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
114 lines
7.1 KiB
LLVM
114 lines
7.1 KiB
LLVM
; RUN: llc -mtriple=x86_64-apple-darwin < %s -o -
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; RUN: llc -mtriple=x86_64-pc-linux-gnu < %s -o - | FileCheck --check-prefix=IGNORE_INTRIN %s
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; PR16954
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;
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; Make sure that when we splice off the end of a machine basic block, we include
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; DBG_VALUE MI in the terminator sequence.
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@a = external global { i64, [56 x i8] }, align 32
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; Function Attrs: nounwind sspreq
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define i32 @_Z18read_response_sizev() #0 !dbg !9 {
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entry:
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tail call void @llvm.dbg.value(metadata !22, i64 0, metadata !23, metadata !DIExpression()), !dbg !39
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%0 = load i64, i64* getelementptr inbounds ({ i64, [56 x i8] }, { i64, [56 x i8] }* @a, i32 0, i32 0), align 8, !dbg !40
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tail call void @llvm.dbg.value(metadata i32 undef, i64 0, metadata !64, metadata !DIExpression()), !dbg !71
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%1 = trunc i64 %0 to i32
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ret i32 %1
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}
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define i32 @IgnoreIntrinsicTest() #1 {
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; IGNORE_INTRIN: IgnoreIntrinsicTest:
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%1 = alloca i32, align 4
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%2 = bitcast i32* %1 to i8*
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call void @llvm.dbg.declare(metadata i32* %1, metadata !73, metadata !DIExpression()), !dbg !74
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store volatile i32 1, i32* %1, align 4
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%3 = load volatile i32, i32* %1, align 4
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%4 = mul nsw i32 %3, 42
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ret i32 %4
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; IGNORE_INTRIN-NOT: callq __stack_chk_fail
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; IGNORE_INTRIN: .cfi_endproc
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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)
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declare void @llvm.dbg.declare(metadata, metadata, metadata)
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attributes #0 = { sspreq }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!21, !72}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.4 ", isOptimized: true, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !5, globals: !20, imports: !5)
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!1 = !DIFile(filename: "<unknown>", directory: "/Users/matt/ryan_bug")
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!2 = !{!3}
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!3 = !DICompositeType(tag: DW_TAG_enumeration_type, line: 20, size: 32, align: 32, file: !1, scope: !4, elements: !6)
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!4 = !DICompositeType(tag: DW_TAG_structure_type, name: "C", line: 19, size: 8, align: 8, file: !1, elements: !5)
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!5 = !{}
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!6 = !{!7}
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!7 = !DIEnumerator(name: "max_frame_size", value: 0) ; [ DW_TAG_enumerator ] [max_frame_size :: 0]
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!9 = distinct !DISubprogram(name: "read_response_size", linkageName: "_Z18read_response_sizev", line: 27, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 27, file: !1, scope: !10, type: !11, retainedNodes: !14)
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!10 = !DIFile(filename: "<unknown>", directory: "/Users/matt/ryan_bug")
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!11 = !DISubroutineType(types: !12)
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!12 = !{!13}
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!13 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!14 = !{!15, !19}
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!15 = !DILocalVariable(name: "b", line: 28, scope: !9, file: !10, type: !16)
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!16 = !DICompositeType(tag: DW_TAG_structure_type, name: "B", line: 16, size: 32, align: 32, file: !1, elements: !17)
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!17 = !{!18}
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!18 = !DIDerivedType(tag: DW_TAG_member, name: "end_of_file", line: 17, size: 32, align: 32, file: !1, scope: !16, baseType: !13)
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!19 = !DILocalVariable(name: "c", line: 29, scope: !9, file: !10, type: !13)
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!20 = !{}
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!21 = !{i32 2, !"Dwarf Version", i32 2}
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!22 = !{i64* getelementptr inbounds ({ i64, [56 x i8] }, { i64, [56 x i8] }* @a, i32 0, i32 0)}
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!23 = !DILocalVariable(name: "p2", line: 12, arg: 2, scope: !24, file: !10, type: !32)
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!24 = distinct !DISubprogram(name: "min<unsigned long long>", linkageName: "_ZN3__13minIyEERKT_S3_RS1_", line: 12, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 12, file: !1, scope: !25, type: !27, templateParams: !33, retainedNodes: !35)
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!25 = !DINamespace(name: "__1", scope: null)
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!26 = !DIFile(filename: "main.cpp", directory: "/Users/matt/ryan_bug")
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!27 = !DISubroutineType(types: !28)
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!28 = !{!29, !29, !32}
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!29 = !DIDerivedType(tag: DW_TAG_reference_type, baseType: !30)
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!30 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !31)
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!31 = !DIBasicType(tag: DW_TAG_base_type, name: "long long unsigned int", size: 64, align: 64, encoding: DW_ATE_unsigned)
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!32 = !DIDerivedType(tag: DW_TAG_reference_type, baseType: !31)
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!33 = !{!34}
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!34 = !DITemplateTypeParameter(name: "_Tp", type: !31)
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!35 = !{!36, !37}
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!36 = !DILocalVariable(name: "p1", line: 12, arg: 1, scope: !24, file: !10, type: !29)
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!37 = !DILocalVariable(name: "p2", line: 12, arg: 2, scope: !24, file: !10, type: !32)
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!38 = !DILocation(line: 33, scope: !9)
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!39 = !DILocation(line: 12, scope: !24, inlinedAt: !38)
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!40 = !DILocation(line: 9, scope: !41, inlinedAt: !59)
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!41 = distinct !DISubprogram(name: "min<unsigned long long, __1::A>", linkageName: "_ZN3__13minIyNS_1AEEERKT_S4_RS2_T0_", line: 7, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 8, file: !1, scope: !25, type: !42, templateParams: !53, retainedNodes: !55)
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!42 = !DISubroutineType(types: !43)
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!43 = !{!29, !29, !32, !44}
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!44 = !DICompositeType(tag: DW_TAG_structure_type, name: "A", size: 8, align: 8, file: !1, scope: !25, elements: !45)
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!45 = !{!46}
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!46 = !DISubprogram(name: "operator()", linkageName: "_ZN3__11AclERKiS2_", line: 1, isLocal: false, isDefinition: false, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 1, file: !1, scope: !44, type: !47)
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!47 = !DISubroutineType(types: !48)
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!48 = !{!13, !49, !50, !50}
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!49 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, flags: DIFlagArtificial | DIFlagObjectPointer, baseType: !44)
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!50 = !DIDerivedType(tag: DW_TAG_reference_type, baseType: !51)
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!51 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !13)
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!53 = !{!34, !54}
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!54 = !DITemplateTypeParameter(name: "_Compare", type: !44)
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!55 = !{!56, !57, !58}
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!56 = !DILocalVariable(name: "p1", line: 7, arg: 1, scope: !41, file: !10, type: !29)
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!57 = !DILocalVariable(name: "p2", line: 7, arg: 2, scope: !41, file: !10, type: !32)
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!58 = !DILocalVariable(name: "p3", line: 8, arg: 3, scope: !41, file: !10, type: !44)
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!59 = !DILocation(line: 13, scope: !24, inlinedAt: !38)
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!63 = !{i32 undef}
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!64 = !DILocalVariable(name: "p1", line: 1, arg: 2, scope: !65, file: !10, type: !50)
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!65 = distinct !DISubprogram(name: "operator()", linkageName: "_ZN3__11AclERKiS2_", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 2, file: !1, scope: !25, type: !47, declaration: !46, retainedNodes: !66)
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!66 = !{!67, !69, !70}
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!67 = !DILocalVariable(name: "this", arg: 1, flags: DIFlagArtificial | DIFlagObjectPointer, scope: !65, type: !68)
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!68 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !44)
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!69 = !DILocalVariable(name: "p1", line: 1, arg: 2, scope: !65, file: !10, type: !50)
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!70 = !DILocalVariable(name: "", line: 2, arg: 3, scope: !65, file: !10, type: !50)
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!71 = !DILocation(line: 1, scope: !65, inlinedAt: !40)
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!72 = !{i32 1, !"Debug Info Version", i32 3}
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!73 = !DILocalVariable(name: "x", scope: !74, file: !1, line: 2, type: !13)
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!74 = distinct !DISubprogram(name: "IgnoreIntrinsicTest", linkageName: "IgnoreIntrinsicTest", scope: !1, file: !1, line: 1, type: !13, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !5)
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!75 = !DILocation(line: 2, column: 16, scope: !7)
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