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4eeaa0da04
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
72 lines
3.1 KiB
LLVM
72 lines
3.1 KiB
LLVM
; RUN: llc -mtriple=x86_64-windows-msvc < %s -filetype=obj | llvm-readobj -codeview - | FileCheck %s --check-prefix=OBJ
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; This LL file was generated by running 'clang -g -gcodeview' on the
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; following code:
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; void useint(int);
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; void constant_var() {
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; int x = 42;
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; useint(x);
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; useint(x);
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; }
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; FIXME: Find a way to describe variables optimized to constants.
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; OBJ: ProcStart {
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; OBJ: DisplayName: constant_var
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; OBJ: }
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; OBJ: Local {
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; OBJ-NEXT: Type: int (0x74)
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; OBJ-NEXT: Flags [ (0x100)
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; OBJ-NEXT: IsOptimizedOut (0x100)
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; OBJ-NEXT: ]
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; OBJ-NEXT: VarName: x
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; OBJ-NEXT: }
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; OBJ-NOT: DefRange
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; OBJ: ProcEnd
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; ModuleID = 't.cpp'
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target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-pc-windows-msvc18.0.0"
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; Function Attrs: nounwind uwtable
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define void @"\01?constant_var@@YAXXZ"() #0 !dbg !4 {
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entry:
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tail call void @llvm.dbg.value(metadata i32 42, i64 0, metadata !8, metadata !14), !dbg !15
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tail call void @"\01?useint@@YAXH@Z"(i32 42) #3, !dbg !16
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tail call void @"\01?useint@@YAXH@Z"(i32 42) #3, !dbg !17
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ret void, !dbg !18
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}
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declare void @"\01?useint@@YAXH@Z"(i32) #1
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #2
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attributes #0 = { nounwind 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" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2" "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" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #2 = { nounwind readnone }
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attributes #3 = { nounwind }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!10, !11, !12}
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!llvm.ident = !{!13}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 3.9.0 (trunk 260957)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "t.cpp", directory: "D:\5Csrc\5Cllvm\5Cbuild")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "constant_var", linkageName: "\01?constant_var@@YAXXZ", scope: !1, file: !1, line: 2, type: !5, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !7)
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!5 = !DISubroutineType(types: !6)
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!6 = !{null}
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!7 = !{!8}
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!8 = !DILocalVariable(name: "x", scope: !4, file: !1, line: 3, type: !9)
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!9 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!10 = !{i32 2, !"CodeView", i32 1}
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!11 = !{i32 2, !"Debug Info Version", i32 3}
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!12 = !{i32 1, !"PIC Level", i32 2}
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!13 = !{!"clang version 3.9.0 (trunk 260957)"}
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!14 = !DIExpression()
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!15 = !DILocation(line: 3, column: 7, scope: !4)
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!16 = !DILocation(line: 4, column: 3, scope: !4)
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!17 = !DILocation(line: 5, column: 3, scope: !4)
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!18 = !DILocation(line: 6, column: 1, scope: !4)
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