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25f63140e6c380e7be92bb7f7e9844f275cd220d
carbon-lang/toolchain/check/testdata/interop/cpp/impls/copy.carbon
T
Jon Ross-Perkins 25f63140e6 Refactor CppWitness as CustomWitness (#6491) 
This is in anticipation of using the same construct for all
implementations of `Destroy`, as well as other similar use-cases with
language-defined interfaces.
2025-12-15 19:41:14 +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/impls/copy.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interop/cpp/impls/copy.carbon
// --- types.h
class Copyable {
public:
Copyable(const Copyable&);
};
class ExplicitCopy {
public:
explicit ExplicitCopy(const ExplicitCopy&);
};
class DeletedCopy {
public:
DeletedCopy(const DeletedCopy&) = delete;
};
class MoveOnly {
public:
MoveOnly(MoveOnly&&);
};
class DeletedMove {
public:
DeletedMove(DeletedMove&&) = delete;
};
class NonConstCopy {
public:
NonConstCopy(NonConstCopy&);
};
class AmbiguousCopy {
public:
AmbiguousCopy(const AmbiguousCopy&, int = 0);
AmbiguousCopy(const AmbiguousCopy&, char = 0);
};
class PrivateCopy {
private:
PrivateCopy(const PrivateCopy&);
};
class ProtectedCopy {
protected:
ProtectedCopy(const ProtectedCopy&);
};
// --- copy_copyable.carbon
library "[[@TEST_NAME]]";
import Cpp library "types.h";
fn CopyCopyable(c: Cpp.Copyable) -> Cpp.Copyable {
//@dump-sem-ir-begin
return c;
//@dump-sem-ir-end
}
fn CopyExplicitCopy(c: Cpp.ExplicitCopy) -> Cpp.ExplicitCopy {
//@dump-sem-ir-begin
return c;
//@dump-sem-ir-end
}
// --- fail_copy_noncopyable.carbon
library "[[@TEST_NAME]]";
import Cpp library "types.h";
fn CopyDeletedCopy(c: Cpp.DeletedCopy) -> Cpp.DeletedCopy {
// CHECK:STDERR: fail_copy_noncopyable.carbon:[[@LINE+8]]:10: error: attempt to use a deleted function [CppInteropParseError]
// CHECK:STDERR: 15 | return c;
// CHECK:STDERR: | ^
// CHECK:STDERR: fail_copy_noncopyable.carbon:[[@LINE-6]]:10: in file included here [InCppInclude]
// CHECK:STDERR: ./types.h:14:3: note: 'DeletedCopy' has been explicitly marked deleted here [CppInteropParseNote]
// CHECK:STDERR: 14 | DeletedCopy(const DeletedCopy&) = delete;
// CHECK:STDERR: | ^
// CHECK:STDERR:
return c;
}
fn CopyMoveOnly(c: Cpp.MoveOnly) -> Cpp.MoveOnly {
// CHECK:STDERR: fail_copy_noncopyable.carbon:[[@LINE+8]]:10: error: attempt to use a deleted function [CppInteropParseError]
// CHECK:STDERR: 27 | return c;
// CHECK:STDERR: | ^
// CHECK:STDERR: fail_copy_noncopyable.carbon:[[@LINE-18]]:10: in file included here [InCppInclude]
// CHECK:STDERR: ./types.h:19:3: note: copy constructor is implicitly deleted because 'MoveOnly' has a user-declared move constructor [CppInteropParseNote]
// CHECK:STDERR: 19 | MoveOnly(MoveOnly&&);
// CHECK:STDERR: | ^
// CHECK:STDERR:
return c;
}
fn CopyDeletedMove(c: Cpp.DeletedMove) -> Cpp.DeletedMove {
// CHECK:STDERR: fail_copy_noncopyable.carbon:[[@LINE+8]]:10: error: attempt to use a deleted function [CppInteropParseError]
// CHECK:STDERR: 39 | return c;
// CHECK:STDERR: | ^
// CHECK:STDERR: fail_copy_noncopyable.carbon:[[@LINE-30]]:10: in file included here [InCppInclude]
// CHECK:STDERR: ./types.h:24:3: note: copy constructor is implicitly deleted because 'DeletedMove' has a user-declared move constructor [CppInteropParseNote]
// CHECK:STDERR: 24 | DeletedMove(DeletedMove&&) = delete;
// CHECK:STDERR: | ^
// CHECK:STDERR:
return c;
}
fn CopyNonConstCopy(c: Cpp.NonConstCopy) -> Cpp.NonConstCopy {
// TODO: List candidates here.
// CHECK:STDERR: fail_copy_noncopyable.carbon:[[@LINE+7]]:10: error: cannot copy value of type `Cpp.NonConstCopy` [CopyOfUncopyableType]
// CHECK:STDERR: return c;
// CHECK:STDERR: ^
// CHECK:STDERR: fail_copy_noncopyable.carbon:[[@LINE+4]]:10: note: type `Cpp.NonConstCopy` does not implement interface `Core.Copy` [MissingImplInMemberAccessNote]
// CHECK:STDERR: return c;
// CHECK:STDERR: ^
// CHECK:STDERR:
return c;
}
fn CopyAmbiguousCopy(c: Cpp.AmbiguousCopy) -> Cpp.AmbiguousCopy {
// TODO: List candidates here.
// CHECK:STDERR: fail_copy_noncopyable.carbon:[[@LINE+7]]:10: error: cannot copy value of type `Cpp.AmbiguousCopy` [CopyOfUncopyableType]
// CHECK:STDERR: return c;
// CHECK:STDERR: ^
// CHECK:STDERR: fail_copy_noncopyable.carbon:[[@LINE+4]]:10: note: type `Cpp.AmbiguousCopy` does not implement interface `Core.Copy` [MissingImplInMemberAccessNote]
// CHECK:STDERR: return c;
// CHECK:STDERR: ^
// CHECK:STDERR:
return c;
}
fn CopyPrivateCopy(c: Cpp.PrivateCopy) -> Cpp.PrivateCopy {
// TODO: Note is missing location.
// CHECK:STDERR: fail_copy_noncopyable.carbon:[[@LINE+5]]:10: error: cannot access private member `PrivateCopy` of type `Cpp.PrivateCopy` [ClassInvalidMemberAccess]
// CHECK:STDERR: return c;
// CHECK:STDERR: ^
// CHECK:STDERR: fail_copy_noncopyable.carbon: note: declared here [ClassMemberDeclaration]
// CHECK:STDERR:
return c;
}
fn CopyProtectedCopy(c: Cpp.ProtectedCopy) -> Cpp.ProtectedCopy {
// TODO: Note is missing location.
// CHECK:STDERR: fail_copy_noncopyable.carbon:[[@LINE+5]]:10: error: cannot access protected member `ProtectedCopy` of type `Cpp.ProtectedCopy` [ClassInvalidMemberAccess]
// CHECK:STDERR: return c;
// CHECK:STDERR: ^
// CHECK:STDERR: fail_copy_noncopyable.carbon: note: declared here [ClassMemberDeclaration]
// CHECK:STDERR:
return c;
}
// --- copy_generically.carbon
library "[[@TEST_NAME]]";
import Cpp library "types.h";
fn Copy[T:! Core.Copy](c: T) -> T {
return c;
}
fn DoCopy(c: Cpp.Copyable) -> Cpp.Copyable {
//@dump-sem-ir-begin
return Copy(c);
//@dump-sem-ir-end
}
class Wrap(T:! Core.Copy) {}
fn EqualWitnesses(p: Wrap(Cpp.Copyable)*) -> Wrap(Cpp.Copyable)* {
//@dump-sem-ir-begin
return p;
//@dump-sem-ir-end
}
// CHECK:STDOUT: --- copy_copyable.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %Copyable: type = class_type @Copyable [concrete]
// CHECK:STDOUT: %Copy.type: type = facet_type <@Copy> [concrete]
// CHECK:STDOUT: %Copy.Op.type: type = fn_type @Copy.Op [concrete]
// CHECK:STDOUT: %Copyable.Copyable.type: type = fn_type @Copyable.Copyable [concrete]
// CHECK:STDOUT: %Copyable.Copyable: %Copyable.Copyable.type = struct_value () [concrete]
// CHECK:STDOUT: %const.622: type = const_type %Copyable [concrete]
// CHECK:STDOUT: %ptr.29d: type = ptr_type %const.622 [concrete]
// CHECK:STDOUT: %ptr.e47: type = ptr_type %Copyable [concrete]
// CHECK:STDOUT: %Copyable__carbon_thunk.type: type = fn_type @Copyable__carbon_thunk [concrete]
// CHECK:STDOUT: %Copyable__carbon_thunk: %Copyable__carbon_thunk.type = struct_value () [concrete]
// CHECK:STDOUT: %Copyable.Op.type: type = fn_type @Copyable.Op [concrete]
// CHECK:STDOUT: %Copyable.Op: %Copyable.Op.type = struct_value () [concrete]
// CHECK:STDOUT: %custom_witness.0b0: <witness> = custom_witness (%Copyable.Op) [concrete]
// CHECK:STDOUT: %Copy.facet.157: %Copy.type = facet_value %Copyable, (%custom_witness.0b0) [concrete]
// CHECK:STDOUT: %.07b: type = fn_type_with_self_type %Copy.Op.type, %Copy.facet.157 [concrete]
// CHECK:STDOUT: %ExplicitCopy: type = class_type @ExplicitCopy [concrete]
// CHECK:STDOUT: %ExplicitCopy.ExplicitCopy.type: type = fn_type @ExplicitCopy.ExplicitCopy [concrete]
// CHECK:STDOUT: %ExplicitCopy.ExplicitCopy: %ExplicitCopy.ExplicitCopy.type = struct_value () [concrete]
// CHECK:STDOUT: %const.d8d: type = const_type %ExplicitCopy [concrete]
// CHECK:STDOUT: %ptr.093: type = ptr_type %const.d8d [concrete]
// CHECK:STDOUT: %ptr.84c: type = ptr_type %ExplicitCopy [concrete]
// CHECK:STDOUT: %ExplicitCopy__carbon_thunk.type: type = fn_type @ExplicitCopy__carbon_thunk [concrete]
// CHECK:STDOUT: %ExplicitCopy__carbon_thunk: %ExplicitCopy__carbon_thunk.type = struct_value () [concrete]
// CHECK:STDOUT: %ExplicitCopy.Op.type: type = fn_type @ExplicitCopy.Op [concrete]
// CHECK:STDOUT: %ExplicitCopy.Op: %ExplicitCopy.Op.type = struct_value () [concrete]
// CHECK:STDOUT: %custom_witness.fa3: <witness> = custom_witness (%ExplicitCopy.Op) [concrete]
// CHECK:STDOUT: %Copy.facet.40c: %Copy.type = facet_value %ExplicitCopy, (%custom_witness.fa3) [concrete]
// CHECK:STDOUT: %.167: type = fn_type_with_self_type %Copy.Op.type, %Copy.facet.40c [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Copyable.Copyable.decl: %Copyable.Copyable.type = fn_decl @Copyable.Copyable [concrete = constants.%Copyable.Copyable] {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: } {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT: %Copyable__carbon_thunk.decl: %Copyable__carbon_thunk.type = fn_decl @Copyable__carbon_thunk [concrete = constants.%Copyable__carbon_thunk] {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: } {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT: %ExplicitCopy.ExplicitCopy.decl: %ExplicitCopy.ExplicitCopy.type = fn_decl @ExplicitCopy.ExplicitCopy [concrete = constants.%ExplicitCopy.ExplicitCopy] {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: } {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT: %ExplicitCopy__carbon_thunk.decl: %ExplicitCopy__carbon_thunk.type = fn_decl @ExplicitCopy__carbon_thunk [concrete = constants.%ExplicitCopy__carbon_thunk] {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: } {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @CopyCopyable(%c.param: %Copyable) -> %return.param: %Copyable {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %c.ref: %Copyable = name_ref c, %c
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %impl.elem0: %.07b = impl_witness_access constants.%custom_witness.0b0, element0 [concrete = constants.%Copyable.Op]
// CHECK:STDOUT: %bound_method: <bound method> = bound_method %c.ref, %impl.elem0
// CHECK:STDOUT: %.loc8_10.1: ref %Copyable = temporary_storage
// CHECK:STDOUT: %Op.ref: %Copyable.Copyable.type = name_ref Op, imports.%Copyable.Copyable.decl [concrete = constants.%Copyable.Copyable]
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %.loc8_10.2: ref %Copyable = value_as_ref %c.ref
// CHECK:STDOUT: %addr.loc8_10.1: %ptr.e47 = addr_of %.loc8_10.2
// CHECK:STDOUT: %.loc8_10.3: %ptr.29d = as_compatible %addr.loc8_10.1
// CHECK:STDOUT: %.loc8_10.4: %ptr.29d = converted %addr.loc8_10.1, %.loc8_10.3
// CHECK:STDOUT: %addr.loc8_10.2: %ptr.e47 = addr_of %.loc6_34
// CHECK:STDOUT: %Copyable__carbon_thunk.call: init %empty_tuple.type = call imports.%Copyable__carbon_thunk.decl(%.loc8_10.4, %addr.loc8_10.2)
// CHECK:STDOUT: %.loc8_10.5: init %Copyable = in_place_init %Copyable__carbon_thunk.call, %.loc6_34
// CHECK:STDOUT: return %.loc8_10.5 to %return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @CopyExplicitCopy(%c.param: %ExplicitCopy) -> %return.param: %ExplicitCopy {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %c.ref: %ExplicitCopy = name_ref c, %c
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %impl.elem0: %.167 = impl_witness_access constants.%custom_witness.fa3, element0 [concrete = constants.%ExplicitCopy.Op]
// CHECK:STDOUT: %bound_method: <bound method> = bound_method %c.ref, %impl.elem0
// CHECK:STDOUT: %.loc14_10.1: ref %ExplicitCopy = temporary_storage
// CHECK:STDOUT: %Op.ref: %ExplicitCopy.ExplicitCopy.type = name_ref Op, imports.%ExplicitCopy.ExplicitCopy.decl [concrete = constants.%ExplicitCopy.ExplicitCopy]
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %.loc14_10.2: ref %ExplicitCopy = value_as_ref %c.ref
// CHECK:STDOUT: %addr.loc14_10.1: %ptr.84c = addr_of %.loc14_10.2
// CHECK:STDOUT: %.loc14_10.3: %ptr.093 = as_compatible %addr.loc14_10.1
// CHECK:STDOUT: %.loc14_10.4: %ptr.093 = converted %addr.loc14_10.1, %.loc14_10.3
// CHECK:STDOUT: %addr.loc14_10.2: %ptr.84c = addr_of %.loc12_42
// CHECK:STDOUT: %ExplicitCopy__carbon_thunk.call: init %empty_tuple.type = call imports.%ExplicitCopy__carbon_thunk.decl(%.loc14_10.4, %addr.loc14_10.2)
// CHECK:STDOUT: %.loc14_10.5: init %ExplicitCopy = in_place_init %ExplicitCopy__carbon_thunk.call, %.loc12_42
// CHECK:STDOUT: return %.loc14_10.5 to %return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- copy_generically.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Copy.type.705: type = facet_type <@Copy.1> [concrete]
// CHECK:STDOUT: %Copy.type.6f0: type = fn_type @Copy.loc6 [concrete]
// CHECK:STDOUT: %Copy: %Copy.type.6f0 = struct_value () [concrete]
// CHECK:STDOUT: %Copy.Op.type: type = fn_type @Copy.Op [concrete]
// CHECK:STDOUT: %T.67d: type = symbolic_binding T, 0 [symbolic]
// CHECK:STDOUT: %ptr.as.Copy.impl.Op.type.b05: type = fn_type @ptr.as.Copy.impl.Op, @ptr.as.Copy.impl(%T.67d) [symbolic]
// CHECK:STDOUT: %ptr.as.Copy.impl.Op.8b8: %ptr.as.Copy.impl.Op.type.b05 = struct_value () [symbolic]
// CHECK:STDOUT: %Copyable: type = class_type @Copyable [concrete]
// CHECK:STDOUT: %Copyable.Op.type: type = fn_type @Copyable.Op [concrete]
// CHECK:STDOUT: %Copyable.Op: %Copyable.Op.type = struct_value () [concrete]
// CHECK:STDOUT: %custom_witness.0b0: <witness> = custom_witness (%Copyable.Op) [concrete]
// CHECK:STDOUT: %Copy.facet.157: %Copy.type.705 = facet_value %Copyable, (%custom_witness.0b0) [concrete]
// CHECK:STDOUT: %Copy.specific_fn: <specific function> = specific_function %Copy, @Copy.loc6(%Copy.facet.157) [concrete]
// CHECK:STDOUT: %Wrap.7dc: type = class_type @Wrap, @Wrap(%Copy.facet.157) [concrete]
// CHECK:STDOUT: %ptr.62c: type = ptr_type %Wrap.7dc [concrete]
// CHECK:STDOUT: %Copy.impl_witness.1e6: <witness> = impl_witness imports.%Copy.impl_witness_table.027, @ptr.as.Copy.impl(%Wrap.7dc) [concrete]
// CHECK:STDOUT: %ptr.as.Copy.impl.Op.type.518: type = fn_type @ptr.as.Copy.impl.Op, @ptr.as.Copy.impl(%Wrap.7dc) [concrete]
// CHECK:STDOUT: %ptr.as.Copy.impl.Op.fff: %ptr.as.Copy.impl.Op.type.518 = struct_value () [concrete]
// CHECK:STDOUT: %Copy.facet.622: %Copy.type.705 = facet_value %ptr.62c, (%Copy.impl_witness.1e6) [concrete]
// CHECK:STDOUT: %.19b: type = fn_type_with_self_type %Copy.Op.type, %Copy.facet.622 [concrete]
// CHECK:STDOUT: %ptr.as.Copy.impl.Op.specific_fn: <specific function> = specific_function %ptr.as.Copy.impl.Op.fff, @ptr.as.Copy.impl.Op(%Wrap.7dc) [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core.import_ref.301: @ptr.as.Copy.impl.%ptr.as.Copy.impl.Op.type (%ptr.as.Copy.impl.Op.type.b05) = import_ref Core//prelude/parts/copy, loc{{\d+_\d+}}, loaded [symbolic = @ptr.as.Copy.impl.%ptr.as.Copy.impl.Op (constants.%ptr.as.Copy.impl.Op.8b8)]
// CHECK:STDOUT: %Copy.impl_witness_table.027 = impl_witness_table (%Core.import_ref.301), @ptr.as.Copy.impl [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @DoCopy(%c.param: %Copyable) -> %return.param: %Copyable {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %Copy.ref: %Copy.type.6f0 = name_ref Copy, file.%Copy.decl [concrete = constants.%Copy]
// CHECK:STDOUT: %c.ref: %Copyable = name_ref c, %c
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %Copy.facet.loc12_16.1: %Copy.type.705 = facet_value constants.%Copyable, (constants.%custom_witness.0b0) [concrete = constants.%Copy.facet.157]
// CHECK:STDOUT: %.loc12_16.1: %Copy.type.705 = converted constants.%Copyable, %Copy.facet.loc12_16.1 [concrete = constants.%Copy.facet.157]
// CHECK:STDOUT: %Copy.facet.loc12_16.2: %Copy.type.705 = facet_value constants.%Copyable, (constants.%custom_witness.0b0) [concrete = constants.%Copy.facet.157]
// CHECK:STDOUT: %.loc12_16.2: %Copy.type.705 = converted constants.%Copyable, %Copy.facet.loc12_16.2 [concrete = constants.%Copy.facet.157]
// CHECK:STDOUT: %Copy.specific_fn: <specific function> = specific_function %Copy.ref, @Copy.loc6(constants.%Copy.facet.157) [concrete = constants.%Copy.specific_fn]
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %Copy.call: init %Copyable = call %Copy.specific_fn(%c.ref) to %.loc10_28
// CHECK:STDOUT: return %Copy.call to %return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @EqualWitnesses(%p.param: %ptr.62c) -> %ptr.62c {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %p.ref: %ptr.62c = name_ref p, %p
// CHECK:STDOUT: %impl.elem0: %.19b = impl_witness_access constants.%Copy.impl_witness.1e6, element0 [concrete = constants.%ptr.as.Copy.impl.Op.fff]
// CHECK:STDOUT: %bound_method.loc20_10.1: <bound method> = bound_method %p.ref, %impl.elem0
// CHECK:STDOUT: %specific_fn: <specific function> = specific_function %impl.elem0, @ptr.as.Copy.impl.Op(constants.%Wrap.7dc) [concrete = constants.%ptr.as.Copy.impl.Op.specific_fn]
// CHECK:STDOUT: %bound_method.loc20_10.2: <bound method> = bound_method %p.ref, %specific_fn
// CHECK:STDOUT: %ptr.as.Copy.impl.Op.call: init %ptr.62c = call %bound_method.loc20_10.2(%p.ref)
// CHECK:STDOUT: return %ptr.as.Copy.impl.Op.call to %return
// CHECK:STDOUT: }
// CHECK:STDOUT:
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