[cfe-dev] using clang - getting type for C variable declaration

[Rajendra]

Hi,

1) I need to get type as string from Expr object. Any pointers?

   Expr* lhs = E->getLHS();

   if (strcmp(lhs->getStmtClassName(), "DeclRefExpr") == 0)
   {
     // get name and type for Expr *lhs from DeclRefExpr
     const DeclRefExpr *declRefExpr = dyn_cast<DeclRefExpr>(lhs);

     const ValueDecl *valueDecl = declRefExpr->getDecl();

     if (valueDecl)
     {
       std::cerr << "\tLHS identifier = " << 
valueDecl->getNameAsString() << "\n"; // this gives x

       QualType declQT = valueDecl->getType();
       std::cerr << "\tqual type: ";
       declQT.dump();  // this prints  : int identifier

       // now call QualType.getAsString(PrintingPolicy &Policy)
       // ---> how to get compiler instance and AST context? <---- //
       clang::ASTContext &context = 
compilerInstance_ptr->getASTContext();
       std::cerr << "\ttype: " << 
declQT.getAsString(context.getPrintingPolicy()) << "\n";
     }
   }

2) Here is how I got things right for Decl :) this will be helpful for 
others as well.

   clang::DeclGroupRef::iterator it;

   for (it = declGroupRef.begin(); it != declGroupRef.end(); it++)
   {
     clang::Decl* decl = *it;

     const NamedDecl *namedDecl = dyn_cast<NamedDecl>(decl);

     if (namedDecl)
     {
       std::cerr << "\tidentifier name = "
         << namedDecl->getNameAsString() << "\n";
     }

     const ValueDecl *valueDecl = dyn_cast<ValueDecl>(decl);

     if (valueDecl)
     {
       QualType declQT = valueDecl->getType();

       // now call QualType.getAsString(PrintingPolicy &Policy)
       clang::ASTContext &context = decl->getASTContext();
       std::cerr << "\ttype = " << 
declQT.getAsString(context.getPrintingPolicy()) << "\n";
     }
   }


Rajendra