--- /dev/null 2019-02-07 20:54:51.336000000 +0300
+++ new/test/lib/jdk/test/lib/compiler/InMemoryJavaCompiler.java 2019-02-08 18:34:02.855138572 +0300
@@ -0,0 +1,200 @@
+/*
+ * Copyright (c) 2013, 2017, 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 jdk.test.lib.compiler;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+
+import java.net.URI;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import javax.tools.ForwardingJavaFileManager;
+import javax.tools.FileObject;
+import javax.tools.JavaCompiler;
+import javax.tools.JavaCompiler.CompilationTask;
+import javax.tools.JavaFileObject;
+import javax.tools.JavaFileObject.Kind;
+import javax.tools.SimpleJavaFileObject;
+import javax.tools.StandardLocation;
+import javax.tools.ToolProvider;
+
+/**
+ * {@code InMemoryJavaCompiler} can be used for compiling a {@link
+ * CharSequence} to a {@code byte[]}.
+ *
+ * The compiler will not use the file system at all, instead using a {@link
+ * ByteArrayOutputStream} for storing the byte code. For the source code, any
+ * kind of {@link CharSequence} can be used, e.g. {@link String}, {@link
+ * StringBuffer} or {@link StringBuilder}.
+ *
+ * The {@code InMemoryCompiler} can easily be used together with a {@code
+ * ByteClassLoader} to easily compile and load source code in a {@link String}:
+ *
+ *
+ * {@code
+ * import jdk.test.lib.compiler.InMemoryJavaCompiler;
+ * import jdk.test.lib.ByteClassLoader;
+ *
+ * class Example {
+ * public static void main(String[] args) {
+ * String className = "Foo";
+ * String sourceCode = "public class " + className + " {" +
+ * " public void bar() {" +
+ * " System.out.println("Hello from bar!");" +
+ * " }" +
+ * "}";
+ * byte[] byteCode = InMemoryJavaCompiler.compile(className, sourceCode);
+ * Class fooClass = ByteClassLoader.load(className, byteCode);
+ * }
+ * }
+ * }
+ *
+ */
+public class InMemoryJavaCompiler {
+ private static class MemoryJavaFileObject extends SimpleJavaFileObject {
+ private final String className;
+ private final CharSequence sourceCode;
+ private final ByteArrayOutputStream byteCode;
+
+ public MemoryJavaFileObject(String className, CharSequence sourceCode) {
+ super(URI.create("string:///" + className.replace('.','/') + Kind.SOURCE.extension), Kind.SOURCE);
+ this.className = className;
+ this.sourceCode = sourceCode;
+ this.byteCode = new ByteArrayOutputStream();
+ }
+
+ @Override
+ public CharSequence getCharContent(boolean ignoreEncodingErrors) {
+ return sourceCode;
+ }
+
+ @Override
+ public OutputStream openOutputStream() throws IOException {
+ return byteCode;
+ }
+
+ public byte[] getByteCode() {
+ return byteCode.toByteArray();
+ }
+
+ public String getClassName() {
+ return className;
+ }
+ }
+
+ private static class FileManagerWrapper extends ForwardingJavaFileManager {
+ private static final Location PATCH_LOCATION = new Location() {
+ @Override
+ public String getName() {
+ return "patch module location";
+ }
+
+ @Override
+ public boolean isOutputLocation() {
+ return false;
+ }
+ };
+ private final MemoryJavaFileObject file;
+ private final String moduleOverride;
+
+ public FileManagerWrapper(MemoryJavaFileObject file, String moduleOverride) {
+ super(getCompiler().getStandardFileManager(null, null, null));
+ this.file = file;
+ this.moduleOverride = moduleOverride;
+ }
+
+ @Override
+ public JavaFileObject getJavaFileForOutput(Location location, String className,
+ Kind kind, FileObject sibling)
+ throws IOException {
+ if (!file.getClassName().equals(className)) {
+ throw new IOException("Expected class with name " + file.getClassName() +
+ ", but got " + className);
+ }
+ return file;
+ }
+
+ @Override
+ public Location getLocationForModule(Location location, JavaFileObject fo) throws IOException {
+ if (fo == file && moduleOverride != null) {
+ return PATCH_LOCATION;
+ }
+ return super.getLocationForModule(location, fo);
+ }
+
+ @Override
+ public String inferModuleName(Location location) throws IOException {
+ if (location == PATCH_LOCATION) {
+ return moduleOverride;
+ }
+ return super.inferModuleName(location);
+ }
+
+ @Override
+ public boolean hasLocation(Location location) {
+ return super.hasLocation(location) || location == StandardLocation.PATCH_MODULE_PATH;
+ }
+
+ }
+
+ /**
+ * Compiles the class with the given name and source code.
+ *
+ * @param className The name of the class
+ * @param sourceCode The source code for the class with name {@code className}
+ * @param options additional command line options
+ * @throws RuntimeException if the compilation did not succeed
+ * @return The resulting byte code from the compilation
+ */
+ public static byte[] compile(String className, CharSequence sourceCode, String... options) {
+ MemoryJavaFileObject file = new MemoryJavaFileObject(className, sourceCode);
+ CompilationTask task = getCompilationTask(file, options);
+
+ if(!task.call()) {
+ throw new RuntimeException("Could not compile " + className + " with source code " + sourceCode);
+ }
+
+ return file.getByteCode();
+ }
+
+ private static JavaCompiler getCompiler() {
+ return ToolProvider.getSystemJavaCompiler();
+ }
+
+ private static CompilationTask getCompilationTask(MemoryJavaFileObject file, String... options) {
+ List opts = new ArrayList<>();
+ String moduleOverride = null;
+ for (String opt : options) {
+ if (opt.startsWith("--patch-module=")) {
+ moduleOverride = opt.substring("--patch-module=".length());
+ } else {
+ opts.add(opt);
+ }
+ }
+ return getCompiler().getTask(null, new FileManagerWrapper(file, moduleOverride), null, opts, null, Arrays.asList(file));
+ }
+}