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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> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@266446 91177308-0d34-0410-b5e6-96231b3b80d8
57 lines
2.7 KiB
LLVM
57 lines
2.7 KiB
LLVM
; RUN: %llc_dwarf %s -o - -dwarf-version 2 -filetype=obj | llvm-dwarfdump - | FileCheck %s --check-prefix=DWARF2
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; RUN: %llc_dwarf %s -o - -dwarf-version 3 -filetype=obj | llvm-dwarfdump - | FileCheck %s --check-prefix=DWARF3
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; RUN: %llc_dwarf %s -o - -dwarf-version 4 -filetype=obj | llvm-dwarfdump - | FileCheck %s --check-prefix=DWARF4
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; RUN: %llc_dwarf %s -o - -dwarf-version 5 -filetype=obj | llvm-dwarfdump - | FileCheck %s --check-prefix=DWARF4
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; .debug_frame is not emitted for targeting Windows x64.
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; REQUIRES: debug_frame
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; REQUIRES: default_triple
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; Function Attrs: nounwind
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define i32 @foo() #0 !dbg !4 {
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entry:
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%call = call i32 bitcast (i32 (...)* @bar to i32 ()*)(), !dbg !12
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%add = add nsw i32 %call, 1, !dbg !12
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ret i32 %add, !dbg !12
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}
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declare i32 @bar(...) #1
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attributes #0 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "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 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "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 = !{!9, !10}
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!llvm.ident = !{!11}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5.0 ", isOptimized: false, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "test.c", directory: "/tmp")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "foo", line: 2, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 2, file: !1, scope: !5, type: !6, variables: !2)
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!5 = !DIFile(filename: "test.c", directory: "/tmp")
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!6 = !DISubroutineType(types: !7)
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!7 = !{!8}
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!8 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!9 = !{i32 2, !"Dwarf Version", i32 4}
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!10 = !{i32 1, !"Debug Info Version", i32 3}
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!11 = !{!"clang version 3.5.0 "}
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!12 = !DILocation(line: 2, scope: !4)
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; DWARF2: .debug_frame contents:
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; DWARF2: Version: 1
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; DWARF2-NEXT: Augmentation:
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; DWARF2-NOT: Address size:
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; DWARF2-NOT: Segment desc size:
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; DWARF3: .debug_frame contents:
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; DWARF3: Version: 3
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; DWARF3-NEXT: Augmentation:
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; DWARF3-NOT: Address size:
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; DWARF3-NOT: Segment desc size:
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; DWARF4: .debug_frame contents:
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; DWARF4: Version: 4
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; DWARF4-NEXT: Augmentation:
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; DWARF4: Address size:
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; DWARF4: Segment desc size:
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