defn.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 120 行

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*                            Open Watcom Project
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/*
    DEFN.HPP
    --------
    Module for handling "definitions", which associate symbols with
    with locations in the source code.
*/

#ifndef _DEFN_HPP
#define _DEFN_HPP

extern "C" {
#include "brmtypes.h"
}
#include "hashtbl.hpp"
#include "pool.hpp"

/*  Turn off memory tracking to redefine "new" and "delete"
*/
#undef new
#undef delete


class CacheOutFile;
class CacheInFile;


/*  Note:  in a DefnRec, the field Hashable::index is used to
           store the index of the symbol (DeclRec) which is being
           defined.  This is to facilitate finding the definition
           of a given symbol.
*/

struct DefnRec : public Hashable {
    private:
        static Pool _defnPool;
    public:
        uint_32         column;
        uint_32         line;
        BRI_StringID    filenameID;

        void    *operator new(size_t) { return _defnPool.Get(); }
        void    *operator new(size_t, const WChar *, const WChar *,
                              WULong) { return _defnPool.Get(); }
        void    operator delete(void *p) { _defnPool.Release(p); }
};


/*  DefnList:
      List of all definitions.
*/


class DefnList : private HashTable<DefnRec> {
    public:
        ~DefnList();

        void    AddDefinition( DefnRec * defn );
        void    AddTempDefinition( DefnRec * defn );
        void    AcceptDefns();

        // Iterate over all definitions.

        DefnRec *       First();
        DefnRec *       Next();

        // Iterate over definitions for a given symbol.

        DefnRec *       FirstDefnFor( BRI_SymbolID symbol );
        DefnRec *       NextDefn();

        // Save and load functionality.

        WBool           SaveTo( CacheOutFile *cache );
        WBool           LoadFrom( CacheInFile *cache );

    private:
        LList<DefnRec>  _tempDefns;
        Hashable *      _current;       // For iteration
        int             _currIndex;     // For iteration
};


/*  Restart memory tracking
*/
#include "wnew.hpp"

#endif  // _DEFN_HPP