Re-submit r207884: Remove dead code

Differential Revision: http://reviews.llvm.org/D3599

llvm-svn: 207989

lld/include/lld/Core/DefinedAtom.h

@@ -270,12 +270,6 @@ public:
   /// is R__.
   virtual ContentPermissions permissions() const;
 
-  /// \brief means this is a zero size atom that exists to provide an alternate
-  /// name for another atom.  Alias atoms must have a special Reference to the
-  /// atom they alias which the layout engine recognizes and forces the alias
-  /// atom to layout right before the target atom.
-  virtual bool isAlias() const = 0;
-
   /// \brief returns a reference to the raw (unrelocated) bytes of this Atom's
   /// content.
   virtual ArrayRef<uint8_t> rawContent() const = 0;

lld/include/lld/ReaderWriter/Simple.h

@@ -140,8 +140,6 @@ public:
     return DefinedAtom::deadStripNormal;
   }
 
-  bool isAlias() const override { return false; }
-
   DefinedAtom::reference_iterator begin() const override {
     uintptr_t index = 0;
     const void *it = reinterpret_cast<const void *>(index);

lld/lib/ReaderWriter/CoreLinkingContext.cpp

@@ -63,8 +63,6 @@ public:
     return DefinedAtom::permR_X;
   }
 
-  bool isAlias() const override { return false; }
-
   ArrayRef<uint8_t> rawContent() const override { return ArrayRef<uint8_t>(); }
 
   reference_iterator begin() const override {
@@ -128,8 +126,6 @@ public:
     return DefinedAtom::permRW_;
   }
 
-  bool isAlias() const override { return false; }
-
   ArrayRef<uint8_t> rawContent() const override { return ArrayRef<uint8_t>(); }
 
   reference_iterator begin() const override {
@@ -273,4 +269,3 @@ void CoreLinkingContext::addPasses(PassManager &pm) {
 }
 
 Writer &CoreLinkingContext::writer() const { return *_writer; }
-

lld/lib/ReaderWriter/ELF/Atoms.h

@@ -381,9 +381,6 @@ public:
     }
   }
 
-  // FIXME: Not Sure if ELF supports alias atoms. Find out more.
-  bool isAlias() const override { return false; }
-
   ArrayRef<uint8_t> rawContent() const override { return _contentData; }
 
   DefinedAtom::reference_iterator begin() const override {
@@ -487,8 +484,6 @@ public:
 
   virtual bool isThumb() const { return false; }
 
-  bool isAlias() const override { return false; }
-
   ArrayRef<uint8_t> rawContent() const override { return _contentData; }
 
   DefinedAtom::reference_iterator begin() const override {
@@ -571,8 +566,6 @@ public:
 
   ContentPermissions permissions() const override { return permRW_; }
 
-  bool isAlias() const override { return false; }
-
   ArrayRef<uint8_t> rawContent() const override { return ArrayRef<uint8_t>(); }
 
   DefinedAtom::reference_iterator begin() const override {

lld/lib/ReaderWriter/Native/ReaderNative.cpp

@@ -98,10 +98,6 @@ public:
      return (DefinedAtom::ContentPermissions)(attributes().permissions);
   }
 
-  bool isAlias() const override {
-     return (attributes().alias != 0);
-  }
-
   ArrayRef<uint8_t> rawContent() const override;
 
   reference_iterator begin() const override;

lld/lib/ReaderWriter/Native/WriterNative.cpp

@@ -431,7 +431,6 @@ private:
     attrs.deadStrip         = atom.deadStrip();
     attrs.dynamicExport     = atom.dynamicExport();
     attrs.permissions       = atom.permissions();
-    attrs.alias             = atom.isAlias();
     return attrs;
   }
 

lld/lib/ReaderWriter/PECOFF/Atoms.h

@@ -105,7 +105,6 @@ public:
     return sectionPositionAny;
   }
   DeadStripKind deadStrip() const override { return deadStripNormal; }
-  bool isAlias() const override { return false; }
 
   Kind getKind() const { return _kind; }
 

lld/lib/ReaderWriter/YAML/ReaderWriterYAML.cpp

@@ -892,7 +892,6 @@ template <> struct MappingTraits<const lld::DefinedAtom *> {
     DeadStripKind deadStrip() const override { return _deadStrip; }
     DynamicExport dynamicExport() const override { return _dynamicExport; }
     ContentPermissions permissions() const override { return _permissions; }
-    bool isAlias() const override { return false; }
     bool isGroupChild() const { return _isGroupChild; }
     ArrayRef<uint8_t> rawContent() const override {
       if (!occupiesDiskSpace())