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carbon-lang/toolchain/lower/testdata/function/generic/call_basic_depth.carbon
T
Christopher Di Bella 05a7ecbd34 Move SubobjectDestroy and SelfDestruct out of interface Destroy (#7942) 
Determining that a type has trivial destruction requires checking
whether all of its subobjects have trivial destruction and whether its
type has a custom witness for `Destroy.Op`. This isn't possible when
`Destroy` is the custodian for `Destroy.Op` and `SubobjectDestroy.Op`,
so we need to make `SubobjectDestroy` its own interface.

`Destroy.SelfDestruct` becomes a standalone function because it depends
on `SubobjectDestroy` and `Destroy` being implemented, and is also
responsible for generating any custom witnesses for both interfaces.
Making `SelfDestruct` an interface was experimented with, but this
required a blanket impl that caused issues for facet types.

`Destroy` depends on `SubobjectDestroy` to be implemented. We'd ideally
use `require impls SubobjectDestroy`, but it isn't complete yet, and it
also causes problems when `Destroy` is implemented inside the class
definition. We work around this by temporarily renaming the `Destroy`
interface to `DestroyImpl`, and introducing a constraint called
`Destroy` so that user code doesn't need to write `Core.SubobjectDestroy
& Core.Destroy`.
2026-10-26 21:35:01 +00:00

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// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/int.carbon
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/lower/testdata/function/generic/call_basic_depth.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/function/generic/call_basic_depth.carbon
// Builds on `call_basic.carbon`. Checks definitions are emitted with deeper
// call stack, i.e., when functions can be type checked without looking at the
// specific calling context.
fn F[T: type](_: T) {
}
fn H[T: Core.Copy](x: T) -> T {
F(x);
return x;
}
fn G[T: Core.Copy & Core.Destroy](x: T) -> T {
H(x);
F(x);
return x;
}
fn M() -> i32 {
var n: i32 = 0;
var m: i32;
F(n);
m = G(n);
return m;
}
// CHECK:STDOUT: ; ---
// CHECK:STDOUT: ; ModuleID = 'call_basic_depth.carbon'
// CHECK:STDOUT: source_filename = "call_basic_depth.carbon"
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define i32 @_CM.Main() #0 !dbg !23 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %n.var = alloca i32, align 4, !dbg !26
// CHECK:STDOUT: %m.var = alloca i32, align 4, !dbg !28
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %n.var), !dbg !26
// CHECK:STDOUT: store i32 0, ptr %n.var, align 4, !dbg !26
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %m.var), !dbg !28
// CHECK:STDOUT: store i32 poison, ptr %m.var, align 4, !dbg !28
// CHECK:STDOUT: %.loc34 = load i32, ptr %n.var, align 4, !dbg !30
// CHECK:STDOUT: call void @_CF.Main.55456748a8a2eb70(i32 %.loc34), !dbg !31
// CHECK:STDOUT: %.loc35_9 = load i32, ptr %n.var, align 4, !dbg !35
// CHECK:STDOUT: %G.call = call i32 @_CG.Main.091764f9509e9823(i32 %.loc35_9), !dbg !36
// CHECK:STDOUT: store i32 %G.call, ptr %m.var, align 4, !dbg !34
// CHECK:STDOUT: %.loc36 = load i32, ptr %m.var, align 4, !dbg !39
// CHECK:STDOUT: call void @_CSelfDestruct.Core.f127f30143696d51(ptr %m.var), !dbg !28
// CHECK:STDOUT: call void @_CSelfDestruct.Core.f127f30143696d51(ptr %n.var), !dbg !26
// CHECK:STDOUT: ret i32 %.loc36, !dbg !40
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
// CHECK:STDOUT: declare void @llvm.lifetime.start.p0(ptr captures(none)) #1
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr void @_CF.Main.55456748a8a2eb70(i32 %_) #0 !dbg !41 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !44
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr i32 @_CG.Main.091764f9509e9823(i32 %x) #0 !dbg !46 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc25_6.3.temp = alloca i32, align 4, !dbg !52
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc25_6.3.temp), !dbg !52
// CHECK:STDOUT: %H.call = call i32 @_CH.Main.2fad9574e050607e(i32 %x), !dbg !52
// CHECK:STDOUT: store i32 %H.call, ptr %.loc25_6.3.temp, align 4, !dbg !52
// CHECK:STDOUT: call void @_CSelfDestruct.Core.f127f30143696d51(ptr %.loc25_6.3.temp), !dbg !52
// CHECK:STDOUT: call void @_CF.Main.55456748a8a2eb70(i32 %x), !dbg !54
// CHECK:STDOUT: ret i32 %x, !dbg !56
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr void @_CSelfDestruct.Core.f127f30143696d51(ptr %t) #0 !dbg !58 {
// CHECK:STDOUT: ret void, !dbg !63
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr i32 @_CH.Main.2fad9574e050607e(i32 %x) #0 !dbg !65 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @_CF.Main.55456748a8a2eb70(i32 %x), !dbg !71
// CHECK:STDOUT: ret i32 %x, !dbg !73
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; uselistorder directives
// CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 0, 2, 1 }
// CHECK:STDOUT: uselistorder ptr @_CSelfDestruct.Core.f127f30143696d51, { 2, 1, 0 }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { nounwind }
// CHECK:STDOUT: attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.dbg.cu = !{!19}
// CHECK:STDOUT: !llvm.module.flags = !{!2, !3}
// CHECK:STDOUT:
// CHECK:STDOUT: !2 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !3 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !10 = !DIFile(filename: "min_prelude/parts/destroy.carbon", directory: "")
// CHECK:STDOUT: !18 = !DIFile(filename: "call_basic_depth.carbon", directory: "")
// CHECK:STDOUT: !19 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !18, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !20 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
// CHECK:STDOUT: !21 = !{!20}
// CHECK:STDOUT: !22 = !DISubroutineType(types: !21)
// CHECK:STDOUT: !23 = distinct !DISubprogram(name: "M", linkageName: "_CM.Main", scope: null, file: !18, line: 30, type: !22, spFlags: DISPFlagDefinition, unit: !19)
// CHECK:STDOUT: !26 = !DILocation(line: 31, column: 3, scope: !23)
// CHECK:STDOUT: !28 = !DILocation(line: 32, column: 3, scope: !23)
// CHECK:STDOUT: !30 = !DILocation(line: 34, column: 5, scope: !23)
// CHECK:STDOUT: !31 = !DILocation(line: 34, column: 3, scope: !23)
// CHECK:STDOUT: !32 = !{null, !20}
// CHECK:STDOUT: !33 = !DISubroutineType(types: !32)
// CHECK:STDOUT: !34 = !DILocation(line: 35, column: 3, scope: !23)
// CHECK:STDOUT: !35 = !DILocation(line: 35, column: 9, scope: !23)
// CHECK:STDOUT: !36 = !DILocation(line: 35, column: 7, scope: !23)
// CHECK:STDOUT: !37 = !{!20, !20}
// CHECK:STDOUT: !38 = !DISubroutineType(types: !37)
// CHECK:STDOUT: !39 = !DILocation(line: 36, column: 10, scope: !23)
// CHECK:STDOUT: !40 = !DILocation(line: 36, column: 3, scope: !23)
// CHECK:STDOUT: !41 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main.55456748a8a2eb70", scope: null, file: !18, line: 16, type: !33, spFlags: DISPFlagDefinition, unit: !19, retainedNodes: !45)
// CHECK:STDOUT: !42 = !DILocalVariable(arg: 1, scope: !41, type: !20)
// CHECK:STDOUT: !44 = !DILocation(line: 16, column: 1, scope: !41)
// CHECK:STDOUT: !45 = !{!42}
// CHECK:STDOUT: !46 = distinct !DISubprogram(name: "G", linkageName: "_CG.Main.091764f9509e9823", scope: null, file: !18, line: 24, type: !38, spFlags: DISPFlagDefinition, unit: !19, retainedNodes: !57)
// CHECK:STDOUT: !47 = !DILocalVariable(arg: 1, scope: !46, type: !20)
// CHECK:STDOUT: !52 = !DILocation(line: 25, column: 3, scope: !46)
// CHECK:STDOUT: !54 = !DILocation(line: 26, column: 3, scope: !46)
// CHECK:STDOUT: !56 = !DILocation(line: 27, column: 3, scope: !46)
// CHECK:STDOUT: !57 = !{!47}
// CHECK:STDOUT: !58 = distinct !DISubprogram(name: "SelfDestruct", linkageName: "_CSelfDestruct.Core.f127f30143696d51", scope: null, file: !10, line: 32, type: !33, spFlags: DISPFlagDefinition, unit: !19, retainedNodes: !64)
// CHECK:STDOUT: !59 = !DILocalVariable(arg: 1, scope: !58, type: !20)
// CHECK:STDOUT: !63 = !DILocation(line: 32, column: 1, scope: !58)
// CHECK:STDOUT: !64 = !{!59}
// CHECK:STDOUT: !65 = distinct !DISubprogram(name: "H", linkageName: "_CH.Main.2fad9574e050607e", scope: null, file: !18, line: 19, type: !38, spFlags: DISPFlagDefinition, unit: !19, retainedNodes: !74)
// CHECK:STDOUT: !66 = !DILocalVariable(arg: 1, scope: !65, type: !20)
// CHECK:STDOUT: !71 = !DILocation(line: 20, column: 3, scope: !65)
// CHECK:STDOUT: !73 = !DILocation(line: 21, column: 3, scope: !65)
// CHECK:STDOUT: !74 = !{!66}
// CHECK:STDOUT:
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