#!/usr/bin/python

import unittest
import graph
import interferencegraph
import flowgraph
import ir
from irmach import AbstractInstruction as AI
from target import Nop


class GraphTestCase(unittest.TestCase):
    def testEdge(self):
        g = graph.Graph()
        n1 = graph.Node(g)
        g.addNode(n1)
        n2 = graph.Node(g)
        g.addNode(n2)
        g.addEdge(n1, n2)
        self.assertTrue(g.hasEdge(n2, n1))
        self.assertTrue(g.hasEdge(n1, n2))
        g.delNode(n1)
        g.delNode(n2)

    def testDegree(self):
        g = graph.Graph()
        n1 = graph.Node(g)
        g.addNode(n1)
        n2 = graph.Node(g)
        g.addNode(n2)
        n3 = graph.Node(g)
        g.addNode(n3)
        g.addEdge(n1, n2)
        g.addEdge(n1, n3)
        self.assertEqual(2, n1.Degree)
        self.assertEqual(1, n2.Degree)
        g.delNode(n2)
        self.assertEqual(1, n1.Degree)


class DigraphTestCase(unittest.TestCase):
    pass


class InterferenceGraphTestCase(unittest.TestCase):
    def testNormalUse(self):
        t1 = ir.Temp('t1')
        t2 = ir.Temp('t2')
        t3 = ir.Temp('t3')
        t4 = ir.Temp('t4')
        t5 = ir.Temp('t5')
        t6 = ir.Temp('t6')
        instrs = []
        instrs.append(AI(Nop, dst=[t1]))
        instrs.append(AI(Nop, dst=[t2]))
        instrs.append(AI(Nop, dst=[t3]))
        cfg = flowgraph.FlowGraph(instrs)
        ig = interferencegraph.InterferenceGraph(cfg)

    def testCombine(self):
        t1 = ir.Temp('t1')
        t2 = ir.Temp('t2')
        t3 = ir.Temp('t3')
        t4 = ir.Temp('t4')
        instrs = []
        instrs.append(AI(Nop, dst=[t1]))
        instrs.append(AI(Nop, dst=[t2]))
        instrs.append(AI(Nop, dst=[t3]))
        instrs.append(AI(Nop, dst=[t4], src=[t3]))
        instrs.append(AI(Nop, src=[t4]))
        instrs.append(AI(Nop, src=[t1]))
        instrs.append(AI(Nop, src=[t2]))
        cfg = flowgraph.FlowGraph(instrs)
        ig = interferencegraph.InterferenceGraph(cfg)
        ig.Combine(ig.getNode(t4), ig.getNode(t3))
        self.assertIs(ig.getNode(t4), ig.getNode(t3))


if __name__ == '__main__':
    unittest.main()