--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/runtime/interfaceSupport.cpp Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,269 @@
+/*
+ * Copyright 1997-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+#include "incls/_precompiled.incl"
+#include "incls/_interfaceSupport.cpp.incl"
+
+
+// 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_VM_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;
+
+ 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(®_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::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(®_map);
+}
+
+
+#endif // ASSERT
+
+
+void InterfaceSupport_init() {
+#ifdef ASSERT
+ if (ScavengeALot || FullGCALot) {
+ srand(ScavengeALotInterval * FullGCALotInterval);
+ }
+#endif
+}