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Improve recovery from bad type imports. (#5953)

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The main change here is that a bad type appearing somewhere within a
field or base class of a class shouldn't cause an import of that class
to fail. Instead, only that field or base class becomes inaccessible
from Carbon.

Also improve the way that type importing errors are diagnosed. While we
lose the precision of a diagnostic saying why a type is not supported,
we gain a useful source location for where the type was mentioned in C++
code.

---------

Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
This commit is contained in:
Richard Smith
2025-08-13 22:07:54 +00:00
committed by GitHub
co-authored by Jon Ross-Perkins
parent 2140a57294
commit b2b0b4a73f
9 changed files with 165 additions and 146 deletions
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toolchain/check/testdata/interop/cpp/class/method.carbon
Vendored
+3 -8
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@@ -57,18 +57,13 @@ fn Value(v: Cpp.HasQualifiers) {
v.plain();
// TODO: This should remain invalid once we support `volatile`.
// CHECK:STDERR: fail_bad_object_param_qualifiers_by_value.carbon:[[@LINE+12]]:3: error: semantics TODO: `Unsupported: qualified type: volatile struct HasQualifiers` [SemanticsTodo]
// CHECK:STDERR: fail_bad_object_param_qualifiers_by_value.carbon:[[@LINE+7]]:3: error: semantics TODO: `Unsupported: object parameter type: volatile struct HasQualifiers` [SemanticsTodo]
// CHECK:STDERR: v.volatile_this();
// CHECK:STDERR: ^~~~~~~~~~~~~~~
// CHECK:STDERR: fail_bad_object_param_qualifiers_by_value.carbon:[[@LINE+9]]:3: note: in `Cpp` name lookup for `volatile_this` [InCppNameLookup]
// CHECK:STDERR: fail_bad_object_param_qualifiers_by_value.carbon:[[@LINE+4]]:3: note: in `Cpp` name lookup for `volatile_this` [InCppNameLookup]
// CHECK:STDERR: v.volatile_this();
// CHECK:STDERR: ^~~~~~~~~~~~~~~
// CHECK:STDERR:
// CHECK:STDERR: fail_bad_object_param_qualifiers_by_value.carbon:[[@LINE+5]]:3: error: `addr self` method cannot be invoked on a value [AddrSelfIsNonRef]
// CHECK:STDERR: v.volatile_this();
// CHECK:STDERR: ^
// CHECK:STDERR: fail_bad_object_param_qualifiers_by_value.carbon: note: initializing function parameter [InCallToFunctionParam]
// CHECK:STDERR:
v.volatile_this();
// CHECK:STDERR: fail_bad_object_param_qualifiers_by_value.carbon:[[@LINE+5]]:3: error: `addr self` method cannot be invoked on a value [AddrSelfIsNonRef]
@@ -105,7 +100,7 @@ import Cpp library "object_param_qualifiers.h";
fn Ref(p: Cpp.HasQualifiers*) {
// TODO: This should eventually be accepted if we support `volatile`.
// CHECK:STDERR: fail_todo_bad_object_param_qualifiers_by_ref.carbon:[[@LINE+7]]:3: error: semantics TODO: `Unsupported: qualified type: volatile struct HasQualifiers` [SemanticsTodo]
// CHECK:STDERR: fail_todo_bad_object_param_qualifiers_by_ref.carbon:[[@LINE+7]]:3: error: semantics TODO: `Unsupported: object parameter type: volatile struct HasQualifiers` [SemanticsTodo]
// CHECK:STDERR: p->volatile_this();
// CHECK:STDERR: ^~~~~~~~~~~~~~~~
// CHECK:STDERR: fail_todo_bad_object_param_qualifiers_by_ref.carbon:[[@LINE+4]]:3: note: in `Cpp` name lookup for `volatile_this` [InCppNameLookup]