Yes, context.getIntDecl() was exactly what I was looking for. Thank you Jordan!
On 12/18/2015 08:49 PM, Jordan Rose wrote:
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<mailto: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
<<mailto:swift-dev@swift.org>swift-dev@swift.org<mailto: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>><<mailto: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
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-Dave
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