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[ThinLTO] Handle DISubprogram reached indirectly from DIImportedEntity

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Extend fix for PR26037 to identify DISubprogram reached from a
DIImportedEntity via a DILexicalBlock.

llvm-svn: 258722
This commit is contained in:
Teresa Johnson 2016-01-25 21:29:55 +00:00
parent 50d58058da
commit 8b2ed4fc5e
2 changed files with 28 additions and 4 deletions
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6
lib/Linker/IRMover.cpp
View File

@ -1205,14 +1205,16 @@ void IRLinker::findNeededSubprograms() {
assert(CU && "Expected valid compile unit");
// Ensure that we don't remove subprograms referenced by DIImportedEntity.
// It is not legal to have a DIImportedEntity with a null entity or scope.
// Using getDISubprogram handles the case where the subprogram is reached
// via an intervening DILexicalBlock.
// FIXME: The DISubprogram for functions not linked in but kept due to
// being referenced by a DIImportedEntity should also get their
// IsDefinition flag is unset.
SmallPtrSet<DISubprogram *, 8> ImportedEntitySPs;
for (auto *IE : CU->getImportedEntities()) {
if (auto *SP = dyn_cast<DISubprogram>(IE->getEntity()))
if (auto *SP = getDISubprogram(dyn_cast<MDNode>(IE->getEntity())))
ImportedEntitySPs.insert(SP);
if (auto *SP = dyn_cast<DISubprogram>(IE->getScope()))
if (auto *SP = getDISubprogram(dyn_cast<MDNode>(IE->getScope())))
ImportedEntitySPs.insert(SP);
}
for (auto *Op : CU->getSubprograms()) {

26
test/Linker/pr26037.ll
View File

@ -4,7 +4,12 @@
; CHECK: [[A:![0-9]+]] = distinct !DISubprogram(name: "a"
; CHECK: [[B:![0-9]+]] = distinct !DISubprogram(name: "b"
; CHECK: [[C:![0-9]+]] = distinct !DISubprogram(name: "c"
; CHECK: [[D:![0-9]+]] = distinct !DISubprogram(name: "d"
; CHECK: !DIImportedEntity({{.*}}, scope: [[B]], entity: [[A]]
; CHECK: !DIImportedEntity({{.*}}, scope: [[LBC:![0-9]+]], entity: [[LBD:![0-9]+]]
; CHECK: [[LBC]] = distinct !DILexicalBlock(scope: [[C]]
; CHECK: [[LBD]] = distinct !DILexicalBlock(scope: [[D]]
define void @_ZN1A1aEv() #0 !dbg !4 {
entry:
@ -16,6 +21,16 @@ entry:
ret void, !dbg !15
}
define void @_ZN1A1cEv() #0 !dbg !18 {
entry:
ret void, !dbg !21
}
define void @_ZN1A1dEv() #0 !dbg !20 {
entry:
ret void, !dbg !22
}
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!11, !12}
!llvm.ident = !{!13}
@ -23,16 +38,23 @@ entry:
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 3.8.0 (trunk 256934) (llvm/trunk 256936)", isOptimized: false, runtimeVersion: 0, emissionKind: 1, enums: !2, subprograms: !3, imports: !9)
!1 = !DIFile(filename: "a2.cc", directory: "")
!2 = !{}
!3 = !{!4, !8}
!3 = !{!4, !8, !18, !20}
!4 = distinct !DISubprogram(name: "a", linkageName: "_ZN1A1aEv", scope: !5, file: !1, line: 7, type: !6, isLocal: false, isDefinition: true, scopeLine: 7, flags: DIFlagPrototyped, isOptimized: false, variables: !2)
!5 = !DINamespace(name: "A", scope: null, file: !1, line: 1)
!6 = !DISubroutineType(types: !7)
!7 = !{null}
!8 = distinct !DISubprogram(name: "b", linkageName: "_ZN1A1bEv", scope: !5, file: !1, line: 8, type: !6, isLocal: false, isDefinition: true, scopeLine: 8, flags: DIFlagPrototyped, isOptimized: false, variables: !2)
!9 = !{!10}
!9 = !{!10, !16}
!10 = !DIImportedEntity(tag: DW_TAG_imported_declaration, scope: !8, entity: !4, line: 8)
!11 = !{i32 2, !"Dwarf Version", i32 4}
!12 = !{i32 2, !"Debug Info Version", i32 3}
!13 = !{!"clang version 3.8.0 (trunk 256934) (llvm/trunk 256936)"}
!14 = !DILocation(line: 7, column: 12, scope: !4)
!15 = !DILocation(line: 8, column: 24, scope: !8)
!16 = !DIImportedEntity(tag: DW_TAG_imported_declaration, scope: !17, entity: !19, line: 8)
!17 = distinct !DILexicalBlock(scope: !18, file: !1, line: 9, column: 8)
!18 = distinct !DISubprogram(name: "c", linkageName: "_ZN1A1cEv", scope: !5, file: !1, line: 9, type: !6, isLocal: false, isDefinition: true, scopeLine: 8, flags: DIFlagPrototyped, isOptimized: false, variables: !2)
!19 = distinct !DILexicalBlock(scope: !20, file: !1, line: 10, column: 8)
!20 = distinct !DISubprogram(name: "d", linkageName: "_ZN1A1dEv", scope: !5, file: !1, line: 10, type: !6, isLocal: false, isDefinition: true, scopeLine: 8, flags: DIFlagPrototyped, isOptimized: false, variables: !2)
!21 = !DILocation(line: 9, column: 8, scope: !18)
!22 = !DILocation(line: 10, column: 8, scope: !20)