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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/nodes/CallNode.java @ 13804:3840d61e0e68

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author Christian Humer <christian.humer@gmail.com>
date Tue, 28 Jan 2014 12:52:57 +0100
parents e076c87ab175
children 641f22b1c6b8
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1 /*
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2 * Copyright (c) 2012, 2013, 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. Oracle designates this
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8 * particular file as subject to the "Classpath" exception as provided
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9 * by Oracle in the LICENSE file that accompanied this code.
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10 *
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11 * This code is distributed in the hope that it will be useful, but WITHOUT
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 * version 2 for more details (a copy is included in the LICENSE file that
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15 * accompanied this code).
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16 *
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17 * You should have received a copy of the GNU General Public License version
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18 * 2 along with this work; if not, write to the Free Software Foundation,
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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20 *
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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22 * or visit www.oracle.com if you need additional information or have any
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23 * questions.
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24 */
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25 package com.oracle.truffle.api.nodes;
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26
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27 import com.oracle.truffle.api.*;
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28 import com.oracle.truffle.api.frame.*;
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29 import com.oracle.truffle.api.impl.*;
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30
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31 /**
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32 * This node represents a call to a static {@link CallTarget}. This node should be used whenever a
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33 * {@link CallTarget} is considered constant at a certain location in the tree. This enables the
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34 * Truffle runtime to perform inlining or other optimizations for this call-site.
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35 *
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36 * @see #create(CallTarget) to create a CallNode instance.
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37 */
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38 public abstract class CallNode extends Node {
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39
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40 protected final CallTarget callTarget;
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41
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42 private CallNode(CallTarget callTarget) {
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43 this.callTarget = callTarget;
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44 }
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45
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46 /**
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47 * @return the constant {@link CallTarget} that is associated with this {@link CallNode}.
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48 */
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49 public CallTarget getCallTarget() {
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50 return callTarget;
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51 }
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52
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53 /**
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54 * Calls this constant target passing a caller frame and arguments.
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55 *
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56 * @param caller the caller frame
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57 * @param arguments the arguments that should be passed to the callee
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58 * @return the return result of the call
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59 */
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60 public abstract Object call(PackedFrame caller, Arguments arguments);
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61
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62 /**
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63 * Returns <code>true</code> if the {@link CallTarget} contained in this {@link CallNode} can be
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64 * inlined. A {@link CallTarget} is considered inlinable if it was created using
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65 * {@link TruffleRuntime#createCallTarget(RootNode)} and if the enclosed {@link RootNode}
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66 * returns <code>true</code> for {@link RootNode#isInlinable()}.
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67 */
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68 public abstract boolean isInlinable();
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69
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70 /**
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71 * @return true if this {@link CallNode} was already inlined.
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72 */
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73 public abstract boolean isInlined();
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74
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75 /**
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76 * Enforces an inlining optimization on this {@link CallNode} instance. If not performed
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77 * manually the Truffle runtime may perform inlining using an heuristic to optimize the
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78 * performance of the execution. It is recommended to implement an version of
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79 * {@link RootNode#inline()} that adapts the inlining for possible guest language specific
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80 * behavior. If the this {@link CallNode} is not inlinable or is already inlined
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81 * <code>false</code> is returned.
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82 *
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83 * @return <code>true</code> if the inlining operation was successful.
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84 */
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85 public abstract boolean inline();
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86
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87 /**
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88 * Creates a new {@link CallNode} using a {@link CallTarget}.
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89 *
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90 * @param target the {@link CallTarget} to call
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91 * @return a call node that calls the provided target
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92 */
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93 public static CallNode create(CallTarget target) {
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94 if (isInlinable(target)) {
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95 return new InlinableCallNode(target);
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96 } else {
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97 return new DefaultCallNode(target);
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98 }
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99 }
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100
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101 /**
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102 * Warning: this is internal API and may change without notice.
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103 */
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104 public static int internalGetCallCount(CallNode callNode) {
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105 if (callNode.isInlinable() && !callNode.isInlined()) {
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106 return ((InlinableCallNode) callNode).getCallCount();
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107 }
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108 throw new UnsupportedOperationException();
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109 }
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110
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111 /**
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112 * Warning: this is internal API and may change without notice.
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113 */
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114 public static void internalResetCallCount(CallNode callNode) {
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115 if (callNode.isInlinable() && !callNode.isInlined()) {
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116 ((InlinableCallNode) callNode).resetCallCount();
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117 return;
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118 }
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119 throw new UnsupportedOperationException();
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120 }
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121
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122 private static boolean isInlinable(CallTarget callTarget) {
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123 if (callTarget instanceof DefaultCallTarget) {
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124 return (((DefaultCallTarget) callTarget).getRootNode()).isInlinable();
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125 }
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126 return false;
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127 }
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128
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129 static final class DefaultCallNode extends CallNode {
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130
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131 public DefaultCallNode(CallTarget target) {
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132 super(target);
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133 }
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134
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135 @Override
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136 public Object call(PackedFrame caller, Arguments arguments) {
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137 return callTarget.call(caller, arguments);
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138 }
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139
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140 @Override
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141 public boolean inline() {
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142 return false;
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143 }
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144
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145 @Override
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146 public boolean isInlinable() {
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147 return false;
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148 }
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149
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150 @Override
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151 public boolean isInlined() {
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152 return false;
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153 }
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154
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155 }
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156
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157 static final class InlinableCallNode extends CallNode {
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158
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159 private int callCount;
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160
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161 public InlinableCallNode(CallTarget target) {
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162 super(target);
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163 }
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164
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165 @Override
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166 public Object call(PackedFrame parentFrame, Arguments arguments) {
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167 if (CompilerDirectives.inInterpreter()) {
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168 callCount++;
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169 }
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170 return callTarget.call(parentFrame, arguments);
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171 }
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172
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173 @Override
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174 public boolean inline() {
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175 DefaultCallTarget defaultTarget = (DefaultCallTarget) getCallTarget();
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176 RootNode originalRootNode = defaultTarget.getRootNode();
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177 boolean inlined = false;
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178 if (originalRootNode.isInlinable()) {
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179 RootNode inlinedRootNode = defaultTarget.getRootNode().inline();
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180 replace(new InlinedCallNode(defaultTarget, inlinedRootNode));
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181 inlined = true;
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182 }
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183 return inlined;
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184 }
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185
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186 @Override
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187 public boolean isInlined() {
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188 return false;
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189 }
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190
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191 @Override
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192 public boolean isInlinable() {
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193 return true;
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194 }
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195
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196 /* Truffle internal API. */
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197 int getCallCount() {
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198 return callCount;
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199 }
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200
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201 /* Truffle internal API. */
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202 void resetCallCount() {
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203 callCount = 0;
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204 }
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205
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206 }
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207
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208 static final class InlinedCallNode extends CallNode {
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209
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210 private final RootNode inlinedRoot;
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211
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212 public InlinedCallNode(DefaultCallTarget callTarget, RootNode inlinedRoot) {
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213 super(callTarget);
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214 this.inlinedRoot = inlinedRoot;
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215 }
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216
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217 @Override
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218 public Object call(PackedFrame caller, Arguments arguments) {
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219 return inlinedRoot.execute(Truffle.getRuntime().createVirtualFrame(caller, arguments, inlinedRoot.getFrameDescriptor()));
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220 }
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221
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222 @Override
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223 public InlinedCallNode copy() {
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224 return new InlinedCallNode((DefaultCallTarget) getCallTarget(), NodeUtil.cloneNode(inlinedRoot));
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225 }
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226
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227 @Override
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228 public boolean inline() {
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229 return false;
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230 }
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231
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232 @Override
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233 public boolean isInlinable() {
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234 return true;
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235 }
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236
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237 @Override
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238 public boolean isInlined() {
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239 return true;
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240 }
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241
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242 }
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243
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244 }