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Merge #13041: build: Add linter checking for accidental introduction of locale dependence

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698cfd0811 docs: Mention lint-locale-dependence.sh in developer-notes.md (practicalswift)
0a4ea2f458 build: Add linter for checking accidental locale dependence (practicalswift)

Pull request description:

  This linter will check for code accidentally introducing locale dependencies.

  Unnecessary locale dependence can cause bugs that are very tricky to isolate and fix. We should avoid using locale dependent functions if possible.

  Context: https://github.com/bitcoin/bitcoin/pull/12881#issuecomment-378564722

  Example output:

  ```
  $ contrib/devtools/lint-locale-dependence.sh
  The locale dependent function tolower(...) appears to be used:
  src/init.cpp:    if (s[0] == '0' && std::tolower(s[1]) == 'x') {

  Unnecessary locale dependence can cause bugs that are very
  tricky to isolate and fix. Please avoid using locale dependent
  functions if possible.

  Advice not applicable in this specific case? Add an exception
  by updating the ignore list in contrib/devtools/lint-locale-dependence.sh
  ```

  **Note to reviewers:** What is the most appropriate `LOCALE_DEPENDENT_FUNCTIONS` function list? What should be added or removed?

Tree-SHA512: 14e448828804bb02bf59070647e38b52fce120c700c903a4a8472769a2cee5dd529bd3fc182386993cb8720482cf4250b63a0a477db61b941ae4babe5c65025f
This commit is contained in:
Wladimir J. van der Laan 2018-06-07 08:55:26 +02:00
commit 5779dc4f76
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GPG key ID: 1E4AED62986CD25D
2 changed files with 258 additions and 1 deletions
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30
doc/developer-notes.md
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@ -499,7 +499,35 @@ Strings and formatting
- Use `ParseInt32`, `ParseInt64`, `ParseUInt32`, `ParseUInt64`, `ParseDouble` from `utilstrencodings.h` for number parsing
- *Rationale*: These functions do overflow checking, and avoid pesky locale issues
- *Rationale*: These functions do overflow checking, and avoid pesky locale issues.
- Avoid using locale dependent functions if possible. You can use the provided
[`lint-locale-dependence.sh`](/contrib/devtools/lint-locale-dependence.sh)
to check for accidental use of locale dependent functions.
- *Rationale*: Unnecessary locale dependence can cause bugs that are very tricky to isolate and fix.
- These functions are known to be locale dependent:
`alphasort`, `asctime`, `asprintf`, `atof`, `atoi`, `atol`, `atoll`, `atoq`,
`btowc`, `ctime`, `dprintf`, `fgetwc`, `fgetws`, `fprintf`, `fputwc`,
`fputws`, `fscanf`, `fwprintf`, `getdate`, `getwc`, `getwchar`, `isalnum`,
`isalpha`, `isblank`, `iscntrl`, `isdigit`, `isgraph`, `islower`, `isprint`,
`ispunct`, `isspace`, `isupper`, `iswalnum`, `iswalpha`, `iswblank`,
`iswcntrl`, `iswctype`, `iswdigit`, `iswgraph`, `iswlower`, `iswprint`,
`iswpunct`, `iswspace`, `iswupper`, `iswxdigit`, `isxdigit`, `mblen`,
`mbrlen`, `mbrtowc`, `mbsinit`, `mbsnrtowcs`, `mbsrtowcs`, `mbstowcs`,
`mbtowc`, `mktime`, `putwc`, `putwchar`, `scanf`, `snprintf`, `sprintf`,
`sscanf`, `stoi`, `stol`, `stoll`, `strcasecmp`, `strcasestr`, `strcoll`,
`strfmon`, `strftime`, `strncasecmp`, `strptime`, `strtod`, `strtof`,
`strtoimax`, `strtol`, `strtold`, `strtoll`, `strtoq`, `strtoul`,
`strtoull`, `strtoumax`, `strtouq`, `strxfrm`, `swprintf`, `tolower`,
`toupper`, `towctrans`, `towlower`, `towupper`, `ungetwc`, `vasprintf`,
`vdprintf`, `versionsort`, `vfprintf`, `vfscanf`, `vfwprintf`, `vprintf`,
`vscanf`, `vsnprintf`, `vsprintf`, `vsscanf`, `vswprintf`, `vwprintf`,
`wcrtomb`, `wcscasecmp`, `wcscoll`, `wcsftime`, `wcsncasecmp`, `wcsnrtombs`,
`wcsrtombs`, `wcstod`, `wcstof`, `wcstoimax`, `wcstol`, `wcstold`,
`wcstoll`, `wcstombs`, `wcstoul`, `wcstoull`, `wcstoumax`, `wcswidth`,
`wcsxfrm`, `wctob`, `wctomb`, `wctrans`, `wctype`, `wcwidth`, `wprintf`
- For `strprintf`, `LogPrint`, `LogPrintf` formatting characters don't need size specifiers

229
test/lint/lint-locale-dependence.sh Executable file
View file

@ -0,0 +1,229 @@
#!/bin/bash
KNOWN_VIOLATIONS=(
"src/base58.cpp:.*isspace"
"src/bitcoin-tx.cpp.*stoul"
"src/bitcoin-tx.cpp.*trim_right"
"src/bitcoin-tx.cpp:.*atoi"
"src/core_read.cpp.*is_digit"
"src/dbwrapper.cpp.*stoul"
"src/dbwrapper.cpp:.*vsnprintf"
"src/httprpc.cpp.*trim"
"src/init.cpp:.*atoi"
"src/netbase.cpp.*to_lower"
"src/qt/rpcconsole.cpp:.*atoi"
"src/qt/rpcconsole.cpp:.*isdigit"
"src/rest.cpp:.*strtol"
"src/rpc/server.cpp.*to_upper"
"src/test/dbwrapper_tests.cpp:.*snprintf"
"src/test/getarg_tests.cpp.*split"
"src/torcontrol.cpp:.*atoi"
"src/torcontrol.cpp:.*strtol"
"src/uint256.cpp:.*isspace"
"src/uint256.cpp:.*tolower"
"src/util.cpp:.*atoi"
"src/util.cpp:.*fprintf"
"src/util.cpp:.*tolower"
"src/utilmoneystr.cpp:.*isdigit"
"src/utilmoneystr.cpp:.*isspace"
"src/utilstrencodings.cpp:.*atoi"
"src/utilstrencodings.cpp:.*isspace"
"src/utilstrencodings.cpp:.*strtol"
"src/utilstrencodings.cpp:.*strtoll"
"src/utilstrencodings.cpp:.*strtoul"
"src/utilstrencodings.cpp:.*strtoull"
"src/utilstrencodings.h:.*atoi"
)
REGEXP_IGNORE_EXTERNAL_DEPENDENCIES="^src/(crypto/ctaes/|leveldb/|secp256k1/|tinyformat.h|univalue/)"
LOCALE_DEPENDENT_FUNCTIONS=(
alphasort # LC_COLLATE (via strcoll)
asctime # LC_TIME (directly)
asprintf # (via vasprintf)
atof # LC_NUMERIC (via strtod)
atoi # LC_NUMERIC (via strtol)
atol # LC_NUMERIC (via strtol)
atoll # (via strtoll)
atoq
btowc # LC_CTYPE (directly)
ctime # (via asctime or localtime)
dprintf # (via vdprintf)
fgetwc
fgetws
fold_case # boost::locale::fold_case
fprintf # (via vfprintf)
fputwc
fputws
fscanf # (via __vfscanf)
fwprintf # (via __vfwprintf)
getdate # via __getdate_r => isspace // __localtime_r
getwc
getwchar
is_digit # boost::algorithm::is_digit
is_space # boost::algorithm::is_space
isalnum # LC_CTYPE
isalpha # LC_CTYPE
isblank # LC_CTYPE
iscntrl # LC_CTYPE
isctype # LC_CTYPE
isdigit # LC_CTYPE
isgraph # LC_CTYPE
islower # LC_CTYPE
isprint # LC_CTYPE
ispunct # LC_CTYPE
isspace # LC_CTYPE
isupper # LC_CTYPE
iswalnum # LC_CTYPE
iswalpha # LC_CTYPE
iswblank # LC_CTYPE
iswcntrl # LC_CTYPE
iswctype # LC_CTYPE
iswdigit # LC_CTYPE
iswgraph # LC_CTYPE
iswlower # LC_CTYPE
iswprint # LC_CTYPE
iswpunct # LC_CTYPE
iswspace # LC_CTYPE
iswupper # LC_CTYPE
iswxdigit # LC_CTYPE
isxdigit # LC_CTYPE
localeconv # LC_NUMERIC + LC_MONETARY
mblen # LC_CTYPE
mbrlen
mbrtowc
mbsinit
mbsnrtowcs
mbsrtowcs
mbstowcs # LC_CTYPE
mbtowc # LC_CTYPE
mktime
normalize # boost::locale::normalize
# printf # LC_NUMERIC
putwc
putwchar
scanf # LC_NUMERIC
setlocale
snprintf
sprintf
sscanf
stod
stof
stoi
stol
stold
stoll
stoul
stoull
strcasecmp
strcasestr
strcoll # LC_COLLATE
# strerror
strfmon
strftime # LC_TIME
strncasecmp
strptime
strtod # LC_NUMERIC
strtof
strtoimax
strtol # LC_NUMERIC
strtold
strtoll
strtoq
strtoul # LC_NUMERIC
strtoull
strtoumax
strtouq
strxfrm # LC_COLLATE
swprintf
to_lower # boost::locale::to_lower
to_title # boost::locale::to_title
to_upper # boost::locale::to_upper
tolower # LC_CTYPE
toupper # LC_CTYPE
towctrans
towlower # LC_CTYPE
towupper # LC_CTYPE
trim # boost::algorithm::trim
trim_left # boost::algorithm::trim_left
trim_right # boost::algorithm::trim_right
ungetwc
vasprintf
vdprintf
versionsort
vfprintf
vfscanf
vfwprintf
vprintf
vscanf
vsnprintf
vsprintf
vsscanf
vswprintf
vwprintf
wcrtomb
wcscasecmp
wcscoll # LC_COLLATE
wcsftime # LC_TIME
wcsncasecmp
wcsnrtombs
wcsrtombs
wcstod # LC_NUMERIC
wcstof
wcstoimax
wcstol # LC_NUMERIC
wcstold
wcstoll
wcstombs # LC_CTYPE
wcstoul # LC_NUMERIC
wcstoull
wcstoumax
wcswidth
wcsxfrm # LC_COLLATE
wctob
wctomb # LC_CTYPE
wctrans
wctype
wcwidth
wprintf
)
function join_array {
local IFS="$1"
shift
echo "$*"
}
REGEXP_IGNORE_KNOWN_VIOLATIONS=$(join_array "|" "${KNOWN_VIOLATIONS[@]}")
# Invoke "git grep" only once in order to minimize run-time
REGEXP_LOCALE_DEPENDENT_FUNCTIONS=$(join_array "|" "${LOCALE_DEPENDENT_FUNCTIONS[@]}")
GIT_GREP_OUTPUT=$(git grep -E "[^a-zA-Z0-9_\`'\"<>](${REGEXP_LOCALE_DEPENDENT_FUNCTIONS}(|_r|_s))[^a-zA-Z0-9_\`'\"<>]" -- "*.cpp" "*.h")
EXIT_CODE=0
for LOCALE_DEPENDENT_FUNCTION in "${LOCALE_DEPENDENT_FUNCTIONS[@]}"; do
MATCHES=$(grep -E "[^a-zA-Z0-9_\`'\"<>]${LOCALE_DEPENDENT_FUNCTION}(|_r|_s)[^a-zA-Z0-9_\`'\"<>]" <<< "${GIT_GREP_OUTPUT}" | \
grep -vE "\.(c|cpp|h):\s*(//|\*|/\*|\").*${LOCALE_DEPENDENT_FUNCTION}" | \
grep -vE 'fprintf\(.*(stdout|stderr)')
if [[ ${REGEXP_IGNORE_EXTERNAL_DEPENDENCIES} != "" ]]; then
MATCHES=$(grep -vE "${REGEXP_IGNORE_EXTERNAL_DEPENDENCIES}" <<< "${MATCHES}")
fi
if [[ ${REGEXP_IGNORE_KNOWN_VIOLATIONS} != "" ]]; then
MATCHES=$(grep -vE "${REGEXP_IGNORE_KNOWN_VIOLATIONS}" <<< "${MATCHES}")
fi
if [[ ${MATCHES} != "" ]]; then
echo "The locale dependent function ${LOCALE_DEPENDENT_FUNCTION}(...) appears to be used:"
echo "${MATCHES}"
echo
EXIT_CODE=1
fi
done
if [[ ${EXIT_CODE} != 0 ]]; then
echo "Unnecessary locale dependence can cause bugs that are very"
echo "tricky to isolate and fix. Please avoid using locale dependent"
echo "functions if possible."
echo
echo "Advice not applicable in this specific case? Add an exception"
echo "by updating the ignore list in $0"
fi
exit ${EXIT_CODE}