Mercurial > hg > graal-compiler
view graal/com.oracle.graal.compiler.common/src/com/oracle/graal/compiler/common/type/VoidStamp.java @ 20110:51f2e71b57aa
Improvements to the Stamp infrastructure. New methods Stamp#improveWith, Stamp#tryImproveWith, Stamp#isIllegal.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Wed, 01 Apr 2015 16:36:15 +0200 |
parents | 5ea169a3bf81 |
children | 7b0ff8da6057 |
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/* * Copyright (c) 2014, 2014, 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.graal.api.meta.*; import com.oracle.graal.compiler.common.*; import com.oracle.graal.compiler.common.spi.*; /** * Singleton stamp representing the value of type {@code void}. */ public final class VoidStamp extends Stamp { private VoidStamp() { } @Override public Stamp unrestricted() { return this; } @Override public Kind getStackKind() { return Kind.Void; } @Override public Stamp improveWith(Stamp other) { if (other instanceof VoidStamp) { return this; } return StampFactory.illegal(Kind.Illegal); } @Override public LIRKind getLIRKind(LIRKindTool tool) { throw GraalInternalError.shouldNotReachHere("void stamp has no value"); } @Override public ResolvedJavaType javaType(MetaAccessProvider metaAccess) { return metaAccess.lookupJavaType(Void.TYPE); } @Override public String toString() { return "void"; } @Override public boolean alwaysDistinct(Stamp other) { return this != other; } @Override public Stamp meet(Stamp other) { if (other instanceof IllegalStamp) { return other.join(this); } if (this == other) { return this; } return StampFactory.illegal(Kind.Illegal); } @Override public Stamp join(Stamp other) { if (other instanceof IllegalStamp) { return other.join(this); } if (this == other) { return this; } return StampFactory.illegal(Kind.Illegal); } @Override public boolean isCompatible(Stamp stamp) { return this == stamp; } @Override public Stamp illegal() { // there is no illegal void stamp return this; } @Override public boolean isLegal() { return true; } @Override public Constant readConstant(MemoryAccessProvider provider, Constant base, long displacement) { throw GraalInternalError.shouldNotReachHere("can't read values of void stamp"); } @Override public Stamp constant(Constant c, MetaAccessProvider meta) { throw GraalInternalError.shouldNotReachHere("void stamp has no value"); } private static final VoidStamp instance = new VoidStamp(); static VoidStamp getInstance() { return instance; } }