mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 20:20:10 +01:00
Dana Jansens
fcae9610bd
The type `type` is now a `FacetType` inst with no constraints. This brings the model implemented in the toolchain into better alignment with the language design. The `SemIR::TypeType` struct remains as a scope for holding the `TypeInstId`, `ConstantId`, and `TypeId` constants, but is not an `InstKind` anymore. The `TypeType` inst looks a lot like singletons, but there are many `FacetType` insts so it doesn't quite fit that model. So we put it alongside singletons with a fixed inst id but refer to it as a more general "builtin" inst that is not a singleton. `Namespace::PackageInstId` is similar, and we group it with `TypeType` conceptually as another builtin instruction with a fixed id. No conversion is needed anymore to use a `type` as a facet, since types also have a `FacetType` type. This simplifies and removes a number of helpers and branches throughout the code. The `TypeType` inst is now part of the constant store, so we end up printing it in the constants block in every test. But it's also named `type` rather than `%type` to preserve the majority of existing formatting behaviour, though this does look different from other constants. Assisted-by: Opus 5 was used to generate a first draft and validate the refactoring. Though nearly everything non-trivial the tool wrote has been modified or rewritten.
80 lines
2.5 KiB
Plaintext
80 lines
2.5 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/destroy.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/alias/var.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/alias/var.carbon
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// --- global.carbon
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library "[[@TEST_NAME]]";
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var a: () = ();
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fn F() -> () {
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//@dump-sem-ir-begin
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// TODO: Decide if this should be allowed, and if so, whether it should be
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// spelled as
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//
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// alias b = ref a;
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alias b = a;
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//@dump-sem-ir-end
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return b;
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}
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// --- fail_local.carbon
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library "[[@TEST_NAME]]";
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fn F() -> () {
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var a: () = ();
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//@dump-sem-ir-begin
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// CHECK:STDERR: fail_local.carbon:[[@LINE+4]]:13: error: alias refers to a runtime value [AliasRequiresConstantValue]
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// CHECK:STDERR: alias b = a;
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// CHECK:STDERR: ^
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// CHECK:STDERR:
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alias b = a;
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//@dump-sem-ir-end
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return b;
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}
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// CHECK:STDOUT: --- global.carbon
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// CHECK:STDOUT:
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// CHECK:STDOUT: constants {
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// CHECK:STDOUT: type: type = facet_type <type> [concrete]
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// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @F() -> out %return.param: %empty_tuple.type {
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// CHECK:STDOUT: !entry:
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// CHECK:STDOUT: %a.ref: ref %empty_tuple.type = name_ref a, file.%a [concrete = file.%a.var]
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// CHECK:STDOUT: %b: ref %empty_tuple.type = alias_binding b, %a.ref [concrete = file.%a.var]
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// CHECK:STDOUT: <elided>
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @__global_init() {
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// CHECK:STDOUT: !entry:
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// CHECK:STDOUT: <elided>
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: --- fail_local.carbon
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// CHECK:STDOUT:
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// CHECK:STDOUT: constants {
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// CHECK:STDOUT: type: type = facet_type <type> [concrete]
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// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @F() -> out %return.param: %empty_tuple.type {
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// CHECK:STDOUT: !entry:
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// CHECK:STDOUT: <elided>
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// CHECK:STDOUT: %a.ref: ref %empty_tuple.type = name_ref a, %a
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// CHECK:STDOUT: %b: ref %empty_tuple.type = alias_binding b, %a.ref
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// CHECK:STDOUT: <elided>
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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