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annotate truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/TruffleLanguage.java @ 22214:3aad794eec0e

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Truffle/Instrumentation: first large merge of instrumentation code into the TruffleVM framework - introduce the Instrumenter class, held by the TruffleVM to support instrumentation services - reimplement Probe-realated services (formerly statics in Probe.java) to be provided by the Instrumenter- add new Accessors - change the TruffleVM startup sequence - change the APIs of the Debugger and many other classes
author Michael Van De Vanter <michael.van.de.vanter@oracle.com>
date Mon, 14 Sep 2015 22:59:51 -0700
parents c334865b9d42
children d3bdaa91bc82
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1 /*
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2 * Copyright (c) 2014, 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. 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;
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26
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27 import java.io.IOException;
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28 import java.io.Reader;
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29 import java.io.Writer;
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30 import java.lang.annotation.ElementType;
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31 import java.lang.annotation.Retention;
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32 import java.lang.annotation.RetentionPolicy;
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33 import java.lang.annotation.Target;
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34 import java.util.Collections;
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35 import java.util.List;
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36 import java.util.Map;
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37 import java.util.WeakHashMap;
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38
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39 import com.oracle.truffle.api.debug.DebugSupportProvider;
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40 import com.oracle.truffle.api.frame.MaterializedFrame;
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41 import com.oracle.truffle.api.impl.Accessor;
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42 import com.oracle.truffle.api.impl.FindContextNode;
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43 import com.oracle.truffle.api.instrument.ASTProber;
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44 import com.oracle.truffle.api.instrument.AdvancedInstrumentResultListener;
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45 import com.oracle.truffle.api.instrument.AdvancedInstrumentRoot;
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46 import com.oracle.truffle.api.instrument.AdvancedInstrumentRootFactory;
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47 import com.oracle.truffle.api.instrument.Instrument;
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48 import com.oracle.truffle.api.instrument.ToolSupportProvider;
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49 import com.oracle.truffle.api.instrument.Visualizer;
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50 import com.oracle.truffle.api.nodes.Node;
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51 import com.oracle.truffle.api.source.Source;
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52
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53 /**
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54 * An entry point for everyone who wants to implement a Truffle based language. By providing an
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55 * implementation of this type and registering it using {@link Registration} annotation, your
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56 * language becomes accessible to users of the {@link com.oracle.truffle.api.vm.TruffleVM Truffle
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57 * virtual machine} - all they will need to do is to include your JAR into their application and all
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58 * the Truffle goodies (multi-language support, multitenant hosting, debugging, etc.) will be made
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59 * available to them.
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60 *
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61 * @param <C> internal state of the language associated with every thread that is executing program
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62 * {@link #parse(com.oracle.truffle.api.source.Source, com.oracle.truffle.api.nodes.Node, java.lang.String...)
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63 * parsed} by the language
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64 */
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65 @SuppressWarnings("javadoc")
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66 public abstract class TruffleLanguage<C> {
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67 /**
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68 * Constructor to be called by subclasses.
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69 */
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70 protected TruffleLanguage() {
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71 }
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72
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73 /**
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74 * The annotation to use to register your language to the
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75 * {@link com.oracle.truffle.api.vm.TruffleVM Truffle} system. By annotating your implementation
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76 * of {@link TruffleLanguage} by this annotation you are just a
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77 * <em>one JAR drop to the class path</em> away from your users. Once they include your JAR in
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78 * their application, your language will be available to the
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79 * {@link com.oracle.truffle.api.vm.TruffleVM Truffle virtual machine}.
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80 */
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81 @Retention(RetentionPolicy.SOURCE)
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82 @Target(ElementType.TYPE)
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83 public @interface Registration {
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84 /**
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85 * Unique name of your language. This name will be exposed to users via the
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86 * {@link com.oracle.truffle.api.vm.TruffleVM.Language#getName()} getter.
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87 *
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88 * @return identifier of your language
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89 */
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90 String name();
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91
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92 /**
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93 * Unique string identifying the language version. This name will be exposed to users via
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94 * the {@link com.oracle.truffle.api.vm.TruffleVM.Language#getVersion()} getter.
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95 *
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96 * @return version of your language
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97 */
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98 String version();
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99
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100 /**
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101 * List of MIME types associated with your language. Users will use them (directly or
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102 * indirectly) when
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103 * {@link com.oracle.truffle.api.vm.TruffleVM#eval(com.oracle.truffle.api.source.Source)
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104 * executing} their code snippets or their {@link Source files}.
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105 *
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106 * @return array of MIME types assigned to your language files
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107 */
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108 String[] mimeType();
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109 }
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110
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111 /**
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112 * Creates internal representation of the executing context suitable for given environment. Each
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113 * time the {@link TruffleLanguage language} is used by a new
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114 * {@link com.oracle.truffle.api.vm.TruffleVM} or in a new thread, the system calls this method
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115 * to let the {@link TruffleLanguage language} prepare for <em>execution</em>. The returned
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116 * execution context is completely language specific; it is however expected it will contain
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117 * reference to here-in provided <code>env</code> and adjust itself according to parameters
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118 * provided by the <code>env</code> object.
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119 *
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120 * @param env the environment the language is supposed to operate in
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121 * @return internal data of the language in given environment
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122 */
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123 protected abstract C createContext(Env env);
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124
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125 /**
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126 * Parses the provided source and generates appropriate AST. The parsing should execute no user
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127 * code, it should only create the {@link Node} tree to represent the source. The parsing may be
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128 * performed in a context (specified as another {@link Node}) or without context. The
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129 * {@code argumentNames} may contain symbolic names for actual parameters of the call to the
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130 * returned value. The result should be a call target with method
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131 * {@link CallTarget#call(java.lang.Object...)} that accepts as many arguments as were provided
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132 * via the {@code argumentNames} array.
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133 *
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134 * @param code source code to parse
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135 * @param context a {@link Node} defining context for the parsing
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136 * @param argumentNames symbolic names for parameters of
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137 * {@link CallTarget#call(java.lang.Object...)}
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138 * @return a call target to invoke which also keeps in memory the {@link Node} tree representing
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139 * just parsed <code>code</code>
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140 * @throws IOException thrown when I/O or parsing goes wrong. Here-in thrown exception is
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141 * propagate to the user who called one of <code>eval</code> methods of
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142 * {@link com.oracle.truffle.api.vm.TruffleVM}
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143 */
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144 protected abstract CallTarget parse(Source code, Node context, String... argumentNames) throws IOException;
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145
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146 /**
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147 * Called when some other language is seeking for a global symbol. This method is supposed to do
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148 * lazy binding, e.g. there is no need to export symbols in advance, it is fine to wait until
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149 * somebody asks for it (by calling this method).
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150 * <p>
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151 * The exported object can either be <code>TruffleObject</code> (e.g. a native object from the
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152 * other language) to support interoperability between languages, {@link String} or one of Java
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153 * primitive wrappers ( {@link Integer}, {@link Double}, {@link Short}, {@link Boolean}, etc.).
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154 * <p>
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155 * The way a symbol becomes <em>exported</em> is language dependent. In general it is preferred
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156 * to make the export explicit - e.g. call some function or method to register an object under
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157 * specific name. Some languages may however decide to support implicit export of symbols (for
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158 * example from global scope, if they have one). However explicit exports should always be
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159 * preferred. Implicitly exported object of some name should only be used when there is no
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160 * explicit export under such <code>globalName</code>. To ensure so the infrastructure first
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161 * asks all known languages for <code>onlyExplicit</code> symbols and only when none is found,
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162 * it does one more round with <code>onlyExplicit</code> set to <code>false</code>.
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163 *
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164 * @param globalName the name of the global symbol to find
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165 * @param onlyExplicit should the language seek for implicitly exported object or only consider
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166 * the explicitly exported ones?
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167 * @return an exported object or <code>null</code>, if the symbol does not represent anything
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168 * meaningful in this language
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169 */
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170 protected abstract Object findExportedSymbol(C context, String globalName, boolean onlyExplicit);
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171
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172 /**
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173 * Returns global object for the language.
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174 * <p>
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175 * The object is expected to be <code>TruffleObject</code> (e.g. a native object from the other
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176 * language) but technically it can be one of Java primitive wrappers ({@link Integer},
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177 * {@link Double}, {@link Short}, etc.).
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178 *
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179 * @return the global object or <code>null</code> if the language does not support such concept
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180 */
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181 protected abstract Object getLanguageGlobal(C context);
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182
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183 /**
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184 * Checks whether the object is provided by this language.
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185 *
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186 * @param object the object to check
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187 * @return <code>true</code> if this language can deal with such object in native way
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188 */
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189 protected abstract boolean isObjectOfLanguage(Object object);
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190
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191 @Deprecated
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192 protected abstract ToolSupportProvider getToolSupport();
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193
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194 @Deprecated
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195 protected abstract DebugSupportProvider getDebugSupport();
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196
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197 /**
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198 * Gets visualization services for language-specific information.
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199 */
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200 protected abstract Visualizer getVisualizer();
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201
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202 /**
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203 * Enables AST probing on all subsequently created ASTs (sources parsed).
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204 *
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205 * @param astProber optional AST prober to enable; the default for the language used if
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206 * {@code null}
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207 */
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208 @Deprecated
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209 protected abstract void enableASTProbing(ASTProber astProber);
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210
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211 /**
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212 * Gets the current specification for AST instrumentation for the language; <em>empty</em> if
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213 * none.
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214 */
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215 protected abstract List<ASTProber> getASTProbers();
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216
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217 /**
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218 * Runs source code in a halted execution context, or at top level.
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219 *
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220 * @param source the code to run
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221 * @param node node where execution halted, {@code null} if no execution context
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222 * @param mFrame frame where execution halted, {@code null} if no execution context
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223 * @return result of running the code in the context, or at top level if no execution context.
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224 * @throws IOException if the evaluation cannot be performed
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225 */
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226 protected abstract Object evalInContext(Source source, Node node, MaterializedFrame mFrame) throws IOException;
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227
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228 /**
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229 * Creates a language-specific factory to produce instances of {@link AdvancedInstrumentRoot}
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230 * that, when executed, computes the result of a textual expression in the language; used to
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231 * create an
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232 * {@linkplain Instrument#create(AdvancedInstrumentResultListener, AdvancedInstrumentRootFactory, Class, String)
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233 * Advanced Instrument}.
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234 *
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235 * @param expr a guest language expression
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236 * @param resultListener optional listener for the result of each evaluation.
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237 * @return a new factory
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238 * @throws IOException if the factory cannot be created, for example if the expression is badly
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239 * formed.
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240 */
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241 protected abstract AdvancedInstrumentRootFactory createAdvancedInstrumentRootFactory(String expr, AdvancedInstrumentResultListener resultListener) throws IOException;
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242
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243 /**
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244 * Allows a language implementor to create a node that can effectively lookup up the context
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245 * associated with current execution. The context is created by
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246 * {@link #createContext(com.oracle.truffle.api.TruffleLanguage.Env)} method.
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247 *
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248 * @return node to be inserted into program to effectively find out current execution context
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249 * for this language
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250 */
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251 @SuppressWarnings({"rawtypes", "unchecked"})
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252 protected final Node createFindContextNode() {
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253 final Class<? extends TruffleLanguage<?>> c = (Class<? extends TruffleLanguage<?>>) getClass();
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254 return new FindContextNode(c);
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255 }
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256
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257 /**
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258 * Uses the {@link #createFindContextNode()} node to obtain the current context.
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259 *
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260 * @param n the node created by this language's {@link #createFindContextNode()}
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261 * @return the context created by
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262 * {@link #createContext(com.oracle.truffle.api.TruffleLanguage.Env)} method at the
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263 * beginning of the language execution
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264 * @throws ClassCastException if the node has not been created by <code>this</code>.
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265 * {@link #createFindContextNode()} method.
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266 */
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267 @SuppressWarnings({"rawtypes", "unchecked"})
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268 protected final C findContext(Node n) {
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269 FindContextNode fcn = (FindContextNode) n;
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270 if (fcn.getLanguageClass() != getClass()) {
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271 throw new ClassCastException();
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272 }
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273 return (C) fcn.executeFindContext();
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274 }
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275
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276 private static final class LangCtx<C> {
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277 final TruffleLanguage<C> lang;
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278 final C ctx;
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279
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280 public LangCtx(TruffleLanguage<C> lang, Env env) {
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281 this.lang = lang;
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282 // following call verifies that Accessor.CURRENT_VM is provided
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283 assert API.findLanguage(null, null) == null;
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284 this.ctx = lang.createContext(env);
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285 }
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286
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287 Object findExportedSymbol(String globalName, boolean onlyExplicit) {
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288 return lang.findExportedSymbol(ctx, globalName, onlyExplicit);
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289 }
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290
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291 Object getLanguageGlobal() {
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292 return lang.getLanguageGlobal(ctx);
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293 }
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294 }
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295
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296 /**
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297 * Represents execution environment of the {@link TruffleLanguage}. Each active
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298 * {@link TruffleLanguage} receives instance of the environment before any code is executed upon
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299 * it. The environment has knowledge of all active languages and can exchange symbols between
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300 * them.
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301 */
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302 public static final class Env {
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303 private final Object vm;
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304 private final TruffleLanguage<?> lang;
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305 private final LangCtx<?> langCtx;
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306 private final Reader in;
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307 private final Writer err;
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308 private final Writer out;
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309
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310 Env(Object vm, TruffleLanguage<?> lang, Writer out, Writer err, Reader in) {
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311 this.vm = vm;
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312 this.in = in;
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313 this.err = err;
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314 this.out = out;
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315 this.lang = lang;
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316 this.langCtx = new LangCtx<>(lang, this);
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317 }
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318
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319 /**
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320 * Asks the environment to go through other registered languages and find whether they
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321 * export global symbol of specified name. The expected return type is either
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322 * <code>TruffleObject</code>, or one of wrappers of Java primitive types ({@link Integer},
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323 * {@link Double}).
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324 *
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325 * @param globalName the name of the symbol to search for
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326 * @return object representing the symbol or <code>null</code>
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327 */
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328 public Object importSymbol(String globalName) {
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329 return API.importSymbol(vm, lang, globalName);
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330 }
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331
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332 /**
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333 * Input associated with {@link com.oracle.truffle.api.vm.TruffleVM} this language is being
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334 * executed in.
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335 *
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336 * @return reader, never <code>null</code>
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337 */
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338 public Reader stdIn() {
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339 return in;
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340 }
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341
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342 /**
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343 * Standard output writer for {@link com.oracle.truffle.api.vm.TruffleVM} this language is
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344 * being executed in.
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345 *
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346 * @return writer, never <code>null</code>
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347 */
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348 public Writer stdOut() {
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349 return out;
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350 }
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351
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352 /**
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353 * Standard error writer for {@link com.oracle.truffle.api.vm.TruffleVM} this language is
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354 * being executed in.
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355 *
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356 * @return writer, never <code>null</code>
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357 */
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358 public Writer stdErr() {
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359 return err;
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360 }
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361 }
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362
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363 private static final AccessAPI API = new AccessAPI();
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364
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365 @SuppressWarnings("rawtypes")
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366 private static final class AccessAPI extends Accessor {
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367 @Override
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368 protected Env attachEnv(Object vm, TruffleLanguage<?> language, Writer stdOut, Writer stdErr, Reader stdIn) {
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369 Env env = new Env(vm, language, stdOut, stdErr, stdIn);
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370 return env;
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371 }
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372
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373 @Override
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374 protected Object importSymbol(Object vm, TruffleLanguage<?> queryingLang, String globalName) {
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375 return super.importSymbol(vm, queryingLang, globalName);
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376 }
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377
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378 private static final Map<Source, CallTarget> COMPILED = Collections.synchronizedMap(new WeakHashMap<Source, CallTarget>());
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379
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380 @Override
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381 protected Object eval(TruffleLanguage<?> language, Source source) throws IOException {
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382 CallTarget target = COMPILED.get(source);
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383 if (target == null) {
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384 target = language.parse(source, null);
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385 if (target == null) {
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386 throw new IOException("Parsing has not produced a CallTarget for " + source);
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387 }
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388 COMPILED.put(source, target);
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389 }
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390 try {
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391 return target.call();
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392 } catch (Exception ex) {
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393 throw new IOException(ex);
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394 }
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395 }
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396
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397 @Override
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398 protected AdvancedInstrumentRootFactory createAdvancedInstrumentRootFactory(Object vm, Class<? extends TruffleLanguage> languageClass, String expr,
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399 AdvancedInstrumentResultListener resultListener) throws IOException {
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400
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401 final TruffleLanguage language = findLanguageImpl(vm, languageClass);
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402 return language.createAdvancedInstrumentRootFactory(expr, resultListener);
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403 }
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404
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405 @Override
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406 protected Object findExportedSymbol(TruffleLanguage.Env env, String globalName, boolean onlyExplicit) {
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407 return env.langCtx.findExportedSymbol(globalName, onlyExplicit);
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408 }
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409
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410 @Override
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411 protected Env findLanguage(Object vm, Class<? extends TruffleLanguage> languageClass) {
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412 return super.findLanguage(vm, languageClass);
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413 }
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414
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415 @Override
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416 protected TruffleLanguage<?> findLanguage(Env env) {
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417 return env.lang;
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418 }
c2cb9f1c8688 Replacing the langClass.newInstance() hack in Debugger with proper way to obtain the language instance
Jaroslav Tulach <jaroslav.tulach@oracle.com>
parents: 22109
diff changeset
419
c2cb9f1c8688 Replacing the langClass.newInstance() hack in Debugger with proper way to obtain the language instance
Jaroslav Tulach <jaroslav.tulach@oracle.com>
parents: 22109
diff changeset
420 @Override
22066
78c3d3d8d86e Clearly separating the TruffleLanguage definition from context used during its execution. TruffleLanguage now has to have public static field INSTANCE and override createContext method.
Jaroslav Tulach <jaroslav.tulach@oracle.com>
parents: 22049
diff changeset
421 protected Object languageGlobal(TruffleLanguage.Env env) {
78c3d3d8d86e Clearly separating the TruffleLanguage definition from context used during its execution. TruffleLanguage now has to have public static field INSTANCE and override createContext method.
Jaroslav Tulach <jaroslav.tulach@oracle.com>
parents: 22049
diff changeset
422 return env.langCtx.getLanguageGlobal();
21468
99942eac9c6d Introducing TruffleVM - a central place to invoke code in any registered TruffleLanguage.
Jaroslav Tulach <jaroslav.tulach@oracle.com>
parents:
diff changeset
423 }
21890
894f82515e38 Truffle/APIs and Debugging: Evolutionary steps to integrating debugging and tool support with TruffleVM APIs
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents: 21889
diff changeset
424
894f82515e38 Truffle/APIs and Debugging: Evolutionary steps to integrating debugging and tool support with TruffleVM APIs
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents: 21889
diff changeset
425 @Override
22068
fec8f8a61f6c Introducing FindContextNode
Jaroslav Tulach <jaroslav.tulach@oracle.com>
parents: 22066
diff changeset
426 protected Object findContext(Env env) {
fec8f8a61f6c Introducing FindContextNode
Jaroslav Tulach <jaroslav.tulach@oracle.com>
parents: 22066
diff changeset
427 return env.langCtx.ctx;
fec8f8a61f6c Introducing FindContextNode
Jaroslav Tulach <jaroslav.tulach@oracle.com>
parents: 22066
diff changeset
428 }
fec8f8a61f6c Introducing FindContextNode
Jaroslav Tulach <jaroslav.tulach@oracle.com>
parents: 22066
diff changeset
429
fec8f8a61f6c Introducing FindContextNode
Jaroslav Tulach <jaroslav.tulach@oracle.com>
parents: 22066
diff changeset
430 @Override
22214
3aad794eec0e Truffle/Instrumentation: first large merge of instrumentation code into the TruffleVM framework
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents: 22133
diff changeset
431 protected List<ASTProber> getASTProbers(Object vm, Class<? extends TruffleLanguage> languageClass) {
3aad794eec0e Truffle/Instrumentation: first large merge of instrumentation code into the TruffleVM framework
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents: 22133
diff changeset
432 TruffleLanguage impl = findLanguageImpl(vm, languageClass);
3aad794eec0e Truffle/Instrumentation: first large merge of instrumentation code into the TruffleVM framework
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents: 22133
diff changeset
433 return impl.getASTProbers();
3aad794eec0e Truffle/Instrumentation: first large merge of instrumentation code into the TruffleVM framework
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents: 22133
diff changeset
434 }
3aad794eec0e Truffle/Instrumentation: first large merge of instrumentation code into the TruffleVM framework
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents: 22133
diff changeset
435
3aad794eec0e Truffle/Instrumentation: first large merge of instrumentation code into the TruffleVM framework
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents: 22133
diff changeset
436 @SuppressWarnings("deprecation")
3aad794eec0e Truffle/Instrumentation: first large merge of instrumentation code into the TruffleVM framework
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents: 22133
diff changeset
437 @Override
22066
78c3d3d8d86e Clearly separating the TruffleLanguage definition from context used during its execution. TruffleLanguage now has to have public static field INSTANCE and override createContext method.
Jaroslav Tulach <jaroslav.tulach@oracle.com>
parents: 22049
diff changeset
438 protected ToolSupportProvider getToolSupport(TruffleLanguage<?> l) {
21890
894f82515e38 Truffle/APIs and Debugging: Evolutionary steps to integrating debugging and tool support with TruffleVM APIs
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents: 21889
diff changeset
439 return l.getToolSupport();
894f82515e38 Truffle/APIs and Debugging: Evolutionary steps to integrating debugging and tool support with TruffleVM APIs
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents: 21889
diff changeset
440 }
894f82515e38 Truffle/APIs and Debugging: Evolutionary steps to integrating debugging and tool support with TruffleVM APIs
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents: 21889
diff changeset
441
22214
3aad794eec0e Truffle/Instrumentation: first large merge of instrumentation code into the TruffleVM framework
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents: 22133
diff changeset
442 @SuppressWarnings("deprecation")
21890
894f82515e38 Truffle/APIs and Debugging: Evolutionary steps to integrating debugging and tool support with TruffleVM APIs
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents: 21889
diff changeset
443 @Override
22066
78c3d3d8d86e Clearly separating the TruffleLanguage definition from context used during its execution. TruffleLanguage now has to have public static field INSTANCE and override createContext method.
Jaroslav Tulach <jaroslav.tulach@oracle.com>
parents: 22049
diff changeset
444 protected DebugSupportProvider getDebugSupport(TruffleLanguage<?> l) {
21890
894f82515e38 Truffle/APIs and Debugging: Evolutionary steps to integrating debugging and tool support with TruffleVM APIs
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents: 21889
diff changeset
445 return l.getDebugSupport();
894f82515e38 Truffle/APIs and Debugging: Evolutionary steps to integrating debugging and tool support with TruffleVM APIs
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents: 21889
diff changeset
446 }
21468
99942eac9c6d Introducing TruffleVM - a central place to invoke code in any registered TruffleLanguage.
Jaroslav Tulach <jaroslav.tulach@oracle.com>
parents:
diff changeset
447 }
21890
894f82515e38 Truffle/APIs and Debugging: Evolutionary steps to integrating debugging and tool support with TruffleVM APIs
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents: 21889
diff changeset
448
21468
99942eac9c6d Introducing TruffleVM - a central place to invoke code in any registered TruffleLanguage.
Jaroslav Tulach <jaroslav.tulach@oracle.com>
parents:
diff changeset
449 }