Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 1997, 2014, 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 "gc_implementation/shared/markSweep.hpp"

 #include "gc_interface/collectedHeap.hpp"

 #include "gc_interface/collectedHeap.inline.hpp"

 #include "memory/genCollectedHeap.hpp"

 #include "memory/resourceArea.hpp"

 #include "runtime/init.hpp"

 #include "runtime/interfaceSupport.hpp"

 #include "runtime/threadLocalStorage.hpp"

 #include "runtime/vframe.hpp"

 #include "utilities/preserveException.hpp"

 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC

 // Implementation of InterfaceSupport

 #ifdef ASSERT

 long InterfaceSupport::_number_of_calls       = 0;

 long InterfaceSupport::_scavenge_alot_counter = 1;

 long InterfaceSupport::_fullgc_alot_counter   = 1;

 long InterfaceSupport::_fullgc_alot_invocation = 0;

 Histogram* RuntimeHistogram;

 RuntimeHistogramElement::RuntimeHistogramElement(const char* elementName) {

   static volatile jint RuntimeHistogram_lock = 0;

   _name = elementName;

   uintx count = 0;

   while (Atomic::cmpxchg(1, &RuntimeHistogram_lock, 0) != 0) {

     while (OrderAccess::load_acquire(&RuntimeHistogram_lock) != 0) {

       count +=1;

       if ( (WarnOnStalledSpinLock > 0)

         && (count % WarnOnStalledSpinLock == 0)) {

         warning("RuntimeHistogram_lock seems to be stalled");

       }

     }

   }

   if (RuntimeHistogram == NULL) {

     RuntimeHistogram = new Histogram("VM Runtime Call Counts",200);

   }

   RuntimeHistogram->add_element(this);

   Atomic::dec(&RuntimeHistogram_lock);

 }

 void InterfaceSupport::trace(const char* result_type, const char* header) {

   tty->print_cr("%6d  %s", _number_of_calls, header);

 }

 void InterfaceSupport::gc_alot() {

   Thread *thread = Thread::current();

   if (!thread->is_Java_thread()) return; // Avoid concurrent calls

   // Check for new, not quite initialized thread. A thread in new mode cannot initiate a GC.

   JavaThread *current_thread = (JavaThread *)thread;

   if (current_thread->active_handles() == NULL) return;

   // Short-circuit any possible re-entrant gc-a-lot attempt

   if (thread->skip_gcalot()) return;

   if (is_init_completed()) {

     if (++_fullgc_alot_invocation < FullGCALotStart) {

       return;

     }

     // Use this line if you want to block at a specific point,

     // e.g. one number_of_calls/scavenge/gc before you got into problems

     if (FullGCALot) _fullgc_alot_counter--;

     // Check if we should force a full gc

     if (_fullgc_alot_counter == 0) {

       // Release dummy so objects are forced to move

       if (!Universe::release_fullgc_alot_dummy()) {

         warning("FullGCALot: Unable to release more dummies at bottom of heap");

       }

       HandleMark hm(thread);

       Universe::heap()->collect(GCCause::_full_gc_alot);

       unsigned int invocations = Universe::heap()->total_full_collections();

       // Compute new interval

       if (FullGCALotInterval > 1) {

         _fullgc_alot_counter = 1+(long)((double)FullGCALotInterval*os::random()/(max_jint+1.0));

         if (PrintGCDetails && Verbose) {

           tty->print_cr("Full gc no: %u\tInterval: %d", invocations,

                         _fullgc_alot_counter);

         }

       } else {

         _fullgc_alot_counter = 1;

       }

       // Print progress message

       if (invocations % 100 == 0) {

         if (PrintGCDetails && Verbose) tty->print_cr("Full gc no: %u", invocations);

       }

     } else {

       if (ScavengeALot) _scavenge_alot_counter--;

       // Check if we should force a scavenge

       if (_scavenge_alot_counter == 0) {

         HandleMark hm(thread);

         Universe::heap()->collect(GCCause::_scavenge_alot);

         unsigned int invocations = Universe::heap()->total_collections() - Universe::heap()->total_full_collections();

         // Compute new interval

         if (ScavengeALotInterval > 1) {

           _scavenge_alot_counter = 1+(long)((double)ScavengeALotInterval*os::random()/(max_jint+1.0));

           if (PrintGCDetails && Verbose) {

             tty->print_cr("Scavenge no: %u\tInterval: %d", invocations,

                           _scavenge_alot_counter);

           }

         } else {

           _scavenge_alot_counter = 1;

         }

         // Print progress message

         if (invocations % 1000 == 0) {

           if (PrintGCDetails && Verbose) tty->print_cr("Scavenge no: %u", invocations);

         }

       }

     }

   }

 }

 vframe* vframe_array[50];

 int walk_stack_counter = 0;

 void InterfaceSupport::walk_stack_from(vframe* start_vf) {

   // walk

   int i = 0;

   for (vframe* f = start_vf; f; f = f->sender() ) {

     if (i < 50) vframe_array[i++] = f;

   }

 }

 void InterfaceSupport::walk_stack() {

   JavaThread* thread = JavaThread::current();

   walk_stack_counter++;

   if (!thread->has_last_Java_frame()) return;

   ResourceMark rm(thread);

   RegisterMap reg_map(thread);

   walk_stack_from(thread->last_java_vframe(&reg_map));

 }

 # ifdef ENABLE_ZAP_DEAD_LOCALS

 static int zap_traversals = 0;

 void InterfaceSupport::zap_dead_locals_old() {

   JavaThread* thread = JavaThread::current();

   if (zap_traversals == -1) // edit constant for debugging

     warning("I am here");

   int zap_frame_count = 0; // count frames to help debugging

   for (StackFrameStream sfs(thread); !sfs.is_done(); sfs.next()) {

     sfs.current()->zap_dead_locals(thread, sfs.register_map());

     ++zap_frame_count;

   }

   ++zap_traversals;

 }

 # endif

 int deoptimizeAllCounter = 0;

 int zombieAllCounter = 0;

 void InterfaceSupport::zombieAll() {

   if (is_init_completed() && zombieAllCounter > ZombieALotInterval) {

     zombieAllCounter = 0;

     VM_ZombieAll op;

     VMThread::execute(&op);

   } else {

     zombieAllCounter++;

   }

 }

 void InterfaceSupport::unlinkSymbols() {

   VM_UnlinkSymbols op;

   VMThread::execute(&op);

 }

 void InterfaceSupport::deoptimizeAll() {

   if (is_init_completed() ) {

     if (DeoptimizeALot && deoptimizeAllCounter > DeoptimizeALotInterval) {

       deoptimizeAllCounter = 0;

       VM_DeoptimizeAll op;

       VMThread::execute(&op);

     } else if (DeoptimizeRandom && (deoptimizeAllCounter & 0x1f) == (os::random() & 0x1f)) {

       VM_DeoptimizeAll op;

       VMThread::execute(&op);

     }

   }

   deoptimizeAllCounter++;

 }

 void InterfaceSupport::stress_derived_pointers() {

 #ifdef COMPILER2

   JavaThread *thread = JavaThread::current();

   if (!is_init_completed()) return;

   ResourceMark rm(thread);

   bool found = false;

   for (StackFrameStream sfs(thread); !sfs.is_done() && !found; sfs.next()) {

     CodeBlob* cb = sfs.current()->cb();

     if (cb != NULL && cb->oop_maps() ) {

       // Find oopmap for current method

       OopMap* map = cb->oop_map_for_return_address(sfs.current()->pc());

       assert(map != NULL, "no oopmap found for pc");

       found = map->has_derived_pointer();

     }

   }

   if (found) {

     // $$$ Not sure what to do here.

     /*

     Scavenge::invoke(0);

     */

   }

 #endif

 }

 void InterfaceSupport::verify_stack() {

   JavaThread* thread = JavaThread::current();

   ResourceMark rm(thread);

   // disabled because it throws warnings that oop maps should only be accessed

   // in VM thread or during debugging

   if (!thread->has_pending_exception()) {

     // verification does not work if there are pending exceptions

     StackFrameStream sfs(thread);

     CodeBlob* cb = sfs.current()->cb();

       // In case of exceptions we might not have a runtime_stub on

       // top of stack, hence, all callee-saved registers are not going

       // to be setup correctly, hence, we cannot do stack verify

     if (cb != NULL && !(cb->is_runtime_stub() || cb->is_uncommon_trap_stub())) return;

     for (; !sfs.is_done(); sfs.next()) {

       sfs.current()->verify(sfs.register_map());

     }

   }

 }

 void InterfaceSupport::verify_last_frame() {

   JavaThread* thread = JavaThread::current();

   ResourceMark rm(thread);

   RegisterMap reg_map(thread);

   frame fr = thread->last_frame();

   fr.verify(&reg_map);

 }

 #endif // ASSERT

 void InterfaceSupport_init() {

 #ifdef ASSERT

   if (ScavengeALot || FullGCALot) {

     srand(ScavengeALotInterval * FullGCALotInterval);

   }

 #endif

 }