On Mon, Nov 17, 2014 at 10:25 AM, Dmitry Stogov <dmi...@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
