docs/AddressSanitizer.html - platform/external/clang - Gitiles

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 <h1>AddressSanitizer</h1>
 <ul>
   <li> <a href="intro">Introduction</a>
   <li> <a href="usage">Usage</a>
     <ul><li> <a href="has_feature">__has_feature(address_sanitizer)</a></ul>
   <li> <a href="platforms">Supported Platforms</a>
   <li> <a href="limitations">Limitations</a>
   <li> <a href="status">Current Status</a>
 </ul>

 <h2 id="intro">Introduction</h2>
 AddressSanitizer is a fast memory error detector.
 It consists of a compiler instrumentation module and a run-time library.
 The tool can detect the following types of bugs:
 <ul> <li> Out-of-bounds accesses to  <ul><li>heap <li>stack <li>globals</ul>
   <li> Use-after-free
   <li> Use-after-return (to some extent)
   <li> Double-free
 </ul>
 Typical slowdown introduced by AddressSanitizer is <b>2x</b>.

 <h2 id="intro">Usage</h2>
 In order to use AddressSanitizer simply compile and link your program with
 <tt>-faddress-sanitizer</tt> flag.
 To get a reasonable performance add <tt>-O1</tt> or higher.
 If a bug is detected, the program will print an error message and exit with a
 non-zero exit code.

 <h3 id="has_feature">__has_feature(address_sanitizer)</h3>
 In some cases one may need to execute different code depending on whether
 AddressSanitizer is enabled.
 <a href="LanguageExtensions.html#__has_feature_extension">__has_feature</a>
 can be used for this purpose.
 <pre>
 #if defined(__has_feature) && __has_feature(address_sanitizer)
   code that runs only under AddressSanitizer
 #else
   code that does not run under AddressSanitizer
 #endif
 </pre>

 <h2 id="platforms">Supported Platforms</h2>
 AddressSanitizer is supported on the following platforms:
 <ul> <li>Linux <ul> <li> i386 <li> x86_64 <li> ARM </ul>
      <li>Darwin <ul> <li> i386 <li> x86_64 </ul>
 </ul>

 <h2 id="limitations">Limitations</h2>
 <ul>
   <li> AddressSanitizer uses more real memory than a native run.
   How much -- depends on the allocations sizes. The smaller the
   allocations you make the bigger the overhead.
   <li> On 64-bit platforms AddressSanitizer maps (but not reserves)
   16+ Terabytes of virtual address space.
   This means that tools like <tt>ulimit</tt> may not work as usually expected.
   <li> Static linking is not supported.
 </ul>


 <h2 id="status">Current Status</h2>
 AddressSanitizer is work-in-progress and is not yet fully functional in the LLVM/Clang head.
 For the up-to-date usable version and full documentation refer to
 <a href="http://code.google.com/p/address-sanitizer/">http://code.google.com/p/address-sanitizer</a>.


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	<title>AddressSanitizer, a fast memory error detector</title>
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	<link type="text/css" rel="stylesheet" href="../content.css">
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	td {
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	<div id="content">

	<h1>AddressSanitizer</h1>
	<ul>
	<li> <a href="intro">Introduction</a>
	<li> <a href="usage">Usage</a>
	<ul><li> <a href="has_feature">__has_feature(address_sanitizer)</a></ul>
	<li> <a href="platforms">Supported Platforms</a>
	<li> <a href="limitations">Limitations</a>
	<li> <a href="status">Current Status</a>
	</ul>

	<h2 id="intro">Introduction</h2>
	AddressSanitizer is a fast memory error detector.
	It consists of a compiler instrumentation module and a run-time library.
	The tool can detect the following types of bugs:
	<ul> <li> Out-of-bounds accesses to <ul><li>heap <li>stack <li>globals</ul>
	<li> Use-after-free
	<li> Use-after-return (to some extent)
	<li> Double-free
	</ul>
	Typical slowdown introduced by AddressSanitizer is <b>2x</b>.

	<h2 id="intro">Usage</h2>
	In order to use AddressSanitizer simply compile and link your program with
	<tt>-faddress-sanitizer</tt> flag.
	To get a reasonable performance add <tt>-O1</tt> or higher.
	If a bug is detected, the program will print an error message and exit with a
	non-zero exit code.

	<h3 id="has_feature">__has_feature(address_sanitizer)</h3>
	In some cases one may need to execute different code depending on whether
	AddressSanitizer is enabled.
	<a href="LanguageExtensions.html#__has_feature_extension">__has_feature</a>
	can be used for this purpose.
	<pre>
	#if defined(__has_feature) && __has_feature(address_sanitizer)
	code that runs only under AddressSanitizer
	#else
	code that does not run under AddressSanitizer
	#endif
	</pre>

	<h2 id="platforms">Supported Platforms</h2>
	AddressSanitizer is supported on the following platforms:
	<ul> <li>Linux <ul> <li> i386 <li> x86_64 <li> ARM </ul>
	<li>Darwin <ul> <li> i386 <li> x86_64 </ul>
	</ul>

	<h2 id="limitations">Limitations</h2>
	<ul>
	<li> AddressSanitizer uses more real memory than a native run.
	How much -- depends on the allocations sizes. The smaller the
	allocations you make the bigger the overhead.
	<li> On 64-bit platforms AddressSanitizer maps (but not reserves)
	16+ Terabytes of virtual address space.
	This means that tools like <tt>ulimit</tt> may not work as usually expected.
	<li> Static linking is not supported.
	</ul>


	<h2 id="status">Current Status</h2>
	AddressSanitizer is work-in-progress and is not yet fully functional in the LLVM/Clang head.
	For the up-to-date usable version and full documentation refer to
	<a href="http://code.google.com/p/address-sanitizer/">http://code.google.com/p/address-sanitizer</a>.


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	</body>
	</html>