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package dotty.tools
package dotc
package core
package tasty
import collection.mutable
import Names.{Name, chrs, SimpleTermName, DerivedTermName}
import NameOps.NameDecorator
import NameExtractors._
import Decorators._
import TastyBuffer._
import scala.io.Codec
import TastyFormat._
class NameBuffer extends TastyBuffer(10000) {
import NameBuffer._
private val nameRefs = new mutable.LinkedHashMap[Name, NameRef]
def nameIndex(name: Name): NameRef = {
val name1 = name.toTermName
nameRefs.get(name1) match {
case Some(ref) =>
ref
case None =>
name1 match {
case SignedName(original, Signature(params, result)) =>
nameIndex(original); nameIndex(result); params.foreach(nameIndex)
case AnyQualifiedName(prefix, info) =>
nameIndex(prefix); nameIndex(info.name)
case DerivedTermName(prefix, _) =>
nameIndex(prefix)
case _ =>
}
val ref = NameRef(nameRefs.size)
nameRefs(name1) = ref
ref
}
}
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): Unit = writeNat(ref.index)
def writeNameRef(name: Name): Unit = writeNameRef(nameRefs(name.toTermName))
def pickleNameContents(name: Name): Unit = {
writeByte(name.toTermName.info.tag)
name.toTermName match {
case name: SimpleTermName =>
val bytes =
if (name.length == 0) new Array[Byte](0)
else Codec.toUTF8(chrs, name.start, name.length)
writeNat(bytes.length)
writeBytes(bytes, bytes.length)
case AnyQualifiedName(prefix, info) =>
withLength { writeNameRef(prefix); writeNameRef(info.name) }
case SignedName(original, Signature(params, result)) =>
withLength(
{ writeNameRef(original); writeNameRef(result); params.foreach(writeNameRef) },
if ((params.length + 2) * maxIndexWidth <= maxNumInByte) 1 else 2)
case DefaultGetterName(method, paramNumber) =>
withLength { writeNameRef(method); writeNat(paramNumber) }
case VariantName(original, sign) =>
withLength { writeNameRef(original); writeNat(sign + 1) }
case DerivedTermName(original, info) =>
withLength { writeNameRef(original) }
}
}
override def assemble(): Unit = {
var i = 0
for ((name, ref) <- nameRefs) {
assert(ref.index == i)
i += 1
pickleNameContents(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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