Processing Macro Arguments

Hi all,

I’m trying to find the arguments given to a macro with a specific name, but I have not had any luck. I’m still fairly new to Clang, so if anyone has any advice, I’d be happy to hear it.

Given the following code, I get absolutely nothing from output:

(Assume we used a matcher to get every expr):

ASTContext* ast = /* AST Context */;

If(const Expr* expr = Result.Nodes.getNodeAsclang::Expr(“expr”)){

auto& SM = ast->getSourceManager();

auto loc = expr->getLocStart();


const auto expLoc = SM.getImmediateExpansionRange(loc).first;

const auto name = Lexer::getImmediateMacroName(expLoc, SM, ast->getLangOpts());

if(name == “MACRO_NAME”){

Token tok;


std::cout << cpp->getSpelling(tok) << std::endl;





I was thinking that I could use matchers to match against all expressions, then filter for macros with the isMacroArgExpansion(loc) check, then filter for the macros I care about with getImmediateMacroName(). What am I missing here? Is the issue in how I jump from the macro to tokens?