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llvm-project/llvm/test/CodeGen/AArch64/GlobalISel/debug-cpp.ll

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[GlobalISel] Lower dbg.declare into indirect DBG_VALUE Summary: D31439 changed the semantics of dbg.declare to take the address of a variable as the first argument, making it indirect. It specifically updated FastISel for this change here: https://reviews.llvm.org/D31439#change-WVArzi177jPl GlobalISel needs to follow suit, or else it will be missing a level of indirection in the generated debuginfo. This problem was seen in a Rust debuginfo test on aarch64, since GlobalISel is used at -O0 for aarch64. https://github.com/rust-lang/rust/issues/49807 https://bugzilla.redhat.com/show_bug.cgi?id=1611597 https://bugzilla.redhat.com/show_bug.cgi?id=1625768 Reviewers: dblaikie, aprantl, t.p.northover, javed.absar, rnk Reviewed By: rnk Subscribers: #debug-info, rovka, kristof.beyls, JDevlieghere, llvm-commits, tstellar Differential Revision: https://reviews.llvm.org/D51749 llvm-svn: 341969
2018-09-12 01:52:01 +08:00
; RUN: llc -global-isel -mtriple=aarch64 %s -stop-after=irtranslator -o - | FileCheck %s
; RUN: llc -mtriple=aarch64 -global-isel --global-isel-abort=0 -o /dev/null
; struct NTCopy {
; NTCopy();
; NTCopy(const NTCopy &);
; int x;
; };
; int foo(NTCopy o) {
; return o.x;
; }
; ModuleID = 'ntcopy.cpp'
source_filename = "ntcopy.cpp"
target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
target triple = "aarch64-unknown-linux-gnu"
%struct.NTCopy = type { i32 }
; CHECK-LABEL: name: _Z3foo6NTCopy
MachineOperand/MIParser: Do not print debug-use flag, infer it The debug-use flag must be set exactly for uses on DBG_VALUEs. This is so obvious that it can be trivially inferred while parsing. This will reduce noise when printing while omitting an information that has little value to the user. The parser will keep recognizing the flag for compatibility with old `.mir` files. Differential Revision: https://reviews.llvm.org/D53903 llvm-svn: 345671
2018-10-31 07:28:27 +08:00
; CHECK: DBG_VALUE %{{[0-9]+}}(p0), 0, !23, !DIExpression(), debug-location !24
[GlobalISel] Lower dbg.declare into indirect DBG_VALUE Summary: D31439 changed the semantics of dbg.declare to take the address of a variable as the first argument, making it indirect. It specifically updated FastISel for this change here: https://reviews.llvm.org/D31439#change-WVArzi177jPl GlobalISel needs to follow suit, or else it will be missing a level of indirection in the generated debuginfo. This problem was seen in a Rust debuginfo test on aarch64, since GlobalISel is used at -O0 for aarch64. https://github.com/rust-lang/rust/issues/49807 https://bugzilla.redhat.com/show_bug.cgi?id=1611597 https://bugzilla.redhat.com/show_bug.cgi?id=1625768 Reviewers: dblaikie, aprantl, t.p.northover, javed.absar, rnk Reviewed By: rnk Subscribers: #debug-info, rovka, kristof.beyls, JDevlieghere, llvm-commits, tstellar Differential Revision: https://reviews.llvm.org/D51749 llvm-svn: 341969
2018-09-12 01:52:01 +08:00
; Function Attrs: noinline nounwind optnone
define dso_local i32 @_Z3foo6NTCopy(%struct.NTCopy* %o) #0 !dbg !7 {
entry:
call void @llvm.dbg.declare(metadata %struct.NTCopy* %o, metadata !23, metadata !DIExpression()), !dbg !24
%x = getelementptr inbounds %struct.NTCopy, %struct.NTCopy* %o, i32 0, i32 0, !dbg !25
%0 = load i32, i32* %x, align 4, !dbg !25
ret i32 %0, !dbg !26
}
; Function Attrs: nounwind readnone speculatable
declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
attributes #0 = { noinline nounwind optnone }
attributes #1 = { nounwind readnone speculatable }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4, !5}
!llvm.ident = !{!6}
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 8.0.0 ", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
!1 = !DIFile(filename: "ntcopy.cpp", directory: "/tmp")
!2 = !{}
!3 = !{i32 2, !"Dwarf Version", i32 4}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = !{i32 1, !"wchar_size", i32 4}
!6 = !{!"clang version 8.0.0 "}
!7 = distinct !DISubprogram(name: "foo", linkageName: "_Z3foo6NTCopy", scope: !1, file: !1, line: 6, type: !8, isLocal: false, isDefinition: true, scopeLine: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
!8 = !DISubroutineType(types: !9)
!9 = !{!10, !11}
!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!11 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "NTCopy", file: !1, line: 1, size: 32, flags: DIFlagTypePassByReference, elements: !12, identifier: "_ZTS6NTCopy")
!12 = !{!13, !14, !18}
!13 = !DIDerivedType(tag: DW_TAG_member, name: "x", scope: !11, file: !1, line: 4, baseType: !10, size: 32)
!14 = !DISubprogram(name: "NTCopy", scope: !11, file: !1, line: 2, type: !15, isLocal: false, isDefinition: false, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: false)
!15 = !DISubroutineType(types: !16)
!16 = !{null, !17}
!17 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !11, size: 64, flags: DIFlagArtificial | DIFlagObjectPointer)
!18 = !DISubprogram(name: "NTCopy", scope: !11, file: !1, line: 3, type: !19, isLocal: false, isDefinition: false, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: false)
!19 = !DISubroutineType(types: !20)
!20 = !{null, !17, !21}
!21 = !DIDerivedType(tag: DW_TAG_reference_type, baseType: !22, size: 64)
!22 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !11)
!23 = !DILocalVariable(name: "o", arg: 1, scope: !7, file: !1, line: 6, type: !11)
!24 = !DILocation(line: 6, column: 16, scope: !7)
!25 = !DILocation(line: 7, column: 12, scope: !7)
!26 = !DILocation(line: 7, column: 3, scope: !7)