/*

 * Copyright 1997-2007 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 *

 */

// A frame represents a physical stack frame (an activation).  Frames can be

// C or Java frames, and the Java frames can be interpreted or compiled.

// In contrast, vframes represent source-level activations, so that one physical frame

// can correspond to multiple source level frames because of inlining.

// A frame is comprised of {pc, fp, sp}

// ------------------------------ Asm interpreter ----------------------------------------

// Layout of asm interpreter frame:

//    [expression stack      ] * <- sp

//    [monitors              ]   \

//     ...                        | monitor block size

//    [monitors              ]   /

//    [monitor block size    ]

//    [byte code index/pointr]                   = bcx()                bcx_offset

//    [pointer to locals     ]                   = locals()             locals_offset

//    [constant pool cache   ]                   = cache()              cache_offset

//    [methodData            ]                   = mdp()                mdx_offset

//    [methodOop             ]                   = method()             method_offset

//    [last sp               ]                   = last_sp()            last_sp_offset

//    [old stack pointer     ]                     (sender_sp)          sender_sp_offset

//    [old frame pointer     ]   <- fp           = link()

//    [return pc             ]

//    [oop temp              ]                     (only for native calls)

//    [locals and parameters ]

//                               <- sender sp

// ------------------------------ Asm interpreter ----------------------------------------

// ------------------------------ C++ interpreter ----------------------------------------

//

// Layout of C++ interpreter frame: (While executing in BytecodeInterpreter::run)

//

//                             <- SP (current esp/rsp)

//    [local variables         ] BytecodeInterpreter::run local variables

//    ...                        BytecodeInterpreter::run local variables

//    [local variables         ] BytecodeInterpreter::run local variables

//    [old frame pointer       ]   fp [ BytecodeInterpreter::run's ebp/rbp ]

//    [return pc               ]  (return to frame manager)

//    [interpreter_state*      ]  (arg to BytecodeInterpreter::run)   --------------

//    [expression stack        ] <- last_Java_sp                           |

//    [...                     ] * <- interpreter_state.stack              |

//    [expression stack        ] * <- interpreter_state.stack_base         |

//    [monitors                ]   \                                       |

//     ...                          | monitor block size                   |

//    [monitors                ]   / <- interpreter_state.monitor_base     |

//    [struct interpretState   ] <-----------------------------------------|

//    [return pc               ] (return to callee of frame manager [1]

//    [locals and parameters   ]

//                               <- sender sp

// [1] When the c++ interpreter calls a new method it returns to the frame

//     manager which allocates a new frame on the stack. In that case there

//     is no real callee of this newly allocated frame. The frame manager is

//     aware of the  additional frame(s) and will pop them as nested calls

//     complete. Howevers tTo make it look good in the debugger the frame

//     manager actually installs a dummy pc pointing to RecursiveInterpreterActivation

//     with a fake interpreter_state* parameter to make it easy to debug

//     nested calls.

// Note that contrary to the layout for the assembly interpreter the

// expression stack allocated for the C++ interpreter is full sized.

// However this is not as bad as it seems as the interpreter frame_manager

// will truncate the unused space on succesive method calls.

//

// ------------------------------ C++ interpreter ----------------------------------------

 public:

  enum {

    pc_return_offset                                 =  0,

    // All frames

    link_offset                                      =  0,

    return_addr_offset                               =  1,

    // non-interpreter frames

    sender_sp_offset                                 =  2,

#ifndef CC_INTERP

    // Interpreter frames

    interpreter_frame_result_handler_offset          =  3, // for native calls only

    interpreter_frame_oop_temp_offset                =  2, // for native calls only

    interpreter_frame_sender_sp_offset               = -1,

    // outgoing sp before a call to an invoked method

    interpreter_frame_last_sp_offset                 = interpreter_frame_sender_sp_offset - 1,

    interpreter_frame_method_offset                  = interpreter_frame_last_sp_offset - 1,

    interpreter_frame_mdx_offset                     = interpreter_frame_method_offset - 1,

    interpreter_frame_cache_offset                   = interpreter_frame_mdx_offset - 1,

    interpreter_frame_locals_offset                  = interpreter_frame_cache_offset - 1,

    interpreter_frame_bcx_offset                     = interpreter_frame_locals_offset - 1,

    interpreter_frame_initial_sp_offset              = interpreter_frame_bcx_offset - 1,

    interpreter_frame_monitor_block_top_offset       = interpreter_frame_initial_sp_offset,

    interpreter_frame_monitor_block_bottom_offset    = interpreter_frame_initial_sp_offset,

#endif // CC_INTERP

    // Entry frames

#ifdef AMD64

#ifdef _WIN64

    entry_frame_after_call_words                     =  8,

    entry_frame_call_wrapper_offset                  =  2,

    arg_reg_save_area_bytes                          = 32, // Register argument save area

#else

    entry_frame_after_call_words                     = 13,

    entry_frame_call_wrapper_offset                  = -6,

    arg_reg_save_area_bytes                          =  0,

#endif // _WIN64

#else

    entry_frame_call_wrapper_offset                  =  2,

#endif // AMD64

    // Native frames

    native_frame_initial_param_offset                =  2

  };

  intptr_t ptr_at(int offset) const {

    return *ptr_at_addr(offset);

  }

  void ptr_at_put(int offset, intptr_t value) {

    *ptr_at_addr(offset) = value;

  }

 private:

  // an additional field beyond _sp and _pc:

  intptr_t*   _fp; // frame pointer

  // The interpreter and adapters will extend the frame of the caller.

  // Since oopMaps are based on the sp of the caller before extension

  // we need to know that value. However in order to compute the address

  // of the return address we need the real "raw" sp. Since sparc already

  // uses sp() to mean "raw" sp and unextended_sp() to mean the caller's

  // original sp we use that convention.

  intptr_t*     _unextended_sp;

  intptr_t* ptr_at_addr(int offset) const {

    return (intptr_t*) addr_at(offset);

  }

 public:

  // Constructors

  frame(intptr_t* sp, intptr_t* fp, address pc);

  frame(intptr_t* sp, intptr_t* unextended_sp, intptr_t* fp, address pc);

  frame(intptr_t* sp, intptr_t* fp);

  // accessors for the instance variables

  intptr_t*   fp() const { return _fp; }

  inline address* sender_pc_addr() const;

  // return address of param, zero origin index.

  inline address* native_param_addr(int idx) const;

  // expression stack tos if we are nested in a java call

  intptr_t* interpreter_frame_last_sp() const;

#ifndef CC_INTERP

  // deoptimization support

  void interpreter_frame_set_last_sp(intptr_t* sp);

#endif // CC_INTERP

#ifdef CC_INTERP

  inline interpreterState get_interpreterState() const;

#endif // CC_INTERP