Add Exception message to Xdump stack agent output

When Xdump:stack is used to dump stack trace filtered on an exception,
this change along with the primary exception message, displays
additional detail about the exception if any. This is similar to how
javacore displays additional detail about an exception in 1TISIGINFO
tag.

Fixes: eclipse-openj9#8435
Signed-off-by: Kabir Islam <kaislam1@in.ibm.com>

runtime/rasdump/trigger.c

@@ -908,6 +908,12 @@ omr_error_t
 triggerDumpAgents(struct J9JavaVM *vm, struct J9VMThread *self, UDATA eventFlags, struct J9RASdumpEventData *eventData)
 {
  J9RASdumpQueue *queue;
+ j9object_t emessage = NULL;
+ char stackBuffer[256];
+ char* buf = stackBuffer;
+ UDATA len = 0;
+ char* subDetailedMessage = NULL;
+ UDATA subLength = 0;
 
  /* we lock the dump configuration here so that the agent and setting queues can't be
  * changed underneath us while we're producing the dumps
@@ -1004,7 +1010,32 @@ triggerDumpAgents(struct J9JavaVM *vm, struct J9VMThread *self, UDATA eventFlags
  OMRPORT_ACCESS_FROM_J9PORT(PORTLIB);
  char dateStamp[64];
  omrstr_ftime_ex(dateStamp, sizeof(dateStamp), "%Y/%m/%d %H:%M:%S", now, OMRSTR_FTIME_FLAG_LOCAL);
- j9nls_printf(PORTLIB, J9NLS_INFO | J9NLS_STDERR | J9NLS_VITAL, J9NLS_DMP_PROCESSING_EVENT_TIME, mapDumpEvent(eventFlags), detailLength, detailData, dateStamp);
+
+ /*If there is more details about the event, print it.
+ * During abort event detailData is empty string - skip the abort event */
+ if (strcmp (detailData,"") && eventData->exceptionRef && *eventData->exceptionRef) {
+ emessage = J9VMJAVALANGTHROWABLE_DETAILMESSAGE(self, *eventData->exceptionRef);
+ if (NULL != emessage) {
+ subLength = strlen (detailData) + strlen ("\" \"");
+ subDetailedMessage = (char *)j9mem_allocate_memory(subLength+1, OMRMEM_CATEGORY_VM);
+ strcpy (subDetailedMessage, detailData);
+ strcat (subDetailedMessage,"\" \"");
+ buf = self->javaVM->internalVMFunctions->copyStringToUTF8WithMemAlloc(self, emessage, J9_STR_NULL_TERMINATE_RESULT, subDetailedMessage, subLength, stackBuffer, 256, &len);
+ if (NULL != buf) {
+ j9nls_printf(PORTLIB, J9NLS_INFO | J9NLS_STDERR | J9NLS_VITAL, J9NLS_DMP_PROCESSING_EVENT_TIME, mapDumpEvent(eventFlags), strlen (buf), buf, dateStamp);
+ }
+ }
+ if (buf != stackBuffer) {
+ j9mem_free_memory(buf);
+ }
+ if (NULL != subDetailedMessage) {
+ j9mem_free_memory(subDetailedMessage);
+ }
+ }
+ else {
+ j9nls_printf(PORTLIB, J9NLS_INFO | J9NLS_STDERR | J9NLS_VITAL, J9NLS_DMP_PROCESSING_EVENT_TIME, mapDumpEvent(eventFlags), detailLength, detailData, dateStamp);
+ }
+
  printed = 1;
  }
  }