1 /*
   2  * Copyright (c) 2003, 2007, Oracle and/or its affiliates. All rights reserved.
   3  * Copyright 2008, 2009 Red Hat, Inc.
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This code is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 only, as
   8  * published by the Free Software Foundation.
   9  *
  10  * This code is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * version 2 for more details (a copy is included in the LICENSE file that
  14  * accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License version
  17  * 2 along with this work; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  21  * or visit www.oracle.com if you need additional information or have any
  22  * questions.
  23  *
  24  */
  25 
  26 // |  ...               |
  27 // +--------------------+  ------------------
  28 // | stack slot n-1     |       low addresses
  29 // |  ...               |
  30 // | stack slot 0       |
  31 // | monitor m-1        |
  32 // |  ...               |
  33 // | monitor 0          |
  34 // | oop_tmp            |
  35 // | method             |
  36 // | unextended_sp      |
  37 // | pc                 |
  38 // | frame_type         |
  39 // | next_frame         |      high addresses
  40 // +--------------------+  ------------------
  41 // |  ...               |
  42 
  43 class SharkFrame : public ZeroFrame {
  44   friend class SharkStack;
  45 
  46  private:
  47   SharkFrame() : ZeroFrame() {
  48     ShouldNotCallThis();
  49   }
  50 
  51  protected:
  52   enum Layout {
  53     pc_off = jf_header_words,
  54     unextended_sp_off,
  55     method_off,
  56     oop_tmp_off,
  57     header_words
  58   };
  59 
  60  public:
  61   address pc() const {
  62     return (address) value_of_word(pc_off);
  63   }
  64 
  65   intptr_t* unextended_sp() const {
  66     return (intptr_t *) value_of_word(unextended_sp_off);
  67   }
  68 
  69   methodOop method() const {
  70     return (methodOop) value_of_word(method_off);
  71   }
  72 
  73  public:
  74   void identify_word(int   frame_index,
  75                      int   offset,
  76                      char* fieldbuf,
  77                      char* valuebuf,
  78                      int   buflen) const;
  79 };