[PATCH] D118598: [C++20][Modules][7/8] Find the primary interface name for a module.

[Iain Sandoe via Phabricator via cfe-commits]

iains added inline comments.


================
Comment at: clang/include/clang/Basic/Module.h:523-524
+  std::string getPrimaryModuleInterfaceName() const {
+    std::string::size_type pos = Name.find(':');
+    if (pos == std::string::npos)
+      return Name;
----------------
iains wrote:
> urnathan wrote:
> > haven't you added an IsPartition flag to Module? can't you test that before searching? Also, Almost Always Auto?
> 1) The case we are dealing with is
> 
> we're building `A{,:B}`
> we encounter `:Part`
> 
> So we do not have a module for the importer ('cos we didn't build it yet) but we need to know the primary module name for the imported partition (even to be able to find it).
> 
> So it's a wee bit icky, but we are reduced to manipulating text (none of the content of Module.h is available - we are looking at parser tokens).
> 
> 2) auto and StringRefs - yes probably I could do better.
> 
> The consolation is that this is not an action we'd reasonably expect to be carried out many times c.f. other parser jobs - of course, I'll be proven wrong and someone will import 10^6 partitions ....
> 
 
> (none of the content of Module.h is available - we are looking at parser tokens).

maybe I retract that, at least partially,  we do not have a module (built) - but some of the base information is saved in sema when the module decl is built, so we probably do know if we are building `A:B` or just `A`. 

If we think that this could be a pain point - sema can cache the primary module name and we can then return a StringRef to that.


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D118598/new/

https://reviews.llvm.org/D118598