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+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://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/html; charset=UTF-8" /><title>32.4. Extensibility</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><link rel="prev" href="jit-configuration.html" title="32.3. Configuration" /><link rel="next" href="regress.html" title="Chapter 33. Regression Tests" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">32.4. Extensibility</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="jit-configuration.html" title="32.3. Configuration">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="jit.html" title="Chapter 32. Just-in-Time Compilation (JIT)">Up</a></td><th width="60%" align="center">Chapter 32. Just-in-Time Compilation (<acronym class="acronym">JIT</acronym>)</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 15.5 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="regress.html" title="Chapter 33. Regression Tests">Next</a></td></tr></table><hr /></div><div class="sect1" id="JIT-EXTENSIBILITY"><div class="titlepage"><div><div><h2 class="title" style="clear: both">32.4. Extensibility</h2></div></div></div><div class="toc"><dl class="toc"><dt><span class="sect2"><a href="jit-extensibility.html#JIT-EXTENSIBILITY-BITCODE">32.4.1. Inlining Support for Extensions</a></span></dt><dt><span class="sect2"><a href="jit-extensibility.html#JIT-PLUGGABLE">32.4.2. Pluggable <acronym class="acronym">JIT</acronym> Providers</a></span></dt></dl></div><div class="sect2" id="JIT-EXTENSIBILITY-BITCODE"><div class="titlepage"><div><div><h3 class="title">32.4.1. Inlining Support for Extensions</h3></div></div></div><p>
+    <span class="productname">PostgreSQL</span>'s <acronym class="acronym">JIT</acronym>
+    implementation can inline the bodies of functions
+    of types <code class="literal">C</code> and <code class="literal">internal</code>, as well as
+    operators based on such functions.  To do so for functions in extensions,
+    the definitions of those functions need to be made available.
+    When using <a class="link" href="extend-pgxs.html" title="38.18. Extension Building Infrastructure">PGXS</a> to build an extension
+    against a server that has been compiled with LLVM JIT support, the
+    relevant files will be built and installed automatically.
+   </p><p>
+    The relevant files have to be installed into
+    <code class="filename">$pkglibdir/bitcode/$extension/</code> and a summary of them
+    into <code class="filename">$pkglibdir/bitcode/$extension.index.bc</code>, where
+    <code class="literal">$pkglibdir</code> is the directory returned by
+    <code class="literal">pg_config --pkglibdir</code> and <code class="literal">$extension</code>
+    is the base name of the extension's shared library.
+
+    </p><div class="note"><h3 class="title">Note</h3><p>
+      For functions built into <span class="productname">PostgreSQL</span> itself,
+      the bitcode is installed into
+      <code class="literal">$pkglibdir/bitcode/postgres</code>.
+     </p></div><p>
+   </p></div><div class="sect2" id="JIT-PLUGGABLE"><div class="titlepage"><div><div><h3 class="title">32.4.2. Pluggable <acronym class="acronym">JIT</acronym> Providers</h3></div></div></div><p>
+    <span class="productname">PostgreSQL</span> provides a <acronym class="acronym">JIT</acronym>
+    implementation based on <span class="productname">LLVM</span>.  The interface to
+    the <acronym class="acronym">JIT</acronym> provider is pluggable and the provider can be
+    changed without recompiling (although currently, the build process only
+    provides inlining support data for <span class="productname">LLVM</span>).
+    The active provider is chosen via the setting
+    <a class="xref" href="runtime-config-client.html#GUC-JIT-PROVIDER">jit_provider</a>.
+   </p><div class="sect3" id="id-1.6.19.8.3.3"><div class="titlepage"><div><div><h4 class="title">32.4.2.1. <acronym class="acronym">JIT</acronym> Provider Interface</h4></div></div></div><p>
+     A <acronym class="acronym">JIT</acronym> provider is loaded by dynamically loading the
+     named shared library. The normal library search path is used to locate
+     the library. To provide the required <acronym class="acronym">JIT</acronym> provider
+     callbacks and to indicate that the library is actually a
+     <acronym class="acronym">JIT</acronym> provider, it needs to provide a C function named
+     <code class="function">_PG_jit_provider_init</code>. This function is passed a
+     struct that needs to be filled with the callback function pointers for
+     individual actions:
+</p><pre class="programlisting">
+struct JitProviderCallbacks
+{
+    JitProviderResetAfterErrorCB reset_after_error;
+    JitProviderReleaseContextCB release_context;
+    JitProviderCompileExprCB compile_expr;
+};
+
+extern void _PG_jit_provider_init(JitProviderCallbacks *cb);
+</pre><p>
+    </p></div></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="jit-configuration.html" title="32.3. Configuration">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="jit.html" title="Chapter 32. Just-in-Time Compilation (JIT)">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="regress.html" title="Chapter 33. Regression Tests">Next</a></td></tr><tr><td width="40%" align="left" valign="top">32.3. Configuration </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 15.5 Documentation">Home</a></td><td width="40%" align="right" valign="top"> Chapter 33. Regression Tests</td></tr></table></div></body></html>
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