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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 PROCEDURE_LINKAGE_TABLE_H
     10 #define PROCEDURE_LINKAGE_TABLE_H
     11 #ifdef ENABLE_UNITTEST
     12 #include <gtest.h>
     13 #endif
     14 
     15 #include <mcld/LD/LDSection.h>
     16 #include <mcld/MC/MCTargetFragment.h>
     17 #include <llvm/ADT/ilist.h>
     18 
     19 namespace mcld
     20 {
     21 
     22 class ResolveInfo;
     23 
     24 /** \class PLTEntry
     25  */
     26 class PLTEntry : public MCTargetFragment
     27 {
     28 public:
     29   PLTEntry(size_t pSize, llvm::MCSectionData* pParent);
     30   virtual ~PLTEntry();
     31 
     32   size_t getEntrySize() const
     33   { return m_EntrySize; }
     34 
     35   void setContent(unsigned char* pContent)
     36   { m_pContent = pContent; }
     37 
     38   const unsigned char* getContent() const
     39   { return m_pContent; }
     40 
     41   //Used by llvm::cast<>.
     42   static bool classof(const MCFragment *O)
     43   { return true; }
     44 
     45   size_t getSize() const
     46   { return m_EntrySize; }
     47 
     48 protected:
     49   size_t m_EntrySize;
     50   unsigned char* m_pContent;
     51 };
     52 
     53 /** \class PLT
     54  *  \brief Procedure linkage table
     55  */
     56 class PLT
     57 {
     58 public:
     59   PLT(LDSection& pSection, llvm::MCSectionData& pSectionData);
     60   virtual ~PLT();
     61 
     62   const LDSection& getSection() const
     63   { return m_Section; }
     64 
     65   const llvm::MCSectionData& getSectionData() const
     66   { return m_SectionData; }
     67 
     68 public:
     69   /// reserveEntry - reseve the number of pNum of empty entries
     70   /// The empty entris are reserved for layout to adjust the fragment offset.
     71   virtual void reserveEntry(size_t pNum = 1) = 0;
     72 
     73   /// getPLTEntry - get an empty entry or an exitsted filled entry with pSymbol.
     74   /// @param pSymbol - the target symbol
     75   /// @param pExist - ture if the a filled entry with pSymbol existed, otherwise false.
     76   virtual PLTEntry* getPLTEntry(const ResolveInfo& pSymbol, bool& pExist) = 0;
     77 
     78 protected:
     79   LDSection& m_Section;
     80   llvm::MCSectionData& m_SectionData;
     81 };
     82 
     83 } // namespace of mcld
     84 
     85 #endif
     86 
     87