{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE RecursiveDo #-}
import AST as K -- K for Kaleidoscope
import Utils
ptrTyp = Type.PointerType typ (AddrSpace 0)
ref = GlobalReference ptrTyp nam
call (ConstantOperand ref) (zip paramOps (repeat []))
+
+buildExpr (If cond thenE elseE) = mdo
+ _ifB <- block `named` "if"
+
+ -- since everything is a double, false == 0
+ let zero = ConstantOperand (Float (Double 0))
+ condV <- buildExpr cond
+ cmp <- fcmp ONE zero condV `named` "cmp"
+
+ condBr cmp thenB elseB
+
+ thenB <- block `named` "then"
+ thenOp <- buildExpr thenE
+ br mergeB
+
+ elseB <- block `named` "else"
+ elseOp <- buildExpr elseE
+ br mergeB
+
+ mergeB <- block `named` "ifcont"
+ phi [(thenOp, thenB), (elseOp, elseB)]
+
+buildExpr (For name init cond mStep body) = mdo
+ preheaderB <- block `named` "preheader"
+
+ initV <- buildExpr init `named` "init"
+
+ -- build the condition expression with 'i' in the bindings
+ initCondV <- withReaderT (Map.insert name initV) $
+ (buildExpr cond >>= fcmp ONE zero) `named` "initcond"
+
+ -- skip the loop if we don't meet the condition with the init
+ condBr initCondV loopB afterB
+
+ loopB <- block `named` "loop"
+ i <- phi [(initV, preheaderB), (nextVar, loopB)] `named` "i"
+
+ -- build the body expression with 'i' in the bindings
+ withReaderT (Map.insert name i) $ buildExpr body `named` "body"
+
+ -- default to 1 if there's no step defined
+ stepV <- case mStep of
+ Just step -> buildExpr step
+ Nothing -> return $ ConstantOperand (Float (Double 1))
+
+ nextVar <- fadd i stepV `named` "nextvar"
+
+ let zero = ConstantOperand (Float (Double 0))
+ -- again we need 'i' in the bindings
+ condV <- withReaderT (Map.insert name i) $
+ (buildExpr cond >>= fcmp ONE zero) `named` "cond"
+ condBr condV loopB afterB
+
+ afterB <- block `named` "after"
+ -- since a for loop doesn't really have a value, return 0
+ return $ ConstantOperand (Float (Double 0))
+