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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
71 lines
3.2 KiB
LLVM
71 lines
3.2 KiB
LLVM
; RUN: opt -deadargelim -S < %s | FileCheck %s
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; PR14016
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; Built with clang (then manually running -mem2reg with opt) from the following source:
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; static void f1(int, ...) {
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; }
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;
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; void f2() {
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; f1(1);
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; }
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; Test both varargs removal and removal of a traditional dead arg together, to
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; test both the basic functionality, and a particular wrinkle involving updating
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; the function->debug info mapping on update to ensure it's accurate when used
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; again for the next removal.
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; CHECK: define internal void @_ZL2f1iz({{.*}} !dbg [[SP:![0-9]+]]
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; CHECK: [[SP]] = distinct !DISubprogram(name: "f1"
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; Check that debug info metadata for subprograms stores pointers to
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; updated LLVM functions.
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; Function Attrs: uwtable
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define void @_Z2f2v() #0 !dbg !4 {
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entry:
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call void (i32, ...) @_ZL2f1iz(i32 1), !dbg !15
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ret void, !dbg !16
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}
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; Function Attrs: nounwind uwtable
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define internal void @_ZL2f1iz(i32, ...) #1 !dbg !8 {
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entry:
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call void @llvm.dbg.value(metadata i32 %0, i64 0, metadata !17, metadata !18), !dbg !19
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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) #2
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #2
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attributes #0 = { uwtable "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" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { nounwind uwtable "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" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #2 = { nounwind readnone }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!12, !13}
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!llvm.ident = !{!14}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.6.0 ", isOptimized: false, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "dbg.cpp", directory: "/tmp/dbginfo")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "f2", linkageName: "_Z2f2v", line: 4, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 4, file: !1, scope: !5, type: !6, variables: !2)
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!5 = !DIFile(filename: "dbg.cpp", directory: "/tmp/dbginfo")
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!6 = !DISubroutineType(types: !7)
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!7 = !{null}
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!8 = distinct !DISubprogram(name: "f1", linkageName: "_ZL2f1iz", line: 1, isLocal: true, isDefinition: true, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 1, file: !1, scope: !5, type: !9, variables: !2)
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!9 = !DISubroutineType(types: !10)
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!10 = !{null, !11, null}
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!11 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!12 = !{i32 2, !"Dwarf Version", i32 4}
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!13 = !{i32 2, !"Debug Info Version", i32 3}
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!14 = !{!"clang version 3.6.0 "}
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!15 = !DILocation(line: 5, column: 3, scope: !4)
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!16 = !DILocation(line: 6, column: 1, scope: !4)
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!17 = !DILocalVariable(name: "", line: 1, arg: 1, scope: !8, file: !5, type: !11)
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!18 = !DIExpression()
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!19 = !DILocation(line: 1, column: 19, scope: !8)
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!20 = !DILocation(line: 2, column: 1, scope: !8)
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