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Cell

pub struct Cell[A] {
  state : State[A]
}

A value that inference may narrow, shared with everything unified with it.

The field is deliberately not part of the interface: make, get, merge and set are, and the union-find underneath is nobody else's business.

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Cell::get

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fn[A] Cell::get(self : Cell[A]) -> A

The value of this cell's class.

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Cell::make

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fn[A] Cell::make(value : A) -> Cell[A]

A fresh cell of its own class.

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Cell::merge

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fn[A] Cell::merge(self : Cell[A], other : Cell[A], value : A) -> Unit

Unify two cells and give the shared class value.

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Cell::set

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fn[A] Cell::set(self : Cell[A], value : A) -> Unit

Overwrite the value at this cell's root.

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Collecting

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pub(all) struct Collecting {
  collected : Array[(@marianoguerra/wax/basic.Location
Location?, Cell[InferredType])]
  exacts : Array[(@marianoguerra/wax/basic.Location
Location?, Cell[InferredType])]
  declared : Cell[InferredType]?
  needed : Bool
  empty_exits : Array[@marianoguerra/wax/basic.Location
Location]
}

A block result under inference.

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InferredType

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pub(all) enum InferredType {
  Unknown
  Error
  UnknownRef
  Null
  Number
  Int8
  Int16
  Int
  LargeInt
  Float
  Valtype(InferredValType)
  Collecting(Collecting)
}

What inference knows about a value.

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InferredValType

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pub(all) struct InferredValType {
  typ : @marianoguerra/wax/wasm/types.ValType
ValType[@marianoguerra/wax/ast.Ident
Ident]
  internal : @marianoguerra/wax/wasm/types.ValType
ValType[@marianoguerra/wax/check/store.Id
Id]
  anon_comptype : @marianoguerra/wax/ast.CompType
CompType?
} derive(Eq)

A fully resolved value type, in both the forms the checker needs.

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State

source

type State[A]

A cell's link to its class, or the class's value at the root.

pub(all) only because MoonBit will not let a public struct hold a private type; nothing outside builds one.

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f32_cell

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let f32_cell : Cell[InferredType]

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f32_valtype

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let f32_valtype : InferredValType

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f64_cell

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let f64_cell : Cell[InferredType]

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f64_valtype

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let f64_valtype : InferredValType

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i32_cell

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let i32_cell : Cell[InferredType]

Shared cells for the base types.

Safe to share for the same reason the valtypes are: their value never changes, so no unification can be observed through one.

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i32_valtype

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let i32_valtype : InferredValType

A resolved numeric type, in both forms.

A concrete base type is never re-resolved during inference -- only a floating cell is unified into one -- so these are invariant and shared.

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i64_cell

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let i64_cell : Cell[InferredType]

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i64_valtype

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let i64_valtype : InferredValType

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is_unknown_or_error

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fn is_unknown_or_error(cell : Cell[InferredType]) -> Bool

Is this "no concrete type known"?

Unknown, Error and UnknownRef differ in what they license -- see the constructors -- but the many places that only need to ask whether a type is known share this.

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same_cell

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fn[A] same_cell(a : Cell[A], b : Cell[A]) -> Bool

Are these the same cell, rather than two cells that merely hold equal values?

Identity matters wherever a cell is used as a TOKEN rather than as a type: the underflow placeholders are looked up this way, because two missing values both recorded as Error are still two different missing values.

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to_string

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fn to_string(cell : Cell[InferredType]) -> String

Render an inferred type as plain text.

For a hover string or a debug dump. A diagnostic uses render instead, so that it shares the message's theme.

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valtype_cell

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fn valtype_cell(v : InferredValType) -> Cell[InferredType]

Wrap a resolved value type in a fresh cell.

Source Files

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#Cell

#Cell::get

#Cell::make

#Cell::merge

#Cell::set

#Collecting

#InferredType

#InferredValType

#State

#f32_cell

#f32_valtype

#f64_cell

#f64_valtype

#i32_cell

#i32_valtype

#i64_cell

#i64_valtype

#is_unknown_or_error

#same_cell

#to_string

#valtype_cell

Source Files

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Cell

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Cell::get

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Cell::make

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Cell::merge

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Cell::set

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Collecting

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InferredType

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InferredValType

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State

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f32_cell

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f32_valtype

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f64_cell

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f64_valtype

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i32_cell

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i32_valtype

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i64_cell

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i64_valtype

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is_unknown_or_error

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same_cell

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to_string

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valtype_cell