[llvm-objcopy] [COFF] Remove pointless Reader/Writer base classes. NFC.

These were copied as part of the original design from the ELF
backend, but aren't necessary at the moment.

Differential Revision: https://reviews.llvm.org/D56431

llvm-svn: 350996

llvm/tools/llvm-objcopy/COFF/Reader.cpp

@@ -23,8 +23,6 @@ namespace coff {
 
 using namespace object;
 
-Reader::~Reader() {}
-
 Error COFFReader::readExecutableHeaders(Object &Obj) const {
   const dos_header *DH = COFFObj.getDOSHeader();
   Obj.Is64 = COFFObj.is64();

llvm/tools/llvm-objcopy/COFF/Reader.h

@@ -23,13 +23,7 @@ struct Object;
 
 using object::COFFObjectFile;
 
-class Reader {
-public:
-  virtual ~Reader();
-  virtual Expected<std::unique_ptr<Object>> create() const = 0;
-};
-
-class COFFReader : public Reader {
+class COFFReader {
   const COFFObjectFile &COFFObj;
 
   Error readExecutableHeaders(Object &Obj) const;
@@ -39,7 +33,7 @@ class COFFReader : public Reader {
 
 public:
   explicit COFFReader(const COFFObjectFile &O) : COFFObj(O) {}
-  Expected<std::unique_ptr<Object>> create() const override;
+  Expected<std::unique_ptr<Object>> create() const;
 };
 
 } // end namespace coff

llvm/tools/llvm-objcopy/COFF/Writer.cpp

@@ -25,8 +25,6 @@ namespace coff {
 using namespace object;
 using namespace COFF;
 
-Writer::~Writer() {}
-
 Error COFFWriter::finalizeRelocTargets() {
   for (Section &Sec : Obj.Sections) {
     for (Relocation &R : Sec.Relocs) {

llvm/tools/llvm-objcopy/COFF/Writer.h

@@ -22,19 +22,10 @@ namespace coff {
 
 struct Object;
 
-class Writer {
-protected:
+class COFFWriter {
   Object &Obj;
   Buffer &Buf;
 
-public:
-  virtual ~Writer();
-  virtual Error write() = 0;
-
-  Writer(Object &O, Buffer &B) : Obj(O), Buf(B) {}
-};
-
-class COFFWriter : public Writer {
   size_t FileSize;
   size_t FileAlignment;
   size_t SizeOfInitializedData;
@@ -57,10 +48,10 @@ class COFFWriter : public Writer {
 
 public:
   virtual ~COFFWriter() {}
-  Error write() override;
+  Error write();
 
   COFFWriter(Object &Obj, Buffer &Buf)
-      : Writer(Obj, Buf), StrTabBuilder(StringTableBuilder::WinCOFF) {}
+      : Obj(Obj), Buf(Buf), StrTabBuilder(StringTableBuilder::WinCOFF) {}
 };
 
 } // end namespace coff