Generate code for functions and variables

[kaleidoscope-hs.git] / Main.hs

diff --git a/Main.hs b/Main.hs
index ca6629ab447cd64b7c8748eec07ffa7fe6b34e9d..2eae262967be844fff1886ac2d34318912b17e53 100644 (file)
--- a/Main.hs
+++ b/Main.hs
@@ -2,7 +2,10 @@
 
 import AST as K -- K for Kaleidoscope
 import Utils
+import Control.Monad.Trans.Reader
 import Control.Monad.IO.Class
+import Data.String
+import qualified Data.Map as Map
 import qualified Data.Text.Lazy.IO as Text
 import LLVM.AST.Constant
 import LLVM.AST.Float
@@ -28,12 +31,27 @@ repl = do
   repl
   where 
 
+type Binds = Map.Map String Operand
+
 buildAST :: AST -> ModuleBuilder Operand
+buildAST (Function (Prototype nameStr paramStrs) body) = do
+  let n = fromString nameStr
+  function n params Type.double $ \ops -> do
+    let binds = Map.fromList (zip paramStrs ops)
+    flip runReaderT binds $ buildExpr body >>= ret
+  where params = zip (repeat Type.double) (map fromString paramStrs)
+
 buildAST (TopLevelExpr x) = function "__anon_expr" [] Type.double $
-  const $ buildExpr x >>= ret
+  const $ flip runReaderT mempty $ buildExpr x >>= ret
 
-buildExpr :: Expr -> IRBuilderT ModuleBuilder Operand
+buildExpr :: Expr -> ReaderT Binds (IRBuilderT ModuleBuilder) Operand
 buildExpr (Num x) = pure $ ConstantOperand (Float (Double x))
+buildExpr (Var n) = do
+  binds <- ask
+  case binds Map.!? n of
+    Just x -> pure x
+    Nothing -> error $ "'" <> n <> "' doesn't exist in scope"
+
 buildExpr (BinOp op a b) = do
   opA <- buildExpr a
   opB <- buildExpr b