245 lines
13 KiB
HTML
245 lines
13 KiB
HTML
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<title>Running with ASAN and UBSAN - Filament</title>
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<h1 class="menu-title">Filament</h1>
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<div class="right-buttons">
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<a href="https://github.com/google/filament" title="Git repository" aria-label="Git repository">
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<script>
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document.getElementById('sidebar-toggle').setAttribute('aria-expanded', sidebar === 'visible');
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document.getElementById('sidebar').setAttribute('aria-hidden', sidebar !== 'visible');
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Array.from(document.querySelectorAll('#sidebar a')).forEach(function(link) {
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link.setAttribute('tabIndex', sidebar === 'visible' ? 0 : -1);
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});
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</script>
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<div id="content" class="content">
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<main>
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<h1 id="running-with-asanubsan"><a class="header" href="#running-with-asanubsan">Running with ASAN/UBSAN</a></h1>
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<h2 id="enabling"><a class="header" href="#enabling">Enabling</a></h2>
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<p>When building though <code>build.sh</code>, pass the <code>-b</code> flag. This sets the cmake variable
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<code>FILAMENT_ENABLE_ASAN_UBSAN=ON</code> which eventually passes <code>"-fsanitize=address -fsanitize=undefined"</code>
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to all compile and link operations.</p>
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<p>It might be desirable to pair the <code>-b</code> with <code>-y release</code>. The <code>-y</code> flag indicates that targets
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in <code>/tools</code> will be built separately from the filament target, and the filament build depends on
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the <code>/tools</code> targets as prebuilt binaries. This separation reduces ASAN/UBSAN build time
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considerably. This option assumes that the user is trying to catch sanitization issues for
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filament and not the tools that are used to build filament.</p>
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<p>If building through CMake directly, or an IDE like CLion that doesn't use <code>build.sh</code>, instead pass
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<code>-DFILAMENT_ENABLE_ASAN_UBSAN=ON</code> to cmake in order to get the same result.</p>
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<h2 id="getting-memory-leak-detection-on-mac"><a class="header" href="#getting-memory-leak-detection-on-mac">Getting memory leak detection on Mac</a></h2>
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<p>Memory leak detection isn't enabled by default on MacOS. There are two issues to address, first is
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using a version of clang that supports memory leak detection and second is enabling it at runtime.</p>
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<p>The version of clang distributed by Apple (with a version like "Apple clang version 16.0.0") doesn't
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currently support leak detection at all. Instead you will need to get or build a different LLVM,
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such as the one distributed through homebrew and get CMake to use that instead.</p>
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<p>Then during runtime you'll need to have the environment variable <code>ASAN_OPTIONS</code> include the option
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<code>detect_leaks=1</code>. Multiple <code>ASAN_OPTIONS</code> values are concatenated with <code>:</code>.</p>
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<h2 id="getting-memory-leak-output-in-clion"><a class="header" href="#getting-memory-leak-output-in-clion">Getting memory leak output in CLion</a></h2>
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<h3 id="setting-variables"><a class="header" href="#setting-variables">Setting variables</a></h3>
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<p>Under <code>Settings | Build, Execution, Deployment | Dynamic Analysis Tools | Sanitizers</code> there is an
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ASAN Settings field that overrides whatever other <code>ASAN_OPTIONS</code> you might set elsewhere, so you
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must use that instead of setting it through your Run/Debug Configuration.</p>
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<p>To pass <code>-DFILAMENT_ENABLE_ASAN_UBSAN=ON</code> to CMake you'll want to create a new CMake Profile and
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pass it as a CMake argument.</p>
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<h3 id="avoiding-losing-output"><a class="header" href="#avoiding-losing-output">Avoiding losing output</a></h3>
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<p>CMake will consume ASAN output and display it through a separate "Sanitizers" tab. Unfortunately
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certain leak detection errors that interrupt the executable seem to not show up in this tab, but are
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still removed from the user-visible console output. If this is happening and you need to see the
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unfiltered console output you'll need to go to <code>Settings | Build, Execution, Deployment | Dynamic Analysis Tools | Sanitizers</code> and uncheck "Use visual representation for Sanitizer's output".</p>
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</main>
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