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OSCache.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
*******************************************************************************/
/**
* @file
* @ingroup Shared_Common
*/
#include <string.h>
#include "j9cfg.h"
#include "j9port.h"
#include "pool_api.h"
#include "j9shrnls.h"
#include "util_api.h"
#include "j2sever.h"
#include "shrinit.h"
#include "j9version.h"
#include "shchelp.h"
#include "OSCachesysv.hpp"
#include "OSCachemmap.hpp"
#if defined(J9SHR_CACHELET_SUPPORT)
#include "OSCachevmem.hpp"
#endif /* J9SHR_CACHELET_SUPPORT */
#include "CacheMap.hpp"
/**
* Function which builds a cache filename from a cache name, version data and generation.
* A cache file name is currently a composite of the cache name with a version prefix and generation postfix
* Note that the function returns different results for Windows and Unix.
*
* @param [in] portlib A portLibrary
* @param [out] buffer The buffer to write the filename into
* @param [in] bufferSize The size of the buffer in bytes
* @param [in] cacheName The name of the cache
* @param [in] versionData The version information for the cache
* @param [in] generation The generation
* @param [in] isMemoryType True if the file is a shared memory control file, false if for a semaphore
* @param [in] layer The shared cache layer number.
*/
void
SH_OSCache::getCacheVersionAndGen(J9PortLibrary* portlib, J9JavaVM* vm, char* buffer, UDATA bufferSize, const char* cacheName,
J9PortShcVersion* versionData, UDATA generation, bool isMemoryType, I_8 layer)
{
char genString[7];
char versionStr[J9SH_VERSION_STRING_LEN+3];
UDATA versionStrLen = 0;
PORT_ACCESS_FROM_PORT(portlib);
Trc_SHR_OSC_getCacheVersionAndGen_Entry_V1(cacheName, generation, layer);
memset(versionStr, 0, J9SH_VERSION_STRING_LEN+1);
if (generation <= J9SH_GENERATION_07) {
J9SH_GET_VERSION_G07ANDLOWER_STRING(PORTLIB, versionStr, J9SH_VERSION(versionData->esVersionMajor, versionData->esVersionMinor), versionData->modlevel, versionData->addrmode);
} else {
U_64 curVMVersion = 0;
U_64 oldVMVersion = 0;
/* CMVC 163957:
* There is overlap Java 6 cache file generations and Java 7. For example:
* - Java 6 SR8: C240D2A64P_java6sr8_G08
* - Java 7 CVS HEAD: C260M3A64P_cvshead_G08
*
* If we use any thing older than Major=2, and Minor=60 we must use J9SH_GET_VERSION_G07ANDLOWER_STRING to get the file name.
*
* When called b/c of '-Xshareclasses:listAllCaches' if the wrong cache name is used the cache will fail to be started, and will
* not be listed.
*/
oldVMVersion = SH_OSCache::getCacheVersionToU64(2, 60);
curVMVersion = SH_OSCache::getCacheVersionToU64(versionData->esVersionMajor, versionData->esVersionMinor);
if ( curVMVersion >= oldVMVersion) {
if (generation <= J9SH_GENERATION_29) {
J9SH_GET_VERSION_G07TO29_STRING(PORTLIB, versionStr, J9SH_VERSION(versionData->esVersionMajor, versionData->esVersionMinor), versionData->modlevel, versionData->addrmode);
} else if (versionData->modlevel < 10) {
J9SH_GET_VERSION_STRING_JAVA9ANDLOWER(PORTLIB, versionStr, J9SH_VERSION(versionData->esVersionMajor, versionData->esVersionMinor), versionData->modlevel, versionData->feature, versionData->addrmode);
} else {
J9SH_GET_VERSION_STRING(PORTLIB, versionStr, J9SH_VERSION(versionData->esVersionMajor, versionData->esVersionMinor), versionData->modlevel, versionData->feature, versionData->addrmode);
}
} else {
J9SH_GET_VERSION_G07ANDLOWER_STRING(PORTLIB, versionStr, J9SH_VERSION(versionData->esVersionMajor, versionData->esVersionMinor), versionData->modlevel, versionData->addrmode);
}
}
versionStrLen = strlen(versionStr);
if (J9PORT_SHR_CACHE_TYPE_PERSISTENT == versionData->cacheType) {
versionStr[versionStrLen] = J9SH_PERSISTENT_PREFIX_CHAR;
} else if (J9PORT_SHR_CACHE_TYPE_SNAPSHOT == versionData->cacheType) {
versionStr[versionStrLen] = J9SH_SNAPSHOT_PREFIX_CHAR;
}
if (generation <= J9SH_GENERATION_37) {
j9str_printf(PORTLIB, genString, 4, "G%02d", generation);
} else {
Trc_SHR_Assert_True(
((0 <= layer) && (layer <= J9SH_LAYER_NUM_MAX_VALUE))
|| (J9SH_LAYER_NUM_UNSET == layer)
);
j9str_printf(PORTLIB, genString, 7, "G%02dL%02d", generation, layer);
}
#if defined(WIN32)
j9str_printf(PORTLIB, buffer, bufferSize, "%s%c%s%c%s", versionStr, J9SH_PREFIX_SEPARATOR_CHAR, cacheName, J9SH_PREFIX_SEPARATOR_CHAR, genString);
#else
/* In either case we avoid attaching the "_memory_" or "_semaphore_" substring. */
if ((J9PORT_SHR_CACHE_TYPE_PERSISTENT == versionData->cacheType)
|| (J9PORT_SHR_CACHE_TYPE_SNAPSHOT == versionData->cacheType)
|| (J9PORT_SHR_CACHE_TYPE_CROSSGUEST == versionData->cacheType)
) {
j9str_printf(PORTLIB, buffer, bufferSize, "%s%c%s%c%s", versionStr, J9SH_PREFIX_SEPARATOR_CHAR, cacheName, J9SH_PREFIX_SEPARATOR_CHAR, genString);
} else {
const char* identifier = isMemoryType ? J9SH_MEMORY_ID : J9SH_SEMAPHORE_ID;
j9str_printf(PORTLIB, buffer, bufferSize, "%s%s%s%c%s", versionStr, identifier, cacheName, J9SH_PREFIX_SEPARATOR_CHAR, genString);
}
#endif
Trc_SHR_OSC_getCacheVersionAndGen_Exit(buffer);
}
/**
* Extract the cache name from a filename of the format created by getCacheVersionAndGen
*
* @param [out] buffer Buffer to extract the cache name into
* @param [in] bufferSize The size of the buffer in bytes
* @param [in] versionLen Length of the version prefix (is variable for different types of cache)
* @param [in] cacheNameWithVGen The filename to extract the name from
*
* @return 0 on success or -1 for failure
*/
IDATA
SH_OSCache::removeCacheVersionAndGen(char* buffer, UDATA bufferSize, UDATA versionLen, const char* cacheNameWithVGen)
{
char* nameStart;
UDATA lengthMinusGenAndLayer = 0;
UDATA generation = getGenerationFromName(cacheNameWithVGen);
Trc_SHR_OSC_removeCacheVersionAndGen_Entry(versionLen, cacheNameWithVGen);
/*
* cache names generated by earlier JVMs (generation <=29) don't have feature prefix char 'F' and the value
* adjust versionLen to parse cacheNameWithVGen generated by earlier JVMs according to generation number
*/
if (generation <= J9SH_GENERATION_29) {
versionLen -= J9SH_VERSTRLEN_INCREASED_SINCEG29;
}
/* modLevel becomes 2 digits from Java 10 */
if (getModLevelFromName(cacheNameWithVGen) < 10) {
versionLen -= J9SH_VERSTRLEN_INCREASED_SINCEJAVA10;
}
nameStart = (char*)(cacheNameWithVGen + versionLen);
if (generation <= J9SH_GENERATION_37) {
lengthMinusGenAndLayer = strlen(nameStart) - strlen("_GXX");
} else {
lengthMinusGenAndLayer = strlen(nameStart) - strlen("_GXXLXX");
}
if (lengthMinusGenAndLayer >= bufferSize) {
Trc_SHR_OSC_removeCacheVersionAndGen_overflow();
return -1;
}
strncpy(buffer, nameStart, lengthMinusGenAndLayer);
buffer[lengthMinusGenAndLayer] = '\0';
Trc_SHR_OSC_removeCacheVersionAndGen_Exit();
return 0;
}
/**
* Determine the directory to use for the cache file or control file(s)
*
* @param [in] vm A J9JavaVM
* @param [in] ctrlDirName The control dir name
* @param [out] buffer The buffer to write the result into
* @param [in] bufferSize The size of the buffer in bytes
* @param [in] cacheType The Type of cache
* @param [in] allowVerbose Whether to allow verbose message.
*
* @return 0 on success or -1 for failure
*/
IDATA
SH_OSCache::getCacheDir(J9JavaVM* vm, const char* ctrlDirName, char* buffer, UDATA bufferSize, U_32 cacheType, bool allowVerbose)
{
PORT_ACCESS_FROM_JAVAVM(vm);
IDATA rc;
BOOLEAN appendBaseDir;
U_32 flags = 0;
Trc_SHR_OSC_getCacheDir_Entry();
/* Cache directory used is the j9shmem dir, regardless of whether we're using j9shmem or j9mmap */
appendBaseDir = (NULL == ctrlDirName) || (J9PORT_SHR_CACHE_TYPE_NONPERSISTENT == cacheType) || (J9PORT_SHR_CACHE_TYPE_SNAPSHOT == cacheType);
if (appendBaseDir) {
flags |= J9SHMEM_GETDIR_APPEND_BASEDIR;
}
#if defined(OPENJ9_BUILD)
if ((NULL == ctrlDirName)
&& J9_ARE_NO_BITS_SET(vm->sharedCacheAPI->runtimeFlags, J9SHR_RUNTIMEFLAG_ENABLE_GROUP_ACCESS)
) {
/* j9shmem_getDir() always tries the CSIDL_LOCAL_APPDATA directory (C:\Documents and Settings\username\Local Settings\Application Data)
* first on Windows if ctrlDirName is NULL, regardless of whether J9SHMEM_GETDIR_USE_USERHOME is set or not. So J9SHMEM_GETDIR_USE_USERHOME is effective on UNIX only.
*/
flags |= J9SHMEM_GETDIR_USE_USERHOME;
}
#endif /*defined(OPENJ9_BUILD) */
rc = j9shmem_getDir(ctrlDirName, flags, buffer, bufferSize);
if (rc < 0) {
if (allowVerbose
&& J9_ARE_ANY_BITS_SET(vm->sharedCacheAPI->verboseFlags, J9SHR_VERBOSEFLAG_ENABLE_VERBOSE_DEFAULT | J9SHR_VERBOSEFLAG_ENABLE_VERBOSE)
) {
switch(rc) {
case J9PORT_ERROR_SHMEM_GET_DIR_BUF_OVERFLOW:
j9nls_printf(PORTLIB, J9NLS_ERROR, J9NLS_SHRC_GET_DIR_BUF_OVERFLOW);
break;
case J9PORT_ERROR_SHMEM_GET_DIR_FAILED_TO_GET_HOME:
j9nls_printf(PORTLIB, J9NLS_ERROR, J9NLS_SHRC_GET_DIR_FAILED_TO_GET_HOME);
break;
case J9PORT_ERROR_SHMEM_GET_DIR_HOME_BUF_OVERFLOW:
j9nls_printf(PORTLIB, J9NLS_ERROR, J9NLS_SHRC_GET_DIR_HOME_BUF_OVERFLOW);
break;
case J9PORT_ERROR_SHMEM_GET_DIR_HOME_ON_NFS:
j9nls_printf(PORTLIB, J9NLS_ERROR, J9NLS_SHRC_GET_DIR_HOME_ON_NFS);
break;
case J9PORT_ERROR_SHMEM_GET_DIR_CANNOT_STAT_HOME:
j9nls_printf(PORTLIB, J9NLS_ERROR, J9NLS_SHRC_GET_DIR_CANNOT_STAT_HOME, j9error_last_error_number());
break;
case J9PORT_ERROR_SHMEM_NOSPACE:
j9nls_printf(PORTLIB, J9NLS_ERROR, J9NLS_SHRC_GET_DIR_NO_SPACE);
break;
default:
break;
}
}
Trc_SHR_OSC_getCacheDir_j9shmem_getDir_failed1(ctrlDirName);
return -1;
}
Trc_SHR_OSC_getCacheDir_Exit();
return 0;
}
/**
* Create the directory to use for the cache file or control file(s)
*
* @param [in] portLibrary A portLibrary
* @param[in] cacheDirName The name of the cache directory
* @param[in] cleanMemorySegments set TRUE to call cleanSharedMemorySegments. It will clean sysv memory segments.
* It should be set to TRUE if the ctrlDirName is NULL.
*
* Returns -1 for error, >=0 for success
*/
IDATA
SH_OSCache::createCacheDir(J9PortLibrary* portLibrary, char* cacheDirName, UDATA cacheDirPerm, bool cleanMemorySegments)
{
PORT_ACCESS_FROM_PORT(portLibrary);
IDATA rc;
Trc_SHR_OSC_createCacheDir_Entry(cacheDirName, cleanMemorySegments);
rc = j9shmem_createDir(cacheDirName, cacheDirPerm, cleanMemorySegments);
Trc_SHR_OSC_createCacheDir_Exit();
return rc;
}
/* Returns the full path of a cache based on the current cacheDir value */
IDATA
SH_OSCache::getCachePathName(J9PortLibrary* portLibrary, const char* cacheDirName, char* buffer, UDATA bufferSize, const char* cacheNameWithVGen)
{
PORT_ACCESS_FROM_PORT(portLibrary);
Trc_SHR_OSC_getCachePathName_Entry(cacheNameWithVGen);
j9str_printf(PORTLIB, buffer, bufferSize, "%s%s", cacheDirName, cacheNameWithVGen);
Trc_SHR_OSC_getCachePathName_Exit();
return 0;
}
/**
* Stat to see if a named cache exists
*
* @param [in] portLibrary A portLibrary
* @param [in] cacheNameWithVGen The cache filename
* @param [in] displayNotFoundMsg If true, message is displayed if the cache is not found
*
* @return 1 if the cache exists and 0 otherwise
*/
UDATA
SH_OSCache::statCache(J9PortLibrary* portLibrary, const char* cacheDirName, const char* cacheNameWithVGen, bool displayNotFoundMsg)
{
PORT_ACCESS_FROM_PORT(portLibrary);
char fullPath[J9SH_MAXPATH];
Trc_SHR_OSC_statCache_Entry(cacheNameWithVGen);
j9str_printf(PORTLIB, fullPath, J9SH_MAXPATH, "%s%s", cacheDirName, cacheNameWithVGen);
if (j9file_attr(fullPath) == EsIsFile) {
Trc_SHR_OSC_statCache_cacheFound();
return 1;
}
if (displayNotFoundMsg) {
j9nls_printf(PORTLIB, J9NLS_ERROR, J9NLS_SHRC_OSCACHE_NOT_EXIST);
}
Trc_SHR_OSC_statCache_cacheNotFound();
return 0;
}
/* Returns the value of the generation from the cache filename */
UDATA
SH_OSCache::getGenerationFromName(const char* cacheNameWithVGen)
{
char* cursor = (char*)cacheNameWithVGen;
UDATA genValue;
if ((cursor = strrchr(cursor, J9SH_PREFIX_SEPARATOR_CHAR)) == NULL) {
return 0;
}
if (cursor[1] != 'G') {
return 0;
}
cursor += strlen("_G");
scan_udata(&cursor, &genValue);
return genValue;
}
/* Common startup function used by all OSCache subclasses - sets up the common class variables */
IDATA
SH_OSCache::commonStartup(J9JavaVM* vm, const char* ctrlDirName, UDATA cacheDirPerm, const char* cacheName, J9SharedClassPreinitConfig* piconfig, UDATA createFlag, UDATA verboseFlags, U_64 runtimeFlags, I_32 openMode, J9PortShcVersion* versionData)
{
PORT_ACCESS_FROM_PORT(_portLibrary);
UDATA cacheNameLen = 0;
UDATA cachePathNameLen = 0;
UDATA versionStrLen = 0;
char fullPathName[J9SH_MAXPATH];
Trc_SHR_OSC_commonStartup_Entry();
_config = piconfig;
_verboseFlags = verboseFlags;
_openMode = openMode;
_createFlags = createFlag;
_runtimeFlags = runtimeFlags;
_isUserSpecifiedCacheDir = (J9_ARE_ALL_BITS_SET(_runtimeFlags, J9SHR_RUNTIMEFLAG_CACHEDIR_PRESENT));
/* get the cacheDirName for the first time */
if (!(_cacheDirName = (char*)j9mem_allocate_memory(J9SH_MAXPATH, J9MEM_CATEGORY_CLASSES))) {
Trc_SHR_OSC_commonStartup_nomem_cacheDirName();
OSC_ERR_TRACE(J9NLS_SHRC_OSCACHE_ALLOC_FAILED);
return -1;
}
IDATA rc = SH_OSCache::getCacheDir(vm, ctrlDirName, _cacheDirName, J9SH_MAXPATH, versionData->cacheType);
if (rc == -1) {
Trc_SHR_OSC_commonStartup_getCacheDir_fail();
/* NLS message has been printed out inside SH_OSCache::getCacheDir() if verbose flag is not 0 */
return -1;
}
rc = SH_OSCache::createCacheDir(PORTLIB, _cacheDirName, cacheDirPerm, ctrlDirName == NULL);
if (rc == -1) {
Trc_SHR_OSC_commonStartup_createCacheDir_fail();
/* remove trailing '/' */
_cacheDirName[strlen(_cacheDirName)-1] = '\0';
OSC_ERR_TRACE1(J9NLS_SHRC_OSCACHE_CREATECACHEDIR_FAILED_V2, _cacheDirName);
return -1;
}
/* A persistent cache's name has an extra character 'P' and a cache snapshot file name has an extra character "S",
* so we need an extra byte for them, while for cross guest shared caches we need three extra characters to
* accommodate the 'T??', where ?? stand for the platform encoding.
*/
if ((J9PORT_SHR_CACHE_TYPE_PERSISTENT == versionData->cacheType)
|| (J9PORT_SHR_CACHE_TYPE_SNAPSHOT == versionData->cacheType)
) {
versionStrLen = J9SH_VERSION_STRING_LEN + 1;
} else if (J9PORT_SHR_CACHE_TYPE_CROSSGUEST == versionData->cacheType) {
versionStrLen = J9SH_VERSION_STRING_LEN + 3;
} else {
versionStrLen = J9SH_VERSION_STRING_LEN;
}
if(J9_ARE_ANY_BITS_SET(_createFlags, J9SH_OSCACHE_CREATE | J9SH_OSCACHE_OPEXIST_DESTROY | J9SH_OSCACHE_OPEXIST_STATS | J9SH_OSCACHE_OPEXIST_DO_NOT_CREATE)) {
/* okay, one of the flags are set */
} else {
Trc_SHR_OSC_commonStartup_wrongCreateFlags();
OSC_ERR_TRACE(J9NLS_SHRC_OSCACHE_INVALIDFLAG);
return -1;
}
/* Allocate enough memory for _cacheName and _cacheNameWithVGen. J9SH_MEMORY_ID only used on sysv UNIX */
cacheNameLen = (strlen(cacheName) * 2) + versionStrLen + strlen("_GXXLXX") + 2 + strlen(J9SH_MEMORY_ID);
if (!(_cacheNameWithVGen = (char*)j9mem_allocate_memory(cacheNameLen, J9MEM_CATEGORY_CLASSES))) {
Trc_SHR_OSC_commonStartup_nomem_cacheName();
OSC_ERR_TRACE(J9NLS_SHRC_OSCACHE_ALLOC_FAILED);
return -1;
}
memset(_cacheNameWithVGen, 0, cacheNameLen);
getCacheVersionAndGen(PORTLIB, vm, _cacheNameWithVGen, cacheNameLen, cacheName, versionData, _activeGeneration, true, _layer);
/* The assert below is just a precaution.
* Check if cacheName with version and generation string is less than maximum length.
* The assert below will fail when the cache name becomes too big to fit in the array
* possibly due to a large version string or generational string
* or a hidden bug. strlen() function is intentionally not used since buffer might have overflowed
* and NULL character might have been overwritten in the case of a bug.
*
* Note that cacheNameLen can be less than CACHE_ROOT_MAXLEN, hence the 'min' macro is used.
* Simply check for presence of '\0 char before index CACHE_ROOT_MAXLEN for isolating the bug.
*/
Trc_SHR_Assert_True(_cacheNameWithVGen[OMR_MIN(cacheNameLen, CACHE_ROOT_MAXLEN) - 1] == '\0');
_cacheName = _cacheNameWithVGen + strlen(_cacheNameWithVGen) + 1;
memcpy(_cacheName, cacheName, strlen(cacheName) + 1);
setEnableVerbose(PORTLIB, vm, versionData, _cacheNameWithVGen);
if (getCachePathName(PORTLIB, _cacheDirName, fullPathName, J9SH_MAXPATH, _cacheNameWithVGen) == 0) {
cachePathNameLen = strlen(fullPathName);
if ((_cachePathName = (char*)j9mem_allocate_memory(cachePathNameLen + 1, J9MEM_CATEGORY_CLASSES))) {
strcpy(_cachePathName, fullPathName);
} else {
Trc_SHR_OSC_commonStartup_nomem_cachePathName();
OSC_ERR_TRACE(J9NLS_SHRC_OSCACHE_ALLOC_FAILED);
return -1;
}
}
_doCheckBuildID = ((openMode & J9OSCACHE_OPEN_MODE_CHECKBUILDID) != 0);
Trc_SHR_OSC_commonStartup_copied_cachePathName(_cachePathName, cachePathNameLen);
Trc_SHR_OSC_commonStartup_Exit();
return 0;
}
/* override if the cache is persistent */
void
SH_OSCache::dontNeedMetadata(J9VMThread* currentThread, const void* startAddress, size_t length) {
return;
}
/* Function that initializes class variables common to OSCache subclasses */
void
SH_OSCache::commonInit(J9PortLibrary* portLibrary, UDATA generation, I_8 layer)
{
_startupCompleted = false;
_portLibrary = portLibrary;
_activeGeneration = generation;
_layer = layer;
_cacheNameWithVGen = NULL;
_cacheName = NULL;
_cachePathName = NULL;
_cacheUniqueID = NULL;
_cacheDirName = NULL;
_verboseFlags = 0;
_createFlags = 0;
_config = NULL;
_openMode = 0;
_dataStart = NULL;
_dataLength = 0;
_headerStart = NULL;
_cacheSize = 0;
_errorCode = 0;
_runningReadOnly = false;
_doCheckBuildID = false;
_isUserSpecifiedCacheDir = false;
}
/* Function that cleans up resources common to OSCache subclasses */
void
SH_OSCache::commonCleanup()
{
PORT_ACCESS_FROM_PORT(_portLibrary);
Trc_SHR_OSC_commonCleanup_Entry();
if (_cacheNameWithVGen) {
j9mem_free_memory(_cacheNameWithVGen);
}
if (_cachePathName) {
j9mem_free_memory(_cachePathName);
}
if (_cacheDirName) {
j9mem_free_memory(_cacheDirName);
}
if (_cacheUniqueID) {
j9mem_free_memory(_cacheUniqueID);
}
/* If the cache is destroyed and then restarted, we still need portLibrary, versionData and generation */
commonInit(_portLibrary, _activeGeneration, _layer);
Trc_SHR_OSC_commonCleanup_Exit();
}
/**
* Static method to create a new OSCache instance
*
* @param [in] portLib The portlib
* @param [in] memForConstructor Pointer to the memory to build the OSCache instance into
* @param [in] cacheName Name of the cache
* @param [in] generation Generation of the cache
* @param [in] versionData Version data of the cache
* @param [in] layer The layer number of the cache
*
* @return A pointer to the new OSCache object (which will be the same as the memForConstructor parameter)
* It never returns NULL.
*/
SH_OSCache*
SH_OSCache::newInstance(J9PortLibrary* portlib, SH_OSCache* memForConstructor, const char* cacheName, UDATA generation, J9PortShcVersion* versionData, I_8 layer)
{
SH_OSCache* newOSC = (SH_OSCache*)memForConstructor;
PORT_ACCESS_FROM_PORT(portlib);
Trc_SHR_OSC_newInstance_Entry_V1(memForConstructor, cacheName, versionData->cacheType, layer);
switch(versionData->cacheType) {
case J9PORT_SHR_CACHE_TYPE_PERSISTENT :
Trc_SHR_OSC_newInstance_creatingMmap(newOSC);
new(newOSC) SH_OSCachemmap();
break;
case J9PORT_SHR_CACHE_TYPE_NONPERSISTENT :
Trc_SHR_OSC_newInstance_creatingSysv(newOSC);
new(newOSC) SH_OSCachesysv();
break;
case J9PORT_SHR_CACHE_TYPE_SNAPSHOT:
break;
#if defined(J9SHR_CACHELET_SUPPORT)
case J9PORT_SHR_CACHE_TYPE_VMEM :
/* TODO : tracepoint */
new(newOSC) SH_OSCachevmem();
break;
#endif
}
Trc_SHR_OSC_newInstance_initializingNewObject();
newOSC->initialize(PORTLIB, ((char*)memForConstructor + SH_OSCache::getRequiredConstrBytes()), generation, layer);
Trc_SHR_OSC_newInstance_Exit(newOSC);
return newOSC;
}
/**
* Static method to get the number of bytes required for an OSCache object
*
* @return The number of bytes required for an OSCache object
*/
UDATA
SH_OSCache::getRequiredConstrBytes(void)
{
UDATA reqBytes = 0;
if (sizeof(SH_OSCachesysv) > sizeof(SH_OSCachemmap)) {
reqBytes += sizeof(SH_OSCachesysv);
} else {
reqBytes += sizeof(SH_OSCachemmap);
}
return reqBytes;
}
/**
* Returns the current cache generation
*/
UDATA
SH_OSCache::getCurrentCacheGen(void)
{
return OSCACHE_CURRENT_CACHE_GEN;
}
void
SH_OSCache::setEnableVerbose(J9PortLibrary* portLib, J9JavaVM* vm, J9PortShcVersion* versionData, char* cacheNameWithVGen)
{
U_32 javaVersion = getJCLForShcModlevel(versionData->modlevel);
/* Disable verbose when only J9SHR_VERBOSEFLAG_ENABLE_VERBOSE_DEFAULT is set for older generation caches belonging to this VM release */
if ((J9SHR_VERBOSEFLAG_ENABLE_VERBOSE_DEFAULT ==_verboseFlags) && (_activeGeneration != OSCACHE_CURRENT_CACHE_GEN) &&
isCompatibleShcFilePrefix(portLib, javaVersion, getJVMFeature(vm), cacheNameWithVGen)) {
_verboseFlags = 0;
}
}
/**
* Return a list of all the caches/snapshots that can be found in the current cache directory
* It is the responsibility of the caller to free the pool returned by this function
* The function returns a semi-ordered pool with the compatible caches/snapshots first and incompatible ones last
*
* @param[in] vm The Java VM
* @param[in] ctrlDirName Cache directory
* @param[in] groupPerm Group permissions to open the cache directory
* @param[in] localVerboseFlags Flags indicating the level of verbose output in use
* @param[in] j2seVersion The j2se version that the VM is running
* @param[in] includeOldGenerations If true, include caches of older generations
* @param[in] ignoreCompatible If true, only gets cache/snapshot statistics of incompatible caches
* @param [in] reason Indicates the reason for getting cache/snapshot stats. Refer sharedconsts.h for valid values.
* @param [in] isCache If true, get cache stats. If false, get snapshot stats.
*
* @return a J9Pool that contains a semi-ordered list of caches/snapshots, NULL if no caches/snapshots are found
*/
J9Pool*
SH_OSCache::getAllCacheStatistics(J9JavaVM* vm, const char* ctrlDirName, UDATA groupPerm, UDATA localVerboseFlags, UDATA j2seVersion, bool includeOldGenerations, bool ignoreCompatible, UDATA reason, bool isCache)
{
J9PortLibrary* portlib = vm->portLibrary;
PORT_ACCESS_FROM_PORT(portlib);
UDATA snapshotFindHandle = (UDATA)-1;
UDATA shmemFindHandle = (UDATA)-1;
UDATA mmapFindHandle = (UDATA)-1;
/*
* It is essential that the length of these three arrays
* is EsMaxPath otherwise j9file_findX will overflow.
*/
char snapshotNameWithVGen[EsMaxPath];
char shmemNameWithVGen[EsMaxPath];
char mmapNameWithVGen[EsMaxPath];
char persistentCacheDir[J9SH_MAXPATH];
char nonpersistentCacheDir[J9SH_MAXPATH];
char* nameWithVGen = NULL;
IDATA cntr = 0;
J9Pool* incompatibleList = NULL;
SH_OSCache_Info tempInfo;
SH_OSCache_Info* newElement = NULL;
J9Pool* cacheList = NULL;
IDATA getShmDirVal = 0;
IDATA getMmapDirVal = 0;
bool doneSnapshot = true;
bool doneShmem = false;
bool donePerst = false;
bool outOfMem = false;
J9Pool* lowerLayerList = NULL;
J9Pool* rc = NULL;
Trc_SHR_OSC_getAllCacheStatistics_Entry();
if (false == isCache) {
/* return a list of snapshot files only */
doneSnapshot = false;
doneShmem = true;
donePerst = true;
/* use nonpersistentCacheDir for snapshot file */
getShmDirVal = getCacheDir(vm, ctrlDirName, nonpersistentCacheDir, J9SH_MAXPATH, J9PORT_SHR_CACHE_TYPE_SNAPSHOT);
if (-1 != getShmDirVal) {
snapshotFindHandle = SH_OSCacheFile::findfirst(PORTLIB,
nonpersistentCacheDir,
snapshotNameWithVGen, J9PORT_SHR_CACHE_TYPE_SNAPSHOT);
if ((UDATA)-1 == snapshotFindHandle) {
doneSnapshot = true;
} else {
nameWithVGen = snapshotNameWithVGen;
}
} else {
Trc_SHR_OSC_getAllCacheStatistics_Exit1();
rc = NULL;
goto cleanup;
}
} else {
if ((getShmDirVal = getCacheDir(vm,
ctrlDirName,
nonpersistentCacheDir,
J9SH_MAXPATH,
J9PORT_SHR_CACHE_TYPE_NONPERSISTENT)) != -1) {
shmemFindHandle = SH_OSCachesysv::findfirst(PORTLIB,
nonpersistentCacheDir,
shmemNameWithVGen);
if (shmemFindHandle == (UDATA)-1) {
doneShmem = true;
} else {
nameWithVGen = shmemNameWithVGen;
}
} else {
Trc_SHR_OSC_getAllCacheStatistics_Exit1();
rc = NULL;
goto cleanup;
}
/* If a cacheDir has been specified, need to also search the cacheDir for persistent caches */
if ((getMmapDirVal = getCacheDir(vm,
ctrlDirName,
persistentCacheDir,
J9SH_MAXPATH,
J9PORT_SHR_CACHE_TYPE_PERSISTENT)) != -1) {
if ((mmapFindHandle = SH_OSCacheFile::findfirst(PORTLIB,
persistentCacheDir,
mmapNameWithVGen,
J9PORT_SHR_CACHE_TYPE_PERSISTENT)) == (UDATA)-1) {
donePerst = true;
} else if (NULL == nameWithVGen) {
/* Set it to mmap-name only if it wasn't set to shmem name. */
nameWithVGen = mmapNameWithVGen;
}
} else {
Trc_SHR_OSC_getAllCacheStatistics_Exit1();
rc = NULL;
goto cleanup;
}
}
if (doneSnapshot && doneShmem && donePerst) {
Trc_SHR_OSC_getAllCacheStatistics_Exit1();
rc = NULL;
goto cleanup;
}
if (!ignoreCompatible) {
cacheList = pool_new(sizeof(SH_OSCache_Info), 0, 0, 0, J9_GET_CALLSITE(), J9MEM_CATEGORY_CLASSES, POOL_FOR_PORT(PORTLIB));
if (cacheList == NULL) {
Trc_SHR_OSC_getAllCacheStatistics_Exit2();
rc = NULL;
goto cleanup;
}
cacheList->flags |= POOL_ALWAYS_KEEP_SORTED;
}
/* Incompatible caches are added after the compatible caches so are initially created in a different pool */
incompatibleList = pool_new(sizeof(SH_OSCache_Info), 0, 0, 0, J9_GET_CALLSITE(), J9MEM_CATEGORY_CLASSES, POOL_FOR_PORT(PORTLIB));
if (incompatibleList == NULL) {
Trc_SHR_OSC_getAllCacheStatistics_Exit3();
rc = NULL;
goto cleanup;
}
incompatibleList->flags |= POOL_ALWAYS_KEEP_SORTED;
/* Walk all the cache files in the j9shmem dir and (optionally) the persistent cacheDir */
do {
J9Pool** lowerLayerListPtr = &lowerLayerList;
bool isToplayer = isTopLayerCache(vm, ctrlDirName, nameWithVGen);
bool getLowerLayerStats = false;
if (getCacheStatistics(vm, ctrlDirName, (const char*)nameWithVGen, groupPerm, localVerboseFlags, j2seVersion, &tempInfo, reason, getLowerLayerStats, isToplayer, lowerLayerListPtr, NULL) != -1) {
if (includeOldGenerations || !tempInfo.isCompatible || (getCurrentCacheGen() == tempInfo.generation)) {
if (tempInfo.isCompatible) {
if (!ignoreCompatible) {
if (isToplayer) {
/* nameWithVGen is a compatible top layer cache, lower layer stats are in lowerLayerList*/
newElement = (SH_OSCache_Info*) pool_newElement(cacheList);
if (NULL == newElement) {
Trc_SHR_OSC_getAllCacheStatistics_pool_newElement_failed(0);
outOfMem = true;
goto done;
}
memcpy(newElement, &tempInfo, sizeof(SH_OSCache_Info));
if (NULL != lowerLayerList) {
if (0 < pool_numElements(lowerLayerList)) {
pool_state poolState;
SH_OSCache_Info* anElement = (SH_OSCache_Info*)pool_startDo(lowerLayerList, &poolState);
do {
newElement = (SH_OSCache_Info*) pool_newElement(cacheList);
if (NULL == newElement) {
Trc_SHR_OSC_getAllCacheStatistics_pool_newElement_failed(1);
outOfMem = true;
goto done;
}
memcpy(newElement, anElement, sizeof(SH_OSCache_Info));
++cntr;
} while ((anElement = (SH_OSCache_Info*)pool_nextDo(&poolState)) != NULL);
}
}
} else {
if (SHR_STATS_REASON_ITERATE != reason) {
newElement = (SH_OSCache_Info*) pool_newElement(cacheList);
if (NULL == newElement) {
Trc_SHR_OSC_getAllCacheStatistics_pool_newElement_failed(2);
outOfMem = true;
goto done;
}
memcpy(newElement, &tempInfo, sizeof(SH_OSCache_Info));
}
/* nameWithVGen is a compatible lower layer cache and getLowerLayerStats is false, do nothing here. stats of non-top layers are included in the lowerLayerList of when calling getCacheStatistics() on the top layer */
}
} else {
/* ignoreCompatible is true, do nothing here */
}
} else {
newElement = (SH_OSCache_Info*) pool_newElement(incompatibleList);
if (NULL == newElement) {
Trc_SHR_OSC_getAllCacheStatistics_pool_newElement_failed(3);
outOfMem = true;
goto done;
}
memcpy(newElement, &tempInfo, sizeof(SH_OSCache_Info));
}
}
++cntr;
}
if (NULL != lowerLayerList) {
pool_kill(lowerLayerList);
lowerLayerList = NULL;
}
if (!doneSnapshot) {
if (-1 == SH_OSCacheFile::findnext(PORTLIB, snapshotFindHandle, snapshotNameWithVGen, J9PORT_SHR_CACHE_TYPE_SNAPSHOT)) {
doneSnapshot = true;
continue;
}
nameWithVGen = snapshotNameWithVGen;
} else if (!doneShmem) {
if (SH_OSCachesysv::findnext(PORTLIB, shmemFindHandle, shmemNameWithVGen) == -1) {
doneShmem = true;
if (!donePerst) {
nameWithVGen = mmapNameWithVGen;
continue;
}
} else {
nameWithVGen = shmemNameWithVGen;
}
} else if (!donePerst) {
if (SH_OSCacheFile::findnext(PORTLIB, mmapFindHandle, mmapNameWithVGen, J9PORT_SHR_CACHE_TYPE_PERSISTENT) == -1) {
donePerst = true;
} else {
nameWithVGen = mmapNameWithVGen;
}
}
} while(!doneSnapshot || !doneShmem || !donePerst);
/* Copy the incompatible cache data into the cacheList pool */
if (!ignoreCompatible) {
if (pool_numElements(incompatibleList)) {
pool_state poolState;
SH_OSCache_Info* anElement;
anElement = (SH_OSCache_Info*)pool_startDo(incompatibleList, &poolState);
do {
newElement = (SH_OSCache_Info*) pool_newElement(cacheList);
if (NULL == newElement) {
Trc_SHR_OSC_getAllCacheStatistics_pool_newElement_failed(4);
outOfMem = true;
goto done;
}
memcpy(newElement, anElement, sizeof(SH_OSCache_Info));
} while ((anElement = (SH_OSCache_Info*)pool_nextDo(&poolState)));
}
pool_kill(incompatibleList);
}
done:
if ((UDATA)-1 != snapshotFindHandle) {
SH_OSCacheFile::findclose(PORTLIB, snapshotFindHandle);
}
if (shmemFindHandle != (UDATA)-1) {
SH_OSCachesysv::findclose(PORTLIB, shmemFindHandle);
}
if (mmapFindHandle != (UDATA)-1) {
SH_OSCacheFile::findclose(PORTLIB, mmapFindHandle);
}
Trc_SHR_OSC_getAllCacheStatistics_Exit4();
if (outOfMem) {
if (NULL != lowerLayerList) {
pool_kill(lowerLayerList);
}
if (NULL != cacheList) {
pool_kill(cacheList);
}
if (NULL != incompatibleList) {
pool_kill(cacheList);
}
rc = NULL;
} else {
if (!ignoreCompatible) {
rc = cacheList;
} else {
rc = incompatibleList;
}
}
cleanup:
return rc;
}
/**
* Get statistics on a given named cache/snapshot
*
* @param[in] vm The Java VM
* @param[in] ctrlDirName Cache directory
* @param[in] cacheNameWithVGen The filename of the cache/snapshot to query
* @param[in] groupPerm Group permissions to open the cache directory
* @param[in] localVerboseFlags Flags indicating the level of verbose output in use
* @param[in] j2seVersion The j2se version that the JVM is running
* @param[out] result A pointer to a SH_OSCache_Info should be provided, which is filled in with the results
* @param[in] reason Indicates the reason for getting cache stats. Refer sharedconsts.h for valid values.
* @param[in] getLowerLayerStats Indicates whether the statistics we are trying to get from cacheNameWithVGen is a lower (non-top) layer shared cache.
* @param[in] isTopLayer Indicates whether the cache is top layer or not.
* @param[out] lowerLayerStatsList A list of SH_OSCache_Info for all lower layer caches.
* @param[in] oscache An SH_OSCache. It is not NULL only when we are getting a statistics on a compatible non-top layer cache.
*
* @return 0 if the operations has been successful, -1 if an error has occured
*/
IDATA
SH_OSCache::getCacheStatistics(J9JavaVM* vm, const char* ctrlDirName, const char* cacheNameWithVGen, UDATA groupPerm, UDATA localVerboseFlags, UDATA j2seVersion, SH_OSCache_Info* result, UDATA reason, bool getLowerLayerStats, bool isTopLayer, J9Pool** lowerLayerList, SH_OSCache* oscache)
{
J9PortLibrary* portlib = vm->portLibrary;
PORT_ACCESS_FROM_PORT(portlib);
bool displayErrorMsg, isCurrentGen;
IDATA rc = -1;
J9PortShcVersion currentVersionData;
U_64 fileVMVersion = 0;
U_64 curVMVersion = 0;
char cacheDirName[J9SH_MAXPATH];
Trc_SHR_OSC_getCacheStatistics_Entry();
if (NULL == result) {
Trc_SHR_OSC_getCacheStatistics_NullResult();
return -1;
}
if ((result->generation = getGenerationFromName(cacheNameWithVGen)) > OSCACHE_CURRENT_CACHE_GEN) {
Trc_SHR_OSC_getCacheStatistics_FutureGen();
return -1;
}
result->layer = getLayerFromName(cacheNameWithVGen);
Trc_SHR_Assert_True(
((0 <= result->layer) && (result->layer <= J9SH_LAYER_NUM_MAX_VALUE))
|| (J9SH_LAYER_NUM_UNSET == result->layer)
);
if (0 == getValuesFromShcFilePrefix(PORTLIB, cacheNameWithVGen, &(result->versionData))) {
Trc_SHR_OSC_getCacheStatistics_getValuesFromShcFilePrefix_Failed_Exit();
return -1;
}
if (getCacheDir(vm, ctrlDirName, cacheDirName, J9SH_MAXPATH, result->versionData.cacheType) == -1) {
Trc_SHR_OSC_getCacheDir_Failed_Exit();
return -1;
}
isCurrentGen = (result->generation == getCurrentCacheGen());
displayErrorMsg = (localVerboseFlags && isCurrentGen);
if (!statCache(portlib, cacheDirName, cacheNameWithVGen, displayErrorMsg)) {
Trc_SHR_OSC_getCacheStatistics_StatFailure();
return -1;
}
setCurrentCacheVersion(vm, j2seVersion, ¤tVersionData);
fileVMVersion = SH_OSCache::getCacheVersionToU64(result->versionData.esVersionMajor, result->versionData.esVersionMinor);
curVMVersion = SH_OSCache::getCacheVersionToU64(currentVersionData.esVersionMajor, currentVersionData.esVersionMinor);
if ( fileVMVersion <= curVMVersion ) {
/* The current JVM version can only see caches generated by:
* - Equal or lower JVM versions
* - Equal or lower JCL versions
*/
if (getShcModlevelForJCL(j2seVersion) < result->versionData.modlevel) {
Trc_SHR_OSC_getCacheStatistics_badModLevel_Exit(result->versionData.modlevel);
return -1;
}
} else if (fileVMVersion > curVMVersion) {
/*Ignore cache files from newer JVMs*/
Trc_SHR_OSC_getCacheStatistics_NewerJVMFile_Exit(cacheNameWithVGen);
return -1;
}
result->isCompatible = (isCurrentGen && isCompatibleShcFilePrefix(portlib, (U_32)JAVA_SPEC_VERSION_FROM_J2SE(j2seVersion), getJVMFeature(vm), cacheNameWithVGen));
/* isCorrupt is only valid if SHR_STATS_REASON_ITERATE is specified. */
result->isCorrupt = 0;
result->isJavaCorePopulated = 0;
memset(&(result->javacoreData), 0, sizeof(J9SharedClassJavacoreDataDescriptor));
result->javacoreData.feature = getJVMFeature(vm);
bool isCompatibleLowerLayer = (result->isCompatible) && (!isTopLayer);
if (SHR_STATS_REASON_ITERATE == reason) {
if (isCompatibleLowerLayer && !getLowerLayerStats) {
/* SH_OSCachemmap::getNonTopLayerCacheInfo() and SH_OSCachesysv::getNonTopLayerCacheInfo() are only called when iterating the caches.
* So check isCompatibleLowerLayer and getLowerLayerStats only when reason is SHR_STATS_REASON_ITERATE. */
return 0;
}
}
if (result->versionData.cacheType == J9PORT_SHR_CACHE_TYPE_PERSISTENT) {
if (isCompatibleLowerLayer && getLowerLayerStats) {
Trc_SHR_Assert_True(NULL != oscache);
rc = SH_OSCachemmap::getNonTopLayerCacheInfo(vm, ctrlDirName, groupPerm, cacheNameWithVGen, result, reason, (SH_OSCachemmap*)oscache);
} else {
Trc_SHR_OSC_getCacheStatistics_stattingMmap();
rc = SH_OSCachemmap::getCacheStats(vm, ctrlDirName, groupPerm, cacheNameWithVGen, result, reason, lowerLayerList);
}
} else if (result->versionData.cacheType == J9PORT_SHR_CACHE_TYPE_NONPERSISTENT) {
if (isCompatibleLowerLayer && getLowerLayerStats) {