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carbon-lang/toolchain/check/testdata/interop/cpp/function/decayed_param.carbon
T
Richard SmithandJon Ross-Perkins 1e7b7e53ae C++ interop: support for default arguments. (#6108) 
The general strategy here is to force use of a thunk when we want to use
default arguments, and have Clang generate uses of the default arguments
on its side of the thunk.

To support this, change the key type used in `clang_decls` from being
just a `Decl*` to being a pair of `Decl*` and number of parameters in
the case of function decls. Import distinct `SemIR::Function`s for each
number of parameters that's used, and corresponding distinct thunks.

---------

Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
2025-09-24 01:07:59 +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/function/decayed_param.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interop/cpp/function/decayed_param.carbon
// --- params.h
void TakesArray(int arr[42]);
void TakesFunction(int f(int));
int Function(int);
// --- fail_todo_call_params.carbon
library "[[@TEST_NAME]]";
import Cpp library "params.h";
fn G(n: i32) -> i32;
fn F() {
//@dump-sem-ir-begin
var n: array(i32, 42);
// CHECK:STDERR: fail_todo_call_params.carbon:[[@LINE+4]]:3: error: semantics TODO: `Unsupported: parameter type: int *` [SemanticsTodo]
// CHECK:STDERR: Cpp.TakesArray(&n[0]);
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
Cpp.TakesArray(&n[0]);
// CHECK:STDERR: fail_todo_call_params.carbon:[[@LINE+4]]:18: error: member name `nullptr` not found in `Cpp` [MemberNameNotFoundInInstScope]
// CHECK:STDERR: Cpp.TakesArray(Cpp.nullptr);
// CHECK:STDERR: ^~~~~~~~~~~
// CHECK:STDERR:
Cpp.TakesArray(Cpp.nullptr);
// CHECK:STDERR: fail_todo_call_params.carbon:[[@LINE+4]]:21: error: call argument of type `<type of G>` is not supported [CppCallArgTypeNotSupported]
// CHECK:STDERR: Cpp.TakesFunction(G);
// CHECK:STDERR: ^
// CHECK:STDERR:
Cpp.TakesFunction(G);
// CHECK:STDERR: fail_todo_call_params.carbon:[[@LINE+4]]:21: error: call argument of type `<type of Cpp.Function>` is not supported [CppCallArgTypeNotSupported]
// CHECK:STDERR: Cpp.TakesFunction(Cpp.Function);
// CHECK:STDERR: ^~~~~~~~~~~~
// CHECK:STDERR:
Cpp.TakesFunction(Cpp.Function);
// CHECK:STDERR: fail_todo_call_params.carbon:[[@LINE+8]]:26: error: no matching function for call to 'TakesFunction' [CppInteropParseError]
// CHECK:STDERR: 43 | Cpp.TakesFunction(&n[0]);
// CHECK:STDERR: | ^
// CHECK:STDERR: fail_todo_call_params.carbon:[[@LINE-34]]:10: in file included here [InCppInclude]
// CHECK:STDERR: ./params.h:3:6: note: candidate function not viable: no known conversion from 'int * _Nonnull' to 'int (*)(int)' for 1st argument [CppInteropParseNote]
// CHECK:STDERR: 3 | void TakesFunction(int f(int));
// CHECK:STDERR: | ^ ~~~~~~~~~~
// CHECK:STDERR:
Cpp.TakesFunction(&n[0]);
// CHECK:STDERR: fail_todo_call_params.carbon:[[@LINE+4]]:21: error: member name `nullptr` not found in `Cpp` [MemberNameNotFoundInInstScope]
// CHECK:STDERR: Cpp.TakesFunction(Cpp.nullptr);
// CHECK:STDERR: ^~~~~~~~~~~
// CHECK:STDERR:
Cpp.TakesFunction(Cpp.nullptr);
//@dump-sem-ir-end
}
// CHECK:STDOUT: --- fail_todo_call_params.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %int_32: Core.IntLiteral = int_value 32 [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %i32: type = class_type @Int, @Int(%int_32) [concrete]
// CHECK:STDOUT: %G.type: type = fn_type @G [concrete]
// CHECK:STDOUT: %G: %G.type = struct_value () [concrete]
// CHECK:STDOUT: %int_42: Core.IntLiteral = int_value 42 [concrete]
// CHECK:STDOUT: %array_type: type = array_type %int_42, %i32 [concrete]
// CHECK:STDOUT: %ptr.830: type = ptr_type %array_type [concrete]
// CHECK:STDOUT: %pattern_type.b6e: type = pattern_type %array_type [concrete]
// CHECK:STDOUT: %.cdf: type = cpp_overload_set_type @Core.IntLiteral.as.ImplicitAs.impl.Convert [concrete]
// CHECK:STDOUT: %empty_struct.5c5: %.cdf = struct_value () [concrete]
// CHECK:STDOUT: %int_0.5c6: Core.IntLiteral = int_value 0 [concrete]
// CHECK:STDOUT: %ImplicitAs.type.d14: type = facet_type <@ImplicitAs, @ImplicitAs(%i32)> [concrete]
// CHECK:STDOUT: %ImplicitAs.Convert.type.1b6: type = fn_type @ImplicitAs.Convert, @ImplicitAs(%i32) [concrete]
// CHECK:STDOUT: %To: Core.IntLiteral = bind_symbolic_name To, 0 [symbolic]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.340: type = fn_type @Core.IntLiteral.as.ImplicitAs.impl.Convert, @Core.IntLiteral.as.ImplicitAs.impl(%To) [symbolic]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.1c0: %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.340 = struct_value () [symbolic]
// CHECK:STDOUT: %ImplicitAs.impl_witness.204: <witness> = impl_witness imports.%ImplicitAs.impl_witness_table.9e9, @Core.IntLiteral.as.ImplicitAs.impl(%int_32) [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.584: type = fn_type @Core.IntLiteral.as.ImplicitAs.impl.Convert, @Core.IntLiteral.as.ImplicitAs.impl(%int_32) [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.0f0: %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.584 = struct_value () [concrete]
// CHECK:STDOUT: %ImplicitAs.facet: %ImplicitAs.type.d14 = facet_value Core.IntLiteral, (%ImplicitAs.impl_witness.204) [concrete]
// CHECK:STDOUT: %.1df: type = fn_type_with_self_type %ImplicitAs.Convert.type.1b6, %ImplicitAs.facet [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.bound: <bound method> = bound_method %int_0.5c6, %Core.IntLiteral.as.ImplicitAs.impl.Convert.0f0 [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn: <specific function> = specific_function %Core.IntLiteral.as.ImplicitAs.impl.Convert.0f0, @Core.IntLiteral.as.ImplicitAs.impl.Convert(%int_32) [concrete]
// CHECK:STDOUT: %bound_method: <bound method> = bound_method %int_0.5c6, %Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn [concrete]
// CHECK:STDOUT: %int_0.6a9: %i32 = int_value 0 [concrete]
// CHECK:STDOUT: %ptr.235: type = ptr_type %i32 [concrete]
// CHECK:STDOUT: %.319: type = cpp_overload_set_type @Int.as.ImplicitAs.impl.Convert [concrete]
// CHECK:STDOUT: %empty_struct.45a: %.319 = struct_value () [concrete]
// CHECK:STDOUT: %.001: type = cpp_overload_set_type @Destroy.Op [concrete]
// CHECK:STDOUT: %empty_struct.89b: %.001 = struct_value () [concrete]
// CHECK:STDOUT: %type_where: type = facet_type <type where .Self impls <CanAggregateDestroy>> [concrete]
// CHECK:STDOUT: %facet_value: %type_where = facet_value %array_type, () [concrete]
// CHECK:STDOUT: %AggregateT.as_type.as.Destroy.impl.Op.type.b6e: type = fn_type @AggregateT.as_type.as.Destroy.impl.Op, @AggregateT.as_type.as.Destroy.impl(%facet_value) [concrete]
// CHECK:STDOUT: %AggregateT.as_type.as.Destroy.impl.Op.91f: %AggregateT.as_type.as.Destroy.impl.Op.type.b6e = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .TakesArray = %.782
// CHECK:STDOUT: .nullptr = <poisoned>
// CHECK:STDOUT: .TakesFunction = %.a02
// CHECK:STDOUT: .Function = %.5ec
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %.782: %.cdf = cpp_overload_set_value @Core.IntLiteral.as.ImplicitAs.impl.Convert [concrete = constants.%empty_struct.5c5]
// CHECK:STDOUT: %Core.import_ref.ee7: @Core.IntLiteral.as.ImplicitAs.impl.%Core.IntLiteral.as.ImplicitAs.impl.Convert.type (%Core.IntLiteral.as.ImplicitAs.impl.Convert.type.340) = import_ref Core//prelude/parts/int, loc23_39, loaded [symbolic = @Core.IntLiteral.as.ImplicitAs.impl.%Core.IntLiteral.as.ImplicitAs.impl.Convert (constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.1c0)]
// CHECK:STDOUT: %ImplicitAs.impl_witness_table.9e9 = impl_witness_table (%Core.import_ref.ee7), @Core.IntLiteral.as.ImplicitAs.impl [concrete]
// CHECK:STDOUT: %.a02: %.319 = cpp_overload_set_value @Int.as.ImplicitAs.impl.Convert [concrete = constants.%empty_struct.45a]
// CHECK:STDOUT: %.5ec: %.001 = cpp_overload_set_value @Destroy.Op [concrete = constants.%empty_struct.89b]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %n.patt: %pattern_type.b6e = binding_pattern n [concrete]
// CHECK:STDOUT: %n.var_patt: %pattern_type.b6e = var_pattern %n.patt [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %n.var: ref %array_type = var %n.var_patt
// CHECK:STDOUT: %.loc10_23: type = splice_block %array_type [concrete = constants.%array_type] {
// CHECK:STDOUT: %int_32.loc10: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
// CHECK:STDOUT: %i32.loc10: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
// CHECK:STDOUT: %int_42: Core.IntLiteral = int_value 42 [concrete = constants.%int_42]
// CHECK:STDOUT: %array_type: type = array_type %int_42, %i32.loc10 [concrete = constants.%array_type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %n: ref %array_type = bind_name n, %n.var
// CHECK:STDOUT: %Cpp.ref.loc15: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %TakesArray.ref.loc15: %.cdf = name_ref TakesArray, imports.%.782 [concrete = constants.%empty_struct.5c5]
// CHECK:STDOUT: %n.ref.loc15: ref %array_type = name_ref n, %n
// CHECK:STDOUT: %int_0.loc15: Core.IntLiteral = int_value 0 [concrete = constants.%int_0.5c6]
// CHECK:STDOUT: %int_32.loc15: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
// CHECK:STDOUT: %i32.loc15: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
// CHECK:STDOUT: %impl.elem0.loc15: %.1df = impl_witness_access constants.%ImplicitAs.impl_witness.204, element0 [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.0f0]
// CHECK:STDOUT: %bound_method.loc15_21.1: <bound method> = bound_method %int_0.loc15, %impl.elem0.loc15 [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.bound]
// CHECK:STDOUT: %specific_fn.loc15: <specific function> = specific_function %impl.elem0.loc15, @Core.IntLiteral.as.ImplicitAs.impl.Convert(constants.%int_32) [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn]
// CHECK:STDOUT: %bound_method.loc15_21.2: <bound method> = bound_method %int_0.loc15, %specific_fn.loc15 [concrete = constants.%bound_method]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.call.loc15: init %i32 = call %bound_method.loc15_21.2(%int_0.loc15) [concrete = constants.%int_0.6a9]
// CHECK:STDOUT: %.loc15_21.1: %i32 = value_of_initializer %Core.IntLiteral.as.ImplicitAs.impl.Convert.call.loc15 [concrete = constants.%int_0.6a9]
// CHECK:STDOUT: %.loc15_21.2: %i32 = converted %int_0.loc15, %.loc15_21.1 [concrete = constants.%int_0.6a9]
// CHECK:STDOUT: %.loc15_22: ref %i32 = array_index %n.ref.loc15, %.loc15_21.2
// CHECK:STDOUT: %addr.loc15: %ptr.235 = addr_of %.loc15_22
// CHECK:STDOUT: %Cpp.ref.loc21_3: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %TakesArray.ref.loc21: %.cdf = name_ref TakesArray, imports.%.782 [concrete = constants.%empty_struct.5c5]
// CHECK:STDOUT: %Cpp.ref.loc21_18: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %nullptr.ref.loc21: <error> = name_ref nullptr, <error> [concrete = <error>]
// CHECK:STDOUT: %Cpp.ref.loc27: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %TakesFunction.ref.loc27: %.319 = name_ref TakesFunction, imports.%.a02 [concrete = constants.%empty_struct.45a]
// CHECK:STDOUT: %G.ref: %G.type = name_ref G, file.%G.decl [concrete = constants.%G]
// CHECK:STDOUT: %Cpp.ref.loc33_3: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %TakesFunction.ref.loc33: %.319 = name_ref TakesFunction, imports.%.a02 [concrete = constants.%empty_struct.45a]
// CHECK:STDOUT: %Cpp.ref.loc33_21: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Function.ref: %.001 = name_ref Function, imports.%.5ec [concrete = constants.%empty_struct.89b]
// CHECK:STDOUT: %Cpp.ref.loc43: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %TakesFunction.ref.loc43: %.319 = name_ref TakesFunction, imports.%.a02 [concrete = constants.%empty_struct.45a]
// CHECK:STDOUT: %n.ref.loc43: ref %array_type = name_ref n, %n
// CHECK:STDOUT: %int_0.loc43: Core.IntLiteral = int_value 0 [concrete = constants.%int_0.5c6]
// CHECK:STDOUT: %int_32.loc43: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
// CHECK:STDOUT: %i32.loc43: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
// CHECK:STDOUT: %impl.elem0.loc43: %.1df = impl_witness_access constants.%ImplicitAs.impl_witness.204, element0 [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.0f0]
// CHECK:STDOUT: %bound_method.loc43_24.1: <bound method> = bound_method %int_0.loc43, %impl.elem0.loc43 [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.bound]
// CHECK:STDOUT: %specific_fn.loc43: <specific function> = specific_function %impl.elem0.loc43, @Core.IntLiteral.as.ImplicitAs.impl.Convert(constants.%int_32) [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn]
// CHECK:STDOUT: %bound_method.loc43_24.2: <bound method> = bound_method %int_0.loc43, %specific_fn.loc43 [concrete = constants.%bound_method]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.call.loc43: init %i32 = call %bound_method.loc43_24.2(%int_0.loc43) [concrete = constants.%int_0.6a9]
// CHECK:STDOUT: %.loc43_24.1: %i32 = value_of_initializer %Core.IntLiteral.as.ImplicitAs.impl.Convert.call.loc43 [concrete = constants.%int_0.6a9]
// CHECK:STDOUT: %.loc43_24.2: %i32 = converted %int_0.loc43, %.loc43_24.1 [concrete = constants.%int_0.6a9]
// CHECK:STDOUT: %.loc43_25: ref %i32 = array_index %n.ref.loc43, %.loc43_24.2
// CHECK:STDOUT: %addr.loc43: %ptr.235 = addr_of %.loc43_25
// CHECK:STDOUT: %Cpp.ref.loc49_3: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %TakesFunction.ref.loc49: %.319 = name_ref TakesFunction, imports.%.a02 [concrete = constants.%empty_struct.45a]
// CHECK:STDOUT: %Cpp.ref.loc49_21: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %nullptr.ref.loc49: <error> = name_ref nullptr, <error> [concrete = <error>]
// CHECK:STDOUT: %facet_value: %type_where = facet_value constants.%array_type, () [concrete = constants.%facet_value]
// CHECK:STDOUT: %.loc10_3: %type_where = converted constants.%array_type, %facet_value [concrete = constants.%facet_value]
// CHECK:STDOUT: %AggregateT.as_type.as.Destroy.impl.Op.bound: <bound method> = bound_method %n.var, constants.%AggregateT.as_type.as.Destroy.impl.Op.91f
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %bound_method.loc10: <bound method> = bound_method %n.var, %AggregateT.as_type.as.Destroy.impl.Op.specific_fn
// CHECK:STDOUT: %addr.loc10: %ptr.830 = addr_of %n.var
// CHECK:STDOUT: %AggregateT.as_type.as.Destroy.impl.Op.call: init %empty_tuple.type = call %bound_method.loc10(%addr.loc10)
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
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