| 1 | #!/usr/bin/env python3
|
| 2 | """
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| 3 | pass_state_test.py: Tests for pass_state.py
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| 4 | """
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| 5 | from __future__ import print_function
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| 6 |
|
| 7 | import unittest
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| 8 |
|
| 9 | import pass_state # module under test
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| 10 |
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| 11 |
|
| 12 | class VirtualTest(unittest.TestCase):
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| 13 |
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| 14 | def testVirtual(self):
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| 15 | """
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| 16 | Example:
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| 17 |
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| 18 | class Base(object):
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| 19 | def method(self): # we don't know if this is virtual yet
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| 20 | pass
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| 21 | def x(self):
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| 22 | pass
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| 23 |
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| 24 | class Derived(Base):
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| 25 | def method(self): # now it's virtual!
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| 26 | pass
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| 27 | def y(self):
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| 28 | pass
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| 29 | """
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| 30 | v = pass_state.Virtual()
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| 31 | v.OnMethod(('Base', ), 'method')
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| 32 | v.OnMethod(('Base', ), 'x')
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| 33 | v.OnSubclass(('Base', ), ('Derived', ))
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| 34 | v.OnMethod(('Derived', ), 'method')
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| 35 | v.OnMethod(('Derived', ), 'y')
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| 36 |
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| 37 | v.Calculate()
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| 38 |
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| 39 | print(v.virtuals)
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| 40 | self.assertEqual(
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| 41 | {
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| 42 | (('Base', ), 'method'): None,
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| 43 | (('Derived', ), 'method'): (('Base', ), 'method')
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| 44 | }, v.virtuals)
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| 45 |
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| 46 | self.assertEqual(True, v.IsVirtual(('Base', ), 'method'))
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| 47 | self.assertEqual(True, v.IsVirtual(('Derived', ), 'method'))
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| 48 | self.assertEqual(False, v.IsVirtual(('Derived', ), 'y'))
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| 49 |
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| 50 | self.assertEqual(False, v.IsVirtual(('Klass', ), 'z'))
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| 51 |
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| 52 | self.assertEqual(True, v.HasVTable(('Base', )))
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| 53 | self.assertEqual(True, v.HasVTable(('Derived', )))
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| 54 |
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| 55 | self.assertEqual(False, v.HasVTable(('Klass', )))
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| 56 |
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| 57 | def testNoInit(self):
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| 58 | v = pass_state.Virtual()
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| 59 | v.OnMethod(('Base', ), '__init__')
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| 60 | v.OnSubclass(('Base', ), ('Derived', ))
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| 61 | v.OnMethod(('Derived', ), '__init__')
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| 62 | v.Calculate()
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| 63 | self.assertEqual(False, v.HasVTable(('Base', )))
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| 64 | self.assertEqual(False, v.HasVTable(('Derived', )))
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| 65 |
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| 66 | def testCanReorderFields(self):
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| 67 | """
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| 68 | class Base(object):
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| 69 | def __init__(self):
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| 70 | self.s = '' # pointer
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| 71 | self.i = 42
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| 72 |
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| 73 | class Derived(Base):
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| 74 | def __init__(self):
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| 75 | Base.__init__()
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| 76 | self.mylist = [] # type: List[str]
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| 77 |
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| 78 | Note: we can't reorder these, even though there are no virtual methods.
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| 79 | """
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| 80 | v = pass_state.Virtual()
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| 81 | v.OnSubclass(('Base2', ), ('Derived2', ))
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| 82 | v.Calculate()
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| 83 |
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| 84 | self.assertEqual(False, v.CanReorderFields(('Base2', )))
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| 85 | self.assertEqual(False, v.CanReorderFields(('Derived2', )))
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| 86 |
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| 87 | self.assertEqual(True, v.CanReorderFields(('Klass2', )))
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| 88 |
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| 89 | def testBaseCollision(self):
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| 90 | v = pass_state.Virtual()
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| 91 | v.OnSubclass((
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| 92 | 'moduleA',
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| 93 | 'Base',
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| 94 | ), (
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| 95 | 'foo',
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| 96 | 'Derived',
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| 97 | ))
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| 98 | with self.assertRaises(AssertionError):
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| 99 | v.OnSubclass((
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| 100 | 'moduleB',
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| 101 | 'Base',
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| 102 | ), (
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| 103 | 'bar',
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| 104 | 'Derived',
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| 105 | ))
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| 106 |
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| 107 | def testSubclassMapping(self):
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| 108 | v = pass_state.Virtual()
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| 109 | v.OnMethod((
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| 110 | 'moduleA',
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| 111 | 'Base',
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| 112 | ), 'frobnicate')
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| 113 | v.OnSubclass((
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| 114 | 'moduleA',
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| 115 | 'Base',
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| 116 | ), (
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| 117 | 'foo',
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| 118 | 'Derived',
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| 119 | ))
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| 120 | v.OnMethod((
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| 121 | 'foo',
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| 122 | 'Derived',
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| 123 | ), 'frobnicate')
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| 124 | v.OnSubclass((
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| 125 | 'moduleA',
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| 126 | 'Base',
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| 127 | ), (
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| 128 | 'bar',
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| 129 | 'Derived',
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| 130 | ))
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| 131 | v.OnMethod((
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| 132 | 'bar',
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| 133 | 'Derived',
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| 134 | ), 'frobnicate')
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| 135 | v.Calculate()
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| 136 | self.assertEqual((('moduleA', 'Base'), 'frobnicate'),
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| 137 | v.virtuals[(('foo', 'Derived'), 'frobnicate')])
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| 138 | self.assertEqual((('moduleA', 'Base'), 'frobnicate'),
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| 139 | v.virtuals[(('bar', 'Derived'), 'frobnicate')])
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| 140 | self.assertEqual(None, v.virtuals[(('moduleA', 'Base'), 'frobnicate')])
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| 141 |
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| 142 |
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| 143 | class DummyFact(pass_state.Fact):
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| 144 |
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| 145 | def __init__(self, n: int) -> None:
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| 146 | self.n = n
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| 147 |
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| 148 | def name(self):
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| 149 | return 'dummy'
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| 150 |
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| 151 | def Generate(self, func: str, statement: int) -> str:
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| 152 | return '{},{},{}'.format(func, statement, self.n)
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| 153 |
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| 154 |
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| 155 | class ControlFlowGraphTest(unittest.TestCase):
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| 156 |
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| 157 | def testLinear(self):
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| 158 | cfg = pass_state.ControlFlowGraph()
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| 159 |
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| 160 | a = cfg.AddStatement()
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| 161 | b = cfg.AddStatement()
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| 162 | c = cfg.AddStatement()
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| 163 | d = cfg.AddStatement()
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| 164 |
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| 165 | cfg.AddFact(b, DummyFact(1))
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| 166 | cfg.AddFact(d, DummyFact(99))
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| 167 | cfg.AddFact(d, DummyFact(7))
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| 168 |
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| 169 | expected_edges = {
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| 170 | (0, a),
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| 171 | (a, b),
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| 172 | (b, c),
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| 173 | (c, d),
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| 174 | }
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| 175 | self.assertEqual(expected_edges, cfg.edges)
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| 176 |
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| 177 | self.assertEqual(1, len(cfg.facts[b]))
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| 178 | self.assertEqual('foo,1,1', cfg.facts[b][0].Generate('foo', 1))
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| 179 | self.assertEqual('dummy', cfg.facts[b][0].name())
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| 180 | self.assertEqual(2, len(cfg.facts[d]))
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| 181 | self.assertEqual('bar,1,99', cfg.facts[d][0].Generate('bar', 1))
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| 182 | self.assertEqual('bar,2,7', cfg.facts[d][1].Generate('bar', 2))
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| 183 |
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| 184 | def testBranches(self):
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| 185 | cfg = pass_state.ControlFlowGraph()
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| 186 |
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| 187 | main0 = cfg.AddStatement()
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| 188 |
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| 189 | # branch condition facts all get attached to this statement
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| 190 | branch_point = cfg.AddStatement()
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| 191 |
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| 192 | # first statement in if block
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| 193 | with pass_state.CfgBranchContext(cfg, branch_point) as branch_ctx:
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| 194 | with branch_ctx.AddBranch() as arm0:
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| 195 | arm0_a = cfg.AddStatement() # block statement 2
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| 196 | arm0_b = cfg.AddStatement() # block statement 2
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| 197 | arm0_c = cfg.AddStatement() # block statement 3
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| 198 |
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| 199 | # frist statement in elif block
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| 200 | with branch_ctx.AddBranch() as arm1:
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| 201 | arm1_a = cfg.AddStatement()
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| 202 | arm1_b = cfg.AddStatement() # block statement 2
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| 203 |
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| 204 | # frist statement in else block
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| 205 | with branch_ctx.AddBranch() as arm2:
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| 206 | arm2_a = cfg.AddStatement()
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| 207 | arm2_b = cfg.AddStatement() # block statement 2
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| 208 |
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| 209 | self.assertEqual(arm0_c, arm0.exit)
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| 210 | self.assertEqual(arm1_b, arm1.exit)
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| 211 | self.assertEqual(arm2_b, arm2.exit)
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| 212 |
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| 213 | join = cfg.AddStatement()
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| 214 | end = cfg.AddStatement()
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| 215 | """
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| 216 | We expecte a graph like this.
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| 217 |
|
| 218 | begin
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| 219 | |
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| 220 | main0
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| 221 | |
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| 222 | v
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| 223 | branch_point
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| 224 | / | \
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| 225 | arm0_a arm1_a arm2_a
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| 226 | | | |
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| 227 | arm0_b arm1_b arm2_b
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| 228 | | | |
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| 229 | arm0_c | |
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| 230 | | | /
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| 231 | \ | /
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| 232 | \ | /
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| 233 | \ | /
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| 234 | \ | /
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| 235 | join
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| 236 | |
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| 237 | end
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| 238 | """
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| 239 | # yapf: disable
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| 240 | expected_edges = {
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| 241 | (0, main0),
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| 242 | (main0, branch_point),
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| 243 | (branch_point, arm0_a), (branch_point, arm1_a), (branch_point, arm2_a),
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| 244 | (arm0_a, arm0_b), (arm0_b, arm0_c),
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| 245 | (arm1_a, arm1_b),
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| 246 | (arm2_a, arm2_b),
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| 247 | (arm0_c, join), (arm1_b, join), (arm2_b, join),
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| 248 | (join, end),
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| 249 | }
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| 250 | # yapf: enable
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| 251 | self.assertEqual(expected_edges, cfg.edges)
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| 252 |
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| 253 | def testDeadends(self):
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| 254 | """
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| 255 | Make sure we don't create orphans in the presence of continue, return,
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| 256 | raise, etc...
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| 257 | """
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| 258 |
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| 259 | cfg = pass_state.ControlFlowGraph()
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| 260 | with pass_state.CfgBranchContext(cfg,
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| 261 | cfg.AddStatement()) as branch_ctx:
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| 262 | with branch_ctx.AddBranch() as branchA: # if
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| 263 | ret = cfg.AddStatement() # return
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| 264 | cfg.AddDeadend(ret)
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| 265 | """
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| 266 | while ...:
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| 267 | if ...:
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| 268 | continue
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| 269 | else:
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| 270 | print(...)
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| 271 |
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| 272 | print(...)
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| 273 | """
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| 274 | with pass_state.CfgLoopContext(cfg) as loop:
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| 275 | branch_point = cfg.AddStatement()
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| 276 | with pass_state.CfgBranchContext(cfg, branch_point) as branch_ctx:
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| 277 | with branch_ctx.AddBranch() as branchB: # if
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| 278 | cont = cfg.AddStatement() # continue
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| 279 | loop.AddContinue(cont)
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| 280 |
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| 281 | with branch_ctx.AddBranch() as branchC: # else
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| 282 | innerC = cfg.AddStatement()
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| 283 |
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| 284 | end = cfg.AddStatement()
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| 285 | # yapf: disable
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| 286 | expected_edges = {
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| 287 | (0, branchA.entry),
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| 288 | (branchA.entry, ret),
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| 289 | (branchA.entry, loop.entry),
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| 290 | (loop.entry, branchB.entry),
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| 291 | (branch_point, cont),
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| 292 | (cont, loop.entry),
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| 293 | (branch_point, innerC),
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| 294 | (innerC, end),
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| 295 | (innerC, loop.entry),
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| 296 | }
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| 297 | # yapf: enable
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| 298 | self.assertEqual(expected_edges, cfg.edges)
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| 299 |
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| 300 | def testNedstedIf(self):
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| 301 | """
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| 302 | The mypy AST represents else-if as nested if-statements inside the else arm.
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| 303 | """
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| 304 | cfg = pass_state.ControlFlowGraph()
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| 305 |
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| 306 | outer_branch_point = cfg.AddStatement()
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| 307 | with pass_state.CfgBranchContext(cfg,
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| 308 | outer_branch_point) as branch_ctx:
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| 309 | with branch_ctx.AddBranch() as branch0: # if
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| 310 | branch0_a = cfg.AddStatement()
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| 311 |
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| 312 | with branch_ctx.AddBranch() as branch1: # else
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| 313 | with branch1.AddBranch(cfg.AddStatement()) as branch2: # if
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| 314 | branch2_a = cfg.AddStatement()
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| 315 |
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| 316 | branch1_a = cfg.AddStatement()
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| 317 |
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| 318 | end = cfg.AddStatement()
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| 319 | """
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| 320 | We expect a graph like this.
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| 321 |
|
| 322 | begin
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| 323 | |
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| 324 | outer_branch_point +------
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| 325 | | | \
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| 326 | branch0_a | branch2.entry
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| 327 | | | |
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| 328 | | | branch2_a
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| 329 | | | |
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| 330 | | | /
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| 331 | | | /
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| 332 | | | /
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| 333 | | branch1_a
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| 334 | | /
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| 335 | | /
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| 336 | | /
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| 337 | | /
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| 338 | end _____/
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| 339 | """
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| 340 | # yapf: disable
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| 341 | expected_edges = {
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| 342 | (0, outer_branch_point),
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| 343 | (outer_branch_point, branch0_a),
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| 344 | (outer_branch_point, branch2.entry),
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| 345 | (branch2.entry, branch2_a),
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| 346 | (branch2_a, branch1_a),
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| 347 | (branch0.exit, end),
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| 348 | (branch1.exit, end),
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| 349 | (branch2.exit, end),
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| 350 | }
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| 351 | # yapf: enable
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| 352 | self.assertEqual(expected_edges, cfg.edges)
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| 353 |
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| 354 | def testLoops(self):
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| 355 | cfg = pass_state.ControlFlowGraph()
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| 356 |
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| 357 | with pass_state.CfgLoopContext(cfg) as loopA:
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| 358 | branch_point = cfg.AddStatement()
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| 359 | with pass_state.CfgBranchContext(cfg, branch_point) as branch_ctx:
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| 360 | with branch_ctx.AddBranch() as arm0:
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| 361 | arm0_a = cfg.AddStatement()
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| 362 | arm0_b = cfg.AddStatement()
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| 363 |
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| 364 | with branch_ctx.AddBranch() as arm1:
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| 365 | arm1_a = cfg.AddStatement()
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| 366 | arm1_b = cfg.AddStatement()
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| 367 |
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| 368 | self.assertEqual(arm0_b, arm0.exit)
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| 369 | self.assertEqual(arm1_b, arm1.exit)
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| 370 |
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| 371 | with pass_state.CfgLoopContext(cfg) as loopB:
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| 372 | innerB = cfg.AddStatement()
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| 373 |
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| 374 | self.assertEqual(innerB, loopB.exit)
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| 375 |
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| 376 | end = cfg.AddStatement()
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| 377 | """
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| 378 | We expecte a graph like this:.
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| 379 |
|
| 380 | begin
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| 381 | |
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| 382 | loopA <------+
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| 383 | | |
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| 384 | v |
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| 385 | branch_point |
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| 386 | / \ |
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| 387 | arm0_a arm2_a |
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| 388 | | | |
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| 389 | arm0_b arm2_b |
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| 390 | \ / |
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| 391 | \ / |
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| 392 | loopB <-+ |
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| 393 | | | |
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| 394 | innerB -+---+
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| 395 | |
|
| 396 | end
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| 397 | """
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| 398 | # yapf: disable
|
| 399 | expected_edges = {
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| 400 | (0, loopA.entry),
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| 401 | (loopA.entry, branch_point),
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| 402 | (branch_point, arm0_a), (branch_point, arm1_a),
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| 403 | (arm0_a, arm0_b),
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| 404 | (arm1_a, arm1_b),
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| 405 | (arm0_b, loopB.entry), (arm1_b, loopB.entry),
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| 406 | (loopB.entry, innerB),
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| 407 | (innerB, loopA.entry), (innerB, loopB.entry),
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| 408 | (innerB, end),
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| 409 | }
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| 410 | # yapf: enable
|
| 411 | self.assertEqual(expected_edges, cfg.edges)
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| 412 |
|
| 413 | def testLoops2(self):
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| 414 | cfg = pass_state.ControlFlowGraph()
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| 415 |
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| 416 | with pass_state.CfgLoopContext(cfg) as loopA:
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| 417 | with pass_state.CfgLoopContext(cfg) as loopB:
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| 418 | innerB = cfg.AddStatement()
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| 419 |
|
| 420 | innerA = cfg.AddStatement()
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| 421 |
|
| 422 | end = cfg.AddStatement()
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| 423 |
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| 424 | # yapf: disable
|
| 425 | expected_edges = {
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| 426 | (0, loopA.entry),
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| 427 | (loopA.entry, loopB.entry),
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| 428 | (loopB.entry, innerB),
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| 429 | (innerB, innerA),
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| 430 | (innerB, loopB.entry),
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| 431 | (innerA, loopA.entry),
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| 432 | (innerA, end),
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| 433 | }
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| 434 | # yapf: enable
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| 435 | self.assertEqual(expected_edges, cfg.edges)
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| 436 |
|
| 437 | def testDeepTry(self):
|
| 438 | """
|
| 439 | A code snippet like the following.
|
| 440 |
|
| 441 | 1 while i < n:
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| 442 | 2 for prog in cases:
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| 443 | 3 try:
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| 444 | 4 result = f(prog)
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| 445 | except ParseError as e:
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| 446 | 5 num_exceptions += 1
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| 447 | 6 continue
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| 448 | 7 i += 1
|
| 449 |
|
| 450 | 8 mylib.MaybeCollect() # manual GC point
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| 451 |
|
| 452 | 9 log('num_exceptions = %d', num_exceptions)
|
| 453 | """
|
| 454 | cfg = pass_state.ControlFlowGraph()
|
| 455 |
|
| 456 | with pass_state.CfgLoopContext(cfg) as loopA:
|
| 457 | with pass_state.CfgLoopContext(cfg) as loopB:
|
| 458 | with pass_state.CfgBlockContext(cfg) as try_block:
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| 459 | try_s0 = cfg.AddStatement()
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| 460 |
|
| 461 | with pass_state.CfgBlockContext(
|
| 462 | cfg, try_block.exit) as except_block:
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| 463 | except_s0 = cfg.AddStatement()
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| 464 | cont = cfg.AddStatement()
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| 465 | loopB.AddContinue(cont)
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| 466 |
|
| 467 | a_s0 = cfg.AddStatement()
|
| 468 | a_s1 = cfg.AddStatement()
|
| 469 |
|
| 470 | log_stmt = cfg.AddStatement()
|
| 471 | end = cfg.AddStatement()
|
| 472 |
|
| 473 | # yapf: disable
|
| 474 | expected_edges = {
|
| 475 | (0, loopA.entry),
|
| 476 | (loopA.entry, loopB.entry),
|
| 477 | (loopB.entry, try_block.entry),
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| 478 | (try_block.entry, try_s0),
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| 479 | (try_s0, except_s0),
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| 480 | (try_s0, loopB.entry),
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| 481 | (except_s0, cont),
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| 482 | (cont, loopB.entry),
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| 483 | (try_block.exit, a_s0),
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| 484 | (a_s0, a_s1),
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| 485 | (a_s1, loopA.entry),
|
| 486 | (a_s1, log_stmt),
|
| 487 | (log_stmt, end),
|
| 488 | }
|
| 489 | # yapf: enable
|
| 490 | self.assertEqual(expected_edges, cfg.edges)
|
| 491 |
|
| 492 | def testLoopWithDanglingBlocks(self):
|
| 493 | """
|
| 494 | for i in xrange(1000000):
|
| 495 | try:
|
| 496 | with ctx_DirStack(d, 'foo') as _:
|
| 497 | if i % 10000 == 0:
|
| 498 | raise MyError()
|
| 499 | pass
|
| 500 | except MyError:
|
| 501 | log('exception')
|
| 502 | """
|
| 503 | cfg = pass_state.ControlFlowGraph()
|
| 504 |
|
| 505 | with pass_state.CfgLoopContext(cfg) as loop:
|
| 506 | with pass_state.CfgBranchContext(cfg,
|
| 507 | cfg.AddStatement()) as try_ctx:
|
| 508 | with try_ctx.AddBranch() as try_block:
|
| 509 | with pass_state.CfgBlockContext(
|
| 510 | cfg, cfg.AddStatement()) as with_block:
|
| 511 | with pass_state.CfgBranchContext(
|
| 512 | cfg, cfg.AddStatement()) as if_ctx:
|
| 513 | with if_ctx.AddBranch() as if_block:
|
| 514 | s_raise = cfg.AddStatement()
|
| 515 | cfg.AddDeadend(s_raise)
|
| 516 |
|
| 517 | pass_stmt = cfg.AddStatement()
|
| 518 |
|
| 519 | with try_ctx.AddBranch(try_block.exit) as except_block:
|
| 520 | log_stmt = cfg.AddStatement()
|
| 521 |
|
| 522 | # yapf: disable
|
| 523 | expected_edges = {
|
| 524 | (0, loop.entry),
|
| 525 | (loop.entry, try_block.entry),
|
| 526 | (try_block.entry, with_block.entry),
|
| 527 | (with_block.entry, if_block.entry),
|
| 528 | (if_block.entry, s_raise),
|
| 529 | (if_block.entry, pass_stmt),
|
| 530 | (pass_stmt, loop.entry),
|
| 531 | (pass_stmt, log_stmt),
|
| 532 | (log_stmt, loop.entry),
|
| 533 | }
|
| 534 | # yapf: enable
|
| 535 | self.assertEqual(expected_edges, cfg.edges)
|
| 536 |
|
| 537 | def testLoopBreak(self):
|
| 538 | """
|
| 539 | while ...:
|
| 540 | if ...:
|
| 541 | break
|
| 542 |
|
| 543 | else:
|
| 544 | try:
|
| 545 | pass
|
| 546 |
|
| 547 | except ...:
|
| 548 | break
|
| 549 |
|
| 550 | pass
|
| 551 |
|
| 552 | pass
|
| 553 | """
|
| 554 | cfg = pass_state.ControlFlowGraph()
|
| 555 |
|
| 556 | with pass_state.CfgLoopContext(cfg) as loop:
|
| 557 | with pass_state.CfgBranchContext(cfg,
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| 558 | cfg.AddStatement()) as if_ctx:
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| 559 | with if_ctx.AddBranch() as if_block:
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| 560 | break1 = cfg.AddStatement()
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| 561 | loop.AddBreak(break1)
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| 562 |
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| 563 | with if_ctx.AddBranch() as else_block:
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| 564 | with pass_state.CfgBranchContext(
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| 565 | cfg, cfg.AddStatement()) as try_ctx:
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| 566 | with try_ctx.AddBranch() as try_block:
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| 567 | pass1 = cfg.AddStatement()
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| 568 |
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| 569 | with try_ctx.AddBranch(try_block.exit) as except_block:
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| 570 | break2 = cfg.AddStatement()
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| 571 | loop.AddBreak(break2)
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| 572 |
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| 573 | pass2 = cfg.AddStatement()
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| 574 |
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| 575 | pass3 = cfg.AddStatement()
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| 576 |
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| 577 | # yapf: disable
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| 578 | expected_edges = {
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| 579 | (0, loop.entry),
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| 580 | (loop.entry, if_block.entry),
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| 581 | (if_block.entry, break1),
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| 582 | (if_block.entry, try_block.entry),
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| 583 | (try_block.entry, pass1),
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| 584 | (pass1, break2),
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| 585 | (pass1, pass2),
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| 586 | (pass2, loop.entry),
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| 587 | (pass2, pass3),
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| 588 | (break1, pass3),
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| 589 | (break2, pass3),
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| 590 | }
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| 591 | # yapf: enable
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| 592 | self.assertEqual(expected_edges, cfg.edges)
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| 593 |
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| 594 |
|
| 595 | if __name__ == '__main__':
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| 596 | unittest.main()
|