import unittest
from llvm.core import (Module, Type, Builder, Constant)
from .support import TestCase, tests

class TestAtomic(TestCase):
    orderings = ['unordered', 'monotonic', 'acquire',
                 'release', 'acq_rel', 'seq_cst']

    atomic_op = ['xchg', 'add', 'sub', 'and', 'nand', 'or', 'xor',
                 'max', 'min', 'umax', 'umin']

    def test_atomic_cmpxchg(self):
        mod = Module.new('mod')
        functype = Type.function(Type.void(), [])
        func = mod.add_function(functype, name='foo')
        bb = func.append_basic_block('entry')
        bldr = Builder.new(bb)
        ptr = bldr.alloca(Type.int())

        old = bldr.load(ptr)
        new = Constant.int(Type.int(), 1234)

        for ordering in self.orderings:
            inst = bldr.atomic_cmpxchg(ptr, old, new, ordering)
            self.assertEqual(ordering, str(inst).strip().split(' ')[-1])

        inst = bldr.atomic_cmpxchg(ptr, old, new, ordering, crossthread=False)
        self.assertEqual('singlethread', str(inst).strip().split(' ')[-2])

    def test_atomic_rmw(self):
        mod = Module.new('mod')
        functype = Type.function(Type.void(), [])
        func = mod.add_function(functype, name='foo')
        bb = func.append_basic_block('entry')
        bldr = Builder.new(bb)
        ptr = bldr.alloca(Type.int())

        val = Constant.int(Type.int(), 1234)

        for ordering in self.orderings:
            inst = bldr.atomic_rmw('xchg', ptr, val, ordering)
            self.assertEqual(ordering, str(inst).split(' ')[-1])

        for op in self.atomic_op:
            inst = bldr.atomic_rmw(op, ptr, val, ordering)
            self.assertEqual(op, str(inst).strip().split(' ')[3])

        inst = bldr.atomic_rmw('xchg', ptr, val, ordering, crossthread=False)
        self.assertEqual('singlethread', str(inst).strip().split(' ')[-2])

        for op in self.atomic_op:
            atomic_op = getattr(bldr, 'atomic_%s' % op)
            inst = atomic_op(ptr, val, ordering)
            self.assertEqual(op, str(inst).strip().split(' ')[3])

    def test_atomic_ldst(self):
        mod = Module.new('mod')
        functype = Type.function(Type.void(), [])
        func = mod.add_function(functype, name='foo')
        bb = func.append_basic_block('entry')
        bldr = Builder.new(bb)
        ptr = bldr.alloca(Type.int())

        for ordering in self.orderings:
            loaded = bldr.atomic_load(ptr, ordering)
            self.assert_('load atomic' in str(loaded))
            self.assertEqual(ordering,
                             str(loaded).strip().split(' ')[-3].rstrip(','))
            self.assert_('align 1' in str(loaded))

            stored = bldr.atomic_store(loaded, ptr, ordering)
            self.assert_('store atomic' in str(stored))
            self.assertEqual(ordering,
                             str(stored).strip().split(' ')[-3].rstrip(','))
            self.assert_('align 1' in str(stored))

            fenced = bldr.fence(ordering)
            self.assertEqual(['fence', ordering],
                             str(fenced).strip().split(' '))

tests.append(TestAtomic)

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