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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
53 lines
3.0 KiB
LLVM
53 lines
3.0 KiB
LLVM
; RUN: opt < %s -mem2reg -S | FileCheck %s
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define double @testfunc(i32 %i, double %j) nounwind ssp !dbg !1 {
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entry:
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%i_addr = alloca i32 ; <i32*> [#uses=2]
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%j_addr = alloca double ; <double*> [#uses=2]
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%retval = alloca double ; <double*> [#uses=2]
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%0 = alloca double ; <double*> [#uses=2]
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%"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0]
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call void @llvm.dbg.declare(metadata i32* %i_addr, metadata !0, metadata !DIExpression()), !dbg !8
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; CHECK: call void @llvm.dbg.value(metadata i32 %i, i64 0, metadata ![[IVAR:[0-9]*]], metadata {{.*}})
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; CHECK: call void @llvm.dbg.value(metadata double %j, i64 0, metadata ![[JVAR:[0-9]*]], metadata {{.*}})
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; CHECK: ![[IVAR]] = !DILocalVariable(name: "i"
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; CHECK: ![[JVAR]] = !DILocalVariable(name: "j"
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store i32 %i, i32* %i_addr
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call void @llvm.dbg.declare(metadata double* %j_addr, metadata !9, metadata !DIExpression()), !dbg !8
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store double %j, double* %j_addr
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%1 = load i32, i32* %i_addr, align 4, !dbg !10 ; <i32> [#uses=1]
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%2 = add nsw i32 %1, 1, !dbg !10 ; <i32> [#uses=1]
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%3 = sitofp i32 %2 to double, !dbg !10 ; <double> [#uses=1]
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%4 = load double, double* %j_addr, align 8, !dbg !10 ; <double> [#uses=1]
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%5 = fadd double %3, %4, !dbg !10 ; <double> [#uses=1]
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store double %5, double* %0, align 8, !dbg !10
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%6 = load double, double* %0, align 8, !dbg !10 ; <double> [#uses=1]
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store double %6, double* %retval, align 8, !dbg !10
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br label %return, !dbg !10
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return: ; preds = %entry
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%retval1 = load double, double* %retval, !dbg !10 ; <double> [#uses=1]
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ret double %retval1, !dbg !10
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}
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declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
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!llvm.dbg.cu = !{!3}
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!llvm.module.flags = !{!14}
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!0 = !DILocalVariable(name: "i", line: 2, arg: 1, scope: !1, file: !2, type: !7)
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!1 = distinct !DISubprogram(name: "testfunc", linkageName: "testfunc", line: 2, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, unit: !3, scopeLine: 2, file: !12, scope: !2, type: !4)
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!2 = !DIFile(filename: "testfunc.c", directory: "/tmp")
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!3 = distinct !DICompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", isOptimized: true, emissionKind: FullDebug, file: !12, enums: !13, retainedTypes: !13)
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!4 = !DISubroutineType(types: !5)
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!5 = !{!6, !7, !6}
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!6 = !DIBasicType(tag: DW_TAG_base_type, name: "double", size: 64, align: 64, encoding: DW_ATE_float)
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!7 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!8 = !DILocation(line: 2, scope: !1)
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!9 = !DILocalVariable(name: "j", line: 2, arg: 2, scope: !1, file: !2, type: !6)
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!10 = !DILocation(line: 3, scope: !11)
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!11 = distinct !DILexicalBlock(line: 2, column: 0, file: !12, scope: !1)
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!12 = !DIFile(filename: "testfunc.c", directory: "/tmp")
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!13 = !{}
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!14 = !{i32 1, !"Debug Info Version", i32 3}
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