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jeremybenn |
/**
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* ASM: a very small and fast Java bytecode manipulation framework
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* Copyright (c) 2000-2005 INRIA, France Telecom
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package org.objectweb.asm.util.attrs;
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import java.util.List;
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import java.util.Map;
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import org.objectweb.asm.Attribute;
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import org.objectweb.asm.ClassReader;
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import org.objectweb.asm.Label;
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import org.objectweb.asm.attrs.StackMapTableAttribute;
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import org.objectweb.asm.attrs.StackMapFrame;
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import org.objectweb.asm.attrs.StackMapType;
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/**
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* An {@link ASMifiable} {@link StackMapTableAttribute} sub class.
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*
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* @author Eugene Kuleshov
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*/
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public class ASMStackMapTableAttribute extends StackMapTableAttribute implements
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ASMifiable,
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Traceable
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{
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/**
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* Length of the attribute used for comparison
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*/
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private int len;
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public ASMStackMapTableAttribute() {
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super();
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}
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public ASMStackMapTableAttribute(List frames, int len) {
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super(frames);
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this.len = len;
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}
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protected Attribute read(
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ClassReader cr,
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int off,
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int len,
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char[] buf,
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int codeOff,
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Label[] labels)
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{
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StackMapTableAttribute attr = (StackMapTableAttribute) super.read(cr,
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off,
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len,
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buf,
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codeOff,
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labels);
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return new ASMStackMapTableAttribute(attr.getFrames(), len);
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}
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public void asmify(StringBuffer buf, String varName, Map labelNames) {
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List frames = getFrames();
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if (frames.size() == 0) {
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buf.append("List frames = Collections.EMPTY_LIST;\n");
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} else {
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buf.append("List frames = new ArrayList();\n");
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for (int i = 0; i < frames.size(); i++) {
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buf.append("{\n");
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StackMapFrame f = (StackMapFrame) frames.get(i);
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declareLabel(buf, labelNames, f.label);
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String frameVar = varName + "frame" + i;
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asmifyTypeInfo(buf, frameVar, labelNames, f.locals, "locals");
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asmifyTypeInfo(buf, frameVar, labelNames, f.stack, "stack");
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buf.append("StackMapFrame ")
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.append(frameVar)
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.append(" = new StackMapFrame(")
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.append(labelNames.get(f.label))
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.append(", locals, stack);\n");
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buf.append("frames.add(").append(frameVar).append(");\n");
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buf.append("}\n");
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}
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}
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buf.append("StackMapTableAttribute ").append(varName);
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buf.append(" = new StackMapTableAttribute(frames);\n");
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}
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void asmifyTypeInfo(
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StringBuffer buf,
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String varName,
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Map labelNames,
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List infos,
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String field)
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{
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if (infos.size() == 0) {
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buf.append("List ")
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.append(field)
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.append(" = Collections.EMPTY_LIST;\n");
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} else {
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buf.append("List ").append(field).append(" = new ArrayList();\n");
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buf.append("{\n");
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for (int i = 0; i < infos.size(); i++) {
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StackMapType typeInfo = (StackMapType) infos.get(i);
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String localName = varName + "Info" + i;
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int type = typeInfo.getType();
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buf.append("StackMapType ")
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.append(localName)
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.append(" = StackMapType.getTypeInfo( StackMapType.ITEM_")
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.append(StackMapType.ITEM_NAMES[type])
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.append(");\n");
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switch (type) {
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case StackMapType.ITEM_Object: //
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buf.append(localName)
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.append(".setObject(\"")
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.append(typeInfo.getObject())
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.append("\");\n");
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break;
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case StackMapType.ITEM_Uninitialized: //
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declareLabel(buf, labelNames, typeInfo.getLabel());
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buf.append(localName)
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.append(".setLabel(")
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.append(labelNames.get(typeInfo.getLabel()))
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.append(");\n");
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break;
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}
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buf.append(field)
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.append(".add(")
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.append(localName)
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.append(");\n");
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}
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buf.append("}\n");
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}
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}
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static void declareLabel(StringBuffer buf, Map labelNames, Label l) {
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String name = (String) labelNames.get(l);
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if (name == null) {
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name = "l" + labelNames.size();
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labelNames.put(l, name);
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buf.append("Label ").append(name).append(" = new Label();\n");
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}
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}
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public void trace(StringBuffer buf, Map labelNames) {
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List frames = getFrames();
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buf.append("[\n");
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for (int i = 0; i < frames.size(); i++) {
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StackMapFrame f = (StackMapFrame) frames.get(i);
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buf.append(" Frame:");
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appendLabel(buf, labelNames, f.label);
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buf.append(" locals[");
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traceTypeInfo(buf, labelNames, f.locals);
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buf.append("]");
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buf.append(" stack[");
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traceTypeInfo(buf, labelNames, f.stack);
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buf.append("]\n");
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}
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buf.append(" ] length:").append(len).append("\n");
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}
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private void traceTypeInfo(StringBuffer buf, Map labelNames, List infos) {
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String sep = "";
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for (int i = 0; i < infos.size(); i++) {
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StackMapType t = (StackMapType) infos.get(i);
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buf.append(sep).append(StackMapType.ITEM_NAMES[t.getType()]);
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sep = ", ";
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if (t.getType() == StackMapType.ITEM_Object) {
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buf.append(":").append(t.getObject());
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}
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if (t.getType() == StackMapType.ITEM_Uninitialized) {
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buf.append(":");
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appendLabel(buf, labelNames, t.getLabel());
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}
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}
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}
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protected void appendLabel(StringBuffer buf, Map labelNames, Label l) {
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String name = (String) labelNames.get(l);
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if (name == null) {
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name = "L" + labelNames.size();
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labelNames.put(l, name);
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}
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buf.append(name);
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}
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}
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