X-Git-Url: https://git.lukelau.me/?p=kaleidoscope-hs-old.git;a=blobdiff_plain;f=Main.hs;h=eba1ce1c7ae6e8072b4e78862c2daf750280bdd4;hp=328aaf3c72c56d9b1d13f4f1de4376cf07b5681d;hb=e9d3bf0386f5654857fe6eaabe74ca651f9df76d;hpb=f250f7c0e621f1f94b6d2377f6a634314f306ace

diff --git a/Main.hs b/Main.hs
index 328aaf3..eba1ce1 100644
--- a/Main.hs
+++ b/Main.hs
@@ -26,8 +26,6 @@ import LLVM.AST.Type as Type
 import LLVM.AST.Typed
 import LLVM.Pretty
 
-import Debug.Trace
-
 type ModuleBuilderE = ModuleBuilderT (Either String)
 
 foreign import ccall "dynamic" exprFun :: FunPtr (IO Float) -> IO Float
@@ -52,6 +50,22 @@ main = do
               let f' = castFunPtr f :: FunPtr (IO Float)
               exprFun f' >>= print
 
+evalProg :: AST.Program -> IO (Maybe Float)
+evalProg (AST.Program asts) = do
+  let eitherMdl = buildModuleT "main" $ mapM buildAST asts
+  case eitherMdl of
+    Left _ -> return Nothing
+    Right mdl -> withContext $ \ctx ->
+      withMCJIT ctx Nothing Nothing Nothing Nothing $ \mcjit ->
+        withModuleFromAST ctx mdl $ \mdl' ->
+          withModuleInEngine mcjit mdl' $ \emdl -> do
+            Just f <- getFunction emdl "expr"
+            let f' = castFunPtr f :: FunPtr (IO Float)
+            Just <$> exprFun f'
+
+-- | Builds up programs at the top-level of an LLVM Module
+-- >>> evalProg (read "31 - 5")
+-- Just 26.0
 buildAST :: AST.AST -> ModuleBuilderE Operand
 buildAST (AST.Function nameStr paramStrs body) = do
   let n = fromString nameStr
@@ -62,6 +76,11 @@ buildAST (AST.Function nameStr paramStrs body) = do
 buildAST (AST.Eval e) =
   function "expr" [] float $ \_ -> buildExpr mempty e >>= ret
 
+-- | Builds up expressions, which are operands in LLVM IR
+-- >>> evalProg (read "def foo(x) x * 2; foo(6)")
+-- Just 12.0
+-- >>> evalProg (read "if 3 > 2 then 42 else 12")
+-- Just 42.0
 buildExpr :: Map.Map String Operand -> AST.Expr -> IRBuilderT ModuleBuilderE Operand
 buildExpr _ (AST.Num a) = pure $ ConstantOperand (Float (Single a))
 buildExpr binds (AST.Var n) = case binds Map.!? n of
@@ -105,4 +124,4 @@ buildExpr binds (AST.If cond thenE elseE) = mdo
   br mergeB
 
   mergeB <- block `named` "ifcont"
-  traceShowId <$> phi [(thenOp, thenB), (elseOp, elseB)]
+  phi [(thenOp, thenB), (elseOp, elseB)]