duke@435: /*
duke@435:  * Copyright 1997-2007 Sun Microsystems, Inc.  All Rights Reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
duke@435:  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435:  * CA 95054 USA or visit www.sun.com if you need additional information or
duke@435:  * have any questions.
duke@435:  *
duke@435:  */
duke@435: 
duke@435: #include "incls/_precompiled.incl"
duke@435: #include "incls/_interfaceSupport.cpp.incl"
duke@435: 
duke@435: 
duke@435: // Implementation of InterfaceSupport
duke@435: 
duke@435: #ifdef ASSERT
duke@435: 
duke@435: long InterfaceSupport::_number_of_calls       = 0;
duke@435: long InterfaceSupport::_scavenge_alot_counter = 1;
duke@435: long InterfaceSupport::_fullgc_alot_counter   = 1;
duke@435: long InterfaceSupport::_fullgc_alot_invocation = 0;
duke@435: 
duke@435: Histogram* RuntimeHistogram;
duke@435: 
duke@435: RuntimeHistogramElement::RuntimeHistogramElement(const char* elementName) {
duke@435:   static volatile jint RuntimeHistogram_lock = 0;
duke@435:   _name = elementName;
duke@435:   uintx count = 0;
duke@435: 
duke@435:   while (Atomic::cmpxchg(1, &RuntimeHistogram_lock, 0) != 0) {
duke@435:     while (OrderAccess::load_acquire(&RuntimeHistogram_lock) != 0) {
duke@435:       count +=1;
duke@435:       if ( (WarnOnStalledSpinLock > 0)
duke@435:         && (count % WarnOnStalledSpinLock == 0)) {
duke@435:         warning("RuntimeHistogram_lock seems to be stalled");
duke@435:       }
duke@435:     }
duke@435:   }
duke@435: 
duke@435:   if (RuntimeHistogram == NULL) {
duke@435:     RuntimeHistogram = new Histogram("VM Runtime Call Counts",200);
duke@435:   }
duke@435: 
duke@435:   RuntimeHistogram->add_element(this);
duke@435:   Atomic::dec(&RuntimeHistogram_lock);
duke@435: }
duke@435: 
duke@435: void InterfaceSupport::trace(const char* result_type, const char* header) {
duke@435:   tty->print_cr("%6d  %s", _number_of_calls, header);
duke@435: }
duke@435: 
duke@435: void InterfaceSupport::gc_alot() {
duke@435:   Thread *thread = Thread::current();
ysr@1241:   if (!thread->is_Java_thread()) return; // Avoid concurrent calls
duke@435:   // Check for new, not quite initialized thread. A thread in new mode cannot initiate a GC.
duke@435:   JavaThread *current_thread = (JavaThread *)thread;
duke@435:   if (current_thread->active_handles() == NULL) return;
duke@435: 
ysr@1241:   // Short-circuit any possible re-entrant gc-a-lot attempt
ysr@1241:   if (thread->skip_gcalot()) return;
ysr@1241: 
duke@435:   if (is_init_completed()) {
duke@435: 
duke@435:     if (++_fullgc_alot_invocation < FullGCALotStart) {
duke@435:       return;
duke@435:     }
duke@435: 
duke@435:     // Use this line if you want to block at a specific point,
duke@435:     // e.g. one number_of_calls/scavenge/gc before you got into problems
duke@435:     if (FullGCALot) _fullgc_alot_counter--;
duke@435: 
duke@435:     // Check if we should force a full gc
duke@435:     if (_fullgc_alot_counter == 0) {
duke@435:       // Release dummy so objects are forced to move
duke@435:       if (!Universe::release_fullgc_alot_dummy()) {
duke@435:         warning("FullGCALot: Unable to release more dummies at bottom of heap");
duke@435:       }
duke@435:       HandleMark hm(thread);
duke@435:       Universe::heap()->collect(GCCause::_full_gc_alot);
duke@435:       unsigned int invocations = Universe::heap()->total_full_collections();
duke@435:       // Compute new interval
duke@435:       if (FullGCALotInterval > 1) {
duke@435:         _fullgc_alot_counter = 1+(long)((double)FullGCALotInterval*os::random()/(max_jint+1.0));
duke@435:         if (PrintGCDetails && Verbose) {
duke@435:           tty->print_cr("Full gc no: %u\tInterval: %d", invocations,
duke@435:                         _fullgc_alot_counter);
duke@435:         }
duke@435:       } else {
duke@435:         _fullgc_alot_counter = 1;
duke@435:       }
duke@435:       // Print progress message
duke@435:       if (invocations % 100 == 0) {
duke@435:         if (PrintGCDetails && Verbose) tty->print_cr("Full gc no: %u", invocations);
duke@435:       }
duke@435:     } else {
duke@435:       if (ScavengeALot) _scavenge_alot_counter--;
duke@435:       // Check if we should force a scavenge
duke@435:       if (_scavenge_alot_counter == 0) {
duke@435:         HandleMark hm(thread);
duke@435:         Universe::heap()->collect(GCCause::_scavenge_alot);
duke@435:         unsigned int invocations = Universe::heap()->total_collections() - Universe::heap()->total_full_collections();
duke@435:         // Compute new interval
duke@435:         if (ScavengeALotInterval > 1) {
duke@435:           _scavenge_alot_counter = 1+(long)((double)ScavengeALotInterval*os::random()/(max_jint+1.0));
duke@435:           if (PrintGCDetails && Verbose) {
duke@435:             tty->print_cr("Scavenge no: %u\tInterval: %d", invocations,
duke@435:                           _scavenge_alot_counter);
duke@435:           }
duke@435:         } else {
duke@435:           _scavenge_alot_counter = 1;
duke@435:         }
duke@435:         // Print progress message
duke@435:         if (invocations % 1000 == 0) {
duke@435:           if (PrintGCDetails && Verbose) tty->print_cr("Scavenge no: %u", invocations);
duke@435:         }
duke@435:       }
duke@435:     }
duke@435:   }
duke@435: }
duke@435: 
duke@435: 
duke@435: vframe* vframe_array[50];
duke@435: int walk_stack_counter = 0;
duke@435: 
duke@435: void InterfaceSupport::walk_stack_from(vframe* start_vf) {
duke@435:   // walk
duke@435:   int i = 0;
duke@435:   for (vframe* f = start_vf; f; f = f->sender() ) {
duke@435:     if (i < 50) vframe_array[i++] = f;
duke@435:   }
duke@435: }
duke@435: 
duke@435: 
duke@435: void InterfaceSupport::walk_stack() {
duke@435:   JavaThread* thread = JavaThread::current();
duke@435:   walk_stack_counter++;
duke@435:   if (!thread->has_last_Java_frame()) return;
duke@435:   ResourceMark rm(thread);
duke@435:   RegisterMap reg_map(thread);
duke@435:   walk_stack_from(thread->last_java_vframe(&reg_map));
duke@435: }
duke@435: 
duke@435: 
duke@435: # ifdef ENABLE_ZAP_DEAD_LOCALS
duke@435: 
duke@435: static int zap_traversals = 0;
duke@435: 
duke@435: void InterfaceSupport::zap_dead_locals_old() {
duke@435:   JavaThread* thread = JavaThread::current();
duke@435:   if (zap_traversals == -1) // edit constant for debugging
duke@435:     warning("I am here");
duke@435:   int zap_frame_count = 0; // count frames to help debugging
duke@435:   for (StackFrameStream sfs(thread); !sfs.is_done(); sfs.next()) {
duke@435:     sfs.current()->zap_dead_locals(thread, sfs.register_map());
duke@435:     ++zap_frame_count;
duke@435:   }
duke@435:   ++zap_traversals;
duke@435: }
duke@435: 
duke@435: # endif
duke@435: 
duke@435: 
duke@435: int deoptimizeAllCounter = 0;
duke@435: int zombieAllCounter = 0;
duke@435: 
duke@435: 
duke@435: void InterfaceSupport::zombieAll() {
duke@435:   if (is_init_completed() && zombieAllCounter > ZombieALotInterval) {
duke@435:     zombieAllCounter = 0;
duke@435:     VM_ZombieAll op;
duke@435:     VMThread::execute(&op);
duke@435:   } else {
duke@435:     zombieAllCounter++;
duke@435:   }
duke@435: }
duke@435: 
duke@435: void InterfaceSupport::deoptimizeAll() {
duke@435:   if (is_init_completed() ) {
duke@435:     if (DeoptimizeALot && deoptimizeAllCounter > DeoptimizeALotInterval) {
duke@435:       deoptimizeAllCounter = 0;
duke@435:       VM_DeoptimizeAll op;
duke@435:       VMThread::execute(&op);
duke@435:     } else if (DeoptimizeRandom && (deoptimizeAllCounter & 0x1f) == (os::random() & 0x1f)) {
duke@435:       VM_DeoptimizeAll op;
duke@435:       VMThread::execute(&op);
duke@435:     }
duke@435:   }
duke@435:   deoptimizeAllCounter++;
duke@435: }
duke@435: 
duke@435: 
duke@435: void InterfaceSupport::stress_derived_pointers() {
duke@435: #ifdef COMPILER2
duke@435:   JavaThread *thread = JavaThread::current();
duke@435:   if (!is_init_completed()) return;
duke@435:   ResourceMark rm(thread);
duke@435:   bool found = false;
duke@435:   for (StackFrameStream sfs(thread); !sfs.is_done() && !found; sfs.next()) {
duke@435:     CodeBlob* cb = sfs.current()->cb();
duke@435:     if (cb != NULL && cb->oop_maps() ) {
duke@435:       // Find oopmap for current method
duke@435:       OopMap* map = cb->oop_map_for_return_address(sfs.current()->pc());
duke@435:       assert(map != NULL, "no oopmap found for pc");
duke@435:       found = map->has_derived_pointer();
duke@435:     }
duke@435:   }
duke@435:   if (found) {
duke@435:     // $$$ Not sure what to do here.
duke@435:     /*
duke@435:     Scavenge::invoke(0);
duke@435:     */
duke@435:   }
duke@435: #endif
duke@435: }
duke@435: 
duke@435: 
duke@435: void InterfaceSupport::verify_stack() {
duke@435:   JavaThread* thread = JavaThread::current();
duke@435:   ResourceMark rm(thread);
duke@435:   // disabled because it throws warnings that oop maps should only be accessed
duke@435:   // in VM thread or during debugging
duke@435: 
duke@435:   if (!thread->has_pending_exception()) {
duke@435:     // verification does not work if there are pending exceptions
duke@435:     StackFrameStream sfs(thread);
duke@435:     CodeBlob* cb = sfs.current()->cb();
duke@435:       // In case of exceptions we might not have a runtime_stub on
duke@435:       // top of stack, hence, all callee-saved registers are not going
duke@435:       // to be setup correctly, hence, we cannot do stack verify
duke@435:     if (cb != NULL && !(cb->is_runtime_stub() || cb->is_uncommon_trap_stub())) return;
duke@435: 
duke@435:     for (; !sfs.is_done(); sfs.next()) {
duke@435:       sfs.current()->verify(sfs.register_map());
duke@435:     }
duke@435:   }
duke@435: }
duke@435: 
duke@435: 
duke@435: void InterfaceSupport::verify_last_frame() {
duke@435:   JavaThread* thread = JavaThread::current();
duke@435:   ResourceMark rm(thread);
duke@435:   RegisterMap reg_map(thread);
duke@435:   frame fr = thread->last_frame();
duke@435:   fr.verify(&reg_map);
duke@435: }
duke@435: 
duke@435: 
duke@435: #endif // ASSERT
duke@435: 
duke@435: 
duke@435: void InterfaceSupport_init() {
duke@435: #ifdef ASSERT
duke@435:   if (ScavengeALot || FullGCALot) {
duke@435:     srand(ScavengeALotInterval * FullGCALotInterval);
duke@435:   }
duke@435: #endif
duke@435: }