Mercurial > hg > truffle
view graal/com.oracle.max.asmdis/src/com/sun/max/asm/gen/risc/field/AlignedImmediateOperandField.java @ 3733:e233f5660da4
Added Java files from Maxine project.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sat, 17 Dec 2011 19:59:18 +0100 |
parents | |
children | bc8527f3071c |
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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.gen.risc.field; import java.util.*; import com.sun.max.asm.*; import com.sun.max.asm.gen.*; import com.sun.max.asm.gen.risc.bitRange.*; /** * An instruction field whose encoded value does not include bits for * the low-order 0 bits of the aligned values that the field represents. * This class can convert between the field's <i>argument</i> (i.e. * the represented value) and it's <i>operand</i> (i.e. the encoded value). */ public class AlignedImmediateOperandField extends ImmediateOperandField { protected int zeroes; public AlignedImmediateOperandField(BitRange bitRange, int zeroes) { super(bitRange); this.zeroes = zeroes; } @Override public String asJavaExpression() { final String value = valueString(); return "(" + super.asJavaExpression() + ") && ((" + value + " % " + grain() + ") == 0)"; } @Override public boolean check(Template template, List<Argument> arguments) { if (!super.check(template, arguments)) { return false; } final long value = template.bindingFor(this, arguments).asLong(); return (value % grain()) == 0; } @Override public int maxArgumentValue() { return super.maxArgumentValue() << zeroes(); } @Override public int minArgumentValue() { return super.minArgumentValue() << zeroes(); } @Override public int zeroes() { return zeroes; } /** * Converts an argument value to the operand value that does not include bits for the * implied low-order 0 bits that the aligned argument value is guaranteed to contain. * For example, if this field represents a 4-byte aligned value, then {@code argumentToOperand(536) == 134}. */ private int argumentToOperand(int value) throws AssemblyException { final int p = grain(); if (value % p != 0) { throw new AssemblyException("unaligned immediate operand: " + value); } return value / p; } /** * Converts an operand value to the argument value that includes * low-order 0 bits for the alignment of this field. * For example, if this field represents a 4-byte aligned value, * then {@code operandToArgument(134) == 536}. */ private int operandToArgument(int operand) { return operand << zeroes(); } @Override public int assemble(int value) throws IndexOutOfBoundsException, AssemblyException { return super.assemble(argumentToOperand(value)); } @Override public Immediate32Argument disassemble(int instruction) { return new Immediate32Argument(operandToArgument(extract(instruction))); } }