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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.
45 lines
1.6 KiB
Plaintext
45 lines
1.6 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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fn F() {}
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fn Run() {
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// CHECK:STDERR: fail_empty_tuple_access.carbon:[[@LINE+3]]:3: ERROR: Tuple element index `0` is past the end of type `()`.
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// CHECK:STDERR: F()[0];
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// CHECK:STDERR: ^~~~~~
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F()[0];
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}
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// CHECK:STDOUT: --- fail_empty_tuple_access.carbon
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// CHECK:STDOUT:
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// CHECK:STDOUT: constants {
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// CHECK:STDOUT: %.1: type = tuple_type () [template]
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// CHECK:STDOUT: %.2: i32 = int_literal 0 [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 {.F = %F, .Run = %Run} [template]
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// CHECK:STDOUT: %F: <function> = fn_decl @F [template]
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// CHECK:STDOUT: %Run: <function> = fn_decl @Run [template]
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @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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// CHECK:STDOUT: fn @Run() {
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// CHECK:STDOUT: !entry:
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// CHECK:STDOUT: %F.ref: <function> = name_ref F, file.%F [template = file.%F]
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// CHECK:STDOUT: %.loc13_4.1: init () = call %F.ref()
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// CHECK:STDOUT: %.loc13_7: i32 = int_literal 0 [template = constants.%.2]
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// CHECK:STDOUT: %.loc13_4.2: ref () = temporary_storage
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// CHECK:STDOUT: %.loc13_4.3: ref () = temporary %.loc13_4.2, %.loc13_4.1
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// CHECK:STDOUT: %.loc13_8: ref <error> = tuple_index %.loc13_4.3, <error>
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// CHECK:STDOUT: return
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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