[cfe-dev] Static Function return variable not parsed correctly.

John McCall rjmccall at apple.com
Mon Feb 4 14:57:57 PST 2013


On Feb 4, 2013, at 2:40 PM, gladtbx <gao2 at illinois.edu> wrote:

> Hello all.
> 
> When I am using clang to process a c file, the return type of a static
> function cannot be recognized.
> For example´╝î I have a function:
> static int32_t handle_memory_buttons (int32_t key, double* value)
> 
> I use 
> 
> type_ptr = ND->getResultType().getTypePtr()
> 
> to get the return value type info. 
> 
> type_ptr->isBuiltinType()
> 
> returns true. But
> 
> llvm::dyn_cast<BuiltinType>(type_ptr)
> 
> returns null and 

int32_t is not a BuiltinType;  it is a TypedefType whose underlying type
is a BuiltinType.

Clang does provide functions that ignore this first level of type "sugar":
  type->getAs<...>() // analogous to dyn_cast<...>
  type->castAs<...>() // analogous to cast<...>

John.



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