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CacheMap.cpp
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/*******************************************************************************
* Copyright (c) 2001, 2020 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
*******************************************************************************/
#include "CacheMap.hpp"
#include "Managers.hpp"
#include "ClasspathManagerImpl2.hpp"
#include "ROMClassManagerImpl.hpp"
#include "TimestampManagerImpl.hpp"
#include "CompiledMethodManagerImpl.hpp"
#include "ScopeManagerImpl.hpp"
#include "ByteDataManagerImpl.hpp"
#include "AttachedDataManagerImpl.hpp"
#include "CompositeCacheImpl.hpp"
#include "UnitTest.hpp"
#include "AtomicSupport.hpp"
#include "ut_j9shr.h"
#include "j2sever.h"
#include "j9shrnls.h"
#include "j9comp.h"
#include "j9consts.h"
#include <string.h>
extern "C" {
#include "shrinit.h"
}
/* Trace macros should be used if messages should be affected by verboseLevel */
#define CACHEMAP_TRACE(verboseLevel, nlsFlags, var1) if (_verboseFlags & verboseLevel) j9nls_printf(PORTLIB, nlsFlags, var1)
#define CACHEMAP_TRACE1(verboseLevel, nlsFlags, var1, p1) if (_verboseFlags & verboseLevel) j9nls_printf(PORTLIB, nlsFlags, var1, p1)
#define CACHEMAP_TRACE2(verboseLevel, nlsFlags, var1, p1, p2) if (_verboseFlags & verboseLevel) j9nls_printf(PORTLIB, nlsFlags, var1, p1, p2)
#define CACHEMAP_TRACE3(verboseLevel, nlsFlags, var1, p1, p2, p3) if (_verboseFlags & verboseLevel) j9nls_printf(PORTLIB, nlsFlags, var1, p1, p2, p3)
#define CACHEMAP_TRACE4(verboseLevel, nlsFlags, var1, p1, p2, p3, p4) if (_verboseFlags & verboseLevel) j9nls_printf(PORTLIB, nlsFlags, var1, p1, p2, p3, p4)
/* Print macros should be used if message should always be printed */
#define CACHEMAP_PRINT(nlsFlags, var1) j9nls_printf(PORTLIB, nlsFlags, var1)
#define CACHEMAP_PRINT1(nlsFlags, var1, p1) j9nls_printf(PORTLIB, nlsFlags, var1, p1)
#define CACHEMAP_PRINT2(nlsFlags, var1, p1, p2) j9nls_printf(PORTLIB, nlsFlags, var1, p1, p2)
#define CACHEMAP_PRINT3(nlsFlags, var1, p1, p2, p3) j9nls_printf(PORTLIB, nlsFlags, var1, p1, p2, p3)
#define CACHEMAP_PRINT4(nlsFlags, var1, p1, p2, p3, p4) j9nls_printf(PORTLIB, nlsFlags, var1, p1, p2, p3, p4)
#define CACHEMAP_PRINT5(nlsFlags, var1, p1, p2, p3, p4, p5) j9nls_printf(PORTLIB, nlsFlags, var1, p1, p2, p3, p4, p5)
#define CACHEMAP_PRINT6(nlsFlags, var1, p1, p2, p3, p4, p5, p6) j9nls_printf(PORTLIB, nlsFlags, var1, p1, p2, p3, p4, p5, p6)
#define CACHEMAP_PRINT7(nlsFlags, var1, p1, p2, p3, p4, p5, p6, p7) j9nls_printf(PORTLIB, nlsFlags, var1, p1, p2, p3, p4, p5, p6, p7)
#define CACHEMAP_PRINT8(nlsFlags, var1, p1, p2, p3, p4, p5, p6, p7, p8) j9nls_printf(PORTLIB, nlsFlags, var1, p1, p2, p3, p4, p5, p6, p7, p8)
#define CACHEMAP_FMTPRINT1(nlsFlags, var1, p1) j9nls_printf(PORTLIB, nlsFlags, var1, 1,' ',p1)
static char* formatAttachedDataString(J9VMThread* currentThread, U_8 *attachedData, UDATA attachedDataLength, char *attachedDataStringBuffer, UDATA bufferLength);
static void checkROMClassUTF8SRPs(J9ROMClass *romClass);
/* If you make this sleep a lot longer, it almost eliminates store contention
* because the VMs get out of step with each other, but you delay excessively */
#define WRITE_HASH_WAIT_MAX_MICROS 80000
#define DEFAULT_WRITE_HASH_WAIT_MILLIS 10
#define WRITE_HASH_DEFAULT_MAX_MICROS 20000
#define MARK_STALE_RETRY_TIMES 10
#define VERBOSE_BUFFER_SIZE 255
/* TODO: May want to make this cachelet size configurable */
#define J9SHR_DEFAULT_CACHELET_SIZE (1024 * 1024)
#define J9SHR_NESTED_CACHE_TEMP_NAME "nested_temp"
/* All flags should be false. Don't EVER update the cache when set. */
#define RUNTIME_FLAGS_PREVENT_BLOCK_DATA_UPDATE (J9SHR_RUNTIMEFLAG_DENY_CACHE_UPDATES | J9SHR_RUNTIMEFLAG_BLOCK_SPACE_FULL | J9SHR_RUNTIMEFLAG_AVAILABLE_SPACE_FULL)
#define RUNTIME_FLAGS_PREVENT_AOT_DATA_UPDATE (J9SHR_RUNTIMEFLAG_DENY_CACHE_UPDATES | J9SHR_RUNTIMEFLAG_AOT_SPACE_FULL)
#define RUNTIME_FLAGS_PREVENT_JIT_DATA_UPDATE (J9SHR_RUNTIMEFLAG_DENY_CACHE_UPDATES | J9SHR_RUNTIMEFLAG_JIT_SPACE_FULL)
#define MAX_INT 0x7fffffff
#define FIND_ATTACHED_DATA_RETRY_COUNT 1
#define FIND_ATTACHED_DATA_CORRUPT_WAIT_TIME 1
struct TR_AOTHeader;
/**
* @param currentThread - the currentThread or NULL when called to collect javacore data
*
* Assumes the mutex can't be entered recursively
*/
IDATA
SH_CacheMap::enterLocalMutex(J9VMThread* currentThread, omrthread_monitor_t monitor, const char* name, const char* caller)
{
if (_isAssertEnabled) {
Trc_SHR_Assert_ShouldNotHaveLocalMutex(monitor);
}
/* WARNING - currentThread can be NULL */
return enterReentrantLocalMutex(currentThread, monitor, name, caller);
}
/**
* @param currentThread - the currentThread or NULL when called to collect javacore data
*
* Assumes the mutex can't be entered recursively
*/
IDATA
SH_CacheMap::exitLocalMutex(J9VMThread* currentThread, omrthread_monitor_t monitor, const char* name, const char* caller)
{
if (_isAssertEnabled) {
Trc_SHR_Assert_ShouldHaveLocalMutex(monitor);
}
/* WARNING - currentThread can be NULL */
return exitReentrantLocalMutex(currentThread, monitor, name, caller);
}
/**
* @param currentThread - the currentThread or NULL when called to collect javacore data
*/
IDATA
SH_CacheMap::enterReentrantLocalMutex(J9VMThread* currentThread, omrthread_monitor_t monitor, const char* name, const char* caller)
{
IDATA rc = 0;
/* WARNING - currentThread can be NULL */
Trc_SHR_CM_enterLocalMutex_pre(currentThread, name, caller);
rc = omrthread_monitor_enter(monitor);
Trc_SHR_CM_enterLocalMutex_post(currentThread, name, rc, caller);
return rc;
}
/**
* @param currentThread - the currentThread or NULL when called to collect javacore data
*/
IDATA
SH_CacheMap::exitReentrantLocalMutex(J9VMThread* currentThread, omrthread_monitor_t monitor, const char* name, const char* caller)
{
IDATA rc = 0;
/* WARNING - currentThread can be NULL */
Trc_SHR_CM_exitLocalMutex_pre(currentThread, name, caller);
rc = omrthread_monitor_exit(monitor);
Trc_SHR_CM_exitLocalMutex_post(currentThread, name, rc, caller);
return rc;
}
IDATA
SH_CacheMap::enterRefreshMutex(J9VMThread* currentThread, const char* caller)
{
IDATA rc;
if ((rc = enterReentrantLocalMutex(currentThread, _refreshMutex, "_refreshMutex", caller)) == 0) {
if (1 == ((J9ThreadAbstractMonitor*)_refreshMutex)->count) {
/* nonrecursive enter */
SH_CompositeCacheImpl* ccToUse = _ccHead;
do {
ccToUse->notifyRefreshMutexEntered(currentThread);
ccToUse = ccToUse->getNext();
} while (NULL != ccToUse);
}
}
return rc;
}
IDATA
SH_CacheMap::exitRefreshMutex(J9VMThread* currentThread, const char* caller)
{
IDATA rc;
Trc_SHR_Assert_ShouldHaveLocalMutex(_refreshMutex);
if (1 == ((J9ThreadAbstractMonitor*)_refreshMutex)->count) {
/* nonrecursive exit */
SH_CompositeCacheImpl* ccToUse = _ccHead;
do {
ccToUse->notifyRefreshMutexExited(currentThread);
ccToUse = ccToUse->getNext();
} while (NULL != ccToUse);
}
rc = exitReentrantLocalMutex(currentThread, _refreshMutex, "_refreshMutex", caller);
return rc;
}
/**
* Builds a new SH_CacheMap
* THREADING: Only ever single threaded
*
* @param [in] vm A Java VM
* @param [in] sharedClassConfig
* @param [in] memForConstructor Should be memory of the size from getRequiredConstrBytes
* @param [in] cacheName The name of the cache
* @param [in] cacheTypeRequired The cache type required
*
* @return A pointer to the new CacheMap
*/
SH_CacheMap*
SH_CacheMap::newInstance(J9JavaVM* vm, J9SharedClassConfig* sharedClassConfig, SH_CacheMap* memForConstructor, const char* cacheName, I_32 cacheTypeRequired)
{
SH_CacheMap* newCacheMap = memForConstructor;
I_8 topLayer = 0;
if (NULL != sharedClassConfig) {
/* sharedClassConfig can be null in shrtest */
topLayer = sharedClassConfig->layer;
}
Trc_SHR_CM_newInstance_Entry(vm);
new(newCacheMap) SH_CacheMap();
newCacheMap->initialize(vm, sharedClassConfig, ((BlockPtr)memForConstructor + sizeof(SH_CacheMap)), cacheName, cacheTypeRequired, topLayer, false);
Trc_SHR_CM_newInstance_Exit();
return newCacheMap;
}
/**
* Advise the OS to release resources associated with
* the metadata which have been accessed to date.
*/
void
SH_CacheMap::dontNeedMetadata(J9VMThread* currentThread)
{
Trc_SHR_CM_j9shr_dontNeedMetadata(currentThread);
SH_CompositeCacheImpl* ccToUse = _ccHead;
if (_metadataReleased) {
return;
}
_metadataReleased = true;
do {
ccToUse->dontNeedMetadata(currentThread);
ccToUse = ccToUse->getNext();
} while (NULL != ccToUse);
}
/**
* Builds a new SH_CacheMap for retrieving cache statistics
*
* @param [in] vm A Java VM
* @param [in] memForConstructor Should be memory of the size from getRequiredConstrBytes
* @param [in] cacheName The name of the cache
* @param [in] topLayer the top layer number
*
* @return A pointer to the CacheMapStats
*/
SH_CacheMapStats*
SH_CacheMap::newInstanceForStats(J9JavaVM* vm, SH_CacheMap* memForConstructor, const char* cacheName, I_8 topLayer)
{
SH_CacheMap* newCacheMap = memForConstructor;
Trc_SHR_CM_newInstanceForStats_Entry(vm);
new(newCacheMap) SH_CacheMap();
newCacheMap->initialize(vm, NULL, ((BlockPtr)memForConstructor + sizeof(SH_CacheMap)), cacheName, 0, topLayer, true);
Trc_SHR_CM_newInstanceForStats_Exit();
return newCacheMap;
}
/* THREADING: Only ever single threaded */
void
SH_CacheMap::initialize(J9JavaVM* vm, J9SharedClassConfig* sharedClassConfig, BlockPtr memForConstructor, const char* cacheName, I_32 cacheTypeRequired, I_8 topLayer, bool startupForStats)
{
BlockPtr allocPtr = memForConstructor;
Trc_SHR_CM_initialize_Entry1(UnitTest::unitTest);
_sharedClassConfig = sharedClassConfig;
_portlib = vm->portLibrary;
_cacheCorruptReported = false;
_refreshMutex = NULL;
_writeHashMaxWaitMicros = WRITE_HASH_DEFAULT_MAX_MICROS;
_writeHashSavedMaxWaitMicros = 0;
_writeHashAverageTimeMicros = 0;
_writeHashContendedResetHash = 0;
_bytesRead = 0;
_cacheletCntr = 0;
_cacheletTail = NULL;
_cacheletHead = NULL;
_runningNested = false;
_growEnabled = false;
_isSerialized = false;
_isAssertEnabled = true;
_metadataReleased = false;
/* TODO: Need this function to be able to return pass/fail */
#if defined(J9SHR_CACHELET_SUPPORT)
_ccPool = pool_new(SH_CompositeCacheImpl::getRequiredConstrBytes(true, startupForStats), 0, 0, 0, J9_GET_CALLSITE(), J9MEM_CATEGORY_CLASSES, POOL_FOR_PORT(_portlib));
#else
_ccPool = NULL;
#endif
_managers = SH_Managers::newInstance(vm, (SH_Managers *)allocPtr);
_ccHead = _cc = SH_CompositeCacheImpl::newInstance(vm, sharedClassConfig, (SH_CompositeCacheImpl*)(allocPtr += SH_Managers::getRequiredConstrBytes()), cacheName, cacheTypeRequired, startupForStats, topLayer);
_ccHead->setNext(NULL);
_ccHead->setPrevious(NULL);
_ccTail = _ccHead;
memset(_cacheAddressRangeArray, 0, sizeof(_cacheAddressRangeArray));
_numOfCacheLayers = 0;
_tsm = SH_TimestampManagerImpl::newInstance(vm, (SH_TimestampManagerImpl*)(allocPtr += SH_CompositeCacheImpl::getRequiredConstrBytesWithCommonInfo(false, startupForStats)), sharedClassConfig);
_cpm = SH_ClasspathManagerImpl2::newInstance(vm, this, _tsm, (SH_ClasspathManagerImpl2*)(allocPtr += SH_TimestampManagerImpl::getRequiredConstrBytes()));
_scm = SH_ScopeManagerImpl::newInstance(vm, this, (SH_ScopeManagerImpl*)(allocPtr += SH_ClasspathManagerImpl2::getRequiredConstrBytes()));
_rcm = SH_ROMClassManagerImpl::newInstance(vm, this, _tsm, (SH_ROMClassManagerImpl*)(allocPtr += SH_ScopeManagerImpl::getRequiredConstrBytes()));
_cmm = SH_CompiledMethodManagerImpl::newInstance(vm, this, (SH_CompiledMethodManagerImpl*)(allocPtr += SH_ROMClassManagerImpl::getRequiredConstrBytes()));
_bdm = SH_ByteDataManagerImpl::newInstance(vm, this, (SH_ByteDataManagerImpl*)(allocPtr += SH_CompiledMethodManagerImpl::getRequiredConstrBytes()));
_adm = SH_AttachedDataManagerImpl::newInstance(vm, this, (SH_AttachedDataManagerImpl*)(allocPtr += SH_ByteDataManagerImpl::getRequiredConstrBytes()));
Trc_SHR_CM_initialize_Exit();
}
/**
* Returns memory bytes the constructor requires to build what it needs
* THREADING: Only ever single threaded
*
* @return bytes required
*/
UDATA
SH_CacheMap::getRequiredConstrBytes(bool startupForStats)
{
UDATA reqBytes = 0;
reqBytes += SH_CompositeCacheImpl::getRequiredConstrBytesWithCommonInfo(false, startupForStats);
reqBytes += SH_TimestampManagerImpl::getRequiredConstrBytes();
reqBytes += SH_ClasspathManagerImpl2::getRequiredConstrBytes();
reqBytes += SH_ROMClassManagerImpl::getRequiredConstrBytes();
reqBytes += SH_ScopeManagerImpl::getRequiredConstrBytes();
reqBytes += SH_CompiledMethodManagerImpl::getRequiredConstrBytes();
reqBytes += SH_ByteDataManagerImpl::getRequiredConstrBytes();
reqBytes += SH_AttachedDataManagerImpl::getRequiredConstrBytes();
reqBytes += SH_Managers::getRequiredConstrBytes();
reqBytes += sizeof(SH_CacheMap);
return reqBytes;
}
/**
* Clean up resources
*
* THREADING: Only ever single threaded
*/
void
SH_CacheMap::cleanup(J9VMThread* currentThread)
{
SH_Manager* walkManager;
SH_Managers::ManagerWalkState state;
SH_CompositeCacheImpl* theCC = _ccHead;
PORT_ACCESS_FROM_PORT(_portlib);
Trc_SHR_CM_cleanup_Entry(currentThread);
walkManager = managers()->startDo(currentThread, 0, &state);
while (walkManager) {
walkManager->cleanup(currentThread);
walkManager = managers()->nextDo(&state);
}
while (theCC) {
SH_CompositeCacheImpl* nextCC = theCC->getNext();
theCC->cleanup(currentThread);
if (_ccHead != theCC) {
/* _ccHead is deallocated together with sharedClassConfig in j9shr_shutdown() */
j9mem_free_memory(theCC);
}
theCC = nextCC;
}
if (_sharedClassConfig) {
this->resetCacheDescriptorList(currentThread, _sharedClassConfig);
}
if (_refreshMutex) {
omrthread_monitor_destroy(_refreshMutex);
_refreshMutex = NULL;
}
if (_ccPool) {
pool_kill(_ccPool);
}
Trc_SHR_CM_cleanup_Exit(currentThread);
}
/* Walks the ROMClasses in the ROMClass segment performing a quick check to make
* sure that the walk produces sensible results. Any failure in the walk should result
* in a corrupted cache behaviour. */
UDATA
SH_CacheMap::sanityWalkROMClassSegment(J9VMThread* currentThread, SH_CompositeCacheImpl* cache)
{
U_8 *walk, *prev, *endOfROMSegment;
PORT_ACCESS_FROM_PORT(_portlib);
Trc_SHR_CM_sanityWalkROMClassSegment_Entry(currentThread);
endOfROMSegment = (U_8*)cache->getSegmentAllocPtr();
walk = (U_8*)cache->getBaseAddress();
while (walk < endOfROMSegment) {
prev = walk;
walk = walk + ((J9ROMClass*)walk)->romSize;
/* Simply check that we didn't walk backwards, zero or beyond the end of the segment */
if ((walk <= prev) || (walk > endOfROMSegment)) {
Trc_SHR_CM_sanityWalkROMClassSegment_ExitBad(currentThread, prev, walk);
CACHEMAP_TRACE1(J9SHR_VERBOSEFLAG_ENABLE_VERBOSE_DEFAULT, J9NLS_ERROR, J9NLS_SHRC_CM_READ_CORRUPT_ROMCLASS, walk);
cache->setCorruptCache(currentThread, ROMCLASS_CORRUPT, (UDATA)walk);
return 0;
}
}
Trc_SHR_CM_sanityWalkROMClassSegment_ExitOK(currentThread);
return 1;
}
/**
* Start up this CacheMap. Should be called after initialization.
* Sets up access to (or creates) the shared cache and registers it as a ROMClassSegment with the vm.
* THREADING: Only ever single threaded
*
* @param [in] currentThread The current thread
* @param [in] piconfig The shared class pre-init config
* @param [in] rootName The name of the cache to connect to
* @param [in] cacheDirName The location of the cache file(s)
* @param [in] cacheMemoryUT Used for unit testing. If provided, cache is built into this buffer.
* @param [out] cacheHasIntegrity Set to true if the cache is new or has been crc integrity checked, false otherwise
*
* @return 0 on success or -1 for failure
*/
IDATA
SH_CacheMap::startup(J9VMThread* currentThread, J9SharedClassPreinitConfig* piconfig, const char* rootName, const char* cacheDirName, UDATA cacheDirPerm, BlockPtr cacheMemoryUT, bool* cacheHasIntegrity)
{
IDATA itemsRead = 0;
IDATA rc = 0;
const char* fnName = "startup";
J9JavaVM* vm = currentThread->javaVM;
IDATA deleteRC = 1;
PORT_ACCESS_FROM_PORT(_portlib);
SH_CompositeCacheImpl* ccToUse = _ccHead;
SH_CompositeCacheImpl* ccNext = NULL;
SH_CompositeCacheImpl* ccPrevious = NULL;
bool isCacheUniqueIdStored = false;
_actualSize = (U_32)piconfig->sharedClassCacheSize;
Trc_SHR_CM_startup_Entry(currentThread, rootName, _actualSize);
if (_sharedClassConfig) {
_runtimeFlags = &(_sharedClassConfig->runtimeFlags);
_verboseFlags = _sharedClassConfig->verboseFlags;
}
_cacheName = rootName; /* Store the original name as the cache name */
_cacheDir = cacheDirName;
if (*_runtimeFlags & J9SHR_RUNTIMEFLAG_ENABLE_READONLY) {
/* If running readonly, we can't recreate a cache after we delete it, so disable autopunt */
*_runtimeFlags &= ~J9SHR_RUNTIMEFLAG_AUTOKILL_DIFF_BUILDID;
}
if (omrthread_monitor_init(&_refreshMutex, 0)) {
CACHEMAP_TRACE(J9SHR_VERBOSEFLAG_ENABLE_VERBOSE_DEFAULT, J9NLS_ERROR, J9NLS_SHRC_CM_FAILED_CREATE_REFRESH_MUTEX);
Trc_SHR_CM_startup_Exit5(currentThread);
return -1;
}
/* _ccHead->startup will set the _actualSize to the real cache size */
_runningNested = ((*_runtimeFlags & J9SHR_RUNTIMEFLAG_ENABLE_NESTED) != 0);
U_32 cacheFileSize = 0;
bool doRetry = false;
U_64* runtimeFlags = _runtimeFlags;
char cacheUniqueID[J9SHR_UNIQUE_CACHE_ID_BUFSIZE];
memset(cacheUniqueID, 0, sizeof(cacheUniqueID));
do {
IDATA tryCntr = 0;
bool isCcHead = (ccToUse == _ccHead);
bool storeToCcHead = (ccPrevious == _ccHead);
const char* cacheUniqueIDPtr = NULL;
/* start up _ccHead (the top layer cache) and then statrt its pre-requiste cache (ccNext). Contine to startup ccNext and its pre-requiste cache, util there is no more pre-requiste cache.
* _ccHead -------------> ccNext ---------> ccNext --------> ........---------> ccTail
* (top layer) (middle layer) (middle layer) ........ (layer 0)
*/
if (!isCcHead) {
runtimeFlags = &_sharedClassConfig->readOnlyCacheRuntimeFlags;
}
do {
++tryCntr;
if ((rc == CC_STARTUP_SOFT_RESET) && (deleteRC == -1)) {
/* If we've tried SOFT_RESET the first time around and the delete failed,
* remove AUTOKILL so that we start up with the existing cache */
*runtimeFlags &= ~J9SHR_RUNTIMEFLAG_AUTOKILL_DIFF_BUILDID;
}
rc = ccToUse->startup(currentThread, piconfig, cacheMemoryUT, runtimeFlags, _verboseFlags, _cacheName, cacheDirName, cacheDirPerm, &_actualSize, &_localCrashCntr, true, cacheHasIntegrity);
if (rc == CC_STARTUP_OK) {
if (sanityWalkROMClassSegment(currentThread, ccToUse) == 0) {
rc = CC_STARTUP_CORRUPT;
goto error;
}
if (!isCcHead) {
if (NULL == appendCacheDescriptorList(currentThread, _sharedClassConfig, ccToUse)) {
CACHEMAP_TRACE(J9SHR_VERBOSEFLAG_ENABLE_VERBOSE_DEFAULT, J9NLS_ERROR, J9NLS_SHRC_CM_FAILED_ALLOC_DESCRIPTOR);
Trc_SHR_CM_startup_Exit12(currentThread);
return -1;
}
}
UDATA idLen = 0;
bool isReadOnly = ccToUse->isRunningReadOnly();
char cacheDirBuf[J9SH_MAXPATH];
U_32 cacheType = J9_ARE_ALL_BITS_SET(*runtimeFlags, J9SHR_RUNTIMEFLAG_ENABLE_PERSISTENT_CACHE) ? J9PORT_SHR_CACHE_TYPE_PERSISTENT : J9PORT_SHR_CACHE_TYPE_NONPERSISTENT;
SH_OSCache::getCacheDir(vm, cacheDirName, cacheDirBuf, J9SH_MAXPATH, cacheType, false);
if (storeToCcHead && !isCacheUniqueIdStored && !ccPrevious->isRunningReadOnly()) {
if (ccPrevious->enterWriteMutex(currentThread, false, fnName) == 0) {
storeCacheUniqueID(currentThread, cacheDirBuf, ccToUse->getCreateTime(), ccToUse->getMetadataBytes(), ccToUse->getClassesBytes(), ccToUse->getLineNumberTableBytes(), ccToUse->getLocalVariableTableBytes(), &cacheUniqueIDPtr, &idLen);
Trc_SHR_Assert_True(idLen < sizeof(cacheUniqueID));
memcpy(cacheUniqueID, cacheUniqueIDPtr, idLen);
cacheUniqueID[idLen] = 0;
ccPrevious->exitWriteMutex(currentThread, fnName);
} else {
CACHEMAP_TRACE(J9SHR_VERBOSEFLAG_ENABLE_VERBOSE_DEFAULT, J9NLS_ERROR, J9NLS_SHRC_CM_FAILED_ENTER_WRITE_MUTEX_STARTUP);
Trc_SHR_CM_startup_Exit7(currentThread);
return -1;
}
}
if (ccToUse->enterWriteMutex(currentThread, false, fnName) == 0) {
if (false == isCcHead) {
if (strlen(cacheUniqueID) > 0) {
if (false == ccToUse->verifyCacheUniqueID(currentThread, cacheUniqueID)) {
/* modification to a low layer cache has been detected */
if (_ccHead->isNewCache()) {
CACHEMAP_TRACE4(J9SHR_VERBOSEFLAG_ENABLE_VERBOSE_DEFAULT, J9NLS_ERROR, J9NLS_SHRC_CM_NEW_LAYER_CACHE_DESTROYED, _ccHead->getLayer(), ccToUse->getLayer(), cacheUniqueID, ccToUse->getCacheUniqueID(currentThread));
_ccHead->deleteCache(currentThread, true);
}
CACHEMAP_TRACE1(J9SHR_VERBOSEFLAG_ENABLE_VERBOSE_DEFAULT, J9NLS_ERROR, J9NLS_SHRC_CM_VERIFY_CACHE_ID_FAILED, cacheUniqueID);
ccToUse->exitWriteMutex(currentThread, fnName);
Trc_SHR_CM_startup_Exit8(currentThread);
return -1;
}
}
}
if (J9_ARE_ANY_BITS_SET(*runtimeFlags, J9SHR_RUNTIMEFLAG_ENABLE_REDUCE_STORE_CONTENTION) && !isReadOnly) {
ccToUse->setWriteHash(currentThread, 0); /* Initialize to zero so that peek will work */
}
IDATA preqRC = getPrereqCache(currentThread, cacheDirBuf, ccToUse, false, &cacheUniqueIDPtr, &idLen, &isCacheUniqueIdStored);
if (0 > preqRC) {
if (CM_CACHE_CORRUPT == preqRC) {
rc = CC_STARTUP_CORRUPT;
SH_Managers::ManagerWalkState state;
SH_Manager* walkManager = managers()->startDo(currentThread, 0, &state);
while (walkManager) {
walkManager->cleanup(currentThread);
walkManager = managers()->nextDo(&state);
}
}
CACHEMAP_TRACE(J9SHR_VERBOSEFLAG_ENABLE_VERBOSE_DEFAULT, J9NLS_ERROR, J9NLS_SHRC_CM_GET_PREREQ_CACHE_FAILED);
ccToUse->exitWriteMutex(currentThread, fnName);
Trc_SHR_CM_startup_Exit9(currentThread, preqRC);
return -1;
} else if (1 == preqRC) {
UDATA reqBytes = SH_CompositeCacheImpl::getRequiredConstrBytesWithCommonInfo(false, false);
SH_CompositeCacheImpl* allocPtr = (SH_CompositeCacheImpl*)j9mem_allocate_memory(reqBytes, J9MEM_CATEGORY_CLASSES);
if (NULL == allocPtr) {
ccToUse->exitWriteMutex(currentThread, fnName);
CACHEMAP_TRACE1(J9SHR_VERBOSEFLAG_ENABLE_VERBOSE_DEFAULT, J9NLS_ERROR, J9NLS_SHRC_CM_MEMORY_ALLOC_FAILED, reqBytes);
Trc_SHR_CM_startup_Exit10(currentThread);
return -1;
}
if (0 == _sharedClassConfig->readOnlyCacheRuntimeFlags) {
_sharedClassConfig->readOnlyCacheRuntimeFlags = (_sharedClassConfig->runtimeFlags | J9SHR_RUNTIMEFLAG_ENABLE_READONLY);
_sharedClassConfig->readOnlyCacheRuntimeFlags &= ~J9SHR_RUNTIMEFLAG_AUTOKILL_DIFF_BUILDID;
_readOnlyCacheRuntimeFlags = &_sharedClassConfig->readOnlyCacheRuntimeFlags;
}
I_8 preLayer = 0;
const char* cacheName = _cacheName;
char cacheNameBuf[USER_SPECIFIED_CACHE_NAME_MAXLEN];
if (isCacheUniqueIdStored) {
Trc_SHR_Assert_True(idLen < sizeof(cacheUniqueID));
memcpy(cacheUniqueID, cacheUniqueIDPtr, idLen);
cacheUniqueID[idLen] = 0;
SH_OSCache::getCacheNameAndLayerFromUnqiueID(vm, cacheUniqueID, idLen, cacheNameBuf, USER_SPECIFIED_CACHE_NAME_MAXLEN, &preLayer);
cacheName = cacheNameBuf;
} else {
/**
* The CacheUniqueID of the pre-requisite cache is not stored when a new layer of cache is created (using createLayer or layer=<num> option).
* Thus, we get the CacheUniqueID of the current cache and decrement the layer number by 1 to get the cacheName and layer number of the pre-requisite cache.
*/
preLayer = _sharedClassConfig->layer - 1;
}
ccNext = SH_CompositeCacheImpl::newInstance(vm, _sharedClassConfig, allocPtr, cacheName, cacheType, false, preLayer);
ccNext->setNext(NULL);
ccNext->setPrevious(ccToUse);
ccToUse->setNext(ccNext);
ccPrevious = ccToUse;
_ccTail = ccNext;
} else {
/* no prereq cache, do nothing */
}
ccToUse->exitWriteMutex(currentThread, fnName);
} else {
CACHEMAP_TRACE(J9SHR_VERBOSEFLAG_ENABLE_VERBOSE_DEFAULT, J9NLS_ERROR, J9NLS_SHRC_CM_FAILED_ENTER_WRITE_MUTEX_STARTUP);
Trc_SHR_CM_startup_Exit7(currentThread);
return -1;
}
}
error:
if (CC_STARTUP_OK != rc) {
if (isCcHead) {
cacheFileSize = _ccHead->getTotalSize();
}
handleStartupError(currentThread, ccToUse, rc, *runtimeFlags, _verboseFlags, &doRetry, &deleteRC);
if (isCcHead && doRetry) {
if (cacheFileSize > 0) {
/* If we're recreating, make the new cache the same size as the old
* Cache may be corrupt, so don't rely on values in the cache header to determine size */
piconfig->sharedClassCacheSize = cacheFileSize;
}
}
}
} while (doRetry && (tryCntr < 2));
ccToUse = ccToUse->getNext();
} while (NULL != ccToUse && CC_STARTUP_OK == rc);
if (CC_STARTUP_OK != rc) {
CACHEMAP_TRACE(J9SHR_VERBOSEFLAG_ENABLE_VERBOSE_DEFAULT, J9NLS_ERROR, J9NLS_SHRC_CM_FAILED_TO_START_UP);
Trc_SHR_CM_startup_Exit11(currentThread);
if (CC_STARTUP_NO_CACHE == rc) {
return -2;
}
return rc;
}
setCacheAddressRangeArray();
ccToUse = _ccTail;
if (J9_ARE_ALL_BITS_SET(*runtimeFlags, J9SHR_RUNTIMEFLAG_ENABLE_STATS)) {
if (UnitTest::CORRUPT_CACHE_TEST != UnitTest::unitTest) {
Trc_SHR_Assert_True(J9_ARE_ALL_BITS_SET(*runtimeFlags, J9SHR_RUNTIMEFLAG_ENABLE_READONLY));
}
if (J9_ARE_ALL_BITS_SET(vm->sharedCacheAPI->printStatsOptions, PRINTSTATS_SHOW_TOP_LAYER_ONLY)) {
ccToUse = _ccHead;
}
}
do {
if (ccToUse == _ccHead) {
runtimeFlags = _runtimeFlags;
} else {
runtimeFlags = _readOnlyCacheRuntimeFlags;
}
bool isReadOnly = ccToUse->isRunningReadOnly();
/* THREADING: We want the cache mutex here as we are reading all available data. Don't want updates happening as we read. */
if (ccToUse->enterWriteMutex(currentThread, false, fnName) == 0) {
/* populate the hashtables */
itemsRead = readCache(currentThread, ccToUse, -1, false);
ccToUse->protectPartiallyFilledPages(currentThread);
/* Two reasons for moving the code to check for full cache from SH_CompositeCacheImpl::startup()
* to SH_CacheMap::startup():
* - While marking cache full, last unsused pages are also protected, which ideally should be done
* after protecting pages belonging to ROMClass area and metadata area.
* - Secondly, when setting cache full flags, the code expects to be holding the write mutex, which is not done in
* SH_CompositeCacheImpl::startup().
*
* Do not call fillCacheIfNearlyFull() in readonly mode, as we cannot write anything to cache.
*/
if (J9_ARE_NO_BITS_SET(*runtimeFlags, J9SHR_RUNTIMEFLAG_ENABLE_NESTED)
&& (!isReadOnly)
) {
ccToUse->fillCacheIfNearlyFull(currentThread);
}
ccToUse->exitWriteMutex(currentThread, fnName);
if (CM_READ_CACHE_FAILED == itemsRead) {
Trc_SHR_CM_startup_Exit6(currentThread);
return -1;
}
if (CM_CACHE_CORRUPT == itemsRead) {
Trc_SHR_CM_startup_Exit13(currentThread);
rc = CC_STARTUP_CORRUPT;
SH_Managers::ManagerWalkState state;
SH_Manager* walkManager = managers()->startDo(currentThread, 0, &state);
while (walkManager) {
walkManager->cleanup(currentThread);
walkManager = managers()->nextDo(&state);
}
}
} else {
CACHEMAP_TRACE(J9SHR_VERBOSEFLAG_ENABLE_VERBOSE_DEFAULT, J9NLS_ERROR, J9NLS_SHRC_CM_FAILED_ENTER_WRITE_MUTEX_STARTUP);
Trc_SHR_CM_startup_Exit7(currentThread);
return -1;
}
if (CC_STARTUP_OK == rc) {
if (isReadOnly) {
*runtimeFlags |= J9SHR_RUNTIMEFLAG_ENABLE_READONLY;
/* If running read-only, treat the cache as full */
ccToUse->markReadOnlyCacheFull();
}
}
ccToUse = ccToUse->getPrevious();
} while (NULL != ccToUse && CC_STARTUP_OK == rc);
if (rc != CC_STARTUP_OK) {
handleStartupError(currentThread, ccToUse, rc, *runtimeFlags, _verboseFlags, &doRetry, &deleteRC);
Trc_SHR_CM_startup_Exit1(currentThread);
return -1;
}
if (!initializeROMSegmentList(currentThread)) {
CACHEMAP_TRACE(J9SHR_VERBOSEFLAG_ENABLE_VERBOSE_DEFAULT, J9NLS_ERROR, J9NLS_SHRC_CM_FAILED_CREATE_ROMIMAGE);
Trc_SHR_CM_startup_Exit4(currentThread);
return -1;
}
#if defined(J9SHR_CACHELET_SUPPORT)
/* readCache() updates the segment list if it reads in a cachelet */
enterLocalMutex(currentThread, currentThread->javaVM->classMemorySegments->segmentMutex, "class segment mutex", "CM startup");
/* THREADING: We want the cache mutex here as we are reading all available data. Don't want updates happening as we read. */
if (_ccHead->enterWriteMutex(currentThread, false, fnName)==0) {
/* populate the hashtables */
itemsRead = readCache(currentThread, _ccHead, -1, false);
_ccHead->exitWriteMutex(currentThread, fnName);
exitLocalMutex(currentThread, currentThread->javaVM->classMemorySegments->segmentMutex, "class segment mutex", "CM startup");
if (CM_READ_CACHE_FAILED == itemsRead) {
Trc_SHR_CM_startup_Exit6(currentThread);
return -1;
}
if (CM_CACHE_CORRUPT == itemsRead) {
reportCorruptCache(currentThread, _ccHead);
Trc_SHR_CM_startup_Exit6(currentThread);
return -1;
}
/* CMVC 160728:
* Calling 'updateROMSegmentList()' here when J9SHR_CACHELET_SUPPORT is defined caused
* the below assert to fail intermittently in SH_CompositeCacheImpl::countROMSegments().
*
* Trc_SHR_Assert_False((segment->baseAddress < getBaseAddress()) ||
* (segment->heapTop > getCacheLastEffectiveAddress()));
*
* The assert fails because when looking up a segment in 'javaVM->classMemorySegments->avlTreeData'
* because a segment for the 'whole cache' was returned instead of the expected 'cachelet'. If the VM gets
* beyond this assert bad metadata can be written to the cache during VM shutdown (e.g. because
* the trace point is level 10, and fatal asserts are disabled, in some branches).
*
* Not calling 'updateROMSegmentList()' ensures a segment for the 'whole cache' is never added.
*
* Before this change there were 2 situations where 'updateROMSegmentList()' was called.
* 1.) With an empty cache
* 2.) With a cache containing data
*
* The 1st case is the one that caused the problem/defect. In this case a segment for the 'whole cache' is added
* to the JVM because _cacheletHead == NULL, and _cc is started.
*
* The 2nd case is simply an optimization. In this case the call to 'updateROMSegmentList()' does no
* work because cacheletHead != NULL, and cacheletHead is NOT started.
*
* CMVC 189626: Not calling updateROMSegmentList in 2nd case causes incorrect behavior
* when the existing cache is non-reatlime.
* Therefore the fix has been updated such that 'updateROMSegmentList()' is called when
* using existing cache (i.e. _runningNested is false) and the cache is non-realtime (no cachelets are present).
*
* When J9SHR_CACHELET_SUPPORT is defined, and we are creating a new cache, it should be noted
* that updateROMSegmentList() is still called elsewhere. Specifically it is called when the
* first shared class transaction calls, SH_CacheMap::commitROMClass() via
* j9shr_classStoreTransaction_stop().
*/
if ((false == _runningNested) && (false == _ccHead->getContainsCachelets())) {
#endif /*J9SHR_CACHELET_SUPPORT*/
updateROMSegmentList(currentThread, false, false);
#if defined(J9SHR_CACHELET_SUPPORT)
}
} else {
CACHEMAP_TRACE(J9SHR_VERBOSEFLAG_ENABLE_VERBOSE_DEFAULT, J9NLS_ERROR, J9NLS_SHRC_CM_FAILED_ENTER_WRITE_MUTEX_STARTUP);
Trc_SHR_CM_startup_Exit7(currentThread);
return -1;
}
#endif
Trc_SHR_CM_startup_ExitOK(currentThread);
return 0;
}
/**
* Handle the SH_CompositeCacheImpl start up error
*
* @param [in] currentThread The current thread
* @param [in] ccToUse The SH_CompositeCacheImpl that was being started up
* @param [in] errorCode The SH_CompositeCacheImpl startup error code
* @param [in] runtimeFlags The runtime flags
* @param [in] verboseFlags Flags controlling the verbose output
* @param [out] doRetry Whether to retry starting up the cache
* @param [out] deleteRC 0 if cache is successful deleted, -1 otherwise.
*/
void
SH_CacheMap::handleStartupError(J9VMThread* currentThread, SH_CompositeCacheImpl* ccToUse, IDATA errorCode, U_64 runtimeFlags, UDATA verboseFlags, bool *doRetry, IDATA *deleteRC)
{
PORT_ACCESS_FROM_VMC(currentThread);
if (errorCode == CC_STARTUP_CORRUPT) {
reportCorruptCache(currentThread, ccToUse);
}
if (errorCode == CC_STARTUP_NO_CACHELETS) {
CACHEMAP_PRINT1(J9NLS_ERROR, J9NLS_SHRC_CM_NESTED_WITHOUT_CACHELETS, ccToUse->getCacheName());
}
if (J9_ARE_NO_BITS_SET(runtimeFlags, J9SHR_RUNTIMEFLAG_ENABLE_STATS | J9SHR_RUNTIMEFLAG_FAKE_CORRUPTION)
&& (false == ccToUse->isRunningReadOnly())
) {
/* If the cache is readonly do not delete it or call cleanup().
* Cleanup is already called during j9shr_shutdown().
* Destroy and clean up only are needed if a 2nd cache is to be opened.
*
* If the cache is being opened to display stats then do not delete it.
*/
if ((errorCode == CC_STARTUP_CORRUPT) || (errorCode == CC_STARTUP_RESET) || (errorCode == CC_STARTUP_SOFT_RESET)) {
/* If SOFT_RESET, suppress verbose unless "verbose" is explicitly set
* This will ensure that if the VM can't destroy the cache, we don't get unwanted error messages */
*deleteRC = ccToUse->deleteCache(currentThread, (errorCode == CC_STARTUP_SOFT_RESET) && !(verboseFlags & J9SHR_VERBOSEFLAG_ENABLE_VERBOSE));
ccToUse->cleanup(currentThread);
if (0 == *deleteRC) {
if (errorCode == CC_STARTUP_CORRUPT) {
/* Recovering from a corrupted cache, clear the flags which prevent access */
resetCorruptState(currentThread, FALSE);
}
}
if (J9_ARE_NO_BITS_SET(runtimeFlags, J9SHR_RUNTIMEFLAG_RESTORE_CHECK)) {
/* If the restored cache is corrupted, return CC_STARTUP_CORRUPT and do not retry,
* as retry will create another empty cache that is not restored from the snapshot
*/
if ((0 == *deleteRC) || (errorCode == CC_STARTUP_SOFT_RESET)) {
/* If we deleted the cache, or in the case of SOFT_RESET, even if we failed to delete the cache, retry */
Trc_SHR_Assert_True(ccToUse == _ccHead);
*doRetry = true;
}
}
}
}
}
/* Assume cc is initialized OK */
/* THREADING: Only ever single threaded */
/* Creates a new ROMClass memory segment and adds it to the avl tree */
J9MemorySegment*
SH_CacheMap::addNewROMImageSegment(J9VMThread* currentThread, U_8* segmentBase, U_8* segmentEnd)
{
J9MemorySegment* romSegment = NULL;
J9JavaVM* vm = currentThread->javaVM;
UDATA type = MEMORY_TYPE_ROM_CLASS | MEMORY_TYPE_ROM | MEMORY_TYPE_FIXEDSIZE;
Trc_SHR_CM_addNewROMImageSegment_Entry(currentThread, segmentBase, segmentEnd);
if ((romSegment = createNewSegment(currentThread, type, vm->classMemorySegments, segmentBase, segmentBase, segmentEnd, segmentBase)) != NULL) {
avl_insert(&vm->classMemorySegments->avlTreeData, (J9AVLTreeNode *) romSegment);
}
Trc_SHR_CM_addNewROMImageSegment_Exit(currentThread, romSegment);
return romSegment;
}
J9MemorySegment*
SH_CacheMap::createNewSegment(J9VMThread* currentThread, UDATA type, J9MemorySegmentList* segmentList,
U_8* baseAddress, U_8* heapBase, U_8* heapTop, U_8* heapAlloc)
{
J9MemorySegment* romSegment = NULL;
J9JavaVM* vm = currentThread->javaVM;
Trc_SHR_CM_createNewSegment_Entry(currentThread, type, segmentList, baseAddress, heapBase, heapTop, heapAlloc);
if ((romSegment = vm->internalVMFunctions->allocateMemorySegmentListEntry(segmentList)) != NULL) {
romSegment->type = type;
romSegment->size = (heapTop - baseAddress);
romSegment->baseAddress = baseAddress;
romSegment->heapBase = heapBase;
romSegment->heapTop = heapTop;
romSegment->heapAlloc = heapAlloc;
romSegment->classLoader = vm->systemClassLoader;
}
Trc_SHR_CM_createNewSegment_Exit(currentThread, romSegment);
return romSegment;
}
/**
* Updates the heapAlloc of the current ROMClass segment and creates a new segment if this is required.
* Should be called whenever a cache update has occurred or after a ROMClass has been added to the cache
* THREADING: The only time that hasClassSegmentMutex can be false is if the caller does not hold the write mutex
* storeROMClass prereq that the class segment mutex is held.
* Therefore, we can enter the write mutex if we have the class segment mutex, but NOT vice-versa.
*
* @param [in] currentThread The current thread
* @param [in] hasClassSegmentMutex Whether the currrent thread has ClassSegmentMutex
* @param [in] topLayerOnly Whether update romClass segment for top layer cache only
*/
void
SH_CacheMap::updateROMSegmentList(J9VMThread* currentThread, bool hasClassSegmentMutex, bool topLayerOnly)
{
SH_CompositeCacheImpl* cache = _ccHead;
#if defined(J9VM_THR_PREEMPTIVE)
omrthread_monitor_t classSegmentMutex = currentThread->javaVM->classMemorySegments->segmentMutex;
#endif
#if defined(J9VM_THR_PREEMPTIVE)
if (!hasClassSegmentMutex) {
Trc_SHR_Assert_ShouldNotHaveLocalMutex(classSegmentMutex);
Trc_SHR_Assert_False(_ccHead->hasWriteMutex(currentThread));
Trc_SHR_Assert_False(_ccHead->hasReadMutex(currentThread));
enterLocalMutex(currentThread, classSegmentMutex, "class segment mutex", "updateROMSegmentList");
} else {
Trc_SHR_Assert_ShouldHaveLocalMutex(classSegmentMutex);
}
#endif
while (cache) {
if (cache->isStarted()) {
updateROMSegmentListForCache(currentThread, cache);
}
if (topLayerOnly) {
break;
}
cache = cache->getNext();
}
#if defined(J9VM_THR_PREEMPTIVE)
if (!hasClassSegmentMutex) {
exitLocalMutex(currentThread, classSegmentMutex, "class segment mutex", "updateROMSegmentList");
}
#endif
}
/**
* THREADING: Should have class segment mutex
* @param[in] forCache The current supercache, if there are no cachelets. A started cachelet, otherwise.
*/
void
SH_CacheMap::updateROMSegmentListForCache(J9VMThread* currentThread, SH_CompositeCacheImpl* forCache)
{
J9JavaVM* vm = currentThread->javaVM;
U_8 *currentSegAlloc, *cacheAlloc;
J9MemorySegment* currentSegment = forCache->getCurrentROMSegment();
PORT_ACCESS_FROM_PORT(_portlib);
Trc_SHR_CM_updateROMSegmentList_Entry(currentThread, currentSegment);
/* TODO: I think we need a pass/fail return value from this */
if (currentSegment == NULL) {
if ((currentSegment = addNewROMImageSegment(currentThread, (U_8*)forCache->getBaseAddress(), (U_8*)forCache->getCacheLastEffectiveAddress())) == NULL) {
Trc_SHR_CM_updateROMSegmentList_addFirstSegmentFailed(currentThread, forCache, forCache->getBaseAddress(), forCache->getCacheLastEffectiveAddress());
return;
}
forCache->setCurrentROMSegment(currentSegment);
}
currentSegAlloc = currentSegment->heapAlloc;
cacheAlloc = (U_8*)forCache->getSegmentAllocPtr();
/* If there is a cache update which is not reflected in the current ROMClass segment... */
if (currentSegAlloc < cacheAlloc) {
U_8* currentROMClass = currentSegAlloc;
UDATA currentSegSize = currentSegment->heapAlloc - currentSegment->heapBase;
UDATA maxSegmentSize = vm->romClassAllocationIncrement;
/* Walk ROMClasses to the limit of cacheAlloc */
while (currentROMClass < cacheAlloc) {
UDATA currentROMSize = ((J9ROMClass*)currentROMClass)->romSize;
/* If the current segment is about to become too large, try to create a new one */
if ((currentSegSize + currentROMSize) > maxSegmentSize) {
J9MemorySegment* newSegment;