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carbon-lang/toolchain/check/testdata/interop/cpp/import.carbon
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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/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/import.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interop/cpp/import.carbon
// ============================================================================
// Import C++ namespace indirectly
// ============================================================================
// --- namespace.h
namespace MyNamespace {
class MyClass {};
} // namespace MyNamespace
// --- namespace_api.carbon
library "[[@TEST_NAME]]";
import Cpp library "namespace.h";
alias MyNamespaceAlias = Cpp.MyNamespace;
// --- fail_import_namespace_api.carbon
library "[[@TEST_NAME]]";
import library "namespace_api";
fn F() {
// Imports are not implicitly re-exported, so lookup is expected to fail.
// CHECK:STDERR: fail_import_namespace_api.carbon:[[@LINE+4]]:10: error: member name `MyClass` not found in `Cpp.MyNamespace` [MemberNameNotFoundInInstScope]
// CHECK:STDERR: var x: MyNamespaceAlias.MyClass;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
var x: MyNamespaceAlias.MyClass;
}
// ============================================================================
// Import C++ struct indirectly
// ============================================================================
// --- struct.h
struct MyStruct { void Foo(); };
// --- struct_api.carbon
library "[[@TEST_NAME]]";
import Cpp library "struct.h";
alias MyStructAlias = Cpp.MyStruct;
// --- fail_todo_import_struct_api.carbon
// CHECK:STDERR: fail_todo_import_struct_api.carbon: error: semantics TODO: `Unsupported: Importing C++ indirectly` [SemanticsTodo]
// CHECK:STDERR:
library "[[@TEST_NAME]]";
import library "struct_api";
fn F() {
//@dump-sem-ir-begin
var x: MyStructAlias;
x.Foo();
//@dump-sem-ir-end
}
// ============================================================================
// Import C++ function indirectly
// ============================================================================
// --- function.h
auto foo_short(short x) -> void;
auto foo_int(int x) -> void;
// --- function_api.carbon
library "[[@TEST_NAME]]";
import Cpp library "function.h";
alias FooShort = Cpp.foo_short;
alias FooInt = Cpp.foo_int;
// --- fail_todo_import_function_api.carbon
// CHECK:STDERR: fail_todo_import_function_api.carbon: error: semantics TODO: `Unsupported: Importing C++ function `foo_short` indirectly` [SemanticsTodo]
// CHECK:STDERR:
// CHECK:STDERR: fail_todo_import_function_api.carbon: error: semantics TODO: `Unsupported: Importing C++ function `foo_short` indirectly` [SemanticsTodo]
// CHECK:STDERR:
// CHECK:STDERR: fail_todo_import_function_api.carbon: error: semantics TODO: `Unsupported: Importing C++ function `foo_int` indirectly` [SemanticsTodo]
// CHECK:STDERR:
// CHECK:STDERR: fail_todo_import_function_api.carbon: error: semantics TODO: `Unsupported: Importing C++ function `foo_int` indirectly` [SemanticsTodo]
// CHECK:STDERR:
library "[[@TEST_NAME]]";
import library "function_api";
fn F() {
//@dump-sem-ir-begin
FooShort(8 as i16);
FooInt(9);
//@dump-sem-ir-end
}
// CHECK:STDOUT: --- fail_todo_import_struct_api.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Main.MyStructAlias: type = import_ref Main//struct_api, MyStructAlias, loaded [concrete = <error>]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %x.patt: <error> = ref_binding_pattern x [concrete]
// CHECK:STDOUT: %x.var_patt: <error> = var_pattern %x.patt [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %x.var: ref <error> = var %x.var_patt [concrete = <error>]
// CHECK:STDOUT: %MyStructAlias.ref: type = name_ref MyStructAlias, imports.%Main.MyStructAlias [concrete = <error>]
// CHECK:STDOUT: %x: ref <error> = ref_binding x, <error> [concrete = <error>]
// CHECK:STDOUT: %x.ref: ref <error> = name_ref x, %x [concrete = <error>]
// CHECK:STDOUT: %Foo.ref: <error> = name_ref Foo, <error> [concrete = <error>]
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_todo_import_function_api.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %int_8.b85: Core.IntLiteral = int_value 8 [concrete]
// CHECK:STDOUT: %int_16: Core.IntLiteral = int_value 16 [concrete]
// CHECK:STDOUT: %i16: type = class_type @Int, @Int(%int_16) [concrete]
// CHECK:STDOUT: %As.type.771: type = facet_type <@As, @As(%i16)> [concrete]
// CHECK:STDOUT: %As.Convert.type.be5: type = fn_type @As.Convert, @As(%i16) [concrete]
// CHECK:STDOUT: %To: Core.IntLiteral = bind_symbolic_name To, 0 [symbolic]
// CHECK:STDOUT: %Core.IntLiteral.as.As.impl.Convert.type.565: type = fn_type @Core.IntLiteral.as.As.impl.Convert, @Core.IntLiteral.as.As.impl(%To) [symbolic]
// CHECK:STDOUT: %Core.IntLiteral.as.As.impl.Convert.d2c: %Core.IntLiteral.as.As.impl.Convert.type.565 = struct_value () [symbolic]
// CHECK:STDOUT: %As.impl_witness.2d2: <witness> = impl_witness imports.%As.impl_witness_table.5ad, @Core.IntLiteral.as.As.impl(%int_16) [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.As.impl.Convert.type.38a: type = fn_type @Core.IntLiteral.as.As.impl.Convert, @Core.IntLiteral.as.As.impl(%int_16) [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.As.impl.Convert.97a: %Core.IntLiteral.as.As.impl.Convert.type.38a = struct_value () [concrete]
// CHECK:STDOUT: %As.facet: %As.type.771 = facet_value Core.IntLiteral, (%As.impl_witness.2d2) [concrete]
// CHECK:STDOUT: %.026: type = fn_type_with_self_type %As.Convert.type.be5, %As.facet [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.As.impl.Convert.bound: <bound method> = bound_method %int_8.b85, %Core.IntLiteral.as.As.impl.Convert.97a [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.As.impl.Convert.specific_fn: <specific function> = specific_function %Core.IntLiteral.as.As.impl.Convert.97a, @Core.IntLiteral.as.As.impl.Convert(%int_16) [concrete]
// CHECK:STDOUT: %bound_method: <bound method> = bound_method %int_8.b85, %Core.IntLiteral.as.As.impl.Convert.specific_fn [concrete]
// CHECK:STDOUT: %int_8.823: %i16 = int_value 8 [concrete]
// CHECK:STDOUT: %int_9: Core.IntLiteral = int_value 9 [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Main.FooShort: <error> = import_ref Main//function_api, FooShort, loaded [concrete = <error>]
// CHECK:STDOUT: %Main.FooInt: <error> = import_ref Main//function_api, FooInt, loaded [concrete = <error>]
// CHECK:STDOUT: %Core.import_ref.99c: @Core.IntLiteral.as.As.impl.%Core.IntLiteral.as.As.impl.Convert.type (%Core.IntLiteral.as.As.impl.Convert.type.565) = import_ref Core//prelude/parts/int, loc{{\d+_\d+}}, loaded [symbolic = @Core.IntLiteral.as.As.impl.%Core.IntLiteral.as.As.impl.Convert (constants.%Core.IntLiteral.as.As.impl.Convert.d2c)]
// CHECK:STDOUT: %As.impl_witness_table.5ad = impl_witness_table (%Core.import_ref.99c), @Core.IntLiteral.as.As.impl [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %FooShort.ref: <error> = name_ref FooShort, imports.%Main.FooShort [concrete = <error>]
// CHECK:STDOUT: %int_8: Core.IntLiteral = int_value 8 [concrete = constants.%int_8.b85]
// CHECK:STDOUT: %int_16: Core.IntLiteral = int_value 16 [concrete = constants.%int_16]
// CHECK:STDOUT: %i16: type = class_type @Int, @Int(constants.%int_16) [concrete = constants.%i16]
// CHECK:STDOUT: %impl.elem0: %.026 = impl_witness_access constants.%As.impl_witness.2d2, element0 [concrete = constants.%Core.IntLiteral.as.As.impl.Convert.97a]
// CHECK:STDOUT: %bound_method.loc16_14.1: <bound method> = bound_method %int_8, %impl.elem0 [concrete = constants.%Core.IntLiteral.as.As.impl.Convert.bound]
// CHECK:STDOUT: %specific_fn: <specific function> = specific_function %impl.elem0, @Core.IntLiteral.as.As.impl.Convert(constants.%int_16) [concrete = constants.%Core.IntLiteral.as.As.impl.Convert.specific_fn]
// CHECK:STDOUT: %bound_method.loc16_14.2: <bound method> = bound_method %int_8, %specific_fn [concrete = constants.%bound_method]
// CHECK:STDOUT: %Core.IntLiteral.as.As.impl.Convert.call: init %i16 = call %bound_method.loc16_14.2(%int_8) [concrete = constants.%int_8.823]
// CHECK:STDOUT: %.loc16_14.1: %i16 = value_of_initializer %Core.IntLiteral.as.As.impl.Convert.call [concrete = constants.%int_8.823]
// CHECK:STDOUT: %.loc16_14.2: %i16 = converted %int_8, %.loc16_14.1 [concrete = constants.%int_8.823]
// CHECK:STDOUT: %FooInt.ref: <error> = name_ref FooInt, imports.%Main.FooInt [concrete = <error>]
// CHECK:STDOUT: %int_9: Core.IntLiteral = int_value 9 [concrete = constants.%int_9]
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
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