Find our JIT'ed function and run it

[kaleidoscope-hs.git] / Main.hs

diff --git a/Main.hs b/Main.hs
index 4dafa02b5f1acc3e2828c35a570993fba1abcfd0..48d93a224de17958d9f4586bc1aa079e43aee5c5 100644 (file)
--- a/Main.hs
+++ b/Main.hs
@@ -9,6 +9,7 @@ import Control.Monad.IO.Class
 import Data.String
 import qualified Data.Map as Map
 import qualified Data.Text.Lazy.IO as Text
+import Foreign.Ptr
 import LLVM.AST.AddrSpace
 import LLVM.AST.Constant
 import LLVM.AST.Float
@@ -18,6 +19,8 @@ import LLVM.AST.Type as Type
 import LLVM.Context
 import LLVM.IRBuilder
 import LLVM.Module
+import LLVM.OrcJIT
+import LLVM.OrcJIT.CompileLayer
 import LLVM.PassManager
 import LLVM.Pretty
 import LLVM.Target
@@ -25,13 +28,31 @@ import System.IO
 import System.IO.Error
 import Text.Read (readMaybe)
 
+foreign import ccall "dynamic" mkFun :: FunPtr (IO Double) -> IO Double
+
+data JITEnv = JITEnv
+  { jitEnvContext :: Context
+  , jitEnvCompileLayer :: IRCompileLayer ObjectLinkingLayer
+  , jitEnvModuleKey :: ModuleKey
+  }
+
 main :: IO ()
 main = do
   withContext $ \ctx -> withHostTargetMachine $ \tm -> do
-    ast <- runReaderT (buildModuleT "main" repl) ctx
+    withExecutionSession $ \exSession ->
+      withSymbolResolver exSession (SymbolResolver symResolver) $ \symResolverPtr ->
+        withObjectLinkingLayer exSession (const $ pure symResolverPtr) $ \linkingLayer ->
+          withIRCompileLayer linkingLayer tm $ \compLayer -> do
+            withModuleKey exSession $ \mdlKey -> do
+              let env = JITEnv ctx compLayer mdlKey
+              ast <- runReaderT (buildModuleT "main" repl) env
               return ()
 
-repl :: ModuleBuilderT (ReaderT Context IO) ()
+-- This can eventually be used to resolve external functions, e.g. a stdlib call
+symResolver :: MangledSymbol -> IO (Either JITSymbolError JITSymbol)
+symResolver sym = undefined
+
+repl :: ModuleBuilderT (ReaderT JITEnv IO) ()
 repl = do
   liftIO $ hPutStr stderr "ready> "
   mline <- liftIO $ catchIOError (Just <$> getLine) eofHandler
@@ -45,14 +66,14 @@ repl = do
           def <- mostRecentDef
           
           ast <- moduleSoFar "main"
-          ctx <- lift ask
+          ctx <- lift $ asks jitEnvContext
+          env <- lift ask
           liftIO $ withModuleFromAST ctx ast $ \mdl -> do
             Text.hPutStrLn stderr $ ppll def
             let spec = defaultCuratedPassSetSpec { optLevel = Just 3 }
             -- this returns true if the module was modified
             withPassManager spec $ flip runPassManager mdl
-            Text.hPutStrLn stderr . ("\n" <>) . ppllvm =<< moduleAST mdl
-            when anon (jit mdl >>= hPrint stderr)
+            when anon (jit env mdl >>= hPrint stderr)
 
           when anon (removeDef def)
       repl
@@ -63,8 +84,12 @@ repl = do
     isAnonExpr (ConstantOperand (GlobalReference _ "__anon_expr")) = True
     isAnonExpr _ = False
 
-jit :: Module -> IO Double
-jit _mdl = putStrLn "Working on it!" >> return 0
+jit :: JITEnv -> Module -> IO Double
+jit JITEnv{jitEnvCompileLayer=compLayer, jitEnvModuleKey=mdlKey} mdl =
+  withModule compLayer mdlKey mdl $ do
+    mangled <- mangleSymbol compLayer "__anon_expr"
+    Right (JITSymbol fPtr _) <- findSymbolIn compLayer mdlKey mangled False
+    mkFun (castPtrToFunPtr (wordPtrToPtr fPtr))
 
 type Binds = Map.Map String Operand