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43 lines
1.6 KiB
43 lines
1.6 KiB
"""bytecode_helper - support tools for testing correct bytecode generation"""
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import unittest
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import dis
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import io
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_UNSPECIFIED = object()
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class BytecodeTestCase(unittest.TestCase):
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"""Custom assertion methods for inspecting bytecode."""
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def get_disassembly_as_string(self, co):
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s = io.StringIO()
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dis.dis(co, file=s)
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return s.getvalue()
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def assertInBytecode(self, x, opname, argval=_UNSPECIFIED):
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"""Returns instr if opname is found, otherwise throws AssertionError"""
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for instr in dis.get_instructions(x):
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if instr.opname == opname:
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if argval is _UNSPECIFIED or instr.argval == argval:
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return instr
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disassembly = self.get_disassembly_as_string(x)
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if argval is _UNSPECIFIED:
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msg = '%s not found in bytecode:\n%s' % (opname, disassembly)
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else:
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msg = '(%s,%r) not found in bytecode:\n%s'
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msg = msg % (opname, argval, disassembly)
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self.fail(msg)
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def assertNotInBytecode(self, x, opname, argval=_UNSPECIFIED):
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"""Throws AssertionError if opname is found"""
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for instr in dis.get_instructions(x):
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if instr.opname == opname:
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disassembly = self.get_disassembly_as_string(x)
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if argval is _UNSPECIFIED:
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msg = '%s occurs in bytecode:\n%s' % (opname, disassembly)
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self.fail(msg)
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elif instr.argval == argval:
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msg = '(%s,%r) occurs in bytecode:\n%s'
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msg = msg % (opname, argval, disassembly)
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self.fail(msg)
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