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carbon-lang/toolchain/check/testdata/struct/nested_struct_in_place.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/int.carbon
// TODO: Add ranges and switch to "--dump-sem-ir-ranges=only".
// EXTRA-ARGS: --dump-sem-ir-ranges=if-present
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/struct/nested_struct_in_place.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/struct/nested_struct_in_place.carbon
fn F() -> (i32, i32, i32);
fn G() {
var unused v: {.a: (i32, i32, i32), .b: (i32, i32, i32)} = {.a = F(), .b = F()};
}
// CHECK:STDOUT: --- nested_struct_in_place.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %int_32: Core.IntLiteral = int_value 32 [concrete]
// CHECK:STDOUT: %Int.type: type = generic_class_type @Int [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %Int.generic: %Int.type = struct_value () [concrete]
// CHECK:STDOUT: %i32: type = class_type @Int, @Int(%int_32) [concrete]
// CHECK:STDOUT: %tuple.type.ff9: type = tuple_type (type, type, type) [concrete]
// CHECK:STDOUT: %tuple: %tuple.type.ff9 = tuple_value (%i32, %i32, %i32) [concrete]
// CHECK:STDOUT: %tuple.type.555: type = tuple_type (%i32, %i32, %i32) [concrete]
// CHECK:STDOUT: %.718: Core.Form = init_form %tuple.type.555 [concrete]
// CHECK:STDOUT: %pattern_type.777: type = pattern_type %tuple.type.555 [concrete]
// CHECK:STDOUT: %return.param_patt: %pattern_type.777 = out_param_pattern [concrete]
// CHECK:STDOUT: %return.patt: %pattern_type.777 = return_slot_pattern %return.param_patt, %tuple.type.555 [concrete]
// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
// CHECK:STDOUT: %G.type: type = fn_type @G [concrete]
// CHECK:STDOUT: %G: %G.type = struct_value () [concrete]
// CHECK:STDOUT: %struct_type.a.b.2a0: type = struct_type {.a: %tuple.type.555, .b: %tuple.type.555} [concrete]
// CHECK:STDOUT: %i32.builtin: type = int_type signed, %int_32 [concrete]
// CHECK:STDOUT: %pattern_type.28f: type = pattern_type %struct_type.a.b.2a0 [concrete]
// CHECK:STDOUT: %v.patt: %pattern_type.28f = ref_binding_pattern v [concrete]
// CHECK:STDOUT: %v.var_patt: %pattern_type.28f = var_pattern %v.patt [concrete]
// CHECK:STDOUT: %Destroy.type: type = facet_type <@Destroy> [concrete]
// CHECK:STDOUT: %Destroy.Op.type.1d8f74.4: type = fn_type @Destroy.Op.loc18_3.4 [concrete]
// CHECK:STDOUT: %Destroy.Op.1a2547.4: %Destroy.Op.type.1d8f74.4 = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT: .Int = %Core.Int
// CHECK:STDOUT: .Destroy = %Core.Destroy
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.Int: %Int.type = import_ref Core//prelude/parts/int, Int, loaded [concrete = constants.%Int.generic]
// CHECK:STDOUT: %Core.Destroy: type = import_ref Core//prelude/parts/destroy, Destroy, loaded [concrete = constants.%Destroy.type]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .Core = imports.%Core
// CHECK:STDOUT: .F = %F.decl
// CHECK:STDOUT: .G = %G.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {
// CHECK:STDOUT: %return.param_patt: %pattern_type.777 = out_param_pattern [concrete = constants.%return.param_patt]
// CHECK:STDOUT: %return.patt: %pattern_type.777 = return_slot_pattern %return.param_patt, %.loc15_25.2 [concrete = constants.%return.patt]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %i32.loc15_12: type = type_literal constants.%i32 [concrete = constants.%i32]
// CHECK:STDOUT: %i32.loc15_17: type = type_literal constants.%i32 [concrete = constants.%i32]
// CHECK:STDOUT: %i32.loc15_22: type = type_literal constants.%i32 [concrete = constants.%i32]
// CHECK:STDOUT: %.loc15_25.1: %tuple.type.ff9 = tuple_literal (%i32.loc15_12, %i32.loc15_17, %i32.loc15_22) [concrete = constants.%tuple]
// CHECK:STDOUT: %.loc15_25.2: type = converted %.loc15_25.1, constants.%tuple.type.555 [concrete = constants.%tuple.type.555]
// CHECK:STDOUT: %.loc15_25.3: Core.Form = init_form %.loc15_25.2 [concrete = constants.%.718]
// CHECK:STDOUT: %return.param: ref %tuple.type.555 = out_param call_param0
// CHECK:STDOUT: %return: ref %tuple.type.555 = return_slot %return.param
// CHECK:STDOUT: }
// CHECK:STDOUT: %G.decl: %G.type = fn_decl @G [concrete = constants.%G] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F() -> out %return.param: %tuple.type.555;
// CHECK:STDOUT:
// CHECK:STDOUT: fn @G() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %v.patt: %pattern_type.28f = ref_binding_pattern v [concrete = constants.%v.patt]
// CHECK:STDOUT: %v.var_patt: %pattern_type.28f = var_pattern %v.patt [concrete = constants.%v.var_patt]
// CHECK:STDOUT: }
// CHECK:STDOUT: %v.var: ref %struct_type.a.b.2a0 = var %v.var_patt
// CHECK:STDOUT: %F.ref.loc18_68: %F.type = name_ref F, file.%F.decl [concrete = constants.%F]
// CHECK:STDOUT: %.loc18_81.1: ref %tuple.type.555 = struct_access %v.var, element0
// CHECK:STDOUT: %F.call.loc18_70: init %tuple.type.555 to %.loc18_81.1 = call %F.ref.loc18_68()
// CHECK:STDOUT: %F.ref.loc18_78: %F.type = name_ref F, file.%F.decl [concrete = constants.%F]
// CHECK:STDOUT: %.loc18_81.2: ref %tuple.type.555 = struct_access %v.var, element1
// CHECK:STDOUT: %F.call.loc18_80: init %tuple.type.555 to %.loc18_81.2 = call %F.ref.loc18_78()
// CHECK:STDOUT: %.loc18_81.3: %struct_type.a.b.2a0 = struct_literal (%F.call.loc18_70, %F.call.loc18_80)
// CHECK:STDOUT: %.loc18_81.4: init %struct_type.a.b.2a0 to %v.var = struct_init (%F.call.loc18_70, %F.call.loc18_80)
// CHECK:STDOUT: %.loc18_3: init %struct_type.a.b.2a0 = converted %.loc18_81.3, %.loc18_81.4
// CHECK:STDOUT: assign %v.var, %.loc18_3
// CHECK:STDOUT: %.loc18_58: type = splice_block %struct_type.a.b [concrete = constants.%struct_type.a.b.2a0] {
// CHECK:STDOUT: %i32.loc18_23: type = type_literal constants.%i32 [concrete = constants.%i32]
// CHECK:STDOUT: %i32.loc18_28: type = type_literal constants.%i32 [concrete = constants.%i32]
// CHECK:STDOUT: %i32.loc18_33: type = type_literal constants.%i32 [concrete = constants.%i32]
// CHECK:STDOUT: %.loc18_36.1: %tuple.type.ff9 = tuple_literal (%i32.loc18_23, %i32.loc18_28, %i32.loc18_33) [concrete = constants.%tuple]
// CHECK:STDOUT: %.loc18_36.2: type = converted %.loc18_36.1, constants.%tuple.type.555 [concrete = constants.%tuple.type.555]
// CHECK:STDOUT: %i32.loc18_44: type = type_literal constants.%i32 [concrete = constants.%i32]
// CHECK:STDOUT: %i32.loc18_49: type = type_literal constants.%i32 [concrete = constants.%i32]
// CHECK:STDOUT: %i32.loc18_54: type = type_literal constants.%i32 [concrete = constants.%i32]
// CHECK:STDOUT: %.loc18_57.1: %tuple.type.ff9 = tuple_literal (%i32.loc18_44, %i32.loc18_49, %i32.loc18_54) [concrete = constants.%tuple]
// CHECK:STDOUT: %.loc18_57.2: type = converted %.loc18_57.1, constants.%tuple.type.555 [concrete = constants.%tuple.type.555]
// CHECK:STDOUT: %struct_type.a.b: type = struct_type {.a: %tuple.type.555, .b: %tuple.type.555} [concrete = constants.%struct_type.a.b.2a0]
// CHECK:STDOUT: }
// CHECK:STDOUT: %v: ref %struct_type.a.b.2a0 = ref_binding v, %v.var
// CHECK:STDOUT: %Destroy.Op.bound: <bound method> = bound_method %v.var, constants.%Destroy.Op.1a2547.4
// CHECK:STDOUT: %Destroy.Op.call: init %empty_tuple.type = call %Destroy.Op.bound(%v.var)
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Destroy.Op.loc18_3.1(%self.param: ref %i32.builtin) = "no_op";
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Destroy.Op.loc18_3.2(%self.param: ref %i32) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Destroy.Op.loc18_3.3(%self.param: ref %tuple.type.555) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Destroy.Op.loc18_3.4(%self.param: ref %struct_type.a.b.2a0) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
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