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better compiler handling of unused local bindings where the RHS either doesn't obviously produce a single value or is discovered to be unused late in bytecode compilation; initial Scribble support for printing qq-style results

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svn: r18737

original commit: c5ac9f23ec
This commit is contained in:
Matthew Flatt 2010-04-06 15:52:36 +00:00
parent 3832a4ae1a
commit abd90494f9
4 changed files with 18 additions and 11 deletions
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4
collects/compiler/decompile.ss
View File

@ -207,9 +207,9 @@
,@(map (lambda (lam)
(decompile-lam lam globs stack closed))
lams))]
[(struct let-one (rhs body flonum?))
[(struct let-one (rhs body flonum? unused?))
(let ([id (or (extract-id rhs)
(gensym 'local))])
(gensym (if unused? 'unused 'local)))])
`(let ([,id ,(let ([v (decompile-expr rhs globs (cons id stack) closed)])
(if flonum?
(list '#%as-flonum v)

15
collects/compiler/zo-marshal.ss
View File

@ -160,7 +160,7 @@
[(struct case-lam (name lams))
(traverse-data name visit)
(for-each (lambda (lam) (traverse-lam lam visit)) lams)]
[(struct let-one (rhs body flonum?))
[(struct let-one (rhs body flonum? unused?))
(traverse-expr rhs visit)
(traverse-expr body visit)]
[(struct let-void (count boxes? body))
@ -297,7 +297,8 @@
CPT_PATH
CPT_CLOSURE
CPT_DELAY_REF
CPT_PREFAB)
CPT_PREFAB
CPT_LET_ONE_UNUSED)
(define-enum
0
@ -314,7 +315,7 @@
APPVALS_EXPD
SPLICE_EXPD)
(define CPT_SMALL_NUMBER_START 35)
(define CPT_SMALL_NUMBER_START 36)
(define CPT_SMALL_NUMBER_END 60)
(define CPT_SMALL_SYMBOL_START 60)
@ -715,8 +716,12 @@
(cons (or name null)
lams)
out)]
[(struct let-one (rhs body flonum?))
(out-byte (if flonum? CPT_LET_ONE_FLONUM CPT_LET_ONE) out)
[(struct let-one (rhs body flonum? unused?))
(out-byte (cond
[flonum? CPT_LET_ONE_FLONUM]
[unused? CPT_LET_ONE_UNUSED]
[else CPT_LET_ONE])
out)
(out-expr (protect-quote rhs) out)
(out-expr (protect-quote body) out)]
[(struct let-void (count boxes? body))

8
collects/compiler/zo-parse.ss
View File

@ -412,7 +412,8 @@
[32 closure]
[33 delayed]
[34 prefab]
[35 60 small-number]
[35 let-one-unused]
[36 60 small-number]
[60 80 small-symbol]
[80 92 small-marshalled]
[92 ,(+ 92 small-list-max) small-proper-list]
@ -766,9 +767,10 @@
(if ppr null (read-compact cp)))
(read-compact-list l ppr cp))
(loop l ppr)))]
[(let-one let-one-flonum)
[(let-one let-one-flonum let-one-unused)
(make-let-one (read-compact cp) (read-compact cp)
(eq? cpt-tag 'let-one-flonum))]
(eq? cpt-tag 'let-one-flonum)
(eq? cpt-tag 'let-one-unused))]
[(branch)
(make-branch (read-compact cp) (read-compact cp) (read-compact cp))]
[(module-index) (module-path-index-join (read-compact cp) (read-compact cp))]

2
collects/compiler/zo-structs.ss
View File

@ -118,7 +118,7 @@
(define-form-struct (closure expr) ([code lam?] [gen-id symbol?])) ; a static closure (nothing to close over)
(define-form-struct (case-lam expr) ([name (or/c symbol? vector? empty?)] [clauses (listof (or/c lam? indirect?))])) ; each clause is a lam (added indirect)
(define-form-struct (let-one expr) ([rhs (or/c expr? seq? indirect? any/c)] [body (or/c expr? seq? indirect? any/c)] [flonum? boolean?])) ; pushes one value onto stack
(define-form-struct (let-one expr) ([rhs (or/c expr? seq? indirect? any/c)] [body (or/c expr? seq? indirect? any/c)] [flonum? boolean?] [unused? boolean?])) ; pushes one value onto stack
(define-form-struct (let-void expr) ([count exact-nonnegative-integer?] [boxes? boolean?] [body (or/c expr? seq? indirect? any/c)])) ; create new stack slots
(define-form-struct (install-value expr) ([count exact-nonnegative-integer?]
[pos exact-nonnegative-integer?]