528 lines
22 KiB
Racket
528 lines
22 KiB
Racket
#lang typed/racket/base
|
|
|
|
(require "expression-structs.rkt"
|
|
"lexical-structs.rkt"
|
|
"il-structs.rkt"
|
|
racket/list)
|
|
|
|
(provide (rename-out [-compile compile])
|
|
compile-procedure-call
|
|
append-instruction-sequences
|
|
adjust-target-depth)
|
|
|
|
|
|
|
|
(: -compile (ExpressionCore Target Linkage -> (Listof Statement)))
|
|
(define (-compile exp target linkage)
|
|
(statements
|
|
(compile exp
|
|
0
|
|
target
|
|
linkage)))
|
|
|
|
|
|
|
|
(: compile (ExpressionCore Natural Target Linkage -> InstructionSequence))
|
|
;; Compiles an expression into an instruction sequence.
|
|
(define (compile exp cenv target linkage)
|
|
(cond
|
|
[(Top? exp)
|
|
(compile-top exp cenv target linkage)]
|
|
[(Constant? exp)
|
|
(compile-constant exp cenv target linkage)]
|
|
[(LocalRef? exp)
|
|
(compile-local-reference exp cenv target linkage)]
|
|
[(ToplevelRef? exp)
|
|
(compile-toplevel-reference exp cenv target linkage)]
|
|
[(ToplevelSet? exp)
|
|
(compile-toplevel-set exp cenv target linkage)]
|
|
[(Branch? exp)
|
|
(compile-branch exp cenv target linkage)]
|
|
[(Lam? exp)
|
|
(compile-lambda exp cenv target linkage)]
|
|
[(Seq? exp)
|
|
(compile-sequence (Seq-actions exp)
|
|
cenv
|
|
target
|
|
linkage)]
|
|
[(App? exp)
|
|
(compile-application exp cenv target linkage)]
|
|
[(Let1? exp)
|
|
(compile-let1 exp cenv target linkage)]
|
|
[(LetVoid? exp)
|
|
(compile-let-void exp cenv target linkage)]
|
|
[(InstallValue? exp)
|
|
(compile-install-value exp cenv target linkage)]
|
|
[(BoxEnv? exp)
|
|
(compile-box-environment-value exp cenv target linkage)]))
|
|
|
|
|
|
|
|
|
|
(: compile-top (Top Natural Target Linkage -> InstructionSequence))
|
|
(define (compile-top top cenv target linkage)
|
|
(let*: ([names : (Listof (U Symbol False)) (Prefix-names (Top-prefix top))])
|
|
(append-instruction-sequences
|
|
(make-instruction-sequence
|
|
`(,(make-PerformStatement (make-ExtendEnvironment/Prefix! names))))
|
|
(compile (Top-code top) (add1 cenv) target linkage))))
|
|
|
|
|
|
|
|
;; Add linkage for expressions.
|
|
(: end-with-linkage (Linkage Natural InstructionSequence -> InstructionSequence))
|
|
(define (end-with-linkage linkage cenv instruction-sequence)
|
|
(append-instruction-sequences instruction-sequence
|
|
(compile-linkage cenv linkage)))
|
|
|
|
|
|
(: end-with-compiled-application-linkage (Linkage Natural InstructionSequence ->
|
|
InstructionSequence))
|
|
;; Add linkage for applications; we need to specialize this to preserve tail calls.
|
|
(define (end-with-compiled-application-linkage linkage cenv instruction-sequence)
|
|
(append-instruction-sequences instruction-sequence
|
|
(compile-application-linkage cenv linkage)))
|
|
|
|
|
|
|
|
(: compile-linkage (Natural Linkage -> InstructionSequence))
|
|
(define (compile-linkage cenv linkage)
|
|
(cond
|
|
[(eq? linkage 'return)
|
|
(make-instruction-sequence `(,(make-AssignPrimOpStatement 'proc
|
|
(make-GetControlStackLabel))
|
|
,(make-PopEnvironment cenv 0)
|
|
,(make-PopControlFrame)
|
|
,(make-GotoStatement (make-Reg 'proc))))]
|
|
[(eq? linkage 'next)
|
|
empty-instruction-sequence]
|
|
[(symbol? linkage)
|
|
(make-instruction-sequence `(,(make-GotoStatement (make-Label linkage))))]))
|
|
|
|
|
|
(: compile-application-linkage (Natural Linkage -> InstructionSequence))
|
|
;; Like compile-linkage, but the special case for 'return linkage already assumes
|
|
;; the stack has been appropriately popped.
|
|
(define (compile-application-linkage cenv linkage)
|
|
(cond
|
|
[(eq? linkage 'return)
|
|
(make-instruction-sequence `(,(make-AssignPrimOpStatement 'proc (make-GetControlStackLabel))
|
|
,(make-PopControlFrame)
|
|
,(make-GotoStatement (make-Reg 'proc))))]
|
|
[(eq? linkage 'next)
|
|
(make-instruction-sequence `(,(make-PopEnvironment cenv 0)))]
|
|
[(symbol? linkage)
|
|
(make-instruction-sequence `(,(make-PopEnvironment cenv 0)
|
|
,(make-GotoStatement (make-Label linkage))))]))
|
|
|
|
|
|
|
|
(: compile-constant (Constant Natural Target Linkage -> InstructionSequence))
|
|
(define (compile-constant exp cenv target linkage)
|
|
(end-with-linkage linkage
|
|
cenv
|
|
(make-instruction-sequence
|
|
`(,(make-AssignImmediateStatement target (make-Const (Constant-v exp)))))))
|
|
|
|
|
|
|
|
(: compile-local-reference (LocalRef Natural Target Linkage -> InstructionSequence))
|
|
(define (compile-local-reference exp cenv target linkage)
|
|
(end-with-linkage linkage
|
|
cenv
|
|
(make-instruction-sequence
|
|
`(,(make-AssignImmediateStatement
|
|
target
|
|
(make-EnvLexicalReference (LocalRef-depth exp)
|
|
(LocalRef-unbox? exp)))))))
|
|
|
|
|
|
(: compile-toplevel-reference (ToplevelRef Natural Target Linkage -> InstructionSequence))
|
|
(define (compile-toplevel-reference exp cenv target linkage)
|
|
(end-with-linkage linkage
|
|
cenv
|
|
(make-instruction-sequence
|
|
`(,(make-PerformStatement (make-CheckToplevelBound!
|
|
(ToplevelRef-depth exp)
|
|
(ToplevelRef-pos exp)))
|
|
,(make-AssignImmediateStatement
|
|
target
|
|
(make-EnvPrefixReference (ToplevelRef-depth exp)
|
|
(ToplevelRef-pos exp)))))))
|
|
|
|
|
|
(: compile-toplevel-set (ToplevelSet Natural Target Linkage -> InstructionSequence))
|
|
(define (compile-toplevel-set exp cenv target linkage)
|
|
(let* ([var (ToplevelSet-name exp)]
|
|
[lexical-pos (make-EnvPrefixReference (ToplevelSet-depth exp)
|
|
(ToplevelSet-pos exp))])
|
|
(let ([get-value-code
|
|
(compile (ToplevelSet-value exp) cenv lexical-pos
|
|
'next)])
|
|
(end-with-linkage
|
|
linkage
|
|
cenv
|
|
(append-instruction-sequences
|
|
get-value-code
|
|
(make-instruction-sequence `(,(make-AssignImmediateStatement target (make-Const (void))))))))))
|
|
|
|
|
|
(: compile-branch (Branch Natural Target Linkage -> InstructionSequence))
|
|
(define (compile-branch exp cenv target linkage)
|
|
(let ([t-branch (make-label 'trueBranch)]
|
|
[f-branch (make-label 'falseBranch)]
|
|
[after-if (make-label 'afterIf)])
|
|
(let ([consequent-linkage
|
|
(if (eq? linkage 'next)
|
|
after-if
|
|
linkage)])
|
|
(let ([p-code (compile (Branch-predicate exp) cenv 'val 'next)]
|
|
[c-code (compile (Branch-consequent exp) cenv target consequent-linkage)]
|
|
[a-code (compile (Branch-alternative exp) cenv target linkage)])
|
|
(append-instruction-sequences p-code
|
|
(append-instruction-sequences
|
|
(make-instruction-sequence
|
|
`(,(make-TestAndBranchStatement 'false?
|
|
'val
|
|
f-branch)
|
|
))
|
|
(append-instruction-sequences
|
|
(append-instruction-sequences t-branch c-code)
|
|
(append-instruction-sequences f-branch a-code))
|
|
after-if))))))
|
|
|
|
|
|
(: compile-sequence ((Listof Expression) Natural Target Linkage -> InstructionSequence))
|
|
(define (compile-sequence seq cenv target linkage)
|
|
;; All but the last will use 'next linkage.
|
|
(if (last-exp? seq)
|
|
(compile (first-exp seq) cenv target linkage)
|
|
(append-instruction-sequences (compile (first-exp seq) cenv target 'next)
|
|
(compile-sequence (rest-exps seq) cenv target linkage))))
|
|
|
|
|
|
(: compile-lambda (Lam Natural Target Linkage -> InstructionSequence))
|
|
;; Write out code for lambda expressions.
|
|
;; The lambda will close over the free variables.
|
|
(define (compile-lambda exp cenv target linkage)
|
|
(let*: ([proc-entry : Symbol (make-label 'entry)]
|
|
[after-lambda : Symbol (make-label 'afterLambda)]
|
|
[lambda-linkage : Linkage
|
|
(if (eq? linkage 'next)
|
|
after-lambda
|
|
linkage)])
|
|
(append-instruction-sequences
|
|
(end-with-linkage
|
|
lambda-linkage
|
|
cenv
|
|
(make-instruction-sequence
|
|
`(,(make-AssignPrimOpStatement
|
|
target
|
|
(make-MakeCompiledProcedure proc-entry
|
|
(Lam-num-parameters exp)
|
|
(Lam-closure-map exp)
|
|
(Lam-name exp))))))
|
|
(compile-lambda-body exp proc-entry)
|
|
after-lambda)))
|
|
|
|
|
|
(: compile-lambda-body (Lam Linkage -> InstructionSequence))
|
|
;; Compiles the body of the lambda in the appropriate environment.
|
|
(define (compile-lambda-body exp proc-entry)
|
|
(append-instruction-sequences
|
|
(make-instruction-sequence
|
|
`(,proc-entry
|
|
,(make-PerformStatement (make-InstallClosureValues!))))
|
|
(compile (Lam-body exp)
|
|
(+ (Lam-num-parameters exp)
|
|
(length (Lam-closure-map exp)))
|
|
'val
|
|
'return)))
|
|
|
|
|
|
|
|
|
|
;; FIXME: I need to implement important special cases.
|
|
;; 1. We may be able to open-code if the operator is primitive
|
|
;; 2. We may have a static location to jump to if the operator is lexically scoped.
|
|
(: compile-application (App Natural Target Linkage -> InstructionSequence))
|
|
(define (compile-application exp cenv target linkage)
|
|
(let* ([extended-cenv (+ cenv (length (App-operands exp)))]
|
|
[proc-code (compile (App-operator exp)
|
|
extended-cenv
|
|
(if (empty? (App-operands exp))
|
|
'proc
|
|
(make-EnvLexicalReference
|
|
(ensure-natural (sub1 (length (App-operands exp))))
|
|
#f))
|
|
'next)]
|
|
[operand-codes (map (lambda: ([operand : Expression]
|
|
[target : Target])
|
|
(compile operand extended-cenv target 'next))
|
|
(App-operands exp)
|
|
(build-list (length (App-operands exp))
|
|
(lambda: ([i : Natural])
|
|
(if (< i (sub1 (length (App-operands exp))))
|
|
(make-EnvLexicalReference i #f)
|
|
'val))))])
|
|
|
|
(append-instruction-sequences
|
|
(make-instruction-sequence `(,(make-PushEnvironment (length (App-operands exp)) #f)))
|
|
proc-code
|
|
(juggle-operands operand-codes)
|
|
(compile-procedure-call cenv
|
|
extended-cenv
|
|
(length (App-operands exp))
|
|
target linkage))))
|
|
|
|
|
|
|
|
(: juggle-operands ((Listof InstructionSequence) -> InstructionSequence))
|
|
;; Installs the operators. At the end of this,
|
|
;; the procedure lives in 'proc, and the operands on the environment stack.
|
|
(define (juggle-operands operand-codes)
|
|
(let: loop : InstructionSequence ([ops : (Listof InstructionSequence) operand-codes])
|
|
(cond
|
|
;; If there are no operands, no need to juggle.
|
|
[(null? ops)
|
|
(make-instruction-sequence empty)]
|
|
[(null? (rest ops))
|
|
(let: ([n : Natural (ensure-natural (sub1 (length operand-codes)))])
|
|
;; The last operand needs to be handled specially: it currently lives in
|
|
;; val. We move the procedure at env[n] over to proc, and move the
|
|
;; last operand at 'val into env[n].
|
|
(append-instruction-sequences
|
|
(car ops)
|
|
(make-instruction-sequence
|
|
`(,(make-AssignImmediateStatement 'proc
|
|
(make-EnvLexicalReference n #f))
|
|
,(make-AssignImmediateStatement (make-EnvLexicalReference n #f)
|
|
(make-Reg 'val))))))]
|
|
[else
|
|
;; Otherwise, add instructions to juggle the operator and operands in the stack.
|
|
(append-instruction-sequences (car ops)
|
|
(loop (rest ops)))])))
|
|
|
|
|
|
|
|
(: compile-procedure-call (Natural Natural
|
|
Natural Target Linkage
|
|
->
|
|
InstructionSequence))
|
|
;; Assumes the procedure value has been loaded into the proc register.
|
|
;; n is the number of arguments passed in.
|
|
;; cenv is the compile-time enviroment before arguments have been shifted in.
|
|
;; extended-cenv is the compile-time environment after arguments have been shifted in.
|
|
(define (compile-procedure-call cenv extended-cenv n target linkage)
|
|
(let ([primitive-branch (make-label 'primitiveBranch)]
|
|
[compiled-branch (make-label 'compiledBranch)]
|
|
[after-call (make-label 'afterCall)])
|
|
(let ([compiled-linkage (if (eq? linkage 'next) after-call linkage)])
|
|
(append-instruction-sequences
|
|
(make-instruction-sequence
|
|
`(,(make-TestAndBranchStatement 'primitive-procedure?
|
|
'proc
|
|
primitive-branch)))
|
|
|
|
compiled-branch
|
|
(make-instruction-sequence
|
|
`(,(make-PerformStatement (make-CheckClosureArity! n))))
|
|
(end-with-compiled-application-linkage
|
|
compiled-linkage
|
|
extended-cenv
|
|
(compile-proc-appl cenv extended-cenv n target compiled-linkage))
|
|
|
|
primitive-branch
|
|
(end-with-linkage
|
|
linkage
|
|
cenv
|
|
(make-instruction-sequence
|
|
`(,(make-AssignPrimOpStatement
|
|
;; Optimization: we put the result directly in the registers, or in
|
|
;; the appropriate spot on the stack. This takes into account the popenviroment
|
|
;; that happens right afterwards.
|
|
(adjust-target-depth target n)
|
|
(make-ApplyPrimitiveProcedure n after-call))
|
|
,(make-PopEnvironment n 0))))
|
|
|
|
after-call))))
|
|
|
|
|
|
|
|
(: compile-proc-appl (Natural Natural Natural Target Linkage -> InstructionSequence))
|
|
;; Three fundamental cases for general compiled-procedure application.
|
|
;; 1. Non-tail calls that write to val
|
|
;; 2. Calls in argument position that write to the environment
|
|
;; 3. Tail calls.
|
|
;; The Other cases should be excluded.
|
|
(define (compile-proc-appl cenv-without-args cenv-with-args n target linkage)
|
|
(cond [(and (eq? target 'val)
|
|
(not (eq? linkage 'return)))
|
|
;; This case happens for a function call that isn't in
|
|
;; tail position.
|
|
(make-instruction-sequence
|
|
`(,(make-PushControlFrame linkage)
|
|
,(make-AssignPrimOpStatement 'val (make-GetCompiledProcedureEntry))
|
|
,(make-GotoStatement (make-Reg 'val))))]
|
|
|
|
[(and (not (eq? target 'val))
|
|
(not (eq? linkage 'return)))
|
|
;; This case happens for evaluating arguments, since the
|
|
;; arguments are being installed into the scratch space.
|
|
(let ([proc-return (make-label 'procReturn)])
|
|
(make-instruction-sequence
|
|
`(,(make-PushControlFrame proc-return)
|
|
,(make-AssignPrimOpStatement 'val (make-GetCompiledProcedureEntry))
|
|
,(make-GotoStatement (make-Reg 'val))
|
|
,proc-return
|
|
,(make-AssignImmediateStatement target (make-Reg 'val))
|
|
,(make-GotoStatement (make-Label linkage)))))]
|
|
|
|
[(and (eq? target 'val)
|
|
(eq? linkage 'return))
|
|
;; This case happens when we're in tail position.
|
|
;; We clean up the stack right before the jump, and do not add
|
|
;; to the control stack.
|
|
(make-instruction-sequence
|
|
`(,(make-AssignPrimOpStatement 'val
|
|
(make-GetCompiledProcedureEntry))
|
|
,(make-PopEnvironment (ensure-natural (- cenv-with-args n))
|
|
n)
|
|
,(make-GotoStatement (make-Reg 'val))))]
|
|
|
|
[(and (not (eq? target 'val))
|
|
(eq? linkage 'return))
|
|
;; This case happens for set!, which may install the results of an
|
|
;; application directly into the environment.
|
|
(let ([proc-return (make-label 'procReturn)])
|
|
(end-with-linkage linkage
|
|
cenv-without-args
|
|
(make-instruction-sequence
|
|
`(,(make-PushControlFrame proc-return)
|
|
,(make-AssignPrimOpStatement 'val (make-GetCompiledProcedureEntry))
|
|
,(make-GotoStatement (make-Reg 'val))
|
|
,proc-return
|
|
,(make-AssignImmediateStatement target (make-Reg 'val))))))]))
|
|
|
|
|
|
(: compile-let1 (Let1 Natural Target Linkage -> InstructionSequence))
|
|
(define (compile-let1 exp cenv target linkage)
|
|
(let*: ([rhs-code : InstructionSequence
|
|
(compile (Let1-rhs exp)
|
|
(add1 cenv)
|
|
(make-EnvLexicalReference 0 #f)
|
|
'next)]
|
|
[after-let1 : Symbol (make-label 'afterLetOne)]
|
|
[after-body-code : Symbol (make-label 'afterLetBody)]
|
|
[extended-cenv : Natural (add1 cenv)]
|
|
[let-linkage : Linkage
|
|
(cond
|
|
[(eq? linkage 'next)
|
|
'next]
|
|
[(eq? linkage 'return)
|
|
'return]
|
|
[(symbol? linkage)
|
|
after-body-code])]
|
|
[body-target : Target (adjust-target-depth target 1)]
|
|
[body-code : InstructionSequence
|
|
(compile (Let1-body exp) extended-cenv body-target let-linkage)])
|
|
(end-with-linkage
|
|
linkage
|
|
extended-cenv
|
|
(append-instruction-sequences
|
|
(make-instruction-sequence `(,(make-PushEnvironment 1 #f)))
|
|
rhs-code
|
|
body-code
|
|
after-body-code
|
|
(make-instruction-sequence `(,(make-PopEnvironment 1 0)))
|
|
after-let1))))
|
|
|
|
|
|
|
|
(: compile-let-void (LetVoid Natural Target Linkage -> InstructionSequence))
|
|
(define (compile-let-void exp cenv target linkage)
|
|
(let*: ([n : Natural (LetVoid-count exp)]
|
|
[after-let : Symbol (make-label 'afterLet)]
|
|
[after-body-code : Symbol (make-label 'afterLetBody)]
|
|
[extended-cenv : Natural (+ cenv (LetVoid-count exp))]
|
|
[let-linkage : Linkage
|
|
(cond
|
|
[(eq? linkage 'next)
|
|
'next]
|
|
[(eq? linkage 'return)
|
|
'return]
|
|
[(symbol? linkage)
|
|
after-body-code])]
|
|
[body-target : Target (adjust-target-depth target n)]
|
|
[body-code : InstructionSequence
|
|
(compile (LetVoid-body exp) extended-cenv body-target let-linkage)])
|
|
(end-with-linkage
|
|
linkage
|
|
extended-cenv
|
|
(append-instruction-sequences
|
|
(make-instruction-sequence `(,(make-PushEnvironment n (LetVoid-boxes? exp))))
|
|
body-code
|
|
after-body-code
|
|
(make-instruction-sequence `(,(make-PopEnvironment n 0)))
|
|
after-let))))
|
|
|
|
|
|
(: compile-install-value (InstallValue Natural Target Linkage -> InstructionSequence))
|
|
(define (compile-install-value exp cenv target linkage)
|
|
(compile (InstallValue-body exp)
|
|
cenv
|
|
(make-EnvLexicalReference (InstallValue-depth exp) (InstallValue-box? exp))
|
|
linkage))
|
|
|
|
|
|
|
|
(: compile-box-environment-value (BoxEnv Natural Target Linkage -> InstructionSequence))
|
|
(define (compile-box-environment-value exp cenv target linkage)
|
|
(append-instruction-sequences
|
|
(make-instruction-sequence
|
|
`(,(make-AssignPrimOpStatement (make-EnvLexicalReference (BoxEnv-depth exp) #f)
|
|
(make-MakeBoxedEnvironmentValue (BoxEnv-depth exp)))))
|
|
(compile (BoxEnv-body exp) cenv target linkage)))
|
|
|
|
|
|
(: append-instruction-sequences (InstructionSequence * -> InstructionSequence))
|
|
(define (append-instruction-sequences . seqs)
|
|
(append-seq-list seqs))
|
|
|
|
(: append-2-sequences (InstructionSequence InstructionSequence -> InstructionSequence))
|
|
(define (append-2-sequences seq1 seq2)
|
|
(make-instruction-sequence
|
|
(append (statements seq1) (statements seq2))))
|
|
|
|
(: append-seq-list ((Listof InstructionSequence) -> InstructionSequence))
|
|
(define (append-seq-list seqs)
|
|
(if (null? seqs)
|
|
empty-instruction-sequence
|
|
(append-2-sequences (car seqs)
|
|
(append-seq-list (cdr seqs)))))
|
|
|
|
|
|
(: ensure-natural (Integer -> Natural))
|
|
(define (ensure-natural n)
|
|
(if (>= n 0)
|
|
n
|
|
(error 'ensure-natural "Not a natural: ~s\n" n)))
|
|
|
|
|
|
|
|
(: adjust-target-depth (Target Natural -> Target))
|
|
(define (adjust-target-depth target n)
|
|
(cond
|
|
[(eq? target 'val)
|
|
target]
|
|
[(eq? target 'proc)
|
|
target]
|
|
[(EnvLexicalReference? target)
|
|
(make-EnvLexicalReference (+ n (EnvLexicalReference-depth target))
|
|
(EnvLexicalReference-unbox? target))]
|
|
[(EnvPrefixReference? target)
|
|
(make-EnvPrefixReference (+ n (EnvPrefixReference-depth target))
|
|
(EnvPrefixReference-pos target))]
|
|
[(PrimitivesReference? target)
|
|
target]))
|