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sfpl.py
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sfpl.py
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#!/usr/bin/env python
from pyparsing import *
name = Word(alphas)
number = Word(nums)('number').setParseAction(lambda t: [Number(t[0])])
variable = Word(alphas).setParseAction(lambda t: [Variable(t[0])])
atom = variable | number
expr = Forward()
ifexp = Group(Keyword("if") + expr + Keyword("then") + expr + Keyword("else") + expr)('if').setParseAction(lambda t: [If(t[0][1], t[0][3], t[0][5])])
fexp = Group(name + Literal("(").suppress() + ZeroOrMore(expr) + Literal(")").suppress()).setParseAction(lambda t: [Call(t[0][0], t[0][1:])])
paren = Group(Literal("(").suppress() + expr + Literal(")").suppress())
aexp = ifexp | fexp | atom | paren
op = Group(aexp + oneOf("+ - * / <") + expr).setParseAction(lambda t: [BinaryOperator(t[0][1], t[0][0], t[0][2])])
expr << ( op | aexp)
fdef = Group(Keyword("def") + name + Literal("(").suppress() + Group(ZeroOrMore(name)) + Literal(")").suppress() + expr).setParseAction(lambda t: [FunctionDef(t[0][1], t[0][2], t[0][3])])
program = OneOrMore(fdef | expr)
from llvm.core import Module, Constant, Type, Function, Builder, FCMP_ULT
from llvm.core import FCMP_ULT, FCMP_ONE
class Expression(object):
pass
class Number(Expression):
def __init__(self, value):
self.value = value
def __repr__(self):
return "Number({})".format(self.value)
def gen_code(self, module, builder, variables):
return Constant.real(Type.double(), self.value)
class Variable(Expression):
def __init__(self, name):
self.name = name
def __repr__(self):
return "Variable({})".format(self.name)
def gen_code(self, module, builder, variables):
return variables[self.name]
class If(Expression):
def __init__(self, condition, then_value, else_value):
self.condition = condition
self.then_branch = then_value
self.else_branch = else_value
def __repr__(self):
return "If({}, {}, {})".format(self.condition, self.then_branch, self.else_branch)
def gen_code(self, module, builder, variables):
condition = self.condition.gen_code(module, builder, variables)
condition_bool = builder.fcmp(FCMP_ONE, condition, Constant.real(Type.double(), 0), 'ifcond')
function = builder.basic_block.function
then_block = function.append_basic_block('then')
else_block = function.append_basic_block('else')
merge_block = function.append_basic_block('ifcond')
builder.cbranch(condition_bool, then_block, else_block)
builder.position_at_end(then_block)
then_value = self.then_branch.gen_code(module, builder, variables)
builder.branch(merge_block)
then_block = builder.basic_block
builder.position_at_end(else_block)
else_value = self.else_branch.gen_code(module, builder, variables)
builder.branch(merge_block)
else_block = builder.basic_block
builder.position_at_end(merge_block)
phi = builder.phi(Type.double(), 'iftmp')
phi.add_incoming(then_value, then_block)
phi.add_incoming(else_value, else_block)
return phi
class Call(Expression):
def __init__(self, callee, args):
self.callee = callee
self.args = args
def __repr__(self):
return "Call({}, {})".format(self.callee, self.args)
def gen_code(self, module, builder, variables):
callee = module.get_function_named(self.callee)
arg_values = [i.gen_code(module, builder, variables) for i in self.args]
return builder.call(callee, arg_values, 'calltmp')
class BinaryOperator(Expression):
def __init__(self, operator, lhs, rhs):
self.operator = operator
self.lhs = lhs
self.rhs = rhs
def __repr__(self):
return "BinaryOperator({}, {}, {})".format(self.operator, self.lhs, self.rhs)
def gen_code(self, module, builder, variables):
left = self.lhs.gen_code(module, builder, variables)
right = self.rhs.gen_code(module, builder, variables)
if self.operator == '+':
return builder.fadd(left, right, 'addtmp')
elif self.operator == '-':
return builder.fsub(left, right, 'subtmp')
elif self.operator == '*':
return builder.fmul(left, right, 'multmp')
elif self.operator == '/':
return builder.fdiv(left, right, 'divtmp')
elif self.operator == '<':
result = builder.fcmp(FCMP_ULT, left, right, 'cmptmp')
return builder.uitofp(result, Type.double(), 'booltmp')
else:
raise RuntimeError('Unknown binary operator.')
class FunctionDef(object):
def __init__(self, name, args, body):
self.name = name
self.args = args
self.body = body
def __repr__(self):
return "Function({}, {}, {})".format(self.name, self.args, self.body)
def gen_code(self, module, builder, variables):
funct_type = Type.function(Type.double(), [Type.double()] * len(self.args), False)
function = Function.new(module, funct_type, self.name)
variables = {}
for arg, arg_name in zip(function.args, self.args):
arg.name = arg_name
variables[arg_name] = arg
block = function.append_basic_block('entry')
builder = Builder.new(block)
return_value = self.body.gen_code(module, builder, variables)
builder.ret(return_value)
function.verify()
return function
test = """
def fib(n) if n < 3 then 1 else fib(n-1) + fib(n-2)
def div(a b) a/b
fib(40)
"""
module = Module.new('sfpl')
from pprint import *
res = program.parseString(test, parseAll=True)
pprint(res.asList())
funs = [x.gen_code(module, None, None) for x in res[:-1]]
fun = FunctionDef('', [], res[-1]).gen_code(module, None, None)
from llvm.ee import ExecutionEngine, TargetData
g_llvm_executor = ExecutionEngine.new(module)
ret = g_llvm_executor.run_function(fun, [])
print ret.as_real(Type.double())