| /* |
| * Copyright (c) 2009, 2016, 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 org.graalvm.compiler.nodes.java; |
| |
| import static org.graalvm.compiler.graph.iterators.NodePredicates.isNotA; |
| import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_2; |
| |
| import org.graalvm.compiler.core.common.spi.ConstantFieldProvider; |
| import org.graalvm.compiler.core.common.type.Stamp; |
| import org.graalvm.compiler.core.common.type.StampFactory; |
| import org.graalvm.compiler.core.common.type.StampPair; |
| import org.graalvm.compiler.graph.NodeClass; |
| import org.graalvm.compiler.graph.spi.Canonicalizable; |
| import org.graalvm.compiler.graph.spi.CanonicalizerTool; |
| import org.graalvm.compiler.nodeinfo.NodeCycles; |
| import org.graalvm.compiler.nodeinfo.NodeInfo; |
| import org.graalvm.compiler.nodes.ConstantNode; |
| import org.graalvm.compiler.nodes.DeoptimizeNode; |
| import org.graalvm.compiler.nodes.NodeView; |
| import org.graalvm.compiler.nodes.PhiNode; |
| import org.graalvm.compiler.nodes.ValueNode; |
| import org.graalvm.compiler.nodes.ValuePhiNode; |
| import org.graalvm.compiler.nodes.spi.UncheckedInterfaceProvider; |
| import org.graalvm.compiler.nodes.spi.Virtualizable; |
| import org.graalvm.compiler.nodes.spi.VirtualizerTool; |
| import org.graalvm.compiler.nodes.type.StampTool; |
| import org.graalvm.compiler.nodes.util.ConstantFoldUtil; |
| import org.graalvm.compiler.nodes.virtual.VirtualInstanceNode; |
| import org.graalvm.compiler.nodes.virtual.VirtualObjectNode; |
| import org.graalvm.compiler.options.OptionValues; |
| |
| import jdk.vm.ci.meta.Assumptions; |
| import jdk.vm.ci.meta.ConstantReflectionProvider; |
| import jdk.vm.ci.meta.DeoptimizationAction; |
| import jdk.vm.ci.meta.DeoptimizationReason; |
| import jdk.vm.ci.meta.JavaConstant; |
| import jdk.vm.ci.meta.JavaKind; |
| import jdk.vm.ci.meta.MetaAccessProvider; |
| import jdk.vm.ci.meta.ResolvedJavaField; |
| |
| /** |
| * The {@code LoadFieldNode} represents a read of a static or instance field. |
| */ |
| @NodeInfo(nameTemplate = "LoadField#{p#field/s}") |
| public final class LoadFieldNode extends AccessFieldNode implements Canonicalizable.Unary<ValueNode>, Virtualizable, UncheckedInterfaceProvider { |
| |
| public static final NodeClass<LoadFieldNode> TYPE = NodeClass.create(LoadFieldNode.class); |
| |
| private final Stamp uncheckedStamp; |
| |
| protected LoadFieldNode(StampPair stamp, ValueNode object, ResolvedJavaField field) { |
| this(stamp, object, field, field.isVolatile()); |
| } |
| |
| protected LoadFieldNode(StampPair stamp, ValueNode object, ResolvedJavaField field, boolean volatileAccess) { |
| super(TYPE, stamp.getTrustedStamp(), object, field, volatileAccess); |
| this.uncheckedStamp = stamp.getUncheckedStamp(); |
| } |
| |
| public static LoadFieldNode create(Assumptions assumptions, ValueNode object, ResolvedJavaField field) { |
| return create(assumptions, object, field, field.isVolatile()); |
| } |
| |
| public static LoadFieldNode create(Assumptions assumptions, ValueNode object, ResolvedJavaField field, boolean volatileAccess) { |
| return new LoadFieldNode(StampFactory.forDeclaredType(assumptions, field.getType(), false), object, field, volatileAccess); |
| } |
| |
| public static ValueNode create(ConstantFieldProvider constantFields, ConstantReflectionProvider constantReflection, MetaAccessProvider metaAccess, |
| OptionValues options, Assumptions assumptions, ValueNode object, ResolvedJavaField field, boolean canonicalizeReads, boolean allUsagesAvailable) { |
| return canonical(null, StampFactory.forDeclaredType(assumptions, field.getType(), false), object, |
| field, constantFields, constantReflection, options, metaAccess, canonicalizeReads, allUsagesAvailable); |
| } |
| |
| public static LoadFieldNode createOverrideStamp(StampPair stamp, ValueNode object, ResolvedJavaField field) { |
| return new LoadFieldNode(stamp, object, field); |
| } |
| |
| public static ValueNode createOverrideStamp(ConstantFieldProvider constantFields, ConstantReflectionProvider constantReflection, MetaAccessProvider metaAccess, |
| OptionValues options, StampPair stamp, ValueNode object, ResolvedJavaField field, boolean canonicalizeReads, boolean allUsagesAvailable) { |
| return canonical(null, stamp, object, field, constantFields, constantReflection, options, metaAccess, canonicalizeReads, allUsagesAvailable); |
| } |
| |
| @Override |
| public ValueNode getValue() { |
| return object(); |
| } |
| |
| @Override |
| public ValueNode canonical(CanonicalizerTool tool, ValueNode forObject) { |
| NodeView view = NodeView.from(tool); |
| if (tool.allUsagesAvailable() && hasNoUsages() && !isVolatile() && (isStatic() || StampTool.isPointerNonNull(forObject.stamp(view)))) { |
| return null; |
| } |
| return canonical(this, StampPair.create(stamp, uncheckedStamp), forObject, field, tool.getConstantFieldProvider(), |
| tool.getConstantReflection(), tool.getOptions(), tool.getMetaAccess(), tool.canonicalizeReads(), tool.allUsagesAvailable()); |
| } |
| |
| private static ValueNode canonical(LoadFieldNode loadFieldNode, StampPair stamp, ValueNode forObject, ResolvedJavaField field, |
| ConstantFieldProvider constantFields, ConstantReflectionProvider constantReflection, |
| OptionValues options, MetaAccessProvider metaAccess, boolean canonicalizeReads, boolean allUsagesAvailable) { |
| LoadFieldNode self = loadFieldNode; |
| if (canonicalizeReads && metaAccess != null) { |
| ConstantNode constant = asConstant(constantFields, constantReflection, metaAccess, options, forObject, field); |
| if (constant != null) { |
| return constant; |
| } |
| if (allUsagesAvailable) { |
| PhiNode phi = asPhi(constantFields, constantReflection, metaAccess, options, forObject, |
| field, stamp.getTrustedStamp()); |
| if (phi != null) { |
| return phi; |
| } |
| } |
| } |
| if (self != null && !field.isStatic() && forObject.isNullConstant()) { |
| return new DeoptimizeNode(DeoptimizationAction.InvalidateReprofile, DeoptimizationReason.NullCheckException); |
| } |
| if (self == null) { |
| self = new LoadFieldNode(stamp, forObject, field); |
| } |
| return self; |
| } |
| |
| /** |
| * Gets a constant value for this load if possible. |
| */ |
| public ConstantNode asConstant(CanonicalizerTool tool, ValueNode forObject) { |
| return asConstant(tool.getConstantFieldProvider(), tool.getConstantReflection(), |
| tool.getMetaAccess(), tool.getOptions(), forObject, field); |
| } |
| |
| private static ConstantNode asConstant(ConstantFieldProvider constantFields, ConstantReflectionProvider constantReflection, |
| MetaAccessProvider metaAccess, OptionValues options, ValueNode forObject, ResolvedJavaField field) { |
| if (field.isStatic()) { |
| return ConstantFoldUtil.tryConstantFold(constantFields, constantReflection, metaAccess, field, null, options); |
| } else if (forObject.isConstant() && !forObject.isNullConstant()) { |
| return ConstantFoldUtil.tryConstantFold(constantFields, constantReflection, metaAccess, field, forObject.asJavaConstant(), options); |
| } |
| return null; |
| } |
| |
| public ConstantNode asConstant(CanonicalizerTool tool, JavaConstant constant) { |
| return ConstantFoldUtil.tryConstantFold(tool.getConstantFieldProvider(), tool.getConstantReflection(), tool.getMetaAccess(), field(), constant, tool.getOptions()); |
| } |
| |
| private static PhiNode asPhi(ConstantFieldProvider constantFields, ConstantReflectionProvider constantReflection, |
| MetaAccessProvider metaAcccess, OptionValues options, ValueNode forObject, ResolvedJavaField field, Stamp stamp) { |
| if (!field.isStatic() && field.isFinal() && forObject instanceof ValuePhiNode && ((ValuePhiNode) forObject).values().filter(isNotA(ConstantNode.class)).isEmpty()) { |
| PhiNode phi = (PhiNode) forObject; |
| ConstantNode[] constantNodes = new ConstantNode[phi.valueCount()]; |
| for (int i = 0; i < phi.valueCount(); i++) { |
| ConstantNode constant = ConstantFoldUtil.tryConstantFold(constantFields, constantReflection, metaAcccess, field, phi.valueAt(i).asJavaConstant(), |
| options); |
| if (constant == null) { |
| return null; |
| } |
| constantNodes[i] = constant; |
| } |
| return new ValuePhiNode(stamp, phi.merge(), constantNodes); |
| } |
| return null; |
| } |
| |
| @Override |
| public void virtualize(VirtualizerTool tool) { |
| ValueNode alias = tool.getAlias(object()); |
| if (alias instanceof VirtualObjectNode) { |
| int fieldIndex = ((VirtualInstanceNode) alias).fieldIndex(field()); |
| if (fieldIndex != -1) { |
| ValueNode entry = tool.getEntry((VirtualObjectNode) alias, fieldIndex); |
| if (stamp.isCompatible(entry.stamp(NodeView.DEFAULT))) { |
| tool.replaceWith(entry); |
| } else { |
| assert stamp(NodeView.DEFAULT).getStackKind() == JavaKind.Int && (entry.stamp(NodeView.DEFAULT).getStackKind() == JavaKind.Long || entry.getStackKind() == JavaKind.Double || |
| entry.getStackKind() == JavaKind.Illegal) : "Can only allow different stack kind two slot marker writes on one stot fields."; |
| } |
| } |
| } |
| } |
| |
| @Override |
| public Stamp uncheckedStamp() { |
| return uncheckedStamp; |
| } |
| |
| public void setObject(ValueNode newObject) { |
| this.updateUsages(object, newObject); |
| this.object = newObject; |
| } |
| |
| @Override |
| public NodeCycles estimatedNodeCycles() { |
| if (isVolatile()) { |
| return CYCLES_2; |
| } |
| return super.estimatedNodeCycles(); |
| } |
| } |
