1 /* 2 * Copyright (c) 2013, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 package vm.share; 24 25 import javax.tools.FileObject; 26 import javax.tools.ForwardingJavaFileManager; 27 import javax.tools.JavaCompiler; 28 import javax.tools.JavaFileManager; 29 import javax.tools.JavaFileObject; 30 import javax.tools.SimpleJavaFileObject; 31 import javax.tools.ToolProvider; 32 import java.io.ByteArrayOutputStream; 33 import java.io.StringWriter; 34 import java.io.Writer; 35 import java.net.URI; 36 import java.util.Collection; 37 import java.util.HashMap; 38 import java.util.LinkedList; 39 import java.util.Map; 40 import java.util.Map.Entry; 41 42 43 public class InMemoryJavaCompiler { 44 compile(Map<String, ? extends CharSequence> inputMap)45 public static Map<String, byte[]> compile(Map<String, ? extends CharSequence> inputMap) { 46 Collection<JavaFileObject> sourceFiles = new LinkedList<JavaFileObject>(); 47 for (Entry<String, ? extends CharSequence> entry : inputMap.entrySet()) { 48 sourceFiles.add(new SourceFile(entry.getKey(), entry.getValue())); 49 } 50 51 JavaCompiler compiler = ToolProvider.getSystemJavaCompiler(); 52 FileManager fileManager = new FileManager(compiler.getStandardFileManager(null, null, null)); 53 54 Writer writer = new StringWriter(); 55 Boolean exitCode = compiler.getTask(writer, fileManager, null, null, null, sourceFiles).call(); 56 if (!exitCode) { 57 System.out.println("*********** javac output begin ***********"); 58 System.out.println(writer.toString()); 59 System.out.println("*********** javac output end ***********"); 60 if (writer.toString().contains("java.lang.OutOfMemoryError")) { 61 System.out.println("Got OOME while performing in memory compilation. It happens on weak hosts and there is nothing we can do. "); 62 throw new OutOfMemoryError("Got OOME while performing in memory compilation."); 63 } 64 throw new RuntimeException("Test bug: in memory compilation failed."); 65 } 66 return fileManager.getByteCode(); 67 } 68 69 // Wraper for class file 70 static class ClassFile extends SimpleJavaFileObject { 71 72 private final ByteArrayOutputStream baos = new ByteArrayOutputStream(); 73 ClassFile(String name)74 protected ClassFile(String name) { 75 super(URI.create("memo:///" + name.replace('.', '/') + Kind.CLASS.extension), Kind.CLASS); 76 } 77 78 @Override openOutputStream()79 public ByteArrayOutputStream openOutputStream() { return this.baos; } 80 toByteArray()81 byte[] toByteArray() { return baos.toByteArray(); } 82 } 83 84 // File manager which spawns ClassFile instances by demand 85 static class FileManager extends ForwardingJavaFileManager<JavaFileManager> { 86 87 private Map<String, ClassFile> classesMap = new HashMap<String, ClassFile>(); 88 FileManager(JavaFileManager fileManager)89 protected FileManager(JavaFileManager fileManager) { 90 super(fileManager); 91 } 92 93 @Override getJavaFileForOutput(Location location, String name, JavaFileObject.Kind kind, FileObject source)94 public ClassFile getJavaFileForOutput(Location location, String name, JavaFileObject.Kind kind, FileObject source) { 95 ClassFile classFile = new ClassFile(name); 96 classesMap.put(name, classFile); 97 return classFile; 98 } 99 getByteCode()100 public Map<String, byte[]> getByteCode() { 101 Map<String, byte[]> result = new HashMap<String, byte[]>(); 102 for (Entry<String, ClassFile> entry : classesMap.entrySet()) { 103 result.put(entry.getKey(), entry.getValue().toByteArray()); 104 } 105 return result; 106 } 107 } 108 109 // Wrapper for source file 110 static class SourceFile extends SimpleJavaFileObject { 111 112 private CharSequence sourceCode; 113 SourceFile(String name, CharSequence sourceCode)114 public SourceFile(String name, CharSequence sourceCode) { 115 super(URI.create("memo:///" + name.replace('.', '/') + Kind.SOURCE.extension), Kind.SOURCE); 116 this.sourceCode = sourceCode; 117 } 118 119 @Override getCharContent(boolean ignore)120 public CharSequence getCharContent(boolean ignore) { 121 return this.sourceCode; 122 } 123 } 124 125 } 126