Added/Updated tests\bugs\gh_8255_test.py: Checked on 6.0.0.466, 5.0.2.1513, 4.0.6.3156

tests/bugs/gh_8255_test.py

@@ -0,0 +1,54 @@
+#coding:utf-8
+
+"""
+ID:          issue-8255
+ISSUE:       https://github.com/FirebirdSQL/firebird/issues/8255
+TITLE:       Catch possible stack overflow when preparing and compiling user statements
+DESCRIPTION:
+    Test generates SQL like 'select 1+1+1....+1 from rdb$database' and tries to execte it.
+    Exception 'SQLSTATE = HY001 / Stack overflow' must raise instead of crash (that was before fix).
+    Commits:
+    * 4.x: https://github.com/FirebirdSQL/firebird/commit/04c586d4ea4bafb50818bcf7f46188afc67ab1c5 (20-sep-2024)
+    * 5.x: https://github.com/FirebirdSQL/firebird/commit/f0670f90cc7d1fc93db22336fd43abc6d348e31e (18-sep-2024)
+    * 6.x: https://github.com/FirebirdSQL/firebird/commit/6b445c0dc53f1c5778258bd673c0b61f6dd93a69 (20-sep-2024)
+NOTES:
+    [23.09.2024] pzotov
+    Initially query containing 15'000 terms in "+1+1...+1" expression used to check.
+    This query causes 'stack overflow' only in FB 5.x and 6.x.
+    But in FB 4.0.6.3156 it successfully COMPLETES calculation and issues result.
+    For FB 4.x this 'threshold' is 16'287 (last number of terms where FB can evaluate result w/o 'stack overflow').
+    Because of this, it was decided to increase number of terms to 50'000.
+
+    Checked on 6.0.0.466, 5.0.2.1513, 4.0.6.3156
+"""
+
+from pathlib import Path
+
+import pytest
+from firebird.qa import *
+
+db = db_factory()
+act = python_act('db', substitutions=[('[ \t]+', ' '), ('After line \\d+.*', '')])
+
+tmp_sql = temp_file('tmp_8255_non_ascii_ddl.sql')
+
+@pytest.mark.version('>=4.0.6')
+def test_1(act: Action, tmp_sql: Path, capsys):
+
+    long_expr = '\n'.join( (
+                              'select'
+                             ,'+'.join( ('1') * 100000 )
+                             ,'from rdb$database;'
+                           )
+                         )
+
+    tmp_sql.write_bytes(long_expr.encode('utf-8'))
+
+    act.isql(switches=['-q'], input_file=tmp_sql, combine_output = True, charset='win1251')
+
+    act.expected_stdout = f"""
+        Statement failed, SQLSTATE = HY001
+        Stack overflow. The resource requirements of the runtime stack have exceeded the memory available to it.
+    """
+    assert act.clean_stdout == act.clean_expected_stdout
+