--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lld/lib/Core/DefinedAtom.cpp	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,81 @@
+//===- DefinedAtom.cpp ------------------------------------------*- C++ -*-===//
+//
+// 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/ErrorHandling.h"
+#include "lld/Core/DefinedAtom.h"
+#include "lld/Core/File.h"
+
+namespace lld {
+
+DefinedAtom::ContentPermissions DefinedAtom::permissions() const {
+  // By default base permissions on content type.
+  return permissions(this->contentType());
+}
+
+// Utility function for deriving permissions from content type
+DefinedAtom::ContentPermissions DefinedAtom::permissions(ContentType type) {
+  switch (type) {
+  case typeCode:
+  case typeResolver:
+  case typeBranchIsland:
+  case typeBranchShim:
+  case typeStub:
+  case typeStubHelper:
+  case typeMachHeader:
+    return permR_X;
+
+  case typeConstant:
+  case typeCString:
+  case typeUTF16String:
+  case typeCFI:
+  case typeLSDA:
+  case typeLiteral4:
+  case typeLiteral8:
+  case typeLiteral16:
+  case typeDTraceDOF:
+  case typeCompactUnwindInfo:
+  case typeProcessedUnwindInfo:
+  case typeObjCImageInfo:
+  case typeObjCMethodList:
+    return permR__;
+
+  case typeData:
+  case typeDataFast:
+  case typeZeroFill:
+  case typeZeroFillFast:
+  case typeObjC1Class:
+  case typeLazyPointer:
+  case typeLazyDylibPointer:
+  case typeNonLazyPointer:
+  case typeThunkTLV:
+    return permRW_;
+
+  case typeGOT:
+  case typeConstData:
+  case typeCFString:
+  case typeInitializerPtr:
+  case typeTerminatorPtr:
+  case typeCStringPtr:
+  case typeObjCClassPtr:
+  case typeObjC2CategoryList:
+  case typeInterposingTuples:
+  case typeTLVInitialData:
+  case typeTLVInitialZeroFill:
+  case typeTLVInitializerPtr:
+    return permRW_L;
+
+  case typeUnknown:
+  case typeTempLTO:
+  case typeSectCreate:
+  case typeDSOHandle:
+    return permUnknown;
+  }
+  llvm_unreachable("unknown content type");
+}
+
+} // namespace