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/*****
* frame.h
* Andy Hammerlindl 2002/07/22
*
* Describes the frame levels for the functions of the language.
* Also creates accesses for the variable for automated loading
* and saving of variables.
*****/
#ifndef FRAME_H
#define FRAME_H
#include <cassert>
#include "access.h"
namespace trans {
class frame : public gc {
frame *parent;
size_t numFormals;
Int numLocals;
#ifdef DEBUG_FRAME
string name;
#endif
public:
frame(string name, frame *parent, size_t numFormals)
: parent(parent), numFormals(numFormals), numLocals(0)
#ifdef DEBUG_FRAME
, name(name)
#endif
{}
size_t getNumFormals() {
return numFormals;
}
Int getNumLocals() {
return numLocals;
}
frame *getParent() {
return parent;
}
Int size() {
return (Int) (1+numFormals+numLocals);
}
access *accessFormal(size_t index) {
assert(index < numFormals);
return new localAccess((Int) (1 + index), this);
}
access *allocLocal() {
return new localAccess((Int) (1 + numFormals + numLocals++), this);
}
// Checks if the frame f is a descendent of this frame.
// For our purposes, a frame is its own descendant.
bool isDescendant(frame *f)
{
while (f != 0) {
if (f == this)
return true;
f = f->parent;
}
return false;
}
};
inline void print(ostream& out, frame *f) {
out << f;
if (f != 0) {
out << " -> ";
print(out, f->getParent());
}
}
} // namespace trans
#endif
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