Print the type of a parameter (ParmVarDecl) with clang API

Question

I need to print the type of a parameter in a C++ source file using the clang API.

If I have a parameter representation in clang (ParmVarDecl* param) I can print the name of the parameter using param->getNameAsString(). I would need a method param->getTypeAsString(), but there is no such method. So is there another way to do this task?

score 26 · Accepted Answer · answered Jul 13 '11 at 18:22

26

Got the answer to my question in the llvm irc:

There is a method std::string clang::QualType::getAsString(SplitQualType split)

So this does work for me:

ParmVarDecl* param = *someParameter;
cout << QualType::getAsString(param->getType().split()) << endl;

answered Jul 13 '11 at 18:22

Baris Akar

4,895
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2

You probably just saved me a week – Steven Lu May 12 '15 at 18:00
1

You certainly saved me the entire night. – Richard Gomes Jun 18 '16 at 22:47
3

You need to add a clang::PrintingPolicy nowadays. Such that the call now looks like: `QualType::getAsString(param->getType().split(), PrintingPolicy{ {} })` – erikzenker Sep 03 '18 at 21:57

Node · Answer 2 · 2011-07-12T22:23:15.727

-5

You can use typeid to get the name of any type. Although it will vary from compiler to compiler, and may not be a pretty name.

#include <iostream>
#include <typeinfo>

struct MyStruct { };

int main()
{
    std::cout << typeid(MyStruct).name() << std::endl;
}

If you need to do this for a lot of classes, you could make the call part of a base class, then any class that needs the functionality can just inherit from it.

#include <iostream>
#include <typeinfo>

class NamedClass
{
  public:
    virtual ~NamedClass() { }

    std::string getNameAsString()
    {
        return typeid(*this).name();
    }
};

class MyStruct : public NamedClass
{
};

int main()
{
    MyStruct ms;
    std::cout << ms.getNameAsString() << std::endl;
}

edited Jul 12 '11 at 22:23

answered Jul 12 '11 at 22:13

Node

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How this is connected to the question asked? The q. was about clang API, he wanted to do this on the clang AST. – Anton Korobeynikov Jul 13 '11 at 09:40
Like Anton wrote, I want to do this with the clang API, so that when I process a source file, I can print functions and their parameter types. But I'll try your answer, maybe I can get use of it. – Baris Akar Jul 13 '11 at 17:23

Print the type of a parameter (ParmVarDecl) with clang API

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