mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-10-05 22:02:55 +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.
93 lines
3.9 KiB
Plaintext
93 lines
3.9 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/lower/testdata/builtins/no_op.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/builtins/no_op.carbon
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fn NoOp() = "no_op";
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fn NoOp2(x: ()) -> () = "no_op";
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fn F() {
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NoOp();
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}
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fn G() -> () {
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var a: () = NoOp();
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return a;
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}
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fn H() -> () {
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return NoOp2(());
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}
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fn I();
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fn J() {
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NoOp2(I());
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}
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// CHECK:STDOUT: ; ModuleID = 'no_op.carbon'
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// CHECK:STDOUT: source_filename = "no_op.carbon"
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// CHECK:STDOUT:
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// CHECK:STDOUT: define void @_CF.Main() !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: define void @_CG.Main() !dbg !8 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: %a.var = alloca {}, align 8, !dbg !9
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// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %a.var), !dbg !9
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// CHECK:STDOUT: ret void, !dbg !10
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: define void @_CH.Main() !dbg !11 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: ret void, !dbg !12
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: declare void @_CI.Main()
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// CHECK:STDOUT:
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// CHECK:STDOUT: define void @_CJ.Main() !dbg !13 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: %.loc33_11.1.temp = alloca {}, align 8, !dbg !14
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// CHECK:STDOUT: call void @_CI.Main(), !dbg !14
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// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc33_11.1.temp), !dbg !14
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// CHECK:STDOUT: ret void, !dbg !15
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
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// CHECK:STDOUT: declare void @llvm.lifetime.start.p0(ptr captures(none)) #0
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; uselistorder directives
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// CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 1, 0 }
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// CHECK:STDOUT:
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// CHECK:STDOUT: attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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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: "no_op.carbon", directory: "")
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// CHECK:STDOUT: !4 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main", scope: null, file: !3, line: 17, 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: 17, column: 1, scope: !4)
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// CHECK:STDOUT: !8 = distinct !DISubprogram(name: "G", linkageName: "_CG.Main", scope: null, file: !3, line: 21, type: !5, spFlags: DISPFlagDefinition, unit: !2)
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// CHECK:STDOUT: !9 = !DILocation(line: 22, column: 3, scope: !8)
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// CHECK:STDOUT: !10 = !DILocation(line: 23, column: 3, scope: !8)
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// CHECK:STDOUT: !11 = distinct !DISubprogram(name: "H", linkageName: "_CH.Main", scope: null, file: !3, line: 26, type: !5, spFlags: DISPFlagDefinition, unit: !2)
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// CHECK:STDOUT: !12 = !DILocation(line: 27, column: 3, scope: !11)
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// CHECK:STDOUT: !13 = distinct !DISubprogram(name: "J", linkageName: "_CJ.Main", scope: null, file: !3, line: 32, type: !5, spFlags: DISPFlagDefinition, unit: !2)
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// CHECK:STDOUT: !14 = !DILocation(line: 33, column: 9, scope: !13)
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// CHECK:STDOUT: !15 = !DILocation(line: 32, column: 1, scope: !13)
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