AST - collecting used VarDecl

[plekakis]

Hello,

I am looking into using the IDxcIntelliSense interface to collect information about used global variables and structures,however after spending quite a bit of time on this, it seems harder than I thought.

Given a IDxcCursor pointing to some variable declaration, is there a way to find if this is actually used in the sourcecode? Looking into the text file generated by "ast-dump" cmdline option, I can see that it's correctly marking such declarations as "used", but fail to see how this is done.

Take the following minimal example:

float g_param;
float g_unused_param;

float4 pixelshader() : SV_Target0
{
    return g_param.xxxx;
}

-ast-dump correctly only marks "g_param" as used, however I can't find a way to detect this using the API.

Thank you in advance