61 lines
2.6 KiB
HTML
61 lines
2.6 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
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"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<meta name="generator" content="AsciiDoc 8.6.9" />
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<title>Shellcode Compiler Runtime</title>
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<link rel="stylesheet" href="lib/v35.css" type="text/css" />
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<link rel="stylesheet" href="lib/layout2v35.css" type="text/css" />
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asciidoc.install();
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</head>
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<body>
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<div id="layout-menu-box">
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<div id="layout-menu">
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<div>»<a href="index.html">Home</a></div>
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<div>»<a href="examples.html">Examples</a></div>
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<div>»<a href="scc.html">Invocation</a></div>
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<div>»<a href="runtime.html">Runtime Library</a></div>
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<div>»<a href="python.html">Python Bindings</a></div>
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<div>»<a href="issues.html">Known Issues</a></div>
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</div>
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</div>
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<div id="layout-content-box">
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<div id="layout-banner">
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<div id="layout-title">Shellcode Compiler</div>
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<div id="layout-description">A custom shellcode compiler for Binary Ninja</div>
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</div>
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<div id="layout-content">
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<div id="header">
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<h1>__undefined</h1>
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</div>
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<div id="content">
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<div id="preamble">
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<div class="sectionbody">
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<div class="listingblock">
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<div class="content monospaced">
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<pre>__undefined;</pre>
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</div></div>
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<div class="paragraph"><p>This intrinsic can be used in place of any value. It gives undefined results, usually by omitting
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code. The runtime result will vary based on the choices of the optimizer and code generator. The compiler
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will typically leave the register or memory location being targeted in its original state, completely
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omitting any instructions that would have been required to update it. Any arithmetic performed with
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<span class="monospaced">__undefined</span> as part of the computation will optimized down to a single usage of the <span class="monospaced">__undefined</span>
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intrinsic, as the results are by definition undefined.</p></div>
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<div class="paragraph"><p>One of the most common uses of this intrinsic is to exit the program while treating the exit code as
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a "don’t care" value, using <span class="monospaced">exit(__undefined)</span>. A <span class="monospaced">main</span> function that returns <span class="monospaced">void</span> implicitly
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does this.</p></div>
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</div>
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</div>
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</div>
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<div id="footnotes"><hr /></div>
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</div>
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</div>
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</body>
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</html>
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