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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
88 lines
4.6 KiB
LLVM
88 lines
4.6 KiB
LLVM
; Do setup work for all below tests: generate bitcode and combined index
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; RUN: opt -module-summary %s -o %t.bc
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; RUN: opt -module-summary %p/Inputs/thinlto_funcimport_debug.ll -o %t2.bc
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; RUN: llvm-lto -thinlto -o %t3 %t.bc %t2.bc
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; If we import func1 and not func2 we should only link DISubprogram for func1
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; RUN: llvm-link %t2.bc -summary-index=%t3.thinlto.bc -import=func1:%t.bc -S | FileCheck %s
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; CHECK: declare i32 @func2
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; CHECK: define available_externally i32 @func1
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; Ensure that each subprogram points to the correct CU.
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; CHECK: ![[CU1:[0-9]+]] = distinct !DICompileUnit(
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; CHECK: ![[CU2:[0-9]+]] = distinct !DICompileUnit(
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; CHECK: distinct !DISubprogram(name: "main", {{.*}}, unit: ![[CU1]]
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; CHECK: distinct !DISubprogram(name: "func1", {{.*}}, unit: ![[CU2]]
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; CHECK-NOT: distinct !DISubprogram(name: "func2"
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; CHECK: distinct !DISubprogram(name: "func3", {{.*}}, unit: ![[CU2]]
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; CHECK: distinct !DISubprogram(name: "func4", {{.*}}, unit: ![[CU2]]
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; ModuleID = 'dbg.o'
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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; Function Attrs: nounwind readnone uwtable
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define i32 @func1(i32 %n) #0 !dbg !4 {
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entry:
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tail call void @llvm.dbg.value(metadata i32 %n, i64 0, metadata !9, metadata !17), !dbg !18
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tail call void @llvm.dbg.value(metadata i32 5, i64 0, metadata !10, metadata !17), !dbg !19
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%cmp = icmp sgt i32 %n, 10, !dbg !20
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%. = select i1 %cmp, i32 10, i32 5, !dbg !22
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tail call void @llvm.dbg.value(metadata i32 %., i64 0, metadata !10, metadata !17), !dbg !19
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ret i32 %., !dbg !23
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}
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; Function Attrs: nounwind readnone uwtable
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define i32 @func2(i32 %n) #0 !dbg !11 {
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entry:
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tail call void @llvm.dbg.value(metadata i32 %n, i64 0, metadata !13, metadata !17), !dbg !24
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ret i32 %n, !dbg !25
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}
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #1
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attributes #0 = { nounwind readnone 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 = { nounwind readnone }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!14, !15}
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!llvm.ident = !{!16}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.8.0 (trunk 251407) (llvm/trunk 251401)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "dbg.c", directory: ".")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "func1", scope: !1, file: !1, line: 1, type: !5, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !8)
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!5 = !DISubroutineType(types: !6)
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!6 = !{!7, !7}
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!7 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!8 = !{!9, !10}
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!9 = !DILocalVariable(name: "n", arg: 1, scope: !4, file: !1, line: 1, type: !7)
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!10 = !DILocalVariable(name: "x", scope: !4, file: !1, line: 2, type: !7)
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!11 = distinct !DISubprogram(name: "func2", scope: !1, file: !1, line: 8, type: !5, isLocal: false, isDefinition: true, scopeLine: 8, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !12)
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!12 = !{!13}
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!13 = !DILocalVariable(name: "n", arg: 1, scope: !11, file: !1, line: 8, type: !7)
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!14 = !{i32 2, !"Dwarf Version", i32 4}
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!15 = !{i32 2, !"Debug Info Version", i32 3}
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!16 = !{!"clang version 3.8.0 (trunk 251407) (llvm/trunk 251401)"}
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!17 = !DIExpression()
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!18 = !DILocation(line: 1, column: 15, scope: !4)
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!19 = !DILocation(line: 2, column: 7, scope: !4)
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!20 = !DILocation(line: 3, column: 9, scope: !21, inlinedAt: !26)
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!21 = distinct !DILexicalBlock(scope: !27, file: !1, line: 3, column: 7)
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!22 = !DILocation(line: 3, column: 7, scope: !4)
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!23 = !DILocation(line: 5, column: 3, scope: !4)
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!24 = !DILocation(line: 8, column: 15, scope: !11)
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!25 = !DILocation(line: 9, column: 3, scope: !11)
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!26 = !DILocation(line: 9, column: 3, scope: !4)
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!27 = distinct !DISubprogram(name: "func3", scope: !1, file: !1, line: 8, type: !5, isLocal: false, isDefinition: true, scopeLine: 8, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !28)
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!28 = !{!29}
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!29 = !DILocalVariable(name: "n", arg: 1, scope: !30, file: !1, line: 8, type: !7)
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!30 = distinct !DISubprogram(name: "func4", scope: !1, file: !1, line: 8, type: !5, isLocal: false, isDefinition: true, scopeLine: 8, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !31)
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!31 = !{!32}
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!32 = !DILocalVariable(name: "n", arg: 1, scope: !30, file: !1, line: 8, type: !7)
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