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<div class="section" id="a-first-function">
<h1>A First Function<a class="headerlink" href="#a-first-function" title="Permalink to this headline"></a></h1>
<div class="highlight-python"><div class="highlight"><pre><span class="c">#!/usr/bin/env python</span>
<span class="kn">from</span> <span class="nn">llvm.core</span> <span class="kn">import</span> <span class="o">*</span>
<span class="c">#create a module</span>
<span class="n">module</span> <span class="o">=</span> <span class="n">Module</span><span class="o">.</span><span class="n">new</span><span class="p">(</span><span class="s">&quot;tut1&quot;</span><span class="p">)</span>
<span class="c">#create a function type taking 3 32-bit integers, return a 32-bit integer</span>
<span class="n">ty_int</span> <span class="o">=</span> <span class="n">Type</span><span class="o">.</span><span class="n">int</span><span class="p">(</span><span class="mi">32</span><span class="p">)</span>
<span class="n">func_type</span> <span class="o">=</span> <span class="n">Type</span><span class="o">.</span><span class="n">function</span><span class="p">(</span><span class="n">ty_int</span><span class="p">,</span> <span class="p">(</span><span class="n">ty_int</span><span class="p">,)</span><span class="o">*</span><span class="mi">3</span><span class="p">)</span>
<span class="c">#create a function of that type</span>
<span class="n">mul_add</span> <span class="o">=</span> <span class="n">Function</span><span class="o">.</span><span class="n">new</span> <span class="p">(</span><span class="n">module</span><span class="p">,</span> <span class="n">func_type</span><span class="p">,</span> <span class="s">&quot;mul_add&quot;</span><span class="p">)</span>
<span class="n">mul_add</span><span class="o">.</span><span class="n">calling_convention</span> <span class="o">=</span> <span class="n">CC_C</span>
<span class="n">x</span> <span class="o">=</span> <span class="n">mul_add</span><span class="o">.</span><span class="n">args</span><span class="p">[</span><span class="mi">0</span><span class="p">];</span> <span class="n">x</span><span class="o">.</span><span class="n">name</span> <span class="o">=</span> <span class="s">&quot;x&quot;</span>
<span class="n">y</span> <span class="o">=</span> <span class="n">mul_add</span><span class="o">.</span><span class="n">args</span><span class="p">[</span><span class="mi">1</span><span class="p">];</span> <span class="n">y</span><span class="o">.</span><span class="n">name</span> <span class="o">=</span> <span class="s">&quot;y&quot;</span>
<span class="n">z</span> <span class="o">=</span> <span class="n">mul_add</span><span class="o">.</span><span class="n">args</span><span class="p">[</span><span class="mi">2</span><span class="p">];</span> <span class="n">z</span><span class="o">.</span><span class="n">name</span> <span class="o">=</span> <span class="s">&quot;z&quot;</span>
<span class="c">#implement the function</span>
<span class="c">#new block</span>
<span class="n">blk</span> <span class="o">=</span> <span class="n">mul_add</span><span class="o">.</span><span class="n">append_basic_block</span><span class="p">(</span><span class="s">&quot;entry&quot;</span><span class="p">)</span>
<span class="c">#IR builder</span>
<span class="n">bldr</span> <span class="o">=</span> <span class="n">Builder</span><span class="o">.</span><span class="n">new</span><span class="p">(</span><span class="n">blk</span><span class="p">)</span>
<span class="n">tmp_1</span> <span class="o">=</span> <span class="n">bldr</span><span class="o">.</span><span class="n">mul</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">y</span><span class="p">,</span> <span class="s">&quot;tmp_1&quot;</span><span class="p">)</span>
<span class="n">tmp_2</span> <span class="o">=</span> <span class="n">bldr</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">tmp_1</span><span class="p">,</span> <span class="n">z</span><span class="p">,</span> <span class="s">&quot;tmp_2&quot;</span><span class="p">)</span>
<span class="n">bldr</span><span class="o">.</span><span class="n">ret</span><span class="p">(</span><span class="n">tmp_2</span><span class="p">)</span>
<span class="k">print</span> <span class="n">module</span>
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