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fb3abba237
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
47 lines
1.9 KiB
LLVM
47 lines
1.9 KiB
LLVM
; REQUIRES: object-emission
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; RUN: %llc_dwarf -O0 -filetype=obj < %s > %t
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; RUN: llvm-dwarfdump %t | FileCheck %s
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; Check that pointers and references get emitted without size information in
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; DWARF, even if they are so specified in the IR
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; CHECK: 0x[[O1:[0-9a-f]+]]: DW_TAG_pointer_type
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; CHECK-NEXT: DW_AT_type [DW_FORM_ref4]
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; CHECK-NOT: DW_AT_byte_size
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; CHECK: 0x[[O2:[0-9a-f]+]]: DW_TAG_
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; CHECK: 0x[[O3:[0-9a-f]+]]: DW_TAG_reference_type
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; CHECK-NEXT: DW_AT_type [DW_FORM_ref4]
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; CHECK-NOT: DW_AT_byte_size
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define i32 @foo() !dbg !4 {
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entry:
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ret i32 0, !dbg !13
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}
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define i32 @bar() !dbg !5 {
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entry:
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ret i32 0, !dbg !16
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}
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!11, !12}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "dwarf-test.c", directory: "test")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "foo", scope: !0, file: !1, line: 6, type: !6, isLocal: false, isDefinition: true, scopeLine: 6, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
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!5 = distinct !DISubprogram(name: "bar", scope: !0, file: !1, line: 6, type: !15, isLocal: false, isDefinition: true, scopeLine: 6, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
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!6 = !DISubroutineType(types: !7)
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!7 = !{!9}
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!8 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!9 = !DIDerivedType(tag: DW_TAG_pointer_type, scope: !0, baseType: !8, size: 64, align: 64)
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!10 = !DIDerivedType(tag: DW_TAG_reference_type, scope: !0, baseType: !8, size: 64, align: 64)
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!11 = !{i32 2, !"Dwarf Version", i32 3}
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!12 = !{i32 1, !"Debug Info Version", i32 3}
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!13 = !DILocation(line: 7, scope: !4)
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!14 = !{!10}
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!15 = !DISubroutineType(types: !14)
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!16 = !DILocation(line: 7, scope: !5)
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