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main.c

/* Copyright (c) 1993-2005 by Richard Kelsey and Jonathan Rees.
   See file COPYING. */

#include <stdlib.h>
#include <stdio.h>
#include "scheme48vm.h"
#include "scheme48heap.h"
#include "scheme48image.h"

extern long s48_get_file_size(unsigned char *);

#if !defined(DEFAULT_HEAP_SIZE)
/* 3 megacell = 12 megabytes (6 meg per semispace) */
#define DEFAULT_HEAP_SIZE 3000000L
#endif

#if !defined(DEFAULT_STACK_SIZE)
/* 2500 cells = 10000 bytes */
#define DEFAULT_STACK_SIZE 2500L
#endif

#if defined(STATIC_AREAS)
#define DEFAULT_IMAGE_NAME NULL
#else

/* DEFAULT_IMAGE_NAME should be defined using the -D switch to cc. */
#if !defined(DEFAULT_IMAGE_NAME)
#define DEFAULT_IMAGE_NAME "scheme48.image"
#endif

#endif /* STATIC_AREAS */

extern void s48_sysdep_init(void);
extern void s48_initialize_external_modules(void);

char *s48_object_file;   /* specified via a command line argument */

int
main(int argc, char *argv[])
{
  char *image_name = DEFAULT_IMAGE_NAME;
  long heap_size = DEFAULT_HEAP_SIZE;    /* in numbers of cells */
  long stack_size = DEFAULT_STACK_SIZE;  /* in numbers of cells */
  int errors = 0;
  long return_value;
  char *stack;

#if defined(STATIC_AREAS)
  extern long static_entry;
  extern long static_symbol_table;
  extern long static_imported_binding_table, static_exported_binding_table;
  extern long p_count, *p_areas[], p_sizes[];
  extern long i_count, *i_areas[], i_sizes[];
#endif

  long vm_argc = 0;
  char *me = *argv;           /* Save program name. */

  {
    /* initialize floating-point printer */
    extern void s48_free_init(void);
    
    s48_free_init();
  }

  s48_object_file = NULL;

  argv++; argc--;       /* Skip program name. */

  for (; argc > 0; argc--, argv++)
    if (argv[0][0] == '-')
      switch (argv[0][1]) {
      case 'h':
      argc--; argv++;
      if (argc == 0) { errors++; break; }
      heap_size = atoi(*argv);
      if (heap_size <= 0) errors++;
      break;
      case 's':
      argc--; argv++;
      if (argc == 0) { errors++; break; }
      stack_size = atoi(*argv);
      if (stack_size <= 0) errors++;
      break;
      case 'i':
      argc--; argv++;
      if (argc == 0) { errors++; break; }
      image_name = *argv;
      break;
      case 'a':
      argc--;
      vm_argc = argc;    /* remaining args are passed to the VM */
      argc = 0;
      break;
      case 'o':
        argc--; argv++;
      if (argc == 0) { errors++; break; }
        s48_object_file = *argv;
      break;
      default:
      fprintf(stderr, "Invalid argument: %s\n", *argv);
      errors++;
      }
    else
      if (argv[0][0] != '\0') {
      fprintf(stderr, "Invalid argument: %s\n", *argv);
      errors++; }
  if (errors != 0) {
    fprintf(stderr,
"Usage: %s [options] [-a arguments]\n\
Options: -h <total heap size in words>\n\
       -s <stack buffer size in words>\n\
         -i <image file name>\n\
         -o <object file name>\n",
          me);
    return 1;
  }

  s48_sysdep_init();
  s48_heap_init();
  s48_init();

  if (image_name == NULL) {
#if defined(STATIC_AREAS)
    s48_register_static_areas(p_count, p_areas, p_sizes,
                        i_count, i_areas, i_sizes);
    s48_set_image_valuesB(static_entry,
                    static_symbol_table,
                    static_imported_binding_table,
                    static_exported_binding_table);
    if (-1 == s48_initialize_heap(heap_size, 0, 0)) {
      fprintf(stderr, "system is out of memory\n");
      return 1; }
#else
    fprintf(stderr, "No image file.\n");
    return 1;
#endif
  } else if (s48_read_image(image_name, heap_size) == -1) {
    fprintf(stderr, "Image file \"%s\" is unusable.\n", image_name);
    return 1; }
  
  stack = (char *) malloc(stack_size * sizeof(long));
    
  if (!stack) {
    fprintf(stderr, "system is out of memory\n");
    return 1; }

  s48_initialize_vm(stack, stack_size);

  s48_initialize_external_modules();
  
  return_value = s48_call_startup_procedure(argv, vm_argc);

  return(return_value);
}

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