--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.internal.vm.ci/share/classes/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/CompilerToVM.java Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,652 @@
+/*
+ * Copyright (c) 2011, 2016, 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.common.InitTimer.timer;
+import static jdk.vm.ci.hotspot.HotSpotJVMCIRuntime.runtime;
+
+import java.lang.reflect.Executable;
+
+import jdk.vm.ci.code.BytecodeFrame;
+import jdk.vm.ci.code.InstalledCode;
+import jdk.vm.ci.code.InvalidInstalledCodeException;
+import jdk.vm.ci.code.TargetDescription;
+import jdk.vm.ci.common.InitTimer;
+import jdk.vm.ci.common.JVMCIError;
+import jdk.vm.ci.meta.JavaType;
+import jdk.vm.ci.meta.ResolvedJavaMethod;
+import jdk.vm.ci.meta.ResolvedJavaType;
+
+/**
+ * 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 no
+ * 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 whether {@code method} is currently compilable by the JVMCI compiler being used by
+ * the VM. This can return false if JVMCI compilation failed earlier for {@code method}, a
+ * breakpoint is currently set in {@code method} or {@code method} contains other bytecode
+ * features that require special handling by the VM.
+ */
+ native boolean isCompilable(HotSpotResolvedJavaMethodImpl method);
+
+ /**
+ * Determines if {@code method} is targeted by a VM directive (e.g.,
+ * {@code -XX:CompileCommand=dontinline,<pattern>}) or annotation (e.g.,
+ * {@code jdk.internal.vm.annotation.DontInline}) that specifies it should not be inlined.
+ */
+ native boolean hasNeverInlineDirective(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 ClassNotFoundException if {@code resolve == true} and the resolution failed
+ */
+ native HotSpotResolvedObjectTypeImpl lookupType(String name, Class<?> accessingClass, boolean resolve) throws ClassNotFoundException;
+
+ /**
+ * 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);
+
+ /**
+ * If {@code cpi} denotes an entry representing a
+ * <a href="https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-2.html#jvms-2.9">signature
+ * polymorphic</a> method, this method ensures that the type referenced by the entry is loaded
+ * and initialized. It {@code cpi} does not denote a signature polymorphic method, this method
+ * does nothing.
+ */
+ native void resolveInvokeHandleInPool(HotSpotConstantPool constantPool, int cpi);
+
+ /**
+ * Gets the list of type names (in the format of {@link JavaType#getName()}) denoting the
+ * classes that define signature polymorphic methods.
+ */
+ native String[] getSignaturePolymorphicHolders();
+
+ /**
+ * 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 for at index
+ * {@code cpi} in {@code constantPool}. For some opcodes, checks are performed that require the
+ * {@code method} that contains {@code opcode} to be specified. The values returned in
+ * {@code info} are:
+ *
+ * <pre>
+ * [ flags, // fieldDescriptor::access_flags()
+ * offset, // fieldDescriptor::offset()
+ * index // fieldDescriptor::index()
+ * ]
+ * </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, HotSpotResolvedJavaMethodImpl method, byte opcode, int[] 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}.
+ * @throws JVMCIError if there is something wrong with the compiled code or the associated
+ * metadata.
+ */
+ native int installCode(TargetDescription target, HotSpotCompiledCode compiledCode, InstalledCode code, HotSpotSpeculationLog speculationLog);
+
+ /**
+ * Generates the VM metadata for some compiled code and copies them into {@code metaData}. This
+ * method does not install anything into the code cache.
+ *
+ * @param target the target where this code would be installed
+ * @param compiledCode the result of a compilation
+ * @param metaData the metadata is 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}.
+ * @throws JVMCIError if there is something wrong with the compiled code or the metadata
+ */
+ native int getMetadata(TargetDescription target, HotSpotCompiledCode compiledCode, HotSpotMetaData metaData);
+
+ /**
+ * Resets all compilation statistics.
+ */
+ native void resetCompilationStatistics();
+
+ /**
+ * Reads the database of VM info. The return value encodes the info in a nested object array
+ * that is described by the pseudo Java object {@code info} below:
+ *
+ * <pre>
+ * info = [
+ * VMField[] vmFields,
+ * [String name, Long size, ...] vmTypeSizes,
+ * [String name, Long value, ...] vmConstants,
+ * [String name, Long value, ...] vmAddresses,
+ * VMFlag[] vmFlags
+ * VMIntrinsicMethod[] vmIntrinsics
+ * ]
+ * </pre>
+ *
+ * @return VM info as encoded above
+ */
+ native Object[] readConfiguration();
+
+ /**
+ * 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 null} if it is either a
+ * signature polymorphic method or 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 executable}.
+ */
+ native HotSpotResolvedJavaMethodImpl asResolvedJavaMethod(Executable executable);
+
+ /**
+ * 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#localVariableTableElementSlotOffset}
+ * <li>{@link HotSpotVMConfig#localVariableTableElementStartBciOffset}
+ * </ul>
+ *
+ * @return 0 if {@code method} does not have a local variable table
+ */
+ native long getLocalVariableTableStart(HotSpotResolvedJavaMethodImpl method);
+
+ /**
+ * Sets flags on {@code method} indicating that it should never be inlined or compiled by the VM.
+ */
+ native void setNotInlineableOrCompileable(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} and 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);
+
+ /**
+ * Gets the {@code ConstantPool*} associated with {@code object} and returns a
+ * {@link HotSpotConstantPool} wrapping it.
+ *
+ * @param object a {@link HotSpotResolvedJavaMethodImpl} or
+ * {@link HotSpotResolvedObjectTypeImpl} object
+ * @return a {@link HotSpotConstantPool} wrapping the {@code ConstantPool*} associated with
+ * {@code object}
+ * @throws NullPointerException if {@code object == null}
+ * @throws IllegalArgumentException if {@code object} is neither a
+ * {@link HotSpotResolvedJavaMethodImpl} nor a {@link HotSpotResolvedObjectTypeImpl}
+ */
+ native HotSpotConstantPool getConstantPool(Object object);
+
+ /**
+ * 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);
+
+ /**
+ * Return the size of the HotSpot ProfileData* pointed at by {@code position}. If
+ * {@code position} is outside the space of the MethodData then an
+ * {@link IllegalArgumentException} is thrown. A {@code position} inside the MethodData but that
+ * isn't pointing at a valid ProfileData will crash the VM.
+ *
+ * @param metaspaceMethodData
+ * @param position
+ * @return the size of the ProfileData item pointed at by {@code position}
+ * @throws IllegalArgumentException if an out of range position is given
+ */
+ native int methodDataProfileDataSize(long metaspaceMethodData, int position);
+
+ /**
+ * Gets the fingerprint for a given Klass*
+ *
+ * @param metaspaceKlass
+ * @return the value of the fingerprint (zero for arrays and synthetic classes).
+ */
+ native long getFingerprint(long metaspaceKlass);
+
+ /**
+ * Return the amount of native stack required for the interpreter frames represented by
+ * {@code frame}. This is used when emitting the stack banging code to ensure that there is
+ * enough space for the frames during deoptimization.
+ *
+ * @param frame
+ * @return the number of bytes required for deoptimization of this frame state
+ */
+ native int interpreterFrameSize(BytecodeFrame frame);
+
+ /**
+ * Invokes non-public method {@code java.lang.invoke.LambdaForm.compileToBytecode()} on
+ * {@code lambdaForm} (which must be a {@code java.lang.invoke.LambdaForm} instance).
+ */
+ native void compileToBytecode(Object lambdaForm);
+
+ /**
+ * Gets the value of the VM flag named {@code name}.
+ *
+ * @param name name of a VM option
+ * @return {@code this} if the named VM option doesn't exist, a {@link String} or {@code null}
+ * if its type is {@code ccstr} or {@code ccstrlist}, a {@link Double} if its type is
+ * {@code double}, a {@link Boolean} if its type is {@code bool} otherwise a
+ * {@link Long}
+ */
+ native Object getFlagValue(String name);
+
+ /**
+ * Gets the host class for {@code type}.
+ */
+ native HotSpotResolvedObjectTypeImpl getHostClass(HotSpotResolvedObjectTypeImpl type);
+}