DwarfDebug: Emit dwo_id+dwo_name for DICompileUnits that provide a dwoId.

For module debugging clang emits prefabricated skeleton compile units
that can be recognized by a nonzero dwoId.

llvm-svn: 247626

1 files changed, 8 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index 4a673d49ced..31d73a9035f 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -459,6 +459,14 @@ DwarfDebug::constructDwarfCompileUnit(const DICompileUnit *DIUnit) {
   else
     NewCU.initSection(Asm->getObjFileLowering().getDwarfInfoSection());
 
+  // Module debugging: This is a prefabricated skeleton CU.
+  if (DIUnit->getDWOId()) {
+    NewCU.addUInt(Die, dwarf::DW_AT_GNU_dwo_id, dwarf::DW_FORM_data8,
+                  DIUnit->getDWOId());
+    NewCU.addString(Die, dwarf::DW_AT_GNU_dwo_name,
+                    DIUnit->getSplitDebugFilename());
+  }
+
   CUMap.insert(std::make_pair(DIUnit, &NewCU));
   CUDieMap.insert(std::make_pair(&Die, &NewCU));
   return NewCU;