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/* NSC -- new Scala compiler
* Copyright 2005-2011 LAMP/EPFL
* @author Paul Phillips
*/
package scala.reflect.internal
import java.io.DataInput
import ConstantPool._
import ClassfileConstants._
trait ClassfileModel {
type Result
type Entry
type InterfaceInfo
type MemberInfo
type AttributeInfo
type InnerClassInfo
protected implicit def EntryArrayTag: ArrayTag[Entry]
protected implicit def InterfaceInfoArrayTag: ArrayTag[InterfaceInfo]
protected implicit def MemberInfoArrayTag: ArrayTag[MemberInfo]
protected implicit def AttributeInfoArrayTag: ArrayTag[AttributeInfo]
protected implicit def InnerClassInfoArrayTag: ArrayTag[InnerClassInfo]
// These could be implemented to jump forward in the stream if the
// result is not wanted.
def readConstantPoolEntry(): Entry
def readInterface(): InterfaceInfo
def readMember(): MemberInfo
def readAttribute(): AttributeInfo
def readInnerClass(): InnerClassInfo
def createInfo(
version: JvmVersion,
entries: Array[Entry],
flags: Int,
name: String,
superName: String,
interfaces: Array[InterfaceInfo],
fields: Array[MemberInfo],
methods: Array[MemberInfo],
attributes: Array[AttributeInfo]
): Result
}
abstract class StreamingClassfileModel extends ClassfileModel {
protected[this] val in: DataInput
private[this] var name: String = _
private[this] var entries: Array[PoolEntry] = _
type Entry = PoolEntry
// These translate null into "", it's less troublesome.
protected def nameAt(idx: Int) = entries(idx) match {
case x: Name_Info => stringAt(x.name_index).replace('/', '.')
case _ => ""
}
protected def stringAt(idx: Int) = entries(idx) match {
case x: Utf8_info => x.stringValue
case _ => ""
}
protected def u4 = in.readInt
protected def u2 = in.readUnsignedShort.toChar
protected def u1 = in.readUnsignedByte
// The constant_pool table is indexed from 1 to constant_pool_count−1.
protected def readConstantPool(): Array[Entry] = {
val count = u2
val entries = new Array[Entry](count)
var i = 1
while (i < count) {
val entry = readConstantPoolEntry()
entries(i) = entry
i += entry.width
}
entries
}
protected def readInterfaces() = {
val count = u2
val interfaces = new Array[InterfaceInfo](count)
var i = 0
while (i < count) {
interfaces(i) = readInterface()
i += 1
}
interfaces
}
protected def readMembers() = {
val count = u2
val arr = new Array[MemberInfo](count)
var i = 0
while (i < count) {
arr(i) = readMember()
i += 1
}
arr
}
protected def readAttributes(): Array[AttributeInfo] = {
val count = u2
val arr = new Array[AttributeInfo](count)
var i = 0
while (i < count) {
arr(i) = readAttribute()
i += 1
}
arr
}
protected def readInnerClasses() = {
val count = u2
val arr = new Array[InnerClassInfo](count)
var i = 0
while (i < count) {
arr(i) = readInnerClass()
i += 1
}
arr
}
protected def thisClass = name
def parse() = {
assert(u4 == JAVA_MAGIC, "Bad magic number")
val version = JvmVersion(u2, u2)
this.entries = readConstantPool()
val flags = u2.toShort
this.name = nameAt(u2)
val superName = nameAt(u2)
val interfaces = readInterfaces()
val fields = readMembers()
val methods = readMembers()
val attributes = readAttributes()
try createInfo(version, entries, flags, name, superName, interfaces, fields, methods, attributes)
finally entries = null
}
}
abstract class ScalacClassfileModel extends StreamingClassfileModel {
type Result = JvmClassInfo
type InterfaceInfo = String
type MemberInfo = JvmMemberInfo
type AttributeInfo = JvmAttributeInfo
type InnerClassInfo = JvmInnerClassInfo
protected implicit def EntryArrayTag = arrayTag[PoolEntry]
protected implicit def InterfaceInfoArrayTag = arrayTag[InterfaceInfo]
protected implicit def MemberInfoArrayTag = arrayTag[MemberInfo]
protected implicit def AttributeInfoArrayTag = arrayTag[AttributeInfo]
protected implicit def InnerClassInfoArrayTag = arrayTag[InnerClassInfo]
def readConstantPoolEntry(): PoolEntry
def readInterface(): String
def readMember(): JvmMemberInfo
def readAttribute(): JvmAttributeInfo
def readInnerClass(): JvmInnerClassInfo
def createInfo(
version: JvmVersion,
entries: Array[PoolEntry],
flags: Int,
name: String,
superName: String,
interfaces: Array[String],
fields: Array[JvmMemberInfo],
methods: Array[JvmMemberInfo],
attributes: Array[JvmAttributeInfo]
): JvmClassInfo = new JvmClassInfo(name, superName, interfaces, fields, methods, attributes)
}
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