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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
85 lines
3.9 KiB
LLVM
85 lines
3.9 KiB
LLVM
; RUN: llc -mtriple=x86_64-pc-linux -split-dwarf-file=input.dwo -O3 \
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; RUN: -function-sections -data-sections \
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; RUN: -relocation-model=pic -filetype=asm \
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; RUN: -generate-type-units -o - %s | \
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; RUN: FileCheck %s --check-prefix=CHECK-ASM
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; RUN: llc -mtriple=x86_64-pc-linux -split-dwarf-file=input.dwo -O3 \
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; RUN: -function-sections -data-sections \
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; RUN: -relocation-model=pic -filetype=obj \
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; RUN: -generate-type-units -o - %s | \
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; RUN: llvm-readelf -sections | \
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; RUN: FileCheck %s --check-prefix=CHECK-ELF
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; Created from `clang++ -fxray-instrument -gsplit-dwarf -fdebug-types-section
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; -ffunction-sections -fdata-sections -emit-llvm -S input.cc`:
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; input.cc:
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;
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; class a {
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; int b();
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; };
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; int a::b() {
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; for (;;)
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; ;
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; }
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;
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; In this test we want to make sure that the xray_instr_map section for
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; `a::b()` is actually associated with the function's symbol instead of the
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; .debug_types.dwo section.
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;
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; CHECK-ASM: xray_fn_idx,"awo",@progbits,_ZN1a1bEv,unique,1
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;
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; CHECK-ELF-DAG: [[FSECT:[0-9]+]]] .text._ZN1a1bEv PROGBITS
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; CHECK-ELF-DAG: [{{.*}}] .debug_types.dwo PROGBITS
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; CHECK-ELF-DAG: [{{.*}}] xray_instr_map PROGBITS {{.*}} {{.*}} {{.*}} {{.*}} WAL [[FSECT]]
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target triple = "x86_64-pc-linux"
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%class.a = type { i8 }
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; Function Attrs: nounwind readnone uwtable
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define i32 @_ZN1a1bEv(%class.a* nocapture readnone) local_unnamed_addr #0 align 2 !dbg !8 {
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tail call void @llvm.dbg.value(metadata %class.a* %0, metadata !17, metadata !DIExpression()), !dbg !19
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br label %2, !dbg !20
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; <label>:2: ; preds = %2, %1
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br label %2, !dbg !21, !llvm.loop !25
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}
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; Function Attrs: nounwind readnone speculatable
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declare void @llvm.dbg.value(metadata, metadata, metadata) #1
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attributes #0 = { nounwind readnone uwtable "xray-instruction-threshold"="200" }
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attributes #1 = { nounwind readnone speculatable }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5, !6}
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!llvm.ident = !{!7}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version trunk (trunk r312634)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, debugInfoForProfiling: true)
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!1 = !DIFile(filename: "input.cc", directory: "/usr/local/google/home/dberris/tmp")
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!2 = !{}
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!3 = !{i32 2, !"Debug Info Version", i32 3}
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!4 = !{i32 1, !"wchar_size", i32 4}
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!5 = !{i32 7, !"PIC Level", i32 2}
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!6 = !{i32 7, !"PIE Level", i32 2}
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!7 = !{!"clang version trunk (trunk r312634)"}
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!8 = distinct !DISubprogram(name: "b", linkageName: "_ZN1a1bEv", scope: !9, file: !1, line: 4, type: !12, isLocal: false, isDefinition: true, scopeLine: 4, flags: DIFlagPrototyped, isOptimized: true, unit: !0, declaration: !11, retainedNodes: !16)
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!9 = distinct !DICompositeType(tag: DW_TAG_class_type, name: "a", file: !1, line: 1, size: 8, elements: !10, identifier: "_ZTS1a")
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!10 = !{!11}
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!11 = !DISubprogram(name: "b", linkageName: "_ZN1a1bEv", scope: !9, file: !1, line: 2, type: !12, isLocal: false, isDefinition: false, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: true)
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!12 = !DISubroutineType(types: !13)
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!13 = !{!14, !15}
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!14 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!15 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !9, size: 64, flags: DIFlagArtificial | DIFlagObjectPointer)
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!16 = !{!17}
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!17 = !DILocalVariable(name: "this", arg: 1, scope: !8, type: !18, flags: DIFlagArtificial | DIFlagObjectPointer)
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!18 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !9, size: 64)
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!19 = !DILocation(line: 0, scope: !8)
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!20 = !DILocation(line: 5, column: 3, scope: !8)
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!21 = !DILocation(line: 5, column: 3, scope: !22)
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!22 = !DILexicalBlockFile(scope: !23, file: !1, discriminator: 2)
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!23 = distinct !DILexicalBlock(scope: !24, file: !1, line: 5, column: 3)
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!24 = distinct !DILexicalBlock(scope: !8, file: !1, line: 5, column: 3)
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!25 = distinct !{!25, !26, !27}
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!26 = !DILocation(line: 5, column: 3, scope: !24)
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!27 = !DILocation(line: 6, column: 5, scope: !24)
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