Yes those lines represent nodes. You do not necessarily need ASTContext to look at a node’s descendants: you can just use the node’s methods.
Were these sugar (= syntax-only) type nodes, you could iterate over the child of each successive node via `desugar()`, and successively desugar while searching for a Type subclass T via `getAs<T>()`.
But pointee types/array element types are of course not sugar: they are distinct semantic entities, so desugar/getAs won’t will not pass through them. Hence your problem.
Fortunately there seems to be a `getPointeeOrArrayElementType()` to help peel off the semantic layers you want to look through, analogous to `desugar()` — but unfortunately there is not a `getAs` analog for this case, so you have to write the search manually.
Something like this should work (not tested):
```
PointerType *getInnermostPointerType(const Type *T) {
const PointerType *res = nullptr;
while (true) {
const Type *pointeeOrElement = T->getPointeeOrArrayElementType();
if (pointeeOrElement == T)
// T is neither a pointer nor array type: we’re done.
break;
// T is a pointer or array type.
if (isa<PointerType>(T))
res = cast<PointerType>(T);
// iterate T, keep looking
T = pointeeOrElement;
}
return res;
}
```
On Oct 30, 2020, at 2:12 PM, Pratyush Das via cfe-dev <
[hidden email]> wrote:
Hi,
If I dump() a clang::Type object, I can see this AST representation -
ConstantArrayType 0x555562830ea0 'const char **const [0]' 0
`-QualType 0x555562830c81 'const char **const' const
`-PointerType 0x555562830c80 'const char **'
`-PointerType 0x5555627ed2a0 'const char *'
`-QualType 0x5555627ec7d1 'const char' const
`-BuiltinType 0x5555627ec7d0 'char'
Is there a way to use the ASTContext to iterate over each node? (Do each of those lines represent a node?)
My motivation is to get the inner most PointerType object.
Regards,
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