| /* |
| * 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 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); |
| |
| /** |
| * 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); |
| |
| /** |
| * 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} 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); |
| } |
