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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> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@266446 91177308-0d34-0410-b5e6-96231b3b80d8
58 lines
2.5 KiB
LLVM
58 lines
2.5 KiB
LLVM
; RUN: llc < %s -mtriple=i686-pc-linux | FileCheck %s
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; CHECK-LABEL: _Z3foov:
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; CHECK: .loc 1 4 3 prologue_end
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; CHECK: .cfi_escape 0x2e, 0x10
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define void @_Z3foov() #0 personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) !dbg !4 {
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entry:
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tail call void @_Z3bariii(i32 0, i32 1, i32 2) #1, !dbg !10
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invoke void @_Z3bariii(i32 4, i32 5, i32 6) #1
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to label %try.cont unwind label %lpad, !dbg !11
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lpad: ; preds = %entry
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%0 = landingpad { i8*, i32 }
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catch i8* null, !dbg !13
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%1 = extractvalue { i8*, i32 } %0, 0, !dbg !13
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%2 = tail call i8* @__cxa_begin_catch(i8* %1) #2, !dbg !14
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tail call void @__cxa_end_catch(), !dbg !15
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br label %try.cont, !dbg !15
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try.cont: ; preds = %entry, %lpad
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ret void, !dbg !17
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}
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; Function Attrs: optsize
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declare void @_Z3bariii(i32, i32, i32) #0
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declare i32 @__gxx_personality_v0(...)
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declare i8* @__cxa_begin_catch(i8*)
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declare void @__cxa_end_catch()
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attributes #0 = { optsize "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="pentium4" "target-features"="+sse,+sse2" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { optsize }
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attributes #2 = { nounwind }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!7, !8}
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!llvm.ident = !{!9}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 3.8.0 (trunk 249520)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "foo.cpp", directory: "foo")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "foo", linkageName: "_Z3foov", scope: !1, file: !1, line: 3, type: !5, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !2)
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!5 = !DISubroutineType(types: !6)
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!6 = !{null}
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!7 = !{i32 2, !"Dwarf Version", i32 4}
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!8 = !{i32 2, !"Debug Info Version", i32 3}
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!9 = !{!"clang version 3.8.0 (trunk 249520)"}
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!10 = !DILocation(line: 4, column: 3, scope: !4)
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!11 = !DILocation(line: 6, column: 5, scope: !12)
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!12 = distinct !DILexicalBlock(scope: !4, file: !1, line: 5, column: 7)
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!13 = !DILocation(line: 10, column: 1, scope: !12)
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!14 = !DILocation(line: 7, column: 3, scope: !12)
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!15 = !DILocation(line: 9, column: 3, scope: !16)
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!16 = distinct !DILexicalBlock(scope: !4, file: !1, line: 7, column: 17)
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!17 = !DILocation(line: 10, column: 1, scope: !4)
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