Mercurial > hg > truffle
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/type/FloatStamp.java @ 13675:a87e5c330cbd
Fix equals and hashCode in Float/IntegerStamp.
author | Roland Schatz <roland.schatz@oracle.com> |
---|---|
date | Fri, 17 Jan 2014 15:40:50 +0100 |
parents | 038b834a66f1 |
children | f2b300c6e621 |
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/* * Copyright (c) 2012, 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.oracle.graal.nodes.type; import com.oracle.graal.api.meta.*; public class FloatStamp extends Stamp { private final double lowerBound; private final double upperBound; private final boolean nonNaN; protected FloatStamp(Kind kind) { this(kind, Double.NEGATIVE_INFINITY, Double.POSITIVE_INFINITY, false); assert kind == Kind.Float || kind == Kind.Double; } protected FloatStamp(Kind kind, double lowerBound, double upperBound, boolean nonNaN) { super(kind); assert (!nonNaN && Double.isNaN(lowerBound) && Double.isNaN(upperBound)) || lowerBound <= upperBound; this.lowerBound = lowerBound; this.upperBound = upperBound; this.nonNaN = nonNaN; } @Override public ResolvedJavaType javaType(MetaAccessProvider metaAccess) { return metaAccess.lookupJavaType(kind().toJavaClass()); } /** * The (inclusive) lower bound on the value described by this stamp. */ public double lowerBound() { return lowerBound; } /** * The (inclusive) upper bound on the value described by this stamp. */ public double upperBound() { return upperBound; } public boolean isNonNaN() { return nonNaN; } public boolean isUnrestricted() { return lowerBound == Double.NEGATIVE_INFINITY && upperBound == Double.POSITIVE_INFINITY && !nonNaN; } public boolean contains(double value) { if (Double.isNaN(value)) { return !nonNaN; } else { return value >= lowerBound && value <= upperBound; } } @Override public String toString() { StringBuilder str = new StringBuilder(); str.append(kind().getTypeChar()); str.append(nonNaN ? "!" : ""); if (lowerBound == upperBound) { str.append(" [").append(lowerBound).append(']'); } else if (lowerBound != Double.NEGATIVE_INFINITY || upperBound != Double.POSITIVE_INFINITY) { str.append(" [").append(lowerBound).append(" - ").append(upperBound).append(']'); } return str.toString(); } @Override public Stamp meet(Stamp otherStamp) { if (otherStamp == this) { return this; } if (otherStamp instanceof IllegalStamp) { return otherStamp.meet(this); } if (!(otherStamp instanceof FloatStamp)) { return StampFactory.illegal(Kind.Illegal); } FloatStamp other = (FloatStamp) otherStamp; assert kind() == other.kind(); double meetUpperBound = Math.max(upperBound, other.upperBound); double meetLowerBound = Math.min(lowerBound, other.lowerBound); boolean meetNonNaN = nonNaN && other.nonNaN; if (meetLowerBound == lowerBound && meetUpperBound == upperBound && meetNonNaN == nonNaN) { return this; } else if (meetLowerBound == other.lowerBound && meetUpperBound == other.upperBound && meetNonNaN == other.nonNaN) { return other; } else { return new FloatStamp(kind(), meetLowerBound, meetUpperBound, meetNonNaN); } } @Override public Stamp join(Stamp otherStamp) { if (otherStamp == this) { return this; } if (otherStamp instanceof IllegalStamp) { return otherStamp.join(this); } if (!(otherStamp instanceof FloatStamp)) { return StampFactory.illegal(Kind.Illegal); } FloatStamp other = (FloatStamp) otherStamp; assert kind() == other.kind(); double joinUpperBound = Math.min(upperBound, other.upperBound); double joinLowerBound = Math.max(lowerBound, other.lowerBound); boolean joinNonNaN = nonNaN || other.nonNaN; if (joinLowerBound == lowerBound && joinUpperBound == upperBound && joinNonNaN == nonNaN) { return this; } else if (joinLowerBound == other.lowerBound && joinUpperBound == other.upperBound && joinNonNaN == other.nonNaN) { return other; } else if (joinLowerBound > joinUpperBound) { return StampFactory.illegal(kind()); } else { return new FloatStamp(kind(), joinLowerBound, joinUpperBound, joinNonNaN); } } @Override public int hashCode() { final int prime = 31; int result = 1; long temp; result = prime * result + kind().hashCode(); temp = Double.doubleToLongBits(lowerBound); result = prime * result + (int) (temp ^ (temp >>> 32)); result = prime * result + (nonNaN ? 1231 : 1237); temp = Double.doubleToLongBits(upperBound); result = prime * result + (int) (temp ^ (temp >>> 32)); return result; } @Override public boolean equals(Object obj) { if (this == obj) { return true; } if (obj == null || getClass() != obj.getClass()) { return false; } FloatStamp other = (FloatStamp) obj; if (kind() != other.kind()) { return false; } if (Double.doubleToLongBits(lowerBound) != Double.doubleToLongBits(other.lowerBound)) { return false; } if (Double.doubleToLongBits(upperBound) != Double.doubleToLongBits(other.upperBound)) { return false; } if (nonNaN != other.nonNaN) { return false; } return true; } @Override public Constant asConstant() { if (nonNaN && lowerBound == upperBound) { switch (kind()) { case Float: return Constant.forFloat((float) lowerBound); case Double: return Constant.forDouble(lowerBound); } } return null; } }