diff -r 000000000000 -r a61af66fc99e src/share/vm/runtime/interfaceSupport.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/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(&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::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
+}