restructured bytecode code
This commit is contained in:
mrab
parent
ddab04f063
commit
d0d2cbd081
@ -12,18 +12,23 @@ executable compiler
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utf8-string,
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bytestring
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default-language: Haskell2010
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hs-source-dirs: src,
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src/ByteCode,
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src/ByteCode/ClassFile
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hs-source-dirs: src
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build-tool-depends: alex:alex, happy:happy
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other-modules: Parser.Lexer,
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Parser.JavaParser
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Parser.JavaParser,
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Ast,
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Example,
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Typecheck,
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ByteCode.ByteUtil,
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ByteCode.ClassFile,
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ByteCode.ClassFile.Generator,
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ByteCode.Generation.Generator,
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ByteCode.Generation.Assembler.Expression,
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ByteCode.Generation.Assembler.Method,
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ByteCode.Generation.Assembler.Statement,
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ByteCode.Generation.Assembler.StatementExpression,
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ByteCode.Generation.Builder.Class,
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ByteCode.Generation.Builder.Field,
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ByteCode.Generation.Builder.Method,
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ByteCode.Constants
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test-suite tests
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@ -1,340 +0,0 @@
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module ByteCode.ClassFile.Generator(
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classBuilder,
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datatypeDescriptor,
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methodParameterDescriptor,
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methodDescriptor,
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memberInfoIsMethod,
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memberInfoName,
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memberInfoDescriptor,
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findMethodIndex
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) where
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import ByteCode.Constants
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import ByteCode.ClassFile (ClassFile (..), ConstantInfo (..), MemberInfo(..), Operation(..), Attribute(..), opcodeEncodingLength)
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import Ast
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import Data.Char
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import Data.List
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import Data.Word
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type ClassFileBuilder a = a -> ClassFile -> ClassFile
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datatypeDescriptor :: String -> String
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datatypeDescriptor "void" = "V"
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datatypeDescriptor "int" = "I"
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datatypeDescriptor "char" = "C"
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datatypeDescriptor "boolean" = "B"
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datatypeDescriptor x = "L" ++ x
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methodParameterDescriptor :: String -> String
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methodParameterDescriptor "void" = "V"
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methodParameterDescriptor "int" = "I"
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methodParameterDescriptor "char" = "C"
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methodParameterDescriptor "boolean" = "B"
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methodParameterDescriptor x = "L" ++ x ++ ";"
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memberInfoIsMethod :: [ConstantInfo] -> MemberInfo -> Bool
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memberInfoIsMethod constants info = elem '(' (memberInfoDescriptor constants info)
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findFieldIndex :: [ConstantInfo] -> String -> Maybe Int
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findFieldIndex constants name = let
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fieldRefNameInfos = [
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-- we only skip one entry to get the name since the Java constant pool
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-- is 1-indexed (why)
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(index, constants!!(fromIntegral index + 1))
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| (index, FieldRefInfo _ _) <- (zip [1..] constants)
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]
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fieldRefNames = map (\(index, nameInfo) -> case nameInfo of
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Utf8Info fieldName -> (index, fieldName)
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something_else -> error ("Expected UTF8Info but got" ++ show something_else))
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fieldRefNameInfos
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fieldIndex = find (\(index, fieldName) -> fieldName == name) fieldRefNames
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in case fieldIndex of
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Just (index, _) -> Just index
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Nothing -> Nothing
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findMethodIndex :: ClassFile -> String -> Maybe Int
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findMethodIndex classFile name = let
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constants = constantPool classFile
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in
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findIndex (\method -> ((memberInfoIsMethod constants method) && (memberInfoName constants method) == name)) (methods classFile)
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memberInfoDescriptor :: [ConstantInfo] -> MemberInfo -> String
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memberInfoDescriptor constants MemberInfo {
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memberAccessFlags = _,
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memberNameIndex = _,
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memberDescriptorIndex = descriptorIndex,
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memberAttributes = _ } = let
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descriptor = constants!!((fromIntegral descriptorIndex) - 1)
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in case descriptor of
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Utf8Info descriptorText -> descriptorText
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_ -> ("Invalid Item at Constant pool index " ++ show descriptorIndex)
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memberInfoName :: [ConstantInfo] -> MemberInfo -> String
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memberInfoName constants MemberInfo {
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memberAccessFlags = _,
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memberNameIndex = nameIndex,
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memberDescriptorIndex = _,
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memberAttributes = _ } = let
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name = constants!!((fromIntegral nameIndex) - 1)
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in case name of
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Utf8Info nameText -> nameText
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_ -> ("Invalid Item at Constant pool index " ++ show nameIndex)
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methodDescriptor :: MethodDeclaration -> String
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methodDescriptor (MethodDeclaration returntype _ parameters _) = let
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parameter_types = [datatype | ParameterDeclaration datatype _ <- parameters]
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in
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"("
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++ (concat (map methodParameterDescriptor parameter_types))
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++ ")"
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++ methodParameterDescriptor returntype
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injectDefaultConstructor :: [MethodDeclaration] -> [MethodDeclaration]
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injectDefaultConstructor pre
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| any (\(MethodDeclaration _ name _ _) -> name == "<init>") pre = pre
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| otherwise = pre ++ [MethodDeclaration "void" "<init>" [] (TypedStatement "void" (Block []))]
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classBuilder :: ClassFileBuilder Class
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classBuilder (Class name methods fields) _ = let
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baseConstants = [
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ClassInfo 4,
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MethodRefInfo 1 3,
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NameAndTypeInfo 5 6,
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Utf8Info "java/lang/Object",
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Utf8Info "<init>",
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Utf8Info "()V",
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Utf8Info "Code"
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]
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nameConstants = [ClassInfo 9, Utf8Info name]
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nakedClassFile = ClassFile {
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constantPool = baseConstants ++ nameConstants,
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accessFlags = accessPublic,
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thisClass = 8,
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superClass = 1,
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fields = [],
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methods = [],
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attributes = []
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}
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methodsWithInjectedConstructor = injectDefaultConstructor methods
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classFileWithFields = foldr fieldBuilder nakedClassFile fields
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classFileWithMethods = foldr methodBuilder classFileWithFields methodsWithInjectedConstructor
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classFileWithAssembledMethods = foldr methodAssembler classFileWithMethods methodsWithInjectedConstructor
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in
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classFileWithAssembledMethods
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fieldBuilder :: ClassFileBuilder VariableDeclaration
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fieldBuilder (VariableDeclaration datatype name _) input = let
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baseIndex = 1 + length (constantPool input)
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constants = [
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FieldRefInfo (fromIntegral (thisClass input)) (fromIntegral (baseIndex + 1)),
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NameAndTypeInfo (fromIntegral (baseIndex + 2)) (fromIntegral (baseIndex + 3)),
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Utf8Info name,
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Utf8Info (datatypeDescriptor datatype)
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]
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field = MemberInfo {
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memberAccessFlags = accessPublic,
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memberNameIndex = (fromIntegral (baseIndex + 2)),
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memberDescriptorIndex = (fromIntegral (baseIndex + 3)),
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memberAttributes = []
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}
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in
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input {
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constantPool = (constantPool input) ++ constants,
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fields = (fields input) ++ [field]
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}
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methodBuilder :: ClassFileBuilder MethodDeclaration
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methodBuilder (MethodDeclaration returntype name parameters statement) input = let
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baseIndex = 1 + length (constantPool input)
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constants = [
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Utf8Info name,
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Utf8Info (methodDescriptor (MethodDeclaration returntype name parameters (Block [])))
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]
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method = MemberInfo {
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memberAccessFlags = accessPublic,
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memberNameIndex = (fromIntegral baseIndex),
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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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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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methodAssembler (MethodDeclaration returntype name parameters statement) input = let
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methodConstantIndex = findMethodIndex input name
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in case methodConstantIndex of
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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, [], paramNames) declaration
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assembledMethod = method {
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memberAttributes = [
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CodeAttribute {
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attributeMaxStack = 420,
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attributeMaxLocals = 420,
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attributeCode = bytecode
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}
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]
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}
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in
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input {
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methods = pre ++ (assembledMethod : post)
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}
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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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| elem dtype ["int", "char", "boolean"] = Opireturn
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| otherwise = Opareturn
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binaryOperation :: BinaryOperator -> Operation
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binaryOperation Addition = Opiadd
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binaryOperation Subtraction = Opisub
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binaryOperation Multiplication = Opimul
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binaryOperation Division = Opidiv
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binaryOperation BitwiseAnd = Opiand
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binaryOperation BitwiseOr = Opior
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binaryOperation BitwiseXor = Opixor
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comparisonOperation :: BinaryOperator -> Word16 -> Operation
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comparisonOperation CompareEqual branchLocation = Opif_icmpeq branchLocation
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comparisonOperation CompareNotEqual branchLocation = Opif_icmpne branchLocation
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comparisonOperation CompareLessThan branchLocation = Opif_icmplt branchLocation
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comparisonOperation CompareLessOrEqual branchLocation = Opif_icmple branchLocation
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comparisonOperation CompareGreaterThan branchLocation = Opif_icmpgt branchLocation
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comparisonOperation CompareGreaterOrEqual branchLocation = Opif_icmpge branchLocation
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assembleMethod :: Assembler MethodDeclaration
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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, 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], lvars_a)
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| otherwise = let
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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, 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, 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, lvars) expr
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in
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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, lvars)
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assembleStatement (constants, ops, lvars) (TypedStatement _ (While expr stmt)) = let
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(constants_cmp, ops_cmp, _) = assembleExpression (constants, [], lvars) expr
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(constants_stmta, ops_stmta, _) = assembleStatement (constants_cmp, [], lvars) stmt
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-- +3 because we insert 2 gotos, one for the comparison, one for the goto back to the comparison
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stmt_length = sum (map opcodeEncodingLength ops_stmta) + 6
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entire_length = stmt_length + sum (map opcodeEncodingLength ops_cmp)
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in
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(constants_stmta, ops ++ ops_cmp ++ [Opsipush 0, Opif_icmpeq stmt_length] ++ ops_stmta ++ [Opgoto (-entire_length)], 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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storeLocal = if isPrimitive then [Opistore localIndex] else [Opastore localIndex]
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in
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(constants_init, ops_init ++ storeLocal, 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, 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, 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], lvars)
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| elem op [CompareEqual, CompareNotEqual, CompareLessThan, CompareLessOrEqual, CompareGreaterThan, CompareGreaterOrEqual] = let
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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, 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], 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], 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)], lvars)
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Nothing -> error ("No such field found in constant pool: " ++ name)
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assembleExpression (constants, ops, lvars) (TypedExpression dtype (LocalVariable name)) = let
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localIndex = findIndex ((==) name) lvars
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isPrimitive = elem dtype ["char", "boolean", "int"]
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in case localIndex of
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Just index -> (constants, ops ++ if isPrimitive then [Opiload (fromIntegral index)] else [Opaload (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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assembleStatementExpression :: Assembler StatementExpression
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assembleStatementExpression
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(constants, ops, lvars)
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(TypedStatementExpression _ (Assignment (TypedExpression dtype (LocalVariable name)) expr)) = let
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localIndex = findIndex ((==) name) lvars
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(constants_a, ops_a, _) = assembleExpression (constants, ops, lvars) expr
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isPrimitive = elem dtype ["char", "boolean", "int"]
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in case localIndex of
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Just index -> (constants_a, ops_a ++ if isPrimitive then [Opistore (fromIntegral index)] else [Opastore (fromIntegral index)], lvars)
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Nothing -> error ("No such local variable found in local variable pool: " ++ name)
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55
src/ByteCode/Generation/Assembler/Expression.hs
Normal file
55
src/ByteCode/Generation/Assembler/Expression.hs
Normal file
@ -0,0 +1,55 @@
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module ByteCode.Generation.Assembler.Expression where
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import Ast
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import ByteCode.ClassFile(ClassFile (..), ConstantInfo (..), MemberInfo(..), Operation(..), Attribute(..), opcodeEncodingLength)
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import ByteCode.Generation.Generator
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import Data.List
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import Data.Char
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import ByteCode.Generation.Builder.Field
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assembleExpression :: Assembler Expression
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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, 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], lvars)
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| elem op [CompareEqual, CompareNotEqual, CompareLessThan, CompareLessOrEqual, CompareGreaterThan, CompareGreaterOrEqual] = let
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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, 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
|
||||
newConstant = fromIntegral (1 + length exprConstants)
|
||||
in case etype of
|
||||
"int" -> (exprConstants ++ [IntegerInfo 0x7FFFFFFF], exprOps ++ [Opldc_w newConstant, Opixor], lvars)
|
||||
"char" -> (exprConstants, exprOps ++ [Opsipush 0xFFFF, Opixor], lvars)
|
||||
"boolean" -> (exprConstants, exprOps ++ [Opsipush 0x01, Opixor], lvars)
|
||||
assembleExpression (constants, ops, lvars) (TypedExpression _ (UnaryOperation Minus expr)) = let
|
||||
(exprConstants, exprOps, _) = assembleExpression (constants, ops, lvars) expr
|
||||
in
|
||||
(exprConstants, exprOps ++ [Opineg], lvars)
|
||||
assembleExpression (constants, ops, lvars) (TypedExpression _ (FieldVariable name)) = let
|
||||
fieldIndex = findFieldIndex constants name
|
||||
in case fieldIndex of
|
||||
Just index -> (constants, ops ++ [Opaload 0, Opgetfield (fromIntegral index)], lvars)
|
||||
Nothing -> error ("No such field found in constant pool: " ++ name)
|
||||
assembleExpression (constants, ops, lvars) (TypedExpression dtype (LocalVariable name)) = let
|
||||
localIndex = findIndex ((==) name) lvars
|
||||
isPrimitive = elem dtype ["char", "boolean", "int"]
|
||||
in case localIndex of
|
||||
Just index -> (constants, ops ++ if isPrimitive then [Opiload (fromIntegral index)] else [Opaload (fromIntegral index)], lvars)
|
||||
Nothing -> error ("No such local variable found in local variable pool: " ++ name)
|
||||
assembleExpression _ expr = error ("unimplemented: " ++ show expr)
|
||||
20
src/ByteCode/Generation/Assembler/Method.hs
Normal file
20
src/ByteCode/Generation/Assembler/Method.hs
Normal file
@ -0,0 +1,20 @@
|
||||
module ByteCode.Generation.Assembler.Method where
|
||||
|
||||
import Ast
|
||||
import ByteCode.ClassFile(ClassFile (..), ConstantInfo (..), MemberInfo(..), Operation(..), Attribute(..), opcodeEncodingLength)
|
||||
import ByteCode.Generation.Generator
|
||||
import ByteCode.Generation.Assembler.Statement
|
||||
|
||||
assembleMethod :: Assembler MethodDeclaration
|
||||
assembleMethod (constants, ops, lvars) (MethodDeclaration _ name _ (TypedStatement _ (Block statements)))
|
||||
| name == "<init>" = let
|
||||
(constants_a, ops_a, lvars_a) = foldl assembleStatement (constants, ops, lvars) statements
|
||||
init_ops = [Opaload 0, Opinvokespecial 2]
|
||||
in
|
||||
(constants_a, init_ops ++ ops_a ++ [Opreturn], lvars_a)
|
||||
| otherwise = let
|
||||
(constants_a, ops_a, lvars_a) = foldl assembleStatement (constants, ops, lvars) statements
|
||||
init_ops = [Opaload 0]
|
||||
in
|
||||
(constants_a, init_ops ++ ops_a, lvars_a)
|
||||
assembleMethod _ (MethodDeclaration _ _ _ stmt) = error ("Block expected for method body, got: " ++ show stmt)
|
||||
46
src/ByteCode/Generation/Assembler/Statement.hs
Normal file
46
src/ByteCode/Generation/Assembler/Statement.hs
Normal file
@ -0,0 +1,46 @@
|
||||
module ByteCode.Generation.Assembler.Statement where
|
||||
|
||||
import Ast
|
||||
import ByteCode.ClassFile(ClassFile (..), ConstantInfo (..), MemberInfo(..), Operation(..), Attribute(..), opcodeEncodingLength)
|
||||
import ByteCode.Generation.Generator
|
||||
import ByteCode.Generation.Assembler.Expression
|
||||
|
||||
assembleStatement :: Assembler Statement
|
||||
assembleStatement (constants, ops, lvars) (TypedStatement stype (Return expr)) = case expr of
|
||||
Nothing -> (constants, ops ++ [Opreturn], lvars)
|
||||
Just expr -> let
|
||||
(expr_constants, expr_ops, _) = assembleExpression (constants, ops, lvars) expr
|
||||
in
|
||||
(expr_constants, expr_ops ++ [returnOperation stype], lvars)
|
||||
assembleStatement (constants, ops, lvars) (TypedStatement _ (Block statements)) =
|
||||
foldl assembleStatement (constants, ops, lvars) statements
|
||||
assembleStatement (constants, ops, lvars) (TypedStatement _ (If expr if_stmt else_stmt)) = let
|
||||
(constants_cmp, ops_cmp, _) = assembleExpression (constants, [], lvars) expr
|
||||
(constants_ifa, ops_ifa, _) = assembleStatement (constants_cmp, [], lvars) if_stmt
|
||||
(constants_elsea, ops_elsea, _) = case else_stmt of
|
||||
Nothing -> (constants_ifa, [], lvars)
|
||||
Just stmt -> assembleStatement (constants_ifa, [], lvars) stmt
|
||||
-- +6 because we insert 2 gotos, one for if, one for else
|
||||
if_length = sum (map opcodeEncodingLength ops_ifa) + 6
|
||||
-- +3 because we need to account for the goto in the if statement.
|
||||
else_length = sum (map opcodeEncodingLength ops_elsea) + 3
|
||||
in
|
||||
(constants_ifa, ops ++ ops_cmp ++ [Opsipush 0, Opif_icmpeq if_length] ++ ops_ifa ++ [Opgoto else_length] ++ ops_elsea, lvars)
|
||||
assembleStatement (constants, ops, lvars) (TypedStatement _ (While expr stmt)) = let
|
||||
(constants_cmp, ops_cmp, _) = assembleExpression (constants, [], lvars) expr
|
||||
(constants_stmta, ops_stmta, _) = assembleStatement (constants_cmp, [], lvars) stmt
|
||||
-- +3 because we insert 2 gotos, one for the comparison, one for the goto back to the comparison
|
||||
stmt_length = sum (map opcodeEncodingLength ops_stmta) + 6
|
||||
entire_length = stmt_length + sum (map opcodeEncodingLength ops_cmp)
|
||||
in
|
||||
(constants_stmta, ops ++ ops_cmp ++ [Opsipush 0, Opif_icmpeq stmt_length] ++ ops_stmta ++ [Opgoto (-entire_length)], lvars)
|
||||
assembleStatement (constants, ops, lvars) (TypedStatement _ (LocalVariableDeclaration (VariableDeclaration dtype name expr))) = let
|
||||
isPrimitive = elem dtype ["char", "boolean", "int"]
|
||||
(constants_init, ops_init, _) = case expr of
|
||||
Just exp -> assembleExpression (constants, ops, lvars) exp
|
||||
Nothing -> (constants, ops ++ if isPrimitive then [Opsipush 0] else [Opaconst_null], lvars)
|
||||
localIndex = fromIntegral (length lvars)
|
||||
storeLocal = if isPrimitive then [Opistore localIndex] else [Opastore localIndex]
|
||||
in
|
||||
(constants_init, ops_init ++ storeLocal, lvars ++ [name])
|
||||
assembleStatement _ stmt = error ("Not yet implemented: " ++ show stmt)
|
||||
18
src/ByteCode/Generation/Assembler/StatementExpression.hs
Normal file
18
src/ByteCode/Generation/Assembler/StatementExpression.hs
Normal file
@ -0,0 +1,18 @@
|
||||
module ByteCode.Generation.Assembler.StatementExpression where
|
||||
|
||||
import Ast
|
||||
import ByteCode.ClassFile(ClassFile (..), ConstantInfo (..), MemberInfo(..), Operation(..), Attribute(..), opcodeEncodingLength)
|
||||
import ByteCode.Generation.Generator
|
||||
import Data.List
|
||||
import ByteCode.Generation.Assembler.Expression
|
||||
|
||||
assembleStatementExpression :: Assembler StatementExpression
|
||||
assembleStatementExpression
|
||||
(constants, ops, lvars)
|
||||
(TypedStatementExpression _ (Assignment (TypedExpression dtype (LocalVariable name)) expr)) = let
|
||||
localIndex = findIndex ((==) name) lvars
|
||||
(constants_a, ops_a, _) = assembleExpression (constants, ops, lvars) expr
|
||||
isPrimitive = elem dtype ["char", "boolean", "int"]
|
||||
in case localIndex of
|
||||
Just index -> (constants_a, ops_a ++ if isPrimitive then [Opistore (fromIntegral index)] else [Opastore (fromIntegral index)], lvars)
|
||||
Nothing -> error ("No such local variable found in local variable pool: " ++ name)
|
||||
44
src/ByteCode/Generation/Builder/Class.hs
Normal file
44
src/ByteCode/Generation/Builder/Class.hs
Normal file
@ -0,0 +1,44 @@
|
||||
module ByteCode.Generation.Builder.Class where
|
||||
|
||||
import ByteCode.Generation.Builder.Field
|
||||
import ByteCode.Generation.Builder.Method
|
||||
import ByteCode.Generation.Generator
|
||||
import Ast
|
||||
import ByteCode.ClassFile(ClassFile (..), ConstantInfo (..), MemberInfo(..), Operation(..), Attribute(..), opcodeEncodingLength)
|
||||
import ByteCode.Constants
|
||||
|
||||
injectDefaultConstructor :: [MethodDeclaration] -> [MethodDeclaration]
|
||||
injectDefaultConstructor pre
|
||||
| any (\(MethodDeclaration _ name _ _) -> name == "<init>") pre = pre
|
||||
| otherwise = pre ++ [MethodDeclaration "void" "<init>" [] (TypedStatement "void" (Block []))]
|
||||
|
||||
|
||||
classBuilder :: ClassFileBuilder Class
|
||||
classBuilder (Class name methods fields) _ = let
|
||||
baseConstants = [
|
||||
ClassInfo 4,
|
||||
MethodRefInfo 1 3,
|
||||
NameAndTypeInfo 5 6,
|
||||
Utf8Info "java/lang/Object",
|
||||
Utf8Info "<init>",
|
||||
Utf8Info "()V",
|
||||
Utf8Info "Code"
|
||||
]
|
||||
nameConstants = [ClassInfo 9, Utf8Info name]
|
||||
nakedClassFile = ClassFile {
|
||||
constantPool = baseConstants ++ nameConstants,
|
||||
accessFlags = accessPublic,
|
||||
thisClass = 8,
|
||||
superClass = 1,
|
||||
fields = [],
|
||||
methods = [],
|
||||
attributes = []
|
||||
}
|
||||
|
||||
methodsWithInjectedConstructor = injectDefaultConstructor methods
|
||||
|
||||
classFileWithFields = foldr fieldBuilder nakedClassFile fields
|
||||
classFileWithMethods = foldr methodBuilder classFileWithFields methodsWithInjectedConstructor
|
||||
classFileWithAssembledMethods = foldr methodAssembler classFileWithMethods methodsWithInjectedConstructor
|
||||
in
|
||||
classFileWithAssembledMethods
|
||||
46
src/ByteCode/Generation/Builder/Field.hs
Normal file
46
src/ByteCode/Generation/Builder/Field.hs
Normal file
@ -0,0 +1,46 @@
|
||||
module ByteCode.Generation.Builder.Field where
|
||||
|
||||
import Ast
|
||||
import ByteCode.ClassFile(ClassFile (..), ConstantInfo (..), MemberInfo(..), Operation(..), Attribute(..), opcodeEncodingLength)
|
||||
import ByteCode.Generation.Generator
|
||||
import ByteCode.Constants
|
||||
import Data.List
|
||||
|
||||
findFieldIndex :: [ConstantInfo] -> String -> Maybe Int
|
||||
findFieldIndex constants name = let
|
||||
fieldRefNameInfos = [
|
||||
-- we only skip one entry to get the name since the Java constant pool
|
||||
-- is 1-indexed (why)
|
||||
(index, constants!!(fromIntegral index + 1))
|
||||
| (index, FieldRefInfo _ _) <- (zip [1..] constants)
|
||||
]
|
||||
fieldRefNames = map (\(index, nameInfo) -> case nameInfo of
|
||||
Utf8Info fieldName -> (index, fieldName)
|
||||
something_else -> error ("Expected UTF8Info but got" ++ show something_else))
|
||||
fieldRefNameInfos
|
||||
fieldIndex = find (\(index, fieldName) -> fieldName == name) fieldRefNames
|
||||
in case fieldIndex of
|
||||
Just (index, _) -> Just index
|
||||
Nothing -> Nothing
|
||||
|
||||
|
||||
fieldBuilder :: ClassFileBuilder VariableDeclaration
|
||||
fieldBuilder (VariableDeclaration datatype name _) input = let
|
||||
baseIndex = 1 + length (constantPool input)
|
||||
constants = [
|
||||
FieldRefInfo (fromIntegral (thisClass input)) (fromIntegral (baseIndex + 1)),
|
||||
NameAndTypeInfo (fromIntegral (baseIndex + 2)) (fromIntegral (baseIndex + 3)),
|
||||
Utf8Info name,
|
||||
Utf8Info (datatypeDescriptor datatype)
|
||||
]
|
||||
field = MemberInfo {
|
||||
memberAccessFlags = accessPublic,
|
||||
memberNameIndex = (fromIntegral (baseIndex + 2)),
|
||||
memberDescriptorIndex = (fromIntegral (baseIndex + 3)),
|
||||
memberAttributes = []
|
||||
}
|
||||
in
|
||||
input {
|
||||
constantPool = (constantPool input) ++ constants,
|
||||
fields = (fields input) ++ [field]
|
||||
}
|
||||
80
src/ByteCode/Generation/Builder/Method.hs
Normal file
80
src/ByteCode/Generation/Builder/Method.hs
Normal file
@ -0,0 +1,80 @@
|
||||
module ByteCode.Generation.Builder.Method where
|
||||
|
||||
import Ast
|
||||
import ByteCode.ClassFile(ClassFile (..), ConstantInfo (..), MemberInfo(..), Operation(..), Attribute(..), opcodeEncodingLength)
|
||||
import ByteCode.Generation.Generator
|
||||
import ByteCode.Generation.Assembler.Method
|
||||
import ByteCode.Constants
|
||||
import Data.List
|
||||
|
||||
methodDescriptor :: MethodDeclaration -> String
|
||||
methodDescriptor (MethodDeclaration returntype _ parameters _) = let
|
||||
parameter_types = [datatype | ParameterDeclaration datatype _ <- parameters]
|
||||
in
|
||||
"("
|
||||
++ (concat (map methodParameterDescriptor parameter_types))
|
||||
++ ")"
|
||||
++ methodParameterDescriptor returntype
|
||||
|
||||
methodParameterDescriptor :: String -> String
|
||||
methodParameterDescriptor "void" = "V"
|
||||
methodParameterDescriptor "int" = "I"
|
||||
methodParameterDescriptor "char" = "C"
|
||||
methodParameterDescriptor "boolean" = "B"
|
||||
methodParameterDescriptor x = "L" ++ x ++ ";"
|
||||
|
||||
memberInfoIsMethod :: [ConstantInfo] -> MemberInfo -> Bool
|
||||
memberInfoIsMethod constants info = elem '(' (memberInfoDescriptor constants info)
|
||||
|
||||
findMethodIndex :: ClassFile -> String -> Maybe Int
|
||||
findMethodIndex classFile name = let
|
||||
constants = constantPool classFile
|
||||
in
|
||||
findIndex (\method -> ((memberInfoIsMethod constants method) && (memberInfoName constants method) == name)) (methods classFile)
|
||||
|
||||
|
||||
methodBuilder :: ClassFileBuilder MethodDeclaration
|
||||
methodBuilder (MethodDeclaration returntype name parameters statement) input = let
|
||||
baseIndex = 1 + length (constantPool input)
|
||||
constants = [
|
||||
Utf8Info name,
|
||||
Utf8Info (methodDescriptor (MethodDeclaration returntype name parameters (Block [])))
|
||||
]
|
||||
|
||||
method = MemberInfo {
|
||||
memberAccessFlags = accessPublic,
|
||||
memberNameIndex = (fromIntegral baseIndex),
|
||||
memberDescriptorIndex = (fromIntegral (baseIndex + 1)),
|
||||
memberAttributes = []
|
||||
}
|
||||
in
|
||||
input {
|
||||
constantPool = (constantPool input) ++ constants,
|
||||
methods = (methods input) ++ [method]
|
||||
}
|
||||
|
||||
|
||||
|
||||
methodAssembler :: ClassFileBuilder MethodDeclaration
|
||||
methodAssembler (MethodDeclaration returntype name parameters statement) input = let
|
||||
methodConstantIndex = findMethodIndex input name
|
||||
in case methodConstantIndex of
|
||||
Nothing -> error ("Cannot find method entry in method pool for method: " ++ name)
|
||||
Just index -> let
|
||||
declaration = MethodDeclaration returntype name parameters statement
|
||||
paramNames = "this" : [name | ParameterDeclaration _ name <- parameters]
|
||||
(pre, method : post) = splitAt index (methods input)
|
||||
(_, bytecode, _) = assembleMethod (constantPool input, [], paramNames) declaration
|
||||
assembledMethod = method {
|
||||
memberAttributes = [
|
||||
CodeAttribute {
|
||||
attributeMaxStack = 420,
|
||||
attributeMaxLocals = 420,
|
||||
attributeCode = bytecode
|
||||
}
|
||||
]
|
||||
}
|
||||
in
|
||||
input {
|
||||
methods = pre ++ (assembledMethod : post)
|
||||
}
|
||||
73
src/ByteCode/Generation/Generator.hs
Normal file
73
src/ByteCode/Generation/Generator.hs
Normal file
@ -0,0 +1,73 @@
|
||||
module ByteCode.Generation.Generator(
|
||||
datatypeDescriptor,
|
||||
memberInfoName,
|
||||
memberInfoDescriptor,
|
||||
returnOperation,
|
||||
binaryOperation,
|
||||
comparisonOperation,
|
||||
ClassFileBuilder,
|
||||
Assembler
|
||||
) where
|
||||
|
||||
import ByteCode.Constants
|
||||
import ByteCode.ClassFile (ClassFile (..), ConstantInfo (..), MemberInfo(..), Operation(..), Attribute(..), opcodeEncodingLength)
|
||||
import Ast
|
||||
import Data.Char
|
||||
import Data.List
|
||||
import Data.Word
|
||||
|
||||
type ClassFileBuilder a = a -> ClassFile -> ClassFile
|
||||
type Assembler a = ([ConstantInfo], [Operation], [String]) -> a -> ([ConstantInfo], [Operation], [String])
|
||||
|
||||
datatypeDescriptor :: String -> String
|
||||
datatypeDescriptor "void" = "V"
|
||||
datatypeDescriptor "int" = "I"
|
||||
datatypeDescriptor "char" = "C"
|
||||
datatypeDescriptor "boolean" = "B"
|
||||
datatypeDescriptor x = "L" ++ x
|
||||
|
||||
memberInfoDescriptor :: [ConstantInfo] -> MemberInfo -> String
|
||||
memberInfoDescriptor constants MemberInfo {
|
||||
memberAccessFlags = _,
|
||||
memberNameIndex = _,
|
||||
memberDescriptorIndex = descriptorIndex,
|
||||
memberAttributes = _ } = let
|
||||
descriptor = constants!!((fromIntegral descriptorIndex) - 1)
|
||||
in case descriptor of
|
||||
Utf8Info descriptorText -> descriptorText
|
||||
_ -> ("Invalid Item at Constant pool index " ++ show descriptorIndex)
|
||||
|
||||
|
||||
memberInfoName :: [ConstantInfo] -> MemberInfo -> String
|
||||
memberInfoName constants MemberInfo {
|
||||
memberAccessFlags = _,
|
||||
memberNameIndex = nameIndex,
|
||||
memberDescriptorIndex = _,
|
||||
memberAttributes = _ } = let
|
||||
name = constants!!((fromIntegral nameIndex) - 1)
|
||||
in case name of
|
||||
Utf8Info nameText -> nameText
|
||||
_ -> ("Invalid Item at Constant pool index " ++ show nameIndex)
|
||||
|
||||
|
||||
returnOperation :: DataType -> Operation
|
||||
returnOperation dtype
|
||||
| elem dtype ["int", "char", "boolean"] = Opireturn
|
||||
| otherwise = Opareturn
|
||||
|
||||
binaryOperation :: BinaryOperator -> Operation
|
||||
binaryOperation Addition = Opiadd
|
||||
binaryOperation Subtraction = Opisub
|
||||
binaryOperation Multiplication = Opimul
|
||||
binaryOperation Division = Opidiv
|
||||
binaryOperation BitwiseAnd = Opiand
|
||||
binaryOperation BitwiseOr = Opior
|
||||
binaryOperation BitwiseXor = Opixor
|
||||
|
||||
comparisonOperation :: BinaryOperator -> Word16 -> Operation
|
||||
comparisonOperation CompareEqual branchLocation = Opif_icmpeq branchLocation
|
||||
comparisonOperation CompareNotEqual branchLocation = Opif_icmpne branchLocation
|
||||
comparisonOperation CompareLessThan branchLocation = Opif_icmplt branchLocation
|
||||
comparisonOperation CompareLessOrEqual branchLocation = Opif_icmple branchLocation
|
||||
comparisonOperation CompareGreaterThan branchLocation = Opif_icmpgt branchLocation
|
||||
comparisonOperation CompareGreaterOrEqual branchLocation = Opif_icmpge branchLocation
|
||||
@ -4,7 +4,8 @@ import Example
|
||||
import Typecheck
|
||||
import Parser.Lexer (alexScanTokens)
|
||||
import Parser.JavaParser
|
||||
import ByteCode.ClassFile.Generator
|
||||
import ByteCode.Generation.Generator
|
||||
import ByteCode.Generation.Builder.Class
|
||||
import ByteCode.ClassFile
|
||||
import Data.ByteString (pack, writeFile)
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user