[Object][XCOFF] Add an XCOFF dumper for llvm-readobj.

Patch adds support for dumping of file headers with llvm-readobj. XCOFF
object files are added to test dumping a well formed file, and dumping
both negative timestamps and negative symbol counts, both of which are
allowed in the XCOFF definition.

Differential Revision: https://reviews.llvm.org/D60878

llvm-svn: 359878

1 files changed, 34 insertions, 7 deletions

diff --git a/llvm/lib/Object/XCOFFObjectFile.cpp b/llvm/lib/Object/XCOFFObjectFile.cpp
index bc982593f0b..2a456538966 100644
--- a/llvm/lib/Object/XCOFFObjectFile.cpp
+++ b/llvm/lib/Object/XCOFFObjectFile.cpp
@@ -69,10 +69,6 @@ size_t XCOFFObjectFile::getSectionHeaderSize() const {
   return sizeof(XCOFFSectionHeader);
 }
 
-uint16_t XCOFFObjectFile::getNumberOfSections() const {
-  return FileHdrPtr->NumberOfSections;
-}
-
 void XCOFFObjectFile::moveSymbolNext(DataRefImpl &Symb) const {
   llvm_unreachable("Not yet implemented!");
   return;
@@ -247,9 +243,9 @@ section_iterator XCOFFObjectFile::section_end() const {
 }
 
 uint8_t XCOFFObjectFile::getBytesInAddress() const {
-  uint8_t Result = 0;
-  llvm_unreachable("Not yet implemented!");
-  return Result;
+  // Only support 32-bit object files for now ...
+  assert(getFileHeaderSize() ==  XCOFF32FileHeaderSize);
+  return 4;
 }
 
 StringRef XCOFFObjectFile::getFileFormatName() const {
@@ -300,6 +296,37 @@ XCOFFObjectFile::XCOFFObjectFile(MemoryBufferRef Object, std::error_code &EC)
   }
 }
 
+uint16_t XCOFFObjectFile::getMagic() const {
+  return FileHdrPtr->Magic;
+}
+
+uint16_t XCOFFObjectFile::getNumberOfSections() const {
+  return FileHdrPtr->NumberOfSections;
+}
+
+int32_t XCOFFObjectFile::getTimeStamp() const {
+  return FileHdrPtr->TimeStamp;
+}
+
+uint32_t XCOFFObjectFile::getSymbolTableOffset() const {
+  return FileHdrPtr->SymbolTableOffset;
+}
+
+int32_t XCOFFObjectFile::getNumberOfSymbolTableEntries() const {
+  // As far as symbol table size is concerned, if this field is negative it is
+  // to be treated as a 0. However since this field is also used for printing we
+  // don't want to truncate any negative values.
+  return FileHdrPtr->NumberOfSymTableEntries;
+}
+
+uint16_t XCOFFObjectFile::getOptionalHeaderSize() const {
+  return FileHdrPtr->AuxHeaderSize;
+}
+
+uint16_t XCOFFObjectFile::getFlags() const {
+  return FileHdrPtr->Flags;
+}
+
 Expected<std::unique_ptr<ObjectFile>>
 ObjectFile::createXCOFFObjectFile(MemoryBufferRef Object) {
   StringRef Data = Object.getBuffer();