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</pre><pre class="rust"><code><span class="kw">use</span> <span class="ident">llvm_sys</span>::{
<span class="ident">core</span>::{
<span class="ident">LLVMAddFunction</span>, <span class="ident">LLVMAppendBasicBlockInContext</span>, <span class="ident">LLVMCreateBasicBlockInContext</span>,
<span class="ident">LLVMDisposeModule</span>, <span class="ident">LLVMDoubleTypeInContext</span>, <span class="ident">LLVMDumpModule</span>, <span class="ident">LLVMGetNamedFunction</span>,
<span class="ident">LLVMModuleCreateWithNameInContext</span>,
},
<span class="ident">orc2</span>::{
<span class="ident">LLVMOrcCreateNewThreadSafeContext</span>, <span class="ident">LLVMOrcCreateNewThreadSafeModule</span>,
<span class="ident">LLVMOrcDisposeThreadSafeContext</span>, <span class="ident">LLVMOrcThreadSafeContextGetContext</span>,
<span class="ident">LLVMOrcThreadSafeContextRef</span>, <span class="ident">LLVMOrcThreadSafeModuleRef</span>,
},
<span class="ident">prelude</span>::{<span class="ident">LLVMBool</span>, <span class="ident">LLVMContextRef</span>, <span class="ident">LLVMModuleRef</span>, <span class="ident">LLVMTypeRef</span>},
<span class="ident">LLVMTypeKind</span>,
};
<span class="kw">use</span> <span class="ident">std::convert::TryFrom</span>;
<span class="kw">use</span> <span class="kw">super</span>::{<span class="ident">BasicBlock</span>, <span class="ident">FnValue</span>, <span class="ident">Type</span>};
<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::SmallCStr</span>;
<span class="comment">// Definition of LLVM C API functions using our `repr(transparent)` types.</span>
<span class="kw">extern</span> <span class="string">"C"</span> {
<span class="kw">fn</span> <span class="ident">LLVMFunctionType</span>(
<span class="ident">ReturnType</span>: <span class="ident">Type</span><span class="op"><</span><span class="lifetime">'_</span><span class="op">></span>,
<span class="ident">ParamTypes</span>: <span class="kw-2">*mut</span> <span class="ident">Type</span><span class="op"><</span><span class="lifetime">'_</span><span class="op">></span>,
<span class="ident">ParamCount</span>: <span class="ident">::libc::c_uint</span>,
<span class="ident">IsVarArg</span>: <span class="ident">LLVMBool</span>,
) -> <span class="ident">LLVMTypeRef</span>;
}
<span class="doccomment">/// Wrapper for a LLVM Module with its own LLVM Context.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Module</span> {
<span class="ident">tsctx</span>: <span class="ident">LLVMOrcThreadSafeContextRef</span>,
<span class="ident">ctx</span>: <span class="ident">LLVMContextRef</span>,
<span class="ident">module</span>: <span class="ident">LLVMModuleRef</span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'llvm</span><span class="op">></span> <span class="ident">Module</span> {
<span class="doccomment">/// Create a new Module instance.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if creating the context or the module fails.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>() -> <span class="self">Self</span> {
<span class="kw">let</span> (<span class="ident">tsctx</span>, <span class="ident">ctx</span>, <span class="ident">module</span>) <span class="op">=</span> <span class="kw">unsafe</span> {
<span class="comment">// We generate a thread safe context because we are going to jit this IR module and</span>
<span class="comment">// there is no method to create a thread safe context wrapper from an existing context</span>
<span class="comment">// reference (at the time of writing this).</span>
<span class="comment">//</span>
<span class="comment">// ThreadSafeContext has shared ownership (start with ref count 1).</span>
<span class="comment">// We must explicitly dispose our reference (dec ref count).</span>
<span class="kw">let</span> <span class="ident">tc</span> <span class="op">=</span> <span class="ident">LLVMOrcCreateNewThreadSafeContext</span>();
<span class="macro">assert!</span>(<span class="op">!</span><span class="ident">tc</span>.<span class="ident">is_null</span>());
<span class="kw">let</span> <span class="ident">c</span> <span class="op">=</span> <span class="ident">LLVMOrcThreadSafeContextGetContext</span>(<span class="ident">tc</span>);
<span class="kw">let</span> <span class="ident">m</span> <span class="op">=</span> <span class="ident">LLVMModuleCreateWithNameInContext</span>(<span class="string">b"module\0"</span>.<span class="ident">as_ptr</span>().<span class="ident">cast</span>(), <span class="ident">c</span>);
<span class="macro">assert!</span>(<span class="op">!</span><span class="ident">c</span>.<span class="ident">is_null</span>() <span class="op">&&</span> <span class="op">!</span><span class="ident">m</span>.<span class="ident">is_null</span>());
(<span class="ident">tc</span>, <span class="ident">c</span>, <span class="ident">m</span>)
};
<span class="ident">Module</span> { <span class="ident">tsctx</span>, <span class="ident">ctx</span>, <span class="ident">module</span> }
}
<span class="doccomment">/// Get the raw LLVM context reference.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn</span> <span class="ident">ctx</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">LLVMContextRef</span> {
<span class="self">self</span>.<span class="ident">ctx</span>
}
<span class="doccomment">/// Get the raw LLVM module reference.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn</span> <span class="ident">module</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">LLVMModuleRef</span> {
<span class="self">self</span>.<span class="ident">module</span>
}
<span class="doccomment">/// Consume the module and turn in into a raw LLVM ThreadSafeModule reference.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If ownership of the raw reference is not transferred (eg to the JIT), memory will be leaked</span>
<span class="doccomment">/// in case the reference is disposed explicitly with LLVMOrcDisposeThreadSafeModule.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn</span> <span class="ident">into_raw_thread_safe_module</span>(<span class="kw-2">mut</span> <span class="self">self</span>) -> <span class="ident">LLVMOrcThreadSafeModuleRef</span> {
<span class="kw">let</span> <span class="ident">m</span> <span class="op">=</span> <span class="ident">std::mem::replace</span>(<span class="kw-2">&mut</span> <span class="self">self</span>.<span class="ident">module</span>, <span class="ident">std::ptr::null_mut</span>());
<span class="comment">// ThreadSafeModule has unique ownership.</span>
<span class="comment">// Takes ownership of module and increments ThreadSafeContext ref count.</span>
<span class="comment">//</span>
<span class="comment">// We must not reference/dispose `m` after this call, but we need to dispose our `tsctx`</span>
<span class="comment">// reference.</span>
<span class="kw">let</span> <span class="ident">tm</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">LLVMOrcCreateNewThreadSafeModule</span>(<span class="ident">m</span>, <span class="self">self</span>.<span class="ident">tsctx</span>) };
<span class="macro">assert!</span>(<span class="op">!</span><span class="ident">tm</span>.<span class="ident">is_null</span>());
<span class="ident">tm</span>
}
<span class="doccomment">/// Dump LLVM IR emitted into the Module to stdout.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">dump</span>(<span class="kw-2">&</span><span class="self">self</span>) {
<span class="kw">unsafe</span> { <span class="ident">LLVMDumpModule</span>(<span class="self">self</span>.<span class="ident">module</span>) };
}
<span class="doccomment">/// Get a type reference representing a `f64` float.</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.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">type_f64</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">Type</span><span class="op"><</span><span class="lifetime">'llvm</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">type_ref</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">LLVMDoubleTypeInContext</span>(<span class="self">self</span>.<span class="ident">ctx</span>) };
<span class="ident">Type::new</span>(<span class="ident">type_ref</span>)
}
<span class="doccomment">/// Get a type reference representing a `fn(args) -> ret` function.</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.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">type_fn</span>(<span class="kw-2">&</span><span class="lifetime">'llvm</span> <span class="self">self</span>, <span class="ident">args</span>: <span class="kw-2">&mut</span> [<span class="ident">Type</span><span class="op"><</span><span class="lifetime">'llvm</span><span class="op">></span>], <span class="ident">ret</span>: <span class="ident">Type</span><span class="op"><</span><span class="lifetime">'llvm</span><span class="op">></span>) -> <span class="ident">Type</span><span class="op"><</span><span class="lifetime">'llvm</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">type_ref</span> <span class="op">=</span> <span class="kw">unsafe</span> {
<span class="ident">LLVMFunctionType</span>(
<span class="ident">ret</span>,
<span class="ident">args</span>.<span class="ident">as_mut_ptr</span>(),
<span class="ident">args</span>.<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">libc::c_uint</span>,
<span class="number">0</span>, <span class="comment">/* IsVarArg */</span>
)
};
<span class="ident">Type::new</span>(<span class="ident">type_ref</span>)
}
<span class="doccomment">/// Add a function with the given `name` and `fn_type` to the module and return a value</span>
<span class="doccomment">/// reference representing the function.</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 `name` could not be converted to a</span>
<span class="doccomment">/// [`SmallCStr`].</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">add_fn</span>(<span class="kw-2">&</span><span class="lifetime">'llvm</span> <span class="self">self</span>, <span class="ident">name</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">fn_type</span>: <span class="ident">Type</span><span class="op"><</span><span class="lifetime">'llvm</span><span class="op">></span>) -> <span class="ident">FnValue</span><span class="op"><</span><span class="lifetime">'llvm</span><span class="op">></span> {
<span class="macro">debug_assert_eq!</span>(
<span class="ident">fn_type</span>.<span class="ident">kind</span>(),
<span class="ident">LLVMTypeKind::LLVMFunctionTypeKind</span>,
<span class="string">"Expected a function type when adding a function!"</span>
);
<span class="kw">let</span> <span class="ident">name</span> <span class="op">=</span> <span class="ident">SmallCStr::try_from</span>(<span class="ident">name</span>)
.<span class="ident">expect</span>(<span class="string">"Failed to convert 'name' argument to small C string!"</span>);
<span class="kw">let</span> <span class="ident">value_ref</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">LLVMAddFunction</span>(<span class="self">self</span>.<span class="ident">module</span>, <span class="ident">name</span>.<span class="ident">as_ptr</span>(), <span class="ident">fn_type</span>.<span class="ident">type_ref</span>()) };
<span class="ident">FnValue::new</span>(<span class="ident">value_ref</span>)
}
<span class="doccomment">/// Get a function value reference to the function with the given `name` if it was previously</span>
<span class="doccomment">/// added to the module with [`add_fn`][Module::add_fn].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if `name` could not be converted to a [`SmallCStr`].</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_fn</span>(<span class="kw-2">&</span><span class="lifetime">'llvm</span> <span class="self">self</span>, <span class="ident">name</span>: <span class="kw-2">&</span><span class="ident">str</span>) -> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">FnValue</span><span class="op"><</span><span class="lifetime">'llvm</span><span class="op">></span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">name</span> <span class="op">=</span> <span class="ident">SmallCStr::try_from</span>(<span class="ident">name</span>)
.<span class="ident">expect</span>(<span class="string">"Failed to convert 'name' argument to small C string!"</span>);
<span class="kw">let</span> <span class="ident">value_ref</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">LLVMGetNamedFunction</span>(<span class="self">self</span>.<span class="ident">module</span>, <span class="ident">name</span>.<span class="ident">as_ptr</span>()) };
(<span class="op">!</span><span class="ident">value_ref</span>.<span class="ident">is_null</span>()).<span class="ident">then</span>(<span class="op">|</span><span class="op">|</span> <span class="ident">FnValue::new</span>(<span class="ident">value_ref</span>))
}
<span class="doccomment">/// Append a Basic Block to the end of the function referenced by the value reference</span>
<span class="doccomment">/// `fn_value`.</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.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">append_basic_block</span>(<span class="kw-2">&</span><span class="lifetime">'llvm</span> <span class="self">self</span>, <span class="ident">fn_value</span>: <span class="ident">FnValue</span><span class="op"><</span><span class="lifetime">'llvm</span><span class="op">></span>) -> <span class="ident">BasicBlock</span><span class="op"><</span><span class="lifetime">'llvm</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">block</span> <span class="op">=</span> <span class="kw">unsafe</span> {
<span class="ident">LLVMAppendBasicBlockInContext</span>(
<span class="self">self</span>.<span class="ident">ctx</span>,
<span class="ident">fn_value</span>.<span class="ident">value_ref</span>(),
<span class="string">b"block\0"</span>.<span class="ident">as_ptr</span>().<span class="ident">cast</span>(),
)
};
<span class="macro">assert!</span>(<span class="op">!</span><span class="ident">block</span>.<span class="ident">is_null</span>());
<span class="ident">BasicBlock::new</span>(<span class="ident">block</span>)
}
<span class="doccomment">/// Create a free-standing Basic Block without adding it to a function.</span>
<span class="doccomment">/// This can be added to a function at a later point in time with</span>
<span class="doccomment">/// [`FnValue::append_basic_block`].</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.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">create_basic_block</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">BasicBlock</span><span class="op"><</span><span class="lifetime">'llvm</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">block</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">LLVMCreateBasicBlockInContext</span>(<span class="self">self</span>.<span class="ident">ctx</span>, <span class="string">b"block\0"</span>.<span class="ident">as_ptr</span>().<span class="ident">cast</span>()) };
<span class="macro">assert!</span>(<span class="op">!</span><span class="ident">block</span>.<span class="ident">is_null</span>());
<span class="ident">BasicBlock::new</span>(<span class="ident">block</span>)
}
}
<span class="kw">impl</span> <span class="ident">Drop</span> <span class="kw">for</span> <span class="ident">Module</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="comment">// In case we turned the module into a ThreadSafeModule, we must not dispose the module</span>
<span class="comment">// reference because ThreadSafeModule took ownership!</span>
<span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">module</span>.<span class="ident">is_null</span>() {
<span class="ident">LLVMDisposeModule</span>(<span class="self">self</span>.<span class="ident">module</span>);
}
<span class="comment">// Dispose ThreadSafeContext reference (dec ref count) in any case.</span>
<span class="ident">LLVMOrcDisposeThreadSafeContext</span>(<span class="self">self</span>.<span class="ident">tsctx</span>);
}
}
}
</code></pre></div>
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