[PCH] When serializing Stmts, keep track of when sub statements are referenced again and
in such a case just write out a reference of a previously serialized Stmt, instead
of serializing it all over again.
This saves memory + space + [de]serializing time, and avoids blowing up memory
with pathological cases. rdar://10293911
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@142696 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/clang/Serialization/ASTBitCodes.h b/include/clang/Serialization/ASTBitCodes.h
index e7f1265..49f1ddf 100644
--- a/include/clang/Serialization/ASTBitCodes.h
+++ b/include/clang/Serialization/ASTBitCodes.h
@@ -875,6 +875,8 @@
STMT_STOP = 100,
/// \brief A NULL expression.
STMT_NULL_PTR,
+ /// \brief A reference to a previously [de]serialized Stmt record.
+ STMT_REF_PTR,
/// \brief A NullStmt record.
STMT_NULL,
/// \brief A CompoundStmt record.