ART: Add slow-debug test in 004-JniTest

Ensure that run-tests (in debug mode) run with slow flags enabled.

Bug: 35644369
Test: m test-art-host
Change-Id: Ib2146ee7f20fad484c86d967113e38bb1d6ed075

2 files changed, 20 insertions, 0 deletions

diff --git a/test/004-JniTest/jni_test.cc b/test/004-JniTest/jni_test.cc
index 81be531e44..f2edd0f688 100644
--- a/test/004-JniTest/jni_test.cc
+++ b/test/004-JniTest/jni_test.cc
@@ -775,5 +775,18 @@ static jint Java_Main_intCriticalNativeMethod(jint a, jint b, jint c) {
   return a + b + c;
 }
 
+extern "C" JNIEXPORT jboolean JNICALL Java_Main_isSlowDebug(JNIEnv*, jclass) {
+  // Return whether slow-debug is on. Only relevant for debug builds.
+  if (kIsDebugBuild) {
+    // Register a dummy flag and get the default value it should be initialized with.
+    static bool dummy_flag = false;
+    dummy_flag = RegisterRuntimeDebugFlag(&dummy_flag);
+
+    return dummy_flag ? JNI_TRUE : JNI_FALSE;
+  }
+  // To pass the Java-side test, just so "on" for release builds.
+  return JNI_TRUE;
+}
+
 }  // namespace art
 
diff --git a/test/004-JniTest/src/Main.java b/test/004-JniTest/src/Main.java
index bb098e44dc..0c4ed89f81 100644
--- a/test/004-JniTest/src/Main.java
+++ b/test/004-JniTest/src/Main.java
@@ -24,6 +24,11 @@ import dalvik.annotation.optimization.FastNative;
 public class Main {
     public static void main(String[] args) {
         System.loadLibrary(args[0]);
+
+        if (!isSlowDebug()) {
+          throw new RuntimeException("Slow-debug flags unexpectedly off.");
+        }
+
         testFindClassOnAttachedNativeThread();
         testFindFieldOnAttachedNativeThread();
         testReflectFieldGetFromAttachedNativeThreadNative();
@@ -307,6 +312,8 @@ public class Main {
         }
       }
     }
+
+    private static native boolean isSlowDebug();
 }
 
 @FunctionalInterface