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carbon-lang/toolchain/check/testdata/interop/cpp/namespace.carbon
T
Richard SmithBoaz BricknerJon Ross-Perkins
 14f51d70c2 Emit diagnostics produced by Clang after the ASTUnit is constructed. (#5876) 
Previously we would drop these diagnostics; now periodically flush them
to Carbon's diagnostics emitter. We flush them at the end of checking,
and also immediately before changing the set of diagnostic annotation
scopes, so that Clang diagnostics get properly annotated.

This exposes some double diagnostics being produced in situations where
Clang's name lookup logic would produce a diagnostic and we also
produced one. For access control issues, use the Carbon diagnostic, in
order to properly handle protected access. For ambiguity issues, use the
Clang diagnostic that produces helpful notes.

Also fix rendering of note diagnostics produced by Clang, by attaching
them to the prior error / warning diagnostic.

---------

Co-authored-by: Boaz Brickner <brickner@google.com>
Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
2025-07-30 21:01:12 +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]]";
// CHECK:STDERR: fail_import_inline_ambiguity.carbon:[[@LINE+13]]:1: in import [InImport]
// CHECK:STDERR: error: error: reference to 'N' is ambiguous
// CHECK:STDERR: [CppInteropParseError]
// CHECK:STDERR: fail_import_inline_ambiguity.carbon:[[@LINE+10]]:1: in import [InImport]
// CHECK:STDERR: ./inline_ambiguity.h:2: note: ./inline_ambiguity.h:2:11: note: candidate found by name lookup is 'N'
// CHECK:STDERR: 2 | namespace N { void foo(); }
// CHECK:STDERR: | ^
// CHECK:STDERR: [CppInteropParseNote]
// CHECK:STDERR: fail_import_inline_ambiguity.carbon:[[@LINE+5]]:1: in import [InImport]
// CHECK:STDERR: ./inline_ambiguity.h:3: note: ./inline_ambiguity.h:3:30: note: candidate found by name lookup is '(anonymous namespace)::N'
// CHECK:STDERR: 3 | inline namespace { namespace N {} }
// CHECK:STDERR: | ^
// CHECK:STDERR: [CppInteropParseNote]
import Cpp library "inline_ambiguity.h";
fn MyF() {
// 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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