Writing php extensions in golang

Writing php extensions in golang

• 1.
  2015/11/24 PHP BLT do_aki Writing phpextensions in golang
• 2.
  @do_aki ＠do_aki http://do-aki.net/
• 4.
  https://speakerdeck.com/naruse/writing-extension-libraries-in-go
• 5.
  In case ofPHP……?
• 6.
  golang buildmode • -buildmode=c-shared •build the main package (main function is dummy) • export symbol by “//export” https://golang.org/s/execmodes
• 7.
  cgo(call C function) packagemain /* #include <stdlib.h> */ import “C” func Random() int { return int(C.random()) }
• 8.
  cgo(export) package main import “C” //exportgo_func func go_func() int { return 1 }
• 9.
  php extension loadingprocess 1. load shared library (.so / .dll) 2. fetch “get_module” or “_get_module” symbol 3. call fetched function and get pointer to zend_module_entry structure 4. register module using the zend_module_entry ref:php_load_extension in ext/standard/dl.c
• 10.
  export get_module package main /* #include“php.h” */ import “C” var gophp_module_entry C.zend_module_entry //export get_module func get_module() *C.zend_module_entry { gophp_module_entry.name = C.Cstring(“gophp”) gophp_module_entry.functions = … // fill member in gophp_module_entry return gophp_module_entry; }
• 11.
  export get_module package main /* #include“php.h” */ import “C” var gophp_module_entry C.zend_module_entry //export get_module func get_module() *C.zend_module_entry { gophp_module_entry.name = C.Cstring(“gophp”) gophp_module_entry.functions = … // fill member in gophp_module_entry return gophp_module_entry; }
• 12.
  constraints of cin go function -like macro Access union member
• 13.
  separate export functionand function definition • err: multiple definition of ` xxx' • write definition in non_export.go (not include //export) • write declarations in export.go (include //export) • go build non_export.go export.go
• 14.
  github.com/do-aki/gophp_sample
• 15.
  but,but,but • segmentation faultin shutdown process sometimes…… Program received signal SIGSEGV, Segmentation fault. [Switching to Thread 0x7fffee4c2700 (LWP 8943)] 0x00007ffff04d6821 in ?? () (gdb) backtrace #0 0x00007ffff04d6821 in ?? () #1 0x00007ffff04a6213 in ?? () #2 0x000000c82002ce90 in ?? () #3 0x0000000000000000 in ?? () in go runtime? Umm…
• 16.
  fin.