JVM_CreateThreadSnapshot should now throw instead of returning null

Author: gilles-duboscq

espresso/src/com.oracle.truffle.espresso.mokapot/src/mokapot.c

@@ -1754,8 +1754,8 @@ JNIEXPORT jboolean JNICALL JVM_PrintWarningAtDynamicAgentLoad(void) {
 }
 
 JNIEXPORT jobject JNICALL JVM_CreateThreadSnapshot(JNIEnv* env, jobject thread) {
-    UNIMPLEMENTED(JVM_CreateThreadSnapshot);
-    return NULL;
+  IMPLEMENTED(JVM_CreateThreadSnapshot);
+  return (*getEnv())->JVM_CreateThreadSnapshot(env, thread);
 }
 
 

espresso/src/com.oracle.truffle.espresso/src/com/oracle/truffle/espresso/vm/VM.java

@@ -3521,6 +3521,12 @@ public int JNI_GetCreatedJavaVMs(@Pointer TruffleObject vmBufPtr, int bufLen, @P
         return getMeta().getAllocator().wrapArrayAs(getMeta().java_lang_Thread.getArrayKlass(), threads);
     }
 
+    @VmImpl(isJni = true)
+    public static @JavaType(internalName = "Ljdk/internal/vm/ThreadSnapshot;") StaticObject JVM_CreateThreadSnapshot(@SuppressWarnings("unused") @JavaType(Thread.class) StaticObject thread,
+                    @Inject Meta meta) {
+        throw meta.throwException(meta.java_lang_UnsupportedOperationException);
+    }
+
     // endregion threads
 
     // region Management