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
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
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
br mergeB
mergeB <- block `named` "ifcont"
- traceShowId <$> phi [(thenOp, thenB), (elseOp, elseB)]
+ phi [(thenOp, thenB), (elseOp, elseB)]