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https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 22:02:23 +01:00
Richard Smith
d60900cbeb
When returning a value from a function whose return type has a by-copy initializing representation, perform initialization like we do when the return type has an in-place initializing representation. This makes our SemIR representation more uniform, as the return expression will now always be an initializing expression rather than a value expression, but more importantly it means that attempts to return a non-copyable type by value now fail, even if the type has a by-copy initializing representation. This catches a bunch of places where we were returning a value of an unconstrained template parameter `T:! type`, which we were incorrectly allowing because we didn't notice it was not copyable. Unfortunately this then requires quite a few test updates. Like #6034, this exposes a lowering issue where lowering crashes when attempting to lower a specific copy operation for certain types; a couple more tests are temporarily disabled here. An upcoming PR dependent on this one will fix the issue and re-enable those tests.
55 lines
2.4 KiB
Plaintext
55 lines
2.4 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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// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/convert.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/lower/testdata/interface/basic.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/lower/testdata/interface/basic.carbon
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interface I {
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fn Assoc();
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}
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// There are no interesting runtime operations here, but there's no rule saying
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// you can't pass a facet around at runtime, so make sure it works.
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fn F(T: I) {}
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fn G() -> I;
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fn H() -> I { return G(); }
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// CHECK:STDOUT: ; ModuleID = 'basic.carbon'
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// CHECK:STDOUT: source_filename = "basic.carbon"
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// CHECK:STDOUT:
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// CHECK:STDOUT: define void @_CF.Main({} %T) !dbg !4 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: ret void, !dbg !7
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: declare {} @_CG.Main()
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// CHECK:STDOUT:
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// CHECK:STDOUT: define {} @_CH.Main() !dbg !8 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: %G.call = call {} @_CG.Main(), !dbg !9
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// CHECK:STDOUT: ret {} %G.call, !dbg !10
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: !llvm.module.flags = !{!0, !1}
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// CHECK:STDOUT: !llvm.dbg.cu = !{!2}
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// CHECK:STDOUT:
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// CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
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// CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
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// CHECK:STDOUT: !2 = distinct !DICompileUnit(language: DW_LANG_C, file: !3, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
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// CHECK:STDOUT: !3 = !DIFile(filename: "basic.carbon", directory: "")
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// CHECK:STDOUT: !4 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main", scope: null, file: !3, line: 19, type: !5, spFlags: DISPFlagDefinition, unit: !2)
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// CHECK:STDOUT: !5 = !DISubroutineType(types: !6)
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// CHECK:STDOUT: !6 = !{}
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// CHECK:STDOUT: !7 = !DILocation(line: 19, column: 1, scope: !4)
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// CHECK:STDOUT: !8 = distinct !DISubprogram(name: "H", linkageName: "_CH.Main", scope: null, file: !3, line: 23, type: !5, spFlags: DISPFlagDefinition, unit: !2)
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// CHECK:STDOUT: !9 = !DILocation(line: 23, column: 22, scope: !8)
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// CHECK:STDOUT: !10 = !DILocation(line: 23, column: 15, scope: !8)
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