91b90652bb
Initially added in #187709. It was reverted in #188833, because [llvm-clang-x86_64-sie-win](https://lab.llvm.org/buildbot/#/builders/46/builds/32873) was failing in `cross-project-tests/debuginfo-tests/dexter-tests/nrvo.cpp`. The test passed for me locally. After checking on another machine, I found that `S_DEFRANGE_REGISTER_REL_INDIR` is only supported by dbgeng/WinDbg from Windows 10.0 Build 19041 (released 2020) onwards. SDKs before this will fail to read the value. That buildbot is on Windows 10.0 Build 17763. I'm not sure if we should make the generation of that record conditional. Debuggers that can't read the record will skip it. They'll still see that there's some local variable, but won't be able to display the value. As far as I know, users of older Windows 10 builds should be able to install a newer Windows SDK and use the WinDbg from that version. But I haven't tested that.
151 lines
7.3 KiB
LLVM
151 lines
7.3 KiB
LLVM
; RUN: llc < %s | FileCheck %s --check-prefix=ASM
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; RUN: llc < %s -filetype=obj | llvm-readobj - --codeview | FileCheck %s --check-prefix=OBJ
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; C++ source to regenerate:
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; struct Foo {
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; Foo() = default;
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; Foo(Foo &&other) { x = other.x; }
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; int x;
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; };
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; void some_function(int);
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; Foo getFoo() {
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; Foo foo;
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; foo.x = 41;
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; some_function(foo.x);
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; return foo;
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; }
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;
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; int main() {
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; Foo bar = getFoo();
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; return bar.x;
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; }
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; $ clang t.cpp -S -emit-llvm -g -o t.ll
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; ASM-LABEL: .long 241 # Symbol subsection for GetFoo
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; ASM: .short 4414 # Record kind: S_LOCAL
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; ASM-NEXT: .long 4109 # TypeIndex
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; ASM-NEXT: .short 0 # Flags
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; ASM-NEXT: .asciz "foo"
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; ASM-NEXT: .p2align 2
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; ASM-NEXT: .Ltmp
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; ASM: .cv_def_range .Ltmp{{.*}} .Ltmp{{.*}}, reg_rel_indir, 335, 0, 40, 0
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; OBJ: Subsection [
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; OBJ: SubSectionType: Symbols (0xF1)
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; OBJ: LocalSym {
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; OBJ: Kind: S_LOCAL (0x113E)
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; OBJ: Type: Foo (0x100D)
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; OBJ: Flags [ (0x0)
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; OBJ: ]
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; OBJ: VarName: foo
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; OBJ: }
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; OBJ: DefRangeRegisterRelIndirSym {
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; OBJ: Kind: S_DEFRANGE_REGISTER_REL_INDIR (0x1177)
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; OBJ: BaseRegister: RSP (0x14F)
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; OBJ: HasSpilledUDTMember: No
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; OBJ: OffsetInParent: 0
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; OBJ: BasePointerOffset: 40
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; OBJ: OffsetInUDT: 0
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; OBJ: LocalVariableAddrRange {
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; OBJ: OffsetStart: .text+0x1D
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; OBJ: ISectStart: 0x0
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; OBJ: Range: 0x16
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; OBJ: }
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; OBJ: }
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; ModuleID = 't.cpp'
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source_filename = "t.cpp"
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target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-pc-windows-msvc19.16.27030"
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%struct.Foo = type { i32 }
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; Function Attrs: noinline nounwind optnone uwtable
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define dso_local void @"?some_function@@YAXH@Z"(i32) #0 !dbg !8 {
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entry:
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%.addr = alloca i32, align 4
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store i32 %0, ptr %.addr, align 4
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call void @llvm.dbg.declare(metadata ptr %.addr, metadata !12, metadata !DIExpression()), !dbg !13
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ret void, !dbg !13
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}
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; Function Attrs: nounwind readnone speculatable
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
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; Function Attrs: noinline nounwind optnone uwtable
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define dso_local void @"?GetFoo@@YA?AUFoo@@XZ"(ptr noalias sret(%struct.Foo) %agg.result) #0 !dbg !14 {
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entry:
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%result.ptr = alloca ptr, align 8
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%0 = bitcast ptr %agg.result to ptr
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store ptr %0, ptr %result.ptr, align 8
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call void @llvm.dbg.declare(metadata ptr %result.ptr, metadata !28, metadata !DIExpression(DW_OP_deref)), !dbg !29
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%x = getelementptr inbounds %struct.Foo, ptr %agg.result, i32 0, i32 0, !dbg !30
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store i32 41, ptr %x, align 4, !dbg !30
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%x1 = getelementptr inbounds %struct.Foo, ptr %agg.result, i32 0, i32 0, !dbg !31
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%1 = load i32, ptr %x1, align 4, !dbg !31
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call void @"?some_function@@YAXH@Z"(i32 %1), !dbg !31
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ret void, !dbg !32
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}
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; Function Attrs: noinline norecurse nounwind optnone uwtable
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define dso_local i32 @main() #2 !dbg !33 {
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entry:
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%retval = alloca i32, align 4
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%bar = alloca %struct.Foo, align 4
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store i32 0, ptr %retval, align 4
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call void @llvm.dbg.declare(metadata ptr %bar, metadata !36, metadata !DIExpression()), !dbg !37
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call void @"?GetFoo@@YA?AUFoo@@XZ"(ptr sret(%struct.Foo) %bar), !dbg !37
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%x = getelementptr inbounds %struct.Foo, ptr %bar, i32 0, i32 0, !dbg !38
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%0 = load i32, ptr %x, align 4, !dbg !38
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ret i32 %0, !dbg !38
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}
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attributes #0 = { noinline nounwind optnone uwtable "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "frame-pointer"="none" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "use-soft-float"="false" }
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attributes #1 = { nounwind readnone speculatable }
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attributes #2 = { noinline norecurse nounwind optnone uwtable "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "frame-pointer"="none" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "use-soft-float"="false" }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5, !6}
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!llvm.ident = !{!7}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 9.0.0 (https://github.com/llvm/llvm-project.git c19ebebac4bf853e77a69c74abe9f7fce98c1d17)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
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!1 = !DIFile(filename: "t.cpp", directory: "C:\5Csrc\5Ctesting\5Cnrvo", checksumkind: CSK_MD5, checksum: "52a5a20c02c102dfd255d5615680a8bd")
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!2 = !{}
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!3 = !{i32 2, !"CodeView", i32 1}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"wchar_size", i32 2}
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!6 = !{i32 7, !"PIC Level", i32 2}
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!7 = !{!"clang version 9.0.0 (https://github.com/llvm/llvm-project.git c19ebebac4bf853e77a69c74abe9f7fce98c1d17)"}
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!8 = distinct !DISubprogram(name: "some_function", linkageName: "?some_function@@YAXH@Z", scope: !1, file: !1, line: 13, type: !9, scopeLine: 13, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
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!9 = !DISubroutineType(types: !10)
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!10 = !{null, !11}
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!11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!12 = !DILocalVariable(arg: 1, scope: !8, file: !1, line: 13, type: !11)
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!13 = !DILocation(line: 13, scope: !8)
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!14 = distinct !DISubprogram(name: "GetFoo", linkageName: "?GetFoo@@YA?AUFoo@@XZ", scope: !1, file: !1, line: 15, type: !15, scopeLine: 15, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
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!15 = !DISubroutineType(types: !16)
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!16 = !{!17}
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!17 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "Foo", file: !1, line: 1, size: 32, flags: DIFlagTypePassByReference | DIFlagNonTrivial, elements: !18, identifier: ".?AUFoo@@")
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!18 = !{!19, !20, !24}
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!19 = !DIDerivedType(tag: DW_TAG_member, name: "x", scope: !17, file: !1, line: 4, baseType: !11, size: 32)
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!20 = !DISubprogram(name: "Foo", scope: !17, file: !1, line: 2, type: !21, scopeLine: 2, flags: DIFlagPrototyped, spFlags: 0)
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!21 = !DISubroutineType(types: !22)
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!22 = !{null, !23}
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!23 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !17, size: 64, flags: DIFlagArtificial | DIFlagObjectPointer)
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!24 = !DISubprogram(name: "Foo", scope: !17, file: !1, line: 3, type: !25, scopeLine: 3, flags: DIFlagPrototyped, spFlags: 0)
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!25 = !DISubroutineType(types: !26)
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!26 = !{null, !23, !27}
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!27 = !DIDerivedType(tag: DW_TAG_rvalue_reference_type, baseType: !17, size: 64)
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!28 = !DILocalVariable(name: "foo", scope: !14, file: !1, line: 17, type: !17)
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!29 = !DILocation(line: 17, scope: !14)
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!30 = !DILocation(line: 18, scope: !14)
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!31 = !DILocation(line: 19, scope: !14)
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!32 = !DILocation(line: 21, scope: !14)
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!33 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 23, type: !34, scopeLine: 23, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
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!34 = !DISubroutineType(types: !35)
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!35 = !{!11}
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!36 = !DILocalVariable(name: "bar", scope: !33, file: !1, line: 24, type: !17)
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!37 = !DILocation(line: 24, scope: !33)
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!38 = !DILocation(line: 25, scope: !33)
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