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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
69 lines
2.4 KiB
YAML
69 lines
2.4 KiB
YAML
# RUN: llc -march=x86-64 -start-after machine-sink -stop-after machine-sink -o /dev/null %s 2>&1 | FileCheck %s
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# This test ensures that the MIR parser parses the stack object's debug info
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# correctly.
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--- |
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #0
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define void @foo() #1 {
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entry:
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%x.i = alloca i8, align 1
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%y.i = alloca [256 x i8], align 16
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%0 = bitcast [256 x i8]* %y.i to i8*
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br label %for.body
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for.body:
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%1 = bitcast [256 x i8]* %y.i to i8*
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call void @llvm.lifetime.end(i64 -1, i8* %1) #3
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call void @llvm.lifetime.start(i64 -1, i8* %0) #3
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call void @llvm.dbg.declare(metadata i8* %0, metadata !4, metadata !7) #3, !dbg !8
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br label %for.body
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}
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declare void @llvm.lifetime.start(i64, i8* nocapture) #2
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declare void @llvm.lifetime.end(i64, i8* nocapture) #2
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attributes #0 = { nounwind readnone }
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attributes #1 = { nounwind ssp uwtable }
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attributes #2 = { nounwind argmemonly }
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attributes #3 = { nounwind }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3}
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!0 = distinct !DICompileUnit(language: DW_LANG_C89, file: !1, producer: "clang", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !2)
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!1 = !DIFile(filename: "t.c", directory: "")
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!2 = !{}
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!3 = !{i32 1, !"Debug Info Version", i32 3}
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!4 = !DILocalVariable(name: "x", scope: !5, file: !1, line: 16, type: !9)
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!5 = distinct !DISubprogram(scope: null, isLocal: false, isDefinition: true, isOptimized: false, unit: !0)
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!6 = !DIBasicType(name: "char", size: 8, align: 8, encoding: DW_ATE_signed_char)
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!7 = !DIExpression()
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!8 = !DILocation(line: 0, scope: !5)
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!9 = !DICompositeType(tag: DW_TAG_array_type, baseType: !6, size: 2048, align: 8, elements: !10)
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!10 = !{!11}
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!11 = !DISubrange(count: 256)
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...
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---
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name: foo
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isSSA: true
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tracksRegLiveness: true
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frameInfo:
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maxAlignment: 16
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# CHECK-LABEL: foo
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# CHECK: stack:
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# CHECK: - { id: 0, name: y.i, offset: 0, size: 256, alignment: 16, di-variable: '!4',
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# CHECK-NEXT: di-expression: '!10', di-location: '!11' }
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stack:
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- { id: 0, name: y.i, offset: 0, size: 256, alignment: 16, di-variable: '!4',
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di-expression: '!7', di-location: '!8' }
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body: |
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bb.0.entry:
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successors: %bb.1.for.body
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bb.1.for.body:
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successors: %bb.1.for.body
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DBG_VALUE %stack.0.y.i, 0, !4, !7, debug-location !8
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JMP_1 %bb.1.for.body
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...
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