Use interface, DXC crashed

[johnson3d]

Description use interface simply, dxc will crash,but d3dcompile is ok

interface IQueueReadProxy
{
    void GetReadPos(out uint readPos);
};

struct TtQueueReadProxyTest : IQueueReadProxy
{
    void GetReadPos(out uint readPos)
    {
        readPos = 0;
    }
    uint Dequeue1()
    {
        uint readPos = 0;
        GetReadPos(readPos);
        return (uint)readPos;
    }
};

[numthreads(1, 1, 1)]
void CS_ClusterCullingMain(uint DispatchThreadId : SV_DispatchThreadID)
{
    TtQueueReadProxyTest q;
    uint a = q.Dequeue1();
}

Steps to Reproduce

save code in test.hlsl dxc -E CS_ClusterCullingMain -T cs_6_6 -Fo myshader.bin -Zi -Fd myshader.pdb -D MYDEFINE=1 test.hlsl

Actual Behavior

Internal compiler error: access violation. Attempted to read from address 0x00000000000000A8

Environment

• DXC version <!-- replace with the output of 'dxc --version' --> dxcompiler.dll: 1.8 - 1.7.0.4386 (a743e97f8)
• Host Operating System <!--- Host operating system and version ---> win10

[llvm-beanz]

The interface keyword is not supported in HLSL 2016 and later (the versions supported by DXC).

The compiler should not crash, but this code is not valid modern HLSL.

[johnson3d]

The interface keyword is not supported in HLSL 2016 and later (the versions supported by DXC).

The compiler should not crash, but this code is not valid modern HLSL.

I see, so i must use template to do that?

[llvm-beanz]

I see, so i must use template to do that?

If you're using HLSL 2021+ you can use C++ template patterns with SFINAE to get similar results to the legacy interface feature, but aspects of HLSL interface objects are just not supported in HLSL anymore. Specifically, interface objects could be resolved late at PSO creation time. In modern HLSL, all function calls must be resolved at compile time, unless you're building a lib target in which case the rules are a bit more complicated.