1 files changed, 13 insertions, 0 deletions
diff --git a/lib/Lex/PPDirectives.cpp b/lib/Lex/PPDirectives.cpp
index e19eb31335..163dbf413e 100644
--- a/lib/Lex/PPDirectives.cpp
+++ b/lib/Lex/PPDirectives.cpp
@@ -57,6 +57,19 @@ MacroInfo *Preprocessor::AllocateMacroInfo(SourceLocation L) {
   return MI;
 }
 
+MacroInfo *Preprocessor::AllocateDeserializedMacroInfo(SourceLocation L,
+                                                       unsigned SubModuleID) {
+  LLVM_STATIC_ASSERT(llvm::AlignOf<MacroInfo>::Alignment >= sizeof(SubModuleID),
+                     "alignment for MacroInfo is less than the ID");
+  MacroInfo *MI =
+      (MacroInfo*)BP.Allocate(sizeof(MacroInfo) + sizeof(SubModuleID),
+                              llvm::AlignOf<MacroInfo>::Alignment);
+  new (MI) MacroInfo(L);
+  MI->FromASTFile = true;
+  MI->setOwningModuleID(SubModuleID);
+  return MI;
+}
+
 MacroDirective *Preprocessor::AllocateMacroDirective(MacroInfo *MI,
                                                      SourceLocation Loc,
                                                      bool isImported) {