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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
22 lines
941 B
LLVM
22 lines
941 B
LLVM
; RUN: llc -filetype=obj -O0 < %s -mtriple x86_64-none-linux | \
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; RUN: llvm-dwarfdump - 2>&1 | FileCheck %s
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; RUN: llc -filetype=obj -O0 < %s -mtriple i386-none-linux | \
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; RUN: llvm-dwarfdump - 2>&1 | FileCheck %s
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; RUN: llc -filetype=obj -O0 < %s -mtriple x86_64-none-mingw32 | \
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; RUN: llvm-dwarfdump - 2>&1 | FileCheck %s
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; RUN: llc -filetype=obj -O0 < %s -mtriple i386-none-mingw32 | \
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; RUN: llvm-dwarfdump - 2>&1 | FileCheck %s
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; CHECK-NOT: failed to compute relocation
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4}
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!llvm.ident = !{!5}
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!0 = distinct !DICompileUnit(file: !1, language: DW_LANG_C99, producer: "clang version 3.6.0 ", isOptimized: false, enums: !2, retainedTypes: !2, globals: !2, imports: !2, emissionKind: FullDebug)
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!1 = !DIFile(filename: "empty.c", directory: "/a")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{!"clang version 3.6.0 "}
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