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annotate src/luan/impl/Compiled.java @ 1563:8fbcc4747091

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remove LuanFunction.luan
author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 09 Nov 2020 01:37:57 -0700
parents b89212fd04b5
children 2975c932864d
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1 package luan.impl;
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2
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3 import java.io.OutputStream;
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4 import java.io.BufferedOutputStream;
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5 import java.io.ByteArrayOutputStream;
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6 import java.io.StringWriter;
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7 import java.io.File;
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8 import java.io.FileInputStream;
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9 import java.io.FileOutputStream;
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10 import java.io.IOException;
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11 import java.net.URI;
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12 import java.util.Collections;
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13 import java.util.Map;
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14 import java.util.HashMap;
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15 import java.util.Set;
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16 import java.util.HashSet;
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17 import javax.tools.FileObject;
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18 import javax.tools.JavaFileObject;
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19 import javax.tools.SimpleJavaFileObject;
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20 import javax.tools.JavaCompiler;
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21 import javax.tools.ToolProvider;
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22 import javax.tools.JavaFileManager;
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23 import javax.tools.StandardJavaFileManager;
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24 import javax.tools.ForwardingJavaFileManager;
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25 import goodjava.io.BufferedInputStream;
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26 import goodjava.io.DataInputStream;
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27 import goodjava.io.DataOutputStream;
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28 import goodjava.logging.Logger;
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29 import goodjava.logging.LoggerFactory;
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30
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31
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32 final class Compiled {
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33 private static final Logger logger = LoggerFactory.getLogger(Compiled.class);
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34
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35 private static class MyJavaFileObject extends SimpleJavaFileObject {
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36 final ByteArrayOutputStream baos = new ByteArrayOutputStream();
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37
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38 MyJavaFileObject() {
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39 super(URI.create("whatever"),JavaFileObject.Kind.CLASS);
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40 }
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41
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42 @Override public OutputStream openOutputStream() {
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43 return baos;
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44 }
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45
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46 byte[] byteCode(String sourceName) {
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47 byte[] byteCode = baos.toByteArray();
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48 final int len = sourceName.length();
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49 int max = byteCode.length-len-3;
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50 outer:
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51 for( int i=0; true; i++ ) {
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52 if( i > max )
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53 throw new RuntimeException("len="+len);
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54 if( byteCode[i]==1 && (byteCode[i+1] << 8 | 0xFF & byteCode[i+2]) == len ) {
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55 for( int j=i+3; j<i+3+len; j++ ) {
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56 if( byteCode[j] != '$' )
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57 continue outer;
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58 }
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59 System.arraycopy(sourceName.getBytes(),0,byteCode,i+3,len);
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60 break;
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61 }
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62 }
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63 return byteCode;
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64 }
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65 }
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66
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67 static Compiled compile(final String className,final String sourceName,final String code) {
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68 final int len = sourceName.length();
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69 StringBuilder sb = new StringBuilder(sourceName);
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70 for( int i=0; i<len; i++ )
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71 sb.setCharAt(i,'$');
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72 JavaFileObject sourceFile = new SimpleJavaFileObject(URI.create(sb.toString()),JavaFileObject.Kind.SOURCE) {
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73 @Override public CharSequence getCharContent(boolean ignoreEncodingErrors) {
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74 return code;
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75 }
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76 @Override public String getName() {
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77 return sourceName;
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78 }
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79 @Override public boolean isNameCompatible(String simpleName,JavaFileObject.Kind kind) {
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80 return true;
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81 }
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82 };
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83 final Map<String,MyJavaFileObject> map = new HashMap<String,MyJavaFileObject>();
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84 JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
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85 StandardJavaFileManager sjfm = compiler.getStandardFileManager(null,null,null);
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86 ForwardingJavaFileManager fjfm = new ForwardingJavaFileManager(sjfm) {
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87 @Override public JavaFileObject getJavaFileForOutput(JavaFileManager.Location location, String className, JavaFileObject.Kind kind, FileObject sibling) throws IOException {
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88 if( map.containsKey(className) )
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89 throw new RuntimeException(className);
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90 MyJavaFileObject classFile = new MyJavaFileObject();
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91 map.put(className,classFile);
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92 return classFile;
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93 }
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94 };
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95 StringWriter out = new StringWriter();
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96 boolean b = compiler.getTask(out, fjfm, null, null, null, Collections.singletonList(sourceFile)).call();
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97 if( !b )
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98 throw new RuntimeException("\n"+out+"\ncode:\n"+code+"\n");
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99 Map<String,byte[]> map2 = new HashMap<String,byte[]>();
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100 for( Map.Entry<String,MyJavaFileObject> entry : map.entrySet() ) {
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101 map2.put( entry.getKey(), entry.getValue().byteCode(sourceName) );
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102 }
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103 return new Compiled(className,map2);
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104 }
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105
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106
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107 private final String className;
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108 private final Map<String,byte[]> map;
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109 private final Set<String> set = new HashSet<String>();
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110
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111 private Compiled(String className,Map<String,byte[]> map) {
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112 this.className = className;
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113 this.map = map;
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114 }
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115
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116 Class loadClass() {
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117 try {
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118 ClassLoader cl = new ClassLoader() {
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119 @Override protected Class<?> findClass(String name) throws ClassNotFoundException {
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120 if( !set.add(name) )
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121 logger.error("dup "+name);
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122 byte[] byteCode = map.get(name);
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123 if( byteCode != null ) {
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124 return defineClass(name, byteCode, 0, byteCode.length);
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125 }
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126 return super.findClass(name);
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127 }
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128 };
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129 return cl.loadClass(className);
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130 } catch(ClassNotFoundException e) {
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131 throw new RuntimeException(e);
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132 }
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133 }
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134
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135
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136 private static final int VERSION = 6;
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137 private static final File tmpDir;
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138 static {
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139 File f = new File(System.getProperty("java.io.tmpdir"));
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140 tmpDir = new File(f,"luan");
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141 tmpDir.mkdir();
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142 if( !tmpDir.exists() )
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143 throw new RuntimeException();
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144 }
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145
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146 static Compiled load(String fileName,String key) {
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147 try {
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148 File f = new File(tmpDir,fileName);
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149 if( !f.exists() )
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150 return null;
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151 DataInputStream in = new DataInputStream(new BufferedInputStream(new FileInputStream(f)));
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152 if( in.readInt() != VERSION )
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153 return null;
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154 if( !in.readString().equals(key) )
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155 return null;
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156 String className = in.readUTF();
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157 int n = in.readInt();
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158 Map<String,byte[]> map = new HashMap<String,byte[]>();
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159 for( int i=0; i<n; i++ ) {
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160 String s = in.readUTF();
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161 int len = in.readInt();
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162 byte[] a = new byte[len];
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163 in.readFully(a);
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164 map.put(s,a);
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165 }
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166 in.close();
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167 return new Compiled(className,map);
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168 } catch(IOException e) {
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169 logger.error("load failed",e);
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170 return null;
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171 }
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172 }
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173
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174 void save(String fileName,String key) {
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175 try {
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176 File f = new File(tmpDir,fileName);
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177 DataOutputStream out = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(f)));
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178 out.writeInt(VERSION);
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179 out.writeString(key);
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180 out.writeUTF(className);
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181 out.writeInt(map.size());
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182 for( Map.Entry<String,byte[]> entry : map.entrySet() ) {
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183 out.writeUTF( entry.getKey() );
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184 byte[] a = entry.getValue();
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185 out.writeInt(a.length);
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186 out.write(a);
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187 }
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188 out.close();
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189 } catch(IOException e) {
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190 logger.error("save failed",e);
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191 }
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192 }
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193 }