llvmpy/docs/source/doc/examples/JITTutorial1.md

layout	title
page	JIT Tutorial 1

{% highlight python %} #!/usr/bin/env python

from llvm.core import *

create a module

module = Module.new ("tut1")

create a function type taking 3 32-bit integers, return a 32-bit integer

ty_int = Type.int (32) func_type = Type.function (ty_int, (ty_int,)*3)

create a function of that type

mul_add = Function.new (module, func_type, "mul_add") mul_add.calling_convention = CC_C x = mul_add.args[0]; x.name = "x" y = mul_add.args[1]; y.name = "y" z = mul_add.args[2]; z.name = "z"

implement the function

new block

blk = mul_add.append_basic_block ("entry")

IR builder

bldr = Builder.new (blk) tmp_1 = bldr.mul (x, y, "tmp_1") tmp_2 = bldr.add (tmp_1, z, "tmp_2")

bldr.ret (tmp_2)

print(module) {% endhighlight %}