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annotate graal/Compiler/src/com/sun/c1x/ir/PointerOp.java @ 2507:9ec15d6914ca

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Pull over of compiler from maxine repository.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Wed, 27 Apr 2011 11:43:22 +0200
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2507
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1 /*
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2 * Copyright (c) 2010, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.sun.c1x.ir;
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24
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25 import com.sun.c1x.value.*;
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26 import com.sun.cri.ci.*;
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27
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28 /**
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29 * The base class for pointer access operations.
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30 *
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31 * @author Doug Simon
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32 */
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33 public abstract class PointerOp extends StateSplit {
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34
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35 /**
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36 * The kind of value at the address accessed by the pointer operation.
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37 */
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38 public final CiKind dataKind;
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39
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40 public final int opcode;
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41 protected Value pointer;
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42 protected Value displacement;
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43 protected Value offsetOrIndex;
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44 protected final boolean isVolatile;
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45 final boolean isPrefetch;
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46
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47 /**
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48 * Creates an instruction for a pointer operation. If {@code displacement != null}, the effective of the address of the operation is
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49 * computed as the pointer plus a byte displacement plus a scaled index. Otherwise, the effective address is computed as the
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50 * pointer plus a byte offset.
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51 *
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52 * @param kind the kind of value produced by this operation
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53 * @param dataKind the kind of value at the address accessed by the pointer operation
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54 * @param opcode the opcode of the instruction
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55 * @param pointer the value producing the pointer
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56 * @param displacement the value producing the displacement. This may be {@code null}.
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57 * @param offsetOrIndex the value producing the scaled-index or the byte offset depending on whether {@code displacement} is {@code null}
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58 * @param stateBefore the state before
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59 * @param isVolatile {@code true} if the access is volatile
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60 */
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61 public PointerOp(CiKind kind, CiKind dataKind, int opcode, Value pointer, Value displacement, Value offsetOrIndex, FrameState stateBefore, boolean isVolatile) {
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62 super(kind.stackKind(), stateBefore);
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63 this.opcode = opcode;
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64 this.pointer = pointer;
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65 this.dataKind = dataKind;
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66 this.displacement = displacement;
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67 this.offsetOrIndex = offsetOrIndex;
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68 this.isVolatile = isVolatile;
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69 this.isPrefetch = false;
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70 if (pointer.isNonNull()) {
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71 eliminateNullCheck();
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72 }
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73 }
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74
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75 public Value pointer() {
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76 return pointer;
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77 }
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78
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79 public Value index() {
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80 return offsetOrIndex;
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81 }
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82
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83 public Value offset() {
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84 return offsetOrIndex;
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85 }
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86
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87 public Value displacement() {
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88 return displacement;
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89 }
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90
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91 @Override
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92 public void runtimeCheckCleared() {
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93 clearState();
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94 }
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95
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96 /**
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97 * Checks whether this field access may cause a trap or an exception, which
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98 * is if it either requires a null check or needs patching.
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99 * @return {@code true} if this field access can cause a trap
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100 */
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101 @Override
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102 public boolean canTrap() {
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103 return needsNullCheck();
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104 }
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105
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106 /**
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107 * Iterates over the input values to this instruction.
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108 * @param closure the closure to apply to each value
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109 */
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110 @Override
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111 public void inputValuesDo(ValueClosure closure) {
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112 pointer = closure.apply(pointer);
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113 offsetOrIndex = closure.apply(offsetOrIndex);
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114 if (displacement != null) {
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115 displacement = closure.apply(displacement);
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116 }
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117 }
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118 }