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Truffle-DSL: assumptions javadoc fixes.
author Christian Humer <christian.humer@gmail.com>
date Wed, 11 Feb 2015 21:51:26 +0100
parents 6135f3a3fa45
children
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1 /*
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2 * Copyright (c) 2015, 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.api.dsl.test.examples;
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24
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25 import static com.oracle.truffle.api.dsl.test.examples.ExampleNode.*;
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26 import static org.junit.Assert.*;
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27
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28 import org.junit.*;
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29
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30 import com.oracle.truffle.api.*;
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31 import com.oracle.truffle.api.dsl.*;
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32 import com.oracle.truffle.api.dsl.test.examples.FunctionCallFactory.FunctionCallNodeGen;
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33 import com.oracle.truffle.api.frame.*;
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34 import com.oracle.truffle.api.nodes.*;
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35
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36 /**
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37 * This example illustrates how {@link Cached} can be used to implement function calls that use
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38 * local state for its guards. If there are always distinct Function objects with distinct
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39 * CallTargets then we can use the directCallFunctionGuard specialization. If there are two Function
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40 * instances cached with the same CallTarget then we use the directCall cache. We do this because
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41 * the directCallFunctionGuard specialization can use a faster guard.
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42 */
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43 @SuppressWarnings("unused")
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44 public class FunctionCall {
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45
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46 @Test
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47 public void testFunctionCall() {
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48 assertEquals(2, FunctionCallNode.CACHE_SIZE);
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49
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50 CallTarget dummyTarget1 = createDummyTarget(0);
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51 CallTarget dummyTarget2 = createDummyTarget(0);
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52 CallTarget dummyTarget3 = createDummyTarget(0);
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53
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54 Function dummyFunction1 = new Function(dummyTarget1);
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55 Function dummyFunction2 = new Function(dummyTarget2);
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56 Function dummyFunction3 = new Function(dummyTarget2); // same target as dummyFunction2
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57 Function dummyFunction4 = new Function(dummyTarget3);
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58
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59 FunctionCallNode node = FunctionCallNodeGen.create(createArguments(2));
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60 CallTarget target = createTarget(node);
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61 assertEquals(42, target.call(dummyFunction1, 42));
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62 assertEquals(43, target.call(dummyFunction2, 43));
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63 assertEquals(44, target.call(dummyFunction3, 44)); // transition to directCall
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64 assertEquals(2, node.directCallFunctionGuard);
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65 assertEquals(1, node.directCall);
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66
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67 assertEquals(42, target.call(dummyFunction1, 42));
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68 assertEquals(43, target.call(dummyFunction2, 43));
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69 assertEquals(2, node.directCallFunctionGuard);
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70 assertEquals(3, node.directCall);
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71
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72 assertEquals(44, target.call(dummyFunction4, 44)); // transition to indirectCall
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73 assertEquals(2, node.directCallFunctionGuard);
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74 assertEquals(3, node.directCall);
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75 assertEquals(1, node.indirectCall);
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76
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77 assertEquals(42, target.call(dummyFunction1, 42));
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78 assertEquals(43, target.call(dummyFunction2, 43));
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79 assertEquals(44, target.call(dummyFunction3, 44));
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80 assertEquals(2, node.directCallFunctionGuard);
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81 assertEquals(3, node.directCall);
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82 assertEquals(4, node.indirectCall);
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83 }
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84
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85 public static class FunctionCallNode extends ExampleNode {
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86
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87 public static final int CACHE_SIZE = 2;
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88
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89 private Function[] cachedFunctions = new Function[CACHE_SIZE];
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90
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91 private int directCallFunctionGuard;
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92 private int directCall;
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93 private int indirectCall;
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94
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95 @Specialization(limit = "CACHE_SIZE", guards = {"function == cachedFunction", "cacheFunctionTarget(cachedFunction)"})
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96 public Object directCallFunctionGuard(VirtualFrame frame, Function function, Object argument, //
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97 @Cached("function") Function cachedFunction, //
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98 @Cached("create(cachedFunction.getTarget())") DirectCallNode callNode) {
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99 directCallFunctionGuard++;
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100 return callNode.call(frame, new Object[]{argument});
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101 }
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102
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103 protected final boolean cacheFunctionTarget(Function function) {
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104 CompilerAsserts.neverPartOfCompilation();
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105 if (cachedFunctions != null) {
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106 for (int i = 0; i < cachedFunctions.length; i++) {
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107 Function cachedFunction = cachedFunctions[i];
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108 if (cachedFunction == null) {
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109 cachedFunctions[i] = function;
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110 return true;
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111 } else if (cachedFunction == function) {
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112 return true;
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113 } else if (cachedFunction.getTarget() == function.getTarget()) {
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114 cachedFunctions = null;
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115 return false;
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116 }
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117 }
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118 }
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119 return false;
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120 }
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121
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122 @Specialization(limit = "CACHE_SIZE", contains = "directCallFunctionGuard", guards = {"function.getTarget() == cachedTarget"})
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123 protected Object directCall(VirtualFrame frame, Function function, Object argument, //
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124 @Cached("function.getTarget()") CallTarget cachedTarget, //
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125 @Cached("create(cachedTarget)") DirectCallNode callNode) {
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126 directCall++;
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127 return callNode.call(frame, new Object[]{argument});
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128 }
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129
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130 @Specialization(contains = "directCall")
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131 protected Object indirectCall(VirtualFrame frame, Function function, Object argument, //
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132 @Cached("create()") IndirectCallNode callNode) {
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133 indirectCall++;
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134 return callNode.call(frame, function.getTarget(), new Object[]{argument});
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135 }
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136 }
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137
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138 public static class Function {
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139
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140 private final CallTarget target;
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141
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142 public Function(CallTarget target) {
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143 this.target = target;
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144 }
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145
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146 public CallTarget getTarget() {
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147 return target;
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148 }
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149 }
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150
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151 }