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annotate truffle/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/expression/SLAddNode.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.expression;
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42
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43 import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
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44 import com.oracle.truffle.api.ExactMath;
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45 import com.oracle.truffle.api.dsl.ImplicitCast;
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46 import com.oracle.truffle.api.dsl.Specialization;
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47 import com.oracle.truffle.api.nodes.NodeInfo;
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48 import com.oracle.truffle.api.source.SourceSection;
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49 import com.oracle.truffle.sl.nodes.SLBinaryNode;
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50 import com.oracle.truffle.sl.nodes.SLTypes;
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51 import java.math.BigInteger;
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52
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53 /**
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54 * SL node that performs the "+" operation, which performs addition on arbitrary precision numbers,
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55 * as well as String concatenation if one of the operands is a String.
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56 * <p>
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57 * Type specialization on the input values is essential for the performance. This is achieved via
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58 * node rewriting: specialized subclasses handle just a single type, so that the generic node that
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59 * can handle all types is used only in cases where different types were encountered. The subclasses
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60 * are automatically generated by the Truffle DSL. In addition, a {@link SLAddNodeGen factory class}
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61 * is generated that provides, e.g., {@link SLAddNodeGen#create node creation}.
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62 */
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63 @NodeInfo(shortName = "+")
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64 public abstract class SLAddNode extends SLBinaryNode {
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65
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66 public SLAddNode(SourceSection src) {
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67 super(src);
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68 }
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69
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70 /**
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71 * Specialization for primitive {@code long} values. This is the fast path of the
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72 * arbitrary-precision arithmetic. We need to check for overflows of the addition, and switch to
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73 * the {@link #add(BigInteger, BigInteger) slow path}. Therefore, we use an
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74 * {@link ExactMath#addExact(long, long) addition method that throws an exception on overflow}.
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75 * The {@code rewriteOn} attribute on the {@link Specialization} annotation automatically
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76 * triggers the node rewriting on the exception.
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77 * <p>
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78 * In compiled code, {@link ExactMath#addExact(long, long) addExact} is compiled to efficient
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79 * machine code that uses the processor's overflow flag. Therefore, this method is compiled to
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80 * only two machine code instructions on the fast path.
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81 * <p>
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82 * This specialization is automatically selected by the Truffle DSL if both the left and right
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83 * operand are {@code long} values.
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84 */
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85 @Specialization(rewriteOn = ArithmeticException.class)
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86 protected long add(long left, long right) {
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87 return ExactMath.addExact(left, right);
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88 }
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89
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90 /**
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91 * This is the slow path of the arbitrary-precision arithmetic. The {@link BigInteger} type of
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92 * Java is doing everything we need.
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93 * <p>
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94 * This specialization is automatically selected by the Truffle DSL if both the left and right
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95 * operand are {@link BigInteger} values. Because the type system defines an
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96 * {@link ImplicitCast implicit conversion} from {@code long} to {@link BigInteger} in
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97 * {@link SLTypes#castBigInteger(long)}, this specialization is also taken if the left or the
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98 * right operand is a {@code long} value. Because the {@link #add(long, long) long}
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99 * specialization} has the {@code rewriteOn} attribute, this specialization is also taken if
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100 * both input values are {@code long} values but the primitive addition overflows.
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101 */
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102 @Specialization
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103 @TruffleBoundary
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104 protected BigInteger add(BigInteger left, BigInteger right) {
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105 return left.add(right);
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106 }
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107
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108 /**
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109 * Specialization for String concatenation. The SL specification says that String concatenation
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110 * works if either the left or the right operand is a String. The non-string operand is
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111 * converted then automatically converted to a String.
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112 * <p>
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113 * To implement these semantics, we tell the Truffle DSL to use a custom guard. The guard
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114 * function is defined in {@link #isString this class}, but could also be in any superclass.
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115 */
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116 @Specialization(guards = "isString(left, right)")
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117 @TruffleBoundary
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118 protected String add(Object left, Object right) {
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119 return left.toString() + right.toString();
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120 }
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121
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122 /**
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123 * Guard for String concatenation: returns true if either the left or the right operand is a
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124 * {@link String}.
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125 */
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126 protected boolean isString(Object a, Object b) {
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127 return a instanceof String || b instanceof String;
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128 }
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129 }