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/*
* Copyright (c) 2008, 2011, 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. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* 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 sun.invoke.util;
import java.lang.invoke.MethodType;
import java.util.ArrayList;
import java.util.List;
/**
* Utility routines for dealing with bytecode-level signatures.
* @author jrose
*/
public class BytecodeDescriptor {
private BytecodeDescriptor() { } // cannot instantiate
public static List<Class<?>> parseMethod(String bytecodeSignature, ClassLoader loader) {
return parseMethod(bytecodeSignature, 0, bytecodeSignature.length(), loader);
}
static List<Class<?>> parseMethod(String bytecodeSignature,
int start, int end, ClassLoader loader) {
if (loader == null)
loader = ClassLoader.getSystemClassLoader();
String str = bytecodeSignature;
int[] i = {start};
ArrayList<Class<?>> ptypes = new ArrayList<Class<?>>();
if (i[0] < end && str.charAt(i[0]) == '(') {
++i[0]; // skip '('
while (i[0] < end && str.charAt(i[0]) != ')') {
Class<?> pt = parseSig(str, i, end, loader);
if (pt == null || pt == void.class)
parseError(str, "bad argument type");
ptypes.add(pt);
}
++i[0]; // skip ')'
} else {
parseError(str, "not a method type");
}
Class<?> rtype = parseSig(str, i, end, loader);
if (rtype == null || i[0] != end)
parseError(str, "bad return type");
ptypes.add(rtype);
return ptypes;
}
static private void parseError(String str, String msg) {
throw new IllegalArgumentException("bad signature: "+str+": "+msg);
}
static private Class<?> parseSig(String str, int[] i, int end, ClassLoader loader) {
if (i[0] == end) return null;
char c = str.charAt(i[0]++);
if (c == 'L') {
int begc = i[0], endc = str.indexOf(';', begc);
if (endc < 0) return null;
i[0] = endc+1;
String name = str.substring(begc, endc).replace('/', '.');
try {
return loader.loadClass(name);
} catch (ClassNotFoundException ex) {
throw new TypeNotPresentException(name, ex);
}
} else if (c == '[') {
Class<?> t = parseSig(str, i, end, loader);
if (t != null)
t = java.lang.reflect.Array.newInstance(t, 0).getClass();
return t;
} else {
return Wrapper.forBasicType(c).primitiveType();
}
}
public static String unparse(Class<?> type) {
StringBuilder sb = new StringBuilder();
unparseSig(type, sb);
return sb.toString();
}
public static String unparse(MethodType type) {
return unparseMethod(type.returnType(), type.parameterList());
}
public static String unparse(Object type) {
if (type instanceof Class<?>)
return unparse((Class<?>) type);
if (type instanceof MethodType)
return unparse((MethodType) type);
return (String) type;
}
public static String unparseMethod(Class<?> rtype, List<Class<?>> ptypes) {
StringBuilder sb = new StringBuilder();
sb.append('(');
for (Class<?> pt : ptypes)
unparseSig(pt, sb);
sb.append(')');
unparseSig(rtype, sb);
return sb.toString();
}
static private void unparseSig(Class<?> t, StringBuilder sb) {
char c = Wrapper.forBasicType(t).basicTypeChar();
if (c != 'L') {
sb.append(c);
} else {
boolean lsemi = (!t.isArray());
if (lsemi) sb.append('L');
sb.append(t.getName().replace('.', '/'));
if (lsemi) sb.append(';');
}
}
}
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