[PATCH] Add const to input parameter for JNU_IsInstanceOfByName

[Andrew Luo]

Hi Everyone,

I'm making some const-correctness fixes to some downstream libraries that use 
JNU_* functions, and noticed that JNU_IsInstanceOfByName takes in the class 
name by char* instead of const char* when it does not need to modify the 
string.  It would be useful to change this so that we don't have to 
(unnecessarily) const-cast every time and can safely pass string literals to 
this function.  Patch is inline below - any comments/feedback welcome.

Thanks,

-Andrew

diff -r 70fab3a8ff02 src/java.base/share/native/libjava/jni_util.c
--- a/src/java.base/share/native/libjava/jni_util.c    Tue Jul 16 07:29:12 2019 
+0900
+++ b/src/java.base/share/native/libjava/jni_util.c    Mon Jul 15 16:07:35 2019 
-0700
@@ -1096,7 +1096,7 @@
}

JNIEXPORT jint JNICALL
-JNU_IsInstanceOfByName(JNIEnv *env, jobject object, char* classname)
+JNU_IsInstanceOfByName(JNIEnv *env, jobject object, const char* classname)
{
     jclass cls;
     if ((*env)->EnsureLocalCapacity(env, 1) < 0)
diff -r 70fab3a8ff02 src/java.base/share/native/libjava/jni_util.h
--- a/src/java.base/share/native/libjava/jni_util.h    Tue Jul 16 07:29:12 2019 
+0900
+++ b/src/java.base/share/native/libjava/jni_util.h    Mon Jul 15 16:07:35 2019 
-0700
@@ -208,7 +208,7 @@
  * has been thrown.
  */
JNIEXPORT jint JNICALL
-JNU_IsInstanceOfByName(JNIEnv *env, jobject object, char *classname);
+JNU_IsInstanceOfByName(JNIEnv *env, jobject object, const char *classname);


/* Get or set class and instance fields.