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e2f710792b
* Detect source file encoding. * Use the "replace" error handler even for UTF-8 (default) encoding. * Remove the BOM. * Fix detection of too long lines if they contain NUL. * Return the head rather than the tail for truncated long lines.
159 lines
5.2 KiB
Python
159 lines
5.2 KiB
Python
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import textwrap
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from test.support.bytecode_helper import CodegenTestCase
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# Tests for the code-generation stage of the compiler.
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# Examine the un-optimized code generated from the AST.
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class IsolatedCodeGenTests(CodegenTestCase):
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def assertInstructionsMatch_recursive(self, insts, expected_insts):
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expected_nested = [i for i in expected_insts if isinstance(i, list)]
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expected_insts = [i for i in expected_insts if not isinstance(i, list)]
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self.assertInstructionsMatch(insts, expected_insts)
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self.assertEqual(len(insts.get_nested()), len(expected_nested))
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for n_insts, n_expected in zip(insts.get_nested(), expected_nested):
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self.assertInstructionsMatch_recursive(n_insts, n_expected)
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def codegen_test(self, snippet, expected_insts):
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import ast
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a = ast.parse(snippet, "my_file.py", "exec")
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insts = self.generate_code(a)
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self.assertInstructionsMatch_recursive(insts, expected_insts)
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def test_if_expression(self):
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snippet = "42 if True else 24"
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false_lbl = self.Label()
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expected = [
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('RESUME', 0, 0),
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('LOAD_CONST', 0, 1),
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('TO_BOOL', 0, 1),
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('POP_JUMP_IF_FALSE', false_lbl := self.Label(), 1),
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('LOAD_CONST', 1, 1),
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('JUMP_NO_INTERRUPT', exit_lbl := self.Label()),
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false_lbl,
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('LOAD_CONST', 2, 1),
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exit_lbl,
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('POP_TOP', None),
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('LOAD_CONST', 3),
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('RETURN_VALUE', None),
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]
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self.codegen_test(snippet, expected)
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def test_for_loop(self):
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snippet = "for x in l:\n\tprint(x)"
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false_lbl = self.Label()
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expected = [
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('RESUME', 0, 0),
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('LOAD_NAME', 0, 1),
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('GET_ITER', None, 1),
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loop_lbl := self.Label(),
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('FOR_ITER', exit_lbl := self.Label(), 1),
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('NOP', None, 1, 1),
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('STORE_NAME', 1, 1),
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('LOAD_NAME', 2, 2),
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('PUSH_NULL', None, 2),
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('LOAD_NAME', 1, 2),
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('CALL', 1, 2),
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('POP_TOP', None),
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('JUMP', loop_lbl),
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exit_lbl,
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('END_FOR', None),
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('POP_TOP', None),
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('LOAD_CONST', 0),
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('RETURN_VALUE', None),
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]
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self.codegen_test(snippet, expected)
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def test_function(self):
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snippet = textwrap.dedent("""
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def f(x):
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return x + 42
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""")
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expected = [
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# Function definition
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('RESUME', 0),
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('LOAD_CONST', 0),
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('MAKE_FUNCTION', None),
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('STORE_NAME', 0),
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('LOAD_CONST', 1),
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('RETURN_VALUE', None),
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[
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# Function body
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('RESUME', 0),
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('LOAD_FAST', 0),
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('LOAD_CONST', 1),
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('BINARY_OP', 0),
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('RETURN_VALUE', None),
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('LOAD_CONST', 0),
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('RETURN_VALUE', None),
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]
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]
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self.codegen_test(snippet, expected)
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def test_nested_functions(self):
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snippet = textwrap.dedent("""
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def f():
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def h():
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return 12
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def g():
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x = 1
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y = 2
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z = 3
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u = 4
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return 42
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""")
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expected = [
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# Function definition
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('RESUME', 0),
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('LOAD_CONST', 0),
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('MAKE_FUNCTION', None),
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('STORE_NAME', 0),
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('LOAD_CONST', 1),
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('RETURN_VALUE', None),
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[
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# Function body
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('RESUME', 0),
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('LOAD_CONST', 1),
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('MAKE_FUNCTION', None),
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('STORE_FAST', 0),
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('LOAD_CONST', 2),
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('MAKE_FUNCTION', None),
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('STORE_FAST', 1),
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('LOAD_CONST', 0),
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('RETURN_VALUE', None),
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[
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('RESUME', 0),
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('NOP', None),
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('LOAD_CONST', 1),
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('RETURN_VALUE', None),
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('LOAD_CONST', 0),
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('RETURN_VALUE', None),
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],
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[
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('RESUME', 0),
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('LOAD_CONST', 1),
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('STORE_FAST', 0),
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('LOAD_CONST', 2),
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('STORE_FAST', 1),
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('LOAD_CONST', 3),
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('STORE_FAST', 2),
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('LOAD_CONST', 4),
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('STORE_FAST', 3),
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('NOP', None),
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('LOAD_CONST', 5),
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('RETURN_VALUE', None),
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('LOAD_CONST', 0),
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('RETURN_VALUE', None),
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],
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],
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]
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self.codegen_test(snippet, expected)
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def test_syntax_error__return_not_in_function(self):
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snippet = "return 42"
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with self.assertRaisesRegex(SyntaxError, "'return' outside function") as cm:
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self.codegen_test(snippet, None)
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self.assertIsNone(cm.exception.text)
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self.assertEqual(cm.exception.offset, 1)
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self.assertEqual(cm.exception.end_offset, 10)
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