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carbon-lang/toolchain/check/testdata/struct/member_access.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/struct/member_access.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/struct/member_access.carbon
var x: {.a: f64, .b: i32} = {.a = 0.0, .b = 1};
var y: i32 = x.b;
var z: i32 = y;
// CHECK:STDOUT: --- member_access.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %int_64: Core.IntLiteral = int_value 64 [concrete]
// CHECK:STDOUT: %Float.type: type = fn_type @Float [concrete]
// CHECK:STDOUT: %Float: %Float.type = struct_value () [concrete]
// CHECK:STDOUT: %int_32: Core.IntLiteral = int_value 32 [concrete]
// CHECK:STDOUT: %Int.type: type = generic_class_type @Int [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.ddf: type = struct_type {.a: f64, .b: %i32} [concrete]
// CHECK:STDOUT: %pattern_type.7fd: type = pattern_type %struct_type.a.b.ddf [concrete]
// CHECK:STDOUT: %float: f64 = float_literal 0 [concrete]
// CHECK:STDOUT: %int_1.5b8: Core.IntLiteral = int_value 1 [concrete]
// CHECK:STDOUT: %struct_type.a.b.fbb: type = struct_type {.a: f64, .b: Core.IntLiteral} [concrete]
// CHECK:STDOUT: %.984: ref f64 = struct_access file.%x.var, element0 [concrete]
// CHECK:STDOUT: %.865: ref %i32 = struct_access file.%x.var, element1 [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: <bound method> = bound_method %int_1.5b8, %Convert.956 [concrete]
// CHECK:STDOUT: %pattern_type.7ce: type = pattern_type %i32 [concrete]
// CHECK:STDOUT: %Convert.specific_fn: <specific function> = specific_function %Convert.956, @Convert.2(%int_32) [concrete]
// CHECK:STDOUT: %bound_method: <bound method> = bound_method %int_1.5b8, %Convert.specific_fn [concrete]
// CHECK:STDOUT: %int_1.5d2: %i32 = int_value 1 [concrete]
// CHECK:STDOUT: %struct: %struct_type.a.b.ddf = struct_value (%float, %int_1.5d2) [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT: .Float = %Core.Float
// CHECK:STDOUT: .Int = %Core.Int
// CHECK:STDOUT: .ImplicitAs = %Core.ImplicitAs
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.Float: %Float.type = import_ref Core//prelude/types, Float, loaded [concrete = constants.%Float]
// CHECK:STDOUT: %Core.Int: %Int.type = import_ref Core//prelude/types/int, Int, loaded [concrete = constants.%Int.generic]
// 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: .x = %x
// CHECK:STDOUT: .y = %y
// CHECK:STDOUT: .z = %z
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %x.patt: %pattern_type.7fd = binding_pattern x [concrete]
// CHECK:STDOUT: %x.var_patt: %pattern_type.7fd = var_pattern %x.patt [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %x.var: ref %struct_type.a.b.ddf = var %x.var_patt [concrete]
// CHECK:STDOUT: %.loc11_25: type = splice_block %struct_type.a.b [concrete = constants.%struct_type.a.b.ddf] {
// CHECK:STDOUT: %int_64: Core.IntLiteral = int_value 64 [concrete = constants.%int_64]
// CHECK:STDOUT: %float.make_type: init type = call constants.%Float(%int_64) [concrete = f64]
// CHECK:STDOUT: %.loc11_13.1: type = value_of_initializer %float.make_type [concrete = f64]
// CHECK:STDOUT: %.loc11_13.2: type = converted %float.make_type, %.loc11_13.1 [concrete = f64]
// CHECK:STDOUT: %int_32.loc11: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
// CHECK:STDOUT: %i32.loc11: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
// CHECK:STDOUT: %struct_type.a.b: type = struct_type {.a: f64, .b: %i32} [concrete = constants.%struct_type.a.b.ddf]
// CHECK:STDOUT: }
// CHECK:STDOUT: %x: ref %struct_type.a.b.ddf = bind_name x, %x.var
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %y.patt: %pattern_type.7ce = binding_pattern y [concrete]
// CHECK:STDOUT: %y.var_patt: %pattern_type.7ce = var_pattern %y.patt [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %y.var: ref %i32 = var %y.var_patt [concrete]
// CHECK:STDOUT: %.loc12: type = splice_block %i32.loc12 [concrete = constants.%i32] {
// CHECK:STDOUT: %int_32.loc12: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
// CHECK:STDOUT: %i32.loc12: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
// CHECK:STDOUT: }
// CHECK:STDOUT: %y: ref %i32 = bind_name y, %y.var
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %z.patt: %pattern_type.7ce = binding_pattern z [concrete]
// CHECK:STDOUT: %z.var_patt: %pattern_type.7ce = var_pattern %z.patt [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %z.var: ref %i32 = var %z.var_patt [concrete]
// CHECK:STDOUT: %.loc13: type = splice_block %i32.loc13 [concrete = constants.%i32] {
// CHECK:STDOUT: %int_32.loc13: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
// CHECK:STDOUT: %i32.loc13: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
// CHECK:STDOUT: }
// CHECK:STDOUT: %z: ref %i32 = bind_name z, %z.var
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @__global_init() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %float: f64 = float_literal 0 [concrete = constants.%float]
// CHECK:STDOUT: %int_1: Core.IntLiteral = int_value 1 [concrete = constants.%int_1.5b8]
// CHECK:STDOUT: %.loc11_46.1: %struct_type.a.b.fbb = struct_literal (%float, %int_1)
// CHECK:STDOUT: %.loc11_46.2: ref f64 = struct_access file.%x.var, element0 [concrete = constants.%.984]
// CHECK:STDOUT: %.loc11_46.3: init f64 = initialize_from %float to %.loc11_46.2 [concrete = constants.%float]
// CHECK:STDOUT: %impl.elem0: %.9c3 = impl_witness_access constants.%ImplicitAs.impl_witness.c75, element0 [concrete = constants.%Convert.956]
// CHECK:STDOUT: %bound_method.loc11_46.1: <bound method> = bound_method %int_1, %impl.elem0 [concrete = constants.%Convert.bound]
// CHECK:STDOUT: %specific_fn: <specific function> = specific_function %impl.elem0, @Convert.2(constants.%int_32) [concrete = constants.%Convert.specific_fn]
// CHECK:STDOUT: %bound_method.loc11_46.2: <bound method> = bound_method %int_1, %specific_fn [concrete = constants.%bound_method]
// CHECK:STDOUT: %int.convert_checked: init %i32 = call %bound_method.loc11_46.2(%int_1) [concrete = constants.%int_1.5d2]
// CHECK:STDOUT: %.loc11_46.4: init %i32 = converted %int_1, %int.convert_checked [concrete = constants.%int_1.5d2]
// CHECK:STDOUT: %.loc11_46.5: ref %i32 = struct_access file.%x.var, element1 [concrete = constants.%.865]
// CHECK:STDOUT: %.loc11_46.6: init %i32 = initialize_from %.loc11_46.4 to %.loc11_46.5 [concrete = constants.%int_1.5d2]
// CHECK:STDOUT: %.loc11_46.7: init %struct_type.a.b.ddf = struct_init (%.loc11_46.3, %.loc11_46.6) to file.%x.var [concrete = constants.%struct]
// CHECK:STDOUT: %.loc11_1: init %struct_type.a.b.ddf = converted %.loc11_46.1, %.loc11_46.7 [concrete = constants.%struct]
// CHECK:STDOUT: assign file.%x.var, %.loc11_1
// CHECK:STDOUT: %x.ref: ref %struct_type.a.b.ddf = name_ref x, file.%x
// CHECK:STDOUT: %.loc12_15.1: ref %i32 = struct_access %x.ref, element1
// CHECK:STDOUT: %.loc12_15.2: %i32 = bind_value %.loc12_15.1
// CHECK:STDOUT: assign file.%y.var, %.loc12_15.2
// CHECK:STDOUT: %y.ref: ref %i32 = name_ref y, file.%y
// CHECK:STDOUT: %.loc13: %i32 = bind_value %y.ref
// CHECK:STDOUT: assign file.%z.var, %.loc13
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
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