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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. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@331841 91177308-0d34-0410-b5e6-96231b3b80d8
64 lines
3.6 KiB
LLVM
64 lines
3.6 KiB
LLVM
; RUN: llc < %s -march=hexagon -mcpu=hexagonv4 -O2 -disable-lsr | FileCheck %s
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; ModuleID = 'hwloop-dbg.o'
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target datalayout = "e-p:32:32:32-i64:64:64-i32:32:32-i16:16:16-i1:32:32-f64:64:64-f32:32:32-v64:64:64-v32:32:32-a0:0-n16:32"
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target triple = "hexagon"
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define void @foo(i32* nocapture %a, i32* nocapture %b) nounwind !dbg !5 {
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entry:
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tail call void @llvm.dbg.value(metadata i32* %a, i64 0, metadata !13, metadata !DIExpression()), !dbg !17
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tail call void @llvm.dbg.value(metadata i32* %b, i64 0, metadata !14, metadata !DIExpression()), !dbg !18
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tail call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !15, metadata !DIExpression()), !dbg !19
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br label %for.body, !dbg !19
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for.body: ; preds = %for.body, %entry
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; CHECK: loop0(
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; CHECK-NOT: add({{r[0-9]*}}, #
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; CHECK: endloop0
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%arrayidx.phi = phi i32* [ %a, %entry ], [ %arrayidx.inc, %for.body ]
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%i.02 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
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%b.addr.01 = phi i32* [ %b, %entry ], [ %incdec.ptr, %for.body ]
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%incdec.ptr = getelementptr inbounds i32, i32* %b.addr.01, i32 1, !dbg !21
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tail call void @llvm.dbg.value(metadata i32* %incdec.ptr, i64 0, metadata !14, metadata !DIExpression()), !dbg !21
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%0 = load i32, i32* %b.addr.01, align 4, !dbg !21
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store i32 %0, i32* %arrayidx.phi, align 4, !dbg !21
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%inc = add nsw i32 %i.02, 1, !dbg !26
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tail call void @llvm.dbg.value(metadata i32 %inc, i64 0, metadata !15, metadata !DIExpression()), !dbg !26
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%exitcond = icmp eq i32 %inc, 10, !dbg !19
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%arrayidx.inc = getelementptr i32, i32* %arrayidx.phi, i32 1
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br i1 %exitcond, label %for.end, label %for.body, !dbg !19
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for.end: ; preds = %for.body
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ret void, !dbg !27
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}
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnone
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!29}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "QuIC LLVM Hexagon Clang version 6.1-pre-unknown, (git://git-hexagon-aus.quicinc.com/llvm/clang-mainline.git e9382867661454cdf44addb39430741578e9765c) (llvm/llvm-mainline.git 36412bb1fcf03ed426d4437b41198bae066675ac)", isOptimized: true, emissionKind: FullDebug, file: !28, enums: !2, retainedTypes: !2, globals: !2)
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!2 = !{}
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!5 = distinct !DISubprogram(name: "foo", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 1, file: !28, scope: null, type: !7, retainedNodes: !11)
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!6 = !DIFile(filename: "hwloop-dbg.c", directory: "/usr2/kparzysz/s.hex/t")
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!7 = !DISubroutineType(types: !8)
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!8 = !{null, !9, !9}
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!9 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 32, align: 32, baseType: !10)
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!10 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!11 = !{!13, !14, !15}
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!13 = !DILocalVariable(name: "a", line: 1, arg: 1, scope: !5, file: !6, type: !9)
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!14 = !DILocalVariable(name: "b", line: 1, arg: 2, scope: !5, file: !6, type: !9)
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!15 = !DILocalVariable(name: "i", line: 2, scope: !16, file: !6, type: !10)
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!16 = distinct !DILexicalBlock(line: 1, column: 26, file: !28, scope: !5)
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!17 = !DILocation(line: 1, column: 15, scope: !5)
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!18 = !DILocation(line: 1, column: 23, scope: !5)
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!19 = !DILocation(line: 3, column: 8, scope: !20)
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!20 = distinct !DILexicalBlock(line: 3, column: 3, file: !28, scope: !16)
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!21 = !DILocation(line: 4, column: 5, scope: !22)
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!22 = distinct !DILexicalBlock(line: 3, column: 28, file: !28, scope: !20)
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!26 = !DILocation(line: 3, column: 23, scope: !20)
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!27 = !DILocation(line: 6, column: 1, scope: !16)
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!28 = !DIFile(filename: "hwloop-dbg.c", directory: "/usr2/kparzysz/s.hex/t")
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!29 = !{i32 1, !"Debug Info Version", i32 3}
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!30 = !{i32 0}
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