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select-instructions.rkt
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#lang racket
(require "utilities.rkt"
"constants.rkt"
"utils.rkt")
(provide select-instructions)
(define (pmask t [mask 0])
(match t
[`(Vector) mask]
[`(Vector (Vector . ,_))
(bitwise-ior mask 1)]
[`(Vector ,_) mask]
[`(Vector . ((Vector . ,_) . ,rest))
(pmask `(Vector . ,rest) (arithmetic-shift (bitwise-ior mask 1) 1))]
[`(Vector . (,t . ,rest))
(pmask `(Vector . ,rest) (arithmetic-shift mask 1))]
[else (error "Couldn't make pmask for " t)]))
; second argument of cmp cannot be an immediate, generate temorary mov if it is
(define (cmp-tmp-mov a)
(match (si-atm a)
[(Imm a)
(values `(,(Instr 'movq `(,(Imm a) ,(Reg 'rax)))) (Reg 'rax))]
[_ (values '() a)]))
(define (si-atm e)
(match e
[(Int n) (Imm n)]
[(Var v) (Var v)]
[(Bool #f) (Imm 0)]
[(Bool #t) (Imm 1)]
[(GlobalValue g) (Global g)]
[(HasType x _) (si-atm x)]
[else (error "si-atm unhandled case " e)]))
(define (si-stmt e)
(match e
[(Assign (Var v) (HasType e t)) (si-stmt (Assign (Var v) e))]
[(Assign (Var v) (Int i)) `(,(Instr 'movq `(,(Imm i) ,(Var v))))]
[(Assign (Var v) (Bool b)) `(,(Instr 'movq `(,(si-atm (Bool b)) ,(Var v))))]
[(Assign (Var v) (Var u)) `(,(Instr 'movq `(,(Var u) ,(Var v))))]
[(Assign (Var v) (GlobalValue g)) `(,(Instr 'movq `(,(Global g) ,(Var v))))]
[(Assign (Var v) (Void)) `(,(Instr 'movq `(,(Imm 0) ,(Var v))))]
[(Assign (Var v) (Prim 'read '()))
`(,(Callq `read_int 0)
,(Instr 'movq `(,(Reg 'rax) ,(Var v))))]
[(Assign (Var v) (Prim '- `(,a)))
(let ([a (si-atm a)])
`(,(Instr 'movq `(,a ,(Var v)))
,(Instr 'negq `(,(Var v)))))]
[(Assign (Var v) (Prim '+ `(,a1 ,a2)))
(let ([a1 (si-atm a1)]
[a2 (si-atm a2)])
(cond
; v = (+ v a2)
[(equal? (Var v) a1) `(,(Instr 'addq `(,(si-atm a2) ,(Var v))))]
; v = (+ a1 v)
[(equal? (Var v) a2) `(,(Instr 'addq `(,(si-atm a1) ,(Var v))))]
; v = (+ a1 a2)
[else `(,(Instr 'movq `(,a1 ,(Var v))) ,(Instr 'addq `(,a2 ,(Var v))))]))]
[(Assign (Var v) (Prim 'not `(,(Var v))))
`(,(Instr 'xorq `(,(Imm 1) ,(Var v))))]
[(Assign (Var v) (Prim 'not `(,a)))
(let ([a (si-atm a)])
`(,(Instr 'movq `(,a ,(Var v)))
,(Instr 'xorq `(,(Imm 1) ,(Var v)))))]
[(Assign (Var v) (Prim 'eq? `(,a1 ,a2)))
(let-values ([(tmp a1) (cmp-tmp-mov a1)]
[(a2) (si-atm a2)])
(append tmp
`(,(Instr 'cmpq `(,a2 ,a1))
,(Instr 'set `(e ,(Reg 'al)))
,(Instr 'movzbq `(,(Reg 'al) ,(Var v))))))]
[(Assign (Var v) (Prim '< `(,a1 ,a2)))
(let-values ([(tmp a1) (cmp-tmp-mov a1)]
[(a2) (si-atm a2)])
(append tmp
`(,(Instr 'cmpq `(,a2 ,a1))
,(Instr 'set `(l ,(Reg 'al)))
,(Instr 'movzbq `(,(Reg 'al) ,(Var v))))))]
[(Assign (Var x) (Prim 'vector-ref `(,v ,(Int n))))
`(,(Instr 'movq `(,v ,(Reg 'r11)))
,(Instr 'movq `(,(Deref 'r11 (* 8 (+ n 1))) ,(Var x))))]
[(Assign (Var x) (Prim 'vector-set! `(,v ,(Int n) ,a)))
(let ([a (si-atm a)])
`(,(Instr 'movq `(,v ,(Reg 'r11)))
,(Instr 'movq `(,a ,(Deref 'r11 (* 8 (+ n 1)))))
,(Instr 'movq `(,(Imm 0) ,(Var x)))))]
; Invariant : allocate is only called when it is guaranteed that there is
; enough space
; Invariant : allocate can only appear in rhs of a let
[(Assign (Var v) (Allocate len t))
(let ([tag (bitwise-ior 1 ; In FromSpace, not yet copied
(arithmetic-shift len 1) ; size of tuple
(arithmetic-shift (pmask t) 7))])
`(,(Instr 'movq `(,(Global 'free_ptr) ,(Reg 'r11)))
,(Instr 'addq `(,(Imm (* 8 (+ len 1))) ,(Global 'free_ptr)))
,(Instr 'movq `(,(Imm tag) ,(Deref 'r11 0)))
,(Instr 'movq `(,(Reg 'r11) ,(Var v)))))]
[(Assign (Var v) (Collect bytes))
`(,(Instr 'movq `(,(Reg 'r15) ,(Reg 'rdi)))
,(Instr 'movq `(,(Imm bytes) ,(Reg 'rsi)))
,(Callq 'collect 2))]
[(Assign (Var v) (FunRef f))
`(,(Instr 'leaq `(,(FunRef f) ,(Var v))))]
[(Assign (Var v) (Call fun arg*))
(let ([movs (map (lambda (idx)
(Instr 'movq `(,(si-atm (list-ref arg* idx))
,(list-ref param-reg* idx))))
(range 0 (length arg*)))])
(append movs
`(,(IndirectCallq fun (length arg*))
,(Instr 'movq `(,(Reg 'rax) ,(Var v))))))]
[else (error "si-stmt unhandled case : " e)]))
(define (si-tail e c)
(match e
[(Return (Var v)) `(,(Instr 'movq `(,(Var v) ,(Reg 'rax))) ,(Jmp c))]
[(Return (Int i)) `(,(Instr 'movq `(,(Imm i) ,(Reg 'rax))) ,(Jmp c))]
[(Return (Prim 'read '()))
`(,(Callq 'read_int 0)
,(Jmp c))]
[(Return (Prim '- `(,a)))
(let ([a (si-atm a)])
`(,(Instr 'movq `(,a ,(Reg 'rax)))
,(Instr 'negq `(,(Reg 'rax)))
,(Jmp c)))]
[(Return (Prim '+ `(,a1 ,a2)))
(let ([a1 (si-atm a1)]
[a2 (si-atm a2)])
`(,(Instr 'movq `(,a1 ,(Reg 'rax)))
,(Instr 'addq `(,a2 ,(Reg 'rax)))
,(Jmp c)))]
[(Return (Prim 'vector-ref `(,v ,(Int n))))
`(,(Instr 'movq `(,v ,(Reg 'r11)))
,(Instr 'movq `(,(Deref 'r11 (* 8 (+ n 1))) ,(Reg 'rax)))
,(Jmp c))]
[(Return (Prim 'vector-set! `(,v ,(Int n) ,a)))
(let ([a (si-atm a)])
`(,(Instr 'movq `(,v ,(Reg 'r11)))
,(Instr 'movq `(,a ,(Deref 'r11 (* 8 (+ n 1)))))
,(Instr 'movq `(,(Imm 0) ,(Reg 'rax)))
,(Jmp c)))]
[(Seq stmt tail)
(let ([s (si-stmt stmt)]
[t (si-tail tail c)])
(append s t))]
[(Goto l) `(,(Jmp l))]
[(IfStmt (Prim 'eq? `(,a1 ,a2)) (Goto l1) (Goto l2))
(let-values ([(tmp a1) (cmp-tmp-mov a1)]
[(a2) (si-atm a2)])
(append tmp
`(,(Instr 'cmpq `(,a2 ,a1))
,(JmpIf 'e l1)
,(Jmp l2))))]
[(IfStmt (Prim '< `(,a1 ,a2)) (Goto l1) (Goto l2))
(let-values ([(tmp a1) (cmp-tmp-mov a1)]
[(a2) (si-atm a2)])
(append tmp
`(,(Instr 'cmpq `(,a2 ,a1))
,(JmpIf 'l l1)
,(Jmp l2))))]
; Invariant : grammar restricts to immediate integer references, don't have
; to worry about expressions evaluating to integers
[(IfStmt (Prim 'vector-ref `(,v ,(Int i))) (Goto l1) (Goto l2))
`(,(Instr 'movq `(,v ,(Reg 'r11)))
,(Instr 'cmpq `(,(Imm 1) ,(Deref 'r11 (* 8 (+ i 1)))))
,(JmpIf 'e l1)
,(Jmp l2))]
[(TailCall fun arg*)
(let ([movs (map (lambda (idx)
(Instr 'movq `(,(si-atm (list-ref arg* idx))
,(list-ref param-reg* idx))))
(range 0 (length arg*)))])
(append movs
`(,(TailJmp fun (length arg*)))))]
[else (error "si-tail unhandled case : " e)]))
(define (si-def d)
(match d
[(Def name param* rty info label-tail*)
(let* ([param* (map param-name param*)]
[arg-mov* (for/list ([idx (in-range (length param*))])
(Instr 'movq `(,(list-ref param-reg* idx)
,(Var (list-ref param* idx)))))]
[start-label (gen-start-label name)]
[concl-label (gen-concl-label name)]
[start `(,start-label
. ,(Block '() (append arg-mov*
(si-tail (dict-ref label-tail*
start-label)
concl-label))))]
[rest (for/list ([label-tail label-tail*])
(let ([label (car label-tail)]
[tail (cdr label-tail)])
`(,label . ,(Block '() (si-tail tail concl-label)))))])
(Def name param* 'Integer `((num-params . ,(length param*)) . ,info)
`(,start . ,rest)))]))
(define (gen-start-label name)
(string->symbol (string-append (symbol->string name)
"start")))
(define (gen-concl-label name)
(string->symbol (string-append (symbol->string name)
"conclusion")))
; select-instructions : C0 -> pseudo-x86
(define (select-instructions p)
(match p
[(ProgramDefs info def*)
(ProgramDefs info (map si-def def*))]))