ART: Do not JNI abort on nullptr GetObjectRefType

A nullptr is a valid input, as it is different from a null reference.

Bug: 18820997
Change-Id: Ibda8907ba13b20d2055049492a356ffdf4ddc714

2 files changed, 15 insertions, 9 deletions

diff --git a/runtime/jni_internal.cc b/runtime/jni_internal.cc
index 4797e69..37ad46e 100644
--- a/runtime/jni_internal.cc
+++ b/runtime/jni_internal.cc
@@ -2256,8 +2256,10 @@ class JNI {
         java_buffer, WellKnownClasses::java_nio_DirectByteBuffer_capacity));
   }
 
-  static jobjectRefType GetObjectRefType(JNIEnv* env, jobject java_object) {
-    CHECK_NON_NULL_ARGUMENT_RETURN(java_object, JNIInvalidRefType);
+  static jobjectRefType GetObjectRefType(JNIEnv* env ATTRIBUTE_UNUSED, jobject java_object) {
+    if (java_object == nullptr) {
+      return JNIInvalidRefType;
+    }
 
     // Do we definitely know what kind of reference this is?
     IndirectRef ref = reinterpret_cast<IndirectRef>(java_object);
@@ -2274,7 +2276,7 @@ class JNI {
       return JNILocalRefType;
     }
     LOG(FATAL) << "IndirectRefKind[" << kind << "]";
-    return JNIInvalidRefType;
+    UNREACHABLE();
   }
 
  private:
diff --git a/runtime/jni_internal_test.cc b/runtime/jni_internal_test.cc
index 045fe2f..8e32968 100644
--- a/runtime/jni_internal_test.cc
+++ b/runtime/jni_internal_test.cc
@@ -1300,16 +1300,20 @@ TEST_F(JniInternalTest, GetObjectRefType) {
   jweak weak_global = env_->NewWeakGlobalRef(local);
   EXPECT_EQ(JNIWeakGlobalRefType, env_->GetObjectRefType(weak_global));
 
-  CheckJniAbortCatcher jni_abort_catcher;
-  jobject invalid = reinterpret_cast<jobject>(this);
-  EXPECT_EQ(JNIInvalidRefType, env_->GetObjectRefType(invalid));
-  jni_abort_catcher.Check("use of invalid jobject");
+  {
+    CheckJniAbortCatcher jni_abort_catcher;
+    jobject invalid = reinterpret_cast<jobject>(this);
+    EXPECT_EQ(JNIInvalidRefType, env_->GetObjectRefType(invalid));
+    jni_abort_catcher.Check("use of invalid jobject");
+  }
 
   // TODO: invoke a native method and test that its arguments are considered local references.
 
-  // Null as object should fail.
+  // Null as pointer should not fail and return invalid-ref. b/18820997
   EXPECT_EQ(JNIInvalidRefType, env_->GetObjectRefType(nullptr));
-  jni_abort_catcher.Check("java_object == null");
+
+  // TODO: Null as reference should return the original type.
+  // This requires running a GC so a non-null object gets freed.
 }
 
 TEST_F(JniInternalTest, StaleWeakGlobal) {