Mirror
/
cpython
mirror of https://github.com/python/cpython
4
1
Fork 0
Code Issues Releases Wiki Activity

merge heads

This commit is contained in:
Gregory P. Smith 2012-07-21 21:23:00 -07:00
parent b9e9e0d5a8 68f555c03a
commit ea2ce47958
15 changed files with 173 additions and 85 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
Doc/library/functions.rst
View File

@ -1558,7 +1558,7 @@ available. They are listed here in alphabetical order.
.. note::
This is an advanced function that is not needed in everyday Python
programming.
programming, unlike :func:`importlib.import_module`.
This function is invoked by the :keyword:`import` statement. It can be
replaced (by importing the :mod:`__builtin__` module and assigning to
@ -1609,15 +1609,8 @@ available. They are listed here in alphabetical order.
names.
If you simply want to import a module (potentially within a package) by name,
you can call :func:`__import__` and then look it up in :data:`sys.modules`::
use :func:`importlib.import_module`.
>>> import sys
>>> name = 'foo.bar.baz'
>>> __import__(name)
<module 'foo' from ...>
>>> baz = sys.modules[name]
>>> baz
<module 'foo.bar.baz' from ...>
.. versionchanged:: 2.5
The level parameter was added.

3
Doc/library/logging.rst
View File

@ -629,6 +629,9 @@ format string.
.. versionchanged:: 2.5
*funcName* was added.
.. versionchanged:: 2.6
*processName* was added.
.. _logger-adapter:
LoggerAdapter Objects

2
Doc/library/subprocess.rst
View File

@ -289,7 +289,7 @@ functions.
Popen(['/bin/sh', '-c', args[0], args[1], ...])
On Windows: the :class:`Popen` class uses CreateProcess() to execute the child
On Windows: the :class:`Popen` class uses CreateProcess() to execute the
child program, which operates on strings. If *args* is a sequence, it will
be converted to a string in a manner described in
:ref:`converting-argument-sequence`.

17
Lib/argparse.py
View File

@ -740,10 +740,10 @@ class Action(_AttributeHolder):
- default -- The value to be produced if the option is not specified.
- type -- The type which the command-line arguments should be converted
to, should be one of 'string', 'int', 'float', 'complex' or a
callable object that accepts a single string argument. If None,
'string' is assumed.
- type -- A callable that accepts a single string argument, and
returns the converted value. The standard Python types str, int,
float, and complex are useful examples of such callables. If None,
str is used.
- choices -- A container of values that should be allowed. If not None,
after a command-line argument has been converted to the appropriate
@ -1967,7 +1967,7 @@ class ArgumentParser(_AttributeHolder, _ActionsContainer):
for arg_string in arg_strings:
# for regular arguments, just add them back into the list
if arg_string[0] not in self.fromfile_prefix_chars:
if not arg_string or arg_string[0] not in self.fromfile_prefix_chars:
new_arg_strings.append(arg_string)
# replace arguments referencing files with the file content
@ -2174,9 +2174,12 @@ class ArgumentParser(_AttributeHolder, _ActionsContainer):
# Value conversion methods
# ========================
def _get_values(self, action, arg_strings):
# for everything but PARSER args, strip out '--'
# for everything but PARSER, REMAINDER args, strip out first '--'
if action.nargs not in [PARSER, REMAINDER]:
arg_strings = [s for s in arg_strings if s != '--']
try:
arg_strings.remove('--')
except ValueError:
pass
# optional argument produces a default when not present
if not arg_strings and action.nargs == OPTIONAL:

20
Lib/ctypes/test/test_bitfields.py
View File

@ -240,5 +240,25 @@ class BitFieldTest(unittest.TestCase):
_anonymous_ = ["_"]
_fields_ = [("_", X)]
@unittest.skipUnless(hasattr(ctypes, "c_uint32"), "c_int32 is required")
def test_uint32(self):
class X(Structure):
_fields_ = [("a", c_uint32, 32)]
x = X()
x.a = 10
self.assertEquals(x.a, 10)
x.a = 0xFDCBA987
self.assertEquals(x.a, 0xFDCBA987)
@unittest.skipUnless(hasattr(ctypes, "c_uint64"), "c_int64 is required")
def test_uint64(self):
class X(Structure):
_fields_ = [("a", c_uint64, 64)]
x = X()
x.a = 10
self.assertEquals(x.a, 10)
x.a = 0xFEDCBA9876543211
self.assertEquals(x.a, 0xFEDCBA9876543211)
if __name__ == "__main__":
unittest.main()

3
Lib/posixpath.py
View File

@ -68,7 +68,8 @@ def isabs(s):
def join(a, *p):
"""Join two or more pathname components, inserting '/' as needed.
If any component is an absolute path, all previous path components
will be discarded."""
will be discarded. An empty last part will result in a path that
ends with a separator."""
path = a
for b in p:
if b.startswith('/'):

38
Lib/test/test_argparse.py
View File

@ -1374,6 +1374,7 @@ class TestArgumentsFromFile(TempDirMixin, ParserTestCase):
('X @hello', NS(a=None, x='X', y=['hello world!'])),
('-a B @recursive Y Z', NS(a='A', x='hello world!', y=['Y', 'Z'])),
('X @recursive Z -a B', NS(a='B', x='X', y=['hello world!', 'Z'])),
(["-a", "", "X", "Y"], NS(a='', x='X', y=['Y'])),
]
@ -1763,6 +1764,14 @@ class TestAddSubparsers(TestCase):
parser2.add_argument('-y', choices='123', help='y help')
parser2.add_argument('z', type=complex, nargs='*', help='z help')
# add third sub-parser
parser3_kwargs = dict(description='3 description')
if subparser_help:
parser3_kwargs['help'] = '3 help'
parser3 = subparsers.add_parser('3', **parser3_kwargs)
parser3.add_argument('t', type=int, help='t help')
parser3.add_argument('u', nargs='...', help='u help')
# return the main parser
return parser
@ -1792,6 +1801,10 @@ class TestAddSubparsers(TestCase):
self.parser.parse_args('--foo 0.125 1 c'.split()),
NS(foo=True, bar=0.125, w=None, x='c'),
)
self.assertEqual(
self.parser.parse_args('-1.5 3 11 -- a --foo 7 -- b'.split()),
NS(foo=False, bar=-1.5, t=11, u=['a', '--foo', '7', '--', 'b']),
)
def test_parse_known_args(self):
self.assertEqual(
@ -1826,15 +1839,15 @@ class TestAddSubparsers(TestCase):
def test_help(self):
self.assertEqual(self.parser.format_usage(),
'usage: PROG [-h] [--foo] bar {1,2} ...\n')
'usage: PROG [-h] [--foo] bar {1,2,3} ...\n')
self.assertEqual(self.parser.format_help(), textwrap.dedent('''\
usage: PROG [-h] [--foo] bar {1,2} ...
usage: PROG [-h] [--foo] bar {1,2,3} ...
main description
positional arguments:
bar bar help
{1,2} command help
{1,2,3} command help
optional arguments:
-h, --help show this help message and exit
@ -1845,15 +1858,15 @@ class TestAddSubparsers(TestCase):
# Make sure - is still used for help if it is a non-first prefix char
parser = self._get_parser(prefix_chars='+:-')
self.assertEqual(parser.format_usage(),
'usage: PROG [-h] [++foo] bar {1,2} ...\n')
'usage: PROG [-h] [++foo] bar {1,2,3} ...\n')
self.assertEqual(parser.format_help(), textwrap.dedent('''\
usage: PROG [-h] [++foo] bar {1,2} ...
usage: PROG [-h] [++foo] bar {1,2,3} ...
main description
positional arguments:
bar bar help
{1,2} command help
{1,2,3} command help
optional arguments:
-h, --help show this help message and exit
@ -1864,15 +1877,15 @@ class TestAddSubparsers(TestCase):
def test_help_alternate_prefix_chars(self):
parser = self._get_parser(prefix_chars='+:/')
self.assertEqual(parser.format_usage(),
'usage: PROG [+h] [++foo] bar {1,2} ...\n')
'usage: PROG [+h] [++foo] bar {1,2,3} ...\n')
self.assertEqual(parser.format_help(), textwrap.dedent('''\
usage: PROG [+h] [++foo] bar {1,2} ...
usage: PROG [+h] [++foo] bar {1,2,3} ...
main description
positional arguments:
bar bar help
{1,2} command help
{1,2,3} command help
optional arguments:
+h, ++help show this help message and exit
@ -1881,18 +1894,19 @@ class TestAddSubparsers(TestCase):
def test_parser_command_help(self):
self.assertEqual(self.command_help_parser.format_usage(),
'usage: PROG [-h] [--foo] bar {1,2} ...\n')
'usage: PROG [-h] [--foo] bar {1,2,3} ...\n')
self.assertEqual(self.command_help_parser.format_help(),
textwrap.dedent('''\
usage: PROG [-h] [--foo] bar {1,2} ...
usage: PROG [-h] [--foo] bar {1,2,3} ...
main description
positional arguments:
bar bar help
{1,2} command help
{1,2,3} command help
1 1 help
2 2 help
3 3 help
optional arguments:
-h, --help show this help message and exit

28
Lib/test/test_codecs.py
View File

@ -495,7 +495,19 @@ class UTF16LETest(ReadTest):
)
def test_errors(self):
self.assertRaises(UnicodeDecodeError, codecs.utf_16_le_decode, "\xff", "strict", True)
tests = [
(b'\xff', u'\ufffd'),
(b'A\x00Z', u'A\ufffd'),
(b'A\x00B\x00C\x00D\x00Z', u'ABCD\ufffd'),
(b'\x00\xd8', u'\ufffd'),
(b'\x00\xd8A', u'\ufffd'),
(b'\x00\xd8A\x00', u'\ufffdA'),
(b'\x00\xdcA\x00', u'\ufffdA'),
]
for raw, expected in tests:
self.assertRaises(UnicodeDecodeError, codecs.utf_16_le_decode,
raw, 'strict', True)
self.assertEqual(raw.decode('utf-16le', 'replace'), expected)
class UTF16BETest(ReadTest):
encoding = "utf-16-be"
@ -516,7 +528,19 @@ class UTF16BETest(ReadTest):
)
def test_errors(self):
self.assertRaises(UnicodeDecodeError, codecs.utf_16_be_decode, "\xff", "strict", True)
tests = [
(b'\xff', u'\ufffd'),
(b'\x00A\xff', u'A\ufffd'),
(b'\x00A\x00B\x00C\x00DZ', u'ABCD\ufffd'),
(b'\xd8\x00', u'\ufffd'),
(b'\xd8\x00\xdc', u'\ufffd'),
(b'\xd8\x00\x00A', u'\ufffdA'),
(b'\xdc\x00\x00A', u'\ufffdA'),
]
for raw, expected in tests:
self.assertRaises(UnicodeDecodeError, codecs.utf_16_be_decode,
raw, 'strict', True)
self.assertEqual(raw.decode('utf-16be', 'replace'), expected)
class UTF8Test(ReadTest):
encoding = "utf-8"

1
Misc/ACKS
View File

@ -462,6 +462,7 @@ Thomas Kluyver
Kim Knapp
Lenny Kneler
Pat Knight
Jeff Knupp
Greg Kochanski
Damon Kohler
Marko Kohtala

14
Misc/NEWS
View File

@ -9,6 +9,12 @@ What's New in Python 2.7.4
Core and Builtins
-----------------
- Issue #14579: Fix error handling bug in the utf-16 decoder. Patch by
Serhiy Storchaka.
- Issue #15368: An issue that caused bytecode generation to be
non-deterministic when using randomized hashing (-R) has been fixed.
- Issue #15033: Fix the exit status bug when modules invoked using -m swith,
return the proper failure return value (1). Patch contributed by Jeff Knupp.
@ -84,6 +90,14 @@ Core and Builtins
Library
-------
- Issue #13922: argparse no longer incorrectly strips '--'s that appear
after the first one.
- Issue #12353: argparse now correctly handles null argument values.
- Issue #6493: An issue in ctypes on Windows that caused structure bitfields
of type ctypes.c_uint32 and width 32 to incorrectly be set has been fixed.
- Issue #14635: telnetlib will use poll() rather than select() when possible
to avoid failing due to the select() file descriptor limit.

51
Modules/_ctypes/cfield.c
View File

@ -431,12 +431,8 @@ get_ulonglong(PyObject *v, unsigned PY_LONG_LONG *p)
#define LOW_BIT(x) ((x) & 0xFFFF)
#define NUM_BITS(x) ((x) >> 16)
/* This seems nore a compiler issue than a Windows/non-Windows one */
#ifdef MS_WIN32
# define BIT_MASK(size) ((1 << NUM_BITS(size))-1)
#else
# define BIT_MASK(size) ((1LL << NUM_BITS(size))-1)
#endif
/* Doesn't work if NUM_BITS(size) == 0, but it never happens in SET() call. */
#define BIT_MASK(type, size) (((((type)1 << (NUM_BITS(size) - 1)) - 1) << 1) + 1)
/* This macro CHANGES the first parameter IN PLACE. For proper sign handling,
we must first shift left, then right.
@ -448,10 +444,10 @@ get_ulonglong(PyObject *v, unsigned PY_LONG_LONG *p)
}
/* This macro RETURNS the first parameter with the bit field CHANGED. */
#define SET(x, v, size) \
#define SET(type, x, v, size) \
(NUM_BITS(size) ? \
( ( x & ~(BIT_MASK(size) << LOW_BIT(size)) ) | ( (v & BIT_MASK(size)) << LOW_BIT(size) ) ) \
: v)
( ( (type)x & ~(BIT_MASK(type, size) << LOW_BIT(size)) ) | ( ((type)v & BIT_MASK(type, size)) << LOW_BIT(size) ) ) \
: (type)v)
/* byte swapping macros */
#define SWAP_2(v) \
@ -523,7 +519,7 @@ b_set(void *ptr, PyObject *value, Py_ssize_t size)
long val;
if (get_long(value, &val) < 0)
return NULL;
*(signed char *)ptr = (signed char)SET(*(signed char *)ptr, (signed char)val, size);
*(signed char *)ptr = SET(signed char, *(signed char *)ptr, val, size);
_RET(value);
}
@ -542,8 +538,7 @@ B_set(void *ptr, PyObject *value, Py_ssize_t size)
unsigned long val;
if (get_ulong(value, &val) < 0)
return NULL;
*(unsigned char *)ptr = (unsigned char)SET(*(unsigned char*)ptr,
(unsigned short)val, size);
*(unsigned char *)ptr = SET(unsigned char, *(unsigned char*)ptr, val, size);
_RET(value);
}
@ -564,7 +559,7 @@ h_set(void *ptr, PyObject *value, Py_ssize_t size)
if (get_long(value, &val) < 0)
return NULL;
memcpy(&x, ptr, sizeof(x));
x = SET(x, (short)val, size);
x = SET(short, x, val, size);
memcpy(ptr, &x, sizeof(x));
_RET(value);
}
@ -579,7 +574,7 @@ h_set_sw(void *ptr, PyObject *value, Py_ssize_t size)
return NULL;
memcpy(&field, ptr, sizeof(field));
field = SWAP_2(field);
field = SET(field, (short)val, size);
field = SET(short, field, val, size);
field = SWAP_2(field);
memcpy(ptr, &field, sizeof(field));
_RET(value);
@ -612,7 +607,7 @@ H_set(void *ptr, PyObject *value, Py_ssize_t size)
if (get_ulong(value, &val) < 0)
return NULL;
memcpy(&x, ptr, sizeof(x));
x = SET(x, (unsigned short)val, size);
x = SET(unsigned short, x, val, size);
memcpy(ptr, &x, sizeof(x));
_RET(value);
}
@ -626,7 +621,7 @@ H_set_sw(void *ptr, PyObject *value, Py_ssize_t size)
return NULL;
memcpy(&field, ptr, sizeof(field));
field = SWAP_2(field);
field = SET(field, (unsigned short)val, size);
field = SET(unsigned short, field, val, size);
field = SWAP_2(field);
memcpy(ptr, &field, sizeof(field));
_RET(value);
@ -660,7 +655,7 @@ i_set(void *ptr, PyObject *value, Py_ssize_t size)
if (get_long(value, &val) < 0)
return NULL;
memcpy(&x, ptr, sizeof(x));
x = SET(x, (int)val, size);
x = SET(int, x, val, size);
memcpy(ptr, &x, sizeof(x));
_RET(value);
}
@ -674,7 +669,7 @@ i_set_sw(void *ptr, PyObject *value, Py_ssize_t size)
return NULL;
memcpy(&field, ptr, sizeof(field));
field = SWAP_INT(field);
field = SET(field, (int)val, size);
field = SET(int, field, val, size);
field = SWAP_INT(field);
memcpy(ptr, &field, sizeof(field));
_RET(value);
@ -761,7 +756,7 @@ I_set(void *ptr, PyObject *value, Py_ssize_t size)
if (get_ulong(value, &val) < 0)
return NULL;
memcpy(&x, ptr, sizeof(x));
x = SET(x, (unsigned int)val, size);
x = SET(unsigned int, x, val, size);
memcpy(ptr, &x, sizeof(x));
_RET(value);
}
@ -774,7 +769,7 @@ I_set_sw(void *ptr, PyObject *value, Py_ssize_t size)
if (get_ulong(value, &val) < 0)
return NULL;
memcpy(&field, ptr, sizeof(field));
field = (unsigned int)SET(field, (unsigned int)val, size);
field = SET(unsigned int, field, (unsigned int)val, size);
field = SWAP_INT(field);
memcpy(ptr, &field, sizeof(field));
_RET(value);
@ -808,7 +803,7 @@ l_set(void *ptr, PyObject *value, Py_ssize_t size)
if (get_long(value, &val) < 0)
return NULL;
memcpy(&x, ptr, sizeof(x));
x = SET(x, val, size);
x = SET(long, x, val, size);
memcpy(ptr, &x, sizeof(x));
_RET(value);
}
@ -822,7 +817,7 @@ l_set_sw(void *ptr, PyObject *value, Py_ssize_t size)
return NULL;
memcpy(&field, ptr, sizeof(field));
field = SWAP_LONG(field);
field = (long)SET(field, val, size);
field = SET(long, field, val, size);
field = SWAP_LONG(field);
memcpy(ptr, &field, sizeof(field));
_RET(value);
@ -856,7 +851,7 @@ L_set(void *ptr, PyObject *value, Py_ssize_t size)
if (get_ulong(value, &val) < 0)
return NULL;
memcpy(&x, ptr, sizeof(x));
x = SET(x, val, size);
x = SET(unsigned long, x, val, size);
memcpy(ptr, &x, sizeof(x));
_RET(value);
}
@ -870,7 +865,7 @@ L_set_sw(void *ptr, PyObject *value, Py_ssize_t size)
return NULL;
memcpy(&field, ptr, sizeof(field));
field = SWAP_LONG(field);
field = (unsigned long)SET(field, val, size);
field = SET(unsigned long, field, val, size);
field = SWAP_LONG(field);
memcpy(ptr, &field, sizeof(field));
_RET(value);
@ -905,7 +900,7 @@ q_set(void *ptr, PyObject *value, Py_ssize_t size)
if (get_longlong(value, &val) < 0)
return NULL;
memcpy(&x, ptr, sizeof(x));
x = SET(x, val, size);
x = SET(PY_LONG_LONG, x, val, size);
memcpy(ptr, &x, sizeof(x));
_RET(value);
}
@ -919,7 +914,7 @@ q_set_sw(void *ptr, PyObject *value, Py_ssize_t size)
return NULL;
memcpy(&field, ptr, sizeof(field));
field = SWAP_8(field);
field = (PY_LONG_LONG)SET(field, val, size);
field = SET(PY_LONG_LONG, field, val, size);
field = SWAP_8(field);
memcpy(ptr, &field, sizeof(field));
_RET(value);
@ -952,7 +947,7 @@ Q_set(void *ptr, PyObject *value, Py_ssize_t size)
if (get_ulonglong(value, &val) < 0)
return NULL;
memcpy(&x, ptr, sizeof(x));
x = SET(x, val, size);
x = SET(PY_LONG_LONG, x, val, size);
memcpy(ptr, &x, sizeof(x));
_RET(value);
}
@ -966,7 +961,7 @@ Q_set_sw(void *ptr, PyObject *value, Py_ssize_t size)
return NULL;
memcpy(&field, ptr, sizeof(field));
field = SWAP_8(field);
field = (unsigned PY_LONG_LONG)SET(field, val, size);
field = SET(unsigned PY_LONG_LONG, field, val, size);
field = SWAP_8(field);
memcpy(ptr, &field, sizeof(field));
_RET(value);

2
Objects/unicodeobject.c
View File

@ -2564,7 +2564,7 @@ PyUnicode_DecodeUTF16Stateful(const char *s,
}
/* UTF-16 code pair: */
if (q >= e) {
if (e - q < 2) {
errmsg = "unexpected end of data";
startinpos = (((const char *)q)-2)-starts;
endinpos = ((const char *)e)-starts;

8
Python/bltinmodule.c
View File

@ -53,8 +53,12 @@ builtin___import__(PyObject *self, PyObject *args, PyObject *kwds)
PyDoc_STRVAR(import_doc,
"__import__(name, globals={}, locals={}, fromlist=[], level=-1) -> module\n\
\n\
Import a module. The globals are only used to determine the context;\n\
they are not modified. The locals are currently unused. The fromlist\n\
Import a module. Because this function is meant for use by the Python\n\
interpreter and not for general use it is better to use\n\
importlib.import_module() to programmatically import a module.\n\
\n\
The globals argument is only used to determine the context;\n\
they are not modified. The locals argument is unused. The fromlist\n\
should be a list of names to emulate ``from name import ...'', or an\n\
empty list to emulate ``import name''.\n\
When importing a module from a package, note that __import__('A.B', ...)\n\

24
Python/compile.c
View File

@ -359,14 +359,31 @@ each key.
static PyObject *
dictbytype(PyObject *src, int scope_type, int flag, int offset)
{
Py_ssize_t pos = 0, i = offset, scope;
Py_ssize_t i = offset, scope, num_keys, key_i;
PyObject *k, *v, *dest = PyDict_New();
PyObject *sorted_keys;
assert(offset >= 0);
if (dest == NULL)
return NULL;
while (PyDict_Next(src, &pos, &k, &v)) {
/* Sort the keys so that we have a deterministic order on the indexes
saved in the returned dictionary. These indexes are used as indexes
into the free and cell var storage. Therefore if they aren't
deterministic, then the generated bytecode is not deterministic.
*/
sorted_keys = PyDict_Keys(src);
if (sorted_keys == NULL)
return NULL;
if (PyList_Sort(sorted_keys) != 0) {
Py_DECREF(sorted_keys);
return NULL;
}
num_keys = PyList_GET_SIZE(sorted_keys);
for (key_i = 0; key_i < num_keys; key_i++) {
k = PyList_GET_ITEM(sorted_keys, key_i);
v = PyDict_GetItem(src, k);
/* XXX this should probably be a macro in symtable.h */
assert(PyInt_Check(v));
scope = (PyInt_AS_LONG(v) >> SCOPE_OFF) & SCOPE_MASK;
@ -374,12 +391,14 @@ dictbytype(PyObject *src, int scope_type, int flag, int offset)
if (scope == scope_type || PyInt_AS_LONG(v) & flag) {
PyObject *tuple, *item = PyInt_FromLong(i);
if (item == NULL) {
Py_DECREF(sorted_keys);
Py_DECREF(dest);
return NULL;
}
i++;
tuple = PyTuple_Pack(2, k, k->ob_type);
if (!tuple || PyDict_SetItem(dest, tuple, item) < 0) {
Py_DECREF(sorted_keys);
Py_DECREF(item);
Py_DECREF(dest);
Py_XDECREF(tuple);
@ -389,6 +408,7 @@ dictbytype(PyObject *src, int scope_type, int flag, int offset)
Py_DECREF(tuple);
}
}
Py_DECREF(sorted_keys);
return dest;
}

14
Python/peephole.c
View File

@ -532,8 +532,7 @@ PyCode_Optimize(PyObject *code, PyObject* consts, PyObject *names,
tgt = GETJUMPTGT(codestr, i);
j = codestr[tgt];
if (CONDITIONAL_JUMP(j)) {
/* NOTE: all possible jumps here are
absolute! */
/* NOTE: all possible jumps here are absolute! */
if (JUMPS_ON_TRUE(j) == JUMPS_ON_TRUE(opcode)) {
/* The second jump will be
taken iff the first is. */
@ -544,13 +543,10 @@ PyCode_Optimize(PyObject *code, PyObject* consts, PyObject *names,
SETARG(codestr, i, tgttgt);
goto reoptimize_current;
} else {
/* The second jump is not taken
if the first is (so jump past
it), and all conditional
jumps pop their argument when
they're not taken (so change
the first jump to pop its
argument when it's taken). */
/* The second jump is not taken if the first is (so
jump past it), and all conditional jumps pop their
argument when they're not taken (so change the
first jump to pop its argument when it's taken). */
if (JUMPS_ON_TRUE(opcode))
codestr[i] = POP_JUMP_IF_TRUE;
else