[Xamarin.Android.Build.Tasks] Add targets for AOT profiling (#3964)

Fixes: #3792

Context: #3740
Context: #3963

Add the following targets to simplify Profiled AOT usage:

  * `BuildAndStartAotProfiling`
  * `FinishAotProfiling`

The `BuildAndStartAotProfiling` target builds an Application `.csproj`
with the AOT profiler embedded into the `.apk`, installs the `.apk`,
sets the AOT profiler socket port to `$(AndroidAotProfilerPort)`, and
starts the *launch* Activity on the target device.

`$(AndroidAotProfilerPort)` defaults to port 9999.

The `FinishAotProfiling` target attaches to the
`$(AndroidAotProfilerPort)` port, collects the AOT profiler data from
the target device, and writes the collected data into
`$(AndroidAotCustomProfilePath)`.

`$(AndroidAotCustomProfilePath)` defaults to `custom.aprof`.

The use of these two targets allows easily launching an Activity,
waiting for a period of time -- so that process startup can complete,
or so that some set of application behaviors can be included into the
profiled data -- and then collecting the profile.

Author: radekdoulik

Documentation/guides/BuildProcess.md

@@ -119,6 +119,29 @@ The following build targets are defined for Xamarin.Android projects:
     `Resource.designer.cs` file. This target is usually called by the
     IDE when new resources are added to the project.
 
+-   **BuildAndStartAotProfiling** – Builds the package with
+    embedded AOT profiler, sets the AOT profiler socket port to
+    `$(AndroidAotProfilerPort)` and starts the *launch* activity.
+
+    Added in Xamarin.Android v10.3.
+
+-   **FinishAotProfiling** – Collects the AOT profiler data from
+    the device or the emulator through sockets port
+    `$(AndroidAotProfilerPort)` and writes them to
+    `$(AndroidAotCustomProfilePath)`.
+
+    The default values for port and custom profile are `9999` and
+    `custom.aprof`.
+
+    The `aprofutil` call may be extended with
+    `$(AProfUtilExtraOptions)`, to pass additional options.
+
+    This is equivalent to:
+    
+        aprofutil $(AProfUtilExtraOptions) -s -v -f -p $(AndroidAotProfilerPort) -o "$(AndroidAotCustomProfilePath)"
+
+    Added in Xamarin.Android v10.3.
+
 <a name="Build_Extension_Points" />
 
 ## Build Extension Points

Documentation/release-notes/3964.md

@@ -0,0 +1,21 @@
+### Add new AOT profiling targets
+
+The new `BuildAndStartAotProfiling` target builds the package with
+embedded AOT profiler, sets AOT profiler socket port to
+`$(AndroidAotProfilerPort)` and starts the *launch* activity.
+
+The new `FinishAotProfiling` target collects the AOT profiler data
+from the device or the emulator through sockets port
+`$(AndroidAotProfilerPort)` and writes them to
+`$(AndroidAotCustomProfilePath)`.
+
+The default values for port and custom profile are `9999` and
+`custom.aprof`.
+
+The `aprofutil` call may be extended with
+`$(AProfUtilExtraOptions)`, to pass additional options.
+
+This is equivalent to:
+
+    aprofutil $(AProfUtilExtraOptions) -s -v -f -p $(AndroidAotProfilerPort) -o "$(AndroidAotCustomProfilePath)"
+

src/Xamarin.Android.Build.Tasks/Xamarin.Android.Application.targets

@@ -35,4 +35,30 @@ Copyright (C) 2019 Microsoft Corporation. All rights reserved.
     </GetAndroidPackageName>
     <Exec Command="&quot;$(AdbToolPath)adb&quot; $(AdbTarget) shell am force-stop &quot;$(_AndroidPackage)&quot;" />
   </Target>
+  <PropertyGroup>
+    <AndroidAotCustomProfilePath Condition=" '$(AndroidAotCustomProfilePath)' == '' ">custom.aprof</AndroidAotCustomProfilePath>
+    <AndroidAotProfilerPort Condition=" '$(AndroidAotProfilerPort)' == '' ">9999</AndroidAotProfilerPort>
+    <_BeginAotProfilingDependsOnTargets>
+      _SetupAotProfiling;
+      Build;
+      Install;
+      _SetAotProfilingPropsOnDevice;
+      StartAndroidActivity;
+    </_BeginAotProfilingDependsOnTargets>
+  </PropertyGroup>
+  <Target Name="_SetupAotProfiling">
+    <PropertyGroup>
+      <AndroidEmbedProfilers>aot</AndroidEmbedProfilers>
+    </PropertyGroup>
+  </Target>
+  <Target Name="_SetAotProfilingPropsOnDevice">
+    <Exec Command="&quot;$(AdbToolPath)adb&quot; $(AdbTarget) shell setprop debug.mono.profile aot:port=$(AndroidAotProfilerPort)" />
+  </Target>
+  <Target Name="BuildAndStartAotProfiling"
+      DependsOnTargets="$(_BeginAotProfilingDependsOnTargets)">
+  </Target>
+  <Target Name="FinishAotProfiling"
+      DependsOnTargets="_ResolveSdks">
+    <Exec Command="&quot;$(MonoAndroidBinDirectory)aprofutil&quot; $(AProfUtilExtraOptions) -s -v -f -p $(AndroidAotProfilerPort) -o &quot;$(AndroidAotCustomProfilePath)&quot;" />
+  </Target>
 </Project>

src/Xamarin.Android.Build.Tasks/Xamarin.Android.Common.targets

@@ -1171,6 +1171,7 @@ because xbuild doesn't support framework reference assemblies.
 		<_PropertyCacheItems Include="BundleAssemblies=$(BundleAssemblies)" />
 		<_PropertyCacheItems Include="AotAssemblies=$(AotAssemblies)" />
 		<_PropertyCacheItems Include="AndroidAotMode=$(AndroidAotMode)" />
+		<_PropertyCacheItems Include="AndroidEmbedProfilers=$(AndroidEmbedProfilers)" />
 		<_PropertyCacheItems Include="AndroidEnableProfiledAot=$(AndroidEnableProfiledAot)" />
 		<_PropertyCacheItems Include="ExplicitCrunch=$(AndroidExplicitCrunch)" />
 		<_PropertyCacheItems Include="AndroidDexTool=$(AndroidDexTool)" />

tests/MSBuildDeviceIntegration/Tests/AotProfileTests.cs

@@ -0,0 +1,29 @@
+using NUnit.Framework;
+using System.IO;
+using Xamarin.ProjectTools;
+
+namespace Xamarin.Android.Build.Tests
+{
+	public class AotProfileTests : DeviceTest
+	{
+
+		[Test]
+		public void BuildBasicApplicationAndAotProfileIt ()
+		{
+			if (!HasDevices)
+				Assert.Ignore ("Skipping test. No devices available.");
+
+			var proj = new XamarinAndroidApplicationProject () { IsRelease = true };
+			proj.SetProperty (KnownProperties.AndroidSupportedAbis, "armeabi-v7a;x86");
+			var projDirectory = Path.Combine ("temp", TestName);
+			using (var b = CreateApkBuilder (projDirectory)) {
+				Assert.IsTrue (b.RunTarget (proj, "BuildAndStartAotProfiling"), "Run of BuildAndStartAotProfiling should have succeeded.");
+				System.Threading.Thread.Sleep (5000);
+				b.BuildLogFile = "build2.log";
+				Assert.IsTrue (b.RunTarget (proj, "FinishAotProfiling", doNotCleanupOnUpdate: true), "Run of FinishAotProfiling should have succeeded.");
+				var customProfile = Path.Combine (Root, projDirectory, "custom.aprof");
+				FileAssert.Exists (customProfile);
+			}
+		}
+	}
+}