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Don't import a C++ class definition until the class is required to be complete. (#5865)

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When importing a class definition, ask Clang to complete it first. This
causes class template specializations to get instantiated as needed when
the type-checking of Carbon requires a C++ class to be complete. It also
allows Clang to implement things like modules-aware definition
visibility checking.

Don't reject importing a class with a virtual base if it's never
required to be complete. Instead, defer diagnosing until the definition
is required.

This also removes the recursion from `MapType`, as mapping a class type
no longer maps its definition.

In order to get diagnostics from instantiation failures, fix a bug that
caused any Clang diagnostics produced after the initial building of the
`ASTUnit` to get discarded. This exposed some duplicate diagnostic
issues in `ImportNameFromCpp` which are fixed here too.
This commit is contained in:
Richard Smith
2025-07-30 23:34:18 +00:00
committed by GitHub
parent 14f51d70c2
commit ae16014df8
13 changed files with 353 additions and 82 deletions
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toolchain/check/testdata/interop/cpp/class/class.carbon
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@@ -439,10 +439,10 @@ fn MyF(bar: Cpp.Bar*);
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Bar: type = class_type @Bar [concrete]
// CHECK:STDOUT: %ptr.f68: type = ptr_type %Bar [concrete]
// CHECK:STDOUT: %Bar.elem: type = unbound_element_type %Bar, %ptr.f68 [concrete]
// CHECK:STDOUT: %pattern_type: type = pattern_type %ptr.f68 [concrete]
// CHECK:STDOUT: %MyF.type: type = fn_type @MyF [concrete]
// CHECK:STDOUT: %MyF: %MyF.type = struct_value () [concrete]
// CHECK:STDOUT: %Bar.elem: type = unbound_element_type %Bar, %ptr.f68 [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {