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<section id="basic-query-for-swift-code">
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<span id="id1"></span><h1>Basic query for Swift code<a class="headerlink" href="#basic-query-for-swift-code" title="Link to this heading">¶</a></h1>
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<p>Learn to write and run a simple CodeQL query using Visual Studio Code with the CodeQL extension.</p>
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<blockquote>
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<div><blockquote class="pull-quote">
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<div><p>Note</p>
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<p>CodeQL analysis for Swift is currently in beta. During the beta, analysis of Swift code,
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and the accompanying documentation, will not be as comprehensive as for other languages.</p>
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</div></blockquote>
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</div></blockquote>
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<p>For information about installing the CodeQL extension for Visual Studio code, see “<a class="reference internal" href="../codeql-for-visual-studio-code/setting-up-codeql-in-visual-studio-code.html#setting-up-codeql-in-visual-studio-code"><span class="std std-ref">Setting up CodeQL in Visual Studio Code</span></a>.”</p>
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<section id="about-the-query">
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<h2>About the query<a class="headerlink" href="#about-the-query" title="Link to this heading">¶</a></h2>
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<p>The query we’re going to run performs a basic search of the code for <code class="docutils literal notranslate"><span class="pre">if</span></code> expressions that are redundant, in the sense that they have an empty <code class="docutils literal notranslate"><span class="pre">then</span></code> branch. For example, code such as:</p>
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<div class="highlight-swift notranslate"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="n">error</span> <span class="p">{</span>
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<span class="c1">// we should handle the error</span>
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<span class="p">}</span>
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</pre></div>
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</div>
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</section>
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<section id="finding-a-codeql-database-to-experiment-with">
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<h2>Finding a CodeQL database to experiment with<a class="headerlink" href="#finding-a-codeql-database-to-experiment-with" title="Link to this heading">¶</a></h2>
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<p>Before you start writing queries for Swift code, you need a CodeQL database to run them against. The simplest way to do this is to download a database for a repository that uses Swift directly from GitHub.com.</p>
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<ol class="arabic simple">
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<li><p>In Visual Studio Code, click the <strong>QL</strong> icon <a class="reference internal" href="../_images/codeql-extension-icon.png"><img alt="Icon for the CodeQL extension." src="../_images/codeql-extension-icon.png" style="width: 20px;" /></a> in the left sidebar to display the CodeQL extension.</p></li>
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<li><p>Click <strong>From GitHub</strong> or the GitHub logo <a class="reference internal" href="../_images/add-codeql-db-github.png"><img alt="Icon for the CodeQL extension option to download a CodeQL database from GitHub." src="../_images/add-codeql-db-github.png" style="width: 20px;" /></a> at the top of the CodeQL extension to open an entry field.</p></li>
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<li><p>Copy the URL for the repository into the field and press the keyboard <strong>Enter</strong> key. For example, <a class="reference external" href="https://github.com/alamofire/alamofire">https://github.com/alamofire/alamofire</a>.</p></li>
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<li><p>Optionally, if the repository has more than one CodeQL database available, select <code class="docutils literal notranslate"><span class="pre">swift</span></code> to download the database created from the Swift code.</p></li>
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</ol>
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<p>Information about the download progress for the database is shown in the bottom right corner of Visual Studio Code. When the download is complete, the database is shown with a check mark in the <strong>Databases</strong> section of the CodeQL extension (see screenshot below).</p>
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</section>
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<section id="running-a-quick-query">
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<h2>Running a quick query<a class="headerlink" href="#running-a-quick-query" title="Link to this heading">¶</a></h2>
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<p>The CodeQL extension for Visual Studio Code adds several <strong>CodeQL:</strong> commands to the command palette including <strong>Quick Query</strong>, which you can use to run a query without any set up.</p>
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<ol class="arabic">
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<li><p>From the command palette in Visual Studio Code, select <strong>CodeQL: Quick Query</strong>.</p></li>
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<li><p>After a moment, a new tab <em>quick-query.ql</em> is opened, ready for you to write a query for your currently selected CodeQL database (here a <code class="docutils literal notranslate"><span class="pre">swift</span></code> database). If you are prompted to reload your workspace as a multi-folder workspace to allow Quick queries, accept or create a new workspace using the starter workflow.</p>
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<p><img alt="image-quick-query" src="../_images/quick-query-tab-swift.png" /></p>
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</li>
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</ol>
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<ol class="arabic">
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<li><p>In the quick query tab, delete the content and paste in the following query.</p>
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<div class="highlight-ql notranslate"><div class="highlight"><pre><span></span>import swift
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from IfStmt ifStmt
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where ifStmt.getThen().(BraceStmt).getNumberOfElements() = 0
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select ifStmt, "This 'if' statement is redundant."
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</pre></div>
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</div>
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</li>
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</ol>
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<ol class="arabic" start="4">
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<li><p>Save the query in its default location (a temporary “Quick Queries” directory under the workspace for <code class="docutils literal notranslate"><span class="pre">GitHub.vscode-codeql/quick-queries</span></code>).</p></li>
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<li><p>Right-click in the query tab and select <strong>CodeQL: Run Query on Selected Database</strong>. (Alternatively, run the command from the Command Palette.)</p>
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<p>The query will take a few moments to return results. When the query completes, the results are displayed in a CodeQL Query Results view, next to the main editor view.</p>
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<p>The query results are listed in two columns, corresponding to the expressions in the <code class="docutils literal notranslate"><span class="pre">select</span></code> clause of the query. The first column corresponds to the expression <code class="docutils literal notranslate"><span class="pre">ifStmt</span></code> and is linked to the location in the source code of the project where <code class="docutils literal notranslate"><span class="pre">ifStmt</span></code> occurs. The second column is the alert message.</p>
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</li>
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</ol>
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<img alt="../_images/basic-swift-query-results-1.png" class="align-center" src="../_images/basic-swift-query-results-1.png" />
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<p>If any matching code is found, click a link in the <code class="docutils literal notranslate"><span class="pre">ifStmt</span></code> column to open the file and highlight the matching <code class="docutils literal notranslate"><span class="pre">if</span></code> statement.</p>
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<img alt="../_images/basic-swift-query-results-2.png" class="align-center" src="../_images/basic-swift-query-results-2.png" />
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<blockquote class="pull-quote">
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<div><p>Note</p>
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<p>If you want to move your experimental query somewhere more permanent, you need to move the whole <code class="docutils literal notranslate"><span class="pre">Quick</span> <span class="pre">Queries</span></code> directory. The directory is a CodeQL pack with a <code class="docutils literal notranslate"><span class="pre">qlpack.yml</span></code> file that defines the content as queries for Swift CodeQL databases. For more information about CodeQL packs, see “<a class="reference internal" href="../codeql-for-visual-studio-code/working-with-codeql-packs-in-visual-studio-code.html#working-with-codeql-packs-in-visual-studio-code"><span class="std std-ref">Working with CodeQL packs in Visual Studio Code</span></a>.”</p>
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</div></blockquote>
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<section id="about-the-query-structure">
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<h3>About the query structure<a class="headerlink" href="#about-the-query-structure" title="Link to this heading">¶</a></h3>
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<p>After the initial <code class="docutils literal notranslate"><span class="pre">import</span></code> statement, this simple query comprises three parts that serve similar purposes to the FROM, WHERE, and SELECT parts of an SQL query.</p>
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<table class="docutils align-default">
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<thead>
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<tr class="row-odd"><th class="head"><p>Query part</p></th>
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<th class="head"><p>Purpose</p></th>
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<th class="head"><p>Details</p></th>
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</tr>
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</thead>
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<tbody>
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<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">import</span> <span class="pre">swift</span></code></p></td>
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<td><p>Imports the standard CodeQL AST libraries for Swift.</p></td>
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<td><p>Every query begins with one or more <code class="docutils literal notranslate"><span class="pre">import</span></code> statements.</p></td>
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</tr>
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<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">from</span> <span class="pre">IfStmt</span> <span class="pre">ifStmt</span></code></p></td>
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<td><p>Defines the variables for the query.
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Declarations are of the form:
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<code class="docutils literal notranslate"><span class="pre"><type></span> <span class="pre"><variable</span> <span class="pre">name></span></code></p></td>
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<td><p>We use: an <code class="docutils literal notranslate"><span class="pre">IfStmt</span></code> variable for <code class="docutils literal notranslate"><span class="pre">if</span></code> statements.</p></td>
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</tr>
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<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">where</span> <span class="pre">ifStmt.getThen().(BraceStmt).getNumberOfElements()</span> <span class="pre">=</span> <span class="pre">0</span></code></p></td>
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<td><p>Defines a condition on the variables.</p></td>
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<td><p><code class="docutils literal notranslate"><span class="pre">ifStmt.getThen()</span></code>: gets the <code class="docutils literal notranslate"><span class="pre">then</span></code> branch of the <code class="docutils literal notranslate"><span class="pre">if</span></code> expression.
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<code class="docutils literal notranslate"><span class="pre">.(BraceStmt)</span></code>: requires that the <code class="docutils literal notranslate"><span class="pre">then</span></code> branch is a brace statement (<code class="docutils literal notranslate"><span class="pre">{</span> <span class="pre">}</span></code>).
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<code class="docutils literal notranslate"><span class="pre">.getNumberOfElements()</span> <span class="pre">=</span> <span class="pre">0</span></code>: requires that the brace statement contains no child statements.</p></td>
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</tr>
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<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">select</span> <span class="pre">ifStmt,</span> <span class="pre">"This</span> <span class="pre">'if'</span> <span class="pre">statement</span> <span class="pre">is</span> <span class="pre">redundant."</span></code></p></td>
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<td><p>Defines what to report for each match.</p>
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<p><code class="docutils literal notranslate"><span class="pre">select</span></code> statements for queries that are used to find instances of poor coding practice are always in the form:
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<code class="docutils literal notranslate"><span class="pre">select</span> <span class="pre"><program</span> <span class="pre">element>,</span> <span class="pre">"<alert</span> <span class="pre">message>"</span></code></p>
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</td>
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<td><p>Reports the resulting <code class="docutils literal notranslate"><span class="pre">if</span></code> statement with a string that explains the problem.</p></td>
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</tr>
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</tbody>
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</table>
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</section>
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</section>
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<section id="extend-the-query">
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<h2>Extend the query<a class="headerlink" href="#extend-the-query" title="Link to this heading">¶</a></h2>
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<p>Query writing is an inherently iterative process. You write a simple query and then, when you run it, you discover examples that you had not previously considered, or opportunities for improvement.</p>
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<section id="remove-false-positive-results">
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<h3>Remove false positive results<a class="headerlink" href="#remove-false-positive-results" title="Link to this heading">¶</a></h3>
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<p>Browsing the results of our basic query shows that it could be improved. Among the results you are likely to find examples of <code class="docutils literal notranslate"><span class="pre">if</span></code> statements with an <code class="docutils literal notranslate"><span class="pre">else</span></code> branch, where an empty <code class="docutils literal notranslate"><span class="pre">then</span></code> branch does serve a purpose. For example:</p>
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<div class="highlight-swift notranslate"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="p">(</span><span class="n">option</span> <span class="p">==</span> <span class="s">"-verbose"</span><span class="p">)</span> <span class="p">{</span>
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<span class="c1">// nothing to do - handled earlier</span>
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<span class="p">}</span> <span class="k">else</span> <span class="p">{</span>
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<span class="n">handleError</span><span class="p">(</span><span class="s">"unrecognized option"</span><span class="p">)</span>
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<span class="p">}</span>
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</pre></div>
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</div>
|
||
<p>In this case, identifying the <code class="docutils literal notranslate"><span class="pre">if</span></code> statement with the empty <code class="docutils literal notranslate"><span class="pre">then</span></code> branch as redundant is a false positive. One solution to this is to modify the query to select <code class="docutils literal notranslate"><span class="pre">if</span></code> statements where both the <code class="docutils literal notranslate"><span class="pre">then</span></code> and <code class="docutils literal notranslate"><span class="pre">else</span></code> branches are missing.</p>
|
||
<p>To exclude <code class="docutils literal notranslate"><span class="pre">if</span></code> statements that have an <code class="docutils literal notranslate"><span class="pre">else</span></code> branch:</p>
|
||
<ol class="arabic">
|
||
<li><p>Add the following to the where clause:</p>
|
||
<div class="highlight-ql notranslate"><div class="highlight"><pre><span></span>and not exists(ifStmt.getElse())
|
||
</pre></div>
|
||
</div>
|
||
<p>The <code class="docutils literal notranslate"><span class="pre">where</span></code> clause is now:</p>
|
||
<div class="highlight-ql notranslate"><div class="highlight"><pre><span></span>where
|
||
ifStmt.getThen().(BraceStmt).getNumberOfElements() = 0 and
|
||
not exists(ifStmt.getElse())
|
||
</pre></div>
|
||
</div>
|
||
</li>
|
||
<li><p>Re-run the query.</p>
|
||
<p>There are now fewer results because <code class="docutils literal notranslate"><span class="pre">if</span></code> expressions with an <code class="docutils literal notranslate"><span class="pre">else</span></code> branch are no longer included.</p>
|
||
</li>
|
||
</ol>
|
||
</section>
|
||
</section>
|
||
<section id="further-reading">
|
||
<h2>Further reading<a class="headerlink" href="#further-reading" title="Link to this heading">¶</a></h2>
|
||
<ul class="simple">
|
||
<li><p><a class="reference external" href="https://github.com/github/codeql/tree/main/swift/ql/src/queries">CodeQL queries for Swift</a></p></li>
|
||
<li><p><a class="reference external" href="https://github.com/github/codeql/tree/main/swift/ql/examples">Example queries for Swift</a></p></li>
|
||
<li><p><a class="reference external" href="https://codeql.github.com/codeql-standard-libraries/swift/">CodeQL library reference for Swift</a></p></li>
|
||
</ul>
|
||
<ul class="simple">
|
||
<li><p>“<a class="reference internal" href="../ql-language-reference/index.html#ql-language-reference"><span class="std std-ref">QL language reference</span></a>”</p></li>
|
||
<li><p>“<a class="reference internal" href="../codeql-overview/codeql-tools.html#codeql-tools"><span class="std std-ref">CodeQL tools</span></a>”</p></li>
|
||
</ul>
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</section>
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</section>
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