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// -*- C++ -*-
//=============================================================================
/**
* @file Obstack_T.h
*
* $Id$
*
* @author Doug Schmidt <schmidt@cs.wustl.edu>
* @author Nanbor Wang <nanbor@cs.wustl.edu>
*/
//=============================================================================
#ifndef ACE_OBSTACK_T_H
#define ACE_OBSTACK_T_H
#include /**/ "ace/pre.h"
#include "ace/Obchunk.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
ACE_BEGIN_VERSIONED_NAMESPACE_DECL
class ACE_Allocator;
/**
* @class ACE_Obstack_T
*
* @brief Define a simple "mark and release" memory allocation utility.
*
* The implementation is similar to the GNU obstack utility,
* which is used extensively in the GCC compiler.
*/
template <class CHAR>
class ACE_Obstack_T
{
public:
// = Initialization and termination methods.
ACE_Obstack_T (size_t size = (4096 * sizeof (CHAR)) - sizeof (ACE_Obchunk),
ACE_Allocator *allocator_strategy = 0);
~ACE_Obstack_T (void);
/// Request Obstack to prepare a block at least @a len long for building
/// a new string. Return -1 if fail, 0 if success.
int request (size_t len);
/// Inserting a new CHAR \a c into the current building
/// block without freezing (null terminating) the block.
/// This function will create new chunk by checking the
/// boundary of current Obchunk. Return
/// the location \a c gets inserted to, or 0 if error.
CHAR *grow (CHAR c);
/// Inserting a new CHAR \a c into the current building
/// block without freezing (null terminating) the block and without
/// checking for out-of-bound error.
void grow_fast (CHAR c);
/// Freeze the current building block by null terminating it.
/// Return the starting address of the current building block, 0
/// if error occurs.
CHAR *freeze (void);
/// Copy the data into the current Obchunk and freeze the current
/// block. Return the starting address of the current building
/// block, 0 if error occurs. @a len specify the string length,
/// not the actually data size.
CHAR *copy (const CHAR *data,
size_t len);
/// Return the maximum @a length or @a size of a string that can be put
/// into this Obstack. @a size = @a length * sizeof (CHAR).
///
/// @deprecated No need to use this function as you can put objects of
/// arbitrary lengths into the obstack now.
size_t length (void) const;
size_t size (void) const;
/// "Unwind" the stack. If @a obj is a null pointer, everything allocated
/// in the stack is released. Otherwise, @a obj must be an address of an
/// object allocated in the stack. In this case, @a obj is released along
/// with everthing allocated in the Obstack since @a obj.
void unwind (void* obj);
/// "Release" the entire stack of Obchunks, putting it back on the free
/// list.
void release (void);
/// Dump the state of an object.
void dump (void) const;
/// Declare the dynamic allocation hooks.
ACE_ALLOC_HOOK_DECLARE;
protected:
class ACE_Obchunk *new_chunk (void);
/// Search through the list of Obchunks and release them. Helper funtion
/// used by unwind.
void unwind_i (void* obj);
/// Pointer to the allocator used by this Obstack.
ACE_Allocator *allocator_strategy_;
/// Current size of the Obstack;
size_t size_;
// Don't change the order of the following two fields.
/// Head of the Obchunk chain.
class ACE_Obchunk *head_;
/// Pointer to the current Obchunk.
class ACE_Obchunk *curr_;
};
ACE_END_VERSIONED_NAMESPACE_DECL
#if defined (__ACE_INLINE__)
#include "ace/Obstack_T.inl"
#endif /* __ACE_INLINE__ */
#if defined (ACE_TEMPLATES_REQUIRE_SOURCE)
#include "ace/Obstack_T.cpp"
#endif /* ACE_TEMPLATES_REQUIRE_SOURCE */
#if defined (ACE_TEMPLATES_REQUIRE_PRAGMA)
#pragma implementation ("Obstack_T.cpp")
#endif /* ACE_TEMPLATES_REQUIRE_PRAGMA */
#include /**/ "ace/post.h"
#endif /* ACE_OBSTACK_T_H */
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