[mach-o] Add support for interposing tuples section

Darwin uses two-level-namespace lookup for symbols which means the static
linker records where each symbol must be found at runtime.  Thus defining a
symbol in a dylib loaded earlier will not effect where symbols needed by
later dylibs will be found.  Instead overriding is done through a section
of type S_INTERPOSING which contains tuples of <interposer, interposee>.

llvm-svn: 221421

1 files changed, 2 insertions, 0 deletions

diff --git a/lld/lib/ReaderWriter/YAML/ReaderWriterYAML.cpp b/lld/lib/ReaderWriter/YAML/ReaderWriterYAML.cpp
index 31fd4dbd235..72537b94cd3 100644
--- a/lld/lib/ReaderWriter/YAML/ReaderWriterYAML.cpp
+++ b/lld/lib/ReaderWriter/YAML/ReaderWriterYAML.cpp
@@ -437,6 +437,8 @@ template <> struct ScalarEnumerationTraits<lld::DefinedAtom::ContentType> {
                                           DefinedAtom::typeObjC2CategoryList);
     io.enumCase(value, "objc-class1",     DefinedAtom::typeObjC1Class);
     io.enumCase(value, "dtraceDOF",       DefinedAtom::typeDTraceDOF);
+    io.enumCase(value, "interposing-tuples",
+                                          DefinedAtom::typeInterposingTuples);
     io.enumCase(value, "lto-temp",        DefinedAtom::typeTempLTO);
     io.enumCase(value, "compact-unwind",  DefinedAtom::typeCompactUnwindInfo);
     io.enumCase(value, "unwind-info",     DefinedAtom::typeProcessedUnwindInfo);