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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
29 lines
1.3 KiB
LLVM
29 lines
1.3 KiB
LLVM
; RUN: llc %s -o %t -filetype=obj -mtriple=x86_64-unknown-linux-gnu
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; RUN: llvm-dwarfdump -debug-dump=line %t | FileCheck %s
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; PR13303
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; Check that the prologue ends with is_stmt here.
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; CHECK: 0x0000000000000000 {{.*}} is_stmt
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define i32 @main() nounwind uwtable !dbg !5 {
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entry:
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%retval = alloca i32, align 4
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store i32 0, i32* %retval
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ret i32 0, !dbg !10
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}
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!13}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.2 (trunk 160143)", isOptimized: false, emissionKind: FullDebug, file: !12, enums: !1, retainedTypes: !1, globals: !1, imports: !1)
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!1 = !{}
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!5 = distinct !DISubprogram(name: "main", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, unit: !0, scopeLine: 1, file: !12, scope: !6, type: !7, variables: !1)
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!6 = !DIFile(filename: "PR13303.c", directory: "/home/probinson")
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!7 = !DISubroutineType(types: !8)
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!8 = !{!9}
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!9 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!10 = !DILocation(line: 1, column: 14, scope: !11)
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!11 = distinct !DILexicalBlock(line: 1, column: 12, file: !12, scope: !5)
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!12 = !DIFile(filename: "PR13303.c", directory: "/home/probinson")
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!13 = !{i32 1, !"Debug Info Version", i32 3}
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