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      1 //===- PLT.h --------------------------------------------------------------===//
      2 //
      3 //                     The MCLinker Project
      4 //
      5 // This file is distributed under the University of Illinois Open Source
      6 // License. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 #ifndef MCLD_TARGET_PLT_H
     10 #define MCLD_TARGET_PLT_H
     11 
     12 #include <mcld/LD/LDSection.h>
     13 #include <mcld/LD/SectionData.h>
     14 #include <mcld/Fragment/TargetFragment.h>
     15 
     16 namespace mcld {
     17 
     18 class LDSection;
     19 class ResolveInfo;
     20 
     21 /** \class PLTEntryDefaultBase
     22  *  \brief PLTEntryDefaultBase provides the default interface for PLT Entry
     23  */
     24 class PLTEntryBase : public TargetFragment
     25 {
     26 public:
     27   PLTEntryBase(SectionData& pParent)
     28     : TargetFragment(Fragment::Target, &pParent), m_pValue(NULL)
     29   {}
     30 
     31   virtual ~PLTEntryBase()
     32   {
     33     free(m_pValue);
     34   }
     35 
     36   void setValue(unsigned char* pValue)
     37   { m_pValue = pValue; }
     38 
     39   const unsigned char* getValue() const
     40   { return m_pValue; }
     41 
     42   //Used by llvm::cast<>.
     43   static bool classof(const Fragment *O)
     44   { return true; }
     45 
     46 protected:
     47   unsigned char* m_pValue;
     48 };
     49 
     50 /** \class PLT
     51  *  \brief Procedure linkage table
     52  */
     53 class PLT
     54 {
     55 public:
     56   typedef SectionData::iterator iterator;
     57   typedef SectionData::const_iterator const_iterator;
     58 
     59   template<size_t SIZE, typename EntryBase = PLTEntryBase>
     60   class Entry : public EntryBase
     61   {
     62   public:
     63     enum { EntrySize = SIZE };
     64 
     65   public:
     66     Entry(SectionData& pParent)
     67       : EntryBase(pParent)
     68     {}
     69 
     70     virtual ~Entry() {}
     71 
     72     size_t size() const
     73     { return EntrySize; }
     74   };
     75 
     76 public:
     77   PLT(LDSection& pSection);
     78 
     79   virtual ~PLT();
     80 
     81   // finalizeSectionSize - set LDSection size
     82   virtual void finalizeSectionSize() = 0;
     83 
     84   uint64_t addr() const { return m_Section.addr(); }
     85 
     86   const_iterator begin() const { return m_pSectionData->begin(); }
     87   iterator       begin()       { return m_pSectionData->begin(); }
     88   const_iterator end  () const { return m_pSectionData->end();   }
     89   iterator       end  ()       { return m_pSectionData->end();   }
     90 
     91 protected:
     92   LDSection& m_Section;
     93   SectionData* m_pSectionData;
     94 };
     95 
     96 } // namespace of mcld
     97 
     98 #endif
     99 
    100