mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 22:02:23 +01:00
Richard Smith
ce080b3549
When a class extends an interface, referring to a member name of the interface as an unqualified name should refer to the class's corresponding associated entity value, not to the associated entity itself. Similarly, in an `impl`, unqualified names of associated entities should refer to the `impl`'s corresponding value for that entity. To support this, we treat `impl`s as `extend`ing their implemented facet type, and we make lookups into an extended facet type use the `Self` type of the extending `impl` or `class` if lookup finds an associated entity. We already did the latter if the extending entity was an interface; this extends the existing support for these other cases.
157 lines
5.3 KiB
Plaintext
157 lines
5.3 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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//
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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/extend_impl.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/extend_impl.carbon
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// --- extend_impl.carbon
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library "[[@TEST_NAME]]";
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interface HasF {
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fn F();
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}
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//@dump-sem-ir-begin
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class C {
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extend impl as HasF {
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fn F() {}
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}
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}
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//@dump-sem-ir-end
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fn G(c: C) {
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C.F();
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c.F();
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}
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// --- fail_extend_impl_nonexistent.carbon
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library "[[@TEST_NAME]]";
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interface I {}
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class C {
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// CHECK:STDERR: fail_extend_impl_nonexistent.carbon:[[@LINE+4]]:15: error: name `nonexistent` not found [NameNotFound]
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// CHECK:STDERR: extend impl nonexistent as I {}
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// CHECK:STDERR: ^~~~~~~~~~~
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// CHECK:STDERR:
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extend impl nonexistent as I {}
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fn F() {
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// The erroneous self-type for an `extend` causes the error to be propagated
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// into the class scope, which prevents errors if we fail to find a name
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// in that scope.
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Self.A;
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}
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}
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// --- fail_impl_nonexistent.carbon
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library "[[@TEST_NAME]]";
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interface I {}
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class C {
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// CHECK:STDERR: fail_impl_nonexistent.carbon:[[@LINE+4]]:8: error: name `nonexistent` not found [NameNotFound]
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// CHECK:STDERR: impl nonexistent as I {}
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// CHECK:STDERR: ^~~~~~~~~~~
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// CHECK:STDERR:
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impl nonexistent as I {}
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fn F() {
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// The name lookup error still happens, since the `require` is not `extend`.
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// CHECK:STDERR: fail_impl_nonexistent.carbon:[[@LINE+4]]:5: error: member name `A` not found in `C` [MemberNameNotFoundInInstScope]
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// CHECK:STDERR: Self.A;
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// CHECK:STDERR: ^~~~~~
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// CHECK:STDERR:
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Self.A;
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}
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}
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// --- fail_extend_impl_nonexistent_pointer.carbon
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library "[[@TEST_NAME]]";
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interface I {}
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class C {
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// CHECK:STDERR: fail_extend_impl_nonexistent_pointer.carbon:[[@LINE+4]]:15: error: name `nonexistent` not found [NameNotFound]
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// CHECK:STDERR: extend impl nonexistent* as I {}
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// CHECK:STDERR: ^~~~~~~~~~~
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// CHECK:STDERR:
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extend impl nonexistent* as I {}
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fn F() {
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// The erroneous self-type for an `extend` causes the error to be propagated
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// into the class scope, which prevents errors if we fail to find a name
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// in that scope.
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Self.A;
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}
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}
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// --- fail_extend_impl_nonexistent_outside_class.carbon
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library "[[@TEST_NAME]]";
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interface I {}
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// CHECK:STDERR: fail_extend_impl_nonexistent_outside_class.carbon:[[@LINE+4]]:13: error: name `nonexistent` not found [NameNotFound]
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// CHECK:STDERR: extend impl nonexistent* as I {}
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// CHECK:STDERR: ^~~~~~~~~~~
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// CHECK:STDERR:
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extend impl nonexistent* as I {}
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// CHECK:STDOUT: --- extend_impl.carbon
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// CHECK:STDOUT:
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// CHECK:STDOUT: constants {
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// CHECK:STDOUT: %HasF.type: type = facet_type <@HasF> [concrete]
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// CHECK:STDOUT: %C: type = class_type @C [concrete]
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// CHECK:STDOUT: %HasF.impl_witness: <witness> = impl_witness @C.as.HasF.impl.%HasF.impl_witness_table [concrete]
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// CHECK:STDOUT: %C.as.HasF.impl.F.type: type = fn_type @C.as.HasF.impl.F [concrete]
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// CHECK:STDOUT: %C.as.HasF.impl.F: %C.as.HasF.impl.F.type = struct_value () [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: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: file {
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// CHECK:STDOUT: %C.decl: type = class_decl @C [concrete = constants.%C] {} {}
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: impl @C.as.HasF.impl: %Self.ref as %HasF.ref {
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// CHECK:STDOUT: %C.as.HasF.impl.F.decl: %C.as.HasF.impl.F.type = fn_decl @C.as.HasF.impl.F [concrete = constants.%C.as.HasF.impl.F] {} {}
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// CHECK:STDOUT: %HasF.impl_witness_table = impl_witness_table (%C.as.HasF.impl.F.decl), @C.as.HasF.impl [concrete]
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// CHECK:STDOUT: %HasF.impl_witness: <witness> = impl_witness %HasF.impl_witness_table [concrete = constants.%HasF.impl_witness]
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// CHECK:STDOUT:
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// CHECK:STDOUT: !members:
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// CHECK:STDOUT: .F = %C.as.HasF.impl.F.decl
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// CHECK:STDOUT: extend %HasF.ref
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// CHECK:STDOUT: witness = %HasF.impl_witness
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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: impl_decl @C.as.HasF.impl [concrete] {} {
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// CHECK:STDOUT: %Self.ref: type = name_ref Self, constants.%C [concrete = constants.%C]
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// CHECK:STDOUT: %HasF.ref: type = name_ref HasF, file.%HasF.decl [concrete = constants.%HasF.type]
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// CHECK:STDOUT: }
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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: .HasF = <poisoned>
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// CHECK:STDOUT: .F = <poisoned>
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// CHECK:STDOUT: extend @C.as.HasF.impl.%HasF.ref
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @C.as.HasF.impl.F() {
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// CHECK:STDOUT: !entry:
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// CHECK:STDOUT: return
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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