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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

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 * This code is free software; you can redistribute it and/or modify it

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 * 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.

 *

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// machine-dependent implemention for register maps

  friend class frame;

  friend class MethodHandles;

 private:

  intptr_t* _window;         // register window save area (for L and I regs)

  intptr_t* _younger_window; // previous save area (for O regs, if needed)

  address pd_location(VMReg reg) const;

  void pd_clear();

  void pd_initialize_from(const RegisterMap* map) {

    _window         = map->_window;

    _younger_window = map->_younger_window;

    _location_valid[0] = 0;  // avoid the shift_individual_registers game

  }

  void pd_initialize() {

    _window = NULL;

    _younger_window = NULL;

    _location_valid[0] = 0;  // avoid the shift_individual_registers game

  }

  void shift_window(intptr_t* sp, intptr_t* younger_sp) {

    _window         = sp;

    _younger_window = younger_sp;

    // Throw away locations for %i, %o, and %l registers:

    // But do not throw away %g register locs.

    if (_location_valid[0] != 0)  shift_individual_registers();

  }

  void shift_individual_registers();

  // When popping out of compiled frames, we make all IRegs disappear.

  void make_integer_regs_unsaved() { _location_valid[0] = 0; }