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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.
44 lines
1.4 KiB
Plaintext
44 lines
1.4 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 Echo(a: i32) -> i32 {
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return a;
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}
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fn Main() {
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var b: i32 = Echo(1);
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}
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// CHECK:STDOUT: --- i32.carbon
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// CHECK:STDOUT:
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// CHECK:STDOUT: constants {
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// CHECK:STDOUT: %.1: i32 = int_literal 1 [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 {.Echo = %Echo, .Main = %Main} [template]
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// CHECK:STDOUT: %Echo: <function> = fn_decl @Echo [template]
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// CHECK:STDOUT: %Main: <function> = fn_decl @Main [template]
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @Echo(%a: i32) -> i32 {
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// CHECK:STDOUT: !entry:
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// CHECK:STDOUT: %a.ref: i32 = name_ref a, %a
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// CHECK:STDOUT: return %a.ref
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @Main() {
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// CHECK:STDOUT: !entry:
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// CHECK:STDOUT: %b.var: ref i32 = var b
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// CHECK:STDOUT: %b: ref i32 = bind_name b, %b.var
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// CHECK:STDOUT: %Echo.ref: <function> = name_ref Echo, file.%Echo [template = file.%Echo]
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// CHECK:STDOUT: %.loc12_21: i32 = int_literal 1 [template = constants.%.1]
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// CHECK:STDOUT: %.loc12_20: init i32 = call %Echo.ref(%.loc12_21)
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// CHECK:STDOUT: assign %b.var, %.loc12_20
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// CHECK:STDOUT: return
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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