scouter.javassist.bytecode.ClassFilePrinter Maven / Gradle / Ivy
/*
* Javassist, a Java-bytecode translator toolkit.
* Copyright (C) 1999- Shigeru Chiba. All Rights Reserved.
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. Alternatively, the contents of this file may be used under
* the terms of the GNU Lesser General Public License Version 2.1 or later,
* or the Apache License Version 2.0.
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*/
package scouter.javassist.bytecode;
import java.io.PrintWriter;
import scouter.javassist.Modifier;
import java.util.List;
/**
* A utility class for priting the contents of a class file.
* It prints a constant pool table, fields, and methods in a
* human readable representation.
*/
public class ClassFilePrinter {
/**
* Prints the contents of a class file to the standard output stream.
*/
public static void print(ClassFile cf) {
print(cf, new PrintWriter(System.out, true));
}
/**
* Prints the contents of a class file.
*/
public static void print(ClassFile cf, PrintWriter out) {
List list;
int n;
/* 0x0020 (SYNCHRONIZED) means ACC_SUPER if the modifiers
* are of a class.
*/
int mod
= AccessFlag.toModifier(cf.getAccessFlags()
& ~AccessFlag.SYNCHRONIZED);
out.println("major: " + cf.major + ", minor: " + cf.minor
+ " modifiers: " + Integer.toHexString(cf.getAccessFlags()));
out.println(Modifier.toString(mod) + " class "
+ cf.getName() + " extends " + cf.getSuperclass());
String[] infs = cf.getInterfaces();
if (infs != null && infs.length > 0) {
out.print(" implements ");
out.print(infs[0]);
for (int i = 1; i < infs.length; ++i)
out.print(", " + infs[i]);
out.println();
}
out.println();
list = cf.getFields();
n = list.size();
for (int i = 0; i < n; ++i) {
FieldInfo finfo = (FieldInfo)list.get(i);
int acc = finfo.getAccessFlags();
out.println(Modifier.toString(AccessFlag.toModifier(acc))
+ " " + finfo.getName() + "\t"
+ finfo.getDescriptor());
printAttributes(finfo.getAttributes(), out, 'f');
}
out.println();
list = cf.getMethods();
n = list.size();
for (int i = 0; i < n; ++i) {
MethodInfo minfo = (MethodInfo)list.get(i);
int acc = minfo.getAccessFlags();
out.println(Modifier.toString(AccessFlag.toModifier(acc))
+ " " + minfo.getName() + "\t"
+ minfo.getDescriptor());
printAttributes(minfo.getAttributes(), out, 'm');
out.println();
}
out.println();
printAttributes(cf.getAttributes(), out, 'c');
}
static void printAttributes(List list, PrintWriter out, char kind) {
if (list == null)
return;
int n = list.size();
for (int i = 0; i < n; ++i) {
AttributeInfo ai = (AttributeInfo)list.get(i);
if (ai instanceof CodeAttribute) {
CodeAttribute ca = (CodeAttribute)ai;
out.println("attribute: " + ai.getName() + ": "
+ ai.getClass().getName());
out.println("max stack " + ca.getMaxStack()
+ ", max locals " + ca.getMaxLocals()
+ ", " + ca.getExceptionTable().size()
+ " catch blocks");
out.println("");
printAttributes(ca.getAttributes(), out, kind);
out.println("");
}
else if (ai instanceof AnnotationsAttribute) {
out.println("annnotation: " + ai.toString());
}
else if (ai instanceof ParameterAnnotationsAttribute) {
out.println("parameter annnotations: " + ai.toString());
}
else if (ai instanceof StackMapTable) {
out.println("");
StackMapTable.Printer.print((StackMapTable)ai, out);
out.println("");
}
else if (ai instanceof StackMap) {
out.println("");
((StackMap)ai).print(out);
out.println("");
}
else if (ai instanceof SignatureAttribute) {
SignatureAttribute sa = (SignatureAttribute)ai;
String sig = sa.getSignature();
out.println("signature: " + sig);
try {
String s;
if (kind == 'c')
s = SignatureAttribute.toClassSignature(sig).toString();
else if (kind == 'm')
s = SignatureAttribute.toMethodSignature(sig).toString();
else
s = SignatureAttribute.toFieldSignature(sig).toString();
out.println(" " + s);
}
catch (BadBytecode e) {
out.println(" syntax error");
}
}
else
out.println("attribute: " + ai.getName()
+ " (" + ai.get().length + " byte): "
+ ai.getClass().getName());
}
}
}