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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
43 lines
2.0 KiB
LLVM
43 lines
2.0 KiB
LLVM
; RUN: llc -mtriple=x86_64-unknown-linux-gnu < %s | FileCheck %s --check-prefix=LINUX
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; RUN: llc -mtriple=x86_64-darwin < %s | FileCheck %s --check-prefix=DARWIN
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@yyyy = common global i32 0, align 4
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!9}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.1 (trunk 143009)", isOptimized: true, emissionKind: FullDebug, file: !8, enums: !1, retainedTypes: !1, globals: !3, imports: !1)
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!1 = !{}
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!3 = !{!5}
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!5 = !DIGlobalVariable(name: "yyyy", line: 1, isLocal: false, isDefinition: true, scope: null, file: !6, type: !7, variable: i32* @yyyy)
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!6 = !DIFile(filename: "z.c", directory: "/home/nicholas")
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!7 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!8 = !DIFile(filename: "z.c", directory: "/home/nicholas")
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; Verify that "yyyy" ended up in the stringpool.
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; LINUX: .section .debug_str,"MS",@progbits,1
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; LINUX: yyyy
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; DARWIN: .section __DWARF,__debug_str,regular,debug
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; DARWIN: .asciz "yyyy" ## string offset=[[YYYY:[0-9]+]]
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; Verify that we refer to 'yyyy' with a relocation.
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; LINUX: .long .Linfo_string3 # DW_AT_name
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; LINUX-NEXT: .long {{[0-9]+}} # DW_AT_type
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; LINUX-NEXT: # DW_AT_external
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; LINUX-NEXT: .byte 1 # DW_AT_decl_file
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; LINUX-NEXT: .byte 1 # DW_AT_decl_line
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; LINUX-NEXT: .byte 9 # DW_AT_location
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; LINUX-NEXT: .byte 3
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; LINUX-NEXT: .quad yyyy
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; Verify that we refer to 'yyyy' with a direct offset.
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; DARWIN: .long [[YYYY]]
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; DARWIN-NEXT: .long {{[0-9]+}} ## DW_AT_type
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; DARWIN-NEXT: ## DW_AT_external
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; DARWIN-NEXT: .byte 1 ## DW_AT_decl_file
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; DARWIN-NEXT: .byte 1 ## DW_AT_decl_line
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; DARWIN-NEXT: .byte 9 ## DW_AT_location
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; DARWIN-NEXT: .byte 3
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; DARWIN-NEXT: .quad _yyyy
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!9 = !{i32 1, !"Debug Info Version", i32 3}
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