WIKI: phpng-upgrading

8 years ago by Yasuo Ohgaki — view source

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Hi ZendEngine developers,

I'm not sure if the wiki page is maintained, but I noticed few errors.

https://wiki.php.net/phpng-upgrading#strings
has following example.

ZVAL_STRING(zv, str, 1);

ZVAL_STRING(zv, str);

ZVAL_STRINGL(zv, str, len, 1);

ZVAL_STRINGL(zv, str, len);

ZVAL_STRING(zv, str, 0);

ZVAL_STRING(zv, str);
efree(str);

ZVAL_STRINGL(zv, str, len, 0);

ZVAL_STRINGL(zv, str, len);
efree(str);

Since PHP5 has following definition for ZVAL_STRING*()

#define ZVAL_STRING(z, s, duplicate) do {
const char *__s=(s);
zval __z = (z);
Z_STRLEN_P(__z) = strlen(__s);
Z_STRVAL_P(__z) = (duplicate?estrndup(__s,
Z_STRLEN_P(__z)):(char)__s);
Z_TYPE_P(__z) = IS_STRING;
} while (0)

the example's 0 and 1 are flipped, efree() locations are wrong.

In https://wiki.php.net/phpng-upgrading#zend_string_api ,
it says

zend_string_init(char *val, int len, int persistent)

Current definition is

zend_string_init(char *val, size_t len, int persistent)

Should I update the doc or is the doc is maintained
elsewhere?

Regards

--
Yasuo Ohgaki
yohgaki@ohgaki.net

8 years ago by Sean DuBois — view source

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Hi ZendEngine developers,

I'm not sure if the wiki page is maintained, but I noticed few errors.

https://wiki.php.net/phpng-upgrading#strings
has following example.

ZVAL_STRING(zv, str, 1);

ZVAL_STRING(zv, str);

ZVAL_STRINGL(zv, str, len, 1);

ZVAL_STRINGL(zv, str, len);

ZVAL_STRING(zv, str, 0);

ZVAL_STRING(zv, str);

efree(str);

ZVAL_STRINGL(zv, str, len, 0);

ZVAL_STRINGL(zv, str, len);

efree(str);

Since PHP5 has following definition for ZVAL_STRING*()

#define ZVAL_STRING(z, s, duplicate) do {
const char *__s=(s);
zval __z = (z);
Z_STRLEN_P(__z) = strlen(__s);
Z_STRVAL_P(__z) = (duplicate?estrndup(__s,
Z_STRLEN_P(__z)):(char)__s);
Z_TYPE_P(__z) = IS_STRING;
} while (0)

the example's 0 and 1 are flipped, efree() locations are wrong.

In https://wiki.php.net/phpng-upgrading#zend_string_api ,
it says

zend_string_init(char *val, int len, int persistent)

Current definition is

zend_string_init(char *val, size_t len, int persistent)

Should I update the doc or is the doc is maintained
elsewhere?

Regards

--
Yasuo Ohgaki
yohgaki@ohgaki.net

--

Hi!

I tried to get access to that page as well, but didn't have any luck
would you mind adding the zend_parse_paramaters changes?

'l' went from 'long' -> 'zend_long' and 's' went from 'int' -> 'size_t'.

So many extensions have been ported without this in mind, and it bites
in really nasty hard to reproduce runtime ways.

thanks!

8 years ago by Yasuo Ohgaki — view source

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Hi Sean,

I tried to get access to that page as well, but didn't have any luck
would you mind adding the zend_parse_paramaters changes?

'l' went from 'long' -> 'zend_long' and 's' went from 'int' -> 'size_t'.

So many extensions have been ported without this in mind, and it bites
in really nasty hard to reproduce runtime ways.

Good point.
zend_parse_parameters() is using "size_t" for string length, since
zend_string uses size_t for it.

struct _zend_string {
zend_refcounted_h gc;
zend_ulong h; /* hash value */
size_t len;
char val[1];
};

AFAIK, PHP7 repo's function parameters are changed to size_t.
This should be described in upgrading doc for 3rd party module
developers.

Regards,

--
Yasuo Ohgaki
yohgaki@ohgaki.net

8 years ago by Nikita Popov — view source

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Hi!

I tried to get access to that page as well, but didn't have any luck
would you mind adding the zend_parse_paramaters changes?

'l' went from 'long' -> 'zend_long' and 's' went from 'int' -> 'size_t'.

So many extensions have been ported without this in mind, and it bites
in really nasty hard to reproduce runtime ways.

I've added these two to the zpp section, thanks!

Nikita

8 years ago by Nikita Popov — view source

unread

Hi ZendEngine developers,

I'm not sure if the wiki page is maintained, but I noticed few errors.

https://wiki.php.net/phpng-upgrading#strings
has following example.

ZVAL_STRING(zv, str, 1);

ZVAL_STRING(zv, str);

ZVAL_STRINGL(zv, str, len, 1);

ZVAL_STRINGL(zv, str, len);

ZVAL_STRING(zv, str, 0);

ZVAL_STRING(zv, str);

efree(str);

ZVAL_STRINGL(zv, str, len, 0);

ZVAL_STRINGL(zv, str, len);

efree(str);

Since PHP5 has following definition for ZVAL_STRING*()

#define ZVAL_STRING(z, s, duplicate) do {
const char *__s=(s);
zval __z = (z);
Z_STRLEN_P(__z) = strlen(__s);
Z_STRVAL_P(__z) = (duplicate?estrndup(__s,
Z_STRLEN_P(__z)):(char)__s);
Z_TYPE_P(__z) = IS_STRING;
} while (0)

the example's 0 and 1 are flipped, efree() locations are wrong.

These examples are correct. In PHP 7 ZVAL_STRING always duplicates, which
is what the 1 parameter used to signify.

In https://wiki.php.net/phpng-upgrading#zend_string_api ,
it says

zend_string_init(char *val, int len, int persistent)

Current definition is

zend_string_init(char *val, size_t len, int persistent)

Should I update the doc or is the doc is maintained
elsewhere?

I've fixed this. But yes, you should update the doc, it's not maintained
elsewhere.

Thanks,
Nikita

8 years ago by Yasuo Ohgaki — view source

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Hi Nikita,

These examples are correct. In PHP 7 ZVAL_STRING always duplicates, which is
what the 1 parameter used to signify.

Oh, now I see the example intention.
Thank you.

--
Yasuo Ohgaki
yohgaki@ohgaki.net

8 years ago by Andrea Faulds — view source

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Hi Yasuo,

Yasuo Ohgaki wrote:

Hi ZendEngine developers,

I'm not sure if the wiki page is maintained, but I noticed few errors.

https://wiki.php.net/phpng-upgrading#strings

phpng-upgrading was written back when it was just phpng and the 64-bit
patch wasn't merged. Heck, I don't think phpng was merged into master at
that point either.

Given it's now needed for PHP 7 migration, maybe we should move it into
UPGRADING.INTERNALS or onto the PHP manual?

Thanks.

Andrea Faulds
https://ajf.me/