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[ThinLTO] Find all needed metadata when linking metadata as postpass

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For metadata postpass linking, after importing all functions, we need
to recursively walk through any nodes reached via imported functions to
locate needed subprogram metadata. Some might only be reached indirectly
via the variable list for an inlined function.

llvm-svn: 258728
This commit is contained in:
Teresa Johnson
2016-01-25 22:04:56 +00:00
parent a63717e4c0
commit a52cfbb4e3
2 changed files with 40 additions and 9 deletions
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16
test/Linker/thinlto_funcimport_debug.ll
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@@ -18,6 +18,8 @@
; CHECK: distinct !DISubprogram(name: "func1"
; CHECK-NOT: distinct !DISubprogram(name: "func2"
; CHECK: distinct !DISubprogram(name: "func3"
; CHECK: distinct !DISubprogram(name: "func4"
; ModuleID = 'dbg.o'
@@ -55,7 +57,7 @@ attributes #1 = { nounwind readnone }
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.8.0 (trunk 251407) (llvm/trunk 251401)", isOptimized: true, runtimeVersion: 0, emissionKind: 1, enums: !2, subprograms: !3)
!1 = !DIFile(filename: "dbg.c", directory: ".")
!2 = !{}
!3 = !{!4, !11}
!3 = !{!4, !11, !27, !30}
!4 = distinct !DISubprogram(name: "func1", scope: !1, file: !1, line: 1, type: !5, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: true, variables: !8)
!5 = !DISubroutineType(types: !6)
!6 = !{!7, !7}
@@ -72,9 +74,17 @@ attributes #1 = { nounwind readnone }
!17 = !DIExpression()
!18 = !DILocation(line: 1, column: 15, scope: !4)
!19 = !DILocation(line: 2, column: 7, scope: !4)
!20 = !DILocation(line: 3, column: 9, scope: !21)
!21 = distinct !DILexicalBlock(scope: !4, file: !1, line: 3, column: 7)
!20 = !DILocation(line: 3, column: 9, scope: !21, inlinedAt: !26)
!21 = distinct !DILexicalBlock(scope: !27, file: !1, line: 3, column: 7)
!22 = !DILocation(line: 3, column: 7, scope: !4)
!23 = !DILocation(line: 5, column: 3, scope: !4)
!24 = !DILocation(line: 8, column: 15, scope: !11)
!25 = !DILocation(line: 9, column: 3, scope: !11)
!26 = !DILocation(line: 9, column: 3, scope: !4)
!27 = distinct !DISubprogram(name: "func3", scope: !1, file: !1, line: 8, type: !5, isLocal: false, isDefinition: true, scopeLine: 8, flags: DIFlagPrototyped, isOptimized: true, variables: !28)
!28 = !{!29}
!29 = !DILocalVariable(name: "n", arg: 1, scope: !30, file: !1, line: 8, type: !7)
!30 = distinct !DISubprogram(name: "func4", scope: !1, file: !1, line: 8, type: !5, isLocal: false, isDefinition: true, scopeLine: 8, flags: DIFlagPrototyped, isOptimized: true, variables: !31)
!31 = !{!32}
!32 = !DILocalVariable(name: "n", arg: 1, scope: !30, file: !1, line: 8, type: !7)