From bfa88bca5ca387d6b3560074050856527cfc7514 Mon Sep 17 00:00:00 2001
From: Dmitriy Ivanov
Date: Tue, 16 Dec 2014 11:40:46 -0800
Subject: Add another test for weak-reference

  This one covers undefined weak reference in .so
  referenced via JUMP_SLOT relocation.

Bug: 17526061
Change-Id: Ib8764bd30c1f686c4818ebbc6683cf42dee908b2---
 tests/dlfcn_test.cpp                 | 14 +++++++++++++-
 tests/libs/Android.mk                |  9 +++++++++
 tests/libs/dlopen_weak_undefined.cpp | 25 +++++++++++++++++++++++++
 3 files changed, 47 insertions(+), 1 deletion(-)
 create mode 100644 tests/libs/dlopen_weak_undefined.cpp

diff --git a/tests/dlfcn_test.cpp b/tests/dlfcn_test.cpp
index c988d29d..6fdfdc75 100644
--- a/tests/dlfcn_test.cpp
+++ b/tests/dlfcn_test.cpp
@@ -819,7 +819,7 @@ TEST(dlfcn, rtld_next_known_symbol) {
 
 TEST(dlfcn, dlsym_weak_func) {
   dlerror();
-  void* handle = dlopen("libtest_dlsym_weak_func.so",RTLD_NOW);
+  void* handle = dlopen("libtest_dlsym_weak_func.so", RTLD_NOW);
   ASSERT_TRUE(handle != NULL);
 
   int (*weak_func)();
@@ -829,6 +829,18 @@ TEST(dlfcn, dlsym_weak_func) {
   dlclose(handle);
 }
 
+TEST(dlfcn, dlopen_undefined_weak_func) {
+  test_isolated([] {
+    void* handle = dlopen("libtest_dlopen_weak_undefined_func.so", RTLD_NOW);
+    ASSERT_TRUE(handle != nullptr) << dlerror();
+    int (*weak_func)();
+    weak_func = reinterpret_cast<int (*)()>(dlsym(handle, "use_weak_undefined_func"));
+    ASSERT_TRUE(weak_func != nullptr) << dlerror();
+    EXPECT_EQ(6551, weak_func());
+    dlclose(handle);
+  });
+}
+
 TEST(dlfcn, dlopen_symlink) {
   void* handle1 = dlopen("libdlext_test.so", RTLD_NOW);
   void* handle2 = dlopen("libdlext_test_v2.so", RTLD_NOW);
diff --git a/tests/libs/Android.mk b/tests/libs/Android.mk
index e4620f57..50d96b2b 100644
--- a/tests/libs/Android.mk
+++ b/tests/libs/Android.mk
@@ -358,3 +358,12 @@ libtest_dlsym_weak_func_src_files := \
 
 module := libtest_dlsym_weak_func
 include $(LOCAL_PATH)/Android.build.testlib.mk
+
+# -----------------------------------------------------------------------------
+# Library with weak undefined function
+# -----------------------------------------------------------------------------
+libtest_dlopen_weak_undefined_func_src_files := \
+    dlopen_weak_undefined.cpp
+
+module := libtest_dlopen_weak_undefined_func
+include $(LOCAL_PATH)/Android.build.testlib.mk
diff --git a/tests/libs/dlopen_weak_undefined.cpp b/tests/libs/dlopen_weak_undefined.cpp
new file mode 100644
index 00000000..599a52e6
--- /dev/null
+++ b/tests/libs/dlopen_weak_undefined.cpp
@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+extern "C" int __attribute__((weak)) weak_undefined_func();
+
+extern "C" int use_weak_undefined_func() {
+  if (weak_undefined_func) {
+    return weak_undefined_func();
+  } else {
+    return 6551;
+  }
+}
-- 
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