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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
26 lines
1.3 KiB
LLVM
26 lines
1.3 KiB
LLVM
; ModuleID = '/Volumes/Data/apple-internal/llvm/tools/clang/test/Modules/debug-info-moduleimport.m'
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; RUN: llc %s -o %t -filetype=obj
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; RUN: llvm-dwarfdump -debug-dump=info %t | FileCheck %s
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; CHECK: DW_TAG_module
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; CHECK-NEXT: DW_AT_name {{.*}}"DebugModule"
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; CHECK-NEXT: DW_AT_LLVM_config_macros {{.*}}"-DMODULES=0"
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; CHECK-NEXT: DW_AT_LLVM_include_path {{.*}}"/llvm/tools/clang/test/Modules/Inputs"
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; CHECK-NEXT: DW_AT_LLVM_isysroot {{.*}}"/"
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx"
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!6, !7}
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!llvm.ident = !{!8}
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!0 = distinct !DICompileUnit(language: DW_LANG_ObjC, file: !1, producer: "LLVM version 3.7.0", isOptimized: false, runtimeVersion: 2, emissionKind: FullDebug, enums: !2, retainedTypes: !2, globals: !2, imports: !3)
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!1 = !DIFile(filename: "/llvm/tools/clang/test/Modules/<stdin>", directory: "/")
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!2 = !{}
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!3 = !{!4}
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!4 = !DIImportedEntity(tag: DW_TAG_imported_declaration, scope: !0, entity: !5, line: 5)
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!5 = !DIModule(scope: null, name: "DebugModule", configMacros: "-DMODULES=0", includePath: "/llvm/tools/clang/test/Modules/Inputs", isysroot: "/")
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!6 = !{i32 2, !"Dwarf Version", i32 4}
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!7 = !{i32 2, !"Debug Info Version", i32 3}
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!8 = !{!"LLVM version 3.7.0"}
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