| /* |
| * Copyright (c) 2012, 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 org.graalvm.compiler.core.common.type; |
| |
| import org.graalvm.compiler.core.common.LIRKind; |
| import org.graalvm.compiler.core.common.spi.LIRKindTool; |
| import org.graalvm.compiler.debug.GraalError; |
| |
| import jdk.vm.ci.meta.Constant; |
| import jdk.vm.ci.meta.JavaKind; |
| import jdk.vm.ci.meta.MemoryAccessProvider; |
| import jdk.vm.ci.meta.MetaAccessProvider; |
| import jdk.vm.ci.meta.PrimitiveConstant; |
| import jdk.vm.ci.meta.ResolvedJavaType; |
| |
| /** |
| * This stamp represents the type of the {@link JavaKind#Illegal} value in the second slot of |
| * {@link JavaKind#Long} and {@link JavaKind#Double} values. It can only appear in framestates or |
| * virtual objects. |
| */ |
| public final class IllegalStamp extends Stamp { |
| |
| private IllegalStamp() { |
| } |
| |
| @Override |
| public JavaKind getStackKind() { |
| return JavaKind.Illegal; |
| } |
| |
| @Override |
| public LIRKind getLIRKind(LIRKindTool tool) { |
| return LIRKind.Illegal; |
| } |
| |
| @Override |
| public Stamp unrestricted() { |
| return this; |
| } |
| |
| @Override |
| public Stamp empty() { |
| return this; |
| } |
| |
| @Override |
| public Stamp constant(Constant c, MetaAccessProvider meta) { |
| assert ((PrimitiveConstant) c).getJavaKind() == JavaKind.Illegal; |
| return this; |
| } |
| |
| @Override |
| public ResolvedJavaType javaType(MetaAccessProvider metaAccess) { |
| throw GraalError.shouldNotReachHere("illegal stamp has no Java type"); |
| } |
| |
| @Override |
| public Stamp meet(Stamp other) { |
| assert other instanceof IllegalStamp; |
| return this; |
| } |
| |
| @Override |
| public Stamp join(Stamp other) { |
| assert other instanceof IllegalStamp; |
| return this; |
| } |
| |
| @Override |
| public boolean isCompatible(Stamp stamp) { |
| return stamp instanceof IllegalStamp; |
| } |
| |
| @Override |
| public boolean isCompatible(Constant constant) { |
| if (constant instanceof PrimitiveConstant) { |
| PrimitiveConstant prim = (PrimitiveConstant) constant; |
| return prim.getJavaKind() == JavaKind.Illegal; |
| } |
| return false; |
| } |
| |
| @Override |
| public String toString() { |
| return "ILLEGAL"; |
| } |
| |
| @Override |
| public boolean hasValues() { |
| return true; |
| } |
| |
| @Override |
| public Stamp improveWith(Stamp other) { |
| assert other instanceof IllegalStamp; |
| return this; |
| } |
| |
| @Override |
| public Constant readConstant(MemoryAccessProvider provider, Constant base, long displacement) { |
| throw GraalError.shouldNotReachHere("can't read values of illegal stamp"); |
| } |
| |
| private static final IllegalStamp instance = new IllegalStamp(); |
| |
| static IllegalStamp getInstance() { |
| return instance; |
| } |
| } |