143 lines
5.1 KiB
Java
143 lines
5.1 KiB
Java
/*
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* Copyright (c) 2009, Oracle and/or its affiliates. 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. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package com.sun.tools.javap;
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import com.sun.tools.classfile.Code_attribute;
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import com.sun.tools.classfile.Code_attribute.Exception_data;
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import com.sun.tools.classfile.Instruction;
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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 try blocks.
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*
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* <p><b>This is NOT part of any supported API.
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* If 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 TryBlockWriter extends InstructionDetailWriter {
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public enum NoteKind {
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START("try") {
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public boolean match(Exception_data 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 try") {
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public boolean match(Exception_data entry, int pc) {
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return (pc == entry.end_pc);
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}
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},
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HANDLER("catch") {
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public boolean match(Exception_data entry, int pc) {
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return (pc == entry.handler_pc);
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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(Exception_data entry, int pc);
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public final String text;
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};
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static TryBlockWriter instance(Context context) {
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TryBlockWriter instance = context.get(TryBlockWriter.class);
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if (instance == null)
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instance = new TryBlockWriter(context);
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return instance;
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}
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protected TryBlockWriter(Context context) {
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super(context);
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context.put(TryBlockWriter.class, this);
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constantWriter = ConstantWriter.instance(context);
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}
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public void reset(Code_attribute attr) {
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indexMap = new HashMap<Exception_data, Integer>();
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pcMap = new HashMap<Integer, List<Exception_data>>();
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for (int i = 0; i < attr.exception_table.length; i++) {
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Exception_data entry = attr.exception_table[i];
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indexMap.put(entry, i);
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put(entry.start_pc, entry);
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put(entry.end_pc, entry);
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put(entry.handler_pc, entry);
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}
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}
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public void writeDetails(Instruction instr) {
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writeTrys(instr, NoteKind.END);
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writeTrys(instr, NoteKind.START);
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writeTrys(instr, NoteKind.HANDLER);
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}
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public void writeTrys(Instruction instr, NoteKind kind) {
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String indent = space(2); // get from Options?
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int pc = instr.getPC();
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List<Exception_data> entries = pcMap.get(pc);
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if (entries != null) {
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for (ListIterator<Exception_data> 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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Exception_data 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("[");
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print(indexMap.get(entry));
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print("] ");
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if (entry.catch_type == 0)
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print("finally");
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else {
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print("#" + entry.catch_type);
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print(" // ");
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constantWriter.write(entry.catch_type);
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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, Exception_data entry) {
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List<Exception_data> list = pcMap.get(pc);
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if (list == null) {
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list = new ArrayList<Exception_data>();
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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 Map<Integer, List<Exception_data>> pcMap;
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private Map<Exception_data, Integer> indexMap;
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private ConstantWriter constantWriter;
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}
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