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/*
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* Copyright (c) 2011, 2015, 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 static jdk.vm.ci.inittimer.InitTimer.timer;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.Method;
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import jdk.vm.ci.code.InstalledCode;
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import jdk.vm.ci.code.InvalidInstalledCodeException;
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import jdk.vm.ci.code.TargetDescription;
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import jdk.vm.ci.hotspotvmconfig.HotSpotVMField;
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import jdk.vm.ci.inittimer.InitTimer;
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import jdk.vm.ci.meta.JavaType;
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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 sun.misc.Unsafe;
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/**
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* Calls from Java into HotSpot. The behavior of all the methods in this class that take a native
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* pointer as an argument (e.g., {@link #getSymbol(long)}) is undefined if the argument does not
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* denote a valid native object.
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*/
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final class CompilerToVM {
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/**
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* Initializes the native part of the JVMCI runtime.
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*/
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private static native void registerNatives();
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static {
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initialize();
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}
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@SuppressWarnings("try")
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private static void initialize() {
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try (InitTimer t = timer("CompilerToVM.registerNatives")) {
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registerNatives();
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}
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}
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/**
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* Gets the {@link CompilerToVM} instance associated with the singleton
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* {@link HotSpotJVMCIRuntime} instance.
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*/
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public static CompilerToVM compilerToVM() {
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return runtime().getCompilerToVM();
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}
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/**
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* Copies the original bytecode of {@code method} into a new byte array and returns it.
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*
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* @return a new byte array containing the original bytecode of {@code method}
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*/
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native byte[] getBytecode(HotSpotResolvedJavaMethodImpl method);
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/**
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* Gets the number of entries in {@code method}'s exception handler table or 0 if it has not
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* exception handler table.
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*/
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native int getExceptionTableLength(HotSpotResolvedJavaMethodImpl method);
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/**
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* Gets the address of the first entry in {@code method}'s exception handler table.
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*
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* Each entry is a native object described by these fields:
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*
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* <ul>
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* <li>{@link HotSpotVMConfig#exceptionTableElementSize}</li>
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* <li>{@link HotSpotVMConfig#exceptionTableElementStartPcOffset}</li>
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* <li>{@link HotSpotVMConfig#exceptionTableElementEndPcOffset}</li>
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* <li>{@link HotSpotVMConfig#exceptionTableElementHandlerPcOffset}</li>
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* <li>{@link HotSpotVMConfig#exceptionTableElementCatchTypeIndexOffset}
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* </ul>
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*
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* @return 0 if {@code method} has no exception handlers (i.e.
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* {@code getExceptionTableLength(method) == 0})
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*/
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native long getExceptionTableStart(HotSpotResolvedJavaMethodImpl method);
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/**
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* Determines if {@code method} can be inlined. A method may not be inlinable for a number of
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* reasons such as:
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* <ul>
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* <li>a CompileOracle directive may prevent inlining or compilation of methods</li>
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* <li>the method may have a bytecode breakpoint set</li>
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* <li>the method may have other bytecode features that require special handling by the VM</li>
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* </ul>
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*/
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native boolean canInlineMethod(HotSpotResolvedJavaMethodImpl method);
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/**
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* Determines if {@code method} should be inlined at any cost. This could be because:
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* <ul>
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* <li>a CompileOracle directive may forces inlining of this methods</li>
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* <li>an annotation forces inlining of this method</li>
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* </ul>
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*/
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native boolean shouldInlineMethod(HotSpotResolvedJavaMethodImpl method);
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/**
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* Used to implement {@link ResolvedJavaType#findUniqueConcreteMethod(ResolvedJavaMethod)}.
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*
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* @param method the method on which to base the search
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* @param actualHolderType the best known type of receiver
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* @return the method result or 0 is there is no unique concrete method for {@code method}
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*/
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native HotSpotResolvedJavaMethodImpl findUniqueConcreteMethod(HotSpotResolvedObjectTypeImpl actualHolderType, HotSpotResolvedJavaMethodImpl method);
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/**
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* Gets the implementor for the interface class {@code type}.
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*
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* @return the implementor if there is a single implementor, 0 if there is no implementor, or
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* {@code type} itself if there is more than one implementor
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*/
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native HotSpotResolvedObjectTypeImpl getImplementor(HotSpotResolvedObjectTypeImpl type);
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/**
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* Determines if {@code method} is ignored by security stack walks.
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*/
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native boolean methodIsIgnoredBySecurityStackWalk(HotSpotResolvedJavaMethodImpl method);
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/**
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* Converts a name to a type.
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*
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* @param name a well formed Java type in {@linkplain JavaType#getName() internal} format
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* @param accessingClass the context of resolution (must not be null)
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* @param resolve force resolution to a {@link ResolvedJavaType}. If true, this method will
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* either return a {@link ResolvedJavaType} or throw an exception
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* @return the type for {@code name} or 0 if resolution failed and {@code resolve == false}
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* @throws LinkageError if {@code resolve == true} and the resolution failed
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*/
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native HotSpotResolvedObjectTypeImpl lookupType(String name, Class<?> accessingClass, boolean resolve);
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/**
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* Resolves the entry at index {@code cpi} in {@code constantPool} to an object.
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*
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* The behavior of this method is undefined if {@code cpi} does not denote one of the following
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* entry types: {@code JVM_CONSTANT_MethodHandle}, {@code JVM_CONSTANT_MethodHandleInError},
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* {@code JVM_CONSTANT_MethodType} and {@code JVM_CONSTANT_MethodTypeInError}.
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*/
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native Object resolveConstantInPool(HotSpotConstantPool constantPool, int cpi);
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/**
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* Resolves the entry at index {@code cpi} in {@code constantPool} to an object, looking in the
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* constant pool cache first.
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*
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* The behavior of this method is undefined if {@code cpi} does not denote a
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* {@code JVM_CONSTANT_String} entry.
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*/
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native Object resolvePossiblyCachedConstantInPool(HotSpotConstantPool constantPool, int cpi);
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/**
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* Gets the {@code JVM_CONSTANT_NameAndType} index from the entry at index {@code cpi} in
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* {@code constantPool}.
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*
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* The behavior of this method is undefined if {@code cpi} does not denote an entry containing a
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* {@code JVM_CONSTANT_NameAndType} index.
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*/
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native int lookupNameAndTypeRefIndexInPool(HotSpotConstantPool constantPool, int cpi);
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/**
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* Gets the name of the {@code JVM_CONSTANT_NameAndType} entry referenced by another entry
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* denoted by {@code which} in {@code constantPool}.
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*
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* The behavior of this method is undefined if {@code which} does not denote a entry that
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* references a {@code JVM_CONSTANT_NameAndType} entry.
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*/
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native String lookupNameInPool(HotSpotConstantPool constantPool, int which);
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/**
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* Gets the signature of the {@code JVM_CONSTANT_NameAndType} entry referenced by another entry
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* denoted by {@code which} in {@code constantPool}.
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*
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* The behavior of this method is undefined if {@code which} does not denote a entry that
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* references a {@code JVM_CONSTANT_NameAndType} entry.
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*/
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native String lookupSignatureInPool(HotSpotConstantPool constantPool, int which);
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/**
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* Gets the {@code JVM_CONSTANT_Class} index from the entry at index {@code cpi} in
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* {@code constantPool}.
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*
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* The behavior of this method is undefined if {@code cpi} does not denote an entry containing a
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* {@code JVM_CONSTANT_Class} index.
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*/
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native int lookupKlassRefIndexInPool(HotSpotConstantPool constantPool, int cpi);
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/**
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* Looks up a class denoted by the {@code JVM_CONSTANT_Class} entry at index {@code cpi} in
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* {@code constantPool}. This method does not perform any resolution.
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*
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* The behavior of this method is undefined if {@code cpi} does not denote a
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* {@code JVM_CONSTANT_Class} entry.
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*
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* @return the resolved class entry or a String otherwise
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*/
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native Object lookupKlassInPool(HotSpotConstantPool constantPool, int cpi);
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/**
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* Looks up a method denoted by the entry at index {@code cpi} in {@code constantPool}. This
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* method does not perform any resolution.
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*
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* The behavior of this method is undefined if {@code cpi} does not denote an entry representing
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* a method.
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*
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* @param opcode the opcode of the instruction for which the lookup is being performed or
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* {@code -1}. If non-negative, then resolution checks specific to the bytecode it
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* denotes are performed if the method is already resolved. Should any of these
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* checks fail, 0 is returned.
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* @return the resolved method entry, 0 otherwise
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*/
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native HotSpotResolvedJavaMethodImpl lookupMethodInPool(HotSpotConstantPool constantPool, int cpi, byte opcode);
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/**
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* Ensures that the type referenced by the specified {@code JVM_CONSTANT_InvokeDynamic} entry at
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* index {@code cpi} in {@code constantPool} is loaded and initialized.
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*
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* The behavior of this method is undefined if {@code cpi} does not denote a
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* {@code JVM_CONSTANT_InvokeDynamic} entry.
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*/
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native void resolveInvokeDynamicInPool(HotSpotConstantPool constantPool, int cpi);
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/**
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* Ensures that the type referenced by the entry for a <a
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* href="https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-2.html#jvms-2.9">signature
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* polymorphic</a> method at index {@code cpi} in {@code constantPool} is loaded and
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* initialized.
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*
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* The behavior of this method is undefined if {@code cpi} does not denote an entry representing
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* a signature polymorphic method.
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*/
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native void resolveInvokeHandleInPool(HotSpotConstantPool constantPool, int cpi);
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/**
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* Gets the resolved type denoted by the entry at index {@code cpi} in {@code constantPool}.
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*
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* The behavior of this method is undefined if {@code cpi} does not denote an entry representing
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* a class.
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*
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* @throws LinkageError if resolution failed
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*/
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native HotSpotResolvedObjectTypeImpl resolveTypeInPool(HotSpotConstantPool constantPool, int cpi) throws LinkageError;
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/**
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* Looks up and attempts to resolve the {@code JVM_CONSTANT_Field} entry at index {@code cpi} in
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* {@code constantPool}. The values returned in {@code info} are:
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*
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* <pre>
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* [(int) flags, // only valid if field is resolved
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* (int) offset] // only valid if field is resolved
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* </pre>
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*
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* The behavior of this method is undefined if {@code cpi} does not denote a
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* {@code JVM_CONSTANT_Field} entry.
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*
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* @param info an array in which the details of the field are returned
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* @return the type defining the field if resolution is successful, 0 otherwise
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*/
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native HotSpotResolvedObjectTypeImpl resolveFieldInPool(HotSpotConstantPool constantPool, int cpi, byte opcode, long[] info);
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/**
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* Converts {@code cpci} from an index into the cache for {@code constantPool} to an index
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* directly into {@code constantPool}.
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*
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* The behavior of this method is undefined if {@code ccpi} is an invalid constant pool cache
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* index.
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*/
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native int constantPoolRemapInstructionOperandFromCache(HotSpotConstantPool constantPool, int cpci);
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/**
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* Gets the appendix object (if any) associated with the entry at index {@code cpi} in
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* {@code constantPool}.
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*/
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native Object lookupAppendixInPool(HotSpotConstantPool constantPool, int cpi);
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/**
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* Installs the result of a compilation into the code cache.
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*
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* @param target the target where this code should be installed
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* @param compiledCode the result of a compilation
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* @param code the details of the installed CodeBlob are written to this object
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* @return the outcome of the installation which will be one of
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* {@link HotSpotVMConfig#codeInstallResultOk},
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* {@link HotSpotVMConfig#codeInstallResultCacheFull},
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* {@link HotSpotVMConfig#codeInstallResultCodeTooLarge},
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* {@link HotSpotVMConfig#codeInstallResultDependenciesFailed} or
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* {@link HotSpotVMConfig#codeInstallResultDependenciesInvalid}.
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*/
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native int installCode(TargetDescription target, HotSpotCompiledCode compiledCode, InstalledCode code, HotSpotSpeculationLog speculationLog);
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public native int getMetadata(TargetDescription target, HotSpotCompiledCode compiledCode, HotSpotMetaData metaData);
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/**
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* Notifies the VM of statistics for a completed compilation.
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*
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* @param id the identifier of the compilation
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* @param method the method compiled
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* @param osr specifies if the compilation was for on-stack-replacement
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* @param processedBytecodes the number of bytecodes processed during the compilation, including
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* the bytecodes of all inlined methods
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* @param time the amount time spent compiling {@code method}
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* @param timeUnitsPerSecond the granularity of the units for the {@code time} value
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* @param installedCode the nmethod installed as a result of the compilation
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*/
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synchronized native void notifyCompilationStatistics(int id, HotSpotResolvedJavaMethodImpl method, boolean osr, int processedBytecodes, long time, long timeUnitsPerSecond,
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InstalledCode installedCode);
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/**
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* Resets all compilation statistics.
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*/
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native void resetCompilationStatistics();
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/**
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* Initializes the fields of {@code config}.
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*/
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native long initializeConfiguration(HotSpotVMConfig config);
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/**
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* Resolves the implementation of {@code method} for virtual dispatches on objects of dynamic
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* type {@code exactReceiver}. This resolution process only searches "up" the class hierarchy of
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* {@code exactReceiver}.
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*
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* @param caller the caller or context type used to perform access checks
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* @return the link-time resolved method (might be abstract) or {@code 0} if it can not be
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* linked
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*/
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native HotSpotResolvedJavaMethodImpl resolveMethod(HotSpotResolvedObjectTypeImpl exactReceiver, HotSpotResolvedJavaMethodImpl method, HotSpotResolvedObjectTypeImpl caller);
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/**
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* Gets the static initializer of {@code type}.
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*
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* @return 0 if {@code type} has no static initializer
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*/
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native HotSpotResolvedJavaMethodImpl getClassInitializer(HotSpotResolvedObjectTypeImpl type);
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/**
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* Determines if {@code type} or any of its currently loaded subclasses overrides
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* {@code Object.finalize()}.
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*/
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native boolean hasFinalizableSubclass(HotSpotResolvedObjectTypeImpl type);
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/**
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* Gets the method corresponding to {@code holder} and slot number {@code slot} (i.e.
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* {@link Method#slot} or {@link Constructor#slot}).
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*/
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native HotSpotResolvedJavaMethodImpl getResolvedJavaMethodAtSlot(Class<?> holder, int slot);
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/**
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* Gets the maximum absolute offset of a PC relative call to {@code address} from any position
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* in the code cache.
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*
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* @param address an address that may be called from any code in the code cache
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* @return -1 if {@code address == 0}
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*/
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378 |
native long getMaxCallTargetOffset(long address);
|
33160
|
379 |
|
|
380 |
/**
|
|
381 |
* Gets a textual disassembly of {@code codeBlob}.
|
|
382 |
*
|
|
383 |
* @return a non-zero length string containing a disassembly of {@code codeBlob} or null if
|
|
384 |
* {@code codeBlob} could not be disassembled for some reason
|
|
385 |
*/
|
|
386 |
// The HotSpot disassembler seems not to be thread safe so it's better to synchronize its usage
|
33632
|
387 |
synchronized native String disassembleCodeBlob(InstalledCode installedCode);
|
33160
|
388 |
|
|
389 |
/**
|
|
390 |
* Gets a stack trace element for {@code method} at bytecode index {@code bci}.
|
|
391 |
*/
|
|
392 |
native StackTraceElement getStackTraceElement(HotSpotResolvedJavaMethodImpl method, int bci);
|
|
393 |
|
|
394 |
/**
|
|
395 |
* Executes some {@code installedCode} with arguments {@code args}.
|
|
396 |
*
|
|
397 |
* @return the result of executing {@code installedCode}
|
|
398 |
* @throws InvalidInstalledCodeException if {@code installedCode} has been invalidated
|
|
399 |
*/
|
|
400 |
native Object executeInstalledCode(Object[] args, InstalledCode installedCode) throws InvalidInstalledCodeException;
|
|
401 |
|
|
402 |
/**
|
|
403 |
* Gets the line number table for {@code method}. The line number table is encoded as (bci,
|
|
404 |
* source line number) pairs.
|
|
405 |
*
|
|
406 |
* @return the line number table for {@code method} or null if it doesn't have one
|
|
407 |
*/
|
|
408 |
native long[] getLineNumberTable(HotSpotResolvedJavaMethodImpl method);
|
|
409 |
|
|
410 |
/**
|
|
411 |
* Gets the number of entries in the local variable table for {@code method}.
|
|
412 |
*
|
|
413 |
* @return the number of entries in the local variable table for {@code method}
|
|
414 |
*/
|
|
415 |
native int getLocalVariableTableLength(HotSpotResolvedJavaMethodImpl method);
|
|
416 |
|
|
417 |
/**
|
|
418 |
* Gets the address of the first entry in the local variable table for {@code method}.
|
|
419 |
*
|
|
420 |
* Each entry is a native object described by these fields:
|
|
421 |
*
|
|
422 |
* <ul>
|
|
423 |
* <li>{@link HotSpotVMConfig#localVariableTableElementSize}</li>
|
|
424 |
* <li>{@link HotSpotVMConfig#localVariableTableElementLengthOffset}</li>
|
|
425 |
* <li>{@link HotSpotVMConfig#localVariableTableElementNameCpIndexOffset}</li>
|
|
426 |
* <li>{@link HotSpotVMConfig#localVariableTableElementDescriptorCpIndexOffset}</li>
|
|
427 |
* <li>{@link HotSpotVMConfig#localVariableTableElementSignatureCpIndexOffset}
|
|
428 |
* <li>{@link HotSpotVMConfig#localVariableTableElementSlotOffset}
|
|
429 |
* <li>{@link HotSpotVMConfig#localVariableTableElementStartBciOffset}
|
|
430 |
* </ul>
|
|
431 |
*
|
|
432 |
* @return 0 if {@code method} does not have a local variable table
|
|
433 |
*/
|
|
434 |
native long getLocalVariableTableStart(HotSpotResolvedJavaMethodImpl method);
|
|
435 |
|
|
436 |
/**
|
|
437 |
* Reads an object pointer within a VM data structure. That is, any {@link HotSpotVMField} whose
|
|
438 |
* {@link HotSpotVMField#type() type} is {@code "oop"} (e.g.,
|
|
439 |
* {@code ArrayKlass::_component_mirror}, {@code Klass::_java_mirror},
|
|
440 |
* {@code JavaThread::_threadObj}).
|
|
441 |
*
|
|
442 |
* Note that {@link Unsafe#getObject(Object, long)} cannot be used for this since it does a
|
|
443 |
* {@code narrowOop} read if the VM is using compressed oops whereas oops within VM data
|
|
444 |
* structures are (currently) always uncompressed.
|
|
445 |
*
|
|
446 |
* @param address address of an oop field within a VM data structure
|
|
447 |
*/
|
|
448 |
native Object readUncompressedOop(long address);
|
|
449 |
|
|
450 |
/**
|
|
451 |
* Determines if {@code method} should not be inlined or compiled.
|
|
452 |
*/
|
|
453 |
native void doNotInlineOrCompile(HotSpotResolvedJavaMethodImpl method);
|
|
454 |
|
|
455 |
/**
|
|
456 |
* Invalidates the profiling information for {@code method} and (re)initializes it such that
|
|
457 |
* profiling restarts upon its next invocation.
|
|
458 |
*/
|
|
459 |
native void reprofile(HotSpotResolvedJavaMethodImpl method);
|
|
460 |
|
|
461 |
/**
|
|
462 |
* Invalidates {@code installedCode} such that {@link InvalidInstalledCodeException} will be
|
|
463 |
* raised the next time {@code installedCode} is executed.
|
|
464 |
*/
|
33632
|
465 |
native void invalidateInstalledCode(InstalledCode installedCode);
|
33160
|
466 |
|
|
467 |
/**
|
|
468 |
* Collects the current values of all JVMCI benchmark counters, summed up over all threads.
|
|
469 |
*/
|
33632
|
470 |
native long[] collectCounters();
|
33160
|
471 |
|
|
472 |
/**
|
|
473 |
* Determines if {@code metaspaceMethodData} is mature.
|
|
474 |
*/
|
|
475 |
native boolean isMature(long metaspaceMethodData);
|
|
476 |
|
|
477 |
/**
|
|
478 |
* Generate a unique id to identify the result of the compile.
|
|
479 |
*/
|
|
480 |
native int allocateCompileId(HotSpotResolvedJavaMethodImpl method, int entryBCI);
|
|
481 |
|
|
482 |
/**
|
|
483 |
* Determines if {@code method} has OSR compiled code identified by {@code entryBCI} for
|
|
484 |
* compilation level {@code level}.
|
|
485 |
*/
|
|
486 |
native boolean hasCompiledCodeForOSR(HotSpotResolvedJavaMethodImpl method, int entryBCI, int level);
|
|
487 |
|
|
488 |
/**
|
|
489 |
* Gets the value of {@code metaspaceSymbol} as a String.
|
|
490 |
*/
|
|
491 |
native String getSymbol(long metaspaceSymbol);
|
|
492 |
|
|
493 |
/**
|
|
494 |
* Looks for the next Java stack frame matching an entry in {@code methods}.
|
|
495 |
*
|
|
496 |
* @param frame the starting point of the search, where {@code null} refers to the topmost frame
|
|
497 |
* @param methods the methods to look for, where {@code null} means that any frame is returned
|
|
498 |
* @return the frame, or {@code null} if the end of the stack was reached during the search
|
|
499 |
*/
|
33632
|
500 |
native HotSpotStackFrameReference getNextStackFrame(HotSpotStackFrameReference frame, ResolvedJavaMethod[] methods, int initialSkip);
|
33160
|
501 |
|
|
502 |
/**
|
|
503 |
* Materializes all virtual objects within {@code stackFrame} updates its locals.
|
|
504 |
*
|
|
505 |
* @param invalidate if {@code true}, the compiled method for the stack frame will be
|
|
506 |
* invalidated.
|
|
507 |
*/
|
|
508 |
native void materializeVirtualObjects(HotSpotStackFrameReference stackFrame, boolean invalidate);
|
|
509 |
|
|
510 |
/**
|
|
511 |
* Gets the v-table index for interface method {@code method} in the receiver {@code type} or
|
|
512 |
* {@link HotSpotVMConfig#invalidVtableIndex} if {@code method} is not in {@code type}'s
|
|
513 |
* v-table.
|
|
514 |
*
|
|
515 |
* @throws InternalError if {@code type} is an interface or {@code method} is not held by an
|
|
516 |
* interface or class represented by {@code type} is not initialized
|
|
517 |
*/
|
|
518 |
native int getVtableIndexForInterfaceMethod(HotSpotResolvedObjectTypeImpl type, HotSpotResolvedJavaMethodImpl method);
|
|
519 |
|
|
520 |
/**
|
|
521 |
* Determines if debug info should also be emitted at non-safepoint locations.
|
|
522 |
*/
|
33632
|
523 |
|
|
524 |
native boolean shouldDebugNonSafepoints();
|
33160
|
525 |
|
|
526 |
/**
|
|
527 |
* Writes {@code length} bytes from {@code bytes} starting at offset {@code offset} to the
|
|
528 |
* HotSpot's log stream.
|
|
529 |
*
|
33632
|
530 |
* @exception NullPointerException if {@code bytes == null}
|
33160
|
531 |
* @exception IndexOutOfBoundsException if copying would cause access of data outside array
|
33632
|
532 |
* bounds
|
33160
|
533 |
*/
|
33632
|
534 |
native void writeDebugOutput(byte[] bytes, int offset, int length);
|
33160
|
535 |
|
|
536 |
/**
|
|
537 |
* Flush HotSpot's log stream.
|
|
538 |
*/
|
33632
|
539 |
native void flushDebugOutput();
|
33160
|
540 |
|
|
541 |
/**
|
33632
|
542 |
* Read a HotSpot Method* value from the memory location described by {@code base} plus
|
|
543 |
* {@code displacement} and return the {@link HotSpotResolvedJavaMethodImpl} wrapping it. This
|
|
544 |
* method does no checking that the memory location actually contains a valid pointer and may
|
|
545 |
* crash the VM if an invalid location is provided. If the {@code base} is null then
|
|
546 |
* {@code displacement} is used by itself. If {@code base} is a
|
33160
|
547 |
* {@link HotSpotResolvedJavaMethodImpl}, {@link HotSpotConstantPool} or
|
|
548 |
* {@link HotSpotResolvedObjectTypeImpl} then the metaspace pointer is fetched from that object
|
33632
|
549 |
* and added to {@code displacement}. Any other non-null object type causes an
|
|
550 |
* {@link IllegalArgumentException} to be thrown.
|
33160
|
551 |
*
|
|
552 |
* @param base an object to read from or null
|
|
553 |
* @param displacement
|
|
554 |
* @return null or the resolved method for this location
|
|
555 |
*/
|
|
556 |
native HotSpotResolvedJavaMethodImpl getResolvedJavaMethod(Object base, long displacement);
|
|
557 |
|
|
558 |
/**
|
33632
|
559 |
* Read a HotSpot ConstantPool* value from the memory location described by {@code base} plus
|
|
560 |
* {@code displacement} and return the {@link HotSpotConstantPool} wrapping it. This method does
|
|
561 |
* no checking that the memory location actually contains a valid pointer and may crash the VM
|
|
562 |
* if an invalid location is provided. If the {@code base} is null then {@code displacement} is
|
|
563 |
* used by itself. If {@code base} is a {@link HotSpotResolvedJavaMethodImpl},
|
|
564 |
* {@link HotSpotConstantPool} or {@link HotSpotResolvedObjectTypeImpl} then the metaspace
|
|
565 |
* pointer is fetched from that object and added to {@code displacement}. Any other non-null
|
|
566 |
* object type causes an {@link IllegalArgumentException} to be thrown.
|
33160
|
567 |
*
|
|
568 |
* @param base an object to read from or null
|
|
569 |
* @param displacement
|
|
570 |
* @return null or the resolved method for this location
|
|
571 |
*/
|
|
572 |
native HotSpotConstantPool getConstantPool(Object base, long displacement);
|
|
573 |
|
|
574 |
/**
|
33632
|
575 |
* Read a HotSpot Klass* value from the memory location described by {@code base} plus
|
|
576 |
* {@code displacement} and return the {@link HotSpotResolvedObjectTypeImpl} wrapping it. This
|
|
577 |
* method does no checking that the memory location actually contains a valid pointer and may
|
|
578 |
* crash the VM if an invalid location is provided. If the {@code base} is null then
|
|
579 |
* {@code displacement} is used by itself. If {@code base} is a
|
33160
|
580 |
* {@link HotSpotResolvedJavaMethodImpl}, {@link HotSpotConstantPool} or
|
|
581 |
* {@link HotSpotResolvedObjectTypeImpl} then the metaspace pointer is fetched from that object
|
33632
|
582 |
* and added to {@code displacement}. Any other non-null object type causes an
|
|
583 |
* {@link IllegalArgumentException} to be thrown.
|
33160
|
584 |
*
|
|
585 |
* @param base an object to read from or null
|
|
586 |
* @param displacement
|
|
587 |
* @param compressed true if the location contains a compressed Klass*
|
|
588 |
* @return null or the resolved method for this location
|
|
589 |
*/
|
|
590 |
native HotSpotResolvedObjectTypeImpl getResolvedJavaType(Object base, long displacement, boolean compressed);
|
33632
|
591 |
|
|
592 |
/**
|
|
593 |
* Return the size of the HotSpot ProfileData* pointed at by {@code position}. If
|
|
594 |
* {@code position} is outside the space of the MethodData then an
|
|
595 |
* {@link IllegalArgumentException} is thrown. A {@code position} inside the MethodData but that
|
|
596 |
* isn't pointing at a valid ProfileData will crash the VM.
|
|
597 |
*
|
|
598 |
* @param metaspaceMethodData
|
|
599 |
* @param position
|
|
600 |
* @return the size of the ProfileData item pointed at by {@code position}
|
|
601 |
* @throws IllegalArgumentException if an out of range position is given
|
|
602 |
*/
|
|
603 |
native int methodDataProfileDataSize(long metaspaceMethodData, int position);
|
33160
|
604 |
}
|