Mercurial > hg > truffle
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/extended/UnsafeAccessNode.java @ 11959:23ccaa863eda
made CodeCacheProvider independent of MetaAccessProvider (GRAAL-511)
author | Doug Simon <doug.simon@oracle.com> |
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date | Thu, 10 Oct 2013 16:14:55 +0200 |
parents | 88fb9cba8751 |
children | b1e7e4ffead1 |
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/* * Copyright (c) 2012, 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.nodes.extended; import com.oracle.graal.api.meta.*; import com.oracle.graal.graph.*; import com.oracle.graal.graph.spi.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.type.*; public abstract class UnsafeAccessNode extends FixedWithNextNode implements Canonicalizable { @Input private ValueNode object; @Input private ValueNode offset; private final Kind accessKind; private final LocationIdentity locationIdentity; public UnsafeAccessNode(Stamp stamp, ValueNode object, ValueNode offset, Kind accessKind, LocationIdentity locationIdentity) { super(stamp); assert accessKind != null; this.object = object; this.offset = offset; this.accessKind = accessKind; this.locationIdentity = locationIdentity; } public LocationIdentity getLocationIdentity() { return locationIdentity; } public ValueNode object() { return object; } public ValueNode offset() { return offset; } public Kind accessKind() { return accessKind; } @Override public Node canonical(CanonicalizerTool tool) { if (this.getLocationIdentity() == LocationIdentity.ANY_LOCATION && offset().isConstant()) { long constantOffset = offset().asConstant().asLong(); // Try to canonicalize to a field access. ResolvedJavaType receiverType = ObjectStamp.typeOrNull(object()); if (receiverType != null) { ResolvedJavaField field = receiverType.findInstanceFieldWithOffset(constantOffset); // No need for checking that the receiver is non-null. The field access includes // the null check and if a field is found, the offset is so small that this is // never a valid access of an arbitrary address. if (field != null && field.getKind() == this.accessKind()) { return cloneAsFieldAccess(field); } } } return this; } protected abstract ValueNode cloneAsFieldAccess(ResolvedJavaField field); }