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: opt < %s -debug-only=loop-vectorize -loop-vectorize -mtriple=x86_64-unknown-linux -S 2>&1 | FileCheck %s
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; REQUIRES: asserts
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; Test that the register usage estimation is not affected by the presence of
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; debug intrinsics.
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;
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; In the test below the values %0 and %r.08 are ended in the add instruction
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; preceding the call to the intrinsic, and will be recorded against the index
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; of the call instruction. This means the debug intrinsic must be considered
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; when erasing instructions from the list of open-intervals.
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;
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; Tests generated from following source (with and without -g):
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; unsigned test(unsigned *a, unsigned n) {
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; unsigned i, r = 0;
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; for(i = 0; i < n; i++)
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; r += a[i];
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; return r;
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; }
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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: LV: Checking a loop in "test_g"
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; CHECK: LV(REG): Found max usage: 2
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define i32 @test_g(i32* nocapture readonly %a, i32 %n) local_unnamed_addr !dbg !6 {
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entry:
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tail call void @llvm.dbg.value(metadata i32* %a, i64 0, metadata !12, metadata !16), !dbg !17
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tail call void @llvm.dbg.value(metadata i32 %n, i64 0, metadata !13, metadata !16), !dbg !18
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tail call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !15, metadata !16), !dbg !19
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tail call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !14, metadata !16), !dbg !20
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tail call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !15, metadata !16), !dbg !19
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tail call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !14, metadata !16), !dbg !20
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%cmp6 = icmp eq i32 %n, 0, !dbg !21
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br i1 %cmp6, label %for.end, label %for.body.preheader, !dbg !25
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for.body.preheader: ; preds = %entry
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%wide.trip.count = zext i32 %n to i64, !dbg !21
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br label %for.body, !dbg !27
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for.body: ; preds = %for.body.preheader, %for.body
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%indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %for.body.preheader ]
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%r.08 = phi i32 [ %add, %for.body ], [ 0, %for.body.preheader ]
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%arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv, !dbg !27
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%0 = load i32, i32* %arrayidx, align 4, !dbg !27, !tbaa !28
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%add = add i32 %0, %r.08, !dbg !32
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tail call void @llvm.dbg.value(metadata i32 %add, i64 0, metadata !15, metadata !16), !dbg !19
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1, !dbg !33
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tail call void @llvm.dbg.value(metadata i32 %add, i64 0, metadata !15, metadata !16), !dbg !19
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%exitcond = icmp eq i64 %indvars.iv.next, %wide.trip.count, !dbg !21
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br i1 %exitcond, label %for.end.loopexit, label %for.body, !dbg !25, !llvm.loop !35
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for.end.loopexit: ; preds = %for.body
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br label %for.end, !dbg !38
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for.end: ; preds = %for.end.loopexit, %entry
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%r.0.lcssa = phi i32 [ 0, %entry ], [ %add, %for.end.loopexit ]
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ret i32 %r.0.lcssa, !dbg !38
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}
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; CHECK: LV: Checking a loop in "test"
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; CHECK: LV(REG): Found max usage: 2
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define i32 @test(i32* nocapture readonly %a, i32 %n) local_unnamed_addr {
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entry:
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%cmp6 = icmp eq i32 %n, 0
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br i1 %cmp6, label %for.end, label %for.body.preheader
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for.body.preheader: ; preds = %entry
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%wide.trip.count = zext i32 %n to i64
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br label %for.body
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for.body: ; preds = %for.body.preheader, %for.body
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%indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %for.body.preheader ]
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%r.08 = phi i32 [ %add, %for.body ], [ 0, %for.body.preheader ]
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%arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
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%0 = load i32, i32* %arrayidx, align 4, !tbaa !28
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%add = add i32 %0, %r.08
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%exitcond = icmp eq i64 %indvars.iv.next, %wide.trip.count
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br i1 %exitcond, label %for.end.loopexit, label %for.body
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for.end.loopexit: ; preds = %for.body
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br label %for.end
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for.end: ; preds = %for.end.loopexit, %entry
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%r.0.lcssa = phi i32 [ 0, %entry ], [ %add, %for.end.loopexit ]
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ret i32 %r.0.lcssa
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}
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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}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "test.c", directory: "")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!6 = distinct !DISubprogram(name: "test_g", scope: !1, file: !1, line: 1, type: !7, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !11)
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!7 = !DISubroutineType(types: !8)
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!8 = !{!9, !10, !9}
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!9 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)
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!10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !9, size: 64)
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!11 = !{!12, !13, !14, !15}
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!12 = !DILocalVariable(name: "a", arg: 1, scope: !6, file: !1, line: 1, type: !10)
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!13 = !DILocalVariable(name: "n", arg: 2, scope: !6, file: !1, line: 1, type: !9)
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!14 = !DILocalVariable(name: "i", scope: !6, file: !1, line: 2, type: !9)
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!15 = !DILocalVariable(name: "r", scope: !6, file: !1, line: 2, type: !9)
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!16 = !DIExpression()
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!17 = !DILocation(line: 1, column: 27, scope: !6)
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!18 = !DILocation(line: 1, column: 39, scope: !6)
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!19 = !DILocation(line: 2, column: 15, scope: !6)
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!20 = !DILocation(line: 2, column: 12, scope: !6)
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!21 = !DILocation(line: 3, column: 16, scope: !22)
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!22 = !DILexicalBlockFile(scope: !23, file: !1, discriminator: 1)
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!23 = distinct !DILexicalBlock(scope: !24, file: !1, line: 3, column: 3)
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!24 = distinct !DILexicalBlock(scope: !6, file: !1, line: 3, column: 3)
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!25 = !DILocation(line: 3, column: 3, scope: !26)
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!26 = !DILexicalBlockFile(scope: !24, file: !1, discriminator: 1)
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!27 = !DILocation(line: 4, column: 10, scope: !23)
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!28 = !{!29, !29, i64 0}
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!29 = !{!"int", !30, i64 0}
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!30 = !{!"omnipotent char", !31, i64 0}
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!31 = !{!"Simple C/C++ TBAA"}
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!32 = !DILocation(line: 4, column: 7, scope: !23)
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!33 = !DILocation(line: 3, column: 22, scope: !34)
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!34 = !DILexicalBlockFile(scope: !23, file: !1, discriminator: 2)
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!35 = distinct !{!35, !36, !37}
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!36 = !DILocation(line: 3, column: 3, scope: !24)
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!37 = !DILocation(line: 4, column: 13, scope: !24)
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!38 = !DILocation(line: 5, column: 3, scope: !6)
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