14-shortcircuit.dcf

用Java实现的编译器。把源代码编译成SPARC汇编程序

// test shortcircuit and other stuff

class Program
{
  int field_in_class;

  int test_long_args(int a, int b, int c, int d, int e, int f)
  {
    callout("printf","args: %d+%d+%d+%d+%d+%d=%d\n",a,b,c,d,e,f,a+b+c+d+e+f);
    return a+b+c+d+e+f;
  }

  boolean test_short_circuit(boolean and, boolean okay)
  {
    if (okay != true) {
      if (and != true) {
        callout("printf","short circuit failed in and\n");
      } else {
        callout("printf","short circuit failed in or\n");
      }
    } 
    return true;
  }

  void main()
  {
    int field_on_stack;
    int i, result;
    boolean a;

    callout("printf","hello world from main\n");

    field_in_class = 13;
    field_on_stack = 14;
    callout("printf","some values (13,14): %d %d\n",
	    field_in_class,field_on_stack);

    result = test_long_args(field_in_class,field_in_class,field_in_class,
	                    field_on_stack,field_on_stack,field_on_stack);
    callout("printf","returned a variable, value is %d, should be 81\n",result);

    a = test_short_circuit(false, true);
    callout("printf","returned a constant, value is %d, should be 1\n",a);

    a = true;
    if (a && test_short_circuit(true, true)) {
	callout("printf","successfully did a short-circuited and.\n");
    } else {
	callout("printf","if failed on a && proc\n");
    }

    if (a!=true && test_short_circuit(true, false)) {
	callout("printf","if failed on !a && proc\n");
    } else {
	callout("printf","successfully did a short-circuited and.\n");
    }

    if (a || test_short_circuit(false, false)) {
	callout("printf","successfully did a short-circuited or.\n");
    } else {
	callout("printf","if failed on a || proc\n");
    }

    if (a!=true || test_short_circuit(false, true)) {
	callout("printf","successfully did a short-circuited or.\n");
    } else {
	callout("printf","if failed on !a || proc\n");
    }


    i = 0;
    result = 0;
    field_on_stack = 100;
    while(i < field_on_stack) {
        result = result + i;
	i = i + 1;
    }
    callout("printf","sum from 0 to 99 is %d, should be 4950\n",result);
  }
}