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[WASM] callback fron native code to .Net: Parsing function pointer types in signatures is not supported #56145

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[WASM] callback fron native code to .Net: Parsing function pointer types in signatures is not supported#56145
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maraf
Labels
arch-wasmWebAssembly architecturearea-Build-monoarea-Interop-monoblockedIssue/PR is blocked on something - see comments
Milestone
Future

Description

@emepetres
emepetres
opened on Jul 22, 2021

I'm trying to do a call from .Net a native function which call backs to .Net. I'm using function pointers as suggested in discord channel, but I'm getting the following error (maybe related to #43791?):

1:7>Target "_GeneratePInvokeTable: (TargetId:229)" in file "C:\dotnet\packs\Microsoft.NET.Runtime.WebAssembly.Sdk\6.0.0-rc.1.21371.1\Sdk\WasmApp.Native.targets" from project "C:\Users\jcarnero\source\dotnet-wasm-sample\src\console\Wasm.Console.Sample.csproj" (target "_WasmBuildNativeCore" depends on it):
                   Added Item(s): _WasmPInvokeModules=libWasmNative
                   Added Item(s): _WasmPInvokeModules=libSystem.Native
                   Added Item(s): _WasmPInvokeModules=libSystem.IO.Compression.Native
                   Added Item(s): _WasmPInvokeModules=libSystem.Globalization.Native
                   Using "PInvokeTableGenerator" task from assembly "C:\dotnet\packs\Microsoft.NET.Runtime.WebAssembly.Sdk\6.0.0-rc.1.21371.1\Sdk\..\tasks\net6.0\WasmAppBuilder.dll".
                   Task "PInvokeTableGenerator" (TaskId:151)
                     Task Parameter:
                         Assemblies=
                             C:\Users\jcarnero\source\dotnet-wasm-sample\src\console\obj\Debug\net6.0\linked\Wasm.Console.Sample.dll
                             C:\Users\jcarnero\source\dotnet-wasm-sample\src\console\obj\Debug\net6.0\linked\System.Console.dll
                             C:\Users\jcarnero\source\dotnet-wasm-sample\src\console\obj\Debug\net6.0\linked\System.Private.Runtime.InteropServices.JavaScript.dll
                             C:\Users\jcarnero\source\dotnet-wasm-sample\src\console\obj\Debug\net6.0\linked\System.Private.Uri.dll
                             C:\Users\jcarnero\source\dotnet-wasm-sample\src\console\obj\Debug\net6.0\linked\System.Runtime.CompilerServices.Unsafe.dll
                             C:\Users\jcarnero\source\dotnet-wasm-sample\src\console\obj\Debug\net6.0\linked\System.Runtime.dll
                             C:\Users\jcarnero\source\dotnet-wasm-sample\src\console\obj\Debug\net6.0\linked\System.Private.CoreLib.dll (TaskId:151)
                     Task Parameter:OutputPath=C:\Users\jcarnero\source\dotnet-wasm-sample\src\console\obj\Debug\net6.0\wasm\pinvoke-table.h (TaskId:151)
                     Task Parameter:
                         Modules=
                             libWasmNative
                             libSystem.Native
                             libSystem.IO.Compression.Native
                             libSystem.Globalization.Native (TaskId:151)
                     Generating pinvoke table to 'C:\Users\jcarnero\source\dotnet-wasm-sample\src\console\obj\Debug\net6.0\wasm\pinvoke-table.h'. (TaskId:151)
13:27:49.489   1:7>C:\dotnet\packs\Microsoft.NET.Runtime.WebAssembly.Sdk\6.0.0-rc.1.21371.1\Sdk\WasmApp.Native.targets(209,5): error MSB4018: The "PInvokeTableGenerator" task failed unexpectedly. [C:\Users\jcarnero\source\dotnet-wasm-sample\src\console\Wasm.Console.Sample.csproj]
C:\dotnet\packs\Microsoft.NET.Runtime.WebAssembly.Sdk\6.0.0-rc.1.21371.1\Sdk\WasmApp.Native.targets(209,5): error MSB4018: System.NotSupportedException: Parsing function pointer types in signatures is not supported. [C:\Users\jcarnero\source\dotnet-wasm-sample\src\console\Wasm.Console.Sample.csproj]
C:\dotnet\packs\Microsoft.NET.Runtime.WebAssembly.Sdk\6.0.0-rc.1.21371.1\Sdk\WasmApp.Native.targets(209,5): error MSB4018:    at System.Reflection.TypeLoading.Ecma.EcmaModule.GetFunctionPointerType(MethodSignature`1 signature) in System.Reflection.MetadataLoadContext.dll:token 0x6000619+0xa [C:\Users\jcarnero\source\dotnet-wasm-sample\src\console\Wasm.Console.Sample.csproj]
C:\dotnet\packs\Microsoft.NET.Runtime.WebAssembly.Sdk\6.0.0-rc.1.21371.1\Sdk\WasmApp.Native.targets(209,5): error MSB4018:    at System.Reflection.Metadata.Ecma335.SignatureDecoder`2.DecodeType(BlobReader& blobReader, Boolean allowTypeSpecifications, Int32 typeCode) in System.Reflection.Metadata.dll:token 0x6000abf+0x100 [C:\Users\jcarnero\source\dotnet-wasm-sample\src\console\Wasm.Console.Sample.csproj]
C:\dotnet\packs\Microsoft.NET.Runtime.WebAssembly.Sdk\6.0.0-rc.1.21371.1\Sdk\WasmApp.Native.targets(209,5): error MSB4018:    at System.Reflection.Metadata.Ecma335.SignatureDecoder`2.DecodeMethodSignature(BlobReader& blobReader) in System.Reflection.Metadata.dll:token 0x6000ac1+0x5a [C:\Users\jcarnero\source\dotnet-wasm-sample\src\console\Wasm.Console.Sample.csproj]
C:\dotnet\packs\Microsoft.NET.Runtime.WebAssembly.Sdk\6.0.0-rc.1.21371.1\Sdk\WasmApp.Native.targets(209,5): error MSB4018:    at System.Reflection.TypeLoading.Ecma.EcmaMethodDecoder.SpecializeMethodSig(IRoMethodBase roMethodBase) in System.Reflection.MetadataLoadContext.dll:token 0x60005e8+0x0 [C:\Users\jcarnero\source\dotnet-wasm-sample\src\console\Wasm.Console.Sample.csproj]
C:\dotnet\packs\Microsoft.NET.Runtime.WebAssembly.Sdk\6.0.0-rc.1.21371.1\Sdk\WasmApp.Native.targets(209,5): error MSB4018:    at System.Reflection.TypeLoading.RoDefinitionMethod`1.ComputeMethodSig() in System.Reflection.MetadataLoadContext.dll:token 0x6000245+0x7 [C:\Users\jcarnero\source\dotnet-wasm-sample\src\console\Wasm.Console.Sample.csproj]
C:\dotnet\packs\Microsoft.NET.Runtime.WebAssembly.Sdk\6.0.0-rc.1.21371.1\Sdk\WasmApp.Native.targets(209,5): error MSB4018:    at System.Reflection.TypeLoading.RoMethod.get_MethodSig() in System.Reflection.MetadataLoadContext.dll:token 0x6000278+0xc [C:\Users\jcarnero\source\dotnet-wasm-sample\src\console\Wasm.Console.Sample.csproj]
C:\dotnet\packs\Microsoft.NET.Runtime.WebAssembly.Sdk\6.0.0-rc.1.21371.1\Sdk\WasmApp.Native.targets(209,5): error MSB4018:    at System.Reflection.TypeLoading.RoMethod.get_ReturnParameter() in System.Reflection.MetadataLoadContext.dll:token 0x6000276+0x0 [C:\Users\jcarnero\source\dotnet-wasm-sample\src\console\Wasm.Console.Sample.csproj]
C:\dotnet\packs\Microsoft.NET.Runtime.WebAssembly.Sdk\6.0.0-rc.1.21371.1\Sdk\WasmApp.Native.targets(209,5): error MSB4018:    at System.Reflection.TypeLoading.RoMethod.get_ReturnType() in System.Reflection.MetadataLoadContext.dll:token 0x600027d+0x0 [C:\Users\jcarnero\source\dotnet-wasm-sample\src\console\Wasm.Console.Sample.csproj]
C:\dotnet\packs\Microsoft.NET.Runtime.WebAssembly.Sdk\6.0.0-rc.1.21371.1\Sdk\WasmApp.Native.targets(209,5): error MSB4018:    at PInvokeTableGenerator.GenPInvokeDecl(PInvoke pinvoke) in WasmAppBuilder.dll:token 0x6000020+0xc9 [C:\Users\jcarnero\source\dotnet-wasm-sample\src\console\Wasm.Console.Sample.csproj]
C:\dotnet\packs\Microsoft.NET.Runtime.WebAssembly.Sdk\6.0.0-rc.1.21371.1\Sdk\WasmApp.Native.targets(209,5): error MSB4018:    at PInvokeTableGenerator.EmitPInvokeTable(StreamWriter w, Dictionary`2 modules, List`1 pinvokes) in WasmAppBuilder.dll:token 0x600001e+0x59 [C:\Users\jcarnero\source\dotnet-wasm-sample\src\console\Wasm.Console.Sample.csproj]
C:\dotnet\packs\Microsoft.NET.Runtime.WebAssembly.Sdk\6.0.0-rc.1.21371.1\Sdk\WasmApp.Native.targets(209,5): error MSB4018:    at PInvokeTableGenerator.GenPInvokeTable(String[] pinvokeModules, String[] assemblies) in WasmAppBuilder.dll:token 0x600001c+0xaf [C:\Users\jcarnero\source\dotnet-wasm-sample\src\console\Wasm.Console.Sample.csproj]
C:\dotnet\packs\Microsoft.NET.Runtime.WebAssembly.Sdk\6.0.0-rc.1.21371.1\Sdk\WasmApp.Native.targets(209,5): error MSB4018:    at PInvokeTableGenerator.Execute() in WasmAppBuilder.dll:token 0x600001b+0x75 [C:\Users\jcarnero\source\dotnet-wasm-sample\src\console\Wasm.Console.Sample.csproj]
C:\dotnet\packs\Microsoft.NET.Runtime.WebAssembly.Sdk\6.0.0-rc.1.21371.1\Sdk\WasmApp.Native.targets(209,5): error MSB4018:    at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute() in Microsoft.Build.dll:token 0x60015fb+0x3e [C:\Users\jcarnero\source\dotnet-wasm-sample\src\console\Wasm.Console.Sample.csproj]
C:\dotnet\packs\Microsoft.NET.Runtime.WebAssembly.Sdk\6.0.0-rc.1.21371.1\Sdk\WasmApp.Native.targets(209,5): error MSB4018:    at Microsoft.Build.BackEnd.TaskBuilder.ExecuteInstantiatedTask(ITaskExecutionHost taskExecutionHost, TaskLoggingContext taskLoggingContext, TaskHost taskHost, ItemBucket bucket, TaskExecutionMode howToExecuteTask) in Microsoft.Build.dll:token 0x600147a+0x2b5 [C:\Users\jcarnero\source\dotnet-wasm-sample\src\console\Wasm.Console.Sample.csproj]
                   Done executing task "PInvokeTableGenerator" -- FAILED. (TaskId:151)

This are the most relevants parts of the code:

[DllImport(DllName)]
public static extern unsafe void callCbk(delegate*<void> cbk);
typedef void (*callback)(void);

void callCbk(callback cbk)
{
    cbk();
}

And I'm using version

  Microsoft.AspNetCore.App 6.0.0-rc.1.21370.12 [C:\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 6.0.0-rc.1.21369.14 [C:\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.WindowsDesktop.App 6.0.0-rc.1.21369.7 [C:\dotnet\shared\Microsoft.WindowsDesktop.App]

Activity

  1. ghost added
    area-HostModel
    on Jul 22, 2021
  2. ghost added
    untriagedNew issue has not been triaged by the area owner
    on Jul 22, 2021
  4. vitek-karas
    added
    arch-wasmWebAssembly architecture
    on Jul 22, 2021
  6. vitek-karas
    added
    area-Interop-mono
    and removed
    area-HostModel
    on Jul 22, 2021

  7. emepetres commented on Jul 22, 2021

    @emepetres
    emepetres
    on Jul 22, 2021
    Author

    Just for reference, I modified the test to use "old delegates" and MonoPInvokeCallback attribute and it is working,

  8. vargaz commented on Jul 22, 2021

    @vargaz
    vargaz
    on Jul 22, 2021
    Contributor

    #43791

  9. lewing
    modified the milestones: 7.0.0, 6.0.0 on Jul 26, 2021
  10. lewing
    removed
    untriagedNew issue has not been triaged by the area owner
    on Jul 26, 2021
  11. lewing
    assigned
    akoeplinger
    on Aug 4, 2021
  12. lewing
    added
    area-Build-mono
    on Aug 4, 2021

  13. 10 remaining items

  14. emepetres commented on Aug 9, 2022

    @emepetres
    emepetres
    on Aug 9, 2022
    Author

    @devshgraphicsprogramming check my samples, you can find how to do this with MonoPInvokeCallback there.

    https://github.com/emepetres/dotnet-wasm-sample/blob/3967999706c364eb475abf6f09199141a99d096f/src/console-native/Program.cs#L28

  15. devshgraphicsprogramming commented on Oct 21, 2022

    @devshgraphicsprogramming
    devshgraphicsprogramming
    on Oct 21, 2022

    Its a small world of dependencies, this essentially renders SWIG's Cross Language Polymorphism (Directors) feature unusable:
    swig/swig#1262

    Which we really need because C++ interfaces with JS (embind) bindings from which C# inherits is how we're working around:
    dotnet/aspnetcore#44088

  16. maraf
    removed
    blockedIssue/PR is blocked on something - see comments
    on Feb 17, 2023

  17. maraf commented on Feb 23, 2023

    @maraf
    maraf
    on Feb 23, 2023
    Member

    Still blocked until we can update System.Reflection.Metadata in the WasmAppBuilder. Once the API is available, the rest of the pipeline works.

  18. maraf
    added
    blockedIssue/PR is blocked on something - see comments
    on Feb 23, 2023
  19. akoeplinger
    removed their assignment
    on Mar 8, 2023
  20. maraf
    modified the milestones: 8.0.0, Future on Jul 12, 2023

  21. maraf commented on Oct 30, 2023

    @maraf
    maraf
    on Oct 30, 2023
    Member

    An alternative would be to rewrite manage to native generator to use System.Reflection.Metadata API instead of System.Reflection.MetadataLoadContext

  22. agocke
    added this to AppModelon Sep 11, 2024
  23. lewing
    closed this as completedon Jul 20, 2026
  24. lewing
    reopened this on Jul 20, 2026

  25. lewing commented on Jul 20, 2026

    @lewing
    lewing
    on Jul 20, 2026
    Member

    This was fixed in .Net 9 I believe.

  26. lewing
    closed this as completedon Jul 20, 2026
  27. github-actions
    locked and limited conversation to collaborators on Aug 20, 2026
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