/*******************************************************************************
 * Copyright IBM Corp. and others 1991
 *
 * This program and the accompanying materials are made available under
 * the terms of the Eclipse Public License 2.0 which accompanies this
 * distribution and is available at https://www.eclipse.org/legal/epl-2.0/
 * or the Apache License, Version 2.0 which accompanies this distribution and
 * is available at https://www.apache.org/licenses/LICENSE-2.0.
 *
 * This Source Code may also be made available under the following
 * Secondary Licenses when the conditions for such availability set
 * forth in the Eclipse Public License, v. 2.0 are satisfied: GNU
 * General Public License, version 2 with the GNU Classpath
 * Exception [1] and GNU General Public License, version 2 with the
 * OpenJDK Assembly Exception [2].
 *
 * [1] https://www.gnu.org/software/classpath/license.html
 * [2] https://openjdk.org/legal/assembly-exception.html
 *
 * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0-only WITH Classpath-exception-2.0 OR GPL-2.0-only WITH OpenJDK-assembly-exception-1.0
 *******************************************************************************/

#ifndef vm_api_h
#define vm_api_h

/**
* @file vm_api.h
* @brief Public API for the VM module.
*
* This file contains public function prototypes and
* type definitions for the VM module.
*/

#include "j9.h"
#include "j9comp.h"
#include "jni.h"
#include "omrthread.h"
#if defined(J9VM_OPT_SNAPSHOTS)
#include "SnapshotFileFormat.h"
#endif /* defined(J9VM_OPT_SNAPSHOTS) */

#ifdef __cplusplus
extern "C" {
#endif

#define J9_CREATEJAVAVM_VERBOSE_INIT 1
#define J9_CREATEJAVAVM_ARGENCODING_LATIN 2
#define J9_CREATEJAVAVM_ARGENCODING_UTF8 4
#define J9_CREATEJAVAVM_ARGENCODING_PLATFORM 8
#define J9_CREATEJAVAVM_START_JITSERVER 16
#define J9_CREATEJAVAVM_SNAPSHOT 32

#define HELPER_TYPE_MONITOR_WAIT_INTERRUPTABLE 1
#define HELPER_TYPE_MONITOR_WAIT_TIMED         2
#define HELPER_TYPE_THREAD_PARK                3
#define HELPER_TYPE_THREAD_SLEEP               4

typedef struct J9CreateJavaVMParams {
	UDATA j2seVersion;
	UDATA threadDllHandle;
	char* j2seRootDirectory;
	char* j9libvmDirectory;
	struct J9VMInitArgs* vm_args;
	J9JavaVM **globalJavaVM;
	J9PortLibrary *portLibrary;
	UDATA flags;
#if defined(J9VM_OPT_SNAPSHOTS)
	const char *vmSnapshotFilePath;
#endif /* defined(J9VM_OPT_SNAPSHOTS) */
} J9CreateJavaVMParams;

/* ---------------- FastJNI.cpp ---------------- */

/**
 * Determine the properties of a JNI native method.
 *
 * @param[in] currentThread the current J9VMThread
 * @param[in] jniNativeMethod JNI native method to query
 * @param[out] properties bitfield representing the optimizations to apply to this method
 *
 * @return  The address of the JNI native to encode in the compiled code, or NULL if the method is not a bound JNI native
 */
void*
jniNativeMethodProperties(J9VMThread *currentThread, J9Method *jniNativeMethod, UDATA *properties);

/* ---------------- annsup.c ---------------- */

/**
* @brief
* @param *state
* @param **data
* @return J9UTF8 *
*/
J9UTF8 *
annotationElementIteratorNext(J9AnnotationState *state, void **data);


/**
* @brief
* @param *state
* @param *annotation
* @param **data
* @return J9UTF8 *
*/
J9UTF8 *
annotationElementIteratorStart(J9AnnotationState *state, J9AnnotationInfoEntry *annotation, void **data);


/**
* @brief
* @param *state
* @return void *
*/
void *
elementArrayIteratorNext(J9AnnotationState *state);


/**
* @brief
* @param *state
* @param start
* @param count
* @return void *
*/
void *
elementArrayIteratorStart(J9AnnotationState *state, UDATA start, U_32 count);


/**
* @brief
* @param *annInfo
* @param **annotations
* @return UDATA
*/
UDATA
getAllAnnotationsFromAnnotationInfo(J9AnnotationInfo *annInfo, J9AnnotationInfoEntry **annotations);


/**
* @brief
* @param *currentThread
* @param *containingClass
* @param *annotation
* @param flags
* @return J9AnnotationInfoEntry *
*/
J9AnnotationInfoEntry *
getAnnotationDefaultsForAnnotation(J9VMThread *currentThread, J9Class *containingClass, J9AnnotationInfoEntry *annotation, UDATA flags);


/**
* @brief
* @param *currentThread
* @param *containingClass
* @param *className
* @param classNameLength
* @param flags
* @return J9AnnotationInfoEntry *
*/
J9AnnotationInfoEntry *
getAnnotationDefaultsForNamedAnnotation(J9VMThread *currentThread, J9Class *containingClass, char *className, U_32 classNameLength, UDATA flags);


/**
* @brief
* @param *annInfo
* @param annotationType
* @param *memberName
* @param memberNameLength
* @param *memberSignature
* @param memberSignatureLength
* @param *annotationName
* @param annotationNameLength
* @return J9AnnotationInfoEntry *
*/
J9AnnotationInfoEntry *
getAnnotationFromAnnotationInfo(J9AnnotationInfo *annInfo, UDATA annotationType, char *memberName, U_32 memberNameLength, char *memberSignature, U_32 memberSignatureLength, char *annotationName, U_32 annotationNameLength);


/**
* @brief
* @param *vm
* @param *clazz
* @return J9AnnotationInfo *
*/
J9AnnotationInfo *
getAnnotationInfoFromClass(J9JavaVM *vm, J9Class *clazz);


/**
* @brief
* @param *annInfo
* @param annotationType
* @param *memberName
* @param memberNameLength
* @param *memberSignature
* @param memberSignatureLength
* @param **annotations
* @return UDATA
*/
UDATA
getAnnotationsFromAnnotationInfo(J9AnnotationInfo *annInfo, UDATA annotationType, char *memberName, U_32 memberNameLength, char *memberSignature, U_32 memberSignatureLength, J9AnnotationInfoEntry **annotations);


/**
* @brief
* @param *annotation
* @param *name
* @param nameLength
* @return void *
*/
void *
getNamedElementFromAnnotation(J9AnnotationInfoEntry *annotation, char *name, U_32 nameLength);


/* ---------------- bchelper.c ---------------- */

/**
* @brief
* @param *vmStruct
* @param *classPtr
* @param dimensions
* @param *dimensionArray
* @param allocationType
* @return j9object_t
*/
j9object_t
helperMultiANewArray(J9VMThread *vmStruct, J9ArrayClass *classPtr, UDATA dimensions, I_32 *dimensionArray, UDATA allocationType);


/* ---------------- bindnatv.c ---------------- */

#if (defined(J9VM_NEEDS_JNI_REDIRECTION))
/**
* @brief
* @param vm
* @param address
* @param classLoader
* @return void *
*/
void *
alignJNIAddress(J9JavaVM * vm, void * address, J9ClassLoader * classLoader);
#endif /* J9VM_NEEDS_JNI_REDIRECTION */


/**
* @brief
* @param javaVM
* @param ramMethod
* @param ramClass
* @param nameOffset
* @return U_8*
*/
U_8*
buildNativeFunctionNames(J9JavaVM * javaVM, J9Method* ramMethod, J9Class* ramClass, UDATA nameOffset);


/**
* @brief
* @param vm
* @return UDATA
*/
UDATA
initializeNativeMethodBindTable(J9JavaVM *vm);


/**
* @brief
* @param vm
*/
void
freeNativeMethodBindTable(J9JavaVM *vm);


/**
* @brief
* @param currentThread
* @param nativeMethod
* @param runtimeBind
* @return UDATA
*/
UDATA
resolveNativeAddress(J9VMThread *currentThread, J9Method *nativeMethod, UDATA runtimeBind);


/* ---------------- classallocation.c ---------------- */

/**
* @brief Free the cached maps for a ClassLoader.
* @param classLoader The J9ClassLoader struct
*/
void
freeMapCaches(J9ClassLoader *classLoader);

/**
* @brief
*
* This method has potential GC point.
*
* @param *javaVM
* @param *classLoaderObject
* @return J9ClassLoader
*/
J9ClassLoader*
internalAllocateClassLoader(J9JavaVM *javaVM, j9object_t classLoaderObject) ;

/**
* @brief
* @param *javaVM
* @return J9ClassLoader*
*/
J9ClassLoader*
allocateClassLoader(J9JavaVM *javaVM);

/**
* @brief
* @param *classLoader
* @param *javaVM
* @param *vmThread
* @param needsFrameBuild
*/
void
freeClassLoader(J9ClassLoader *classLoader, J9JavaVM *javaVM, J9VMThread *vmThread, UDATA needsFrameBuild);

/* ---------------- classsname.cpp ---------------- */

/**
 * Get the String representing the name of a Class. If the String has not been created
 * yet, create it and optionally intern and assign it to the Class.
 *
 * Current thread must have VM access and have a special frame on top of stack
 * with the J9VMThread roots up-to-date.
 *
 * @param[in] currentThread the current J9VMThread
 * @param[in] classObject the java/lang/Class being queried
 * @param[im] internAndAssign if true, intern the String and assign it to the Class object
 * @return the Class name String, or NULL on out of memory (exception will be pending)
 */
j9object_t
getClassNameString(J9VMThread *currentThread, j9object_t classObject, jboolean internAndAssign);

/* ---------------- classsupport.c ---------------- */

/**
* @brief
* @param vmThread
* @param name
* @param length
* @return UDATA
*/
UDATA
calculateArity(J9VMThread* vmThread, U_8* name, UDATA length);

/**
* @brief
* @param currentThread
* @param classLoader
* @param className
* @param classNameLength
* @return UDATA
*/
J9Class*
peekClassHashTable(J9VMThread* currentThread, J9ClassLoader* classLoader, U_8* className, UDATA classNameLength);

/**
* @brief
* @param vmThread
* @param romClass
* @param elementClass
* @return J9Class*
*/
J9Class*
internalCreateArrayClass(J9VMThread* vmThread, J9ROMArrayClass* romClass, J9Class* elementClass);

/**
 * @brief Create a new J9Class to represent an array of elementClass.
 *
 * @param vmThread current VM thread
 * @param romClass the ROM class associated with new RAM class (for arrays
 * this is always the object array ROM class "[L")
 * @param elementClass element or base class or array to be created
 * @param options creation options such as J9_FINDCLASS_FLAG_CLASS_OPTION_NULL_RESTRICTED_ARRAY
 * @return J9Class* J9Class of an elementClass array
 */
J9Class *
internalCreateArrayClassWithOptions(J9VMThread *vmThread, J9ROMArrayClass *romClass, J9Class *elementClass, UDATA options);

/**
 * Load the class with the specified name in a given module
 *
 * This method has potential GC point.
 *
 * @param currentThread Current VM thread
 * @param moduleName j.l.String object representing module name; can be null
 * @param className String object representing name of the class to load
 * @param classLoader J9ClassLoader to use
 * @param options load options such as J9_FINDCLASS_FLAG_EXISTING_ONLY
 * @param allowedBitsForClassName the allowed bits for a valid class name,
 *        including CLASSNAME_INVALID, CLASSNAME_VALID_NON_ARRARY, CLASSNAME_VALID_ARRARY, or CLASSNAME_VALID.
 *
 * @return pointer to J9Class if success, NULL if fail
 *
 */
J9Class*
internalFindClassString(J9VMThread* currentThread, j9object_t moduleName, j9object_t className, J9ClassLoader* classLoader, UDATA options, UDATA allowedBitsForClassName);

/**
 * Load the class with the specified name in the given module.
 *
 * This method has potential GC point.
 *
 * @param currentThread Current VM thread
 * @param moduleName Pointer to J9Module representing the module containing the class
 * @param className Name of class to load
 * @param classNameLength Length of the class name
 * @param classLoader J9ClassLoader to use
 * @param options load options such as J9_FINDCLASS_FLAG_EXISTING_ONLY
 *
 * @return pointer to J9Class if success, NULL if fail
 *
 */
J9Class*
internalFindClassInModule(J9VMThread* vmThread, J9Module* j9module, U_8* className, UDATA classNameLength, J9ClassLoader* classLoader, UDATA options);

/**
 * It is a wrapper method of internalFindClassInModule().
 *
 * This method has potential GC point.
 *
 * @param vmThread Current VM thread
 * @param className Name of class to load
 * @param classNameLength Length of the class name
 * @param classLoader J9ClassLoader to use
 * @param options load options such as J9_FINDCLASS_FLAG_EXISTING_ONLY
 *
 * @return pointer to J9Class if success, NULL if fail
 */
J9Class*
internalFindClassUTF8(J9VMThread* vmThread, U_8* className, UDATA classNameLength, J9ClassLoader* classLoader, UDATA options);

/**
 * Get the class for the index, loading and initializing the class if necessary.
 *
 * This method has potential GC point.
 *
 * @param vmThread Current VM thread
 * @param index The class index
 * @param flags The J9_FINDKNOWNCLASS_FLAG
 *
 * @return pointer to J9Class if success, NULL if fail
 */
J9Class*
internalFindKnownClass(J9VMThread *vmThread, UDATA index, UDATA flags);

/**
* @brief
* @param *romClass
* @return UDATA
*/
UDATA
totalStaticSlotsForClass( J9ROMClass *romClass );


/**
* @brief
* @param *ramClass
* @param *vmThread
*/
void
internalRunPreInitInstructions(J9Class * ramClass, J9VMThread * vmThread);


/**
* @brief
* @param vm
* @param index
* @return J9Class*
*/
J9Class*
resolveKnownClass(J9JavaVM * vm, UDATA index);

/**
* @brief
* @param vm
* @param portLib
* @return J9HashTable*
*/
J9HashTable *
contendedLoadTableNew(J9JavaVM* vm, J9PortLibrary *portLib);

/**
* @brief
* @param vm
*/
void
contendedLoadTableFree(J9JavaVM* vm);

/* ---------------- createramclass.c ---------------- */

/**
 * Use this if you don't have the class path index.
 */
#define J9_CP_INDEX_NONE -1
/**
 * Use this to peek the package ID table
 */
#define J9_CP_INDEX_PEEK -2

/**
 * Checks stack to see if element exists, if not adds the new element and returns TRUE. Otherwise, returns FALSE
 *
 * @param vmThread vmthread token
 * @param classloader loader associated with current element
 * @param clazz either romclass or ramclass
 * @param stack the loading or linking stack
 * @param comparator handle to function that will compare elements
 * @param maxStack maximum concurrent classloads or class linkage
 * @param stackpool pool for stack elements
 * @param throwException flag to indicate if exception should be thrown in the case of cirularity
 * @param ownsClassTableMutex flag to indicate if class table mutex is being held
 * @result TRUE is element exists in stack, FALSE otherwise
 */
BOOLEAN
verifyLoadingOrLinkingStack(J9VMThread *vmThread, J9ClassLoader *classLoader, void *clazz,
		J9StackElement **stack, BOOLEAN (*comparator)(void *, J9StackElement *), UDATA maxStack,
		J9Pool *stackpool, BOOLEAN throwException, BOOLEAN ownsClassTableMutex);

/**
 * Pops entry from stack
 *
 * @param vmThread vmthread token
 * @param stack the loading or linking stack
 * @param stackpool pool for stack elements
 */
void
popLoadingOrLinkingStack(J9VMThread *vmThread, J9StackElement **stack, J9Pool *stackpool);

/**
* @brief
* @param *vmThread
* @param *classLoader
* @param *romClass
* @param options
* @param *elementClass
* @param protectionDomain
* @param **methodRemapArray
* @param entryIndex
* @param locationType
* @return J9Class*
*/
J9Class *
internalCreateRAMClassFromROMClass(J9VMThread *vmThread, J9ClassLoader *classLoader, J9ROMClass *romClass,
	UDATA options, J9Class* elementClass, j9object_t protectionDomain, J9ROMMethod ** methodRemapArray,
	IDATA entryIndex, I_32 locationType, J9Class *classBeingRedefined, J9Class *hostClass);


#if defined(J9VM_OPT_CRIU_SUPPORT)

/* ---------------- CRIUHelpers.cpp ---------------- */
/**
 * @brief Queries if CRaC or CRIU support is enabled. By default support
 * is not enabled, it can be enabled with -XX:CRaCCheckpointTo or -XX:+EnableCRIUSupport.
 *
 * @param vm javaVM token
 * @return TRUE if enabled, FALSE otherwise
 */
BOOLEAN
isCRaCorCRIUSupportEnabled(J9JavaVM *vm);

/**
 * @brief Queries if CRIU support is enabled. By default support
 * is not enabled, it can be enabled with -XX:+EnableCRIUSupport.
 *
 * @param currentThread vmthread token
 * @return TRUE if enabled, FALSE otherwise
 */
BOOLEAN
isCRIUSupportEnabled(J9VMThread *currentThread);

/**
 * @brief Queries if the time compensation is enabled.
 * By default the time compensation is enabled, it can be disabled with -XX:-EnableTimeCompensation.
 *
 * @param currentThread vmthread token
 * @return TRUE if enabled, FALSE otherwise
 */
BOOLEAN
isTimeCompensationEnabled(J9VMThread *currentThread);

/**
 * @brief Checks if the CRIU security provider is enabled when CRIU
 * checkpoints are allowed. By default it is enabled, it can be disabled with
 * -XX:-CRIUSecProvider.
 *
 * @param currentThread vmthread token
 * @return TRUE if enabled, FALSE otherwise
 */
BOOLEAN
enableCRIUSecProvider(J9VMThread *currentThread);

/**
 * @brief Queries if checkpointing is permitted. Note, when
 * -XX:+CRIURestoreNonPortableMode option is specified checkpointing
 * will not be permitted after the JVM has been restored from a checkpoint
 * (checkpoint once mode).
 *
 * @param vm javaVM token
 * @return TRUE if permitted, FALSE otherwise
 */
BOOLEAN
isCheckpointAllowed(J9JavaVM *vm);

/**
 * @brief Queries if non-portable restore mode (specified via
 * -XX:+CRIURestoreNonPortableMode) is enabled. If so, checkpointing will
 * not be permitted after the JVM has been restored from a checkpoint
 * (checkpoint once mode).
 *
 * @param currentThread vmthread token
 * @return TRUE if enabled, FALSE otherwise
 */
BOOLEAN
isNonPortableRestoreMode(J9VMThread *currentThread);

/**
 * @brief Queries if portable restore mode (specified via
 * -XX:+JVMPortableRestoreMode) is enabled. If so, the JVM
 * will remain in portable mode after restore. However, this
 * will have no impact on the JCL and taking another checkpoint
 * will still not be permitted.
 *
 * @param currentThread vmthread token
 * @return TRUE if enabled, FALSE otherwise
 */
BOOLEAN
isJVMInPortableRestoreMode(J9VMThread *currentThread);

/**
 * @brief This is a helper to query if debug on restore mode is enabled.
 *
 * A few use scenarios:
 * 1. If CRIU is not enabled, FSD is disabled by default unless JDWP or some
 *    debug-specific flags/events are enabled/hooked, there is no notion of
 *    DebugOnRestore;
 * 2. If CRIU is enabled (via -XX:+EnableCRIUSupport) but -XX:+DebugOnRestore
 *    is not specified, this is the same as use case #1;
 * 3. If CRIU is enabled and -XX:+DebugOnRestore is specified,
 *    3.1 If JDWP or some debug-specific flags/events are enabled/hooked, FSD
 *        mode is enabled, and JIT doesn't do any pre-emptive recompilation
 *        and debugging is enabled.
 *    3.2 Otherwise FSD code is generated but FSD mode is not enabled,
 *        3.2.1 If FSD is enabled via the post-restore option file, JIT will
 *              transmit to the interpreter as soon as possible, or VM triggers
 *              a transition via the FSD code generated pre-checkpoint;
 *        3.2.2 Otherwise JIT throws all FSD code and uses the pre-emptively
 *              recompiled code in default mode.
 *
 * This helper method returns TRUE if CRIU is enabled, -XX:+DebugOnRestore is
 * specified, JDWP is not enabled, and no debug-specific flags/events are
 * enabled/hooked. JIT generates FSD code but FSD mode is not enabled.
 * Otherwise, this returns FALSE, JIT checks if debug related flags/events are
 * enabled/hooked and determines if FSD mode is to be enabled.
 *
 * @param vm javaVM token
 * @return TRUE if enabled, FALSE otherwise
 */
BOOLEAN
isDebugOnRestoreEnabled(J9JavaVM *vm);

/**
 * @brief This is a helper to query if the debug agent is disabled.
 *
 * @param vm javaVM token
 * @return TRUE if isDebugOnRestoreEnabled() and isCheckpointAllowed() return TRUE,
 *         FALSE otherwise
 */
BOOLEAN
isDebugAgentDisabled(J9JavaVM *vm);

/**
 * @brief Sets the maximum size for the CRIU ghost files.
 * If the new limit is smaller or equal to the previous limit,
 * then this function does nothing.
 * @param currentThread vmthread token
 * @param ghostFileLimit the new size limit for ghost files
 */
void
setRequiredGhostFileLimit(J9VMThread *currentThread, U_32 ghostFileLimit);

/**
 * @brief JVM hooks to run before performing a JVM checkpoint
 *
 * @param currentThread vmthread token
 * @return TRUE on success, FALSE otherwise
 */
BOOLEAN
jvmCheckpointHooks(J9VMThread *currentThread);

/**
 * @brief JVM hooks to run after performing a JVM checkpoint. If
 * there is a fatal error, the process will terminate.
 *
 * @param currentThread vmthread token
 * @return TRUE on success, FALSE otherwise
 */
BOOLEAN
jvmRestoreHooks(J9VMThread *currentThread);

/**
 * @brief This iterates heap objects first, then goes through hook records,
 * and runs the checkpoint hook function.
 * ExclusiveVMAccess is required since J9InternalHookRecord holds live object references
 * and GC is not allowed while running these hook functions.
 *
 * @param[in] currentThread vmthread token
 * @param[in/out] nlsMsgFormat an NLS message
 *
 * @return BOOLEAN TRUE if no error, otherwise FALSE
 */
BOOLEAN
runInternalJVMCheckpointHooks(J9VMThread *currentThread, const char **nlsMsgFormat);

/**
 * @brief This runs the restore hook function, and cleanup.
 * ExclusiveVMAccess is required since J9InternalHookRecord hold live object references
 * and GC are not allowed while running these hook functions.
 *
 * @param[in] currentThread vmthread token
 * @param[in] isRestore If FALSE, run the hook specified for checkpoint, otherwise run the hook specified for restore
 * @param[in/out] nlsMsgFormat an NLS message
 *
 * @return BOOLEAN TRUE if no error, otherwise FALSE
 */
BOOLEAN
runInternalJVMRestoreHooks(J9VMThread *currentThread, const char **nlsMsgFormat);

/**
 * @brief This function runs the identity operations that were delayed
 * during the Java checkpoint and restore hooks.
 *
 * @param currentThread thread token
 * @return BOOLEAN TRUE if no error, otherwise FALSE
 */
BOOLEAN
runDelayedLockRelatedOperations(J9VMThread *currentThread);

/**
 * @brief This function delays the identity operations during the Java checkpoint and restore hooks.
 *
 * @param currentThread thread token
 * @param instance the identity object
 * @param operation the operation specified for the instance
 *
 * @return BOOLEAN TRUE if no error, otherwise FALSE
 */
BOOLEAN
delayedLockingOperation(J9VMThread *currentThread, j9object_t instance, UDATA operation);

/**
 * This adds an internal CRIU restore hook to be invoked for each class iterated
 * via allClassesStartDo/allClassesNextDo.
 *
 * @param[in] currentThread vmThread token
 * @param[in] hookFunc The hook function to be invoked for the hook record
 *
 */
void
addInternalJVMClassIterationRestoreHook(J9VMThread *currentThread, classIterationRestoreHookFunc hookFunc);

jobject
getRestoreSystemProperites(J9VMThread *currentThread);

/**
 * @brief This function setup JNI fields and CRIU APIs before performing a checkpoint, only once.
 *
 * @param[in] env JNI environment
 * @param[in/out] currentExceptionClass current exception class
 * @param[in/out] systemReturnCode the system return code
 * @param[in/out] nlsMsgFormat an NLS message
 *
 * @return BOOLEAN TRUE if no error, otherwise FALSE
 */
BOOLEAN
setupJNIFieldIDsAndCRIUAPI(JNIEnv *env, jclass *currentExceptionClass, IDATA *systemReturnCode, const char **nlsMsgFormat);

/**
 * @brief This function performs a CRIU checkpoint using the options supplied.
 *
 * @param[in] env JNI environment
 * @param[in] imagesDir the directory that will hold the images upon checkpoint
 * @param[in] leaveRunning controls whether process trees are left running after checkpoint
 * @param[in] shellJob controls ability to dump shell jobs
 * @param[in] extUnixSupport controls whether to dump only one end of a unix socket pair
 * @param[in] logLevel the verbosity of log output
 * @param[in] logFile write log output to logFile
 * @param[in] fileLocks controls whether to dump file locks
 * @param[in] workDir the directory where non-image files are stored (e.g. logs)
 * @param[in] tcpEstablished controls whether to re-establish TCP connects
 * @param[in] autoDedup controls whether auto dedup of memory pages is enabled
 * @param[in] trackMemory controls whether memory tracking is enabled
 * @param[in] unprivileged controls whether CRIU will be invoked in privileged or unprivileged mode
 * @param[in] optionsFile the file that contains the new JVM options to be added on restore
 * @param[in] environmentFile the file that contains the new environment variables to be added
 * @param[in] ghostFileLimit the size limit for ghost files
 * @param[in] tcpClose controls whether to restore TCP sockets in closed state
 * @param[in] tcpSkipInFlight controls whether to skip in-flight TCP connections
 */
void JNICALL
criuCheckpointJVMImpl(JNIEnv *env, jstring imagesDir, jboolean leaveRunning, jboolean shellJob, jboolean extUnixSupport, jint logLevel, jstring logFile, jboolean fileLocks,
		jstring workDir, jboolean tcpEstablished, jboolean autoDedup, jboolean trackMemory, jboolean unprivileged, jstring optionsFile,
		jstring environmentFile, jlong ghostFileLimit, jboolean tcpClose, jboolean tcpSkipInFlight);
#endif /* defined(J9VM_OPT_CRIU_SUPPORT) */

/* ---------------- classloadersearch.c ---------------- */

/**
 * @brief	Append a single pathSegment to the bootstrap classloader
 * @param *vm
 * @param *pathSegment				a single path segment specifying the path to be added
 * @param enforceJarRestriction 	when true, fail if the pathSegment is not a jar file
 * @return error code
 */

UDATA
addToBootstrapClassLoaderSearch(J9JavaVM * vm, const char * pathSegment, UDATA classLoaderType, BOOLEAN enforceJarRestriction);

/**
 * @brief Append a single pathSegment to the system classloader
 * @param *vm
 * @param *pathSegment	a single path segment specifying the path to be added
 * @param enforceJarRestriction 	when true, fail if the pathSegment is not a jar file
 *
 * @return error code
 */

UDATA
addToSystemClassLoaderSearch(J9JavaVM * vm, const char* pathSegment, UDATA classLoaderType, BOOLEAN enforceJarRestriction);

/**
 * @brief Get a reference to jdk.internal.module.Modules.
 * @param *currentThread
 * @return class reference or null if error.
 */

jclass
getJimModules(J9VMThread *currentThread);
/* ---------------- description.c ---------------- */

/**
* @brief
* @param *ramClass
* @param *ramSuperClass
* @param *storage
*/
void
#if defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES)
calculateInstanceDescription( J9VMThread *vmThread, J9Class *ramClass, J9Class *ramSuperClass, UDATA *storage, J9ROMFieldOffsetWalkState *walkState, J9ROMFieldOffsetWalkResult *walkResult, BOOLEAN hasReferences);
#else /* J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES */
calculateInstanceDescription( J9VMThread *vmThread, J9Class *ramClass, J9Class *ramSuperClass, UDATA *storage, J9ROMFieldOffsetWalkState *walkState, J9ROMFieldOffsetWalkResult *walkResult);
#endif /* J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES */

#define NO_LOCKWORD_NEEDED (UDATA) -1
#define LOCKWORD_NEEDED		(UDATA) -2

/**
* @brief
* @param vm pointer to J9JavaVM that can be used by the method
* @param *romClass
* @param *ramSuperClass
* @return one of NO_LOCKWORD_NEEDED, LOCKWORD_NEEDED or the offset of the lockword already present in a superclass
*/
UDATA
checkLockwordNeeded( J9JavaVM *vm, J9ROMClass *romClass, J9Class *ramSuperClass, U_32 walkFlags );


/* ---------------- dllsup.c ---------------- */

/**
* @brief
* @param vm
* @param info
* @return UDATA
*/
UDATA loadJ9DLL(J9JavaVM * vm, J9VMDllLoadInfo* info);


/**
* @brief
* @param vm
* @param descriptor
* @param shutdownDueToExit
* @return IDATA
*/
IDATA shutdownDLL(J9JavaVM * vm, UDATA descriptor, UDATA shutdownDueToExit);

/**
 * Update the fatalErrorStr field of the supplied J9VMDllLoadInfo object,
 * freeing as necessary any allocated string owned by that object.
 *
 * @param portLib the port library
 * @param info the J9VMDllLoadInfo object
 * @param error the new string (may be NULL)
 * @param errorIsAllocated indicates whether error (if not NULL) must eventually be freed
 */
void setErrorJ9dll(J9PortLibrary *portLib, J9VMDllLoadInfo *info, const char *error, BOOLEAN errorIsAllocated);


/* ---------------- exceptiondescribe.c ---------------- */

/**
* @brief
* @param env
*/
void JNICALL
exceptionDescribe(JNIEnv * env);

void
internalExceptionDescribe(J9VMThread *vmThread);

/**
* @brief
* @param vmThread
* @param exception
* @param vmThread
* @param userData
* @param bytecodeOffset
* @param romClass
* @param romMethod
* @param fileName
* @param lineNumber
* @param classLoader
* @param ramClass)
* @param userData
* @param pruneConstructors
* @param skipHiddenFrames
* @return UDATA
*/
UDATA
iterateStackTrace(J9VMThread * vmThread, j9object_t* exception,  UDATA  (*callback) (J9VMThread * vmThread, void * userData, UDATA bytecodeOffset, J9ROMClass * romClass, J9ROMMethod * romMethod, J9UTF8 * fileName, UDATA lineNumber, J9ClassLoader* classLoader, J9Class* ramClass, UDATA frameType), void * userData, UDATA pruneConstructors, UDATA skipHiddenFrames);

/**
* @brief
* @param vmThread
* @param exception
* @param vmThread
* @param userData
* @param bytecodeOffset
* @param romClass
* @param romMethod
* @param fileName
* @param lineNumber
* @param classLoader
* @param ramClass)
* @param userData
* @param pruneConstructors
* @param skipHiddenFrames
* @param sizeOfWalkstateCache
* @param exceptionIsJavaObject
* @return UDATA
*/
UDATA
iterateStackTraceImpl(J9VMThread * vmThread, j9object_t* exception,  UDATA  (*callback) (J9VMThread * vmThread, void * userData, UDATA bytecodeOffset, J9ROMClass * romClass, J9ROMMethod * romMethod, J9UTF8 * fileName, UDATA lineNumber, J9ClassLoader* classLoader, J9Class* ramClass, UDATA frameType), void * userData, UDATA pruneConstructors, UDATA skipHiddenFrames, UDATA sizeOfWalkstateCache, BOOLEAN exceptionIsJavaObject);


/* ---------------- exceptionsupport.c ---------------- */



/**
* @brief
* @param *currentThread
* @param *walkState
* @return UDATA
*/
UDATA
exceptionHandlerSearch(J9VMThread *currentThread, J9StackWalkState *walkState);


/**
* @brief
* @param *currentThread
* @param *thrownExceptionClass
* @param *constantPool
* @param handlerIndex
* @param *walkState
* @return UDATA
*/
UDATA
isExceptionTypeCaughtByHandler(J9VMThread *currentThread, J9Class *thrownExceptionClass, J9ConstantPool *constantPool, UDATA handlerIndex, J9StackWalkState *walkState);




/**
* @brief
* @param *currentThread
* @param *method
*/
void
setNativeBindOutOfMemoryError(J9VMThread * currentThread, J9Method * method);


/**
* @brief
* @param *currentThread
* @param *method
*/
void
setRecursiveBindError(J9VMThread * currentThread, J9Method * method);


/**
* @brief
* @param *currentThread
* @param *method
*/
void
setNativeNotFoundError(J9VMThread * currentThread, J9Method * method);


/**
* @brief
* @param *currentThread
* @param *initiatingLoader
* @param *existingClass
*/
void
setClassLoadingConstraintError(J9VMThread * currentThread, J9ClassLoader * initiatingLoader, J9Class * existingClass);


/**
* @brief
* @param *currentThread
* @param instanceClass
* @param castClass
*/
void
setClassCastException(J9VMThread *currentThread, J9Class * instanceClass, J9Class * castClass);

/**
 * @brief
 * @param *currentThread
 * @param size
 */
void
setNegativeArraySizeException(J9VMThread *currentThread, I_32 size);

/**
* @brief
* @param *currentThread
* @param exceptionNumber
* @param *detailMessage
*/
void
setCurrentException(J9VMThread *currentThread, UDATA exceptionNumber, UDATA *detailMessage);


/**
* @brief
* @param *currentThread
* @param exceptionNumber
* @param *detailMessage
* @param cause
*/
void
setCurrentExceptionWithCause(J9VMThread *currentThread, UDATA exceptionNumber, UDATA *detailMessage, j9object_t cause);

/**
 * @brief Sets the exception using the message and cause
 *
 * @param currentThread current J9VMThread
 * @param exceptionNumber exception to be set
 * @param detailMessage j.l.String object describing the exception
 * @param utfMessage utf8 string describing the exception
 * @param cause cause of exception
 *
 */
void
setCurrentExceptionWithUtfCause(J9VMThread *currentThread, UDATA exceptionNumber, UDATA *detailMessage, const char *utfMessage, j9object_t cause);

/**
* @brief
* @param vmThread
* @param exceptionNumber
* @param moduleName
* @param messageNumber
*/
void
setCurrentExceptionNLS(J9VMThread * vmThread, UDATA exceptionNumber, U_32 moduleName, U_32 messageNumber);

/**
 * Prepare for throwing an exception. Find the exception class using its name.
 * Create an object using the exception class. Set an OutOfMemoryError if the
 * object cannot be created. Otherwise, set an exception pending using the
 * created object.
 *
 * Note this does not generate the "systhrow" dump event.
 *
 * @param vmThread[in] the current J9VMThread
 * @param exceptionClassName[in] the name of the exception class
 */
void
prepareExceptionUsingClassName(J9VMThread *vmThread, const char *exceptionClassName);

/**
 * @brief Creates exception with nls message; substitutes string values into error message.
 * @param vmThread current VM thread
 * @param nlsModule nls module name
 * @param nlsID nls number
 * @param exceptionIndex index to exception in vm constant pool
 * @param ... arguments to be substituted into error message
 */
void
setCurrentExceptionNLSWithArgs(J9VMThread * vmThread, U_32 nlsModule, U_32 nlsID, UDATA exceptionIndex, ...);

/**
* @brief
* @param currentThread
*/
void
setHeapOutOfMemoryError(J9VMThread * currentThread);


/**
* @brief
* @param currentThread
*/
void
setArrayIndexOutOfBoundsException(J9VMThread * currentThread, IDATA index);


/**
* @brief
* @param vmThread
* @param moduleName
* @param messageNumber
*/
void
setNativeOutOfMemoryError(J9VMThread * vmThread, U_32 moduleName, U_32 messageNumber);


/**
* @brief
* @param vmThread
* @param moduleName
* @param messageNumber
*/
void
setThreadForkOutOfMemoryError(J9VMThread * vmThread, U_32 moduleName, U_32 messageNumber);


/**
* @brief
* @param vmThread - current J9VMThread
* @param method - J9Method representing the conflict method.  (See Jazz 62438)
*/
void
setIncompatibleClassChangeErrorForDefaultConflict(J9VMThread * vmThread, J9Method *method);


/**
* @brief
* @param vmThread - current J9VMThread
* @param method - J9Method* representing the non-public method being invoked.
*/
void
setIllegalAccessErrorNonPublicInvokeInterface(J9VMThread *vmThread, J9Method *method);


/**
 * Error message helper for throwing IllegalAccessError when receiver class is not the same or subtype of current
 * [=interface] class in invokespecial
 *
 * @param vmStruct the current vmThread
 * @param receiverClass represents the receiver class
 * @param currentClass represents the current class
 */
void
setIllegalAccessErrorReceiverNotSameOrSubtypeOfCurrentClass(J9VMThread *vmStruct, J9Class *receiverClass, J9Class *currentClass);

/**
* @brief
* @param currentThread
* @return jint
*/
jint
initializeHeapOOMMessage(J9VMThread *currentThread);

/**
 * Error message helper for throwing IllegalAccessError when illegally accessing final fields.
 *
 * @param currentThread the current vmThread
 * @param isStatic TRUE for static, FALSE for instance
 * @param romClass J9ROMClass of the final field
 * @param field J9ROMFieldShape of the final field
 * @param romMethod J9ROMMethod of the accessing method
 */
void
setIllegalAccessErrorFinalFieldSet(J9VMThread *currentThread, UDATA isStatic, J9ROMClass *romClass, J9ROMFieldShape *field, J9ROMMethod *romMethod);

/**
* @brief
* @param vmThread
* @param exceptionNumber
* @param detailUTF
*/
void
setCurrentExceptionUTF(J9VMThread * vmThread, UDATA exceptionNumber, const char * detailUTF);


/**
* @brief
* @param currentThread
* @param exception
* @param walkOnly
* @return j9object_t (a java/lang/Throwable)
*/
j9object_t
walkStackForExceptionThrow(J9VMThread * currentThread, j9object_t exception, UDATA walkOnly);


struct J9Class;
void
setClassLoadingConstraintSignatureError(J9VMThread *currentThread, J9ClassLoader *loader1, J9Class *class1, J9ClassLoader *loader2, J9Class *class2, J9Class *exceptionClass, U_8 *methodName, UDATA methodNameLength, U_8 *signature, UDATA signatureLength);

void
setClassLoadingConstraintOverrideError(J9VMThread *currentThread, J9UTF8 *newClassNameUTF, J9ClassLoader *loader1, J9UTF8 *class1NameUTF, J9ClassLoader *loader2, J9UTF8 *class2NameUTF, J9UTF8 *exceptionClassNameUTF, U_8 *methodName, UDATA methodNameLength, U_8 *signature, UDATA signatureLength);

#if defined(J9VM_OPT_CRIU_SUPPORT)
/**
 * @brief Set JVMCRIUException to indicate that current operation is not allowed in CRIU single thread mode.
 * @param vmThread[in] the current J9VMThread
 * @param moduleName[in] the NLS module
 * @param messageNumber[in] the NLS message
 *
 */
void
setCRIUSingleThreadModeJVMCRIUException(J9VMThread *vmThread, U_32 moduleName, U_32 messageNumber);
#endif /* defined(J9VM_OPT_CRIU_SUPPORT) */

/* ---------------- extendedMessageNPE.cpp ---------------- */

/**
 * Return an extended NPE message.
 *
 * Note: the caller is responsible for freeing the returned string if it is not NULL.
 *
 * @param npeMsgData - the J9NPEMessageData structure holding romClass/romMethod/npePC
 * @return char* An extended NPE message or NULL if such a message can't be generated
 */
char*
getNPEMessage(J9NPEMessageData *npeMsgData);

/* ---------------- gphandle.c ---------------- */

struct J9PortLibrary;
/**
* @brief
* @param portLibrary
* @param gpType
* @param gpInfo
* @param userData J9JavaVM pointer.
* @return UDATA
*/
UDATA
structuredSignalHandlerVM(struct J9PortLibrary* portLibrary, U_32 gpType, void* gpInfo, void* userData);


struct J9PortLibrary;
/**
* @brief
* @param portLibrary
* @param gpType
* @param gpInfo
* @param userData J9VMThread pointer.
* @return UDATA
*/
UDATA
structuredSignalHandler(struct J9PortLibrary* portLibrary, U_32 gpType, void* gpInfo, void* userData);

/**
* @brief Called  on vmEntry and return from JNI to detect the case where we had percolated a condition and the user native illegally resumed execution
* 	Terminates the VM
* @param vmThread
*/
void
javaAndCStacksMustBeInSync(J9VMThread *vmThread, BOOLEAN fromJIT);

/* ---------------- growstack.c ---------------- */

#if (defined(J9VM_INTERP_GROWABLE_STACKS))  /* File Level Build Flags */

/**
* @brief
* @param vmThread
* @param bp
*/
void
freeStacks(J9VMThread * vmThread, UDATA * bp);


/**
* @brief
* @param vmThread
* @param newStackSize
* @return UDATA
*/
UDATA
growJavaStack(J9VMThread * vmThread, UDATA newStackSize);


#endif /* J9VM_INTERP_GROWABLE_STACKS */ /* End File Level Build Flags */


/* ---------------- initsendtarget.c ---------------- */

/**
* @brief
* @param *vmThread
* @param *method
*/
void
initializeMethodRunAddress(J9VMThread *vmThread, J9Method *method);

/**
* @brief
* @param vm
* @param *method
*/
void
initializeMethodRunAddressNoHook(J9JavaVM *vm, J9Method *method);

#if defined(J9VM_OPT_SNAPSHOTS)
/**
 * @brief This function is similar to initializeMethodRunAddress but without the hook call.
 *
 * Prior to writing a VM snapshot, J9Method::methodRunAddress and J9Method::extra need to be
 * reinitialized to a state that is restore friendly (i.e. set to appropriate interpreter entries).
 * initializeMethodRunAddress should not be used; it may run the J9HOOK_VM_INITIALIZE_SEND_TARGET
 * hook that initializes invocation counts and sets J9Method::methodRunAddress's to JIT specific
 * send targets. initializeMethodRunAddressNoHook should not be used because it does not perform
 * MethodHandle and VarHandle send target initialization, nor does it reset J9Method::extra
 * appropriately.
 *
 * @param vm pointer to the J9JavaVM
 * @param method pointer to the J9Method
 */
void
initializeMethodRunAddressForSnapshot(J9JavaVM *vm, J9Method *method);
#endif /* defined(J9VM_OPT_SNAPSHOTS) */

/**
* @brief
* @param vm
* @return jint
*/
jint
initializeINLInterception(J9JavaVM *vm);

/**
* @brief
* @param vm
*/
void
initializeInitialMethods(J9JavaVM *vm);

/* ---------------- jnicsup.c ---------------- */

/**
* @brief Determine if a JNI ref is an internal class ref
* @param *vm
* @param ref
* @return UDATA
*/
UDATA
jniIsInternalClassRef(J9JavaVM *vm, jobject ref);

/**
* @brief
* @param *currentThread
* @param *clazz
* @return void **
*/
void **
ensureJNIIDTable(J9VMThread *currentThread, J9Class* clazz);

/**
* @brief Find or create the corresponding J9JNIFIeldID for the rom field in declaringClass.
*
* This operation may fail if the JNIIDTable for the class cannot be created, there is
* insufficient memory in Classloader's pool of JNIIDs or if the declaringClass has been
* redefined since the J9ROMFieldShape was looked up as this will cause the fieldShape
* not to be present in the declaringClass->romClass
*
* @param *currentThread The current J9VMThread
* @param *declaringClass The J9Class that declares the field
* @param *field The J9ROMFieldShape describing the field.  Must be from the declaringClass->romClass.
* @param offset The offset (object or static) used to read the field
* @param inconsistentData An out parameter that is set to 1 if a redefinition mismatch is detected.  The caller must zero the field before calling.
* @return J9JNIFieldID *  NULL if the operation fails for any reason, including redefinition conflicts or a J9JNIFieldID if it succeeds
*/
J9JNIFieldID *
getJNIFieldID(J9VMThread *currentThread, J9Class* declaringClass, J9ROMFieldShape* field, UDATA offset, UDATA *inconsistentData);

/**
* @brief
* @param *currentThread
* @param *method
* @return J9JNIMethodID *
*/
J9JNIMethodID *
getJNIMethodID(J9VMThread *currentThread, J9Method *method);

/**
* @brief
* @param *currentThread
* @param *methodID
* @param *method
*/
void
initializeMethodID(J9VMThread * currentThread, J9JNIMethodID * methodID, J9Method * method);

/**
* @brief
* @param vmStruct
* @param slHandle
* @param fnName
* @param defaultResult
* @return jint
*/
jint
callJNILoad(J9VMThread* vmStruct, UDATA slHandle, char* fnName, jint defaultResult);


/**
* @brief
* @param *env
* @param *msg
*/
void JNICALL OMRNORETURN
fatalError(JNIEnv *env, const char *msg);


/**
* @brief
* @param *env
* @param receiver
* @param cls
* @param methodID
* @param args
*/
void
gpCheckCallin(JNIEnv *env, jobject receiver, jclass cls, jmethodID methodID, void* args);


/**
* @brief
* @param env
* @param clazz
*/
void JNICALL
gpCheckInitialize(J9VMThread* env, J9Class* clazz);


/**
* @brief
* @param env
* @param exceptionNumber
* @param detailMessage
*/
void JNICALL
gpCheckSetCurrentException(J9VMThread* env, UDATA exceptionNumber, UDATA* detailMessage);


/**
* @brief
* @param env
* @param exceptionNumber
* @param moduleName
* @param messageNumber
*/
void JNICALL
gpCheckSetCurrentExceptionNLS(J9VMThread* env, UDATA exceptionNumber, U_32 moduleName, U_32 messageNumber);


/**
* @brief
* @param env
* @param moduleName
* @param messageNumber
*/
void JNICALL
gpCheckSetNativeOutOfMemoryError(J9VMThread* env, U_32 moduleName, U_32 messageNumber);


/**
* @brief
* @param env
* @param size
*/
void JNICALL
gpCheckSetNegativeArraySizeException(J9VMThread* env, I_32 size);


/**
* @brief
* @param env
*/
void JNICALL
gpCheckSetHeapOutOfMemoryError(J9VMThread* env);


/**
* @brief
* @param *vm
*/
void
initializeJNITable(J9JavaVM *vm);


/**
* @brief
* @param *env
* @param *object
* @param isWeak
* @return jobject
*/
jobject JNICALL
j9jni_createGlobalRef(JNIEnv *env, j9object_t object, jboolean isWeak);


/**
* @brief
* @param *env
* @param *object
* @return jobject
*/
jobject JNICALL
j9jni_createLocalRef(JNIEnv *env, j9object_t object);


/**
* @brief
* @param *env
* @param globalRef
* @param isWeak
*/
void JNICALL
j9jni_deleteGlobalRef(JNIEnv *env, jobject globalRef, jboolean isWeak);


/**
* @brief
* @param *env
* @param localRef
*/
void JNICALL
j9jni_deleteLocalRef(JNIEnv *env, jobject localRef);


/**
* @brief
* @param vmThread
* @param type
*/
void
jniPopFrame(J9VMThread * vmThread, UDATA type);


/**
* @brief
* @param *vmThread
* @param method
* @param *args
* @return UDATA
*/
UDATA JNICALL
pushArguments(J9VMThread *vmThread, J9Method* method, void *args);


/* ---------------- jniinv.c ---------------- */

/**
* @brief
* @param vm
* @param p_env
* @param thr_args
* @return jint
*/
jint JNICALL
AttachCurrentThread(JavaVM * vm, void ** p_env, void * thr_args);


/**
* @brief
* @param vm
* @param p_env
* @param thr_args
* @return jint
*/
jint JNICALL
AttachCurrentThreadAsDaemon(JavaVM * vm, void ** p_env, void * thr_args);


/**
* @brief
* @param vm
* @param p_env
* @param threadName
* @return IDATA
*/
IDATA
attachSystemDaemonThread(J9JavaVM * vm, J9VMThread ** p_env, const char * threadName);


/**
* @brief
* @param javaVM
* @return jint
*/
jint JNICALL
DestroyJavaVM(JavaVM * javaVM);


/**
* @brief
* @param javaVM
* @return jint
*/
jint JNICALL
DetachCurrentThread(JavaVM * javaVM);


/**
* @brief
* @param *jvm
* @param **penv
* @param version
* @return jint
*/
jint JNICALL
GetEnv(JavaVM *jvm, void **penv, jint version);


#if (defined(J9VM_OPT_VM_LOCAL_STORAGE))
/**
* @brief
* @param vm
*/
void
initializeVMLocalStorage(J9JavaVM * vm);
#endif /* J9VM_OPT_VM_LOCAL_STORAGE */


/**
* @brief
* @param vm
* @param p_env
* @param thr_args
* @param threadType
* @param osThread
* @return IDATA
*/
IDATA
internalAttachCurrentThread(J9JavaVM * vm, J9VMThread ** p_env, J9JavaVMAttachArgs * thr_args, UDATA threadType, void * osThread);


#if (defined(J9VM_OPT_VM_LOCAL_STORAGE))
/**
* @brief
* @param env
* @param pInitCount
* @param ...
* @return UDATA
*/
UDATA JNICALL
J9VMLSAllocKeys(JNIEnv * env, UDATA * pInitCount, ...);
#endif /* J9VM_OPT_VM_LOCAL_STORAGE */


#if (defined(J9VM_OPT_VM_LOCAL_STORAGE))
/**
* @brief
* @param env
* @param pInitCount
* @param ...
*/
void JNICALL
J9VMLSFreeKeys(JNIEnv * env, UDATA * pInitCount, ...);
#endif /* J9VM_OPT_VM_LOCAL_STORAGE */


#if (defined(J9VM_OPT_VM_LOCAL_STORAGE))
/**
* @brief
* @param env
* @param key
* @return void *
*/
void * JNICALL
J9VMLSGet(JNIEnv * env, void * key);
#endif /* J9VM_OPT_VM_LOCAL_STORAGE */


#if (defined(J9VM_OPT_VM_LOCAL_STORAGE))
/**
* @brief
* @param env
* @param pKey
* @param value
* @return void *
*/
void * JNICALL
J9VMLSSet(JNIEnv * env, void ** pKey, void * value);
#endif /* J9VM_OPT_VM_LOCAL_STORAGE */


#if (defined(J9VM_OPT_SIDECAR))
/**
* @brief
* @param *vm
* @param *nHeaps
* @param *status
* @param statusSize
* @return jint
*/
jint JNICALL
QueryGCStatus(JavaVM *vm, jint *nHeaps, GCStatus *status, jint statusSize);
#endif /* J9VM_OPT_SIDECAR */


#if (defined(J9VM_OPT_SIDECAR))
/**
* @brief
* @param *vm
* @param nQueries
* @param *queries
* @return jint
*/
jint JNICALL
QueryJavaVM(JavaVM *vm,  jint nQueries, JavaVMQuery *queries);
#endif /* J9VM_OPT_SIDECAR */


#if (defined(J9VM_OPT_SIDECAR))
/**
* @brief
* @param *vm
* @return jint
*/
jint JNICALL
ResetJavaVM(JavaVM *vm);
#endif /* J9VM_OPT_SIDECAR */


/* ---------------- jnimem.c ---------------- */

#if (defined(J9VM_GC_JNI_ARRAY_CACHE))
/**
* @brief
* @param *vmThread
*/
void
cleanupVMThreadJniArrayCache(J9VMThread *vmThread);
#endif /* J9VM_GC_JNI_ARRAY_CACHE */


/**
* @brief
* @param vmThread
* @param sizeInBytes
* @return void*
*/
void*
jniArrayAllocateMemoryFromThread(J9VMThread* vmThread, UDATA sizeInBytes);


/**
* @brief
* @param vmThread
* @param location
*/
void
jniArrayFreeMemoryFromThread(J9VMThread* vmThread, void* location);

/* ---------------- jvmfree.c ---------------- */

#if (defined(J9VM_GC_DYNAMIC_CLASS_UNLOADING))
/**
* @brief
* @param *vmThread
* @param classLoader
*/
void
cleanUpClassLoader(J9VMThread *vmThread, J9ClassLoader* classLoader);
#endif /* J9VM_GC_DYNAMIC_CLASS_UNLOADING */

/**
* @brief
* @param vmThread
* @param decrementZombieCount
* @param sendThreadDestroyEvent
*/
void
deallocateVMThread(J9VMThread * vmThread, UDATA decrementZombieCount, UDATA sendThreadDestroyEvent);


/**
* @brief
* @param vmThread
* @param entries
* @param count
*/
void
freeClassLoaderEntries(J9VMThread * vmThread, J9ClassPathEntry **entries, UDATA count, UDATA initCount);

/**
* @brief
* @param vmThread
* @param entries
* @param count
*/
void
freeSharedCacheCLEntries(J9VMThread * vmThread, J9ClassLoader * classloader);

/**
 * Free resources held by J9Module and remove it from the pool.
 *
 * @param [in] vmThread pointer to J9VMThread
 * @param [in] j9module module to be freed
 *
 */
void
freeJ9Module(J9JavaVM *javaVM, J9Module *j9module);

/* ---------------- jvminit.c ---------------- */

#if defined(COUNT_BYTECODE_PAIRS)
/**
* @brief
* @param vm
*/
void
printBytecodePairs(J9JavaVM *vm);
#endif /* COUNT_BYTECODE_PAIRS */

/**
 * @brief Queries whether valueTypes are enable on the JVM
 * @param vm A handle to the J9JavaVM
 * @return TRUE if valueTypes are enabled, FALSE otherwise
 */
BOOLEAN
areValueTypesEnabled(J9JavaVM *vm);

/**
 * @brief Queries whether flattenable valueTypes are enable on the JVM
 * @param vm A handle to the J9JavaVM
 * @return TRUE if flattenable valueTypes are enabled, FALSE otherwise
 */
BOOLEAN
areFlattenableValueTypesEnabled(J9JavaVM *vm);

/**
 * Checks if args in specified args array have been consumed by the JVM, if not it outputs a warning message
 * and returns FALSE. This function consults the -XXvm:ignoreUnrecognized, -XX:[+|-]IgnoreUnrecognizedVMOptions
 * and -XX:[-|+]IgnoreUnrecognizedXXColonOptions to determine if args are consumed or not.
 *
 * @param vm vm token
 * @param portLibrary port lib token
 * @param j9vm_args the VM args array
 * @return TRUE if all args are consumed, FALSE otherwise
 */
UDATA
checkArgsConsumed(J9JavaVM * vm, J9PortLibrary* portLibrary, J9VMInitArgs* j9vm_args);

/**
 * @brief Queries if -XX:DiagnoseSyncOnValueBasedClasses=1 or -XX:DiagnoseSyncOnValueBasedClasses=2 are found in the CML
 * @param[in] vm pointer to the J9JavaVM
 * @return FALSE if neither of -XX:DiagnoseSyncOnValueBasedClasses=1/-XX:DiagnoseSyncOnValueBasedClasses=2 are found in the CML.
 * 			(i.e. neither J9_EXTENDED_RUNTIME2_VALUE_BASED_EXCEPTION/J9_EXTENDED_RUNTIME2_VALUE_BASED_WARNING are set in
 * 			vm->extendedRuntimeFlags2)
 * 			Otherwise, return TRUE.
 */
BOOLEAN areValueBasedMonitorChecksEnabled(J9JavaVM *vm);

/**
* @brief
* @param vmThread
* @param rc
*/
void OMRNORETURN
exitJavaVM(J9VMThread * vmThread, IDATA rc);

/**
* @brief
* @param j9vm_args
* @param match
* @param optionName
* @param optionValue
* @param doConsumeArgs
* @return IDATA
*/
IDATA
findArgInVMArgs(J9PortLibrary *portLibrary, J9VMInitArgs* j9vm_args, UDATA match, const char* optionName, const char* optionValue, UDATA doConsumeArgs);


/**
* @brief
* @param aPool
* @param dllName
* @return J9VMDllLoadInfo *
*/
J9VMDllLoadInfo *
findDllLoadInfo(J9Pool* aPool, const char* dllName);


/**
* @brief
* @param vm
*/
void
freeJavaVM(J9JavaVM * vm);

/**
* @brief
* @param osMainThread
* @param createParams Argument list, port library, etc.
* @return jint
*/
jint
initializeJavaVM(void * osMainThread, J9JavaVM ** vmPtr, J9CreateJavaVMParams *createParams);

/**
* @brief
* @param jniVersion
* @return UDATA
*/
UDATA
jniVersionIsValid(UDATA jniVersion);


/**
* @brief
* @param j9vm_args
* @param element
* @param action
* @param valuesBuffer
* @param bufSize
* @param delim
* @param separator
* @param reserved
* @return IDATA
*/
IDATA
optionValueOperations(J9PortLibrary *portLibrary, J9VMInitArgs* j9vm_args, IDATA element, IDATA action, char** valuesBuffer, UDATA bufSize, char delim, char separator, void* reserved);


/**
* @brief
* @param vm
* @param dllName
* @param argData
* @return IDATA
*/
IDATA
postInitLoadJ9DLL(J9JavaVM* vm, const char* dllName, void* argData);


#if (defined(J9VM_OPT_SIDECAR))
/**
* @brief
* @param vm
* @param sov_option
* @param j9_option
* @param mapFlags
* @return IDATA
*/
IDATA
registerCmdLineMapping(J9JavaVM* vm, char* sov_option, char* j9_option, UDATA mapFlags);
#endif /* J9VM_OPT_SIDECAR */


/**
* @brief
* @param vm
*/
void
runExitStages(J9JavaVM* vm, J9VMThread * vmThread);


/**
* @brief
* @param vm
* @param loadInfo
* @param options
* @return UDATA
*/
UDATA
runJVMOnLoad(J9JavaVM* vm, J9VMDllLoadInfo* loadInfo, char* options);


/**
* @brief
* @param vm
* @param stage
* @param reserved
* @return IDATA
*/
IDATA
threadInitStages(J9JavaVM* vm, IDATA stage, void* reserved);


/**
* @brief
* @param *vm
* @param stage
* @param reserved
* @return IDATA
*/
IDATA
VMInitStages(J9JavaVM *vm, IDATA stage, void* reserved);

/**
 * Initializes class path entries. Path of each class path entry is set using the 'classPath' provided as parameter.
 * Each path in 'classPath' is separated by 'classPathSeparator'.
 * If 'initClassPathEntry' is TRUE, then each class path entry in initialized by calling 'initializeClassPathEntry()' function.
 *
 * @param[in] vm pointer to the J9JavaVM
 * @param[in] classPath set of paths separated by 'classPathSeparator'
 * @param[in] classPathSeparator platform specific class path separator
 * @param[in] cpFlags clas path entry flags
 * @param[in] initClassPathEntry if TRUE initialize each class path entry
 * @param[out] classPathEntries returns the pointer array of class path entries.
 *
 * @return number of class path entries initialized
 */
UDATA
initializeClassPath(J9JavaVM *vm, char *classPath, U_8 classPathSeparator, U_16 cpFlags, BOOLEAN initClassPathEntry, J9ClassPathEntry ***classPathEntries);

/*
 * Initialize the given class path entry. This involves determining what kind
 * of entry it is, and preparing to do class loads (without actually doing any).
 *
 * @param[in] javaVM pointer to the J9JavaVM
 * @param[in] cpEntry pointer to J9ClassPathEntry to be initialized
 *
 * @return IDATA type of the entry which is one of the following
 * 		CPE_TYPE_DIRECTORY if it's a directory
 * 		CPE_TYPE_JAR if it's a ZIP file, extraInfo contains the J9ZipFile
 * 		CPE_TYPE_JIMAGE if it's a jimage file
 * 		CPE_TYPE_USUSABLE if it's a bad entry, don't try to use it anymore
 */
IDATA
initializeClassPathEntry (J9JavaVM * javaVM, J9ClassPathEntry *cpEntry);

/**
 * Searches system properties for jdk.launcher.patch.<n> property that specifies
 * the patch path for the given moduleName.
 * It should only be called for modules loaded by bootloader.
 * moduleName should never be NULL.
 *
 * @param[in] javaVM		pointer to the J9JavaVM
 * @param[in] j9module		pointer to J9Module for which patch path is to be set
 * @param[in] moduleName	name of the module
 * @return TRUE on success, FALSE if an internal error occurs
 */
BOOLEAN
setBootLoaderModulePatchPaths(J9JavaVM * javaVM, J9Module * j9module, const char * moduleName);

/**
 * @brief Register jvminit.c::predefinedHandlerWrapper using j9sig_set_*async_signal_handler
 * for the specified signal
 *
 * @param[in] vm pointer to a J9JavaVM
 * @param[in] signal integer value of the signal
 * @param[out] oldOSHandler points to the old signal handler function
 *
 * @return 0 on success and non-zero on failure
 */
IDATA
registerPredefinedHandler(J9JavaVM *vm, U_32 signal, void **oldOSHandler);

/**
 * @brief Register a signal handler function with the OS for the specified signal.
 *
 * @param[in] vm pointer to a J9JavaVM
 * @param[in] signal integer value of the signal
 * @param[in] newOSHandler address to the new signal handler function which will be registered
 * @param[out] oldOSHandler points to the old signal handler function
 *
 * @return 0 on success and non-zero on failure
 */
IDATA
registerOSHandler(J9JavaVM *vm, U_32 signal, void *newOSHandler, void **oldOSHandler);

#if defined(J9VM_OPT_JITSERVER)
/**
 * @brief checks if the runtime flag for enabling JITServer is set or not
 *
 * @param[in] vm pointer to a J9JavaVM
 *
 * @return TRUE if the flag for JITServer is set, FALSE otherwise
 */
BOOLEAN
isJITServerEnabled(J9JavaVM *vm);

#endif /* J9VM_OPT_JITSERVER */

/* ---------------- romutil.c ---------------- */

/**
* @brief
* @param *romClass
* @param *vmThread
* @return J9ROMClass*
*/
J9ROMClass*
checkRomClassForError( J9ROMClass *romClass, J9VMThread *vmThread );

struct J9ClassLoader;
/**
* @brief
* @param *vmStruct
* @param *clsName
* @param clsNameLength
* @param *romClassBytes
* @param romClassLength
* @return J9ROMClass *
*/
J9ROMClass *
romClassLoadFromCookie (J9VMThread *vmStruct, U_8 *clsName, UDATA clsNameLength, U_8 *romClassBytes, UDATA romClassLength);


/**
* @brief
* @param *romClass
* @param *vmThread
*/
void
setExceptionForErroredRomClass( J9ROMClass *romClass, J9VMThread *vmThread );


/* ---------------- KeyHashTable.c ---------------- */

/* Flag(s) used by hashClassTableStartDo()/hashClassTableNextDo() and set to J9HashTableState.flags
 * to control whether to skip special classes, like hidden classes, in the hash table iteration.
 */
#define J9_HASH_TABLE_STATE_FLAG_SKIP_HIDDEN 1

/**
* Searches classLoader for any loaded classes in a specific package
*
* @param classLoader loader to be searched
* @param pkgName package name
* @param pkgNameLength package name length
* @return TRUE if class has been loaded in package, FALSE otherwise
*/
BOOLEAN
isAnyClassLoadedFromPackage(J9ClassLoader* classLoader, U_8 *pkgName, UDATA pkgNameLength);

/**
* @brief
* @param *classLoader
*/
void
hashClassTableFree(J9ClassLoader* classLoader);


/**
* @brief
* @param *classLoader
* @param *className
* @param classNameLength
* @param flags
* @return J9Class *
*/
J9Class *
hashClassTableAt(J9ClassLoader *classLoader, U_8 *className, UDATA classNameLength, UDATA flags);


/**
* @brief
* @param *classLoader
* @param stringObject
* @param flags
* @return J9Class *
*/
J9Class *
hashClassTableAtString(J9ClassLoader *classLoader, j9object_t stringObject, UDATA flags);


/**
* @brief
* @param *classLoader
* @param *className
* @param classNameLength
* @param *value
* @return UDATA
*/
UDATA
hashClassTableAtPut(J9VMThread *vmThread, J9ClassLoader *classLoader, U_8 *className, UDATA classNameLength, J9Class *value);


/**
* @brief
* @param *table
* @param *className
* @param classNameLength
* @return UDATA
*/
UDATA
hashClassTableDelete(J9ClassLoader *classLoader, U_8 *className, UDATA classNameLength);

/**
* @brief Remove package entry from hashClassTable
* @param *classLoader
* @param *romClass of package to be removed
* @return UDATA 0 on success, 1 on failure
*/
UDATA
hashClassTablePackageDelete(J9VMThread *vmThread, J9ClassLoader* classLoader, J9ROMClass* romClass);

/**
* @brief
* @param *javaVM
* @param initialSize
* @return J9HashTable *
*/
J9HashTable *
hashClassTableNew(J9JavaVM *javaVM, U_32 initialSize);


/**
* @brief
* @param vmThread
* @param *classLoader
* @param *originalClass
* @param *replacementClass
*/
void
hashClassTableReplace(J9VMThread* vmThread, J9ClassLoader *classLoader, J9Class *originalClass, J9Class *replacementClass);

/**
* @brief Iterate over the classes defined by or cached in the specified class loader
* @param *classLoader The class loader to use.
* @param *walkState The J9HashTableState.
* @param flags Flags to control whether to skip special classes, like hidden classes, in the iteration.
* @return J9Class*
*/
J9Class*
hashClassTableStartDo(J9ClassLoader *classLoader, J9HashTableState* walkState, UDATA flags);

/**
* @brief Iterate over the classes defined by or cached in the specified class loader
* @param *walkState
* @return J9Class*
*/
J9Class*
hashClassTableNextDo(J9HashTableState* walkState);

/**
 * @brief Create the hash table to map J9Class to J9ClassLocation
 * @param initialSize initial size
 * @return Pointer to new hash table
 */
J9HashTable *
hashClassLocationTableNew(J9JavaVM *javaVM, U_32 initialSize);

/**
 * @brief Locates and returns a structure containing load location for the given class
 * Caller must acquire classLoaderModuleAndLocationMutex before making the call
 *
 * @param currentThread current thread pointer
 * @param clazz J9Class for which load location is to be searched
 *
 * @return pointer to J9ClassLocation for the given class, or NULL if not found
 */
J9ClassLocation *
findClassLocationForClass(J9VMThread *currentThread, J9Class *clazz);

/**
 * @brief Add outlivingLoader to the set of loaders known to outlive classLoader.
 *
 * The addition could fail due to OOM, but such failures are ignored because the
 * set of outliving loaders is not required to be complete.
 *
 * If outlivingLoader is permanent, then it is ignored because the few permanent
 * loaders trivially outlive all loaders.
 *
 * If classLoader is permanent, then outlivingLoader must also be permanent, so
 * mark it as such.
 *
 * The caller must hold the classTableMutex.
 *
 * @param currentThread the J9VMThread of the current thread
 * @param classLoader the initiating class loader
 * @param outlivingLoader the loader that will outlive classLoader
 *
 * @see markLoaderPermanent(J9VMThread *currentThread, J9ClassLoader *classLoader)
 */
void
addOutlivingLoader(J9VMThread *currentThread, J9ClassLoader *classLoader, J9ClassLoader *outlivingLoader);

/**
 * @brief Take note that classLoader is permanent.
 *
 * Any loader already known to outlive classLoader is also permanent, and will
 * be marked as such, transitively.
 *
 * The caller must hold the classTableMutex.
 *
 * @param currentThread the J9VMThread of the current thread
 * @param classLoader the permanent class loader
 */
void
markLoaderPermanent(J9VMThread *currentThread, J9ClassLoader *classLoader);

/* ---------------- ModularityHashTables.c ---------------- */

/**
 * Used by classLoader->moduleHashTable which doesn't allow multiple modules with same module name.
 * Create a new J9HashTable with hashFn (moduleNameHashFn) and hashEqualFn (moduleNameHashEqualFn).
 * Using module name as the key can determine if two modules are same based on their module names.
 *
 * @param javaVM A java VM
 * @param initialSize initial size
 * @return an initialized J9HashTable on success, otherwise NULL.
 */
J9HashTable *
hashModuleNameTableNew(J9JavaVM *javaVM, U_32 initialSize);

/**
 * Used by J9Package->exportsHashTable, J9Module->readAccessHashTable, and J9Module->removeAccessHashTable
 * which might contain modules loaded by different classloader but with same module names.
 * Create a new J9HashTable with hashFn (modulePointerHashFn) and hashEqualFn (modulePointerHashEqualFn).
 * Using J9Module pointer as the key can differentiate modules loaded by different classloader with same module name.
 * @param javaVM A java VM
 * @param initialSize initial size
 * @return an initialized J9HashTable on success, otherwise NULL.
 */
J9HashTable *
hashModulePointerTableNew(J9JavaVM *javaVM, U_32 initialSize);

/**
 * @brief Create the package definition hash table
 * @param initialSize initial size
 * @return Pointer to new hash table
 */
J9HashTable *
hashPackageTableNew(J9JavaVM *javaVM, U_32 initialSize);

/**
 * @brief Create the hash table to map J9Module to J9ModuleExtraInfo
 * @param initialSize initial size
 * @return Pointer to new hash table
 */
J9HashTable *
hashModuleExtraInfoTableNew(J9JavaVM *javaVM, U_32 initialSize);

/**
 * @brief Returns pointer to J9Module that is associated with the given package name
 * @param currentThread current thread pointer
 * @param classLoader the search will be limited to this class loader
 * @param packageName pointer to J9UTF8 containing the package name
 * @return Returns pointer to J9Module that is associated with the given package name or NULL if not found.
 */
J9Module *
findModuleForPackageUTF8(J9VMThread *currentThread, J9ClassLoader *classLoader, J9UTF8 *packageName);

/**
 * @brief Returns pointer to J9Module that is associated with the given package name
 * @param currentThread current thread pointer
 * @param classLoader the search will be limited to this class loader
 * @param packageName the package name
 * @param packageNameLen length of the package name
 * @return Returns pointer to J9Module that is associated with the given package name or NULL if not found.
 */
J9Module *
findModuleForPackage(J9VMThread *currentThread, J9ClassLoader *classLoader, U_8 *packageName, U_32 packageNameLen);

/**
 * @brief Locates and returns a structure containing extra information like jrt URL, patch path entries associated with the given module
 *
 * @param currentThread current thread pointer
 * @param classLoader the search will be limited to this class loader's table
 * @param j9module module for which J9ModuleExtraInfo is required
 *
 * @return pointer to J9ModuleExtraInfo for the given module, or NULL if not found
 */
J9ModuleExtraInfo *
findModuleInfoForModule(J9VMThread *currentThread, J9ClassLoader *classLoader, J9Module *j9module);

/* ---------------- lookupmethod.c ---------------- */

/**
 * @brief Search method in target class
 *
 * @param clazz The class or interface to start the search
 * @param name The name of the method
 * @param nameLength The length of the method name
 * @param sig The signature of the method
 * @param sigLength The length of the method signature
 *
 * @returns the method (if found) or NULL otherwise
 */
J9Method*
searchClassForMethod(J9Class *clazz, U_8 *name, UDATA nameLength, U_8 *sig, UDATA sigLength) ;

/**
 * Redirects to javaLookupMethodImpl with foundDefaultConflicts = NULL.
 *
 * @brief
 * @param currentThread
 * @param method
 * @return J9Method*
 */
UDATA
javaLookupMethod (J9VMThread *vmContext, J9Class *clazz, J9ROMNameAndSignature *selector, J9Class *senderClass, UDATA options);

/**
 * Temporary impl of javaLookupMethod for adding BOOLEAN foundDefConflicts. Will be removed as part of work item 67075.
 */
UDATA
javaLookupMethodImpl (J9VMThread *vmContext, J9Class *clazz, J9ROMNameAndSignature *selector, J9Class *senderClass, UDATA options, BOOLEAN *foundDefaultConflicts);

/* ---------------- lookuphelper.c ---------------- */

/**
* @brief Disable hooks which must have been hooked by now if isDebugOnRestoreEnabled() returns false,
*        otherwise, check if the events are hooked or reserved instead.
* @param[in] vm pointer to the J9JavaVM
* @return TRUE if EnterStep or Breakpoint must be reported, otherwise FALSE.
*/
UDATA
mustReportEnterStepOrBreakpoint(J9JavaVM *vm);


/* ---------------- monhelpers.c ---------------- */

/**
* @brief
* @param vmStruct
* @param object
* @return IDATA
*/
UDATA
objectMonitorEnter(J9VMThread* vmStruct, j9object_t object);


/**
* @brief
* @param vmStruct
* @param object
* @return IDATA
*/
IDATA
objectMonitorExit(J9VMThread* vmStruct, j9object_t object);


/**
* @brief
* @param vmStruct
* @param object
* @param lock
* @return omrthread_monitor_t
*/
J9ObjectMonitor *
objectMonitorInflate(J9VMThread* vmStruct, j9object_t object, UDATA lock);

/**
* @brief
* @param *vm
* @param vmThread
* @param monitor
* @return IDATA
*/
IDATA
objectMonitorDestroy(J9JavaVM *vm, J9VMThread *vmThread, omrthread_monitor_t monitor);

/**
* @brief
* @param vm
* @param vmThread
*/
void
objectMonitorDestroyComplete(J9JavaVM *vm, J9VMThread *vmThread);

#if defined(J9VM_THR_LOCK_RESERVATION)
/**
 * Cancel the lock reservation for the object stored in the current thread's
 * blockingEnterObject field.
 *
 * The current thread must have VM access.
 * The current thread must not own the inflated (bimodal) monitor for the object.
 *
 * This function may release and reacquire VM access.
 *
 * On return the object's lock word is unreserved but not assigned to the current thread. The thread
 * must still acquire the lock using the normal process. It is also possible that the lock has been reserved
 * again by the time the caller sees it.
 */
void
cancelLockReservation(J9VMThread* vmStruct);

#endif /* J9VM_THR_LOCK_RESERVATION */

/* ---------------- montable.c ---------------- */

/**
* @brief
* @param vm
*/
void
destroyMonitorTable(J9JavaVM* vm);


/**
* @brief
* @param vm
* @return UDATA
*/
UDATA
initializeMonitorTable(J9JavaVM* vm);


/**
* @brief
* @param vmStruct
* @param object
* @return omrthread_monitor_t
*/
J9ObjectMonitor *
monitorTableAt(J9VMThread* vmStruct, j9object_t object);


/**
* @brief used to cache an J9ObjectMonitor in the vmthread structure so that
*        we don't have to go to the monitor table to get it
* @param vm  J9JavaVM that can be used by the method
* @param vmStruct the vmThread for which the object monitor should be cached
* @param objectMonitor the J9ObjectMonitor to be cached on the thread
*/
void
cacheObjectMonitorForLookup(J9JavaVM* vm, J9VMThread* vmStruct, J9ObjectMonitor* objectMonitor);

/* ---------------- thrinfo.c ---------------- */

/**
 * @brief Search the monitor tables in vm->monitorTable for the inflated monitor corresponding to an
 * object. Similar to monitorTableAt(), but doesn't add the monitor if it isn't found in the hashtable.
 *
 * This function may block on vm->monitorTableMutex.
 * This function can work out-of-process.
 *
 * @param[in] vm the JavaVM. For out-of-process: may be a local or target pointer.
 * vm->monitorTable must be a target value.
 * @param[in] object the object. For out-of-process: a target pointer.
 *
 * @return a J9ObjectMonitor from the monitor hashtable or a NULL if there is no corresponding monitor
 * in vm->monitorTable.
 *
 * @see monitorTablePeekMonitor in util_internal.h
 */
J9ObjectMonitor *
monitorTablePeek(J9JavaVM *vm, j9object_t object);

/* ---------------- PackageIDHashTable.c ---------------- */

/**
* @brief Find the package ID for the given name and length
* @note Must own the classTableMutex.
* @param *vmThread J9VMThread instance
* @param *classLoader Classloader for the class
* @param *romClass ROM class with the package name
* @param entryIndex classpath index
* @param locationType location type of class
* @return UDATA Package ID
*/
UDATA
hashPkgTableIDFor(J9VMThread *vmThread, J9ClassLoader *classLoader, J9ROMClass* romClass, IDATA entryIndex, I_32 locationType);

/**
* @brief Look up the package information given a ROM class.
* @note Must own the classTableMutex.
* @note The ROM class may be a dummy with only the package name.
* @param *classLoader Classloader for the class
* @param *romClass ROM class with the package name
* @return J9PackageIDTableEntry* ROM class representing a package
*/
J9PackageIDTableEntry *
hashPkgTableAt(J9ClassLoader* classLoader, J9ROMClass* romClass);

/**
* @brief Iterate over the package IDs used by the specified class loader
* @param *classLoader
* @param *walkState
* @return J9PackageIDTableEntry*
*/
J9PackageIDTableEntry*
hashPkgTableStartDo(J9ClassLoader *classLoader, J9HashTableState* walkState);

/**
* @brief Iterate over the package IDs used by the specified class loader
* @param *walkState
* @return J9PackageIDTableEntry*
*/
J9PackageIDTableEntry*
hashPkgTableNextDo(J9HashTableState* walkState);

/* ---------------- profilingbc.c ---------------- */

#if (defined(J9VM_INTERP_PROFILING_BYTECODES))
/**
* @brief
* @param vmThread
*/
void
flushBytecodeProfilingData(J9VMThread* vmThread);
#endif /* J9VM_INTERP_PROFILING_BYTECODES */


#if (defined(J9VM_INTERP_PROFILING_BYTECODES))
/**
* @brief
* @param vm
*/
void
profilingBytecodeBufferFullHookRegistered(J9JavaVM* vm);

#endif /* J9VM_INTERP_PROFILING_BYTECODES */


/* ---------------- rasdump.c ---------------- */

/**
* @brief
* @param *vm
* @return IDATA
*/
IDATA
configureRasDump(J9JavaVM *vm);


struct J9JavaVM;
struct J9VMThread;
/**
* @brief
* @param *vm
* @param *currentThread
* @return IDATA
*/
IDATA
gpThreadDump(struct J9JavaVM *vm, struct J9VMThread *currentThread);


/* ---------------- rastrace.c ---------------- */

/**
* @brief
* @param *vm
* @param *j9vm_args
* @return IDATA
*/
IDATA
configureRasTrace(J9JavaVM *vm, J9VMInitArgs *j9vm_args);

/* ---------------- resolvefield.c ---------------- */

/**
* @brief
* @param vm
* @return UDATA
*/
UDATA
initializeHiddenInstanceFieldsList(J9JavaVM *vm);

/**
* @brief
* @param vm
*/
void
freeHiddenInstanceFieldsList(J9JavaVM *vm);

/**
 * @brief Add an extra hidden instance field to the specified class when it is loaded.
 * @param vm[in] pointer to the J9JavaVM
 * @param className[in] the fully qualified name of the class to be modified
 * @param fieldName[in] the name of the hidden field to be added (used for information purposes only - no checks for duplicate names will be made)
 * @param fieldSignature[in] the Java signature for the field (e.g. "J" (long), "I" (int), "Ljava/lang/String;", etc)
 * @param offsetReturn[out] the address to store the offset of the field once the class is loaded; may be NULL if not needed
 * @return 0 on success, non-zero if the field could not be recorded or some other error occurred
 */
UDATA
addHiddenInstanceField(J9JavaVM *vm, const char *className, const char *fieldName, const char *fieldSignature, UDATA *offsetReturn);

/**
 * Report a hot field if the JIT has determined that the field has met appropriate thresholds to be determined a hot field.
 * Valid if dynamicBreadthFirstScanOrdering is enabled.
 *
 * @param vm[in] pointer to the J9JavaVM
 * @param reducedCpuUtil normalized cpu utilization of the hot field for the method being compiled
 * @param clazz pointer to the class where a hot field should be added
 * @param fieldOffset value of the field offset that should be added as a hot field for the given class
 * @param reducedFrequency normalized block frequency of the hot field for the method being compiled
 */
void
reportHotField(J9JavaVM *javaVM, int32_t reducedCpuUtil, J9Class* clazz, uint8_t fieldOffset,  uint32_t reducedFrequency);

/**
* @brief
* @param *vmStruct
* @param *clazz
* @param *fieldName
* @param fieldNameLength
* @param *signature
* @param signatureLength
* @param **definingClass
* @param *instanceField
* @param options
* @return IDATA
*/
IDATA
instanceFieldOffset(J9VMThread *vmStruct, J9Class *clazz, U_8 *fieldName, UDATA fieldNameLength, U_8 *signature, UDATA signatureLength, J9Class **definingClass, UDATA *instanceField, UDATA options);


/**
* @brief
* @param *vmStruct
* @param *clazz
* @param *fieldName
* @param fieldNameLength
* @param *signature
* @param signatureLength
* @param **definingClass
* @param *instanceField
* @param options
* @param *sourceClass
* @return IDATA
*/
IDATA
instanceFieldOffsetWithSourceClass(J9VMThread *vmStruct, J9Class *clazz, U_8 *fieldName, UDATA fieldNameLength, U_8 *signature, UDATA signatureLength, J9Class **definingClass, UDATA *instanceField, UDATA options, J9Class *sourceClass);

/**
* @brief Iterate over fields of the specified class in JVMTI order.
* @param vm[in]					pointer to the J9JavaVM
* @param romClass[in]			the ROM class whose fields will be iterated
* @param superClazz[in]			the RAM super class of the class whose fields will be iterated
* @param state[in/out]			the walk state that can subsequently be passed to fieldOffsetsNextDo()
* @param flags[in]				J9VM_FIELD_OFFSET_WALK_* flags
* @param flattenedClassCache[in]	A table of all flattened instance field types
* @return J9ROMFieldOffsetWalkResult *
*/
J9ROMFieldOffsetWalkResult *
#if defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES)
fieldOffsetsStartDo(J9JavaVM *vm, J9ROMClass *romClass, J9Class *superClazz, J9ROMFieldOffsetWalkState *state, U_32 flags, J9FlattenedClassCache *flattenedClassCache);
#else /* J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES */
fieldOffsetsStartDo(J9JavaVM *vm, J9ROMClass *romClass, J9Class *superClazz, J9ROMFieldOffsetWalkState *state, U_32 flags);
#endif /* J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES */

/**
 * Initialize fields offsets into FCC
 *
 * @param[in] *currentThread the current thread
 * @param[in] *clazz class
 *
 * @returns void
 */
void
calculateFlattenedFieldAddresses(J9VMThread *currentThread, J9Class *clazz);

/**
 * Initialize fields to default values when the class
 * contains unflattened flattenables.
 *
 * @param[in] *currentThread the current thread
 * @param[in] *clazz the resolved class
 * @param[in] instance J9Object with unflattened flattenable fields
 *
 * @returns void
 */
void
defaultValueWithUnflattenedFlattenables(J9VMThread *currentThread, J9Class *clazz, j9object_t instance);

/**
 * Initialize static fields to default values when the class
 * contains flattenable statics. Currently none of the static fields are flattened.
 *
 * @param[in] currentThread the current thread
 * @param[in] clazz the class being loaded
 * @param[in] entry The FCC entry for the static field
 * @param[in] entryClazz the clazz in the FCC entry for the static field
 *
 * @returns void
 */
void
classPrepareWithWithUnflattenedFlattenables(J9VMThread *currentThread, J9Class *clazz, J9FlattenedClassCacheEntry *entry, J9Class *entryClazz);

/**
 * Compare two objects for equality. This helper will perform a
 * structural comparison if both objecst are valueTypes
 *
 * @param[in] currentThread the current thread
 * @param[in] lhs first operand
 * @param[in] rhs second operand
 *
 * @return TRUE if both objects are equal, false otherwise
 */
BOOLEAN
valueTypeCapableAcmp(J9VMThread *currentThread, j9object_t lhs, j9object_t rhs);

/**
 * Determines if null-restricted attribute is set on a field or not.
 *
 * @param[in] field The field to be checked
 *
 * @return TRUE if the field has null-restricted attribute set, FALSE otherwise
 */
BOOLEAN
isFieldNullRestricted(J9ROMFieldShape *field);

/**
 * Performs an aaload operation on an object. Handles flattened and non-flattened cases.
 *
 * Assumes recieverObject is not null.
 * All AIOB exceptions must be thrown before calling.
 *
 * Returns null if newObjectRef retrieval fails.
 *
 * If fast == false, special stack frame must be built and receiverObject must be pushed onto it.
 *
 * @param[in] currentThread thread token
 * @param[in] receiverObject arrayObject
 * @param[in] index array index
 * @param[in] fast bool for fast or slow path
 *
 * @return array element
 */
j9object_t
loadFlattenableArrayElement(J9VMThread *currentThread, j9object_t receiverObject, U_32 index, BOOLEAN fast);

/**
 * Performs an aastore operation on an object. Handles flattened and non-flattened cases.
 *
 * Assumes recieverObject and paramObject are not null.
 * All AIOB exceptions must be thrown before calling.
 *
 * @param[in] currentThread thread token
 * @param[in] receiverObject arrayObject
 * @param[in] index array index
 * @param[in] paramObject obj arg
 */
void
storeFlattenableArrayElement(J9VMThread *currentThread, j9object_t receiverObject, U_32 index, j9object_t paramObject);

/**
* @brief Iterate over fields of the specified class in JVMTI order.
* @param state[in/out]  the walk state that was initialized via fieldOffsetsStartDo()
* @return J9ROMFieldOffsetWalkResult *
*/
J9ROMFieldOffsetWalkResult *
fieldOffsetsNextDo(J9ROMFieldOffsetWalkState *state);

/**
* @brief Fully traverse the fields of the specified class and its superclasses.
* @param vm[in]			pointer to the J9JavaVM
* @param clazz[in]		the RAM class whose fields will be iterated
* @param state[in/out]  the walk state that can subsequently be passed to fullTraversalFieldOffsetsNextDo()
* @param flags[in]		J9VM_FIELD_OFFSET_WALK_* flags
* @return J9ROMFieldShape *
*/
J9ROMFieldShape *
fullTraversalFieldOffsetsStartDo(J9JavaVM *vm, J9Class *clazz, J9ROMFullTraversalFieldOffsetWalkState *state, U_32 flags);

/**
* @brief Fully traverse the fields of the specified class and its superclasses.
* @param state[in/out]  the walk state that was initialized via fullTraversalFieldOffsetsStartDo()
* @return J9ROMFieldShape *
*/
J9ROMFieldShape *
fullTraversalFieldOffsetsNextDo(J9ROMFullTraversalFieldOffsetWalkState *state);

#if defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES)
/**
 * @brief Search for ramClass in flattened class cache
 *
 * @param flattenedClassCache[in]	A table of flattened instance field types
 * @param className[in]				Name of class to search
 * @param classNameLength[in]		Length of class name to search
 *
 * @return J9Class if found NULL otherwise
 */
J9Class *
findJ9ClassInFlattenedClassCache(J9FlattenedClassCache *flattenedClassCache, U_8 *className, UDATA classNameLength);

/**
 * @brief Search for index of field in flattened class cache
 *
 * @param flattenedClassCache[in]	A table of flattened instance field types
 * @param nameAndSignature[in]		The name and signature of field to look for
 *
 * @return index if found, UDATA_MAX otherwise
 */
UDATA
findIndexInFlattenedClassCache(J9FlattenedClassCache *flattenedClassCache, J9ROMNameAndSignature *nameAndSignature);
#endif /* J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES */

/**
 * Returns the offset of a flattenable field.
 *
 * @param[in] fieldOwner the J9class that defines the field
 * @param[in] field romfieldshape of the field
 *
 * @return field offset
 */
UDATA
getFlattenableFieldOffset(J9Class *fieldOwner, J9ROMFieldShape *field);

/**
 * Returns if a field is flattened.
 * This helper assumes field is null-restricted.
 *
 * @param[in] fieldOwner the J9class that defines the field
 * @param[in] field romfieldshape of the field
 *
 * @return TRUE if field is flattened, false otherwise
 */
BOOLEAN
isFlattenableFieldFlattened(J9Class *fieldOwner, J9ROMFieldShape *field);

/**
 * Returns the type of an instance field.
 * This helper assumes field is null-restricted.
 *
 * @param[in] fieldOwner the J9class that defines the field
 * @param[in] field romfieldshape of the field
 *
 * @return TRUE if field is flattened, false otherwise
 */
J9Class *
getFlattenableFieldType(J9Class *fieldOwner, J9ROMFieldShape *field);

/**
 * Returns the size of an instance field. `J9_VALUETYPE_FLATTENED_SIZE` will be deprecated.
 * This helper assumes field is null-restricted.
 *
 * @param[in] currentThread thread token
 * @param[in] fieldOwner the J9class that defines the field
 * @param[in] fieldref cp ref of the field
 *
 * @return TRUE if field is flattened, false otherwise
 */
UDATA
getFlattenableFieldSize(J9VMThread *currentThread, J9Class *fieldOwner, J9ROMFieldShape *field);

/**
 * Returns the size of an array element field. `J9_VALUETYPE_FLATTENED_SIZE`
 * will be deprecated.
 *
 * @param[in] arrayClass containing elements
 *
 * @return size of the array element
 */
UDATA
arrayElementSize(J9ArrayClass* arrayClass);

/**
 * Performs a getfield operation on an object. Handles flattened and non-flattened cases.
 * This helper assumes that the cpIndex points to a resolved null-restricted fieldRef. This helper
 * also assumes that the cpIndex points to an instance field.
 *
 * @param currentThread thread token
 * @param cpEntry the RAM cpEntry for the field, needs to be resolved
 * @param receiver receiver object
 * @param fastPath performs fastpath allocation, no GC. If this is false
 * 			frame must be built before calling as GC may occur
 *
 * @return NULL if allocation fails, valuetype otherwise
 */
j9object_t
getFlattenableField(J9VMThread *currentThread, J9RAMFieldRef *cpEntry, j9object_t receiver, BOOLEAN fastPath);

/**
 * Performs a clone operation on an object.
 *
 * @param currentThread thread token
 * @param receiverClass j9class of original object
 * @param original object to be cloned
 * @param fastPath performs fastpath allocation, no GC. If this is false
 * 			frame must be built before calling as GC may occur
 *
 * @return NULL if allocation fails, valuetype otherwise
 */
j9object_t
cloneValueType(J9VMThread *currentThread, J9Class *receiverClass, j9object_t original, BOOLEAN fastPath);

/**
 * Performs a putfield operation on an object. Handles flattened and non-flattened cases.
 * This helper assumes that the cpIndex points to a resolved null-restricted fieldRef. This helper
 * also assumes that the cpIndex points to an instance field.
 *
 * @param currentThread thread token
 * @param cpEntry the RAM cpEntry for the field, needs to be resolved
 * @param receiver receiver object
 * @param paramObject parameter object
 */
void
putFlattenableField(J9VMThread *currentThread, J9RAMFieldRef *cpEntry, j9object_t receiver, j9object_t paramObject);

/**
* @brief
* @param *vmStruct
* @param *clazz
* @param *fieldName
* @param fieldNameLength
* @param *signature
* @param signatureLength
* @param **definingClass
* @param *staticField
* @param options
* @param *sourceClass
* @return void *
*/
void *
staticFieldAddress(J9VMThread *vmStruct, J9Class *clazz, U_8 *fieldName, UDATA fieldNameLength, U_8 *signature, UDATA signatureLength, J9Class **definingClass, UDATA *staticField, UDATA options, J9Class *sourceClass);

/**
* @brief Get the J9ROMFieldShape of all static fields of the given class.
*
* Count the static fields declared by romClass and collect their J9ROMFieldShapes into outFields if specified.
*
* @param *currentThread
* @param *romClass The J9ROMClass whose static fields should be reported.
* @param *outFields The resulting array of J9ROMFieldShape pointers. May be null.
* @return The number of static fields declared by the class.
*/
UDATA
getStaticFields(J9VMThread *currentThread, J9ROMClass *romClass, J9ROMFieldShape **outFields);

/**
 *@brief find field in class
 *@param vmstruct vmthread token
 *@param clazz ramclass
 *@param fieldName name of field
 *@param fieldNameLength length of field name
 *@param signature field signature
 *@param signatureLength length of field name signature
 *@param definingClass class that defines the field
 *@param offsetAddress instance field offset or static field address
 *@param options lookup options
 *@return romfieldShape if field is found
 */
J9ROMFieldShape*
findFieldExt(J9VMThread *vmStruct, J9Class *clazz, U_8 *fieldName, UDATA fieldNameLength, U_8 *signature, UDATA signatureLength, J9Class **definingClass, UDATA *offsetOrAddress, UDATA options);

/**
* @brief
* @param *vm: Reference to the VM, used to locate the table.
* @param *ramClass: key for the table
* @returns none
* @exceptions none
*/
void
fieldIndexTableRemove(J9JavaVM* vm, J9Class *ramClass);

/* ---------------- resolvesupport.c ---------------- */

#if JAVA_SPEC_VERSION < 24
/**
 * Perform a package access check from the ProtectionDomain to the targetClass
 * No check is required if no SecurityManager is in place.  If a check is required and the
 * current thread is not able to run java code, the check will be considered to have failed.
 * If the check is aborted due to pop frame, the check will be considered to have failed.
 *
 * @param *currentThread the current J9VMThread
 * @param *targetClass the J9Class which might be in a restricted package
 * @param protectionDomain the ProtectionDomain of the class attempting to access targetClass
 * @param canRunJavaCode non-zero if the current thread is in a state that java code can be executed
 * @return UDATA non-zero if the access is legal
 */
UDATA
packageAccessIsLegal(J9VMThread *currentThread, J9Class *targetClass, j9object_t protectionDomain, UDATA canRunJavaCode);

/**
 * Determine if the targetClass is subject to the package access check.
 * Assuming targetClass is NOT NULL.
 *
 * @param *vm[in] the J9JavaVM
 * @param srcClassLoader[in] Current class loader creating RAM class
 * @param srcModule[in] The module where current RAM class is loaded from
 * @param targetClass[in] The RAM class being examined to be determined if a package access check should be performed
 * @return TRUE if a package access check is required, otherwise FALSE.
 */
BOOLEAN
requirePackageAccessCheck(J9JavaVM *vm, J9ClassLoader *srcClassLoader, J9Module *srcModule, J9Class *targetClass);
#endif /* JAVA_SPEC_VERSION < 24 */

/**
 * @brief
 * @param *vmStruct
 * @param *constantPool
 * @param cpIndex
 * @return j9object_t
 */
j9object_t
resolveStringRef (J9VMThread *vmStruct, J9ConstantPool *constantPool, UDATA cpIndex, UDATA resolveFlags);


/**
 * @brief
 * @param *vmStruct
 * @param *ramCP
 * @param cpIndex
 * @param resolveFlags
 * @return J9Class *
 */
J9Class *
resolveClassRef(J9VMThread *vmStruct, J9ConstantPool *ramCP, UDATA cpIndex, UDATA resolveFlags);


/**
 * @brief
 * @param *vmStruct
 * @param *ramCP
 * @param fieldRefCpIndex
 * @return J9Class *
 */
J9Class *
findFieldSignatureClass(J9VMThread *vmStruct, J9ConstantPool *ramCP, UDATA fieldRefCpIndex);


/**
 * @brief
 * @param *vmStruct
 * @param *ramCP
 * @param cpIndex
 * @param resolveFlags
 * @param *ramCPEntry
 * @return J9Method *
 */
J9Method *
resolveStaticMethodRefInto(J9VMThread *vmStruct, J9ConstantPool *ramCP, UDATA cpIndex, UDATA resolveFlags, J9RAMStaticMethodRef *ramCPEntry);


/**
 * @brief
 * @param *vmStruct
 * @param *ramCP
 * @param cpIndex
 * @param resolveFlags
 * @return J9Method *
 */
J9Method *
resolveStaticMethodRef(J9VMThread *vmStruct, J9ConstantPool *ramCP, UDATA cpIndex, UDATA resolveFlags);


/**
 * @brief
 * @param *vmStruct
 * @param *ramCP
 * @param splitTableIndex
 * @param resolveFlags
 * @return J9Method *
 */
J9Method *
resolveStaticSplitMethodRef(J9VMThread *vmStruct, J9ConstantPool *ramCP, UDATA splitTableIndex, UDATA resolveFlags);

/**
 * @brief
 * @param *vmStruct
 * @param *method
 * @param *ramCP
 * @param cpIndex
 * @param resolveFlags
 * @param **resolvedField
 * @param *ramCPEntry
 * @return void *
 */
void *
resolveStaticFieldRefInto(J9VMThread *vmStruct, J9Method *method, J9ConstantPool *ramCP, UDATA cpIndex, UDATA resolveFlags, J9ROMFieldShape **resolvedField, J9RAMStaticFieldRef *ramCPEntry);


/**
 * @brief
 * @param *vmStruct
 * @param *method
 * @param *ramCP
 * @param cpIndex
 * @param resolveFlags
 * @param **resolvedField
 * @return void *
 */
void *
resolveStaticFieldRef(J9VMThread *vmStruct, J9Method *method, J9ConstantPool *ramCP, UDATA cpIndex, UDATA resolveFlags, J9ROMFieldShape **resolvedField);


/**
 * @brief
 * @param *vmStruct
 * @param *method
 * @param *ramCP
 * @param cpIndex
 * @param resolveFlags
 * @param **resolvedField
 * @param *ramCPEntry
 * @return IDATA
 */
IDATA
resolveInstanceFieldRefInto(J9VMThread *vmStruct, J9Method *method, J9ConstantPool *ramCP, UDATA cpIndex, UDATA resolveFlags, J9ROMFieldShape **resolvedField, J9RAMFieldRef *ramCPEntry);


/**
 * @brief
 * @param *vmStruct
 * @param *method
 * @param *ramCP
 * @param cpIndex
 * @param resolveFlags
 * @param **resolvedField
 * @return IDATA
 */
IDATA
resolveInstanceFieldRef(J9VMThread *vmStruct, J9Method *method, J9ConstantPool *ramCP, UDATA cpIndex, UDATA resolveFlags, J9ROMFieldShape **resolvedField);


/**
 * @brief
 * @param *vmStruct
 * @param *ramCP
 * @param cpIndex
 * @param resolveFlags
 * @param *ramCPEntry
 * @return UDATA
 */
J9Method *
resolveInterfaceMethodRefInto(J9VMThread *vmStruct, J9ConstantPool *ramCP, UDATA cpIndex, UDATA resolveFlags, J9RAMInterfaceMethodRef *ramCPEntry);


/**
 * @brief
 * @param *vmStruct
 * @param *ramCP
 * @param cpIndex
 * @param resolveFlags
 * @return UDATA
 */
J9Method *
resolveInterfaceMethodRef(J9VMThread *vmStruct, J9ConstantPool *ramCP, UDATA cpIndex, UDATA resolveFlags);


/**
 * @brief
 * @param *vmStruct
 * @param *ramCP
 * @param cpIndex
 * @param resolveFlags
 * @param *ramCPEntry
 * @return J9Method *
 */
J9Method *
resolveSpecialMethodRefInto(J9VMThread *vmStruct, J9ConstantPool *ramCP, UDATA cpIndex, UDATA resolveFlags, J9RAMSpecialMethodRef *ramCPEntry);


/**
 * @brief
 * @param *vmStruct
 * @param *ramCP
 * @param cpIndex
 * @param resolveFlags
 * @return J9Method *
 */
J9Method *
resolveSpecialMethodRef(J9VMThread *vmStruct, J9ConstantPool *ramCP, UDATA cpIndex, UDATA resolveFlags);

/**
 * @brief
 * @param *vmStruct
 * @param *ramCP
 * @param splitTableIndex
 * @param resolveFlags
 * @return J9Method *
 */
J9Method *
resolveSpecialSplitMethodRef(J9VMThread *vmStruct, J9ConstantPool *ramCP, UDATA splitTableIndex, UDATA resolveFlags);

/**
 * @brief
 * @param *vmStruct
 * @param *ramCP
 * @param cpIndex
 * @param resolveFlags
 * @param *ramCPEntry
 * @return UDATA
 */
UDATA
resolveVirtualMethodRefInto(J9VMThread *vmStruct, J9ConstantPool *ramCP, UDATA cpIndex, UDATA resolveFlags, J9Method **resolvedMethod, J9RAMVirtualMethodRef *ramCPEntry);


/**
 * @brief
 * @param *vmStruct
 * @param *ramCP
 * @param cpIndex
 * @param resolveFlags
 * @return UDATA
 */
UDATA
resolveVirtualMethodRef(J9VMThread *vmStruct, J9ConstantPool *ramCP, UDATA cpIndex, UDATA resolveFlags, J9Method **resolvedMethod);


/* ---------------- segment.c ---------------- */

/**
* @brief
* @param state
*/
void
allClassesEndDo(J9ClassWalkState* state);


/**
* @brief
* @param state
* @return J9Class*
*/
J9Class*
allClassesNextDo(J9ClassWalkState* state);


/**
* @brief
* @param state
* @param vm
* @param classLoader
* @return J9Class*
*/
J9Class*
allClassesStartDo(J9ClassWalkState* state, J9JavaVM* vm, J9ClassLoader* classLoader);

/**
* @brief
* @param state
*/
void
allLiveClassesEndDo(J9ClassWalkState* state);


/**
* @brief
* @param state
* @return J9Class*
*/
J9Class*
allLiveClassesNextDo(J9ClassWalkState* state);


/**
* @brief
* @param state
* @param vm
* @param classLoader
* @return J9Class*
*/
J9Class*
allLiveClassesStartDo(J9ClassWalkState* state, J9JavaVM* vm, J9ClassLoader* classLoader);

/**
* @brief
* @param state
*/
void
allClassLoadersEndDo(J9ClassLoaderWalkState* state);


/**
* @brief
* @param state
* @return J9ClassLoader*
*/
J9ClassLoader*
allClassLoadersNextDo(J9ClassLoaderWalkState* state);


/**
* @brief
* @param state
* @param vm
* @param flags
* @return J9ClassLoader*
*/
J9ClassLoader*
allClassLoadersStartDo(J9ClassLoaderWalkState* state, J9JavaVM* vm, UDATA flags);

/* J9ClassLoaderWalkState flags */
#define J9CLASSLOADERWALK_INCLUDE_DEAD 1
#define J9CLASSLOADERWALK_EXCLUDE_LIVE 2

/**
* @brief
* @param *javaVM
* @param size
* @param type
* @param memoryCategory
* @return J9MemorySegment *
*/
J9MemorySegment *
allocateMemorySegment(J9JavaVM *javaVM, UDATA size, UDATA type, U_32 memoryCategory);


/**
* @brief
* @param *javaVM
* @param *segmentList
* @param size
* @param type
* @param memoryCategory
* @return J9MemorySegment *
*/
J9MemorySegment *
allocateMemorySegmentInList(J9JavaVM *javaVM, J9MemorySegmentList *segmentList, UDATA size, UDATA type, U_32 memoryCategory);


/**
* @brief
* @param *javaVM
* @param *segmentList
* @param size
* @param type
* @param *vmemParams
* @return J9MemorySegment *
*/
J9MemorySegment *
allocateVirtualMemorySegmentInList(J9JavaVM *javaVM, J9MemorySegmentList *segmentList, UDATA size, UDATA type, J9PortVmemParams *vmemParams);


/**
* @brief
* @param *javaVM
* @param requiredSize
* @param segmentType
* @param *classLoader
* @return allocationIncrement
*/
J9MemorySegment *
allocateClassMemorySegment(J9JavaVM *javaVM, UDATA requiredSize, UDATA segmentType, J9ClassLoader *classLoader, UDATA allocationIncrement);


/**
* @brief
* @param *javaVM
* @param *segmentList
* @param size
* @param type
* @param desiredAddress
* @param memoryCategory
* @return J9MemorySegment *
*/
J9MemorySegment *
allocateFixedMemorySegmentInList(J9JavaVM *javaVM, J9MemorySegmentList *segmentList, UDATA size, UDATA type, U_8* desiredAddress, U_32 memoryCategory);


/**
* @brief
* @param javaVM
* @param numberOfMemorySegments
* @param memoryCategory
* @return J9MemorySegmentList *
*/
J9MemorySegmentList *
allocateMemorySegmentList(J9JavaVM * javaVM, U_32 numberOfMemorySegments, U_32 memoryCategory);


/**
* @brief
* @param *segmentList
* @return J9MemorySegment *
*/
J9MemorySegment *
allocateMemorySegmentListEntry(J9MemorySegmentList *segmentList);


/**
* @brief
* @param javaVM
* @param numberOfMemorySegments
* @param sizeOfElements
* @return J9MemorySegmentList *
*/
J9MemorySegmentList *
allocateMemorySegmentListWithSize(J9JavaVM * javaVM, U_32 numberOfMemorySegments, UDATA sizeOfElements, U_32 memoryCategory);


/**
* @brief
* @param *javaVM
* @param *segment
* @param freeDescriptor
*/
void
freeMemorySegment(J9JavaVM *javaVM, J9MemorySegment *segment, BOOLEAN freeDescriptor);


/**
* @brief
* @param *javaVM
* @param *segmentList
*/
void
freeMemorySegmentList(J9JavaVM *javaVM,J9MemorySegmentList *segmentList);


/**
* @brief
* @param *segmentList
* @param *segment
*/
void
freeMemorySegmentListEntry(J9MemorySegmentList *segmentList, J9MemorySegment *segment);

/**
* @brief Iterate through the segmentList and pass the J9MemorySegment * to the segmentCallback
* @param segmentList The J9MemorySegmentList to iterate through.  Must not be NULL
* @param segmentCallBack The user supplied callback that operates on the segment.  Must not be NULL.
* @param userData A void* passed through to the callback for tracking state
*/
void
allSegmentsInMemorySegmentListDo(J9MemorySegmentList *segmentList, void (* segmentCallback)(J9MemorySegment*, void*), void *userData);

/**
* @brief
* @param *segmentList
* @return U_32
*/
U_32
memorySegmentListSize (J9MemorySegmentList *segmentList);


/**
* @brief
* @param *vm
* @param *segmentList
* @param valueToFind
* @return J9MemorySegment *
*/
J9MemorySegment *
findMemorySegment(J9JavaVM *javaVM, J9MemorySegmentList *segmentList, UDATA valueToFind);

/**
* @brief
* @param javaVM
* @param numberOfMemorySegments
* @param flags
* @param memoryCategory
* @return J9MemorySegmentList *
*/
J9MemorySegmentList *
allocateMemorySegmentListWithFlags(J9JavaVM * javaVM, U_32 numberOfMemorySegments, UDATA flags, U_32 memoryCategory);

/**
 * @brief Allocate a segment in the segment list.
 *
 * @param segmentList pointer to the memory segment list
 */
J9MemorySegment *
allocateMemorySegmentListEntry(J9MemorySegmentList *segmentList);

/**
 * @brief Disclaim class memory of all class loaders. Currently, only
 * supported on Linux, no-op on other platforms.
 *
 * @param vm J9JavaVM token.
 * @param flags Flags that control disclaim.
 * @return TRUE on successful disclaim, FALSE otherwise.
 */
BOOLEAN
disclaimClassMemory(J9JavaVM *vm, UDATA flags);

/**
 * @brief Returns the total number of disclaimable segments.
 *
 * @param vm J9JavaVM token.
 * @return number of disclaimable segments.
 */
UDATA
totalNumberOfDisclaimableClassMemorySegments(J9JavaVM *vm);

/* ---------------- sighelp.c ---------------- */
#define J9_SIG_ERR (-1)
#define J9_SIG_IGNORED 1

#define J9_SIG_PREFIX "SIG"

/**
 * @brief Return the signal number from the name, or J9_SIG_ERR (-1)
 * if not found.
 * @param signame
 * @return jint
 */
jint
signalNameToValue(const char *signalName);

/**
 * @brief Return the signal name from the number, or NULL
 * if not found.
 * @param signal
 * @return const char *
 */
const char *
signalValueToName(jint signal);

/* ---------------- statistics.c ---------------- */
/**
* @brief
* @param *javaVM
* @param *name
* @param dataType
* @return void *
*/
void *
addStatistic (J9JavaVM* javaVM, U_8 * name, U_8 dataType);


/**
* @brief
* @param *javaVM
* @param *name
* @return void *
*/
void *
getStatistic (J9JavaVM* javaVM, U_8 * name);

/* ---------------- stringhelpers.cpp ---------------- */

/**
 * @brief Compare a java string to another java string for character equality.
 * @param *vmThread
 * @param *string1
 * @param *string2
 * @returns 1 if the strings are equal, 0 otherwise
 */

UDATA
compareStrings(J9VMThread *vmThread, j9object_t string1, j9object_t string2);

/**
 * @brief
 * @param *javaVM
 * @param *stringObject
 * @param stringFlags
 * @param *utfData
 * @param utfLength
 * @returns UDATA
 */
UDATA
compareStringToUTF8(J9VMThread * vmThread, j9object_t stringObject, UDATA stringFlags, const U_8 * utfData, UDATA utfLength);


/**
* @brief
* @param *vm
* @param *header
* @param isBaseType
* @param *classLoader
* @return J9MemorySegment *
*/
J9MemorySegment *
romImageNewSegment(J9JavaVM *vm, J9ROMImageHeader *header, UDATA isBaseType, J9ClassLoader *classLoader );


/**
 * Copy a string object to a UTF8 data buffer, and optionally prepend a string before it.
 *
 * @note The caller must free the memory from this pointer if the return value is NOT the buffer argument.
 * @note If the buffer is not large enough to encode the string this function will allocate enough memory to encode
 *       the worst-case UTF8 encoding of the supplied UTF16 string (length of string * 3 bytes).
 *
 * @param[in] currentThread the current J9VMThread
 * @param[in] string a string object to be copied
 * 				it can't be NULL
 * @param[in] stringFlags the flag to determine performing '.' --> '/' or NULL termination
 * @param[in] prependStr the string to be prepended before the string object to be copied
 * 				it can't be NULL but can be an empty string ""
 * @param[in] prependStrLength The length of prependStr as computed by strlen.
 * @param[in] buffer the buffer for the string
 * @param[in] bufferLength the buffer length
 * @param[out] utf8Length If not NULL returns the computed length (in bytes) of the copied UTF8 string in the buffer excluding the NULL terminator.
 *
 * @return a char pointer to the string
 */
char*
copyStringToUTF8WithMemAlloc(J9VMThread *vmThread, j9object_t string, UDATA stringFlags, const char *prependStr, UDATA prependStrLength, char *buffer, UDATA bufferLength, UDATA *utf8Length);


/**
* Copy a string object to a J9UTF8 data buffer, and optionally prepend a string before it.
*
* @note The caller must free the memory from this pointer if the return value is NOT the buffer argument.
* @note If the buffer is not large enough to encode the string this function will allocate enough memory to encode
*       the worst-case UTF8 encoding of the supplied UTF16 string (length of string * 3 bytes).
*
* @param[in] currentThread the current J9VMThread
* @param[in] string a string object to be copied
* 				it can't be NULL
* @param[in] stringFlags the flag to determine performing '.' --> '/' or NULL termination
* @param[in] prependStr the string to be prepended before the string object to be copied
* 				it can't be NULL but can be an empty string ""
* @param[in] prependStrLength The length of prependStr as computed by strlen.
* @param[in] buffer the buffer for the string
* @param[in] bufferLength the buffer length
*
* @return a J9UTF8 pointer to the string
*/
J9UTF8*
copyStringToJ9UTF8WithMemAlloc(J9VMThread *vmThread, j9object_t string, UDATA stringFlags, const char *prependStr, UDATA prependStrLength, char *buffer, UDATA bufferLength);

/**
 * Copy a string object to a J9UTF8 allocated via a port library, and optionally prepend a string
 * before it.
 *
 * @note The caller must free the memory from this pointer from the same port library memory allocator.
 *
 * @param[in] currentThread the current J9VMThread
 * @param[in] string a string object to be copied
 * 				it can't be NULL
 * @param[in] stringFlags the flag to determine performing '.' --> '/' or NULL termination
 * @param[in] prependStr the string to be prepended before the string object to be copied
 *				it can't be NULL but can be an empty string ""
 * @param[in] prependStrLength the length of prependStr as computed by strlen
 * @param[in] portLib the OMRPortLibrary from which to allocate the buffer
 *
 * @return a J9UTF8 pointer to the string
 */
J9UTF8 *
copyStringToJ9UTF8WithPortLib(J9VMThread *vmThread, j9object_t string, UDATA stringFlags, const char *prependStr, UDATA prependStrLength, OMRPortLibrary *portLib);

/**
 * Copy a J9UTF8 to a UTF8 data buffer, and optionally prepend a string before it.
 *
 * @note The caller must free the memory from this pointer if the return value is NOT the buffer argument.
 * @note If the buffer is not large enough to encode the string this function will allocate.
 *
 * @param[in] currentThread the current J9VMThread
 * @param[in] string a J9UTF8 pointer to the data to be copied
 * 				it can't be NULL
 * @param[in] stringFlags the flag to determine performing '.' --> '/' or NULL termination
 * @param[in] prependStr the string to be prepended before the string object to be copied
 * 				it can't be NULL but can be an empty string ""
 * @param[in] prependStrLength The length of prependStr as computed by strlen.
 * @param[in] buffer the buffer for the string
 * @param[in] bufferLength the buffer length
 *
 * @return a char pointer to the string
 */
char *
copyJ9UTF8ToUTF8WithMemAlloc(J9VMThread *vmThread, J9UTF8 *string, UDATA stringFlags, const char *prependStr, UDATA prependStrLength, char *buffer, UDATA bufferLength);

/**
 * Creates a fresh copy of a J9UTF8, and optionally prepend a string before it.
 *
 * @note The caller must free the memory from this pointer if the return value is NOT the buffer argument.
 * @note If the buffer is not large enough to encode the string this function will allocate.
 *
 * @param[in] currentThread the current J9VMThread
 * @param[in] string a J9UTF8 pointer to the data to be copied
 * 				it can't be NULL
 * @param[in] stringFlags the flag to determine performing '.' --> '/' or NULL termination
 * @param[in] prependStr the string to be prepended before the string object to be copied
 * 				it can't be NULL but can be an empty string ""
 * @param[in] prependStrLength The length of prependStr as computed by strlen.
 * @param[in] buffer the buffer for the string
 * @param[in] bufferLength the buffer length
 *
 * @return a J9UTF8 pointer to the string
 */
J9UTF8 *
copyJ9UTF8WithMemAlloc(J9VMThread *vmThread, J9UTF8 *string, UDATA stringFlags, const char *prependStr, UDATA prependStrLength, char *buffer, UDATA bufferLength);

/**
 * Creates a fresh copy of a J9UTF8 allocated via a specified port library, and optionally prepend
 * a string it.
 *
 * @note The caller must free the memory from this pointer from the same port library memory allocator.
 *
 * @param[in] currentThread the current J9VMThread
 * @param[in] string a J9UTF8 pointer to the data to be copied
 * 				it can't be NULL
 * @param[in] stringFlags the flag to determine performing '.' --> '/' or NULL termination
 * @param[in] prependStr the string to be prepended before the string object to be copied
 * 				it can't be NULL but can be an empty string ""
 * @param[in] prependStrLength The length of prependStr as computed by strlen.
 * @param[in] portLib the OMRPortLibrary from which to allocate the buffer
 *
 * @return a J9UTF8 pointer to the string
 */
J9UTF8 *
copyJ9UTF8WithPortLib(J9VMThread *vmThread, J9UTF8 *string, UDATA stringFlags, const char *prependStr, UDATA prependStrLength, OMRPortLibrary *portLib);

/**
 * Copy a Unicode String to a UTF8 data buffer.
 *
 * @param[in] vmThread the current J9VMThread
 * @param[in] string a string object to be copied, it can't be NULL
 * @param[in] stringFlags the flag to determine performing '.' --> '/' or NULL termination
 * @param[in] stringOffset the offset into \p string at which to start the copy
 * @param[in] stringLength the number of \p string characters to copy
 * @param[in] utf8Data a utf8 data buffer
 * @param[in] utf8DataLength the length of utf8Data in number of bytes
 *
 * @return The computed length (in bytes) of the copied UTF8 string in the buffer excluding any NULL terminator.
 */
UDATA
copyStringToUTF8Helper(J9VMThread *vmThread, j9object_t string, UDATA stringFlags, UDATA stringOffset, UDATA stringLength, U_8 *utf8Data, UDATA utf8DataLength);


/**
 * @brief Find the length of the string object when it is converted to UTF-8.
 *
 * Note: On 32-bit platforms, the length may be truncated.
 *
 * @param vm a pointer to J9JavaVM
 * @param string a string object
 *
 * @return the length of the string in UTF-8
 */
UDATA
getStringUTF8Length(J9VMThread *vmThread, j9object_t string);

/**
 * @brief Find the length of the string object when it is converted to UTF-8, but truncate it
 * using maxLength as the upper bound.
 *
 * @param vm a pointer to J9JavaVM
 * @param string a string object
 * @param maxLength the upper bound of the length used for truncation
 *
 * @return the length of the string in UTF-8
 */
U_64
getStringUTF8LengthTruncated(J9VMThread *vmThread, j9object_t string, U_64 maxLength);


/**
* Check incoming class name characters and return following values accordingly:
* 	CLASSNAME_INVALID - if there is a character '/';
* 	CLASSNAME_VALID_NON_ARRARY - if it is valid and there is no '[' at beginning of class name string;
* 	CLASSNAME_VALID_ARRARY - if it is valid and there is a '[' at beginning of class name string.
*
* @param[in] *vmThread current thread
* @param[in] className the class name string
* @param[in] classNameLength the length of the class name string
* @param[in] allowedBitsForClassName the allowed bits for a valid class name,
*            including CLASSNAME_VALID_NON_ARRARY, CLASSNAME_VALID_ARRARY, or CLASSNAME_VALID.
*
* @return a UDATA to indicate the nature of incoming class name string, see descriptions above.
*/
UDATA
verifyQualifiedName(J9VMThread *vmThread, U_8 *className, UDATA classNameLength, UDATA allowedBitsForClassName);


/* ---------------- swalk.c ---------------- */

#if (!defined(J9VM_INTERP_STACKWALK_TRACING))
/**
* @brief
* @param currentThread
* @param walkState
*/
void
freeStackWalkCaches(J9VMThread * currentThread, J9StackWalkState * walkState);
#endif /* J9VM_!INTERP_STACKWALK_TRACING */


#if defined(J9VM_INTERP_STACKWALK_TRACING)
/**
* @brief
* @param walkState
* @param objectSlot
*/
void
swMarkSlotAsObject(J9StackWalkState * walkState, j9object_t * objectSlot);
#endif /* J9VM_INTERP_STACKWALK_TRACING */


#if (defined(J9VM_INTERP_STACKWALK_TRACING))
/**
* @brief
* @param walkState
* @param level
* @param format
* @param ...
*/
void
swPrintf(J9StackWalkState * walkState, UDATA level, char * format, ...);
#endif /* J9VM_INTERP_STACKWALK_TRACING */


#if (defined(J9VM_INTERP_STACKWALK_TRACING))
/**
* @brief
* @param walkState
*/
void
swPrintMethod(J9StackWalkState * walkState);
#endif /* J9VM_INTERP_STACKWALK_TRACING */


#if (defined(J9VM_INTERP_STACKWALK_TRACING))
/**
* @brief
* @param walkState
* @param intSlot
* @param indirectSlot
* @param tag
*/
void
swWalkIntSlot(J9StackWalkState * walkState, UDATA * intSlot, void * indirectSlot, void * tag);
#endif /* J9VM_INTERP_STACKWALK_TRACING */


#if (defined(J9VM_INTERP_STACKWALK_TRACING))
/**
* @brief
* @param walkState
* @param objectSlot
* @param indirectSlot
* @param tag
*/
void
swWalkObjectSlot(J9StackWalkState * walkState, j9object_t * objectSlot, void * indirectSlot, void * tag);
#endif /* J9VM_INTERP_STACKWALK_TRACING */


/**
* @brief
* @param walkState
* @return UDATA
*/
UDATA
walkFrame(J9StackWalkState * walkState);


/**
* @brief
* @param *currentThread
* @param *walkState
* @return UDATA
*/
UDATA
walkStackFrames(J9VMThread *currentThread, J9StackWalkState *walkState);


/**
* @brief Print and assert when an invalid return address is detected in a JIT frame.
* @param *walkState
*/
void
invalidJITReturnAddress(J9StackWalkState *walkState);


/**
 * Walk the stack slots (the pending pushes and locals) of a bytecoded frame.  The numberOfLocals
 * parameter must represent the true count, including the hidden locals for AI count, sync object or
 * receiver object for Object <init>.
 *
 * @param[in] *walkState current J9StackWalkState pointer
 * @param[in] *method method whose slots are being walked
 * @param[in] offsetPC index into the bytecode array
 * @param[in] *pendingBase highest-memory pending slot pointer
 * @param[in] pendingStackHeight number of pending slots to walk
 * @param[in] localBase highest-memory local slot pointer (e.g. arg0EA)
 * @param[in] numberOfLocals number of local slots (see above)
 * @param[in] alwaysLocalMap TRUE to force use of the local mapper, FALSE to use normal walkState logic
 */
void
walkBytecodeFrameSlots(J9StackWalkState *walkState, J9Method *method, UDATA offsetPC, UDATA *pendingBase, UDATA pendingStackHeight, UDATA *localBase, UDATA numberOfLocals, UDATA alwaysLocalMap);


/* ---------------- trace.c ---------------- */

#if (defined(J9VM_INTERP_TRACING)  || defined(J9VM_INTERP_UPDATE_VMCTRACING))  /* File Level Build Flags */

#if (defined(J9VM_INTERP_UPDATE_VMCTRACING))
/**
* @brief
* @param vmc
* @param writesVMThread
*/
void
postHelperCall(J9VMThread * vmc, int writesVMThread);
#endif /* J9VM_INTERP_UPDATE_VMCTRACING */


#if (defined(J9VM_INTERP_UPDATE_VMCTRACING))
/**
* @brief
* @param vmc
* @param *sp
* @param *pc
* @param *literals
* @param *arg0EA
* @param readsVMC
* @param writesVMC
* @param *helperName
* @param *caller
*/
void
preHelperCall(J9VMThread * vmc, void *sp, void *pc, void *literals, void *arg0EA, int readsVMC,
						  int writesVMC, char *helperName, char *caller);
#endif /* J9VM_INTERP_UPDATE_VMCTRACING */


/**
* @brief
* @param *vmStruct
*/
void
trace(J9VMThread *vmStruct);


#endif /* J9VM_INTERP_TRACING || INTERP_UPDATE_VMCTRACING */ /* End File Level Build Flags */

/* ---------------- visible.c ---------------- */
#if JAVA_SPEC_VERSION >= 11
/**
 * Loads the nest host and ensures that the nest host belongs
 * to the same runtime package as the class. This function requires
 * VMAccess
 *
 * @param[in] vmThread handle to vmThread
 * @param[in] clazz the class to search the nest host
 * @param[in] options lookup options
 * @param[out] nestHostFound the nest host of clazz
 *
 * @return 	J9_VISIBILITY_ALLOWED if success,
 * 			J9_VISIBILITY_NEST_HOST_LOADING_FAILURE_ERROR if failed to load nesthost,
 * 			J9_VISIBILITY_NEST_HOST_DIFFERENT_PACKAGE_ERROR if nesthost is not in the same runtime package
 */
UDATA
loadAndVerifyNestHost(J9VMThread *vmThread, J9Class *clazz, UDATA options, J9Class **nestHostFound);

/**
 * Sets the nestmates error based on the errorCode
 *
 * @param vmThread vmthread token
 * @param nestMember the j9lass requesting the nesthost
 * @param nestHost the actual nest host, this may be NULL
 * @param errorCode the error code representing the exception to throw
 * 	J9_VISIBILITY_NEST_HOST_LOADING_FAILURE_ERROR
 * 	J9_VISIBILITY_NEST_HOST_DIFFERENT_PACKAGE_ERROR
 * 	J9_VISIBILITY_NEST_MEMBER_NOT_CLAIMED_ERROR
 */
void
setNestmatesError(J9VMThread *vmThread, J9Class *nestMember, J9Class *nestHost, IDATA errorCode);
#endif /* JAVA_SPEC_VERSION >= 11 */

/* ---------------- VMAccess.cpp ---------------- */

/**
* @brief
* @param currentThread
* @param vmThread
*/
void
haltThreadForInspection(J9VMThread * currentThread, J9VMThread * vmThread);


/**
* @brief
* @param currentThread
* @param vmThread
*/
void
resumeThreadForInspection(J9VMThread * currentThread, J9VMThread * vmThread);


/**
* @brief
* @param vmThread
*/
void
acquireExclusiveVMAccess(J9VMThread * vmThread);

/**
* @brief
* @param vmThread
*/
void
acquireSafePointVMAccess(J9VMThread * vmThread);


/**
* @brief
* @param vm
*/
void
acquireExclusiveVMAccessFromExternalThread(J9JavaVM * vm);


/**
* @brief
* @param vmThread
* @param flags
*/
void
internalAcquireVMAccessClearStatus(J9VMThread * vmThread, UDATA flags);


/**
* @brief
* @param vmThread
*/
void
internalAcquireVMAccessNoMutex(J9VMThread * vmThread);


/**
* @brief Called when a JIT helper detects it does not have VM access.  Asserts and brings down the VM.
* @param vmThread
*/
void
mustHaveVMAccess(J9VMThread * vmThread);

/**
* @brief
* @param vmThread
* @param haltMask
*/
void
internalAcquireVMAccessNoMutexWithMask(J9VMThread * vmThread, UDATA haltMask);


/**
* @brief
* @param vmThread
* @param haltMask
*/
void
internalAcquireVMAccessWithMask(J9VMThread * vmThread, UDATA haltMask);


/**
* @brief
* @param vmThread
*/
void
internalReleaseVMAccessNoMutex(J9VMThread * vmThread);


/**
* @brief
* @param vmThread
* @param flags
*/
void
internalReleaseVMAccessSetStatus(J9VMThread * vmThread, UDATA flags);


/**
* @brief
* @param vmThread
* @return IDATA
*/
IDATA
internalTryAcquireVMAccessNoMutex(J9VMThread * vmThread);


/**
* @brief
* @param vmThread
* @param haltMask
* @return IDATA
*/
IDATA
internalTryAcquireVMAccessWithMask(J9VMThread * vmThread, UDATA haltMask);


/**
* @brief
* @param vmThread
*/
void
releaseExclusiveVMAccess(J9VMThread * vmThread);

/**
* @brief
* @param vmThread
*/
void
releaseSafePointVMAccess(J9VMThread * vmThread);


/**
* @brief
* @param vm
*/
void
releaseExclusiveVMAccessFromExternalThread(J9JavaVM * vm);


#if (defined(J9VM_GC_REALTIME))
/**
* @brief initiates an exclusive access request for metronome
* @param vm
* @param block input parameter specifying whether caller should block if another request is ongoing
* @param responsesRequired the number of mutator threads that must voluntarily quiesce themselves
* @param gcPriority returned the new gc collector priority
* @return effectively a boolean the request is successful or not
*/
UDATA
requestExclusiveVMAccessMetronome(J9JavaVM *vm, UDATA block, UDATA *responsesRequired, UDATA *gcPriority);

/**
* @brief initiates an exclusive access request for metronome
* @param vm
* @param block input parameter specifying whether caller should block if another request is ongoing
* @param vmResponsesRequired the number of mutator threads holding VM access that must voluntarily quiesce themselves
* @param jniResponsesRequired the number of mutator threads holding JNI critical access that must voluntarily quiesce themselves
* @param gcPriority returned the new gc collector priority
* @return effectively a boolean the request is successful or not
*/
UDATA
requestExclusiveVMAccessMetronomeTemp(J9JavaVM *vm, UDATA block, UDATA *vmResponsesRequired, UDATA *jniResponsesRequired, UDATA *gcPriority);

/**
* @brief waits for the responses to an exclusive access request by requestExclusiveVMAccessMetronome
* @param vm
* @param responsesRequired the number of mutator threads that must voluntarily quiesce themselves
*/
void
waitForExclusiveVMAccessMetronome(J9VMThread * vmThread, UDATA responsesRequired);

/**
* @brief waits for the responses to an exclusive access request by requestExclusiveVMAccessMetronome
* @param vm
* @param vmResponsesRequired the number of mutator threads holding VM access that must voluntarily quiesce themselves
* @param jniResponsesRequired the number of mutator threads holding JNI critical access that must voluntarily quiesce themselves

*/
void
waitForExclusiveVMAccessMetronomeTemp(J9VMThread * vmThread, UDATA vmResponsesRequired, UDATA jniResponsesRequired);

/**
* @brief releases the exclusive access
* @param vm
*/
void
releaseExclusiveVMAccessMetronome(J9VMThread * vmThread);
#endif /* J9VM_GC_REALTIME */

/**
 * Release VM and/or JNI critical access. Record what was held in accessMask.
 * This will respond to any pending exclusive VM access request in progress.
 *
 * This function is intended for use with releaseAccess.
 *
 * @param vmThread  the J9VMThread requesting access
 * @param accessMask  the types of access to re-acquire
 */
void
releaseAccess(J9VMThread* vmThread, UDATA* accessMask);

/**
 * Re-acquire VM and/or JNI critical access as specified by the accessMask.
 * This will block if another thread holds exclusive VM access.
 *
 * This function is intended for use with reacquireAccess.
 *
 * @param vmThread  the J9VMThread requesting access
 * @param accessMask  the types of access that were held
 */
void
reacquireAccess(J9VMThread* vmThread, UDATA accessMask);

/* ---------------- vmbootlib.c ---------------- */

/**
* @brief
* @param vm
* @param libName
* @param handlePtr
* @param suppressError
* @return UDATA
*/
UDATA
openBootstrapLibrary(J9JavaVM* vm, char * libName, UDATA* handlePtr, UDATA suppressError);


/**
* @brief
* @param vmThread
* @param libName
* @param libraryPtr
* @param suppressError
* @return UDATA
*/
UDATA
registerBootstrapLibrary(J9VMThread * vmThread, const char * libName, J9NativeLibrary** handlePtr, UDATA suppressError);


/**
* @brief
* @param vmThread
* @param classLoader
* @param libName
* @param libraryPath
* @param libraryPtr
* @param errorBuffer
* @param bufferLength
* @return UDATA
*/
UDATA
registerNativeLibrary(J9VMThread *vmThread, J9ClassLoader *classLoader, const char *libName, const char *libraryPath, J9NativeLibrary **libraryPtr, char *errorBuffer, UDATA bufferLength);


/**
 * Initialize native library callback functions to default values.
 * \param javaVM
 * \param library The library to initialize.
 * \return Zero on success, non-zero on failure.
 */
UDATA
initializeNativeLibrary(J9JavaVM * javaVM, J9NativeLibrary* library);


#if defined(J9VM_ZOS_3164_INTEROPERABILITY) && (JAVA_SPEC_VERSION >= 17)
/**
 * Invoke JNI_OnLoad/JNI_OnUnload functions in 31-bit interoperability native target library.
 * @param vm The J9JavaVM pointer passed as first parameter to JNI_OnXLoad function
 * @param handle The target function pointer to invoke - should be a 31-bit interop target
 * @param isOnLoad JNI_TRUE if invoking JNI_OnLoad, JNI_FALSE if invoking JNI_OnUnload
 * @param reserved The reserved second parameter to JNI_OnXLoad function
 * @return the return value for JNI_OnLoad, or 0 for JNI_OnUnload
 */
I_32
invoke31BitJNI_OnXLoad(J9JavaVM *vm, void *handle, jboolean isOnLoad, void *reserved);
#endif /* defined(J9VM_ZOS_3164_INTEROPERABILITY) && (JAVA_SPEC_VERSION >= 17) */


/* ---------------- vmhook.c ---------------- */

#if defined(J9VM_INTERP_NATIVE_SUPPORT)
/**
* @brief
* @param vm
* @return J9HookInterface**
*/
J9HookInterface**
getJITHookInterface(J9JavaVM* vm);
#endif /* INTERP_NATIVE_SUPPORT */


/**
* @brief
* @param vm
* @return J9HookInterface**
*/
J9HookInterface**
getVMHookInterface(J9JavaVM* vm);


/**
* @brief
* @param vm
* @return IDATA
*/
IDATA
initializeVMHookInterface(J9JavaVM* vm);

/**
 * @brief Retrieves the address of the default value slot for a value class
 * @param clazz The class to retrieve the default address value for. Must be an initialized value class.
 * @return the address of the default value slot for the value class
 */
j9object_t*
getDefaultValueSlotAddress(J9Class* clazz);

/**
* @brief
* @param vm
*/
void
shutdownVMHookInterface(J9JavaVM* vm);

/* ---------------- vmphases.c ---------------- */

/**
* @brief Sets the phase in vm->phase and notifies other components that the phase has changed.
* @param vm
* @param phase
*/
void
jvmPhaseChange(J9JavaVM* vm, UDATA phase);

/* ---------------- vmprops.c ---------------- */

/**
* @brief
* @param vm
*/
void
freeSystemProperties(J9JavaVM * vm);

/**
 * return a null-terminated modified UTF-8 version of charSequence.  Transliteration depends on the original encoding.
 * @param vm Java VM
 * @param userString system property value as provided by the user.  May contain embedded zero bytes.
 * @return copy of the string in Modified UTF-8, NULL if the string is invalid.
 * @note the return value must be freed by the caller.
 */
U_8*
getMUtf8String(J9JavaVM * vm, const char *userString, UDATA stringLength);

/**
* @brief
* @param vm
* @param name
* @param propertyPtr
* @return UDATA
*/
UDATA
getSystemProperty(J9JavaVM * vm, const char * name, J9VMSystemProperty ** propertyPtr);

/**
* @brief returns the J9VM version.
* @param vm
* @return const char*
 */
const char*
getJ9VMVersionString(J9JavaVM *vm);


/**
* @brief
* @param vm
* @return UDATA
*/
UDATA
initializeSystemProperties(J9JavaVM * vm);


/**
 * Assign a copy of value to the property.
* @param vm
 * @param property system property struct
 * @param value new value for the property
 * @return J9SYSPROP_ERROR_NONE on success
*/
UDATA
setSystemProperty(J9JavaVM * vm, J9VMSystemProperty * property, const char * value);


/**
 * Set the value of a system property to a new value.  Frees the old value if it used heap memory.
 * @param vm Java VM
 * @param property property to update
 * @param newValue the updated value of the property
 * @param allocated true if the value is in heap memory
 * @return J9SYSPROP_ERROR_NONE on success
 */
UDATA
setSystemPropertyValue(J9JavaVM * vm, J9VMSystemProperty * property, char * newValue, BOOLEAN allocated);
/**
 * Adds a new system property
 * @param vm
 * @param propName Null-terminated property name to be added.
 * @param propValue Null-terminated property name to be added.
 * @param flags
 * @return J9SYSPROP_ERROR_NONE on success, or a J9SYSPROP_ERROR_* value on failure.
 *
 * @note Does not check for duplicate entries, it is the caller responsibility to determine
 * if the system property exists prior to calling this function.
 */
UDATA
addSystemProperty(J9JavaVM * vm, const char* propName,  const char* propValue, UDATA flags);

/**
 * @brief Get the default system properties.
 *
 * @return an Object array of system property key value pairs
 */
jobjectArray getSystemPropertyList(JNIEnv *env);

/* ---------------- vmruntimestate.c ---------------- */

/**
 * Starts a new VM thread that listens for change in VM runtime state
 *
 * @param vm
 *
 * return 0 on success, -1 on error
 */
I_32
startVMRuntimeStateListener(J9JavaVM* vm);

/**
 * Stops VM runtime state listener thread
 *
 * @param vm
 *
 */
void
stopVMRuntimeStateListener(J9JavaVM *vm);

/**
 * Returns current VM runtime state
 *
 * @param vm
 *
 * @return either J9VM_RUNTIME_STATE_ACTIVE or J9VM_RUNTIME_STATE_IDLE
 *
 * @see updateVMRuntimeState
 */
U_32
getVMRuntimeState(J9JavaVM *vm);

/**
 * Sets VM runtime state to the given state
 *
 * @param vm
 * @param newState the new VM runtime state; valid values are J9VM_RUNTIME_STATE_ACTIVE or J9VM_RUNTIME_STATE_IDLE
 *
 * @return TRUE if state is successfully updated, FALSE otherwise
 *
 * @see getVMRuntimeState
 */
BOOLEAN
updateVMRuntimeState(J9JavaVM *vm, U_32 newState);

/**
 * Returns minimum time that the JVM waits in idle before setting its state as idle
 *
 * @param vm
 *
 * @return minimum idle wait time
 */
U_32
getVMMinIdleWaitTime(J9JavaVM *vm);

/* ---------------- vmthinit.c ---------------- */

/**
* @brief
* @param *vm
* @return UDATA
*/
UDATA
initializeVMThreading(J9JavaVM *vm);

/**
* Frees memory allocated for a J9VMThread
* @param *vm J9JavaVM struct to access portLibrary
* @param *vmThread J9VMThread struct which will be freed
*/
void
freeVMThread(J9JavaVM *vm, J9VMThread *vmThread);

/**
* @brief
* @param *vm
*/
void
terminateVMThreading(J9JavaVM *vm);


/* ---------------- vmthread.cpp ---------------- */

/*
 * Perform thread setup before any java code is run on the thread.
 * Triggers J9HOOK_THREAD_ABOUT_TO_START.
 *
 * @param currentThread the current J9VMThread
 */
void
threadAboutToStart(J9VMThread *currentThread);


/**
* @brief
* @param vm
* @param stackSize
* @param previousStack
* @return J9JavaStack *
*/
J9JavaStack *
allocateJavaStack(J9JavaVM * vm, UDATA stackSize, J9JavaStack * previousStack);


/**
* @brief
* @param vm
* @param stack
*/
void
freeJavaStack(J9JavaVM * vm, J9JavaStack * stack);


/**
* @brief
* @param currentThread
*/
void
fatalRecursiveStackOverflow(J9VMThread *currentThread);


/**
* @brief
* @param vm
* @param osThread
* @param privateFlags
* @param memorySpace
* @param threadObject the object associated with this thread, or NULL
* @return J9VMThread *
*/
J9VMThread *
allocateVMThread(J9JavaVM *vm, omrthread_t osThread, UDATA privateFlags, void *memorySpace, J9Object *threadObject);


/**
* @brief
* @param currentThread
* @param threadObject
* @return j9object_t
*/
j9object_t
createCachedOutOfMemoryError(J9VMThread * currentThread, j9object_t threadObject);


/**
* @brief
* @param vm
* @return J9VMThread*
*/
J9VMThread*
currentVMThread(J9JavaVM * vm);

/**
 * @brief
 * @param currentThread
 * @param pDeadlockedThreads
 * @param pBlockingObjects
 * @param flags
 * @return IDATA
 */
IDATA
findObjectDeadlockedThreads(J9VMThread *currentThread, j9object_t **pDeadlockedThreads, j9object_t **pBlockingObjects,
	UDATA flags);

#define J9VMTHREAD_FINDDEADLOCKFLAG_ALREADYHAVEEXCLUSIVE	0x1
#define J9VMTHREAD_FINDDEADLOCKFLAG_INCLUDESYNCHRONIZERS	0x2
#define J9VMTHREAD_FINDDEADLOCKFLAG_INCLUDEWAITING			0x4

/**
* @brief
* @param *entryarg
* @return IDATA J9THREAD_PROC
*/
IDATA J9THREAD_PROC
javaThreadProc(void *entryarg);


/**
* @brief
* @param *vm
* @param *self
* @param *toFile
*/
void
printThreadInfo(J9JavaVM *vm, J9VMThread *self, char *toFile, BOOLEAN allThreads);


/**
* @brief
* @param currentThread
* @param threadObject
* @param privateFlags
* @param osStackSize
* @param priority
* @param entryPoint
* @param entryArg
* @param schedulingParameters
* @return UDATA
*/
UDATA
startJavaThread(J9VMThread * currentThread, j9object_t threadObject, UDATA privateFlags,
	UDATA osStackSize, UDATA priority, omrthread_entrypoint_t entryPoint, void * entryArg, j9object_t schedulingParameters);


/**
* @brief
* @param vmThread
* @param forkedByVM
*/
void
threadCleanup(J9VMThread * vmThread, UDATA forkedByVM);


/**
* @brief
* @param vm
*/
void OMRNORETURN
exitJavaThread(J9JavaVM * vm);


/**
 * @brief
 * @param vm
 * @param optArg
 * @return jint
 */
jint
threadParseArguments(J9JavaVM *vm, char *optArg);

/**
 * @brief Returns the Java priority for the thread specified. For RealtimeThreads, the priority
 * comes from the priority field in PriorityParameters while for regular threads or any thread
 * in a non-realtime vm it comes from the priority field in Thread. Callers of this method must
 * ensure that the Java Thread object for the thread is not NULL and that this cannot change
 * while the call is being made. This method should also only be called when we don't need barrier
 * checks such as call from jvmti and ras.
 *
 * @param vm the vm used to lookup the priority
 * @param thread the thread for which the priority should be returned
 * @return UDATA
 */
UDATA
getJavaThreadPriority(struct J9JavaVM *vm, J9VMThread* thread );

#if JAVA_SPEC_VERSION >= 19
/* ---------------- ContinuationHelpers.cpp ---------------- */

/**
 * @brief Enters the Continuation runnable.
 * If the Continuation has not started, start the runnable task via callin to interpreter on the method Continuation.execute.
 * If the Continuation has already started, resume the execution with a new interpreter instance on the stack.
 *
 * @param currentThread the thread to mount Continuation.
 * @param continuationObject
 * @return BOOLEAN
 */
BOOLEAN
enterContinuation(struct J9VMThread *currentThread, j9object_t continuationObject);

/**
 * @brief Suspends the Continuation runnable.
 *
 * @param currentThread the thread whose Continuation is being yielded
 * @param isFinished true if it is last unmount
 * @param returnState thread execution state when it is re-mounted
 * @return BOOLEAN
 */
BOOLEAN
yieldContinuation(struct J9VMThread *currentThread, BOOLEAN isFinished, UDATA returnState);

/**
 * @brief Free the native memory allocated by Continuation.
 *
 * @param currentThread the thread unmounting Continuation
 * @param continuationObject
 * @param skipLocalCache skip trying to store as local cache
 */
void
freeContinuation(J9VMThread *currentThread, j9object_t continuationObject, BOOLEAN skipLocalCache);

/**
 * @brief Recycle the native memory allocated by Continuation.
 *
 * @param vm
 * @param vmThread the thread unmounting Continuation
 * @param continuationObject
 * @param skipLocalCache skip trying to store as local cache
 */
void
recycleContinuation(J9JavaVM *vm, J9VMThread *vmThread, J9VMContinuation *continuation, BOOLEAN skipLocalCache);

/**
 * @brief Determine if the current continuation is pinned.
 *
 * @param currentThread
 * @return 0 if not pinned; otherwise, an error code corresponding to the pinned reason
 */
jint
isPinnedContinuation(J9VMThread *currentThread);

/**
 * @brief Copy data from Continuation struct to vmThread.
 *
 * @param currentThread
 * @param allocated J9VMThread pointer
 * @param allocated J9VMEntryLocalStorage pointer
 * @param continuation struct
 */
void
copyFieldsFromContinuation(J9VMThread *currentThread, J9VMThread *vmThread, J9VMEntryLocalStorage *els, J9VMContinuation *continuation);

/**
 * @brief Walk the stackframes associated with a continuation.
 *
 * @param currentThread current thread
 * @param continuation the continuation to be walked
 * @param threadObject the thread object whose state is stored in the continuation
 * @return 0 on success and non-zero on failure
 */
UDATA
walkContinuationStackFrames(J9VMThread *currentThread, J9VMContinuation *continuation, j9object_t threadObject, J9StackWalkState *walkState);

/**
 * @brief Walk all stackframes in the VM.
 *
 * @param currentThread
 * @param walkState walkstate holding initial walk parameters to be used in each stackwalk
 * @return 0 on success and non-zero on failure
 */
UDATA
walkAllStackFrames(J9VMThread *currentThread, J9StackWalkState *walkState);

/**
 * @brief Acquire inspector access on VirtualThread, block until access is acquired.
 *
 * @param currentThread
 * @param thread target VirtualThread to acquire the inspector on
 * @param spin call should spin until sucessfully acquired access
 * @return TRUE on success, FALSE on failure
 */
BOOLEAN
acquireVThreadInspector(J9VMThread *currentThread, jobject thread, BOOLEAN spin);

/**
 * @brief Release the inspector acquired from VirtualThread.
 *
 * @param currentThread
 * @param thread target VirtualThread to release the inspector on
 */
void
releaseVThreadInspector(J9VMThread *currentThread, jobject thread);

/**
 * @brief Enter VirtualThread's critical section for transitions.
 *
 * @param currentThread the current thread
 * @param thread target VirtualThread that is transitioning
 */
void
enterVThreadTransitionCritical(J9VMThread *currentThread, jobject thread);

/**
 * @brief Exit VirtualThread's critical section for transitions.
 *
 * @param currentThread the current thread
 * @param thread target VirtualThread that is transitioning
 */
void
exitVThreadTransitionCritical(J9VMThread *currentThread, jobject thread);
#endif /* JAVA_SPEC_VERSION >= 19 */

#if JAVA_SPEC_VERSION >= 24
/**
 * @brief Attach all yielded VirtualThread monitors to carrier thread.
 *
 * @param currentThread the current thread
 * @param continuationObject the Continuation object
 * @param isObjectWait if the call is from Object.wait()
 */
void
preparePinnedVirtualThreadForMount(J9VMThread *currentThread, j9object_t continuationObject, BOOLEAN isObjectWait);

/**
 * @brief Inflate all monitors and prepare the VirtualThread to yield.
 *
 * @param currentThread the current thread
 * @param syncObj object to block/wait on
 * @param isObjectWait if the call is from Object.wait()
 *
 * @return syncObj if isObjectWait is false and monitor can be acquired;
 * J9_OBJECT_MONITOR_YIELD_VIRTUAL if the virtual thread can be successfully yielded;
 * otherwise, an error code is returned
 */
UDATA
preparePinnedVirtualThreadForUnmount(J9VMThread *currentThread, j9object_t syncObj, BOOLEAN isObjectWait);

/**
 * @brief Find a list of virtual thread to be unblocked. This is a helper method for
 * JVM_TakeVirtualThreadListToUnblock (see javanextvmi.cpp).
 *
 * @param currentThread the current thread
 *
 * @return a list of virtual threads to be unblocked
 */
jobject
takeVirtualThreadListToUnblock(J9VMThread *currentThread);

/**
 * @brief Inflate and detach the monitor for current vthread.
 *
 * @param currentThread the current thread
 * @param lockObject the object with monitor to detach
 * @param alreadyDetached whether object monitor has already been detached
 *
 * @return the inflated J9ObjectMonitor pointer
 */
J9ObjectMonitor *
detachMonitorInfo(J9VMThread *currentThread, j9object_t lockObject, BOOLEAN *alreadyDetached);
#endif /* JAVA_SPEC_VERSION >= 24 */
/* ---------------- hookableAsync.c ---------------- */

/**
* @brief Register a new async event handler.
* @param vm
* @param eventHandler
* @param userData
* @return IDATA
*
* Returns a non-negative handler key on success, or a negative number upon failure.
*/
IDATA
J9RegisterAsyncEvent(J9JavaVM * vm, J9AsyncEventHandler eventHandler, void * userData);

/**
* @brief Unregister an async event handler.
* @param vm
* @param handlerKey
* @return IDATA
*
* Returns 0 on success, non-zero on failure.
*/
IDATA
J9UnregisterAsyncEvent(J9JavaVM * vm, IDATA handlerKey);

/**
* @brief Signal an async event on a specific thread, or all threads if targetThread is NULL.
* @param vm
* @param targetThread
* @param handlerKey
* @return IDATA
*
* Returns 0 on success, non-zero on failure.
*/
IDATA
J9SignalAsyncEvent(J9JavaVM * vm, J9VMThread * targetThread, IDATA handlerKey);

/**
* @brief Signal an async event on a specific thread, or all threads if targetThread is NULL.
* @param vm
* @param targetThread
* @param handlerKey
* @return IDATA
*
* Returns 0 on success, non-zero on failure.
*/
IDATA
J9SignalAsyncEventWithoutInterrupt(J9JavaVM * vm, J9VMThread * targetThread, IDATA handlerKey);

/**
* @brief Cancel an async event on a specific thread, or all threads if targetThread is NULL.
* @param vm
* @param targetThread
* @param handlerKey
* @return IDATA
*
* Returns 0 on success, non-zero on failure.
*/
IDATA
J9CancelAsyncEvent(J9JavaVM * vm, J9VMThread * targetThread, IDATA handlerKey);

/**
* @brief Called from the async message handler once the async event flags have been fetched and zeroed.
* @param currentThread
* @param asyncEventFlags
*/
void
dispatchAsyncEvents(J9VMThread * currentThread, UDATA asyncEventFlags);

/* ---------------- findmethod.c ---------------- */

/**
* @brief Find the rom class in the segment that matches the PC.
* @param vmThread
* @param memorySegment
* @param methodPC
* @return J9ROMClass
*
* Returns the romclass, or NULL on failure.
*/
J9ROMClass *
	findROMClassInSegment(J9VMThread *vmThread, J9MemorySegment *memorySegment, UDATA methodPC);

/**
* @brief Find the ROM method for the PC in a given ROM class.
* @param vmThread
* @param romClass
* @param methodPC
* @return J9ROMMethod
*
* Returns the method, or NULL on failure.
*/
J9ROMMethod *
	findROMMethodInROMClass(J9VMThread *vmThread, J9ROMClass *romClass, UDATA methodPC);

/**
* @brief Finds the rom class given a PC.  Also returns the classloader it belongs to.
* @param vmThread
* @param methodPC
* @param resultClassLoader  This is the classLoader that owns the memory segment that the ROMClass was found in.
*	For classes from the SharedClasses cache, this will always be the vm->systemClassLoader regardless of which
*	J9ClassLoader actually loaded the class.
* @return IDATA
*
* Returns the rom class, or NULL on failure.  resultClassLoader is filled in if non-null with the classloader associated.
*/
J9ROMClass *
	findROMClassFromPC(J9VMThread *vmThread, UDATA methodPC, J9ClassLoader **resultClassLoader);

/* ---------------- ownedmonitors.c ---------------- */
typedef struct J9ObjectMonitorInfo {
	j9object_t object;
	IDATA depth;
	UDATA count;
} J9ObjectMonitorInfo;

/**
 * @brief See if an object is being waited on by targetThread
 * @param currentThread
 * @param targetThread
 * @param obj
 * @return BOOLEAN
 */
BOOLEAN
objectIsBeingWaitedOn(J9VMThread *currentThread, J9VMThread *targetThread, j9object_t obj);

/**
 * @brief Get the object monitors locked by a thread
 * @param currentThread
 * @param targetThread
 * @param info
 * @param infoLen
 * @param reportErrors
 * @return IDATA
 */
IDATA
getOwnedObjectMonitors(J9VMThread *currentThread, J9VMThread *targetThread,
		J9ObjectMonitorInfo *info, IDATA infoLen, BOOLEAN reportErrors);

/**
 * @brief Construct a UTF8 illegalAccess message.
 *
 * @param[in] currentThread
 * @param[in] badMemberModifier
 * @param[in] senderClass
 * @param[in] targetClass
 * @param[in] errorType
 * @return char *
 */
char *
illegalAccessMessage(J9VMThread *currentThread, IDATA badMemberModifier, J9Class *senderClass, J9Class *targetClass, IDATA errorType);


/* ---------------- vtable.c ---------------- */

/**
 * @brief
 * @param vmStruct
 * @param vTableWriteCursor
 * @param currentMethod
 */
void
fillJITVTableSlot(J9VMThread *vmStruct, UDATA *currentSlot, J9Method *currentMethod);

/**
 * @brief
 * @param method
 * @param clazz
 * @param vmThread
 * @return UDATA
 */
UDATA
getVTableOffsetForMethod(J9Method * method, J9Class *clazz, J9VMThread *vmThread);

j9object_t
resolveMethodTypeRef(J9VMThread *vmThread, J9ConstantPool *constantPool, UDATA cpIndex, UDATA resolveFlags);

j9object_t
resolveMethodHandleRef(J9VMThread *vmThread, J9ConstantPool *constantPool, UDATA cpIndex, UDATA resolveFlags);

/* ---------------- logsupport.c ---------------- */

UDATA
queryLogOptions (J9JavaVM *vm, I_32 buffer_size, void *options, I_32 *data_size);

UDATA
setLogOptions (J9JavaVM *vm, char *options);

/* -------------------- NativeHelpers.cpp ------------ */

#if defined(J9VM_OPT_METHOD_HANDLE)
/**
* @brief
* @param currentThread
* @param methodType
* @return J9SFMethodTypeFrame The frame
*/
J9SFMethodTypeFrame *
buildMethodTypeFrame(J9VMThread * currentThread, j9object_t methodType);
#endif /* defined(J9VM_OPT_METHOD_HANDLE) */

/* -------------------- drophelp.c ------------ */

/**
* @brief Set the SP to the unwindSP (as if we had stack walked) of the current frame.
* Keep literals consistent with that.
* @param currentThread
* @return UDATA TRUE or FALSE - is this a bytecoded frame (i.e. can't push on top of it)?
*/
UDATA
dropPendingSendPushes(J9VMThread *currentThread);

/**
* @brief Prepare the current stack for throwing an exception (clear all pending, build necessary frames)
* @param currentThread
*/
void
prepareForExceptionThrow(J9VMThread *currentThread);

/**
 * Create a Java virtual machine
 * @param p_vm pointer to pointer to Java VM
 * @param p_env pointer to environment
 * @param createParams ully-resolved VM arguments, plus metadata, portLibrary, flags etc.
 *
 */
jint JNICALL J9_CreateJavaVM(JavaVM ** p_vm, void ** p_env, J9CreateJavaVMParams *createParams);
jint JNICALL J9_GetCreatedJavaVMs(JavaVM ** vm_buf, jsize bufLen, jsize * nVMs);
jint JNICALL J9_GetDefaultJavaVMInitArgs(void *);

/*
 * Used with J9_GetInterface() to specify which function table to return.
 */
typedef enum {
	IF_ZIPSUP
} J9_INTERFACE_SELECTOR;

/**
 * Returns an internal VM interface.
 * @param interfaceSelector select which interface to return
 * @param portLib port library
 * @param userData additional information required by the specific interface.
 * @return  function table
 */
void*
J9_GetInterface(J9_INTERFACE_SELECTOR interfaceSelector, J9PortLibrary* portLib, void *userData);

/* -------------------- ClassInitialization.cpp ------------ */

/**
 * Enter the monitor for initializationLock, checking for immediate async and handling out of memory.
 *
 * @param[in] *currentThread current thread
 * @param[in] initializationLock the initialization lock object
 *
 * @return initialization lock object (possibly relocated), or NULL if an immediate async or OOM occurred
 */
j9object_t
enterInitializationLock(J9VMThread *currentThread, j9object_t initializationLock);

/**
 * Run the <clinit> for a class.
 *
 * @param[in] *currentThread current thread
 * @param[in] *j9clazz the J9Class to <clinit>
 */
void
initializeImpl(J9VMThread *currentThread, J9Class *j9clazz);

/**
 * Prepare a J9Class.
 *
 * @param[in] *currentThread current thread
 * @param[in] *clazz the J9Class to prepare
 */
void
prepareClass(J9VMThread *currentThread, J9Class *clazz);

/**
 * Initialize a J9Class.
 *
 * @param[in] *currentThread current thread
 * @param[in] *clazz the J9Class to initialize
*/
void
initializeClass(J9VMThread *currentThread, J9Class *clazz);

/* -------------------- threadpark.cpp ------------ */

/**
 * @param[in] vmThread the current thread
 * @param[in] timeoutIsEpochRelative is the timeout in milliseconds relative to the beginning of the epoch
 * @param[in] timeout nanosecond or millisecond timeout
 */
void
threadParkImpl(J9VMThread *vmThread, BOOLEAN timeoutIsEpochRelative, I_64 timeout);
void
threadUnparkImpl (J9VMThread* vmThread, j9object_t threadObject);
J9Class*
getThreadParkClassObject(J9VMThread *vmThread);
UDATA
getThreadParkClassIterator(J9VMThread *vmThread, J9StackWalkState *walkState);

/* -------------------- threadhelp.cpp ------------ */

/**
 * A time compensation helper for Object.wait(), Thread.sleep(), and Unsafe.park().
 * No time compensation for these APIs if CRIU is disabled.
 *
 * @param[in] vmThread the current thread
 * @param[in] threadHelperType the helper type
 *            HELPER_TYPE_MONITOR_WAIT_INTERRUPTABLE - omrthread_monitor_wait_interruptable
 *            HELPER_TYPE_MONITOR_WAIT_TIMED         - omrthread_monitor_wait_timed
 *            HELPER_TYPE_THREAD_PARK                - omrthread_park
 *            HELPER_TYPE_THREAD_SLEEP               - omrthread_sleep_interruptable
 * @param[in] monitor the object monitor waiting on
 * @param[in] millis milliseconds timeout
 * @param[in] nanos nanosecond timeout
 */
IDATA
timeCompensationHelper(J9VMThread *vmThread, U_8 threadHelperType, omrthread_monitor_t monitor, I_64 millis, I_32 nanos);

/**
 * @param[in] vmThread current thread
 * @param[in] object the object to wait on
 * @param[in] millis millisecond timeout
 * @param[in] nanos nanosecond timeout
 * @param[in] interruptable set to FALSE to ignore interrupts
 *
 * @return 0 on success, non-zero on failure. This function always sets the current exception on failure.
 */
IDATA
monitorWaitImpl(J9VMThread *vmThread, j9object_t object, I_64 millis, I_32 nanos, BOOLEAN interruptable);

/**
 * @param[in] vmThread current thread
 * @param[in] millis millisecond timeout
 * @param[in] nanos nanosecond timeout
 *
 * @return 0 on success, non-zero on failure. This function always sets the current exception on failure.
 */
IDATA
threadSleepImpl(J9VMThread *vmThread, I_64 millis, I_32 nanos);

omrthread_monitor_t
getMonitorForWait (J9VMThread* vmThread, j9object_t object);
/**
 * Helper function to create a thread with a specific thread category.
 *
 * @param[out] handle a pointer to a omrthread_t which will point to the thread (if successfully created)
 * @param[in] stacksize the size of the new thread's stack (bytes)<br>
 *			0 indicates use default size
 * @param[in] priority priorities range from J9THREAD_PRIORITY_MIN to J9THREAD_PRIORITY_MAX (inclusive)
 * @param[in] suspend set to non-zero to create the thread in a suspended state.
 * @param[in] entrypoint pointer to the function which the thread will run
 * @param[in] entryarg a value to pass to the entrypoint function
 * @param[in] category category of the thread to be created
 *
 * @return success or error code
 * @retval J9THREAD_SUCCESS success
 * @retval J9THREAD_ERR_xxx failure
 *
 * @see omrthread_create
 */
IDATA
createThreadWithCategory(omrthread_t* handle, UDATA stacksize, UDATA priority, UDATA suspend,
	omrthread_entrypoint_t entrypoint, void* entryarg, U_32 category);

/**
 * Helper function to create a joinable thread with a specific thread category.
 *
 * @param[out] handle a pointer to a omrthread_t which will point to the thread (if successfully created)
 * @param[in] stacksize the size of the new thread's stack (bytes)<br>
 *			0 indicates use default size
 * @param[in] priority priorities range from J9THREAD_PRIORITY_MIN to J9THREAD_PRIORITY_MAX (inclusive)
 * @param[in] suspend set to non-zero to create the thread in a suspended state.
 * @param[in] entrypoint pointer to the function which the thread will run
 * @param[in] entryarg a value to pass to the entrypoint function
 * @param[in] category category of the thread to be created
 *
 * @return success or error code
 * @retval J9THREAD_SUCCESS success
 * @retval J9THREAD_ERR_xxx failure
 *
 * @see omrthread_create
 */
IDATA
createJoinableThreadWithCategory(omrthread_t* handle, UDATA stacksize, UDATA priority, UDATA suspend,
	omrthread_entrypoint_t entrypoint, void* entryarg, U_32 category);

/**
 * Helper function to attach a thread with a specific category.
 *
 * If the OS thread is already attached, handle is set to point to the existing omrthread_t.
 *
 * @param[out] handle a pointer to a omrthread_t which will point to the thread (if successfully attached)
 * @param[in]  category thread category
 *
 * @return success or error code
 * @retval J9THREAD_SUCCESS success
 * @retval J9THREAD_ERR_xxx failure
 *
 * @see omrthread_attach
 */
IDATA
attachThreadWithCategory(omrthread_t* handle, U_32 category);

#if JAVA_SPEC_VERSION >= 19
/**
 * Frees a thread object's TLS array.
 *
 * @param[in] currentThread the current thread
 * @param[in] threadObj the thread object to free TLS from
 */
void
freeTLS(J9VMThread *currentThread, j9object_t threadObj);
#endif /* JAVA_SPEC_VERSION >= 19 */

/**
 * Get the target J9VMThread given a j.l.Thread
 *
 * @param[in] currentThread the current thread
 * @param[in] thread the j.l.Thread
 * @paarm[in] vThreadError the error code to return if a virtual thread is not allowed to get the J9VMThread
 * @param[in] flags J9JVMTI_GETVMTHREAD_XX flags
 * @param[out] J9VMThread the J9VMThread corresponding to the j.l.Thread
 * @param[out] isVirtualThread Whether it is a virtual thread
 * @param[out] isThreadAlive Whether the thread is alive
 *
 * @return jvmtiError
 */
jvmtiError
getTargetVMThreadHelper(J9VMThread *currentThread, jthread thread, jvmtiError vThreadError, UDATA flags, J9VMThread **vmThreadPtr, BOOLEAN* isVirtualThread, BOOLEAN *isThreadAlive);

/**
 * Release the target J9VMThread retuned from getTargetVMThreadHelper()
 *
 * @param[in] currentThread the current thread
 * @param[in] targetThread the J9VMThread retuned from getTargetVMThreadHelper()
 * @param[in] thread the j.l.Thread corresponding to the targetThread
 */
void
releaseTargetVMThreadHelper(J9VMThread *currentThread, J9VMThread *targetThread, jthread thread);


/* -------------------- J9OMRHelpers.cpp ------------ */

/**
 * Initialize an OMR VMThread.
 *
 * @param[in] *vm the J9JavaVM
 * @param[in] *vmThread the J9VMThread where the OMR VMThread is allocated.
 * @return a JNI error code
 */
jint initOMRVMThread(J9JavaVM *vm, J9VMThread *vmThread);

/**
 * Destroy an OMR VMThread.
 *
 * @param[in] *vm the J9JavaVM
 * @param[in] *vmThread the J9VMThread where the OMR VMThread is allocated.
 */
void destroyOMRVMThread(J9JavaVM *vm, J9VMThread *vmThread);

/**
 * Attach a J9VMThread to OMR.
 *
 * @param[in] *vm the J9JavaVM
 * @param[in] *vmThread the J9VMThread
 * @param[in] osThread the omrthread_t associated with the J9VMThread
 *
 * @return a JNI error code
 */
jint
attachVMThreadToOMR(J9JavaVM *vm, J9VMThread *vmThread, omrthread_t osThread);

/**
 * Detach a J9VMThread from OMR.
 *
 * @param[in] *vm the J9JavaVM
 * @param[in] *vmThread the J9VMThread
 */
void
detachVMThreadFromOMR(J9JavaVM *vm, J9VMThread *vmThread);

/**
 * Allocate a J9JavaVM followed by the OMR runtime and VM structures.
 *
 * @param[in] *portLibrary the port library
 *
 * @return newly-allocated J9JavaVM, or NULL on failure
 */
J9JavaVM *
allocateJavaVMWithOMR(J9PortLibrary *portLibrary);

/**
 * Attach the J9JavaVM to OMR.
 *
 * @param[in] *vm the J9JavaVM
 *
 * @return a JNI error code
 */
jint
attachVMToOMR(J9JavaVM *vm);

/**
 * Detach the J9JavaVM from OMR.
 *
 * @param[in] *vm the J9JavaVM
 */
void
detachVMFromOMR(J9JavaVM *vm);



/* ------------------- callin.cpp ----------------- */

/**
 * Convert and push arguments for a reflect method/constructor invocation.
 *
 * @param currentThread[in] the current J9VMThread
 * @param parameterTypes[in] the array of parameter types
 * @param arguments[in] the array of arguments
 *
 * @returns 0 on success, 1 for invalid argument count, 2 for illegal argument
 */
UDATA
pushReflectArguments(J9VMThread *currentThread, j9object_t parameterTypes, j9object_t arguments);

#if JAVA_SPEC_VERSION >= 19
/**
 * Pop off the Callin frame from stack and update thread states.
 *
 * @param currentThread
 */
void
restoreCallInFrame(J9VMThread *currentThread);
#endif /* JAVA_SPEC_VERSION >= 19 */

/* Thread library API accessible via GetEnv() */
#define J9THREAD_VERSION_1_1 0x7C010001

typedef struct J9ThreadEnv {
	uintptr_t 		(* get_priority)(omrthread_t thread);
	intptr_t 		(* set_priority)(omrthread_t thread, uintptr_t priority);

	omrthread_t 	(* self)(void);
	uintptr_t 		*(* global)(char *name);
	intptr_t 		(* attach)(omrthread_t *handle);
	intptr_t 		(* sleep)(int64_t millis);
	intptr_t 		(* create)(omrthread_t *handle, uintptr_t stacksize, uintptr_t priority, uintptr_t suspend, omrthread_entrypoint_t entrypoint, void *entryarg);
	void 		(* exit)(omrthread_monitor_t monitor);
	void 		(* abort)(omrthread_t handle);

	void 		(* priority_interrupt)(omrthread_t thread);
	uintptr_t		(* clear_interrupted)(void);

	intptr_t 		(* monitor_enter)(omrthread_monitor_t monitor);
	intptr_t 		(* monitor_exit)(omrthread_monitor_t monitor);
	intptr_t 		(* monitor_init_with_name)(omrthread_monitor_t *handle, uintptr_t flags, const char *name);
	intptr_t 		(* monitor_destroy)(omrthread_monitor_t monitor);
	intptr_t 		(* monitor_wait)(omrthread_monitor_t monitor);
	intptr_t 		(* monitor_notify_all)(omrthread_monitor_t monitor);

	void 		*(* tls_get)(omrthread_t thread, omrthread_tls_key_t key);
	intptr_t 		(* tls_set)(omrthread_t thread, omrthread_tls_key_t key, void *value);
	intptr_t 		(* tls_alloc)(omrthread_tls_key_t *handle);
	intptr_t 		(* tls_free)(omrthread_tls_key_t handle);

} J9ThreadEnv;


/* FlushProcessWriteBuffers.cpp */

void flushProcessWriteBuffers(J9JavaVM *vm);

/* throwexception.c */
void
throwNativeOOMError(JNIEnv *env, U_32 moduleName, U_32 messageNumber);
void
throwNewJavaIoIOException(JNIEnv *env, const char *message);

#if defined(J9VM_OPT_SNAPSHOTS)
/* VMSnapshotImpl C wrappers */

/**
 * Create and allocate a VMSnapshotImpl instance and its heap.
 *
 * @param portLibrary[in] pointer to the J9PortLibrary
 * @param isSnapshotRun[in] specifies whether it is a snapshot or restore run
 * @param vmSnapshotFilePath[in] global pointer for the vmSnapshotFilePath
 *
 * @return a pointer to the created VMSnapshotImpl instance
 */
void *
createVMSnapshotImpl(J9PortLibrary *portLibrary, BOOLEAN isSnapshotRun, const char *vmSnapshotFilePath);

/**
 * Finish initializing a VMSnapshotImpl instance. Namely setting up state that
 * requires the J9JavaVM to be allocated or restored.
 *
 * @param snapshotImpl[in] pointer to a VMSnapshotImpl instance
 * @param vm[in] pointer to J9JavaVM
 * @param isSnapshotRun[in] specifies if snapshot creation is pending
 *
 * @return FALSE on fail, TRUE otherwise
 */
BOOLEAN
postInitializeVMSnapshotImpl(void *snapshotImpl, J9JavaVM *vm, BOOLEAN isSnapshotRun);

/**
 * Retrieve the J9JavaVM instance from the JVM snapshot.
 *
 * @param snapshotImpl[in] pointer to a VMSnapshotImpl instance
 * @return pointer to J9JavaVM
 */
J9JavaVM *
getJ9JavaVMFromVMSnapshotImpl(void *snapshotImpl);

/**
 * Retrieve the VMSnapshotImplPortLibrary instance from the JVM snapshot.
 *
 * @param snapshotImpl[in] pointer to a VMSnapshotImpl instance
 * @return a pointer to the VMSnapshotImplPortLibrary
 */
VMSnapshotImplPortLibrary *
getPortLibraryFromVMSnapshotImpl(void *snapshotImpl);

/**
 * Initializes the class object. This mimics the behaviour of internalCreateRAMClass.
 *
 * @param javaVM[in] pointer to J9JavaVM
 * @param classLoader the class loader loading the class
 * @param clazz the class being loader
 *
 * @return the class object if object allocation passes, otherwise NULL
 */
J9Class *
initializeSnapshotClassObject(J9JavaVM *javaVM, J9ClassLoader *classLoader, J9Class *clazz);

/**
 * Initializes a class loader object. This mimics the behaviour of internalAllocateClassLoader.
 *
 * @param javaVM[in] pointer to J9JavaVM
 * @param classLoader[in] the J9ClassLoader struct
 * @param classLoaderObject[in] unwrapped class loader object ref
 */
void
initializeSnapshotClassLoaderObject(J9JavaVM *javaVM, J9ClassLoader *classLoader, j9object_t classLoaderObject);

/**
 * Shut down sequence of VMSnapshotImpl. Free memory of the heap variables and the VMSnapshotImpl
 * instance.
 *
 * @param vmSnapshotImplPortLibrary[in] pointer to the vmSnapshotImplPortLibrary
 */
void
shutdownVMSnapshotImpl(VMSnapshotImplPortLibrary *vmSnapshotImplPortLibrary);

/**
 * Perform fixup of the snapshot heap memory during the snpashot run. Fixup of J9Class, J9ClassLoader,
 * and J9CPEntry performed. Also, write the JVM state to the snapshot.
 *
 * @param javaVM[in] pointer to J9JavaVM
 */
void
teardownVMSnapshotImpl(J9JavaVM *javaVM);

/**
 * Stores the JavaVM initial methods in the snapshot header during snapshot runs.
 *
 * @param javaVM[in] pointer to J9JavaVM
 * @param cInitialStaticMethod[in] the initial static method
 * @param cInitialSpecialMethod[in] the initial special method
 * @param cInitialVirtualMethod[in] the initial virtual method
 */
void
storeInitialVMMethods(J9JavaVM *javaVM, J9Method *cInitialStaticMethod, J9Method *cInitialSpecialMethod, J9Method *cInitialVirtualMethod);

/**
 * Sets JavaVM initial methods to addresses stored in the snapshot header
 * during restore runs.
 *
 * @param javaVM[in] pointer to J9JavaVM
 * @param cInitialStaticMethod[in] the initial static method
 * @param cInitialSpecialMethod[in] the initial special method
 * @param cInitialVirtualMethod[in] the initial virtual method
 */
void
setInitialVMMethods(J9JavaVM *javaVM, J9Method **cInitialStaticMethod, J9Method **cInitialSpecialMethod, J9Method **cInitialVirtualMethod);

/**
 * Run class load hooks and assign class object to J9Class.
 *
 * @param vmThread[in] the current VM thread
 * @param classLoader[in] classloader of the J9Class
 * @param clazz[in] J9Class to be loaded
 */
BOOLEAN
loadWarmClassFromSnapshot(J9VMThread *vmThread, J9ClassLoader *classLoader, J9Class *clazz);

/**
 * Perform post-snapshot fixups on the provided J9Class.
 *
 * @param javaVM[in] pointer to J9JavaVM
 * @param clazz[in] J9Class to be initialized
 */
void
initializeSnapshotJ9Class(J9JavaVM *javaVM, J9Class *clazz);

/**
 * Perform initialization of base classes.
 *
 * @param javaVM[in] pointer to J9JavaVM
 */
void
initializeBaseClasses(J9JavaVM *javaVM);
#endif /* defined(J9VM_OPT_SNAPSHOTS) */

/**
 * Iterate over a class segment.
 *
 * @param nextClass[in/out] pointer to pointer to J9Class
 * @return a pointer to the next class or NULL
 */
J9Class *
segmentIteratorNextClass(J9Class **nextClass);

#if JAVA_SPEC_VERSION >= 16

/* ------------------- UpcallThunkGen.cpp ----------------- */

/**
 * @brief Generate the appropriate thunk/adaptor for a given J9UpcallMetaData.
 *
 * @param metaData[in/out] a pointer to the given J9UpcallMetaData
 * @return the address for this future upcall function handle, either the thunk or the thunk-descriptor
 */
void *
createUpcallThunk(J9UpcallMetaData *data);

/**
 * @brief Calculate the requested argument in-stack memory address to return.
 *
 * @param nativeSig a pointer to the J9UpcallNativeSignature
 * @param argListPtr a pointer to the argument list prepared by the thunk
 * @param argIdx the requested argument index
 * @return the address in argument list for the requested argument
 *
 * Details:
 *   A quick walk-through of the argument list ahead of the requested one
 *   Calculating its address based on argListPtr
 */
void *
getArgPointer(J9UpcallNativeSignature *nativeSig, void *argListPtr, int argIdx);

/**
 * @brief Allocate a piece of thunk memory with a given size from the existing virtual memory block.
 *
 * @param data a pointer to J9UpcallMetaData
 * @return the start address of the upcall thunk memory, or NULL on failure.
 */
void *
allocateUpcallThunkMemory(J9UpcallMetaData *data);


/**
 * @brief Flush the generated thunk to the memory.
 *
 * @param data a pointer to J9UpcallMetaData
 * @param thunkAddress the address of the generated thunk
 */
void
doneUpcallThunkGeneration(J9UpcallMetaData *data, void *thunkAddress);

/* ------------------- UpcallVMHelpers.cpp ----------------- */

/**
 * @brief Call into the interpreter via native2InterpJavaUpcallImpl to invoke the upcall
 * specific method handle and ignore the return value in the case of void.
 *
 * @param data a pointer to J9UpcallMetaData
 * @param argsListPointer a pointer to the argument list
 */
void JNICALL
native2InterpJavaUpcall0(J9UpcallMetaData *data, void *argsListPointer);

/**
 * @brief Call into the interpreter via native2InterpJavaUpcallImpl to invoke the upcall
 * specific method handle and return an I_32 value in the case of byte/char/short/int.
 *
 * @param data a pointer to J9UpcallMetaData
 * @param argsListPointer a pointer to the argument list
 * @return an I_32 value
 */
I_32 JNICALL
native2InterpJavaUpcall1(J9UpcallMetaData *data, void *argsListPointer);

/**
 * @brief Call into the interpreter via native2InterpJavaUpcallImpl to invoke the upcall
 * specific method handle and return an I_64 value in the case of long/pointer.
 *
 * @param data a pointer to J9UpcallMetaData
 * @param argsListPointer a pointer to the argument list
 * @return an I_64 value
 */
I_64 JNICALL
native2InterpJavaUpcallJ(J9UpcallMetaData *data, void *argsListPointer);

/**
 * @brief Call into the interpreter via native2InterpJavaUpcallImpl to invoke the upcall
 * specific method handle and return a float value as specified in the return type.
 *
 * @param data a pointer to J9UpcallMetaData
 * @param argsListPointer a pointer to the argument list
 * @return a float
 */
float JNICALL
native2InterpJavaUpcallF(J9UpcallMetaData *data, void *argsListPointer);

/**
 * @brief Call into the interpreter via native2InterpJavaUpcallImpl to invoke the upcall
 * specific method handle and return a double value as specified in the return type.
 *
 * @param data a pointer to J9UpcallMetaData
 * @param argsListPointer a pointer to the argument list
 * @return a double
 */
double JNICALL
native2InterpJavaUpcallD(J9UpcallMetaData *data, void *argsListPointer);

/**
 * @brief Call into the interpreter via native2InterpJavaUpcallImpl to invoke the upcall
 * specific method handle and return a U_8 pointer to the requested struct.
 *
 * @param data a pointer to J9UpcallMetaData
 * @param argsListPointer a pointer to the argument list
 * @return a U_8 pointer
 */
U_8 * JNICALL
native2InterpJavaUpcallStruct(J9UpcallMetaData *data, void *argsListPointer);

/**
 * @brief Check if the memory's scope exists on the stack of the thread.
 *
 * @param[in] walkThread the J9VMThread to be walked
 * @param[in] scope the object searched during the walk
 *
 * @return true if scope is found, false if not
 */
BOOLEAN
hasMemoryScope(J9VMThread *walkThread, j9object_t scope);
#endif /* JAVA_SPEC_VERSION >= 16 */

/* ------------------- jfr.cpp ------------------- */

#if defined(J9VM_OPT_JFR)
/**
 * Initialize JFR.
 *
 * @param vm[in] the J9JavaVM
 * @param lateInit[in] indicate if JFR is initialized late after startup
 *
 * @returns JNI_OK on success, JNI error code on failure
 */
jint
initializeJFR(J9JavaVM *vm, BOOLEAN lateInit);

/**
 * Check if a JFR is enabled on the JVM.
 *
 * @param vm[in] the J9JavaVM
 *
 * @returns JNI_TRUE if a JFR enabled, JNI_FALSE otherwise
 */
jboolean
isJFREnabled(J9JavaVM *vm);

/**
 * Check if a JFR recording has been started.
 *
 * @param vm[in] the J9JavaVM
 *
 * @returns JNI_TRUE if a JFR recording is in progress, JNI_FALSE otherwise
 */
jboolean
isJFRRecordingStarted(J9JavaVM *vm);

/**
 * Flush all the thread buffers and write out the global buffer.
 *
 * @param currentThread[in] the current J9VMThread
 * @param finalWrite[in] indicate if this the final write
 */
void
jfrDump(J9VMThread *currentThread, BOOLEAN finalWrite);

/**
 * Take an execution sample of the current thread.
 *
 * @param currentThread[in] the current J9VMThread
 * @param sampleThread[in] the thread being walked
 */
void
jfrExecutionSample(J9VMThread *currentThread, J9VMThread *sampleThread);

/**
 * Set JFR recording file name.
 *
 * @param vm[in] the J9JavaVM
 * @param fileName[in] the file name for new JFR recording
 *
 * @returns JNI_TRUE on success, JNI_FALSE on failure
 */
jboolean
setJFRRecordingFileName(J9JavaVM *vm, char *fileName);

/**
 * Shut down JFR.
 *
 * @param vm[in] the J9JavaVM
 */
void
tearDownJFR(J9JavaVM *vm);

/**
 * Get the type ID for the JFR event type. This operation is
 * thread safe as it internally acquires a mutex. Only
 * subclasses of jdk.jfr.event.Event can be called with this
 * function, this is enforced at the JCL level.
 *
 * @param currentThread[in] the current J9VMThread
 * @param clazz JFR event class
 */
jlong
getTypeId(J9VMThread *currentThread, J9Class *clazz);

/**
 * Get the type ID for the JFR event type. This operation is
 * thread safe as it internally acquires a mutex.
 *
 * @param currentThread[in] the current J9VMThread
 * @param className name of JFR event class
 */
jlong
getTypeIdUTF8(J9VMThread *currentThread, const J9UTF8 *className);

/**
 * Initialize JFR ID structures
 *
 * @param vm[in] the J9JavaVM
 */
UDATA
initializeJFRIDs(J9JavaVM *vm);

/**
 * Shutdown JFR ID structures
 *
 * @param vm[in] the J9JavaVM
 */
void
shutdownJFRIDs(J9JavaVM *vm);

#endif /* defined(J9VM_OPT_JFR) */

#ifdef __cplusplus
} /* extern "C" */
#endif

#endif /* vm_api_h */
