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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
36 lines
1.5 KiB
LLVM
36 lines
1.5 KiB
LLVM
; RUN: llc < %s -asm-verbose=false -mtriple=x86_64-apple-darwin10 -use-unknown-locations | FileCheck %s
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; The divide instruction does not have a debug location. CodeGen should
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; represent this in the debug information. This is done by setting line
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; and column to 0
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; CHECK: leal
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; CHECK-NEXT: .loc 1 0 0
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; CHECK: cltd
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; CHECK-NEXT: idivl
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; CHECK-NEXT: .loc 1 4 3
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define i32 @foo(i32 %w, i32 %x, i32 %y, i32 %z) nounwind !dbg !1 {
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entry:
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%a = add i32 %w, %x, !dbg !8
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%b = sdiv i32 %a, %y
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%c = add i32 %b, %z, !dbg !8
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ret i32 %c, !dbg !8
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}
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!llvm.dbg.cu = !{!3}
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!llvm.module.flags = !{!12}
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!0 = !DILocalVariable(name: "x", line: 1, arg: 2, scope: !1, file: !2, type: !6)
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!1 = distinct !DISubprogram(name: "foo", linkageName: "foo", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, unit: !3, scopeLine: 1, file: !10, scope: !2, type: !4)
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!2 = !DIFile(filename: "test.c", directory: "/dir")
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!3 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "producer", isOptimized: false, emissionKind: FullDebug, file: !10, enums: !11, retainedTypes: !11)
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!4 = !DISubroutineType(types: !5)
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!5 = !{!6}
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!6 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!7 = distinct !DILexicalBlock(line: 1, column: 30, file: !10, scope: !1)
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!8 = !DILocation(line: 4, column: 3, scope: !7)
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!10 = !DIFile(filename: "test.c", directory: "/dir")
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!11 = !{}
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!12 = !{i32 1, !"Debug Info Version", i32 3}
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