src/hotspot/share/runtime/unhandledOops.cpp
author stefank
Thu, 09 May 2019 14:28:30 +0200
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8223624: Cleanup includes of universe.hpp Reviewed-by: coleenp, lkorinth
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/*
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 * Copyright (c) 2005, 2015, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "gc/shared/collectedHeap.hpp"
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#include "oops/oop.inline.hpp"
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#include "runtime/thread.hpp"
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#include "runtime/unhandledOops.hpp"
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#include "utilities/globalDefinitions.hpp"
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#ifdef CHECK_UNHANDLED_OOPS
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const int free_list_size = 256;
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UnhandledOops::UnhandledOops(Thread* thread) {
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  _thread = thread;
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  _oop_list = new (ResourceObj::C_HEAP, mtInternal)
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                    GrowableArray<UnhandledOopEntry>(free_list_size, true);
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  _level = 0;
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}
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UnhandledOops::~UnhandledOops() {
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  delete _oop_list;
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}
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void UnhandledOops::dump_oops(UnhandledOops *list) {
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  for (int k = 0; k < list->_oop_list->length(); k++) {
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    UnhandledOopEntry entry = list->_oop_list->at(k);
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    tty->print(" " INTPTR_FORMAT, p2i(entry._oop_ptr));
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  }
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  tty->cr();
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}
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// For debugging unhandled oop detector _in the debugger_
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// You don't want to turn it on in compiled code here.
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static bool unhandled_oop_print=0;
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void UnhandledOops::register_unhandled_oop(oop* op, address pc) {
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  if (!_thread->is_in_stack((address)op))
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    return;
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  _level ++;
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  if (unhandled_oop_print) {
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    for (int i=0; i<_level; i++) tty->print(" ");
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    tty->print_cr("r " INTPTR_FORMAT, p2i(op));
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  }
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  UnhandledOopEntry entry(op, pc);
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  _oop_list->push(entry);
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}
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bool match_oop_entry(void *op, UnhandledOopEntry e) {
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  return (e.oop_ptr() == op);
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}
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// Mark unhandled oop as okay for GC - the containing struct has an oops_do and
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// for some reason the oop has to be on the stack.
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// May not be called for the current thread, as in the case of
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// VM_GetOrSetLocal in jvmti.
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void UnhandledOops::allow_unhandled_oop(oop* op) {
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  assert (CheckUnhandledOops, "should only be called with checking option");
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  int i = _oop_list->find_from_end(op, match_oop_entry);
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  assert(i!=-1, "safe for gc oop not in unhandled_oop_list");
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  UnhandledOopEntry entry = _oop_list->at(i);
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  assert(!entry._ok_for_gc, "duplicate entry");
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  entry._ok_for_gc = true;
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  _oop_list->at_put(i, entry);
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}
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// Called by the oop destructor to remove unhandled oop from the thread's
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// oop list.  All oops given are assumed to be on the list.  If not,
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// there's a bug in the unhandled oop detector.
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void UnhandledOops::unregister_unhandled_oop(oop* op) {
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  if (!_thread->is_in_stack((address)op)) return;
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  _level --;
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  if (unhandled_oop_print) {
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    for (int i=0; i<_level; i++) tty->print(" ");
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    tty->print_cr("u " INTPTR_FORMAT, p2i(op));
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  }
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  int i = _oop_list->find_from_end(op, match_oop_entry);
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  assert(i!=-1, "oop not in unhandled_oop_list");
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  _oop_list->remove_at(i);
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}
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void UnhandledOops::clear_unhandled_oops() {
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  assert (CheckUnhandledOops, "should only be called with checking option");
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  for (int k = 0; k < _oop_list->length(); k++) {
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    UnhandledOopEntry entry = _oop_list->at(k);
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    // If an entry is on the unhandled oop list but isn't on the stack
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    // anymore, it must not have gotten unregistered properly and it's a bug
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    // in the unhandled oop generator.
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    if(!_thread->is_in_stack((address)entry._oop_ptr)) {
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      tty->print_cr("oop_ptr is " INTPTR_FORMAT, p2i(entry._oop_ptr));
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      tty->print_cr("thread is " INTPTR_FORMAT " from pc " INTPTR_FORMAT,
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                     p2i(_thread), p2i(entry._pc));
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      assert(false, "heap is corrupted by the unhandled oop detector");
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    }
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    // Set unhandled oops to a pattern that will crash distinctively
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    if (!entry._ok_for_gc) *(intptr_t*)(entry._oop_ptr) = BAD_OOP_ADDR;
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  }
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}
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#endif // CHECK_UNHANDLED_OOPS