--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/serviceability/dcmd/MethodIdentifierParser.java Wed Jul 05 20:01:44 2017 +0200
@@ -0,0 +1,196 @@
+/*
+ * 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.lang.reflect.Method;
+import java.util.ArrayList;
+
+public class MethodIdentifierParser {
+
+ private String logString;
+ private String className;
+ private String methodName;
+ private String methodDescriptor;
+
+ /**
+ * This is a utility class for parsing the log entries for a method. It supplies
+ * a few select methods for reflecting the class and method from that information.
+ *
+ * Example log entries:
+ * "java.util.TreeMap.successor(Ljava/util/TreeMap$Entry;)Ljava/util/TreeMap$Entry;"
+ */
+
+ public MethodIdentifierParser(String logString) {
+ this.logString = logString;
+
+ int i = logString.lastIndexOf("."); // find start of method name
+ className = logString.substring(0, i); // classname is everything before
+ int i2 = logString.indexOf("("); // Signature starts with an '('
+ methodName = logString.substring(i+1, i2);
+ methodDescriptor = logString.substring(i2, logString.length());
+
+ // Add sanity check for extracted fields
+ }
+
+ public Method getMethod() throws NoSuchMethodException, SecurityException, ClassNotFoundException, Exception {
+ try {
+ return Class.forName(className).getDeclaredMethod(methodName, getParamenterDescriptorArray());
+ } catch (UnexpectedTokenException e) {
+ throw new Exception("Parse failed");
+ }
+ }
+
+ public Class<?>[] getParamenterDescriptorArray() throws ClassNotFoundException, UnexpectedTokenException {
+ ParameterDecriptorIterator s = new ParameterDecriptorIterator(methodDescriptor);
+ Class<?> paramType;
+ ArrayList<Class<?>> list = new ArrayList<Class<?>>();
+ while ((paramType = s.nextParamType()) != null) {
+ list.add(paramType);
+ }
+ if (list.size() > 0) {
+ return list.toArray(new Class<?>[list.size()]);
+ } else {
+ return null;
+ }
+ }
+
+ class ParameterDecriptorIterator {
+
+ // This class uses charAt() indexing for startMark and i
+ // That is when i points to the last char it can be retrieved with
+ // charAt(i). Including the last char for a subString requires
+ // substring(startMark, i+1);
+
+ private String methodDescriptor;
+ private int startMark;
+
+ public ParameterDecriptorIterator(String signature) {
+ this.methodDescriptor = signature;
+ this.startMark = 0;
+ if (signature.charAt(0) == '(') {
+ this.startMark = 1;
+ }
+ }
+
+ public Class<?> nextParamType() throws UnexpectedTokenException {
+ int i = startMark;
+ while (methodDescriptor.length() > i) {
+ switch (methodDescriptor.charAt(i)) {
+ case 'C':
+ case 'B':
+ case 'I':
+ case 'J':
+ case 'Z':
+ case 'F':
+ case 'D':
+ case 'S':
+ // Primitive class case, but we may have gotten here with [ as first token
+ break;
+ case 'L':
+ // Internal class name suffixed by ';'
+ while (methodDescriptor.charAt(i) != ';') {
+ i++;
+ }
+ break;
+ case '[':
+ i++; // arrays -> do another pass
+ continue;
+ case ')':
+ return null; // end found
+ case 'V':
+ case ';':
+ default:
+ throw new UnexpectedTokenException(methodDescriptor, i);
+ }
+ break;
+ }
+ if (i == startMark) {
+ // Single char -> primitive class case
+ startMark++; // Update for next iteration
+ switch (methodDescriptor.charAt(i)) {
+ case 'C':
+ return char.class;
+ case 'B':
+ return byte.class;
+ case 'I':
+ return int.class;
+ case 'J':
+ return long.class;
+ case 'F':
+ return float.class;
+ case 'D':
+ return double.class;
+ case 'S':
+ return short.class;
+ case 'Z':
+ return boolean.class;
+ default:
+ throw new UnexpectedTokenException(methodDescriptor, i);
+ }
+ } else {
+ // Multi char case
+ String nextParam;
+ if (methodDescriptor.charAt(startMark) == 'L') {
+ // When reflecting a class the leading 'L' and trailing';' must be removed.
+ // (When reflecting an array of classes, they must remain...)
+ nextParam = methodDescriptor.substring(startMark+1, i);
+ } else {
+ // Any kind of array - simple case, use whole descriptor when reflecting.
+ nextParam = methodDescriptor.substring(startMark, i+1);
+ }
+ startMark = ++i; // Update for next iteration
+ try {
+ // The parameter descriptor uses JVM internal class identifier with '/' as
+ // package separator, but Class.forName expects '.'.
+ nextParam = nextParam.replace('/', '.');
+ return Class.forName(nextParam);
+ } catch (ClassNotFoundException e) {
+ System.out.println("Class not Found: " + nextParam);
+ return null;
+ }
+ }
+ }
+ }
+
+ class UnexpectedTokenException extends Exception {
+ String descriptor;
+ int i;
+ public UnexpectedTokenException(String descriptor, int i) {
+ this.descriptor = descriptor;
+ this.i = i;
+ }
+
+ @Override
+ public String toString() {
+ return "Unexpected token at: " + i + " in signature: " + descriptor;
+ }
+
+ private static final long serialVersionUID = 1L;
+ }
+
+ public void debugPrint() {
+ System.out.println("mlf in: " + logString);
+ System.out.println("mlf class: " + className);
+ System.out.println("mlf method: " + methodName);
+ System.out.println("mlf methodDescriptor: " + methodDescriptor);
+ }
+}