mirror of https://github.com/zachjs/sv2v.git
500 lines
22 KiB
Haskell
500 lines
22 KiB
Haskell
{- sv2v
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- Author: Zachary Snow <zach@zachjs.com>
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-
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- Conversion for `struct packed` and `union packed`
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-}
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module Convert.Struct (convert) where
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import Control.Monad.State
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import Control.Monad.Writer
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import Data.List (elemIndex, sortOn)
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import Data.Maybe (fromJust, isJust)
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import Data.Tuple (swap)
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import qualified Data.Map.Strict as Map
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import qualified Data.Set as Set
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import Convert.Traverse
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import Language.SystemVerilog.AST
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type TypeFunc = [Range] -> Type
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type StructInfo = (Type, Map.Map Identifier (Range, Expr))
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type Structs = Map.Map TypeFunc StructInfo
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type Types = Map.Map Identifier Type
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type Idents = Set.Set Identifier
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convert :: [AST] -> [AST]
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convert = map $ traverseDescriptions convertDescription
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convertDescription :: Description -> Description
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convertDescription (description @ (Part _ _ _ _ _ _)) =
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traverseModuleItems (traverseTypes $ convertType structs) $
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Part extern kw lifetime name ports (items ++ funcs)
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where
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description' @ (Part extern kw lifetime name ports items) =
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scopedConversion (traverseDeclM structs) traverseModuleItemM
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traverseStmtM tfArgTypes description
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-- collect information about this description
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structs = execWriter $ collectModuleItemsM
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(collectTypesM collectStructM) description
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tfArgTypes = execWriter $ collectModuleItemsM collectTFArgsM description
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-- determine which of the packer functions we actually need
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calledFuncs = execWriter $ collectModuleItemsM
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(collectExprsM $ collectNestedExprsM collectCallsM) description'
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packerFuncs = Set.map packerFnName $ Map.keysSet structs
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calledPackedFuncs = Set.intersection calledFuncs packerFuncs
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funcs = map packerFn $ filter isNeeded $ Map.keys structs
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isNeeded tf = Set.member (packerFnName tf) calledPackedFuncs
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-- helpers for the scoped traversal
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traverseModuleItemM :: ModuleItem -> State Types ModuleItem
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traverseModuleItemM item =
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traverseExprsM traverseExprM item >>=
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traverseAsgnsM traverseAsgnM
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traverseStmtM :: Stmt -> State Types Stmt
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traverseStmtM (Subroutine Nothing f args) = do
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stateTypes <- get
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return $ uncurry (Subroutine Nothing) $
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convertCall structs stateTypes f args
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traverseStmtM stmt =
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traverseStmtExprsM traverseExprM stmt >>=
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traverseStmtAsgnsM traverseAsgnM
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traverseExprM =
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traverseNestedExprsM $ stately converter
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where
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converter :: Types -> Expr -> Expr
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converter types expr =
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snd $ convertAsgn structs types (LHSIdent "", expr)
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traverseAsgnM = stately $ convertAsgn structs
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convertDescription other = other
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-- write down unstructured versions of packed struct types
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collectStructM :: Type -> Writer Structs ()
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collectStructM (Struct (Packed sg) fields _) =
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collectStructM' Struct True sg fields
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collectStructM (Union (Packed sg) fields _) =
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collectStructM' Union False sg fields
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collectStructM _ = return ()
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collectStructM'
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:: (Packing -> [Field] -> [Range] -> Type)
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-> Bool -> Signing -> [Field] -> Writer Structs ()
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collectStructM' constructor isStruct sg fields = do
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if canUnstructure
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then tell $ Map.singleton
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(constructor (Packed sg) fields)
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(unstructType, unstructFields)
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else return ()
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where
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zero = Number "0"
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typeRange :: Type -> Range
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typeRange t =
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if null ranges then (zero, zero) else head ranges
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where ranges = snd $ typeRanges t
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-- extract info about the fields
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fieldTypes = map fst fields
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fieldRanges = map typeRange fieldTypes
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fieldSizes = map rangeSize fieldRanges
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-- layout the fields into the unstructured type; note that `scanr` is
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-- used here because SystemVerilog structs are laid out backwards
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fieldLos =
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if isStruct
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then map simplify $ tail $ scanr (BinOp Add) (Number "0") fieldSizes
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else map simplify $ repeat (Number "0")
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fieldHis =
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if isStruct
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then map simplify $ init $ scanr (BinOp Add) (Number "-1") fieldSizes
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else map simplify $ map (BinOp Add (Number "-1")) fieldSizes
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-- create the mapping structure for the unstructured fields
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unstructOffsets = map simplify $ map snd fieldRanges
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unstructRanges = zip fieldHis fieldLos
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keys = map snd fields
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vals = zip unstructRanges unstructOffsets
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unstructFields = Map.fromList $ zip keys vals
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-- create the unstructured type; result type takes on the signing of the
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-- struct itself to preserve behavior of operations on the whole struct
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structSize =
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if isStruct
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then foldl1 (BinOp Add) fieldSizes
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else head fieldSizes
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packedRange = (simplify $ BinOp Sub structSize (Number "1"), zero)
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unstructType = IntegerVector TLogic sg [packedRange]
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-- check if this struct can be packed into an integer vector; integer
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-- atoms and non-integers do not have a definitive size, and so cannot
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-- be packed; net types are not permitted as struct fields
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isIntVec :: Type -> Bool
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isIntVec (IntegerVector _ _ _) = True
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isIntVec _ = False
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canUnstructure = all isIntVec fieldTypes
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-- convert a struct type to its unstructured equivalent
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convertType :: Structs -> Type -> Type
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convertType structs t1 =
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case Map.lookup tf1 structs of
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Nothing -> t1
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Just (t2, _) -> tf2 (rs1 ++ rs2)
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where (tf2, rs2) = typeRanges t2
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where (tf1, rs1) = typeRanges t1
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-- writes down the names of called functions
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collectCallsM :: Expr -> Writer Idents ()
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collectCallsM (Call Nothing f _) = tell $ Set.singleton f
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collectCallsM _ = return ()
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collectTFArgsM :: ModuleItem -> Writer Types ()
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collectTFArgsM (MIPackageItem item) = do
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_ <- case item of
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Function _ t f decls _ -> do
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tell $ Map.singleton f t
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mapM (collect f) (zip [0..] decls)
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Task _ f decls _ ->
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mapM (collect f) (zip [0..] decls)
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_ -> return []
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return ()
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where
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collect :: Identifier -> (Int, Decl) -> Writer Types ()
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collect f (idx, (Variable _ t x _ _)) = do
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tell $ Map.singleton (f ++ ":" ++ show idx) t
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tell $ Map.singleton (f ++ ":" ++ x) t
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collect _ _ = return ()
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collectTFArgsM _ = return ()
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-- write down the types of declarations
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traverseDeclM :: Structs -> Decl -> State Types Decl
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traverseDeclM structs origDecl = do
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case origDecl of
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Variable d t x a me -> do
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let (tf, rs) = typeRanges t
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modify $ Map.insert x (tf $ a ++ rs)
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case me of
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Nothing -> return origDecl
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Just e -> do
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e' <- convertDeclExpr x e
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return $ Variable d t x a (Just e')
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Param s t x e -> do
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modify $ Map.insert x t
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e' <- convertDeclExpr x e
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return $ Param s t x e'
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ParamType s x mt ->
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return $ ParamType s x mt
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where
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convertDeclExpr :: Identifier -> Expr -> State Types Expr
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convertDeclExpr x e = do
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types <- get
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let (LHSIdent _, e') = convertAsgn structs types (LHSIdent x, e)
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return e'
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-- produces a function which packs the components of a struct literal
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packerFn :: TypeFunc -> ModuleItem
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packerFn structTf =
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MIPackageItem $
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Function Nothing (structTf []) fnName decls [retStmt]
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where
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Struct (Packed _) fields [] = structTf []
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toInput (t, x) = Variable Input t x [] Nothing
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decls = map toInput fields
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retStmt = Return $ Concat $ map (Ident . snd) fields
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fnName = packerFnName structTf
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-- returns a "unique" name for the packer for a given struct type
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packerFnName :: TypeFunc -> Identifier
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packerFnName structTf =
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"sv2v_struct_" ++ shortHash structTf
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-- This is where the magic happens. This is responsible for converting struct
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-- accesses, assignments, and literals, given appropriate information about the
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-- structs and the current declaration context. The general strategy involves
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-- looking at the innermost type of a node to convert outer uses of fields, and
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-- then using the outermost type to figure out the corresponding struct
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-- definition for struct literals that are encountered.
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convertAsgn :: Structs -> Types -> (LHS, Expr) -> (LHS, Expr)
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convertAsgn structs types (lhs, expr) =
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(lhs', expr')
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where
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(typ, lhs') = convertLHS lhs
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expr' = snd $ convertSubExpr $ convertExpr typ expr
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-- converting LHSs by looking at the innermost types first
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convertLHS :: LHS -> (Type, LHS)
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convertLHS (LHSIdent x) =
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case Map.lookup x types of
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Nothing -> (Implicit Unspecified [], LHSIdent x)
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Just t -> (t, LHSIdent x)
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convertLHS (LHSBit l e) =
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case l' of
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LHSRange lInner NonIndexed (_, loI) ->
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(t', LHSBit lInner (simplify $ BinOp Add loI e))
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LHSRange lInner IndexedPlus (baseI, _) ->
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(t', LHSBit lInner (simplify $ BinOp Add baseI e))
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_ -> (t', LHSBit l' e)
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where
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(t, l') = convertLHS l
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t' = case typeRanges t of
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(_, []) -> Implicit Unspecified []
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(tf, rs) -> tf $ tail rs
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convertLHS (LHSRange lOuter NonIndexed rOuter) =
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case lOuter' of
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LHSRange lInner NonIndexed (_, loI) ->
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(t, LHSRange lInner NonIndexed (simplify hi, simplify lo))
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where
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lo = BinOp Add loI loO
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hi = BinOp Add loI hiO
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LHSRange lInner IndexedPlus (baseI, _) ->
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(t, LHSRange lInner IndexedPlus (simplify base, simplify len))
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where
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base = BinOp Add baseI loO
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len = rangeSize rOuter
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_ -> (t, LHSRange lOuter' NonIndexed rOuter)
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where
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(hiO, loO) = rOuter
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(t, lOuter') = convertLHS lOuter
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convertLHS (LHSRange l m r) =
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(t', LHSRange l' m r)
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where
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(t, l') = convertLHS l
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t' = case typeRanges t of
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(_, []) -> Implicit Unspecified []
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(tf, rs) -> tf $ tail rs
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convertLHS (LHSDot l x ) =
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case t of
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InterfaceT _ _ _ -> (Implicit Unspecified [], LHSDot l' x)
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Struct p fields [] -> undot (Struct p fields) fields
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Union p fields [] -> undot (Union p fields) fields
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Implicit sg _ -> (Implicit sg [], LHSDot l' x)
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_ -> error $ "convertLHS encountered dot for bad type: " ++ show (t, l, x)
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where
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(t, l') = convertLHS l
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undot structTf fields = case Map.lookup structTf structs of
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Nothing -> (fieldType, LHSDot l' x)
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Just (structT, m) -> (tf [tr], LHSRange l' NonIndexed r)
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where
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(tf, _) = typeRanges structT
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(r @ (hi, lo), base) = m Map.! x
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hi' = BinOp Add base $ BinOp Sub hi lo
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lo' = base
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tr = (simplify hi', simplify lo')
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where
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fieldType = lookupFieldType fields x
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convertLHS (LHSConcat lhss) =
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(Implicit Unspecified [], LHSConcat $ map (snd . convertLHS) lhss)
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convertLHS (LHSStream o e lhss) =
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(Implicit Unspecified [], LHSStream o e $ map (snd . convertLHS) lhss)
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defaultKey = Just "default"
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-- try expression conversion by looking at the *outermost* type first
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convertExpr :: Type -> Expr -> Expr
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-- TODO: This is really a conversion for using default patterns to
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-- populate arrays. Maybe this should be somewhere else?
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convertExpr (IntegerVector t sg (r:rs)) (Pattern [(Just "default", e)]) =
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Repeat (rangeSize r) [e']
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where e' = convertExpr (IntegerVector t sg rs) e
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convertExpr (Struct (Packed sg) fields (_:rs)) (Concat exprs) =
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Concat $ map (convertExpr (Struct (Packed sg) fields rs)) exprs
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convertExpr (Struct (Packed sg) fields (_:rs)) (Bit e _) =
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convertExpr (Struct (Packed sg) fields rs) e
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convertExpr (Struct (Packed sg) fields rs) (Pattern [(Just "default", e)]) =
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if Map.notMember structTf structs then
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Pattern [(defaultKey, e)]
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else if null rs then
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expanded
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else
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Repeat (dimensionsSize rs) [expanded]
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where
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structTf = Struct (Packed sg) fields
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expanded = convertExpr (structTf []) $ Pattern $
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take (length fields) (repeat (Nothing, e))
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convertExpr (Struct (Packed sg) fields []) (Pattern itemsOrig) =
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if length items /= length fields then
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error $ "struct pattern " ++ show items ++
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" doesn't have the same # of items as " ++ show structTf
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else if itemsFieldNames /= fieldNames then
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error $ "struct pattern " ++ show items ++ " has fields " ++
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show itemsFieldNames ++ ", but struct type has fields " ++
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show fieldNames
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else if Map.notMember structTf structs then
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Pattern items
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else
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Call Nothing fnName $ Args (map (Just . snd) items) []
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where
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subMap = \(Just ident, subExpr) ->
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(Just ident, convertExpr (lookupFieldType fields ident) subExpr)
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structTf = Struct (Packed sg) fields
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itemsNamed =
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-- if the pattern does not use identifiers, use the
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-- identifiers from the struct type definition in order
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if not (all (isJust . fst) itemsOrig) then
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zip (map (Just. snd) fields) (map snd itemsOrig)
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-- if the pattern has a default value, use that for any
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-- missing fields
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else if any ((== defaultKey) . fst) itemsOrig then
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let origValueMap = Map.fromList itemsOrig
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origValues = Map.delete defaultKey origValueMap
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defaultValue = origValueMap Map.! defaultKey
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defaultValues = Map.fromList $
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zip (map Just fieldNames) (repeat defaultValue)
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in Map.toList $ Map.union origValues defaultValues
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else
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itemsOrig
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items = sortOn itemPosition $ map subMap itemsNamed
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fieldNames = map snd fields
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itemsFieldNames = map (fromJust . fst) items
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itemPosition = \(Just x, _) -> fromJust $ elemIndex x fieldNames
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fnName = packerFnName structTf
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convertExpr _ other = other
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-- try expression conversion by looking at the *innermost* type first
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convertSubExpr :: Expr -> (Type, Expr)
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convertSubExpr (Ident x) =
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case Map.lookup x types of
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Nothing -> (Implicit Unspecified [], Ident x)
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Just t -> (t, Ident x)
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convertSubExpr (Dot e x) =
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case subExprType of
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Struct p fields [] -> undot (Struct p fields) fields
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Union p fields [] -> undot (Union p fields) fields
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_ -> (Implicit Unspecified [], Dot e' x)
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where
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(subExprType, e') = convertSubExpr e
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undot structTf fields =
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if Map.notMember structTf structs
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then (fieldType, Dot e' x)
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else (fieldType, Range e' NonIndexed r)
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where
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fieldType = lookupFieldType fields x
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r = lookupUnstructRange structTf x
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convertSubExpr (Range eOuter NonIndexed (rOuter @ (hiO, loO))) =
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-- VCS doesn't allow ranges to be cascaded, so we need to combine
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-- nested Ranges into a single range. My understanding of the
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-- semantics are that a range returns a new, zero-indexed sub-range.
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case eOuter' of
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Range eInner NonIndexed (_, loI) ->
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(t, Range eInner NonIndexed (simplify hi, simplify lo))
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where
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lo = BinOp Add loI loO
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hi = BinOp Add loI hiO
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Range eInner IndexedPlus (baseI, _) ->
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(t, Range eInner IndexedPlus (simplify base, simplify len))
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where
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base = BinOp Add baseI loO
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len = rangeSize rOuter
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_ -> (t, Range eOuter' NonIndexed rOuter)
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where (t, eOuter') = convertSubExpr eOuter
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convertSubExpr (Range e m r) =
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(t', Range e' m r)
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where
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(t, e') = convertSubExpr e
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t' = case typeRanges t of
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(_, []) -> Implicit Unspecified []
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(tf, rs) -> tf $ tail rs
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convertSubExpr (Concat exprs) =
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(Implicit Unspecified [], Concat $ map (snd . convertSubExpr) exprs)
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convertSubExpr (Stream o e exprs) =
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(Implicit Unspecified [], Stream o e' exprs')
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where
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e' = (snd . convertSubExpr) e
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exprs' = map (snd . convertSubExpr) exprs
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convertSubExpr (BinOp op e1 e2) =
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(Implicit Unspecified [], BinOp op e1' e2')
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where
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(_, e1') = convertSubExpr e1
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(_, e2') = convertSubExpr e2
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convertSubExpr (Bit e i) =
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case e' of
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Range eInner NonIndexed (_, loI) ->
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(t', Bit eInner (simplify $ BinOp Add loI i'))
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Range eInner IndexedPlus (baseI, _) ->
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(t', Bit eInner (simplify $ BinOp Add baseI i'))
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_ -> (t', Bit e' i')
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where
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(t, e') = convertSubExpr e
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t' = case typeRanges t of
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(_, []) -> Implicit Unspecified []
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(tf, rs) -> tf $ tail rs
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(_, i') = convertSubExpr i
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convertSubExpr (Call Nothing f args) =
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(retType, uncurry (Call Nothing) $ convertCall structs types f args)
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where
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retType = case Map.lookup f types of
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Nothing -> Implicit Unspecified []
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Just t -> t
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convertSubExpr (Call (Just x) f args) =
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(Implicit Unspecified [], Call (Just x) f args)
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convertSubExpr (String s) = (Implicit Unspecified [], String s)
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convertSubExpr (Number n) = (Implicit Unspecified [], Number n)
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convertSubExpr (PSIdent x y) = (Implicit Unspecified [], PSIdent x y)
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convertSubExpr (Repeat e es) =
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(Implicit Unspecified [], Repeat e' es')
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where
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(_, e') = convertSubExpr e
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es' = map (snd . convertSubExpr) es
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convertSubExpr (UniOp op e) =
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(Implicit Unspecified [], UniOp op e')
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where (_, e') = convertSubExpr e
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convertSubExpr (Mux a b c) =
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(t, Mux a' b' c')
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where
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(_, a') = convertSubExpr a
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(t, b') = convertSubExpr b
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(_, c') = convertSubExpr c
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convertSubExpr (Cast (Left t) sub) =
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(t, Cast (Left t) (snd $ convertSubExpr sub))
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convertSubExpr (Cast (Right e) sub) =
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(Implicit Unspecified [], Cast (Right e) (snd $ convertSubExpr sub))
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convertSubExpr (DimsFn f tore) =
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(Implicit Unspecified [], DimsFn f tore')
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where tore' = convertTypeOrExpr tore
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convertSubExpr (DimFn f tore e) =
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(Implicit Unspecified [], DimFn f tore' e')
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where
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tore' = convertTypeOrExpr tore
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e' = snd $ convertSubExpr e
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convertSubExpr (Pattern items) =
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if all (== Nothing) $ map fst items'
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then (Implicit Unspecified [], Concat $ map snd items')
|
|
else (Implicit Unspecified [], Pattern items')
|
|
where
|
|
items' = map mapItem items
|
|
mapItem (mx, e) = (mx, snd $ convertSubExpr e)
|
|
convertSubExpr Nil = (Implicit Unspecified [], Nil)
|
|
|
|
convertTypeOrExpr :: TypeOrExpr -> TypeOrExpr
|
|
convertTypeOrExpr (Left t) = Left t
|
|
convertTypeOrExpr (Right e) = Right $ snd $ convertSubExpr e
|
|
|
|
-- lookup the range of a field in its unstructured type
|
|
lookupUnstructRange :: TypeFunc -> Identifier -> Range
|
|
lookupUnstructRange structTf fieldName =
|
|
case Map.lookup fieldName fieldRangeMap of
|
|
Nothing -> error $ "field '" ++ fieldName ++
|
|
"' not found in struct: " ++ show structTf
|
|
Just r -> r
|
|
where fieldRangeMap = Map.map fst $ snd $ structs Map.! structTf
|
|
|
|
-- lookup the type of a field in the given field list
|
|
lookupFieldType :: [(Type, Identifier)] -> Identifier -> Type
|
|
lookupFieldType fields fieldName = fieldMap Map.! fieldName
|
|
where fieldMap = Map.fromList $ map swap fields
|
|
|
|
-- attempts to convert based on the assignment-like contexts of TF arguments
|
|
convertCall :: Structs -> Types -> Identifier -> Args -> (Identifier, Args)
|
|
convertCall structs types f (Args pnArgs kwArgs) =
|
|
(f, args)
|
|
where
|
|
idxs = map show ([0..] :: [Int])
|
|
args = Args
|
|
(map snd $ map convertArg $ zip idxs pnArgs)
|
|
(map convertArg kwArgs)
|
|
convertArg :: (Identifier, Maybe Expr) -> (Identifier, Maybe Expr)
|
|
convertArg (x, Nothing) = (x, Nothing)
|
|
convertArg (x, Just e ) = (x, Just e')
|
|
where
|
|
(_, e') = convertAsgn structs types
|
|
(LHSIdent $ f ++ ":" ++ x, e)
|
|
|