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jvmtiHelpers.cpp
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/*******************************************************************************
* Copyright IBM Corp. and others 1991
*
* This program and the accompanying materials are made available under
* the terms of the Eclipse Public License 2.0 which accompanies this
* distribution and is available at https://www.eclipse.org/legal/epl-2.0/
* or the Apache License, Version 2.0 which accompanies this distribution and
* is available at https://www.apache.org/licenses/LICENSE-2.0.
*
* This Source Code may also be made available under the following
* Secondary Licenses when the conditions for such availability set
* forth in the Eclipse Public License, v. 2.0 are satisfied: GNU
* General Public License, version 2 with the GNU Classpath
* Exception [1] and GNU General Public License, version 2 with the
* OpenJDK Assembly Exception [2].
*
* [1] https://www.gnu.org/software/classpath/license.html
* [2] https://openjdk.org/legal/assembly-exception.html
*
* SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0-only WITH Classpath-exception-2.0 OR GPL-2.0-only WITH OpenJDK-assembly-exception-1.0
*******************************************************************************/
#include "jvmtiHelpers.h"
#include "jvmti_internal.h"
#include "j9cp.h"
#if JAVA_SPEC_VERSION >= 19
#include "HeapIteratorAPI.h"
#include "ContinuationHelpers.hpp"
#endif /* JAVA_SPEC_VERSION >= 19 */
extern "C" {
extern jvmtiNativeInterface jvmtiFunctionTable;
/* Jazz 99339: Map JVMTI event number to the reason code for zAAP switching on zOS.
* Note: refer to jvmtiEventCallbacks (/runtime/include/jvmti.h) for reserved JVMTI events.
*/
#if defined(J9VM_OPT_JAVA_OFFLOAD_SUPPORT)
static const UDATA reasonCodeFromJVMTIEvent[] = {
J9_JNI_OFFLOAD_SWITCH_JVMTI_VM_INIT, /* JVMTI_EVENT_VM_INIT */
J9_JNI_OFFLOAD_SWITCH_JVMTI_VM_DEATH, /* JVMTI_EVENT_VM_DEATH */
J9_JNI_OFFLOAD_SWITCH_JVMTI_THREAD_START, /* JVMTI_EVENT_THREAD_START */
J9_JNI_OFFLOAD_SWITCH_JVMTI_THREAD_END, /* JVMTI_EVENT_THREAD_END */
J9_JNI_OFFLOAD_SWITCH_JVMTI_CLASS_FILE_LOAD_HOOK, /* JVMTI_EVENT_CLASS_FILE_LOAD_HOOK */
J9_JNI_OFFLOAD_SWITCH_JVMTI_CLASS_LOAD, /* JVMTI_EVENT_CLASS_LOAD */
J9_JNI_OFFLOAD_SWITCH_JVMTI_CLASS_PREPARE, /* JVMTI_EVENT_CLASS_PREPARE */
J9_JNI_OFFLOAD_SWITCH_JVMTI_VM_START, /* JVMTI_EVENT_VM_START */
J9_JNI_OFFLOAD_SWITCH_JVMTI_EXCEPTION, /* JVMTI_EVENT_EXCEPTION */
J9_JNI_OFFLOAD_SWITCH_JVMTI_EXCEPTION_CATCH, /* JVMTI_EVENT_EXCEPTION_CATCH */
J9_JNI_OFFLOAD_SWITCH_JVMTI_SINGLE_STEP, /* JVMTI_EVENT_SINGLE_STEP */
J9_JNI_OFFLOAD_SWITCH_JVMTI_FRAME_POP, /* JVMTI_EVENT_FRAME_POP */
J9_JNI_OFFLOAD_SWITCH_JVMTI_BREAKPOINT, /* JVMTI_EVENT_BREAKPOINT */
J9_JNI_OFFLOAD_SWITCH_JVMTI_FIELD_ACCESS, /* JVMTI_EVENT_FIELD_ACCESS */
J9_JNI_OFFLOAD_SWITCH_JVMTI_FIELD_MODIFICATION, /* JVMTI_EVENT_FIELD_MODIFICATION */
J9_JNI_OFFLOAD_SWITCH_JVMTI_METHOD_ENTRY, /* JVMTI_EVENT_METHOD_ENTRY */
J9_JNI_OFFLOAD_SWITCH_JVMTI_METHOD_EXIT, /* JVMTI_EVENT_METHOD_EXIT */
J9_JNI_OFFLOAD_SWITCH_JVMTI_NATIVE_METHOD_BIND, /* JVMTI_EVENT_NATIVE_METHOD_BIND */
J9_JNI_OFFLOAD_SWITCH_JVMTI_COMPILED_METHOD_LOAD, /* JVMTI_EVENT_COMPILED_METHOD_LOAD */
J9_JNI_OFFLOAD_SWITCH_JVMTI_COMPILED_METHOD_UNLOAD, /* JVMTI_EVENT_COMPILED_METHOD_UNLOAD */
J9_JNI_OFFLOAD_SWITCH_JVMTI_DYNAMIC_CODE_GENERATED, /* JVMTI_EVENT_DYNAMIC_CODE_GENERATED */
J9_JNI_OFFLOAD_SWITCH_JVMTI_DATA_DUMP_REQUEST, /* JVMTI_EVENT_DATA_DUMP_REQUEST */
0, /* Reserved for JVMTI event */
J9_JNI_OFFLOAD_SWITCH_JVMTI_MONITOR_WAIT, /* JVMTI_EVENT_MONITOR_WAIT */
J9_JNI_OFFLOAD_SWITCH_JVMTI_MONITOR_WAITED, /* JVMTI_EVENT_MONITOR_WAITED */
J9_JNI_OFFLOAD_SWITCH_JVMTI_MONITOR_CONTENDED_ENTER, /* JVMTI_EVENT_MONITOR_CONTENDED_ENTER */
J9_JNI_OFFLOAD_SWITCH_JVMTI_MONITOR_CONTENDED_ENTERED, /* JVMTI_EVENT_MONITOR_CONTENDED_ENTERED */
0, /* Reserved for JVMTI event */
0, /* Reserved for JVMTI event */
0, /* Reserved for JVMTI event */
J9_JNI_OFFLOAD_SWITCH_JVMTI_RESOURCE_EXHAUSTED, /* JVMTI_EVENT_RESOURCE_EXHAUSTED */
J9_JNI_OFFLOAD_SWITCH_JVMTI_GC_START, /* JVMTI_EVENT_GARBAGE_COLLECTION_START */
J9_JNI_OFFLOAD_SWITCH_JVMTI_GC_FINISH, /* JVMTI_EVENT_GARBAGE_COLLECTION_FINISH */
J9_JNI_OFFLOAD_SWITCH_JVMTI_OBJECT_FREE, /* JVMTI_EVENT_OBJECT_FREE */
J9_JNI_OFFLOAD_SWITCH_JVMTI_VM_OBJECT_ALLOC, /* JVMTI_EVENT_VM_OBJECT_ALLOC */
0, /* Reserved for JVMTI event */
J9_JNI_OFFLOAD_SWITCH_JVMTI_SAMPLED_OBJECT_ALLOC, /* JVMTI_EVENT_SAMPLED_OBJECT_ALLOC */
J9_JNI_OFFLOAD_SWITCH_J9JVMTI_COMPILING_START, /* J9JVMTI_EVENT_COM_IBM_COMPILING_START */
J9_JNI_OFFLOAD_SWITCH_J9JVMTI_COMPILING_END, /* J9JVMTI_EVENT_COM_IBM_COMPILING_END */
J9_JNI_OFFLOAD_SWITCH_J9JVMTI_INSTRUMENTABLE_OBJECT_ALLOC, /* J9JVMTI_EVENT_COM_IBM_INSTRUMENTABLE_OBJECT_ALLOC */
J9_JNI_OFFLOAD_SWITCH_J9JVMTI_VM_DUMP_START, /* J9JVMTI_EVENT_COM_IBM_VM_DUMP_START */
J9_JNI_OFFLOAD_SWITCH_J9JVMTI_VM_DUMP_END, /* J9JVMTI_EVENT_COM_IBM_VM_DUMP_END */
J9_JNI_OFFLOAD_SWITCH_J9JVMTI_GC_CYCLE_START, /* J9JVMTI_EVENT_COM_IBM_GARBAGE_COLLECTION_CYCLE_START */
J9_JNI_OFFLOAD_SWITCH_J9JVMTI_GC_CYCLE_FINISH, /* J9JVMTI_EVENT_COM_IBM_GARBAGE_COLLECTION_CYCLE_FINISH */
J9_JNI_OFFLOAD_SWITCH_J9JVMTI_VIRTUAL_THREAD_MOUNT, /* J9JVMTI_EVENT_COM_SUN_HOTSPOT_EVENTS_VIRTUAL_THREAD_MOUNT */
J9_JNI_OFFLOAD_SWITCH_J9JVMTI_VIRTUAL_THREAD_UNMOUNT, /* J9JVMTI_EVENT_COM_SUN_HOTSPOT_EVENTS_VIRTUAL_THREAD_UNMOUNT */
};
#endif /* J9VM_OPT_JAVA_OFFLOAD_SUPPORT */
static void clearGlobalBreakpoint (J9VMThread * currentThread, J9JVMTIGlobalBreakpoint * globalBreakpoint);
static jvmtiError setGlobalBreakpoint (J9VMThread * currentThread, J9Method * ramMethod, IDATA location, J9JVMTIGlobalBreakpoint ** globalBreakpointPtr);
static jvmtiError createSingleBreakpoint (J9VMThread * currentThread, J9Method * ramMethod, IDATA location, J9JVMTIGlobalBreakpoint ** globalBreakpointPtr);
static UDATA hashObjectTag (void *entry, void *userData);
static void deleteBreakpointedMethodReference (J9VMThread * currentThread, J9JVMTIBreakpointedMethod * breakpointedMethod);
static UDATA fixBytecodesFrameIterator (J9VMThread * currentThread, J9StackWalkState * walkState);
static void fixBytecodesInAllStacks (J9VMThread *currentThread, J9Method * method, UDATA delta);
static void clearSingleBreakpoint (J9VMThread * currentThread, J9JVMTIGlobalBreakpoint * globalBreakpoint);
static J9JVMTIGlobalBreakpoint * findGlobalBreakpoint (J9JVMTIData * jvmtiData, J9Method * ramMethod, IDATA location);
static J9JVMTIBreakpointedMethod * createBreakpointedMethod (J9VMThread * currentThread, J9Method * ramMethod);
static UDATA hashEqualObjectTag (void *lhsEntry, void *rhsEntry, void *userData);
static UDATA findDecompileInfoFrameIterator(J9VMThread *currentThread, J9StackWalkState *walkState);
static UDATA watchedClassHash (void *entry, void *userData);
static UDATA watchedClassEqual (void *lhsEntry, void *rhsEntry, void *userData);
static jint getThreadStateHelper(J9VMThread *currentThread, j9object_t threadObject, J9VMThread *vmThread);
#if JAVA_SPEC_VERSION >= 19
static jvmtiIterationControl fixBytecodesCallBack(J9VMThread *currentThread, J9MM_IterateObjectDescriptor *object, void *userData);
#endif /* JAVA_SPEC_VERSION >= 19 */
jvmtiError
getVMThread(J9VMThread *currentThread, jthread thread, J9VMThread **vmThreadPtr, jvmtiError vThreadError, UDATA flags)
{
J9JavaVM *vm = currentThread->javaVM;
j9object_t threadObject = NULL;
J9VMThread *targetThread = NULL;
BOOLEAN isThreadAlive = FALSE;
#if JAVA_SPEC_VERSION >= 19
BOOLEAN isVirtualThread = FALSE;
#endif /* JAVA_SPEC_VERSION >= 19 */
if (NULL == thread) {
if (OMR_ARE_ANY_BITS_SET(flags, J9JVMTI_GETVMTHREAD_ERROR_ON_NULL_JTHREAD)) {
return JVMTI_ERROR_INVALID_THREAD;
}
#if JAVA_SPEC_VERSION >= 19
if (OMR_ARE_ANY_BITS_SET(flags, J9JVMTI_GETVMTHREAD_ERROR_ON_VIRTUALTHREAD)
&& IS_JAVA_LANG_VIRTUALTHREAD(currentThread, currentThread->threadObject)
) {
return vThreadError;
}
#endif /* JAVA_SPEC_VERSION >= 19 */
*vmThreadPtr = currentThread;
return JVMTI_ERROR_NONE;
} else {
threadObject = J9_JNI_UNWRAP_REFERENCE(thread);
if (!IS_JAVA_LANG_THREAD(currentThread, threadObject)) {
return JVMTI_ERROR_INVALID_THREAD;
}
#if JAVA_SPEC_VERSION >= 19
if (OMR_ARE_ANY_BITS_SET(flags, J9JVMTI_GETVMTHREAD_ERROR_ON_VIRTUALTHREAD)
&& IS_JAVA_LANG_VIRTUALTHREAD(currentThread, threadObject)
) {
return vThreadError;
}
#endif /* JAVA_SPEC_VERSION >= 19 */
if (currentThread->threadObject == threadObject) {
*vmThreadPtr = currentThread;
return JVMTI_ERROR_NONE;
}
}
#if JAVA_SPEC_VERSION >= 19
isVirtualThread = IS_JAVA_LANG_VIRTUALTHREAD(currentThread, threadObject);
if (isVirtualThread) {
vm->internalVMFunctions->acquireVThreadInspector(currentThread, thread, TRUE);
/* Re-fetch threadObject since acquireVThreadInspector can release and reacquire VM access. */
threadObject = J9_JNI_UNWRAP_REFERENCE(thread);
}
#endif /* JAVA_SPEC_VERSION >= 19 */
/* Make sure the vmThread stays alive while it is being used. */
omrthread_monitor_enter(vm->vmThreadListMutex);
#if JAVA_SPEC_VERSION >= 19
if (isVirtualThread) {
jint vthreadState = 0;
j9object_t carrierThread = NULL;
vthreadState = J9VMJAVALANGVIRTUALTHREAD_STATE(currentThread, threadObject);
carrierThread = (j9object_t)J9VMJAVALANGVIRTUALTHREAD_CARRIERTHREAD(currentThread, threadObject);
if (NULL != carrierThread) {
targetThread = J9VMJAVALANGTHREAD_THREADREF(currentThread, carrierThread);
}
isThreadAlive = (JVMTI_VTHREAD_STATE_NEW != vthreadState) && (JVMTI_VTHREAD_STATE_TERMINATED != vthreadState);
} else
#endif /* JAVA_SPEC_VERSION >= 19 */
{
targetThread = J9VMJAVALANGTHREAD_THREADREF(currentThread, threadObject);
isThreadAlive = J9VMJAVALANGTHREAD_STARTED(currentThread, threadObject) && (NULL != targetThread);
}
if (!isThreadAlive) {
if (OMR_ARE_ANY_BITS_SET(flags, J9JVMTI_GETVMTHREAD_ERROR_ON_DEAD_THREAD)) {
omrthread_monitor_exit(vm->vmThreadListMutex);
#if JAVA_SPEC_VERSION >= 19
if (isVirtualThread) {
vm->internalVMFunctions->releaseVThreadInspector(currentThread, thread);
}
#endif /* JAVA_SPEC_VERSION >= 19 */
return JVMTI_ERROR_THREAD_NOT_ALIVE;
}
}
*vmThreadPtr = targetThread;
if (NULL != targetThread) {
targetThread->inspectorCount += 1;
}
omrthread_monitor_exit(vm->vmThreadListMutex);
#if JAVA_SPEC_VERSION >= 19
if (isThreadAlive && !isVirtualThread) {
/* targetThread should not be NULL for alive non-virtual threads. */
Assert_JVMTI_true(NULL != targetThread);
}
#endif /* JAVA_SPEC_VERSION >= 19 */
return JVMTI_ERROR_NONE;
}
void
releaseVMThread(J9VMThread *currentThread, J9VMThread *targetThread, jthread thread)
{
#if JAVA_SPEC_VERSION >= 19
if (NULL != thread) {
j9object_t threadObject = J9_JNI_UNWRAP_REFERENCE(thread);
if ((currentThread->threadObject != threadObject) && IS_JAVA_LANG_VIRTUALTHREAD(currentThread, threadObject)) {
currentThread->javaVM->internalVMFunctions->releaseVThreadInspector(currentThread, thread);
}
}
#endif /* JAVA_SPEC_VERSION >= 19 */
if ((NULL != targetThread) && (currentThread != targetThread)) {
J9JavaVM *vm = targetThread->javaVM;
/* Release the J9VMThread (allow it to die) now that we are no longer inspecting it. */
omrthread_monitor_enter(vm->vmThreadListMutex);
if (0 == --(targetThread->inspectorCount)) {
omrthread_monitor_notify_all(vm->vmThreadListMutex);
}
omrthread_monitor_exit(vm->vmThreadListMutex);
}
}
/* Assumes that exclusive VM access and jvmtiData->mutex is held, or that execution is single-threaded (at shutdown) */
void
disposeEnvironment(J9JVMTIEnv * j9env, UDATA freeData)
{
J9JavaVM * vm = j9env->vm;
/* Mark this env as disposed - this prevents any further events being reported */
if (J9_ARE_NO_BITS_SET(j9env->flags, J9JVMTIENV_FLAG_DISPOSED)) {
J9HookInterface ** vmHook = j9env->vmHook.hookInterface;
J9HookInterface ** gcHook = j9env->gcHook.hookInterface;
J9HookInterface ** gcOmrHook = j9env->gcOmrHook.hookInterface;
#if defined (J9VM_INTERP_NATIVE_SUPPORT)
J9HookInterface** jitHook = j9env->jitHook.hookInterface;
#endif
j9env->flags |= J9JVMTIENV_FLAG_DISPOSED;
#if JAVA_SPEC_VERSION >= 11
if (j9env->capabilities.can_generate_sampled_object_alloc_events) {
J9JVMTI_DATA_FROM_VM(vm)->flags &= ~J9JVMTI_FLAG_SAMPLED_OBJECT_ALLOC_ENABLED;
/* Set sampling interval to UDATA_MAX to inform GC that sampling is not required */
vm->memoryManagerFunctions->j9gc_set_allocation_sampling_interval(vm, UDATA_MAX);
}
#endif /* JAVA_SPEC_VERSION >= 11 */
/* Remove all breakpoints */
if (j9env->breakpoints != NULL) {
J9VMThread * currentThread = vm->internalVMFunctions->currentVMThread(vm);
pool_state poolState;
J9JVMTIAgentBreakpoint * agentBreakpoint = NULL;
agentBreakpoint = (J9JVMTIAgentBreakpoint*)pool_startDo(j9env->breakpoints, &poolState);
while (agentBreakpoint != NULL) {
deleteAgentBreakpoint(currentThread, j9env, agentBreakpoint);
agentBreakpoint = (J9JVMTIAgentBreakpoint*)pool_nextDo(&poolState);
}
}
/* Unhook all the events - note this does not guarantee that no further events will be received - some may be in progress already */
unhookAllEvents(j9env);
/* Discard the agent IDs */
(*vmHook)->J9HookDeallocateAgentID(vmHook, j9env->vmHook.agentID);
(*gcHook)->J9HookDeallocateAgentID(gcHook, j9env->gcHook.agentID);
(*gcOmrHook)->J9HookDeallocateAgentID(gcOmrHook, j9env->gcOmrHook.agentID);
#if defined (J9VM_INTERP_NATIVE_SUPPORT)
if (jitHook != NULL) {
(*jitHook)->J9HookDeallocateAgentID(vmHook, j9env->jitHook.agentID);
}
#endif
}
/* Free the data if requested */
if (freeData) {
PORT_ACCESS_FROM_JAVAVM(vm);
j9mem_free_memory(j9env->prefixes);
if (NULL != j9env->mutex) {
omrthread_monitor_destroy(j9env->mutex);
j9env->mutex = NULL;
}
if (NULL != j9env->threadDataPoolMutex) {
omrthread_monitor_destroy(j9env->threadDataPoolMutex);
j9env->threadDataPoolMutex = NULL;
}
if (NULL != j9env->threadDataPool) {
pool_kill(j9env->threadDataPool);
j9env->threadDataPool = NULL;
}
if (NULL != j9env->objectTagTable) {
hashTableFree(j9env->objectTagTable);
j9env->objectTagTable = NULL;
}
if (NULL != j9env->watchedClasses) {
J9HashTableState walkState;
J9JVMTIWatchedClass *watchedClass = (J9JVMTIWatchedClass*)hashTableStartDo(j9env->watchedClasses, &walkState);
while (NULL != watchedClass) {
if (J9JVMTI_CLASS_REQUIRES_ALLOCATED_J9JVMTI_WATCHED_FIELD_ACCESS_BITS(watchedClass->clazz)) {
j9mem_free_memory(watchedClass->watchBits);
}
watchedClass = (J9JVMTIWatchedClass*)hashTableNextDo(&walkState);
}
hashTableFree(j9env->watchedClasses);
j9env->watchedClasses = NULL;
}
if (NULL != j9env->breakpoints) {
pool_kill(j9env->breakpoints);
j9env->breakpoints = NULL;
}
if (0 != j9env->tlsKey) {
jvmtiTLSFree(vm, j9env->tlsKey);
j9env->tlsKey = 0;
}
}
}
jint
allocateEnvironment(J9InvocationJavaVM * invocationJavaVM, jint version, void ** penv)
{
J9JavaVM * vm = NULL;
J9JVMTIData * jvmtiData = NULL;
J9JVMTIEnv * j9env;
jint rc = JNI_EDETACHED;
J9VMThread * currentThread;
Assert_JVMTI_true(NULL != invocationJavaVM);
vm = invocationJavaVM->j9vm;
jvmtiData = J9JVMTI_DATA_FROM_VM(vm);
if (getCurrentVMThread(vm, ¤tThread) == JVMTI_ERROR_NONE) {
vm->internalVMFunctions->internalEnterVMFromJNI(currentThread);
vm->internalVMFunctions->acquireExclusiveVMAccess(currentThread);
omrthread_monitor_enter(jvmtiData->mutex);
rc = JNI_ENOMEM;
j9env = (J9JVMTIEnv*)pool_newElement(jvmtiData->environments);
if (j9env != NULL) {
J9HookInterface ** vmHook = vm->internalVMFunctions->getVMHookInterface(vm);
J9HookInterface ** gcHook = vm->memoryManagerFunctions->j9gc_get_hook_interface(vm);
J9HookInterface ** gcOmrHook = vm->memoryManagerFunctions->j9gc_get_omr_hook_interface(vm->omrVM);
#if defined (J9VM_INTERP_NATIVE_SUPPORT)
J9HookInterface** jitHook = vm->internalVMFunctions->getJITHookInterface(vm);
#endif
memset(j9env, 0, sizeof(J9JVMTIEnv));
j9env->functions = &jvmtiFunctionTable;
j9env->vm = vm;
#if defined(J9VM_OPT_JAVA_OFFLOAD_SUPPORT)
/* Jazz 99339: store J9NativeLibrary in J9JVMTIEnv so as to check the zAAP switching flag in the JVMTI event callbacks */
j9env->library = invocationJavaVM->reserved2_library;
#endif /* J9VM_OPT_JAVA_OFFLOAD_SUPPORT */
j9env->vmHook.hookInterface = vmHook;
j9env->gcHook.hookInterface = gcHook;
j9env->gcOmrHook.hookInterface = gcOmrHook;
#if defined (J9VM_INTERP_NATIVE_SUPPORT)
j9env->jitHook.hookInterface = jitHook;
#endif
if ((j9env->vmHook.agentID = (*vmHook)->J9HookAllocateAgentID(vmHook)) == 0) {
goto fail;
}
if ((j9env->gcHook.agentID = (*gcHook)->J9HookAllocateAgentID(gcHook)) == 0) {
goto fail;
}
if ((j9env->gcOmrHook.agentID = (*gcOmrHook)->J9HookAllocateAgentID(gcOmrHook)) == 0) {
goto fail;
}
#if defined (J9VM_INTERP_NATIVE_SUPPORT)
if (jitHook != NULL) {
if ((j9env->jitHook.agentID = (*jitHook)->J9HookAllocateAgentID(jitHook)) == 0) {
goto fail;
}
}
#endif
if (omrthread_monitor_init(&(j9env->mutex), 0) != 0) {
goto fail;
}
if (omrthread_monitor_init(&(j9env->threadDataPoolMutex), 0) != 0) {
goto fail;
}
j9env->threadDataPool = pool_new(sizeof(J9JVMTIThreadData), 0, 0, 0, J9_GET_CALLSITE(), J9MEM_CATEGORY_JVMTI, POOL_FOR_PORT(vm->portLibrary));
if (j9env->threadDataPool == NULL) {
goto fail;
}
j9env->objectTagTable = hashTableNew(OMRPORT_FROM_J9PORT(vm->portLibrary), J9_GET_CALLSITE(), 0, sizeof(J9JVMTIObjectTag), sizeof(jlong), 0, J9MEM_CATEGORY_JVMTI, hashObjectTag, hashEqualObjectTag, NULL, NULL);
if (j9env->objectTagTable == NULL) {
goto fail;
}
j9env->watchedClasses = hashTableNew(OMRPORT_FROM_J9PORT(vm->portLibrary), J9_GET_CALLSITE(), 0, sizeof(J9JVMTIWatchedClass), sizeof(UDATA), 0, J9MEM_CATEGORY_JVMTI, watchedClassHash, watchedClassEqual, NULL, NULL);
if (j9env->watchedClasses == NULL) {
goto fail;
}
j9env->breakpoints = pool_new(sizeof(J9JVMTIAgentBreakpoint), 0, 0, POOL_ALWAYS_KEEP_SORTED, J9_GET_CALLSITE(), J9MEM_CATEGORY_JVMTI, POOL_FOR_PORT(vm->portLibrary));
if (j9env->breakpoints == NULL) {
goto fail;
}
j9env->tlsKey = 0;
/* Hook the thread and virtual thread destroy events to clean up any allocated TLS structs. */
if (hookRequiredEvents(j9env) != 0) {
goto fail;
}
if (jvmtiData->environmentsHead == NULL) {
issueWriteBarrier();
jvmtiData->environmentsHead = jvmtiData->environmentsTail = j9env;
} else {
j9env->linkPrevious = jvmtiData->environmentsTail;
issueWriteBarrier();
jvmtiData->environmentsTail->linkNext = j9env;
jvmtiData->environmentsTail = j9env;
}
rc = JNI_OK;
*penv = j9env;
fail:
if (rc != JNI_OK) {
disposeEnvironment(j9env, TRUE);
}
}
omrthread_monitor_exit(jvmtiData->mutex);
vm->internalVMFunctions->releaseExclusiveVMAccess(currentThread);
vm->internalVMFunctions->internalExitVMToJNI(currentThread);
}
return rc;
}
UDATA
prepareForEvent(J9JVMTIEnv * j9env, J9VMThread * currentThread, J9VMThread * eventThread, UDATA eventNumber, jthread * threadRefPtr, UDATA * hadVMAccessPtr, UDATA wantVMAccess, UDATA jniRefSlots, UDATA * javaOffloadOldState)
{
J9JVMTIThreadData *threadData = NULL;
#if JAVA_SPEC_VERSION >= 19
j9object_t threadObj = currentThread->threadObject;
/* threadObj can be null early in J9VMThread initialization. */
if (NULL != threadObj) {
void *tlsArray = J9OBJECT_ADDRESS_LOAD(currentThread, threadObj, currentThread->javaVM->tlsOffset);
if (NULL != tlsArray) {
threadData = jvmtiTLSGet(currentThread, threadObj, j9env->tlsKey);
}
}
#else
threadData = jvmtiTLSGet(currentThread, currentThread->threadObject, j9env->tlsKey);
#endif /* JAVA_SPEC_VERSION >= 19 */
/* If this environment has been disposed, do not report any events */
if (j9env->flags & J9JVMTIENV_FLAG_DISPOSED) {
return FALSE;
}
/* Allow the VM_DEATH and THREAD_END event to be sent on a dead thread, but no others */
if (currentThread->publicFlags & J9_PUBLIC_FLAGS_STOPPED) {
if ((eventNumber != JVMTI_EVENT_VM_DEATH)
&& (eventNumber != JVMTI_EVENT_THREAD_END)
) {
return FALSE;
}
}
/* Do not issue events on threads that do not have a threadObject. We ignore this check
* when in Primordial phase since the threadObject is not initialized until sometime after
* j.l.Thread is loaded. This is done to correctly fire the Class File Load events on classes
* loaded prior to j.l.Thread. See CMVC 127730 */
if ((NULL == eventThread->threadObject) && (J9JVMTI_PHASE(j9env) != JVMTI_PHASE_PRIMORDIAL)) {
return FALSE;
}
/* See if the event is enabled either globally or for the current thread */
if (EVENT_IS_ENABLED(eventNumber, &(j9env->globalEventEnable))
|| ((NULL != threadData) && EVENT_IS_ENABLED(eventNumber, &(threadData->threadEventEnable)))
) {
j9object_t * refs;
++jniRefSlots; /* for saving the current exception */
if (threadRefPtr != NULL) {
++jniRefSlots;
}
*hadVMAccessPtr = pushEventFrame(currentThread, TRUE, jniRefSlots);
/* Preserve and clear any pending exception in the current thread */
refs = (j9object_t*) (((J9SFJNINativeMethodFrame *) currentThread->sp) + 1);
refs[0] = currentThread->currentException;
currentThread->currentException = NULL;
if (threadRefPtr != NULL) {
jthread threadRef = (jthread) (refs + 1);
*((j9object_t*) threadRef) = eventThread->threadObject;
*threadRefPtr = threadRef;
}
if (!wantVMAccess) {
currentThread->javaVM->internalVMFunctions->internalExitVMToJNI(currentThread);
}
#if defined(J9VM_OPT_JAVA_OFFLOAD_SUPPORT)
/* Jazz 99339: Switch away from the zAAP processor if running there */
if (J9_ARE_ALL_BITS_SET(currentThread->javaVM->extendedRuntimeFlags, J9_EXTENDED_RUNTIME_RESTRICT_IFA)) {
javaOffloadSwitchOff(j9env, currentThread, eventNumber, javaOffloadOldState);
}
#endif /* J9VM_OPT_JAVA_OFFLOAD_SUPPORT */
return TRUE;
}
return FALSE;
}
#if defined(J9VM_OPT_JAVA_OFFLOAD_SUPPORT)
void
javaOffloadSwitchOff(J9JVMTIEnv * j9env, J9VMThread * currentThread, UDATA eventNumber, UDATA * javaOffloadOldState)
{
J9JavaVM * vm = NULL;
BOOLEAN zAAPSwitchingFlag = FALSE;
J9NativeLibrary * nativeLibrary = j9env->library;
Assert_JVMTI_true(NULL != currentThread);
vm = currentThread->javaVM;
/* There are two cases for zAAP switching:
* 1) The agent library (most likely created by customer) calls GetEnv() at any time when required
* but doesn't need to call GetEnv() in Agent_OnLoad. Thus, it may be possible for j9env->library
* to be NULL if JVMTI is used directly by the VM.
* 2) The flag in J9NativeLibrary->doSwitching requires it to do zAAP switching.
*/
if (NULL == nativeLibrary) {
zAAPSwitchingFlag = TRUE;
} else if (J9_ARE_ALL_BITS_SET(nativeLibrary->doSwitching, J9_NATIVE_LIBRARY_SWITCH_REQUIRED)) {
zAAPSwitchingFlag = TRUE;
}
if ((NULL != vm->javaOffloadSwitchOffWithReasonFunc) && (TRUE == zAAPSwitchingFlag)) {
/* Save the old state */
*javaOffloadOldState = currentThread->javaOffloadState;
/* Zero the state and switch java offload mode OFF */
currentThread->javaOffloadState = 0;
vm->javaOffloadSwitchOffWithReasonFunc(currentThread, reasonCodeFromJVMTIEvent[eventNumber - J9JVMTI_LOWEST_EVENT]);
}
}
#endif /* J9VM_OPT_JAVA_OFFLOAD_SUPPORT */
jvmtiError
getCurrentVMThread(J9JavaVM * vm, J9VMThread ** currentThread)
{
*currentThread = vm->internalVMFunctions->currentVMThread(vm);
if (*currentThread == NULL) {
return JVMTI_ERROR_UNATTACHED_THREAD;
}
return JVMTI_ERROR_NONE;
}
jvmtiError
cStringFromUTF(jvmtiEnv * env, J9UTF8 * utf, char ** cString)
{
return cStringFromUTFChars(env, J9UTF8_DATA(utf), J9UTF8_LENGTH(utf), cString);
}
jvmtiError
cStringFromUTFChars(jvmtiEnv * env, U_8 * data, UDATA length, char ** cString)
{
jvmtiError rc = JVMTI_ERROR_NONE;
PORT_ACCESS_FROM_JVMTI(env);
*cString = (char*)j9mem_allocate_memory(length + 1, J9MEM_CATEGORY_JVMTI_ALLOCATE);
if (*cString == NULL) {
rc = JVMTI_ERROR_OUT_OF_MEMORY;
} else {
memcpy(*cString, data, length);
(*cString)[length] = '\0';
}
return rc;
}
U_16
nextUTFChar(U_8 ** pUtfData)
{
U_8 * utfData = *pUtfData;
U_16 utfChar;
utfChar = *(utfData++);
if (utfChar & 0x80) {
if (utfChar & 0x20) {
utfChar = (utfChar & 0x0F) << 12;
utfChar |= ((((U_16) *(utfData++)) & 0x3F) << 6);
utfChar |= (((U_16) *(utfData++)) & 0x3F);
} else {
utfChar = (utfChar & 0x1F) << 6;
utfChar |= (((U_16) *(utfData++)) & 0x3F);
}
}
*pUtfData = utfData;
return utfChar;
}
void
skipSignature(U_8 ** pUtfData)
{
U_16 utfChar;
/* Skip array prefixes */
do {
utfChar = nextUTFChar(pUtfData);
} while (utfChar == '[');
/* Skip to the end of Object type signatures */
if (IS_REF_OR_VAL_SIGNATURE(utfChar)) {
do {
utfChar = nextUTFChar(pUtfData);
} while (utfChar != ';');
}
}
void
finishedEvent(J9VMThread * currentThread, UDATA eventNumber, UDATA hadVMAccess, UDATA javaOffloadOldState)
{
J9SFJNINativeMethodFrame * frame = ((J9SFJNINativeMethodFrame *) (((U_8 *) currentThread->sp) + (UDATA) currentThread->literals));
/* Acquire VM access if the current thread does not already have it */
#if defined(J9VM_INTERP_ATOMIC_FREE_JNI)
if (currentThread->inNative) {
currentThread->javaVM->internalVMFunctions->internalEnterVMFromJNI(currentThread);
}
#else /* J9VM_INTERP_ATOMIC_FREE_JNI */
if (!(currentThread->publicFlags & J9_PUBLIC_FLAGS_VM_ACCESS)) {
currentThread->javaVM->internalVMFunctions->internalAcquireVMAccess(currentThread);
}
#endif /* J9VM_INTERP_ATOMIC_FREE_JNI */
/* Restore the pending exception in the current thread */
currentThread->currentException = getObjectFromRef((j9object_t*) (frame + 1));
/* Pop the frame */
popEventFrame(currentThread, hadVMAccess);
#if defined(J9VM_OPT_JAVA_OFFLOAD_SUPPORT)
/* Jazz 99339: Switch onto the zAAP processor if not running there after native finishes running on GP */
if (J9_ARE_ALL_BITS_SET(currentThread->javaVM->extendedRuntimeFlags, J9_EXTENDED_RUNTIME_RESTRICT_IFA)) {
javaOffloadSwitchOn(currentThread, eventNumber, javaOffloadOldState);
}
#endif /* J9VM_OPT_JAVA_OFFLOAD_SUPPORT */
}
#if defined(J9VM_OPT_JAVA_OFFLOAD_SUPPORT)
void
javaOffloadSwitchOn(J9VMThread * currentThread, UDATA eventNumber, UDATA javaOffloadOldState)
{
J9JavaVM *vm = NULL;
Assert_JVMTI_true(NULL != currentThread);
vm = currentThread->javaVM;
/* Check if java offload mode is enabled */
if (NULL != vm->javaOffloadSwitchOnWithReasonFunc) {
if (0 == currentThread->javaOffloadState) {
/* Call the offload switch ON */
vm->javaOffloadSwitchOnWithReasonFunc(currentThread, reasonCodeFromJVMTIEvent[eventNumber - J9JVMTI_LOWEST_EVENT]);
/* Restore the old state */
currentThread->javaOffloadState = javaOffloadOldState;
}
}
}
#endif /* J9VM_OPT_JAVA_OFFLOAD_SUPPORT */
static jint
getThreadStateHelper(J9VMThread *currentThread, j9object_t threadObject, J9VMThread *vmThread)
{
jint state = 0;
UDATA vmstate = getVMThreadObjectStatesAll(vmThread, NULL, NULL, NULL);
/* Assumes that the current thread has VM access, and the thread is locked (will not die) */
if (vmThread == NULL || (vmstate & J9VMTHREAD_STATE_UNKNOWN)) {
if (J9VMJAVALANGTHREAD_STARTED(currentThread, threadObject)) {
state |= JVMTI_THREAD_STATE_TERMINATED;
} else {
/* new thread */
}
} else if (vmstate & J9VMTHREAD_STATE_DEAD) {
state |= JVMTI_THREAD_STATE_TERMINATED;
} else {
state |= JVMTI_THREAD_STATE_ALIVE;
if (vmstate & J9VMTHREAD_STATE_SUSPENDED) {
state |= JVMTI_THREAD_STATE_SUSPENDED;
}
#if JAVA_SPEC_VERSION >= 19
/* Based on the isSuspendedInternal field, set the JVMTI
* thread state to suspended for the corresponding thread.
*/
if (0 != J9OBJECT_U32_LOAD(currentThread, threadObject, currentThread->javaVM->isSuspendedInternalOffset)) {
state |= JVMTI_THREAD_STATE_SUSPENDED;
} else {
state &= ~JVMTI_THREAD_STATE_SUSPENDED;
}
#endif /* JAVA_SPEC_VERSION >= 19 */
if (vmstate & J9VMTHREAD_STATE_INTERRUPTED) {
state |= JVMTI_THREAD_STATE_INTERRUPTED;
}
#if defined(J9VM_INTERP_ATOMIC_FREE_JNI)
if (vmThread->inNative) {
state |= JVMTI_THREAD_STATE_IN_NATIVE;
}
#else /* J9VM_INTERP_ATOMIC_FREE_JNI */
if ( (vmThread->omrVMThread->vmState & J9VMSTATE_MAJOR) == J9VMSTATE_JNI ) {
if (!(vmThread->publicFlags & J9_PUBLIC_FLAGS_VM_ACCESS)) {
state |= JVMTI_THREAD_STATE_IN_NATIVE;
}
}
#endif /* J9VM_INTERP_ATOMIC_FREE_JNI */
if (vmstate & J9VMTHREAD_STATE_BLOCKED) {
state |= JVMTI_THREAD_STATE_BLOCKED_ON_MONITOR_ENTER;
/* Object.wait() */
} else if (vmstate & J9VMTHREAD_STATE_WAITING) {
state |= JVMTI_THREAD_STATE_IN_OBJECT_WAIT;
state |= JVMTI_THREAD_STATE_WAITING_INDEFINITELY;
state |= JVMTI_THREAD_STATE_WAITING;
/* Object.wait(...) */
} else if (vmstate & J9VMTHREAD_STATE_WAITING_TIMED) {
state |= JVMTI_THREAD_STATE_IN_OBJECT_WAIT;
state |= JVMTI_THREAD_STATE_WAITING_WITH_TIMEOUT;
state |= JVMTI_THREAD_STATE_WAITING;
/* Lock.park() */
} else if (vmstate & J9VMTHREAD_STATE_PARKED) {
state |= JVMTI_THREAD_STATE_PARKED;
state |= JVMTI_THREAD_STATE_WAITING_INDEFINITELY;
state |= JVMTI_THREAD_STATE_WAITING;
/* Lock.park(...) */
} else if (vmstate & J9VMTHREAD_STATE_PARKED_TIMED) {
state |= JVMTI_THREAD_STATE_PARKED;
state |= JVMTI_THREAD_STATE_WAITING_WITH_TIMEOUT;
state |= JVMTI_THREAD_STATE_WAITING;
/* Thread.sleep(...) */
} else if (vmstate & J9VMTHREAD_STATE_SLEEPING) {
state |= JVMTI_THREAD_STATE_SLEEPING;
state |= JVMTI_THREAD_STATE_WAITING_WITH_TIMEOUT;
state |= JVMTI_THREAD_STATE_WAITING;
} else {
state |= JVMTI_THREAD_STATE_RUNNABLE;
}
}
return state;
}
jint
getThreadState(J9VMThread *currentThread, j9object_t threadObject)
{
J9VMThread *vmThread = J9VMJAVALANGTHREAD_THREADREF(currentThread, threadObject);
jint state = getThreadStateHelper(currentThread, threadObject, vmThread);
#if JAVA_SPEC_VERSION >= 19
if (J9_ARE_ANY_BITS_SET(state, JVMTI_THREAD_STATE_RUNNABLE)) {
if ((NULL != vmThread->currentContinuation)
&& (vmThread->threadObject != vmThread->carrierThreadObject)
) {
/* If a virtual thread is mounted on a carrier thread, then the carrier thread
* is considered implicitly parked.
*/
state &= ~JVMTI_THREAD_STATE_RUNNABLE;
state |= JVMTI_THREAD_STATE_WAITING_INDEFINITELY;
state |= JVMTI_THREAD_STATE_WAITING;
}
}
#endif /* JAVA_SPEC_VERSION >= 19 */
return state;
}
#if JAVA_SPEC_VERSION >= 19
jint
getVirtualThreadState(J9VMThread *currentThread, jthread thread)
{
J9JavaVM* vm = currentThread->javaVM;
jint rc = 0;
J9VMThread *targetThread = NULL;
Assert_JVMTI_notNull(thread);
Assert_JVMTI_mustHaveVMAccess(currentThread);
rc = getVMThread(
currentThread, thread, &targetThread, JVMTI_ERROR_NONE,
J9JVMTI_GETVMTHREAD_ERROR_ON_NULL_JTHREAD);
if (JVMTI_ERROR_NONE == rc) {
j9object_t vThreadObject = J9_JNI_UNWRAP_REFERENCE(thread);
if (NULL != targetThread) {
vm->internalVMFunctions->haltThreadForInspection(currentThread, targetThread);
rc = getThreadStateHelper(currentThread, targetThread->carrierThreadObject, targetThread);
vm->internalVMFunctions->resumeThreadForInspection(currentThread, targetThread);
} else {
jint vThreadState = (jint) J9VMJAVALANGVIRTUALTHREAD_STATE(currentThread, vThreadObject);
/* The mapping from JVMTI_VTHREAD_STATE_XXX to JVMTI_JAVA_LANG_THREAD_STATE_XXX is based
* on j.l.VirtualThread.threadState().
*/
switch (vThreadState & ~JVMTI_VTHREAD_STATE_SUSPENDED) {
case JVMTI_VTHREAD_STATE_NEW:
rc = JVMTI_JAVA_LANG_THREAD_STATE_NEW;
break;
case JVMTI_VTHREAD_STATE_STARTED:
{
j9object_t threadContainer = J9VMJAVALANGTHREAD_CONTAINER(currentThread, vThreadObject);
if (NULL == threadContainer) {
rc = JVMTI_JAVA_LANG_THREAD_STATE_NEW;
} else {
rc = JVMTI_JAVA_LANG_THREAD_STATE_RUNNABLE;
}
break;
}
case JVMTI_VTHREAD_STATE_RUNNING:
case JVMTI_VTHREAD_STATE_PARKING:
case JVMTI_VTHREAD_STATE_TIMED_PARKING:
case JVMTI_VTHREAD_STATE_UNPARKED:
case JVMTI_VTHREAD_STATE_YIELDING:
case JVMTI_VTHREAD_STATE_YIELDED:
rc = JVMTI_JAVA_LANG_THREAD_STATE_RUNNABLE;
break;
case JVMTI_VTHREAD_STATE_PINNED:
case JVMTI_VTHREAD_STATE_PARKED:
rc = JVMTI_JAVA_LANG_THREAD_STATE_WAITING | JVMTI_THREAD_STATE_PARKED;
break;
case JVMTI_VTHREAD_STATE_TIMED_PINNED:
case JVMTI_VTHREAD_STATE_TIMED_PARKED:
rc = JVMTI_JAVA_LANG_THREAD_STATE_TIMED_WAITING | JVMTI_THREAD_STATE_PARKED;
break;
case JVMTI_VTHREAD_STATE_TERMINATED:
rc = JVMTI_JAVA_LANG_THREAD_STATE_TERMINATED;
break;
default:
Assert_JVMTI_unreachable();
rc = JVMTI_ERROR_INTERNAL;
}
}
/* Re-fetch object to correctly set the isSuspendedInternal field. */
vThreadObject = J9_JNI_UNWRAP_REFERENCE(thread);
if (0 != J9OBJECT_U32_LOAD(currentThread, vThreadObject, vm->isSuspendedInternalOffset)) {
rc |= JVMTI_THREAD_STATE_SUSPENDED;
} else {
rc &= ~JVMTI_THREAD_STATE_SUSPENDED;
}
releaseVMThread(currentThread, targetThread, thread);
} else {
/* This is unreachable. */
Assert_JVMTI_unreachable();
rc = JVMTI_ERROR_INTERNAL;
}
return rc;
}
#endif /* JAVA_SPEC_VERSION >= 19 */
void
fillInJValue(char signatureType, jvalue * jvaluePtr, void * valueAddress, j9object_t * objectStorage)
{
j9object_t object;
switch (signatureType) {
case 'Z':
jvaluePtr->z = (jboolean) *((I_32 *) valueAddress);
break;
case 'B':
jvaluePtr->b = (jbyte) *((I_32 *) valueAddress);
break;
case 'C':
jvaluePtr->c = (jchar) *((I_32 *) valueAddress);
break;
case 'S':
jvaluePtr->s = (jshort) *((I_32 *) valueAddress);
break;
case 'I':
jvaluePtr->i = (jint) *((I_32 *) valueAddress);
break;
case 'J':
memcpy(&(jvaluePtr->j), valueAddress, 8);
break;
case 'F':
jvaluePtr->f = *((jfloat *) valueAddress);
break;
case 'D':
memcpy(&(jvaluePtr->d), valueAddress, 8);
break;
case 'L':
#if defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES)
case 'Q':
#endif /* defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES) */
object = *((j9object_t*) valueAddress);
if (object == NULL) {
jvaluePtr->l = NULL;
} else {
*objectStorage = object;
jvaluePtr->l = (jobject) objectStorage;
}
break;
}
}
j9object_t
getObjectFromRef(j9object_t * ref)
{
j9object_t result = *ref;
#ifdef J9VM_INTERP_GROWABLE_STACKS
/* See if the ref was redirected */
if (((UDATA) result) & J9_REDIRECTED_REFERENCE) {
result = *((j9object_t*) (((UDATA) result) - J9_REDIRECTED_REFERENCE));
}
#endif
return result;
}
J9Class *
getCurrentClass(J9Class * clazz)
{
return J9_CURRENT_CLASS(clazz);
}
static UDATA
hashObjectTag(void *entry, void *userData)
{
return ((UDATA) ((J9JVMTIObjectTag *) entry)->ref) / sizeof(UDATA);
}
static UDATA
hashEqualObjectTag(void *lhsEntry, void *rhsEntry, void *userData)
{
return (((J9JVMTIObjectTag *) lhsEntry)->ref == ((J9JVMTIObjectTag *) rhsEntry)->ref);
}
static UDATA
watchedClassHash(void *entry, void *userData)
{
return ((UDATA) ((J9JVMTIWatchedClass *) entry)->clazz) / J9_REQUIRED_CLASS_ALIGNMENT;
}
static UDATA
watchedClassEqual(void *lhsEntry, void *rhsEntry, void *userData)
{
return (((J9JVMTIWatchedClass *) lhsEntry)->clazz == ((J9JVMTIWatchedClass *) rhsEntry)->clazz);