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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> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@266446 91177308-0d34-0410-b5e6-96231b3b80d8
52 lines
2.6 KiB
LLVM
52 lines
2.6 KiB
LLVM
; RUN: llc -mtriple=x86_64-apple-darwin < %s | FileCheck %s
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; RUN: llc -mtriple=x86_64-apple-darwin -regalloc=basic < %s | FileCheck %s
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; Test to check separate label for inlined function argument.
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define i32 @foo(i32 %y) nounwind optsize ssp !dbg !1 {
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entry:
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tail call void @llvm.dbg.value(metadata i32 %y, i64 0, metadata !0, metadata !DIExpression()), !dbg !DILocation(scope: !1)
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%0 = tail call i32 (...) @zoo(i32 %y) nounwind, !dbg !9 ; <i32> [#uses=1]
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ret i32 %0, !dbg !9
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}
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declare i32 @zoo(...)
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnone
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define i32 @bar(i32 %x) nounwind optsize ssp !dbg !8 {
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entry:
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tail call void @llvm.dbg.value(metadata i32 %x, i64 0, metadata !7, metadata !DIExpression()), !dbg !DILocation(scope: !8)
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tail call void @llvm.dbg.value(metadata i32 1, i64 0, metadata !0, metadata !DIExpression()) nounwind, !dbg !DILocation(scope: !1, inlinedAt: !DILocation(scope: !8))
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%0 = tail call i32 (...) @zoo(i32 1) nounwind, !dbg !12 ; <i32> [#uses=1]
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%1 = add nsw i32 %0, %x, !dbg !13 ; <i32> [#uses=1]
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ret i32 %1, !dbg !13
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}
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!llvm.dbg.cu = !{!3}
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!llvm.module.flags = !{!20}
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!0 = !DILocalVariable(name: "y", line: 2, arg: 1, scope: !1, file: !2, type: !6)
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!1 = distinct !DISubprogram(name: "foo", linkageName: "foo", line: 2, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: true, unit: !3, scopeLine: 2, file: !18, scope: !2, type: !4, variables: !15)
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!2 = !DIFile(filename: "f.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: !18, enums: !19, retainedTypes: !19, imports: null)
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!4 = !DISubroutineType(types: !5)
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!5 = !{!6, !6}
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!6 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!7 = !DILocalVariable(name: "x", line: 6, arg: 1, scope: !8, file: !2, type: !6)
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!8 = distinct !DISubprogram(name: "bar", linkageName: "bar", line: 6, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: true, unit: !3, scopeLine: 6, file: !18, scope: !2, type: !4, variables: !16)
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!9 = !DILocation(line: 3, scope: !10)
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!10 = distinct !DILexicalBlock(line: 2, column: 0, file: !18, scope: !1)
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!11 = !{i32 1}
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!12 = !DILocation(line: 3, scope: !10, inlinedAt: !13)
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!13 = !DILocation(line: 7, scope: !14)
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!14 = distinct !DILexicalBlock(line: 6, column: 0, file: !18, scope: !8)
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!15 = !{!0}
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!16 = !{!7}
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!18 = !DIFile(filename: "f.c", directory: "/tmp")
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!19 = !{}
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;CHECK: DEBUG_VALUE: bar:x <- %E
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;CHECK: Ltmp
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;CHECK: DEBUG_VALUE: foo:y <- 1{{$}}
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!20 = !{i32 1, !"Debug Info Version", i32 3}
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