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Require Import QhasmCommon QhasmEvalCommon.
Require Import List NPeano.
Module Qhasm.
Import ListNotations.
Import QhasmEval.
Definition State := State.
(* Program Types *)
Inductive QhasmStatement :=
| QAssign: Assignment -> QhasmStatement
| QOp: Operation -> QhasmStatement
| QCond: Conditional -> Label -> QhasmStatement
| QLabel: Label -> QhasmStatement
| QCall: Label -> QhasmStatement
| QRet: QhasmStatement.
Hint Constructors QhasmStatement.
Definition Program := list QhasmStatement.
(* Only execute while loops a fixed number of times.
TODO (rsloan): can we do any better? *)
Fixpoint getLabelMap' (prog: Program) (cur: LabelMap) (index: nat): LabelMap :=
match prog with
| p :: ps =>
match p with
| QLabel label => @getLabelMap' ps (NatM.add label index cur) (S index)
| _ => @getLabelMap' ps cur (S index)
end
| [] => cur
end.
Definition getLabelMap (prog: Program): LabelMap :=
getLabelMap' prog (NatM.empty nat) O.
Inductive QhasmEval: nat -> Program -> LabelMap -> State -> State -> Prop :=
| QEOver: forall p n m s, (n > (length p))%nat -> QhasmEval n p m s s
| QEZero: forall p s m, QhasmEval O p m s s
| QEAssign: forall n p m a s s' s'',
(nth_error p n) = Some (QAssign a)
-> evalAssignment a s = Some s'
-> QhasmEval (S n) p m s' s''
-> QhasmEval n p m s s''
| QEOp: forall n p m a s s' s'',
(nth_error p n) = Some (QOp a)
-> evalOperation a s = Some s'
-> QhasmEval (S n) p m s' s''
-> QhasmEval n p m s s''
| QECondTrue: forall (n loc next: nat) p m c l s s',
(nth_error p n) = Some (QCond c l)
-> evalCond c s = Some true
-> NatM.find l m = Some loc
-> QhasmEval loc p m s s'
-> QhasmEval n p m s s'
| QECondFalse: forall (n loc next: nat) p m c l s s',
(nth_error p n) = Some (QCond c l)
-> evalCond c s = Some false
-> QhasmEval (S n) p m s s'
-> QhasmEval n p m s s'
| QERet: forall (n n': nat) s s' s'' p m,
(nth_error p n) = Some QRet
-> popRet s = Some (s', n')
-> QhasmEval n' p m s' s''
-> QhasmEval n p m s s''
| QECall: forall (w n n' lbl: nat) s s' s'' p m,
(nth_error p n) = Some (QCall lbl)
-> NatM.find lbl m = Some n'
-> QhasmEval n' p m (pushRet (S n) s') s''
-> QhasmEval n p m s s''
| QELabel: forall n p m l s s',
(nth_error p n) = Some (QLabel l)
-> QhasmEval (S n) p m s s'
-> QhasmEval n p m s s'.
Definition evaluatesTo := fun p => @QhasmEval O p (getLabelMap p).
(* world peace *)
End Qhasm.
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