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
135 lines
6.3 KiB
LLVM
135 lines
6.3 KiB
LLVM
; RUN: llc -O0 %s -o - -filetype=obj \
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; RUN: | llvm-dwarfdump -statistics - | FileCheck %s
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; int GlobalConst = 42;
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; int Global;
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;
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; struct S {
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; static const int constant = 24;
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; } s;
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;
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; int __attribute__((always_inline)) square(int i) { return i * i; }
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; int cube(int i) {
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; int squared = square(i);
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; return squared*i;
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; }
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; GlobalConst,Global,s,s.constant,square::i,cube::i,cube::squared
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; CHECK: "unique source variables":7
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; +1 extra inline i.
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; CHECK: "source variables":8
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; -1 square::i
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; CHECK: "variables with location":7
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; CHECK: "scope bytes total":[[BYTES:[0-9]+]]
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; Because of the dbg.value in the middle of the function, the pc range coverage
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; must be below 100%.
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; CHECK-NOT: "scope bytes covered":0
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; CHECK-NOT "scope bytes covered":[[BYTES]]
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; CHECK: "scope bytes covered":
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; ModuleID = '/tmp/quality.cpp'
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source_filename = "/tmp/quality.cpp"
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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-macosx10.12.0"
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%struct.S = type { i8 }
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@GlobalConst = global i32 42, align 4, !dbg !0
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@Global = global i32 0, align 4, !dbg !6
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@s = global %struct.S zeroinitializer, align 1, !dbg !9
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; Function Attrs: alwaysinline nounwind ssp uwtable
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define i32 @_Z6squarei(i32 %i) #0 !dbg !20 {
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entry:
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%i.addr = alloca i32, align 4
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store i32 %i, i32* %i.addr, align 4
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; Modified to loose debug info for i here.
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call void @llvm.dbg.declare(metadata i32* undef, metadata !23, metadata !24), !dbg !25
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%0 = load i32, i32* %i.addr, align 4, !dbg !26
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%1 = load i32, i32* %i.addr, align 4, !dbg !27
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%mul = mul nsw i32 %0, %1, !dbg !28
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ret i32 %mul, !dbg !29
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}
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; Function Attrs: nounwind readnone speculatable
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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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; Function Attrs: noinline nounwind optnone ssp uwtable
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define i32 @_Z4cubei(i32 %i) #2 !dbg !30 {
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entry:
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%i.addr.i = alloca i32, align 4
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call void @llvm.dbg.declare(metadata i32* %i.addr.i, metadata !23, metadata !24), !dbg !31
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%i.addr = alloca i32, align 4
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%squared = alloca i32, align 4
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store i32 %i, i32* %i.addr, align 4
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call void @llvm.dbg.declare(metadata i32* %i.addr, metadata !33, metadata !24), !dbg !34
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%0 = load i32, i32* %i.addr, align 4, !dbg !37
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store i32 %0, i32* %i.addr.i, align 4
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%1 = load i32, i32* %i.addr.i, align 4, !dbg !38
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%2 = load i32, i32* %i.addr.i, align 4, !dbg !39
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%mul.i = mul nsw i32 %1, %2, !dbg !40
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; Modified to cover only about 50% of the lexical scope.
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call void @llvm.dbg.value(metadata i32 %mul.i, metadata !35, metadata !24), !dbg !36
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store i32 %mul.i, i32* %squared, align 4, !dbg !36
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%3 = load i32, i32* %squared, align 4, !dbg !41
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call void @llvm.dbg.value(metadata i32 %3, metadata !35, metadata !24), !dbg !36
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%4 = load i32, i32* %i.addr, align 4, !dbg !42
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%mul = mul nsw i32 %3, %4, !dbg !43
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ret i32 %mul, !dbg !44
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}
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attributes #0 = { alwaysinline nounwind ssp uwtable }
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attributes #1 = { nounwind readnone speculatable }
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attributes #2 = { noinline nounwind optnone ssp uwtable }
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!15, !16, !17, !18}
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!llvm.ident = !{!19}
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!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
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!1 = distinct !DIGlobalVariable(name: "GlobalConst", scope: !2, file: !3, line: 1, type: !8, isLocal: false, isDefinition: true)
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!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "clang version 6.0.0 (trunk 310529) (llvm/trunk 310534)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5)
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!3 = !DIFile(filename: "/tmp/quality.cpp", directory: "/Volumes/Data/llvm")
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!4 = !{}
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!5 = !{!0, !6, !9}
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!6 = !DIGlobalVariableExpression(var: !7, expr: !DIExpression())
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!7 = distinct !DIGlobalVariable(name: "Global", scope: !2, file: !3, line: 2, type: !8, isLocal: false, isDefinition: true)
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!8 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!9 = !DIGlobalVariableExpression(var: !10, expr: !DIExpression())
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!10 = distinct !DIGlobalVariable(name: "s", scope: !2, file: !3, line: 6, type: !11, isLocal: false, isDefinition: true)
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!11 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "S", file: !3, line: 4, size: 8, elements: !12, identifier: "_ZTS1S")
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!12 = !{!13}
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!13 = !DIDerivedType(tag: DW_TAG_member, name: "constant", scope: !11, file: !3, line: 5, baseType: !14, flags: DIFlagStaticMember, extraData: i32 24)
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!14 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !8)
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!15 = !{i32 2, !"Dwarf Version", i32 4}
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!16 = !{i32 2, !"Debug Info Version", i32 3}
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!17 = !{i32 1, !"wchar_size", i32 4}
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!18 = !{i32 7, !"PIC Level", i32 2}
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!19 = !{!"clang version 6.0.0 (trunk 310529) (llvm/trunk 310534)"}
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!20 = distinct !DISubprogram(name: "square", linkageName: "_Z6squarei", scope: !3, file: !3, line: 8, type: !21, isLocal: false, isDefinition: true, scopeLine: 8, flags: DIFlagPrototyped, isOptimized: false, unit: !2, retainedNodes: !4)
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!21 = !DISubroutineType(types: !22)
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!22 = !{!8, !8}
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!23 = !DILocalVariable(name: "i", arg: 1, scope: !20, file: !3, line: 8, type: !8)
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!24 = !DIExpression()
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!25 = !DILocation(line: 8, column: 47, scope: !20)
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!26 = !DILocation(line: 8, column: 59, scope: !20)
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!27 = !DILocation(line: 8, column: 63, scope: !20)
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!28 = !DILocation(line: 8, column: 61, scope: !20)
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!29 = !DILocation(line: 8, column: 52, scope: !20)
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!30 = distinct !DISubprogram(name: "cube", linkageName: "_Z4cubei", scope: !3, file: !3, line: 9, type: !21, isLocal: false, isDefinition: true, scopeLine: 9, flags: DIFlagPrototyped, isOptimized: false, unit: !2, retainedNodes: !4)
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!31 = !DILocation(line: 8, column: 47, scope: !20, inlinedAt: !32)
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!32 = distinct !DILocation(line: 10, column: 17, scope: !30)
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!33 = !DILocalVariable(name: "i", arg: 1, scope: !30, file: !3, line: 9, type: !8)
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!34 = !DILocation(line: 9, column: 14, scope: !30)
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!35 = !DILocalVariable(name: "squared", scope: !30, file: !3, line: 10, type: !8)
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!36 = !DILocation(line: 10, column: 7, scope: !30)
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!37 = !DILocation(line: 10, column: 24, scope: !30)
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!38 = !DILocation(line: 8, column: 59, scope: !20, inlinedAt: !32)
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!39 = !DILocation(line: 8, column: 63, scope: !20, inlinedAt: !32)
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!40 = !DILocation(line: 8, column: 61, scope: !20, inlinedAt: !32)
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!41 = !DILocation(line: 11, column: 10, scope: !30)
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!42 = !DILocation(line: 11, column: 18, scope: !30)
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!43 = !DILocation(line: 11, column: 17, scope: !30)
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!44 = !DILocation(line: 11, column: 3, scope: !30)
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