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carbon-lang/toolchain/check/testdata/interop/cpp/namespace.carbon
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Richard Smith 36f0a73092 Initial support for interop with class/struct/union fields. (#5849) 
Add a new type, `custom_layout_type`, representing a struct type whose
size, alignment, and field offsets can be manually controlled. Use this
as the object representation type for imported C++ class types (which
also includes struct and union types), allowing us to model C++ class
type layouts. In passing, also add support for incomplete C++ class
types, mapping them into incomplete Carbon class types.

Map C++ fields into Carbon field declarations, allowing direct access to
C++ fields from Carbon. So far, no support is added for base classes nor
anonymous struct or union declarations; those will be added in
subsequent PRs. Also, we don't map C++ access control into Carbon yet,
so all C++ fields are accessible regardless of their access control.

For now we still use a `struct_type` as the object representation for
empty C++ classes, in order to continue to support our existing tests
that convert `{}` to empty C++ class types. This is temporary and should
be removed once we support interop with C++ class initialization.
2025-07-25 21:09:24 +00:00

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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/destroy.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/namespace.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interop/cpp/namespace.carbon
// ============================================================================
// Single
// ============================================================================
// --- single.h
namespace my_namespace { void foo(); }
// --- import_single.carbon
library "[[@TEST_NAME]]";
import Cpp library "single.h";
fn MyF() {
//@dump-sem-ir-begin
Cpp.my_namespace.foo();
//@dump-sem-ir-end
}
// --- fail_import_namespace_wrong_member_name.carbon
library "[[@TEST_NAME]]";
import Cpp library "single.h";
fn MyF() {
// CHECK:STDERR: fail_import_namespace_wrong_member_name.carbon:[[@LINE+4]]:3: error: member name `not_foo` not found in `Cpp.my_namespace` [MemberNameNotFoundInInstScope]
// CHECK:STDERR: Cpp.my_namespace.not_foo();
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
Cpp.my_namespace.not_foo();
}
// --- fail_import_namespace_wrong_name.carbon
library "[[@TEST_NAME]]";
import Cpp library "single.h";
fn MyF() {
// CHECK:STDERR: fail_import_namespace_wrong_name.carbon:[[@LINE+4]]:3: error: member name `not_my_namespace` not found in `Cpp` [MemberNameNotFoundInInstScope]
// CHECK:STDERR: Cpp.not_my_namespace.foo();
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
Cpp.not_my_namespace.foo();
}
// ============================================================================
// Multiple
// ============================================================================
// --- multiple.h
namespace my_namespace1 {
void foo1();
namespace my_namespace2 {
void foo2();
namespace my_namespace3 {
void foo3();
}
}
}
// --- import_multiple.carbon
library "[[@TEST_NAME]]";
import Cpp library "multiple.h";
fn MyF() {
//@dump-sem-ir-begin
Cpp.my_namespace1.foo1();
Cpp.my_namespace1.my_namespace2.foo2();
Cpp.my_namespace1.my_namespace2.my_namespace3.foo3();
//@dump-sem-ir-end
}
// ============================================================================
// Inline namespace
// ============================================================================
// --- inline.h
inline namespace { namespace N { inline namespace { void foo(); } } }
// --- import_inline.carbon
library "[[@TEST_NAME]]";
import Cpp library "inline.h";
fn MyF() {
//@dump-sem-ir-begin
Cpp.N.foo();
//@dump-sem-ir-end
}
// ============================================================================
// Inline namespace triggers ambiguity
// ============================================================================
// --- inline_ambiguity.h
namespace N { void foo(); }
inline namespace { namespace N {} }
// --- fail_import_inline_ambiguity.carbon
library "[[@TEST_NAME]]";
import Cpp library "inline_ambiguity.h";
fn MyF() {
// CHECK:STDERR: fail_import_inline_ambiguity.carbon:[[@LINE+7]]:3: error: semantics TODO: `Unsupported: Lookup succeeded but couldn't find a single result; LookupResultKind: 5` [SemanticsTodo]
// CHECK:STDERR: Cpp.N.foo();
// CHECK:STDERR: ^~~~~
// CHECK:STDERR: fail_import_inline_ambiguity.carbon:[[@LINE+4]]:3: note: in `Cpp` name lookup for `N` [InCppNameLookup]
// CHECK:STDERR: Cpp.N.foo();
// CHECK:STDERR: ^~~~~
// CHECK:STDERR:
Cpp.N.foo();
}
// ============================================================================
// Inline namespace ambiguity not triggered
// ============================================================================
// --- inline_ambiguity_not_triggered.h
namespace N { struct X {}; }
auto foo() -> N::X;
inline namespace { namespace N {} }
// --- import_inline_ambiguity_not_triggered.carbon
library "[[@TEST_NAME]]";
import Cpp library "inline_ambiguity_not_triggered.h";
fn MyF() {
//@dump-sem-ir-begin
Cpp.foo();
//@dump-sem-ir-end
}
// ============================================================================
// Carbon keyword name
// ============================================================================
// --- special_name.h
namespace base { void foo(); }
// --- fail_import_special_name_call_unescpaed.carbon
library "[[@TEST_NAME]]";
import Cpp library "special_name.h";
fn MyF() {
// CHECK:STDERR: fail_import_special_name_call_unescpaed.carbon:[[@LINE+4]]:3: error: member name `base` not found in `Cpp` [MemberNameNotFoundInInstScope]
// CHECK:STDERR: Cpp.base.foo();
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR:
Cpp.base.foo();
}
// --- import_special_name_call_escpaed.carbon
library "[[@TEST_NAME]]";
import Cpp library "special_name.h";
fn MyF() {
//@dump-sem-ir-begin
Cpp.r#base.foo();
//@dump-sem-ir-end
}
// CHECK:STDOUT: --- import_single.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %foo.type: type = fn_type @foo [concrete]
// CHECK:STDOUT: %foo: %foo.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .my_namespace = %my_namespace
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %my_namespace: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .foo = %foo.decl
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %foo.decl: %foo.type = fn_decl @foo [concrete = constants.%foo] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @MyF() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %my_namespace.ref: <namespace> = name_ref my_namespace, imports.%my_namespace [concrete = imports.%my_namespace]
// CHECK:STDOUT: %foo.ref: %foo.type = name_ref foo, imports.%foo.decl [concrete = constants.%foo]
// CHECK:STDOUT: %foo.call: init %empty_tuple.type = call %foo.ref()
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- import_multiple.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %foo1.type: type = fn_type @foo1 [concrete]
// CHECK:STDOUT: %foo1: %foo1.type = struct_value () [concrete]
// CHECK:STDOUT: %foo2.type: type = fn_type @foo2 [concrete]
// CHECK:STDOUT: %foo2: %foo2.type = struct_value () [concrete]
// CHECK:STDOUT: %foo3.type: type = fn_type @foo3 [concrete]
// CHECK:STDOUT: %foo3: %foo3.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .my_namespace1 = %my_namespace1
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %my_namespace1: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .foo1 = %foo1.decl
// CHECK:STDOUT: .my_namespace2 = %my_namespace2
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %foo1.decl: %foo1.type = fn_decl @foo1 [concrete = constants.%foo1] {} {}
// CHECK:STDOUT: %my_namespace2: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .foo2 = %foo2.decl
// CHECK:STDOUT: .my_namespace3 = %my_namespace3
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %foo2.decl: %foo2.type = fn_decl @foo2 [concrete = constants.%foo2] {} {}
// CHECK:STDOUT: %my_namespace3: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .foo3 = %foo3.decl
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %foo3.decl: %foo3.type = fn_decl @foo3 [concrete = constants.%foo3] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @MyF() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %Cpp.ref.loc8: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %my_namespace1.ref.loc8: <namespace> = name_ref my_namespace1, imports.%my_namespace1 [concrete = imports.%my_namespace1]
// CHECK:STDOUT: %foo1.ref: %foo1.type = name_ref foo1, imports.%foo1.decl [concrete = constants.%foo1]
// CHECK:STDOUT: %foo1.call: init %empty_tuple.type = call %foo1.ref()
// CHECK:STDOUT: %Cpp.ref.loc9: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %my_namespace1.ref.loc9: <namespace> = name_ref my_namespace1, imports.%my_namespace1 [concrete = imports.%my_namespace1]
// CHECK:STDOUT: %my_namespace2.ref.loc9: <namespace> = name_ref my_namespace2, imports.%my_namespace2 [concrete = imports.%my_namespace2]
// CHECK:STDOUT: %foo2.ref: %foo2.type = name_ref foo2, imports.%foo2.decl [concrete = constants.%foo2]
// CHECK:STDOUT: %foo2.call: init %empty_tuple.type = call %foo2.ref()
// CHECK:STDOUT: %Cpp.ref.loc10: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %my_namespace1.ref.loc10: <namespace> = name_ref my_namespace1, imports.%my_namespace1 [concrete = imports.%my_namespace1]
// CHECK:STDOUT: %my_namespace2.ref.loc10: <namespace> = name_ref my_namespace2, imports.%my_namespace2 [concrete = imports.%my_namespace2]
// CHECK:STDOUT: %my_namespace3.ref: <namespace> = name_ref my_namespace3, imports.%my_namespace3 [concrete = imports.%my_namespace3]
// CHECK:STDOUT: %foo3.ref: %foo3.type = name_ref foo3, imports.%foo3.decl [concrete = constants.%foo3]
// CHECK:STDOUT: %foo3.call: init %empty_tuple.type = call %foo3.ref()
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- import_inline.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %foo.type: type = fn_type @foo [concrete]
// CHECK:STDOUT: %foo: %foo.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .N = %N
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %N: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .foo = %foo.decl
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %foo.decl: %foo.type = fn_decl @foo [concrete = constants.%foo] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @MyF() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %N.ref: <namespace> = name_ref N, imports.%N [concrete = imports.%N]
// CHECK:STDOUT: %foo.ref: %foo.type = name_ref foo, imports.%foo.decl [concrete = constants.%foo]
// CHECK:STDOUT: %foo.call: init %empty_tuple.type = call %foo.ref()
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- import_inline_ambiguity_not_triggered.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %X: type = class_type @X [concrete]
// CHECK:STDOUT: %foo.type: type = fn_type @foo [concrete]
// CHECK:STDOUT: %foo: %foo.type = struct_value () [concrete]
// CHECK:STDOUT: %T.as.Destroy.impl.Op.type.0e5: type = fn_type @T.as.Destroy.impl.Op, @T.as.Destroy.impl(%X) [concrete]
// CHECK:STDOUT: %T.as.Destroy.impl.Op.cbf: %T.as.Destroy.impl.Op.type.0e5 = struct_value () [concrete]
// CHECK:STDOUT: %ptr.13d: type = ptr_type %X [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .foo = %foo.decl
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %foo.decl: %foo.type = fn_decl @foo [concrete = constants.%foo] {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: } {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @MyF() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %foo.ref: %foo.type = name_ref foo, imports.%foo.decl [concrete = constants.%foo]
// CHECK:STDOUT: %.loc8_11.1: ref %X = temporary_storage
// CHECK:STDOUT: %foo.call: init %X = call %foo.ref() to %.loc8_11.1
// CHECK:STDOUT: %.loc8_11.2: ref %X = temporary %.loc8_11.1, %foo.call
// CHECK:STDOUT: %T.as.Destroy.impl.Op.bound: <bound method> = bound_method %.loc8_11.1, constants.%T.as.Destroy.impl.Op.cbf
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %bound_method: <bound method> = bound_method %.loc8_11.1, %T.as.Destroy.impl.Op.specific_fn
// CHECK:STDOUT: %addr: %ptr.13d = addr_of %.loc8_11.1
// CHECK:STDOUT: %T.as.Destroy.impl.Op.call: init %empty_tuple.type = call %bound_method(%addr)
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- import_special_name_call_escpaed.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %foo.type: type = fn_type @foo [concrete]
// CHECK:STDOUT: %foo: %foo.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .r#base = %base
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %base: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .foo = %foo.decl
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %foo.decl: %foo.type = fn_decl @foo [concrete = constants.%foo] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @MyF() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %base.ref: <namespace> = name_ref r#base, imports.%base [concrete = imports.%base]
// CHECK:STDOUT: %foo.ref: %foo.type = name_ref foo, imports.%foo.decl [concrete = constants.%foo]
// CHECK:STDOUT: %foo.call: init %empty_tuple.type = call %foo.ref()
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
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