1 /*
   2  * Copyright 2003-2007 Sun Microsystems, Inc.  All Rights Reserved.
   3  * Copyright 2008 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  */
  25 
  26 // |  ...               |
  27 // +--------------------+  ------------------
  28 // | parameter n-1      |       low addresses
  29 // |  ...               |
  30 // | parameter 0        |
  31 // | call_wrapper       |
  32 // | frame_type         |
  33 // | next_frame         |      high addresses
  34 // +--------------------+  ------------------
  35 // |  ...               |
  36 
  37 class EntryFrame : public ZeroFrame {
  38  private:
  39   EntryFrame() : ZeroFrame() {
  40     ShouldNotCallThis();
  41   }
  42 
  43  protected:
  44   enum Layout {
  45     call_wrapper_off = jf_header_words,
  46     header_words
  47   };
  48 
  49  public:
  50   static EntryFrame *build(ZeroStack*       stack,
  51                            const intptr_t*  parameters,
  52                            int              parameter_words,
  53                            JavaCallWrapper* call_wrapper);
  54  public:
  55   JavaCallWrapper *call_wrapper() const {
  56     return (JavaCallWrapper *) value_of_word(call_wrapper_off);
  57   }
  58 
  59  public:
  60   void identify_word(int   frame_index,
  61                      int   offset,
  62                      char* fieldbuf,
  63                      char* valuebuf,
  64                      int   buflen) const;
  65 };