--- /dev/null	2019-04-25 22:06:38.000000000 +0530
+++ new/src/jdk.jextract/share/classes/com/sun/tools/jextract/InMemoryJavaCompiler.java	2019-04-25 22:06:37.000000000 +0530
@@ -0,0 +1,116 @@
+/*
+ * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package com.sun.tools.jextract;
+
+import javax.tools.FileObject;
+import javax.tools.ForwardingJavaFileManager;
+import javax.tools.JavaCompiler;
+import javax.tools.JavaFileManager;
+import javax.tools.JavaFileObject;
+import javax.tools.SimpleJavaFileObject;
+import javax.tools.ToolProvider;
+import java.io.ByteArrayOutputStream;
+import java.io.StringWriter;
+import java.io.Writer;
+import java.net.URI;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.LinkedList;
+import java.util.Map;
+import java.util.Map.Entry;
+
+final class InMemoryJavaCompiler {
+    private InMemoryJavaCompiler() {}
+
+    static Map<String, byte[]> compile(Map<String, ? extends CharSequence> inputMap,
+            String... options) {
+        Collection<JavaFileObject> sourceFiles = new LinkedList<>();
+        for (Entry<String, ? extends CharSequence> entry : inputMap.entrySet()) {
+            sourceFiles.add(new SourceFile(entry.getKey(), entry.getValue()));
+        }
+
+        JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
+        FileManager fileManager = new FileManager(compiler.getStandardFileManager(null, null, null));
+
+        Writer writer = new StringWriter();
+        Boolean exitCode = compiler.getTask(writer, fileManager, null, Arrays.asList(options), null, sourceFiles).call();
+        if (!exitCode) {
+            throw new RuntimeException("In memory compilation failed: " + writer.toString());
+        }
+        return fileManager.getByteCode();
+    }
+
+    // Wraper for class byte array
+    private static class ClassFile extends SimpleJavaFileObject {
+        private final ByteArrayOutputStream baos = new ByteArrayOutputStream();
+
+        protected ClassFile(String name) {
+            super(URI.create("memo:///" + name.replace('.', '/') + Kind.CLASS.extension), Kind.CLASS);
+        }
+
+        @Override
+        public ByteArrayOutputStream openOutputStream() { return this.baos; }
+
+        byte[] toByteArray() { return baos.toByteArray(); }
+    }
+
+    // File manager which spawns ClassFile instances on demand
+    private static class FileManager extends ForwardingJavaFileManager<JavaFileManager> {
+        private final Map<String, ClassFile> classesMap = new HashMap<>();
+
+        protected FileManager(JavaFileManager fileManager) {
+            super(fileManager);
+        }
+
+        @Override
+        public ClassFile getJavaFileForOutput(Location location, String name, JavaFileObject.Kind kind, FileObject source) {
+            ClassFile classFile = new ClassFile(name);
+            classesMap.put(name, classFile);
+            return classFile;
+        }
+
+        public Map<String, byte[]> getByteCode() {
+            Map<String, byte[]> result = new HashMap<>();
+            for (Entry<String, ClassFile> entry : classesMap.entrySet()) {
+                result.put(entry.getKey(), entry.getValue().toByteArray());
+            }
+            return result;
+        }
+    }
+
+    // Wrapper for source String
+    private static class SourceFile extends SimpleJavaFileObject {
+        private final CharSequence sourceCode;
+
+        public SourceFile(String name, CharSequence sourceCode) {
+            super(URI.create("memo:///" + name.replace('.', '/') + Kind.SOURCE.extension), Kind.SOURCE);
+            this.sourceCode = sourceCode;
+        }
+
+        @Override
+        public CharSequence getCharContent(boolean ignore) {
+            return this.sourceCode;
+        }
+    }
+}