TypePHP 编译器
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36 lines
4.2 KiB
36 lines
4.2 KiB
<!doctype html><html lang="zh"><head><meta charset="utf-8">
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<meta name="viewport" content="width=device-width,initial-scale=1">
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<title>优化器</title>
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<script src="../script/mermaid.min.js"></script>
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<script>document.addEventListener('DOMContentLoaded',function(){if(window.mermaid)mermaid.initialize({startOnLoad:true});});</script>
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<style>
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:root{--bg:#0f1117;--fg:#e6e6e6;--muted:#9aa0aa;--accent:#6ea8fe;--card:#171a21;--border:#262b36;}
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*{box-sizing:border-box}
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body{margin:0;font-family:-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--fg);line-height:1.65}
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.wrap{max-width:900px;margin:0 auto;padding:32px 24px 80px}
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h1,h2,h3{color:#fff;line-height:1.3;margin-top:1.6em}
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h1{border-bottom:1px solid var(--border);padding-bottom:.3em}
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a{color:var(--accent);text-decoration:none}
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a:hover{text-decoration:underline}
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code{background:#0b0d12;padding:.15em .4em;border-radius:4px;font-size:.9em}
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pre{background:#0b0d12;border:1px solid var(--border);border-radius:8px;padding:14px;overflow:auto}
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pre code{background:none;padding:0}
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table{border-collapse:collapse;width:100%;margin:1em 0}
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th,td{border:1px solid var(--border);padding:8px 10px;text-align:left}
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th{background:var(--card)}
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blockquote{border-left:3px solid var(--accent);margin:1em 0;padding:.2em 1em;color:var(--muted);background:var(--card)}
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hr{border:none;border-top:1px solid var(--border);margin:2em 0}
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</style></head>
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<body><div class="wrap"><h1>优化器</h1>
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<p>TypePHP 在语义分析阶段运行一组 <strong>SSA（静态单赋值）驱动</strong>的优化器，目标是减少运行时开销与生成的 C++ 体积。优化入口与 SSA 构建分别在 <code>src/Optimizer/</code> 与 <code>src/Analysis/SsaBuilder.php</code>。</p>
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<p>Sources: <a href="file:///D:\git\php\aot-compiler\src\Optimizer">src/Optimizer/</a> · <a href="file:///D:\git\php\aot-compiler\src\Analysis\SsaBuilder.php">src/Analysis/SsaBuilder.php</a></p>
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<h2>优化器清单</h2>
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<table><thead><tr><th>类</th><th>作用</th></tr></thead><tbody><tr><td><code>SsaBuilder</code></td><td>构建 SSA 形式，为下游优化提供定义-使用链</td></tr><tr><td><code>SsaTypeOptimizer</code></td><td>基于 SSA 的类型推导，传播确定类型以去除运行时 <code>php::Var</code> 装箱</td></tr><tr><td><code>SsaPropOptimizer</code></td><td>属性类型的 SSA 推导与去虚化</td></tr><tr><td><code>FuncCallOptimizer</code></td><td>函数调用优化（内联候选、已知函数特化等）</td></tr><tr><td><code>LoopVarOptimizer</code></td><td>循环变量类型/作用域优化</td></tr></tbody></table>
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<p>Sources: <a href="file:///D:\git\php\aot-compiler\src\Optimizer\SsaTypeOptimizer.php">src/Optimizer/SsaTypeOptimizer.php</a> · <a href="file:///D:\git\php\aot-compiler\src\Optimizer\SsaPropOptimizer.php">src/Optimizer/SsaPropOptimizer.php</a> · <a href="file:///D:\git\php\aot-compiler\src\Optimizer\FuncCallOptimizer.php">src/Optimizer/FuncCallOptimizer.php</a> · <a href="file:///D:\git\php\aot-compiler\src\Optimizer\LoopVarOptimizer.php">src/Optimizer/LoopVarOptimizer.php</a></p>
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<h2>与优化级别的关系</h2>
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<p>命令行 <code>-O <level></code>（0–3）控制优化强度：级别越高，优化器介入越深、生成代码越紧凑，但编译期耗时也越大；<code>-d/--debug</code> 会关闭优化并加调试符号。</p>
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<p>Sources: <a href="file:///D:\git\php\aot-compiler\src\Translator.php#L234-L236">src/Translator.php</a> · <a href="file:///D:\git\php\aot-compiler\src\Translator.php#L272-L274">src/Translator.php</a></p>
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<h2>与类型系统的协同</h2>
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<p>SSA 类型优化直接消费 <a href="pages/type-check.html">类型检查与兼容</a> 的判定结果——一旦推导确认某变量是固定原生类型，生成器即可发射 <code>php::Int</code> 而非通用 <code>php::Var</code>，省去 zval 装箱。这是「原生类型优先」原则在运行期的落地。</p>
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<h2>相关阅读</h2>
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<ul><li>类型如何判定 → <a href="pages/type-check.html">类型检查与兼容</a></li><li>编译期属性如何辅助优化 → <a href="pages/compile-time-attributes.html">编译期属性</a></li><li>整体速度瓶颈与改进 → <a href="pages/build-speed.html">构建速度与性能</a></li></ul></div></body></html> |