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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
This commit is contained in:
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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6
compiler/injectdestructors.nim
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@ -218,7 +218,7 @@ proc genCopyNoCheck(c: Con; dest, ri: PNode): PNode =
proc genCopy(c: var Con; dest, ri: PNode): PNode =
let t = dest.typ
if tfHasOwned in t.flags:
if tfHasOwned in t.flags and ri.kind != nkNilLit:
# try to improve the error message here:
if c.otherRead == nil: discard isLastRead(ri, c)
checkForErrorPragma(c, t, ri, "=")
@ -409,7 +409,7 @@ proc isCursor(n: PNode): bool =
result = false
proc cycleCheck(n: PNode; c: var Con) =
if c.graph.config.selectedGC != gcDestructors: return
if c.graph.config.selectedGC != gcArc: return
var value = n[1]
if value.kind == nkClosure:
value = value[1]
@ -512,7 +512,7 @@ proc p(n: PNode; c: var Con; mode: ProcessMode): PNode =
result[i] = p(n[i], c, normal)
if n[0].kind == nkSym and n[0].sym.magic in {mNew, mNewFinalize}:
result[0] = copyTree(n[0])
if c.graph.config.selectedGC in {gcHooks, gcDestructors}:
if c.graph.config.selectedGC in {gcHooks, gcArc, gcOrc}:
let destroyOld = genDestroy(c, result[1])
result = newTree(nkStmtList, destroyOld, result)
else: