mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 22:02:23 +01:00
Dana Jansens
917a6ea971
Currently each interface has a `Self` facet internally that becomes a binding to every entity inside the interface: associated constants, functions, and require decls. Each of these has to be independently generic as a result. This makes is challenging in extended name lookup to move into an extended scope of an interface, as we have a specific for the interface, but the names within require a different specific that includes a `Self` facet value. We generalize this relationship by adding a second generic to Interface, called `generic_with_self`. When we want to work with entities inside the interface, we move from the interface-without-specific to the interface-with-self specific by adding a Self to the specific. This is done independently of any particular entity inside the Interface, as those entities are now all members of the interface-with-self generic. Associated constants no longer need a generic of their own, as they do not have separate generic bindings. Functions retain a generic, but if the function has no generic arguments, it will have no bindings of its own now. Require decls retain a generic so that their specific can be instantiated separately from the interface. Requiring the interface to be complete does not require the types in a require decl to be complete unless it is modified by `extend`. So we allow them to be completed later by keeping them in a separate generic. Named constraints look like interfaces and gain the additional inner generic-with-self, with the same relationship to require decls. This removes the need for name lookup to perform Substitution of a Self facet into the extended scope instruction. Instead, the `SpecificConstant` instruction inserted by a `require` decl is part of the interface-with-self generic. When looking through a FacetType for extended scopes, for each interface, we push the scope with the specific for the interface-with-self. Then the constant value of the `SpecificConstant` is correctly modified by the provided self automatically through applying that specific.
107 lines
4.6 KiB
Plaintext
107 lines
4.6 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/none.carbon
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// TODO: Add ranges and switch to "--dump-sem-ir-ranges=only".
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// EXTRA-ARGS: --dump-sem-ir-ranges=if-present
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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/impl/fail_alias.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/impl/fail_alias.carbon
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interface I {}
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class C {}
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alias AI = I;
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alias AC = C;
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impl AC as AI {}
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// CHECK:STDERR: fail_alias.carbon:[[@LINE+7]]:1: error: redefinition of `impl AC as AI` [ImplRedefinition]
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// CHECK:STDERR: impl AC as AI {}
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// CHECK:STDERR: ^~~~~~~~~~~~~~~
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// CHECK:STDERR: fail_alias.carbon:[[@LINE-5]]:1: note: previous definition was here [ImplPreviousDefinition]
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// CHECK:STDERR: impl AC as AI {}
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// CHECK:STDERR: ^~~~~~~~~~~~~~~
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// CHECK:STDERR:
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impl AC as AI {}
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// CHECK:STDOUT: --- fail_alias.carbon
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// CHECK:STDOUT:
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// CHECK:STDOUT: constants {
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// CHECK:STDOUT: %I.type: type = facet_type <@I> [concrete]
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// CHECK:STDOUT: %Self: %I.type = symbolic_binding Self, 0 [symbolic]
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// CHECK:STDOUT: %C: type = class_type @C [concrete]
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// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
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// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete]
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// CHECK:STDOUT: %I.impl_witness: <witness> = impl_witness @C.as.I.impl.e47215.1.%I.impl_witness_table [concrete]
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// CHECK:STDOUT: %I.facet: %I.type = facet_value %C, (%I.impl_witness) [concrete]
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: file {
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// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
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// CHECK:STDOUT: .I = %I.decl
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// CHECK:STDOUT: .C = %C.decl
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// CHECK:STDOUT: .AI = %AI
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// CHECK:STDOUT: .AC = %AC
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// CHECK:STDOUT: }
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// CHECK:STDOUT: %I.decl: type = interface_decl @I [concrete = constants.%I.type] {} {}
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// CHECK:STDOUT: %C.decl: type = class_decl @C [concrete = constants.%C] {} {}
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// CHECK:STDOUT: %I.ref: type = name_ref I, %I.decl [concrete = constants.%I.type]
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// CHECK:STDOUT: %AI: type = alias_binding AI, %I.decl [concrete = constants.%I.type]
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// CHECK:STDOUT: %C.ref: type = name_ref C, %C.decl [concrete = constants.%C]
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// CHECK:STDOUT: %AC: type = alias_binding AC, %C.decl [concrete = constants.%C]
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// CHECK:STDOUT: impl_decl @C.as.I.impl.e47215.1 [concrete] {} {
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// CHECK:STDOUT: %AC.ref: type = name_ref AC, file.%AC [concrete = constants.%C]
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// CHECK:STDOUT: %AI.ref: type = name_ref AI, file.%AI [concrete = constants.%I.type]
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// CHECK:STDOUT: }
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// CHECK:STDOUT: impl_decl @C.as.I.impl.e47215.2 [concrete] {} {
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// CHECK:STDOUT: %AC.ref: type = name_ref AC, file.%AC [concrete = constants.%C]
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// CHECK:STDOUT: %AI.ref: type = name_ref AI, file.%AI [concrete = constants.%I.type]
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// CHECK:STDOUT: }
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: interface @I {
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// CHECK:STDOUT: %Self: %I.type = symbolic_binding Self, 0 [symbolic = constants.%Self]
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// CHECK:STDOUT: interface_with_self_decl @I [concrete]
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// CHECK:STDOUT:
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// CHECK:STDOUT: !members:
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// CHECK:STDOUT: .Self = %Self
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// CHECK:STDOUT: witness = ()
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// CHECK:STDOUT:
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// CHECK:STDOUT: !requires:
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: impl @C.as.I.impl.e47215.1: %AC.ref as %AI.ref {
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// CHECK:STDOUT: %I.impl_witness_table = impl_witness_table (), @C.as.I.impl.e47215.1 [concrete]
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// CHECK:STDOUT: %I.impl_witness: <witness> = impl_witness %I.impl_witness_table [concrete = constants.%I.impl_witness]
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// CHECK:STDOUT:
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// CHECK:STDOUT: !members:
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// CHECK:STDOUT: witness = %I.impl_witness
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: impl @C.as.I.impl.e47215.2: %AC.ref as %AI.ref {
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// CHECK:STDOUT: !members:
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// CHECK:STDOUT: witness = <error>
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: class @C {
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// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness constants.%empty_struct_type [concrete = constants.%complete_type]
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// CHECK:STDOUT: complete_type_witness = %complete_type
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// CHECK:STDOUT:
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// CHECK:STDOUT: !members:
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// CHECK:STDOUT: .Self = constants.%C
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: specific @I(constants.%Self) {
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// CHECK:STDOUT: !definition:
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: specific @I(constants.%I.facet) {
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// CHECK:STDOUT: !definition:
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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