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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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10
lib/impure/nre.nim
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@ -498,7 +498,7 @@ proc re*(pattern: string): Regex =
initRegex(pattern, flags, study)
proc matchImpl(str: string, pattern: Regex, start, endpos: int, flags: int): Option[RegexMatch] =
var myResult = RegexMatch(pattern : pattern, str : str)
var myResult = RegexMatch(pattern: pattern, str: str)
# See PCRE man pages.
# 2x capture count to make room for start-end pairs
# 1x capture count as slack space for PCRE
@ -528,13 +528,13 @@ proc matchImpl(str: string, pattern: Regex, start, endpos: int, flags: int): Opt
of pcre.ERROR_NULL:
raise newException(AccessViolationDefect, "Expected non-null parameters")
of pcre.ERROR_BADOPTION:
raise RegexInternalError(msg : "Unknown pattern flag. Either a bug or " &
raise RegexInternalError(msg: "Unknown pattern flag. Either a bug or " &
"outdated PCRE.")
of pcre.ERROR_BADUTF8, pcre.ERROR_SHORTUTF8, pcre.ERROR_BADUTF8_OFFSET:
raise InvalidUnicodeError(msg : "Invalid unicode byte sequence",
pos : myResult.pcreMatchBounds[0].a)
raise InvalidUnicodeError(msg: "Invalid unicode byte sequence",
pos: myResult.pcreMatchBounds[0].a)
else:
raise RegexInternalError(msg : "Unknown internal error: " & $execRet)
raise RegexInternalError(msg: "Unknown internal error: " & $execRet)
proc match*(str: string, pattern: Regex, start = 0, endpos = int.high): Option[RegexMatch] =
## Like ` ``find(...)`` <#proc-find>`_, but anchored to the start of the