I think Jon's trying to build something on top of swiftc or SourceKit. Yes?
You can do something like this to build your own metatype:
ASTContext &ctx = …
Type intTy = ctx.getIntDecl()->getDeclaredType();
auto *intMetaTy = MetatypeType::get(intTy, ctx);
And then compare types using TypeBase::isEqual (which looks through typealiases
and such—it's comparing "canonical" types).
Type unknownTy = …
if (unknownTy->isEqual(intMetaTy)) {
// celebrate
}
Hope that helps,
Jordan
> On Dec 18, 2015, at 13:47 , Slava Pestov via swift-dev <swift-dev@swift.org>
> wrote:
>
> You can probably get the mangled name of the metatype, and refer to that. Eg,
>
> public func f() -> Any.Type {
> return Int.self
> }
>
> f()
>
> Compile this with -emit-ir:
>
> @_TMSi = external global %swift.type, align 8
>
> define %swift.type* @_TF4blah1fFT_PMP_() #0 {
> entry:
> ret %swift.type* @_TMSi
> }
>
> So in your C++ program,
>
> extern "C" {
> extern void *_TMSi;
> }
>
> Note that this is completely unsupported, and probably insane. You have been
> warned.
>
> Slava
>
>> On Dec 18, 2015, at 12:14 PM, Rafkind, Jon via swift-dev
>> <swift-dev@swift.org> wrote:
>>
>> Sorry I should have been more specific. I am working at the C++ level. I
>> have a swift::MetaType* and want to compare it to something.
>>
>> On 12/18/2015 12:10 PM, Dave Abrahams wrote:
>>
>>
>>
>>
>> On Dec 18, 2015, at 11:16 AM, Rafkind, Jon via swift-dev
>> <swift-dev@swift.org><mailto:swift-dev@swift.org> wrote:
>>
>> Given a swift::MetaType how can I tell if it corresponds to the MetaType of
>> the standard Int type? Is there a way to get a reference to the MetaType
>> from the StdlibModule or TheBuiltinModule?
>>
>> For now I can convert the MetaType to a string and compare it to "Int.Type"
>> but that is yucky.
>>
>>
>>
>> Equality comparison works:
>>
>> (swift) String.self == Int.self
>> // r2 : Bool = false
>> (swift) Int.self == Int.self
>> // r3 : Bool = true
>>
>>
>>
>>
>>
>> --
>> _______________________________________________
>> swift-dev mailing list
>> swift-dev@swift.org<mailto:swift-dev@swift.org>
>> https://lists.swift.org/mailman/listinfo/swift-dev
>>
>>
>>
>> -Dave
>>
>>
>>
>>
>>
>>
>> --
>> _______________________________________________
>> swift-dev mailing list
>> swift-dev@swift.org
>> https://lists.swift.org/mailman/listinfo/swift-dev
>
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