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 "arch.h"
  23 #include "malloc.h"
  24
  25 #undef int
  26 #undef char
  27 #undef unsigned
  28
  29 /* The main function for a Go program.  This records the command line
  30    parameters, calls the real main function, and returns a zero status
  31    if the real main function returns.  */
  32
  33 extern char **environ;
  34
  35 extern struct __go_open_array Args asm ("libgo_os.os.Args");
  36
  37 extern struct __go_open_array Envs asm ("libgo_os.os.Envs");
  38
  39 /* These functions are created for the main package.  */
  40 extern void __go_init_main (void);
  41 extern void real_main (void) asm ("main.main");
  42
  43 /* The main function.  */
  44
  45 int
  46 main (int argc, char **argv)
  47 {
  48   int i;
  49   struct __go_string *values;
  50
  51   runtime_mallocinit ();
  52   runtime_cpuprofinit ();
  53   __go_gc_goroutine_init (&argc);
  54
  55   Args.__count = argc;
  56   Args.__capacity = argc;
  57   values = __go_alloc (argc * sizeof (struct __go_string));
  58   for (i = 0; i < argc; ++i)
  59     {
  60       values[i].__data = (unsigned char *) argv[i];
  61       values[i].__length = __builtin_strlen (argv[i]);
  62     }
  63   Args.__values = values;
  64
  65   for (i = 0; environ[i] != NULL; ++i)
  66     ;
  67   Envs.__count = i;
  68   Envs.__capacity = i;
  69   values = __go_alloc (i * sizeof (struct __go_string));
  70   for (i = 0; environ[i] != NULL; ++i)
  71     {
  72       values[i].__data = (unsigned char *) environ[i];
  73       values[i].__length = __builtin_strlen (environ[i]);
  74     }
  75   Envs.__values = values;
  76
  77   __initsig ();
  78
  79 #if defined(HAVE_SRANDOM)
  80   srandom ((unsigned int) time (NULL));
  81 #else
  82   srand ((unsigned int) time (NULL));
  83 #endif
  84   __go_init_main ();
  85
  86   __go_enable_gc ();
  87
  88   real_main ();
  89
  90   return 0;
  91 }