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<html><head><meta charset="UTF-8" /><title>coffi.ffi documentation</title><link rel="stylesheet" type="text/css" href="css/default.css" /><link rel="stylesheet" type="text/css" href="css/highlight.css" /><script type="text/javascript" src="js/highlight.min.js"></script><script type="text/javascript" src="js/jquery.min.js"></script><script type="text/javascript" src="js/page_effects.js"></script><script>hljs.initHighlightingOnLoad();</script></head><body><div id="header"><h2>Generated by <a href="https://github.com/weavejester/codox">Codox</a></h2><h1><a href="index.html"><span class="project-title"><span class="project-name">coffi</span> <span class="project-version">v1.0.486</span></span></a></h1></div><div class="sidebar primary"><h3 class="no-link"><span class="inner">Project</span></h3><ul class="index-link"><li class="depth-1 "><a href="index.html"><div class="inner">Index</div></a></li></ul><h3 class="no-link"><span class="inner">Topics</span></h3><ul><li class="depth-1 "><a href="01-Getting-Started.html"><div class="inner"><span>Getting Started</span></div></a></li><li class="depth-1 "><a href="02-Memory-Management.html"><div class="inner"><span>Memory Management</span></div></a></li><li class="depth-1 "><a href="03-Builtin-Types.html"><div class="inner"><span>Built-in Types</span></div></a></li><li class="depth-1 "><a href="04-Custom-Types.html"><div class="inner"><span>Custom Types</span></div></a></li><li class="depth-1 "><a href="05-Low-Level-Wrappers.html"><div class="inner"><span>Low-Level Wrappers</span></div></a></li><li class="depth-1 "><a href="50-Data-Model.html"><div class="inner"><span>Data Model</span></div></a></li><li class="depth-1 "><a href="99-Benchmarks.html"><div class="inner"><span>Benchmarks</span></div></a></li></ul><h3 class="no-link"><span class="inner">Namespaces</span></h3><ul><li class="depth-1"><div class="no-link"><div class="inner"><span class="tree"><span class="top"></span><span class="bottom"></span></span><span>coffi</span></div></div></li><li class="depth-2 branch current"><a href="coffi.ffi.html"><div class="inner"><span class="tree"><span class="top"></span><span class="bottom"></span></span><span>ffi</span></div></a></li><li class="depth-2 branch"><a href="coffi.layout.html"><div class="inner"><span class="tree"><span class="top"></span><span class="bottom"></span></span><span>layout</span></div></a></li><li class="depth-2"><a href="coffi.mem.html"><div class="inner"><span class="tree"><span class="top"></span><span class="bottom"></span></span><span>mem</span></div></a></li></ul></div><div class="sidebar secondary"><h3><a href="#top"><span class="inner">Public Vars</span></a></h3><ul><li class="depth-1"><a href="coffi.ffi.html#var-cfn"><div class="inner"><span>cfn</span></div></a></li><li class="depth-1"><a href="coffi.ffi.html#var-const"><div class="inner"><span>const</span></div></a></li><li class="depth-1"><a href="coffi.ffi.html#var-defcfn"><div class="inner"><span>defcfn</span></div></a></li><li class="depth-1"><a href="coffi.ffi.html#var-defconst"><div class="inner"><span>defconst</span></div></a></li><li class="depth-1"><a href="coffi.ffi.html#var-defvar"><div class="inner"><span>defvar</span></div></a></li><li class="depth-1"><a href="coffi.ffi.html#var-ensure-symbol"><div class="inner"><span>ensure-symbol</span></div></a></li><li class="depth-1"><a href="coffi.ffi.html#var-find-symbol"><div class="inner"><span>find-symbol</span></div></a></li><li class="depth-1"><a href="coffi.ffi.html#var-freset.21"><div class="inner"><span>freset!</span></div></a></li><li class="depth-1"><a href="coffi.ffi.html#var-fswap.21"><div class="inner"><span>fswap!</span></div></a></li><li class="depth-1"><a href="coffi.ffi.html#var-load-library"><div class="inner"><span>load-library</span></div></a></li><li class="depth-1"><a href="coffi.ffi.html#var-load-system-library"><div class="inner"><span>load-system-library</span></div></a></li><li class="depth-1"><a href="coffi.ffi.html#var-make-downcall"><div class="inner"><span>make-downcall</span></div></a></li><li class="depth-1"><a href="c
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</div></div><div class="public anchor" id="var-cfn"><h3>cfn</h3><div class="usage"><code>(cfn symbol args ret)</code></div><div class="doc"><div class="markdown"><p>Constructs a Clojure function to call the native function referenced by <code>symbol</code>.</p>
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<p>The function returned will serialize any passed arguments into the <code>args</code> types, and deserialize the return to the <code>ret</code> type.</p>
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<p>If your <code>args</code> and <code>ret</code> are constants, then it is more efficient to call <a href="coffi.ffi.html#var-make-downcall">make-downcall</a> followed by <a href="coffi.ffi.html#var-make-serde-wrapper">make-serde-wrapper</a> because the latter has an inline definition which will result in less overhead from serdes.</p>
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</div></div><div class="src-link"><a href="https://github.com/IGJoshua/coffi/blob/3c16e00fc1b7ca4d34d90c00003b7ea3785d9099/src/clj/coffi/ffi.clj#L438">view source</a></div></div><div class="public anchor" id="var-const"><h3>const</h3><div class="usage"><code>(const symbol-or-addr type)</code></div><div class="doc"><div class="markdown"><p>Gets the value of a constant stored in <code>symbol-or-addr</code>.</p>
</div></div><div class="src-link"><a href="https://github.com/IGJoshua/coffi/blob/3c16e00fc1b7ca4d34d90c00003b7ea3785d9099/src/clj/coffi/ffi.clj#L606">view source</a></div></div><div class="public anchor" id="var-defcfn"><h3>defcfn</h3><h4 class="type">macro</h4><div class="usage"><code>(defcfn name docstring? attr-map? symbol arg-types ret-type)</code><code>(defcfn name docstring? attr-map? symbol arg-types ret-type native-fn &amp; fn-tail)</code></div><div class="doc"><div class="markdown"><p>Defines a Clojure function which maps to a native function.</p>
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<p><code>name</code> is the symbol naming the resulting var. <code>symbol</code> is a symbol or string naming the library symbol to link against. <code>arg-types</code> is a vector of qualified keywords representing the argument types. <code>ret-type</code> is a single qualified keyword representing the return type. <code>fn-tail</code> is the body of the function (potentially with multiple arities) which wraps the native one. Inside the function, <code>native-fn</code> is bound to a function that will serialize its arguments, call the native function, and deserialize its return type. If any body is present, you must call this function in order to call the native code.</p>
<p>If no <code>fn-tail</code> is provided, then the resulting function will simply serialize the arguments according to <code>arg-types</code>, call the native function, and deserialize the return value.</p>
<p>The number of args in the <code>fn-tail</code> need not match the number of <code>arg-types</code> for the native function. It need only call the native wrapper function with the correct arguments.</p>
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<p>See <a href="coffi.mem.html#var-serialize">serialize</a>, <a href="coffi.mem.html#var-deserialize">deserialize</a>, <a href="coffi.ffi.html#var-make-downcall">make-downcall</a>.</p>
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</div></div><div class="src-link"><a href="https://github.com/IGJoshua/coffi/blob/3c16e00fc1b7ca4d34d90c00003b7ea3785d9099/src/clj/coffi/ffi.clj#L780">view source</a></div></div><div class="public anchor" id="var-defconst"><h3>defconst</h3><h4 class="type">macro</h4><div class="usage"><code>(defconst symbol docstring? symbol-or-addr type)</code></div><div class="doc"><div class="markdown"><p>Defines a var named by <code>symbol</code> to be the value of the given <code>type</code> from <code>symbol-or-addr</code>.</p>
</div></div><div class="src-link"><a href="https://github.com/IGJoshua/coffi/blob/3c16e00fc1b7ca4d34d90c00003b7ea3785d9099/src/clj/coffi/ffi.clj#L617">view source</a></div></div><div class="public anchor" id="var-defvar"><h3>defvar</h3><h4 class="type">macro</h4><div class="usage"><code>(defvar symbol docstring? symbol-or-addr type)</code></div><div class="doc"><div class="markdown"><p>Defines a var named by <code>symbol</code> to be a reference to the native memory from <code>symbol-or-addr</code>.</p>
</div></div><div class="src-link"><a href="https://github.com/IGJoshua/coffi/blob/3c16e00fc1b7ca4d34d90c00003b7ea3785d9099/src/clj/coffi/ffi.clj#L683">view source</a></div></div><div class="public anchor" id="var-ensure-symbol"><h3>ensure-symbol</h3><div class="usage"><code>(ensure-symbol symbol-or-addr)</code></div><div class="doc"><div class="markdown"><p>Returns the argument if it is a <a href="null">MemorySegment</a>, otherwise calls <a href="coffi.ffi.html#var-find-symbol">find-symbol</a> on it.</p>
</div></div><div class="src-link"><a href="https://github.com/IGJoshua/coffi/blob/3c16e00fc1b7ca4d34d90c00003b7ea3785d9099/src/clj/coffi/ffi.clj#L198">view source</a></div></div><div class="public anchor" id="var-find-symbol"><h3>find-symbol</h3><div class="usage"><code>(find-symbol sym)</code></div><div class="doc"><div class="markdown"><p>Gets the <a href="null">MemorySegment</a> of a symbol from the loaded libraries.</p>
</div></div><div class="src-link"><a href="https://github.com/IGJoshua/coffi/blob/3c16e00fc1b7ca4d34d90c00003b7ea3785d9099/src/clj/coffi/ffi.clj#L38">view source</a></div></div><div class="public anchor" id="var-freset.21"><h3>freset!</h3><div class="usage"><code>(freset! static-var newval)</code></div><div class="doc"><div class="markdown"><p>Sets the value of <code>static-var</code> to <code>newval</code>, running it through <a href="coffi.mem.html#var-serialize">serialize</a>.</p>
</div></div><div class="src-link"><a href="https://github.com/IGJoshua/coffi/blob/3c16e00fc1b7ca4d34d90c00003b7ea3785d9099/src/clj/coffi/ffi.clj#L647">view source</a></div></div><div class="public anchor" id="var-fswap.21"><h3>fswap!</h3><div class="usage"><code>(fswap! static-var f &amp; args)</code></div><div class="doc"><div class="markdown"><p>Non-atomically runs the function <code>f</code> over the value stored in <code>static-var</code>.</p>
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<p>The value is deserialized before passing it to <code>f</code>, and serialized before putting the value into <code>static-var</code>.</p>
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</div></div><div class="src-link"><a href="https://github.com/IGJoshua/coffi/blob/3c16e00fc1b7ca4d34d90c00003b7ea3785d9099/src/clj/coffi/ffi.clj#L656">view source</a></div></div><div class="public anchor" id="var-load-library"><h3>load-library</h3><div class="usage"><code>(load-library path)</code></div><div class="doc"><div class="markdown"><p>Loads the library at <code>path</code>.</p>
</div></div><div class="src-link"><a href="https://github.com/IGJoshua/coffi/blob/3c16e00fc1b7ca4d34d90c00003b7ea3785d9099/src/clj/coffi/ffi.clj#L33">view source</a></div></div><div class="public anchor" id="var-load-system-library"><h3>load-system-library</h3><div class="usage"><code>(load-system-library libname)</code></div><div class="doc"><div class="markdown"><p>Loads the library named <code>libname</code> from the system’s load path.</p>
</div></div><div class="src-link"><a href="https://github.com/IGJoshua/coffi/blob/3c16e00fc1b7ca4d34d90c00003b7ea3785d9099/src/clj/coffi/ffi.clj#L28">view source</a></div></div><div class="public anchor" id="var-make-downcall"><h3>make-downcall</h3><div class="usage"><code>(make-downcall symbol-or-addr args ret)</code></div><div class="doc"><div class="markdown"><p>Constructs a downcall function reference to <code>symbol-or-addr</code> with the given <code>args</code> and <code>ret</code> types.</p>
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<p>The function returned takes only arguments whose types match exactly the <a href="coffi.mem.html#var-java-layout">java-layout</a> for that type, and returns an argument with exactly the <a href="coffi.mem.html#var-java-layout">java-layout</a> of the <code>ret</code> type. This function will perform no serialization or deserialization of arguments or the return type.</p>
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<p>If the <code>ret</code> type is non-primitive, then the returned function will take a first argument of a <a href="null">SegmentAllocator</a>.</p>
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</div></div><div class="src-link"><a href="https://github.com/IGJoshua/coffi/blob/3c16e00fc1b7ca4d34d90c00003b7ea3785d9099/src/clj/coffi/ffi.clj#L206">view source</a></div></div><div class="public anchor" id="var-make-serde-varargs-wrapper"><h3>make-serde-varargs-wrapper</h3><div class="usage"><code>(make-serde-varargs-wrapper varargs-factory required-args ret-type)</code></div><div class="doc"><div class="markdown"><p>Constructs a wrapper function for the <code>varargs-factory</code> which produces functions that serialize the arguments and deserialize the return value.</p>
</div></div><div class="src-link"><a href="https://github.com/IGJoshua/coffi/blob/3c16e00fc1b7ca4d34d90c00003b7ea3785d9099/src/clj/coffi/ffi.clj#L426">view source</a></div></div><div class="public anchor" id="var-make-serde-wrapper"><h3>make-serde-wrapper</h3><div class="usage"><code>(make-serde-wrapper downcall arg-types ret-type)</code></div><div class="doc"><div class="markdown"><p>Constructs a wrapper function for the <code>downcall</code> which serializes the arguments and deserializes the return value.</p>
</div></div><div class="src-link"><a href="https://github.com/IGJoshua/coffi/blob/3c16e00fc1b7ca4d34d90c00003b7ea3785d9099/src/clj/coffi/ffi.clj#L407">view source</a></div></div><div class="public anchor" id="var-make-varargs-factory"><h3>make-varargs-factory</h3><div class="usage"><code>(make-varargs-factory symbol required-args ret)</code></div><div class="doc"><div class="markdown"><p>Returns a function for constructing downcalls with additional types for arguments.</p>
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<p>The <code>required-args</code> are the types of the first arguments passed to the downcall handle, and the values passed to the returned function are only the varargs types.</p>
<p>The returned function is memoized, so that only one downcall function will be generated per combination of argument types.</p>
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<p>See <a href="coffi.ffi.html#var-make-downcall">make-downcall</a>.</p>
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</div></div><div class="src-link"><a href="https://github.com/IGJoshua/coffi/blob/3c16e00fc1b7ca4d34d90c00003b7ea3785d9099/src/clj/coffi/ffi.clj#L222">view source</a></div></div><div class="public anchor" id="var-reify-libspec"><h3>reify-libspec</h3><div class="usage"><code>(reify-libspec libspec)</code></div><div class="doc"><div class="markdown"><p>Loads all the symbols specified in the <code>libspec</code>.</p>
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<p>The value of each key of the passed map is transformed as by <a href="coffi.ffi.html#var-reify-symbolspec">reify-symbolspec</a>.</p>
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</div></div><div class="src-link"><a href="https://github.com/IGJoshua/coffi/blob/3c16e00fc1b7ca4d34d90c00003b7ea3785d9099/src/clj/coffi/ffi.clj#L742">view source</a></div></div><div class="public anchor" id="var-reify-symbolspec"><h3>reify-symbolspec</h3><h4 class="type">multimethod</h4><div class="usage"></div><div class="doc"><div class="markdown"><p>Takes a spec for a symbol reference and returns a live value for that type.</p>
</div></div><div class="src-link"><a href="https://github.com/IGJoshua/coffi/blob/3c16e00fc1b7ca4d34d90c00003b7ea3785d9099/src/clj/coffi/ffi.clj#L701">view source</a></div></div><div class="public anchor" id="var-static-variable"><h3>static-variable</h3><div class="usage"><code>(static-variable symbol-or-addr type)</code></div><div class="doc"><div class="markdown"><p>Constructs a reference to a mutable value stored in <code>symbol-or-addr</code>.</p>
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<p>The returned value can be dereferenced, and has metadata.</p>
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<p>See <a href="coffi.ffi.html#var-freset.21">freset!</a>, <a href="coffi.ffi.html#var-fswap.21">fswap!</a>.</p>
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</div></div><div class="src-link"><a href="https://github.com/IGJoshua/coffi/blob/3c16e00fc1b7ca4d34d90c00003b7ea3785d9099/src/clj/coffi/ffi.clj#L672">view source</a></div></div><div class="public anchor" id="var-static-variable-segment"><h3>static-variable-segment</h3><div class="usage"><code>(static-variable-segment static-var)</code></div><div class="doc"><div class="markdown"><p>Gets the backing <a href="null">MemorySegment</a> from <code>static-var</code>.</p>
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<p>This is primarily useful when you need to pass the static variable’s address to a native function which takes an <a href="null">Addressable</a>.</p>
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</div></div><div class="src-link"><a href="https://github.com/IGJoshua/coffi/blob/3c16e00fc1b7ca4d34d90c00003b7ea3785d9099/src/clj/coffi/ffi.clj#L664">view source</a></div></div><div class="public anchor" id="var-vacfn-factory"><h3>vacfn-factory</h3><div class="usage"><code>(vacfn-factory symbol required-args ret)</code></div><div class="doc"><div class="markdown"><p>Constructs a varargs factory to call the native function referenced by <code>symbol</code>.</p>
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<p>The function returned takes any number of type arguments and returns a specialized Clojure function for calling the native function with those arguments.</p>
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