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/**

 * ASM: a very small and fast Java bytecode manipulation framework

 * Copyright (c) 2000-2005 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.attrs;

import java.util.List;

import java.util.Map;

import org.objectweb.asm.Attribute;

import org.objectweb.asm.ClassReader;

import org.objectweb.asm.Label;

import org.objectweb.asm.attrs.StackMapAttribute;

import org.objectweb.asm.attrs.StackMapFrame;

import org.objectweb.asm.attrs.StackMapType;

/**

 * An {@link ASMifiable} {@link StackMapAttribute} sub class.

 *

 * @author Eugene Kuleshov

 */

public class ASMStackMapAttribute extends StackMapAttribute implements

        ASMifiable,

        Traceable

{

    /**

     * Length of the attribute used for comparison

     */

    private int len;

    public ASMStackMapAttribute() {

        super();

    }

    public ASMStackMapAttribute(List frames, int len) {

        super(frames);

        this.len = len;

    }

    protected Attribute read(

        ClassReader cr,

        int off,

        int len,

        char[] buf,

        int codeOff,

        Label[] labels)

    {

        StackMapAttribute attr = (StackMapAttribute) super.read(cr,

                off,

                len,

                buf,

                codeOff,

                labels);

        return new ASMStackMapAttribute(attr.getFrames(), len);

    }

    public void asmify(StringBuffer buf, String varName, Map labelNames) {

        List frames = getFrames();

        buf.append("{\n");

        buf.append("StackMapAttribute ").append(varName).append("Attr");

        buf.append(" = new StackMapAttribute();\n");

        if (frames.size() > 0) {

            for (int i = 0; i < frames.size(); i++) {

                asmify((StackMapFrame) frames.get(i), buf, varName + "frame"

                        + i, labelNames);

            }

        }

        buf.append(varName).append(".visitAttribute(").append(varName);

        buf.append("Attr);\n}\n");

    }

    void asmify(

        StackMapFrame f,

        StringBuffer buf,

        String varName,

        Map labelNames)

    {

        declareLabel(buf, labelNames, f.label);

        buf.append("{\n");

        buf.append("StackMapFrame ")

                .append(varName)

                .append(" = new StackMapFrame();\n");

        buf.append(varName)

                .append(".label = ")

                .append(labelNames.get(f.label))

                .append(";\n");

        asmifyTypeInfo(buf, varName, labelNames, f.locals, "locals");

        asmifyTypeInfo(buf, varName, labelNames, f.stack, "stack");

        buf.append("cvAttr.frames.add(").append(varName).append(");\n");

        buf.append("}\n");

    }

    void asmifyTypeInfo(

        StringBuffer buf,

        String varName,

        Map labelNames,

        List infos,

        String field)

    {

        if (infos.size() > 0) {

            buf.append("{\n");

            for (int i = 0; i < infos.size(); i++) {

                StackMapType typeInfo = (StackMapType) infos.get(i);

                String localName = varName + "Info" + i;

                int type = typeInfo.getType();

                buf.append("StackMapType ")

                        .append(localName)

                        .append(" = StackMapType.getTypeInfo( StackMapType.ITEM_")

                        .append(StackMapType.ITEM_NAMES[type])

                        .append(");\n");

                switch (type) {

                    case StackMapType.ITEM_Object: //

                        buf.append(localName)

                                .append(".setObject(\"")

                                .append(typeInfo.getObject())

                                .append("\");\n");

                        break;

                    case StackMapType.ITEM_Uninitialized: //

                        declareLabel(buf, labelNames, typeInfo.getLabel());

                        buf.append(localName)

                                .append(".setLabel(")

                                .append(labelNames.get(typeInfo.getLabel()))

                                .append(");\n");

                        break;

                }

                buf.append(varName)

                        .append(".")

                        .append(field)

                        .append(".add(")

                        .append(localName)

                        .append(");\n");

            }

            buf.append("}\n");

        }

    }

    static void declareLabel(StringBuffer buf, Map labelNames, Label l) {

        String name = (String) labelNames.get(l);

        if (name == null) {

            name = "l" + labelNames.size();

            labelNames.put(l, name);

            buf.append("Label ").append(name).append(" = new Label();\n");

        }

    }

    public void trace(StringBuffer buf, Map labelNames) {

        List frames = getFrames();

        buf.append("[\n");

        for (int i = 0; i < frames.size(); i++) {

            StackMapFrame f = (StackMapFrame) frames.get(i);

            buf.append("    Frame:");

            appendLabel(buf, labelNames, f.label);

            buf.append(" locals[");

            traceTypeInfo(buf, labelNames, f.locals);

            buf.append("]");

            buf.append(" stack[");

            traceTypeInfo(buf, labelNames, f.stack);

            buf.append("]\n");

        }

        buf.append("  ] length:").append(len).append("\n");

    }

    private void traceTypeInfo(StringBuffer buf, Map labelNames, List infos) {

        String sep = "";

        for (int i = 0; i < infos.size(); i++) {

            StackMapType t = (StackMapType) infos.get(i);

            buf.append(sep).append(StackMapType.ITEM_NAMES[t.getType()]);

            sep = ", ";

            if (t.getType() == StackMapType.ITEM_Object) {

                buf.append(":").append(t.getObject());

            }

            if (t.getType() == StackMapType.ITEM_Uninitialized) {

                buf.append(":");

                appendLabel(buf, labelNames, t.getLabel());

            }

        }

    }

    protected void appendLabel(StringBuffer buf, Map labelNames, Label l) {

        String name = (String) labelNames.get(l);

        if (name == null) {

            name = "L" + labelNames.size();

            labelNames.put(l, name);

        }

        buf.append(name);

    }

}