75819aedf6
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
30 lines
1.2 KiB
LLVM
30 lines
1.2 KiB
LLVM
; RUN: llc -mtriple=powerpc64-unknown-linux-gnu -O0 -filetype=asm < %s | FileCheck %s
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; FIXME: add relocation and DWARF expression support to llvm-dwarfdump & use
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; that here instead of raw assembly printing
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; 10 bytes of data in this DW_FORM_block1 representation of the location of 'tls'
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; CHECK: .byte 10{{ *}}# DW_AT_location
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; DW_OP_const8u
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; CHECK: .byte 14
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; The debug relocation of the address of the tls variable
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; CHECK: .quad tls@DTPREL+32768
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; DW_OP_GNU_push_tls_address
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; CHECK: .byte 224
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@tls = thread_local global i32 7, align 4
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!7, !8}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.4 ", isOptimized: false, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !3, imports: !2)
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!1 = !DIFile(filename: "tls.cpp", directory: "/tmp")
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!2 = !{}
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!3 = !{!4}
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!4 = !DIGlobalVariable(name: "tls", line: 1, isLocal: false, isDefinition: true, scope: null, file: !5, type: !6, variable: i32* @tls)
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!5 = !DIFile(filename: "tls.cpp", directory: "/tmp")
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!6 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!7 = !{i32 2, !"Dwarf Version", i32 3}
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!8 = !{i32 1, !"Debug Info Version", i32 3}
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