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SF #660455 : patch by NNorwitz.

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"Unsigned" (i.e., positive-looking, but really negative) hex/oct
constants with a leading minus sign are once again properly negated.
The micro-optimization for negated numeric constants did the wrong
thing for such hex/oct constants.  The patch avoids the optimization
for all hex/oct constants.

This needs to be backported to Python 2.2!
This commit is contained in:
Guido van Rossum 2003-02-12 16:57:47 +00:00
parent e71b9f830b
commit 66b1259dbc
3 changed files with 14 additions and 8 deletions
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15
Lib/test/test_compile.py
View file

@ -133,9 +133,12 @@ expect_same("000000000000007", 7)
expect_same("000000000000008.", 8.) expect_same("000000000000008.", 8.)
expect_same("000000000000009.", 9.) expect_same("000000000000009.", 9.)
## # Verify treatment of unary minus on negative numbers SF bug #660455 # Verify treatment of unary minus on negative numbers SF bug #660455
## import warnings import warnings
## warnings.filterwarnings("ignore", "hex/oct constants", FutureWarning) warnings.filterwarnings("ignore", "hex/oct constants", FutureWarning)
## # XXX Of course the following test will have to be changed in Python 2.4 # XXX Of course the following test will have to be changed in Python 2.4
## expect_same("0xffffffff", -1) # This test is in a <string> so the filterwarnings() can affect it
## expect_same("-0xffffffff", 1) exec """
expect_same("0xffffffff", -1)
expect_same("-0xffffffff", 1)
"""

4
Lib/test/test_grammar.py
View file

@ -37,7 +37,9 @@ try:
except ImportError: except ImportError:
maxint = 2147483647 maxint = 2147483647
if maxint == 2147483647: if maxint == 2147483647:
if -2147483647-1 != -020000000000: raise TestFailed, 'max negative int' # The following test will start to fail in Python 2.4;
# change the 020000000000 to -020000000000
if -2147483647-1 != 020000000000: raise TestFailed, 'max negative int'
# XXX -2147483648 # XXX -2147483648
if 037777777777 != -1: raise TestFailed, 'oct -1' if 037777777777 != -1: raise TestFailed, 'oct -1'
if 0xffffffff != -1: raise TestFailed, 'hex -1' if 0xffffffff != -1: raise TestFailed, 'hex -1'

3
Python/compile.c
View file

@ -2069,7 +2069,8 @@ com_factor(struct compiling *c, node *n)
&& NCH(ppower) == 1 && NCH(ppower) == 1
&& TYPE((patom = CHILD(ppower, 0))) == atom && TYPE((patom = CHILD(ppower, 0))) == atom
&& TYPE((pnum = CHILD(patom, 0))) == NUMBER && TYPE((pnum = CHILD(patom, 0))) == NUMBER
&& !(childtype == MINUS && is_float_zero(STR(pnum)))) { && !(childtype == MINUS &&
(STR(pnum)[0] == '0' || is_float_zero(STR(pnum))))) {
if (childtype == TILDE) { if (childtype == TILDE) {
com_invert_constant(c, pnum); com_invert_constant(c, pnum);
return; return;