static void generate_return(code_block *parent, return_statement *ret) {
function *fn = ret->target;
bool non_void = !is_void(fn->return_type);
if (non_void == !ret->value) {
fprintf(stderr, "return from void function with return or non-void without "
"return\n");
abort();
}
size_t param_count = 1 + non_void;
if (non_void) {
parent = generate_expression(parent, ret->value);
}
parent->tail.type = GOTO;
parent->tail.parameter_count = param_count;
parent->tail.parameters = xmalloc(sizeof(size_t) * param_count);
if (non_void) {
parent->tail.parameters[1] = last_instruction(parent);
}
parent->tail.parameters[0] = 0;
parent->tail.first_block = next_instruction(parent);
size_t return_index = instruction_type(parent, 0)->struct_index;
code_struct *return_struct = get_code_struct(parent->system, return_index);
type *return_block_type = return_struct->fields[0].field_type;
code_instruction *unwrap = new_instruction(parent, 2);
unwrap->operation.type = O_GET_FIELD;
unwrap->type = copy_type(return_block_type);
unwrap->parameters[0] = 0; // return structs are always the first argument
unwrap->parameters[1] = 0; // blockref position in all return structs
}
void run_cpu(cpu* i) {
i->status = 1;
i->running = 1;
//printf("\n\t---------------------------------------------------------------------\n");
while(i->running) {
// Get the next instruction:
i->opcode = get_opcode(i);
// Increment the pointer to the next instruction:
next_instruction(i, 1);
// OpCodes:
switch(i->opcode) {
//
// @opcode: SET
// @args: 2
// b: Register Address
// a: Set Value
// @description:
// This opcode takes 2 parameters, b and a. It'll set [a] (value of a) to b (the memory address of
// the pointer)
//
// @todo: Add support for stack memory addresses.
//
case SET:
// Create a new scope so we can create variables, etc...
{
// Use b as the index of the register array.
// Because the registers' addreses range from [0x00-0x07], we can
// treat them as integers, converting them to [0-7].
set_register(i, get_arg(i, 0), get_arg(i, 1));
debug_opcode(i, "SET", 2);
next_instruction(i, 2); // 2 arguments.
break;
}
case ADD:
{
set_register_ex(i, get_register_value(i, get_arg(i, 0), 3) + get_arg(i, 1));
if (get_register_ex_value(i) > 0xffff)
{
// Overflow:
set_register_ex(i, 0x001);
i->overflow = 1;
set_register(i, get_arg(i, 0), 0x00);
}
else
{
set_register(i, get_arg(i, 0), get_register_ex_value(i));
set_register_ex(i, 0x000);
}
debug_opcode(i, "ADD", 2);
next_instruction(i, 2); // 2 arguments.
break;
}
case SUB:
{
set_register_ex(i, get_register_value(i, get_arg(i, 0), 3) - get_arg(i, 1));
if ( get_arg(i, 1) > get_register_value(i, get_arg(i, 0), 3))
{
// Overflow:
set_register_ex(i, 0xffff);
i->underflow = 1;
set_register(i, get_arg(i, 0), 0x00);
}
else
{
set_register(i, get_arg(i, 0), get_register_ex_value(i));
set_register_ex(i, 0x000);
}
debug_opcode(i, "SUB", 2);
next_instruction(i, 2); // 2 arguments.
break;
}
// Store in the stack:
case MUL:
set_register_ex(i, get_register_value(i, get_arg(i, 0), 3) * get_arg(i, 1));
set_register(i, get_arg(i, 0), get_register_ex_value(i));
set_register_ex(i, get_register_ex_value(i) >> 16);
debug_opcode(i, "MUL", 2);
next_instruction(i, 2); // 2 arguments.
break;
case MLI:
break;
case DIV:
if (get_arg(i, 1) == 0)
{
set_register_ex(i, 0);
set_register(i, get_arg(i, 0), 0);
}
else
{
set_register_ex(i, get_register_value(i, get_arg(i, 0), 3) / get_arg(i, 1));
set_register(i, get_arg(i, 0), get_register_ex_value(i));
}
debug_opcode(i, "DIV", 2);
next_instruction(i, 2); // 2 arguments.
break;
case DVI:
break;
default:
printf("\n\n%s\n\n\n\t\tInstruction Fault at: [%s%s%i%s%s] -> 0x%x\n\n\n%s\n",
COLORS_BG_RED,
COLORS_BG_BLACK,
COLORS_LIGHT_BLUE,
i->registers->pc,
COLORS_RESET,
COLORS_BG_RED,
i->program->code[i->registers->pc],
COLORS_RESET
);
i->status = 0;
dump_registers(i, 0);
return;
break;
}
// Check the size of the instructions left.
if (i->registers->pc >= i->program->size)
{
i->running = 0;
break;
}
}
}