| /* |
| * Copyright (c) 2005, 2015, 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/shared/collectedHeap.hpp" |
| #include "gc/shared/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, p2i(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, p2i(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, p2i(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"); |
| |
| 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, p2i(entry._oop_ptr)); |
| tty->print_cr("thread is " INTPTR_FORMAT " from pc " INTPTR_FORMAT, |
| p2i(_thread), p2i(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 |