Stub the implementation for all phases

elna.cabal

@@ -37,8 +37,9 @@ library elna-internal
     exposed-modules:
         Language.Elna.Architecture.RiscV
         Language.Elna.AST
-        Language.Elna.CommandLine
         Language.Elna.CodeGenerator
+        Language.Elna.CommandLine
+        Language.Elna.PrinterWriter
         Language.Elna.Intermediate
         Language.Elna.Location
         Language.Elna.NameAnalysis

lib/Language/Elna/AST.hs

@@ -1,17 +1,19 @@
 module Language.Elna.AST
-    ( VariableAccess(..)
+    ( Program(..)
+    {-, VariableAccess(..)
     , Condition(..)
     , Declaration(..)
     , Expression(..)
     , Identifier(..)
     , Literal(..)
     , Parameter(..)
-    , Program(..)
     , Statement(..)
     , VariableDeclaration(..)
-    , TypeExpression(..)
+    , TypeExpression(..)-}
     ) where
 
+data Program = Program
+{-
 import Data.Int (Int32)
 import Data.List (intercalate)
 import Data.Word (Word16, Word32)
@@ -165,3 +167,4 @@ instance Show Program
 showParameters :: [Parameter] -> String
 showParameters parameters =
     "(" <> intercalate ", " (show <$> parameters) <> ")"
+-}

lib/Language/Elna/Architecture/RiscV.hs

@@ -136,6 +136,7 @@ data Type
     | R XRegister Funct3 XRegister XRegister Funct7
     | U XRegister Word32
     | J XRegister Word32
+    | Type XRegister Funct3 XRegister Funct12 -- Privileged.
 
 data Instruction = Instruction BaseOpcode Type
 
@@ -278,6 +279,11 @@ type' (J rd immediate)
      .|. ((immediate .&. 0x800) `shiftL` 9)
      .|. ((immediate .&. 0x7fe) `shiftL` 20)
      .|. ((immediate .&. 0x100000) `shiftL` 11);
+type' (Type rd funct3' rs1 funct12')
+    = (fromIntegral (xRegister rd) `shiftL` 7)
+    .|. (fromIntegral (funct3 funct3') `shiftL` 12)
+    .|. (fromIntegral (xRegister rs1) `shiftL` 15)
+    .|. (fromIntegral (funct12 funct12') `shiftL` 20);
 
 instruction :: Instruction -> ByteString.Builder.Builder
 instruction (Instruction base instructionType)

lib/Language/Elna/CodeGenerator.hs

@@ -1,3 +1,16 @@
 module Language.Elna.CodeGenerator
-    (
+    ( generateCode
     ) where
+
+import Data.Vector (Vector)
+import qualified Data.Vector as Vector
+import Language.Elna.Intermediate (Quadruple(..))
+import qualified Language.Elna.Architecture.RiscV as RiscV
+import Language.Elna.SymbolTable (SymbolTable)
+
+generateCode :: SymbolTable -> Vector Quadruple -> Vector RiscV.Instruction
+generateCode _ _ = Vector.fromList
+    [ RiscV.Instruction RiscV.OpImm $ RiscV.I RiscV.A0 RiscV.ADDI RiscV.Zero 0
+    , RiscV.Instruction RiscV.OpImm $ RiscV.I RiscV.A7 RiscV.ADDI RiscV.Zero 93
+    , RiscV.Instruction RiscV.System $ RiscV.Type RiscV.Zero RiscV.PRIV RiscV.Zero RiscV.ECALL
+    ]

lib/Language/Elna/Intermediate.hs

@@ -1,11 +1,28 @@
 module Language.Elna.Intermediate
-    ( Label(..)
+    ( Quadruple(..)
+    {- , Label(..)
     , Operand(..)
-    , Quadruple(..)
-    , Variable(..)
+    , Variable(..) -}
     , intermediate
     ) where
 
+import Data.Vector (Vector)
+import qualified Data.Vector as Vector
+import qualified Language.Elna.AST as AST
+import Language.Elna.SymbolTable (SymbolTable{-, Info(..) -})
+
+data Quadruple
+    = StartQuadruple
+    | StopQuadruple
+    deriving (Eq, Show)
+
+intermediate :: SymbolTable -> AST.Program -> {- HashMap AST.Identifier (-} Vector Quadruple --)
+intermediate _globalTable = const $ Vector.fromList [StartQuadruple, StopQuadruple]
+    {- = fst
+    . flip runState mempty
+    . runIntermediate
+    . program globalTable -}
+{-
 import Control.Monad.Trans.State (State, runState, gets, modify')
 import Data.Bifunctor (Bifunctor(..))
 import Data.Int (Int32)
@@ -13,11 +30,7 @@ import Data.HashMap.Strict (HashMap)
 import qualified Data.HashMap.Strict as HashMap
 import Data.Text (Text)
 import Data.Word (Word32)
-import Data.Vector (Vector)
-import qualified Data.Vector as Vector
-import qualified Language.Elna.AST as AST
 import Language.Elna.Types (Type(..))
-import Language.Elna.SymbolTable (SymbolTable, Info(..))
 import qualified Language.Elna.SymbolTable as SymbolTable
 import Data.Foldable (Foldable(..), foldrM)
 import GHC.Records (HasField(..))
@@ -129,13 +142,6 @@ createTemporary = do
         { temporaryCounter = getField @"temporaryCounter" generator + 1
         }
 
-intermediate :: SymbolTable -> AST.Program -> HashMap AST.Identifier (Vector Quadruple)
-intermediate globalTable
-    = fst
-    . flip runState mempty
-    . runIntermediate
-    . program globalTable
-
 program
     :: SymbolTable
     -> AST.Program
@@ -326,3 +332,4 @@ literal (AST.CharacterLiteral character) = IntOperand $ fromIntegral character
 literal (AST.BooleanLiteral boolean)
     | boolean = IntOperand 1
     | otherwise = IntOperand 0
+-}

lib/Language/Elna/NameAnalysis.hs

@@ -1,8 +1,22 @@
 module Language.Elna.NameAnalysis
-    ( Error(..)
-    , nameAnalysis
+    ( nameAnalysis
+    -- , Error(..)
     ) where
 
+import qualified Language.Elna.AST as AST
+import Language.Elna.SymbolTable
+    ( SymbolTable
+    , empty
+    --, Info(..)
+    -- , ParameterInfo(..)
+    )
+
+nameAnalysis :: AST.Program -> SymbolTable -- Either Error SymbolTable
+nameAnalysis = const empty {- runExcept
+    . flip runReaderT builtInSymbolTable
+    . runNameAnalysis
+    . program -}
+{-
 import Control.Monad.Trans.Except (Except, runExcept, throwE)
 import Control.Monad.Trans.Reader
     ( ReaderT(..)
@@ -12,14 +26,7 @@ import Control.Monad.Trans.Reader
     , withReaderT
     )
 import Data.Functor ((<&>))
-import qualified Language.Elna.AST as AST
 import Language.Elna.Location (Identifier(..))
-import Language.Elna.SymbolTable
-    ( Info(..)
-    , ParameterInfo(..)
-    , SymbolTable
-    , builtInSymbolTable
-    )
 import qualified Language.Elna.SymbolTable as SymbolTable
 import Language.Elna.Types (Type(..))
 import Control.Monad.Trans.Class (MonadTrans(..))
@@ -53,12 +60,6 @@ instance Monad NameAnalysis
   where
     (NameAnalysis x) >>= f = NameAnalysis $ x >>= (runNameAnalysis . f)
 
-nameAnalysis :: AST.Program -> Either Error SymbolTable
-nameAnalysis = runExcept
-    . flip runReaderT builtInSymbolTable
-    . runNameAnalysis
-    . program
-
 program :: AST.Program -> NameAnalysis SymbolTable
 program (AST.Program declarations)
     = NameAnalysis ask
@@ -206,3 +207,4 @@ dataType (AST.NamedType baseType) = do
         _ -> NameAnalysis $ lift $ throwE $ UndefinedTypeError baseType
 dataType (AST.ArrayType arraySize baseType) =
     dataType baseType <&> ArrayType arraySize
+-}

lib/Language/Elna/Object/Elf.hs

@@ -33,6 +33,7 @@ module Language.Elna.Object.Elf
     , elfHeaderSize
     , elfIdentification
     , elfObject
+    , elfSectionsSize
     , rInfo
     , stInfo
     ) where
@@ -469,11 +470,23 @@ instance Exception ElfEncodingError
 fromIntegralEnum :: (Enum a, Num b) => a -> b
 fromIntegralEnum = fromIntegral . fromEnum
 
+-- * Object file generation.
+
+-- | ELF header size.
 elfHeaderSize :: Elf32_Off
 elfHeaderSize = 52
 
+-- | Calculates the size of all sections based on the 'sh_size' in the given
+-- headers and adds 'elfHeaderSize' to it.
+elfSectionsSize :: Vector Elf32_Shdr -> Elf32_Off
+elfSectionsSize = (elfHeaderSize +)
+    . Vector.foldr ((+) . sh_size) 0
+
 -- Writes an ELF object with the given header to the provided file path.
 -- The callback writes the sections and returns headers for those sections.
+--
+-- It updates some of the header header according to the given headers and
+-- expects .shstrtab be the last header in the list.
 elfObject :: FilePath -> Elf32_Ehdr -> (Handle -> IO (Vector Elf32_Shdr)) -> IO ()
 elfObject outFile header putContents = withFile outFile WriteMode withObjectFile
   where
@@ -484,7 +497,9 @@ elfObject outFile header putContents = withFile outFile WriteMode withObjectFile
     afterContents objectHandle headers =
         let headerEncodingResult = elf32Ehdr
                 $ header
-                    { e_shoff = elfHeaderSize + Vector.foldr ((+) . sh_size) 0 headers
+                    { e_shoff = elfSectionsSize headers
+                    , e_shnum = fromIntegral $ Vector.length headers
+                    , e_shstrndx = fromIntegral (Vector.length headers) - 1
                     }
          in traverse_ (ByteString.Builder.hPutBuilder objectHandle . elf32Shdr LSB) headers
             >> either throwIO (putHeaders objectHandle) headerEncodingResult

lib/Language/Elna/Parser.hs

@@ -3,34 +3,34 @@ module Language.Elna.Parser
     , programP
     ) where
 
-import Control.Monad (void)
-import Control.Monad.Combinators.Expr (Operator(..), makeExprParser)
+-- import Control.Monad (void)
+-- import Control.Monad.Combinators.Expr (Operator(..), makeExprParser)
 import Data.Text (Text)
-import qualified Data.Text as Text
+-- import qualified Data.Text as Text
 import Data.Void (Void)
 import Language.Elna.AST
-    ( VariableAccess(..)
+    ( Program(..)
+    {-, VariableAccess(..)
     , Condition(..)
     , Declaration(..)
     , Expression(..)
     , Identifier(..)
     , Literal(..)
     , Parameter(..)
-    , Program(..)
     , Statement(..)
     , TypeExpression(..)
-    , VariableDeclaration(..)
+    , VariableDeclaration(..)-}
     )
 import Text.Megaparsec
     ( Parsec
-    , MonadParsec(..)
+    {-, MonadParsec(..)
     , (<?>)
     , optional
     , between
     , sepBy
-    , choice
+    , choice -}
     )
-import Text.Megaparsec.Char
+{- import Text.Megaparsec.Char
     ( alphaNumChar
     , char
     , letterChar
@@ -41,9 +41,9 @@ import qualified Text.Megaparsec.Char.Lexer as Lexer
 import Control.Applicative (Alternative(..))
 import Data.Maybe (isJust)
 import Data.Functor (($>))
-
+-}
 type Parser = Parsec Void Text
-
+{-
 space :: Parser ()
 space = Lexer.space space1 (Lexer.skipLineComment "//")
     $ Lexer.skipBlockComment "/*" "*/"
@@ -214,6 +214,6 @@ procedureDefinitionP = procedureCons
 
 declarationP :: Parser Declaration
 declarationP = typeDefinitionP <|> procedureDefinitionP
-
+-}
 programP :: Parser Program
-programP = Program <$> many declarationP
+programP = pure Program -- <$> many declarationP

lib/Language/Elna/PrinterWriter.hs

@@ -0,0 +1,172 @@
+-- | Writer assembler to an object file.
+module Language.Elna.PrinterWriter
+    ( riscv32Elf
+    , riscv32Header
+    ) where
+
+import Data.ByteString (ByteString)
+import qualified Data.ByteString as ByteString
+import qualified Data.ByteString.Builder as ByteString.Builder
+import qualified Data.ByteString.Lazy as LazyByteString
+import Data.Vector (Vector)
+import qualified Data.Vector as Vector
+import Language.Elna.Object.Elf
+    ( ByteOrder(..)
+    , Elf32_Ehdr(..)
+    , Elf32_Half
+    , Elf32_Sym(..)
+    , ElfMachine(..)
+    , ElfType(..)
+    , ElfVersion(..)
+    , ElfIdentification(..)
+    , ElfClass(..)
+    , ElfData(..)
+    , Elf32_Shdr(..)
+    , ElfSectionType(..)
+    , ElfSymbolBinding(..)
+    , ElfSymbolType(..)
+    , elf32Sym
+    , elfHeaderSize
+    , elfSectionsSize
+    , stInfo
+    )
+import System.IO (Handle)
+import qualified Language.Elna.Architecture.RiscV as RiscV
+
+data ElfHeaderResult a = ElfHeaderResult ByteString (Vector a)
+
+riscv32Elf :: Vector RiscV.Instruction -> Handle -> IO (Vector Elf32_Shdr)
+riscv32Elf code objectHandle =
+    let zeroHeader = Elf32_Shdr
+            { sh_type = SHT_NULL
+            , sh_size = 0
+            , sh_offset = 0
+            , sh_name = 0
+            , sh_link = 0
+            , sh_info = 0
+            , sh_flags = 0
+            , sh_entsize = 0
+            , sh_addralign = 0
+            , sh_addr = 0
+            }
+     in text (ElfHeaderResult "\0" $ Vector.singleton zeroHeader)
+        >>= shstrtab
+        >>= finalize
+  where
+    finalize (ElfHeaderResult _ headers) = pure headers
+    shstrtab (ElfHeaderResult names headers) = do
+        let stringTable = names <> ".shstrtab\0"
+            nextHeader = Elf32_Shdr
+                { sh_type = SHT_STRTAB
+                , sh_size = fromIntegral $ ByteString.length stringTable
+                , sh_offset = elfSectionsSize headers
+                , sh_name = fromIntegral $ ByteString.length names
+                , sh_link = 0
+                , sh_info = 0
+                , sh_flags = 0
+                , sh_entsize = 0
+                , sh_addralign = 0
+                , sh_addr = 0
+                }
+        ByteString.hPut objectHandle stringTable
+        pure $ ElfHeaderResult stringTable
+            $ Vector.snoc headers nextHeader
+    strtab stringTable (ElfHeaderResult names headers) = do
+        let newHeader = Elf32_Shdr
+                { sh_type = SHT_STRTAB
+                , sh_size = fromIntegral $ ByteString.length stringTable
+                , sh_offset = elfSectionsSize headers
+                , sh_name = fromIntegral $ ByteString.length names
+                , sh_link = 0
+                , sh_info = 0
+                , sh_flags = 0
+                , sh_entsize = 0
+                , sh_addralign = 0
+                , sh_addr = 0
+                }
+        ByteString.hPut objectHandle stringTable
+        pure $ ElfHeaderResult (names <> ".strtab\0")
+            $ Vector.snoc headers newHeader
+    symtab strtabIndex entries (ElfHeaderResult names headers) = do
+        let encoded = LazyByteString.toStrict
+                $ ByteString.Builder.toLazyByteString
+                $ foldMap (elf32Sym LSB) entries 
+            newHeader = Elf32_Shdr
+                { sh_type = SHT_SYMTAB
+                , sh_size = fromIntegral $ ByteString.length encoded
+                , sh_offset = elfSectionsSize headers
+                , sh_name = fromIntegral $ ByteString.length names
+                , sh_link = strtabIndex
+                , sh_info = 1
+                , sh_flags = 0
+                , sh_entsize = 16
+                , sh_addralign = 0
+                , sh_addr = 0
+                }
+        ByteString.hPut objectHandle encoded
+        pure $ ElfHeaderResult (names <> ".symtab\0")
+            $ Vector.snoc headers newHeader
+    text (ElfHeaderResult names headers) = do
+        let textTabIndex = fromIntegral $ Vector.length headers
+            strtabIndex = fromIntegral $ textTabIndex + 2
+        ElfHeaderResult stringTable  entries <- symbolEntry textTabIndex code
+            $ ElfHeaderResult "\0"
+            $ Vector.singleton
+            $ Elf32_Sym
+                { st_value = 0
+                , st_size = 0
+                , st_shndx = 0
+                , st_other = 0
+                , st_name = 0
+                , st_info = 0
+                }
+        let newHeader = Elf32_Shdr
+                { sh_type = SHT_PROGBITS
+                , sh_size = fromIntegral $ foldr ((+) . st_size) 0 entries
+                , sh_offset = elfSectionsSize headers
+                , sh_name = fromIntegral $ ByteString.length names
+                , sh_link = 0
+                , sh_info = 0
+                , sh_flags = 0b110
+                , sh_entsize = 0
+                , sh_addralign = 0
+                , sh_addr = 0
+                }
+            newResult = ElfHeaderResult (names <> ".text\0")
+                $ Vector.snoc headers newHeader
+        symtab strtabIndex entries newResult
+            >>= strtab stringTable
+    symbolEntry :: Elf32_Half -> Vector RiscV.Instruction -> ElfHeaderResult Elf32_Sym -> IO (ElfHeaderResult Elf32_Sym)
+    symbolEntry shndx instructions (ElfHeaderResult names entries) = do
+        let encoded = LazyByteString.toStrict
+                $ ByteString.Builder.toLazyByteString
+                $ foldMap RiscV.instruction instructions
+            newEntry = Elf32_Sym
+                { st_value = 0
+                , st_size = fromIntegral $ ByteString.length encoded
+                , st_shndx = shndx
+                , st_other = 0
+                , st_name = fromIntegral $ ByteString.length names
+                , st_info = stInfo STB_GLOBAL STT_FUNC
+                }
+        ByteString.hPut objectHandle encoded
+        pure $ ElfHeaderResult (names <> "_start\0")
+            $ Vector.snoc entries newEntry
+
+riscv32Header :: Elf32_Ehdr
+riscv32Header = Elf32_Ehdr
+    { e_version = EV_CURRENT
+    , e_type = ET_REL
+    , e_shstrndx = 2 -- String table. SHN_UNDEF
+    , e_shoff = 0
+    , e_shnum = 0
+    , e_shentsize = 40
+    , e_phoff = 0
+    , e_phnum = 0
+    , e_phentsize = 32
+    , e_machine = EM_RISCV
+    , e_ident = ElfIdentification ELFCLASS32 ELFDATA2LSB
+    , e_flags = 0x4 -- EF_RISCV_FLOAT_ABI_DOUBLE
+    , e_entry = 0
+    , e_ehsize = fromIntegral elfHeaderSize
+    }

lib/Language/Elna/SymbolTable.hs

@@ -1,15 +1,22 @@
 module Language.Elna.SymbolTable
-    ( Info(..)
-    , ParameterInfo(..)
-    , SymbolTable
-    , builtInSymbolTable
+    ( SymbolTable
     , empty
+    {-, Info(..)
+    , ParameterInfo(..)
+    , builtInSymbolTable
     , enter
     , fromList
     , lookup
-    , member
+    , member -}
     ) where
 
+data SymbolTable = SymbolTable -- (HashMap Identifier Info)
+    deriving (Eq, Show)
+
+empty :: SymbolTable
+empty = SymbolTable -- HashMap.empty
+
+{-
 import Data.HashMap.Strict (HashMap)
 import qualified Data.HashMap.Strict as HashMap
 import Data.List (sort)
@@ -20,9 +27,6 @@ import Language.Elna.Location (Identifier(..))
 import Language.Elna.Types (Type(..), intType, booleanType)
 import Prelude hiding (lookup)
 
-newtype SymbolTable = SymbolTable (HashMap Identifier Info)
-    deriving (Eq, Show)
-
 instance Semigroup SymbolTable
   where
     (SymbolTable lhs) <> (SymbolTable rhs) = SymbolTable $ rhs <> lhs
@@ -37,9 +41,6 @@ builtInSymbolTable = SymbolTable $ HashMap.fromList
     , ("int", TypeInfo intType)
     ]
 
-empty :: SymbolTable
-empty = SymbolTable HashMap.empty
-
 enter :: Identifier -> Info -> SymbolTable -> Maybe SymbolTable
 enter identifier info table@(SymbolTable hashTable)
     | member identifier table = Nothing
@@ -76,3 +77,4 @@ data Info
     | VariableInfo Bool Type
     | ProcedureInfo SymbolTable (Vector ParameterInfo)
     deriving (Eq, Show)
+-}

lib/Language/Elna/TypeAnalysis.hs

@@ -1,15 +1,24 @@
 module Language.Elna.TypeAnalysis
-    ( Error(..)
-    , typeAnalysis
+    ( typeAnalysis
+    , -- Error(..)
     ) where
 
+import qualified Language.Elna.AST as AST
+import Language.Elna.SymbolTable ({-Info(..), ParameterInfo(..), -}SymbolTable)
+
+typeAnalysis :: SymbolTable -> AST.Program -> () -- Maybe Error
+typeAnalysis _globalTable = const () {- either Just (const Nothing)
+    . runExcept
+    . flip runReaderT globalTable
+    . runTypeAnalysis
+    . program -}
+
+{-
 import Control.Applicative (Alternative(..))
 import Control.Monad.Trans.Except (Except, runExcept, throwE)
 import Control.Monad.Trans.Reader (ReaderT, asks, runReaderT, withReaderT, ask)
 import qualified Data.Vector as Vector
-import qualified Language.Elna.AST as AST
 import Language.Elna.Location (Identifier(..))
-import Language.Elna.SymbolTable (Info(..), ParameterInfo(..), SymbolTable)
 import qualified Language.Elna.SymbolTable as SymbolTable
 import Language.Elna.Types (Type(..), booleanType, intType)
 import Control.Monad.Trans.Class (MonadTrans(..))
@@ -48,13 +57,6 @@ instance Monad TypeAnalysis
   where
     (TypeAnalysis x) >>= f = TypeAnalysis $ x >>= (runTypeAnalysis . f)
 
-typeAnalysis :: SymbolTable -> AST.Program -> Maybe Error
-typeAnalysis globalTable = either Just (const Nothing)
-    . runExcept
-    . flip runReaderT globalTable
-    . runTypeAnalysis
-    . program
-
 program :: AST.Program -> TypeAnalysis ()
 program (AST.Program declarations) = traverse_ declaration declarations
 
@@ -181,3 +183,4 @@ literal (AST.IntegerLiteral _) = pure intType
 literal (AST.HexadecimalLiteral _) = pure intType
 literal (AST.CharacterLiteral _) = pure intType
 literal (AST.BooleanLiteral _) = pure booleanType
+-}

rakelib/tester.rake

@@ -46,7 +46,8 @@ namespace :test do
   file init => [root_directory] do |task|
     cp (TMP + 'tools/init'), task.name
   end
-  test_files << init << executable_directory << expectation_directory
+  # Directories should come first.
+  test_files.unshift executable_directory, expectation_directory, init
 
   file (TMP + 'riscv/root.cpio') => test_files do |task|
     root_files = task.prerequisites

src/Main.hs

@@ -3,78 +3,33 @@ module Main
     ) where
 
 import Language.Elna.CommandLine (CommandLine(..), commandLine, execParser)
-import Language.Elna.Object.Elf
-    ( Elf32_Ehdr(..)
-    , ElfMachine(..)
-    , ElfType(..)
-    , ElfVersion(..)
-    , ElfIdentification(..)
-    , ElfClass(..)
-    , ElfData(..)
-    , Elf32_Shdr(..)
-    , ElfSectionType(..)
-    , elfHeaderSize
-    , elfObject
-    )
-import qualified Data.ByteString as ByteString
-import Data.Vector (Vector)
-import qualified Data.Vector as Vector
+import Language.Elna.PrinterWriter (riscv32Elf, riscv32Header)
+import Language.Elna.Object.Elf (elfObject)
+import Language.Elna.Parser (programP)
+import Language.Elna.NameAnalysis (nameAnalysis)
+import Language.Elna.TypeAnalysis (typeAnalysis)
+import Language.Elna.Intermediate (intermediate)
+import Language.Elna.CodeGenerator (generateCode)
 import Data.Maybe (fromMaybe)
-import System.IO (Handle)
 import System.FilePath (replaceExtension, takeFileName)
-
-riscv32Elf :: Handle -> IO (Vector Elf32_Shdr)
-riscv32Elf objectHandle =
-    let stringTable = "\0shstrtab\0"
-        written = Vector.fromList
-            [ Elf32_Shdr
-                { sh_type = SHT_NULL
-                , sh_size = 0
-                , sh_offset = 0
-                , sh_name = 0
-                , sh_link = 0
-                , sh_info = 0
-                , sh_flags = 0
-                , sh_entsize = 0
-                , sh_addralign = 0
-                , sh_addr = 0
-                }
-            , Elf32_Shdr
-                { sh_type = SHT_STRTAB
-                , sh_size = fromIntegral $ ByteString.length stringTable
-                , sh_offset = fromIntegral elfHeaderSize
-                , sh_name = 1
-                , sh_link = 0
-                , sh_info = 0
-                , sh_flags = 0
-                , sh_entsize = 0
-                , sh_addralign = 0
-                , sh_addr = 0
-                }
-            ]
-        in ByteString.hPut objectHandle stringTable >> pure written
-
-riscv32Header :: Elf32_Ehdr
-riscv32Header = Elf32_Ehdr
-    { e_version = EV_CURRENT
-    , e_type = ET_REL
-    , e_shstrndx = 1 -- String table. SHN_UNDEF
-    , e_shoff = 0
-    , e_shnum = 2
-    , e_shentsize = 40
-    , e_phoff = 0
-    , e_phnum = 0
-    , e_phentsize = 32
-    , e_machine = EM_RISCV
-    , e_ident = ElfIdentification ELFCLASS32 ELFDATA2LSB
-    , e_flags = 0x4 -- EF_RISCV_FLOAT_ABI_DOUBLE
-    , e_entry = 0
-    , e_ehsize = fromIntegral elfHeaderSize
-    }
+import Text.Megaparsec (runParser, errorBundlePretty)
+import qualified Data.Text.IO as Text
 
 main :: IO ()
 main  = execParser commandLine >>= withCommandLine
   where
     withCommandLine CommandLine{..} =
-        let defaultOutput = replaceExtension (takeFileName input) "o"
-         in elfObject (fromMaybe defaultOutput output) riscv32Header riscv32Elf
+        let defaultOutput = flip fromMaybe output
+                $ replaceExtension (takeFileName input) "o"
+         in Text.readFile input
+            >>= withParsedInput defaultOutput
+            . runParser programP input
+    withParsedInput output (Right program) =
+        let symbolTable = nameAnalysis program
+            _ = typeAnalysis symbolTable program
+            intermediate' = intermediate symbolTable program
+         in elfObject output riscv32Header
+            $ riscv32Elf
+            $ generateCode symbolTable intermediate'
+    withParsedInput _ (Left errorBundle) = putStrLn
+        $ errorBundlePretty errorBundle