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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
52 lines
2.4 KiB
LLVM
52 lines
2.4 KiB
LLVM
; REQUIRES: object-emission
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; RUN: %llc_dwarf < %s -filetype=obj | llvm-dwarfdump -debug-dump=info - | FileCheck %s
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; Given the following source, ensure that the discriminator is emitted for
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; the inlined callsite.
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;void xyz();
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;static void __attribute__((always_inline)) bar() { xyz(); }
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;void foo() {
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; bar(); bar();
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;}
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;CHECK: DW_TAG_inlined_subroutine
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;CHECK-NOT: DW_AT_GNU_discriminator
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;CHECK: DW_TAG_inlined_subroutine
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;CHECK-NOT: {{DW_TAG|NULL}}
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;CHECK: DW_AT_GNU_discriminator{{.*}}0x01
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; Function Attrs: uwtable
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define void @_Z3foov() #0 !dbg !4 {
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tail call void @_Z3xyzv(), !dbg !11
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tail call void @_Z3xyzv(), !dbg !13
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ret void, !dbg !16
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}
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declare void @_Z3xyzv() #1
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attributes #0 = { uwtable "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!8, !9}
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!llvm.ident = !{!10}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 3.8.0 (trunk 252497)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "a.cc", directory: "/tmp")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "foo", linkageName: "_Z3foov", scope: !1, file: !1, line: 3, type: !5, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !2)
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!5 = !DISubroutineType(types: !6)
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!6 = !{null}
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!7 = distinct !DISubprogram(name: "bar", linkageName: "_ZL3barv", scope: !1, file: !1, line: 2, type: !5, isLocal: true, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !2)
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!8 = !{i32 2, !"Dwarf Version", i32 4}
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!9 = !{i32 2, !"Debug Info Version", i32 3}
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!10 = !{!"clang version 3.8.0 (trunk 252497)"}
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!11 = !DILocation(line: 2, column: 52, scope: !7, inlinedAt: !12)
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!12 = distinct !DILocation(line: 4, column: 3, scope: !4)
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!13 = !DILocation(line: 2, column: 52, scope: !7, inlinedAt: !14)
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!14 = distinct !DILocation(line: 4, column: 10, scope: !15)
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!15 = !DILexicalBlockFile(scope: !4, file: !1, discriminator: 1)
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!16 = !DILocation(line: 5, column: 1, scope: !4)
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