carve.cpp

来自「开放源码的编译器open watcom 1.6.0版的源代码」· C++ 代码 · 共 87 行

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// Carve -- carving support
//
// 95/02/02 -- J.W.Welch        -- defined

#include "Carve.h"


Carve::Carve                    // CONSTRUCTOR
    ( unsigned entry_size       // - size of an entry
    , unsigned block_size )     // - # entries / block
    : _size_entry( sizeof( CarveBlock ) > entry_size
                 ? sizeof( CarveBlock )
                 : entry_size )
    , _size_block( block_size )
{
}


Carve::~Carve                   // DESTRUCTOR
    ( void )
{
    RingIter iter( _blks );
    for( ; ; ) {
        CarveBlock* curr = (CarveBlock*)iter.next();
        if( 0 == curr ) break;
        delete[] curr->_data;
        delete curr;
    }
}


void* Carve::alloc              // ALLOCATOR
    ( void )
{
    void* retn = _freed.pop();
    if( 0 == retn ) {
        char* data = new char[ _size_block * _size_entry ];
        CarveBlock* blk = new CarveBlock;
        blk->_data = data;
        _blks.append( blk );
        for( int ctr = _size_block; ctr > 0; --ctr, data += _size_entry ) {
            _freed.append( (FreeElement*)data );
        }
        retn = _freed.pop();
    }
    return retn;
}


void Carve::free                // FREE AN ENTRY
    ( void* entry )             // - the entry
{
    _freed.push( (FreeElement*)entry );
}