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      1 //===- SectionSymbolSet.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_LD_SECTIONSYMBOLSET_H_
     10 #define MCLD_LD_SECTIONSYMBOLSET_H_
     11 
     12 #include "mcld/ADT/HashTable.h"
     13 #include "mcld/ADT/HashEntry.h"
     14 #include "mcld/MC/SymbolCategory.h"
     15 
     16 namespace mcld {
     17 
     18 class LDSection;
     19 class NamePool;
     20 class LDSymbol;
     21 
     22 /** \class SectionSymbolSet
     23  *  \brief SectionSymbolSet contains the section symbols defined by linker for
     24  *   the output sections
     25  */
     26 class SectionSymbolSet {
     27  public:
     28   typedef SymbolCategory SymbolTable;
     29 
     30  public:
     31   SectionSymbolSet();
     32   ~SectionSymbolSet();
     33 
     34   /// add - create and add an section symbol for the output
     35   /// LDSection
     36   bool add(LDSection& pOutSect, NamePool& pNamePool);
     37 
     38   /// finalize - set section symbols' fragmentRef and push it into the output
     39   /// symbol table
     40   bool finalize(LDSection& pOutSect, SymbolTable& pSymTab, bool relocatable);
     41 
     42   /// get - get the section symbol for section pOutpSect
     43   LDSymbol* get(const LDSection& pOutSect);
     44   const LDSymbol* get(const LDSection& pOutSect) const;
     45 
     46  private:
     47   /// sectCompare - hash compare function for LDSection*
     48   struct SectCompare {
     49     bool operator()(const LDSection* X, const LDSection* Y) const {
     50       return (X == Y);
     51     }
     52   };
     53 
     54   /// SectPtrHash - hash function for LDSection*
     55   struct SectPtrHash {
     56     size_t operator()(const LDSection* pKey) const {
     57       return (unsigned((uintptr_t)pKey) >> 4) ^
     58              (unsigned((uintptr_t)pKey) >> 9);
     59     }
     60   };
     61 
     62   typedef HashEntry<const LDSection*, LDSymbol*, SectCompare> SectHashEntryType;
     63   typedef HashTable<SectHashEntryType,
     64                     SectPtrHash,
     65                     EntryFactory<SectHashEntryType> > SectHashTableType;
     66 
     67  private:
     68   SectHashTableType* m_pSectionSymbolMap;
     69 };
     70 
     71 }  // namespace mcld
     72 
     73 #endif  // MCLD_LD_SECTIONSYMBOLSET_H_
     74