Mercurial > hg > truffle
view graal/com.oracle.graal.compiler.common/src/com/oracle/graal/compiler/common/type/AbstractPointerStamp.java @ 21696:ca140f8c35be
Empty pointer stamps are also non-null.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Wed, 03 Jun 2015 14:08:29 +0200 |
parents | 48c1ebd24120 |
children |
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/* * Copyright (c) 2014, 2015, 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.compiler.common.type; import com.oracle.jvmci.meta.Kind; import com.oracle.jvmci.meta.JavaConstant; import com.oracle.jvmci.meta.Constant; /** * Abstract base class of all pointer types. */ public abstract class AbstractPointerStamp extends Stamp { private final boolean nonNull; private final boolean alwaysNull; protected AbstractPointerStamp(boolean nonNull, boolean alwaysNull) { this.nonNull = nonNull; this.alwaysNull = alwaysNull; } public boolean nonNull() { return nonNull || this.isEmpty(); } public boolean alwaysNull() { return alwaysNull; } protected abstract AbstractPointerStamp copyWith(boolean newNonNull, boolean newAlwaysNull); @Override public int hashCode() { final int prime = 31; int result = 1; result = prime * result + (alwaysNull ? 1231 : 1237); result = prime * result + (nonNull ? 1231 : 1237); return result; } @Override public Stamp join(Stamp stamp) { AbstractPointerStamp other = (AbstractPointerStamp) stamp; boolean joinNonNull = this.nonNull || other.nonNull; boolean joinAlwaysNull = this.alwaysNull || other.alwaysNull; if (joinNonNull && joinAlwaysNull) { return empty(); } else { return copyWith(joinNonNull, joinAlwaysNull); } } @Override public Stamp improveWith(Stamp other) { return join(other); } @Override public Stamp meet(Stamp stamp) { AbstractPointerStamp other = (AbstractPointerStamp) stamp; boolean meetNonNull = this.nonNull && other.nonNull; boolean meetAlwaysNull = this.alwaysNull && other.alwaysNull; return copyWith(meetNonNull, meetAlwaysNull); } @Override public Stamp unrestricted() { return copyWith(false, false); } @Override public boolean equals(Object obj) { if (this == obj) { return true; } if (obj == null || getClass() != obj.getClass()) { return false; } AbstractPointerStamp other = (AbstractPointerStamp) obj; return this.alwaysNull == other.alwaysNull && this.nonNull == other.nonNull; } @Override public Constant asConstant() { if (alwaysNull) { return JavaConstant.NULL_POINTER; } else { return null; } } @Override public Kind getStackKind() { return Kind.Illegal; } }