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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
50 lines
1.5 KiB
LLVM
50 lines
1.5 KiB
LLVM
; RUN: llvm-as < %s | llvm-dis | llvm-as | llvm-dis | FileCheck %s
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; RUN: verify-uselistorder %s
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; CHECK-LABEL: @test
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; CHECK: ret void, !bar !4, !foo !3
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define void @test() !dbg !1 {
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add i32 2, 1, !bar !0
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add i32 1, 2, !foo !1
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call void @llvm.dbg.func.start(metadata !"foo")
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extractvalue {{i32, i32}, i32} undef, 0, 1, !foo !0
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ret void, !foo !0, !bar !1
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}
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; CHECK-LABEL: define void @test2() !foo !5 !baz !6
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define void @test2() !foo !2 !baz !3 {
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unreachable
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}
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; CHECK-LABEL: define void @test3() !bar !6
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; CHECK: unreachable, !bar !7
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define void @test3() !bar !3 {
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unreachable, !bar !4
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}
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; CHECK-LABEL: define void @test_attachment_name() {
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; CHECK: unreachable, !\342abc !7
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define void @test_attachment_name() {
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;; Escape the first character when printing text IR, since it's a digit
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unreachable, !\34\32abc !4
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}
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!llvm.module.flags = !{!7}
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!llvm.dbg.cu = !{!5}
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!0 = !DILocation(line: 662302, column: 26, scope: !1)
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!1 = distinct !DISubprogram(name: "foo", isDefinition: true, unit: !5)
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!2 = distinct !{}
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!3 = distinct !{}
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!4 = distinct !{}
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!5 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang",
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file: !6,
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isOptimized: true, flags: "-O2",
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splitDebugFilename: "abc.debug", emissionKind: 2)
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!6 = !DIFile(filename: "path/to/file", directory: "/path/to/dir")
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!7 = !{i32 2, !"Debug Info Version", i32 3}
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declare void @llvm.dbg.func.start(metadata) nounwind readnone
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!foo = !{ !0 }
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!bar = !{ !1 }
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