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carbon-lang/toolchain/check/testdata/impl/extend_impl.carbon
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Richard Smith 5f888e1124 Treat associated constants as entities parameterized by Self (#4837) 
Add a full entity representation for associated constants, and build a
`Generic` object for them. This `Generic` is parameterized by the
enclosing `Self` type, allowing the use of `Self` within the type of the
associated constant to be supported.

When performing impl lookup for an associated constant, produce the type
with the provided self type substituted for its `Self` along with any
generic parameters of the interface.

Split the handling of associated constant declarations into two parts,
corresponding to the code before the `=`, and the code between the `=`
and `;` (if any). The former goes into the generic declaration region;
the latter into the generic definition region. This prepares us to
handle the default value for an associated constant, but for now we're
just storing the information and not actually using it.

Remove the entity type field from `assoc_entity_type`, because it's
almost unused and is an attractive nuisance -- it must necessarily be a
type in the generic scope of the associated constant rather than in the
scope of the instruction (because there is no `Self` anywhere else),
which means that it's hard to substitute into or derive meaning from.

See `toolchain/check/testdata/impl/assoc_const_self.carbon` for tests of
the new functionality; these used to cause the toolchain to crash.
2025-01-25 02:13:52 +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
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/impl/extend_impl.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/impl/extend_impl.carbon
interface HasF {
fn F();
}
class C {
extend impl as HasF {
fn F() {}
}
}
fn G(c: C) {
C.F();
c.F();
}
// CHECK:STDOUT: --- extend_impl.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %HasF.type: type = facet_type <@HasF> [template]
// CHECK:STDOUT: %Self: %HasF.type = bind_symbolic_name Self, 0 [symbolic]
// CHECK:STDOUT: %F.type.b7b: type = fn_type @F.1 [template]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [template]
// CHECK:STDOUT: %F.f50: %F.type.b7b = struct_value () [template]
// CHECK:STDOUT: %HasF.assoc_type: type = assoc_entity_type %HasF.type [template]
// CHECK:STDOUT: %assoc0: %HasF.assoc_type = assoc_entity element0, @HasF.%F.decl [template]
// CHECK:STDOUT: %C: type = class_type @C [template]
// CHECK:STDOUT: %impl_witness: <witness> = impl_witness (@impl.%F.decl) [template]
// CHECK:STDOUT: %F.type.a65: type = fn_type @F.2 [template]
// CHECK:STDOUT: %F.ad8: %F.type.a65 = struct_value () [template]
// CHECK:STDOUT: %HasF.facet: %HasF.type = facet_value %C, %impl_witness [template]
// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [template]
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness %empty_struct_type [template]
// CHECK:STDOUT: %G.type: type = fn_type @G [template]
// CHECK:STDOUT: %G: %G.type = struct_value () [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [template] {
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/...
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [template] {
// CHECK:STDOUT: .Core = imports.%Core
// CHECK:STDOUT: .HasF = %HasF.decl
// CHECK:STDOUT: .C = %C.decl
// CHECK:STDOUT: .G = %G.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: %HasF.decl: type = interface_decl @HasF [template = constants.%HasF.type] {} {}
// CHECK:STDOUT: %C.decl: type = class_decl @C [template = constants.%C] {} {}
// CHECK:STDOUT: %G.decl: %G.type = fn_decl @G [template = constants.%G] {
// CHECK:STDOUT: %c.patt: %C = binding_pattern c
// CHECK:STDOUT: %c.param_patt: %C = value_param_pattern %c.patt, runtime_param0
// CHECK:STDOUT: } {
// CHECK:STDOUT: %c.param: %C = value_param runtime_param0
// CHECK:STDOUT: %C.ref.loc21: type = name_ref C, file.%C.decl [template = constants.%C]
// CHECK:STDOUT: %c: %C = bind_name c, %c.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @HasF {
// CHECK:STDOUT: %Self: %HasF.type = bind_symbolic_name Self, 0 [symbolic = constants.%Self]
// CHECK:STDOUT: %F.decl: %F.type.b7b = fn_decl @F.1 [template = constants.%F.f50] {} {}
// CHECK:STDOUT: %assoc0: %HasF.assoc_type = assoc_entity element0, %F.decl [template = constants.%assoc0]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self
// CHECK:STDOUT: .F = %assoc0
// CHECK:STDOUT: witness = (%F.decl)
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: impl @impl: %Self.ref as %HasF.ref {
// CHECK:STDOUT: %F.decl: %F.type.a65 = fn_decl @F.2 [template = constants.%F.ad8] {} {}
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .F = %F.decl
// CHECK:STDOUT: witness = @C.%impl_witness
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @C {
// CHECK:STDOUT: impl_decl @impl [template] {} {
// CHECK:STDOUT: %Self.ref: type = name_ref Self, constants.%C [template = constants.%C]
// CHECK:STDOUT: %HasF.ref: type = name_ref HasF, file.%HasF.decl [template = constants.%HasF.type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %impl_witness: <witness> = impl_witness (@impl.%F.decl) [template = constants.%impl_witness]
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
// CHECK:STDOUT: complete_type_witness = %complete_type
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = constants.%C
// CHECK:STDOUT: extend @impl.%HasF.ref
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @F.1(@HasF.%Self: %HasF.type) {
// CHECK:STDOUT: fn();
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F.2() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @G(%c.param_patt: %C) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %C.ref.loc22: type = name_ref C, file.%C.decl [template = constants.%C]
// CHECK:STDOUT: %F.ref.loc22: %HasF.assoc_type = name_ref F, @HasF.%assoc0 [template = constants.%assoc0]
// CHECK:STDOUT: %impl.elem0.loc22: %F.type.b7b = impl_witness_access constants.%impl_witness, element0 [template = constants.%F.ad8]
// CHECK:STDOUT: %F.call.loc22: init %empty_tuple.type = call %impl.elem0.loc22()
// CHECK:STDOUT: %c.ref: %C = name_ref c, %c
// CHECK:STDOUT: %F.ref.loc23: %HasF.assoc_type = name_ref F, @HasF.%assoc0 [template = constants.%assoc0]
// CHECK:STDOUT: %impl.elem0.loc23: %F.type.b7b = impl_witness_access constants.%impl_witness, element0 [template = constants.%F.ad8]
// CHECK:STDOUT: %F.call.loc23: init %empty_tuple.type = call %impl.elem0.loc23()
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @F.1(constants.%Self) {}
// CHECK:STDOUT:
// CHECK:STDOUT: specific @F.1(constants.%HasF.facet) {}
// CHECK:STDOUT:
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