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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
65 lines
3.2 KiB
LLVM
65 lines
3.2 KiB
LLVM
; RUN: llc -filetype=asm < %s | FileCheck %s
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; CHECK: @DEBUG_VALUE: h:x <- [%R{{.*}}+{{.*}}]
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; generated from:
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; clang -cc1 -triple thumbv7 -S -O1 arm.cpp -g
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;
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; int f();
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; void g(float);
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; void h(int, int, int, int, float x) {
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; g(x = f());
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; }
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;
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target datalayout = "e-p:32:32:32-i1:8:32-i8:8:32-i16:16:32-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:64:128-a0:0:32-n32-S64"
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target triple = "thumbv7-apple-ios"
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; Function Attrs: nounwind
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define arm_aapcscc void @_Z1hiiiif(i32, i32, i32, i32, float %x) #0 !dbg !4 {
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entry:
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tail call void @llvm.dbg.value(metadata i32 %0, i64 0, metadata !12, metadata !DIExpression()), !dbg !18
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tail call void @llvm.dbg.value(metadata i32 %1, i64 0, metadata !13, metadata !DIExpression()), !dbg !18
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tail call void @llvm.dbg.value(metadata i32 %2, i64 0, metadata !14, metadata !DIExpression()), !dbg !18
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tail call void @llvm.dbg.value(metadata i32 %3, i64 0, metadata !15, metadata !DIExpression()), !dbg !18
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tail call void @llvm.dbg.value(metadata float %x, i64 0, metadata !16, metadata !DIExpression()), !dbg !18
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%call = tail call arm_aapcscc i32 @_Z1fv() #3, !dbg !19
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%conv = sitofp i32 %call to float, !dbg !19
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tail call void @llvm.dbg.value(metadata float %conv, i64 0, metadata !16, metadata !DIExpression()), !dbg !19
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tail call arm_aapcscc void @_Z1gf(float %conv) #3, !dbg !19
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ret void, !dbg !20
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}
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declare arm_aapcscc void @_Z1gf(float)
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declare arm_aapcscc i32 @_Z1fv()
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #2
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attributes #0 = { nounwind }
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attributes #2 = { nounwind readnone }
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attributes #3 = { nounwind }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!17, !21}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.4 (trunk 190804) (llvm/trunk 190797)", isOptimized: true, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "/<unknown>", directory: "")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "h", linkageName: "_Z1hiiiif", line: 3, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 3, file: !5, scope: !6, type: !7, variables: !11)
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!5 = !DIFile(filename: "/arm.cpp", directory: "")
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!6 = !DIFile(filename: "/arm.cpp", directory: "")
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!7 = !DISubroutineType(types: !8)
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!8 = !{null, !9, !9, !9, !9, !10}
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!9 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!10 = !DIBasicType(tag: DW_TAG_base_type, name: "float", size: 32, align: 32, encoding: DW_ATE_float)
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!11 = !{!12, !13, !14, !15, !16}
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!12 = !DILocalVariable(name: "", line: 3, arg: 1, scope: !4, file: !6, type: !9)
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!13 = !DILocalVariable(name: "", line: 3, arg: 2, scope: !4, file: !6, type: !9)
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!14 = !DILocalVariable(name: "", line: 3, arg: 3, scope: !4, file: !6, type: !9)
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!15 = !DILocalVariable(name: "", line: 3, arg: 4, scope: !4, file: !6, type: !9)
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!16 = !DILocalVariable(name: "x", line: 3, arg: 5, scope: !4, file: !6, type: !10)
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!17 = !{i32 2, !"Dwarf Version", i32 4}
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!18 = !DILocation(line: 3, scope: !4)
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!19 = !DILocation(line: 4, scope: !4)
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!20 = !DILocation(line: 5, scope: !4)
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!21 = !{i32 1, !"Debug Info Version", i32 3}
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