71 lines
2 KiB
Text
71 lines
2 KiB
Text
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/**
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* PANDA 3D SOFTWARE
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* Copyright (c) Carnegie Mellon University. All rights reserved.
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*
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* All use of this software is subject to the terms of the revised BSD
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* license. You should have received a copy of this license along
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* with this source code in a file named "LICENSE."
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*
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* @file deletedBufferChain.I
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* @author drose
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* @date 2007-07-20
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*/
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/**
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* Returns true if the pointer is valid, false if it has been deleted or if it
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* was never a valid pointer.
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*
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* This is only meaningful in debug mode, where USE_DELETEDCHAINFLAG is
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* defined. If not, this trivially returns true.
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*/
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INLINE bool DeletedBufferChain::
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validate(void *ptr) {
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TAU_PROFILE("bool DeletedBufferChain::validate(void *)", " ", TAU_USER);
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if (ptr == nullptr) {
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return false;
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}
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#if defined(USE_DELETEDCHAINFLAG) && defined(USE_DELETED_CHAIN)
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const ObjectNode *obj = buffer_to_node(ptr);
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return AtomicAdjust::get(obj->_flag) == DCF_alive;
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#else
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return true;
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#endif // USE_DELETEDCHAINFLAG
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}
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/**
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* Returns the size of the buffer that is actually returned at each request.
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*/
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INLINE size_t DeletedBufferChain::
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get_buffer_size() const {
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return _buffer_size;
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}
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/**
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* Casts an ObjectNode* to a void* buffer.
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*/
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INLINE void *DeletedBufferChain::
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node_to_buffer(DeletedBufferChain::ObjectNode *node) {
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#if defined(USE_DELETEDCHAINFLAG) && defined(USE_DELETED_CHAIN)
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// In development mode, we increment the pointer so that the returned data
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// does not overlap our _flag member.
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return (void *)(((char *)node) + flag_reserved_bytes);
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#else
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return (void *)node;
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#endif // NDEBUG
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}
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/**
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* Casts a void* buffer to an ObjectNode* .
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*/
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INLINE DeletedBufferChain::ObjectNode *DeletedBufferChain::
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buffer_to_node(void *ptr) {
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#if defined(USE_DELETEDCHAINFLAG) && defined(USE_DELETED_CHAIN)
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// In development mode, we decrement the pointer to undo the increment we
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// did above.
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return (ObjectNode *)(((char *)ptr) - flag_reserved_bytes);
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#else
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return (ObjectNode *)ptr;
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#endif // NDEBUG
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}
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