Collect function declaration symbols
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6
TODO
6
TODO
@ -9,3 +9,9 @@
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- Don't ignore relocations where the symbol is not defined in the symbol table.
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Report an error about an undefined symbol.
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- Don't hardcode symbols in symbolEntry.
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# Name analysis
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- Format error messages.
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- Name analyzer collects procedure names in the first run. Implement the second run,
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where the analyzer goes into and checks procedures.
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@ -1,39 +1,23 @@
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module Language.Elna.NameAnalysis
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( nameAnalysis
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-- , Error(..)
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, Error(..)
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) where
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import qualified Data.List.NonEmpty as NonEmpty
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import qualified Data.Vector as Vector
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import qualified Language.Elna.SymbolTable as SymbolTable
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import qualified Language.Elna.AST as AST
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import Language.Elna.SymbolTable
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( SymbolTable
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, empty
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--, Info(..)
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-- , ParameterInfo(..)
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, Info(..)
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, ParameterInfo(..)
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)
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nameAnalysis :: AST.Program -> SymbolTable -- Either Error SymbolTable
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nameAnalysis = const empty {- runExcept
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. flip runReaderT builtInSymbolTable
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. runNameAnalysis
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. program -}
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{-
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import Control.Monad.Trans.Except (Except, runExcept, throwE)
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import Control.Monad.Trans.Reader
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( ReaderT(..)
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, ask
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, asks
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, runReaderT
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, withReaderT
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)
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import Data.Functor ((<&>))
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import Language.Elna.Location (Identifier(..))
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import qualified Language.Elna.SymbolTable as SymbolTable
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import Language.Elna.Types (Type(..))
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import Control.Monad.Trans.Class (MonadTrans(..))
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import Control.Monad (foldM, unless)
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import qualified Data.List.NonEmpty as NonEmpty
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import Data.Foldable (traverse_)
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import qualified Data.Vector as Vector
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import Control.Monad (foldM)
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data Error
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= UndefinedTypeError Identifier
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@ -44,7 +28,7 @@ data Error
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deriving (Eq, Show)
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newtype NameAnalysis a = NameAnalysis
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{ runNameAnalysis :: ReaderT SymbolTable (Except Error) a
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{ runNameAnalysis :: Except Error a
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}
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instance Functor NameAnalysis
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@ -60,30 +44,77 @@ instance Monad NameAnalysis
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where
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(NameAnalysis x) >>= f = NameAnalysis $ x >>= (runNameAnalysis . f)
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program :: AST.Program -> NameAnalysis SymbolTable
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program (AST.Program declarations)
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= NameAnalysis ask
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>>= flip (foldM declaration) declarations
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nameAnalysis :: AST.Program -> Either Error SymbolTable
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nameAnalysis = runExcept
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. runNameAnalysis
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. program SymbolTable.builtInSymbolTable
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program :: SymbolTable -> AST.Program -> NameAnalysis SymbolTable
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program symbolTable (AST.Program declarations) = do
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globalTable <- foldM procedureDeclaration symbolTable declarations
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foldM declaration globalTable declarations
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procedureDeclaration :: SymbolTable -> AST.Declaration -> NameAnalysis SymbolTable
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procedureDeclaration globalTable (AST.ProcedureDeclaration identifier parameters _ _) = do
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parametersInfo <- mapM (parameter globalTable) parameters
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let procedureInfo = ProcedureInfo SymbolTable.empty
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$ Vector.fromList parametersInfo
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maybe (NameAnalysis $ throwE $ IdentifierAlreadyDefinedError identifier) pure
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$ SymbolTable.enter identifier procedureInfo globalTable
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declaration :: SymbolTable -> AST.Declaration -> NameAnalysis SymbolTable
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declaration globalTable (AST.TypeDefinition identifier typeExpression)
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= withSymbolTable globalTable (dataType typeExpression)
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>>= flip (enter identifier) globalTable . TypeInfo
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declaration globalTable (AST.ProcedureDefinition identifier parameters variables body) = do
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parametersInfo <- mapM parameter parameters
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variableInfo <- mapM variableDeclaration variables
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newTable <- either (identifierAlreadyDefinedError . NonEmpty.head) pure
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declaration globalTable (AST.ProcedureDeclaration identifier parameters variables body) = do
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variableInfo <- mapM (variableDeclaration globalTable) variables
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parameterInfo <- mapM (parameterToVariableInfo globalTable) parameters
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procedureTable <- fmap (SymbolTable.scope globalTable)
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$ either (NameAnalysis . throwE . IdentifierAlreadyDefinedError . NonEmpty.head) pure
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$ SymbolTable.fromList
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$ fmap parameterToVariableInfo parametersInfo
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<> variableInfo
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traverse_ (statement globalTable) body
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let procedureInfo = ProcedureInfo newTable
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$ Vector.fromList parametersInfo
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enter identifier procedureInfo globalTable
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$ parameterInfo <> variableInfo
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traverse_ (statement procedureTable) body
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pure $ SymbolTable.update (updater procedureTable) identifier globalTable
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where
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updater procedureTable (ProcedureInfo _ parameters') = Just
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$ ProcedureInfo procedureTable parameters'
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updater _ _ = Nothing
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parameterToVariableInfo :: SymbolTable -> AST.Parameter -> NameAnalysis (Identifier, Info)
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parameterToVariableInfo symbolTable (AST.Parameter identifier typeExpression isReferenceParameter')
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= (identifier,) . VariableInfo isReferenceParameter'
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<$> dataType symbolTable typeExpression
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variableDeclaration :: SymbolTable -> AST.VariableDeclaration -> NameAnalysis (Identifier, Info)
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variableDeclaration globalTable (AST.VariableDeclaration identifier typeExpression)
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= (identifier,) . VariableInfo False
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<$> dataType globalTable typeExpression
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parameter :: SymbolTable -> AST.Parameter -> NameAnalysis ParameterInfo
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parameter environmentSymbolTable (AST.Parameter identifier typeExpression isReferenceParameter') = do
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parameterType <- dataType environmentSymbolTable typeExpression
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case parameterType of
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ArrayType _ _
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| not isReferenceParameter' -> NameAnalysis
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$ throwE $ UnexpectedArrayByValue identifier
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_ ->
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let parameterInfo = ParameterInfo
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{ name = identifier
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, type' = parameterType
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, isReferenceParameter = isReferenceParameter'
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}
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in pure parameterInfo
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dataType :: SymbolTable -> AST.TypeExpression -> NameAnalysis Type
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dataType environmentSymbolTable (AST.NamedType baseType) = do
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case SymbolTable.lookup baseType environmentSymbolTable of
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Just baseInfo
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| TypeInfo baseType' <- baseInfo -> pure baseType'
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| otherwise -> NameAnalysis $ throwE $ UnexpectedTypeInfoError baseInfo
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_ -> NameAnalysis $ throwE $ UndefinedTypeError baseType
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dataType environmentSymbolTable (AST.ArrayType arraySize baseType) =
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dataType environmentSymbolTable baseType <&> ArrayType arraySize
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statement :: SymbolTable -> AST.Statement -> NameAnalysis ()
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statement _ AST.EmptyStatement = pure ()
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statement globalTable (AST.AssignmentStatement lvalue rvalue)
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{- statement globalTable (AST.AssignmentStatement lvalue rvalue)
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= variableAccess globalTable lvalue
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>> expression globalTable rvalue
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statement globalTable (AST.IfStatement ifCondition ifStatement elseStatement)
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@ -170,41 +201,4 @@ variableDeclaration :: AST.VariableDeclaration -> NameAnalysis (Identifier, Info
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variableDeclaration (AST.VariableDeclaration identifier typeExpression)
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= (identifier,) . VariableInfo False
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<$> dataType typeExpression
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parameter :: AST.Parameter -> NameAnalysis ParameterInfo
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parameter (AST.Parameter identifier typeExpression isReferenceParameter') = do
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parameterType <- dataType typeExpression
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case parameterType of
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ArrayType _ _
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| not isReferenceParameter' -> NameAnalysis
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$ lift $ throwE $ UnexpectedArrayByValue identifier
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_ ->
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let parameterInfo = ParameterInfo
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{ name = identifier
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, type' = parameterType
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, isReferenceParameter = isReferenceParameter'
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}
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in pure parameterInfo
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parameterToVariableInfo :: ParameterInfo -> (Identifier, Info)
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parameterToVariableInfo ParameterInfo{..} =
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( name
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, VariableInfo isReferenceParameter type'
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)
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withSymbolTable :: forall a. SymbolTable -> NameAnalysis a -> NameAnalysis a
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withSymbolTable symbolTable' = NameAnalysis
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. withReaderT (const symbolTable')
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. runNameAnalysis
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dataType :: AST.TypeExpression -> NameAnalysis Type
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dataType (AST.NamedType baseType) = do
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environmentSymbolTable <- NameAnalysis ask
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case SymbolTable.lookup baseType environmentSymbolTable of
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Just baseInfo
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| TypeInfo baseType' <- baseInfo -> pure baseType'
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| otherwise -> NameAnalysis $ lift $ throwE $ UnexpectedTypeInfoError baseInfo
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_ -> NameAnalysis $ lift $ throwE $ UndefinedTypeError baseType
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dataType (AST.ArrayType arraySize baseType) =
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dataType baseType <&> ArrayType arraySize
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-}
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@ -1,64 +1,72 @@
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module Language.Elna.SymbolTable
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( SymbolTable
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, empty
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{-, Info(..)
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, Info(..)
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, ParameterInfo(..)
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, builtInSymbolTable
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, empty
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, enter
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, fromList
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, lookup
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, member -}
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, member
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, scope
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, toMap
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, update
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) where
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data SymbolTable = SymbolTable -- (HashMap Identifier Info)
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deriving (Eq, Show)
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empty :: SymbolTable
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empty = SymbolTable -- HashMap.empty
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{-
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import Data.HashMap.Strict (HashMap)
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import qualified Data.HashMap.Strict as HashMap
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import Data.List (sort)
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import Data.List.NonEmpty (NonEmpty)
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import qualified Data.List.NonEmpty as NonEmpty
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import Data.Maybe (isJust)
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import Data.Vector (Vector)
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import Language.Elna.Location (Identifier(..))
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import Language.Elna.Types (Type(..), intType, booleanType)
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import Prelude hiding (lookup)
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instance Semigroup SymbolTable
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where
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(SymbolTable lhs) <> (SymbolTable rhs) = SymbolTable $ rhs <> lhs
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data SymbolTable = SymbolTable (Maybe SymbolTable) (HashMap Identifier Info)
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deriving (Eq, Show)
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instance Monoid SymbolTable
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where
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mempty = empty
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empty :: SymbolTable
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empty = SymbolTable Nothing HashMap.empty
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update :: (Info -> Maybe Info) -> Identifier -> SymbolTable -> SymbolTable
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update updater key (SymbolTable parent mappings) = SymbolTable parent
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$ HashMap.update updater key mappings
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scope :: SymbolTable -> SymbolTable -> SymbolTable
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scope parent (SymbolTable _ mappings) = SymbolTable (Just parent) mappings
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builtInSymbolTable :: SymbolTable
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builtInSymbolTable = SymbolTable $ HashMap.fromList
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builtInSymbolTable = SymbolTable Nothing $ HashMap.fromList
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[ ("boolean", TypeInfo booleanType)
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, ("int", TypeInfo intType)
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]
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toMap :: SymbolTable -> HashMap Identifier Info
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toMap (SymbolTable _ map') = map'
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enter :: Identifier -> Info -> SymbolTable -> Maybe SymbolTable
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enter identifier info table@(SymbolTable hashTable)
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enter identifier info table@(SymbolTable parent hashTable)
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| member identifier table = Nothing
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| otherwise = Just
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$ SymbolTable
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$ HashMap.insert identifier info hashTable
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$ SymbolTable parent (HashMap.insert identifier info hashTable)
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lookup :: Identifier -> SymbolTable -> Maybe Info
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lookup identifier (SymbolTable table) = HashMap.lookup identifier table
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lookup identifier (SymbolTable parent table)
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| Just found <- HashMap.lookup identifier table = Just found
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| Just parent' <- parent = lookup identifier parent'
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| otherwise = Nothing
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member :: Identifier -> SymbolTable -> Bool
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member identifier (SymbolTable table) = HashMap.member identifier table
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member identifier table =
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isJust $ lookup identifier table
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fromList :: [(Identifier, Info)] -> Either (NonEmpty Identifier) SymbolTable
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fromList elements
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| Just identifierDuplicates' <- identifierDuplicates =
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Left identifierDuplicates'
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| otherwise = Right $ SymbolTable $ HashMap.fromList elements
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| otherwise = Right $ SymbolTable Nothing $ HashMap.fromList elements
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where
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identifierDuplicates = NonEmpty.nonEmpty
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$ fmap NonEmpty.head
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@ -77,4 +85,3 @@ data Info
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| VariableInfo Bool Type
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| ProcedureInfo SymbolTable (Vector ParameterInfo)
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deriving (Eq, Show)
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-}
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14
src/Main.hs
14
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@ -25,11 +25,13 @@ main = execParser commandLine >>= withCommandLine
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>>= withParsedInput defaultOutput
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. runParser programP input
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withParsedInput output (Right program) =
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let symbolTable = nameAnalysis program
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_ = typeAnalysis symbolTable program
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intermediate' = intermediate symbolTable program
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in elfObject output
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$ riscv32Elf
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$ generateCode symbolTable intermediate'
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either print (withSymbolTable output program)
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$ nameAnalysis program
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withParsedInput _ (Left errorBundle) = putStrLn
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$ errorBundlePretty errorBundle
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withSymbolTable output program symbolTable =
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let _ = typeAnalysis symbolTable program
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intermediate' = intermediate symbolTable program
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instructions = generateCode symbolTable intermediate'
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in elfObject output
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$ riscv32Elf instructions
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