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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
96 lines
5.3 KiB
LLVM
96 lines
5.3 KiB
LLVM
; RUN: llc -filetype=obj %s -o - | llvm-dwarfdump - | FileCheck %s
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; CHECK: file format Mach-O arm
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; ModuleID = 'test.ll'
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source_filename = "test.i"
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target datalayout = "e-m:o-p:32:32-f64:32:64-v64:32:64-v128:32:128-a:0:32-n32-S32"
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target triple = "thumbv7s-apple-ios5.0.0"
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%struct.vm_object = type { i64 }
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; Function Attrs: nounwind ssp
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define void @f(%struct.vm_object* %object, i64* nocapture readonly %start) local_unnamed_addr #0 !dbg !11 {
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entry:
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tail call void @llvm.dbg.value(metadata %struct.vm_object* %object, metadata !21, metadata !DIExpression()), !dbg !27
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tail call void @llvm.dbg.value(metadata i64* %start, metadata !22, metadata !DIExpression()), !dbg !28
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tail call void @llvm.dbg.value(metadata i64 %0, metadata !25, metadata !DIExpression()), !dbg !29
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tail call void @llvm.dbg.value(metadata i64 %0, metadata !26, metadata !DIExpression(DW_OP_constu, 4096, DW_OP_minus, DW_OP_stack_value)), !dbg !30
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; This debug value cannot safely be split into two 32-bit pieces.
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; CHECK-NOT: DW_AT_name(offset)
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tail call void @llvm.dbg.value(metadata i32 undef, metadata !23, metadata !DIExpression()), !dbg !31
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br i1 undef, label %for.end, label %for.body.lr.ph, !dbg !31
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for.body.lr.ph: ; preds = %entry
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%0 = load i64, i64* %start, align 4, !dbg !33
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br label %for.body, !dbg !31
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for.body: ; preds = %for.body, %for.body.lr.ph
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%offset.010.in = phi i64 [ %0, %for.body.lr.ph ], [ %offset.010, %for.body ]
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%head_size.09 = phi i32 [ undef, %for.body.lr.ph ], [ %sub2, %for.body ]
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%offset.010 = add i64 %offset.010.in, -4096
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tail call void @llvm.dbg.value(metadata i32 %head_size.09, metadata !23, metadata !DIExpression()), !dbg !30
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%call = tail call i32 bitcast (i32 (...)* @use to i32 (i64, %struct.vm_object*)*)(i64 %offset.010, %struct.vm_object* %object) #2, !dbg !34
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%sub2 = add i32 %head_size.09, -4096, !dbg !37
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tail call void @llvm.dbg.value(metadata i64 %offset.010, metadata !26, metadata !DIExpression(DW_OP_constu, 4096, DW_OP_minus, DW_OP_stack_value)), !dbg !29
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tail call void @llvm.dbg.value(metadata i32 %sub2, metadata !23, metadata !DIExpression()), !dbg !30
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%tobool = icmp eq i32 %sub2, 0, !dbg !31
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br i1 %tobool, label %for.end, label %for.body, !dbg !31, !llvm.loop !38
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for.end: ; preds = %for.body, %entry
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ret void, !dbg !40
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}
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declare i32 @use(...) local_unnamed_addr
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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 ssp }
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attributes #1 = { nounwind readnone speculatable }
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attributes #2 = { nobuiltin nounwind }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!5, !6, !7, !8, !9}
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!llvm.ident = !{!10}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 6.0.0 (trunk 317434) (llvm/trunk 317437)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !3)
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!1 = !DIFile(filename: "test.i", directory: "/Data/radar/31209283")
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!2 = !{}
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!3 = !{!4}
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!4 = !DIBasicType(name: "long long unsigned int", size: 64, encoding: DW_ATE_unsigned)
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!5 = !{i32 2, !"Dwarf Version", i32 2}
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!6 = !{i32 2, !"Debug Info Version", i32 3}
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!7 = !{i32 1, !"wchar_size", i32 4}
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!8 = !{i32 1, !"min_enum_size", i32 4}
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!9 = !{i32 7, !"PIC Level", i32 2}
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!10 = !{!"clang version 6.0.0 (trunk 317434) (llvm/trunk 317437)"}
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!11 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 6, type: !12, isLocal: false, isDefinition: true, scopeLine: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !20)
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!12 = !DISubroutineType(types: !13)
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!13 = !{null, !14, !19}
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!14 = !DIDerivedType(tag: DW_TAG_typedef, name: "v_t", file: !1, line: 1, baseType: !15)
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!15 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !16, size: 32)
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!16 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "v", file: !1, line: 2, size: 64, elements: !17)
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!17 = !{!18}
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!18 = !DIDerivedType(tag: DW_TAG_member, name: "p", scope: !16, file: !1, line: 3, baseType: !4, size: 64)
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!19 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !4, size: 32)
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!20 = !{!21, !22, !23, !25, !26}
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!21 = !DILocalVariable(name: "object", arg: 1, scope: !11, file: !1, line: 6, type: !14)
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!22 = !DILocalVariable(name: "start", arg: 2, scope: !11, file: !1, line: 6, type: !19)
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!23 = !DILocalVariable(name: "head_size", scope: !11, file: !1, line: 7, type: !24)
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!24 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)
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!25 = !DILocalVariable(name: "orig_start", scope: !11, file: !1, line: 8, type: !4)
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!26 = !DILocalVariable(name: "offset", scope: !11, file: !1, line: 9, type: !4)
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!27 = !DILocation(line: 6, column: 20, scope: !11)
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!28 = !DILocation(line: 6, column: 48, scope: !11)
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!29 = !DILocation(line: 7, column: 12, scope: !11)
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!30 = !DILocation(line: 10, column: 16, scope: !11)
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!31 = !DILocation(line: 11, column: 5, scope: !32)
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!32 = distinct !DILexicalBlock(scope: !11, file: !1, line: 11, column: 5)
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!33 = !DILocation(line: 8, column: 22, scope: !11)
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!34 = !DILocation(line: 13, column: 7, scope: !35)
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!35 = distinct !DILexicalBlock(scope: !36, file: !1, line: 12, column: 75)
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!36 = distinct !DILexicalBlock(scope: !32, file: !1, line: 11, column: 5)
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!37 = !DILocation(line: 12, column: 61, scope: !36)
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!38 = distinct !{!38, !31, !39}
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!39 = !DILocation(line: 14, column: 3, scope: !32)
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!40 = !DILocation(line: 15, column: 1, scope: !11)
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