oracle.toplink.libraries.asm.util.TraceClassVisitor Maven / Gradle / Ivy
/***
* ASM: a very small and fast Java bytecode manipulation framework
* Copyright (c) 2000,2002,2003 INRIA, France Telecom
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
package oracle.toplink.libraries.asm.util;
import java.io.FileInputStream;
import java.io.PrintWriter;
import oracle.toplink.libraries.asm.Attribute;
import oracle.toplink.libraries.asm.ClassReader;
import oracle.toplink.libraries.asm.ClassVisitor;
import oracle.toplink.libraries.asm.CodeVisitor;
import oracle.toplink.libraries.asm.Constants;
/**
* A {@link PrintClassVisitor PrintClassVisitor} that prints a disassembled
* view of the classes it visits. This class visitor can be used alone (see the
* {@link #main main} method) to disassemble a class. It can also be used in
* the middle of class visitor chain to trace the class that is visited at a
* given point in this chain. This may be uselful for debugging purposes.
*
* The trace printed when visiting the Hello class is the following:
*
*
*
* // compiled from Hello.java
* public class Hello {
*
* public static main ([Ljava/lang/String;)V
* GETSTATIC java/lang/System out Ljava/io/PrintStream;
* LDC "hello"
* INVOKEVIRTUAL java/io/PrintStream println (Ljava/lang/String;)V
* RETURN
* MAXSTACK = 2
* MAXLOCALS = 1
*
* public <init> ()V
* ALOAD 0
* INVOKESPECIAL java/lang/Object <init> ()V
* RETURN
* MAXSTACK = 1
* MAXLOCALS = 1
*
* }
*
*
* where Hello is defined by:
*
*
*
* public class Hello {
*
* public static void main (String[] args) {
* System.out.println("hello");
* }
* }
*
*
*
* @author Eric Bruneton, Eugene Kuleshov
*/
public class TraceClassVisitor extends PrintClassVisitor {
/**
* The {@link ClassVisitor ClassVisitor} to which this visitor delegates
* calls. May be null.
*/
protected final ClassVisitor cv;
/**
* Prints a disassembled view of the given class to the standard output.
*
* Usage: TraceClassVisitor [-debug]
* <fully qualified class name or class file name >
*
* @param args the command line arguments.
*
* @throws Exception if the class cannot be found, or if an IO exception
* occurs.
*/
public static void main (final String[] args) throws Exception {
if (args.length < 1 || args.length > 2) {
printUsage();
}
int i = 0;
boolean skipDebug = true;
if (args[0].equals("-debug")) {
i = 1;
skipDebug = false;
if (args.length != 2) {
printUsage();
}
}
ClassReader cr;
if (args[i].endsWith(".class")) {
cr = new ClassReader(new FileInputStream(args[i]));
} else {
cr = new ClassReader(args[i]);
}
cr.accept(new TraceClassVisitor(
null, new PrintWriter(System.out)), getDefaultAttributes(), skipDebug);
}
private static void printUsage () {
System.err.println("Prints a disassembled view of the given class.");
System.err.println("Usage: TraceClassVisitor [-debug] " +
"");
System.exit(-1);
}
/**
* Constructs a new {@link TraceClassVisitor TraceClassVisitor} object.
*
* @param cv the class visitor to which this adapter must delegate calls. May
* be null.
* @param pw the print writer to be used to print the class.
*/
public TraceClassVisitor (final ClassVisitor cv, final PrintWriter pw) {
super(pw);
this.cv = cv;
}
public void visit (
final int version,
final int access,
final String name,
final String superName,
final String[] interfaces,
final String sourceFile)
{
int major = version & 0xFFFF;
int minor = version >>> 16;
buf.setLength(0);
buf.append("// class version " + major + "." + minor + " (" + version + ")\n");
if ((access & Constants.ACC_DEPRECATED) != 0) {
buf.append("// DEPRECATED\n");
}
if (sourceFile != null) {
buf.append("// compiled from ").append(sourceFile).append("\n");
}
buf.append("// access flags ").append(access).append("\n");
appendAccess(access & ~Constants.ACC_SUPER);
if ((access & Constants.ACC_ANNOTATION) != 0) {
buf.append("@interface ");
} else if ((access & Constants.ACC_INTERFACE) != 0) {
buf.append("interface ");
} else if ((access & Constants.ACC_ENUM) != 0) {
buf.append("enum ");
} else {
buf.append("class ");
}
buf.append(name).append(" ");
if (superName != null && !superName.equals("java/lang/Object")) {
buf.append("extends ").append(superName).append(" ");
}
if (interfaces != null && interfaces.length > 0) {
buf.append("implements ");
for (int i = 0; i < interfaces.length; ++i) {
buf.append(interfaces[i]).append(" ");
}
}
buf.append("{\n\n");
text.add(buf.toString());
if (cv != null) {
cv.visit(version, access, name, superName, interfaces, sourceFile);
}
}
public void visitInnerClass (
final String name,
final String outerName,
final String innerName,
final int access)
{
buf.setLength(0);
buf.append(" INNERCLASS ")
.append(name)
.append(" ")
.append(outerName)
.append(" ")
.append(innerName)
.append(" ");
appendAccess(access & ~Constants.ACC_SUPER);
if ((access & Constants.ACC_ENUM) != 0) {
buf.append("enum ");
}
buf.append("\n");
text.add(buf.toString());
if (cv != null) {
cv.visitInnerClass(name, outerName, innerName, access);
}
}
public void visitField (
final int access,
final String name,
final String desc,
final Object value,
final Attribute attrs)
{
buf.setLength(0);
if ((access & Constants.ACC_DEPRECATED) != 0) {
buf.append(" // DEPRECATED\n");
}
buf.append(" // access flags ").append(access).append("\n");
buf.append(" ");
appendAccess(access);
if ((access & Constants.ACC_ENUM) != 0) {
buf.append("enum ");
}
buf.append(desc)
.append(" ")
.append(name);
if (value != null) {
buf.append(" = ");
if (value instanceof String) {
buf.append("\"").append(value).append("\"");
} else {
buf.append(value);
}
}
Attribute attr = attrs;
while (attr != null) {
buf.append(" FIELD ATTRIBUTE ").append(attr.type).append(" : ")
.append(attr.toString()).append("\n");
attr = attr.next;
}
buf.append("\n");
text.add(buf.toString());
if (cv != null) {
cv.visitField(access, name, desc, value, attrs);
}
}
public CodeVisitor visitMethod (
final int access,
final String name,
final String desc,
final String[] exceptions,
final Attribute attrs)
{
buf.setLength(0);
if ((access & Constants.ACC_DEPRECATED) != 0) {
buf.append(" // DEPRECATED\n");
}
buf.append(" // access flags ").append(access).append("\n");
buf.append(" ");
appendAccess(access);
if ((access & Constants.ACC_NATIVE) != 0) {
buf.append("native ");
}
if ((access & Constants.ACC_VARARGS) != 0) {
buf.append("varargs ");
}
if ((access & Constants.ACC_BRIDGE) != 0) {
buf.append("bridge ");
}
buf.append(name).
append(" ").
append(desc);
if (exceptions != null && exceptions.length > 0) {
buf.append(" throws ");
for (int i = 0; i < exceptions.length; ++i) {
buf.append(exceptions[i]).append(" ");
}
}
buf.append("\n");
text.add(buf.toString());
Attribute attr = attrs;
while (attr != null) {
buf.setLength(0);
buf.append(" METHOD ATTRIBUTE ").append(attr.type).append(" : ")
.append(attr.toString()).append("\n");
text.add(buf.toString());
attr = attr.next;
}
CodeVisitor cv;
if (this.cv != null) {
cv = this.cv.visitMethod(access, name, desc, exceptions, attrs);
} else {
cv = null;
}
PrintCodeVisitor pcv = new TraceCodeVisitor(cv);
text.add(pcv.getText());
return pcv;
}
public void visitAttribute (final Attribute attr) {
buf.setLength(0);
buf.append(" CLASS ATTRIBUTE ").append(attr.type).append(" : ")
.append(attr.toString()).append("\n");
text.add(buf.toString());
if (cv != null) {
cv.visitAttribute(attr);
}
}
public void visitEnd () {
text.add("}\n");
if (cv != null) {
cv.visitEnd();
}
super.visitEnd();
}
/**
* Appends a string representation of the given access modifiers to {@link
* #buf buf}.
*
* @param access some access modifiers.
*/
private void appendAccess (final int access) {
if ((access & Constants.ACC_PUBLIC) != 0) {
buf.append("public ");
}
if ((access & Constants.ACC_PRIVATE) != 0) {
buf.append("private ");
}
if ((access & Constants.ACC_PROTECTED) != 0) {
buf.append("protected ");
}
if ((access & Constants.ACC_FINAL) != 0) {
buf.append("final ");
}
if ((access & Constants.ACC_STATIC) != 0) {
buf.append("static ");
}
if ((access & Constants.ACC_SYNCHRONIZED) != 0) {
buf.append("synchronized ");
}
if ((access & Constants.ACC_VOLATILE) != 0) {
buf.append("volatile ");
}
if ((access & Constants.ACC_TRANSIENT) != 0) {
buf.append("transient ");
}
// if ((access & Constants.ACC_NATIVE) != 0) {
// buf.append("native ");
// }
if ((access & Constants.ACC_ABSTRACT) != 0) {
buf.append("abstract ");
}
if ((access & Constants.ACC_STRICT) != 0) {
buf.append("strictfp ");
}
}
}