Mercurial > hg > truffle
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/GuardingPiNode.java @ 19962:9b669776bf8a
added null checking for the receiver when inlining or applying an InvocationPlugin during graph parsing
author | Doug Simon <doug.simon@oracle.com> |
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date | Thu, 19 Mar 2015 22:31:42 +0100 |
parents | 14e703edb2ab |
children | 343021aacd2f |
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/* * Copyright (c) 2012, 2013, 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; import com.oracle.graal.api.meta.*; 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.calc.*; import com.oracle.graal.nodes.extended.*; import com.oracle.graal.nodes.spi.*; import com.oracle.graal.nodes.type.*; /** * A node that changes the stamp of its input based on some condition being true. */ @NodeInfo(nameTemplate = "GuardingPi(!={p#negated}) {p#reason/s}") public final class GuardingPiNode extends FixedWithNextNode implements Lowerable, Virtualizable, Canonicalizable, ValueProxy { public static final NodeClass<GuardingPiNode> TYPE = NodeClass.create(GuardingPiNode.class); @Input ValueNode object; @Input(InputType.Condition) LogicNode condition; protected final DeoptimizationReason reason; protected final DeoptimizationAction action; protected final Stamp piStamp; protected boolean negated; public ValueNode object() { return object; } public LogicNode condition() { return condition; } public boolean isNegated() { return negated; } public DeoptimizationReason getReason() { return reason; } public DeoptimizationAction getAction() { return action; } public GuardingPiNode(ValueNode object) { this(object, object.graph().unique(new IsNullNode(object)), true, DeoptimizationReason.NullCheckException, DeoptimizationAction.None, object.stamp().join(StampFactory.objectNonNull())); } public GuardingPiNode(ValueNode object, ValueNode condition, boolean negateCondition, DeoptimizationReason reason, DeoptimizationAction action, Stamp stamp) { super(TYPE, stamp); assert stamp != null; this.piStamp = stamp; this.object = object; this.condition = (LogicNode) condition; this.reason = reason; this.action = action; this.negated = negateCondition; } @Override public void lower(LoweringTool tool) { GuardingNode guard = tool.createGuard(next(), condition, reason, action, negated); ValueAnchorNode anchor = graph().add(new ValueAnchorNode((ValueNode) guard)); if (usages().isNotEmpty()) { PiNode pi = graph().unique(new PiNode(object, stamp(), (ValueNode) guard)); replaceAtUsages(pi); } graph().replaceFixedWithFixed(this, anchor); } @Override public void virtualize(VirtualizerTool tool) { State state = tool.getObjectState(object); if (state != null && state.getState() == EscapeState.Virtual && StampTool.typeOrNull(this) != null && StampTool.typeOrNull(this).isAssignableFrom(state.getVirtualObject().type())) { tool.replaceWithVirtual(state.getVirtualObject()); } } @Override public boolean inferStamp() { return updateStamp(piStamp.join(object().stamp())); } @Override public Node canonical(CanonicalizerTool tool) { if (stamp() == StampFactory.illegal(object.getKind())) { // The guard always fails return new DeoptimizeNode(action, reason); } if (condition instanceof LogicConstantNode) { LogicConstantNode c = (LogicConstantNode) condition; if (c.getValue() == negated) { // The guard always fails return new DeoptimizeNode(action, reason); } else if (stamp().equals(object().stamp())) { // The guard always succeeds, and does not provide new type information return object; } else { // The guard always succeeds, and provides new type information return new PiNode(object, stamp()); } } return this; } @NodeIntrinsic public static native Object guardingNonNull(Object object); @Override public ValueNode getOriginalNode() { return object; } /** * Casts a value to have an exact, non-null stamp representing {@link Class} that is guarded by * a null check. */ @NodeIntrinsic(GuardingPiNode.class) public static native Class<?> asNonNullClass(Class<?> c); }