/**
 * Copyright (C) 2010-2017 Gordon Fraser, Andrea Arcuri and EvoSuite
 * contributors
 *
 * This file is part of EvoSuite.
 *
 * EvoSuite is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3.0 of the License, or
 * (at your option) any later version.
 *
 * EvoSuite 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
 * Lesser Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with EvoSuite. If not, see <http://www.gnu.org/licenses/>.
 */
/**
 * 
 */
package org.evosuite.instrumentation;

import org.evosuite.PackageInfo;
import org.evosuite.runtime.instrumentation.AnnotatedLabel;
import org.evosuite.testcase.execution.ExecutionTrace;
import org.evosuite.testcase.execution.ExecutionTracer;
import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;

/**
 * <p>
 * ExplicitExceptionHandler class.
 * </p>
 * 
 * @author gordon
 */
public class ExplicitExceptionHandler extends MethodVisitor {

	private final String fullMethodName;

	private final String className;

	private boolean inErrorBranch = false;

	int currentLine = 0;

	/**
	 * <p>
	 * Constructor for ExplicitExceptionHandler.
	 * </p>
	 * 
	 * @param mv
	 *            a {@link org.objectweb.asm.MethodVisitor} object.
	 * @param className
	 *            a {@link java.lang.String} object.
	 * @param methodName
	 *            a {@link java.lang.String} object.
	 * @param desc
	 *            a {@link java.lang.String} object.
	 */
	public ExplicitExceptionHandler(MethodVisitor mv, String className,
	        String methodName, String desc) {
		super(Opcodes.ASM5, mv);
		fullMethodName = methodName + desc;
		this.className = className;
	}

	/* (non-Javadoc)
	 * @see org.objectweb.asm.MethodVisitor#visitLabel(org.objectweb.asm.Label)
	 */
	/** {@inheritDoc} */
	@Override
	public void visitLabel(Label label) {
		if (label instanceof AnnotatedLabel) {
			AnnotatedLabel l = (AnnotatedLabel) label;
			if (Boolean.TRUE.equals(l.info)) {
				inErrorBranch = true;
			} else {
				inErrorBranch = false;
			}
		}
		super.visitLabel(label);
	}

	/* (non-Javadoc)
	 * @see org.objectweb.asm.MethodVisitor#visitInsn(int)
	 */
	/** {@inheritDoc} */
	@Override
	public void visitInsn(int opcode) {
		if (opcode == Opcodes.ATHROW && !inErrorBranch) {
			super.visitInsn(Opcodes.DUP);
			this.visitLdcInsn(className);
			this.visitLdcInsn(fullMethodName);
			mv.visitMethodInsn(Opcodes.INVOKESTATIC,
					PackageInfo.getNameWithSlash(ExecutionTracer.class),
			                   "exceptionThrown",
			                   "(Ljava/lang/Object;Ljava/lang/String;Ljava/lang/String;)V", false);
		}
		super.visitInsn(opcode);
	}
}