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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
44 lines
1.6 KiB
LLVM
44 lines
1.6 KiB
LLVM
; RUN: bugpoint -load %llvmshlibdir/BugpointPasses%shlibext %s -output-prefix %t -bugpoint-crashcalls -silence-passes -disable-namedmd-remove > /dev/null
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; RUN: llvm-dis %t-reduced-simplified.bc -o - | FileCheck %s
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; REQUIRES: loadable_module
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; Bugpoint should keep the call's metadata attached to the call.
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; CHECK: call void @foo(), !dbg ![[LOC:[0-9]+]], !attach ![[CALL:[0-9]+]]
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; CHECK-DAG: ![[LOC]] = !DILocation(line: 104, column: 105, scope: ![[SCOPE:[0-9]+]])
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; CHECK-DAG: ![[SCOPE]] = distinct !DISubprogram(name: "test",{{.*}}file: ![[FILE:[0-9]+]]
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; CHECK-DAG: ![[FILE]] = !DIFile(filename: "source.c", directory: "/dir")
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; CHECK-DAG: ![[CALL]] = !{!"the call to foo"}
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%rust_task = type {}
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define void @test(i32* %a, i8* %b) {
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%s = mul i8 22, 9, !attach !0, !dbg !10
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store i8 %s, i8* %b, !attach !1, !dbg !11
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call void @foo(), !attach !2, !dbg !12
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store i32 7, i32* %a, !attach !3, !dbg !13
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%t = add i32 0, 5, !attach !4, !dbg !14
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ret void
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}
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declare void @foo()
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!llvm.module.flags = !{!17}
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!llvm.dbg.cu = !{!8}
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!0 = !{!"boring"}
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!1 = !{!"uninteresting"}
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!2 = !{!"the call to foo"}
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!3 = !{!"noise"}
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!4 = !{!"filler"}
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!8 = distinct !DICompileUnit(language: DW_LANG_C99, file: !15)
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!9 = distinct !DISubprogram(name: "test", file: !15, unit: !8)
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!10 = !DILocation(line: 100, column: 101, scope: !9)
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!11 = !DILocation(line: 102, column: 103, scope: !9)
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!12 = !DILocation(line: 104, column: 105, scope: !9)
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!13 = !DILocation(line: 106, column: 107, scope: !9)
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!14 = !DILocation(line: 108, column: 109, scope: !9)
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!15 = !DIFile(filename: "source.c", directory: "/dir")
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!16 = !{}
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!17 = !{i32 1, !"Debug Info Version", i32 3}
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