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new move analyser2 (#20471)

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* produce better code for closure environment creation
* new 'first write' analysis; 
* scope based move analyser
* code cleanup

Co-authored-by: ringabout <43030857+ringabout@users.noreply.github.com>
This commit is contained in:
Andreas Rumpf 2022-10-01 16:46:51 +02:00 • committed by GitHub
commit 8d47bf1822
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19 changed files with 472 additions and 684 deletions
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4
compiler/parampatterns.nim
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@ -183,7 +183,7 @@ type
arLentValue, # lent value
arStrange # it is a strange beast like 'typedesc[var T]'
proc exprRoot*(n: PNode): PSym =
proc exprRoot*(n: PNode; allowCalls = true): PSym =
var it = n
while true:
case it.kind
@ -204,7 +204,7 @@ proc exprRoot*(n: PNode): PSym =
if it.len > 0 and it.typ != nil: it = it.lastSon
else: break
of nkCallKinds:
if it.typ != nil and it.typ.kind in {tyVar, tyLent} and it.len > 1:
if allowCalls and it.typ != nil and it.typ.kind in {tyVar, tyLent} and it.len > 1:
# See RFC #7373, calls returning 'var T' are assumed to
# return a view into the first argument (if there is one):
it = it[1]