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Support exporting class specifics to C++ (#7634)

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This is similar to the previously-added support for accessing generic
carbon classes from C++, but with the specific defined by Carbon, rather
than being derived from template args supplied by clang in
`LoadExternalSpecializations`.

Example:
```carbon
class C(T: type) {
  var t: T;
}
alias A = C(i32);

inline Cpp '''
void F() {
  Carbon::A a;
  a.t = 123;
}
'''
```
This commit is contained in:
Nicholas Bishop
2026-08-13 23:30:24 +00:00
committed by GitHub
parent 54b7f1345a
commit 3bb245364f
5 changed files with 125 additions and 54 deletions
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toolchain/check/testdata/interop/cpp/class/export/class.carbon
Vendored
+1 -1
View File
@@ -81,7 +81,7 @@ library "[[@TEST_NAME]]";
import Cpp;
// CHECK:STDERR: fail_todo_monomorphization_failure.carbon:[[@LINE+4]]:1: error: semantics TODO: `interop with specific class` [SemanticsTodo]
// CHECK:STDERR: fail_todo_monomorphization_failure.carbon:[[@LINE+4]]:1: error: semantics TODO: `binding maps to a non-type template parameter` [SemanticsTodo]
// CHECK:STDERR: class B(N: i32) {
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~
// CHECK:STDERR:
toolchain/check/testdata/interop/cpp/class/export/generic.carbon
Vendored
+24 -12
View File
@@ -25,14 +25,10 @@ void F() {
}
''';
// --- fail_todo_specific_alias.carbon
// --- specific_alias.carbon
library "[[@TEST_NAME]]";
import Cpp;
// CHECK:STDERR: fail_todo_specific_alias.carbon:[[@LINE+4]]:1: error: semantics TODO: `interop with specific class` [SemanticsTodo]
// CHECK:STDERR: class C(T: type) {
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
class C(T: type) {
var t: T;
}
@@ -40,20 +36,36 @@ alias A = C(i32);
inline Cpp '''
void F() {
// CHECK:STDERR: fail_todo_specific_alias.carbon:[[@LINE+8]]:11: error: semantics TODO: `interop with unsupported type` [SemanticsTodo]
Carbon::A a;
a.t = 123;
}
''';
// --- fail_unsupported_specific_arg.carbon
library "[[@TEST_NAME]]";
import Cpp;
// CHECK:STDERR: fail_unsupported_specific_arg.carbon:[[@LINE+4]]:1: error: semantics TODO: `failed to map specific type arg to C++` [SemanticsTodo]
// CHECK:STDERR: class C(T: type) {
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
class C(T: type) {
var t: T;
}
alias A = C(());
inline Cpp '''
void F() {
// CHECK:STDERR: fail_unsupported_specific_arg.carbon:[[@LINE+8]]:11: error: semantics TODO: `interop with unsupported type` [SemanticsTodo]
// CHECK:STDERR: Carbon::A a;
// CHECK:STDERR: ^
// CHECK:STDERR:
// CHECK:STDERR: fail_todo_specific_alias.carbon:[[@LINE+4]]:11: error: no type named 'A' in namespace 'Carbon' [CppInteropParseError]
// CHECK:STDERR: fail_unsupported_specific_arg.carbon:[[@LINE+4]]:11: error: no type named 'A' in namespace 'Carbon' [CppInteropParseError]
// CHECK:STDERR: 23 | Carbon::A a;
// CHECK:STDERR: | ~~~~~~~~^
// CHECK:STDERR:
Carbon::A a;
// CHECK:STDERR: fail_todo_specific_alias.carbon:[[@LINE+4]]:3: error: use of undeclared identifier 'c' [CppInteropParseError]
// CHECK:STDERR: 28 | c.t = 123;
// CHECK:STDERR: | ^
// CHECK:STDERR:
c.t = 123;
a.t = 123;
}
''';