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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `src/llvm/lljit.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>lljit.rs - source</title><link rel="stylesheet" type="text/css" href="../../../normalize.css"><link rel="stylesheet" type="text/css" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../../ayu.css" disabled ><script id="default-settings" ></script><script src="../../../storage.js"></script><script src="../../../crates.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../../../favicon.svg"><link rel="alternate icon" type="image/png" href="../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><style type="text/css">#crate-search{background-image:url("../../../down-arrow.svg");}</style></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu" role="button">☰</div><a href='../../../llvm_kaleidoscope_rs/index.html'><div class='logo-container rust-logo'><img src='../../../rust-logo.png' alt='logo'></div></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img width="18" height="18" alt="Pick another theme!" src="../../../brush.svg"></button><div id="theme-choices" role="menu"></div></div><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input"name="search" disabled autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" id="help-button" title="help">?</button><a id="settings-menu" href="../../../settings.html" title="settings"><img width="18" height="18" alt="Change settings" src="../../../wheel.svg"></a></div></form></nav><section id="main" class="content"><div class="example-wrap"><pre class="line-numbers"><span id="1"> 1</span>
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</pre><pre class="rust">
<span class="kw">use</span> <span class="ident">llvm_sys::orc2</span>::{
<span class="ident">lljit</span>::{
<span class="ident">LLVMOrcCreateLLJIT</span>, <span class="ident">LLVMOrcLLJITAddLLVMIRModuleWithRT</span>, <span class="ident">LLVMOrcLLJITGetGlobalPrefix</span>,
<span class="ident">LLVMOrcLLJITGetMainJITDylib</span>, <span class="ident">LLVMOrcLLJITLookup</span>, <span class="ident">LLVMOrcLLJITRef</span>,
},
<span class="ident">LLVMOrcCreateDynamicLibrarySearchGeneratorForProcess</span>, <span class="ident">LLVMOrcDefinitionGeneratorRef</span>,
<span class="ident">LLVMOrcJITDylibAddGenerator</span>, <span class="ident">LLVMOrcJITDylibCreateResourceTracker</span>, <span class="ident">LLVMOrcJITDylibRef</span>,
<span class="ident">LLVMOrcReleaseResourceTracker</span>, <span class="ident">LLVMOrcResourceTrackerRef</span>, <span class="ident">LLVMOrcResourceTrackerRemove</span>,
};
<span class="kw">use</span> <span class="ident">std::convert::TryFrom</span>;
<span class="kw">use</span> <span class="ident">std::marker::PhantomData</span>;
<span class="kw">use</span> <span class="kw">super</span>::{<span class="ident">Error</span>, <span class="ident">Module</span>};
<span class="kw">use</span> <span class="kw">crate</span><span class="ident">::SmallCStr</span>;
<span class="doccomment">/// Marker trait to constrain function signatures that can be looked up in the JIT.</span>
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">JitFn</span> {}
<span class="kw">impl</span> <span class="ident">JitFn</span> <span class="kw">for</span> <span class="kw">unsafe</span> <span class="kw">extern</span> <span class="string">"C"</span> <span class="kw">fn</span>() <span class="op">-</span><span class="op">></span> <span class="ident">f64</span> {}
<span class="doccomment">/// Wrapper for a LLVM [LLJIT](https://www.llvm.org/docs/ORCv2.html#lljit-and-lllazyjit).</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">LLJit</span> {
<span class="ident">jit</span>: <span class="ident">LLVMOrcLLJITRef</span>,
<span class="ident">dylib</span>: <span class="ident">LLVMOrcJITDylibRef</span>,
}
<span class="kw">impl</span> <span class="ident">LLJit</span> {
<span class="doccomment">/// Create a new LLJit instance.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if LLVM API returns a `null` pointer or an error.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-</span><span class="op">></span> <span class="ident">LLJit</span> {
<span class="kw">let</span> (<span class="ident">jit</span>, <span class="ident">dylib</span>) <span class="op">=</span> <span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">jit</span> <span class="op">=</span> <span class="ident">std::ptr::null_mut</span>();
<span class="kw">let</span> <span class="ident">err</span> <span class="op">=</span> <span class="ident">LLVMOrcCreateLLJIT</span>(
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">jit</span> <span class="kw">as</span> <span class="kw">_</span>,
<span class="ident">std::ptr::null_mut</span>(), <span class="comment">/* builder: nullptr -> default */</span>
);
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">err</span>) <span class="op">=</span> <span class="ident">Error::from</span>(<span class="ident">err</span>) {
<span class="macro">panic!</span>(<span class="string">"Error: {}"</span>, <span class="ident">err</span>.<span class="ident">as_str</span>());
}
<span class="kw">let</span> <span class="ident">dylib</span> <span class="op">=</span> <span class="ident">LLVMOrcLLJITGetMainJITDylib</span>(<span class="ident">jit</span>);
<span class="macro">assert!</span>(<span class="op">!</span><span class="ident">dylib</span>.<span class="ident">is_null</span>());
(<span class="ident">jit</span>, <span class="ident">dylib</span>)
};
<span class="ident">LLJit</span> { <span class="ident">jit</span>, <span class="ident">dylib</span> }
}
<span class="doccomment">/// Add an LLVM IR module to the JIT. Return a [`ResourceTracker`], which when dropped, will</span>
<span class="doccomment">/// remove the code of the LLVM IR module from the JIT.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if LLVM API returns a `null` pointer or an error.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">add_module</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">module</span>: <span class="ident">Module</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ResourceTracker</span><span class="op"><</span><span class="lifetime">'_</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">tsmod</span> <span class="op">=</span> <span class="ident">module</span>.<span class="ident">into_raw_thread_safe_module</span>();
<span class="kw">let</span> <span class="ident">rt</span> <span class="op">=</span> <span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">rt</span> <span class="op">=</span> <span class="ident">LLVMOrcJITDylibCreateResourceTracker</span>(<span class="self">self</span>.<span class="ident">dylib</span>);
<span class="kw">let</span> <span class="ident">err</span> <span class="op">=</span> <span class="ident">LLVMOrcLLJITAddLLVMIRModuleWithRT</span>(<span class="self">self</span>.<span class="ident">jit</span>, <span class="ident">rt</span>, <span class="ident">tsmod</span>);
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">err</span>) <span class="op">=</span> <span class="ident">Error::from</span>(<span class="ident">err</span>) {
<span class="macro">panic!</span>(<span class="string">"Error: {}"</span>, <span class="ident">err</span>.<span class="ident">as_str</span>());
}
<span class="ident">rt</span>
};
<span class="ident">ResourceTracker::new</span>(<span class="ident">rt</span>)
}
<span class="doccomment">/// Find the symbol with the name `sym` in the JIT.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if the symbol is not found in the JIT.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">find_symbol</span><span class="op"><</span><span class="ident">F</span>: <span class="ident">JitFn</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">sym</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-</span><span class="op">></span> <span class="ident">F</span> {
<span class="kw">let</span> <span class="ident">sym</span> <span class="op">=</span>
<span class="ident">SmallCStr::try_from</span>(<span class="ident">sym</span>).<span class="ident">expect</span>(<span class="string">"Failed to convert 'sym' argument to small C string!"</span>);
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">addr</span> <span class="op">=</span> <span class="number">0u64</span>;
<span class="kw">let</span> <span class="ident">err</span> <span class="op">=</span> <span class="ident">LLVMOrcLLJITLookup</span>(<span class="self">self</span>.<span class="ident">jit</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">addr</span> <span class="kw">as</span> <span class="kw">_</span>, <span class="ident">sym</span>.<span class="ident">as_ptr</span>());
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">err</span>) <span class="op">=</span> <span class="ident">Error::from</span>(<span class="ident">err</span>) {
<span class="macro">panic!</span>(<span class="string">"Error: {}"</span>, <span class="ident">err</span>.<span class="ident">as_str</span>());
}
<span class="macro">debug_assert_eq!</span>(<span class="ident">core::mem::size_of_val</span>(<span class="kw-2">&</span><span class="ident">addr</span>), <span class="ident">core::mem::size_of</span>::<span class="op"><</span><span class="ident">F</span><span class="op">></span>());
<span class="ident">std::mem::transmute_copy</span>(<span class="kw-2">&</span><span class="ident">addr</span>)
}
}
<span class="doccomment">/// Enable lookup of dynamic symbols available in the current process from the JIT.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if LLVM API returns an error.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">enable_process_symbols</span>(<span class="kw-2">&</span><span class="self">self</span>) {
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">proc_syms_gen</span>: <span class="ident">LLVMOrcDefinitionGeneratorRef</span> <span class="op">=</span> <span class="ident">std::ptr::null_mut</span>();
<span class="kw">let</span> <span class="ident">err</span> <span class="op">=</span> <span class="ident">LLVMOrcCreateDynamicLibrarySearchGeneratorForProcess</span>(
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">proc_syms_gen</span> <span class="kw">as</span> <span class="kw">_</span>,
<span class="self">self</span>.<span class="ident">global_prefix</span>(),
<span class="prelude-val">None</span>, <span class="comment">/* filter */</span>
<span class="ident">std::ptr::null_mut</span>(), <span class="comment">/* filter ctx */</span>
);
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">err</span>) <span class="op">=</span> <span class="ident">Error::from</span>(<span class="ident">err</span>) {
<span class="macro">panic!</span>(<span class="string">"Error: {}"</span>, <span class="ident">err</span>.<span class="ident">as_str</span>());
}
<span class="ident">LLVMOrcJITDylibAddGenerator</span>(<span class="self">self</span>.<span class="ident">dylib</span>, <span class="ident">proc_syms_gen</span>);
}
}
<span class="doccomment">/// Return the global prefix character according to the LLJITs data layout.</span>
<span class="kw">fn</span> <span class="ident">global_prefix</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">libc::c_char</span> {
<span class="kw">unsafe</span> { <span class="ident">LLVMOrcLLJITGetGlobalPrefix</span>(<span class="self">self</span>.<span class="ident">jit</span>) }
}
}
<span class="doccomment">/// A resource handle for code added to an [`LLJit`] instance.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// When a `ResourceTracker` handle is dropped, the code corresponding to the handle will be</span>
<span class="doccomment">/// removed from the JIT.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">ResourceTracker</span><span class="op"><</span><span class="lifetime">'jit</span><span class="op">></span>(<span class="ident">LLVMOrcResourceTrackerRef</span>, <span class="ident">PhantomData</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'jit</span> ()<span class="op">></span>);
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'jit</span><span class="op">></span> <span class="ident">ResourceTracker</span><span class="op"><</span><span class="lifetime">'jit</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">rt</span>: <span class="ident">LLVMOrcResourceTrackerRef</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ResourceTracker</span><span class="op"><</span><span class="lifetime">'jit</span><span class="op">></span> {
<span class="macro">assert!</span>(<span class="op">!</span><span class="ident">rt</span>.<span class="ident">is_null</span>());
<span class="ident">ResourceTracker</span>(<span class="ident">rt</span>, <span class="ident">PhantomData</span>)
}
}
<span class="kw">impl</span> <span class="ident">Drop</span> <span class="kw">for</span> <span class="ident">ResourceTracker</span><span class="op"><</span><span class="lifetime">'_</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">drop</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) {
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">err</span> <span class="op">=</span> <span class="ident">LLVMOrcResourceTrackerRemove</span>(<span class="self">self</span>.<span class="number">0</span>);
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">err</span>) <span class="op">=</span> <span class="ident">Error::from</span>(<span class="ident">err</span>) {
<span class="macro">panic!</span>(<span class="string">"Error: {}"</span>, <span class="ident">err</span>.<span class="ident">as_str</span>());
}
<span class="ident">LLVMOrcReleaseResourceTracker</span>(<span class="self">self</span>.<span class="number">0</span>);
};
}
}
</pre></div>
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