@@ -63,6 +63,30 @@ def test_argument_handling(self):
6363 self .assertRaises (SyntaxError , exec , 'def f(a = 0, a = 1): pass' )
6464 self .assertRaises (SyntaxError , exec , 'def f(a): global a; a = 1' )
6565
66+ def test_call_opcode_stack_use_limit (self ):
67+ def get_call_opcode (positional_count , keyword_count ):
68+ args = ["0" ] * positional_count
69+ args .extend (f"a{ i } for i in range (keyword_count ))
70+ code = compile (f"f({ ', ' .join (args )} , "<test>" , "exec" )
71+ return next (
72+ instr .opname for instr in dis .get_instructions (code )
73+ if instr .opname .startswith ("CALL" )
74+ )
75+
76+ for positional_count , keyword_count , expected_opcode in [
77+ (0 , 16 , "CALL_KW" ),
78+ (15 , 14 , "CALL_KW" ),
79+ (15 , 15 , "CALL_FUNCTION_EX" ),
80+ ]:
81+ with self .subTest (
82+ positional_count = positional_count ,
83+ keyword_count = keyword_count ,
84+ ):
85+ self .assertEqual (
86+ get_call_opcode (positional_count , keyword_count ),
87+ expected_opcode ,
88+ )
89+
6690 def test_syntax_error (self ):
6791 self .assertRaises (SyntaxError , compile , "1+*3" , "filename" , "exec" )
6892
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