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carbon-lang/toolchain/check/testdata/if_expr/struct.carbon
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Richard Smith 5b884ae14d Improve lowering for global variables. (#5492) 
- Track the `VarPattern` instruction on the `VarStorage` instruction so
that it's available for name mangling.
- Mangle global variables based on the first binding name within their
pattern.
- Give global variables external rather than internal linkage, except if
they have no bindings whatsoever in their pattern.
- To support lowering references to bindings nested within a global var,
such as for `var (x: i32, b: i32)`, add some basic initial support for
reference constant expressions. Treat a global `var` as a reference
constant, and treat an aggregate access into a reference constant as a
reference constant.
2025-05-21 00:09:10 +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
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/if_expr/struct.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/if_expr/struct.carbon
fn G(s: {.a: i32, .b: i32});
fn F(cond: bool) {
var a: {.a: i32, .b: i32} = {.a = 1, .b = 2};
G(if cond then a else a);
}
// CHECK:STDOUT: --- struct.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: %struct_type.a.b.501: type = struct_type {.a: %i32, .b: %i32} [concrete]
// CHECK:STDOUT: %pattern_type.851: type = pattern_type %struct_type.a.b.501 [concrete]
// CHECK:STDOUT: %G.type: type = fn_type @G [concrete]
// CHECK:STDOUT: %G: %G.type = struct_value () [concrete]
// CHECK:STDOUT: %Bool.type: type = fn_type @Bool [concrete]
// CHECK:STDOUT: %Bool: %Bool.type = struct_value () [concrete]
// CHECK:STDOUT: %pattern_type.831: type = pattern_type bool [concrete]
// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
// CHECK:STDOUT: %int_1.5b8: Core.IntLiteral = int_value 1 [concrete]
// CHECK:STDOUT: %int_2.ecc: Core.IntLiteral = int_value 2 [concrete]
// CHECK:STDOUT: %struct_type.a.b.cfd: type = struct_type {.a: Core.IntLiteral, .b: Core.IntLiteral} [concrete]
// CHECK:STDOUT: %ImplicitAs.type.cc7: type = generic_interface_type @ImplicitAs [concrete]
// CHECK:STDOUT: %ImplicitAs.generic: %ImplicitAs.type.cc7 = struct_value () [concrete]
// CHECK:STDOUT: %ImplicitAs.type.205: type = facet_type <@ImplicitAs, @ImplicitAs(%i32)> [concrete]
// CHECK:STDOUT: %Convert.type.1b6: type = fn_type @Convert.1, @ImplicitAs(%i32) [concrete]
// CHECK:STDOUT: %To.c80: Core.IntLiteral = bind_symbolic_name To, 0 [symbolic]
// CHECK:STDOUT: %Convert.type.0f9: type = fn_type @Convert.2, @impl.4f9(%To.c80) [symbolic]
// CHECK:STDOUT: %Convert.f06: %Convert.type.0f9 = struct_value () [symbolic]
// CHECK:STDOUT: %ImplicitAs.impl_witness.c75: <witness> = impl_witness imports.%ImplicitAs.impl_witness_table.a2f, @impl.4f9(%int_32) [concrete]
// CHECK:STDOUT: %Convert.type.035: type = fn_type @Convert.2, @impl.4f9(%int_32) [concrete]
// CHECK:STDOUT: %Convert.956: %Convert.type.035 = struct_value () [concrete]
// CHECK:STDOUT: %ImplicitAs.facet: %ImplicitAs.type.205 = facet_value Core.IntLiteral, (%ImplicitAs.impl_witness.c75) [concrete]
// CHECK:STDOUT: %.9c3: type = fn_type_with_self_type %Convert.type.1b6, %ImplicitAs.facet [concrete]
// CHECK:STDOUT: %Convert.bound.ab5: <bound method> = bound_method %int_1.5b8, %Convert.956 [concrete]
// CHECK:STDOUT: %Convert.specific_fn: <specific function> = specific_function %Convert.956, @Convert.2(%int_32) [concrete]
// CHECK:STDOUT: %bound_method.9a1: <bound method> = bound_method %int_1.5b8, %Convert.specific_fn [concrete]
// CHECK:STDOUT: %int_1.5d2: %i32 = int_value 1 [concrete]
// CHECK:STDOUT: %Convert.bound.ef9: <bound method> = bound_method %int_2.ecc, %Convert.956 [concrete]
// CHECK:STDOUT: %bound_method.b92: <bound method> = bound_method %int_2.ecc, %Convert.specific_fn [concrete]
// CHECK:STDOUT: %int_2.ef8: %i32 = int_value 2 [concrete]
// CHECK:STDOUT: %struct: %struct_type.a.b.501 = struct_value (%int_1.5d2, %int_2.ef8) [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT: .Int = %Core.Int
// CHECK:STDOUT: .Bool = %Core.Bool
// CHECK:STDOUT: .ImplicitAs = %Core.ImplicitAs
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.Int: %Int.type = import_ref Core//prelude/types/int, Int, loaded [concrete = constants.%Int.generic]
// CHECK:STDOUT: %Core.Bool: %Bool.type = import_ref Core//prelude/types/bool, Bool, loaded [concrete = constants.%Bool]
// CHECK:STDOUT: %Core.ImplicitAs: %ImplicitAs.type.cc7 = import_ref Core//prelude/operators/as, ImplicitAs, loaded [concrete = constants.%ImplicitAs.generic]
// CHECK:STDOUT: %Core.import_ref.a5b: @impl.4f9.%Convert.type (%Convert.type.0f9) = import_ref Core//prelude/types/int, loc19_39, loaded [symbolic = @impl.4f9.%Convert (constants.%Convert.f06)]
// CHECK:STDOUT: %ImplicitAs.impl_witness_table.a2f = impl_witness_table (%Core.import_ref.a5b), @impl.4f9 [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .Core = imports.%Core
// CHECK:STDOUT: .G = %G.decl
// CHECK:STDOUT: .F = %F.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: %G.decl: %G.type = fn_decl @G [concrete = constants.%G] {
// CHECK:STDOUT: %s.patt: %pattern_type.851 = binding_pattern s [concrete]
// CHECK:STDOUT: %s.param_patt: %pattern_type.851 = value_param_pattern %s.patt, call_param0 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %s.param: %struct_type.a.b.501 = value_param call_param0
// CHECK:STDOUT: %.loc11: type = splice_block %struct_type.a.b [concrete = constants.%struct_type.a.b.501] {
// CHECK:STDOUT: %int_32.loc11_14: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
// CHECK:STDOUT: %i32.loc11_14: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
// CHECK:STDOUT: %int_32.loc11_23: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
// CHECK:STDOUT: %i32.loc11_23: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
// CHECK:STDOUT: %struct_type.a.b: type = struct_type {.a: %i32, .b: %i32} [concrete = constants.%struct_type.a.b.501]
// CHECK:STDOUT: }
// CHECK:STDOUT: %s: %struct_type.a.b.501 = bind_name s, %s.param
// CHECK:STDOUT: }
// CHECK:STDOUT: %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {
// CHECK:STDOUT: %cond.patt: %pattern_type.831 = binding_pattern cond [concrete]
// CHECK:STDOUT: %cond.param_patt: %pattern_type.831 = value_param_pattern %cond.patt, call_param0 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %cond.param: bool = value_param call_param0
// CHECK:STDOUT: %.loc13_12.1: type = splice_block %.loc13_12.3 [concrete = bool] {
// CHECK:STDOUT: %bool.make_type: init type = call constants.%Bool() [concrete = bool]
// CHECK:STDOUT: %.loc13_12.2: type = value_of_initializer %bool.make_type [concrete = bool]
// CHECK:STDOUT: %.loc13_12.3: type = converted %bool.make_type, %.loc13_12.2 [concrete = bool]
// CHECK:STDOUT: }
// CHECK:STDOUT: %cond: bool = bind_name cond, %cond.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @G(%s.param: %struct_type.a.b.501);
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F(%cond.param: bool) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %a.patt: %pattern_type.851 = binding_pattern a [concrete]
// CHECK:STDOUT: %a.var_patt: %pattern_type.851 = var_pattern %a.patt [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %a.var: ref %struct_type.a.b.501 = var %a.var_patt
// CHECK:STDOUT: %int_1: Core.IntLiteral = int_value 1 [concrete = constants.%int_1.5b8]
// CHECK:STDOUT: %int_2: Core.IntLiteral = int_value 2 [concrete = constants.%int_2.ecc]
// CHECK:STDOUT: %.loc14_46.1: %struct_type.a.b.cfd = struct_literal (%int_1, %int_2)
// CHECK:STDOUT: %impl.elem0.loc14_46.1: %.9c3 = impl_witness_access constants.%ImplicitAs.impl_witness.c75, element0 [concrete = constants.%Convert.956]
// CHECK:STDOUT: %bound_method.loc14_46.1: <bound method> = bound_method %int_1, %impl.elem0.loc14_46.1 [concrete = constants.%Convert.bound.ab5]
// CHECK:STDOUT: %specific_fn.loc14_46.1: <specific function> = specific_function %impl.elem0.loc14_46.1, @Convert.2(constants.%int_32) [concrete = constants.%Convert.specific_fn]
// CHECK:STDOUT: %bound_method.loc14_46.2: <bound method> = bound_method %int_1, %specific_fn.loc14_46.1 [concrete = constants.%bound_method.9a1]
// CHECK:STDOUT: %int.convert_checked.loc14_46.1: init %i32 = call %bound_method.loc14_46.2(%int_1) [concrete = constants.%int_1.5d2]
// CHECK:STDOUT: %.loc14_46.2: init %i32 = converted %int_1, %int.convert_checked.loc14_46.1 [concrete = constants.%int_1.5d2]
// CHECK:STDOUT: %.loc14_46.3: ref %i32 = struct_access %a.var, element0
// CHECK:STDOUT: %.loc14_46.4: init %i32 = initialize_from %.loc14_46.2 to %.loc14_46.3 [concrete = constants.%int_1.5d2]
// CHECK:STDOUT: %impl.elem0.loc14_46.2: %.9c3 = impl_witness_access constants.%ImplicitAs.impl_witness.c75, element0 [concrete = constants.%Convert.956]
// CHECK:STDOUT: %bound_method.loc14_46.3: <bound method> = bound_method %int_2, %impl.elem0.loc14_46.2 [concrete = constants.%Convert.bound.ef9]
// CHECK:STDOUT: %specific_fn.loc14_46.2: <specific function> = specific_function %impl.elem0.loc14_46.2, @Convert.2(constants.%int_32) [concrete = constants.%Convert.specific_fn]
// CHECK:STDOUT: %bound_method.loc14_46.4: <bound method> = bound_method %int_2, %specific_fn.loc14_46.2 [concrete = constants.%bound_method.b92]
// CHECK:STDOUT: %int.convert_checked.loc14_46.2: init %i32 = call %bound_method.loc14_46.4(%int_2) [concrete = constants.%int_2.ef8]
// CHECK:STDOUT: %.loc14_46.5: init %i32 = converted %int_2, %int.convert_checked.loc14_46.2 [concrete = constants.%int_2.ef8]
// CHECK:STDOUT: %.loc14_46.6: ref %i32 = struct_access %a.var, element1
// CHECK:STDOUT: %.loc14_46.7: init %i32 = initialize_from %.loc14_46.5 to %.loc14_46.6 [concrete = constants.%int_2.ef8]
// CHECK:STDOUT: %.loc14_46.8: init %struct_type.a.b.501 = struct_init (%.loc14_46.4, %.loc14_46.7) to %a.var [concrete = constants.%struct]
// CHECK:STDOUT: %.loc14_3: init %struct_type.a.b.501 = converted %.loc14_46.1, %.loc14_46.8 [concrete = constants.%struct]
// CHECK:STDOUT: assign %a.var, %.loc14_3
// CHECK:STDOUT: %.loc14_27: type = splice_block %struct_type.a.b [concrete = constants.%struct_type.a.b.501] {
// CHECK:STDOUT: %int_32.loc14_15: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
// CHECK:STDOUT: %i32.loc14_15: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
// CHECK:STDOUT: %int_32.loc14_24: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
// CHECK:STDOUT: %i32.loc14_24: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
// CHECK:STDOUT: %struct_type.a.b: type = struct_type {.a: %i32, .b: %i32} [concrete = constants.%struct_type.a.b.501]
// CHECK:STDOUT: }
// CHECK:STDOUT: %a: ref %struct_type.a.b.501 = bind_name a, %a.var
// CHECK:STDOUT: %G.ref: %G.type = name_ref G, file.%G.decl [concrete = constants.%G]
// CHECK:STDOUT: %cond.ref: bool = name_ref cond, %cond
// CHECK:STDOUT: if %cond.ref br !if.expr.then else br !if.expr.else
// CHECK:STDOUT:
// CHECK:STDOUT: !if.expr.then:
// CHECK:STDOUT: %a.ref.loc15_18: ref %struct_type.a.b.501 = name_ref a, %a
// CHECK:STDOUT: %.loc15_18.1: ref %i32 = struct_access %a.ref.loc15_18, element0
// CHECK:STDOUT: %.loc15_18.2: %i32 = bind_value %.loc15_18.1
// CHECK:STDOUT: %.loc15_18.3: ref %i32 = struct_access %a.ref.loc15_18, element1
// CHECK:STDOUT: %.loc15_18.4: %i32 = bind_value %.loc15_18.3
// CHECK:STDOUT: %struct.loc15_18: %struct_type.a.b.501 = struct_value (%.loc15_18.2, %.loc15_18.4)
// CHECK:STDOUT: %.loc15_18.5: %struct_type.a.b.501 = converted %a.ref.loc15_18, %struct.loc15_18
// CHECK:STDOUT: br !if.expr.result(%.loc15_18.5)
// CHECK:STDOUT:
// CHECK:STDOUT: !if.expr.else:
// CHECK:STDOUT: %a.ref.loc15_25: ref %struct_type.a.b.501 = name_ref a, %a
// CHECK:STDOUT: %.loc15_25.1: ref %i32 = struct_access %a.ref.loc15_25, element0
// CHECK:STDOUT: %.loc15_25.2: %i32 = bind_value %.loc15_25.1
// CHECK:STDOUT: %.loc15_25.3: ref %i32 = struct_access %a.ref.loc15_25, element1
// CHECK:STDOUT: %.loc15_25.4: %i32 = bind_value %.loc15_25.3
// CHECK:STDOUT: %struct.loc15_25: %struct_type.a.b.501 = struct_value (%.loc15_25.2, %.loc15_25.4)
// CHECK:STDOUT: %.loc15_20: %struct_type.a.b.501 = converted %a.ref.loc15_25, %struct.loc15_25
// CHECK:STDOUT: br !if.expr.result(%.loc15_20)
// CHECK:STDOUT:
// CHECK:STDOUT: !if.expr.result:
// CHECK:STDOUT: %.loc15_5: %struct_type.a.b.501 = block_arg !if.expr.result
// CHECK:STDOUT: %G.call: init %empty_tuple.type = call %G.ref(%.loc15_5)
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
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