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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
72 lines
3.3 KiB
LLVM
72 lines
3.3 KiB
LLVM
; RUN: opt < %s -add-discriminators -S | FileCheck %s
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; Discriminator support for diamond-shaped CFG.:
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; #1 void bar(int);
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; #2
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; #3 void foo(int i) {
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; #4 if (i > 10)
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; #5 bar(5); else bar(3);
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; #6 }
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; bar(5): discriminator 0
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; bar(3): discriminator 1
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; Function Attrs: uwtable
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define void @_Z3fooi(i32 %i) #0 !dbg !4 {
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%1 = alloca i32, align 4
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store i32 %i, i32* %1, align 4
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call void @llvm.dbg.declare(metadata i32* %1, metadata !11, metadata !12), !dbg !13
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%2 = load i32, i32* %1, align 4, !dbg !14
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%3 = icmp sgt i32 %2, 10, !dbg !16
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br i1 %3, label %4, label %5, !dbg !17
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; <label>:4 ; preds = %0
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call void @_Z3bari(i32 5), !dbg !18
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br label %6, !dbg !18
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; <label>:5 ; preds = %0
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call void @_Z3bari(i32 3), !dbg !19
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; CHECK: call void @_Z3bari(i32 3), !dbg ![[ELSE:[0-9]+]]
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br label %6
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; <label>:6 ; preds = %5, %4
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ret void, !dbg !20
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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 void @_Z3bari(i32) #2
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attributes #0 = { 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"="+fxsr,+mmx,+sse,+sse2" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { nounwind readnone }
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attributes #2 = { "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"="+fxsr,+mmx,+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 = !{!8, !9}
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!llvm.ident = !{!10}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 3.8.0 (trunk 253273)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "a.cc", directory: "/tmp")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "foo", linkageName: "_Z3fooi", 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 = !{null, !7}
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!7 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!8 = !{i32 2, !"Dwarf Version", i32 4}
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!9 = !{i32 2, !"Debug Info Version", i32 3}
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!10 = !{!"clang version 3.8.0 (trunk 253273)"}
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!11 = !DILocalVariable(name: "i", arg: 1, scope: !4, file: !1, line: 3, type: !7)
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!12 = !DIExpression()
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!13 = !DILocation(line: 3, column: 14, scope: !4)
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!14 = !DILocation(line: 4, column: 7, scope: !15)
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!15 = distinct !DILexicalBlock(scope: !4, file: !1, line: 4, column: 7)
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!16 = !DILocation(line: 4, column: 9, scope: !15)
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!17 = !DILocation(line: 4, column: 7, scope: !4)
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!18 = !DILocation(line: 5, column: 5, scope: !15)
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!19 = !DILocation(line: 5, column: 18, scope: !15)
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!20 = !DILocation(line: 6, column: 1, scope: !4)
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; CHECK: ![[ELSE]] = !DILocation(line: 5, column: 18, scope: ![[ELSEBLOCK:[0-9]+]])
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; CHECK: ![[ELSEBLOCK]] = !DILexicalBlockFile({{.*}} discriminator: 1)
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