mirror of https://github.com/python/cpython
115 lines
3.3 KiB
Python
115 lines
3.3 KiB
Python
import dis
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import sys
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from cStringIO import StringIO
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import unittest
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def disassemble(func):
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f = StringIO()
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tmp = sys.stdout
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sys.stdout = f
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dis.dis(func)
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sys.stdout = tmp
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result = f.getvalue()
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f.close()
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return result
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def dis_single(line):
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return disassemble(compile(line, '', 'single'))
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class TestTranforms(unittest.TestCase):
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def test_unot(self):
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# UNARY_NOT JUMP_IF_FALSE POP_TOP --> JUMP_IF_TRUE POP_TOP'
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def unot(x):
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if not x == 2:
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del x
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asm = disassemble(unot)
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for elem in ('UNARY_NOT', 'JUMP_IF_FALSE'):
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self.assert_(elem not in asm)
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for elem in ('JUMP_IF_TRUE', 'POP_TOP'):
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self.assert_(elem in asm)
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def test_elim_inversion_of_is_or_in(self):
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for line, elem in (
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('not a is b', '(is not)',),
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('not a in b', '(not in)',),
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('not a is not b', '(is)',),
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('not a not in b', '(in)',),
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):
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asm = dis_single(line)
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self.assert_(elem in asm)
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def test_none_as_constant(self):
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# LOAD_GLOBAL None --> LOAD_CONST None
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def f(x):
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None
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return x
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asm = disassemble(f)
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for elem in ('LOAD_GLOBAL',):
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self.assert_(elem not in asm)
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for elem in ('LOAD_CONST', '(None)'):
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self.assert_(elem in asm)
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def test_while_one(self):
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# Skip over: LOAD_CONST trueconst JUMP_IF_FALSE xx POP_TOP
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def f():
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while 1:
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pass
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return list
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asm = disassemble(f)
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for elem in ('LOAD_CONST', 'JUMP_IF_FALSE'):
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self.assert_(elem not in asm)
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for elem in ('JUMP_ABSOLUTE',):
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self.assert_(elem in asm)
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def test_pack_unpack(self):
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for line, elem in (
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('a, = a,', 'LOAD_CONST',),
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('a, b = a, b', 'ROT_TWO',),
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('a, b, c = a, b, c', 'ROT_THREE',),
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):
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asm = dis_single(line)
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self.assert_(elem in asm)
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self.assert_('BUILD_TUPLE' not in asm)
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self.assert_('UNPACK_TUPLE' not in asm)
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def test_folding_of_tuples_of_constants(self):
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for line, elem in (
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('a = 1,2,3', '((1, 2, 3))',),
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('("a","b","c")', "(('a', 'b', 'c'))",),
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('a,b,c = 1,2,3', '((1, 2, 3))',),
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):
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asm = dis_single(line)
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self.assert_(elem in asm)
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self.assert_('BUILD_TUPLE' not in asm)
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def test_elim_extra_return(self):
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# RETURN LOAD_CONST None RETURN --> RETURN
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def f(x):
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return x
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asm = disassemble(f)
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self.assert_('LOAD_CONST' not in asm)
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self.assert_('(None)' not in asm)
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self.assertEqual(asm.split().count('RETURN_VALUE'), 1)
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def test_main(verbose=None):
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import sys
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from test import test_support
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test_classes = (TestTranforms,)
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test_support.run_unittest(*test_classes)
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# verify reference counting
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if verbose and hasattr(sys, "gettotalrefcount"):
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import gc
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counts = [None] * 5
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for i in xrange(len(counts)):
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test_support.run_unittest(*test_classes)
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gc.collect()
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counts[i] = sys.gettotalrefcount()
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print counts
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if __name__ == "__main__":
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test_main(verbose=True)
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