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ok simplify the refs back

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This commit is contained in:
Mirek Kratochvil 2022-11-15 20:30:53 +01:00
parent 8d5353dc8c
commit e074e454d5
5 changed files with 54 additions and 66 deletions
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24
app/Builtins.hs
View file

@ -10,10 +10,14 @@ import qualified Operators as O
bi = Builtin
hello =
bi $ do
liftIO $ putStrLn "hllo prlg"
return Nothing
hello :: BuiltinFn
hello = do
liftIO $ putStrLn "hllo prlg"
return Nothing
printLocals :: BuiltinFn
printLocals = do
return Nothing
addBuiltins :: PrlgEnv ()
addBuiltins = do
@ -21,28 +25,30 @@ addBuiltins = do
a <- findAtom "a"
b <- findAtom "b"
c <- findAtom "c"
varX <- findAtom "X"
b0 <- findStruct "b" 0
any1 <- findStruct "any" 1
eq2 <- findStruct "=" 2
hello0 <- findStruct "hello" 0
fail0 <- findStruct "fail" 0
true0 <- findStruct "true" 0
prlgstate0 <- findStruct "prlgstate" 0
printlocals0 <- findStruct "print_locals" 0
debugprint0 <- findStruct "interpreter_state" 0
modify $ \s ->
s
{ defs =
M.fromList
[ (eq2, [[U (LocalRef 0 Nothing), U (LocalRef 0 Nothing), NoGoal]])
[ (eq2, [[U (LocalRef 0 varX), U (LocalRef 0 varX), NoGoal]])
, (a1, [[U (Atom a), NoGoal], [U (Atom b), NoGoal]])
, ( b0
, [ [Goal, U (Struct a1), U (Atom c), LastCall]
, [Goal, U (Struct a1), U (Atom b), LastCall]
])
, (any1, [[U (VoidRef Nothing), NoGoal]])
, (hello0, [[Invoke hello]])
, (any1, [[U VoidRef, NoGoal]])
, (hello0, [[Invoke $ bi hello]])
, (fail0, [[Invoke $ bi backtrack]])
, (true0, [[Invoke $ bi (pure Nothing)]])
, ( prlgstate0
, ( debugprint0
, [[Invoke $ bi (get >>= liftIO . print >> pure Nothing)]])
]
, ops = [(O.xfy "," 1000), (O.xfx "=" 700)]

8
app/Code.hs
View file

@ -9,9 +9,9 @@ import System.Console.Haskeline
data Datum
= Atom Int -- unifies a constant
| Struct Id -- unifies a structure with arity
| VoidRef (Maybe Int) -- unifies with anything (references may refer to variable names)
| LocalRef Int (Maybe Int) -- code-local variable idx (should not occur on heap)
| HeapRef Int (Maybe Int) -- heap structure idx
| VoidRef -- unifies with anything
| LocalRef Int Int -- code-local variable idx (should never occur on heap)
| HeapRef Int -- something further on the heap
deriving (Show, Eq, Ord)
data Instr
@ -34,7 +34,7 @@ data Heap =
emptyHeap = Heap 0 M.empty
type Scope = M.Map Int Int
type Scope = M.Map Int (Int, Int)
emptyScope :: Scope
emptyScope = M.empty

6
app/Compiler.hs
View file

@ -32,7 +32,7 @@ variablizePrlg :: Int -> [Int] -> PrlgInt -> PrlgInt
variablizePrlg void vs (CallI id ps) =
CallI id $ map (variablizePrlg void vs) ps
variablizePrlg void vs (LiteralI i)
| i == void = VoidI i
| i == void = VoidI
| Just idx <- elemIndex i vs = VarI idx i
| otherwise = LiteralI i
@ -50,8 +50,8 @@ compileGoal x = compileArg x
compileArg :: PrlgInt -> Code
compileArg (CallI x args) = U (Struct x) : concatMap compileArg args
compileArg (LiteralI x) = [U (Atom x)]
compileArg (VarI x i) = [U (LocalRef x $ Just i)]
compileArg (VoidI i) = [U (VoidRef $ Just i)]
compileArg (VarI x i) = [U (LocalRef x i)]
compileArg (VoidI) = [U VoidRef]
seqGoals :: [Code] -> Code
seqGoals [] = [NoGoal]

2
app/IR.hs
View file

@ -18,7 +18,7 @@ data PrlgInt
= CallI Id [PrlgInt]
| LiteralI Int
| VarI Int Int
| VoidI Int
| VoidI
deriving (Show)
data StrTable =

80
app/Interpreter.hs
View file

@ -69,7 +69,6 @@ proveStep = St.get >>= go
, gol = U g:gs
, heap = heap@(Heap _ hmap)
}} = unify h g
{- termination tools -}
where
uok = c i {cur = cur {hed = hs, gol = gs}}
setHeap r x =
@ -77,7 +76,7 @@ proveStep = St.get >>= go
{- heap tools -}
deref x =
case hmap M.!? x of
Just (HeapRef x' _) ->
Just (HeapRef x') ->
if x == x'
then FreeRef x'
else deref x'
@ -88,71 +87,56 @@ proveStep = St.get >>= go
newHeapVars n (Heap nxt m) =
let addrs = [nxt + i - 1 | i <- [1 .. n]]
in ( Heap (nxt + n) $
foldr (uncurry M.insert) m [(a, HeapRef a Nothing) | a <- addrs]
foldr (uncurry M.insert) m [(a, HeapRef a) | a <- addrs]
, addrs)
allocLocal reg scope cont
| Just addr <- scope M.!? reg = cont scope heap addr
allocLocal (LocalRef reg ident) scope cont
| Just (addr, _) <- scope M.!? reg = cont scope heap addr
| (heap', addr) <- newHeapVar heap =
cont (M.insert reg addr scope) heap' addr
cont (M.insert reg (addr, ident) scope) heap' addr
newHeapStruct addr s@(Struct Id {arity = arity}) cont =
let (Heap nxt' m', addrs) = newHeapVars (arity + 1) heap
m'' =
M.insert addr (HeapRef (head addrs) Nothing) .
M.insert (head addrs) s $
M.insert addr (HeapRef $ head addrs) . M.insert (head addrs) s $
m'
in cont [HeapRef a Nothing | a <- tail addrs] (Heap nxt' m'')
in cont (map HeapRef $ tail addrs) (Heap nxt' m'')
{- simple cases first -}
unify (VoidRef _) (VoidRef _) = uok
unify VoidRef VoidRef = uok
unify (Atom a) (Atom b)
| a == b = uok
unify (VoidRef _) (Atom _) = uok
unify (Atom _) (VoidRef _) = uok
unify VoidRef (Atom _) = uok
unify (Atom _) VoidRef = uok
unify (Struct a) (Struct b)
| a == b = uok
{- unifying a struct with void must cause us to skip the void -}
unify (VoidRef _) (Struct Id {arity = a}) =
c
i
{ cur =
cur {hed = replicate a (U $ VoidRef Nothing) ++ hs, gol = gs}
}
unify (Struct Id {arity = a}) (VoidRef _) =
c
i
{ cur =
cur {hed = hs, gol = replicate a (U $ VoidRef Nothing) ++ gs}
}
unify VoidRef (Struct Id {arity = a}) =
c i {cur = cur {hed = replicate a (U VoidRef) ++ hs, gol = gs}}
unify (Struct Id {arity = a}) VoidRef =
c i {cur = cur {hed = hs, gol = replicate a (U VoidRef) ++ gs}}
{- handle local refs; first ignore their combination with voids to save memory -}
unify (LocalRef _ _) (VoidRef _) = uok
unify (VoidRef _) (LocalRef _ _) = uok
unify (LocalRef _ _) VoidRef = uok
unify VoidRef (LocalRef _ _) = uok
{- allocate heap for LocalRefs and retry with HeapRefs -}
unify (LocalRef hv ident) _ =
allocLocal hv (hvar cur) $ \hvar' heap' addr ->
unify lr@(LocalRef _ _) _ =
allocLocal lr (hvar cur) $ \hvar' heap' addr ->
c
i
{ cur =
cur
{ hed = U (HeapRef addr ident) : hs
, hvar = hvar'
, heap = heap'
}
{hed = U (HeapRef addr) : hs, hvar = hvar', heap = heap'}
}
unify _ (LocalRef gv ident) =
allocLocal gv (gvar cur) $ \gvar' heap' addr ->
unify _ lr@(LocalRef _ _) =
allocLocal lr (gvar cur) $ \gvar' heap' addr ->
c
i
{ cur =
cur
{ gol = U (HeapRef addr ident) : gs
, gvar = gvar'
, heap = heap'
}
{gol = U (HeapRef addr) : gs, gvar = gvar', heap = heap'}
}
{- handle heap refs; first ignore their combination with voids again -}
unify (HeapRef _ _) (VoidRef _) = uok
unify (VoidRef _) (HeapRef _ _) = uok
unify (HeapRef _) VoidRef = uok
unify VoidRef (HeapRef _) = uok
{- actual HeapRefs, these are dereferenced and then unified (sometimes with copying) -}
unify (HeapRef hr' hident) g =
unify (HeapRef hr') g =
case deref hr' of
FreeRef hr ->
case g of
@ -168,10 +152,10 @@ proveStep = St.get >>= go
cur
{hed = map U nhs ++ hs, gol = gs, heap = nheap}
})
HeapRef gr' _ ->
HeapRef gr' ->
case deref gr' of
FreeRef gr -> setHeap hr (HeapRef gr hident)
BoundRef addr _ -> setHeap hr (HeapRef addr hident)
FreeRef gr -> setHeap hr (HeapRef gr)
BoundRef addr _ -> setHeap hr (HeapRef addr)
_ -> ifail "dangling goal ref (from head ref)"
BoundRef _ atom@(Atom a) -> unify atom g
BoundRef addr struct@(Struct Id {arity = arity}) ->
@ -181,13 +165,12 @@ proveStep = St.get >>= go
cur
{ hed =
U struct :
[U (HeapRef (addr + i) Nothing) | i <- [1 .. arity]] ++
hs
[U (HeapRef $ addr + i) | i <- [1 .. arity]] ++ hs
, gol = U g : gs
}
}
_ -> ifail "dangling head ref"
unify h (HeapRef gr' gident) =
unify h (HeapRef gr') =
case deref gr' of
FreeRef gr ->
case h of
@ -212,8 +195,7 @@ proveStep = St.get >>= go
{ hed = U h : hs
, gol =
U struct :
[U (HeapRef (addr + i) Nothing) | i <- [1 .. arity]] ++
gs
[U (HeapRef $ addr + i) | i <- [1 .. arity]] ++ gs
}
}
_ -> ifail "dangling goal ref"