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Carp/test/TestConstraints.hs
Scott Olsen e1943b29a9
Refactor: clean up Env module, store type environments in modules (#1207) 
* refactor: major environment mgmt refactor

This big refactor primarily changes two things in terms of behavior:

1. Stores a SymPath on concretely named (non-generic) struct types;
   before we stored a string.
2. The SymPath mentioned in (1.) designates where the struct is stored
   in the current environment chain. Modules now carry a local type
   environment in addition to their local value environments. Any types
   defined in the module are added to this environment rather than the
   global type environment.

To resolve a type such as `Foo.Bar` we now do the following:

- Search the *global value environment* for the Foo module.
- Get the type environment stored in the Foo module.
- Search for Bar in the Foo module's type environment.

Additionally, this commit eliminates the Lookup module entirely and
refactors the Env module to handle all aspects of environment management
in hopefully a more reusable fashion.

I also took the opportunity to refactor primitiveDeftype in Primitives
and qualifySym in Qualify, both of which were hefty functions that I
found difficult to grok and needed refactoring anyway as a result of
lookup changes (lookups now return an Either instead of a Maybe).

Subsequent commits will clean up and clarify this work further.

This does include one minor regression. Namely, an implementation of
`hash` in core/Color that was maximally generic now needs type casting.

* refactor: clean up recent Env changes

This commit removes some redundant functions, unifies some logic, and
renames some routines across the Env module in efforts to make it
cleaner. Call sites have been updated accordingly.

* chore: format code with ormolu

* fix: update lookup tests

Changes references to renamed functions in the Env module.

* refactor: style + additional improvements from eriksvedang@

- Rename arrayTy -> arrayTyA in ArrayTemplates.hs to disambiguate.
- Add maybeId util function.
- Remove commented code.
- Refactor a few functions for readability.

* fix: fix type inference regression

Recent commits introduced one minor regression whereby an instance of
type inference in core/Color.carp no longer worked and required
explicit type annotation. The problem ultimately had to do with
qualification:

- Prior to the recent changes, type inference worked because the call in
  question was qualified to Color.Id.get-tag, fixing the type.
- Failing to copy over a local envs Use modules to function envs
  resulted in finding more than just Color.Id.get-tag for this instance.

We now copy use modules over to function envs generated during
qualification to ensure we resolve to Use'd definitions before more
general cases.

Similarly, I made a small change to primitiveUse to support contextual
use calls (e.g. the `(use Id)` in Color.carp, which really means `(use
Color.Id)`)

* chore: Update some clarificatory comments

* chore: fix inline comment
2021-05-19 19:20:48 +02:00

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module TestConstraints where
import Constraints
import Eval
import Infer
import qualified Map
import Obj
import Parsing
import qualified Set
import Test.HUnit
import TestLookup
import Types
-- | Helper functions for testing unification of Constraints
isUnificationFailure :: Either UnificationFailure TypeMappings -> Bool
isUnificationFailure (Left _) = True
isUnificationFailure (Right _) = False
assertUnificationFailure :: [Constraint] -> Test
assertUnificationFailure constraints =
TestCase $
assertBool "Failure" (isUnificationFailure (solve constraints))
assertSolution :: [Constraint] -> [(String, Ty)] -> Test
assertSolution constraints solution =
TestCase $
assertEqual "Solution" (Right (Map.fromList solution)) (solve constraints)
-- | A dummy XObj
x = XObj (External Nothing) Nothing Nothing
-- | Some type variables
t0 = VarTy "t0"
t1 = VarTy "t1"
t2 = VarTy "t2"
t3 = VarTy "t3"
-- | Test constraints
testConstraints =
[ testConstr1,
testConstr2,
testConstr3,
testConstr4,
testConstr5,
testConstr6,
testConstr7,
testConstr8,
testConstr9,
testConstr10,
testConstr11,
testConstr12,
testConstr13,
testConstr20,
testConstr21,
testConstr22,
testConstr23,
testConstr24,
-- ,testConstr30 DISABLED FOR NOW, started failing when lifetimes were added to function types TODO: Fix!
testConstr31,
testConstr32,
testConstr33,
testConstr34,
testConstr35
]
testConstr1 =
assertUnificationFailure
[Constraint FloatTy IntTy x x x OrdNo]
testConstr2 =
assertSolution
[Constraint IntTy t0 x x x OrdNo]
[("t0", IntTy)]
testConstr3 =
assertSolution
[Constraint t0 IntTy x x x OrdNo]
[("t0", IntTy)]
testConstr4 =
assertSolution
[Constraint t0 t1 x x x OrdNo, Constraint t0 IntTy x x x OrdNo]
[("t0", IntTy), ("t1", IntTy)]
testConstr5 =
assertSolution
[Constraint t0 t1 x x x OrdNo, Constraint t1 IntTy x x x OrdNo]
[("t0", IntTy), ("t1", IntTy)]
testConstr6 =
assertSolution
[Constraint t0 t1 x x x OrdNo, Constraint t1 t3 x x x OrdNo, Constraint t2 IntTy x x x OrdNo, Constraint t3 IntTy x x x OrdNo]
[("t0", IntTy), ("t1", IntTy), ("t2", IntTy), ("t3", IntTy)]
testConstr7 =
assertUnificationFailure
[Constraint t0 IntTy x x x OrdNo, Constraint t0 FloatTy x x x OrdNo]
testConstr8 =
assertSolution
[Constraint t0 IntTy x x x OrdNo, Constraint t0 t0 x x x OrdNo]
[("t0", IntTy)]
testConstr9 =
assertSolution
[Constraint t0 IntTy x x x OrdNo, Constraint t0 t1 x x x OrdNo]
[("t0", IntTy), ("t1", IntTy)]
testConstr10 =
assertSolution
[Constraint (PointerTy (VarTy "a")) (PointerTy (VarTy "b")) x x x OrdNo]
[("a", (VarTy "a")), ("b", (VarTy "a"))]
testConstr11 =
assertSolution
[Constraint (PointerTy (VarTy "a")) (PointerTy (StructTy (ConcreteNameTy (SymPath [] "Monkey")) [])) x x x OrdNo]
[("a", (StructTy (ConcreteNameTy (SymPath [] "Monkey")) []))]
testConstr12 =
assertSolution
[ Constraint t1 (PointerTy (StructTy (ConcreteNameTy (SymPath [] "Array")) [IntTy])) x x x OrdNo,
Constraint t1 (PointerTy t2) x x x OrdNo
]
[ ("t1", (PointerTy (StructTy (ConcreteNameTy (SymPath [] "Array")) [IntTy]))),
("t2", (StructTy (ConcreteNameTy (SymPath [] "Array")) [IntTy]))
]
testConstr13 =
assertSolution
[ Constraint t1 CharTy x x x OrdNo,
Constraint t1 CharTy x x x OrdNo
]
[("t1", CharTy)]
-- -- Should collapse type variables into minimal set:
-- testConstr10 = assertSolution
-- [Constraint t0 t1 x x x, Constraint t1 t2 x x x, Constraint t2 t3 x x x OrdNo]
-- [("t0", VarTy "t0"), ("t1", VarTy "t0"), ("t2", VarTy "t0")]
-- m7 = solve ([Constraint t1 t2 x x x, Constraint t0 t1 x x x OrdNo])
-- Struct types
testConstr20 =
assertSolution
[ Constraint t0 (StructTy (ConcreteNameTy (SymPath [] "Vector")) [t1]) x x x OrdNo,
Constraint t0 (StructTy (ConcreteNameTy (SymPath [] "Vector")) [IntTy]) x x x OrdNo
]
[("t0", (StructTy (ConcreteNameTy (SymPath [] "Vector")) [IntTy])), ("t1", IntTy)]
testConstr21 =
assertSolution
[ Constraint t1 (StructTy (ConcreteNameTy (SymPath [] "Array")) [t2]) x x x OrdNo,
Constraint t1 (StructTy (ConcreteNameTy (SymPath [] "Array")) [t3]) x x x OrdNo,
Constraint t3 BoolTy x x x OrdNo
]
[ ("t1", (StructTy (ConcreteNameTy (SymPath [] "Array")) [BoolTy])),
("t2", BoolTy),
("t3", BoolTy)
]
testConstr22 =
assertSolution
[ Constraint t1 (StructTy (ConcreteNameTy (SymPath [] "Array")) [t2]) x x x OrdNo,
Constraint t2 (StructTy (ConcreteNameTy (SymPath [] "Array")) [t3]) x x x OrdNo,
Constraint t3 FloatTy x x x OrdNo
]
[ ("t1", (StructTy (ConcreteNameTy (SymPath [] "Array")) [(StructTy (ConcreteNameTy (SymPath [] "Array")) [FloatTy])])),
("t2", (StructTy (ConcreteNameTy (SymPath [] "Array")) [FloatTy])),
("t3", FloatTy)
]
testConstr23 =
assertUnificationFailure
[ Constraint (StructTy (ConcreteNameTy (SymPath [] "Array")) [t1]) (StructTy (ConcreteNameTy (SymPath [] "Array")) [t2]) x x x OrdNo,
Constraint t1 IntTy x x x OrdNo,
Constraint t2 FloatTy x x x OrdNo
]
testConstr24 =
assertUnificationFailure
[ Constraint t2 FloatTy x x x OrdNo,
Constraint t1 IntTy x x x OrdNo,
Constraint (StructTy (ConcreteNameTy (SymPath [] "Array")) [t1]) (StructTy (ConcreteNameTy (SymPath [] "Array")) [t2]) x x x OrdNo
]
-- m9 = solve [Constraint (StructTy "Vector" [IntTy]) (StructTy "Vector" [t1]) x x x OrdNo]
-- m10 = solve [Constraint (StructTy "Vector" [t1]) (StructTy "Vector" [t2]) x x x OrdNo]
-- Func types
testConstr30 =
assertSolution
[ Constraint t2 (FuncTy [t0] t1 StaticLifetimeTy) x x x OrdNo,
Constraint t2 (FuncTy [IntTy] BoolTy StaticLifetimeTy) x x x OrdNo
]
[("t0", IntTy), ("t1", BoolTy), ("t2", (FuncTy [IntTy] BoolTy StaticLifetimeTy))]
testConstr31 =
assertSolution
[Constraint (FuncTy [t0] t1 StaticLifetimeTy) (FuncTy [IntTy] BoolTy StaticLifetimeTy) x x x OrdNo]
[("t0", IntTy), ("t1", BoolTy)]
testConstr32 =
assertSolution
[Constraint t0 (FuncTy [IntTy] BoolTy StaticLifetimeTy) x x x OrdNo]
[("t0", (FuncTy [IntTy] BoolTy StaticLifetimeTy))]
testConstr33 =
assertSolution
[ Constraint t1 (FuncTy [t2] IntTy StaticLifetimeTy) x x x OrdNo,
Constraint t1 (FuncTy [t3] IntTy StaticLifetimeTy) x x x OrdNo,
Constraint t3 BoolTy x x x OrdNo
]
[ ("t1", (FuncTy [BoolTy] IntTy StaticLifetimeTy)),
("t2", BoolTy),
("t3", BoolTy)
]
testConstr34 =
assertSolution
[ Constraint (VarTy "a") (StructTy (ConcreteNameTy (SymPath [] "Pair")) [(VarTy "x0"), (VarTy "y0")]) x x x OrdNo,
Constraint (StructTy (ConcreteNameTy (SymPath [] "Array")) [(VarTy "a")]) (StructTy (ConcreteNameTy (SymPath [] "Array")) [(StructTy (ConcreteNameTy (SymPath [] "Pair")) [(VarTy "x1"), (VarTy "y1")])]) x x x OrdNo
]
[ ("a", (StructTy (ConcreteNameTy (SymPath [] "Pair")) [(VarTy "x0"), (VarTy "y0")])),
("x0", (VarTy "x0")),
("y0", (VarTy "y0")),
("x1", (VarTy "x0")),
("y1", (VarTy "y0"))
]
-- Same as testConstr34, except everything is wrapped in refs
testConstr35 =
assertSolution
[ Constraint (RefTy (VarTy "a") (VarTy "lt0")) (RefTy (StructTy (ConcreteNameTy (SymPath [] "Pair")) [(VarTy "x0"), (VarTy "y0")]) (VarTy "lt1")) x x x OrdNo,
Constraint (RefTy (StructTy (ConcreteNameTy (SymPath [] "Array")) [(VarTy "a")]) (VarTy "lt2")) (RefTy (StructTy (ConcreteNameTy (SymPath [] "Array")) [(StructTy (ConcreteNameTy (SymPath [] "Pair")) [(VarTy "x1"), (VarTy "y1")])]) (VarTy "lt3")) x x x OrdNo
]
[ ("a", (StructTy (ConcreteNameTy (SymPath [] "Pair")) [(VarTy "x0"), (VarTy "y0")])),
("x0", (VarTy "x0")),
("y0", (VarTy "y0")),
("x1", (VarTy "x0")),
("y1", (VarTy "y0")),
("lt0", (VarTy "lt0")),
("lt1", (VarTy "lt0")),
("lt2", (VarTy "lt2")),
("lt3", (VarTy "lt2"))
]
-- Ref types with lifetimes
-- testConstr36 = assertSolution
-- [Constraint (RefTy (VarTy "a")) (RefTy (StructTy "Pair" [(VarTy "x0"), (VarTy "y0")])) x x x OrdNo
-- ,Constraint (RefTy (StructTy "Array" [(VarTy "a")])) (RefTy (StructTy "Array" [(StructTy "Pair" [(VarTy "x1"), (VarTy "y1")])])) x x x OrdNo]
-- [("a", (StructTy "Pair" [(VarTy "x0"), (VarTy "y0")]))
-- ,("x0", (VarTy "x0"))
-- ,("y0", (VarTy "y0"))
-- ,("x1", (VarTy "x0"))
-- ,("y1", (VarTy "y0"))
-- ]
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