mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-25 09:00:11 +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.
84 lines
4.0 KiB
Plaintext
84 lines
4.0 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/interface/basic.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/interface/basic.carbon
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interface Empty {
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}
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interface ForwardDeclared;
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interface ForwardDeclared {
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fn F();
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}
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// CHECK:STDOUT: --- basic.carbon
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// CHECK:STDOUT:
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// CHECK:STDOUT: constants {
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// CHECK:STDOUT: %Empty.type: type = facet_type <@Empty> [concrete]
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// CHECK:STDOUT: %Self.61e: %Empty.type = symbolic_binding Self, 0 [symbolic]
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// CHECK:STDOUT: %ForwardDeclared.type: type = facet_type <@ForwardDeclared> [concrete]
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// CHECK:STDOUT: %Self.8e7: %ForwardDeclared.type = symbolic_binding Self, 0 [symbolic]
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// CHECK:STDOUT: %ForwardDeclared.WithSelf.F.type: type = fn_type @ForwardDeclared.WithSelf.F, @ForwardDeclared(%Self.8e7) [symbolic]
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// CHECK:STDOUT: %ForwardDeclared.WithSelf.F: %ForwardDeclared.WithSelf.F.type = struct_value () [symbolic]
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// CHECK:STDOUT: %ForwardDeclared.assoc_type: type = assoc_entity_type @ForwardDeclared [concrete]
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// CHECK:STDOUT: %assoc0: %ForwardDeclared.assoc_type = assoc_entity element0, @ForwardDeclared.%ForwardDeclared.WithSelf.F.decl [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: .Empty = %Empty.decl
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// CHECK:STDOUT: .ForwardDeclared = %ForwardDeclared.decl.loc18
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// CHECK:STDOUT: }
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// CHECK:STDOUT: %Empty.decl: type = interface_decl @Empty [concrete = constants.%Empty.type] {} {}
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// CHECK:STDOUT: %ForwardDeclared.decl.loc18: type = interface_decl @ForwardDeclared [concrete = constants.%ForwardDeclared.type] {} {}
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// CHECK:STDOUT: %ForwardDeclared.decl.loc20: type = interface_decl @ForwardDeclared [concrete = constants.%ForwardDeclared.type] {} {}
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: interface @Empty {
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// CHECK:STDOUT: %Self: %Empty.type = symbolic_binding Self, 0 [symbolic = constants.%Self.61e]
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// CHECK:STDOUT: interface_with_self_decl @Empty [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: interface @ForwardDeclared {
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// CHECK:STDOUT: %Self.loc20: %ForwardDeclared.type = symbolic_binding Self, 0 [symbolic = constants.%Self.8e7]
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// CHECK:STDOUT: interface_with_self_decl @ForwardDeclared [concrete]
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// CHECK:STDOUT:
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// CHECK:STDOUT: !with Self:
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// CHECK:STDOUT: %ForwardDeclared.WithSelf.F.decl: @ForwardDeclared.%ForwardDeclared.WithSelf.F.type (%ForwardDeclared.WithSelf.F.type) = fn_decl @ForwardDeclared.WithSelf.F [symbolic = @ForwardDeclared.%ForwardDeclared.WithSelf.F (constants.%ForwardDeclared.WithSelf.F)] {} {}
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// CHECK:STDOUT: %assoc0: %ForwardDeclared.assoc_type = assoc_entity element0, %ForwardDeclared.WithSelf.F.decl [concrete = constants.%assoc0]
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// CHECK:STDOUT:
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// CHECK:STDOUT: !members:
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// CHECK:STDOUT: .Self = %Self.loc20
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// CHECK:STDOUT: .F = %assoc0
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// CHECK:STDOUT: witness = (%ForwardDeclared.WithSelf.F.decl)
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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: generic fn @ForwardDeclared.WithSelf.F(@ForwardDeclared.%Self.loc20: %ForwardDeclared.type) {
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// CHECK:STDOUT: fn();
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: specific @Empty(constants.%Self.61e) {}
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// CHECK:STDOUT:
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// CHECK:STDOUT: specific @ForwardDeclared(constants.%Self.8e7) {}
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// CHECK:STDOUT:
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// CHECK:STDOUT: specific @ForwardDeclared.WithSelf.F(constants.%Self.8e7) {}
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// CHECK:STDOUT:
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