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author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Thu, 14 Jan 2016 14:20:57 +0100
parents 5309cc9668e3
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.createArguments;
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26 import static com.oracle.truffle.api.dsl.test.examples.ExampleNode.createTarget;
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27 import static org.junit.Assert.assertEquals;
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29 import java.util.HashMap;
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30 import java.util.Map;
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31
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32 import org.junit.Test;
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33
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34 import com.oracle.truffle.api.Assumption;
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35 import com.oracle.truffle.api.CallTarget;
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36 import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
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37 import com.oracle.truffle.api.dsl.Cached;
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38 import com.oracle.truffle.api.dsl.ImportStatic;
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39 import com.oracle.truffle.api.dsl.Specialization;
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40 import com.oracle.truffle.api.dsl.internal.SpecializedNode;
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41 import com.oracle.truffle.api.dsl.test.examples.RubyCallFactory.RubyDispatchNodeGen;
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42 import com.oracle.truffle.api.dsl.test.examples.RubyCallFactory.RubyHeadNodeGen;
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43 import com.oracle.truffle.api.dsl.test.examples.RubyCallFactory.RubyLookupNodeGen;
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44 import com.oracle.truffle.api.frame.VirtualFrame;
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45 import com.oracle.truffle.api.nodes.DirectCallNode;
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46 import com.oracle.truffle.api.nodes.IndirectCallNode;
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47 import com.oracle.truffle.api.nodes.Node;
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48 import com.oracle.truffle.api.utilities.CyclicAssumption;
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49
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50 /**
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51 * This example illustrates a simplified version of a Ruby function call semantics (RubyHeadNode).
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52 * The example usage shows how methods can be redefined in this implementation.
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53 */
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54 @SuppressWarnings("unused")
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55 public class RubyCall {
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56
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57 @Test
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58 public void testCall() {
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59 RubyHeadNode node = RubyHeadNodeGen.create(createArguments(4));
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60 CallTarget nodeTarget = createTarget(node);
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61 final Object firstArgument = "someArgument";
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62
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63 // dummyMethod is just going to return the some argument of the function
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64 final Object testMethodName = "getSomeArgument";
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65 // implementation returns first argument
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66 InternalMethod aClassTestMethod = new InternalMethod(ExampleNode.createDummyTarget(3));
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67 // implementation returns second argument
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68 InternalMethod bClassTestMethod = new InternalMethod(ExampleNode.createDummyTarget(4));
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69 // implementation returns third argument
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70 InternalMethod cClassTestMethod = new InternalMethod(ExampleNode.createDummyTarget(5));
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71
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72 // defines hierarchy C extends B extends A
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73 RubyClass aClass = new RubyClass("A", null);
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74 RubyClass bClass = new RubyClass("B", aClass);
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75 RubyClass cClass = new RubyClass("C", bClass);
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76
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77 RubyObject aInstance = new RubyObject(aClass);
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78 RubyObject bInstance = new RubyObject(bClass);
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79 RubyObject cInstance = new RubyObject(cClass);
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80
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81 // undefined method call
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82 assertEquals(RubyObject.NIL, nodeTarget.call(cInstance, testMethodName, null, new Object[]{firstArgument}));
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83
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84 // method defined in a
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85 aClass.addMethod(testMethodName, aClassTestMethod);
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86 assertEquals(firstArgument, nodeTarget.call(aInstance, testMethodName, null, new Object[]{firstArgument}));
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87 assertEquals(firstArgument, nodeTarget.call(bInstance, testMethodName, null, new Object[]{firstArgument}));
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88 assertEquals(firstArgument, nodeTarget.call(cInstance, testMethodName, null, new Object[]{firstArgument}));
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89
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90 // method redefined in b
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91 bClass.addMethod(testMethodName, bClassTestMethod);
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92 assertEquals(firstArgument, nodeTarget.call(aInstance, testMethodName, null, new Object[]{firstArgument}));
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93 assertEquals(firstArgument, nodeTarget.call(bInstance, testMethodName, null, new Object[]{null, firstArgument}));
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94 assertEquals(firstArgument, nodeTarget.call(cInstance, testMethodName, null, new Object[]{null, firstArgument}));
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95
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96 // method redefined in c
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97 cClass.addMethod(testMethodName, cClassTestMethod);
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98 assertEquals(firstArgument, nodeTarget.call(aInstance, testMethodName, null, new Object[]{firstArgument}));
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99 assertEquals(firstArgument, nodeTarget.call(bInstance, testMethodName, null, new Object[]{null, firstArgument}));
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100 assertEquals(firstArgument, nodeTarget.call(cInstance, testMethodName, null, new Object[]{null, null, firstArgument}));
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101
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102 }
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103
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104 public static class RubyHeadNode extends ExampleNode {
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105
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106 @Child private RubyLookupNode lookup = RubyLookupNodeGen.create();
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107 @Child private RubyDispatchNode dispatch = RubyDispatchNodeGen.create();
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108
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109 @Specialization
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110 public Object doCall(VirtualFrame frame, RubyObject receiverObject, Object methodName, Object blockObject, Object... argumentsObjects) {
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111 InternalMethod method = lookup.executeLookup(receiverObject, methodName);
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112
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113 Object[] packedArguments = new Object[argumentsObjects.length + 3];
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114 packedArguments[0] = method;
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115 packedArguments[1] = receiverObject;
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116 packedArguments[2] = blockObject;
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117 System.arraycopy(argumentsObjects, 0, packedArguments, 3, argumentsObjects.length);
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118
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119 return dispatch.executeDispatch(frame, method, packedArguments);
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120 }
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121 }
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122
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123 public abstract static class RubyLookupNode extends Node {
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124
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125 public abstract InternalMethod executeLookup(RubyObject receiver, Object method);
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126
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127 @Specialization(guards = "receiver.getRubyClass() == cachedClass", assumptions = "cachedClass.getDependentAssumptions()")
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128 protected static InternalMethod cachedLookup(RubyObject receiver, Object name, //
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129 @Cached("receiver.getRubyClass()") RubyClass cachedClass, //
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130 @Cached("genericLookup(receiver, name)") InternalMethod cachedLookup) {
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131 return cachedLookup;
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132 }
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133
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134 @Specialization(contains = "cachedLookup")
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135 protected static InternalMethod genericLookup(RubyObject receiver, Object name) {
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136 return receiver.getRubyClass().lookup(name);
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137 }
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138
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139 }
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140
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141 @ImportStatic(InternalMethod.class)
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142 public abstract static class RubyDispatchNode extends Node {
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143
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144 public abstract Object executeDispatch(VirtualFrame frame, InternalMethod function, Object[] packedArguments);
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145
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146 /*
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147 * Please note that cachedMethod != METHOD_MISSING is invoked once at specialization
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148 * instantiation. It is never executed on the fast path.
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149 */
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150 @Specialization(guards = {"method == cachedMethod", "cachedMethod != METHOD_MISSING"})
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151 protected static Object directCall(VirtualFrame frame, InternalMethod method, Object[] arguments, //
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152 @Cached("method") InternalMethod cachedMethod, //
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153 @Cached("create(cachedMethod.getTarget())") DirectCallNode callNode) {
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154 return callNode.call(frame, arguments);
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155 }
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156
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157 /*
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158 * The method == METHOD_MISSING can fold if the RubyLookup results just in a single entry
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159 * returning the constant METHOD_MISSING.
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160 */
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161 @Specialization(guards = "method == METHOD_MISSING")
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162 protected static Object methodMissing(VirtualFrame frame, InternalMethod method, Object[] arguments) {
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163 // a real implementation would do a call to a method named method_missing here
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164 return RubyObject.NIL;
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165 }
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166
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167 @Specialization(contains = "directCall", guards = "method != METHOD_MISSING")
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168 protected static Object indirectCall(VirtualFrame frame, InternalMethod method, Object[] arguments, //
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169 @Cached("create()") IndirectCallNode callNode) {
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170 return callNode.call(frame, method.getTarget(), arguments);
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171 }
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172
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173 @Override
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174 public String toString() {
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175 return ((SpecializedNode) this).getSpecializationNode().toString();
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176 }
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177 }
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178
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179 public static final class RubyObject {
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180
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181 public static final RubyObject NIL = new RubyObject(null);
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182
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183 private final RubyClass rubyClass;
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184
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185 public RubyObject(RubyClass rubyClass) {
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186 this.rubyClass = rubyClass;
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187 }
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188
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189 public RubyClass getRubyClass() {
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190 return rubyClass;
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191 }
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192
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193 @Override
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194 public String toString() {
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195 return "RubyObject[class=" + rubyClass + "]";
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196 }
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197
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198 }
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199
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200 public static final class RubyClass /* this would extend RubyModule */{
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201
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202 private final String name;
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203 private final RubyClass parent; // this would be a RubyModule
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204 private final CyclicAssumption unmodified;
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205 private final Map<Object, InternalMethod> methods = new HashMap<>();
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206 private Assumption[] cachedDependentAssumptions;
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207 private final int depth;
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208
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209 public RubyClass(String name, RubyClass parent) {
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210 this.name = name;
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211 this.parent = parent;
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212 this.unmodified = new CyclicAssumption("unmodified class " + name);
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213
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214 // lookup depth for array allocation
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215 RubyClass clazz = parent;
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216 int currentDepth = 1;
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217 while (clazz != null) {
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218 currentDepth++;
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219 clazz = clazz.parent;
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220 }
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221 this.depth = currentDepth;
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222 }
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223
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224 @TruffleBoundary
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225 public InternalMethod lookup(Object methodName) {
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226 InternalMethod method = methods.get(methodName);
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227 if (method == null) {
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228 if (parent != null) {
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229 return parent.lookup(methodName);
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230 } else {
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231 return InternalMethod.METHOD_MISSING;
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232 }
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233 } else {
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234 return method;
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235 }
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236 }
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237
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238 @TruffleBoundary
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239 public void addMethod(Object methodName, InternalMethod method) {
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240 // check for existing method omitted for simplicity
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241 this.methods.put(methodName, method);
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242 this.unmodified.invalidate();
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243 }
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244
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245 /*
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246 * Method collects all unmodified assumptions in the class hierarchy. The result is cached
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247 * per class to void recreation per call site.
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248 */
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249 @TruffleBoundary
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250 public Assumption[] getDependentAssumptions() {
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251 Assumption[] dependentAssumptions = cachedDependentAssumptions;
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252 if (dependentAssumptions != null) {
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253 // we can use the cached dependent assumptions only if they are still valid
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254 for (Assumption assumption : cachedDependentAssumptions) {
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255 if (!assumption.isValid()) {
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256 dependentAssumptions = null;
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257 break;
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258 }
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259 }
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260 }
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261 if (dependentAssumptions == null) {
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262 cachedDependentAssumptions = dependentAssumptions = createDependentAssumptions();
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263 }
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264 return dependentAssumptions;
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265 }
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266
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267 @Override
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268 public String toString() {
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269 return "RubyClass[name=" + name + "]";
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270 }
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271
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272 private Assumption[] createDependentAssumptions() {
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273 Assumption[] dependentAssumptions;
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274 RubyClass clazz = this;
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275 dependentAssumptions = new Assumption[depth];
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276
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277 // populate array
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278 int index = 0;
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279 do {
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280 dependentAssumptions[index] = clazz.unmodified.getAssumption();
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281 index++;
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282 clazz = clazz.parent;
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283 } while (clazz != null);
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284 return dependentAssumptions;
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285 }
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286 }
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287
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288 public static final class InternalMethod {
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289
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290 public static final InternalMethod METHOD_MISSING = new InternalMethod(null);
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291
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292 private final CallTarget target;
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293
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294 public InternalMethod(CallTarget target) {
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295 this.target = target;
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296 }
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297
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298 public CallTarget getTarget() {
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299 return target;
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300 }
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301
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302 @Override
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303 public String toString() {
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304 return "InternalMethod[target=" + getTarget() + "]";
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305 }
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306
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307 }
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308
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309 }