Mercurial > hg > truffle
view graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/replacements/ClassGetHubNode.java @ 21783:a858c5f56d8a
Introduce AddressNode to represent pointer arithmetic, remove LocationNode.
author | Roland Schatz <roland.schatz@oracle.com> |
---|---|
date | Mon, 08 Jun 2015 18:47:58 +0200 |
parents | 48c1ebd24120 |
children |
line wrap: on
line source
/* * 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.compiler.common.calc.*; import com.oracle.graal.graph.*; import com.oracle.graal.graph.spi.*; import com.oracle.graal.hotspot.nodes.type.*; 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.extended.*; import com.oracle.graal.nodes.memory.*; import com.oracle.graal.nodes.memory.address.*; import com.oracle.graal.nodes.spi.*; import com.oracle.jvmci.hotspot.*; import com.oracle.jvmci.meta.*; /** * Read {@code Class::_klass} to get the hub for a {@link java.lang.Class}. This node mostly exists * to replace {@code _klass._java_mirror._klass} with {@code _klass}. The constant folding could be * handled by * {@link ReadNode#canonicalizeRead(ValueNode, AddressNode, LocationIdentity, CanonicalizerTool)}. */ @NodeInfo public final class ClassGetHubNode extends FloatingGuardedNode implements Lowerable, Canonicalizable, ConvertNode { public static final NodeClass<ClassGetHubNode> TYPE = NodeClass.create(ClassGetHubNode.class); @Input protected ValueNode clazz; public ClassGetHubNode(ValueNode clazz) { this(clazz, null); } public ClassGetHubNode(ValueNode clazz, ValueNode guard) { super(TYPE, KlassPointerStamp.klass(), (GuardingNode) guard); this.clazz = clazz; } @Override public Node canonical(CanonicalizerTool tool) { if (tool.allUsagesAvailable() && hasNoUsages()) { return null; } else { if (clazz.isConstant()) { MetaAccessProvider metaAccess = tool.getMetaAccess(); if (metaAccess != null) { ResolvedJavaType exactType = tool.getConstantReflection().asJavaType(clazz.asJavaConstant()); if (exactType instanceof HotSpotResolvedObjectType) { HotSpotResolvedObjectType objectType = (HotSpotResolvedObjectType) exactType; ConstantNode cn = ConstantNode.forConstant(stamp(), objectType.getObjectHub(), metaAccess); return cn; } else if (exactType instanceof HotSpotResolvedPrimitiveType) { return ConstantNode.forConstant(stamp(), JavaConstant.NULL_POINTER, metaAccess); } } } if (clazz instanceof GetClassNode) { GetClassNode getClass = (GetClassNode) clazz; return new LoadHubNode(KlassPointerStamp.klassNonNull(), getClass.getObject(), null); } if (clazz instanceof HubGetClassNode) { // replace _klass._java_mirror._klass -> _klass return ((HubGetClassNode) clazz).getHub(); } return this; } } @Override public void lower(LoweringTool tool) { tool.getLowerer().lower(this, tool); } @NodeIntrinsic public static native KlassPointer readClass(Class<?> clazz); @NodeIntrinsic public static native KlassPointer readClass(Class<?> clazz, GuardingNode guard); public ValueNode getValue() { return clazz; } @Override public Constant convert(Constant c, ConstantReflectionProvider constantReflection) { ResolvedJavaType exactType = constantReflection.asJavaType(c); if (exactType instanceof HotSpotResolvedObjectType) { HotSpotResolvedObjectType objectType = (HotSpotResolvedObjectType) exactType; return objectType.getObjectHub(); } else { assert exactType instanceof HotSpotResolvedPrimitiveType; return JavaConstant.NULL_POINTER; } } @Override public Constant reverse(Constant c, ConstantReflectionProvider constantReflection) { assert !c.equals(JavaConstant.NULL_POINTER); ResolvedJavaType objectType = constantReflection.asJavaType(c); return objectType.getJavaClass(); } public boolean isLossless() { return false; } @Override public boolean preservesOrder(Condition op, Constant value, ConstantReflectionProvider constantReflection) { assert op == Condition.EQ || op == Condition.NE; ResolvedJavaType exactType = constantReflection.asJavaType(value); return exactType instanceof HotSpotResolvedObjectType; } }