Make IR for array access

lib/Language/Elna/Backend/Allocator.hs

@@ -139,6 +139,10 @@ quadruple = \case
         operand1' <- operand operand1
         operand2' <- operand operand2
         ArrayAssignQuadruple operand1' operand2' <$> storeVariable variable
+    ArrayQuadruple variable1 operand1 variable2 -> ArrayQuadruple 
+        <$> storeVariable variable1
+        <*> operand operand1
+        <*> storeVariable variable2
 
 operand :: Operand Variable -> Allocator r (Operand (Store r))
 operand (IntOperand x) = pure $ IntOperand x

lib/Language/Elna/Backend/Intermediate.hs

@@ -50,7 +50,7 @@ data Quadruple v
     | DivisionQuadruple (Operand v) (Operand v) v
     | GoToQuadruple Label
     | AssignQuadruple (Operand v) v
-    {-| ArrayQuadruple Variable Operand Variable -}
+    | ArrayQuadruple v (Operand v) v
     | ArrayAssignQuadruple (Operand v) (Operand v) v
     | LessOrEqualQuadruple (Operand v) (Operand v) Label
     | GreaterOrEqualQuadruple (Operand v) (Operand v) Label

lib/Language/Elna/Glue.hs

@@ -26,6 +26,7 @@ import Language.Elna.Frontend.SymbolTable (Info(..), SymbolTable)
 import qualified Language.Elna.Frontend.SymbolTable as SymbolTable
 import GHC.Records (HasField(..))
 import Language.Elna.Frontend.AST (Identifier(..))
+import Debug.Trace (traceShow)
 
 data Paste = Paste
     { temporaryCounter :: Word32
@@ -71,11 +72,12 @@ declaration
     :: SymbolTable
     -> AST.Declaration
     -> Glue (Maybe (AST.Identifier, Vector (Quadruple Variable)))
-declaration globalTable (AST.ProcedureDeclaration procedureName parameters variableDeclarations statements)
-    = Glue (modify' resetTemporaryCounter)
-    >> traverseWithIndex registerVariable variableDeclarations
-    >> traverseWithIndex registerParameter (reverse parameters)
-    >> nameQuadruplesTuple <$> traverse (statement globalTable) statements
+declaration globalTable (AST.ProcedureDeclaration procedureName parameters variableDeclarations statements) =
+    let Just (ProcedureInfo localTable _) = SymbolTable.lookup procedureName globalTable
+     in Glue (modify' resetTemporaryCounter)
+        >> traverseWithIndex registerVariable variableDeclarations
+        >> traverseWithIndex registerParameter (reverse parameters)
+        >> nameQuadruplesTuple <$> traverse (statement localTable) statements
   where
     traverseWithIndex f = traverse_ (uncurry f) . zip [0..]
     registerParameter index (AST.Parameter identifier _ _) =
@@ -251,7 +253,8 @@ variableAccess _ _ _ _ _ = error "Array access operator doesn't match the type."
 variableType :: AST.VariableAccess -> SymbolTable -> Type
 variableType (AST.VariableAccess identifier) symbolTable
     | Just (TypeInfo type') <- SymbolTable.lookup identifier symbolTable = type'
-    | otherwise = error "Undefined type."
+    | Just (VariableInfo _ type') <- SymbolTable.lookup identifier symbolTable = type'
+    | otherwise = traceShow identifier $ error "Undefined type."
 variableType (AST.ArrayAccess arrayAccess' _) symbolTable =
     variableType arrayAccess' symbolTable
 

lib/Language/Elna/RiscV/CodeGenerator.hs

@@ -295,6 +295,38 @@ quadruple _ (ArrayAssignQuadruple assigneeOperand indexOperand store)
                 , storeInstruction
                 ]
         in (register, indexStatements <> statements)
+quadruple _ (ArrayQuadruple assigneeVariable indexOperand store) =
+    let (operandRegister1, statements1) = loadWithOffset assigneeVariable indexOperand
+        (storeRegister, storeStatements) = storeToStore store
+        instruction = Instruction
+            $ RiscV.BaseInstruction RiscV.OpImm
+            $ RiscV.I storeRegister RiscV.ADDI operandRegister1 0
+     in pure $ statements1 <> Vector.cons instruction storeStatements 
+  where
+    loadWithOffset :: RiscVStore -> Operand RiscVStore -> (RiscV.XRegister, Vector Statement)
+    loadWithOffset (RegisterStore register) _ = (register, mempty)
+    loadWithOffset (StackStore offset register) (IntOperand indexOffset) =
+        let loadInstruction = Instruction
+                $ RiscV.BaseInstruction RiscV.Load
+                $ RiscV.I register RiscV.LW RiscV.S0 (fromIntegral $ offset + indexOffset)
+        in (register, Vector.singleton loadInstruction)
+    loadWithOffset (StackStore offset register) (VariableOperand indexOffset) =
+        let baseRegisterInstruction = Instruction
+                $ RiscV.BaseInstruction RiscV.OpImm
+                $ RiscV.I immediateRegister RiscV.ADDI RiscV.S0 0
+            (indexRegister, indexStatements) = loadFromStore indexOffset
+            registerWithOffset = Instruction
+                $ RiscV.BaseInstruction RiscV.OpImm
+                $ RiscV.I immediateRegister RiscV.ADDI indexRegister 0
+            loadInstruction = Instruction
+                $ RiscV.BaseInstruction RiscV.Load
+                $ RiscV.I register RiscV.SW immediateRegister (fromIntegral offset)
+            statements = Vector.fromList
+                [ baseRegisterInstruction
+                , registerWithOffset
+                , loadInstruction
+                ]
+        in (register, indexStatements <> statements)
 
 unconditionalJal :: Label -> Statement
 unconditionalJal (Label goToLabel) = Instruction

tests/expectations/array_element_assignment.txt

@@ -0,0 +1 @@
+5

tests/expectations/print_array_element.txt

@@ -0,0 +1,2 @@
+5
+7

tests/vm/array_element_assignment.elna

@@ -1,3 +1,6 @@
 proc main() {
   var a: array[1] of int;
+  a[0] := 5;
+
+  printi(a[0]);
 }

tests/vm/print_array_element.elna

@@ -0,0 +1,8 @@
+proc main() {
+  var a: array[2] of int;
+  a[0] := 5;
+  a[1] := 7;
+
+  printi(a[0]);
+  printi(a[1]);
+}