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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
42 lines
2.2 KiB
LLVM
42 lines
2.2 KiB
LLVM
; RUN: opt -S -O3 < %s | FileCheck %s
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; RUN: verify-uselistorder %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
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target triple = "x86_64-apple-darwin10.2"
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%struct.anon = type { i32, i32 }
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%struct.test = type { i64, %struct.anon, %struct.test* }
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@TestArrayPtr = global %struct.test* getelementptr inbounds ([10 x %struct.test], [10 x %struct.test]* @TestArray, i64 0, i64 3) ; <%struct.test**> [#uses=1]
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@TestArray = common global [10 x %struct.test] zeroinitializer, align 32 ; <[10 x %struct.test]*> [#uses=2]
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define i32 @main() nounwind readonly !dbg !1 {
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%diff1 = alloca i64 ; <i64*> [#uses=2]
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; CHECK: call void @llvm.dbg.value(metadata i64 72,
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call void @llvm.dbg.declare(metadata i64* %diff1, metadata !0, metadata !DIExpression()), !dbg !DILocation(scope: !1)
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store i64 72, i64* %diff1, align 8
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%v1 = load %struct.test*, %struct.test** @TestArrayPtr, align 8 ; <%struct.test*> [#uses=1]
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%v2 = ptrtoint %struct.test* %v1 to i64 ; <i64> [#uses=1]
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%v3 = sub i64 %v2, ptrtoint ([10 x %struct.test]* @TestArray to i64) ; <i64> [#uses=1]
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store i64 %v3, i64* %diff1, align 8
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ret i32 4, !dbg !DILocation(scope: !1)
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}
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!llvm.dbg.cu = !{!6}
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declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
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!7 = !{!1}
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!6 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.0 (trunk 131941)", isOptimized: true, emissionKind: FullDebug, file: !8, enums: !9, retainedTypes: !9)
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!0 = !DILocalVariable(name: "c", line: 2, scope: !1, file: !2, type: !5)
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!1 = distinct !DISubprogram(name: "main", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !6, scopeLine: 1, file: !8, scope: !2, type: !3)
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!2 = !DIFile(filename: "/d/j/debug-test.c", directory: "/Volumes/Data/b")
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!3 = !DISubroutineType(types: !4)
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!4 = !{!5}
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!5 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!8 = !DIFile(filename: "/d/j/debug-test.c", directory: "/Volumes/Data/b")
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!9 = !{}
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!llvm.module.flags = !{!10}
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!10 = !{i32 1, !"Debug Info Version", i32 3}
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