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6977924: Changes for 6975078 produce build error with certain gcc versions Summary: The changes introduced for 6975078 assign badHeapOopVal to the _allocation field in the ResourceObj class. In 32 bit linux builds with certain versions of gcc this assignment will be flagged as an error while compiling allocation.cpp. In 32 bit builds the constant value badHeapOopVal (which is cast to an intptr_t) is negative. The _allocation field is typed as an unsigned intptr_t and gcc catches this as an error. Reviewed-by: jcoomes, ysr, phh
author johnc
date Wed, 18 Aug 2010 10:59:06 -0700
parents c18cbe5936b8
children 30f67acf635d
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/*
 * Copyright (c) 2005, 2007, 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.
 *
 */

// HeapDumper is used to dump the java heap to file in HPROF binary format:
//
//  { HeapDumper dumper(true /* full GC before heap dump */);
//    if (dumper.dump("/export/java.hprof")) {
//      ResourceMark rm;
//      tty->print_cr("Dump failed: %s", dumper.error_as_C_string());
//    } else {
//      // dump succeeded
//    }
//  }
//

class HeapDumper : public StackObj {
 private:
  char* _error;
  bool _print_to_tty;
  bool _gc_before_heap_dump;
  elapsedTimer _t;

  // string representation of error
  char* error() const                   { return _error; }
  void set_error(char* error);

  // indicates if progress messages can be sent to tty
  bool print_to_tty() const             { return _print_to_tty; }

  // internal timer.
  elapsedTimer* timer()                 { return &_t; }

 public:
  HeapDumper(bool gc_before_heap_dump) :
    _gc_before_heap_dump(gc_before_heap_dump), _error(NULL), _print_to_tty(false) { }
  HeapDumper(bool gc_before_heap_dump, bool print_to_tty) :
    _gc_before_heap_dump(gc_before_heap_dump), _error(NULL), _print_to_tty(print_to_tty) { }

  ~HeapDumper();

  // dumps the heap to the specified file, returns 0 if success.
  int dump(const char* path);

  // returns error message (resource allocated), or NULL if no error
  char* error_as_C_string() const;

  static void dump_heap()    KERNEL_RETURN;
};