Add initial typechecker for AST #2
@ -92,7 +92,7 @@ methodDescriptor (MethodDeclaration returntype _ parameters _) = let
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"("
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++ (concat (map methodParameterDescriptor parameter_types))
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++ ")"
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++ datatypeDescriptor returntype
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++ methodParameterDescriptor returntype
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classBuilder :: ClassFileBuilder Class
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@ -160,11 +160,12 @@ methodBuilder (MethodDeclaration returntype name parameters statement) input = l
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memberDescriptorIndex = (fromIntegral (baseIndex + 1)),
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memberAttributes = []
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}
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in
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in
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input {
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constantPool = (constantPool input) ++ constants,
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methods = (methods input) ++ [method]
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}
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methodAssembler :: ClassFileBuilder MethodDeclaration
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@ -174,8 +175,9 @@ methodAssembler (MethodDeclaration returntype name parameters statement) input =
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Nothing -> error ("Cannot find method entry in method pool for method: " ++ name)
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Just index -> let
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declaration = MethodDeclaration returntype name parameters statement
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paramNames = "this" : [name | ParameterDeclaration _ name <- parameters]
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(pre, method : post) = splitAt index (methods input)
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(_, bytecode) = assembleMethod (constantPool input, []) declaration
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(_, bytecode, _) = assembleMethod (constantPool input, [], paramNames) declaration
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assembledMethod = method {
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memberAttributes = [
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CodeAttribute {
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@ -193,7 +195,7 @@ methodAssembler (MethodDeclaration returntype name parameters statement) input =
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type Assembler a = ([ConstantInfo], [Operation]) -> a -> ([ConstantInfo], [Operation])
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type Assembler a = ([ConstantInfo], [Operation], [String]) -> a -> ([ConstantInfo], [Operation], [String])
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returnOperation :: DataType -> Operation
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returnOperation dtype
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@ -219,78 +221,93 @@ comparisonOperation CompareGreaterOrEqual branchLocation = Opif_icmpge branchLoc
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assembleMethod :: Assembler MethodDeclaration
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assembleMethod (constants, ops) (MethodDeclaration _ name _ (TypedStatement _ (Block statements)))
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assembleMethod (constants, ops, lvars) (MethodDeclaration _ name _ (TypedStatement _ (Block statements)))
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| name == "<init>" = let
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(constants_a, ops_a) = foldl assembleStatement (constants, ops) statements
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(constants_a, ops_a, lvars_a) = foldl assembleStatement (constants, ops, lvars) statements
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init_ops = [Opaload 0, Opinvokespecial 2]
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in
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(constants_a, init_ops ++ ops_a ++ [Opreturn])
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(constants_a, init_ops ++ ops_a ++ [Opreturn], lvars_a)
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| otherwise = let
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(constants_a, ops_a) = foldl assembleStatement (constants, ops) statements
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(constants_a, ops_a, lvars_a) = foldl assembleStatement (constants, ops, lvars) statements
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init_ops = [Opaload 0]
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in
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(constants_a, init_ops ++ ops_a)
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(constants_a, init_ops ++ ops_a, lvars_a)
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assembleMethod _ (MethodDeclaration _ _ _ stmt) = error ("Block expected for method body, got: " ++ show stmt)
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assembleStatement :: Assembler Statement
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assembleStatement (constants, ops) (TypedStatement stype (Return expr)) = case expr of
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Nothing -> (constants, ops ++ [Opreturn])
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assembleStatement (constants, ops, lvars) (TypedStatement stype (Return expr)) = case expr of
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Nothing -> (constants, ops ++ [Opreturn], lvars)
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Just expr -> let
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(expr_constants, expr_ops) = assembleExpression (constants, ops) expr
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(expr_constants, expr_ops, _) = assembleExpression (constants, ops, lvars) expr
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in
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(expr_constants, expr_ops ++ [returnOperation stype])
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assembleStatement (constants, ops) (TypedStatement _ (Block statements)) =
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foldl assembleStatement (constants, ops) statements
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assembleStatement (constants, ops) (TypedStatement _ (If expr if_stmt else_stmt)) = let
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(constants_cmp, ops_cmp) = assembleExpression (constants, []) expr
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(constants_ifa, ops_ifa) = assembleStatement (constants_cmp, []) if_stmt
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(constants_elsea, ops_elsea) = case else_stmt of
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Nothing -> (constants_ifa, [])
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Just stmt -> assembleStatement (constants_ifa, []) stmt
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(expr_constants, expr_ops ++ [returnOperation stype], lvars)
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assembleStatement (constants, ops, lvars) (TypedStatement _ (Block statements)) =
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foldl assembleStatement (constants, ops, lvars) statements
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assembleStatement (constants, ops, lvars) (TypedStatement _ (If expr if_stmt else_stmt)) = let
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(constants_cmp, ops_cmp, _) = assembleExpression (constants, [], lvars) expr
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(constants_ifa, ops_ifa, _) = assembleStatement (constants_cmp, [], lvars) if_stmt
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(constants_elsea, ops_elsea, _) = case else_stmt of
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Nothing -> (constants_ifa, [], lvars)
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Just stmt -> assembleStatement (constants_ifa, [], lvars) stmt
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-- +6 because we insert 2 gotos, one for if, one for else
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if_length = sum (map opcodeEncodingLength ops_ifa) + 6
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-- +3 because we need to account for the goto in the if statement.
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else_length = sum (map opcodeEncodingLength ops_elsea) + 3
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in
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(constants_ifa, ops ++ ops_cmp ++ [Opsipush 0, Opif_icmpeq if_length] ++ ops_ifa ++ [Opgoto else_length] ++ ops_elsea)
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assembleStatement stmt _ = error ("Not yet implemented: " ++ show stmt)
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(constants_ifa, ops ++ ops_cmp ++ [Opsipush 0, Opif_icmpeq if_length] ++ ops_ifa ++ [Opgoto else_length] ++ ops_elsea, lvars)
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assembleStatement (constants, ops, lvars) (TypedStatement _ (LocalVariableDeclaration (VariableDeclaration dtype name expr))) = let
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isPrimitive = elem dtype ["char", "boolean", "int"]
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(constants_init, ops_init, _) = case expr of
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Just exp -> assembleExpression (constants, ops, lvars) exp
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Nothing -> (constants, ops ++ if isPrimitive then [Opsipush 0] else [Opaconst_null], lvars)
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localIndex = fromIntegral (length lvars)
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loadLocal = if isPrimitive then [Opistore localIndex] else [Opastore localIndex]
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in
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(constants_init, ops_init ++ loadLocal, lvars ++ [name])
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assembleStatement _ stmt = error ("Not yet implemented: " ++ show stmt)
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assembleExpression :: Assembler Expression
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assembleExpression (constants, ops) (TypedExpression _ (BinaryOperation op a b))
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assembleExpression (constants, ops, lvars) (TypedExpression _ (BinaryOperation op a b))
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| elem op [Addition, Subtraction, Multiplication, Division, BitwiseAnd, BitwiseOr, BitwiseXor] = let
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(aConstants, aOps) = assembleExpression (constants, ops) a
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(bConstants, bOps) = assembleExpression (aConstants, aOps) b
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(aConstants, aOps, _) = assembleExpression (constants, ops, lvars) a
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(bConstants, bOps, _) = assembleExpression (aConstants, aOps, lvars) b
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in
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(bConstants, bOps ++ [binaryOperation op])
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(bConstants, bOps ++ [binaryOperation op], lvars)
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| elem op [CompareEqual, CompareNotEqual, CompareLessThan, CompareLessOrEqual, CompareGreaterThan, CompareGreaterOrEqual] = let
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(aConstants, aOps) = assembleExpression (constants, ops) a
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(bConstants, bOps) = assembleExpression (aConstants, aOps) b
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(aConstants, aOps, _) = assembleExpression (constants, ops, lvars) a
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(bConstants, bOps, _) = assembleExpression (aConstants, aOps, lvars) b
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cmp_op = comparisonOperation op 9
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cmp_ops = [cmp_op, Opsipush 0, Opgoto 6, Opsipush 1]
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in
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(bConstants, bOps ++ cmp_ops)
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assembleExpression (constants, ops) (TypedExpression _ (CharacterLiteral literal)) =
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(constants, ops ++ [Opsipush (fromIntegral (ord literal))])
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assembleExpression (constants, ops) (TypedExpression _ (BooleanLiteral literal)) =
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(constants, ops ++ [Opsipush (if literal then 1 else 0)])
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assembleExpression (constants, ops) (TypedExpression _ (IntegerLiteral literal))
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| literal <= 32767 && literal >= -32768 = (constants, ops ++ [Opsipush (fromIntegral literal)])
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| otherwise = (constants ++ [IntegerInfo (fromIntegral literal)], ops ++ [Opldc_w (fromIntegral (1 + length constants))])
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assembleExpression (constants, ops) (TypedExpression _ NullLiteral) =
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(constants, ops ++ [Opaconst_null])
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assembleExpression (constants, ops) (TypedExpression etype (UnaryOperation Not expr)) = let
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(exprConstants, exprOps) = assembleExpression (constants, ops) expr
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(bConstants, bOps ++ cmp_ops, lvars)
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assembleExpression (constants, ops, lvars) (TypedExpression _ (CharacterLiteral literal)) =
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(constants, ops ++ [Opsipush (fromIntegral (ord literal))], lvars)
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assembleExpression (constants, ops, lvars) (TypedExpression _ (BooleanLiteral literal)) =
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(constants, ops ++ [Opsipush (if literal then 1 else 0)], lvars)
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assembleExpression (constants, ops, lvars) (TypedExpression _ (IntegerLiteral literal))
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| literal <= 32767 && literal >= -32768 = (constants, ops ++ [Opsipush (fromIntegral literal)], lvars)
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| otherwise = (constants ++ [IntegerInfo (fromIntegral literal)], ops ++ [Opldc_w (fromIntegral (1 + length constants))], lvars)
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assembleExpression (constants, ops, lvars) (TypedExpression _ NullLiteral) =
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(constants, ops ++ [Opaconst_null], lvars)
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assembleExpression (constants, ops, lvars) (TypedExpression etype (UnaryOperation Not expr)) = let
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(exprConstants, exprOps, _) = assembleExpression (constants, ops, lvars) expr
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newConstant = fromIntegral (1 + length exprConstants)
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in case etype of
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"int" -> (exprConstants ++ [IntegerInfo 0x7FFFFFFF], exprOps ++ [Opldc_w newConstant, Opixor])
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"char" -> (exprConstants, exprOps ++ [Opsipush 0xFFFF, Opixor])
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"boolean" -> (exprConstants, exprOps ++ [Opsipush 0x01, Opixor])
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assembleExpression (constants, ops) (TypedExpression _ (UnaryOperation Minus expr)) = let
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(exprConstants, exprOps) = assembleExpression (constants, ops) expr
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"int" -> (exprConstants ++ [IntegerInfo 0x7FFFFFFF], exprOps ++ [Opldc_w newConstant, Opixor], lvars)
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"char" -> (exprConstants, exprOps ++ [Opsipush 0xFFFF, Opixor], lvars)
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"boolean" -> (exprConstants, exprOps ++ [Opsipush 0x01, Opixor], lvars)
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assembleExpression (constants, ops, lvars) (TypedExpression _ (UnaryOperation Minus expr)) = let
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(exprConstants, exprOps, _) = assembleExpression (constants, ops, lvars) expr
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in
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(exprConstants, exprOps ++ [Opineg])
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assembleExpression (constants, ops) (TypedExpression _ (FieldVariable name)) = let
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(exprConstants, exprOps ++ [Opineg], lvars)
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assembleExpression (constants, ops, lvars) (TypedExpression _ (FieldVariable name)) = let
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fieldIndex = findFieldIndex constants name
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in case fieldIndex of
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Just index -> (constants, ops ++ [Opaload 0, Opgetfield (fromIntegral index)])
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Just index -> (constants, ops ++ [Opaload 0, Opgetfield (fromIntegral index)], lvars)
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Nothing -> error ("No such field found in constant pool: " ++ name)
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assembleExpression (constants, ops, lvars) (TypedExpression _ (LocalVariable name)) = let
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localIndex = findIndex ((==) name) lvars
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in case localIndex of
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Just index -> (constants, ops ++ [Opiload (fromIntegral index)], lvars)
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Nothing -> error ("No such local variable found in local variable pool: " ++ name)
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assembleExpression _ expr = error ("unimplemented: " ++ show expr)
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Reference in New Issue
Block a user