mirror of
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`.
98 lines
7.1 KiB
Plaintext
98 lines
7.1 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/convert.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/as/var_init.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/as/var_init.carbon
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// --- var_init.carbon
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library "[[@TEST_NAME]]";
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class X {
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impl () as Core.ImplicitAs(X) {
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fn Convert(unused self: ()) -> X { return {}; }
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}
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}
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fn Convert(unused t: ()) {
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//@dump-sem-ir-begin
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var unused x: X = ();
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//@dump-sem-ir-end
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}
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// CHECK:STDOUT: --- var_init.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: %X: type = class_type @X [concrete]
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// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
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// CHECK:STDOUT: %empty_tuple: %empty_tuple.type = tuple_value () [concrete]
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// CHECK:STDOUT: %ImplicitAs.type.3d3: type = facet_type <@ImplicitAs, @ImplicitAs(%X)> [concrete]
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// CHECK:STDOUT: %ImplicitAs.impl_witness: <witness> = impl_witness @empty_tuple.type.as.ImplicitAs.impl.%ImplicitAs.impl_witness_table [concrete]
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// CHECK:STDOUT: %pattern_type.6cb: type = pattern_type %X [concrete]
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// CHECK:STDOUT: %empty_tuple.type.as.ImplicitAs.impl.Convert.type: type = fn_type @empty_tuple.type.as.ImplicitAs.impl.Convert [concrete]
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// CHECK:STDOUT: %empty_tuple.type.as.ImplicitAs.impl.Convert: %empty_tuple.type.as.ImplicitAs.impl.Convert.type = struct_value () [concrete]
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// CHECK:STDOUT: %ImplicitAs.facet: %ImplicitAs.type.3d3 = facet_value %empty_tuple.type, (%ImplicitAs.impl_witness) [concrete]
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// CHECK:STDOUT: %ImplicitAs.WithSelf.Convert.type.b95: type = fn_type @ImplicitAs.WithSelf.Convert, @ImplicitAs.WithSelf(%X, %ImplicitAs.facet) [concrete]
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// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
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// CHECK:STDOUT: %x.patt: %pattern_type.6cb = ref_binding_pattern x [concrete]
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// CHECK:STDOUT: %x.var_patt: %pattern_type.6cb = var_pattern %x.patt [concrete]
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// CHECK:STDOUT: %.8a9: type = fn_type_with_self_type %ImplicitAs.WithSelf.Convert.type.b95, %ImplicitAs.facet [concrete]
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// CHECK:STDOUT: %empty_tuple.type.as.ImplicitAs.impl.Convert.bound: <bound method> = bound_method %empty_tuple, %empty_tuple.type.as.ImplicitAs.impl.Convert [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.loc12_3.2 [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.fc5: %SubobjectDestroy.type = facet_value %X, (%custom_witness.b80ef6.2) [concrete]
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// CHECK:STDOUT: %DestroyImpl.impl_witness.e12: <witness> = impl_witness imports.%DestroyImpl.impl_witness_table, @T.as_type.as.DestroyImpl.impl(%SubobjectDestroy.facet.fc5) [concrete]
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// CHECK:STDOUT: %Destroy.facet: %Destroy.type = facet_value %X, (%DestroyImpl.impl_witness.e12, %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 @Convert(%t.param: %empty_tuple.type) {
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// CHECK:STDOUT: !entry:
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// CHECK:STDOUT: %x.var: ref %X = var_storage %x.var_patt
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// CHECK:STDOUT: %.loc12_22.1: %empty_tuple.type = tuple_literal () [concrete = constants.%empty_tuple]
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// CHECK:STDOUT: %impl.elem0: %.8a9 = impl_witness_access constants.%ImplicitAs.impl_witness, element0 [concrete = constants.%empty_tuple.type.as.ImplicitAs.impl.Convert]
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// CHECK:STDOUT: %bound_method: <bound method> = bound_method %.loc12_22.1, %impl.elem0 [concrete = constants.%empty_tuple.type.as.ImplicitAs.impl.Convert.bound]
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// CHECK:STDOUT: %.loc12_3.1: ref %X = splice_block %x.var {}
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// CHECK:STDOUT: %empty_tuple: %empty_tuple.type = tuple_value () [concrete = constants.%empty_tuple]
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// CHECK:STDOUT: %.loc12_22.2: %empty_tuple.type = converted %.loc12_22.1, %empty_tuple [concrete = constants.%empty_tuple]
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// CHECK:STDOUT: %empty_tuple.type.as.ImplicitAs.impl.Convert.call: init %X to %.loc12_3.1 = call %bound_method(%.loc12_22.2)
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// CHECK:STDOUT: %.loc12_3.2: init %X = converted %.loc12_22.1, %empty_tuple.type.as.ImplicitAs.impl.Convert.call
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// CHECK:STDOUT: assign %x.var, %.loc12_3.2
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// CHECK:STDOUT: %X.ref: type = name_ref X, file.%X.decl [concrete = constants.%X]
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// CHECK:STDOUT: %x: ref %X = wrapper_binding x, %x.var
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// CHECK:STDOUT: name_binding_decl {
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// CHECK:STDOUT: %x.patt: %pattern_type.6cb = ref_binding_pattern x [concrete = constants.%x.patt]
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// CHECK:STDOUT: %x.var_patt: %pattern_type.6cb = var_pattern %x.patt [concrete = constants.%x.var_patt]
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// CHECK:STDOUT: }
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// CHECK:STDOUT: %Destroy.facet.loc12_3.1: %Destroy.type = facet_value constants.%X, (constants.%DestroyImpl.impl_witness.e12, constants.%custom_witness.b80ef6.2) [concrete = constants.%Destroy.facet]
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// CHECK:STDOUT: %.loc12_3.3: %Destroy.type = converted constants.%X, %Destroy.facet.loc12_3.1 [concrete = constants.%Destroy.facet]
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// CHECK:STDOUT: %Destroy.facet.loc12_3.2: %Destroy.type = facet_value constants.%X, (constants.%DestroyImpl.impl_witness.e12, constants.%custom_witness.b80ef6.2) [concrete = constants.%Destroy.facet]
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// CHECK:STDOUT: %.loc12_3.4: %Destroy.type = converted constants.%X, %Destroy.facet.loc12_3.2 [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(%x.var)
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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.loc12_3.1(%self.param: ref %empty_struct_type) = "no_op";
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @SubobjectDestroy.WithSelf.Op.loc12_3.2(%self.param: ref %X) = "no_op";
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// CHECK:STDOUT:
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