mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 22:02:23 +01:00
Richard Smith
82ba1a43a1
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.
93 lines
4.1 KiB
Plaintext
93 lines
4.1 KiB
Plaintext
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/convert.carbon
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// EXTRA-ARGS: --clang-arg=-fms-compatibility
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//
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// AUTOUPDATE
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// TIP: To test this file alone, run:
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// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/interop/cpp/enum/incomplete.carbon
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// TIP: To dump output, run:
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// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interop/cpp/enum/incomplete.carbon
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// --- declaration.h
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// This is not valid in standard C++, but MSVC allows it as an extension, and so
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// Clang allows it in MSVC compatibility mode.
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enum UnsizedEnum;
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// --- import_declaration.carbon
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library "[[@TEST_NAME]]";
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// CHECK:STDERR: import_declaration.carbon:[[@LINE+5]]:10: in file included here [InCppInclude]
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// CHECK:STDERR: ./declaration.h:4:6: warning: forward references to 'enum' types are a Microsoft extension [CppInteropParseWarning]
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// CHECK:STDERR: 4 | enum UnsizedEnum;
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// CHECK:STDERR: | ^
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// CHECK:STDERR:
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import Cpp library "declaration.h";
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//@dump-sem-ir-begin
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fn F(e: Cpp.UnsizedEnum);
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//@dump-sem-ir-end
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// --- fail_use_declaration_as_definition.carbon
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library "[[@TEST_NAME]]";
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// CHECK:STDERR: fail_use_declaration_as_definition.carbon:[[@LINE+5]]:10: in file included here [InCppInclude]
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// CHECK:STDERR: ./declaration.h:4:6: warning: forward references to 'enum' types are a Microsoft extension [CppInteropParseWarning]
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// CHECK:STDERR: 4 | enum UnsizedEnum;
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// CHECK:STDERR: | ^
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// CHECK:STDERR:
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import Cpp library "declaration.h";
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fn MyF() {
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// TODO: It's a bit surprising to refer to this type as a class, even though
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// we model it as a class in Carbon. Consider customizing the diagnostic.
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// CHECK:STDERR: fail_use_declaration_as_definition.carbon:[[@LINE+8]]:10: error: binding pattern has incomplete type `UnsizedEnum` in name binding declaration [IncompleteTypeInBindingDecl]
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// CHECK:STDERR: var e: Cpp.UnsizedEnum;
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// CHECK:STDERR: ^~~~~~~~~~~~~~~
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// CHECK:STDERR: fail_use_declaration_as_definition.carbon:[[@LINE-8]]:10: in file included here [InCppInclude]
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// CHECK:STDERR: ./declaration.h:4:6: note: class was forward declared here [ClassForwardDeclaredHere]
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// CHECK:STDERR: enum UnsizedEnum;
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// CHECK:STDERR: ^
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// CHECK:STDERR:
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var e: Cpp.UnsizedEnum;
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}
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// CHECK:STDOUT: --- import_declaration.carbon
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// CHECK:STDOUT:
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// CHECK:STDOUT: constants {
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// CHECK:STDOUT: %UnsizedEnum: type = class_type @UnsizedEnum [concrete]
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// CHECK:STDOUT: %pattern_type: type = pattern_type %UnsizedEnum [concrete]
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// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
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// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: imports {
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// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
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// CHECK:STDOUT: .UnsizedEnum = %UnsizedEnum.decl
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// CHECK:STDOUT: import Cpp//...
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// CHECK:STDOUT: }
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// CHECK:STDOUT: %UnsizedEnum.decl: type = class_decl @UnsizedEnum [concrete = constants.%UnsizedEnum] {} {}
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: file {
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// CHECK:STDOUT: %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {
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// CHECK:STDOUT: %e.patt: %pattern_type = binding_pattern e [concrete]
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// CHECK:STDOUT: %e.param_patt: %pattern_type = value_param_pattern %e.patt, call_param0 [concrete]
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// CHECK:STDOUT: } {
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// CHECK:STDOUT: %e.param: %UnsizedEnum = value_param call_param0
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// CHECK:STDOUT: %.loc12: type = splice_block %UnsizedEnum.ref [concrete = constants.%UnsizedEnum] {
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// CHECK:STDOUT: %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
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// CHECK:STDOUT: %UnsizedEnum.ref: type = name_ref UnsizedEnum, imports.%UnsizedEnum.decl [concrete = constants.%UnsizedEnum]
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// CHECK:STDOUT: }
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// CHECK:STDOUT: %e: %UnsizedEnum = bind_name e, %e.param
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// CHECK:STDOUT: }
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @F(%e.param: %UnsizedEnum);
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// CHECK:STDOUT:
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