clang - comparing constructs in clang AST parser

Question

While parsing an ASTVisitor in Clang in sample codes, I see there constructs to verify statements eg.

isa<IfStmt>(statement) 
isa<UnaryOperator>(Expression)

Is there a comprehensive list of such constructs which are used to evaluate a current expression/statement.

Thanks

Answer 1

First of all, there's nothing magical about isa, that's just LLVM's way of checking whether an object is a subtype of some class; the expression isa<IfStmt>(statement) is basically equivalent to this RTTI-enabled expression:

dynamic_cast<IfStmt*>(statement) != NULL

So your question really boils down to what the AST hierarchy is; and for that, it's best to check these four pages, with complete hierarchy chart:

• Type's hierarchy
• Decl's hierarchy
• DeclContext's hierarchy
• Stmt's hierarchy (this includes Expr and its children)