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 /*

  * Copyright (c) 2005, 2012, 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_interface/collectedHeap.hpp"

 #include "memory/gcLocker.inline.hpp"

 #include "memory/universe.hpp"

 #include "oops/oop.inline.hpp"

 #include "runtime/thread.hpp"

 #include "runtime/unhandledOops.hpp"

 #include "utilities/globalDefinitions.hpp"

 #ifdef CHECK_UNHANDLED_OOPS

 const int free_list_size = 256;

 UnhandledOops::UnhandledOops(Thread* thread) {

   _thread = thread;

   _oop_list = new (ResourceObj::C_HEAP, mtInternal)

                     GrowableArray<UnhandledOopEntry>(free_list_size, true);

   _level = 0;

 }

 UnhandledOops::~UnhandledOops() {

   delete _oop_list;

 }

 void UnhandledOops::dump_oops(UnhandledOops *list) {

   for (int k = 0; k < list->_oop_list->length(); k++) {

     UnhandledOopEntry entry = list->_oop_list->at(k);

     tty->print(" " INTPTR_FORMAT, entry._oop_ptr);

   }

   tty->cr();

 }

 // For debugging unhandled oop detector _in the debugger_

 // You don't want to turn it on in compiled code here.

 static bool unhandled_oop_print=0;

 void UnhandledOops::register_unhandled_oop(oop* op, address pc) {

   if (!_thread->is_in_stack((address)op))

     return;

   _level ++;

   if (unhandled_oop_print) {

     for (int i=0; i<_level; i++) tty->print(" ");

     tty->print_cr("r " INTPTR_FORMAT, op);

   }

   UnhandledOopEntry entry(op, pc);

   _oop_list->push(entry);

 }

 bool match_oop_entry(void *op, UnhandledOopEntry e) {

   return (e.oop_ptr() == op);

 }

 // Mark unhandled oop as okay for GC - the containing struct has an oops_do and

 // for some reason the oop has to be on the stack.

 // May not be called for the current thread, as in the case of

 // VM_GetOrSetLocal in jvmti.

 void UnhandledOops::allow_unhandled_oop(oop* op) {

   assert (CheckUnhandledOops, "should only be called with checking option");

   int i = _oop_list->find_from_end(op, match_oop_entry);

   assert(i!=-1, "safe for gc oop not in unhandled_oop_list");

   UnhandledOopEntry entry = _oop_list->at(i);

   assert(!entry._ok_for_gc, "duplicate entry");

   entry._ok_for_gc = true;

   _oop_list->at_put(i, entry);

 }

 // Called by the oop destructor to remove unhandled oop from the thread's

 // oop list.  All oops given are assumed to be on the list.  If not,

 // there's a bug in the unhandled oop detector.

 void UnhandledOops::unregister_unhandled_oop(oop* op) {

   if (!_thread->is_in_stack((address)op)) return;

   _level --;

   if (unhandled_oop_print) {

     for (int i=0; i<_level; i++) tty->print(" ");

     tty->print_cr("u "INTPTR_FORMAT, op);

   }

   int i = _oop_list->find_from_end(op, match_oop_entry);

   assert(i!=-1, "oop not in unhandled_oop_list");

   _oop_list->remove_at(i);

 }

 void UnhandledOops::clear_unhandled_oops() {

   assert (CheckUnhandledOops, "should only be called with checking option");

   if (_thread->is_gc_locked_out()) {

     return;

   }

   for (int k = 0; k < _oop_list->length(); k++) {

     UnhandledOopEntry entry = _oop_list->at(k);

     // If an entry is on the unhandled oop list but isn't on the stack

     // anymore, it must not have gotten unregistered properly and it's a bug

     // in the unhandled oop generator.

     if(!_thread->is_in_stack((address)entry._oop_ptr)) {

       tty->print_cr("oop_ptr is " INTPTR_FORMAT, (address)entry._oop_ptr);

       tty->print_cr("thread is " INTPTR_FORMAT " from pc " INTPTR_FORMAT,

                      (address)_thread, (address)entry._pc);

       assert(false, "heap is corrupted by the unhandled oop detector");

     }

     // Set unhandled oops to a pattern that will crash distinctively

     if (!entry._ok_for_gc) *(intptr_t*)(entry._oop_ptr) = BAD_OOP_ADDR;

   }

 }

 #endif // CHECK_UNHANDLED_OOPS