getting parameter information from FunctionDecl class in clang

Question

How to get parameter information as a string from FunctionDecl class in clang . I'm trying but getting confused by so many inheritances. Also they compiler is saying that getReturnType() is not a member of FunctionDecl but doxygen documentation says otherwise . Please help. http://clang.llvm.org/doxygen/classclang_1_1FunctionDecl.html

using namespace std;
using namespace clang;
using namespace clang::driver;
using namespace clang::tooling;
using namespace llvm;

.......
class ExampleVisitor : public RecursiveASTVisitor<ExampleVisitor> 
{
    ......
    virtual bool VisitFunctionDecl(FunctionDecl *func) 
    {
            numFunctions++;
            string funcName = func->getNameInfo().getName().getAsString();
            string retName = func->getReturnType().getAsString();
            ...
            return true;
    }

}

Errors:-

‘class clang::FunctionDecl’ has no member named ‘getReturnType’

Answer 1

Depending if you need a qualified or unqualified name, you can stringify your return type and parameter names as follows

std::string retType = F->getReturnType().getAsString();
std::string arg0;
if(F->getNumParams() > 0)
  arg0 = F->parameters()[0]->getQualifiedNameAsString();

Check out the getAsString() method provided.

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Edit: after your comments I figured out that you don't have the latest Clang source code. Please check it out before retrying. Good luck!