[ObjectYAML] Support Thin MachO headers to YAML

This patch adds support to ObjectYAML for serializing mach_header structs.

llvm-svn: 269303

1 files changed, 44 insertions, 0 deletions

diff --git a/llvm/lib/ObjectYAML/MachOYAML.cpp b/llvm/lib/ObjectYAML/MachOYAML.cpp
new file mode 100644
index 00000000000..91d9583c98e
--- /dev/null
+++ b/llvm/lib/ObjectYAML/MachOYAML.cpp
@@ -0,0 +1,44 @@
+//===- MachOYAML.cpp - MachO YAMLIO implementation ------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines classes for handling the YAML representation of MachO.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ObjectYAML/MachOYAML.h"
+#include "llvm/Support/Casting.h"
+
+namespace llvm {
+
+namespace yaml {
+
+void MappingTraits<MachOYAML::FileHeader>::mapping(
+    IO &IO, MachOYAML::FileHeader &FileHdr) {
+  IO.mapRequired("cputype", FileHdr.cputype);
+  IO.mapRequired("cpusubtype", FileHdr.cpusubtype);
+  IO.mapOptional("filetype", FileHdr.filetype);
+  IO.mapRequired("ncmds", FileHdr.ncmds);
+  IO.mapRequired("flags", FileHdr.flags);
+}
+
+void MappingTraits<MachOYAML::Object>::mapping(IO &IO,
+                                               MachOYAML::Object &Object) {
+  // If the context isn't already set, tag the document as !mach-o.
+  // For Fat files there will be a different tag so they can be differentiated.
+  if(!IO.getContext()) {
+    IO.setContext(&Object);
+    IO.mapTag("!mach-o", true);
+  }
+  IO.mapRequired("FileHeader", Object.Header);
+  IO.setContext(nullptr);
+}
+
+} // namespace llvm::yaml
+
+} // namespace llvm