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[iOS] Fix trimming warnings in HttpClientHandler.AnyMobile #91520

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merged 3 commits into from
Sep 8, 2023
Merged

[iOS] Fix trimming warnings in HttpClientHandler.AnyMobile #91520

merged 3 commits into from
Sep 8, 2023

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simonrozsival
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@simonrozsival simonrozsival commented Sep 3, 2023 •
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While testing NativeAOT on iOS, I started noticed this warning from ILC:

ILC : Trim analysis warning IL2075: System.Net.Http.HttpClientHandler.InvokeNativeHandlerMethod(String,Object[]): 'this' argument does not satisfy 'DynamicallyAccessedMemberTypes.PublicMethods' in call to 'System.Type.GetMethod(String)'. The return value of method 'System.Object.GetType()' does not have matching annotations. The source value must declare at least the same requirements as those declared on the target location it is assigned to.

This PR fixes the warning.

@ghost ghost assigned simonrozsival Sep 3, 2023
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ghost commented Sep 3, 2023

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Issue Details

While testing NativeAOT on iOS, I started noticed this warning from ILC:

ILC : Trim analysis warning IL2075: System.Net.Http.HttpClientHandler.InvokeNativeHandlerMethod(String,Object[]): 'this' argument does not satisfy 'DynamicallyAccessedMemberTypes.PublicMethods' in call to 'System.Type.GetMethod(String)'. The return value of method 'System.Object.GetType()' does not have matching annotations. The source value must declare at least the same requirements as those declared on the target location it is assigned to.

All the methods which call InvokeNativeHandlerMethod are annotated with DynamicDependency attributes and so the warning we get from ILC can be suppressed.

Author: simonrozsival
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area-System.Net.Http, os-ios
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/azp run runtime-ioslike

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/azp run runtime-extra-platforms

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@MichalStrehovsky MichalStrehovsky added the linkable-framework Issues associated with delivering a linker friendly framework label Sep 7, 2023
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ghost commented Sep 7, 2023

Tagging subscribers to 'linkable-framework': @eerhardt, @vitek-karas, @LakshanF, @sbomer, @joperezr, @marek-safar
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Issue Details

While testing NativeAOT on iOS, I started noticed this warning from ILC:

ILC : Trim analysis warning IL2075: System.Net.Http.HttpClientHandler.InvokeNativeHandlerMethod(String,Object[]): 'this' argument does not satisfy 'DynamicallyAccessedMemberTypes.PublicMethods' in call to 'System.Type.GetMethod(String)'. The return value of method 'System.Object.GetType()' does not have matching annotations. The source value must declare at least the same requirements as those declared on the target location it is assigned to.

All the methods which call InvokeNativeHandlerMethod are annotated with DynamicDependency attributes and so the warning we get from ILC can be suppressed.

Author: simonrozsival
Assignees: simonrozsival
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area-System.Net.Http, linkable-framework, os-ios
Milestone: -

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We typically write targeted trimming tests if there is a suppression. Suppressions are not great because someone could add a new callsite and forget to add DynamicDependency (or DynamicDependency the wrong thing).

I think this can be rewritten to be correct by construction. All the text strings are there, they're just too far apart for analysis to figure them out.

Basically, I'd do this:

  • Delete all the DynamicDependency stuff.
  • Replace _nativeHandler!.GetType()!.GetMethod(name); in InvokeNativeHandlerMethod with Type.GetType(NativeHandlerType + ", " + AssemblyName)!.GetMethod(name);. The C# compiler will concatenate these strings because they're all consts.
  • This is already enough to make everything work. Trimming will keep all public methods on the type and there will be no warning. This is because the name of the type is visible within the InvokeNativeHandlerMethod method.
  • If there is a size concern (we don't want to keep all the public methods on this type), we could hoist the Type.GetType(NativeHandlerType + ", " + AssemblyName)!.GetMethod(name); part into a delegate (add an Action<MethodInfo> delegate parameter to InvokeNativeHandlerMethod and provide the right implementation at each callsite as a lambda). This should result in comparable size to what was achieved with DynamicDependency (the attributes are not cheap, size-wise - it's a lot of characters and none of them can be shared even though they're identical because custom attributes are encoded that way).

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@MichalStrehovsky thanks for the suggestion!

@simonrozsival simonrozsival marked this pull request as draft September 7, 2023 13:46
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/azp run runtime-ioslike

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Looks great! (Reviewing from the trimmability perspective only.)

Cc @AaronRobinsonMSFT - I think this is a nice candidate for #90081. We'll be able to simplify all of this and get rid of the reflection.

@simonrozsival simonrozsival changed the title [iOS] Unconditionally suppress trimming warnings in HttpClientHandler [iOS] Fix trimming warnings in HttpClientHandler.AnyMobile Sep 8, 2023
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/azp run runtime-android

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@simonrozsival simonrozsival marked this pull request as ready for review September 8, 2023 08:46
@simonrozsival simonrozsival merged commit 7f06d1c into dotnet:main Sep 8, 2023
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@simonrozsival simonrozsival deleted the http-client-handler-anymobile-suppress-ilc-warning branch September 8, 2023 19:07
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/backport to release/8.0-rc1

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github-actions bot commented Sep 9, 2023

Started backporting to release/8.0-rc1: https://github.com/dotnet/runtime/actions/runs/6130417198

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Was release/8.0-rc1 correct or should it have been release/8.0 instead?

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@stephentoub you're right, it shouldn't be RC1. I'll open a new backport.

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/backport to release/8.0

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Started backporting to release/8.0: https://github.com/dotnet/runtime/actions/runs/6145796878

@github-actions github-actions bot mentioned this pull request Sep 11, 2023
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marek-safar reviewed Sep 12, 2023
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...aries/System.Net.Http/src/System/Net/Http/HttpClientHandler.AnyMobile.InvokeNativeHandler.cs
InvokeNativeHandlerMethod(getMethod, parameters: new object?[] { value }, cachingKey!);
}

private object InvokeNativeHandlerMethod(Func<MethodInfo> getMethod, object?[]? parameters, string cachingKey)
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Why is it not static?

...aries/System.Net.Http/src/System/Net/Http/HttpClientHandler.AnyMobile.InvokeNativeHandler.cs

private object InvokeNativeHandlerGetter(Func<MethodInfo> getMethod, [CallerMemberName] string? cachingKey = null)
{
return InvokeNativeHandlerMethod(getMethod, parameters: null, cachingKey!);
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Please add Debug.Assert instead of only !

...aries/System.Net.Http/src/System/Net/Http/HttpClientHandler.AnyMobile.InvokeNativeHandler.cs
[DynamicDependency("set_Credentials", NativeHandlerType, AssemblyName)]
private void SetCredentials(ICredentials? value) => InvokeNativeHandlerMethod("set_Credentials", value);
private void SetCredentials(ICredentials? value)
=> InvokeNativeHandlerSetter(() => Type.GetType(NativeHandlerType)!.GetMethod("set_Credentials")!, value);
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Perhaps Type.GetType(NativeHandlerType) could come as an argument to the lambda and you could cache it too.

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As far as I understand it, by keeping the GetType and GetMethod calls together with constant arguments will give the trimmer enough information to keep only the methods that are actually used. If we cached the type, I think it wouldn't be trimmable anymore.

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That's true. We don't have a way to do this with caching the Type (without suppressing some warnings).
Once we have UnsafeAccessorType then this can be rewritten to use that and it will not use any reflection and be faster.

...aries/System.Net.Http/src/System/Net/Http/HttpClientHandler.AnyMobile.InvokeNativeHandler.cs
[DynamicDependency("set_Credentials", NativeHandlerType, AssemblyName)]
private void SetCredentials(ICredentials? value) => InvokeNativeHandlerMethod("set_Credentials", value);
private void SetCredentials(ICredentials? value)
=> InvokeNativeHandlerSetter(() => Type.GetType(NativeHandlerType)!.GetMethod("set_Credentials")!, value);
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All the lambdas should be static (not sure why the analyzer does not complain).

...aries/System.Net.Http/src/System/Net/Http/HttpClientHandler.AnyMobile.InvokeNativeHandler.cs
@@ -156,5 +153,36 @@ private static HttpMessageHandler CreateNativeHandler()

return (HttpMessageHandler)_nativeHandlerMethod!.Invoke(null, null)!;
}

private object InvokeNativeHandlerGetter(Func<MethodInfo> getMethod, [CallerMemberName] string? cachingKey = null)
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Perhaps we could use CallerLineNumberAttribute or some other key which is not a next string in the assembly

@simonrozsival simonrozsival mentioned this pull request Sep 14, 2023
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@karelz karelz added this to the 9.0.0 milestone Sep 14, 2023
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@akoeplinger akoeplinger akoeplinger approved these changes

@steveisok steveisok Awaiting requested review from steveisok

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