[XCOFF] Add functionality for parsing AIX XCOFF object file headers

Summary:
1. Add functionality for parsing AIX XCOFF object files headers.
2. Only support 32-bit AIX XCOFF object files in this patch.
3. Print out the AIX XCOFF object file header in YAML format.

Reviewers: sfertile, hubert.reinterpretcast, jasonliu, mstorsjo, zturner, rnk

Reviewed By: sfertile, hubert.reinterpretcast

Subscribers: jsji, mgorny, hiraditya, jdoerfert, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D59419

Patch by Digger Lin

llvm-svn: 357663

2 files changed, 43 insertions, 0 deletions

diff --git a/llvm/lib/ObjectYAML/CMakeLists.txt b/llvm/lib/ObjectYAML/CMakeLists.txt
index d2f9723c7d8..8943aab0ec7 100644
--- a/llvm/lib/ObjectYAML/CMakeLists.txt
+++ b/llvm/lib/ObjectYAML/CMakeLists.txt
@@ -12,5 +12,6 @@ add_llvm_library(LLVMObjectYAML
   ObjectYAML.cpp
   MinidumpYAML.cpp
   WasmYAML.cpp
+  XCOFFYAML.cpp
   YAML.cpp
   )
diff --git a/llvm/lib/ObjectYAML/XCOFFYAML.cpp b/llvm/lib/ObjectYAML/XCOFFYAML.cpp
new file mode 100644
index 00000000000..c3fe1bb868c
--- /dev/null
+++ b/llvm/lib/ObjectYAML/XCOFFYAML.cpp
@@ -0,0 +1,42 @@
+//===-- XCOFFYAML.cpp - XCOFF YAMLIO implementation -------------*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines classes for handling the YAML representation of XCOFF.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ObjectYAML/XCOFFYAML.h"
+#include <string.h>
+
+namespace llvm {
+namespace XCOFFYAML {
+
+Object::Object() { memset(&Header, 0, sizeof(Header)); }
+
+} // namespace XCOFFYAML
+
+namespace yaml {
+
+void MappingTraits<XCOFFYAML::FileHeader>::mapping(
+    IO &IO, XCOFFYAML::FileHeader &FileHdr) {
+  IO.mapRequired("MagicNumber", FileHdr.Magic);
+  IO.mapRequired("NumberOfSections", FileHdr.NumberOfSections);
+  IO.mapRequired("CreationTime", FileHdr.TimeStamp);
+  IO.mapRequired("OffsetToSymbolTable", FileHdr.SymbolTableOffset);
+  IO.mapRequired("EntriesInSymbolTable", FileHdr.NumberOfSymTableEntries);
+  IO.mapRequired("AuxiliaryHeaderSize", FileHdr.AuxHeaderSize);
+  IO.mapRequired("Flags", FileHdr.Flags);
+}
+
+void MappingTraits<XCOFFYAML::Object>::mapping(IO &IO, XCOFFYAML::Object &Obj) {
+  IO.mapTag("!XCOFF", true);
+  IO.mapRequired("FileHeader", Obj.Header);
+}
+
+} // namespace yaml
+} // namespace llvm