Mercurial > hg > graal-jvmci-8
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/extended/ReadNode.java @ 9276:a9cfbe03d9c4
don't pushThroughPi if nullness before/after pi differs
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Tue, 23 Apr 2013 21:03:47 +0200 |
parents | f78437ffb8d3 |
children | 9ee5f3bfa755 |
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/* * Copyright (c) 2011, 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 java.util.*; import com.oracle.graal.api.meta.*; import com.oracle.graal.graph.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.spi.*; import com.oracle.graal.nodes.type.*; /** * Reads an {@linkplain AccessNode accessed} value. */ public final class ReadNode extends FloatableAccessNode implements Node.IterableNodeType, LIRLowerable, Canonicalizable, PiPushable { public ReadNode(ValueNode object, ValueNode location, Stamp stamp) { super(object, location, stamp); } public ReadNode(ValueNode object, ValueNode location, Stamp stamp, List<ValueNode> dependencies) { super(object, location, stamp, dependencies); } private ReadNode(ValueNode object, int displacement, Object locationIdentity, Kind kind) { super(object, ConstantLocationNode.create(locationIdentity, kind, displacement, object.graph()), StampFactory.forKind(kind)); } private ReadNode(ValueNode object, ValueNode location, ValueNode dependency) { /* * Used by node intrinsics. Since the initial value for location is a parameter, i.e., a * LocalNode, the constructor cannot use the declared type LocationNode. */ super(object, location, StampFactory.forNodeIntrinsic(), dependency); } @Override public void generate(LIRGeneratorTool gen) { gen.setResult(this, location().generateLoad(gen, gen.operand(object()), this)); } @Override public ValueNode canonical(CanonicalizerTool tool) { return canonicalizeRead(this, location(), object(), tool); } @Override public FloatingAccessNode asFloatingNode(ValueNode lastLocationAccess) { return graph().unique(new FloatingReadNode(object(), location(), lastLocationAccess, stamp(), dependencies())); } public static ValueNode canonicalizeRead(ValueNode read, LocationNode location, ValueNode object, CanonicalizerTool tool) { MetaAccessProvider runtime = tool.runtime(); if (runtime != null && object != null && object.isConstant()) { if (location.locationIdentity() == LocationNode.FINAL_LOCATION && location instanceof ConstantLocationNode) { long displacement = ((ConstantLocationNode) location).displacement(); Kind kind = location.getValueKind(); if (object.kind() == Kind.Object) { Object base = object.asConstant().asObject(); if (base != null) { Constant constant = tool.runtime().readUnsafeConstant(kind, base, displacement); if (constant != null) { return ConstantNode.forConstant(constant, runtime, read.graph()); } } } else if (object.kind() == Kind.Long || object.kind().getStackKind() == Kind.Int) { long base = object.asConstant().asLong(); if (base != 0L) { Constant constant = tool.runtime().readUnsafeConstant(kind, null, base + displacement); if (constant != null) { return ConstantNode.forConstant(constant, runtime, read.graph()); } } } } } return read; } @Override public boolean push(PiNode parent) { Object locId = location().locationIdentity(); if (locId instanceof ResolvedJavaField) { ResolvedJavaType fieldType = ((ResolvedJavaField) locId).getDeclaringClass(); ValueNode piValueStamp = parent.object(); ResolvedJavaType beforePiType = piValueStamp.objectStamp().type(); if (beforePiType != null && fieldType.isAssignableFrom(beforePiType)) { ObjectStamp piStamp = parent.objectStamp(); if (piStamp.nonNull() == piValueStamp.objectStamp().nonNull() && piStamp.alwaysNull() == piValueStamp.objectStamp().alwaysNull()) { replaceFirstInput(parent, piValueStamp); return true; } } } return false; } /** * Reads a value from memory. * * @param base the base pointer for the memory access * @param displacement the displacement of the access * @param locationIdentity the identity of the access * @param kind the kind of the value read * @return the value read from memory */ @NodeIntrinsic(setStampFromReturnType = true) public static native <T> T read(Object base, @ConstantNodeParameter int displacement, @ConstantNodeParameter Object locationIdentity, @ConstantNodeParameter Kind kind); }