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docs/source/doc/examples/JITTutorial2.rst

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++-------------------------+
+| layout: page            |
++-------------------------+
+| title: JIT Tutorial 2   |
++-------------------------+
+
+{% highlight python %} #!/usr/bin/env python
+
+from llvm.core import \*
+
+create a module
+===============
+
+module = Module.new ("tut2")
+
+create a function type taking 2 integers, return a 32-bit integer
+=================================================================
+
+ty\_int = Type.int (32) func\_type = Type.function (ty\_int, (ty\_int,
+ty\_int))
+
+create a function of that type
+==============================
+
+gcd = Function.new (module, func\_type, "gcd")
+
+name function args
+==================
+
+x = gcd.args[0]; x.name = "x" y = gcd.args[1]; y.name = "y"
+
+implement the function
+======================
+
+blocks...
+=========
+
+entry = gcd.append\_basic\_block ("entry") ret =
+gcd.append\_basic\_block ("return") cond\_false =
+gcd.append\_basic\_block ("cond\_false") cond\_true =
+gcd.append\_basic\_block ("cond\_true") cond\_false\_2 =
+gcd.append\_basic\_block ("cond\_false\_2")
+
+create a llvm::IRBuilder
+========================
+
+bldr = Builder.new (entry) x\_eq\_y = bldr.icmp (IPRED\_EQ, x, y, "tmp")
+bldr.cbranch (x\_eq\_y, ret, cond\_false)
+
+bldr.position\_at\_end (ret) bldr.ret(x)
+
+bldr.position\_at\_end (cond\_false) x\_lt\_y = bldr.icmp (IPRED\_ULT,
+x, y, "tmp") bldr.cbranch (x\_lt\_y, cond\_true, cond\_false\_2)
+
+bldr.position\_at\_end (cond\_true) y\_sub\_x = bldr.sub (y, x, "tmp")
+recur\_1 = bldr.call (gcd, (x, y\_sub\_x,), "tmp") bldr.ret (recur\_1)
+
+bldr.position\_at\_end (cond\_false\_2) x\_sub\_y = bldr.sub (x, y,
+"x\_sub\_y") recur\_2 = bldr.call (gcd, (x\_sub\_y, y,), "tmp") bldr.ret
+(recur\_2)
+
+print(module) {% endhighlight %}