156 lines
3.5 KiB
Plaintext
156 lines
3.5 KiB
Plaintext
|
// SPDX-License-Identifier: GPL-2.0-only
|
||
|
|
/// do_div() does a 64-by-32 division.
|
||
|
|
/// When the divisor is long, unsigned long, u64, or s64,
|
||
|
|
/// do_div() truncates it to 32 bits, this means it can test
|
||
|
|
/// non-zero and be truncated to 0 for division on 64bit platforms.
|
||
|
|
///
|
||
|
|
//# This makes an effort to find those inappropriate do_div() calls.
|
||
|
|
//
|
||
|
|
// Confidence: Moderate
|
||
|
|
// Copyright: (C) 2020 Wen Yang, Alibaba.
|
||
|
|
// Comments:
|
||
|
|
// Options: --no-includes --include-headers
|
||
|
|
|
||
|
|
virtual context
|
||
|
|
virtual org
|
||
|
|
virtual report
|
||
|
|
|
||
|
|
@initialize:python@
|
||
|
|
@@
|
||
|
|
|
||
|
|
def get_digit_type_and_value(str):
|
||
|
|
is_digit = False
|
||
|
|
value = 0
|
||
|
|
|
||
|
|
try:
|
||
|
|
if (str.isdigit()):
|
||
|
|
is_digit = True
|
||
|
|
value = int(str, 0)
|
||
|
|
elif (str.upper().endswith('ULL')):
|
||
|
|
is_digit = True
|
||
|
|
value = int(str[:-3], 0)
|
||
|
|
elif (str.upper().endswith('LL')):
|
||
|
|
is_digit = True
|
||
|
|
value = int(str[:-2], 0)
|
||
|
|
elif (str.upper().endswith('UL')):
|
||
|
|
is_digit = True
|
||
|
|
value = int(str[:-2], 0)
|
||
|
|
elif (str.upper().endswith('L')):
|
||
|
|
is_digit = True
|
||
|
|
value = int(str[:-1], 0)
|
||
|
|
elif (str.upper().endswith('U')):
|
||
|
|
is_digit = True
|
||
|
|
value = int(str[:-1], 0)
|
||
|
|
except Exception as e:
|
||
|
|
print('Error:',e)
|
||
|
|
is_digit = False
|
||
|
|
value = 0
|
||
|
|
finally:
|
||
|
|
return is_digit, value
|
||
|
|
|
||
|
|
def filter_out_safe_constants(str):
|
||
|
|
is_digit, value = get_digit_type_and_value(str)
|
||
|
|
if (is_digit):
|
||
|
|
if (value >= 0x100000000):
|
||
|
|
return True
|
||
|
|
else:
|
||
|
|
return False
|
||
|
|
else:
|
||
|
|
return True
|
||
|
|
|
||
|
|
def construct_warnings(suggested_fun):
|
||
|
|
msg="WARNING: do_div() does a 64-by-32 division, please consider using %s instead."
|
||
|
|
return msg % suggested_fun
|
||
|
|
|
||
|
|
@depends on context@
|
||
|
|
expression f;
|
||
|
|
long l: script:python() { filter_out_safe_constants(l) };
|
||
|
|
unsigned long ul : script:python() { filter_out_safe_constants(ul) };
|
||
|
|
u64 ul64 : script:python() { filter_out_safe_constants(ul64) };
|
||
|
|
s64 sl64 : script:python() { filter_out_safe_constants(sl64) };
|
||
|
|
|
||
|
|
@@
|
||
|
|
(
|
||
|
|
* do_div(f, l);
|
||
|
|
|
|
||
|
|
* do_div(f, ul);
|
||
|
|
|
|
||
|
|
* do_div(f, ul64);
|
||
|
|
|
|
||
|
|
* do_div(f, sl64);
|
||
|
|
)
|
||
|
|
|
||
|
|
@r depends on (org || report)@
|
||
|
|
expression f;
|
||
|
|
position p;
|
||
|
|
long l: script:python() { filter_out_safe_constants(l) };
|
||
|
|
unsigned long ul : script:python() { filter_out_safe_constants(ul) };
|
||
|
|
u64 ul64 : script:python() { filter_out_safe_constants(ul64) };
|
||
|
|
s64 sl64 : script:python() { filter_out_safe_constants(sl64) };
|
||
|
|
@@
|
||
|
|
(
|
||
|
|
do_div@p(f, l);
|
||
|
|
|
|
||
|
|
do_div@p(f, ul);
|
||
|
|
|
|
||
|
|
do_div@p(f, ul64);
|
||
|
|
|
|
||
|
|
do_div@p(f, sl64);
|
||
|
|
)
|
||
|
|
|
||
|
|
@script:python depends on org@
|
||
|
|
p << r.p;
|
||
|
|
ul << r.ul;
|
||
|
|
@@
|
||
|
|
|
||
|
|
coccilib.org.print_todo(p[0], construct_warnings("div64_ul"))
|
||
|
|
|
||
|
|
@script:python depends on org@
|
||
|
|
p << r.p;
|
||
|
|
l << r.l;
|
||
|
|
@@
|
||
|
|
|
||
|
|
coccilib.org.print_todo(p[0], construct_warnings("div64_long"))
|
||
|
|
|
||
|
|
@script:python depends on org@
|
||
|
|
p << r.p;
|
||
|
|
ul64 << r.ul64;
|
||
|
|
@@
|
||
|
|
|
||
|
|
coccilib.org.print_todo(p[0], construct_warnings("div64_u64"))
|
||
|
|
|
||
|
|
@script:python depends on org@
|
||
|
|
p << r.p;
|
||
|
|
sl64 << r.sl64;
|
||
|
|
@@
|
||
|
|
|
||
|
|
coccilib.org.print_todo(p[0], construct_warnings("div64_s64"))
|
||
|
|
|
||
|
|
@script:python depends on report@
|
||
|
|
p << r.p;
|
||
|
|
ul << r.ul;
|
||
|
|
@@
|
||
|
|
|
||
|
|
coccilib.report.print_report(p[0], construct_warnings("div64_ul"))
|
||
|
|
|
||
|
|
@script:python depends on report@
|
||
|
|
p << r.p;
|
||
|
|
l << r.l;
|
||
|
|
@@
|
||
|
|
|
||
|
|
coccilib.report.print_report(p[0], construct_warnings("div64_long"))
|
||
|
|
|
||
|
|
@script:python depends on report@
|
||
|
|
p << r.p;
|
||
|
|
sl64 << r.sl64;
|
||
|
|
@@
|
||
|
|
|
||
|
|
coccilib.report.print_report(p[0], construct_warnings("div64_s64"))
|
||
|
|
|
||
|
|
@script:python depends on report@
|
||
|
|
p << r.p;
|
||
|
|
ul64 << r.ul64;
|
||
|
|
@@
|
||
|
|
|
||
|
|
coccilib.report.print_report(p[0], construct_warnings("div64_u64"))
|