mirror of
https://github.com/microsoft/mimalloc.git
synced 2024-12-28 22:05:40 +08:00
142 lines
15 KiB
HTML
142 lines
15 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
|
<html xmlns="http://www.w3.org/1999/xhtml">
|
|
<head>
|
|
<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
|
|
<meta http-equiv="X-UA-Compatible" content="IE=9"/>
|
|
<meta name="generator" content="Doxygen 1.8.15"/>
|
|
<meta name="viewport" content="width=device-width, initial-scale=1"/>
|
|
<title>mi-malloc: Overriding Malloc</title>
|
|
<link href="tabs.css" rel="stylesheet" type="text/css"/>
|
|
<script type="text/javascript" src="jquery.js"></script>
|
|
<script type="text/javascript" src="dynsections.js"></script>
|
|
<link href="navtree.css" rel="stylesheet" type="text/css"/>
|
|
<script type="text/javascript" src="resize.js"></script>
|
|
<script type="text/javascript" src="navtreedata.js"></script>
|
|
<script type="text/javascript" src="navtree.js"></script>
|
|
<script type="text/javascript">
|
|
/* @license magnet:?xt=urn:btih:cf05388f2679ee054f2beb29a391d25f4e673ac3&dn=gpl-2.0.txt GPL-v2 */
|
|
$(document).ready(initResizable);
|
|
/* @license-end */</script>
|
|
<link href="search/search.css" rel="stylesheet" type="text/css"/>
|
|
<script type="text/javascript" src="search/searchdata.js"></script>
|
|
<script type="text/javascript" src="search/search.js"></script>
|
|
<script type="text/javascript">
|
|
/* @license magnet:?xt=urn:btih:cf05388f2679ee054f2beb29a391d25f4e673ac3&dn=gpl-2.0.txt GPL-v2 */
|
|
$(document).ready(function() { init_search(); });
|
|
/* @license-end */
|
|
</script>
|
|
<link href="doxygen.css" rel="stylesheet" type="text/css" />
|
|
<link href="mimalloc-doxygen.css" rel="stylesheet" type="text/css"/>
|
|
</head>
|
|
<body>
|
|
<div id="top"><!-- do not remove this div, it is closed by doxygen! -->
|
|
<div id="titlearea">
|
|
<table cellspacing="0" cellpadding="0">
|
|
<tbody>
|
|
<tr style="height: 56px;">
|
|
<td id="projectlogo"><img alt="Logo" src="mimalloc-logo.svg"/></td>
|
|
<td id="projectalign" style="padding-left: 0.5em;">
|
|
<div id="projectname">mi-malloc
|
|
 <span id="projectnumber">1.0</span>
|
|
</div>
|
|
</td>
|
|
<td> <div id="MSearchBox" class="MSearchBoxInactive">
|
|
<span class="left">
|
|
<img id="MSearchSelect" src="search/mag_sel.png"
|
|
onmouseover="return searchBox.OnSearchSelectShow()"
|
|
onmouseout="return searchBox.OnSearchSelectHide()"
|
|
alt=""/>
|
|
<input type="text" id="MSearchField" value="Search" accesskey="S"
|
|
onfocus="searchBox.OnSearchFieldFocus(true)"
|
|
onblur="searchBox.OnSearchFieldFocus(false)"
|
|
onkeyup="searchBox.OnSearchFieldChange(event)"/>
|
|
</span><span class="right">
|
|
<a id="MSearchClose" href="javascript:searchBox.CloseResultsWindow()"><img id="MSearchCloseImg" border="0" src="search/close.png" alt=""/></a>
|
|
</span>
|
|
</div>
|
|
</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
</div>
|
|
<!-- end header part -->
|
|
<!-- Generated by Doxygen 1.8.15 -->
|
|
<script type="text/javascript">
|
|
/* @license magnet:?xt=urn:btih:cf05388f2679ee054f2beb29a391d25f4e673ac3&dn=gpl-2.0.txt GPL-v2 */
|
|
var searchBox = new SearchBox("searchBox", "search",false,'Search');
|
|
/* @license-end */
|
|
</script>
|
|
</div><!-- top -->
|
|
<div id="side-nav" class="ui-resizable side-nav-resizable">
|
|
<div id="nav-tree">
|
|
<div id="nav-tree-contents">
|
|
<div id="nav-sync" class="sync"></div>
|
|
</div>
|
|
</div>
|
|
<div id="splitbar" style="-moz-user-select:none;"
|
|
class="ui-resizable-handle">
|
|
</div>
|
|
</div>
|
|
<script type="text/javascript">
|
|
/* @license magnet:?xt=urn:btih:cf05388f2679ee054f2beb29a391d25f4e673ac3&dn=gpl-2.0.txt GPL-v2 */
|
|
$(document).ready(function(){initNavTree('overrides.html','');});
|
|
/* @license-end */
|
|
</script>
|
|
<div id="doc-content">
|
|
<!-- window showing the filter options -->
|
|
<div id="MSearchSelectWindow"
|
|
onmouseover="return searchBox.OnSearchSelectShow()"
|
|
onmouseout="return searchBox.OnSearchSelectHide()"
|
|
onkeydown="return searchBox.OnSearchSelectKey(event)">
|
|
</div>
|
|
|
|
<!-- iframe showing the search results (closed by default) -->
|
|
<div id="MSearchResultsWindow">
|
|
<iframe src="javascript:void(0)" frameborder="0"
|
|
name="MSearchResults" id="MSearchResults">
|
|
</iframe>
|
|
</div>
|
|
|
|
<div class="PageDoc"><div class="header">
|
|
<div class="headertitle">
|
|
<div class="title">Overriding Malloc </div> </div>
|
|
</div><!--header-->
|
|
<div class="contents">
|
|
<div class="textblock"><p>Overriding the standard <code>malloc</code> can be done either <em>dynamically</em> or <em>statically</em>.</p>
|
|
<h2>Dynamic override</h2>
|
|
<p>This is the recommended way to override the standard malloc interface.</p>
|
|
<h3>Linux, BSD</h3>
|
|
<p>On these systems we preload the mimalloc shared library so all calls to the standard <code>malloc</code> interface are resolved to the <em>mimalloc</em> library.</p>
|
|
<ul>
|
|
<li><code>env LD_PRELOAD=/usr/lib/libmimalloc.so myprogram</code></li>
|
|
</ul>
|
|
<p>You can set extra environment variables to check that mimalloc is running, like: </p><div class="fragment"><div class="line">env MIMALLOC_VERBOSE=1 LD_PRELOAD=/usr/lib/libmimalloc.so myprogram</div></div><!-- fragment --><p> or run with the debug version to get detailed statistics: </p><div class="fragment"><div class="line">env MIMALLOC_SHOW_STATS=1 LD_PRELOAD=/usr/lib/libmimalloc-debug.so myprogram</div></div><!-- fragment --><h3>MacOS</h3>
|
|
<p>On macOS we can also preload the mimalloc shared library so all calls to the standard <code>malloc</code> interface are resolved to the <em>mimalloc</em> library.</p>
|
|
<ul>
|
|
<li><code>env DYLD_FORCE_FLAT_NAMESPACE=1 DYLD_INSERT_LIBRARIES=/usr/lib/libmimalloc.dylib myprogram</code></li>
|
|
</ul>
|
|
<p>Note that certain security restrictions may apply when doing this from the <a href="https://stackoverflow.com/questions/43941322/dyld-insert-libraries-ignored-when-calling-application-through-bash">shell</a>.</p>
|
|
<p>Note: unfortunately, at this time, dynamic overriding on macOS seems broken but it is actively worked on to fix this (see issue <a href="https://github.com/microsoft/mimalloc/issues/50"><code>#50</code></a>).</p>
|
|
<h3>Windows</h3>
|
|
<p>On Windows you need to link your program explicitly with the mimalloc DLL and use the C-runtime library as a DLL (using the <code>/MD</code> or <code>/MDd</code> switch). Moreover, you need to ensure the <code>mimalloc-redirect.dll</code> (or <code>mimalloc-redirect32.dll</code>) is available in the same folder as the mimalloc DLL at runtime (as it as referred to by the mimalloc DLL). The redirection DLL's ensure all calls to the C runtime malloc API get redirected to mimalloc.</p>
|
|
<p>To ensure the mimalloc DLL is loaded at run-time it is easiest to insert some call to the mimalloc API in the <code>main</code> function, like <code>mi_version()</code> (or use the <code>/INCLUDE:mi_version</code> switch on the linker). See the <code>mimalloc-override-test</code> project for an example on how to use this.</p>
|
|
<p>The environment variable <code>MIMALLOC_DISABLE_REDIRECT=1</code> can be used to disable dynamic overriding at run-time. Use <code>MIMALLOC_VERBOSE=1</code> to check if mimalloc successfully redirected.</p>
|
|
<p>(Note: in principle, it should be possible to patch existing executables that are linked with the dynamic C runtime (<code>ucrtbase.dll</code>) by just putting the mimalloc DLL into the import table (and putting <code>mimalloc-redirect.dll</code> in the same folder) Such patching can be done for example with <a href="https://ntcore.com/?page_id=388">CFF Explorer</a>).</p>
|
|
<h2>Static override</h2>
|
|
<p>On Unix systems, you can also statically link with <em>mimalloc</em> to override the standard malloc interface. The recommended way is to link the final program with the <em>mimalloc</em> single object file (<code>mimalloc-override.o</code>). We use an object file instead of a library file as linkers give preference to that over archives to resolve symbols. To ensure that the standard malloc interface resolves to the <em>mimalloc</em> library, link it as the first object file. For example:</p>
|
|
<div class="fragment"><div class="line">gcc -o myprogram mimalloc-<span class="keyword">override</span>.o myfile1.c ...</div></div><!-- fragment --><h2>List of Overrides:</h2>
|
|
<p>The specific functions that get redirected to the <em>mimalloc</em> library are:</p>
|
|
<div class="fragment"><div class="line"><span class="comment">// C</span></div><div class="line"><span class="keywordtype">void</span>* malloc(<span class="keywordtype">size_t</span> size);</div><div class="line"><span class="keywordtype">void</span>* calloc(<span class="keywordtype">size_t</span> size, <span class="keywordtype">size_t</span> n);</div><div class="line"><span class="keywordtype">void</span>* realloc(<span class="keywordtype">void</span>* p, <span class="keywordtype">size_t</span> newsize);</div><div class="line"><span class="keywordtype">void</span> free(<span class="keywordtype">void</span>* p);</div><div class="line"></div><div class="line"><span class="comment">// C++</span></div><div class="line"><span class="keywordtype">void</span> <span class="keyword">operator</span> <span class="keyword">delete</span>(<span class="keywordtype">void</span>* p);</div><div class="line"><span class="keywordtype">void</span> <span class="keyword">operator</span> <span class="keyword">delete</span>[](<span class="keywordtype">void</span>* p);</div><div class="line"></div><div class="line"><span class="keywordtype">void</span>* <span class="keyword">operator</span> <span class="keyword">new</span>(std::size_t n) noexcept(<span class="keyword">false</span>);</div><div class="line"><span class="keywordtype">void</span>* <span class="keyword">operator</span> <span class="keyword">new</span>[](std::size_t n) noexcept(<span class="keyword">false</span>);</div><div class="line"><span class="keywordtype">void</span>* <span class="keyword">operator</span> <span class="keyword">new</span>( std::size_t n, std::align_val_t align) noexcept(<span class="keyword">false</span>);</div><div class="line"><span class="keywordtype">void</span>* <span class="keyword">operator</span> <span class="keyword">new</span>[]( std::size_t n, std::align_val_t align) noexcept(<span class="keyword">false</span>);</div><div class="line"></div><div class="line"><span class="keywordtype">void</span>* <span class="keyword">operator</span> <span class="keyword">new</span> ( std::size_t count, <span class="keyword">const</span> std::nothrow_t& tag);</div><div class="line"><span class="keywordtype">void</span>* <span class="keyword">operator</span> <span class="keyword">new</span>[]( std::size_t count, <span class="keyword">const</span> std::nothrow_t& tag);</div><div class="line"><span class="keywordtype">void</span>* <span class="keyword">operator</span> <span class="keyword">new</span> ( std::size_t count, std::align_val_t al, <span class="keyword">const</span> std::nothrow_t&);</div><div class="line"><span class="keywordtype">void</span>* <span class="keyword">operator</span> <span class="keyword">new</span>[]( std::size_t count, std::align_val_t al, <span class="keyword">const</span> std::nothrow_t&);</div><div class="line"></div><div class="line"><span class="comment">// Posix</span></div><div class="line"><span class="keywordtype">int</span> posix_memalign(<span class="keywordtype">void</span>** p, <span class="keywordtype">size_t</span> alignment, <span class="keywordtype">size_t</span> size);</div><div class="line"></div><div class="line"><span class="comment">// Linux</span></div><div class="line"><span class="keywordtype">void</span>* memalign(<span class="keywordtype">size_t</span> alignment, <span class="keywordtype">size_t</span> size);</div><div class="line"><span class="keywordtype">void</span>* aligned_alloc(<span class="keywordtype">size_t</span> alignment, <span class="keywordtype">size_t</span> size);</div><div class="line"><span class="keywordtype">void</span>* valloc(<span class="keywordtype">size_t</span> size);</div><div class="line"><span class="keywordtype">void</span>* pvalloc(<span class="keywordtype">size_t</span> size);</div><div class="line"><span class="keywordtype">size_t</span> malloc_usable_size(<span class="keywordtype">void</span> *p);</div><div class="line"></div><div class="line"><span class="comment">// BSD</span></div><div class="line"><span class="keywordtype">void</span>* reallocarray( <span class="keywordtype">void</span>* p, <span class="keywordtype">size_t</span> count, <span class="keywordtype">size_t</span> size );</div><div class="line"><span class="keywordtype">void</span>* reallocf(<span class="keywordtype">void</span>* p, <span class="keywordtype">size_t</span> newsize);</div><div class="line"><span class="keywordtype">void</span> cfree(<span class="keywordtype">void</span>* p);</div><div class="line"></div><div class="line"><span class="comment">// Windows</span></div><div class="line"><span class="keywordtype">void</span>* _expand(<span class="keywordtype">void</span>* p, <span class="keywordtype">size_t</span> newsize);</div><div class="line"><span class="keywordtype">size_t</span> _msize(<span class="keywordtype">void</span>* p);</div><div class="line"></div><div class="line"><span class="keywordtype">void</span>* _malloc_dbg(<span class="keywordtype">size_t</span> size, <span class="keywordtype">int</span> block_type, <span class="keyword">const</span> <span class="keywordtype">char</span>* fname, <span class="keywordtype">int</span> line);</div><div class="line"><span class="keywordtype">void</span>* _realloc_dbg(<span class="keywordtype">void</span>* p, <span class="keywordtype">size_t</span> newsize, <span class="keywordtype">int</span> block_type, <span class="keyword">const</span> <span class="keywordtype">char</span>* fname, <span class="keywordtype">int</span> line);</div><div class="line"><span class="keywordtype">void</span>* _calloc_dbg(<span class="keywordtype">size_t</span> count, <span class="keywordtype">size_t</span> size, <span class="keywordtype">int</span> block_type, <span class="keyword">const</span> <span class="keywordtype">char</span>* fname, <span class="keywordtype">int</span> line);</div><div class="line"><span class="keywordtype">void</span>* _expand_dbg(<span class="keywordtype">void</span>* p, <span class="keywordtype">size_t</span> size, <span class="keywordtype">int</span> block_type, <span class="keyword">const</span> <span class="keywordtype">char</span>* fname, <span class="keywordtype">int</span> line);</div><div class="line"><span class="keywordtype">size_t</span> _msize_dbg(<span class="keywordtype">void</span>* p, <span class="keywordtype">int</span> block_type);</div><div class="line"><span class="keywordtype">void</span> _free_dbg(<span class="keywordtype">void</span>* p, <span class="keywordtype">int</span> block_type);</div></div><!-- fragment --> </div></div><!-- PageDoc -->
|
|
</div><!-- contents -->
|
|
</div><!-- doc-content -->
|
|
<!-- start footer part -->
|
|
<div id="nav-path" class="navpath"><!-- id is needed for treeview function! -->
|
|
<ul>
|
|
<li class="footer">Generated by
|
|
<a href="http://www.doxygen.org/index.html">
|
|
<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.8.15 </li>
|
|
</ul>
|
|
</div>
|
|
</body>
|
|
</html>
|