com.codename1.tools.translator.bytecodes.TryCatch Maven / Gradle / Ivy
/*
* Copyright (c) 2012, Codename One 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. Codename One 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 Codename One through http://www.codenameone.com/ if you
* need additional information or have any questions.
*/
package com.codename1.tools.translator.bytecodes;
import java.util.ArrayList;
import java.util.List;
import org.objectweb.asm.Label;
import org.objectweb.asm.Opcodes;
/**
*
* @author Shai Almog
*/
public class TryCatch extends Instruction {
private Label start;
private Label end;
private Label handler;
private String type;
private static boolean firstException;
private static boolean hasTryCatch;
private static int counter;
public static void reset() {
firstException = true;
hasTryCatch = false;
counter = 1;
}
public TryCatch(Label start, Label end, Label handler, String type) {
super(-1);
this.start = start;
this.end = end;
this.handler = handler;
this.type = type;
LabelInstruction.labelIsUsed(handler);
}
@Override
public void addDependencies(List dependencyList) {
if(type != null) {
String t = type.replace('.', '_').replace('/', '_').replace('$', '_');
if(!dependencyList.contains(t)) {
dependencyList.add(t);
}
}
}
public static boolean isTryCatchInMethod() {
return hasTryCatch;
}
@Override
public void appendInstruction(StringBuilder b, List instructions) {
hasTryCatch = true;
if(firstException) {
// we need to append basic exception handling logic
//b.append(" DEFINE_EXCEPTION_HANDLING_CONSTANTS();\n");
firstException = false;
}
String cid = "0";
if(type != null) {
cid = "cn1_class_id_" + type.replace('/', '_').replace('$', '_');
}
LabelInstruction.addTryBeginLabel(start, cid, counter);
b.append(" int restoreTo");
b.append(start);
b.append(cid);
b.append(counter);
b.append(";\n int tryBlockOffset");
b.append(start);
b.append(cid);
b.append(counter);
b.append(";\n DEFINE_CATCH_BLOCK(catch_");
b.append(start);
b.append(cid);
b.append(counter);
b.append(", label_");
b.append(handler);
b.append(", restoreTo");
b.append(start);
b.append(cid);
b.append(counter);
b.append(");\n");
LabelInstruction.addTryEndLabel(end);
// We store the label catch depth so that we can explicitly use it
// for TRY_EXIT()
// Originally, TRY_EXIT() just blindly decremented the tryBlockLevel
// but this is insufficient in cases where the catch handler
// points to a position *inside* the catch block, which happens
// where there is a synchronized() block surrounding an exception
// point.
LabelInstruction.getLabelCatchDepth(end, instructions);
counter++;
// b.append("/* try/catch start: ");
// b.append(start);
// b.append(", end: ");
// b.append(end);
// b.append(", handler: ");
// b.append(handler);
// b.append(", type: ");
// b.append(type);
// b.append(" */\n\n");
}
}