Storing Decl nodes in Clang AST

Question

I'm trying to store all FunctionDecl nodes in a vector so that I can visit them in the future. The use case would for stepping into functions (e.g. function a calls function b, I want to be able to call VisitDecl on the function b node)

Storing of all these nodes are done in the HandleTopLevelDecl within ASTConsumer:

std::vector<Decl> vec;

virtual bool HandleTopLevelDecl (DeclGroupRef DG) {
  for (DeclGroupRef::iterator i = DG.begin(), e = DG.end(); i != e; ++i) {
    Decl *D = *i;
    vec.push_back(*D);
  }
}

However, during compilation there is an error '~Decl' is a protected member of 'clang::Decl'

Anyone can shed some light on this?

AlexDenisov AlexDenisov · Accepted Answer · 2016-06-15T07:29:11

The problem is that you are putting a copy of Decl instance into your array. Creation and deletion of these objects is responsibility of other class, hence you can only have a reference to an instance.

Here is proper solution for your problem:

std::vector<Decl *> vec;

virtual bool HandleTopLevelDecl (DeclGroupRef DG) {
  for (DeclGroupRef::iterator i = DG.begin(), e = DG.end(); i != e; ++i) {
    Decl *D = *i;
    vec.push_back(D);
  }
}

Storing Decl nodes in Clang AST

1 Answers