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carbon-lang/toolchain/check/testdata/interop/cpp/class/union.carbon
T
Geoff Romer 09710d102f Separate binding insts for refs and values (#6235)
This resolves a TODO in `expr_info.cpp` by using the inst kind rather
than the bound value to track the binding's category.

Since we're churning all the `bind_name` insts in testdata anyway, I'm
also taking this opportunity to align the inst naming with the design's
terminology, by calling these insts "bindings" (this aspect of the PR is
dependent on #6231 resolving an ambiguity in that terminology). For
consistency we'll need to rename several other insts as well (see the
TODO on `RefBinding`); I'm deferring that to a separate PR to minimize
the review load, but I think those name changes are in-scope for this
review.
2025-10-23 01:46:24 +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/convert.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/union.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interop/cpp/class/union.carbon
// ============================================================================
// Declaration
// ============================================================================
// --- declaration.h
union Bar;
// --- import_declaration.carbon
library "[[@TEST_NAME]]";
import Cpp library "declaration.h";
//@dump-sem-ir-begin
fn MyF(bar: Cpp.Bar*);
//@dump-sem-ir-end
// --- fail_use_declaration_as_definition.carbon
library "[[@TEST_NAME]]";
import Cpp library "declaration.h";
fn MyF() {
// CHECK:STDERR: fail_use_declaration_as_definition.carbon:[[@LINE+8]]:12: error: binding pattern has incomplete type `Bar` in name binding declaration [IncompleteTypeInBindingDecl]
// CHECK:STDERR: var bar: Cpp.Bar;
// CHECK:STDERR: ^~~~~~~
// CHECK:STDERR: fail_use_declaration_as_definition.carbon:[[@LINE-6]]:10: in file included here [InCppInclude]
// CHECK:STDERR: ./declaration.h:2:7: note: class was forward declared here [ClassForwardDeclaredHere]
// CHECK:STDERR: union Bar;
// CHECK:STDERR: ^
// CHECK:STDERR:
var bar: Cpp.Bar;
}
// ============================================================================
// Definition
// ============================================================================
// --- definition.h
union Bar {};
// --- import_definition.carbon
library "[[@TEST_NAME]]";
import Cpp library "definition.h";
//@dump-sem-ir-begin
fn MyF(bar: Cpp.Bar*);
//@dump-sem-ir-end
// ============================================================================
// Declaration and definition
// ============================================================================
// --- declaration_and_definition.h
union Bar;
union Bar {};
// --- import_declaration_and_definition.carbon
library "[[@TEST_NAME]]";
import Cpp library "declaration_and_definition.h";
//@dump-sem-ir-begin
fn MyF(bar: Cpp.Bar*);
//@dump-sem-ir-end
// ============================================================================
// Static member function
// ============================================================================
// --- static_member_function.h
union Bar {
public:
static auto foo() -> void;
};
// --- import_static_member_function.carbon
library "[[@TEST_NAME]]";
import Cpp library "static_member_function.h";
fn MyF() {
//@dump-sem-ir-begin
Cpp.Bar.foo();
//@dump-sem-ir-end
}
// ============================================================================
// Static data member
// ============================================================================
// --- static_data_member.h
union Bar {
public:
static Bar* _Nonnull foo;
};
// --- import_static_data_member.carbon
library "[[@TEST_NAME]]";
import Cpp library "static_data_member.h";
fn MyF() {
//@dump-sem-ir-begin
let bar: Cpp.Bar* = Cpp.Bar.foo;
//@dump-sem-ir-end
}
// ============================================================================
// Data member
// ============================================================================
// --- data_member.h
union Bar {
public:
Bar* _Nonnull foo;
};
// --- import_data_member.carbon
library "[[@TEST_NAME]]";
import Cpp library "data_member.h";
//@dump-sem-ir-begin
fn MyF(bar : Cpp.Bar*) {
let foo_bar: Cpp.Bar* = bar->foo;
}
//@dump-sem-ir-end
// ============================================================================
// Template
// ============================================================================
// --- template.h
template<typename T>
union Bar {};
// --- fail_todo_import_template.carbon
library "[[@TEST_NAME]]";
// CHECK:STDERR: fail_todo_import_template.carbon:[[@LINE+4]]:10: in file included here [InCppInclude]
// CHECK:STDERR: ./template.h:3:7: error: semantics TODO: `Unsupported: Declaration type ClassTemplate` [SemanticsTodo]
// CHECK:STDERR: union Bar {};
// CHECK:STDERR: ^
import Cpp library "template.h";
//@dump-sem-ir-begin
// CHECK:STDERR: fail_todo_import_template.carbon:[[@LINE+4]]:13: note: in `Cpp` name lookup for `Bar` [InCppNameLookup]
// CHECK:STDERR: fn MyF(bar: Cpp.Bar*);
// CHECK:STDERR: ^~~~~~~
// CHECK:STDERR:
fn MyF(bar: Cpp.Bar*);
//@dump-sem-ir-end
// CHECK:STDOUT: --- import_declaration.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Bar: type = class_type @Bar [concrete]
// CHECK:STDOUT: %ptr: type = ptr_type %Bar [concrete]
// CHECK:STDOUT: %pattern_type: type = pattern_type %ptr [concrete]
// CHECK:STDOUT: %MyF.type: type = fn_type @MyF [concrete]
// CHECK:STDOUT: %MyF: %MyF.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .Bar = %Bar.decl
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Bar.decl: type = class_decl @Bar [concrete = constants.%Bar] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %MyF.decl: %MyF.type = fn_decl @MyF [concrete = constants.%MyF] {
// CHECK:STDOUT: %bar.patt: %pattern_type = value_binding_pattern bar [concrete]
// CHECK:STDOUT: %bar.param_patt: %pattern_type = value_param_pattern %bar.patt, call_param0 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %bar.param: %ptr = value_param call_param0
// CHECK:STDOUT: %.loc7: type = splice_block %ptr [concrete = constants.%ptr] {
// CHECK:STDOUT: %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Bar.ref: type = name_ref Bar, imports.%Bar.decl [concrete = constants.%Bar]
// CHECK:STDOUT: %ptr: type = ptr_type %Bar.ref [concrete = constants.%ptr]
// CHECK:STDOUT: }
// CHECK:STDOUT: %bar: %ptr = value_binding bar, %bar.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @MyF(%bar.param: %ptr);
// CHECK:STDOUT:
// CHECK:STDOUT: --- import_definition.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Bar: type = class_type @Bar [concrete]
// CHECK:STDOUT: %ptr: type = ptr_type %Bar [concrete]
// CHECK:STDOUT: %pattern_type: type = pattern_type %ptr [concrete]
// CHECK:STDOUT: %MyF.type: type = fn_type @MyF [concrete]
// CHECK:STDOUT: %MyF: %MyF.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .Bar = %Bar.decl
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Bar.decl: type = class_decl @Bar [concrete = constants.%Bar] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %MyF.decl: %MyF.type = fn_decl @MyF [concrete = constants.%MyF] {
// CHECK:STDOUT: %bar.patt: %pattern_type = value_binding_pattern bar [concrete]
// CHECK:STDOUT: %bar.param_patt: %pattern_type = value_param_pattern %bar.patt, call_param0 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %bar.param: %ptr = value_param call_param0
// CHECK:STDOUT: %.loc7: type = splice_block %ptr [concrete = constants.%ptr] {
// CHECK:STDOUT: %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Bar.ref: type = name_ref Bar, imports.%Bar.decl [concrete = constants.%Bar]
// CHECK:STDOUT: %ptr: type = ptr_type %Bar.ref [concrete = constants.%ptr]
// CHECK:STDOUT: }
// CHECK:STDOUT: %bar: %ptr = value_binding bar, %bar.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @MyF(%bar.param: %ptr);
// CHECK:STDOUT:
// CHECK:STDOUT: --- import_declaration_and_definition.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Bar: type = class_type @Bar [concrete]
// CHECK:STDOUT: %ptr: type = ptr_type %Bar [concrete]
// CHECK:STDOUT: %pattern_type: type = pattern_type %ptr [concrete]
// CHECK:STDOUT: %MyF.type: type = fn_type @MyF [concrete]
// CHECK:STDOUT: %MyF: %MyF.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .Bar = %Bar.decl
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Bar.decl: type = class_decl @Bar [concrete = constants.%Bar] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %MyF.decl: %MyF.type = fn_decl @MyF [concrete = constants.%MyF] {
// CHECK:STDOUT: %bar.patt: %pattern_type = value_binding_pattern bar [concrete]
// CHECK:STDOUT: %bar.param_patt: %pattern_type = value_param_pattern %bar.patt, call_param0 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %bar.param: %ptr = value_param call_param0
// CHECK:STDOUT: %.loc7: type = splice_block %ptr [concrete = constants.%ptr] {
// CHECK:STDOUT: %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Bar.ref: type = name_ref Bar, imports.%Bar.decl [concrete = constants.%Bar]
// CHECK:STDOUT: %ptr: type = ptr_type %Bar.ref [concrete = constants.%ptr]
// CHECK:STDOUT: }
// CHECK:STDOUT: %bar: %ptr = value_binding bar, %bar.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @MyF(%bar.param: %ptr);
// CHECK:STDOUT:
// CHECK:STDOUT: --- import_static_member_function.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %Bar: type = class_type @Bar [concrete]
// CHECK:STDOUT: %Bar.foo.cpp_overload_set.type: type = cpp_overload_set_type @Bar.foo.cpp_overload_set [concrete]
// CHECK:STDOUT: %Bar.foo.cpp_overload_set.value: %Bar.foo.cpp_overload_set.type = cpp_overload_set_value @Bar.foo.cpp_overload_set [concrete]
// CHECK:STDOUT: %Bar.foo.type: type = fn_type @Bar.foo [concrete]
// CHECK:STDOUT: %Bar.foo: %Bar.foo.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .Bar = %Bar.decl
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Bar.decl: type = class_decl @Bar [concrete = constants.%Bar] {} {}
// CHECK:STDOUT: %Bar.foo.cpp_overload_set.value: %Bar.foo.cpp_overload_set.type = cpp_overload_set_value @Bar.foo.cpp_overload_set [concrete = constants.%Bar.foo.cpp_overload_set.value]
// CHECK:STDOUT: %Bar.foo.decl: %Bar.foo.type = fn_decl @Bar.foo [concrete = constants.%Bar.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: %Bar.ref: type = name_ref Bar, imports.%Bar.decl [concrete = constants.%Bar]
// CHECK:STDOUT: %foo.ref: %Bar.foo.cpp_overload_set.type = name_ref foo, imports.%Bar.foo.cpp_overload_set.value [concrete = constants.%Bar.foo.cpp_overload_set.value]
// CHECK:STDOUT: %Bar.foo.call: init %empty_tuple.type = call imports.%Bar.foo.decl()
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- import_static_data_member.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Bar: type = class_type @Bar [concrete]
// CHECK:STDOUT: %ptr.f68: type = ptr_type %Bar [concrete]
// CHECK:STDOUT: %pattern_type: type = pattern_type %ptr.f68 [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .Bar = %Bar.decl
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Bar.decl: type = class_decl @Bar [concrete = constants.%Bar] {} {}
// CHECK:STDOUT: %foo.var: ref %ptr.f68 = var %foo.var_patt
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @MyF() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %bar.patt: %pattern_type = value_binding_pattern bar [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %Cpp.ref.loc8_23: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Bar.ref.loc8_26: type = name_ref Bar, imports.%Bar.decl [concrete = constants.%Bar]
// CHECK:STDOUT: %foo.ref: ref %ptr.f68 = name_ref foo, imports.%foo.var
// CHECK:STDOUT: %.loc8_19: type = splice_block %ptr [concrete = constants.%ptr.f68] {
// CHECK:STDOUT: %Cpp.ref.loc8_12: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Bar.ref.loc8_15: type = name_ref Bar, imports.%Bar.decl [concrete = constants.%Bar]
// CHECK:STDOUT: %ptr: type = ptr_type %Bar.ref.loc8_15 [concrete = constants.%ptr.f68]
// CHECK:STDOUT: }
// CHECK:STDOUT: %.loc8_30: %ptr.f68 = bind_value %foo.ref
// CHECK:STDOUT: %bar: %ptr.f68 = value_binding bar, %.loc8_30
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- import_data_member.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Bar: type = class_type @Bar [concrete]
// CHECK:STDOUT: %ptr.f68: type = ptr_type %Bar [concrete]
// CHECK:STDOUT: %pattern_type: type = pattern_type %ptr.f68 [concrete]
// CHECK:STDOUT: %MyF.type: type = fn_type @MyF [concrete]
// CHECK:STDOUT: %MyF: %MyF.type = struct_value () [concrete]
// CHECK:STDOUT: %Bar.elem: type = unbound_element_type %Bar, %ptr.f68 [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .Bar = %Bar.decl
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Bar.decl: type = class_decl @Bar [concrete = constants.%Bar] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %MyF.decl: %MyF.type = fn_decl @MyF [concrete = constants.%MyF] {
// CHECK:STDOUT: %bar.patt: %pattern_type = value_binding_pattern bar [concrete]
// CHECK:STDOUT: %bar.param_patt: %pattern_type = value_param_pattern %bar.patt, call_param0 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %bar.param: %ptr.f68 = value_param call_param0
// CHECK:STDOUT: %.loc7: type = splice_block %ptr.loc7 [concrete = constants.%ptr.f68] {
// CHECK:STDOUT: %Cpp.ref.loc7: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Bar.ref.loc7: type = name_ref Bar, imports.%Bar.decl [concrete = constants.%Bar]
// CHECK:STDOUT: %ptr.loc7: type = ptr_type %Bar.ref.loc7 [concrete = constants.%ptr.f68]
// CHECK:STDOUT: }
// CHECK:STDOUT: %bar: %ptr.f68 = value_binding bar, %bar.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @MyF(%bar.param: %ptr.f68) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %foo_bar.patt: %pattern_type = value_binding_pattern foo_bar [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %bar.ref: %ptr.f68 = name_ref bar, %bar
// CHECK:STDOUT: %.loc8_30.1: ref %Bar = deref %bar.ref
// CHECK:STDOUT: %foo.ref: %Bar.elem = name_ref foo, @Bar.%.1 [concrete = @Bar.%.1]
// CHECK:STDOUT: %.loc8_30.2: ref %ptr.f68 = class_element_access %.loc8_30.1, element0
// CHECK:STDOUT: %.loc8_23: type = splice_block %ptr.loc8 [concrete = constants.%ptr.f68] {
// CHECK:STDOUT: %Cpp.ref.loc8: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Bar.ref.loc8: type = name_ref Bar, imports.%Bar.decl [concrete = constants.%Bar]
// CHECK:STDOUT: %ptr.loc8: type = ptr_type %Bar.ref.loc8 [concrete = constants.%ptr.f68]
// CHECK:STDOUT: }
// CHECK:STDOUT: %.loc8_30.3: %ptr.f68 = bind_value %.loc8_30.2
// CHECK:STDOUT: %foo_bar: %ptr.f68 = value_binding foo_bar, %.loc8_30.3
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_todo_import_template.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %MyF.type: type = fn_type @MyF [concrete]
// CHECK:STDOUT: %MyF: %MyF.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .Bar = <error>
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %MyF.decl: %MyF.type = fn_decl @MyF [concrete = constants.%MyF] {
// CHECK:STDOUT: %bar.patt: <error> = value_binding_pattern bar [concrete]
// CHECK:STDOUT: %bar.param_patt: <error> = value_param_pattern %bar.patt, call_param0 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %bar.param: <error> = value_param call_param0
// CHECK:STDOUT: %.loc15: type = splice_block %ptr [concrete = <error>] {
// CHECK:STDOUT: %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Bar.ref: <error> = name_ref Bar, <error> [concrete = <error>]
// CHECK:STDOUT: %ptr: type = ptr_type <error> [concrete = <error>]
// CHECK:STDOUT: }
// CHECK:STDOUT: %bar: <error> = value_binding bar, %bar.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @MyF(%bar.param: <error>);
// CHECK:STDOUT: