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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
55 lines
2.2 KiB
LLVM
55 lines
2.2 KiB
LLVM
; From source:
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; int f(int a, int b) {
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; return a //
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; && //
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; b;
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; }
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; Check that the comparison of 'a' is attributed to line 2, not 3.
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; CHECK: .loc{{ +}}1{{ +}}2
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; CHECK-NOT: .loc{{ }}
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; CHECK: cmp
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; Function Attrs: nounwind uwtable
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define i32 @_Z1fii(i32 %a, i32 %b) #0 !dbg !4 {
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entry:
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%a.addr = alloca i32, align 4
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%b.addr = alloca i32, align 4
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store i32 %a, i32* %a.addr, align 4
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store i32 %b, i32* %b.addr, align 4
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%0 = load i32, i32* %a.addr, align 4, !dbg !10
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%tobool = icmp ne i32 %0, 0, !dbg !10
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br i1 %tobool, label %land.rhs, label %land.end, !dbg !11
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land.rhs: ; preds = %entry
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%1 = load i32, i32* %b.addr, align 4, !dbg !12
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%tobool1 = icmp ne i32 %1, 0, !dbg !12
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br label %land.end
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land.end: ; preds = %land.rhs, %entry
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%2 = phi i1 [ false, %entry ], [ %tobool1, %land.rhs ]
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%conv = zext i1 %2 to i32, !dbg !10
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ret i32 %conv, !dbg !13
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}
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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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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!7, !8}
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!llvm.ident = !{!9}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.7.0 (trunk 227472) (llvm/trunk 227476)", isOptimized: false, emissionKind: LineTablesOnly, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "line.cpp", directory: "/tmp/dbginfo")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "f", line: 1, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 1, file: !1, scope: !5, type: !6, variables: !2)
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!5 = !DIFile(filename: "line.cpp", directory: "/tmp/dbginfo")
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!6 = !DISubroutineType(types: !2)
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!7 = !{i32 2, !"Dwarf Version", i32 4}
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!8 = !{i32 2, !"Debug Info Version", i32 3}
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!9 = !{!"clang version 3.7.0 (trunk 227472) (llvm/trunk 227476)"}
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!10 = !DILocation(line: 2, scope: !4)
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!11 = !DILocation(line: 3, scope: !4)
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!12 = !DILocation(line: 4, scope: !4)
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!13 = !DILocation(line: 2, scope: !4)
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