[cfe-dev] How to now step into macro while using RecursiveASTVisitor?

[rayjcwu]

I have a simple file

#define square(x) ((x)*(x))
int main() {
  square(3);
  return 0;
}

The ast-dump by clang is:

TranslationUnitDecl 0x3fcc0e0 <<invalid sloc>>
|-TypedefDecl 0x3fcc5e0 <<invalid sloc>> __int128_t '__int128'
|-TypedefDecl 0x3fcc640 <<invalid sloc>> __uint128_t 'unsigned __int128'
|-TypedefDecl 0x3fcc990 <<invalid sloc>> __builtin_va_list '__va_list_tag
[1]'
`-FunctionDecl 0x3fcca30 <test.c:2:1, line:5:1> main 'int ()'
  `-CompoundStmt 0x3fccbd8 <line:2:12, line:5:1>
    |-ParenExpr 0x3fccb78 <line:1:19, col:27> 'int'
    | `-BinaryOperator 0x3fccb50 <col:20, col:26> 'int' '*'
    |   |-ParenExpr 0x3fccaf0 <col:20, col:22> 'int'
    |   | `-IntegerLiteral 0x3fccad0 <line:3:10> 'int' 3
    |   `-ParenExpr 0x3fccb30 <line:1:24, col:26> 'int'
    |     `-IntegerLiteral 0x3fccb10 <line:3:10> 'int' 3
    `-ReturnStmt 0x3fccbb8 <line:4:3, col:10>
      `-IntegerLiteral 0x3fccb98 <col:10> 'int' 0

I use  

bool VisitStmt(Stmt * stmt) {
   const SourceManager &SM = astContext->getSourceManager();
   SourceLocation startLoc = stmt->getLocStart();
   if (Lexer::isAtStartOfMacroExpansion(startLoc, SM,
astContext->getLangOpts())) { 
      cout << "is start of macro expansion" << endl;
   }
   return true;
}

and it could tell me it meets a macro when visiting ParenExpr 0x3fccb78. 
I only want to know there is a macro and skip to next statement, but I can't
return boolean value of "is macro or not" for VisitStmt. Otherwise ast
visitor will stop without visiting ReturnStmt.
So how do I skip visiting children of ParenExpr and go to its sibling?





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