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.
83 lines
3.1 KiB
Plaintext
83 lines
3.1 KiB
Plaintext
// 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
|
|
//
|
|
// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/none.carbon
|
|
//
|
|
// AUTOUPDATE
|
|
// TIP: To test this file alone, run:
|
|
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/interface/import_interface_decl.carbon
|
|
// TIP: To dump output, run:
|
|
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interface/import_interface_decl.carbon
|
|
|
|
// --- a.carbon
|
|
library "[[@TEST_NAME]]";
|
|
interface A;
|
|
|
|
// --- a.impl.carbon
|
|
//@include-in-dumps
|
|
impl library "[[@TEST_NAME]]";
|
|
|
|
// --- fail_b.carbon
|
|
library "[[@TEST_NAME]]";
|
|
interface B {}
|
|
// CHECK:STDERR: fail_b.carbon:[[@LINE+4]]:1: error: impl declared but not defined [ImplMissingDefinition]
|
|
// CHECK:STDERR: impl () as B;
|
|
// CHECK:STDERR: ^~~~~~~~~~~~~
|
|
// CHECK:STDERR:
|
|
impl () as B;
|
|
|
|
// --- b.impl.carbon
|
|
//@include-in-dumps
|
|
impl library "[[@TEST_NAME]]";
|
|
|
|
// CHECK:STDOUT: --- a.impl.carbon
|
|
// CHECK:STDOUT:
|
|
// CHECK:STDOUT: imports {
|
|
// CHECK:STDOUT: %Main.A = import_ref Main//a, A, unloaded
|
|
// CHECK:STDOUT: }
|
|
// CHECK:STDOUT:
|
|
// CHECK:STDOUT: file {
|
|
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
|
|
// CHECK:STDOUT: .A = imports.%Main.A
|
|
// CHECK:STDOUT: }
|
|
// CHECK:STDOUT: %default.import.loc2_17.1 = import <none>
|
|
// CHECK:STDOUT: %default.import.loc2_17.2 = import <none>
|
|
// CHECK:STDOUT: }
|
|
// CHECK:STDOUT:
|
|
// CHECK:STDOUT: --- b.impl.carbon
|
|
// CHECK:STDOUT:
|
|
// CHECK:STDOUT: constants {
|
|
// CHECK:STDOUT: %B.type: type = facet_type <@B> [concrete]
|
|
// CHECK:STDOUT: %Self: %B.type = symbolic_binding Self, 0 [symbolic]
|
|
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
|
|
// CHECK:STDOUT: }
|
|
// CHECK:STDOUT:
|
|
// CHECK:STDOUT: imports {
|
|
// CHECK:STDOUT: %Main.B = import_ref Main//b, B, unloaded
|
|
// CHECK:STDOUT: %Main.import_ref.33f = import_ref Main//b, loc2_13, unloaded
|
|
// CHECK:STDOUT: %Main.import_ref.e5c: type = import_ref Main//b, loc7_7, loaded [concrete = constants.%empty_tuple.type]
|
|
// CHECK:STDOUT: %Main.import_ref.9f2: type = import_ref Main//b, loc7_12, loaded [concrete = constants.%B.type]
|
|
// CHECK:STDOUT: }
|
|
// CHECK:STDOUT:
|
|
// CHECK:STDOUT: file {
|
|
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
|
|
// CHECK:STDOUT: .B = imports.%Main.B
|
|
// CHECK:STDOUT: }
|
|
// CHECK:STDOUT: %default.import.loc2_17.1 = import <none>
|
|
// CHECK:STDOUT: %default.import.loc2_17.2 = import <none>
|
|
// CHECK:STDOUT: }
|
|
// CHECK:STDOUT:
|
|
// CHECK:STDOUT: interface @B [from "fail_b.carbon"] {
|
|
// CHECK:STDOUT: !members:
|
|
// CHECK:STDOUT: .Self = imports.%Main.import_ref.33f
|
|
// CHECK:STDOUT: witness = ()
|
|
// CHECK:STDOUT:
|
|
// CHECK:STDOUT: !requires:
|
|
// CHECK:STDOUT: }
|
|
// CHECK:STDOUT:
|
|
// CHECK:STDOUT: impl @empty_tuple.type.as.B.impl: imports.%Main.import_ref.e5c as imports.%Main.import_ref.9f2 [from "fail_b.carbon"];
|
|
// CHECK:STDOUT:
|
|
// CHECK:STDOUT: specific @B(constants.%Self) {}
|
|
// CHECK:STDOUT:
|