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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
57 lines
2.6 KiB
LLVM
57 lines
2.6 KiB
LLVM
; RUN: %llc_dwarf -O0 -filetype=obj -o %t.o %s
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; RUN: llvm-dwarfdump -debug-dump=info %t.o | FileCheck %s
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; REQUIRES: object-emission
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target datalayout = "e-m:o-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
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target triple = "thumbv7-apple-unknown-macho"
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; generated from (-triple thumbv7-apple-unknown-macho -Os):
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; void f(_Complex double c) { c = 0; }
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; Function Attrs: nounwind readnone
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define arm_aapcscc void @f([2 x i64] %c.coerce) #0 !dbg !4 {
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entry:
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tail call void @llvm.dbg.declare(metadata { double, double }* undef, metadata !14, metadata !15), !dbg !16
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; The target has no native double type.
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; SROA split the complex value into two i64 values.
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; CHECK: DW_TAG_formal_parameter
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; CHECK-NEXT: DW_AT_location [DW_FORM_block1] (<0x04> 10 00 93 08 )
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; DW_AT_location ( constu 0x00000000, piece 0x00000008 )
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; CHECK-NEXT: DW_AT_name {{.*}} "c"
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tail call void @llvm.dbg.value(metadata i64 0, i64 0, metadata !14, metadata !17), !dbg !16
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; Manually removed to disable location list emission:
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; tail call void @llvm.dbg.value(metadata i64 0, i64 0, metadata !14, metadata !18), !dbg !16
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ret void, !dbg !19
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}
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #0
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #0
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attributes #0 = { nounwind readnone }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!9, !10, !11, !12}
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!llvm.ident = !{!13}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.9.0 (trunk 259998) (llvm/trunk 259999)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "<stdin>", directory: "/")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "f", scope: !5, file: !5, line: 1, type: !6, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
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!5 = !DIFile(filename: "test.c", directory: "/")
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!6 = !DISubroutineType(types: !7)
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!7 = !{null, !8}
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!8 = !DIBasicType(name: "complex", size: 128, align: 64, encoding: DW_ATE_complex_float)
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!9 = !{i32 2, !"Dwarf Version", i32 2}
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!10 = !{i32 2, !"Debug Info Version", i32 3}
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!11 = !{i32 1, !"wchar_size", i32 4}
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!12 = !{i32 1, !"min_enum_size", i32 4}
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!13 = !{!"clang version 3.9.0 (trunk 259998) (llvm/trunk 259999)"}
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!14 = !DILocalVariable(name: "c", arg: 1, scope: !4, file: !5, line: 1, type: !8)
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!15 = !DIExpression()
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!16 = !DILocation(line: 1, column: 24, scope: !4)
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!17 = !DIExpression(DW_OP_bit_piece, 0, 64)
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!18 = !DIExpression(DW_OP_bit_piece, 64, 64)
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!19 = !DILocation(line: 1, column: 36, scope: !4)
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