[MachO] Begin to add some MachO specific File/Atoms, and add the start of

normalizedToAtoms.

llvm-svn: 198459

1 files changed, 66 insertions, 0 deletions

diff --git a/lld/lib/ReaderWriter/MachO/MachONormalizedFileToAtoms.cpp b/lld/lib/ReaderWriter/MachO/MachONormalizedFileToAtoms.cpp
new file mode 100644
index 00000000000..2032e0cea05
--- /dev/null
+++ b/lld/lib/ReaderWriter/MachO/MachONormalizedFileToAtoms.cpp
@@ -0,0 +1,66 @@
+//===- lib/ReaderWriter/MachO/MachONormalizedFileToAtoms.cpp --------------===//
+//
+//                             The LLVM Linker
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+///
+/// \file Converts from in-memory normalized mach-o to in-memory Atoms.
+///
+///                  +------------+
+///                  | normalized |
+///                  +------------+
+///                        |
+///                        |
+///                        v
+///                    +-------+
+///                    | Atoms |
+///                    +-------+
+
+#include "MachONormalizedFile.h"
+#include "File.h"
+#include "Atoms.h"
+
+#include "lld/Core/LLVM.h"
+
+#include "llvm/Support/MachO.h"
+
+using namespace llvm::MachO;
+
+namespace lld {
+namespace mach_o {
+namespace normalized {
+
+static ErrorOr<std::unique_ptr<lld::File>>
+normalizedObjectToAtoms(const NormalizedFile &normalizedFile, StringRef path) {
+  std::unique_ptr<MachOFile> file(new MachOFile(path));
+
+  for (auto &sym : normalizedFile.globalSymbols) {
+    file->addDefinedAtom(sym.name,
+                         normalizedFile.sections[sym.sect - 1].content);
+  }
+
+  assert(normalizedFile.localSymbols.empty() &&
+         "local symbols not supported yet!");
+  assert(normalizedFile.undefinedSymbols.empty() &&
+         "undefined symbols not supported yet!");
+
+  return std::unique_ptr<File>(std::move(file));
+}
+
+ErrorOr<std::unique_ptr<lld::File>>
+normalizedToAtoms(const NormalizedFile &normalizedFile, StringRef path) {
+  switch (normalizedFile.fileType) {
+  case MH_OBJECT:
+    return normalizedObjectToAtoms(normalizedFile, path);
+  default:
+    llvm_unreachable("unhandled MachO file type!");
+  }
+}
+
+} // namespace normalized
+} // namespace mach_o
+} // namespace lld