Mercurial > hg > truffle
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/ObjectEqualsNode.java @ 21543:93c50cefb9e8
moved GraalInternalError to com.oracle.jvmci.common and renamed it to JVMCIError (JBS:GRAAL-53)
author | Doug Simon <doug.simon@oracle.com> |
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date | Mon, 25 May 2015 23:30:34 +0200 |
parents | a927a3ccfd0d |
children | 48c1ebd24120 |
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/* * Copyright (c) 2011, 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.calc; import com.oracle.graal.api.meta.*; import com.oracle.graal.compiler.common.calc.*; 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.extended.*; import com.oracle.graal.nodes.java.*; import com.oracle.graal.nodes.spi.*; import com.oracle.jvmci.common.*; @NodeInfo(shortName = "==") public final class ObjectEqualsNode extends PointerEqualsNode implements Virtualizable { public static final NodeClass<ObjectEqualsNode> TYPE = NodeClass.create(ObjectEqualsNode.class); public ObjectEqualsNode(ValueNode x, ValueNode y) { super(TYPE, x, y); assert x.stamp() instanceof AbstractObjectStamp; assert y.stamp() instanceof AbstractObjectStamp; } public static LogicNode create(ValueNode x, ValueNode y, ConstantReflectionProvider constantReflection) { LogicNode result = CompareNode.tryConstantFold(Condition.EQ, x, y, constantReflection, false); if (result != null) { return result; } else { result = findSynonym(x, y); if (result != null) { return result; } return new ObjectEqualsNode(x, y); } } @Override protected ValueNode canonicalizeSymmetricConstant(CanonicalizerTool tool, Constant constant, ValueNode nonConstant, boolean mirrored) { ResolvedJavaType type = tool.getConstantReflection().asJavaType(constant); if (type != null && nonConstant instanceof GetClassNode) { if (!type.isPrimitive() && (type.isConcrete() || type.isArray())) { return TypeCheckNode.create(type, ((GetClassNode) nonConstant).getObject()); } return LogicConstantNode.forBoolean(false); } return super.canonicalizeSymmetricConstant(tool, constant, nonConstant, mirrored); } private void virtualizeNonVirtualComparison(State state, ValueNode other, VirtualizerTool tool) { if (!state.getVirtualObject().hasIdentity() && state.getVirtualObject().entryKind(0) == Kind.Boolean) { if (other.isConstant()) { JavaConstant otherUnboxed = tool.getConstantReflectionProvider().unboxPrimitive(other.asJavaConstant()); if (otherUnboxed != null && otherUnboxed.getKind() == Kind.Boolean) { int expectedValue = otherUnboxed.asBoolean() ? 1 : 0; IntegerEqualsNode equals = new IntegerEqualsNode(state.getEntry(0), ConstantNode.forInt(expectedValue, graph())); tool.addNode(equals); tool.replaceWithValue(equals); } else { tool.replaceWithValue(LogicConstantNode.contradiction(graph())); } } } else { // one of them is virtual: they can never be the same objects tool.replaceWithValue(LogicConstantNode.contradiction(graph())); } } @Override public void virtualize(VirtualizerTool tool) { State stateX = tool.getObjectState(getX()); State stateY = tool.getObjectState(getY()); boolean xVirtual = stateX != null && stateX.getState() == EscapeState.Virtual; boolean yVirtual = stateY != null && stateY.getState() == EscapeState.Virtual; if (xVirtual && !yVirtual) { virtualizeNonVirtualComparison(stateX, stateY != null ? stateY.getMaterializedValue() : getY(), tool); } else if (!xVirtual && yVirtual) { virtualizeNonVirtualComparison(stateY, stateX != null ? stateX.getMaterializedValue() : getX(), tool); } else if (xVirtual && yVirtual) { boolean xIdentity = stateX.getVirtualObject().hasIdentity(); boolean yIdentity = stateY.getVirtualObject().hasIdentity(); if (xIdentity ^ yIdentity) { /* * One of the two objects has identity, the other doesn't. In code, this looks like * "Integer.valueOf(a) == new Integer(b)", which is always false. * * In other words: an object created via valueOf can never be equal to one created * by new in the same compilation unit. */ tool.replaceWithValue(LogicConstantNode.contradiction(graph())); } else if (!xIdentity && !yIdentity) { ResolvedJavaType type = stateX.getVirtualObject().type(); if (type.equals(stateY.getVirtualObject().type())) { MetaAccessProvider metaAccess = tool.getMetaAccessProvider(); if (type.equals(metaAccess.lookupJavaType(Integer.class)) || type.equals(metaAccess.lookupJavaType(Long.class))) { // both are virtual without identity: check contents assert stateX.getVirtualObject().entryCount() == 1 && stateY.getVirtualObject().entryCount() == 1; assert stateX.getVirtualObject().entryKind(0).getStackKind() == Kind.Int || stateX.getVirtualObject().entryKind(0) == Kind.Long; IntegerEqualsNode equals = new IntegerEqualsNode(stateX.getEntry(0), stateY.getEntry(0)); tool.addNode(equals); tool.replaceWithValue(equals); } } } else { // both are virtual with identity: check if they refer to the same object tool.replaceWithValue(LogicConstantNode.forBoolean(stateX == stateY, graph())); } } } @Override protected CompareNode duplicateModified(ValueNode newX, ValueNode newY) { if (newX.stamp() instanceof ObjectStamp && newY.stamp() instanceof ObjectStamp) { return new ObjectEqualsNode(newX, newY); } else if (newX.stamp() instanceof AbstractPointerStamp && newY.stamp() instanceof AbstractPointerStamp) { return new PointerEqualsNode(newX, newY); } throw JVMCIError.shouldNotReachHere(); } }