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{-# LANGUAGE TupleSections, GeneralizedNewtypeDeriving #-}
module Codegen(codegen) where
import Control.Monad.State.Strict
import Control.Monad.Except
import Data.Maybe
import qualified Data.Map.Strict as Map
import qualified LLVM.General.AST.Type as A
import qualified LLVM.General.AST.Global as A.G
import qualified LLVM.General.AST.Constant as A.C
-- import qualified LLVM.General.AST.Operand as A
-- import qualified LLVM.General.AST.Name as A
-- import qualified LLVM.General.AST.Instruction as A
import qualified LLVM.General.AST as A
import Debug.Trace
import AST
type Error a = Either String a
type LLName = String
data GenState
= GenState {currentBlock :: Maybe LLName
,allBlocks :: Map.Map LLName A.BasicBlock
,nextId :: Integer
,definitions :: [A.Definition]
,variables :: Map.Map LLName LLName}
deriving (Show)
initialGenState :: GenState
initialGenState
= GenState {currentBlock = Nothing
,allBlocks = Map.empty
,nextId = 1
,definitions = []
,variables = Map.empty}
newtype CGMonad a = CGMonad {unMon :: ExceptT String (State GenState) a}
deriving (Functor, Applicative, Monad, MonadState GenState, MonadError String)
runCGMonad :: CGMonad a -> Error (a, GenState)
runCGMonad m = let (e, s) = runState (runExceptT (unMon m)) initialGenState
in either Left (\x -> Right (x, s)) e
getUniqueId :: CGMonad Integer
getUniqueId = state $ \s -> (nextId s, s {nextId = nextId s + 1})
getNewName :: String -> CGMonad String
getNewName base = fmap ((base++) . show) getUniqueId
newBlock :: CGMonad LLName
newBlock = do
name <- getNewName "bb"
state $ \s -> (name, s {
currentBlock = Just name,
allBlocks = Map.insert name (A.BasicBlock (A.Name name) [] undefined) $ allBlocks s
})
newBlockJump :: LLName -> CGMonad LLName
newBlockJump next = do
bb <- newBlock
setTerminator $ A.Br (A.Name next) []
return bb
changeBlock :: LLName -> CGMonad ()
changeBlock name = state $ \s -> ((), s {currentBlock = Just name})
addInstr :: A.Instruction -> CGMonad LLName
addInstr instr = do
name <- getNewName "t"
addNamedInstr $ A.Name name A.:= instr
addNamedInstr :: A.Named A.Instruction -> CGMonad LLName
addNamedInstr instr@(A.Name name A.:= _) = do
let append (A.BasicBlock n il t) = A.BasicBlock n (il ++ [instr]) t
state $ \s -> (name, s {allBlocks = Map.adjust append (fromJust (currentBlock s)) (allBlocks s)})
addNamedInstr _ = undefined
addNamedInstrList :: [A.Named A.Instruction] -> CGMonad LLName
addNamedInstrList l = mapM addNamedInstr l >>= return . last
setTerminator :: A.Terminator -> CGMonad ()
setTerminator term = do
let replace (A.BasicBlock n il _) = A.BasicBlock n il (A.Do term)
state $ \s -> ((), s {allBlocks = Map.adjust replace (fromJust (currentBlock s)) (allBlocks s)})
setVarLabel :: LLName -> LLName -> CGMonad ()
setVarLabel name label = do
state $ \s -> ((), s {variables = Map.insert name label $ variables s})
lookupVar :: LLName -> CGMonad LLName
lookupVar name = liftM (fromJust . Map.lookup name . variables) get
namedName :: A.Named a -> LLName
namedName (A.Name name A.:= _) = name
namedName _ = undefined
codegen :: Program -- Program to compile
-> String -- Module name
-> String -- File name of source
-> Error A.Module
codegen prog name fname = do
(defs, st) <- runCGMonad $ do
defs <- generateDefs prog
return defs
traceShow st $ return ()
return $ A.defaultModule {
A.moduleName = name,
A.moduleSourceFileName = fname,
A.moduleDefinitions = defs
}
generateDefs :: Program -> CGMonad [A.Definition]
generateDefs prog = do
vardecls <- genGlobalVars prog
fundecls <- genFunctions prog
return $ vardecls ++ fundecls
genGlobalVars :: Program -> CGMonad [A.Definition]
genGlobalVars (Program decs) = mapM gen $ filter isDecVariable decs
where
gen :: Declaration -> CGMonad A.Definition
gen (DecVariable t n Nothing) = return $ A.GlobalDefinition $
A.globalVariableDefaults {
A.G.name = A.Name n,
A.G.type' = toLLVMType t,
A.G.initializer = Just $ initializerFor t
}
gen (DecVariable _ _ (Just _)) = throwError $ "Initialised global variables not supported yet"
gen _ = undefined
genFunctions :: Program -> CGMonad [A.Definition]
genFunctions (Program decs) = mapM gen $ filter isDecFunction decs
where
gen :: Declaration -> CGMonad A.Definition
gen (DecFunction rettype name args body) = do
firstbb <- genBlock' body
blockmap <- liftM allBlocks get
let bbs' = map snd $ filter (\x -> fst x /= firstbb) $ Map.toList blockmap
bbs = fromJust (Map.lookup firstbb blockmap) : bbs'
return $ A.GlobalDefinition $ A.functionDefaults {
A.G.returnType = toLLVMType rettype,
A.G.name = A.Name name,
A.G.parameters = ([A.Parameter (toLLVMType t) (A.Name n) [] | (t,n) <- args], False),
A.G.basicBlocks = bbs
}
gen _ = undefined
genBlock' :: Block -> CGMonad LLName
genBlock' bl = do
termbb <- newBlock
setTerminator $ A.Unreachable []
genBlock bl termbb
genBlock :: Block
-> LLName -- name of BasicBlock following this Block
-> CGMonad LLName -- name of first BasicBlock
genBlock (Block []) following = genBlock (Block [StEmpty]) following
genBlock (Block [stmt]) following = do
firstbb <- genSingle stmt following
return firstbb
genBlock (Block (stmt:rest)) following = do
restbb <- genBlock (Block rest) following
firstbb <- genSingle stmt restbb
return firstbb
genSingle :: Statement
-> LLName -- name of BasicBlock following this statement
-> CGMonad LLName -- name of first BasicBlock
genSingle StEmpty following = newBlockJump following
genSingle (StBlock block) following = genBlock block following
genSingle (StExpr expr) following = do
bb <- newBlockJump following
void $ genExpression expr >>= addNamedInstrList
return bb
genSingle (StVarDeclaration t n Nothing) following = do
bb <- newBlockJump following
label <- addInstr $ A.Alloca (toLLVMType t) Nothing 0 []
setVarLabel n label
return bb
genSingle (StVarDeclaration _ _ (Just _)) _ = undefined
genExpression :: Expression -> CGMonad [A.Named A.Instruction]
genExpression (ExLit (LitInt i) (Just t@(TypeInt sz))) = do
aname <- getNewName "t"
rname <- getNewName "t"
return [A.Name aname A.:= A.Alloca (toLLVMType t) Nothing 0 []
,A.Name rname A.:= A.Store False (A.LocalReference (toLLVMType t) (A.Name aname))
(A.ConstantOperand (A.C.Int (fromIntegral sz) i)) Nothing 0 []]
toLLVMType :: Type -> A.Type
toLLVMType (TypeInt s) = A.IntegerType $ fromIntegral s
toLLVMType (TypeUInt s) = A.IntegerType $ fromIntegral s
toLLVMType TypeFloat = A.float
toLLVMType TypeDouble = A.double
toLLVMType (TypePtr t) = A.ptr $ toLLVMType t
toLLVMType (TypeName _) = undefined
initializerFor :: Type -> A.C.Constant
initializerFor (TypeInt s) = A.C.Int (fromIntegral s) 0
initializerFor (TypeUInt s) = A.C.Int (fromIntegral s) 0
initializerFor _ = undefined
isDecVariable :: Declaration -> Bool
isDecVariable (DecVariable {}) = True
isDecVariable _ = False
isDecFunction :: Declaration -> Bool
isDecFunction (DecFunction {}) = True
isDecFunction _ = False
|
