Mercurial > hg > truffle
diff agent/src/share/classes/sun/jvm/hotspot/types/CIntegerType.java @ 0:a61af66fc99e jdk7-b24
Initial load
author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/agent/src/share/classes/sun/jvm/hotspot/types/CIntegerType.java Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,57 @@ +/* + * Copyright 2000 Sun Microsystems, Inc. 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. + * + * 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + +package sun.jvm.hotspot.types; + +import java.util.*; + +/** <P> This subinterface of Type provides accessors to deal with all + C integer types. The observation is that, according to the C + specification, there is no guarantee that the integer types of + char, short, int, and long will not all be of the same size, + meaning that it is incorrect to use any Java primitive type that + is too small to hold all of these values when talking about C + integer types, signed or unsigned. </P> + + <P> Therefore we use long, the largest Java primitive type, + universally to hold C integer field values (deciding that a + ubiquitous change to BigInteger is not currently advantageous). + Routines which read C integers from fields know the fields' sizes + and signedness and read the appropriate number of bytes and handle + sign- or zero- extension for signed and unsigned types, + respectively. Unfortunately, since long is a signed 64-bit + integer, there will be problems handling C's unsigned 64-bit + integers, but these problems must be dealt with by the user. </P> */ +public interface CIntegerType extends Type { + /** Is this integer type unsigned? */ + public boolean isUnsigned(); + + /** What is the maximum value of this type? Note that this will not + work properly for unsigned long longs. */ + public long maxValue(); + + /** What is the minimum value of this type? Note that this will not + work properly for unsigned long longs. */ + public long minValue(); +}