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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
37 lines
1.5 KiB
LLVM
37 lines
1.5 KiB
LLVM
; RUN: llc -mcpu=corei7 -no-stack-coloring=false < %s
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; Make sure that we don't crash when dbg values are used.
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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-macosx10.8.0"
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declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
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define void @foo() nounwind uwtable ssp {
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entry:
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%x.i = alloca i8, align 1
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%y.i = alloca [256 x i8], align 16
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%0 = getelementptr inbounds [256 x i8], [256 x i8]* %y.i, i64 0, i64 0
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br label %for.body
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for.body:
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call void @llvm.lifetime.end(i64 -1, i8* %0) nounwind
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call void @llvm.lifetime.start(i64 -1, i8* %x.i) nounwind
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call void @llvm.dbg.declare(metadata i8* %x.i, metadata !22, metadata !DIExpression()) nounwind, !dbg !DILocation(scope: !2)
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br label %for.body
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}
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declare void @llvm.lifetime.start(i64, i8* nocapture) nounwind
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declare void @llvm.lifetime.end(i64, i8* nocapture) nounwind
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!23}
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!0 = distinct !DICompileUnit(language: DW_LANG_C89, producer: "clang", isOptimized: true, emissionKind: FullDebug, file: !1, enums: !{}, retainedTypes: !{})
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!1 = !DIFile(filename: "t.c", directory: "")
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!16 = !DIBasicType(tag: DW_TAG_base_type, name: "char", size: 8, align: 8, encoding: DW_ATE_signed_char)
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!2 = distinct !DISubprogram(unit: !0)
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!22 = !DILocalVariable(name: "x", line: 16, scope: !2, file: !1, type: !16)
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!23 = !{i32 1, !"Debug Info Version", i32 3}
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