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revising the procedure application

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This commit is contained in:
dyoo 2011-03-03 15:11:00 -05:00
parent 8ad291e320
commit 6ebef1c206
1 changed files with 41 additions and 18 deletions
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59
compile.rkt
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@ -60,7 +60,6 @@
(make-instruction-sequence `(,(make-AssignPrimOpStatement 'proc
(make-GetControlStackLabel))
,(make-PopEnv (lexical-environment-pop-depth cenv)
;; FIXME: not right
0)
,(make-PopControl)
,(make-GotoStatement (make-Reg 'proc))))]
@ -69,12 +68,40 @@
[(symbol? linkage)
(make-instruction-sequence `(,(make-GotoStatement (make-Label linkage))))]))
(: end-with-linkage (Linkage CompileTimeEnvironment InstructionSequence ->
InstructionSequence))
(define (end-with-linkage linkage cenv instruction-sequence)
(append-instruction-sequences instruction-sequence
(compile-linkage cenv linkage)))
(: end-with-application-linkage (Linkage CompileTimeEnvironment InstructionSequence ->
InstructionSequence))
;; Add linkage for applications; we need to specialize this to preserve tail calls.
(define (end-with-application-linkage linkage cenv instruction-sequence)
(append-instruction-sequences instruction-sequence
(compile-application-linkage cenv linkage)))
(: compile-application-linkage (CompileTimeEnvironment 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-PopControl)
,(make-GotoStatement (make-Reg 'proc))))]
[(eq? linkage 'next)
empty-instruction-sequence]
[(symbol? linkage)
(make-instruction-sequence `(,(make-GotoStatement (make-Label linkage))))]))
(: compile-constant (Constant CompileTimeEnvironment Target Linkage -> InstructionSequence))
(define (compile-constant exp cenv target linkage)
(end-with-linkage linkage
@ -301,31 +328,27 @@
primitive-branch)))
compiled-branch
(compile-proc-appl n target compiled-linkage)
(compile-proc-appl cenv n target compiled-linkage)
primitive-branch
(end-with-linkage linkage
cenv
(make-instruction-sequence
`(,(make-AssignPrimOpStatement
target
(make-ApplyPrimitiveProcedure n)))))
(end-with-application-linkage linkage
cenv
(make-instruction-sequence
`(,(make-AssignPrimOpStatement
target
(make-ApplyPrimitiveProcedure n)))))
after-call))))
(: compile-proc-appl (Natural Target Linkage -> InstructionSequence))
(: compile-proc-appl (CompileTimeEnvironment 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 n target linkage)
(cond [(eq? linkage 'next)
;; This case should be impossible: next linkage can't be used in this position.
(error 'compile "next linkage")]
[(and (eq? target 'val)
(define (compile-proc-appl cenv 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.
@ -341,8 +364,7 @@
(let ([proc-return (make-label 'procReturn)])
(make-instruction-sequence
`(,(make-PushControlFrame proc-return)
,(make-AssignPrimOpStatement 'val
(make-GetCompiledProcedureEntry))
,(make-AssignPrimOpStatement 'val (make-GetCompiledProcedureEntry))
,(make-GotoStatement (make-Reg 'val))
,proc-return
,(make-AssignImmediateStatement target (make-Reg 'val))
@ -356,7 +378,8 @@
(make-instruction-sequence
`(,(make-AssignPrimOpStatement 'val
(make-GetCompiledProcedureEntry))
;; FIXME: shift off the environment?
,(make-PopEnv (max 0 (- (lexical-environment-pop-depth cenv) n))
n)
,(make-GotoStatement (make-Reg 'val))))]
[(and (not (eq? target 'val))