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https://github.com/carbon-language/carbon-lang.git
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Jon Ross-Perkins
91f0c23124
Building on #3636 which handles the general import case, add special casing for namespaces. Namespaces can be combined cross-IR, so it's a little more complex. The implementation adds import_id to the Namespace instruction as a reference to find the original using the normal structure. This is achieved by moving the name_id to NameScope to free up space. --- I considered a few alternatives... I considered adding import_id to NameScope, but: 1. It's more consistent with things such as Function or Class that provide name_id on the info object rather than the instruction. 2. I thought it more likely that there would be more NameScope cases that might want a name_id rather than the import_id, since ImportRef will typically be used. I considered putting the import source (cross-ref IR id + inst id) on the NameScope versus a separate ImportRef, which seems like the strongest argument towards the NameScope approach because it removes an instruction. That just felt inconsistent though, and the overhead of instruction-per-imported-namespace should be low (theoretically few namespaces should be used). Plus I feel a bit odd adding two generally-unused ids to NameScope. A specialized Namespace structure could also have been created to store the import_id, but that would add an indirection to the NameScope.
54 lines
2.0 KiB
Plaintext
54 lines
2.0 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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// AUTOUPDATE
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base class B {}
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class C {
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extend base: B;
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}
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// CHECK:STDERR: fail_base_unbound.carbon:[[@LINE+3]]:12: ERROR: Expression cannot be used as a value.
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// CHECK:STDERR: let b: B = C.base;
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// CHECK:STDERR: ^~~~~~
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let b: B = C.base;
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// CHECK:STDOUT: --- fail_base_unbound.carbon
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// CHECK:STDOUT:
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// CHECK:STDOUT: constants {
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// CHECK:STDOUT: %B: type = class_type @B [template]
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// CHECK:STDOUT: %.1: type = struct_type {} [template]
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// CHECK:STDOUT: %C: type = class_type @C [template]
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// CHECK:STDOUT: %.2: type = tuple_type () [template]
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// CHECK:STDOUT: %.3: type = ptr_type {} [template]
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// CHECK:STDOUT: %.4: type = unbound_element_type C, B [template]
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// CHECK:STDOUT: %.5: type = struct_type {.base: B} [template]
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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 {.B = %B.decl, .C = %C.decl} [template]
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// CHECK:STDOUT: %B.decl = class_decl @B, ()
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// CHECK:STDOUT: %C.decl = class_decl @C, ()
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// CHECK:STDOUT: %B.ref: type = name_ref B, constants.%B [template = constants.%B]
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// CHECK:STDOUT: %C.ref: type = name_ref C, constants.%C [template = constants.%C]
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// CHECK:STDOUT: %base.ref: <unbound element of class C> = name_ref base, @C.%.loc10 [template = @C.%.loc10]
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// CHECK:STDOUT: %b: B = bind_name b, <error>
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: class @B {
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// CHECK:STDOUT:
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// CHECK:STDOUT: !members:
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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: %B.ref: type = name_ref B, constants.%B [template = constants.%B]
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// CHECK:STDOUT: %.loc10: <unbound element of class C> = base_decl B, element0 [template]
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// CHECK:STDOUT:
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// CHECK:STDOUT: !members:
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// CHECK:STDOUT: .base = %.loc10
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// CHECK:STDOUT: extend name_scope1
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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