542 lines
21 KiB
Haskell
542 lines
21 KiB
Haskell
{-# LANGUAGE LambdaCase #-}
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{-# LANGUAGE OverloadedStrings #-}
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module Codegen.Codegen (generateCode) where
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import Auxiliary (snoc)
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import Codegen.LlvmIr as LIR
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import Control.Applicative ((<|>))
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import Control.Monad.State (StateT, execStateT, foldM_,
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gets, modify)
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import qualified Data.Bifunctor as BI
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import Data.Coerce (coerce)
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import Data.Map (Map)
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import qualified Data.Map as Map
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import Data.Maybe (fromJust, fromMaybe)
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import Data.Tuple.Extra (dupe, first, second)
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import qualified Grammar.Abs as GA
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import Grammar.ErrM (Err)
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import Monomorphizer.MonomorphizerIr as MIR
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-- | The record used as the code generator state
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data CodeGenerator = CodeGenerator
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{ instructions :: [LLVMIr]
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, functions :: Map MIR.Id FunctionInfo
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, constructors :: Map MIR.Id ConstructorInfo
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, variableCount :: Integer
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, labelCount :: Integer
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}
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-- | A state type synonym
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type CompilerState a = StateT CodeGenerator Err a
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data FunctionInfo = FunctionInfo
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{ numArgs :: Int
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, arguments :: [Id]
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}
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deriving (Show)
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data ConstructorInfo = ConstructorInfo
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{ numArgsCI :: Int
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, argumentsCI :: [Id]
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, numCI :: Integer
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}
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deriving (Show)
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-- | Adds a instruction to the CodeGenerator state
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emit :: LLVMIr -> CompilerState ()
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emit l = modify $ \t -> t{instructions = Auxiliary.snoc l $ instructions t}
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-- | Increases the variable counter in the CodeGenerator state
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increaseVarCount :: CompilerState ()
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increaseVarCount = modify $ \t -> t{variableCount = variableCount t + 1}
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-- | Returns the variable count from the CodeGenerator state
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getVarCount :: CompilerState Integer
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getVarCount = gets variableCount
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-- | Increases the variable count and returns it from the CodeGenerator state
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getNewVar :: CompilerState GA.Ident
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getNewVar = (GA.Ident . show) <$> (increaseVarCount >> getVarCount)
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-- | Increses the label count and returns a label from the CodeGenerator state
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getNewLabel :: CompilerState Integer
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getNewLabel = do
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modify (\t -> t{labelCount = labelCount t + 1})
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gets labelCount
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{- | Produces a map of functions infos from a list of binds,
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which contains useful data for code generation.
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-}
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getFunctions :: [MIR.Def] -> Map Id FunctionInfo
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getFunctions bs = Map.fromList $ go bs
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where
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go [] = []
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go (MIR.DBind (MIR.Bind id args _) : xs) =
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(id, FunctionInfo{numArgs = length args, arguments = args})
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: go xs
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go (MIR.DData (MIR.Data n cons) : xs) =
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do map
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( \(Constructor id xs) ->
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( (coerce id, MIR.TLit (extractTypeName n))
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, FunctionInfo
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{ numArgs = length xs
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, arguments = createArgs (snd <$> xs)
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}
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)
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)
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cons
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<> go xs
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createArgs :: [MIR.Type] -> [Id]
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createArgs xs = fst $ foldl (\(acc, l) t -> (acc ++ [(GA.Ident ("arg_" <> show l), t)], l + 1)) ([], 0) xs
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{- | Produces a map of functions infos from a list of binds,
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which contains useful data for code generation.
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-}
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getConstructors :: [MIR.Def] -> Map MIR.Id ConstructorInfo
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getConstructors bs = Map.fromList $ go bs
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where
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go [] = []
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go (MIR.DData (MIR.Data t cons) : xs) =
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do
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let (GA.Ident n) = extractTypeName t
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fst
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( foldl
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( \(acc, i) (Constructor (GA.UIdent id) xs) ->
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( ( (GA.Ident (n <> "_" <> id), MIR.TLit (coerce n))
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, ConstructorInfo
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{ numArgsCI = length xs
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, argumentsCI = createArgs (snd <$> xs)
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, numCI = i
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}
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)
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: acc
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, i + 1
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)
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)
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([], 0)
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cons
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)
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<> go xs
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go (_ : xs) = go xs
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initCodeGenerator :: [MIR.Def] -> CodeGenerator
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initCodeGenerator scs =
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CodeGenerator
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{ instructions = defaultStart
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, functions = getFunctions scs
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, constructors = getConstructors scs
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, variableCount = 0
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, labelCount = 0
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}
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{-
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run :: Err String -> IO ()
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run s = do
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let s' = case s of
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Right s -> s
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Left _ -> error "yo"
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writeFile "output/llvm.ll" s'
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putStrLn . trim =<< readCreateProcess (shell "lli") s'
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test :: Integer -> Program
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test v =
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Program
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[ DataType
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(GA.Ident "Craig")
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[ Constructor (GA.Ident "Bob") [MIR.Type (GA.Ident "_Int")]
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, Constructor (GA.Ident "Betty") [MIR.Type (GA.Ident "_Int")]
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]
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, DataType
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(GA.Ident "Alice")
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[ Constructor (GA.Ident "Eve") [MIR.Type (GA.Ident "_Int")] -- ,
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-- (GA.Ident "Alice", [TInt, TInt])
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]
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, Bind (GA.Ident "fibonacci", MIR.Type (GA.Ident "_Int")) [(GA.Ident "x", MIR.Type (GA.Ident "_Int"))] (EId ("x", MIR.Type (GA.Ident "Craig")), MIR.Type (GA.Ident "Craig"))
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, Bind (GA.Ident "main", MIR.Type (GA.Ident "_Int")) []
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-- (EApp (MIR.Type (GA.Ident "Craig")) (EId (GA.Ident "Craig_Bob", MIR.Type (GA.Ident "Craig")), MIR.Type (GA.Ident "Craig")) (ELit (LInt v), MIR.Type (GA.Ident "_Int")), MIR.Type (GA.Ident "Craig"))-- (EInt 92)
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$
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eCaseInt
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(EApp (MIR.TLit (GA.Ident "Craig")) (EId (GA.Ident "Craig_Bob", MIR.TLit (GA.Ident "Craig")), MIR.TLit (GA.Ident "Craig")) (ELit (LInt v), MIR.Type (GA.Ident "_Int")), MIR.Type (GA.Ident "Craig"))
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[ injectionCons "Craig_Bob" "Craig" [CIdent (GA.Ident "x")] (EId (GA.Ident "x", MIR.Type (GA.Ident "_Int")), MIR.Type (GA.Ident "_Int"))
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, injectionCons "Craig_Betty" "Craig" [CLit (LInt 5)] (int 2)
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, Injection (CIdent (GA.Ident "z")) (int 3)
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, -- , injectionInt 5 (int 6)
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injectionCatchAll (int 10)
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]
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]
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where
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injectionCons x y xs = Injection (CCons (GA.Ident x, MIR.Type (GA.Ident y)) xs)
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injectionInt x = Injection (CLit (LInt x))
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injectionCatchAll = Injection CatchAll
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eCaseInt x xs = (ECase (MIR.TLit (MIR.Ident "_Int")) x xs, MIR.TLit (MIR.Ident "_Int"))
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int x = (ELit (LInt x), MIR.TLit (MIR.Ident "_Int"))
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-}
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{- | Compiles an AST and produces a LLVM Ir string.
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An easy way to actually "compile" this output is to
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Simply pipe it to LLI
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-}
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generateCode :: MIR.Program -> Err String
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generateCode (MIR.Program scs) = do
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let codegen = initCodeGenerator scs
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llvmIrToString . instructions <$> execStateT (compileScs scs) codegen
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compileScs :: [MIR.Def] -> CompilerState ()
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compileScs [] = do
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-- as a last step create all the constructors
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-- //TODO maybe merge this with the data type match?
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c <- gets (Map.toList . constructors)
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mapM_
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( \((id, t), ci) -> do
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let t' = type2LlvmType t
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let x = BI.second type2LlvmType <$> argumentsCI ci
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emit $ Define FastCC t' id x
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top <- getNewVar
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ptr <- getNewVar
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-- allocated the primary type
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emit $ SetVariable top (Alloca t')
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-- set the first byte to the index of the constructor
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emit $
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SetVariable ptr $
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GetElementPtr
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t'
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(Ref t')
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(VIdent top I8)
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I64
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(VInteger 0)
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I32
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(VInteger 0)
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emit $ Store I8 (VInteger $ numCI ci) (Ref I8) ptr
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-- get a pointer of the correct type
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ptr' <- getNewVar
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emit $ SetVariable ptr' (Bitcast (Ref t') (VIdent top Ptr) (Ref $ CustomType id))
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-- emit $ UnsafeRaw "\n"
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enumerateOneM_
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( \i (GA.Ident arg_n, arg_t) -> do
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let arg_t' = type2LlvmType arg_t
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emit $ Comment (toIr arg_t' <> " " <> arg_n <> " " <> show i)
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elemPtr <- getNewVar
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emit $
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SetVariable
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elemPtr
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( GetElementPtr
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(CustomType id)
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(Ref (CustomType id))
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(VIdent ptr' Ptr)
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I64
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(VInteger 0)
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I32
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(VInteger i)
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)
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emit $ Store arg_t' (VIdent (GA.Ident arg_n) arg_t') Ptr elemPtr
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)
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(argumentsCI ci)
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-- emit $ UnsafeRaw "\n"
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-- load and return the constructed value
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emit $ Comment "Return the newly constructed value"
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load <- getNewVar
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emit $ SetVariable load (Load t' Ptr top)
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emit $ Ret t' (VIdent load t')
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emit DefineEnd
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modify $ \s -> s{variableCount = 0}
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)
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c
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compileScs (MIR.DBind (MIR.Bind (name, _t) args exp) : xs) = do
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emit $ UnsafeRaw "\n"
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emit . Comment $ show name <> ": " <> show exp
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let args' = map (second type2LlvmType) args
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emit $ Define FastCC I64 {-(type2LlvmType t_return)-} name args'
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functionBody <- exprToValue exp
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if name == "main"
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then mapM_ emit $ mainContent functionBody
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else emit $ Ret I64 functionBody
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emit DefineEnd
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modify $ \s -> s{variableCount = 0}
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compileScs xs
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compileScs (MIR.DData (MIR.Data typ ts) : xs) = do
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let (Ident outer_id) = extractTypeName typ
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let biggestVariant = maximum $ sum <$> (\(Constructor _ t) -> typeByteSize . type2LlvmType . snd <$> t) <$> ts
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emit $ LIR.Type (coerce outer_id) [I8, Array biggestVariant I8]
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mapM_
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( \(Constructor (GA.UIdent inner_id) fi) -> do
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emit $ LIR.Type (GA.Ident $ outer_id <> "_" <> inner_id) (I8 : map type2LlvmType (snd <$> fi))
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)
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ts
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compileScs xs
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mainContent :: LLVMValue -> [LLVMIr]
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mainContent var =
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[ UnsafeRaw $
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-- "%2 = alloca %Craig\n" <>
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-- " store %Craig %1, ptr %2\n" <>
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-- " %3 = bitcast %Craig* %2 to i72*\n" <>
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-- " %4 = load i72, ptr %3\n" <>
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-- " call i32 (ptr, ...) @printf(ptr noundef @.str, i72 noundef %4)\n"
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"call i32 (ptr, ...) @printf(ptr noundef @.str, i64 noundef " <> toIr var <> ")\n"
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, -- , SetVariable (GA.Ident "p") (Icmp LLEq I64 (VInteger 2) (VInteger 2))
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-- , BrCond (VIdent (GA.Ident "p")) (GA.Ident "b_1") (GA.Ident "b_2")
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-- , Label (GA.Ident "b_1")
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-- , UnsafeRaw
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-- "call i32 (ptr, ...) @printf(ptr noundef @.str, i64 noundef 1)\n"
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-- , Br (GA.Ident "end")
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-- , Label (GA.Ident "b_2")
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-- , UnsafeRaw
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-- "call i32 (ptr, ...) @printf(ptr noundef @.str, i64 noundef 2)\n"
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-- , Br (GA.Ident "end")
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-- , Label (GA.Ident "end")
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Ret I64 (VInteger 0)
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]
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defaultStart :: [LLVMIr]
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defaultStart =
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[ UnsafeRaw "target triple = \"x86_64-pc-linux-gnu\"\n"
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, UnsafeRaw "target datalayout = \"e-m:o-i64:64-f80:128-n8:16:32:64-S128\"\n"
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, UnsafeRaw "@.str = private unnamed_addr constant [3 x i8] c\"%x\n\", align 1\n"
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, UnsafeRaw "declare i32 @printf(ptr noalias nocapture, ...)\n"
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]
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compileExp :: ExpT -> CompilerState ()
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compileExp (MIR.ELit lit,t) = emitLit lit
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compileExp (MIR.EAdd e1 e2,t) = emitAdd t e1 e2
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-- compileExp (ESub t e1 e2) = emitSub t e1 e2
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compileExp (MIR.EId name,t) = emitIdent name
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compileExp (MIR.EApp e1 e2,t) = emitApp t e1 e2
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-- compileExp (EAbs t ti e) = emitAbs t ti e
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compileExp (MIR.ELet binds e,t) = undefined -- emitLet binds (fst e)
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compileExp (MIR.ECase e cs,t) = emitECased t e (map (t,) cs)
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-- go (EMul e1 e2) = emitMul e1 e2
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-- go (EDiv e1 e2) = emitDiv e1 e2
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-- go (EMod e1 e2) = emitMod e1 e2
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--- aux functions ---
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emitECased :: MIR.Type -> ExpT -> [(MIR.Type, Branch)] -> CompilerState ()
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emitECased t e cases = do
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let cs = snd <$> cases
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let ty = type2LlvmType t
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let rt = type2LlvmType (snd e)
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vs <- exprToValue e
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lbl <- getNewLabel
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let label = GA.Ident $ "escape_" <> show lbl
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stackPtr <- getNewVar
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emit $ SetVariable stackPtr (Alloca ty)
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mapM_ (emitCases rt ty label stackPtr vs) cs
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emit $ Label label
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res <- getNewVar
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emit $ SetVariable res (Load ty Ptr stackPtr)
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where
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emitCases :: LLVMType -> LLVMType -> GA.Ident -> GA.Ident -> LLVMValue -> Branch -> CompilerState ()
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emitCases rt ty label stackPtr vs (Branch (MIR.PInj consId cs, t) exp) = do
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cons <- gets constructors
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let r = fromJust $ Map.lookup (coerce consId, t) cons
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lbl_failPos <- (\x -> GA.Ident $ "failed_" <> show x) <$> getNewLabel
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lbl_succPos <- (\x -> GA.Ident $ "success_" <> show x) <$> getNewLabel
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consVal <- getNewVar
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emit $ SetVariable consVal (ExtractValue rt vs 0)
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consCheck <- getNewVar
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emit $ SetVariable consCheck (Icmp LLEq I8 (VIdent consVal I8) (VInteger $ numCI r))
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emit $ BrCond (VIdent consCheck ty) lbl_succPos lbl_failPos
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emit $ Label lbl_succPos
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castPtr <- getNewVar
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castedPtr <- getNewVar
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casted <- getNewVar
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emit $ SetVariable castPtr (Alloca rt)
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emit $ Store rt vs Ptr castPtr
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emit $ SetVariable castedPtr (Bitcast Ptr (VIdent castPtr Ptr) Ptr)
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emit $ SetVariable casted (Load (CustomType (coerce consId)) Ptr castedPtr)
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val <- exprToValue exp
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-- enumerateOneM_
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-- (\i c -> do
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-- case c of
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-- CIdent x -> do
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-- emit . Comment $ "ident " <> show x
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-- emit $ SetVariable x (ExtractValue (CustomType (fst consId)) (VIdent casted Ptr) i)
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-- emit $ Store ty val Ptr stackPtr
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-- CCons x cs -> error "nested constructor"
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-- CLit l -> do
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-- testVar <- getNewVar
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-- emit $ SetVariable testVar (ExtractValue (CustomType (fst consId)) (VIdent casted Ptr) i)
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-- case l of
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-- LInt l -> emit $ Icmp LLEq I64 (VIdent testVar Ptr) (VInteger l)
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-- LChar c -> emit $ Icmp LLEq I8 (VIdent testVar Ptr) (VChar c)
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-- CCatch -> emit . Comment $ "Catch all"
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-- emit . Comment $ "return this " <> toIr val
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-- emit . Comment . show $ c
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-- emit . Comment . show $ i
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-- )
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-- cs
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-- emit $ Store ty val Ptr stackPtr
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emit $ Br label
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emit $ Label lbl_failPos
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emitCases rt ty label stackPtr vs (Branch (MIR.PLit i, _) exp) = do
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let i' = case i of
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(MIR.LInt i, _) -> VInteger i
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(MIR.LChar i, _) -> VChar i
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ns <- getNewVar
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lbl_failPos <- (\x -> GA.Ident $ "failed_" <> show x) <$> getNewLabel
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lbl_succPos <- (\x -> GA.Ident $ "success_" <> show x) <$> getNewLabel
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emit $ SetVariable ns (Icmp LLEq ty vs i')
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emit $ BrCond (VIdent ns ty) lbl_succPos lbl_failPos
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emit $ Label lbl_succPos
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val <- exprToValue exp
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emit $ Store ty val Ptr stackPtr
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emit $ Br label
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emit $ Label lbl_failPos
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-- emitCases rt ty label stackPtr vs (Injection (MIR.CIdent id) exp) = do
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-- -- //TODO this is pretty disgusting and would heavily benefit from a rewrite
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-- valPtr <- getNewVar
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-- emit $ SetVariable valPtr (Alloca rt)
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-- emit $ Store rt vs Ptr valPtr
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-- emit $ SetVariable id (Load rt Ptr valPtr)
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-- increaseVarCount
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-- val <- exprToValue (fst exp)
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-- emit $ Store ty val Ptr stackPtr
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-- emit $ Br label
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emitCases _ ty label stackPtr _ (Branch (MIR.PCatch, _) exp) = do
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val <- exprToValue exp
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emit $ Store ty val Ptr stackPtr
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emit $ Br label
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--emitLet :: Bind -> Exp -> CompilerState ()
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emitLet xs e = do
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emit $
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Comment $
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concat
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[ "ELet ("
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, show xs
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, " = "
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, show e
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, ") is not implemented!"
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]
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emitApp :: MIR.Type -> ExpT -> ExpT -> CompilerState ()
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emitApp t e1 e2 = appEmitter e1 e2 []
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where
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appEmitter :: ExpT -> ExpT -> [ExpT] -> CompilerState ()
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appEmitter e1 e2 stack = do
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let newStack = e2 : stack
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case e1 of
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(MIR.EApp e1' e2', t) -> appEmitter e1' e2' newStack
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(MIR.EId name, t) -> do
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args <- traverse exprToValue newStack
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vs <- getNewVar
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funcs <- gets functions
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consts <- gets constructors
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let visibility =
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fromMaybe Local $
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Global <$ Map.lookup (name, t) consts
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<|> Global <$ Map.lookup (name,t) funcs
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-- this piece of code could probably be improved, i.e remove the double `const Global`
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args' = map (first valueGetType . dupe) args
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call = Call FastCC (type2LlvmType t) visibility name args'
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emit $ SetVariable vs call
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x -> error $ "The unspeakable happened: " <> show x
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emitIdent :: GA.Ident -> CompilerState ()
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emitIdent id = do
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-- !!this should never happen!!
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emit $ Comment "This should not have happened!"
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emit $ Variable id
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emit $ UnsafeRaw "\n"
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|
emitLit :: MIR.Lit -> CompilerState ()
|
|
emitLit i = do
|
|
-- !!this should never happen!!
|
|
let (i', t) = case i of
|
|
(MIR.LInt i'') -> (VInteger i'', I64)
|
|
(MIR.LChar i'') -> (VChar i'', I8)
|
|
varCount <- getNewVar
|
|
emit $ Comment "This should not have happened!"
|
|
emit $ SetVariable (GA.Ident (show varCount)) (Add t i' (VInteger 0))
|
|
|
|
emitAdd :: MIR.Type -> ExpT -> ExpT -> CompilerState ()
|
|
emitAdd t e1 e2 = do
|
|
v1 <- exprToValue e1
|
|
v2 <- exprToValue e2
|
|
v <- getNewVar
|
|
emit $ SetVariable (GA.Ident $ show v) (Add (type2LlvmType t) v1 v2)
|
|
|
|
emitSub :: MIR.Type -> ExpT -> ExpT -> CompilerState ()
|
|
emitSub t e1 e2 = do
|
|
v1 <- exprToValue e1
|
|
v2 <- exprToValue e2
|
|
v <- getNewVar
|
|
emit $ SetVariable v (Sub (type2LlvmType t) v1 v2)
|
|
|
|
exprToValue :: ExpT -> CompilerState LLVMValue
|
|
exprToValue = \case
|
|
(MIR.ELit i, t) -> pure $ case i of
|
|
(MIR.LInt i) -> VInteger i
|
|
(MIR.LChar i) -> VChar i
|
|
(MIR.EId name, t) -> do
|
|
funcs <- gets functions
|
|
case Map.lookup (name, t) funcs of
|
|
Just fi -> do
|
|
if numArgs fi == 0
|
|
then do
|
|
vc <- getNewVar
|
|
emit $
|
|
SetVariable
|
|
vc
|
|
(Call FastCC (type2LlvmType t) Global name [])
|
|
pure $ VIdent vc (type2LlvmType t)
|
|
else pure $ VFunction name Global (type2LlvmType t)
|
|
Nothing -> pure $ VIdent name (type2LlvmType t)
|
|
e -> do
|
|
compileExp e
|
|
v <- getVarCount
|
|
pure $ VIdent (GA.Ident $ show v) (getType e)
|
|
|
|
type2LlvmType :: MIR.Type -> LLVMType
|
|
type2LlvmType (MIR.TLit id@(Ident name)) = case name of
|
|
"Int" -> I64
|
|
_ -> CustomType id
|
|
type2LlvmType (MIR.TFun t xs) = do
|
|
let (t', xs') = function2LLVMType xs [type2LlvmType t]
|
|
Function t' xs'
|
|
where
|
|
function2LLVMType :: Type -> [LLVMType] -> (LLVMType, [LLVMType])
|
|
function2LLVMType (TFun t xs) s = function2LLVMType xs (type2LlvmType t : s)
|
|
function2LLVMType x s = (type2LlvmType x, s)
|
|
|
|
getType :: ExpT -> LLVMType
|
|
getType (_, t) = type2LlvmType t
|
|
|
|
extractTypeName :: MIR.Type -> Ident
|
|
extractTypeName (MIR.TLit id) = id
|
|
extractTypeName (MIR.TFun t xs) = let (Ident i) = extractTypeName t
|
|
(Ident is) = extractTypeName xs
|
|
in Ident $ i <> "_$_" <> is
|
|
|
|
valueGetType :: LLVMValue -> LLVMType
|
|
valueGetType (VInteger _) = I64
|
|
valueGetType (VChar _) = I8
|
|
valueGetType (VIdent _ t) = t
|
|
valueGetType (VConstant s) = Array (fromIntegral $ length s) I8
|
|
valueGetType (VFunction _ _ t) = t
|
|
|
|
typeByteSize :: LLVMType -> Integer
|
|
typeByteSize I1 = 1
|
|
typeByteSize I8 = 1
|
|
typeByteSize I32 = 4
|
|
typeByteSize I64 = 8
|
|
typeByteSize Ptr = 8
|
|
typeByteSize (Ref _) = 8
|
|
typeByteSize (Function _ _) = 8
|
|
typeByteSize (Array n t) = n * typeByteSize t
|
|
typeByteSize (CustomType _) = 8
|
|
|
|
enumerateOneM_ :: Monad m => (Integer -> a -> m b) -> [a] -> m ()
|
|
enumerateOneM_ f = foldM_ (\i a -> f i a >> pure (i + 1)) 1
|