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Code Issues Projects Releases Packages Wiki Activity Actions 11

Issue #9011: AST creation no longer modifies CST for negated numeric literals.

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This commit is contained in:
Mark Dickinson 2012-11-25 17:11:33 +00:00
parent 1658797a9d
commit b1cc6aa2df
3 changed files with 29 additions and 10 deletions
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11
Lib/test/test_parser.py
View file

@ -567,6 +567,17 @@ class CompileTestCase(unittest.TestCase):
st = parser.suite('a = u"\u1"')
self.assertRaises(SyntaxError, parser.compilest, st)
def test_issue_9011(self):
# Issue 9011: compilation of an unary minus expression changed
# the meaning of the ST, so that a second compilation produced
# incorrect results.
st = parser.expr('-3')
code1 = parser.compilest(st)
self.assertEqual(eval(code1), -3)
code2 = parser.compilest(st)
self.assertEqual(eval(code2), -3)
class ParserStackLimitTestCase(unittest.TestCase):
"""try to push the parser to/over it's limits.
see http://bugs.python.org/issue1881 for a discussion

3
Misc/NEWS
View file

@ -9,6 +9,9 @@ What's New in Python 2.7.4
Core and Builtins
-----------------
- Issue #9011: Fix hacky AST code that modified the CST when compiling
a negated numeric literal.
- Issue #16306: Fix multiple error messages when unknown command line
parameters where passed to the interpreter. Patch by Hieu Nguyen.

25
Python/ast.c
View file

@ -930,7 +930,7 @@ ast_for_decorated(struct compiling *c, const node *n)
return NULL;
assert(TYPE(CHILD(n, 1)) == funcdef ||
TYPE(CHILD(n, 1)) == classdef);
TYPE(CHILD(n, 1)) == classdef);
if (TYPE(CHILD(n, 1)) == funcdef) {
thing = ast_for_funcdef(c, CHILD(n, 1), decorator_seq);
@ -1744,14 +1744,19 @@ ast_for_factor(struct compiling *c, const node *n)
NCH(ppower) == 1 &&
TYPE((patom = CHILD(ppower, 0))) == atom &&
TYPE((pnum = CHILD(patom, 0))) == NUMBER) {
PyObject *pynum;
char *s = PyObject_MALLOC(strlen(STR(pnum)) + 2);
if (s == NULL)
return NULL;
s[0] = '-';
strcpy(s + 1, STR(pnum));
PyObject_FREE(STR(pnum));
STR(pnum) = s;
return ast_for_atom(c, patom);
pynum = parsenumber(c, s);
PyObject_FREE(s);
if (!pynum)
return NULL;
PyArena_AddPyObject(c->c_arena, pynum);
return Num(pynum, LINENO(n), n->n_col_offset, c->c_arena);
}
expression = ast_for_expr(c, CHILD(n, 1));
@ -3292,8 +3297,8 @@ ast_for_stmt(struct compiling *c, const node *n)
return ast_for_funcdef(c, ch, NULL);
case classdef:
return ast_for_classdef(c, ch, NULL);
case decorated:
return ast_for_decorated(c, ch);
case decorated:
return ast_for_decorated(c, ch);
default:
PyErr_Format(PyExc_SystemError,
"unhandled small_stmt: TYPE=%d NCH=%d\n",
@ -3382,8 +3387,8 @@ decode_unicode(struct compiling *c, const char *s, size_t len, int rawmode, cons
/* check for integer overflow */
if (len > PY_SIZE_MAX / 6)
return NULL;
/* "<C3><A4>" (2 bytes) may become "\U000000E4" (10 bytes), or 1:5
"\ä" (3 bytes) may become "\u005c\U000000E4" (16 bytes), or ~1:6 */
/* "<C3><A4>" (2 bytes) may become "\U000000E4" (10 bytes), or 1:5
"\ä" (3 bytes) may become "\u005c\U000000E4" (16 bytes), or ~1:6 */
u = PyString_FromStringAndSize((char *)NULL, len * 6);
if (u == NULL)
return NULL;
@ -3413,8 +3418,8 @@ decode_unicode(struct compiling *c, const char *s, size_t len, int rawmode, cons
sprintf(p, "\\U%02x%02x%02x%02x",
r[i + 0] & 0xFF,
r[i + 1] & 0xFF,
r[i + 2] & 0xFF,
r[i + 3] & 0xFF);
r[i + 2] & 0xFF,
r[i + 3] & 0xFF);
p += 10;
}
Py_DECREF(w);