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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
107 lines
4.9 KiB
LLVM
107 lines
4.9 KiB
LLVM
; RUN: opt -loop-unroll -unroll-runtime -unroll-allow-remainder -unroll-count=4 -unroll-remainder -S %s -o - | FileCheck %s
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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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@b = common local_unnamed_addr global i32 0, align 4, !dbg !0
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@a = common local_unnamed_addr global i32* null, align 8, !dbg !6
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; Test that loop remainder unrolling doesn't corrupt debuginfo. This example
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; used to cause an assert, but also test that the unrolled backwards branches
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; have the same DILocation.
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; CHECK-LABEL: func_c
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; CHECK-LABEL: for.body.lr.ph:
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; CHECK: br i1 %[[CMP0:.*]], label %[[PRE:.*]], label %for.body.prol.loopexit, !dbg !24
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; CHECK-LABEL: for.body:
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; CHECK: br i1 %[[CMP1:.*]], label %[[CRIT_EDGE:.*]], label %for.body, !dbg !24, !llvm.loop !30
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; CHECK-LABEL: for.cond.for.end_crit_edge:
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; CHECK: br label %for.end, !dbg !24
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; CHECK-LABEL: for.body.prol.1:
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; CHECK: br i1 %[[CMP2:.*]], label %for.body.prol.2, label %[[EXIT:.*]], !dbg !24
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; CHECK-LABEL: for.body.prol.2:
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define i32 @func_c() local_unnamed_addr #0 !dbg !14 {
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entry:
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%.pr = load i32, i32* @b, align 4, !dbg !17, !tbaa !20
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%tobool1 = icmp eq i32 %.pr, 0, !dbg !24
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br i1 %tobool1, label %for.end, label %for.body.lr.ph, !dbg !24
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for.body.lr.ph:
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%a.promoted = load i32*, i32** @a, align 8, !dbg !25, !tbaa !26
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%0 = sub i32 -2, %.pr, !dbg !24
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%1 = and i32 %0, -2, !dbg !24
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%2 = add i32 %.pr, %1, !dbg !24
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br label %for.body, !dbg !24
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for.body:
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%3 = phi i32* [ %a.promoted, %for.body.lr.ph ], [ %6, %for.body ], !dbg !28
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%4 = phi i32 [ %.pr, %for.body.lr.ph ], [ %add, %for.body ]
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%arrayidx = getelementptr inbounds i32, i32* %3, i64 1, !dbg !28
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%5 = load i32, i32* %arrayidx, align 4, !dbg !28, !tbaa !20
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%conv = sext i32 %5 to i64, !dbg !28
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%6 = inttoptr i64 %conv to i32*, !dbg !28
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%add = add nsw i32 %4, 2, !dbg !29
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%tobool = icmp eq i32 %add, 0, !dbg !24
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br i1 %tobool, label %for.cond.for.end_crit_edge, label %for.body, !dbg !24, !llvm.loop !30
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for.cond.for.end_crit_edge:
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%7 = add i32 %2, 2, !dbg !24
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store i32* %6, i32** @a, align 8, !dbg !25, !tbaa !26
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store i32 %7, i32* @b, align 4, !dbg !32, !tbaa !20
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br label %for.end, !dbg !24
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for.end:
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ret i32 undef, !dbg !33
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}
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; CHECK-LABEL: func_d
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define void @func_d() local_unnamed_addr #1 !dbg !34 {
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entry:
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ret void, !dbg !37
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}
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attributes #0 = { norecurse nounwind uwtable }
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attributes #0 = { norecurse nounwind readnone uwtable }
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!10, !11, !12}
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!llvm.ident = !{!13}
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!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
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!1 = distinct !DIGlobalVariable(name: "b", scope: !2, file: !3, line: 2, type: !9, isLocal: false, isDefinition: true)
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!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 6.0.0 (http://llvm.org/git/clang.git 044091b728654e62444a7ea10e6efb489c705bed) (http://llvm.org/git/llvm.git 1c7b55afdb1c5791e0557d9e32e2dd07c7acb2b0)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5)
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!3 = !DIFile(filename: "loop.c", directory: "/work/projects/src/tests/unroll-debug-info")
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!4 = !{}
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!5 = !{!6, !0}
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!6 = !DIGlobalVariableExpression(var: !7, expr: !DIExpression())
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!7 = distinct !DIGlobalVariable(name: "a", scope: !2, file: !3, line: 1, type: !8, isLocal: false, isDefinition: true)
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!8 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !9, size: 64)
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!9 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!10 = !{i32 2, !"Dwarf Version", i32 4}
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!11 = !{i32 2, !"Debug Info Version", i32 3}
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!12 = !{i32 1, !"wchar_size", i32 4}
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!13 = !{!"clang version 6.0.0 (http://llvm.org/git/clang.git 044091b728654e62444a7ea10e6efb489c705bed) (http://llvm.org/git/llvm.git 1c7b55afdb1c5791e0557d9e32e2dd07c7acb2b0)"}
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!14 = distinct !DISubprogram(name: "c", scope: !3, file: !3, line: 3, type: !15, isLocal: false, isDefinition: true, scopeLine: 3, isOptimized: true, unit: !2, retainedNodes: !4)
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!15 = !DISubroutineType(types: !16)
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!16 = !{!9}
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!17 = !DILocation(line: 4, column: 12, scope: !18)
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!18 = distinct !DILexicalBlock(scope: !19, file: !3, line: 4, column: 5)
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!19 = distinct !DILexicalBlock(scope: !14, file: !3, line: 4, column: 5)
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!20 = !{!21, !21, i64 0}
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!21 = !{!"int", !22, i64 0}
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!22 = !{!"omnipotent char", !23, i64 0}
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!23 = !{!"Simple C/C++ TBAA"}
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!24 = !DILocation(line: 4, column: 5, scope: !19)
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!25 = !DILocation(line: 5, column: 13, scope: !18)
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!26 = !{!27, !27, i64 0}
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!27 = !{!"any pointer", !22, i64 0}
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!28 = !DILocation(line: 5, column: 15, scope: !18)
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!29 = !DILocation(line: 4, column: 21, scope: !18)
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!30 = distinct !{!30, !24, !31}
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!31 = !DILocation(line: 5, column: 18, scope: !19)
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!32 = !DILocation(line: 4, column: 17, scope: !18)
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!33 = !DILocation(line: 6, column: 1, scope: !14)
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!34 = distinct !DISubprogram(name: "d", scope: !3, file: !3, line: 7, type: !35, isLocal: false, isDefinition: true, scopeLine: 7, isOptimized: true, unit: !2, retainedNodes: !4)
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!35 = !DISubroutineType(types: !36)
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!36 = !{null}
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!37 = !DILocation(line: 7, column: 11, scope: !34)
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