From 8c22b666fc754a3216809fe10e13e9356848b55c Mon Sep 17 00:00:00 2001
From: Chris Bieneman <beanz@apple.com>
Date: Thu, 12 May 2016 16:04:16 +0000
Subject: [PATCH] [ObjectYAML] Support Thin MachO headers to YAML

This patch adds support to ObjectYAML for serializing mach_header structs.

llvm-svn: 269303
---
 include/llvm/ObjectYAML/MachOYAML.h | 53 +++++++++++++++++++++++++++++
 lib/ObjectYAML/CMakeLists.txt       |  1 +
 lib/ObjectYAML/MachOYAML.cpp        | 44 ++++++++++++++++++++++++
 3 files changed, 98 insertions(+)
 create mode 100644 include/llvm/ObjectYAML/MachOYAML.h
 create mode 100644 lib/ObjectYAML/MachOYAML.cpp

diff --git a/include/llvm/ObjectYAML/MachOYAML.h b/include/llvm/ObjectYAML/MachOYAML.h
new file mode 100644
index 00000000000..bf1d274b885
--- /dev/null
+++ b/include/llvm/ObjectYAML/MachOYAML.h
@@ -0,0 +1,53 @@
+//===- MachOYAML.h - Mach-O YAMLIO implementation ---------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// \brief This file declares classes for handling the YAML representation
+/// of Mach-O.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_OBJECTYAML_MACHOYAML_H
+#define LLVM_OBJECTYAML_MACHOYAML_H
+
+#include "llvm/ObjectYAML/YAML.h"
+#include "llvm/Support/MachO.h"
+
+namespace llvm {
+namespace MachOYAML {
+
+struct FileHeader {
+  llvm::yaml::Hex32 cputype;
+  llvm::yaml::Hex32 cpusubtype;
+  llvm::yaml::Hex32 filetype;
+  uint32_t ncmds;
+  llvm::yaml::Hex32 flags;
+};
+
+struct Object {
+  FileHeader Header;
+};
+
+} // namespace llvm::MachOYAML
+
+namespace yaml {
+
+template <> struct MappingTraits<MachOYAML::FileHeader> {
+  static void mapping(IO &IO, MachOYAML::FileHeader &FileHeader);
+};
+
+template <> struct MappingTraits<MachOYAML::Object> {
+  static void mapping(IO &IO, MachOYAML::Object &Object);
+};
+
+} // namespace llvm::yaml
+
+} // namespace llvm
+
+#endif
diff --git a/lib/ObjectYAML/CMakeLists.txt b/lib/ObjectYAML/CMakeLists.txt
index 9ebe1e30ad0..7e1363d8dac 100644
--- a/lib/ObjectYAML/CMakeLists.txt
+++ b/lib/ObjectYAML/CMakeLists.txt
@@ -2,4 +2,5 @@ add_llvm_library(LLVMObjectYAML
   YAML.cpp
   COFFYAML.cpp
   ELFYAML.cpp
+  MachOYAML.cpp
   )
diff --git a/lib/ObjectYAML/MachOYAML.cpp b/lib/ObjectYAML/MachOYAML.cpp
new file mode 100644
index 00000000000..91d9583c98e
--- /dev/null
+++ b/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