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1 | /******************************************************************************* |
2 | * Copyright (c) 2015 Ericsson | |
3 | * | |
4 | * All rights reserved. This program and the accompanying materials are made | |
5 | * available under the terms of the Eclipse Public License v1.0 which | |
6 | * accompanies this distribution, and is available at | |
7 | * http://www.eclipse.org/legal/epl-v10.html | |
8 | *******************************************************************************/ | |
9 | ||
10 | package org.eclipse.tracecompass.internal.ctf.core.event.metadata.tsdl; | |
11 | ||
12 | import static org.eclipse.tracecompass.internal.ctf.core.event.metadata.tsdl.TsdlUtils.isUnaryInteger; | |
13 | ||
14 | import org.antlr.runtime.tree.CommonTree; | |
15 | import org.eclipse.tracecompass.internal.ctf.core.event.metadata.ICommonTreeParser; | |
16 | import org.eclipse.tracecompass.internal.ctf.core.event.metadata.ParseException; | |
17 | ||
18 | /** | |
19 | * Type size, in bits, for integers and floats is that returned by sizeof() in C | |
20 | * multiplied by CHAR_BIT. We require the size of char and unsigned char types | |
21 | * (CHAR_BIT) to be fixed to 8 bits for cross-endianness compatibility. | |
22 | * | |
23 | * TSDL metadata representation: | |
24 | * | |
25 | * <pre> | |
26 | * size = /* value is in bits * / | |
27 | * </pre> | |
28 | * | |
29 | * @author Matthew Khouzam | |
30 | * @author Efficios - javadoc preamble. | |
31 | */ | |
32 | public class SizeParser implements ICommonTreeParser { | |
33 | private static final String INVALID_VALUE_FOR_SIZE = "Invalid value for size"; //$NON-NLS-1$ | |
34 | ||
35 | /** | |
36 | * Instance | |
37 | */ | |
38 | public static final SizeParser INSTANCE = new SizeParser(); | |
39 | ||
40 | private SizeParser() { | |
41 | } | |
42 | ||
43 | /** | |
44 | * Gets the value of a "size" integer attribute. | |
45 | * | |
46 | * @param rightNode | |
47 | * A CTF_RIGHT node. | |
48 | * @param param | |
49 | * unused | |
50 | * @return The "size" value. Can be 4 bytes. | |
51 | * @throws ParseException | |
52 | * if the size is not an int or a negative | |
53 | */ | |
54 | @Override | |
55 | public Long parse(CommonTree rightNode, ICommonTreeParserParameter param) throws ParseException { | |
56 | CommonTree firstChild = (CommonTree) rightNode.getChild(0); | |
57 | if (isUnaryInteger(firstChild)) { | |
58 | if (rightNode.getChildCount() > 1) { | |
59 | throw new ParseException(INVALID_VALUE_FOR_SIZE); | |
60 | } | |
61 | long size = UnaryIntegerParser.INSTANCE.parse(firstChild, null); | |
62 | if (size < 1) { | |
63 | throw new ParseException(INVALID_VALUE_FOR_SIZE); | |
64 | } | |
65 | return size; | |
66 | } | |
67 | throw new ParseException(INVALID_VALUE_FOR_SIZE); | |
68 | } | |
69 | ||
70 | } |