An optimizer for ARC (#14962)

* 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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@ -21,11 +21,13 @@ proc `=sink`(dest: var Foo, src: Foo) =
proc `=`(dest: var Foo, src: Foo) =
assign_counter.inc
proc createFoo(): Foo = Foo(boo: 0)
proc test(): auto =
var a, b: Foo
var a, b = createFoo()
return (a, b, Foo(boo: 5))
var (a, b, _) = test()
var (ag, bg, _) = test()
doAssert assign_counter == 0
doAssert sink_counter == 0