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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
45 lines
1.8 KiB
LLVM
45 lines
1.8 KiB
LLVM
; The loop canonicalization pass should guarantee that there is one backedge
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; for all loops. This allows the -indvars pass to recognize the %IV
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; induction variable in this testcase.
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; RUN: opt < %s -indvars -S | FileCheck %s
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; CHECK: Loop.backedge:
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; CHECK-NOT: br
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; CHECK: br label %Loop, !dbg [[BACKEDGE_LOC:![0-9]+]]
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; CHECK: [[BACKEDGE_LOC]] = !DILocation(line: 101, column: 1, scope: !{{.*}})
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define i32 @test(i1 %C) {
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; <label>:0
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br label %Loop, !dbg !6
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Loop: ; preds = %BE2, %BE1, %0
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%IV = phi i32 [ 1, %0 ], [ %IV2, %BE1 ], [ %IV2, %BE2 ] ; <i32> [#uses=2]
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store i32 %IV, i32* null, !dbg !7
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%IV2 = add i32 %IV, 2, !dbg !8 ; <i32> [#uses=2]
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br i1 %C, label %BE1, label %BE2, !dbg !9
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BE1: ; preds = %Loop
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br label %Loop, !dbg !10
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BE2: ; preds = %n br label %Loop
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br label %Loop, !dbg !11
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}
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!llvm.module.flags = !{!0, !1}
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!llvm.dbg.cu = !{!12}
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!0 = !{i32 2, !"Dwarf Version", i32 4}
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!1 = !{i32 2, !"Debug Info Version", i32 3}
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!2 = !{}
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!3 = !DISubroutineType(types: !2)
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!4 = !DIFile(filename: "atomic.cpp", directory: "/tmp")
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!5 = distinct !DISubprogram(name: "test", scope: !4, file: !4, line: 99, type: !3, isLocal: false, isDefinition: true, scopeLine: 100, flags: DIFlagPrototyped, isOptimized: false, unit: !12, variables: !2)
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!6 = !DILocation(line: 100, column: 1, scope: !5)
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!7 = !DILocation(line: 101, column: 1, scope: !5)
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!8 = !DILocation(line: 102, column: 1, scope: !5)
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!9 = !DILocation(line: 103, column: 1, scope: !5)
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!10 = !DILocation(line: 104, column: 1, scope: !5)
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!11 = !DILocation(line: 105, column: 1, scope: !5)
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!12 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang",
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file: !4,
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isOptimized: true, flags: "-O2",
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splitDebugFilename: "abc.debug", emissionKind: 2)
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