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annotate truffle/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/local/SLWriteLocalVariableNode.java @ 22157:dc83cc1f94f2

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Using fully qualified imports
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Wed, 16 Sep 2015 11:33:22 +0200
parents 503529c65456
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 * The Universal Permissive License (UPL), Version 1.0
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6 *
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7 * Subject to the condition set forth below, permission is hereby granted to any
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8 * person obtaining a copy of this software, associated documentation and/or
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9 * data (collectively the "Software"), free of charge and under any and all
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10 * copyright rights in the Software, and any and all patent rights owned or
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11 * freely licensable by each licensor hereunder covering either (i) the
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12 * unmodified Software as contributed to or provided by such licensor, or (ii)
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13 * the Larger Works (as defined below), to deal in both
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14 *
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15 * (a) the Software, and
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16 *
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17 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
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18 * one is included with the Software each a "Larger Work" to which the Software
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19 * is contributed by such licensors),
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20 *
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21 * without restriction, including without limitation the rights to copy, create
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22 * derivative works of, display, perform, and distribute the Software and make,
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23 * use, sell, offer for sale, import, export, have made, and have sold the
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24 * Software and the Larger Work(s), and to sublicense the foregoing rights on
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25 * either these or other terms.
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26 *
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27 * This license is subject to the following condition:
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28 *
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29 * The above copyright notice and either this complete permission notice or at a
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30 * minimum a reference to the UPL must be included in all copies or substantial
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31 * portions of the Software.
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32 *
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33 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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34 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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35 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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36 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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37 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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38 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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39 * SOFTWARE.
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40 */
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41 package com.oracle.truffle.sl.nodes.local;
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42
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43 import com.oracle.truffle.api.CompilerDirectives;
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44 import com.oracle.truffle.api.dsl.Fallback;
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45 import com.oracle.truffle.api.dsl.NodeChild;
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46 import com.oracle.truffle.api.dsl.NodeField;
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47 import com.oracle.truffle.api.dsl.Specialization;
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48 import com.oracle.truffle.api.frame.FrameSlot;
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49 import com.oracle.truffle.api.frame.FrameSlotKind;
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50 import com.oracle.truffle.api.frame.VirtualFrame;
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51 import com.oracle.truffle.api.source.SourceSection;
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52 import com.oracle.truffle.sl.nodes.SLExpressionNode;
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53
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54 /**
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55 * Node to write a local variable to a function's {@link VirtualFrame frame}. The Truffle frame API
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56 * allows to store primitive values of all Java primitive types, and Object values.
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57 */
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58 @NodeChild("valueNode")
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59 @NodeField(name = "slot", type = FrameSlot.class)
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60 public abstract class SLWriteLocalVariableNode extends SLExpressionNode {
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61
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62 public SLWriteLocalVariableNode(SourceSection src) {
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63 super(src);
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64 }
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65
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66 /**
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67 * Returns the descriptor of the accessed local variable. The implementation of this method is
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68 * created by the Truffle DSL based on the {@link NodeField} annotation on the class.
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69 */
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70 protected abstract FrameSlot getSlot();
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71
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72 /**
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73 * Specialized method to write a primitive {@code long} value. This is only possible if the
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74 * local variable also has currently the type {@code long}, therefore a Truffle DSL
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75 * {@link #isLongKind(VirtualFrame) custom guard} is specified.
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76 */
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77 @Specialization(guards = "isLongKind(frame)")
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78 protected long writeLong(VirtualFrame frame, long value) {
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79 frame.setLong(getSlot(), value);
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80 return value;
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81 }
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82
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83 @Specialization(guards = "isBooleanKind(frame)")
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84 protected boolean writeBoolean(VirtualFrame frame, boolean value) {
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85 frame.setBoolean(getSlot(), value);
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86 return value;
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87 }
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88
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89 /**
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90 * Generic write method that works for all possible types.
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91 * <p>
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92 * Why is this method annotated with {@link Specialization} and not {@link Fallback}? For a
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93 * {@link Fallback} method, the Truffle DSL generated code would try all other specializations
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94 * first before calling this method. We know that all these specializations would fail their
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95 * guards, so there is no point in calling them. Since this method takes a value of type
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96 * {@link Object}, it is guaranteed to never fail, i.e., once we are in this specialization the
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97 * node will never be re-specialized.
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98 */
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99 @Specialization(contains = {"writeLong", "writeBoolean"})
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100 protected Object write(VirtualFrame frame, Object value) {
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101 if (getSlot().getKind() != FrameSlotKind.Object) {
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102 /*
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103 * The local variable has still a primitive type, we need to change it to Object. Since
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104 * the variable type is important when the compiler optimizes a method, we also discard
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105 * compiled code.
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106 */
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107 CompilerDirectives.transferToInterpreterAndInvalidate();
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108 getSlot().setKind(FrameSlotKind.Object);
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109 }
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110 frame.setObject(getSlot(), value);
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111 return value;
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112 }
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113
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114 /**
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115 * Guard function that the local variable has the type {@code long}.
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116 */
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117 @SuppressWarnings("unused")
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118 protected boolean isLongKind(VirtualFrame frame) {
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119 return isKind(FrameSlotKind.Long);
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120 }
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121
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122 @SuppressWarnings("unused")
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123 protected boolean isBooleanKind(VirtualFrame frame) {
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124 return isKind(FrameSlotKind.Boolean);
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125 }
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126
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127 private boolean isKind(FrameSlotKind kind) {
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128 if (getSlot().getKind() == kind) {
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129 /* Success: the frame slot has the expected kind. */
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130 return true;
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131 } else if (getSlot().getKind() == FrameSlotKind.Illegal) {
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132 /*
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133 * This is the first write to this local variable. We can set the type to the one we
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134 * expect. Since the variable type is important when the compiler optimizes a method, we
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135 * also discard compiled code.
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136 */
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137 CompilerDirectives.transferToInterpreterAndInvalidate();
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138 getSlot().setKind(kind);
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139 return true;
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140 } else {
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141 /*
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142 * Failure: the frame slot has the wrong kind, the Truffle DSL generated code will
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143 * choose a different specialization.
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144 */
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145 return false;
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146 }
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147 }
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148 }