Introduce explicit origin flags on ConstructorElement and its fragment
(isOriginDeclaration, isOriginImplicitDefault, isOriginMixinApplication)
and deprecate isSynthetic in favor of these. Define isSynthetic as the
inverse of isOriginDeclaration to preserve the legacy meaning while
encouraging clients to use the more precise origin predicates.
Eventually `Element.isSynthetic` also will be deprecated and removed.
This CL is a step toward this goal, migrating what is possible with new
flags.
Update analyzer internals to rely on the new origin flags when checking
for non-factory generative constructors, building synthetic constructors
for mixin applications, and walking constructor chains in index/search
logic. Only constructors with an origin declaration are now treated as
declarations, and nonSynthetic is defined in terms of origin
declarations rather than synthetic-ness. Add corresponding origin
descriptors to the manifest enum and bump AnalysisDriver.DATA_VERSION.
Adjust analysis server refactorings and fixes to distinguish implicit
default constructors from other synthetic constructors. Code paths that
previously checked isSynthetic for default constructors now check
isOriginImplicitDefault, and mixin-application traversal uses
isOriginMixinApplication.
Overall, this change removes the overloaded semantics of isSynthetic,
makes constructor provenance explicit, and prepares the element model
for future DeCo and primary-constructor scenarios without relying on
brittle synthetic heuristics.
Change-Id: I8568bdfe478867af313a4d13afe1f2859394831b
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/465201
Reviewed-by: Paul Berry <paulberry@google.com>
Reviewed-by: Phil Quitslund <pquitslund@google.com>
Commit-Queue: Konstantin Shcheglov <scheglov@google.com>
Reviewed-by: Samuel Rawlins <srawlins@google.com>
Konstantin Shcheglov
fb0d56b81b