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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
29 lines
972 B
LLVM
29 lines
972 B
LLVM
; RUN: opt < %s -argpromotion -S | FileCheck %s
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declare void @sink(i32)
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; CHECK: define internal void @test({{.*}} !dbg [[SP:![0-9]+]]
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define internal void @test(i32** %X) !dbg !2 {
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%1 = load i32*, i32** %X, align 8
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%2 = load i32, i32* %1, align 8
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call void @sink(i32 %2)
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ret void
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}
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define void @caller(i32** %Y) {
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; CHECK: call void @test(i32 %
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call void @test(i32** %Y)
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ret void
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}
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; CHECK: [[SP]] = distinct !DISubprogram(name: "test",
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!llvm.module.flags = !{!0}
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!llvm.dbg.cu = !{!3}
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!0 = !{i32 2, !"Debug Info Version", i32 3}
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!1 = !DILocation(line: 8, scope: !2)
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!2 = distinct !DISubprogram(name: "test", line: 3, isLocal: true, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !3, scopeLine: 3, scope: null)
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!3 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0 ", isOptimized: false, emissionKind: LineTablesOnly, file: !5)
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!5 = !DIFile(filename: "test.c", directory: "")
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