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llvm-mirror/test/DebugInfo/X86/reference-argument.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

108 lines
7.5 KiB
LLVM
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; RUN: llc -mtriple=x86_64-apple-macosx10.9.0 -filetype=obj -O0 < %s \
; RUN: | llvm-dwarfdump -v -debug-info - | FileCheck %s
; ModuleID = 'aggregate-indirect-arg.cpp'
; extracted from debuginfo-tests/aggregate-indirect-arg.cpp
; v should be a pointer.
; CHECK: .debug_info contents:
; CHECK: DW_TAG_subprogram
; CHECK: DW_AT_specification {{.*}} "_ZN1A3fooE4SVal"
; CHECK-NOT: DW_TAG_subprogram
; CHECK: DW_TAG_formal_parameter
; CHECK: DW_AT_name {{.*}} "this"
; CHECK-NOT: DW_TAG_subprogram
; CHECK: DW_TAG_formal_parameter
; CHECK-NEXT: DW_AT_location {{.*}}(DW_OP_breg4 RSI+0)
; CHECK-NEXT: DW_AT_name {{.*}} "v"
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.9.0"
%class.SVal = type { i8*, i32 }
%class.A = type { i8 }
declare void @_Z3barR4SVal(%class.SVal* %v)
declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
declare void @llvm.dbg.value(metadata, metadata, metadata) #1
declare i32 @main()
; Function Attrs: nounwind ssp uwtable
define linkonce_odr void @_ZN1A3fooE4SVal(%class.A* %this, %class.SVal* %v) nounwind ssp uwtable align 2 !dbg !35 {
entry:
%this.addr = alloca %class.A*, align 8
store %class.A* %this, %class.A** %this.addr, align 8
call void @llvm.dbg.declare(metadata %class.A** %this.addr, metadata !59, metadata !DIExpression()), !dbg !61
call void @llvm.dbg.value(metadata %class.SVal* %v, metadata !62, metadata !DIExpression(DW_OP_deref)), !dbg !61
%this1 = load %class.A*, %class.A** %this.addr
call void @_Z3barR4SVal(%class.SVal* %v), !dbg !61
ret void, !dbg !61
}
declare void @_ZN4SValD1Ev(%class.SVal* %this)
declare void @_ZN4SValD2Ev(%class.SVal* %this)
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!47, !68}
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.4 ", isOptimized: false, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
!1 = !DIFile(filename: "aggregate-indirect-arg.cpp", directory: "")
!2 = !{}
!4 = distinct !DISubprogram(name: "bar", linkageName: "_Z3barR4SVal", line: 19, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 19, file: !1, scope: !5, type: !6, retainedNodes: !2)
!5 = !DIFile(filename: "aggregate-indirect-arg.cpp", directory: "")
!6 = !DISubroutineType(types: !7)
!7 = !{null, !8}
!8 = !DIDerivedType(tag: DW_TAG_reference_type, baseType: !9)
!9 = !DICompositeType(tag: DW_TAG_class_type, name: "SVal", line: 12, size: 128, align: 64, file: !1, elements: !10)
!10 = !{!11, !14, !16, !21, !23}
!11 = !DIDerivedType(tag: DW_TAG_member, name: "Data", line: 15, size: 64, align: 64, file: !1, scope: !9, baseType: !12)
!12 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !13)
!13 = !DIDerivedType(tag: DW_TAG_const_type, baseType: null)
!14 = !DIDerivedType(tag: DW_TAG_member, name: "Kind", line: 16, size: 32, align: 32, offset: 64, file: !1, scope: !9, baseType: !15)
!15 = !DIBasicType(tag: DW_TAG_base_type, name: "unsigned int", size: 32, align: 32, encoding: DW_ATE_unsigned)
!16 = !DISubprogram(name: "~SVal", line: 14, isLocal: false, isDefinition: false, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 14, file: !1, scope: !9, type: !17)
!17 = !DISubroutineType(types: !18)
!18 = !{null, !19}
!19 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, flags: DIFlagArtificial | DIFlagObjectPointer, baseType: !9)
!21 = !DISubprogram(name: "SVal", line: 12, isLocal: false, isDefinition: false, virtualIndex: 6, flags: DIFlagArtificial | DIFlagPrototyped, isOptimized: false, scopeLine: 12, file: !1, scope: !9, type: !17)
!23 = !DISubprogram(name: "SVal", line: 12, isLocal: false, isDefinition: false, virtualIndex: 6, flags: DIFlagArtificial | DIFlagPrototyped, isOptimized: false, scopeLine: 12, file: !1, scope: !9, type: !24)
!24 = !DISubroutineType(types: !25)
!25 = !{null, !19, !26}
!26 = !DIDerivedType(tag: DW_TAG_reference_type, baseType: !27)
!27 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !9)
!29 = distinct !DISubprogram(name: "main", line: 25, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 25, file: !1, scope: !5, type: !30, retainedNodes: !2)
!30 = !DISubroutineType(types: !31)
!31 = !{!32}
!32 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
!33 = distinct !DISubprogram(name: "~SVal", linkageName: "_ZN4SValD1Ev", line: 14, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 14, file: !1, scope: null, type: !17, declaration: !16, retainedNodes: !2)
!34 = distinct !DISubprogram(name: "~SVal", linkageName: "_ZN4SValD2Ev", line: 14, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 14, file: !1, scope: null, type: !17, declaration: !16, retainedNodes: !2)
!35 = distinct !DISubprogram(name: "foo", linkageName: "_ZN1A3fooE4SVal", line: 22, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 22, file: !1, scope: null, type: !36, declaration: !41, retainedNodes: !2)
!36 = !DISubroutineType(types: !37)
!37 = !{null, !38, !9}
!38 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, flags: DIFlagArtificial | DIFlagObjectPointer, baseType: !39)
!39 = !DICompositeType(tag: DW_TAG_class_type, name: "A", line: 20, size: 8, align: 8, file: !1, elements: !40)
!40 = !{!41, !43}
!41 = !DISubprogram(name: "foo", linkageName: "_ZN1A3fooE4SVal", line: 22, isLocal: false, isDefinition: false, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 22, file: !1, scope: !39, type: !36)
!43 = !DISubprogram(name: "A", line: 20, isLocal: false, isDefinition: false, virtualIndex: 6, flags: DIFlagArtificial | DIFlagPrototyped, isOptimized: false, scopeLine: 20, file: !1, scope: !39, type: !44)
!44 = !DISubroutineType(types: !45)
!45 = !{null, !38}
!47 = !{i32 2, !"Dwarf Version", i32 3}
!48 = !DILocalVariable(name: "v", line: 19, arg: 1, scope: !4, file: !5, type: !8)
!49 = !DILocation(line: 19, scope: !4)
!50 = !DILocalVariable(name: "v", line: 26, scope: !29, file: !5, type: !9)
!51 = !DILocation(line: 26, scope: !29)
!52 = !DILocation(line: 27, scope: !29)
!53 = !DILocation(line: 28, scope: !29)
!54 = !DILocalVariable(name: "a", line: 29, scope: !29, file: !5, type: !39)
!55 = !DILocation(line: 29, scope: !29)
!56 = !DILocation(line: 30, scope: !29)
!57 = !DILocation(line: 31, scope: !29)
!58 = !DILocation(line: 32, scope: !29)
!59 = !DILocalVariable(name: "this", line: 22, arg: 1, flags: DIFlagArtificial | DIFlagObjectPointer, scope: !35, file: !5, type: !60)
!60 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !39)
!61 = !DILocation(line: 22, scope: !35)
!62 = !DILocalVariable(name: "v", line: 22, arg: 2, scope: !35, file: !5, type: !9)
!63 = !DILocalVariable(name: "this", line: 14, arg: 1, flags: DIFlagArtificial | DIFlagObjectPointer, scope: !33, file: !5, type: !64)
!64 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !9)
!65 = !DILocation(line: 14, scope: !33)
!66 = !DILocalVariable(name: "this", line: 14, arg: 1, flags: DIFlagArtificial | DIFlagObjectPointer, scope: !34, file: !5, type: !64)
!67 = !DILocation(line: 14, scope: !34)
!68 = !{i32 1, !"Debug Info Version", i32 3}
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