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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/pass_manager.rs`."><title>pass_manager.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../../static.files/rustdoc-17e279919966e8e4.css"><meta name="rustdoc-vars" data-root-path="../../../" data-static-root-path="../../../static.files/" data-current-crate="llvm_kaleidoscope_rs" data-themes="" data-resource-suffix="" data-rustdoc-version="1.75.0 (82e1608df 2023-12-21) (built from a source tarball)" data-channel="1.75.0" data-search-js="search-8fbf244ebcf71464.js" data-settings-js="settings-74424d7eec62a23e.js" ><script src="../../../static.files/storage-fec3eaa3851e447d.js"></script><script defer src="../../../static.files/src-script-3280b574d94e47b4.js"></script><script defer src="../../../src-files.js"></script><script defer src="../../../static.files/main-9dd44ab47b99a0fb.js"></script><noscript><link rel="stylesheet" href="../../../static.files/noscript-5d8b3c7633ad77ba.css"></noscript><link rel="alternate icon" type="image/png" href="../../../static.files/favicon-16x16-8b506e7a72182f1c.png"><link rel="alternate icon" type="image/png" href="../../../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../../../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc src"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"></nav><main><nav class="sub"><form class="search-form"><span></span><input class="search-input" name="search" aria-label="Run search in the documentation" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><div data-nosnippet><pre class="src-line-numbers"><a href="#1" id="1">1</a>
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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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