libgo/runtime/go-main.c

   1 /* go-main.c -- the main function for a Go program.
   2
   3    Copyright 2009 The Go Authors. All rights reserved.
   4    Use of this source code is governed by a BSD-style
   5    license that can be found in the LICENSE file.  */
   6
   7 #include "config.h"
   8
   9 #include <stdlib.h>
  10 #include <time.h>
  11
  12 #ifdef HAVE_FPU_CONTROL_H
  13 #include <fpu_control.h>
  14 #endif
  15
  16 #include "go-alloc.h"
  17 #include "array.h"
  18 #include "go-signal.h"
  19 #include "go-string.h"
  20
  21 #include "runtime.h"
  22 #include "malloc.h"
  23
  24 #undef int
  25 #undef char
  26 #undef unsigned
  27
  28 /* The main function for a Go program.  This records the command line
  29    parameters, calls the real main function, and returns a zero status
  30    if the real main function returns.  */
  31
  32 extern char **environ;
  33
  34 extern struct __go_open_array Args asm ("libgo_os.os.Args");
  35
  36 extern struct __go_open_array Envs asm ("libgo_os.os.Envs");
  37
  38 /* These functions are created for the main package.  */
  39 extern void __go_init_main (void);
  40 extern void real_main (void) asm ("main.main");
  41
  42 /* The main function.  */
  43
  44 int
  45 main (int argc, char **argv)
  46 {
  47   int i;
  48   struct __go_string *values;
  49
  50   runtime_mallocinit ();
  51   __go_gc_goroutine_init (&argc);
  52
  53   Args.__count = argc;
  54   Args.__capacity = argc;
  55   values = __go_alloc (argc * sizeof (struct __go_string));
  56   for (i = 0; i < argc; ++i)
  57     {
  58       values[i].__data = (unsigned char *) argv[i];
  59       values[i].__length = __builtin_strlen (argv[i]);
  60     }
  61   Args.__values = values;
  62
  63   for (i = 0; environ[i] != NULL; ++i)
  64     ;
  65   Envs.__count = i;
  66   Envs.__capacity = i;
  67   values = __go_alloc (i * sizeof (struct __go_string));
  68   for (i = 0; environ[i] != NULL; ++i)
  69     {
  70       values[i].__data = (unsigned char *) environ[i];
  71       values[i].__length = __builtin_strlen (environ[i]);
  72     }
  73   Envs.__values = values;
  74
  75   __initsig ();
  76
  77 #if defined(HAVE_SRANDOM)
  78   srandom ((unsigned int) time (NULL));
  79 #else
  80   srand ((unsigned int) time (NULL));
  81 #endif
  82   __go_init_main ();
  83
  84   __go_enable_gc ();
  85
  86   real_main ();
  87
  88   return 0;
  89 }