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<section id="functions-in-c-and-c">
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<span id="functions-in-cpp"></span><h1>Functions in C and C++<a class="headerlink" href="#functions-in-c-and-c" title="Link to this heading">¶</a></h1>
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<p>You can use CodeQL to explore functions in C and C++ code.</p>
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<section id="overview">
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<h2>Overview<a class="headerlink" href="#overview" title="Link to this heading">¶</a></h2>
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<p>The standard CodeQL library for C and C++ represents functions using the <code class="docutils literal notranslate"><span class="pre">Function</span></code> class (see <a class="reference internal" href="codeql-library-for-cpp.html"><span class="doc">CodeQL libraries for C and C++</span></a>).</p>
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<p>The example queries in this topic explore some of the most useful library predicates for querying functions.</p>
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</section>
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<section id="finding-all-static-functions">
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<h2>Finding all static functions<a class="headerlink" href="#finding-all-static-functions" title="Link to this heading">¶</a></h2>
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<p>Using the member predicate <code class="docutils literal notranslate"><span class="pre">Function.isStatic()</span></code> we can list all the static functions in a database:</p>
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<div class="highlight-ql notranslate"><div class="highlight"><pre><span></span>import cpp
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from Function f
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where f.isStatic()
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select f, "This is a static function."
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</pre></div>
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</div>
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<p>This query is very general, so there are probably too many results to be interesting for most nontrivial projects.</p>
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</section>
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<section id="finding-functions-that-are-not-called">
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<h2>Finding functions that are not called<a class="headerlink" href="#finding-functions-that-are-not-called" title="Link to this heading">¶</a></h2>
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<p>It might be more interesting to find functions that are not called, using the standard CodeQL <code class="docutils literal notranslate"><span class="pre">FunctionCall</span></code> class from the <strong>abstract syntax tree</strong> category (see <a class="reference internal" href="codeql-library-for-cpp.html"><span class="doc">CodeQL libraries for C and C++</span></a>). The <code class="docutils literal notranslate"><span class="pre">FunctionCall</span></code> class can be used to identify places where a function is actually used, and it is related to <code class="docutils literal notranslate"><span class="pre">Function</span></code> through the <code class="docutils literal notranslate"><span class="pre">FunctionCall.getTarget()</span></code> predicate.</p>
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<div class="highlight-ql notranslate"><div class="highlight"><pre><span></span>import cpp
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from Function f
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where not exists(FunctionCall fc | fc.getTarget() = f)
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select f, "This function is never called."
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</pre></div>
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</div>
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<p>➤ <a class="reference external" href="https://lgtm.com/query/1505891246456/">See this in the query console on LGTM.com</a></p>
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<p>The new query finds functions that are not the target of any <code class="docutils literal notranslate"><span class="pre">FunctionCall</span></code>—in other words, functions that are never called. You may be surprised by how many results the query finds. However, if you examine the results, you can see that many of the functions it finds are used indirectly. To create a query that finds only unused functions, we need to refine the query and exclude other ways of using a function.</p>
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</section>
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<section id="excluding-functions-that-are-referenced-with-a-function-pointer">
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<h2>Excluding functions that are referenced with a function pointer<a class="headerlink" href="#excluding-functions-that-are-referenced-with-a-function-pointer" title="Link to this heading">¶</a></h2>
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<p>You can modify the query to remove functions where a function pointer is used to reference the function:</p>
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<div class="highlight-ql notranslate"><div class="highlight"><pre><span></span>import cpp
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from Function f
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where not exists(FunctionCall fc | fc.getTarget() = f)
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and not exists(FunctionAccess fa | fa.getTarget() = f)
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select f, "This function is never called, or referenced with a function pointer."
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</pre></div>
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</div>
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<p>➤ <a class="reference external" href="https://lgtm.com/query/1505890446605/">See this in the query console on LGTM.com</a></p>
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<p>This query returns fewer results. However, if you examine the results then you can probably still find potential refinements.</p>
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<p>For example, there is a more complicated LGTM <a class="reference external" href="https://lgtm.com/rules/2152580467/">query</a> that finds unused static functions. To see the code for this query, click <strong>Open in query console</strong> at the top of the page.</p>
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<blockquote>
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<div><p>You can explore the definition of an element in the standard libraries and see what predicates are available. Use the keyboard <strong>F3</strong> button to open the definition of any element. Alternatively, hover over the element and click <strong>Jump to definition</strong> in the tooltip displayed. The library file is opened in a new tab with the definition highlighted.</p>
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</div></blockquote>
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</section>
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<section id="finding-a-specific-function">
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<h2>Finding a specific function<a class="headerlink" href="#finding-a-specific-function" title="Link to this heading">¶</a></h2>
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<p>This query uses <code class="docutils literal notranslate"><span class="pre">Function</span></code> and <code class="docutils literal notranslate"><span class="pre">FunctionCall</span></code> to find calls to the function <code class="docutils literal notranslate"><span class="pre">sprintf</span></code> that have a variable format string—which is potentially a security hazard.</p>
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<div class="highlight-ql notranslate"><div class="highlight"><pre><span></span>import cpp
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from FunctionCall fc
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where fc.getTarget().getQualifiedName() = "sprintf"
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and not fc.getArgument(1) instanceof StringLiteral
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select fc, "sprintf called with variable format string."
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</pre></div>
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</div>
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<p>➤ <a class="reference external" href="https://lgtm.com/query/1505889506751/">See this in the query console on LGTM.com</a></p>
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<p>This uses:</p>
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<ul class="simple">
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<li><p><code class="docutils literal notranslate"><span class="pre">Declaration.getQualifiedName()</span></code> to identify calls to the specific function <code class="docutils literal notranslate"><span class="pre">sprintf</span></code>.</p></li>
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<li><p><code class="docutils literal notranslate"><span class="pre">FunctionCall.getArgument(1)</span></code> to fetch the format string argument.</p></li>
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</ul>
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<p>Note that we could have used <code class="docutils literal notranslate"><span class="pre">Declaration.getName()</span></code>, but <code class="docutils literal notranslate"><span class="pre">Declaration.getQualifiedName()</span></code> is a better choice because it includes the namespace. For example: <code class="docutils literal notranslate"><span class="pre">getName()</span></code> would return <code class="docutils literal notranslate"><span class="pre">vector</span></code> where <code class="docutils literal notranslate"><span class="pre">getQualifiedName</span></code> would return <code class="docutils literal notranslate"><span class="pre">std::vector</span></code>.</p>
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<p>The LGTM version of this query is considerably more complicated, but if you look carefully you will find that its structure is the same. See <a class="reference external" href="https://lgtm.com/rules/2152810612/">Non-constant format string</a> and click <strong>Open in query console</strong> at the top of the page.</p>
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</section>
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<section id="further-reading">
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<h2>Further reading<a class="headerlink" href="#further-reading" title="Link to this heading">¶</a></h2>
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<ul class="simple">
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<li><p><a class="reference external" href="https://github.com/github/codeql/tree/main/cpp/ql/src">CodeQL queries for C and C++</a></p></li>
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<li><p><a class="reference external" href="https://github.com/github/codeql/tree/main/cpp/ql/examples">Example queries for C and C++</a></p></li>
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<li><p><a class="reference external" href="https://codeql.github.com/codeql-standard-libraries/cpp/">CodeQL library reference for C and C++</a></p></li>
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</ul>
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<ul class="simple">
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<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>
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<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>
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</ul>
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</section>
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</section>
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</article>
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