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</pre></div><pre class="rust"><code><span class="kw">use </span>llvm_sys::{
core::{
LLVMCreateFunctionPassManagerForModule, LLVMDisposePassManager,
LLVMInitializeFunctionPassManager, LLVMRunFunctionPassManager,
},
prelude::LLVMPassManagerRef,
transforms::{
instcombine::LLVMAddInstructionCombiningPass,
scalar::{LLVMAddCFGSimplificationPass, LLVMAddNewGVNPass, LLVMAddReassociatePass},
},
};
<span class="kw">use </span>std::marker::PhantomData;
<span class="kw">use super</span>::{FnValue, Module};
<span class="doccomment">/// Wrapper for a LLVM Function PassManager (legacy).
</span><span class="kw">pub struct </span>FunctionPassManager<<span class="lifetime">'llvm</span>> {
fpm: LLVMPassManagerRef,
_ctx: PhantomData<<span class="kw-2">&</span><span class="lifetime">'llvm </span>()>,
}
<span class="kw">impl</span><<span class="lifetime">'llvm</span>> FunctionPassManager<<span class="lifetime">'llvm</span>> {
<span class="doccomment">/// Create a new Function PassManager with the following optimization passes
/// - InstructionCombiningPass
/// - ReassociatePass
/// - NewGVNPass
/// - CFGSimplificationPass
///
/// The list of selected optimization passes is taken from the tutorial chapter [LLVM
/// Optimization Passes](https://llvm.org/docs/tutorial/MyFirstLanguageFrontend/LangImpl04.html#id3).
</span><span class="kw">pub fn </span>with_ctx(module: <span class="kw-2">&</span><span class="lifetime">'llvm </span>Module) -> FunctionPassManager<<span class="lifetime">'llvm</span>> {
<span class="kw">let </span>fpm = <span class="kw">unsafe </span>{
<span class="comment">// Borrows module reference.
</span>LLVMCreateFunctionPassManagerForModule(module.module())
};
<span class="macro">assert!</span>(!fpm.is_null());
<span class="kw">unsafe </span>{
<span class="comment">// Do simple "peephole" optimizations and bit-twiddling optzns.
</span>LLVMAddInstructionCombiningPass(fpm);
<span class="comment">// Reassociate expressions.
</span>LLVMAddReassociatePass(fpm);
<span class="comment">// Eliminate Common SubExpressions.
</span>LLVMAddNewGVNPass(fpm);
<span class="comment">// Simplify the control flow graph (deleting unreachable blocks, etc).
</span>LLVMAddCFGSimplificationPass(fpm);
<span class="kw">let </span>fail = LLVMInitializeFunctionPassManager(fpm);
<span class="macro">assert_eq!</span>(fail, <span class="number">0</span>);
}
FunctionPassManager {
fpm,
_ctx: PhantomData,
}
}
<span class="doccomment">/// Run the optimization passes registered with the Function PassManager on the function
/// referenced by `fn_value`.
</span><span class="kw">pub fn </span>run(<span class="kw-2">&</span><span class="lifetime">'llvm </span><span class="self">self</span>, fn_value: FnValue<<span class="lifetime">'llvm</span>>) {
<span class="kw">unsafe </span>{
<span class="comment">// Returns 1 if any of the passes modified the function, false otherwise.
</span>LLVMRunFunctionPassManager(<span class="self">self</span>.fpm, fn_value.value_ref());
}
}
}
<span class="kw">impl </span>Drop <span class="kw">for </span>FunctionPassManager<<span class="lifetime">'_</span>> {
<span class="kw">fn </span>drop(<span class="kw-2">&mut </span><span class="self">self</span>) {
<span class="kw">unsafe </span>{
LLVMDisposePassManager(<span class="self">self</span>.fpm);
}
}
}
</code></pre></div></section></main></body></html>
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