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/*
 * This file is available under and governed by the GNU General Public
 * License version 2 only, as published by the Free Software Foundation.
 * However, the following notice accompanied the original version of this
 * file:
 *
 * ASM: a very small and fast Java bytecode manipulation framework
 * Copyright (c) 2000-2011 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
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package jdk.internal.org.objectweb.asm.util;

import jdk.internal.org.objectweb.asm.Opcodes;
import jdk.internal.org.objectweb.asm.signature.SignatureVisitor;

A SignatureVisitor that prints a disassembled view of the signature it visits.
Author:Eugene Kuleshov, Eric Bruneton
/** * A {@link SignatureVisitor} that prints a disassembled view of the signature * it visits. * * @author Eugene Kuleshov * @author Eric Bruneton */
public final class TraceSignatureVisitor extends SignatureVisitor { private final StringBuilder declaration; private boolean isInterface; private boolean seenFormalParameter; private boolean seenInterfaceBound; private boolean seenParameter; private boolean seenInterface; private StringBuilder returnType; private StringBuilder exceptions;
Stack used to keep track of class types that have arguments. Each element of this stack is a boolean encoded in one bit. The top of the stack is the lowest order bit. Pushing false = *2, pushing true = *2+1, popping = /2.
/** * Stack used to keep track of class types that have arguments. Each element * of this stack is a boolean encoded in one bit. The top of the stack is * the lowest order bit. Pushing false = *2, pushing true = *2+1, popping = * /2. */
private int argumentStack;
Stack used to keep track of array class types. Each element of this stack is a boolean encoded in one bit. The top of the stack is the lowest order bit. Pushing false = *2, pushing true = *2+1, popping = /2.
/** * Stack used to keep track of array class types. Each element of this stack * is a boolean encoded in one bit. The top of the stack is the lowest order * bit. Pushing false = *2, pushing true = *2+1, popping = /2. */
private int arrayStack; private String separator = ""; public TraceSignatureVisitor(final int access) { super(Opcodes.ASM6); isInterface = (access & Opcodes.ACC_INTERFACE) != 0; this.declaration = new StringBuilder(); } private TraceSignatureVisitor(final StringBuilder buf) { super(Opcodes.ASM6); this.declaration = buf; } @Override public void visitFormalTypeParameter(final String name) { declaration.append(seenFormalParameter ? ", " : "<").append(name); seenFormalParameter = true; seenInterfaceBound = false; } @Override public SignatureVisitor visitClassBound() { separator = " extends "; startType(); return this; } @Override public SignatureVisitor visitInterfaceBound() { separator = seenInterfaceBound ? ", " : " extends "; seenInterfaceBound = true; startType(); return this; } @Override public SignatureVisitor visitSuperclass() { endFormals(); separator = " extends "; startType(); return this; } @Override public SignatureVisitor visitInterface() { separator = seenInterface ? ", " : isInterface ? " extends " : " implements "; seenInterface = true; startType(); return this; } @Override public SignatureVisitor visitParameterType() { endFormals(); if (seenParameter) { declaration.append(", "); } else { seenParameter = true; declaration.append('('); } startType(); return this; } @Override public SignatureVisitor visitReturnType() { endFormals(); if (seenParameter) { seenParameter = false; } else { declaration.append('('); } declaration.append(')'); returnType = new StringBuilder(); return new TraceSignatureVisitor(returnType); } @Override public SignatureVisitor visitExceptionType() { if (exceptions == null) { exceptions = new StringBuilder(); } else { exceptions.append(", "); } // startType(); return new TraceSignatureVisitor(exceptions); } @Override public void visitBaseType(final char descriptor) { switch (descriptor) { case 'V': declaration.append("void"); break; case 'B': declaration.append("byte"); break; case 'J': declaration.append("long"); break; case 'Z': declaration.append("boolean"); break; case 'I': declaration.append("int"); break; case 'S': declaration.append("short"); break; case 'C': declaration.append("char"); break; case 'F': declaration.append("float"); break; // case 'D': default: declaration.append("double"); break; } endType(); } @Override public void visitTypeVariable(final String name) { declaration.append(name); endType(); } @Override public SignatureVisitor visitArrayType() { startType(); arrayStack |= 1; return this; } @Override public void visitClassType(final String name) { if ("java/lang/Object".equals(name)) { // Map<java.lang.Object,java.util.List> // or // abstract public V get(Object key); (seen in Dictionary.class) // should have Object // but java.lang.String extends java.lang.Object is unnecessary boolean needObjectClass = argumentStack % 2 != 0 || seenParameter; if (needObjectClass) { declaration.append(separator).append(name.replace('/', '.')); } } else { declaration.append(separator).append(name.replace('/', '.')); } separator = ""; argumentStack *= 2; } @Override public void visitInnerClassType(final String name) { if (argumentStack % 2 != 0) { declaration.append('>'); } argumentStack /= 2; declaration.append('.'); declaration.append(separator).append(name.replace('/', '.')); separator = ""; argumentStack *= 2; } @Override public void visitTypeArgument() { if (argumentStack % 2 == 0) { ++argumentStack; declaration.append('<'); } else { declaration.append(", "); } declaration.append('?'); } @Override public SignatureVisitor visitTypeArgument(final char tag) { if (argumentStack % 2 == 0) { ++argumentStack; declaration.append('<'); } else { declaration.append(", "); } if (tag == EXTENDS) { declaration.append("? extends "); } else if (tag == SUPER) { declaration.append("? super "); } startType(); return this; } @Override public void visitEnd() { if (argumentStack % 2 != 0) { declaration.append('>'); } argumentStack /= 2; endType(); } public String getDeclaration() { return declaration.toString(); } public String getReturnType() { return returnType == null ? null : returnType.toString(); } public String getExceptions() { return exceptions == null ? null : exceptions.toString(); } // ----------------------------------------------- private void endFormals() { if (seenFormalParameter) { declaration.append('>'); seenFormalParameter = false; } } private void startType() { arrayStack *= 2; } private void endType() { if (arrayStack % 2 == 0) { arrayStack /= 2; } else { while (arrayStack % 2 != 0) { arrayStack /= 2; declaration.append("[]"); } } } }