/* * 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(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"); 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