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2345112c5b
This patch implements PR31013 by introducing a
DIGlobalVariableExpression that holds a pair of DIGlobalVariable and
DIExpression.
Currently, DIGlobalVariables holds a DIExpression. This is not the
best way to model this:
(1) The DIGlobalVariable should describe the source level variable,
not how to get to its location.
(2) It makes it unsafe/hard to update the expressions when we call
replaceExpression on the DIGLobalVariable.
(3) It makes it impossible to represent a global variable that is in
more than one location (e.g., a variable with multiple
DW_OP_LLVM_fragment-s). We also moved away from attaching the
DIExpression to DILocalVariable for the same reasons.
This reapplies r289902 with additional testcase upgrades.
<rdar://problem/29250149>
https://llvm.org/bugs/show_bug.cgi?id=31013
Differential Revision: https://reviews.llvm.org/D26769
llvm-svn: 289920
61 lines
3.2 KiB
LLVM
61 lines
3.2 KiB
LLVM
; RUN: llc -mtriple i686-pc-cygwin -O2 %s -o - | FileCheck %s
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; Check struct X for dead variable xyz from inlined function foo.
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; CHECK: Lsection_info
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; CHECK: DW_TAG_structure_type
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; CHECK-NEXT: info_string
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@i = common global i32 0, !dbg !16 ; <i32*> [#uses=2]
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declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnone
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define i32 @bar() nounwind ssp !dbg !6 {
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entry:
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%0 = load i32, i32* @i, align 4, !dbg !17 ; <i32> [#uses=2]
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tail call void @llvm.dbg.value(metadata i32 %0, i64 0, metadata !109, metadata !DIExpression()), !dbg !19
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tail call void @llvm.dbg.declare(metadata !29, metadata !110, metadata !DIExpression()), !dbg !21
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%1 = mul nsw i32 %0, %0, !dbg !22 ; <i32> [#uses=2]
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store i32 %1, i32* @i, align 4, !dbg !17
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ret i32 %1, !dbg !23
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}
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!28}
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!0 = distinct !DISubprogram(name: "foo", line: 9, isLocal: true, isDefinition: true, virtualIndex: 6, isOptimized: true, unit: !2, scopeLine: 9, file: !27, scope: !1, type: !3, variables: !24)
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!1 = !DIFile(filename: "bar.c", directory: "/tmp/")
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!2 = distinct !DICompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", isOptimized: true, emissionKind: FullDebug, file: !27, enums: !20, retainedTypes: !20, globals: !26, imports: !20)
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!3 = !DISubroutineType(types: !4)
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!4 = !{!5, !5}
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!5 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!6 = distinct !DISubprogram(name: "bar", linkageName: "bar", line: 14, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: true, unit: !2, file: !27, scope: !1, type: !7)
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!7 = !DISubroutineType(types: !8)
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!8 = !{!5}
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!9 = !DILocalVariable(name: "j", line: 9, arg: 1, scope: !0, file: !1, type: !5)
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!10 = !DILocalVariable(name: "xyz", line: 10, scope: !11, file: !1, type: !12)
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!109 = !DILocalVariable(name: "j", line: 9, arg: 1, scope: !0, file: !1, type: !5)
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!110 = !DILocalVariable(name: "xyz", line: 10, scope: !11, file: !1, type: !12)
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!11 = distinct !DILexicalBlock(line: 9, column: 0, file: !1, scope: !0)
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!12 = !DICompositeType(tag: DW_TAG_structure_type, name: "X", line: 10, size: 64, align: 32, file: !27, scope: !0, elements: !13)
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!13 = !{!14, !15}
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!14 = !DIDerivedType(tag: DW_TAG_member, name: "a", line: 10, size: 32, align: 32, file: !27, scope: !12, baseType: !5)
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!15 = !DIDerivedType(tag: DW_TAG_member, name: "b", line: 10, size: 32, align: 32, offset: 32, file: !27, scope: !12, baseType: !5)
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!16 = !DIGlobalVariableExpression(var: !DIGlobalVariable(name: "i", line: 5, isLocal: false, isDefinition: true, scope: !1, file: !1, type: !5))
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!17 = !DILocation(line: 15, scope: !18)
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!18 = distinct !DILexicalBlock(line: 14, column: 0, file: !1, scope: !6)
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!19 = !DILocation(line: 9, scope: !0, inlinedAt: !17)
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!20 = !{}
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!21 = !DILocation(line: 9, scope: !11, inlinedAt: !17)
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!22 = !DILocation(line: 11, scope: !11, inlinedAt: !17)
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!23 = !DILocation(line: 16, scope: !18)
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!24 = !{!9, !10}
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!26 = !{!16}
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!27 = !DIFile(filename: "bar.c", directory: "/tmp/")
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!28 = !{i32 1, !"Debug Info Version", i32 3}
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!29 = !{null}
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