Mercurial > hg > truffle
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/memory/address/OffsetAddressNode.java @ 21783:a858c5f56d8a
Introduce AddressNode to represent pointer arithmetic, remove LocationNode.
author | Roland Schatz <roland.schatz@oracle.com> |
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date | Mon, 08 Jun 2015 18:47:58 +0200 |
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/* * Copyright (c) 2015, 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.nodes.memory.address; import com.oracle.graal.compiler.common.type.*; import com.oracle.graal.graph.*; import com.oracle.graal.graph.spi.*; import com.oracle.graal.nodeinfo.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.calc.*; import com.oracle.graal.nodes.spi.*; import com.oracle.graal.nodes.type.*; import com.oracle.jvmci.meta.*; /** * Represents an address that is composed of a base and an offset. The base can be either a * {@link Kind#Object}, a word-sized integer or another pointer. The offset must be a word-sized * integer. */ @NodeInfo(allowedUsageTypes = InputType.Association) public class OffsetAddressNode extends AddressNode implements Canonicalizable, PiPushable { public static final NodeClass<OffsetAddressNode> TYPE = NodeClass.create(OffsetAddressNode.class); @Input ValueNode base; @Input ValueNode offset; public OffsetAddressNode(ValueNode base, ValueNode offset) { super(TYPE); this.base = base; this.offset = offset; } public ValueNode getBase() { return base; } public void setBase(ValueNode base) { updateUsages(this.base, base); this.base = base; } public ValueNode getOffset() { return offset; } public void setOffset(ValueNode offset) { updateUsages(this.offset, offset); this.offset = offset; } public Node canonical(CanonicalizerTool tool) { if (base instanceof RawAddressNode) { // The RawAddressNode is redundant, just directly use its input as base. return new OffsetAddressNode(((RawAddressNode) base).getAddress(), offset); } else if (base instanceof OffsetAddressNode) { // Rewrite (&base[offset1])[offset2] to base[offset1 + offset2]. OffsetAddressNode b = (OffsetAddressNode) base; return new OffsetAddressNode(b.getBase(), BinaryArithmeticNode.add(b.getOffset(), this.getOffset())); } else { return this; } } @Override public boolean push(PiNode parent) { if (!(offset.isConstant() && parent.stamp() instanceof ObjectStamp && parent.object().stamp() instanceof ObjectStamp)) { return false; } ObjectStamp piStamp = (ObjectStamp) parent.stamp(); ResolvedJavaType receiverType = piStamp.type(); if (receiverType == null) { return false; } ResolvedJavaField field = receiverType.findInstanceFieldWithOffset(offset.asJavaConstant().asLong(), Kind.Void); if (field == null) { // field was not declared by receiverType return false; } ObjectStamp valueStamp = (ObjectStamp) parent.object().stamp(); ResolvedJavaType valueType = StampTool.typeOrNull(valueStamp); if (valueType != null && field.getDeclaringClass().isAssignableFrom(valueType)) { if (piStamp.nonNull() == valueStamp.nonNull() && piStamp.alwaysNull() == valueStamp.alwaysNull()) { replaceFirstInput(parent, parent.object()); return true; } } return false; } @NodeIntrinsic public static native Address address(Object base, long offset); }