Access TIntermediate with public headers

[timiimit]

Main issue

After calling TShader::parse() I have been using:

shader->getIntermediate()->getNumEntryPoints();
shader->getIntermediate()->getNumErrors();

when converting HLSL to SPIRV because TShader::parse() sometimes still succeeded in some undesirable cases. For example when entry points don't exist. So I used getIntermediate() to do extra checking. But that's no longer possible since the removal of some public header files.

Is there another way to do this?

Extra question

Another thing that I wasn't yet using, but was planning to in the future is glslang::TIntermTraverser to do some extra application-specific code checks.

class MyTraverser : public glslang::TIntermTraverser { ... };

auto* root = shader->getIntermediate()->getTreeRoot();
MyTraverser traverser;
root->traverse(&traverser);

So I would also like to know if this is something that will not be possible or if this was removed by mistake.

[timiimit]

Maybe it would be helpful to describe the compile & link approach I've been using.

Pseudocode:

hlsl = read_file()
for each of 5 shader stages
{
    stage = new TShader(stages[i]);
    stage->setStringsWithLengthsAndNames(hlsl)
    stage->setEntryPoint(entryPointNames[i])
    success = stage->parse()
    entrypoints = stage->getIntermediate()->getNumEntryPoints()
    errors = stage->getIntermediate()->getNumErrors()
    if (entrypoints != 1 || entrypoints != 0)
        success = false

    if (success)
        program.addShader(stage)
}
program.link()

It should be noted that hlsl source might not contain entrypoints of all shader stages. So I cannot just do addShader for all shader stages, because then linking will fail with errors such as this:

Linked geometry stage:

WARNING: Linking geometry stage: Entry point not found
ERROR: Linking geometry stage: At least one shader must specify an input layout primitive
ERROR: Linking geometry stage: At least one shader must specify an output layout primitive
ERROR: Linking geometry stage: At least one shader must specify a layout(max_vertices = value)

[timiimit]

Right after writing previous comment, I thought of a different approach. Now I tried to create separate TProgram for each TShader. So that I can compile and link each stage individually.

But it seems that now I encountered another problem where Domain shader stage (EShLangTessEvaluation) does not need an entrypoint to compile and link. So both compilation and linking is successful and spirv is generated. Also spirv-cross seems to be able to convert it to glsl. But it only generates this

#version 460

void main()
{
}

This glsl then fails to link for real in OpenGL when being used as a tesselation evaluation shader with error message:

Tessellation evaluation info
----------------------------
Internal error: assembly compile error for tessellation evaluation shader at offset 228:
-- error message --
line 10, column 1:  error: program missing TESS_MODE declaration
-- internal assembly text --
!!NVtep5.0
OPTION NV_internal;
OPTION NV_bindless_texture;
# cgc version 3.4.0001, build date Feb 22 2024
# command line args: 
#vendor NVIDIA Corporation
#version 3.4.0.1 COP Build Date Feb 22 2024
#profile gp5tp
#program main
TEMP T;
END
# 0 instructions, 0 R-regs

Since I have never used this stage I don't really know what is and isn't considered valid. As a temporary workaround I added

if (currentShaderStage == EShLangTessEvaluation && spirv.size() < 512)
    continue;

after glslang::GlslangToSpv because it seems to always produce small spirv.