aoqi@0: /*
aoqi@0:  * Copyright (c) 2005, 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_interface/collectedHeap.hpp"
aoqi@0: #include "memory/gcLocker.inline.hpp"
aoqi@0: #include "memory/universe.hpp"
aoqi@0: #include "oops/oop.inline.hpp"
aoqi@0: #include "runtime/thread.hpp"
aoqi@0: #include "runtime/unhandledOops.hpp"
aoqi@0: #include "utilities/globalDefinitions.hpp"
aoqi@0: 
aoqi@0: PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
aoqi@0: 
aoqi@0: #ifdef CHECK_UNHANDLED_OOPS
aoqi@0: const int free_list_size = 256;
aoqi@0: 
aoqi@0: 
aoqi@0: UnhandledOops::UnhandledOops(Thread* thread) {
aoqi@0:   _thread = thread;
aoqi@0:   _oop_list = new (ResourceObj::C_HEAP, mtInternal)
aoqi@0:                     GrowableArray<UnhandledOopEntry>(free_list_size, true);
aoqi@0:   _level = 0;
aoqi@0: }
aoqi@0: 
aoqi@0: UnhandledOops::~UnhandledOops() {
aoqi@0:   delete _oop_list;
aoqi@0: }
aoqi@0: 
aoqi@0: 
aoqi@0: void UnhandledOops::dump_oops(UnhandledOops *list) {
aoqi@0:   for (int k = 0; k < list->_oop_list->length(); k++) {
aoqi@0:     UnhandledOopEntry entry = list->_oop_list->at(k);
aoqi@0:     tty->print(" " INTPTR_FORMAT, entry._oop_ptr);
aoqi@0:   }
aoqi@0:   tty->cr();
aoqi@0: }
aoqi@0: 
aoqi@0: // For debugging unhandled oop detector _in the debugger_
aoqi@0: // You don't want to turn it on in compiled code here.
aoqi@0: static bool unhandled_oop_print=0;
aoqi@0: 
aoqi@0: void UnhandledOops::register_unhandled_oop(oop* op, address pc) {
aoqi@0:   if (!_thread->is_in_stack((address)op))
aoqi@0:     return;
aoqi@0: 
aoqi@0:   _level ++;
aoqi@0:   if (unhandled_oop_print) {
aoqi@0:     for (int i=0; i<_level; i++) tty->print(" ");
aoqi@0:     tty->print_cr("r " INTPTR_FORMAT, op);
aoqi@0:   }
aoqi@0:   UnhandledOopEntry entry(op, pc);
aoqi@0:   _oop_list->push(entry);
aoqi@0: }
aoqi@0: 
aoqi@0: 
aoqi@0: bool match_oop_entry(void *op, UnhandledOopEntry e) {
aoqi@0:   return (e.oop_ptr() == op);
aoqi@0: }
aoqi@0: 
aoqi@0: // Mark unhandled oop as okay for GC - the containing struct has an oops_do and
aoqi@0: // for some reason the oop has to be on the stack.
aoqi@0: // May not be called for the current thread, as in the case of
aoqi@0: // VM_GetOrSetLocal in jvmti.
aoqi@0: void UnhandledOops::allow_unhandled_oop(oop* op) {
aoqi@0:   assert (CheckUnhandledOops, "should only be called with checking option");
aoqi@0: 
aoqi@0:   int i = _oop_list->find_from_end(op, match_oop_entry);
aoqi@0:   assert(i!=-1, "safe for gc oop not in unhandled_oop_list");
aoqi@0: 
aoqi@0:   UnhandledOopEntry entry = _oop_list->at(i);
aoqi@0:   assert(!entry._ok_for_gc, "duplicate entry");
aoqi@0:   entry._ok_for_gc = true;
aoqi@0:   _oop_list->at_put(i, entry);
aoqi@0: }
aoqi@0: 
aoqi@0: 
aoqi@0: // Called by the oop destructor to remove unhandled oop from the thread's
aoqi@0: // oop list.  All oops given are assumed to be on the list.  If not,
aoqi@0: // there's a bug in the unhandled oop detector.
aoqi@0: void UnhandledOops::unregister_unhandled_oop(oop* op) {
aoqi@0:   if (!_thread->is_in_stack((address)op)) return;
aoqi@0: 
aoqi@0:   _level --;
aoqi@0:   if (unhandled_oop_print) {
aoqi@0:     for (int i=0; i<_level; i++) tty->print(" ");
aoqi@0:     tty->print_cr("u "INTPTR_FORMAT, op);
aoqi@0:   }
aoqi@0: 
aoqi@0:   int i = _oop_list->find_from_end(op, match_oop_entry);
aoqi@0:   assert(i!=-1, "oop not in unhandled_oop_list");
aoqi@0:   _oop_list->remove_at(i);
aoqi@0: }
aoqi@0: 
aoqi@0: void UnhandledOops::clear_unhandled_oops() {
aoqi@0:   assert (CheckUnhandledOops, "should only be called with checking option");
aoqi@0: 
aoqi@0:   for (int k = 0; k < _oop_list->length(); k++) {
aoqi@0:     UnhandledOopEntry entry = _oop_list->at(k);
aoqi@0:     // If an entry is on the unhandled oop list but isn't on the stack
aoqi@0:     // anymore, it must not have gotten unregistered properly and it's a bug
aoqi@0:     // in the unhandled oop generator.
aoqi@0:     if(!_thread->is_in_stack((address)entry._oop_ptr)) {
aoqi@0:       tty->print_cr("oop_ptr is " INTPTR_FORMAT, (address)entry._oop_ptr);
aoqi@0:       tty->print_cr("thread is " INTPTR_FORMAT " from pc " INTPTR_FORMAT,
aoqi@0:                      (address)_thread, (address)entry._pc);
aoqi@0:       assert(false, "heap is corrupted by the unhandled oop detector");
aoqi@0:     }
aoqi@0:     // Set unhandled oops to a pattern that will crash distinctively
aoqi@0:     if (!entry._ok_for_gc) *(intptr_t*)(entry._oop_ptr) = BAD_OOP_ADDR;
aoqi@0:   }
aoqi@0: }
aoqi@0: #endif // CHECK_UNHANDLED_OOPS