13a79bbfe5
On ELF every section can have a corresponding section symbol. When in an assembly file we have .quad .text the '.text' refers to that symbol. The way we used to handle them is to leave .text an undefined symbol until the very end when the object writer would map them to the actual section symbol. The problem with that is that anything before the end would see an undefined symbol. This could result in bad diagnostics (test/MC/AArch64/label-arithmetic-diags-elf.s), or incorrect results when using the asm streamer (est/MC/Mips/expansion-jal-sym-pic.s). Fixing this will also allow using the section symbol earlier for setting sh_link of SHF_METADATA sections. This patch includes a few hacks to avoid changing our behaviour when handling conflicts between section symbols and other symbols. I reported pr31850 to track that. llvm-svn: 293936
65 lines
3.0 KiB
LLVM
65 lines
3.0 KiB
LLVM
; RUN: llc -mtriple mips-linux-gnu -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: .section .debug_info,"",@progbits
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; CHECK: DW_TAG_structure_type
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; CHECK-NEXT: info_string
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source_filename = "test/DebugInfo/Mips/InlinedFnLocalVar.ll"
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@i = common global i32 0, !dbg !0
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #0
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #0
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; Function Attrs: nounwind ssp
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define i32 @bar() #1 !dbg !8 {
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entry:
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%0 = load i32, i32* @i, align 4, !dbg !11
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tail call void @llvm.dbg.value(metadata i32 %0, i64 0, metadata !13, metadata !24), !dbg !25
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tail call void @llvm.dbg.declare(metadata !5, metadata !18, metadata !24), !dbg !26
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%1 = mul nsw i32 %0, %0, !dbg !27
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store i32 %1, i32* @i, align 4, !dbg !11
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ret i32 %1, !dbg !28
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}
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attributes #0 = { nounwind readnone }
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attributes #1 = { nounwind ssp }
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!llvm.dbg.cu = !{!4}
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!llvm.module.flags = !{!7}
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!0 = !DIGlobalVariableExpression(var: !1)
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!1 = !DIGlobalVariable(name: "i", scope: !2, file: !2, line: 5, type: !3, isLocal: false, isDefinition: true)
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!2 = !DIFile(filename: "bar.c", directory: "/tmp/")
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!3 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!4 = distinct !DICompileUnit(language: DW_LANG_C89, file: !2, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !5, retainedTypes: !5, globals: !6, imports: !5)
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!5 = !{}
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!6 = !{!0}
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!7 = !{i32 1, !"Debug Info Version", i32 3}
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!8 = distinct !DISubprogram(name: "bar", linkageName: "bar", scope: !2, file: !2, line: 14, type: !9, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: true, unit: !4)
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!9 = !DISubroutineType(types: !10)
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!10 = !{!3}
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!11 = !DILocation(line: 15, scope: !12)
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!12 = distinct !DILexicalBlock(scope: !8, file: !2, line: 14)
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!13 = !DILocalVariable(name: "j", arg: 1, scope: !14, file: !2, line: 9, type: !3)
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!14 = distinct !DISubprogram(name: "foo", scope: !2, file: !2, line: 9, type: !15, isLocal: true, isDefinition: true, scopeLine: 9, virtualIndex: 6, isOptimized: true, unit: !4, variables: !17)
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!15 = !DISubroutineType(types: !16)
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!16 = !{!3, !3}
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!17 = !{!13, !18}
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!18 = !DILocalVariable(name: "xyz", scope: !19, file: !2, line: 10, type: !20)
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!19 = distinct !DILexicalBlock(scope: !14, file: !2, line: 9)
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!20 = !DICompositeType(tag: DW_TAG_structure_type, name: "X", scope: !14, file: !2, line: 10, size: 64, align: 32, elements: !21)
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!21 = !{!22, !23}
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!22 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !20, file: !2, line: 10, baseType: !3, size: 32, align: 32)
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!23 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !20, file: !2, line: 10, baseType: !3, size: 32, align: 32, offset: 32)
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!24 = !DIExpression()
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!25 = !DILocation(line: 9, scope: !14, inlinedAt: !11)
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!26 = !DILocation(line: 9, scope: !19, inlinedAt: !11)
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!27 = !DILocation(line: 11, scope: !19, inlinedAt: !11)
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!28 = !DILocation(line: 16, scope: !12)
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