SF: Introduce libsurfaceflinger_unittest
This is meant to be a framework for running function-level unit tests
against the various SurfaceFlinger classes.
The point of this patch is to set up the test framework, as well as
demonstrate a pattern to be used to allow private implementation
functions to be tested.
Note that this patch configures the base surfaceflinger code to now use
ThinLTO, and enables -fwhole-program-vtables. This is done as ThinLTO
with that option will perform a devirtualization pass, turning virtual
function calls back into non-virtual function calls (and possibly even
inlining the call) when it detects that there is only one possible
implementation being called. The cost is a slight increase in build time
(similar to -O2), but is still much less than the original LTO.
Even here that LTO pass does something to the surfaceflinger binary,
reducing the file size by 4Kb.
Test: libsurfaceflinger_unittest passes on Pixel XL
Test: atest libsurfaceflinger_unittest runs the new test
Bug: None
Change-Id: I362ec1fcf1a909c4d6769710d8d8a6b0b158600d
diff --git a/services/surfaceflinger/tests/unittests/TestableSurfaceFlinger.h b/services/surfaceflinger/tests/unittests/TestableSurfaceFlinger.h
new file mode 100644
index 0000000..4aa59a5
--- /dev/null
+++ b/services/surfaceflinger/tests/unittests/TestableSurfaceFlinger.h
@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2018 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 "DisplayDevice.h"
+#include "SurfaceFlinger.h"
+
+namespace android {
+
+class TestableSurfaceFlinger {
+public:
+ // Extend this as needed for accessing SurfaceFlinger private (and public)
+ // functions.
+
+ /* ------------------------------------------------------------------------
+ * Forwarding for functions being tested
+ */
+ auto getDefaultDisplayDeviceLocked() const { return mFlinger->getDefaultDisplayDeviceLocked(); }
+
+ auto processDisplayChangesLocked() { return mFlinger->processDisplayChangesLocked(); }
+
+ /* ------------------------------------------------------------------------
+ * Read-write access to private data to set up preconditions and assert
+ * post-conditions.
+ */
+ auto& mutableBuiltinDisplays() { return mFlinger->mBuiltinDisplays; }
+
+ sp<SurfaceFlinger> mFlinger = new SurfaceFlinger();
+};
+
+} // namespace android