1 /*
   2  * Copyright (c) 1998, 2007, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 // machine-dependent implemention for register maps
  26   friend class frame;
  27 
  28  private:
  29   intptr_t* _window;         // register window save area (for L and I regs)
  30   intptr_t* _younger_window; // previous save area (for O regs, if needed)
  31 
  32   address pd_location(VMReg reg) const;
  33   void pd_clear();
  34   void pd_initialize_from(const RegisterMap* map) {
  35     _window         = map->_window;
  36     _younger_window = map->_younger_window;
  37     _location_valid[0] = 0;  // avoid the shift_individual_registers game
  38   }
  39   void pd_initialize() {
  40     _window = NULL;
  41     _younger_window = NULL;
  42     _location_valid[0] = 0;  // avoid the shift_individual_registers game
  43   }
  44   void shift_window(intptr_t* sp, intptr_t* younger_sp) {
  45     _window         = sp;
  46     _younger_window = younger_sp;
  47     // Throw away locations for %i, %o, and %l registers:
  48     // But do not throw away %g register locs.
  49     if (_location_valid[0] != 0)  shift_individual_registers();
  50   }
  51   void shift_individual_registers();
  52   // When popping out of compiled frames, we make all IRegs disappear.
  53   void make_integer_regs_unsaved() { _location_valid[0] = 0; }