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data-v-0009425e><!--[--><p class="text" data-v-0009425e>What is clice?</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><!--]--><!--[--><!--]--></nav></aside><div class="VPContent has-sidebar" id="VPContent" data-v-d8b57b2d data-v-9a6c75ad><div class="VPDoc has-sidebar has-aside" data-v-9a6c75ad data-v-e6f2a212><!--[--><!--]--><div class="container" data-v-e6f2a212><div class="aside" data-v-e6f2a212><div class="aside-curtain" data-v-e6f2a212></div><div class="aside-container" data-v-e6f2a212><div class="aside-content" data-v-e6f2a212><div class="VPDocAside" data-v-e6f2a212 data-v-cb998dce><!--[--><!--]--><!--[--><!--]--><nav aria-labelledby="doc-outline-aria-label" class="VPDocAsideOutline" data-v-cb998dce data-v-f610f197><div class="content" data-v-f610f197><div class="outline-marker" data-v-f610f197></div><div aria-level="2" class="outline-title" id="doc-outline-aria-label" role="heading" data-v-f610f197>On this page</div><ul class="VPDocOutlineItem root" data-v-f610f197 data-v-53c99d69><!--[--><!--]--></ul></div></nav><!--[--><!--]--><div class="spacer" data-v-cb998dce></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-e6f2a212><div class="content-container" data-v-e6f2a212><!--[--><!--]--><main class="main" data-v-e6f2a212><div style="position:relative;" class="vp-doc _zh_design_compilation" data-v-e6f2a212><div><h1 id="compilation" tabindex="-1">Compilation <a class="header-anchor" href="#compilation" aria-label="Permalink to "Compilation""></a></h1><h2 id="incremental-parsing" tabindex="-1">Incremental Parsing <a class="header-anchor" href="#incremental-parsing" aria-label="Permalink to "Incremental Parsing""></a></h2><p>每当你修改代码时，clice 都必须重新解析文件。clice 使用一种叫做 preamble 的机制实现增量编译以加快重新解析速度。preamble 可被视为 <a href="https://clang.llvm.org/docs/PCHInternals.html" target="_blank" rel="noreferrer">Precompiled Header</a> 的一种特殊情况（内嵌在源文件中）。在打开文件的时候，它会将文件开头的几个预处理指令（被叫做 preamble）构建成 PCH 缓存在磁盘上，后续在解析的时候则可以直接加载 PCH 文件，从而跳过前面几个预处理指令，这样可以大大减少要重新解析的代码量。</p><p>例如，对于如下的代码</p><div class="language-cpp vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">cpp</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">#include</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> <iostream></span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">int</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> main</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> () {</span></span>
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<span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> std</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">::cout </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"><<</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> "Hello world!"</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> <<</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> std</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">::endl;</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span></code></pre></div><p><code>iostream</code> 这个头文件大概有 2w 行代码，clice 会先把 <code>#include <iostream></code> 这一行代码构建成 PCH 文件，在完成之后在使用这个 PCH 文件来解析后面的代码。这样的话后续重新解析的代码量就只剩 5 行了，而不是原本的 2w 行，速度会变得非常快。除非你修改了 preamble 部分的代码，导致需要构建新的 preamble。</p><h2 id="cancel-compilation" tabindex="-1">Cancel Compilation <a class="header-anchor" href="#cancel-compilation" aria-label="Permalink to "Cancel Compilation""></a></h2></div></div></main><footer class="VPDocFooter" data-v-e6f2a212 data-v-1bcd8184><!--[--><!--]--><!----><nav class="prev-next" aria-labelledby="doc-footer-aria-label" data-v-1bcd8184><span class="visually-hidden" id="doc-footer-aria-label" data-v-1bcd8184>Pager</span><div class="pager" data-v-1bcd8184><a class="VPLink link pager-link prev" href="/zh/design/architecture" data-v-1bcd8184><!--[--><span class="desc" data-v-1bcd8184>Previous page</span><span class="title" data-v-1bcd8184>Architecture</span><!--]--></a></div><div class="pager" data-v-1bcd8184><a class="VPLink link pager-link next" href="/zh/design/header-context" data-v-1bcd8184><!--[--><span class="desc" data-v-1bcd8184>Next page</span><span class="title" data-v-1bcd8184>Header Context</span><!--]--></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><!----><!--[--><!--]--></div></div>
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