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https://github.com/carbon-language/carbon-lang.git
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Christopher Di Bella
05a7ecbd34
Determining that a type has trivial destruction requires checking whether all of its subobjects have trivial destruction and whether its type has a custom witness for `Destroy.Op`. This isn't possible when `Destroy` is the custodian for `Destroy.Op` and `SubobjectDestroy.Op`, so we need to make `SubobjectDestroy` its own interface. `Destroy.SelfDestruct` becomes a standalone function because it depends on `SubobjectDestroy` and `Destroy` being implemented, and is also responsible for generating any custom witnesses for both interfaces. Making `SelfDestruct` an interface was experimented with, but this required a blanket impl that caused issues for facet types. `Destroy` depends on `SubobjectDestroy` to be implemented. We'd ideally use `require impls SubobjectDestroy`, but it isn't complete yet, and it also causes problems when `Destroy` is implemented inside the class definition. We work around this by temporarily renaming the `Destroy` interface to `DestroyImpl`, and introducing a constraint called `Destroy` so that user code doesn't need to write `Core.SubobjectDestroy & Core.Destroy`.
95 lines
5.5 KiB
Plaintext
95 lines
5.5 KiB
Plaintext
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/bool.carbon
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//
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// AUTOUPDATE
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// TIP: To test this file alone, run:
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// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/if/lifetime.carbon
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// TIP: To dump output, run:
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// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/if/lifetime.carbon
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// --- condition_lifetime.carbon
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library "[[@TEST_NAME]]";
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class A {
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fn F() -> bool;
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}
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fn Make() -> A;
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fn G();
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fn F() {
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//@dump-sem-ir-begin
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// The temporary A object is destroyed before the branch.
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if (Make().F()) {
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G();
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}
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//@dump-sem-ir-end
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}
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// CHECK:STDOUT: --- condition_lifetime.carbon
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// CHECK:STDOUT:
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// CHECK:STDOUT: constants {
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// CHECK:STDOUT: type: type = facet_type <type> [concrete]
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// CHECK:STDOUT: %A: type = class_type @A [concrete]
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// CHECK:STDOUT: %A.F.type: type = fn_type @A.F [concrete]
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// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
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// CHECK:STDOUT: %A.F: %A.F.type = struct_value () [concrete]
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// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
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// CHECK:STDOUT: %Make.type: type = fn_type @Make [concrete]
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// CHECK:STDOUT: %Make: %Make.type = struct_value () [concrete]
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// CHECK:STDOUT: %G.type: type = fn_type @G [concrete]
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// CHECK:STDOUT: %G: %G.type = struct_value () [concrete]
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// CHECK:STDOUT: %Destroy.type: type = facet_type <@Destroy> [concrete]
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// CHECK:STDOUT: %SubobjectDestroy.type: type = facet_type <@SubobjectDestroy> [concrete]
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// CHECK:STDOUT: %T.09f: %SubobjectDestroy.type = symbolic_binding T, 0 [symbolic]
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// CHECK:STDOUT: %T.as_type.as.DestroyImpl.impl.Op.type.dea: type = fn_type @T.as_type.as.DestroyImpl.impl.Op, @T.as_type.as.DestroyImpl.impl(%T.09f) [symbolic]
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// CHECK:STDOUT: %T.as_type.as.DestroyImpl.impl.Op.6e5: %T.as_type.as.DestroyImpl.impl.Op.type.dea = struct_value () [symbolic]
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// CHECK:STDOUT: %SubobjectDestroy.WithSelf.Op.type.6870fd.2: type = fn_type @SubobjectDestroy.WithSelf.Op.loc14_12.2 [concrete]
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// CHECK:STDOUT: %SubobjectDestroy.WithSelf.Op.30f1ee.2: %SubobjectDestroy.WithSelf.Op.type.6870fd.2 = struct_value () [concrete]
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// CHECK:STDOUT: %custom_witness.b80ef6.2: <witness> = custom_witness (%SubobjectDestroy.WithSelf.Op.30f1ee.2), @SubobjectDestroy [concrete]
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// CHECK:STDOUT: %SubobjectDestroy.facet.9bf: %SubobjectDestroy.type = facet_value %A, (%custom_witness.b80ef6.2) [concrete]
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// CHECK:STDOUT: %DestroyImpl.impl_witness.6d1: <witness> = impl_witness imports.%DestroyImpl.impl_witness_table, @T.as_type.as.DestroyImpl.impl(%SubobjectDestroy.facet.9bf) [concrete]
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// CHECK:STDOUT: %Destroy.facet: %Destroy.type = facet_value %A, (%DestroyImpl.impl_witness.6d1, %custom_witness.b80ef6.2) [concrete]
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: imports {
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// CHECK:STDOUT: %Core.import_ref.74d: @T.as_type.as.DestroyImpl.impl.%T.as_type.as.DestroyImpl.impl.Op.type (%T.as_type.as.DestroyImpl.impl.Op.type.dea) = import_ref Core//prelude/parts/destroy, loc{{\d+_\d+}}, loaded [symbolic = @T.as_type.as.DestroyImpl.impl.%T.as_type.as.DestroyImpl.impl.Op (constants.%T.as_type.as.DestroyImpl.impl.Op.6e5)]
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// CHECK:STDOUT: %DestroyImpl.impl_witness_table = impl_witness_table (%Core.import_ref.74d), @T.as_type.as.DestroyImpl.impl [concrete]
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @F() {
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// CHECK:STDOUT: !entry:
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// CHECK:STDOUT: %Make.ref: %Make.type = name_ref Make, file.%Make.decl [concrete = constants.%Make]
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// CHECK:STDOUT: %.loc14_12.1: ref %A = temporary_storage
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// CHECK:STDOUT: %Make.call: init %A to %.loc14_12.1 = call %Make.ref()
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// CHECK:STDOUT: %.loc14_12.2: ref %A = temporary %.loc14_12.1, %Make.call
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// CHECK:STDOUT: %F.ref: %A.F.type = name_ref F, @A.%A.F.decl [concrete = constants.%A.F]
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// CHECK:STDOUT: %A.F.call: init bool = call %F.ref()
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// CHECK:STDOUT: %.loc14_17.1: bool = value_of_initializer %A.F.call
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// CHECK:STDOUT: %.loc14_17.2: bool = converted %A.F.call, %.loc14_17.1
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// CHECK:STDOUT: %Destroy.facet.loc14_12.1: %Destroy.type = facet_value constants.%A, (constants.%DestroyImpl.impl_witness.6d1, constants.%custom_witness.b80ef6.2) [concrete = constants.%Destroy.facet]
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// CHECK:STDOUT: %.loc14_12.3: %Destroy.type = converted constants.%A, %Destroy.facet.loc14_12.1 [concrete = constants.%Destroy.facet]
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// CHECK:STDOUT: %Destroy.facet.loc14_12.2: %Destroy.type = facet_value constants.%A, (constants.%DestroyImpl.impl_witness.6d1, constants.%custom_witness.b80ef6.2) [concrete = constants.%Destroy.facet]
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// CHECK:STDOUT: %.loc14_12.4: %Destroy.type = converted constants.%A, %Destroy.facet.loc14_12.2 [concrete = constants.%Destroy.facet]
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// CHECK:STDOUT: <elided>
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// CHECK:STDOUT: %SelfDestruct.call: init %empty_tuple.type = call %SelfDestruct.specific_fn(%.loc14_12.2)
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// CHECK:STDOUT: if %.loc14_17.2 br !if.then else br !if.else
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// CHECK:STDOUT:
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// CHECK:STDOUT: !if.then:
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// CHECK:STDOUT: %G.ref: %G.type = name_ref G, file.%G.decl [concrete = constants.%G]
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// CHECK:STDOUT: %G.call: init %empty_tuple.type = call %G.ref()
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// CHECK:STDOUT: br !if.else
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// CHECK:STDOUT:
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// CHECK:STDOUT: !if.else:
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// CHECK:STDOUT: <elided>
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @SubobjectDestroy.WithSelf.Op.loc14_12.1(%self.param: ref %empty_struct_type) = "no_op";
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @SubobjectDestroy.WithSelf.Op.loc14_12.2(%self.param: ref %A) = "no_op";
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// CHECK:STDOUT:
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