1#!/usr/bin/env python3
2# SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
3import unittest
4from metric import Constant
5from metric import Event
6from metric import Expression
7from metric import ParsePerfJson
8from metric import RewriteMetricsInTermsOfOthers
9
10
11class TestMetricExpressions(unittest.TestCase):
12
13  def test_Operators(self):
14    a = Event('a')
15    b = Event('b')
16    self.assertEqual((a | b).ToPerfJson(), 'a | b')
17    self.assertEqual((a ^ b).ToPerfJson(), 'a ^ b')
18    self.assertEqual((a & b).ToPerfJson(), 'a & b')
19    self.assertEqual((a < b).ToPerfJson(), 'a < b')
20    self.assertEqual((a > b).ToPerfJson(), 'a > b')
21    self.assertEqual((a + b).ToPerfJson(), 'a + b')
22    self.assertEqual((a - b).ToPerfJson(), 'a - b')
23    self.assertEqual((a * b).ToPerfJson(), 'a * b')
24    self.assertEqual((a / b).ToPerfJson(), 'a / b')
25    self.assertEqual((a % b).ToPerfJson(), 'a % b')
26    one = Constant(1)
27    self.assertEqual((a + one).ToPerfJson(), 'a + 1')
28
29  def test_Brackets(self):
30    a = Event('a')
31    b = Event('b')
32    c = Event('c')
33    self.assertEqual((a * b + c).ToPerfJson(), 'a * b + c')
34    self.assertEqual((a + b * c).ToPerfJson(), 'a + b * c')
35    self.assertEqual(((a + a) + a).ToPerfJson(), 'a + a + a')
36    self.assertEqual(((a + b) * c).ToPerfJson(), '(a + b) * c')
37    self.assertEqual((a + (b * c)).ToPerfJson(), 'a + b * c')
38    self.assertEqual(((a / b) * c).ToPerfJson(), 'a / b * c')
39    self.assertEqual((a / (b * c)).ToPerfJson(), 'a / (b * c)')
40
41  def test_ParsePerfJson(self):
42    # Based on an example of a real metric.
43    before = '(a + b + c + d) / (2 * e)'
44    after = before
45    self.assertEqual(ParsePerfJson(before).ToPerfJson(), after)
46
47    # Parsing should handle events with '-' in their name. Note, in
48    # the json file the '\' are doubled to '\\'.
49    before = r'topdown\-fe\-bound / topdown\-slots - 1'
50    after = before
51    self.assertEqual(ParsePerfJson(before).ToPerfJson(), after)
52
53    # Parsing should handle escaped modifiers. Note, in the json file
54    # the '\' are doubled to '\\'.
55    before = r'arb@event\=0x81\,umask\=0x1@ + arb@event\=0x84\,umask\=0x1@'
56    after = before
57    self.assertEqual(ParsePerfJson(before).ToPerfJson(), after)
58
59    # Parsing should handle exponents in numbers.
60    before = r'a + 1e12 + b'
61    after = before
62    self.assertEqual(ParsePerfJson(before).ToPerfJson(), after)
63
64  def test_IfElseTests(self):
65    # if-else needs rewriting to Select and back.
66    before = r'Event1 if #smt_on else Event2'
67    after = f'({before})'
68    self.assertEqual(ParsePerfJson(before).ToPerfJson(), after)
69
70    before = r'Event1 if 0 else Event2'
71    after = f'({before})'
72    self.assertEqual(ParsePerfJson(before).ToPerfJson(), after)
73
74    before = r'Event1 if 1 else Event2'
75    after = f'({before})'
76    self.assertEqual(ParsePerfJson(before).ToPerfJson(), after)
77
78    # Ensure the select is evaluate last.
79    before = r'Event1 + 1 if Event2 < 2 else Event3 + 3'
80    after = (r'Select(Event(r"Event1") + Constant(1), Event(r"Event2") < '
81             r'Constant(2), Event(r"Event3") + Constant(3))')
82    self.assertEqual(ParsePerfJson(before).ToPython(), after)
83
84    before = r'Event1 > 1 if Event2 < 2 else Event3 > 3'
85    after = (r'Select(Event(r"Event1") > Constant(1), Event(r"Event2") < '
86             r'Constant(2), Event(r"Event3") > Constant(3))')
87    self.assertEqual(ParsePerfJson(before).ToPython(), after)
88
89    before = r'min(a + b if c > 1 else c + d, e + f)'
90    after = r'min((a + b if c > 1 else c + d), e + f)'
91    self.assertEqual(ParsePerfJson(before).ToPerfJson(), after)
92
93    before = r'a if b else c if d else e'
94    after = r'(a if b else (c if d else e))'
95    self.assertEqual(ParsePerfJson(before).ToPerfJson(), after)
96
97  def test_ToPython(self):
98    # pylint: disable=eval-used
99    # Based on an example of a real metric.
100    before = '(a + b + c + d) / (2 * e)'
101    py = ParsePerfJson(before).ToPython()
102    after = eval(py).ToPerfJson()
103    self.assertEqual(before, after)
104
105  def test_Simplify(self):
106    before = '1 + 2 + 3'
107    after = '6'
108    self.assertEqual(ParsePerfJson(before).Simplify().ToPerfJson(), after)
109
110    before = 'a + 0'
111    after = 'a'
112    self.assertEqual(ParsePerfJson(before).Simplify().ToPerfJson(), after)
113
114    before = '0 + a'
115    after = 'a'
116    self.assertEqual(ParsePerfJson(before).Simplify().ToPerfJson(), after)
117
118    before = 'a | 0'
119    after = 'a'
120    self.assertEqual(ParsePerfJson(before).Simplify().ToPerfJson(), after)
121
122    before = '0 | a'
123    after = 'a'
124    self.assertEqual(ParsePerfJson(before).Simplify().ToPerfJson(), after)
125
126    before = 'a * 0'
127    after = '0'
128    self.assertEqual(ParsePerfJson(before).Simplify().ToPerfJson(), after)
129
130    before = '0 * a'
131    after = '0'
132    self.assertEqual(ParsePerfJson(before).Simplify().ToPerfJson(), after)
133
134    before = 'a * 1'
135    after = 'a'
136    self.assertEqual(ParsePerfJson(before).Simplify().ToPerfJson(), after)
137
138    before = '1 * a'
139    after = 'a'
140    self.assertEqual(ParsePerfJson(before).Simplify().ToPerfJson(), after)
141
142    before = 'a if 0 else b'
143    after = 'b'
144    self.assertEqual(ParsePerfJson(before).Simplify().ToPerfJson(), after)
145
146    before = 'a if 1 else b'
147    after = 'a'
148    self.assertEqual(ParsePerfJson(before).Simplify().ToPerfJson(), after)
149
150    before = 'a if b else a'
151    after = 'a'
152    self.assertEqual(ParsePerfJson(before).Simplify().ToPerfJson(), after)
153
154    # Pattern used to add a slots event to metrics that require it.
155    before = '0 * SLOTS'
156    after = '0 * SLOTS'
157    self.assertEqual(ParsePerfJson(before).Simplify().ToPerfJson(), after)
158
159  def test_RewriteMetricsInTermsOfOthers(self):
160    Expression.__eq__ = lambda e1, e2: e1.Equals(e2)
161    before = [('cpu', 'm1', ParsePerfJson('a + b + c + d')),
162              ('cpu', 'm2', ParsePerfJson('a + b + c'))]
163    after = {('cpu', 'm1'): ParsePerfJson('m2 + d')}
164    self.assertEqual(RewriteMetricsInTermsOfOthers(before), after)
165    Expression.__eq__ = None
166
167if __name__ == '__main__':
168  unittest.main()
169