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5.1.2 Stack Manipulation ¶

Push (E) ¶

pushes E on to the control stack.

Pop (E) ¶

pops the top item on the control stack into E.

NPop (N) ¶

If N is positive, N items are popped off of the stack. If N is negative, NIL is pushed onto the stack -N times. N must be a fixnum.

Bind-Null (E) ¶

pushes E (which must be a symbol) and its current value onto the binding stack, and sets the value of E to NIL. Returns NIL.

Bind (Value Symbol) ¶

pushes Symbol (which must be a symbol) and its current value onto the binding stack, and sets the value cell of Symbol to Value. Returns Symbol.

Unbind (N) ¶

undoes the top N bindings on the binding stack.