basics/crt/crt1.c

   1 extern void __wasm_call_ctors(void);
   2 extern int __original_main(void);
   3 extern void __prepare_for_exit(void);
   4 void _Exit(int) __attribute__((noreturn));
   5
   6 void _start(void) {
   7     // The linker synthesizes this to call constructors.
   8     __wasm_call_ctors();
   9
  10     // Call `__original_main` which will either be the application's
  11     // zero-argument `main` function (renamed by the compiler) or a libc
  12     // routine which populates `argv` and `argc` and calls the application's
  13     // two-argument `main`.
  14     int r = __original_main();
  15
  16     // Call atexit functions, destructors, stdio cleanup, etc.
  17     __prepare_for_exit();
  18
  19     // If main exited successfully, just return, otherwise call _Exit.
  20     if (r != 0) {
  21         _Exit(r);
  22     }
  23 }