8332259: JvmtiTrace::safe_get_thread_name fails if current thread is in native state

Reviewed-by: dholmes, sspitsyn

Author: lmesnik

src/hotspot/share/prims/jvmtiEnter.xsl

@@ -450,6 +450,15 @@ struct jvmtiInterface_1_ jvmti</xsl:text>
       <xsl:value-of select="$space"/>
       <xsl:text>PreserveExceptionMark __em(this_thread);</xsl:text>
     </xsl:if>
+    <xsl:value-of select="$space"/>
+    <xsl:if test="$trace='Trace'">
+      <xsl:text>if (trace_flags) {</xsl:text>
+      <xsl:value-of select="$space"/>
+      <xsl:text>  curr_thread_name = JvmtiTrace::safe_get_current_thread_name();</xsl:text>
+      <xsl:value-of select="$space"/>
+      <xsl:text>}</xsl:text>
+      <xsl:value-of select="$space"/>
+    </xsl:if>
   </xsl:if>
 </xsl:template>
 

src/hotspot/share/prims/jvmtiTrace.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2003, 2023, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2024, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -30,6 +30,7 @@
 #include "memory/resourceArea.hpp"
 #include "prims/jvmtiTrace.hpp"
 #include "runtime/javaThread.hpp"
+#include "runtime/javaThread.inline.hpp"
 
 //
 // class JvmtiTrace
@@ -277,6 +278,12 @@ const char *JvmtiTrace::safe_get_thread_name(Thread *thread) {
   if (!thread->is_Java_thread()) {
     return thread->name();
   }
+  if (Thread::current()->is_Java_thread()) {
+    JavaThreadState current_state = JavaThread::cast(Thread::current())->thread_state();
+    if (current_state == _thread_in_native || current_state == _thread_blocked) {
+      return "not readable";
+    }
+  }
   JavaThread* java_thread = JavaThread::cast(thread);
   oop threadObj = java_thread->jvmti_vthread();
   if (threadObj == nullptr) {