1 files changed, 84 insertions, 0 deletions
diff --git a/lld/lib/Platforms/Darwin/ExecutableAtoms.hpp b/lld/lib/Platforms/Darwin/ExecutableAtoms.hpp
new file mode 100644
index 00000000000..31bd181ccb3
--- /dev/null
+++ b/lld/lib/Platforms/Darwin/ExecutableAtoms.hpp
@@ -0,0 +1,84 @@
+//===- Platforms/Darwin/x86_64StubAtom.hpp --------------------------------===//
+//
+//                             The LLVM Linker
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLD_PLATFORM_DARWIN_EXECUTABLE_ATOM_H_
+#define LLD_PLATFORM_DARWIN_EXECUTABLE_ATOM_H_
+
+
+#include "lld/Core/DefinedAtom.h"
+#include "lld/Core/UndefinedAtom.h"
+#include "lld/Core/File.h"
+#include "lld/Core/Reference.h"
+
+#include "DarwinReferenceKinds.h"
+#include "SimpleAtoms.hpp"
+
+namespace lld {
+namespace darwin {
+
+
+//
+// EntryPointReferenceAtom is used to:
+//  1) Require "_main" is defined.
+//  2) Give Darwin Platform a pointer to the atom named "_main"
+//
+class EntryPointReferenceAtom : public SimpleDefinedAtom {
+public:
+        EntryPointReferenceAtom(const File &file) 
+                       : SimpleDefinedAtom(file)
+                       , _mainUndefAtom(file, "_main") {
+          this->addReference(ReferenceKind::none, 0, &_mainUndefAtom, 0);
+        }
+
+  virtual ContentType contentType() const  {
+    return DefinedAtom::typeCode;
+  }
+
+  virtual uint64_t size() const {
+    return 0;
+  }
+
+  virtual ContentPermissions permissions() const  {
+    return DefinedAtom::permR_X;
+  }
+  
+  virtual ArrayRef<uint8_t> rawContent() const {
+    return ArrayRef<uint8_t>();
+  }
+private:
+  friend class CRuntimeFile;
+  SimpleUndefinedAtom   _mainUndefAtom;
+};
+
+
+class CRuntimeFile : public SimpleFile {
+public:
+    CRuntimeFile() 
+          : SimpleFile("C runtime")
+          , _atom(*this) {
+      this->addAtom(_atom);
+      this->addAtom(_atom._mainUndefAtom);
+   }
+    
+    const Atom *mainAtom() {
+      const Reference *ref = *(_atom.begin());
+      return ref->target();
+    }
+    
+private:
+  EntryPointReferenceAtom   _atom;
+};
+
+
+
+} // namespace darwin 
+} // namespace lld 
+
+
+#endif // LLD_PLATFORM_DARWIN_EXECUTABLE_ATOM_H_