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#pragma once
#include "Core/TObject.h"
#include "Core/WeakSet.h"
#include "Size.h"
namespace code {
STORM_PKG(core.asm);
class OffsetReference;
/**
* A RefSource that provides an offset rather than a pointer.
*
* The main reason the two are kept separate is to make sure that pointer-references are not
* accidentally treated as offset-references, thus causing confusion for the garbage collector
* (one needs to be scanned, the other does not). Furthermore, we allow for offset-references to
* not refer to anything (they are simply zero), while pointer-references are not.
*
* Additionally, OffsetRefSource objects do not have a Content, since they are simply an
* offset. These offsets may not refer other things, as is the case with pointer-references.
*/
class OffsetSource : public ObjectOn<Compiler> {
STORM_ABSTRACT_CLASS;
friend class OffsetReference;
public:
STORM_CTOR OffsetSource();
STORM_CTOR OffsetSource(Offset offset);
// Set the offset.
void STORM_FN set(Offset offset);
// Make it so that all references in 'from' refers to this instance instead. Keeps 'from'
// updated until there are no more 'Ref's referring to it (Reference instances are updated
// immediately).
void STORM_FN steal(OffsetSource *from);
// Get the current offset.
Offset offset() const;
// Get our title.
virtual Str *STORM_FN title() const ABSTRACT;
// Force update.
void update();
// Get actual source, in case content was stolen.
OffsetSource *STORM_FN findActual();
protected:
// Output.
virtual void STORM_FN toS(StrBuf *to) const;
private:
// Data.
Offset data;
// All non-Ref references referring to this source.
WeakSet<OffsetReference> *refs;
// References stolen by.
OffsetSource *stolenBy;
};
/**
* String-labeled OffsetSource.
*/
class StrOffsetSource : public OffsetSource {
STORM_CLASS;
public:
StrOffsetSource(const wchar *name);
STORM_CTOR StrOffsetSource(Str *name);
STORM_CTOR StrOffsetSource(Str *name, Offset offset);
// Title.
virtual Str *STORM_FN title() const;
private:
// Name.
Str *name;
};
}
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