tests/stress: Add test for maximum length limit of qstrs.

tests/stress/qstr_limit.py

+# Test interning qstrs that go over the limit of the maximum qstr length
+# (which is 255 bytes for the default configuration)
+
+def make_id(n, base='a'):
+    return ''.join(chr(ord(base) + i % 26) for i in range(n))
+
+# identifiers in parser
+for l in range(254, 259):
+    g = {}
+    var = make_id(l)
+    try:
+        exec(var + '=1', g)
+    except RuntimeError:
+        print('RuntimeError', l)
+        continue
+    print(var in g)
+
+# calling a function with kwarg
+def f(**k):
+    print(k)
+for l in range(254, 259):
+    try:
+        exec('f({}=1)'.format(make_id(l)))
+    except RuntimeError:
+        print('RuntimeError', l)
+
+# type construction
+for l in range(254, 259):
+    id = make_id(l)
+    try:
+        print(type(id, (), {}).__name__)
+    except RuntimeError:
+        print('RuntimeError', l)
+
+# hasattr, setattr, getattr
+class A:
+    pass
+for l in range(254, 259):
+    id = make_id(l)
+    a = A()
+    try:
+        setattr(a, id, 123)
+    except RuntimeError:
+        print('RuntimeError', l)
+    try:
+        print(hasattr(a, id), getattr(a, id))
+    except RuntimeError:
+        print('RuntimeError', l)
+
+# format with keys
+for l in range(254, 259):
+    id = make_id(l)
+    try:
+        print(('{' + id + '}').format(**{id: l}))
+    except RuntimeError:
+        print('RuntimeError', l)
+
+# modulo format with keys
+for l in range(254, 259):
+    id = make_id(l)
+    try:
+        print(('%(' + id + ')d') % {id: l})
+    except RuntimeError:
+        print('RuntimeError', l)
+
+# import module
+# (different OS's have different results so only print those that are consistent)
+for l in range(150, 259):
+    try:
+        __import__(make_id(l))
+    except ImportError:
+        if l < 152:
+            print('ok', l)
+    except RuntimeError:
+        if l > 255:
+            print('RuntimeError', l)
+
+# import package
+for l in range(125, 130):
+    try:
+        exec('import ' + make_id(l) + '.' + make_id(l, 'A'))
+    except ImportError:
+        print('ok', l)
+    except RuntimeError:
+        print('RuntimeError', l)

tests/stress/qstr_limit.py.exp

+True
+True
+RuntimeError 256
+RuntimeError 257
+RuntimeError 258
+{'abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrst': 1}
+{'abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstu': 1}
+RuntimeError 256
+RuntimeError 257
+RuntimeError 258
+abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrst
+abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstu
+RuntimeError 256
+RuntimeError 257
+RuntimeError 258
+True 123
+True 123
+RuntimeError 256
+RuntimeError 256
+RuntimeError 257
+RuntimeError 257
+RuntimeError 258
+RuntimeError 258
+254
+255
+RuntimeError 256
+RuntimeError 257
+RuntimeError 258
+254
+255
+RuntimeError 256
+RuntimeError 257
+RuntimeError 258
+ok 150
+ok 151
+RuntimeError 256
+RuntimeError 257
+RuntimeError 258
+ok 125
+ok 126
+ok 127
+RuntimeError 128
+RuntimeError 129