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<html devsite><head>
<title>使用 Valgrind</title>
<meta name="project_path" value="/_project.yaml"/>
<meta name="book_path" value="/_book.yaml"/>
</head>
<body>
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<p><a href="http://valgrind.org/">Valgrind</a> 工具套件包括 Memcheck（用于检测 C 和 C ++ 中与内存相关的错误）、Cachegrind（缓存分析器）、Massif（堆分析器）和其他几种工具。</p>
<p class="note"><strong>注意</strong>：尽管您可以使用 Valgrind 对 Android 进行调试，但大多数 Android 平台开发人员都会使用 <a href="/devices/tech/debug/asan.html">AddressSanitizer</a>。</p>
<h2 id="build-valgrind">构建 Valgrind</h2>
<p>要构建 Valgrind，请运行以下命令：</p>
<pre class="no-pretty-print">
$ mmma -j6 external/valgrind
</pre>
<h2 id="app-valgrind">在应用上使用</h2>
<p>要在某个应用上使用 Valgrind，请运行以下命令：</p>
<pre class="no-pretty-print">
$ adb shell setprop wrap.<em>app_name</em> "logwrapper valgrind"
$ adb shell am start -a android.intent.action.MAIN -n <em>app_name</em>/.MainActivity
</pre>
<code><em>app_name</em></code> 必须是一个完全符合要求的名称，例如 <strong>com.google.example_app</strong>。
<h2 id="server-valgrind">在系统服务器上使用</h2>
<p>要使用 Valgrind 运行系统服务器，请运行以下命令：</p>
<pre class="no-pretty-print">
$ adb shell setprop wrap.system_server "logwrapper valgrind"
$ adb shell stop && adb shell start
</pre>
<h2 id="symbols-valgrind">获取调试符号</h2>
<p>要获取调试符号，请将未剥离的库推送到 <code>/data/local/symbols</code>：</p>
<pre class="no-pretty-print">
$ adb shell mkdir /data/local/symbols
$ adb push $OUT/symbols /data/local/symbols
</pre>
<h2 id="boot-valgrind">在启动过程中使用</h2>
<p>要在启动过程中使用 Valgrind，请修改 <code>out/target/product/XXXX/root/init.rc</code>，具体方法是将</p>
<p><code>service example /system/bin/foo --arg1 --arg2</code></p>
<p>更改为：</p>
<p><code>service example /system/bin/logwrapper /system/bin/valgrind /system/bin/foo --arg1 --arg2</code></p>
<p>要查看效果，请创建一个 <code>boot.img</code> 并重新刷入设备。</p>
</body></html>
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