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Even though Truth-ila isn't planning on developing it further it does work nicely. I'm just going to document some compile issues if anyone is building this or glslang on VS. I used the 2010 versions of the StandAlone and glslang and had to rip out the Bison precompile step. Just run it manually once. You also have to add a SPIRV project and build that lib. Once that compiles create the ShaderTune project exactly the same as StandAlone. I only had a couple issues with ShaderTune. If you have .frag files with /r/n line endings you need to adjust the code in loadAndCalc because size and read will not be equal. I also had to move the code from ShaderParser.CPP to CostCalcuator::CostCalculator or that shader data would simply go out of scope.

I think "rb" would work fine or just use if(read>0)buffer[read]=0. In StandAlone they find the character length reading the whole file char at a time then repositioning to the beginning. It is all the same - these are small files.

Here is a better explanation of the other error.

In CostCalculator...
Shader shader=Shader::parsefile(blah blah); //I don't remember the exact syntax

In ShaderParser.cpp ...
Shader::parsefile(blah blah){
  Shader shader;
  ...
  shader.parse(blah blah);//everything is fine after this line, shader has been loaded and the InfoSink and Tree are loaded.
  return shader;
}//everything is lost here as the variable shader goes out of scope with the end of the function

I tried ...

static Shader shader; //and that helped a bit but I still got an error later in the cost calcs so I just dumped the code into CostCalculator and everything was fine.