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a8a13bc662
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. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@331841 91177308-0d34-0410-b5e6-96231b3b80d8
75 lines
3.4 KiB
LLVM
75 lines
3.4 KiB
LLVM
; RUN: %llc_dwarf -filetype=obj %s -o - | llvm-dwarfdump -v -debug-info - | FileCheck %s
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; A hand-written testcase to check 64-bit constant handling in location lists.
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; CHECK: .debug_info contents:
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; CHECK: DW_TAG_variable
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; CHECK-NEXT: DW_AT_location [DW_FORM_data4] (
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; CHECK-NEXT: [0x{{.*}}, 0x{{.*}}): DW_OP_constu 0x4000000000000000)
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; CHECK-NEXT: DW_AT_name {{.*}}"d"
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; CHECK: DW_TAG_variable
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; CHECK-NEXT: DW_AT_location [DW_FORM_data4] (
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; CHECK-NEXT: [0x{{.*}}, 0x{{.*}}): DW_OP_consts +0
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; CHECK-NEXT: [0x{{.*}}, 0x{{.*}}): DW_OP_consts +4611686018427387904)
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; CHECK-NEXT: DW_AT_name {{.*}}"i"
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; CHECK: DW_TAG_variable
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; CHECK-NEXT: DW_AT_location [DW_FORM_data4] (
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; CHECK-NEXT: [0x{{.*}}, 0x{{.*}}): DW_OP_constu 0x0
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; CHECK-NEXT: [0x{{.*}}, 0x{{.*}}): DW_OP_constu 0x4000000000000000)
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; CHECK-NEXT: DW_AT_name {{.*}}"u"
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source_filename = "test.c"
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx"
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; Function Attrs: nounwind ssp uwtable
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define void @main() #0 !dbg !7 {
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%1 = alloca double, align 8
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%2 = alloca i64, align 8
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%3 = alloca i64, align 8
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store double 2.000000e+00, double* %1, align 8, !dbg !21
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call void @llvm.dbg.value(metadata i64 0, metadata !22, metadata !15), !dbg !24
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call void @llvm.dbg.value(metadata i64 0, metadata !25, metadata !15), !dbg !27
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call void @llvm.dbg.value(metadata double 2.000000e+00, metadata !19, metadata !15), !dbg !21
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store i64 4611686018427387904, i64* %2, align 8, !dbg !24
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call void @llvm.dbg.value(metadata i64 4611686018427387904, metadata !22, metadata !15), !dbg !24
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call void @llvm.dbg.value(metadata i64 4611686018427387904, metadata !25, metadata !15), !dbg !27
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store i64 4611686018427387904, i64* %3, align 8, !dbg !27
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ret void, !dbg !28
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}
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
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declare void @llvm.dbg.value(metadata, metadata, metadata) #1
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attributes #0 = { nounwind ssp uwtable }
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attributes #1 = { nounwind readnone }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5}
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!llvm.ident = !{!6}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "test.c", directory: "/tmp")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 2}
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!4 = !{i32 2, !"Debug Info Version", i32 00000003}
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!5 = !{i32 1, !"PIC Level", i32 2}
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!6 = !{!"clang"}
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!7 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 1, type: !8, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
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!8 = !DISubroutineType(types: !{})
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!15 = !DIExpression()
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!16 = !DILocation(line: 1, column: 14, scope: !7)
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!18 = !DILocation(line: 1, column: 24, scope: !7)
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!19 = !DILocalVariable(name: "d", scope: !7, file: !1, line: 2, type: !20)
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!20 = !DIBasicType(name: "double", size: 64, align: 64, encoding: DW_ATE_float)
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!21 = !DILocation(line: 2, column: 10, scope: !7)
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!22 = !DILocalVariable(name: "u", scope: !7, file: !1, line: 3, type: !23)
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!23 = !DIBasicType(name: "long long unsigned int", size: 64, align: 64, encoding: DW_ATE_unsigned)
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!24 = !DILocation(line: 3, column: 22, scope: !7)
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!25 = !DILocalVariable(name: "i", scope: !7, file: !1, line: 4, type: !26)
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!26 = !DIBasicType(name: "long long int", size: 64, align: 64, encoding: DW_ATE_signed)
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!27 = !DILocation(line: 4, column: 20, scope: !7)
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!28 = !DILocation(line: 5, column: 3, scope: !7)
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