vendor/llvm/llvm-trunk-r366426

1 files changed, 13 insertions, 4 deletions

diff --git a/lib/CodeGen/AsmPrinter/DwarfFile.cpp b/lib/CodeGen/AsmPrinter/DwarfFile.cpp
index 78ccad481411..e3c9095d1343 100644
--- a/lib/CodeGen/AsmPrinter/DwarfFile.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfFile.cpp
@@ -1,9 +1,8 @@
 //===- llvm/CodeGen/DwarfFile.cpp - Dwarf Debug Framework -----------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -44,6 +43,11 @@ void DwarfFile::emitUnit(DwarfUnit *TheU, bool UseOffsets) {
   if (!S)
     return;
 
+  // Skip CUs that ended up not being needed (split CUs that were abandoned
+  // because they added no information beyond the non-split CU)
+  if (llvm::empty(TheU->getUnitDie().values()))
+    return;
+
   Asm->OutStreamer->SwitchSection(S);
   TheU->emitHeader(UseOffsets);
   Asm->emitDwarfDIE(TheU->getUnitDie());
@@ -63,6 +67,11 @@ void DwarfFile::computeSizeAndOffsets() {
     if (TheU->getCUNode()->isDebugDirectivesOnly())
       continue;
 
+    // Skip CUs that ended up not being needed (split CUs that were abandoned
+    // because they added no information beyond the non-split CU)
+    if (llvm::empty(TheU->getUnitDie().values()))
+      return;
+
     TheU->setDebugSectionOffset(SecOffset);
     SecOffset += computeSizeAndOffsetsForUnit(TheU.get());
   }