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carbon-lang/toolchain/check/testdata/interop/cpp/template/concept.carbon
T
Geoff RomerandRichard Smith e023f75254 Implement thunking in terms of constant evaluation (#7332) 
The bulk of this change is changing most pattern insts to be `Always`
rather than `AlwaysUnique` constants, so that they can be wrapped in
`SpecificConstant`s to perform substitution. That then lets thunking
rely much more on `SpecificConstant` wrappers instead of deep-copying
the inst tree with modified types.

This approach to thunking should scale better, particularly as things
like form generics make function signatures more complex, because we can
leverage the existing support for constant evaluation and substitution.
Unfortunately, applying this approach to binding patterns will require
more work; see the TODO near the top of `thunk.cpp` for details.

---------

Co-authored-by: Richard Smith <richard@metafoo.co.uk>
2026-06-13 00:22:00 +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/bool.carbon
// EXTRA-ARGS: --clang-arg=--std=c++20
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/interop/cpp/template/concept.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interop/cpp/template/concept.carbon
// --- concept.h
struct Small {};
struct Large { int n; };
template<typename T> concept IsLarge = sizeof(T) > 1;
// --- use_concept.carbon
library "[[@TEST_NAME]]";
import Cpp library "concept.h";
class X(B:! bool) {
fn Make() -> Self { return {}; }
}
//@dump-sem-ir-begin
var x1: X(Cpp.IsLarge(Cpp.Small)) = X(false).Make();
var x2: X(Cpp.IsLarge(Cpp.Large)) = X(true).Make();
//@dump-sem-ir-end
// CHECK:STDOUT: --- use_concept.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %X.type: type = generic_class_type @X [concrete]
// CHECK:STDOUT: %X.generic: %X.type = struct_value () [concrete]
// CHECK:STDOUT: %IsLarge.type: type = cpp_type_template_type IsLarge [concrete]
// CHECK:STDOUT: %IsLarge.template: %IsLarge.type = struct_value () [concrete]
// CHECK:STDOUT: %Small: type = class_type @Small [concrete]
// CHECK:STDOUT: %false: bool = bool_literal false [concrete]
// CHECK:STDOUT: %X.541: type = class_type @X, @X(%false) [concrete]
// CHECK:STDOUT: %X.Make.type.243: type = fn_type @X.Make, @X(%false) [concrete]
// CHECK:STDOUT: %X.Make.d05: %X.Make.type.243 = struct_value () [concrete]
// CHECK:STDOUT: %pattern_type.26c: type = pattern_type %X.541 [concrete]
// CHECK:STDOUT: %x1.patt: %pattern_type.26c = ref_binding_pattern x1 [concrete]
// CHECK:STDOUT: %x1.var_patt: %pattern_type.26c = var_pattern %x1.patt [concrete]
// CHECK:STDOUT: %X.Make.specific_fn.932: <specific function> = specific_function %X.Make.d05, @X.Make(%false) [concrete]
// CHECK:STDOUT: %Large: type = class_type @Large [concrete]
// CHECK:STDOUT: %true: bool = bool_literal true [concrete]
// CHECK:STDOUT: %X.7b4: type = class_type @X, @X(%true) [concrete]
// CHECK:STDOUT: %X.Make.type.4b0: type = fn_type @X.Make, @X(%true) [concrete]
// CHECK:STDOUT: %X.Make.42d: %X.Make.type.4b0 = struct_value () [concrete]
// CHECK:STDOUT: %pattern_type.795: type = pattern_type %X.7b4 [concrete]
// CHECK:STDOUT: %x2.patt: %pattern_type.795 = ref_binding_pattern x2 [concrete]
// CHECK:STDOUT: %x2.var_patt: %pattern_type.795 = var_pattern %x2.patt [concrete]
// CHECK:STDOUT: %X.Make.specific_fn.8a7: <specific function> = specific_function %X.Make.42d, @X.Make(%true) [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .IsLarge = %IsLarge.template
// CHECK:STDOUT: .Small = %Small.decl
// CHECK:STDOUT: .Large = %Large.decl
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %IsLarge.template: %IsLarge.type = struct_value () [concrete = constants.%IsLarge.template]
// CHECK:STDOUT: %Small.decl: type = class_decl @Small [concrete = constants.%Small] {} {}
// CHECK:STDOUT: %Large.decl: type = class_decl @Large [concrete = constants.%Large] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %x1.patt: %pattern_type.26c = ref_binding_pattern x1 [concrete = constants.%x1.patt]
// CHECK:STDOUT: %x1.var_patt: %pattern_type.26c = var_pattern %x1.patt [concrete = constants.%x1.var_patt]
// CHECK:STDOUT: }
// CHECK:STDOUT: %x1.var: ref %X.541 = var %x1.var_patt [concrete]
// CHECK:STDOUT: %.loc11: type = splice_block %X.loc11 [concrete = constants.%X.541] {
// CHECK:STDOUT: %X.ref.loc11: %X.type = name_ref X, %X.decl [concrete = constants.%X.generic]
// CHECK:STDOUT: %Cpp.ref.loc11_11: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %IsLarge.ref.loc11: %IsLarge.type = name_ref IsLarge, imports.%IsLarge.template [concrete = constants.%IsLarge.template]
// CHECK:STDOUT: %Cpp.ref.loc11_23: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Small.ref: type = name_ref Small, imports.%Small.decl [concrete = constants.%Small]
// CHECK:STDOUT: %false: bool = bool_literal false [concrete = constants.%false]
// CHECK:STDOUT: %X.loc11: type = class_type @X, @X(constants.%false) [concrete = constants.%X.541]
// CHECK:STDOUT: }
// CHECK:STDOUT: %x1: ref %X.541 = ref_binding x1, %x1.var [concrete = %x1.var]
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %x2.patt: %pattern_type.795 = ref_binding_pattern x2 [concrete = constants.%x2.patt]
// CHECK:STDOUT: %x2.var_patt: %pattern_type.795 = var_pattern %x2.patt [concrete = constants.%x2.var_patt]
// CHECK:STDOUT: }
// CHECK:STDOUT: %x2.var: ref %X.7b4 = var %x2.var_patt [concrete]
// CHECK:STDOUT: %.loc12: type = splice_block %X.loc12 [concrete = constants.%X.7b4] {
// CHECK:STDOUT: %X.ref.loc12: %X.type = name_ref X, %X.decl [concrete = constants.%X.generic]
// CHECK:STDOUT: %Cpp.ref.loc12_11: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %IsLarge.ref.loc12: %IsLarge.type = name_ref IsLarge, imports.%IsLarge.template [concrete = constants.%IsLarge.template]
// CHECK:STDOUT: %Cpp.ref.loc12_23: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Large.ref: type = name_ref Large, imports.%Large.decl [concrete = constants.%Large]
// CHECK:STDOUT: %true: bool = bool_literal true [concrete = constants.%true]
// CHECK:STDOUT: %X.loc12: type = class_type @X, @X(constants.%true) [concrete = constants.%X.7b4]
// CHECK:STDOUT: }
// CHECK:STDOUT: %x2: ref %X.7b4 = ref_binding x2, %x2.var [concrete = %x2.var]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @__global_init() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %X.ref.loc11: %X.type = name_ref X, file.%X.decl [concrete = constants.%X.generic]
// CHECK:STDOUT: %false: bool = bool_literal false [concrete = constants.%false]
// CHECK:STDOUT: %X.loc11: type = class_type @X, @X(constants.%false) [concrete = constants.%X.541]
// CHECK:STDOUT: %.loc11_45: %X.Make.type.243 = specific_constant @X.%X.Make.decl, @X(constants.%false) [concrete = constants.%X.Make.d05]
// CHECK:STDOUT: %Make.ref.loc11: %X.Make.type.243 = name_ref Make, %.loc11_45 [concrete = constants.%X.Make.d05]
// CHECK:STDOUT: %X.Make.specific_fn.loc11: <specific function> = specific_function %Make.ref.loc11, @X.Make(constants.%false) [concrete = constants.%X.Make.specific_fn.932]
// CHECK:STDOUT: %.loc11_1: ref %X.541 = splice_block file.%x1.var [concrete = file.%x1.var] {}
// CHECK:STDOUT: %X.Make.call.loc11: init %X.541 to %.loc11_1 = call %X.Make.specific_fn.loc11()
// CHECK:STDOUT: assign file.%x1.var, %X.Make.call.loc11
// CHECK:STDOUT: %X.ref.loc12: %X.type = name_ref X, file.%X.decl [concrete = constants.%X.generic]
// CHECK:STDOUT: %true: bool = bool_literal true [concrete = constants.%true]
// CHECK:STDOUT: %X.loc12: type = class_type @X, @X(constants.%true) [concrete = constants.%X.7b4]
// CHECK:STDOUT: %.loc12_44: %X.Make.type.4b0 = specific_constant @X.%X.Make.decl, @X(constants.%true) [concrete = constants.%X.Make.42d]
// CHECK:STDOUT: %Make.ref.loc12: %X.Make.type.4b0 = name_ref Make, %.loc12_44 [concrete = constants.%X.Make.42d]
// CHECK:STDOUT: %X.Make.specific_fn.loc12: <specific function> = specific_function %Make.ref.loc12, @X.Make(constants.%true) [concrete = constants.%X.Make.specific_fn.8a7]
// CHECK:STDOUT: %.loc12_1: ref %X.7b4 = splice_block file.%x2.var [concrete = file.%x2.var] {}
// CHECK:STDOUT: %X.Make.call.loc12: init %X.7b4 to %.loc12_1 = call %X.Make.specific_fn.loc12()
// CHECK:STDOUT: assign file.%x2.var, %X.Make.call.loc12
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
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