symdis.hpp

来自「开放源码的编译器open watcom 1.6.0版的源代码」· HPP 代码 · 共 105 行

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#ifndef SYMDIS_H_INCLUDED
#define SYMDIS_H_INCLUDED

#include "subsect.hpp"

class SymbolStruct;

typedef SymbolStruct* (*PCFN)( const char* );

static const BASE_ADR1 = S_ENTRYTHIS + 1;
static const BASE_ADR2 = BASE_ADR1 + (S_REGREL16-S_BPREL16) + 1;
static const BASE_ADR3 = BASE_ADR2 + (S_GTHREAD32-S_BPREL32) + 1;

class SymbolDistributor {

    friend class CSEntryThis;

    public :

        SymbolDistributor( Retriever&    retriever,
                           SstGlobalSym& globalSym,
                           SstStaticSym& staticSym )
                : _retriever( retriever ),
                  _globalSym( globalSym ),
                  _staticSym( staticSym ) { }

        ~SymbolDistributor() { }

        bool Distribute( const uint, SstAlignSym& ) const;

    private :

        static uint ConvertIndex( const symbol_index index ) {
            if ( index < S_BPREL16 ) {
                return index;
            }
            if ( index < S_BPREL32 ) {
                return BASE_ADR1 + (index - S_BPREL16);
            }
            if ( index < S_PROCREF ) {
                return BASE_ADR2 + (index - S_BPREL32);
            }
            if ( index <= S_ALIGN ) {
                return BASE_ADR3 + (index - S_PROCREF);
            }
            return 0;
        }

        static SymbolStruct* CreateSym( const char* ptr ) {
            symbol_index index = * (symbol_index *) ( ptr + WORD );
            return _symConstructorTable[ConvertIndex(index)](ptr);
        }

        static CSProcRef* CreateProcRef( SymbolStruct* sym,
                                         const uint    module ) {
            return new CSProcRef( sym, module );
        }

        static CSDataRef* CreateDataRef( SymbolStruct* sym,
                                         const uint    module ) {
            return new CSDataRef( sym, module );
        }

        void Build( const char*, const uint, SstAlignSym& ) const;

        Retriever&      _retriever;
        SstGlobalSym&   _globalSym;
        SstStaticSym&   _staticSym;

        static PCFN     _symConstructorTable[];
};
#endif