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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
76 lines
3.4 KiB
LLVM
76 lines
3.4 KiB
LLVM
; RUN: opt -analyze -scalar-evolution < %s | FileCheck %s
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; Make sure poison value tracking works in the presence of @llvm.dbg
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; intrinsics. Unfortunately, I was not able to reduce this file
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; further while still keeping the debug info well formed.
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define void @foo(i32 %n, i32* %arr) !dbg !7 {
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; CHECK-LABEL: Classifying expressions for: @foo
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entry:
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%cmp1 = icmp slt i32 0, %n, !dbg !12
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br i1 %cmp1, label %for.body.lr.ph, label %for.end, !dbg !15
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for.body.lr.ph: ; preds = %entry
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br label %for.body, !dbg !15
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for.body: ; preds = %for.inc, %for.body.lr.ph
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%i.02 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.inc ]
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%add = add nsw i32 %i.02, 50, !dbg !16
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call void @llvm.dbg.value(metadata i32 %add, i64 0, metadata !18, metadata !19), !dbg !20
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%idxprom = sext i32 %add to i64, !dbg !21
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; CHECK: %idxprom = sext i32 %add to i64
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; CHECK-NEXT: --> {50,+,1}<nuw><nsw><%for.body>
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%arrayidx = getelementptr inbounds i32, i32* %arr, i64 %idxprom, !dbg !21
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store i32 100, i32* %arrayidx, align 4, !dbg !22
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br label %for.inc, !dbg !23
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for.inc: ; preds = %for.body
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%inc = add nsw i32 %i.02, 1, !dbg !24
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%cmp = icmp slt i32 %inc, %n, !dbg !12
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br i1 %cmp, label %for.body, label %for.cond.for.end_crit_edge, !dbg !15, !llvm.loop !25
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for.cond.for.end_crit_edge: ; preds = %for.inc
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br label %for.end, !dbg !15
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for.end: ; preds = %for.cond.for.end_crit_edge, %entry
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ret void, !dbg !27
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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)
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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 version 3.9.0 (llvm/trunk 271857)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "x.c", directory: "/Users/sanjoy/Code/clang/build/debug+asserts-x86")
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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 3}
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!5 = !{i32 1, !"PIC Level", i32 2}
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!6 = !{!"clang version 3.9.0 (llvm/trunk 271857)"}
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!7 = distinct !DISubprogram(name: "foo", 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: !9)
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!9 = !{null, !10, !11}
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!10 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !10, size: 64, align: 64)
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!12 = !DILocation(line: 2, column: 24, scope: !13)
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!13 = distinct !DILexicalBlock(scope: !14, file: !1, line: 2, column: 6)
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!14 = distinct !DILexicalBlock(scope: !7, file: !1, line: 2, column: 6)
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!15 = !DILocation(line: 2, column: 6, scope: !14)
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!16 = !DILocation(line: 3, column: 14, scope: !17)
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!17 = distinct !DILexicalBlock(scope: !13, file: !1, line: 2, column: 34)
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!18 = !DILocalVariable(name: "k", scope: !17, file: !1, line: 3, type: !10)
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!19 = !DIExpression()
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!20 = !DILocation(line: 3, column: 8, scope: !17)
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!21 = !DILocation(line: 4, column: 4, scope: !17)
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!22 = !DILocation(line: 4, column: 11, scope: !17)
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!23 = !DILocation(line: 5, column: 6, scope: !17)
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!24 = !DILocation(line: 2, column: 30, scope: !13)
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!25 = distinct !{!25, !26}
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!26 = !DILocation(line: 2, column: 6, scope: !7)
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!27 = !DILocation(line: 6, column: 1, scope: !7)
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