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Documentation and more refactoring of Simple Language
author Christian Wimmer <christian.wimmer@oracle.com>
date Wed, 29 Jan 2014 20:45:43 -0800
parents 7c418666c6c9
children 64c77f0577bb
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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.dsl.*;
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28 import com.oracle.truffle.api.frame.*;
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29 import com.oracle.truffle.api.nodes.*;
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30 import com.oracle.truffle.api.source.*;
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31 import com.oracle.truffle.sl.builtins.*;
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32 import com.oracle.truffle.sl.nodes.*;
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33 import com.oracle.truffle.sl.nodes.local.*;
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34 import com.oracle.truffle.sl.parser.*;
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35
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36 /**
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37 * The run-time state of SL during execution. One context is instantiated before any source code is
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38 * parsed, and this context is passed around to all methods that need access to it. For example, the
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39 * context is used during {@link SLNodeFactory parsing} and by {@link SLBuiltinNode#getContext()
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40 * builtin functions}.
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41 * <p>
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42 * It would be an error to have two different context instances at the same. From a software
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43 * engineering point of view, it is better to pass around this encapsulated context object instead
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44 * of storing the data in static Java fields.
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45 */
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46 public final class SLContext {
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47 private final SourceManager sourceManager;
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48 private final BufferedReader input;
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49 private final PrintStream output;
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50 private final SLFunctionRegistry functionRegistry;
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51
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52 public SLContext(SourceManager sourceManager, BufferedReader input, PrintStream output) {
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53 this.sourceManager = sourceManager;
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54 this.input = input;
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55 this.output = output;
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56 this.functionRegistry = new SLFunctionRegistry();
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57
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58 installBuiltins();
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59 }
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60
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61 /**
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62 * Returns the source manger that controls all SL source code that is executed.
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63 */
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64 public SourceManager getSourceManager() {
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65 return sourceManager;
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66 }
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67
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68 /**
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69 * Returns the default input, i.e., the source for the {@link SLReadlnBuiltin}. To allow unit
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70 * testing, we do not use {@link System#in} directly.
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71 */
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72 public BufferedReader getInput() {
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73 return input;
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74 }
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75
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76 /**
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77 * The default default, i.e., the output for the {@link SLPrintlnBuiltin}. To allow unit
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78 * testing, we do not use {@link System#out} directly.
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79 */
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80 public PrintStream getOutput() {
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81 return output;
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82 }
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83
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84 /**
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85 * Returns the registry of all functions that are currently defined.
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86 */
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87 public SLFunctionRegistry getFunctionRegistry() {
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88 return functionRegistry;
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89 }
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90
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91 /**
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92 * Adds all builitin functions to the {@link SLFunctionRegistry}. This method lists all
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93 * {@link SLBuiltinNode builtin implementation classes}.
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94 */
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95 private void installBuiltins() {
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96 installBuiltin(SLReadlnBuiltinFactory.getInstance());
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97 installBuiltin(SLPrintlnBuiltinFactory.getInstance());
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98 installBuiltin(SLNanoTimeBuiltinFactory.getInstance());
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99 installBuiltin(SLDefineFunctionBuiltinFactory.getInstance());
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100 }
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101
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102 private void installBuiltin(NodeFactory<? extends SLBuiltinNode> factory) {
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103 /*
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104 * The builtin node factory is a class that is automatically generated by the Truffle DSL.
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105 * The signature returned by the factory reflects the signature of the @Specialization
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106 * methods in the builtin classes.
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107 */
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108 int argumentCount = factory.getExecutionSignature().size();
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109 SLExpressionNode[] argumentNodes = new SLExpressionNode[argumentCount];
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110 /*
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111 * Builtin functions are like normal functions, i.e., the arguments are passed in as an
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112 * Object[] array encapsulated in SLArguments. A SLReadArgumentNode extracts a parameter
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113 * from this array.
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114 */
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115 for (int i = 0; i < argumentCount; i++) {
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116 argumentNodes[i] = new SLReadArgumentNode(i);
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117 }
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118 /* Instantiate the builtin node. This node performs the actual functionality. */
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119 SLBuiltinNode builtinBodyNode = factory.createNode(argumentNodes, this);
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120 /* The name of the builtin function is specified via an annotation on the node class. */
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121 String name = builtinBodyNode.getClass().getAnnotation(NodeInfo.class).shortName();
b16ec83edc73 Documentation and more refactoring of Simple Language
Christian Wimmer <christian.wimmer@oracle.com>
parents: 13761
diff changeset
122 /* Wrap the builtin in a RootNode. Truffle requires all AST to start with a RootNode. */
b16ec83edc73 Documentation and more refactoring of Simple Language
Christian Wimmer <christian.wimmer@oracle.com>
parents: 13761
diff changeset
123 SLRootNode rootNode = new SLRootNode(new FrameDescriptor(), builtinBodyNode, name);
b16ec83edc73 Documentation and more refactoring of Simple Language
Christian Wimmer <christian.wimmer@oracle.com>
parents: 13761
diff changeset
124
b16ec83edc73 Documentation and more refactoring of Simple Language
Christian Wimmer <christian.wimmer@oracle.com>
parents: 13761
diff changeset
125 /* Register the builtin function in our function registry. */
b16ec83edc73 Documentation and more refactoring of Simple Language
Christian Wimmer <christian.wimmer@oracle.com>
parents: 13761
diff changeset
126 getFunctionRegistry().register(name, rootNode);
13761
7c418666c6c9 Refactoring and cleanup of Simple Language (more to come soon)
Christian Wimmer <christian.wimmer@oracle.com>
parents: 13455
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127 }
12752
71991b7a0f14 SL: Enhanced SimpleLanguage with support for if statements, function calls, function caching + inlining and builtins.
Christian Humer <christian.humer@gmail.com>
parents:
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128 }