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ARC: cycle detector (#12823)

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* first implementation of the =trace and =dispose hooks for the cycle collector
* a cycle collector for ARC: progress
* manual: the .acyclic pragma is a thing once again
* gcbench: adaptations for --gc:arc
* enable valgrind tests for the strutils tests
* testament: better valgrind support
* ARC refactoring: growable jumpstacks
* ARC cycle detector: non-recursive algorithm
* moved and renamed core/ files back to system/
* refactoring: --gc:arc vs --gc:orc since 'orc' is even more experimental and we want to ship --gc:arc soonish
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Andreas Rumpf 2019-12-17 17:37:50 +01:00 • committed by GitHub
commit 83a736a34a
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45 changed files with 939 additions and 229 deletions
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compiler/types.nim
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@ -351,7 +351,9 @@ proc canFormAcycleNode(marker: var IntSet, n: PNode, startId: int): bool =
proc canFormAcycleAux(marker: var IntSet, typ: PType, startId: int): bool =
result = false
if typ == nil: return
if tfAcyclic in typ.flags: return
var t = skipTypes(typ, abstractInst+{tyOwned}-{tyTypeDesc})
if tfAcyclic in t.flags: return
case t.kind
of tyTuple, tyObject, tyRef, tySequence, tyArray, tyOpenArray, tyVarargs:
if not containsOrIncl(marker, t.id):