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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
49 lines
1.9 KiB
LLVM
49 lines
1.9 KiB
LLVM
; RUN: llc %s -o %t -filetype=obj
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; RUN: llvm-dwarfdump -debug-dump=info %t | FileCheck %s
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; CHECK: DW_TAG_compile_unit
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; CHECK: DW_TAG_subprogram
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; CHECK: DW_AT_name{{.*}}"f"
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; CHECK-NOT: DW_TAG_compile_unit
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;
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; created from
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; void f() {} // compile with -g
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; void g() {} // compile with -Rpass=inline
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; and llvm-linking the result.
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.11.0"
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; Function Attrs: nounwind ssp uwtable
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define void @f() #0 !dbg !4 {
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entry:
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ret void, !dbg !15
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}
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; Function Attrs: nounwind ssp uwtable
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define void @g() #0 !dbg !9 {
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entry:
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ret void, !dbg !16
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}
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attributes #0 = { nounwind ssp uwtable }
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!llvm.dbg.cu = !{!0, !7}
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!llvm.ident = !{!11, !11}
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!llvm.module.flags = !{!12, !13, !14}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.9.0 (trunk 265328) (llvm/trunk 265330)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "test.c", directory: "/Volumes/Data/llvm")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 1, type: !5, isLocal: false, isDefinition: true, scopeLine: 1, isOptimized: false, unit: !0, variables: !2)
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!5 = !DISubroutineType(types: !6)
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!6 = !{null}
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!7 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.9.0 (trunk 265328) (llvm/trunk 265330)", isOptimized: false, runtimeVersion: 0, emissionKind: NoDebug, enums: !2)
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!9 = distinct !DISubprogram(name: "g", scope: !1, file: !1, line: 1, type: !10, isLocal: false, isDefinition: true, scopeLine: 1, isOptimized: false, unit: !7, variables: !2)
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!10 = !DISubroutineType(types: !2)
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!11 = !{!"clang version 3.9.0 (trunk 265328) (llvm/trunk 265330)"}
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!12 = !{i32 2, !"Dwarf Version", i32 2}
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!13 = !{i32 2, !"Debug Info Version", i32 3}
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!14 = !{i32 1, !"PIC Level", i32 2}
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!15 = !DILocation(line: 1, column: 12, scope: !4)
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!16 = !DILocation(line: 1, column: 12, scope: !9)
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