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fb3abba237
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
63 lines
2.7 KiB
LLVM
63 lines
2.7 KiB
LLVM
; RUN: opt %s -sroa -verify -S -o - | FileCheck %s
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; ModuleID = 'test.c'
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; Test that SROA updates the debug info correctly if an alloca was rewritten but
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; not partitioned into multiple allocas.
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;
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; CHECK: call void @llvm.dbg.value(metadata float %s.coerce, i64 0, metadata ![[VAR:[0-9]+]], metadata ![[EXPR:[0-9]+]])
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; CHECK: ![[VAR]] = !DILocalVariable(name: "s",{{.*}} line: 3,
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; CHECK: ![[EXPR]] = !DIExpression(
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; CHECK-NOT: DW_OP_bit_piece
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;
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; struct S { float f; };
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;
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; float foo(struct S s) {
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; return s.f;
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; }
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.10.0"
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%struct.S = type { float }
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; Function Attrs: nounwind ssp uwtable
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define float @foo(float %s.coerce) #0 !dbg !4 {
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entry:
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%s = alloca %struct.S, align 4
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%coerce.dive = getelementptr %struct.S, %struct.S* %s, i32 0, i32 0
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store float %s.coerce, float* %coerce.dive, align 1
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call void @llvm.dbg.declare(metadata %struct.S* %s, metadata !16, metadata !17), !dbg !18
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%f = getelementptr inbounds %struct.S, %struct.S* %s, i32 0, i32 0, !dbg !19
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%0 = load float, float* %f, align 4, !dbg !19
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ret float %0, !dbg !19
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}
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
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attributes #0 = { nounwind ssp uwtable }
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attributes #1 = { nounwind readnone }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!12, !13, !14}
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!llvm.ident = !{!15}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, 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: "test.c", directory: "/Volumes/Data/llvm/_build.ninja.debug")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "foo", line: 3, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 3, file: !1, scope: !5, type: !6, variables: !2)
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!5 = !DIFile(filename: "test.c", directory: "/Volumes/Data/llvm/_build.ninja.debug")
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!6 = !DISubroutineType(types: !7)
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!7 = !{!8, !9}
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!8 = !DIBasicType(tag: DW_TAG_base_type, name: "float", size: 32, align: 32, encoding: DW_ATE_float)
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!9 = !DICompositeType(tag: DW_TAG_structure_type, name: "S", line: 1, size: 32, align: 32, file: !1, elements: !10)
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!10 = !{!11}
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!11 = !DIDerivedType(tag: DW_TAG_member, name: "f", line: 1, size: 32, align: 32, file: !1, scope: !9, baseType: !8)
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!12 = !{i32 2, !"Dwarf Version", i32 2}
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!13 = !{i32 2, !"Debug Info Version", i32 3}
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!14 = !{i32 1, !"PIC Level", i32 2}
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!15 = !{!"clang version 3.6.0 "}
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!16 = !DILocalVariable(name: "s", line: 3, arg: 1, scope: !4, file: !5, type: !9)
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!17 = !DIExpression()
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!18 = !DILocation(line: 3, column: 20, scope: !4)
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!19 = !DILocation(line: 4, column: 2, scope: !4)
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