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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
75 lines
2.9 KiB
LLVM
75 lines
2.9 KiB
LLVM
; RUN: llc -mcpu=core2 -mtriple=i686-pc-win32 -O0 < %s | FileCheck --check-prefix=X86 %s
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; This LL file was generated by running clang on the following code:
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; D:\test.cpp:
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; 1 void foo();
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; 2
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; 3 static void bar(int arg, ...) {
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; 4 foo();
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; 5 }
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; 6
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; 7 void spam(void) {
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; 8 bar(42);
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; 9 }
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;
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; The bar function happens to have no lexical scopes, yet it has one instruction
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; with debug information available. This used to be PR19239.
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; X86: .cv_file 1 "D:\\test.cpp"
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; X86-LABEL: {{^}}"?bar@@YAXHZZ":
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; X86: .cv_loc 1 1 4 0
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; X86: jmp "?foo@@YAXXZ"
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; X86: [[END_OF_BAR:.?Lfunc_end.*]]:{{$}}
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; X86-NOT: ret
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; X86-LABEL: .section .debug$S,"dr"
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; X86: .secrel32 "?bar@@YAXHZZ"
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; X86-NEXT: .secidx "?bar@@YAXHZZ"
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; X86: .cv_linetable 1, "?bar@@YAXHZZ", [[END_OF_BAR]]
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; X86: .cv_filechecksums
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; X86: .cv_stringtable
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; ModuleID = 'test.cpp'
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target datalayout = "e-m:w-p:32:32-i64:64-f80:32-n8:16:32-S32"
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target triple = "i686-pc-win32"
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; Function Attrs: nounwind
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define void @"\01?spam@@YAXXZ"() #0 !dbg !4 {
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entry:
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tail call void @"\01?bar@@YAXHZZ"(), !dbg !11
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ret void, !dbg !12
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}
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; Function Attrs: nounwind
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define internal void @"\01?bar@@YAXHZZ"() #0 !dbg !7 {
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entry:
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tail call void @"\01?foo@@YAXXZ"() #2, !dbg !13
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ret void, !dbg !14
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}
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declare void @"\01?foo@@YAXXZ"() #1
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attributes #0 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #2 = { nounwind }
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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, producer: "clang version 3.5.0 ", isOptimized: true, emissionKind: LineTablesOnly, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "test.cpp", directory: "D:\5C")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "spam", line: 7, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 7, file: !1, scope: !5, type: !6, variables: !2)
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!5 = !DIFile(filename: "test.cpp", directory: "D:C")
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!6 = !DISubroutineType(types: !2)
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!7 = distinct !DISubprogram(name: "bar", line: 3, isLocal: true, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 3, file: !1, scope: !5, type: !6, variables: !2)
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!8 = !{i32 2, !"CodeView", i32 1}
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!9 = !{i32 1, !"Debug Info Version", i32 3}
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!10 = !{!"clang version 3.5.0 "}
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!11 = !DILocation(line: 8, scope: !4)
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!12 = !DILocation(line: 9, scope: !4)
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!13 = !DILocation(line: 4, scope: !7)
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!14 = !DILocation(line: 5, scope: !7)
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