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annotate graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/local/SLWriteLocalVariableNode.java @ 13836:64c77f0577bb
More documentation and improvements of Simple Language
author | Christian Wimmer <christian.wimmer@oracle.com> |
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date | Thu, 30 Jan 2014 17:53:27 -0800 |
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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.sl.nodes.*; |
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29 |
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30 /** |
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31 * Node to write a local variable to a function's {@link VirtualFrame frame}. The Truffle frame API |
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32 * allows to store primitive values of all Java primitive types, and Object values. |
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33 */ |
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34 @NodeChild(value = "valueNode") |
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35 @NodeField(name = "slot", type = FrameSlot.class) |
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36 public abstract class SLWriteLocalVariableNode extends SLExpressionNode { |
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37 |
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38 /** |
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39 * Returns the descriptor of the accessed local variable. The implementation of this method is |
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40 * created by the Truffle DSL based on the {@link NodeField} annotation on the class. |
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41 */ |
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42 protected abstract FrameSlot getSlot(); |
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43 |
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44 /** |
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45 * Specialized method to write a primitive {@code long} value}. This is only possible if the |
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46 * local variable also has currently the type {@code long}, therefore a Truffle DSL |
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47 * {@link #isLongKind() custom guard} is specified. |
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48 */ |
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49 @Specialization(guards = "isLongKind") |
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50 protected long write(VirtualFrame frame, long value) { |
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51 frame.setLong(getSlot(), value); |
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52 return value; |
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53 } |
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54 |
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55 @Specialization(guards = "isBooleanKind") |
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56 protected boolean write(VirtualFrame frame, boolean value) { |
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57 frame.setBoolean(getSlot(), value); |
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58 return value; |
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59 } |
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60 |
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61 /** |
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62 * Generic write method that works for all possible types. |
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63 * <p> |
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64 * Why is this method annotated with {@link Specialization} and not {@link Generic}? For a |
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65 * {@link Generic} method, the Truffle DSL generated code would try all other specializations |
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66 * first before calling this method. We know that all these specializations would fail their |
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67 * guards, so there is no point in calling them. Since this method takes a value of type |
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68 * {@link Object}, it is guaranteed to never fail, i.e., once we are in this specialization the |
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69 * node will never be re-specialized. |
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70 */ |
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71 @Specialization |
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72 protected Object write(VirtualFrame frame, Object value) { |
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73 if (getSlot().getKind() != FrameSlotKind.Object) { |
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74 /* |
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75 * The local variable has still a primitive type, we need to change it to Object. Since |
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76 * the variable type is important when the compiler optimizes a method, we also discard |
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77 * compiled code. |
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78 */ |
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79 CompilerDirectives.transferToInterpreterAndInvalidate(); |
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80 getSlot().setKind(FrameSlotKind.Object); |
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81 } |
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82 frame.setObject(getSlot(), value); |
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83 return value; |
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84 } |
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85 |
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86 /** |
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87 * Guard function that the local variable has the type {@code long}. |
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88 */ |
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89 protected boolean isLongKind() { |
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90 return isKind(FrameSlotKind.Long); |
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91 } |
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92 |
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93 protected boolean isBooleanKind() { |
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94 return isKind(FrameSlotKind.Boolean); |
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95 } |
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96 |
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97 private boolean isKind(FrameSlotKind kind) { |
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98 if (getSlot().getKind() == kind) { |
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99 /* Success: the frame slot has the expected kind. */ |
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100 return true; |
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101 } else if (getSlot().getKind() == FrameSlotKind.Illegal) { |
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102 /* |
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103 * This is the first write to this local variable. We can set the type to the one we |
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104 * expect. Since the variable type is important when the compiler optimizes a method, we |
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105 * also discard compiled code. |
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106 */ |
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107 CompilerDirectives.transferToInterpreterAndInvalidate(); |
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108 getSlot().setKind(kind); |
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109 return true; |
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110 } else { |
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111 /* |
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112 * Failure: the frame slot has the wrong kind, the Truffle DSL generated code will |
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113 * choose a different specialization. |
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114 */ |
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115 return false; |
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116 } |
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117 } |
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118 } |