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a2029fa58e
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
103 lines
5.6 KiB
LLVM
103 lines
5.6 KiB
LLVM
; RUN: llc < %s -O2 -mtriple=aarch64-none-linux-gnu
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; Bug 20598
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define void @test() #0 !dbg !4 {
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entry:
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br label %for.body, !dbg !39
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for.body: ; preds = %for.body, %entry
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%arrayidx5 = getelementptr inbounds i32, i32* null, i64 1, !dbg !43
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%0 = load i32, i32* null, align 4, !dbg !45, !tbaa !46
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%s1 = sub nsw i32 0, %0, !dbg !50
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%n1 = sext i32 %s1 to i64, !dbg !50
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%arrayidx21 = getelementptr inbounds i32, i32* null, i64 3, !dbg !51
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%add53 = add nsw i64 %n1, 0, !dbg !52
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%add55 = add nsw i64 %n1, 0, !dbg !53
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%mul63 = mul nsw i64 %add53, -20995, !dbg !54
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tail call void @llvm.dbg.value(metadata i64 %mul63, i64 0, metadata !30, metadata !DIExpression()), !dbg !55
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%mul65 = mul nsw i64 %add55, -3196, !dbg !56
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%add67 = add nsw i64 0, %mul65, !dbg !57
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%add80 = add i64 0, 1024, !dbg !58
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%add81 = add i64 %add80, %mul63, !dbg !58
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%add82 = add i64 %add81, 0, !dbg !58
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%shr83351 = lshr i64 %add82, 11, !dbg !58
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%conv84 = trunc i64 %shr83351 to i32, !dbg !58
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store i32 %conv84, i32* %arrayidx21, align 4, !dbg !58, !tbaa !46
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%add86 = add i64 0, 1024, !dbg !59
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%add87 = add i64 %add86, 0, !dbg !59
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%add88 = add i64 %add87, %add67, !dbg !59
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%shr89352 = lshr i64 %add88, 11, !dbg !59
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%n2 = trunc i64 %shr89352 to i32, !dbg !59
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store i32 %n2, i32* %arrayidx5, align 4, !dbg !59, !tbaa !46
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br label %for.body, !dbg !39
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}
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #1
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attributes #0 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { nounwind readnone }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!36, !37}
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!llvm.ident = !{!38}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.6.0 ", isOptimized: true, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "test.c", directory: "")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "", line: 140, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 141, file: !1, scope: !1, type: !6, retainedNodes: !12)
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!6 = !DISubroutineType(types: !7)
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!7 = !{null, !8}
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!8 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !9)
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!9 = !DIDerivedType(tag: DW_TAG_typedef, line: 30, file: !1, baseType: !11)
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!11 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!12 = !{!13, !14, !18, !19, !20, !21, !22, !23, !24, !25, !26, !27, !28, !29, !30, !31, !32, !33, !34, !35}
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!13 = !DILocalVariable(name: "", line: 140, arg: 1, scope: !4, file: !1, type: !8)
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!14 = !DILocalVariable(name: "", line: 142, scope: !4, file: !1, type: !15)
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!15 = !DIDerivedType(tag: DW_TAG_typedef, line: 183, file: !1, baseType: !17)
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!17 = !DIBasicType(tag: DW_TAG_base_type, size: 64, align: 64, encoding: DW_ATE_signed)
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!18 = !DILocalVariable(name: "", line: 142, scope: !4, file: !1, type: !15)
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!19 = !DILocalVariable(name: "", line: 142, scope: !4, file: !1, type: !15)
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!20 = !DILocalVariable(name: "", line: 142, scope: !4, file: !1, type: !15)
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!21 = !DILocalVariable(name: "", line: 142, scope: !4, file: !1, type: !15)
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!22 = !DILocalVariable(name: "", line: 142, scope: !4, file: !1, type: !15)
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!23 = !DILocalVariable(name: "", line: 142, scope: !4, file: !1, type: !15)
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!24 = !DILocalVariable(name: "", line: 142, scope: !4, file: !1, type: !15)
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!25 = !DILocalVariable(name: "", line: 143, scope: !4, file: !1, type: !15)
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!26 = !DILocalVariable(name: "", line: 143, scope: !4, file: !1, type: !15)
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!27 = !DILocalVariable(name: "", line: 143, scope: !4, file: !1, type: !15)
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!28 = !DILocalVariable(name: "", line: 143, scope: !4, file: !1, type: !15)
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!29 = !DILocalVariable(name: "", line: 144, scope: !4, file: !1, type: !15)
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!30 = !DILocalVariable(name: "", line: 144, scope: !4, file: !1, type: !15)
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!31 = !DILocalVariable(name: "", line: 144, scope: !4, file: !1, type: !15)
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!32 = !DILocalVariable(name: "", line: 144, scope: !4, file: !1, type: !15)
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!33 = !DILocalVariable(name: "", line: 144, scope: !4, file: !1, type: !15)
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!34 = !DILocalVariable(name: "", line: 145, scope: !4, file: !1, type: !8)
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!35 = !DILocalVariable(name: "", line: 146, scope: !4, file: !1, type: !11)
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!36 = !{i32 2, !"Dwarf Version", i32 4}
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!37 = !{i32 2, !"Debug Info Version", i32 3}
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!38 = !{!"clang version 3.6.0 "}
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!39 = !DILocation(line: 154, column: 8, scope: !40)
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!40 = distinct !DILexicalBlock(line: 154, column: 8, file: !1, scope: !41)
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!41 = distinct !DILexicalBlock(line: 154, column: 8, file: !1, scope: !42)
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!42 = distinct !DILexicalBlock(line: 154, column: 3, file: !1, scope: !4)
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!43 = !DILocation(line: 157, column: 5, scope: !44)
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!44 = distinct !DILexicalBlock(line: 154, column: 42, file: !1, scope: !42)
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!45 = !DILocation(line: 159, column: 5, scope: !44)
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!46 = !{!47, !47, i64 0}
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!47 = !{!"int", !48, i64 0}
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!48 = !{!"omnipotent char", !49, i64 0}
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!49 = !{!"Simple C/C++ TBAA"}
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!50 = !DILocation(line: 160, column: 5, scope: !44)
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!51 = !DILocation(line: 161, column: 5, scope: !44)
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!52 = !DILocation(line: 188, column: 5, scope: !44)
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!53 = !DILocation(line: 190, column: 5, scope: !44)
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!54 = !DILocation(line: 198, column: 5, scope: !44)
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!55 = !DILocation(line: 144, column: 13, scope: !4)
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!56 = !DILocation(line: 200, column: 5, scope: !44)
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!57 = !DILocation(line: 203, column: 5, scope: !44)
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!58 = !DILocation(line: 207, column: 5, scope: !44)
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!59 = !DILocation(line: 208, column: 5, scope: !44)
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