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Perform component-wise substitution of pack expansions immediately.

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Substitution of a pack expansion type may now produce a pack type.
We immediately expand that pack when transforming a tuple, a function
parameter, or a pack.

I had to duplicate the component-wise transformation logic in the
simplifyType transform, which I'm not pleased about, but a little
code duplication seemed a lot better than trying to unify the code
in two very different places.

I think we're very close to being able to assert that pack expansion
shapes are either pack archetypes or pack parameters; unfortunately,
the pack matchers intentionally produce expansions of packs, and I
didn't want to add that to an already-large patch.
This commit is contained in:
John McCall
2023-03-25 18:46:29 -04:00
parent d16fed6e9a
commit c041d1061a
9 changed files with 398 additions and 386 deletions
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6
lib/AST/ParameterPack.cpp
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@@ -449,15 +449,15 @@ PackType *PackType::get(const ASTContext &C,
auto arg = args[i];
if (params[i]->isParameterPack()) {
wrappedArgs.push_back(PackExpansionType::get(
arg, arg->getReducedShape()));
auto argPackElements = arg->castTo<PackType>()->getElementTypes();
wrappedArgs.append(argPackElements.begin(), argPackElements.end());
continue;
}
wrappedArgs.push_back(arg);
}
return get(C, wrappedArgs)->flattenPackTypes();
return get(C, wrappedArgs);
}
PackType *PackType::getSingletonPackExpansion(Type param) {