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annotate graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/local/SLWriteLocalVariableNode.java @ 19302:45a24e9ba03b

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SL: update isKind methods for local variables to bind a dynamic parameter.
author Christian Humer <christian.humer@gmail.com>
date Wed, 11 Feb 2015 19:11:56 +0100
parents bf846a813688
children
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1 /*
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2 * Copyright (c) 2012, 2014, 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.oracle.truffle.sl.nodes.local;
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24
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25 import com.oracle.truffle.api.*;
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26 import com.oracle.truffle.api.dsl.*;
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27 import com.oracle.truffle.api.frame.*;
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28 import com.oracle.truffle.api.source.*;
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29 import com.oracle.truffle.sl.nodes.*;
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30
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31 /**
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32 * Node to write a local variable to a function's {@link VirtualFrame frame}. The Truffle frame API
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33 * allows to store primitive values of all Java primitive types, and Object values.
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34 */
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35 @NodeChild("valueNode")
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36 @NodeField(name = "slot", type = FrameSlot.class)
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37 public abstract class SLWriteLocalVariableNode extends SLExpressionNode {
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38
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39 public SLWriteLocalVariableNode(SourceSection src) {
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40 super(src);
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41 }
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42
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43 /**
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44 * Returns the descriptor of the accessed local variable. The implementation of this method is
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45 * created by the Truffle DSL based on the {@link NodeField} annotation on the class.
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46 */
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47 protected abstract FrameSlot getSlot();
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48
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49 /**
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50 * Specialized method to write a primitive {@code long} value. This is only possible if the
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51 * local variable also has currently the type {@code long}, therefore a Truffle DSL
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52 * {@link #isLongKind(VirtualFrame) custom guard} is specified.
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53 */
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54 @Specialization(guards = "isLongKind(frame)")
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55 protected long writeLong(VirtualFrame frame, long value) {
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56 frame.setLong(getSlot(), value);
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57 return value;
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58 }
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59
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60 @Specialization(guards = "isBooleanKind(frame)")
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61 protected boolean writeBoolean(VirtualFrame frame, boolean value) {
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62 frame.setBoolean(getSlot(), value);
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63 return value;
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64 }
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65
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66 /**
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67 * Generic write method that works for all possible types.
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68 * <p>
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69 * Why is this method annotated with {@link Specialization} and not {@link Fallback}? For a
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70 * {@link Fallback} method, the Truffle DSL generated code would try all other specializations
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71 * first before calling this method. We know that all these specializations would fail their
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72 * guards, so there is no point in calling them. Since this method takes a value of type
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73 * {@link Object}, it is guaranteed to never fail, i.e., once we are in this specialization the
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74 * node will never be re-specialized.
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75 */
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76 @Specialization(contains = {"writeLong", "writeBoolean"})
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77 protected Object write(VirtualFrame frame, Object value) {
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78 if (getSlot().getKind() != FrameSlotKind.Object) {
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79 /*
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80 * The local variable has still a primitive type, we need to change it to Object. Since
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81 * the variable type is important when the compiler optimizes a method, we also discard
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82 * compiled code.
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83 */
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84 CompilerDirectives.transferToInterpreterAndInvalidate();
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85 getSlot().setKind(FrameSlotKind.Object);
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86 }
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87 frame.setObject(getSlot(), value);
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88 return value;
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89 }
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90
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91 /**
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92 * Guard function that the local variable has the type {@code long}.
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93 */
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94 @SuppressWarnings("unused")
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95 protected boolean isLongKind(VirtualFrame frame) {
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96 return isKind(FrameSlotKind.Long);
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97 }
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98
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99 @SuppressWarnings("unused")
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100 protected boolean isBooleanKind(VirtualFrame frame) {
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101 return isKind(FrameSlotKind.Boolean);
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102 }
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103
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104 private boolean isKind(FrameSlotKind kind) {
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105 if (getSlot().getKind() == kind) {
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106 /* Success: the frame slot has the expected kind. */
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107 return true;
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108 } else if (getSlot().getKind() == FrameSlotKind.Illegal) {
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109 /*
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110 * This is the first write to this local variable. We can set the type to the one we
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111 * expect. Since the variable type is important when the compiler optimizes a method, we
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112 * also discard compiled code.
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113 */
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114 CompilerDirectives.transferToInterpreterAndInvalidate();
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115 getSlot().setKind(kind);
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116 return true;
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117 } else {
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118 /*
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119 * Failure: the frame slot has the wrong kind, the Truffle DSL generated code will
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120 * choose a different specialization.
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121 */
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122 return false;
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123 }
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124 }
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125 }