TEN USEFUL THINGS TO DO WHILE YOU ARE IN POLARIS

• pgm.symtab() gives you the Symbol Table for the code. This table is updated when you add or delete Symbols in Expressions
• pgm.stmts() gives a list of the program Statements.

// track variable count usage
class Counter : public Listable
{

public:

INLINE Counter() {
  _count = 1;
}

INLINE ~Counter() {}

// object classes to do work

INLINE incr() { _count++;}

INLINE int number() { 
  return _count;
}

// for Listable

Counter & operator = (const Counter & counter);

INLINE Counter *clone() const { 
  return new Counter( *this ); 
}

INLINE Listable *listable_clone() const {  
  return (Listable *) clone(); 
}

INLINE void print(ostream &o) const {  
  o << "Counter : " << _count; 
}


private: 

int _count;
};

// for usage in constructs
template class TypedCollection;
template class List;
template class Iterator;
template class Assign;
template class RefSet;

template class Map<symbol ,counter="">
template class KeyIterator<symbol ,counter="">
template class ProtoMap<symbol ,counter="">
template class TypedBaseMap<symbol ,counter="">

Map<symbol ,counter=""> * ct_map = new Map<symbol ,counter="">
Symbol sym;
Counter count;

// notice count is cloned as Map takes ownership
ct_map->ins(sym, count.clone());

KeyIterator out(*ct_map, STOP_ON_GHOSTS);
for (; out.valid(); ++out) {
  Symbol & sym = out.current_key();
  Counter & ct = out.current_data();
  cout << sym << " ";
  ct.print(cout);
  cout << endl;
}

One allows change and one does not. Do not mix the two. Also in deleting an object on a list be careful not to blow up the Iterator.A RefList just points to a real List, you cannot delete in a RefList.

There are DominanceFrontiers and other goodies.

It has some good examples of manipulating the code.

However, do not depend solely on them. MAN pages are woefully incomplete.

Asserts will bite you. Read them very carefully and hope you changed very little code.

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