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package org.json4s.scalap
package scalasig
import language.postfixOps
import java.io.IOException
object ByteCode {
def apply(bytes: Array[Byte]) = new ByteCode(bytes, 0, bytes.length)
def forClass(clazz: Class[_]) = {
val name = clazz.getName
val subPath = name.substring(name.lastIndexOf('.') + 1) + ".class"
val in = clazz.getResourceAsStream(subPath)
try {
var rest = in.available()
val bytes = new Array[Byte](rest)
while (rest > 0) {
val res = in.read(bytes, bytes.length - rest, rest)
if (res == -1) throw new IOException("read error")
rest -= res
}
ByteCode(bytes)
} finally {
in.close()
}
}
}
/** Represents a chunk of raw bytecode. Used as input for the parsers
*/
class ByteCode(val bytes: Array[Byte], val pos: Int, val length: Int) {
assert(pos >= 0 && length >= 0 && pos + length <= bytes.length)
def nextByte = if (length == 0) Failure else Success(drop(1), bytes(pos))
def next(n: Int) = if (length >= n) Success(drop(n), take(n)) else Failure
def take(n: Int) = new ByteCode(bytes, pos, n)
def drop(n: Int) = new ByteCode(bytes, pos + n, length - n)
def fold[X](x: X)(f: (X, Byte) => X): X = {
var result = x
var i = pos
while (i < pos + length) {
result = f(result, bytes(i))
i += 1
}
result
}
override def toString = length + " bytes"
def toInt = fold(0) { (x, b) => (x << 8) + (b & 0xFF)}
def toLong = fold(0L) { (x, b) => (x << 8) + (b & 0xFF)}
/**
* Transforms array subsequence of the current buffer into the UTF8 String and
* stores and array of bytes for the decompiler
*/
def fromUTF8StringAndBytes = {
val chunk: Array[Byte] = new Array[Byte](length)
System.arraycopy(bytes, pos, chunk, 0, length)
val str = new String(io.Codec.fromUTF8(bytes, pos, length))
StringBytesPair(str, chunk)
}
def byte(i: Int) = bytes(pos) & 0xFF
}
/**
* The wrapper for decode UTF-8 string
*/
case class StringBytesPair(string: String, bytes: Array[Byte])
/** Provides rules for parsing byte-code.
*/
trait ByteCodeReader extends RulesWithState {
type S = ByteCode
type Parser[A] = Rule[A, String]
val byte = apply(_ nextByte)
val u1 = byte ^^ (_ & 0xFF)
val u2 = bytes(2) ^^ (_ toInt)
val u4 = bytes(4) ^^ (_ toInt) // should map to Long??
def bytes(n: Int) = apply(_ next n)
}
object ClassFileParser extends ByteCodeReader {
def parse(byteCode: ByteCode) = expect(classFile)(byteCode)
def parseAnnotations(byteCode: ByteCode) = expect(annotations)(byteCode)
val magicNumber = (u4 filter (_ == 0xCAFEBABE)) | error("Not a valid class file")
val version = u2 ~ u2 ^^ { case minor ~ major => (major, minor) }
val constantPool = (u2 ^^ ConstantPool) >> repeatUntil(constantPoolEntry)(_ isFull)
// NOTE currently most constants just evaluate to a string description
// TODO evaluate to useful values
val utf8String = (u2 >> bytes) ^^ add1 { raw => pool => raw.fromUTF8StringAndBytes }
val intConstant = u4 ^^ add1 { x => pool => x }
val floatConstant = bytes(4) ^^ add1 { raw => pool => "Float: TODO" }
val longConstant = bytes(8) ^^ add2 { raw => pool => raw.toLong }
val doubleConstant = bytes(8) ^^ add2 { raw => pool => "Double: TODO" }
val classRef = u2 ^^ add1 { x => pool => "Class: " + pool(x) }
val stringRef = u2 ^^ add1 { x => pool => "String: " + pool(x) }
val fieldRef = memberRef("Field")
val methodRef = memberRef("Method")
val interfaceMethodRef = memberRef("InterfaceMethod")
val nameAndType = u2 ~ u2 ^^ add1 { case name ~ descriptor => pool => "NameAndType: " + pool(name) + ", " + pool(descriptor) }
val methodHandle = u1 ~ u2 ^^ add1 { case referenceKind ~ referenceIndex => pool => "MethodHandle: " + referenceKind + ", " + pool(referenceIndex) }
val methodType = u2 ^^ add1 { case descriptorIndex => pool => "MethodType: " + pool(descriptorIndex) }
val invokeDynamic = u2 ~ u2 ^^ add1 { case bootstrapMethodAttrIndex ~ nameAndTypeIndex => pool => "InvokeDynamic: " + "bootstrapMethodAttrIndex = " + bootstrapMethodAttrIndex + ", " + pool(nameAndTypeIndex) }
val constantPoolEntry = u1 >> {
case 1 => utf8String
case 3 => intConstant
case 4 => floatConstant
case 5 => longConstant
case 6 => doubleConstant
case 7 => classRef
case 8 => stringRef
case 9 => fieldRef
case 10 => methodRef
case 11 => interfaceMethodRef
case 12 => nameAndType
case 15 => methodHandle
case 16 => methodType
case 18 => invokeDynamic
}
val interfaces = u2 >> u2.times
// bytes are parametrizes by the length, declared in u4 section
val attribute = u2 ~ (u4 >> bytes) ^~^ Attribute
// parse attributes u2 times
val attributes = u2 >> attribute.times
// parse runtime-visible annotations
abstract class ElementValue
case class AnnotationElement(elementNameIndex: Int, elementValue: ElementValue)
case class ConstValueIndex(index: Int) extends ElementValue
case class EnumConstValue(typeNameIndex: Int, constNameIndex: Int) extends ElementValue
case class ClassInfoIndex(index: Int) extends ElementValue
case class Annotation(typeIndex: Int, elementValuePairs: Seq[AnnotationElement]) extends ElementValue
case class ArrayValue(values: Seq[ElementValue]) extends ElementValue
def element_value: Parser[ElementValue] = u1 >> {
case 'B'|'C'|'D'|'F'|'I'|'J'|'S'|'Z'|'s' => u2 ^^ ConstValueIndex
case 'e' => u2 ~ u2 ^~^ EnumConstValue
case 'c' => u2 ^^ ClassInfoIndex
case '@' => annotation //nested annotation
case '[' => u2 >> element_value.times ^^ ArrayValue
}
val element_value_pair = u2 ~ element_value ^~^ AnnotationElement
val annotation: Parser[Annotation] = u2 ~ (u2 >> element_value_pair.times) ^~^ Annotation
val annotations = u2 >> annotation.times
val field = u2 ~ u2 ~ u2 ~ attributes ^~~~^ Field
val fields = u2 >> field.times
val method = u2 ~ u2 ~ u2 ~ attributes ^~~~^ Method
val methods = u2 >> method.times
val header = magicNumber -~ u2 ~ u2 ~ constantPool ~ u2 ~ u2 ~ u2 ~ interfaces ^~~~~~~^ ClassFileHeader
val classFile = header ~ fields ~ methods ~ attributes ~- !u1 ^~~~^ ClassFile
// TODO create a useful object, not just a string
def memberRef(description: String) = u2 ~ u2 ^^ add1 {
case classRef ~ nameAndTypeRef => pool => description + ": " + pool(classRef) + ", " + pool(nameAndTypeRef)
}
def add1[T](f: T => ConstantPool => Any)(raw: T)(pool: ConstantPool) = pool add f(raw)
def add2[T](f: T => ConstantPool => Any)(raw: T)(pool: ConstantPool) = pool add f(raw) add { pool => "" }
}
case class ClassFile(
header: ClassFileHeader,
fields: Seq[Field],
methods: Seq[Method],
attributes: Seq[Attribute]) {
def majorVersion = header.major
def minorVersion = header.minor
def className = constant(header.classIndex)
def superClass = constant(header.superClassIndex)
def interfaces = header.interfaces.map(constant)
def constant(index: Int) = header.constants(index) match {
case StringBytesPair(str, _) => str
case z => z
}
def constantWrapped(index: Int) = header.constants(index)
def attribute(name: String) = attributes.find {attrib => constant(attrib.nameIndex) == name }
val RUNTIME_VISIBLE_ANNOTATIONS = "RuntimeVisibleAnnotations"
def annotations = (attributes.find(attr => constant(attr.nameIndex) == RUNTIME_VISIBLE_ANNOTATIONS)
.map(attr => ClassFileParser.parseAnnotations(attr.byteCode)))
def annotation(name: String) = annotations.flatMap(seq => seq.find(annot => constant(annot.typeIndex) == name))
}
case class Attribute(nameIndex: Int, byteCode: ByteCode)
case class Field(flags: Int, nameIndex: Int, descriptorIndex: Int, attributes: Seq[Attribute])
case class Method(flags: Int, nameIndex: Int, descriptorIndex: Int, attributes: Seq[Attribute])
case class ClassFileHeader(
minor: Int,
major: Int,
constants: ConstantPool,
flags: Int,
classIndex: Int,
superClassIndex: Int,
interfaces: Seq[Int]) {
def constant(index: Int) = constants(index)
}
case class ConstantPool(len: Int) {
val size = len - 1
private val buffer = new scala.collection.mutable.ArrayBuffer[ConstantPool => Any]
private val values = Array.fill[Option[Any]](size)(None)
def isFull = buffer.length >= size
def apply(index: Int) = {
// Note constant pool indices are 1-based
val i = index - 1
values(i) getOrElse {
val value = buffer(i)(this)
buffer(i) = null
values(i) = Some(value)
value
}
}
def add(f: ConstantPool => Any) = {
buffer += f
this
}
}
