Roland Conybeare
6a82040d48
subrepo: subdir: "xo-alloc2" merged: "4039c29f" upstream: origin: "git@github.com:Rconybea/xo-alloc2.git" branch: "main" commit: "4039c29f" git-subrepo: version: "0.4.9" origin: "???" commit: "???"
102 lines
3.6 KiB
ReStructuredText
102 lines
3.6 KiB
ReStructuredText
.. _DArena-reference:
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DArena
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======
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Native arena allocator
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Context
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-------
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.. ditaa::
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:--scale: 0.99
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+----------------------+-------------------------+-----------------------------------+
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| RAllocator | RAllocIterator | IAllocator_DArena |
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| | | IAllocIterator_DArenaIterator |
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+----------------------+-------------------------+-----------------------------------+
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| IAllocator_Xfer | IAllocIterator_Xfer | DArena cBLU |
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| IAllocator_Any | IAllocIterator_Any +-----------------------------------+
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| IAllocator_Impltype | IAllocIterator_Impltype | DArenaIterator |
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| | | |
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+----------------------+-------------------------+-----------------------------------+
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| AAllocator | AAllocIterator | ArenaConfig |
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+----------------------+-------------------------+-----------------------------------+
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+-----------------+----------------------------------------------+-------------------+
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| | AllocInfo | |
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| +----------------------------------------------+ |
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| AllocError | AllocHeaderConfig | cmpresult |
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| +----------------------------------------------+ |
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| | AllocHeader | |
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+-----------------+----------------------------------------------+-------------------+
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.. code-block:: cpp
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#include <xo/alloc2/DArena.hpp>
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Arena memory layout
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~~~~~~~~~~~~~~~~~~~
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.. code-block:: text
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<------------------------reserved-------------------------->
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<------------committed-----------><-------uncommitted------>
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<--allocated--><----available---->
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XXXXXXXXXXXXXXX___________________..........................
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^ ^ ^ ^
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lo free limit hi
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[X] allocated: in use
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[_] committed: physical memory obtained
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[.] uncommitted: mapped in virtual memory, not backed by memory
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Representation for a single allocation
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.. code-block:: text
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free_(pre)
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v
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<-------------z1--------------->
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< guard >< hz >< req_z >< dz >< guard >
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used <== +++++++++0000zzzz@@@@@@@@@@@@@@@@@ppppppp+++++++++ ==> avail
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^ ^ ^
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header mem |
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^ |
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last_header_ free_(post)
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[+] guard surrounding each allocation, for simple sanitize checks
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[0] unused header bits (available for application metadata)
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[z] record allocation size
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[@] new allocated memory
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[p] padding (to uintptr_t alignment)
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Class
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-----
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.. doxygenclass:: xo::mm::DArena
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Member Variables
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----------------
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.. doxygengroup:: mm-arena-instance-vars
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Type Traits
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-----------
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.. doxygengroup:: mm-arena-traits
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Constructors
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------------
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.. doxygengroup:: mm-arena-ctors
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Methods
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-------
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.. doxygengroup:: mm-arena-methods
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