JDK14/Java14源码在线阅读

/*
 * Copyright (c) 2016, 2018, 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;

import org.graalvm.compiler.core.common.type.Stamp;
import org.graalvm.compiler.core.common.type.StampFactory;
import org.graalvm.compiler.core.common.type.TypeReference;
import org.graalvm.compiler.graph.Node;
import org.graalvm.compiler.graph.NodeClass;
import org.graalvm.compiler.graph.spi.CanonicalizerTool;
import org.graalvm.compiler.nodeinfo.NodeInfo;
import org.graalvm.compiler.nodes.extended.GuardingNode;

import jdk.vm.ci.meta.Assumptions;
import jdk.vm.ci.meta.ConstantReflectionProvider;
import jdk.vm.ci.meta.ResolvedJavaType;

/**
 * A {@link PiNode} where the type is not yet known. If the type becomes known at a later point in
 * the compilation, this can canonicalize to a regular {@link PiNode}.
 */
@NodeInfo
public final class DynamicPiNode extends PiNode {

    public static final NodeClass<DynamicPiNode> TYPE = NodeClass.create(DynamicPiNode.class);
    @Input ValueNode typeMirror;
    private final boolean exact;

    protected DynamicPiNode(ValueNode object, GuardingNode guard, ValueNode typeMirror, boolean exact) {
        super(TYPE, object, StampFactory.object(), guard);
        this.typeMirror = typeMirror;
        this.exact = exact;
    }

    public static ValueNode create(Assumptions assumptions, ConstantReflectionProvider constantReflection, ValueNode object, GuardingNode guard, ValueNode typeMirror, boolean exact) {
        ValueNode synonym = findSynonym(assumptions, constantReflection, object, guard, typeMirror, exact);
        if (synonym != null) {
            return synonym;
        }
        return new DynamicPiNode(object, guard, typeMirror, exact);
    }

    public static ValueNode create(Assumptions assumptions, ConstantReflectionProvider constantReflection, ValueNode object, GuardingNode guard, ValueNode typeMirror) {
        return create(assumptions, constantReflection, object, guard, typeMirror, false);
    }

    public boolean isExact() {
        return exact;
    }

    private static ValueNode findSynonym(Assumptions assumptions, ConstantReflectionProvider constantReflection, ValueNode object, GuardingNode guard, ValueNode typeMirror, boolean exact) {
        if (typeMirror.isConstant()) {
            ResolvedJavaType t = constantReflection.asJavaType(typeMirror.asConstant());
            if (t != null) {
                Stamp staticPiStamp;
                if (t.isPrimitive()) {
                    staticPiStamp = StampFactory.alwaysNull();
                } else {
                    TypeReference type = exact ? TypeReference.createExactTrusted(t) : TypeReference.createTrusted(assumptions, t);
                    staticPiStamp = StampFactory.object(type);
                }


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