jaroslav@1646: /*
jaroslav@1646:  * Copyright (c) 2008, 2011, Oracle and/or its affiliates. All rights reserved.
jaroslav@1646:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
jaroslav@1646:  *
jaroslav@1646:  * This code is free software; you can redistribute it and/or modify it
jaroslav@1646:  * under the terms of the GNU General Public License version 2 only, as
jaroslav@1646:  * published by the Free Software Foundation.  Oracle designates this
jaroslav@1646:  * particular file as subject to the "Classpath" exception as provided
jaroslav@1646:  * by Oracle in the LICENSE file that accompanied this code.
jaroslav@1646:  *
jaroslav@1646:  * This code is distributed in the hope that it will be useful, but WITHOUT
jaroslav@1646:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
jaroslav@1646:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
jaroslav@1646:  * version 2 for more details (a copy is included in the LICENSE file that
jaroslav@1646:  * accompanied this code).
jaroslav@1646:  *
jaroslav@1646:  * You should have received a copy of the GNU General Public License version
jaroslav@1646:  * 2 along with this work; if not, write to the Free Software Foundation,
jaroslav@1646:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
jaroslav@1646:  *
jaroslav@1646:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
jaroslav@1646:  * or visit www.oracle.com if you need additional information or have any
jaroslav@1646:  * questions.
jaroslav@1646:  */
jaroslav@1646: 
jaroslav@1646: package sun.invoke.util;
jaroslav@1646: 
jaroslav@1646: import java.lang.invoke.MethodType;
jaroslav@1646: import java.util.ArrayList;
jaroslav@1646: import java.util.List;
jaroslav@1646: 
jaroslav@1646: /**
jaroslav@1646:  * Utility routines for dealing with bytecode-level signatures.
jaroslav@1646:  * @author jrose
jaroslav@1646:  */
jaroslav@1646: public class BytecodeDescriptor {
jaroslav@1646: 
jaroslav@1646:     private BytecodeDescriptor() { }  // cannot instantiate
jaroslav@1646: 
jaroslav@1646:     public static List<Class<?>> parseMethod(String bytecodeSignature, ClassLoader loader) {
jaroslav@1646:         return parseMethod(bytecodeSignature, 0, bytecodeSignature.length(), loader);
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     static List<Class<?>> parseMethod(String bytecodeSignature,
jaroslav@1646:             int start, int end, ClassLoader loader) {
jaroslav@1646:         if (loader == null)
jaroslav@1646:             loader = ClassLoader.getSystemClassLoader();
jaroslav@1646:         String str = bytecodeSignature;
jaroslav@1646:         int[] i = {start};
jaroslav@1646:         ArrayList<Class<?>> ptypes = new ArrayList<Class<?>>();
jaroslav@1646:         if (i[0] < end && str.charAt(i[0]) == '(') {
jaroslav@1646:             ++i[0];  // skip '('
jaroslav@1646:             while (i[0] < end && str.charAt(i[0]) != ')') {
jaroslav@1646:                 Class<?> pt = parseSig(str, i, end, loader);
jaroslav@1646:                 if (pt == null || pt == void.class)
jaroslav@1646:                     parseError(str, "bad argument type");
jaroslav@1646:                 ptypes.add(pt);
jaroslav@1646:             }
jaroslav@1646:             ++i[0];  // skip ')'
jaroslav@1646:         } else {
jaroslav@1646:             parseError(str, "not a method type");
jaroslav@1646:         }
jaroslav@1646:         Class<?> rtype = parseSig(str, i, end, loader);
jaroslav@1646:         if (rtype == null || i[0] != end)
jaroslav@1646:             parseError(str, "bad return type");
jaroslav@1646:         ptypes.add(rtype);
jaroslav@1646:         return ptypes;
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     static private void parseError(String str, String msg) {
jaroslav@1646:         throw new IllegalArgumentException("bad signature: "+str+": "+msg);
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     static private Class<?> parseSig(String str, int[] i, int end, ClassLoader loader) {
jaroslav@1646:         if (i[0] == end)  return null;
jaroslav@1646:         char c = str.charAt(i[0]++);
jaroslav@1646:         if (c == 'L') {
jaroslav@1646:             int begc = i[0], endc = str.indexOf(';', begc);
jaroslav@1646:             if (endc < 0)  return null;
jaroslav@1646:             i[0] = endc+1;
jaroslav@1646:             String name = str.substring(begc, endc).replace('/', '.');
jaroslav@1646:             try {
jaroslav@1646:                 return loader.loadClass(name);
jaroslav@1646:             } catch (ClassNotFoundException ex) {
jaroslav@1646:                 throw new TypeNotPresentException(name, ex);
jaroslav@1646:             }
jaroslav@1646:         } else if (c == '[') {
jaroslav@1646:             Class<?> t = parseSig(str, i, end, loader);
jaroslav@1646:             if (t != null)
jaroslav@1646:                 t = java.lang.reflect.Array.newInstance(t, 0).getClass();
jaroslav@1646:             return t;
jaroslav@1646:         } else {
jaroslav@1646:             return Wrapper.forBasicType(c).primitiveType();
jaroslav@1646:         }
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     public static String unparse(Class<?> type) {
jaroslav@1646:         StringBuilder sb = new StringBuilder();
jaroslav@1646:         unparseSig(type, sb);
jaroslav@1646:         return sb.toString();
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     public static String unparse(MethodType type) {
jaroslav@1646:         return unparseMethod(type.returnType(), type.parameterList());
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     public static String unparse(Object type) {
jaroslav@1646:         if (type instanceof Class<?>)
jaroslav@1646:             return unparse((Class<?>) type);
jaroslav@1646:         if (type instanceof MethodType)
jaroslav@1646:             return unparse((MethodType) type);
jaroslav@1646:         return (String) type;
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     public static String unparseMethod(Class<?> rtype, List<Class<?>> ptypes) {
jaroslav@1646:         StringBuilder sb = new StringBuilder();
jaroslav@1646:         sb.append('(');
jaroslav@1646:         for (Class<?> pt : ptypes)
jaroslav@1646:             unparseSig(pt, sb);
jaroslav@1646:         sb.append(')');
jaroslav@1646:         unparseSig(rtype, sb);
jaroslav@1646:         return sb.toString();
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     static private void unparseSig(Class<?> t, StringBuilder sb) {
jaroslav@1646:         char c = Wrapper.forBasicType(t).basicTypeChar();
jaroslav@1646:         if (c != 'L') {
jaroslav@1646:             sb.append(c);
jaroslav@1646:         } else {
jaroslav@1646:             boolean lsemi = (!t.isArray());
jaroslav@1646:             if (lsemi)  sb.append('L');
jaroslav@1646:             sb.append(t.getName().replace('.', '/'));
jaroslav@1646:             if (lsemi)  sb.append(';');
jaroslav@1646:         }
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646: }