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select-instructions.rkt
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select-instructions.rkt
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#lang racket
(require "type-check-Cif.rkt")
(require "interp-Cif.rkt")
(require "utilities.rkt")
(provide select-instructions)
(define (atm a)
(match a
[(Var x) (Var x)]
[(Int n) (Imm n)]
[(Void) (Imm 0)]
[(Bool #t) (Imm 1)]
[(Bool #f) (Imm 0)]))
(define prim->cc '((eq? . e) (< . l) (<= . le) (> . g) (>= . ge)))
; instruction syntax on pg 22
(define (stmt s) ; returns a list of instructions
(match s
[(Assign (Var x) (Prim 'not (list (Var x))))
(list
(Instr 'xorq (list (Imm 1) (Var x))))]
[(Assign (Var x) (Prim 'not (list a)))
(list
(Instr 'movq (list (atm a) (Var x)))
(Instr 'negq (list (Imm 1) (Var x))))]
[(Assign (Var x) (Prim 'eq? (list a1 a2)))
(list
(Instr 'cmpq (list (atm a2) (atm a1)))
(Instr 'set (list 'e (ByteReg 'al)))
(Instr 'movzbq (list (ByteReg 'al) (Var x))))]
; eq? < <= > >=
[(Assign (Var x) (Prim '< (list a1 a2)))
(list
(Instr 'cmpq (atm a2) (atm a1))
(Instr 'set (list 'l (ByteReg 'al)))
(Instr 'movzbq (list ByteReg 'al) (Var x)))]
[(Assign (Var x) (Prim '<= (list a1 a2)))
(list
(Instr 'cmpq (atm a2) (atm a1))
(Instr 'set (list 'le (ByteReg 'al)))
(Instr 'movzbq (list ByteReg 'al) (Var x)))]
[(Assign (Var x) (Prim '> (list a1 a2)))
(list
(Instr 'cmpq (atm a2) (atm a1))
(Instr 'set (list 'g (ByteReg 'al)))
(Instr 'movzbq (list ByteReg 'al) (Var x)))]
[(Assign (Var x) (Prim '>= (list a1 a2)))
(list
(Instr 'cmpq (atm a2) (atm a1))
(Instr 'set (list 'ge (ByteReg 'al)))
(Instr 'movzbq (list ByteReg 'al) (Var x)))]
[(Assign (Var x) (Prim '+ (list (Var x) a2)))
(list
(Instr 'addq (list (atm a2) (Var x)))
)
]
[(Assign (Var x) (Prim '+ (list a1 (Var x))))
(list
(Instr 'addq (list (atm a1) (Var x)))
)
]
[(Assign (Var x) (Prim '+ (list a1 a2)))
(list
(Instr 'movq (list (atm a1) (Var x)))
(Instr 'addq (list (atm a2) (Var x)))
)
]
[(Assign (Var x) (Prim '- (list (Var x) a2)))
(list
(Instr 'subq ((atm a2) (Var x)))
)
]
[(Assign (Var x) (Prim '- (list a1 a2)))
(list
(Instr 'movq (list (atm a1) (Var x)))
(Instr 'subq (list (atm a2) (Var x)))
)
]
[(Assign (Var x) (Prim '- (list (Var x))))
(list
(Instr 'negq ((Var x)))
)
]
[(Assign (Var x) (Prim '- (list a)))
(list
(Instr 'movq (list (atm a) (Var x)))
(Instr 'negq (list (Var x)))
)
]
[(Assign (Var x) (Prim 'read (list)))
(list
(Callq 'read_int 0)
(Instr 'movq (list (Reg 'rax) (Var x)))
)
]
[(Assign (Var x) (Void))
(list
(Instr 'movq (list (Imm 0) (Var x)))
)]
[(Assign (Var x) (Int n))
(list
(Instr 'movq (list (Imm n) (Var x)))
)
]
[(Assign (Var x) (Bool b))
(list
(Instr 'movq (list (Imm (if b 1 0)) (Var x))))]
[(Assign (Var x) (Var x))
(list)
]
[(Assign (Var x) (Var y))
(list
(Instr 'movq (list (Var y) (Var x)))
)
]
))
(define (tail t) ; returns a list of instructions
(match t
[(Goto l)
(list
(Jmp l))]
[(IfStmt (Prim cmp (list a1 a2)) (Goto l1) (Goto l2)) #:when (member cmp (list 'eq? '< '<= '> '>=))
(list
(Instr 'cmpq (list (atm a2) (atm a1)))
(JmpIf (dict-ref prim->cc cmp) l1)
(Jmp l2))]
[(Return a)
(list
(Instr 'movq (list (atm a) (Reg 'rax)))
(Jmp 'conclusion)
)
]
[(Seq s t)
(append (stmt s) (tail t))]))
(define (make-block label/tail)
(define l (car label/tail))
(define t (cdr label/tail))
(cons l (Block '() (tail t))))
(define (select-instructions p)
(match p
[(CProgram info label/tails)
(X86Program info (map make-block label/tails))]))