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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
71 lines
3.7 KiB
LLVM
71 lines
3.7 KiB
LLVM
; Generated from frame.c on Darwin with '-arch i386 -g -emit-llvm'
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; ModuleID = 'frame.c'
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target datalayout = "e-m:o-p:32:32-f64:32:64-f80:128-n8:16:32-S128"
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target triple = "i386-apple-macosx10.11.0"
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; Function Attrs: nounwind ssp
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define i32 @bar(i32 %b) #0 !dbg !4 {
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entry:
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%b.addr = alloca i32, align 4
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%var = alloca i32, align 4
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store i32 %b, i32* %b.addr, align 4
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call void @llvm.dbg.declare(metadata i32* %b.addr, metadata !13, metadata !14), !dbg !15
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call void @llvm.dbg.declare(metadata i32* %var, metadata !16, metadata !14), !dbg !17
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%0 = load i32, i32* %b.addr, align 4, !dbg !18
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%add = add nsw i32 %0, 1, !dbg !19
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store i32 %add, i32* %var, align 4, !dbg !17
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%call = call i32 @foo(i32* %var), !dbg !20
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ret i32 %call, !dbg !21
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}
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
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declare i32 @foo(i32*) #2
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; Function Attrs: nounwind ssp
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define i32 @baz(i32 %b) #0 !dbg !8 {
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entry:
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%b.addr = alloca i32, align 4
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store i32 %b, i32* %b.addr, align 4
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call void @llvm.dbg.declare(metadata i32* %b.addr, metadata !22, metadata !14), !dbg !23
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%0 = load i32, i32* %b.addr, align 4, !dbg !24
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%call = call i32 @bar(i32 %0), !dbg !25
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ret i32 %call, !dbg !26
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}
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attributes #0 = { nounwind ssp "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" "target-cpu"="yonah" "target-features"="+cx16,+sse,+sse2,+sse3" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { nounwind readnone }
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attributes #2 = { "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" "target-cpu"="yonah" "target-features"="+cx16,+sse,+sse2,+sse3" "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, !11}
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!llvm.ident = !{!12}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.7.0 (trunk 239176) (llvm/trunk 239190)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "frame.c", directory: "/tmp")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "bar", scope: !1, file: !1, line: 3, type: !5, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
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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 = distinct !DISubprogram(name: "baz", scope: !1, file: !1, line: 8, type: !5, isLocal: false, isDefinition: true, scopeLine: 8, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
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!9 = !{i32 2, !"Dwarf Version", i32 2}
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!10 = !{i32 2, !"Debug Info Version", i32 3}
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!11 = !{i32 1, !"PIC Level", i32 2}
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!12 = !{!"clang version 3.7.0 (trunk 239176) (llvm/trunk 239190)"}
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!13 = !DILocalVariable(name: "b", arg: 1, scope: !4, file: !1, line: 3, type: !7)
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!14 = !DIExpression()
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!15 = !DILocation(line: 3, column: 13, scope: !4)
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!16 = !DILocalVariable(name: "var", scope: !4, file: !1, line: 4, type: !7)
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!17 = !DILocation(line: 4, column: 6, scope: !4)
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!18 = !DILocation(line: 4, column: 12, scope: !4)
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!19 = !DILocation(line: 4, column: 14, scope: !4)
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!20 = !DILocation(line: 5, column: 9, scope: !4)
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!21 = !DILocation(line: 5, column: 2, scope: !4)
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!22 = !DILocalVariable(name: "b", arg: 1, scope: !8, file: !1, line: 8, type: !7)
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!23 = !DILocation(line: 8, column: 13, scope: !8)
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!24 = !DILocation(line: 9, column: 13, scope: !8)
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!25 = !DILocation(line: 9, column: 9, scope: !8)
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!26 = !DILocation(line: 9, column: 2, scope: !8)
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