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128 lines
3.7 KiB
C++
128 lines
3.7 KiB
C++
// -*- C++ -*-
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//=============================================================================
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/**
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* @file Obstack_T.h
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*
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* @author Doug Schmidt <schmidt@cs.wustl.edu>
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* @author Nanbor Wang <nanbor@cs.wustl.edu>
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*/
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//=============================================================================
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#ifndef ACE_OBSTACK_T_H
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#define ACE_OBSTACK_T_H
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#include /**/ "ace/pre.h"
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#include "ace/Obchunk.h"
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#if !defined (ACE_LACKS_PRAGMA_ONCE)
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# pragma once
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#endif /* ACE_LACKS_PRAGMA_ONCE */
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ACE_BEGIN_VERSIONED_NAMESPACE_DECL
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class ACE_Allocator;
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/**
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* @class ACE_Obstack_T
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*
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* @brief Define a simple "mark and release" memory allocation utility.
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*
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* The implementation is similar to the GNU obstack utility,
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* which is used extensively in the GCC compiler.
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*/
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template <class ACE_CHAR_T>
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class ACE_Obstack_T
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{
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public:
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// = Initialization and termination methods.
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ACE_Obstack_T (size_t size = (4096 * sizeof (ACE_CHAR_T)) - sizeof (ACE_Obchunk),
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ACE_Allocator *allocator_strategy = 0);
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~ACE_Obstack_T (void);
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/// Request Obstack to prepare a block at least @a len long for building
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/// a new string. Return -1 if fail, 0 if success.
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int request (size_t len);
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/// Inserting a new ACE_CHAR_T \a c into the current building block
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/// without freezing (null terminating) the block. This function
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/// will create new chunk by checking the boundary of current
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/// Obchunk. Return the location \a c gets inserted to, or 0 if
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/// error.
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ACE_CHAR_T *grow (ACE_CHAR_T c);
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/// Inserting a new ACE_CHAR_T \a c into the current building
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/// block without freezing (null terminating) the block and without
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/// checking for out-of-bound error.
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void grow_fast (ACE_CHAR_T c);
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/// Freeze the current building block by null terminating it.
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/// Return the starting address of the current building block, 0
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/// if error occurs.
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ACE_CHAR_T *freeze (void);
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/// Copy the data into the current Obchunk and freeze the current
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/// block. Return the starting address of the current building
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/// block, 0 if error occurs. @a len specify the string length,
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/// not the actually data size.
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ACE_CHAR_T *copy (const ACE_CHAR_T *data,
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size_t len);
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/// Return the maximum @a size
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size_t size (void) const;
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/// "Unwind" the stack. If @a obj is a null pointer, everything allocated
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/// in the stack is released. Otherwise, @a obj must be an address of an
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/// object allocated in the stack. In this case, @a obj is released along
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/// with everthing allocated in the Obstack since @a obj.
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void unwind (void *obj);
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/// "Release" the entire stack of Obchunks, putting it back on the free
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/// list.
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void release (void);
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/// Dump the state of an object.
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void dump (void) const;
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/// Declare the dynamic allocation hooks.
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ACE_ALLOC_HOOK_DECLARE;
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protected:
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class ACE_Obchunk *new_chunk (void);
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/// Search through the list of Obchunks and release them. Helper funtion
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/// used by unwind.
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void unwind_i (void *obj);
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/// Pointer to the allocator used by this Obstack.
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ACE_Allocator *allocator_strategy_;
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/// Current size of the Obstack;
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size_t size_;
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// Don't change the order of the following two fields.
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/// Head of the Obchunk chain.
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class ACE_Obchunk *head_;
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/// Pointer to the current Obchunk.
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class ACE_Obchunk *curr_;
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};
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ACE_END_VERSIONED_NAMESPACE_DECL
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#if defined (__ACE_INLINE__)
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#include "ace/Obstack_T.inl"
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#endif /* __ACE_INLINE__ */
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#if defined (ACE_TEMPLATES_REQUIRE_SOURCE)
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#include "ace/Obstack_T.cpp"
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#endif /* ACE_TEMPLATES_REQUIRE_SOURCE */
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#if defined (ACE_TEMPLATES_REQUIRE_PRAGMA)
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#pragma implementation ("Obstack_T.cpp")
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#endif /* ACE_TEMPLATES_REQUIRE_PRAGMA */
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#include /**/ "ace/post.h"
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#endif /* ACE_OBSTACK_T_H */
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