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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`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>pass_manager.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../normalize.css"><link rel="stylesheet" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../ayu.css" disabled><link rel="stylesheet" href="../../../dark.css" disabled><link rel="stylesheet" href="../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../storage.js"></script><script defer src="../../../source-script.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../main.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../favicon.svg"></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="mobile-topbar"><button class="sidebar-menu-toggle">☰</button><a class="sidebar-logo" href="../../../llvm_kaleidoscope_rs/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a><h2 class="location"></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../../../llvm_kaleidoscope_rs/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../../../llvm_kaleidoscope_rs/index.html"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></a><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><button type="button">?</button></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../wheel.svg"></a></div></div></form></nav></div><section id="main-content" class="content"><div class="example-wrap"><pre class="line-numbers"><span id="1">1</span>
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</pre><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>
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