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annotate graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/SLMain.java @ 13821:b16ec83edc73

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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
213c1297a814 Simple Language: A simple dynamic programming language to demonstrate Truffle features
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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
213c1297a814 Simple Language: A simple dynamic programming language to demonstrate Truffle features
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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;
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24
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25 import java.io.*;
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26 import java.math.*;
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27
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28 import com.oracle.truffle.api.*;
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29 import com.oracle.truffle.api.dsl.*;
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30 import com.oracle.truffle.api.nodes.*;
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31 import com.oracle.truffle.api.source.*;
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32 import com.oracle.truffle.sl.builtins.*;
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33 import com.oracle.truffle.sl.nodes.*;
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34 import com.oracle.truffle.sl.nodes.call.*;
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35 import com.oracle.truffle.sl.nodes.controlflow.*;
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36 import com.oracle.truffle.sl.nodes.expression.*;
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37 import com.oracle.truffle.sl.nodes.local.*;
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38 import com.oracle.truffle.sl.parser.*;
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39 import com.oracle.truffle.sl.runtime.*;
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40
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41 /**
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42 * SL is a simple language to demonstrate and showcase features of Truffle. The implementation is as
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43 * simple and clean as possible in order to help understanding the ideas and concepts of Truffle.
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44 * The language has first class functions, but no object model.
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45 * <p>
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46 * SL is dynamically typed, i.e., there are no type names specified by the programmer. SL is
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47 * strongly typed, i.e., there is no automatic conversion between types. If an operation is not
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48 * available for the types encountered at run time, a type error is reported and execution is
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49 * stopped. For example, {@code 4 - "2"} results in a type error because subtraction is only defined
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50 * for numbers.
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51 *
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52 * <p>
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53 * <b>Types:</b>
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54 * <ul>
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55 * <li>Number: arbitrary precision integer numbers. The implementation uses the Java primitive type
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56 * {@code long} to represent numbers that fit into the 64 bit range, and {@link BigInteger} for
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57 * numbers that exceed the range. Using a primitive type such as {@code long} is crucial for
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58 * performance.
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59 * <li>Boolean: implemented as the Java primitive type {@code boolean}.
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60 * <li>String: implemented as the Java standard type {@link String}.
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61 * <li>Function: implementation type {@link SLFunction}.
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62 * <li>Null (with only one value {@code null}): implemented as the singleton
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63 * {@link SLNull#SINGLETON}.
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64 * </ul>
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65 * The class {@link SLTypes} lists these types for the Truffle DSL, i.e., for type-specialized
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66 * operations that are specified using Truffle DSL annotations.
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67 *
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68 * <p>
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69 * <b>Language concepts:</b>
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70 * <ul>
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71 * <li>Literals for {@link SLBigIntegerLiteralNode numbers} , {@link SLStringLiteralNode strings},
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72 * and {@link SLFunctionLiteralNode functions}.
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73 * <li>Basic arithmetic, logical, and comparison operations: {@link SLAddNode +}, {@link SLSubNode
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74 * -}, {@link SLMulNode *}, {@link SLDivNode /}, {@link SLLogicalAndNode logical and},
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75 * {@link SLLogicalOrNode logical or}, {@link SLEqualNode ==}, !=, {@link SLLessThanNode <},
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76 * {@link SLLessOrEqualNode <=}, >, >=.
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77 * <li>Local variables: local variables must be defined (via a {@link SLWriteLocalVariableNode
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78 * write}) before they can be used (by a {@link SLReadLocalVariableNode read}). Local variables are
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79 * not visible outside of the block where they were first defined.
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80 * <li>Basic control flow statements: {@link SLBlockNode blocks}, {@link SLIfNode if},
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81 * {@link SLWhileNode while} with {@link SLBreakNode break} and {@link SLContinueNode continue},
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82 * {@link SLReturnNode return}.
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83 * <li>Function calls: {@link SLCallNode calls} are efficiently implemented with
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84 * {@link SLAbstractDispatchNode polymorphic inline caches}.
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85 * </ul>
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86 *
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87 * <p>
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88 * <b>Syntax and parsing:</b><br>
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89 * The syntax is described as an attributed grammar. The {@link Parser} and {@link Scanner} are
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90 * automatically generated by the parser generator Coco/R (available from <a
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91 * href="http://ssw.jku.at/coco/">http://ssw.jku.at/coco/</a>). The grammar contains semantic
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92 * actions that build the AST for a method. To keep these semantic actions short, they are mostly
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93 * calls to the {@link SLNodeFactory} that performs the actual node creation. All functions found in
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94 * the SL source are added to the {@link SLFunctionRegistry}, which is accessible from the
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95 * {@link SLContext}.
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96 *
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97 * <p>
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98 * <b>Builtin functions:</b><br>
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99 * Library functions that are available to every SL source without prior definition are called
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100 * builtin functions. They are added to the {@link SLFunctionRegistry} when the {@link SLContext} is
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101 * created. There current builtin functions are
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102 * <ul>
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103 * <li>{@link SLReadlnBuiltin readln}: Read a String from the {@link SLContext#getInput() standard
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104 * input}.
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105 * <li>{@link SLPrintlnBuiltin println}: Write a value to the {@link SLContext#getOutput() standard
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106 * output}.
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107 * <li>{@link SLNanoTimeBuiltin nanoTime}: Returns the value of a high-resolution time, in
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108 * nanoseconds.
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109 * <li>{@link SLDefineFunctionBuiltin defineFunction}: Parses the functions provided as a String
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110 * argument and adds them to the function registry. Functions that are already defined are replaced
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111 * with the new version.
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112 * </ul>
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113 */
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114 public class SLMain {
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115
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116 /**
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117 * The main entry point. Use the mx command "mx sl" to run it with the correct class path setup.
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118 */
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119 public static void main(String[] args) {
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120 if (args.length == 0) {
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121 throw new SLException("SL source file must be specified as the first argument");
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122 }
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123 String fileName = args[0];
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124 int repeats = 1;
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125 if (args.length >= 2) {
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126 repeats = Integer.parseInt(args[1]);
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127 }
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128
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129 SourceManager sourceManager = new SourceManager();
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130 Source source = sourceManager.get(fileName);
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131 SLContext context = new SLContext(sourceManager, new BufferedReader(new InputStreamReader(System.in)), System.out);
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132 run(context, source, System.out, repeats);
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133 }
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134
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135 /**
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136 * Parse and run the specified SL source. Factored out in a separate method so that it can also
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137 * be used by the unit test harness.
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138 */
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139 public static void run(SLContext context, Source source, PrintStream logOutput, int repeats) {
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140 if (logOutput != null) {
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141 logOutput.println("== running on " + Truffle.getRuntime().getName());
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142 }
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143
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144 /* Parse the SL source file. */
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145 Parser.parseSL(context, source);
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146 /* Lookup our main entry point, which is per definition always named "main". */
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147 SLFunction main = context.getFunctionRegistry().lookup("main");
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148 if (main.getCallTarget() == null) {
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149 throw new SLException("No function main() defined in SL source file.");
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150 }
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151
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152 /* Change to true if you want to see the AST on the console. */
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153 boolean printASTToLog = false;
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154
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155 printScript("before execution", context, logOutput, printASTToLog);
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156 try {
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157 for (int i = 0; i < repeats; i++) {
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158 long start = System.nanoTime();
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159 /* Call the main entry point, without any arguments. */
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160 try {
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161 Object result = main.getCallTarget().call(null, new SLArguments(new Object[0]));
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162 if (result != SLNull.SINGLETON) {
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163 context.getOutput().println(result);
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164 }
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165 } catch (UnsupportedSpecializationException ex) {
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166 context.getOutput().println(formatTypeError(ex));
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167 }
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168 long end = System.nanoTime();
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169
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170 if (logOutput != null && repeats > 1) {
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171 logOutput.println("== iteration " + (i + 1) + ": " + ((end - start) / 1000000) + " ms");
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172 }
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173 }
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174
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175 } finally {
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176 printScript("after execution", context, logOutput, printASTToLog);
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177 }
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178 }
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179
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180 /**
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181 * Dumps the AST of all functions to the IGV visualizer, via a socket connection. IGV can be
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182 * started with the mx command "mx igv". Optionally, also prints the ASTs to the console.
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183 */
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184 private static void printScript(String groupName, SLContext context, PrintStream logOutput, boolean printASTToLog) {
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185 GraphPrintVisitor graphPrinter = new GraphPrintVisitor();
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186 graphPrinter.beginGroup(groupName);
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187 for (SLFunction function : context.getFunctionRegistry().getFunctions()) {
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188 RootCallTarget callTarget = function.getCallTarget();
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189 if (callTarget != null) {
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190 graphPrinter.beginGraph(function.toString()).visit(callTarget.getRootNode());
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191
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192 if (logOutput != null && printASTToLog) {
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193 logOutput.println("=== " + function);
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194 NodeUtil.printTree(logOutput, callTarget.getRootNode());
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195 }
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196 }
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197 }
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198 graphPrinter.printToNetwork(true);
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199 }
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200
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201 /**
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202 * Provides a user-readable message for run-time type errors. SL is strongly typed, i.e., there
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203 * are no automatic type conversions of values. Therefore, Truffle does the type checking for
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204 * us: if no matching node specialization for the actual values is found, then we have a type
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205 * error. Specialized nodes use the {@link UnsupportedSpecializationException} to report that no
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206 * specialization was found. We therefore just have to convert the information encapsulated in
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207 * this exception in a user-readable form.
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208 */
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209 private static String formatTypeError(UnsupportedSpecializationException ex) {
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210 StringBuilder result = new StringBuilder();
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211 result.append("Type error");
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212 if (ex.getNode() != null && ex.getNode().getSourceSection() != null) {
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213 SourceSection ss = ex.getNode().getSourceSection();
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214 result.append(" at ").append(ss.getSource().getName()).append(" line ").append(ss.getStartLine()).append(" col ").append(ss.getStartColumn());
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215 }
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216 result.append(": operation");
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217 if (ex.getNode() != null && ex.getNode().getClass().getAnnotation(NodeInfo.class) != null) {
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218 result.append(" \"").append(ex.getNode().getClass().getAnnotation(NodeInfo.class).shortName()).append("\"");
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219 }
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220 result.append(" not defined for");
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221
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222 String sep = " ";
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223 for (Object value : ex.getSuppliedValues()) {
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224 if (value != null) {
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225 result.append(sep);
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226 sep = ", ";
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227
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228 if (value instanceof Long || value instanceof BigInteger) {
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229 result.append("Number ").append(value);
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230 } else if (value instanceof Boolean) {
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231 result.append("Boolean ").append(value);
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232 } else if (value instanceof String) {
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233 result.append("String \"").append(value).append("\"");
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234 } else if (value instanceof SLFunction) {
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235 result.append("Function ").append(value);
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236 } else if (value == SLNull.SINGLETON) {
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237 result.append("NULL");
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238 } else {
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239 result.append(value);
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240 }
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241 }
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242 }
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243 return result.toString();
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244 }
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245 }