re PR libgcj/28178 (jniEnv->DeleteLocalRef (null) fails)

	PR libgcj/28178:
	* jni.cc (_Jv_JNI_DeleteLocalRef): Ignore null argument.
	(_Jv_JNI_DeleteGlobalRef): Likewise.
	* testsuite/libjava.jni/PR28178.java: New file.
	* testsuite/libjava.jni/PR28178.c: New file.
	* testsuite/libjava.jni/PR28178.out: New file.

From-SVN: r115034

libjava/ChangeLog

+2006-06-27  Tom Tromey  <tromey@redhat.com>
+
+	PR libgcj/28178:
+	* jni.cc (_Jv_JNI_DeleteLocalRef): Ignore null argument.
+	(_Jv_JNI_DeleteGlobalRef): Likewise.
+	* testsuite/libjava.jni/PR28178.java: New file.
+	* testsuite/libjava.jni/PR28178.c: New file.
+	* testsuite/libjava.jni/PR28178.out: New file.
+
 2006-06-26  Keith Seitz  <keiths@redhat.com>
 
 	* include/posix-threads.h: Fix coding style aberrations from

libjava/jni.cc

@@ -248,6 +248,12 @@ _Jv_JNI_DeleteGlobalRef (JNIEnv *, jobject obj)
 {
   // This seems weird but I think it is correct.
   obj = unwrap (obj);
+  
+  // NULL is ok here -- the JNI specification doesn't say so, but this
+  // is a no-op.
+  if (! obj)
+    return;
+
   unmark_for_gc (obj, global_ref_table);
 }
 
@@ -259,6 +265,11 @@ _Jv_JNI_DeleteLocalRef (JNIEnv *env, jobject obj)
   // This seems weird but I think it is correct.
   obj = unwrap (obj);
 
+  // NULL is ok here -- the JNI specification doesn't say so, but this
+  // is a no-op.
+  if (! obj)
+    return;
+
   for (frame = env->locals; frame != NULL; frame = frame->next)
     {
       for (int i = 0; i < frame->size; ++i)

libjava/testsuite/libjava.jni/PR28178.c

+#include <PR28178.h>
+
+void
+Java_PR28178_m (JNIEnv *env, jclass ignore)
+{
+  (*env)->DeleteLocalRef(env, NULL);
+  (*env)->DeleteGlobalRef(env, NULL);
+}
+
+

libjava/testsuite/libjava.jni/PR28178.java

+// Regression test for PR 28178.
+
+public class PR28178
+{
+  static {
+    System.loadLibrary("PR28178");
+  }
+
+  public static native void m();
+
+  public static void main(String[] args)
+  {
+    m();
+  }
+}