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1 /*
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2 * Copyright 2000-2001 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 package sun.jvm.hotspot.asm.sparc;
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26
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27 import sun.jvm.hotspot.asm.*;
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28 import sun.jvm.hotspot.utilities.*;
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29
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30 /** SPARCArgument is an abstraction used to represent an outgoing
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31 actual argument or an incoming formal parameter, whether it
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32 resides in memory or in a register, in a manner consistent with
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33 the SPARC Application Binary Interface, or ABI. This is often
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34 referred to as the native or C calling convention. */
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35
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36 public class SPARCArgument {
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37 private int number;
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38 private boolean isIn;
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39
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40 // FIXME: add 64-bit stuff here (support for FP registers)
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41
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42 /** Only 6 registers may contain integer parameters */
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43 public static final int NUM_REGISTER_PARAMETERS = 6;
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44
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45 public SPARCArgument(int number, boolean isIn) {
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46 this.number = number;
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47 this.isIn = isIn;
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48 }
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49
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50 int getNumber() { return number; }
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51 boolean getIsIn() { return isIn; }
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52 boolean getIsOut() { return !getIsIn(); }
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53
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54 public SPARCArgument getSuccessor() { return new SPARCArgument(getNumber() + 1, getIsIn()); }
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55 public SPARCArgument asIn() { return new SPARCArgument(getNumber(), true); }
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56 public SPARCArgument asOut() { return new SPARCArgument(getNumber(), false); }
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57
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58 /** Locating register-based arguments */
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59 public boolean isRegister() { return number < NUM_REGISTER_PARAMETERS; }
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60
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61 public SPARCRegister asRegister() {
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62 if (Assert.ASSERTS_ENABLED) {
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63 Assert.that(isRegister(), "must be a register argument");
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64 }
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65 return new SPARCRegister(getIsIn() ? SPARCRegisterType.IN : SPARCRegisterType.OUT, getNumber());
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66 }
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67
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68 // locating memory-based arguments (FIXME: elided for now, will
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69 // necessitate creating new SPARCAddress class)
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70 // public SPARCAddress asAddress() {
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71 // if (Assert.ASSERTS_ENABLED) {
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72 // Assert.that(!isRegister(), "must be a memory argument");
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73 // }
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74 // return addressInFrame();
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75 // }
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76 //
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77 // /** When applied to a register-based argument, give the corresponding address
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78 // into the 6-word area "into which callee may store register arguments"
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79 // (This is a different place than the corresponding register-save area location.) */
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80 // public SPARCAddress addressInFrame() const {
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81 // return SPARCAddress( is_in() ? Address::extra_in_argument
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82 // : Address::extra_out_argument,
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83 // _number );
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84 // }
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85 }
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