JDK14/Java14源码在线阅读

/*
 * Copyright (c) 2019, 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.
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 */

#ifndef SHARE_GC_SHARED_LOCATIONPRINTER_INLINE_HPP
#define SHARE_GC_SHARED_LOCATIONPRINTER_INLINE_HPP

#include "gc/shared/locationPrinter.hpp"
#include "oops/compressedOops.inline.hpp"
#include "oops/oopsHierarchy.hpp"

template <typename CollectedHeapT>
oop BlockLocationPrinter<CollectedHeapT>::base_oop_or_null(void* addr) {
  if (is_valid_obj(addr)) {
    // We were just given an oop directly.
    return oop(addr);
  }

  // Try to find addr using block_start.
  HeapWord* p = CollectedHeapT::heap()->block_start(addr);
  if (p != NULL && CollectedHeapT::heap()->block_is_obj(p)) {
    if (!is_valid_obj(p)) {
      return NULL;
    }
    return oop(p);
  }

  return NULL;
}

template <typename CollectedHeapT>
bool BlockLocationPrinter<CollectedHeapT>::print_location(outputStream* st, void* addr) {
  // Check if addr points into Java heap.
  if (CollectedHeapT::heap()->is_in(addr)) {
    oop o = base_oop_or_null(addr);
    if (o != NULL) {
      if ((void*)o == addr) {
        st->print(INTPTR_FORMAT " is an oop: ", p2i(addr));
      } else {
        st->print(INTPTR_FORMAT " is pointing into object: " , p2i(addr));
      }
      o->print_on(st);
      return true;
    }
  } else if (CollectedHeapT::heap()->is_in_reserved(addr)) {
    st->print_cr(INTPTR_FORMAT " is an unallocated location in the heap", p2i(addr));
    return true;
  }

  // Compressed oop needs to be decoded first.
#ifdef _LP64
  if (UseCompressedOops && ((uintptr_t)addr &~ (uintptr_t)max_juint) == 0) {
    narrowOop narrow_oop = (narrowOop)(uintptr_t)addr;

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