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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
102 lines
4.5 KiB
LLVM
102 lines
4.5 KiB
LLVM
; Test that alloca merging in the inliner places dbg.declare calls immediately
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; after the merged alloca. Not at the end of the entry BB, and definitely not
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; before the alloca.
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;
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; clang -g -S -emit-llvm -Xclang -disable-llvm-optzns
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;
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;__attribute__((always_inline)) void f() {
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; char aaa[100];
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; aaa[10] = 1;
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;}
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;
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;__attribute__((always_inline)) void g() {
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; char bbb[100];
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; bbb[20] = 1;
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;}
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;
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;void h() {
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; f();
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; g();
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;}
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;
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; RUN: opt -always-inline -S < %s | FileCheck %s
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;
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; CHECK: define void @h()
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; CHECK-NEXT: entry:
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; CHECK-NEXT: %[[AI:.*]] = alloca [100 x i8]
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; CHECK-NEXT: call void @llvm.dbg.declare(metadata [100 x i8]* %[[AI]],
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; CHECK-NEXT: call void @llvm.dbg.declare(metadata [100 x i8]* %[[AI]],
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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: alwaysinline nounwind uwtable
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define void @f() #0 !dbg !4 {
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entry:
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%aaa = alloca [100 x i8], align 16
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call void @llvm.dbg.declare(metadata [100 x i8]* %aaa, metadata !12, metadata !17), !dbg !18
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%arrayidx = getelementptr inbounds [100 x i8], [100 x i8]* %aaa, i64 0, i64 10, !dbg !19
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store i8 1, i8* %arrayidx, align 2, !dbg !20
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ret void, !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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; Function Attrs: alwaysinline nounwind uwtable
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define void @g() #0 !dbg !7 {
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entry:
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%bbb = alloca [100 x i8], align 16
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call void @llvm.dbg.declare(metadata [100 x i8]* %bbb, metadata !22, metadata !17), !dbg !23
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%arrayidx = getelementptr inbounds [100 x i8], [100 x i8]* %bbb, i64 0, i64 20, !dbg !24
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store i8 1, i8* %arrayidx, align 4, !dbg !25
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ret void, !dbg !26
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}
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; Function Attrs: nounwind uwtable
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define void @h() #2 !dbg !8 {
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entry:
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call void @f(), !dbg !27
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call void @g(), !dbg !28
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ret void, !dbg !29
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}
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attributes #0 = { alwaysinline nounwind uwtable "disable-tail-calls"="false" "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"="x86-64" "target-features"="+sse,+sse2" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { nounwind readnone }
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attributes #2 = { nounwind uwtable "disable-tail-calls"="false" "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"="x86-64" "target-features"="+sse,+sse2" "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}
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!llvm.ident = !{!11}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.8.0 (trunk 248518) (llvm/trunk 248512)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "../1.c", directory: "/code/llvm-git/build")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 1, type: !5, isLocal: false, isDefinition: true, scopeLine: 1, isOptimized: false, unit: !0, variables: !2)
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!5 = !DISubroutineType(types: !6)
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!6 = !{null}
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!7 = distinct !DISubprogram(name: "g", scope: !1, file: !1, line: 6, type: !5, isLocal: false, isDefinition: true, scopeLine: 6, isOptimized: false, unit: !0, variables: !2)
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!8 = distinct !DISubprogram(name: "h", scope: !1, file: !1, line: 11, type: !5, isLocal: false, isDefinition: true, scopeLine: 11, isOptimized: false, unit: !0, variables: !2)
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!9 = !{i32 2, !"Dwarf Version", i32 4}
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!10 = !{i32 2, !"Debug Info Version", i32 3}
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!11 = !{!"clang version 3.8.0 (trunk 248518) (llvm/trunk 248512)"}
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!12 = !DILocalVariable(name: "aaa", scope: !4, file: !1, line: 2, type: !13)
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!13 = !DICompositeType(tag: DW_TAG_array_type, baseType: !14, size: 800, align: 8, elements: !15)
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!14 = !DIBasicType(name: "char", size: 8, align: 8, encoding: DW_ATE_signed_char)
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!15 = !{!16}
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!16 = !DISubrange(count: 100)
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!17 = !DIExpression()
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!18 = !DILocation(line: 2, column: 8, scope: !4)
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!19 = !DILocation(line: 3, column: 3, scope: !4)
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!20 = !DILocation(line: 3, column: 11, scope: !4)
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!21 = !DILocation(line: 4, column: 1, scope: !4)
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!22 = !DILocalVariable(name: "bbb", scope: !7, file: !1, line: 7, type: !13)
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!23 = !DILocation(line: 7, column: 8, scope: !7)
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!24 = !DILocation(line: 8, column: 3, scope: !7)
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!25 = !DILocation(line: 8, column: 11, scope: !7)
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!26 = !DILocation(line: 9, column: 1, scope: !7)
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!27 = !DILocation(line: 12, column: 3, scope: !8)
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!28 = !DILocation(line: 13, column: 3, scope: !8)
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!29 = !DILocation(line: 14, column: 1, scope: !8)
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