8040097: Implement classfile tests for LocalVariableTable and LocalVariableTypeTable attribute

Reviewed-by: jjg, shurailine, emc

langtools/test/tools/javac/lib/InMemoryFileManager.java

@@ -0,0 +1,88 @@
+/*
+ * Copyright (c) 2014, 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.
+ */
+
+import java.io.*;
+import java.net.URI;
+import java.util.HashMap;
+import java.util.Map;
+import javax.tools.*;
+
+import static java.util.Collections.unmodifiableMap;
+
+/**
+ * class for storing source/byte code in memory.
+ */
+public class InMemoryFileManager extends ForwardingJavaFileManager {
+
+    private final Map<String, InMemoryJavaFile> classes = new HashMap<>();
+
+    public InMemoryFileManager(JavaFileManager fileManager) {
+        super(fileManager);
+    }
+
+    @Override
+    public JavaFileObject getJavaFileForOutput(Location location, String className, JavaFileObject.Kind kind, FileObject sibling) throws IOException {
+
+        InMemoryJavaFile javaFile = new InMemoryJavaFile(className);
+        classes.put(className, javaFile);
+        return javaFile;
+    }
+
+    @Override
+    public ClassLoader getClassLoader(Location location) {
+        return new ClassLoader(this.getClass().getClassLoader()) {
+            @Override
+            protected Class<?> findClass(String name) throws ClassNotFoundException {
+                InMemoryJavaFile classData = classes.get(name);
+                if (classData == null) throw new ClassNotFoundException(name);
+                byte[] byteCode = classData.bos.toByteArray();
+                return defineClass(name, byteCode, 0, byteCode.length);
+            }
+        };
+    }
+
+    public Map<String, ? extends JavaFileObject> getClasses() {
+        return unmodifiableMap(classes);
+    }
+
+    private static class InMemoryJavaFile extends SimpleJavaFileObject {
+
+        private final ByteArrayOutputStream bos =
+                new ByteArrayOutputStream();
+
+
+        protected InMemoryJavaFile(String name) {
+            super(URI.create("mfm:///" + name.replace('.', '/') + Kind.CLASS.extension), Kind.CLASS);
+        }
+
+        @Override
+        public OutputStream openOutputStream() throws IOException {
+            return bos;
+        }
+
+        @Override
+        public InputStream openInputStream() throws IOException {
+            return new ByteArrayInputStream(bos.toByteArray());
+        }
+    }
+}