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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
48 lines
2.2 KiB
LLVM
48 lines
2.2 KiB
LLVM
; RUN: llc < %s -mtriple=x86_64-apple-macosx -enable-misched \
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; RUN: -verify-machineinstrs | FileCheck %s
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;
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; Test RegisterPressure handling of DBG_VALUE.
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;
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; CHECK: %entry
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; CHECK: DEBUG_VALUE: test:callback
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; CHECK: ret
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%struct.btCompoundLeafCallback = type { i32, i32 }
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declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
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define void @test() unnamed_addr uwtable ssp align 2 !dbg !2 {
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entry:
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%callback = alloca %struct.btCompoundLeafCallback, align 8
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br i1 undef, label %if.end, label %if.then
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if.then: ; preds = %entry
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unreachable
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if.end: ; preds = %entry
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call void @llvm.dbg.declare(metadata %struct.btCompoundLeafCallback* %callback, metadata !3, metadata !DIExpression()), !dbg !DILocation(scope: !2)
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%m = getelementptr inbounds %struct.btCompoundLeafCallback, %struct.btCompoundLeafCallback* %callback, i64 0, i32 1
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store i32 0, i32* undef, align 8
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%cmp12447 = icmp sgt i32 undef, 0
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br i1 %cmp12447, label %for.body.lr.ph, label %invoke.cont44
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for.body.lr.ph: ; preds = %if.end
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unreachable
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invoke.cont44: ; preds = %if.end
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ret void
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}
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!8}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.3 (trunk 168984) (llvm/trunk 168983)", isOptimized: true, emissionKind: FullDebug, file: !6)
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!2 = distinct !DISubprogram(name: "test", isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 1, file: !6, scope: !5, type: !7)
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!3 = !DILocalVariable(name: "callback", line: 214, scope: !2, type: !4)
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!4 = !DICompositeType(tag: DW_TAG_structure_type, name: "btCompoundLeafCallback", line: 90, size: 64, align: 64, file: !6)
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!5 = !DIFile(filename: "MultiSource/Benchmarks/Bullet/btCompoundCollisionAlgorithm.cpp", directory: "MultiSource/Benchmarks/Bullet")
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!6 = !DIFile(filename: "MultiSource/Benchmarks/Bullet/btCompoundCollisionAlgorithm.cpp", directory: "MultiSource/Benchmarks/Bullet")
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!7 = !DISubroutineType(types: !9)
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!8 = !{i32 1, !"Debug Info Version", i32 3}
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!9 = !{null}
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