public override void visit(DynamicDispatch ddisp)
{
int ar_size = AR_BASE_SIZE + ddisp.actual.Length;
emit_push(ar_size);
emit_sw("fp", ar_size * WORD_SIZE, "sp");
emit_sw("s0", ar_size * WORD_SIZE - WORD_SIZE, "sp");
int formal_offset = 8;
foreach (var e in ddisp.actual)
{
e.accept(this);
emit_sw("a0", formal_offset, "sp");
formal_offset += WORD_SIZE;
}
emit_addiu("fp", "sp", 4);
ddisp.obj.accept(this);
emit_lw("t1", 8, "a0");
var tmp = method_tbl[ddisp.obj.type.value];
emit_lw("t1", tmp[ddisp.method.value] * WORD_SIZE, "t1");
emit_jalr("t1");
}
public override void visit(DynamicDispatch dyn)
{
List <Symbol> disptypes = new List <Symbol>();
// get type of object that dispatches
dyn.obj.accept(this);
Symbol obj_type = dyn.obj.type;
// get types of all arguments to dispatch
foreach (var expr in dyn.actual)
{
expr.accept(this);
disptypes.Add(expr.type);
}
if (obj_type == curr_class)
{
obj_type = curr_class;
}
if (!mtbl[obj_type].ContainsKey(dyn.method))
{
error(dyn, "method " + dyn.method.value + " is not defined in this class");
dyn.type = Constants.OBJECT;
return;
}
bool result = true;
for (int i = 0; i < disptypes.Count; i++)
{
if (!is_subtype(disptypes[i], mtbl[obj_type][dyn.method][i]))
{
result = false;
break;
}
}
if (result)
{
int length = mtbl[obj_type][dyn.method].Count;
dyn.type = mtbl[obj_type][dyn.method][length - 1];
}
else
{
error(dyn, "type mismatch in one of the arguments of the dispatch");
dyn.type = Constants.OBJECT;
}
}
public override void visit(DynamicDispatch dynamicDispatch)
{
for (int i = 0; i < depth * 2; i++)
{
sw.Write(" ");
}
depth++;
sw.WriteLine("_dynamicDispach (" + dynamicDispatch.method + ") : " + dynamicDispatch.type);
dynamicDispatch.obj.accept(this);
foreach (var item in dynamicDispatch.actual)
{
item.accept(this);
}
depth--;
}
public abstract void visit(DynamicDispatch dynamicDispatch);