import{_ as l,o as c,c as i,a,b as e,w as r,e as s,d as o,r as n}from"./app.6c27e557.js";const p={},u=a("h1",{id:"dump",tabindex:"-1"},[a("a",{class:"header-anchor",href:"#dump","aria-hidden":"true"},"#"),s(" dump")],-1),m={href:"https://arthas.aliyun.com/doc/arthas-tutorials?language=cn&id=command-dump",target:"_blank",rel:"noopener noreferrer"},h=a("code",null,"dump",-1),v=s("\u5728\u7EBF\u6559\u7A0B"),b=a("div",{class:"custom-container tip"},[a("p",{class:"custom-container-title"},"\u63D0\u793A"),a("p",null,"dump \u5DF2\u52A0\u8F7D\u7C7B\u7684 bytecode \u5230\u7279\u5B9A\u76EE\u5F55")],-1),g=s("dump \u547D\u4EE4\u5C06 JVM \u4E2D\u5B9E\u9645\u8FD0\u884C\u7684 class \u7684 byte code dump \u5230\u6307\u5B9A\u76EE\u5F55\uFF0C\u9002\u7528\u573A\u666F\u6279\u91CF\u4E0B\u8F7D\u6307\u5B9A\u5305\u76EE\u5F55\u7684 class \u5B57\u8282\u7801\uFF1B\u5982\u9700\u53CD\u7F16\u8BD1\u5355\u4E00\u7C7B\u3001\u5B9E\u65F6\u67E5\u770B\u7C7B\u4FE1\u606F\uFF0C\u53EF\u53C2\u8003 "),L=s("jad"),k=s("\u3002"),C=o(`<h2 id="\u53C2\u6570\u8BF4\u660E" tabindex="-1"><a class="header-anchor" href="#\u53C2\u6570\u8BF4\u660E" aria-hidden="true">#</a> \u53C2\u6570\u8BF4\u660E</h2><table><thead><tr><th style="text-align:right;">\u53C2\u6570\u540D\u79F0</th><th style="text-align:left;">\u53C2\u6570\u8BF4\u660E</th></tr></thead><tbody><tr><td style="text-align:right;"><em>class-pattern</em></td><td style="text-align:left;">\u7C7B\u540D\u8868\u8FBE\u5F0F\u5339\u914D</td></tr><tr><td style="text-align:right;"><code>[c:]</code></td><td style="text-align:left;">\u7C7B\u6240\u5C5E ClassLoader \u7684 hashcode</td></tr><tr><td style="text-align:right;"><code>[classLoaderClass:]</code></td><td style="text-align:left;">\u6307\u5B9A\u6267\u884C\u8868\u8FBE\u5F0F\u7684 ClassLoader \u7684 class name</td></tr><tr><td style="text-align:right;"><code>[d:]</code></td><td style="text-align:left;">\u8BBE\u7F6E\u7C7B\u6587\u4EF6\u7684\u76EE\u6807\u76EE\u5F55</td></tr><tr><td style="text-align:right;">[E]</td><td style="text-align:left;">\u5F00\u542F\u6B63\u5219\u8868\u8FBE\u5F0F\u5339\u914D\uFF0C\u9ED8\u8BA4\u4E3A\u901A\u914D\u7B26\u5339\u914D</td></tr></tbody></table><h2 id="\u4F7F\u7528\u53C2\u8003" tabindex="-1"><a class="header-anchor" href="#\u4F7F\u7528\u53C2\u8003" aria-hidden="true">#</a> \u4F7F\u7528\u53C2\u8003</h2><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ dump java.lang.String
 HASHCODE  CLASSLOADER  LOCATION
 null                   /Users/admin/logs/arthas/classdump/java/lang/String.class
Affect<span class="token punctuation">(</span>row-cnt:1<span class="token punctuation">)</span> cost <span class="token keyword">in</span> <span class="token number">119</span> ms.
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ dump demo.*
 HASHCODE  CLASSLOADER                                    LOCATION
 3d4eac69  +-sun.misc.Launcher<span class="token variable">$AppClassLoader</span>@3d4eac69    /Users/admin/logs/arthas/classdump/sun.misc.Launcher<span class="token variable">$AppClassLoader</span>-3d4eac69/demo/MathGame.class
             +-sun.misc.Launcher<span class="token variable">$ExtClassLoader</span>@66350f69
Affect<span class="token punctuation">(</span>row-cnt:1<span class="token punctuation">)</span> cost <span class="token keyword">in</span> <span class="token number">39</span> ms.
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ dump <span class="token parameter variable">-d</span> /tmp/output java.lang.String
 HASHCODE  CLASSLOADER  LOCATION
 null                   /tmp/output/java/lang/String.class
Affect<span class="token punctuation">(</span>row-cnt:1<span class="token punctuation">)</span> cost <span class="token keyword">in</span> <span class="token number">138</span> ms.
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><ul><li>\u6307\u5B9A classLoader</li></ul><p>\u6CE8\u610F hashcode \u662F\u53D8\u5316\u7684\uFF0C\u9700\u8981\u5148\u67E5\u770B\u5F53\u524D\u7684 ClassLoader \u4FE1\u606F\uFF0C\u63D0\u53D6\u5BF9\u5E94 ClassLoader \u7684 hashcode\u3002</p><p>\u5982\u679C\u4F60\u4F7F\u7528<code>-c</code>\uFF0C\u4F60\u9700\u8981\u624B\u52A8\u8F93\u5165 hashcode\uFF1A<code>-c &lt;hashcode&gt;</code></p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ dump <span class="token parameter variable">-c</span> 3d4eac69 demo.*
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>\u5BF9\u4E8E\u53EA\u6709\u552F\u4E00\u5B9E\u4F8B\u7684 ClassLoader \u53EF\u4EE5\u901A\u8FC7<code>--classLoaderClass</code>\u6307\u5B9A class name\uFF0C\u4F7F\u7528\u8D77\u6765\u66F4\u52A0\u65B9\u4FBF\uFF1A</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ dump <span class="token parameter variable">--classLoaderClass</span> sun.misc.Launcher<span class="token variable">$AppClassLoader</span> demo.*
 HASHCODE  CLASSLOADER                                    LOCATION
 3d4eac69  +-sun.misc.Launcher<span class="token variable">$AppClassLoader</span>@3d4eac69    /Users/admin/logs/arthas/classdump/sun.misc.Launcher<span class="token variable">$AppClassLoader</span>-3d4eac69/demo/MathGame.class
             +-sun.misc.Launcher<span class="token variable">$ExtClassLoader</span>@66350f69
Affect<span class="token punctuation">(</span>row-cnt:1<span class="token punctuation">)</span> cost <span class="token keyword">in</span> <span class="token number">39</span> ms.
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><ul><li>\u6CE8\uFF1A\u8FD9\u91CC classLoaderClass \u5728 java 8 \u662F sun.misc.Launcher$AppClassLoader\uFF0C\u800C java 11 \u7684 classloader \u662F jdk.internal.loader.ClassLoaders$AppClassLoader\uFF0Ckatacoda \u76EE\u524D\u73AF\u5883\u662F java8\u3002</li></ul><p><code>--classLoaderClass</code> \u7684\u503C\u662F ClassLoader \u7684\u7C7B\u540D\uFF0C\u53EA\u6709\u5339\u914D\u5230\u552F\u4E00\u7684 ClassLoader \u5B9E\u4F8B\u65F6\u624D\u80FD\u5DE5\u4F5C\uFF0C\u76EE\u7684\u662F\u65B9\u4FBF\u8F93\u5165\u901A\u7528\u547D\u4EE4\uFF0C\u800C<code>-c &lt;hashcode&gt;</code>\u662F\u52A8\u6001\u53D8\u5316\u7684\u3002</p>`,14);function _(f,x){const t=n("ExternalLinkIcon"),d=n("RouterLink");return c(),i("div",null,[u,a("p",null,[a("a",m,[h,v,e(t)])]),b,a("p",null,[g,e(d,{to:"/doc/jad.html"},{default:r(()=>[L]),_:1}),k]),C])}const y=l(p,[["render",_],["__file","dump.html.vue"]]);export{y as default};