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An optimizer for ARC (#14962)

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* WIP: an optimizer for ARC
* do not optimize away destructors in 'finally' if unstructured control flow is involved
* optimized the optimizer
* minor code cleanup
* first steps to .cursor inference
* cursor inference: big steps to a working solution
* baby steps
* better .cursor inference
* new feature: expandArc for easy inspection of the AST after ARC transformations
* added topt_cursor test
* adapt tests
* cleanups, make tests green
* optimize common traversal patterns
* moved test case
* fixes .cursor inference so that npeg compiles once again
* cursor inference: more bugfixes

Co-authored-by: Clyybber <darkmine956@gmail.com>
This commit is contained in:
Andreas Rumpf 2020-07-15 23:00:06 +02:00 • committed by GitHub
commit c5358b0d4b
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19 changed files with 895 additions and 62 deletions
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compiler/transf.nim
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@ -233,7 +233,7 @@ proc hasContinue(n: PNode): bool =
proc newLabel(c: PTransf, n: PNode): PSym =
result = newSym(skLabel, nil, getCurrOwner(c), n.info)
result.name = getIdent(c.graph.cache, genPrefix & $result.id)
result.name = getIdent(c.graph.cache, genPrefix)
proc transformBlock(c: PTransf, n: PNode): PNode =
var labl: PSym