Mercurial > hg > truffle
view graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/replacements/HubGetClassNode.java @ 21526:1da7aef31a08
created com.oracle.graal.hotspot.jvmci package and moved classes destined for future JVMCI module into it (JBS:GRAAL-53)
author | Doug Simon <doug.simon@oracle.com> |
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date | Tue, 19 May 2015 23:16:07 +0200 |
parents | a4aa2116cfe0 |
children | 5324104ac4f3 |
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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.hotspot.replacements; import com.oracle.graal.api.meta.*; import com.oracle.graal.compiler.common.type.*; import com.oracle.graal.graph.*; import com.oracle.graal.graph.spi.*; import com.oracle.graal.hotspot.jvmci.*; import com.oracle.graal.hotspot.word.*; import com.oracle.graal.nodeinfo.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.calc.*; import com.oracle.graal.nodes.spi.*; /** * Read {@code Klass::_java_mirror} and incorporate non-null type information into stamp. This is * also used by {@link ClassGetHubNode} to eliminate chains of {@code klass._java_mirror._klass}. */ @NodeInfo public final class HubGetClassNode extends FloatingGuardedNode implements Lowerable, Canonicalizable, ConvertNode { public static final NodeClass<HubGetClassNode> TYPE = NodeClass.create(HubGetClassNode.class); @Input protected ValueNode hub; public HubGetClassNode(@InjectedNodeParameter MetaAccessProvider metaAccess, ValueNode hub) { super(TYPE, StampFactory.declaredNonNull(metaAccess.lookupJavaType(Class.class)), null); this.hub = hub; } public ValueNode getHub() { return hub; } @Override public Node canonical(CanonicalizerTool tool) { if (tool.allUsagesAvailable() && hasNoUsages()) { return null; } else { MetaAccessProvider metaAccess = tool.getMetaAccess(); if (metaAccess != null) { if (hub.isConstant()) { ResolvedJavaType exactType = tool.getConstantReflection().asJavaType(hub.asJavaConstant()); return ConstantNode.forConstant(exactType.getJavaClass(), metaAccess); } } return this; } } @Override public void lower(LoweringTool tool) { tool.getLowerer().lower(this, tool); } @NodeIntrinsic public static native Class<?> readClass(KlassPointer hub); @Override public ValueNode getValue() { return hub; } @Override public Constant convert(Constant c, ConstantReflectionProvider constantReflection) { if (JavaConstant.NULL_POINTER.equals(c)) { return c; } return constantReflection.asJavaType(c).getJavaClass(); } @Override public Constant reverse(Constant c, ConstantReflectionProvider constantReflection) { if (JavaConstant.NULL_POINTER.equals(c)) { return c; } ResolvedJavaType type = constantReflection.asJavaType(c); if (type instanceof HotSpotResolvedObjectType) { return ((HotSpotResolvedObjectType) type).getObjectHub(); } else { assert type instanceof HotSpotResolvedPrimitiveType; return JavaConstant.NULL_POINTER; } } @Override public boolean isLossless() { /* * Any concrete Klass* has a corresponding java.lang.Class */ return true; } }