/*
* 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.bitRange;
import java.util.*;
/**
* A range of bits that is composed of several disjoint subranges.
*/
public class CompoundBitRange extends BitRange {
public CompoundBitRange() {
super();
}
private List<ContiguousBitRange> contiguousBitRanges = new ArrayList<ContiguousBitRange>();
public List<ContiguousBitRange> contiguousBitRanges() {
return contiguousBitRanges;
}
public void add(ContiguousBitRange contiguousBitRange) {
contiguousBitRanges.add(contiguousBitRange);
}
@Override
public CompoundBitRange move(boolean left, int bits) {
final CompoundBitRange movedRange = new CompoundBitRange();
for (ContiguousBitRange contiguousBitRange : contiguousBitRanges) {
movedRange.add((ContiguousBitRange) contiguousBitRange.move(left, bits));
}
return movedRange;
}
@Override
public int width() {
int result = 0;
for (ContiguousBitRange contiguousBitRange : contiguousBitRanges) {
result += contiguousBitRange.width();
}
return result;
}
@Override
public int encodedWidth() {
int result = 0;
for (ContiguousBitRange contiguousBitRange : contiguousBitRanges) {
result += contiguousBitRange.encodedWidth();
}
return result;
}
@Override
public int instructionMask() {
int mask = 0;
for (ContiguousBitRange contiguousBitRange : contiguousBitRanges) {
mask |= contiguousBitRange.instructionMask();
}
return mask;
}
@Override
public int numberOfLessSignificantBits() {
int result = 32;
for (ContiguousBitRange contiguousBitRange : contiguousBitRanges) {
final int n = contiguousBitRange.numberOfLessSignificantBits();
if (n < result) {
result = n;
}
}
return result;
}
@Override
public boolean equals(Object other) {
if (!(other instanceof CompoundBitRange)) {
return false;
}
final CompoundBitRange compoundBitRange = (CompoundBitRange) other;
return contiguousBitRanges.equals(compoundBitRange.contiguousBitRanges);
}
@Override
public int hashCode() {
return contiguousBitRanges.hashCode();
}
@Override
public String toString() {
String result = null;
for (ContiguousBitRange contiguousBitRange : contiguousBitRanges) {
if (result != null) {
result += "," + contiguousBitRange;
} else {
result = contiguousBitRange.toString();
}
}
return result;
}
/* Extracting */
@Override
public int extractSignedInt(int instruction) {
final Iterator<ContiguousBitRange> iterator = contiguousBitRanges.iterator();
final ContiguousBitRange firstBitRange = iterator.next();
int signedInt = firstBitRange.extractSignedInt(instruction);
while (iterator.hasNext()) {
final ContiguousBitRange contiguousBitRange = iterator.next();
signedInt <<= contiguousBitRange.width();
signedInt |= contiguousBitRange.extractUnsignedInt(instruction);
}
return signedInt;
}
@Override
public int extractUnsignedInt(int instruction) {
int unsignedInt = 0;
for (ContiguousBitRange contiguousBitRange : contiguousBitRanges) {
unsignedInt <<= contiguousBitRange.width();
unsignedInt |= contiguousBitRange.extractUnsignedInt(instruction);
}
return unsignedInt;
}
/* Inserting */
@Override
public int assembleUncheckedSignedInt(int signedInt) throws IndexOutOfBoundsException {
int value = signedInt;
int result = 0;
for (int i = contiguousBitRanges.size() - 1; i >= 0; i--) {
final ContiguousBitRange contiguousBitRange = contiguousBitRanges.get(i);
result |= contiguousBitRange.assembleUncheckedSignedInt(value);
value >>= contiguousBitRange.width();
}
return result;
}
@Override
public int assembleUncheckedUnsignedInt(int unsignedInt) throws IndexOutOfBoundsException {
int value = unsignedInt;
int result = 0;
for (int i = contiguousBitRanges.size() - 1; i >= 0; i--) {
final ContiguousBitRange contiguousBitRange = contiguousBitRanges.get(i);
result |= contiguousBitRange.assembleUncheckedUnsignedInt(value);
value >>>= contiguousBitRange.width();
}
return result;
}
@Override
public String encodingString(String value, boolean signed, boolean checked) {
final StringBuilder sb = new StringBuilder();
int shift = 0;
for (int i = contiguousBitRanges.size() - 1; i >= 0; i--) {
final ContiguousBitRange contiguousBitRange = contiguousBitRanges.get(i);
final String bits = (shift == 0) ? value : "(" + value + (signed ? " >> " : " >>> ") + shift + ")";
final String encoding = contiguousBitRange.encodingString(bits, signed, false);
if (encoding.length() != 0) {
if (sb.length() != 0) {
sb.append(" | ");
}
sb.append(encoding);
}
shift += contiguousBitRange.width();
}
return sb.toString();
}
}