Skip to content

jb / fold literal unbox #113

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
jackbackrack wants to merge 2 commits into
base: master
Choose a base branch
from
Open

jb / fold literal unbox #113

Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
52b1ac4
fold literal unbox
jackbackrack Sep 15, 2021
1c8e321
merge master
jackbackrack Sep 24, 2021
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
42 changes: 28 additions & 14 deletions compiler/stz-el.stanza
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -2399,14 +2399,22 @@ defn box-unbox-fold (epackage:EPackage, gvt:VarTable) -> EPackage :

;Compute binding table.
;Every entry in the binding table, x => e, indicates that
;x is defined exactly once by the EObject or ENewObject instruction.
defn binding-table (e:EBody) -> IntTable<EObject|ENewObject> :
val table = IntListTable<EObject|ENewObject>()
;x is defined exactly once by the
;EObject, ENewObject, or EDef instruction.
defn binding-table (e:EBody) -> IntTable<ELItem> :
val table = IntListTable<ELItem>()
val remove-set = IntSet()
defn remove-varloc-vars (i:EIns) :
do(add{remove-set, n(_)}, varlocs(i))
for i in ins(e) do :
match(i:EObject|ENewObject) : add(table, n(x(i)), i)
else : do(add{remove-set, n(_)}, varlocs(i))
to-inttable<EObject|ENewObject> $
match(i) :
(i:EObject|ENewObject) : add(table, n(x(i)), i)
(i:EDef) :
match(x(i), y(i)) :
(x:EVarLoc, y:ELiteral) : add(table, n(x), y)
(x, y) : remove-varloc-vars(i)
(i) : remove-varloc-vars(i)
to-inttable<ELItem> $
for entry in table seq? :
if remove-set[key(entry)] : None()
else if length(value(entry)) == 1 : One(key(entry) => head(value(entry)))
Expand All @@ -2423,26 +2431,32 @@ defn box-unbox-fold (epackage:EPackage, gvt:VarTable) -> EPackage :
;field. Calls fail() if not a match.
defn unbox-object-get (e:EObjectGet,
vt:VarTable,
bindings:IntTable<EObject|ENewObject>) -> [EVarLoc, EImm] :
bindings:IntTable<ELItem>) -> [EVarLoc, EImm] :
val v = y(e) as? EVar
val o = get?(bindings, n(v)) as? ENewObject
val value = ys(o)[index(e)]
fail() when not immutable?(vt,value)
[x(e), value]

;If the given ELoad expression corresponds to a retrieval
;of a known object field then return the destination and the field.
;of a known object field or literal value then
;return the destination and the field or value.
;Calls fail() if not a match.
defn unbox-load (e:ELoad,
vt:VarTable,
bindings:IntTable<EObject|ENewObject>, ) -> [EVarLoc, EImm] :
bindings:IntTable<ELItem>, ) -> [EVarLoc, EImm] :
val field = loc(e) as? EField
val v = y(loc(field) as? EDeref) as? EVar
val o = get?(bindings, n(v)) as? EObject
fail() when mutable-field?(defstruct-table, n(o), index(field))
val value = ys(o)[index(field)]
fail() when not immutable?(vt,value)
[x(e), value]
match(get?(bindings, n(v))) :
(o:EObject) :
fail() when mutable-field?(defstruct-table, n(o), index(field))
val value = ys(o)[index(field)]
fail() when not immutable?(vt,value)
[x(e), value]
(o:ELiteral) :
fail() when (index(field) != 0 or value(o) is-not Byte|Int|Long|Float|Double)
[x(e), ELSLiteral(value(o))]
(o) : fail()

;Perform unboxing folds in the given body.
;Assumes that all nested bodies have already been folded.
Expand Down