src/jdk.internal.vm.ci/share/classes/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotObjectConstantImpl.java
author kvn
Wed, 01 May 2019 12:31:29 -0700
changeset 54669 ad45b3802d4e
parent 50858 2d3e99a72541
permissions -rw-r--r--
8220623: [JVMCI] Update JVMCI to support JVMCI based Compiler compiled into shared library Reviewed-by: dnsimon, never, stefank, rehn, neliasso, dholmes, kbarrett, coleenp
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/*
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 * Copyright (c) 2009, 2019, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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package jdk.vm.ci.hotspot;
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import static jdk.vm.ci.hotspot.HotSpotJVMCIRuntime.runtime;
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import jdk.vm.ci.meta.Assumptions;
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import jdk.vm.ci.meta.JavaConstant;
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import jdk.vm.ci.meta.JavaKind;
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import jdk.vm.ci.meta.ResolvedJavaType;
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/**
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 * Represents a constant non-{@code null} object reference, within the compiler and across the
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 * compiler/runtime interface.
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 */
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abstract class HotSpotObjectConstantImpl implements HotSpotObjectConstant {
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    protected final boolean compressed;
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    HotSpotObjectConstantImpl(boolean compressed) {
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        this.compressed = compressed;
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    }
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    @Override
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    public JavaKind getJavaKind() {
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        return JavaKind.Object;
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    }
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    @Override
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    public boolean isCompressed() {
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        return compressed;
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    }
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    @Override
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    public abstract JavaConstant compress();
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    @Override
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    public abstract JavaConstant uncompress();
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    @Override
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    public HotSpotResolvedObjectType getType() {
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        return runtime().reflection.getType(this);
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    }
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    @Override
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    public abstract int getIdentityHashCode();
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    @Override
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    public JavaConstant getCallSiteTarget(Assumptions assumptions) {
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        if (runtime().getCallSite().isInstance(this)) {
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            HotSpotObjectConstantImpl target = (HotSpotObjectConstantImpl) runtime().getHostJVMCIBackend().getConstantReflection().readFieldValue(
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                            HotSpotMethodHandleAccessProvider.Internals.instance().callSiteTargetField, this);
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            if (!runtime().getConstantCallSite().isInstance(this)) {
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                if (assumptions == null) {
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                    return null;
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                }
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                assumptions.record(new Assumptions.CallSiteTargetValue(this, target));
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            }
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            return target;
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        }
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        return null;
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    }
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    @Override
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    public boolean isInternedString() {
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        return runtime().compilerToVm.isInternedString(this);
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    }
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    @Override
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    public <T> T asObject(Class<T> type) {
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        return runtime().reflection.asObject(this, type);
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    }
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    @Override
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    public Object asObject(ResolvedJavaType type) {
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        return runtime().reflection.asObject(this, (HotSpotResolvedJavaType) type);
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    }
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    @Override
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    public boolean isNull() {
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        return false;
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    }
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    @Override
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    public boolean isDefaultForKind() {
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        return false;
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    }
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    @Override
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    public Object asBoxedPrimitive() {
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        throw new IllegalArgumentException();
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    }
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    @Override
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    public int asInt() {
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        throw new IllegalArgumentException();
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    }
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    @Override
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    public boolean asBoolean() {
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        throw new IllegalArgumentException();
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    }
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    @Override
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    public long asLong() {
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        throw new IllegalArgumentException();
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    }
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    @Override
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    public float asFloat() {
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        throw new IllegalArgumentException();
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    }
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    @Override
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    public double asDouble() {
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        throw new IllegalArgumentException();
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    }
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    @Override
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    public boolean equals(Object o) {
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        if (o == this) {
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            return true;
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        } else if (o instanceof HotSpotObjectConstantImpl) {
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            HotSpotObjectConstantImpl other = (HotSpotObjectConstantImpl) o;
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            return runtime().reflection.equals(this, other);
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        }
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        return false;
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    }
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    @Override
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    public int hashCode() {
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        return getIdentityHashCode();
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    }
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    @Override
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    public String toValueString() {
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        if (runtime().getJavaLangString().isInstance(this)) {
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            return "\"" + runtime().reflection.asString(this) + "\"";
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        } else {
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            return runtime().reflection.formatString(this);
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        }
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    }
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    @Override
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    public String toString() {
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        return (compressed ? "NarrowOop" : getJavaKind().getJavaName()) + "[" + runtime().reflection.formatString(this) + "]";
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    }
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    public JavaConstant readFieldValue(HotSpotResolvedJavaField field, boolean isVolatile) {
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        return runtime().reflection.readFieldValue(this, field, isVolatile);
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    }
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    public ResolvedJavaType asJavaType() {
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        return runtime().reflection.asJavaType(this);
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    }
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}