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
73 lines
3.1 KiB
LLVM
73 lines
3.1 KiB
LLVM
; Test that coverage instrumentation does not lose debug location.
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; RUN: opt < %s -sancov -sanitizer-coverage-level=2 -S | FileCheck %s
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; C++ source:
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; 1: void foo(int *a) {
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; 2: if (a)
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; 3: *a = 0;
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; 4: }
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; clang++ if.cc -O3 -g -S -emit-llvm
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; and add sanitize_address to @_Z3fooPi
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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; Check that __sanitizer_cov call has !dgb pointing to the beginning
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; of appropriate basic blocks.
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; CHECK-LABEL:_Z3fooPi
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; CHECK: call void @__sanitizer_cov{{.*}}(i32*{{.*}}), !dbg [[A:!.*]]
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; CHECK: call void @__sanitizer_cov{{.*}}(i32*{{.*}}), !dbg [[B:!.*]]
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; CHECK: ret void
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; CHECK: [[A]] = !DILocation(line: 1, scope: !{{.*}})
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; CHECK: [[B]] = !DILocation(line: 3, column: 5, scope: !{{.*}})
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define void @_Z3fooPi(i32* %a) #0 !dbg !4 {
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entry:
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tail call void @llvm.dbg.value(metadata i32* %a, i64 0, metadata !11, metadata !DIExpression()), !dbg !15
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%tobool = icmp eq i32* %a, null, !dbg !16
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br i1 %tobool, label %if.end, label %if.then, !dbg !16
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if.then: ; preds = %entry
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store i32 0, i32* %a, align 4, !dbg !18, !tbaa !19
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br label %if.end, !dbg !18
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if.end: ; preds = %entry, %if.then
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ret void, !dbg !23
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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) #1
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attributes #0 = { nounwind uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" sanitize_address}
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attributes #1 = { nounwind readnone }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!12, !13}
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!llvm.ident = !{!14}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.6.0 (217079)", isOptimized: true, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "if.cc", directory: "FOO")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "foo", linkageName: "_Z3fooPi", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 1, file: !1, scope: !5, type: !6, retainedNodes: !10)
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!5 = !DIFile(filename: "if.cc", directory: "FOO")
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!6 = !DISubroutineType(types: !7)
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!7 = !{null, !8}
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!8 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !9)
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!9 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!10 = !{!11}
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!11 = !DILocalVariable(name: "a", line: 1, arg: 1, scope: !4, file: !5, type: !8)
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!12 = !{i32 2, !"Dwarf Version", i32 4}
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!13 = !{i32 2, !"Debug Info Version", i32 3}
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!14 = !{!"clang version 3.6.0 (217079)"}
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!15 = !DILocation(line: 1, column: 15, scope: !4)
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!16 = !DILocation(line: 2, column: 7, scope: !17)
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!17 = distinct !DILexicalBlock(line: 2, column: 7, file: !1, scope: !4)
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!18 = !DILocation(line: 3, column: 5, scope: !17)
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!19 = !{!20, !20, i64 0}
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!20 = !{!"int", !21, i64 0}
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!21 = !{!"omnipotent char", !22, i64 0}
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!22 = !{!"Simple C/C++ TBAA"}
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!23 = !DILocation(line: 4, column: 1, scope: !4)
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