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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 to the Rust file `src/libcore/../stdsimd/crates/core_arch/src/arm/armclang.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>armclang.rs.html -- source</title><link rel="stylesheet" type="text/css" href="../../../../../../../../normalize1.35.0.css"><link rel="stylesheet" type="text/css" href="../../../../../../../../rustdoc1.35.0.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../../../../../../../dark1.35.0.css"><link rel="stylesheet" type="text/css" href="../../../../../../../../light1.35.0.css" id="themeStyle"><script src="../../../../../../../../storage1.35.0.js"></script><noscript><link rel="stylesheet" href="../../../../../../../../noscript1.35.0.css"></noscript><link rel="shortcut icon" href="../../../../../../../../favicon1.35.0.ico"><style type="text/css">#crate-search{background-image:url("../../../../../../../../down-arrow1.35.0.svg");}</style></head><body class="rustdoc source"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">&#9776;</div><a href='../../../../../../../../core/index.html'><img src='../../../../../../../../rust-logo1.35.0.png' alt='logo' width='100'></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../../../../../../../brush1.35.0.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../../../../../../../theme1.35.0.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><a id="settings-menu" href="../../../../../../../../settings.html"><img src="../../../../../../../../wheel1.35.0.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><pre class="line-numbers"><span id="1"> 1</span>
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</pre><div class="example-wrap"><pre class="rust ">
<span class="doccomment">//! ARM compiler specific intrinsics</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # References</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! - [ARM Compiler v 6.10 - armclang Reference Guide][arm_comp_ref]</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! [arm_comp_ref]: https://developer.arm.com/docs/100067/0610</span>

<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">use</span> <span class="ident">stdsimd_test</span>::<span class="ident">assert_instr</span>;

<span class="doccomment">/// Inserts a breakpoint instruction.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `val` is a compile-time constant integer in range `[0, 255]`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The breakpoint instruction inserted is:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * `BKPT` when compiling as T32,</span>
<span class="doccomment">/// * `BRK` when compiling as A32 or A64.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Safety</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If `val` is out-of-range the behavior is **undefined**.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Note</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [ARM&#39;s documentation][arm_docs] defines that `__breakpoint` accepts the</span>
<span class="doccomment">/// following values for `val`:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// - `0...65535` when compiling as A32 or A64,</span>
<span class="doccomment">/// - `0...255` when compiling as T32.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The current implementation only accepts values in range `[0, 255]` - if the</span>
<span class="doccomment">/// value is out-of-range the behavior is **undefined**.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [arm_docs]: https://developer.arm.com/docs/100067/latest/compiler-specific-intrinsics/__breakpoint-intrinsic</span>
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">all</span>(<span class="ident">test</span>, <span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;arm&quot;</span>), <span class="ident">assert_instr</span>(<span class="ident">bkpt</span>, <span class="ident">val</span> <span class="op">=</span> <span class="number">0</span>))]</span>
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">all</span>(<span class="ident">test</span>, <span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;aarch64&quot;</span>), <span class="ident">assert_instr</span>(<span class="ident">brk</span>, <span class="ident">val</span> <span class="op">=</span> <span class="number">0</span>))]</span>
<span class="attribute">#[<span class="ident">inline</span>(<span class="ident">always</span>)]</span>
<span class="attribute">#[<span class="ident">rustc_args_required_const</span>(<span class="number">0</span>)]</span>
<span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">__breakpoint</span>(<span class="ident">val</span>: <span class="ident">i32</span>) {
    <span class="comment">// Ensure that this compiles correctly on non-arm architectures, so libstd</span>
    <span class="comment">// doc builds work. The proper macro will shadow this definition below.</span>
    <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused_macros</span>)]</span>
    <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">call</span> {
        (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">e</span>:<span class="ident">expr</span>) <span class="op">=&gt;</span> {
            ()
        };
    }

    <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;arm&quot;</span>)]</span>
    <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">call</span> {
        (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">imm8</span>:<span class="ident">expr</span>) <span class="op">=&gt;</span> {
            <span class="macro">asm</span><span class="macro">!</span>(<span class="macro">concat</span><span class="macro">!</span>(<span class="string">&quot;BKPT &quot;</span>, <span class="macro">stringify</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">imm8</span>)) : : : : <span class="string">&quot;volatile&quot;</span>)
        }
    }

    <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;aarch64&quot;</span>)]</span>
    <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">call</span> {
        (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">imm8</span>:<span class="ident">expr</span>) <span class="op">=&gt;</span> {
            <span class="macro">asm</span><span class="macro">!</span>(<span class="macro">concat</span><span class="macro">!</span>(<span class="string">&quot;BRK &quot;</span>, <span class="macro">stringify</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">imm8</span>)) : : : : <span class="string">&quot;volatile&quot;</span>)
        }
    }

    <span class="comment">// We can&#39;t `panic!` inside this intrinsic, so we can&#39;t really validate the</span>
    <span class="comment">// arguments here. If `val` is out-of-range this macro uses `val == 255`:</span>
    <span class="macro">constify_imm8</span><span class="macro">!</span>(<span class="ident">val</span>, <span class="ident">call</span>);
}
</pre></div>
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