[macho2yaml] Don't write empty linkedit data

Since I stopped writing empty export tries it causes LinkEdit to potentially be completely empty which results in invalid yaml being generated.

To prevent this we skip linkedit data if it is empty.

llvm-svn: 278985

1 files changed, 6 insertions, 1 deletions

diff --git a/llvm/lib/ObjectYAML/MachOYAML.cpp b/llvm/lib/ObjectYAML/MachOYAML.cpp
index 5825d0042eb..984ca0b9d01 100644
--- a/llvm/lib/ObjectYAML/MachOYAML.cpp
+++ b/llvm/lib/ObjectYAML/MachOYAML.cpp
@@ -22,6 +22,10 @@ namespace llvm {
 
 MachOYAML::LoadCommand::~LoadCommand() {}
 
+bool MachOYAML::LinkEditData::isEmpty() const {
+  return 0 == RebaseOpcodes.size() + BindOpcodes.size() + WeakBindOpcodes.size() + LazyBindOpcodes.size() + ExportTrie.Children.size() + NameList.size() + StringTable.size();
+}
+
 namespace yaml {
 
 void ScalarTraits<char_16>::output(const char_16 &Val, void *,
@@ -95,7 +99,8 @@ void MappingTraits<MachOYAML::Object>::mapping(IO &IO,
   IO.mapTag("!mach-o", true);
   IO.mapRequired("FileHeader", Object.Header);
   IO.mapOptional("LoadCommands", Object.LoadCommands);
-  IO.mapOptional("LinkEditData", Object.LinkEdit);
+  if(!Object.LinkEdit.isEmpty() || !IO.outputting())
+    IO.mapOptional("LinkEditData", Object.LinkEdit);
 
   if (IO.getContext() == &Object)
     IO.setContext(nullptr);