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fb3abba237
Currently each Function points to a DISubprogram and DISubprogram has a scope field. For member functions the scope is a DICompositeType. DIScopes point to the DICompileUnit to facilitate type uniquing. Distinct DISubprograms (with isDefinition: true) are not part of the type hierarchy and cannot be uniqued. This change removes the subprograms list from DICompileUnit and instead adds a pointer to the owning compile unit to distinct DISubprograms. This would make it easy for ThinLTO to strip unneeded DISubprograms and their transitively referenced debug info. Motivation ---------- Materializing DISubprograms is currently the most expensive operation when doing a ThinLTO build of clang. We want the DISubprogram to be stored in a separate Bitcode block (or the same block as the function body) so we can avoid having to expensively deserialize all DISubprograms together with the global metadata. If a function has been inlined into another subprogram we need to store a reference the block containing the inlined subprogram. Attached to https://llvm.org/bugs/show_bug.cgi?id=27284 is a python script that updates LLVM IR testcases to the new format. http://reviews.llvm.org/D19034 <rdar://problem/25256815> llvm-svn: 266446
37 lines
1.4 KiB
LLVM
37 lines
1.4 KiB
LLVM
; RUN: llc -mtriple=armv7-none-linux-gnueabihf < %s -o - | FileCheck %s
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; Function Attrs: nounwind
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define void @need_cfi_def_cfa_offset() #0 !dbg !3 {
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; CHECK-LABEL: need_cfi_def_cfa_offset:
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; CHECK: sub sp, sp, #4
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; CHECK: .cfi_def_cfa_offset 4
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entry:
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%Depth = alloca i32, align 4
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call void @llvm.dbg.declare(metadata i32* %Depth, metadata !9, metadata !10), !dbg !11
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store i32 2, i32* %Depth, align 4, !dbg !11
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ret void, !dbg !12
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}
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
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attributes #0 = { nounwind }
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attributes #1 = { nounwind readnone }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!7, !8}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "", isOptimized: false, emissionKind: FullDebug)
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!1 = !DIFile(filename: "file.c", directory: "/dir")
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!2 = !{}
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!3 = distinct !DISubprogram(name: "need_cfi_def_cfa_offset", scope: !1, file: !1, line: 1, type: !4, isLocal: false, isDefinition: true, scopeLine: 2, isOptimized: false, unit: !0, variables: !2)
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!4 = !DISubroutineType(types: !5)
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!5 = !{null}
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!6 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!7 = !{i32 2, !"Dwarf Version", i32 4}
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!8 = !{i32 2, !"Debug Info Version", i32 3}
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!9 = !DILocalVariable(name: "Depth", scope: !3, file: !1, line: 3, type: !6)
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!10 = !DIExpression()
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!11 = !DILocation(line: 3, column: 9, scope: !3)
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!12 = !DILocation(line: 7, column: 5, scope: !3)
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