Weird PHP 7.2 bug

> Fixed. thanks. for catching. >

> The real problem - incorrect handling of "wrong index type. > > In this situation PHP should keep input array unchanged. >

> > e.g. $a[$n]++ should change the type of array. >

> > Thanks. Dmitry. > > > ------------------------------ > *From:* Xinchen Hui <laruence@php.net> > *Sent:* Monday, October 30, 2017 10:05:30 AM > *To:* Derick Rethans > *Cc:* Dmitry Stogov; Nikita Popov; PHP Developers Mailing List > *Subject:* Re: [PHP-DEV] Weird PHP 7.2 bug > > Hey: > > On Mon, Oct 30, 2017 at 2:48 AM, Derick Rethans <derick@php.net> wrote: > >> Hi, >> >> running: >> https://raw.githubusercontent.com/xdebug/xdebug/master/tests/bug01263.inc >> >> with: >> $ php -n -dzend_extension=opcache.so -dopcache.enable_cli=1 >> tests/bug01263.inc >> >> Produces the following output with PHP 7.2 build at Oct 29 2017 18:49:58: >> >> In function PHP_CodeCoverage::addUncoveredFilesFromWhitelist (after >> sccp): >> var 10 (CV $data) has array value type but not key type >> var 15 (CV $data) has array value type but not key type >> var 21 (CV $data) has array value type but not key type >> >> In function PHP_CodeCoverage::addUncoveredFilesFromWhitelist (after >> calls): >> var 10 (CV $data) has array value type but not key type >> var 15 (CV $data) has array value type but not key type >> var 21 (CV $data) has array value type but not key type >> >> In function PHP_CodeCoverage::addUncoveredFilesFromWhitelist (after dce): >> var 10 (CV $data) has array value type but not key type >> var 15 (CV $data) has array value type but not key type >> var 21 (CV $data) has array value type but not key type >> >> In function PHP_CodeCoverage::addUncoveredFilesFromWhitelist (after dfa): >> var 10 (CV $data) has array value type but not key type >> var 15 (CV $data) has array value type but not key type >> var 21 (CV $data) has array value type but not key type >> > First, this won't bring any harm to execution, this is becuase we know $uncoveredFiles > are IS_UNDEF for sure(thus the foreach block actually won't be executed), > > > then in typeinfo inference system, we will get $uncoveredFile with type > info 0. > > then later while doing type inference for ZEND_FETCH_W ($data[$uncoveredFile][$i] > = ), since $unconveredFile has 0 type info, thus we won't get any key info > of the array ($data), > > but in the current type inference system, FETCH_W's result will be used in > ASSIGN_DIM , then the system think $data maybe an array of > array(MAY_BE_ARRAY_OF_ARRAY). > > which result: has array value type but not key type > > anyway, I think infer type infos by usage is wrong here, we should only > trust def info, not use info... > > so, I propose fix this by: https://gist.github.com/laruence/ > 9990ce5f9f3b30dd98dbff4f59109232 > > Dmitry, what do you think? > > thanks > >> >> >> cheers, >> Derick >> >> -- >> https://derickrethans.nl | https://xdebug.org | https://dram.io >> Like Xdebug? Consider a donation: https://xdebug.org/donate.php >> twitter: @derickr and @xdebug >> >> -- >> PHP Internals - PHP Runtime Development Mailing List >> To unsubscribe, visit: http://www.php.net/unsub.php >> > > > > -- > Xinchen Hui > @Laruence > http://www.laruence.com/ >