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carbon-lang/toolchain/check/testdata/interop/cpp/function/qualified_param.carbon
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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/qualified_param.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interop/cpp/function/qualified_param.carbon
// --- qualifiers.h
void TakesConstInt(const int);
struct S {};
void TakesConstS(const S);
// --- call_qualifiers.carbon
library "[[@TEST_NAME]]";
import Cpp library "qualifiers.h";
fn F() {
//@dump-sem-ir-begin
Cpp.TakesConstInt(42);
var s: Cpp.S = {};
Cpp.TakesConstS(s);
//@dump-sem-ir-end
}
// CHECK:STDOUT: --- call_qualifiers.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %.fc4: type = cpp_overload_set_type @ImplicitAs.Convert [concrete]
// CHECK:STDOUT: %empty_struct.cca: %.fc4 = struct_value () [concrete]
// CHECK:STDOUT: %int_42.20e: Core.IntLiteral = int_value 42 [concrete]
// CHECK:STDOUT: %int_32: Core.IntLiteral = int_value 32 [concrete]
// CHECK:STDOUT: %i32: type = class_type @Int, @Int(%int_32) [concrete]
// CHECK:STDOUT: %TakesConstInt.type: type = fn_type @TakesConstInt [concrete]
// CHECK:STDOUT: %TakesConstInt: %TakesConstInt.type = struct_value () [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_42.20e, %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_42.20e, %Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn [concrete]
// CHECK:STDOUT: %int_42.c68: %i32 = int_value 42 [concrete]
// CHECK:STDOUT: %S: type = class_type @S [concrete]
// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
// CHECK:STDOUT: %pattern_type.7da: type = pattern_type %S [concrete]
// CHECK:STDOUT: %S.val: %S = struct_value () [concrete]
// CHECK:STDOUT: %.289: type = cpp_overload_set_type @Core.IntLiteral.as.ImplicitAs.impl.Convert [concrete]
// CHECK:STDOUT: %empty_struct.269: %.289 = struct_value () [concrete]
// CHECK:STDOUT: %const.e39: type = const_type %S [concrete]
// CHECK:STDOUT: %ptr.ff5: type = ptr_type %const.e39 [concrete]
// CHECK:STDOUT: %TakesConstS__carbon_thunk.type: type = fn_type @TakesConstS__carbon_thunk [concrete]
// CHECK:STDOUT: %TakesConstS__carbon_thunk: %TakesConstS__carbon_thunk.type = struct_value () [concrete]
// CHECK:STDOUT: %ptr.5c7: type = ptr_type %S [concrete]
// CHECK:STDOUT: %type_where: type = facet_type <type where .Self impls <CanAggregateDestroy>> [concrete]
// CHECK:STDOUT: %facet_value: %type_where = facet_value %S, () [concrete]
// CHECK:STDOUT: %AggregateT.as_type.as.Destroy.impl.Op.type.df1: 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.cc2: %AggregateT.as_type.as.Destroy.impl.Op.type.df1 = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .TakesConstInt = %.6a4
// CHECK:STDOUT: .S = %S.decl
// CHECK:STDOUT: .TakesConstS = %.7c2
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %.6a4: %.fc4 = cpp_overload_set_value @ImplicitAs.Convert [concrete = constants.%empty_struct.cca]
// CHECK:STDOUT: %TakesConstInt.decl: %TakesConstInt.type = fn_decl @TakesConstInt [concrete = constants.%TakesConstInt] {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: } {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// 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: %S.decl: type = class_decl @S [concrete = constants.%S] {} {}
// CHECK:STDOUT: %.7c2: %.289 = cpp_overload_set_value @Core.IntLiteral.as.ImplicitAs.impl.Convert [concrete = constants.%empty_struct.269]
// CHECK:STDOUT: %TakesConstS__carbon_thunk.decl: %TakesConstS__carbon_thunk.type = fn_decl @TakesConstS__carbon_thunk [concrete = constants.%TakesConstS__carbon_thunk] {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: } {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %Cpp.ref.loc8: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %TakesConstInt.ref: %.fc4 = name_ref TakesConstInt, imports.%.6a4 [concrete = constants.%empty_struct.cca]
// CHECK:STDOUT: %int_42: Core.IntLiteral = int_value 42 [concrete = constants.%int_42.20e]
// CHECK:STDOUT: %impl.elem0: %.1df = impl_witness_access constants.%ImplicitAs.impl_witness.204, element0 [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.0f0]
// CHECK:STDOUT: %bound_method.loc8_21.1: <bound method> = bound_method %int_42, %impl.elem0 [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.bound]
// CHECK:STDOUT: %specific_fn: <specific function> = specific_function %impl.elem0, @Core.IntLiteral.as.ImplicitAs.impl.Convert(constants.%int_32) [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn]
// CHECK:STDOUT: %bound_method.loc8_21.2: <bound method> = bound_method %int_42, %specific_fn [concrete = constants.%bound_method]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.call: init %i32 = call %bound_method.loc8_21.2(%int_42) [concrete = constants.%int_42.c68]
// CHECK:STDOUT: %.loc8_21.1: %i32 = value_of_initializer %Core.IntLiteral.as.ImplicitAs.impl.Convert.call [concrete = constants.%int_42.c68]
// CHECK:STDOUT: %.loc8_21.2: %i32 = converted %int_42, %.loc8_21.1 [concrete = constants.%int_42.c68]
// CHECK:STDOUT: %TakesConstInt.call: init %empty_tuple.type = call imports.%TakesConstInt.decl(%.loc8_21.2)
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %s.patt: %pattern_type.7da = binding_pattern s [concrete]
// CHECK:STDOUT: %s.var_patt: %pattern_type.7da = var_pattern %s.patt [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %s.var: ref %S = var %s.var_patt
// CHECK:STDOUT: %.loc10_19.1: %empty_struct_type = struct_literal ()
// CHECK:STDOUT: %.loc10_19.2: init %S = class_init (), %s.var [concrete = constants.%S.val]
// CHECK:STDOUT: %.loc10_3.1: init %S = converted %.loc10_19.1, %.loc10_19.2 [concrete = constants.%S.val]
// CHECK:STDOUT: assign %s.var, %.loc10_3.1
// CHECK:STDOUT: %.loc10_13: type = splice_block %S.ref [concrete = constants.%S] {
// CHECK:STDOUT: %Cpp.ref.loc10: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %S.ref: type = name_ref S, imports.%S.decl [concrete = constants.%S]
// CHECK:STDOUT: }
// CHECK:STDOUT: %s: ref %S = bind_name s, %s.var
// CHECK:STDOUT: %Cpp.ref.loc11: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %TakesConstS.ref: %.289 = name_ref TakesConstS, imports.%.7c2 [concrete = constants.%empty_struct.269]
// CHECK:STDOUT: %s.ref: ref %S = name_ref s, %s
// CHECK:STDOUT: %.loc11_19.1: %S = bind_value %s.ref
// CHECK:STDOUT: %.loc11_19.2: ref %S = value_as_ref %.loc11_19.1
// CHECK:STDOUT: %addr.loc11: %ptr.5c7 = addr_of %.loc11_19.2
// CHECK:STDOUT: %.loc11_20.1: %ptr.ff5 = as_compatible %addr.loc11
// CHECK:STDOUT: %.loc11_20.2: %ptr.ff5 = converted %addr.loc11, %.loc11_20.1
// CHECK:STDOUT: %TakesConstS__carbon_thunk.call: init %empty_tuple.type = call imports.%TakesConstS__carbon_thunk.decl(%.loc11_20.2)
// CHECK:STDOUT: %facet_value: %type_where = facet_value constants.%S, () [concrete = constants.%facet_value]
// CHECK:STDOUT: %.loc10_3.2: %type_where = converted constants.%S, %facet_value [concrete = constants.%facet_value]
// CHECK:STDOUT: %AggregateT.as_type.as.Destroy.impl.Op.bound: <bound method> = bound_method %s.var, constants.%AggregateT.as_type.as.Destroy.impl.Op.cc2
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %bound_method.loc10: <bound method> = bound_method %s.var, %AggregateT.as_type.as.Destroy.impl.Op.specific_fn
// CHECK:STDOUT: %addr.loc10: %ptr.5c7 = addr_of %s.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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