1 files changed, 26 insertions, 0 deletions
diff --git a/llvm/lib/Support/StringSaver.cpp b/llvm/lib/Support/StringSaver.cpp
new file mode 100644
index 000000000000..f7ccfb97ea79
--- /dev/null
+++ b/llvm/lib/Support/StringSaver.cpp
@@ -0,0 +1,26 @@
+//===-- StringSaver.cpp ---------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/StringSaver.h"
+
+using namespace llvm;
+
+StringRef StringSaver::save(StringRef S) {
+  char *P = Alloc.Allocate<char>(S.size() + 1);
+  if (!S.empty())
+    memcpy(P, S.data(), S.size());
+  P[S.size()] = '\0';
+  return StringRef(P, S.size());
+}
+
+StringRef UniqueStringSaver::save(StringRef S) {
+  auto R = Unique.insert(S);
+  if (R.second)                 // cache miss, need to actually save the string
+    *R.first = Strings.save(S); // safe replacement with equal value
+  return *R.first;
+}