From e161ced16aff690f990be0729019c7aa2cd55eb6 Mon Sep 17 00:00:00 2001
From: Mehdi Amini <joker.eph@gmail.com>
Date: Mon, 29 May 2017 05:17:57 +0000
Subject: [PATCH] Revert "DebugInfo: Omit an empty CU when a subprogram was
 moved into its use"

This reverts commit r304111.
GreenDragon is broken.

llvm-svn: 304126
---
 llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp    | 20 +++++------
 llvm/test/DebugInfo/split-dwarf-omit-empty.ll | 52 ---------------------------
 2 files changed, 8 insertions(+), 64 deletions(-)
 delete mode 100644 llvm/test/DebugInfo/split-dwarf-omit-empty.ll

diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index 06358c4..b6cd82a 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -374,18 +374,14 @@ void DwarfDebug::constructAbstractSubprogramScopeDIE(DwarfCompileUnit &SrcCU,
 
   // Find the subprogram's DwarfCompileUnit in the SPMap in case the subprogram
   // was inlined from another compile unit.
-  if (useSplitDwarf() && !shareAcrossDWOCUs() && !SP->getUnit()->getSplitDebugInlining())
-    // Avoid building the original CU if it won't be used
-    SrcCU.constructAbstractSubprogramScopeDIE(Scope);
-  else {
-    auto &CU = getOrCreateDwarfCompileUnit(SP->getUnit());
-    if (auto *SkelCU = CU.getSkeleton()) {
-      (shareAcrossDWOCUs() ? CU : SrcCU)
-          .constructAbstractSubprogramScopeDIE(Scope);
-      if (CU.getCUNode()->getSplitDebugInlining())
-        SkelCU->constructAbstractSubprogramScopeDIE(Scope);
-    } else
-      CU.constructAbstractSubprogramScopeDIE(Scope);
+  auto &CU = getOrCreateDwarfCompileUnit(SP->getUnit());
+  if (auto *SkelCU = CU.getSkeleton()) {
+    (shareAcrossDWOCUs() ? CU : SrcCU)
+        .constructAbstractSubprogramScopeDIE(Scope);
+    if (CU.getCUNode()->getSplitDebugInlining())
+      SkelCU->constructAbstractSubprogramScopeDIE(Scope);
+  } else {
+    CU.constructAbstractSubprogramScopeDIE(Scope);
   }
 }
 
diff --git a/llvm/test/DebugInfo/split-dwarf-omit-empty.ll b/llvm/test/DebugInfo/split-dwarf-omit-empty.ll
deleted file mode 100644
index 09119f6..0000000
--- a/llvm/test/DebugInfo/split-dwarf-omit-empty.ll
+++ /dev/null
@@ -1,52 +0,0 @@
-; RUN: %llc_dwarf -split-dwarf-file=foo.dwo  %s -filetype=obj -o - | llvm-dwarfdump -debug-dump=info - | FileCheck %s
-
-; Created from:
-; a.cpp:
-;   void f1();
-;   inline __attribute__((always_inline)) __attribute__((used)) void f2() { f1(); }
-; b.cpp:
-;   void f2();
-;   void f3() {
-;     f2();
-;   }
-; $ clang++ -fno-split-dwarf-inlining {a,b}.cpp -emit-llvm -S -g
-; $ llvm-link {a,b}.ll -S -o ab.ll
-; Then strip out the @llvm.used global, so no out of line definition of 'f2'
-; will be emitted. This emulates something more like the available_externally
-; import performed by ThinLTO.
-
-; CHECK: Compile Unit
-; CHECK-NOT: Compile Unit
-
-declare void @_Z2f1v()
-
-; Function Attrs: noinline norecurse uwtable
-define i32 @main() !dbg !9 {
-entry:
-  call void @_Z2f1v(), !dbg !13
-  ret i32 0, !dbg !18
-}
-
-!llvm.dbg.cu = !{!0, !3}
-!llvm.ident = !{!5, !5}
-!llvm.module.flags = !{!6, !7, !8}
-
-!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 5.0.0 (trunk 304054) (llvm/trunk 304080)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false)
-!1 = !DIFile(filename: "a.cpp", directory: "/usr/local/google/home/blaikie/dev/scratch")
-!2 = !{}
-!3 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !4, producer: "clang version 5.0.0 (trunk 304054) (llvm/trunk 304080)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false)
-!4 = !DIFile(filename: "b.cpp", directory: "/usr/local/google/home/blaikie/dev/scratch")
-!5 = !{!"clang version 5.0.0 (trunk 304054) (llvm/trunk 304080)"}
-!6 = !{i32 2, !"Dwarf Version", i32 4}
-!7 = !{i32 2, !"Debug Info Version", i32 3}
-!8 = !{i32 1, !"wchar_size", i32 4}
-!9 = distinct !DISubprogram(name: "main", scope: !4, file: !4, line: 2, type: !10, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: false, unit: !3, variables: !2)
-!10 = !DISubroutineType(types: !11)
-!11 = !{!12}
-!12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
-!13 = !DILocation(line: 2, column: 73, scope: !14, inlinedAt: !17)
-!14 = distinct !DISubprogram(name: "f2", linkageName: "_Z2f2v", scope: !1, file: !1, line: 2, type: !15, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
-!15 = !DISubroutineType(types: !16)
-!16 = !{null}
-!17 = distinct !DILocation(line: 3, column: 3, scope: !9)
-!18 = !DILocation(line: 4, column: 1, scope: !9)
-- 
2.7.4