libc-bottom-half/crt/crt1.c

   1 #include <wasi/api.h>
   2 extern void __wasm_call_ctors(void);
   3 extern int __main_void(void);
   4 extern void __wasm_call_dtors(void);
   5
   6 __attribute__((export_name("_start")))
   7 void _start(void) {
   8     // The linker synthesizes this to call constructors.
   9     __wasm_call_ctors();
  10
  11     // Call `__main_void` which will either be the application's zero-argument
  12     // `__main_void` function or a libc routine which obtains the command-line
  13     // arguments and calls `__main_argv_argc`.
  14     int r = __main_void();
  15
  16     // Call atexit functions, destructors, stdio cleanup, etc.
  17     __wasm_call_dtors();
  18
  19     // If main exited successfully, just return, otherwise call
  20     // `__wasi_proc_exit`.
  21     if (r != 0) {
  22         __wasi_proc_exit(r);
  23     }
  24 }