[One .NET] Profiled AOT support

Fixes: dotnet#6053

This is still WIP. Still a few pieces missing on the dotnet/runtime to
enable this:

dotnet/runtime#56989

We will need a `libmono-profiler-aot.so` from dotnet/runtime to be
able to record AOT profiles.

For now, I could:

1. Use the `startup.aotprofile` we're already shipping in "legacy"
   Xamarin.Android.
2. Pass this in when `$(AndroidEnableProfiledAot)` is `true`.

~~ Results ~~

All tests:

 1. Were running on a [Google Pixel 5][0], and
 2. Enabled two architectures, arm64 and x86, and
 3. **AOT time** was average of 10 runs with `-c Release
    -p:RunAOTCompilation=true`, with the`Activity: Displayed` time
 4. **Profiled AOT time** was average of 10 runs with `-c Release
    -p:RunAOTCompilation=true -p:AndroidEnableProfiledAot=true` with
    the `Activity: Displayed` time.

| Test                |      AOT time | Profiled AOT time |  AOT apk size | Profiled AOT apk size |
| ------------------- | ------------: | ----------------: | ------------: | --------------------: |
| [HelloAndroid][1]   |  00:00:00.246 |      00:00:00.288 |    12,151,755 |             9,161,675 |
| [HelloMaui][2]      |  00:00:00.619 |      00:00:01.131 |    43,442,233 |            19,992,633 |

From these results, we see that Profiled AOT is AOT'ing *some* of the
assemblies.

We are not getting the best startup time yet, because some methods are
still using the JIT:

    08-06 14:12:34.985 30817 30817 D Mono    : AOT: FOUND method Android.Runtime.JNIEnv:NewGlobalRef (intptr) [0x7ae3c8c620 - 0x7ae3c8c6a0 0x7ae3c9849c]
    08-06 14:12:34.985 30817 30817 D Mono    : AOT: NOT FOUND: intptr:op_Explicit (intptr).
    08-06 14:12:34.985 30817 30817 D Mono    : AOT: NOT FOUND: intptr:op_Explicit (int).
    08-06 14:12:34.986 30817 30817 D Mono    : AOT: FOUND method System.WeakReference`1:.ctor (T,bool) [0x7ae3d8c580 - 0x7ae3d8c5d0 0x7ae3ddaec1]
    08-06 14:12:34.986 30817 30817 D Mono    : AOT: FOUND method System.WeakReference`1:Create (T,bool) [0x7ae3d8c4c0 - 0x7ae3d8c580 0x7ae3ddaebd]
    08-06 14:12:34.986 30817 30817 D Mono    : AOT: NOT FOUND: System.Runtime.InteropServices.GCHandle:Alloc (object,System.Runtime.InteropServices.GCHandleType).
    08-06 14:12:34.986 30817 30817 D Mono    : AOT: NOT FOUND: System.Runtime.InteropServices.GCHandle:Alloc (object,System.Runtime.InteropServices.GCHandleType).
    08-06 14:12:34.986 30817 30817 D Mono    : AOT: NOT FOUND: System.Runtime.InteropServices.GCHandle:.ctor (object,System.Runtime.InteropServices.GCHandleType).

Overall, seems promising, though.

[0]: store.google.com/us/product/pixel_5_specs?hl=en-US
[1]: dotnet/maui-samples@7144604/HelloAndroid
[2]: dotnet/maui-samples@7144604/HelloMaui

build-tools/create-packs/Microsoft.Android.Sdk.proj

@@ -76,6 +76,7 @@ core workload SDK packs imported by WorkloadManifest.targets.
       <_PackageFiles Include="$(XamarinAndroidSourcePath)src\Xamarin.Android.Build.Tasks\Microsoft.Android.Sdk\Sdk\**" PackagePath="Sdk" />
       <_PackageFiles Include="$(XamarinAndroidSourcePath)src\Microsoft.Android.Sdk.ILLink\PreserveLists\**" PackagePath="PreserveLists" />
       <_PackageFiles Include="$(XamarinAndroidSourcePath)src\Xamarin.Android.Build.Tasks\Microsoft.Android.Sdk\targets\**" PackagePath="targets" />
+      <_PackageFiles Include="$(XamarinAndroidSourcePath)src\Xamarin.Android.Build.Tasks\dotnet.aotprofile" PackagePath="targets" />
       <_PackageFiles Include="$(IntermediateOutputPath)UnixFilePermissions.xml" PackagePath="data" Condition=" '$(HostOS)' != 'Windows' " />
       <None Include="$(MSBuildThisFileDirectory)SignList.xml" CopyToOutputDirectory="PreserveNewest" />
     </ItemGroup>

build-tools/installers/create-installers.targets

@@ -116,8 +116,8 @@
   <ItemGroup>
     <_MSBuildFiles Include="$(MSBuildSrcDir)\android-support-multidex.jar" />
     <_MSBuildFiles Include="$(MSBuildSrcDir)\apksigner.jar" />
-    <_MSBuildFiles Include="$(MSBuildSrcDir)\aprofutil.exe"   ExcludeFromAndroidNETSdk="true" />
-    <_MSBuildFiles Include="$(MSBuildSrcDir)\aprofutil.pdb"   ExcludeFromAndroidNETSdk="true" />
+    <_MSBuildFiles Include="$(MSBuildSrcDir)\aprofutil.exe" />
+    <_MSBuildFiles Include="$(MSBuildSrcDir)\aprofutil.pdb" />
     <_MSBuildFiles Include="$(MSBuildSrcDir)\cil-strip.exe"   ExcludeFromAndroidNETSdk="true" />
     <_MSBuildFiles Include="$(MSBuildSrcDir)\cil-strip.pdb"   ExcludeFromAndroidNETSdk="true" />
     <_MSBuildFiles Include="$(MSBuildSrcDir)\class-parse.exe" ExcludeFromAndroidNETSdk="true" />
@@ -355,7 +355,7 @@
     <_MSBuildFilesUnixSignAndHarden Include="$(MSBuildSrcDir)\$(HostOS)\ndk\x86_64-linux-android-strip" />
     <_MSBuildFilesUnix Include="$(MSBuildSrcDir)\$(HostOS)\illinkanalyzer" Permission="755" />
     <_MSBuildFilesUnix Include="$(MSBuildSrcDir)\$(HostOS)\jit-times" Permission="755" />
-    <_MSBuildFilesUnix Include="$(MSBuildSrcDir)\$(HostOS)\aprofutil" ExcludeFromAndroidNETSdk="true" />
+    <_MSBuildFilesUnix Include="$(MSBuildSrcDir)\$(HostOS)\aprofutil" Permission="755" />
     <_MSBuildFilesUnixSignAndHarden Include="$(MSBuildSrcDir)\$(HostOS)\mono" ExcludeFromAndroidNETSdk="true" />
     <_MSBuildFilesUnix Include="$(MSBuildSrcDir)\$(HostOS)\mono.config" />
     <_MSBuildFilesUnix Include="$(MSBuildSrcDir)\$(HostOS)\mono-symbolicate" ExcludeFromAndroidNETSdk="true" />

src/Xamarin.Android.Build.Tasks/Microsoft.Android.Sdk/targets/Microsoft.Android.Sdk.Aot.targets

@@ -69,11 +69,13 @@ They run in a context of an inner build with a single $(RuntimeIdentifier).
           TempDirectory="$([MSBuild]::EnsureTrailingSlash($(_AotOutputDirectory)))%(FileName)"
           AotArguments="$(_AotArguments),temp-path=$([System.IO.Path]::GetFullPath(%(_MonoAOTAssemblies.TempDirectory)))"
       />
+      <AndroidAotProfile Include="$(MSBuildThisFileDirectory)dotnet.aotprofile" Condition=" '$(AndroidEnableProfiledAot)' == 'true' and '$(AndroidUseDefaultAotProfile)' != 'false' " />
     </ItemGroup>
     <MakeDir Directories="$(IntermediateOutputPath)aot\;@(_MonoAOTAssemblies->'%(TempDirectory)')" />
     <MonoAOTCompiler
         Assemblies="@(_MonoAOTAssemblies)"
         CompilerBinaryPath="$(_MonoAOTCompilerPath)"
+        AotProfilePath="@(AndroidAotProfile)"
         DisableParallelAot="$(_DisableParallelAot)"
         LibraryFormat="So"
         Mode="$(AndroidAotMode)"

src/Xamarin.Android.Build.Tasks/Microsoft.Android.Sdk/targets/Microsoft.Android.Sdk.AssemblyResolution.targets

@@ -193,6 +193,7 @@ _ResolveAssemblies MSBuild target.
     <ProcessNativeLibraries
         InputLibraries="@(_ResolvedNativeLibraries)"
         Components="@(_MonoComponent->Distinct())"
+        AndroidEmbedProfilers="$(AndroidEmbedProfilers)"
         IncludeDebugSymbols="$(AndroidIncludeDebugSymbols)">
       <Output TaskParameter="OutputLibraries" ItemName="FrameworkNativeLibrary" />
     </ProcessNativeLibraries>

src/Xamarin.Android.Build.Tasks/Tasks/ProcessNativeLibraries.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using System.Linq;
 using Microsoft.Build.Framework;
 using Microsoft.Android.Build.Tasks;
 
@@ -29,6 +30,8 @@ public class ProcessNativeLibraries : AndroidTask
 
 		public bool IncludeDebugSymbols { get; set; }
 
+		public string [] AndroidEmbedProfilers { get ; set; }
+
 		[Output]
 		public ITaskItem [] OutputLibraries { get; set; }
 
@@ -45,6 +48,8 @@ public override bool RunTask ()
 			}
 
 			var output = new List<ITaskItem> (InputLibraries.Length);
+			bool includeAotProfiler = AndroidEmbedProfilers != null &&
+				AndroidEmbedProfilers.Any (p => string.Equals ("aot", p, StringComparison.OrdinalIgnoreCase) || string.Equals ("all", p, StringComparison.OrdinalIgnoreCase));
 
 			foreach (var library in InputLibraries) {
 				var abi = AndroidRidAbiHelper.GetNativeLibraryAbi (library);
@@ -80,6 +85,11 @@ public override bool RunTask ()
 					if (!wantedComponents.Contains (fileName)) {
 						continue;
 					}
+				} else if (string.Equals ("libmono-profiler-aot", fileName, StringComparison.OrdinalIgnoreCase)) {
+					if (!includeAotProfiler) {
+						Log.LogDebugMessage ($"Excluding '{library.ItemSpec}'. Not included in $(AndroidEmbedProfilers).");
+						continue;
+					}
 				}
 
 				output.Add (library);

src/monodroid/jni/monodroid-glue.cc

@@ -1567,7 +1567,6 @@ MonodroidRuntime::set_trace_options (void)
 	mono_jit_set_trace_options (value.get ());
 }
 
-#if defined (NET6)
 inline void
 MonodroidRuntime::set_profile_options ()
 {
@@ -1582,23 +1581,10 @@ MonodroidRuntime::set_profile_options ()
 		value.assign (prop_value);
 	}
 
+#if defined (NET6)
 	// setenv(3) makes copies of its arguments
 	setenv ("DOTNET_DiagnosticPorts", value.get (), 1);
-}
-#else // def NET6
-inline void
-MonodroidRuntime::set_profile_options ()
-{
-	// We want to avoid dynamic allocation, thus let’s create a buffer that can take both the property value and a
-	// path without allocation
-	dynamic_local_string<SENSIBLE_PATH_MAX + PROPERTY_VALUE_BUFFER_LEN> value;
-	{
-		dynamic_local_string<PROPERTY_VALUE_BUFFER_LEN> prop_value;
-		if (androidSystem.monodroid_get_system_property (Debug::DEBUG_MONO_PROFILE_PROPERTY, prop_value) == 0)
-			return;
-
-		value.assign (prop_value.get (), prop_value.length ());
-	}
+#endif // def NET6
 
 	constexpr char OUTPUT_ARG[] = "output=";
 	constexpr size_t OUTPUT_ARG_LEN = sizeof(OUTPUT_ARG) - 1;
@@ -1673,7 +1659,6 @@ MonodroidRuntime::set_profile_options ()
 	log_warn (LOG_DEFAULT, "Initializing profiler with options: %s", value.get ());
 	debug.monodroid_profiler_load (androidSystem.get_runtime_libdir (), value.get (), output_path.get ());
 }
-#endif // ndef NET6
 
 /*
 Disable LLVM signal handlers.