|
public static RoundUp ( |
||
| value | ||
| alignment | ||
| Результат | ||
public void DefineStruct(IReadOnlyList <Tuple <String, ExprType> > attribs)
{
if (this.IsComplete)
{
throw new InvalidOperationException("Cannot redefine a struct.");
}
this._attribs = new List <Utils.StoreEntry>();
Int32 offset = 0;
Int32 struct_alignment = 0;
foreach (Tuple <String, ExprType> attrib in attribs)
{
String name = attrib.Item1;
ExprType type = attrib.Item2;
Int32 attrib_alignment = type.Alignment;
// All attributes must be aligned.
// This means that the alignment of the struct is the largest attribute alignment.
struct_alignment = Math.Max(struct_alignment, attrib_alignment);
// Make sure all attributes are put into aligned places.
offset = Utils.RoundUp(offset, attrib_alignment);
this._attribs.Add(new Utils.StoreEntry(name, type, offset));
offset += type.SizeOf;
}
this._size_of = Utils.RoundUp(offset, struct_alignment);
}
// PushEntry
// =========
// input: loc, name, Type
// output: Scope
// returns a new scope with everything the same as this, excpet for a new entry
//
public Scope PushEntry(EntryKind loc, String name, ExprType type)
{
Scope scope = new Scope(this);
switch (loc)
{
case EntryKind.STACK:
scope.esp_pos -= Utils.RoundUp(type.SizeOf, 4);
scope.locals.Add(new Utils.StoreEntry(name, type, scope.esp_pos));
break;
case EntryKind.GLOBAL:
scope.globals.Add(new Utils.StoreEntry(name, type, 0));
break;
case EntryKind.TYPEDEF:
scope.typedefs.Add(new Utils.StoreEntry(name, type, 0));
break;
default:
return(null);
}
return(scope);
}
