carbon-language/carbon-lang
1
0
Fork 0
mirror of https://github.com/carbon-language/carbon-lang.git synced 2026-10-02 13:25:49 +01:00
Code Issues Packages Projects Releases 10 Wiki Activity

Add builtin functions for destroy, with special requirements in facet types (#6035)

Browse Source 
This is in support of a goal of changing the blanket `destroy` impl to
use (roughly):

```
private fn CanAggregateDestroy() -> type = "type.can_aggregate_destroy";

// Handles aggregate type destruction.
impl forall [AggregateDestroyT:! CanAggregateDestroy()] AggregateDestroyT as Destroy {
  fn Op[addr self: Self*]() = "type.aggregate_destroy";
}
```

That isn't done here because there's still other issues that migrating
raises. What this *does* do is add the builtin functions, and in
particular, support to `FacetTypeInfo` to make `CanAggregateDestroy`
work.

The "special requirement" approach in `FacetTypeInfo` allows us to
support restricting a blanket impl under the current approach of impls.
Maybe we'll find a cleaner approach that can work in the future, but
this fits into the current model by propagating similar to other
requirements. I'm using an enum mask because we have a number of similar
things to add (e.g. copy, move) but I'm not sure we need a full vector.

A few alternatives considered were:

- Supporting syntax more like `where .Self impls
TypeCanAggregateDestroy(.Self, SupportedInterface,
UnsupportedInterface)`. I think it'd be a little cleaner, but requires
better compile-time evaluation in order to assess the type of the call.
Right now it's expected to be a `FacetType` too early to make this work,
and I was concerned about pouring too much more time down this route.
- Providing an actual interface, in particular doing name lookup back
into `Core.` for an interface. This would've added name lookup overhead,
and the question of whether an `impl` exists.
- Generating an interface. This avoids the name lookup, but would still
raise the question of whether an `impl` should also be generated. Work
I've previously done generating interfaces for class destruction also
feels complex to both write and understand (an unfortunate issue).
- Still modeling as an `ImplsConstraint`, for example by defining a
special `InterfaceId::CanAggregateDestroy = -2` similar to what we do on
other ids. I was hesitant because of how this expands the number of
modes of `InterfaceId`, and things for consuming code to watch out for,
for what feels like a relatively niche set of use-cases that are only
interface-like.

---------

Co-authored-by: Dana Jansens <danakj@orodu.net>
This commit is contained in:
Jon Ross-Perkins
2025-09-15 17:03:43 +00:00
committed by GitHub
co-authored by Dana Jansens
parent 3ec0bcb4fd
commit 5e3bb523f8
401 changed files with 20575 additions and 20097 deletions
Download Patch File Download Diff File Expand all files Collapse all files
toolchain/check/testdata/interop/cpp/function/function.carbon
Vendored
+13 -13
View File
@@ -316,18 +316,18 @@ fn F() {
// CHECK:STDOUT: %int_1.5b8: Core.IntLiteral = int_value 1 [concrete]
// CHECK:STDOUT: %int_32: Core.IntLiteral = int_value 32 [concrete]
// CHECK:STDOUT: %i32: type = class_type @Int, @Int(%int_32) [concrete]
// CHECK:STDOUT: %As.type.047: type = facet_type <@As, @As(%i32)> [concrete]
// CHECK:STDOUT: %As.type.dbd: type = facet_type <@As, @As(%i32)> [concrete]
// CHECK:STDOUT: %As.Convert.type.99b: type = fn_type @As.Convert, @As(%i32) [concrete]
// CHECK:STDOUT: %To: Core.IntLiteral = bind_symbolic_name To, 0 [symbolic]
// CHECK:STDOUT: %Core.IntLiteral.as.As.impl.Convert.type.676: type = fn_type @Core.IntLiteral.as.As.impl.Convert, @Core.IntLiteral.as.As.impl(%To) [symbolic]
// CHECK:STDOUT: %Core.IntLiteral.as.As.impl.Convert.086: %Core.IntLiteral.as.As.impl.Convert.type.676 = struct_value () [symbolic]
// CHECK:STDOUT: %As.impl_witness.a7b: <witness> = impl_witness imports.%As.impl_witness_table.3fe, @Core.IntLiteral.as.As.impl(%int_32) [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.As.impl.Convert.type.7bd: type = fn_type @Core.IntLiteral.as.As.impl.Convert, @Core.IntLiteral.as.As.impl(%int_32) [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.As.impl.Convert.11b: %Core.IntLiteral.as.As.impl.Convert.type.7bd = struct_value () [concrete]
// CHECK:STDOUT: %As.facet: %As.type.047 = facet_value Core.IntLiteral, (%As.impl_witness.a7b) [concrete]
// CHECK:STDOUT: %.323: type = fn_type_with_self_type %As.Convert.type.99b, %As.facet [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.As.impl.Convert.bound: <bound method> = bound_method %int_1.5b8, %Core.IntLiteral.as.As.impl.Convert.11b [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.As.impl.Convert.specific_fn: <specific function> = specific_function %Core.IntLiteral.as.As.impl.Convert.11b, @Core.IntLiteral.as.As.impl.Convert(%int_32) [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.As.impl.Convert.type.565: type = fn_type @Core.IntLiteral.as.As.impl.Convert, @Core.IntLiteral.as.As.impl(%To) [symbolic]
// CHECK:STDOUT: %Core.IntLiteral.as.As.impl.Convert.d2c: %Core.IntLiteral.as.As.impl.Convert.type.565 = struct_value () [symbolic]
// CHECK:STDOUT: %As.impl_witness.080: <witness> = impl_witness imports.%As.impl_witness_table.5ad, @Core.IntLiteral.as.As.impl(%int_32) [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.As.impl.Convert.type.aaf: type = fn_type @Core.IntLiteral.as.As.impl.Convert, @Core.IntLiteral.as.As.impl(%int_32) [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.As.impl.Convert.414: %Core.IntLiteral.as.As.impl.Convert.type.aaf = struct_value () [concrete]
// CHECK:STDOUT: %As.facet: %As.type.dbd = facet_value Core.IntLiteral, (%As.impl_witness.080) [concrete]
// CHECK:STDOUT: %.351: type = fn_type_with_self_type %As.Convert.type.99b, %As.facet [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.As.impl.Convert.bound: <bound method> = bound_method %int_1.5b8, %Core.IntLiteral.as.As.impl.Convert.414 [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.As.impl.Convert.specific_fn: <specific function> = specific_function %Core.IntLiteral.as.As.impl.Convert.414, @Core.IntLiteral.as.As.impl.Convert(%int_32) [concrete]
// CHECK:STDOUT: %bound_method: <bound method> = bound_method %int_1.5b8, %Core.IntLiteral.as.As.impl.Convert.specific_fn [concrete]
// CHECK:STDOUT: %int_1.5d2: %i32 = int_value 1 [concrete]
// CHECK:STDOUT: }
@@ -338,8 +338,8 @@ fn F() {
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %.a21: %.c5d = cpp_overload_set_value @As.Convert [concrete = constants.%empty_struct]
// CHECK:STDOUT: %Core.import_ref.52c: @Core.IntLiteral.as.As.impl.%Core.IntLiteral.as.As.impl.Convert.type (%Core.IntLiteral.as.As.impl.Convert.type.676) = import_ref Core//prelude/parts/int, loc32_39, loaded [symbolic = @Core.IntLiteral.as.As.impl.%Core.IntLiteral.as.As.impl.Convert (constants.%Core.IntLiteral.as.As.impl.Convert.086)]
// CHECK:STDOUT: %As.impl_witness_table.3fe = impl_witness_table (%Core.import_ref.52c), @Core.IntLiteral.as.As.impl [concrete]
// CHECK:STDOUT: %Core.import_ref.99c: @Core.IntLiteral.as.As.impl.%Core.IntLiteral.as.As.impl.Convert.type (%Core.IntLiteral.as.As.impl.Convert.type.565) = import_ref Core//prelude/parts/int, loc32_39, loaded [symbolic = @Core.IntLiteral.as.As.impl.%Core.IntLiteral.as.As.impl.Convert (constants.%Core.IntLiteral.as.As.impl.Convert.d2c)]
// CHECK:STDOUT: %As.impl_witness_table.5ad = impl_witness_table (%Core.import_ref.99c), @Core.IntLiteral.as.As.impl [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F() {
@@ -349,7 +349,7 @@ fn F() {
// CHECK:STDOUT: %int_1: Core.IntLiteral = int_value 1 [concrete = constants.%int_1.5b8]
// CHECK:STDOUT: %int_32: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
// CHECK:STDOUT: %i32: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
// CHECK:STDOUT: %impl.elem0: %.323 = impl_witness_access constants.%As.impl_witness.a7b, element0 [concrete = constants.%Core.IntLiteral.as.As.impl.Convert.11b]
// CHECK:STDOUT: %impl.elem0: %.351 = impl_witness_access constants.%As.impl_witness.080, element0 [concrete = constants.%Core.IntLiteral.as.As.impl.Convert.414]
// CHECK:STDOUT: %bound_method.loc15_13.1: <bound method> = bound_method %int_1, %impl.elem0 [concrete = constants.%Core.IntLiteral.as.As.impl.Convert.bound]
// CHECK:STDOUT: %specific_fn: <specific function> = specific_function %impl.elem0, @Core.IntLiteral.as.As.impl.Convert(constants.%int_32) [concrete = constants.%Core.IntLiteral.as.As.impl.Convert.specific_fn]
// CHECK:STDOUT: %bound_method.loc15_13.2: <bound method> = bound_method %int_1, %specific_fn [concrete = constants.%bound_method]