2c864551df
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
82 lines
4.0 KiB
LLVM
82 lines
4.0 KiB
LLVM
; RUN: opt -S -loop-rotate < %s | FileCheck %s
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;CHECK-LABEL: func
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;CHECK-LABEL: entry
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;CHECK-NEXT: tail call void @llvm.dbg.value(metadata i32 %a
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;CHECK-NEXT: tail call void @llvm.dbg.value(metadata i32 1, metadata ![[I_VAR:[0-9]+]], metadata !DIExpression())
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;CHECK-LABEL: for.body:
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;CHECK-NEXT: [[I:%.*]] = phi i32 [ 1, %entry ], [ %inc, %for.body ]
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;CHECK-NEXT: tail call void @llvm.dbg.value(metadata i32 [[I]], metadata ![[I_VAR]], metadata !DIExpression())
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; CHECK: ![[I_VAR]] = !DILocalVariable(name: "i",{{.*}})
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; Function Attrs: noinline nounwind
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define void @func(i32 %a) local_unnamed_addr #0 !dbg !6 {
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entry:
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tail call void @llvm.dbg.value(metadata i32 %a, metadata !10, metadata !11), !dbg !12
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tail call void @llvm.dbg.value(metadata i32 1, metadata !13, metadata !11), !dbg !15
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br label %for.cond, !dbg !16
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for.cond: ; preds = %for.body, %entry
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%i.0 = phi i32 [ 1, %entry ], [ %inc, %for.body ]
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tail call void @llvm.dbg.value(metadata i32 %i.0, metadata !13, metadata !11), !dbg !15
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%cmp = icmp slt i32 %i.0, 10, !dbg !17
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br i1 %cmp, label %for.body, label %for.end, !dbg !20
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for.body: ; preds = %for.cond
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%add = add nsw i32 %i.0, %a, !dbg !22
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%call = tail call i32 @func2(i32 %i.0, i32 %add) #3, !dbg !24
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%inc = add nsw i32 %i.0, 1, !dbg !25
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tail call void @llvm.dbg.value(metadata i32 %inc, metadata !13, metadata !11), !dbg !15
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br label %for.cond, !dbg !27, !llvm.loop !28
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for.end: ; preds = %for.cond
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ret void, !dbg !31
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}
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declare i32 @func2(i32, i32) local_unnamed_addr
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.value(metadata, metadata, metadata) #2
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attributes #0 = { noinline nounwind }
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attributes #2 = { nounwind readnone }
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attributes #3 = { nounwind }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4}
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!llvm.ident = !{!5}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 5.0.0 (http://llvm.org/git/clang.git 0f3ed908c1f13f83da4b240f7595eb8d05e0a754) (http://llvm.org/git/llvm.git 8e270f5a6b8ceb0f3ac3ef1ffb83c5e29b44ae68)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "debug-phi.c", directory: "/work/projects/src/tests/debug")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{!"clang version 5.0.0 (http://llvm.org/git/clang.git 0f3ed908c1f13f83da4b240f7595eb8d05e0a754) (http://llvm.org/git/llvm.git 8e270f5a6b8ceb0f3ac3ef1ffb83c5e29b44ae68)"}
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!6 = distinct !DISubprogram(name: "func", scope: !1, file: !1, line: 2, type: !7, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
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!7 = !DISubroutineType(types: !8)
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!8 = !{null, !9}
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!9 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!10 = !DILocalVariable(name: "a", arg: 1, scope: !6, file: !1, line: 2, type: !9)
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!11 = !DIExpression()
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!12 = !DILocation(line: 2, column: 15, scope: !6)
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!13 = !DILocalVariable(name: "i", scope: !14, file: !1, line: 3, type: !9)
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!14 = distinct !DILexicalBlock(scope: !6, file: !1, line: 3, column: 3)
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!15 = !DILocation(line: 3, column: 11, scope: !14)
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!16 = !DILocation(line: 3, column: 7, scope: !14)
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!17 = !DILocation(line: 3, column: 20, scope: !18)
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!18 = !DILexicalBlockFile(scope: !19, file: !1, discriminator: 1)
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!19 = distinct !DILexicalBlock(scope: !14, file: !1, line: 3, column: 3)
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!20 = !DILocation(line: 3, column: 3, scope: !21)
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!21 = !DILexicalBlockFile(scope: !14, file: !1, discriminator: 1)
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!22 = !DILocation(line: 4, column: 15, scope: !23)
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!23 = distinct !DILexicalBlock(scope: !19, file: !1, line: 3, column: 31)
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!24 = !DILocation(line: 4, column: 5, scope: !23)
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!25 = !DILocation(line: 3, column: 27, scope: !26)
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!26 = !DILexicalBlockFile(scope: !19, file: !1, discriminator: 2)
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!27 = !DILocation(line: 3, column: 3, scope: !26)
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!28 = distinct !{!28, !29, !30}
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!29 = !DILocation(line: 3, column: 3, scope: !14)
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!30 = !DILocation(line: 5, column: 3, scope: !14)
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!31 = !DILocation(line: 6, column: 1, scope: !6)
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