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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.
38 lines
1.7 KiB
Plaintext
38 lines
1.7 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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var x: {} = {};
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var y: {} = x;
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// CHECK:STDOUT: --- empty.carbon
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// CHECK:STDOUT:
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// CHECK:STDOUT: constants {
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// CHECK:STDOUT: %.1: type = struct_type {} [template]
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// CHECK:STDOUT: %.2: type = tuple_type () [template]
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// CHECK:STDOUT: %.3: {} = struct_value () [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 {.x = %x, .y = %y} [template]
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// CHECK:STDOUT: %.loc7_9.1: {} = struct_literal ()
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// CHECK:STDOUT: %.loc7_9.2: type = converted %.loc7_9.1, constants.%.1 [template = constants.%.1]
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// CHECK:STDOUT: %x.var: ref {} = var x
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// CHECK:STDOUT: %x: ref {} = bind_name x, %x.var
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// CHECK:STDOUT: %.loc7_14.1: {} = struct_literal ()
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// CHECK:STDOUT: %.loc7_14.2: init {} = struct_init () to %x.var [template = constants.%.3]
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// CHECK:STDOUT: %.loc7_14.3: init {} = converted %.loc7_14.1, %.loc7_14.2 [template = constants.%.3]
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// CHECK:STDOUT: assign %x.var, %.loc7_14.3
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// CHECK:STDOUT: %.loc8_9.1: {} = struct_literal ()
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// CHECK:STDOUT: %.loc8_9.2: type = converted %.loc8_9.1, constants.%.1 [template = constants.%.1]
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// CHECK:STDOUT: %y.var: ref {} = var y
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// CHECK:STDOUT: %y: ref {} = bind_name y, %y.var
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// CHECK:STDOUT: %x.ref: ref {} = name_ref x, %x
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// CHECK:STDOUT: %.loc8_13.1: init {} = struct_init () to %y.var [template = constants.%.3]
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// CHECK:STDOUT: %.loc8_13.2: init {} = converted %x.ref, %.loc8_13.1 [template = constants.%.3]
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// CHECK:STDOUT: assign %y.var, %.loc8_13.2
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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