/*******************************************************************************
* Copyright (c) 2015 Ericsson
*
* All rights reserved. This program and the accompanying materials are made
* available under the terms of the Eclipse Public License v1.0 which
* accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*******************************************************************************/
package org.eclipse.tracecompass.internal.ctf.core.event.metadata.tsdl;
import static org.eclipse.tracecompass.internal.ctf.core.event.metadata.tsdl.TsdlUtils.isUnaryInteger;
import org.antlr.runtime.tree.CommonTree;
import org.eclipse.tracecompass.internal.ctf.core.event.metadata.ICommonTreeParser;
import org.eclipse.tracecompass.internal.ctf.core.event.metadata.ParseException;
/**
* Type size, in bits, for integers and floats is that returned by sizeof() in C
* multiplied by CHAR_BIT. We require the size of char and unsigned char types
* (CHAR_BIT) to be fixed to 8 bits for cross-endianness compatibility.
*
* TSDL metadata representation:
*
* <pre>
* size = /* value is in bits * /
* </pre>
*
* @author Matthew Khouzam
* @author Efficios - javadoc preamble.
*/
public final class SizeParser implements ICommonTreeParser {
private static final String INVALID_VALUE_FOR_SIZE = "Invalid value for size"; //$NON-NLS-1$
/**
* Instance
*/
public static final SizeParser INSTANCE = new SizeParser();
private SizeParser() {
}
/**
* Gets the value of a "size" integer attribute.
*
* @param rightNode
* A CTF_RIGHT node.
* @param param
* unused
* @return The "size" value. Can be 4 bytes.
* @throws ParseException
* if the size is not an int or a negative
*/
@Override
public Long parse(CommonTree rightNode, ICommonTreeParserParameter param) throws ParseException {
CommonTree firstChild = (CommonTree) rightNode.getChild(0);
if (isUnaryInteger(firstChild)) {
if (rightNode.getChildCount() > 1) {
throw new ParseException(INVALID_VALUE_FOR_SIZE);
}
long size = UnaryIntegerParser.INSTANCE.parse(firstChild, null);
if (size < 1) {
throw new ParseException(INVALID_VALUE_FOR_SIZE);
}
return size;
}
throw new ParseException(INVALID_VALUE_FOR_SIZE);
}
}