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cycle breaker (#13593)

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* cycle breaking as an alternative to cycle detection
This commit is contained in:
Andreas Rumpf 2020-03-19 22:58:16 +01:00 • committed by GitHub
commit 35fb38629f
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10 changed files with 298 additions and 41 deletions
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18
lib/system/cyclicrefs_v2.nim
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@ -43,6 +43,7 @@ proc markCyclic*[T](x: ref T) {.inline.} =
## Experimental API. Do not use!
let h = head(cast[pointer](x))
h.setColor colYellow
type
CellTuple = (Cell, PNimType)
CellArray = ptr UncheckedArray[CellTuple]
@ -153,18 +154,19 @@ proc scanGreen(s: Cell; desc: PNimType; j: var GcEnv) =
when traceCollector:
cprintf("[Cycle inc] %p %ld color %ld\n", t, t.rc shr rcShift, t.color)
proc nimTraceRef(p: pointer; desc: PNimType; env: pointer) {.compilerRtl.} =
if p != nil:
var t = head(p)
proc nimTraceRef(q: pointer; desc: PNimType; env: pointer) {.compilerRtl.} =
let p = cast[ptr pointer](q)
if p[] != nil:
var j = cast[ptr GcEnv](env)
var t = head(p[])
j.traceStack.add(t, desc)
proc nimTraceRefDyn(p: pointer; env: pointer) {.compilerRtl.} =
if p != nil:
let desc = cast[ptr PNimType](p)[]
var t = head(p)
proc nimTraceRefDyn(q: pointer; env: pointer) {.compilerRtl.} =
let p = cast[ptr pointer](q)
if p[] != nil:
var j = cast[ptr GcEnv](env)
j.traceStack.add(t, desc)
var t = head(p[])
j.traceStack.add(t, cast[ptr PNimType](p[])[])
proc scan(s: Cell; desc: PNimType; j: var GcEnv) =
when traceCollector: