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annotate graal/Compiler/src/com/sun/c1x/ir/StorePointer.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) 2009, 2011, 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.debug.*;
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26 import com.sun.c1x.value.*;
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27 import com.sun.cri.ci.*;
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28
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29 /**
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30 * The {@code StorePointer} instruction represents a write of a pointer.
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31 * This instruction is part of the HIR support for low-level operations, such as safepoints,
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32 * stack banging, etc, and does not correspond to a Java operation.
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33 *
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34 * @author Ben L. Titzer
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35 * @author Doug Simon
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36 */
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37 public final class StorePointer extends PointerOp {
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38
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39 Value value;
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40
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41 /**
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42 * Creates an instruction for a pointer store. If {@code displacement != null}, the effective of the address of the store is
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43 * computed as the pointer plus a byte displacement plus a scaled index. Otherwise, the effective address is computed as the
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44 * pointer plus a byte offset.
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45 * @param dataKind the kind of value at the address accessed by the pointer operation
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46 * @param pointer the value producing the pointer
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47 * @param displacement the value producing the displacement. This may be {@code null}.
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48 * @param offsetOrIndex the value producing the scaled-index or the byte offset depending on whether {@code displacement} is {@code null}
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49 * @param value the value to write to the pointer
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50 * @param stateBefore the state before
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51 * @param isVolatile {@code true} if the access is volatile
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52 */
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53 public StorePointer(int opcode, CiKind dataKind, Value pointer, Value displacement, Value offsetOrIndex, Value value, FrameState stateBefore, boolean isVolatile) {
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54 super(CiKind.Void, dataKind, opcode, pointer, displacement, offsetOrIndex, stateBefore, isVolatile);
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55 this.value = value;
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56 setFlag(Flag.LiveStore);
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57 }
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58
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59 @Override
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60 public void accept(ValueVisitor v) {
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61 v.visitStorePointer(this);
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62 }
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63
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64 public Value value() {
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65 return value;
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66 }
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67
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68 @Override
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69 public void inputValuesDo(ValueClosure closure) {
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70 super.inputValuesDo(closure);
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71 value = closure.apply(value);
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72 }
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73
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74 @Override
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75 public void print(LogStream out) {
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76 out.print("*(").print(pointer);
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77 if (displacement() == null) {
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78 out.print(" + ").print(offset());
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79 } else {
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80 out.print(" + ").print(displacement()).print(" + (").print(index()).print(" * sizeOf(" + dataKind.name() + "))");
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81 }
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82 out.print(") := ").print(value());
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83 }
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84
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85 }