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<title>Examples - llvm-py</title>
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<h1>Examples</h1>
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<p>Here's an example:</p>
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<div class="content"><!-- Generator: GNU source-highlight 2.4
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt><span style="font-style: italic"><span style="color: #9A1900">#!/usr/bin/env python</span></span>
<span style="font-weight: bold"><span style="color: #000080">from</span></span> llvm<span style="color: #990000">.</span>core <span style="font-weight: bold"><span style="color: #000080">import</span></span> <span style="color: #990000">*</span>
<span style="font-style: italic"><span style="color: #9A1900">## create a module</span></span>
module <span style="color: #990000">=</span> <span style="color: #009900">Module</span><span style="color: #990000">.</span><span style="font-weight: bold"><span style="color: #000000">new</span></span><span style="color: #990000">(</span><span style="color: #FF0000">"my_module"</span><span style="color: #990000">)</span>
<span style="font-style: italic"><span style="color: #9A1900">## create a function type taking two doubles and returning a (32-bit) integer</span></span>
ty<span style="color: #009900">_</span>double <span style="color: #990000">=</span> <span style="color: #009900">Type</span><span style="color: #990000">.</span><span style="font-weight: bold"><span style="color: #000000">double</span></span><span style="color: #990000">()</span>
ty<span style="color: #009900">_</span>int <span style="color: #990000">=</span> <span style="color: #009900">Type</span><span style="color: #990000">.</span><span style="font-weight: bold"><span style="color: #000000">int</span></span><span style="color: #990000">()</span>
ty<span style="color: #009900">_</span>func <span style="color: #990000">=</span> <span style="color: #009900">Type</span><span style="color: #990000">.</span><span style="font-weight: bold"><span style="color: #000000">function</span></span><span style="color: #990000">(</span> ty<span style="color: #009900">_</span>int<span style="color: #990000">,</span> <span style="color: #990000">[</span> ty<span style="color: #009900">_</span>double<span style="color: #990000">,</span> ty<span style="color: #009900">_</span>double <span style="color: #990000">]</span> <span style="color: #990000">)</span>
<span style="font-style: italic"><span style="color: #9A1900">## create a function of this type</span></span>
func <span style="color: #990000">=</span> <span style="color: #009900">Function</span><span style="color: #990000">.</span><span style="font-weight: bold"><span style="color: #000000">new</span></span><span style="color: #990000">(</span> module<span style="color: #990000">,</span> ty<span style="color: #009900">_</span>func<span style="color: #990000">,</span> <span style="color: #FF0000">"foobar"</span> <span style="color: #990000">)</span>
<span style="font-style: italic"><span style="color: #9A1900"># name function args</span></span>
func<span style="color: #990000">.</span>args<span style="color: #990000">[</span><span style="color: #993399">0</span><span style="color: #990000">].</span>name <span style="color: #990000">=</span> <span style="color: #FF0000">"arg1"</span>
func<span style="color: #990000">.</span>args<span style="color: #990000">[</span><span style="color: #993399">1</span><span style="color: #990000">].</span>name <span style="color: #990000">=</span> <span style="color: #FF0000">"arg2"</span>
<span style="font-style: italic"><span style="color: #9A1900">## implement the function</span></span>
<span style="font-style: italic"><span style="color: #9A1900"># add a basic block</span></span>
entry <span style="color: #990000">=</span> func<span style="color: #990000">.</span><span style="font-weight: bold"><span style="color: #000000">append_basic_block</span></span><span style="color: #990000">(</span><span style="color: #FF0000">"entry"</span><span style="color: #990000">)</span>
<span style="font-style: italic"><span style="color: #9A1900"># create an llvm::IRBuilder</span></span>
builder <span style="color: #990000">=</span> <span style="color: #009900">Builder</span><span style="color: #990000">.</span><span style="font-weight: bold"><span style="color: #000000">new</span></span><span style="color: #990000">(</span>entry<span style="color: #990000">)</span>
<span style="font-style: italic"><span style="color: #9A1900"># add two args into tmp1</span></span>
tmp1 <span style="color: #990000">=</span> builder<span style="color: #990000">.</span><span style="font-weight: bold"><span style="color: #000000">add</span></span><span style="color: #990000">(</span>func<span style="color: #990000">.</span>args<span style="color: #990000">[</span><span style="color: #993399">0</span><span style="color: #990000">],</span> func<span style="color: #990000">.</span>args<span style="color: #990000">[</span><span style="color: #993399">1</span><span style="color: #990000">],</span> <span style="color: #FF0000">"tmp1"</span><span style="color: #990000">)</span>
<span style="font-style: italic"><span style="color: #9A1900"># sub `1' from that</span></span>
one <span style="color: #990000">=</span> <span style="color: #009900">Constant</span><span style="color: #990000">.</span><span style="font-weight: bold"><span style="color: #000000">real</span></span><span style="color: #990000">(</span> ty<span style="color: #009900">_</span>double<span style="color: #990000">,</span> <span style="color: #993399">1.0</span> <span style="color: #990000">)</span>
tmp2 <span style="color: #990000">=</span> builder<span style="color: #990000">.</span><span style="font-weight: bold"><span style="color: #000000">sub</span></span><span style="color: #990000">(</span>tmp1<span style="color: #990000">,</span> one<span style="color: #990000">,</span> <span style="color: #FF0000">"tmp2"</span><span style="color: #990000">)</span>
<span style="font-style: italic"><span style="color: #9A1900"># convert to integer</span></span>
tmp3 <span style="color: #990000">=</span> builder<span style="color: #990000">.</span><span style="font-weight: bold"><span style="color: #000000">fptoui</span></span><span style="color: #990000">(</span>tmp2<span style="color: #990000">,</span> ty<span style="color: #009900">_</span>int<span style="color: #990000">,</span> <span style="color: #FF0000">"tmp3"</span><span style="color: #990000">)</span>
<span style="font-style: italic"><span style="color: #9A1900"># return it</span></span>
builder<span style="color: #990000">.</span><span style="font-weight: bold"><span style="color: #000000">ret</span></span><span style="color: #990000">(</span>tmp3<span style="color: #990000">)</span>
<span style="font-style: italic"><span style="color: #9A1900"># dump the module to see the llvm "assembly" code</span></span>
<span style="font-weight: bold"><span style="color: #0000FF">print</span></span> module
</tt></pre></div></div>
<p>which gives this output:</p>
<div class="listingblock">
<div class="content">
<pre><tt>; ModuleID = 'my_module'
define i32 @foobar(double %arg1, double %arg2) {
entry:
%temp1 = add double %arg1, %arg2 ; &lt;double&gt; [#uses=1]
%temp2 = sub double %temp1, 1.000000e+00 ; &lt;double&gt; [#uses=1]
%temp3 = fptoui double %temp2 to i32 ; &lt;i32&gt; [#uses=1]
ret i32 %temp3
}</tt></pre>
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