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<span class="doccomment">//! This module implements run-time feature detection.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The `is_{arch}_feature_detected!(&quot;feature-name&quot;)` macros take the name of a</span>
<span class="doccomment">//! feature as a string-literal, and return a boolean indicating whether the</span>
<span class="doccomment">//! feature is enabled at run-time or not.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! These macros do two things:</span>
<span class="doccomment">//! * map the string-literal into an integer stored as a `Feature` enum,</span>
<span class="doccomment">//! * call a `os::check_for(x: Feature)` function that returns `true` if the</span>
<span class="doccomment">//! feature is enabled.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The `Feature` enums are also implemented in the `arch/{target_arch}.rs`</span>
<span class="doccomment">//! modules.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The `check_for` functions are, in general, Operating System dependent. Most</span>
<span class="doccomment">//! architectures do not allow user-space programs to query the feature bits</span>
<span class="doccomment">//! due to security concerns (x86 is the big exception). These functions are</span>
<span class="doccomment">//! implemented in the `os/{target_os}.rs` modules.</span>

<span class="attribute">#[<span class="ident">macro_use</span>]</span>
<span class="kw">mod</span> <span class="ident">error_macros</span>;

<span class="macro">cfg_if</span><span class="macro">!</span> {
    <span class="kw">if</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;x86&quot;</span>, <span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;x86_64&quot;</span>))]</span> {
        <span class="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">&quot;arch/x86.rs&quot;</span>]</span>
        <span class="attribute">#[<span class="ident">macro_use</span>]</span>
        <span class="kw">mod</span> <span class="ident">arch</span>;
    } <span class="kw">else</span> <span class="kw">if</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="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">&quot;arch/arm.rs&quot;</span>]</span>
        <span class="attribute">#[<span class="ident">macro_use</span>]</span>
        <span class="kw">mod</span> <span class="ident">arch</span>;
    } <span class="kw">else</span> <span class="kw">if</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="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">&quot;arch/aarch64.rs&quot;</span>]</span>
        <span class="attribute">#[<span class="ident">macro_use</span>]</span>
        <span class="kw">mod</span> <span class="ident">arch</span>;
    } <span class="kw">else</span> <span class="kw">if</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;powerpc&quot;</span>)]</span> {
        <span class="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">&quot;arch/powerpc.rs&quot;</span>]</span>
        <span class="attribute">#[<span class="ident">macro_use</span>]</span>
        <span class="kw">mod</span> <span class="ident">arch</span>;
    } <span class="kw">else</span> <span class="kw">if</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;powerpc64&quot;</span>)]</span> {
        <span class="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">&quot;arch/powerpc64.rs&quot;</span>]</span>
        <span class="attribute">#[<span class="ident">macro_use</span>]</span>
        <span class="kw">mod</span> <span class="ident">arch</span>;
    } <span class="kw">else</span> <span class="kw">if</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;mips&quot;</span>)]</span> {
        <span class="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">&quot;arch/mips.rs&quot;</span>]</span>
        <span class="attribute">#[<span class="ident">macro_use</span>]</span>
        <span class="kw">mod</span> <span class="ident">arch</span>;
    } <span class="kw">else</span> <span class="kw">if</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;mips64&quot;</span>)]</span> {
        <span class="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">&quot;arch/mips64.rs&quot;</span>]</span>
        <span class="attribute">#[<span class="ident">macro_use</span>]</span>
        <span class="kw">mod</span> <span class="ident">arch</span>;
    } <span class="kw">else</span> {
        <span class="comment">// Unimplemented architecture:</span>
        <span class="kw">mod</span> <span class="ident">arch</span> {
            <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">Feature</span> {
                <span class="ident">Null</span>
            }
        }
    }
}
<span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">arch</span>::<span class="ident">Feature</span>;

<span class="kw">mod</span> <span class="ident">bit</span>;
<span class="kw">mod</span> <span class="ident">cache</span>;

<span class="macro">cfg_if</span><span class="macro">!</span> {
    <span class="kw">if</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;x86&quot;</span>, <span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;x86_64&quot;</span>))]</span> {
        <span class="comment">// On x86/x86_64 no OS specific functionality is required.</span>
        <span class="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">&quot;os/x86.rs&quot;</span>]</span>
        <span class="kw">mod</span> <span class="ident">os</span>;
    } <span class="kw">else</span> <span class="kw">if</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;linux&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;use_std&quot;</span>))]</span> {
        <span class="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">&quot;os/linux/mod.rs&quot;</span>]</span>
        <span class="kw">mod</span> <span class="ident">os</span>;
    } <span class="kw">else</span> <span class="kw">if</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;freebsd&quot;</span>)]</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="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">&quot;os/aarch64.rs&quot;</span>]</span>
        <span class="kw">mod</span> <span class="ident">aarch64</span>;
        <span class="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">&quot;os/freebsd/mod.rs&quot;</span>]</span>
        <span class="kw">mod</span> <span class="ident">os</span>;
    } <span class="kw">else</span> {
        <span class="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">&quot;os/other.rs&quot;</span>]</span>
        <span class="kw">mod</span> <span class="ident">os</span>;
    }
}
<span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">os</span>::<span class="ident">check_for</span>;
</pre></div>
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