--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jvmci/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/CompilerToVM.java	Thu Oct 08 17:28:41 2015 -0700
@@ -0,0 +1,598 @@
+/*
+ * Copyright (c) 2011, 2015, 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 jdk.vm.ci.hotspot;
+
+import static jdk.vm.ci.hotspot.HotSpotJVMCIRuntime.runtime;
+import static jdk.vm.ci.inittimer.InitTimer.timer;
+
+import java.lang.reflect.Constructor;
+import java.lang.reflect.Method;
+
+import jdk.vm.ci.code.InstalledCode;
+import jdk.vm.ci.code.InvalidInstalledCodeException;
+import jdk.vm.ci.code.TargetDescription;
+import jdk.vm.ci.hotspotvmconfig.HotSpotVMField;
+import jdk.vm.ci.inittimer.InitTimer;
+import jdk.vm.ci.meta.JavaType;
+import jdk.vm.ci.meta.ResolvedJavaMethod;
+import jdk.vm.ci.meta.ResolvedJavaType;
+import jdk.vm.ci.meta.SpeculationLog;
+import sun.misc.Unsafe;
+
+/**
+ * Calls from Java into HotSpot. The behavior of all the methods in this class that take a native
+ * pointer as an argument (e.g., {@link #getSymbol(long)}) is undefined if the argument does not
+ * denote a valid native object.
+ */
+final class CompilerToVM {
+    /**
+     * Initializes the native part of the JVMCI runtime.
+     */
+    private static native void registerNatives();
+
+    static {
+        initialize();
+    }
+
+    @SuppressWarnings("try")
+    private static void initialize() {
+        try (InitTimer t = timer("CompilerToVM.registerNatives")) {
+            registerNatives();
+        }
+    }
+
+    /**
+     * Gets the {@link CompilerToVM} instance associated with the singleton
+     * {@link HotSpotJVMCIRuntime} instance.
+     */
+    public static CompilerToVM compilerToVM() {
+        return runtime().getCompilerToVM();
+    }
+
+    /**
+     * Copies the original bytecode of {@code method} into a new byte array and returns it.
+     *
+     * @return a new byte array containing the original bytecode of {@code method}
+     */
+    native byte[] getBytecode(HotSpotResolvedJavaMethodImpl method);
+
+    /**
+     * Gets the number of entries in {@code method}'s exception handler table or 0 if it has not
+     * exception handler table.
+     */
+    native int getExceptionTableLength(HotSpotResolvedJavaMethodImpl method);
+
+    /**
+     * Gets the address of the first entry in {@code method}'s exception handler table.
+     *
+     * Each entry is a native object described by these fields:
+     *
+     * <ul>
+     * <li>{@link HotSpotVMConfig#exceptionTableElementSize}</li>
+     * <li>{@link HotSpotVMConfig#exceptionTableElementStartPcOffset}</li>
+     * <li>{@link HotSpotVMConfig#exceptionTableElementEndPcOffset}</li>
+     * <li>{@link HotSpotVMConfig#exceptionTableElementHandlerPcOffset}</li>
+     * <li>{@link HotSpotVMConfig#exceptionTableElementCatchTypeIndexOffset}
+     * </ul>
+     *
+     * @return 0 if {@code method} has no exception handlers (i.e.
+     *         {@code getExceptionTableLength(method) == 0})
+     */
+    native long getExceptionTableStart(HotSpotResolvedJavaMethodImpl method);
+
+    /**
+     * Determines if {@code method} can be inlined. A method may not be inlinable for a number of
+     * reasons such as:
+     * <ul>
+     * <li>a CompileOracle directive may prevent inlining or compilation of methods</li>
+     * <li>the method may have a bytecode breakpoint set</li>
+     * <li>the method may have other bytecode features that require special handling by the VM</li>
+     * </ul>
+     */
+    native boolean canInlineMethod(HotSpotResolvedJavaMethodImpl method);
+
+    /**
+     * Determines if {@code method} should be inlined at any cost. This could be because:
+     * <ul>
+     * <li>a CompileOracle directive may forces inlining of this methods</li>
+     * <li>an annotation forces inlining of this method</li>
+     * </ul>
+     */
+    native boolean shouldInlineMethod(HotSpotResolvedJavaMethodImpl method);
+
+    /**
+     * Used to implement {@link ResolvedJavaType#findUniqueConcreteMethod(ResolvedJavaMethod)}.
+     *
+     * @param method the method on which to base the search
+     * @param actualHolderType the best known type of receiver
+     * @return the method result or 0 is there is no unique concrete method for {@code method}
+     */
+    native HotSpotResolvedJavaMethodImpl findUniqueConcreteMethod(HotSpotResolvedObjectTypeImpl actualHolderType, HotSpotResolvedJavaMethodImpl method);
+
+    /**
+     * Gets the implementor for the interface class {@code type}.
+     *
+     * @return the implementor if there is a single implementor, 0 if there is no implementor, or
+     *         {@code type} itself if there is more than one implementor
+     */
+    native HotSpotResolvedObjectTypeImpl getImplementor(HotSpotResolvedObjectTypeImpl type);
+
+    /**
+     * Determines if {@code method} is ignored by security stack walks.
+     */
+    native boolean methodIsIgnoredBySecurityStackWalk(HotSpotResolvedJavaMethodImpl method);
+
+    /**
+     * Converts a name to a type.
+     *
+     * @param name a well formed Java type in {@linkplain JavaType#getName() internal} format
+     * @param accessingClass the context of resolution (must not be null)
+     * @param resolve force resolution to a {@link ResolvedJavaType}. If true, this method will
+     *            either return a {@link ResolvedJavaType} or throw an exception
+     * @return the type for {@code name} or 0 if resolution failed and {@code resolve == false}
+     * @throws LinkageError if {@code resolve == true} and the resolution failed
+     */
+    native HotSpotResolvedObjectTypeImpl lookupType(String name, Class<?> accessingClass, boolean resolve);
+
+    /**
+     * Resolves the entry at index {@code cpi} in {@code constantPool} to an object.
+     *
+     * The behavior of this method is undefined if {@code cpi} does not denote one of the following
+     * entry types: {@code JVM_CONSTANT_MethodHandle}, {@code JVM_CONSTANT_MethodHandleInError},
+     * {@code JVM_CONSTANT_MethodType} and {@code JVM_CONSTANT_MethodTypeInError}.
+     */
+    native Object resolveConstantInPool(HotSpotConstantPool constantPool, int cpi);
+
+    /**
+     * Resolves the entry at index {@code cpi} in {@code constantPool} to an object, looking in the
+     * constant pool cache first.
+     *
+     * The behavior of this method is undefined if {@code cpi} does not denote a
+     * {@code JVM_CONSTANT_String} entry.
+     */
+    native Object resolvePossiblyCachedConstantInPool(HotSpotConstantPool constantPool, int cpi);
+
+    /**
+     * Gets the {@code JVM_CONSTANT_NameAndType} index from the entry at index {@code cpi} in
+     * {@code constantPool}.
+     *
+     * The behavior of this method is undefined if {@code cpi} does not denote an entry containing a
+     * {@code JVM_CONSTANT_NameAndType} index.
+     */
+    native int lookupNameAndTypeRefIndexInPool(HotSpotConstantPool constantPool, int cpi);
+
+    /**
+     * Gets the name of the {@code JVM_CONSTANT_NameAndType} entry referenced by another entry
+     * denoted by {@code which} in {@code constantPool}.
+     *
+     * The behavior of this method is undefined if {@code which} does not denote a entry that
+     * references a {@code JVM_CONSTANT_NameAndType} entry.
+     */
+    native String lookupNameInPool(HotSpotConstantPool constantPool, int which);
+
+    /**
+     * Gets the signature of the {@code JVM_CONSTANT_NameAndType} entry referenced by another entry
+     * denoted by {@code which} in {@code constantPool}.
+     *
+     * The behavior of this method is undefined if {@code which} does not denote a entry that
+     * references a {@code JVM_CONSTANT_NameAndType} entry.
+     */
+    native String lookupSignatureInPool(HotSpotConstantPool constantPool, int which);
+
+    /**
+     * Gets the {@code JVM_CONSTANT_Class} index from the entry at index {@code cpi} in
+     * {@code constantPool}.
+     *
+     * The behavior of this method is undefined if {@code cpi} does not denote an entry containing a
+     * {@code JVM_CONSTANT_Class} index.
+     */
+    native int lookupKlassRefIndexInPool(HotSpotConstantPool constantPool, int cpi);
+
+    /**
+     * Looks up a class denoted by the {@code JVM_CONSTANT_Class} entry at index {@code cpi} in
+     * {@code constantPool}. This method does not perform any resolution.
+     *
+     * The behavior of this method is undefined if {@code cpi} does not denote a
+     * {@code JVM_CONSTANT_Class} entry.
+     *
+     * @return the resolved class entry or a String otherwise
+     */
+    native Object lookupKlassInPool(HotSpotConstantPool constantPool, int cpi);
+
+    /**
+     * Looks up a method denoted by the entry at index {@code cpi} in {@code constantPool}. This
+     * method does not perform any resolution.
+     *
+     * The behavior of this method is undefined if {@code cpi} does not denote an entry representing
+     * a method.
+     *
+     * @param opcode the opcode of the instruction for which the lookup is being performed or
+     *            {@code -1}. If non-negative, then resolution checks specific to the bytecode it
+     *            denotes are performed if the method is already resolved. Should any of these
+     *            checks fail, 0 is returned.
+     * @return the resolved method entry, 0 otherwise
+     */
+    native HotSpotResolvedJavaMethodImpl lookupMethodInPool(HotSpotConstantPool constantPool, int cpi, byte opcode);
+
+    /**
+     * Ensures that the type referenced by the specified {@code JVM_CONSTANT_InvokeDynamic} entry at
+     * index {@code cpi} in {@code constantPool} is loaded and initialized.
+     *
+     * The behavior of this method is undefined if {@code cpi} does not denote a
+     * {@code JVM_CONSTANT_InvokeDynamic} entry.
+     */
+    native void resolveInvokeDynamicInPool(HotSpotConstantPool constantPool, int cpi);
+
+    /**
+     * Ensures that the type referenced by the entry for a <a
+     * href="https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-2.html#jvms-2.9">signature
+     * polymorphic</a> method at index {@code cpi} in {@code constantPool} is loaded and
+     * initialized.
+     *
+     * The behavior of this method is undefined if {@code cpi} does not denote an entry representing
+     * a signature polymorphic method.
+     */
+    native void resolveInvokeHandleInPool(HotSpotConstantPool constantPool, int cpi);
+
+    /**
+     * Gets the resolved type denoted by the entry at index {@code cpi} in {@code constantPool}.
+     *
+     * The behavior of this method is undefined if {@code cpi} does not denote an entry representing
+     * a class.
+     *
+     * @throws LinkageError if resolution failed
+     */
+    native HotSpotResolvedObjectTypeImpl resolveTypeInPool(HotSpotConstantPool constantPool, int cpi) throws LinkageError;
+
+    /**
+     * Looks up and attempts to resolve the {@code JVM_CONSTANT_Field} entry at index {@code cpi} in
+     * {@code constantPool}. The values returned in {@code info} are:
+     *
+     * <pre>
+     *     [(int) flags,   // only valid if field is resolved
+     *      (int) offset]  // only valid if field is resolved
+     * </pre>
+     *
+     * The behavior of this method is undefined if {@code cpi} does not denote a
+     * {@code JVM_CONSTANT_Field} entry.
+     *
+     * @param info an array in which the details of the field are returned
+     * @return the type defining the field if resolution is successful, 0 otherwise
+     */
+    native HotSpotResolvedObjectTypeImpl resolveFieldInPool(HotSpotConstantPool constantPool, int cpi, byte opcode, long[] info);
+
+    /**
+     * Converts {@code cpci} from an index into the cache for {@code constantPool} to an index
+     * directly into {@code constantPool}.
+     *
+     * The behavior of this method is undefined if {@code ccpi} is an invalid constant pool cache
+     * index.
+     */
+    native int constantPoolRemapInstructionOperandFromCache(HotSpotConstantPool constantPool, int cpci);
+
+    /**
+     * Gets the appendix object (if any) associated with the entry at index {@code cpi} in
+     * {@code constantPool}.
+     */
+    native Object lookupAppendixInPool(HotSpotConstantPool constantPool, int cpi);
+
+    /**
+     * Installs the result of a compilation into the code cache.
+     *
+     * @param target the target where this code should be installed
+     * @param compiledCode the result of a compilation
+     * @param code the details of the installed CodeBlob are written to this object
+     * @return the outcome of the installation which will be one of
+     *         {@link HotSpotVMConfig#codeInstallResultOk},
+     *         {@link HotSpotVMConfig#codeInstallResultCacheFull},
+     *         {@link HotSpotVMConfig#codeInstallResultCodeTooLarge},
+     *         {@link HotSpotVMConfig#codeInstallResultDependenciesFailed} or
+     *         {@link HotSpotVMConfig#codeInstallResultDependenciesInvalid}.
+     */
+    native int installCode(TargetDescription target, HotSpotCompiledCode compiledCode, InstalledCode code, SpeculationLog speculationLog);
+
+    /**
+     * Notifies the VM of statistics for a completed compilation.
+     *
+     * @param id the identifier of the compilation
+     * @param method the method compiled
+     * @param osr specifies if the compilation was for on-stack-replacement
+     * @param processedBytecodes the number of bytecodes processed during the compilation, including
+     *            the bytecodes of all inlined methods
+     * @param time the amount time spent compiling {@code method}
+     * @param timeUnitsPerSecond the granularity of the units for the {@code time} value
+     * @param installedCode the nmethod installed as a result of the compilation
+     */
+    synchronized native void notifyCompilationStatistics(int id, HotSpotResolvedJavaMethodImpl method, boolean osr, int processedBytecodes, long time, long timeUnitsPerSecond,
+                    InstalledCode installedCode);
+
+    /**
+     * Resets all compilation statistics.
+     */
+    native void resetCompilationStatistics();
+
+    /**
+     * Initializes the fields of {@code config}.
+     */
+    native void initializeConfiguration(HotSpotVMConfig config);
+
+    /**
+     * Resolves the implementation of {@code method} for virtual dispatches on objects of dynamic
+     * type {@code exactReceiver}. This resolution process only searches "up" the class hierarchy of
+     * {@code exactReceiver}.
+     *
+     * @param caller the caller or context type used to perform access checks
+     * @return the link-time resolved method (might be abstract) or {@code 0} if it can not be
+     *         linked
+     */
+    native HotSpotResolvedJavaMethodImpl resolveMethod(HotSpotResolvedObjectTypeImpl exactReceiver, HotSpotResolvedJavaMethodImpl method, HotSpotResolvedObjectTypeImpl caller);
+
+    /**
+     * Gets the static initializer of {@code type}.
+     *
+     * @return 0 if {@code type} has no static initializer
+     */
+    native HotSpotResolvedJavaMethodImpl getClassInitializer(HotSpotResolvedObjectTypeImpl type);
+
+    /**
+     * Determines if {@code type} or any of its currently loaded subclasses overrides
+     * {@code Object.finalize()}.
+     */
+    native boolean hasFinalizableSubclass(HotSpotResolvedObjectTypeImpl type);
+
+    /**
+     * Gets the method corresponding to {@code holder} and slot number {@code slot} (i.e.
+     * {@link Method#slot} or {@link Constructor#slot}).
+     */
+    native HotSpotResolvedJavaMethodImpl getResolvedJavaMethodAtSlot(Class<?> holder, int slot);
+
+    /**
+     * Gets the maximum absolute offset of a PC relative call to {@code address} from any position
+     * in the code cache.
+     *
+     * @param address an address that may be called from any code in the code cache
+     * @return -1 if {@code address == 0}
+     */
+    native long getMaxCallTargetOffset(long address);
+
+    /**
+     * Gets a textual disassembly of {@code codeBlob}.
+     *
+     * @return a non-zero length string containing a disassembly of {@code codeBlob} or null if
+     *         {@code codeBlob} could not be disassembled for some reason
+     */
+    // The HotSpot disassembler seems not to be thread safe so it's better to synchronize its usage
+    synchronized native String disassembleCodeBlob(InstalledCode installedCode);
+
+    /**
+     * Gets a stack trace element for {@code method} at bytecode index {@code bci}.
+     */
+    native StackTraceElement getStackTraceElement(HotSpotResolvedJavaMethodImpl method, int bci);
+
+    /**
+     * Executes some {@code installedCode} with arguments {@code args}.
+     *
+     * @return the result of executing {@code installedCode}
+     * @throws InvalidInstalledCodeException if {@code installedCode} has been invalidated
+     */
+    native Object executeInstalledCode(Object[] args, InstalledCode installedCode) throws InvalidInstalledCodeException;
+
+    /**
+     * Gets the line number table for {@code method}. The line number table is encoded as (bci,
+     * source line number) pairs.
+     *
+     * @return the line number table for {@code method} or null if it doesn't have one
+     */
+    native long[] getLineNumberTable(HotSpotResolvedJavaMethodImpl method);
+
+    /**
+     * Gets the number of entries in the local variable table for {@code method}.
+     *
+     * @return the number of entries in the local variable table for {@code method}
+     */
+    native int getLocalVariableTableLength(HotSpotResolvedJavaMethodImpl method);
+
+    /**
+     * Gets the address of the first entry in the local variable table for {@code method}.
+     *
+     * Each entry is a native object described by these fields:
+     *
+     * <ul>
+     * <li>{@link HotSpotVMConfig#localVariableTableElementSize}</li>
+     * <li>{@link HotSpotVMConfig#localVariableTableElementLengthOffset}</li>
+     * <li>{@link HotSpotVMConfig#localVariableTableElementNameCpIndexOffset}</li>
+     * <li>{@link HotSpotVMConfig#localVariableTableElementDescriptorCpIndexOffset}</li>
+     * <li>{@link HotSpotVMConfig#localVariableTableElementSignatureCpIndexOffset}
+     * <li>{@link HotSpotVMConfig#localVariableTableElementSlotOffset}
+     * <li>{@link HotSpotVMConfig#localVariableTableElementStartBciOffset}
+     * </ul>
+     *
+     * @return 0 if {@code method} does not have a local variable table
+     */
+    native long getLocalVariableTableStart(HotSpotResolvedJavaMethodImpl method);
+
+    /**
+     * Reads an object pointer within a VM data structure. That is, any {@link HotSpotVMField} whose
+     * {@link HotSpotVMField#type() type} is {@code "oop"} (e.g.,
+     * {@code ArrayKlass::_component_mirror}, {@code Klass::_java_mirror},
+     * {@code JavaThread::_threadObj}).
+     *
+     * Note that {@link Unsafe#getObject(Object, long)} cannot be used for this since it does a
+     * {@code narrowOop} read if the VM is using compressed oops whereas oops within VM data
+     * structures are (currently) always uncompressed.
+     *
+     * @param address address of an oop field within a VM data structure
+     */
+    native Object readUncompressedOop(long address);
+
+    /**
+     * Determines if {@code method} should not be inlined or compiled.
+     */
+    native void doNotInlineOrCompile(HotSpotResolvedJavaMethodImpl method);
+
+    /**
+     * Invalidates the profiling information for {@code method} and (re)initializes it such that
+     * profiling restarts upon its next invocation.
+     */
+    native void reprofile(HotSpotResolvedJavaMethodImpl method);
+
+    /**
+     * Invalidates {@code installedCode} such that {@link InvalidInstalledCodeException} will be
+     * raised the next time {@code installedCode} is executed.
+     */
+    native void invalidateInstalledCode(InstalledCode installedCode);
+
+    /**
+     * Collects the current values of all JVMCI benchmark counters, summed up over all threads.
+     */
+    native long[] collectCounters();
+
+    /**
+     * Determines if {@code metaspaceMethodData} is mature.
+     */
+    native boolean isMature(long metaspaceMethodData);
+
+    /**
+     * Generate a unique id to identify the result of the compile.
+     */
+    native int allocateCompileId(HotSpotResolvedJavaMethodImpl method, int entryBCI);
+
+    /**
+     * Determines if {@code method} has OSR compiled code identified by {@code entryBCI} for
+     * compilation level {@code level}.
+     */
+    native boolean hasCompiledCodeForOSR(HotSpotResolvedJavaMethodImpl method, int entryBCI, int level);
+
+    /**
+     * Gets the value of {@code metaspaceSymbol} as a String.
+     */
+    native String getSymbol(long metaspaceSymbol);
+
+    /**
+     * Looks for the next Java stack frame matching an entry in {@code methods}.
+     *
+     * @param frame the starting point of the search, where {@code null} refers to the topmost frame
+     * @param methods the methods to look for, where {@code null} means that any frame is returned
+     * @return the frame, or {@code null} if the end of the stack was reached during the search
+     */
+    native HotSpotStackFrameReference getNextStackFrame(HotSpotStackFrameReference frame, ResolvedJavaMethod[] methods, int initialSkip);
+
+    /**
+     * Materializes all virtual objects within {@code stackFrame} updates its locals.
+     *
+     * @param invalidate if {@code true}, the compiled method for the stack frame will be
+     *            invalidated.
+     */
+    native void materializeVirtualObjects(HotSpotStackFrameReference stackFrame, boolean invalidate);
+
+    /**
+     * Gets the v-table index for interface method {@code method} in the receiver {@code type} or
+     * {@link HotSpotVMConfig#invalidVtableIndex} if {@code method} is not in {@code type}'s
+     * v-table.
+     *
+     * @throws InternalError if {@code type} is an interface or {@code method} is not held by an
+     *             interface or class represented by {@code type} is not initialized
+     */
+    native int getVtableIndexForInterfaceMethod(HotSpotResolvedObjectTypeImpl type, HotSpotResolvedJavaMethodImpl method);
+
+    /**
+     * Determines if debug info should also be emitted at non-safepoint locations.
+     */
+
+    native boolean shouldDebugNonSafepoints();
+
+    /**
+     * Writes {@code length} bytes from {@code bytes} starting at offset {@code offset} to the
+     * HotSpot's log stream.
+     *
+     * @exception NullPointerException if {@code bytes == null}
+     * @exception IndexOutOfBoundsException if copying would cause access of data outside array
+     *                bounds
+     */
+    native void writeDebugOutput(byte[] bytes, int offset, int length);
+
+    /**
+     * Flush HotSpot's log stream.
+     */
+    native void flushDebugOutput();
+
+    /**
+     * Read a HotSpot Method* value from the memory location described by {@code base} plus
+     * {@code displacement} and return the {@link HotSpotResolvedJavaMethodImpl} wrapping it. This
+     * method does no checking that the memory location actually contains a valid pointer and may
+     * crash the VM if an invalid location is provided. If the {@code base} is null then
+     * {@code displacement} is used by itself. If {@code base} is a
+     * {@link HotSpotResolvedJavaMethodImpl}, {@link HotSpotConstantPool} or
+     * {@link HotSpotResolvedObjectTypeImpl} then the metaspace pointer is fetched from that object
+     * and added to {@code displacement}. Any other non-null object type causes an
+     * {@link IllegalArgumentException} to be thrown.
+     *
+     * @param base an object to read from or null
+     * @param displacement
+     * @return null or the resolved method for this location
+     */
+    native HotSpotResolvedJavaMethodImpl getResolvedJavaMethod(Object base, long displacement);
+
+    /**
+     * Read a HotSpot ConstantPool* value from the memory location described by {@code base} plus
+     * {@code displacement} and return the {@link HotSpotConstantPool} wrapping it. This method does
+     * no checking that the memory location actually contains a valid pointer and may crash the VM
+     * if an invalid location is provided. If the {@code base} is null then {@code displacement} is
+     * used by itself. If {@code base} is a {@link HotSpotResolvedJavaMethodImpl},
+     * {@link HotSpotConstantPool} or {@link HotSpotResolvedObjectTypeImpl} then the metaspace
+     * pointer is fetched from that object and added to {@code displacement}. Any other non-null
+     * object type causes an {@link IllegalArgumentException} to be thrown.
+     *
+     * @param base an object to read from or null
+     * @param displacement
+     * @return null or the resolved method for this location
+     */
+    native HotSpotConstantPool getConstantPool(Object base, long displacement);
+
+    /**
+     * Read a HotSpot Klass* value from the memory location described by {@code base} plus
+     * {@code displacement} and return the {@link HotSpotResolvedObjectTypeImpl} wrapping it. This
+     * method does no checking that the memory location actually contains a valid pointer and may
+     * crash the VM if an invalid location is provided. If the {@code base} is null then
+     * {@code displacement} is used by itself. If {@code base} is a
+     * {@link HotSpotResolvedJavaMethodImpl}, {@link HotSpotConstantPool} or
+     * {@link HotSpotResolvedObjectTypeImpl} then the metaspace pointer is fetched from that object
+     * and added to {@code displacement}. Any other non-null object type causes an
+     * {@link IllegalArgumentException} to be thrown.
+     *
+     * @param base an object to read from or null
+     * @param displacement
+     * @param compressed true if the location contains a compressed Klass*
+     * @return null or the resolved method for this location
+     */
+    native HotSpotResolvedObjectTypeImpl getResolvedJavaType(Object base, long displacement, boolean compressed);
+
+    /**
+     * @param metaspaceMethodData
+     * @param position
+     * @return Return the size of the ProfileData item pointed at by {@code current}. Throws
+     *         {@link IllegalArgumentException} if an invalid position is given.
+     */
+    native int methodDataProfileDataSize(long metaspaceMethodData, int position);
+}