| /* |
| * Copyright (c) 2009, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package com.sun.tools.javap; |
| |
| import com.sun.tools.classfile.Code_attribute; |
| import com.sun.tools.classfile.Code_attribute.Exception_data; |
| import com.sun.tools.classfile.Instruction; |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.ListIterator; |
| import java.util.Map; |
| |
| /** |
| * Annotate instructions with details about try blocks. |
| * |
| * <p><b>This is NOT part of any supported API. |
| * If you write code that depends on this, you do so at your own risk. |
| * This code and its internal interfaces are subject to change or |
| * deletion without notice.</b> |
| */ |
| public class TryBlockWriter extends InstructionDetailWriter { |
| public enum NoteKind { |
| START("try") { |
| public boolean match(Exception_data entry, int pc) { |
| return (pc == entry.start_pc); |
| } |
| }, |
| END("end try") { |
| public boolean match(Exception_data entry, int pc) { |
| return (pc == entry.end_pc); |
| } |
| }, |
| HANDLER("catch") { |
| public boolean match(Exception_data entry, int pc) { |
| return (pc == entry.handler_pc); |
| } |
| }; |
| NoteKind(String text) { |
| this.text = text; |
| } |
| public abstract boolean match(Exception_data entry, int pc); |
| public final String text; |
| } |
| |
| static TryBlockWriter instance(Context context) { |
| TryBlockWriter instance = context.get(TryBlockWriter.class); |
| if (instance == null) |
| instance = new TryBlockWriter(context); |
| return instance; |
| } |
| |
| protected TryBlockWriter(Context context) { |
| super(context); |
| context.put(TryBlockWriter.class, this); |
| constantWriter = ConstantWriter.instance(context); |
| } |
| |
| public void reset(Code_attribute attr) { |
| indexMap = new HashMap<>(); |
| pcMap = new HashMap<>(); |
| for (int i = 0; i < attr.exception_table.length; i++) { |
| Exception_data entry = attr.exception_table[i]; |
| indexMap.put(entry, i); |
| put(entry.start_pc, entry); |
| put(entry.end_pc, entry); |
| put(entry.handler_pc, entry); |
| } |
| } |
| |
| public void writeDetails(Instruction instr) { |
| writeTrys(instr, NoteKind.END); |
| writeTrys(instr, NoteKind.START); |
| writeTrys(instr, NoteKind.HANDLER); |
| } |
| |
| public void writeTrys(Instruction instr, NoteKind kind) { |
| String indent = space(2); // get from Options? |
| int pc = instr.getPC(); |
| List<Exception_data> entries = pcMap.get(pc); |
| if (entries != null) { |
| for (ListIterator<Exception_data> iter = |
| entries.listIterator(kind == NoteKind.END ? entries.size() : 0); |
| kind == NoteKind.END ? iter.hasPrevious() : iter.hasNext() ; ) { |
| Exception_data entry = |
| kind == NoteKind.END ? iter.previous() : iter.next(); |
| if (kind.match(entry, pc)) { |
| print(indent); |
| print(kind.text); |
| print("["); |
| print(indexMap.get(entry)); |
| print("] "); |
| if (entry.catch_type == 0) |
| print("finally"); |
| else { |
| print("#" + entry.catch_type); |
| print(" // "); |
| constantWriter.write(entry.catch_type); |
| } |
| println(); |
| } |
| } |
| } |
| } |
| |
| private void put(int pc, Exception_data entry) { |
| List<Exception_data> list = pcMap.get(pc); |
| if (list == null) { |
| list = new ArrayList<>(); |
| pcMap.put(pc, list); |
| } |
| if (!list.contains(entry)) |
| list.add(entry); |
| } |
| |
| private Map<Integer, List<Exception_data>> pcMap; |
| private Map<Exception_data, Integer> indexMap; |
| private ConstantWriter constantWriter; |
| } |