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1 /*
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2 * Copyright 1998-2007 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // machine-dependent implemention for register maps
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26 friend class frame;
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27
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28 private:
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29 intptr_t* _window; // register window save area (for L and I regs)
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30 intptr_t* _younger_window; // previous save area (for O regs, if needed)
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31
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32 address pd_location(VMReg reg) const;
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33 void pd_clear();
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34 void pd_initialize_from(const RegisterMap* map) {
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35 _window = map->_window;
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36 _younger_window = map->_younger_window;
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37 _location_valid[0] = 0; // avoid the shift_individual_registers game
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38 }
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39 void pd_initialize() {
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40 _window = NULL;
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41 _younger_window = NULL;
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42 _location_valid[0] = 0; // avoid the shift_individual_registers game
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43 }
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44 void shift_window(intptr_t* sp, intptr_t* younger_sp) {
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45 _window = sp;
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46 _younger_window = younger_sp;
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47 // Throw away locations for %i, %o, and %l registers:
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48 // But do not throw away %g register locs.
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49 if (_location_valid[0] != 0) shift_individual_registers();
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50 }
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51 void shift_individual_registers();
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52 // When popping out of compiled frames, we make all IRegs disappear.
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53 void make_integer_regs_unsaved() { _location_valid[0] = 0; }
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