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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
45 lines
1.3 KiB
LLVM
45 lines
1.3 KiB
LLVM
; RUN: opt < %s -always-inline -S | FileCheck %s
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; Test that the debug location is preserved when rewriting an inlined call as an invoke
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; CHECK: invoke void @test()
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; CHECK-NEXT: to label {{.*}} unwind label {{.*}}, !dbg [[INL_LOC:!.*]]
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; CHECK: [[SP:.*]] = distinct !DISubprogram(
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; CHECK: [[INL_LOC]] = !DILocation(line: 1, scope: [[SP]], inlinedAt: [[INL_AT:.*]])
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; CHECK: [[INL_AT]] = distinct !DILocation(line: 2, scope: [[SP]])
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declare void @test()
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declare i32 @__gxx_personality_v0(...)
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attributes #0 = { alwaysinline }
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define void @inl() #0 {
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call void @test(), !dbg !3
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ret void
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}
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define void @caller() personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
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invoke void @inl()
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to label %cont unwind label %lpad, !dbg !4
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cont:
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ret void
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lpad:
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landingpad { i8*, i32 }
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cleanup
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ret void
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}
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!llvm.module.flags = !{!1}
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!llvm.dbg.cu = !{!5}
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!1 = !{i32 2, !"Debug Info Version", i32 3}
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!2 = distinct !DISubprogram(unit: !5)
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!3 = !DILocation(line: 1, scope: !2)
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!4 = !DILocation(line: 2, scope: !2)
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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/davidino", directory: "/path/to/dir")
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