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/*
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* Copyright 2009 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package com.sun.tools.javap;
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import com.sun.tools.classfile.Attribute;
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import com.sun.tools.classfile.Code_attribute;
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import com.sun.tools.classfile.ConstantPool;
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import com.sun.tools.classfile.ConstantPoolException;
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import com.sun.tools.classfile.Descriptor;
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import com.sun.tools.classfile.Descriptor.InvalidDescriptor;
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import com.sun.tools.classfile.Instruction;
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import com.sun.tools.classfile.LocalVariableTable_attribute;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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import java.util.ListIterator;
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import java.util.Map;
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/**
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* Annotate instructions with details about local variables.
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*
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* <p><b>This is NOT part of any API supported by Sun Microsystems. If
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* you write code that depends on this, you do so at your own risk.
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* This code and its internal interfaces are subject to change or
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* deletion without notice.</b>
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*/
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public class LocalVariableTableWriter extends InstructionDetailWriter {
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public enum NoteKind {
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START("start") {
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public boolean match(LocalVariableTable_attribute.Entry entry, int pc) {
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return (pc == entry.start_pc);
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}
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},
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END("end") {
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public boolean match(LocalVariableTable_attribute.Entry entry, int pc) {
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return (pc == entry.start_pc + entry.length);
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}
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};
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NoteKind(String text) {
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this.text = text;
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}
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public abstract boolean match(LocalVariableTable_attribute.Entry entry, int pc);
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public final String text;
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};
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static LocalVariableTableWriter instance(Context context) {
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LocalVariableTableWriter instance = context.get(LocalVariableTableWriter.class);
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if (instance == null)
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instance = new LocalVariableTableWriter(context);
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return instance;
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}
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protected LocalVariableTableWriter(Context context) {
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super(context);
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context.put(LocalVariableTableWriter.class, this);
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classWriter = ClassWriter.instance(context);
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}
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public void reset(Code_attribute attr) {
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codeAttr = attr;
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pcMap = new HashMap<Integer, List<LocalVariableTable_attribute.Entry>>();
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LocalVariableTable_attribute lvt =
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(LocalVariableTable_attribute) (attr.attributes.get(Attribute.LocalVariableTable));
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if (lvt == null)
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return;
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for (int i = 0; i < lvt.local_variable_table.length; i++) {
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LocalVariableTable_attribute.Entry entry = lvt.local_variable_table[i];
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put(entry.start_pc, entry);
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put(entry.start_pc + entry.length, entry);
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}
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}
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public void writeDetails(Instruction instr) {
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int pc = instr.getPC();
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writeLocalVariables(pc, NoteKind.END);
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writeLocalVariables(pc, NoteKind.START);
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}
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@Override
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public void flush() {
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int pc = codeAttr.code_length;
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writeLocalVariables(pc, NoteKind.END);
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}
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public void writeLocalVariables(int pc, NoteKind kind) {
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ConstantPool constant_pool = classWriter.getClassFile().constant_pool;
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String indent = space(2); // get from Options?
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List<LocalVariableTable_attribute.Entry> entries = pcMap.get(pc);
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if (entries != null) {
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for (ListIterator<LocalVariableTable_attribute.Entry> iter =
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entries.listIterator(kind == NoteKind.END ? entries.size() : 0);
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kind == NoteKind.END ? iter.hasPrevious() : iter.hasNext() ; ) {
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LocalVariableTable_attribute.Entry entry =
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kind == NoteKind.END ? iter.previous() : iter.next();
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if (kind.match(entry, pc)) {
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print(indent);
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print(kind.text);
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print(" local ");
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print(entry.index);
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print(" // ");
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Descriptor d = new Descriptor(entry.descriptor_index);
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try {
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print(d.getFieldType(constant_pool));
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} catch (InvalidDescriptor e) {
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print(report(e));
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} catch (ConstantPoolException e) {
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print(report(e));
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}
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print(" ");
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try {
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print(constant_pool.getUTF8Value(entry.name_index));
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} catch (ConstantPoolException e) {
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print(report(e));
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}
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println();
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}
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}
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}
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}
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private void put(int pc, LocalVariableTable_attribute.Entry entry) {
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List<LocalVariableTable_attribute.Entry> list = pcMap.get(pc);
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if (list == null) {
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list = new ArrayList<LocalVariableTable_attribute.Entry>();
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pcMap.put(pc, list);
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}
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if (!list.contains(entry))
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list.add(entry);
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}
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private ClassWriter classWriter;
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private Code_attribute codeAttr;
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private Map<Integer, List<LocalVariableTable_attribute.Entry>> pcMap;
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}
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