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/*
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* Copyright (c) 2011, 2016, 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.HotSpotJVMCIRuntimeProvider.getArrayBaseOffset;
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import static jdk.vm.ci.hotspot.HotSpotJVMCIRuntimeProvider.getArrayIndexScale;
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import static jdk.vm.ci.hotspot.HotSpotResolvedObjectTypeImpl.fromObjectClass;
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import static jdk.vm.ci.hotspot.UnsafeAccess.UNSAFE;
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import java.lang.reflect.Array;
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import java.lang.reflect.Executable;
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import java.lang.reflect.Field;
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import java.lang.reflect.Modifier;
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import java.util.Objects;
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import jdk.vm.ci.code.CodeUtil;
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import jdk.vm.ci.code.TargetDescription;
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import jdk.vm.ci.common.JVMCIError;
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import jdk.vm.ci.meta.DeoptimizationAction;
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import jdk.vm.ci.meta.DeoptimizationReason;
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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.MetaAccessProvider;
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import jdk.vm.ci.meta.ResolvedJavaField;
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import jdk.vm.ci.meta.ResolvedJavaMethod;
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import jdk.vm.ci.meta.ResolvedJavaType;
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import jdk.vm.ci.meta.Signature;
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// JaCoCo Exclude
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/**
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* HotSpot implementation of {@link MetaAccessProvider}.
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*/
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public class HotSpotMetaAccessProvider implements MetaAccessProvider {
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protected final HotSpotJVMCIRuntimeProvider runtime;
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public HotSpotMetaAccessProvider(HotSpotJVMCIRuntimeProvider runtime) {
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this.runtime = runtime;
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}
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public ResolvedJavaType lookupJavaType(Class<?> clazz) {
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if (clazz == null) {
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throw new IllegalArgumentException("Class parameter was null");
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}
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return runtime.fromClass(clazz);
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}
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public HotSpotResolvedObjectType lookupJavaType(JavaConstant constant) {
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if (constant.isNull() || !(constant instanceof HotSpotObjectConstant)) {
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return null;
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}
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return ((HotSpotObjectConstant) constant).getType();
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}
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public Signature parseMethodDescriptor(String signature) {
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return new HotSpotSignature(runtime, signature);
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}
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public ResolvedJavaMethod lookupJavaMethod(Executable reflectionMethod) {
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return runtime.getCompilerToVM().asResolvedJavaMethod(Objects.requireNonNull(reflectionMethod));
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}
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public ResolvedJavaField lookupJavaField(Field reflectionField) {
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Class<?> fieldHolder = reflectionField.getDeclaringClass();
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HotSpotResolvedObjectType holder = fromObjectClass(fieldHolder);
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if (Modifier.isStatic(reflectionField.getModifiers())) {
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final long offset = UNSAFE.staticFieldOffset(reflectionField);
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for (ResolvedJavaField field : holder.getStaticFields()) {
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if (offset == ((HotSpotResolvedJavaField) field).offset()) {
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return field;
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}
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}
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} else {
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final long offset = UNSAFE.objectFieldOffset(reflectionField);
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for (ResolvedJavaField field : holder.getInstanceFields(false)) {
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if (offset == ((HotSpotResolvedJavaField) field).offset()) {
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return field;
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}
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}
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}
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throw new JVMCIError("unresolved field %s", reflectionField);
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}
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private static int intMaskRight(int n) {
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assert n <= 32;
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return n == 32 ? -1 : (1 << n) - 1;
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}
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@Override
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public JavaConstant encodeDeoptActionAndReason(DeoptimizationAction action, DeoptimizationReason reason, int debugId) {
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HotSpotVMConfig config = runtime.getConfig();
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int actionValue = convertDeoptAction(action);
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int reasonValue = convertDeoptReason(reason);
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int debugValue = debugId & intMaskRight(config.deoptimizationDebugIdBits);
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JavaConstant c = JavaConstant.forInt(
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~((debugValue << config.deoptimizationDebugIdShift) | (reasonValue << config.deoptimizationReasonShift) | (actionValue << config.deoptimizationActionShift)));
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assert c.asInt() < 0;
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return c;
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}
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public DeoptimizationReason decodeDeoptReason(JavaConstant constant) {
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HotSpotVMConfig config = runtime.getConfig();
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int reasonValue = ((~constant.asInt()) >> config.deoptimizationReasonShift) & intMaskRight(config.deoptimizationReasonBits);
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DeoptimizationReason reason = convertDeoptReason(reasonValue);
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return reason;
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}
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public DeoptimizationAction decodeDeoptAction(JavaConstant constant) {
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HotSpotVMConfig config = runtime.getConfig();
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int actionValue = ((~constant.asInt()) >> config.deoptimizationActionShift) & intMaskRight(config.deoptimizationActionBits);
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DeoptimizationAction action = convertDeoptAction(actionValue);
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return action;
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}
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public int decodeDebugId(JavaConstant constant) {
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HotSpotVMConfig config = runtime.getConfig();
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return ((~constant.asInt()) >> config.deoptimizationDebugIdShift) & intMaskRight(config.deoptimizationDebugIdBits);
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}
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public int convertDeoptAction(DeoptimizationAction action) {
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HotSpotVMConfig config = runtime.getConfig();
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switch (action) {
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case None:
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return config.deoptActionNone;
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case RecompileIfTooManyDeopts:
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return config.deoptActionMaybeRecompile;
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case InvalidateReprofile:
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return config.deoptActionReinterpret;
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case InvalidateRecompile:
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return config.deoptActionMakeNotEntrant;
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case InvalidateStopCompiling:
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return config.deoptActionMakeNotCompilable;
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default:
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throw new JVMCIError("%s", action);
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}
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}
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public DeoptimizationAction convertDeoptAction(int action) {
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HotSpotVMConfig config = runtime.getConfig();
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if (action == config.deoptActionNone) {
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return DeoptimizationAction.None;
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}
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if (action == config.deoptActionMaybeRecompile) {
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return DeoptimizationAction.RecompileIfTooManyDeopts;
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}
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if (action == config.deoptActionReinterpret) {
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return DeoptimizationAction.InvalidateReprofile;
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}
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if (action == config.deoptActionMakeNotEntrant) {
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return DeoptimizationAction.InvalidateRecompile;
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}
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if (action == config.deoptActionMakeNotCompilable) {
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return DeoptimizationAction.InvalidateStopCompiling;
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}
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throw new JVMCIError("%d", action);
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}
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public int convertDeoptReason(DeoptimizationReason reason) {
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HotSpotVMConfig config = runtime.getConfig();
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switch (reason) {
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case None:
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return config.deoptReasonNone;
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case NullCheckException:
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return config.deoptReasonNullCheck;
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case BoundsCheckException:
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return config.deoptReasonRangeCheck;
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case ClassCastException:
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return config.deoptReasonClassCheck;
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case ArrayStoreException:
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return config.deoptReasonArrayCheck;
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case UnreachedCode:
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return config.deoptReasonUnreached0;
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case TypeCheckedInliningViolated:
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return config.deoptReasonTypeCheckInlining;
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case OptimizedTypeCheckViolated:
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return config.deoptReasonOptimizedTypeCheck;
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case NotCompiledExceptionHandler:
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return config.deoptReasonNotCompiledExceptionHandler;
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case Unresolved:
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return config.deoptReasonUnresolved;
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case JavaSubroutineMismatch:
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return config.deoptReasonJsrMismatch;
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case ArithmeticException:
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return config.deoptReasonDiv0Check;
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case RuntimeConstraint:
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return config.deoptReasonConstraint;
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case LoopLimitCheck:
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return config.deoptReasonLoopLimitCheck;
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case Aliasing:
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return config.deoptReasonAliasing;
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case TransferToInterpreter:
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return config.deoptReasonTransferToInterpreter;
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default:
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throw new JVMCIError("%s", reason);
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}
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}
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public DeoptimizationReason convertDeoptReason(int reason) {
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HotSpotVMConfig config = runtime.getConfig();
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if (reason == config.deoptReasonNone) {
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return DeoptimizationReason.None;
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}
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if (reason == config.deoptReasonNullCheck) {
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return DeoptimizationReason.NullCheckException;
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}
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if (reason == config.deoptReasonRangeCheck) {
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return DeoptimizationReason.BoundsCheckException;
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}
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if (reason == config.deoptReasonClassCheck) {
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return DeoptimizationReason.ClassCastException;
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}
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if (reason == config.deoptReasonArrayCheck) {
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return DeoptimizationReason.ArrayStoreException;
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}
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if (reason == config.deoptReasonUnreached0) {
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return DeoptimizationReason.UnreachedCode;
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}
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if (reason == config.deoptReasonTypeCheckInlining) {
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return DeoptimizationReason.TypeCheckedInliningViolated;
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}
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if (reason == config.deoptReasonOptimizedTypeCheck) {
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return DeoptimizationReason.OptimizedTypeCheckViolated;
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}
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if (reason == config.deoptReasonNotCompiledExceptionHandler) {
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return DeoptimizationReason.NotCompiledExceptionHandler;
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}
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if (reason == config.deoptReasonUnresolved) {
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return DeoptimizationReason.Unresolved;
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}
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if (reason == config.deoptReasonJsrMismatch) {
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return DeoptimizationReason.JavaSubroutineMismatch;
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}
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if (reason == config.deoptReasonDiv0Check) {
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return DeoptimizationReason.ArithmeticException;
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}
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if (reason == config.deoptReasonConstraint) {
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return DeoptimizationReason.RuntimeConstraint;
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}
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if (reason == config.deoptReasonLoopLimitCheck) {
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return DeoptimizationReason.LoopLimitCheck;
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}
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if (reason == config.deoptReasonAliasing) {
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return DeoptimizationReason.Aliasing;
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}
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if (reason == config.deoptReasonTransferToInterpreter) {
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return DeoptimizationReason.TransferToInterpreter;
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}
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throw new JVMCIError("%x", reason);
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}
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@Override
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public long getMemorySize(JavaConstant constant) {
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if (constant.getJavaKind() == JavaKind.Object) {
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HotSpotResolvedObjectType lookupJavaType = lookupJavaType(constant);
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if (lookupJavaType == null) {
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return 0;
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} else {
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if (lookupJavaType.isArray()) {
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int length = Array.getLength(((HotSpotObjectConstantImpl) constant).object());
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ResolvedJavaType elementType = lookupJavaType.getComponentType();
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JavaKind elementKind = elementType.getJavaKind();
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final int headerSize = getArrayBaseOffset(elementKind);
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TargetDescription target = runtime.getHostJVMCIBackend().getTarget();
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int sizeOfElement = getArrayIndexScale(elementKind);
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int alignment = target.wordSize;
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int log2ElementSize = CodeUtil.log2(sizeOfElement);
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return computeArrayAllocationSize(length, alignment, headerSize, log2ElementSize);
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}
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return lookupJavaType.instanceSize();
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}
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} else {
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return constant.getJavaKind().getByteCount();
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}
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}
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/**
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* Computes the size of the memory chunk allocated for an array. This size accounts for the
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* array header size, body size and any padding after the last element to satisfy object
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* alignment requirements.
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*
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* @param length the number of elements in the array
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* @param alignment the object alignment requirement
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* @param headerSize the size of the array header
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* @param log2ElementSize log2 of the size of an element in the array
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*/
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public static int computeArrayAllocationSize(int length, int alignment, int headerSize, int log2ElementSize) {
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int size = (length << log2ElementSize) + headerSize + (alignment - 1);
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int mask = ~(alignment - 1);
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return size & mask;
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}
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}
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