Question: Migrating to OOP - DIBuilder

[yowl]

Are there OOP equivalents for the DIBuilder funcitons, .e.g. LLVMCreateDIBuilder, LLVMDIBuilderCreateCompileUnit, LLVMDIBuilderCreateFile, LLVMDIBuilderCreateDebugLocation ?

[tannergooding]

Not currently.

There are a number of the "raw" APIs that don't have the minimal wrapper bindings yet. If they existed they would be defined here: https://github.com/microsoft/LLVMSharp/blob/master/sources/LLVMSharp/Interop.Extensions/LLVMDIBuilderRef.cs

PRs are more than welcome if you would like to try adding them. Otherwise, I should (hopefully) be getting to it sometime this month.

[yowl]

Sure, I can do a PR for the ones I create. Any idea how I should create the LLVMOpaqueContext ** for DIBuilderCreateSubroutineType . I mean it looks like a pointer to an c style array, but how do I do that from c#, pinning GCHandles?

[tannergooding]

For ClangSharp, I had been returning or taking Span<>/ReadOnlySpan<>.

You can see https://github.com/microsoft/ClangSharp/blob/ff9e62f98b047d7f2142c807be6be548afcd74e6/sources/ClangSharp/Interop.Extensions/CXCursor.cs#L168, https://github.com/microsoft/ClangSharp/blob/2321198c105452a52275a452e0e91c3d65bf4574/sources/ClangSharp/Interop.Extensions/CXTranslationUnit.cs#L221, and https://github.com/microsoft/ClangSharp/blob/2321198c105452a52275a452e0e91c3d65bf4574/sources/ClangSharp/Interop.Extensions/CXTranslationUnit.cs#L115 for examples.

So,

[DllImport(LibraryPath, CallingConvention = CallingConvention.Cdecl, EntryPoint = "LLVMDIBuilderCreateSubroutineType", ExactSpelling = true)]
[return: NativeTypeName("LLVMMetadataRef")]
public static extern LLVMOpaqueMetadata* DIBuilderCreateSubroutineType([NativeTypeName("LLVMDIBuilderRef")] LLVMOpaqueDIBuilder* Builder, [NativeTypeName("LLVMMetadataRef")] LLVMOpaqueMetadata* File, [NativeTypeName("LLVMMetadataRef *")] LLVMOpaqueMetadata** ParameterTypes, [NativeTypeName("unsigned int")] uint NumParameterTypes, LLVMDIFlags Flags);

would be something like:

public LLVMMetadataRef CreateSubroutineType(LLVMMetadataRef File, ReadOnlySpan<LLVMMetadataRef> ParameterTypes, LLVMDIFlags Flags)
{
    fixed (LLVMMetadataRef* pParameterTypes = ParameterTypes)
    {
        LLVM.DIBuilderCreateSubroutineType(this, File, (LLVMOpaqueMetadata**)pParameterTypes, (uint)ParameterTypes.Length, Flags);
    }
}

[yowl]

Thanks, I'm sure I'll have more questions, but can take them up in the PR.