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f7cd39428ea016a4189972625eb578059eb39706
carbon-lang/toolchain/check/testdata/if/lifetime.carbon
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Christopher Di Bella f7cd39428e Add Destroy.SubobjectDestroy as a temporary replacement for Destroy.Op (#7773) 
This change partially implements [PR #7362], which revises how objects
are destroyed. It is a partial implementation for two reasons:

1. This change moves `Destroy.Op`'s current behaviour into
`Destroy.SubobjectDestroy`, but it doesn't add support for objects with
non-trivial destruction.
2. `Destroy.SubobjectDestroy` is a workaround for `require impls
SubobjectDestroy`. We aren't able to use the latter until the dependents
add their requirements' implementations to their own witness tables.

[PR #7362]: https://github.com/carbon-language/carbon-lang/pulls/7362
2026-09-24 00:06:28 +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
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/if/lifetime.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/if/lifetime.carbon
// --- condition_lifetime.carbon
library "[[@TEST_NAME]]";
class A {
fn F() -> bool;
}
fn Make() -> A;
fn G();
fn F() {
//@dump-sem-ir-begin
// The temporary A object is destroyed before the branch.
if (Make().F()) {
G();
}
//@dump-sem-ir-end
}
// CHECK:STDOUT: --- condition_lifetime.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %A: type = class_type @A [concrete]
// CHECK:STDOUT: %A.F.type: type = fn_type @A.F [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %A.F: %A.F.type = struct_value () [concrete]
// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
// CHECK:STDOUT: %pattern_type.9ef: type = pattern_type %A [concrete]
// CHECK:STDOUT: %Make.type: type = fn_type @Make [concrete]
// CHECK:STDOUT: %Make: %Make.type = struct_value () [concrete]
// CHECK:STDOUT: %G.type: type = fn_type @G [concrete]
// CHECK:STDOUT: %G: %G.type = struct_value () [concrete]
// CHECK:STDOUT: %pattern_type.a96: type = pattern_type %empty_struct_type [concrete]
// CHECK:STDOUT: %self.param_patt.52f: %pattern_type.a96 = ref_param_pattern [concrete]
// CHECK:STDOUT: %self.patt.4b1: %pattern_type.a96 = wrapper_binding_pattern self, %self.param_patt.52f [concrete]
// CHECK:STDOUT: %Destroy.WithSelf.SubobjectDestroy.type.dfcbdb.1: type = fn_type @Destroy.WithSelf.SubobjectDestroy.loc14_12.1 [concrete]
// CHECK:STDOUT: %Destroy.WithSelf.SubobjectDestroy.d01daf.1: %Destroy.WithSelf.SubobjectDestroy.type.dfcbdb.1 = struct_value () [concrete]
// CHECK:STDOUT: %Destroy.WithSelf.Op.type.ef016f.1: type = fn_type @Destroy.WithSelf.Op.loc14_12.1 [concrete]
// CHECK:STDOUT: %Destroy.WithSelf.Op.403171.1: %Destroy.WithSelf.Op.type.ef016f.1 = struct_value () [concrete]
// CHECK:STDOUT: %self.param_patt.8fb: %pattern_type.9ef = ref_param_pattern [concrete]
// CHECK:STDOUT: %self.patt.e64: %pattern_type.9ef = wrapper_binding_pattern self, %self.param_patt.8fb [concrete]
// CHECK:STDOUT: %Destroy.WithSelf.SubobjectDestroy.type.dfcbdb.2: type = fn_type @Destroy.WithSelf.SubobjectDestroy.loc14_12.2 [concrete]
// CHECK:STDOUT: %Destroy.WithSelf.SubobjectDestroy.d01daf.2: %Destroy.WithSelf.SubobjectDestroy.type.dfcbdb.2 = struct_value () [concrete]
// CHECK:STDOUT: %Destroy.WithSelf.Op.type.ef016f.2: type = fn_type @Destroy.WithSelf.Op.loc14_12.2 [concrete]
// CHECK:STDOUT: %Destroy.WithSelf.Op.403171.2: %Destroy.WithSelf.Op.type.ef016f.2 = struct_value () [concrete]
// CHECK:STDOUT: %Destroy.WithSelf.SelfDestruct.type.fbceb5.2: type = fn_type @Destroy.WithSelf.SelfDestruct.loc14_12.2 [concrete]
// CHECK:STDOUT: %Destroy.WithSelf.SelfDestruct.db3fdb.2: %Destroy.WithSelf.SelfDestruct.type.fbceb5.2 = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generated {
// CHECK:STDOUT: %Destroy.WithSelf.SubobjectDestroy.decl.763c71.1: %Destroy.WithSelf.SubobjectDestroy.type.dfcbdb.1 = fn_decl @Destroy.WithSelf.SubobjectDestroy.loc14_12.1 [concrete = constants.%Destroy.WithSelf.SubobjectDestroy.d01daf.1] {
// CHECK:STDOUT: %self.param_patt: %pattern_type.a96 = ref_param_pattern [concrete = constants.%self.param_patt.52f]
// CHECK:STDOUT: %self.patt: %pattern_type.a96 = wrapper_binding_pattern self, %self.param_patt [concrete = constants.%self.patt.4b1]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %self.param: ref %empty_struct_type = ref_param call_param0
// CHECK:STDOUT: %self: ref %empty_struct_type = wrapper_binding self, %self.param
// CHECK:STDOUT: }
// CHECK:STDOUT: %Destroy.WithSelf.Op.decl.5f94cf.1: %Destroy.WithSelf.Op.type.ef016f.1 = fn_decl @Destroy.WithSelf.Op.loc14_12.1 [concrete = constants.%Destroy.WithSelf.Op.403171.1] {
// CHECK:STDOUT: %self.param_patt: %pattern_type.a96 = ref_param_pattern [concrete = constants.%self.param_patt.52f]
// CHECK:STDOUT: %self.patt: %pattern_type.a96 = wrapper_binding_pattern self, %self.param_patt [concrete = constants.%self.patt.4b1]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %self.param: ref %empty_struct_type = ref_param call_param0
// CHECK:STDOUT: %self: ref %empty_struct_type = wrapper_binding self, %self.param
// CHECK:STDOUT: }
// CHECK:STDOUT: %Destroy.WithSelf.SubobjectDestroy.decl.763c71.2: %Destroy.WithSelf.SubobjectDestroy.type.dfcbdb.2 = fn_decl @Destroy.WithSelf.SubobjectDestroy.loc14_12.2 [concrete = constants.%Destroy.WithSelf.SubobjectDestroy.d01daf.2] {
// CHECK:STDOUT: %self.param_patt: %pattern_type.9ef = ref_param_pattern [concrete = constants.%self.param_patt.8fb]
// CHECK:STDOUT: %self.patt: %pattern_type.9ef = wrapper_binding_pattern self, %self.param_patt [concrete = constants.%self.patt.e64]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %self.param: ref %A = ref_param call_param0
// CHECK:STDOUT: %self: ref %A = wrapper_binding self, %self.param
// CHECK:STDOUT: }
// CHECK:STDOUT: %Destroy.WithSelf.Op.decl.5f94cf.2: %Destroy.WithSelf.Op.type.ef016f.2 = fn_decl @Destroy.WithSelf.Op.loc14_12.2 [concrete = constants.%Destroy.WithSelf.Op.403171.2] {
// CHECK:STDOUT: %self.param_patt: %pattern_type.9ef = ref_param_pattern [concrete = constants.%self.param_patt.8fb]
// CHECK:STDOUT: %self.patt: %pattern_type.9ef = wrapper_binding_pattern self, %self.param_patt [concrete = constants.%self.patt.e64]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %self.param: ref %A = ref_param call_param0
// CHECK:STDOUT: %self: ref %A = wrapper_binding self, %self.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %Make.ref: %Make.type = name_ref Make, file.%Make.decl [concrete = constants.%Make]
// CHECK:STDOUT: %.loc14_12.1: ref %A = temporary_storage
// CHECK:STDOUT: %Make.call: init %A to %.loc14_12.1 = call %Make.ref()
// CHECK:STDOUT: %.loc14_12.2: ref %A = temporary %.loc14_12.1, %Make.call
// CHECK:STDOUT: %F.ref: %A.F.type = name_ref F, @A.%A.F.decl [concrete = constants.%A.F]
// CHECK:STDOUT: %A.F.call: init bool = call %F.ref()
// CHECK:STDOUT: %.loc14_17.1: bool = value_of_initializer %A.F.call
// CHECK:STDOUT: %.loc14_17.2: bool = converted %A.F.call, %.loc14_17.1
// CHECK:STDOUT: %Destroy.WithSelf.SelfDestruct.bound: <bound method> = bound_method %.loc14_12.2, constants.%Destroy.WithSelf.SelfDestruct.db3fdb.2
// CHECK:STDOUT: %Destroy.WithSelf.SelfDestruct.call: init %empty_tuple.type = call %Destroy.WithSelf.SelfDestruct.bound(%.loc14_12.2)
// CHECK:STDOUT: if %.loc14_17.2 br !if.then else br !if.else
// CHECK:STDOUT:
// CHECK:STDOUT: !if.then:
// CHECK:STDOUT: %G.ref: %G.type = name_ref G, file.%G.decl [concrete = constants.%G]
// CHECK:STDOUT: %G.call: init %empty_tuple.type = call %G.ref()
// CHECK:STDOUT: br !if.else
// CHECK:STDOUT:
// CHECK:STDOUT: !if.else:
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Destroy.WithSelf.SubobjectDestroy.loc14_12.1(%self.param: ref %empty_struct_type) = "no_op";
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Destroy.WithSelf.Op.loc14_12.1(%self.param: ref %empty_struct_type) = "no_op";
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Destroy.WithSelf.SelfDestruct.loc14_12.1(%self.param: ref %empty_struct_type) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %Destroy.WithSelf.Op.call: init %empty_tuple.type = call generated.%Destroy.WithSelf.Op.decl.5f94cf.1(%self.param)
// CHECK:STDOUT: %Destroy.WithSelf.SubobjectDestroy.call: init %empty_tuple.type = call generated.%Destroy.WithSelf.SubobjectDestroy.decl.763c71.1(%self.param)
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Destroy.WithSelf.SubobjectDestroy.loc14_12.2(%self.param: ref %A) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Destroy.WithSelf.Op.loc14_12.2(%self.param: ref %A) = "no_op";
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Destroy.WithSelf.SelfDestruct.loc14_12.2(%self.param: ref %A) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %Destroy.WithSelf.Op.call: init %empty_tuple.type = call generated.%Destroy.WithSelf.Op.decl.5f94cf.2(%self.param)
// CHECK:STDOUT: %Destroy.WithSelf.SubobjectDestroy.call: init %empty_tuple.type = call generated.%Destroy.WithSelf.SubobjectDestroy.decl.763c71.2(%self.param)
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
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