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llvm-mirror/test/CodeGen/ARM/2011-01-19-MergedGlobalDbg.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

141 lines
7.2 KiB
LLVM
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; RUN: llc -arm-global-merge -global-merge-group-by-use=false -filetype=obj < %s | llvm-dwarfdump -debug-info -v - | FileCheck %s
source_filename = "test/CodeGen/ARM/2011-01-19-MergedGlobalDbg.ll"
target datalayout = "e-p:32:32:32-i1:8:32-i8:8:32-i16:16:32-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:32:64-v128:32:128-a0:0:32-n32"
target triple = "thumbv7-apple-darwin10"
@x1 = internal global i8 1, align 1, !dbg !0
@x2 = internal global i8 1, align 1, !dbg !4
@x3 = internal global i8 1, align 1, !dbg !6
@x4 = internal global i8 1, align 1, !dbg !8
@x5 = global i8 1, align 1, !dbg !10
; CHECK: DW_TAG_variable
; CHECK-NOT: DW_TAG
; CHECK: DW_AT_name {{.*}} "x1"
; CHECK-NOT: {{DW_TAG|NULL}}
; CHECK: DW_AT_location [DW_FORM_exprloc] (DW_OP_addr [[ADDR:0x[0-9a-fA-F]+]])
; CHECK: DW_TAG_variable
; CHECK-NOT: DW_TAG
; CHECK: DW_AT_name {{.*}} "x2"
; CHECK-NOT: {{DW_TAG|NULL}}
; CHECK: DW_AT_location [DW_FORM_exprloc] (DW_OP_addr [[ADDR]], DW_OP_plus_uconst 0x1)
; Function Attrs: nounwind optsize
define zeroext i8 @get1(i8 zeroext %a) #0 !dbg !16 {
entry:
tail call void @llvm.dbg.value(metadata i8 %a, metadata !20, metadata !23), !dbg !24
%0 = load i8, i8* @x1, align 4, !dbg !24
tail call void @llvm.dbg.value(metadata i8 %0, metadata !21, metadata !23), !dbg !24
store i8 %a, i8* @x1, align 4, !dbg !24
ret i8 %0, !dbg !25
}
; Function Attrs: nounwind readnone
declare void @llvm.dbg.value(metadata, metadata, metadata) #1
; Function Attrs: nounwind optsize
define zeroext i8 @get2(i8 zeroext %a) #0 !dbg !26 {
entry:
tail call void @llvm.dbg.value(metadata i8 %a, metadata !28, metadata !23), !dbg !31
%0 = load i8, i8* @x2, align 4, !dbg !31
tail call void @llvm.dbg.value(metadata i8 %0, metadata !29, metadata !23), !dbg !31
store i8 %a, i8* @x2, align 4, !dbg !31
ret i8 %0, !dbg !32
}
; Function Attrs: nounwind optsize
define zeroext i8 @get3(i8 zeroext %a) #0 !dbg !33 {
entry:
tail call void @llvm.dbg.value(metadata i8 %a, metadata !35, metadata !23), !dbg !38
%0 = load i8, i8* @x3, align 4, !dbg !38
tail call void @llvm.dbg.value(metadata i8 %0, metadata !36, metadata !23), !dbg !38
store i8 %a, i8* @x3, align 4, !dbg !38
ret i8 %0, !dbg !39
}
; Function Attrs: nounwind optsize
define zeroext i8 @get4(i8 zeroext %a) #0 !dbg !40 {
entry:
tail call void @llvm.dbg.value(metadata i8 %a, metadata !42, metadata !23), !dbg !45
%0 = load i8, i8* @x4, align 4, !dbg !45
tail call void @llvm.dbg.value(metadata i8 %0, metadata !43, metadata !23), !dbg !45
store i8 %a, i8* @x4, align 4, !dbg !45
ret i8 %0, !dbg !46
}
; Function Attrs: nounwind optsize
define zeroext i8 @get5(i8 zeroext %a) #0 !dbg !47 {
entry:
tail call void @llvm.dbg.value(metadata i8 %a, metadata !49, metadata !23), !dbg !52
%0 = load i8, i8* @x5, align 4, !dbg !52
tail call void @llvm.dbg.value(metadata i8 %0, metadata !50, metadata !23), !dbg !52
store i8 %a, i8* @x5, align 4, !dbg !52
ret i8 %0, !dbg !53
}
attributes #0 = { nounwind optsize }
attributes #1 = { nounwind readnone }
!llvm.dbg.cu = !{!12}
!llvm.module.flags = !{!15}
!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
!1 = !DIGlobalVariable(name: "x1", scope: !2, file: !2, line: 3, type: !3, isLocal: true, isDefinition: true)
!2 = !DIFile(filename: "foo.c", directory: "/tmp/")
!3 = !DIBasicType(name: "_Bool", size: 8, align: 8, encoding: DW_ATE_boolean)
!4 = !DIGlobalVariableExpression(var: !5, expr: !DIExpression())
!5 = !DIGlobalVariable(name: "x2", scope: !2, file: !2, line: 6, type: !3, isLocal: true, isDefinition: true)
!6 = !DIGlobalVariableExpression(var: !7, expr: !DIExpression())
!7 = !DIGlobalVariable(name: "x3", scope: !2, file: !2, line: 9, type: !3, isLocal: true, isDefinition: true)
!8 = !DIGlobalVariableExpression(var: !9, expr: !DIExpression())
!9 = !DIGlobalVariable(name: "x4", scope: !2, file: !2, line: 12, type: !3, isLocal: true, isDefinition: true)
!10 = !DIGlobalVariableExpression(var: !11, expr: !DIExpression())
!11 = !DIGlobalVariable(name: "x5", scope: !2, file: !2, line: 15, type: !3, isLocal: false, isDefinition: true)
!12 = distinct !DICompileUnit(language: DW_LANG_C89, file: !2, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2369.8)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !13, retainedTypes: !13, globals: !14, imports: !13)
!13 = !{}
!14 = !{!0, !4, !6, !8, !10}
!15 = !{i32 1, !"Debug Info Version", i32 3}
!16 = distinct !DISubprogram(name: "get1", linkageName: "get1", scope: !2, file: !2, line: 4, type: !17, isLocal: false, isDefinition: true, scopeLine: 4, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !12, retainedNodes: !19)
!17 = !DISubroutineType(types: !18)
!18 = !{!3, !3}
!19 = !{!20, !21}
!20 = !DILocalVariable(name: "a", arg: 1, scope: !16, file: !2, line: 4, type: !3)
!21 = !DILocalVariable(name: "b", scope: !22, file: !2, line: 4, type: !3)
!22 = distinct !DILexicalBlock(scope: !16, file: !2, line: 4)
!23 = !DIExpression()
!24 = !DILocation(line: 4, scope: !16)
!25 = !DILocation(line: 4, scope: !22)
!26 = distinct !DISubprogram(name: "get2", linkageName: "get2", scope: !2, file: !2, line: 7, type: !17, isLocal: false, isDefinition: true, scopeLine: 7, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !12, retainedNodes: !27)
!27 = !{!28, !29}
!28 = !DILocalVariable(name: "a", arg: 1, scope: !26, file: !2, line: 7, type: !3)
!29 = !DILocalVariable(name: "b", scope: !30, file: !2, line: 7, type: !3)
!30 = distinct !DILexicalBlock(scope: !26, file: !2, line: 7)
!31 = !DILocation(line: 7, scope: !26)
!32 = !DILocation(line: 7, scope: !30)
!33 = distinct !DISubprogram(name: "get3", linkageName: "get3", scope: !2, file: !2, line: 10, type: !17, isLocal: false, isDefinition: true, scopeLine: 10, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !12, retainedNodes: !34)
!34 = !{!35, !36}
!35 = !DILocalVariable(name: "a", arg: 1, scope: !33, file: !2, line: 10, type: !3)
!36 = !DILocalVariable(name: "b", scope: !37, file: !2, line: 10, type: !3)
!37 = distinct !DILexicalBlock(scope: !33, file: !2, line: 10)
!38 = !DILocation(line: 10, scope: !33)
!39 = !DILocation(line: 10, scope: !37)
!40 = distinct !DISubprogram(name: "get4", linkageName: "get4", scope: !2, file: !2, line: 13, type: !17, isLocal: false, isDefinition: true, scopeLine: 13, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !12, retainedNodes: !41)
!41 = !{!42, !43}
!42 = !DILocalVariable(name: "a", arg: 1, scope: !40, file: !2, line: 13, type: !3)
!43 = !DILocalVariable(name: "b", scope: !44, file: !2, line: 13, type: !3)
!44 = distinct !DILexicalBlock(scope: !40, file: !2, line: 13)
!45 = !DILocation(line: 13, scope: !40)
!46 = !DILocation(line: 13, scope: !44)
!47 = distinct !DISubprogram(name: "get5", linkageName: "get5", scope: !2, file: !2, line: 16, type: !17, isLocal: false, isDefinition: true, scopeLine: 16, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !12, retainedNodes: !48)
!48 = !{!49, !50}
!49 = !DILocalVariable(name: "a", arg: 1, scope: !47, file: !2, line: 16, type: !3)
!50 = !DILocalVariable(name: "b", scope: !51, file: !2, line: 16, type: !3)
!51 = distinct !DILexicalBlock(scope: !47, file: !2, line: 16)
!52 = !DILocation(line: 16, scope: !47)
!53 = !DILocation(line: 16, scope: !51)
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