Mercurial > hg > graal-compiler
annotate graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/runtime/SLContext.java @ 21615:838f005f9aec
handle service filtering that returns an empty result
author | Doug Simon <doug.simon@oracle.com> |
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date | Sun, 31 May 2015 14:30:13 +0200 |
parents | 3286fb5fea4a |
children | 894f82515e38 |
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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 * 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.sl.runtime; |
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24 |
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25 import java.io.*; |
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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.dsl.*; |
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29 import com.oracle.truffle.api.frame.*; |
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30 import com.oracle.truffle.api.nodes.*; |
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31 import com.oracle.truffle.api.object.*; |
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32 import com.oracle.truffle.api.source.*; |
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33 import com.oracle.truffle.sl.builtins.*; |
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34 import com.oracle.truffle.sl.nodes.*; |
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35 import com.oracle.truffle.sl.nodes.local.*; |
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36 import com.oracle.truffle.sl.parser.*; |
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37 |
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38 /** |
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39 * The run-time state of SL during execution. One context is instantiated before any source code is |
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40 * parsed, and this context is passed around to all methods that need access to it. For example, the |
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41 * context is used during {@link SLNodeFactory parsing} and by {@link SLBuiltinNode#getContext() |
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42 * builtin functions}. |
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43 * <p> |
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44 * It would be an error to have two different context instances during the execution of one script. |
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45 * However, if two separate scripts run in one Java VM at the same time, they have a different |
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46 * context. Therefore, the context is not a singleton. |
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47 */ |
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48 public final class SLContext extends ExecutionContext { |
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49 private static final Layout LAYOUT = Layout.createLayout(); |
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50 |
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51 private final BufferedReader input; |
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52 private final PrintWriter output; |
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53 private final SLFunctionRegistry functionRegistry; |
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54 private final Shape emptyShape; |
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55 |
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56 public SLContext(BufferedReader input, PrintWriter output) { |
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57 this.input = input; |
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58 this.output = output; |
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59 this.functionRegistry = new SLFunctionRegistry(); |
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60 installBuiltins(); |
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61 |
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62 this.emptyShape = LAYOUT.createShape(new ObjectType()); |
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63 } |
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64 |
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65 @Override |
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66 public String getLanguageShortName() { |
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67 return "Simple"; |
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68 } |
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69 |
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70 /** |
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71 * Returns the default input, i.e., the source for the {@link SLReadlnBuiltin}. To allow unit |
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72 * testing, we do not use {@link System#in} directly. |
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73 */ |
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74 public BufferedReader getInput() { |
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75 return input; |
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76 } |
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77 |
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78 /** |
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79 * The default default, i.e., the output for the {@link SLPrintlnBuiltin}. To allow unit |
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80 * testing, we do not use {@link System#out} directly. |
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81 */ |
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82 public PrintWriter getOutput() { |
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83 return output; |
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84 } |
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85 |
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86 /** |
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87 * Returns the registry of all functions that are currently defined. |
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88 */ |
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89 public SLFunctionRegistry getFunctionRegistry() { |
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90 return functionRegistry; |
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91 } |
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92 |
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93 /** |
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94 * Adds all builtin functions to the {@link SLFunctionRegistry}. This method lists all |
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95 * {@link SLBuiltinNode builtin implementation classes}. |
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96 */ |
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97 private void installBuiltins() { |
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98 installBuiltin(SLReadlnBuiltinFactory.getInstance()); |
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99 installBuiltin(SLPrintlnBuiltinFactory.getInstance()); |
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100 installBuiltin(SLNanoTimeBuiltinFactory.getInstance()); |
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101 installBuiltin(SLDefineFunctionBuiltinFactory.getInstance()); |
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102 installBuiltin(SLStackTraceBuiltinFactory.getInstance()); |
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103 installBuiltin(SLHelloEqualsWorldBuiltinFactory.getInstance()); |
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104 installBuiltin(SLAssertTrueBuiltinFactory.getInstance()); |
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105 installBuiltin(SLAssertFalseBuiltinFactory.getInstance()); |
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106 installBuiltin(SLNewObjectBuiltinFactory.getInstance()); |
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107 } |
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108 |
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109 public void installBuiltin(NodeFactory<? extends SLBuiltinNode> factory) { |
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110 /* |
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111 * The builtin node factory is a class that is automatically generated by the Truffle DSL. |
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112 * The signature returned by the factory reflects the signature of the @Specialization |
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113 * methods in the builtin classes. |
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114 */ |
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115 int argumentCount = factory.getExecutionSignature().size(); |
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116 SLExpressionNode[] argumentNodes = new SLExpressionNode[argumentCount]; |
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117 /* |
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118 * Builtin functions are like normal functions, i.e., the arguments are passed in as an |
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119 * Object[] array encapsulated in SLArguments. A SLReadArgumentNode extracts a parameter |
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120 * from this array. |
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121 */ |
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122 for (int i = 0; i < argumentCount; i++) { |
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123 argumentNodes[i] = new SLReadArgumentNode(null, i); |
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124 } |
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125 /* Instantiate the builtin node. This node performs the actual functionality. */ |
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126 SLBuiltinNode builtinBodyNode = factory.createNode(argumentNodes, this); |
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127 /* The name of the builtin function is specified via an annotation on the node class. */ |
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128 String name = lookupNodeInfo(builtinBodyNode.getClass()).shortName(); |
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129 /* Wrap the builtin in a RootNode. Truffle requires all AST to start with a RootNode. */ |
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130 SLRootNode rootNode = new SLRootNode(this, new FrameDescriptor(), builtinBodyNode, name); |
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131 |
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132 /* Register the builtin function in our function registry. */ |
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133 getFunctionRegistry().register(name, rootNode); |
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134 } |
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135 |
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136 public static NodeInfo lookupNodeInfo(Class<?> clazz) { |
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137 if (clazz == null) { |
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138 return null; |
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139 } |
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140 NodeInfo info = clazz.getAnnotation(NodeInfo.class); |
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141 if (info != null) { |
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142 return info; |
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143 } else { |
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144 return lookupNodeInfo(clazz.getSuperclass()); |
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145 } |
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146 } |
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147 |
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148 /** |
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149 * This function will parse the given source code, parse the code using the {@link Parser}, and |
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150 * then execute the function named main. To use this method with instrumentation, |
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151 * setASTNodeProber must have been already called. There is currently no guard to check if this |
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152 * is the case. <br/> |
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153 * Due to the experimental nature of the instrumentation framework, the parse that happens in |
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154 * this method will remove any previously added instrumentation. |
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155 * |
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156 * @param source The {@link Source} to execute. |
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157 */ |
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158 public void executeMain(Source source) { |
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159 Parser.parseSL(this, source); |
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160 } |
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161 |
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162 public DynamicObject createObject() { |
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163 return LAYOUT.newInstance(emptyShape); |
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164 } |
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165 |
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166 public static boolean isSLObject(Object value) { |
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167 return LAYOUT.getType().isInstance(value); |
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168 } |
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169 |
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170 public static DynamicObject castSLObject(Object value) { |
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171 return LAYOUT.getType().cast(value); |
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172 } |
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173 } |