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carbon-lang/toolchain/check/testdata/interop/cpp/enum/convert.carbon
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Richard Smith 82ba1a43a1 Support for importing C++ enum types. (#5978) 
We import C++ enum types as Carbon class types as adapters for the
corresponding builtin integer type, and we import enumerator constants
as integer constants of that class type.

No operators are supported on such values for now; eventually once we
start asking Clang to implement operators on C++-owned types, these
types should be handled in the same way. However, they can be converted
to the corresponding integer type with `as` via adapter conversion, and
integer builtin functions can operate on them.
2025-08-26 23:11:35 +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/enum/convert.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interop/cpp/enum/convert.carbon
// --- enum.h
enum Enum : short { a, b, c };
enum Other : short {};
enum DifferentSize : long {};
// --- convert_enum.carbon
library "[[@TEST_NAME]]";
import Cpp library "enum.h";
//@dump-sem-ir-begin
fn F() {
let a: i16 = Cpp.Enum.a as i16;
let b: Cpp.Enum = (42 as i16) as Cpp.Enum;
let c: Cpp.Other = Cpp.a as Cpp.Other;
}
//@dump-sem-ir-end
// --- fail_wrong_type.carbon
library "[[@TEST_NAME]]";
import Cpp library "enum.h";
fn F() {
// CHECK:STDERR: fail_wrong_type.carbon:[[@LINE+7]]:3: error: cannot convert expression of type `Cpp.Enum` to `i8` with `as` [ConversionFailure]
// CHECK:STDERR: Cpp.Enum.a as i8;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~
// CHECK:STDERR: fail_wrong_type.carbon:[[@LINE+4]]:3: note: type `Cpp.Enum` does not implement interface `Core.As(i8)` [MissingImplInMemberAccessNote]
// CHECK:STDERR: Cpp.Enum.a as i8;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~
// CHECK:STDERR:
Cpp.Enum.a as i8;
// CHECK:STDERR: fail_wrong_type.carbon:[[@LINE+7]]:3: error: cannot convert expression of type `Cpp.Enum` to `i32` with `as` [ConversionFailure]
// CHECK:STDERR: Cpp.Enum.a as i32;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~
// CHECK:STDERR: fail_wrong_type.carbon:[[@LINE+4]]:3: note: type `Cpp.Enum` does not implement interface `Core.As(i32)` [MissingImplInMemberAccessNote]
// CHECK:STDERR: Cpp.Enum.a as i32;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~
// CHECK:STDERR:
Cpp.Enum.a as i32;
// CHECK:STDERR: fail_wrong_type.carbon:[[@LINE+7]]:3: error: cannot convert expression of type `i8` to `Cpp.Enum` with `as` [ConversionFailure]
// CHECK:STDERR: (42 as i8) as Cpp.Enum;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR: fail_wrong_type.carbon:[[@LINE+4]]:3: note: type `i8` does not implement interface `Core.As(Cpp.Enum)` [MissingImplInMemberAccessNote]
// CHECK:STDERR: (42 as i8) as Cpp.Enum;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
(42 as i8) as Cpp.Enum;
// CHECK:STDERR: fail_wrong_type.carbon:[[@LINE+7]]:3: error: cannot convert expression of type `i32` to `Cpp.Enum` with `as` [ConversionFailure]
// CHECK:STDERR: (42 as i32) as Cpp.Enum;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR: fail_wrong_type.carbon:[[@LINE+4]]:3: note: type `i32` does not implement interface `Core.As(Cpp.Enum)` [MissingImplInMemberAccessNote]
// CHECK:STDERR: (42 as i32) as Cpp.Enum;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
(42 as i32) as Cpp.Enum;
// CHECK:STDERR: fail_wrong_type.carbon:[[@LINE+7]]:3: error: cannot convert expression of type `Cpp.Enum` to `Cpp.DifferentSize` with `as` [ConversionFailure]
// CHECK:STDERR: Cpp.a as Cpp.DifferentSize;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR: fail_wrong_type.carbon:[[@LINE+4]]:3: note: type `Cpp.Enum` does not implement interface `Core.As(Cpp.DifferentSize)` [MissingImplInMemberAccessNote]
// CHECK:STDERR: Cpp.a as Cpp.DifferentSize;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
Cpp.a as Cpp.DifferentSize;
}
// CHECK:STDOUT: --- convert_enum.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
// CHECK:STDOUT: %int_16: Core.IntLiteral = int_value 16 [concrete]
// CHECK:STDOUT: %i16: type = class_type @Int, @Int(%int_16) [concrete]
// CHECK:STDOUT: %pattern_type.2f8: type = pattern_type %i16 [concrete]
// CHECK:STDOUT: %Enum: type = class_type @Enum [concrete]
// CHECK:STDOUT: %int_0.420: %Enum = int_value 0 [concrete]
// CHECK:STDOUT: %int_0.320: %i16 = int_value 0 [concrete]
// CHECK:STDOUT: %pattern_type.ebf: type = pattern_type %Enum [concrete]
// CHECK:STDOUT: %int_42.20e: Core.IntLiteral = int_value 42 [concrete]
// CHECK:STDOUT: %As.type.a96: 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.062: type = fn_type @Core.IntLiteral.as.As.impl.Convert, @Core.IntLiteral.as.As.impl(%To) [symbolic]
// CHECK:STDOUT: %Core.IntLiteral.as.As.impl.Convert.527: %Core.IntLiteral.as.As.impl.Convert.type.062 = struct_value () [symbolic]
// CHECK:STDOUT: %As.impl_witness.0ef: <witness> = impl_witness imports.%As.impl_witness_table.eb4, @Core.IntLiteral.as.As.impl(%int_16) [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.As.impl.Convert.type.172: 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.489: %Core.IntLiteral.as.As.impl.Convert.type.172 = struct_value () [concrete]
// CHECK:STDOUT: %As.facet: %As.type.a96 = facet_value Core.IntLiteral, (%As.impl_witness.0ef) [concrete]
// CHECK:STDOUT: %.91d: 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_42.20e, %Core.IntLiteral.as.As.impl.Convert.489 [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.As.impl.Convert.specific_fn: <specific function> = specific_function %Core.IntLiteral.as.As.impl.Convert.489, @Core.IntLiteral.as.As.impl.Convert(%int_16) [concrete]
// CHECK:STDOUT: %bound_method: <bound method> = bound_method %int_42.20e, %Core.IntLiteral.as.As.impl.Convert.specific_fn [concrete]
// CHECK:STDOUT: %int_42.a0e: %i16 = int_value 42 [concrete]
// CHECK:STDOUT: %int_42.c3a: %Enum = int_value 42 [concrete]
// CHECK:STDOUT: %Other: type = class_type @Other [concrete]
// CHECK:STDOUT: %pattern_type.c06: type = pattern_type %Other [concrete]
// CHECK:STDOUT: %int_0.fa2: %Other = int_value 0 [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .Enum = %Enum.decl
// CHECK:STDOUT: .Other = %Other.decl
// CHECK:STDOUT: .a = %int_0
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Enum.decl: type = class_decl @Enum [concrete = constants.%Enum] {} {}
// CHECK:STDOUT: %int_0: %Enum = int_value 0 [concrete = constants.%int_0.420]
// CHECK:STDOUT: %Core.import_ref.78a: @Core.IntLiteral.as.As.impl.%Core.IntLiteral.as.As.impl.Convert.type (%Core.IntLiteral.as.As.impl.Convert.type.062) = import_ref Core//prelude/parts/int, loc25_39, loaded [symbolic = @Core.IntLiteral.as.As.impl.%Core.IntLiteral.as.As.impl.Convert (constants.%Core.IntLiteral.as.As.impl.Convert.527)]
// CHECK:STDOUT: %As.impl_witness_table.eb4 = impl_witness_table (%Core.import_ref.78a), @Core.IntLiteral.as.As.impl [concrete]
// CHECK:STDOUT: %Other.decl: type = class_decl @Other [concrete = constants.%Other] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %a.patt: %pattern_type.2f8 = binding_pattern a [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %Cpp.ref.loc8: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Enum.ref.loc8: type = name_ref Enum, imports.%Enum.decl [concrete = constants.%Enum]
// CHECK:STDOUT: %a.ref.loc8: %Enum = name_ref a, imports.%int_0 [concrete = constants.%int_0.420]
// CHECK:STDOUT: %int_16.loc8_30: Core.IntLiteral = int_value 16 [concrete = constants.%int_16]
// CHECK:STDOUT: %i16.loc8_30: type = class_type @Int, @Int(constants.%int_16) [concrete = constants.%i16]
// CHECK:STDOUT: %.loc8_27.1: %i16 = as_compatible %a.ref.loc8 [concrete = constants.%int_0.320]
// CHECK:STDOUT: %.loc8_27.2: %i16 = converted %a.ref.loc8, %.loc8_27.1 [concrete = constants.%int_0.320]
// CHECK:STDOUT: %.loc8_10: type = splice_block %i16.loc8_10 [concrete = constants.%i16] {
// CHECK:STDOUT: %int_16.loc8_10: Core.IntLiteral = int_value 16 [concrete = constants.%int_16]
// CHECK:STDOUT: %i16.loc8_10: type = class_type @Int, @Int(constants.%int_16) [concrete = constants.%i16]
// CHECK:STDOUT: }
// CHECK:STDOUT: %a: %i16 = bind_name a, %.loc8_27.2
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %b.patt: %pattern_type.ebf = binding_pattern b [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %int_42: Core.IntLiteral = int_value 42 [concrete = constants.%int_42.20e]
// CHECK:STDOUT: %int_16.loc9: Core.IntLiteral = int_value 16 [concrete = constants.%int_16]
// CHECK:STDOUT: %i16.loc9: type = class_type @Int, @Int(constants.%int_16) [concrete = constants.%i16]
// CHECK:STDOUT: %impl.elem0: %.91d = impl_witness_access constants.%As.impl_witness.0ef, element0 [concrete = constants.%Core.IntLiteral.as.As.impl.Convert.489]
// CHECK:STDOUT: %bound_method.loc9_25.1: <bound method> = bound_method %int_42, %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.loc9_25.2: <bound method> = bound_method %int_42, %specific_fn [concrete = constants.%bound_method]
// CHECK:STDOUT: %Core.IntLiteral.as.As.impl.Convert.call: init %i16 = call %bound_method.loc9_25.2(%int_42) [concrete = constants.%int_42.a0e]
// CHECK:STDOUT: %.loc9_25.1: %i16 = value_of_initializer %Core.IntLiteral.as.As.impl.Convert.call [concrete = constants.%int_42.a0e]
// CHECK:STDOUT: %.loc9_25.2: %i16 = converted %int_42, %.loc9_25.1 [concrete = constants.%int_42.a0e]
// CHECK:STDOUT: %Cpp.ref.loc9_36: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Enum.ref.loc9_39: type = name_ref Enum, imports.%Enum.decl [concrete = constants.%Enum]
// CHECK:STDOUT: %.loc9_33.1: %Enum = as_compatible %.loc9_25.2 [concrete = constants.%int_42.c3a]
// CHECK:STDOUT: %.loc9_33.2: %Enum = converted %.loc9_25.2, %.loc9_33.1 [concrete = constants.%int_42.c3a]
// CHECK:STDOUT: %.loc9_13: type = splice_block %Enum.ref.loc9_13 [concrete = constants.%Enum] {
// CHECK:STDOUT: %Cpp.ref.loc9_10: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Enum.ref.loc9_13: type = name_ref Enum, imports.%Enum.decl [concrete = constants.%Enum]
// CHECK:STDOUT: }
// CHECK:STDOUT: %b: %Enum = bind_name b, %.loc9_33.2
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %c.patt: %pattern_type.c06 = binding_pattern c [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %Cpp.ref.loc10_22: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %a.ref.loc10: %Enum = name_ref a, imports.%int_0 [concrete = constants.%int_0.420]
// CHECK:STDOUT: %Cpp.ref.loc10_31: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Other.ref.loc10_34: type = name_ref Other, imports.%Other.decl [concrete = constants.%Other]
// CHECK:STDOUT: %.loc10_28.1: %Other = as_compatible %a.ref.loc10 [concrete = constants.%int_0.fa2]
// CHECK:STDOUT: %.loc10_28.2: %Other = converted %a.ref.loc10, %.loc10_28.1 [concrete = constants.%int_0.fa2]
// CHECK:STDOUT: %.loc10_13: type = splice_block %Other.ref.loc10_13 [concrete = constants.%Other] {
// CHECK:STDOUT: %Cpp.ref.loc10_10: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Other.ref.loc10_13: type = name_ref Other, imports.%Other.decl [concrete = constants.%Other]
// CHECK:STDOUT: }
// CHECK:STDOUT: %c: %Other = bind_name c, %.loc10_28.2
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
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