/**
 * @file internal.h
 * @brief This header contains the definition of the internal allocator
 *        implementation and function pointers for the allocator virtual
 *        function table.
 * @author John Christman (sorakatadzuma@gmail.com)
 * @copyright Malunal Studios, LLC.
 */
#include "malunal/allocators.h"

#ifndef MALUNAL_ALLOCATORS_INTERNAL_HEADER
#define MALUNAL_ALLOCATORS_INTERNAL_HEADER

typedef allocation_error_t
(*allocator_initialize_pfn_t)(
  allocator_mptr_t allocator,
  allocator_mptr_t upstream,
  malunal_size_t   capacity
);

typedef allocation_error_t
(*allocator_finalize_pfn_t)(
  allocator_mptr_t allocator
);

typedef allocation_result_t
(*allocator_acquire_pfn_t)(
  allocator_mptr_t allocator,
  malunal_size_t   size
);

typedef allocation_result_t
(*allocator_reacquire_pfn_t)(
  allocator_mptr_t allocator,
  malunal_mptr_t   address,
  malunal_size_t   oldsize,
  malunal_size_t   newsize
);

typedef allocation_error_t
(*allocator_release_pfn_t)(
  allocator_mptr_t allocator,
  malunal_mptr_t   address,
  malunal_size_t   size
);


typedef struct {
  allocator_initialize_pfn_t const initialize;
  allocator_finalize_pfn_t   const finalize;
  allocator_acquire_pfn_t    const acquire;
  allocator_reacquire_pfn_t  const reacquire;
  allocator_release_pfn_t    const release;
} virtual_table_t;

typedef virtual_table_t* vtable_mptr_t;
typedef const virtual_table_t* vtable_iptr_t;


typedef struct {
  vtable_iptr_t const vtable;

  allocator_mptr_t upstream;
  malunal_mptr_t   context;
  malunal_size_t   allocated;
  malunal_size_t   reserved;
  malunal_size_t   acquires;
  malunal_size_t   releases;
} implementation_t;

typedef implementation_t* impl_mptr_t;
typedef const implementation_t* impl_iptr_t;


#endif /* MALUNAL_ALLOCATORS_INTERNAL_HEADER */