1 files changed, 84 insertions, 0 deletions
diff --git a/test/DebugInfo/Generic/lto-comp-dir.ll b/test/DebugInfo/Generic/lto-comp-dir.ll
new file mode 100644
index 000000000000..8d5da504a82e
--- /dev/null
+++ b/test/DebugInfo/Generic/lto-comp-dir.ll
@@ -0,0 +1,84 @@
+; REQUIRES: object-emission
+
+; RUN: %llc_dwarf < %s -filetype=obj | llvm-dwarfdump -debug-dump=line - | FileCheck %s
+; RUN: %llc_dwarf < %s -filetype=asm | FileCheck --check-prefix=ASM %s
+
+; If multiple line tables are emitted, one per CU, those line tables can
+; unambiguously rely on the comp_dir of their owning CU and use directory '0'
+; to refer to it.
+
+; CHECK: .debug_line contents:
+; CHECK-NEXT: Line table prologue:
+; CHECK-NOT: include_directories
+; CHECK: file_names[   1]   0 {{.*}} a.cpp
+; CHECK-NOT: file_names
+
+; CHECK: Line table prologue:
+; CHECK-NOT: include_directories
+; CHECK: file_names[   1]   0 {{.*}} b.cpp
+; CHECK-NOT: file_names
+
+; However, if a single line table is emitted and shared between CUs, the
+; comp_dir is ambiguous and relying on it would lead to different path
+; interpretations depending on which CU lead to the table - so ensure that
+; full paths are always emitted in this case, never comp_dir relative.
+
+; ASM: .file   1 "/tmp/dbginfo/a{{[/\\]+}}a.cpp"
+; ASM: .file   2 "/tmp/dbginfo/b{{[/\\]+}}b.cpp"
+
+; Generated from the following source compiled to bitcode from within their
+; respective directories (with debug info) and linked together with llvm-link
+
+; a/a.cpp
+; void func() {
+; }
+
+; b/b.cpp
+; void func();
+; int main() {
+;   func();
+; }
+
+; Function Attrs: nounwind uwtable
+define void @_Z4funcv() #0 !dbg !4 {
+entry:
+  ret void, !dbg !19
+}
+
+; Function Attrs: uwtable
+define i32 @main() #1 !dbg !11 {
+entry:
+  call void @_Z4funcv(), !dbg !20
+  ret i32 0, !dbg !21
+}
+
+attributes #0 = { nounwind uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
+attributes #1 = { uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
+
+!llvm.dbg.cu = !{!0, !8}
+!llvm.module.flags = !{!16, !17}
+!llvm.ident = !{!18, !18}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0 ", isOptimized: false, emissionKind: 1, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
+!1 = !DIFile(filename: "a.cpp", directory: "/tmp/dbginfo/a")
+!2 = !{}
+!3 = !{!4}
+!4 = distinct !DISubprogram(name: "func", linkageName: "_Z4funcv", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 1, file: !1, scope: !5, type: !6, variables: !2)
+!5 = !DIFile(filename: "a.cpp", directory: "/tmp/dbginfo/a")
+!6 = !DISubroutineType(types: !7)
+!7 = !{null}
+!8 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0 ", isOptimized: false, emissionKind: 1, file: !9, enums: !2, retainedTypes: !2, subprograms: !10, globals: !2, imports: !2)
+!9 = !DIFile(filename: "b.cpp", directory: "/tmp/dbginfo/b")
+!10 = !{!11}
+!11 = distinct !DISubprogram(name: "main", line: 2, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 2, file: !9, scope: !12, type: !13, variables: !2)
+!12 = !DIFile(filename: "b.cpp", directory: "/tmp/dbginfo/b")
+!13 = !DISubroutineType(types: !14)
+!14 = !{!15}
+!15 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
+!16 = !{i32 2, !"Dwarf Version", i32 4}
+!17 = !{i32 1, !"Debug Info Version", i32 3}
+!18 = !{!"clang version 3.5.0 "}
+!19 = !DILocation(line: 2, scope: !4)
+!20 = !DILocation(line: 3, scope: !11)
+!21 = !DILocation(line: 4, scope: !11)
+