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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
81 lines
3.0 KiB
LLVM
81 lines
3.0 KiB
LLVM
; RUN: llc -filetype=asm -asm-verbose=0 -O0 < %s | FileCheck %s
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; RUN: llc -filetype=obj -O0 < %s | llvm-dwarfdump -debug-dump=line - | FileCheck %s --check-prefix=INT
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; Check that the assembly output properly handles is_stmt changes. And since
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; we're testing anyway, check the integrated assembler too.
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; Generated with clang from multiline.c:
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; void f1();
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; void f2() {
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; f1(); f1(); f1();
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; f1(); f1(); f1();
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; }
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; CHECK: .loc 1 2 0{{$}}
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; CHECK-NOT: .loc{{ }}
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; CHECK: .loc 1 3 3 prologue_end{{$}}
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; CHECK-NOT: .loc
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; CHECK: .loc 1 3 9 is_stmt 0{{$}}
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; CHECK-NOT: .loc
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; CHECK: .loc 1 3 15{{$}}
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; CHECK-NOT: .loc
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; CHECK: .loc 1 4 3 is_stmt 1{{$}}
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; CHECK-NOT: .loc
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; CHECK: .loc 1 4 9 is_stmt 0{{$}}
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; CHECK-NOT: .loc
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; CHECK: .loc 1 4 15{{$}}
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; CHECK-NOT: .loc
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; CHECK: .loc 1 5 1 is_stmt 1{{$}}
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; INT: {{^}}Address
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; INT: -----
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; INT-NEXT: 2 0 1 0 0 is_stmt{{$}}
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; INT-NEXT: 3 3 1 0 0 is_stmt prologue_end{{$}}
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; INT-NEXT: 3 9 1 0 0 {{$}}
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; INT-NEXT: 3 15 1 0 0 {{$}}
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; INT-NEXT: 4 3 1 0 0 is_stmt{{$}}
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; INT-NEXT: 4 9 1 0 0 {{$}}
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; INT-NEXT: 4 15 1 0 0 {{$}}
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; INT-NEXT: 5 1 1 0 0 is_stmt{{$}}
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; Function Attrs: nounwind uwtable
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define void @f2() #0 !dbg !4 {
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entry:
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call void (...) @f1(), !dbg !11
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call void (...) @f1(), !dbg !12
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call void (...) @f1(), !dbg !13
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call void (...) @f1(), !dbg !14
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call void (...) @f1(), !dbg !15
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call void (...) @f1(), !dbg !16
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ret void, !dbg !17
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}
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declare void @f1(...) #1
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attributes #0 = { nounwind uwtable "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 = !{!8, !9}
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!llvm.ident = !{!10}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.6.0 (trunk 225000) (llvm/trunk 224999)", isOptimized: false, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "multiline.c", directory: "/tmp/dbginfo")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "f2", line: 2, isLocal: false, isDefinition: true, isOptimized: false, unit: !0, scopeLine: 2, file: !1, scope: !5, type: !6, variables: !2)
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!5 = !DIFile(filename: "multiline.c", directory: "/tmp/dbginfo")
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!6 = !DISubroutineType(types: !7)
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!7 = !{null}
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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 3.6.0 (trunk 225000) (llvm/trunk 224999)"}
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!11 = !DILocation(line: 3, column: 3, scope: !4)
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!12 = !DILocation(line: 3, column: 9, scope: !4)
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!13 = !DILocation(line: 3, column: 15, scope: !4)
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!14 = !DILocation(line: 4, column: 3, scope: !4)
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!15 = !DILocation(line: 4, column: 9, scope: !4)
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!16 = !DILocation(line: 4, column: 15, scope: !4)
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!17 = !DILocation(line: 5, column: 1, scope: !4)
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