mirror of
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.
77 lines
4.0 KiB
Plaintext
77 lines
4.0 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/int.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/function/generic/call_method.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/function/generic/call_method.carbon
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class C {
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fn F[self: Self, T:! Core.Copy](x: T) -> T {
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return x;
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}
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}
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fn CallF() -> i32 {
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var c: C = {};
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var n: i32 = 0;
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return c.F(n);
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}
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// CHECK:STDOUT: ; ModuleID = 'call_method.carbon'
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// CHECK:STDOUT: source_filename = "call_method.carbon"
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// CHECK:STDOUT:
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// CHECK:STDOUT: @C.val.loc20_3 = internal constant {} zeroinitializer
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// CHECK:STDOUT:
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// CHECK:STDOUT: define i32 @_CCallF.Main() !dbg !4 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: %c.var = alloca {}, align 8, !dbg !7
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// CHECK:STDOUT: %n.var = alloca i32, align 4, !dbg !8
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// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %c.var), !dbg !7
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// CHECK:STDOUT: call void @llvm.memcpy.p0.p0.i64(ptr align 1 %c.var, ptr align 1 @C.val.loc20_3, i64 0, i1 false), !dbg !7
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// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %n.var), !dbg !8
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// CHECK:STDOUT: store i32 0, ptr %n.var, align 4, !dbg !8
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// CHECK:STDOUT: %.loc22_14 = load i32, ptr %n.var, align 4, !dbg !9
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// CHECK:STDOUT: %C.F.call = call i32 @_CF.C.Main.b7c8e4dff2adcdaa(ptr %c.var, i32 %.loc22_14), !dbg !10
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// CHECK:STDOUT: ret i32 %C.F.call, !dbg !11
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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: ; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: readwrite)
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// CHECK:STDOUT: declare void @llvm.memcpy.p0.p0.i64(ptr noalias writeonly captures(none), ptr noalias readonly captures(none), i64, i1 immarg) #1
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// CHECK:STDOUT:
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// CHECK:STDOUT: define linkonce_odr i32 @_CF.C.Main.b7c8e4dff2adcdaa(ptr %self, i32 %x) !dbg !12 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: ret i32 %x, !dbg !13
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// CHECK:STDOUT: }
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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: attributes #1 = { nocallback nofree 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: "call_method.carbon", directory: "")
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// CHECK:STDOUT: !4 = distinct !DISubprogram(name: "CallF", linkageName: "_CCallF.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: 20, column: 3, scope: !4)
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// CHECK:STDOUT: !8 = !DILocation(line: 21, column: 3, scope: !4)
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// CHECK:STDOUT: !9 = !DILocation(line: 22, column: 14, scope: !4)
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// CHECK:STDOUT: !10 = !DILocation(line: 22, column: 10, scope: !4)
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// CHECK:STDOUT: !11 = !DILocation(line: 22, column: 3, scope: !4)
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// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "F", linkageName: "_CF.C.Main.b7c8e4dff2adcdaa", scope: null, file: !3, line: 14, type: !5, spFlags: DISPFlagDefinition, unit: !2)
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// CHECK:STDOUT: !13 = !DILocation(line: 15, column: 5, scope: !12)
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