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llvm-mirror/test/DebugInfo/X86/this-stack_value.ll
Shiva Chen a2029fa58e [DebugInfo] Add DILabel metadata and intrinsic llvm.dbg.label. 
In order to set breakpoints on labels and list source code around
labels, we need collect debug information for labels, i.e., label
name, the function label belong, line number in the file, and the
address label located. In order to keep these information in LLVM
IR and to allow backend to generate debug information correctly.
We create a new kind of metadata for labels, DILabel. The format
of DILabel is

!DILabel(scope: !1, name: "foo", file: !2, line: 3)

We hope to keep debug information as much as possible even the
code is optimized. So, we create a new kind of intrinsic for label
metadata to avoid the metadata is eliminated with basic block.
The intrinsic will keep existing if we keep it from optimized out.
The format of the intrinsic is

llvm.dbg.label(metadata !1)

It has only one argument, that is the DILabel metadata. The
intrinsic will follow the label immediately. Backend could get the
label metadata through the intrinsic's parameter.

We also create DIBuilder API for labels to be used by Frontend.
Frontend could use createLabel() to allocate DILabel objects, and use
insertLabel() to insert llvm.dbg.label intrinsic in LLVM IR.

Differential Revision: https://reviews.llvm.org/D45024

Patch by Hsiangkai Wang.

llvm-svn: 331841
2018-05-09 02:40:45 +00:00

124 lines
7.0 KiB
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; RUN: llc -filetype=asm -o - %s | FileCheck %s --check-prefix=ASM
; RUN: llc -filetype=obj -o - %s | llvm-dwarfdump -v --debug-info - | FileCheck %s
;
; Generated at -O2 from:
; struct B;
; class A {
; int a1 = 23;
; int a2 = 42;
; };
; struct B {
; A a;
; int b = 48;
; };
;
; B *getB() { return new B(); }
;
; The inlined A::this pointer has the same location as B::this, but it may not be
; modified by the debugger.
;
; ASM: [DW_OP_stack_value]
; CHECK: DW_AT_location {{.*}} (DW_OP_breg0 RAX+0, DW_OP_stack_value)
source_filename = "ab.cpp"
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.12.0"
%struct.B = type { %class.A, i32 }
%class.A = type { i32, i32 }
; Function Attrs: ssp uwtable
define noalias nonnull %struct.B* @_Z4getBv() local_unnamed_addr #0 !dbg !7 {
entry:
%call = tail call i8* @_Znwm(i64 12) #3, !dbg !20
%0 = bitcast i8* %call to %struct.B*, !dbg !20
tail call void @llvm.dbg.value(metadata %struct.B* %0, metadata !21, metadata !28), !dbg !29
tail call void @llvm.dbg.value(metadata %struct.B* %0, metadata !31, metadata !28), !dbg !34
tail call void @llvm.dbg.value(metadata %struct.B* %0, metadata !36, metadata !44), !dbg !45
tail call void @llvm.dbg.value(metadata %struct.B* %0, metadata !47, metadata !44), !dbg !50
%a1.i.i.i.i = bitcast i8* %call to i32*, !dbg !52
store i32 23, i32* %a1.i.i.i.i, align 4, !dbg !52, !tbaa !53
%a2.i.i.i.i = getelementptr inbounds i8, i8* %call, i64 4, !dbg !58
%1 = bitcast i8* %a2.i.i.i.i to i32*, !dbg !58
store i32 42, i32* %1, align 4, !dbg !58, !tbaa !59
%b.i.i = getelementptr inbounds i8, i8* %call, i64 8, !dbg !60
%2 = bitcast i8* %b.i.i to i32*, !dbg !60
store i32 48, i32* %2, align 4, !dbg !60, !tbaa !61
ret %struct.B* %0, !dbg !63
}
declare noalias nonnull i8* @_Znwm(i64) local_unnamed_addr #1
declare void @llvm.dbg.value(metadata, metadata, metadata) #2
attributes #0 = { ssp uwtable }
attributes #1 = { nobuiltin }
attributes #2 = { nounwind readnone }
attributes #3 = { builtin }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4, !5}
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 5.0.0 (trunk 301093) (llvm/trunk 301093)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
!1 = !DIFile(filename: "ab.cpp", directory: "/")
!2 = !{}
!3 = !{i32 2, !"Dwarf Version", i32 4}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = !{i32 1, !"PIC Level", i32 2}
!7 = distinct !DISubprogram(name: "getB", linkageName: "_Z4getBv", scope: !1, file: !1, line: 11, type: !8, isLocal: false, isDefinition: true, scopeLine: 11, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !2)
!8 = !DISubroutineType(types: !9)
!9 = !{!10}
!10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !11, size: 64)
!11 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "B", file: !1, line: 6, size: 96, elements: !12, identifier: "_ZTS1B")
!12 = !{!13, !19}
!13 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !11, file: !1, line: 7, baseType: !14, size: 64)
!14 = distinct !DICompositeType(tag: DW_TAG_class_type, name: "A", file: !1, line: 2, size: 64, elements: !15, identifier: "_ZTS1A")
!15 = !{!16, !18}
!16 = !DIDerivedType(tag: DW_TAG_member, name: "a1", scope: !14, file: !1, line: 3, baseType: !17, size: 32)
!17 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!18 = !DIDerivedType(tag: DW_TAG_member, name: "a2", scope: !14, file: !1, line: 4, baseType: !17, size: 32, offset: 32)
!19 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !11, file: !1, line: 8, baseType: !17, size: 32, offset: 64)
!20 = !DILocation(line: 11, column: 20, scope: !7)
!21 = !DILocalVariable(name: "this", arg: 1, scope: !22, type: !10, flags: DIFlagArtificial | DIFlagObjectPointer)
!22 = distinct !DISubprogram(name: "B", linkageName: "_ZN1BC1Ev", scope: !11, file: !1, line: 6, type: !23, isLocal: false, isDefinition: true, scopeLine: 6, flags: DIFlagArtificial | DIFlagPrototyped, isOptimized: true, unit: !0, declaration: !26, retainedNodes: !27)
!23 = !DISubroutineType(types: !24)
!24 = !{null, !25}
!25 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !11, size: 64, flags: DIFlagArtificial | DIFlagObjectPointer)
!26 = !DISubprogram(name: "B", scope: !11, type: !23, isLocal: false, isDefinition: false, flags: DIFlagArtificial | DIFlagPrototyped, isOptimized: true)
!27 = !{!21}
!28 = !DIExpression()
!29 = !DILocation(line: 0, scope: !22, inlinedAt: !30)
!30 = distinct !DILocation(line: 11, column: 24, scope: !7)
!31 = !DILocalVariable(name: "this", arg: 1, scope: !32, type: !10, flags: DIFlagArtificial | DIFlagObjectPointer)
!32 = distinct !DISubprogram(name: "B", linkageName: "_ZN1BC2Ev", scope: !11, file: !1, line: 6, type: !23, isLocal: false, isDefinition: true, scopeLine: 6, flags: DIFlagArtificial | DIFlagPrototyped, isOptimized: true, unit: !0, declaration: !26, retainedNodes: !33)
!33 = !{!31}
!34 = !DILocation(line: 0, scope: !32, inlinedAt: !35)
!35 = distinct !DILocation(line: 6, column: 8, scope: !22, inlinedAt: !30)
!36 = !DILocalVariable(name: "this", arg: 1, scope: !37, type: !43, flags: DIFlagArtificial | DIFlagObjectPointer)
!37 = distinct !DISubprogram(name: "A", linkageName: "_ZN1AC1Ev", scope: !14, file: !1, line: 2, type: !38, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagArtificial | DIFlagPrototyped, isOptimized: true, unit: !0, declaration: !41, retainedNodes: !42)
!38 = !DISubroutineType(types: !39)
!39 = !{null, !40}
!40 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !14, size: 64, flags: DIFlagArtificial | DIFlagObjectPointer)
!41 = !DISubprogram(name: "A", scope: !14, type: !38, isLocal: false, isDefinition: false, flags: DIFlagPublic | DIFlagArtificial | DIFlagPrototyped, isOptimized: true)
!42 = !{!36}
!43 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !14, size: 64)
!44 = !DIExpression(DW_OP_stack_value)
!45 = !DILocation(line: 0, scope: !37, inlinedAt: !46)
!46 = distinct !DILocation(line: 6, column: 8, scope: !32, inlinedAt: !35)
!47 = !DILocalVariable(name: "this", arg: 1, scope: !48, type: !43, flags: DIFlagArtificial | DIFlagObjectPointer)
!48 = distinct !DISubprogram(name: "A", linkageName: "_ZN1AC2Ev", scope: !14, file: !1, line: 2, type: !38, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagArtificial | DIFlagPrototyped, isOptimized: true, unit: !0, declaration: !41, retainedNodes: !49)
!49 = !{!47}
!50 = !DILocation(line: 0, scope: !48, inlinedAt: !51)
!51 = distinct !DILocation(line: 2, column: 7, scope: !37, inlinedAt: !46)
!52 = !DILocation(line: 3, column: 7, scope: !48, inlinedAt: !51)
!53 = !{!54, !55, i64 0}
!54 = !{!"_ZTS1A", !55, i64 0, !55, i64 4}
!55 = !{!"int", !56, i64 0}
!56 = !{!"omnipotent char", !57, i64 0}
!57 = !{!"Simple C++ TBAA"}
!58 = !DILocation(line: 4, column: 7, scope: !48, inlinedAt: !51)
!59 = !{!54, !55, i64 4}
!60 = !DILocation(line: 8, column: 7, scope: !32, inlinedAt: !35)
!61 = !{!62, !55, i64 8}
!62 = !{!"_ZTS1B", !54, i64 0, !55, i64 8}
!63 = !DILocation(line: 11, column: 13, scope: !7)
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