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carbon-lang/toolchain/check/testdata/interop/cpp/import.carbon
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Richard Smith f9ab963bd6 Add a type_literal instruction to represent syntactic type literals. (#6781) 
This allows us to capture the location at which a type literal was used,
even in the cases where we don't otherwise need to create a new
instruction to represent the type such as for `char` or `str`.

The logic used to build the underlying type is now marked as desugaring.
For cases such as `iN`, this causes the call to `Core.Int` to no longer
be added as a dedicated IR instruction, and instead its constant value
is used directly as the value of the `type_literal`. This results in
this being on balance a reduction in the size of the IR.

This also fixes a crash in C++ interop when using a `char` literal as a
template argument. The crash was caused by the template argument not
having an associated location when mapping to a C++ location. See
changes to check/testdata/interop/cpp/template/type_param.carbon for an
example that used to crash before this change.

Update alias handling to allow an alias to point at any type literal,
reinstating support for aliases for type literals such as `bool` and
`i32` that had previously worked but stopped working when we
transitioned those types to being defined in the prelude. See changes to
toolchain/check/testdata/alias/builtins.carbon.

All the test changes other than the two mentioned above are mechanical
autoupdate changes switching to the new instruction.
2026-02-26 20:10:50 +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]]:17: error: member name `MyClass` not found in `Cpp.MyNamespace` [MemberNameNotFoundInInstScope]
// CHECK:STDERR: var unused x: MyNamespaceAlias.MyClass;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
var unused 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
}
// ============================================================================
// Import Cpp without a header
// ============================================================================
// --- no_header.carbon
library "[[@TEST_NAME]]";
import Cpp;
fn F(input: Cpp.int) {
let unused output: i32 = input;
}
// ============================================================================
// Import Cpp without a header, with a header and inline
// ============================================================================
// --- header_function.h
auto MyHeaderFunction(int) -> void;
// --- no_header_with_header_inline.carbon
library "[[@TEST_NAME]]";
import Cpp;
import Cpp library "header_function.h";
import Cpp inline '''
auto MyInlineFunction(short) -> void;
''';
fn F() {
Cpp.MyHeaderFunction(8 as Cpp.int);
Cpp.MyInlineFunction(9 as Cpp.short);
}
// CHECK:STDOUT: --- fail_todo_import_struct_api.carbon
// 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.359: type = facet_type <@As, @As(%i16)> [concrete]
// CHECK:STDOUT: %To: Core.IntLiteral = symbolic_binding To, 0 [symbolic]
// CHECK:STDOUT: %Core.IntLiteral.as.As.impl.Convert.type.09e: type = fn_type @Core.IntLiteral.as.As.impl.Convert, @Core.IntLiteral.as.As.impl(%To) [symbolic]
// CHECK:STDOUT: %Core.IntLiteral.as.As.impl.Convert.dbe: %Core.IntLiteral.as.As.impl.Convert.type.09e = struct_value () [symbolic]
// CHECK:STDOUT: %As.impl_witness.b61: <witness> = impl_witness imports.%As.impl_witness_table.9fc, @Core.IntLiteral.as.As.impl(%int_16) [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.As.impl.Convert.type.c60: 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.a42: %Core.IntLiteral.as.As.impl.Convert.type.c60 = struct_value () [concrete]
// CHECK:STDOUT: %As.facet: %As.type.359 = facet_value Core.IntLiteral, (%As.impl_witness.b61) [concrete]
// CHECK:STDOUT: %As.WithSelf.Convert.type.2c0: type = fn_type @As.WithSelf.Convert, @As(%i16, %As.facet) [concrete]
// CHECK:STDOUT: %.70c: type = fn_type_with_self_type %As.WithSelf.Convert.type.2c0, %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.a42 [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.As.impl.Convert.specific_fn: <specific function> = specific_function %Core.IntLiteral.as.As.impl.Convert.a42, @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.ca0: @Core.IntLiteral.as.As.impl.%Core.IntLiteral.as.As.impl.Convert.type (%Core.IntLiteral.as.As.impl.Convert.type.09e) = 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.dbe)]
// CHECK:STDOUT: %As.impl_witness_table.9fc = impl_witness_table (%Core.import_ref.ca0), @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: %i16: type = type_literal constants.%i16 [concrete = constants.%i16]
// CHECK:STDOUT: %impl.elem0: %.70c = impl_witness_access constants.%As.impl_witness.b61, element0 [concrete = constants.%Core.IntLiteral.as.As.impl.Convert.a42]
// 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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