Mercurial > hg > truffle
view graal/com.oracle.max.asmdis/src/com/sun/max/asm/OffsetLiteral.java @ 4178:d1b26c17910a
Add the Dacapo benchmarks to the "lib" folder instead of using the environment variable. Fixed an issue in the downloader.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Mon, 02 Jan 2012 21:52:23 +0100 |
parents | e233f5660da4 |
children |
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/* * Copyright (c) 2007, 2011, Oracle 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. * * 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.sun.max.asm; /** * Represents an offset between two positions (represented by given labels) in the assembled code. */ public class OffsetLiteral extends MutableAssembledObject { /** * Creates an offset between two positions (represented by given labels) in the assembled code. * * @param base the label whose position marks the base of the offset * @param target the label whose position marks the target of the offset */ protected OffsetLiteral(Assembler assembler, int startPosition, int endPosition, Label target, Label base) { super(assembler, startPosition, endPosition); assembler.addFixedSizeAssembledObject(this); this.target = target; this.base = base; } private final Label target; private final Label base; @Override protected final void assemble() throws AssemblyException { final Assembler assembler = assembler(); final long offset = offset(); // select the correct assembler function to emit the offset. // The assembler knows the endianness to use switch(size()) { case 1: assembler.emitByte((byte) (offset & 0xFF)); break; case 2: assembler.emitShort((short) (offset & 0xFFFF)); break; case 4: assembler.emitInt((int) (offset & 0xFFFFFFFF)); break; case 8: assembler.emitLong(offset); break; default: throw new AssemblyException("Invalid size for offset literal"); } } public final long offset() throws AssemblyException { return target.position() - base.position(); } public final boolean isCode() { return false; } }