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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 `/home/fs0c131y/.local/share/cargo/registry/src/github.com-1ecc6299db9ec823/proc-macro2-1.0.24/src/detection.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>detection.rs - source</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled ><script id="default-settings"></script><script src="../../storage.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../../favicon.svg">
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<a id="settings-menu" href="../../settings.html"><img src="../../wheel.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 ">
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">panic</span>::{<span class="self">self</span>, <span class="ident">PanicInfo</span>};
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">sync</span>::<span class="ident">atomic</span>::<span class="kw-2">*</span>;
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">sync</span>::<span class="ident">Once</span>;
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<span class="kw">static</span> <span class="ident">WORKS</span>: <span class="ident">AtomicUsize</span> <span class="op">=</span> <span class="ident">AtomicUsize</span>::<span class="ident">new</span>(<span class="number">0</span>);
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<span class="kw">static</span> <span class="ident">INIT</span>: <span class="ident">Once</span> <span class="op">=</span> <span class="ident">Once</span>::<span class="ident">new</span>();
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<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">inside_proc_macro</span>() <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
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<span class="kw">match</span> <span class="ident">WORKS</span>.<span class="ident">load</span>(<span class="ident">Ordering</span>::<span class="ident">SeqCst</span>) {
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<span class="number">1</span> <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="bool-val">false</span>,
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<span class="number">2</span> <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="bool-val">true</span>,
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<span class="kw">_</span> <span class="op">=</span><span class="op">></span> {}
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}
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<span class="ident">INIT</span>.<span class="ident">call_once</span>(<span class="ident">initialize</span>);
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<span class="ident">inside_proc_macro</span>()
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}
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<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">force_fallback</span>() {
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<span class="ident">WORKS</span>.<span class="ident">store</span>(<span class="number">1</span>, <span class="ident">Ordering</span>::<span class="ident">SeqCst</span>);
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}
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<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">unforce_fallback</span>() {
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<span class="ident">initialize</span>();
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}
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<span class="comment">// Swap in a null panic hook to avoid printing "thread panicked" to stderr,</span>
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<span class="comment">// then use catch_unwind to determine whether the compiler's proc_macro is</span>
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<span class="comment">// working. When proc-macro2 is used from outside of a procedural macro all</span>
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<span class="comment">// of the proc_macro crate's APIs currently panic.</span>
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<span class="comment">//</span>
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<span class="comment">// The Once is to prevent the possibility of this ordering:</span>
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<span class="comment">//</span>
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<span class="comment">// thread 1 calls take_hook, gets the user's original hook</span>
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<span class="comment">// thread 1 calls set_hook with the null hook</span>
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<span class="comment">// thread 2 calls take_hook, thinks null hook is the original hook</span>
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<span class="comment">// thread 2 calls set_hook with the null hook</span>
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<span class="comment">// thread 1 calls set_hook with the actual original hook</span>
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<span class="comment">// thread 2 calls set_hook with what it thinks is the original hook</span>
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<span class="comment">//</span>
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<span class="comment">// in which the user's hook has been lost.</span>
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<span class="comment">//</span>
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<span class="comment">// There is still a race condition where a panic in a different thread can</span>
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<span class="comment">// happen during the interval that the user's original panic hook is</span>
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<span class="comment">// unregistered such that their hook is incorrectly not called. This is</span>
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<span class="comment">// sufficiently unlikely and less bad than printing panic messages to stderr</span>
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<span class="comment">// on correct use of this crate. Maybe there is a libstd feature request</span>
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<span class="comment">// here. For now, if a user needs to guarantee that this failure mode does</span>
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<span class="comment">// not occur, they need to call e.g. `proc_macro2::Span::call_site()` from</span>
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<span class="comment">// the main thread before launching any other threads.</span>
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<span class="kw">fn</span> <span class="ident">initialize</span>() {
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<span class="kw">type</span> <span class="ident">PanicHook</span> <span class="op">=</span> <span class="kw">dyn</span> <span class="ident">Fn</span>(<span class="kw-2">&</span><span class="ident">PanicInfo</span>) <span class="op">+</span> <span class="ident">Sync</span> <span class="op">+</span> <span class="ident">Send</span> <span class="op">+</span> <span class="lifetime">'static</span>;
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<span class="kw">let</span> <span class="ident">null_hook</span>: <span class="ident">Box</span><span class="op"><</span><span class="ident">PanicHook</span><span class="op">></span> <span class="op">=</span> <span class="ident">Box</span>::<span class="ident">new</span>(<span class="op">|</span><span class="ident">_panic_info</span><span class="op">|</span> { <span class="comment">/* ignore */</span> });
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<span class="kw">let</span> <span class="ident">sanity_check</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">null_hook</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">PanicHook</span>;
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<span class="kw">let</span> <span class="ident">original_hook</span> <span class="op">=</span> <span class="ident">panic</span>::<span class="ident">take_hook</span>();
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<span class="ident">panic</span>::<span class="ident">set_hook</span>(<span class="ident">null_hook</span>);
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<span class="kw">let</span> <span class="ident">works</span> <span class="op">=</span> <span class="ident">panic</span>::<span class="ident">catch_unwind</span>(<span class="ident">proc_macro</span>::<span class="ident">Span</span>::<span class="ident">call_site</span>).<span class="ident">is_ok</span>();
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<span class="ident">WORKS</span>.<span class="ident">store</span>(<span class="ident">works</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">+</span> <span class="number">1</span>, <span class="ident">Ordering</span>::<span class="ident">SeqCst</span>);
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<span class="kw">let</span> <span class="ident">hopefully_null_hook</span> <span class="op">=</span> <span class="ident">panic</span>::<span class="ident">take_hook</span>();
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<span class="ident">panic</span>::<span class="ident">set_hook</span>(<span class="ident">original_hook</span>);
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<span class="kw">if</span> <span class="ident">sanity_check</span> <span class="op">!</span><span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">hopefully_null_hook</span> {
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<span class="macro">panic</span><span class="macro">!</span>(<span class="string">"observed race condition in proc_macro2::inside_proc_macro"</span>);
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}
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}
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</pre></div>
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</section><section id="search" class="content hidden"></section><section class="footer"></section><div id="rustdoc-vars" data-root-path="../../" data-current-crate="proc_macro2"></div>
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<link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><style type="text/css">#crate-search{background-image:url("../../down-arrow.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">☰</div><a href='../../proc_macro2/index.html'><div class='logo-container rust-logo'><img src='../../rust-logo.png' alt='logo'></div></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu"><img src="../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices" role="menu"></div></div><script src="../../theme.js"></script><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" disabled autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" class="help-button">?</button>
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<a id="settings-menu" href="../../settings.html"><img src="../../wheel.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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<span id="2"> 2</span>
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<span id="3"> 3</span>
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<span id="4"> 4</span>
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<span id="5"> 5</span>
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<span id="6"> 6</span>
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<span id="7"> 7</span>
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<span id="8"> 8</span>
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<span id="9"> 9</span>
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<span id="10">10</span>
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<span id="18">18</span>
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</pre><div class="example-wrap"><pre class="rust ">
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">marker</span>::<span class="ident">PhantomData</span>;
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">panic</span>::{<span class="ident">RefUnwindSafe</span>, <span class="ident">UnwindSafe</span>};
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">rc</span>::<span class="ident">Rc</span>;
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<span class="comment">// Zero sized marker with the correct set of autotrait impls we want all proc</span>
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<span class="comment">// macro types to have.</span>
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<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">type</span> <span class="ident">Marker</span> <span class="op">=</span> <span class="ident">PhantomData</span><span class="op"><</span><span class="ident">ProcMacroAutoTraits</span><span class="op">></span>;
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<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">use</span> <span class="self">self</span>::<span class="ident">value</span>::<span class="kw-2">*</span>;
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<span class="kw">mod</span> <span class="ident">value</span> {
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<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">marker</span>::<span class="ident">PhantomData</span> <span class="kw">as</span> <span class="ident">Marker</span>;
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}
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<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct</span> <span class="ident">ProcMacroAutoTraits</span>(<span class="ident">Rc</span><span class="op"><</span>()<span class="op">></span>);
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<span class="kw">impl</span> <span class="ident">UnwindSafe</span> <span class="kw">for</span> <span class="ident">ProcMacroAutoTraits</span> {}
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<span class="kw">impl</span> <span class="ident">RefUnwindSafe</span> <span class="kw">for</span> <span class="ident">ProcMacroAutoTraits</span> {}
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</pre></div>
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</section><section id="search" class="content hidden"></section><section class="footer"></section><div id="rustdoc-vars" data-root-path="../../" data-current-crate="proc_macro2"></div>
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