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ObjectAccessBarrierAPI.hpp
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/*******************************************************************************
* Copyright (c) 1991, 2021 IBM Corp. and others
*
* 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] http://openjdk.java.net/legal/assembly-exception.html
*
* SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception
*******************************************************************************/
#if !defined(OBJECTACCESSBARRIERAPI_HPP_)
#define OBJECTACCESSBARRIERAPI_HPP_
#include "j9cfg.h"
#if defined(OMR_OVERRIDE_COMPRESS_OBJECT_REFERENCES)
#if OMR_OVERRIDE_COMPRESS_OBJECT_REFERENCES
#define MM_ObjectAccessBarrierAPI MM_ObjectAccessBarrierAPICompressed
#else /* OMR_OVERRIDE_COMPRESS_OBJECT_REFERENCES */
#define MM_ObjectAccessBarrierAPI MM_ObjectAccessBarrierAPIFull
#endif /* OMR_OVERRIDE_COMPRESS_OBJECT_REFERENCES */
#endif /* OMR_OVERRIDE_COMPRESS_OBJECT_REFERENCES */
#include "j9.h"
#include "j9modron.h"
#include "omrmodroncore.h"
#include "omr.h"
#include "AtomicSupport.hpp"
#include "ArrayCopyHelpers.hpp"
#include "j9nongenerated.h"
#define J9OAB_MIXEDOBJECT_EA(object, offset, type) (type *)(((U_8 *)(object)) + offset)
class MM_ObjectAccessBarrierAPI
{
friend class MM_ObjectAccessBarrier;
friend class MM_RealtimeAccessBarrier;
/* Data members & types */
public:
private:
const UDATA _writeBarrierType;
const UDATA _readBarrierType;
#if defined(OMR_GC_COMPRESSED_POINTERS)
const UDATA _compressedPointersShift;
#endif /* defined(OMR_GC_COMPRESSED_POINTERS) */
protected:
#if defined(OMR_GC_COMPRESSED_POINTERS) && defined(OMR_GC_FULL_POINTERS)
bool const _compressObjectReferences;
#endif /* defined(OMR_GC_COMPRESSED_POINTERS) && defined(OMR_GC_FULL_POINTERS) */
/* Methods */
public:
/**
* Create an instance.
*/
MM_ObjectAccessBarrierAPI(J9VMThread *currentThread)
: _writeBarrierType(currentThread->javaVM->gcWriteBarrierType)
, _readBarrierType(currentThread->javaVM->gcReadBarrierType)
#if defined(OMR_GC_COMPRESSED_POINTERS)
, _compressedPointersShift(currentThread->javaVM->compressedPointersShift)
#endif /* defined(OMR_GC_COMPRESSED_POINTERS) */
#if defined(OMR_GC_COMPRESSED_POINTERS) && defined(OMR_GC_FULL_POINTERS)
, _compressObjectReferences(J9VMTHREAD_COMPRESS_OBJECT_REFERENCES(currentThread))
#endif /* defined(OMR_GC_COMPRESSED_POINTERS) && defined(OMR_GC_FULL_POINTERS) */
{}
/**
* Return back true if object references are compressed
* @return true, if object references are compressed
*/
MMINLINE bool compressObjectReferences() {
#if defined(OMR_GC_COMPRESSED_POINTERS)
#if defined(OMR_GC_FULL_POINTERS)
#if defined(OMR_OVERRIDE_COMPRESS_OBJECT_REFERENCES)
return (bool)OMR_OVERRIDE_COMPRESS_OBJECT_REFERENCES;
#else /* defined(OMR_OVERRIDE_COMPRESS_OBJECT_REFERENCES) */
return _compressObjectReferences;
#endif /* defined(OMR_OVERRIDE_COMPRESS_OBJECT_REFERENCES) */
#else /* defined(OMR_GC_FULL_POINTERS) */
return true;
#endif /* defined(OMR_GC_FULL_POINTERS) */
#else /* defined(OMR_GC_COMPRESSED_POINTERS) */
return false;
#endif /* defined(OMR_GC_COMPRESSED_POINTERS) */
}
static VMINLINE void
internalPostBatchStoreObjectCardTableAndGenerational(J9VMThread *vmThread, j9object_t object)
{
/* Check to see if object is old. If object is not old neither barrier is required
* if ((object - vmThread->omrVMThread->heapBaseForBarrierRange0) < vmThread->omrVMThread->heapSizeForBarrierRange0) then old
*
* Since card dirtying also requires this calculation remember these values
*/
UDATA base = (UDATA)vmThread->omrVMThread->heapBaseForBarrierRange0;
UDATA objectDelta = (UDATA)object - base;
UDATA size = vmThread->omrVMThread->heapSizeForBarrierRange0;
if (objectDelta < size) {
/* object is old so check for concurrent barrier */
if (0 != (vmThread->privateFlags & J9_PRIVATE_FLAGS_CONCURRENT_MARK_ACTIVE)) {
/* concurrent barrier is enabled so dirty the card for object */
dirtyCard(vmThread, objectDelta);
}
/* generational barrier is required if object is old*/
rememberObject(vmThread, object);
}
}
static VMINLINE void
internalPostBatchStoreObjectGenerational(J9VMThread *vmThread, j9object_t object)
{
/* Check to see if object is old. If object is not old neither barrier is required
* if ((object - vmThread->omrVMThread->heapBaseForBarrierRange0) < vmThread->omrVMThread->heapSizeForBarrierRange0) then old
*
* Since card dirtying also requires this calculation remember these values
*/
UDATA base = (UDATA)vmThread->omrVMThread->heapBaseForBarrierRange0;
UDATA objectDelta = (UDATA)object - base;
UDATA size = vmThread->omrVMThread->heapSizeForBarrierRange0;
if (objectDelta < size) {
/* generational barrier is required if object is old*/
rememberObject(vmThread, object);
}
}
static VMINLINE void
internalPostBatchStoreObjectCardTableIncremental(J9VMThread *vmThread, j9object_t object)
{
/* Check to see if object is within the barrier range.
* if ((object - vmThread->omrVMThread->heapBaseForBarrierRange0) < vmThread->omrVMThread->heapSizeForBarrierRange0)
*
* Since card dirtying also requires this calculation remember these values
*/
UDATA base = (UDATA)vmThread->omrVMThread->heapBaseForBarrierRange0;
UDATA objectDelta = (UDATA)object - base;
UDATA size = vmThread->omrVMThread->heapSizeForBarrierRange0;
if (objectDelta < size) {
/* Object is within the barrier range. Dirty the card */
dirtyCard(vmThread, objectDelta);
}
}
static VMINLINE void
internalPostBatchStoreObjectCardTable(J9VMThread *vmThread, j9object_t object)
{
/* Check to see if object is old. If object is not old neither barrier is required
* if ((object - vmThread->omrVMThread->heapBaseForBarrierRange0) < vmThread->omrVMThread->heapSizeForBarrierRange0) then old
*
* Since card dirtying also requires this calculation remember these values
*/
UDATA base = (UDATA)vmThread->omrVMThread->heapBaseForBarrierRange0;
UDATA objectDelta = (UDATA)object - base;
UDATA size = vmThread->omrVMThread->heapSizeForBarrierRange0;
if (objectDelta < size) {
/* object is old so check for concurrent barrier */
if (0 != (vmThread->privateFlags & J9_PRIVATE_FLAGS_CONCURRENT_MARK_ACTIVE)) {
/* concurrent barrier is enabled so dirty the card for object */
dirtyCard(vmThread, objectDelta);
}
}
}
/**
* Call after storing an object reference for barrier type
* j9gc_modron_wrtbar_cardmark_and_oldcheck
*
* @param object the object being stored into
* @param value the object reference being stored
*
*/
static VMINLINE void
internalPostObjectStoreCardTableAndGenerational(J9VMThread *vmThread, j9object_t object, j9object_t value)
{
/* if value is NULL neither barrier is required */
if (NULL != value) {
/* Check to see if object is old. If object is not old neither barrier is required
* if ((object - vmThread->omrVMThread->heapBaseForBarrierRange0) < vmThread->omrVMThread->heapSizeForBarrierRange0) then old
*
* Since card dirtying also requires this calculation remember these values
*/
UDATA base = (UDATA)vmThread->omrVMThread->heapBaseForBarrierRange0;
UDATA objectDelta = (UDATA)object - base;
UDATA size = vmThread->omrVMThread->heapSizeForBarrierRange0;
if (objectDelta < size) {
/* object is old so check for concurrent barrier */
if (0 != (vmThread->privateFlags & J9_PRIVATE_FLAGS_CONCURRENT_MARK_ACTIVE)) {
/* concurrent barrier is enabled so dirty the card for object */
dirtyCard(vmThread, objectDelta);
}
/* generational barrier is required if object is old and value is new */
/* Check to see if value is new using the same optimization as above */
UDATA valueDelta = (UDATA)value - base;
if (valueDelta >= size) {
/* value is in new space so do generational barrier */
rememberObject(vmThread, object);
}
}
}
}
/**
* Call after storing an object reference for barrier type
* j9gc_modron_wrtbar_cardmark
*
* @param object the object being stored into
* @param value the object reference being stored
*
*/
static VMINLINE void
internalPostObjectStoreCardTable(J9VMThread *vmThread, j9object_t object, j9object_t value)
{
/* if value is NULL neither barrier is required */
if (NULL != value) {
/* Check to see if object is old.
* if ((object - vmThread->omrVMThread->heapBaseForBarrierRange0) < vmThread->omrVMThread->heapSizeForBarrierRange0) then old
*
* Since card dirtying also requires this calculation remember these values
*/
UDATA base = (UDATA)vmThread->omrVMThread->heapBaseForBarrierRange0;
UDATA objectDelta = (UDATA)object - base;
UDATA size = vmThread->omrVMThread->heapSizeForBarrierRange0;
if (objectDelta < size) {
/* object is old so check for concurrent barrier */
if (0 != (vmThread->privateFlags & J9_PRIVATE_FLAGS_CONCURRENT_MARK_ACTIVE)) {
/* concurrent barrier is enabled so dirty the card for object */
dirtyCard(vmThread, objectDelta);
}
}
}
}
/**
* Call after storing an object reference for barrier type
* j9gc_modron_wrtbar_cardmark_incremental
*
* @param object the object being stored into
* @param value the object reference being stored
*
*/
static VMINLINE void
internalPostObjectStoreCardTableIncremental(J9VMThread *vmThread, j9object_t object, j9object_t value)
{
/* if value is NULL neither barrier is required */
if (NULL != value) {
/* Check to see if object is within the barrier range.
* if ((object - vmThread->omrVMThread->heapBaseForBarrierRange0) < vmThread->omrVMThread->heapSizeForBarrierRange0)
*
* Since card dirtying also requires this calculation remember these values
*/
UDATA base = (UDATA)vmThread->omrVMThread->heapBaseForBarrierRange0;
UDATA objectDelta = (UDATA)object - base;
UDATA size = vmThread->omrVMThread->heapSizeForBarrierRange0;
if (objectDelta < size) {
/* Object is within the barrier range. Dirty the card */
dirtyCard(vmThread, objectDelta);
}
}
}
/**
* Call after storing an object reference for barrier type
* j9gc_modron_wrtbar_oldcheck
*
* @param object the object being stored into
* @param value the object reference being stored
*
*/
static VMINLINE void
internalPostObjectStoreGenerational(J9VMThread *vmThread, j9object_t object, j9object_t value)
{
/* if value is NULL neither barrier is required */
if (NULL != value) {
/* Check to see if object is old.
* if ((object - vmThread->omrVMThread->heapBaseForBarrierRange0) < vmThread->omrVMThread->heapSizeForBarrierRange0) then old
*
* Since card dirtying also requires this calculation remember these values
*/
UDATA base = (UDATA)vmThread->omrVMThread->heapBaseForBarrierRange0;
UDATA objectDelta = (UDATA)object - base;
UDATA size = vmThread->omrVMThread->heapSizeForBarrierRange0;
if (objectDelta < size) {
/* generational barrier is required if object is old and value is new */
/* Check to see if value is new using the same optimization as above */
UDATA valueDelta = (UDATA)value - base;
if (valueDelta >= size) {
/* value is in new space so do generational barrier */
rememberObject(vmThread, object);
}
}
}
}
/**
* Call after storing an object reference for barrier type
* j9gc_modron_wrtbar_oldcheck
*
* @param object the object being stored into
* @param value the object reference being stored
*
*/
static VMINLINE void
internalPostObjectStoreGenerationalNoValueCheck(J9VMThread *vmThread, j9object_t object)
{
/* Check to see if object is old.
* if ((object - vmThread->omrVMThread->heapBaseForBarrierRange0) < vmThread->omrVMThread->heapSizeForBarrierRange0) then old
*
* Since card dirtying also requires this calculation remember these values
*/
UDATA base = (UDATA)vmThread->omrVMThread->heapBaseForBarrierRange0;
UDATA objectDelta = (UDATA)object - base;
UDATA size = vmThread->omrVMThread->heapSizeForBarrierRange0;
if (objectDelta < size) {
rememberObject(vmThread, object);
}
}
/**
* Return the address of the lockword for the given object, or NULL if it
* does not have an inline lockword.
*/
VMINLINE j9objectmonitor_t *
getLockwordAddress(J9VMThread *currentThread, J9Object *object)
{
j9objectmonitor_t *lockwordAddress = NULL;
J9Class *clazz = J9OBJECT_CLAZZ(currentThread, object);
if (!J9_IS_J9CLASS_VALUETYPE(clazz)) {
UDATA lockOffset = clazz->lockOffset;
if ((IDATA) lockOffset >= 0) {
lockwordAddress = (j9objectmonitor_t *)(((U_8 *)object) + lockOffset);
}
}
return lockwordAddress;
}
VMINLINE void
cloneArray(J9VMThread *currentThread, j9object_t original, j9object_t copy, J9Class *objectClass, U_32 size)
{
#if defined(J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER)
currentThread->javaVM->memoryManagerFunctions->j9gc_objaccess_cloneIndexableObject(currentThread, (J9IndexableObject*)original, (J9IndexableObject*)copy);
#else /* defined(J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER) */
bool copyLockword = true;
if (OBJECT_HEADER_SHAPE_POINTERS == J9CLASS_SHAPE(objectClass)) {
VM_ArrayCopyHelpers::referenceArrayCopy(currentThread, original, 0, copy, 0, size);
} else {
VM_ArrayCopyHelpers::primitiveArrayCopy(currentThread, original, 0, copy, 0, size, (((J9ROMArrayClass*)objectClass->romClass)->arrayShape & 0x0000FFFF));
}
if (copyLockword) {
/* zero lockword, if present */
j9objectmonitor_t *lockwordAddress = getLockwordAddress(currentThread, copy);
if (NULL != lockwordAddress) {
J9_STORE_LOCKWORD(currentThread, lockwordAddress, 0);
}
}
#endif /* defined(J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER) */
}
VMINLINE UDATA
mixedObjectGetHeaderSize(J9Class *objectClass)
{
return (compressObjectReferences() ? sizeof(J9ObjectCompressed) : sizeof(J9ObjectFull)) + J9CLASS_PREPADDING_SIZE(objectClass);
}
VMINLINE UDATA
mixedObjectGetDataSize(J9Class *objectClass)
{
return J9CLASS_UNPADDED_INSTANCE_SIZE(objectClass);
}
VMINLINE void
cloneObject(J9VMThread *currentThread, j9object_t original, j9object_t copy, J9Class *objectClass)
{
UDATA offset = mixedObjectGetHeaderSize(objectClass);
copyObjectFields(currentThread, objectClass, original, offset, copy, offset);
}
VMINLINE void
copyObjectFieldsToFlattenedArrayElement(J9VMThread *vmThread, J9ArrayClass *arrayClazz, j9object_t srcObject, J9IndexableObject *arrayRef, UDATA index)
{
/* TODO optimizations for non-arraylet path will be added in the future */
vmThread->javaVM->memoryManagerFunctions->j9gc_objaccess_copyObjectFieldsToFlattenedArrayElement(vmThread, arrayClazz, srcObject, arrayRef, (I_32)index);
}
VMINLINE void
copyObjectFieldsFromFlattenedArrayElement(J9VMThread *vmThread, J9ArrayClass *arrayClazz, j9object_t destObject, J9IndexableObject *arrayRef, UDATA index)
{
/* TODO optimizations for non-arraylet path will be added in the future */
vmThread->javaVM->memoryManagerFunctions->j9gc_objaccess_copyObjectFieldsFromFlattenedArrayElement(vmThread, arrayClazz, destObject, arrayRef, (I_32)index);
}
VMINLINE BOOLEAN
structuralFlattenedCompareObjects(J9VMThread *vmThread, J9Class *valueClass, j9object_t lhsObject, j9object_t rhsObject, UDATA startOffset)
{
#if defined(J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER)
return vmThread->javaVM->memoryManagerFunctions->j9gc_objaccess_structuralCompareFlattenedObjects(vmThread, valueClass, lhsObject, rhsObject, startOffset);
#else /* defined(J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER) */
bool hasReferences = J9CLASS_HAS_REFERENCES(valueClass);
if (hasReferences && (j9gc_modron_readbar_none != _readBarrierType)) {
return vmThread->javaVM->memoryManagerFunctions->j9gc_objaccess_structuralCompareFlattenedObjects(vmThread, valueClass, lhsObject, rhsObject, startOffset);
} else {
UDATA compareSize = mixedObjectGetDataSize(valueClass);
startOffset += J9CLASS_PREPADDING_SIZE(valueClass);
return (0 == memcmp((void*)((UDATA)lhsObject + startOffset), (void*)((UDATA)rhsObject + startOffset), (size_t)compareSize));
}
#endif /* defined(J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER) */
}
/**
* Copy valueType from sourceObject to destObject
* See MM_ObjectAccessBarrier::copyObjectFields for detailed description
*
* @param vmThread vmthread token
* @param valueClass The valueType class
* @param srcObject The object being used.
* @param srcOffset The offset of the field.
* @param destObject The object being used.
* @param destOffset The offset of the field.
*/
VMINLINE void
copyObjectFields(J9VMThread *vmThread, J9Class *objectClass, j9object_t srcObject, UDATA srcOffset, j9object_t destObject, UDATA destOffset)
{
#if defined(J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER)
vmThread->javaVM->memoryManagerFunctions->j9gc_objaccess_copyObjectFields(vmThread, objectClass, srcObject, srcOffset, destObject, destOffset);
#else /* defined(J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER) */
bool hasReferences = J9CLASS_HAS_REFERENCES(objectClass);
if (hasReferences && ((j9gc_modron_readbar_none != _readBarrierType) || (j9gc_modron_wrtbar_always == _writeBarrierType))) {
vmThread->javaVM->memoryManagerFunctions->j9gc_objaccess_copyObjectFields(vmThread, objectClass, srcObject, srcOffset, destObject, destOffset);
} else {
UDATA offset = 0;
UDATA limit = mixedObjectGetDataSize(objectClass);
if (J9VMTHREAD_COMPRESS_OBJECT_REFERENCES(vmThread)) {
while (offset < limit) {
*(uint32_t*)((UDATA)destObject + offset + destOffset) = *(uint32_t*)((UDATA)srcObject + offset + srcOffset);
offset += sizeof(uint32_t);
}
} else {
while (offset < limit) {
*(uintptr_t*)((UDATA)destObject + offset + destOffset) = *(uintptr_t*)((UDATA)srcObject + offset + srcOffset);
offset += sizeof(uintptr_t);
}
}
/* zero lockword, if present */
j9objectmonitor_t *lockwordAddress = getLockwordAddress(vmThread, destObject);
if (NULL != lockwordAddress) {
J9_STORE_LOCKWORD(vmThread, lockwordAddress, 0);
}
if (hasReferences) {
postBatchStoreObject(vmThread, destObject);
}
}
#endif /* defined(J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER) */
}
/**
* Read an object field: perform any pre-use barriers, calculate an effective address
* and perform the work.
*
* @param srcObject The object being used.
* @param srcOffset The offset of the field.
* @param isVolatile non-zero if the field is volatile.
* @return result The object stored at srcOffset in srcObject
*/
VMINLINE j9object_t
inlineMixedObjectReadObject(J9VMThread *vmThread, j9object_t srcObject, UDATA srcOffset, bool isVolatile = false)
{
#if defined(J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER)
return vmThread->javaVM->memoryManagerFunctions->j9gc_objaccess_mixedObjectReadObject(vmThread, srcObject, srcOffset, isVolatile);
#elif defined(J9VM_GC_COMBINATION_SPEC)
fj9object_t *actualAddress = J9OAB_MIXEDOBJECT_EA(srcObject, srcOffset, fj9object_t);
preMixedObjectReadObject(vmThread, srcObject, actualAddress);
protectIfVolatileBefore(isVolatile, true);
j9object_t result = readObjectImpl(vmThread, actualAddress, isVolatile);
protectIfVolatileAfter(isVolatile, true);
return result;
#else /* J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER */
#error unsupported barrier
#endif /* J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER */
}
/**
* Store an object pointer into an object.
*
* This function performs all of the necessary barriers and calls OOL when it can not handle
* the barrier itself.
*
* @param srcObject the object being stored into
* @param srcOffset the offset with in srcObject to store value
* @param value the value to be stored
* @param isVolatile non-zero if the field is volatile, zero otherwise
*/
VMINLINE void
inlineMixedObjectStoreObject(J9VMThread *vmThread, j9object_t srcObject, UDATA srcOffset, j9object_t value, bool isVolatile = false)
{
#if defined(J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER)
vmThread->javaVM->memoryManagerFunctions->j9gc_objaccess_mixedObjectStoreObject(vmThread, srcObject, srcOffset, value, isVolatile);
#elif defined(J9VM_GC_COMBINATION_SPEC)
if (j9gc_modron_wrtbar_always == _writeBarrierType) {
vmThread->javaVM->memoryManagerFunctions->j9gc_objaccess_mixedObjectStoreObject(vmThread, srcObject, srcOffset, value, isVolatile);
} else {
fj9object_t *actualAddress = J9OAB_MIXEDOBJECT_EA(srcObject, srcOffset, fj9object_t);
preMixedObjectStoreObject(vmThread, srcObject, actualAddress, value);
protectIfVolatileBefore(isVolatile, false);
storeObjectImpl(vmThread, actualAddress, value, isVolatile);
protectIfVolatileAfter(isVolatile, false);
postMixedObjectStoreObject(vmThread, srcObject, actualAddress, value);
}
#else /* J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER */
#error unsupported barrier
#endif /* J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER */
}
/**
* Store an object pointer into an object atomically.
*
* This function performs all of the necessary barriers and calls OOL when it can not handle
* the barrier itself.
*
* @param destObject the object being stored into
* @param destOffset the offset with in srcObject to store value
* @param compareObject the object to compare with
* @param swapObject the value to be swapped in
* @param isVolatile non-zero if the field is volatile, zero otherwise
*
* @return true on success, false otherwise
*/
VMINLINE bool
inlineMixedObjectCompareAndSwapObject(J9VMThread *vmThread, j9object_t destObject, UDATA destOffset, j9object_t compareObject, j9object_t swapObject, bool isVolatile = false)
{
fj9object_t *destAddress = J9OAB_MIXEDOBJECT_EA(destObject, destOffset, fj9object_t);
#if defined(J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER)
return (1 == vmThread->javaVM->memoryManagerFunctions->j9gc_objaccess_compareAndSwapObject(vmThread, destObject, (J9Object **)destAddress, compareObject, swapObject));
#elif defined(J9VM_GC_COMBINATION_SPEC)
if (j9gc_modron_wrtbar_always == _writeBarrierType) {
return (1 == vmThread->javaVM->memoryManagerFunctions->j9gc_objaccess_compareAndSwapObject(vmThread, destObject, (J9Object **)destAddress, compareObject, swapObject));
} else {
preMixedObjectReadObject(vmThread, destObject, destAddress);
preMixedObjectStoreObject(vmThread, destObject, destAddress, swapObject);
protectIfVolatileBefore(isVolatile, false);
bool result = compareAndSwapObjectImpl(vmThread, destAddress, compareObject, swapObject, isVolatile);
protectIfVolatileAfter(isVolatile, false);
if (result) {
postMixedObjectStoreObject(vmThread, destObject, destAddress, swapObject);
}
return result;
}
#else /* J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER */
#error unsupported barrier
#endif /* J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER */
}
/**
* Conditionally store an object pointer into an object atomically.
*
* This function performs all of the necessary barriers and calls OOL when it can not handle
* the barrier itself.
*
* @param destObject the object being stored into
* @param destOffset the offset with in srcObject to store value
* @param compareObject the object to compare with
* @param swapObject the value to be swapped in
* @param isVolatile non-zero if the field is volatile, zero otherwise
*
* @return the object stored in the object field before the update
*/
VMINLINE j9object_t
inlineMixedObjectCompareAndExchangeObject(J9VMThread *vmThread, j9object_t destObject, UDATA destOffset, j9object_t compareObject, j9object_t swapObject, bool isVolatile = false)
{
fj9object_t *destAddress = J9OAB_MIXEDOBJECT_EA(destObject, destOffset, fj9object_t);
#if defined(J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER)
return vmThread->javaVM->memoryManagerFunctions->j9gc_objaccess_compareAndExchangeObject(vmThread, destObject, (J9Object **)destAddress, compareObject, swapObject);
#elif defined(J9VM_GC_COMBINATION_SPEC)
if (j9gc_modron_wrtbar_always == _writeBarrierType) {
return vmThread->javaVM->memoryManagerFunctions->j9gc_objaccess_compareAndExchangeObject(vmThread, destObject, (J9Object **)destAddress, compareObject, swapObject);
} else {
preMixedObjectReadObject(vmThread, destObject, destAddress);
preMixedObjectStoreObject(vmThread, destObject, destAddress, swapObject);
protectIfVolatileBefore(isVolatile, false);
fj9object_t resultToken = compareAndExchangeObjectImpl(vmThread, destAddress, compareObject, swapObject, isVolatile);
protectIfVolatileAfter(isVolatile, false);
j9object_t result = internalConvertPointerFromToken(resultToken);
if (result == compareObject) {
postMixedObjectStoreObject(vmThread, destObject, destAddress, swapObject);
}
return result;
}
#else /* J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER */
#error unsupported barrier
#endif /* J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER */
}
/**
* Read an I_32 field: perform any pre-use barriers, calculate an effective address
* and perform the work.
*
* @param srcObject The object being used.
* @param srcOffset The offset of the field.
* @param isVolatile non-zero if the field is volatile.
*/
VMINLINE I_32
inlineMixedObjectReadI32(J9VMThread *vmThread, j9object_t srcObject, UDATA srcOffset, bool isVolatile = false)
{
#if defined(J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER)
return (I_32)vmThread->javaVM->memoryManagerFunctions->j9gc_objaccess_mixedObjectReadI32(vmThread, srcObject, srcOffset, isVolatile);
#elif defined(J9VM_GC_COMBINATION_SPEC)
I_32 *actualAddress = J9OAB_MIXEDOBJECT_EA(srcObject, srcOffset, I_32);
protectIfVolatileBefore(isVolatile, true);
I_32 result = readI32Impl(vmThread, actualAddress, isVolatile);
protectIfVolatileAfter(isVolatile, true);
return result;
#else /* J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER */
#error unsupported barrier
#endif /* J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER */
}
/**
* Store an I_32 value into an object.
*
* This function performs all of the necessary barriers and calls OOL when it can not handle
* the barrier itself.
*
* @param srcObject the object being stored into
* @param srcOffset the offset with in srcObject to store value
* @param value the value to be stored
* @param isVolatile non-zero if the field is volatile, zero otherwise
*/
VMINLINE void
inlineMixedObjectStoreI32(J9VMThread *vmThread, j9object_t srcObject, UDATA srcOffset, I_32 value, bool isVolatile = false)
{
#if defined(J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER)
vmThread->javaVM->memoryManagerFunctions->j9gc_objaccess_mixedObjectStoreI32(vmThread, srcObject, srcOffset, value, isVolatile);
#elif defined(J9VM_GC_COMBINATION_SPEC)
I_32 *actualAddress = J9OAB_MIXEDOBJECT_EA(srcObject, srcOffset, I_32);
protectIfVolatileBefore(isVolatile, false);
storeI32Impl(vmThread, actualAddress, value, isVolatile);
protectIfVolatileAfter(isVolatile, false);
#else /* J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER */
#error unsupported barrier
#endif /* J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER */
}
/**
* Read a U_32 field: perform any pre-use barriers, calculate an effective address
* and perform the work.
*
* @param srcObject The object being used.
* @param srcOffset The offset of the field.
* @param isVolatile non-zero if the field is volatile.
*/
VMINLINE U_32
inlineMixedObjectReadU32(J9VMThread *vmThread, j9object_t srcObject, UDATA srcOffset, bool isVolatile = false)
{
#if defined(J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER)
return (U_32)vmThread->javaVM->memoryManagerFunctions->j9gc_objaccess_mixedObjectReadU32(vmThread, srcObject, srcOffset, isVolatile);
#elif defined(J9VM_GC_COMBINATION_SPEC)
U_32 *actualAddress = J9OAB_MIXEDOBJECT_EA(srcObject, srcOffset, U_32);
protectIfVolatileBefore(isVolatile, true);
U_32 result = readU32Impl(vmThread, actualAddress, isVolatile);
protectIfVolatileAfter(isVolatile, true);
return result;
#else /* J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER */
#error unsupported barrier
#endif /* J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER */
}
/**
* Store an U_32 value into an object.
*
* This function performs all of the necessary barriers and calls OOL when it can not handle
* the barrier itself.
*
* @param srcObject the object being stored into
* @param srcOffset the offset with in srcObject to store value
* @param value the value to be stored
* @param isVolatile non-zero if the field is volatile, zero otherwise
*/
VMINLINE void
inlineMixedObjectStoreU32(J9VMThread *vmThread, j9object_t srcObject, UDATA srcOffset, U_32 value, bool isVolatile = false)
{
#if defined(J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER)
vmThread->javaVM->memoryManagerFunctions->j9gc_objaccess_mixedObjectStoreU32(vmThread, srcObject, srcOffset, value, isVolatile);
#elif defined(J9VM_GC_COMBINATION_SPEC)
U_32 *actualAddress = J9OAB_MIXEDOBJECT_EA(srcObject, srcOffset, U_32);
protectIfVolatileBefore(isVolatile, false);
storeU32Impl(vmThread, actualAddress, value, isVolatile);
protectIfVolatileAfter(isVolatile, false);
#else /* J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER */
#error unsupported barrier
#endif /* J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER */
}
/**
* Store an U_32 value into an object atomically
*
* This function performs all of the necessary barriers and calls OOL when it can not handle
* the barrier itself.
*
* @param destObject the object being stored into
* @param destOffset the offset with in srcObject to store value
* @param compareObject the object to compare with
* @param swapObject the value to be swapped in
* @param isVolatile non-zero if the field is volatile, zero otherwise
*
* @return true on success, false otherwise
*/
VMINLINE bool
inlineMixedObjectCompareAndSwapU32(J9VMThread *vmThread, j9object_t destObject, UDATA destOffset, U_32 compareValue, U_32 swapValue, bool isVolatile = false)
{
#if defined(J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER)
return (1 == vmThread->javaVM->memoryManagerFunctions->j9gc_objaccess_mixedObjectCompareAndSwapInt(vmThread, destObject, destOffset, compareValue, swapValue));
#elif defined(J9VM_GC_COMBINATION_SPEC)
U_32 *actualAddress = J9OAB_MIXEDOBJECT_EA(destObject, destOffset, U_32);
protectIfVolatileBefore(isVolatile, false);
bool result = compareAndSwapU32Impl(vmThread, actualAddress, compareValue, swapValue, isVolatile);
protectIfVolatileAfter(isVolatile, false);
return result;
#else /* J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER */
#error unsupported barrier
#endif /* J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER */
}
/**
* Conditionally store a U_32 value into an object atomically
*
* This function performs all of the necessary barriers and calls OOL when it can not handle
* the barrier itself.
*
* @param destObject the object being stored into
* @param destOffset the offset with in srcObject to store value
* @param compareObject the object to compare with
* @param swapObject the value to be swapped in
* @param isVolatile non-zero if the field is volatile, zero otherwise
*
* @return the value stored in the object field before the update
*/
VMINLINE U_32
inlineMixedObjectCompareAndExchangeU32(J9VMThread *vmThread, j9object_t destObject, UDATA destOffset, U_32 compareValue, U_32 swapValue, bool isVolatile = false)
{
#if defined(J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER)
return vmThread->javaVM->memoryManagerFunctions->j9gc_objaccess_mixedObjectCompareAndExchangeInt(vmThread, destObject, destOffset, compareValue, swapValue);
#elif defined(J9VM_GC_COMBINATION_SPEC)
U_32 *actualAddress = J9OAB_MIXEDOBJECT_EA(destObject, destOffset, U_32);
protectIfVolatileBefore(isVolatile, false);
U_32 result = compareAndExchangeU32Impl(vmThread, actualAddress, compareValue, swapValue, isVolatile);
protectIfVolatileAfter(isVolatile, false);
return result;
#else /* J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER */
#error unsupported barrier
#endif /* J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER */
}
/**
* Read an I_64 field: perform any pre-use barriers, calculate an effective address
* and perform the work.
*
* @param srcObject The object being used.
* @param srcOffset The offset of the field.
* @param isVolatile non-zero if the field is volatile.
*/
VMINLINE I_64
inlineMixedObjectReadI64(J9VMThread *vmThread, j9object_t srcObject, UDATA srcOffset, bool isVolatile = false)
{
#if defined(J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER)
return vmThread->javaVM->memoryManagerFunctions->j9gc_objaccess_mixedObjectReadI64(vmThread, srcObject, srcOffset, isVolatile);
#elif defined(J9VM_GC_COMBINATION_SPEC)
I_64 *actualAddress = J9OAB_MIXEDOBJECT_EA(srcObject, srcOffset, I_64);
protectIfVolatileBefore(isVolatile, true);
I_64 result = readI64Impl(vmThread, actualAddress, isVolatile);
protectIfVolatileAfter(isVolatile, true);
return result;
#else /* J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER */
#error unsupported barrier
#endif /* J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER */
}
/**
* Store an I_64 value into an object.
*
* This function performs all of the necessary barriers and calls OOL when it can not handle
* the barrier itself.
*
* @param srcObject the object being stored into
* @param srcOffset the offset with in srcObject to store value
* @param value the value to be stored
* @param isVolatile non-zero if the field is volatile, zero otherwise
*/
VMINLINE void
inlineMixedObjectStoreI64(J9VMThread *vmThread, j9object_t srcObject, UDATA srcOffset, I_64 value, bool isVolatile = false)
{
#if defined(J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER)
vmThread->javaVM->memoryManagerFunctions->j9gc_objaccess_mixedObjectStoreI64(vmThread, srcObject, srcOffset, value, isVolatile);
#elif defined(J9VM_GC_COMBINATION_SPEC)
I_64 *actualAddress = J9OAB_MIXEDOBJECT_EA(srcObject, srcOffset, I_64);
protectIfVolatileBefore(isVolatile, false);
storeI64Impl(vmThread, actualAddress, value, isVolatile);
protectIfVolatileAfter(isVolatile, false);
#else /* J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER */
#error unsupported barrier
#endif /* J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER */
}
/**
* Read a U_64 field: perform any pre-use barriers, calculate an effective address
* and perform the work.
*
* @param srcObject The object being used.
* @param srcOffset The offset of the field.
* @param isVolatile non-zero if the field is volatile.
*/
VMINLINE U_64
inlineMixedObjectReadU64(J9VMThread *vmThread, j9object_t srcObject, UDATA srcOffset, bool isVolatile = false)
{
#if defined(J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER)
return vmThread->javaVM->memoryManagerFunctions->j9gc_objaccess_mixedObjectReadU64(vmThread, srcObject, srcOffset, isVolatile);
#elif defined(J9VM_GC_COMBINATION_SPEC)
U_64 *actualAddress = J9OAB_MIXEDOBJECT_EA(srcObject, srcOffset, U_64);
protectIfVolatileBefore(isVolatile, true);
U_64 result = readU64Impl(vmThread, actualAddress, isVolatile);
protectIfVolatileAfter(isVolatile, true);
return result;
#else /* J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER */
#error unsupported barrier
#endif /* J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER */
}
/**
* Store an U_64 value into an object.
*
* This function performs all of the necessary barriers and calls OOL when it can not handle
* the barrier itself.
*
* @param srcObject the object being stored into
* @param srcOffset the offset with in srcObject to store value
* @param value the value to be stored
* @param isVolatile non-zero if the field is volatile, zero otherwise
*/
VMINLINE void
inlineMixedObjectStoreU64(J9VMThread *vmThread, j9object_t srcObject, UDATA srcOffset, U_64 value, bool isVolatile = false)
{
#if defined(J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER)
vmThread->javaVM->memoryManagerFunctions->j9gc_objaccess_mixedObjectStoreU64(vmThread, srcObject, srcOffset, value, isVolatile);
#elif defined(J9VM_GC_COMBINATION_SPEC)
U_64 *actualAddress = J9OAB_MIXEDOBJECT_EA(srcObject, srcOffset, U_64);
protectIfVolatileBefore(isVolatile, false);
storeU64Impl(vmThread, actualAddress, value, isVolatile);
protectIfVolatileAfter(isVolatile, false);
#else /* J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER */
#error unsupported barrier
#endif /* J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER */
}
/**
* Store an U_64 value into an object atomically
*
* This function performs all of the necessary barriers and calls OOL when it can not handle
* the barrier itself.
*
* @param destObject the object being stored into
* @param destOffset the offset with in srcObject to store value
* @param compareObject the object to compare with
* @param swapObject the value to be swapped in
* @param isVolatile non-zero if the field is volatile, zero otherwise
*
* @return true on success, false otherwise
*/
VMINLINE bool
inlineMixedObjectCompareAndSwapU64(J9VMThread *vmThread, j9object_t destObject, UDATA destOffset, U_64 compareValue, U_64 swapValue, bool isVolatile = false)
{
#if defined(J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER)
return (1 == vmThread->javaVM->memoryManagerFunctions->j9gc_objaccess_mixedObjectCompareAndSwapLong(vmThread, destObject, destOffset, compareValue, swapValue));
#elif defined(J9VM_GC_COMBINATION_SPEC)
U_64 *actualAddress = J9OAB_MIXEDOBJECT_EA(destObject, destOffset, U_64);
protectIfVolatileBefore(isVolatile, false);
bool result = compareAndSwapU64Impl(vmThread, actualAddress, compareValue, swapValue, isVolatile);
protectIfVolatileAfter(isVolatile, false);
return result;
#else /* J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER */
#error unsupported barrier
#endif /* J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER */
}
/**
* Conditionally store a U_64 value into an object atomically
*
* This function performs all of the necessary barriers and calls OOL when it can not handle
* the barrier itself.
*
* @param destObject the object being stored into
* @param destOffset the offset with in srcObject to store value
* @param compareObject the object to compare with
* @param swapObject the value to be swapped in
* @param isVolatile non-zero if the field is volatile, zero otherwise
*
* @return the value stored in the object field before the update
*/
VMINLINE U_64
inlineMixedObjectCompareAndExchangeU64(J9VMThread *vmThread, j9object_t destObject, UDATA destOffset, U_64 compareValue, U_64 swapValue, bool isVolatile = false)
{
#if defined(J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER)
return vmThread->javaVM->memoryManagerFunctions->j9gc_objaccess_mixedObjectCompareAndExchangeLong(vmThread, destObject, destOffset, compareValue, swapValue);
#elif defined(J9VM_GC_COMBINATION_SPEC)
U_64 *actualAddress = J9OAB_MIXEDOBJECT_EA(destObject, destOffset, U_64);
protectIfVolatileBefore(isVolatile, false);
U_64 result = compareAndExchangeU64Impl(vmThread, actualAddress, compareValue, swapValue, isVolatile);
protectIfVolatileAfter(isVolatile, false);
return result;
#else /* J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER */
#error unsupported barrier
#endif /* J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER */
}
/**
* Read a static object field: perform any pre-use barriers, calculate an effective address
* and perform the work.
*
* @param clazz The J9Class being written to.
* @param srcAddress The offset of the field.
* @param isVolatile non-zero if the field is volatile.
*/
VMINLINE j9object_t
inlineStaticReadObject(J9VMThread *vmThread, J9Class *clazz, j9object_t *srcAddress, bool isVolatile = false)
{
#if defined(J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER)
return vmThread->javaVM->memoryManagerFunctions->j9gc_objaccess_staticReadObject(vmThread, clazz, srcAddress, isVolatile);
#elif defined(J9VM_GC_COMBINATION_SPEC)
preStaticReadObject(vmThread, clazz, srcAddress);
protectIfVolatileBefore(isVolatile, true);
j9object_t result = staticReadObjectImpl(vmThread, srcAddress, isVolatile);
protectIfVolatileAfter(isVolatile, true);
/* TODO handle postReadBarrier if RTJ every becomes combo */
return result;
#else /* J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER */
#error unsupported barrier
#endif /* J9VM_GC_ALWAYS_CALL_OBJECT_ACCESS_BARRIER */
}
/**
* Store an object value into a static.
*
* This function performs all of the necessary barriers and calls OOL when it can not handle