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a8a13bc662
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
50 lines
2.2 KiB
LLVM
50 lines
2.2 KiB
LLVM
; Check that the DISubrange 'count' reference is correctly uniqued and restored,
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; since it can take the value of either a signed integer or a DIVariable.
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; RUN: llvm-as < %s | llvm-dis | FileCheck %s
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define void @foo(i32 %n) {
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entry:
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%0 = zext i32 %n to i64
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%vla = alloca i32, i64 %0, align 16
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call void @llvm.dbg.declare(metadata i32* %vla, metadata !19, metadata !12), !dbg !18
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ret void
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}
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
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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 5.0.1", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "vla.c", directory: "/path/to")
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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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!5 = !{i32 1, !"wchar_size", i32 4}
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!6 = !{!"clang version 5.0.1"}
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!7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 20, type: !8, isLocal: false, isDefinition: true, scopeLine: 20, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !11)
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!8 = !DISubroutineType(types: !9)
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!9 = !{null, !10}
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!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!11 = !{!16, !19}
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!12 = !DIExpression()
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!16 = !DILocalVariable(name: "vla_expr", scope: !7, file: !1, line: 21, type: !17)
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!17 = !DIBasicType(name: "long unsigned int", size: 64, encoding: DW_ATE_unsigned)
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!18 = !DILocation(line: 21, column: 7, scope: !7)
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!19 = !DILocalVariable(name: "vla", scope: !7, file: !1, line: 21, type: !20)
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!20 = !DICompositeType(tag: DW_TAG_array_type, baseType: !10, align: 32, elements: !21)
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!21 = !{!22, !23, !24, !25, !26, !27}
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; CHECK-DAG: ![[NODE:[0-9]+]] = !DILocalVariable(name: "vla_expr"
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; CHECK-DAG: ![[RANGE:[0-9]+]] = !DISubrange(count: ![[NODE]])
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; CHECK-DAG: ![[CONST:[0-9]+]] = !DISubrange(count: 16)
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; CHECK-DAG: ![[MULTI:[0-9]+]] = !{![[RANGE]], ![[RANGE]], ![[CONST]], ![[CONST]], ![[CONST]], ![[CONST]]}
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; CHECK-DAG: elements: ![[MULTI]]
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!22 = !DISubrange(count: !16)
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!23 = !DISubrange(count: !16)
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!24 = !DISubrange(count: 16)
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!25 = !DISubrange(count: i16 16)
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!26 = !DISubrange(count: i32 16)
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!27 = !DISubrange(count: i64 16)
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