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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
40 lines
1.8 KiB
LLVM
40 lines
1.8 KiB
LLVM
; RUN: opt -analyze -module-debuginfo < %s | FileCheck %s
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; Produced from linking:
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; /tmp/test1.c containing f()
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; /tmp/test2.c containing g()
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; Verify that both compile units and both their contained functions are
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; listed by DebugInfoFinder:
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;CHECK: Compile unit: DW_LANG_C99 from /tmp/test1.c
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;CHECK: Compile unit: DW_LANG_C99 from /tmp/test2.c
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;CHECK: Subprogram: f from /tmp/test1.c:1
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;CHECK: Subprogram: g from /tmp/test2.c:1
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define void @f() !dbg !4 {
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ret void, !dbg !14
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}
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define void @g() !dbg !11 {
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ret void, !dbg !15
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}
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!llvm.dbg.cu = !{!0, !8}
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!llvm.module.flags = !{!13, !16}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.4 (192092)", isOptimized: false, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "test1.c", directory: "/tmp")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "f", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, unit: !0, scopeLine: 1, file: !1, scope: !5, type: !6, variables: !2)
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!5 = !DIFile(filename: "test1.c", directory: "/tmp")
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!6 = !DISubroutineType(types: !7)
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!7 = !{null}
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!8 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.4 (192092)", isOptimized: false, emissionKind: FullDebug, file: !9, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!9 = !DIFile(filename: "test2.c", directory: "/tmp")
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!11 = distinct !DISubprogram(name: "g", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, unit: !8, scopeLine: 1, file: !9, scope: !12, type: !6, variables: !2)
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!12 = !DIFile(filename: "test2.c", directory: "/tmp")
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!13 = !{i32 2, !"Dwarf Version", i32 4}
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!14 = !DILocation(line: 1, scope: !4)
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!15 = !DILocation(line: 1, scope: !11)
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!16 = !{i32 1, !"Debug Info Version", i32 3}
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