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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
59 lines
3.2 KiB
LLVM
59 lines
3.2 KiB
LLVM
; RUN: llvm-link %s %p/DbgDeclare2.ll -o %t.bc
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; RUN: llvm-dis < %t.bc | FileCheck %s
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; Test if metadata in dbg.declare is mapped properly or not.
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; rdar://13089880
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; CHECK: define i32 @main(i32 %argc, i8** %argv)
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; CHECK: call void @llvm.dbg.declare(metadata i32* %argc.addr, metadata !{{[0-9]+}}, metadata {{.*}})
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; CHECK: call void @llvm.dbg.declare(metadata i8*** %argv.addr, metadata !{{[0-9]+}}, metadata {{.*}})
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; CHECK: define void @test(i32 %argc, i8** %argv)
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; CHECK: call void @llvm.dbg.declare(metadata i32* %argc.addr, metadata !{{[0-9]+}}, metadata {{.*}})
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; CHECK: call void @llvm.dbg.declare(metadata i8*** %argv.addr, metadata !{{[0-9]+}}, metadata {{.*}})
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; CHECK: call void @llvm.dbg.declare(metadata i32* %i, metadata !{{[0-9]+}}, metadata {{.*}})
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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-S128"
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target triple = "x86_64-apple-macosx10.9.0"
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define i32 @main(i32 %argc, i8** %argv) uwtable ssp !dbg !5 {
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entry:
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%retval = alloca i32, align 4
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%argc.addr = alloca i32, align 4
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%argv.addr = alloca i8**, align 8
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store i32 0, i32* %retval
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store i32 %argc, i32* %argc.addr, align 4
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call void @llvm.dbg.declare(metadata i32* %argc.addr, metadata !14, metadata !DIExpression()), !dbg !15
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store i8** %argv, i8*** %argv.addr, align 8
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call void @llvm.dbg.declare(metadata i8*** %argv.addr, metadata !16, metadata !DIExpression()), !dbg !15
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%0 = load i32, i32* %argc.addr, align 4, !dbg !17
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%1 = load i8**, i8*** %argv.addr, align 8, !dbg !17
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call void @test(i32 %0, i8** %1), !dbg !17
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ret i32 0, !dbg !19
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}
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declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
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declare void @test(i32, i8**)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!21}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.3 (trunk 173515)", isOptimized: true, emissionKind: FullDebug, file: !20, enums: !2, retainedTypes: !2, globals: !2)
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!2 = !{}
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!5 = distinct !DISubprogram(name: "main", line: 3, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 4, file: !20, scope: null, type: !7, variables: !2)
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!6 = !DIFile(filename: "main.cpp", directory: "/private/tmp")
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!7 = !DISubroutineType(types: !8)
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!8 = !{!9, !9, !10}
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!9 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!10 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !11)
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!11 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !12)
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!12 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !13)
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!13 = !DIBasicType(tag: DW_TAG_base_type, name: "char", size: 8, align: 8, encoding: DW_ATE_signed_char)
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!14 = !DILocalVariable(name: "argc", line: 3, arg: 1, scope: !5, file: !6, type: !9)
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!15 = !DILocation(line: 3, scope: !5)
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!16 = !DILocalVariable(name: "argv", line: 3, arg: 2, scope: !5, file: !6, type: !10)
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!17 = !DILocation(line: 5, scope: !18)
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!18 = distinct !DILexicalBlock(line: 4, column: 0, file: !20, scope: !5)
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!19 = !DILocation(line: 6, scope: !18)
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!20 = !DIFile(filename: "main.cpp", directory: "/private/tmp")
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!21 = !{i32 1, !"Debug Info Version", i32 3}
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