<!DOCTYPE html><htmllang="en"><head><metacharset="utf-8"><metaname="viewport"content="width=device-width, initial-scale=1.0"><metaname="generator"content="rustdoc"><metaname="description"content="API documentation for the Rust `DominatorTreePreorder` struct in crate `cranelift_codegen`."><metaname="keywords"content="rust, rustlang, rust-lang, DominatorTreePreorder"><title>cranelift_codegen::dominator_tree::DominatorTreePreorder - Rust</title><linkrel="stylesheet"type="text/css"href="../../normalize.css"><linkrel="stylesheet"type="text/css"href="../../rustdoc.css"id="mainThemeStyle"><linkrel="stylesheet"type="text/css"href="../../dark.css"><linkrel="stylesheet"type="text/css"href="../../light.css"id="themeStyle"><scriptsrc="../../storage.js"></script><noscript><linkrel="stylesheet"href="../../noscript.css"></noscript><linkrel="shortcut icon"href="../../favicon.ico"><styletype="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></head><bodyclass="rustdoc struct"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><navclass="sidebar"><divclass="sidebar-menu">☰</div><ahref='../../cranelift_codegen/index.html'><divclass='logo-container'><imgsrc='../../rust-logo.png'alt='logo'></div></a><pclass='location'>Struct DominatorTreePreorder</p><divclass="sidebar-elems"><divclass="block items"><aclass="sidebar-title"href="#methods">Methods</a><divclass="sidebar-links"><ahref="#method.children">children</a><ahref="#method.compute">compute</a><ahref="#method.dominates">dominates</a><ahref="#method.new">new</a><ahref="#method.pre_cmp">pre_cmp</a><ahref="#method.pre_cmp_def">pre_cmp_def</a><ahref="#method.pre_cmp_ebb">pre_cmp_ebb</a></div><aclass="sidebar-title"href="#synthetic-implementations">Auto Trait Implementations</a><divclass="sidebar-links"><ahref="#impl-RefUnwindSafe">RefUnwindSafe</a><ahref="#impl-Send">Send</a><ahref="#impl-Sync">Sync</a><ahref="#impl-Unpin">Unpin</a><ahref="#impl-UnwindSafe">UnwindSafe</a></div><aclass="sidebar-title"href="#blanket-implementations">Blanket Implementations</a><divclass="sidebar-links"><ahref="#impl-Any">Any</a><ahref="#impl-Borrow%3CT%3E">Borrow<T></a><ahref="#impl-BorrowMut%3CT%3E">BorrowMut<T></a><ahref="#impl-From%3CT%3E">From<T></a><ahref="#impl-Into%3CU%3E">Into<U></a><ahref="#impl-TryFrom%3CU%3E">TryFrom<U></a><ahref="#impl-TryInto%3CU%3E">TryInto<U></a></div></div><pclass='location'><ahref='../index.html'>cranelift_codegen</a>::<wbr><ahref='index.html'>dominator_tree</a></p><script>window.sidebarCurrent={name:'DominatorTreePreorder',ty:'struct',relpath:''};</script><scriptdefersrc="sidebar-items.js"></script></div></nav><divclass="theme-picker"><buttonid="theme-picker"aria-label="Pick another theme!"><imgsrc="../../brush.svg"width="18"alt="Pick another theme!"></button><divid="theme-choices"></div></div><scriptsrc="../../theme.js"></script><navclass="sub"><formclass="search-form js-only"><divclass="search-container"><div><selectid="crate-search"><optionvalue="All crates">All crates</option></select><inputclass="search-input"name="search"autocomplete="off"spellcheck="false"placeholder="Click or press ‘S’ to search, ‘?’ for more options…"type="search"></div><aid="settings-menu"href="../../settings.html"><imgsrc="../../wheel.svg"width="18"alt="Change settings"></a></div></form></nav><sectionid="main"class="content"><h1class='fqn'><spanclass='out-of-band'><spanid='render-detail'><aid="toggle-all-docs"href="javascript:void(0)"title="collapse all docs">[<spanclass='inner'>−</span>]</a></span><aclass='srclink'href='../../src/cranelift_codegen/dominator_tree.rs.html#510-515'title='goto source code'>[src]</a></span><spanclass='in-band'>Struct <ahref='../index.html'>cranelift_codegen</a>::<wbr><ahref='index.html'>dominator_tree</a>::<wbr><aclass="struct"href=''>DominatorTreePreorder</a></span></h1><divclass="docbl
<p>This data structure is computed from a <code>DominatorTree</code> and provides:</p>
<ul>
<li>A forward traversable dominator tree through the <code>children()</code> iterator.</li>
<li>An ordering of EBBs according to a dominator tree pre-order.</li>
<li>Constant time dominance checks at the EBB granularity.</li>
</ul>
<p>The information in this auxiliary data structure is not easy to update when the control flow
graph changes, which is why it is kept separate.</p>
</div><h2id='methods'class='small-section-header'>Methods<ahref='#methods'class='anchor'></a></h2><h3id='impl'class='impl'><codeclass='in-band'>impl <aclass="struct"href="../../cranelift_codegen/dominator_tree/struct.DominatorTreePreorder.html"title="struct cranelift_codegen::dominator_tree::DominatorTreePreorder">DominatorTreePreorder</a></code><ahref='#impl'class='anchor'></a><aclass='srclink'href='../../src/cranelift_codegen/dominator_tree.rs.html#535-591'title='goto source code'>[src]</a></h3><divclass='docblock'><p>Creating and computing the dominator tree pre-order.</p>
</div><divclass='impl-items'><h4id='method.new'class="method"><codeid='new.v'>pub fn <ahref='#method.new'class='fnname'>new</a>() -> Self</code><aclass='srclink'href='../../src/cranelift_codegen/dominator_tree.rs.html#537-542'title='goto source code'>[src]</a></h4><divclass='docblock'><p>Create a new blank <code>DominatorTreePreorder</code>.</p>
</div><h4id='method.compute'class="method"><codeid='compute.v'>pub fn <ahref='#method.compute'class='fnname'>compute</a>(&mut self, domtree: &<aclass="struct"href="../../cranelift_codegen/dominator_tree/struct.DominatorTree.html"title="struct cranelift_codegen::dominator_tree::DominatorTree">DominatorTree</a>, layout: &<aclass="struct"href="../../cranelift_codegen/ir/layout/struct.Layout.html"title="struct cranelift_codegen::ir::layout::Layout">Layout</a>)</code><aclass='srclink'href='../../src/cranelift_codegen/dominator_tree.rs.html#545-590'title='goto source code'>[src]</a></h4><divclass='docblock'><p>Recompute this data structure to match <code>domtree</code>.</p>
</div></div><h3id='impl-1'class='impl'><codeclass='in-band'>impl <aclass="struct"href="../../cranelift_codegen/dominator_tree/struct.DominatorTreePreorder.html"title="struct cranelift_codegen::dominator_tree::DominatorTreePreorder">DominatorTreePreorder</a></code><ahref='#impl-1'class='anchor'></a><aclass='srclink'href='../../src/cranelift_codegen/dominator_tree.rs.html#612-669'title='goto source code'>[src]</a></h3><divclass='docblock'><p>Query interface for the dominator tree pre-order.</p>
</div><divclass='impl-items'><h4id='method.children'class="method"><divclass="important-traits"><divclass='tooltip'>ⓘ<spanclass='tooltiptext'>Important traits for <aclass="struct"href="../../cranelift_codegen/dominator_tree/struct.ChildIter.html"title="struct cranelift_codegen::dominator_tree::ChildIter">ChildIter</a><'a></span></div><divclass="content hidden"><h3class="important">Important traits for <aclass="struct"href="../../cranelift_codegen/dominator_tree/struct.ChildIter.html"title="struct cranelift_codegen::dominator_tree::ChildIter">ChildIter</a><'a></h3><codeclass="content"><spanclass="where fmt-newline">impl<'a><aclass="trait"href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html"title="trait core::iter::traits::iterator::Iterator">Iterator</a> for <aclass="struct"href="../../cranelift_codegen/dominator_tree/struct.ChildIter.html"title="struct cranelift_codegen::dominator_tree::ChildIter">ChildIter</a><'a></span><spanclass="where fmt-newline"> type <ahref='https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item'class="type">Item</a> = <aclass="struct"href="../../cranelift_codegen/ir/entities/struct.Ebb.html"title="struct cranelift_codegen::ir::entities::Ebb">Ebb</a>;</span></code></div></div><codeid='children.v'>pub fn <ahref='#method.children'class='fnname'>children</a>(&self, ebb: <aclass="struct"href="../../cranelift_codegen/ir/entities/struct.Ebb.html"title="struct cranelift_codegen::ir::entities::Ebb">Ebb</a>) -><aclass="struct"href="../../cranelift_codegen/dominator_tree/struct.ChildIter.html"title="struct cranelift_codegen::dominator_tree::ChildIter">ChildIter</a></code><aclass='srclink'href='../../src/cranelift_codegen/dominator_tree.rs.html#617-622'title='goto source code'>[src]</a></h4><divclass='docblock'><p>Get an iterator over the direct children of <code>ebb</code> in the dominator tree.</p>
<p>These are the EBB's whose immediate dominator is an instruction in <code>ebb</code>, ordered according
to the CFG reverse post-order.</p>
</div><h4id='method.dominates'class="method"><codeid='dominates.v'>pub fn <ahref='#method.dominates'class='fnname'>dominates</a>(&self, a: <aclass="struct"href="../../cranelift_codegen/ir/entities/struct.Ebb.html"title="struct cranelift_codegen::ir::entities::Ebb">Ebb</a>, b: <aclass="struct"href="../../cranelift_codegen/ir/entities/struct.Ebb.html"title="struct cranelift_codegen::ir::entities::Ebb">Ebb</a>) -><aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code><aclass='srclink'href='../../src/cranelift_codegen/dominator_tree.rs.html#631-635'title='goto source code'>[src]</a></h4><divclass='docblock'><p>Fast, constant time dominance check with EBB granularity.</p>
<p>This computes the same result as <code>domtree.dominates(a, b)</code>, but in guaranteed fast constant
time. This is less general than the <code>DominatorTree</code> method because it only works with EBB
program points.</p>
<p>An EBB is considered to dominate itself.</p>
</div><h4id='method.pre_cmp_ebb'class="method"><codeid='pre_cmp_ebb.v'>pub fn <ahref='#method.pre_cmp_ebb'class='fnname'>pre_cmp_ebb</a>(&self, a: <aclass="struct"href="../../cranelift_codegen/ir/entities/struct.Ebb.html"title="struct cranelift_codegen::ir::entities::Ebb">Ebb</a>, b: <aclass="struct"href="../../cranelift_codegen/ir/entities/struct.Ebb.html"title="struct cranelift_codegen::ir::entities::Ebb">Ebb</a>) -><aclass="enum"href="https://doc.rust-lang.org/nightly/core/cmp/enum.Ordering.html"title="enum core::cmp::Ordering">Ordering</a></code><aclass='srclink'href='../../src/cranelift_codegen/dominator_tree.rs.html#638-640'title='goto source code'>[src]</a></h4><divclass='docblock'><p>Compare two EBBs according to the dominator pre-order.</p>
</div><h4id='method.pre_cmp'class="method"><codeid='pre_cmp.v'>pub fn <ahref='#method.pre_cmp'class='fnname'>pre_cmp</a><A, B>(&self, a: A, b: B, layout: &<aclass="struct"href="../../cranelift_codegen/ir/layout/struct.Layout.html"title="struct cranelift_codegen::ir::layout::Layout">Layout</a>) -><aclass="enum"href="https://doc.rust-lang.org/nightly/core/cmp/enum.Ordering.html"title="enum core::cmp::Ordering">Ordering</a><spanclass="where fmt-newline">where<br> A: <aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html"title="trait core::convert::Into">Into</a><<aclass="enum"href="../../cranelift_codegen/ir/enum.ExpandedProgramPoint.html"title="enum cranelift_codegen::ir::ExpandedProgramPoint">ExpandedProgramPoint</a>>,<br> B: <aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html"title="trait core::convert::Into">Into</a><<aclass="enum"href="../../cranelift_codegen/ir/enum.ExpandedProgramPoint.html"title="enum cranelift_codegen::ir::ExpandedProgramPoint">ExpandedProgramPoint</a>>, </span></code><aclass='srclink'href='../../src/cranelift_codegen/dominator_tree.rs.html#646-655'title='goto source code'>[src]</a></h4><divclass='docblock'><p>Compare two program points according to the dominator tree pre-order.</p>
<p>This ordering of program points have the property that given a program point, pp, all the
program points dominated by pp follow immediately and contiguously after pp in the order.</p>
</div><h4id='method.pre_cmp_def'class="method"><codeid='pre_cmp_def.v'>pub fn <ahref='#method.pre_cmp_def'class='fnname'>pre_cmp_def</a>(&self, a: <aclass="struct"href="../../cranelift_codegen/ir/entities/struct.Value.html"title="struct cranelift_codegen::ir::entities::Value">Value</a>, b: <aclass="struct"href="../../cranelift_codegen/ir/entities/struct.Value.html"title="struct cranelift_codegen::ir::entities::Value">Value</a>, func: &<aclass="struct"href="../../cranelift_codegen/ir/function/struct.Function.html"title="struct cranelift_codegen::ir::function::Function">Function</a>) -><aclass="enum"href="https://doc.rust-lang.org/nightly/core/cmp/enum.Ordering.html"title="enum core::cmp::Ordering">Ordering</a></code><aclass='srclink'href='../../src/cranelift_codegen/dominator_tree.rs.html#663-668'title='goto source code'>[src]</a></h4><divclass='docblock'><p>Compare two value defs according to the dominator tree pre-order.</p>
<p>Two values defined at the same program point are compared according to their parameter or
result order.</p>
<p>This is a total ordering of the values in the function.</p>
</div></div><h3id='impl-TryFrom%3CU%3E'class='impl'><codeclass='in-band'>impl<T, U><aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><U> for T <spanclass="where fmt-newline">where<br> U: <aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html"title="trait core::convert::Into">Into</a><T>, </span></code><ahref='#impl-TryFrom%3CU%3E'class='anchor'></a><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/convert.rs.html#571-577'title='goto source code'>[src]</a></h3><divclass='impl-items'><h4id='associatedtype.Error'class="type"><codeid='Error.t'>type <ahref='https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error'class="type">Error</a> = <aclass="enum"href="https://doc.rust-lang.org/nightly/core/convert/enum.Infallible.html"title="enum core::convert::Infallible">Infallible</a></code></h4><divclass='docblock'><p>The type returned in the event of a conversion error.</p>
</div><h4id='method.try_from'class="method hidden"><codeid='try_from.v'>fn <ahref='https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#tymethod.try_from'class='fnname'>try_from</a>(value: U) -><aclass="enum"href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html"title="enum core::result::Result">Result</a><T, <T as <aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><U>>::<aclass="type"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error"title="type core::convert::TryFrom::Error">Error</a>></code><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/convert.rs.html#574-576'title='goto source code'>[src]</a></h4><divclass='docblock hidden'><p>Performs the conversion.</p>
</div></div><h3id='impl-Into%3CU%3E'class='impl'><codeclass='in-band'>impl<T, U><aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html"title="trait core::convert::Into">Into</a><U> for T <spanclass="where fmt-newline">where<br> U: <aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html"title="trait core::convert::From">From</a><T>, </span></code><ahref='#impl-Into%3CU%3E'class='anchor'></a><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/convert.rs.html#543-548'title='goto source code'>[src]</a></h3><divclass='impl-items'><h4id='method.into'class="method hidden"><codeid='into.v'>fn <ahref='https://doc.rust-lang.org/nightly/core/convert/trait.Into.html#tymethod.into'class='fnname'>into</a>(self) -> U</code><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/convert.rs.html#545-547'title='goto source code'>[src]</a></h4><divclass='docblock hidden'><p>Performs the conversion.</p>
</div></div><h3id='impl-TryInto%3CU%3E'class='impl'><codeclass='in-band'>impl<T, U><aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html"title="trait core::convert::TryInto">TryInto</a><U> for T <spanclass="where fmt-newline">where<br> U: <aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><T>, </span></code><ahref='#impl-TryInto%3CU%3E'class='anchor'></a><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/convert.rs.html#559-566'title='goto source code'>[src]</a></h3><divclass='impl-items'><h4id='associatedtype.Error-1'class="type"><codeid='Error.t-1'>type <ahref='https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html#associatedtype.Error'class="type">Error</a> = <U as <aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><T>>::<aclass="type"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error"title="type core::convert::TryFrom::Error">Error</a></code></h4><divclass='docblock'><p>The type returned in the event of a conversion error.</p>
</div><h4id='method.try_into'class="method hidden"><codeid='try_into.v'>fn <ahref='https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html#tymethod.try_into'class='fnname'>try_into</a>(self) -><aclass="enum"href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html"title="enum core::result::Result">Result</a><U, <U as <aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><T>>::<aclass="type"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error"title="type core::convert::TryFrom::Error">Error</a>></code><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/convert.rs.html#563-565'title='goto source code'>[src]</a></h4><divclass='docblock hidden'><p>Performs the conversion.</p>
</div></div><h3id='impl-Borrow%3CT%3E'class='impl'><codeclass='in-band'>impl<T><aclass="trait"href="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html"title="trait core::borrow::Borrow">Borrow</a><T> for T <spanclass="where fmt-newline">where<br> T: ?<aclass="trait"href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html"title="trait core::marker::Sized">Sized</a>, </span></code><ahref='#impl-Borrow%3CT%3E'class='anchor'></a><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#213-215'title='goto source code'>[src]</a></h3><divclass='impl-items'><h4id='method.borrow'class="method hidden"><codeid='borrow.v'>fn <ahref='https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html#tymethod.borrow'class='fnname'>borrow</a>(&self) -><aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>T</code><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#214'title='goto source code'>[src]</a></h4><divclass='docblock hidden'><p>Immutably borrows from an owned value. <ahref="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html#tymethod.borrow">Read more</a></p>
</div></div><h3id='impl-BorrowMut%3CT%3E'class='impl'><codeclass='in-band'>impl<T><aclass="trait"href="https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html"title="trait core::borrow::BorrowMut">BorrowMut</a><T> for T <spanclass="where fmt-newline">where<br> T: ?<aclass="trait"href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html"title="trait core::marker::Sized">Sized</a>, </span></code><ahref='#impl-BorrowMut%3CT%3E'class='anchor'></a><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#218-220'title='goto source code'>[src]</a></h3><divclass='impl-items'><h4id='method.borrow_mut'class="method hidden"><codeid='borrow_mut.v'>fn <ahref='https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut'class='fnname'>borrow_mut</a>(&mut self) -><aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>T</code><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#219'title='goto source code'>[src]</a></h4><divclass='docblock hidden'><p>Mutably borrows from an owned value. <ahref="https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut">Read more</a></p>
</div></div><h3id='impl-Any'class='impl'><codeclass='in-band'>impl<T><aclass="trait"href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html"title="trait core::any::Any">Any</a> for T <spanclass="where fmt-newline">where<br> T: 'static + ?<aclass="trait"href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html"title="trait core::marker::Sized">Sized</a>, </span></code><ahref='#impl-Any'class='anchor'></a><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/any.rs.html#100-102'title='goto source code'>[src]</a></h3><divclass='impl-items'><h4id='method.type_id'class="method hidden"><codeid='type_id.v'>fn <ahref='https://doc.rust-lang.org/nightly/core/any/trait.Any.html#tymethod.type_id'class='fnname'>type_id</a>(&self) -><aclass="struct"href="https://doc.rust-lang.org/nightly/core/any/struct.TypeId.html"title="struct core::any::TypeId">TypeId</a></code><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/any.rs.html#101'title='goto source code'>[src]</a></h4><divclass='docblock hidden'><p>Gets the <code>TypeId</code> of <code>self</code>. <ahref="https://doc.rust-lang.org/nightly/core/any/trait.Any.html#tymethod.type_id">Read more</a></p>
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