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</pre><pre class="rust"><code><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="ident"><span class="kw">crate</span>::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="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="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">&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="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="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">&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">&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="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="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">&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>);
};
}
}
</code></pre></div>
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