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/*
* 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
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*/
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.
*
* 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.
*/
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 entries = pcMap.get(pc);
if (entries != null) {
for (ListIterator 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 list = pcMap.get(pc);
if (list == null) {
list = new ArrayList<>();
pcMap.put(pc, list);
}
if (!list.contains(entry))
list.add(entry);
}
private Map> pcMap;
private Map indexMap;
private ConstantWriter constantWriter;
}