org.ow2.asm/asm-tree/4.2 : org/objectweb/asm/util/ASMifier.java

ASMifier
http://asm.objectweb.org/asm-tree/: A very small and fast Java bytecode manipulation framework (ObjectWeb)
Eric Bruneton
Eugene Kuleshov
Remi Forax
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
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.
/***
 * 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
 * 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 org.objectweb.asm.util;

import java.io.FileInputStream;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.Map;

import org.objectweb.asm.Attribute;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.Handle;
import org.objectweb.asm.Label;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;

A Printer that prints the ASM code to generate the classes if visits. 
Author: Eric Bruneton/**
 * A {@link Printer} that prints the ASM code to generate the classes if visits.
 * 
 * @author Eric Bruneton
 */
public class ASMifier extends Printer {

    The name of the visitor variable in the produced code.
/**
     * The name of the visitor variable in the produced code.
     */
    protected final String name;

    Identifier of the annotation visitor variable in the produced code.
/**
     * Identifier of the annotation visitor variable in the produced code.
     */
    protected final int id;

    The label names. This map associates String values to Label keys. It is
used only in ASMifierMethodVisitor.
/**
     * The label names. This map associates String values to Label keys. It is
     * used only in ASMifierMethodVisitor.
     */
    protected Map<Label, String> labelNames;

    Pseudo access flag used to distinguish class access flags.
/**
     * Pseudo access flag used to distinguish class access flags.
     */
    private static final int ACCESS_CLASS = 262144;

    Pseudo access flag used to distinguish field access flags.
/**
     * Pseudo access flag used to distinguish field access flags.
     */
    private static final int ACCESS_FIELD = 524288;

    Pseudo access flag used to distinguish inner class flags.
/**
     * Pseudo access flag used to distinguish inner class flags.
     */
    private static final int ACCESS_INNER = 1048576;

    Constructs a new ASMifier. Subclasses must not use this
constructor. Instead, they must use the ASMifier(int, String, int) version. /**
     * Constructs a new {@link ASMifier}. <i>Subclasses must not use this
     * constructor</i>. Instead, they must use the
     * {@link #ASMifier(int, String, int)} version.
     */
    public ASMifier() {
        this(Opcodes.ASM4, "cw", 0);
    }

    Constructs a new ASMifier. 
Params: api –  the ASM API version implemented by this class. Must be one of Opcodes.ASM4.
name – 
           the name of the visitor variable in the produced code.
id – 
           identifier of the annotation visitor variable in the produced
           code./**
     * Constructs a new {@link ASMifier}.
     * 
     * @param api
     *            the ASM API version implemented by this class. Must be one of
     *            {@link Opcodes#ASM4}.
     * @param name
     *            the name of the visitor variable in the produced code.
     * @param id
     *            identifier of the annotation visitor variable in the produced
     *            code.
     */
    protected ASMifier(final int api, final String name, final int id) {
        super(api);
        this.name = name;
        this.id = id;
    }

    Prints the ASM source code to generate the given class to the standard
output.

Usage: ASMifier [-debug] <binary class name or class file name>
Params: args – 
           the command line arguments.
Throws: Exception – 
            if the class cannot be found, or if an IO exception occurs./**
     * Prints the ASM source code to generate the given class to the standard
     * output.
     * <p>
     * Usage: ASMifier [-debug] &lt;binary class name or class file name&gt;
     * 
     * @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 {
        int i = 0;
        int flags = ClassReader.SKIP_DEBUG;

        boolean ok = true;
        if (args.length < 1 || args.length > 2) {
            ok = false;
        }
        if (ok && "-debug".equals(args[0])) {
            i = 1;
            flags = 0;
            if (args.length != 2) {
                ok = false;
            }
        }
        if (!ok) {
            System.err
                    .println("Prints the ASM code to generate the given class.");
            System.err.println("Usage: ASMifier [-debug] "
                    + "<fully qualified class name or class file name>");
            return;
        }
        ClassReader cr;
        if (args[i].endsWith(".class") || args[i].indexOf('\\') > -1
                || args[i].indexOf('/') > -1) {
            cr = new ClassReader(new FileInputStream(args[i]));
        } else {
            cr = new ClassReader(args[i]);
        }
        cr.accept(new TraceClassVisitor(null, new ASMifier(), new PrintWriter(
                System.out)), flags);
    }

    // ------------------------------------------------------------------------
    // Classes
    // ------------------------------------------------------------------------

    @Override
    public void visit(final int version, final int access, final String name,
            final String signature, final String superName,
            final String[] interfaces) {
        String simpleName;
        int n = name.lastIndexOf('/');
        if (n == -1) {
            simpleName = name;
        } else {
            text.add("package asm." + name.substring(0, n).replace('/', '.')
                    + ";\n");
            simpleName = name.substring(n + 1);
        }
        text.add("import java.util.*;\n");
        text.add("import org.objectweb.asm.*;\n");
        text.add("import org.objectweb.asm.attrs.*;\n");
        text.add("public class " + simpleName + "Dump implements Opcodes {\n\n");
        text.add("public static byte[] dump () throws Exception {\n\n");
        text.add("ClassWriter cw = new ClassWriter(0);\n");
        text.add("FieldVisitor fv;\n");
        text.add("MethodVisitor mv;\n");
        text.add("AnnotationVisitor av0;\n\n");

        buf.setLength(0);
        buf.append("cw.visit(");
        switch (version) {
        case Opcodes.V1_1:
            buf.append("V1_1");
            break;
        case Opcodes.V1_2:
            buf.append("V1_2");
            break;
        case Opcodes.V1_3:
            buf.append("V1_3");
            break;
        case Opcodes.V1_4:
            buf.append("V1_4");
            break;
        case Opcodes.V1_5:
            buf.append("V1_5");
            break;
        case Opcodes.V1_6:
            buf.append("V1_6");
            break;
        case Opcodes.V1_7:
            buf.append("V1_7");
            break;
        default:
            buf.append(version);
            break;
        }
        buf.append(", ");
        appendAccess(access | ACCESS_CLASS);
        buf.append(", ");
        appendConstant(name);
        buf.append(", ");
        appendConstant(signature);
        buf.append(", ");
        appendConstant(superName);
        buf.append(", ");
        if (interfaces != null && interfaces.length > 0) {
            buf.append("new String[] {");
            for (int i = 0; i < interfaces.length; ++i) {
                buf.append(i == 0 ? " " : ", ");
                appendConstant(interfaces[i]);
            }
            buf.append(" }");
        } else {
            buf.append("null");
        }
        buf.append(");\n\n");
        text.add(buf.toString());
    }

    @Override
    public void visitSource(final String file, final String debug) {
        buf.setLength(0);
        buf.append("cw.visitSource(");
        appendConstant(file);
        buf.append(", ");
        appendConstant(debug);
        buf.append(");\n\n");
        text.add(buf.toString());
    }

    @Override
    public void visitOuterClass(final String owner, final String name,
            final String desc) {
        buf.setLength(0);
        buf.append("cw.visitOuterClass(");
        appendConstant(owner);
        buf.append(", ");
        appendConstant(name);
        buf.append(", ");
        appendConstant(desc);
        buf.append(");\n\n");
        text.add(buf.toString());
    }

    @Override
    public ASMifier visitClassAnnotation(final String desc,
            final boolean visible) {
        return visitAnnotation(desc, visible);
    }

    @Override
    public void visitClassAttribute(final Attribute attr) {
        visitAttribute(attr);
    }

    @Override
    public void visitInnerClass(final String name, final String outerName,
            final String innerName, final int access) {
        buf.setLength(0);
        buf.append("cw.visitInnerClass(");
        appendConstant(name);
        buf.append(", ");
        appendConstant(outerName);
        buf.append(", ");
        appendConstant(innerName);
        buf.append(", ");
        appendAccess(access | ACCESS_INNER);
        buf.append(");\n\n");
        text.add(buf.toString());
    }

    @Override
    public ASMifier visitField(final int access, final String name,
            final String desc, final String signature, final Object value) {
        buf.setLength(0);
        buf.append("{\n");
        buf.append("fv = cw.visitField(");
        appendAccess(access | ACCESS_FIELD);
        buf.append(", ");
        appendConstant(name);
        buf.append(", ");
        appendConstant(desc);
        buf.append(", ");
        appendConstant(signature);
        buf.append(", ");
        appendConstant(value);
        buf.append(");\n");
        text.add(buf.toString());
        ASMifier a = createASMifier("fv", 0);
        text.add(a.getText());
        text.add("}\n");
        return a;
    }

    @Override
    public ASMifier visitMethod(final int access, final String name,
            final String desc, final String signature, final String[] exceptions) {
        buf.setLength(0);
        buf.append("{\n");
        buf.append("mv = cw.visitMethod(");
        appendAccess(access);
        buf.append(", ");
        appendConstant(name);
        buf.append(", ");
        appendConstant(desc);
        buf.append(", ");
        appendConstant(signature);
        buf.append(", ");
        if (exceptions != null && exceptions.length > 0) {
            buf.append("new String[] {");
            for (int i = 0; i < exceptions.length; ++i) {
                buf.append(i == 0 ? " " : ", ");
                appendConstant(exceptions[i]);
            }
            buf.append(" }");
        } else {
            buf.append("null");
        }
        buf.append(");\n");
        text.add(buf.toString());
        ASMifier a = createASMifier("mv", 0);
        text.add(a.getText());
        text.add("}\n");
        return a;
    }

    @Override
    public void visitClassEnd() {
        text.add("cw.visitEnd();\n\n");
        text.add("return cw.toByteArray();\n");
        text.add("}\n");
        text.add("}\n");
    }

    // ------------------------------------------------------------------------
    // Annotations
    // ------------------------------------------------------------------------

    @Override
    public void visit(final String name, final Object value) {
        buf.setLength(0);
        buf.append("av").append(id).append(".visit(");
        appendConstant(buf, name);
        buf.append(", ");
        appendConstant(buf, value);
        buf.append(");\n");
        text.add(buf.toString());
    }

    @Override
    public void visitEnum(final String name, final String desc,
            final String value) {
        buf.setLength(0);
        buf.append("av").append(id).append(".visitEnum(");
        appendConstant(buf, name);
        buf.append(", ");
        appendConstant(buf, desc);
        buf.append(", ");
        appendConstant(buf, value);
        buf.append(");\n");
        text.add(buf.toString());
    }

    @Override
    public ASMifier visitAnnotation(final String name, final String desc) {
        buf.setLength(0);
        buf.append("{\n");
        buf.append("AnnotationVisitor av").append(id + 1).append(" = av");
        buf.append(id).append(".visitAnnotation(");
        appendConstant(buf, name);
        buf.append(", ");
        appendConstant(buf, desc);
        buf.append(");\n");
        text.add(buf.toString());
        ASMifier a = createASMifier("av", id + 1);
        text.add(a.getText());
        text.add("}\n");
        return a;
    }

    @Override
    public ASMifier visitArray(final String name) {
        buf.setLength(0);
        buf.append("{\n");
        buf.append("AnnotationVisitor av").append(id + 1).append(" = av");
        buf.append(id).append(".visitArray(");
        appendConstant(buf, name);
        buf.append(");\n");
        text.add(buf.toString());
        ASMifier a = createASMifier("av", id + 1);
        text.add(a.getText());
        text.add("}\n");
        return a;
    }

    @Override
    public void visitAnnotationEnd() {
        buf.setLength(0);
        buf.append("av").append(id).append(".visitEnd();\n");
        text.add(buf.toString());
    }

    // ------------------------------------------------------------------------
    // Fields
    // ------------------------------------------------------------------------

    @Override
    public ASMifier visitFieldAnnotation(final String desc,
            final boolean visible) {
        return visitAnnotation(desc, visible);
    }

    @Override
    public void visitFieldAttribute(final Attribute attr) {
        visitAttribute(attr);
    }

    @Override
    public void visitFieldEnd() {
        buf.setLength(0);
        buf.append(name).append(".visitEnd();\n");
        text.add(buf.toString());
    }

    // ------------------------------------------------------------------------
    // Methods
    // ------------------------------------------------------------------------

    @Override
    public ASMifier visitAnnotationDefault() {
        buf.setLength(0);
        buf.append("{\n").append("av0 = ").append(name)
                .append(".visitAnnotationDefault();\n");
        text.add(buf.toString());
        ASMifier a = createASMifier("av", 0);
        text.add(a.getText());
        text.add("}\n");
        return a;
    }

    @Override
    public ASMifier visitMethodAnnotation(final String desc,
            final boolean visible) {
        return visitAnnotation(desc, visible);
    }

    @Override
    public ASMifier visitParameterAnnotation(final int parameter,
            final String desc, final boolean visible) {
        buf.setLength(0);
        buf.append("{\n").append("av0 = ").append(name)
                .append(".visitParameterAnnotation(").append(parameter)
                .append(", ");
        appendConstant(desc);
        buf.append(", ").append(visible).append(");\n");
        text.add(buf.toString());
        ASMifier a = createASMifier("av", 0);
        text.add(a.getText());
        text.add("}\n");
        return a;
    }

    @Override
    public void visitMethodAttribute(final Attribute attr) {
        visitAttribute(attr);
    }

    @Override
    public void visitCode() {
        text.add(name + ".visitCode();\n");
    }

    @Override
    public void visitFrame(final int type, final int nLocal,
            final Object[] local, final int nStack, final Object[] stack) {
        buf.setLength(0);
        switch (type) {
        case Opcodes.F_NEW:
        case Opcodes.F_FULL:
            declareFrameTypes(nLocal, local);
            declareFrameTypes(nStack, stack);
            if (type == Opcodes.F_NEW) {
                buf.append(name).append(".visitFrame(Opcodes.F_NEW, ");
            } else {
                buf.append(name).append(".visitFrame(Opcodes.F_FULL, ");
            }
            buf.append(nLocal).append(", new Object[] {");
            appendFrameTypes(nLocal, local);
            buf.append("}, ").append(nStack).append(", new Object[] {");
            appendFrameTypes(nStack, stack);
            buf.append('}');
            break;
        case Opcodes.F_APPEND:
            declareFrameTypes(nLocal, local);
            buf.append(name).append(".visitFrame(Opcodes.F_APPEND,")
                    .append(nLocal).append(", new Object[] {");
            appendFrameTypes(nLocal, local);
            buf.append("}, 0, null");
            break;
        case Opcodes.F_CHOP:
            buf.append(name).append(".visitFrame(Opcodes.F_CHOP,")
                    .append(nLocal).append(", null, 0, null");
            break;
        case Opcodes.F_SAME:
            buf.append(name).append(
                    ".visitFrame(Opcodes.F_SAME, 0, null, 0, null");
            break;
        case Opcodes.F_SAME1:
            declareFrameTypes(1, stack);
            buf.append(name).append(
                    ".visitFrame(Opcodes.F_SAME1, 0, null, 1, new Object[] {");
            appendFrameTypes(1, stack);
            buf.append('}');
            break;
        }
        buf.append(");\n");
        text.add(buf.toString());
    }

    @Override
    public void visitInsn(final int opcode) {
        buf.setLength(0);
        buf.append(name).append(".visitInsn(").append(OPCODES[opcode])
                .append(");\n");
        text.add(buf.toString());
    }

    @Override
    public void visitIntInsn(final int opcode, final int operand) {
        buf.setLength(0);
        buf.append(name)
                .append(".visitIntInsn(")
                .append(OPCODES[opcode])
                .append(", ")
                .append(opcode == Opcodes.NEWARRAY ? TYPES[operand] : Integer
                        .toString(operand)).append(");\n");
        text.add(buf.toString());
    }

    @Override
    public void visitVarInsn(final int opcode, final int var) {
        buf.setLength(0);
        buf.append(name).append(".visitVarInsn(").append(OPCODES[opcode])
                .append(", ").append(var).append(");\n");
        text.add(buf.toString());
    }

    @Override
    public void visitTypeInsn(final int opcode, final String type) {
        buf.setLength(0);
        buf.append(name).append(".visitTypeInsn(").append(OPCODES[opcode])
                .append(", ");
        appendConstant(type);
        buf.append(");\n");
        text.add(buf.toString());
    }

    @Override
    public void visitFieldInsn(final int opcode, final String owner,
            final String name, final String desc) {
        buf.setLength(0);
        buf.append(this.name).append(".visitFieldInsn(")
                .append(OPCODES[opcode]).append(", ");
        appendConstant(owner);
        buf.append(", ");
        appendConstant(name);
        buf.append(", ");
        appendConstant(desc);
        buf.append(");\n");
        text.add(buf.toString());
    }

    @Override
    public void visitMethodInsn(final int opcode, final String owner,
            final String name, final String desc) {
        buf.setLength(0);
        buf.append(this.name).append(".visitMethodInsn(")
                .append(OPCODES[opcode]).append(", ");
        appendConstant(owner);
        buf.append(", ");
        appendConstant(name);
        buf.append(", ");
        appendConstant(desc);
        buf.append(");\n");
        text.add(buf.toString());
    }

    @Override
    public void visitInvokeDynamicInsn(String name, String desc, Handle bsm,
            Object... bsmArgs) {
        buf.setLength(0);
        buf.append(this.name).append(".visitInvokeDynamicInsn(");
        appendConstant(name);
        buf.append(", ");
        appendConstant(desc);
        buf.append(", ");
        appendConstant(bsm);
        buf.append(", new Object[]{");
        for (int i = 0; i < bsmArgs.length; ++i) {
            appendConstant(bsmArgs[i]);
            if (i != bsmArgs.length - 1) {
                buf.append(", ");
            }
        }
        buf.append("});\n");
        text.add(buf.toString());
    }

    @Override
    public void visitJumpInsn(final int opcode, final Label label) {
        buf.setLength(0);
        declareLabel(label);
        buf.append(name).append(".visitJumpInsn(").append(OPCODES[opcode])
                .append(", ");
        appendLabel(label);
        buf.append(");\n");
        text.add(buf.toString());
    }

    @Override
    public void visitLabel(final Label label) {
        buf.setLength(0);
        declareLabel(label);
        buf.append(name).append(".visitLabel(");
        appendLabel(label);
        buf.append(");\n");
        text.add(buf.toString());
    }

    @Override
    public void visitLdcInsn(final Object cst) {
        buf.setLength(0);
        buf.append(name).append(".visitLdcInsn(");
        appendConstant(cst);
        buf.append(");\n");
        text.add(buf.toString());
    }

    @Override
    public void visitIincInsn(final int var, final int increment) {
        buf.setLength(0);
        buf.append(name).append(".visitIincInsn(").append(var).append(", ")
                .append(increment).append(");\n");
        text.add(buf.toString());
    }

    @Override
    public void visitTableSwitchInsn(final int min, final int max,
            final Label dflt, final Label... labels) {
        buf.setLength(0);
        for (int i = 0; i < labels.length; ++i) {
            declareLabel(labels[i]);
        }
        declareLabel(dflt);

        buf.append(name).append(".visitTableSwitchInsn(").append(min)
                .append(", ").append(max).append(", ");
        appendLabel(dflt);
        buf.append(", new Label[] {");
        for (int i = 0; i < labels.length; ++i) {
            buf.append(i == 0 ? " " : ", ");
            appendLabel(labels[i]);
        }
        buf.append(" });\n");
        text.add(buf.toString());
    }

    @Override
    public void visitLookupSwitchInsn(final Label dflt, final int[] keys,
            final Label[] labels) {
        buf.setLength(0);
        for (int i = 0; i < labels.length; ++i) {
            declareLabel(labels[i]);
        }
        declareLabel(dflt);

        buf.append(name).append(".visitLookupSwitchInsn(");
        appendLabel(dflt);
        buf.append(", new int[] {");
        for (int i = 0; i < keys.length; ++i) {
            buf.append(i == 0 ? " " : ", ").append(keys[i]);
        }
        buf.append(" }, new Label[] {");
        for (int i = 0; i < labels.length; ++i) {
            buf.append(i == 0 ? " " : ", ");
            appendLabel(labels[i]);
        }
        buf.append(" });\n");
        text.add(buf.toString());
    }

    @Override
    public void visitMultiANewArrayInsn(final String desc, final int dims) {
        buf.setLength(0);
        buf.append(name).append(".visitMultiANewArrayInsn(");
        appendConstant(desc);
        buf.append(", ").append(dims).append(");\n");
        text.add(buf.toString());
    }

    @Override
    public void visitTryCatchBlock(final Label start, final Label end,
            final Label handler, final String type) {
        buf.setLength(0);
        declareLabel(start);
        declareLabel(end);
        declareLabel(handler);
        buf.append(name).append(".visitTryCatchBlock(");
        appendLabel(start);
        buf.append(", ");
        appendLabel(end);
        buf.append(", ");
        appendLabel(handler);
        buf.append(", ");
        appendConstant(type);
        buf.append(");\n");
        text.add(buf.toString());
    }

    @Override
    public void visitLocalVariable(final String name, final String desc,
            final String signature, final Label start, final Label end,
            final int index) {
        buf.setLength(0);
        buf.append(this.name).append(".visitLocalVariable(");
        appendConstant(name);
        buf.append(", ");
        appendConstant(desc);
        buf.append(", ");
        appendConstant(signature);
        buf.append(", ");
        appendLabel(start);
        buf.append(", ");
        appendLabel(end);
        buf.append(", ").append(index).append(");\n");
        text.add(buf.toString());
    }

    @Override
    public void visitLineNumber(final int line, final Label start) {
        buf.setLength(0);
        buf.append(name).append(".visitLineNumber(").append(line).append(", ");
        appendLabel(start);
        buf.append(");\n");
        text.add(buf.toString());
    }

    @Override
    public void visitMaxs(final int maxStack, final int maxLocals) {
        buf.setLength(0);
        buf.append(name).append(".visitMaxs(").append(maxStack).append(", ")
                .append(maxLocals).append(");\n");
        text.add(buf.toString());
    }

    @Override
    public void visitMethodEnd() {
        buf.setLength(0);
        buf.append(name).append(".visitEnd();\n");
        text.add(buf.toString());
    }

    // ------------------------------------------------------------------------
    // Common methods
    // ------------------------------------------------------------------------

    public ASMifier visitAnnotation(final String desc, final boolean visible) {
        buf.setLength(0);
        buf.append("{\n").append("av0 = ").append(name)
                .append(".visitAnnotation(");
        appendConstant(desc);
        buf.append(", ").append(visible).append(");\n");
        text.add(buf.toString());
        ASMifier a = createASMifier("av", 0);
        text.add(a.getText());
        text.add("}\n");
        return a;
    }

    public void visitAttribute(final Attribute attr) {
        buf.setLength(0);
        buf.append("// ATTRIBUTE ").append(attr.type).append('\n');
        if (attr instanceof ASMifiable) {
            if (labelNames == null) {
                labelNames = new HashMap<Label, String>();
            }
            buf.append("{\n");
            ((ASMifiable) attr).asmify(buf, "attr", labelNames);
            buf.append(name).append(".visitAttribute(attr);\n");
            buf.append("}\n");
        }
        text.add(buf.toString());
    }

    // ------------------------------------------------------------------------
    // Utility methods
    // ------------------------------------------------------------------------

    protected ASMifier createASMifier(final String name, final int id) {
        return new ASMifier(Opcodes.ASM4, name, id);
    }

    Appends a string representation of the given access modifiers to buf. 
Params: access – 
           some access modifiers./**
     * Appends a string representation of the given access modifiers to
     * {@link #buf buf}.
     * 
     * @param access
     *            some access modifiers.
     */
    void appendAccess(final int access) {
        boolean first = true;
        if ((access & Opcodes.ACC_PUBLIC) != 0) {
            buf.append("ACC_PUBLIC");
            first = false;
        }
        if ((access & Opcodes.ACC_PRIVATE) != 0) {
            buf.append("ACC_PRIVATE");
            first = false;
        }
        if ((access & Opcodes.ACC_PROTECTED) != 0) {
            buf.append("ACC_PROTECTED");
            first = false;
        }
        if ((access & Opcodes.ACC_FINAL) != 0) {
            if (!first) {
                buf.append(" + ");
            }
            buf.append("ACC_FINAL");
            first = false;
        }
        if ((access & Opcodes.ACC_STATIC) != 0) {
            if (!first) {
                buf.append(" + ");
            }
            buf.append("ACC_STATIC");
            first = false;
        }
        if ((access & Opcodes.ACC_SYNCHRONIZED) != 0) {
            if (!first) {
                buf.append(" + ");
            }
            if ((access & ACCESS_CLASS) == 0) {
                buf.append("ACC_SYNCHRONIZED");
            } else {
                buf.append("ACC_SUPER");
            }
            first = false;
        }
        if ((access & Opcodes.ACC_VOLATILE) != 0
                && (access & ACCESS_FIELD) != 0) {
            if (!first) {
                buf.append(" + ");
            }
            buf.append("ACC_VOLATILE");
            first = false;
        }
        if ((access & Opcodes.ACC_BRIDGE) != 0 && (access & ACCESS_CLASS) == 0
                && (access & ACCESS_FIELD) == 0) {
            if (!first) {
                buf.append(" + ");
            }
            buf.append("ACC_BRIDGE");
            first = false;
        }
        if ((access & Opcodes.ACC_VARARGS) != 0 && (access & ACCESS_CLASS) == 0
                && (access & ACCESS_FIELD) == 0) {
            if (!first) {
                buf.append(" + ");
            }
            buf.append("ACC_VARARGS");
            first = false;
        }
        if ((access & Opcodes.ACC_TRANSIENT) != 0
                && (access & ACCESS_FIELD) != 0) {
            if (!first) {
                buf.append(" + ");
            }
            buf.append("ACC_TRANSIENT");
            first = false;
        }
        if ((access & Opcodes.ACC_NATIVE) != 0 && (access & ACCESS_CLASS) == 0
                && (access & ACCESS_FIELD) == 0) {
            if (!first) {
                buf.append(" + ");
            }
            buf.append("ACC_NATIVE");
            first = false;
        }
        if ((access & Opcodes.ACC_ENUM) != 0
                && ((access & ACCESS_CLASS) != 0
                        || (access & ACCESS_FIELD) != 0 || (access & ACCESS_INNER) != 0)) {
            if (!first) {
                buf.append(" + ");
            }
            buf.append("ACC_ENUM");
            first = false;
        }
        if ((access & Opcodes.ACC_ANNOTATION) != 0
                && ((access & ACCESS_CLASS) != 0 || (access & ACCESS_INNER) != 0)) {
            if (!first) {
                buf.append(" + ");
            }
            buf.append("ACC_ANNOTATION");
            first = false;
        }
        if ((access & Opcodes.ACC_ABSTRACT) != 0) {
            if (!first) {
                buf.append(" + ");
            }
            buf.append("ACC_ABSTRACT");
            first = false;
        }
        if ((access & Opcodes.ACC_INTERFACE) != 0) {
            if (!first) {
                buf.append(" + ");
            }
            buf.append("ACC_INTERFACE");
            first = false;
        }
        if ((access & Opcodes.ACC_STRICT) != 0) {
            if (!first) {
                buf.append(" + ");
            }
            buf.append("ACC_STRICT");
            first = false;
        }
        if ((access & Opcodes.ACC_SYNTHETIC) != 0) {
            if (!first) {
                buf.append(" + ");
            }
            buf.append("ACC_SYNTHETIC");
            first = false;
        }
        if ((access & Opcodes.ACC_DEPRECATED) != 0) {
            if (!first) {
                buf.append(" + ");
            }
            buf.append("ACC_DEPRECATED");
            first = false;
        }
        if (first) {
            buf.append('0');
        }
    }

    Appends a string representation of the given constant to the given
buffer.
Params: cst –  an Integer, Float, Long, Double or String object. May be null./**
     * Appends a string representation of the given constant to the given
     * buffer.
     * 
     * @param cst
     *            an {@link Integer}, {@link Float}, {@link Long},
     *            {@link Double} or {@link String} object. May be <tt>null</tt>.
     */
    protected void appendConstant(final Object cst) {
        appendConstant(buf, cst);
    }

    Appends a string representation of the given constant to the given
buffer.
Params: buf – 
           a string buffer.
cst –  an Integer, Float, Long, Double or String object. May be null./**
     * Appends a string representation of the given constant to the given
     * buffer.
     * 
     * @param buf
     *            a string buffer.
     * @param cst
     *            an {@link Integer}, {@link Float}, {@link Long},
     *            {@link Double} or {@link String} object. May be <tt>null</tt>.
     */
    static void appendConstant(final StringBuffer buf, final Object cst) {
        if (cst == null) {
            buf.append("null");
        } else if (cst instanceof String) {
            appendString(buf, (String) cst);
        } else if (cst instanceof Type) {
            buf.append("Type.getType(\"");
            buf.append(((Type) cst).getDescriptor());
            buf.append("\")");
        } else if (cst instanceof Handle) {
            buf.append("new Handle(");
            Handle h = (Handle) cst;
            buf.append("Opcodes.").append(HANDLE_TAG[h.getTag()])
                    .append(", \"");
            buf.append(h.getOwner()).append("\", \"");
            buf.append(h.getName()).append("\", \"");
            buf.append(h.getDesc()).append("\")");
        } else if (cst instanceof Byte) {
            buf.append("new Byte((byte)").append(cst).append(')');
        } else if (cst instanceof Boolean) {
            buf.append(((Boolean) cst).booleanValue() ? "Boolean.TRUE"
                    : "Boolean.FALSE");
        } else if (cst instanceof Short) {
            buf.append("new Short((short)").append(cst).append(')');
        } else if (cst instanceof Character) {
            int c = ((Character) cst).charValue();
            buf.append("new Character((char)").append(c).append(')');
        } else if (cst instanceof Integer) {
            buf.append("new Integer(").append(cst).append(')');
        } else if (cst instanceof Float) {
            buf.append("new Float(\"").append(cst).append("\")");
        } else if (cst instanceof Long) {
            buf.append("new Long(").append(cst).append("L)");
        } else if (cst instanceof Double) {
            buf.append("new Double(\"").append(cst).append("\")");
        } else if (cst instanceof byte[]) {
            byte[] v = (byte[]) cst;
            buf.append("new byte[] {");
            for (int i = 0; i < v.length; i++) {
                buf.append(i == 0 ? "" : ",").append(v[i]);
            }
            buf.append('}');
        } else if (cst instanceof boolean[]) {
            boolean[] v = (boolean[]) cst;
            buf.append("new boolean[] {");
            for (int i = 0; i < v.length; i++) {
                buf.append(i == 0 ? "" : ",").append(v[i]);
            }
            buf.append('}');
        } else if (cst instanceof short[]) {
            short[] v = (short[]) cst;
            buf.append("new short[] {");
            for (int i = 0; i < v.length; i++) {
                buf.append(i == 0 ? "" : ",").append("(short)").append(v[i]);
            }
            buf.append('}');
        } else if (cst instanceof char[]) {
            char[] v = (char[]) cst;
            buf.append("new char[] {");
            for (int i = 0; i < v.length; i++) {
                buf.append(i == 0 ? "" : ",").append("(char)")
                        .append((int) v[i]);
            }
            buf.append('}');
        } else if (cst instanceof int[]) {
            int[] v = (int[]) cst;
            buf.append("new int[] {");
            for (int i = 0; i < v.length; i++) {
                buf.append(i == 0 ? "" : ",").append(v[i]);
            }
            buf.append('}');
        } else if (cst instanceof long[]) {
            long[] v = (long[]) cst;
            buf.append("new long[] {");
            for (int i = 0; i < v.length; i++) {
                buf.append(i == 0 ? "" : ",").append(v[i]).append('L');
            }
            buf.append('}');
        } else if (cst instanceof float[]) {
            float[] v = (float[]) cst;
            buf.append("new float[] {");
            for (int i = 0; i < v.length; i++) {
                buf.append(i == 0 ? "" : ",").append(v[i]).append('f');
            }
            buf.append('}');
        } else if (cst instanceof double[]) {
            double[] v = (double[]) cst;
            buf.append("new double[] {");
            for (int i = 0; i < v.length; i++) {
                buf.append(i == 0 ? "" : ",").append(v[i]).append('d');
            }
            buf.append('}');
        }
    }

    private void declareFrameTypes(final int n, final Object[] o) {
        for (int i = 0; i < n; ++i) {
            if (o[i] instanceof Label) {
                declareLabel((Label) o[i]);
            }
        }
    }

    private void appendFrameTypes(final int n, final Object[] o) {
        for (int i = 0; i < n; ++i) {
            if (i > 0) {
                buf.append(", ");
            }
            if (o[i] instanceof String) {
                appendConstant(o[i]);
            } else if (o[i] instanceof Integer) {
                switch (((Integer) o[i]).intValue()) {
                case 0:
                    buf.append("Opcodes.TOP");
                    break;
                case 1:
                    buf.append("Opcodes.INTEGER");
                    break;
                case 2:
                    buf.append("Opcodes.FLOAT");
                    break;
                case 3:
                    buf.append("Opcodes.DOUBLE");
                    break;
                case 4:
                    buf.append("Opcodes.LONG");
                    break;
                case 5:
                    buf.append("Opcodes.NULL");
                    break;
                case 6:
                    buf.append("Opcodes.UNINITIALIZED_THIS");
                    break;
                }
            } else {
                appendLabel((Label) o[i]);
            }
        }
    }

    Appends a declaration of the given label to buf. This declaration is of the form "Label lXXX = new Label();". Does nothing if the given label has already been declared. 
Params: l – 
           a label./**
     * Appends a declaration of the given label to {@link #buf buf}. This
     * declaration is of the form "Label lXXX = new Label();". Does nothing if
     * the given label has already been declared.
     * 
     * @param l
     *            a label.
     */
    protected void declareLabel(final Label l) {
        if (labelNames == null) {
            labelNames = new HashMap<Label, String>();
        }
        String name = labelNames.get(l);
        if (name == null) {
            name = "l" + labelNames.size();
            labelNames.put(l, name);
            buf.append("Label ").append(name).append(" = new Label();\n");
        }
    }

    Appends the name of the given label to buf. The given label must already have a name. One way to ensure this is to always call declared before calling this method. 
Params: l – 
           a label./**
     * Appends the name of the given label to {@link #buf buf}. The given label
     * <i>must</i> already have a name. One way to ensure this is to always call
     * {@link #declareLabel declared} before calling this method.
     * 
     * @param l
     *            a label.
     */
    protected void appendLabel(final Label l) {
        buf.append(labelNames.get(l));
    }
}
Params:	args – the command line arguments.
Throws:	Exception – if the class cannot be found, or if an IO exception occurs.
/

org.ow2.asm/ asm-tree/ 4.2/ org/objectweb/asm/util/ASMifier.java
