Re: Use zend_string* for op_array->arg_info[].name and class_name

Hi Nikita, Thanks for review. I already thought about both approaches and failed as well (the second also doesn't work with C++). The proposed patch doesn't complicate engine a lot (may be only the inheritance code), but I afraid about problems in some edge cases. Thanks. Dmitry. On Mon, Nov 24, 2014 at 5:27 PM, Nikita Popov <nikita.ppv@gmail.com> wrote: > On Mon, Nov 17, 2014 at 10:25 AM, Dmitry Stogov <dmitry@zend.com> wrote: > >> Hi, >> >> Please review the patch >> https://gist.github.com/dstogov/47a39aff37f0a6441ea0 >> >> Thanks. Dmitry. >> > > Hi Dmitry, sorry for late reply. > > The problem we're trying to solve here is lack of ability to create a > zend_string at compile time. I just tried two ideas how we might be able to > do that, to avoid introducing different arginfos for internal/userland > functions. > > My first approach was to create a zend_string as a string literal using > (zend_string *) ("\1\0\0\0" "\6\1\0\0" "\0\0\0\0" > "\0\0\0\0" str) (for > 32bit LE) and then update the length in zend_register_functions. However > this didn't work because the string literal ends up in readonly > memprotected memory, so this causes a segfault. > > My second approach was to use a C99 compound literal to create a temporary > zend_string-like structure with the correct length: > > #define ZEND_STRING_CT(str) \ > (zend_string *) (struct { \ > uint32_t refcount; uint32_t type_info; \ > zend_ulong h; size_t len; \ > char val[sizeof(str)]; \ > }[1]) {{ 1, IS_STRING | (IS_STR_PERSISTENT << 8), 0, sizeof(str)-1, > str }} > > This seems to work fine (patch > > https://github.com/nikic/php-src/commit/5d49321cd9728e0cc1c2939432e46159f9a78472). > However it requires C99, which we're currently not allowed to use. > > Maybe someone has an idea how this can be done in C89? > > Nikita >