mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 21:50:14 +01:00
Geoff RomerandChandler Carruth
49c7288619
- A function with a return declaration always has exactly one `ReturnSlotPattern`, representing the whole return declaration (whereas previously that was omitted for value and reference returns). - The `ReturnSlotPattern` always has a subpattern with the same form. `OutParamPattern` already plays that role for initializing forms, and `TuplePattern` will play that role for tuple forms. This change introduces `ValueReturnPattern` and `RefReturnPattern` to represent value and reference return forms. - As before, the `ReturnSlotPattern` has a corresponding `ReturnSlot` that represents the output that is initialized by a `return` statement. Its structure parallels the structure of the `ReturnSlotPattern`, so we need `ValueReturn` and `RefReturn` insts that correspond to `ValueReturnPattern` and `RefReturnPattern`. This is a step toward supporting generic return forms, where the `ReturnSlotPattern`'s subpattern may be an action: this change ensures that evaluating the action for a specific form produces the same SemIR as if the form were concrete to begin with. More speculatively, this should simplify the implementation of `return` statements with compound return forms. --------- Co-authored-by: Chandler Carruth <chandlerc@gmail.com>
82 lines
3.5 KiB
Plaintext
82 lines
3.5 KiB
Plaintext
// 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
|
|
// EXTRA-ARGS: --dump-sem-ir-ranges=only
|
|
//
|
|
// AUTOUPDATE
|
|
// TIP: To test this file alone, run:
|
|
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/function/declaration/ref.carbon
|
|
// TIP: To dump output, run:
|
|
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/function/declaration/ref.carbon
|
|
|
|
// --- ref_return.carbon
|
|
|
|
//@include-in-dumps
|
|
|
|
fn F() -> ref i32;
|
|
|
|
fn G() {
|
|
let unused ref x: i32 = F();
|
|
}
|
|
|
|
// CHECK:STDOUT: --- ref_return.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: %Int.generic: %Int.type = struct_value () [concrete]
|
|
// CHECK:STDOUT: %i32: type = class_type @Int, @Int(%int_32) [concrete]
|
|
// CHECK:STDOUT: %.1da: Core.Form = ref_form %i32 [concrete]
|
|
// CHECK:STDOUT: %pattern_type.7ce: type = pattern_type %i32 [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: }
|
|
// CHECK:STDOUT:
|
|
// CHECK:STDOUT: imports {
|
|
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [concrete] {
|
|
// CHECK:STDOUT: .Int = %Core.Int
|
|
// 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: }
|
|
// 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: %.loc4_8.1: %pattern_type.7ce = ref_return_pattern [concrete]
|
|
// CHECK:STDOUT: %return.patt: %pattern_type.7ce = return_slot_pattern %.loc4_8.1, %i32 [concrete]
|
|
// CHECK:STDOUT: } {
|
|
// CHECK:STDOUT: %i32: type = type_literal constants.%i32 [concrete = constants.%i32]
|
|
// CHECK:STDOUT: %.loc4_11.1: type = ref_tag %i32
|
|
// CHECK:STDOUT: %.loc4_11.2: Core.Form = ref_form %i32 [concrete = constants.%.1da]
|
|
// CHECK:STDOUT: %.loc4_8.2: ref %i32 = ref_return
|
|
// CHECK:STDOUT: %return: ref %i32 = return_slot %.loc4_8.2
|
|
// CHECK:STDOUT: }
|
|
// CHECK:STDOUT: %G.decl: %G.type = fn_decl @G [concrete = constants.%G] {} {}
|
|
// CHECK:STDOUT: }
|
|
// CHECK:STDOUT:
|
|
// CHECK:STDOUT: fn @F() -> ref %i32;
|
|
// CHECK:STDOUT:
|
|
// CHECK:STDOUT: fn @G() {
|
|
// CHECK:STDOUT: !entry:
|
|
// CHECK:STDOUT: name_binding_decl {
|
|
// CHECK:STDOUT: %x.patt: %pattern_type.7ce = ref_binding_pattern x [concrete]
|
|
// CHECK:STDOUT: }
|
|
// CHECK:STDOUT: %F.ref: %F.type = name_ref F, file.%F.decl [concrete = constants.%F]
|
|
// CHECK:STDOUT: %F.call: ref %i32 = call %F.ref()
|
|
// CHECK:STDOUT: %i32: type = type_literal constants.%i32 [concrete = constants.%i32]
|
|
// CHECK:STDOUT: %x: ref %i32 = ref_binding x, %F.call
|
|
// CHECK:STDOUT: return
|
|
// CHECK:STDOUT: }
|
|
// CHECK:STDOUT:
|