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Add initial support for exporting generic classes (#7595)

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Currently only fields of generic classes are exported; methods of
generic classes are not supported yet.

Simple example:

```carbon
class C(T: type) {
  var t: T;
}

inline Cpp '''
void F() {
  Carbon::C<int> c;
  c.t = 123;

  Carbon::C<float> c2;
  c2.t = 124.5;
}
''';
```
This commit is contained in:
Nicholas Bishop
2026-08-10 17:47:45 +00:00
committed by GitHub
parent 700e42a195
commit de1cd701cf
6 changed files with 496 additions and 134 deletions
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toolchain/check/testdata/interop/cpp/class/export/generic.carbon
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+81
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// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/int.carbon
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/interop/cpp/class/export/generic.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interop/cpp/class/export/generic.carbon
// --- generic_class.carbon
library "[[@TEST_NAME]]";
import Cpp;
class C(T: type) {
var t: T;
}
inline Cpp '''
void F() {
Carbon::C<int> c;
c.t = 123;
}
''';
// --- fail_todo_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;
}
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]
// 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: 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;
}
''';
// --- fail_todo_generic_class_method_call.carbon
library "[[@TEST_NAME]]";
import Cpp;
class C(T: type) {
// CHECK:STDERR: fail_todo_generic_class_method_call.carbon:[[@LINE+4]]:3: error: semantics TODO: `non-class non-namespace name scope` [SemanticsTodo]
// CHECK:STDERR: fn M(unused ref self) {}
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
fn M(unused ref self) {}
}
inline Cpp '''
void F() {
Carbon::C<int> c;
// CHECK:STDERR: fail_todo_generic_class_method_call.carbon:[[@LINE+4]]:5: error: no member named 'M' in 'Carbon::C<int>' [CppInteropParseError]
// CHECK:STDERR: 19 | c.M();
// CHECK:STDERR: | ~ ^
// CHECK:STDERR:
c.M();
}
''';