_b = mdo->backedge_count_delta();
             if ((this->*p)(mdo_i, mdo_b, cur_level)) {
               next_level = CompLevel_full_optimization;
             }
           } else {
             next_level = CompLevel_full_optimization;
           }
         }
       }
       break;
     }
   }
   return MIN2(next_level, (CompLevel)TieredStopAtLevel);
 }
 // Determine if a method should be compiled with a normal entry point at a different level.
 CompLevel SimpleThresholdPolicy::call_event(Method* method,  CompLevel cur_level) {
   CompLevel osr_level = MIN2((CompLevel) method->highest_osr_comp_level(),
                              common(&SimpleThresholdPolicy::loop_predicate, method, cur_level));
   CompLevel next_level = common(&SimpleThresholdPolicy::call_predicate, method, cur_level);
   // If OSR method level is greater than the regular method level, the levels should be
   // equalized by raising the regular method level in order to avoid OSRs during each
   // invocation of the method.
   if (osr_level == CompLevel_full_optimization && cur_level == CompLevel_full_profile) {
     MethodData* mdo = method->method_data();
     guarantee(mdo != NULL, "MDO should not be NULL");
     if (mdo->invocation_count() >= 1) {
       next_level = CompLevel_full_optimization;
     }
   } else {
     next_level = MAX2(osr_level, next_level);
   }
   return next_level;
 }
 // Determine if we should do an OSR compilation of a given method.
 CompLevel SimpleThresholdPolicy::loop_event(Method* method, CompLevel cur_level) {
   CompLevel next_level = common(&SimpleThresholdPolicy::loop_predicate, method, cur_level);
   if (cur_level == CompLevel_none) {
     // If there is a live OSR method that means that we deopted to the interpreter
     // for the transition.
     CompLevel osr_level = MIN2((CompLevel)method->highest_osr_comp_level(), next_level);
     if (osr_level > CompLevel_none) {
       return osr_level;
     }
   }
   return next_level;
 }
 // Handle the invocation event.
 void SimpleThresholdPolicy::method_invocation_event(methodHandle mh, methodHandle imh,
                                               CompLevel level, nmethod* nm, JavaThread* thread) {
   if (is_compilation_enabled() && !CompileBroker::compilation_is_in_queue(mh, InvocationEntryBci)) {
     CompLevel next_level = call_event(mh(), level);
     if (next_level != level) {
       compile(mh, InvocationEntryBci, next_level, thread);
     }
   }
 }
 // Handle the back branch event. Notice that we can compile the method
 // with a regular entry from here.
 void SimpleThresholdPolicy::method_back_branch_event(methodHandle mh, methodHandle imh,
                                                      int bci, CompLevel level, nmethod* nm, JavaThread* thread) {
   // If the method is already compiling, quickly bail out.
   if (is_compilation_enabled() && !CompileBroker::compilation_is_in_queue(mh, bci)) {
     // Use loop event as an opportinity to also check there's been
     // enough calls.
     CompLevel cur_level = comp_level(mh());
     CompLevel next_level = call_event(mh(), cur_level);
     CompLevel next_osr_level = loop_event(mh(), level);
     next_level = MAX2(next_level,
                       next_osr_level < CompLevel_full_optimization ? next_osr_level : cur_level);
     bool is_compiling = false;
     if (next_level != cur_level) {
       compile(mh, InvocationEntryBci, next_level, thread);
       is_compiling = true;
     }
     // Do the OSR version
     if (!is_compiling && next_osr_level != level) {
       compile(mh, bci, next_osr_level, thread);
     }
   }
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/runtime/simpleThresholdPolicy.cpp@f47fa50d9b9c (annotated)

src/share/vm/runtime/simpleThresholdPolicy.cpp