aoqi@0: /*
aoqi@0:  * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  *
aoqi@0:  */
aoqi@0: 
aoqi@0: #include "precompiled.hpp"
aoqi@0: #include "gc_implementation/shared/markSweep.hpp"
aoqi@0: #include "gc_interface/collectedHeap.hpp"
aoqi@0: #include "gc_interface/collectedHeap.inline.hpp"
aoqi@0: #include "memory/genCollectedHeap.hpp"
aoqi@0: #include "memory/resourceArea.hpp"
aoqi@0: #include "runtime/init.hpp"
aoqi@0: #include "runtime/interfaceSupport.hpp"
goetz@6911: #include "runtime/orderAccess.inline.hpp"
aoqi@0: #include "runtime/threadLocalStorage.hpp"
aoqi@0: #include "runtime/vframe.hpp"
aoqi@0: #include "utilities/preserveException.hpp"
aoqi@0: 
aoqi@0: PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
aoqi@0: 
aoqi@0: // Implementation of InterfaceSupport
aoqi@0: 
aoqi@0: #ifdef ASSERT
aoqi@0: 
aoqi@0: long InterfaceSupport::_number_of_calls       = 0;
aoqi@0: long InterfaceSupport::_scavenge_alot_counter = 1;
aoqi@0: long InterfaceSupport::_fullgc_alot_counter   = 1;
aoqi@0: long InterfaceSupport::_fullgc_alot_invocation = 0;
aoqi@0: 
aoqi@0: Histogram* RuntimeHistogram;
aoqi@0: 
aoqi@0: RuntimeHistogramElement::RuntimeHistogramElement(const char* elementName) {
aoqi@0:   static volatile jint RuntimeHistogram_lock = 0;
aoqi@0:   _name = elementName;
aoqi@0:   uintx count = 0;
aoqi@0: 
aoqi@0:   while (Atomic::cmpxchg(1, &RuntimeHistogram_lock, 0) != 0) {
aoqi@0:     while (OrderAccess::load_acquire(&RuntimeHistogram_lock) != 0) {
aoqi@0:       count +=1;
aoqi@0:       if ( (WarnOnStalledSpinLock > 0)
aoqi@0:         && (count % WarnOnStalledSpinLock == 0)) {
aoqi@0:         warning("RuntimeHistogram_lock seems to be stalled");
aoqi@0:       }
aoqi@0:     }
aoqi@0:   }
aoqi@0: 
aoqi@0:   if (RuntimeHistogram == NULL) {
aoqi@0:     RuntimeHistogram = new Histogram("VM Runtime Call Counts",200);
aoqi@0:   }
aoqi@0: 
aoqi@0:   RuntimeHistogram->add_element(this);
aoqi@0:   Atomic::dec(&RuntimeHistogram_lock);
aoqi@0: }
aoqi@0: 
aoqi@0: void InterfaceSupport::trace(const char* result_type, const char* header) {
aoqi@0:   tty->print_cr("%6d  %s", _number_of_calls, header);
aoqi@0: }
aoqi@0: 
aoqi@0: void InterfaceSupport::gc_alot() {
aoqi@0:   Thread *thread = Thread::current();
aoqi@0:   if (!thread->is_Java_thread()) return; // Avoid concurrent calls
aoqi@0:   // Check for new, not quite initialized thread. A thread in new mode cannot initiate a GC.
aoqi@0:   JavaThread *current_thread = (JavaThread *)thread;
aoqi@0:   if (current_thread->active_handles() == NULL) return;
aoqi@0: 
aoqi@0:   // Short-circuit any possible re-entrant gc-a-lot attempt
aoqi@0:   if (thread->skip_gcalot()) return;
aoqi@0: 
kbarrett@7360:   if (Threads::is_vm_complete()) {
aoqi@0: 
aoqi@0:     if (++_fullgc_alot_invocation < FullGCALotStart) {
aoqi@0:       return;
aoqi@0:     }
aoqi@0: 
aoqi@0:     // Use this line if you want to block at a specific point,
aoqi@0:     // e.g. one number_of_calls/scavenge/gc before you got into problems
aoqi@0:     if (FullGCALot) _fullgc_alot_counter--;
aoqi@0: 
aoqi@0:     // Check if we should force a full gc
aoqi@0:     if (_fullgc_alot_counter == 0) {
aoqi@0:       // Release dummy so objects are forced to move
aoqi@0:       if (!Universe::release_fullgc_alot_dummy()) {
aoqi@0:         warning("FullGCALot: Unable to release more dummies at bottom of heap");
aoqi@0:       }
aoqi@0:       HandleMark hm(thread);
aoqi@0:       Universe::heap()->collect(GCCause::_full_gc_alot);
aoqi@0:       unsigned int invocations = Universe::heap()->total_full_collections();
aoqi@0:       // Compute new interval
aoqi@0:       if (FullGCALotInterval > 1) {
aoqi@0:         _fullgc_alot_counter = 1+(long)((double)FullGCALotInterval*os::random()/(max_jint+1.0));
aoqi@0:         if (PrintGCDetails && Verbose) {
aoqi@0:           tty->print_cr("Full gc no: %u\tInterval: %d", invocations,
aoqi@0:                         _fullgc_alot_counter);
aoqi@0:         }
aoqi@0:       } else {
aoqi@0:         _fullgc_alot_counter = 1;
aoqi@0:       }
aoqi@0:       // Print progress message
aoqi@0:       if (invocations % 100 == 0) {
aoqi@0:         if (PrintGCDetails && Verbose) tty->print_cr("Full gc no: %u", invocations);
aoqi@0:       }
aoqi@0:     } else {
aoqi@0:       if (ScavengeALot) _scavenge_alot_counter--;
aoqi@0:       // Check if we should force a scavenge
aoqi@0:       if (_scavenge_alot_counter == 0) {
aoqi@0:         HandleMark hm(thread);
aoqi@0:         Universe::heap()->collect(GCCause::_scavenge_alot);
aoqi@0:         unsigned int invocations = Universe::heap()->total_collections() - Universe::heap()->total_full_collections();
aoqi@0:         // Compute new interval
aoqi@0:         if (ScavengeALotInterval > 1) {
aoqi@0:           _scavenge_alot_counter = 1+(long)((double)ScavengeALotInterval*os::random()/(max_jint+1.0));
aoqi@0:           if (PrintGCDetails && Verbose) {
aoqi@0:             tty->print_cr("Scavenge no: %u\tInterval: %d", invocations,
aoqi@0:                           _scavenge_alot_counter);
aoqi@0:           }
aoqi@0:         } else {
aoqi@0:           _scavenge_alot_counter = 1;
aoqi@0:         }
aoqi@0:         // Print progress message
aoqi@0:         if (invocations % 1000 == 0) {
aoqi@0:           if (PrintGCDetails && Verbose) tty->print_cr("Scavenge no: %u", invocations);
aoqi@0:         }
aoqi@0:       }
aoqi@0:     }
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: 
aoqi@0: vframe* vframe_array[50];
aoqi@0: int walk_stack_counter = 0;
aoqi@0: 
aoqi@0: void InterfaceSupport::walk_stack_from(vframe* start_vf) {
aoqi@0:   // walk
aoqi@0:   int i = 0;
aoqi@0:   for (vframe* f = start_vf; f; f = f->sender() ) {
aoqi@0:     if (i < 50) vframe_array[i++] = f;
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: 
aoqi@0: void InterfaceSupport::walk_stack() {
aoqi@0:   JavaThread* thread = JavaThread::current();
aoqi@0:   walk_stack_counter++;
aoqi@0:   if (!thread->has_last_Java_frame()) return;
aoqi@0:   ResourceMark rm(thread);
aoqi@0:   RegisterMap reg_map(thread);
aoqi@0:   walk_stack_from(thread->last_java_vframe(&reg_map));
aoqi@0: }
aoqi@0: 
aoqi@0: 
aoqi@0: # ifdef ENABLE_ZAP_DEAD_LOCALS
aoqi@0: 
aoqi@0: static int zap_traversals = 0;
aoqi@0: 
aoqi@0: void InterfaceSupport::zap_dead_locals_old() {
aoqi@0:   JavaThread* thread = JavaThread::current();
aoqi@0:   if (zap_traversals == -1) // edit constant for debugging
aoqi@0:     warning("I am here");
aoqi@0:   int zap_frame_count = 0; // count frames to help debugging
aoqi@0:   for (StackFrameStream sfs(thread); !sfs.is_done(); sfs.next()) {
aoqi@0:     sfs.current()->zap_dead_locals(thread, sfs.register_map());
aoqi@0:     ++zap_frame_count;
aoqi@0:   }
aoqi@0:   ++zap_traversals;
aoqi@0: }
aoqi@0: 
aoqi@0: # endif
aoqi@0: 
iignatyev@7875: // invocation counter for InterfaceSupport::deoptimizeAll/zombieAll functions
aoqi@0: int deoptimizeAllCounter = 0;
aoqi@0: int zombieAllCounter = 0;
aoqi@0: 
aoqi@0: void InterfaceSupport::zombieAll() {
iignatyev@7875:   // This method is called by all threads when a thread make
iignatyev@7875:   // transition to VM state (for example, runtime calls).
iignatyev@7875:   // Divide number of calls by number of threads to avoid
iignatyev@7875:   // dependence of ZombieAll events frequency on number of threads.
iignatyev@7875:   int value = zombieAllCounter / Threads::number_of_threads();
iignatyev@7875:   if (is_init_completed() && value > ZombieALotInterval) {
aoqi@0:     zombieAllCounter = 0;
aoqi@0:     VM_ZombieAll op;
aoqi@0:     VMThread::execute(&op);
aoqi@0:   }
iignatyev@7875:   zombieAllCounter++;
aoqi@0: }
aoqi@0: 
aoqi@0: void InterfaceSupport::unlinkSymbols() {
aoqi@0:   VM_UnlinkSymbols op;
aoqi@0:   VMThread::execute(&op);
aoqi@0: }
aoqi@0: 
aoqi@0: void InterfaceSupport::deoptimizeAll() {
iignatyev@7875:   // This method is called by all threads when a thread make
iignatyev@7875:   // transition to VM state (for example, runtime calls).
iignatyev@7875:   // Divide number of calls by number of threads to avoid
iignatyev@7875:   // dependence of DeoptimizeAll events frequency on number of threads.
iignatyev@7875:   int value = deoptimizeAllCounter / Threads::number_of_threads();
iignatyev@7875:   if (is_init_completed()) {
iignatyev@7875:     if (DeoptimizeALot && value > DeoptimizeALotInterval) {
aoqi@0:       deoptimizeAllCounter = 0;
aoqi@0:       VM_DeoptimizeAll op;
aoqi@0:       VMThread::execute(&op);
iignatyev@7875:     } else if (DeoptimizeRandom && (value & 0x1F) == (os::random() & 0x1F)) {
aoqi@0:       VM_DeoptimizeAll op;
aoqi@0:       VMThread::execute(&op);
aoqi@0:     }
aoqi@0:   }
aoqi@0:   deoptimizeAllCounter++;
aoqi@0: }
aoqi@0: 
aoqi@0: 
aoqi@0: void InterfaceSupport::stress_derived_pointers() {
aoqi@0: #ifdef COMPILER2
aoqi@0:   JavaThread *thread = JavaThread::current();
aoqi@0:   if (!is_init_completed()) return;
aoqi@0:   ResourceMark rm(thread);
aoqi@0:   bool found = false;
aoqi@0:   for (StackFrameStream sfs(thread); !sfs.is_done() && !found; sfs.next()) {
aoqi@0:     CodeBlob* cb = sfs.current()->cb();
aoqi@0:     if (cb != NULL && cb->oop_maps() ) {
aoqi@0:       // Find oopmap for current method
aoqi@0:       OopMap* map = cb->oop_map_for_return_address(sfs.current()->pc());
aoqi@0:       assert(map != NULL, "no oopmap found for pc");
aoqi@0:       found = map->has_derived_pointer();
aoqi@0:     }
aoqi@0:   }
aoqi@0:   if (found) {
aoqi@0:     // $$$ Not sure what to do here.
aoqi@0:     /*
aoqi@0:     Scavenge::invoke(0);
aoqi@0:     */
aoqi@0:   }
aoqi@0: #endif
aoqi@0: }
aoqi@0: 
aoqi@0: 
aoqi@0: void InterfaceSupport::verify_stack() {
aoqi@0:   JavaThread* thread = JavaThread::current();
aoqi@0:   ResourceMark rm(thread);
aoqi@0:   // disabled because it throws warnings that oop maps should only be accessed
aoqi@0:   // in VM thread or during debugging
aoqi@0: 
aoqi@0:   if (!thread->has_pending_exception()) {
aoqi@0:     // verification does not work if there are pending exceptions
aoqi@0:     StackFrameStream sfs(thread);
aoqi@0:     CodeBlob* cb = sfs.current()->cb();
aoqi@0:       // In case of exceptions we might not have a runtime_stub on
aoqi@0:       // top of stack, hence, all callee-saved registers are not going
aoqi@0:       // to be setup correctly, hence, we cannot do stack verify
aoqi@0:     if (cb != NULL && !(cb->is_runtime_stub() || cb->is_uncommon_trap_stub())) return;
aoqi@0: 
aoqi@0:     for (; !sfs.is_done(); sfs.next()) {
aoqi@0:       sfs.current()->verify(sfs.register_map());
aoqi@0:     }
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: 
aoqi@0: void InterfaceSupport::verify_last_frame() {
aoqi@0:   JavaThread* thread = JavaThread::current();
aoqi@0:   ResourceMark rm(thread);
aoqi@0:   RegisterMap reg_map(thread);
aoqi@0:   frame fr = thread->last_frame();
aoqi@0:   fr.verify(&reg_map);
aoqi@0: }
aoqi@0: 
aoqi@0: 
aoqi@0: #endif // ASSERT
aoqi@0: 
aoqi@0: 
aoqi@0: void InterfaceSupport_init() {
aoqi@0: #ifdef ASSERT
aoqi@0:   if (ScavengeALot || FullGCALot) {
aoqi@0:     srand(ScavengeALotInterval * FullGCALotInterval);
aoqi@0:   }
aoqi@0: #endif
aoqi@0: }