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carbon-lang/toolchain/check/testdata/interop/cpp/namespace.carbon
T
Richard Smith 25681901bd Improve mapping of Clang diagnostics into Carbon diagnostics (#5894) 
Instead of taking the complete text of the Clang diagnostic and using it
as the message portion of a Carbon diagnostic, generate the individual
pieces separately and pass them into the Carbon diagnostic
infrastructure.

* Clang's context lines are generated by running a custom "diagnostic
renderer" and tracking which lines it wants to print as context for a
given source location. When mapping from a C++ source location back to a
Carbon location, the Carbon `Loc` structure is now fully populated,
including filling in the context line and the column number.
* Clang's snippet is generated by running a custom diagnostic renderer
that is a cut-down version of the full text diagnostic renderer that
only prints a snippet. This is then attached to the Carbon diagnostic
manually as an override for the snippet we'd usually create.

We no longer repeat the file location twice on each diagnostic, and no
longer produce a bogus "in import" line for all locations coming from
clang that point arbitrarily to the first C++ import in the Carbon file.
The `[diagnostic kind]` marker is now displayed at the end of the
diagnostic message, not on a line of its own after the snippet.
2025-08-01 01:24:31 +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() {
// Artificially create an error message here so that the first error line for
// this file (which otherwise has no source location) is associated with this
// file split.
// TODO: Pass a location into Clang when performing C++ name lookup so that
// its error has a location attached.
// CHECK:STDERR: fail_import_inline_ambiguity.carbon:[[@LINE+13]]:3: error: name `error` not found [NameNotFound]
// CHECK:STDERR: error;
// CHECK:STDERR: ^~~~~
// CHECK:STDERR:
// CHECK:STDERR: error: reference to 'N' is ambiguous [CppInteropParseError]
// CHECK:STDERR: fail_import_inline_ambiguity.carbon:[[@LINE-13]]:10: in file included here [InCppInclude]
// CHECK:STDERR: ./inline_ambiguity.h:2:11: note: candidate found by name lookup is 'N' [CppInteropParseNote]
// CHECK:STDERR: 2 | namespace N { void foo(); }
// CHECK:STDERR: | ^
// CHECK:STDERR: fail_import_inline_ambiguity.carbon:[[@LINE-17]]:10: in file included here [InCppInclude]
// CHECK:STDERR: ./inline_ambiguity.h:3:30: note: candidate found by name lookup is '(anonymous namespace)::N' [CppInteropParseNote]
// CHECK:STDERR: 3 | inline namespace { namespace N {} }
// CHECK:STDERR: | ^
error;
// 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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