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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/nodes/CallNode.java @ 15089:448338c9ce96

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Truffle: Made inlining context-insensitive again to reduce complexity.
author Christian Humer <christian.humer@gmail.com>
date Mon, 14 Apr 2014 18:25:23 +0200
parents f675818d9ad0
children 07e7aae05983
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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
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30 /**
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31 * Represents a call to a {@link CallTarget} in the Truffle AST. In addition to calling the
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32 * {@link CallTarget}, this {@link Node} enables the runtime system to implement further
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33 * optimizations. Optimizations that can possibly be applied to a {@link CallNode} are inlining and
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34 * splitting. Inlining inlines this call site into the call graph of the parent {@link CallTarget}.
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35 * Splitting duplicates the {@link CallTarget} using {@link RootNode#split()} to collect call site
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36 * sensitive profiling information.
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37 *
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38 * Please note: This class is not intended to be subclassed by guest language implementations.
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39 *
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40 * @see TruffleRuntime#createCallNode(CallTarget)
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41 * @see #forceInlining()
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42 * @see #split()
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43 */
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44 public abstract class CallNode extends Node {
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45
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46 protected final CallTarget callTarget;
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47
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48 protected CallNode(CallTarget callTarget) {
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49 this.callTarget = callTarget;
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50 }
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51
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52 /**
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53 * Calls the inner {@link CallTarget} returned by {@link #getCurrentCallTarget()}.
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54 *
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55 * @param arguments the arguments that should be passed to the callee
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56 * @return the return result of the call
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57 */
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58 public abstract Object call(VirtualFrame frame, Object[] arguments);
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59
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60 /**
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61 * Returns the originally supplied {@link CallTarget} when this call node was created. Please
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62 * note that the returned {@link CallTarget} is not necessarily the {@link CallTarget} that is
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63 * called. For that use {@link #getCurrentCallTarget()} instead.
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64 *
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65 * @return the {@link CallTarget} provided.
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66 */
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67 public CallTarget getCallTarget() {
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68 return callTarget;
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69 }
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70
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71 /**
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72 * Returns <code>true</code> if the underlying runtime system supports inlining for the
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73 * {@link CallTarget} in this {@link CallNode}.
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74 *
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75 * @return true if inlining is supported.
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76 */
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77 public abstract boolean isInlinable();
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78
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79 /**
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80 * Returns <code>true</code> if the {@link CallTarget} is forced to be inlined. A
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81 * {@link CallNode} can either be inlined manually by invoking {@link #forceInlining()} or by
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82 * the runtime system which may at any point decide to inline.
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83 *
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84 * @return true if this method was inlined else false.
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85 */
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86 public abstract boolean isInliningForced();
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87
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88 /**
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89 * Enforces the runtime system to inline the {@link CallTarget} at this call site. If the
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90 * runtime system does not support inlining or it is already inlined this method has no effect.
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91 */
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92 public abstract void forceInlining();
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93
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94 /**
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95 * Returns true if the runtime system has decided to inline this call-site. If the
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96 * {@link CallNode} was forced to inline then this does not necessarily mean that the
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97 * {@link CallNode} is really going to be inlined. This depends on whether or not the runtime
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98 * system supports inlining or not. The runtime system may also decide to ignore calls to
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99 * {@link #forceInlining()}.
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100 */
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101 public abstract boolean isInlined();
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102
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103 /**
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104 * Returns <code>true</code> if this {@link CallNode} can be split. A {@link CallNode} can only
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105 * be split if the runtime system supports splitting and if the {@link RootNode} contained the
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106 * {@link CallTarget} returns <code>true</code> for {@link RootNode#isSplittable()}.
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107 *
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108 * @return <code>true</code> if the target can be split
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109 */
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110 public abstract boolean isSplittable();
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111
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112 /**
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113 * Enforces the runtime system to split the {@link CallTarget}. If the {@link CallNode} is not
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114 * splittable this methods has no effect.
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115 */
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116 public abstract boolean split();
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117
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118 /**
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119 * Returns <code>true</code> if the target of the {@link CallNode} was split.
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120 *
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121 * @return if the target was split
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122 */
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123 public final boolean isSplit() {
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124 return getSplitCallTarget() != null;
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125 }
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126
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127 /**
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128 * Returns the split {@link CallTarget} if this method is split.
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129 *
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130 * @return the split {@link CallTarget}
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131 */
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132 public abstract CallTarget getSplitCallTarget();
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133
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134 /**
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135 * Returns the used call target when {@link #call(VirtualFrame, Object[])} is invoked. If the
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136 * {@link CallTarget} was split this method returns the {@link CallTarget} returned by
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137 * {@link #getSplitCallTarget()}.
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138 *
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139 * @return the used {@link CallTarget} when node is called
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140 */
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141 public CallTarget getCurrentCallTarget() {
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142 CallTarget split = getSplitCallTarget();
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143 if (split != null) {
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144 return split;
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145 } else {
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146 return getCallTarget();
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147 }
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148 }
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149
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150 /**
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151 * Returns the {@link RootNode} associated with {@link CallTarget} returned by
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152 * {@link #getCurrentCallTarget()}. If the stored {@link CallTarget} does not contain a
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153 * {@link RootNode} this method returns <code>null</code>.
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154 *
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155 * @see #getCurrentCallTarget()
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156 * @return the root node of the used call target
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157 */
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158 public final RootNode getCurrentRootNode() {
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159 CallTarget target = getCurrentCallTarget();
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160 if (target instanceof RootCallTarget) {
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161 return ((RootCallTarget) target).getRootNode();
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162 }
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163 return null;
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164 }
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165 }