libbinder_ndk: stability settings

Allow apex/vendor users to set stability.

Bug: 136027762
Test: binderStabilityTest
Test: manually creating a vendor service and
    checking for expected behavior
Change-Id: Icbf8b2fdb8af00a64fcbf7a1c2c29e640ac9da29
diff --git a/libs/binder/ndk/Android.bp b/libs/binder/ndk/Android.bp
index 6da3086..1beacdf 100644
--- a/libs/binder/ndk/Android.bp
+++ b/libs/binder/ndk/Android.bp
@@ -33,6 +33,7 @@
         "ibinder_jni.cpp",
         "parcel.cpp",
         "process.cpp",
+        "stability.cpp",
         "status.cpp",
         "service_manager.cpp",
     ],
@@ -54,7 +55,7 @@
     version_script: "libbinder_ndk.map.txt",
     stubs: {
         symbol_file: "libbinder_ndk.map.txt",
-        versions: ["29"],
+        versions: ["29", "30"],
     },
 }
 
diff --git a/libs/binder/ndk/include_apex/android/binder_stability.h b/libs/binder/ndk/include_apex/android/binder_stability.h
new file mode 100644
index 0000000..e6aeb04
--- /dev/null
+++ b/libs/binder/ndk/include_apex/android/binder_stability.h
@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2019 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.
+ */
+
+#pragma once
+
+#include <android/binder_ibinder.h>
+
+__BEGIN_DECLS
+
+#ifdef __ANDROID_VNDK__
+
+/**
+ * This interface has the stability of the vendor image.
+ */
+void AIBinder_markVendorStability(AIBinder* binder);
+
+static inline void AIBinder_markCompilationUnitStability(AIBinder* binder) {
+    AIBinder_markVendorStability(binder);
+}
+
+#else  // ndef defined __ANDROID_VNDK__
+
+/**
+ * This interface has the stability of the system image.
+ */
+void AIBinder_markSystemStability(AIBinder* binder);
+
+static inline void AIBinder_markCompilationUnitStability(AIBinder* binder) {
+    AIBinder_markSystemStability(binder);
+}
+
+#endif  // ifdef __ANDROID_VNDK__
+
+/**
+ * This interface has system<->vendor stability
+ */
+void AIBinder_markVintfStability(AIBinder* binder);
+
+__END_DECLS
diff --git a/libs/binder/ndk/libbinder_ndk.map.txt b/libs/binder/ndk/libbinder_ndk.map.txt
index 4f685d1..feedde6 100644
--- a/libs/binder/ndk/libbinder_ndk.map.txt
+++ b/libs/binder/ndk/libbinder_ndk.map.txt
@@ -98,3 +98,12 @@
   local:
     *;
 };
+
+LIBBINDER_NDK30 { # introduced=30
+  global:
+    AIBinder_markSystemStability; # apex
+    AIBinder_markVendorStability; # vndk
+    AIBinder_markVintfStability; # apex vndk
+  local:
+    *;
+};
diff --git a/libs/binder/ndk/stability.cpp b/libs/binder/ndk/stability.cpp
new file mode 100644
index 0000000..abafe1f
--- /dev/null
+++ b/libs/binder/ndk/stability.cpp
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2019 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.
+ */
+
+#include <android/binder_stability.h>
+
+#include <binder/Stability.h>
+#include "ibinder_internal.h"
+
+#include <log/log.h>
+
+using ::android::internal::Stability;
+
+#ifdef __ANDROID_VNDK__
+#error libbinder_ndk should only be built in a system context
+#endif
+
+// explicit extern because symbol is only declared in header when __ANDROID_VNDK__
+extern "C" void AIBinder_markVendorStability(AIBinder* binder) {
+    Stability::markVndk(binder->getBinder().get());
+}
+
+void AIBinder_markSystemStability(AIBinder* binder) {
+    Stability::markCompilationUnit(binder->getBinder().get());
+}
+
+void AIBinder_markVintfStability(AIBinder* binder) {
+    Stability::markVintf(binder->getBinder().get());
+}