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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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9
lib/system/refs_v2.nim
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@ -70,7 +70,7 @@ proc nimNewObj(size: int): pointer {.compilerRtl.} =
else:
result = alloc0(s) +! sizeof(RefHeader)
when traceCollector:
cprintf("[Allocated] %p\n", result -! sizeof(RefHeader))
cprintf("[Allocated] %p result: %p\n", result -! sizeof(RefHeader), result)
proc nimNewObjUninit(size: int): pointer {.compilerRtl.} =
# Same as 'newNewObj' but do not initialize the memory to zero.
@ -87,7 +87,7 @@ proc nimNewObjUninit(size: int): pointer {.compilerRtl.} =
orig.rc = 0
result = orig +! sizeof(RefHeader)
when traceCollector:
cprintf("[Allocated] %p\n", result -! sizeof(RefHeader))
cprintf("[Allocated] %p result: %p\n", result -! sizeof(RefHeader), result)
proc nimDecWeakRef(p: pointer) {.compilerRtl, inl.} =
dec head(p).rc, rcIncrement
@ -128,7 +128,10 @@ proc nimDestroyAndDispose(p: pointer) {.compilerRtl, raises: [].} =
nimRawDispose(p)
when defined(gcOrc):
include cyclicrefs_v2
when defined(nimThinout):
include cyclebreaker
else:
include cyclicrefs_v2
proc nimDecRefIsLast(p: pointer): bool {.compilerRtl, inl.} =
if p != nil: