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package dotty.tools
package dotc
package core
package tasty
import collection.mutable
import Names.{Name, chrs}
import Decorators._, NameOps._
import TastyBuffer._
import scala.io.Codec
import TastyName._
import TastyFormat._
class NameBuffer extends TastyBuffer(10000) {
import NameBuffer._
private val nameRefs = new mutable.LinkedHashMap[TastyName, NameRef]
def nameIndex(name: TastyName): NameRef = nameRefs.get(name) match {
case Some(ref) =>
ref
case None =>
val ref = NameRef(nameRefs.size)
nameRefs(name) = ref
ref
}
def nameIndex(name: Name): NameRef = {
val tname =
if (name.isShadowedName) Shadowed(nameIndex(name.revertShadowed))
else Simple(name.toTermName)
nameIndex(tname)
}
def nameIndex(str: String): NameRef = nameIndex(str.toTermName)
def fullNameIndex(name: Name): NameRef = {
val pos = name.lastIndexOf('.')
if (pos > 0)
nameIndex(Qualified(fullNameIndex(name.take(pos)), nameIndex(name.drop(pos + 1))))
else
nameIndex(name)
}
private def withLength(op: => Unit, lengthWidth: Int = 1): Unit = {
val lengthAddr = currentAddr
for (i <- 0 until lengthWidth) writeByte(0)
op
val length = currentAddr.index - lengthAddr.index - 1
putNat(lengthAddr, length, lengthWidth)
}
def writeNameRef(ref: NameRef) = writeNat(ref.index)
def pickleName(name: TastyName): Unit = name match {
case Simple(name) =>
val bytes =
if (name.length == 0) new Array[Byte](0)
else Codec.toUTF8(chrs, name.start, name.length)
writeByte(UTF8)
writeNat(bytes.length)
writeBytes(bytes, bytes.length)
case Qualified(qualified, selector) =>
writeByte(QUALIFIED)
withLength { writeNameRef(qualified); writeNameRef(selector) }
case Signed(original, params, result) =>
writeByte(SIGNED)
withLength(
{ writeNameRef(original); writeNameRef(result); params.foreach(writeNameRef) },
if ((params.length + 2) * maxIndexWidth <= maxNumInByte) 1 else 2)
case Expanded(prefix, original) =>
writeByte(EXPANDED)
withLength { writeNameRef(prefix); writeNameRef(original) }
case ModuleClass(module) =>
writeByte(OBJECTCLASS)
withLength { writeNameRef(module) }
case SuperAccessor(accessed) =>
writeByte(SUPERACCESSOR)
withLength { writeNameRef(accessed) }
case DefaultGetter(method, paramNumber) =>
writeByte(DEFAULTGETTER)
withLength { writeNameRef(method); writeNat(paramNumber) }
case Shadowed(original) =>
writeByte(SHADOWED)
withLength { writeNameRef(original) }
}
override def assemble(): Unit = {
var i = 0
for ((name, ref) <- nameRefs) {
assert(ref.index == i)
i += 1
pickleName(name)
}
}
}
object NameBuffer {
private val maxIndexWidth = 3 // allows name indices up to 2^21.
private val payloadBitsPerByte = 7 // determined by nat encoding in TastyBuffer
private val maxNumInByte = (1 << payloadBitsPerByte) - 1
}
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