Add more info for attempting to delete non-JNI local reference

Now we print the stack trace of the method which tried to remove the
non-JNI local reference.

Added test, example output:
 Attempt to remove non-JNI local reference, dumping thread
 "main" prio=5 tid=1 Runnable
   | group="main" sCount=0 dsCount=0 obj=0x12c2b400 self=0xf878af28
   | sysTid=32662 nice=0 cgrp=default sched=0/0 handle=0xf73df700
   | state=R schedstat=( 154297228 636505 121 ) utm=5 stm=10 core=11 HZ=100
   | stack=0xff6f2000-0xff6f4000 stackSize=7MB
   | held mutexes= "mutator lock"(shared held)
   native: #00 pc 00455a7f  /out/host/linux-x86/lib/libartd.so (art::DumpNativeStack(std::__1::basic_ostream<char, std::__1::char_traits<char> >&, int, char const*, art::ArtMethod*, void*)+191)
   native: #01 pc 00425d79  /out/host/linux-x86/lib/libartd.so (art::Thread::DumpStack(std::__1::basic_ostream<char, std::__1::char_traits<char> >&) const+473)
   native: #02 pc 0028c555  /out/host/linux-x86/lib/libartd.so (art::IndirectReferenceTable::Remove(unsigned int, void*)+421)
   native: #03 pc 003319c8  /out/host/linux-x86/lib/libartd.so (art::JNI::DeleteLocalRef(_JNIEnv*, _jobject*)+56)
   native: #04 pc 0012db14  /out/host/linux-x86/lib/libartd.so (art::CheckJNI::DeleteRef(char const*, _JNIEnv*, _jobject*, art::IndirectRefKind)+292)
   native: #05 pc 00122176  /out/host/linux-x86/lib/libartd.so (art::CheckJNI::DeleteLocalRef(_JNIEnv*, _jobject*)+54)
   native: #06 pc 00005724  /out/host/linux-x86/lib/libarttest.so (Java_Main_removeLocalObject+36)
   native: #07 pc 00004d6e  /tmp/test-32506/dalvik-cache/x86/tmp@mathieuc@test-32506@004-JniTest.jar@classes.dex (void Main.removeLocalObject(java.lang.Object)+130)
   at Main.removeLocalObject(Native method)
   at Main.testRemoveLocalObject(Main.java:118)
   at Main.main(Main.java:37)

Bug: 20683465
Change-Id: I56b99c77ae7020cabf1aaeb1d5317b1d5ba940e5

2 files changed, 12 insertions, 0 deletions

diff --git a/test/004-JniTest/jni_test.cc b/test/004-JniTest/jni_test.cc
index 71a2b2dddc..ca256ec034 100644
--- a/test/004-JniTest/jni_test.cc
+++ b/test/004-JniTest/jni_test.cc
@@ -258,6 +258,11 @@ extern "C" jchar JNICALL Java_Main_charMethod(JNIEnv*, jclass, jchar c1, jchar c
   return char_returns[c1];
 }
 
+extern "C" JNIEXPORT void JNICALL Java_Main_removeLocalObject(JNIEnv* env, jclass, jclass o) {
+  // Delete the arg to see if it crashes.
+  env->DeleteLocalRef(o);
+}
+
 extern "C" JNIEXPORT jboolean JNICALL Java_Main_nativeIsAssignableFrom(JNIEnv* env, jclass,
                                                                        jclass from, jclass to) {
   return env->IsAssignableFrom(from, to);
diff --git a/test/004-JniTest/src/Main.java b/test/004-JniTest/src/Main.java
index 584fae3a57..a81ec6d748 100644
--- a/test/004-JniTest/src/Main.java
+++ b/test/004-JniTest/src/Main.java
@@ -34,6 +34,7 @@ public class Main {
         testShallowGetStackClass2();
         testCallNonvirtual();
         testNewStringObject();
+        testRemoveLocalObject();
     }
 
     private static native void testFindClassOnAttachedNativeThread();
@@ -111,6 +112,12 @@ public class Main {
       }
     }
 
+    private static native void removeLocalObject(Object o);
+
+    private static void testRemoveLocalObject() {
+        removeLocalObject(new Object());
+    }
+    
     private static native short shortMethod(short s1, short s2, short s3, short s4, short s5, short s6, short s7,
         short s8, short s9, short s10);