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Separation checking for product types#22539

Merged

odersky merged 93 commits intoscala:mainscala/scala3:mainfrom

dotty-staging:sepchecks-data-handlingdotty-staging/dotty:sepchecks-data-handlingCopy head branch name to clipboard

Mar 14, 2025

Conversation Commits93 (93)Checks Files changed

Commits

Commits on Mar 14, 2025

Elide capabilities implied by Capability subtypes when printing
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Add Mutable classes and ReadOnly capabilities
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Drop special handling of functions with pure arguments in Existential.toCap
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Implement fresh capabilities
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Separation checking for applications
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Separation checking for blocks
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Address review comments
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Use deep capturesets for separation checking.
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Cache derived reach, readOnly, and maybe capabilities
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Avoid forming intersections of capture sets on refined type lookup
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Check separation of different parts of a declared type.
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Check that hidden parameters are annotated @consume
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Check that only @consume parameters flow to @consume parameters
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Check that SharedCapabilities don't capture `cap`.
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Turn separation checking on by default
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Make sure fresh results of methods only hide local refs
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Make sure parameters are not used again after they are consumed
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Check accesses to non-local this in hidden sets
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Check that @consumed prefix capabilities are not re-used
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Allow SharableCapablity anywhere on a path
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Polishings
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Polish and document separation checker.
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Address review comments
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Fix handling paths extending SharedCapabiolity
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Streamline deepCaptureSet
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Avoid edge case where non-sensical info was printed for selections
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Make printFresh a -Y option
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Charge deep capture set for arguments to @consume parameters
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Don't flag local fresh capabilities as errors in markFree
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Tweak error message in SepCheck
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Add reach capabilities on the fly in getBoxed
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Revise path handling
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Don't avoid elements of hidden sets
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Shorten transitive hidden sets and replace cycles by aliases
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Use peaks-based checking for applications
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Allow more than one existential per binder.
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Use peaks-based checking for types
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Drop transitive hidden set construction
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Peak-based separation checking for def-use
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More tests
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Fix: Don't add implicit Capability captures to result types of constructors
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Dont apply Fresh.FromCap to inferred types
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Also include nested caps when computing hidden members of a capture set
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Fix soundness problem with curried functions
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Use Fresh(...) instead of Fresh.Cap(...)
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Print cc-generated dependent functions as parametric functions
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Fix resultDependent computation for MethodTypes
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Adopt declared parameter names in comparison
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Make mapping to dependent functions more uniform
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Refactoring: Move normalizeCaptures to SetupTypeMap
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Fix: Avoid double refinements
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Simplify Existential.mapCapInResults
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Some infrastructure for making existentials Fresh instances
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Switch to new scheme for bound caps
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Improve printing of existential Fresh instances
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Improve printing of Fresh in parts of types
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Drop old existential handling
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Drop deep toCap when checking closures
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Drop followResult = true in CaptureSet.ofInfo
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Make `inOpenedFreshBinder` work also if there is no capture checking phase
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Update check files
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Refactoring: Separate addOwnerAsHidden from Fresh creation
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Expand cap arguments of function aliases before de-aliasing
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Always use the sealed policy
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Refactoring: Move Fresh.fromCap into transformExplicitType
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Open existential scopes only for `(x: T) => U` functions
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Tighten subsume rules for existentials
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Tighten existential subsume rules further:
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chore: double the heap size and the stack size

hamzaremmal
authored and
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Allow whitespace between -> and following capture set
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Make CanThrow a SharedCapability
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Let existential variables only subsume shared capabilities
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Classify existential variables as root capabilities
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Classify existential variables as root capabilities
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Merge `Existential` and `Fresh` into `root` module
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Drop Caps_Exists handling and deprecate caps.Exists
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Small tweaks
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Make `cap` not subsume anything by default.
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Turn off withCapAsRoot exception for box adaptation
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Test case showing that second soundness hole is filled
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Tighten consume checks
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Split posCC from pos tests
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Fine-tune pruning for consume checks of arguments
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Refactor
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Fix compute overlap logic for consumes
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Remove unused files and document root.scala
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Add `mut` modifier to Parser doc comment
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Rename -Ycc-print-fresh to -Ycc-verbose
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Refactor addenda generation
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More refactoring, avoid globally accessible variable
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Fix typo in error message
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Change rules for tracked refinments and tighten intersections
odersky
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Fix MimaFilters
odersky
committed

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