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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
60 lines
2.9 KiB
LLVM
60 lines
2.9 KiB
LLVM
; RUN: llvm-as %s -o %t.bc
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; RUN: llvm-as %p/Inputs/pr26037.ll -o %t2.bc
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; RUN: llvm-link -S -only-needed %t2.bc %t.bc | FileCheck %s
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; CHECK: !DIImportedEntity({{.*}}, scope: ![[B:[0-9]+]], entity: ![[A:[0-9]+]]
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; CHECK: ![[B]] = distinct !DISubprogram(name: "b"
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; CHECK: ![[A]] = distinct !DISubprogram(name: "a"
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; CHECK: !DIImportedEntity({{.*}}, scope: ![[LBC:[0-9]+]], entity: ![[LBD:[0-9]+]]
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; CHECK: ![[LBC]] = distinct !DILexicalBlock(scope: ![[C:[0-9]+]]
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; CHECK: ![[C]] = distinct !DISubprogram(name: "c"
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; CHECK: ![[LBD]] = distinct !DILexicalBlock(scope: ![[D:[0-9]+]]
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; CHECK: ![[D]] = distinct !DISubprogram(name: "d"
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define void @_ZN1A1aEv() #0 !dbg !4 {
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entry:
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ret void, !dbg !14
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}
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define void @_ZN1A1bEv() #0 !dbg !8 {
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entry:
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ret void, !dbg !15
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}
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define void @_ZN1A1cEv() #0 !dbg !18 {
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entry:
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ret void, !dbg !21
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}
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define void @_ZN1A1dEv() #0 !dbg !20 {
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entry:
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ret void, !dbg !22
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}
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!11, !12}
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!llvm.ident = !{!13}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 3.8.0 (trunk 256934) (llvm/trunk 256936)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, imports: !9)
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!1 = !DIFile(filename: "a2.cc", directory: "")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "a", linkageName: "_ZN1A1aEv", scope: !5, file: !1, line: 7, type: !6, isLocal: false, isDefinition: true, scopeLine: 7, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
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!5 = !DINamespace(name: "A", scope: null, file: !1, line: 1)
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!6 = !DISubroutineType(types: !7)
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!7 = !{null}
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!8 = distinct !DISubprogram(name: "b", linkageName: "_ZN1A1bEv", scope: !5, file: !1, line: 8, type: !6, isLocal: false, isDefinition: true, scopeLine: 8, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
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!9 = !{!10, !16}
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!10 = !DIImportedEntity(tag: DW_TAG_imported_declaration, scope: !8, entity: !4, line: 8)
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!11 = !{i32 2, !"Dwarf Version", i32 4}
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!12 = !{i32 2, !"Debug Info Version", i32 3}
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!13 = !{!"clang version 3.8.0 (trunk 256934) (llvm/trunk 256936)"}
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!14 = !DILocation(line: 7, column: 12, scope: !4)
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!15 = !DILocation(line: 8, column: 24, scope: !8)
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!16 = !DIImportedEntity(tag: DW_TAG_imported_declaration, scope: !17, entity: !19, line: 8)
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!17 = distinct !DILexicalBlock(scope: !18, file: !1, line: 9, column: 8)
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!18 = distinct !DISubprogram(name: "c", linkageName: "_ZN1A1cEv", scope: !5, file: !1, line: 9, type: !6, isLocal: false, isDefinition: true, scopeLine: 8, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
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!19 = distinct !DILexicalBlock(scope: !20, file: !1, line: 10, column: 8)
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!20 = distinct !DISubprogram(name: "d", linkageName: "_ZN1A1dEv", scope: !5, file: !1, line: 10, type: !6, isLocal: false, isDefinition: true, scopeLine: 8, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
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!21 = !DILocation(line: 9, column: 8, scope: !18)
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!22 = !DILocation(line: 10, column: 8, scope: !20)
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